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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/mm/page_alloc.c | |
4 | * | |
5 | * Manages the free list, the system allocates free pages here. | |
6 | * Note that kmalloc() lives in slab.c | |
7 | * | |
8 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
9 | * Swap reorganised 29.12.95, Stephen Tweedie | |
10 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
11 | * Reshaped it to be a zoned allocator, Ingo Molnar, Red Hat, 1999 | |
12 | * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999 | |
13 | * Zone balancing, Kanoj Sarcar, SGI, Jan 2000 | |
14 | * Per cpu hot/cold page lists, bulk allocation, Martin J. Bligh, Sept 2002 | |
15 | * (lots of bits borrowed from Ingo Molnar & Andrew Morton) | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/stddef.h> |
19 | #include <linux/mm.h> | |
ca79b0c2 | 20 | #include <linux/highmem.h> |
1da177e4 LT |
21 | #include <linux/swap.h> |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/pagemap.h> | |
10ed273f | 24 | #include <linux/jiffies.h> |
edbe7d23 | 25 | #include <linux/memblock.h> |
1da177e4 | 26 | #include <linux/compiler.h> |
9f158333 | 27 | #include <linux/kernel.h> |
b8c73fc2 | 28 | #include <linux/kasan.h> |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | #include <linux/suspend.h> | |
31 | #include <linux/pagevec.h> | |
32 | #include <linux/blkdev.h> | |
33 | #include <linux/slab.h> | |
a238ab5b | 34 | #include <linux/ratelimit.h> |
5a3135c2 | 35 | #include <linux/oom.h> |
1da177e4 LT |
36 | #include <linux/topology.h> |
37 | #include <linux/sysctl.h> | |
38 | #include <linux/cpu.h> | |
39 | #include <linux/cpuset.h> | |
bdc8cb98 | 40 | #include <linux/memory_hotplug.h> |
1da177e4 LT |
41 | #include <linux/nodemask.h> |
42 | #include <linux/vmalloc.h> | |
a6cccdc3 | 43 | #include <linux/vmstat.h> |
4be38e35 | 44 | #include <linux/mempolicy.h> |
4b94ffdc | 45 | #include <linux/memremap.h> |
6811378e | 46 | #include <linux/stop_machine.h> |
97500a4a | 47 | #include <linux/random.h> |
c713216d MG |
48 | #include <linux/sort.h> |
49 | #include <linux/pfn.h> | |
3fcfab16 | 50 | #include <linux/backing-dev.h> |
933e312e | 51 | #include <linux/fault-inject.h> |
a5d76b54 | 52 | #include <linux/page-isolation.h> |
3ac7fe5a | 53 | #include <linux/debugobjects.h> |
dbb1f81c | 54 | #include <linux/kmemleak.h> |
56de7263 | 55 | #include <linux/compaction.h> |
0d3d062a | 56 | #include <trace/events/kmem.h> |
d379f01d | 57 | #include <trace/events/oom.h> |
268bb0ce | 58 | #include <linux/prefetch.h> |
6e543d57 | 59 | #include <linux/mm_inline.h> |
f920e413 | 60 | #include <linux/mmu_notifier.h> |
041d3a8c | 61 | #include <linux/migrate.h> |
949f7ec5 | 62 | #include <linux/hugetlb.h> |
8bd75c77 | 63 | #include <linux/sched/rt.h> |
5b3cc15a | 64 | #include <linux/sched/mm.h> |
48c96a36 | 65 | #include <linux/page_owner.h> |
0e1cc95b | 66 | #include <linux/kthread.h> |
4949148a | 67 | #include <linux/memcontrol.h> |
42c269c8 | 68 | #include <linux/ftrace.h> |
d92a8cfc | 69 | #include <linux/lockdep.h> |
556b969a | 70 | #include <linux/nmi.h> |
eb414681 | 71 | #include <linux/psi.h> |
e4443149 | 72 | #include <linux/padata.h> |
4aab2be0 | 73 | #include <linux/khugepaged.h> |
ba8f3587 | 74 | #include <linux/buffer_head.h> |
1da177e4 | 75 | |
7ee3d4e8 | 76 | #include <asm/sections.h> |
1da177e4 | 77 | #include <asm/tlbflush.h> |
ac924c60 | 78 | #include <asm/div64.h> |
1da177e4 | 79 | #include "internal.h" |
e900a918 | 80 | #include "shuffle.h" |
36e66c55 | 81 | #include "page_reporting.h" |
1da177e4 | 82 | |
f04a5d5d DH |
83 | /* Free Page Internal flags: for internal, non-pcp variants of free_pages(). */ |
84 | typedef int __bitwise fpi_t; | |
85 | ||
86 | /* No special request */ | |
87 | #define FPI_NONE ((__force fpi_t)0) | |
88 | ||
89 | /* | |
90 | * Skip free page reporting notification for the (possibly merged) page. | |
91 | * This does not hinder free page reporting from grabbing the page, | |
92 | * reporting it and marking it "reported" - it only skips notifying | |
93 | * the free page reporting infrastructure about a newly freed page. For | |
94 | * example, used when temporarily pulling a page from a freelist and | |
95 | * putting it back unmodified. | |
96 | */ | |
97 | #define FPI_SKIP_REPORT_NOTIFY ((__force fpi_t)BIT(0)) | |
98 | ||
47b6a24a DH |
99 | /* |
100 | * Place the (possibly merged) page to the tail of the freelist. Will ignore | |
101 | * page shuffling (relevant code - e.g., memory onlining - is expected to | |
102 | * shuffle the whole zone). | |
103 | * | |
104 | * Note: No code should rely on this flag for correctness - it's purely | |
105 | * to allow for optimizations when handing back either fresh pages | |
106 | * (memory onlining) or untouched pages (page isolation, free page | |
107 | * reporting). | |
108 | */ | |
109 | #define FPI_TO_TAIL ((__force fpi_t)BIT(1)) | |
110 | ||
c8e251fa CS |
111 | /* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */ |
112 | static DEFINE_MUTEX(pcp_batch_high_lock); | |
7cd2b0a3 | 113 | #define MIN_PERCPU_PAGELIST_FRACTION (8) |
c8e251fa | 114 | |
72812019 LS |
115 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
116 | DEFINE_PER_CPU(int, numa_node); | |
117 | EXPORT_PER_CPU_SYMBOL(numa_node); | |
118 | #endif | |
119 | ||
4518085e KW |
120 | DEFINE_STATIC_KEY_TRUE(vm_numa_stat_key); |
121 | ||
7aac7898 LS |
122 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
123 | /* | |
124 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. | |
125 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. | |
126 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem() | |
127 | * defined in <linux/topology.h>. | |
128 | */ | |
129 | DEFINE_PER_CPU(int, _numa_mem_); /* Kernel "local memory" node */ | |
130 | EXPORT_PER_CPU_SYMBOL(_numa_mem_); | |
131 | #endif | |
132 | ||
bd233f53 | 133 | /* work_structs for global per-cpu drains */ |
d9367bd0 WY |
134 | struct pcpu_drain { |
135 | struct zone *zone; | |
136 | struct work_struct work; | |
137 | }; | |
8b885f53 JY |
138 | static DEFINE_MUTEX(pcpu_drain_mutex); |
139 | static DEFINE_PER_CPU(struct pcpu_drain, pcpu_drain); | |
bd233f53 | 140 | |
38addce8 | 141 | #ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY |
58bea414 | 142 | volatile unsigned long latent_entropy __latent_entropy; |
38addce8 ER |
143 | EXPORT_SYMBOL(latent_entropy); |
144 | #endif | |
145 | ||
1da177e4 | 146 | /* |
13808910 | 147 | * Array of node states. |
1da177e4 | 148 | */ |
13808910 CL |
149 | nodemask_t node_states[NR_NODE_STATES] __read_mostly = { |
150 | [N_POSSIBLE] = NODE_MASK_ALL, | |
151 | [N_ONLINE] = { { [0] = 1UL } }, | |
152 | #ifndef CONFIG_NUMA | |
153 | [N_NORMAL_MEMORY] = { { [0] = 1UL } }, | |
154 | #ifdef CONFIG_HIGHMEM | |
155 | [N_HIGH_MEMORY] = { { [0] = 1UL } }, | |
20b2f52b | 156 | #endif |
20b2f52b | 157 | [N_MEMORY] = { { [0] = 1UL } }, |
13808910 CL |
158 | [N_CPU] = { { [0] = 1UL } }, |
159 | #endif /* NUMA */ | |
160 | }; | |
161 | EXPORT_SYMBOL(node_states); | |
162 | ||
ca79b0c2 AK |
163 | atomic_long_t _totalram_pages __read_mostly; |
164 | EXPORT_SYMBOL(_totalram_pages); | |
cb45b0e9 | 165 | unsigned long totalreserve_pages __read_mostly; |
e48322ab | 166 | unsigned long totalcma_pages __read_mostly; |
ab8fabd4 | 167 | |
1b76b02f | 168 | int percpu_pagelist_fraction; |
dcce284a | 169 | gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK; |
6471384a | 170 | DEFINE_STATIC_KEY_FALSE(init_on_alloc); |
6471384a AP |
171 | EXPORT_SYMBOL(init_on_alloc); |
172 | ||
6471384a | 173 | DEFINE_STATIC_KEY_FALSE(init_on_free); |
6471384a AP |
174 | EXPORT_SYMBOL(init_on_free); |
175 | ||
04013513 VB |
176 | static bool _init_on_alloc_enabled_early __read_mostly |
177 | = IS_ENABLED(CONFIG_INIT_ON_ALLOC_DEFAULT_ON); | |
6471384a AP |
178 | static int __init early_init_on_alloc(char *buf) |
179 | { | |
6471384a | 180 | |
04013513 | 181 | return kstrtobool(buf, &_init_on_alloc_enabled_early); |
6471384a AP |
182 | } |
183 | early_param("init_on_alloc", early_init_on_alloc); | |
184 | ||
04013513 VB |
185 | static bool _init_on_free_enabled_early __read_mostly |
186 | = IS_ENABLED(CONFIG_INIT_ON_FREE_DEFAULT_ON); | |
6471384a AP |
187 | static int __init early_init_on_free(char *buf) |
188 | { | |
04013513 | 189 | return kstrtobool(buf, &_init_on_free_enabled_early); |
6471384a AP |
190 | } |
191 | early_param("init_on_free", early_init_on_free); | |
1da177e4 | 192 | |
bb14c2c7 VB |
193 | /* |
194 | * A cached value of the page's pageblock's migratetype, used when the page is | |
195 | * put on a pcplist. Used to avoid the pageblock migratetype lookup when | |
196 | * freeing from pcplists in most cases, at the cost of possibly becoming stale. | |
197 | * Also the migratetype set in the page does not necessarily match the pcplist | |
198 | * index, e.g. page might have MIGRATE_CMA set but be on a pcplist with any | |
199 | * other index - this ensures that it will be put on the correct CMA freelist. | |
200 | */ | |
201 | static inline int get_pcppage_migratetype(struct page *page) | |
202 | { | |
203 | return page->index; | |
204 | } | |
205 | ||
206 | static inline void set_pcppage_migratetype(struct page *page, int migratetype) | |
207 | { | |
208 | page->index = migratetype; | |
209 | } | |
210 | ||
452aa699 RW |
211 | #ifdef CONFIG_PM_SLEEP |
212 | /* | |
213 | * The following functions are used by the suspend/hibernate code to temporarily | |
214 | * change gfp_allowed_mask in order to avoid using I/O during memory allocations | |
215 | * while devices are suspended. To avoid races with the suspend/hibernate code, | |
55f2503c PL |
216 | * they should always be called with system_transition_mutex held |
217 | * (gfp_allowed_mask also should only be modified with system_transition_mutex | |
218 | * held, unless the suspend/hibernate code is guaranteed not to run in parallel | |
219 | * with that modification). | |
452aa699 | 220 | */ |
c9e664f1 RW |
221 | |
222 | static gfp_t saved_gfp_mask; | |
223 | ||
224 | void pm_restore_gfp_mask(void) | |
452aa699 | 225 | { |
55f2503c | 226 | WARN_ON(!mutex_is_locked(&system_transition_mutex)); |
c9e664f1 RW |
227 | if (saved_gfp_mask) { |
228 | gfp_allowed_mask = saved_gfp_mask; | |
229 | saved_gfp_mask = 0; | |
230 | } | |
452aa699 RW |
231 | } |
232 | ||
c9e664f1 | 233 | void pm_restrict_gfp_mask(void) |
452aa699 | 234 | { |
55f2503c | 235 | WARN_ON(!mutex_is_locked(&system_transition_mutex)); |
c9e664f1 RW |
236 | WARN_ON(saved_gfp_mask); |
237 | saved_gfp_mask = gfp_allowed_mask; | |
d0164adc | 238 | gfp_allowed_mask &= ~(__GFP_IO | __GFP_FS); |
452aa699 | 239 | } |
f90ac398 MG |
240 | |
241 | bool pm_suspended_storage(void) | |
242 | { | |
d0164adc | 243 | if ((gfp_allowed_mask & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS)) |
f90ac398 MG |
244 | return false; |
245 | return true; | |
246 | } | |
452aa699 RW |
247 | #endif /* CONFIG_PM_SLEEP */ |
248 | ||
d9c23400 | 249 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
d00181b9 | 250 | unsigned int pageblock_order __read_mostly; |
d9c23400 MG |
251 | #endif |
252 | ||
7fef431b DH |
253 | static void __free_pages_ok(struct page *page, unsigned int order, |
254 | fpi_t fpi_flags); | |
a226f6c8 | 255 | |
1da177e4 LT |
256 | /* |
257 | * results with 256, 32 in the lowmem_reserve sysctl: | |
258 | * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high) | |
259 | * 1G machine -> (16M dma, 784M normal, 224M high) | |
260 | * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA | |
261 | * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL | |
84109e15 | 262 | * HIGHMEM allocation will leave (224M+784M)/256 of ram reserved in ZONE_DMA |
a2f1b424 AK |
263 | * |
264 | * TBD: should special case ZONE_DMA32 machines here - in those we normally | |
265 | * don't need any ZONE_NORMAL reservation | |
1da177e4 | 266 | */ |
d3cda233 | 267 | int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES] = { |
4b51d669 | 268 | #ifdef CONFIG_ZONE_DMA |
d3cda233 | 269 | [ZONE_DMA] = 256, |
4b51d669 | 270 | #endif |
fb0e7942 | 271 | #ifdef CONFIG_ZONE_DMA32 |
d3cda233 | 272 | [ZONE_DMA32] = 256, |
fb0e7942 | 273 | #endif |
d3cda233 | 274 | [ZONE_NORMAL] = 32, |
e53ef38d | 275 | #ifdef CONFIG_HIGHMEM |
d3cda233 | 276 | [ZONE_HIGHMEM] = 0, |
e53ef38d | 277 | #endif |
d3cda233 | 278 | [ZONE_MOVABLE] = 0, |
2f1b6248 | 279 | }; |
1da177e4 | 280 | |
15ad7cdc | 281 | static char * const zone_names[MAX_NR_ZONES] = { |
4b51d669 | 282 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 283 | "DMA", |
4b51d669 | 284 | #endif |
fb0e7942 | 285 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 286 | "DMA32", |
fb0e7942 | 287 | #endif |
2f1b6248 | 288 | "Normal", |
e53ef38d | 289 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 290 | "HighMem", |
e53ef38d | 291 | #endif |
2a1e274a | 292 | "Movable", |
033fbae9 DW |
293 | #ifdef CONFIG_ZONE_DEVICE |
294 | "Device", | |
295 | #endif | |
2f1b6248 CL |
296 | }; |
297 | ||
c999fbd3 | 298 | const char * const migratetype_names[MIGRATE_TYPES] = { |
60f30350 VB |
299 | "Unmovable", |
300 | "Movable", | |
301 | "Reclaimable", | |
302 | "HighAtomic", | |
303 | #ifdef CONFIG_CMA | |
304 | "CMA", | |
305 | #endif | |
306 | #ifdef CONFIG_MEMORY_ISOLATION | |
307 | "Isolate", | |
308 | #endif | |
309 | }; | |
310 | ||
ae70eddd AK |
311 | compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS] = { |
312 | [NULL_COMPOUND_DTOR] = NULL, | |
313 | [COMPOUND_PAGE_DTOR] = free_compound_page, | |
f1e61557 | 314 | #ifdef CONFIG_HUGETLB_PAGE |
ae70eddd | 315 | [HUGETLB_PAGE_DTOR] = free_huge_page, |
f1e61557 | 316 | #endif |
9a982250 | 317 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
ae70eddd | 318 | [TRANSHUGE_PAGE_DTOR] = free_transhuge_page, |
9a982250 | 319 | #endif |
f1e61557 KS |
320 | }; |
321 | ||
1da177e4 | 322 | int min_free_kbytes = 1024; |
42aa83cb | 323 | int user_min_free_kbytes = -1; |
24512228 | 324 | int watermark_boost_factor __read_mostly; |
795ae7a0 | 325 | int watermark_scale_factor = 10; |
1da177e4 | 326 | |
bbe5d993 OS |
327 | static unsigned long nr_kernel_pages __initdata; |
328 | static unsigned long nr_all_pages __initdata; | |
329 | static unsigned long dma_reserve __initdata; | |
1da177e4 | 330 | |
bbe5d993 OS |
331 | static unsigned long arch_zone_lowest_possible_pfn[MAX_NR_ZONES] __initdata; |
332 | static unsigned long arch_zone_highest_possible_pfn[MAX_NR_ZONES] __initdata; | |
7f16f91f | 333 | static unsigned long required_kernelcore __initdata; |
a5c6d650 | 334 | static unsigned long required_kernelcore_percent __initdata; |
7f16f91f | 335 | static unsigned long required_movablecore __initdata; |
a5c6d650 | 336 | static unsigned long required_movablecore_percent __initdata; |
bbe5d993 | 337 | static unsigned long zone_movable_pfn[MAX_NUMNODES] __initdata; |
7f16f91f | 338 | static bool mirrored_kernelcore __meminitdata; |
0ee332c1 TH |
339 | |
340 | /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ | |
341 | int movable_zone; | |
342 | EXPORT_SYMBOL(movable_zone); | |
c713216d | 343 | |
418508c1 | 344 | #if MAX_NUMNODES > 1 |
b9726c26 | 345 | unsigned int nr_node_ids __read_mostly = MAX_NUMNODES; |
ce0725f7 | 346 | unsigned int nr_online_nodes __read_mostly = 1; |
418508c1 | 347 | EXPORT_SYMBOL(nr_node_ids); |
62bc62a8 | 348 | EXPORT_SYMBOL(nr_online_nodes); |
418508c1 MS |
349 | #endif |
350 | ||
9ef9acb0 MG |
351 | int page_group_by_mobility_disabled __read_mostly; |
352 | ||
3a80a7fa | 353 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
3c0c12cc WL |
354 | /* |
355 | * During boot we initialize deferred pages on-demand, as needed, but once | |
356 | * page_alloc_init_late() has finished, the deferred pages are all initialized, | |
357 | * and we can permanently disable that path. | |
358 | */ | |
359 | static DEFINE_STATIC_KEY_TRUE(deferred_pages); | |
360 | ||
361 | /* | |
362 | * Calling kasan_free_pages() only after deferred memory initialization | |
363 | * has completed. Poisoning pages during deferred memory init will greatly | |
364 | * lengthen the process and cause problem in large memory systems as the | |
365 | * deferred pages initialization is done with interrupt disabled. | |
366 | * | |
367 | * Assuming that there will be no reference to those newly initialized | |
368 | * pages before they are ever allocated, this should have no effect on | |
369 | * KASAN memory tracking as the poison will be properly inserted at page | |
370 | * allocation time. The only corner case is when pages are allocated by | |
371 | * on-demand allocation and then freed again before the deferred pages | |
372 | * initialization is done, but this is not likely to happen. | |
373 | */ | |
374 | static inline void kasan_free_nondeferred_pages(struct page *page, int order) | |
375 | { | |
376 | if (!static_branch_unlikely(&deferred_pages)) | |
377 | kasan_free_pages(page, order); | |
378 | } | |
379 | ||
3a80a7fa | 380 | /* Returns true if the struct page for the pfn is uninitialised */ |
0e1cc95b | 381 | static inline bool __meminit early_page_uninitialised(unsigned long pfn) |
3a80a7fa | 382 | { |
ef70b6f4 MG |
383 | int nid = early_pfn_to_nid(pfn); |
384 | ||
385 | if (node_online(nid) && pfn >= NODE_DATA(nid)->first_deferred_pfn) | |
3a80a7fa MG |
386 | return true; |
387 | ||
388 | return false; | |
389 | } | |
390 | ||
391 | /* | |
d3035be4 | 392 | * Returns true when the remaining initialisation should be deferred until |
3a80a7fa MG |
393 | * later in the boot cycle when it can be parallelised. |
394 | */ | |
d3035be4 PT |
395 | static bool __meminit |
396 | defer_init(int nid, unsigned long pfn, unsigned long end_pfn) | |
3a80a7fa | 397 | { |
d3035be4 PT |
398 | static unsigned long prev_end_pfn, nr_initialised; |
399 | ||
400 | /* | |
401 | * prev_end_pfn static that contains the end of previous zone | |
402 | * No need to protect because called very early in boot before smp_init. | |
403 | */ | |
404 | if (prev_end_pfn != end_pfn) { | |
405 | prev_end_pfn = end_pfn; | |
406 | nr_initialised = 0; | |
407 | } | |
408 | ||
3c2c6488 | 409 | /* Always populate low zones for address-constrained allocations */ |
d3035be4 | 410 | if (end_pfn < pgdat_end_pfn(NODE_DATA(nid))) |
3a80a7fa | 411 | return false; |
23b68cfa | 412 | |
dc2da7b4 BH |
413 | if (NODE_DATA(nid)->first_deferred_pfn != ULONG_MAX) |
414 | return true; | |
23b68cfa WY |
415 | /* |
416 | * We start only with one section of pages, more pages are added as | |
417 | * needed until the rest of deferred pages are initialized. | |
418 | */ | |
d3035be4 | 419 | nr_initialised++; |
23b68cfa | 420 | if ((nr_initialised > PAGES_PER_SECTION) && |
d3035be4 PT |
421 | (pfn & (PAGES_PER_SECTION - 1)) == 0) { |
422 | NODE_DATA(nid)->first_deferred_pfn = pfn; | |
423 | return true; | |
3a80a7fa | 424 | } |
d3035be4 | 425 | return false; |
3a80a7fa MG |
426 | } |
427 | #else | |
3c0c12cc WL |
428 | #define kasan_free_nondeferred_pages(p, o) kasan_free_pages(p, o) |
429 | ||
3a80a7fa MG |
430 | static inline bool early_page_uninitialised(unsigned long pfn) |
431 | { | |
432 | return false; | |
433 | } | |
434 | ||
d3035be4 | 435 | static inline bool defer_init(int nid, unsigned long pfn, unsigned long end_pfn) |
3a80a7fa | 436 | { |
d3035be4 | 437 | return false; |
3a80a7fa MG |
438 | } |
439 | #endif | |
440 | ||
0b423ca2 MG |
441 | /* Return a pointer to the bitmap storing bits affecting a block of pages */ |
442 | static inline unsigned long *get_pageblock_bitmap(struct page *page, | |
443 | unsigned long pfn) | |
444 | { | |
445 | #ifdef CONFIG_SPARSEMEM | |
f1eca35a | 446 | return section_to_usemap(__pfn_to_section(pfn)); |
0b423ca2 MG |
447 | #else |
448 | return page_zone(page)->pageblock_flags; | |
449 | #endif /* CONFIG_SPARSEMEM */ | |
450 | } | |
451 | ||
452 | static inline int pfn_to_bitidx(struct page *page, unsigned long pfn) | |
453 | { | |
454 | #ifdef CONFIG_SPARSEMEM | |
455 | pfn &= (PAGES_PER_SECTION-1); | |
0b423ca2 MG |
456 | #else |
457 | pfn = pfn - round_down(page_zone(page)->zone_start_pfn, pageblock_nr_pages); | |
0b423ca2 | 458 | #endif /* CONFIG_SPARSEMEM */ |
399b795b | 459 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
0b423ca2 MG |
460 | } |
461 | ||
535b81e2 WY |
462 | static __always_inline |
463 | unsigned long __get_pfnblock_flags_mask(struct page *page, | |
0b423ca2 | 464 | unsigned long pfn, |
0b423ca2 MG |
465 | unsigned long mask) |
466 | { | |
467 | unsigned long *bitmap; | |
468 | unsigned long bitidx, word_bitidx; | |
469 | unsigned long word; | |
470 | ||
471 | bitmap = get_pageblock_bitmap(page, pfn); | |
472 | bitidx = pfn_to_bitidx(page, pfn); | |
473 | word_bitidx = bitidx / BITS_PER_LONG; | |
474 | bitidx &= (BITS_PER_LONG-1); | |
475 | ||
476 | word = bitmap[word_bitidx]; | |
d93d5ab9 | 477 | return (word >> bitidx) & mask; |
0b423ca2 MG |
478 | } |
479 | ||
a00cda3f MCC |
480 | /** |
481 | * get_pfnblock_flags_mask - Return the requested group of flags for the pageblock_nr_pages block of pages | |
482 | * @page: The page within the block of interest | |
483 | * @pfn: The target page frame number | |
484 | * @mask: mask of bits that the caller is interested in | |
485 | * | |
486 | * Return: pageblock_bits flags | |
487 | */ | |
0b423ca2 | 488 | unsigned long get_pfnblock_flags_mask(struct page *page, unsigned long pfn, |
0b423ca2 MG |
489 | unsigned long mask) |
490 | { | |
535b81e2 | 491 | return __get_pfnblock_flags_mask(page, pfn, mask); |
0b423ca2 MG |
492 | } |
493 | ||
494 | static __always_inline int get_pfnblock_migratetype(struct page *page, unsigned long pfn) | |
495 | { | |
535b81e2 | 496 | return __get_pfnblock_flags_mask(page, pfn, MIGRATETYPE_MASK); |
0b423ca2 MG |
497 | } |
498 | ||
499 | /** | |
500 | * set_pfnblock_flags_mask - Set the requested group of flags for a pageblock_nr_pages block of pages | |
501 | * @page: The page within the block of interest | |
502 | * @flags: The flags to set | |
503 | * @pfn: The target page frame number | |
0b423ca2 MG |
504 | * @mask: mask of bits that the caller is interested in |
505 | */ | |
506 | void set_pfnblock_flags_mask(struct page *page, unsigned long flags, | |
507 | unsigned long pfn, | |
0b423ca2 MG |
508 | unsigned long mask) |
509 | { | |
510 | unsigned long *bitmap; | |
511 | unsigned long bitidx, word_bitidx; | |
512 | unsigned long old_word, word; | |
513 | ||
514 | BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4); | |
125b860b | 515 | BUILD_BUG_ON(MIGRATE_TYPES > (1 << PB_migratetype_bits)); |
0b423ca2 MG |
516 | |
517 | bitmap = get_pageblock_bitmap(page, pfn); | |
518 | bitidx = pfn_to_bitidx(page, pfn); | |
519 | word_bitidx = bitidx / BITS_PER_LONG; | |
520 | bitidx &= (BITS_PER_LONG-1); | |
521 | ||
522 | VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn), page); | |
523 | ||
d93d5ab9 WY |
524 | mask <<= bitidx; |
525 | flags <<= bitidx; | |
0b423ca2 MG |
526 | |
527 | word = READ_ONCE(bitmap[word_bitidx]); | |
528 | for (;;) { | |
529 | old_word = cmpxchg(&bitmap[word_bitidx], word, (word & ~mask) | flags); | |
530 | if (word == old_word) | |
531 | break; | |
532 | word = old_word; | |
533 | } | |
534 | } | |
3a80a7fa | 535 | |
ee6f509c | 536 | void set_pageblock_migratetype(struct page *page, int migratetype) |
b2a0ac88 | 537 | { |
5d0f3f72 KM |
538 | if (unlikely(page_group_by_mobility_disabled && |
539 | migratetype < MIGRATE_PCPTYPES)) | |
49255c61 MG |
540 | migratetype = MIGRATE_UNMOVABLE; |
541 | ||
d93d5ab9 | 542 | set_pfnblock_flags_mask(page, (unsigned long)migratetype, |
535b81e2 | 543 | page_to_pfn(page), MIGRATETYPE_MASK); |
b2a0ac88 MG |
544 | } |
545 | ||
13e7444b | 546 | #ifdef CONFIG_DEBUG_VM |
c6a57e19 | 547 | static int page_outside_zone_boundaries(struct zone *zone, struct page *page) |
1da177e4 | 548 | { |
bdc8cb98 DH |
549 | int ret = 0; |
550 | unsigned seq; | |
551 | unsigned long pfn = page_to_pfn(page); | |
b5e6a5a2 | 552 | unsigned long sp, start_pfn; |
c6a57e19 | 553 | |
bdc8cb98 DH |
554 | do { |
555 | seq = zone_span_seqbegin(zone); | |
b5e6a5a2 CS |
556 | start_pfn = zone->zone_start_pfn; |
557 | sp = zone->spanned_pages; | |
108bcc96 | 558 | if (!zone_spans_pfn(zone, pfn)) |
bdc8cb98 DH |
559 | ret = 1; |
560 | } while (zone_span_seqretry(zone, seq)); | |
561 | ||
b5e6a5a2 | 562 | if (ret) |
613813e8 DH |
563 | pr_err("page 0x%lx outside node %d zone %s [ 0x%lx - 0x%lx ]\n", |
564 | pfn, zone_to_nid(zone), zone->name, | |
565 | start_pfn, start_pfn + sp); | |
b5e6a5a2 | 566 | |
bdc8cb98 | 567 | return ret; |
c6a57e19 DH |
568 | } |
569 | ||
570 | static int page_is_consistent(struct zone *zone, struct page *page) | |
571 | { | |
14e07298 | 572 | if (!pfn_valid_within(page_to_pfn(page))) |
c6a57e19 | 573 | return 0; |
1da177e4 | 574 | if (zone != page_zone(page)) |
c6a57e19 DH |
575 | return 0; |
576 | ||
577 | return 1; | |
578 | } | |
579 | /* | |
580 | * Temporary debugging check for pages not lying within a given zone. | |
581 | */ | |
d73d3c9f | 582 | static int __maybe_unused bad_range(struct zone *zone, struct page *page) |
c6a57e19 DH |
583 | { |
584 | if (page_outside_zone_boundaries(zone, page)) | |
1da177e4 | 585 | return 1; |
c6a57e19 DH |
586 | if (!page_is_consistent(zone, page)) |
587 | return 1; | |
588 | ||
1da177e4 LT |
589 | return 0; |
590 | } | |
13e7444b | 591 | #else |
d73d3c9f | 592 | static inline int __maybe_unused bad_range(struct zone *zone, struct page *page) |
13e7444b NP |
593 | { |
594 | return 0; | |
595 | } | |
596 | #endif | |
597 | ||
82a3241a | 598 | static void bad_page(struct page *page, const char *reason) |
1da177e4 | 599 | { |
d936cf9b HD |
600 | static unsigned long resume; |
601 | static unsigned long nr_shown; | |
602 | static unsigned long nr_unshown; | |
603 | ||
604 | /* | |
605 | * Allow a burst of 60 reports, then keep quiet for that minute; | |
606 | * or allow a steady drip of one report per second. | |
607 | */ | |
608 | if (nr_shown == 60) { | |
609 | if (time_before(jiffies, resume)) { | |
610 | nr_unshown++; | |
611 | goto out; | |
612 | } | |
613 | if (nr_unshown) { | |
ff8e8116 | 614 | pr_alert( |
1e9e6365 | 615 | "BUG: Bad page state: %lu messages suppressed\n", |
d936cf9b HD |
616 | nr_unshown); |
617 | nr_unshown = 0; | |
618 | } | |
619 | nr_shown = 0; | |
620 | } | |
621 | if (nr_shown++ == 0) | |
622 | resume = jiffies + 60 * HZ; | |
623 | ||
ff8e8116 | 624 | pr_alert("BUG: Bad page state in process %s pfn:%05lx\n", |
3dc14741 | 625 | current->comm, page_to_pfn(page)); |
ff8e8116 | 626 | __dump_page(page, reason); |
4e462112 | 627 | dump_page_owner(page); |
3dc14741 | 628 | |
4f31888c | 629 | print_modules(); |
1da177e4 | 630 | dump_stack(); |
d936cf9b | 631 | out: |
8cc3b392 | 632 | /* Leave bad fields for debug, except PageBuddy could make trouble */ |
22b751c3 | 633 | page_mapcount_reset(page); /* remove PageBuddy */ |
373d4d09 | 634 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
635 | } |
636 | ||
1da177e4 LT |
637 | /* |
638 | * Higher-order pages are called "compound pages". They are structured thusly: | |
639 | * | |
1d798ca3 | 640 | * The first PAGE_SIZE page is called the "head page" and have PG_head set. |
1da177e4 | 641 | * |
1d798ca3 KS |
642 | * The remaining PAGE_SIZE pages are called "tail pages". PageTail() is encoded |
643 | * in bit 0 of page->compound_head. The rest of bits is pointer to head page. | |
1da177e4 | 644 | * |
1d798ca3 KS |
645 | * The first tail page's ->compound_dtor holds the offset in array of compound |
646 | * page destructors. See compound_page_dtors. | |
1da177e4 | 647 | * |
1d798ca3 | 648 | * The first tail page's ->compound_order holds the order of allocation. |
41d78ba5 | 649 | * This usage means that zero-order pages may not be compound. |
1da177e4 | 650 | */ |
d98c7a09 | 651 | |
9a982250 | 652 | void free_compound_page(struct page *page) |
d98c7a09 | 653 | { |
7ae88534 | 654 | mem_cgroup_uncharge(page); |
7fef431b | 655 | __free_pages_ok(page, compound_order(page), FPI_NONE); |
d98c7a09 HD |
656 | } |
657 | ||
d00181b9 | 658 | void prep_compound_page(struct page *page, unsigned int order) |
18229df5 AW |
659 | { |
660 | int i; | |
661 | int nr_pages = 1 << order; | |
662 | ||
18229df5 AW |
663 | __SetPageHead(page); |
664 | for (i = 1; i < nr_pages; i++) { | |
665 | struct page *p = page + i; | |
58a84aa9 | 666 | set_page_count(p, 0); |
1c290f64 | 667 | p->mapping = TAIL_MAPPING; |
1d798ca3 | 668 | set_compound_head(p, page); |
18229df5 | 669 | } |
1378a5ee MWO |
670 | |
671 | set_compound_page_dtor(page, COMPOUND_PAGE_DTOR); | |
672 | set_compound_order(page, order); | |
53f9263b | 673 | atomic_set(compound_mapcount_ptr(page), -1); |
47e29d32 JH |
674 | if (hpage_pincount_available(page)) |
675 | atomic_set(compound_pincount_ptr(page), 0); | |
18229df5 AW |
676 | } |
677 | ||
c0a32fc5 SG |
678 | #ifdef CONFIG_DEBUG_PAGEALLOC |
679 | unsigned int _debug_guardpage_minorder; | |
96a2b03f | 680 | |
8e57f8ac VB |
681 | bool _debug_pagealloc_enabled_early __read_mostly |
682 | = IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT); | |
683 | EXPORT_SYMBOL(_debug_pagealloc_enabled_early); | |
96a2b03f | 684 | DEFINE_STATIC_KEY_FALSE(_debug_pagealloc_enabled); |
505f6d22 | 685 | EXPORT_SYMBOL(_debug_pagealloc_enabled); |
96a2b03f VB |
686 | |
687 | DEFINE_STATIC_KEY_FALSE(_debug_guardpage_enabled); | |
e30825f1 | 688 | |
031bc574 JK |
689 | static int __init early_debug_pagealloc(char *buf) |
690 | { | |
8e57f8ac | 691 | return kstrtobool(buf, &_debug_pagealloc_enabled_early); |
031bc574 JK |
692 | } |
693 | early_param("debug_pagealloc", early_debug_pagealloc); | |
694 | ||
c0a32fc5 SG |
695 | static int __init debug_guardpage_minorder_setup(char *buf) |
696 | { | |
697 | unsigned long res; | |
698 | ||
699 | if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) { | |
1170532b | 700 | pr_err("Bad debug_guardpage_minorder value\n"); |
c0a32fc5 SG |
701 | return 0; |
702 | } | |
703 | _debug_guardpage_minorder = res; | |
1170532b | 704 | pr_info("Setting debug_guardpage_minorder to %lu\n", res); |
c0a32fc5 SG |
705 | return 0; |
706 | } | |
f1c1e9f7 | 707 | early_param("debug_guardpage_minorder", debug_guardpage_minorder_setup); |
c0a32fc5 | 708 | |
acbc15a4 | 709 | static inline bool set_page_guard(struct zone *zone, struct page *page, |
2847cf95 | 710 | unsigned int order, int migratetype) |
c0a32fc5 | 711 | { |
e30825f1 | 712 | if (!debug_guardpage_enabled()) |
acbc15a4 JK |
713 | return false; |
714 | ||
715 | if (order >= debug_guardpage_minorder()) | |
716 | return false; | |
e30825f1 | 717 | |
3972f6bb | 718 | __SetPageGuard(page); |
2847cf95 JK |
719 | INIT_LIST_HEAD(&page->lru); |
720 | set_page_private(page, order); | |
721 | /* Guard pages are not available for any usage */ | |
722 | __mod_zone_freepage_state(zone, -(1 << order), migratetype); | |
acbc15a4 JK |
723 | |
724 | return true; | |
c0a32fc5 SG |
725 | } |
726 | ||
2847cf95 JK |
727 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
728 | unsigned int order, int migratetype) | |
c0a32fc5 | 729 | { |
e30825f1 JK |
730 | if (!debug_guardpage_enabled()) |
731 | return; | |
732 | ||
3972f6bb | 733 | __ClearPageGuard(page); |
e30825f1 | 734 | |
2847cf95 JK |
735 | set_page_private(page, 0); |
736 | if (!is_migrate_isolate(migratetype)) | |
737 | __mod_zone_freepage_state(zone, (1 << order), migratetype); | |
c0a32fc5 SG |
738 | } |
739 | #else | |
acbc15a4 JK |
740 | static inline bool set_page_guard(struct zone *zone, struct page *page, |
741 | unsigned int order, int migratetype) { return false; } | |
2847cf95 JK |
742 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
743 | unsigned int order, int migratetype) {} | |
c0a32fc5 SG |
744 | #endif |
745 | ||
04013513 VB |
746 | /* |
747 | * Enable static keys related to various memory debugging and hardening options. | |
748 | * Some override others, and depend on early params that are evaluated in the | |
749 | * order of appearance. So we need to first gather the full picture of what was | |
750 | * enabled, and then make decisions. | |
751 | */ | |
752 | void init_mem_debugging_and_hardening(void) | |
753 | { | |
3f1bc543 ST |
754 | bool page_poisoning_requested = false; |
755 | ||
756 | #ifdef CONFIG_PAGE_POISONING | |
757 | /* | |
758 | * Page poisoning is debug page alloc for some arches. If | |
759 | * either of those options are enabled, enable poisoning. | |
760 | */ | |
761 | if (page_poisoning_enabled() || | |
762 | (!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) && | |
763 | debug_pagealloc_enabled())) { | |
764 | static_branch_enable(&_page_poisoning_enabled); | |
765 | page_poisoning_requested = true; | |
766 | } | |
767 | #endif | |
768 | ||
04013513 | 769 | if (_init_on_alloc_enabled_early) { |
3f1bc543 | 770 | if (page_poisoning_requested) |
04013513 VB |
771 | pr_info("mem auto-init: CONFIG_PAGE_POISONING is on, " |
772 | "will take precedence over init_on_alloc\n"); | |
773 | else | |
774 | static_branch_enable(&init_on_alloc); | |
775 | } | |
776 | if (_init_on_free_enabled_early) { | |
3f1bc543 | 777 | if (page_poisoning_requested) |
04013513 VB |
778 | pr_info("mem auto-init: CONFIG_PAGE_POISONING is on, " |
779 | "will take precedence over init_on_free\n"); | |
780 | else | |
781 | static_branch_enable(&init_on_free); | |
782 | } | |
783 | ||
784 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
785 | if (!debug_pagealloc_enabled()) | |
786 | return; | |
787 | ||
788 | static_branch_enable(&_debug_pagealloc_enabled); | |
789 | ||
790 | if (!debug_guardpage_minorder()) | |
791 | return; | |
792 | ||
793 | static_branch_enable(&_debug_guardpage_enabled); | |
794 | #endif | |
795 | } | |
796 | ||
ab130f91 | 797 | static inline void set_buddy_order(struct page *page, unsigned int order) |
6aa3001b | 798 | { |
4c21e2f2 | 799 | set_page_private(page, order); |
676165a8 | 800 | __SetPageBuddy(page); |
1da177e4 LT |
801 | } |
802 | ||
1da177e4 LT |
803 | /* |
804 | * This function checks whether a page is free && is the buddy | |
6e292b9b | 805 | * we can coalesce a page and its buddy if |
13ad59df | 806 | * (a) the buddy is not in a hole (check before calling!) && |
676165a8 | 807 | * (b) the buddy is in the buddy system && |
cb2b95e1 AW |
808 | * (c) a page and its buddy have the same order && |
809 | * (d) a page and its buddy are in the same zone. | |
676165a8 | 810 | * |
6e292b9b MW |
811 | * For recording whether a page is in the buddy system, we set PageBuddy. |
812 | * Setting, clearing, and testing PageBuddy is serialized by zone->lock. | |
1da177e4 | 813 | * |
676165a8 | 814 | * For recording page's order, we use page_private(page). |
1da177e4 | 815 | */ |
fe925c0c | 816 | static inline bool page_is_buddy(struct page *page, struct page *buddy, |
7aeb09f9 | 817 | unsigned int order) |
1da177e4 | 818 | { |
fe925c0c | 819 | if (!page_is_guard(buddy) && !PageBuddy(buddy)) |
820 | return false; | |
4c5018ce | 821 | |
ab130f91 | 822 | if (buddy_order(buddy) != order) |
fe925c0c | 823 | return false; |
c0a32fc5 | 824 | |
fe925c0c | 825 | /* |
826 | * zone check is done late to avoid uselessly calculating | |
827 | * zone/node ids for pages that could never merge. | |
828 | */ | |
829 | if (page_zone_id(page) != page_zone_id(buddy)) | |
830 | return false; | |
d34c5fa0 | 831 | |
fe925c0c | 832 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); |
4c5018ce | 833 | |
fe925c0c | 834 | return true; |
1da177e4 LT |
835 | } |
836 | ||
5e1f0f09 MG |
837 | #ifdef CONFIG_COMPACTION |
838 | static inline struct capture_control *task_capc(struct zone *zone) | |
839 | { | |
840 | struct capture_control *capc = current->capture_control; | |
841 | ||
deba0487 | 842 | return unlikely(capc) && |
5e1f0f09 MG |
843 | !(current->flags & PF_KTHREAD) && |
844 | !capc->page && | |
deba0487 | 845 | capc->cc->zone == zone ? capc : NULL; |
5e1f0f09 MG |
846 | } |
847 | ||
848 | static inline bool | |
849 | compaction_capture(struct capture_control *capc, struct page *page, | |
850 | int order, int migratetype) | |
851 | { | |
852 | if (!capc || order != capc->cc->order) | |
853 | return false; | |
854 | ||
855 | /* Do not accidentally pollute CMA or isolated regions*/ | |
856 | if (is_migrate_cma(migratetype) || | |
857 | is_migrate_isolate(migratetype)) | |
858 | return false; | |
859 | ||
860 | /* | |
861 | * Do not let lower order allocations polluate a movable pageblock. | |
862 | * This might let an unmovable request use a reclaimable pageblock | |
863 | * and vice-versa but no more than normal fallback logic which can | |
864 | * have trouble finding a high-order free page. | |
865 | */ | |
866 | if (order < pageblock_order && migratetype == MIGRATE_MOVABLE) | |
867 | return false; | |
868 | ||
869 | capc->page = page; | |
870 | return true; | |
871 | } | |
872 | ||
873 | #else | |
874 | static inline struct capture_control *task_capc(struct zone *zone) | |
875 | { | |
876 | return NULL; | |
877 | } | |
878 | ||
879 | static inline bool | |
880 | compaction_capture(struct capture_control *capc, struct page *page, | |
881 | int order, int migratetype) | |
882 | { | |
883 | return false; | |
884 | } | |
885 | #endif /* CONFIG_COMPACTION */ | |
886 | ||
6ab01363 AD |
887 | /* Used for pages not on another list */ |
888 | static inline void add_to_free_list(struct page *page, struct zone *zone, | |
889 | unsigned int order, int migratetype) | |
890 | { | |
891 | struct free_area *area = &zone->free_area[order]; | |
892 | ||
893 | list_add(&page->lru, &area->free_list[migratetype]); | |
894 | area->nr_free++; | |
895 | } | |
896 | ||
897 | /* Used for pages not on another list */ | |
898 | static inline void add_to_free_list_tail(struct page *page, struct zone *zone, | |
899 | unsigned int order, int migratetype) | |
900 | { | |
901 | struct free_area *area = &zone->free_area[order]; | |
902 | ||
903 | list_add_tail(&page->lru, &area->free_list[migratetype]); | |
904 | area->nr_free++; | |
905 | } | |
906 | ||
293ffa5e DH |
907 | /* |
908 | * Used for pages which are on another list. Move the pages to the tail | |
909 | * of the list - so the moved pages won't immediately be considered for | |
910 | * allocation again (e.g., optimization for memory onlining). | |
911 | */ | |
6ab01363 AD |
912 | static inline void move_to_free_list(struct page *page, struct zone *zone, |
913 | unsigned int order, int migratetype) | |
914 | { | |
915 | struct free_area *area = &zone->free_area[order]; | |
916 | ||
293ffa5e | 917 | list_move_tail(&page->lru, &area->free_list[migratetype]); |
6ab01363 AD |
918 | } |
919 | ||
920 | static inline void del_page_from_free_list(struct page *page, struct zone *zone, | |
921 | unsigned int order) | |
922 | { | |
36e66c55 AD |
923 | /* clear reported state and update reported page count */ |
924 | if (page_reported(page)) | |
925 | __ClearPageReported(page); | |
926 | ||
6ab01363 AD |
927 | list_del(&page->lru); |
928 | __ClearPageBuddy(page); | |
929 | set_page_private(page, 0); | |
930 | zone->free_area[order].nr_free--; | |
931 | } | |
932 | ||
a2129f24 AD |
933 | /* |
934 | * If this is not the largest possible page, check if the buddy | |
935 | * of the next-highest order is free. If it is, it's possible | |
936 | * that pages are being freed that will coalesce soon. In case, | |
937 | * that is happening, add the free page to the tail of the list | |
938 | * so it's less likely to be used soon and more likely to be merged | |
939 | * as a higher order page | |
940 | */ | |
941 | static inline bool | |
942 | buddy_merge_likely(unsigned long pfn, unsigned long buddy_pfn, | |
943 | struct page *page, unsigned int order) | |
944 | { | |
945 | struct page *higher_page, *higher_buddy; | |
946 | unsigned long combined_pfn; | |
947 | ||
948 | if (order >= MAX_ORDER - 2) | |
949 | return false; | |
950 | ||
951 | if (!pfn_valid_within(buddy_pfn)) | |
952 | return false; | |
953 | ||
954 | combined_pfn = buddy_pfn & pfn; | |
955 | higher_page = page + (combined_pfn - pfn); | |
956 | buddy_pfn = __find_buddy_pfn(combined_pfn, order + 1); | |
957 | higher_buddy = higher_page + (buddy_pfn - combined_pfn); | |
958 | ||
959 | return pfn_valid_within(buddy_pfn) && | |
960 | page_is_buddy(higher_page, higher_buddy, order + 1); | |
961 | } | |
962 | ||
1da177e4 LT |
963 | /* |
964 | * Freeing function for a buddy system allocator. | |
965 | * | |
966 | * The concept of a buddy system is to maintain direct-mapped table | |
967 | * (containing bit values) for memory blocks of various "orders". | |
968 | * The bottom level table contains the map for the smallest allocatable | |
969 | * units of memory (here, pages), and each level above it describes | |
970 | * pairs of units from the levels below, hence, "buddies". | |
971 | * At a high level, all that happens here is marking the table entry | |
972 | * at the bottom level available, and propagating the changes upward | |
973 | * as necessary, plus some accounting needed to play nicely with other | |
974 | * parts of the VM system. | |
975 | * At each level, we keep a list of pages, which are heads of continuous | |
6e292b9b MW |
976 | * free pages of length of (1 << order) and marked with PageBuddy. |
977 | * Page's order is recorded in page_private(page) field. | |
1da177e4 | 978 | * So when we are allocating or freeing one, we can derive the state of the |
5f63b720 MN |
979 | * other. That is, if we allocate a small block, and both were |
980 | * free, the remainder of the region must be split into blocks. | |
1da177e4 | 981 | * If a block is freed, and its buddy is also free, then this |
5f63b720 | 982 | * triggers coalescing into a block of larger size. |
1da177e4 | 983 | * |
6d49e352 | 984 | * -- nyc |
1da177e4 LT |
985 | */ |
986 | ||
48db57f8 | 987 | static inline void __free_one_page(struct page *page, |
dc4b0caf | 988 | unsigned long pfn, |
ed0ae21d | 989 | struct zone *zone, unsigned int order, |
f04a5d5d | 990 | int migratetype, fpi_t fpi_flags) |
1da177e4 | 991 | { |
a2129f24 | 992 | struct capture_control *capc = task_capc(zone); |
3f649ab7 | 993 | unsigned long buddy_pfn; |
a2129f24 | 994 | unsigned long combined_pfn; |
d9dddbf5 | 995 | unsigned int max_order; |
a2129f24 AD |
996 | struct page *buddy; |
997 | bool to_tail; | |
d9dddbf5 | 998 | |
7ad69832 | 999 | max_order = min_t(unsigned int, MAX_ORDER - 1, pageblock_order); |
1da177e4 | 1000 | |
d29bb978 | 1001 | VM_BUG_ON(!zone_is_initialized(zone)); |
6e9f0d58 | 1002 | VM_BUG_ON_PAGE(page->flags & PAGE_FLAGS_CHECK_AT_PREP, page); |
1da177e4 | 1003 | |
ed0ae21d | 1004 | VM_BUG_ON(migratetype == -1); |
d9dddbf5 | 1005 | if (likely(!is_migrate_isolate(migratetype))) |
8f82b55d | 1006 | __mod_zone_freepage_state(zone, 1 << order, migratetype); |
ed0ae21d | 1007 | |
76741e77 | 1008 | VM_BUG_ON_PAGE(pfn & ((1 << order) - 1), page); |
309381fe | 1009 | VM_BUG_ON_PAGE(bad_range(zone, page), page); |
1da177e4 | 1010 | |
d9dddbf5 | 1011 | continue_merging: |
7ad69832 | 1012 | while (order < max_order) { |
5e1f0f09 MG |
1013 | if (compaction_capture(capc, page, order, migratetype)) { |
1014 | __mod_zone_freepage_state(zone, -(1 << order), | |
1015 | migratetype); | |
1016 | return; | |
1017 | } | |
76741e77 VB |
1018 | buddy_pfn = __find_buddy_pfn(pfn, order); |
1019 | buddy = page + (buddy_pfn - pfn); | |
13ad59df VB |
1020 | |
1021 | if (!pfn_valid_within(buddy_pfn)) | |
1022 | goto done_merging; | |
cb2b95e1 | 1023 | if (!page_is_buddy(page, buddy, order)) |
d9dddbf5 | 1024 | goto done_merging; |
c0a32fc5 SG |
1025 | /* |
1026 | * Our buddy is free or it is CONFIG_DEBUG_PAGEALLOC guard page, | |
1027 | * merge with it and move up one order. | |
1028 | */ | |
b03641af | 1029 | if (page_is_guard(buddy)) |
2847cf95 | 1030 | clear_page_guard(zone, buddy, order, migratetype); |
b03641af | 1031 | else |
6ab01363 | 1032 | del_page_from_free_list(buddy, zone, order); |
76741e77 VB |
1033 | combined_pfn = buddy_pfn & pfn; |
1034 | page = page + (combined_pfn - pfn); | |
1035 | pfn = combined_pfn; | |
1da177e4 LT |
1036 | order++; |
1037 | } | |
7ad69832 | 1038 | if (order < MAX_ORDER - 1) { |
d9dddbf5 VB |
1039 | /* If we are here, it means order is >= pageblock_order. |
1040 | * We want to prevent merge between freepages on isolate | |
1041 | * pageblock and normal pageblock. Without this, pageblock | |
1042 | * isolation could cause incorrect freepage or CMA accounting. | |
1043 | * | |
1044 | * We don't want to hit this code for the more frequent | |
1045 | * low-order merging. | |
1046 | */ | |
1047 | if (unlikely(has_isolate_pageblock(zone))) { | |
1048 | int buddy_mt; | |
1049 | ||
76741e77 VB |
1050 | buddy_pfn = __find_buddy_pfn(pfn, order); |
1051 | buddy = page + (buddy_pfn - pfn); | |
d9dddbf5 VB |
1052 | buddy_mt = get_pageblock_migratetype(buddy); |
1053 | ||
1054 | if (migratetype != buddy_mt | |
1055 | && (is_migrate_isolate(migratetype) || | |
1056 | is_migrate_isolate(buddy_mt))) | |
1057 | goto done_merging; | |
1058 | } | |
7ad69832 | 1059 | max_order = order + 1; |
d9dddbf5 VB |
1060 | goto continue_merging; |
1061 | } | |
1062 | ||
1063 | done_merging: | |
ab130f91 | 1064 | set_buddy_order(page, order); |
6dda9d55 | 1065 | |
47b6a24a DH |
1066 | if (fpi_flags & FPI_TO_TAIL) |
1067 | to_tail = true; | |
1068 | else if (is_shuffle_order(order)) | |
a2129f24 | 1069 | to_tail = shuffle_pick_tail(); |
97500a4a | 1070 | else |
a2129f24 | 1071 | to_tail = buddy_merge_likely(pfn, buddy_pfn, page, order); |
97500a4a | 1072 | |
a2129f24 | 1073 | if (to_tail) |
6ab01363 | 1074 | add_to_free_list_tail(page, zone, order, migratetype); |
a2129f24 | 1075 | else |
6ab01363 | 1076 | add_to_free_list(page, zone, order, migratetype); |
36e66c55 AD |
1077 | |
1078 | /* Notify page reporting subsystem of freed page */ | |
f04a5d5d | 1079 | if (!(fpi_flags & FPI_SKIP_REPORT_NOTIFY)) |
36e66c55 | 1080 | page_reporting_notify_free(order); |
1da177e4 LT |
1081 | } |
1082 | ||
7bfec6f4 MG |
1083 | /* |
1084 | * A bad page could be due to a number of fields. Instead of multiple branches, | |
1085 | * try and check multiple fields with one check. The caller must do a detailed | |
1086 | * check if necessary. | |
1087 | */ | |
1088 | static inline bool page_expected_state(struct page *page, | |
1089 | unsigned long check_flags) | |
1090 | { | |
1091 | if (unlikely(atomic_read(&page->_mapcount) != -1)) | |
1092 | return false; | |
1093 | ||
1094 | if (unlikely((unsigned long)page->mapping | | |
1095 | page_ref_count(page) | | |
1096 | #ifdef CONFIG_MEMCG | |
bcfe06bf | 1097 | (unsigned long)page_memcg(page) | |
7bfec6f4 MG |
1098 | #endif |
1099 | (page->flags & check_flags))) | |
1100 | return false; | |
1101 | ||
1102 | return true; | |
1103 | } | |
1104 | ||
58b7f119 | 1105 | static const char *page_bad_reason(struct page *page, unsigned long flags) |
1da177e4 | 1106 | { |
82a3241a | 1107 | const char *bad_reason = NULL; |
f0b791a3 | 1108 | |
