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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_MMZONE_H |
3 | #define _LINUX_MMZONE_H | |
4 | ||
1da177e4 | 5 | #ifndef __ASSEMBLY__ |
97965478 | 6 | #ifndef __GENERATING_BOUNDS_H |
1da177e4 | 7 | |
1da177e4 LT |
8 | #include <linux/spinlock.h> |
9 | #include <linux/list.h> | |
e4dde56c | 10 | #include <linux/list_nulls.h> |
1da177e4 | 11 | #include <linux/wait.h> |
e815af95 | 12 | #include <linux/bitops.h> |
1da177e4 LT |
13 | #include <linux/cache.h> |
14 | #include <linux/threads.h> | |
15 | #include <linux/numa.h> | |
16 | #include <linux/init.h> | |
bdc8cb98 | 17 | #include <linux/seqlock.h> |
8357f869 | 18 | #include <linux/nodemask.h> |
835c134e | 19 | #include <linux/pageblock-flags.h> |
bbeae5b0 | 20 | #include <linux/page-flags-layout.h> |
60063497 | 21 | #include <linux/atomic.h> |
b03641af DW |
22 | #include <linux/mm_types.h> |
23 | #include <linux/page-flags.h> | |
dbbee9d5 | 24 | #include <linux/local_lock.h> |
93ff66bf | 25 | #include <asm/page.h> |
1da177e4 LT |
26 | |
27 | /* Free memory management - zoned buddy allocator. */ | |
0192445c | 28 | #ifndef CONFIG_ARCH_FORCE_MAX_ORDER |
23baf831 | 29 | #define MAX_ORDER 10 |
1da177e4 | 30 | #else |
0192445c | 31 | #define MAX_ORDER CONFIG_ARCH_FORCE_MAX_ORDER |
1da177e4 | 32 | #endif |
23baf831 | 33 | #define MAX_ORDER_NR_PAGES (1 << MAX_ORDER) |
1da177e4 | 34 | |
3f6dac0f KS |
35 | #define IS_MAX_ORDER_ALIGNED(pfn) IS_ALIGNED(pfn, MAX_ORDER_NR_PAGES) |
36 | ||
5ad333eb AW |
37 | /* |
38 | * PAGE_ALLOC_COSTLY_ORDER is the order at which allocations are deemed | |
39 | * costly to service. That is between allocation orders which should | |
35fca53e | 40 | * coalesce naturally under reasonable reclaim pressure and those which |
5ad333eb AW |
41 | * will not. |
42 | */ | |
43 | #define PAGE_ALLOC_COSTLY_ORDER 3 | |
44 | ||
a6ffdc07 | 45 | enum migratetype { |
47118af0 | 46 | MIGRATE_UNMOVABLE, |
47118af0 | 47 | MIGRATE_MOVABLE, |
016c13da | 48 | MIGRATE_RECLAIMABLE, |
0aaa29a5 MG |
49 | MIGRATE_PCPTYPES, /* the number of types on the pcp lists */ |
50 | MIGRATE_HIGHATOMIC = MIGRATE_PCPTYPES, | |
47118af0 MN |
51 | #ifdef CONFIG_CMA |
52 | /* | |
53 | * MIGRATE_CMA migration type is designed to mimic the way | |
54 | * ZONE_MOVABLE works. Only movable pages can be allocated | |
55 | * from MIGRATE_CMA pageblocks and page allocator never | |
56 | * implicitly change migration type of MIGRATE_CMA pageblock. | |
57 | * | |
58 | * The way to use it is to change migratetype of a range of | |
59 | * pageblocks to MIGRATE_CMA which can be done by | |
11ac3e87 | 60 | * __free_pageblock_cma() function. |
47118af0 MN |
61 | */ |
62 | MIGRATE_CMA, | |
63 | #endif | |
194159fb | 64 | #ifdef CONFIG_MEMORY_ISOLATION |
47118af0 | 65 | MIGRATE_ISOLATE, /* can't allocate from here */ |
194159fb | 66 | #endif |
47118af0 MN |
67 | MIGRATE_TYPES |
68 | }; | |
69 | ||
60f30350 | 70 | /* In mm/page_alloc.c; keep in sync also with show_migration_types() there */ |
c999fbd3 | 71 | extern const char * const migratetype_names[MIGRATE_TYPES]; |
60f30350 | 72 | |
47118af0 MN |
73 | #ifdef CONFIG_CMA |
74 | # define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA) | |
7c15d9bb | 75 | # define is_migrate_cma_page(_page) (get_pageblock_migratetype(_page) == MIGRATE_CMA) |
