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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> |
041d3a8c | 60 | #include <linux/migrate.h> |
949f7ec5 | 61 | #include <linux/hugetlb.h> |
8bd75c77 | 62 | #include <linux/sched/rt.h> |
5b3cc15a | 63 | #include <linux/sched/mm.h> |
48c96a36 | 64 | #include <linux/page_owner.h> |
0e1cc95b | 65 | #include <linux/kthread.h> |
4949148a | 66 | #include <linux/memcontrol.h> |
42c269c8 | 67 | #include <linux/ftrace.h> |
d92a8cfc | 68 | #include <linux/lockdep.h> |
556b969a | 69 | #include <linux/nmi.h> |
eb414681 | 70 | #include <linux/psi.h> |
e4443149 | 71 | #include <linux/padata.h> |
1da177e4 | 72 | |
7ee3d4e8 | 73 | #include <asm/sections.h> |
1da177e4 | 74 | #include <asm/tlbflush.h> |
ac924c60 | 75 | #include <asm/div64.h> |
1da177e4 | 76 | #include "internal.h" |
e900a918 | 77 | #include "shuffle.h" |
36e66c55 | 78 | #include "page_reporting.h" |
1da177e4 | 79 | |
c8e251fa CS |
80 | /* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */ |
81 | static DEFINE_MUTEX(pcp_batch_high_lock); | |
7cd2b0a3 | 82 | #define MIN_PERCPU_PAGELIST_FRACTION (8) |
c8e251fa | 83 | |
72812019 LS |
84 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
85 | DEFINE_PER_CPU(int, numa_node); | |
86 | EXPORT_PER_CPU_SYMBOL(numa_node); | |
87 | #endif | |
88 | ||
4518085e KW |
89 | DEFINE_STATIC_KEY_TRUE(vm_numa_stat_key); |
90 | ||
7aac7898 LS |
91 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
92 | /* | |
93 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. | |
94 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. | |
95 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem() | |
96 | * defined in <linux/topology.h>. | |
97 | */ | |
98 | DEFINE_PER_CPU(int, _numa_mem_); /* Kernel "local memory" node */ | |
99 | EXPORT_PER_CPU_SYMBOL(_numa_mem_); | |
100 | #endif | |
101 | ||
bd233f53 | 102 | /* work_structs for global per-cpu drains */ |
d9367bd0 WY |
103 | struct pcpu_drain { |
104 | struct zone *zone; | |
105 | struct work_struct work; | |
106 | }; | |
8b885f53 JY |
107 | static DEFINE_MUTEX(pcpu_drain_mutex); |
108 | static DEFINE_PER_CPU(struct pcpu_drain, pcpu_drain); | |
bd233f53 | 109 | |
38addce8 | 110 | #ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY |
58bea414 | 111 | volatile unsigned long latent_entropy __latent_entropy; |
38addce8 ER |
112 | EXPORT_SYMBOL(latent_entropy); |
113 | #endif | |
114 | ||
1da177e4 | 115 | /* |
13808910 | 116 | * Array of node states. |
1da177e4 | 117 | */ |
13808910 CL |
118 | nodemask_t node_states[NR_NODE_STATES] __read_mostly = { |
119 | [N_POSSIBLE] = NODE_MASK_ALL, | |
120 | [N_ONLINE] = { { [0] = 1UL } }, | |
121 | #ifndef CONFIG_NUMA | |
122 | [N_NORMAL_MEMORY] = { { [0] = 1UL } }, | |
123 | #ifdef CONFIG_HIGHMEM | |
124 | [N_HIGH_MEMORY] = { { [0] = 1UL } }, | |
20b2f52b | 125 | #endif |
20b2f52b | 126 | [N_MEMORY] = { { [0] = 1UL } }, |
13808910 CL |
127 | [N_CPU] = { { [0] = 1UL } }, |
128 | #endif /* NUMA */ | |
129 | }; | |
130 | EXPORT_SYMBOL(node_states); | |
131 | ||
ca79b0c2 AK |
132 | atomic_long_t _totalram_pages __read_mostly; |
133 | EXPORT_SYMBOL(_totalram_pages); | |
cb45b0e9 | 134 | unsigned long totalreserve_pages __read_mostly; |
e48322ab | 135 | unsigned long totalcma_pages __read_mostly; |
ab8fabd4 | 136 | |
1b76b02f | 137 | int percpu_pagelist_fraction; |
dcce284a | 138 | gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK; |
6471384a AP |
139 | #ifdef CONFIG_INIT_ON_ALLOC_DEFAULT_ON |
140 | DEFINE_STATIC_KEY_TRUE(init_on_alloc); | |
141 | #else | |
142 | DEFINE_STATIC_KEY_FALSE(init_on_alloc); | |
143 | #endif | |
144 | EXPORT_SYMBOL(init_on_alloc); | |
145 | ||
146 | #ifdef CONFIG_INIT_ON_FREE_DEFAULT_ON | |
147 | DEFINE_STATIC_KEY_TRUE(init_on_free); | |
148 | #else | |
149 | DEFINE_STATIC_KEY_FALSE(init_on_free); | |
150 | #endif | |
151 | EXPORT_SYMBOL(init_on_free); | |
152 | ||
153 | static int __init early_init_on_alloc(char *buf) | |
154 | { | |
155 | int ret; | |
156 | bool bool_result; | |
157 | ||
158 | if (!buf) | |
159 | return -EINVAL; | |
160 | ret = kstrtobool(buf, &bool_result); | |
161 | if (bool_result && page_poisoning_enabled()) | |
162 | pr_info("mem auto-init: CONFIG_PAGE_POISONING is on, will take precedence over init_on_alloc\n"); | |
163 | if (bool_result) | |
164 | static_branch_enable(&init_on_alloc); | |
165 | else | |
166 | static_branch_disable(&init_on_alloc); | |
167 | return ret; | |
168 | } | |
169 | early_param("init_on_alloc", early_init_on_alloc); | |
170 | ||
171 | static int __init early_init_on_free(char *buf) | |
172 | { | |
173 | int ret; | |
174 | bool bool_result; | |
175 | ||
176 | if (!buf) | |
177 | return -EINVAL; | |
178 | ret = kstrtobool(buf, &bool_result); | |
179 | if (bool_result && page_poisoning_enabled()) | |
180 | pr_info("mem auto-init: CONFIG_PAGE_POISONING is on, will take precedence over init_on_free\n"); | |
181 | if (bool_result) | |
182 | static_branch_enable(&init_on_free); | |
183 | else | |
184 | static_branch_disable(&init_on_free); | |
185 | return ret; | |
186 | } | |
187 | early_param("init_on_free", early_init_on_free); | |
1da177e4 | 188 | |
bb14c2c7 VB |
189 | /* |
190 | * A cached value of the page's pageblock's migratetype, used when the page is | |
191 | * put on a pcplist. Used to avoid the pageblock migratetype lookup when | |
192 | * freeing from pcplists in most cases, at the cost of possibly becoming stale. | |
193 | * Also the migratetype set in the page does not necessarily match the pcplist | |
194 | * index, e.g. page might have MIGRATE_CMA set but be on a pcplist with any | |
195 | * other index - this ensures that it will be put on the correct CMA freelist. | |
196 | */ | |
197 | static inline int get_pcppage_migratetype(struct page *page) | |
198 | { | |
199 | return page->index; | |
200 | } | |
201 | ||
202 | static inline void set_pcppage_migratetype(struct page *page, int migratetype) | |
203 | { | |
204 | page->index = migratetype; | |
205 | } | |
206 | ||
452aa699 RW |
207 | #ifdef CONFIG_PM_SLEEP |
208 | /* | |
209 | * The following functions are used by the suspend/hibernate code to temporarily | |
210 | * change gfp_allowed_mask in order to avoid using I/O during memory allocations | |
211 | * while devices are suspended. To avoid races with the suspend/hibernate code, | |
55f2503c PL |
212 | * they should always be called with system_transition_mutex held |
213 | * (gfp_allowed_mask also should only be modified with system_transition_mutex | |
214 | * held, unless the suspend/hibernate code is guaranteed not to run in parallel | |
215 | * with that modification). | |
452aa699 | 216 | */ |
c9e664f1 RW |
217 | |
218 | static gfp_t saved_gfp_mask; | |
219 | ||
220 | void pm_restore_gfp_mask(void) | |
452aa699 | 221 | { |
55f2503c | 222 | WARN_ON(!mutex_is_locked(&system_transition_mutex)); |
c9e664f1 RW |
223 | if (saved_gfp_mask) { |
224 | gfp_allowed_mask = saved_gfp_mask; | |
225 | saved_gfp_mask = 0; | |
226 | } | |
452aa699 RW |
227 | } |
228 | ||
c9e664f1 | 229 | void pm_restrict_gfp_mask(void) |
452aa699 | 230 | { |
55f2503c | 231 | WARN_ON(!mutex_is_locked(&system_transition_mutex)); |
c9e664f1 RW |
232 | WARN_ON(saved_gfp_mask); |
233 | saved_gfp_mask = gfp_allowed_mask; | |
d0164adc | 234 | gfp_allowed_mask &= ~(__GFP_IO | __GFP_FS); |
452aa699 | 235 | } |
f90ac398 MG |
236 | |
237 | bool pm_suspended_storage(void) | |
238 | { | |
d0164adc | 239 | if ((gfp_allowed_mask & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS)) |
f90ac398 MG |
240 | return false; |
241 | return true; | |
242 | } | |
452aa699 RW |
243 | #endif /* CONFIG_PM_SLEEP */ |
244 | ||
d9c23400 | 245 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
d00181b9 | 246 | unsigned int pageblock_order __read_mostly; |
d9c23400 MG |
247 | #endif |
248 | ||
d98c7a09 | 249 | static void __free_pages_ok(struct page *page, unsigned int order); |
a226f6c8 | 250 | |
1da177e4 LT |
251 | /* |
252 | * results with 256, 32 in the lowmem_reserve sysctl: | |
253 | * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high) | |
254 | * 1G machine -> (16M dma, 784M normal, 224M high) | |
255 | * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA | |
256 | * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL | |
84109e15 | 257 | * HIGHMEM allocation will leave (224M+784M)/256 of ram reserved in ZONE_DMA |
a2f1b424 AK |
258 | * |
259 | * TBD: should special case ZONE_DMA32 machines here - in those we normally | |
260 | * don't need any ZONE_NORMAL reservation | |
1da177e4 | 261 | */ |
d3cda233 | 262 | int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES] = { |
4b51d669 | 263 | #ifdef CONFIG_ZONE_DMA |
d3cda233 | 264 | [ZONE_DMA] = 256, |
4b51d669 | 265 | #endif |
fb0e7942 | 266 | #ifdef CONFIG_ZONE_DMA32 |
d3cda233 | 267 | [ZONE_DMA32] = 256, |
fb0e7942 | 268 | #endif |
d3cda233 | 269 | [ZONE_NORMAL] = 32, |
e53ef38d | 270 | #ifdef CONFIG_HIGHMEM |
d3cda233 | 271 | [ZONE_HIGHMEM] = 0, |
e53ef38d | 272 | #endif |
d3cda233 | 273 | [ZONE_MOVABLE] = 0, |
2f1b6248 | 274 | }; |
1da177e4 | 275 | |
15ad7cdc | 276 | static char * const zone_names[MAX_NR_ZONES] = { |
4b51d669 | 277 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 278 | "DMA", |
4b51d669 | 279 | #endif |
fb0e7942 | 280 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 281 | "DMA32", |
fb0e7942 | 282 | #endif |
2f1b6248 | 283 | "Normal", |
e53ef38d | 284 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 285 | "HighMem", |
e53ef38d | 286 | #endif |
2a1e274a | 287 | "Movable", |
033fbae9 DW |
288 | #ifdef CONFIG_ZONE_DEVICE |
289 | "Device", | |
290 | #endif | |
2f1b6248 CL |
291 | }; |
292 | ||
c999fbd3 | 293 | const char * const migratetype_names[MIGRATE_TYPES] = { |
60f30350 VB |
294 | "Unmovable", |
295 | "Movable", | |
296 | "Reclaimable", | |
297 | "HighAtomic", | |
298 | #ifdef CONFIG_CMA | |
299 | "CMA", | |
300 | #endif | |
301 | #ifdef CONFIG_MEMORY_ISOLATION | |
302 | "Isolate", | |
303 | #endif | |
304 | }; | |
305 | ||
ae70eddd AK |
306 | compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS] = { |
307 | [NULL_COMPOUND_DTOR] = NULL, | |
308 | [COMPOUND_PAGE_DTOR] = free_compound_page, | |
f1e61557 | 309 | #ifdef CONFIG_HUGETLB_PAGE |
ae70eddd | 310 | [HUGETLB_PAGE_DTOR] = free_huge_page, |
f1e61557 | 311 | #endif |
9a982250 | 312 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
ae70eddd | 313 | [TRANSHUGE_PAGE_DTOR] = free_transhuge_page, |
9a982250 | 314 | #endif |
f1e61557 KS |
315 | }; |
316 | ||
1da177e4 | 317 | int min_free_kbytes = 1024; |
42aa83cb | 318 | int user_min_free_kbytes = -1; |
24512228 MG |
319 | #ifdef CONFIG_DISCONTIGMEM |
320 | /* | |
321 | * DiscontigMem defines memory ranges as separate pg_data_t even if the ranges | |
322 | * are not on separate NUMA nodes. Functionally this works but with | |
323 | * watermark_boost_factor, it can reclaim prematurely as the ranges can be | |
324 | * quite small. By default, do not boost watermarks on discontigmem as in | |
325 | * many cases very high-order allocations like THP are likely to be | |
326 | * unsupported and the premature reclaim offsets the advantage of long-term | |
327 | * fragmentation avoidance. | |
328 | */ | |
329 | int watermark_boost_factor __read_mostly; | |
330 | #else | |
1c30844d | 331 | int watermark_boost_factor __read_mostly = 15000; |
24512228 | 332 | #endif |
795ae7a0 | 333 | int watermark_scale_factor = 10; |
1da177e4 | 334 | |
bbe5d993 OS |
335 | static unsigned long nr_kernel_pages __initdata; |
336 | static unsigned long nr_all_pages __initdata; | |
337 | static unsigned long dma_reserve __initdata; | |
1da177e4 | 338 | |
bbe5d993 OS |
339 | static unsigned long arch_zone_lowest_possible_pfn[MAX_NR_ZONES] __initdata; |
340 | static unsigned long arch_zone_highest_possible_pfn[MAX_NR_ZONES] __initdata; | |
7f16f91f | 341 | static unsigned long required_kernelcore __initdata; |
a5c6d650 | 342 | static unsigned long required_kernelcore_percent __initdata; |
7f16f91f | 343 | static unsigned long required_movablecore __initdata; |
a5c6d650 | 344 | static unsigned long required_movablecore_percent __initdata; |
bbe5d993 | 345 | static unsigned long zone_movable_pfn[MAX_NUMNODES] __initdata; |
7f16f91f | 346 | static bool mirrored_kernelcore __meminitdata; |
0ee332c1 TH |
347 | |
348 | /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ | |
349 | int movable_zone; | |
350 | EXPORT_SYMBOL(movable_zone); | |
c713216d | 351 | |
418508c1 | 352 | #if MAX_NUMNODES > 1 |
b9726c26 | 353 | unsigned int nr_node_ids __read_mostly = MAX_NUMNODES; |
ce0725f7 | 354 | unsigned int nr_online_nodes __read_mostly = 1; |
418508c1 | 355 | EXPORT_SYMBOL(nr_node_ids); |
62bc62a8 | 356 | EXPORT_SYMBOL(nr_online_nodes); |
418508c1 MS |
357 | #endif |
358 | ||
9ef9acb0 MG |
359 | int page_group_by_mobility_disabled __read_mostly; |
360 | ||
3a80a7fa | 361 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
3c0c12cc WL |
362 | /* |
363 | * During boot we initialize deferred pages on-demand, as needed, but once | |
364 | * page_alloc_init_late() has finished, the deferred pages are all initialized, | |
365 | * and we can permanently disable that path. | |
366 | */ | |
367 | static DEFINE_STATIC_KEY_TRUE(deferred_pages); | |
368 | ||
369 | /* | |
370 | * Calling kasan_free_pages() only after deferred memory initialization | |
371 | * has completed. Poisoning pages during deferred memory init will greatly | |
372 | * lengthen the process and cause problem in large memory systems as the | |
373 | * deferred pages initialization is done with interrupt disabled. | |
374 | * | |
375 | * Assuming that there will be no reference to those newly initialized | |
376 | * pages before they are ever allocated, this should have no effect on | |
377 | * KASAN memory tracking as the poison will be properly inserted at page | |
378 | * allocation time. The only corner case is when pages are allocated by | |
379 | * on-demand allocation and then freed again before the deferred pages | |
380 | * initialization is done, but this is not likely to happen. | |
381 | */ | |
382 | static inline void kasan_free_nondeferred_pages(struct page *page, int order) | |
383 | { | |
384 | if (!static_branch_unlikely(&deferred_pages)) | |
385 | kasan_free_pages(page, order); | |
386 | } | |
387 | ||
3a80a7fa | 388 | /* Returns true if the struct page for the pfn is uninitialised */ |
0e1cc95b | 389 | static inline bool __meminit early_page_uninitialised(unsigned long pfn) |
3a80a7fa | 390 | { |
ef70b6f4 MG |
391 | int nid = early_pfn_to_nid(pfn); |
392 | ||
393 | if (node_online(nid) && pfn >= NODE_DATA(nid)->first_deferred_pfn) | |
3a80a7fa MG |
394 | return true; |
395 | ||
396 | return false; | |
397 | } | |
398 | ||
399 | /* | |
d3035be4 | 400 | * Returns true when the remaining initialisation should be deferred until |
3a80a7fa MG |
401 | * later in the boot cycle when it can be parallelised. |
402 | */ | |
d3035be4 PT |
403 | static bool __meminit |
404 | defer_init(int nid, unsigned long pfn, unsigned long end_pfn) | |
3a80a7fa | 405 | { |
d3035be4 PT |
406 | static unsigned long prev_end_pfn, nr_initialised; |
407 | ||
408 | /* | |
409 | * prev_end_pfn static that contains the end of previous zone | |
410 | * No need to protect because called very early in boot before smp_init. | |
411 | */ | |
412 | if (prev_end_pfn != end_pfn) { | |
413 | prev_end_pfn = end_pfn; | |
414 | nr_initialised = 0; | |
415 | } | |
416 | ||
3c2c6488 | 417 | /* Always populate low zones for address-constrained allocations */ |
d3035be4 | 418 | if (end_pfn < pgdat_end_pfn(NODE_DATA(nid))) |
3a80a7fa | 419 | return false; |
23b68cfa WY |
420 | |
421 | /* | |
422 | * We start only with one section of pages, more pages are added as | |
423 | * needed until the rest of deferred pages are initialized. | |
424 | */ | |
d3035be4 | 425 | nr_initialised++; |
23b68cfa | 426 | if ((nr_initialised > PAGES_PER_SECTION) && |
d3035be4 PT |
427 | (pfn & (PAGES_PER_SECTION - 1)) == 0) { |
428 | NODE_DATA(nid)->first_deferred_pfn = pfn; | |
429 | return true; | |
3a80a7fa | 430 | } |
d3035be4 | 431 | return false; |
3a80a7fa MG |
432 | } |
433 | #else | |
3c0c12cc WL |
434 | #define kasan_free_nondeferred_pages(p, o) kasan_free_pages(p, o) |
435 | ||
3a80a7fa MG |
436 | static inline bool early_page_uninitialised(unsigned long pfn) |
437 | { | |
438 | return false; | |
439 | } | |
440 | ||
d3035be4 | 441 | static inline bool defer_init(int nid, unsigned long pfn, unsigned long end_pfn) |
3a80a7fa | 442 | { |
d3035be4 | 443 | return false; |
3a80a7fa MG |
444 | } |
445 | #endif | |
446 | ||
0b423ca2 MG |
447 | /* Return a pointer to the bitmap storing bits affecting a block of pages */ |
448 | static inline unsigned long *get_pageblock_bitmap(struct page *page, | |
449 | unsigned long pfn) | |
450 | { | |
451 | #ifdef CONFIG_SPARSEMEM | |
f1eca35a | 452 | return section_to_usemap(__pfn_to_section(pfn)); |
0b423ca2 MG |
453 | #else |
454 | return page_zone(page)->pageblock_flags; | |
455 | #endif /* CONFIG_SPARSEMEM */ | |
456 | } | |
457 | ||
458 | static inline int pfn_to_bitidx(struct page *page, unsigned long pfn) | |
459 | { | |
460 | #ifdef CONFIG_SPARSEMEM | |
461 | pfn &= (PAGES_PER_SECTION-1); | |
462 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; | |
463 | #else | |
464 | pfn = pfn - round_down(page_zone(page)->zone_start_pfn, pageblock_nr_pages); | |
465 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; | |
466 | #endif /* CONFIG_SPARSEMEM */ | |
467 | } | |
468 | ||
469 | /** | |
470 | * get_pfnblock_flags_mask - Return the requested group of flags for the pageblock_nr_pages block of pages | |
471 | * @page: The page within the block of interest | |
472 | * @pfn: The target page frame number | |
473 | * @end_bitidx: The last bit of interest to retrieve | |
474 | * @mask: mask of bits that the caller is interested in | |
475 | * | |
476 | * Return: pageblock_bits flags | |
477 | */ | |
478 | static __always_inline unsigned long __get_pfnblock_flags_mask(struct page *page, | |
479 | unsigned long pfn, | |
480 | unsigned long end_bitidx, | |
481 | unsigned long mask) | |
482 | { | |
483 | unsigned long *bitmap; | |
484 | unsigned long bitidx, word_bitidx; | |
485 | unsigned long word; | |
486 | ||
487 | bitmap = get_pageblock_bitmap(page, pfn); | |
488 | bitidx = pfn_to_bitidx(page, pfn); | |
489 | word_bitidx = bitidx / BITS_PER_LONG; | |
490 | bitidx &= (BITS_PER_LONG-1); | |
491 | ||
492 | word = bitmap[word_bitidx]; | |
493 | bitidx += end_bitidx; | |
494 | return (word >> (BITS_PER_LONG - bitidx - 1)) & mask; | |
495 | } | |
496 | ||
497 | unsigned long get_pfnblock_flags_mask(struct page *page, unsigned long pfn, | |
498 | unsigned long end_bitidx, | |
499 | unsigned long mask) | |
500 | { | |
501 | return __get_pfnblock_flags_mask(page, pfn, end_bitidx, mask); | |
502 | } | |
503 | ||
504 | static __always_inline int get_pfnblock_migratetype(struct page *page, unsigned long pfn) | |
505 | { | |
506 | return __get_pfnblock_flags_mask(page, pfn, PB_migrate_end, MIGRATETYPE_MASK); | |
507 | } | |
508 | ||
509 | /** | |
510 | * set_pfnblock_flags_mask - Set the requested group of flags for a pageblock_nr_pages block of pages | |
511 | * @page: The page within the block of interest | |
512 | * @flags: The flags to set | |
513 | * @pfn: The target page frame number | |
514 | * @end_bitidx: The last bit of interest | |
515 | * @mask: mask of bits that the caller is interested in | |
516 | */ | |
517 | void set_pfnblock_flags_mask(struct page *page, unsigned long flags, | |
518 | unsigned long pfn, | |
519 | unsigned long end_bitidx, | |
520 | unsigned long mask) | |
521 | { | |
522 | unsigned long *bitmap; | |
523 | unsigned long bitidx, word_bitidx; | |
524 | unsigned long old_word, word; | |
525 | ||
526 | BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4); | |
125b860b | 527 | BUILD_BUG_ON(MIGRATE_TYPES > (1 << PB_migratetype_bits)); |
0b423ca2 MG |
528 | |
529 | bitmap = get_pageblock_bitmap(page, pfn); | |
530 | bitidx = pfn_to_bitidx(page, pfn); | |
531 | word_bitidx = bitidx / BITS_PER_LONG; | |
532 | bitidx &= (BITS_PER_LONG-1); | |
533 | ||
534 | VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn), page); | |
535 | ||
536 | bitidx += end_bitidx; | |
537 | mask <<= (BITS_PER_LONG - bitidx - 1); | |
538 | flags <<= (BITS_PER_LONG - bitidx - 1); | |
539 | ||
540 | word = READ_ONCE(bitmap[word_bitidx]); | |
541 | for (;;) { | |
542 | old_word = cmpxchg(&bitmap[word_bitidx], word, (word & ~mask) | flags); | |
543 | if (word == old_word) | |
544 | break; | |
545 | word = old_word; | |
546 | } | |
547 | } | |
3a80a7fa | 548 | |
ee6f509c | 549 | void set_pageblock_migratetype(struct page *page, int migratetype) |
b2a0ac88 | 550 | { |
5d0f3f72 KM |
551 | if (unlikely(page_group_by_mobility_disabled && |
552 | migratetype < MIGRATE_PCPTYPES)) | |
49255c61 MG |
553 | migratetype = MIGRATE_UNMOVABLE; |
554 | ||
b2a0ac88 MG |
555 | set_pageblock_flags_group(page, (unsigned long)migratetype, |
556 | PB_migrate, PB_migrate_end); | |
557 | } | |
558 | ||
13e7444b | 559 | #ifdef CONFIG_DEBUG_VM |
c6a57e19 | 560 | static int page_outside_zone_boundaries(struct zone *zone, struct page *page) |
1da177e4 | 561 | { |
bdc8cb98 DH |
562 | int ret = 0; |
563 | unsigned seq; | |
564 | unsigned long pfn = page_to_pfn(page); | |
b5e6a5a2 | 565 | unsigned long sp, start_pfn; |
c6a57e19 | 566 | |
bdc8cb98 DH |
567 | do { |
568 | seq = zone_span_seqbegin(zone); | |
b5e6a5a2 CS |
569 | start_pfn = zone->zone_start_pfn; |
570 | sp = zone->spanned_pages; | |
108bcc96 | 571 | if (!zone_spans_pfn(zone, pfn)) |
bdc8cb98 DH |
572 | ret = 1; |
573 | } while (zone_span_seqretry(zone, seq)); | |
574 | ||
b5e6a5a2 | 575 | if (ret) |
613813e8 DH |
576 | pr_err("page 0x%lx outside node %d zone %s [ 0x%lx - 0x%lx ]\n", |
577 | pfn, zone_to_nid(zone), zone->name, | |
578 | start_pfn, start_pfn + sp); | |
b5e6a5a2 | 579 | |
bdc8cb98 | 580 | return ret; |
c6a57e19 DH |
581 | } |
582 | ||
583 | static int page_is_consistent(struct zone *zone, struct page *page) | |
584 | { | |
14e07298 | 585 | if (!pfn_valid_within(page_to_pfn(page))) |
c6a57e19 | 586 | return 0; |
1da177e4 | 587 | if (zone != page_zone(page)) |
c6a57e19 DH |
588 | return 0; |
589 | ||
590 | return 1; | |
591 | } | |
592 | /* | |
593 | * Temporary debugging check for pages not lying within a given zone. | |
594 | */ | |
d73d3c9f | 595 | static int __maybe_unused bad_range(struct zone *zone, struct page *page) |
c6a57e19 DH |
596 | { |
597 | if (page_outside_zone_boundaries(zone, page)) | |
1da177e4 | 598 | return 1; |
c6a57e19 DH |
599 | if (!page_is_consistent(zone, page)) |
600 | return 1; | |
601 | ||
1da177e4 LT |
602 | return 0; |
603 | } | |
13e7444b | 604 | #else |
d73d3c9f | 605 | static inline int __maybe_unused bad_range(struct zone *zone, struct page *page) |
13e7444b NP |
606 | { |
607 | return 0; | |
608 | } | |
609 | #endif | |
610 | ||
82a3241a | 611 | static void bad_page(struct page *page, const char *reason) |
1da177e4 | 612 | { |
d936cf9b HD |
613 | static unsigned long resume; |
614 | static unsigned long nr_shown; | |
615 | static unsigned long nr_unshown; | |
616 | ||
617 | /* | |
618 | * Allow a burst of 60 reports, then keep quiet for that minute; | |
619 | * or allow a steady drip of one report per second. | |
620 | */ | |
621 | if (nr_shown == 60) { | |
622 | if (time_before(jiffies, resume)) { | |
623 | nr_unshown++; | |
624 | goto out; | |
625 | } | |
626 | if (nr_unshown) { | |
ff8e8116 | 627 | pr_alert( |
1e9e6365 | 628 | "BUG: Bad page state: %lu messages suppressed\n", |
d936cf9b HD |
629 | nr_unshown); |
630 | nr_unshown = 0; | |
631 | } | |
632 | nr_shown = 0; | |
633 | } | |
634 | if (nr_shown++ == 0) | |
635 | resume = jiffies + 60 * HZ; | |
636 | ||
ff8e8116 | 637 | pr_alert("BUG: Bad page state in process %s pfn:%05lx\n", |
3dc14741 | 638 | current->comm, page_to_pfn(page)); |
ff8e8116 | 639 | __dump_page(page, reason); |
4e462112 | 640 | dump_page_owner(page); |
3dc14741 | 641 | |
4f31888c | 642 | print_modules(); |
1da177e4 | 643 | dump_stack(); |
d936cf9b | 644 | out: |
8cc3b392 | 645 | /* Leave bad fields for debug, except PageBuddy could make trouble */ |
22b751c3 | 646 | page_mapcount_reset(page); /* remove PageBuddy */ |
373d4d09 | 647 | add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
648 | } |
649 | ||
1da177e4 LT |
650 | /* |
651 | * Higher-order pages are called "compound pages". They are structured thusly: | |
652 | * | |
1d798ca3 | 653 | * The first PAGE_SIZE page is called the "head page" and have PG_head set. |
1da177e4 | 654 | * |
1d798ca3 KS |
655 | * The remaining PAGE_SIZE pages are called "tail pages". PageTail() is encoded |
656 | * in bit 0 of page->compound_head. The rest of bits is pointer to head page. | |
1da177e4 | 657 | * |
1d798ca3 KS |
658 | * The first tail page's ->compound_dtor holds the offset in array of compound |
659 | * page destructors. See compound_page_dtors. | |
1da177e4 | 660 | * |
1d798ca3 | 661 | * The first tail page's ->compound_order holds the order of allocation. |
41d78ba5 | 662 | * This usage means that zero-order pages may not be compound. |
1da177e4 | 663 | */ |
d98c7a09 | 664 | |
9a982250 | 665 | void free_compound_page(struct page *page) |
d98c7a09 | 666 | { |
7ae88534 | 667 | mem_cgroup_uncharge(page); |
d85f3385 | 668 | __free_pages_ok(page, compound_order(page)); |
d98c7a09 HD |
669 | } |
670 | ||
d00181b9 | 671 | void prep_compound_page(struct page *page, unsigned int order) |
18229df5 AW |
672 | { |
673 | int i; | |
674 | int nr_pages = 1 << order; | |
675 | ||
f1e61557 | 676 | set_compound_page_dtor(page, COMPOUND_PAGE_DTOR); |
18229df5 AW |
677 | set_compound_order(page, order); |
678 | __SetPageHead(page); | |
679 | for (i = 1; i < nr_pages; i++) { | |
680 | struct page *p = page + i; | |
58a84aa9 | 681 | set_page_count(p, 0); |
1c290f64 | 682 | p->mapping = TAIL_MAPPING; |
1d798ca3 | 683 | set_compound_head(p, page); |
18229df5 | 684 | } |
53f9263b | 685 | atomic_set(compound_mapcount_ptr(page), -1); |
47e29d32 JH |
686 | if (hpage_pincount_available(page)) |
687 | atomic_set(compound_pincount_ptr(page), 0); | |
18229df5 AW |
688 | } |
689 | ||
c0a32fc5 SG |
690 | #ifdef CONFIG_DEBUG_PAGEALLOC |
691 | unsigned int _debug_guardpage_minorder; | |
96a2b03f | 692 | |
8e57f8ac VB |
693 | bool _debug_pagealloc_enabled_early __read_mostly |
694 | = IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT); | |
695 | EXPORT_SYMBOL(_debug_pagealloc_enabled_early); | |
96a2b03f | 696 | DEFINE_STATIC_KEY_FALSE(_debug_pagealloc_enabled); |
505f6d22 | 697 | EXPORT_SYMBOL(_debug_pagealloc_enabled); |
96a2b03f VB |
698 | |
699 | DEFINE_STATIC_KEY_FALSE(_debug_guardpage_enabled); | |
e30825f1 | 700 | |
031bc574 JK |
701 | static int __init early_debug_pagealloc(char *buf) |
702 | { | |
8e57f8ac | 703 | return kstrtobool(buf, &_debug_pagealloc_enabled_early); |
031bc574 JK |
704 | } |
705 | early_param("debug_pagealloc", early_debug_pagealloc); | |
706 | ||
8e57f8ac | 707 | void init_debug_pagealloc(void) |
e30825f1 | 708 | { |
031bc574 JK |
709 | if (!debug_pagealloc_enabled()) |
710 | return; | |
711 | ||
8e57f8ac VB |
712 | static_branch_enable(&_debug_pagealloc_enabled); |
713 | ||
f1c1e9f7 JK |
714 | if (!debug_guardpage_minorder()) |
715 | return; | |
716 | ||
96a2b03f | 717 | static_branch_enable(&_debug_guardpage_enabled); |
e30825f1 JK |
718 | } |
719 | ||
c0a32fc5 SG |
720 | static int __init debug_guardpage_minorder_setup(char *buf) |
721 | { | |
722 | unsigned long res; | |
723 | ||
724 | if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) { | |
1170532b | 725 | pr_err("Bad debug_guardpage_minorder value\n"); |
c0a32fc5 SG |
726 | return 0; |
727 | } | |
728 | _debug_guardpage_minorder = res; | |
1170532b | 729 | pr_info("Setting debug_guardpage_minorder to %lu\n", res); |
c0a32fc5 SG |
730 | return 0; |
731 | } | |
f1c1e9f7 | 732 | early_param("debug_guardpage_minorder", debug_guardpage_minorder_setup); |
c0a32fc5 | 733 | |
acbc15a4 | 734 | static inline bool set_page_guard(struct zone *zone, struct page *page, |
2847cf95 | 735 | unsigned int order, int migratetype) |
c0a32fc5 | 736 | { |
e30825f1 | 737 | if (!debug_guardpage_enabled()) |
acbc15a4 JK |
738 | return false; |
739 | ||
740 | if (order >= debug_guardpage_minorder()) | |
741 | return false; | |
e30825f1 | 742 | |
3972f6bb | 743 | __SetPageGuard(page); |
2847cf95 JK |
744 | INIT_LIST_HEAD(&page->lru); |
745 | set_page_private(page, order); | |
746 | /* Guard pages are not available for any usage */ | |
747 | __mod_zone_freepage_state(zone, -(1 << order), migratetype); | |
acbc15a4 JK |
748 | |
749 | return true; | |
c0a32fc5 SG |
750 | } |
751 | ||
2847cf95 JK |
752 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
753 | unsigned int order, int migratetype) | |
c0a32fc5 | 754 | { |
e30825f1 JK |
755 | if (!debug_guardpage_enabled()) |
756 | return; | |
757 | ||
3972f6bb | 758 | __ClearPageGuard(page); |
e30825f1 | 759 | |
2847cf95 JK |
760 | set_page_private(page, 0); |
761 | if (!is_migrate_isolate(migratetype)) | |
762 | __mod_zone_freepage_state(zone, (1 << order), migratetype); | |
c0a32fc5 SG |
763 | } |
764 | #else | |
acbc15a4 JK |
765 | static inline bool set_page_guard(struct zone *zone, struct page *page, |
766 | unsigned int order, int migratetype) { return false; } | |
2847cf95 JK |
767 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
768 | unsigned int order, int migratetype) {} | |
c0a32fc5 SG |
769 | #endif |
770 | ||
7aeb09f9 | 771 | static inline void set_page_order(struct page *page, unsigned int order) |
6aa3001b | 772 | { |
4c21e2f2 | 773 | set_page_private(page, order); |
676165a8 | 774 | __SetPageBuddy(page); |
1da177e4 LT |
775 | } |
776 | ||
1da177e4 LT |
777 | /* |
778 | * This function checks whether a page is free && is the buddy | |
6e292b9b | 779 | * we can coalesce a page and its buddy if |
13ad59df | 780 | * (a) the buddy is not in a hole (check before calling!) && |
676165a8 | 781 | * (b) the buddy is in the buddy system && |
cb2b95e1 AW |
782 | * (c) a page and its buddy have the same order && |
783 | * (d) a page and its buddy are in the same zone. | |
676165a8 | 784 | * |
6e292b9b MW |
785 | * For recording whether a page is in the buddy system, we set PageBuddy. |
786 | * Setting, clearing, and testing PageBuddy is serialized by zone->lock. | |
1da177e4 | 787 | * |
676165a8 | 788 | * For recording page's order, we use page_private(page). |
1da177e4 | 789 | */ |
fe925c0c | 790 | static inline bool page_is_buddy(struct page *page, struct page *buddy, |
7aeb09f9 | 791 | unsigned int order) |
1da177e4 | 792 | { |
fe925c0c | 793 | if (!page_is_guard(buddy) && !PageBuddy(buddy)) |
794 | return false; | |
4c5018ce | 795 | |
fe925c0c | 796 | if (page_order(buddy) != order) |
797 | return false; | |
c0a32fc5 | 798 | |
fe925c0c | 799 | /* |
800 | * zone check is done late to avoid uselessly calculating | |
801 | * zone/node ids for pages that could never merge. | |
802 | */ | |
803 | if (page_zone_id(page) != page_zone_id(buddy)) | |
804 | return false; | |
d34c5fa0 | 805 | |
fe925c0c | 806 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); |
4c5018ce | 807 | |
fe925c0c | 808 | return true; |
1da177e4 LT |
809 | } |
810 | ||
5e1f0f09 MG |
811 | #ifdef CONFIG_COMPACTION |
812 | static inline struct capture_control *task_capc(struct zone *zone) | |
813 | { | |
814 | struct capture_control *capc = current->capture_control; | |
815 | ||
816 | return capc && | |
817 | !(current->flags & PF_KTHREAD) && | |
818 | !capc->page && | |
819 | capc->cc->zone == zone && | |
820 | capc->cc->direct_compaction ? capc : NULL; | |
821 | } | |
822 | ||
823 | static inline bool | |
824 | compaction_capture(struct capture_control *capc, struct page *page, | |
825 | int order, int migratetype) | |
826 | { | |
827 | if (!capc || order != capc->cc->order) | |
828 | return false; | |
829 | ||
830 | /* Do not accidentally pollute CMA or isolated regions*/ | |
831 | if (is_migrate_cma(migratetype) || | |
832 | is_migrate_isolate(migratetype)) | |
833 | return false; | |
834 | ||
835 | /* | |
836 | * Do not let lower order allocations polluate a movable pageblock. | |
837 | * This might let an unmovable request use a reclaimable pageblock | |
838 | * and vice-versa but no more than normal fallback logic which can | |
839 | * have trouble finding a high-order free page. | |
840 | */ | |
841 | if (order < pageblock_order && migratetype == MIGRATE_MOVABLE) | |
842 | return false; | |
843 | ||
844 | capc->page = page; | |
845 | return true; | |
846 | } | |
847 | ||
848 | #else | |
849 | static inline struct capture_control *task_capc(struct zone *zone) | |
850 | { | |
851 | return NULL; | |
852 | } | |
853 | ||
854 | static inline bool | |
855 | compaction_capture(struct capture_control *capc, struct page *page, | |
856 | int order, int migratetype) | |
857 | { | |
858 | return false; | |
859 | } | |
860 | #endif /* CONFIG_COMPACTION */ | |
861 | ||
6ab01363 AD |
862 | /* Used for pages not on another list */ |
863 | static inline void add_to_free_list(struct page *page, struct zone *zone, | |
864 | unsigned int order, int migratetype) | |
865 | { | |
866 | struct free_area *area = &zone->free_area[order]; | |
867 | ||
868 | list_add(&page->lru, &area->free_list[migratetype]); | |
869 | area->nr_free++; | |
870 | } | |
871 | ||
872 | /* Used for pages not on another list */ | |
873 | static inline void add_to_free_list_tail(struct page *page, struct zone *zone, | |
874 | unsigned int order, int migratetype) | |
875 | { | |
876 | struct free_area *area = &zone->free_area[order]; | |
877 | ||
878 | list_add_tail(&page->lru, &area->free_list[migratetype]); | |
879 | area->nr_free++; | |
880 | } | |
881 | ||
882 | /* Used for pages which are on another list */ | |
883 | static inline void move_to_free_list(struct page *page, struct zone *zone, | |
884 | unsigned int order, int migratetype) | |
885 | { | |
886 | struct free_area *area = &zone->free_area[order]; | |
887 | ||
888 | list_move(&page->lru, &area->free_list[migratetype]); | |
889 | } | |
890 | ||
891 | static inline void del_page_from_free_list(struct page *page, struct zone *zone, | |
892 | unsigned int order) | |
893 | { | |
36e66c55 AD |
894 | /* clear reported state and update reported page count */ |
895 | if (page_reported(page)) | |
896 | __ClearPageReported(page); | |
897 | ||
6ab01363 AD |
898 | list_del(&page->lru); |
899 | __ClearPageBuddy(page); | |
900 | set_page_private(page, 0); | |
901 | zone->free_area[order].nr_free--; | |
902 | } | |
903 | ||
a2129f24 AD |
904 | /* |
905 | * If this is not the largest possible page, check if the buddy | |
906 | * of the next-highest order is free. If it is, it's possible | |
907 | * that pages are being freed that will coalesce soon. In case, | |
908 | * that is happening, add the free page to the tail of the list | |
909 | * so it's less likely to be used soon and more likely to be merged | |
910 | * as a higher order page | |
911 | */ | |
912 | static inline bool | |
913 | buddy_merge_likely(unsigned long pfn, unsigned long buddy_pfn, | |
914 | struct page *page, unsigned int order) | |
915 | { | |
916 | struct page *higher_page, *higher_buddy; | |
917 | unsigned long combined_pfn; | |
918 | ||
919 | if (order >= MAX_ORDER - 2) | |
920 | return false; | |
921 | ||
922 | if (!pfn_valid_within(buddy_pfn)) | |
923 | return false; | |
924 | ||
925 | combined_pfn = buddy_pfn & pfn; | |
926 | higher_page = page + (combined_pfn - pfn); | |
927 | buddy_pfn = __find_buddy_pfn(combined_pfn, order + 1); | |
928 | higher_buddy = higher_page + (buddy_pfn - combined_pfn); | |
929 | ||
930 | return pfn_valid_within(buddy_pfn) && | |
931 | page_is_buddy(higher_page, higher_buddy, order + 1); | |
932 | } | |
933 | ||
1da177e4 LT |
934 | /* |
935 | * Freeing function for a buddy system allocator. | |
936 | * | |
937 | * The concept of a buddy system is to maintain direct-mapped table | |
938 | * (containing bit values) for memory blocks of various "orders". | |
939 | * The bottom level table contains the map for the smallest allocatable | |
940 | * units of memory (here, pages), and each level above it describes | |
941 | * pairs of units from the levels below, hence, "buddies". | |
942 | * At a high level, all that happens here is marking the table entry | |
943 | * at the bottom level available, and propagating the changes upward | |
944 | * as necessary, plus some accounting needed to play nicely with other | |
945 | * parts of the VM system. | |
946 | * At each level, we keep a list of pages, which are heads of continuous | |
6e292b9b MW |
947 | * free pages of length of (1 << order) and marked with PageBuddy. |
948 | * Page's order is recorded in page_private(page) field. | |
1da177e4 | 949 | * So when we are allocating or freeing one, we can derive the state of the |
5f63b720 MN |
950 | * other. That is, if we allocate a small block, and both were |
951 | * free, the remainder of the region must be split into blocks. | |
1da177e4 | 952 | * If a block is freed, and its buddy is also free, then this |
5f63b720 | 953 | * triggers coalescing into a block of larger size. |
1da177e4 | 954 | * |
6d49e352 | 955 | * -- nyc |
1da177e4 LT |
956 | */ |
957 | ||
48db57f8 | 958 | static inline void __free_one_page(struct page *page, |
dc4b0caf | 959 | unsigned long pfn, |
ed0ae21d | 960 | struct zone *zone, unsigned int order, |
36e66c55 | 961 | int migratetype, bool report) |
1da177e4 | 962 | { |
a2129f24 | 963 | struct capture_control *capc = task_capc(zone); |
3f649ab7 | 964 | unsigned long buddy_pfn; |
a2129f24 | 965 | unsigned long combined_pfn; |
d9dddbf5 | 966 | unsigned int max_order; |
a2129f24 AD |
967 | struct page *buddy; |
968 | bool to_tail; | |
d9dddbf5 VB |
969 | |
970 | max_order = min_t(unsigned int, MAX_ORDER, pageblock_order + 1); | |
1da177e4 | 971 | |
d29bb978 | 972 | VM_BUG_ON(!zone_is_initialized(zone)); |
6e9f0d58 | 973 | VM_BUG_ON_PAGE(page->flags & PAGE_FLAGS_CHECK_AT_PREP, page); |
1da177e4 | 974 | |
ed0ae21d | 975 | VM_BUG_ON(migratetype == -1); |
d9dddbf5 | 976 | if (likely(!is_migrate_isolate(migratetype))) |
8f82b55d | 977 | __mod_zone_freepage_state(zone, 1 << order, migratetype); |
ed0ae21d | 978 | |
76741e77 | 979 | VM_BUG_ON_PAGE(pfn & ((1 << order) - 1), page); |
309381fe | 980 | VM_BUG_ON_PAGE(bad_range(zone, page), page); |
1da177e4 | 981 | |
d9dddbf5 | 982 | continue_merging: |
3c605096 | 983 | while (order < max_order - 1) { |
5e1f0f09 MG |
984 | if (compaction_capture(capc, page, order, migratetype)) { |
985 | __mod_zone_freepage_state(zone, -(1 << order), | |
986 | migratetype); | |
987 | return; | |
988 | } | |
76741e77 VB |
989 | buddy_pfn = __find_buddy_pfn(pfn, order); |
990 | buddy = page + (buddy_pfn - pfn); | |
13ad59df VB |
991 | |
992 | if (!pfn_valid_within(buddy_pfn)) | |
993 | goto done_merging; | |
cb2b95e1 | 994 | if (!page_is_buddy(page, buddy, order)) |
d9dddbf5 | 995 | goto done_merging; |
c0a32fc5 SG |
996 | /* |
997 | * Our buddy is free or it is CONFIG_DEBUG_PAGEALLOC guard page, | |
998 | * merge with it and move up one order. | |
999 | */ | |
b03641af | 1000 | if (page_is_guard(buddy)) |
2847cf95 | 1001 | clear_page_guard(zone, buddy, order, migratetype); |
b03641af | 1002 | else |
6ab01363 | 1003 | del_page_from_free_list(buddy, zone, order); |
76741e77 VB |
1004 | combined_pfn = buddy_pfn & pfn; |
1005 | page = page + (combined_pfn - pfn); | |
1006 | pfn = combined_pfn; | |
1da177e4 LT |
1007 | order++; |
1008 | } | |
d9dddbf5 VB |
1009 | if (max_order < MAX_ORDER) { |
1010 | /* If we are here, it means order is >= pageblock_order. | |
1011 | * We want to prevent merge between freepages on isolate | |
1012 | * pageblock and normal pageblock. Without this, pageblock | |
1013 | * isolation could cause incorrect freepage or CMA accounting. | |
1014 | * | |
1015 | * We don't want to hit this code for the more frequent | |
1016 | * low-order merging. | |
1017 | */ | |
1018 | if (unlikely(has_isolate_pageblock(zone))) { | |
1019 | int buddy_mt; | |
1020 | ||
76741e77 VB |
1021 | buddy_pfn = __find_buddy_pfn(pfn, order); |
1022 | buddy = page + (buddy_pfn - pfn); | |
d9dddbf5 VB |
1023 | buddy_mt = get_pageblock_migratetype(buddy); |
1024 | ||
1025 | if (migratetype != buddy_mt | |
1026 | && (is_migrate_isolate(migratetype) || | |
1027 | is_migrate_isolate(buddy_mt))) | |
1028 | goto done_merging; | |
1029 | } | |
1030 | max_order++; | |
1031 | goto continue_merging; | |
1032 | } | |
1033 | ||
1034 | done_merging: | |
1da177e4 | 1035 | set_page_order(page, order); |
6dda9d55 | 1036 | |
97500a4a | 1037 | if (is_shuffle_order(order)) |
a2129f24 | 1038 | to_tail = shuffle_pick_tail(); |
97500a4a | 1039 | else |
a2129f24 | 1040 | to_tail = buddy_merge_likely(pfn, buddy_pfn, page, order); |
97500a4a | 1041 | |
a2129f24 | 1042 | if (to_tail) |
6ab01363 | 1043 | add_to_free_list_tail(page, zone, order, migratetype); |
a2129f24 | 1044 | else |
6ab01363 | 1045 | add_to_free_list(page, zone, order, migratetype); |
36e66c55 AD |
1046 | |
1047 | /* Notify page reporting subsystem of freed page */ | |
1048 | if (report) | |
1049 | page_reporting_notify_free(order); | |
1da177e4 LT |
1050 | } |
1051 | ||
7bfec6f4 MG |
1052 | /* |
1053 | * A bad page could be due to a number of fields. Instead of multiple branches, | |
1054 | * try and check multiple fields with one check. The caller must do a detailed | |
1055 | * check if necessary. | |
1056 | */ | |
1057 | static inline bool page_expected_state(struct page *page, | |
1058 | unsigned long check_flags) | |
1059 | { | |
1060 | if (unlikely(atomic_read(&page->_mapcount) != -1)) | |
1061 | return false; | |
1062 | ||
1063 | if (unlikely((unsigned long)page->mapping | | |
1064 | page_ref_count(page) | | |
1065 | #ifdef CONFIG_MEMCG | |
1066 | (unsigned long)page->mem_cgroup | | |
1067 | #endif | |
1068 | (page->flags & check_flags))) | |
1069 | return false; | |
1070 | ||
1071 | return true; | |
1072 | } | |
1073 | ||
58b7f119 | 1074 | static const char *page_bad_reason(struct page *page, unsigned long flags) |
1da177e4 | 1075 | { |
82a3241a | 1076 | const char *bad_reason = NULL; |
f0b791a3 | 1077 | |
53f9263b | 1078 | if (unlikely(atomic_read(&page->_mapcount) != -1)) |
f0b791a3 DH |
1079 | bad_reason = "nonzero mapcount"; |
1080 | if (unlikely(page->mapping != NULL)) | |
1081 | bad_reason = "non-NULL mapping"; | |
fe896d18 | 1082 | if (unlikely(page_ref_count(page) != 0)) |
0139aa7b | 1083 | bad_reason = "nonzero _refcount"; |
58b7f119 WY |
1084 | if (unlikely(page->flags & flags)) { |
1085 | if (flags == PAGE_FLAGS_CHECK_AT_PREP) | |
1086 | bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag(s) set"; | |
1087 | else | |
1088 | bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set"; | |
f0b791a3 | 1089 | } |
9edad6ea JW |
1090 | #ifdef CONFIG_MEMCG |
1091 | if (unlikely(page->mem_cgroup)) | |
1092 | bad_reason = "page still charged to cgroup"; | |
1093 | #endif | |
58b7f119 WY |
1094 | return bad_reason; |
1095 | } | |
1096 | ||
1097 | static void check_free_page_bad(struct page *page) | |
1098 | { | |
1099 | bad_page(page, | |
1100 | page_bad_reason(page, PAGE_FLAGS_CHECK_AT_FREE)); | |
bb552ac6 MG |
1101 | } |
1102 | ||
534fe5e3 | 1103 | static inline int check_free_page(struct page *page) |
bb552ac6 | 1104 | { |
da838d4f | 1105 | if (likely(page_expected_state(page, PAGE_FLAGS_CHECK_AT_FREE))) |
bb552ac6 | 1106 | return 0; |
bb552ac6 MG |
1107 | |
1108 | /* Something has gone sideways, find it */ | |
0d0c48a2 | 1109 | check_free_page_bad(page); |
7bfec6f4 | 1110 | return 1; |
1da177e4 LT |
1111 | } |
1112 | ||
4db7548c MG |
1113 | static int free_tail_pages_check(struct page *head_page, struct page *page) |
1114 | { | |
1115 | int ret = 1; | |
1116 | ||
1117 | /* | |
1118 | * We rely page->lru.next never has bit 0 set, unless the page | |
1119 | * is PageTail(). Let's make sure that's true even for poisoned ->lru. | |
1120 | */ | |
1121 | BUILD_BUG_ON((unsigned long)LIST_POISON1 & 1); | |
1122 | ||
1123 | if (!IS_ENABLED(CONFIG_DEBUG_VM)) { | |
1124 | ret = 0; | |
1125 | goto out; | |
1126 | } | |
1127 | switch (page - head_page) { | |
1128 | case 1: | |
4da1984e | 1129 | /* the first tail page: ->mapping may be compound_mapcount() */ |
4db7548c | 1130 | if (unlikely(compound_mapcount(page))) { |
82a3241a | 1131 | bad_page(page, "nonzero compound_mapcount"); |
4db7548c MG |
1132 | goto out; |
1133 | } | |
1134 | break; | |
1135 | case 2: | |
1136 | /* | |
1137 | * the second tail page: ->mapping is | |
fa3015b7 | 1138 | * deferred_list.next -- ignore value. |
4db7548c MG |
1139 | */ |
1140 | break; | |
1141 | default: | |
1142 | if (page->mapping != TAIL_MAPPING) { | |
82a3241a | 1143 | bad_page(page, "corrupted mapping in tail page"); |
4db7548c MG |
1144 | goto out; |
1145 | } | |
1146 | break; | |
1147 | } | |
1148 | if (unlikely(!PageTail(page))) { | |
82a3241a | 1149 | bad_page(page, "PageTail not set"); |
4db7548c MG |
1150 | goto out; |
1151 | } | |
1152 | if (unlikely(compound_head(page) != head_page)) { | |
82a3241a | 1153 | bad_page(page, "compound_head not consistent"); |
4db7548c MG |
1154 | goto out; |
1155 | } | |
1156 | ret = 0; | |
1157 | out: | |
1158 | page->mapping = NULL; | |
1159 | clear_compound_head(page); | |
1160 | return ret; | |
1161 | } | |
1162 | ||
6471384a AP |
