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1da177e4 LT |
1 | #ifndef _LINUX_MMZONE_H |
2 | #define _LINUX_MMZONE_H | |
3 | ||
4 | #ifdef __KERNEL__ | |
5 | #ifndef __ASSEMBLY__ | |
6 | ||
1da177e4 LT |
7 | #include <linux/spinlock.h> |
8 | #include <linux/list.h> | |
9 | #include <linux/wait.h> | |
10 | #include <linux/cache.h> | |
11 | #include <linux/threads.h> | |
12 | #include <linux/numa.h> | |
13 | #include <linux/init.h> | |
bdc8cb98 | 14 | #include <linux/seqlock.h> |
8357f869 | 15 | #include <linux/nodemask.h> |
835c134e | 16 | #include <linux/pageblock-flags.h> |
1da177e4 | 17 | #include <asm/atomic.h> |
93ff66bf | 18 | #include <asm/page.h> |
1da177e4 LT |
19 | |
20 | /* Free memory management - zoned buddy allocator. */ | |
21 | #ifndef CONFIG_FORCE_MAX_ZONEORDER | |
22 | #define MAX_ORDER 11 | |
23 | #else | |
24 | #define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER | |
25 | #endif | |
e984bb43 | 26 | #define MAX_ORDER_NR_PAGES (1 << (MAX_ORDER - 1)) |
1da177e4 | 27 | |
5ad333eb AW |
28 | /* |
29 | * PAGE_ALLOC_COSTLY_ORDER is the order at which allocations are deemed | |
30 | * costly to service. That is between allocation orders which should | |
31 | * coelesce naturally under reasonable reclaim pressure and those which | |
32 | * will not. | |
33 | */ | |
34 | #define PAGE_ALLOC_COSTLY_ORDER 3 | |
35 | ||
b2a0ac88 | 36 | #define MIGRATE_UNMOVABLE 0 |
e12ba74d MG |
37 | #define MIGRATE_RECLAIMABLE 1 |
38 | #define MIGRATE_MOVABLE 2 | |
64c5e135 MG |
39 | #define MIGRATE_RESERVE 3 |
40 | #define MIGRATE_TYPES 4 | |
b2a0ac88 MG |
41 | |
42 | #define for_each_migratetype_order(order, type) \ | |
43 | for (order = 0; order < MAX_ORDER; order++) \ | |
44 | for (type = 0; type < MIGRATE_TYPES; type++) | |
45 | ||
1da177e4 | 46 | struct free_area { |
b2a0ac88 | 47 | struct list_head free_list[MIGRATE_TYPES]; |
1da177e4 LT |
48 | unsigned long nr_free; |
49 | }; | |
50 | ||
51 | struct pglist_data; | |
52 | ||
53 | /* | |
54 | * zone->lock and zone->lru_lock are two of the hottest locks in the kernel. | |
55 | * So add a wild amount of padding here to ensure that they fall into separate | |
56 | * cachelines. There are very few zone structures in the machine, so space | |
57 | * consumption is not a concern here. | |
58 | */ | |
59 | #if defined(CONFIG_SMP) | |
60 | struct zone_padding { | |
61 | char x[0]; | |
22fc6ecc | 62 | } ____cacheline_internodealigned_in_smp; |
1da177e4 LT |
63 | #define ZONE_PADDING(name) struct zone_padding name; |
64 | #else | |
65 | #define ZONE_PADDING(name) | |
66 | #endif | |
67 | ||
2244b95a | 68 | enum zone_stat_item { |
51ed4491 | 69 | /* First 128 byte cacheline (assuming 64 bit words) */ |
d23ad423 | 70 | NR_FREE_PAGES, |
c8785385 CL |
71 | NR_INACTIVE, |
72 | NR_ACTIVE, | |
f3dbd344 CL |
73 | NR_ANON_PAGES, /* Mapped anonymous pages */ |
74 | NR_FILE_MAPPED, /* pagecache pages mapped into pagetables. | |
65ba55f5 | 75 | only modified from process context */ |
347ce434 | 76 | NR_FILE_PAGES, |
b1e7a8fd | 77 | NR_FILE_DIRTY, |
ce866b34 | 78 | NR_WRITEBACK, |
51ed4491 CL |
79 | /* Second 128 byte cacheline */ |
80 | NR_SLAB_RECLAIMABLE, | |
81 | NR_SLAB_UNRECLAIMABLE, | |
82 | NR_PAGETABLE, /* used for pagetables */ | |
fd39fc85 | 83 | NR_UNSTABLE_NFS, /* NFS unstable pages */ |
d2c5e30c | 84 | NR_BOUNCE, |
e129b5c2 | 85 | NR_VMSCAN_WRITE, |
ca889e6c CL |
86 | #ifdef CONFIG_NUMA |
87 | NUMA_HIT, /* allocated in intended node */ | |
88 | NUMA_MISS, /* allocated in non intended node */ | |
89 | NUMA_FOREIGN, /* was intended here, hit elsewhere */ | |
90 | NUMA_INTERLEAVE_HIT, /* interleaver preferred this zone */ | |
91 | NUMA_LOCAL, /* allocation from local node */ | |
92 | NUMA_OTHER, /* allocation from other node */ | |
93 | #endif | |
2244b95a CL |
94 | NR_VM_ZONE_STAT_ITEMS }; |
95 | ||
1da177e4 LT |
96 | struct per_cpu_pages { |
97 | int count; /* number of pages in the list */ | |
1da177e4 LT |
98 | int high; /* high watermark, emptying needed */ |
99 | int batch; /* chunk size for buddy add/remove */ | |
100 | struct list_head list; /* the list of pages */ | |
101 | }; | |
102 | ||
103 | struct per_cpu_pageset { | |
104 | struct per_cpu_pages pcp[2]; /* 0: hot. 1: cold */ | |
4037d452 CL |
105 | #ifdef CONFIG_NUMA |
106 | s8 expire; | |
107 | #endif | |
2244b95a | 108 | #ifdef CONFIG_SMP |
df9ecaba | 109 | s8 stat_threshold; |
2244b95a CL |
110 | s8 vm_stat_diff[NR_VM_ZONE_STAT_ITEMS]; |
111 | #endif | |
1da177e4 LT |
112 | } ____cacheline_aligned_in_smp; |
113 | ||
e7c8d5c9 CL |
114 | #ifdef CONFIG_NUMA |
115 | #define zone_pcp(__z, __cpu) ((__z)->pageset[(__cpu)]) | |
116 | #else | |
117 | #define zone_pcp(__z, __cpu) (&(__z)->pageset[(__cpu)]) | |
118 | #endif | |
119 | ||
2f1b6248 | 120 | enum zone_type { |