47118af0 MN |
76 | #else |
77 | # define is_migrate_cma(migratetype) false | |
7c15d9bb | 78 | # define is_migrate_cma_page(_page) false |
47118af0 | 79 | #endif |
b2a0ac88 | 80 | |
b682debd VB |
81 | static inline bool is_migrate_movable(int mt) |
82 | { | |
83 | return is_migrate_cma(mt) || mt == MIGRATE_MOVABLE; | |
84 | } | |
85 | ||
1dd214b8 ZY |
86 | /* |
87 | * Check whether a migratetype can be merged with another migratetype. | |
88 | * | |
89 | * It is only mergeable when it can fall back to other migratetypes for | |
90 | * allocation. See fallbacks[MIGRATE_TYPES][3] in page_alloc.c. | |
91 | */ | |
92 | static inline bool migratetype_is_mergeable(int mt) | |
93 | { | |
94 | return mt < MIGRATE_PCPTYPES; | |
95 | } | |
96 | ||
b2a0ac88 | 97 | #define for_each_migratetype_order(order, type) \ |
23baf831 | 98 | for (order = 0; order <= MAX_ORDER; order++) \ |
b2a0ac88 MG |
99 | for (type = 0; type < MIGRATE_TYPES; type++) |
100 | ||
467c996c MG |
101 | extern int page_group_by_mobility_disabled; |
102 | ||
d38ac97f | 103 | #define MIGRATETYPE_MASK ((1UL << PB_migratetype_bits) - 1) |
e58469ba | 104 | |
dc4b0caf | 105 | #define get_pageblock_migratetype(page) \ |
535b81e2 | 106 | get_pfnblock_flags_mask(page, page_to_pfn(page), MIGRATETYPE_MASK) |
dc4b0caf | 107 | |
1da177e4 | 108 | struct free_area { |
b2a0ac88 | 109 | struct list_head free_list[MIGRATE_TYPES]; |
1da177e4 LT |
110 | unsigned long nr_free; |
111 | }; | |
112 | ||
113 | struct pglist_data; | |
114 | ||
3a321d2a KW |
115 | #ifdef CONFIG_NUMA |
116 | enum numa_stat_item { | |
117 | NUMA_HIT, /* allocated in intended node */ | |
118 | NUMA_MISS, /* allocated in non intended node */ | |
119 | NUMA_FOREIGN, /* was intended here, hit elsewhere */ | |
120 | NUMA_INTERLEAVE_HIT, /* interleaver preferred this zone */ | |
121 | NUMA_LOCAL, /* allocation from local node */ | |
122 | NUMA_OTHER, /* allocation from other node */ | |
f19298b9 | 123 | NR_VM_NUMA_EVENT_ITEMS |
3a321d2a KW |
124 | }; |
125 | #else | |
f19298b9 | 126 | #define NR_VM_NUMA_EVENT_ITEMS 0 |
3a321d2a KW |
127 | #endif |
128 | ||
2244b95a | 129 | enum zone_stat_item { |
51ed4491 | 130 | /* First 128 byte cacheline (assuming 64 bit words) */ |
d23ad423 | 131 | NR_FREE_PAGES, |
71c799f4 MK |
132 | NR_ZONE_LRU_BASE, /* Used only for compaction and reclaim retry */ |
133 | NR_ZONE_INACTIVE_ANON = NR_ZONE_LRU_BASE, | |
134 | NR_ZONE_ACTIVE_ANON, | |
135 | NR_ZONE_INACTIVE_FILE, | |
136 | NR_ZONE_ACTIVE_FILE, | |
137 | NR_ZONE_UNEVICTABLE, | |
5a1c84b4 | 138 | NR_ZONE_WRITE_PENDING, /* Count of dirty, writeback and unstable pages */ |
5344b7e6 | 139 | NR_MLOCK, /* mlock()ed pages found and moved off LRU */ |
c6a7f572 | 140 | /* Second 128 byte cacheline */ |
d2c5e30c | 141 | NR_BOUNCE, |
91537fee MK |
142 | #if IS_ENABLED(CONFIG_ZSMALLOC) |
143 | NR_ZSPAGES, /* allocated in zsmalloc */ | |
ca889e6c | 144 | #endif |
d1ce749a | 145 | NR_FREE_CMA_PAGES, |
2244b95a CL |
146 | NR_VM_ZONE_STAT_ITEMS }; |
147 | ||
75ef7184 | 148 | enum node_stat_item { |
599d0c95 MG |
149 | NR_LRU_BASE, |
150 | NR_INACTIVE_ANON = NR_LRU_BASE, /* must match order of LRU_[IN]ACTIVE */ | |
151 | NR_ACTIVE_ANON, /* " " " " " */ | |
152 | NR_INACTIVE_FILE, /* " " " " " */ | |
153 | NR_ACTIVE_FILE, /* " " " " " */ | |
154 | NR_UNEVICTABLE, /* " " " " " */ | |
d42f3245 RG |