1163 | static void kernel_init_free_pages(struct page *page, int numpages) |
1164 | { | |
1165 | int i; | |
1166 | ||
1167 | for (i = 0; i < numpages; i++) | |
1168 | clear_highpage(page + i); | |
1169 | } | |
1170 | ||
e2769dbd MG |
1171 | static __always_inline bool free_pages_prepare(struct page *page, |
1172 | unsigned int order, bool check_free) | |
4db7548c | 1173 | { |
e2769dbd | 1174 | int bad = 0; |
4db7548c | 1175 | |
4db7548c MG |
1176 | VM_BUG_ON_PAGE(PageTail(page), page); |
1177 | ||
e2769dbd | 1178 | trace_mm_page_free(page, order); |
e2769dbd MG |
1179 | |
1180 | /* | |
1181 | * Check tail pages before head page information is cleared to | |
1182 | * avoid checking PageCompound for order-0 pages. | |
1183 | */ | |
1184 | if (unlikely(order)) { | |
1185 | bool compound = PageCompound(page); | |
1186 | int i; | |
1187 | ||
1188 | VM_BUG_ON_PAGE(compound && compound_order(page) != order, page); | |
4db7548c | 1189 | |
9a73f61b KS |
1190 | if (compound) |
1191 | ClearPageDoubleMap(page); | |
e2769dbd MG |
1192 | for (i = 1; i < (1 << order); i++) { |
1193 | if (compound) | |
1194 | bad += free_tail_pages_check(page, page + i); | |
534fe5e3 | 1195 | if (unlikely(check_free_page(page + i))) { |
e2769dbd MG |
1196 | bad++; |
1197 | continue; | |
1198 | } | |
1199 | (page + i)->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; | |
1200 | } | |
1201 | } | |
bda807d4 | 1202 | if (PageMappingFlags(page)) |
4db7548c | 1203 | page->mapping = NULL; |
c4159a75 | 1204 | if (memcg_kmem_enabled() && PageKmemcg(page)) |
f4b00eab | 1205 | __memcg_kmem_uncharge_page(page, order); |
e2769dbd | 1206 | if (check_free) |
534fe5e3 | 1207 | bad += check_free_page(page); |
e2769dbd MG |
1208 | if (bad) |
1209 | return false; | |
4db7548c | 1210 | |
e2769dbd MG |
1211 | page_cpupid_reset_last(page); |
1212 | page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; | |
1213 | reset_page_owner(page, order); | |
4db7548c MG |
1214 | |
1215 | if (!PageHighMem(page)) { | |
1216 | debug_check_no_locks_freed(page_address(page), | |
e2769dbd | 1217 | PAGE_SIZE << order); |
4db7548c | 1218 | debug_check_no_obj_freed(page_address(page), |
e2769dbd | 1219 | PAGE_SIZE << order); |
4db7548c | 1220 | } |
6471384a AP |
1221 | if (want_init_on_free()) |
1222 | kernel_init_free_pages(page, 1 << order); | |
1223 | ||
e2769dbd | 1224 | kernel_poison_pages(page, 1 << order, 0); |
234fdce8 QC |
1225 | /* |
1226 | * arch_free_page() can make the page's contents inaccessible. s390 | |
1227 | * does this. So nothing which can access the page's contents should | |
1228 | * happen after this. | |
1229 | */ | |
1230 | arch_free_page(page, order); | |
1231 | ||
8e57f8ac | 1232 | if (debug_pagealloc_enabled_static()) |
d6332692 RE |
1233 | kernel_map_pages(page, 1 << order, 0); |
1234 | ||
3c0c12cc | 1235 | kasan_free_nondeferred_pages(page, order); |
4db7548c | 1236 | |
4db7548c MG |
1237 | return true; |
1238 | } | |
1239 | ||
e2769dbd | 1240 | #ifdef CONFIG_DEBUG_VM |
4462b32c VB |
1241 | /* |
1242 | * With DEBUG_VM enabled, order-0 pages are checked immediately when being freed | |
1243 | * to pcp lists. With debug_pagealloc also enabled, they are also rechecked when | |
1244 | * moved from pcp lists to free lists. | |
1245 | */ | |
1246 | static bool free_pcp_prepare(struct page *page) | |
e2769dbd MG |
1247 | { |
1248 | return free_pages_prepare(page, 0, true); | |
1249 | } | |
1250 | ||
4462b32c | 1251 | static bool bulkfree_pcp_prepare(struct page *page) |
e2769dbd | 1252 | { |
8e57f8ac | 1253 | if (debug_pagealloc_enabled_static()) |
534fe5e3 | 1254 | return check_free_page(page); |
4462b32c VB |
1255 | else |
1256 | return false; | |
e2769dbd MG |
1257 | } |
1258 | #else | |
4462b32c VB |
1259 | /* |
1260 | * With DEBUG_VM disabled, order-0 pages being freed are checked only when | |
1261 | * moving from pcp lists to free list in order to reduce overhead. With | |
1262 | * debug_pagealloc enabled, they are checked also immediately when being freed | |
1263 | * to the pcp lists. | |
1264 | */ | |
e2769dbd MG |
1265 | static bool free_pcp_prepare(struct page *page) |
1266 | { | |
8e57f8ac | 1267 | if (debug_pagealloc_enabled_static()) |
4462b32c VB |
1268 | return free_pages_prepare(page, 0, true); |
1269 | else | |
1270 | return free_pages_prepare(page, 0, false); | |
e2769dbd MG |
1271 | } |
1272 | ||
4db7548c MG |
1273 | static bool bulkfree_pcp_prepare(struct page *page) |
1274 | { | |
534fe5e3 | 1275 | return check_free_page(page); |
4db7548c MG |
1276 | } |
1277 | #endif /* CONFIG_DEBUG_VM */ | |
1278 | ||
97334162 AL |
1279 | static inline void prefetch_buddy(struct page *page) |
1280 | { | |
1281 | unsigned long pfn = page_to_pfn(page); | |
1282 | unsigned long buddy_pfn = __find_buddy_pfn(pfn, 0); | |
1283 | struct page *buddy = page + (buddy_pfn - pfn); | |
1284 | ||
1285 | prefetch(buddy); | |
1286 | } | |
1287 | ||
1da177e4 | 1288 | /* |
5f8dcc21 | 1289 | * Frees a number of pages from the PCP lists |
1da177e4 | 1290 | * Assumes all pages on list are in same zone, and of same order. |
207f36ee | 1291 | * count is the number of pages to free. |
1da177e4 LT |
1292 | * |
1293 | * If the zone was previously in an "all pages pinned" state then look to | |
1294 | * see if this freeing clears that state. | |
1295 | * | |
1296 | * And clear the zone's pages_scanned counter, to hold off the "all pages are | |
1297 | * pinned" detection logic. | |
1298 | */ | |
5f8dcc21 MG |
1299 | static void free_pcppages_bulk(struct zone *zone, int count, |
1300 | struct per_cpu_pages *pcp) | |
1da177e4 | 1301 | { |
5f8dcc21 | 1302 | int migratetype = 0; |
a6f9edd6 | 1303 | int batch_free = 0; |
97334162 | 1304 | int prefetch_nr = 0; |
3777999d | 1305 | bool isolated_pageblocks; |
0a5f4e5b AL |
1306 | struct page *page, *tmp; |
1307 | LIST_HEAD(head); | |
f2260e6b | 1308 | |
e5b31ac2 | 1309 | while (count) { |
5f8dcc21 MG |
1310 | struct list_head *list; |
1311 | ||
1312 | /* | |
a6f9edd6 MG |
1313 | * Remove pages from lists in a round-robin fashion. A |
1314 | * batch_free count is maintained that is incremented when an | |
1315 | * empty list is encountered. This is so more pages are freed | |
1316 | * off fuller lists instead of spinning excessively around empty | |
1317 | * lists | |
5f8dcc21 MG |
1318 | */ |
1319 | do { | |
a6f9edd6 | 1320 | batch_free++; |
5f8dcc21 MG |
1321 | if (++migratetype == MIGRATE_PCPTYPES) |
1322 | migratetype = 0; | |
1323 | list = &pcp->lists[migratetype]; | |
1324 | } while (list_empty(list)); | |
48db57f8 | 1325 | |
1d16871d NK |
1326 | /* This is the only non-empty list. Free them all. */ |
1327 | if (batch_free == MIGRATE_PCPTYPES) | |
e5b31ac2 | 1328 | batch_free = count; |
1d16871d | 1329 | |
a6f9edd6 | 1330 | do { |
a16601c5 | 1331 | page = list_last_entry(list, struct page, lru); |
0a5f4e5b | 1332 | /* must delete to avoid corrupting pcp list */ |
a6f9edd6 | 1333 | list_del(&page->lru); |
77ba9062 | 1334 | pcp->count--; |
aa016d14 | 1335 | |
4db7548c MG |
1336 | if (bulkfree_pcp_prepare(page)) |
1337 | continue; | |
1338 | ||
0a5f4e5b | 1339 | list_add_tail(&page->lru, &head); |
97334162 AL |
1340 | |
1341 | /* | |
1342 | * We are going to put the page back to the global | |
1343 | * pool, prefetch its buddy to speed up later access | |
1344 | * under zone->lock. It is believed the overhead of | |
1345 | * an additional test and calculating buddy_pfn here | |
1346 | * can be offset by reduced memory latency later. To | |
1347 | * avoid excessive prefetching due to large count, only | |
1348 | * prefetch buddy for the first pcp->batch nr of pages. | |
1349 | */ | |
1350 | if (prefetch_nr++ < pcp->batch) | |
1351 | prefetch_buddy(page); | |
e5b31ac2 | 1352 | } while (--count && --batch_free && !list_empty(list)); |
1da177e4 | 1353 | } |
0a5f4e5b AL |
1354 | |
1355 | spin_lock(&zone->lock); | |
1356 | isolated_pageblocks = has_isolate_pageblock(zone); | |
1357 | ||
1358 | /* | |
1359 | * Use safe version since after __free_one_page(), | |
1360 | * page->lru.next will not point to original list. | |
1361 | */ | |
1362 | list_for_each_entry_safe(page, tmp, &head, lru) { | |
1363 | int mt = get_pcppage_migratetype(page); | |
1364 | /* MIGRATE_ISOLATE page should not go to pcplists */ | |
1365 | VM_BUG_ON_PAGE(is_migrate_isolate(mt), page); | |
1366 | /* Pageblock could have been isolated meanwhile */ | |
1367 | if (unlikely(isolated_pageblocks)) | |
1368 | mt = get_pageblock_migratetype(page); | |
1369 | ||
36e66c55 | 1370 | __free_one_page(page, page_to_pfn(page), zone, 0, mt, true); |
0a5f4e5b AL |
1371 | trace_mm_page_pcpu_drain(page, 0, mt); |
1372 | } | |
d34b0733 | 1373 | spin_unlock(&zone->lock); |
1da177e4 LT |
1374 | } |
1375 | ||
dc4b0caf MG |
1376 | static void free_one_page(struct zone *zone, |
1377 | struct page *page, unsigned long pfn, | |
7aeb09f9 | 1378 | unsigned int order, |
ed0ae21d | 1379 | int migratetype) |
1da177e4 | 1380 | { |
d34b0733 | 1381 | spin_lock(&zone->lock); |
ad53f92e JK |
1382 | if (unlikely(has_isolate_pageblock(zone) || |
1383 | is_migrate_isolate(migratetype))) { | |
1384 | migratetype = get_pfnblock_migratetype(page, pfn); | |
ad53f92e | 1385 | } |
36e66c55 | 1386 | __free_one_page(page, pfn, zone, order, migratetype, true); |
d34b0733 | 1387 | spin_unlock(&zone->lock); |
48db57f8 NP |
1388 | } |
1389 | ||
1e8ce83c | 1390 | static void __meminit __init_single_page(struct page *page, unsigned long pfn, |
d0dc12e8 | 1391 | unsigned long zone, int nid) |
1e8ce83c | 1392 | { |
d0dc12e8 | 1393 | mm_zero_struct_page(page); |
1e8ce83c | 1394 | set_page_links(page, zone, nid, pfn); |
1e8ce83c RH |
1395 | init_page_count(page); |
1396 | page_mapcount_reset(page); | |
1397 | page_cpupid_reset_last(page); | |
2813b9c0 | 1398 | page_kasan_tag_reset(page); |
1e8ce83c | 1399 | |
1e8ce83c RH |
1400 | INIT_LIST_HEAD(&page->lru); |
1401 | #ifdef WANT_PAGE_VIRTUAL | |
1402 | /* The shift won't overflow because ZONE_NORMAL is below 4G. */ | |
1403 | if (!is_highmem_idx(zone)) | |
1404 | set_page_address(page, __va(pfn << PAGE_SHIFT)); | |
1405 | #endif | |
1406 | } | |
1407 | ||
7e18adb4 | 1408 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
57148a64 | 1409 | static void __meminit init_reserved_page(unsigned long pfn) |
7e18adb4 MG |
1410 | { |
1411 | pg_data_t *pgdat; | |
1412 | int nid, zid; | |
1413 | ||
1414 | if (!early_page_uninitialised(pfn)) | |
1415 | return; | |
1416 | ||
1417 | nid = early_pfn_to_nid(pfn); | |
1418 | pgdat = NODE_DATA(nid); | |
1419 | ||
1420 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
1421 | struct zone *zone = &pgdat->node_zones[zid]; | |
1422 | ||
1423 | if (pfn >= zone->zone_start_pfn && pfn < zone_end_pfn(zone)) | |
1424 | break; | |
1425 | } | |
d0dc12e8 | 1426 | __init_single_page(pfn_to_page(pfn), pfn, zid, nid); |
7e18adb4 MG |
1427 | } |
1428 | #else | |
1429 | static inline void init_reserved_page(unsigned long pfn) | |
1430 | { | |
1431 | } | |
1432 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ | |
1433 | ||
92923ca3 NZ |
1434 | /* |
1435 | * Initialised pages do not have PageReserved set. This function is | |
1436 | * called for each range allocated by the bootmem allocator and | |
1437 | * marks the pages PageReserved. The remaining valid pages are later | |
1438 | * sent to the buddy page allocator. | |
1439 | */ | |
4b50bcc7 | 1440 | void __meminit reserve_bootmem_region(phys_addr_t start, phys_addr_t end) |
92923ca3 NZ |
1441 | { |
1442 | unsigned long start_pfn = PFN_DOWN(start); | |
1443 | unsigned long end_pfn = PFN_UP(end); | |
1444 | ||
7e18adb4 MG |
1445 | for (; start_pfn < end_pfn; start_pfn++) { |
1446 | if (pfn_valid(start_pfn)) { | |
1447 | struct page *page = pfn_to_page(start_pfn); | |
1448 | ||
1449 | init_reserved_page(start_pfn); | |
1d798ca3 KS |
1450 | |
1451 | /* Avoid false-positive PageTail() */ | |
1452 | INIT_LIST_HEAD(&page->lru); | |
1453 | ||
d483da5b AD |
1454 | /* |
1455 | * no need for atomic set_bit because the struct | |
1456 | * page is not visible yet so nobody should | |
1457 | * access it yet. | |
1458 | */ | |
1459 | __SetPageReserved(page); | |
7e18adb4 MG |
1460 | } |
1461 | } | |
92923ca3 NZ |
1462 | } |
1463 | ||
ec95f53a KM |
1464 | static void __free_pages_ok(struct page *page, unsigned int order) |
1465 | { | |
d34b0733 | 1466 | unsigned long flags; |
95e34412 | 1467 | int migratetype; |
dc4b0caf | 1468 | unsigned long pfn = page_to_pfn(page); |
ec95f53a | 1469 | |
e2769dbd | 1470 | if (!free_pages_prepare(page, order, true)) |
ec95f53a KM |
1471 | return; |
1472 | ||
cfc47a28 | 1473 | migratetype = get_pfnblock_migratetype(page, pfn); |
d34b0733 MG |
1474 | local_irq_save(flags); |
1475 | __count_vm_events(PGFREE, 1 << order); | |
dc4b0caf | 1476 | free_one_page(page_zone(page), page, pfn, order, migratetype); |
d34b0733 | 1477 | local_irq_restore(flags); |
1da177e4 LT |
1478 | } |
1479 | ||
a9cd410a | 1480 | void __free_pages_core(struct page *page, unsigned int order) |
a226f6c8 | 1481 | { |
c3993076 | 1482 | unsigned int nr_pages = 1 << order; |
e2d0bd2b | 1483 | struct page *p = page; |
c3993076 | 1484 | unsigned int loop; |
a226f6c8 | 1485 | |
e2d0bd2b YL |
1486 | prefetchw(p); |
1487 | for (loop = 0; loop < (nr_pages - 1); loop++, p++) { | |
1488 | prefetchw(p + 1); | |
c3993076 JW |
1489 | __ClearPageReserved(p); |
1490 | set_page_count(p, 0); | |
a226f6c8 | 1491 | } |
e2d0bd2b YL |
1492 | __ClearPageReserved(p); |
1493 | set_page_count(p, 0); | |
c3993076 | 1494 | |
9705bea5 | 1495 | atomic_long_add(nr_pages, &page_zone(page)->managed_pages); |
c3993076 JW |
1496 | set_page_refcounted(page); |
1497 | __free_pages(page, order); | |
a226f6c8 DH |
1498 | } |
1499 | ||
3f08a302 | 1500 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
7ace9917 | 1501 | |
75a592a4 MG |
1502 | static struct mminit_pfnnid_cache early_pfnnid_cache __meminitdata; |
1503 | ||
6f24fbd3 MR |
1504 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID |
1505 | ||
1506 | /* | |
1507 | * Required by SPARSEMEM. Given a PFN, return what node the PFN is on. | |
1508 | */ | |
1509 | int __meminit __early_pfn_to_nid(unsigned long pfn, | |
1510 | struct mminit_pfnnid_cache *state) | |
75a592a4 | 1511 | { |
6f24fbd3 | 1512 | unsigned long start_pfn, end_pfn; |
75a592a4 MG |
1513 | int nid; |
1514 | ||
6f24fbd3 MR |
1515 | if (state->last_start <= pfn && pfn < state->last_end) |
1516 | return state->last_nid; | |
1517 | ||
1518 | nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn); | |
1519 | if (nid != NUMA_NO_NODE) { | |
1520 | state->last_start = start_pfn; | |
1521 | state->last_end = end_pfn; | |
1522 | state->last_nid = nid; | |
1523 | } | |
7ace9917 MG |
1524 | |
1525 | return nid; | |
75a592a4 | 1526 | } |
6f24fbd3 | 1527 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ |
75a592a4 | 1528 | |
75a592a4 | 1529 | int __meminit early_pfn_to_nid(unsigned long pfn) |
75a592a4 | 1530 | { |
7ace9917 | 1531 | static DEFINE_SPINLOCK(early_pfn_lock); |
75a592a4 MG |
1532 | int nid; |
1533 | ||
7ace9917 | 1534 | spin_lock(&early_pfn_lock); |
56ec43d8 | 1535 | nid = __early_pfn_to_nid(pfn, &early_pfnnid_cache); |
7ace9917 | 1536 | if (nid < 0) |
e4568d38 | 1537 | nid = first_online_node; |
7ace9917 | 1538 | spin_unlock(&early_pfn_lock); |
75a592a4 | 1539 | |
7ace9917 | 1540 | return nid; |
75a592a4 | 1541 | } |
3f08a302 | 1542 | #endif /* CONFIG_NEED_MULTIPLE_NODES */ |
75a592a4 | 1543 | |
7c2ee349 | 1544 | void __init memblock_free_pages(struct page *page, unsigned long pfn, |
3a80a7fa MG |
1545 | unsigned int order) |
1546 | { | |
1547 | if (early_page_uninitialised(pfn)) | |
1548 | return; | |
a9cd410a | 1549 | __free_pages_core(page, order); |
3a80a7fa MG |
1550 | } |
1551 | ||
7cf91a98 JK |
1552 | /* |
1553 | * Check that the whole (or subset of) a pageblock given by the interval of | |
1554 | * [start_pfn, end_pfn) is valid and within the same zone, before scanning it | |
1555 | * with the migration of free compaction scanner. The scanners then need to | |
1556 | * use only pfn_valid_within() check for arches that allow holes within | |
1557 | * pageblocks. | |
1558 | * | |
1559 | * Return struct page pointer of start_pfn, or NULL if checks were not passed. | |
1560 | * | |
1561 | * It's possible on some configurations to have a setup like node0 node1 node0 | |
1562 | * i.e. it's possible that all pages within a zones range of pages do not | |
1563 | * belong to a single zone. We assume that a border between node0 and node1 | |
1564 | * can occur within a single pageblock, but not a node0 node1 node0 | |
1565 | * interleaving within a single pageblock. It is therefore sufficient to check | |
1566 | * the first and last page of a pageblock and avoid checking each individual | |
1567 | * page in a pageblock. | |
1568 | */ | |
1569 | struct page *__pageblock_pfn_to_page(unsigned long start_pfn, | |
1570 | unsigned long end_pfn, struct zone *zone) | |
1571 | { | |
1572 | struct page *start_page; | |
1573 | struct page *end_page; | |
1574 | ||
1575 | /* end_pfn is one past the range we are checking */ | |
1576 | end_pfn--; | |
1577 | ||
1578 | if (!pfn_valid(start_pfn) || !pfn_valid(end_pfn)) | |
1579 | return NULL; | |
1580 | ||
2d070eab MH |
1581 | start_page = pfn_to_online_page(start_pfn); |
1582 | if (!start_page) | |
1583 | return NULL; | |
7cf91a98 JK |
1584 | |
1585 | if (page_zone(start_page) != zone) | |
1586 | return NULL; | |
1587 | ||
1588 | end_page = pfn_to_page(end_pfn); | |
1589 | ||
1590 | /* This gives a shorter code than deriving page_zone(end_page) */ | |
1591 | if (page_zone_id(start_page) != page_zone_id(end_page)) | |
1592 | return NULL; | |
1593 | ||
1594 | return start_page; | |
1595 | } | |
1596 | ||
1597 | void set_zone_contiguous(struct zone *zone) | |
1598 | { | |
1599 | unsigned long block_start_pfn = zone->zone_start_pfn; | |
1600 | unsigned long block_end_pfn; | |
1601 | ||
1602 | block_end_pfn = ALIGN(block_start_pfn + 1, pageblock_nr_pages); | |
1603 | for (; block_start_pfn < zone_end_pfn(zone); | |
1604 | block_start_pfn = block_end_pfn, | |
1605 | block_end_pfn += pageblock_nr_pages) { | |
1606 | ||
1607 | block_end_pfn = min(block_end_pfn, zone_end_pfn(zone)); | |
1608 | ||
1609 | if (!__pageblock_pfn_to_page(block_start_pfn, | |
1610 | block_end_pfn, zone)) | |
1611 | return; | |
e84fe99b | 1612 | cond_resched(); |
7cf91a98 JK |
1613 | } |
1614 | ||
1615 | /* We confirm that there is no hole */ | |
1616 | zone->contiguous = true; | |
1617 | } | |
1618 | ||
1619 | void clear_zone_contiguous(struct zone *zone) | |
1620 | { | |
1621 | zone->contiguous = false; | |
1622 | } | |
1623 | ||
7e18adb4 | 1624 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
2f47a91f PT |
1625 | static void __init deferred_free_range(unsigned long pfn, |
1626 | unsigned long nr_pages) | |
a4de83dd | 1627 | { |
2f47a91f PT |
1628 | struct page *page; |
1629 | unsigned long i; | |
a4de83dd | 1630 | |
2f47a91f | 1631 | if (!nr_pages) |
a4de83dd MG |
1632 | return; |
1633 | ||
2f47a91f PT |
1634 | page = pfn_to_page(pfn); |
1635 | ||
a4de83dd | 1636 | /* Free a large naturally-aligned chunk if possible */ |
e780149b XQ |
1637 | if (nr_pages == pageblock_nr_pages && |
1638 | (pfn & (pageblock_nr_pages - 1)) == 0) { | |
ac5d2539 | 1639 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
a9cd410a | 1640 | __free_pages_core(page, pageblock_order); |
a4de83dd MG |
1641 | return; |
1642 | } | |
1643 | ||
e780149b XQ |
1644 | for (i = 0; i < nr_pages; i++, page++, pfn++) { |
1645 | if ((pfn & (pageblock_nr_pages - 1)) == 0) | |
1646 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
a9cd410a | 1647 | __free_pages_core(page, 0); |
e780149b | 1648 | } |
a4de83dd MG |
1649 | } |
1650 | ||
d3cd131d NS |
1651 | /* Completion tracking for deferred_init_memmap() threads */ |
1652 | static atomic_t pgdat_init_n_undone __initdata; | |
1653 | static __initdata DECLARE_COMPLETION(pgdat_init_all_done_comp); | |
1654 | ||
1655 | static inline void __init pgdat_init_report_one_done(void) | |
1656 | { | |
1657 | if (atomic_dec_and_test(&pgdat_init_n_undone)) | |
1658 | complete(&pgdat_init_all_done_comp); | |
1659 | } | |
0e1cc95b | 1660 | |
2f47a91f | 1661 | /* |
80b1f41c PT |
1662 | * Returns true if page needs to be initialized or freed to buddy allocator. |
1663 | * | |
1664 | * First we check if pfn is valid on architectures where it is possible to have | |
1665 | * holes within pageblock_nr_pages. On systems where it is not possible, this | |
1666 | * function is optimized out. | |
1667 | * | |
1668 | * Then, we check if a current large page is valid by only checking the validity | |
1669 | * of the head pfn. | |
2f47a91f | 1670 | */ |
56ec43d8 | 1671 | static inline bool __init deferred_pfn_valid(unsigned long pfn) |
2f47a91f | 1672 | { |
80b1f41c PT |
1673 | if (!pfn_valid_within(pfn)) |
1674 | return false; | |
1675 | if (!(pfn & (pageblock_nr_pages - 1)) && !pfn_valid(pfn)) | |
1676 | return false; | |
80b1f41c PT |
1677 | return true; |
1678 | } | |
2f47a91f | 1679 | |
80b1f41c PT |
1680 | /* |
1681 | * Free pages to buddy allocator. Try to free aligned pages in | |
1682 | * pageblock_nr_pages sizes. | |
1683 | */ | |
56ec43d8 | 1684 | static void __init deferred_free_pages(unsigned long pfn, |
80b1f41c PT |
1685 | unsigned long end_pfn) |
1686 | { | |
80b1f41c PT |
1687 | unsigned long nr_pgmask = pageblock_nr_pages - 1; |
1688 | unsigned long nr_free = 0; | |
2f47a91f | 1689 | |
80b1f41c | 1690 | for (; pfn < end_pfn; pfn++) { |
56ec43d8 | 1691 | if (!deferred_pfn_valid(pfn)) { |
80b1f41c PT |
1692 | deferred_free_range(pfn - nr_free, nr_free); |
1693 | nr_free = 0; | |
1694 | } else if (!(pfn & nr_pgmask)) { | |
1695 | deferred_free_range(pfn - nr_free, nr_free); | |
1696 | nr_free = 1; | |
80b1f41c PT |
1697 | } else { |
1698 | nr_free++; | |
1699 | } | |
1700 | } | |
1701 | /* Free the last block of pages to allocator */ | |
1702 | deferred_free_range(pfn - nr_free, nr_free); | |
2f47a91f PT |
1703 | } |
1704 | ||
80b1f41c PT |
1705 | /* |
1706 | * Initialize struct pages. We minimize pfn page lookups and scheduler checks | |
1707 | * by performing it only once every pageblock_nr_pages. | |
1708 | * Return number of pages initialized. | |
1709 | */ | |
56ec43d8 | 1710 | static unsigned long __init deferred_init_pages(struct zone *zone, |
80b1f41c PT |
1711 | unsigned long pfn, |
1712 | unsigned long end_pfn) | |
2f47a91f | 1713 | { |
2f47a91f | 1714 | unsigned long nr_pgmask = pageblock_nr_pages - 1; |
56ec43d8 | 1715 | int nid = zone_to_nid(zone); |
2f47a91f | 1716 | unsigned long nr_pages = 0; |
56ec43d8 | 1717 | int zid = zone_idx(zone); |
2f47a91f | 1718 | struct page *page = NULL; |
2f47a91f | 1719 | |
80b1f41c | 1720 | for (; pfn < end_pfn; pfn++) { |
56ec43d8 | 1721 | if (!deferred_pfn_valid(pfn)) { |
80b1f41c | 1722 | page = NULL; |
2f47a91f | 1723 | continue; |
80b1f41c | 1724 | } else if (!page || !(pfn & nr_pgmask)) { |
2f47a91f | 1725 | page = pfn_to_page(pfn); |
80b1f41c PT |
1726 | } else { |
1727 | page++; | |
2f47a91f | 1728 | } |
d0dc12e8 | 1729 | __init_single_page(page, pfn, zid, nid); |
80b1f41c | 1730 | nr_pages++; |
2f47a91f | 1731 | } |
80b1f41c | 1732 | return (nr_pages); |
2f47a91f PT |
1733 | } |
1734 | ||
0e56acae AD |
1735 | /* |
1736 | * This function is meant to pre-load the iterator for the zone init. | |
1737 | * Specifically it walks through the ranges until we are caught up to the | |
1738 | * first_init_pfn value and exits there. If we never encounter the value we | |
1739 | * return false indicating there are no valid ranges left. | |
1740 | */ | |
1741 | static bool __init | |
1742 | deferred_init_mem_pfn_range_in_zone(u64 *i, struct zone *zone, | |
1743 | unsigned long *spfn, unsigned long *epfn, | |
1744 | unsigned long first_init_pfn) | |
1745 | { | |
1746 | u64 j; | |
1747 | ||
1748 | /* | |
1749 | * Start out by walking through the ranges in this zone that have | |
1750 | * already been initialized. We don't need to do anything with them | |
1751 | * so we just need to flush them out of the system. | |
1752 | */ | |
1753 | for_each_free_mem_pfn_range_in_zone(j, zone, spfn, epfn) { | |
1754 | if (*epfn <= first_init_pfn) | |
1755 | continue; | |
1756 | if (*spfn < first_init_pfn) | |
1757 | *spfn = first_init_pfn; | |
1758 | *i = j; | |
1759 | return true; | |
1760 | } | |
1761 | ||
1762 | return false; | |
1763 | } | |
1764 | ||
1765 | /* | |
1766 | * Initialize and free pages. We do it in two loops: first we initialize | |
1767 | * struct page, then free to buddy allocator, because while we are | |
1768 | * freeing pages we can access pages that are ahead (computing buddy | |
1769 | * page in __free_one_page()). | |
1770 | * | |
1771 | * In order to try and keep some memory in the cache we have the loop | |
1772 | * broken along max page order boundaries. This way we will not cause | |
1773 | * any issues with the buddy page computation. | |
1774 | */ | |
1775 | static unsigned long __init | |
1776 | deferred_init_maxorder(u64 *i, struct zone *zone, unsigned long *start_pfn, | |
1777 | unsigned long *end_pfn) | |
1778 | { | |
1779 | unsigned long mo_pfn = ALIGN(*start_pfn + 1, MAX_ORDER_NR_PAGES); | |
1780 | unsigned long spfn = *start_pfn, epfn = *end_pfn; | |
1781 | unsigned long nr_pages = 0; | |
1782 | u64 j = *i; | |
1783 | ||
1784 | /* First we loop through and initialize the page values */ | |
1785 | for_each_free_mem_pfn_range_in_zone_from(j, zone, start_pfn, end_pfn) { | |
1786 | unsigned long t; | |
1787 | ||
1788 | if (mo_pfn <= *start_pfn) | |
1789 | break; | |
1790 | ||
1791 | t = min(mo_pfn, *end_pfn); | |
1792 | nr_pages += deferred_init_pages(zone, *start_pfn, t); | |
1793 | ||
1794 | if (mo_pfn < *end_pfn) { | |
1795 | *start_pfn = mo_pfn; | |
1796 | break; | |
1797 | } | |
1798 | } | |
1799 | ||
1800 | /* Reset values and now loop through freeing pages as needed */ | |
1801 | swap(j, *i); | |
1802 | ||
1803 | for_each_free_mem_pfn_range_in_zone_from(j, zone, &spfn, &epfn) { | |
1804 | unsigned long t; | |
1805 | ||
1806 | if (mo_pfn <= spfn) | |
1807 | break; | |
1808 | ||
1809 | t = min(mo_pfn, epfn); | |
1810 | deferred_free_pages(spfn, t); | |
1811 | ||
1812 | if (mo_pfn <= epfn) | |
1813 | break; | |
1814 | } | |
1815 | ||
1816 | return nr_pages; | |
1817 | } | |
1818 | ||
e4443149 DJ |
1819 | static void __init |
1820 | deferred_init_memmap_chunk(unsigned long start_pfn, unsigned long end_pfn, | |
1821 | void *arg) | |
1822 | { | |
1823 | unsigned long spfn, epfn; | |
1824 | struct zone *zone = arg; | |
1825 | u64 i; | |
1826 | ||
1827 | deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, start_pfn); | |
1828 | ||
1829 | /* | |
1830 | * Initialize and free pages in MAX_ORDER sized increments so that we | |
1831 | * can avoid introducing any issues with the buddy allocator. | |
1832 | */ | |
1833 | while (spfn < end_pfn) { | |
1834 | deferred_init_maxorder(&i, zone, &spfn, &epfn); | |
1835 | cond_resched(); | |
1836 | } | |
1837 | } | |
1838 | ||
ecd09650 DJ |
1839 | /* An arch may override for more concurrency. */ |
1840 | __weak int __init | |
1841 | deferred_page_init_max_threads(const struct cpumask *node_cpumask) | |
1842 | { | |
1843 | return 1; | |
1844 | } | |
1845 | ||
7e18adb4 | 1846 | /* Initialise remaining memory on a node */ |
0e1cc95b | 1847 | static int __init deferred_init_memmap(void *data) |
7e18adb4 | 1848 | { |
0e1cc95b | 1849 | pg_data_t *pgdat = data; |
0e56acae | 1850 | const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id); |
89c7c402 | 1851 | unsigned long spfn = 0, epfn = 0; |
0e56acae | 1852 | unsigned long first_init_pfn, flags; |
7e18adb4 | 1853 | unsigned long start = jiffies; |
7e18adb4 | 1854 | struct zone *zone; |
e4443149 | 1855 | int zid, max_threads; |
2f47a91f | 1856 | u64 i; |
7e18adb4 | 1857 | |
3a2d7fa8 PT |
1858 | /* Bind memory initialisation thread to a local node if possible */ |
1859 | if (!cpumask_empty(cpumask)) | |
1860 | set_cpus_allowed_ptr(current, cpumask); | |
1861 | ||
1862 | pgdat_resize_lock(pgdat, &flags); | |
1863 | first_init_pfn = pgdat->first_deferred_pfn; | |
0e1cc95b | 1864 | if (first_init_pfn == ULONG_MAX) { |
3a2d7fa8 | 1865 | pgdat_resize_unlock(pgdat, &flags); |
d3cd131d | 1866 | pgdat_init_report_one_done(); |
0e1cc95b MG |
1867 | return 0; |
1868 | } | |
1869 | ||
7e18adb4 MG |
1870 | /* Sanity check boundaries */ |
1871 | BUG_ON(pgdat->first_deferred_pfn < pgdat->node_start_pfn); | |
1872 | BUG_ON(pgdat->first_deferred_pfn > pgdat_end_pfn(pgdat)); | |
1873 | pgdat->first_deferred_pfn = ULONG_MAX; | |
1874 | ||
3d060856 PT |
1875 | /* |
1876 | * Once we unlock here, the zone cannot be grown anymore, thus if an | |
1877 | * interrupt thread must allocate this early in boot, zone must be | |
1878 | * pre-grown prior to start of deferred page initialization. | |
1879 | */ | |
1880 | pgdat_resize_unlock(pgdat, &flags); | |
1881 | ||
7e18adb4 MG |
1882 | /* Only the highest zone is deferred so find it */ |
1883 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { | |
1884 | zone = pgdat->node_zones + zid; | |
1885 | if (first_init_pfn < zone_end_pfn(zone)) | |
1886 | break; | |
1887 | } | |
0e56acae AD |
1888 | |
1889 | /* If the zone is empty somebody else may have cleared out the zone */ | |
1890 | if (!deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, | |
1891 | first_init_pfn)) | |
1892 | goto zone_empty; | |
7e18adb4 | 1893 | |
ecd09650 | 1894 | max_threads = deferred_page_init_max_threads(cpumask); |
7e18adb4 | 1895 | |
117003c3 | 1896 | while (spfn < epfn) { |
e4443149 DJ |
1897 | unsigned long epfn_align = ALIGN(epfn, PAGES_PER_SECTION); |
1898 | struct padata_mt_job job = { | |
1899 | .thread_fn = deferred_init_memmap_chunk, | |
1900 | .fn_arg = zone, | |
1901 | .start = spfn, | |
1902 | .size = epfn_align - spfn, | |
1903 | .align = PAGES_PER_SECTION, | |
1904 | .min_chunk = PAGES_PER_SECTION, | |
1905 | .max_threads = max_threads, | |
1906 | }; | |
1907 | ||
1908 | padata_do_multithreaded(&job); | |
1909 | deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, | |
1910 | epfn_align); | |
117003c3 | 1911 | } |
0e56acae | 1912 | zone_empty: |
7e18adb4 MG |
1913 | /* Sanity check that the next zone really is unpopulated */ |
1914 | WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); | |
1915 | ||
89c7c402 DJ |
1916 | pr_info("node %d deferred pages initialised in %ums\n", |
1917 | pgdat->node_id, jiffies_to_msecs(jiffies - start)); | |
d3cd131d NS |
1918 | |
1919 | pgdat_init_report_one_done(); | |
0e1cc95b MG |
1920 | return 0; |
1921 | } | |
c9e97a19 | 1922 | |
c9e97a19 PT |
1923 | /* |
1924 | * If this zone has deferred pages, try to grow it by initializing enough | |
1925 | * deferred pages to satisfy the allocation specified by order, rounded up to | |
1926 | * the nearest PAGES_PER_SECTION boundary. So we're adding memory in increments | |
1927 | * of SECTION_SIZE bytes by initializing struct pages in increments of | |
1928 | * PAGES_PER_SECTION * sizeof(struct page) bytes. | |
1929 | * | |
1930 | * Return true when zone was grown, otherwise return false. We return true even | |
1931 | * when we grow less than requested, to let the caller decide if there are | |
1932 | * enough pages to satisfy the allocation. | |
1933 | * | |
1934 | * Note: We use noinline because this function is needed only during boot, and | |
1935 | * it is called from a __ref function _deferred_grow_zone. This way we are | |
1936 | * making sure that it is not inlined into permanent text section. | |
1937 | */ | |
1938 | static noinline bool __init | |
1939 | deferred_grow_zone(struct zone *zone, unsigned int order) | |
1940 | { | |
c9e97a19 | 1941 | unsigned long nr_pages_needed = ALIGN(1 << order, PAGES_PER_SECTION); |
837566e7 | 1942 | pg_data_t *pgdat = zone->zone_pgdat; |
c9e97a19 | 1943 | unsigned long first_deferred_pfn = pgdat->first_deferred_pfn; |
0e56acae AD |
1944 | unsigned long spfn, epfn, flags; |
1945 | unsigned long nr_pages = 0; | |
c9e97a19 PT |
1946 | u64 i; |
1947 | ||
1948 | /* Only the last zone may have deferred pages */ | |
1949 | if (zone_end_pfn(zone) != pgdat_end_pfn(pgdat)) | |
1950 | return false; | |
1951 | ||
1952 | pgdat_resize_lock(pgdat, &flags); | |
1953 | ||
c9e97a19 PT |
1954 | /* |
1955 | * If someone grew this zone while we were waiting for spinlock, return | |
1956 | * true, as there might be enough pages already. | |
1957 | */ | |
1958 | if (first_deferred_pfn != pgdat->first_deferred_pfn) { | |
1959 | pgdat_resize_unlock(pgdat, &flags); | |
1960 | return true; | |
1961 | } | |
1962 | ||
0e56acae AD |
1963 | /* If the zone is empty somebody else may have cleared out the zone */ |
1964 | if (!deferred_init_mem_pfn_range_in_zone(&i, zone, &spfn, &epfn, | |
1965 | first_deferred_pfn)) { | |
1966 | pgdat->first_deferred_pfn = ULONG_MAX; | |
c9e97a19 | 1967 | pgdat_resize_unlock(pgdat, &flags); |
b9705d87 JG |
1968 | /* Retry only once. */ |
1969 | return first_deferred_pfn != ULONG_MAX; | |
c9e97a19 PT |
1970 | } |
1971 | ||
0e56acae AD |
1972 | /* |
1973 | * Initialize and free pages in MAX_ORDER sized increments so | |
1974 | * that we can avoid introducing any issues with the buddy | |
1975 | * allocator. | |
1976 | */ | |
1977 | while (spfn < epfn) { | |
1978 | /* update our first deferred PFN for this section */ | |
1979 | first_deferred_pfn = spfn; | |
1980 | ||
1981 | nr_pages += deferred_init_maxorder(&i, zone, &spfn, &epfn); | |
117003c3 | 1982 | touch_nmi_watchdog(); |
c9e97a19 | 1983 | |
0e56acae AD |
1984 | /* We should only stop along section boundaries */ |
1985 | if ((first_deferred_pfn ^ spfn) < PAGES_PER_SECTION) | |
1986 | continue; | |
c9e97a19 | 1987 | |
0e56acae | 1988 | /* If our quota has been met we can stop here */ |
c9e97a19 PT |
1989 | if (nr_pages >= nr_pages_needed) |
1990 | break; | |
1991 | } | |
1992 | ||
0e56acae | 1993 | pgdat->first_deferred_pfn = spfn; |
c9e97a19 PT |
1994 | pgdat_resize_unlock(pgdat, &flags); |
1995 | ||
1996 | return nr_pages > 0; | |
1997 | } | |
1998 | ||
1999 | /* | |
2000 | * deferred_grow_zone() is __init, but it is called from | |
2001 | * get_page_from_freelist() during early boot until deferred_pages permanently | |
2002 | * disables this call. This is why we have refdata wrapper to avoid warning, | |
2003 | * and to ensure that the function body gets unloaded. | |
2004 | */ | |
2005 | static bool __ref | |
2006 | _deferred_grow_zone(struct zone *zone, unsigned int order) | |
2007 | { | |
2008 | return deferred_grow_zone(zone, order); | |
2009 | } | |
2010 | ||
7cf91a98 | 2011 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ |
0e1cc95b MG |
2012 | |
2013 | void __init page_alloc_init_late(void) | |
2014 | { | |
7cf91a98 | 2015 | struct zone *zone; |
e900a918 | 2016 | int nid; |
7cf91a98 JK |
2017 | |
2018 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT | |
0e1cc95b | 2019 | |
d3cd131d NS |
2020 | /* There will be num_node_state(N_MEMORY) threads */ |
2021 | atomic_set(&pgdat_init_n_undone, num_node_state(N_MEMORY)); | |
0e1cc95b | 2022 | for_each_node_state(nid, N_MEMORY) { |
0e1cc95b MG |
2023 | kthread_run(deferred_init_memmap, NODE_DATA(nid), "pgdatinit%d", nid); |
2024 | } | |
2025 | ||
2026 | /* Block until all are initialised */ | |
d3cd131d | 2027 | wait_for_completion(&pgdat_init_all_done_comp); |
4248b0da | 2028 | |
3e8fc007 MG |
2029 | /* |
2030 | * The number of managed pages has changed due to the initialisation | |
2031 | * so the pcpu batch and high limits needs to be updated or the limits | |
2032 | * will be artificially small. | |
2033 | */ | |
2034 | for_each_populated_zone(zone) | |
2035 | zone_pcp_update(zone); | |
2036 | ||
c9e97a19 PT |
2037 | /* |
2038 | * We initialized the rest of the deferred pages. Permanently disable | |
2039 | * on-demand struct page initialization. | |
2040 | */ | |
2041 | static_branch_disable(&deferred_pages); | |
2042 | ||
4248b0da MG |
2043 | /* Reinit limits that are based on free pages after the kernel is up */ |
2044 | files_maxfiles_init(); | |
7cf91a98 | 2045 | #endif |
350e88ba | 2046 | |
3010f876 PT |
2047 | /* Discard memblock private memory */ |
2048 | memblock_discard(); | |
7cf91a98 | 2049 | |
e900a918 DW |
2050 | for_each_node_state(nid, N_MEMORY) |
2051 | shuffle_free_memory(NODE_DATA(nid)); | |
2052 | ||
7cf91a98 JK |
2053 | for_each_populated_zone(zone) |
2054 | set_zone_contiguous(zone); | |
7e18adb4 | 2055 | } |
7e18adb4 | 2056 | |
47118af0 | 2057 | #ifdef CONFIG_CMA |
9cf510a5 | 2058 | /* Free whole pageblock and set its migration type to MIGRATE_CMA. */ |
47118af0 MN |
2059 | void __init init_cma_reserved_pageblock(struct page *page) |
2060 | { | |
2061 | unsigned i = pageblock_nr_pages; | |
2062 | struct page *p = page; | |
2063 | ||
2064 | do { | |
2065 | __ClearPageReserved(p); | |
2066 | set_page_count(p, 0); | |
d883c6cf | 2067 | } while (++p, --i); |
47118af0 | 2068 | |
47118af0 | 2069 | set_pageblock_migratetype(page, MIGRATE_CMA); |
dc78327c MN |
2070 | |
2071 | if (pageblock_order >= MAX_ORDER) { | |
2072 | i = pageblock_nr_pages; | |
2073 | p = page; | |
2074 | do { | |
2075 | set_page_refcounted(p); | |
2076 | __free_pages(p, MAX_ORDER - 1); | |
2077 | p += MAX_ORDER_NR_PAGES; | |
2078 | } while (i -= MAX_ORDER_NR_PAGES); | |
2079 | } else { | |
2080 | set_page_refcounted(page); | |
2081 | __free_pages(page, pageblock_order); | |
2082 | } | |
2083 | ||
3dcc0571 | 2084 | adjust_managed_page_count(page, pageblock_nr_pages); |
47118af0 MN |
2085 | } |
2086 | #endif | |
1da177e4 LT |
2087 | |
2088 | /* | |
2089 | * The order of subdivision here is critical for the IO subsystem. | |
2090 | * Please do not alter this order without good reasons and regression | |
2091 | * testing. Specifically, as large blocks of memory are subdivided, | |
2092 | * the order in which smaller blocks are delivered depends on the order | |
2093 | * they're subdivided in this function. This is the primary factor | |
2094 | * influencing the order in which pages are delivered to the IO | |
2095 | * subsystem according to empirical testing, and this is also justified | |
2096 | * by considering the behavior of a buddy system containing a single | |
2097 | * large block of memory acted on by a series of small allocations. | |
2098 | * This behavior is a critical factor in sglist merging's success. | |
2099 | * | |
6d49e352 | 2100 | * -- nyc |
1da177e4 | 2101 | */ |
085cc7d5 | 2102 | static inline void expand(struct zone *zone, struct page *page, |
6ab01363 | 2103 | int low, int high, int migratetype) |
1da177e4 LT |
2104 | { |
2105 | unsigned long size = 1 << high; | |
2106 | ||
2107 | while (high > low) { | |
1da177e4 LT |
2108 | high--; |
2109 | size >>= 1; | |
309381fe | 2110 | VM_BUG_ON_PAGE(bad_range(zone, &page[size]), &page[size]); |
c0a32fc5 | 2111 | |
acbc15a4 JK |
2112 | /* |
2113 | * Mark as guard pages (or page), that will allow to | |
2114 | * merge back to allocator when buddy will be freed. | |
2115 | * Corresponding page table entries will not be touched, | |
2116 | * pages will stay not present in virtual address space | |
2117 | */ | |
2118 | if (set_page_guard(zone, &page[size], high, migratetype)) | |
c0a32fc5 | 2119 | continue; |
acbc15a4 | 2120 | |
6ab01363 | 2121 | add_to_free_list(&page[size], zone, high, migratetype); |
1da177e4 LT |
2122 | set_page_order(&page[size], high); |
2123 | } | |
1da177e4 LT |
2124 | } |
2125 | ||
4e611801 | 2126 | static void check_new_page_bad(struct page *page) |
1da177e4 | 2127 | { |
f4c18e6f | 2128 | if (unlikely(page->flags & __PG_HWPOISON)) { |
e570f56c NH |
2129 | /* Don't complain about hwpoisoned pages */ |
2130 | page_mapcount_reset(page); /* remove PageBuddy */ | |
2131 | return; | |
f4c18e6f | 2132 | } |
58b7f119 WY |
2133 | |
2134 | bad_page(page, | |
2135 | page_bad_reason(page, PAGE_FLAGS_CHECK_AT_PREP)); | |
4e611801 VB |
2136 | } |
2137 | ||
2138 | /* | |
2139 | * This page is about to be returned from the page allocator | |
2140 | */ | |
2141 | static inline int check_new_page(struct page *page) | |
2142 | { | |
2143 | if (likely(page_expected_state(page, | |
2144 | PAGE_FLAGS_CHECK_AT_PREP|__PG_HWPOISON))) | |
2145 | return 0; | |
2146 | ||
2147 | check_new_page_bad(page); | |
2148 | return 1; | |
2a7684a2 WF |
2149 | } |
2150 | ||
bd33ef36 | 2151 | static inline bool free_pages_prezeroed(void) |
1414c7f4 | 2152 | { |
6471384a AP |
2153 | return (IS_ENABLED(CONFIG_PAGE_POISONING_ZERO) && |
2154 | page_poisoning_enabled()) || want_init_on_free(); | |
1414c7f4 LA |
2155 | } |
2156 | ||
479f854a | 2157 | #ifdef CONFIG_DEBUG_VM |
4462b32c VB |
2158 | /* |
2159 | * With DEBUG_VM enabled, order-0 pages are checked for expected state when | |
2160 | * being allocated from pcp lists. With debug_pagealloc also enabled, they are | |
2161 | * also checked when pcp lists are refilled from the free lists. | |
2162 | */ | |
2163 | static inline bool check_pcp_refill(struct page *page) | |
479f854a | 2164 | { |
8e57f8ac | 2165 | if (debug_pagealloc_enabled_static()) |
4462b32c VB |
2166 | return check_new_page(page); |
2167 | else | |
2168 | return false; | |
479f854a MG |
2169 | } |
2170 | ||
4462b32c | 2171 | static inline bool check_new_pcp(struct page *page) |
479f854a MG |
2172 | { |
2173 | return check_new_page(page); | |
2174 | } | |
2175 | #else | |
4462b32c VB |
2176 | /* |
2177 | * With DEBUG_VM disabled, free order-0 pages are checked for expected state | |
2178 | * when pcp lists are being refilled from the free lists. With debug_pagealloc | |
2179 | * enabled, they are also checked when being allocated from the pcp lists. | |
2180 | */ | |
2181 | static inline bool check_pcp_refill(struct page *page) | |
479f854a MG |
2182 | { |
2183 | return check_new_page(page); | |
2184 | } | |
4462b32c | 2185 | static inline bool check_new_pcp(struct page *page) |
479f854a | 2186 | { |
8e57f8ac | 2187 | if (debug_pagealloc_enabled_static()) |
4462b32c VB |
2188 | return check_new_page(page); |
2189 | else | |
2190 | return false; | |
479f854a MG |
2191 | } |
2192 | #endif /* CONFIG_DEBUG_VM */ | |
2193 | ||
2194 | static bool check_new_pages(struct page *page, unsigned int order) | |
2195 | { | |
2196 | int i; | |
2197 | for (i = 0; i < (1 << order); i++) { | |
2198 | struct page *p = page + i; | |
2199 | ||
2200 | if (unlikely(check_new_page(p))) | |
2201 | return true; | |
2202 | } | |
2203 | ||
2204 | return false; | |
2205 | } | |
2206 | ||
46f24fd8 JK |
2207 | inline void post_alloc_hook(struct page *page, unsigned int order, |
2208 | gfp_t gfp_flags) | |
2209 | { | |
2210 | set_page_private(page, 0); | |
2211 | set_page_refcounted(page); | |
2212 | ||
2213 | arch_alloc_page(page, order); | |
8e57f8ac | 2214 | if (debug_pagealloc_enabled_static()) |
d6332692 | 2215 | kernel_map_pages(page, 1 << order, 1); |
46f24fd8 | 2216 | kasan_alloc_pages(page, order); |
4117992d | 2217 | kernel_poison_pages(page, 1 << order, 1); |
46f24fd8 JK |
2218 | set_page_owner(page, order, gfp_flags); |
2219 | } | |
2220 | ||
479f854a | 2221 | static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags, |
c603844b | 2222 | unsigned int alloc_flags) |
2a7684a2 | 2223 | { |
46f24fd8 | 2224 | post_alloc_hook(page, order, gfp_flags); |
17cf4406 | 2225 | |
6471384a AP |
2226 | if (!free_pages_prezeroed() && want_init_on_alloc(gfp_flags)) |
2227 | kernel_init_free_pages(page, 1 << order); | |
17cf4406 NP |
2228 | |
2229 | if (order && (gfp_flags & __GFP_COMP)) | |
2230 | prep_compound_page(page, order); | |
2231 | ||
75379191 | 2232 | /* |
2f064f34 | 2233 | * page is set pfmemalloc when ALLOC_NO_WATERMARKS was necessary to |
75379191 VB |
2234 | * allocate the page. The expectation is that the caller is taking |
2235 | * steps that will free more memory. The caller should avoid the page | |
2236 | * being used for !PFMEMALLOC purposes. | |
2237 | */ | |
2f064f34 MH |
2238 | if (alloc_flags & ALLOC_NO_WATERMARKS) |
2239 | set_page_pfmemalloc(page); | |
2240 | else | |
2241 | clear_page_pfmemalloc(page); | |
1da177e4 LT |
2242 | } |
2243 | ||
56fd56b8 MG |
2244 | /* |
2245 | * Go through the free lists for the given migratetype and remove | |
2246 | * the smallest available page from the freelists | |
2247 | */ | |
85ccc8fa | 2248 | static __always_inline |
728ec980 | 2249 | struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, |
56fd56b8 MG |
2250 | int migratetype) |
2251 | { | |
2252 | unsigned int current_order; | |
b8af2941 | 2253 | struct free_area *area; |
56fd56b8 MG |
2254 | struct page *page; |
2255 | ||
2256 | /* Find a page of the appropriate size in the preferred list */ | |
2257 | for (current_order = order; current_order < MAX_ORDER; ++current_order) { | |
2258 | area = &(zone->free_area[current_order]); | |
b03641af | 2259 | page = get_page_from_free_area(area, migratetype); |
a16601c5 GT |
2260 | if (!page) |
2261 | continue; | |
6ab01363 AD |
2262 | del_page_from_free_list(page, zone, current_order); |
2263 | expand(zone, page, order, current_order, migratetype); | |
bb14c2c7 | 2264 | set_pcppage_migratetype(page, migratetype); |
56fd56b8 MG |
2265 | return page; |
2266 | } | |
2267 | ||
2268 | return NULL; | |
2269 | } | |
2270 | ||
2271 | ||
b2a0ac88 MG |
2272 | /* |
2273 | * This array describes the order lists are fallen back to when | |
2274 | * the free lists for the desirable migrate type are depleted | |
2275 | */ | |
47118af0 | 2276 | static int fallbacks[MIGRATE_TYPES][4] = { |
974a786e | 2277 | [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, |