4b51d669 | 121 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 CL |
122 | /* |
123 | * ZONE_DMA is used when there are devices that are not able | |
124 | * to do DMA to all of addressable memory (ZONE_NORMAL). Then we | |
125 | * carve out the portion of memory that is needed for these devices. | |
126 | * The range is arch specific. | |
127 | * | |
128 | * Some examples | |
129 | * | |
130 | * Architecture Limit | |
131 | * --------------------------- | |
132 | * parisc, ia64, sparc <4G | |
133 | * s390 <2G | |
2f1b6248 CL |
134 | * arm Various |
135 | * alpha Unlimited or 0-16MB. | |
136 | * | |
137 | * i386, x86_64 and multiple other arches | |
138 | * <16M. | |
139 | */ | |
140 | ZONE_DMA, | |
4b51d669 | 141 | #endif |
fb0e7942 | 142 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 CL |
143 | /* |
144 | * x86_64 needs two ZONE_DMAs because it supports devices that are | |
145 | * only able to do DMA to the lower 16M but also 32 bit devices that | |
146 | * can only do DMA areas below 4G. | |
147 | */ | |
148 | ZONE_DMA32, | |
fb0e7942 | 149 | #endif |
2f1b6248 CL |
150 | /* |
151 | * Normal addressable memory is in ZONE_NORMAL. DMA operations can be | |
152 | * performed on pages in ZONE_NORMAL if the DMA devices support | |
153 | * transfers to all addressable memory. | |
154 | */ | |
155 | ZONE_NORMAL, | |
e53ef38d | 156 | #ifdef CONFIG_HIGHMEM |
2f1b6248 CL |
157 | /* |
158 | * A memory area that is only addressable by the kernel through | |
159 | * mapping portions into its own address space. This is for example | |
160 | * used by i386 to allow the kernel to address the memory beyond | |
161 | * 900MB. The kernel will set up special mappings (page | |
162 | * table entries on i386) for each page that the kernel needs to | |
163 | * access. | |
164 | */ | |
165 | ZONE_HIGHMEM, | |
e53ef38d | 166 | #endif |
2a1e274a | 167 | ZONE_MOVABLE, |
2f1b6248 CL |
168 | MAX_NR_ZONES |
169 | }; | |
1da177e4 | 170 | |
1da177e4 LT |
171 | /* |
172 | * When a memory allocation must conform to specific limitations (such | |
173 | * as being suitable for DMA) the caller will pass in hints to the | |
174 | * allocator in the gfp_mask, in the zone modifier bits. These bits | |
175 | * are used to select a priority ordered list of memory zones which | |
19655d34 | 176 | * match the requested limits. See gfp_zone() in include/linux/gfp.h |
1da177e4 | 177 | */ |
fb0e7942 | 178 | |
4b51d669 CL |
179 | /* |
180 | * Count the active zones. Note that the use of defined(X) outside | |
181 | * #if and family is not necessarily defined so ensure we cannot use | |
182 | * it later. Use __ZONE_COUNT to work out how many shift bits we need. | |
183 | */ | |
184 | #define __ZONE_COUNT ( \ | |
185 | defined(CONFIG_ZONE_DMA) \ | |
186 | + defined(CONFIG_ZONE_DMA32) \ | |
187 | + 1 \ | |
188 | + defined(CONFIG_HIGHMEM) \ | |
2a1e274a | 189 | + 1 \ |
4b51d669 CL |
190 | ) |
191 | #if __ZONE_COUNT < 2 | |
192 | #define ZONES_SHIFT 0 | |
193 | #elif __ZONE_COUNT <= 2 | |
19655d34 | 194 | #define ZONES_SHIFT 1 |
4b51d669 | 195 | #elif __ZONE_COUNT <= 4 |
19655d34 | 196 | #define ZONES_SHIFT 2 |
4b51d669 CL |
197 | #else |
198 | #error ZONES_SHIFT -- too many zones configured adjust calculation | |
fb0e7942 | 199 | #endif |
4b51d669 | 200 | #undef __ZONE_COUNT |
1da177e4 | 201 | |
1da177e4 LT |
202 | struct zone { |
203 | /* Fields commonly accessed by the page allocator */ | |
1da177e4 LT |
204 | unsigned long pages_min, pages_low, pages_high; |
205 | /* | |
206 | * We don't know if the memory that we're going to allocate will be freeable | |
207 | * or/and it will be released eventually, so to avoid totally wasting several | |
208 | * GB of ram we must reserve some of the lower zone memory (otherwise we risk | |
209 | * to run OOM on the lower zones despite there's tons of freeable ram | |
210 | * on the higher zones). This array is recalculated at runtime if the | |
211 | * sysctl_lowmem_reserve_ratio sysctl changes. | |
212 | */ | |
213 | unsigned long lowmem_reserve[MAX_NR_ZONES]; | |
214 | ||
e7c8d5c9 | 215 | #ifdef CONFIG_NUMA |
d5f541ed | 216 | int node; |
9614634f CL |
217 | /* |
218 | * zone reclaim becomes active if more unmapped pages exist. | |
219 | */ | |
8417bba4 | 220 | unsigned long min_unmapped_pages; |
0ff38490 | 221 | unsigned long min_slab_pages; |
e7c8d5c9 CL |
222 | struct per_cpu_pageset *pageset[NR_CPUS]; |
223 | #else | |
1da177e4 | 224 | struct per_cpu_pageset pageset[NR_CPUS]; |
e7c8d5c9 | 225 | #endif |
1da177e4 LT |
226 | /* |
227 | * free areas of different sizes | |
228 | */ | |
229 | spinlock_t lock; | |
bdc8cb98 DH |
230 | #ifdef CONFIG_MEMORY_HOTPLUG |
231 | /* see spanned/present_pages for more description */ | |
232 | seqlock_t span_seqlock; | |
233 | #endif | |
1da177e4 LT |