155 | NR_SLAB_RECLAIMABLE_B, |
156 | NR_SLAB_UNRECLAIMABLE_B, | |
599d0c95 MG |
157 | NR_ISOLATED_ANON, /* Temporary isolated pages from anon lru */ |
158 | NR_ISOLATED_FILE, /* Temporary isolated pages from file lru */ | |
68d48e6a | 159 | WORKINGSET_NODES, |
170b04b7 JK |
160 | WORKINGSET_REFAULT_BASE, |
161 | WORKINGSET_REFAULT_ANON = WORKINGSET_REFAULT_BASE, | |
162 | WORKINGSET_REFAULT_FILE, | |
163 | WORKINGSET_ACTIVATE_BASE, | |
164 | WORKINGSET_ACTIVATE_ANON = WORKINGSET_ACTIVATE_BASE, | |
165 | WORKINGSET_ACTIVATE_FILE, | |
166 | WORKINGSET_RESTORE_BASE, | |
167 | WORKINGSET_RESTORE_ANON = WORKINGSET_RESTORE_BASE, | |
168 | WORKINGSET_RESTORE_FILE, | |
1e6b1085 | 169 | WORKINGSET_NODERECLAIM, |
4b9d0fab | 170 | NR_ANON_MAPPED, /* Mapped anonymous pages */ |
50658e2e MG |
171 | NR_FILE_MAPPED, /* pagecache pages mapped into pagetables. |
172 | only modified from process context */ | |
11fb9989 MG |
173 | NR_FILE_PAGES, |
174 | NR_FILE_DIRTY, | |
175 | NR_WRITEBACK, | |
176 | NR_WRITEBACK_TEMP, /* Writeback using temporary buffers */ | |
177 | NR_SHMEM, /* shmem pages (included tmpfs/GEM pages) */ | |
178 | NR_SHMEM_THPS, | |
179 | NR_SHMEM_PMDMAPPED, | |
60fbf0ab SL |
180 | NR_FILE_THPS, |
181 | NR_FILE_PMDMAPPED, | |
11fb9989 | 182 | NR_ANON_THPS, |
c4a25635 MG |
183 | NR_VMSCAN_WRITE, |
184 | NR_VMSCAN_IMMEDIATE, /* Prioritise for reclaim when writeback ends */ | |
185 | NR_DIRTIED, /* page dirtyings since bootup */ | |
186 | NR_WRITTEN, /* page writings since bootup */ | |
8cd7c588 | 187 | NR_THROTTLED_WRITTEN, /* NR_WRITTEN while reclaim throttled */ |
b29940c1 | 188 | NR_KERNEL_MISC_RECLAIMABLE, /* reclaimable non-slab kernel pages */ |
1970dc6f JH |
189 | NR_FOLL_PIN_ACQUIRED, /* via: pin_user_page(), gup flag: FOLL_PIN */ |
190 | NR_FOLL_PIN_RELEASED, /* pages returned via unpin_user_page() */ | |
991e7673 SB |
191 | NR_KERNEL_STACK_KB, /* measured in KiB */ |
192 | #if IS_ENABLED(CONFIG_SHADOW_CALL_STACK) | |
193 | NR_KERNEL_SCS_KB, /* measured in KiB */ | |
194 | #endif | |
f0c0c115 | 195 | NR_PAGETABLE, /* used for pagetables */ |
ebc97a52 | 196 | NR_SECONDARY_PAGETABLE, /* secondary pagetables, e.g. KVM pagetables */ |
b6038942 SB |
197 | #ifdef CONFIG_SWAP |
198 | NR_SWAPCACHE, | |
e39bb6be HY |
199 | #endif |
200 | #ifdef CONFIG_NUMA_BALANCING | |
201 | PGPROMOTE_SUCCESS, /* promote successfully */ | |
c6833e10 | 202 | PGPROMOTE_CANDIDATE, /* candidate pages to promote */ |
b6038942 | 203 | #endif |
75ef7184 MG |
204 | NR_VM_NODE_STAT_ITEMS |
205 | }; | |
206 | ||
69473e5d MS |
207 | /* |
208 | * Returns true if the item should be printed in THPs (/proc/vmstat | |
209 | * currently prints number of anon, file and shmem THPs. But the item | |
210 | * is charged in pages). | |
211 | */ | |
212 | static __always_inline bool vmstat_item_print_in_thp(enum node_stat_item item) | |
213 | { | |
214 | if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) | |
215 | return false; | |
216 | ||
bf9ecead | 217 | return item == NR_ANON_THPS || |
57b2847d | 218 | item == NR_FILE_THPS || |
a1528e21 | 219 | item == NR_SHMEM_THPS || |
380780e7 MS |
220 | item == NR_SHMEM_PMDMAPPED || |
221 | item == NR_FILE_PMDMAPPED; | |
69473e5d MS |
222 | } |
223 | ||
ea426c2a RG |
224 | /* |
225 | * Returns true if the value is measured in bytes (most vmstat values are | |