974a786e | 2278 | [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_TYPES }, |
7ead3342 | 2279 | [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, |
47118af0 | 2280 | #ifdef CONFIG_CMA |
974a786e | 2281 | [MIGRATE_CMA] = { MIGRATE_TYPES }, /* Never used */ |
47118af0 | 2282 | #endif |
194159fb | 2283 | #ifdef CONFIG_MEMORY_ISOLATION |
974a786e | 2284 | [MIGRATE_ISOLATE] = { MIGRATE_TYPES }, /* Never used */ |
194159fb | 2285 | #endif |
b2a0ac88 MG |
2286 | }; |
2287 | ||
dc67647b | 2288 | #ifdef CONFIG_CMA |
85ccc8fa | 2289 | static __always_inline struct page *__rmqueue_cma_fallback(struct zone *zone, |
dc67647b JK |
2290 | unsigned int order) |
2291 | { | |
2292 | return __rmqueue_smallest(zone, order, MIGRATE_CMA); | |
2293 | } | |
2294 | #else | |
2295 | static inline struct page *__rmqueue_cma_fallback(struct zone *zone, | |
2296 | unsigned int order) { return NULL; } | |
2297 | #endif | |
2298 | ||
c361be55 MG |
2299 | /* |
2300 | * Move the free pages in a range to the free lists of the requested type. | |
d9c23400 | 2301 | * Note that start_page and end_pages are not aligned on a pageblock |
c361be55 MG |
2302 | * boundary. If alignment is required, use move_freepages_block() |
2303 | */ | |
02aa0cdd | 2304 | static int move_freepages(struct zone *zone, |
b69a7288 | 2305 | struct page *start_page, struct page *end_page, |
02aa0cdd | 2306 | int migratetype, int *num_movable) |
c361be55 MG |
2307 | { |
2308 | struct page *page; | |
d00181b9 | 2309 | unsigned int order; |
d100313f | 2310 | int pages_moved = 0; |
c361be55 | 2311 | |
c361be55 MG |
2312 | for (page = start_page; page <= end_page;) { |
2313 | if (!pfn_valid_within(page_to_pfn(page))) { | |
2314 | page++; | |
2315 | continue; | |
2316 | } | |
2317 | ||
2318 | if (!PageBuddy(page)) { | |
02aa0cdd VB |
2319 | /* |
2320 | * We assume that pages that could be isolated for | |
2321 | * migration are movable. But we don't actually try | |
2322 | * isolating, as that would be expensive. | |
2323 | */ | |
2324 | if (num_movable && | |
2325 | (PageLRU(page) || __PageMovable(page))) | |
2326 | (*num_movable)++; | |
2327 | ||
c361be55 MG |
2328 | page++; |
2329 | continue; | |
2330 | } | |
2331 | ||
cd961038 DR |
2332 | /* Make sure we are not inadvertently changing nodes */ |
2333 | VM_BUG_ON_PAGE(page_to_nid(page) != zone_to_nid(zone), page); | |
2334 | VM_BUG_ON_PAGE(page_zone(page) != zone, page); | |
2335 | ||
c361be55 | 2336 | order = page_order(page); |
6ab01363 | 2337 | move_to_free_list(page, zone, order, migratetype); |
c361be55 | 2338 | page += 1 << order; |
d100313f | 2339 | pages_moved += 1 << order; |
c361be55 MG |
2340 | } |
2341 | ||
d100313f | 2342 | return pages_moved; |
c361be55 MG |
2343 | } |
2344 | ||
ee6f509c | 2345 | int move_freepages_block(struct zone *zone, struct page *page, |
02aa0cdd | 2346 | int migratetype, int *num_movable) |
c361be55 MG |
2347 | { |
2348 | unsigned long start_pfn, end_pfn; | |
2349 | struct page *start_page, *end_page; | |
2350 | ||
4a222127 DR |
2351 | if (num_movable) |
2352 | *num_movable = 0; | |
2353 | ||
c361be55 | 2354 | start_pfn = page_to_pfn(page); |
d9c23400 | 2355 | start_pfn = start_pfn & ~(pageblock_nr_pages-1); |
c361be55 | 2356 | start_page = pfn_to_page(start_pfn); |
d9c23400 MG |
2357 | end_page = start_page + pageblock_nr_pages - 1; |
2358 | end_pfn = start_pfn + pageblock_nr_pages - 1; | |
c361be55 MG |
2359 | |
2360 | /* Do not cross zone boundaries */ | |
108bcc96 | 2361 | if (!zone_spans_pfn(zone, start_pfn)) |
c361be55 | 2362 | start_page = page; |
108bcc96 | 2363 | if (!zone_spans_pfn(zone, end_pfn)) |
c361be55 MG |
2364 | return 0; |
2365 | ||
02aa0cdd VB |
2366 | return move_freepages(zone, start_page, end_page, migratetype, |
2367 | num_movable); | |
c361be55 MG |
2368 | } |
2369 | ||
2f66a68f MG |
2370 | static void change_pageblock_range(struct page *pageblock_page, |
2371 | int start_order, int migratetype) | |
2372 | { | |
2373 | int nr_pageblocks = 1 << (start_order - pageblock_order); | |
2374 | ||
2375 | while (nr_pageblocks--) { | |
2376 | set_pageblock_migratetype(pageblock_page, migratetype); | |
2377 | pageblock_page += pageblock_nr_pages; | |
2378 | } | |
2379 | } | |
2380 | ||
fef903ef | 2381 | /* |
9c0415eb VB |
2382 | * When we are falling back to another migratetype during allocation, try to |
2383 | * steal extra free pages from the same pageblocks to satisfy further | |
2384 | * allocations, instead of polluting multiple pageblocks. | |
2385 | * | |
2386 | * If we are stealing a relatively large buddy page, it is likely there will | |
2387 | * be more free pages in the pageblock, so try to steal them all. For | |
2388 | * reclaimable and unmovable allocations, we steal regardless of page size, | |
2389 | * as fragmentation caused by those allocations polluting movable pageblocks | |
2390 | * is worse than movable allocations stealing from unmovable and reclaimable | |
2391 | * pageblocks. | |
fef903ef | 2392 | */ |
4eb7dce6 JK |
2393 | static bool can_steal_fallback(unsigned int order, int start_mt) |
2394 | { | |
2395 | /* | |
2396 | * Leaving this order check is intended, although there is | |
2397 | * relaxed order check in next check. The reason is that | |
2398 | * we can actually steal whole pageblock if this condition met, | |
2399 | * but, below check doesn't guarantee it and that is just heuristic | |
2400 | * so could be changed anytime. | |
2401 | */ | |
2402 | if (order >= pageblock_order) | |
2403 | return true; | |
2404 | ||
2405 | if (order >= pageblock_order / 2 || | |
2406 | start_mt == MIGRATE_RECLAIMABLE || | |
2407 | start_mt == MIGRATE_UNMOVABLE || | |
2408 | page_group_by_mobility_disabled) | |
2409 | return true; | |
2410 | ||
2411 | return false; | |
2412 | } | |
2413 | ||
1c30844d MG |
2414 | static inline void boost_watermark(struct zone *zone) |
2415 | { | |
2416 | unsigned long max_boost; | |
2417 | ||
2418 | if (!watermark_boost_factor) | |
2419 | return; | |
14f69140 HW |
2420 | /* |
2421 | * Don't bother in zones that are unlikely to produce results. | |
2422 | * On small machines, including kdump capture kernels running | |
2423 | * in a small area, boosting the watermark can cause an out of | |
2424 | * memory situation immediately. | |
2425 | */ | |
2426 | if ((pageblock_nr_pages * 4) > zone_managed_pages(zone)) | |
2427 | return; | |
1c30844d MG |
2428 | |
2429 | max_boost = mult_frac(zone->_watermark[WMARK_HIGH], | |
2430 | watermark_boost_factor, 10000); | |
94b3334c MG |
2431 | |
2432 | /* | |
2433 | * high watermark may be uninitialised if fragmentation occurs | |
2434 | * very early in boot so do not boost. We do not fall | |
2435 | * through and boost by pageblock_nr_pages as failing | |
2436 | * allocations that early means that reclaim is not going | |
2437 | * to help and it may even be impossible to reclaim the | |
2438 | * boosted watermark resulting in a hang. | |
2439 | */ | |
2440 | if (!max_boost) | |
2441 | return; | |
2442 | ||
1c30844d MG |
2443 | max_boost = max(pageblock_nr_pages, max_boost); |
2444 | ||
2445 | zone->watermark_boost = min(zone->watermark_boost + pageblock_nr_pages, | |
2446 | max_boost); | |
2447 | } | |
2448 | ||
4eb7dce6 JK |
2449 | /* |
2450 | * This function implements actual steal behaviour. If order is large enough, | |
2451 | * we can steal whole pageblock. If not, we first move freepages in this | |
02aa0cdd VB |
2452 | * pageblock to our migratetype and determine how many already-allocated pages |
2453 | * are there in the pageblock with a compatible migratetype. If at least half | |
2454 | * of pages are free or compatible, we can change migratetype of the pageblock | |
2455 | * itself, so pages freed in the future will be put on the correct free list. | |
4eb7dce6 JK |
2456 | */ |
2457 | static void steal_suitable_fallback(struct zone *zone, struct page *page, | |
1c30844d | 2458 | unsigned int alloc_flags, int start_type, bool whole_block) |
fef903ef | 2459 | { |
d00181b9 | 2460 | unsigned int current_order = page_order(page); |
02aa0cdd VB |
2461 | int free_pages, movable_pages, alike_pages; |
2462 | int old_block_type; | |
2463 | ||
2464 | old_block_type = get_pageblock_migratetype(page); | |
fef903ef | 2465 | |
3bc48f96 VB |
2466 | /* |
2467 | * This can happen due to races and we want to prevent broken | |
2468 | * highatomic accounting. | |
2469 | */ | |
02aa0cdd | 2470 | if (is_migrate_highatomic(old_block_type)) |
3bc48f96 VB |
2471 | goto single_page; |
2472 | ||
fef903ef SB |
2473 | /* Take ownership for orders >= pageblock_order */ |
2474 | if (current_order >= pageblock_order) { | |
2475 | change_pageblock_range(page, current_order, start_type); | |
3bc48f96 | 2476 | goto single_page; |
fef903ef SB |
2477 | } |
2478 | ||
1c30844d MG |
2479 | /* |
2480 | * Boost watermarks to increase reclaim pressure to reduce the | |
2481 | * likelihood of future fallbacks. Wake kswapd now as the node | |
2482 | * may be balanced overall and kswapd will not wake naturally. | |
2483 | */ | |
2484 | boost_watermark(zone); | |
2485 | if (alloc_flags & ALLOC_KSWAPD) | |
73444bc4 | 2486 | set_bit(ZONE_BOOSTED_WATERMARK, &zone->flags); |
1c30844d | 2487 | |
3bc48f96 VB |
2488 | /* We are not allowed to try stealing from the whole block */ |
2489 | if (!whole_block) | |
2490 | goto single_page; | |
2491 | ||
02aa0cdd VB |
2492 | free_pages = move_freepages_block(zone, page, start_type, |
2493 | &movable_pages); | |
2494 | /* | |
2495 | * Determine how many pages are compatible with our allocation. | |
2496 | * For movable allocation, it's the number of movable pages which | |
2497 | * we just obtained. For other types it's a bit more tricky. | |
2498 | */ | |
2499 | if (start_type == MIGRATE_MOVABLE) { | |
2500 | alike_pages = movable_pages; | |
2501 | } else { | |
2502 | /* | |
2503 | * If we are falling back a RECLAIMABLE or UNMOVABLE allocation | |
2504 | * to MOVABLE pageblock, consider all non-movable pages as | |
2505 | * compatible. If it's UNMOVABLE falling back to RECLAIMABLE or | |
2506 | * vice versa, be conservative since we can't distinguish the | |
2507 | * exact migratetype of non-movable pages. | |
2508 | */ | |
2509 | if (old_block_type == MIGRATE_MOVABLE) | |
2510 | alike_pages = pageblock_nr_pages | |
2511 | - (free_pages + movable_pages); | |
2512 | else | |
2513 | alike_pages = 0; | |
2514 | } | |
2515 | ||
3bc48f96 | 2516 | /* moving whole block can fail due to zone boundary conditions */ |
02aa0cdd | 2517 | if (!free_pages) |
3bc48f96 | 2518 | goto single_page; |
fef903ef | 2519 | |
02aa0cdd VB |
2520 | /* |
2521 | * If a sufficient number of pages in the block are either free or of | |
2522 | * comparable migratability as our allocation, claim the whole block. | |
2523 | */ | |
2524 | if (free_pages + alike_pages >= (1 << (pageblock_order-1)) || | |
4eb7dce6 JK |
2525 | page_group_by_mobility_disabled) |
2526 | set_pageblock_migratetype(page, start_type); | |
3bc48f96 VB |
2527 | |
2528 | return; | |
2529 | ||
2530 | single_page: | |
6ab01363 | 2531 | move_to_free_list(page, zone, current_order, start_type); |
4eb7dce6 JK |
2532 | } |
2533 | ||
2149cdae JK |
2534 | /* |
2535 | * Check whether there is a suitable fallback freepage with requested order. | |
2536 | * If only_stealable is true, this function returns fallback_mt only if | |
2537 | * we can steal other freepages all together. This would help to reduce | |
2538 | * fragmentation due to mixed migratetype pages in one pageblock. | |
2539 | */ | |
2540 | int find_suitable_fallback(struct free_area *area, unsigned int order, | |
2541 | int migratetype, bool only_stealable, bool *can_steal) | |
4eb7dce6 JK |
2542 | { |
2543 | int i; | |
2544 | int fallback_mt; | |
2545 | ||
2546 | if (area->nr_free == 0) | |
2547 | return -1; | |
2548 | ||
2549 | *can_steal = false; | |
2550 | for (i = 0;; i++) { | |
2551 | fallback_mt = fallbacks[migratetype][i]; | |
974a786e | 2552 | if (fallback_mt == MIGRATE_TYPES) |
4eb7dce6 JK |
2553 | break; |
2554 | ||
b03641af | 2555 | if (free_area_empty(area, fallback_mt)) |
4eb7dce6 | 2556 | continue; |
fef903ef | 2557 | |
4eb7dce6 JK |
2558 | if (can_steal_fallback(order, migratetype)) |
2559 | *can_steal = true; | |
2560 | ||
2149cdae JK |
2561 | if (!only_stealable) |
2562 | return fallback_mt; | |
2563 | ||
2564 | if (*can_steal) | |
2565 | return fallback_mt; | |
fef903ef | 2566 | } |
4eb7dce6 JK |
2567 | |
2568 | return -1; | |
fef903ef SB |
2569 | } |
2570 | ||
0aaa29a5 MG |
2571 | /* |
2572 | * Reserve a pageblock for exclusive use of high-order atomic allocations if | |
2573 | * there are no empty page blocks that contain a page with a suitable order | |
2574 | */ | |
2575 | static void reserve_highatomic_pageblock(struct page *page, struct zone *zone, | |
2576 | unsigned int alloc_order) | |
2577 | { | |
2578 | int mt; | |
2579 | unsigned long max_managed, flags; | |
2580 | ||
2581 | /* | |
2582 | * Limit the number reserved to 1 pageblock or roughly 1% of a zone. | |
2583 | * Check is race-prone but harmless. | |
2584 | */ | |
9705bea5 | 2585 | max_managed = (zone_managed_pages(zone) / 100) + pageblock_nr_pages; |
0aaa29a5 MG |
2586 | if (zone->nr_reserved_highatomic >= max_managed) |
2587 | return; | |
2588 | ||
2589 | spin_lock_irqsave(&zone->lock, flags); | |
2590 | ||
2591 | /* Recheck the nr_reserved_highatomic limit under the lock */ | |
2592 | if (zone->nr_reserved_highatomic >= max_managed) | |
2593 | goto out_unlock; | |
2594 | ||
2595 | /* Yoink! */ | |
2596 | mt = get_pageblock_migratetype(page); | |
a6ffdc07 XQ |
2597 | if (!is_migrate_highatomic(mt) && !is_migrate_isolate(mt) |
2598 | && !is_migrate_cma(mt)) { | |
0aaa29a5 MG |
2599 | zone->nr_reserved_highatomic += pageblock_nr_pages; |
2600 | set_pageblock_migratetype(page, MIGRATE_HIGHATOMIC); | |
02aa0cdd | 2601 | move_freepages_block(zone, page, MIGRATE_HIGHATOMIC, NULL); |
0aaa29a5 MG |
2602 | } |
2603 | ||
2604 | out_unlock: | |
2605 | spin_unlock_irqrestore(&zone->lock, flags); | |
2606 | } | |
2607 | ||
2608 | /* | |
2609 | * Used when an allocation is about to fail under memory pressure. This | |
2610 | * potentially hurts the reliability of high-order allocations when under | |
2611 | * intense memory pressure but failed atomic allocations should be easier | |
2612 | * to recover from than an OOM. | |
29fac03b MK |
2613 | * |
2614 | * If @force is true, try to unreserve a pageblock even though highatomic | |
2615 | * pageblock is exhausted. | |
0aaa29a5 | 2616 | */ |
29fac03b MK |
2617 | static bool unreserve_highatomic_pageblock(const struct alloc_context *ac, |
2618 | bool force) | |
0aaa29a5 MG |
2619 | { |
2620 | struct zonelist *zonelist = ac->zonelist; | |
2621 | unsigned long flags; | |
2622 | struct zoneref *z; | |
2623 | struct zone *zone; | |
2624 | struct page *page; | |
2625 | int order; | |
04c8716f | 2626 | bool ret; |
0aaa29a5 | 2627 | |
97a225e6 | 2628 | for_each_zone_zonelist_nodemask(zone, z, zonelist, ac->highest_zoneidx, |
0aaa29a5 | 2629 | ac->nodemask) { |
29fac03b MK |
2630 | /* |
2631 | * Preserve at least one pageblock unless memory pressure | |
2632 | * is really high. | |
2633 | */ | |
2634 | if (!force && zone->nr_reserved_highatomic <= | |
2635 | pageblock_nr_pages) | |
0aaa29a5 MG |
2636 | continue; |
2637 | ||
2638 | spin_lock_irqsave(&zone->lock, flags); | |
2639 | for (order = 0; order < MAX_ORDER; order++) { | |
2640 | struct free_area *area = &(zone->free_area[order]); | |
2641 | ||
b03641af | 2642 | page = get_page_from_free_area(area, MIGRATE_HIGHATOMIC); |
a16601c5 | 2643 | if (!page) |
0aaa29a5 MG |
2644 | continue; |
2645 | ||
0aaa29a5 | 2646 | /* |
4855e4a7 MK |
2647 | * In page freeing path, migratetype change is racy so |
2648 | * we can counter several free pages in a pageblock | |
2649 | * in this loop althoug we changed the pageblock type | |
2650 | * from highatomic to ac->migratetype. So we should | |
2651 | * adjust the count once. | |
0aaa29a5 | 2652 | */ |
a6ffdc07 | 2653 | if (is_migrate_highatomic_page(page)) { |
4855e4a7 MK |
2654 | /* |
2655 | * It should never happen but changes to | |
2656 | * locking could inadvertently allow a per-cpu | |
2657 | * drain to add pages to MIGRATE_HIGHATOMIC | |
2658 | * while unreserving so be safe and watch for | |
2659 | * underflows. | |
2660 | */ | |
2661 | zone->nr_reserved_highatomic -= min( | |
2662 | pageblock_nr_pages, | |
2663 | zone->nr_reserved_highatomic); | |
2664 | } | |
0aaa29a5 MG |
2665 | |
2666 | /* | |
2667 | * Convert to ac->migratetype and avoid the normal | |
2668 | * pageblock stealing heuristics. Minimally, the caller | |
2669 | * is doing the work and needs the pages. More | |
2670 | * importantly, if the block was always converted to | |
2671 | * MIGRATE_UNMOVABLE or another type then the number | |
2672 | * of pageblocks that cannot be completely freed | |
2673 | * may increase. | |
2674 | */ | |
2675 | set_pageblock_migratetype(page, ac->migratetype); | |
02aa0cdd VB |
2676 | ret = move_freepages_block(zone, page, ac->migratetype, |
2677 | NULL); | |
29fac03b MK |
2678 | if (ret) { |
2679 | spin_unlock_irqrestore(&zone->lock, flags); | |
2680 | return ret; | |
2681 | } | |
0aaa29a5 MG |
2682 | } |
2683 | spin_unlock_irqrestore(&zone->lock, flags); | |
2684 | } | |
04c8716f MK |
2685 | |
2686 | return false; | |
0aaa29a5 MG |
2687 | } |
2688 | ||
3bc48f96 VB |
2689 | /* |
2690 | * Try finding a free buddy page on the fallback list and put it on the free | |
2691 | * list of requested migratetype, possibly along with other pages from the same | |
2692 | * block, depending on fragmentation avoidance heuristics. Returns true if | |
2693 | * fallback was found so that __rmqueue_smallest() can grab it. | |
b002529d RV |
2694 | * |
2695 | * The use of signed ints for order and current_order is a deliberate | |
2696 | * deviation from the rest of this file, to make the for loop | |
2697 | * condition simpler. | |
3bc48f96 | 2698 | */ |
85ccc8fa | 2699 | static __always_inline bool |
6bb15450 MG |
2700 | __rmqueue_fallback(struct zone *zone, int order, int start_migratetype, |
2701 | unsigned int alloc_flags) | |
b2a0ac88 | 2702 | { |
b8af2941 | 2703 | struct free_area *area; |
b002529d | 2704 | int current_order; |
6bb15450 | 2705 | int min_order = order; |
b2a0ac88 | 2706 | struct page *page; |
4eb7dce6 JK |
2707 | int fallback_mt; |
2708 | bool can_steal; | |
b2a0ac88 | 2709 | |
6bb15450 MG |
2710 | /* |
2711 | * Do not steal pages from freelists belonging to other pageblocks | |
2712 | * i.e. orders < pageblock_order. If there are no local zones free, | |
2713 | * the zonelists will be reiterated without ALLOC_NOFRAGMENT. | |
2714 | */ | |
2715 | if (alloc_flags & ALLOC_NOFRAGMENT) | |
2716 | min_order = pageblock_order; | |
2717 | ||
7a8f58f3 VB |
2718 | /* |
2719 | * Find the largest available free page in the other list. This roughly | |
2720 | * approximates finding the pageblock with the most free pages, which | |
2721 | * would be too costly to do exactly. | |
2722 | */ | |
6bb15450 | 2723 | for (current_order = MAX_ORDER - 1; current_order >= min_order; |
7aeb09f9 | 2724 | --current_order) { |
4eb7dce6 JK |
2725 | area = &(zone->free_area[current_order]); |
2726 | fallback_mt = find_suitable_fallback(area, current_order, | |
2149cdae | 2727 | start_migratetype, false, &can_steal); |
4eb7dce6 JK |
2728 | if (fallback_mt == -1) |
2729 | continue; | |
b2a0ac88 | 2730 | |
7a8f58f3 VB |
2731 | /* |
2732 | * We cannot steal all free pages from the pageblock and the | |
2733 | * requested migratetype is movable. In that case it's better to | |
2734 | * steal and split the smallest available page instead of the | |
2735 | * largest available page, because even if the next movable | |
2736 | * allocation falls back into a different pageblock than this | |
2737 | * one, it won't cause permanent fragmentation. | |
2738 | */ | |
2739 | if (!can_steal && start_migratetype == MIGRATE_MOVABLE | |
2740 | && current_order > order) | |
2741 | goto find_smallest; | |
b2a0ac88 | 2742 | |
7a8f58f3 VB |
2743 | goto do_steal; |
2744 | } | |
e0fff1bd | 2745 | |
7a8f58f3 | 2746 | return false; |
e0fff1bd | 2747 | |
7a8f58f3 VB |
2748 | find_smallest: |
2749 | for (current_order = order; current_order < MAX_ORDER; | |
2750 | current_order++) { | |
2751 | area = &(zone->free_area[current_order]); | |
2752 | fallback_mt = find_suitable_fallback(area, current_order, | |
2753 | start_migratetype, false, &can_steal); | |
2754 | if (fallback_mt != -1) | |
2755 | break; | |
b2a0ac88 MG |
2756 | } |
2757 | ||
7a8f58f3 VB |
2758 | /* |
2759 | * This should not happen - we already found a suitable fallback | |
2760 | * when looking for the largest page. | |
2761 | */ | |
2762 | VM_BUG_ON(current_order == MAX_ORDER); | |
2763 | ||
2764 | do_steal: | |
b03641af | 2765 | page = get_page_from_free_area(area, fallback_mt); |
7a8f58f3 | 2766 | |
1c30844d MG |
2767 | steal_suitable_fallback(zone, page, alloc_flags, start_migratetype, |
2768 | can_steal); | |
7a8f58f3 VB |
2769 | |
2770 | trace_mm_page_alloc_extfrag(page, order, current_order, | |
2771 | start_migratetype, fallback_mt); | |
2772 | ||
2773 | return true; | |
2774 | ||
b2a0ac88 MG |
2775 | } |
2776 | ||
56fd56b8 | 2777 | /* |
1da177e4 LT |
2778 | * Do the hard work of removing an element from the buddy allocator. |
2779 | * Call me with the zone->lock already held. | |
2780 | */ | |
85ccc8fa | 2781 | static __always_inline struct page * |
6bb15450 MG |
2782 | __rmqueue(struct zone *zone, unsigned int order, int migratetype, |
2783 | unsigned int alloc_flags) | |
1da177e4 | 2784 | { |
1da177e4 LT |
2785 | struct page *page; |
2786 | ||
16867664 RG |
2787 | #ifdef CONFIG_CMA |
2788 | /* | |
2789 | * Balance movable allocations between regular and CMA areas by | |
2790 | * allocating from CMA when over half of the zone's free memory | |
2791 | * is in the CMA area. | |
2792 | */ | |
2793 | if (migratetype == MIGRATE_MOVABLE && | |
2794 | zone_page_state(zone, NR_FREE_CMA_PAGES) > | |
2795 | zone_page_state(zone, NR_FREE_PAGES) / 2) { | |
2796 | page = __rmqueue_cma_fallback(zone, order); | |
2797 | if (page) | |
2798 | return page; | |
2799 | } | |
2800 | #endif | |
3bc48f96 | 2801 | retry: |
56fd56b8 | 2802 | page = __rmqueue_smallest(zone, order, migratetype); |
974a786e | 2803 | if (unlikely(!page)) { |
dc67647b JK |
2804 | if (migratetype == MIGRATE_MOVABLE) |
2805 | page = __rmqueue_cma_fallback(zone, order); | |
2806 | ||
6bb15450 MG |
2807 | if (!page && __rmqueue_fallback(zone, order, migratetype, |
2808 | alloc_flags)) | |
3bc48f96 | 2809 | goto retry; |
728ec980 MG |
2810 | } |
2811 | ||
0d3d062a | 2812 | trace_mm_page_alloc_zone_locked(page, order, migratetype); |
b2a0ac88 | 2813 | return page; |
1da177e4 LT |
2814 | } |
2815 | ||
5f63b720 | 2816 | /* |
1da177e4 LT |
2817 | * Obtain a specified number of elements from the buddy allocator, all under |
2818 | * a single hold of the lock, for efficiency. Add them to the supplied list. | |
2819 | * Returns the number of new pages which were placed at *list. | |
2820 | */ | |
5f63b720 | 2821 | static int rmqueue_bulk(struct zone *zone, unsigned int order, |
b2a0ac88 | 2822 | unsigned long count, struct list_head *list, |
6bb15450 | 2823 | int migratetype, unsigned int alloc_flags) |
1da177e4 | 2824 | { |
a6de734b | 2825 | int i, alloced = 0; |
5f63b720 | 2826 | |
d34b0733 | 2827 | spin_lock(&zone->lock); |
1da177e4 | 2828 | for (i = 0; i < count; ++i) { |
6bb15450 MG |
2829 | struct page *page = __rmqueue(zone, order, migratetype, |
2830 | alloc_flags); | |
085cc7d5 | 2831 | if (unlikely(page == NULL)) |
1da177e4 | 2832 | break; |
81eabcbe | 2833 | |
479f854a MG |
2834 | if (unlikely(check_pcp_refill(page))) |
2835 | continue; | |
2836 | ||
81eabcbe | 2837 | /* |
0fac3ba5 VB |
2838 | * Split buddy pages returned by expand() are received here in |
2839 | * physical page order. The page is added to the tail of | |
2840 | * caller's list. From the callers perspective, the linked list | |
2841 | * is ordered by page number under some conditions. This is | |
2842 | * useful for IO devices that can forward direction from the | |
2843 | * head, thus also in the physical page order. This is useful | |
2844 | * for IO devices that can merge IO requests if the physical | |
2845 | * pages are ordered properly. | |
81eabcbe | 2846 | */ |
0fac3ba5 | 2847 | list_add_tail(&page->lru, list); |
a6de734b | 2848 | alloced++; |
bb14c2c7 | 2849 | if (is_migrate_cma(get_pcppage_migratetype(page))) |
d1ce749a BZ |
2850 | __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, |
2851 | -(1 << order)); | |
1da177e4 | 2852 | } |
a6de734b MG |
2853 | |
2854 | /* | |
2855 | * i pages were removed from the buddy list even if some leak due | |
2856 | * to check_pcp_refill failing so adjust NR_FREE_PAGES based | |
2857 | * on i. Do not confuse with 'alloced' which is the number of | |
2858 | * pages added to the pcp list. | |
2859 | */ | |
f2260e6b | 2860 | __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order)); |
d34b0733 | 2861 | spin_unlock(&zone->lock); |
a6de734b | 2862 | return alloced; |
1da177e4 LT |
2863 | } |
2864 | ||
4ae7c039 | 2865 | #ifdef CONFIG_NUMA |
8fce4d8e | 2866 | /* |
4037d452 CL |
2867 | * Called from the vmstat counter updater to drain pagesets of this |
2868 | * currently executing processor on remote nodes after they have | |
2869 | * expired. | |
2870 | * | |
879336c3 CL |
2871 | * Note that this function must be called with the thread pinned to |
2872 | * a single processor. | |
8fce4d8e | 2873 | */ |
4037d452 | 2874 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) |
4ae7c039 | 2875 | { |
4ae7c039 | 2876 | unsigned long flags; |
7be12fc9 | 2877 | int to_drain, batch; |
4ae7c039 | 2878 | |
4037d452 | 2879 | local_irq_save(flags); |
4db0c3c2 | 2880 | batch = READ_ONCE(pcp->batch); |
7be12fc9 | 2881 | to_drain = min(pcp->count, batch); |
77ba9062 | 2882 | if (to_drain > 0) |
2a13515c | 2883 | free_pcppages_bulk(zone, to_drain, pcp); |
4037d452 | 2884 | local_irq_restore(flags); |
4ae7c039 CL |
2885 | } |
2886 | #endif | |
2887 | ||
9f8f2172 | 2888 | /* |
93481ff0 | 2889 | * Drain pcplists of the indicated processor and zone. |
9f8f2172 CL |
2890 | * |
2891 | * The processor must either be the current processor and the | |
2892 | * thread pinned to the current processor or a processor that | |
2893 | * is not online. | |
2894 | */ | |
93481ff0 | 2895 | static void drain_pages_zone(unsigned int cpu, struct zone *zone) |
1da177e4 | 2896 | { |
c54ad30c | 2897 | unsigned long flags; |
93481ff0 VB |
2898 | struct per_cpu_pageset *pset; |
2899 | struct per_cpu_pages *pcp; | |
1da177e4 | 2900 | |
93481ff0 VB |
2901 | local_irq_save(flags); |
2902 | pset = per_cpu_ptr(zone->pageset, cpu); | |
1da177e4 | 2903 | |
93481ff0 | 2904 | pcp = &pset->pcp; |
77ba9062 | 2905 | if (pcp->count) |
93481ff0 | 2906 | free_pcppages_bulk(zone, pcp->count, pcp); |
93481ff0 VB |
2907 | local_irq_restore(flags); |
2908 | } | |
3dfa5721 | 2909 | |
93481ff0 VB |
2910 | /* |
2911 | * Drain pcplists of all zones on the indicated processor. | |
2912 | * | |
2913 | * The processor must either be the current processor and the | |
2914 | * thread pinned to the current processor or a processor that | |
2915 | * is not online. | |
2916 | */ | |
2917 | static void drain_pages(unsigned int cpu) | |
2918 | { | |
2919 | struct zone *zone; | |
2920 | ||
2921 | for_each_populated_zone(zone) { | |
2922 | drain_pages_zone(cpu, zone); | |
1da177e4 LT |
2923 | } |
2924 | } | |
1da177e4 | 2925 | |
9f8f2172 CL |
2926 | /* |
2927 | * Spill all of this CPU's per-cpu pages back into the buddy allocator. | |
93481ff0 VB |
2928 | * |
2929 | * The CPU has to be pinned. When zone parameter is non-NULL, spill just | |
2930 | * the single zone's pages. | |
9f8f2172 | 2931 | */ |
93481ff0 | 2932 | void drain_local_pages(struct zone *zone) |
9f8f2172 | 2933 | { |
93481ff0 VB |
2934 | int cpu = smp_processor_id(); |
2935 | ||
2936 | if (zone) | |
2937 | drain_pages_zone(cpu, zone); | |
2938 | else | |
2939 | drain_pages(cpu); | |
9f8f2172 CL |
2940 | } |
2941 | ||
0ccce3b9 MG |
2942 | static void drain_local_pages_wq(struct work_struct *work) |
2943 | { | |
d9367bd0 WY |
2944 | struct pcpu_drain *drain; |
2945 | ||
2946 | drain = container_of(work, struct pcpu_drain, work); | |
2947 | ||
a459eeb7 MH |
2948 | /* |
2949 | * drain_all_pages doesn't use proper cpu hotplug protection so | |
2950 | * we can race with cpu offline when the WQ can move this from | |
2951 | * a cpu pinned worker to an unbound one. We can operate on a different | |
2952 | * cpu which is allright but we also have to make sure to not move to | |
2953 | * a different one. | |
2954 | */ | |
2955 | preempt_disable(); | |
d9367bd0 | 2956 | drain_local_pages(drain->zone); |
a459eeb7 | 2957 | preempt_enable(); |
0ccce3b9 MG |
2958 | } |
2959 | ||
9f8f2172 | 2960 | /* |
74046494 GBY |
2961 | * Spill all the per-cpu pages from all CPUs back into the buddy allocator. |
2962 | * | |
93481ff0 VB |
2963 | * When zone parameter is non-NULL, spill just the single zone's pages. |
2964 | * | |
0ccce3b9 | 2965 | * Note that this can be extremely slow as the draining happens in a workqueue. |
9f8f2172 | 2966 | */ |
93481ff0 | 2967 | void drain_all_pages(struct zone *zone) |
9f8f2172 | 2968 | { |
74046494 | 2969 | int cpu; |
74046494 GBY |
2970 | |
2971 | /* | |
2972 | * Allocate in the BSS so we wont require allocation in | |
2973 | * direct reclaim path for CONFIG_CPUMASK_OFFSTACK=y | |
2974 | */ | |
2975 | static cpumask_t cpus_with_pcps; | |
2976 | ||
ce612879 MH |
2977 | /* |
2978 | * Make sure nobody triggers this path before mm_percpu_wq is fully | |
2979 | * initialized. | |
2980 | */ | |
2981 | if (WARN_ON_ONCE(!mm_percpu_wq)) | |
2982 | return; | |
2983 | ||
bd233f53 MG |
2984 | /* |
2985 | * Do not drain if one is already in progress unless it's specific to | |
2986 | * a zone. Such callers are primarily CMA and memory hotplug and need | |
2987 | * the drain to be complete when the call returns. | |
2988 | */ | |
2989 | if (unlikely(!mutex_trylock(&pcpu_drain_mutex))) { | |
2990 | if (!zone) | |
2991 | return; | |
2992 | mutex_lock(&pcpu_drain_mutex); | |
2993 | } | |
0ccce3b9 | 2994 | |
74046494 GBY |
2995 | /* |
2996 | * We don't care about racing with CPU hotplug event | |
2997 | * as offline notification will cause the notified | |
2998 | * cpu to drain that CPU pcps and on_each_cpu_mask | |
2999 | * disables preemption as part of its processing | |
3000 | */ | |
3001 | for_each_online_cpu(cpu) { | |
93481ff0 VB |
3002 | struct per_cpu_pageset *pcp; |
3003 | struct zone *z; | |
74046494 | 3004 | bool has_pcps = false; |
93481ff0 VB |
3005 | |
3006 | if (zone) { | |
74046494 | 3007 | pcp = per_cpu_ptr(zone->pageset, cpu); |
93481ff0 | 3008 | if (pcp->pcp.count) |
74046494 | 3009 | has_pcps = true; |
93481ff0 VB |
3010 | } else { |
3011 | for_each_populated_zone(z) { | |
3012 | pcp = per_cpu_ptr(z->pageset, cpu); | |
3013 | if (pcp->pcp.count) { | |
3014 | has_pcps = true; | |
3015 | break; | |
3016 | } | |
74046494 GBY |
3017 | } |
3018 | } | |
93481ff0 | 3019 | |
74046494 GBY |
3020 | if (has_pcps) |
3021 | cpumask_set_cpu(cpu, &cpus_with_pcps); | |
3022 | else | |
3023 | cpumask_clear_cpu(cpu, &cpus_with_pcps); | |
3024 | } | |
0ccce3b9 | 3025 | |
bd233f53 | 3026 | for_each_cpu(cpu, &cpus_with_pcps) { |
d9367bd0 WY |
3027 | struct pcpu_drain *drain = per_cpu_ptr(&pcpu_drain, cpu); |
3028 | ||
3029 | drain->zone = zone; | |
3030 | INIT_WORK(&drain->work, drain_local_pages_wq); | |
3031 | queue_work_on(cpu, mm_percpu_wq, &drain->work); | |
0ccce3b9 | 3032 | } |
bd233f53 | 3033 | for_each_cpu(cpu, &cpus_with_pcps) |
d9367bd0 | 3034 | flush_work(&per_cpu_ptr(&pcpu_drain, cpu)->work); |
bd233f53 MG |
3035 | |
3036 | mutex_unlock(&pcpu_drain_mutex); | |
9f8f2172 CL |
3037 | } |
3038 | ||
296699de | 3039 | #ifdef CONFIG_HIBERNATION |
1da177e4 | 3040 | |
556b969a CY |
3041 | /* |
3042 | * Touch the watchdog for every WD_PAGE_COUNT pages. | |
3043 | */ | |
3044 | #define WD_PAGE_COUNT (128*1024) | |
3045 | ||
1da177e4 LT |
3046 | void mark_free_pages(struct zone *zone) |
3047 | { | |
556b969a | 3048 | unsigned long pfn, max_zone_pfn, page_count = WD_PAGE_COUNT; |
f623f0db | 3049 | unsigned long flags; |
7aeb09f9 | 3050 | unsigned int order, t; |
86760a2c | 3051 | struct page *page; |
1da177e4 | 3052 | |
8080fc03 | 3053 | if (zone_is_empty(zone)) |
1da177e4 LT |
3054 | return; |
3055 | ||
3056 | spin_lock_irqsave(&zone->lock, flags); | |
f623f0db | 3057 | |
108bcc96 | 3058 | max_zone_pfn = zone_end_pfn(zone); |
f623f0db RW |
3059 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
3060 | if (pfn_valid(pfn)) { | |
86760a2c | 3061 | page = pfn_to_page(pfn); |
ba6b0979 | 3062 | |
556b969a CY |
3063 | if (!--page_count) { |
3064 | touch_nmi_watchdog(); | |
3065 | page_count = WD_PAGE_COUNT; | |
3066 | } | |
3067 | ||
ba6b0979 JK |
3068 | if (page_zone(page) != zone) |
3069 | continue; | |
3070 | ||
7be98234 RW |
3071 | if (!swsusp_page_is_forbidden(page)) |
3072 | swsusp_unset_page_free(page); | |
f623f0db | 3073 | } |
1da177e4 | 3074 | |
b2a0ac88 | 3075 | for_each_migratetype_order(order, t) { |
86760a2c GT |
3076 | list_for_each_entry(page, |
3077 | &zone->free_area[order].free_list[t], lru) { | |
f623f0db | 3078 | unsigned long i; |
1da177e4 | 3079 | |
86760a2c | 3080 | pfn = page_to_pfn(page); |
556b969a CY |
3081 | for (i = 0; i < (1UL << order); i++) { |
3082 | if (!--page_count) { | |
3083 | touch_nmi_watchdog(); | |
3084 | page_count = WD_PAGE_COUNT; | |
3085 | } | |
7be98234 | 3086 | swsusp_set_page_free(pfn_to_page(pfn + i)); |
556b969a | 3087 | } |
f623f0db | 3088 | } |
b2a0ac88 | 3089 | } |
1da177e4 LT |
3090 | spin_unlock_irqrestore(&zone->lock, flags); |
3091 | } | |
e2c55dc8 | 3092 | #endif /* CONFIG_PM */ |
1da177e4 | 3093 | |
2d4894b5 | 3094 | static bool free_unref_page_prepare(struct page *page, unsigned long pfn) |
1da177e4 | 3095 | { |
5f8dcc21 | 3096 | int migratetype; |
1da177e4 | 3097 | |
4db7548c | 3098 | if (!free_pcp_prepare(page)) |
9cca35d4 | 3099 | return false; |
689bcebf | 3100 | |
dc4b0caf | 3101 | migratetype = get_pfnblock_migratetype(page, pfn); |
bb14c2c7 | 3102 | set_pcppage_migratetype(page, migratetype); |
9cca35d4 MG |
3103 | return true; |
3104 | } | |
3105 | ||
2d4894b5 | 3106 | static void free_unref_page_commit(struct page *page, unsigned long pfn) |
9cca35d4 MG |
3107 | { |
3108 | struct zone *zone = page_zone(page); | |
3109 | struct per_cpu_pages *pcp; | |
3110 | int migratetype; | |
3111 | ||
3112 | migratetype = get_pcppage_migratetype(page); | |
d34b0733 | 3113 | __count_vm_event(PGFREE); |
da456f14 | 3114 | |
5f8dcc21 MG |
3115 | /* |
3116 | * We only track unmovable, reclaimable and movable on pcp lists. | |
3117 | * Free ISOLATE pages back to the allocator because they are being | |
a6ffdc07 | 3118 | * offlined but treat HIGHATOMIC as movable pages so we can get those |
5f8dcc21 MG |
3119 | * areas back if necessary. Otherwise, we may have to free |
3120 | * excessively into the page allocator | |
3121 | */ | |
3122 | if (migratetype >= MIGRATE_PCPTYPES) { | |
194159fb | 3123 | if (unlikely(is_migrate_isolate(migratetype))) { |
dc4b0caf | 3124 | free_one_page(zone, page, pfn, 0, migratetype); |
9cca35d4 | 3125 | return; |
5f8dcc21 MG |
3126 | } |
3127 | migratetype = MIGRATE_MOVABLE; | |
3128 | } | |
3129 | ||
99dcc3e5 | 3130 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
2d4894b5 | 3131 | list_add(&page->lru, &pcp->lists[migratetype]); |
1da177e4 | 3132 | pcp->count++; |
48db57f8 | 3133 | if (pcp->count >= pcp->high) { |
4db0c3c2 | 3134 | unsigned long batch = READ_ONCE(pcp->batch); |
998d39cb | 3135 | free_pcppages_bulk(zone, batch, pcp); |
48db57f8 | 3136 | } |
9cca35d4 | 3137 | } |
5f8dcc21 | 3138 | |
9cca35d4 MG |
3139 | /* |
3140 | * Free a 0-order page | |
9cca35d4 | 3141 | */ |
2d4894b5 | 3142 | void free_unref_page(struct page *page) |
9cca35d4 MG |
3143 | { |
3144 | unsigned long flags; | |
3145 | unsigned long pfn = page_to_pfn(page); | |
3146 | ||
2d4894b5 | 3147 | if (!free_unref_page_prepare(page, pfn)) |
9cca35d4 MG |
3148 | return; |
3149 | ||
3150 | local_irq_save(flags); | |
2d4894b5 | 3151 | free_unref_page_commit(page, pfn); |
d34b0733 | 3152 | local_irq_restore(flags); |
1da177e4 LT |
3153 | } |
3154 | ||
cc59850e KK |
3155 | /* |
3156 | * Free a list of 0-order pages | |
3157 | */ | |
2d4894b5 | 3158 | void free_unref_page_list(struct list_head *list) |
cc59850e KK |
3159 | { |
3160 | struct page *page, *next; | |
9cca35d4 | 3161 | unsigned long flags, pfn; |
c24ad77d | 3162 | int batch_count = 0; |
9cca35d4 MG |
3163 | |
3164 | /* Prepare pages for freeing */ | |
3165 | list_for_each_entry_safe(page, next, list, lru) { | |
3166 | pfn = page_to_pfn(page); | |
2d4894b5 | 3167 | if (!free_unref_page_prepare(page, pfn)) |
9cca35d4 MG |
3168 | list_del(&page->lru); |
3169 | set_page_private(page, pfn); | |
3170 | } | |
cc59850e | 3171 | |
9cca35d4 | 3172 | local_irq_save(flags); |
cc59850e | 3173 | list_for_each_entry_safe(page, next, list, lru) { |
9cca35d4 MG |
3174 | unsigned long pfn = page_private(page); |
3175 | ||
3176 | set_page_private(page, 0); | |
2d4894b5 MG |
3177 | trace_mm_page_free_batched(page); |
3178 | free_unref_page_commit(page, pfn); | |
c24ad77d LS |
3179 | |
3180 | /* | |
3181 | * Guard against excessive IRQ disabled times when we get | |
3182 | * a large list of pages to free. | |
3183 | */ | |
3184 | if (++batch_count == SWAP_CLUSTER_MAX) { | |
3185 | local_irq_restore(flags); | |
3186 | batch_count = 0; | |
3187 | local_irq_save(flags); | |
3188 | } | |
cc59850e | 3189 | } |
9cca35d4 | 3190 | local_irq_restore(flags); |
cc59850e KK |
3191 | } |
3192 | ||
8dfcc9ba NP |
3193 | /* |
3194 | * split_page takes a non-compound higher-order page, and splits it into | |
3195 | * n (1<<order) sub-pages: page[0..n] | |
3196 | * Each sub-page must be freed individually. | |
3197 | * | |
3198 | * Note: this is probably too low level an operation for use in drivers. | |
3199 | * Please consult with lkml before using this in your driver. | |
3200 | */ | |
3201 | void split_page(struct page *page, unsigned int order) | |
3202 | { | |
3203 | int i; | |
3204 | ||
309381fe SL |
3205 | VM_BUG_ON_PAGE(PageCompound(page), page); |
3206 | VM_BUG_ON_PAGE(!page_count(page), page); | |
b1eeab67 | 3207 | |
a9627bc5 | 3208 | for (i = 1; i < (1 << order); i++) |
7835e98b | 3209 | set_page_refcounted(page + i); |
a9627bc5 | 3210 | split_page_owner(page, order); |
8dfcc9ba | 3211 | } |
5853ff23 | 3212 | EXPORT_SYMBOL_GPL(split_page); |
8dfcc9ba | 3213 | |
3c605096 | 3214 | int __isolate_free_page(struct page *page, unsigned int order) |
748446bb | 3215 | { |
748446bb MG |
3216 | unsigned long watermark; |
3217 | struct zone *zone; | |
2139cbe6 | 3218 | int mt; |
748446bb MG |
3219 | |
3220 | BUG_ON(!PageBuddy(page)); | |
3221 | ||
3222 | zone = page_zone(page); | |
2e30abd1 | 3223 | mt = get_pageblock_migratetype(page); |
748446bb | 3224 | |
194159fb | 3225 | if (!is_migrate_isolate(mt)) { |
8348faf9 VB |
3226 | /* |
3227 | * Obey watermarks as if the page was being allocated. We can | |
3228 | * emulate a high-order watermark check with a raised order-0 | |
3229 | * watermark, because we already know our high-order page | |
3230 | * exists. | |
3231 | */ | |
fd1444b2 | 3232 | watermark = zone->_watermark[WMARK_MIN] + (1UL << order); |
d883c6cf | 3233 | if (!zone_watermark_ok(zone, 0, watermark, 0, ALLOC_CMA)) |
2e30abd1 MS |
3234 | return 0; |
3235 | ||
8fb74b9f | 3236 | __mod_zone_freepage_state(zone, -(1UL << order), mt); |
2e30abd1 | 3237 | } |
748446bb MG |
3238 | |
3239 | /* Remove page from free list */ | |
b03641af | 3240 | |
6ab01363 | 3241 | del_page_from_free_list(page, zone, order); |
2139cbe6 | 3242 | |
400bc7fd | 3243 | /* |
3244 | * Set the pageblock if the isolated page is at least half of a | |
3245 | * pageblock | |
3246 | */ | |
748446bb MG |
3247 | if (order >= pageblock_order - 1) { |
3248 | struct page *endpage = page + (1 << order) - 1; | |
47118af0 MN |
3249 | for (; page < endpage; page += pageblock_nr_pages) { |
3250 | int mt = get_pageblock_migratetype(page); | |
88ed365e | 3251 | if (!is_migrate_isolate(mt) && !is_migrate_cma(mt) |
a6ffdc07 | 3252 | && !is_migrate_highatomic(mt)) |
47118af0 MN |
3253 | set_pageblock_migratetype(page, |
3254 | MIGRATE_MOVABLE); | |
3255 | } | |
748446bb MG |
3256 | } |
3257 | ||
f3a14ced | 3258 | |
8fb74b9f | 3259 | return 1UL << order; |
1fb3f8ca MG |
3260 | } |
3261 | ||
624f58d8 AD |
3262 | /** |
3263 | * __putback_isolated_page - Return a now-isolated page back where we got it | |
3264 | * @page: Page that was isolated | |
3265 | * @order: Order of the isolated page | |
e6a0a7ad | 3266 | * @mt: The page's pageblock's migratetype |
624f58d8 AD |
3267 | * |
3268 | * This function is meant to return a page pulled from the free lists via | |
3269 | * __isolate_free_page back to the free lists they were pulled from. | |
3270 | */ | |
3271 | void __putback_isolated_page(struct page *page, unsigned int order, int mt) | |
3272 | { | |
3273 | struct zone *zone = page_zone(page); | |
3274 | ||
3275 | /* zone lock should be held when this function is called */ | |
3276 | lockdep_assert_held(&zone->lock); | |
3277 | ||
3278 | /* Return isolated page to tail of freelist. */ | |
36e66c55 | 3279 | __free_one_page(page, page_to_pfn(page), zone, order, mt, false); |
624f58d8 AD |
3280 | } |
3281 | ||
060e7417 MG |
3282 | /* |
3283 | * Update NUMA hit/miss statistics | |
3284 | * | |
3285 | * Must be called with interrupts disabled. | |
060e7417 | 3286 | */ |
41b6167e | 3287 | static inline void zone_statistics(struct zone *preferred_zone, struct zone *z) |
060e7417 MG |
3288 | { |
3289 | #ifdef CONFIG_NUMA | |
3a321d2a | 3290 | enum numa_stat_item local_stat = NUMA_LOCAL; |
060e7417 | 3291 | |
4518085e KW |
3292 | /* skip numa counters update if numa stats is disabled */ |
3293 | if (!static_branch_likely(&vm_numa_stat_key)) | |
3294 | return; | |
3295 | ||
c1093b74 | 3296 | if (zone_to_nid(z) != numa_node_id()) |
060e7417 | 3297 | local_stat = NUMA_OTHER; |
060e7417 | 3298 | |
c1093b74 | 3299 | if (zone_to_nid(z) == zone_to_nid(preferred_zone)) |
3a321d2a | 3300 | __inc_numa_state(z, NUMA_HIT); |
2df26639 | 3301 | else { |
3a321d2a KW |
3302 | __inc_numa_state(z, NUMA_MISS); |
3303 | __inc_numa_state(preferred_zone, NUMA_FOREIGN); | |
060e7417 | 3304 | } |
3a321d2a | 3305 | __inc_numa_state(z, local_stat); |
060e7417 MG |
3306 | #endif |
3307 | } | |
3308 | ||
066b2393 MG |
3309 | /* Remove page from the per-cpu list, caller must protect the list */ |
3310 | static struct page *__rmqueue_pcplist(struct zone *zone, int migratetype, | |
6bb15450 | 3311 | unsigned int alloc_flags, |
453f85d4 | 3312 | struct per_cpu_pages *pcp, |
066b2393 MG |
3313 | struct list_head *list) |
3314 | { | |
3315 | struct page *page; | |
3316 | ||
3317 | do { | |
3318 | if (list_empty(list)) { | |
3319 | pcp->count += rmqueue_bulk(zone, 0, | |
3320 | pcp->batch, list, | |
6bb15450 | 3321 | migratetype, alloc_flags); |
066b2393 MG |
3322 | if (unlikely(list_empty(list))) |
3323 | return NULL; | |
3324 | } | |
3325 | ||
453f85d4 | 3326 | page = list_first_entry(list, struct page, lru); |
066b2393 MG |
3327 | list_del(&page->lru); |
3328 | pcp->count--; | |
3329 | } while (check_new_pcp(page)); | |
3330 | ||
3331 | return page; | |
3332 | } | |
3333 | ||
3334 | /* Lock and remove page from the per-cpu list */ | |
3335 | static struct page *rmqueue_pcplist(struct zone *preferred_zone, | |
1c52e6d0 YS |
3336 | struct zone *zone, gfp_t gfp_flags, |
3337 | int migratetype, unsigned int alloc_flags) | |
066b2393 MG |
3338 | { |
3339 | struct per_cpu_pages *pcp; | |
3340 | struct list_head *list; | |
066b2393 | 3341 | struct page *page; |
d34b0733 | 3342 | unsigned long flags; |
066b2393 | 3343 | |
d34b0733 | 3344 | local_irq_save(flags); |
066b2393 MG |
3345 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
3346 | list = &pcp->lists[migratetype]; | |
6bb15450 | 3347 | page = __rmqueue_pcplist(zone, migratetype, alloc_flags, pcp, list); |
066b2393 | 3348 | if (page) { |
1c52e6d0 | 3349 | __count_zid_vm_events(PGALLOC, page_zonenum(page), 1); |
066b2393 MG |
3350 | zone_statistics(preferred_zone, zone); |
3351 | } | |
d34b0733 | 3352 | local_irq_restore(flags); |
066b2393 MG |
3353 | return page; |
3354 | } | |
3355 | ||
1da177e4 | 3356 | /* |
75379191 | 3357 | * Allocate a page from the given zone. Use pcplists for order-0 allocations. |
1da177e4 | 3358 | */ |
0a15c3e9 | 3359 | static inline |
066b2393 | 3360 | struct page *rmqueue(struct zone *preferred_zone, |
7aeb09f9 | 3361 | struct zone *zone, unsigned int order, |
c603844b MG |
3362 | gfp_t gfp_flags, unsigned int alloc_flags, |
3363 | int migratetype) | |
1da177e4 LT |
3364 | { |
3365 | unsigned long flags; | |
689bcebf | 3366 | struct page *page; |
1da177e4 | 3367 | |
d34b0733 | 3368 | if (likely(order == 0)) { |
1c52e6d0 YS |
3369 | page = rmqueue_pcplist(preferred_zone, zone, gfp_flags, |
3370 | migratetype, alloc_flags); | |
066b2393 MG |
3371 | goto out; |
3372 | } | |
83b9355b | 3373 | |
066b2393 MG |
3374 | /* |
3375 | * We most definitely don't want callers attempting to | |
3376 | * allocate greater than order-1 page units with __GFP_NOFAIL. | |
3377 | */ | |
3378 | WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1)); | |