53f9263b | 1109 | if (unlikely(atomic_read(&page->_mapcount) != -1)) |
f0b791a3 DH |
1110 | bad_reason = "nonzero mapcount"; |
1111 | if (unlikely(page->mapping != NULL)) | |
1112 | bad_reason = "non-NULL mapping"; | |
fe896d18 | 1113 | if (unlikely(page_ref_count(page) != 0)) |
0139aa7b | 1114 | bad_reason = "nonzero _refcount"; |
58b7f119 WY |
1115 | if (unlikely(page->flags & flags)) { |
1116 | if (flags == PAGE_FLAGS_CHECK_AT_PREP) | |
1117 | bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag(s) set"; | |
1118 | else | |
1119 | bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set"; | |
f0b791a3 | 1120 | } |
9edad6ea | 1121 | #ifdef CONFIG_MEMCG |
bcfe06bf | 1122 | if (unlikely(page_memcg(page))) |
9edad6ea JW |
1123 | bad_reason = "page still charged to cgroup"; |
1124 | #endif | |
58b7f119 WY |
1125 | return bad_reason; |
1126 | } | |
1127 | ||
1128 | static void check_free_page_bad(struct page *page) | |
1129 | { | |
1130 | bad_page(page, | |
1131 | page_bad_reason(page, PAGE_FLAGS_CHECK_AT_FREE)); | |
bb552ac6 MG |
1132 | } |
1133 | ||
534fe5e3 | 1134 | static inline int check_free_page(struct page *page) |
bb552ac6 | 1135 | { |
da838d4f | 1136 | if (likely(page_expected_state(page, PAGE_FLAGS_CHECK_AT_FREE))) |
bb552ac6 | 1137 | return 0; |
bb552ac6 MG |
1138 | |
1139 | /* Something has gone sideways, find it */ | |
0d0c48a2 | 1140 | check_free_page_bad(page); |
7bfec6f4 | 1141 | return 1; |
1da177e4 LT |
1142 | } |
1143 | ||
4db7548c MG |
1144 | static int free_tail_pages_check(struct page *head_page, struct page *page) |
1145 | { | |
1146 | int ret = 1; | |
1147 | ||
1148 | /* | |
1149 | * We rely page->lru.next never has bit 0 set, unless the page | |
1150 | * is PageTail(). Let's make sure that's true even for poisoned ->lru. | |
1151 | */ | |
1152 | BUILD_BUG_ON((unsigned long)LIST_POISON1 & 1); | |
1153 | ||
1154 | if (!IS_ENABLED(CONFIG_DEBUG_VM)) { | |
1155 | ret = 0; | |
1156 | goto out; | |
1157 | } | |
1158 | switch (page - head_page) { | |
1159 | case 1: | |
4da1984e | 1160 | /* the first tail page: ->mapping may be compound_mapcount() */ |
4db7548c | 1161 | if (unlikely(compound_mapcount(page))) { |
82a3241a | 1162 | bad_page(page, "nonzero compound_mapcount"); |
4db7548c MG |
1163 | goto out; |
1164 | } | |
1165 | break; | |
1166 | case 2: | |
1167 | /* | |
1168 | * the second tail page: ->mapping is | |
fa3015b7 | 1169 | * deferred_list.next -- ignore value. |
4db7548c MG |
1170 | */ |
1171 | break; | |
1172 | default: | |
1173 | if (page->mapping != TAIL_MAPPING) { | |
82a3241a | 1174 | bad_page(page, "corrupted mapping in tail page"); |
4db7548c MG |
1175 | goto out; |
1176 | } | |
1177 | break; | |
1178 | } | |
1179 | if (unlikely(!PageTail(page))) { | |
82a3241a | 1180 | bad_page(page, "PageTail not set"); |
4db7548c MG |
1181 | goto out; |
1182 | } | |
1183 | if (unlikely(compound_head(page) != head_page)) { | |
82a3241a | 1184 | bad_page(page, "compound_head not consistent"); |
4db7548c MG |
1185 | goto out; |
1186 | } | |
1187 | ret = 0; | |
1188 | out: | |
1189 | page->mapping = NULL; | |
1190 | clear_compound_head(page); | |
1191 | return ret; | |
1192 | } | |
1193 | ||
6471384a AP |
1194 | static void kernel_init_free_pages(struct page *page, int numpages) |
1195 | { | |
1196 | int i; | |
1197 | ||
9e15afa5 QC |
1198 | /* s390's use of memset() could override KASAN redzones. */ |
1199 | kasan_disable_current(); | |
aa1ef4d7 | 1200 | for (i = 0; i < numpages; i++) { |
acb35b17 | 1201 | u8 tag = page_kasan_tag(page + i); |
aa1ef4d7 | 1202 | page_kasan_tag_reset(page + i); |
6471384a | 1203 | clear_highpage(page + i); |
acb35b17 | 1204 | page_kasan_tag_set(page + i, tag); |
aa1ef4d7 | 1205 | } |
9e15afa5 | 1206 | kasan_enable_current(); |
6471384a AP |
1207 | } |
1208 | ||
e2769dbd MG |
1209 | static __always_inline bool free_pages_prepare(struct page *page, |
1210 | unsigned int order, bool check_free) | |
4db7548c | 1211 | { |
e2769dbd | 1212 | int bad = 0; |
4db7548c | 1213 | |
4db7548c MG |
1214 | VM_BUG_ON_PAGE(PageTail(page), page); |
1215 | ||
e2769dbd | 1216 | trace_mm_page_free(page, order); |
e2769dbd | 1217 | |
79f5f8fa OS |
1218 | if (unlikely(PageHWPoison(page)) && !order) { |
1219 | /* | |
1220 | * Do not let hwpoison pages hit pcplists/buddy | |
1221 | * Untie memcg state and reset page's owner | |
1222 | */ | |
18b2db3b | 1223 | if (memcg_kmem_enabled() && PageMemcgKmem(page)) |
79f5f8fa OS |
1224 | __memcg_kmem_uncharge_page(page, order); |
1225 | reset_page_owner(page, order); | |
1226 | return false; | |
1227 | } | |
1228 | ||
e2769dbd MG |
1229 | /* |
1230 | * Check tail pages before head page information is cleared to | |
1231 | * avoid checking PageCompound for order-0 pages. | |
1232 | */ | |
1233 | if (unlikely(order)) { | |
1234 | bool compound = PageCompound(page); | |
1235 | int i; | |
1236 | ||
1237 | VM_BUG_ON_PAGE(compound && compound_order(page) != order, page); | |
4db7548c | 1238 | |
9a73f61b KS |
1239 | if (compound) |
1240 | ClearPageDoubleMap(page); | |
e2769dbd MG |
1241 | for (i = 1; i < (1 << order); i++) { |
1242 | if (compound) | |
1243 | bad += free_tail_pages_check(page, page + i); | |
534fe5e3 | 1244 | if (unlikely(check_free_page(page + i))) { |
e2769dbd MG |
1245 | bad++; |
1246 | continue; | |
1247 | } | |
1248 | (page + i)->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; | |
1249 | } | |
1250 | } | |
bda807d4 | 1251 | if (PageMappingFlags(page)) |
4db7548c | 1252 | page->mapping = NULL; |
18b2db3b | 1253 | if (memcg_kmem_enabled() && PageMemcgKmem(page)) |
f4b00eab | 1254 | __memcg_kmem_uncharge_page(page, order); |
e2769dbd | 1255 | if (check_free) |
534fe5e3 | 1256 | bad += check_free_page(page); |
e2769dbd MG |
1257 | if (bad) |
1258 | return false; | |
4db7548c | 1259 | |
e2769dbd MG |
1260 | page_cpupid_reset_last(page); |
1261 | page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; | |
1262 | reset_page_owner(page, order); | |
4db7548c MG |
1263 | |
1264 | if (!PageHighMem(page)) { | |
1265 | debug_check_no_locks_freed(page_address(page), | |
e2769dbd | 1266 | PAGE_SIZE << order); |
4db7548c | 1267 | debug_check_no_obj_freed(page_address(page), |
e2769dbd | 1268 | PAGE_SIZE << order); |
4db7548c | 1269 | } |
6471384a AP |
1270 | if (want_init_on_free()) |
1271 | kernel_init_free_pages(page, 1 << order); | |
1272 | ||
8db26a3d VB |
1273 | kernel_poison_pages(page, 1 << order); |
1274 | ||
b7e894c7 AK |
1275 | /* |
1276 | * With hardware tag-based KASAN, memory tags must be set before the | |
1277 | * page becomes unavailable via debug_pagealloc or arch_free_page. | |
1278 | */ | |
1279 | kasan_free_nondeferred_pages(page, order); | |
1280 | ||
234fdce8 QC |
1281 | /* |
1282 | * arch_free_page() can make the page's contents inaccessible. s390 | |
1283 | * does this. So nothing which can access the page's contents should | |
1284 | * happen after this. | |
1285 | */ | |
1286 | arch_free_page(page, order); | |
1287 | ||
77bc7fd6 | 1288 | debug_pagealloc_unmap_pages(page, 1 << order); |
d6332692 | 1289 | |
4db7548c MG |
1290 | return true; |
1291 | } | |
1292 | ||
e2769dbd | 1293 | #ifdef CONFIG_DEBUG_VM |
4462b32c VB |
1294 | /* |
1295 | * With DEBUG_VM enabled, order-0 pages are checked immediately when being freed | |
1296 | * to pcp lists. With debug_pagealloc also enabled, they are also rechecked when | |
1297 | * moved from pcp lists to free lists. | |
1298 | */ | |
1299 | static bool free_pcp_prepare(struct page *page) | |
e2769dbd MG |
1300 | { |
1301 | return free_pages_prepare(page, 0, true); | |
1302 | } | |
1303 | ||
4462b32c | 1304 | static bool bulkfree_pcp_prepare(struct page *page) |
e2769dbd | 1305 | { |
8e57f8ac | 1306 | if (debug_pagealloc_enabled_static()) |
534fe5e3 | 1307 | return check_free_page(page); |
4462b32c VB |
1308 | else |
1309 | return false; | |
e2769dbd MG |
1310 | } |
1311 | #else | |
4462b32c VB |
1312 | /* |
1313 | * With DEBUG_VM disabled, order-0 pages being freed are checked only when | |
1314 | * moving from pcp lists to free list in order to reduce overhead. With | |
1315 | * debug_pagealloc enabled, they are checked also immediately when being freed | |
1316 | * to the pcp lists. | |
1317 | */ | |
e2769dbd MG |
1318 | static bool free_pcp_prepare(struct page *page) |
1319 | { | |
8e57f8ac | 1320 | if (debug_pagealloc_enabled_static()) |
4462b32c VB |
1321 | return free_pages_prepare(page, 0, true); |
1322 | else | |
1323 | return free_pages_prepare(page, 0, false); | |
e2769dbd MG |
1324 | } |
1325 | ||
4db7548c MG |
1326 | static bool bulkfree_pcp_prepare(struct page *page) |
1327 | { | |
534fe5e3 | 1328 | return check_free_page(page); |
4db7548c MG |
1329 | } |
1330 | #endif /* CONFIG_DEBUG_VM */ | |
1331 | ||
97334162 AL |
1332 | static inline void prefetch_buddy(struct page *page) |
1333 | { | |
1334 | unsigned long pfn = page_to_pfn(page); | |
1335 | unsigned long buddy_pfn = __find_buddy_pfn(pfn, 0); | |
1336 | struct page *buddy = page + (buddy_pfn - pfn); | |
1337 | ||
1338 | prefetch(buddy); | |
1339 | } | |
1340 | ||
1da177e4 | 1341 | /* |
5f8dcc21 | 1342 | * Frees a number of pages from the PCP lists |
1da177e4 | 1343 | * Assumes all pages on list are in same zone, and of same order. |
207f36ee | 1344 | * count is the number of pages to free. |
1da177e4 LT |
1345 | * |
1346 | * If the zone was previously in an "all pages pinned" state then look to | |
1347 | * see if this freeing clears that state. | |
1348 | * | |
1349 | * And clear the zone's pages_scanned counter, to hold off the "all pages are | |
1350 | * pinned" detection logic. | |
1351 | */ | |
5f8dcc21 MG |
1352 | static void free_pcppages_bulk(struct zone *zone, int count, |
1353 | struct per_cpu_pages *pcp) | |
1da177e4 | 1354 | { |
5f8dcc21 | 1355 | int migratetype = 0; |
a6f9edd6 | 1356 | int batch_free = 0; |
5c3ad2eb | 1357 | int prefetch_nr = READ_ONCE(pcp->batch); |
3777999d | 1358 | bool isolated_pageblocks; |
0a5f4e5b AL |
1359 | struct page *page, *tmp; |
1360 | LIST_HEAD(head); | |
f2260e6b | 1361 | |
88e8ac11 CTR |
1362 | /* |
1363 | * Ensure proper count is passed which otherwise would stuck in the | |
1364 | * below while (list_empty(list)) loop. | |
1365 | */ | |
1366 | count = min(pcp->count, count); | |
e5b31ac2 | 1367 | while (count) { |
5f8dcc21 MG |
1368 | struct list_head *list; |
1369 | ||
1370 | /* | |
a6f9edd6 MG |
1371 | * Remove pages from lists in a round-robin fashion. A |
1372 | * batch_free count is maintained that is incremented when an | |
1373 | * empty list is encountered. This is so more pages are freed | |
1374 | * off fuller lists instead of spinning excessively around empty | |
1375 | * lists | |
5f8dcc21 MG |
1376 | */ |
1377 | do { | |
a6f9edd6 | 1378 | batch_free++; |
5f8dcc21 MG |
1379 | if (++migratetype == MIGRATE_PCPTYPES) |
1380 | migratetype = 0; | |
1381 | list = &pcp->lists[migratetype]; | |
1382 | } while (list_empty(list)); | |
48db57f8 | 1383 | |
1d16871d NK |
1384 | /* This is the only non-empty list. Free them all. */ |
1385 | if (batch_free == MIGRATE_PCPTYPES) | |
e5b31ac2 | 1386 | batch_free = count; |
1d16871d | 1387 | |
a6f9edd6 | 1388 | do { |
a16601c5 | 1389 | page = list_last_entry(list, struct page, lru); |
0a5f4e5b | 1390 | /* must delete to avoid corrupting pcp list */ |
a6f9edd6 | 1391 | list_del(&page->lru); |
77ba9062 | 1392 | pcp->count--; |
aa016d14 | 1393 | |
4db7548c MG |
1394 | if (bulkfree_pcp_prepare(page)) |
1395 | continue; | |
1396 | ||
0a5f4e5b | 1397 | list_add_tail(&page->lru, &head); |
97334162 AL |
1398 | |
1399 | /* | |
1400 | * We are going to put the page back to the global | |
1401 | * pool, prefetch its buddy to speed up later access | |
1402 | * under zone->lock. It is believed the overhead of | |
1403 | * an additional test and calculating buddy_pfn here | |
1404 | * can be offset by reduced memory latency later. To | |
1405 | * avoid excessive prefetching due to large count, only | |
1406 | * prefetch buddy for the first pcp->batch nr of pages. | |
1407 | */ | |
5c3ad2eb | 1408 | if (prefetch_nr) { |
97334162 | 1409 | prefetch_buddy(page); |
5c3ad2eb VB |
1410 | prefetch_nr--; |
1411 | } | |
e5b31ac2 | 1412 | } while (--count && --batch_free && !list_empty(list)); |
1da177e4 | 1413 | } |
0a5f4e5b AL |
1414 | |
1415 | spin_lock(&zone->lock); | |
1416 | isolated_pageblocks = has_isolate_pageblock(zone); | |
1417 | ||
1418 | /* | |
1419 | * Use safe version since after __free_one_page(), | |
1420 | * page->lru.next will not point to original list. | |
1421 | */ | |
1422 | list_for_each_entry_safe(page, tmp, &head, lru) { | |
1423 | int mt = get_pcppage_migratetype(page); | |
1424 | /* MIGRATE_ISOLATE page should not go to pcplists */ | |
1425 | VM_BUG_ON_PAGE(is_migrate_isolate(mt), page); | |
1426 | /* Pageblock could have been isolated meanwhile */ | |
1427 | if (unlikely(isolated_pageblocks)) | |
1428 | mt = get_pageblock_migratetype(page); | |
1429 | ||
f04a5d5d | 1430 | __free_one_page(page, page_to_pfn(page), zone, 0, mt, FPI_NONE); |
0a5f4e5b AL |
1431 | trace_mm_page_pcpu_drain(page, 0, mt); |
1432 | } | |
d34b0733 | 1433 | spin_unlock(&zone->lock); |
1da177e4 LT |
1434 | } |
1435 | ||
dc4b0caf MG |
1436 | static void free_one_page(struct zone *zone, |
1437 | struct page *page, unsigned long pfn, | |
7aeb09f9 | 1438 | unsigned int order, |
7fef431b | 1439 | int migratetype, fpi_t fpi_flags) |
1da177e4 | 1440 | { |
d34b0733 | 1441 | spin_lock(&zone->lock); |
ad53f92e JK |
1442 | if (unlikely(has_isolate_pageblock(zone) || |
1443 | is_migrate_isolate(migratetype))) { | |
1444 | migratetype = get_pfnblock_migratetype(page, pfn); | |
ad53f92e | 1445 | } |
7fef431b | 1446 | __free_one_page(page, pfn, zone, order, migratetype, fpi_flags); |
d34b0733 | 1447 | spin_unlock(&zone->lock); |
48db57f8 NP |
1448 | } |
1449 | ||
1e8ce83c | 1450 | static void __meminit __init_single_page(struct page *page, unsigned long pfn, |
d0dc12e8 | 1451 | unsigned long zone, int nid) |
1e8ce83c | 1452 | { |
d0dc12e8 | 1453 | mm_zero_struct_page(page); |
1e8ce83c | 1454 | set_page_links(page, zone, nid, pfn); |
1e8ce83c RH |
1455 | init_page_count(page); |
1456 | page_mapcount_reset(page); | |
1457 | page_cpupid_reset_last(page); | |
2813b9c0 | 1458 | page_kasan_tag_reset(page); |
1e8ce83c | 1459 | |
1e8ce83c RH |
1460 | INIT_LIST_HEAD(&page->lru); |
1461 | #ifdef WANT_PAGE_VIRTUAL | |
1462 | /* The shift won't overflow because ZONE_NORMAL is below 4G. */ | |
1463 | if (!is_highmem_idx(zone)) | |
1464 | set_page_address(page, __va(pfn << PAGE_SHIFT)); | |
1465 | #endif | |
1466 | } | |
1467 | ||
7e18adb4 | 1468 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
57148a64 | 1469 | static void __meminit init_reserved_page(unsigned long pfn) |
7e18adb4 MG |
1470 | { |
1471 | pg_data_t *pgdat; | |
1472 | int nid, zid; | |
1473 | ||
1474 | if (!early_page_uninitialised(pfn)) | |
1475 | return; | |
1476 | ||
1477 | nid = early_pfn_to_nid(pfn); | |
1478 | pgdat = NODE_DATA(nid); | |
1479 | ||
1480 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
1481 | struct zone *zone = &pgdat->node_zones[zid]; | |
1482 | ||
1483 | if (pfn >= zone->zone_start_pfn && pfn < zone_end_pfn(zone)) | |
1484 | break; | |
1485 | } | |
d0dc12e8 | 1486 | __init_single_page(pfn_to_page(pfn), pfn, zid, nid); |
7e18adb4 MG |
1487 | } |
1488 | #else | |
1489 | static inline void init_reserved_page(unsigned long pfn) | |
1490 | { | |
1491 | } | |
1492 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ | |
1493 | ||
92923ca3 NZ |
1494 | /* |
1495 | * Initialised pages do not have PageReserved set. This function is | |
1496 | * called for each range allocated by the bootmem allocator and | |
1497 | * marks the pages PageReserved. The remaining valid pages are later | |
1498 | * sent to the buddy page allocator. | |
1499 | */ | |
4b50bcc7 | 1500 | void __meminit reserve_bootmem_region(phys_addr_t start, phys_addr_t end) |
92923ca3 NZ |
1501 | { |
1502 | unsigned long start_pfn = PFN_DOWN(start); | |
1503 | unsigned long end_pfn = PFN_UP(end); | |
1504 | ||
7e18adb4 MG |
1505 | for (; start_pfn < end_pfn; start_pfn++) { |
1506 | if (pfn_valid(start_pfn)) { | |
1507 | struct page *page = pfn_to_page(start_pfn); | |
1508 | ||
1509 | init_reserved_page(start_pfn); | |
1d798ca3 KS |
1510 | |
1511 | /* Avoid false-positive PageTail() */ | |
1512 | INIT_LIST_HEAD(&page->lru); | |
1513 | ||
d483da5b AD |
1514 | /* |
1515 | * no need for atomic set_bit because the struct | |
1516 | * page is not visible yet so nobody should | |
1517 | * access it yet. | |
1518 | */ | |
1519 | __SetPageReserved(page); | |
7e18adb4 MG |
1520 | } |
1521 | } | |
92923ca3 NZ |
1522 | } |
1523 | ||
7fef431b DH |
1524 | static void __free_pages_ok(struct page *page, unsigned int order, |
1525 | fpi_t fpi_flags) | |
ec95f53a | 1526 | { |
d34b0733 | 1527 | unsigned long flags; |
95e34412 | 1528 | int migratetype; |
dc4b0caf | 1529 | unsigned long pfn = page_to_pfn(page); |
ec95f53a | 1530 | |
e2769dbd | 1531 | if (!free_pages_prepare(page, order, true)) |
ec95f53a KM |
1532 | return; |
1533 | ||
cfc47a28 | 1534 | migratetype = get_pfnblock_migratetype(page, pfn); |
d34b0733 MG |
1535 | local_irq_save(flags); |
1536 | __count_vm_events(PGFREE, 1 << order); | |
7fef431b DH |
1537 | free_one_page(page_zone(page), page, pfn, order, migratetype, |
1538 | fpi_flags); | |
d34b0733 | 1539 | local_irq_restore(flags); |
1da177e4 LT |
1540 | } |
1541 | ||
a9cd410a | 1542 | void __free_pages_core(struct page *page, unsigned int order) |
a226f6c8 | 1543 | { |
c3993076 | 1544 | unsigned int nr_pages = 1 << order; |
e2d0bd2b | 1545 | struct page *p = page; |
c3993076 | 1546 | unsigned int loop; |
a226f6c8 | 1547 | |
7fef431b DH |
1548 | /* |
1549 | * When initializing the memmap, __init_single_page() sets the refcount | |
1550 | * of all pages to 1 ("allocated"/"not free"). We have to set the | |
1551 | * refcount of all involved pages to 0. | |
1552 | */ | |
e2d0bd2b YL |
1553 | prefetchw(p); |
1554 | for (loop = 0; loop < (nr_pages - 1); loop++, p++) { | |
1555 | prefetchw(p + 1); | |
c3993076 JW |
1556 | __ClearPageReserved(p); |
1557 | set_page_count(p, 0); | |
a226f6c8 | 1558 | } |
e2d0bd2b YL |
1559 | __ClearPageReserved(p); |
1560 | set_page_count(p, 0); | |
c3993076 | 1561 | |
9705bea5 | 1562 | atomic_long_add(nr_pages, &page_zone(page)->managed_pages); |
7fef431b DH |
1563 | |
1564 | /* | |
1565 | * Bypass PCP and place fresh pages right to the tail, primarily | |
1566 | * relevant for memory onlining. | |
1567 | */ | |
1568 | __free_pages_ok(page, order, FPI_TO_TAIL); | |
a226f6c8 DH |
1569 | } |
1570 | ||
3f08a302 | 1571 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
7ace9917 | 1572 | |
03e92a5e MR |
1573 | /* |
1574 | * During memory init memblocks map pfns to nids. The search is expensive and | |
1575 | * this caches recent lookups. The implementation of __early_pfn_to_nid | |
1576 | * treats start/end as pfns. | |
1577 | */ | |
1578 | struct mminit_pfnnid_cache { | |
1579 | unsigned long last_start; | |
1580 | unsigned long last_end; | |
1581 | int last_nid; | |
1582 | }; | |
75a592a4 | 1583 | |
03e92a5e | 1584 | static struct mminit_pfnnid_cache early_pfnnid_cache __meminitdata; |
6f24fbd3 MR |
1585 | |
1586 | /* | |
1587 | * Required by SPARSEMEM. Given a PFN, return what node the PFN is on. | |
1588 | */ | |
03e92a5e | 1589 | static int __meminit __early_pfn_to_nid(unsigned long pfn, |
6f24fbd3 | 1590 | struct mminit_pfnnid_cache *state) |
75a592a4 | 1591 | { |
6f24fbd3 | 1592 | unsigned long start_pfn, end_pfn; |
75a592a4 MG |
1593 | int nid; |
1594 | ||
6f24fbd3 MR |
1595 | if (state->last_start <= pfn && pfn < state->last_end) |
1596 | return state->last_nid; | |
1597 | ||
1598 | nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn); | |
1599 | if (nid != NUMA_NO_NODE) { | |
1600 | state->last_start = start_pfn; | |
1601 | state->last_end = end_pfn; | |
1602 | state->last_nid = nid; | |
1603 | } | |
7ace9917 MG |
1604 | |
1605 | return nid; | |
75a592a4 | 1606 | } |
75a592a4 | 1607 | |
75a592a4 | 1608 | int __meminit early_pfn_to_nid(unsigned long pfn) |
75a592a4 | 1609 | { |
7ace9917 | 1610 | static DEFINE_SPINLOCK(early_pfn_lock); |
75a592a4 MG |
1611 | int nid; |
1612 | ||
7ace9917 | 1613 | spin_lock(&early_pfn_lock); |
56ec43d8 | 1614 | nid = __early_pfn_to_nid(pfn, &early_pfnnid_cache); |
7ace9917 | 1615 | if (nid < 0) |
e4568d38 | 1616 | nid = first_online_node; |
7ace9917 | 1617 | spin_unlock(&early_pfn_lock); |
75a592a4 | 1618 | |
7ace9917 | 1619 | return nid; |
75a592a4 | 1620 | } |
3f08a302 | 1621 | #endif /* CONFIG_NEED_MULTIPLE_NODES */ |
75a592a4 | 1622 | |
7c2ee349 | 1623 | void __init memblock_free_pages(struct page *page, unsigned long pfn, |
3a80a7fa MG |
1624 | unsigned int order) |
1625 | { | |
1626 | if (early_page_uninitialised(pfn)) | |
1627 | return; | |
a9cd410a | 1628 | __free_pages_core(page, order); |
3a80a7fa MG |
1629 | } |
1630 | ||
7cf91a98 JK |
1631 | /* |
1632 | * Check that the whole (or subset of) a pageblock given by the interval of | |
1633 | * [start_pfn, end_pfn) is valid and within the same zone, before scanning it | |
1634 | * with the migration of free compaction scanner. The scanners then need to | |
1635 | * use only pfn_valid_within() check for arches that allow holes within | |
1636 | * pageblocks. | |
1637 | * | |
1638 | * Return struct page pointer of start_pfn, or NULL if checks were not passed. | |
1639 | * | |
1640 | * It's possible on some configurations to have a setup like node0 node1 node0 | |
1641 | * i.e. it's possible that all pages within a zones range of pages do not | |
1642 | * belong to a single zone. We assume that a border between node0 and node1 | |
1643 | * can occur within a single pageblock, but not a node0 node1 node0 | |
1644 | * interleaving within a single pageblock. It is therefore sufficient to check | |
1645 | * the first and last page of a pageblock and avoid checking each individual | |
1646 | * page in a pageblock. | |
1647 | */ | |
1648 | struct page *__pageblock_pfn_to_page(unsigned long start_pfn, | |
1649 | unsigned long end_pfn, struct zone *zone) | |
1650 | { | |
1651 | struct page *start_page; | |
1652 | struct page *end_page; | |
1653 | ||
1654 | /* end_pfn is one past the range we are checking */ | |
1655 | end_pfn--; | |
1656 | ||
1657 | if (!pfn_valid(start_pfn) || !pfn_valid(end_pfn)) | |
1658 | return NULL; | |
1659 | ||
2d070eab MH |
1660 | start_page = pfn_to_online_page(start_pfn); |
1661 | if (!start_page) | |
1662 | return NULL; | |
7cf91a98 JK |
1663 | |
1664 | if (page_zone(start_page) != zone) | |
1665 | return NULL; | |
1666 | ||
1667 | end_page = pfn_to_page(end_pfn); | |
1668 | ||
1669 | /* This gives a shorter code than deriving page_zone(end_page) */ | |
1670 | if (page_zone_id(start_page) != page_zone_id(end_page)) | |
1671 | return NULL; | |
1672 | ||
1673 | return start_page; | |
1674 | } | |
1675 | ||
1676 | void set_zone_contiguous(struct zone *zone) | |
1677 | { | |
1678 | unsigned long block_start_pfn = zone->zone_start_pfn; | |
1679 | unsigned long block_end_pfn; | |
1680 | ||
1681 | block_end_pfn = ALIGN(block_start_pfn + 1, pageblock_nr_pages); | |
1682 | for (; block_start_pfn < zone_end_pfn(zone); | |
1683 | block_start_pfn = block_end_pfn, | |
1684 | block_end_pfn += pageblock_nr_pages) { | |
1685 | ||
1686 | block_end_pfn = min(block_end_pfn, zone_end_pfn(zone)); | |
1687 | ||
1688 | if (!__pageblock_pfn_to_page(block_start_pfn, | |
1689 | block_end_pfn, zone)) | |
1690 | return; | |
e84fe99b | 1691 | cond_resched(); |
7cf91a98 JK |
1692 | } |
1693 | ||
1694 | /* We confirm that there is no hole */ | |
1695 | zone->contiguous = true; | |
1696 | } | |
1697 | ||
1698 | void clear_zone_contiguous(struct zone *zone) | |
1699 | { | |
1700 | zone->contiguous = false; | |
1701 | } | |
1702 | ||
7e18adb4 | 1703 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
2f47a91f PT |
1704 | static void __init deferred_free_range(unsigned long pfn, |
1705 | unsigned long nr_pages) | |
a4de83dd | 1706 | { |
2f47a91f PT |
1707 | struct page *page; |
1708 | unsigned long i; | |
a4de83dd | 1709 | |
2f47a91f | 1710 | if (!nr_pages) |
a4de83dd MG |
1711 | return; |
1712 | ||
2f47a91f PT |
1713 | page = pfn_to_page(pfn); |
1714 | ||
a4de83dd | 1715 | /* Free a large naturally-aligned chunk if possible */ |
e780149b XQ |
1716 | if (nr_pages == pageblock_nr_pages && |
1717 | (pfn & (pageblock_nr_pages - 1)) == 0) { | |
ac5d2539 | 1718 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
a9cd410a | 1719 | __free_pages_core(page, pageblock_order); |
a4de83dd MG |
1720 | return; |
1721 | } | |
1722 | ||
e780149b XQ |
1723 | for (i = 0; i < nr_pages; i++, page++, pfn++) { |
1724 | if ((pfn & (pageblock_nr_pages - 1)) == 0) | |
1725 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
a9cd410a | 1726 | __free_pages_core(page, 0); |
e780149b | 1727 | } |
a4de83dd MG |
1728 | } |
1729 | ||
d3cd131d NS |
1730 | /* Completion tracking for deferred_init_memmap() threads */ |
1731 | static atomic_t pgdat_init_n_undone __initdata; | |
1732 | static __initdata DECLARE_COMPLETION(pgdat_init_all_done_comp); | |
1733 | ||
1734 | static inline void __init pgdat_init_report_one_done(void) | |
1735 | { | |
1736 | if (atomic_dec_and_test(&pgdat_init_n_undone)) | |
1737 | complete(&pgdat_init_all_done_comp); | |
1738 | } | |
0e1cc95b | 1739 | |
2f47a91f | 1740 | /* |
80b1f41c PT |
1741 | * Returns true if page needs to be initialized or freed to buddy allocator. |
1742 | * | |
1743 | * First we check if pfn is valid on architectures where it is possible to have | |
1744 | * holes within pageblock_nr_pages. On systems where it is not possible, this | |
1745 | * function is optimized out. | |
1746 | * | |
1747 | * Then, we check if a current large page is valid by only checking the validity | |
1748 | * of the head pfn. | |
2f47a91f | 1749 | */ |
56ec43d8 | 1750 | static inline bool __init deferred_pfn_valid(unsigned long pfn) |
2f47a91f | 1751 | { |
80b1f41c PT |
1752 | if (!pfn_valid_within(pfn)) |
1753 | return false; | |
1754 | if (!(pfn & (pageblock_nr_pages - 1)) && !pfn_valid(pfn)) | |
1755 | return false; | |
80b1f41c PT |
1756 | return true; |
1757 | } | |
2f47a91f | 1758 | |
80b1f41c PT |
1759 | /* |
1760 | * Free pages to buddy allocator. Try to free aligned pages in | |
1761 | * pageblock_nr_pages sizes. | |
1762 | */ | |
56ec43d8 | 1763 | static void __init deferred_free_pages(unsigned long pfn, |
80b1f41c PT |
1764 | unsigned long end_pfn) |
1765 | { | |
80b1f41c PT |
1766 | unsigned long nr_pgmask = pageblock_nr_pages - 1; |
1767 | unsigned long nr_free = 0; | |
2f47a91f | 1768 | |
80b1f41c | 1769 | for (; pfn < end_pfn; pfn++) { |
56ec43d8 | 1770 | if (!deferred_pfn_valid(pfn)) { |
80b1f41c PT |
1771 | deferred_free_range(pfn - nr_free, nr_free); |
1772 | nr_free = 0; | |
1773 | } else if (!(pfn & nr_pgmask)) { | |
1774 | deferred_free_range(pfn - nr_free, nr_free); | |
1775 | nr_free = 1; | |
80b1f41c PT |
1776 | } else { |
1777 | nr_free++; | |
1778 | } | |
1779 | } | |
1780 | /* Free the last block of pages to allocator */ | |
1781 | deferred_free_range(pfn - nr_free, nr_free); | |
2f47a91f PT |
1782 | } |
1783 | ||
80b1f41c PT |
1784 | /* |
1785 | * Initialize struct pages. We minimize pfn page lookups and scheduler checks | |
1786 | * by performing it only once every pageblock_nr_pages. | |
1787 | * Return number of pages initialized. | |
1788 | */ | |
56ec43d8 | 1789 | static unsigned long __init deferred_init_pages(struct zone *zone, |
80b1f41c PT |
1790 | unsigned long pfn, |
1791 | unsigned long end_pfn) | |
2f47a91f | 1792 | { |
2f47a91f | 1793 | unsigned long nr_pgmask = pageblock_nr_pages - 1; |
56ec43d8 | 1794 | int nid = zone_to_nid(zone); |
2f47a91f | 1795 | unsigned long nr_pages = 0; |
56ec43d8 | 1796 | int zid = zone_idx(zone); |
2f47a91f | 1797 | struct page *page = NULL; |
2f47a91f | 1798 | |
80b1f41c | 1799 | for (; pfn < end_pfn; pfn++) { |
56ec43d8 | 1800 | if (!deferred_pfn_valid(pfn)) { |
80b1f41c | 1801 | page = NULL; |
2f47a91f | 1802 | continue; |
80b1f41c | 1803 | } else if (!page || !(pfn & nr_pgmask)) { |
2f47a91f | 1804 | page = pfn_to_page(pfn); |
80b1f41c PT |
1805 | } else { |
1806 | page++; | |
2f47a91f | 1807 | } |
d0dc12e8 | 1808 | __init_single_page(page, pfn, zid, nid); |
80b1f41c | 1809 | nr_pages++; |
2f47a91f | 1810 | } |
80b1f41c | 1811 | return (nr_pages); |
2f47a91f PT |
1812 | } |
1813 | ||
0e56acae AD |
1814 | /* |
1815 | * This function is meant to pre-load the iterator for the zone init. | |
1816 | * Specifically it walks through the ranges until we are caught up to the | |
1817 | * first_init_pfn value and exits there. If we never encounter the value we | |
1818 | * return false indicating there are no valid ranges left. | |
1819 | */ | |
1820 | static bool __init | |
1821 | deferred_init_mem_pfn_range_in_zone(u64 *i, struct zone *zone, | |
1822 | unsigned long *spfn, unsigned long *epfn, | |
1823 | unsigned long first_init_pfn) | |
1824 | { | |
1825 | u64 j; | |
1826 | ||
1827 | /* | |
1828 | * Start out by walking through the ranges in this zone that have | |
1829 | * already been initialized. We don't need to do anything with them | |
1830 | * so we just need to flush them out of the system. | |
1831 | */ | |
1832 | for_each_free_mem_pfn_range_in_zone(j, zone, spfn, epfn) { | |
1833 | if (*epfn <= first_init_pfn) | |
1834 | continue; | |
1835 | if (*spfn < first_init_pfn) | |
1836 | *spfn = first_init_pfn; | |
1837 | *i = j; | |
1838 | return true; | |
1839 | } | |
1840 | ||
1841 | return false; | |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * Initialize and free pages. We do it in two loops: first we initialize | |
1846 | * struct page, then free to buddy allocator, because while we are | |
1847 | * freeing pages we can access pages that are ahead (computing buddy | |
1848 | * page in __free_one_page()). | |
1849 | * | |
1850 | * In order to try and keep some memory in the cache we have the loop | |
1851 | * broken along max page order boundaries. This way we will not cause | |
1852 | * any issues with the buddy page computation. | |
1853 | */ | |
1854 | static unsigned long __init | |
1855 | deferred_init_maxorder(u64 *i, struct zone *zone, unsigned long *start_pfn, | |
1856 | unsigned long *end_pfn) | |
1857 | { | |
1858 | unsigned long mo_pfn = ALIGN(*start_pfn + 1, MAX_ORDER_NR_PAGES); | |
1859 | unsigned long spfn = *start_pfn, epfn = *end_pfn; | |
1860 | unsigned long nr_pages = 0; | |
1861 | u64 j = *i; | |
1862 | ||
1863 | /* First we loop through and initialize the page values */ | |
1864 | for_each_free_mem_pfn_range_in_zone_from(j, zone, start_pfn, end_pfn) { | |
1865 | unsigned long t; | |
1866 | ||
1867 | if (mo_pfn <= *start_pfn) | |
1868 | break; | |
1869 | ||
1870 | t = min(mo_pfn, *end_pfn); | |
1871 | nr_pages += deferred_init_pages(zone, *start_pfn, t); | |
1872 | ||
1873 | if (mo_pfn < *end_pfn) { | |
1874 | *start_pfn = mo_pfn; | |
1875 | break; | |
1876 | } | |
1877 | } | |
1878 | ||
1879 | /* Reset values and now loop through freeing pages as needed */ | |
1880 | swap(j, *i); | |
1881 | ||
1882 | for_each_free_mem_pfn_range_in_zone_from(j, zone, &spfn, &epfn) { | |
1883 | unsigned long t; | |
1884 | ||
1885 | if (mo_pfn <= spfn) | |
1886 | break; | |
1887 | ||
1888 | t = min(mo_pfn, epfn); | |
1889 | deferred_free_pages(spfn, t); | |
1890 | ||
1891 | if (mo_pfn <= epfn) | |
1892 | break; | |
1893 | } | |
1894 | ||
1895 | return nr_pages; | |
1896 | } | |
1897 | ||
e4443149 DJ |
1898 | static void __init |
1899 | deferred_init_memmap_chunk(unsigned long start_pfn, unsigned long end_pfn, | |
1900 | void *arg) | |
1901 | { | |
1902 | unsigned long spfn, epfn; | |
1903 | struct zone *zone = arg; | |
1904 | u64 i; | |
1905 | ||
1906 | deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, start_pfn); | |
1907 | ||
1908 | /* | |
1909 | * Initialize and free pages in MAX_ORDER sized increments so that we | |
1910 | * can avoid introducing any issues with the buddy allocator. | |
1911 | */ | |
1912 | while (spfn < end_pfn) { | |
1913 | deferred_init_maxorder(&i, zone, &spfn, &epfn); | |
1914 | cond_resched(); | |
1915 | } | |
1916 | } | |
1917 | ||
ecd09650 DJ |
1918 | /* An arch may override for more concurrency. */ |
1919 | __weak int __init | |
1920 | deferred_page_init_max_threads(const struct cpumask *node_cpumask) | |
1921 | { | |
1922 | return 1; | |
1923 | } | |
1924 | ||
7e18adb4 | 1925 | /* Initialise remaining memory on a node */ |
0e1cc95b | 1926 | static int __init deferred_init_memmap(void *data) |
7e18adb4 | 1927 | { |
0e1cc95b | 1928 | pg_data_t *pgdat = data; |
0e56acae | 1929 | const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id); |
89c7c402 | 1930 | unsigned long spfn = 0, epfn = 0; |
0e56acae | 1931 | unsigned long first_init_pfn, flags; |
7e18adb4 | 1932 | unsigned long start = jiffies; |
7e18adb4 | 1933 | struct zone *zone; |
e4443149 | 1934 | int zid, max_threads; |
2f47a91f | 1935 | u64 i; |
7e18adb4 | 1936 | |
3a2d7fa8 PT |
1937 | /* Bind memory initialisation thread to a local node if possible */ |
1938 | if (!cpumask_empty(cpumask)) | |
1939 | set_cpus_allowed_ptr(current, cpumask); | |
1940 | ||
1941 | pgdat_resize_lock(pgdat, &flags); | |
1942 | first_init_pfn = pgdat->first_deferred_pfn; | |
0e1cc95b | 1943 | if (first_init_pfn == ULONG_MAX) { |
3a2d7fa8 | 1944 | pgdat_resize_unlock(pgdat, &flags); |
d3cd131d | 1945 | pgdat_init_report_one_done(); |
0e1cc95b MG |
1946 | return 0; |
1947 | } | |
1948 | ||
7e18adb4 MG |
1949 | /* Sanity check boundaries */ |
1950 | BUG_ON(pgdat->first_deferred_pfn < pgdat->node_start_pfn); | |
1951 | BUG_ON(pgdat->first_deferred_pfn > pgdat_end_pfn(pgdat)); | |
1952 | pgdat->first_deferred_pfn = ULONG_MAX; | |
1953 | ||
3d060856 PT |
1954 | /* |
1955 | * Once we unlock here, the zone cannot be grown anymore, thus if an | |
1956 | * interrupt thread must allocate this early in boot, zone must be | |
1957 | * pre-grown prior to start of deferred page initialization. | |
1958 | */ | |
1959 | pgdat_resize_unlock(pgdat, &flags); | |
1960 | ||
7e18adb4 MG |
1961 | /* Only the highest zone is deferred so find it */ |
1962 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
1963 | zone = pgdat->node_zones + zid; | |
1964 | if (first_init_pfn < zone_end_pfn(zone)) | |
1965 | break; | |
1966 | } | |
0e56acae AD |
1967 | |
1968 | /* If the zone is empty somebody else may have cleared out the zone */ | |
1969 | if (!deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, | |
1970 | first_init_pfn)) | |
1971 | goto zone_empty; | |
7e18adb4 | 1972 | |
ecd09650 | 1973 | max_threads = deferred_page_init_max_threads(cpumask); |
7e18adb4 | 1974 | |
117003c3 | 1975 | while (spfn < epfn) { |
e4443149 DJ |
1976 | unsigned long epfn_align = ALIGN(epfn, PAGES_PER_SECTION); |
1977 | struct padata_mt_job job = { | |
1978 | .thread_fn = deferred_init_memmap_chunk, | |
1979 | .fn_arg = zone, | |
1980 | .start = spfn, | |
1981 | .size = epfn_align - spfn, | |
1982 | .align = PAGES_PER_SECTION, | |
1983 | .min_chunk = PAGES_PER_SECTION, | |
1984 | .max_threads = max_threads, | |
1985 | }; | |
1986 | ||
1987 | padata_do_multithreaded(&job); | |
1988 | deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, | |
1989 | epfn_align); | |
117003c3 | 1990 | } |
0e56acae | 1991 | zone_empty: |
7e18adb4 MG |
1992 | /* Sanity check that the next zone really is unpopulated */ |
1993 | WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); | |
1994 | ||
89c7c402 DJ |
1995 | pr_info("node %d deferred pages initialised in %ums\n", |
1996 | pgdat->node_id, jiffies_to_msecs(jiffies - start)); | |
d3cd131d NS |
1997 | |
1998 | pgdat_init_report_one_done(); | |
0e1cc95b MG |
1999 | return 0; |
2000 | } | |
c9e97a19 | 2001 | |
c9e97a19 PT |
2002 | /* |
2003 | * If this zone has deferred pages, try to grow it by initializing enough | |
2004 | * deferred pages to satisfy the allocation specified by order, rounded up to | |
2005 | * the nearest PAGES_PER_SECTION boundary. So we're adding memory in increments | |
2006 | * of SECTION_SIZE bytes by initializing struct pages in increments of | |
2007 | * PAGES_PER_SECTION * sizeof(struct page) bytes. | |
2008 | * | |
2009 | * Return true when zone was grown, otherwise return false. We return true even | |
2010 | * when we grow less than requested, to let the caller decide if there are | |
2011 | * enough pages to satisfy the allocation. | |
2012 | * | |
2013 | * Note: We use noinline because this function is needed only during boot, and | |
2014 | * it is called from a __ref function _deferred_grow_zone. This way we are | |
2015 | * making sure that it is not inlined into permanent text section. | |
2016 | */ | |
2017 | static noinline bool __init | |
2018 | deferred_grow_zone(struct zone *zone, unsigned int order) | |
2019 | { | |
c9e97a19 | 2020 | unsigned long nr_pages_needed = ALIGN(1 << order, PAGES_PER_SECTION); |
837566e7 | 2021 | pg_data_t *pgdat = zone->zone_pgdat; |
c9e97a19 | 2022 | unsigned long first_deferred_pfn = pgdat->first_deferred_pfn; |
0e56acae AD |
2023 | unsigned long spfn, epfn, flags; |
2024 | unsigned long nr_pages = 0; | |
c9e97a19 PT |
2025 | u64 i; |
2026 | ||
2027 | /* Only the last zone may have deferred pages */ | |
2028 | if (zone_end_pfn(zone) != pgdat_end_pfn(pgdat)) | |
2029 | return false; | |
2030 | ||
2031 | pgdat_resize_lock(pgdat, &flags); | |
2032 | ||
c9e97a19 PT |
2033 | /* |
2034 | * If someone grew this zone while we were waiting for spinlock, return | |
2035 | * true, as there might be enough pages already. | |
2036 | */ | |
2037 | if (first_deferred_pfn != pgdat->first_deferred_pfn) { | |
2038 | pgdat_resize_unlock(pgdat, &flags); | |
2039 | return true; | |
2040 | } | |
2041 | ||
0e56acae AD |
2042 | /* If the zone is empty somebody else may have cleared out the zone */ |
2043 | if (!deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, | |
2044 | first_deferred_pfn)) { | |
2045 | pgdat->first_deferred_pfn = ULONG_MAX; | |
c9e97a19 | 2046 | pgdat_resize_unlock(pgdat, &flags); |
b9705d87 JG |
2047 | /* Retry only once. */ |
2048 | return first_deferred_pfn != ULONG_MAX; | |
c9e97a19 PT |
2049 | } |
2050 | ||
0e56acae AD |
2051 | /* |
2052 | * Initialize and free pages in MAX_ORDER sized increments so | |
2053 | * that we can avoid introducing any issues with the buddy | |
2054 | * allocator. | |
2055 | */ | |
2056 | while (spfn < epfn) { | |
2057 | /* update our first deferred PFN for this section */ | |
2058 | first_deferred_pfn = spfn; | |
2059 | ||
2060 | nr_pages += deferred_init_maxorder(&i, zone, &spfn, &epfn); | |
117003c3 | 2061 | touch_nmi_watchdog(); |
c9e97a19 | 2062 | |
0e56acae AD |
2063 | /* We should only stop along section boundaries */ |
2064 | if ((first_deferred_pfn ^ spfn) < PAGES_PER_SECTION) | |
2065 | continue; | |
c9e97a19 | 2066 | |
0e56acae | 2067 | /* If our quota has been met we can stop here */ |
c9e97a19 PT |
2068 | if (nr_pages >= nr_pages_needed) |
2069 | break; | |
2070 | } | |
2071 | ||
0e56acae | 2072 | pgdat->first_deferred_pfn = spfn; |
c9e97a19 PT |
2073 | pgdat_resize_unlock(pgdat, &flags); |
2074 | ||
2075 | return nr_pages > 0; | |
2076 | } | |
2077 | ||
2078 | /* | |
2079 | * deferred_grow_zone() is __init, but it is called from | |
2080 | * get_page_from_freelist() during early boot until deferred_pages permanently | |
2081 | * disables this call. This is why we have refdata wrapper to avoid warning, | |
2082 | * and to ensure that the function body gets unloaded. | |
2083 | */ | |
2084 | static bool __ref | |
2085 | _deferred_grow_zone(struct zone *zone, unsigned int order) | |
2086 | { | |
2087 | return deferred_grow_zone(zone, order); | |
2088 | } | |
2089 | ||
7cf91a98 | 2090 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ |
0e1cc95b MG |
2091 | |
2092 | void __init page_alloc_init_late(void) | |
2093 | { | |
7cf91a98 | 2094 | struct zone *zone; |
e900a918 | 2095 | int nid; |
7cf91a98 JK |
2096 | |
2097 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT | |
0e1cc95b | 2098 | |
d3cd131d NS |
2099 | /* There will be num_node_state(N_MEMORY) threads */ |
2100 | atomic_set(&pgdat_init_n_undone, num_node_state(N_MEMORY)); | |
0e1cc95b | 2101 | for_each_node_state(nid, N_MEMORY) { |
0e1cc95b MG |
2102 | kthread_run(deferred_init_memmap, NODE_DATA(nid), "pgdatinit%d", nid); |
2103 | } | |
2104 | ||
2105 | /* Block until all are initialised */ | |
d3cd131d | 2106 | wait_for_completion(&pgdat_init_all_done_comp); |
4248b0da | 2107 | |
3e8fc007 MG |
2108 | /* |
2109 | * The number of managed pages has changed due to the initialisation | |
2110 | * so the pcpu batch and high limits needs to be updated or the limits | |
2111 | * will be artificially small. | |
2112 | */ | |
2113 | for_each_populated_zone(zone) | |
2114 | zone_pcp_update(zone); | |
2115 | ||
c9e97a19 PT |
2116 | /* |
2117 | * We initialized the rest of the deferred pages. Permanently disable | |
2118 | * on-demand struct page initialization. | |
2119 | */ | |
2120 | static_branch_disable(&deferred_pages); | |
2121 | ||
4248b0da MG |
2122 | /* Reinit limits that are based on free pages after the kernel is up */ |
2123 | files_maxfiles_init(); | |
7cf91a98 | 2124 | #endif |
350e88ba | 2125 | |
ba8f3587 LF |
2126 | buffer_init(); |
2127 | ||
3010f876 PT |
2128 | /* Discard memblock private memory */ |
2129 | memblock_discard(); | |
7cf91a98 | 2130 | |
e900a918 DW |
2131 | for_each_node_state(nid, N_MEMORY) |
2132 | shuffle_free_memory(NODE_DATA(nid)); | |
2133 | ||
7cf91a98 JK |
2134 | for_each_populated_zone(zone) |
2135 | set_zone_contiguous(zone); | |
7e18adb4 | 2136 | } |
7e18adb4 | 2137 | |
47118af0 | 2138 | #ifdef CONFIG_CMA |
9cf510a5 | 2139 | /* Free whole pageblock and set its migration type to MIGRATE_CMA. */ |
47118af0 MN |
2140 | void __init init_cma_reserved_pageblock(struct page *page) |
2141 | { | |
2142 | unsigned i = pageblock_nr_pages; | |
2143 | struct page *p = page; | |
2144 | ||
2145 | do { | |
2146 | __ClearPageReserved(p); | |
2147 | set_page_count(p, 0); | |
d883c6cf | 2148 | } while (++p, --i); |
47118af0 | 2149 | |
47118af0 | 2150 | set_pageblock_migratetype(page, MIGRATE_CMA); |
dc78327c MN |
2151 | |
2152 | if (pageblock_order >= MAX_ORDER) { | |
2153 | i = pageblock_nr_pages; | |
2154 | p = page; | |
2155 | do { | |
2156 | set_page_refcounted(p); | |
2157 | __free_pages(p, MAX_ORDER - 1); | |
2158 | p += MAX_ORDER_NR_PAGES; | |
2159 | } while (i -= MAX_ORDER_NR_PAGES); | |
2160 | } else { | |
2161 | set_page_refcounted(page); | |
2162 | __free_pages(page, pageblock_order); | |
2163 | } | |
2164 | ||
3dcc0571 | 2165 | adjust_managed_page_count(page, pageblock_nr_pages); |
47118af0 MN |
2166 | } |
2167 | #endif | |
1da177e4 LT |
2168 | |
2169 | /* | |
2170 | * The order of subdivision here is critical for the IO subsystem. | |
2171 | * Please do not alter this order without good reasons and regression | |
2172 | * testing. Specifically, as large blocks of memory are subdivided, | |
2173 | * the order in which smaller blocks are delivered depends on the order | |
2174 | * they're subdivided in this function. This is the primary factor | |
2175 | * influencing the order in which pages are delivered to the IO | |
2176 | * subsystem according to empirical testing, and this is also justified | |
2177 | * by considering the behavior of a buddy system containing a single | |
2178 | * large block of memory acted on by a series of small allocations. | |
2179 | * This behavior is a critical factor in sglist merging's success. | |
2180 | * | |
6d49e352 | 2181 | * -- nyc |
1da177e4 | 2182 | */ |
085cc7d5 | 2183 | static inline void expand(struct zone *zone, struct page *page, |
6ab01363 | 2184 | int low, int high, int migratetype) |
1da177e4 LT |
2185 | { |
2186 | unsigned long size = 1 << high; | |
2187 | ||
2188 | while (high > low) { | |
1da177e4 LT |
2189 | high--; |
2190 | size >>= 1; | |
309381fe | 2191 | VM_BUG_ON_PAGE(bad_range(zone, &page[size]), &page[size]); |
c0a32fc5 | 2192 | |
acbc15a4 JK |
2193 | /* |
2194 | * Mark as guard pages (or page), that will allow to | |
2195 | * merge back to allocator when buddy will be freed. | |
2196 | * Corresponding page table entries will not be touched, | |
2197 | * pages will stay not present in virtual address space | |
2198 | */ | |
2199 | if (set_page_guard(zone, &page[size], high, migratetype)) | |
c0a32fc5 | 2200 | continue; |
acbc15a4 | 2201 | |
6ab01363 | 2202 | add_to_free_list(&page[size], zone, high, migratetype); |
ab130f91 | 2203 | set_buddy_order(&page[size], high); |
1da177e4 | 2204 | } |
1da177e4 LT |
2205 | } |
2206 | ||
4e611801 | 2207 | static void check_new_page_bad(struct page *page) |
1da177e4 | 2208 | { |
f4c18e6f | 2209 | if (unlikely(page->flags & __PG_HWPOISON)) { |
e570f56c NH |
2210 | /* Don't complain about hwpoisoned pages */ |
2211 | page_mapcount_reset(page); /* remove PageBuddy */ | |
2212 | return; | |
f4c18e6f | 2213 | } |
58b7f119 WY |
2214 | |
2215 | bad_page(page, | |
2216 | page_bad_reason(page, PAGE_FLAGS_CHECK_AT_PREP)); | |
4e611801 VB |
2217 | } |
2218 | ||
2219 | /* | |
2220 | * This page is about to be returned from the page allocator | |
2221 | */ | |
2222 | static inline int check_new_page(struct page *page) | |
2223 | { | |
2224 | if (likely(page_expected_state(page, | |
2225 | PAGE_FLAGS_CHECK_AT_PREP|__PG_HWPOISON))) | |
2226 | return 0; | |
2227 | ||
2228 | check_new_page_bad(page); | |
2229 | return 1; | |
2a7684a2 WF |
2230 | } |
2231 | ||
479f854a | 2232 | #ifdef CONFIG_DEBUG_VM |
4462b32c VB |
2233 | /* |
2234 | * With DEBUG_VM enabled, order-0 pages are checked for expected state when | |
2235 | * being allocated from pcp lists. With debug_pagealloc also enabled, they are | |
2236 | * also checked when pcp lists are refilled from the free lists. | |
2237 | */ | |
2238 | static inline bool check_pcp_refill(struct page *page) | |
479f854a | 2239 | { |
8e57f8ac | 2240 | if (debug_pagealloc_enabled_static()) |
4462b32c VB |
2241 | return check_new_page(page); |
2242 | else | |
2243 | return false; | |
479f854a MG |
2244 | } |
2245 | ||
4462b32c | 2246 | static inline bool check_new_pcp(struct page *page) |
479f854a MG |
2247 | { |
2248 | return check_new_page(page); | |
2249 | } | |
2250 | #else | |
4462b32c VB |
2251 | /* |
2252 | * With DEBUG_VM disabled, free order-0 pages are checked for expected state | |
2253 | * when pcp lists are being refilled from the free lists. With debug_pagealloc | |
2254 | * enabled, they are also checked when being allocated from the pcp lists. | |
2255 | */ | |
2256 | static inline bool check_pcp_refill(struct page *page) | |
479f854a MG |
2257 | { |
2258 | return check_new_page(page); | |
2259 | } | |
4462b32c | 2260 | static inline bool check_new_pcp(struct page *page) |
479f854a | 2261 | { |
8e57f8ac | 2262 | if (debug_pagealloc_enabled_static()) |
4462b32c VB |