226 | * measured in pages). This defines the API part, the internal representation | |
227 | * might be different. | |
228 | */ | |
229 | static __always_inline bool vmstat_item_in_bytes(int idx) | |
230 | { | |
d42f3245 RG |
231 | /* |
232 | * Global and per-node slab counters track slab pages. | |
233 | * It's expected that changes are multiples of PAGE_SIZE. | |
234 | * Internally values are stored in pages. | |
235 | * | |
236 | * Per-memcg and per-lruvec counters track memory, consumed | |
237 | * by individual slab objects. These counters are actually | |
238 | * byte-precise. | |
239 | */ | |
240 | return (idx == NR_SLAB_RECLAIMABLE_B || | |
241 | idx == NR_SLAB_UNRECLAIMABLE_B); | |
ea426c2a RG |
242 | } |
243 | ||
4f98a2fe RR |
244 | /* |
245 | * We do arithmetic on the LRU lists in various places in the code, | |
246 | * so it is important to keep the active lists LRU_ACTIVE higher in | |
247 | * the array than the corresponding inactive lists, and to keep | |
248 | * the *_FILE lists LRU_FILE higher than the corresponding _ANON lists. | |
249 | * | |
250 | * This has to be kept in sync with the statistics in zone_stat_item | |
251 | * above and the descriptions in vmstat_text in mm/vmstat.c | |
252 | */ | |
253 | #define LRU_BASE 0 | |
254 | #define LRU_ACTIVE 1 | |
255 | #define LRU_FILE 2 | |
256 | ||
b69408e8 | 257 | enum lru_list { |
4f98a2fe RR |
258 | LRU_INACTIVE_ANON = LRU_BASE, |
259 | LRU_ACTIVE_ANON = LRU_BASE + LRU_ACTIVE, | |
260 | LRU_INACTIVE_FILE = LRU_BASE + LRU_FILE, | |
261 | LRU_ACTIVE_FILE = LRU_BASE + LRU_FILE + LRU_ACTIVE, | |
894bc310 | 262 | LRU_UNEVICTABLE, |
894bc310 LS |
263 | NR_LRU_LISTS |
264 | }; | |
b69408e8 | 265 | |
8cd7c588 MG |
266 | enum vmscan_throttle_state { |
267 | VMSCAN_THROTTLE_WRITEBACK, | |
d818fca1 | 268 | VMSCAN_THROTTLE_ISOLATED, |
69392a40 | 269 | VMSCAN_THROTTLE_NOPROGRESS, |
1b4e3f26 | 270 | VMSCAN_THROTTLE_CONGESTED, |
8cd7c588 MG |
271 | NR_VMSCAN_THROTTLE, |
272 | }; | |
273 | ||
4111304d | 274 | #define for_each_lru(lru) for (lru = 0; lru < NR_LRU_LISTS; lru++) |
b69408e8 | 275 | |
4111304d | 276 | #define for_each_evictable_lru(lru) for (lru = 0; lru <= LRU_ACTIVE_FILE; lru++) |
894bc310 | 277 | |
b91ac374 | 278 | static inline bool is_file_lru(enum lru_list lru) |
4f98a2fe | 279 | { |
4111304d | 280 | return (lru == LRU_INACTIVE_FILE || lru == LRU_ACTIVE_FILE); |
4f98a2fe RR |
281 | } |
282 | ||
b91ac374 | 283 | static inline bool is_active_lru(enum lru_list lru) |
b69408e8 | 284 | { |
4111304d | 285 | return (lru == LRU_ACTIVE_ANON || lru == LRU_ACTIVE_FILE); |
b69408e8 CL |
286 | } |
287 | ||
e9c2dbc8 YY |
288 | #define WORKINGSET_ANON 0 |
289 | #define WORKINGSET_FILE 1 | |
ed017373 YZ |
290 | #define ANON_AND_FILE 2 |
291 | ||
1b05117d JW |
292 | enum lruvec_flags { |
293 | LRUVEC_CONGESTED, /* lruvec has many dirty pages | |
294 | * backed by a congested BDI | |
295 | */ | |
296 | }; | |
297 | ||
ec1c86b2 YZ |
298 | #endif /* !__GENERATING_BOUNDS_H */ |
299 | ||
300 | /* | |
301 | * Evictable pages are divided into multiple generations. The youngest and the | |
302 | * oldest generation numbers, max_seq and min_seq, are monotonically increasing. | |
303 | * They form a sliding window of a variable size [MIN_NR_GENS, MAX_NR_GENS]. An | |
304 | * offset within MAX_NR_GENS, i.e., gen, indexes the LRU list of the | |