234 | struct free_area free_area[MAX_ORDER]; |
235 | ||
835c134e MG |
236 | #ifndef CONFIG_SPARSEMEM |
237 | /* | |
d9c23400 | 238 | * Flags for a pageblock_nr_pages block. See pageblock-flags.h. |
835c134e MG |
239 | * In SPARSEMEM, this map is stored in struct mem_section |
240 | */ | |
241 | unsigned long *pageblock_flags; | |
242 | #endif /* CONFIG_SPARSEMEM */ | |
243 | ||
1da177e4 LT |
244 | |
245 | ZONE_PADDING(_pad1_) | |
246 | ||
247 | /* Fields commonly accessed by the page reclaim scanner */ | |
248 | spinlock_t lru_lock; | |
249 | struct list_head active_list; | |
250 | struct list_head inactive_list; | |
251 | unsigned long nr_scan_active; | |
252 | unsigned long nr_scan_inactive; | |
1da177e4 LT |
253 | unsigned long pages_scanned; /* since last reclaim */ |
254 | int all_unreclaimable; /* All pages pinned */ | |
255 | ||
1e7e5a90 MH |
256 | /* A count of how many reclaimers are scanning this zone */ |
257 | atomic_t reclaim_in_progress; | |
753ee728 | 258 | |
2244b95a CL |
259 | /* Zone statistics */ |
260 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
9eeff239 | 261 | |
1da177e4 LT |
262 | /* |
263 | * prev_priority holds the scanning priority for this zone. It is | |
264 | * defined as the scanning priority at which we achieved our reclaim | |
265 | * target at the previous try_to_free_pages() or balance_pgdat() | |
266 | * invokation. | |
267 | * | |
268 | * We use prev_priority as a measure of how much stress page reclaim is | |
269 | * under - it drives the swappiness decision: whether to unmap mapped | |
270 | * pages. | |
271 | * | |
3bb1a852 | 272 | * Access to both this field is quite racy even on uniprocessor. But |
1da177e4 LT |
273 | * it is expected to average out OK. |
274 | */ | |
1da177e4 LT |
275 | int prev_priority; |
276 | ||
277 | ||
278 | ZONE_PADDING(_pad2_) | |
279 | /* Rarely used or read-mostly fields */ | |
280 | ||
281 | /* | |
282 | * wait_table -- the array holding the hash table | |
02b694de | 283 | * wait_table_hash_nr_entries -- the size of the hash table array |
1da177e4 LT |
284 | * wait_table_bits -- wait_table_size == (1 << wait_table_bits) |
285 | * | |
286 | * The purpose of all these is to keep track of the people | |
287 | * waiting for a page to become available and make them | |
288 | * runnable again when possible. The trouble is that this | |
289 | * consumes a lot of space, especially when so few things | |
290 | * wait on pages at a given time. So instead of using | |
291 | * per-page waitqueues, we use a waitqueue hash table. | |
292 | * | |
293 | * The bucket discipline is to sleep on the same queue when | |
294 | * colliding and wake all in that wait queue when removing. | |
295 | * When something wakes, it must check to be sure its page is | |
296 | * truly available, a la thundering herd. The cost of a | |
297 | * collision is great, but given the expected load of the | |
298 | * table, they should be so rare as to be outweighed by the | |
299 | * benefits from the saved space. | |
300 | * | |
301 | * __wait_on_page_locked() and unlock_page() in mm/filemap.c, are the | |
302 | * primary users of these fields, and in mm/page_alloc.c | |
303 | * free_area_init_core() performs the initialization of them. | |
304 | */ | |
305 | wait_queue_head_t * wait_table; | |
02b694de | 306 | unsigned long wait_table_hash_nr_entries; |
1da177e4 LT |
307 | unsigned long wait_table_bits; |
308 | ||
309 | /* | |
310 | * Discontig memory support fields. | |
311 | */ | |
312 | struct pglist_data *zone_pgdat; | |
1da177e4 LT |
313 | /* zone_start_pfn == zone_start_paddr >> PAGE_SHIFT */ |
314 | unsigned long zone_start_pfn; | |
315 | ||
bdc8cb98 DH |
316 | /* |
317 | * zone_start_pfn, spanned_pages and present_pages are all | |
318 | * protected by span_seqlock. It is a seqlock because it has | |
319 | * to be read outside of zone->lock, and it is done in the main | |
320 | * allocator path. But, it is written quite infrequently. | |
321 | * | |
322 | * The lock is declared along with zone->lock because it is | |
323 | * frequently read in proximity to zone->lock. It's good to | |
324 | * give them a chance of being in the same cacheline. | |
325 | */ | |
1da177e4 LT |
326 | unsigned long spanned_pages; /* total size, including holes */ |
327 | unsigned long present_pages; /* amount of memory (excluding holes) */ | |
328 | ||
329 | /* | |
330 | * rarely used fields: | |
331 | */ | |
15ad7cdc | 332 | const char *name; |
22fc6ecc | 333 | } ____cacheline_internodealigned_in_smp; |
1da177e4 | 334 | |
1da177e4 LT |
335 | /* |
336 | * The "priority" of VM scanning is how much of the queues we will scan in one | |
337 | * go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the | |
338 | * queues ("queue_length >> 12") during an aging round. | |
339 | */ | |