2263 | return check_new_page(page); |
2264 | else | |
2265 | return false; | |
479f854a MG |
2266 | } |
2267 | #endif /* CONFIG_DEBUG_VM */ | |
2268 | ||
2269 | static bool check_new_pages(struct page *page, unsigned int order) | |
2270 | { | |
2271 | int i; | |
2272 | for (i = 0; i < (1 << order); i++) { | |
2273 | struct page *p = page + i; | |
2274 | ||
2275 | if (unlikely(check_new_page(p))) | |
2276 | return true; | |
2277 | } | |
2278 | ||
2279 | return false; | |
2280 | } | |
2281 | ||
46f24fd8 JK |
2282 | inline void post_alloc_hook(struct page *page, unsigned int order, |
2283 | gfp_t gfp_flags) | |
2284 | { | |
2285 | set_page_private(page, 0); | |
2286 | set_page_refcounted(page); | |
2287 | ||
2288 | arch_alloc_page(page, order); | |
77bc7fd6 | 2289 | debug_pagealloc_map_pages(page, 1 << order); |
46f24fd8 | 2290 | kasan_alloc_pages(page, order); |
8db26a3d | 2291 | kernel_unpoison_pages(page, 1 << order); |
46f24fd8 | 2292 | set_page_owner(page, order, gfp_flags); |
862b6dee | 2293 | |
f289041e | 2294 | if (!want_init_on_free() && want_init_on_alloc(gfp_flags)) |
862b6dee | 2295 | kernel_init_free_pages(page, 1 << order); |
46f24fd8 JK |
2296 | } |
2297 | ||
479f854a | 2298 | static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags, |
c603844b | 2299 | unsigned int alloc_flags) |
2a7684a2 | 2300 | { |
46f24fd8 | 2301 | post_alloc_hook(page, order, gfp_flags); |
17cf4406 | 2302 | |
17cf4406 NP |
2303 | if (order && (gfp_flags & __GFP_COMP)) |
2304 | prep_compound_page(page, order); | |
2305 | ||
75379191 | 2306 | /* |
2f064f34 | 2307 | * page is set pfmemalloc when ALLOC_NO_WATERMARKS was necessary to |
75379191 VB |
2308 | * allocate the page. The expectation is that the caller is taking |
2309 | * steps that will free more memory. The caller should avoid the page | |
2310 | * being used for !PFMEMALLOC purposes. | |
2311 | */ | |
2f064f34 MH |
2312 | if (alloc_flags & ALLOC_NO_WATERMARKS) |
2313 | set_page_pfmemalloc(page); | |
2314 | else | |
2315 | clear_page_pfmemalloc(page); | |
1da177e4 LT |
2316 | } |
2317 | ||
56fd56b8 MG |
2318 | /* |
2319 | * Go through the free lists for the given migratetype and remove | |
2320 | * the smallest available page from the freelists | |
2321 | */ | |
85ccc8fa | 2322 | static __always_inline |
728ec980 | 2323 | struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, |
56fd56b8 MG |
2324 | int migratetype) |
2325 | { | |
2326 | unsigned int current_order; | |
b8af2941 | 2327 | struct free_area *area; |
56fd56b8 MG |
2328 | struct page *page; |
2329 | ||
2330 | /* Find a page of the appropriate size in the preferred list */ | |
2331 | for (current_order = order; current_order < MAX_ORDER; ++current_order) { | |
2332 | area = &(zone->free_area[current_order]); | |
b03641af | 2333 | page = get_page_from_free_area(area, migratetype); |
a16601c5 GT |
2334 | if (!page) |
2335 | continue; | |
6ab01363 AD |
2336 | del_page_from_free_list(page, zone, current_order); |
2337 | expand(zone, page, order, current_order, migratetype); | |
bb14c2c7 | 2338 | set_pcppage_migratetype(page, migratetype); |
56fd56b8 MG |
2339 | return page; |
2340 | } | |
2341 | ||
2342 | return NULL; | |
2343 | } | |
2344 | ||
2345 | ||
b2a0ac88 MG |
2346 | /* |
2347 | * This array describes the order lists are fallen back to when | |
2348 | * the free lists for the desirable migrate type are depleted | |
2349 | */ | |
da415663 | 2350 | static int fallbacks[MIGRATE_TYPES][3] = { |
974a786e | 2351 | [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, |
974a786e | 2352 | [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_TYPES }, |
7ead3342 | 2353 | [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, |
47118af0 | 2354 | #ifdef CONFIG_CMA |
974a786e | 2355 | [MIGRATE_CMA] = { MIGRATE_TYPES }, /* Never used */ |
47118af0 | 2356 | #endif |
194159fb | 2357 | #ifdef CONFIG_MEMORY_ISOLATION |
974a786e | 2358 | [MIGRATE_ISOLATE] = { MIGRATE_TYPES }, /* Never used */ |
194159fb | 2359 | #endif |
b2a0ac88 MG |
2360 | }; |
2361 | ||
dc67647b | 2362 | #ifdef CONFIG_CMA |
85ccc8fa | 2363 | static __always_inline struct page *__rmqueue_cma_fallback(struct zone *zone, |
dc67647b JK |
2364 | unsigned int order) |
2365 | { | |
2366 | return __rmqueue_smallest(zone, order, MIGRATE_CMA); | |
2367 | } | |
2368 | #else | |
2369 | static inline struct page *__rmqueue_cma_fallback(struct zone *zone, | |
2370 | unsigned int order) { return NULL; } | |
2371 | #endif | |
2372 | ||
c361be55 | 2373 | /* |
293ffa5e | 2374 | * Move the free pages in a range to the freelist tail of the requested type. |
d9c23400 | 2375 | * Note that start_page and end_pages are not aligned on a pageblock |
c361be55 MG |
2376 | * boundary. If alignment is required, use move_freepages_block() |
2377 | */ | |
02aa0cdd | 2378 | static int move_freepages(struct zone *zone, |
b69a7288 | 2379 | struct page *start_page, struct page *end_page, |
02aa0cdd | 2380 | int migratetype, int *num_movable) |
c361be55 MG |
2381 | { |
2382 | struct page *page; | |
d00181b9 | 2383 | unsigned int order; |
d100313f | 2384 | int pages_moved = 0; |
c361be55 | 2385 | |
c361be55 MG |
2386 | for (page = start_page; page <= end_page;) { |
2387 | if (!pfn_valid_within(page_to_pfn(page))) { | |
2388 | page++; | |
2389 | continue; | |
2390 | } | |
2391 | ||
2392 | if (!PageBuddy(page)) { | |
02aa0cdd VB |
2393 | /* |
2394 | * We assume that pages that could be isolated for | |
2395 | * migration are movable. But we don't actually try | |
2396 | * isolating, as that would be expensive. | |
2397 | */ | |
2398 | if (num_movable && | |
2399 | (PageLRU(page) || __PageMovable(page))) | |
2400 | (*num_movable)++; | |
2401 | ||
c361be55 MG |
2402 | page++; |
2403 | continue; | |
2404 | } | |
2405 | ||
cd961038 DR |
2406 | /* Make sure we are not inadvertently changing nodes */ |
2407 | VM_BUG_ON_PAGE(page_to_nid(page) != zone_to_nid(zone), page); | |
2408 | VM_BUG_ON_PAGE(page_zone(page) != zone, page); | |
2409 | ||
ab130f91 | 2410 | order = buddy_order(page); |
6ab01363 | 2411 | move_to_free_list(page, zone, order, migratetype); |
c361be55 | 2412 | page += 1 << order; |
d100313f | 2413 | pages_moved += 1 << order; |
c361be55 MG |
2414 | } |
2415 | ||
d100313f | 2416 | return pages_moved; |
c361be55 MG |
2417 | } |
2418 | ||
ee6f509c | 2419 | int move_freepages_block(struct zone *zone, struct page *page, |
02aa0cdd | 2420 | int migratetype, int *num_movable) |
c361be55 MG |
2421 | { |
2422 | unsigned long start_pfn, end_pfn; | |
2423 | struct page *start_page, *end_page; | |
2424 | ||
4a222127 DR |
2425 | if (num_movable) |
2426 | *num_movable = 0; | |
2427 | ||
c361be55 | 2428 | start_pfn = page_to_pfn(page); |
d9c23400 | 2429 | start_pfn = start_pfn & ~(pageblock_nr_pages-1); |
c361be55 | 2430 | start_page = pfn_to_page(start_pfn); |
d9c23400 MG |
2431 | end_page = start_page + pageblock_nr_pages - 1; |
2432 | end_pfn = start_pfn + pageblock_nr_pages - 1; | |
c361be55 MG |
2433 | |
2434 | /* Do not cross zone boundaries */ | |
108bcc96 | 2435 | if (!zone_spans_pfn(zone, start_pfn)) |
c361be55 | 2436 | start_page = page; |
108bcc96 | 2437 | if (!zone_spans_pfn(zone, end_pfn)) |
c361be55 MG |
2438 | return 0; |
2439 | ||
02aa0cdd VB |
2440 | return move_freepages(zone, start_page, end_page, migratetype, |
2441 | num_movable); | |
c361be55 MG |
2442 | } |
2443 | ||
2f66a68f MG |
2444 | static void change_pageblock_range(struct page *pageblock_page, |
2445 | int start_order, int migratetype) | |
2446 | { | |
2447 | int nr_pageblocks = 1 << (start_order - pageblock_order); | |
2448 | ||
2449 | while (nr_pageblocks--) { | |
2450 | set_pageblock_migratetype(pageblock_page, migratetype); | |
2451 | pageblock_page += pageblock_nr_pages; | |
2452 | } | |
2453 | } | |
2454 | ||
fef903ef | 2455 | /* |
9c0415eb VB |
2456 | * When we are falling back to another migratetype during allocation, try to |
2457 | * steal extra free pages from the same pageblocks to satisfy further | |
2458 | * allocations, instead of polluting multiple pageblocks. | |
2459 | * | |
2460 | * If we are stealing a relatively large buddy page, it is likely there will | |
2461 | * be more free pages in the pageblock, so try to steal them all. For | |
2462 | * reclaimable and unmovable allocations, we steal regardless of page size, | |
2463 | * as fragmentation caused by those allocations polluting movable pageblocks | |
2464 | * is worse than movable allocations stealing from unmovable and reclaimable | |
2465 | * pageblocks. | |
fef903ef | 2466 | */ |
4eb7dce6 JK |
2467 | static bool can_steal_fallback(unsigned int order, int start_mt) |
2468 | { | |
2469 | /* | |
2470 | * Leaving this order check is intended, although there is | |
2471 | * relaxed order check in next check. The reason is that | |
2472 | * we can actually steal whole pageblock if this condition met, | |
2473 | * but, below check doesn't guarantee it and that is just heuristic | |
2474 | * so could be changed anytime. | |
2475 | */ | |
2476 | if (order >= pageblock_order) | |
2477 | return true; | |
2478 | ||
2479 | if (order >= pageblock_order / 2 || | |
2480 | start_mt == MIGRATE_RECLAIMABLE || | |
2481 | start_mt == MIGRATE_UNMOVABLE || | |
2482 | page_group_by_mobility_disabled) | |
2483 | return true; | |
2484 | ||
2485 | return false; | |
2486 | } | |
2487 | ||
597c8920 | 2488 | static inline bool boost_watermark(struct zone *zone) |
1c30844d MG |
2489 | { |
2490 | unsigned long max_boost; | |
2491 | ||
2492 | if (!watermark_boost_factor) | |
597c8920 | 2493 | return false; |
14f69140 HW |
2494 | /* |
2495 | * Don't bother in zones that are unlikely to produce results. | |
2496 | * On small machines, including kdump capture kernels running | |
2497 | * in a small area, boosting the watermark can cause an out of | |
2498 | * memory situation immediately. | |
2499 | */ | |
2500 | if ((pageblock_nr_pages * 4) > zone_managed_pages(zone)) | |
597c8920 | 2501 | return false; |
1c30844d MG |
2502 | |
2503 | max_boost = mult_frac(zone->_watermark[WMARK_HIGH], | |
2504 | watermark_boost_factor, 10000); | |
94b3334c MG |
2505 | |
2506 | /* | |
2507 | * high watermark may be uninitialised if fragmentation occurs | |
2508 | * very early in boot so do not boost. We do not fall | |
2509 | * through and boost by pageblock_nr_pages as failing | |
2510 | * allocations that early means that reclaim is not going | |
2511 | * to help and it may even be impossible to reclaim the | |
2512 | * boosted watermark resulting in a hang. | |
2513 | */ | |
2514 | if (!max_boost) | |
597c8920 | 2515 | return false; |
94b3334c | 2516 | |
1c30844d MG |
2517 | max_boost = max(pageblock_nr_pages, max_boost); |
2518 | ||
2519 | zone->watermark_boost = min(zone->watermark_boost + pageblock_nr_pages, | |
2520 | max_boost); | |
597c8920 JW |
2521 | |
2522 | return true; | |
1c30844d MG |
2523 | } |
2524 | ||
4eb7dce6 JK |
2525 | /* |
2526 | * This function implements actual steal behaviour. If order is large enough, | |
2527 | * we can steal whole pageblock. If not, we first move freepages in this | |
02aa0cdd VB |
2528 | * pageblock to our migratetype and determine how many already-allocated pages |
2529 | * are there in the pageblock with a compatible migratetype. If at least half | |
2530 | * of pages are free or compatible, we can change migratetype of the pageblock | |
2531 | * itself, so pages freed in the future will be put on the correct free list. | |
4eb7dce6 JK |
2532 | */ |
2533 | static void steal_suitable_fallback(struct zone *zone, struct page *page, | |
1c30844d | 2534 | unsigned int alloc_flags, int start_type, bool whole_block) |
fef903ef | 2535 | { |
ab130f91 | 2536 | unsigned int current_order = buddy_order(page); |
02aa0cdd VB |
2537 | int free_pages, movable_pages, alike_pages; |
2538 | int old_block_type; | |
2539 | ||
2540 | old_block_type = get_pageblock_migratetype(page); | |
fef903ef | 2541 | |
3bc48f96 VB |
2542 | /* |
2543 | * This can happen due to races and we want to prevent broken | |
2544 | * highatomic accounting. | |
2545 | */ | |
02aa0cdd | 2546 | if (is_migrate_highatomic(old_block_type)) |
3bc48f96 VB |
2547 | goto single_page; |
2548 | ||
fef903ef SB |
2549 | /* Take ownership for orders >= pageblock_order */ |
2550 | if (current_order >= pageblock_order) { | |
2551 | change_pageblock_range(page, current_order, start_type); | |
3bc48f96 | 2552 | goto single_page; |
fef903ef SB |
2553 | } |
2554 | ||
1c30844d MG |
2555 | /* |
2556 | * Boost watermarks to increase reclaim pressure to reduce the | |
2557 | * likelihood of future fallbacks. Wake kswapd now as the node | |
2558 | * may be balanced overall and kswapd will not wake naturally. | |
2559 | */ | |
597c8920 | 2560 | if (boost_watermark(zone) && (alloc_flags & ALLOC_KSWAPD)) |
73444bc4 | 2561 | set_bit(ZONE_BOOSTED_WATERMARK, &zone->flags); |
1c30844d | 2562 | |
3bc48f96 VB |
2563 | /* We are not allowed to try stealing from the whole block */ |
2564 | if (!whole_block) | |
2565 | goto single_page; | |
2566 | ||
02aa0cdd VB |
2567 | free_pages = move_freepages_block(zone, page, start_type, |
2568 | &movable_pages); | |
2569 | /* | |
2570 | * Determine how many pages are compatible with our allocation. | |
2571 | * For movable allocation, it's the number of movable pages which | |
2572 | * we just obtained. For other types it's a bit more tricky. | |
2573 | */ | |
2574 | if (start_type == MIGRATE_MOVABLE) { | |
2575 | alike_pages = movable_pages; | |
2576 | } else { | |
2577 | /* | |
2578 | * If we are falling back a RECLAIMABLE or UNMOVABLE allocation | |
2579 | * to MOVABLE pageblock, consider all non-movable pages as | |
2580 | * compatible. If it's UNMOVABLE falling back to RECLAIMABLE or | |
2581 | * vice versa, be conservative since we can't distinguish the | |
2582 | * exact migratetype of non-movable pages. | |
2583 | */ | |
2584 | if (old_block_type == MIGRATE_MOVABLE) | |
2585 | alike_pages = pageblock_nr_pages | |
2586 | - (free_pages + movable_pages); | |
2587 | else | |
2588 | alike_pages = 0; | |
2589 | } | |
2590 | ||
3bc48f96 | 2591 | /* moving whole block can fail due to zone boundary conditions */ |
02aa0cdd | 2592 | if (!free_pages) |
3bc48f96 | 2593 | goto single_page; |
fef903ef | 2594 | |
02aa0cdd VB |
2595 | /* |
2596 | * If a sufficient number of pages in the block are either free or of | |
2597 | * comparable migratability as our allocation, claim the whole block. | |
2598 | */ | |
2599 | if (free_pages + alike_pages >= (1 << (pageblock_order-1)) || | |
4eb7dce6 JK |
2600 | page_group_by_mobility_disabled) |
2601 | set_pageblock_migratetype(page, start_type); | |
3bc48f96 VB |
2602 | |
2603 | return; | |
2604 | ||
2605 | single_page: | |
6ab01363 | 2606 | move_to_free_list(page, zone, current_order, start_type); |
4eb7dce6 JK |
2607 | } |
2608 | ||
2149cdae JK |
2609 | /* |
2610 | * Check whether there is a suitable fallback freepage with requested order. | |
2611 | * If only_stealable is true, this function returns fallback_mt only if | |
2612 | * we can steal other freepages all together. This would help to reduce | |
2613 | * fragmentation due to mixed migratetype pages in one pageblock. | |
2614 | */ | |
2615 | int find_suitable_fallback(struct free_area *area, unsigned int order, | |
2616 | int migratetype, bool only_stealable, bool *can_steal) | |
4eb7dce6 JK |
2617 | { |
2618 | int i; | |
2619 | int fallback_mt; | |
2620 | ||
2621 | if (area->nr_free == 0) | |
2622 | return -1; | |
2623 | ||
2624 | *can_steal = false; | |
2625 | for (i = 0;; i++) { | |
2626 | fallback_mt = fallbacks[migratetype][i]; | |
974a786e | 2627 | if (fallback_mt == MIGRATE_TYPES) |
4eb7dce6 JK |
2628 | break; |
2629 | ||
b03641af | 2630 | if (free_area_empty(area, fallback_mt)) |
4eb7dce6 | 2631 | continue; |
fef903ef | 2632 | |
4eb7dce6 JK |
2633 | if (can_steal_fallback(order, migratetype)) |
2634 | *can_steal = true; | |
2635 | ||
2149cdae JK |
2636 | if (!only_stealable) |
2637 | return fallback_mt; | |
2638 | ||
2639 | if (*can_steal) | |
2640 | return fallback_mt; | |
fef903ef | 2641 | } |
4eb7dce6 JK |
2642 | |
2643 | return -1; | |
fef903ef SB |
2644 | } |
2645 | ||
0aaa29a5 MG |
2646 | /* |
2647 | * Reserve a pageblock for exclusive use of high-order atomic allocations if | |
2648 | * there are no empty page blocks that contain a page with a suitable order | |
2649 | */ | |
2650 | static void reserve_highatomic_pageblock(struct page *page, struct zone *zone, | |
2651 | unsigned int alloc_order) | |
2652 | { | |
2653 | int mt; | |
2654 | unsigned long max_managed, flags; | |
2655 | ||
2656 | /* | |
2657 | * Limit the number reserved to 1 pageblock or roughly 1% of a zone. | |
2658 | * Check is race-prone but harmless. | |
2659 | */ | |
9705bea5 | 2660 | max_managed = (zone_managed_pages(zone) / 100) + pageblock_nr_pages; |
0aaa29a5 MG |
2661 | if (zone->nr_reserved_highatomic >= max_managed) |
2662 | return; | |
2663 | ||
2664 | spin_lock_irqsave(&zone->lock, flags); | |
2665 | ||
2666 | /* Recheck the nr_reserved_highatomic limit under the lock */ | |
2667 | if (zone->nr_reserved_highatomic >= max_managed) | |
2668 | goto out_unlock; | |
2669 | ||
2670 | /* Yoink! */ | |
2671 | mt = get_pageblock_migratetype(page); | |
a6ffdc07 XQ |
2672 | if (!is_migrate_highatomic(mt) && !is_migrate_isolate(mt) |
2673 | && !is_migrate_cma(mt)) { | |
0aaa29a5 MG |
2674 | zone->nr_reserved_highatomic += pageblock_nr_pages; |
2675 | set_pageblock_migratetype(page, MIGRATE_HIGHATOMIC); | |
02aa0cdd | 2676 | move_freepages_block(zone, page, MIGRATE_HIGHATOMIC, NULL); |
0aaa29a5 MG |
2677 | } |
2678 | ||
2679 | out_unlock: | |
2680 | spin_unlock_irqrestore(&zone->lock, flags); | |
2681 | } | |
2682 | ||
2683 | /* | |
2684 | * Used when an allocation is about to fail under memory pressure. This | |
2685 | * potentially hurts the reliability of high-order allocations when under | |
2686 | * intense memory pressure but failed atomic allocations should be easier | |
2687 | * to recover from than an OOM. | |
29fac03b MK |
2688 | * |
2689 | * If @force is true, try to unreserve a pageblock even though highatomic | |
2690 | * pageblock is exhausted. | |
0aaa29a5 | 2691 | */ |
29fac03b MK |
2692 | static bool unreserve_highatomic_pageblock(const struct alloc_context *ac, |
2693 | bool force) | |
0aaa29a5 MG |
2694 | { |
2695 | struct zonelist *zonelist = ac->zonelist; | |
2696 | unsigned long flags; | |
2697 | struct zoneref *z; | |
2698 | struct zone *zone; | |
2699 | struct page *page; | |
2700 | int order; | |
04c8716f | 2701 | bool ret; |
0aaa29a5 | 2702 | |
97a225e6 | 2703 | for_each_zone_zonelist_nodemask(zone, z, zonelist, ac->highest_zoneidx, |
0aaa29a5 | 2704 | ac->nodemask) { |
29fac03b MK |
2705 | /* |
2706 | * Preserve at least one pageblock unless memory pressure | |
2707 | * is really high. | |
2708 | */ | |
2709 | if (!force && zone->nr_reserved_highatomic <= | |
2710 | pageblock_nr_pages) | |
0aaa29a5 MG |
2711 | continue; |
2712 | ||
2713 | spin_lock_irqsave(&zone->lock, flags); | |
2714 | for (order = 0; order < MAX_ORDER; order++) { | |
2715 | struct free_area *area = &(zone->free_area[order]); | |
2716 | ||
b03641af | 2717 | page = get_page_from_free_area(area, MIGRATE_HIGHATOMIC); |
a16601c5 | 2718 | if (!page) |
0aaa29a5 MG |
2719 | continue; |
2720 | ||
0aaa29a5 | 2721 | /* |
4855e4a7 MK |
2722 | * In page freeing path, migratetype change is racy so |
2723 | * we can counter several free pages in a pageblock | |
2724 | * in this loop althoug we changed the pageblock type | |
2725 | * from highatomic to ac->migratetype. So we should | |
2726 | * adjust the count once. | |
0aaa29a5 | 2727 | */ |
a6ffdc07 | 2728 | if (is_migrate_highatomic_page(page)) { |
4855e4a7 MK |
2729 | /* |
2730 | * It should never happen but changes to | |
2731 | * locking could inadvertently allow a per-cpu | |
2732 | * drain to add pages to MIGRATE_HIGHATOMIC | |
2733 | * while unreserving so be safe and watch for | |
2734 | * underflows. | |
2735 | */ | |
2736 | zone->nr_reserved_highatomic -= min( | |
2737 | pageblock_nr_pages, | |
2738 | zone->nr_reserved_highatomic); | |
2739 | } | |
0aaa29a5 MG |
2740 | |
2741 | /* | |
2742 | * Convert to ac->migratetype and avoid the normal | |
2743 | * pageblock stealing heuristics. Minimally, the caller | |
2744 | * is doing the work and needs the pages. More | |
2745 | * importantly, if the block was always converted to | |
2746 | * MIGRATE_UNMOVABLE or another type then the number | |
2747 | * of pageblocks that cannot be completely freed | |
2748 | * may increase. | |
2749 | */ | |
2750 | set_pageblock_migratetype(page, ac->migratetype); | |
02aa0cdd VB |
2751 | ret = move_freepages_block(zone, page, ac->migratetype, |
2752 | NULL); | |
29fac03b MK |
2753 | if (ret) { |
2754 | spin_unlock_irqrestore(&zone->lock, flags); | |
2755 | return ret; | |
2756 | } | |
0aaa29a5 MG |
2757 | } |
2758 | spin_unlock_irqrestore(&zone->lock, flags); | |
2759 | } | |
04c8716f MK |
2760 | |
2761 | return false; | |
0aaa29a5 MG |
2762 | } |
2763 | ||
3bc48f96 VB |
2764 | /* |
2765 | * Try finding a free buddy page on the fallback list and put it on the free | |
2766 | * list of requested migratetype, possibly along with other pages from the same | |
2767 | * block, depending on fragmentation avoidance heuristics. Returns true if | |
2768 | * fallback was found so that __rmqueue_smallest() can grab it. | |
b002529d RV |
2769 | * |
2770 | * The use of signed ints for order and current_order is a deliberate | |
2771 | * deviation from the rest of this file, to make the for loop | |
2772 | * condition simpler. | |
3bc48f96 | 2773 | */ |
85ccc8fa | 2774 | static __always_inline bool |
6bb15450 MG |
2775 | __rmqueue_fallback(struct zone *zone, int order, int start_migratetype, |
2776 | unsigned int alloc_flags) | |
b2a0ac88 | 2777 | { |
b8af2941 | 2778 | struct free_area *area; |
b002529d | 2779 | int current_order; |
6bb15450 | 2780 | int min_order = order; |
b2a0ac88 | 2781 | struct page *page; |
4eb7dce6 JK |
2782 | int fallback_mt; |
2783 | bool can_steal; | |
b2a0ac88 | 2784 | |
6bb15450 MG |
2785 | /* |
2786 | * Do not steal pages from freelists belonging to other pageblocks | |
2787 | * i.e. orders < pageblock_order. If there are no local zones free, | |
2788 | * the zonelists will be reiterated without ALLOC_NOFRAGMENT. | |
2789 | */ | |
2790 | if (alloc_flags & ALLOC_NOFRAGMENT) | |
2791 | min_order = pageblock_order; | |
2792 | ||
7a8f58f3 VB |
2793 | /* |
2794 | * Find the largest available free page in the other list. This roughly | |
2795 | * approximates finding the pageblock with the most free pages, which | |
2796 | * would be too costly to do exactly. | |
2797 | */ | |
6bb15450 | 2798 | for (current_order = MAX_ORDER - 1; current_order >= min_order; |
7aeb09f9 | 2799 | --current_order) { |
4eb7dce6 JK |
2800 | area = &(zone->free_area[current_order]); |
2801 | fallback_mt = find_suitable_fallback(area, current_order, | |
2149cdae | 2802 | start_migratetype, false, &can_steal); |
4eb7dce6 JK |
2803 | if (fallback_mt == -1) |
2804 | continue; | |
b2a0ac88 | 2805 | |
7a8f58f3 VB |
2806 | /* |
2807 | * We cannot steal all free pages from the pageblock and the | |
2808 | * requested migratetype is movable. In that case it's better to | |
2809 | * steal and split the smallest available page instead of the | |
2810 | * largest available page, because even if the next movable | |
2811 | * allocation falls back into a different pageblock than this | |
2812 | * one, it won't cause permanent fragmentation. | |
2813 | */ | |
2814 | if (!can_steal && start_migratetype == MIGRATE_MOVABLE | |
2815 | && current_order > order) | |
2816 | goto find_smallest; | |
b2a0ac88 | 2817 | |
7a8f58f3 VB |
2818 | goto do_steal; |
2819 | } | |
e0fff1bd | 2820 | |
7a8f58f3 | 2821 | return false; |
e0fff1bd | 2822 | |
7a8f58f3 VB |
2823 | find_smallest: |
2824 | for (current_order = order; current_order < MAX_ORDER; | |
2825 | current_order++) { | |
2826 | area = &(zone->free_area[current_order]); | |
2827 | fallback_mt = find_suitable_fallback(area, current_order, | |
2828 | start_migratetype, false, &can_steal); | |
2829 | if (fallback_mt != -1) | |
2830 | break; | |
b2a0ac88 MG |
2831 | } |
2832 | ||
7a8f58f3 VB |
2833 | /* |
2834 | * This should not happen - we already found a suitable fallback | |
2835 | * when looking for the largest page. | |
2836 | */ | |
2837 | VM_BUG_ON(current_order == MAX_ORDER); | |
2838 | ||
2839 | do_steal: | |
b03641af | 2840 | page = get_page_from_free_area(area, fallback_mt); |
7a8f58f3 | 2841 | |
1c30844d MG |
2842 | steal_suitable_fallback(zone, page, alloc_flags, start_migratetype, |
2843 | can_steal); | |
7a8f58f3 VB |
2844 | |
2845 | trace_mm_page_alloc_extfrag(page, order, current_order, | |
2846 | start_migratetype, fallback_mt); | |
2847 | ||
2848 | return true; | |
2849 | ||
b2a0ac88 MG |
2850 | } |
2851 | ||
56fd56b8 | 2852 | /* |
1da177e4 LT |
2853 | * Do the hard work of removing an element from the buddy allocator. |
2854 | * Call me with the zone->lock already held. | |
2855 | */ | |
85ccc8fa | 2856 | static __always_inline struct page * |
6bb15450 MG |
2857 | __rmqueue(struct zone *zone, unsigned int order, int migratetype, |
2858 | unsigned int alloc_flags) | |
1da177e4 | 2859 | { |
1da177e4 LT |
2860 | struct page *page; |
2861 | ||
ce8f86ee H |
2862 | if (IS_ENABLED(CONFIG_CMA)) { |
2863 | /* | |
2864 | * Balance movable allocations between regular and CMA areas by | |
2865 | * allocating from CMA when over half of the zone's free memory | |
2866 | * is in the CMA area. | |
2867 | */ | |
2868 | if (alloc_flags & ALLOC_CMA && | |
2869 | zone_page_state(zone, NR_FREE_CMA_PAGES) > | |
2870 | zone_page_state(zone, NR_FREE_PAGES) / 2) { | |
2871 | page = __rmqueue_cma_fallback(zone, order); | |
2872 | if (page) | |
2873 | goto out; | |
2874 | } | |
16867664 | 2875 | } |
3bc48f96 | 2876 | retry: |
56fd56b8 | 2877 | page = __rmqueue_smallest(zone, order, migratetype); |
974a786e | 2878 | if (unlikely(!page)) { |
8510e69c | 2879 | if (alloc_flags & ALLOC_CMA) |
dc67647b JK |
2880 | page = __rmqueue_cma_fallback(zone, order); |
2881 | ||
6bb15450 MG |
2882 | if (!page && __rmqueue_fallback(zone, order, migratetype, |
2883 | alloc_flags)) | |
3bc48f96 | 2884 | goto retry; |
728ec980 | 2885 | } |
ce8f86ee H |
2886 | out: |
2887 | if (page) | |
2888 | trace_mm_page_alloc_zone_locked(page, order, migratetype); | |
b2a0ac88 | 2889 | return page; |
1da177e4 LT |
2890 | } |
2891 | ||
5f63b720 | 2892 | /* |
1da177e4 LT |
2893 | * Obtain a specified number of elements from the buddy allocator, all under |
2894 | * a single hold of the lock, for efficiency. Add them to the supplied list. | |
2895 | * Returns the number of new pages which were placed at *list. | |
2896 | */ | |
5f63b720 | 2897 | static int rmqueue_bulk(struct zone *zone, unsigned int order, |
b2a0ac88 | 2898 | unsigned long count, struct list_head *list, |
6bb15450 | 2899 | int migratetype, unsigned int alloc_flags) |
1da177e4 | 2900 | { |
a6de734b | 2901 | int i, alloced = 0; |
5f63b720 | 2902 | |
d34b0733 | 2903 | spin_lock(&zone->lock); |
1da177e4 | 2904 | for (i = 0; i < count; ++i) { |
6bb15450 MG |
2905 | struct page *page = __rmqueue(zone, order, migratetype, |
2906 | alloc_flags); | |
085cc7d5 | 2907 | if (unlikely(page == NULL)) |
1da177e4 | 2908 | break; |
81eabcbe | 2909 | |
479f854a MG |
2910 | if (unlikely(check_pcp_refill(page))) |
2911 | continue; | |
2912 | ||
81eabcbe | 2913 | /* |
0fac3ba5 VB |
2914 | * Split buddy pages returned by expand() are received here in |
2915 | * physical page order. The page is added to the tail of | |
2916 | * caller's list. From the callers perspective, the linked list | |
2917 | * is ordered by page number under some conditions. This is | |
2918 | * useful for IO devices that can forward direction from the | |
2919 | * head, thus also in the physical page order. This is useful | |
2920 | * for IO devices that can merge IO requests if the physical | |
2921 | * pages are ordered properly. | |
81eabcbe | 2922 | */ |
0fac3ba5 | 2923 | list_add_tail(&page->lru, list); |
a6de734b | 2924 | alloced++; |
bb14c2c7 | 2925 | if (is_migrate_cma(get_pcppage_migratetype(page))) |
d1ce749a BZ |
2926 | __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, |
2927 | -(1 << order)); | |
1da177e4 | 2928 | } |
a6de734b MG |
2929 | |
2930 | /* | |
2931 | * i pages were removed from the buddy list even if some leak due | |
2932 | * to check_pcp_refill failing so adjust NR_FREE_PAGES based | |
2933 | * on i. Do not confuse with 'alloced' which is the number of | |
2934 | * pages added to the pcp list. | |
2935 | */ | |
f2260e6b | 2936 | __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order)); |
d34b0733 | 2937 | spin_unlock(&zone->lock); |
a6de734b | 2938 | return alloced; |
1da177e4 LT |
2939 | } |
2940 | ||
4ae7c039 | 2941 | #ifdef CONFIG_NUMA |
8fce4d8e | 2942 | /* |
4037d452 CL |
2943 | * Called from the vmstat counter updater to drain pagesets of this |
2944 | * currently executing processor on remote nodes after they have | |
2945 | * expired. | |
2946 | * | |
879336c3 CL |
2947 | * Note that this function must be called with the thread pinned to |
2948 | * a single processor. | |
8fce4d8e | 2949 | */ |
4037d452 | 2950 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) |
4ae7c039 | 2951 | { |
4ae7c039 | 2952 | unsigned long flags; |
7be12fc9 | 2953 | int to_drain, batch; |
4ae7c039 | 2954 | |
4037d452 | 2955 | local_irq_save(flags); |
4db0c3c2 | 2956 | batch = READ_ONCE(pcp->batch); |
7be12fc9 | 2957 | to_drain = min(pcp->count, batch); |
77ba9062 | 2958 | if (to_drain > 0) |
2a13515c | 2959 | free_pcppages_bulk(zone, to_drain, pcp); |
4037d452 | 2960 | local_irq_restore(flags); |
4ae7c039 CL |
2961 | } |
2962 | #endif | |
2963 | ||
9f8f2172 | 2964 | /* |
93481ff0 | 2965 | * Drain pcplists of the indicated processor and zone. |
9f8f2172 CL |
2966 | * |
2967 | * The processor must either be the current processor and the | |
2968 | * thread pinned to the current processor or a processor that | |
2969 | * is not online. | |
2970 | */ | |
93481ff0 | 2971 | static void drain_pages_zone(unsigned int cpu, struct zone *zone) |
1da177e4 | 2972 | { |
c54ad30c | 2973 | unsigned long flags; |
93481ff0 VB |
2974 | struct per_cpu_pageset *pset; |
2975 | struct per_cpu_pages *pcp; | |
1da177e4 | 2976 | |
93481ff0 VB |
2977 | local_irq_save(flags); |
2978 | pset = per_cpu_ptr(zone->pageset, cpu); | |
1da177e4 | 2979 | |
93481ff0 | 2980 | pcp = &pset->pcp; |
77ba9062 | 2981 | if (pcp->count) |
93481ff0 | 2982 | free_pcppages_bulk(zone, pcp->count, pcp); |
93481ff0 VB |
2983 | local_irq_restore(flags); |
2984 | } | |
3dfa5721 | 2985 | |
93481ff0 VB |
2986 | /* |
2987 | * Drain pcplists of all zones on the indicated processor. | |
2988 | * | |
2989 | * The processor must either be the current processor and the | |
2990 | * thread pinned to the current processor or a processor that | |
2991 | * is not online. | |
2992 | */ | |
2993 | static void drain_pages(unsigned int cpu) | |
2994 | { | |
2995 | struct zone *zone; | |
2996 | ||
2997 | for_each_populated_zone(zone) { | |
2998 | drain_pages_zone(cpu, zone); | |
1da177e4 LT |
2999 | } |
3000 | } | |
1da177e4 | 3001 | |
9f8f2172 CL |
3002 | /* |
3003 | * Spill all of this CPU's per-cpu pages back into the buddy allocator. | |
93481ff0 VB |
3004 | * |
3005 | * The CPU has to be pinned. When zone parameter is non-NULL, spill just | |
3006 | * the single zone's pages. | |
9f8f2172 | 3007 | */ |
93481ff0 | 3008 | void drain_local_pages(struct zone *zone) |
9f8f2172 | 3009 | { |
93481ff0 VB |
3010 | int cpu = smp_processor_id(); |
3011 | ||
3012 | if (zone) | |
3013 | drain_pages_zone(cpu, zone); | |
3014 | else | |
3015 | drain_pages(cpu); | |
9f8f2172 CL |
3016 | } |
3017 | ||
0ccce3b9 MG |
3018 | static void drain_local_pages_wq(struct work_struct *work) |
3019 | { | |
d9367bd0 WY |
3020 | struct pcpu_drain *drain; |
3021 | ||
3022 | drain = container_of(work, struct pcpu_drain, work); | |
3023 | ||
a459eeb7 MH |
3024 | /* |
3025 | * drain_all_pages doesn't use proper cpu hotplug protection so | |
3026 | * we can race with cpu offline when the WQ can move this from | |
3027 | * a cpu pinned worker to an unbound one. We can operate on a different | |
3028 | * cpu which is allright but we also have to make sure to not move to | |
3029 | * a different one. | |
3030 | */ | |
3031 | preempt_disable(); | |
d9367bd0 | 3032 | drain_local_pages(drain->zone); |
a459eeb7 | 3033 | preempt_enable(); |
0ccce3b9 MG |
3034 | } |
3035 | ||
9f8f2172 | 3036 | /* |
ec6e8c7e VB |
3037 | * The implementation of drain_all_pages(), exposing an extra parameter to |
3038 | * drain on all cpus. | |
93481ff0 | 3039 | * |
ec6e8c7e VB |
3040 | * drain_all_pages() is optimized to only execute on cpus where pcplists are |
3041 | * not empty. The check for non-emptiness can however race with a free to | |
3042 | * pcplist that has not yet increased the pcp->count from 0 to 1. Callers | |
3043 | * that need the guarantee that every CPU has drained can disable the | |
3044 | * optimizing racy check. | |
9f8f2172 | 3045 | */ |
3b1f3658 | 3046 | static void __drain_all_pages(struct zone *zone, bool force_all_cpus) |
9f8f2172 | 3047 | { |
74046494 | 3048 | int cpu; |
74046494 GBY |
3049 | |
3050 | /* | |
3051 | * Allocate in the BSS so we wont require allocation in | |
3052 | * direct reclaim path for CONFIG_CPUMASK_OFFSTACK=y | |
3053 | */ | |
3054 | static cpumask_t cpus_with_pcps; | |
3055 | ||
ce612879 MH |
3056 | /* |
3057 | * Make sure nobody triggers this path before mm_percpu_wq is fully | |
3058 | * initialized. | |
3059 | */ | |
3060 | if (WARN_ON_ONCE(!mm_percpu_wq)) | |
3061 | return; | |
3062 | ||
bd233f53 MG |
3063 | /* |
3064 | * Do not drain if one is already in progress unless it's specific to | |
3065 | * a zone. Such callers are primarily CMA and memory hotplug and need | |
3066 | * the drain to be complete when the call returns. | |
3067 | */ | |
3068 | if (unlikely(!mutex_trylock(&pcpu_drain_mutex))) { | |
3069 | if (!zone) | |
3070 | return; | |
3071 | mutex_lock(&pcpu_drain_mutex); | |
3072 | } | |
0ccce3b9 | 3073 | |
74046494 GBY |
3074 | /* |
3075 | * We don't care about racing with CPU hotplug event | |
3076 | * as offline notification will cause the notified | |
3077 | * cpu to drain that CPU pcps and on_each_cpu_mask | |
3078 | * disables preemption as part of its processing | |
3079 | */ | |
3080 | for_each_online_cpu(cpu) { | |
93481ff0 VB |
3081 | struct per_cpu_pageset *pcp; |
3082 | struct zone *z; | |
74046494 | 3083 | bool has_pcps = false; |
93481ff0 | 3084 | |
ec6e8c7e VB |
3085 | if (force_all_cpus) { |
3086 | /* | |
3087 | * The pcp.count check is racy, some callers need a | |
3088 | * guarantee that no cpu is missed. | |
3089 | */ | |
3090 | has_pcps = true; | |
3091 | } else if (zone) { | |
74046494 | 3092 | pcp = per_cpu_ptr(zone->pageset, cpu); |
93481ff0 | 3093 | if (pcp->pcp.count) |
74046494 | 3094 | has_pcps = true; |
93481ff0 VB |
3095 | } else { |
3096 | for_each_populated_zone(z) { | |
3097 | pcp = per_cpu_ptr(z->pageset, cpu); | |
3098 | if (pcp->pcp.count) { | |
3099 | has_pcps = true; | |
3100 | break; | |
3101 | } | |
74046494 GBY |
3102 | } |
3103 | } | |
93481ff0 | 3104 | |
74046494 GBY |
3105 | if (has_pcps) |
3106 | cpumask_set_cpu(cpu, &cpus_with_pcps); | |
3107 | else | |
3108 | cpumask_clear_cpu(cpu, &cpus_with_pcps); | |
3109 | } | |
0ccce3b9 | 3110 | |
bd233f53 | 3111 | for_each_cpu(cpu, &cpus_with_pcps) { |
d9367bd0 WY |
3112 | struct pcpu_drain *drain = per_cpu_ptr(&pcpu_drain, cpu); |
3113 | ||
3114 | drain->zone = zone; | |
3115 | INIT_WORK(&drain->work, drain_local_pages_wq); | |
3116 | queue_work_on(cpu, mm_percpu_wq, &drain->work); | |
0ccce3b9 | 3117 | } |
bd233f53 | 3118 | for_each_cpu(cpu, &cpus_with_pcps) |
d9367bd0 | 3119 | flush_work(&per_cpu_ptr(&pcpu_drain, cpu)->work); |
bd233f53 MG |
3120 | |
3121 | mutex_unlock(&pcpu_drain_mutex); | |
9f8f2172 CL |
3122 | } |
3123 | ||
ec6e8c7e VB |
3124 | /* |
3125 | * Spill all the per-cpu pages from all CPUs back into the buddy allocator. | |
3126 | * | |
3127 | * When zone parameter is non-NULL, spill just the single zone's pages. | |
3128 | * | |
3129 | * Note that this can be extremely slow as the draining happens in a workqueue. | |
3130 | */ | |
3131 | void drain_all_pages(struct zone *zone) | |
3132 | { | |
3133 | __drain_all_pages(zone, false); | |
3134 | } | |
3135 | ||
296699de | 3136 | #ifdef CONFIG_HIBERNATION |
1da177e4 | 3137 | |
556b969a CY |
3138 | /* |
3139 | * Touch the watchdog for every WD_PAGE_COUNT pages. | |
3140 | */ | |
3141 | #define WD_PAGE_COUNT (128*1024) | |
3142 | ||
1da177e4 LT |
3143 | void mark_free_pages(struct zone *zone) |
3144 | { | |
556b969a | 3145 | unsigned long pfn, max_zone_pfn, page_count = WD_PAGE_COUNT; |
f623f0db | 3146 | unsigned long flags; |
7aeb09f9 | 3147 | unsigned int order, t; |
86760a2c | 3148 | struct page *page; |
1da177e4 | 3149 | |
8080fc03 | 3150 | if (zone_is_empty(zone)) |
1da177e4 LT |
3151 | return; |
3152 | ||
3153 | spin_lock_irqsave(&zone->lock, flags); | |
f623f0db | 3154 | |
108bcc96 | 3155 | max_zone_pfn = zone_end_pfn(zone); |
f623f0db RW |
3156 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
3157 | if (pfn_valid(pfn)) { | |
86760a2c | 3158 | page = pfn_to_page(pfn); |
ba6b0979 | 3159 | |
556b969a CY |
3160 | if (!--page_count) { |
3161 | touch_nmi_watchdog(); | |
3162 | page_count = WD_PAGE_COUNT; | |
3163 | } | |
3164 | ||
ba6b0979 JK |
3165 | if (page_zone(page) != zone) |
3166 | continue; | |
3167 | ||
7be98234 RW |
3168 | if (!swsusp_page_is_forbidden(page)) |
3169 | swsusp_unset_page_free(page); | |
f623f0db | 3170 | } |
1da177e4 | 3171 | |
b2a0ac88 | 3172 | for_each_migratetype_order(order, t) { |
86760a2c GT |
3173 | list_for_each_entry(page, |
3174 | &zone->free_area[order].free_list[t], lru) { | |
f623f0db | 3175 | unsigned long i; |
1da177e4 | 3176 | |
86760a2c | 3177 | pfn = page_to_pfn(page); |
556b969a CY |
3178 | for (i = 0; i < (1UL << order); i++) { |
3179 | if (!--page_count) { | |
3180 | touch_nmi_watchdog(); | |
3181 | page_count = WD_PAGE_COUNT; | |
3182 | } | |
7be98234 | 3183 | swsusp_set_page_free(pfn_to_page(pfn + i)); |
556b969a | 3184 | } |
f623f0db | 3185 | } |
b2a0ac88 | 3186 | } |
1da177e4 LT |
3187 | spin_unlock_irqrestore(&zone->lock, flags); |
3188 | } | |
e2c55dc8 | 3189 | #endif /* CONFIG_PM */ |
1da177e4 | 3190 | |
2d4894b5 | 3191 | static bool free_unref_page_prepare(struct page *page, unsigned long pfn) |
1da177e4 | 3192 | { |
5f8dcc21 | 3193 | int migratetype; |
1da177e4 | 3194 | |
4db7548c | 3195 | if (!free_pcp_prepare(page)) |
9cca35d4 | 3196 | return false; |
689bcebf | 3197 | |
dc4b0caf | 3198 | migratetype = get_pfnblock_migratetype(page, pfn); |
bb14c2c7 | 3199 | set_pcppage_migratetype(page, migratetype); |
9cca35d4 MG |
3200 | return true; |
3201 | } | |
3202 | ||
2d4894b5 | 3203 | static void free_unref_page_commit(struct page *page, unsigned long pfn) |
9cca35d4 MG |
3204 | { |
3205 | struct zone *zone = page_zone(page); | |
3206 | struct per_cpu_pages *pcp; | |
3207 | int migratetype; | |
3208 | ||
3209 | migratetype = get_pcppage_migratetype(page); | |
d34b0733 | 3210 | __count_vm_event(PGFREE); |
da456f14 | 3211 | |
5f8dcc21 MG |
3212 | /* |
3213 | * We only track unmovable, reclaimable and movable on pcp lists. | |
3214 | * Free ISOLATE pages back to the allocator because they are being | |
a6ffdc07 | 3215 | * offlined but treat HIGHATOMIC as movable pages so we can get those |
5f8dcc21 MG |
3216 | * areas back if necessary. Otherwise, we may have to free |
3217 | * excessively into the page allocator | |
3218 | */ | |
3219 | if (migratetype >= MIGRATE_PCPTYPES) { | |
194159fb | 3220 | if (unlikely(is_migrate_isolate(migratetype))) { |
7fef431b DH |
3221 | free_one_page(zone, page, pfn, 0, migratetype, |
3222 | FPI_NONE); | |
9cca35d4 | 3223 | return; |
5f8dcc21 MG |
3224 | } |
3225 | migratetype = MIGRATE_MOVABLE; | |
3226 | } | |
3227 | ||
99dcc3e5 | 3228 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
2d4894b5 | 3229 | list_add(&page->lru, &pcp->lists[migratetype]); |
1da177e4 | 3230 | pcp->count++; |
5c3ad2eb VB |
3231 | if (pcp->count >= READ_ONCE(pcp->high)) |
3232 | free_pcppages_bulk(zone, READ_ONCE(pcp->batch), pcp); | |
9cca35d4 | 3233 | } |
5f8dcc21 | 3234 | |
9cca35d4 MG |
3235 | /* |
3236 | * Free a 0-order page | |
9cca35d4 | 3237 | */ |
2d4894b5 | 3238 | void free_unref_page(struct page *page) |
9cca35d4 MG |
3239 | { |
3240 | unsigned long flags; | |
3241 | unsigned long pfn = page_to_pfn(page); | |
3242 | ||
2d4894b5 | 3243 | if (!free_unref_page_prepare(page, pfn)) |
9cca35d4 MG |
3244 | return; |
3245 | ||
3246 | local_irq_save(flags); | |
2d4894b5 | 3247 | free_unref_page_commit(page, pfn); |
d34b0733 | 3248 | local_irq_restore(flags); |
1da177e4 LT |
3249 | } |
3250 | ||
cc59850e KK |
3251 | /* |
3252 | * Free a list of 0-order pages | |
3253 | */ | |
2d4894b5 | 3254 | void free_unref_page_list(struct list_head *list) |
cc59850e KK |
3255 | { |
3256 | struct page *page, *next; | |
9cca35d4 | 3257 | unsigned long flags, pfn; |
c24ad77d | 3258 | int batch_count = 0; |
9cca35d4 MG |
3259 | |
3260 | /* Prepare pages for freeing */ | |
3261 | list_for_each_entry_safe(page, next, list, lru) { | |
3262 | pfn = page_to_pfn(page); | |
2d4894b5 | 3263 | if (!free_unref_page_prepare(page, pfn)) |
9cca35d4 MG |
3264 | list_del(&page->lru); |
3265 | set_page_private(page, pfn); | |
3266 | } | |
cc59850e | 3267 | |
9cca35d4 | 3268 | local_irq_save(flags); |
cc59850e | 3269 | list_for_each_entry_safe(page, next, list, lru) { |
9cca35d4 MG |
3270 | unsigned long pfn = page_private(page); |
3271 | ||
3272 | set_page_private(page, 0); | |
2d4894b5 MG |
3273 | trace_mm_page_free_batched(page); |
3274 | free_unref_page_commit(page, pfn); | |
c24ad77d LS |
3275 | |
3276 | /* | |
3277 | * Guard against excessive IRQ disabled times when we get | |
3278 | * a large list of pages to free. | |
3279 | */ | |
3280 | if (++batch_count == SWAP_CLUSTER_MAX) { | |
3281 | local_irq_restore(flags); | |
3282 | batch_count = 0; | |
3283 | local_irq_save(flags); | |
3284 | } | |
cc59850e | 3285 | } |
9cca35d4 | 3286 | local_irq_restore(flags); |
cc59850e KK |
3287 | } |
3288 | ||
8dfcc9ba NP |
3289 | /* |
3290 | * split_page takes a non-compound higher-order page, and splits it into | |
3291 | * n (1<<order) sub-pages: page[0..n] | |
3292 | * Each sub-page must be freed individually. | |
3293 | * | |
3294 | * Note: this is probably too low level an operation for use in drivers. | |
3295 | * Please consult with lkml before using this in your driver. | |
3296 | */ | |
3297 | void split_page(struct page *page, unsigned int order) | |
3298 | { | |
3299 | int i; | |
3300 | ||
309381fe SL |
3301 | VM_BUG_ON_PAGE(PageCompound(page), page); |
3302 | VM_BUG_ON_PAGE(!page_count(page), page); | |
b1eeab67 | 3303 | |
a9627bc5 | 3304 | for (i = 1; i < (1 << order); i++) |
7835e98b | 3305 | set_page_refcounted(page + i); |
8fb156c9 | 3306 | split_page_owner(page, 1 << order); |
b0ee955e | 3307 | split_page_memcg(page, 1 << order); |
8dfcc9ba | 3308 | } |
5853ff23 | 3309 | EXPORT_SYMBOL_GPL(split_page); |
8dfcc9ba | 3310 | |
3c605096 | 3311 | int __isolate_free_page(struct page *page, unsigned int order) |
748446bb | 3312 | { |
748446bb MG |
3313 | unsigned long watermark; |
3314 | struct zone *zone; | |
2139cbe6 | 3315 | int mt; |
748446bb MG |
3316 | |
3317 | BUG_ON(!PageBuddy(page)); | |
3318 | ||
3319 | zone = page_zone(page); | |
2e30abd1 | 3320 | mt = get_pageblock_migratetype(page); |
748446bb | 3321 | |
194159fb | 3322 | if (!is_migrate_isolate(mt)) { |
8348faf9 VB |
3323 | /* |
3324 | * Obey watermarks as if the page was being allocated. We can | |
3325 | * emulate a high-order watermark check with a raised order-0 | |
3326 | * watermark, because we already know our high-order page | |
3327 | * exists. | |
3328 | */ | |
fd1444b2 | 3329 | watermark = zone->_watermark[WMARK_MIN] + (1UL << order); |
d883c6cf | 3330 | if (!zone_watermark_ok(zone, 0, watermark, 0, ALLOC_CMA)) |
2e30abd1 MS |
3331 | return 0; |
3332 | ||
8fb74b9f | 3333 | __mod_zone_freepage_state(zone, -(1UL << order), mt); |
2e30abd1 | 3334 | } |
748446bb MG |
3335 | |
3336 | /* Remove page from free list */ | |
b03641af | 3337 | |
6ab01363 | 3338 | del_page_from_free_list(page, zone, order); |
2139cbe6 | 3339 | |
400bc7fd | 3340 | /* |
3341 | * Set the pageblock if the isolated page is at least half of a | |
3342 | * pageblock | |
3343 | */ | |
748446bb MG |
3344 | if (order >= pageblock_order - 1) { |
3345 | struct page *endpage = page + (1 << order) - 1; | |
47118af0 MN |
3346 | for (; page < endpage; page += pageblock_nr_pages) { |
3347 | int mt = get_pageblock_migratetype(page); | |
88ed365e | 3348 | if (!is_migrate_isolate(mt) && !is_migrate_cma(mt) |
a6ffdc07 | 3349 | && !is_migrate_highatomic(mt)) |
47118af0 MN |
3350 | set_pageblock_migratetype(page, |
3351 | MIGRATE_MOVABLE); | |
3352 | } | |
748446bb MG |
3353 | } |
3354 | ||
f3a14ced | 3355 | |
8fb74b9f | 3356 | return 1UL << order; |
1fb3f8ca MG |
3357 | } |
3358 | ||
624f58d8 AD |
3359 | /** |
3360 | * __putback_isolated_page - Return a now-isolated page back where we got it | |
3361 | * @page: Page that was isolated | |
3362 | * @order: Order of the isolated page | |
e6a0a7ad | 3363 | * @mt: The page's pageblock's migratetype |
624f58d8 AD |
3364 | * |
3365 | * This function is meant to return a page pulled from the free lists via | |
3366 | * __isolate_free_page back to the free lists they were pulled from. | |
3367 | */ | |
3368 | void __putback_isolated_page(struct page *page, unsigned int order, int mt) | |
3369 | { | |
3370 | struct zone *zone = page_zone(page); | |
3371 | ||
3372 | /* zone lock should be held when this function is called */ | |
3373 | lockdep_assert_held(&zone->lock); | |
3374 | ||
3375 | /* Return isolated page to tail of freelist. */ | |
f04a5d5d | 3376 | __free_one_page(page, page_to_pfn(page), zone, order, mt, |
47b6a24a | 3377 | FPI_SKIP_REPORT_NOTIFY | FPI_TO_TAIL); |
624f58d8 AD |
3378 | } |
3379 | ||
060e7417 MG |
3380 | /* |
3381 | * Update NUMA hit/miss statistics | |
3382 | * | |
3383 | * Must be called with interrupts disabled. | |
060e7417 | 3384 | */ |
41b6167e | 3385 | static inline void zone_statistics(struct zone *preferred_zone, struct zone *z) |
060e7417 MG |
3386 | { |
3387 | #ifdef CONFIG_NUMA | |
3a321d2a | 3388 | enum numa_stat_item local_stat = NUMA_LOCAL; |
060e7417 | 3389 | |
4518085e KW |
3390 | /* skip numa counters update if numa stats is disabled */ |
3391 | if (!static_branch_likely(&vm_numa_stat_key)) | |
3392 | return; | |
3393 | ||
c1093b74 | 3394 | if (zone_to_nid(z) != numa_node_id()) |
060e7417 | 3395 | local_stat = NUMA_OTHER; |
060e7417 | 3396 | |