3379 | spin_lock_irqsave(&zone->lock, flags); | |
0aaa29a5 | 3380 | |
066b2393 MG |
3381 | do { |
3382 | page = NULL; | |
3383 | if (alloc_flags & ALLOC_HARDER) { | |
3384 | page = __rmqueue_smallest(zone, order, MIGRATE_HIGHATOMIC); | |
3385 | if (page) | |
3386 | trace_mm_page_alloc_zone_locked(page, order, migratetype); | |
3387 | } | |
a74609fa | 3388 | if (!page) |
6bb15450 | 3389 | page = __rmqueue(zone, order, migratetype, alloc_flags); |
066b2393 MG |
3390 | } while (page && check_new_pages(page, order)); |
3391 | spin_unlock(&zone->lock); | |
3392 | if (!page) | |
3393 | goto failed; | |
3394 | __mod_zone_freepage_state(zone, -(1 << order), | |
3395 | get_pcppage_migratetype(page)); | |
1da177e4 | 3396 | |
16709d1d | 3397 | __count_zid_vm_events(PGALLOC, page_zonenum(page), 1 << order); |
41b6167e | 3398 | zone_statistics(preferred_zone, zone); |
a74609fa | 3399 | local_irq_restore(flags); |
1da177e4 | 3400 | |
066b2393 | 3401 | out: |
73444bc4 MG |
3402 | /* Separate test+clear to avoid unnecessary atomics */ |
3403 | if (test_bit(ZONE_BOOSTED_WATERMARK, &zone->flags)) { | |
3404 | clear_bit(ZONE_BOOSTED_WATERMARK, &zone->flags); | |
3405 | wakeup_kswapd(zone, 0, 0, zone_idx(zone)); | |
3406 | } | |
3407 | ||
066b2393 | 3408 | VM_BUG_ON_PAGE(page && bad_range(zone, page), page); |
1da177e4 | 3409 | return page; |
a74609fa NP |
3410 | |
3411 | failed: | |
3412 | local_irq_restore(flags); | |
a74609fa | 3413 | return NULL; |
1da177e4 LT |
3414 | } |
3415 | ||
933e312e AM |
3416 | #ifdef CONFIG_FAIL_PAGE_ALLOC |
3417 | ||
b2588c4b | 3418 | static struct { |
933e312e AM |
3419 | struct fault_attr attr; |
3420 | ||
621a5f7a | 3421 | bool ignore_gfp_highmem; |
71baba4b | 3422 | bool ignore_gfp_reclaim; |
54114994 | 3423 | u32 min_order; |
933e312e AM |
3424 | } fail_page_alloc = { |
3425 | .attr = FAULT_ATTR_INITIALIZER, | |
71baba4b | 3426 | .ignore_gfp_reclaim = true, |
621a5f7a | 3427 | .ignore_gfp_highmem = true, |
54114994 | 3428 | .min_order = 1, |
933e312e AM |
3429 | }; |
3430 | ||
3431 | static int __init setup_fail_page_alloc(char *str) | |
3432 | { | |
3433 | return setup_fault_attr(&fail_page_alloc.attr, str); | |
3434 | } | |
3435 | __setup("fail_page_alloc=", setup_fail_page_alloc); | |
3436 | ||
af3b8544 | 3437 | static bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
933e312e | 3438 | { |
54114994 | 3439 | if (order < fail_page_alloc.min_order) |
deaf386e | 3440 | return false; |
933e312e | 3441 | if (gfp_mask & __GFP_NOFAIL) |
deaf386e | 3442 | return false; |
933e312e | 3443 | if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM)) |
deaf386e | 3444 | return false; |
71baba4b MG |
3445 | if (fail_page_alloc.ignore_gfp_reclaim && |
3446 | (gfp_mask & __GFP_DIRECT_RECLAIM)) | |
deaf386e | 3447 | return false; |
933e312e AM |
3448 | |
3449 | return should_fail(&fail_page_alloc.attr, 1 << order); | |
3450 | } | |
3451 | ||
3452 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
3453 | ||
3454 | static int __init fail_page_alloc_debugfs(void) | |
3455 | { | |
0825a6f9 | 3456 | umode_t mode = S_IFREG | 0600; |
933e312e | 3457 | struct dentry *dir; |
933e312e | 3458 | |
dd48c085 AM |
3459 | dir = fault_create_debugfs_attr("fail_page_alloc", NULL, |
3460 | &fail_page_alloc.attr); | |
b2588c4b | 3461 | |
d9f7979c GKH |
3462 | debugfs_create_bool("ignore-gfp-wait", mode, dir, |
3463 | &fail_page_alloc.ignore_gfp_reclaim); | |
3464 | debugfs_create_bool("ignore-gfp-highmem", mode, dir, | |
3465 | &fail_page_alloc.ignore_gfp_highmem); | |
3466 | debugfs_create_u32("min-order", mode, dir, &fail_page_alloc.min_order); | |
933e312e | 3467 | |
d9f7979c | 3468 | return 0; |
933e312e AM |
3469 | } |
3470 | ||
3471 | late_initcall(fail_page_alloc_debugfs); | |
3472 | ||
3473 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
3474 | ||
3475 | #else /* CONFIG_FAIL_PAGE_ALLOC */ | |
3476 | ||
af3b8544 | 3477 | static inline bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
933e312e | 3478 | { |
deaf386e | 3479 | return false; |
933e312e AM |
3480 | } |
3481 | ||
3482 | #endif /* CONFIG_FAIL_PAGE_ALLOC */ | |
3483 | ||
af3b8544 BP |
3484 | static noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) |
3485 | { | |
3486 | return __should_fail_alloc_page(gfp_mask, order); | |
3487 | } | |
3488 | ALLOW_ERROR_INJECTION(should_fail_alloc_page, TRUE); | |
3489 | ||
1da177e4 | 3490 | /* |
97a16fc8 MG |
3491 | * Return true if free base pages are above 'mark'. For high-order checks it |
3492 | * will return true of the order-0 watermark is reached and there is at least | |
3493 | * one free page of a suitable size. Checking now avoids taking the zone lock | |
3494 | * to check in the allocation paths if no pages are free. | |
1da177e4 | 3495 | */ |
86a294a8 | 3496 | bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
97a225e6 | 3497 | int highest_zoneidx, unsigned int alloc_flags, |
86a294a8 | 3498 | long free_pages) |
1da177e4 | 3499 | { |
d23ad423 | 3500 | long min = mark; |
1da177e4 | 3501 | int o; |
cd04ae1e | 3502 | const bool alloc_harder = (alloc_flags & (ALLOC_HARDER|ALLOC_OOM)); |
1da177e4 | 3503 | |
0aaa29a5 | 3504 | /* free_pages may go negative - that's OK */ |
df0a6daa | 3505 | free_pages -= (1 << order) - 1; |
0aaa29a5 | 3506 | |
7fb1d9fc | 3507 | if (alloc_flags & ALLOC_HIGH) |
1da177e4 | 3508 | min -= min / 2; |
0aaa29a5 MG |
3509 | |
3510 | /* | |
3511 | * If the caller does not have rights to ALLOC_HARDER then subtract | |
3512 | * the high-atomic reserves. This will over-estimate the size of the | |
3513 | * atomic reserve but it avoids a search. | |
3514 | */ | |
cd04ae1e | 3515 | if (likely(!alloc_harder)) { |
0aaa29a5 | 3516 | free_pages -= z->nr_reserved_highatomic; |
cd04ae1e MH |
3517 | } else { |
3518 | /* | |
3519 | * OOM victims can try even harder than normal ALLOC_HARDER | |
3520 | * users on the grounds that it's definitely going to be in | |
3521 | * the exit path shortly and free memory. Any allocation it | |
3522 | * makes during the free path will be small and short-lived. | |
3523 | */ | |
3524 | if (alloc_flags & ALLOC_OOM) | |
3525 | min -= min / 2; | |
3526 | else | |
3527 | min -= min / 4; | |
3528 | } | |
3529 | ||
e2b19197 | 3530 | |
d883c6cf JK |
3531 | #ifdef CONFIG_CMA |
3532 | /* If allocation can't use CMA areas don't use free CMA pages */ | |
3533 | if (!(alloc_flags & ALLOC_CMA)) | |
3534 | free_pages -= zone_page_state(z, NR_FREE_CMA_PAGES); | |
3535 | #endif | |
3536 | ||
97a16fc8 MG |
3537 | /* |
3538 | * Check watermarks for an order-0 allocation request. If these | |
3539 | * are not met, then a high-order request also cannot go ahead | |
3540 | * even if a suitable page happened to be free. | |
3541 | */ | |
97a225e6 | 3542 | if (free_pages <= min + z->lowmem_reserve[highest_zoneidx]) |
88f5acf8 | 3543 | return false; |
1da177e4 | 3544 | |
97a16fc8 MG |
3545 | /* If this is an order-0 request then the watermark is fine */ |
3546 | if (!order) | |
3547 | return true; | |
3548 | ||
3549 | /* For a high-order request, check at least one suitable page is free */ | |
3550 | for (o = order; o < MAX_ORDER; o++) { | |
3551 | struct free_area *area = &z->free_area[o]; | |
3552 | int mt; | |
3553 | ||
3554 | if (!area->nr_free) | |
3555 | continue; | |
3556 | ||
97a16fc8 | 3557 | for (mt = 0; mt < MIGRATE_PCPTYPES; mt++) { |
b03641af | 3558 | if (!free_area_empty(area, mt)) |
97a16fc8 MG |
3559 | return true; |
3560 | } | |
3561 | ||
3562 | #ifdef CONFIG_CMA | |
d883c6cf | 3563 | if ((alloc_flags & ALLOC_CMA) && |
b03641af | 3564 | !free_area_empty(area, MIGRATE_CMA)) { |
97a16fc8 | 3565 | return true; |
d883c6cf | 3566 | } |
97a16fc8 | 3567 | #endif |
76089d00 | 3568 | if (alloc_harder && !free_area_empty(area, MIGRATE_HIGHATOMIC)) |
b050e376 | 3569 | return true; |
1da177e4 | 3570 | } |
97a16fc8 | 3571 | return false; |
88f5acf8 MG |
3572 | } |
3573 | ||
7aeb09f9 | 3574 | bool zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
97a225e6 | 3575 | int highest_zoneidx, unsigned int alloc_flags) |
88f5acf8 | 3576 | { |
97a225e6 | 3577 | return __zone_watermark_ok(z, order, mark, highest_zoneidx, alloc_flags, |
88f5acf8 MG |
3578 | zone_page_state(z, NR_FREE_PAGES)); |
3579 | } | |
3580 | ||
48ee5f36 | 3581 | static inline bool zone_watermark_fast(struct zone *z, unsigned int order, |
97a225e6 JK |
3582 | unsigned long mark, int highest_zoneidx, |
3583 | unsigned int alloc_flags) | |
48ee5f36 MG |
3584 | { |
3585 | long free_pages = zone_page_state(z, NR_FREE_PAGES); | |
d883c6cf JK |
3586 | long cma_pages = 0; |
3587 | ||
3588 | #ifdef CONFIG_CMA | |
3589 | /* If allocation can't use CMA areas don't use free CMA pages */ | |
3590 | if (!(alloc_flags & ALLOC_CMA)) | |
3591 | cma_pages = zone_page_state(z, NR_FREE_CMA_PAGES); | |
3592 | #endif | |
48ee5f36 MG |
3593 | |
3594 | /* | |
3595 | * Fast check for order-0 only. If this fails then the reserves | |
3596 | * need to be calculated. There is a corner case where the check | |
3597 | * passes but only the high-order atomic reserve are free. If | |
3598 | * the caller is !atomic then it'll uselessly search the free | |
3599 | * list. That corner case is then slower but it is harmless. | |
3600 | */ | |
97a225e6 JK |
3601 | if (!order && (free_pages - cma_pages) > |
3602 | mark + z->lowmem_reserve[highest_zoneidx]) | |
48ee5f36 MG |
3603 | return true; |
3604 | ||
97a225e6 | 3605 | return __zone_watermark_ok(z, order, mark, highest_zoneidx, alloc_flags, |
48ee5f36 MG |
3606 | free_pages); |
3607 | } | |
3608 | ||
7aeb09f9 | 3609 | bool zone_watermark_ok_safe(struct zone *z, unsigned int order, |
97a225e6 | 3610 | unsigned long mark, int highest_zoneidx) |
88f5acf8 MG |
3611 | { |
3612 | long free_pages = zone_page_state(z, NR_FREE_PAGES); | |
3613 | ||
3614 | if (z->percpu_drift_mark && free_pages < z->percpu_drift_mark) | |
3615 | free_pages = zone_page_state_snapshot(z, NR_FREE_PAGES); | |
3616 | ||
97a225e6 | 3617 | return __zone_watermark_ok(z, order, mark, highest_zoneidx, 0, |
88f5acf8 | 3618 | free_pages); |
1da177e4 LT |
3619 | } |
3620 | ||
9276b1bc | 3621 | #ifdef CONFIG_NUMA |
957f822a DR |
3622 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
3623 | { | |
e02dc017 | 3624 | return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) <= |
a55c7454 | 3625 | node_reclaim_distance; |
957f822a | 3626 | } |
9276b1bc | 3627 | #else /* CONFIG_NUMA */ |
957f822a DR |
3628 | static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone) |
3629 | { | |
3630 | return true; | |
3631 | } | |
9276b1bc PJ |
3632 | #endif /* CONFIG_NUMA */ |
3633 | ||
6bb15450 MG |
3634 | /* |
3635 | * The restriction on ZONE_DMA32 as being a suitable zone to use to avoid | |
3636 | * fragmentation is subtle. If the preferred zone was HIGHMEM then | |
3637 | * premature use of a lower zone may cause lowmem pressure problems that | |
3638 | * are worse than fragmentation. If the next zone is ZONE_DMA then it is | |
3639 | * probably too small. It only makes sense to spread allocations to avoid | |
3640 | * fragmentation between the Normal and DMA32 zones. | |
3641 | */ | |
3642 | static inline unsigned int | |
0a79cdad | 3643 | alloc_flags_nofragment(struct zone *zone, gfp_t gfp_mask) |
6bb15450 | 3644 | { |
736838e9 | 3645 | unsigned int alloc_flags; |
0a79cdad | 3646 | |
736838e9 MN |
3647 | /* |
3648 | * __GFP_KSWAPD_RECLAIM is assumed to be the same as ALLOC_KSWAPD | |
3649 | * to save a branch. | |
3650 | */ | |
3651 | alloc_flags = (__force int) (gfp_mask & __GFP_KSWAPD_RECLAIM); | |
0a79cdad MG |
3652 | |
3653 | #ifdef CONFIG_ZONE_DMA32 | |
8139ad04 AR |
3654 | if (!zone) |
3655 | return alloc_flags; | |
3656 | ||
6bb15450 | 3657 | if (zone_idx(zone) != ZONE_NORMAL) |
8118b82e | 3658 | return alloc_flags; |
6bb15450 MG |
3659 | |
3660 | /* | |
3661 | * If ZONE_DMA32 exists, assume it is the one after ZONE_NORMAL and | |
3662 | * the pointer is within zone->zone_pgdat->node_zones[]. Also assume | |
3663 | * on UMA that if Normal is populated then so is DMA32. | |
3664 | */ | |
3665 | BUILD_BUG_ON(ZONE_NORMAL - ZONE_DMA32 != 1); | |
3666 | if (nr_online_nodes > 1 && !populated_zone(--zone)) | |
8118b82e | 3667 | return alloc_flags; |
6bb15450 | 3668 | |
8118b82e | 3669 | alloc_flags |= ALLOC_NOFRAGMENT; |
0a79cdad MG |
3670 | #endif /* CONFIG_ZONE_DMA32 */ |
3671 | return alloc_flags; | |
6bb15450 | 3672 | } |
6bb15450 | 3673 | |
7fb1d9fc | 3674 | /* |
0798e519 | 3675 | * get_page_from_freelist goes through the zonelist trying to allocate |
7fb1d9fc RS |
3676 | * a page. |
3677 | */ | |
3678 | static struct page * | |
a9263751 VB |
3679 | get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, |
3680 | const struct alloc_context *ac) | |
753ee728 | 3681 | { |
6bb15450 | 3682 | struct zoneref *z; |
5117f45d | 3683 | struct zone *zone; |
3b8c0be4 | 3684 | struct pglist_data *last_pgdat_dirty_limit = NULL; |
6bb15450 | 3685 | bool no_fallback; |
3b8c0be4 | 3686 | |
6bb15450 | 3687 | retry: |
7fb1d9fc | 3688 | /* |
9276b1bc | 3689 | * Scan zonelist, looking for a zone with enough free. |
344736f2 | 3690 | * See also __cpuset_node_allowed() comment in kernel/cpuset.c. |
7fb1d9fc | 3691 | */ |
6bb15450 MG |
3692 | no_fallback = alloc_flags & ALLOC_NOFRAGMENT; |
3693 | z = ac->preferred_zoneref; | |
97a225e6 JK |
3694 | for_next_zone_zonelist_nodemask(zone, z, ac->zonelist, |
3695 | ac->highest_zoneidx, ac->nodemask) { | |
be06af00 | 3696 | struct page *page; |
e085dbc5 JW |
3697 | unsigned long mark; |
3698 | ||
664eedde MG |
3699 | if (cpusets_enabled() && |
3700 | (alloc_flags & ALLOC_CPUSET) && | |
002f2906 | 3701 | !__cpuset_zone_allowed(zone, gfp_mask)) |
cd38b115 | 3702 | continue; |
a756cf59 JW |
3703 | /* |
3704 | * When allocating a page cache page for writing, we | |
281e3726 MG |
3705 | * want to get it from a node that is within its dirty |
3706 | * limit, such that no single node holds more than its | |
a756cf59 | 3707 | * proportional share of globally allowed dirty pages. |
281e3726 | 3708 | * The dirty limits take into account the node's |
a756cf59 JW |
3709 | * lowmem reserves and high watermark so that kswapd |
3710 | * should be able to balance it without having to | |
3711 | * write pages from its LRU list. | |
3712 | * | |
a756cf59 | 3713 | * XXX: For now, allow allocations to potentially |
281e3726 | 3714 | * exceed the per-node dirty limit in the slowpath |
c9ab0c4f | 3715 | * (spread_dirty_pages unset) before going into reclaim, |
a756cf59 | 3716 | * which is important when on a NUMA setup the allowed |
281e3726 | 3717 | * nodes are together not big enough to reach the |
a756cf59 | 3718 | * global limit. The proper fix for these situations |
281e3726 | 3719 | * will require awareness of nodes in the |
a756cf59 JW |
3720 | * dirty-throttling and the flusher threads. |
3721 | */ | |
3b8c0be4 MG |
3722 | if (ac->spread_dirty_pages) { |
3723 | if (last_pgdat_dirty_limit == zone->zone_pgdat) | |
3724 | continue; | |
3725 | ||
3726 | if (!node_dirty_ok(zone->zone_pgdat)) { | |
3727 | last_pgdat_dirty_limit = zone->zone_pgdat; | |
3728 | continue; | |
3729 | } | |
3730 | } | |
7fb1d9fc | 3731 | |
6bb15450 MG |
3732 | if (no_fallback && nr_online_nodes > 1 && |
3733 | zone != ac->preferred_zoneref->zone) { | |
3734 | int local_nid; | |
3735 | ||
3736 | /* | |
3737 | * If moving to a remote node, retry but allow | |
3738 | * fragmenting fallbacks. Locality is more important | |
3739 | * than fragmentation avoidance. | |
3740 | */ | |
3741 | local_nid = zone_to_nid(ac->preferred_zoneref->zone); | |
3742 | if (zone_to_nid(zone) != local_nid) { | |
3743 | alloc_flags &= ~ALLOC_NOFRAGMENT; | |
3744 | goto retry; | |
3745 | } | |
3746 | } | |
3747 | ||
a9214443 | 3748 | mark = wmark_pages(zone, alloc_flags & ALLOC_WMARK_MASK); |
48ee5f36 | 3749 | if (!zone_watermark_fast(zone, order, mark, |
97a225e6 | 3750 | ac->highest_zoneidx, alloc_flags)) { |
fa5e084e MG |
3751 | int ret; |
3752 | ||
c9e97a19 PT |
3753 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
3754 | /* | |
3755 | * Watermark failed for this zone, but see if we can | |
3756 | * grow this zone if it contains deferred pages. | |
3757 | */ | |
3758 | if (static_branch_unlikely(&deferred_pages)) { | |
3759 | if (_deferred_grow_zone(zone, order)) | |
3760 | goto try_this_zone; | |
3761 | } | |
3762 | #endif | |
5dab2911 MG |
3763 | /* Checked here to keep the fast path fast */ |
3764 | BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK); | |
3765 | if (alloc_flags & ALLOC_NO_WATERMARKS) | |
3766 | goto try_this_zone; | |
3767 | ||
a5f5f91d | 3768 | if (node_reclaim_mode == 0 || |
c33d6c06 | 3769 | !zone_allows_reclaim(ac->preferred_zoneref->zone, zone)) |
cd38b115 MG |
3770 | continue; |
3771 | ||
a5f5f91d | 3772 | ret = node_reclaim(zone->zone_pgdat, gfp_mask, order); |
fa5e084e | 3773 | switch (ret) { |
a5f5f91d | 3774 | case NODE_RECLAIM_NOSCAN: |
fa5e084e | 3775 | /* did not scan */ |
cd38b115 | 3776 | continue; |
a5f5f91d | 3777 | case NODE_RECLAIM_FULL: |
fa5e084e | 3778 | /* scanned but unreclaimable */ |
cd38b115 | 3779 | continue; |
fa5e084e MG |
3780 | default: |
3781 | /* did we reclaim enough */ | |
fed2719e | 3782 | if (zone_watermark_ok(zone, order, mark, |
97a225e6 | 3783 | ac->highest_zoneidx, alloc_flags)) |
fed2719e MG |
3784 | goto try_this_zone; |
3785 | ||
fed2719e | 3786 | continue; |
0798e519 | 3787 | } |
7fb1d9fc RS |
3788 | } |
3789 | ||
fa5e084e | 3790 | try_this_zone: |
066b2393 | 3791 | page = rmqueue(ac->preferred_zoneref->zone, zone, order, |
0aaa29a5 | 3792 | gfp_mask, alloc_flags, ac->migratetype); |
75379191 | 3793 | if (page) { |
479f854a | 3794 | prep_new_page(page, order, gfp_mask, alloc_flags); |
0aaa29a5 MG |
3795 | |
3796 | /* | |
3797 | * If this is a high-order atomic allocation then check | |
3798 | * if the pageblock should be reserved for the future | |
3799 | */ | |
3800 | if (unlikely(order && (alloc_flags & ALLOC_HARDER))) | |
3801 | reserve_highatomic_pageblock(page, zone, order); | |
3802 | ||
75379191 | 3803 | return page; |
c9e97a19 PT |
3804 | } else { |
3805 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT | |
3806 | /* Try again if zone has deferred pages */ | |
3807 | if (static_branch_unlikely(&deferred_pages)) { | |
3808 | if (_deferred_grow_zone(zone, order)) | |
3809 | goto try_this_zone; | |
3810 | } | |
3811 | #endif | |
75379191 | 3812 | } |
54a6eb5c | 3813 | } |
9276b1bc | 3814 | |
6bb15450 MG |
3815 | /* |
3816 | * It's possible on a UMA machine to get through all zones that are | |
3817 | * fragmented. If avoiding fragmentation, reset and try again. | |
3818 | */ | |
3819 | if (no_fallback) { | |
3820 | alloc_flags &= ~ALLOC_NOFRAGMENT; | |
3821 | goto retry; | |
3822 | } | |
3823 | ||
4ffeaf35 | 3824 | return NULL; |
753ee728 MH |
3825 | } |
3826 | ||
9af744d7 | 3827 | static void warn_alloc_show_mem(gfp_t gfp_mask, nodemask_t *nodemask) |
a238ab5b | 3828 | { |
a238ab5b | 3829 | unsigned int filter = SHOW_MEM_FILTER_NODES; |
a238ab5b DH |
3830 | |
3831 | /* | |
3832 | * This documents exceptions given to allocations in certain | |
3833 | * contexts that are allowed to allocate outside current's set | |
3834 | * of allowed nodes. | |
3835 | */ | |
3836 | if (!(gfp_mask & __GFP_NOMEMALLOC)) | |
cd04ae1e | 3837 | if (tsk_is_oom_victim(current) || |
a238ab5b DH |
3838 | (current->flags & (PF_MEMALLOC | PF_EXITING))) |
3839 | filter &= ~SHOW_MEM_FILTER_NODES; | |
d0164adc | 3840 | if (in_interrupt() || !(gfp_mask & __GFP_DIRECT_RECLAIM)) |
a238ab5b DH |
3841 | filter &= ~SHOW_MEM_FILTER_NODES; |
3842 | ||
9af744d7 | 3843 | show_mem(filter, nodemask); |
aa187507 MH |
3844 | } |
3845 | ||
a8e99259 | 3846 | void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...) |
aa187507 MH |
3847 | { |
3848 | struct va_format vaf; | |
3849 | va_list args; | |
1be334e5 | 3850 | static DEFINE_RATELIMIT_STATE(nopage_rs, 10*HZ, 1); |
aa187507 | 3851 | |
0f7896f1 | 3852 | if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs)) |
aa187507 MH |
3853 | return; |
3854 | ||
7877cdcc MH |
3855 | va_start(args, fmt); |
3856 | vaf.fmt = fmt; | |
3857 | vaf.va = &args; | |
ef8444ea | 3858 | pr_warn("%s: %pV, mode:%#x(%pGg), nodemask=%*pbl", |
0205f755 MH |
3859 | current->comm, &vaf, gfp_mask, &gfp_mask, |
3860 | nodemask_pr_args(nodemask)); | |
7877cdcc | 3861 | va_end(args); |
3ee9a4f0 | 3862 | |
a8e99259 | 3863 | cpuset_print_current_mems_allowed(); |
ef8444ea | 3864 | pr_cont("\n"); |
a238ab5b | 3865 | dump_stack(); |
685dbf6f | 3866 | warn_alloc_show_mem(gfp_mask, nodemask); |
a238ab5b DH |
3867 | } |
3868 | ||
6c18ba7a MH |
3869 | static inline struct page * |
3870 | __alloc_pages_cpuset_fallback(gfp_t gfp_mask, unsigned int order, | |
3871 | unsigned int alloc_flags, | |
3872 | const struct alloc_context *ac) | |
3873 | { | |
3874 | struct page *page; | |
3875 | ||
3876 | page = get_page_from_freelist(gfp_mask, order, | |
3877 | alloc_flags|ALLOC_CPUSET, ac); | |
3878 | /* | |
3879 | * fallback to ignore cpuset restriction if our nodes | |
3880 | * are depleted | |
3881 | */ | |
3882 | if (!page) | |
3883 | page = get_page_from_freelist(gfp_mask, order, | |
3884 | alloc_flags, ac); | |
3885 | ||
3886 | return page; | |
3887 | } | |
3888 | ||
11e33f6a MG |
3889 | static inline struct page * |
3890 | __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 3891 | const struct alloc_context *ac, unsigned long *did_some_progress) |
11e33f6a | 3892 | { |
6e0fc46d DR |
3893 | struct oom_control oc = { |
3894 | .zonelist = ac->zonelist, | |
3895 | .nodemask = ac->nodemask, | |
2a966b77 | 3896 | .memcg = NULL, |
6e0fc46d DR |
3897 | .gfp_mask = gfp_mask, |
3898 | .order = order, | |
6e0fc46d | 3899 | }; |
11e33f6a MG |
3900 | struct page *page; |
3901 | ||
9879de73 JW |
3902 | *did_some_progress = 0; |
3903 | ||
9879de73 | 3904 | /* |
dc56401f JW |
3905 | * Acquire the oom lock. If that fails, somebody else is |
3906 | * making progress for us. | |
9879de73 | 3907 | */ |
dc56401f | 3908 | if (!mutex_trylock(&oom_lock)) { |
9879de73 | 3909 | *did_some_progress = 1; |
11e33f6a | 3910 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
3911 | return NULL; |
3912 | } | |
6b1de916 | 3913 | |
11e33f6a MG |
3914 | /* |
3915 | * Go through the zonelist yet one more time, keep very high watermark | |
3916 | * here, this is only to catch a parallel oom killing, we must fail if | |
e746bf73 TH |
3917 | * we're still under heavy pressure. But make sure that this reclaim |
3918 | * attempt shall not depend on __GFP_DIRECT_RECLAIM && !__GFP_NORETRY | |
3919 | * allocation which will never fail due to oom_lock already held. | |
11e33f6a | 3920 | */ |
e746bf73 TH |
3921 | page = get_page_from_freelist((gfp_mask | __GFP_HARDWALL) & |
3922 | ~__GFP_DIRECT_RECLAIM, order, | |
3923 | ALLOC_WMARK_HIGH|ALLOC_CPUSET, ac); | |
7fb1d9fc | 3924 | if (page) |
11e33f6a MG |
3925 | goto out; |
3926 | ||
06ad276a MH |
3927 | /* Coredumps can quickly deplete all memory reserves */ |
3928 | if (current->flags & PF_DUMPCORE) | |
3929 | goto out; | |
3930 | /* The OOM killer will not help higher order allocs */ | |
3931 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
3932 | goto out; | |
dcda9b04 MH |
3933 | /* |
3934 | * We have already exhausted all our reclaim opportunities without any | |
3935 | * success so it is time to admit defeat. We will skip the OOM killer | |
3936 | * because it is very likely that the caller has a more reasonable | |
3937 | * fallback than shooting a random task. | |
3938 | */ | |
3939 | if (gfp_mask & __GFP_RETRY_MAYFAIL) | |
3940 | goto out; | |
06ad276a | 3941 | /* The OOM killer does not needlessly kill tasks for lowmem */ |
97a225e6 | 3942 | if (ac->highest_zoneidx < ZONE_NORMAL) |
06ad276a MH |
3943 | goto out; |
3944 | if (pm_suspended_storage()) | |
3945 | goto out; | |
3946 | /* | |
3947 | * XXX: GFP_NOFS allocations should rather fail than rely on | |
3948 | * other request to make a forward progress. | |
3949 | * We are in an unfortunate situation where out_of_memory cannot | |
3950 | * do much for this context but let's try it to at least get | |
3951 | * access to memory reserved if the current task is killed (see | |
3952 | * out_of_memory). Once filesystems are ready to handle allocation | |
3953 | * failures more gracefully we should just bail out here. | |
3954 | */ | |
3955 | ||
3956 | /* The OOM killer may not free memory on a specific node */ | |
3957 | if (gfp_mask & __GFP_THISNODE) | |
3958 | goto out; | |
3da88fb3 | 3959 | |
3c2c6488 | 3960 | /* Exhausted what can be done so it's blame time */ |
5020e285 | 3961 | if (out_of_memory(&oc) || WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL)) { |
c32b3cbe | 3962 | *did_some_progress = 1; |
5020e285 | 3963 | |
6c18ba7a MH |
3964 | /* |
3965 | * Help non-failing allocations by giving them access to memory | |
3966 | * reserves | |
3967 | */ | |
3968 | if (gfp_mask & __GFP_NOFAIL) | |
3969 | page = __alloc_pages_cpuset_fallback(gfp_mask, order, | |
5020e285 | 3970 | ALLOC_NO_WATERMARKS, ac); |
5020e285 | 3971 | } |
11e33f6a | 3972 | out: |
dc56401f | 3973 | mutex_unlock(&oom_lock); |
11e33f6a MG |
3974 | return page; |
3975 | } | |
3976 | ||
33c2d214 MH |
3977 | /* |
3978 | * Maximum number of compaction retries wit a progress before OOM | |
3979 | * killer is consider as the only way to move forward. | |
3980 | */ | |
3981 | #define MAX_COMPACT_RETRIES 16 | |
3982 | ||
56de7263 MG |
3983 | #ifdef CONFIG_COMPACTION |
3984 | /* Try memory compaction for high-order allocations before reclaim */ | |
3985 | static struct page * | |
3986 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
c603844b | 3987 | unsigned int alloc_flags, const struct alloc_context *ac, |
a5508cd8 | 3988 | enum compact_priority prio, enum compact_result *compact_result) |
56de7263 | 3989 | { |
5e1f0f09 | 3990 | struct page *page = NULL; |
eb414681 | 3991 | unsigned long pflags; |
499118e9 | 3992 | unsigned int noreclaim_flag; |
53853e2d VB |
3993 | |
3994 | if (!order) | |
66199712 | 3995 | return NULL; |
66199712 | 3996 | |
eb414681 | 3997 | psi_memstall_enter(&pflags); |
499118e9 | 3998 | noreclaim_flag = memalloc_noreclaim_save(); |
eb414681 | 3999 | |
c5d01d0d | 4000 | *compact_result = try_to_compact_pages(gfp_mask, order, alloc_flags, ac, |
5e1f0f09 | 4001 | prio, &page); |
eb414681 | 4002 | |
499118e9 | 4003 | memalloc_noreclaim_restore(noreclaim_flag); |
eb414681 | 4004 | psi_memstall_leave(&pflags); |
56de7263 | 4005 | |
98dd3b48 VB |
4006 | /* |
4007 | * At least in one zone compaction wasn't deferred or skipped, so let's | |
4008 | * count a compaction stall | |
4009 | */ | |
4010 | count_vm_event(COMPACTSTALL); | |
8fb74b9f | 4011 | |
5e1f0f09 MG |
4012 | /* Prep a captured page if available */ |
4013 | if (page) | |
4014 | prep_new_page(page, order, gfp_mask, alloc_flags); | |
4015 | ||
4016 | /* Try get a page from the freelist if available */ | |
4017 | if (!page) | |
4018 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); | |
53853e2d | 4019 | |
98dd3b48 VB |
4020 | if (page) { |
4021 | struct zone *zone = page_zone(page); | |
53853e2d | 4022 | |
98dd3b48 VB |
4023 | zone->compact_blockskip_flush = false; |
4024 | compaction_defer_reset(zone, order, true); | |
4025 | count_vm_event(COMPACTSUCCESS); | |
4026 | return page; | |
4027 | } | |
56de7263 | 4028 | |
98dd3b48 VB |
4029 | /* |
4030 | * It's bad if compaction run occurs and fails. The most likely reason | |
4031 | * is that pages exist, but not enough to satisfy watermarks. | |
4032 | */ | |
4033 | count_vm_event(COMPACTFAIL); | |
66199712 | 4034 | |
98dd3b48 | 4035 | cond_resched(); |
56de7263 MG |
4036 | |
4037 | return NULL; | |
4038 | } | |
33c2d214 | 4039 | |
3250845d VB |
4040 | static inline bool |
4041 | should_compact_retry(struct alloc_context *ac, int order, int alloc_flags, | |
4042 | enum compact_result compact_result, | |
4043 | enum compact_priority *compact_priority, | |
d9436498 | 4044 | int *compaction_retries) |
3250845d VB |
4045 | { |
4046 | int max_retries = MAX_COMPACT_RETRIES; | |
c2033b00 | 4047 | int min_priority; |
65190cff MH |
4048 | bool ret = false; |
4049 | int retries = *compaction_retries; | |
4050 | enum compact_priority priority = *compact_priority; | |
3250845d VB |
4051 | |
4052 | if (!order) | |
4053 | return false; | |
4054 | ||
d9436498 VB |
4055 | if (compaction_made_progress(compact_result)) |
4056 | (*compaction_retries)++; | |
4057 | ||
3250845d VB |
4058 | /* |
4059 | * compaction considers all the zone as desperately out of memory | |
4060 | * so it doesn't really make much sense to retry except when the | |
4061 | * failure could be caused by insufficient priority | |
4062 | */ | |
d9436498 VB |
4063 | if (compaction_failed(compact_result)) |
4064 | goto check_priority; | |
3250845d | 4065 | |
49433085 VB |
4066 | /* |
4067 | * compaction was skipped because there are not enough order-0 pages | |
4068 | * to work with, so we retry only if it looks like reclaim can help. | |
4069 | */ | |
4070 | if (compaction_needs_reclaim(compact_result)) { | |
4071 | ret = compaction_zonelist_suitable(ac, order, alloc_flags); | |
4072 | goto out; | |
4073 | } | |
4074 | ||
3250845d VB |
4075 | /* |
4076 | * make sure the compaction wasn't deferred or didn't bail out early | |
4077 | * due to locks contention before we declare that we should give up. | |
49433085 VB |
4078 | * But the next retry should use a higher priority if allowed, so |
4079 | * we don't just keep bailing out endlessly. | |
3250845d | 4080 | */ |
65190cff | 4081 | if (compaction_withdrawn(compact_result)) { |
49433085 | 4082 | goto check_priority; |
65190cff | 4083 | } |
3250845d VB |
4084 | |
4085 | /* | |
dcda9b04 | 4086 | * !costly requests are much more important than __GFP_RETRY_MAYFAIL |
3250845d VB |
4087 | * costly ones because they are de facto nofail and invoke OOM |
4088 | * killer to move on while costly can fail and users are ready | |
4089 | * to cope with that. 1/4 retries is rather arbitrary but we | |
4090 | * would need much more detailed feedback from compaction to | |
4091 | * make a better decision. | |
4092 | */ | |
4093 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
4094 | max_retries /= 4; | |
65190cff MH |
4095 | if (*compaction_retries <= max_retries) { |
4096 | ret = true; | |
4097 | goto out; | |
4098 | } | |
3250845d | 4099 | |
d9436498 VB |
4100 | /* |
4101 | * Make sure there are attempts at the highest priority if we exhausted | |
4102 | * all retries or failed at the lower priorities. | |
4103 | */ | |
4104 | check_priority: | |
c2033b00 VB |
4105 | min_priority = (order > PAGE_ALLOC_COSTLY_ORDER) ? |
4106 | MIN_COMPACT_COSTLY_PRIORITY : MIN_COMPACT_PRIORITY; | |
65190cff | 4107 | |
c2033b00 | 4108 | if (*compact_priority > min_priority) { |
d9436498 VB |
4109 | (*compact_priority)--; |
4110 | *compaction_retries = 0; | |
65190cff | 4111 | ret = true; |
d9436498 | 4112 | } |
65190cff MH |
4113 | out: |
4114 | trace_compact_retry(order, priority, compact_result, retries, max_retries, ret); | |
4115 | return ret; | |
3250845d | 4116 | } |
56de7263 MG |
4117 | #else |
4118 | static inline struct page * | |
4119 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
c603844b | 4120 | unsigned int alloc_flags, const struct alloc_context *ac, |
a5508cd8 | 4121 | enum compact_priority prio, enum compact_result *compact_result) |
56de7263 | 4122 | { |
33c2d214 | 4123 | *compact_result = COMPACT_SKIPPED; |
56de7263 MG |
4124 | return NULL; |
4125 | } | |
33c2d214 MH |
4126 | |
4127 | static inline bool | |
86a294a8 MH |
4128 | should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_flags, |
4129 | enum compact_result compact_result, | |
a5508cd8 | 4130 | enum compact_priority *compact_priority, |
d9436498 | 4131 | int *compaction_retries) |
33c2d214 | 4132 | { |
31e49bfd MH |
4133 | struct zone *zone; |
4134 | struct zoneref *z; | |
4135 | ||
4136 | if (!order || order > PAGE_ALLOC_COSTLY_ORDER) | |
4137 | return false; | |
4138 | ||
4139 | /* | |
4140 | * There are setups with compaction disabled which would prefer to loop | |
4141 | * inside the allocator rather than hit the oom killer prematurely. | |
4142 | * Let's give them a good hope and keep retrying while the order-0 | |
4143 | * watermarks are OK. | |
4144 | */ | |
97a225e6 JK |
4145 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, |
4146 | ac->highest_zoneidx, ac->nodemask) { | |
31e49bfd | 4147 | if (zone_watermark_ok(zone, 0, min_wmark_pages(zone), |
97a225e6 | 4148 | ac->highest_zoneidx, alloc_flags)) |
31e49bfd MH |
4149 | return true; |
4150 | } | |
33c2d214 MH |
4151 | return false; |
4152 | } | |
3250845d | 4153 | #endif /* CONFIG_COMPACTION */ |
56de7263 | 4154 | |
d92a8cfc | 4155 | #ifdef CONFIG_LOCKDEP |
93781325 | 4156 | static struct lockdep_map __fs_reclaim_map = |
d92a8cfc PZ |
4157 | STATIC_LOCKDEP_MAP_INIT("fs_reclaim", &__fs_reclaim_map); |
4158 | ||
4159 | static bool __need_fs_reclaim(gfp_t gfp_mask) | |
4160 | { | |
4161 | gfp_mask = current_gfp_context(gfp_mask); | |
4162 | ||
4163 | /* no reclaim without waiting on it */ | |
4164 | if (!(gfp_mask & __GFP_DIRECT_RECLAIM)) | |
4165 | return false; | |
4166 | ||
4167 | /* this guy won't enter reclaim */ | |
2e517d68 | 4168 | if (current->flags & PF_MEMALLOC) |
d92a8cfc PZ |
4169 | return false; |
4170 | ||
4171 | /* We're only interested __GFP_FS allocations for now */ | |
4172 | if (!(gfp_mask & __GFP_FS)) | |
4173 | return false; | |
4174 | ||
4175 | if (gfp_mask & __GFP_NOLOCKDEP) | |
4176 | return false; | |
4177 | ||
4178 | return true; | |
4179 | } | |
4180 | ||
93781325 OS |
4181 | void __fs_reclaim_acquire(void) |
4182 | { | |
4183 | lock_map_acquire(&__fs_reclaim_map); | |
4184 | } | |
4185 | ||
4186 | void __fs_reclaim_release(void) | |
4187 | { | |
4188 | lock_map_release(&__fs_reclaim_map); | |
4189 | } | |
4190 | ||
d92a8cfc PZ |
4191 | void fs_reclaim_acquire(gfp_t gfp_mask) |
4192 | { | |
4193 | if (__need_fs_reclaim(gfp_mask)) | |
93781325 | 4194 | __fs_reclaim_acquire(); |
d92a8cfc PZ |
4195 | } |
4196 | EXPORT_SYMBOL_GPL(fs_reclaim_acquire); | |
4197 | ||
4198 | void fs_reclaim_release(gfp_t gfp_mask) | |
4199 | { | |
4200 | if (__need_fs_reclaim(gfp_mask)) | |
93781325 | 4201 | __fs_reclaim_release(); |
d92a8cfc PZ |
4202 | } |
4203 | EXPORT_SYMBOL_GPL(fs_reclaim_release); | |
4204 | #endif | |
4205 | ||
bba90710 MS |
4206 | /* Perform direct synchronous page reclaim */ |
4207 | static int | |
a9263751 VB |
4208 | __perform_reclaim(gfp_t gfp_mask, unsigned int order, |
4209 | const struct alloc_context *ac) | |
11e33f6a | 4210 | { |
bba90710 | 4211 | int progress; |
499118e9 | 4212 | unsigned int noreclaim_flag; |
eb414681 | 4213 | unsigned long pflags; |
11e33f6a MG |
4214 | |
4215 | cond_resched(); | |
4216 | ||
4217 | /* We now go into synchronous reclaim */ | |
4218 | cpuset_memory_pressure_bump(); | |
eb414681 | 4219 | psi_memstall_enter(&pflags); |
d92a8cfc | 4220 | fs_reclaim_acquire(gfp_mask); |
93781325 | 4221 | noreclaim_flag = memalloc_noreclaim_save(); |
11e33f6a | 4222 | |
a9263751 VB |
4223 | progress = try_to_free_pages(ac->zonelist, order, gfp_mask, |
4224 | ac->nodemask); | |
11e33f6a | 4225 | |
499118e9 | 4226 | memalloc_noreclaim_restore(noreclaim_flag); |
93781325 | 4227 | fs_reclaim_release(gfp_mask); |
eb414681 | 4228 | psi_memstall_leave(&pflags); |
11e33f6a MG |
4229 | |
4230 | cond_resched(); | |
4231 | ||
bba90710 MS |
4232 | return progress; |
4233 | } | |
4234 | ||
4235 | /* The really slow allocator path where we enter direct reclaim */ | |
4236 | static inline struct page * | |
4237 | __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, | |
c603844b | 4238 | unsigned int alloc_flags, const struct alloc_context *ac, |
a9263751 | 4239 | unsigned long *did_some_progress) |
bba90710 MS |
4240 | { |
4241 | struct page *page = NULL; | |
4242 | bool drained = false; | |
4243 | ||
a9263751 | 4244 | *did_some_progress = __perform_reclaim(gfp_mask, order, ac); |
9ee493ce MG |
4245 | if (unlikely(!(*did_some_progress))) |
4246 | return NULL; | |
11e33f6a | 4247 | |
9ee493ce | 4248 | retry: |
31a6c190 | 4249 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); |
9ee493ce MG |
4250 | |
4251 | /* | |
4252 | * If an allocation failed after direct reclaim, it could be because | |
0aaa29a5 MG |
4253 | * pages are pinned on the per-cpu lists or in high alloc reserves. |
4254 | * Shrink them them and try again | |
9ee493ce MG |
4255 | */ |
4256 | if (!page && !drained) { | |
29fac03b | 4257 | unreserve_highatomic_pageblock(ac, false); |
93481ff0 | 4258 | drain_all_pages(NULL); |
9ee493ce MG |
4259 | drained = true; |
4260 | goto retry; | |
4261 | } | |
4262 | ||
11e33f6a MG |
4263 | return page; |
4264 | } | |
4265 | ||
5ecd9d40 DR |
4266 | static void wake_all_kswapds(unsigned int order, gfp_t gfp_mask, |
4267 | const struct alloc_context *ac) | |
3a025760 JW |
4268 | { |
4269 | struct zoneref *z; | |
4270 | struct zone *zone; | |
e1a55637 | 4271 | pg_data_t *last_pgdat = NULL; |
97a225e6 | 4272 | enum zone_type highest_zoneidx = ac->highest_zoneidx; |
3a025760 | 4273 | |
97a225e6 | 4274 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, highest_zoneidx, |
5ecd9d40 | 4275 | ac->nodemask) { |
e1a55637 | 4276 | if (last_pgdat != zone->zone_pgdat) |
97a225e6 | 4277 | wakeup_kswapd(zone, gfp_mask, order, highest_zoneidx); |
e1a55637 MG |
4278 | last_pgdat = zone->zone_pgdat; |
4279 | } | |
3a025760 JW |
4280 | } |
4281 | ||
c603844b | 4282 | static inline unsigned int |
341ce06f PZ |
4283 | gfp_to_alloc_flags(gfp_t gfp_mask) |
4284 | { | |
c603844b | 4285 | unsigned int alloc_flags = ALLOC_WMARK_MIN | ALLOC_CPUSET; |
1da177e4 | 4286 | |
736838e9 MN |
4287 | /* |
4288 | * __GFP_HIGH is assumed to be the same as ALLOC_HIGH | |
4289 | * and __GFP_KSWAPD_RECLAIM is assumed to be the same as ALLOC_KSWAPD | |
4290 | * to save two branches. | |
4291 | */ | |
e6223a3b | 4292 | BUILD_BUG_ON(__GFP_HIGH != (__force gfp_t) ALLOC_HIGH); |
736838e9 | 4293 | BUILD_BUG_ON(__GFP_KSWAPD_RECLAIM != (__force gfp_t) ALLOC_KSWAPD); |
933e312e | 4294 | |
341ce06f PZ |
4295 | /* |
4296 | * The caller may dip into page reserves a bit more if the caller | |
4297 | * cannot run direct reclaim, or if the caller has realtime scheduling | |
4298 | * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will | |
d0164adc | 4299 | * set both ALLOC_HARDER (__GFP_ATOMIC) and ALLOC_HIGH (__GFP_HIGH). |
341ce06f | 4300 | */ |
736838e9 MN |
4301 | alloc_flags |= (__force int) |
4302 | (gfp_mask & (__GFP_HIGH | __GFP_KSWAPD_RECLAIM)); | |
1da177e4 | 4303 | |
d0164adc | 4304 | if (gfp_mask & __GFP_ATOMIC) { |
5c3240d9 | 4305 | /* |
b104a35d DR |
4306 | * Not worth trying to allocate harder for __GFP_NOMEMALLOC even |
4307 | * if it can't schedule. | |
5c3240d9 | 4308 | */ |
b104a35d | 4309 | if (!(gfp_mask & __GFP_NOMEMALLOC)) |
5c3240d9 | 4310 | alloc_flags |= ALLOC_HARDER; |
523b9458 | 4311 | /* |
b104a35d | 4312 | * Ignore cpuset mems for GFP_ATOMIC rather than fail, see the |
344736f2 | 4313 | * comment for __cpuset_node_allowed(). |
523b9458 | 4314 | */ |
341ce06f | 4315 | alloc_flags &= ~ALLOC_CPUSET; |
c06b1fca | 4316 | } else if (unlikely(rt_task(current)) && !in_interrupt()) |
341ce06f PZ |
4317 | alloc_flags |= ALLOC_HARDER; |
4318 | ||
d883c6cf | 4319 | #ifdef CONFIG_CMA |
01c0bfe0 | 4320 | if (gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE) |
d883c6cf JK |
4321 | alloc_flags |= ALLOC_CMA; |
4322 | #endif | |
341ce06f PZ |
4323 | return alloc_flags; |
4324 | } | |
4325 | ||
cd04ae1e | 4326 | static bool oom_reserves_allowed(struct task_struct *tsk) |
072bb0aa | 4327 | { |
cd04ae1e MH |
4328 | if (!tsk_is_oom_victim(tsk)) |
4329 | return false; | |
4330 | ||
4331 | /* | |
4332 | * !MMU doesn't have oom reaper so give access to memory reserves | |
4333 | * only to the thread with TIF_MEMDIE set | |
4334 | */ | |
4335 | if (!IS_ENABLED(CONFIG_MMU) && !test_thread_flag(TIF_MEMDIE)) | |
31a6c190 VB |
4336 | return false; |
4337 | ||
cd04ae1e MH |
4338 | return true; |
4339 | } | |
4340 | ||
4341 | /* | |
4342 | * Distinguish requests which really need access to full memory | |
4343 | * reserves from oom victims which can live with a portion of it | |
4344 | */ | |
4345 | static inline int __gfp_pfmemalloc_flags(gfp_t gfp_mask) | |
4346 | { | |
4347 | if (unlikely(gfp_mask & __GFP_NOMEMALLOC)) | |
4348 | return 0; | |
31a6c190 | 4349 | if (gfp_mask & __GFP_MEMALLOC) |
cd04ae1e | 4350 | return ALLOC_NO_WATERMARKS; |
31a6c190 | 4351 | if (in_serving_softirq() && (current->flags & PF_MEMALLOC)) |
cd04ae1e MH |
4352 | return ALLOC_NO_WATERMARKS; |
4353 | if (!in_interrupt()) { | |
4354 | if (current->flags & PF_MEMALLOC) | |
4355 | return ALLOC_NO_WATERMARKS; | |
4356 | else if (oom_reserves_allowed(current)) | |
4357 | return ALLOC_OOM; | |
4358 | } | |
31a6c190 | 4359 | |
cd04ae1e MH |
4360 | return 0; |
4361 | } | |
4362 | ||
4363 | bool gfp_pfmemalloc_allowed(gfp_t gfp_mask) | |
4364 | { | |
4365 | return !!__gfp_pfmemalloc_flags(gfp_mask); | |
072bb0aa MG |
4366 | } |
4367 | ||
0a0337e0 MH |
4368 | /* |
4369 | * Checks whether it makes sense to retry the reclaim to make a forward progress | |
4370 | * for the given allocation request. | |
491d79ae JW |
4371 | * |
4372 | * We give up when we either have tried MAX_RECLAIM_RETRIES in a row | |
4373 | * without success, or when we couldn't even meet the watermark if we | |
4374 | * reclaimed all remaining pages on the LRU lists. | |
0a0337e0 MH |
4375 | * |
4376 | * Returns true if a retry is viable or false to enter the oom path. | |
4377 | */ | |
4378 | static inline bool | |
4379 | should_reclaim_retry(gfp_t gfp_mask, unsigned order, | |
4380 | struct alloc_context *ac, int alloc_flags, | |
423b452e | 4381 | bool did_some_progress, int *no_progress_loops) |
0a0337e0 MH |
4382 | { |
4383 | struct zone *zone; | |
4384 | struct zoneref *z; | |
15f570bf | 4385 | bool ret = false; |
0a0337e0 | 4386 | |
423b452e VB |
4387 | /* |
4388 | * Costly allocations might have made a progress but this doesn't mean | |
4389 | * their order will become available due to high fragmentation so | |
4390 | * always increment the no progress counter for them | |
4391 | */ | |
4392 | if (did_some_progress && order <= PAGE_ALLOC_COSTLY_ORDER) | |
4393 | *no_progress_loops = 0; | |
4394 | else | |
4395 | (*no_progress_loops)++; | |
4396 | ||
0a0337e0 MH |
4397 | /* |
4398 | * Make sure we converge to OOM if we cannot make any progress | |
4399 | * several times in the row. | |
4400 | */ | |
04c8716f MK |
4401 | if (*no_progress_loops > MAX_RECLAIM_RETRIES) { |
4402 | /* Before OOM, exhaust highatomic_reserve */ | |
29fac03b | 4403 | return unreserve_highatomic_pageblock(ac, true); |
04c8716f | 4404 | } |
0a0337e0 | 4405 | |
bca67592 MG |
4406 | /* |
4407 | * Keep reclaiming pages while there is a chance this will lead | |
4408 | * somewhere. If none of the target zones can satisfy our allocation | |
4409 | * request even if all reclaimable pages are considered then we are | |
4410 | * screwed and have to go OOM. | |
0a0337e0 | 4411 | */ |
97a225e6 JK |
4412 | for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, |
4413 | ac->highest_zoneidx, ac->nodemask) { | |
0a0337e0 | 4414 | unsigned long available; |
ede37713 | 4415 | unsigned long reclaimable; |
d379f01d MH |
4416 | unsigned long min_wmark = min_wmark_pages(zone); |
4417 | bool wmark; | |
0a0337e0 | 4418 | |
5a1c84b4 | 4419 | available = reclaimable = zone_reclaimable_pages(zone); |
5a1c84b4 | 4420 | available += zone_page_state_snapshot(zone, NR_FREE_PAGES); |
0a0337e0 MH |
4421 | |
4422 | /* | |
491d79ae JW |
4423 | * Would the allocation succeed if we reclaimed all |
4424 | * reclaimable pages? | |
0a0337e0 | 4425 | */ |
d379f01d | 4426 | wmark = __zone_watermark_ok(zone, order, min_wmark, |
97a225e6 | 4427 | ac->highest_zoneidx, alloc_flags, available); |
d379f01d MH |
4428 | trace_reclaim_retry_zone(z, order, reclaimable, |
4429 | available, min_wmark, *no_progress_loops, wmark); | |
4430 | if (wmark) { | |
ede37713 MH |
4431 | /* |
4432 | * If we didn't make any progress and have a lot of | |
4433 | * dirty + writeback pages then we should wait for | |
4434 | * an IO to complete to slow down the reclaim and | |
4435 | * prevent from pre mature OOM | |
4436 | */ | |
4437 | if (!did_some_progress) { | |
11fb9989 | 4438 | unsigned long write_pending; |
ede37713 | 4439 | |
5a1c84b4 MG |
4440 | write_pending = zone_page_state_snapshot(zone, |
4441 | NR_ZONE_WRITE_PENDING); | |
ede37713 | 4442 | |
11fb9989 | 4443 | if (2 * write_pending > reclaimable) { |
ede37713 MH |
4444 | congestion_wait(BLK_RW_ASYNC, HZ/10); |
4445 | return true; | |
4446 | } | |
4447 | } | |
5a1c84b4 | 4448 | |
15f570bf MH |
4449 | ret = true; |
4450 | goto out; | |
0a0337e0 MH |
4451 | } |
4452 | } | |
4453 | ||
15f570bf MH |
4454 | out: |
4455 | /* | |
4456 | * Memory allocation/reclaim might be called from a WQ context and the | |
4457 | * current implementation of the WQ concurrency control doesn't | |
4458 | * recognize that a particular WQ is congested if the worker thread is | |
4459 | * looping without ever sleeping. Therefore we have to do a short sleep | |
4460 | * here rather than calling cond_resched(). | |
4461 | */ | |
4462 | if (current->flags & PF_WQ_WORKER) | |
4463 | schedule_timeout_uninterruptible(1); | |
4464 | else | |
4465 | cond_resched(); | |
4466 | return ret; | |
0a0337e0 MH |
4467 | } |
4468 | ||
902b6281 VB |
4469 | static inline bool |