340 | #define DEF_PRIORITY 12 | |
341 | ||
9276b1bc PJ |
342 | /* Maximum number of zones on a zonelist */ |
343 | #define MAX_ZONES_PER_ZONELIST (MAX_NUMNODES * MAX_NR_ZONES) | |
344 | ||
345 | #ifdef CONFIG_NUMA | |
523b9458 CL |
346 | |
347 | /* | |
348 | * The NUMA zonelists are doubled becausse we need zonelists that restrict the | |
349 | * allocations to a single node for GFP_THISNODE. | |
350 | * | |
351 | * [0 .. MAX_NR_ZONES -1] : Zonelists with fallback | |
352 | * [MAZ_NR_ZONES ... MAZ_ZONELISTS -1] : No fallback (GFP_THISNODE) | |
353 | */ | |
354 | #define MAX_ZONELISTS (2 * MAX_NR_ZONES) | |
355 | ||
356 | ||
9276b1bc PJ |
357 | /* |
358 | * We cache key information from each zonelist for smaller cache | |
359 | * footprint when scanning for free pages in get_page_from_freelist(). | |
360 | * | |
361 | * 1) The BITMAP fullzones tracks which zones in a zonelist have come | |
362 | * up short of free memory since the last time (last_fullzone_zap) | |
363 | * we zero'd fullzones. | |
364 | * 2) The array z_to_n[] maps each zone in the zonelist to its node | |
365 | * id, so that we can efficiently evaluate whether that node is | |
366 | * set in the current tasks mems_allowed. | |
367 | * | |
368 | * Both fullzones and z_to_n[] are one-to-one with the zonelist, | |
369 | * indexed by a zones offset in the zonelist zones[] array. | |
370 | * | |
371 | * The get_page_from_freelist() routine does two scans. During the | |
372 | * first scan, we skip zones whose corresponding bit in 'fullzones' | |
373 | * is set or whose corresponding node in current->mems_allowed (which | |
374 | * comes from cpusets) is not set. During the second scan, we bypass | |
375 | * this zonelist_cache, to ensure we look methodically at each zone. | |
376 | * | |
377 | * Once per second, we zero out (zap) fullzones, forcing us to | |
378 | * reconsider nodes that might have regained more free memory. | |
379 | * The field last_full_zap is the time we last zapped fullzones. | |
380 | * | |
381 | * This mechanism reduces the amount of time we waste repeatedly | |
382 | * reexaming zones for free memory when they just came up low on | |
383 | * memory momentarilly ago. | |
384 | * | |
385 | * The zonelist_cache struct members logically belong in struct | |
386 | * zonelist. However, the mempolicy zonelists constructed for | |
387 | * MPOL_BIND are intentionally variable length (and usually much | |
388 | * shorter). A general purpose mechanism for handling structs with | |
389 | * multiple variable length members is more mechanism than we want | |
390 | * here. We resort to some special case hackery instead. | |
391 | * | |
392 | * The MPOL_BIND zonelists don't need this zonelist_cache (in good | |
393 | * part because they are shorter), so we put the fixed length stuff | |
394 | * at the front of the zonelist struct, ending in a variable length | |
395 | * zones[], as is needed by MPOL_BIND. | |
396 | * | |
397 | * Then we put the optional zonelist cache on the end of the zonelist | |
398 | * struct. This optional stuff is found by a 'zlcache_ptr' pointer in | |
399 | * the fixed length portion at the front of the struct. This pointer | |
400 | * both enables us to find the zonelist cache, and in the case of | |
401 | * MPOL_BIND zonelists, (which will just set the zlcache_ptr to NULL) | |
402 | * to know that the zonelist cache is not there. | |
403 | * | |
404 | * The end result is that struct zonelists come in two flavors: | |
405 | * 1) The full, fixed length version, shown below, and | |
406 | * 2) The custom zonelists for MPOL_BIND. | |
407 | * The custom MPOL_BIND zonelists have a NULL zlcache_ptr and no zlcache. | |
408 | * | |
409 | * Even though there may be multiple CPU cores on a node modifying | |
410 | * fullzones or last_full_zap in the same zonelist_cache at the same | |
411 | * time, we don't lock it. This is just hint data - if it is wrong now | |
412 | * and then, the allocator will still function, perhaps a bit slower. | |
413 | */ | |
414 | ||
415 | ||
416 | struct zonelist_cache { | |
9276b1bc | 417 | unsigned short z_to_n[MAX_ZONES_PER_ZONELIST]; /* zone->nid */ |
7253f4ef | 418 | DECLARE_BITMAP(fullzones, MAX_ZONES_PER_ZONELIST); /* zone full? */ |
9276b1bc PJ |
419 | unsigned long last_full_zap; /* when last zap'd (jiffies) */ |
420 | }; | |
421 | #else | |
523b9458 | 422 | #define MAX_ZONELISTS MAX_NR_ZONES |
9276b1bc PJ |
423 | struct zonelist_cache; |
424 | #endif | |
425 | ||
1da177e4 LT |
426 | /* |
427 | * One allocation request operates on a zonelist. A zonelist | |
428 | * is a list of zones, the first one is the 'goal' of the | |
429 | * allocation, the other zones are fallback zones, in decreasing | |
430 | * priority. | |
431 | * | |
9276b1bc PJ |