c1093b74 | 3397 | if (zone_to_nid(z) == zone_to_nid(preferred_zone)) |
3a321d2a | 3398 | __inc_numa_state(z, NUMA_HIT); |
2df26639 | 3399 | else { |
3a321d2a KW |
3400 | __inc_numa_state(z, NUMA_MISS); |
3401 | __inc_numa_state(preferred_zone, NUMA_FOREIGN); | |
060e7417 | 3402 | } |
3a321d2a | 3403 | __inc_numa_state(z, local_stat); |
060e7417 MG |
3404 | #endif |
3405 | } | |
3406 | ||
066b2393 MG |
3407 | /* Remove page from the per-cpu list, caller must protect the list */ |
3408 | static struct page *__rmqueue_pcplist(struct zone *zone, int migratetype, | |
6bb15450 | 3409 | unsigned int alloc_flags, |
453f85d4 | 3410 | struct per_cpu_pages *pcp, |
066b2393 MG |
3411 | struct list_head *list) |
3412 | { | |
3413 | struct page *page; | |
3414 | ||
3415 | do { | |
3416 | if (list_empty(list)) { | |
3417 | pcp->count += rmqueue_bulk(zone, 0, | |
5c3ad2eb | 3418 | READ_ONCE(pcp->batch), list, |
6bb15450 | 3419 | migratetype, alloc_flags); |
066b2393 MG |
3420 | if (unlikely(list_empty(list))) |
3421 | return NULL; | |
3422 | } | |
3423 | ||
453f85d4 | 3424 | page = list_first_entry(list, struct page, lru); |
066b2393 MG |
3425 | list_del(&page->lru); |
3426 | pcp->count--; | |
3427 | } while (check_new_pcp(page)); | |
3428 | ||
3429 | return page; | |
3430 | } | |
3431 | ||
3432 | /* Lock and remove page from the per-cpu list */ | |
3433 | static struct page *rmqueue_pcplist(struct zone *preferred_zone, | |
1c52e6d0 YS |
3434 | struct zone *zone, gfp_t gfp_flags, |
3435 | int migratetype, unsigned int alloc_flags) | |
066b2393 MG |
3436 | { |
3437 | struct per_cpu_pages *pcp; | |
3438 | struct list_head *list; | |
066b2393 | 3439 | struct page *page; |
d34b0733 | 3440 | unsigned long flags; |
066b2393 | 3441 | |
d34b0733 | 3442 | local_irq_save(flags); |
066b2393 MG |
3443 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
3444 | list = &pcp->lists[migratetype]; | |
6bb15450 | 3445 | page = __rmqueue_pcplist(zone, migratetype, alloc_flags, pcp, list); |
066b2393 | 3446 | if (page) { |
1c52e6d0 | 3447 | __count_zid_vm_events(PGALLOC, page_zonenum(page), 1); |
066b2393 MG |
3448 | zone_statistics(preferred_zone, zone); |
3449 | } | |
d34b0733 | 3450 | local_irq_restore(flags); |
066b2393 MG |
3451 | return page; |
3452 | } | |
3453 | ||
1da177e4 | 3454 | /* |
75379191 | 3455 | * Allocate a page from the given zone. Use pcplists for order-0 allocations. |
1da177e4 | 3456 | */ |
0a15c3e9 | 3457 | static inline |
066b2393 | 3458 | struct page *rmqueue(struct zone *preferred_zone, |
7aeb09f9 | 3459 | struct zone *zone, unsigned int order, |
c603844b MG |
3460 | gfp_t gfp_flags, unsigned int alloc_flags, |
3461 | int migratetype) | |
1da177e4 LT |
3462 | { |
3463 | unsigned long flags; | |
689bcebf | 3464 | struct page *page; |
1da177e4 | 3465 | |
d34b0733 | 3466 | if (likely(order == 0)) { |
1d91df85 JK |
3467 | /* |
3468 | * MIGRATE_MOVABLE pcplist could have the pages on CMA area and | |
3469 | * we need to skip it when CMA area isn't allowed. | |
3470 | */ | |
3471 | if (!IS_ENABLED(CONFIG_CMA) || alloc_flags & ALLOC_CMA || | |
3472 | migratetype != MIGRATE_MOVABLE) { | |
3473 | page = rmqueue_pcplist(preferred_zone, zone, gfp_flags, | |
1c52e6d0 | 3474 | migratetype, alloc_flags); |
1d91df85 JK |
3475 | goto out; |
3476 | } | |
066b2393 | 3477 | } |
83b9355b | 3478 | |
066b2393 MG |
3479 | /* |
3480 | * We most definitely don't want callers attempting to | |
3481 | * allocate greater than order-1 page units with __GFP_NOFAIL. | |
3482 | */ | |
3483 | WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1)); | |
3484 | spin_lock_irqsave(&zone->lock, flags); | |
0aaa29a5 | 3485 | |
066b2393 MG |
3486 | do { |
3487 | page = NULL; | |
1d91df85 JK |
3488 | /* |
3489 | * order-0 request can reach here when the pcplist is skipped | |
3490 | * due to non-CMA allocation context. HIGHATOMIC area is | |
3491 | * reserved for high-order atomic allocation, so order-0 | |
3492 | * request should skip it. | |
3493 | */ | |
3494 | if (order > 0 && alloc_flags & ALLOC_HARDER) { | |
066b2393 MG |
3495 | page = __rmqueue_smallest(zone, order, MIGRATE_HIGHATOMIC); |
3496 | if (page) | |
3497 | trace_mm_page_alloc_zone_locked(page, order, migratetype); | |
3498 | } | |
a74609fa | 3499 | if (!page) |
6bb15450 | 3500 | page = __rmqueue(zone, order, migratetype, alloc_flags); |
066b2393 MG |
3501 | } while (page && check_new_pages(page, order)); |
3502 | spin_unlock(&zone->lock); | |
3503 | if (!page) | |
3504 | goto failed; | |
3505 | __mod_zone_freepage_state(zone, -(1 << order), | |
3506 | get_pcppage_migratetype(page)); | |
1da177e4 | 3507 | |
16709d1d | 3508 | __count_zid_vm_events(PGALLOC, page_zonenum(page), 1 << order); |
41b6167e | 3509 | zone_statistics(preferred_zone, zone); |
a74609fa | 3510 | local_irq_restore(flags); |
1da177e4 | 3511 | |
066b2393 | 3512 | out: |
73444bc4 MG |
3513 | /* Separate test+clear to avoid unnecessary atomics */ |
3514 | if (test_bit(ZONE_BOOSTED_WATERMARK, &zone->flags)) { | |
3515 | clear_bit(ZONE_BOOSTED_WATERMARK, &zone->flags); | |
3516 | wakeup_kswapd(zone, 0, 0, zone_idx(zone)); | |
3517 | } | |
3518 | ||
066b2393 | 3519 | VM_BUG_ON_PAGE(page && bad_range(zone, page), page); |
1da177e4 | 3520 | return page; |
a74609fa NP |
3521 | |
3522 | failed: | |
3523 | local_irq_restore(flags); | |
a74609fa | 3524 | return NULL; |
1da177e4 LT |
3525 | } |
3526 | ||
933e312e AM |
3527 | #ifdef CONFIG_FAIL_PAGE_ALLOC |
3528 | ||
b2588c4b | 3529 | static struct { |
933e312e AM |
3530 | struct fault_attr attr; |
3531 | ||
621a5f7a | 3532 | bool ignore_gfp_highmem; |
71baba4b | 3533 | bool ignore_gfp_reclaim; |
54114994 | 3534 | u32 min_order; |
933e312e AM |
3535 | } fail_page_alloc = { |
3536 | .attr = FAULT_ATTR_INITIALIZER, | |
71baba4b | 3537 | .ignore_gfp_reclaim = true, |
621a5f7a | 3538 | .ignore_gfp_highmem = true, |
54114994 | 3539 | .min_order = 1, |
933e312e AM |
3540 | }; |
3541 | ||
3542 | static int __init setup_fail_page_alloc(char *str) | |
3543 | { | |
3544 | return setup_fault_attr(&fail_page_alloc.attr, str); | |
3545 | } | |
3546 | __setup("fail_page_alloc=", setup_fail_page_alloc); | |
3547 | ||
af3b8544 | 3548 | static bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
933e312e | 3549 | { |
54114994 | 3550 | if (order < fail_page_alloc.min_order) |
deaf386e | 3551 | return false; |
933e312e | 3552 | if (gfp_mask & __GFP_NOFAIL) |
deaf386e | 3553 | return false; |
933e312e | 3554 | if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM)) |
deaf386e | 3555 | return false; |
71baba4b MG |
3556 | if (fail_page_alloc.ignore_gfp_reclaim && |
3557 | (gfp_mask & __GFP_DIRECT_RECLAIM)) | |
deaf386e | 3558 | return false; |
933e312e AM |
3559 | |
3560 | return should_fail(&fail_page_alloc.attr, 1 << order); | |
3561 | } | |
3562 | ||
3563 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
3564 | ||
3565 | static int __init fail_page_alloc_debugfs(void) | |
3566 | { | |
0825a6f9 | 3567 | umode_t mode = S_IFREG | 0600; |
933e312e | 3568 | struct dentry *dir; |
933e312e | 3569 | |
dd48c085 AM |
3570 | dir = fault_create_debugfs_attr("fail_page_alloc", NULL, |
3571 | &fail_page_alloc.attr); | |
b2588c4b | 3572 | |
d9f7979c GKH |
3573 | debugfs_create_bool("ignore-gfp-wait", mode, dir, |
3574 | &fail_page_alloc.ignore_gfp_reclaim); | |
3575 | debugfs_create_bool("ignore-gfp-highmem", mode, dir, | |
3576 | &fail_page_alloc.ignore_gfp_highmem); | |
3577 | debugfs_create_u32("min-order", mode, dir, &fail_page_alloc.min_order); | |
933e312e | 3578 | |
d9f7979c | 3579 | return 0; |
933e312e AM |
3580 | } |
3581 | ||
3582 | late_initcall(fail_page_alloc_debugfs); | |
3583 | ||
3584 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
3585 | ||
3586 | #else /* CONFIG_FAIL_PAGE_ALLOC */ | |
3587 | ||
af3b8544 | 3588 | static inline bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
933e312e | 3589 | { |
deaf386e | 3590 | return false; |
933e312e AM |
3591 | } |
3592 | ||
3593 | #endif /* CONFIG_FAIL_PAGE_ALLOC */ | |
3594 | ||
76cd6173 | 3595 | noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
af3b8544 BP |
3596 | { |
3597 | return __should_fail_alloc_page(gfp_mask, order); | |
3598 | } | |
3599 | ALLOW_ERROR_INJECTION(should_fail_alloc_page, TRUE); | |
3600 | ||
f27ce0e1 JK |
3601 | static inline long __zone_watermark_unusable_free(struct zone *z, |
3602 | unsigned int order, unsigned int alloc_flags) | |
3603 | { | |
3604 | const bool alloc_harder = (alloc_flags & (ALLOC_HARDER|ALLOC_OOM)); | |
3605 | long unusable_free = (1 << order) - 1; | |
3606 | ||
3607 | /* | |
3608 | * If the caller does not have rights to ALLOC_HARDER then subtract | |
3609 | * the high-atomic reserves. This will over-estimate the size of the | |
3610 | * atomic reserve but it avoids a search. | |
3611 | */ | |
3612 | if (likely(!alloc_harder)) | |
3613 | unusable_free += z->nr_reserved_highatomic; | |
3614 | ||
3615 | #ifdef CONFIG_CMA | |
3616 | /* If allocation can't use CMA areas don't use free CMA pages */ | |
3617 | if (!(alloc_flags & ALLOC_CMA)) | |
3618 | unusable_free += zone_page_state(z, NR_FREE_CMA_PAGES); | |
3619 | #endif | |
3620 | ||
3621 | return unusable_free; | |
3622 | } | |
3623 | ||
1da177e4 | 3624 | /* |
97a16fc8 MG |
3625 | * Return true if free base pages are above 'mark'. For high-order checks it |
3626 | * will return true of the order-0 watermark is reached and there is at least | |
3627 | * one free page of a suitable size. Checking now avoids taking the zone lock | |
3628 | * to check in the allocation paths if no pages are free. | |
1da177e4 | 3629 | */ |
86a294a8 | 3630 | bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
97a225e6 | 3631 | int highest_zoneidx, unsigned int alloc_flags, |
86a294a8 | 3632 | long free_pages) |
1da177e4 | 3633 | { |
d23ad423 | 3634 | long min = mark; |
1da177e4 | 3635 | int o; |
cd04ae1e | 3636 | const bool alloc_harder = (alloc_flags & (ALLOC_HARDER|ALLOC_OOM)); |
1da177e4 | 3637 | |
0aaa29a5 | 3638 | /* free_pages may go negative - that's OK */ |
f27ce0e1 | 3639 | free_pages -= __zone_watermark_unusable_free(z, order, alloc_flags); |
0aaa29a5 | 3640 | |
7fb1d9fc | 3641 | if (alloc_flags & ALLOC_HIGH) |
1da177e4 | 3642 | min -= min / 2; |
0aaa29a5 | 3643 | |
f27ce0e1 | 3644 | if (unlikely(alloc_harder)) { |
cd04ae1e MH |
3645 | /* |
3646 | * OOM victims can try even harder than normal ALLOC_HARDER | |
3647 | * users on the grounds that it's definitely going to be in | |
3648 | * the exit path shortly and free memory. Any allocation it | |
3649 | * makes during the free path will be small and short-lived. | |
3650 | */ | |
3651 | if (alloc_flags & ALLOC_OOM) | |
3652 | min -= min / 2; | |
3653 | else | |
3654 | min -= min / 4; | |
3655 | } | |
3656 | ||
97a16fc8 MG |
3657 | /* |
3658 | * Check watermarks for an order-0 allocation request. If these | |
3659 | * are not met, then a high-order request also cannot go ahead | |
3660 | * even if a suitable page happened to be free. | |
3661 | */ | |
97a225e6 | 3662 | if (free_pages <= min + z->lowmem_reserve[highest_zoneidx]) |
88f5acf8 | 3663 | return false; |
1da177e4 | 3664 | |
97a16fc8 MG |
3665 | /* If this is an order-0 request then the watermark is fine */ |
3666 | if (!order) | |
3667 | return true; | |
3668 | ||
3669 | /* For a high-order request, check at least one suitable page is free */ | |
3670 | for (o = order; o < MAX_ORDER; o++) { | |
3671 | struct free_area *area = &z->free_area[o]; | |
3672 | int mt; | |
3673 | ||
3674 | if (!area->nr_free) | |
3675 | continue; | |
3676 | ||
97a16fc8 | 3677 | for (mt = 0; mt < MIGRATE_PCPTYPES; mt++) { |
b03641af | 3678 | if (!free_area_empty(area, mt)) |
97a16fc8 MG |
3679 | return true; |
3680 | } | |
3681 | ||
3682 | #ifdef CONFIG_CMA | |
d883c6cf | 3683 | if ((alloc_flags & ALLOC_CMA) && |
b03641af | 3684 | !free_area_empty(area, MIGRATE_CMA)) { |
97a16fc8 | 3685 | return true; |
d883c6cf | 3686 | } |
97a16fc8 | 3687 | #endif |
76089d00 | 3688 | if (alloc_harder && !free_area_empty(area, MIGRATE_HIGHATOMIC)) |
b050e376 | 3689 | return true; |
1da177e4 | 3690 | } |
97a16fc8 | 3691 | return false; |
88f5acf8 MG |
3692 | } |
3693 | ||
7aeb09f9 | 3694 | bool zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
97a225e6 | 3695 | int highest_zoneidx, unsigned int alloc_flags) |
88f5acf8 | 3696 | { |
97a225e6 | 3697 | return __zone_watermark_ok(z, order, mark, highest_zoneidx, alloc_flags, |
88f5acf8 MG |
3698 | zone_page_state(z, NR_FREE_PAGES)); |
3699 | } | |
3700 | ||
48ee5f36 | 3701 | static inline bool zone_watermark_fast(struct zone *z, unsigned int order, |
97a225e6 | 3702 | unsigned long mark, int highest_zoneidx, |
f80b08fc | 3703 | unsigned int alloc_flags, gfp_t gfp_mask) |
48ee5f36 | 3704 | { |
f27ce0e1 | 3705 | long free_pages; |
d883c6cf | 3706 | |
f27ce0e1 | 3707 | free_pages = zone_page_state(z, NR_FREE_PAGES); |
48ee5f36 MG |
3708 | |
3709 | /* | |
3710 | * Fast check for order-0 only. If this fails then the reserves | |
f27ce0e1 | 3711 | * need to be calculated. |
48ee5f36 | 3712 | */ |
f27ce0e1 JK |
3713 | if (!order) { |
3714 | long fast_free; | |
3715 | ||
3716 | fast_free = free_pages; | |
3717 | fast_free -= __zone_watermark_unusable_free(z, 0, alloc_flags); | |
3718 | if (fast_free > mark + z->lowmem_reserve[highest_zoneidx]) | |
3719 | return true; | |
3720 | } | |
48ee5f36 | 3721 | |
f80b08fc CTR |
3722 | if (__zone_watermark_ok(z, order, mark, highest_zoneidx, alloc_flags, |
3723 | free_pages)) | |
3724 | return true; | |
3725 | /* | |
3726 | * Ignore watermark boosting for GFP_ATOMIC order-0 allocations | |
3727 | * when checking the min watermark. The min watermark is the | |
3728 | * point where boosting is ignored so that kswapd is woken up | |
3729 | * when below the low watermark. | |
3730 | */ | |
3731 | if (unlikely(!order && (gfp_mask & __GFP_ATOMIC) && z->watermark_boost | |
3732 | && ((alloc_flags & ALLOC_WMARK_MASK) == WMARK_MIN))) { | |
3733 | mark = z->_watermark[WMARK_MIN]; | |
3734 | return __zone_watermark_ok(z, order, mark, highest_zoneidx, | |
3735 | alloc_flags, free_pages); | |
3736 | } | |
3737 | ||
3738 | return false; | |
48ee5f36 MG |
3739 | } |
3740 | ||
7aeb09f9 | 3741 | bool zone_watermark_ok_safe(struct zone *z, unsigned int order, |
97a225e6 | 3742 | unsigned long mark, int highest_zoneidx) |
88f5acf8 MG |
3743 | { |
3744 | long free_pages = zone_page_state(z, NR_FREE_PAGES); | |
3745 | ||
3746 | if (z->percpu_drift_mark && free_pages < z->percpu_drift_mark) | |
3747 | free_pages = zone_page_state_snapshot(z, NR_FREE_PAGES); | |
3748 | ||
97a225e6 | 3749 | return __zone_watermark_ok(z, order, mark, highest_zoneidx, 0, |
88f5acf8 | 3750 | free_pages); |
1da177e4 LT |
3751 | } |
3752 | ||
9276b1bc | 3753 | #ifdef CONFIG_NUMA |
957f822a DR |
3754 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
3755 | { | |
e02dc017 | 3756 | return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) <= |
a55c7454 | 3757 | node_reclaim_distance; |
957f822a | 3758 | } |
9276b1bc | 3759 | #else /* CONFIG_NUMA */ |
957f822a DR |
3760 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
3761 | { | |
3762 | return true; | |
3763 | } | |
9276b1bc PJ |
3764 | #endif /* CONFIG_NUMA */ |
3765 | ||
6bb15450 MG |
3766 | /* |
3767 | * The restriction on ZONE_DMA32 as being a suitable zone to use to avoid | |
3768 | * fragmentation is subtle. If the preferred zone was HIGHMEM then | |
3769 | * premature use of a lower zone may cause lowmem pressure problems that | |
3770 | * are worse than fragmentation. If the next zone is ZONE_DMA then it is | |
3771 | * probably too small. It only makes sense to spread allocations to avoid | |
3772 | * fragmentation between the Normal and DMA32 zones. | |
3773 | */ | |
3774 | static inline unsigned int | |
0a79cdad | 3775 | alloc_flags_nofragment(struct zone *zone, gfp_t gfp_mask) |
6bb15450 | 3776 | { |
736838e9 | 3777 | unsigned int alloc_flags; |
0a79cdad | 3778 | |
736838e9 MN |
3779 | /* |
3780 | * __GFP_KSWAPD_RECLAIM is assumed to be the same as ALLOC_KSWAPD | |
3781 | * to save a branch. | |
3782 | */ | |
3783 | alloc_flags = (__force int) (gfp_mask & __GFP_KSWAPD_RECLAIM); | |
0a79cdad MG |
3784 | |
3785 | #ifdef CONFIG_ZONE_DMA32 | |
8139ad04 AR |
3786 | if (!zone) |
3787 | return alloc_flags; | |
3788 | ||
6bb15450 | 3789 | if (zone_idx(zone) != ZONE_NORMAL) |
8118b82e | 3790 | return alloc_flags; |
6bb15450 MG |
3791 | |
3792 | /* | |
3793 | * If ZONE_DMA32 exists, assume it is the one after ZONE_NORMAL and | |
3794 | * the pointer is within zone->zone_pgdat->node_zones[]. Also assume | |
3795 | * on UMA that if Normal is populated then so is DMA32. | |
3796 | */ | |
3797 | BUILD_BUG_ON(ZONE_NORMAL - ZONE_DMA32 != 1); | |
3798 | if (nr_online_nodes > 1 && !populated_zone(--zone)) | |
8118b82e | 3799 | return alloc_flags; |
6bb15450 | 3800 | |
8118b82e | 3801 | alloc_flags |= ALLOC_NOFRAGMENT; |
0a79cdad MG |
3802 | #endif /* CONFIG_ZONE_DMA32 */ |
3803 | return alloc_flags; | |
6bb15450 | 3804 | } |
6bb15450 | 3805 | |
8510e69c JK |
3806 | static inline unsigned int current_alloc_flags(gfp_t gfp_mask, |
3807 | unsigned int alloc_flags) | |
3808 | { | |
3809 | #ifdef CONFIG_CMA | |
3810 | unsigned int pflags = current->flags; | |
3811 | ||
3812 | if (!(pflags & PF_MEMALLOC_NOCMA) && | |
3813 | gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE) | |
3814 | alloc_flags |= ALLOC_CMA; | |
3815 | ||
3816 | #endif | |
3817 | return alloc_flags; | |
3818 | } | |
3819 | ||
7fb1d9fc | 3820 | /* |
0798e519 | 3821 | * get_page_from_freelist goes through the zonelist trying to allocate |
7fb1d9fc RS |
3822 | * a page. |
3823 | */ | |
3824 | static struct page * | |
a9263751 VB |
3825 | get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, |
3826 | const struct alloc_context *ac) | |
753ee728 | 3827 | { |
6bb15450 | 3828 | struct zoneref *z; |
5117f45d | 3829 | struct zone *zone; |
3b8c0be4 | 3830 | struct pglist_data *last_pgdat_dirty_limit = NULL; |
6bb15450 | 3831 | bool no_fallback; |
3b8c0be4 | 3832 | |
6bb15450 | 3833 | retry: |
7fb1d9fc | 3834 | /* |
9276b1bc | 3835 | * Scan zonelist, looking for a zone with enough free. |
344736f2 | 3836 | * See also __cpuset_node_allowed() comment in kernel/cpuset.c. |
7fb1d9fc | 3837 | */ |
6bb15450 MG |
3838 | no_fallback = alloc_flags & ALLOC_NOFRAGMENT; |
3839 | z = ac->preferred_zoneref; | |
30d8ec73 MN |
3840 | for_next_zone_zonelist_nodemask(zone, z, ac->highest_zoneidx, |
3841 | ac->nodemask) { | |
be06af00 | 3842 | struct page *page; |
e085dbc5 JW |
3843 | unsigned long mark; |
3844 | ||
664eedde MG |
3845 | if (cpusets_enabled() && |
3846 | (alloc_flags & ALLOC_CPUSET) && | |
002f2906 | 3847 | !__cpuset_zone_allowed(zone, gfp_mask)) |
cd38b115 | 3848 | continue; |
a756cf59 JW |
3849 | /* |
3850 | * When allocating a page cache page for writing, we | |
281e3726 MG |
3851 | * want to get it from a node that is within its dirty |
3852 | * limit, such that no single node holds more than its | |
a756cf59 | 3853 | * proportional share of globally allowed dirty pages. |
281e3726 | 3854 | * The dirty limits take into account the node's |
a756cf59 JW |
3855 | * lowmem reserves and high watermark so that kswapd |
3856 | * should be able to balance it without having to | |
3857 | * write pages from its LRU list. | |
3858 | * | |
a756cf59 | 3859 | * XXX: For now, allow allocations to potentially |
281e3726 | 3860 | * exceed the per-node dirty limit in the slowpath |
c9ab0c4f | 3861 | * (spread_dirty_pages unset) before going into reclaim, |
a756cf59 | 3862 | * which is important when on a NUMA setup the allowed |
281e3726 | 3863 | * nodes are together not big enough to reach the |
a756cf59 | 3864 | * global limit. The proper fix for these situations |
281e3726 | 3865 | * will require awareness of nodes in the |
a756cf59 JW |
3866 | * dirty-throttling and the flusher threads. |
3867 | */ | |
3b8c0be4 MG |
3868 | if (ac->spread_dirty_pages) { |
3869 | if (last_pgdat_dirty_limit == zone->zone_pgdat) | |
3870 | continue; | |
3871 | ||
3872 | if (!node_dirty_ok(zone->zone_pgdat)) { | |
3873 | last_pgdat_dirty_limit = zone->zone_pgdat; | |
3874 | continue; | |
3875 | } | |
3876 | } | |
7fb1d9fc | 3877 | |
6bb15450 MG |
3878 | if (no_fallback && nr_online_nodes > 1 && |
3879 | zone != ac->preferred_zoneref->zone) { | |
3880 | int local_nid; | |
3881 | ||
3882 | /* | |
3883 | * If moving to a remote node, retry but allow | |
3884 | * fragmenting fallbacks. Locality is more important | |
3885 | * than fragmentation avoidance. | |
3886 | */ | |
3887 | local_nid = zone_to_nid(ac->preferred_zoneref->zone); | |
3888 | if (zone_to_nid(zone) != local_nid) { | |
3889 | alloc_flags &= ~ALLOC_NOFRAGMENT; | |
3890 | goto retry; | |
3891 | } | |
3892 | } | |
3893 | ||
a9214443 | 3894 | mark = wmark_pages(zone, alloc_flags & ALLOC_WMARK_MASK); |
48ee5f36 | 3895 | if (!zone_watermark_fast(zone, order, mark, |
f80b08fc CTR |
3896 | ac->highest_zoneidx, alloc_flags, |
3897 | gfp_mask)) { | |
fa5e084e MG |
3898 | int ret; |
3899 | ||
c9e97a19 PT |
3900 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
3901 | /* | |
3902 | * Watermark failed for this zone, but see if we can | |
3903 | * grow this zone if it contains deferred pages. | |
3904 | */ | |
3905 | if (static_branch_unlikely(&deferred_pages)) { | |
3906 | if (_deferred_grow_zone(zone, order)) | |
3907 | goto try_this_zone; | |
3908 | } | |
3909 | #endif | |
5dab2911 MG |
3910 | /* Checked here to keep the fast path fast */ |
3911 | BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK); | |
3912 | if (alloc_flags & ALLOC_NO_WATERMARKS) | |
3913 | goto try_this_zone; | |
3914 | ||
a5f5f91d | 3915 | if (node_reclaim_mode == 0 || |
c33d6c06 | 3916 | !zone_allows_reclaim(ac->preferred_zoneref->zone, zone)) |
cd38b115 MG |
3917 | continue; |
3918 | ||
a5f5f91d | 3919 | ret = node_reclaim(zone->zone_pgdat, gfp_mask, order); |
fa5e084e | 3920 | switch (ret) { |
a5f5f91d | 3921 | case NODE_RECLAIM_NOSCAN: |
fa5e084e | 3922 | /* did not scan */ |
cd38b115 | 3923 | continue; |
a5f5f91d | 3924 | case NODE_RECLAIM_FULL: |
fa5e084e | 3925 | /* scanned but unreclaimable */ |
cd38b115 | 3926 | continue; |
fa5e084e MG |
3927 | default: |
3928 | /* did we reclaim enough */ | |
fed2719e | 3929 | if (zone_watermark_ok(zone, order, mark, |
97a225e6 | 3930 | ac->highest_zoneidx, alloc_flags)) |
fed2719e MG |
3931 | goto try_this_zone; |
3932 | ||
fed2719e | 3933 | continue; |
0798e519 | 3934 | } |
7fb1d9fc RS |
3935 | } |
3936 | ||
fa5e084e | 3937 | try_this_zone: |
066b2393 | 3938 | page = rmqueue(ac->preferred_zoneref->zone, zone, order, |
0aaa29a5 | 3939 | gfp_mask, alloc_flags, ac->migratetype); |
75379191 | 3940 | if (page) { |
479f854a | 3941 | prep_new_page(page, order, gfp_mask, alloc_flags); |
0aaa29a5 MG |
3942 | |
3943 | /* | |
3944 | * If this is a high-order atomic allocation then check | |
3945 | * if the pageblock should be reserved for the future | |
3946 | */ | |
3947 | if (unlikely(order && (alloc_flags & ALLOC_HARDER))) | |
3948 | reserve_highatomic_pageblock(page, zone, order); | |
3949 | ||
75379191 | 3950 | return page; |
c9e97a19 PT |
3951 | } else { |
3952 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT | |
3953 | /* Try again if zone has deferred pages */ | |
3954 | if (static_branch_unlikely(&deferred_pages)) { | |
3955 | if (_deferred_grow_zone(zone, order)) | |
3956 | goto try_this_zone; | |
3957 | } | |
3958 | #endif | |
75379191 | 3959 | } |
54a6eb5c | 3960 | } |
9276b1bc | 3961 | |
6bb15450 MG |
3962 | /* |
3963 | * It's possible on a UMA machine to get through all zones that are | |
3964 | * fragmented. If avoiding fragmentation, reset and try again. | |
3965 | */ | |
3966 | if (no_fallback) { | |
3967 | alloc_flags &= ~ALLOC_NOFRAGMENT; | |
3968 | goto retry; | |
3969 | } | |
3970 | ||
4ffeaf35 | 3971 | return NULL; |
753ee728 MH |
3972 | } |
3973 | ||
9af744d7 | 3974 | static void warn_alloc_show_mem(gfp_t gfp_mask, nodemask_t *nodemask) |
a238ab5b | 3975 | { |
a238ab5b | 3976 | unsigned int filter = SHOW_MEM_FILTER_NODES; |
a238ab5b DH |
3977 | |
3978 | /* | |
3979 | * This documents exceptions given to allocations in certain | |
3980 | * contexts that are allowed to allocate outside current's set | |
3981 | * of allowed nodes. | |
3982 | */ | |
3983 | if (!(gfp_mask & __GFP_NOMEMALLOC)) | |
cd04ae1e | 3984 | if (tsk_is_oom_victim(current) || |
a238ab5b DH |
3985 | (current->flags & (PF_MEMALLOC | PF_EXITING))) |
3986 | filter &= ~SHOW_MEM_FILTER_NODES; | |
d0164adc | 3987 | if (in_interrupt() || !(gfp_mask & __GFP_DIRECT_RECLAIM)) |
a238ab5b DH |
3988 | filter &= ~SHOW_MEM_FILTER_NODES; |
3989 | ||
9af744d7 | 3990 | show_mem(filter, nodemask); |
aa187507 MH |
3991 | } |
3992 | ||
a8e99259 | 3993 | void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...) |
aa187507 MH |
3994 | { |
3995 | struct va_format vaf; | |
3996 | va_list args; | |
1be334e5 | 3997 | static DEFINE_RATELIMIT_STATE(nopage_rs, 10*HZ, 1); |
aa187507 | 3998 | |
0f7896f1 | 3999 | if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs)) |
aa187507 MH |
4000 | return; |
4001 | ||
7877cdcc MH |
4002 | va_start(args, fmt); |
4003 | vaf.fmt = fmt; | |
4004 | vaf.va = &args; | |
ef8444ea | 4005 | pr_warn("%s: %pV, mode:%#x(%pGg), nodemask=%*pbl", |
0205f755 MH |
4006 | current->comm, &vaf, gfp_mask, &gfp_mask, |
4007 | nodemask_pr_args(nodemask)); | |
7877cdcc | 4008 | va_end(args); |
3ee9a4f0 | 4009 | |
a8e99259 | 4010 | cpuset_print_current_mems_allowed(); |
ef8444ea | 4011 | pr_cont("\n"); |
a238ab5b | 4012 | dump_stack(); |
685dbf6f | 4013 | warn_alloc_show_mem(gfp_mask, nodemask); |
a238ab5b DH |
4014 | } |
4015 | ||
6c18ba7a MH |
4016 | static inline struct page * |
4017 | __alloc_pages_cpuset_fallback(gfp_t gfp_mask, unsigned int order, | |
4018 | unsigned int alloc_flags, | |
4019 | const struct alloc_context *ac) | |
4020 | { | |
4021 | struct page *page; | |
4022 | ||
4023 | page = get_page_from_freelist(gfp_mask, order, | |
4024 | alloc_flags|ALLOC_CPUSET, ac); | |
4025 | /* | |
4026 | * fallback to ignore cpuset restriction if our nodes | |
4027 | * are depleted | |
4028 | */ | |
4029 | if (!page) | |
4030 | page = get_page_from_freelist(gfp_mask, order, | |
4031 | alloc_flags, ac); | |
4032 | ||
4033 | return page; | |
4034 | } | |
4035 | ||
11e33f6a MG |
4036 | static inline struct page * |
4037 | __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 4038 | const struct alloc_context *ac, unsigned long *did_some_progress) |
11e33f6a | 4039 | { |
6e0fc46d DR |
4040 | struct oom_control oc = { |
4041 | .zonelist = ac->zonelist, | |
4042 | .nodemask = ac->nodemask, | |
2a966b77 | 4043 | .memcg = NULL, |
6e0fc46d DR |
4044 | .gfp_mask = gfp_mask, |
4045 | .order = order, | |
6e0fc46d | 4046 | }; |
11e33f6a MG |
4047 | struct page *page; |
4048 | ||
9879de73 JW |
4049 | *did_some_progress = 0; |
4050 | ||
9879de73 | 4051 | /* |
dc56401f JW |
4052 | * Acquire the oom lock. If that fails, somebody else is |
4053 | * making progress for us. | |
9879de73 | 4054 | */ |
dc56401f | 4055 | if (!mutex_trylock(&oom_lock)) { |
9879de73 | 4056 | *did_some_progress = 1; |
11e33f6a | 4057 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
4058 | return NULL; |
4059 | } | |
6b1de916 | 4060 | |
11e33f6a MG |
4061 | /* |
4062 | * Go through the zonelist yet one more time, keep very high watermark | |
4063 | * here, this is only to catch a parallel oom killing, we must fail if | |
e746bf73 TH |
4064 | * we're still under heavy pressure. But make sure that this reclaim |
4065 | * attempt shall not depend on __GFP_DIRECT_RECLAIM && !__GFP_NORETRY | |
4066 | * allocation which will never fail due to oom_lock already held. | |
11e33f6a | 4067 | */ |
e746bf73 TH |
4068 | page = get_page_from_freelist((gfp_mask | __GFP_HARDWALL) & |
4069 | ~__GFP_DIRECT_RECLAIM, order, | |
4070 | ALLOC_WMARK_HIGH|ALLOC_CPUSET, ac); | |
7fb1d9fc | 4071 | if (page) |
11e33f6a MG |
4072 | goto out; |
4073 | ||
06ad276a MH |
4074 | /* Coredumps can quickly deplete all memory reserves */ |
4075 | if (current->flags & PF_DUMPCORE) | |
4076 | goto out; | |
4077 | /* The OOM killer will not help higher order allocs */ | |
4078 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
4079 | goto out; | |
dcda9b04 MH |
4080 | /* |
4081 | * We have already exhausted all our reclaim opportunities without any | |
4082 | * success so it is time to admit defeat. We will skip the OOM killer | |
4083 | * because it is very likely that the caller has a more reasonable | |
4084 | * fallback than shooting a random task. | |
cfb4a541 MN |
4085 | * |
4086 | * The OOM killer may not free memory on a specific node. | |
dcda9b04 | 4087 | */ |
cfb4a541 | 4088 | if (gfp_mask & (__GFP_RETRY_MAYFAIL | __GFP_THISNODE)) |
dcda9b04 | 4089 | goto out; |
06ad276a | 4090 | /* The OOM killer does not needlessly kill tasks for lowmem */ |
97a225e6 | 4091 | if (ac->highest_zoneidx < ZONE_NORMAL) |
06ad276a MH |
4092 | goto out; |
4093 | if (pm_suspended_storage()) | |
4094 | goto out; | |
4095 | /* | |
4096 | * XXX: GFP_NOFS allocations should rather fail than rely on | |
4097 | * other request to make a forward progress. | |
4098 | * We are in an unfortunate situation where out_of_memory cannot | |
4099 | * do much for this context but let's try it to at least get | |
4100 | * access to memory reserved if the current task is killed (see | |
4101 | * out_of_memory). Once filesystems are ready to handle allocation | |
4102 | * failures more gracefully we should just bail out here. | |
4103 | */ | |
4104 | ||
3c2c6488 | 4105 | /* Exhausted what can be done so it's blame time */ |
5020e285 | 4106 | if (out_of_memory(&oc) || WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL)) { |
c32b3cbe | 4107 | *did_some_progress = 1; |
5020e285 | 4108 | |
6c18ba7a MH |
4109 | /* |
4110 | * Help non-failing allocations by giving them access to memory | |
4111 | * reserves | |
4112 | */ | |
4113 | if (gfp_mask & __GFP_NOFAIL) | |
4114 | page = __alloc_pages_cpuset_fallback(gfp_mask, order, | |
5020e285 | 4115 | ALLOC_NO_WATERMARKS, ac); |
5020e285 | 4116 | } |
11e33f6a | 4117 | out: |
dc56401f | 4118 | mutex_unlock(&oom_lock); |
11e33f6a MG |
4119 | return page; |
4120 | } | |
4121 | ||
33c2d214 MH |
4122 | /* |
4123 | * Maximum number of compaction retries wit a progress before OOM | |
4124 | * killer is consider as the only way to move forward. | |
4125 | */ | |
4126 | #define MAX_COMPACT_RETRIES 16 | |
4127 | ||
56de7263 MG |
4128 | #ifdef CONFIG_COMPACTION |
4129 | /* Try memory compaction for high-order allocations before reclaim */ | |
4130 | static struct page * | |
4131 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
c603844b | 4132 | unsigned int alloc_flags, const struct alloc_context *ac, |
a5508cd8 | 4133 | enum compact_priority prio, enum compact_result *compact_result) |
56de7263 | 4134 | { |
5e1f0f09 | 4135 | struct page *page = NULL; |
eb414681 | 4136 | unsigned long pflags; |
499118e9 | 4137 | unsigned int noreclaim_flag; |
53853e2d VB |
4138 | |
4139 | if (!order) | |
66199712 | 4140 | return NULL; |
66199712 | 4141 | |
eb414681 | 4142 | psi_memstall_enter(&pflags); |
499118e9 | 4143 | noreclaim_flag = memalloc_noreclaim_save(); |
eb414681 | 4144 | |
c5d01d0d | 4145 | *compact_result = try_to_compact_pages(gfp_mask, order, alloc_flags, ac, |
5e1f0f09 | 4146 | prio, &page); |
eb414681 | 4147 | |
499118e9 | 4148 | memalloc_noreclaim_restore(noreclaim_flag); |
eb414681 | 4149 | psi_memstall_leave(&pflags); |
56de7263 | 4150 | |
98dd3b48 VB |
4151 | /* |
4152 | * At least in one zone compaction wasn't deferred or skipped, so let's | |
4153 | * count a compaction stall | |
4154 | */ | |
4155 | count_vm_event(COMPACTSTALL); | |
8fb74b9f | 4156 | |
5e1f0f09 MG |
4157 | /* Prep a captured page if available */ |
4158 | if (page) | |
4159 | prep_new_page(page, order, gfp_mask, alloc_flags); | |
4160 | ||
4161 | /* Try get a page from the freelist if available */ | |
4162 | if (!page) | |
4163 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); | |
53853e2d | 4164 | |
98dd3b48 VB |
4165 | if (page) { |
4166 | struct zone *zone = page_zone(page); | |
53853e2d | 4167 | |
98dd3b48 VB |
4168 | zone->compact_blockskip_flush = false; |
4169 | compaction_defer_reset(zone, order, true); | |
4170 | count_vm_event(COMPACTSUCCESS); | |
4171 | return page; | |
4172 | } | |
56de7263 | 4173 | |
98dd3b48 VB |
4174 | /* |
4175 | * It's bad if compaction run occurs and fails. The most likely reason | |
4176 | * is that pages exist, but not enough to satisfy watermarks. | |
4177 | */ | |
4178 | count_vm_event(COMPACTFAIL); | |
66199712 | 4179 | |
98dd3b48 | 4180 | cond_resched(); |
56de7263 MG |
4181 | |
4182 | return NULL; | |
4183 | } | |
33c2d214 | 4184 | |
3250845d VB |
4185 | static inline bool |
4186 | should_compact_retry(struct alloc_context *ac, int order, int alloc_flags, | |
4187 | enum compact_result compact_result, | |
4188 | enum compact_priority *compact_priority, | |
d9436498 | 4189 | int *compaction_retries) |
3250845d VB |
4190 | { |
4191 | int max_retries = MAX_COMPACT_RETRIES; | |
c2033b00 | 4192 | int min_priority; |
65190cff MH |
4193 | bool ret = false; |
4194 | int retries = *compaction_retries; | |
4195 | enum compact_priority priority = *compact_priority; | |
3250845d VB |
4196 | |
4197 | if (!order) | |
4198 | return false; | |
4199 | ||
d9436498 VB |
4200 | if (compaction_made_progress(compact_result)) |
4201 | (*compaction_retries)++; | |
4202 | ||
3250845d VB |
4203 | /* |
4204 | * compaction considers all the zone as desperately out of memory | |
4205 | * so it doesn't really make much sense to retry except when the | |
4206 | * failure could be caused by insufficient priority | |
4207 | */ | |
d9436498 VB |
4208 | if (compaction_failed(compact_result)) |
4209 | goto check_priority; | |
3250845d | 4210 | |
49433085 VB |
4211 | /* |
4212 | * compaction was skipped because there are not enough order-0 pages | |
4213 | * to work with, so we retry only if it looks like reclaim can help. | |
4214 | */ | |
4215 | if (compaction_needs_reclaim(compact_result)) { | |
4216 | ret = compaction_zonelist_suitable(ac, order, alloc_flags); | |
4217 | goto out; | |
4218 | } | |
4219 | ||
3250845d VB |
4220 | /* |
4221 | * make sure the compaction wasn't deferred or didn't bail out early | |
4222 | * due to locks contention before we declare that we should give up. | |
49433085 VB |
4223 | * But the next retry should use a higher priority if allowed, so |
4224 | * we don't just keep bailing out endlessly. | |
3250845d | 4225 | */ |
65190cff | 4226 | if (compaction_withdrawn(compact_result)) { |
49433085 | 4227 | goto check_priority; |
65190cff | 4228 | } |
3250845d VB |
4229 | |
4230 | /* | |
dcda9b04 | 4231 | * !costly requests are much more important than __GFP_RETRY_MAYFAIL |
3250845d VB |
4232 | * costly ones because they are de facto nofail and invoke OOM |
4233 | * killer to move on while costly can fail and users are ready | |
4234 | * to cope with that. 1/4 retries is rather arbitrary but we | |
4235 | * would need much more detailed feedback from compaction to | |
4236 | * make a better decision. | |
4237 | */ | |
4238 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
4239 | max_retries /= 4; | |
65190cff MH |
4240 | if (*compaction_retries <= max_retries) { |
4241 | ret = true; | |
4242 | goto out; | |
4243 | } | |
3250845d | 4244 | |
d9436498 VB |
4245 | /* |
4246 | * Make sure there are attempts at the highest priority if we exhausted | |
4247 | * all retries or failed at the lower priorities. | |
4248 | */ | |
4249 | check_priority: | |
c2033b00 VB |
4250 | min_priority = (order > PAGE_ALLOC_COSTLY_ORDER) ? |
4251 | MIN_COMPACT_COSTLY_PRIORITY : MIN_COMPACT_PRIORITY; | |
65190cff | 4252 | |
c2033b00 | 4253 | if (*compact_priority > min_priority) { |
d9436498 VB |
4254 | (*compact_priority)--; |
4255 | *compaction_retries = 0; | |
65190cff | 4256 | ret = true; |
d9436498 | 4257 | } |
65190cff MH |
4258 | out: |
4259 | trace_compact_retry(order, priority, compact_result, retries, max_retries, ret); | |
4260 | return ret; | |
3250845d | 4261 | } |
56de7263 MG |
4262 | #else |
4263 | static inline struct page * | |
4264 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
c603844b | 4265 | unsigned int alloc_flags, const struct alloc_context *ac, |
a5508cd8 | 4266 | enum compact_priority prio, enum compact_result *compact_result) |
56de7263 | 4267 | { |
33c2d214 | 4268 | *compact_result = COMPACT_SKIPPED; |
56de7263 MG |
4269 | return NULL; |
4270 | } | |
33c2d214 MH |
4271 | |
4272 | static inline bool | |
86a294a8 MH |
4273 | should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_flags, |
4274 | enum compact_result compact_result, | |
a5508cd8 | 4275 | enum compact_priority *compact_priority, |
d9436498 | 4276 | int *compaction_retries) |
33c2d214 | 4277 | { |
31e49bfd MH |
4278 | struct zone *zone; |
4279 | struct zoneref *z; | |
4280 | ||
4281 | if (!order || order > PAGE_ALLOC_COSTLY_ORDER) | |
4282 | return false; | |
4283 | ||
4284 | /* | |
4285 | * There are setups with compaction disabled which would prefer to loop | |
4286 | * inside the allocator rather than hit the oom killer prematurely. | |
4287 | * Let's give them a good hope and keep retrying while the order-0 | |
4288 | * watermarks are OK. | |
4289 | */ | |
97a225e6 JK |
4290 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, |
4291 | ac->highest_zoneidx, ac->nodemask) { | |
31e49bfd | 4292 | if (zone_watermark_ok(zone, 0, min_wmark_pages(zone), |
97a225e6 | 4293 | ac->highest_zoneidx, alloc_flags)) |
31e49bfd MH |
4294 | return true; |
4295 | } | |
33c2d214 MH |
4296 | return false; |
4297 | } | |
3250845d | 4298 | #endif /* CONFIG_COMPACTION */ |
56de7263 | 4299 | |
d92a8cfc | 4300 | #ifdef CONFIG_LOCKDEP |
93781325 | 4301 | static struct lockdep_map __fs_reclaim_map = |
d92a8cfc PZ |
4302 | STATIC_LOCKDEP_MAP_INIT("fs_reclaim", &__fs_reclaim_map); |
4303 | ||
f920e413 | 4304 | static bool __need_reclaim(gfp_t gfp_mask) |
d92a8cfc | 4305 | { |
d92a8cfc PZ |
4306 | /* no reclaim without waiting on it */ |
4307 | if (!(gfp_mask & __GFP_DIRECT_RECLAIM)) | |
4308 | return false; | |
4309 | ||
4310 | /* this guy won't enter reclaim */ | |
2e517d68 | 4311 | if (current->flags & PF_MEMALLOC) |
d92a8cfc PZ |
4312 | return false; |
4313 | ||
d92a8cfc PZ |
4314 | if (gfp_mask & __GFP_NOLOCKDEP) |
4315 | return false; | |
4316 | ||
4317 | return true; | |
4318 | } | |
4319 | ||
93781325 OS |
4320 | void __fs_reclaim_acquire(void) |
4321 | { | |
4322 | lock_map_acquire(&__fs_reclaim_map); | |
4323 | } | |
4324 | ||
4325 | void __fs_reclaim_release(void) | |
4326 | { | |
4327 | lock_map_release(&__fs_reclaim_map); | |
4328 | } | |
4329 | ||
d92a8cfc PZ |
4330 | void fs_reclaim_acquire(gfp_t gfp_mask) |
4331 | { | |
f920e413 DV |
4332 | gfp_mask = current_gfp_context(gfp_mask); |
4333 | ||
4334 | if (__need_reclaim(gfp_mask)) { | |
4335 | if (gfp_mask & __GFP_FS) | |
4336 | __fs_reclaim_acquire(); | |
4337 | ||
4338 | #ifdef CONFIG_MMU_NOTIFIER | |
4339 | lock_map_acquire(&__mmu_notifier_invalidate_range_start_map); | |
4340 | lock_map_release(&__mmu_notifier_invalidate_range_start_map); | |
4341 | #endif | |
4342 | ||
4343 | } | |
d92a8cfc PZ |
4344 | } |
4345 | EXPORT_SYMBOL_GPL(fs_reclaim_acquire); | |
4346 | ||
4347 | void fs_reclaim_release(gfp_t gfp_mask) | |
4348 | { | |
f920e413 DV |
4349 | gfp_mask = current_gfp_context(gfp_mask); |
4350 | ||
4351 | if (__need_reclaim(gfp_mask)) { | |
4352 | if (gfp_mask & __GFP_FS) | |
4353 | __fs_reclaim_release(); | |
4354 | } | |
d92a8cfc PZ |
4355 | } |
4356 | EXPORT_SYMBOL_GPL(fs_reclaim_release); | |
4357 | #endif | |
4358 | ||
bba90710 | 4359 | /* Perform direct synchronous page reclaim */ |
2187e17b | 4360 | static unsigned long |
a9263751 VB |
4361 | __perform_reclaim(gfp_t gfp_mask, unsigned int order, |
4362 | const struct alloc_context *ac) | |
11e33f6a | 4363 | { |
499118e9 | 4364 | unsigned int noreclaim_flag; |
2187e17b | 4365 | unsigned long pflags, progress; |
11e33f6a MG |
4366 | |
4367 | cond_resched(); | |
4368 | ||
4369 | /* We now go into synchronous reclaim */ | |
4370 | cpuset_memory_pressure_bump(); | |
eb414681 | 4371 | psi_memstall_enter(&pflags); |
d92a8cfc | 4372 | fs_reclaim_acquire(gfp_mask); |
93781325 | 4373 | noreclaim_flag = memalloc_noreclaim_save(); |
11e33f6a | 4374 | |
a9263751 VB |
4375 | progress = try_to_free_pages(ac->zonelist, order, gfp_mask, |
4376 | ac->nodemask); | |
11e33f6a | 4377 | |
499118e9 | 4378 | memalloc_noreclaim_restore(noreclaim_flag); |
93781325 | 4379 | fs_reclaim_release(gfp_mask); |
eb414681 | 4380 | psi_memstall_leave(&pflags); |
11e33f6a MG |
4381 | |
4382 | cond_resched(); | |
4383 | ||
bba90710 MS |
4384 | return progress; |
4385 | } | |
4386 | ||
4387 | /* The really slow allocator path where we enter direct reclaim */ | |
4388 | static inline struct page * | |
4389 | __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, | |
c603844b | 4390 | unsigned int alloc_flags, const struct alloc_context *ac, |
a9263751 | 4391 | unsigned long *did_some_progress) |
bba90710 MS |
4392 | { |
4393 | struct page *page = NULL; | |
4394 | bool drained = false; | |
4395 | ||
a9263751 | 4396 | *did_some_progress = __perform_reclaim(gfp_mask, order, ac); |
9ee493ce MG |
4397 | if (unlikely(!(*did_some_progress))) |
4398 | return NULL; | |
11e33f6a | 4399 | |
9ee493ce | 4400 | retry: |
31a6c190 | 4401 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); |
9ee493ce MG |
4402 | |
4403 | /* | |
4404 | * If an allocation failed after direct reclaim, it could be because | |
0aaa29a5 | 4405 | * pages are pinned on the per-cpu lists or in high alloc reserves. |
047b9967 | 4406 | * Shrink them and try again |
9ee493ce MG |
4407 | */ |
4408 | if (!page && !drained) { | |
29fac03b | 4409 | unreserve_highatomic_pageblock(ac, false); |
93481ff0 | 4410 | drain_all_pages(NULL); |
9ee493ce MG |
4411 | drained = true; |
4412 | goto retry; | |
4413 | } | |
4414 | ||
11e33f6a MG |
4415 | return page; |
4416 | } | |
4417 | ||
5ecd9d40 DR |
4418 | static void wake_all_kswapds(unsigned int order, gfp_t gfp_mask, |
4419 | const struct alloc_context *ac) | |
3a025760 JW |
4420 | { |
4421 | struct zoneref *z; | |
4422 | struct zone *zone; | |
e1a55637 | 4423 | pg_data_t *last_pgdat = NULL; |
97a225e6 | 4424 | enum zone_type highest_zoneidx = ac->highest_zoneidx; |
3a025760 | 4425 | |
97a225e6 | 4426 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, highest_zoneidx, |
5ecd9d40 | 4427 | ac->nodemask) { |
e1a55637 | 4428 | if (last_pgdat != zone->zone_pgdat) |
97a225e6 | 4429 | wakeup_kswapd(zone, gfp_mask, order, highest_zoneidx); |
e1a55637 MG |
4430 | last_pgdat = zone->zone_pgdat; |
4431 | } | |
3a025760 JW |
4432 | } |
4433 | ||
c603844b | 4434 | static inline unsigned int |
341ce06f PZ |
4435 | gfp_to_alloc_flags(gfp_t gfp_mask) |
4436 | { | |
c603844b | 4437 | unsigned int alloc_flags = ALLOC_WMARK_MIN | ALLOC_CPUSET; |
1da177e4 | 4438 | |
736838e9 MN |
4439 | /* |
4440 | * __GFP_HIGH is assumed to be the same as ALLOC_HIGH | |
4441 | * and __GFP_KSWAPD_RECLAIM is assumed to be the same as ALLOC_KSWAPD | |
4442 | * to save two branches. | |
4443 | */ | |
e6223a3b | 4444 | BUILD_BUG_ON(__GFP_HIGH != (__force gfp_t) ALLOC_HIGH); |
736838e9 | 4445 | BUILD_BUG_ON(__GFP_KSWAPD_RECLAIM != (__force gfp_t) ALLOC_KSWAPD); |
933e312e | 4446 | |
341ce06f PZ |
4447 | /* |
4448 | * The caller may dip into page reserves a bit more if the caller | |
4449 | * cannot run direct reclaim, or if the caller has realtime scheduling | |
4450 | * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will | |
d0164adc | 4451 | * set both ALLOC_HARDER (__GFP_ATOMIC) and ALLOC_HIGH (__GFP_HIGH). |
341ce06f | 4452 | */ |
736838e9 MN |
4453 | alloc_flags |= (__force int) |
4454 | (gfp_mask & (__GFP_HIGH | __GFP_KSWAPD_RECLAIM)); | |
1da177e4 | 4455 | |
d0164adc | 4456 | if (gfp_mask & __GFP_ATOMIC) { |
5c3240d9 | 4457 | /* |
b104a35d DR |
4458 | * Not worth trying to allocate harder for __GFP_NOMEMALLOC even |
4459 | * if it can't schedule. | |
5c3240d9 | 4460 | */ |
b104a35d | 4461 | if (!(gfp_mask & __GFP_NOMEMALLOC)) |
5c3240d9 | 4462 | alloc_flags |= ALLOC_HARDER; |
523b9458 | 4463 | /* |
b104a35d | 4464 | * Ignore cpuset mems for GFP_ATOMIC rather than fail, see the |
344736f2 | 4465 | * comment for __cpuset_node_allowed(). |
523b9458 | 4466 | */ |
341ce06f | 4467 | alloc_flags &= ~ALLOC_CPUSET; |
c06b1fca | 4468 | } else if (unlikely(rt_task(current)) && !in_interrupt()) |
341ce06f PZ |
4469 | alloc_flags |= ALLOC_HARDER; |
4470 | ||
8510e69c JK |
4471 | alloc_flags = current_alloc_flags(gfp_mask, alloc_flags); |
4472 | ||
341ce06f PZ |
4473 | return alloc_flags; |
4474 | } | |
4475 | ||
cd04ae1e | 4476 | static bool oom_reserves_allowed(struct task_struct *tsk) |
072bb0aa | 4477 | { |
cd04ae1e MH |
4478 | if (!tsk_is_oom_victim(tsk)) |
4479 | return false; | |
4480 | ||
4481 | /* | |
4482 | * !MMU doesn't have oom reaper so give access to memory reserves | |
4483 | * only to the thread with TIF_MEMDIE set | |
4484 | */ | |
4485 | if (!IS_ENABLED(CONFIG_MMU) && !test_thread_flag(TIF_MEMDIE)) | |
31a6c190 VB |
4486 | return false; |
4487 | ||
cd04ae1e MH |
4488 | return true; |
4489 | } | |
4490 | ||
4491 | /* | |
4492 | * Distinguish requests which really need access to full memory | |
4493 | * reserves from oom victims which can live with a portion of it | |
4494 | */ | |
4495 | static inline int __gfp_pfmemalloc_flags(gfp_t gfp_mask) | |
4496 | { | |
4497 | if (unlikely(gfp_mask & __GFP_NOMEMALLOC)) | |
4498 | return 0; | |
31a6c190 | 4499 | if (gfp_mask & __GFP_MEMALLOC) |
cd04ae1e | 4500 | return ALLOC_NO_WATERMARKS; |
31a6c190 | 4501 | if (in_serving_softirq() && (current->flags & PF_MEMALLOC)) |
cd04ae1e MH |
4502 | return ALLOC_NO_WATERMARKS; |
4503 | if (!in_interrupt()) { | |
4504 | if (current->flags & PF_MEMALLOC) | |
4505 | return ALLOC_NO_WATERMARKS; | |
4506 | else if (oom_reserves_allowed(current)) | |
4507 | return ALLOC_OOM; | |
4508 | } | |
31a6c190 | 4509 | |
cd04ae1e MH |
4510 | return 0; |
4511 | } | |
4512 | ||
4513 | bool gfp_pfmemalloc_allowed(gfp_t gfp_mask) | |
4514 | { | |
4515 | return !!__gfp_pfmemalloc_flags(gfp_mask); | |
072bb0aa MG |
4516 | } |
4517 | ||
0a0337e0 MH |
4518 | /* |
4519 | * Checks whether it makes sense to retry the reclaim to make a forward progress | |
4520 | * for the given allocation request. | |
491d79ae JW |
4521 | * |
4522 | * We give up when we either have tried MAX_RECLAIM_RETRIES in a row | |
4523 | * without success, or when we couldn't even meet the watermark if we | |
4524 | * reclaimed all remaining pages on the LRU lists. | |
0a0337e0 MH |
4525 | * |
4526 | * Returns true if a retry is viable or false to enter the oom path. | |
4527 | */ | |
4528 | static inline bool | |
4529 | should_reclaim_retry(gfp_t gfp_mask, unsigned order, | |