4470 | check_retry_cpuset(int cpuset_mems_cookie, struct alloc_context *ac) | |
4471 | { | |
4472 | /* | |
4473 | * It's possible that cpuset's mems_allowed and the nodemask from | |
4474 | * mempolicy don't intersect. This should be normally dealt with by | |
4475 | * policy_nodemask(), but it's possible to race with cpuset update in | |
4476 | * such a way the check therein was true, and then it became false | |
4477 | * before we got our cpuset_mems_cookie here. | |
4478 | * This assumes that for all allocations, ac->nodemask can come only | |
4479 | * from MPOL_BIND mempolicy (whose documented semantics is to be ignored | |
4480 | * when it does not intersect with the cpuset restrictions) or the | |
4481 | * caller can deal with a violated nodemask. | |
4482 | */ | |
4483 | if (cpusets_enabled() && ac->nodemask && | |
4484 | !cpuset_nodemask_valid_mems_allowed(ac->nodemask)) { | |
4485 | ac->nodemask = NULL; | |
4486 | return true; | |
4487 | } | |
4488 | ||
4489 | /* | |
4490 | * When updating a task's mems_allowed or mempolicy nodemask, it is | |
4491 | * possible to race with parallel threads in such a way that our | |
4492 | * allocation can fail while the mask is being updated. If we are about | |
4493 | * to fail, check if the cpuset changed during allocation and if so, | |
4494 | * retry. | |
4495 | */ | |
4496 | if (read_mems_allowed_retry(cpuset_mems_cookie)) | |
4497 | return true; | |
4498 | ||
4499 | return false; | |
4500 | } | |
4501 | ||
11e33f6a MG |
4502 | static inline struct page * |
4503 | __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, | |
a9263751 | 4504 | struct alloc_context *ac) |
11e33f6a | 4505 | { |
d0164adc | 4506 | bool can_direct_reclaim = gfp_mask & __GFP_DIRECT_RECLAIM; |
282722b0 | 4507 | const bool costly_order = order > PAGE_ALLOC_COSTLY_ORDER; |
11e33f6a | 4508 | struct page *page = NULL; |
c603844b | 4509 | unsigned int alloc_flags; |
11e33f6a | 4510 | unsigned long did_some_progress; |
5ce9bfef | 4511 | enum compact_priority compact_priority; |
c5d01d0d | 4512 | enum compact_result compact_result; |
5ce9bfef VB |
4513 | int compaction_retries; |
4514 | int no_progress_loops; | |
5ce9bfef | 4515 | unsigned int cpuset_mems_cookie; |
cd04ae1e | 4516 | int reserve_flags; |
1da177e4 | 4517 | |
d0164adc MG |
4518 | /* |
4519 | * We also sanity check to catch abuse of atomic reserves being used by | |
4520 | * callers that are not in atomic context. | |
4521 | */ | |
4522 | if (WARN_ON_ONCE((gfp_mask & (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM)) == | |
4523 | (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM))) | |
4524 | gfp_mask &= ~__GFP_ATOMIC; | |
4525 | ||
5ce9bfef VB |
4526 | retry_cpuset: |
4527 | compaction_retries = 0; | |
4528 | no_progress_loops = 0; | |
4529 | compact_priority = DEF_COMPACT_PRIORITY; | |
4530 | cpuset_mems_cookie = read_mems_allowed_begin(); | |
9a67f648 MH |
4531 | |
4532 | /* | |
4533 | * The fast path uses conservative alloc_flags to succeed only until | |
4534 | * kswapd needs to be woken up, and to avoid the cost of setting up | |
4535 | * alloc_flags precisely. So we do that now. | |
4536 | */ | |
4537 | alloc_flags = gfp_to_alloc_flags(gfp_mask); | |
4538 | ||
e47483bc VB |
4539 | /* |
4540 | * We need to recalculate the starting point for the zonelist iterator | |
4541 | * because we might have used different nodemask in the fast path, or | |
4542 | * there was a cpuset modification and we are retrying - otherwise we | |
4543 | * could end up iterating over non-eligible zones endlessly. | |
4544 | */ | |
4545 | ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, | |
97a225e6 | 4546 | ac->highest_zoneidx, ac->nodemask); |
e47483bc VB |
4547 | if (!ac->preferred_zoneref->zone) |
4548 | goto nopage; | |
4549 | ||
0a79cdad | 4550 | if (alloc_flags & ALLOC_KSWAPD) |
5ecd9d40 | 4551 | wake_all_kswapds(order, gfp_mask, ac); |
23771235 VB |
4552 | |
4553 | /* | |
4554 | * The adjusted alloc_flags might result in immediate success, so try | |
4555 | * that first | |
4556 | */ | |
4557 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); | |
4558 | if (page) | |
4559 | goto got_pg; | |
4560 | ||
a8161d1e VB |
4561 | /* |
4562 | * For costly allocations, try direct compaction first, as it's likely | |
282722b0 VB |
4563 | * that we have enough base pages and don't need to reclaim. For non- |
4564 | * movable high-order allocations, do that as well, as compaction will | |
4565 | * try prevent permanent fragmentation by migrating from blocks of the | |
4566 | * same migratetype. | |
4567 | * Don't try this for allocations that are allowed to ignore | |
4568 | * watermarks, as the ALLOC_NO_WATERMARKS attempt didn't yet happen. | |
a8161d1e | 4569 | */ |
282722b0 VB |
4570 | if (can_direct_reclaim && |
4571 | (costly_order || | |
4572 | (order > 0 && ac->migratetype != MIGRATE_MOVABLE)) | |
4573 | && !gfp_pfmemalloc_allowed(gfp_mask)) { | |
a8161d1e VB |
4574 | page = __alloc_pages_direct_compact(gfp_mask, order, |
4575 | alloc_flags, ac, | |
a5508cd8 | 4576 | INIT_COMPACT_PRIORITY, |
a8161d1e VB |
4577 | &compact_result); |
4578 | if (page) | |
4579 | goto got_pg; | |
4580 | ||
cc638f32 VB |
4581 | /* |
4582 | * Checks for costly allocations with __GFP_NORETRY, which | |
4583 | * includes some THP page fault allocations | |
4584 | */ | |
4585 | if (costly_order && (gfp_mask & __GFP_NORETRY)) { | |
b39d0ee2 DR |
4586 | /* |
4587 | * If allocating entire pageblock(s) and compaction | |
4588 | * failed because all zones are below low watermarks | |
4589 | * or is prohibited because it recently failed at this | |
3f36d866 DR |
4590 | * order, fail immediately unless the allocator has |
4591 | * requested compaction and reclaim retry. | |
b39d0ee2 DR |
4592 | * |
4593 | * Reclaim is | |
4594 | * - potentially very expensive because zones are far | |
4595 | * below their low watermarks or this is part of very | |
4596 | * bursty high order allocations, | |
4597 | * - not guaranteed to help because isolate_freepages() | |
4598 | * may not iterate over freed pages as part of its | |
4599 | * linear scan, and | |
4600 | * - unlikely to make entire pageblocks free on its | |
4601 | * own. | |
4602 | */ | |
4603 | if (compact_result == COMPACT_SKIPPED || | |
4604 | compact_result == COMPACT_DEFERRED) | |
4605 | goto nopage; | |
a8161d1e | 4606 | |
a8161d1e | 4607 | /* |
3eb2771b VB |
4608 | * Looks like reclaim/compaction is worth trying, but |
4609 | * sync compaction could be very expensive, so keep | |
25160354 | 4610 | * using async compaction. |
a8161d1e | 4611 | */ |
a5508cd8 | 4612 | compact_priority = INIT_COMPACT_PRIORITY; |
a8161d1e VB |
4613 | } |
4614 | } | |
23771235 | 4615 | |
31a6c190 | 4616 | retry: |
23771235 | 4617 | /* Ensure kswapd doesn't accidentally go to sleep as long as we loop */ |
0a79cdad | 4618 | if (alloc_flags & ALLOC_KSWAPD) |
5ecd9d40 | 4619 | wake_all_kswapds(order, gfp_mask, ac); |
31a6c190 | 4620 | |
cd04ae1e MH |
4621 | reserve_flags = __gfp_pfmemalloc_flags(gfp_mask); |
4622 | if (reserve_flags) | |
4623 | alloc_flags = reserve_flags; | |
23771235 | 4624 | |
e46e7b77 | 4625 | /* |
d6a24df0 VB |
4626 | * Reset the nodemask and zonelist iterators if memory policies can be |
4627 | * ignored. These allocations are high priority and system rather than | |
4628 | * user oriented. | |
e46e7b77 | 4629 | */ |
cd04ae1e | 4630 | if (!(alloc_flags & ALLOC_CPUSET) || reserve_flags) { |
d6a24df0 | 4631 | ac->nodemask = NULL; |
e46e7b77 | 4632 | ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, |
97a225e6 | 4633 | ac->highest_zoneidx, ac->nodemask); |
e46e7b77 MG |
4634 | } |
4635 | ||
23771235 | 4636 | /* Attempt with potentially adjusted zonelist and alloc_flags */ |
31a6c190 | 4637 | page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac); |
7fb1d9fc RS |
4638 | if (page) |
4639 | goto got_pg; | |
1da177e4 | 4640 | |
d0164adc | 4641 | /* Caller is not willing to reclaim, we can't balance anything */ |
9a67f648 | 4642 | if (!can_direct_reclaim) |
1da177e4 LT |
4643 | goto nopage; |
4644 | ||
9a67f648 MH |
4645 | /* Avoid recursion of direct reclaim */ |
4646 | if (current->flags & PF_MEMALLOC) | |
6583bb64 DR |
4647 | goto nopage; |
4648 | ||
a8161d1e VB |
4649 | /* Try direct reclaim and then allocating */ |
4650 | page = __alloc_pages_direct_reclaim(gfp_mask, order, alloc_flags, ac, | |
4651 | &did_some_progress); | |
4652 | if (page) | |
4653 | goto got_pg; | |
4654 | ||
4655 | /* Try direct compaction and then allocating */ | |
a9263751 | 4656 | page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, ac, |
a5508cd8 | 4657 | compact_priority, &compact_result); |
56de7263 MG |
4658 | if (page) |
4659 | goto got_pg; | |
75f30861 | 4660 | |
9083905a JW |
4661 | /* Do not loop if specifically requested */ |
4662 | if (gfp_mask & __GFP_NORETRY) | |
a8161d1e | 4663 | goto nopage; |
9083905a | 4664 | |
0a0337e0 MH |
4665 | /* |
4666 | * Do not retry costly high order allocations unless they are | |
dcda9b04 | 4667 | * __GFP_RETRY_MAYFAIL |
0a0337e0 | 4668 | */ |
dcda9b04 | 4669 | if (costly_order && !(gfp_mask & __GFP_RETRY_MAYFAIL)) |
a8161d1e | 4670 | goto nopage; |
0a0337e0 | 4671 | |
0a0337e0 | 4672 | if (should_reclaim_retry(gfp_mask, order, ac, alloc_flags, |
423b452e | 4673 | did_some_progress > 0, &no_progress_loops)) |
0a0337e0 MH |
4674 | goto retry; |
4675 | ||
33c2d214 MH |
4676 | /* |
4677 | * It doesn't make any sense to retry for the compaction if the order-0 | |
4678 | * reclaim is not able to make any progress because the current | |
4679 | * implementation of the compaction depends on the sufficient amount | |
4680 | * of free memory (see __compaction_suitable) | |
4681 | */ | |
4682 | if (did_some_progress > 0 && | |
86a294a8 | 4683 | should_compact_retry(ac, order, alloc_flags, |
a5508cd8 | 4684 | compact_result, &compact_priority, |
d9436498 | 4685 | &compaction_retries)) |
33c2d214 MH |
4686 | goto retry; |
4687 | ||
902b6281 VB |
4688 | |
4689 | /* Deal with possible cpuset update races before we start OOM killing */ | |
4690 | if (check_retry_cpuset(cpuset_mems_cookie, ac)) | |
e47483bc VB |
4691 | goto retry_cpuset; |
4692 | ||
9083905a JW |
4693 | /* Reclaim has failed us, start killing things */ |
4694 | page = __alloc_pages_may_oom(gfp_mask, order, ac, &did_some_progress); | |
4695 | if (page) | |
4696 | goto got_pg; | |
4697 | ||
9a67f648 | 4698 | /* Avoid allocations with no watermarks from looping endlessly */ |
cd04ae1e MH |
4699 | if (tsk_is_oom_victim(current) && |
4700 | (alloc_flags == ALLOC_OOM || | |
c288983d | 4701 | (gfp_mask & __GFP_NOMEMALLOC))) |
9a67f648 MH |
4702 | goto nopage; |
4703 | ||
9083905a | 4704 | /* Retry as long as the OOM killer is making progress */ |
0a0337e0 MH |
4705 | if (did_some_progress) { |
4706 | no_progress_loops = 0; | |
9083905a | 4707 | goto retry; |
0a0337e0 | 4708 | } |
9083905a | 4709 | |
1da177e4 | 4710 | nopage: |
902b6281 VB |
4711 | /* Deal with possible cpuset update races before we fail */ |
4712 | if (check_retry_cpuset(cpuset_mems_cookie, ac)) | |
5ce9bfef VB |
4713 | goto retry_cpuset; |
4714 | ||
9a67f648 MH |
4715 | /* |
4716 | * Make sure that __GFP_NOFAIL request doesn't leak out and make sure | |
4717 | * we always retry | |
4718 | */ | |
4719 | if (gfp_mask & __GFP_NOFAIL) { | |
4720 | /* | |
4721 | * All existing users of the __GFP_NOFAIL are blockable, so warn | |
4722 | * of any new users that actually require GFP_NOWAIT | |
4723 | */ | |
4724 | if (WARN_ON_ONCE(!can_direct_reclaim)) | |
4725 | goto fail; | |
4726 | ||
4727 | /* | |
4728 | * PF_MEMALLOC request from this context is rather bizarre | |
4729 | * because we cannot reclaim anything and only can loop waiting | |
4730 | * for somebody to do a work for us | |
4731 | */ | |
4732 | WARN_ON_ONCE(current->flags & PF_MEMALLOC); | |
4733 | ||
4734 | /* | |
4735 | * non failing costly orders are a hard requirement which we | |
4736 | * are not prepared for much so let's warn about these users | |
4737 | * so that we can identify them and convert them to something | |
4738 | * else. | |
4739 | */ | |
4740 | WARN_ON_ONCE(order > PAGE_ALLOC_COSTLY_ORDER); | |
4741 | ||
6c18ba7a MH |
4742 | /* |
4743 | * Help non-failing allocations by giving them access to memory | |
4744 | * reserves but do not use ALLOC_NO_WATERMARKS because this | |
4745 | * could deplete whole memory reserves which would just make | |
4746 | * the situation worse | |
4747 | */ | |
4748 | page = __alloc_pages_cpuset_fallback(gfp_mask, order, ALLOC_HARDER, ac); | |
4749 | if (page) | |
4750 | goto got_pg; | |
4751 | ||
9a67f648 MH |
4752 | cond_resched(); |
4753 | goto retry; | |
4754 | } | |
4755 | fail: | |
a8e99259 | 4756 | warn_alloc(gfp_mask, ac->nodemask, |
7877cdcc | 4757 | "page allocation failure: order:%u", order); |
1da177e4 | 4758 | got_pg: |
072bb0aa | 4759 | return page; |
1da177e4 | 4760 | } |
11e33f6a | 4761 | |
9cd75558 | 4762 | static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order, |
04ec6264 | 4763 | int preferred_nid, nodemask_t *nodemask, |
9cd75558 MG |
4764 | struct alloc_context *ac, gfp_t *alloc_mask, |
4765 | unsigned int *alloc_flags) | |
11e33f6a | 4766 | { |
97a225e6 | 4767 | ac->highest_zoneidx = gfp_zone(gfp_mask); |
04ec6264 | 4768 | ac->zonelist = node_zonelist(preferred_nid, gfp_mask); |
9cd75558 | 4769 | ac->nodemask = nodemask; |
01c0bfe0 | 4770 | ac->migratetype = gfp_migratetype(gfp_mask); |
11e33f6a | 4771 | |
682a3385 | 4772 | if (cpusets_enabled()) { |
9cd75558 | 4773 | *alloc_mask |= __GFP_HARDWALL; |
9cd75558 MG |
4774 | if (!ac->nodemask) |
4775 | ac->nodemask = &cpuset_current_mems_allowed; | |
51047820 VB |
4776 | else |
4777 | *alloc_flags |= ALLOC_CPUSET; | |
682a3385 MG |
4778 | } |
4779 | ||
d92a8cfc PZ |
4780 | fs_reclaim_acquire(gfp_mask); |
4781 | fs_reclaim_release(gfp_mask); | |
11e33f6a | 4782 | |
d0164adc | 4783 | might_sleep_if(gfp_mask & __GFP_DIRECT_RECLAIM); |
11e33f6a MG |
4784 | |
4785 | if (should_fail_alloc_page(gfp_mask, order)) | |
9cd75558 | 4786 | return false; |
11e33f6a | 4787 | |
d883c6cf JK |
4788 | if (IS_ENABLED(CONFIG_CMA) && ac->migratetype == MIGRATE_MOVABLE) |
4789 | *alloc_flags |= ALLOC_CMA; | |
4790 | ||
9cd75558 MG |
4791 | return true; |
4792 | } | |
21bb9bd1 | 4793 | |
9cd75558 | 4794 | /* Determine whether to spread dirty pages and what the first usable zone */ |
a380b40a | 4795 | static inline void finalise_ac(gfp_t gfp_mask, struct alloc_context *ac) |
9cd75558 | 4796 | { |
c9ab0c4f | 4797 | /* Dirty zone balancing only done in the fast path */ |
9cd75558 | 4798 | ac->spread_dirty_pages = (gfp_mask & __GFP_WRITE); |
c9ab0c4f | 4799 | |
e46e7b77 MG |
4800 | /* |
4801 | * The preferred zone is used for statistics but crucially it is | |
4802 | * also used as the starting point for the zonelist iterator. It | |
4803 | * may get reset for allocations that ignore memory policies. | |
4804 | */ | |
9cd75558 | 4805 | ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, |
97a225e6 | 4806 | ac->highest_zoneidx, ac->nodemask); |
9cd75558 MG |
4807 | } |
4808 | ||
4809 | /* | |
4810 | * This is the 'heart' of the zoned buddy allocator. | |
4811 | */ | |
4812 | struct page * | |
04ec6264 VB |
4813 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid, |
4814 | nodemask_t *nodemask) | |
9cd75558 MG |
4815 | { |
4816 | struct page *page; | |
4817 | unsigned int alloc_flags = ALLOC_WMARK_LOW; | |
f19360f0 | 4818 | gfp_t alloc_mask; /* The gfp_t that was actually used for allocation */ |
9cd75558 MG |
4819 | struct alloc_context ac = { }; |
4820 | ||
c63ae43b MH |
4821 | /* |
4822 | * There are several places where we assume that the order value is sane | |
4823 | * so bail out early if the request is out of bound. | |
4824 | */ | |
4825 | if (unlikely(order >= MAX_ORDER)) { | |
4826 | WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN)); | |
4827 | return NULL; | |
4828 | } | |
4829 | ||
9cd75558 | 4830 | gfp_mask &= gfp_allowed_mask; |
f19360f0 | 4831 | alloc_mask = gfp_mask; |
04ec6264 | 4832 | if (!prepare_alloc_pages(gfp_mask, order, preferred_nid, nodemask, &ac, &alloc_mask, &alloc_flags)) |
9cd75558 MG |
4833 | return NULL; |
4834 | ||
a380b40a | 4835 | finalise_ac(gfp_mask, &ac); |
5bb1b169 | 4836 | |
6bb15450 MG |
4837 | /* |
4838 | * Forbid the first pass from falling back to types that fragment | |
4839 | * memory until all local zones are considered. | |
4840 | */ | |
0a79cdad | 4841 | alloc_flags |= alloc_flags_nofragment(ac.preferred_zoneref->zone, gfp_mask); |
6bb15450 | 4842 | |
5117f45d | 4843 | /* First allocation attempt */ |
a9263751 | 4844 | page = get_page_from_freelist(alloc_mask, order, alloc_flags, &ac); |
4fcb0971 MG |
4845 | if (likely(page)) |
4846 | goto out; | |
11e33f6a | 4847 | |
4fcb0971 | 4848 | /* |
7dea19f9 MH |
4849 | * Apply scoped allocation constraints. This is mainly about GFP_NOFS |
4850 | * resp. GFP_NOIO which has to be inherited for all allocation requests | |
4851 | * from a particular context which has been marked by | |
4852 | * memalloc_no{fs,io}_{save,restore}. | |
4fcb0971 | 4853 | */ |
7dea19f9 | 4854 | alloc_mask = current_gfp_context(gfp_mask); |
4fcb0971 | 4855 | ac.spread_dirty_pages = false; |
23f086f9 | 4856 | |
4741526b MG |
4857 | /* |
4858 | * Restore the original nodemask if it was potentially replaced with | |
4859 | * &cpuset_current_mems_allowed to optimize the fast-path attempt. | |
4860 | */ | |
97ce86f9 | 4861 | ac.nodemask = nodemask; |
16096c25 | 4862 | |
4fcb0971 | 4863 | page = __alloc_pages_slowpath(alloc_mask, order, &ac); |
cc9a6c87 | 4864 | |
4fcb0971 | 4865 | out: |
c4159a75 | 4866 | if (memcg_kmem_enabled() && (gfp_mask & __GFP_ACCOUNT) && page && |
f4b00eab | 4867 | unlikely(__memcg_kmem_charge_page(page, gfp_mask, order) != 0)) { |
c4159a75 VD |
4868 | __free_pages(page, order); |
4869 | page = NULL; | |
4949148a VD |
4870 | } |
4871 | ||
4fcb0971 MG |
4872 | trace_mm_page_alloc(page, order, alloc_mask, ac.migratetype); |
4873 | ||
11e33f6a | 4874 | return page; |
1da177e4 | 4875 | } |
d239171e | 4876 | EXPORT_SYMBOL(__alloc_pages_nodemask); |
1da177e4 LT |
4877 | |
4878 | /* | |
9ea9a680 MH |
4879 | * Common helper functions. Never use with __GFP_HIGHMEM because the returned |
4880 | * address cannot represent highmem pages. Use alloc_pages and then kmap if | |
4881 | * you need to access high mem. | |
1da177e4 | 4882 | */ |
920c7a5d | 4883 | unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 4884 | { |
945a1113 AM |
4885 | struct page *page; |
4886 | ||
9ea9a680 | 4887 | page = alloc_pages(gfp_mask & ~__GFP_HIGHMEM, order); |
1da177e4 LT |
4888 | if (!page) |
4889 | return 0; | |
4890 | return (unsigned long) page_address(page); | |
4891 | } | |
1da177e4 LT |
4892 | EXPORT_SYMBOL(__get_free_pages); |
4893 | ||
920c7a5d | 4894 | unsigned long get_zeroed_page(gfp_t gfp_mask) |
1da177e4 | 4895 | { |
945a1113 | 4896 | return __get_free_pages(gfp_mask | __GFP_ZERO, 0); |
1da177e4 | 4897 | } |
1da177e4 LT |
4898 | EXPORT_SYMBOL(get_zeroed_page); |
4899 | ||
742aa7fb | 4900 | static inline void free_the_page(struct page *page, unsigned int order) |
1da177e4 | 4901 | { |
742aa7fb AL |
4902 | if (order == 0) /* Via pcp? */ |
4903 | free_unref_page(page); | |
4904 | else | |
4905 | __free_pages_ok(page, order); | |
1da177e4 LT |
4906 | } |
4907 | ||
742aa7fb AL |
4908 | void __free_pages(struct page *page, unsigned int order) |
4909 | { | |
4910 | if (put_page_testzero(page)) | |
4911 | free_the_page(page, order); | |
4912 | } | |
1da177e4 LT |
4913 | EXPORT_SYMBOL(__free_pages); |
4914 | ||
920c7a5d | 4915 | void free_pages(unsigned long addr, unsigned int order) |
1da177e4 LT |
4916 | { |
4917 | if (addr != 0) { | |
725d704e | 4918 | VM_BUG_ON(!virt_addr_valid((void *)addr)); |
1da177e4 LT |
4919 | __free_pages(virt_to_page((void *)addr), order); |
4920 | } | |
4921 | } | |
4922 | ||
4923 | EXPORT_SYMBOL(free_pages); | |
4924 | ||
b63ae8ca AD |
4925 | /* |
4926 | * Page Fragment: | |
4927 | * An arbitrary-length arbitrary-offset area of memory which resides | |
4928 | * within a 0 or higher order page. Multiple fragments within that page | |
4929 | * are individually refcounted, in the page's reference counter. | |
4930 | * | |
4931 | * The page_frag functions below provide a simple allocation framework for | |
4932 | * page fragments. This is used by the network stack and network device | |
4933 | * drivers to provide a backing region of memory for use as either an | |
4934 | * sk_buff->head, or to be used in the "frags" portion of skb_shared_info. | |
4935 | */ | |
2976db80 AD |
4936 | static struct page *__page_frag_cache_refill(struct page_frag_cache *nc, |
4937 | gfp_t gfp_mask) | |
b63ae8ca AD |
4938 | { |
4939 | struct page *page = NULL; | |
4940 | gfp_t gfp = gfp_mask; | |
4941 | ||
4942 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
4943 | gfp_mask |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY | | |
4944 | __GFP_NOMEMALLOC; | |
4945 | page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, | |
4946 | PAGE_FRAG_CACHE_MAX_ORDER); | |
4947 | nc->size = page ? PAGE_FRAG_CACHE_MAX_SIZE : PAGE_SIZE; | |
4948 | #endif | |
4949 | if (unlikely(!page)) | |
4950 | page = alloc_pages_node(NUMA_NO_NODE, gfp, 0); | |
4951 | ||
4952 | nc->va = page ? page_address(page) : NULL; | |
4953 | ||
4954 | return page; | |
4955 | } | |
4956 | ||
2976db80 | 4957 | void __page_frag_cache_drain(struct page *page, unsigned int count) |
44fdffd7 AD |
4958 | { |
4959 | VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); | |
4960 | ||
742aa7fb AL |
4961 | if (page_ref_sub_and_test(page, count)) |
4962 | free_the_page(page, compound_order(page)); | |
44fdffd7 | 4963 | } |
2976db80 | 4964 | EXPORT_SYMBOL(__page_frag_cache_drain); |
44fdffd7 | 4965 | |
8c2dd3e4 AD |
4966 | void *page_frag_alloc(struct page_frag_cache *nc, |
4967 | unsigned int fragsz, gfp_t gfp_mask) | |
b63ae8ca AD |
4968 | { |
4969 | unsigned int size = PAGE_SIZE; | |
4970 | struct page *page; | |
4971 | int offset; | |
4972 | ||
4973 | if (unlikely(!nc->va)) { | |
4974 | refill: | |
2976db80 | 4975 | page = __page_frag_cache_refill(nc, gfp_mask); |
b63ae8ca AD |
4976 | if (!page) |
4977 | return NULL; | |
4978 | ||
4979 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
4980 | /* if size can vary use size else just use PAGE_SIZE */ | |
4981 | size = nc->size; | |
4982 | #endif | |
4983 | /* Even if we own the page, we do not use atomic_set(). | |
4984 | * This would break get_page_unless_zero() users. | |
4985 | */ | |
86447726 | 4986 | page_ref_add(page, PAGE_FRAG_CACHE_MAX_SIZE); |
b63ae8ca AD |
4987 | |
4988 | /* reset page count bias and offset to start of new frag */ | |
2f064f34 | 4989 | nc->pfmemalloc = page_is_pfmemalloc(page); |
86447726 | 4990 | nc->pagecnt_bias = PAGE_FRAG_CACHE_MAX_SIZE + 1; |
b63ae8ca AD |
4991 | nc->offset = size; |
4992 | } | |
4993 | ||
4994 | offset = nc->offset - fragsz; | |
4995 | if (unlikely(offset < 0)) { | |
4996 | page = virt_to_page(nc->va); | |
4997 | ||
fe896d18 | 4998 | if (!page_ref_sub_and_test(page, nc->pagecnt_bias)) |
b63ae8ca AD |
4999 | goto refill; |
5000 | ||
5001 | #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) | |
5002 | /* if size can vary use size else just use PAGE_SIZE */ | |
5003 | size = nc->size; | |
5004 | #endif | |
5005 | /* OK, page count is 0, we can safely set it */ | |
86447726 | 5006 | set_page_count(page, PAGE_FRAG_CACHE_MAX_SIZE + 1); |
b63ae8ca AD |
5007 | |
5008 | /* reset page count bias and offset to start of new frag */ | |
86447726 | 5009 | nc->pagecnt_bias = PAGE_FRAG_CACHE_MAX_SIZE + 1; |
b63ae8ca AD |
5010 | offset = size - fragsz; |
5011 | } | |
5012 | ||
5013 | nc->pagecnt_bias--; | |
5014 | nc->offset = offset; | |
5015 | ||
5016 | return nc->va + offset; | |
5017 | } | |
8c2dd3e4 | 5018 | EXPORT_SYMBOL(page_frag_alloc); |
b63ae8ca AD |
5019 | |
5020 | /* | |
5021 | * Frees a page fragment allocated out of either a compound or order 0 page. | |
5022 | */ | |
8c2dd3e4 | 5023 | void page_frag_free(void *addr) |
b63ae8ca AD |
5024 | { |
5025 | struct page *page = virt_to_head_page(addr); | |
5026 | ||
742aa7fb AL |
5027 | if (unlikely(put_page_testzero(page))) |
5028 | free_the_page(page, compound_order(page)); | |
b63ae8ca | 5029 | } |
8c2dd3e4 | 5030 | EXPORT_SYMBOL(page_frag_free); |
b63ae8ca | 5031 | |
d00181b9 KS |
5032 | static void *make_alloc_exact(unsigned long addr, unsigned int order, |
5033 | size_t size) | |
ee85c2e1 AK |
5034 | { |
5035 | if (addr) { | |
5036 | unsigned long alloc_end = addr + (PAGE_SIZE << order); | |
5037 | unsigned long used = addr + PAGE_ALIGN(size); | |
5038 | ||
5039 | split_page(virt_to_page((void *)addr), order); | |
5040 | while (used < alloc_end) { | |
5041 | free_page(used); | |
5042 | used += PAGE_SIZE; | |
5043 | } | |
5044 | } | |
5045 | return (void *)addr; | |
5046 | } | |
5047 | ||
2be0ffe2 TT |
5048 | /** |
5049 | * alloc_pages_exact - allocate an exact number physically-contiguous pages. | |
5050 | * @size: the number of bytes to allocate | |
63931eb9 | 5051 | * @gfp_mask: GFP flags for the allocation, must not contain __GFP_COMP |
2be0ffe2 TT |
5052 | * |
5053 | * This function is similar to alloc_pages(), except that it allocates the | |
5054 | * minimum number of pages to satisfy the request. alloc_pages() can only | |
5055 | * allocate memory in power-of-two pages. | |
5056 | * | |
5057 | * This function is also limited by MAX_ORDER. | |
5058 | * | |
5059 | * Memory allocated by this function must be released by free_pages_exact(). | |
a862f68a MR |
5060 | * |
5061 | * Return: pointer to the allocated area or %NULL in case of error. | |
2be0ffe2 TT |
5062 | */ |
5063 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask) | |
5064 | { | |
5065 | unsigned int order = get_order(size); | |
5066 | unsigned long addr; | |
5067 | ||
63931eb9 VB |
5068 | if (WARN_ON_ONCE(gfp_mask & __GFP_COMP)) |
5069 | gfp_mask &= ~__GFP_COMP; | |
5070 | ||
2be0ffe2 | 5071 | addr = __get_free_pages(gfp_mask, order); |
ee85c2e1 | 5072 | return make_alloc_exact(addr, order, size); |
2be0ffe2 TT |
5073 | } |
5074 | EXPORT_SYMBOL(alloc_pages_exact); | |
5075 | ||
ee85c2e1 AK |
5076 | /** |
5077 | * alloc_pages_exact_nid - allocate an exact number of physically-contiguous | |
5078 | * pages on a node. | |
b5e6ab58 | 5079 | * @nid: the preferred node ID where memory should be allocated |
ee85c2e1 | 5080 | * @size: the number of bytes to allocate |
63931eb9 | 5081 | * @gfp_mask: GFP flags for the allocation, must not contain __GFP_COMP |
ee85c2e1 AK |
5082 | * |
5083 | * Like alloc_pages_exact(), but try to allocate on node nid first before falling | |
5084 | * back. | |
a862f68a MR |
5085 | * |
5086 | * Return: pointer to the allocated area or %NULL in case of error. | |
ee85c2e1 | 5087 | */ |
e1931811 | 5088 | void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) |
ee85c2e1 | 5089 | { |
d00181b9 | 5090 | unsigned int order = get_order(size); |
63931eb9 VB |
5091 | struct page *p; |
5092 | ||
5093 | if (WARN_ON_ONCE(gfp_mask & __GFP_COMP)) | |
5094 | gfp_mask &= ~__GFP_COMP; | |
5095 | ||
5096 | p = alloc_pages_node(nid, gfp_mask, order); | |
ee85c2e1 AK |
5097 | if (!p) |
5098 | return NULL; | |
5099 | return make_alloc_exact((unsigned long)page_address(p), order, size); | |
5100 | } | |
ee85c2e1 | 5101 | |
2be0ffe2 TT |
5102 | /** |
5103 | * free_pages_exact - release memory allocated via alloc_pages_exact() | |
5104 | * @virt: the value returned by alloc_pages_exact. | |
5105 | * @size: size of allocation, same value as passed to alloc_pages_exact(). | |
5106 | * | |
5107 | * Release the memory allocated by a previous call to alloc_pages_exact. | |
5108 | */ | |
5109 | void free_pages_exact(void *virt, size_t size) | |
5110 | { | |
5111 | unsigned long addr = (unsigned long)virt; | |
5112 | unsigned long end = addr + PAGE_ALIGN(size); | |
5113 | ||
5114 | while (addr < end) { | |
5115 | free_page(addr); | |
5116 | addr += PAGE_SIZE; | |
5117 | } | |
5118 | } | |
5119 | EXPORT_SYMBOL(free_pages_exact); | |
5120 | ||
e0fb5815 ZY |
5121 | /** |
5122 | * nr_free_zone_pages - count number of pages beyond high watermark | |
5123 | * @offset: The zone index of the highest zone | |
5124 | * | |
a862f68a | 5125 | * nr_free_zone_pages() counts the number of pages which are beyond the |
e0fb5815 ZY |
5126 | * high watermark within all zones at or below a given zone index. For each |
5127 | * zone, the number of pages is calculated as: | |
0e056eb5 | 5128 | * |
5129 | * nr_free_zone_pages = managed_pages - high_pages | |
a862f68a MR |
5130 | * |
5131 | * Return: number of pages beyond high watermark. | |
e0fb5815 | 5132 | */ |
ebec3862 | 5133 | static unsigned long nr_free_zone_pages(int offset) |
1da177e4 | 5134 | { |
dd1a239f | 5135 | struct zoneref *z; |
54a6eb5c MG |
5136 | struct zone *zone; |
5137 | ||
e310fd43 | 5138 | /* Just pick one node, since fallback list is circular */ |
ebec3862 | 5139 | unsigned long sum = 0; |
1da177e4 | 5140 | |
0e88460d | 5141 | struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL); |
1da177e4 | 5142 | |
54a6eb5c | 5143 | for_each_zone_zonelist(zone, z, zonelist, offset) { |
9705bea5 | 5144 | unsigned long size = zone_managed_pages(zone); |
41858966 | 5145 | unsigned long high = high_wmark_pages(zone); |
e310fd43 MB |
5146 | if (size > high) |
5147 | sum += size - high; | |
1da177e4 LT |
5148 | } |
5149 | ||
5150 | return sum; | |
5151 | } | |
5152 | ||
e0fb5815 ZY |
5153 | /** |
5154 | * nr_free_buffer_pages - count number of pages beyond high watermark | |
5155 | * | |
5156 | * nr_free_buffer_pages() counts the number of pages which are beyond the high | |
5157 | * watermark within ZONE_DMA and ZONE_NORMAL. | |
a862f68a MR |
5158 | * |
5159 | * Return: number of pages beyond high watermark within ZONE_DMA and | |
5160 | * ZONE_NORMAL. | |
1da177e4 | 5161 | */ |
ebec3862 | 5162 | unsigned long nr_free_buffer_pages(void) |
1da177e4 | 5163 | { |
af4ca457 | 5164 | return nr_free_zone_pages(gfp_zone(GFP_USER)); |
1da177e4 | 5165 | } |
c2f1a551 | 5166 | EXPORT_SYMBOL_GPL(nr_free_buffer_pages); |
1da177e4 | 5167 | |
e0fb5815 ZY |
5168 | /** |
5169 | * nr_free_pagecache_pages - count number of pages beyond high watermark | |
5170 | * | |
5171 | * nr_free_pagecache_pages() counts the number of pages which are beyond the | |
5172 | * high watermark within all zones. | |
a862f68a MR |
5173 | * |
5174 | * Return: number of pages beyond high watermark within all zones. | |
1da177e4 | 5175 | */ |
ebec3862 | 5176 | unsigned long nr_free_pagecache_pages(void) |
1da177e4 | 5177 | { |
2a1e274a | 5178 | return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); |
1da177e4 | 5179 | } |
08e0f6a9 CL |
5180 | |
5181 | static inline void show_node(struct zone *zone) | |
1da177e4 | 5182 | { |
e5adfffc | 5183 | if (IS_ENABLED(CONFIG_NUMA)) |
25ba77c1 | 5184 | printk("Node %d ", zone_to_nid(zone)); |
1da177e4 | 5185 | } |
1da177e4 | 5186 | |
d02bd27b IR |
5187 | long si_mem_available(void) |
5188 | { | |
5189 | long available; | |
5190 | unsigned long pagecache; | |
5191 | unsigned long wmark_low = 0; | |
5192 | unsigned long pages[NR_LRU_LISTS]; | |
b29940c1 | 5193 | unsigned long reclaimable; |
d02bd27b IR |
5194 | struct zone *zone; |
5195 | int lru; | |
5196 | ||
5197 | for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) | |
2f95ff90 | 5198 | pages[lru] = global_node_page_state(NR_LRU_BASE + lru); |
d02bd27b IR |
5199 | |
5200 | for_each_zone(zone) | |
a9214443 | 5201 | wmark_low += low_wmark_pages(zone); |
d02bd27b IR |
5202 | |
5203 | /* | |
5204 | * Estimate the amount of memory available for userspace allocations, | |
5205 | * without causing swapping. | |
5206 | */ | |
c41f012a | 5207 | available = global_zone_page_state(NR_FREE_PAGES) - totalreserve_pages; |
d02bd27b IR |
5208 | |
5209 | /* | |
5210 | * Not all the page cache can be freed, otherwise the system will | |
5211 | * start swapping. Assume at least half of the page cache, or the | |
5212 | * low watermark worth of cache, needs to stay. | |
5213 | */ | |
5214 | pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; | |
5215 | pagecache -= min(pagecache / 2, wmark_low); | |
5216 | available += pagecache; | |
5217 | ||
5218 | /* | |
b29940c1 VB |
5219 | * Part of the reclaimable slab and other kernel memory consists of |
5220 | * items that are in use, and cannot be freed. Cap this estimate at the | |
5221 | * low watermark. | |
d02bd27b | 5222 | */ |
d42f3245 RG |
5223 | reclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B) + |
5224 | global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE); | |
b29940c1 | 5225 | available += reclaimable - min(reclaimable / 2, wmark_low); |
034ebf65 | 5226 | |
d02bd27b IR |
5227 | if (available < 0) |
5228 | available = 0; | |
5229 | return available; | |
5230 | } | |
5231 | EXPORT_SYMBOL_GPL(si_mem_available); | |
5232 | ||
1da177e4 LT |
5233 | void si_meminfo(struct sysinfo *val) |
5234 | { | |
ca79b0c2 | 5235 | val->totalram = totalram_pages(); |
11fb9989 | 5236 | val->sharedram = global_node_page_state(NR_SHMEM); |
c41f012a | 5237 | val->freeram = global_zone_page_state(NR_FREE_PAGES); |
1da177e4 | 5238 | val->bufferram = nr_blockdev_pages(); |
ca79b0c2 | 5239 | val->totalhigh = totalhigh_pages(); |
1da177e4 | 5240 | val->freehigh = nr_free_highpages(); |
1da177e4 LT |
5241 | val->mem_unit = PAGE_SIZE; |
5242 | } | |
5243 | ||
5244 | EXPORT_SYMBOL(si_meminfo); | |
5245 | ||
5246 | #ifdef CONFIG_NUMA | |
5247 | void si_meminfo_node(struct sysinfo *val, int nid) | |
5248 | { | |
cdd91a77 JL |
5249 | int zone_type; /* needs to be signed */ |
5250 | unsigned long managed_pages = 0; | |
fc2bd799 JK |
5251 | unsigned long managed_highpages = 0; |
5252 | unsigned long free_highpages = 0; | |
1da177e4 LT |
5253 | pg_data_t *pgdat = NODE_DATA(nid); |
5254 | ||
cdd91a77 | 5255 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) |
9705bea5 | 5256 | managed_pages += zone_managed_pages(&pgdat->node_zones[zone_type]); |
cdd91a77 | 5257 | val->totalram = managed_pages; |
11fb9989 | 5258 | val->sharedram = node_page_state(pgdat, NR_SHMEM); |
75ef7184 | 5259 | val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES); |
98d2b0eb | 5260 | #ifdef CONFIG_HIGHMEM |
fc2bd799 JK |
5261 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { |
5262 | struct zone *zone = &pgdat->node_zones[zone_type]; | |
5263 | ||
5264 | if (is_highmem(zone)) { | |
9705bea5 | 5265 | managed_highpages += zone_managed_pages(zone); |
fc2bd799 JK |
5266 | free_highpages += zone_page_state(zone, NR_FREE_PAGES); |
5267 | } | |
5268 | } | |
5269 | val->totalhigh = managed_highpages; | |
5270 | val->freehigh = free_highpages; | |
98d2b0eb | 5271 | #else |
fc2bd799 JK |
5272 | val->totalhigh = managed_highpages; |
5273 | val->freehigh = free_highpages; | |
98d2b0eb | 5274 | #endif |
1da177e4 LT |
5275 | val->mem_unit = PAGE_SIZE; |
5276 | } | |
5277 | #endif | |
5278 | ||
ddd588b5 | 5279 | /* |
7bf02ea2 DR |
5280 | * Determine whether the node should be displayed or not, depending on whether |
5281 | * SHOW_MEM_FILTER_NODES was passed to show_free_areas(). | |
ddd588b5 | 5282 | */ |
9af744d7 | 5283 | static bool show_mem_node_skip(unsigned int flags, int nid, nodemask_t *nodemask) |
ddd588b5 | 5284 | { |
ddd588b5 | 5285 | if (!(flags & SHOW_MEM_FILTER_NODES)) |
9af744d7 | 5286 | return false; |
ddd588b5 | 5287 | |
9af744d7 MH |
5288 | /* |
5289 | * no node mask - aka implicit memory numa policy. Do not bother with | |
5290 | * the synchronization - read_mems_allowed_begin - because we do not | |
5291 | * have to be precise here. | |
5292 | */ | |
5293 | if (!nodemask) | |
5294 | nodemask = &cpuset_current_mems_allowed; | |
5295 | ||
5296 | return !node_isset(nid, *nodemask); | |
ddd588b5 DR |
5297 | } |
5298 | ||
1da177e4 LT |
5299 | #define K(x) ((x) << (PAGE_SHIFT-10)) |
5300 | ||
377e4f16 RV |
5301 | static void show_migration_types(unsigned char type) |
5302 | { | |
5303 | static const char types[MIGRATE_TYPES] = { | |
5304 | [MIGRATE_UNMOVABLE] = 'U', | |
377e4f16 | 5305 | [MIGRATE_MOVABLE] = 'M', |
475a2f90 VB |
5306 | [MIGRATE_RECLAIMABLE] = 'E', |
5307 | [MIGRATE_HIGHATOMIC] = 'H', | |
377e4f16 RV |
5308 | #ifdef CONFIG_CMA |
5309 | [MIGRATE_CMA] = 'C', | |
5310 | #endif | |
194159fb | 5311 | #ifdef CONFIG_MEMORY_ISOLATION |
377e4f16 | 5312 | [MIGRATE_ISOLATE] = 'I', |
194159fb | 5313 | #endif |
377e4f16 RV |
5314 | }; |
5315 | char tmp[MIGRATE_TYPES + 1]; | |
5316 | char *p = tmp; | |
5317 | int i; | |
5318 | ||
5319 | for (i = 0; i < MIGRATE_TYPES; i++) { | |
5320 | if (type & (1 << i)) | |
5321 | *p++ = types[i]; | |
5322 | } | |
5323 | ||
5324 | *p = '\0'; | |
1f84a18f | 5325 | printk(KERN_CONT "(%s) ", tmp); |
377e4f16 RV |
5326 | } |
5327 | ||
1da177e4 LT |
5328 | /* |
5329 | * Show free area list (used inside shift_scroll-lock stuff) | |
5330 | * We also calculate the percentage fragmentation. We do this by counting the | |
5331 | * memory on each free list with the exception of the first item on the list. | |
d1bfcdb8 KK |
5332 | * |
5333 | * Bits in @filter: | |
5334 | * SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's | |
5335 | * cpuset. | |
1da177e4 | 5336 | */ |
9af744d7 | 5337 | void show_free_areas(unsigned int filter, nodemask_t *nodemask) |
1da177e4 | 5338 | { |
d1bfcdb8 | 5339 | unsigned long free_pcp = 0; |
c7241913 | 5340 | int cpu; |
1da177e4 | 5341 | struct zone *zone; |
599d0c95 | 5342 | pg_data_t *pgdat; |
1da177e4 | 5343 | |
ee99c71c | 5344 | for_each_populated_zone(zone) { |
9af744d7 | 5345 | if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask)) |
ddd588b5 | 5346 | continue; |
d1bfcdb8 | 5347 | |
761b0677 KK |
5348 | for_each_online_cpu(cpu) |
5349 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; | |
1da177e4 LT |
5350 | } |
5351 | ||
a731286d KM |
5352 | printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n" |
5353 | " active_file:%lu inactive_file:%lu isolated_file:%lu\n" | |
8d92890b | 5354 | " unevictable:%lu dirty:%lu writeback:%lu\n" |
d1bfcdb8 | 5355 | " slab_reclaimable:%lu slab_unreclaimable:%lu\n" |
d1ce749a | 5356 | " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n" |
d1bfcdb8 | 5357 | " free:%lu free_pcp:%lu free_cma:%lu\n", |
599d0c95 MG |
5358 | global_node_page_state(NR_ACTIVE_ANON), |
5359 | global_node_page_state(NR_INACTIVE_ANON), | |
5360 | global_node_page_state(NR_ISOLATED_ANON), | |
5361 | global_node_page_state(NR_ACTIVE_FILE), | |
5362 | global_node_page_state(NR_INACTIVE_FILE), | |
5363 | global_node_page_state(NR_ISOLATED_FILE), | |
5364 | global_node_page_state(NR_UNEVICTABLE), | |
11fb9989 MG |
5365 | global_node_page_state(NR_FILE_DIRTY), |
5366 | global_node_page_state(NR_WRITEBACK), | |
d42f3245 RG |
5367 | global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B), |
5368 | global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B), | |
50658e2e | 5369 | global_node_page_state(NR_FILE_MAPPED), |
11fb9989 | 5370 | global_node_page_state(NR_SHMEM), |
c41f012a MH |
5371 | global_zone_page_state(NR_PAGETABLE), |
5372 | global_zone_page_state(NR_BOUNCE), | |
5373 | global_zone_page_state(NR_FREE_PAGES), | |
d1bfcdb8 | 5374 | free_pcp, |
c41f012a | 5375 | global_zone_page_state(NR_FREE_CMA_PAGES)); |
1da177e4 | 5376 | |
599d0c95 | 5377 | for_each_online_pgdat(pgdat) { |
9af744d7 | 5378 | if (show_mem_node_skip(filter, pgdat->node_id, nodemask)) |
c02e50bb MH |
5379 | continue; |
5380 | ||
599d0c95 MG |
5381 | printk("Node %d" |
5382 | " active_anon:%lukB" | |
5383 | " inactive_anon:%lukB" | |
5384 | " active_file:%lukB" | |
5385 | " inactive_file:%lukB" | |
5386 | " unevictable:%lukB" | |
5387 | " isolated(anon):%lukB" | |
5388 | " isolated(file):%lukB" | |
50658e2e | 5389 | " mapped:%lukB" |
11fb9989 MG |
5390 | " dirty:%lukB" |
5391 | " writeback:%lukB" | |
5392 | " shmem:%lukB" | |
5393 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
5394 | " shmem_thp: %lukB" | |
5395 | " shmem_pmdmapped: %lukB" | |
5396 | " anon_thp: %lukB" | |
5397 | #endif | |
5398 | " writeback_tmp:%lukB" | |
991e7673 SB |
5399 | " kernel_stack:%lukB" |
5400 | #ifdef CONFIG_SHADOW_CALL_STACK | |
5401 | " shadow_call_stack:%lukB" | |
5402 | #endif | |
599d0c95 MG |
5403 | " all_unreclaimable? %s" |
5404 | "\n", | |
5405 | pgdat->node_id, | |
5406 | K(node_page_state(pgdat, NR_ACTIVE_ANON)), | |
5407 | K(node_page_state(pgdat, NR_INACTIVE_ANON)), | |
5408 | K(node_page_state(pgdat, NR_ACTIVE_FILE)), | |
5409 | K(node_page_state(pgdat, NR_INACTIVE_FILE)), | |
5410 | K(node_page_state(pgdat, NR_UNEVICTABLE)), | |
5411 | K(node_page_state(pgdat, NR_ISOLATED_ANON)), | |
5412 | K(node_page_state(pgdat, NR_ISOLATED_FILE)), | |
50658e2e | 5413 | K(node_page_state(pgdat, NR_FILE_MAPPED)), |
11fb9989 MG |
5414 | K(node_page_state(pgdat, NR_FILE_DIRTY)), |
5415 | K(node_page_state(pgdat, NR_WRITEBACK)), | |
1f06b81a | 5416 | K(node_page_state(pgdat, NR_SHMEM)), |
11fb9989 MG |
5417 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
5418 | K(node_page_state(pgdat, NR_SHMEM_THPS) * HPAGE_PMD_NR), | |
5419 | K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) | |
5420 | * HPAGE_PMD_NR), | |
5421 | K(node_page_state(pgdat, NR_ANON_THPS) * HPAGE_PMD_NR), | |
5422 | #endif | |
11fb9989 | 5423 | K(node_page_state(pgdat, NR_WRITEBACK_TEMP)), |
991e7673 SB |
5424 | node_page_state(pgdat, NR_KERNEL_STACK_KB), |
5425 | #ifdef CONFIG_SHADOW_CALL_STACK | |
5426 | node_page_state(pgdat, NR_KERNEL_SCS_KB), | |
5427 | #endif | |
c73322d0 JW |
5428 | pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES ? |
5429 | "yes" : "no"); | |
599d0c95 MG |
5430 | } |
5431 | ||
ee99c71c | 5432 | for_each_populated_zone(zone) { |
1da177e4 LT |
5433 | int i; |
5434 | ||
9af744d7 | 5435 | if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask)) |
ddd588b5 | 5436 | continue; |
d1bfcdb8 KK |
5437 | |
5438 | free_pcp = 0; | |
5439 | for_each_online_cpu(cpu) | |
5440 | free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count; | |
5441 | ||
1da177e4 | 5442 | show_node(zone); |
1f84a18f JP |
5443 | printk(KERN_CONT |
5444 | "%s" | |
1da177e4 LT |
5445 | " free:%lukB" |
5446 | " min:%lukB" | |
5447 | " low:%lukB" | |
5448 | " high:%lukB" | |
e47b346a | 5449 | " reserved_highatomic:%luKB" |
71c799f4 MK |
5450 | " active_anon:%lukB" |
5451 | " inactive_anon:%lukB" | |
5452 | " active_file:%lukB" | |
5453 | " inactive_file:%lukB" | |
5454 | " unevictable:%lukB" | |
5a1c84b4 | 5455 | " writepending:%lukB" |
1da177e4 | 5456 | " present:%lukB" |
9feedc9d | 5457 | " managed:%lukB" |
4a0aa73f | 5458 | " mlocked:%lukB" |
4a0aa73f | 5459 | " pagetables:%lukB" |
4a0aa73f | 5460 | " bounce:%lukB" |
d1bfcdb8 KK |
5461 | " free_pcp:%lukB" |
5462 | " local_pcp:%ukB" | |
d1ce749a | 5463 | " free_cma:%lukB" |
1da177e4 LT |
5464 | "\n", |
5465 | zone->name, | |
88f5acf8 | 5466 | K(zone_page_state(zone, NR_FREE_PAGES)), |
41858966 MG |
5467 | K(min_wmark_pages(zone)), |
5468 | K(low_wmark_pages(zone)), | |
5469 | K(high_wmark_pages(zone)), | |
e47b346a | 5470 | K(zone->nr_reserved_highatomic), |
71c799f4 MK |
5471 | K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON)), |
5472 | K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON)), | |
5473 | K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE)), | |
5474 | K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE)), | |
5475 | K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)), | |
5a1c84b4 | 5476 | K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)), |
1da177e4 | 5477 | K(zone->present_pages), |
9705bea5 | 5478 | K(zone_managed_pages(zone)), |
4a0aa73f | 5479 | K(zone_page_state(zone, NR_MLOCK)), |
4a0aa73f | 5480 | K(zone_page_state(zone, NR_PAGETABLE)), |
4a0aa73f | 5481 | K(zone_page_state(zone, NR_BOUNCE)), |
d1bfcdb8 KK |
5482 | K(free_pcp), |
5483 | K(this_cpu_read(zone->pageset->pcp.count)), | |
33e077bd | 5484 | K(zone_page_state(zone, NR_FREE_CMA_PAGES))); |
1da177e4 LT |
5485 | printk("lowmem_reserve[]:"); |
5486 | for (i = 0; i < MAX_NR_ZONES; i++) | |
1f84a18f JP |
5487 | printk(KERN_CONT " %ld", zone->lowmem_reserve[i]); |
5488 | printk(KERN_CONT "\n"); | |
1da177e4 LT |
5489 | } |
5490 | ||
ee99c71c | 5491 | for_each_populated_zone(zone) { |
d00181b9 KS |
5492 | unsigned int order; |
5493 | unsigned long nr[MAX_ORDER], flags, total = 0; | |
377e4f16 | 5494 | unsigned char types[MAX_ORDER]; |
1da177e4 | 5495 | |
9af744d7 | 5496 | if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask)) |
ddd588b5 | 5497 | continue; |
1da177e4 | 5498 | show_node(zone); |
1f84a18f | 5499 | printk(KERN_CONT "%s: ", zone->name); |
1da177e4 LT |
5500 | |
5501 | spin_lock_irqsave(&zone->lock, flags); | |
5502 | for (order = 0; order < MAX_ORDER; order++) { | |
377e4f16 RV |
5503 | struct free_area *area = &zone->free_area[order]; |
5504 | int type; | |
5505 | ||
5506 | nr[order] = area->nr_free; | |
8f9de51a | 5507 | total += nr[order] << order; |
377e4f16 RV |
5508 | |
5509 | types[order] = 0; | |
5510 | for (type = 0; type < MIGRATE_TYPES; type++) { | |
b03641af | 5511 | if (!free_area_empty(area, type)) |
377e4f16 RV |
5512 | types[order] |= 1 << type; |
5513 | } | |
1da177e4 LT |
5514 | } |
5515 | spin_unlock_irqrestore(&zone->lock, flags); | |
377e4f16 | 5516 | for (order = 0; order < MAX_ORDER; order++) { |
1f84a18f JP |
5517 | printk(KERN_CONT "%lu*%lukB ", |
5518 | nr[order], K(1UL) << order); | |
377e4f16 RV |
5519 | if (nr[order]) |