305 | * corresponding generation. The gen counter in folio->flags stores gen+1 while | |
6df1b221 | 306 | * a page is on one of lrugen->folios[]. Otherwise it stores 0. |
ec1c86b2 YZ |
307 | * |
308 | * A page is added to the youngest generation on faulting. The aging needs to | |
309 | * check the accessed bit at least twice before handing this page over to the | |
310 | * eviction. The first check takes care of the accessed bit set on the initial | |
311 | * fault; the second check makes sure this page hasn't been used since then. | |
312 | * This process, AKA second chance, requires a minimum of two generations, | |
313 | * hence MIN_NR_GENS. And to maintain ABI compatibility with the active/inactive | |
314 | * LRU, e.g., /proc/vmstat, these two generations are considered active; the | |
315 | * rest of generations, if they exist, are considered inactive. See | |
316 | * lru_gen_is_active(). | |
317 | * | |
6df1b221 YZ |
318 | * PG_active is always cleared while a page is on one of lrugen->folios[] so |
319 | * that the aging needs not to worry about it. And it's set again when a page | |
ec1c86b2 YZ |
320 | * considered active is isolated for non-reclaiming purposes, e.g., migration. |
321 | * See lru_gen_add_folio() and lru_gen_del_folio(). | |
322 | * | |
323 | * MAX_NR_GENS is set to 4 so that the multi-gen LRU can support twice the | |
324 | * number of categories of the active/inactive LRU when keeping track of | |
325 | * accesses through page tables. This requires order_base_2(MAX_NR_GENS+1) bits | |
326 | * in folio->flags. | |
327 | */ | |
328 | #define MIN_NR_GENS 2U | |
329 | #define MAX_NR_GENS 4U | |
330 | ||
ac35a490 YZ |
331 | /* |
332 | * Each generation is divided into multiple tiers. A page accessed N times | |
333 | * through file descriptors is in tier order_base_2(N). A page in the first tier | |
334 | * (N=0,1) is marked by PG_referenced unless it was faulted in through page | |
335 | * tables or read ahead. A page in any other tier (N>1) is marked by | |
336 | * PG_referenced and PG_workingset. This implies a minimum of two tiers is | |
337 | * supported without using additional bits in folio->flags. | |
338 | * | |
339 | * In contrast to moving across generations which requires the LRU lock, moving | |
340 | * across tiers only involves atomic operations on folio->flags and therefore | |
341 | * has a negligible cost in the buffered access path. In the eviction path, | |
342 | * comparisons of refaulted/(evicted+protected) from the first tier and the | |
343 | * rest infer whether pages accessed multiple times through file descriptors | |
344 | * are statistically hot and thus worth protecting. | |
345 | * | |
346 | * MAX_NR_TIERS is set to 4 so that the multi-gen LRU can support twice the | |
347 | * number of categories of the active/inactive LRU when keeping track of | |
348 | * accesses through file descriptors. This uses MAX_NR_TIERS-2 spare bits in | |
349 | * folio->flags. | |
350 | */ | |
351 | #define MAX_NR_TIERS 4U | |
352 | ||
ec1c86b2 YZ |
353 | #ifndef __GENERATING_BOUNDS_H |
354 | ||
355 | struct lruvec; | |
018ee47f | 356 | struct page_vma_mapped_walk; |
ec1c86b2 YZ |
357 | |
358 | #define LRU_GEN_MASK ((BIT(LRU_GEN_WIDTH) - 1) << LRU_GEN_PGOFF) | |
359 | #define LRU_REFS_MASK ((BIT(LRU_REFS_WIDTH) - 1) << LRU_REFS_PGOFF) | |