4530 | struct alloc_context *ac, int alloc_flags, | |
423b452e | 4531 | bool did_some_progress, int *no_progress_loops) |
0a0337e0 MH |
4532 | { |
4533 | struct zone *zone; | |
4534 | struct zoneref *z; | |
15f570bf | 4535 | bool ret = false; |
0a0337e0 | 4536 | |
423b452e VB |
4537 | /* |
4538 | * Costly allocations might have made a progress but this doesn't mean | |
4539 | * their order will become available due to high fragmentation so | |
4540 | * always increment the no progress counter for them | |
4541 | */ | |
4542 | if (did_some_progress && order <= PAGE_ALLOC_COSTLY_ORDER) | |
4543 | *no_progress_loops = 0; | |
4544 | else | |
4545 | (*no_progress_loops)++; | |
4546 | ||
0a0337e0 MH |
4547 | /* |
4548 | * Make sure we converge to OOM if we cannot make any progress | |
4549 | * several times in the row. | |
4550 | */ | |
04c8716f MK |
4551 | if (*no_progress_loops > MAX_RECLAIM_RETRIES) { |
4552 | /* Before OOM, exhaust highatomic_reserve */ | |
29fac03b | 4553 | return unreserve_highatomic_pageblock(ac, true); |
04c8716f | 4554 | } |
0a0337e0 | 4555 | |
bca67592 MG |
4556 | /* |
4557 | * Keep reclaiming pages while there is a chance this will lead | |
4558 | * somewhere. If none of the target zones can satisfy our allocation | |
4559 | * request even if all reclaimable pages are considered then we are | |
4560 | * screwed and have to go OOM. | |
0a0337e0 | 4561 | */ |
97a225e6 JK |
4562 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, |
4563 | ac->highest_zoneidx, ac->nodemask) { | |
0a0337e0 | 4564 | unsigned long available; |
ede37713 | 4565 | unsigned long reclaimable; |
d379f01d MH |
4566 | unsigned long min_wmark = min_wmark_pages(zone); |
4567 | bool wmark; | |
0a0337e0 | 4568 | |
5a1c84b4 | 4569 | available = reclaimable = zone_reclaimable_pages(zone); |
5a1c84b4 | 4570 | available += zone_page_state_snapshot(zone, NR_FREE_PAGES); |
0a0337e0 MH |
4571 | |
4572 | /* | |
491d79ae JW |
4573 | * Would the allocation succeed if we reclaimed all |
4574 | * reclaimable pages? | |
0a0337e0 | 4575 | */ |
d379f01d | 4576 | wmark = __zone_watermark_ok(zone, order, min_wmark, |
97a225e6 | 4577 | ac->highest_zoneidx, alloc_flags, available); |
d379f01d MH |
4578 | trace_reclaim_retry_zone(z, order, reclaimable, |
4579 | available, min_wmark, *no_progress_loops, wmark); | |
4580 | if (wmark) { | |
ede37713 MH |
4581 | /* |
4582 | * If we didn't make any progress and have a lot of | |
4583 | * dirty + writeback pages then we should wait for | |
4584 | * an IO to complete to slow down the reclaim and | |
4585 | * prevent from pre mature OOM | |
4586 | */ | |
4587 | if (!did_some_progress) { | |
11fb9989 | 4588 | unsigned long write_pending; |
ede37713 | 4589 | |
5a1c84b4 MG |
4590 | write_pending = zone_page_state_snapshot(zone, |
4591 | NR_ZONE_WRITE_PENDING); | |
ede37713 | 4592 | |
11fb9989 | 4593 | if (2 * write_pending > reclaimable) { |
ede37713 MH |
4594 | congestion_wait(BLK_RW_ASYNC, HZ/10); |
4595 | return true; | |
4596 | } | |
4597 | } | |
5a1c84b4 | 4598 | |
15f570bf MH |
4599 | ret = true; |
4600 | goto out; | |
0a0337e0 MH |
4601 | } |
4602 | } | |
4603 | ||
15f570bf MH |
4604 | out: |
4605 | /* | |
4606 | * Memory allocation/reclaim might be called from a WQ context and the | |
4607 | * current implementation of the WQ concurrency control doesn't | |
4608 | * recognize that a particular WQ is congested if the worker thread is | |
4609 | * looping without ever sleeping. Therefore we have to do a short sleep | |
4610 | * here rather than calling cond_resched(). | |
4611 | */ | |
4612 | if (current->flags & PF_WQ_WORKER) | |
4613 | schedule_timeout_uninterruptible(1); | |
4614 | else | |
4615 | cond_resched(); | |
4616 | return ret; | |
0a0337e0 MH |
4617 | } |
4618 | ||
902b6281 VB |
4619 | static inline bool |
4620 | check_retry_cpuset(int cpuset_mems_cookie, struct alloc_context *ac) | |
4621 | { | |
4622 | /* | |
4623 | * It's possible that cpuset's mems_allowed and the nodemask from | |
4624 | * mempolicy don't intersect. This should be normally dealt with by | |
4625 | * policy_nodemask(), but it's possible to race with cpuset update in | |
4626 | * such a way the check therein was true, and then it became false | |
4627 | * before we got our cpuset_mems_cookie here. | |
4628 | * This assumes that for all allocations, ac->nodemask can come only | |
4629 | * from MPOL_BIND mempolicy (whose documented semantics is to be ignored | |
4630 | * when it does not intersect with the cpuset restrictions) or the | |
4631 | * caller can deal with a violated nodemask. | |
4632 | */ | |
4633 | if (cpusets_enabled() && ac->nodemask && | |
4634 | !cpuset_nodemask_valid_mems_allowed(ac->nodemask)) { | |
4635 | ac->nodemask = NULL; | |
4636 | return true; | |
4637 | } | |
4638 | ||
4639 | /* | |
4640 | * When updating a task's mems_allowed or mempolicy nodemask, it is | |
4641 | * possible to race with parallel threads in such a way that our | |
4642 | * allocation can fail while the mask is being updated. If we are about | |
4643 | * to fail, check if the cpuset changed during allocation and if so, | |
4644 | * retry. | |
4645 | */ | |
4646 | if (read_mems_allowed_retry(cpuset_mems_cookie)) | |
4647 | return true; | |
4648 | ||
4649 | return false; | |
4650 | } | |
4651 | ||
11e33f6a MG |
4652 | static inline struct page * |
4653 | __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 4654 | struct alloc_context *ac) |
11e33f6a | 4655 | { |
d0164adc | 4656 | bool can_direct_reclaim = gfp_mask & __GFP_DIRECT_RECLAIM; |
282722b0 | 4657 | const bool costly_order = order > PAGE_ALLOC_COSTLY_ORDER; |
11e33f6a | 4658 | struct page *page = NULL; |
c603844b | 4659 | unsigned int alloc_flags; |
11e33f6a | 4660 | unsigned long did_some_progress; |
5ce9bfef | 4661 | enum compact_priority compact_priority; |
c5d01d0d | 4662 | enum compact_result compact_result; |
5ce9bfef VB |
4663 | int compaction_retries; |
4664 | int no_progress_loops; | |
5ce9bfef | 4665 | unsigned int cpuset_mems_cookie; |
cd04ae1e | 4666 | int reserve_flags; |
1da177e4 | 4667 | |
d0164adc MG |
4668 | /* |
4669 | * We also sanity check to catch abuse of atomic reserves being used by | |
4670 | * callers that are not in atomic context. | |
4671 | */ | |
4672 | if (WARN_ON_ONCE((gfp_mask & (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM)) == | |
4673 | (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM))) | |
4674 | gfp_mask &= ~__GFP_ATOMIC; | |
4675 | ||
5ce9bfef VB |
4676 | retry_cpuset: |
4677 | compaction_retries = 0; | |
4678 | no_progress_loops = 0; | |
4679 | compact_priority = DEF_COMPACT_PRIORITY; | |
4680 | cpuset_mems_cookie = read_mems_allowed_begin(); | |
9a67f648 MH |
4681 | |
4682 | /* | |
4683 | * The fast path uses conservative alloc_flags to succeed only until | |
4684 | * kswapd needs to be woken up, and to avoid the cost of setting up | |
4685 | * alloc_flags precisely. So we do that now. | |
4686 | */ | |
4687 | alloc_flags = gfp_to_alloc_flags(gfp_mask); | |
4688 | ||
e47483bc VB |
4689 | /* |
4690 | * We need to recalculate the starting point for the zonelist iterator | |
4691 | * because we might have used different nodemask in the fast path, or | |
4692 | * there was a cpuset modification and we are retrying - otherwise we | |
4693 | * could end up iterating over non-eligible zones endlessly. | |
4694 | */ | |
4695 | ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, | |
97a225e6 | 4696 | ac->highest_zoneidx, ac->nodemask); |
e47483bc VB |
4697 | if (!ac->preferred_zoneref->zone) |
4698 | goto nopage; | |
4699 | ||
0a79cdad | 4700 | if (alloc_flags & ALLOC_KSWAPD) |
5ecd9d40 | 4701 | wake_all_kswapds(order, gfp_mask, ac); |
23771235 VB |
4702 | |
4703 | /* | |
4704 | * The adjusted alloc_flags might result in immediate success, so try | |
4705 | * that first | |
4706 | */ | |
4707 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); | |
4708 | if (page) | |
4709 | goto got_pg; | |
4710 | ||
a8161d1e VB |
4711 | /* |
4712 | * For costly allocations, try direct compaction first, as it's likely | |
282722b0 VB |
4713 | * that we have enough base pages and don't need to reclaim. For non- |
4714 | * movable high-order allocations, do that as well, as compaction will | |
4715 | * try prevent permanent fragmentation by migrating from blocks of the | |
4716 | * same migratetype. | |
4717 | * Don't try this for allocations that are allowed to ignore | |
4718 | * watermarks, as the ALLOC_NO_WATERMARKS attempt didn't yet happen. | |
a8161d1e | 4719 | */ |
282722b0 VB |
4720 | if (can_direct_reclaim && |
4721 | (costly_order || | |
4722 | (order > 0 && ac->migratetype != MIGRATE_MOVABLE)) | |
4723 | && !gfp_pfmemalloc_allowed(gfp_mask)) { | |
a8161d1e VB |
4724 | page = __alloc_pages_direct_compact(gfp_mask, order, |
4725 | alloc_flags, ac, | |
a5508cd8 | 4726 | INIT_COMPACT_PRIORITY, |
a8161d1e VB |
4727 | &compact_result); |
4728 | if (page) | |
4729 | goto got_pg; | |
4730 | ||
cc638f32 VB |
4731 | /* |
4732 | * Checks for costly allocations with __GFP_NORETRY, which | |
4733 | * includes some THP page fault allocations | |
4734 | */ | |
4735 | if (costly_order && (gfp_mask & __GFP_NORETRY)) { | |
b39d0ee2 DR |
4736 | /* |
4737 | * If allocating entire pageblock(s) and compaction | |
4738 | * failed because all zones are below low watermarks | |
4739 | * or is prohibited because it recently failed at this | |
3f36d866 DR |
4740 | * order, fail immediately unless the allocator has |
4741 | * requested compaction and reclaim retry. | |
b39d0ee2 DR |
4742 | * |
4743 | * Reclaim is | |
4744 | * - potentially very expensive because zones are far | |
4745 | * below their low watermarks or this is part of very | |
4746 | * bursty high order allocations, | |
4747 | * - not guaranteed to help because isolate_freepages() | |
4748 | * may not iterate over freed pages as part of its | |
4749 | * linear scan, and | |
4750 | * - unlikely to make entire pageblocks free on its | |
4751 | * own. | |
4752 | */ | |
4753 | if (compact_result == COMPACT_SKIPPED || | |
4754 | compact_result == COMPACT_DEFERRED) | |
4755 | goto nopage; | |
a8161d1e | 4756 | |
a8161d1e | 4757 | /* |
3eb2771b VB |
4758 | * Looks like reclaim/compaction is worth trying, but |
4759 | * sync compaction could be very expensive, so keep | |
25160354 | 4760 | * using async compaction. |
a8161d1e | 4761 | */ |
a5508cd8 | 4762 | compact_priority = INIT_COMPACT_PRIORITY; |
a8161d1e VB |
4763 | } |
4764 | } | |
23771235 | 4765 | |
31a6c190 | 4766 | retry: |
23771235 | 4767 | /* Ensure kswapd doesn't accidentally go to sleep as long as we loop */ |
0a79cdad | 4768 | if (alloc_flags & ALLOC_KSWAPD) |
5ecd9d40 | 4769 | wake_all_kswapds(order, gfp_mask, ac); |
31a6c190 | 4770 | |
cd04ae1e MH |
4771 | reserve_flags = __gfp_pfmemalloc_flags(gfp_mask); |
4772 | if (reserve_flags) | |
8510e69c | 4773 | alloc_flags = current_alloc_flags(gfp_mask, reserve_flags); |
23771235 | 4774 | |
e46e7b77 | 4775 | /* |
d6a24df0 VB |
4776 | * Reset the nodemask and zonelist iterators if memory policies can be |
4777 | * ignored. These allocations are high priority and system rather than | |
4778 | * user oriented. | |
e46e7b77 | 4779 | */ |
cd04ae1e | 4780 | if (!(alloc_flags & ALLOC_CPUSET) || reserve_flags) { |
d6a24df0 | 4781 | ac->nodemask = NULL; |
e46e7b77 | 4782 | ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, |
97a225e6 | 4783 | ac->highest_zoneidx, ac->nodemask); |
e46e7b77 MG |
4784 | } |
4785 | ||
23771235 | 4786 | /* Attempt with potentially adjusted zonelist and alloc_flags */ |
31a6c190 | 4787 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); |
7fb1d9fc RS |
4788 | if (page) |
4789 | goto got_pg; | |
1da177e4 | 4790 | |
d0164adc | 4791 | /* Caller is not willing to reclaim, we can't balance anything */ |
9a67f648 | 4792 | if (!can_direct_reclaim) |
1da177e4 LT |
4793 | goto nopage; |
4794 | ||
9a67f648 MH |
4795 | /* Avoid recursion of direct reclaim */ |
4796 | if (current->flags & PF_MEMALLOC) | |
6583bb64 DR |
4797 | goto nopage; |
4798 | ||
a8161d1e VB |
4799 | /* Try direct reclaim and then allocating */ |
4800 | page = __alloc_pages_direct_reclaim(gfp_mask, order, alloc_flags, ac, | |
4801 | &did_some_progress); | |
4802 | if (page) | |
4803 | goto got_pg; | |
4804 | ||
4805 | /* Try direct compaction and then allocating */ | |
a9263751 | 4806 | page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, ac, |
a5508cd8 | 4807 | compact_priority, &compact_result); |
56de7263 MG |
4808 | if (page) |
4809 | goto got_pg; | |
75f30861 | 4810 | |
9083905a JW |
4811 | /* Do not loop if specifically requested */ |
4812 | if (gfp_mask & __GFP_NORETRY) | |
a8161d1e | 4813 | goto nopage; |
9083905a | 4814 | |
0a0337e0 MH |
4815 | /* |
4816 | * Do not retry costly high order allocations unless they are | |
dcda9b04 | 4817 | * __GFP_RETRY_MAYFAIL |
0a0337e0 | 4818 | */ |
dcda9b04 | 4819 | if (costly_order && !(gfp_mask & __GFP_RETRY_MAYFAIL)) |
a8161d1e | 4820 | goto nopage; |
0a0337e0 | 4821 | |
0a0337e0 | 4822 | if (should_reclaim_retry(gfp_mask, order, ac, alloc_flags, |
423b452e | 4823 | did_some_progress > 0, &no_progress_loops)) |
0a0337e0 MH |
4824 | goto retry; |
4825 | ||
33c2d214 MH |
4826 | /* |
4827 | * It doesn't make any sense to retry for the compaction if the order-0 | |
4828 | * reclaim is not able to make any progress because the current | |
4829 | * implementation of the compaction depends on the sufficient amount | |
4830 | * of free memory (see __compaction_suitable) | |
4831 | */ | |
4832 | if (did_some_progress > 0 && | |
86a294a8 | 4833 | should_compact_retry(ac, order, alloc_flags, |
a5508cd8 | 4834 | compact_result, &compact_priority, |
d9436498 | 4835 | &compaction_retries)) |
33c2d214 MH |
4836 | goto retry; |
4837 | ||
902b6281 VB |
4838 | |
4839 | /* Deal with possible cpuset update races before we start OOM killing */ | |
4840 | if (check_retry_cpuset(cpuset_mems_cookie, ac)) | |
e47483bc VB |
4841 | goto retry_cpuset; |
4842 | ||
9083905a JW |
4843 | /* Reclaim has failed us, start killing things */ |
4844 | page = __alloc_pages_may_oom(gfp_mask, order, ac, &did_some_progress); | |
4845 | if (page) | |
4846 | goto got_pg; | |
4847 | ||
9a67f648 | 4848 | /* Avoid allocations with no watermarks from looping endlessly */ |
cd04ae1e | 4849 | if (tsk_is_oom_victim(current) && |
8510e69c | 4850 | (alloc_flags & ALLOC_OOM || |
c288983d | 4851 | (gfp_mask & __GFP_NOMEMALLOC))) |
9a67f648 MH |
4852 | goto nopage; |
4853 | ||
9083905a | 4854 | /* Retry as long as the OOM killer is making progress */ |
0a0337e0 MH |
4855 | if (did_some_progress) { |
4856 | no_progress_loops = 0; | |
9083905a | 4857 | goto retry; |
0a0337e0 | 4858 | } |
9083905a | 4859 | |
1da177e4 | 4860 | nopage: |
902b6281 VB |
4861 | /* Deal with possible cpuset update races before we fail */ |
4862 | if (check_retry_cpuset(cpuset_mems_cookie, ac)) | |
5ce9bfef VB |
4863 | goto retry_cpuset; |
4864 | ||
9a67f648 MH |
4865 | /* |
4866 | * Make sure that __GFP_NOFAIL request doesn't leak out and make sure | |
4867 | * we always retry | |
4868 | */ | |
4869 | if (gfp_mask & __GFP_NOFAIL) { | |
4870 | /* | |
4871 | * All existing users of the __GFP_NOFAIL are blockable, so warn | |
4872 | * of any new users that actually require GFP_NOWAIT | |
4873 | */ | |
4874 | if (WARN_ON_ONCE(!can_direct_reclaim)) | |
4875 | goto fail; | |
4876 | ||
4877 | /* | |
4878 | * PF_MEMALLOC request from this context is rather bizarre | |
4879 | * because we cannot reclaim anything and only can loop waiting | |
4880 | * for somebody to do a work for us | |
4881 | */ | |
4882 | WARN_ON_ONCE(current->flags & PF_MEMALLOC); | |
4883 | ||
4884 | /* | |
4885 | * non failing costly orders are a hard requirement which we | |
4886 | * are not prepared for much so let's warn about these users | |
4887 | * so that we can identify them and convert them to something | |
4888 | * else. | |
4889 | */ | |
4890 | WARN_ON_ONCE(order > PAGE_ALLOC_COSTLY_ORDER); | |
4891 | ||
6c18ba7a MH |
4892 | /* |
4893 | * Help non-failing allocations by giving them access to memory | |
4894 | * reserves but do not use ALLOC_NO_WATERMARKS because this | |
4895 | * could deplete whole memory reserves which would just make | |
4896 | * the situation worse | |
4897 | */ | |
4898 | page = __alloc_pages_cpuset_fallback(gfp_mask, order, ALLOC_HARDER, ac); | |
4899 | if (page) | |
4900 | goto got_pg; | |
4901 | ||
9a67f648 MH |
4902 | cond_resched(); |
4903 | goto retry; | |
4904 | } | |
4905 | fail: | |
a8e99259 | 4906 | warn_alloc(gfp_mask, ac->nodemask, |
7877cdcc | 4907 | "page allocation failure: order:%u", order); |
1da177e4 | 4908 | got_pg: |
072bb0aa | 4909 | return page; |
1da177e4 | 4910 | } |
11e33f6a | 4911 | |
9cd75558 | 4912 | static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order, |
04ec6264 | 4913 | int preferred_nid, nodemask_t *nodemask, |
9cd75558 MG |
4914 | struct alloc_context *ac, gfp_t *alloc_mask, |
4915 | unsigned int *alloc_flags) | |
11e33f6a | 4916 | { |
97a225e6 | 4917 | ac->highest_zoneidx = gfp_zone(gfp_mask); |
04ec6264 | 4918 | ac->zonelist = node_zonelist(preferred_nid, gfp_mask); |
9cd75558 | 4919 | ac->nodemask = nodemask; |
01c0bfe0 | 4920 | ac->migratetype = gfp_migratetype(gfp_mask); |
11e33f6a | 4921 | |
682a3385 | 4922 | if (cpusets_enabled()) { |
9cd75558 | 4923 | *alloc_mask |= __GFP_HARDWALL; |
182f3d7a MS |
4924 | /* |
4925 | * When we are in the interrupt context, it is irrelevant | |
4926 | * to the current task context. It means that any node ok. | |
4927 | */ | |
4928 | if (!in_interrupt() && !ac->nodemask) | |
9cd75558 | 4929 | ac->nodemask = &cpuset_current_mems_allowed; |
51047820 VB |
4930 | else |
4931 | *alloc_flags |= ALLOC_CPUSET; | |
682a3385 MG |
4932 | } |
4933 | ||
d92a8cfc PZ |
4934 | fs_reclaim_acquire(gfp_mask); |
4935 | fs_reclaim_release(gfp_mask); | |
11e33f6a | 4936 | |
d0164adc | 4937 | might_sleep_if(gfp_mask & __GFP_DIRECT_RECLAIM); |
11e33f6a MG |
4938 | |
4939 | if (should_fail_alloc_page(gfp_mask, order)) | |
9cd75558 | 4940 | return false; |
11e33f6a | 4941 | |
8510e69c | 4942 | *alloc_flags = current_alloc_flags(gfp_mask, *alloc_flags); |
d883c6cf | 4943 | |
c9ab0c4f | 4944 | /* Dirty zone balancing only done in the fast path */ |
9cd75558 | 4945 | ac->spread_dirty_pages = (gfp_mask & __GFP_WRITE); |
c9ab0c4f | 4946 | |
e46e7b77 MG |
4947 | /* |
4948 | * The preferred zone is used for statistics but crucially it is | |
4949 | * also used as the starting point for the zonelist iterator. It | |
4950 | * may get reset for allocations that ignore memory policies. | |
4951 | */ | |
9cd75558 | 4952 | ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, |
97a225e6 | 4953 | ac->highest_zoneidx, ac->nodemask); |
a0622d05 MN |
4954 | |
4955 | return true; | |
9cd75558 MG |
4956 | } |
4957 | ||
4958 | /* | |
4959 | * This is the 'heart' of the zoned buddy allocator. | |
4960 | */ | |
4961 | struct page * | |
04ec6264 VB |
4962 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid, |
4963 | nodemask_t *nodemask) | |
9cd75558 MG |
4964 | { |
4965 | struct page *page; | |
4966 | unsigned int alloc_flags = ALLOC_WMARK_LOW; | |
f19360f0 | 4967 | gfp_t alloc_mask; /* The gfp_t that was actually used for allocation */ |
9cd75558 MG |
4968 | struct alloc_context ac = { }; |
4969 | ||
c63ae43b MH |
4970 | /* |
4971 | * There are several places where we assume that the order value is sane | |
4972 | * so bail out early if the request is out of bound. | |
4973 | */ | |
4974 | if (unlikely(order >= MAX_ORDER)) { | |
4975 | WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN)); | |
4976 | return NULL; | |
4977 | } | |
4978 | ||
9cd75558 | 4979 | gfp_mask &= gfp_allowed_mask; |
f19360f0 | 4980 | alloc_mask = gfp_mask; |
04ec6264 | 4981 | if (!prepare_alloc_pages(gfp_mask, order, preferred_nid, nodemask, &ac, &alloc_mask, &alloc_flags)) |
9cd75558 MG |
4982 | return NULL; |
4983 | ||
6bb15450 MG |
4984 | /* |
4985 | * Forbid the first pass from falling back to types that fragment | |
4986 | * memory until all local zones are considered. | |
4987 | */ | |
0a79cdad | 4988 | alloc_flags |= alloc_flags_nofragment(ac.preferred_zoneref->zone, gfp_mask); |
6bb15450 | 4989 | |
5117f45d | 4990 | /* First allocation attempt */ |
a9263751 | 4991 | page = get_page_from_freelist(alloc_mask, order, alloc_flags, &ac); |
4fcb0971 MG |
4992 | if (likely(page)) |
4993 | goto out; | |
11e33f6a | 4994 | |
4fcb0971 | 4995 | /* |
7dea19f9 MH |
4996 | * Apply scoped allocation constraints. This is mainly about GFP_NOFS |
4997 | * resp. GFP_NOIO which has to be inherited for all allocation requests | |
4998 | * from a particular context which has been marked by | |
4999 | * memalloc_no{fs,io}_{save,restore}. | |
4fcb0971 | 5000 | */ |
7dea19f9 | 5001 | alloc_mask = current_gfp_context(gfp_mask); |
4fcb0971 | 5002 | ac.spread_dirty_pages = false; |
23f086f9 | 5003 | |
4741526b MG |
5004 | /* |
5005 | * Restore the original nodemask if it was potentially replaced with | |
5006 | * &cpuset_current_mems_allowed to optimize the fast-path attempt. | |
5007 | */ | |
97ce86f9 | 5008 | ac.nodemask = nodemask; |
16096c25 | 5009 | |
4fcb0971 | 5010 | page = __alloc_pages_slowpath(alloc_mask, order, &ac); |
cc9a6c87 | 5011 | |
4fcb0971 | 5012 | out: |
c4159a75 | 5013 | if (memcg_kmem_enabled() && (gfp_mask & __GFP_ACCOUNT) && page && |
f4b00eab | 5014 | unlikely(__memcg_kmem_charge_page(page, gfp_mask, order) != 0)) { |
c4159a75 VD |
5015 | __free_pages(page, order); |
5016 | page = NULL; | |
4949148a VD |
5017 | } |
5018 | ||
4fcb0971 MG |
5019 | trace_mm_page_alloc(page, order, alloc_mask, ac.migratetype); |
5020 | ||
11e33f6a | 5021 | return page; |
1da177e4 | 5022 | } |
d239171e | 5023 | EXPORT_SYMBOL(__alloc_pages_nodemask); |
1da177e4 LT |
5024 | |
5025 | /* | |
9ea9a680 MH |
5026 | * Common helper functions. Never use with __GFP_HIGHMEM because the returned |
5027 | * address cannot represent highmem pages. Use alloc_pages and then kmap if | |
5028 | * you need to access high mem. | |
1da177e4 | 5029 | */ |
920c7a5d | 5030 | unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 5031 | { |
945a1113 AM |
5032 | struct page *page; |
5033 | ||
9ea9a680 | 5034 | page = alloc_pages(gfp_mask & ~__GFP_HIGHMEM, order); |
1da177e4 LT |
5035 | if (!page) |
5036 | return 0; | |
5037 | return (unsigned long) page_address(page); | |
5038 | } | |
1da177e4 LT |
5039 | EXPORT_SYMBOL(__get_free_pages); |
5040 | ||
920c7a5d | 5041 | unsigned long get_zeroed_page(gfp_t gfp_mask) |
1da177e4 | 5042 | { |
945a1113 | 5043 | return __get_free_pages(gfp_mask | __GFP_ZERO, 0); |
1da177e4 | 5044 | } |
1da177e4 LT |
5045 | EXPORT_SYMBOL(get_zeroed_page); |
5046 | ||
742aa7fb | 5047 | static inline void free_the_page(struct page *page, unsigned int order) |
1da177e4 | 5048 | { |
742aa7fb AL |
5049 | if (order == 0) /* Via pcp? */ |
5050 | free_unref_page(page); | |
5051 | else | |
7fef431b | 5052 | __free_pages_ok(page, order, FPI_NONE); |
1da177e4 LT |
5053 | } |
5054 | ||
7f194fbb MWO |
5055 | /** |
5056 | * __free_pages - Free pages allocated with alloc_pages(). | |
5057 | * @page: The page pointer returned from alloc_pages(). | |
5058 | * @order: The order of the allocation. | |
5059 | * | |
5060 | * This function can free multi-page allocations that are not compound | |
5061 | * pages. It does not check that the @order passed in matches that of | |
5062 | * the allocation, so it is easy to leak memory. Freeing more memory | |
5063 | * than was allocated will probably emit a warning. | |
5064 | * | |
5065 | * If the last reference to this page is speculative, it will be released | |
5066 | * by put_page() which only frees the first page of a non-compound | |
5067 | * allocation. To prevent the remaining pages from being leaked, we free | |
5068 | * the subsequent pages here. If you want to use the page's reference | |
5069 | * count to decide when to free the allocation, you should allocate a | |
5070 | * compound page, and use put_page() instead of __free_pages(). | |
5071 | * | |
5072 | * Context: May be called in interrupt context or while holding a normal | |
5073 | * spinlock, but not in NMI context or while holding a raw spinlock. | |
5074 | */ | |
742aa7fb AL |
5075 | void __free_pages(struct page *page, unsigned int order) |
5076 | { | |
5077 | if (put_page_testzero(page)) | |
5078 | free_the_page(page, order); | |
e320d301 MWO |
5079 | else if (!PageHead(page)) |
5080 | while (order-- > 0) | |
5081 | free_the_page(page + (1 << order), order); | |
742aa7fb | 5082 | } |
1da177e4 LT |
5083 | EXPORT_SYMBOL(__free_pages); |
5084 | ||
920c7a5d | 5085 | void free_pages(unsigned long addr, unsigned int order) |
1da177e4 LT |
5086 | { |
5087 | if (addr != 0) { | |
725d704e | 5088 | VM_BUG_ON(!virt_addr_valid((void *)addr)); |
1da177e4 LT |
5089 | __free_pages(virt_to_page((void *)addr), order); |
5090 | } | |
5091 | } | |
5092 | ||
5093 | EXPORT_SYMBOL(free_pages); | |
5094 | ||
b63ae8ca AD |
5095 | /* |
5096 | * Page Fragment: | |
5097 | * An arbitrary-length arbitrary-offset area of memory which resides | |
5098 | * within a 0 or higher order page. Multiple fragments within that page | |
5099 | * are individually refcounted, in the page's reference counter. | |
5100 | * | |
5101 | * The page_frag functions below provide a simple allocation framework for | |
5102 | * page fragments. This is used by the network stack and network device | |
5103 | * drivers to provide a backing region of memory for use as either an | |
5104 | * sk_buff->head, or to be used in the "frags" portion of skb_shared_info. | |
5105 | */ | |
2976db80 AD |
5106 | static struct page *__page_frag_cache_refill(struct page_frag_cache *nc, |
5107 | gfp_t gfp_mask) | |
b63ae8ca AD |
5108 | { |
5109 | struct page *page = NULL; | |
5110 | gfp_t gfp = gfp_mask; | |
5111 | ||
5112 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
5113 | gfp_mask |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY | | |
5114 | __GFP_NOMEMALLOC; | |
5115 | page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, | |
5116 | PAGE_FRAG_CACHE_MAX_ORDER); | |
5117 | nc->size = page ? PAGE_FRAG_CACHE_MAX_SIZE : PAGE_SIZE; | |
5118 | #endif | |
5119 | if (unlikely(!page)) | |
5120 | page = alloc_pages_node(NUMA_NO_NODE, gfp, 0); | |
5121 | ||
5122 | nc->va = page ? page_address(page) : NULL; | |
5123 | ||
5124 | return page; | |
5125 | } | |
5126 | ||
2976db80 | 5127 | void __page_frag_cache_drain(struct page *page, unsigned int count) |
44fdffd7 AD |
5128 | { |
5129 | VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); | |
5130 | ||
742aa7fb AL |
5131 | if (page_ref_sub_and_test(page, count)) |
5132 | free_the_page(page, compound_order(page)); | |
44fdffd7 | 5133 | } |
2976db80 | 5134 | EXPORT_SYMBOL(__page_frag_cache_drain); |
44fdffd7 | 5135 | |
8c2dd3e4 AD |
5136 | void *page_frag_alloc(struct page_frag_cache *nc, |
5137 | unsigned int fragsz, gfp_t gfp_mask) | |
b63ae8ca AD |
5138 | { |
5139 | unsigned int size = PAGE_SIZE; | |
5140 | struct page *page; | |
5141 | int offset; | |
5142 | ||
5143 | if (unlikely(!nc->va)) { | |
5144 | refill: | |
2976db80 | 5145 | page = __page_frag_cache_refill(nc, gfp_mask); |
b63ae8ca AD |
5146 | if (!page) |
5147 | return NULL; | |
5148 | ||
5149 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
5150 | /* if size can vary use size else just use PAGE_SIZE */ | |
5151 | size = nc->size; | |
5152 | #endif | |
5153 | /* Even if we own the page, we do not use atomic_set(). | |
5154 | * This would break get_page_unless_zero() users. | |
5155 | */ | |
86447726 | 5156 | page_ref_add(page, PAGE_FRAG_CACHE_MAX_SIZE); |
b63ae8ca AD |
5157 | |
5158 | /* reset page count bias and offset to start of new frag */ | |
2f064f34 | 5159 | nc->pfmemalloc = page_is_pfmemalloc(page); |
86447726 | 5160 | nc->pagecnt_bias = PAGE_FRAG_CACHE_MAX_SIZE + 1; |
b63ae8ca AD |
5161 | nc->offset = size; |
5162 | } | |
5163 | ||
5164 | offset = nc->offset - fragsz; | |
5165 | if (unlikely(offset < 0)) { | |
5166 | page = virt_to_page(nc->va); | |
5167 | ||
fe896d18 | 5168 | if (!page_ref_sub_and_test(page, nc->pagecnt_bias)) |
b63ae8ca AD |
5169 | goto refill; |
5170 | ||
d8c19014 DZ |
5171 | if (unlikely(nc->pfmemalloc)) { |
5172 | free_the_page(page, compound_order(page)); | |
5173 | goto refill; | |
5174 | } | |
5175 | ||
b63ae8ca AD |
5176 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) |
5177 | /* if size can vary use size else just use PAGE_SIZE */ | |
5178 | size = nc->size; | |
5179 | #endif | |
5180 | /* OK, page count is 0, we can safely set it */ | |
86447726 | 5181 | set_page_count(page, PAGE_FRAG_CACHE_MAX_SIZE + 1); |
b63ae8ca AD |
5182 | |
5183 | /* reset page count bias and offset to start of new frag */ | |
86447726 | 5184 | nc->pagecnt_bias = PAGE_FRAG_CACHE_MAX_SIZE + 1; |
b63ae8ca AD |
5185 | offset = size - fragsz; |
5186 | } | |
5187 | ||
5188 | nc->pagecnt_bias--; | |
5189 | nc->offset = offset; | |
5190 | ||
5191 | return nc->va + offset; | |
5192 | } | |
8c2dd3e4 | 5193 | EXPORT_SYMBOL(page_frag_alloc); |
b63ae8ca AD |
5194 | |
5195 | /* | |
5196 | * Frees a page fragment allocated out of either a compound or order 0 page. | |
5197 | */ | |
8c2dd3e4 | 5198 | void page_frag_free(void *addr) |
b63ae8ca AD |
5199 | { |
5200 | struct page *page = virt_to_head_page(addr); | |
5201 | ||
742aa7fb AL |
5202 | if (unlikely(put_page_testzero(page))) |
5203 | free_the_page(page, compound_order(page)); | |
b63ae8ca | 5204 | } |
8c2dd3e4 | 5205 | EXPORT_SYMBOL(page_frag_free); |
b63ae8ca | 5206 | |
d00181b9 KS |
5207 | static void *make_alloc_exact(unsigned long addr, unsigned int order, |
5208 | size_t size) | |
ee85c2e1 AK |
5209 | { |
5210 | if (addr) { | |
5211 | unsigned long alloc_end = addr + (PAGE_SIZE << order); | |
5212 | unsigned long used = addr + PAGE_ALIGN(size); | |
5213 | ||
5214 | split_page(virt_to_page((void *)addr), order); | |
5215 | while (used < alloc_end) { | |
5216 | free_page(used); | |
5217 | used += PAGE_SIZE; | |
5218 | } | |
5219 | } | |
5220 | return (void *)addr; | |
5221 | } | |
5222 | ||
2be0ffe2 TT |
5223 | /** |
5224 | * alloc_pages_exact - allocate an exact number physically-contiguous pages. | |
5225 | * @size: the number of bytes to allocate | |
63931eb9 | 5226 | * @gfp_mask: GFP flags for the allocation, must not contain __GFP_COMP |
2be0ffe2 TT |
5227 | * |
5228 | * This function is similar to alloc_pages(), except that it allocates the | |
5229 | * minimum number of pages to satisfy the request. alloc_pages() can only | |
5230 | * allocate memory in power-of-two pages. | |
5231 | * | |
5232 | * This function is also limited by MAX_ORDER. | |
5233 | * | |
5234 | * Memory allocated by this function must be released by free_pages_exact(). | |
a862f68a MR |
5235 | * |
5236 | * Return: pointer to the allocated area or %NULL in case of error. | |
2be0ffe2 TT |
5237 | */ |
5238 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask) | |
5239 | { | |
5240 | unsigned int order = get_order(size); | |
5241 | unsigned long addr; | |
5242 | ||
63931eb9 VB |
5243 | if (WARN_ON_ONCE(gfp_mask & __GFP_COMP)) |
5244 | gfp_mask &= ~__GFP_COMP; | |
5245 | ||
2be0ffe2 | 5246 | addr = __get_free_pages(gfp_mask, order); |
ee85c2e1 | 5247 | return make_alloc_exact(addr, order, size); |
2be0ffe2 TT |
5248 | } |
5249 | EXPORT_SYMBOL(alloc_pages_exact); | |
5250 | ||
ee85c2e1 AK |
5251 | /** |
5252 | * alloc_pages_exact_nid - allocate an exact number of physically-contiguous | |
5253 | * pages on a node. | |
b5e6ab58 | 5254 | * @nid: the preferred node ID where memory should be allocated |
ee85c2e1 | 5255 | * @size: the number of bytes to allocate |
63931eb9 | 5256 | * @gfp_mask: GFP flags for the allocation, must not contain __GFP_COMP |
ee85c2e1 AK |
5257 | * |
5258 | * Like alloc_pages_exact(), but try to allocate on node nid first before falling | |
5259 | * back. | |
a862f68a MR |
5260 | * |
5261 | * Return: pointer to the allocated area or %NULL in case of error. | |
ee85c2e1 | 5262 | */ |
e1931811 | 5263 | void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) |
ee85c2e1 | 5264 | { |
d00181b9 | 5265 | unsigned int order = get_order(size); |
63931eb9 VB |
5266 | struct page *p; |
5267 | ||
5268 | if (WARN_ON_ONCE(gfp_mask & __GFP_COMP)) | |
5269 | gfp_mask &= ~__GFP_COMP; | |
5270 | ||
5271 | p = alloc_pages_node(nid, gfp_mask, order); | |
ee85c2e1 AK |
5272 | if (!p) |
5273 | return NULL; | |
5274 | return make_alloc_exact((unsigned long)page_address(p), order, size); | |
5275 | } | |
ee85c2e1 | 5276 | |
2be0ffe2 TT |
5277 | /** |
5278 | * free_pages_exact - release memory allocated via alloc_pages_exact() | |
5279 | * @virt: the value returned by alloc_pages_exact. | |
5280 | * @size: size of allocation, same value as passed to alloc_pages_exact(). | |
5281 | * | |
5282 | * Release the memory allocated by a previous call to alloc_pages_exact. | |
5283 | */ | |
5284 | void free_pages_exact(void *virt, size_t size) | |
5285 | { | |
5286 | unsigned long addr = (unsigned long)virt; | |
5287 | unsigned long end = addr + PAGE_ALIGN(size); | |
5288 | ||
5289 | while (addr < end) { | |
5290 | free_page(addr); | |
5291 | addr += PAGE_SIZE; | |
5292 | } | |
5293 | } | |
5294 | EXPORT_SYMBOL(free_pages_exact); | |
5295 | ||
e0fb5815 ZY |
5296 | /** |
5297 | * nr_free_zone_pages - count number of pages beyond high watermark | |
5298 | * @offset: The zone index of the highest zone | |
5299 | * | |
a862f68a | 5300 | * nr_free_zone_pages() counts the number of pages which are beyond the |
e0fb5815 ZY |
5301 | * high watermark within all zones at or below a given zone index. For each |
5302 | * zone, the number of pages is calculated as: | |
0e056eb5 MCC |
5303 | * |
5304 | * nr_free_zone_pages = managed_pages - high_pages | |
a862f68a MR |
5305 | * |
5306 | * Return: number of pages beyond high watermark. | |
e0fb5815 | 5307 | */ |
ebec3862 | 5308 | static unsigned long nr_free_zone_pages(int offset) |
1da177e4 | 5309 | { |
dd1a239f | 5310 | struct zoneref *z; |
54a6eb5c MG |
5311 | struct zone *zone; |
5312 | ||
e310fd43 | 5313 | /* Just pick one node, since fallback list is circular */ |
ebec3862 | 5314 | unsigned long sum = 0; |
1da177e4 | 5315 | |
0e88460d | 5316 | struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL); |
1da177e4 | 5317 | |
54a6eb5c | 5318 | for_each_zone_zonelist(zone, z, zonelist, offset) { |
9705bea5 | 5319 | unsigned long size = zone_managed_pages(zone); |
41858966 | 5320 | unsigned long high = high_wmark_pages(zone); |
e310fd43 MB |
5321 | if (size > high) |
5322 | sum += size - high; | |
1da177e4 LT |
5323 | } |
5324 | ||
5325 | return sum; | |
5326 | } | |
5327 | ||
e0fb5815 ZY |
5328 | /** |
5329 | * nr_free_buffer_pages - count number of pages beyond high watermark | |
5330 | * | |
5331 | * nr_free_buffer_pages() counts the number of pages which are beyond the high | |
5332 | * watermark within ZONE_DMA and ZONE_NORMAL. | |
a862f68a MR |
5333 | * |
5334 | * Return: number of pages beyond high watermark within ZONE_DMA and | |
5335 | * ZONE_NORMAL. | |
1da177e4 | 5336 | */ |
ebec3862 | 5337 | unsigned long nr_free_buffer_pages(void) |
1da177e4 | 5338 | { |
af4ca457 | 5339 | return nr_free_zone_pages(gfp_zone(GFP_USER)); |
1da177e4 | 5340 | } |
c2f1a551 | 5341 | EXPORT_SYMBOL_GPL(nr_free_buffer_pages); |
1da177e4 | 5342 | |
08e0f6a9 | 5343 | static inline void show_node(struct zone *zone) |
1da177e4 | 5344 | { |
e5adfffc | 5345 | if (IS_ENABLED(CONFIG_NUMA)) |
25ba77c1 | 5346 | printk("Node %d ", zone_to_nid(zone)); |
1da177e4 | 5347 | } |
1da177e4 | 5348 | |
d02bd27b IR |
5349 | long si_mem_available(void) |
5350 | { | |
5351 | long available; | |
5352 | unsigned long pagecache; | |
5353 | unsigned long wmark_low = 0; | |
5354 | unsigned long pages[NR_LRU_LISTS]; | |
b29940c1 | 5355 | unsigned long reclaimable; |
d02bd27b IR |
5356 | struct zone *zone; |
5357 | int lru; | |
5358 | ||
5359 | for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) | |
2f95ff90 | 5360 | pages[lru] = global_node_page_state(NR_LRU_BASE + lru); |
d02bd27b IR |
5361 | |
5362 | for_each_zone(zone) | |
a9214443 | 5363 | wmark_low += low_wmark_pages(zone); |
d02bd27b IR |
5364 | |
5365 | /* | |
5366 | * Estimate the amount of memory available for userspace allocations, | |
5367 | * without causing swapping. | |
5368 | */ | |
c41f012a | 5369 | available = global_zone_page_state(NR_FREE_PAGES) - totalreserve_pages; |
d02bd27b IR |
5370 | |
5371 | /* | |
5372 | * Not all the page cache can be freed, otherwise the system will | |
5373 | * start swapping. Assume at least half of the page cache, or the | |
5374 | * low watermark worth of cache, needs to stay. | |
5375 | */ | |
5376 | pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; | |
5377 | pagecache -= min(pagecache / 2, wmark_low); | |
5378 | available += pagecache; | |
5379 | ||
5380 | /* | |
b29940c1 VB |
5381 | * Part of the reclaimable slab and other kernel memory consists of |
5382 | * items that are in use, and cannot be freed. Cap this estimate at the | |
5383 | * low watermark. | |
d02bd27b | 5384 | */ |
d42f3245 RG |
5385 | reclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B) + |
5386 | global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE); | |
b29940c1 | 5387 | available += reclaimable - min(reclaimable / 2, wmark_low); |
034ebf65 | 5388 | |
d02bd27b IR |
5389 | if (available < 0) |
5390 | available = 0; | |
5391 | return available; | |
5392 | } | |
5393 | EXPORT_SYMBOL_GPL(si_mem_available); | |
5394 | ||
1da177e4 LT |
5395 | void si_meminfo(struct sysinfo *val) |
5396 | { | |
ca79b0c2 | 5397 | val->totalram = totalram_pages(); |
11fb9989 | 5398 | val->sharedram = global_node_page_state(NR_SHMEM); |
c41f012a | 5399 | val->freeram = global_zone_page_state(NR_FREE_PAGES); |
1da177e4 | 5400 | val->bufferram = nr_blockdev_pages(); |
ca79b0c2 | 5401 | val->totalhigh = totalhigh_pages(); |
1da177e4 | 5402 | val->freehigh = nr_free_highpages(); |
1da177e4 LT |
5403 | val->mem_unit = PAGE_SIZE; |
5404 | } | |
5405 | ||
5406 | EXPORT_SYMBOL(si_meminfo); | |
5407 | ||
5408 | #ifdef CONFIG_NUMA | |
5409 | void si_meminfo_node(struct sysinfo *val, int nid) | |
5410 | { | |
cdd91a77 JL |
5411 | int zone_type; /* needs to be signed */ |
5412 | unsigned long managed_pages = 0; | |
fc2bd799 JK |
5413 | unsigned long managed_highpages = 0; |
5414 | unsigned long free_highpages = 0; | |
1da177e4 LT |
5415 | pg_data_t *pgdat = NODE_DATA(nid); |
5416 | ||
cdd91a77 | 5417 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) |
9705bea5 | 5418 | managed_pages += zone_managed_pages(&pgdat->node_zones[zone_type]); |
cdd91a77 | 5419 | val->totalram = managed_pages; |
11fb9989 | 5420 | val->sharedram = node_page_state(pgdat, NR_SHMEM); |
75ef7184 | 5421 | val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES); |
98d2b0eb | 5422 | #ifdef CONFIG_HIGHMEM |
fc2bd799 JK |
5423 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { |
5424 | struct zone *zone = &pgdat->node_zones[zone_type]; | |
5425 | ||
5426 | if (is_highmem(zone)) { | |
9705bea5 | 5427 | managed_highpages += zone_managed_pages(zone); |
fc2bd799 JK |
5428 | free_highpages += zone_page_state(zone, NR_FREE_PAGES); |
5429 | } | |
5430 | } | |
5431 | val->totalhigh = managed_highpages; | |
5432 | val->freehigh = free_highpages; | |
98d2b0eb | 5433 | #else |
fc2bd799 JK |
5434 | val->totalhigh = managed_highpages; |
5435 | val->freehigh = free_highpages; | |
98d2b0eb | 5436 | #endif |
1da177e4 LT |
5437 | val->mem_unit = PAGE_SIZE; |
5438 | } | |
5439 | #endif | |
5440 | ||
ddd588b5 | 5441 | /* |
7bf02ea2 DR |
5442 | * Determine whether the node should be displayed or not, depending on whether |
5443 | * SHOW_MEM_FILTER_NODES was passed to show_free_areas(). | |
ddd588b5 | 5444 | */ |
9af744d7 | 5445 | static bool show_mem_node_skip(unsigned int flags, int nid, nodemask_t *nodemask) |
ddd588b5 | 5446 | { |
ddd588b5 | 5447 | if (!(flags & SHOW_MEM_FILTER_NODES)) |
9af744d7 | 5448 | return false; |
ddd588b5 | 5449 | |
9af744d7 MH |
5450 | /* |
5451 | * no node mask - aka implicit memory numa policy. Do not bother with | |
5452 | * the synchronization - read_mems_allowed_begin - because we do not | |
5453 | * have to be precise here. | |
5454 | */ | |
5455 | if (!nodemask) | |
5456 | nodemask = &cpuset_current_mems_allowed; | |
5457 | ||
5458 | return !node_isset(nid, *nodemask); | |
ddd588b5 DR |
5459 | } |
5460 | ||
1da177e4 LT |
5461 | #define K(x) ((x) << (PAGE_SHIFT-10)) |
5462 | ||
377e4f16 RV |
5463 | static void show_migration_types(unsigned char type) |
5464 | { | |
5465 | static const char types[MIGRATE_TYPES] = { | |
5466 | [MIGRATE_UNMOVABLE] = 'U', | |
377e4f16 | 5467 | [MIGRATE_MOVABLE] = 'M', |
475a2f90 VB |
5468 | [MIGRATE_RECLAIMABLE] = 'E', |
5469 | [MIGRATE_HIGHATOMIC] = 'H', | |
377e4f16 RV |
5470 | #ifdef CONFIG_CMA |
5471 | [MIGRATE_CMA] = 'C', | |
5472 | #endif | |
194159fb | 5473 | #ifdef CONFIG_MEMORY_ISOLATION |
377e4f16 | 5474 | [MIGRATE_ISOLATE] = 'I', |
194159fb | 5475 | #endif |
377e4f16 RV |
5476 | }; |
5477 | char tmp[MIGRATE_TYPES + 1]; | |
5478 | char *p = tmp; | |
5479 | int i; | |
5480 | ||
5481 | for (i = 0; i < MIGRATE_TYPES; i++) { | |
5482 | if (type & (1 << i)) | |
5483 | *p++ = types[i]; | |
5484 | } | |
5485 | ||
5486 | *p = '\0'; | |
1f84a18f | 5487 | printk(KERN_CONT "(%s) ", tmp); |
377e4f16 RV |
5488 | } |
5489 | ||
1da177e4 LT |
5490 | /* |
5491 | * Show free area list (used inside shift_scroll-lock stuff) | |
5492 | * We also calculate the percentage fragmentation. We do this by counting the | |
5493 | * memory on each free list with the exception of the first item on the list. | |
d1bfcdb8 KK |
5494 | * |
5495 | * Bits in @filter: | |
5496 | * SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's | |
5497 | * cpuset. | |
1da177e4 | 5498 | */ |
9af744d7 | 5499 | void show_free_areas(unsigned int filter, nodemask_t *nodemask) |
1da177e4 | 5500 | { |
d1bfcdb8 | 5501 | unsigned long free_pcp = 0; |
c7241913 | 5502 | int cpu; |
1da177e4 | 5503 | struct zone *zone; |
599d0c95 | 5504 | pg_data_t *pgdat; |
1da177e4 | 5505 | |
ee99c71c | 5506 | for_each_populated_zone(zone) { |
9af744d7 | 5507 | if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask)) |
ddd588b5 | 5508 | continue; |
d1bfcdb8 | 5509 | |
761b0677 KK |
5510 | for_each_online_cpu(cpu) |
5511 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; | |
1da177e4 LT |
5512 | } |
5513 | ||
a731286d KM |
5514 | printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n" |
5515 | " active_file:%lu inactive_file:%lu isolated_file:%lu\n" | |
8d92890b | 5516 | " unevictable:%lu dirty:%lu writeback:%lu\n" |
d1bfcdb8 | 5517 | " slab_reclaimable:%lu slab_unreclaimable:%lu\n" |
d1ce749a | 5518 | " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n" |
d1bfcdb8 | 5519 | " free:%lu free_pcp:%lu free_cma:%lu\n", |
599d0c95 MG |
5520 | global_node_page_state(NR_ACTIVE_ANON), |
5521 | global_node_page_state(NR_INACTIVE_ANON), | |
5522 | global_node_page_state(NR_ISOLATED_ANON), | |
5523 | global_node_page_state(NR_ACTIVE_FILE), | |
5524 | global_node_page_state(NR_INACTIVE_FILE), | |
5525 | global_node_page_state(NR_ISOLATED_FILE), | |
5526 | global_node_page_state(NR_UNEVICTABLE), | |
11fb9989 MG |
5527 | global_node_page_state(NR_FILE_DIRTY), |
5528 | global_node_page_state(NR_WRITEBACK), | |
d42f3245 RG |
5529 | global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B), |
5530 | global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B), | |
50658e2e | 5531 | global_node_page_state(NR_FILE_MAPPED), |
11fb9989 | 5532 | global_node_page_state(NR_SHMEM), |
f0c0c115 | 5533 | global_node_page_state(NR_PAGETABLE), |
c41f012a MH |
5534 | global_zone_page_state(NR_BOUNCE), |
5535 | global_zone_page_state(NR_FREE_PAGES), | |
d1bfcdb8 | 5536 | free_pcp, |
c41f012a | 5537 | global_zone_page_state(NR_FREE_CMA_PAGES)); |
1da177e4 | 5538 | |
599d0c95 | 5539 | for_each_online_pgdat(pgdat) { |
9af744d7 | 5540 | if (show_mem_node_skip(filter, pgdat->node_id, nodemask)) |
c02e50bb MH |
5541 | continue; |
5542 | ||
599d0c95 MG |
5543 | printk("Node %d" |
5544 | " active_anon:%lukB" | |
5545 | " inactive_anon:%lukB" | |
5546 | " active_file:%lukB" | |
5547 | " inactive_file:%lukB" | |
5548 | " unevictable:%lukB" | |
5549 | " isolated(anon):%lukB" | |
5550 | " isolated(file):%lukB" | |
50658e2e | 5551 | " mapped:%lukB" |
11fb9989 MG |
5552 | " dirty:%lukB" |
5553 | " writeback:%lukB" | |
5554 | " shmem:%lukB" | |
5555 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
5556 | " shmem_thp: %lukB" | |
5557 | " shmem_pmdmapped: %lukB" | |
5558 | " anon_thp: %lukB" | |
5559 | #endif | |
5560 | " writeback_tmp:%lukB" | |
991e7673 SB |
5561 | " kernel_stack:%lukB" |
5562 | #ifdef CONFIG_SHADOW_CALL_STACK | |
5563 | " shadow_call_stack:%lukB" | |
5564 | #endif | |
f0c0c115 | 5565 | " pagetables:%lukB" |
599d0c95 MG |
5566 | " all_unreclaimable? %s" |
5567 | "\n", | |
5568 | pgdat->node_id, | |
5569 | K(node_page_state(pgdat, NR_ACTIVE_ANON)), | |
5570 | K(node_page_state(pgdat, NR_INACTIVE_ANON)), | |
5571 | K(node_page_state(pgdat, NR_ACTIVE_FILE)), | |
5572 | K(node_page_state(pgdat, NR_INACTIVE_FILE)), | |
5573 | K(node_page_state(pgdat, NR_UNEVICTABLE)), | |
5574 | K(node_page_state(pgdat, NR_ISOLATED_ANON)), | |
5575 | K(node_page_state(pgdat, NR_ISOLATED_FILE)), | |
50658e2e | 5576 | K(node_page_state(pgdat, NR_FILE_MAPPED)), |
11fb9989 MG |
5577 | K(node_page_state(pgdat, NR_FILE_DIRTY)), |
5578 | K(node_page_state(pgdat, NR_WRITEBACK)), | |
1f06b81a | 5579 | K(node_page_state(pgdat, NR_SHMEM)), |
11fb9989 MG |
5580 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
5581 | K(node_page_state(pgdat, NR_SHMEM_THPS) * HPAGE_PMD_NR), | |
5582 | K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) | |
5583 | * HPAGE_PMD_NR), | |
5584 | K(node_page_state(pgdat, NR_ANON_THPS) * HPAGE_PMD_NR), | |
5585 | #endif | |
11fb9989 | 5586 | K(node_page_state(pgdat, NR_WRITEBACK_TEMP)), |
991e7673 SB |
5587 | node_page_state(pgdat, NR_KERNEL_STACK_KB), |
5588 | #ifdef CONFIG_SHADOW_CALL_STACK | |
5589 | node_page_state(pgdat, NR_KERNEL_SCS_KB), | |
5590 | #endif | |
f0c0c115 | 5591 | K(node_page_state(pgdat, NR_PAGETABLE)), |
c73322d0 JW |
5592 | pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES ? |
5593 | "yes" : "no"); | |
599d0c95 MG |
5594 | } |
5595 | ||
ee99c71c | 5596 | for_each_populated_zone(zone) { |
1da177e4 LT |
5597 | int i; |
5598 | ||
9af744d7 | 5599 | if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask)) |
ddd588b5 | 5600 | continue; |
d1bfcdb8 KK |
5601 | |
5602 | free_pcp = 0; | |
5603 | for_each_online_cpu(cpu) | |
5604 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; | |
5605 | ||
1da177e4 | 5606 | show_node(zone); |
1f84a18f JP |
5607 | printk(KERN_CONT |
5608 | "%s" | |
1da177e4 LT |
5609 | " free:%lukB" |