5520 | show_migration_types(types[order]); | |
5521 | } | |
1f84a18f | 5522 | printk(KERN_CONT "= %lukB\n", K(total)); |
1da177e4 LT |
5523 | } |
5524 | ||
949f7ec5 DR |
5525 | hugetlb_show_meminfo(); |
5526 | ||
11fb9989 | 5527 | printk("%ld total pagecache pages\n", global_node_page_state(NR_FILE_PAGES)); |
e6f3602d | 5528 | |
1da177e4 LT |
5529 | show_swap_cache_info(); |
5530 | } | |
5531 | ||
19770b32 MG |
5532 | static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) |
5533 | { | |
5534 | zoneref->zone = zone; | |
5535 | zoneref->zone_idx = zone_idx(zone); | |
5536 | } | |
5537 | ||
1da177e4 LT |
5538 | /* |
5539 | * Builds allocation fallback zone lists. | |
1a93205b CL |
5540 | * |
5541 | * Add all populated zones of a node to the zonelist. | |
1da177e4 | 5542 | */ |
9d3be21b | 5543 | static int build_zonerefs_node(pg_data_t *pgdat, struct zoneref *zonerefs) |
1da177e4 | 5544 | { |
1a93205b | 5545 | struct zone *zone; |
bc732f1d | 5546 | enum zone_type zone_type = MAX_NR_ZONES; |
9d3be21b | 5547 | int nr_zones = 0; |
02a68a5e CL |
5548 | |
5549 | do { | |
2f6726e5 | 5550 | zone_type--; |
070f8032 | 5551 | zone = pgdat->node_zones + zone_type; |
6aa303de | 5552 | if (managed_zone(zone)) { |
9d3be21b | 5553 | zoneref_set_zone(zone, &zonerefs[nr_zones++]); |
070f8032 | 5554 | check_highest_zone(zone_type); |
1da177e4 | 5555 | } |
2f6726e5 | 5556 | } while (zone_type); |
bc732f1d | 5557 | |
070f8032 | 5558 | return nr_zones; |
1da177e4 LT |
5559 | } |
5560 | ||
5561 | #ifdef CONFIG_NUMA | |
f0c0b2b8 KH |
5562 | |
5563 | static int __parse_numa_zonelist_order(char *s) | |
5564 | { | |
c9bff3ee MH |
5565 | /* |
5566 | * We used to support different zonlists modes but they turned | |
5567 | * out to be just not useful. Let's keep the warning in place | |
5568 | * if somebody still use the cmd line parameter so that we do | |
5569 | * not fail it silently | |
5570 | */ | |
5571 | if (!(*s == 'd' || *s == 'D' || *s == 'n' || *s == 'N')) { | |
5572 | pr_warn("Ignoring unsupported numa_zonelist_order value: %s\n", s); | |
f0c0b2b8 KH |
5573 | return -EINVAL; |
5574 | } | |
5575 | return 0; | |
5576 | } | |
5577 | ||
c9bff3ee MH |
5578 | char numa_zonelist_order[] = "Node"; |
5579 | ||
f0c0b2b8 KH |
5580 | /* |
5581 | * sysctl handler for numa_zonelist_order | |
5582 | */ | |
cccad5b9 | 5583 | int numa_zonelist_order_handler(struct ctl_table *table, int write, |
32927393 | 5584 | void *buffer, size_t *length, loff_t *ppos) |
f0c0b2b8 | 5585 | { |
32927393 CH |
5586 | if (write) |
5587 | return __parse_numa_zonelist_order(buffer); | |
5588 | return proc_dostring(table, write, buffer, length, ppos); | |
f0c0b2b8 KH |
5589 | } |
5590 | ||
5591 | ||
62bc62a8 | 5592 | #define MAX_NODE_LOAD (nr_online_nodes) |
f0c0b2b8 KH |
5593 | static int node_load[MAX_NUMNODES]; |
5594 | ||
1da177e4 | 5595 | /** |
4dc3b16b | 5596 | * find_next_best_node - find the next node that should appear in a given node's fallback list |
1da177e4 LT |
5597 | * @node: node whose fallback list we're appending |
5598 | * @used_node_mask: nodemask_t of already used nodes | |
5599 | * | |
5600 | * We use a number of factors to determine which is the next node that should | |
5601 | * appear on a given node's fallback list. The node should not have appeared | |
5602 | * already in @node's fallback list, and it should be the next closest node | |
5603 | * according to the distance array (which contains arbitrary distance values | |
5604 | * from each node to each node in the system), and should also prefer nodes | |
5605 | * with no CPUs, since presumably they'll have very little allocation pressure | |
5606 | * on them otherwise. | |
a862f68a MR |
5607 | * |
5608 | * Return: node id of the found node or %NUMA_NO_NODE if no node is found. | |
1da177e4 | 5609 | */ |
f0c0b2b8 | 5610 | static int find_next_best_node(int node, nodemask_t *used_node_mask) |
1da177e4 | 5611 | { |
4cf808eb | 5612 | int n, val; |
1da177e4 | 5613 | int min_val = INT_MAX; |
00ef2d2f | 5614 | int best_node = NUMA_NO_NODE; |
a70f7302 | 5615 | const struct cpumask *tmp = cpumask_of_node(0); |
1da177e4 | 5616 | |
4cf808eb LT |
5617 | /* Use the local node if we haven't already */ |
5618 | if (!node_isset(node, *used_node_mask)) { | |
5619 | node_set(node, *used_node_mask); | |
5620 | return node; | |
5621 | } | |
1da177e4 | 5622 | |
4b0ef1fe | 5623 | for_each_node_state(n, N_MEMORY) { |
1da177e4 LT |
5624 | |
5625 | /* Don't want a node to appear more than once */ | |
5626 | if (node_isset(n, *used_node_mask)) | |
5627 | continue; | |
5628 | ||
1da177e4 LT |
5629 | /* Use the distance array to find the distance */ |
5630 | val = node_distance(node, n); | |
5631 | ||
4cf808eb LT |
5632 | /* Penalize nodes under us ("prefer the next node") */ |
5633 | val += (n < node); | |
5634 | ||
1da177e4 | 5635 | /* Give preference to headless and unused nodes */ |
a70f7302 RR |
5636 | tmp = cpumask_of_node(n); |
5637 | if (!cpumask_empty(tmp)) | |
1da177e4 LT |
5638 | val += PENALTY_FOR_NODE_WITH_CPUS; |
5639 | ||
5640 | /* Slight preference for less loaded node */ | |
5641 | val *= (MAX_NODE_LOAD*MAX_NUMNODES); | |
5642 | val += node_load[n]; | |
5643 | ||
5644 | if (val < min_val) { | |
5645 | min_val = val; | |
5646 | best_node = n; | |
5647 | } | |
5648 | } | |
5649 | ||
5650 | if (best_node >= 0) | |
5651 | node_set(best_node, *used_node_mask); | |
5652 | ||
5653 | return best_node; | |
5654 | } | |
5655 | ||
f0c0b2b8 KH |
5656 | |
5657 | /* | |
5658 | * Build zonelists ordered by node and zones within node. | |
5659 | * This results in maximum locality--normal zone overflows into local | |
5660 | * DMA zone, if any--but risks exhausting DMA zone. | |
5661 | */ | |
9d3be21b MH |
5662 | static void build_zonelists_in_node_order(pg_data_t *pgdat, int *node_order, |
5663 | unsigned nr_nodes) | |
1da177e4 | 5664 | { |
9d3be21b MH |
5665 | struct zoneref *zonerefs; |
5666 | int i; | |
5667 | ||
5668 | zonerefs = pgdat->node_zonelists[ZONELIST_FALLBACK]._zonerefs; | |
5669 | ||
5670 | for (i = 0; i < nr_nodes; i++) { | |
5671 | int nr_zones; | |
5672 | ||
5673 | pg_data_t *node = NODE_DATA(node_order[i]); | |
f0c0b2b8 | 5674 | |
9d3be21b MH |
5675 | nr_zones = build_zonerefs_node(node, zonerefs); |
5676 | zonerefs += nr_zones; | |
5677 | } | |
5678 | zonerefs->zone = NULL; | |
5679 | zonerefs->zone_idx = 0; | |
f0c0b2b8 KH |
5680 | } |
5681 | ||
523b9458 CL |
5682 | /* |
5683 | * Build gfp_thisnode zonelists | |
5684 | */ | |
5685 | static void build_thisnode_zonelists(pg_data_t *pgdat) | |
5686 | { | |
9d3be21b MH |
5687 | struct zoneref *zonerefs; |
5688 | int nr_zones; | |
523b9458 | 5689 | |
9d3be21b MH |
5690 | zonerefs = pgdat->node_zonelists[ZONELIST_NOFALLBACK]._zonerefs; |
5691 | nr_zones = build_zonerefs_node(pgdat, zonerefs); | |
5692 | zonerefs += nr_zones; | |
5693 | zonerefs->zone = NULL; | |
5694 | zonerefs->zone_idx = 0; | |
523b9458 CL |
5695 | } |
5696 | ||
f0c0b2b8 KH |
5697 | /* |
5698 | * Build zonelists ordered by zone and nodes within zones. | |
5699 | * This results in conserving DMA zone[s] until all Normal memory is | |
5700 | * exhausted, but results in overflowing to remote node while memory | |
5701 | * may still exist in local DMA zone. | |
5702 | */ | |
f0c0b2b8 | 5703 | |
f0c0b2b8 KH |
5704 | static void build_zonelists(pg_data_t *pgdat) |
5705 | { | |
9d3be21b MH |
5706 | static int node_order[MAX_NUMNODES]; |
5707 | int node, load, nr_nodes = 0; | |
d0ddf49b | 5708 | nodemask_t used_mask = NODE_MASK_NONE; |
f0c0b2b8 | 5709 | int local_node, prev_node; |
1da177e4 LT |
5710 | |
5711 | /* NUMA-aware ordering of nodes */ | |
5712 | local_node = pgdat->node_id; | |
62bc62a8 | 5713 | load = nr_online_nodes; |
1da177e4 | 5714 | prev_node = local_node; |
f0c0b2b8 | 5715 | |
f0c0b2b8 | 5716 | memset(node_order, 0, sizeof(node_order)); |
1da177e4 LT |
5717 | while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { |
5718 | /* | |
5719 | * We don't want to pressure a particular node. | |
5720 | * So adding penalty to the first node in same | |
5721 | * distance group to make it round-robin. | |
5722 | */ | |
957f822a DR |
5723 | if (node_distance(local_node, node) != |
5724 | node_distance(local_node, prev_node)) | |
f0c0b2b8 KH |
5725 | node_load[node] = load; |
5726 | ||
9d3be21b | 5727 | node_order[nr_nodes++] = node; |
1da177e4 LT |
5728 | prev_node = node; |
5729 | load--; | |
1da177e4 | 5730 | } |
523b9458 | 5731 | |
9d3be21b | 5732 | build_zonelists_in_node_order(pgdat, node_order, nr_nodes); |
523b9458 | 5733 | build_thisnode_zonelists(pgdat); |
1da177e4 LT |
5734 | } |
5735 | ||
7aac7898 LS |
5736 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
5737 | /* | |
5738 | * Return node id of node used for "local" allocations. | |
5739 | * I.e., first node id of first zone in arg node's generic zonelist. | |
5740 | * Used for initializing percpu 'numa_mem', which is used primarily | |
5741 | * for kernel allocations, so use GFP_KERNEL flags to locate zonelist. | |
5742 | */ | |
5743 | int local_memory_node(int node) | |
5744 | { | |
c33d6c06 | 5745 | struct zoneref *z; |
7aac7898 | 5746 | |
c33d6c06 | 5747 | z = first_zones_zonelist(node_zonelist(node, GFP_KERNEL), |
7aac7898 | 5748 | gfp_zone(GFP_KERNEL), |
c33d6c06 | 5749 | NULL); |
c1093b74 | 5750 | return zone_to_nid(z->zone); |
7aac7898 LS |
5751 | } |
5752 | #endif | |
f0c0b2b8 | 5753 | |
6423aa81 JK |
5754 | static void setup_min_unmapped_ratio(void); |
5755 | static void setup_min_slab_ratio(void); | |
1da177e4 LT |
5756 | #else /* CONFIG_NUMA */ |
5757 | ||
f0c0b2b8 | 5758 | static void build_zonelists(pg_data_t *pgdat) |
1da177e4 | 5759 | { |
19655d34 | 5760 | int node, local_node; |
9d3be21b MH |
5761 | struct zoneref *zonerefs; |
5762 | int nr_zones; | |
1da177e4 LT |
5763 | |
5764 | local_node = pgdat->node_id; | |
1da177e4 | 5765 | |
9d3be21b MH |
5766 | zonerefs = pgdat->node_zonelists[ZONELIST_FALLBACK]._zonerefs; |
5767 | nr_zones = build_zonerefs_node(pgdat, zonerefs); | |
5768 | zonerefs += nr_zones; | |
1da177e4 | 5769 | |
54a6eb5c MG |
5770 | /* |
5771 | * Now we build the zonelist so that it contains the zones | |
5772 | * of all the other nodes. | |
5773 | * We don't want to pressure a particular node, so when | |
5774 | * building the zones for node N, we make sure that the | |
5775 | * zones coming right after the local ones are those from | |
5776 | * node N+1 (modulo N) | |
5777 | */ | |
5778 | for (node = local_node + 1; node < MAX_NUMNODES; node++) { | |
5779 | if (!node_online(node)) | |
5780 | continue; | |
9d3be21b MH |
5781 | nr_zones = build_zonerefs_node(NODE_DATA(node), zonerefs); |
5782 | zonerefs += nr_zones; | |
1da177e4 | 5783 | } |
54a6eb5c MG |
5784 | for (node = 0; node < local_node; node++) { |
5785 | if (!node_online(node)) | |
5786 | continue; | |
9d3be21b MH |
5787 | nr_zones = build_zonerefs_node(NODE_DATA(node), zonerefs); |
5788 | zonerefs += nr_zones; | |
54a6eb5c MG |
5789 | } |
5790 | ||
9d3be21b MH |
5791 | zonerefs->zone = NULL; |
5792 | zonerefs->zone_idx = 0; | |
1da177e4 LT |
5793 | } |
5794 | ||
5795 | #endif /* CONFIG_NUMA */ | |
5796 | ||
99dcc3e5 CL |
5797 | /* |
5798 | * Boot pageset table. One per cpu which is going to be used for all | |
5799 | * zones and all nodes. The parameters will be set in such a way | |
5800 | * that an item put on a list will immediately be handed over to | |
5801 | * the buddy list. This is safe since pageset manipulation is done | |
5802 | * with interrupts disabled. | |
5803 | * | |
5804 | * The boot_pagesets must be kept even after bootup is complete for | |
5805 | * unused processors and/or zones. They do play a role for bootstrapping | |
5806 | * hotplugged processors. | |
5807 | * | |
5808 | * zoneinfo_show() and maybe other functions do | |
5809 | * not check if the processor is online before following the pageset pointer. | |
5810 | * Other parts of the kernel may not check if the zone is available. | |
5811 | */ | |
5812 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch); | |
5813 | static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset); | |
385386cf | 5814 | static DEFINE_PER_CPU(struct per_cpu_nodestat, boot_nodestats); |
99dcc3e5 | 5815 | |
11cd8638 | 5816 | static void __build_all_zonelists(void *data) |
1da177e4 | 5817 | { |
6811378e | 5818 | int nid; |
afb6ebb3 | 5819 | int __maybe_unused cpu; |
9adb62a5 | 5820 | pg_data_t *self = data; |
b93e0f32 MH |
5821 | static DEFINE_SPINLOCK(lock); |
5822 | ||
5823 | spin_lock(&lock); | |
9276b1bc | 5824 | |
7f9cfb31 BL |
5825 | #ifdef CONFIG_NUMA |
5826 | memset(node_load, 0, sizeof(node_load)); | |
5827 | #endif | |
9adb62a5 | 5828 | |
c1152583 WY |
5829 | /* |
5830 | * This node is hotadded and no memory is yet present. So just | |
5831 | * building zonelists is fine - no need to touch other nodes. | |
5832 | */ | |
9adb62a5 JL |
5833 | if (self && !node_online(self->node_id)) { |
5834 | build_zonelists(self); | |
c1152583 WY |
5835 | } else { |
5836 | for_each_online_node(nid) { | |
5837 | pg_data_t *pgdat = NODE_DATA(nid); | |
7ea1530a | 5838 | |
c1152583 WY |
5839 | build_zonelists(pgdat); |
5840 | } | |
99dcc3e5 | 5841 | |
7aac7898 LS |
5842 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
5843 | /* | |
5844 | * We now know the "local memory node" for each node-- | |
5845 | * i.e., the node of the first zone in the generic zonelist. | |
5846 | * Set up numa_mem percpu variable for on-line cpus. During | |
5847 | * boot, only the boot cpu should be on-line; we'll init the | |
5848 | * secondary cpus' numa_mem as they come on-line. During | |
5849 | * node/memory hotplug, we'll fixup all on-line cpus. | |
5850 | */ | |
d9c9a0b9 | 5851 | for_each_online_cpu(cpu) |
7aac7898 | 5852 | set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu))); |
afb6ebb3 | 5853 | #endif |
d9c9a0b9 | 5854 | } |
b93e0f32 MH |
5855 | |
5856 | spin_unlock(&lock); | |
6811378e YG |
5857 | } |
5858 | ||
061f67bc RV |
5859 | static noinline void __init |
5860 | build_all_zonelists_init(void) | |
5861 | { | |
afb6ebb3 MH |
5862 | int cpu; |
5863 | ||
061f67bc | 5864 | __build_all_zonelists(NULL); |
afb6ebb3 MH |
5865 | |
5866 | /* | |
5867 | * Initialize the boot_pagesets that are going to be used | |
5868 | * for bootstrapping processors. The real pagesets for | |
5869 | * each zone will be allocated later when the per cpu | |
5870 | * allocator is available. | |
5871 | * | |
5872 | * boot_pagesets are used also for bootstrapping offline | |
5873 | * cpus if the system is already booted because the pagesets | |
5874 | * are needed to initialize allocators on a specific cpu too. | |
5875 | * F.e. the percpu allocator needs the page allocator which | |
5876 | * needs the percpu allocator in order to allocate its pagesets | |
5877 | * (a chicken-egg dilemma). | |
5878 | */ | |
5879 | for_each_possible_cpu(cpu) | |
5880 | setup_pageset(&per_cpu(boot_pageset, cpu), 0); | |
5881 | ||
061f67bc RV |
5882 | mminit_verify_zonelist(); |
5883 | cpuset_init_current_mems_allowed(); | |
5884 | } | |
5885 | ||
4eaf3f64 | 5886 | /* |
4eaf3f64 | 5887 | * unless system_state == SYSTEM_BOOTING. |
061f67bc | 5888 | * |
72675e13 | 5889 | * __ref due to call of __init annotated helper build_all_zonelists_init |
061f67bc | 5890 | * [protected by SYSTEM_BOOTING]. |
4eaf3f64 | 5891 | */ |
72675e13 | 5892 | void __ref build_all_zonelists(pg_data_t *pgdat) |
6811378e YG |
5893 | { |
5894 | if (system_state == SYSTEM_BOOTING) { | |
061f67bc | 5895 | build_all_zonelists_init(); |
6811378e | 5896 | } else { |
11cd8638 | 5897 | __build_all_zonelists(pgdat); |
6811378e YG |
5898 | /* cpuset refresh routine should be here */ |
5899 | } | |
bd1e22b8 | 5900 | vm_total_pages = nr_free_pagecache_pages(); |
9ef9acb0 MG |
5901 | /* |
5902 | * Disable grouping by mobility if the number of pages in the | |
5903 | * system is too low to allow the mechanism to work. It would be | |
5904 | * more accurate, but expensive to check per-zone. This check is | |
5905 | * made on memory-hotadd so a system can start with mobility | |
5906 | * disabled and enable it later | |
5907 | */ | |
d9c23400 | 5908 | if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES)) |
9ef9acb0 MG |
5909 | page_group_by_mobility_disabled = 1; |
5910 | else | |
5911 | page_group_by_mobility_disabled = 0; | |
5912 | ||
ce0725f7 | 5913 | pr_info("Built %u zonelists, mobility grouping %s. Total pages: %ld\n", |
756a025f | 5914 | nr_online_nodes, |
756a025f JP |
5915 | page_group_by_mobility_disabled ? "off" : "on", |
5916 | vm_total_pages); | |
f0c0b2b8 | 5917 | #ifdef CONFIG_NUMA |
f88dfff5 | 5918 | pr_info("Policy zone: %s\n", zone_names[policy_zone]); |
f0c0b2b8 | 5919 | #endif |
1da177e4 LT |
5920 | } |
5921 | ||
a9a9e77f PT |
5922 | /* If zone is ZONE_MOVABLE but memory is mirrored, it is an overlapped init */ |
5923 | static bool __meminit | |
5924 | overlap_memmap_init(unsigned long zone, unsigned long *pfn) | |
5925 | { | |
a9a9e77f PT |
5926 | static struct memblock_region *r; |
5927 | ||
5928 | if (mirrored_kernelcore && zone == ZONE_MOVABLE) { | |
5929 | if (!r || *pfn >= memblock_region_memory_end_pfn(r)) { | |
5930 | for_each_memblock(memory, r) { | |
5931 | if (*pfn < memblock_region_memory_end_pfn(r)) | |
5932 | break; | |
5933 | } | |
5934 | } | |
5935 | if (*pfn >= memblock_region_memory_base_pfn(r) && | |
5936 | memblock_is_mirror(r)) { | |
5937 | *pfn = memblock_region_memory_end_pfn(r); | |
5938 | return true; | |
5939 | } | |
5940 | } | |
a9a9e77f PT |
5941 | return false; |
5942 | } | |
5943 | ||
1da177e4 LT |
5944 | /* |
5945 | * Initially all pages are reserved - free ones are freed | |
c6ffc5ca | 5946 | * up by memblock_free_all() once the early boot process is |
1da177e4 LT |
5947 | * done. Non-atomic initialization, single-pass. |
5948 | */ | |
c09b4240 | 5949 | void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, |
a99583e7 CH |
5950 | unsigned long start_pfn, enum memmap_context context, |
5951 | struct vmem_altmap *altmap) | |
1da177e4 | 5952 | { |
a9a9e77f | 5953 | unsigned long pfn, end_pfn = start_pfn + size; |
d0dc12e8 | 5954 | struct page *page; |
1da177e4 | 5955 | |
22b31eec HD |
5956 | if (highest_memmap_pfn < end_pfn - 1) |
5957 | highest_memmap_pfn = end_pfn - 1; | |
5958 | ||
966cf44f | 5959 | #ifdef CONFIG_ZONE_DEVICE |
4b94ffdc DW |
5960 | /* |
5961 | * Honor reservation requested by the driver for this ZONE_DEVICE | |
966cf44f AD |
5962 | * memory. We limit the total number of pages to initialize to just |
5963 | * those that might contain the memory mapping. We will defer the | |
5964 | * ZONE_DEVICE page initialization until after we have released | |
5965 | * the hotplug lock. | |
4b94ffdc | 5966 | */ |
966cf44f AD |
5967 | if (zone == ZONE_DEVICE) { |
5968 | if (!altmap) | |
5969 | return; | |
5970 | ||
5971 | if (start_pfn == altmap->base_pfn) | |
5972 | start_pfn += altmap->reserve; | |
5973 | end_pfn = altmap->base_pfn + vmem_altmap_offset(altmap); | |
5974 | } | |
5975 | #endif | |
4b94ffdc | 5976 | |
948c436e | 5977 | for (pfn = start_pfn; pfn < end_pfn; ) { |
a2f3aa02 | 5978 | /* |
b72d0ffb AM |
5979 | * There can be holes in boot-time mem_map[]s handed to this |
5980 | * function. They do not exist on hotplugged memory. | |
a2f3aa02 | 5981 | */ |
a9a9e77f | 5982 | if (context == MEMMAP_EARLY) { |
a9a9e77f PT |
5983 | if (overlap_memmap_init(zone, &pfn)) |
5984 | continue; | |
5985 | if (defer_init(nid, pfn, end_pfn)) | |
5986 | break; | |
a2f3aa02 | 5987 | } |
ac5d2539 | 5988 | |
d0dc12e8 PT |
5989 | page = pfn_to_page(pfn); |
5990 | __init_single_page(page, pfn, zone, nid); | |
5991 | if (context == MEMMAP_HOTPLUG) | |
d483da5b | 5992 | __SetPageReserved(page); |
d0dc12e8 | 5993 | |
ac5d2539 MG |
5994 | /* |
5995 | * Mark the block movable so that blocks are reserved for | |
5996 | * movable at startup. This will force kernel allocations | |
5997 | * to reserve their blocks rather than leaking throughout | |
5998 | * the address space during boot when many long-lived | |
974a786e | 5999 | * kernel allocations are made. |
ac5d2539 MG |
6000 | * |
6001 | * bitmap is created for zone's valid pfn range. but memmap | |
6002 | * can be created for invalid pages (for alignment) | |
6003 | * check here not to call set_pageblock_migratetype() against | |
6004 | * pfn out of zone. | |
6005 | */ | |
6006 | if (!(pfn & (pageblock_nr_pages - 1))) { | |
ac5d2539 | 6007 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
9b6e63cb | 6008 | cond_resched(); |
ac5d2539 | 6009 | } |
948c436e | 6010 | pfn++; |
1da177e4 LT |
6011 | } |
6012 | } | |
6013 | ||
966cf44f AD |
6014 | #ifdef CONFIG_ZONE_DEVICE |
6015 | void __ref memmap_init_zone_device(struct zone *zone, | |
6016 | unsigned long start_pfn, | |
1f8d75c1 | 6017 | unsigned long nr_pages, |
966cf44f AD |
6018 | struct dev_pagemap *pgmap) |
6019 | { | |
1f8d75c1 | 6020 | unsigned long pfn, end_pfn = start_pfn + nr_pages; |
966cf44f | 6021 | struct pglist_data *pgdat = zone->zone_pgdat; |
514caf23 | 6022 | struct vmem_altmap *altmap = pgmap_altmap(pgmap); |
966cf44f AD |
6023 | unsigned long zone_idx = zone_idx(zone); |
6024 | unsigned long start = jiffies; | |
6025 | int nid = pgdat->node_id; | |
6026 | ||
46d945ae | 6027 | if (WARN_ON_ONCE(!pgmap || zone_idx(zone) != ZONE_DEVICE)) |
966cf44f AD |
6028 | return; |
6029 | ||
6030 | /* | |
6031 | * The call to memmap_init_zone should have already taken care | |
6032 | * of the pages reserved for the memmap, so we can just jump to | |
6033 | * the end of that region and start processing the device pages. | |
6034 | */ | |
514caf23 | 6035 | if (altmap) { |
966cf44f | 6036 | start_pfn = altmap->base_pfn + vmem_altmap_offset(altmap); |
1f8d75c1 | 6037 | nr_pages = end_pfn - start_pfn; |
966cf44f AD |
6038 | } |
6039 | ||
6040 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { | |
6041 | struct page *page = pfn_to_page(pfn); | |
6042 | ||
6043 | __init_single_page(page, pfn, zone_idx, nid); | |
6044 | ||
6045 | /* | |
6046 | * Mark page reserved as it will need to wait for onlining | |
6047 | * phase for it to be fully associated with a zone. | |
6048 | * | |
6049 | * We can use the non-atomic __set_bit operation for setting | |
6050 | * the flag as we are still initializing the pages. | |
6051 | */ | |
6052 | __SetPageReserved(page); | |
6053 | ||
6054 | /* | |
8a164fef CH |
6055 | * ZONE_DEVICE pages union ->lru with a ->pgmap back pointer |
6056 | * and zone_device_data. It is a bug if a ZONE_DEVICE page is | |
6057 | * ever freed or placed on a driver-private list. | |
966cf44f AD |
6058 | */ |
6059 | page->pgmap = pgmap; | |
8a164fef | 6060 | page->zone_device_data = NULL; |
966cf44f AD |
6061 | |
6062 | /* | |
6063 | * Mark the block movable so that blocks are reserved for | |
6064 | * movable at startup. This will force kernel allocations | |
6065 | * to reserve their blocks rather than leaking throughout | |
6066 | * the address space during boot when many long-lived | |
6067 | * kernel allocations are made. | |
6068 | * | |
6069 | * bitmap is created for zone's valid pfn range. but memmap | |
6070 | * can be created for invalid pages (for alignment) | |
6071 | * check here not to call set_pageblock_migratetype() against | |
6072 | * pfn out of zone. | |
6073 | * | |
6074 | * Please note that MEMMAP_HOTPLUG path doesn't clear memmap | |
ba72b4c8 | 6075 | * because this is done early in section_activate() |
966cf44f AD |
6076 | */ |
6077 | if (!(pfn & (pageblock_nr_pages - 1))) { | |
6078 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
6079 | cond_resched(); | |
6080 | } | |
6081 | } | |
6082 | ||
fdc029b1 | 6083 | pr_info("%s initialised %lu pages in %ums\n", __func__, |
1f8d75c1 | 6084 | nr_pages, jiffies_to_msecs(jiffies - start)); |
966cf44f AD |
6085 | } |
6086 | ||
6087 | #endif | |
1e548deb | 6088 | static void __meminit zone_init_free_lists(struct zone *zone) |
1da177e4 | 6089 | { |
7aeb09f9 | 6090 | unsigned int order, t; |
b2a0ac88 MG |
6091 | for_each_migratetype_order(order, t) { |
6092 | INIT_LIST_HEAD(&zone->free_area[order].free_list[t]); | |
1da177e4 LT |
6093 | zone->free_area[order].nr_free = 0; |
6094 | } | |
6095 | } | |
6096 | ||
dfb3ccd0 | 6097 | void __meminit __weak memmap_init(unsigned long size, int nid, |
73a6e474 BH |
6098 | unsigned long zone, |
6099 | unsigned long range_start_pfn) | |
dfb3ccd0 | 6100 | { |
73a6e474 BH |
6101 | unsigned long start_pfn, end_pfn; |
6102 | unsigned long range_end_pfn = range_start_pfn + size; | |
6103 | int i; | |
6104 | ||
6105 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { | |
6106 | start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn); | |
6107 | end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn); | |
6108 | ||
6109 | if (end_pfn > start_pfn) { | |
6110 | size = end_pfn - start_pfn; | |
6111 | memmap_init_zone(size, nid, zone, start_pfn, | |
6112 | MEMMAP_EARLY, NULL); | |
6113 | } | |
6114 | } | |
dfb3ccd0 | 6115 | } |
1da177e4 | 6116 | |
7cd2b0a3 | 6117 | static int zone_batchsize(struct zone *zone) |
e7c8d5c9 | 6118 | { |
3a6be87f | 6119 | #ifdef CONFIG_MMU |
e7c8d5c9 CL |
6120 | int batch; |
6121 | ||
6122 | /* | |
6123 | * The per-cpu-pages pools are set to around 1000th of the | |
d8a759b5 | 6124 | * size of the zone. |
e7c8d5c9 | 6125 | */ |
9705bea5 | 6126 | batch = zone_managed_pages(zone) / 1024; |
d8a759b5 AL |
6127 | /* But no more than a meg. */ |
6128 | if (batch * PAGE_SIZE > 1024 * 1024) | |
6129 | batch = (1024 * 1024) / PAGE_SIZE; | |
e7c8d5c9 CL |
6130 | batch /= 4; /* We effectively *= 4 below */ |
6131 | if (batch < 1) | |
6132 | batch = 1; | |
6133 | ||
6134 | /* | |
0ceaacc9 NP |
6135 | * Clamp the batch to a 2^n - 1 value. Having a power |
6136 | * of 2 value was found to be more likely to have | |
6137 | * suboptimal cache aliasing properties in some cases. | |
e7c8d5c9 | 6138 | * |
0ceaacc9 NP |
6139 | * For example if 2 tasks are alternately allocating |
6140 | * batches of pages, one task can end up with a lot | |
6141 | * of pages of one half of the possible page colors | |
6142 | * and the other with pages of the other colors. | |
e7c8d5c9 | 6143 | */ |
9155203a | 6144 | batch = rounddown_pow_of_two(batch + batch/2) - 1; |
ba56e91c | 6145 | |
e7c8d5c9 | 6146 | return batch; |
3a6be87f DH |
6147 | |
6148 | #else | |
6149 | /* The deferral and batching of frees should be suppressed under NOMMU | |
6150 | * conditions. | |
6151 | * | |
6152 | * The problem is that NOMMU needs to be able to allocate large chunks | |
6153 | * of contiguous memory as there's no hardware page translation to | |
6154 | * assemble apparent contiguous memory from discontiguous pages. | |
6155 | * | |
6156 | * Queueing large contiguous runs of pages for batching, however, | |
6157 | * causes the pages to actually be freed in smaller chunks. As there | |
6158 | * can be a significant delay between the individual batches being | |
6159 | * recycled, this leads to the once large chunks of space being | |
6160 | * fragmented and becoming unavailable for high-order allocations. | |
6161 | */ | |
6162 | return 0; | |
6163 | #endif | |
e7c8d5c9 CL |
6164 | } |
6165 | ||
8d7a8fa9 CS |
6166 | /* |
6167 | * pcp->high and pcp->batch values are related and dependent on one another: | |
6168 | * ->batch must never be higher then ->high. | |
6169 | * The following function updates them in a safe manner without read side | |
6170 | * locking. | |
6171 | * | |
6172 | * Any new users of pcp->batch and pcp->high should ensure they can cope with | |
6173 | * those fields changing asynchronously (acording the the above rule). | |
6174 | * | |
6175 | * mutex_is_locked(&pcp_batch_high_lock) required when calling this function | |
6176 | * outside of boot time (or some other assurance that no concurrent updaters | |
6177 | * exist). | |
6178 | */ | |
6179 | static void pageset_update(struct per_cpu_pages *pcp, unsigned long high, | |
6180 | unsigned long batch) | |
6181 | { | |
6182 | /* start with a fail safe value for batch */ | |
6183 | pcp->batch = 1; | |
6184 | smp_wmb(); | |
6185 | ||
6186 | /* Update high, then batch, in order */ | |
6187 | pcp->high = high; | |
6188 | smp_wmb(); | |
6189 | ||
6190 | pcp->batch = batch; | |
6191 | } | |
6192 | ||
3664033c | 6193 | /* a companion to pageset_set_high() */ |
4008bab7 CS |
6194 | static void pageset_set_batch(struct per_cpu_pageset *p, unsigned long batch) |
6195 | { | |
8d7a8fa9 | 6196 | pageset_update(&p->pcp, 6 * batch, max(1UL, 1 * batch)); |
4008bab7 CS |
6197 | } |
6198 | ||
88c90dbc | 6199 | static void pageset_init(struct per_cpu_pageset *p) |
2caaad41 CL |
6200 | { |
6201 | struct per_cpu_pages *pcp; | |
5f8dcc21 | 6202 | int migratetype; |
2caaad41 | 6203 | |
1c6fe946 MD |
6204 | memset(p, 0, sizeof(*p)); |
6205 | ||
3dfa5721 | 6206 | pcp = &p->pcp; |
5f8dcc21 MG |
6207 | for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++) |
6208 | INIT_LIST_HEAD(&pcp->lists[migratetype]); | |
2caaad41 CL |
6209 | } |
6210 | ||
88c90dbc CS |
6211 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) |
6212 | { | |
6213 | pageset_init(p); | |
6214 | pageset_set_batch(p, batch); | |
6215 | } | |
6216 | ||
8ad4b1fb | 6217 | /* |
3664033c | 6218 | * pageset_set_high() sets the high water mark for hot per_cpu_pagelist |
8ad4b1fb RS |
6219 | * to the value high for the pageset p. |
6220 | */ | |
3664033c | 6221 | static void pageset_set_high(struct per_cpu_pageset *p, |
8ad4b1fb RS |
6222 | unsigned long high) |
6223 | { | |
8d7a8fa9 CS |
6224 | unsigned long batch = max(1UL, high / 4); |
6225 | if ((high / 4) > (PAGE_SHIFT * 8)) | |
6226 | batch = PAGE_SHIFT * 8; | |
8ad4b1fb | 6227 | |
8d7a8fa9 | 6228 | pageset_update(&p->pcp, high, batch); |
8ad4b1fb RS |
6229 | } |
6230 | ||
7cd2b0a3 DR |
6231 | static void pageset_set_high_and_batch(struct zone *zone, |
6232 | struct per_cpu_pageset *pcp) | |
56cef2b8 | 6233 | { |
56cef2b8 | 6234 | if (percpu_pagelist_fraction) |
3664033c | 6235 | pageset_set_high(pcp, |
9705bea5 | 6236 | (zone_managed_pages(zone) / |
56cef2b8 CS |
6237 | percpu_pagelist_fraction)); |
6238 | else | |
6239 | pageset_set_batch(pcp, zone_batchsize(zone)); | |
6240 | } | |
6241 | ||
169f6c19 CS |
6242 | static void __meminit zone_pageset_init(struct zone *zone, int cpu) |
6243 | { | |
6244 | struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu); | |
6245 | ||
6246 | pageset_init(pcp); | |
6247 | pageset_set_high_and_batch(zone, pcp); | |
6248 | } | |
6249 | ||
72675e13 | 6250 | void __meminit setup_zone_pageset(struct zone *zone) |
319774e2 WF |
6251 | { |
6252 | int cpu; | |
319774e2 | 6253 | zone->pageset = alloc_percpu(struct per_cpu_pageset); |
56cef2b8 CS |
6254 | for_each_possible_cpu(cpu) |
6255 | zone_pageset_init(zone, cpu); | |
319774e2 WF |
6256 | } |
6257 | ||
2caaad41 | 6258 | /* |
99dcc3e5 CL |
6259 | * Allocate per cpu pagesets and initialize them. |
6260 | * Before this call only boot pagesets were available. | |
e7c8d5c9 | 6261 | */ |
99dcc3e5 | 6262 | void __init setup_per_cpu_pageset(void) |
e7c8d5c9 | 6263 | { |
b4911ea2 | 6264 | struct pglist_data *pgdat; |
99dcc3e5 | 6265 | struct zone *zone; |
b418a0f9 | 6266 | int __maybe_unused cpu; |
e7c8d5c9 | 6267 | |
319774e2 WF |
6268 | for_each_populated_zone(zone) |
6269 | setup_zone_pageset(zone); | |
b4911ea2 | 6270 | |
b418a0f9 SD |
6271 | #ifdef CONFIG_NUMA |
6272 | /* | |
6273 | * Unpopulated zones continue using the boot pagesets. | |
6274 | * The numa stats for these pagesets need to be reset. | |
6275 | * Otherwise, they will end up skewing the stats of | |
6276 | * the nodes these zones are associated with. | |
6277 | */ | |
6278 | for_each_possible_cpu(cpu) { | |
6279 | struct per_cpu_pageset *pcp = &per_cpu(boot_pageset, cpu); | |
6280 | memset(pcp->vm_numa_stat_diff, 0, | |
6281 | sizeof(pcp->vm_numa_stat_diff)); | |
6282 | } | |
6283 | #endif | |
6284 | ||
b4911ea2 MG |
6285 | for_each_online_pgdat(pgdat) |
6286 | pgdat->per_cpu_nodestats = | |
6287 | alloc_percpu(struct per_cpu_nodestat); | |
e7c8d5c9 CL |
6288 | } |
6289 | ||
c09b4240 | 6290 | static __meminit void zone_pcp_init(struct zone *zone) |
ed8ece2e | 6291 | { |
99dcc3e5 CL |
6292 | /* |
6293 | * per cpu subsystem is not up at this point. The following code | |
6294 | * relies on the ability of the linker to provide the | |
6295 | * offset of a (static) per cpu variable into the per cpu area. | |
6296 | */ | |
6297 | zone->pageset = &boot_pageset; | |
ed8ece2e | 6298 | |
b38a8725 | 6299 | if (populated_zone(zone)) |
99dcc3e5 CL |
6300 | printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%u\n", |
6301 | zone->name, zone->present_pages, | |
6302 | zone_batchsize(zone)); | |
ed8ece2e DH |
6303 | } |
6304 | ||
dc0bbf3b | 6305 | void __meminit init_currently_empty_zone(struct zone *zone, |
718127cc | 6306 | unsigned long zone_start_pfn, |
b171e409 | 6307 | unsigned long size) |
ed8ece2e DH |
6308 | { |
6309 | struct pglist_data *pgdat = zone->zone_pgdat; | |
8f416836 | 6310 | int zone_idx = zone_idx(zone) + 1; |
9dcb8b68 | 6311 | |
8f416836 WY |
6312 | if (zone_idx > pgdat->nr_zones) |
6313 | pgdat->nr_zones = zone_idx; | |
ed8ece2e | 6314 | |
ed8ece2e DH |
6315 | zone->zone_start_pfn = zone_start_pfn; |
6316 | ||
708614e6 MG |
6317 | mminit_dprintk(MMINIT_TRACE, "memmap_init", |
6318 | "Initialising map node %d zone %lu pfns %lu -> %lu\n", | |
6319 | pgdat->node_id, | |
6320 | (unsigned long)zone_idx(zone), | |
6321 | zone_start_pfn, (zone_start_pfn + size)); | |
6322 | ||
1e548deb | 6323 | zone_init_free_lists(zone); |
9dcb8b68 | 6324 | zone->initialized = 1; |
ed8ece2e DH |
6325 | } |
6326 | ||
c713216d MG |
6327 | /** |
6328 | * sparse_memory_present_with_active_regions - Call memory_present for each active range | |
88ca3b94 | 6329 | * @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used. |
c713216d | 6330 | * |
7d018176 ZZ |
6331 | * If an architecture guarantees that all ranges registered contain no holes and may |
6332 | * be freed, this function may be used instead of calling memory_present() manually. | |
c713216d MG |
6333 | */ |
6334 | void __init sparse_memory_present_with_active_regions(int nid) | |
6335 | { | |
c13291a5 TH |
6336 | unsigned long start_pfn, end_pfn; |
6337 | int i, this_nid; | |
c713216d | 6338 | |
c13291a5 TH |
6339 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) |
6340 | memory_present(this_nid, start_pfn, end_pfn); | |
c713216d MG |
6341 | } |
6342 | ||
6343 | /** | |
6344 | * get_pfn_range_for_nid - Return the start and end page frames for a node | |
88ca3b94 RD |
6345 | * @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned. |
6346 | * @start_pfn: Passed by reference. On return, it will have the node start_pfn. | |
6347 | * @end_pfn: Passed by reference. On return, it will have the node end_pfn. | |
c713216d MG |
6348 | * |
6349 | * It returns the start and end page frame of a node based on information | |
7d018176 | 6350 | * provided by memblock_set_node(). If called for a node |
c713216d | 6351 | * with no available memory, a warning is printed and the start and end |
88ca3b94 | 6352 | * PFNs will be 0. |
c713216d | 6353 | */ |
bbe5d993 | 6354 | void __init get_pfn_range_for_nid(unsigned int nid, |
c713216d MG |
6355 | unsigned long *start_pfn, unsigned long *end_pfn) |
6356 | { | |
c13291a5 | 6357 | unsigned long this_start_pfn, this_end_pfn; |
c713216d | 6358 | int i; |
c13291a5 | 6359 | |
c713216d MG |
6360 | *start_pfn = -1UL; |
6361 | *end_pfn = 0; | |
6362 | ||
c13291a5 TH |
6363 | for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) { |
6364 | *start_pfn = min(*start_pfn, this_start_pfn); | |
6365 | *end_pfn = max(*end_pfn, this_end_pfn); | |
c713216d MG |
6366 | } |
6367 | ||
633c0666 | 6368 | if (*start_pfn == -1UL) |
c713216d | 6369 | *start_pfn = 0; |
c713216d MG |
6370 | } |
6371 | ||
2a1e274a MG |
6372 | /* |
6373 | * This finds a zone that can be used for ZONE_MOVABLE pages. The | |
6374 | * assumption is made that zones within a node are ordered in monotonic | |
6375 | * increasing memory addresses so that the "highest" populated zone is used | |
6376 | */ | |
b69a7288 | 6377 | static void __init find_usable_zone_for_movable(void) |
2a1e274a MG |
6378 | { |
6379 | int zone_index; | |
6380 | for (zone_index = MAX_NR_ZONES - 1; zone_index >= 0; zone_index--) { | |
6381 | if (zone_index == ZONE_MOVABLE) | |
6382 | continue; | |
6383 | ||
6384 | if (arch_zone_highest_possible_pfn[zone_index] > | |
6385 | arch_zone_lowest_possible_pfn[zone_index]) | |
6386 | break; | |
6387 | } | |
6388 | ||
6389 | VM_BUG_ON(zone_index == -1); | |
6390 | movable_zone = zone_index; | |
6391 | } | |
6392 | ||
6393 | /* | |
6394 | * The zone ranges provided by the architecture do not include ZONE_MOVABLE | |
25985edc | 6395 | * because it is sized independent of architecture. Unlike the other zones, |
2a1e274a MG |
6396 | * the starting point for ZONE_MOVABLE is not fixed. It may be different |
6397 | * in each node depending on the size of each node and how evenly kernelcore | |
6398 | * is distributed. This helper function adjusts the zone ranges | |
6399 | * provided by the architecture for a given node by using the end of the | |
6400 | * highest usable zone for ZONE_MOVABLE. This preserves the assumption that | |
6401 | * zones within a node are in order of monotonic increases memory addresses | |
6402 | */ | |
bbe5d993 | 6403 | static void __init adjust_zone_range_for_zone_movable(int nid, |
2a1e274a MG |
6404 | unsigned long zone_type, |
6405 | unsigned long node_start_pfn, | |
6406 | unsigned long node_end_pfn, | |
6407 | unsigned long *zone_start_pfn, | |
6408 | unsigned long *zone_end_pfn) | |
6409 | { | |
6410 | /* Only adjust if ZONE_MOVABLE is on this node */ | |
6411 | if (zone_movable_pfn[nid]) { | |
6412 | /* Size ZONE_MOVABLE */ | |
6413 | if (zone_type == ZONE_MOVABLE) { | |
6414 | *zone_start_pfn = zone_movable_pfn[nid]; | |
6415 | *zone_end_pfn = min(node_end_pfn, | |
6416 | arch_zone_highest_possible_pfn[movable_zone]); | |
6417 | ||
e506b996 XQ |
6418 | /* Adjust for ZONE_MOVABLE starting within this range */ |
6419 | } else if (!mirrored_kernelcore && | |
6420 | *zone_start_pfn < zone_movable_pfn[nid] && | |
6421 | *zone_end_pfn > zone_movable_pfn[nid]) { | |
6422 | *zone_end_pfn = zone_movable_pfn[nid]; | |
6423 | ||
2a1e274a MG |
6424 | /* Check if this whole range is within ZONE_MOVABLE */ |
6425 | } else if (*zone_start_pfn >= zone_movable_pfn[nid]) | |
6426 | *zone_start_pfn = *zone_end_pfn; | |
6427 | } | |
6428 | } | |
6429 | ||
c713216d MG |
6430 | /* |
6431 | * Return the number of pages a zone spans in a node, including holes | |
6432 | * present_pages = zone_spanned_pages_in_node() - zone_absent_pages_in_node() | |
6433 | */ | |
bbe5d993 | 6434 | static unsigned long __init zone_spanned_pages_in_node(int nid, |
c713216d | 6435 | unsigned long zone_type, |
7960aedd ZY |
6436 | unsigned long node_start_pfn, |
6437 | unsigned long node_end_pfn, | |
d91749c1 | 6438 | unsigned long *zone_start_pfn, |
854e8848 | 6439 | unsigned long *zone_end_pfn) |
c713216d | 6440 | { |
299c83dc LF |
6441 | unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type]; |
6442 | unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type]; | |
b5685e92 | 6443 | /* When hotadd a new node from cpu_up(), the node should be empty */ |
f9126ab9 XQ |
6444 | if (!node_start_pfn && !node_end_pfn) |
6445 | return 0; | |
6446 | ||
7960aedd | 6447 | /* Get the start and end of the zone */ |
299c83dc LF |
6448 | *zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high); |
6449 | *zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high); | |
2a1e274a MG |
6450 | adjust_zone_range_for_zone_movable(nid, zone_type, |
6451 | node_start_pfn, node_end_pfn, | |
d91749c1 | 6452 | zone_start_pfn, zone_end_pfn); |
c713216d MG |
6453 | |
6454 | /* Check that this node has pages within the zone's required range */ | |
d91749c1 | 6455 | if (*zone_end_pfn < node_start_pfn || *zone_start_pfn > node_end_pfn) |
c713216d MG |
6456 | return 0; |
6457 | ||
6458 | /* Move the zone boundaries inside the node if necessary */ | |
d91749c1 TI |
6459 | *zone_end_pfn = min(*zone_end_pfn, node_end_pfn); |
6460 | *zone_start_pfn = max(*zone_start_pfn, node_start_pfn); | |
c713216d MG |
6461 | |
6462 | /* Return the spanned pages */ | |
d91749c1 | 6463 | return *zone_end_pfn - *zone_start_pfn; |
c713216d MG |
6464 | } |
6465 | ||
6466 | /* | |
6467 | * Return the number of holes in a range on a node. If nid is MAX_NUMNODES, | |
88ca3b94 | 6468 | * then all holes in the requested range will be accounted for. |
c713216d | 6469 | */ |
bbe5d993 | 6470 | unsigned long __init __absent_pages_in_range(int nid, |
c713216d MG |
6471 | unsigned long range_start_pfn, |
6472 | unsigned long range_end_pfn) | |
6473 | { | |
96e907d1 TH |
6474 | unsigned long nr_absent = range_end_pfn - range_start_pfn; |
6475 | unsigned long start_pfn, end_pfn; | |
6476 | int i; | |
c713216d | 6477 | |
96e907d1 TH |
6478 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
6479 | start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn); | |
6480 | end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn); | |
6481 | nr_absent -= end_pfn - start_pfn; | |
c713216d | 6482 | } |
96e907d1 | 6483 | return nr_absent; |
c713216d MG |
6484 | } |
6485 | ||
6486 | /** | |
6487 | * absent_pages_in_range - Return number of page frames in holes within a range | |
6488 | * @start_pfn: The start PFN to start searching for holes | |
6489 | * @end_pfn: The end PFN to stop searching for holes | |
6490 | * | |
a862f68a | 6491 | * Return: the number of pages frames in memory holes within a range. |
c713216d MG |
6492 | */ |
6493 | unsigned long __init absent_pages_in_range(unsigned long start_pfn, | |
6494 | unsigned long end_pfn) | |
6495 | { | |
6496 | return __absent_pages_in_range(MAX_NUMNODES, start_pfn, end_pfn); | |
6497 | } | |
6498 | ||
6499 | /* Return the number of page frames in holes in a zone on a node */ | |
bbe5d993 | 6500 | static unsigned long __init zone_absent_pages_in_node(int nid, |
c713216d | 6501 | unsigned long zone_type, |
7960aedd | 6502 | unsigned long node_start_pfn, |
854e8848 | 6503 | unsigned long node_end_pfn) |
c713216d | 6504 | { |
96e907d1 TH |
6505 | unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type]; |
6506 | unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type]; | |
9c7cd687 | 6507 | unsigned long zone_start_pfn, zone_end_pfn; |
342332e6 | 6508 | unsigned long nr_absent; |
9c7cd687 | 6509 | |
b5685e92 | 6510 | /* When hotadd a new node from cpu_up(), the node should be empty */ |
f9126ab9 XQ |
6511 | if (!node_start_pfn && !node_end_pfn) |
6512 | return 0; | |
6513 | ||
96e907d1 TH |
6514 | zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high); |
6515 | zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high); | |
9c7cd687 | 6516 | |
2a1e274a MG |
6517 | adjust_zone_range_for_zone_movable(nid, zone_type, |
6518 | node_start_pfn, node_end_pfn, | |
6519 | &zone_start_pfn, &zone_end_pfn); | |
342332e6 TI |
6520 | nr_absent = __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); |
6521 | ||
6522 | /* | |
6523 | * ZONE_MOVABLE handling. | |
6524 | * Treat pages to be ZONE_MOVABLE in ZONE_NORMAL as absent pages | |
6525 | * and vice versa. | |
6526 | */ | |
e506b996 XQ |
6527 | if (mirrored_kernelcore && zone_movable_pfn[nid]) { |
6528 | unsigned long start_pfn, end_pfn; | |
6529 | struct memblock_region *r; | |
6530 | ||
6531 | for_each_memblock(memory, r) { | |
6532 | start_pfn = clamp(memblock_region_memory_base_pfn(r), | |
6533 | zone_start_pfn, zone_end_pfn); | |
6534 | end_pfn = clamp(memblock_region_memory_end_pfn(r), | |
6535 | zone_start_pfn, zone_end_pfn); | |
6536 | ||
6537 | if (zone_type == ZONE_MOVABLE && | |
6538 | memblock_is_mirror(r)) | |
6539 | nr_absent += end_pfn - start_pfn; | |
6540 | ||
6541 | if (zone_type == ZONE_NORMAL && | |
6542 | !memblock_is_mirror(r)) | |
6543 | nr_absent += end_pfn - start_pfn; | |
342332e6 TI |
6544 | } |
6545 | } | |
6546 | ||
6547 | return nr_absent; | |
c713216d | 6548 | } |
0e0b864e | 6549 | |
bbe5d993 | 6550 | static void __init calculate_node_totalpages(struct pglist_data *pgdat, |
7960aedd | 6551 | unsigned long node_start_pfn, |
854e8848 | 6552 | unsigned long node_end_pfn) |
c713216d | 6553 | { |
febd5949 | 6554 | unsigned long realtotalpages = 0, totalpages = 0; |
c713216d MG |
6555 | enum zone_type i; |
6556 | ||
febd5949 GZ |
6557 | for (i = 0; i < MAX_NR_ZONES; i++) { |
6558 | struct zone *zone = pgdat->node_zones + i; | |
d91749c1 | 6559 | unsigned long zone_start_pfn, zone_end_pfn; |
3f08a302 | 6560 | unsigned long spanned, absent; |
febd5949 | 6561 | unsigned long size, real_size; |
c713216d | 6562 | |
854e8848 MR |
6563 | spanned = zone_spanned_pages_in_node(pgdat->node_id, i, |
6564 | node_start_pfn, | |
6565 | node_end_pfn, | |
6566 | &zone_start_pfn, | |
6567 | &zone_end_pfn); | |
6568 | absent = zone_absent_pages_in_node(pgdat->node_id, i, | |
6569 | node_start_pfn, | |
6570 | node_end_pfn); | |
3f08a302 MR |
6571 | |
6572 | size = spanned; | |
6573 | real_size = size - absent; | |
6574 | ||
d91749c1 TI |
6575 | if (size) |
6576 | zone->zone_start_pfn = zone_start_pfn; | |
6577 | else | |
6578 | zone->zone_start_pfn = 0; | |
febd5949 GZ |
6579 | zone->spanned_pages = size; |
6580 | zone->present_pages = real_size; | |
6581 | ||
6582 | totalpages += size; | |
6583 | realtotalpages += real_size; | |
6584 | } | |