360 | ||
361 | #ifdef CONFIG_LRU_GEN | |
362 | ||
363 | enum { | |
364 | LRU_GEN_ANON, | |
365 | LRU_GEN_FILE, | |
366 | }; | |
367 | ||
354ed597 YZ |
368 | enum { |
369 | LRU_GEN_CORE, | |
370 | LRU_GEN_MM_WALK, | |
371 | LRU_GEN_NONLEAF_YOUNG, | |
372 | NR_LRU_GEN_CAPS | |
373 | }; | |
374 | ||
ac35a490 YZ |
375 | #define MIN_LRU_BATCH BITS_PER_LONG |
376 | #define MAX_LRU_BATCH (MIN_LRU_BATCH * 64) | |
377 | ||
378 | /* whether to keep historical stats from evicted generations */ | |
379 | #ifdef CONFIG_LRU_GEN_STATS | |
380 | #define NR_HIST_GENS MAX_NR_GENS | |
381 | #else | |
382 | #define NR_HIST_GENS 1U | |
383 | #endif | |
384 | ||
ec1c86b2 YZ |
385 | /* |
386 | * The youngest generation number is stored in max_seq for both anon and file | |
387 | * types as they are aged on an equal footing. The oldest generation numbers are | |
388 | * stored in min_seq[] separately for anon and file types as clean file pages | |
389 | * can be evicted regardless of swap constraints. | |
390 | * | |
391 | * Normally anon and file min_seq are in sync. But if swapping is constrained, | |
392 | * e.g., out of swap space, file min_seq is allowed to advance and leave anon | |
393 | * min_seq behind. | |
394 | * | |
395 | * The number of pages in each generation is eventually consistent and therefore | |
bd74fdae | 396 | * can be transiently negative when reset_batch_size() is pending. |
ec1c86b2 | 397 | */ |
391655fe | 398 | struct lru_gen_folio { |
ec1c86b2 YZ |
399 | /* the aging increments the youngest generation number */ |
400 | unsigned long max_seq; | |
401 | /* the eviction increments the oldest generation numbers */ | |
402 | unsigned long min_seq[ANON_AND_FILE]; | |
1332a809 YZ |
403 | /* the birth time of each generation in jiffies */ |
404 | unsigned long timestamps[MAX_NR_GENS]; | |
ec1c86b2 | 405 | /* the multi-gen LRU lists, lazily sorted on eviction */ |
6df1b221 | 406 | struct list_head folios[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES]; |
ec1c86b2 YZ |
407 | /* the multi-gen LRU sizes, eventually consistent */ |
408 | long nr_pages[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES]; | |
ac35a490 YZ |
409 | /* the exponential moving average of refaulted */ |
410 | unsigned long avg_refaulted[ANON_AND_FILE][MAX_NR_TIERS]; | |
411 | /* the exponential moving average of evicted+protected */ | |
412 | unsigned long avg_total[ANON_AND_FILE][MAX_NR_TIERS]; | |
413 | /* the first tier doesn't need protection, hence the minus one */ | |
414 | unsigned long protected[NR_HIST_GENS][ANON_AND_FILE][MAX_NR_TIERS - 1]; | |
415 | /* can be modified without holding the LRU lock */ | |
416 | atomic_long_t evicted[NR_HIST_GENS][ANON_AND_FILE][MAX_NR_TIERS]; | |
417 | atomic_long_t refaulted[NR_HIST_GENS][ANON_AND_FILE][MAX_NR_TIERS]; | |
354ed597 YZ |
418 | /* whether the multi-gen LRU is enabled */ |
419 | bool enabled; | |
e4dde56c YZ |
420 | #ifdef CONFIG_MEMCG |
421 | /* the memcg generation this lru_gen_folio belongs to */ | |
422 | u8 gen; | |
423 | /* the list segment this lru_gen_folio belongs to */ | |
424 | u8 seg; | |
425 | /* per-node lru_gen_folio list for global reclaim */ | |
426 | struct hlist_nulls_node list; | |
427 | #endif | |
ec1c86b2 YZ |
428 | }; |
429 | ||
bd74fdae YZ |
430 | enum { |
431 | MM_LEAF_TOTAL, /* total leaf entries */ | |