5610 | " min:%lukB" | |
5611 | " low:%lukB" | |
5612 | " high:%lukB" | |
e47b346a | 5613 | " reserved_highatomic:%luKB" |
71c799f4 MK |
5614 | " active_anon:%lukB" |
5615 | " inactive_anon:%lukB" | |
5616 | " active_file:%lukB" | |
5617 | " inactive_file:%lukB" | |
5618 | " unevictable:%lukB" | |
5a1c84b4 | 5619 | " writepending:%lukB" |
1da177e4 | 5620 | " present:%lukB" |
9feedc9d | 5621 | " managed:%lukB" |
4a0aa73f | 5622 | " mlocked:%lukB" |
4a0aa73f | 5623 | " bounce:%lukB" |
d1bfcdb8 KK |
5624 | " free_pcp:%lukB" |
5625 | " local_pcp:%ukB" | |
d1ce749a | 5626 | " free_cma:%lukB" |
1da177e4 LT |
5627 | "\n", |
5628 | zone->name, | |
88f5acf8 | 5629 | K(zone_page_state(zone, NR_FREE_PAGES)), |
41858966 MG |
5630 | K(min_wmark_pages(zone)), |
5631 | K(low_wmark_pages(zone)), | |
5632 | K(high_wmark_pages(zone)), | |
e47b346a | 5633 | K(zone->nr_reserved_highatomic), |
71c799f4 MK |
5634 | K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON)), |
5635 | K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON)), | |
5636 | K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE)), | |
5637 | K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE)), | |
5638 | K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)), | |
5a1c84b4 | 5639 | K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)), |
1da177e4 | 5640 | K(zone->present_pages), |
9705bea5 | 5641 | K(zone_managed_pages(zone)), |
4a0aa73f | 5642 | K(zone_page_state(zone, NR_MLOCK)), |
4a0aa73f | 5643 | K(zone_page_state(zone, NR_BOUNCE)), |
d1bfcdb8 KK |
5644 | K(free_pcp), |
5645 | K(this_cpu_read(zone->pageset->pcp.count)), | |
33e077bd | 5646 | K(zone_page_state(zone, NR_FREE_CMA_PAGES))); |
1da177e4 LT |
5647 | printk("lowmem_reserve[]:"); |
5648 | for (i = 0; i < MAX_NR_ZONES; i++) | |
1f84a18f JP |
5649 | printk(KERN_CONT " %ld", zone->lowmem_reserve[i]); |
5650 | printk(KERN_CONT "\n"); | |
1da177e4 LT |
5651 | } |
5652 | ||
ee99c71c | 5653 | for_each_populated_zone(zone) { |
d00181b9 KS |
5654 | unsigned int order; |
5655 | unsigned long nr[MAX_ORDER], flags, total = 0; | |
377e4f16 | 5656 | unsigned char types[MAX_ORDER]; |
1da177e4 | 5657 | |
9af744d7 | 5658 | if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask)) |
ddd588b5 | 5659 | continue; |
1da177e4 | 5660 | show_node(zone); |
1f84a18f | 5661 | printk(KERN_CONT "%s: ", zone->name); |
1da177e4 LT |
5662 | |
5663 | spin_lock_irqsave(&zone->lock, flags); | |
5664 | for (order = 0; order < MAX_ORDER; order++) { | |
377e4f16 RV |
5665 | struct free_area *area = &zone->free_area[order]; |
5666 | int type; | |
5667 | ||
5668 | nr[order] = area->nr_free; | |
8f9de51a | 5669 | total += nr[order] << order; |
377e4f16 RV |
5670 | |
5671 | types[order] = 0; | |
5672 | for (type = 0; type < MIGRATE_TYPES; type++) { | |
b03641af | 5673 | if (!free_area_empty(area, type)) |
377e4f16 RV |
5674 | types[order] |= 1 << type; |
5675 | } | |
1da177e4 LT |
5676 | } |
5677 | spin_unlock_irqrestore(&zone->lock, flags); | |
377e4f16 | 5678 | for (order = 0; order < MAX_ORDER; order++) { |
1f84a18f JP |
5679 | printk(KERN_CONT "%lu*%lukB ", |
5680 | nr[order], K(1UL) << order); | |
377e4f16 RV |
5681 | if (nr[order]) |
5682 | show_migration_types(types[order]); | |
5683 | } | |
1f84a18f | 5684 | printk(KERN_CONT "= %lukB\n", K(total)); |
1da177e4 LT |
5685 | } |
5686 | ||
949f7ec5 DR |
5687 | hugetlb_show_meminfo(); |
5688 | ||
11fb9989 | 5689 | printk("%ld total pagecache pages\n", global_node_page_state(NR_FILE_PAGES)); |
e6f3602d | 5690 | |
1da177e4 LT |
5691 | show_swap_cache_info(); |
5692 | } | |
5693 | ||
19770b32 MG |
5694 | static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) |
5695 | { | |
5696 | zoneref->zone = zone; | |
5697 | zoneref->zone_idx = zone_idx(zone); | |
5698 | } | |
5699 | ||
1da177e4 LT |
5700 | /* |
5701 | * Builds allocation fallback zone lists. | |
1a93205b CL |
5702 | * |
5703 | * Add all populated zones of a node to the zonelist. | |
1da177e4 | 5704 | */ |
9d3be21b | 5705 | static int build_zonerefs_node(pg_data_t *pgdat, struct zoneref *zonerefs) |
1da177e4 | 5706 | { |
1a93205b | 5707 | struct zone *zone; |
bc732f1d | 5708 | enum zone_type zone_type = MAX_NR_ZONES; |
9d3be21b | 5709 | int nr_zones = 0; |
02a68a5e CL |
5710 | |
5711 | do { | |
2f6726e5 | 5712 | zone_type--; |
070f8032 | 5713 | zone = pgdat->node_zones + zone_type; |
6aa303de | 5714 | if (managed_zone(zone)) { |
9d3be21b | 5715 | zoneref_set_zone(zone, &zonerefs[nr_zones++]); |
070f8032 | 5716 | check_highest_zone(zone_type); |
1da177e4 | 5717 | } |
2f6726e5 | 5718 | } while (zone_type); |
bc732f1d | 5719 | |
070f8032 | 5720 | return nr_zones; |
1da177e4 LT |
5721 | } |
5722 | ||
5723 | #ifdef CONFIG_NUMA | |
f0c0b2b8 KH |
5724 | |
5725 | static int __parse_numa_zonelist_order(char *s) | |
5726 | { | |
c9bff3ee MH |
5727 | /* |
5728 | * We used to support different zonlists modes but they turned | |
5729 | * out to be just not useful. Let's keep the warning in place | |
5730 | * if somebody still use the cmd line parameter so that we do | |
5731 | * not fail it silently | |
5732 | */ | |
5733 | if (!(*s == 'd' || *s == 'D' || *s == 'n' || *s == 'N')) { | |
5734 | pr_warn("Ignoring unsupported numa_zonelist_order value: %s\n", s); | |
f0c0b2b8 KH |
5735 | return -EINVAL; |
5736 | } | |
5737 | return 0; | |
5738 | } | |
5739 | ||
c9bff3ee MH |
5740 | char numa_zonelist_order[] = "Node"; |
5741 | ||
f0c0b2b8 KH |
5742 | /* |
5743 | * sysctl handler for numa_zonelist_order | |
5744 | */ | |
cccad5b9 | 5745 | int numa_zonelist_order_handler(struct ctl_table *table, int write, |
32927393 | 5746 | void *buffer, size_t *length, loff_t *ppos) |
f0c0b2b8 | 5747 | { |
32927393 CH |
5748 | if (write) |
5749 | return __parse_numa_zonelist_order(buffer); | |
5750 | return proc_dostring(table, write, buffer, length, ppos); | |
f0c0b2b8 KH |
5751 | } |
5752 | ||
5753 | ||
62bc62a8 | 5754 | #define MAX_NODE_LOAD (nr_online_nodes) |
f0c0b2b8 KH |
5755 | static int node_load[MAX_NUMNODES]; |
5756 | ||
1da177e4 | 5757 | /** |
4dc3b16b | 5758 | * find_next_best_node - find the next node that should appear in a given node's fallback list |
1da177e4 LT |
5759 | * @node: node whose fallback list we're appending |
5760 | * @used_node_mask: nodemask_t of already used nodes | |
5761 | * | |
5762 | * We use a number of factors to determine which is the next node that should | |
5763 | * appear on a given node's fallback list. The node should not have appeared | |
5764 | * already in @node's fallback list, and it should be the next closest node | |
5765 | * according to the distance array (which contains arbitrary distance values | |
5766 | * from each node to each node in the system), and should also prefer nodes | |
5767 | * with no CPUs, since presumably they'll have very little allocation pressure | |
5768 | * on them otherwise. | |
a862f68a MR |
5769 | * |
5770 | * Return: node id of the found node or %NUMA_NO_NODE if no node is found. | |
1da177e4 | 5771 | */ |
f0c0b2b8 | 5772 | static int find_next_best_node(int node, nodemask_t *used_node_mask) |
1da177e4 | 5773 | { |
4cf808eb | 5774 | int n, val; |
1da177e4 | 5775 | int min_val = INT_MAX; |
00ef2d2f | 5776 | int best_node = NUMA_NO_NODE; |
1da177e4 | 5777 | |
4cf808eb LT |
5778 | /* Use the local node if we haven't already */ |
5779 | if (!node_isset(node, *used_node_mask)) { | |
5780 | node_set(node, *used_node_mask); | |
5781 | return node; | |
5782 | } | |
1da177e4 | 5783 | |
4b0ef1fe | 5784 | for_each_node_state(n, N_MEMORY) { |
1da177e4 LT |
5785 | |
5786 | /* Don't want a node to appear more than once */ | |
5787 | if (node_isset(n, *used_node_mask)) | |
5788 | continue; | |
5789 | ||
1da177e4 LT |
5790 | /* Use the distance array to find the distance */ |
5791 | val = node_distance(node, n); | |
5792 | ||
4cf808eb LT |
5793 | /* Penalize nodes under us ("prefer the next node") */ |
5794 | val += (n < node); | |
5795 | ||
1da177e4 | 5796 | /* Give preference to headless and unused nodes */ |
b630749f | 5797 | if (!cpumask_empty(cpumask_of_node(n))) |
1da177e4 LT |
5798 | val += PENALTY_FOR_NODE_WITH_CPUS; |
5799 | ||
5800 | /* Slight preference for less loaded node */ | |
5801 | val *= (MAX_NODE_LOAD*MAX_NUMNODES); | |
5802 | val += node_load[n]; | |
5803 | ||
5804 | if (val < min_val) { | |
5805 | min_val = val; | |
5806 | best_node = n; | |
5807 | } | |
5808 | } | |
5809 | ||
5810 | if (best_node >= 0) | |
5811 | node_set(best_node, *used_node_mask); | |
5812 | ||
5813 | return best_node; | |
5814 | } | |
5815 | ||
f0c0b2b8 KH |
5816 | |
5817 | /* | |
5818 | * Build zonelists ordered by node and zones within node. | |
5819 | * This results in maximum locality--normal zone overflows into local | |
5820 | * DMA zone, if any--but risks exhausting DMA zone. | |
5821 | */ | |
9d3be21b MH |
5822 | static void build_zonelists_in_node_order(pg_data_t *pgdat, int *node_order, |
5823 | unsigned nr_nodes) | |
1da177e4 | 5824 | { |
9d3be21b MH |
5825 | struct zoneref *zonerefs; |
5826 | int i; | |
5827 | ||
5828 | zonerefs = pgdat->node_zonelists[ZONELIST_FALLBACK]._zonerefs; | |
5829 | ||
5830 | for (i = 0; i < nr_nodes; i++) { | |
5831 | int nr_zones; | |
5832 | ||
5833 | pg_data_t *node = NODE_DATA(node_order[i]); | |
f0c0b2b8 | 5834 | |
9d3be21b MH |
5835 | nr_zones = build_zonerefs_node(node, zonerefs); |
5836 | zonerefs += nr_zones; | |
5837 | } | |
5838 | zonerefs->zone = NULL; | |
5839 | zonerefs->zone_idx = 0; | |
f0c0b2b8 KH |
5840 | } |
5841 | ||
523b9458 CL |
5842 | /* |
5843 | * Build gfp_thisnode zonelists | |
5844 | */ | |
5845 | static void build_thisnode_zonelists(pg_data_t *pgdat) | |
5846 | { | |
9d3be21b MH |
5847 | struct zoneref *zonerefs; |
5848 | int nr_zones; | |
523b9458 | 5849 | |
9d3be21b MH |
5850 | zonerefs = pgdat->node_zonelists[ZONELIST_NOFALLBACK]._zonerefs; |
5851 | nr_zones = build_zonerefs_node(pgdat, zonerefs); | |
5852 | zonerefs += nr_zones; | |
5853 | zonerefs->zone = NULL; | |
5854 | zonerefs->zone_idx = 0; | |
523b9458 CL |
5855 | } |
5856 | ||
f0c0b2b8 KH |
5857 | /* |
5858 | * Build zonelists ordered by zone and nodes within zones. | |
5859 | * This results in conserving DMA zone[s] until all Normal memory is | |
5860 | * exhausted, but results in overflowing to remote node while memory | |
5861 | * may still exist in local DMA zone. | |
5862 | */ | |
f0c0b2b8 | 5863 | |
f0c0b2b8 KH |
5864 | static void build_zonelists(pg_data_t *pgdat) |
5865 | { | |
9d3be21b MH |
5866 | static int node_order[MAX_NUMNODES]; |
5867 | int node, load, nr_nodes = 0; | |
d0ddf49b | 5868 | nodemask_t used_mask = NODE_MASK_NONE; |
f0c0b2b8 | 5869 | int local_node, prev_node; |
1da177e4 LT |
5870 | |
5871 | /* NUMA-aware ordering of nodes */ | |
5872 | local_node = pgdat->node_id; | |
62bc62a8 | 5873 | load = nr_online_nodes; |
1da177e4 | 5874 | prev_node = local_node; |
f0c0b2b8 | 5875 | |
f0c0b2b8 | 5876 | memset(node_order, 0, sizeof(node_order)); |
1da177e4 LT |
5877 | while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { |
5878 | /* | |
5879 | * We don't want to pressure a particular node. | |
5880 | * So adding penalty to the first node in same | |
5881 | * distance group to make it round-robin. | |
5882 | */ | |
957f822a DR |
5883 | if (node_distance(local_node, node) != |
5884 | node_distance(local_node, prev_node)) | |
f0c0b2b8 KH |
5885 | node_load[node] = load; |
5886 | ||
9d3be21b | 5887 | node_order[nr_nodes++] = node; |
1da177e4 LT |
5888 | prev_node = node; |
5889 | load--; | |
1da177e4 | 5890 | } |
523b9458 | 5891 | |
9d3be21b | 5892 | build_zonelists_in_node_order(pgdat, node_order, nr_nodes); |
523b9458 | 5893 | build_thisnode_zonelists(pgdat); |
1da177e4 LT |
5894 | } |
5895 | ||
7aac7898 LS |
5896 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
5897 | /* | |
5898 | * Return node id of node used for "local" allocations. | |
5899 | * I.e., first node id of first zone in arg node's generic zonelist. | |
5900 | * Used for initializing percpu 'numa_mem', which is used primarily | |
5901 | * for kernel allocations, so use GFP_KERNEL flags to locate zonelist. | |
5902 | */ | |
5903 | int local_memory_node(int node) | |
5904 | { | |
c33d6c06 | 5905 | struct zoneref *z; |
7aac7898 | 5906 | |
c33d6c06 | 5907 | z = first_zones_zonelist(node_zonelist(node, GFP_KERNEL), |
7aac7898 | 5908 | gfp_zone(GFP_KERNEL), |
c33d6c06 | 5909 | NULL); |
c1093b74 | 5910 | return zone_to_nid(z->zone); |
7aac7898 LS |
5911 | } |
5912 | #endif | |
f0c0b2b8 | 5913 | |
6423aa81 JK |
5914 | static void setup_min_unmapped_ratio(void); |
5915 | static void setup_min_slab_ratio(void); | |
1da177e4 LT |
5916 | #else /* CONFIG_NUMA */ |
5917 | ||
f0c0b2b8 | 5918 | static void build_zonelists(pg_data_t *pgdat) |
1da177e4 | 5919 | { |
19655d34 | 5920 | int node, local_node; |
9d3be21b MH |
5921 | struct zoneref *zonerefs; |
5922 | int nr_zones; | |
1da177e4 LT |
5923 | |
5924 | local_node = pgdat->node_id; | |
1da177e4 | 5925 | |
9d3be21b MH |
5926 | zonerefs = pgdat->node_zonelists[ZONELIST_FALLBACK]._zonerefs; |
5927 | nr_zones = build_zonerefs_node(pgdat, zonerefs); | |
5928 | zonerefs += nr_zones; | |
1da177e4 | 5929 | |
54a6eb5c MG |
5930 | /* |
5931 | * Now we build the zonelist so that it contains the zones | |
5932 | * of all the other nodes. | |
5933 | * We don't want to pressure a particular node, so when | |
5934 | * building the zones for node N, we make sure that the | |
5935 | * zones coming right after the local ones are those from | |
5936 | * node N+1 (modulo N) | |
5937 | */ | |
5938 | for (node = local_node + 1; node < MAX_NUMNODES; node++) { | |
5939 | if (!node_online(node)) | |
5940 | continue; | |
9d3be21b MH |
5941 | nr_zones = build_zonerefs_node(NODE_DATA(node), zonerefs); |
5942 | zonerefs += nr_zones; | |
1da177e4 | 5943 | } |
54a6eb5c MG |
5944 | for (node = 0; node < local_node; node++) { |
5945 | if (!node_online(node)) | |
5946 | continue; | |
9d3be21b MH |
5947 | nr_zones = build_zonerefs_node(NODE_DATA(node), zonerefs); |
5948 | zonerefs += nr_zones; | |
54a6eb5c MG |
5949 | } |
5950 | ||
9d3be21b MH |
5951 | zonerefs->zone = NULL; |
5952 | zonerefs->zone_idx = 0; | |
1da177e4 LT |
5953 | } |
5954 | ||
5955 | #endif /* CONFIG_NUMA */ | |
5956 | ||
99dcc3e5 CL |
5957 | /* |
5958 | * Boot pageset table. One per cpu which is going to be used for all | |
5959 | * zones and all nodes. The parameters will be set in such a way | |
5960 | * that an item put on a list will immediately be handed over to | |
5961 | * the buddy list. This is safe since pageset manipulation is done | |
5962 | * with interrupts disabled. | |
5963 | * | |
5964 | * The boot_pagesets must be kept even after bootup is complete for | |
5965 | * unused processors and/or zones. They do play a role for bootstrapping | |
5966 | * hotplugged processors. | |
5967 | * | |
5968 | * zoneinfo_show() and maybe other functions do | |
5969 | * not check if the processor is online before following the pageset pointer. | |
5970 | * Other parts of the kernel may not check if the zone is available. | |
5971 | */ | |
69a8396a | 5972 | static void pageset_init(struct per_cpu_pageset *p); |
952eaf81 VB |
5973 | /* These effectively disable the pcplists in the boot pageset completely */ |
5974 | #define BOOT_PAGESET_HIGH 0 | |
5975 | #define BOOT_PAGESET_BATCH 1 | |
99dcc3e5 | 5976 | static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset); |
385386cf | 5977 | static DEFINE_PER_CPU(struct per_cpu_nodestat, boot_nodestats); |
99dcc3e5 | 5978 | |
11cd8638 | 5979 | static void __build_all_zonelists(void *data) |
1da177e4 | 5980 | { |
6811378e | 5981 | int nid; |
afb6ebb3 | 5982 | int __maybe_unused cpu; |
9adb62a5 | 5983 | pg_data_t *self = data; |
b93e0f32 MH |
5984 | static DEFINE_SPINLOCK(lock); |
5985 | ||
5986 | spin_lock(&lock); | |
9276b1bc | 5987 | |
7f9cfb31 BL |
5988 | #ifdef CONFIG_NUMA |
5989 | memset(node_load, 0, sizeof(node_load)); | |
5990 | #endif | |
9adb62a5 | 5991 | |
c1152583 WY |
5992 | /* |
5993 | * This node is hotadded and no memory is yet present. So just | |
5994 | * building zonelists is fine - no need to touch other nodes. | |
5995 | */ | |
9adb62a5 JL |
5996 | if (self && !node_online(self->node_id)) { |
5997 | build_zonelists(self); | |
c1152583 WY |
5998 | } else { |
5999 | for_each_online_node(nid) { | |
6000 | pg_data_t *pgdat = NODE_DATA(nid); | |
7ea1530a | 6001 | |
c1152583 WY |
6002 | build_zonelists(pgdat); |
6003 | } | |
99dcc3e5 | 6004 | |
7aac7898 LS |
6005 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
6006 | /* | |
6007 | * We now know the "local memory node" for each node-- | |
6008 | * i.e., the node of the first zone in the generic zonelist. | |
6009 | * Set up numa_mem percpu variable for on-line cpus. During | |
6010 | * boot, only the boot cpu should be on-line; we'll init the | |
6011 | * secondary cpus' numa_mem as they come on-line. During | |
6012 | * node/memory hotplug, we'll fixup all on-line cpus. | |
6013 | */ | |
d9c9a0b9 | 6014 | for_each_online_cpu(cpu) |
7aac7898 | 6015 | set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu))); |
afb6ebb3 | 6016 | #endif |
d9c9a0b9 | 6017 | } |
b93e0f32 MH |
6018 | |
6019 | spin_unlock(&lock); | |
6811378e YG |
6020 | } |
6021 | ||
061f67bc RV |
6022 | static noinline void __init |
6023 | build_all_zonelists_init(void) | |
6024 | { | |
afb6ebb3 MH |
6025 | int cpu; |
6026 | ||
061f67bc | 6027 | __build_all_zonelists(NULL); |
afb6ebb3 MH |
6028 | |
6029 | /* | |
6030 | * Initialize the boot_pagesets that are going to be used | |
6031 | * for bootstrapping processors. The real pagesets for | |
6032 | * each zone will be allocated later when the per cpu | |
6033 | * allocator is available. | |
6034 | * | |
6035 | * boot_pagesets are used also for bootstrapping offline | |
6036 | * cpus if the system is already booted because the pagesets | |
6037 | * are needed to initialize allocators on a specific cpu too. | |
6038 | * F.e. the percpu allocator needs the page allocator which | |
6039 | * needs the percpu allocator in order to allocate its pagesets | |
6040 | * (a chicken-egg dilemma). | |
6041 | */ | |
6042 | for_each_possible_cpu(cpu) | |
69a8396a | 6043 | pageset_init(&per_cpu(boot_pageset, cpu)); |
afb6ebb3 | 6044 | |
061f67bc RV |
6045 | mminit_verify_zonelist(); |
6046 | cpuset_init_current_mems_allowed(); | |
6047 | } | |
6048 | ||
4eaf3f64 | 6049 | /* |
4eaf3f64 | 6050 | * unless system_state == SYSTEM_BOOTING. |
061f67bc | 6051 | * |
72675e13 | 6052 | * __ref due to call of __init annotated helper build_all_zonelists_init |
061f67bc | 6053 | * [protected by SYSTEM_BOOTING]. |
4eaf3f64 | 6054 | */ |
72675e13 | 6055 | void __ref build_all_zonelists(pg_data_t *pgdat) |
6811378e | 6056 | { |
0a18e607 DH |
6057 | unsigned long vm_total_pages; |
6058 | ||
6811378e | 6059 | if (system_state == SYSTEM_BOOTING) { |
061f67bc | 6060 | build_all_zonelists_init(); |
6811378e | 6061 | } else { |
11cd8638 | 6062 | __build_all_zonelists(pgdat); |
6811378e YG |
6063 | /* cpuset refresh routine should be here */ |
6064 | } | |
56b9413b DH |
6065 | /* Get the number of free pages beyond high watermark in all zones. */ |
6066 | vm_total_pages = nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); | |
9ef9acb0 MG |
6067 | /* |
6068 | * Disable grouping by mobility if the number of pages in the | |
6069 | * system is too low to allow the mechanism to work. It would be | |
6070 | * more accurate, but expensive to check per-zone. This check is | |
6071 | * made on memory-hotadd so a system can start with mobility | |
6072 | * disabled and enable it later | |
6073 | */ | |
d9c23400 | 6074 | if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES)) |
9ef9acb0 MG |
6075 | page_group_by_mobility_disabled = 1; |
6076 | else | |
6077 | page_group_by_mobility_disabled = 0; | |
6078 | ||
ce0725f7 | 6079 | pr_info("Built %u zonelists, mobility grouping %s. Total pages: %ld\n", |
756a025f | 6080 | nr_online_nodes, |
756a025f JP |
6081 | page_group_by_mobility_disabled ? "off" : "on", |
6082 | vm_total_pages); | |
f0c0b2b8 | 6083 | #ifdef CONFIG_NUMA |
f88dfff5 | 6084 | pr_info("Policy zone: %s\n", zone_names[policy_zone]); |
f0c0b2b8 | 6085 | #endif |
1da177e4 LT |
6086 | } |
6087 | ||
a9a9e77f PT |
6088 | /* If zone is ZONE_MOVABLE but memory is mirrored, it is an overlapped init */ |
6089 | static bool __meminit | |
6090 | overlap_memmap_init(unsigned long zone, unsigned long *pfn) | |
6091 | { | |
a9a9e77f PT |
6092 | static struct memblock_region *r; |
6093 | ||
6094 | if (mirrored_kernelcore && zone == ZONE_MOVABLE) { | |
6095 | if (!r || *pfn >= memblock_region_memory_end_pfn(r)) { | |
cc6de168 | 6096 | for_each_mem_region(r) { |
a9a9e77f PT |
6097 | if (*pfn < memblock_region_memory_end_pfn(r)) |
6098 | break; | |
6099 | } | |
6100 | } | |
6101 | if (*pfn >= memblock_region_memory_base_pfn(r) && | |
6102 | memblock_is_mirror(r)) { | |
6103 | *pfn = memblock_region_memory_end_pfn(r); | |
6104 | return true; | |
6105 | } | |
6106 | } | |
a9a9e77f PT |
6107 | return false; |
6108 | } | |
6109 | ||
1da177e4 LT |
6110 | /* |
6111 | * Initially all pages are reserved - free ones are freed | |
c6ffc5ca | 6112 | * up by memblock_free_all() once the early boot process is |
1da177e4 | 6113 | * done. Non-atomic initialization, single-pass. |
d882c006 DH |
6114 | * |
6115 | * All aligned pageblocks are initialized to the specified migratetype | |
6116 | * (usually MIGRATE_MOVABLE). Besides setting the migratetype, no related | |
6117 | * zone stats (e.g., nr_isolate_pageblock) are touched. | |
1da177e4 | 6118 | */ |
c09b4240 | 6119 | void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, |
dc2da7b4 | 6120 | unsigned long start_pfn, unsigned long zone_end_pfn, |
d882c006 DH |
6121 | enum meminit_context context, |
6122 | struct vmem_altmap *altmap, int migratetype) | |
1da177e4 | 6123 | { |
a9a9e77f | 6124 | unsigned long pfn, end_pfn = start_pfn + size; |
d0dc12e8 | 6125 | struct page *page; |
1da177e4 | 6126 | |
22b31eec HD |
6127 | if (highest_memmap_pfn < end_pfn - 1) |
6128 | highest_memmap_pfn = end_pfn - 1; | |
6129 | ||
966cf44f | 6130 | #ifdef CONFIG_ZONE_DEVICE |
4b94ffdc DW |
6131 | /* |
6132 | * Honor reservation requested by the driver for this ZONE_DEVICE | |
966cf44f AD |
6133 | * memory. We limit the total number of pages to initialize to just |
6134 | * those that might contain the memory mapping. We will defer the | |
6135 | * ZONE_DEVICE page initialization until after we have released | |
6136 | * the hotplug lock. | |
4b94ffdc | 6137 | */ |
966cf44f AD |
6138 | if (zone == ZONE_DEVICE) { |
6139 | if (!altmap) | |
6140 | return; | |
6141 | ||
6142 | if (start_pfn == altmap->base_pfn) | |
6143 | start_pfn += altmap->reserve; | |
6144 | end_pfn = altmap->base_pfn + vmem_altmap_offset(altmap); | |
6145 | } | |
6146 | #endif | |
4b94ffdc | 6147 | |
948c436e | 6148 | for (pfn = start_pfn; pfn < end_pfn; ) { |
a2f3aa02 | 6149 | /* |
b72d0ffb AM |
6150 | * There can be holes in boot-time mem_map[]s handed to this |
6151 | * function. They do not exist on hotplugged memory. | |
a2f3aa02 | 6152 | */ |
c1d0da83 | 6153 | if (context == MEMINIT_EARLY) { |
a9a9e77f PT |
6154 | if (overlap_memmap_init(zone, &pfn)) |
6155 | continue; | |
dc2da7b4 | 6156 | if (defer_init(nid, pfn, zone_end_pfn)) |
a9a9e77f | 6157 | break; |
a2f3aa02 | 6158 | } |
ac5d2539 | 6159 | |
d0dc12e8 PT |
6160 | page = pfn_to_page(pfn); |
6161 | __init_single_page(page, pfn, zone, nid); | |
c1d0da83 | 6162 | if (context == MEMINIT_HOTPLUG) |
d483da5b | 6163 | __SetPageReserved(page); |
d0dc12e8 | 6164 | |
ac5d2539 | 6165 | /* |
d882c006 DH |
6166 | * Usually, we want to mark the pageblock MIGRATE_MOVABLE, |
6167 | * such that unmovable allocations won't be scattered all | |
6168 | * over the place during system boot. | |
ac5d2539 | 6169 | */ |
4eb29bd9 | 6170 | if (IS_ALIGNED(pfn, pageblock_nr_pages)) { |
d882c006 | 6171 | set_pageblock_migratetype(page, migratetype); |
9b6e63cb | 6172 | cond_resched(); |
ac5d2539 | 6173 | } |
948c436e | 6174 | pfn++; |
1da177e4 LT |
6175 | } |
6176 | } | |
6177 | ||
966cf44f AD |
6178 | #ifdef CONFIG_ZONE_DEVICE |
6179 | void __ref memmap_init_zone_device(struct zone *zone, | |
6180 | unsigned long start_pfn, | |
1f8d75c1 | 6181 | unsigned long nr_pages, |
966cf44f AD |
6182 | struct dev_pagemap *pgmap) |
6183 | { | |
1f8d75c1 | 6184 | unsigned long pfn, end_pfn = start_pfn + nr_pages; |
966cf44f | 6185 | struct pglist_data *pgdat = zone->zone_pgdat; |
514caf23 | 6186 | struct vmem_altmap *altmap = pgmap_altmap(pgmap); |
966cf44f AD |
6187 | unsigned long zone_idx = zone_idx(zone); |
6188 | unsigned long start = jiffies; | |
6189 | int nid = pgdat->node_id; | |
6190 | ||
46d945ae | 6191 | if (WARN_ON_ONCE(!pgmap || zone_idx(zone) != ZONE_DEVICE)) |
966cf44f AD |
6192 | return; |
6193 | ||
6194 | /* | |
6195 | * The call to memmap_init_zone should have already taken care | |
6196 | * of the pages reserved for the memmap, so we can just jump to | |
6197 | * the end of that region and start processing the device pages. | |
6198 | */ | |
514caf23 | 6199 | if (altmap) { |
966cf44f | 6200 | start_pfn = altmap->base_pfn + vmem_altmap_offset(altmap); |
1f8d75c1 | 6201 | nr_pages = end_pfn - start_pfn; |
966cf44f AD |
6202 | } |
6203 | ||
6204 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { | |
6205 | struct page *page = pfn_to_page(pfn); | |
6206 | ||
6207 | __init_single_page(page, pfn, zone_idx, nid); | |
6208 | ||
6209 | /* | |
6210 | * Mark page reserved as it will need to wait for onlining | |
6211 | * phase for it to be fully associated with a zone. | |
6212 | * | |
6213 | * We can use the non-atomic __set_bit operation for setting | |
6214 | * the flag as we are still initializing the pages. | |
6215 | */ | |
6216 | __SetPageReserved(page); | |
6217 | ||
6218 | /* | |
8a164fef CH |
6219 | * ZONE_DEVICE pages union ->lru with a ->pgmap back pointer |
6220 | * and zone_device_data. It is a bug if a ZONE_DEVICE page is | |
6221 | * ever freed or placed on a driver-private list. | |
966cf44f AD |
6222 | */ |
6223 | page->pgmap = pgmap; | |
8a164fef | 6224 | page->zone_device_data = NULL; |
966cf44f AD |
6225 | |
6226 | /* | |
6227 | * Mark the block movable so that blocks are reserved for | |
6228 | * movable at startup. This will force kernel allocations | |
6229 | * to reserve their blocks rather than leaking throughout | |
6230 | * the address space during boot when many long-lived | |
6231 | * kernel allocations are made. | |
6232 | * | |
c1d0da83 | 6233 | * Please note that MEMINIT_HOTPLUG path doesn't clear memmap |
ba72b4c8 | 6234 | * because this is done early in section_activate() |
966cf44f | 6235 | */ |
4eb29bd9 | 6236 | if (IS_ALIGNED(pfn, pageblock_nr_pages)) { |
966cf44f AD |
6237 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
6238 | cond_resched(); | |
6239 | } | |
6240 | } | |
6241 | ||
fdc029b1 | 6242 | pr_info("%s initialised %lu pages in %ums\n", __func__, |
1f8d75c1 | 6243 | nr_pages, jiffies_to_msecs(jiffies - start)); |
966cf44f AD |
6244 | } |
6245 | ||
6246 | #endif | |
1e548deb | 6247 | static void __meminit zone_init_free_lists(struct zone *zone) |
1da177e4 | 6248 | { |
7aeb09f9 | 6249 | unsigned int order, t; |
b2a0ac88 MG |
6250 | for_each_migratetype_order(order, t) { |
6251 | INIT_LIST_HEAD(&zone->free_area[order].free_list[t]); | |
1da177e4 LT |
6252 | zone->free_area[order].nr_free = 0; |
6253 | } | |
6254 | } | |
6255 | ||
2f2818d2 MR |
6256 | #if !defined(CONFIG_FLAT_NODE_MEM_MAP) |
6257 | /* | |
6258 | * Only struct pages that correspond to ranges defined by memblock.memory | |
6259 | * are zeroed and initialized by going through __init_single_page() during | |
6260 | * memmap_init_zone(). | |
6261 | * | |
6262 | * But, there could be struct pages that correspond to holes in | |
6263 | * memblock.memory. This can happen because of the following reasons: | |
6264 | * - physical memory bank size is not necessarily the exact multiple of the | |
6265 | * arbitrary section size | |
6266 | * - early reserved memory may not be listed in memblock.memory | |
6267 | * - memory layouts defined with memmap= kernel parameter may not align | |
6268 | * nicely with memmap sections | |
6269 | * | |
6270 | * Explicitly initialize those struct pages so that: | |
6271 | * - PG_Reserved is set | |
6272 | * - zone and node links point to zone and node that span the page if the | |
6273 | * hole is in the middle of a zone | |
6274 | * - zone and node links point to adjacent zone/node if the hole falls on | |
6275 | * the zone boundary; the pages in such holes will be prepended to the | |
6276 | * zone/node above the hole except for the trailing pages in the last | |
6277 | * section that will be appended to the zone/node below. | |
6278 | */ | |
6279 | static u64 __meminit init_unavailable_range(unsigned long spfn, | |
6280 | unsigned long epfn, | |
6281 | int zone, int node) | |
6282 | { | |
6283 | unsigned long pfn; | |
6284 | u64 pgcnt = 0; | |
6285 | ||
6286 | for (pfn = spfn; pfn < epfn; pfn++) { | |
6287 | if (!pfn_valid(ALIGN_DOWN(pfn, pageblock_nr_pages))) { | |
6288 | pfn = ALIGN_DOWN(pfn, pageblock_nr_pages) | |
6289 | + pageblock_nr_pages - 1; | |
6290 | continue; | |
6291 | } | |
6292 | __init_single_page(pfn_to_page(pfn), pfn, zone, node); | |
6293 | __SetPageReserved(pfn_to_page(pfn)); | |
6294 | pgcnt++; | |
6295 | } | |
6296 | ||
6297 | return pgcnt; | |
6298 | } | |
6299 | #else | |
6300 | static inline u64 init_unavailable_range(unsigned long spfn, unsigned long epfn, | |
6301 | int zone, int node) | |
6302 | { | |
6303 | return 0; | |
6304 | } | |
6305 | #endif | |
6306 | ||
dfb3ccd0 | 6307 | void __meminit __weak memmap_init(unsigned long size, int nid, |
73a6e474 BH |
6308 | unsigned long zone, |
6309 | unsigned long range_start_pfn) | |
dfb3ccd0 | 6310 | { |
2f2818d2 | 6311 | static unsigned long hole_pfn; |
73a6e474 BH |
6312 | unsigned long start_pfn, end_pfn; |
6313 | unsigned long range_end_pfn = range_start_pfn + size; | |
6314 | int i; | |
2f2818d2 | 6315 | u64 pgcnt = 0; |
73a6e474 BH |
6316 | |
6317 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { | |
6318 | start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn); | |
6319 | end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn); | |
6320 | ||
6321 | if (end_pfn > start_pfn) { | |
6322 | size = end_pfn - start_pfn; | |
dc2da7b4 | 6323 | memmap_init_zone(size, nid, zone, start_pfn, range_end_pfn, |
d882c006 | 6324 | MEMINIT_EARLY, NULL, MIGRATE_MOVABLE); |
73a6e474 | 6325 | } |
2f2818d2 MR |
6326 | |
6327 | if (hole_pfn < start_pfn) | |
6328 | pgcnt += init_unavailable_range(hole_pfn, start_pfn, | |
6329 | zone, nid); | |
6330 | hole_pfn = end_pfn; | |
73a6e474 | 6331 | } |
2f2818d2 MR |
6332 | |
6333 | #ifdef CONFIG_SPARSEMEM | |
6334 | /* | |
6335 | * Initialize the hole in the range [zone_end_pfn, section_end]. | |
6336 | * If zone boundary falls in the middle of a section, this hole | |
6337 | * will be re-initialized during the call to this function for the | |
6338 | * higher zone. | |
6339 | */ | |
6340 | end_pfn = round_up(range_end_pfn, PAGES_PER_SECTION); | |
6341 | if (hole_pfn < end_pfn) | |
6342 | pgcnt += init_unavailable_range(hole_pfn, end_pfn, | |
6343 | zone, nid); | |
6344 | #endif | |
6345 | ||
6346 | if (pgcnt) | |
6347 | pr_info(" %s zone: %llu pages in unavailable ranges\n", | |
6348 | zone_names[zone], pgcnt); | |
dfb3ccd0 | 6349 | } |
1da177e4 | 6350 | |
7cd2b0a3 | 6351 | static int zone_batchsize(struct zone *zone) |
e7c8d5c9 | 6352 | { |
3a6be87f | 6353 | #ifdef CONFIG_MMU |
e7c8d5c9 CL |
6354 | int batch; |
6355 | ||
6356 | /* | |
6357 | * The per-cpu-pages pools are set to around 1000th of the | |
d8a759b5 | 6358 | * size of the zone. |
e7c8d5c9 | 6359 | */ |
9705bea5 | 6360 | batch = zone_managed_pages(zone) / 1024; |
d8a759b5 AL |
6361 | /* But no more than a meg. */ |
6362 | if (batch * PAGE_SIZE > 1024 * 1024) | |
6363 | batch = (1024 * 1024) / PAGE_SIZE; | |
e7c8d5c9 CL |
6364 | batch /= 4; /* We effectively *= 4 below */ |
6365 | if (batch < 1) | |
6366 | batch = 1; | |
6367 | ||
6368 | /* | |
0ceaacc9 NP |
6369 | * Clamp the batch to a 2^n - 1 value. Having a power |
6370 | * of 2 value was found to be more likely to have | |
6371 | * suboptimal cache aliasing properties in some cases. | |
e7c8d5c9 | 6372 | * |
0ceaacc9 NP |
6373 | * For example if 2 tasks are alternately allocating |
6374 | * batches of pages, one task can end up with a lot | |
6375 | * of pages of one half of the possible page colors | |
6376 | * and the other with pages of the other colors. | |
e7c8d5c9 | 6377 | */ |
9155203a | 6378 | batch = rounddown_pow_of_two(batch + batch/2) - 1; |
ba56e91c | 6379 | |
e7c8d5c9 | 6380 | return batch; |
3a6be87f DH |
6381 | |
6382 | #else | |
6383 | /* The deferral and batching of frees should be suppressed under NOMMU | |
6384 | * conditions. | |
6385 | * | |
6386 | * The problem is that NOMMU needs to be able to allocate large chunks | |
6387 | * of contiguous memory as there's no hardware page translation to | |
6388 | * assemble apparent contiguous memory from discontiguous pages. | |
6389 | * | |
6390 | * Queueing large contiguous runs of pages for batching, however, | |
6391 | * causes the pages to actually be freed in smaller chunks. As there | |
6392 | * can be a significant delay between the individual batches being | |
6393 | * recycled, this leads to the once large chunks of space being | |
6394 | * fragmented and becoming unavailable for high-order allocations. | |
6395 | */ | |
6396 | return 0; | |
6397 | #endif | |
e7c8d5c9 CL |
6398 | } |
6399 | ||
8d7a8fa9 | 6400 | /* |
5c3ad2eb VB |
6401 | * pcp->high and pcp->batch values are related and generally batch is lower |
6402 | * than high. They are also related to pcp->count such that count is lower | |
6403 | * than high, and as soon as it reaches high, the pcplist is flushed. | |
8d7a8fa9 | 6404 | * |
5c3ad2eb VB |
6405 | * However, guaranteeing these relations at all times would require e.g. write |
6406 | * barriers here but also careful usage of read barriers at the read side, and | |
6407 | * thus be prone to error and bad for performance. Thus the update only prevents | |
6408 | * store tearing. Any new users of pcp->batch and pcp->high should ensure they | |
6409 | * can cope with those fields changing asynchronously, and fully trust only the | |
6410 | * pcp->count field on the local CPU with interrupts disabled. | |
8d7a8fa9 CS |
6411 | * |
6412 | * mutex_is_locked(&pcp_batch_high_lock) required when calling this function | |
6413 | * outside of boot time (or some other assurance that no concurrent updaters | |
6414 | * exist). | |
6415 | */ | |
6416 | static void pageset_update(struct per_cpu_pages *pcp, unsigned long high, | |
6417 | unsigned long batch) | |
6418 | { | |
5c3ad2eb VB |
6419 | WRITE_ONCE(pcp->batch, batch); |
6420 | WRITE_ONCE(pcp->high, high); | |
8d7a8fa9 CS |
6421 | } |
6422 | ||
88c90dbc | 6423 | static void pageset_init(struct per_cpu_pageset *p) |
2caaad41 CL |
6424 | { |
6425 | struct per_cpu_pages *pcp; | |
5f8dcc21 | 6426 | int migratetype; |
2caaad41 | 6427 | |
1c6fe946 MD |
6428 | memset(p, 0, sizeof(*p)); |
6429 | ||
3dfa5721 | 6430 | pcp = &p->pcp; |
5f8dcc21 MG |
6431 | for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++) |
6432 | INIT_LIST_HEAD(&pcp->lists[migratetype]); | |
2caaad41 | 6433 | |
69a8396a VB |
6434 | /* |
6435 | * Set batch and high values safe for a boot pageset. A true percpu | |
6436 | * pageset's initialization will update them subsequently. Here we don't | |
6437 | * need to be as careful as pageset_update() as nobody can access the | |
6438 | * pageset yet. | |
6439 | */ | |
952eaf81 VB |
6440 | pcp->high = BOOT_PAGESET_HIGH; |
6441 | pcp->batch = BOOT_PAGESET_BATCH; | |
88c90dbc CS |
6442 | } |
6443 | ||
3b1f3658 | 6444 | static void __zone_set_pageset_high_and_batch(struct zone *zone, unsigned long high, |
ec6e8c7e VB |
6445 | unsigned long batch) |
6446 | { | |
6447 | struct per_cpu_pageset *p; | |
6448 | int cpu; | |
6449 | ||
6450 | for_each_possible_cpu(cpu) { | |
6451 | p = per_cpu_ptr(zone->pageset, cpu); | |
6452 | pageset_update(&p->pcp, high, batch); | |
6453 | } | |
6454 | } | |
6455 | ||
8ad4b1fb | 6456 | /* |
0a8b4f1d | 6457 | * Calculate and set new high and batch values for all per-cpu pagesets of a |
7115ac6e | 6458 | * zone, based on the zone's size and the percpu_pagelist_fraction sysctl. |
8ad4b1fb | 6459 | */ |
0a8b4f1d | 6460 | static void zone_set_pageset_high_and_batch(struct zone *zone) |
56cef2b8 | 6461 | { |
7115ac6e VB |
6462 | unsigned long new_high, new_batch; |
6463 | ||
6464 | if (percpu_pagelist_fraction) { | |
6465 | new_high = zone_managed_pages(zone) / percpu_pagelist_fraction; | |
6466 | new_batch = max(1UL, new_high / 4); | |
6467 | if ((new_high / 4) > (PAGE_SHIFT * 8)) | |
6468 | new_batch = PAGE_SHIFT * 8; | |
6469 | } else { | |
6470 | new_batch = zone_batchsize(zone); | |
6471 | new_high = 6 * new_batch; | |
6472 | new_batch = max(1UL, 1 * new_batch); | |
6473 | } | |
169f6c19 | 6474 | |
952eaf81 VB |
6475 | if (zone->pageset_high == new_high && |
6476 | zone->pageset_batch == new_batch) | |
6477 | return; | |
6478 | ||
6479 | zone->pageset_high = new_high; | |
6480 | zone->pageset_batch = new_batch; | |
6481 | ||
ec6e8c7e | 6482 | __zone_set_pageset_high_and_batch(zone, new_high, new_batch); |
169f6c19 CS |
6483 | } |
6484 | ||
72675e13 | 6485 | void __meminit setup_zone_pageset(struct zone *zone) |
319774e2 | 6486 | { |
0a8b4f1d | 6487 | struct per_cpu_pageset *p; |
319774e2 | 6488 | int cpu; |
0a8b4f1d | 6489 | |
319774e2 | 6490 | zone->pageset = alloc_percpu(struct per_cpu_pageset); |
0a8b4f1d VB |
6491 | for_each_possible_cpu(cpu) { |
6492 | p = per_cpu_ptr(zone->pageset, cpu); | |
6493 | pageset_init(p); | |
6494 | } | |
6495 | ||
6496 | zone_set_pageset_high_and_batch(zone); | |
319774e2 WF |
6497 | } |
6498 | ||
2caaad41 | 6499 | /* |
99dcc3e5 CL |
6500 | * Allocate per cpu pagesets and initialize them. |
6501 | * Before this call only boot pagesets were available. | |
e7c8d5c9 | 6502 | */ |
99dcc3e5 | 6503 | void __init setup_per_cpu_pageset(void) |
e7c8d5c9 | 6504 | { |
b4911ea2 | 6505 | struct pglist_data *pgdat; |
99dcc3e5 | 6506 | struct zone *zone; |
b418a0f9 | 6507 | int __maybe_unused cpu; |
e7c8d5c9 | 6508 | |
319774e2 WF |
6509 | for_each_populated_zone(zone) |
6510 | setup_zone_pageset(zone); | |
b4911ea2 | 6511 | |
b418a0f9 SD |
6512 | #ifdef CONFIG_NUMA |
6513 | /* | |
6514 | * Unpopulated zones continue using the boot pagesets. | |
6515 | * The numa stats for these pagesets need to be reset. | |
6516 | * Otherwise, they will end up skewing the stats of | |
6517 | * the nodes these zones are associated with. | |
6518 | */ | |
6519 | for_each_possible_cpu(cpu) { | |
6520 | struct per_cpu_pageset *pcp = &per_cpu(boot_pageset, cpu); | |
6521 | memset(pcp->vm_numa_stat_diff, 0, | |
6522 | sizeof(pcp->vm_numa_stat_diff)); | |
6523 | } | |
6524 | #endif | |
6525 | ||
b4911ea2 MG |
6526 | for_each_online_pgdat(pgdat) |
6527 | pgdat->per_cpu_nodestats = | |
6528 | alloc_percpu(struct per_cpu_nodestat); | |
e7c8d5c9 CL |
6529 | } |
6530 | ||
c09b4240 | 6531 | static __meminit void zone_pcp_init(struct zone *zone) |
ed8ece2e | 6532 | { |
99dcc3e5 CL |
6533 | /* |
6534 | * per cpu subsystem is not up at this point. The following code | |
6535 | * relies on the ability of the linker to provide the | |
6536 | * offset of a (static) per cpu variable into the per cpu area. | |
6537 | */ | |
6538 | zone->pageset = &boot_pageset; | |
952eaf81 VB |
6539 | zone->pageset_high = BOOT_PAGESET_HIGH; |
6540 | zone->pageset_batch = BOOT_PAGESET_BATCH; | |
ed8ece2e | 6541 | |
b38a8725 | 6542 | if (populated_zone(zone)) |
99dcc3e5 CL |
6543 | printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%u\n", |
6544 | zone->name, zone->present_pages, | |
6545 | zone_batchsize(zone)); | |
ed8ece2e DH |
6546 | } |
6547 | ||
dc0bbf3b | 6548 | void __meminit init_currently_empty_zone(struct zone *zone, |
718127cc | 6549 | unsigned long zone_start_pfn, |
b171e409 | 6550 | unsigned long size) |
ed8ece2e DH |
6551 | { |
6552 | struct pglist_data *pgdat = zone->zone_pgdat; | |
8f416836 | 6553 | int zone_idx = zone_idx(zone) + 1; |
9dcb8b68 | 6554 | |
8f416836 WY |
6555 | if (zone_idx > pgdat->nr_zones) |
6556 | pgdat->nr_zones = zone_idx; | |
ed8ece2e | 6557 | |
ed8ece2e DH |
6558 | zone->zone_start_pfn = zone_start_pfn; |
6559 | ||
708614e6 MG |
6560 | mminit_dprintk(MMINIT_TRACE, "memmap_init", |
6561 | "Initialising map node %d zone %lu pfns %lu -> %lu\n", | |
6562 | pgdat->node_id, | |
6563 | (unsigned long)zone_idx(zone), | |
6564 | zone_start_pfn, (zone_start_pfn + size)); | |
6565 | ||
1e548deb | 6566 | zone_init_free_lists(zone); |
9dcb8b68 | 6567 | zone->initialized = 1; |
ed8ece2e DH |
6568 | } |
6569 | ||
c713216d MG |
6570 | /** |
6571 | * get_pfn_range_for_nid - Return the start and end page frames for a node | |
88ca3b94 RD |
6572 | * @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned. |
6573 | * @start_pfn: Passed by reference. On return, it will have the node start_pfn. | |
6574 | * @end_pfn: Passed by reference. On return, it will have the node end_pfn. | |
c713216d MG |
6575 | * |
6576 | * It returns the start and end page frame of a node based on information | |
7d018176 | 6577 | * provided by memblock_set_node(). If called for a node |
c713216d | 6578 | * with no available memory, a warning is printed and the start and end |
88ca3b94 | 6579 | * PFNs will be 0. |
c713216d | 6580 | */ |
bbe5d993 | 6581 | void __init get_pfn_range_for_nid(unsigned int nid, |
c713216d MG |
6582 | unsigned long *start_pfn, unsigned long *end_pfn) |
6583 | { | |
c13291a5 | 6584 | unsigned long this_start_pfn, this_end_pfn; |
c713216d | 6585 | int i; |
c13291a5 | 6586 | |
c713216d MG |
6587 | *start_pfn = -1UL; |
6588 | *end_pfn = 0; | |
6589 | ||
c13291a5 TH |
6590 | for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) { |
6591 | *start_pfn = min(*start_pfn, this_start_pfn); | |
6592 | *end_pfn = max(*end_pfn, this_end_pfn); | |
c713216d MG |
6593 | } |
6594 | ||
633c0666 | 6595 | if (*start_pfn == -1UL) |
c713216d | 6596 | *start_pfn = 0; |
c713216d MG |
6597 | } |
6598 | ||
2a1e274a MG |
6599 | /* |
6600 | * This finds a zone that can be used for ZONE_MOVABLE pages. The | |
6601 | * assumption is made that zones within a node are ordered in monotonic | |
6602 | * increasing memory addresses so that the "highest" populated zone is used | |
6603 | */ | |
b69a7288 | 6604 | static void __init find_usable_zone_for_movable(void) |
2a1e274a MG |
6605 | { |
6606 | int zone_index; | |
6607 | for (zone_index = MAX_NR_ZONES - 1; zone_index >= 0; zone_index--) { | |
6608 | if (zone_index == ZONE_MOVABLE) | |
6609 | continue; | |
6610 | ||
6611 | if (arch_zone_highest_possible_pfn[zone_index] > | |
6612 | arch_zone_lowest_possible_pfn[zone_index]) | |
6613 | break; | |
6614 | } | |
6615 | ||
6616 | VM_BUG_ON(zone_index == -1); | |
6617 | movable_zone = zone_index; | |
6618 | } | |
6619 | ||
6620 | /* | |
6621 | * The zone ranges provided by the architecture do not include ZONE_MOVABLE | |
25985edc | 6622 | * because it is sized independent of architecture. Unlike the other zones, |
2a1e274a MG |
6623 | * the starting point for ZONE_MOVABLE is not fixed. It may be different |
6624 | * in each node depending on the size of each node and how evenly kernelcore | |
6625 | * is distributed. This helper function adjusts the zone ranges | |
6626 | * provided by the architecture for a given node by using the end of the | |
6627 | * highest usable zone for ZONE_MOVABLE. This preserves the assumption that | |
6628 | * zones within a node are in order of monotonic increases memory addresses | |
6629 | */ | |
bbe5d993 | 6630 | static void __init adjust_zone_range_for_zone_movable(int nid, |
2a1e274a MG |
6631 | unsigned long zone_type, |
6632 | unsigned long node_start_pfn, | |
6633 | unsigned long node_end_pfn, | |
6634 | unsigned long *zone_start_pfn, | |
6635 | unsigned long *zone_end_pfn) | |
6636 | { | |
6637 | /* Only adjust if ZONE_MOVABLE is on this node */ | |
6638 | if (zone_movable_pfn[nid]) { | |
6639 | /* Size ZONE_MOVABLE */ | |
6640 | if (zone_type == ZONE_MOVABLE) { | |
6641 | *zone_start_pfn = zone_movable_pfn[nid]; | |
6642 | *zone_end_pfn = min(node_end_pfn, | |
6643 | arch_zone_highest_possible_pfn[movable_zone]); | |
6644 | ||
e506b996 XQ |
6645 | /* Adjust for ZONE_MOVABLE starting within this range */ |
6646 | } else if (!mirrored_kernelcore && | |
6647 | *zone_start_pfn < zone_movable_pfn[nid] && | |
6648 | *zone_end_pfn > zone_movable_pfn[nid]) { | |
6649 | *zone_end_pfn = zone_movable_pfn[nid]; | |
6650 | ||
2a1e274a MG |
6651 | /* Check if this whole range is within ZONE_MOVABLE */ |
6652 | } else if (*zone_start_pfn >= zone_movable_pfn[nid]) | |
6653 | *zone_start_pfn = *zone_end_pfn; | |
6654 | } | |
6655 | } | |
6656 | ||
c713216d MG |
6657 | /* |
6658 | * Return the number of pages a zone spans in a node, including holes | |
6659 | * present_pages = zone_spanned_pages_in_node() - zone_absent_pages_in_node() | |
6660 | */ | |
bbe5d993 | 6661 | static unsigned long __init zone_spanned_pages_in_node(int nid, |
c713216d | 6662 | unsigned long zone_type, |
7960aedd ZY |
6663 | unsigned long node_start_pfn, |
6664 | unsigned long node_end_pfn, | |
d91749c1 | 6665 | unsigned long *zone_start_pfn, |
854e8848 | 6666 | unsigned long *zone_end_pfn) |
c713216d | 6667 | { |
299c83dc LF |
6668 | unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type]; |
6669 | unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type]; | |
b5685e92 | 6670 | /* When hotadd a new node from cpu_up(), the node should be empty */ |
f9126ab9 XQ |
6671 | if (!node_start_pfn && !node_end_pfn) |
6672 | return 0; | |
6673 | ||
7960aedd | 6674 | /* Get the start and end of the zone */ |
299c83dc LF |
6675 | *zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high); |
6676 | *zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high); | |
2a1e274a MG |
6677 | adjust_zone_range_for_zone_movable(nid, zone_type, |
6678 | node_start_pfn, node_end_pfn, | |
d91749c1 | 6679 | zone_start_pfn, zone_end_pfn); |
c713216d MG |
6680 | |
6681 | /* Check that this node has pages within the zone's required range */ | |
d91749c1 | 6682 | if (*zone_end_pfn < node_start_pfn || *zone_start_pfn > node_end_pfn) |
c713216d MG |
6683 | return 0; |
6684 | ||
6685 | /* Move the zone boundaries inside the node if necessary */ | |
d91749c1 TI |
6686 | *zone_end_pfn = min(*zone_end_pfn, node_end_pfn); |
6687 | *zone_start_pfn = max(*zone_start_pfn, node_start_pfn); | |
c713216d MG |
6688 | |
6689 | /* Return the spanned pages */ | |
d91749c1 | 6690 | return *zone_end_pfn - *zone_start_pfn; |
c713216d MG |
6691 | } |
6692 | ||
6693 | /* | |