6585 | ||
6586 | pgdat->node_spanned_pages = totalpages; | |
c713216d MG |
6587 | pgdat->node_present_pages = realtotalpages; |
6588 | printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, | |
6589 | realtotalpages); | |
6590 | } | |
6591 | ||
835c134e MG |
6592 | #ifndef CONFIG_SPARSEMEM |
6593 | /* | |
6594 | * Calculate the size of the zone->blockflags rounded to an unsigned long | |
d9c23400 MG |
6595 | * Start by making sure zonesize is a multiple of pageblock_order by rounding |
6596 | * up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally | |
835c134e MG |
6597 | * round what is now in bits to nearest long in bits, then return it in |
6598 | * bytes. | |
6599 | */ | |
7c45512d | 6600 | static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned long zonesize) |
835c134e MG |
6601 | { |
6602 | unsigned long usemapsize; | |
6603 | ||
7c45512d | 6604 | zonesize += zone_start_pfn & (pageblock_nr_pages-1); |
d9c23400 MG |
6605 | usemapsize = roundup(zonesize, pageblock_nr_pages); |
6606 | usemapsize = usemapsize >> pageblock_order; | |
835c134e MG |
6607 | usemapsize *= NR_PAGEBLOCK_BITS; |
6608 | usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long)); | |
6609 | ||
6610 | return usemapsize / 8; | |
6611 | } | |
6612 | ||
7cc2a959 | 6613 | static void __ref setup_usemap(struct pglist_data *pgdat, |
7c45512d LT |
6614 | struct zone *zone, |
6615 | unsigned long zone_start_pfn, | |
6616 | unsigned long zonesize) | |
835c134e | 6617 | { |
7c45512d | 6618 | unsigned long usemapsize = usemap_size(zone_start_pfn, zonesize); |
835c134e | 6619 | zone->pageblock_flags = NULL; |
23a7052a | 6620 | if (usemapsize) { |
6782832e | 6621 | zone->pageblock_flags = |
26fb3dae MR |
6622 | memblock_alloc_node(usemapsize, SMP_CACHE_BYTES, |
6623 | pgdat->node_id); | |
23a7052a MR |
6624 | if (!zone->pageblock_flags) |
6625 | panic("Failed to allocate %ld bytes for zone %s pageblock flags on node %d\n", | |
6626 | usemapsize, zone->name, pgdat->node_id); | |
6627 | } | |
835c134e MG |
6628 | } |
6629 | #else | |
7c45512d LT |
6630 | static inline void setup_usemap(struct pglist_data *pgdat, struct zone *zone, |
6631 | unsigned long zone_start_pfn, unsigned long zonesize) {} | |
835c134e MG |
6632 | #endif /* CONFIG_SPARSEMEM */ |
6633 | ||
d9c23400 | 6634 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
ba72cb8c | 6635 | |
d9c23400 | 6636 | /* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */ |
03e85f9d | 6637 | void __init set_pageblock_order(void) |
d9c23400 | 6638 | { |
955c1cd7 AM |
6639 | unsigned int order; |
6640 | ||
d9c23400 MG |
6641 | /* Check that pageblock_nr_pages has not already been setup */ |
6642 | if (pageblock_order) | |
6643 | return; | |
6644 | ||
955c1cd7 AM |
6645 | if (HPAGE_SHIFT > PAGE_SHIFT) |
6646 | order = HUGETLB_PAGE_ORDER; | |
6647 | else | |
6648 | order = MAX_ORDER - 1; | |
6649 | ||
d9c23400 MG |
6650 | /* |
6651 | * Assume the largest contiguous order of interest is a huge page. | |
955c1cd7 AM |
6652 | * This value may be variable depending on boot parameters on IA64 and |
6653 | * powerpc. | |
d9c23400 MG |
6654 | */ |
6655 | pageblock_order = order; | |
6656 | } | |
6657 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
6658 | ||
ba72cb8c MG |
6659 | /* |
6660 | * When CONFIG_HUGETLB_PAGE_SIZE_VARIABLE is not set, set_pageblock_order() | |
955c1cd7 AM |
6661 | * is unused as pageblock_order is set at compile-time. See |
6662 | * include/linux/pageblock-flags.h for the values of pageblock_order based on | |
6663 | * the kernel config | |
ba72cb8c | 6664 | */ |
03e85f9d | 6665 | void __init set_pageblock_order(void) |
ba72cb8c | 6666 | { |
ba72cb8c | 6667 | } |
d9c23400 MG |
6668 | |
6669 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
6670 | ||
03e85f9d | 6671 | static unsigned long __init calc_memmap_size(unsigned long spanned_pages, |
7cc2a959 | 6672 | unsigned long present_pages) |
01cefaef JL |
6673 | { |
6674 | unsigned long pages = spanned_pages; | |
6675 | ||
6676 | /* | |
6677 | * Provide a more accurate estimation if there are holes within | |
6678 | * the zone and SPARSEMEM is in use. If there are holes within the | |
6679 | * zone, each populated memory region may cost us one or two extra | |
6680 | * memmap pages due to alignment because memmap pages for each | |
89d790ab | 6681 | * populated regions may not be naturally aligned on page boundary. |
01cefaef JL |
6682 | * So the (present_pages >> 4) heuristic is a tradeoff for that. |
6683 | */ | |
6684 | if (spanned_pages > present_pages + (present_pages >> 4) && | |
6685 | IS_ENABLED(CONFIG_SPARSEMEM)) | |
6686 | pages = present_pages; | |
6687 | ||
6688 | return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT; | |
6689 | } | |
6690 | ||
ace1db39 OS |
6691 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
6692 | static void pgdat_init_split_queue(struct pglist_data *pgdat) | |
6693 | { | |
364c1eeb YS |
6694 | struct deferred_split *ds_queue = &pgdat->deferred_split_queue; |
6695 | ||
6696 | spin_lock_init(&ds_queue->split_queue_lock); | |
6697 | INIT_LIST_HEAD(&ds_queue->split_queue); | |
6698 | ds_queue->split_queue_len = 0; | |
ace1db39 OS |
6699 | } |
6700 | #else | |
6701 | static void pgdat_init_split_queue(struct pglist_data *pgdat) {} | |
6702 | #endif | |
6703 | ||
6704 | #ifdef CONFIG_COMPACTION | |
6705 | static void pgdat_init_kcompactd(struct pglist_data *pgdat) | |
6706 | { | |
6707 | init_waitqueue_head(&pgdat->kcompactd_wait); | |
6708 | } | |
6709 | #else | |
6710 | static void pgdat_init_kcompactd(struct pglist_data *pgdat) {} | |
6711 | #endif | |
6712 | ||
03e85f9d | 6713 | static void __meminit pgdat_init_internals(struct pglist_data *pgdat) |
1da177e4 | 6714 | { |
208d54e5 | 6715 | pgdat_resize_init(pgdat); |
ace1db39 | 6716 | |
ace1db39 OS |
6717 | pgdat_init_split_queue(pgdat); |
6718 | pgdat_init_kcompactd(pgdat); | |
6719 | ||
1da177e4 | 6720 | init_waitqueue_head(&pgdat->kswapd_wait); |
5515061d | 6721 | init_waitqueue_head(&pgdat->pfmemalloc_wait); |
ace1db39 | 6722 | |
eefa864b | 6723 | pgdat_page_ext_init(pgdat); |
a52633d8 | 6724 | spin_lock_init(&pgdat->lru_lock); |
867e5e1d | 6725 | lruvec_init(&pgdat->__lruvec); |
03e85f9d OS |
6726 | } |
6727 | ||
6728 | static void __meminit zone_init_internals(struct zone *zone, enum zone_type idx, int nid, | |
6729 | unsigned long remaining_pages) | |
6730 | { | |
9705bea5 | 6731 | atomic_long_set(&zone->managed_pages, remaining_pages); |
03e85f9d OS |
6732 | zone_set_nid(zone, nid); |
6733 | zone->name = zone_names[idx]; | |
6734 | zone->zone_pgdat = NODE_DATA(nid); | |
6735 | spin_lock_init(&zone->lock); | |
6736 | zone_seqlock_init(zone); | |
6737 | zone_pcp_init(zone); | |
6738 | } | |
6739 | ||
6740 | /* | |
6741 | * Set up the zone data structures | |
6742 | * - init pgdat internals | |
6743 | * - init all zones belonging to this node | |
6744 | * | |
6745 | * NOTE: this function is only called during memory hotplug | |
6746 | */ | |
6747 | #ifdef CONFIG_MEMORY_HOTPLUG | |
6748 | void __ref free_area_init_core_hotplug(int nid) | |
6749 | { | |
6750 | enum zone_type z; | |
6751 | pg_data_t *pgdat = NODE_DATA(nid); | |
6752 | ||
6753 | pgdat_init_internals(pgdat); | |
6754 | for (z = 0; z < MAX_NR_ZONES; z++) | |
6755 | zone_init_internals(&pgdat->node_zones[z], z, nid, 0); | |
6756 | } | |
6757 | #endif | |
6758 | ||
6759 | /* | |
6760 | * Set up the zone data structures: | |
6761 | * - mark all pages reserved | |
6762 | * - mark all memory queues empty | |
6763 | * - clear the memory bitmaps | |
6764 | * | |
6765 | * NOTE: pgdat should get zeroed by caller. | |
6766 | * NOTE: this function is only called during early init. | |
6767 | */ | |
6768 | static void __init free_area_init_core(struct pglist_data *pgdat) | |
6769 | { | |
6770 | enum zone_type j; | |
6771 | int nid = pgdat->node_id; | |
5f63b720 | 6772 | |
03e85f9d | 6773 | pgdat_init_internals(pgdat); |
385386cf JW |
6774 | pgdat->per_cpu_nodestats = &boot_nodestats; |
6775 | ||
1da177e4 LT |
6776 | for (j = 0; j < MAX_NR_ZONES; j++) { |
6777 | struct zone *zone = pgdat->node_zones + j; | |
e6943859 | 6778 | unsigned long size, freesize, memmap_pages; |
d91749c1 | 6779 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
1da177e4 | 6780 | |
febd5949 | 6781 | size = zone->spanned_pages; |
e6943859 | 6782 | freesize = zone->present_pages; |
1da177e4 | 6783 | |
0e0b864e | 6784 | /* |
9feedc9d | 6785 | * Adjust freesize so that it accounts for how much memory |
0e0b864e MG |
6786 | * is used by this zone for memmap. This affects the watermark |
6787 | * and per-cpu initialisations | |
6788 | */ | |
e6943859 | 6789 | memmap_pages = calc_memmap_size(size, freesize); |
ba914f48 ZH |
6790 | if (!is_highmem_idx(j)) { |
6791 | if (freesize >= memmap_pages) { | |
6792 | freesize -= memmap_pages; | |
6793 | if (memmap_pages) | |
6794 | printk(KERN_DEBUG | |
6795 | " %s zone: %lu pages used for memmap\n", | |
6796 | zone_names[j], memmap_pages); | |
6797 | } else | |
1170532b | 6798 | pr_warn(" %s zone: %lu pages exceeds freesize %lu\n", |
ba914f48 ZH |
6799 | zone_names[j], memmap_pages, freesize); |
6800 | } | |
0e0b864e | 6801 | |
6267276f | 6802 | /* Account for reserved pages */ |
9feedc9d JL |
6803 | if (j == 0 && freesize > dma_reserve) { |
6804 | freesize -= dma_reserve; | |
d903ef9f | 6805 | printk(KERN_DEBUG " %s zone: %lu pages reserved\n", |
6267276f | 6806 | zone_names[0], dma_reserve); |
0e0b864e MG |
6807 | } |
6808 | ||
98d2b0eb | 6809 | if (!is_highmem_idx(j)) |
9feedc9d | 6810 | nr_kernel_pages += freesize; |
01cefaef JL |
6811 | /* Charge for highmem memmap if there are enough kernel pages */ |
6812 | else if (nr_kernel_pages > memmap_pages * 2) | |
6813 | nr_kernel_pages -= memmap_pages; | |
9feedc9d | 6814 | nr_all_pages += freesize; |
1da177e4 | 6815 | |
9feedc9d JL |
6816 | /* |
6817 | * Set an approximate value for lowmem here, it will be adjusted | |
6818 | * when the bootmem allocator frees pages into the buddy system. | |
6819 | * And all highmem pages will be managed by the buddy system. | |
6820 | */ | |
03e85f9d | 6821 | zone_init_internals(zone, j, nid, freesize); |
81c0a2bb | 6822 | |
d883c6cf | 6823 | if (!size) |
1da177e4 LT |
6824 | continue; |
6825 | ||
955c1cd7 | 6826 | set_pageblock_order(); |
d883c6cf JK |
6827 | setup_usemap(pgdat, zone, zone_start_pfn, size); |
6828 | init_currently_empty_zone(zone, zone_start_pfn, size); | |
76cdd58e | 6829 | memmap_init(size, nid, j, zone_start_pfn); |
1da177e4 LT |
6830 | } |
6831 | } | |
6832 | ||
0cd842f9 | 6833 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
bd721ea7 | 6834 | static void __ref alloc_node_mem_map(struct pglist_data *pgdat) |
1da177e4 | 6835 | { |
b0aeba74 | 6836 | unsigned long __maybe_unused start = 0; |
a1c34a3b LA |
6837 | unsigned long __maybe_unused offset = 0; |
6838 | ||
1da177e4 LT |
6839 | /* Skip empty nodes */ |
6840 | if (!pgdat->node_spanned_pages) | |
6841 | return; | |
6842 | ||
b0aeba74 TL |
6843 | start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); |
6844 | offset = pgdat->node_start_pfn - start; | |
1da177e4 LT |
6845 | /* ia64 gets its own node_mem_map, before this, without bootmem */ |
6846 | if (!pgdat->node_mem_map) { | |
b0aeba74 | 6847 | unsigned long size, end; |
d41dee36 AW |
6848 | struct page *map; |
6849 | ||
e984bb43 BP |
6850 | /* |
6851 | * The zone's endpoints aren't required to be MAX_ORDER | |
6852 | * aligned but the node_mem_map endpoints must be in order | |
6853 | * for the buddy allocator to function correctly. | |
6854 | */ | |
108bcc96 | 6855 | end = pgdat_end_pfn(pgdat); |
e984bb43 BP |
6856 | end = ALIGN(end, MAX_ORDER_NR_PAGES); |
6857 | size = (end - start) * sizeof(struct page); | |
26fb3dae MR |
6858 | map = memblock_alloc_node(size, SMP_CACHE_BYTES, |
6859 | pgdat->node_id); | |
23a7052a MR |
6860 | if (!map) |
6861 | panic("Failed to allocate %ld bytes for node %d memory map\n", | |
6862 | size, pgdat->node_id); | |
a1c34a3b | 6863 | pgdat->node_mem_map = map + offset; |
1da177e4 | 6864 | } |
0cd842f9 OS |
6865 | pr_debug("%s: node %d, pgdat %08lx, node_mem_map %08lx\n", |
6866 | __func__, pgdat->node_id, (unsigned long)pgdat, | |
6867 | (unsigned long)pgdat->node_mem_map); | |
12d810c1 | 6868 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
6869 | /* |
6870 | * With no DISCONTIG, the global mem_map is just set as node 0's | |
6871 | */ | |
c713216d | 6872 | if (pgdat == NODE_DATA(0)) { |
1da177e4 | 6873 | mem_map = NODE_DATA(0)->node_mem_map; |
c713216d | 6874 | if (page_to_pfn(mem_map) != pgdat->node_start_pfn) |
a1c34a3b | 6875 | mem_map -= offset; |
c713216d | 6876 | } |
1da177e4 LT |
6877 | #endif |
6878 | } | |
0cd842f9 OS |
6879 | #else |
6880 | static void __ref alloc_node_mem_map(struct pglist_data *pgdat) { } | |
6881 | #endif /* CONFIG_FLAT_NODE_MEM_MAP */ | |
1da177e4 | 6882 | |
0188dc98 OS |
6883 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
6884 | static inline void pgdat_set_deferred_range(pg_data_t *pgdat) | |
6885 | { | |
0188dc98 OS |
6886 | pgdat->first_deferred_pfn = ULONG_MAX; |
6887 | } | |
6888 | #else | |
6889 | static inline void pgdat_set_deferred_range(pg_data_t *pgdat) {} | |
6890 | #endif | |
6891 | ||
854e8848 | 6892 | static void __init free_area_init_node(int nid) |
1da177e4 | 6893 | { |
9109fb7b | 6894 | pg_data_t *pgdat = NODE_DATA(nid); |
7960aedd ZY |
6895 | unsigned long start_pfn = 0; |
6896 | unsigned long end_pfn = 0; | |
9109fb7b | 6897 | |
88fdf75d | 6898 | /* pg_data_t should be reset to zero when it's allocated */ |
97a225e6 | 6899 | WARN_ON(pgdat->nr_zones || pgdat->kswapd_highest_zoneidx); |
88fdf75d | 6900 | |
854e8848 | 6901 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); |
88fdf75d | 6902 | |
1da177e4 | 6903 | pgdat->node_id = nid; |
854e8848 | 6904 | pgdat->node_start_pfn = start_pfn; |
75ef7184 | 6905 | pgdat->per_cpu_nodestats = NULL; |
854e8848 | 6906 | |
8d29e18a | 6907 | pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid, |
4ada0c5a ZL |
6908 | (u64)start_pfn << PAGE_SHIFT, |
6909 | end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0); | |
854e8848 | 6910 | calculate_node_totalpages(pgdat, start_pfn, end_pfn); |
1da177e4 LT |
6911 | |
6912 | alloc_node_mem_map(pgdat); | |
0188dc98 | 6913 | pgdat_set_deferred_range(pgdat); |
1da177e4 | 6914 | |
7f3eb55b | 6915 | free_area_init_core(pgdat); |
1da177e4 LT |
6916 | } |
6917 | ||
bc9331a1 | 6918 | void __init free_area_init_memoryless_node(int nid) |
3f08a302 | 6919 | { |
854e8848 | 6920 | free_area_init_node(nid); |
3f08a302 MR |
6921 | } |
6922 | ||
aca52c39 | 6923 | #if !defined(CONFIG_FLAT_NODE_MEM_MAP) |
ec393a0f | 6924 | /* |
4b094b78 DH |
6925 | * Initialize all valid struct pages in the range [spfn, epfn) and mark them |
6926 | * PageReserved(). Return the number of struct pages that were initialized. | |
ec393a0f | 6927 | */ |
4b094b78 | 6928 | static u64 __init init_unavailable_range(unsigned long spfn, unsigned long epfn) |
ec393a0f PT |
6929 | { |
6930 | unsigned long pfn; | |
6931 | u64 pgcnt = 0; | |
6932 | ||
6933 | for (pfn = spfn; pfn < epfn; pfn++) { | |
6934 | if (!pfn_valid(ALIGN_DOWN(pfn, pageblock_nr_pages))) { | |
6935 | pfn = ALIGN_DOWN(pfn, pageblock_nr_pages) | |
6936 | + pageblock_nr_pages - 1; | |
6937 | continue; | |
6938 | } | |
4b094b78 DH |
6939 | /* |
6940 | * Use a fake node/zone (0) for now. Some of these pages | |
6941 | * (in memblock.reserved but not in memblock.memory) will | |
6942 | * get re-initialized via reserve_bootmem_region() later. | |
6943 | */ | |
6944 | __init_single_page(pfn_to_page(pfn), pfn, 0, 0); | |
6945 | __SetPageReserved(pfn_to_page(pfn)); | |
ec393a0f PT |
6946 | pgcnt++; |
6947 | } | |
6948 | ||
6949 | return pgcnt; | |
6950 | } | |
6951 | ||
a4a3ede2 PT |
6952 | /* |
6953 | * Only struct pages that are backed by physical memory are zeroed and | |
6954 | * initialized by going through __init_single_page(). But, there are some | |
6955 | * struct pages which are reserved in memblock allocator and their fields | |
6956 | * may be accessed (for example page_to_pfn() on some configuration accesses | |
4b094b78 | 6957 | * flags). We must explicitly initialize those struct pages. |
907ec5fc NH |
6958 | * |
6959 | * This function also addresses a similar issue where struct pages are left | |
6960 | * uninitialized because the physical address range is not covered by | |
6961 | * memblock.memory or memblock.reserved. That could happen when memblock | |
e822969c DH |
6962 | * layout is manually configured via memmap=, or when the highest physical |
6963 | * address (max_pfn) does not end on a section boundary. | |
a4a3ede2 | 6964 | */ |
4b094b78 | 6965 | static void __init init_unavailable_mem(void) |
a4a3ede2 PT |
6966 | { |
6967 | phys_addr_t start, end; | |
a4a3ede2 | 6968 | u64 i, pgcnt; |
907ec5fc | 6969 | phys_addr_t next = 0; |
a4a3ede2 PT |
6970 | |
6971 | /* | |
907ec5fc | 6972 | * Loop through unavailable ranges not covered by memblock.memory. |
a4a3ede2 PT |
6973 | */ |
6974 | pgcnt = 0; | |
907ec5fc NH |
6975 | for_each_mem_range(i, &memblock.memory, NULL, |
6976 | NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end, NULL) { | |
ec393a0f | 6977 | if (next < start) |
4b094b78 DH |
6978 | pgcnt += init_unavailable_range(PFN_DOWN(next), |
6979 | PFN_UP(start)); | |
907ec5fc NH |
6980 | next = end; |
6981 | } | |
e822969c DH |
6982 | |
6983 | /* | |
6984 | * Early sections always have a fully populated memmap for the whole | |
6985 | * section - see pfn_valid(). If the last section has holes at the | |
6986 | * end and that section is marked "online", the memmap will be | |
6987 | * considered initialized. Make sure that memmap has a well defined | |
6988 | * state. | |
6989 | */ | |
4b094b78 DH |
6990 | pgcnt += init_unavailable_range(PFN_DOWN(next), |
6991 | round_up(max_pfn, PAGES_PER_SECTION)); | |
907ec5fc | 6992 | |
a4a3ede2 PT |
6993 | /* |
6994 | * Struct pages that do not have backing memory. This could be because | |
6995 | * firmware is using some of this memory, or for some other reasons. | |
a4a3ede2 PT |
6996 | */ |
6997 | if (pgcnt) | |
907ec5fc | 6998 | pr_info("Zeroed struct page in unavailable ranges: %lld pages", pgcnt); |
a4a3ede2 | 6999 | } |
4b094b78 DH |
7000 | #else |
7001 | static inline void __init init_unavailable_mem(void) | |
7002 | { | |
7003 | } | |
aca52c39 | 7004 | #endif /* !CONFIG_FLAT_NODE_MEM_MAP */ |
a4a3ede2 | 7005 | |
418508c1 MS |
7006 | #if MAX_NUMNODES > 1 |
7007 | /* | |
7008 | * Figure out the number of possible node ids. | |
7009 | */ | |
f9872caf | 7010 | void __init setup_nr_node_ids(void) |
418508c1 | 7011 | { |
904a9553 | 7012 | unsigned int highest; |
418508c1 | 7013 | |
904a9553 | 7014 | highest = find_last_bit(node_possible_map.bits, MAX_NUMNODES); |
418508c1 MS |
7015 | nr_node_ids = highest + 1; |
7016 | } | |
418508c1 MS |
7017 | #endif |
7018 | ||
1e01979c TH |
7019 | /** |
7020 | * node_map_pfn_alignment - determine the maximum internode alignment | |
7021 | * | |
7022 | * This function should be called after node map is populated and sorted. | |
7023 | * It calculates the maximum power of two alignment which can distinguish | |
7024 | * all the nodes. | |
7025 | * | |
7026 | * For example, if all nodes are 1GiB and aligned to 1GiB, the return value | |
7027 | * would indicate 1GiB alignment with (1 << (30 - PAGE_SHIFT)). If the | |
7028 | * nodes are shifted by 256MiB, 256MiB. Note that if only the last node is | |
7029 | * shifted, 1GiB is enough and this function will indicate so. | |
7030 | * | |
7031 | * This is used to test whether pfn -> nid mapping of the chosen memory | |
7032 | * model has fine enough granularity to avoid incorrect mapping for the | |
7033 | * populated node map. | |
7034 | * | |
a862f68a | 7035 | * Return: the determined alignment in pfn's. 0 if there is no alignment |
1e01979c TH |
7036 | * requirement (single node). |
7037 | */ | |
7038 | unsigned long __init node_map_pfn_alignment(void) | |
7039 | { | |
7040 | unsigned long accl_mask = 0, last_end = 0; | |
c13291a5 | 7041 | unsigned long start, end, mask; |
98fa15f3 | 7042 | int last_nid = NUMA_NO_NODE; |
c13291a5 | 7043 | int i, nid; |
1e01979c | 7044 | |
c13291a5 | 7045 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) { |
1e01979c TH |
7046 | if (!start || last_nid < 0 || last_nid == nid) { |
7047 | last_nid = nid; | |
7048 | last_end = end; | |
7049 | continue; | |
7050 | } | |
7051 | ||
7052 | /* | |
7053 | * Start with a mask granular enough to pin-point to the | |
7054 | * start pfn and tick off bits one-by-one until it becomes | |
7055 | * too coarse to separate the current node from the last. | |
7056 | */ | |
7057 | mask = ~((1 << __ffs(start)) - 1); | |
7058 | while (mask && last_end <= (start & (mask << 1))) | |
7059 | mask <<= 1; | |
7060 | ||
7061 | /* accumulate all internode masks */ | |
7062 | accl_mask |= mask; | |
7063 | } | |
7064 | ||
7065 | /* convert mask to number of pages */ | |
7066 | return ~accl_mask + 1; | |
7067 | } | |
7068 | ||
c713216d MG |
7069 | /** |
7070 | * find_min_pfn_with_active_regions - Find the minimum PFN registered | |
7071 | * | |
a862f68a | 7072 | * Return: the minimum PFN based on information provided via |
7d018176 | 7073 | * memblock_set_node(). |
c713216d MG |
7074 | */ |
7075 | unsigned long __init find_min_pfn_with_active_regions(void) | |
7076 | { | |
8a1b25fe | 7077 | return PHYS_PFN(memblock_start_of_DRAM()); |
c713216d MG |
7078 | } |
7079 | ||
37b07e41 LS |
7080 | /* |
7081 | * early_calculate_totalpages() | |
7082 | * Sum pages in active regions for movable zone. | |
4b0ef1fe | 7083 | * Populate N_MEMORY for calculating usable_nodes. |
37b07e41 | 7084 | */ |
484f51f8 | 7085 | static unsigned long __init early_calculate_totalpages(void) |
7e63efef | 7086 | { |
7e63efef | 7087 | unsigned long totalpages = 0; |
c13291a5 TH |
7088 | unsigned long start_pfn, end_pfn; |
7089 | int i, nid; | |
7090 | ||
7091 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { | |
7092 | unsigned long pages = end_pfn - start_pfn; | |
7e63efef | 7093 | |
37b07e41 LS |
7094 | totalpages += pages; |
7095 | if (pages) | |
4b0ef1fe | 7096 | node_set_state(nid, N_MEMORY); |
37b07e41 | 7097 | } |
b8af2941 | 7098 | return totalpages; |
7e63efef MG |
7099 | } |
7100 | ||
2a1e274a MG |
7101 | /* |
7102 | * Find the PFN the Movable zone begins in each node. Kernel memory | |
7103 | * is spread evenly between nodes as long as the nodes have enough | |
7104 | * memory. When they don't, some nodes will have more kernelcore than | |
7105 | * others | |
7106 | */ | |
b224ef85 | 7107 | static void __init find_zone_movable_pfns_for_nodes(void) |
2a1e274a MG |
7108 | { |
7109 | int i, nid; | |
7110 | unsigned long usable_startpfn; | |
7111 | unsigned long kernelcore_node, kernelcore_remaining; | |
66918dcd | 7112 | /* save the state before borrow the nodemask */ |
4b0ef1fe | 7113 | nodemask_t saved_node_state = node_states[N_MEMORY]; |
37b07e41 | 7114 | unsigned long totalpages = early_calculate_totalpages(); |
4b0ef1fe | 7115 | int usable_nodes = nodes_weight(node_states[N_MEMORY]); |
136199f0 | 7116 | struct memblock_region *r; |
b2f3eebe TC |
7117 | |
7118 | /* Need to find movable_zone earlier when movable_node is specified. */ | |
7119 | find_usable_zone_for_movable(); | |
7120 | ||
7121 | /* | |
7122 | * If movable_node is specified, ignore kernelcore and movablecore | |
7123 | * options. | |
7124 | */ | |
7125 | if (movable_node_is_enabled()) { | |
136199f0 EM |
7126 | for_each_memblock(memory, r) { |
7127 | if (!memblock_is_hotpluggable(r)) | |
b2f3eebe TC |
7128 | continue; |
7129 | ||
d622abf7 | 7130 | nid = memblock_get_region_node(r); |
b2f3eebe | 7131 | |
136199f0 | 7132 | usable_startpfn = PFN_DOWN(r->base); |
b2f3eebe TC |
7133 | zone_movable_pfn[nid] = zone_movable_pfn[nid] ? |
7134 | min(usable_startpfn, zone_movable_pfn[nid]) : | |
7135 | usable_startpfn; | |
7136 | } | |
7137 | ||
7138 | goto out2; | |
7139 | } | |
2a1e274a | 7140 | |
342332e6 TI |
7141 | /* |
7142 | * If kernelcore=mirror is specified, ignore movablecore option | |
7143 | */ | |
7144 | if (mirrored_kernelcore) { | |
7145 | bool mem_below_4gb_not_mirrored = false; | |
7146 | ||
7147 | for_each_memblock(memory, r) { | |
7148 | if (memblock_is_mirror(r)) | |
7149 | continue; | |
7150 | ||
d622abf7 | 7151 | nid = memblock_get_region_node(r); |
342332e6 TI |
7152 | |
7153 | usable_startpfn = memblock_region_memory_base_pfn(r); | |
7154 | ||
7155 | if (usable_startpfn < 0x100000) { | |
7156 | mem_below_4gb_not_mirrored = true; | |
7157 | continue; | |
7158 | } | |
7159 | ||
7160 | zone_movable_pfn[nid] = zone_movable_pfn[nid] ? | |
7161 | min(usable_startpfn, zone_movable_pfn[nid]) : | |
7162 | usable_startpfn; | |
7163 | } | |
7164 | ||
7165 | if (mem_below_4gb_not_mirrored) | |
633bf2fe | 7166 | pr_warn("This configuration results in unmirrored kernel memory.\n"); |
342332e6 TI |
7167 | |
7168 | goto out2; | |
7169 | } | |
7170 | ||
7e63efef | 7171 | /* |
a5c6d650 DR |
7172 | * If kernelcore=nn% or movablecore=nn% was specified, calculate the |
7173 | * amount of necessary memory. | |
7174 | */ | |
7175 | if (required_kernelcore_percent) | |
7176 | required_kernelcore = (totalpages * 100 * required_kernelcore_percent) / | |
7177 | 10000UL; | |
7178 | if (required_movablecore_percent) | |
7179 | required_movablecore = (totalpages * 100 * required_movablecore_percent) / | |
7180 | 10000UL; | |
7181 | ||
7182 | /* | |
7183 | * If movablecore= was specified, calculate what size of | |
7e63efef MG |
7184 | * kernelcore that corresponds so that memory usable for |
7185 | * any allocation type is evenly spread. If both kernelcore | |
7186 | * and movablecore are specified, then the value of kernelcore | |
7187 | * will be used for required_kernelcore if it's greater than | |
7188 | * what movablecore would have allowed. | |
7189 | */ | |
7190 | if (required_movablecore) { | |
7e63efef MG |
7191 | unsigned long corepages; |
7192 | ||
7193 | /* | |
7194 | * Round-up so that ZONE_MOVABLE is at least as large as what | |
7195 | * was requested by the user | |
7196 | */ | |
7197 | required_movablecore = | |
7198 | roundup(required_movablecore, MAX_ORDER_NR_PAGES); | |
9fd745d4 | 7199 | required_movablecore = min(totalpages, required_movablecore); |
7e63efef MG |
7200 | corepages = totalpages - required_movablecore; |
7201 | ||
7202 | required_kernelcore = max(required_kernelcore, corepages); | |
7203 | } | |
7204 | ||
bde304bd XQ |
7205 | /* |
7206 | * If kernelcore was not specified or kernelcore size is larger | |
7207 | * than totalpages, there is no ZONE_MOVABLE. | |
7208 | */ | |
7209 | if (!required_kernelcore || required_kernelcore >= totalpages) | |
66918dcd | 7210 | goto out; |
2a1e274a MG |
7211 | |
7212 | /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ | |
2a1e274a MG |
7213 | usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; |
7214 | ||
7215 | restart: | |
7216 | /* Spread kernelcore memory as evenly as possible throughout nodes */ | |
7217 | kernelcore_node = required_kernelcore / usable_nodes; | |
4b0ef1fe | 7218 | for_each_node_state(nid, N_MEMORY) { |
c13291a5 TH |
7219 | unsigned long start_pfn, end_pfn; |
7220 | ||
2a1e274a MG |
7221 | /* |
7222 | * Recalculate kernelcore_node if the division per node | |
7223 | * now exceeds what is necessary to satisfy the requested | |
7224 | * amount of memory for the kernel | |
7225 | */ | |
7226 | if (required_kernelcore < kernelcore_node) | |
7227 | kernelcore_node = required_kernelcore / usable_nodes; | |
7228 | ||
7229 | /* | |
7230 | * As the map is walked, we track how much memory is usable | |
7231 | * by the kernel using kernelcore_remaining. When it is | |
7232 | * 0, the rest of the node is usable by ZONE_MOVABLE | |
7233 | */ | |
7234 | kernelcore_remaining = kernelcore_node; | |
7235 | ||
7236 | /* Go through each range of PFNs within this node */ | |
c13291a5 | 7237 | for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
2a1e274a MG |
7238 | unsigned long size_pages; |
7239 | ||
c13291a5 | 7240 | start_pfn = max(start_pfn, zone_movable_pfn[nid]); |
2a1e274a MG |
7241 | if (start_pfn >= end_pfn) |
7242 | continue; | |
7243 | ||
7244 | /* Account for what is only usable for kernelcore */ | |
7245 | if (start_pfn < usable_startpfn) { | |
7246 | unsigned long kernel_pages; | |
7247 | kernel_pages = min(end_pfn, usable_startpfn) | |
7248 | - start_pfn; | |
7249 | ||
7250 | kernelcore_remaining -= min(kernel_pages, | |
7251 | kernelcore_remaining); | |
7252 | required_kernelcore -= min(kernel_pages, | |
7253 | required_kernelcore); | |
7254 | ||
7255 | /* Continue if range is now fully accounted */ | |
7256 | if (end_pfn <= usable_startpfn) { | |
7257 | ||
7258 | /* | |
7259 | * Push zone_movable_pfn to the end so | |
7260 | * that if we have to rebalance | |
7261 | * kernelcore across nodes, we will | |
7262 | * not double account here | |
7263 | */ | |
7264 | zone_movable_pfn[nid] = end_pfn; | |
7265 | continue; | |
7266 | } | |
7267 | start_pfn = usable_startpfn; | |
7268 | } | |
7269 | ||
7270 | /* | |
7271 | * The usable PFN range for ZONE_MOVABLE is from | |
7272 | * start_pfn->end_pfn. Calculate size_pages as the | |
7273 | * number of pages used as kernelcore | |
7274 | */ | |
7275 | size_pages = end_pfn - start_pfn; | |
7276 | if (size_pages > kernelcore_remaining) | |
7277 | size_pages = kernelcore_remaining; | |
7278 | zone_movable_pfn[nid] = start_pfn + size_pages; | |
7279 | ||
7280 | /* | |
7281 | * Some kernelcore has been met, update counts and | |
7282 | * break if the kernelcore for this node has been | |
b8af2941 | 7283 | * satisfied |
2a1e274a MG |
7284 | */ |
7285 | required_kernelcore -= min(required_kernelcore, | |
7286 | size_pages); | |
7287 | kernelcore_remaining -= size_pages; | |
7288 | if (!kernelcore_remaining) | |
7289 | break; | |
7290 | } | |
7291 | } | |
7292 | ||
7293 | /* | |
7294 | * If there is still required_kernelcore, we do another pass with one | |
7295 | * less node in the count. This will push zone_movable_pfn[nid] further | |
7296 | * along on the nodes that still have memory until kernelcore is | |
b8af2941 | 7297 | * satisfied |
2a1e274a MG |
7298 | */ |
7299 | usable_nodes--; | |
7300 | if (usable_nodes && required_kernelcore > usable_nodes) | |
7301 | goto restart; | |
7302 | ||
b2f3eebe | 7303 | out2: |
2a1e274a MG |
7304 | /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */ |
7305 | for (nid = 0; nid < MAX_NUMNODES; nid++) | |
7306 | zone_movable_pfn[nid] = | |
7307 | roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES); | |
66918dcd | 7308 | |
20e6926d | 7309 | out: |
66918dcd | 7310 | /* restore the node_state */ |
4b0ef1fe | 7311 | node_states[N_MEMORY] = saved_node_state; |
2a1e274a MG |
7312 | } |
7313 | ||
4b0ef1fe LJ |
7314 | /* Any regular or high memory on that node ? */ |
7315 | static void check_for_memory(pg_data_t *pgdat, int nid) | |
37b07e41 | 7316 | { |
37b07e41 LS |
7317 | enum zone_type zone_type; |
7318 | ||
4b0ef1fe | 7319 | for (zone_type = 0; zone_type <= ZONE_MOVABLE - 1; zone_type++) { |
37b07e41 | 7320 | struct zone *zone = &pgdat->node_zones[zone_type]; |
b38a8725 | 7321 | if (populated_zone(zone)) { |
7b0e0c0e OS |
7322 | if (IS_ENABLED(CONFIG_HIGHMEM)) |
7323 | node_set_state(nid, N_HIGH_MEMORY); | |
7324 | if (zone_type <= ZONE_NORMAL) | |
4b0ef1fe | 7325 | node_set_state(nid, N_NORMAL_MEMORY); |
d0048b0e BL |
7326 | break; |
7327 | } | |
37b07e41 | 7328 | } |
37b07e41 LS |
7329 | } |
7330 | ||
51930df5 MR |
7331 | /* |
7332 | * Some architecturs, e.g. ARC may have ZONE_HIGHMEM below ZONE_NORMAL. For | |
7333 | * such cases we allow max_zone_pfn sorted in the descending order | |
7334 | */ | |
7335 | bool __weak arch_has_descending_max_zone_pfns(void) | |
7336 | { | |
7337 | return false; | |
7338 | } | |
7339 | ||
c713216d | 7340 | /** |
9691a071 | 7341 | * free_area_init - Initialise all pg_data_t and zone data |
88ca3b94 | 7342 | * @max_zone_pfn: an array of max PFNs for each zone |
c713216d MG |
7343 | * |
7344 | * This will call free_area_init_node() for each active node in the system. | |
7d018176 | 7345 | * Using the page ranges provided by memblock_set_node(), the size of each |
c713216d MG |
7346 | * zone in each node and their holes is calculated. If the maximum PFN |
7347 | * between two adjacent zones match, it is assumed that the zone is empty. | |
7348 | * For example, if arch_max_dma_pfn == arch_max_dma32_pfn, it is assumed | |
7349 | * that arch_max_dma32_pfn has no pages. It is also assumed that a zone | |
7350 | * starts where the previous one ended. For example, ZONE_DMA32 starts | |
7351 | * at arch_max_dma_pfn. | |
7352 | */ | |
9691a071 | 7353 | void __init free_area_init(unsigned long *max_zone_pfn) |
c713216d | 7354 | { |
c13291a5 | 7355 | unsigned long start_pfn, end_pfn; |
51930df5 MR |
7356 | int i, nid, zone; |
7357 | bool descending; | |
a6af2bc3 | 7358 | |
c713216d MG |
7359 | /* Record where the zone boundaries are */ |
7360 | memset(arch_zone_lowest_possible_pfn, 0, | |
7361 | sizeof(arch_zone_lowest_possible_pfn)); | |
7362 | memset(arch_zone_highest_possible_pfn, 0, | |
7363 | sizeof(arch_zone_highest_possible_pfn)); | |
90cae1fe OH |
7364 | |
7365 | start_pfn = find_min_pfn_with_active_regions(); | |
51930df5 | 7366 | descending = arch_has_descending_max_zone_pfns(); |
90cae1fe OH |
7367 | |
7368 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
51930df5 MR |
7369 | if (descending) |
7370 | zone = MAX_NR_ZONES - i - 1; | |
7371 | else | |
7372 | zone = i; | |
7373 | ||
7374 | if (zone == ZONE_MOVABLE) | |
2a1e274a | 7375 | continue; |
90cae1fe | 7376 | |
51930df5 MR |
7377 | end_pfn = max(max_zone_pfn[zone], start_pfn); |
7378 | arch_zone_lowest_possible_pfn[zone] = start_pfn; | |
7379 | arch_zone_highest_possible_pfn[zone] = end_pfn; | |
90cae1fe OH |
7380 | |
7381 | start_pfn = end_pfn; | |
c713216d | 7382 | } |
2a1e274a MG |
7383 | |
7384 | /* Find the PFNs that ZONE_MOVABLE begins at in each node */ | |
7385 | memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); | |
b224ef85 | 7386 | find_zone_movable_pfns_for_nodes(); |
c713216d | 7387 | |
c713216d | 7388 | /* Print out the zone ranges */ |
f88dfff5 | 7389 | pr_info("Zone ranges:\n"); |
2a1e274a MG |
7390 | for (i = 0; i < MAX_NR_ZONES; i++) { |
7391 | if (i == ZONE_MOVABLE) | |
7392 | continue; | |
f88dfff5 | 7393 | pr_info(" %-8s ", zone_names[i]); |
72f0ba02 DR |
7394 | if (arch_zone_lowest_possible_pfn[i] == |
7395 | arch_zone_highest_possible_pfn[i]) | |
f88dfff5 | 7396 | pr_cont("empty\n"); |
72f0ba02 | 7397 | else |
8d29e18a JG |
7398 | pr_cont("[mem %#018Lx-%#018Lx]\n", |
7399 | (u64)arch_zone_lowest_possible_pfn[i] | |
7400 | << PAGE_SHIFT, | |
7401 | ((u64)arch_zone_highest_possible_pfn[i] | |
a62e2f4f | 7402 | << PAGE_SHIFT) - 1); |
2a1e274a MG |
7403 | } |
7404 | ||
7405 | /* Print out the PFNs ZONE_MOVABLE begins at in each node */ | |
f88dfff5 | 7406 | pr_info("Movable zone start for each node\n"); |
2a1e274a MG |
7407 | for (i = 0; i < MAX_NUMNODES; i++) { |
7408 | if (zone_movable_pfn[i]) | |
8d29e18a JG |
7409 | pr_info(" Node %d: %#018Lx\n", i, |
7410 | (u64)zone_movable_pfn[i] << PAGE_SHIFT); | |
2a1e274a | 7411 | } |
c713216d | 7412 | |
f46edbd1 DW |
7413 | /* |
7414 | * Print out the early node map, and initialize the | |
7415 | * subsection-map relative to active online memory ranges to | |
7416 | * enable future "sub-section" extensions of the memory map. | |
7417 | */ | |
f88dfff5 | 7418 | pr_info("Early memory node ranges\n"); |
f46edbd1 | 7419 | for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { |
8d29e18a JG |
7420 | pr_info(" node %3d: [mem %#018Lx-%#018Lx]\n", nid, |
7421 | (u64)start_pfn << PAGE_SHIFT, | |
7422 | ((u64)end_pfn << PAGE_SHIFT) - 1); | |
f46edbd1 DW |
7423 | subsection_map_init(start_pfn, end_pfn - start_pfn); |
7424 | } | |
c713216d MG |
7425 | |
7426 | /* Initialise every node */ | |
708614e6 | 7427 | mminit_verify_pageflags_layout(); |
8ef82866 | 7428 | setup_nr_node_ids(); |
4b094b78 | 7429 | init_unavailable_mem(); |
c713216d MG |
7430 | for_each_online_node(nid) { |
7431 | pg_data_t *pgdat = NODE_DATA(nid); | |
854e8848 | 7432 | free_area_init_node(nid); |
37b07e41 LS |
7433 | |
7434 | /* Any memory on that node */ | |
7435 | if (pgdat->node_present_pages) | |
4b0ef1fe LJ |
7436 | node_set_state(nid, N_MEMORY); |
7437 | check_for_memory(pgdat, nid); | |
c713216d MG |
7438 | } |
7439 | } | |
2a1e274a | 7440 | |
a5c6d650 DR |
7441 | static int __init cmdline_parse_core(char *p, unsigned long *core, |
7442 | unsigned long *percent) | |
2a1e274a MG |
7443 | { |
7444 | unsigned long long coremem; | |
a5c6d650 DR |
7445 | char *endptr; |
7446 | ||
2a1e274a MG |
7447 | if (!p) |
7448 | return -EINVAL; | |
7449 | ||
a5c6d650 DR |
7450 | /* Value may be a percentage of total memory, otherwise bytes */ |
7451 | coremem = simple_strtoull(p, &endptr, 0); | |
7452 | if (*endptr == '%') { | |
7453 | /* Paranoid check for percent values greater than 100 */ | |
7454 | WARN_ON(coremem > 100); | |
2a1e274a | 7455 | |
a5c6d650 DR |
7456 | *percent = coremem; |
7457 | } else { | |
7458 | coremem = memparse(p, &p); | |
7459 | /* Paranoid check that UL is enough for the coremem value */ | |
7460 | WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX); | |
2a1e274a | 7461 | |
a5c6d650 DR |
7462 | *core = coremem >> PAGE_SHIFT; |
7463 | *percent = 0UL; | |
7464 | } | |
2a1e274a MG |
7465 | return 0; |
7466 | } | |
ed7ed365 | 7467 | |
7e63efef MG |
7468 | /* |
7469 | * kernelcore=size sets the amount of memory for use for allocations that | |
7470 | * cannot be reclaimed or migrated. | |
7471 | */ | |
7472 | static int __init cmdline_parse_kernelcore(char *p) | |
7473 | { | |
342332e6 TI |
7474 | /* parse kernelcore=mirror */ |
7475 | if (parse_option_str(p, "mirror")) { | |
7476 | mirrored_kernelcore = true; | |
7477 | return 0; | |
7478 | } | |
7479 | ||
a5c6d650 DR |
7480 | return cmdline_parse_core(p, &required_kernelcore, |
7481 | &required_kernelcore_percent); | |
7e63efef MG |
7482 | } |
7483 | ||
7484 | /* | |
7485 | * movablecore=size sets the amount of memory for use for allocations that | |
7486 | * can be reclaimed or migrated. | |
7487 | */ | |
7488 | static int __init cmdline_parse_movablecore(char *p) | |
7489 | { | |
a5c6d650 DR |
7490 | return cmdline_parse_core(p, &required_movablecore, |
7491 | &required_movablecore_percent); | |
7e63efef MG |
7492 | } |
7493 | ||
ed7ed365 | 7494 | early_param("kernelcore", cmdline_parse_kernelcore); |
7e63efef | 7495 | early_param("movablecore", cmdline_parse_movablecore); |
ed7ed365 | 7496 | |
c3d5f5f0 JL |
7497 | void adjust_managed_page_count(struct page *page, long count) |
7498 | { | |
9705bea5 | 7499 | atomic_long_add(count, &page_zone(page)->managed_pages); |
ca79b0c2 | 7500 | totalram_pages_add(count); |
3dcc0571 JL |
7501 | #ifdef CONFIG_HIGHMEM |
7502 | if (PageHighMem(page)) | |
ca79b0c2 | 7503 | totalhigh_pages_add(count); |
3dcc0571 | 7504 | #endif |
c3d5f5f0 | 7505 | } |
3dcc0571 | 7506 | EXPORT_SYMBOL(adjust_managed_page_count); |
c3d5f5f0 | 7507 | |
e5cb113f | 7508 | unsigned long free_reserved_area(void *start, void *end, int poison, const char *s) |
69afade7 | 7509 | { |
11199692 JL |
7510 | void *pos; |
7511 | unsigned long pages = 0; | |
69afade7 | 7512 | |
11199692 JL |
7513 | start = (void *)PAGE_ALIGN((unsigned long)start); |
7514 | end = (void *)((unsigned long)end & PAGE_MASK); | |
7515 | for (pos = start; pos < end; pos += PAGE_SIZE, pages++) { | |
0d834328 DH |
7516 | struct page *page = virt_to_page(pos); |
7517 | void *direct_map_addr; | |
7518 | ||
7519 | /* | |
7520 | * 'direct_map_addr' might be different from 'pos' | |
7521 | * because some architectures' virt_to_page() | |
7522 | * work with aliases. Getting the direct map | |
7523 | * address ensures that we get a _writeable_ | |
7524 | * alias for the memset(). | |
7525 | */ | |
7526 | direct_map_addr = page_address(page); | |
dbe67df4 | 7527 | if ((unsigned int)poison <= 0xFF) |
0d834328 DH |
7528 | memset(direct_map_addr, poison, PAGE_SIZE); |
7529 | ||
7530 | free_reserved_page(page); | |
69afade7 JL |
7531 | } |
7532 | ||
7533 | if (pages && s) | |
adb1fe9a JP |
7534 | pr_info("Freeing %s memory: %ldK\n", |
7535 | s, pages << (PAGE_SHIFT - 10)); | |
69afade7 JL |
7536 | |
7537 | return pages; | |
7538 | } | |
7539 | ||
cfa11e08 JL |
7540 | #ifdef CONFIG_HIGHMEM |
7541 | void free_highmem_page(struct page *page) | |
7542 | { | |
7543 | __free_reserved_page(page); | |
ca79b0c2 | 7544 | totalram_pages_inc(); |
9705bea5 | 7545 | atomic_long_inc(&page_zone(page)->managed_pages); |
ca79b0c2 | 7546 | totalhigh_pages_inc(); |
cfa11e08 JL |
7547 | } |
7548 | #endif | |
7549 | ||
7ee3d4e8 JL |
7550 | |
7551 | void __init mem_init_print_info(const char *str) | |
7552 | { | |
7553 | unsigned long physpages, codesize, datasize, rosize, bss_size; | |
7554 | unsigned long init_code_size, init_data_size; | |
7555 | ||
7556 | physpages = get_num_physpages(); | |
7557 | codesize = _etext - _stext; | |
7558 | datasize = _edata - _sdata; | |
7559 | rosize = __end_rodata - __start_rodata; | |
7560 | bss_size = __bss_stop - __bss_start; | |
7561 | init_data_size = __init_end - __init_begin; | |
7562 | init_code_size = _einittext - _sinittext; | |
7563 | ||
7564 | /* | |
7565 | * Detect special cases and adjust section sizes accordingly: | |
7566 | * 1) .init.* may be embedded into .data sections | |
7567 | * 2) .init.text.* may be out of [__init_begin, __init_end], | |
7568 | * please refer to arch/tile/kernel/vmlinux.lds.S. | |
7569 | * 3) .rodata.* may be embedded into .text or .data sections. | |
7570 | */ | |
7571 | #define adj_init_size(start, end, size, pos, adj) \ | |
b8af2941 PK |
7572 | do { \ |
7573 | if (start <= pos && pos < end && size > adj) \ | |
7574 | size -= adj; \ | |
7575 | } while (0) | |
7ee3d4e8 JL |
7576 | |
7577 | adj_init_size(__init_begin, __init_end, init_data_size, | |
7578 | _sinittext, init_code_size); | |
7579 | adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size); | |
7580 | adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size); | |
7581 | adj_init_size(_stext, _etext, codesize, __start_rodata, rosize); | |
7582 | adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize); | |
7583 | ||
7584 | #undef adj_init_size | |
7585 | ||
756a025f | 7586 | pr_info("Memory: %luK/%luK available (%luK kernel code, %luK rwdata, %luK rodata, %luK init, %luK bss, %luK reserved, %luK cma-reserved" |
7ee3d4e8 | 7587 | #ifdef CONFIG_HIGHMEM |
756a025f | 7588 | ", %luK highmem" |
7ee3d4e8 | 7589 | #endif |
756a025f JP |
7590 | "%s%s)\n", |
7591 | nr_free_pages() << (PAGE_SHIFT - 10), | |
7592 | physpages << (PAGE_SHIFT - 10), | |
7593 | codesize >> 10, datasize >> 10, rosize >> 10, | |
7594 | (init_data_size + init_code_size) >> 10, bss_size >> 10, | |
ca79b0c2 | 7595 | (physpages - totalram_pages() - totalcma_pages) << (PAGE_SHIFT - 10), |
756a025f | 7596 | totalcma_pages << (PAGE_SHIFT - 10), |
7ee3d4e8 | 7597 | #ifdef CONFIG_HIGHMEM |
ca79b0c2 | 7598 | totalhigh_pages() << (PAGE_SHIFT - 10), |
7ee3d4e8 | 7599 | #endif |
756a025f | 7600 | str ? ", " : "", str ? str : ""); |
7ee3d4e8 JL |
7601 | } |
7602 | ||
0e0b864e | 7603 | /** |
88ca3b94 RD |
7604 | * set_dma_reserve - set the specified number of pages reserved in the first zone |
7605 | * @new_dma_reserve: The number of pages to mark reserved | |
0e0b864e | 7606 | * |
013110a7 | 7607 | * The per-cpu batchsize and zone watermarks are determined by managed_pages. |
0e0b864e MG |
7608 | * In the DMA zone, a significant percentage may be consumed by kernel image |
7609 | * and other unfreeable allocations which can skew the watermarks badly. This | |
88ca3b94 RD |
7610 | * function may optionally be used to account for unfreeable pages in the |
7611 | * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and | |
7612 | * smaller per-cpu batchsize. | |
0e0b864e MG |
7613 | */ |
7614 | void __init set_dma_reserve(unsigned long new_dma_reserve) | |
7615 | { | |
7616 | dma_reserve = new_dma_reserve; | |
7617 | } | |
7618 | ||
005fd4bb | 7619 | static int page_alloc_cpu_dead(unsigned int cpu) |
1da177e4 | 7620 | { |
1da177e4 | 7621 | |
005fd4bb SAS |
7622 | lru_add_drain_cpu(cpu); |
7623 | drain_pages(cpu); | |
9f8f2172 | 7624 | |
005fd4bb SAS |
7625 | /* |
7626 | * Spill the event counters of the dead processor | |
7627 | * into the current processors event counters. | |
7628 | * This artificially elevates the count of the current | |
7629 | * processor. | |
7630 | */ | |
7631 | vm_events_fold_cpu(cpu); | |
9f8f2172 | 7632 | |
005fd4bb SAS |
7633 | /* |
7634 | * Zero the differential counters of the dead processor | |
7635 | * so that the vm statistics are consistent. | |
7636 | * | |
7637 | * This is only okay since the processor is dead and cannot | |
7638 | * race with what we are doing. | |
7639 | */ | |
7640 | cpu_vm_stats_fold(cpu); | |
7641 | return 0; | |
1da177e4 | 7642 | } |
1da177e4 | 7643 | |
e03a5125 NP |
7644 | #ifdef CONFIG_NUMA |
7645 | int hashdist = HASHDIST_DEFAULT; | |
7646 | ||
7647 | static int __init set_hashdist(char *str) | |
7648 | { | |
7649 | if (!str) | |
7650 | return 0; | |
7651 | hashdist = simple_strtoul(str, &str, 0); | |
7652 | return 1; | |
7653 | } | |
7654 | __setup("hashdist=", set_hashdist); | |
7655 | #endif | |
7656 | ||
1da177e4 LT |