432 | * If zlcache_ptr is not NULL, then it is just the address of zlcache, |
433 | * as explained above. If zlcache_ptr is NULL, there is no zlcache. | |
1da177e4 | 434 | */ |
9276b1bc | 435 | |
1da177e4 | 436 | struct zonelist { |
9276b1bc PJ |
437 | struct zonelist_cache *zlcache_ptr; // NULL or &zlcache |
438 | struct zone *zones[MAX_ZONES_PER_ZONELIST + 1]; // NULL delimited | |
439 | #ifdef CONFIG_NUMA | |
440 | struct zonelist_cache zlcache; // optional ... | |
441 | #endif | |
1da177e4 LT |
442 | }; |
443 | ||
b377fd39 MG |
444 | #ifdef CONFIG_NUMA |
445 | /* | |
446 | * Only custom zonelists like MPOL_BIND need to be filtered as part of | |
447 | * policies. As described in the comment for struct zonelist_cache, these | |
448 | * zonelists will not have a zlcache so zlcache_ptr will not be set. Use | |
449 | * that to determine if the zonelists needs to be filtered or not. | |
450 | */ | |
451 | static inline int alloc_should_filter_zonelist(struct zonelist *zonelist) | |
452 | { | |
453 | return !zonelist->zlcache_ptr; | |
454 | } | |
455 | #else | |
456 | static inline int alloc_should_filter_zonelist(struct zonelist *zonelist) | |
457 | { | |
458 | return 0; | |
459 | } | |
460 | #endif /* CONFIG_NUMA */ | |
461 | ||
c713216d MG |
462 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
463 | struct node_active_region { | |
464 | unsigned long start_pfn; | |
465 | unsigned long end_pfn; | |
466 | int nid; | |
467 | }; | |
468 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ | |
1da177e4 | 469 | |
5b99cd0e HC |
470 | #ifndef CONFIG_DISCONTIGMEM |
471 | /* The array of struct pages - for discontigmem use pgdat->lmem_map */ | |
472 | extern struct page *mem_map; | |
473 | #endif | |
474 | ||
1da177e4 LT |
475 | /* |
476 | * The pg_data_t structure is used in machines with CONFIG_DISCONTIGMEM | |
477 | * (mostly NUMA machines?) to denote a higher-level memory zone than the | |
478 | * zone denotes. | |
479 | * | |
480 | * On NUMA machines, each NUMA node would have a pg_data_t to describe | |
481 | * it's memory layout. | |
482 | * | |
483 | * Memory statistics and page replacement data structures are maintained on a | |
484 | * per-zone basis. | |
485 | */ | |
486 | struct bootmem_data; | |
487 | typedef struct pglist_data { | |
488 | struct zone node_zones[MAX_NR_ZONES]; | |
523b9458 | 489 | struct zonelist node_zonelists[MAX_ZONELISTS]; |
1da177e4 | 490 | int nr_zones; |
d41dee36 | 491 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
1da177e4 | 492 | struct page *node_mem_map; |
d41dee36 | 493 | #endif |
1da177e4 | 494 | struct bootmem_data *bdata; |
208d54e5 DH |
495 | #ifdef CONFIG_MEMORY_HOTPLUG |
496 | /* | |
497 | * Must be held any time you expect node_start_pfn, node_present_pages | |
498 | * or node_spanned_pages stay constant. Holding this will also | |
499 | * guarantee that any pfn_valid() stays that way. | |
500 | * | |
501 | * Nests above zone->lock and zone->size_seqlock. | |
502 | */ | |
503 | spinlock_t node_size_lock; | |
504 | #endif | |
1da177e4 LT |
505 | unsigned long node_start_pfn; |
506 | unsigned long node_present_pages; /* total number of physical pages */ | |
507 | unsigned long node_spanned_pages; /* total size of physical page | |
508 | range, including holes */ | |
509 | int node_id; | |
1da177e4 LT |
510 | wait_queue_head_t kswapd_wait; |
511 | struct task_struct *kswapd; | |
512 | int kswapd_max_order; | |
513 | } pg_data_t; | |
514 | ||
515 | #define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages) | |
516 | #define node_spanned_pages(nid) (NODE_DATA(nid)->node_spanned_pages) | |
d41dee36 | 517 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
408fde81 | 518 | #define pgdat_page_nr(pgdat, pagenr) ((pgdat)->node_mem_map + (pagenr)) |
d41dee36 AW |
519 | #else |
520 | #define pgdat_page_nr(pgdat, pagenr) pfn_to_page((pgdat)->node_start_pfn + (pagenr)) | |
521 | #endif | |
408fde81 | 522 | #define nid_page_nr(nid, pagenr) pgdat_page_nr(NODE_DATA(nid),(pagenr)) |
1da177e4 | 523 | |
208d54e5 DH |
524 | #include <linux/memory_hotplug.h> |
525 | ||
1da177e4 LT |
526 | void get_zone_counts(unsigned long *active, unsigned long *inactive, |
527 | unsigned long *free); | |
528 | void build_all_zonelists(void); | |
529 | void wakeup_kswapd(struct zone *zone, int order); | |
530 | int zone_watermark_ok(struct zone *z, int order, unsigned long mark, | |
7fb1d9fc | 531 | int classzone_idx, int alloc_flags); |
a2f3aa02 DH |
532 | enum memmap_context { |
533 | MEMMAP_EARLY, | |
534 | MEMMAP_HOTPLUG, | |
535 | }; | |
718127cc | 536 | extern int init_currently_empty_zone(struct zone *zone, unsigned long start_pfn, |
a2f3aa02 DH |
537 | unsigned long size, |
538 | enum memmap_context context); | |
718127cc | 539 | |
1da177e4 LT |
540 | #ifdef CONFIG_HAVE_MEMORY_PRESENT |