6694 | * Return the number of holes in a range on a node. If nid is MAX_NUMNODES, | |
88ca3b94 | 6695 | * then all holes in the requested range will be accounted for. |
c713216d | 6696 | */ |
bbe5d993 | 6697 | unsigned long __init __absent_pages_in_range(int nid, |
c713216d MG |
6698 | unsigned long range_start_pfn, |
6699 | unsigned long range_end_pfn) | |
6700 | { | |
96e907d1 TH |
6701 | unsigned long nr_absent = range_end_pfn - range_start_pfn; |
6702 | unsigned long start_pfn, end_pfn; | |
6703 | int i; | |
c713216d | 6704 | |
96e907d1 TH |
6705 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
6706 | start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn); | |
6707 | end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn); | |
6708 | nr_absent -= end_pfn - start_pfn; | |
c713216d | 6709 | } |
96e907d1 | 6710 | return nr_absent; |
c713216d MG |
6711 | } |
6712 | ||
6713 | /** | |
6714 | * absent_pages_in_range - Return number of page frames in holes within a range | |
6715 | * @start_pfn: The start PFN to start searching for holes | |
6716 | * @end_pfn: The end PFN to stop searching for holes | |
6717 | * | |
a862f68a | 6718 | * Return: the number of pages frames in memory holes within a range. |
c713216d MG |
6719 | */ |
6720 | unsigned long __init absent_pages_in_range(unsigned long start_pfn, | |
6721 | unsigned long end_pfn) | |
6722 | { | |
6723 | return __absent_pages_in_range(MAX_NUMNODES, start_pfn, end_pfn); | |
6724 | } | |
6725 | ||
6726 | /* Return the number of page frames in holes in a zone on a node */ | |
bbe5d993 | 6727 | static unsigned long __init zone_absent_pages_in_node(int nid, |
c713216d | 6728 | unsigned long zone_type, |
7960aedd | 6729 | unsigned long node_start_pfn, |
854e8848 | 6730 | unsigned long node_end_pfn) |
c713216d | 6731 | { |
96e907d1 TH |
6732 | unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type]; |
6733 | unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type]; | |
9c7cd687 | 6734 | unsigned long zone_start_pfn, zone_end_pfn; |
342332e6 | 6735 | unsigned long nr_absent; |
9c7cd687 | 6736 | |
b5685e92 | 6737 | /* When hotadd a new node from cpu_up(), the node should be empty */ |
f9126ab9 XQ |
6738 | if (!node_start_pfn && !node_end_pfn) |
6739 | return 0; | |
6740 | ||
96e907d1 TH |
6741 | zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high); |
6742 | zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high); | |
9c7cd687 | 6743 | |
2a1e274a MG |
6744 | adjust_zone_range_for_zone_movable(nid, zone_type, |
6745 | node_start_pfn, node_end_pfn, | |
6746 | &zone_start_pfn, &zone_end_pfn); | |
342332e6 TI |
6747 | nr_absent = __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); |
6748 | ||
6749 | /* | |
6750 | * ZONE_MOVABLE handling. | |
6751 | * Treat pages to be ZONE_MOVABLE in ZONE_NORMAL as absent pages | |
6752 | * and vice versa. | |
6753 | */ | |
e506b996 XQ |
6754 | if (mirrored_kernelcore && zone_movable_pfn[nid]) { |
6755 | unsigned long start_pfn, end_pfn; | |
6756 | struct memblock_region *r; | |
6757 | ||
cc6de168 | 6758 | for_each_mem_region(r) { |
e506b996 XQ |
6759 | start_pfn = clamp(memblock_region_memory_base_pfn(r), |
6760 | zone_start_pfn, zone_end_pfn); | |
6761 | end_pfn = clamp(memblock_region_memory_end_pfn(r), | |
6762 | zone_start_pfn, zone_end_pfn); | |
6763 | ||
6764 | if (zone_type == ZONE_MOVABLE && | |
6765 | memblock_is_mirror(r)) | |
6766 | nr_absent += end_pfn - start_pfn; | |
6767 | ||
6768 | if (zone_type == ZONE_NORMAL && | |
6769 | !memblock_is_mirror(r)) | |
6770 | nr_absent += end_pfn - start_pfn; | |
342332e6 TI |
6771 | } |
6772 | } | |
6773 | ||
6774 | return nr_absent; | |
c713216d | 6775 | } |
0e0b864e | 6776 | |
bbe5d993 | 6777 | static void __init calculate_node_totalpages(struct pglist_data *pgdat, |
7960aedd | 6778 | unsigned long node_start_pfn, |
854e8848 | 6779 | unsigned long node_end_pfn) |
c713216d | 6780 | { |
febd5949 | 6781 | unsigned long realtotalpages = 0, totalpages = 0; |
c713216d MG |
6782 | enum zone_type i; |
6783 | ||
febd5949 GZ |
6784 | for (i = 0; i < MAX_NR_ZONES; i++) { |
6785 | struct zone *zone = pgdat->node_zones + i; | |
d91749c1 | 6786 | unsigned long zone_start_pfn, zone_end_pfn; |
3f08a302 | 6787 | unsigned long spanned, absent; |
febd5949 | 6788 | unsigned long size, real_size; |
c713216d | 6789 | |
854e8848 MR |
6790 | spanned = zone_spanned_pages_in_node(pgdat->node_id, i, |
6791 | node_start_pfn, | |
6792 | node_end_pfn, | |
6793 | &zone_start_pfn, | |
6794 | &zone_end_pfn); | |
6795 | absent = zone_absent_pages_in_node(pgdat->node_id, i, | |
6796 | node_start_pfn, | |
6797 | node_end_pfn); | |
3f08a302 MR |
6798 | |
6799 | size = spanned; | |
6800 | real_size = size - absent; | |
6801 | ||
d91749c1 TI |
6802 | if (size) |
6803 | zone->zone_start_pfn = zone_start_pfn; | |
6804 | else | |
6805 | zone->zone_start_pfn = 0; | |
febd5949 GZ |
6806 | zone->spanned_pages = size; |
6807 | zone->present_pages = real_size; | |
6808 | ||
6809 | totalpages += size; | |
6810 | realtotalpages += real_size; | |
6811 | } | |
6812 | ||
6813 | pgdat->node_spanned_pages = totalpages; | |
c713216d MG |
6814 | pgdat->node_present_pages = realtotalpages; |
6815 | printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, | |
6816 | realtotalpages); | |
6817 | } | |
6818 | ||
835c134e MG |
6819 | #ifndef CONFIG_SPARSEMEM |
6820 | /* | |
6821 | * Calculate the size of the zone->blockflags rounded to an unsigned long | |
d9c23400 MG |
6822 | * Start by making sure zonesize is a multiple of pageblock_order by rounding |
6823 | * up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally | |
835c134e MG |
6824 | * round what is now in bits to nearest long in bits, then return it in |
6825 | * bytes. | |
6826 | */ | |
7c45512d | 6827 | static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned long zonesize) |
835c134e MG |
6828 | { |
6829 | unsigned long usemapsize; | |
6830 | ||
7c45512d | 6831 | zonesize += zone_start_pfn & (pageblock_nr_pages-1); |
d9c23400 MG |
6832 | usemapsize = roundup(zonesize, pageblock_nr_pages); |
6833 | usemapsize = usemapsize >> pageblock_order; | |
835c134e MG |
6834 | usemapsize *= NR_PAGEBLOCK_BITS; |
6835 | usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long)); | |
6836 | ||
6837 | return usemapsize / 8; | |
6838 | } | |
6839 | ||
7cc2a959 | 6840 | static void __ref setup_usemap(struct pglist_data *pgdat, |
7c45512d LT |
6841 | struct zone *zone, |
6842 | unsigned long zone_start_pfn, | |
6843 | unsigned long zonesize) | |
835c134e | 6844 | { |
7c45512d | 6845 | unsigned long usemapsize = usemap_size(zone_start_pfn, zonesize); |
835c134e | 6846 | zone->pageblock_flags = NULL; |
23a7052a | 6847 | if (usemapsize) { |
6782832e | 6848 | zone->pageblock_flags = |
26fb3dae MR |
6849 | memblock_alloc_node(usemapsize, SMP_CACHE_BYTES, |
6850 | pgdat->node_id); | |
23a7052a MR |
6851 | if (!zone->pageblock_flags) |
6852 | panic("Failed to allocate %ld bytes for zone %s pageblock flags on node %d\n", | |
6853 | usemapsize, zone->name, pgdat->node_id); | |
6854 | } | |
835c134e MG |
6855 | } |
6856 | #else | |
7c45512d LT |
6857 | static inline void setup_usemap(struct pglist_data *pgdat, struct zone *zone, |
6858 | unsigned long zone_start_pfn, unsigned long zonesize) {} | |
835c134e MG |
6859 | #endif /* CONFIG_SPARSEMEM */ |
6860 | ||
d9c23400 | 6861 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
ba72cb8c | 6862 | |
d9c23400 | 6863 | /* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */ |
03e85f9d | 6864 | void __init set_pageblock_order(void) |
d9c23400 | 6865 | { |
955c1cd7 AM |
6866 | unsigned int order; |
6867 | ||
d9c23400 MG |
6868 | /* Check that pageblock_nr_pages has not already been setup */ |
6869 | if (pageblock_order) | |
6870 | return; | |
6871 | ||
955c1cd7 AM |
6872 | if (HPAGE_SHIFT > PAGE_SHIFT) |
6873 | order = HUGETLB_PAGE_ORDER; | |
6874 | else | |
6875 | order = MAX_ORDER - 1; | |
6876 | ||
d9c23400 MG |
6877 | /* |
6878 | * Assume the largest contiguous order of interest is a huge page. | |
955c1cd7 AM |
6879 | * This value may be variable depending on boot parameters on IA64 and |
6880 | * powerpc. | |
d9c23400 MG |
6881 | */ |
6882 | pageblock_order = order; | |
6883 | } | |
6884 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
6885 | ||
ba72cb8c MG |
6886 | /* |
6887 | * When CONFIG_HUGETLB_PAGE_SIZE_VARIABLE is not set, set_pageblock_order() | |
955c1cd7 AM |
6888 | * is unused as pageblock_order is set at compile-time. See |
6889 | * include/linux/pageblock-flags.h for the values of pageblock_order based on | |
6890 | * the kernel config | |
ba72cb8c | 6891 | */ |
03e85f9d | 6892 | void __init set_pageblock_order(void) |
ba72cb8c | 6893 | { |
ba72cb8c | 6894 | } |
d9c23400 MG |
6895 | |
6896 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
6897 | ||
03e85f9d | 6898 | static unsigned long __init calc_memmap_size(unsigned long spanned_pages, |
7cc2a959 | 6899 | unsigned long present_pages) |
01cefaef JL |
6900 | { |
6901 | unsigned long pages = spanned_pages; | |
6902 | ||
6903 | /* | |
6904 | * Provide a more accurate estimation if there are holes within | |
6905 | * the zone and SPARSEMEM is in use. If there are holes within the | |
6906 | * zone, each populated memory region may cost us one or two extra | |
6907 | * memmap pages due to alignment because memmap pages for each | |
89d790ab | 6908 | * populated regions may not be naturally aligned on page boundary. |
01cefaef JL |
6909 | * So the (present_pages >> 4) heuristic is a tradeoff for that. |
6910 | */ | |
6911 | if (spanned_pages > present_pages + (present_pages >> 4) && | |
6912 | IS_ENABLED(CONFIG_SPARSEMEM)) | |
6913 | pages = present_pages; | |
6914 | ||
6915 | return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT; | |
6916 | } | |
6917 | ||
ace1db39 OS |
6918 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
6919 | static void pgdat_init_split_queue(struct pglist_data *pgdat) | |
6920 | { | |
364c1eeb YS |
6921 | struct deferred_split *ds_queue = &pgdat->deferred_split_queue; |
6922 | ||
6923 | spin_lock_init(&ds_queue->split_queue_lock); | |
6924 | INIT_LIST_HEAD(&ds_queue->split_queue); | |
6925 | ds_queue->split_queue_len = 0; | |
ace1db39 OS |
6926 | } |
6927 | #else | |
6928 | static void pgdat_init_split_queue(struct pglist_data *pgdat) {} | |
6929 | #endif | |
6930 | ||
6931 | #ifdef CONFIG_COMPACTION | |
6932 | static void pgdat_init_kcompactd(struct pglist_data *pgdat) | |
6933 | { | |
6934 | init_waitqueue_head(&pgdat->kcompactd_wait); | |
6935 | } | |
6936 | #else | |
6937 | static void pgdat_init_kcompactd(struct pglist_data *pgdat) {} | |
6938 | #endif | |
6939 | ||
03e85f9d | 6940 | static void __meminit pgdat_init_internals(struct pglist_data *pgdat) |
1da177e4 | 6941 | { |
208d54e5 | 6942 | pgdat_resize_init(pgdat); |
ace1db39 | 6943 | |
ace1db39 OS |
6944 | pgdat_init_split_queue(pgdat); |
6945 | pgdat_init_kcompactd(pgdat); | |
6946 | ||
1da177e4 | 6947 | init_waitqueue_head(&pgdat->kswapd_wait); |
5515061d | 6948 | init_waitqueue_head(&pgdat->pfmemalloc_wait); |
ace1db39 | 6949 | |
eefa864b | 6950 | pgdat_page_ext_init(pgdat); |
867e5e1d | 6951 | lruvec_init(&pgdat->__lruvec); |
03e85f9d OS |
6952 | } |
6953 | ||
6954 | static void __meminit zone_init_internals(struct zone *zone, enum zone_type idx, int nid, | |
6955 | unsigned long remaining_pages) | |
6956 | { | |
9705bea5 | 6957 | atomic_long_set(&zone->managed_pages, remaining_pages); |
03e85f9d OS |
6958 | zone_set_nid(zone, nid); |
6959 | zone->name = zone_names[idx]; | |
6960 | zone->zone_pgdat = NODE_DATA(nid); | |
6961 | spin_lock_init(&zone->lock); | |
6962 | zone_seqlock_init(zone); | |
6963 | zone_pcp_init(zone); | |
6964 | } | |
6965 | ||
6966 | /* | |
6967 | * Set up the zone data structures | |
6968 | * - init pgdat internals | |
6969 | * - init all zones belonging to this node | |
6970 | * | |
6971 | * NOTE: this function is only called during memory hotplug | |
6972 | */ | |
6973 | #ifdef CONFIG_MEMORY_HOTPLUG | |
6974 | void __ref free_area_init_core_hotplug(int nid) | |
6975 | { | |
6976 | enum zone_type z; | |
6977 | pg_data_t *pgdat = NODE_DATA(nid); | |
6978 | ||
6979 | pgdat_init_internals(pgdat); | |
6980 | for (z = 0; z < MAX_NR_ZONES; z++) | |
6981 | zone_init_internals(&pgdat->node_zones[z], z, nid, 0); | |
6982 | } | |
6983 | #endif | |
6984 | ||
6985 | /* | |
6986 | * Set up the zone data structures: | |
6987 | * - mark all pages reserved | |
6988 | * - mark all memory queues empty | |
6989 | * - clear the memory bitmaps | |
6990 | * | |
6991 | * NOTE: pgdat should get zeroed by caller. | |
6992 | * NOTE: this function is only called during early init. | |
6993 | */ | |
6994 | static void __init free_area_init_core(struct pglist_data *pgdat) | |
6995 | { | |
6996 | enum zone_type j; | |
6997 | int nid = pgdat->node_id; | |
5f63b720 | 6998 | |
03e85f9d | 6999 | pgdat_init_internals(pgdat); |
385386cf JW |
7000 | pgdat->per_cpu_nodestats = &boot_nodestats; |
7001 | ||
1da177e4 LT |
7002 | for (j = 0; j < MAX_NR_ZONES; j++) { |
7003 | struct zone *zone = pgdat->node_zones + j; | |
e6943859 | 7004 | unsigned long size, freesize, memmap_pages; |
d91749c1 | 7005 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
1da177e4 | 7006 | |
febd5949 | 7007 | size = zone->spanned_pages; |
e6943859 | 7008 | freesize = zone->present_pages; |
1da177e4 | 7009 | |
0e0b864e | 7010 | /* |
9feedc9d | 7011 | * Adjust freesize so that it accounts for how much memory |
0e0b864e MG |
7012 | * is used by this zone for memmap. This affects the watermark |
7013 | * and per-cpu initialisations | |
7014 | */ | |
e6943859 | 7015 | memmap_pages = calc_memmap_size(size, freesize); |
ba914f48 ZH |
7016 | if (!is_highmem_idx(j)) { |
7017 | if (freesize >= memmap_pages) { | |
7018 | freesize -= memmap_pages; | |
7019 | if (memmap_pages) | |
7020 | printk(KERN_DEBUG | |
7021 | " %s zone: %lu pages used for memmap\n", | |
7022 | zone_names[j], memmap_pages); | |
7023 | } else | |
1170532b | 7024 | pr_warn(" %s zone: %lu pages exceeds freesize %lu\n", |
ba914f48 ZH |
7025 | zone_names[j], memmap_pages, freesize); |
7026 | } | |
0e0b864e | 7027 | |
6267276f | 7028 | /* Account for reserved pages */ |
9feedc9d JL |
7029 | if (j == 0 && freesize > dma_reserve) { |
7030 | freesize -= dma_reserve; | |
d903ef9f | 7031 | printk(KERN_DEBUG " %s zone: %lu pages reserved\n", |
6267276f | 7032 | zone_names[0], dma_reserve); |
0e0b864e MG |
7033 | } |
7034 | ||
98d2b0eb | 7035 | if (!is_highmem_idx(j)) |
9feedc9d | 7036 | nr_kernel_pages += freesize; |
01cefaef JL |
7037 | /* Charge for highmem memmap if there are enough kernel pages */ |
7038 | else if (nr_kernel_pages > memmap_pages * 2) | |
7039 | nr_kernel_pages -= memmap_pages; | |
9feedc9d | 7040 | nr_all_pages += freesize; |
1da177e4 | 7041 | |
9feedc9d JL |
7042 | /* |
7043 | * Set an approximate value for lowmem here, it will be adjusted | |
7044 | * when the bootmem allocator frees pages into the buddy system. | |
7045 | * And all highmem pages will be managed by the buddy system. | |
7046 | */ | |
03e85f9d | 7047 | zone_init_internals(zone, j, nid, freesize); |
81c0a2bb | 7048 | |
d883c6cf | 7049 | if (!size) |
1da177e4 LT |
7050 | continue; |
7051 | ||
955c1cd7 | 7052 | set_pageblock_order(); |
d883c6cf JK |
7053 | setup_usemap(pgdat, zone, zone_start_pfn, size); |
7054 | init_currently_empty_zone(zone, zone_start_pfn, size); | |
76cdd58e | 7055 | memmap_init(size, nid, j, zone_start_pfn); |
1da177e4 LT |
7056 | } |
7057 | } | |
7058 | ||
0cd842f9 | 7059 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
bd721ea7 | 7060 | static void __ref alloc_node_mem_map(struct pglist_data *pgdat) |
1da177e4 | 7061 | { |
b0aeba74 | 7062 | unsigned long __maybe_unused start = 0; |
a1c34a3b LA |
7063 | unsigned long __maybe_unused offset = 0; |
7064 | ||
1da177e4 LT |
7065 | /* Skip empty nodes */ |
7066 | if (!pgdat->node_spanned_pages) | |
7067 | return; | |
7068 | ||
b0aeba74 TL |
7069 | start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); |
7070 | offset = pgdat->node_start_pfn - start; | |
1da177e4 LT |
7071 | /* ia64 gets its own node_mem_map, before this, without bootmem */ |
7072 | if (!pgdat->node_mem_map) { | |
b0aeba74 | 7073 | unsigned long size, end; |
d41dee36 AW |
7074 | struct page *map; |
7075 | ||
e984bb43 BP |
7076 | /* |
7077 | * The zone's endpoints aren't required to be MAX_ORDER | |
7078 | * aligned but the node_mem_map endpoints must be in order | |
7079 | * for the buddy allocator to function correctly. | |
7080 | */ | |
108bcc96 | 7081 | end = pgdat_end_pfn(pgdat); |
e984bb43 BP |
7082 | end = ALIGN(end, MAX_ORDER_NR_PAGES); |
7083 | size = (end - start) * sizeof(struct page); | |
26fb3dae MR |
7084 | map = memblock_alloc_node(size, SMP_CACHE_BYTES, |
7085 | pgdat->node_id); | |
23a7052a MR |
7086 | if (!map) |
7087 | panic("Failed to allocate %ld bytes for node %d memory map\n", | |
7088 | size, pgdat->node_id); | |
a1c34a3b | 7089 | pgdat->node_mem_map = map + offset; |
1da177e4 | 7090 | } |
0cd842f9 OS |
7091 | pr_debug("%s: node %d, pgdat %08lx, node_mem_map %08lx\n", |
7092 | __func__, pgdat->node_id, (unsigned long)pgdat, | |
7093 | (unsigned long)pgdat->node_mem_map); | |
12d810c1 | 7094 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
7095 | /* |
7096 | * With no DISCONTIG, the global mem_map is just set as node 0's | |
7097 | */ | |
c713216d | 7098 | if (pgdat == NODE_DATA(0)) { |
1da177e4 | 7099 | mem_map = NODE_DATA(0)->node_mem_map; |
c713216d | 7100 | if (page_to_pfn(mem_map) != pgdat->node_start_pfn) |
a1c34a3b | 7101 | mem_map -= offset; |
c713216d | 7102 | } |
1da177e4 LT |
7103 | #endif |
7104 | } | |
0cd842f9 OS |
7105 | #else |
7106 | static void __ref alloc_node_mem_map(struct pglist_data *pgdat) { } | |
7107 | #endif /* CONFIG_FLAT_NODE_MEM_MAP */ | |
1da177e4 | 7108 | |
0188dc98 OS |
7109 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
7110 | static inline void pgdat_set_deferred_range(pg_data_t *pgdat) | |
7111 | { | |
0188dc98 OS |
7112 | pgdat->first_deferred_pfn = ULONG_MAX; |
7113 | } | |
7114 | #else | |
7115 | static inline void pgdat_set_deferred_range(pg_data_t *pgdat) {} | |
7116 | #endif | |
7117 | ||
854e8848 | 7118 | static void __init free_area_init_node(int nid) |
1da177e4 | 7119 | { |
9109fb7b | 7120 | pg_data_t *pgdat = NODE_DATA(nid); |
7960aedd ZY |
7121 | unsigned long start_pfn = 0; |
7122 | unsigned long end_pfn = 0; | |
9109fb7b | 7123 | |
88fdf75d | 7124 | /* pg_data_t should be reset to zero when it's allocated */ |
97a225e6 | 7125 | WARN_ON(pgdat->nr_zones || pgdat->kswapd_highest_zoneidx); |
88fdf75d | 7126 | |
854e8848 | 7127 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); |
88fdf75d | 7128 | |
1da177e4 | 7129 | pgdat->node_id = nid; |
854e8848 | 7130 | pgdat->node_start_pfn = start_pfn; |
75ef7184 | 7131 | pgdat->per_cpu_nodestats = NULL; |
854e8848 | 7132 | |
8d29e18a | 7133 | pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid, |
4ada0c5a ZL |
7134 | (u64)start_pfn << PAGE_SHIFT, |
7135 | end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0); | |
854e8848 | 7136 | calculate_node_totalpages(pgdat, start_pfn, end_pfn); |
1da177e4 LT |
7137 | |
7138 | alloc_node_mem_map(pgdat); | |
0188dc98 | 7139 | pgdat_set_deferred_range(pgdat); |
1da177e4 | 7140 | |
7f3eb55b | 7141 | free_area_init_core(pgdat); |
1da177e4 LT |
7142 | } |
7143 | ||
bc9331a1 | 7144 | void __init free_area_init_memoryless_node(int nid) |
3f08a302 | 7145 | { |
854e8848 | 7146 | free_area_init_node(nid); |
3f08a302 MR |
7147 | } |
7148 | ||
418508c1 MS |
7149 | #if MAX_NUMNODES > 1 |
7150 | /* | |
7151 | * Figure out the number of possible node ids. | |
7152 | */ | |
f9872caf | 7153 | void __init setup_nr_node_ids(void) |
418508c1 | 7154 | { |
904a9553 | 7155 | unsigned int highest; |
418508c1 | 7156 | |
904a9553 | 7157 | highest = find_last_bit(node_possible_map.bits, MAX_NUMNODES); |
418508c1 MS |
7158 | nr_node_ids = highest + 1; |
7159 | } | |
418508c1 MS |
7160 | #endif |
7161 | ||
1e01979c TH |
7162 | /** |
7163 | * node_map_pfn_alignment - determine the maximum internode alignment | |
7164 | * | |
7165 | * This function should be called after node map is populated and sorted. | |
7166 | * It calculates the maximum power of two alignment which can distinguish | |
7167 | * all the nodes. | |
7168 | * | |
7169 | * For example, if all nodes are 1GiB and aligned to 1GiB, the return value | |
7170 | * would indicate 1GiB alignment with (1 << (30 - PAGE_SHIFT)). If the | |
7171 | * nodes are shifted by 256MiB, 256MiB. Note that if only the last node is | |
7172 | * shifted, 1GiB is enough and this function will indicate so. | |
7173 | * | |
7174 | * This is used to test whether pfn -> nid mapping of the chosen memory | |
7175 | * model has fine enough granularity to avoid incorrect mapping for the | |
7176 | * populated node map. | |
7177 | * | |
a862f68a | 7178 | * Return: the determined alignment in pfn's. 0 if there is no alignment |
1e01979c TH |
7179 | * requirement (single node). |
7180 | */ | |
7181 | unsigned long __init node_map_pfn_alignment(void) | |
7182 | { | |
7183 | unsigned long accl_mask = 0, last_end = 0; | |
c13291a5 | 7184 | unsigned long start, end, mask; |
98fa15f3 | 7185 | int last_nid = NUMA_NO_NODE; |
c13291a5 | 7186 | int i, nid; |
1e01979c | 7187 | |
c13291a5 | 7188 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) { |
1e01979c TH |
7189 | if (!start || last_nid < 0 || last_nid == nid) { |
7190 | last_nid = nid; | |
7191 | last_end = end; | |
7192 | continue; | |
7193 | } | |
7194 | ||
7195 | /* | |
7196 | * Start with a mask granular enough to pin-point to the | |
7197 | * start pfn and tick off bits one-by-one until it becomes | |
7198 | * too coarse to separate the current node from the last. | |
7199 | */ | |
7200 | mask = ~((1 << __ffs(start)) - 1); | |
7201 | while (mask && last_end <= (start & (mask << 1))) | |
7202 | mask <<= 1; | |
7203 | ||
7204 | /* accumulate all internode masks */ | |
7205 | accl_mask |= mask; | |
7206 | } | |
7207 | ||
7208 | /* convert mask to number of pages */ | |
7209 | return ~accl_mask + 1; | |
7210 | } | |
7211 | ||
c713216d MG |
7212 | /** |
7213 | * find_min_pfn_with_active_regions - Find the minimum PFN registered | |
7214 | * | |
a862f68a | 7215 | * Return: the minimum PFN based on information provided via |
7d018176 | 7216 | * memblock_set_node(). |
c713216d MG |
7217 | */ |
7218 | unsigned long __init find_min_pfn_with_active_regions(void) | |
7219 | { | |
8a1b25fe | 7220 | return PHYS_PFN(memblock_start_of_DRAM()); |
c713216d MG |
7221 | } |
7222 | ||
37b07e41 LS |
7223 | /* |
7224 | * early_calculate_totalpages() | |
7225 | * Sum pages in active regions for movable zone. | |
4b0ef1fe | 7226 | * Populate N_MEMORY for calculating usable_nodes. |
37b07e41 | 7227 | */ |
484f51f8 | 7228 | static unsigned long __init early_calculate_totalpages(void) |
7e63efef | 7229 | { |
7e63efef | 7230 | unsigned long totalpages = 0; |
c13291a5 TH |
7231 | unsigned long start_pfn, end_pfn; |
7232 | int i, nid; | |
7233 | ||
7234 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { | |
7235 | unsigned long pages = end_pfn - start_pfn; | |
7e63efef | 7236 | |
37b07e41 LS |
7237 | totalpages += pages; |
7238 | if (pages) | |
4b0ef1fe | 7239 | node_set_state(nid, N_MEMORY); |
37b07e41 | 7240 | } |
b8af2941 | 7241 | return totalpages; |
7e63efef MG |
7242 | } |
7243 | ||
2a1e274a MG |
7244 | /* |
7245 | * Find the PFN the Movable zone begins in each node. Kernel memory | |
7246 | * is spread evenly between nodes as long as the nodes have enough | |
7247 | * memory. When they don't, some nodes will have more kernelcore than | |
7248 | * others | |
7249 | */ | |
b224ef85 | 7250 | static void __init find_zone_movable_pfns_for_nodes(void) |
2a1e274a MG |
7251 | { |
7252 | int i, nid; | |
7253 | unsigned long usable_startpfn; | |
7254 | unsigned long kernelcore_node, kernelcore_remaining; | |
66918dcd | 7255 | /* save the state before borrow the nodemask */ |
4b0ef1fe | 7256 | nodemask_t saved_node_state = node_states[N_MEMORY]; |
37b07e41 | 7257 | unsigned long totalpages = early_calculate_totalpages(); |
4b0ef1fe | 7258 | int usable_nodes = nodes_weight(node_states[N_MEMORY]); |
136199f0 | 7259 | struct memblock_region *r; |
b2f3eebe TC |
7260 | |
7261 | /* Need to find movable_zone earlier when movable_node is specified. */ | |
7262 | find_usable_zone_for_movable(); | |
7263 | ||
7264 | /* | |
7265 | * If movable_node is specified, ignore kernelcore and movablecore | |
7266 | * options. | |
7267 | */ | |
7268 | if (movable_node_is_enabled()) { | |
cc6de168 | 7269 | for_each_mem_region(r) { |
136199f0 | 7270 | if (!memblock_is_hotpluggable(r)) |
b2f3eebe TC |
7271 | continue; |
7272 | ||
d622abf7 | 7273 | nid = memblock_get_region_node(r); |
b2f3eebe | 7274 | |
136199f0 | 7275 | usable_startpfn = PFN_DOWN(r->base); |
b2f3eebe TC |
7276 | zone_movable_pfn[nid] = zone_movable_pfn[nid] ? |
7277 | min(usable_startpfn, zone_movable_pfn[nid]) : | |
7278 | usable_startpfn; | |
7279 | } | |
7280 | ||
7281 | goto out2; | |
7282 | } | |
2a1e274a | 7283 | |
342332e6 TI |
7284 | /* |
7285 | * If kernelcore=mirror is specified, ignore movablecore option | |
7286 | */ | |
7287 | if (mirrored_kernelcore) { | |
7288 | bool mem_below_4gb_not_mirrored = false; | |
7289 | ||
cc6de168 | 7290 | for_each_mem_region(r) { |
342332e6 TI |
7291 | if (memblock_is_mirror(r)) |
7292 | continue; | |
7293 | ||
d622abf7 | 7294 | nid = memblock_get_region_node(r); |
342332e6 TI |
7295 | |
7296 | usable_startpfn = memblock_region_memory_base_pfn(r); | |
7297 | ||
7298 | if (usable_startpfn < 0x100000) { | |
7299 | mem_below_4gb_not_mirrored = true; | |
7300 | continue; | |
7301 | } | |
7302 | ||
7303 | zone_movable_pfn[nid] = zone_movable_pfn[nid] ? | |
7304 | min(usable_startpfn, zone_movable_pfn[nid]) : | |
7305 | usable_startpfn; | |
7306 | } | |
7307 | ||
7308 | if (mem_below_4gb_not_mirrored) | |
633bf2fe | 7309 | pr_warn("This configuration results in unmirrored kernel memory.\n"); |
342332e6 TI |
7310 | |
7311 | goto out2; | |
7312 | } | |
7313 | ||
7e63efef | 7314 | /* |
a5c6d650 DR |
7315 | * If kernelcore=nn% or movablecore=nn% was specified, calculate the |
7316 | * amount of necessary memory. | |
7317 | */ | |
7318 | if (required_kernelcore_percent) | |
7319 | required_kernelcore = (totalpages * 100 * required_kernelcore_percent) / | |
7320 | 10000UL; | |
7321 | if (required_movablecore_percent) | |
7322 | required_movablecore = (totalpages * 100 * required_movablecore_percent) / | |
7323 | 10000UL; | |
7324 | ||
7325 | /* | |
7326 | * If movablecore= was specified, calculate what size of | |
7e63efef MG |
7327 | * kernelcore that corresponds so that memory usable for |
7328 | * any allocation type is evenly spread. If both kernelcore | |
7329 | * and movablecore are specified, then the value of kernelcore | |
7330 | * will be used for required_kernelcore if it's greater than | |
7331 | * what movablecore would have allowed. | |
7332 | */ | |
7333 | if (required_movablecore) { | |
7e63efef MG |
7334 | unsigned long corepages; |
7335 | ||
7336 | /* | |
7337 | * Round-up so that ZONE_MOVABLE is at least as large as what | |
7338 | * was requested by the user | |
7339 | */ | |
7340 | required_movablecore = | |
7341 | roundup(required_movablecore, MAX_ORDER_NR_PAGES); | |
9fd745d4 | 7342 | required_movablecore = min(totalpages, required_movablecore); |
7e63efef MG |
7343 | corepages = totalpages - required_movablecore; |
7344 | ||
7345 | required_kernelcore = max(required_kernelcore, corepages); | |
7346 | } | |
7347 | ||
bde304bd XQ |
7348 | /* |
7349 | * If kernelcore was not specified or kernelcore size is larger | |
7350 | * than totalpages, there is no ZONE_MOVABLE. | |
7351 | */ | |
7352 | if (!required_kernelcore || required_kernelcore >= totalpages) | |
66918dcd | 7353 | goto out; |
2a1e274a MG |
7354 | |
7355 | /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ | |
2a1e274a MG |
7356 | usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; |
7357 | ||
7358 | restart: | |
7359 | /* Spread kernelcore memory as evenly as possible throughout nodes */ | |
7360 | kernelcore_node = required_kernelcore / usable_nodes; | |
4b0ef1fe | 7361 | for_each_node_state(nid, N_MEMORY) { |
c13291a5 TH |
7362 | unsigned long start_pfn, end_pfn; |
7363 | ||
2a1e274a MG |
7364 | /* |
7365 | * Recalculate kernelcore_node if the division per node | |
7366 | * now exceeds what is necessary to satisfy the requested | |
7367 | * amount of memory for the kernel | |
7368 | */ | |
7369 | if (required_kernelcore < kernelcore_node) | |
7370 | kernelcore_node = required_kernelcore / usable_nodes; | |
7371 | ||
7372 | /* | |
7373 | * As the map is walked, we track how much memory is usable | |
7374 | * by the kernel using kernelcore_remaining. When it is | |
7375 | * 0, the rest of the node is usable by ZONE_MOVABLE | |
7376 | */ | |
7377 | kernelcore_remaining = kernelcore_node; | |
7378 | ||
7379 | /* Go through each range of PFNs within this node */ | |
c13291a5 | 7380 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
2a1e274a MG |
7381 | unsigned long size_pages; |
7382 | ||
c13291a5 | 7383 | start_pfn = max(start_pfn, zone_movable_pfn[nid]); |
2a1e274a MG |
7384 | if (start_pfn >= end_pfn) |
7385 | continue; | |
7386 | ||
7387 | /* Account for what is only usable for kernelcore */ | |
7388 | if (start_pfn < usable_startpfn) { | |
7389 | unsigned long kernel_pages; | |
7390 | kernel_pages = min(end_pfn, usable_startpfn) | |
7391 | - start_pfn; | |
7392 | ||
7393 | kernelcore_remaining -= min(kernel_pages, | |
7394 | kernelcore_remaining); | |
7395 | required_kernelcore -= min(kernel_pages, | |
7396 | required_kernelcore); | |
7397 | ||
7398 | /* Continue if range is now fully accounted */ | |
7399 | if (end_pfn <= usable_startpfn) { | |
7400 | ||
7401 | /* | |
7402 | * Push zone_movable_pfn to the end so | |
7403 | * that if we have to rebalance | |
7404 | * kernelcore across nodes, we will | |
7405 | * not double account here | |
7406 | */ | |
7407 | zone_movable_pfn[nid] = end_pfn; | |
7408 | continue; | |
7409 | } | |
7410 | start_pfn = usable_startpfn; | |
7411 | } | |
7412 | ||
7413 | /* | |
7414 | * The usable PFN range for ZONE_MOVABLE is from | |
7415 | * start_pfn->end_pfn. Calculate size_pages as the | |
7416 | * number of pages used as kernelcore | |
7417 | */ | |
7418 | size_pages = end_pfn - start_pfn; | |
7419 | if (size_pages > kernelcore_remaining) | |
7420 | size_pages = kernelcore_remaining; | |
7421 | zone_movable_pfn[nid] = start_pfn + size_pages; | |
7422 | ||
7423 | /* | |
7424 | * Some kernelcore has been met, update counts and | |
7425 | * break if the kernelcore for this node has been | |
b8af2941 | 7426 | * satisfied |
2a1e274a MG |
7427 | */ |
7428 | required_kernelcore -= min(required_kernelcore, | |
7429 | size_pages); | |
7430 | kernelcore_remaining -= size_pages; | |
7431 | if (!kernelcore_remaining) | |
7432 | break; | |
7433 | } | |
7434 | } | |
7435 | ||
7436 | /* | |
7437 | * If there is still required_kernelcore, we do another pass with one | |
7438 | * less node in the count. This will push zone_movable_pfn[nid] further | |
7439 | * along on the nodes that still have memory until kernelcore is | |
b8af2941 | 7440 | * satisfied |
2a1e274a MG |
7441 | */ |
7442 | usable_nodes--; | |
7443 | if (usable_nodes && required_kernelcore > usable_nodes) | |
7444 | goto restart; | |
7445 | ||
b2f3eebe | 7446 | out2: |
2a1e274a MG |
7447 | /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */ |
7448 | for (nid = 0; nid < MAX_NUMNODES; nid++) | |
7449 | zone_movable_pfn[nid] = | |
7450 | roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES); | |
66918dcd | 7451 | |
20e6926d | 7452 | out: |
66918dcd | 7453 | /* restore the node_state */ |
4b0ef1fe | 7454 | node_states[N_MEMORY] = saved_node_state; |
2a1e274a MG |
7455 | } |
7456 | ||
4b0ef1fe LJ |
7457 | /* Any regular or high memory on that node ? */ |
7458 | static void check_for_memory(pg_data_t *pgdat, int nid) | |
37b07e41 | 7459 | { |
37b07e41 LS |
7460 | enum zone_type zone_type; |
7461 | ||
4b0ef1fe | 7462 | for (zone_type = 0; zone_type <= ZONE_MOVABLE - 1; zone_type++) { |
37b07e41 | 7463 | struct zone *zone = &pgdat->node_zones[zone_type]; |
b38a8725 | 7464 | if (populated_zone(zone)) { |
7b0e0c0e OS |
7465 | if (IS_ENABLED(CONFIG_HIGHMEM)) |
7466 | node_set_state(nid, N_HIGH_MEMORY); | |
7467 | if (zone_type <= ZONE_NORMAL) | |
4b0ef1fe | 7468 | node_set_state(nid, N_NORMAL_MEMORY); |
d0048b0e BL |
7469 | break; |
7470 | } | |
37b07e41 | 7471 | } |
37b07e41 LS |
7472 | } |
7473 | ||
51930df5 MR |
7474 | /* |
7475 | * Some architecturs, e.g. ARC may have ZONE_HIGHMEM below ZONE_NORMAL. For | |
7476 | * such cases we allow max_zone_pfn sorted in the descending order | |
7477 | */ | |
7478 | bool __weak arch_has_descending_max_zone_pfns(void) | |
7479 | { | |
7480 | return false; | |
7481 | } | |
7482 | ||
c713216d | 7483 | /** |
9691a071 | 7484 | * free_area_init - Initialise all pg_data_t and zone data |
88ca3b94 | 7485 | * @max_zone_pfn: an array of max PFNs for each zone |
c713216d MG |
7486 | * |
7487 | * This will call free_area_init_node() for each active node in the system. | |
7d018176 | 7488 | * Using the page ranges provided by memblock_set_node(), the size of each |
c713216d MG |
7489 | * zone in each node and their holes is calculated. If the maximum PFN |
7490 | * between two adjacent zones match, it is assumed that the zone is empty. | |
7491 | * For example, if arch_max_dma_pfn == arch_max_dma32_pfn, it is assumed | |
7492 | * that arch_max_dma32_pfn has no pages. It is also assumed that a zone | |
7493 | * starts where the previous one ended. For example, ZONE_DMA32 starts | |
7494 | * at arch_max_dma_pfn. | |
7495 | */ | |
9691a071 | 7496 | void __init free_area_init(unsigned long *max_zone_pfn) |
c713216d | 7497 | { |
c13291a5 | 7498 | unsigned long start_pfn, end_pfn; |
51930df5 MR |
7499 | int i, nid, zone; |
7500 | bool descending; | |
a6af2bc3 | 7501 | |
c713216d MG |
7502 | /* Record where the zone boundaries are */ |
7503 | memset(arch_zone_lowest_possible_pfn, 0, | |
7504 | sizeof(arch_zone_lowest_possible_pfn)); | |
7505 | memset(arch_zone_highest_possible_pfn, 0, | |
7506 | sizeof(arch_zone_highest_possible_pfn)); | |
90cae1fe OH |
7507 | |
7508 | start_pfn = find_min_pfn_with_active_regions(); | |
51930df5 | 7509 | descending = arch_has_descending_max_zone_pfns(); |
90cae1fe OH |
7510 | |
7511 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
51930df5 MR |
7512 | if (descending) |
7513 | zone = MAX_NR_ZONES - i - 1; | |
7514 | else | |
7515 | zone = i; | |
7516 | ||
7517 | if (zone == ZONE_MOVABLE) | |
2a1e274a | 7518 | continue; |
90cae1fe | 7519 | |
51930df5 MR |
7520 | end_pfn = max(max_zone_pfn[zone], start_pfn); |
7521 | arch_zone_lowest_possible_pfn[zone] = start_pfn; | |
7522 | arch_zone_highest_possible_pfn[zone] = end_pfn; | |
90cae1fe OH |
7523 | |
7524 | start_pfn = end_pfn; | |
c713216d | 7525 | } |
2a1e274a MG |
7526 | |
7527 | /* Find the PFNs that ZONE_MOVABLE begins at in each node */ | |
7528 | memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); | |
b224ef85 | 7529 | find_zone_movable_pfns_for_nodes(); |
c713216d | 7530 | |
c713216d | 7531 | /* Print out the zone ranges */ |
f88dfff5 | 7532 | pr_info("Zone ranges:\n"); |
2a1e274a MG |
7533 | for (i = 0; i < MAX_NR_ZONES; i++) { |
7534 | if (i == ZONE_MOVABLE) | |
7535 | continue; | |
f88dfff5 | 7536 | pr_info(" %-8s ", zone_names[i]); |
72f0ba02 DR |
7537 | if (arch_zone_lowest_possible_pfn[i] == |
7538 | arch_zone_highest_possible_pfn[i]) | |
f88dfff5 | 7539 | pr_cont("empty\n"); |
72f0ba02 | 7540 | else |
8d29e18a JG |
7541 | pr_cont("[mem %#018Lx-%#018Lx]\n", |
7542 | (u64)arch_zone_lowest_possible_pfn[i] | |
7543 | << PAGE_SHIFT, | |
7544 | ((u64)arch_zone_highest_possible_pfn[i] | |
a62e2f4f | 7545 | << PAGE_SHIFT) - 1); |
2a1e274a MG |
7546 | } |
7547 | ||
7548 | /* Print out the PFNs ZONE_MOVABLE begins at in each node */ | |
f88dfff5 | 7549 | pr_info("Movable zone start for each node\n"); |
2a1e274a MG |
7550 | for (i = 0; i < MAX_NUMNODES; i++) { |
7551 | if (zone_movable_pfn[i]) | |
8d29e18a JG |
7552 | pr_info(" Node %d: %#018Lx\n", i, |
7553 | (u64)zone_movable_pfn[i] << PAGE_SHIFT); | |
2a1e274a | 7554 | } |
c713216d | 7555 | |
f46edbd1 DW |
7556 | /* |
7557 | * Print out the early node map, and initialize the | |
7558 | * subsection-map relative to active online memory ranges to | |
7559 | * enable future "sub-section" extensions of the memory map. | |
7560 | */ | |
f88dfff5 | 7561 | pr_info("Early memory node ranges\n"); |
f46edbd1 | 7562 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { |
8d29e18a JG |
7563 | pr_info(" node %3d: [mem %#018Lx-%#018Lx]\n", nid, |
7564 | (u64)start_pfn << PAGE_SHIFT, | |
7565 | ((u64)end_pfn << PAGE_SHIFT) - 1); | |
f46edbd1 DW |
7566 | subsection_map_init(start_pfn, end_pfn - start_pfn); |
7567 | } | |
c713216d MG |
7568 | |
7569 | /* Initialise every node */ | |
708614e6 | 7570 | mminit_verify_pageflags_layout(); |
8ef82866 | 7571 | setup_nr_node_ids(); |
c713216d MG |
7572 | for_each_online_node(nid) { |
7573 | pg_data_t *pgdat = NODE_DATA(nid); | |
854e8848 | 7574 | free_area_init_node(nid); |
37b07e41 LS |
7575 | |
7576 | /* Any memory on that node */ | |
7577 | if (pgdat->node_present_pages) | |
4b0ef1fe LJ |
7578 | node_set_state(nid, N_MEMORY); |
7579 | check_for_memory(pgdat, nid); | |
c713216d MG |
7580 | } |
7581 | } | |
2a1e274a | 7582 | |
a5c6d650 DR |
7583 | static int __init cmdline_parse_core(char *p, unsigned long *core, |
7584 | unsigned long *percent) | |
2a1e274a MG |
7585 | { |
7586 | unsigned long long coremem; | |
a5c6d650 DR |
7587 | char *endptr; |
7588 | ||
2a1e274a MG |
7589 | if (!p) |
7590 | return -EINVAL; | |
7591 | ||
a5c6d650 DR |
7592 | /* Value may be a percentage of total memory, otherwise bytes */ |
7593 | coremem = simple_strtoull(p, &endptr, 0); | |
7594 | if (*endptr == '%') { | |
7595 | /* Paranoid check for percent values greater than 100 */ | |
7596 | WARN_ON(coremem > 100); | |
2a1e274a | 7597 | |
a5c6d650 DR |
7598 | *percent = coremem; |
7599 | } else { | |
7600 | coremem = memparse(p, &p); | |
7601 | /* Paranoid check that UL is enough for the coremem value */ | |
7602 | WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX); | |
2a1e274a | 7603 | |
a5c6d650 DR |
7604 | *core = coremem >> PAGE_SHIFT; |
7605 | *percent = 0UL; | |
7606 | } | |
2a1e274a MG |
7607 | return 0; |
7608 | } | |
ed7ed365 | 7609 | |
7e63efef MG |
7610 | /* |
7611 | * kernelcore=size sets the amount of memory for use for allocations that | |
7612 | * cannot be reclaimed or migrated. | |
7613 | */ | |
7614 | static int __init cmdline_parse_kernelcore(char *p) | |
7615 | { | |
342332e6 TI |
7616 | /* parse kernelcore=mirror */ |
7617 | if (parse_option_str(p, "mirror")) { | |
7618 | mirrored_kernelcore = true; | |
7619 | return 0; | |
7620 | } | |
7621 | ||
a5c6d650 DR |
7622 | return cmdline_parse_core(p, &required_kernelcore, |
7623 | &required_kernelcore_percent); | |
7e63efef MG |
7624 | } |
7625 | ||
7626 | /* | |
7627 | * movablecore=size sets the amount of memory for use for allocations that | |
7628 | * can be reclaimed or migrated. | |
7629 | */ | |
7630 | static int __init cmdline_parse_movablecore(char *p) | |
7631 | { | |
a5c6d650 DR |
7632 | return cmdline_parse_core(p, &required_movablecore, |
7633 | &required_movablecore_percent); | |
7e63efef MG |
7634 | } |
7635 | ||
ed7ed365 | 7636 | early_param("kernelcore", cmdline_parse_kernelcore); |
7e63efef | 7637 | early_param("movablecore", cmdline_parse_movablecore); |
ed7ed365 | 7638 | |
c3d5f5f0 JL |
7639 | void adjust_managed_page_count(struct page *page, long count) |
7640 | { | |
9705bea5 | 7641 | atomic_long_add(count, &page_zone(page)->managed_pages); |
ca79b0c2 | 7642 | totalram_pages_add(count); |
3dcc0571 JL |
7643 | #ifdef CONFIG_HIGHMEM |
7644 | if (PageHighMem(page)) | |
ca79b0c2 | 7645 | totalhigh_pages_add(count); |
3dcc0571 | 7646 | #endif |
c3d5f5f0 | 7647 | } |
3dcc0571 | 7648 | EXPORT_SYMBOL(adjust_managed_page_count); |
c3d5f5f0 | 7649 | |
e5cb113f | 7650 | unsigned long free_reserved_area(void *start, void *end, int poison, const char *s) |
69afade7 | 7651 | { |
11199692 JL |
7652 | void *pos; |
7653 | unsigned long pages = 0; | |
69afade7 | 7654 | |
11199692 JL |
7655 | start = (void *)PAGE_ALIGN((unsigned long)start); |
7656 | end = (void *)((unsigned long)end & PAGE_MASK); | |
7657 | for (pos = start; pos < end; pos += PAGE_SIZE, pages++) { | |
0d834328 DH |
7658 | struct page *page = virt_to_page(pos); |
7659 | void *direct_map_addr; | |
7660 | ||
7661 | /* | |
7662 | * 'direct_map_addr' might be different from 'pos' | |
7663 | * because some architectures' virt_to_page() | |
7664 | * work with aliases. Getting the direct map | |
7665 | * address ensures that we get a _writeable_ | |
7666 | * alias for the memset(). | |
7667 | */ | |
7668 | direct_map_addr = page_address(page); | |
c746170d VF |
7669 | /* |
7670 | * Perform a kasan-unchecked memset() since this memory | |
7671 | * has not been initialized. | |
7672 | */ | |
7673 | direct_map_addr = kasan_reset_tag(direct_map_addr); | |
dbe67df4 | 7674 | if ((unsigned int)poison <= 0xFF) |
0d834328 DH |
7675 | memset(direct_map_addr, poison, PAGE_SIZE); |
7676 | ||
7677 | free_reserved_page(page); | |
69afade7 JL |
7678 | } |
7679 | ||
7680 | if (pages && s) | |
adb1fe9a JP |
7681 | pr_info("Freeing %s memory: %ldK\n", |
7682 | s, pages << (PAGE_SHIFT - 10)); | |
69afade7 JL |
7683 | |
7684 | return pages; | |
7685 | } | |
7686 | ||
cfa11e08 JL |
7687 | #ifdef CONFIG_HIGHMEM |
7688 | void free_highmem_page(struct page *page) | |
7689 | { | |
7690 | __free_reserved_page(page); | |
ca79b0c2 | 7691 | totalram_pages_inc(); |
9705bea5 | 7692 | atomic_long_inc(&page_zone(page)->managed_pages); |
ca79b0c2 | 7693 | totalhigh_pages_inc(); |
cfa11e08 JL |
7694 | } |
7695 | #endif | |
7696 | ||
7ee3d4e8 JL |
7697 | |
7698 | void __init mem_init_print_info(const char *str) | |
7699 | { | |
7700 | unsigned long physpages, codesize, datasize, rosize, bss_size; | |
7701 | unsigned long init_code_size, init_data_size; | |
7702 | ||
7703 | physpages = get_num_physpages(); | |
7704 | codesize = _etext - _stext; | |
7705 | datasize = _edata - _sdata; | |
7706 | rosize = __end_rodata - __start_rodata; | |
7707 | bss_size = __bss_stop - __bss_start; | |
7708 | init_data_size = __init_end - __init_begin; | |
7709 | init_code_size = _einittext - _sinittext; | |
7710 | ||
7711 | /* | |
7712 | * Detect special cases and adjust section sizes accordingly: | |
7713 | * 1) .init.* may be embedded into .data sections | |
7714 | * 2) .init.text.* may be out of [__init_begin, __init_end], | |
7715 | * please refer to arch/tile/kernel/vmlinux.lds.S. | |
7716 | * 3) .rodata.* may be embedded into .text or .data sections. | |
7717 | */ | |
7718 | #define adj_init_size(start, end, size, pos, adj) \ | |
b8af2941 PK |
7719 | do { \ |
7720 | if (start <= pos && pos < end && size > adj) \ | |
7721 | size -= adj; \ | |
7722 | } while (0) | |
7ee3d4e8 JL |
7723 | |
7724 | adj_init_size(__init_begin, __init_end, init_data_size, | |
7725 | _sinittext, init_code_size); | |
7726 | adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size); | |
7727 | adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size); | |
7728 | adj_init_size(_stext, _etext, codesize, __start_rodata, rosize); | |
7729 | adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize); | |
7730 | ||
7731 | #undef adj_init_size | |
7732 | ||
756a025f | 7733 | pr_info("Memory: %luK/%luK available (%luK kernel code, %luK rwdata, %luK rodata, %luK init, %luK bss, %luK reserved, %luK cma-reserved" |
7ee3d4e8 | 7734 | #ifdef CONFIG_HIGHMEM |
756a025f | 7735 | ", %luK highmem" |
7ee3d4e8 | 7736 | #endif |
756a025f JP |
7737 | "%s%s)\n", |
7738 | nr_free_pages() << (PAGE_SHIFT - 10), | |
7739 | physpages << (PAGE_SHIFT - 10), | |
7740 | codesize >> 10, datasize >> 10, rosize >> 10, | |
7741 | (init_data_size + init_code_size) >> 10, bss_size >> 10, | |
ca79b0c2 | 7742 | (physpages - totalram_pages() - totalcma_pages) << (PAGE_SHIFT - 10), |
756a025f | 7743 | totalcma_pages << (PAGE_SHIFT - 10), |
7ee3d4e8 | 7744 | #ifdef CONFIG_HIGHMEM |
ca79b0c2 | 7745 | totalhigh_pages() << (PAGE_SHIFT - 10), |
7ee3d4e8 | 7746 | #endif |
756a025f | 7747 | str ? ", " : "", str ? str : ""); |
7ee3d4e8 JL |
7748 | } |
7749 | ||
0e0b864e | 7750 | /** |
88ca3b94 RD |
7751 | * set_dma_reserve - set the specified number of pages reserved in the first zone |
7752 | * @new_dma_reserve: The number of pages to mark reserved | |
0e0b864e | 7753 | * |
013110a7 | 7754 | * The per-cpu batchsize and zone watermarks are determined by managed_pages. |
0e0b864e MG |
7755 | * In the DMA zone, a significant percentage may be consumed by kernel image |
7756 | * and other unfreeable allocations which can skew the watermarks badly. This | |
88ca3b94 RD |
7757 | * function may optionally be used to account for unfreeable pages in the |
7758 | * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and | |
7759 | * smaller per-cpu batchsize. | |
0e0b864e MG |
7760 | */ |
7761 | void __init set_dma_reserve(unsigned long new_dma_reserve) | |
7762 | { | |
7763 | dma_reserve = new_dma_reserve; | |
7764 | } | |
7765 | ||
005fd4bb | 7766 | static int page_alloc_cpu_dead(unsigned int cpu) |
1da177e4 | 7767 | { |
1da177e4 | 7768 | |
005fd4bb SAS |
7769 | lru_add_drain_cpu(cpu); |
7770 | drain_pages(cpu); | |
9f8f2172 | 7771 | |
005fd4bb SAS |
7772 | /* |
7773 | * Spill the event counters of the dead processor | |
7774 | * into the current processors event counters. | |
7775 | * This artificially elevates the count of the current | |
7776 | * processor. | |
7777 | */ | |
7778 | vm_events_fold_cpu(cpu); | |
9f8f2172 | 7779 | |
005fd4bb SAS |
7780 | /* |
7781 | * Zero the differential counters of the dead processor | |
7782 | * so that the vm statistics are consistent. | |
7783 | * | |
7784 | * This is only okay since the processor is dead and cannot | |
7785 | * race with what we are doing. | |
7786 | */ | |
7787 | cpu_vm_stats_fold(cpu); | |
7788 | return 0; | |
1da177e4 | 7789 | } |
1da177e4 | 7790 | |
e03a5125 NP |
7791 | #ifdef CONFIG_NUMA |
7792 | int hashdist = HASHDIST_DEFAULT; | |
7793 | ||
7794 | static int __init set_hashdist(char *str) | |
7795 | { | |
7796 | if (!str) | |
7797 | return 0; | |
7798 | hashdist = simple_strtoul(str, &str, 0); | |
7799 | return 1; | |
7800 | } | |
7801 | __setup("hashdist=", set_hashdist); | |
7802 | #endif | |
7803 | ||
1da177e4 LT |
7804 | void __init page_alloc_init(void) |
7805 | { | |
005fd4bb SAS |
7806 | int ret; |
7807 | ||
e03a5125 NP |