7657 | void __init page_alloc_init(void) |
7658 | { | |
005fd4bb SAS |
7659 | int ret; |
7660 | ||
e03a5125 NP |
7661 | #ifdef CONFIG_NUMA |
7662 | if (num_node_state(N_MEMORY) == 1) | |
7663 | hashdist = 0; | |
7664 | #endif | |
7665 | ||
005fd4bb SAS |
7666 | ret = cpuhp_setup_state_nocalls(CPUHP_PAGE_ALLOC_DEAD, |
7667 | "mm/page_alloc:dead", NULL, | |
7668 | page_alloc_cpu_dead); | |
7669 | WARN_ON(ret < 0); | |
1da177e4 LT |
7670 | } |
7671 | ||
cb45b0e9 | 7672 | /* |
34b10060 | 7673 | * calculate_totalreserve_pages - called when sysctl_lowmem_reserve_ratio |
cb45b0e9 HA |
7674 | * or min_free_kbytes changes. |
7675 | */ | |
7676 | static void calculate_totalreserve_pages(void) | |
7677 | { | |
7678 | struct pglist_data *pgdat; | |
7679 | unsigned long reserve_pages = 0; | |
2f6726e5 | 7680 | enum zone_type i, j; |
cb45b0e9 HA |
7681 | |
7682 | for_each_online_pgdat(pgdat) { | |
281e3726 MG |
7683 | |
7684 | pgdat->totalreserve_pages = 0; | |
7685 | ||
cb45b0e9 HA |
7686 | for (i = 0; i < MAX_NR_ZONES; i++) { |
7687 | struct zone *zone = pgdat->node_zones + i; | |
3484b2de | 7688 | long max = 0; |
9705bea5 | 7689 | unsigned long managed_pages = zone_managed_pages(zone); |
cb45b0e9 HA |
7690 | |
7691 | /* Find valid and maximum lowmem_reserve in the zone */ | |
7692 | for (j = i; j < MAX_NR_ZONES; j++) { | |
7693 | if (zone->lowmem_reserve[j] > max) | |
7694 | max = zone->lowmem_reserve[j]; | |
7695 | } | |
7696 | ||
41858966 MG |
7697 | /* we treat the high watermark as reserved pages. */ |
7698 | max += high_wmark_pages(zone); | |
cb45b0e9 | 7699 | |
3d6357de AK |
7700 | if (max > managed_pages) |
7701 | max = managed_pages; | |
a8d01437 | 7702 | |
281e3726 | 7703 | pgdat->totalreserve_pages += max; |
a8d01437 | 7704 | |
cb45b0e9 HA |
7705 | reserve_pages += max; |
7706 | } | |
7707 | } | |
7708 | totalreserve_pages = reserve_pages; | |
7709 | } | |
7710 | ||
1da177e4 LT |
7711 | /* |
7712 | * setup_per_zone_lowmem_reserve - called whenever | |
34b10060 | 7713 | * sysctl_lowmem_reserve_ratio changes. Ensures that each zone |
1da177e4 LT |
7714 | * has a correct pages reserved value, so an adequate number of |
7715 | * pages are left in the zone after a successful __alloc_pages(). | |
7716 | */ | |
7717 | static void setup_per_zone_lowmem_reserve(void) | |
7718 | { | |
7719 | struct pglist_data *pgdat; | |
2f6726e5 | 7720 | enum zone_type j, idx; |
1da177e4 | 7721 | |
ec936fc5 | 7722 | for_each_online_pgdat(pgdat) { |
1da177e4 LT |
7723 | for (j = 0; j < MAX_NR_ZONES; j++) { |
7724 | struct zone *zone = pgdat->node_zones + j; | |
9705bea5 | 7725 | unsigned long managed_pages = zone_managed_pages(zone); |
1da177e4 LT |
7726 | |
7727 | zone->lowmem_reserve[j] = 0; | |
7728 | ||
2f6726e5 CL |
7729 | idx = j; |
7730 | while (idx) { | |
1da177e4 LT |
7731 | struct zone *lower_zone; |
7732 | ||
2f6726e5 | 7733 | idx--; |
1da177e4 | 7734 | lower_zone = pgdat->node_zones + idx; |
d3cda233 | 7735 | |
f6366156 BH |
7736 | if (!sysctl_lowmem_reserve_ratio[idx] || |
7737 | !zone_managed_pages(lower_zone)) { | |
d3cda233 | 7738 | lower_zone->lowmem_reserve[j] = 0; |
f6366156 | 7739 | continue; |
d3cda233 JK |
7740 | } else { |
7741 | lower_zone->lowmem_reserve[j] = | |
7742 | managed_pages / sysctl_lowmem_reserve_ratio[idx]; | |
7743 | } | |
9705bea5 | 7744 | managed_pages += zone_managed_pages(lower_zone); |
1da177e4 LT |
7745 | } |
7746 | } | |
7747 | } | |
cb45b0e9 HA |
7748 | |
7749 | /* update totalreserve_pages */ | |
7750 | calculate_totalreserve_pages(); | |
1da177e4 LT |
7751 | } |
7752 | ||
cfd3da1e | 7753 | static void __setup_per_zone_wmarks(void) |
1da177e4 LT |
7754 | { |
7755 | unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10); | |
7756 | unsigned long lowmem_pages = 0; | |
7757 | struct zone *zone; | |
7758 | unsigned long flags; | |
7759 | ||
7760 | /* Calculate total number of !ZONE_HIGHMEM pages */ | |
7761 | for_each_zone(zone) { | |
7762 | if (!is_highmem(zone)) | |
9705bea5 | 7763 | lowmem_pages += zone_managed_pages(zone); |
1da177e4 LT |
7764 | } |
7765 | ||
7766 | for_each_zone(zone) { | |
ac924c60 AM |
7767 | u64 tmp; |
7768 | ||
1125b4e3 | 7769 | spin_lock_irqsave(&zone->lock, flags); |
9705bea5 | 7770 | tmp = (u64)pages_min * zone_managed_pages(zone); |
ac924c60 | 7771 | do_div(tmp, lowmem_pages); |
1da177e4 LT |
7772 | if (is_highmem(zone)) { |
7773 | /* | |
669ed175 NP |
7774 | * __GFP_HIGH and PF_MEMALLOC allocations usually don't |
7775 | * need highmem pages, so cap pages_min to a small | |
7776 | * value here. | |
7777 | * | |
41858966 | 7778 | * The WMARK_HIGH-WMARK_LOW and (WMARK_LOW-WMARK_MIN) |
8bb4e7a2 | 7779 | * deltas control async page reclaim, and so should |
669ed175 | 7780 | * not be capped for highmem. |
1da177e4 | 7781 | */ |
90ae8d67 | 7782 | unsigned long min_pages; |
1da177e4 | 7783 | |
9705bea5 | 7784 | min_pages = zone_managed_pages(zone) / 1024; |
90ae8d67 | 7785 | min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL); |
a9214443 | 7786 | zone->_watermark[WMARK_MIN] = min_pages; |
1da177e4 | 7787 | } else { |
669ed175 NP |
7788 | /* |
7789 | * If it's a lowmem zone, reserve a number of pages | |
1da177e4 LT |
7790 | * proportionate to the zone's size. |
7791 | */ | |
a9214443 | 7792 | zone->_watermark[WMARK_MIN] = tmp; |
1da177e4 LT |
7793 | } |
7794 | ||
795ae7a0 JW |
7795 | /* |
7796 | * Set the kswapd watermarks distance according to the | |
7797 | * scale factor in proportion to available memory, but | |
7798 | * ensure a minimum size on small systems. | |
7799 | */ | |
7800 | tmp = max_t(u64, tmp >> 2, | |
9705bea5 | 7801 | mult_frac(zone_managed_pages(zone), |
795ae7a0 JW |
7802 | watermark_scale_factor, 10000)); |
7803 | ||
aa092591 | 7804 | zone->watermark_boost = 0; |
a9214443 MG |
7805 | zone->_watermark[WMARK_LOW] = min_wmark_pages(zone) + tmp; |
7806 | zone->_watermark[WMARK_HIGH] = min_wmark_pages(zone) + tmp * 2; | |
49f223a9 | 7807 | |
1125b4e3 | 7808 | spin_unlock_irqrestore(&zone->lock, flags); |
1da177e4 | 7809 | } |
cb45b0e9 HA |
7810 | |
7811 | /* update totalreserve_pages */ | |
7812 | calculate_totalreserve_pages(); | |
1da177e4 LT |
7813 | } |
7814 | ||
cfd3da1e MG |
7815 | /** |
7816 | * setup_per_zone_wmarks - called when min_free_kbytes changes | |
7817 | * or when memory is hot-{added|removed} | |
7818 | * | |
7819 | * Ensures that the watermark[min,low,high] values for each zone are set | |
7820 | * correctly with respect to min_free_kbytes. | |
7821 | */ | |
7822 | void setup_per_zone_wmarks(void) | |
7823 | { | |
b93e0f32 MH |
7824 | static DEFINE_SPINLOCK(lock); |
7825 | ||
7826 | spin_lock(&lock); | |
cfd3da1e | 7827 | __setup_per_zone_wmarks(); |
b93e0f32 | 7828 | spin_unlock(&lock); |
cfd3da1e MG |
7829 | } |
7830 | ||
1da177e4 LT |
7831 | /* |
7832 | * Initialise min_free_kbytes. | |
7833 | * | |
7834 | * For small machines we want it small (128k min). For large machines | |
8beeae86 | 7835 | * we want it large (256MB max). But it is not linear, because network |
1da177e4 LT |
7836 | * bandwidth does not increase linearly with machine size. We use |
7837 | * | |
b8af2941 | 7838 | * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: |
1da177e4 LT |
7839 | * min_free_kbytes = sqrt(lowmem_kbytes * 16) |
7840 | * | |
7841 | * which yields | |
7842 | * | |
7843 | * 16MB: 512k | |
7844 | * 32MB: 724k | |
7845 | * 64MB: 1024k | |
7846 | * 128MB: 1448k | |
7847 | * 256MB: 2048k | |
7848 | * 512MB: 2896k | |
7849 | * 1024MB: 4096k | |
7850 | * 2048MB: 5792k | |
7851 | * 4096MB: 8192k | |
7852 | * 8192MB: 11584k | |
7853 | * 16384MB: 16384k | |
7854 | */ | |
1b79acc9 | 7855 | int __meminit init_per_zone_wmark_min(void) |
1da177e4 LT |
7856 | { |
7857 | unsigned long lowmem_kbytes; | |
5f12733e | 7858 | int new_min_free_kbytes; |
1da177e4 LT |
7859 | |
7860 | lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); | |
5f12733e MH |
7861 | new_min_free_kbytes = int_sqrt(lowmem_kbytes * 16); |
7862 | ||
7863 | if (new_min_free_kbytes > user_min_free_kbytes) { | |
7864 | min_free_kbytes = new_min_free_kbytes; | |
7865 | if (min_free_kbytes < 128) | |
7866 | min_free_kbytes = 128; | |
ee8eb9a5 JS |
7867 | if (min_free_kbytes > 262144) |
7868 | min_free_kbytes = 262144; | |
5f12733e MH |
7869 | } else { |
7870 | pr_warn("min_free_kbytes is not updated to %d because user defined value %d is preferred\n", | |
7871 | new_min_free_kbytes, user_min_free_kbytes); | |
7872 | } | |
bc75d33f | 7873 | setup_per_zone_wmarks(); |
a6cccdc3 | 7874 | refresh_zone_stat_thresholds(); |
1da177e4 | 7875 | setup_per_zone_lowmem_reserve(); |
6423aa81 JK |
7876 | |
7877 | #ifdef CONFIG_NUMA | |
7878 | setup_min_unmapped_ratio(); | |
7879 | setup_min_slab_ratio(); | |
7880 | #endif | |
7881 | ||
1da177e4 LT |
7882 | return 0; |
7883 | } | |
bc22af74 | 7884 | core_initcall(init_per_zone_wmark_min) |
1da177e4 LT |
7885 | |
7886 | /* | |
b8af2941 | 7887 | * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so |
1da177e4 LT |
7888 | * that we can call two helper functions whenever min_free_kbytes |
7889 | * changes. | |
7890 | */ | |
cccad5b9 | 7891 | int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write, |
32927393 | 7892 | void *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 7893 | { |
da8c757b HP |
7894 | int rc; |
7895 | ||
7896 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
7897 | if (rc) | |
7898 | return rc; | |
7899 | ||
5f12733e MH |
7900 | if (write) { |
7901 | user_min_free_kbytes = min_free_kbytes; | |
bc75d33f | 7902 | setup_per_zone_wmarks(); |
5f12733e | 7903 | } |
1da177e4 LT |
7904 | return 0; |
7905 | } | |
7906 | ||
795ae7a0 | 7907 | int watermark_scale_factor_sysctl_handler(struct ctl_table *table, int write, |
32927393 | 7908 | void *buffer, size_t *length, loff_t *ppos) |
795ae7a0 JW |
7909 | { |
7910 | int rc; | |
7911 | ||
7912 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
7913 | if (rc) | |
7914 | return rc; | |
7915 | ||
7916 | if (write) | |
7917 | setup_per_zone_wmarks(); | |
7918 | ||
7919 | return 0; | |
7920 | } | |
7921 | ||
9614634f | 7922 | #ifdef CONFIG_NUMA |
6423aa81 | 7923 | static void setup_min_unmapped_ratio(void) |
9614634f | 7924 | { |
6423aa81 | 7925 | pg_data_t *pgdat; |
9614634f | 7926 | struct zone *zone; |
9614634f | 7927 | |
a5f5f91d | 7928 | for_each_online_pgdat(pgdat) |
81cbcbc2 | 7929 | pgdat->min_unmapped_pages = 0; |
a5f5f91d | 7930 | |
9614634f | 7931 | for_each_zone(zone) |
9705bea5 AK |
7932 | zone->zone_pgdat->min_unmapped_pages += (zone_managed_pages(zone) * |
7933 | sysctl_min_unmapped_ratio) / 100; | |
9614634f | 7934 | } |
0ff38490 | 7935 | |
6423aa81 JK |
7936 | |
7937 | int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write, | |
32927393 | 7938 | void *buffer, size_t *length, loff_t *ppos) |
0ff38490 | 7939 | { |
0ff38490 CL |
7940 | int rc; |
7941 | ||
8d65af78 | 7942 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
0ff38490 CL |
7943 | if (rc) |
7944 | return rc; | |
7945 | ||
6423aa81 JK |
7946 | setup_min_unmapped_ratio(); |
7947 | ||
7948 | return 0; | |
7949 | } | |
7950 | ||
7951 | static void setup_min_slab_ratio(void) | |
7952 | { | |
7953 | pg_data_t *pgdat; | |
7954 | struct zone *zone; | |
7955 | ||
a5f5f91d MG |
7956 | for_each_online_pgdat(pgdat) |
7957 | pgdat->min_slab_pages = 0; | |
7958 | ||
0ff38490 | 7959 | for_each_zone(zone) |
9705bea5 AK |
7960 | zone->zone_pgdat->min_slab_pages += (zone_managed_pages(zone) * |
7961 | sysctl_min_slab_ratio) / 100; | |
6423aa81 JK |
7962 | } |
7963 | ||
7964 | int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write, | |
32927393 | 7965 | void *buffer, size_t *length, loff_t *ppos) |
6423aa81 JK |
7966 | { |
7967 | int rc; | |
7968 | ||
7969 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); | |
7970 | if (rc) | |
7971 | return rc; | |
7972 | ||
7973 | setup_min_slab_ratio(); | |
7974 | ||
0ff38490 CL |
7975 | return 0; |
7976 | } | |
9614634f CL |
7977 | #endif |
7978 | ||
1da177e4 LT |
7979 | /* |
7980 | * lowmem_reserve_ratio_sysctl_handler - just a wrapper around | |
7981 | * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve() | |
7982 | * whenever sysctl_lowmem_reserve_ratio changes. | |
7983 | * | |
7984 | * The reserve ratio obviously has absolutely no relation with the | |
41858966 | 7985 | * minimum watermarks. The lowmem reserve ratio can only make sense |
1da177e4 LT |
7986 | * if in function of the boot time zone sizes. |
7987 | */ | |
cccad5b9 | 7988 | int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *table, int write, |
32927393 | 7989 | void *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 7990 | { |
86aaf255 BH |
7991 | int i; |
7992 | ||
8d65af78 | 7993 | proc_dointvec_minmax(table, write, buffer, length, ppos); |
86aaf255 BH |
7994 | |
7995 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
7996 | if (sysctl_lowmem_reserve_ratio[i] < 1) | |
7997 | sysctl_lowmem_reserve_ratio[i] = 0; | |
7998 | } | |
7999 | ||
1da177e4 LT |
8000 | setup_per_zone_lowmem_reserve(); |
8001 | return 0; | |
8002 | } | |
8003 | ||
cb1ef534 MG |
8004 | static void __zone_pcp_update(struct zone *zone) |
8005 | { | |
8006 | unsigned int cpu; | |
8007 | ||
8008 | for_each_possible_cpu(cpu) | |
8009 | pageset_set_high_and_batch(zone, | |
8010 | per_cpu_ptr(zone->pageset, cpu)); | |
8011 | } | |
8012 | ||
8ad4b1fb RS |
8013 | /* |
8014 | * percpu_pagelist_fraction - changes the pcp->high for each zone on each | |
b8af2941 PK |
8015 | * cpu. It is the fraction of total pages in each zone that a hot per cpu |
8016 | * pagelist can have before it gets flushed back to buddy allocator. | |
8ad4b1fb | 8017 | */ |
cccad5b9 | 8018 | int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *table, int write, |
32927393 | 8019 | void *buffer, size_t *length, loff_t *ppos) |
8ad4b1fb RS |
8020 | { |
8021 | struct zone *zone; | |
7cd2b0a3 | 8022 | int old_percpu_pagelist_fraction; |
8ad4b1fb RS |
8023 | int ret; |
8024 | ||
7cd2b0a3 DR |
8025 | mutex_lock(&pcp_batch_high_lock); |
8026 | old_percpu_pagelist_fraction = percpu_pagelist_fraction; | |
8027 | ||
8d65af78 | 8028 | ret = proc_dointvec_minmax(table, write, buffer, length, ppos); |
7cd2b0a3 DR |
8029 | if (!write || ret < 0) |
8030 | goto out; | |
8031 | ||
8032 | /* Sanity checking to avoid pcp imbalance */ | |
8033 | if (percpu_pagelist_fraction && | |
8034 | percpu_pagelist_fraction < MIN_PERCPU_PAGELIST_FRACTION) { | |
8035 | percpu_pagelist_fraction = old_percpu_pagelist_fraction; | |
8036 | ret = -EINVAL; | |
8037 | goto out; | |
8038 | } | |
8039 | ||
8040 | /* No change? */ | |
8041 | if (percpu_pagelist_fraction == old_percpu_pagelist_fraction) | |
8042 | goto out; | |
c8e251fa | 8043 | |
cb1ef534 MG |
8044 | for_each_populated_zone(zone) |
8045 | __zone_pcp_update(zone); | |
7cd2b0a3 | 8046 | out: |
c8e251fa | 8047 | mutex_unlock(&pcp_batch_high_lock); |
7cd2b0a3 | 8048 | return ret; |
8ad4b1fb RS |
8049 | } |
8050 | ||
f6f34b43 SD |
8051 | #ifndef __HAVE_ARCH_RESERVED_KERNEL_PAGES |
8052 | /* | |
8053 | * Returns the number of pages that arch has reserved but | |
8054 | * is not known to alloc_large_system_hash(). | |
8055 | */ | |
8056 | static unsigned long __init arch_reserved_kernel_pages(void) | |
8057 | { | |
8058 | return 0; | |
8059 | } | |
8060 | #endif | |
8061 | ||
9017217b PT |
8062 | /* |
8063 | * Adaptive scale is meant to reduce sizes of hash tables on large memory | |
8064 | * machines. As memory size is increased the scale is also increased but at | |
8065 | * slower pace. Starting from ADAPT_SCALE_BASE (64G), every time memory | |
8066 | * quadruples the scale is increased by one, which means the size of hash table | |
8067 | * only doubles, instead of quadrupling as well. | |
8068 | * Because 32-bit systems cannot have large physical memory, where this scaling | |
8069 | * makes sense, it is disabled on such platforms. | |
8070 | */ | |
8071 | #if __BITS_PER_LONG > 32 | |
8072 | #define ADAPT_SCALE_BASE (64ul << 30) | |
8073 | #define ADAPT_SCALE_SHIFT 2 | |
8074 | #define ADAPT_SCALE_NPAGES (ADAPT_SCALE_BASE >> PAGE_SHIFT) | |
8075 | #endif | |
8076 | ||
1da177e4 LT |
8077 | /* |
8078 | * allocate a large system hash table from bootmem | |
8079 | * - it is assumed that the hash table must contain an exact power-of-2 | |
8080 | * quantity of entries | |
8081 | * - limit is the number of hash buckets, not the total allocation size | |
8082 | */ | |
8083 | void *__init alloc_large_system_hash(const char *tablename, | |
8084 | unsigned long bucketsize, | |
8085 | unsigned long numentries, | |
8086 | int scale, | |
8087 | int flags, | |
8088 | unsigned int *_hash_shift, | |
8089 | unsigned int *_hash_mask, | |
31fe62b9 TB |
8090 | unsigned long low_limit, |
8091 | unsigned long high_limit) | |
1da177e4 | 8092 | { |
31fe62b9 | 8093 | unsigned long long max = high_limit; |
1da177e4 LT |
8094 | unsigned long log2qty, size; |
8095 | void *table = NULL; | |
3749a8f0 | 8096 | gfp_t gfp_flags; |
ec11408a | 8097 | bool virt; |
1da177e4 LT |
8098 | |
8099 | /* allow the kernel cmdline to have a say */ | |
8100 | if (!numentries) { | |
8101 | /* round applicable memory size up to nearest megabyte */ | |
04903664 | 8102 | numentries = nr_kernel_pages; |
f6f34b43 | 8103 | numentries -= arch_reserved_kernel_pages(); |
a7e83318 JZ |
8104 | |
8105 | /* It isn't necessary when PAGE_SIZE >= 1MB */ | |
8106 | if (PAGE_SHIFT < 20) | |
8107 | numentries = round_up(numentries, (1<<20)/PAGE_SIZE); | |
1da177e4 | 8108 | |
9017217b PT |
8109 | #if __BITS_PER_LONG > 32 |
8110 | if (!high_limit) { | |
8111 | unsigned long adapt; | |
8112 | ||
8113 | for (adapt = ADAPT_SCALE_NPAGES; adapt < numentries; | |
8114 | adapt <<= ADAPT_SCALE_SHIFT) | |
8115 | scale++; | |
8116 | } | |
8117 | #endif | |
8118 | ||
1da177e4 LT |
8119 | /* limit to 1 bucket per 2^scale bytes of low memory */ |
8120 | if (scale > PAGE_SHIFT) | |
8121 | numentries >>= (scale - PAGE_SHIFT); | |
8122 | else | |
8123 | numentries <<= (PAGE_SHIFT - scale); | |
9ab37b8f PM |
8124 | |
8125 | /* Make sure we've got at least a 0-order allocation.. */ | |
2c85f51d JB |
8126 | if (unlikely(flags & HASH_SMALL)) { |
8127 | /* Makes no sense without HASH_EARLY */ | |
8128 | WARN_ON(!(flags & HASH_EARLY)); | |
8129 | if (!(numentries >> *_hash_shift)) { | |
8130 | numentries = 1UL << *_hash_shift; | |
8131 | BUG_ON(!numentries); | |
8132 | } | |
8133 | } else if (unlikely((numentries * bucketsize) < PAGE_SIZE)) | |
9ab37b8f | 8134 | numentries = PAGE_SIZE / bucketsize; |
1da177e4 | 8135 | } |
6e692ed3 | 8136 | numentries = roundup_pow_of_two(numentries); |
1da177e4 LT |
8137 | |
8138 | /* limit allocation size to 1/16 total memory by default */ | |
8139 | if (max == 0) { | |
8140 | max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4; | |
8141 | do_div(max, bucketsize); | |
8142 | } | |
074b8517 | 8143 | max = min(max, 0x80000000ULL); |
1da177e4 | 8144 | |
31fe62b9 TB |
8145 | if (numentries < low_limit) |
8146 | numentries = low_limit; | |
1da177e4 LT |
8147 | if (numentries > max) |
8148 | numentries = max; | |
8149 | ||
f0d1b0b3 | 8150 | log2qty = ilog2(numentries); |
1da177e4 | 8151 | |
3749a8f0 | 8152 | gfp_flags = (flags & HASH_ZERO) ? GFP_ATOMIC | __GFP_ZERO : GFP_ATOMIC; |
1da177e4 | 8153 | do { |
ec11408a | 8154 | virt = false; |
1da177e4 | 8155 | size = bucketsize << log2qty; |
ea1f5f37 PT |
8156 | if (flags & HASH_EARLY) { |
8157 | if (flags & HASH_ZERO) | |
26fb3dae | 8158 | table = memblock_alloc(size, SMP_CACHE_BYTES); |
ea1f5f37 | 8159 | else |
7e1c4e27 MR |
8160 | table = memblock_alloc_raw(size, |
8161 | SMP_CACHE_BYTES); | |
ec11408a | 8162 | } else if (get_order(size) >= MAX_ORDER || hashdist) { |
88dca4ca | 8163 | table = __vmalloc(size, gfp_flags); |
ec11408a | 8164 | virt = true; |
ea1f5f37 | 8165 | } else { |
1037b83b ED |
8166 | /* |
8167 | * If bucketsize is not a power-of-two, we may free | |
a1dd268c MG |
8168 | * some pages at the end of hash table which |
8169 | * alloc_pages_exact() automatically does | |
1037b83b | 8170 | */ |
ec11408a NP |
8171 | table = alloc_pages_exact(size, gfp_flags); |
8172 | kmemleak_alloc(table, size, 1, gfp_flags); | |
1da177e4 LT |
8173 | } |
8174 | } while (!table && size > PAGE_SIZE && --log2qty); | |
8175 | ||
8176 | if (!table) | |
8177 | panic("Failed to allocate %s hash table\n", tablename); | |
8178 | ||
ec11408a NP |
8179 | pr_info("%s hash table entries: %ld (order: %d, %lu bytes, %s)\n", |
8180 | tablename, 1UL << log2qty, ilog2(size) - PAGE_SHIFT, size, | |
8181 | virt ? "vmalloc" : "linear"); | |
1da177e4 LT |
8182 | |
8183 | if (_hash_shift) | |
8184 | *_hash_shift = log2qty; | |
8185 | if (_hash_mask) | |
8186 | *_hash_mask = (1 << log2qty) - 1; | |
8187 | ||
8188 | return table; | |
8189 | } | |
a117e66e | 8190 | |
a5d76b54 | 8191 | /* |
80934513 | 8192 | * This function checks whether pageblock includes unmovable pages or not. |
80934513 | 8193 | * |
b8af2941 | 8194 | * PageLRU check without isolation or lru_lock could race so that |
0efadf48 YX |
8195 | * MIGRATE_MOVABLE block might include unmovable pages. And __PageMovable |
8196 | * check without lock_page also may miss some movable non-lru pages at | |
8197 | * race condition. So you can't expect this function should be exact. | |
4a55c047 QC |
8198 | * |
8199 | * Returns a page without holding a reference. If the caller wants to | |
8200 | * dereference that page (e.g., dumping), it has to make sure that that it | |
8201 | * cannot get removed (e.g., via memory unplug) concurrently. | |
8202 | * | |
a5d76b54 | 8203 | */ |
4a55c047 QC |
8204 | struct page *has_unmovable_pages(struct zone *zone, struct page *page, |
8205 | int migratetype, int flags) | |
49ac8255 | 8206 | { |
1a9f2191 QC |
8207 | unsigned long iter = 0; |
8208 | unsigned long pfn = page_to_pfn(page); | |
47118af0 | 8209 | |
49ac8255 | 8210 | /* |
15c30bc0 MH |
8211 | * TODO we could make this much more efficient by not checking every |
8212 | * page in the range if we know all of them are in MOVABLE_ZONE and | |
8213 | * that the movable zone guarantees that pages are migratable but | |
8214 | * the later is not the case right now unfortunatelly. E.g. movablecore | |
8215 | * can still lead to having bootmem allocations in zone_movable. | |
49ac8255 | 8216 | */ |
49ac8255 | 8217 | |
1a9f2191 QC |
8218 | if (is_migrate_cma_page(page)) { |
8219 | /* | |
8220 | * CMA allocations (alloc_contig_range) really need to mark | |
8221 | * isolate CMA pageblocks even when they are not movable in fact | |
8222 | * so consider them movable here. | |
8223 | */ | |
8224 | if (is_migrate_cma(migratetype)) | |
4a55c047 | 8225 | return NULL; |
1a9f2191 | 8226 | |
3d680bdf | 8227 | return page; |
1a9f2191 | 8228 | } |
4da2ce25 | 8229 | |
fe4c86c9 DH |
8230 | for (; iter < pageblock_nr_pages; iter++) { |
8231 | if (!pfn_valid_within(pfn + iter)) | |
49ac8255 | 8232 | continue; |
29723fcc | 8233 | |
fe4c86c9 | 8234 | page = pfn_to_page(pfn + iter); |
c8721bbb | 8235 | |
d7ab3672 | 8236 | if (PageReserved(page)) |
3d680bdf | 8237 | return page; |
d7ab3672 | 8238 | |
9d789999 MH |
8239 | /* |
8240 | * If the zone is movable and we have ruled out all reserved | |
8241 | * pages then it should be reasonably safe to assume the rest | |
8242 | * is movable. | |
8243 | */ | |
8244 | if (zone_idx(zone) == ZONE_MOVABLE) | |
8245 | continue; | |
8246 | ||
c8721bbb NH |
8247 | /* |
8248 | * Hugepages are not in LRU lists, but they're movable. | |
1da2f328 | 8249 | * THPs are on the LRU, but need to be counted as #small pages. |
8bb4e7a2 | 8250 | * We need not scan over tail pages because we don't |
c8721bbb NH |
8251 | * handle each tail page individually in migration. |
8252 | */ | |
1da2f328 | 8253 | if (PageHuge(page) || PageTransCompound(page)) { |
17e2e7d7 OS |
8254 | struct page *head = compound_head(page); |
8255 | unsigned int skip_pages; | |
464c7ffb | 8256 | |
1da2f328 RR |
8257 | if (PageHuge(page)) { |
8258 | if (!hugepage_migration_supported(page_hstate(head))) | |
8259 | return page; | |
8260 | } else if (!PageLRU(head) && !__PageMovable(head)) { | |
3d680bdf | 8261 | return page; |
1da2f328 | 8262 | } |
464c7ffb | 8263 | |
d8c6546b | 8264 | skip_pages = compound_nr(head) - (page - head); |
17e2e7d7 | 8265 | iter += skip_pages - 1; |
c8721bbb NH |
8266 | continue; |
8267 | } | |
8268 | ||
97d255c8 MK |
8269 | /* |
8270 | * We can't use page_count without pin a page | |
8271 | * because another CPU can free compound page. | |
8272 | * This check already skips compound tails of THP | |
0139aa7b | 8273 | * because their page->_refcount is zero at all time. |
97d255c8 | 8274 | */ |
fe896d18 | 8275 | if (!page_ref_count(page)) { |
49ac8255 KH |
8276 | if (PageBuddy(page)) |
8277 | iter += (1 << page_order(page)) - 1; | |
8278 | continue; | |
8279 | } | |
97d255c8 | 8280 | |
b023f468 WC |
8281 | /* |
8282 | * The HWPoisoned page may be not in buddy system, and | |
8283 | * page_count() is not 0. | |
8284 | */ | |
756d25be | 8285 | if ((flags & MEMORY_OFFLINE) && PageHWPoison(page)) |
b023f468 WC |
8286 | continue; |
8287 | ||
aa218795 DH |
8288 | /* |
8289 | * We treat all PageOffline() pages as movable when offlining | |
8290 | * to give drivers a chance to decrement their reference count | |
8291 | * in MEM_GOING_OFFLINE in order to indicate that these pages | |
8292 | * can be offlined as there are no direct references anymore. | |
8293 | * For actually unmovable PageOffline() where the driver does | |
8294 | * not support this, we will fail later when trying to actually | |
8295 | * move these pages that still have a reference count > 0. | |
8296 | * (false negatives in this function only) | |
8297 | */ | |
8298 | if ((flags & MEMORY_OFFLINE) && PageOffline(page)) | |
8299 | continue; | |
8300 | ||
fe4c86c9 | 8301 | if (__PageMovable(page) || PageLRU(page)) |
0efadf48 YX |
8302 | continue; |
8303 | ||
49ac8255 | 8304 | /* |
6b4f7799 JW |
8305 | * If there are RECLAIMABLE pages, we need to check |
8306 | * it. But now, memory offline itself doesn't call | |
8307 | * shrink_node_slabs() and it still to be fixed. | |
49ac8255 KH |
8308 | */ |
8309 | /* | |
8310 | * If the page is not RAM, page_count()should be 0. | |
8311 | * we don't need more check. This is an _used_ not-movable page. | |
8312 | * | |
8313 | * The problematic thing here is PG_reserved pages. PG_reserved | |
8314 | * is set to both of a memory hole page and a _used_ kernel | |
8315 | * page at boot. | |
8316 | */ | |
3d680bdf | 8317 | return page; |
49ac8255 | 8318 | } |
4a55c047 | 8319 | return NULL; |
49ac8255 KH |
8320 | } |
8321 | ||
8df995f6 | 8322 | #ifdef CONFIG_CONTIG_ALLOC |
041d3a8c MN |
8323 | static unsigned long pfn_max_align_down(unsigned long pfn) |
8324 | { | |
8325 | return pfn & ~(max_t(unsigned long, MAX_ORDER_NR_PAGES, | |
8326 | pageblock_nr_pages) - 1); | |
8327 | } | |
8328 | ||
8329 | static unsigned long pfn_max_align_up(unsigned long pfn) | |
8330 | { | |
8331 | return ALIGN(pfn, max_t(unsigned long, MAX_ORDER_NR_PAGES, | |
8332 | pageblock_nr_pages)); | |
8333 | } | |
8334 | ||
041d3a8c | 8335 | /* [start, end) must belong to a single zone. */ |
bb13ffeb MG |
8336 | static int __alloc_contig_migrate_range(struct compact_control *cc, |
8337 | unsigned long start, unsigned long end) | |
041d3a8c MN |
8338 | { |
8339 | /* This function is based on compact_zone() from compaction.c. */ | |
730ec8c0 | 8340 | unsigned int nr_reclaimed; |
041d3a8c MN |
8341 | unsigned long pfn = start; |
8342 | unsigned int tries = 0; | |
8343 | int ret = 0; | |
8344 | ||
be49a6e1 | 8345 | migrate_prep(); |
041d3a8c | 8346 | |
bb13ffeb | 8347 | while (pfn < end || !list_empty(&cc->migratepages)) { |
041d3a8c MN |
8348 | if (fatal_signal_pending(current)) { |
8349 | ret = -EINTR; | |
8350 | break; | |
8351 | } | |
8352 | ||
bb13ffeb MG |
8353 | if (list_empty(&cc->migratepages)) { |
8354 | cc->nr_migratepages = 0; | |
edc2ca61 | 8355 | pfn = isolate_migratepages_range(cc, pfn, end); |
041d3a8c MN |
8356 | if (!pfn) { |
8357 | ret = -EINTR; | |
8358 | break; | |
8359 | } | |
8360 | tries = 0; | |
8361 | } else if (++tries == 5) { | |
8362 | ret = ret < 0 ? ret : -EBUSY; | |
8363 | break; | |
8364 | } | |
8365 | ||
beb51eaa MK |
8366 | nr_reclaimed = reclaim_clean_pages_from_list(cc->zone, |
8367 | &cc->migratepages); | |
8368 | cc->nr_migratepages -= nr_reclaimed; | |
02c6de8d | 8369 | |
9c620e2b | 8370 | ret = migrate_pages(&cc->migratepages, alloc_migrate_target, |
31025351 | 8371 | NULL, 0, cc->mode, MR_CONTIG_RANGE); |
041d3a8c | 8372 | } |
2a6f5124 SP |
8373 | if (ret < 0) { |
8374 | putback_movable_pages(&cc->migratepages); | |
8375 | return ret; | |
8376 | } | |
8377 | return 0; | |
041d3a8c MN |
8378 | } |
8379 | ||
8380 | /** | |
8381 | * alloc_contig_range() -- tries to allocate given range of pages | |
8382 | * @start: start PFN to allocate | |
8383 | * @end: one-past-the-last PFN to allocate | |
0815f3d8 MN |
8384 | * @migratetype: migratetype of the underlaying pageblocks (either |
8385 | * #MIGRATE_MOVABLE or #MIGRATE_CMA). All pageblocks | |
8386 | * in range must have the same migratetype and it must | |
8387 | * be either of the two. | |
ca96b625 | 8388 | * @gfp_mask: GFP mask to use during compaction |
041d3a8c MN |
8389 | * |
8390 | * The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES | |
2c7452a0 | 8391 | * aligned. The PFN range must belong to a single zone. |
041d3a8c | 8392 | * |
2c7452a0 MK |
8393 | * The first thing this routine does is attempt to MIGRATE_ISOLATE all |
8394 | * pageblocks in the range. Once isolated, the pageblocks should not | |
8395 | * be modified by others. | |
041d3a8c | 8396 | * |
a862f68a | 8397 | * Return: zero on success or negative error code. On success all |
041d3a8c MN |
8398 | * pages which PFN is in [start, end) are allocated for the caller and |
8399 | * need to be freed with free_contig_range(). | |
8400 | */ | |
0815f3d8 | 8401 | int alloc_contig_range(unsigned long start, unsigned long end, |
ca96b625 | 8402 | unsigned migratetype, gfp_t gfp_mask) |
041d3a8c | 8403 | { |
041d3a8c | 8404 | unsigned long outer_start, outer_end; |
d00181b9 KS |
8405 | unsigned int order; |
8406 | int ret = 0; | |
041d3a8c | 8407 | |
bb13ffeb MG |
8408 | struct compact_control cc = { |
8409 | .nr_migratepages = 0, | |
8410 | .order = -1, | |
8411 | .zone = page_zone(pfn_to_page(start)), | |
e0b9daeb | 8412 | .mode = MIGRATE_SYNC, |
bb13ffeb | 8413 | .ignore_skip_hint = true, |
2583d671 | 8414 | .no_set_skip_hint = true, |
7dea19f9 | 8415 | .gfp_mask = current_gfp_context(gfp_mask), |
b06eda09 | 8416 | .alloc_contig = true, |
bb13ffeb MG |
8417 | }; |
8418 | INIT_LIST_HEAD(&cc.migratepages); | |
8419 | ||
041d3a8c MN |
8420 | /* |
8421 | * What we do here is we mark all pageblocks in range as | |
8422 | * MIGRATE_ISOLATE. Because pageblock and max order pages may | |
8423 | * have different sizes, and due to the way page allocator | |
8424 | * work, we align the range to biggest of the two pages so | |
8425 | * that page allocator won't try to merge buddies from | |
8426 | * different pageblocks and change MIGRATE_ISOLATE to some | |
8427 | * other migration type. | |
8428 | * | |
8429 | * Once the pageblocks are marked as MIGRATE_ISOLATE, we | |
8430 | * migrate the pages from an unaligned range (ie. pages that | |
8431 | * we are interested in). This will put all the pages in | |
8432 | * range back to page allocator as MIGRATE_ISOLATE. | |
8433 | * | |
8434 | * When this is done, we take the pages in range from page | |
8435 | * allocator removing them from the buddy system. This way | |
8436 | * page allocator will never consider using them. | |
8437 | * | |
8438 | * This lets us mark the pageblocks back as | |
8439 | * MIGRATE_CMA/MIGRATE_MOVABLE so that free pages in the | |
8440 | * aligned range but not in the unaligned, original range are | |
8441 | * put back to page allocator so that buddy can use them. | |
8442 | */ | |
8443 | ||
8444 | ret = start_isolate_page_range(pfn_max_align_down(start), | |
d381c547 | 8445 | pfn_max_align_up(end), migratetype, 0); |
9b7ea46a | 8446 | if (ret < 0) |
86a595f9 | 8447 | return ret; |
041d3a8c | 8448 | |
8ef5849f JK |
8449 | /* |
8450 | * In case of -EBUSY, we'd like to know which page causes problem. | |
63cd4489 MK |
8451 | * So, just fall through. test_pages_isolated() has a tracepoint |
8452 | * which will report the busy page. | |
8453 | * | |
8454 | * It is possible that busy pages could become available before | |
8455 | * the call to test_pages_isolated, and the range will actually be | |
8456 | * allocated. So, if we fall through be sure to clear ret so that | |
8457 | * -EBUSY is not accidentally used or returned to caller. | |
8ef5849f | 8458 | */ |
bb13ffeb | 8459 | ret = __alloc_contig_migrate_range(&cc, start, end); |
8ef5849f | 8460 | if (ret && ret != -EBUSY) |
041d3a8c | 8461 | goto done; |
63cd4489 | 8462 | ret =0; |
041d3a8c MN |
8463 | |
8464 | /* | |
8465 | * Pages from [start, end) are within a MAX_ORDER_NR_PAGES | |
8466 | * aligned blocks that are marked as MIGRATE_ISOLATE. What's | |
8467 | * more, all pages in [start, end) are free in page allocator. | |
8468 | * What we are going to do is to allocate all pages from | |
8469 | * [start, end) (that is remove them from page allocator). | |
8470 | * | |
8471 | * The only problem is that pages at the beginning and at the | |
8472 | * end of interesting range may be not aligned with pages that | |
8473 | * page allocator holds, ie. they can be part of higher order | |
8474 | * pages. Because of this, we reserve the bigger range and | |
8475 | * once this is done free the pages we are not interested in. | |
8476 | * | |
8477 | * We don't have to hold zone->lock here because the pages are | |
8478 | * isolated thus they won't get removed from buddy. | |
8479 | */ | |
8480 | ||
8481 | lru_add_drain_all(); | |
041d3a8c MN |
8482 | |
8483 | order = 0; | |
8484 | outer_start = start; | |
8485 | while (!PageBuddy(pfn_to_page(outer_start))) { | |
8486 | if (++order >= MAX_ORDER) { | |
8ef5849f JK |
8487 | outer_start = start; |
8488 | break; | |
041d3a8c MN |
8489 | } |
8490 | outer_start &= ~0UL << order; | |
8491 | } | |
8492 | ||
8ef5849f JK |
8493 | if (outer_start != start) { |
8494 | order = page_order(pfn_to_page(outer_start)); | |
8495 | ||
8496 | /* | |
8497 | * outer_start page could be small order buddy page and | |
8498 | * it doesn't include start page. Adjust outer_start | |
8499 | * in this case to report failed page properly | |
8500 | * on tracepoint in test_pages_isolated() | |
8501 | */ | |
8502 | if (outer_start + (1UL << order) <= start) | |
8503 | outer_start = start; | |
8504 | } | |
8505 | ||
041d3a8c | 8506 | /* Make sure the range is really isolated. */ |
756d25be | 8507 | if (test_pages_isolated(outer_start, end, 0)) { |
75dddef3 | 8508 | pr_info_ratelimited("%s: [%lx, %lx) PFNs busy\n", |
dae803e1 | 8509 | __func__, outer_start, end); |
041d3a8c MN |
8510 | ret = -EBUSY; |
8511 | goto done; | |
8512 | } | |
8513 | ||
49f223a9 | 8514 | /* Grab isolated pages from freelists. */ |
bb13ffeb | 8515 | outer_end = isolate_freepages_range(&cc, outer_start, end); |
041d3a8c MN |
8516 | if (!outer_end) { |
8517 | ret = -EBUSY; | |
8518 | goto done; | |
8519 | } | |
8520 | ||
8521 | /* Free head and tail (if any) */ | |
8522 | if (start != outer_start) | |
8523 | free_contig_range(outer_start, start - outer_start); | |
8524 | if (end != outer_end) | |
8525 | free_contig_range(end, outer_end - end); | |
8526 | ||
8527 | done: | |
8528 | undo_isolate_page_range(pfn_max_align_down(start), | |
0815f3d8 | 8529 | pfn_max_align_up(end), migratetype); |
041d3a8c MN |
8530 | return ret; |
8531 | } | |
255f5985 | 8532 | EXPORT_SYMBOL(alloc_contig_range); |
5e27a2df AK |
8533 | |
8534 | static int __alloc_contig_pages(unsigned long start_pfn, | |
8535 | unsigned long nr_pages, gfp_t gfp_mask) | |
8536 | { | |
8537 | unsigned long end_pfn = start_pfn + nr_pages; | |
8538 | ||
8539 | return alloc_contig_range(start_pfn, end_pfn, MIGRATE_MOVABLE, | |
8540 | gfp_mask); | |
8541 | } | |
8542 | ||
8543 | static bool pfn_range_valid_contig(struct zone *z, unsigned long start_pfn, | |
8544 | unsigned long nr_pages) | |
8545 | { | |
8546 | unsigned long i, end_pfn = start_pfn + nr_pages; | |
8547 | struct page *page; | |
8548 | ||
8549 | for (i = start_pfn; i < end_pfn; i++) { | |
8550 | page = pfn_to_online_page(i); | |
8551 | if (!page) | |
8552 | return false; | |
8553 | ||
8554 | if (page_zone(page) != z) | |
8555 | return false; | |
8556 | ||
8557 | if (PageReserved(page)) | |
8558 | return false; | |
8559 | ||
8560 | if (page_count(page) > 0) | |
8561 | return false; | |
8562 | ||
8563 | if (PageHuge(page)) | |
8564 | return false; | |
8565 | } | |
8566 | return true; | |
8567 | } | |
8568 | ||
8569 | static bool zone_spans_last_pfn(const struct zone *zone, | |
8570 | unsigned long start_pfn, unsigned long nr_pages) | |
8571 | { | |
8572 | unsigned long last_pfn = start_pfn + nr_pages - 1; | |
8573 | ||
8574 | return zone_spans_pfn(zone, last_pfn); | |
8575 | } | |
8576 | ||
8577 | /** | |
8578 | * alloc_contig_pages() -- tries to find and allocate contiguous range of pages | |
8579 | * @nr_pages: Number of contiguous pages to allocate | |
8580 | * @gfp_mask: GFP mask to limit search and used during compaction | |
8581 | * @nid: Target node | |
8582 | * @nodemask: Mask for other possible nodes | |
8583 | * | |
8584 | * This routine is a wrapper around alloc_contig_range(). It scans over zones | |
8585 | * on an applicable zonelist to find a contiguous pfn range which can then be | |
8586 | * tried for allocation with alloc_contig_range(). This routine is intended | |
8587 | * for allocation requests which can not be fulfilled with the buddy allocator. | |
8588 | * | |
8589 | * The allocated memory is always aligned to a page boundary. If nr_pages is a | |
8590 | * power of two then the alignment is guaranteed to be to the given nr_pages | |
8591 | * (e.g. 1GB request would be aligned to 1GB). | |
8592 | * | |
8593 | * Allocated pages can be freed with free_contig_range() or by manually calling | |
8594 | * __free_page() on each allocated page. | |
8595 | * | |
8596 | * Return: pointer to contiguous pages on success, or NULL if not successful. | |
8597 | */ | |
8598 | struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask, | |
8599 | int nid, nodemask_t *nodemask) | |
8600 | { | |
8601 | unsigned long ret, pfn, flags; | |
8602 | struct zonelist *zonelist; | |
8603 | struct zone *zone; | |
8604 | struct zoneref *z; | |
8605 | ||
8606 | zonelist = node_zonelist(nid, gfp_mask); | |
8607 | for_each_zone_zonelist_nodemask(zone, z, zonelist, | |
8608 | gfp_zone(gfp_mask), nodemask) { | |
8609 | spin_lock_irqsave(&zone->lock, flags); | |
8610 | ||
8611 | pfn = ALIGN(zone->zone_start_pfn, nr_pages); | |
8612 | while (zone_spans_last_pfn(zone, pfn, nr_pages)) { | |
8613 | if (pfn_range_valid_contig(zone, pfn, nr_pages)) { | |
8614 | /* | |
8615 | * We release the zone lock here because | |
8616 | * alloc_contig_range() will also lock the zone | |
8617 | * at some point. If there's an allocation | |
8618 | * spinning on this lock, it may win the race | |
8619 | * and cause alloc_contig_range() to fail... | |
8620 | */ | |
8621 | spin_unlock_irqrestore(&zone->lock, flags); | |
8622 | ret = __alloc_contig_pages(pfn, nr_pages, | |
8623 | gfp_mask); | |
8624 | if (!ret) | |
8625 | return pfn_to_page(pfn); | |
8626 | spin_lock_irqsave(&zone->lock, flags); | |
8627 | } | |
8628 | pfn += nr_pages; | |
8629 | } | |
8630 | spin_unlock_irqrestore(&zone->lock, flags); | |
8631 | } | |
8632 | return NULL; | |
8633 | } | |
4eb0716e | 8634 | #endif /* CONFIG_CONTIG_ALLOC */ |
041d3a8c | 8635 | |
4eb0716e | 8636 | void free_contig_range(unsigned long pfn, unsigned int nr_pages) |
041d3a8c | 8637 | { |
bcc2b02f MS |
8638 | unsigned int count = 0; |
8639 | ||
8640 | for (; nr_pages--; pfn++) { | |
8641 | struct page *page = pfn_to_page(pfn); | |
8642 | ||
8643 | count += page_count(page) != 1; | |
8644 | __free_page(page); | |
8645 | } | |
8646 | WARN(count != 0, "%d pages are still in use!\n", count); | |
041d3a8c | 8647 | } |
255f5985 | 8648 | EXPORT_SYMBOL(free_contig_range); |
041d3a8c | 8649 | |
0a647f38 CS |
8650 | /* |
8651 | * The zone indicated has a new number of managed_pages; batch sizes and percpu | |
8652 | * page high values need to be recalulated. | |
8653 | */ | |
4ed7e022 JL |
8654 | void __meminit zone_pcp_update(struct zone *zone) |
8655 | { | |
c8e251fa | 8656 | mutex_lock(&pcp_batch_high_lock); |
cb1ef534 | 8657 | __zone_pcp_update(zone); |
c8e251fa | 8658 | mutex_unlock(&pcp_batch_high_lock); |
4ed7e022 | 8659 | } |
4ed7e022 | 8660 | |
340175b7 JL |
8661 | void zone_pcp_reset(struct zone *zone) |
8662 | { | |
8663 | unsigned long flags; | |
5a883813 MK |
8664 | int cpu; |
8665 | struct per_cpu_pageset *pset; | |
340175b7 JL |
8666 | |
8667 | /* avoid races with drain_pages() */ | |
8668 | local_irq_save(flags); | |
8669 | if (zone->pageset != &boot_pageset) { | |
5a883813 MK |
8670 | for_each_online_cpu(cpu) { |
8671 | pset = per_cpu_ptr(zone->pageset, cpu); | |
8672 | drain_zonestat(zone, pset); | |
8673 | } | |
340175b7 JL |
8674 | free_percpu(zone->pageset); |
8675 | zone->pageset = &boot_pageset; | |
8676 | } | |
8677 | local_irq_restore(flags); | |
8678 | } | |
8679 | ||
6dcd73d7 | 8680 | #ifdef CONFIG_MEMORY_HOTREMOVE |
0c0e6195 | 8681 | /* |
b9eb6319 JK |
8682 | * All pages in the range must be in a single zone and isolated |
8683 | * before calling this. | |
0c0e6195 | 8684 | */ |
5557c766 | 8685 | unsigned long |
0c0e6195 KH |
8686 | __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) |
8687 | { | |
8688 | struct page *page; | |
8689 | struct zone *zone; | |
0ee5f4f3 | 8690 | unsigned int order; |
0c0e6195 KH |
8691 | unsigned long pfn; |
8692 | unsigned long flags; | |
5557c766 MH |
8693 | unsigned long offlined_pages = 0; |
8694 | ||
0c0e6195 KH |
8695 | /* find the first valid pfn */ |
8696 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
8697 | if (pfn_valid(pfn)) | |
8698 | break; | |
8699 | if (pfn == end_pfn) | |
5557c766 MH |
8700 | return offlined_pages; |
8701 | ||
2d070eab | 8702 | offline_mem_sections(pfn, end_pfn); |
0c0e6195 KH |
8703 | zone = page_zone(pfn_to_page(pfn)); |
8704 | spin_lock_irqsave(&zone->lock, flags); | |
8705 | pfn = start_pfn; | |
8706 | while (pfn < end_pfn) { | |
8707 | if (!pfn_valid(pfn)) { | |
8708 | pfn++; | |
8709 | continue; | |
8710 | } | |
8711 | page = pfn_to_page(pfn); | |
b023f468 WC |
8712 | /* |
8713 | * The HWPoisoned page may be not in buddy system, and | |
8714 | * page_count() is not 0. | |
8715 | */ | |
8716 | if (unlikely(!PageBuddy(page) && PageHWPoison(page))) { | |
8717 | pfn++; | |
5557c766 | 8718 | offlined_pages++; |
b023f468 WC |
8719 | continue; |
8720 | } | |
aa218795 DH |
8721 | /* |
8722 | * At this point all remaining PageOffline() pages have a | |
8723 | * reference count of 0 and can simply be skipped. | |
8724 | */ | |
8725 | if (PageOffline(page)) { | |
8726 | BUG_ON(page_count(page)); | |
8727 | BUG_ON(PageBuddy(page)); | |
8728 | pfn++; | |
8729 | offlined_pages++; | |
8730 | continue; | |
8731 | } | |
b023f468 | 8732 | |
0c0e6195 KH |
8733 | BUG_ON(page_count(page)); |
8734 | BUG_ON(!PageBuddy(page)); | |
8735 | order = page_order(page); | |
5557c766 | 8736 | offlined_pages += 1 << order; |
6ab01363 | 8737 | del_page_from_free_list(page, zone, order); |
0c0e6195 KH |
8738 | pfn += (1 << order); |
8739 | } | |
8740 | spin_unlock_irqrestore(&zone->lock, flags); | |
5557c766 MH |
8741 | |
8742 | return offlined_pages; | |
0c0e6195 KH |
8743 | } |
8744 | #endif | |
8d22ba1b | 8745 | |
8d22ba1b WF |
8746 | bool is_free_buddy_page(struct page *page) |
8747 | { | |
8748 | struct zone *zone = page_zone(page); | |
8749 | unsigned long pfn = page_to_pfn(page); | |
8750 | unsigned long flags; | |
7aeb09f9 | 8751 | unsigned int order; |
8d22ba1b WF |
8752 | |
8753 | spin_lock_irqsave(&zone->lock, flags); | |
8754 | for (order = 0; order < MAX_ORDER; order++) { | |
8755 | struct page *page_head = page - (pfn & ((1 << order) - 1)); | |
8756 | ||
8757 | if (PageBuddy(page_head) && page_order(page_head) >= order) | |
8758 | break; | |
8759 | } | |
8760 | spin_unlock_irqrestore(&zone->lock, flags); | |
8761 | ||
8762 | return order < MAX_ORDER; | |
8763 | } | |
d4ae9916 NH |
8764 | |
8765 | #ifdef CONFIG_MEMORY_FAILURE | |
8766 | /* | |
8767 | * Set PG_hwpoison flag if a given page is confirmed to be a free page. This | |
8768 | * test is performed under the zone lock to prevent a race against page | |
8769 | * allocation. | |
8770 | */ | |
8771 | bool set_hwpoison_free_buddy_page(struct page *page) | |
8772 | { | |
8773 | struct zone *zone = page_zone(page); | |
8774 | unsigned long pfn = page_to_pfn(page); | |
8775 | unsigned long flags; | |
8776 | unsigned int order; | |
8777 | bool hwpoisoned = false; | |
8778 | ||
8779 | spin_lock_irqsave(&zone->lock, flags); | |
8780 | for (order = 0; order < MAX_ORDER; order++) { | |
8781 | struct page *page_head = page - (pfn & ((1 << order) - 1)); | |
8782 | ||
8783 | if (PageBuddy(page_head) && page_order(page_head) >= order) { | |
8784 | if (!TestSetPageHWPoison(page)) | |
8785 | hwpoisoned = true; | |
8786 | break; | |
8787 | } | |
8788 | } | |
8789 | spin_unlock_irqrestore(&zone->lock, flags); | |
8790 | ||
8791 | return hwpoisoned; | |
8792 | } | |
8793 | #endif |