541 | void memory_present(int nid, unsigned long start, unsigned long end); | |
542 | #else | |
543 | static inline void memory_present(int nid, unsigned long start, unsigned long end) {} | |
544 | #endif | |
545 | ||
546 | #ifdef CONFIG_NEED_NODE_MEMMAP_SIZE | |
547 | unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long); | |
548 | #endif | |
549 | ||
550 | /* | |
551 | * zone_idx() returns 0 for the ZONE_DMA zone, 1 for the ZONE_NORMAL zone, etc. | |
552 | */ | |
553 | #define zone_idx(zone) ((zone) - (zone)->zone_pgdat->node_zones) | |
554 | ||
f3fe6512 CK |
555 | static inline int populated_zone(struct zone *zone) |
556 | { | |
557 | return (!!zone->present_pages); | |
558 | } | |
559 | ||
2a1e274a MG |
560 | extern int movable_zone; |
561 | ||
562 | static inline int zone_movable_is_highmem(void) | |
563 | { | |
564 | #if defined(CONFIG_HIGHMEM) && defined(CONFIG_ARCH_POPULATES_NODE_MAP) | |
565 | return movable_zone == ZONE_HIGHMEM; | |
566 | #else | |
567 | return 0; | |
568 | #endif | |
569 | } | |
570 | ||
2f1b6248 | 571 | static inline int is_highmem_idx(enum zone_type idx) |
1da177e4 | 572 | { |
e53ef38d | 573 | #ifdef CONFIG_HIGHMEM |
2a1e274a MG |
574 | return (idx == ZONE_HIGHMEM || |
575 | (idx == ZONE_MOVABLE && zone_movable_is_highmem())); | |
e53ef38d CL |
576 | #else |
577 | return 0; | |
578 | #endif | |
1da177e4 LT |
579 | } |
580 | ||
2f1b6248 | 581 | static inline int is_normal_idx(enum zone_type idx) |
1da177e4 LT |
582 | { |
583 | return (idx == ZONE_NORMAL); | |
584 | } | |
9328b8fa | 585 | |
1da177e4 LT |
586 | /** |
587 | * is_highmem - helper function to quickly check if a struct zone is a | |
588 | * highmem zone or not. This is an attempt to keep references | |
589 | * to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum. | |
590 | * @zone - pointer to struct zone variable | |
591 | */ | |
592 | static inline int is_highmem(struct zone *zone) | |
593 | { | |
e53ef38d | 594 | #ifdef CONFIG_HIGHMEM |
2a1e274a MG |
595 | int zone_idx = zone - zone->zone_pgdat->node_zones; |
596 | return zone_idx == ZONE_HIGHMEM || | |
597 | (zone_idx == ZONE_MOVABLE && zone_movable_is_highmem()); | |
e53ef38d CL |
598 | #else |
599 | return 0; | |
600 | #endif | |
1da177e4 LT |
601 | } |
602 | ||
603 | static inline int is_normal(struct zone *zone) | |
604 | { | |
605 | return zone == zone->zone_pgdat->node_zones + ZONE_NORMAL; | |
606 | } | |
607 | ||
9328b8fa NP |
608 | static inline int is_dma32(struct zone *zone) |
609 | { | |
fb0e7942 | 610 | #ifdef CONFIG_ZONE_DMA32 |
9328b8fa | 611 | return zone == zone->zone_pgdat->node_zones + ZONE_DMA32; |
fb0e7942 CL |
612 | #else |
613 | return 0; | |
614 | #endif | |
9328b8fa NP |
615 | } |
616 | ||
617 | static inline int is_dma(struct zone *zone) | |
618 | { | |
4b51d669 | 619 | #ifdef CONFIG_ZONE_DMA |
9328b8fa | 620 | return zone == zone->zone_pgdat->node_zones + ZONE_DMA; |
4b51d669 CL |
621 | #else |
622 | return 0; | |
623 | #endif | |
9328b8fa NP |
624 | } |
625 | ||
1da177e4 LT |
626 | /* These two functions are used to setup the per zone pages min values */ |
627 | struct ctl_table; | |
628 | struct file; | |
629 | int min_free_kbytes_sysctl_handler(struct ctl_table *, int, struct file *, | |
630 | void __user *, size_t *, loff_t *); | |
631 | extern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1]; | |
632 | int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *, int, struct file *, | |
633 | void __user *, size_t *, loff_t *); | |
8ad4b1fb RS |
634 | int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *, int, struct file *, |
635 | void __user *, size_t *, loff_t *); | |
9614634f CL |
636 | int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *, int, |
637 | struct file *, void __user *, size_t *, loff_t *); | |
0ff38490 CL |
638 | int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *, int, |
639 | struct file *, void __user *, size_t *, loff_t *); | |
1da177e4 | 640 | |
f0c0b2b8 KH |
641 | extern int numa_zonelist_order_handler(struct ctl_table *, int, |
642 | struct file *, void __user *, size_t *, loff_t *); | |
643 | extern char numa_zonelist_order[]; | |
644 | #define NUMA_ZONELIST_ORDER_LEN 16 /* string buffer size */ | |
645 | ||
1da177e4 LT |
646 | #include <linux/topology.h> |
647 | /* Returns the number of the current Node. */ | |
69d81fcd | 648 | #ifndef numa_node_id |
39c715b7 | 649 | #define numa_node_id() (cpu_to_node(raw_smp_processor_id())) |
69d81fcd | 650 | #endif |
1da177e4 | 651 | |
93b7504e | 652 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
653 | |
654 | extern struct pglist_data contig_page_data; | |
655 | #define NODE_DATA(nid) (&contig_page_data) | |
656 | #define NODE_MEM_MAP(nid) mem_map | |
657 | #define MAX_NODES_SHIFT 1 | |
1da177e4 | 658 | |