7808 | #ifdef CONFIG_NUMA |
7809 | if (num_node_state(N_MEMORY) == 1) | |
7810 | hashdist = 0; | |
7811 | #endif | |
7812 | ||
005fd4bb SAS |
7813 | ret = cpuhp_setup_state_nocalls(CPUHP_PAGE_ALLOC_DEAD, |
7814 | "mm/page_alloc:dead", NULL, | |
7815 | page_alloc_cpu_dead); | |
7816 | WARN_ON(ret < 0); | |
1da177e4 LT |
7817 | } |
7818 | ||
cb45b0e9 | 7819 | /* |
34b10060 | 7820 | * calculate_totalreserve_pages - called when sysctl_lowmem_reserve_ratio |
cb45b0e9 HA |
7821 | * or min_free_kbytes changes. |
7822 | */ | |
7823 | static void calculate_totalreserve_pages(void) | |
7824 | { | |
7825 | struct pglist_data *pgdat; | |
7826 | unsigned long reserve_pages = 0; | |
2f6726e5 | 7827 | enum zone_type i, j; |
cb45b0e9 HA |
7828 | |
7829 | for_each_online_pgdat(pgdat) { | |
281e3726 MG |
7830 | |
7831 | pgdat->totalreserve_pages = 0; | |
7832 | ||
cb45b0e9 HA |
7833 | for (i = 0; i < MAX_NR_ZONES; i++) { |
7834 | struct zone *zone = pgdat->node_zones + i; | |
3484b2de | 7835 | long max = 0; |
9705bea5 | 7836 | unsigned long managed_pages = zone_managed_pages(zone); |
cb45b0e9 HA |
7837 | |
7838 | /* Find valid and maximum lowmem_reserve in the zone */ | |
7839 | for (j = i; j < MAX_NR_ZONES; j++) { | |
7840 | if (zone->lowmem_reserve[j] > max) | |
7841 | max = zone->lowmem_reserve[j]; | |
7842 | } | |
7843 | ||
41858966 MG |
7844 | /* we treat the high watermark as reserved pages. */ |
7845 | max += high_wmark_pages(zone); | |
cb45b0e9 | 7846 | |
3d6357de AK |
7847 | if (max > managed_pages) |
7848 | max = managed_pages; | |
a8d01437 | 7849 | |
281e3726 | 7850 | pgdat->totalreserve_pages += max; |
a8d01437 | 7851 | |
cb45b0e9 HA |
7852 | reserve_pages += max; |
7853 | } | |
7854 | } | |
7855 | totalreserve_pages = reserve_pages; | |
7856 | } | |
7857 | ||
1da177e4 LT |
7858 | /* |
7859 | * setup_per_zone_lowmem_reserve - called whenever | |
34b10060 | 7860 | * sysctl_lowmem_reserve_ratio changes. Ensures that each zone |
1da177e4 LT |
7861 | * has a correct pages reserved value, so an adequate number of |
7862 | * pages are left in the zone after a successful __alloc_pages(). | |
7863 | */ | |
7864 | static void setup_per_zone_lowmem_reserve(void) | |
7865 | { | |
7866 | struct pglist_data *pgdat; | |
470c61d7 | 7867 | enum zone_type i, j; |
1da177e4 | 7868 | |
ec936fc5 | 7869 | for_each_online_pgdat(pgdat) { |
470c61d7 LS |
7870 | for (i = 0; i < MAX_NR_ZONES - 1; i++) { |
7871 | struct zone *zone = &pgdat->node_zones[i]; | |
7872 | int ratio = sysctl_lowmem_reserve_ratio[i]; | |
7873 | bool clear = !ratio || !zone_managed_pages(zone); | |
7874 | unsigned long managed_pages = 0; | |
7875 | ||
7876 | for (j = i + 1; j < MAX_NR_ZONES; j++) { | |
7877 | if (clear) { | |
7878 | zone->lowmem_reserve[j] = 0; | |
d3cda233 | 7879 | } else { |
470c61d7 LS |
7880 | struct zone *upper_zone = &pgdat->node_zones[j]; |
7881 | ||
7882 | managed_pages += zone_managed_pages(upper_zone); | |
7883 | zone->lowmem_reserve[j] = managed_pages / ratio; | |
d3cda233 | 7884 | } |
1da177e4 LT |
7885 | } |
7886 | } | |
7887 | } | |
cb45b0e9 HA |
7888 | |
7889 | /* update totalreserve_pages */ | |
7890 | calculate_totalreserve_pages(); | |
1da177e4 LT |
7891 | } |
7892 | ||
cfd3da1e | 7893 | static void __setup_per_zone_wmarks(void) |
1da177e4 LT |
7894 | { |
7895 | unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10); | |
7896 | unsigned long lowmem_pages = 0; | |
7897 | struct zone *zone; | |
7898 | unsigned long flags; | |
7899 | ||
7900 | /* Calculate total number of !ZONE_HIGHMEM pages */ | |
7901 | for_each_zone(zone) { | |
7902 | if (!is_highmem(zone)) | |
9705bea5 | 7903 | lowmem_pages += zone_managed_pages(zone); |
1da177e4 LT |
7904 | } |
7905 | ||
7906 | for_each_zone(zone) { | |
ac924c60 AM |
7907 | u64 tmp; |
7908 | ||
1125b4e3 | 7909 | spin_lock_irqsave(&zone->lock, flags); |
9705bea5 | 7910 | tmp = (u64)pages_min * zone_managed_pages(zone); |
ac924c60 | 7911 | do_div(tmp, lowmem_pages); |
1da177e4 LT |
7912 | if (is_highmem(zone)) { |
7913 | /* | |
669ed175 NP |
7914 | * __GFP_HIGH and PF_MEMALLOC allocations usually don't |
7915 | * need highmem pages, so cap pages_min to a small | |
7916 | * value here. | |
7917 | * | |
41858966 | 7918 | * The WMARK_HIGH-WMARK_LOW and (WMARK_LOW-WMARK_MIN) |
8bb4e7a2 | 7919 | * deltas control async page reclaim, and so should |
669ed175 | 7920 | * not be capped for highmem. |
1da177e4 | 7921 | */ |
90ae8d67 | 7922 | unsigned long min_pages; |
1da177e4 | 7923 | |
9705bea5 | 7924 | min_pages = zone_managed_pages(zone) / 1024; |
90ae8d67 | 7925 | min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL); |
a9214443 | 7926 | zone->_watermark[WMARK_MIN] = min_pages; |
1da177e4 | 7927 | } else { |
669ed175 NP |
7928 | /* |
7929 | * If it's a lowmem zone, reserve a number of pages | |
1da177e4 LT |
7930 | * proportionate to the zone's size. |
7931 | */ | |
a9214443 | 7932 | zone->_watermark[WMARK_MIN] = tmp; |
1da177e4 LT |
7933 | } |
7934 | ||
795ae7a0 JW |
7935 | /* |
7936 | * Set the kswapd watermarks distance according to the | |
7937 | * scale factor in proportion to available memory, but | |
7938 | * ensure a minimum size on small systems. | |
7939 | */ | |
7940 | tmp = max_t(u64, tmp >> 2, | |
9705bea5 | 7941 | mult_frac(zone_managed_pages(zone), |
795ae7a0 JW |
7942 | watermark_scale_factor, 10000)); |
7943 | ||
aa092591 | 7944 | zone->watermark_boost = 0; |
a9214443 MG |
7945 | zone->_watermark[WMARK_LOW] = min_wmark_pages(zone) + tmp; |
7946 | zone->_watermark[WMARK_HIGH] = min_wmark_pages(zone) + tmp * 2; | |
49f223a9 | 7947 | |
1125b4e3 | 7948 | spin_unlock_irqrestore(&zone->lock, flags); |
1da177e4 | 7949 | } |
cb45b0e9 HA |
7950 | |
7951 | /* update totalreserve_pages */ | |
7952 | calculate_totalreserve_pages(); | |
1da177e4 LT |
7953 | } |
7954 | ||
cfd3da1e MG |
7955 | /** |
7956 | * setup_per_zone_wmarks - called when min_free_kbytes changes | |
7957 | * or when memory is hot-{added|removed} | |
7958 | * | |
7959 | * Ensures that the watermark[min,low,high] values for each zone are set | |
7960 | * correctly with respect to min_free_kbytes. | |
7961 | */ | |
7962 | void setup_per_zone_wmarks(void) | |
7963 | { | |
b93e0f32 MH |
7964 | static DEFINE_SPINLOCK(lock); |
7965 | ||
7966 | spin_lock(&lock); | |
cfd3da1e | 7967 | __setup_per_zone_wmarks(); |
b93e0f32 | 7968 | spin_unlock(&lock); |
cfd3da1e MG |
7969 | } |
7970 | ||
1da177e4 LT |
7971 | /* |
7972 | * Initialise min_free_kbytes. | |
7973 | * | |
7974 | * For small machines we want it small (128k min). For large machines | |
8beeae86 | 7975 | * we want it large (256MB max). But it is not linear, because network |
1da177e4 LT |
7976 | * bandwidth does not increase linearly with machine size. We use |
7977 | * | |
b8af2941 | 7978 | * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: |
1da177e4 LT |
7979 | * min_free_kbytes = sqrt(lowmem_kbytes * 16) |
7980 | * | |
7981 | * which yields | |
7982 | * | |
7983 | * 16MB: 512k | |
7984 | * 32MB: 724k | |
7985 | * 64MB: 1024k | |
7986 | * 128MB: 1448k | |
7987 | * 256MB: 2048k | |
7988 | * 512MB: 2896k | |
7989 | * 1024MB: 4096k | |
7990 | * 2048MB: 5792k | |
7991 | * 4096MB: 8192k | |
7992 | * 8192MB: 11584k | |
7993 | * 16384MB: 16384k | |
7994 | */ | |
1b79acc9 | 7995 | int __meminit init_per_zone_wmark_min(void) |
1da177e4 LT |
7996 | { |
7997 | unsigned long lowmem_kbytes; | |
5f12733e | 7998 | int new_min_free_kbytes; |
1da177e4 LT |
7999 | |
8000 | lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); | |
5f12733e MH |
8001 | new_min_free_kbytes = int_sqrt(lowmem_kbytes * 16); |
8002 | ||
8003 | if (new_min_free_kbytes > user_min_free_kbytes) { | |
8004 | min_free_kbytes = new_min_free_kbytes; | |
8005 | if (min_free_kbytes < 128) | |
8006 | min_free_kbytes = 128; | |
ee8eb9a5 JS |
8007 | if (min_free_kbytes > 262144) |
8008 | min_free_kbytes = 262144; | |
5f12733e MH |
8009 | } else { |
8010 | pr_warn("min_free_kbytes is not updated to %d because user defined value %d is preferred\n", | |
8011 | new_min_free_kbytes, user_min_free_kbytes); | |
8012 | } | |
bc75d33f | 8013 | setup_per_zone_wmarks(); |
a6cccdc3 | 8014 | refresh_zone_stat_thresholds(); |
1da177e4 | 8015 | setup_per_zone_lowmem_reserve(); |
6423aa81 JK |
8016 | |
8017 | #ifdef CONFIG_NUMA | |
8018 | setup_min_unmapped_ratio(); | |
8019 | setup_min_slab_ratio(); | |
8020 | #endif | |
8021 | ||
4aab2be0 VB |
8022 | khugepaged_min_free_kbytes_update(); |
8023 | ||
1da177e4 LT |
8024 | return 0; |
8025 | } | |
e08d3fdf | 8026 | postcore_initcall(init_per_zone_wmark_min) |
1da177e4 LT |
8027 | |
8028 | /* | |
b8af2941 | 8029 | * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so |
1da177e4 LT |
8030 | * that we can call two helper functions whenever min_free_kbytes |
8031 | * changes. | |
8032 | */ | |
cccad5b9 | 8033 | int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write, |
32927393 | 8034 | void *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 8035 | { |
da8c757b HP |
8036 | int rc; |
8037 | ||
8038 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
8039 | if (rc) | |
8040 | return rc; | |
8041 | ||
5f12733e MH |
8042 | if (write) { |
8043 | user_min_free_kbytes = min_free_kbytes; | |
bc75d33f | 8044 | setup_per_zone_wmarks(); |
5f12733e | 8045 | } |
1da177e4 LT |
8046 | return 0; |
8047 | } | |
8048 | ||
795ae7a0 | 8049 | int watermark_scale_factor_sysctl_handler(struct ctl_table *table, int write, |
32927393 | 8050 | void *buffer, size_t *length, loff_t *ppos) |
795ae7a0 JW |
8051 | { |
8052 | int rc; | |
8053 | ||
8054 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
8055 | if (rc) | |
8056 | return rc; | |
8057 | ||
8058 | if (write) | |
8059 | setup_per_zone_wmarks(); | |
8060 | ||
8061 | return 0; | |
8062 | } | |
8063 | ||
9614634f | 8064 | #ifdef CONFIG_NUMA |
6423aa81 | 8065 | static void setup_min_unmapped_ratio(void) |
9614634f | 8066 | { |
6423aa81 | 8067 | pg_data_t *pgdat; |
9614634f | 8068 | struct zone *zone; |
9614634f | 8069 | |
a5f5f91d | 8070 | for_each_online_pgdat(pgdat) |
81cbcbc2 | 8071 | pgdat->min_unmapped_pages = 0; |
a5f5f91d | 8072 | |
9614634f | 8073 | for_each_zone(zone) |
9705bea5 AK |
8074 | zone->zone_pgdat->min_unmapped_pages += (zone_managed_pages(zone) * |
8075 | sysctl_min_unmapped_ratio) / 100; | |
9614634f | 8076 | } |
0ff38490 | 8077 | |
6423aa81 JK |
8078 | |
8079 | int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write, | |
32927393 | 8080 | void *buffer, size_t *length, loff_t *ppos) |
0ff38490 | 8081 | { |
0ff38490 CL |
8082 | int rc; |
8083 | ||
8d65af78 | 8084 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
0ff38490 CL |
8085 | if (rc) |
8086 | return rc; | |
8087 | ||
6423aa81 JK |
8088 | setup_min_unmapped_ratio(); |
8089 | ||
8090 | return 0; | |
8091 | } | |
8092 | ||
8093 | static void setup_min_slab_ratio(void) | |
8094 | { | |
8095 | pg_data_t *pgdat; | |
8096 | struct zone *zone; | |
8097 | ||
a5f5f91d MG |
8098 | for_each_online_pgdat(pgdat) |
8099 | pgdat->min_slab_pages = 0; | |
8100 | ||
0ff38490 | 8101 | for_each_zone(zone) |
9705bea5 AK |
8102 | zone->zone_pgdat->min_slab_pages += (zone_managed_pages(zone) * |
8103 | sysctl_min_slab_ratio) / 100; | |
6423aa81 JK |
8104 | } |
8105 | ||
8106 | int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write, | |
32927393 | 8107 | void *buffer, size_t *length, loff_t *ppos) |
6423aa81 JK |
8108 | { |
8109 | int rc; | |
8110 | ||
8111 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
8112 | if (rc) | |
8113 | return rc; | |
8114 | ||
8115 | setup_min_slab_ratio(); | |
8116 | ||
0ff38490 CL |
8117 | return 0; |
8118 | } | |
9614634f CL |
8119 | #endif |
8120 | ||
1da177e4 LT |
8121 | /* |
8122 | * lowmem_reserve_ratio_sysctl_handler - just a wrapper around | |
8123 | * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve() | |
8124 | * whenever sysctl_lowmem_reserve_ratio changes. | |
8125 | * | |
8126 | * The reserve ratio obviously has absolutely no relation with the | |
41858966 | 8127 | * minimum watermarks. The lowmem reserve ratio can only make sense |
1da177e4 LT |
8128 | * if in function of the boot time zone sizes. |
8129 | */ | |
cccad5b9 | 8130 | int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *table, int write, |
32927393 | 8131 | void *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 8132 | { |
86aaf255 BH |
8133 | int i; |
8134 | ||
8d65af78 | 8135 | proc_dointvec_minmax(table, write, buffer, length, ppos); |
86aaf255 BH |
8136 | |
8137 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
8138 | if (sysctl_lowmem_reserve_ratio[i] < 1) | |
8139 | sysctl_lowmem_reserve_ratio[i] = 0; | |
8140 | } | |
8141 | ||
1da177e4 LT |
8142 | setup_per_zone_lowmem_reserve(); |
8143 | return 0; | |
8144 | } | |
8145 | ||
8ad4b1fb RS |
8146 | /* |
8147 | * percpu_pagelist_fraction - changes the pcp->high for each zone on each | |
b8af2941 PK |
8148 | * cpu. It is the fraction of total pages in each zone that a hot per cpu |
8149 | * pagelist can have before it gets flushed back to buddy allocator. | |
8ad4b1fb | 8150 | */ |
cccad5b9 | 8151 | int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *table, int write, |
32927393 | 8152 | void *buffer, size_t *length, loff_t *ppos) |
8ad4b1fb RS |
8153 | { |
8154 | struct zone *zone; | |
7cd2b0a3 | 8155 | int old_percpu_pagelist_fraction; |
8ad4b1fb RS |
8156 | int ret; |
8157 | ||
7cd2b0a3 DR |
8158 | mutex_lock(&pcp_batch_high_lock); |
8159 | old_percpu_pagelist_fraction = percpu_pagelist_fraction; | |
8160 | ||
8d65af78 | 8161 | ret = proc_dointvec_minmax(table, write, buffer, length, ppos); |
7cd2b0a3 DR |
8162 | if (!write || ret < 0) |
8163 | goto out; | |
8164 | ||
8165 | /* Sanity checking to avoid pcp imbalance */ | |
8166 | if (percpu_pagelist_fraction && | |
8167 | percpu_pagelist_fraction < MIN_PERCPU_PAGELIST_FRACTION) { | |
8168 | percpu_pagelist_fraction = old_percpu_pagelist_fraction; | |
8169 | ret = -EINVAL; | |
8170 | goto out; | |
8171 | } | |
8172 | ||
8173 | /* No change? */ | |
8174 | if (percpu_pagelist_fraction == old_percpu_pagelist_fraction) | |
8175 | goto out; | |
c8e251fa | 8176 | |
cb1ef534 | 8177 | for_each_populated_zone(zone) |
0a8b4f1d | 8178 | zone_set_pageset_high_and_batch(zone); |
7cd2b0a3 | 8179 | out: |
c8e251fa | 8180 | mutex_unlock(&pcp_batch_high_lock); |
7cd2b0a3 | 8181 | return ret; |
8ad4b1fb RS |
8182 | } |
8183 | ||
f6f34b43 SD |
8184 | #ifndef __HAVE_ARCH_RESERVED_KERNEL_PAGES |
8185 | /* | |
8186 | * Returns the number of pages that arch has reserved but | |
8187 | * is not known to alloc_large_system_hash(). | |
8188 | */ | |
8189 | static unsigned long __init arch_reserved_kernel_pages(void) | |
8190 | { | |
8191 | return 0; | |
8192 | } | |
8193 | #endif | |
8194 | ||
9017217b PT |
8195 | /* |
8196 | * Adaptive scale is meant to reduce sizes of hash tables on large memory | |
8197 | * machines. As memory size is increased the scale is also increased but at | |
8198 | * slower pace. Starting from ADAPT_SCALE_BASE (64G), every time memory | |
8199 | * quadruples the scale is increased by one, which means the size of hash table | |
8200 | * only doubles, instead of quadrupling as well. | |
8201 | * Because 32-bit systems cannot have large physical memory, where this scaling | |
8202 | * makes sense, it is disabled on such platforms. | |
8203 | */ | |
8204 | #if __BITS_PER_LONG > 32 | |
8205 | #define ADAPT_SCALE_BASE (64ul << 30) | |
8206 | #define ADAPT_SCALE_SHIFT 2 | |
8207 | #define ADAPT_SCALE_NPAGES (ADAPT_SCALE_BASE >> PAGE_SHIFT) | |
8208 | #endif | |
8209 | ||
1da177e4 LT |
8210 | /* |
8211 | * allocate a large system hash table from bootmem | |
8212 | * - it is assumed that the hash table must contain an exact power-of-2 | |
8213 | * quantity of entries | |
8214 | * - limit is the number of hash buckets, not the total allocation size | |
8215 | */ | |
8216 | void *__init alloc_large_system_hash(const char *tablename, | |
8217 | unsigned long bucketsize, | |
8218 | unsigned long numentries, | |
8219 | int scale, | |
8220 | int flags, | |
8221 | unsigned int *_hash_shift, | |
8222 | unsigned int *_hash_mask, | |
31fe62b9 TB |
8223 | unsigned long low_limit, |
8224 | unsigned long high_limit) | |
1da177e4 | 8225 | { |
31fe62b9 | 8226 | unsigned long long max = high_limit; |
1da177e4 LT |
8227 | unsigned long log2qty, size; |
8228 | void *table = NULL; | |
3749a8f0 | 8229 | gfp_t gfp_flags; |
ec11408a | 8230 | bool virt; |
1da177e4 LT |
8231 | |
8232 | /* allow the kernel cmdline to have a say */ | |
8233 | if (!numentries) { | |
8234 | /* round applicable memory size up to nearest megabyte */ | |
04903664 | 8235 | numentries = nr_kernel_pages; |
f6f34b43 | 8236 | numentries -= arch_reserved_kernel_pages(); |
a7e83318 JZ |
8237 | |
8238 | /* It isn't necessary when PAGE_SIZE >= 1MB */ | |
8239 | if (PAGE_SHIFT < 20) | |
8240 | numentries = round_up(numentries, (1<<20)/PAGE_SIZE); | |
1da177e4 | 8241 | |
9017217b PT |
8242 | #if __BITS_PER_LONG > 32 |
8243 | if (!high_limit) { | |
8244 | unsigned long adapt; | |
8245 | ||
8246 | for (adapt = ADAPT_SCALE_NPAGES; adapt < numentries; | |
8247 | adapt <<= ADAPT_SCALE_SHIFT) | |
8248 | scale++; | |
8249 | } | |
8250 | #endif | |
8251 | ||
1da177e4 LT |
8252 | /* limit to 1 bucket per 2^scale bytes of low memory */ |
8253 | if (scale > PAGE_SHIFT) | |
8254 | numentries >>= (scale - PAGE_SHIFT); | |
8255 | else | |
8256 | numentries <<= (PAGE_SHIFT - scale); | |
9ab37b8f PM |
8257 | |
8258 | /* Make sure we've got at least a 0-order allocation.. */ | |
2c85f51d JB |
8259 | if (unlikely(flags & HASH_SMALL)) { |
8260 | /* Makes no sense without HASH_EARLY */ | |
8261 | WARN_ON(!(flags & HASH_EARLY)); | |
8262 | if (!(numentries >> *_hash_shift)) { | |
8263 | numentries = 1UL << *_hash_shift; | |
8264 | BUG_ON(!numentries); | |
8265 | } | |
8266 | } else if (unlikely((numentries * bucketsize) < PAGE_SIZE)) | |
9ab37b8f | 8267 | numentries = PAGE_SIZE / bucketsize; |
1da177e4 | 8268 | } |
6e692ed3 | 8269 | numentries = roundup_pow_of_two(numentries); |
1da177e4 LT |
8270 | |
8271 | /* limit allocation size to 1/16 total memory by default */ | |
8272 | if (max == 0) { | |
8273 | max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4; | |
8274 | do_div(max, bucketsize); | |
8275 | } | |
074b8517 | 8276 | max = min(max, 0x80000000ULL); |
1da177e4 | 8277 | |
31fe62b9 TB |
8278 | if (numentries < low_limit) |
8279 | numentries = low_limit; | |
1da177e4 LT |
8280 | if (numentries > max) |
8281 | numentries = max; | |
8282 | ||
f0d1b0b3 | 8283 | log2qty = ilog2(numentries); |
1da177e4 | 8284 | |
3749a8f0 | 8285 | gfp_flags = (flags & HASH_ZERO) ? GFP_ATOMIC | __GFP_ZERO : GFP_ATOMIC; |
1da177e4 | 8286 | do { |
ec11408a | 8287 | virt = false; |
1da177e4 | 8288 | size = bucketsize << log2qty; |
ea1f5f37 PT |
8289 | if (flags & HASH_EARLY) { |
8290 | if (flags & HASH_ZERO) | |
26fb3dae | 8291 | table = memblock_alloc(size, SMP_CACHE_BYTES); |
ea1f5f37 | 8292 | else |
7e1c4e27 MR |
8293 | table = memblock_alloc_raw(size, |
8294 | SMP_CACHE_BYTES); | |
ec11408a | 8295 | } else if (get_order(size) >= MAX_ORDER || hashdist) { |
88dca4ca | 8296 | table = __vmalloc(size, gfp_flags); |
ec11408a | 8297 | virt = true; |
ea1f5f37 | 8298 | } else { |
1037b83b ED |
8299 | /* |
8300 | * If bucketsize is not a power-of-two, we may free | |
a1dd268c MG |
8301 | * some pages at the end of hash table which |
8302 | * alloc_pages_exact() automatically does | |
1037b83b | 8303 | */ |
ec11408a NP |
8304 | table = alloc_pages_exact(size, gfp_flags); |
8305 | kmemleak_alloc(table, size, 1, gfp_flags); | |
1da177e4 LT |
8306 | } |
8307 | } while (!table && size > PAGE_SIZE && --log2qty); | |
8308 | ||
8309 | if (!table) | |
8310 | panic("Failed to allocate %s hash table\n", tablename); | |
8311 | ||
ec11408a NP |
8312 | pr_info("%s hash table entries: %ld (order: %d, %lu bytes, %s)\n", |
8313 | tablename, 1UL << log2qty, ilog2(size) - PAGE_SHIFT, size, | |
8314 | virt ? "vmalloc" : "linear"); | |
1da177e4 LT |
8315 | |
8316 | if (_hash_shift) | |
8317 | *_hash_shift = log2qty; | |
8318 | if (_hash_mask) | |
8319 | *_hash_mask = (1 << log2qty) - 1; | |
8320 | ||
8321 | return table; | |
8322 | } | |
a117e66e | 8323 | |
a5d76b54 | 8324 | /* |
80934513 | 8325 | * This function checks whether pageblock includes unmovable pages or not. |
80934513 | 8326 | * |
b8af2941 | 8327 | * PageLRU check without isolation or lru_lock could race so that |
0efadf48 YX |
8328 | * MIGRATE_MOVABLE block might include unmovable pages. And __PageMovable |
8329 | * check without lock_page also may miss some movable non-lru pages at | |
8330 | * race condition. So you can't expect this function should be exact. | |
4a55c047 QC |
8331 | * |
8332 | * Returns a page without holding a reference. If the caller wants to | |
047b9967 | 8333 | * dereference that page (e.g., dumping), it has to make sure that it |
4a55c047 QC |
8334 | * cannot get removed (e.g., via memory unplug) concurrently. |
8335 | * | |
a5d76b54 | 8336 | */ |
4a55c047 QC |
8337 | struct page *has_unmovable_pages(struct zone *zone, struct page *page, |
8338 | int migratetype, int flags) | |
49ac8255 | 8339 | { |
1a9f2191 QC |
8340 | unsigned long iter = 0; |
8341 | unsigned long pfn = page_to_pfn(page); | |
6a654e36 | 8342 | unsigned long offset = pfn % pageblock_nr_pages; |
47118af0 | 8343 | |
1a9f2191 QC |
8344 | if (is_migrate_cma_page(page)) { |
8345 | /* | |
8346 | * CMA allocations (alloc_contig_range) really need to mark | |
8347 | * isolate CMA pageblocks even when they are not movable in fact | |
8348 | * so consider them movable here. | |
8349 | */ | |
8350 | if (is_migrate_cma(migratetype)) | |
4a55c047 | 8351 | return NULL; |
1a9f2191 | 8352 | |
3d680bdf | 8353 | return page; |
1a9f2191 | 8354 | } |
4da2ce25 | 8355 | |
6a654e36 | 8356 | for (; iter < pageblock_nr_pages - offset; iter++) { |
fe4c86c9 | 8357 | if (!pfn_valid_within(pfn + iter)) |
49ac8255 | 8358 | continue; |
29723fcc | 8359 | |
fe4c86c9 | 8360 | page = pfn_to_page(pfn + iter); |
c8721bbb | 8361 | |
c9c510dc DH |
8362 | /* |
8363 | * Both, bootmem allocations and memory holes are marked | |
8364 | * PG_reserved and are unmovable. We can even have unmovable | |
8365 | * allocations inside ZONE_MOVABLE, for example when | |
8366 | * specifying "movablecore". | |
8367 | */ | |
d7ab3672 | 8368 | if (PageReserved(page)) |
3d680bdf | 8369 | return page; |
d7ab3672 | 8370 | |
9d789999 MH |
8371 | /* |
8372 | * If the zone is movable and we have ruled out all reserved | |
8373 | * pages then it should be reasonably safe to assume the rest | |
8374 | * is movable. | |
8375 | */ | |
8376 | if (zone_idx(zone) == ZONE_MOVABLE) | |
8377 | continue; | |
8378 | ||
c8721bbb NH |
8379 | /* |
8380 | * Hugepages are not in LRU lists, but they're movable. | |
1da2f328 | 8381 | * THPs are on the LRU, but need to be counted as #small pages. |
8bb4e7a2 | 8382 | * We need not scan over tail pages because we don't |
c8721bbb NH |
8383 | * handle each tail page individually in migration. |
8384 | */ | |
1da2f328 | 8385 | if (PageHuge(page) || PageTransCompound(page)) { |
17e2e7d7 OS |
8386 | struct page *head = compound_head(page); |
8387 | unsigned int skip_pages; | |
464c7ffb | 8388 | |
1da2f328 RR |
8389 | if (PageHuge(page)) { |
8390 | if (!hugepage_migration_supported(page_hstate(head))) | |
8391 | return page; | |
8392 | } else if (!PageLRU(head) && !__PageMovable(head)) { | |
3d680bdf | 8393 | return page; |
1da2f328 | 8394 | } |
464c7ffb | 8395 | |
d8c6546b | 8396 | skip_pages = compound_nr(head) - (page - head); |
17e2e7d7 | 8397 | iter += skip_pages - 1; |
c8721bbb NH |
8398 | continue; |
8399 | } | |
8400 | ||
97d255c8 MK |
8401 | /* |
8402 | * We can't use page_count without pin a page | |
8403 | * because another CPU can free compound page. | |
8404 | * This check already skips compound tails of THP | |
0139aa7b | 8405 | * because their page->_refcount is zero at all time. |
97d255c8 | 8406 | */ |
fe896d18 | 8407 | if (!page_ref_count(page)) { |
49ac8255 | 8408 | if (PageBuddy(page)) |
ab130f91 | 8409 | iter += (1 << buddy_order(page)) - 1; |
49ac8255 KH |
8410 | continue; |
8411 | } | |
97d255c8 | 8412 | |
b023f468 WC |
8413 | /* |
8414 | * The HWPoisoned page may be not in buddy system, and | |
8415 | * page_count() is not 0. | |
8416 | */ | |
756d25be | 8417 | if ((flags & MEMORY_OFFLINE) && PageHWPoison(page)) |
b023f468 WC |
8418 | continue; |
8419 | ||
aa218795 DH |
8420 | /* |
8421 | * We treat all PageOffline() pages as movable when offlining | |
8422 | * to give drivers a chance to decrement their reference count | |
8423 | * in MEM_GOING_OFFLINE in order to indicate that these pages | |
8424 | * can be offlined as there are no direct references anymore. | |
8425 | * For actually unmovable PageOffline() where the driver does | |
8426 | * not support this, we will fail later when trying to actually | |
8427 | * move these pages that still have a reference count > 0. | |
8428 | * (false negatives in this function only) | |
8429 | */ | |
8430 | if ((flags & MEMORY_OFFLINE) && PageOffline(page)) | |
8431 | continue; | |
8432 | ||
fe4c86c9 | 8433 | if (__PageMovable(page) || PageLRU(page)) |
0efadf48 YX |
8434 | continue; |
8435 | ||
49ac8255 | 8436 | /* |
6b4f7799 JW |
8437 | * If there are RECLAIMABLE pages, we need to check |
8438 | * it. But now, memory offline itself doesn't call | |
8439 | * shrink_node_slabs() and it still to be fixed. | |
49ac8255 | 8440 | */ |
3d680bdf | 8441 | return page; |
49ac8255 | 8442 | } |
4a55c047 | 8443 | return NULL; |
49ac8255 KH |
8444 | } |
8445 | ||
8df995f6 | 8446 | #ifdef CONFIG_CONTIG_ALLOC |
041d3a8c MN |
8447 | static unsigned long pfn_max_align_down(unsigned long pfn) |
8448 | { | |
8449 | return pfn & ~(max_t(unsigned long, MAX_ORDER_NR_PAGES, | |
8450 | pageblock_nr_pages) - 1); | |
8451 | } | |
8452 | ||
8453 | static unsigned long pfn_max_align_up(unsigned long pfn) | |
8454 | { | |
8455 | return ALIGN(pfn, max_t(unsigned long, MAX_ORDER_NR_PAGES, | |
8456 | pageblock_nr_pages)); | |
8457 | } | |
8458 | ||
041d3a8c | 8459 | /* [start, end) must belong to a single zone. */ |
bb13ffeb MG |
8460 | static int __alloc_contig_migrate_range(struct compact_control *cc, |
8461 | unsigned long start, unsigned long end) | |
041d3a8c MN |
8462 | { |
8463 | /* This function is based on compact_zone() from compaction.c. */ | |
730ec8c0 | 8464 | unsigned int nr_reclaimed; |
041d3a8c MN |
8465 | unsigned long pfn = start; |
8466 | unsigned int tries = 0; | |
8467 | int ret = 0; | |
8b94e0b8 JK |
8468 | struct migration_target_control mtc = { |
8469 | .nid = zone_to_nid(cc->zone), | |
8470 | .gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL, | |
8471 | }; | |
041d3a8c | 8472 | |
be49a6e1 | 8473 | migrate_prep(); |
041d3a8c | 8474 | |
bb13ffeb | 8475 | while (pfn < end || !list_empty(&cc->migratepages)) { |
041d3a8c MN |
8476 | if (fatal_signal_pending(current)) { |
8477 | ret = -EINTR; | |
8478 | break; | |
8479 | } | |
8480 | ||
bb13ffeb MG |
8481 | if (list_empty(&cc->migratepages)) { |
8482 | cc->nr_migratepages = 0; | |
edc2ca61 | 8483 | pfn = isolate_migratepages_range(cc, pfn, end); |
041d3a8c MN |
8484 | if (!pfn) { |
8485 | ret = -EINTR; | |
8486 | break; | |
8487 | } | |
8488 | tries = 0; | |
8489 | } else if (++tries == 5) { | |
8490 | ret = ret < 0 ? ret : -EBUSY; | |
8491 | break; | |
8492 | } | |
8493 | ||
beb51eaa MK |
8494 | nr_reclaimed = reclaim_clean_pages_from_list(cc->zone, |
8495 | &cc->migratepages); | |
8496 | cc->nr_migratepages -= nr_reclaimed; | |
02c6de8d | 8497 | |
8b94e0b8 JK |
8498 | ret = migrate_pages(&cc->migratepages, alloc_migration_target, |
8499 | NULL, (unsigned long)&mtc, cc->mode, MR_CONTIG_RANGE); | |
041d3a8c | 8500 | } |
2a6f5124 SP |
8501 | if (ret < 0) { |
8502 | putback_movable_pages(&cc->migratepages); | |
8503 | return ret; | |
8504 | } | |
8505 | return 0; | |
041d3a8c MN |
8506 | } |
8507 | ||
8508 | /** | |
8509 | * alloc_contig_range() -- tries to allocate given range of pages | |
8510 | * @start: start PFN to allocate | |
8511 | * @end: one-past-the-last PFN to allocate | |
0815f3d8 MN |
8512 | * @migratetype: migratetype of the underlaying pageblocks (either |
8513 | * #MIGRATE_MOVABLE or #MIGRATE_CMA). All pageblocks | |
8514 | * in range must have the same migratetype and it must | |
8515 | * be either of the two. | |
ca96b625 | 8516 | * @gfp_mask: GFP mask to use during compaction |
041d3a8c MN |
8517 | * |
8518 | * The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES | |
2c7452a0 | 8519 | * aligned. The PFN range must belong to a single zone. |
041d3a8c | 8520 | * |
2c7452a0 MK |
8521 | * The first thing this routine does is attempt to MIGRATE_ISOLATE all |
8522 | * pageblocks in the range. Once isolated, the pageblocks should not | |
8523 | * be modified by others. | |
041d3a8c | 8524 | * |
a862f68a | 8525 | * Return: zero on success or negative error code. On success all |
041d3a8c MN |
8526 | * pages which PFN is in [start, end) are allocated for the caller and |
8527 | * need to be freed with free_contig_range(). | |
8528 | */ | |
0815f3d8 | 8529 | int alloc_contig_range(unsigned long start, unsigned long end, |
ca96b625 | 8530 | unsigned migratetype, gfp_t gfp_mask) |
041d3a8c | 8531 | { |
041d3a8c | 8532 | unsigned long outer_start, outer_end; |
d00181b9 KS |
8533 | unsigned int order; |
8534 | int ret = 0; | |
041d3a8c | 8535 | |
bb13ffeb MG |
8536 | struct compact_control cc = { |
8537 | .nr_migratepages = 0, | |
8538 | .order = -1, | |
8539 | .zone = page_zone(pfn_to_page(start)), | |
e0b9daeb | 8540 | .mode = MIGRATE_SYNC, |
bb13ffeb | 8541 | .ignore_skip_hint = true, |
2583d671 | 8542 | .no_set_skip_hint = true, |
7dea19f9 | 8543 | .gfp_mask = current_gfp_context(gfp_mask), |
b06eda09 | 8544 | .alloc_contig = true, |
bb13ffeb MG |
8545 | }; |
8546 | INIT_LIST_HEAD(&cc.migratepages); | |
8547 | ||
041d3a8c MN |
8548 | /* |
8549 | * What we do here is we mark all pageblocks in range as | |
8550 | * MIGRATE_ISOLATE. Because pageblock and max order pages may | |
8551 | * have different sizes, and due to the way page allocator | |
8552 | * work, we align the range to biggest of the two pages so | |
8553 | * that page allocator won't try to merge buddies from | |
8554 | * different pageblocks and change MIGRATE_ISOLATE to some | |
8555 | * other migration type. | |
8556 | * | |
8557 | * Once the pageblocks are marked as MIGRATE_ISOLATE, we | |
8558 | * migrate the pages from an unaligned range (ie. pages that | |
8559 | * we are interested in). This will put all the pages in | |
8560 | * range back to page allocator as MIGRATE_ISOLATE. | |
8561 | * | |
8562 | * When this is done, we take the pages in range from page | |
8563 | * allocator removing them from the buddy system. This way | |
8564 | * page allocator will never consider using them. | |
8565 | * | |
8566 | * This lets us mark the pageblocks back as | |
8567 | * MIGRATE_CMA/MIGRATE_MOVABLE so that free pages in the | |
8568 | * aligned range but not in the unaligned, original range are | |
8569 | * put back to page allocator so that buddy can use them. | |
8570 | */ | |
8571 | ||
8572 | ret = start_isolate_page_range(pfn_max_align_down(start), | |
d381c547 | 8573 | pfn_max_align_up(end), migratetype, 0); |
3fa0c7c7 | 8574 | if (ret) |
86a595f9 | 8575 | return ret; |
041d3a8c | 8576 | |
7612921f VB |
8577 | drain_all_pages(cc.zone); |
8578 | ||
8ef5849f JK |
8579 | /* |
8580 | * In case of -EBUSY, we'd like to know which page causes problem. | |
63cd4489 MK |
8581 | * So, just fall through. test_pages_isolated() has a tracepoint |
8582 | * which will report the busy page. | |
8583 | * | |
8584 | * It is possible that busy pages could become available before | |
8585 | * the call to test_pages_isolated, and the range will actually be | |
8586 | * allocated. So, if we fall through be sure to clear ret so that | |
8587 | * -EBUSY is not accidentally used or returned to caller. | |
8ef5849f | 8588 | */ |
bb13ffeb | 8589 | ret = __alloc_contig_migrate_range(&cc, start, end); |
8ef5849f | 8590 | if (ret && ret != -EBUSY) |
041d3a8c | 8591 | goto done; |
63cd4489 | 8592 | ret =0; |
041d3a8c MN |
8593 | |
8594 | /* | |
8595 | * Pages from [start, end) are within a MAX_ORDER_NR_PAGES | |
8596 | * aligned blocks that are marked as MIGRATE_ISOLATE. What's | |
8597 | * more, all pages in [start, end) are free in page allocator. | |
8598 | * What we are going to do is to allocate all pages from | |
8599 | * [start, end) (that is remove them from page allocator). | |
8600 | * | |
8601 | * The only problem is that pages at the beginning and at the | |
8602 | * end of interesting range may be not aligned with pages that | |
8603 | * page allocator holds, ie. they can be part of higher order | |
8604 | * pages. Because of this, we reserve the bigger range and | |
8605 | * once this is done free the pages we are not interested in. | |
8606 | * | |
8607 | * We don't have to hold zone->lock here because the pages are | |
8608 | * isolated thus they won't get removed from buddy. | |
8609 | */ | |
8610 | ||
8611 | lru_add_drain_all(); | |
041d3a8c MN |
8612 | |
8613 | order = 0; | |
8614 | outer_start = start; | |
8615 | while (!PageBuddy(pfn_to_page(outer_start))) { | |
8616 | if (++order >= MAX_ORDER) { | |
8ef5849f JK |
8617 | outer_start = start; |
8618 | break; | |
041d3a8c MN |
8619 | } |
8620 | outer_start &= ~0UL << order; | |
8621 | } | |
8622 | ||
8ef5849f | 8623 | if (outer_start != start) { |
ab130f91 | 8624 | order = buddy_order(pfn_to_page(outer_start)); |
8ef5849f JK |
8625 | |
8626 | /* | |
8627 | * outer_start page could be small order buddy page and | |
8628 | * it doesn't include start page. Adjust outer_start | |
8629 | * in this case to report failed page properly | |
8630 | * on tracepoint in test_pages_isolated() | |
8631 | */ | |
8632 | if (outer_start + (1UL << order) <= start) | |
8633 | outer_start = start; | |
8634 | } | |
8635 | ||
041d3a8c | 8636 | /* Make sure the range is really isolated. */ |
756d25be | 8637 | if (test_pages_isolated(outer_start, end, 0)) { |
75dddef3 | 8638 | pr_info_ratelimited("%s: [%lx, %lx) PFNs busy\n", |
dae803e1 | 8639 | __func__, outer_start, end); |
041d3a8c MN |
8640 | ret = -EBUSY; |
8641 | goto done; | |
8642 | } | |
8643 | ||
49f223a9 | 8644 | /* Grab isolated pages from freelists. */ |
bb13ffeb | 8645 | outer_end = isolate_freepages_range(&cc, outer_start, end); |
041d3a8c MN |
8646 | if (!outer_end) { |
8647 | ret = -EBUSY; | |
8648 | goto done; | |
8649 | } | |
8650 | ||
8651 | /* Free head and tail (if any) */ | |
8652 | if (start != outer_start) | |
8653 | free_contig_range(outer_start, start - outer_start); | |
8654 | if (end != outer_end) | |
8655 | free_contig_range(end, outer_end - end); | |
8656 | ||
8657 | done: | |
8658 | undo_isolate_page_range(pfn_max_align_down(start), | |
0815f3d8 | 8659 | pfn_max_align_up(end), migratetype); |
041d3a8c MN |
8660 | return ret; |
8661 | } | |
255f5985 | 8662 | EXPORT_SYMBOL(alloc_contig_range); |
5e27a2df AK |
8663 | |
8664 | static int __alloc_contig_pages(unsigned long start_pfn, | |
8665 | unsigned long nr_pages, gfp_t gfp_mask) | |
8666 | { | |
8667 | unsigned long end_pfn = start_pfn + nr_pages; | |
8668 | ||
8669 | return alloc_contig_range(start_pfn, end_pfn, MIGRATE_MOVABLE, | |
8670 | gfp_mask); | |
8671 | } | |
8672 | ||
8673 | static bool pfn_range_valid_contig(struct zone *z, unsigned long start_pfn, | |
8674 | unsigned long nr_pages) | |
8675 | { | |
8676 | unsigned long i, end_pfn = start_pfn + nr_pages; | |
8677 | struct page *page; | |
8678 | ||
8679 | for (i = start_pfn; i < end_pfn; i++) { | |
8680 | page = pfn_to_online_page(i); | |
8681 | if (!page) | |
8682 | return false; | |
8683 | ||
8684 | if (page_zone(page) != z) | |
8685 | return false; | |
8686 | ||
8687 | if (PageReserved(page)) | |
8688 | return false; | |
8689 | ||
8690 | if (page_count(page) > 0) | |
8691 | return false; | |
8692 | ||
8693 | if (PageHuge(page)) | |
8694 | return false; | |
8695 | } | |
8696 | return true; | |
8697 | } | |
8698 | ||
8699 | static bool zone_spans_last_pfn(const struct zone *zone, | |
8700 | unsigned long start_pfn, unsigned long nr_pages) | |
8701 | { | |
8702 | unsigned long last_pfn = start_pfn + nr_pages - 1; | |
8703 | ||
8704 | return zone_spans_pfn(zone, last_pfn); | |
8705 | } | |
8706 | ||
8707 | /** | |
8708 | * alloc_contig_pages() -- tries to find and allocate contiguous range of pages | |
8709 | * @nr_pages: Number of contiguous pages to allocate | |
8710 | * @gfp_mask: GFP mask to limit search and used during compaction | |
8711 | * @nid: Target node | |
8712 | * @nodemask: Mask for other possible nodes | |
8713 | * | |
8714 | * This routine is a wrapper around alloc_contig_range(). It scans over zones | |
8715 | * on an applicable zonelist to find a contiguous pfn range which can then be | |
8716 | * tried for allocation with alloc_contig_range(). This routine is intended | |
8717 | * for allocation requests which can not be fulfilled with the buddy allocator. | |
8718 | * | |
8719 | * The allocated memory is always aligned to a page boundary. If nr_pages is a | |
8720 | * power of two then the alignment is guaranteed to be to the given nr_pages | |
8721 | * (e.g. 1GB request would be aligned to 1GB). | |
8722 | * | |
8723 | * Allocated pages can be freed with free_contig_range() or by manually calling | |
8724 | * __free_page() on each allocated page. | |
8725 | * | |
8726 | * Return: pointer to contiguous pages on success, or NULL if not successful. | |
8727 | */ | |
8728 | struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask, | |
8729 | int nid, nodemask_t *nodemask) | |
8730 | { | |
8731 | unsigned long ret, pfn, flags; | |
8732 | struct zonelist *zonelist; | |
8733 | struct zone *zone; | |
8734 | struct zoneref *z; | |
8735 | ||
8736 | zonelist = node_zonelist(nid, gfp_mask); | |
8737 | for_each_zone_zonelist_nodemask(zone, z, zonelist, | |
8738 | gfp_zone(gfp_mask), nodemask) { | |
8739 | spin_lock_irqsave(&zone->lock, flags); | |
8740 | ||
8741 | pfn = ALIGN(zone->zone_start_pfn, nr_pages); | |
8742 | while (zone_spans_last_pfn(zone, pfn, nr_pages)) { | |
8743 | if (pfn_range_valid_contig(zone, pfn, nr_pages)) { | |
8744 | /* | |
8745 | * We release the zone lock here because | |
8746 | * alloc_contig_range() will also lock the zone | |
8747 | * at some point. If there's an allocation | |
8748 | * spinning on this lock, it may win the race | |
8749 | * and cause alloc_contig_range() to fail... | |
8750 | */ | |
8751 | spin_unlock_irqrestore(&zone->lock, flags); | |
8752 | ret = __alloc_contig_pages(pfn, nr_pages, | |
8753 | gfp_mask); | |
8754 | if (!ret) | |
8755 | return pfn_to_page(pfn); | |
8756 | spin_lock_irqsave(&zone->lock, flags); | |
8757 | } | |
8758 | pfn += nr_pages; | |
8759 | } | |
8760 | spin_unlock_irqrestore(&zone->lock, flags); | |
8761 | } | |
8762 | return NULL; | |
8763 | } | |
4eb0716e | 8764 | #endif /* CONFIG_CONTIG_ALLOC */ |
041d3a8c | 8765 | |
4eb0716e | 8766 | void free_contig_range(unsigned long pfn, unsigned int nr_pages) |
041d3a8c | 8767 | { |
bcc2b02f MS |
8768 | unsigned int count = 0; |
8769 | ||
8770 | for (; nr_pages--; pfn++) { | |
8771 | struct page *page = pfn_to_page(pfn); | |
8772 | ||
8773 | count += page_count(page) != 1; | |
8774 | __free_page(page); | |
8775 | } | |
8776 | WARN(count != 0, "%d pages are still in use!\n", count); | |
041d3a8c | 8777 | } |
255f5985 | 8778 | EXPORT_SYMBOL(free_contig_range); |
041d3a8c | 8779 | |
0a647f38 CS |
8780 | /* |
8781 | * The zone indicated has a new number of managed_pages; batch sizes and percpu | |
8782 | * page high values need to be recalulated. | |
8783 | */ | |
4ed7e022 JL |
8784 | void __meminit zone_pcp_update(struct zone *zone) |
8785 | { | |
c8e251fa | 8786 | mutex_lock(&pcp_batch_high_lock); |
0a8b4f1d | 8787 | zone_set_pageset_high_and_batch(zone); |
c8e251fa | 8788 | mutex_unlock(&pcp_batch_high_lock); |
4ed7e022 | 8789 | } |
4ed7e022 | 8790 | |
ec6e8c7e VB |
8791 | /* |
8792 | * Effectively disable pcplists for the zone by setting the high limit to 0 | |
8793 | * and draining all cpus. A concurrent page freeing on another CPU that's about | |
8794 | * to put the page on pcplist will either finish before the drain and the page | |
8795 | * will be drained, or observe the new high limit and skip the pcplist. | |
8796 | * | |
8797 | * Must be paired with a call to zone_pcp_enable(). | |
8798 | */ | |
8799 | void zone_pcp_disable(struct zone *zone) | |
8800 | { | |
8801 | mutex_lock(&pcp_batch_high_lock); | |
8802 | __zone_set_pageset_high_and_batch(zone, 0, 1); | |
8803 | __drain_all_pages(zone, true); | |
8804 | } | |
8805 | ||
8806 | void zone_pcp_enable(struct zone *zone) | |
8807 | { | |
8808 | __zone_set_pageset_high_and_batch(zone, zone->pageset_high, zone->pageset_batch); | |
8809 | mutex_unlock(&pcp_batch_high_lock); | |
8810 | } | |
8811 | ||
340175b7 JL |
8812 | void zone_pcp_reset(struct zone *zone) |
8813 | { | |
8814 | unsigned long flags; | |
5a883813 MK |
8815 | int cpu; |
8816 | struct per_cpu_pageset *pset; | |
340175b7 JL |
8817 | |
8818 | /* avoid races with drain_pages() */ | |
8819 | local_irq_save(flags); | |
8820 | if (zone->pageset != &boot_pageset) { | |
5a883813 MK |
8821 | for_each_online_cpu(cpu) { |
8822 | pset = per_cpu_ptr(zone->pageset, cpu); | |
8823 | drain_zonestat(zone, pset); | |
8824 | } | |
340175b7 JL |
8825 | free_percpu(zone->pageset); |
8826 | zone->pageset = &boot_pageset; | |
8827 | } | |
8828 | local_irq_restore(flags); | |
8829 | } | |
8830 | ||
6dcd73d7 | 8831 | #ifdef CONFIG_MEMORY_HOTREMOVE |
0c0e6195 | 8832 | /* |
257bea71 DH |
8833 | * All pages in the range must be in a single zone, must not contain holes, |
8834 | * must span full sections, and must be isolated before calling this function. | |
0c0e6195 | 8835 | */ |
257bea71 | 8836 | void __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) |
0c0e6195 | 8837 | { |
257bea71 | 8838 | unsigned long pfn = start_pfn; |
0c0e6195 KH |
8839 | struct page *page; |
8840 | struct zone *zone; | |
0ee5f4f3 | 8841 | unsigned int order; |
0c0e6195 | 8842 | unsigned long flags; |
5557c766 | 8843 | |
2d070eab | 8844 | offline_mem_sections(pfn, end_pfn); |
0c0e6195 KH |
8845 | zone = page_zone(pfn_to_page(pfn)); |
8846 | spin_lock_irqsave(&zone->lock, flags); | |
0c0e6195 | 8847 | while (pfn < end_pfn) { |
0c0e6195 | 8848 | page = pfn_to_page(pfn); |
b023f468 WC |
8849 | /* |
8850 | * The HWPoisoned page may be not in buddy system, and | |
8851 | * page_count() is not 0. | |
8852 | */ | |
8853 | if (unlikely(!PageBuddy(page) && PageHWPoison(page))) { | |
8854 | pfn++; | |
b023f468 WC |
8855 | continue; |
8856 | } | |
aa218795 DH |
8857 | /* |
8858 | * At this point all remaining PageOffline() pages have a | |
8859 | * reference count of 0 and can simply be skipped. | |
8860 | */ | |
8861 | if (PageOffline(page)) { | |
8862 | BUG_ON(page_count(page)); | |
8863 | BUG_ON(PageBuddy(page)); | |
8864 | pfn++; | |
aa218795 DH |
8865 | continue; |
8866 | } | |
b023f468 | 8867 | |
0c0e6195 KH |
8868 | BUG_ON(page_count(page)); |
8869 | BUG_ON(!PageBuddy(page)); | |
ab130f91 | 8870 | order = buddy_order(page); |
6ab01363 | 8871 | del_page_from_free_list(page, zone, order); |
0c0e6195 KH |
8872 | pfn += (1 << order); |
8873 | } | |
8874 | spin_unlock_irqrestore(&zone->lock, flags); | |
8875 | } | |
8876 | #endif | |
8d22ba1b | 8877 | |
8d22ba1b WF |
8878 | bool is_free_buddy_page(struct page *page) |
8879 | { | |
8880 | struct zone *zone = page_zone(page); | |
8881 | unsigned long pfn = page_to_pfn(page); | |
8882 | unsigned long flags; | |
7aeb09f9 | 8883 | unsigned int order; |
8d22ba1b WF |
8884 | |
8885 | spin_lock_irqsave(&zone->lock, flags); | |
8886 | for (order = 0; order < MAX_ORDER; order++) { | |
8887 | struct page *page_head = page - (pfn & ((1 << order) - 1)); | |
8888 | ||
ab130f91 | 8889 | if (PageBuddy(page_head) && buddy_order(page_head) >= order) |
8d22ba1b WF |
8890 | break; |
8891 | } | |
8892 | spin_unlock_irqrestore(&zone->lock, flags); | |
8893 | ||
8894 | return order < MAX_ORDER; | |
8895 | } | |
d4ae9916 NH |
8896 | |
8897 | #ifdef CONFIG_MEMORY_FAILURE | |
8898 | /* | |
06be6ff3 OS |
8899 | * Break down a higher-order page in sub-pages, and keep our target out of |
8900 | * buddy allocator. | |
d4ae9916 | 8901 | */ |
06be6ff3 OS |
8902 | static void break_down_buddy_pages(struct zone *zone, struct page *page, |
8903 | struct page *target, int low, int high, | |
8904 | int migratetype) | |
8905 | { | |
8906 | unsigned long size = 1 << high; | |
8907 | struct page *current_buddy, *next_page; | |
8908 | ||
8909 | while (high > low) { | |
8910 | high--; | |
8911 | size >>= 1; | |
8912 | ||
8913 | if (target >= &page[size]) { | |
8914 | next_page = page + size; | |
8915 | current_buddy = page; | |
8916 | } else { | |
8917 | next_page = page; | |
8918 | current_buddy = page + size; | |
8919 | } | |
8920 | ||
8921 | if (set_page_guard(zone, current_buddy, high, migratetype)) | |
8922 | continue; | |
8923 | ||
8924 | if (current_buddy != target) { | |
8925 | add_to_free_list(current_buddy, zone, high, migratetype); | |
ab130f91 | 8926 | set_buddy_order(current_buddy, high); |
06be6ff3 OS |
8927 | page = next_page; |
8928 | } | |
8929 | } | |
8930 | } | |
8931 | ||
8932 | /* | |
8933 | * Take a page that will be marked as poisoned off the buddy allocator. | |
8934 | */ | |
8935 | bool take_page_off_buddy(struct page *page) | |
d4ae9916 NH |
8936 | { |
8937 | struct zone *zone = page_zone(page); | |
8938 | unsigned long pfn = page_to_pfn(page); | |
8939 | unsigned long flags; | |
8940 | unsigned int order; | |
06be6ff3 | 8941 | bool ret = false; |
d4ae9916 NH |
8942 | |
8943 | spin_lock_irqsave(&zone->lock, flags); | |
8944 | for (order = 0; order < MAX_ORDER; order++) { | |
8945 | struct page *page_head = page - (pfn & ((1 << order) - 1)); | |
ab130f91 | 8946 | int page_order = buddy_order(page_head); |
d4ae9916 | 8947 | |
ab130f91 | 8948 | if (PageBuddy(page_head) && page_order >= order) { |
06be6ff3 OS |
8949 | unsigned long pfn_head = page_to_pfn(page_head); |
8950 | int migratetype = get_pfnblock_migratetype(page_head, | |
8951 | pfn_head); | |
8952 | ||
ab130f91 | 8953 | del_page_from_free_list(page_head, zone, page_order); |
06be6ff3 | 8954 | break_down_buddy_pages(zone, page_head, page, 0, |
ab130f91 | 8955 | page_order, migratetype); |
ff3d095e DH |
8956 | if (!is_migrate_isolate(migratetype)) |
8957 | __mod_zone_freepage_state(zone, -1, migratetype); | |
06be6ff3 | 8958 | ret = true; |
d4ae9916 NH |
8959 | break; |
8960 | } | |
06be6ff3 OS |
8961 | if (page_count(page_head) > 0) |
8962 | break; | |
d4ae9916 NH |
8963 | } |
8964 | spin_unlock_irqrestore(&zone->lock, flags); | |
06be6ff3 | 8965 | return ret; |
d4ae9916 NH |
8966 | } |
8967 | #endif |