93b7504e | 659 | #else /* CONFIG_NEED_MULTIPLE_NODES */ |
1da177e4 LT |
660 | |
661 | #include <asm/mmzone.h> | |
662 | ||
93b7504e | 663 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
348f8b6c | 664 | |
95144c78 KH |
665 | extern struct pglist_data *first_online_pgdat(void); |
666 | extern struct pglist_data *next_online_pgdat(struct pglist_data *pgdat); | |
667 | extern struct zone *next_zone(struct zone *zone); | |
8357f869 KH |
668 | |
669 | /** | |
670 | * for_each_pgdat - helper macro to iterate over all nodes | |
671 | * @pgdat - pointer to a pg_data_t variable | |
672 | */ | |
673 | #define for_each_online_pgdat(pgdat) \ | |
674 | for (pgdat = first_online_pgdat(); \ | |
675 | pgdat; \ | |
676 | pgdat = next_online_pgdat(pgdat)) | |
8357f869 KH |
677 | /** |
678 | * for_each_zone - helper macro to iterate over all memory zones | |
679 | * @zone - pointer to struct zone variable | |
680 | * | |
681 | * The user only needs to declare the zone variable, for_each_zone | |
682 | * fills it in. | |
683 | */ | |
684 | #define for_each_zone(zone) \ | |
685 | for (zone = (first_online_pgdat())->node_zones; \ | |
686 | zone; \ | |
687 | zone = next_zone(zone)) | |
688 | ||
d41dee36 AW |
689 | #ifdef CONFIG_SPARSEMEM |
690 | #include <asm/sparsemem.h> | |
691 | #endif | |
692 | ||
07808b74 | 693 | #if BITS_PER_LONG == 32 |
1da177e4 | 694 | /* |
a2f1b424 AK |
695 | * with 32 bit page->flags field, we reserve 9 bits for node/zone info. |
696 | * there are 4 zones (3 bits) and this leaves 9-3=6 bits for nodes. | |
1da177e4 | 697 | */ |
a2f1b424 | 698 | #define FLAGS_RESERVED 9 |
348f8b6c | 699 | |
1da177e4 LT |
700 | #elif BITS_PER_LONG == 64 |
701 | /* | |
702 | * with 64 bit flags field, there's plenty of room. | |
703 | */ | |
348f8b6c | 704 | #define FLAGS_RESERVED 32 |
1da177e4 | 705 | |
348f8b6c | 706 | #else |
1da177e4 | 707 | |
348f8b6c | 708 | #error BITS_PER_LONG not defined |
1da177e4 | 709 | |
1da177e4 LT |
710 | #endif |
711 | ||
c713216d MG |
712 | #if !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) && \ |
713 | !defined(CONFIG_ARCH_POPULATES_NODE_MAP) | |
b159d43f AW |
714 | #define early_pfn_to_nid(nid) (0UL) |
715 | #endif | |
716 | ||
2bdaf115 AW |
717 | #ifdef CONFIG_FLATMEM |
718 | #define pfn_to_nid(pfn) (0) | |
719 | #endif | |
720 | ||
d41dee36 AW |
721 | #define pfn_to_section_nr(pfn) ((pfn) >> PFN_SECTION_SHIFT) |
722 | #define section_nr_to_pfn(sec) ((sec) << PFN_SECTION_SHIFT) | |
723 | ||
724 | #ifdef CONFIG_SPARSEMEM | |
725 | ||
726 | /* | |
727 | * SECTION_SHIFT #bits space required to store a section # | |
728 | * | |
729 | * PA_SECTION_SHIFT physical address to/from section number | |
730 | * PFN_SECTION_SHIFT pfn to/from section number | |
731 | */ | |
732 | #define SECTIONS_SHIFT (MAX_PHYSMEM_BITS - SECTION_SIZE_BITS) | |
733 | ||
734 | #define PA_SECTION_SHIFT (SECTION_SIZE_BITS) | |
735 | #define PFN_SECTION_SHIFT (SECTION_SIZE_BITS - PAGE_SHIFT) | |
736 | ||
737 | #define NR_MEM_SECTIONS (1UL << SECTIONS_SHIFT) | |
738 | ||
739 | #define PAGES_PER_SECTION (1UL << PFN_SECTION_SHIFT) | |
740 | #define PAGE_SECTION_MASK (~(PAGES_PER_SECTION-1)) | |
741 | ||
835c134e | 742 | #define SECTION_BLOCKFLAGS_BITS \ |
d9c23400 | 743 | ((1UL << (PFN_SECTION_SHIFT - pageblock_order)) * NR_PAGEBLOCK_BITS) |
835c134e | 744 | |
d41dee36 AW |
745 | #if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS |
746 | #error Allocator MAX_ORDER exceeds SECTION_SIZE | |
747 | #endif | |
748 | ||
749 | struct page; | |
750 | struct mem_section { | |
29751f69 AW |
751 | /* |
752 | * This is, logically, a pointer to an array of struct | |
753 | * pages. However, it is stored with some other magic. | |
754 | * (see sparse.c::sparse_init_one_section()) | |
755 | * | |
30c253e6 AW |
756 | * Additionally during early boot we encode node id of |
757 | * the location of the section here to guide allocation. | |
758 | * (see sparse.c::memory_present()) | |
759 | * | |
29751f69 AW |
760 | * Making it a UL at least makes someone do a cast |
761 | * before using it wrong. | |
762 | */ | |
763 | unsigned long section_mem_map; | |
5c0e3066 MG |
764 | |
765 | /* See declaration of similar field in struct zone */ | |
766 | unsigned long *pageblock_flags; | |
d41dee36 AW |
767 | }; |
768 | ||
3e347261 BP |
769 | #ifdef CONFIG_SPARSEMEM_EXTREME |
770 | #define SECTIONS_PER_ROOT (PAGE_SIZE / sizeof (struct mem_section)) | |
771 | #else | |
772 | #define SECTIONS_PER_ROOT 1 | |
773 | #endif | |
802f192e | 774 | |
3e347261 BP |
775 | #define SECTION_NR_TO_ROOT(sec) ((sec) / SECTIONS_PER_ROOT) |
776 | #define NR_SECTION_ROOTS (NR_MEM_SECTIONS / SECTIONS_PER_ROOT) | |
777 | #define SECTION_ROOT_MASK (SECTIONS_PER_ROOT - 1) | |
802f192e | 778 | |
3e347261 BP |
779 | #ifdef CONFIG_SPARSEMEM_EXTREME |
780 | extern struct mem_section *mem_section[NR_SECTION_ROOTS]; | |
802f192e | 781 | #else |
3e347261 BP |
782 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]; |
783 | #endif | |
d41dee36 | 784 | |
29751f69 AW |
785 | static inline struct mem_section *__nr_to_section(unsigned long nr) |
786 | { | |
3e347261 BP |
787 | if (!mem_section[SECTION_NR_TO_ROOT(nr)]) |
788 | return NULL; | |
789 | return &mem_section[SECTION_NR_TO_ROOT(nr)][nr & SECTION_ROOT_MASK]; | |
29751f69 | 790 | } |
4ca644d9 | 791 | extern int __section_nr(struct mem_section* ms); |
29751f69 AW |
792 | |
793 | /* | |
794 | * We use the lower bits of the mem_map pointer to store | |
795 | * a little bit of information. There should be at least | |
796 | * 3 bits here due to 32-bit alignment. | |
797 | */ | |
798 | #define SECTION_MARKED_PRESENT (1UL<<0) | |
799 | #define SECTION_HAS_MEM_MAP (1UL<<1) | |
800 | #define SECTION_MAP_LAST_BIT (1UL<<2) | |
801 | #define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1)) | |
30c253e6 | 802 | #define SECTION_NID_SHIFT 2 |
29751f69 AW |
803 | |
804 | static inline struct page *__section_mem_map_addr(struct mem_section *section) | |
805 | { | |
806 | unsigned long map = section->section_mem_map; | |
807 | map &= SECTION_MAP_MASK; | |
808 | return (struct page *)map; | |
809 | } | |
810 | ||
540557b9 | 811 | static inline int present_section(struct mem_section *section) |
29751f69 | 812 | { |
802f192e | 813 | return (section && (section->section_mem_map & SECTION_MARKED_PRESENT)); |
29751f69 AW |
814 | } |
815 | ||
540557b9 AW |
816 | static inline int present_section_nr(unsigned long nr) |
817 | { | |
818 | return present_section(__nr_to_section(nr)); | |
819 | } | |
820 | ||
821 | static inline int valid_section(struct mem_section *section) | |
29751f69 | 822 | { |
802f192e | 823 | return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP)); |
29751f69 AW |
824 | } |
825 | ||
826 | static inline int valid_section_nr(unsigned long nr) | |
827 | { | |
828 | return valid_section(__nr_to_section(nr)); | |
829 | } | |
830 | ||
d41dee36 AW |
831 | static inline struct mem_section *__pfn_to_section(unsigned long pfn) |
832 | { | |
29751f69 | 833 | return __nr_to_section(pfn_to_section_nr(pfn)); |
d41dee36 AW |
834 | } |
835 | ||
d41dee36 AW |
836 | static inline int pfn_valid(unsigned long pfn) |
837 | { | |
838 | if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) | |
839 | return 0; | |
29751f69 | 840 | return valid_section(__nr_to_section(pfn_to_section_nr(pfn))); |
d41dee36 AW |
841 | } |
842 | ||
540557b9 AW |
843 | static inline int pfn_present(unsigned long pfn) |
844 | { | |
845 | if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) | |
846 | return 0; | |
847 | return present_section(__nr_to_section(pfn_to_section_nr(pfn))); | |
848 | } | |
849 | ||
d41dee36 AW |
850 | /* |
851 | * These are _only_ used during initialisation, therefore they | |
852 | * can use __initdata ... They could have names to indicate | |
853 | * this restriction. | |
854 | */ | |
855 | #ifdef CONFIG_NUMA | |
161599ff AW |
856 | #define pfn_to_nid(pfn) \ |
857 | ({ \ | |
858 | unsigned long __pfn_to_nid_pfn = (pfn); \ | |
859 | page_to_nid(pfn_to_page(__pfn_to_nid_pfn)); \ | |
860 | }) | |
2bdaf115 AW |
861 | #else |
862 | #define pfn_to_nid(pfn) (0) | |
d41dee36 AW |
863 | #endif |
864 | ||
d41dee36 AW |
865 | #define early_pfn_valid(pfn) pfn_valid(pfn) |
866 | void sparse_init(void); | |
867 | #else | |
868 | #define sparse_init() do {} while (0) | |
28ae55c9 | 869 | #define sparse_index_init(_sec, _nid) do {} while (0) |
d41dee36 AW |
870 | #endif /* CONFIG_SPARSEMEM */ |
871 | ||
75167957 AW |
872 | #ifdef CONFIG_NODES_SPAN_OTHER_NODES |
873 | #define early_pfn_in_nid(pfn, nid) (early_pfn_to_nid(pfn) == (nid)) | |
874 | #else | |
875 | #define early_pfn_in_nid(pfn, nid) (1) | |
876 | #endif | |
877 | ||
d41dee36 AW |
878 | #ifndef early_pfn_valid |
879 | #define early_pfn_valid(pfn) (1) | |
880 | #endif | |
881 | ||
882 | void memory_present(int nid, unsigned long start, unsigned long end); | |
883 | unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long); | |
884 | ||
14e07298 AW |
885 | /* |
886 | * If it is possible to have holes within a MAX_ORDER_NR_PAGES, then we | |
887 | * need to check pfn validility within that MAX_ORDER_NR_PAGES block. | |
888 | * pfn_valid_within() should be used in this case; we optimise this away | |
889 | * when we have no holes within a MAX_ORDER_NR_PAGES block. | |
890 | */ | |
891 | #ifdef CONFIG_HOLES_IN_ZONE | |
892 | #define pfn_valid_within(pfn) pfn_valid(pfn) | |
893 | #else | |
894 | #define pfn_valid_within(pfn) (1) | |
895 | #endif | |
896 | ||
1da177e4 LT |
897 | #endif /* !__ASSEMBLY__ */ |
898 | #endif /* __KERNEL__ */ | |
899 | #endif /* _LINUX_MMZONE_H */ |