432 | MM_LEAF_OLD, /* old leaf entries */ | |
433 | MM_LEAF_YOUNG, /* young leaf entries */ | |
434 | MM_NONLEAF_TOTAL, /* total non-leaf entries */ | |
435 | MM_NONLEAF_FOUND, /* non-leaf entries found in Bloom filters */ | |
436 | MM_NONLEAF_ADDED, /* non-leaf entries added to Bloom filters */ | |
437 | NR_MM_STATS | |
438 | }; | |
439 | ||
440 | /* double-buffering Bloom filters */ | |
441 | #define NR_BLOOM_FILTERS 2 | |
442 | ||
443 | struct lru_gen_mm_state { | |
444 | /* set to max_seq after each iteration */ | |
445 | unsigned long seq; | |
7f63cf2d | 446 | /* where the current iteration continues after */ |
bd74fdae | 447 | struct list_head *head; |
7f63cf2d | 448 | /* where the last iteration ended before */ |
bd74fdae | 449 | struct list_head *tail; |
bd74fdae YZ |
450 | /* Bloom filters flip after each iteration */ |
451 | unsigned long *filters[NR_BLOOM_FILTERS]; | |
452 | /* the mm stats for debugging */ | |
453 | unsigned long stats[NR_HIST_GENS][NR_MM_STATS]; | |
bd74fdae YZ |
454 | }; |
455 | ||
456 | struct lru_gen_mm_walk { | |
457 | /* the lruvec under reclaim */ | |
458 | struct lruvec *lruvec; | |
391655fe | 459 | /* unstable max_seq from lru_gen_folio */ |
bd74fdae YZ |
460 | unsigned long max_seq; |
461 | /* the next address within an mm to scan */ | |
462 | unsigned long next_addr; | |
463 | /* to batch promoted pages */ | |
464 | int nr_pages[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES]; | |
465 | /* to batch the mm stats */ | |
466 | int mm_stats[NR_MM_STATS]; | |
467 | /* total batched items */ | |
468 | int batched; | |
469 | bool can_swap; | |
470 | bool force_scan; | |
471 | }; | |
472 | ||
ec1c86b2 | 473 | void lru_gen_init_lruvec(struct lruvec *lruvec); |
018ee47f | 474 | void lru_gen_look_around(struct page_vma_mapped_walk *pvmw); |
ec1c86b2 YZ |
475 | |
476 | #ifdef CONFIG_MEMCG | |
e4dde56c YZ |
477 | |
478 | /* | |
479 | * For each node, memcgs are divided into two generations: the old and the | |
480 | * young. For each generation, memcgs are randomly sharded into multiple bins | |
481 | * to improve scalability. For each bin, the hlist_nulls is virtually divided | |
482 | * into three segments: the head, the tail and the default. | |
483 | * | |
484 | * An onlining memcg is added to the tail of a random bin in the old generation. | |
485 | * The eviction starts at the head of a random bin in the old generation. The | |
486 | * per-node memcg generation counter, whose reminder (mod MEMCG_NR_GENS) indexes | |
487 | * the old generation, is incremented when all its bins become empty. | |
488 | * | |
489 | * There are four operations: | |
490 | * 1. MEMCG_LRU_HEAD, which moves an memcg to the head of a random bin in its | |
491 | * current generation (old or young) and updates its "seg" to "head"; | |
492 | * 2. MEMCG_LRU_TAIL, which moves an memcg to the tail of a random bin in its | |
493 | * current generation (old or young) and updates its "seg" to "tail"; | |
494 | * 3. MEMCG_LRU_OLD, which moves an memcg to the head of a random bin in the old | |
495 | * generation, updates its "gen" to "old" and resets its "seg" to "default"; | |
496 | * 4. MEMCG_LRU_YOUNG, which moves an memcg to the tail of a random bin in the | |
497 | * young generation, updates its "gen" to "young" and resets its "seg" to | |
498 | * "default". | |
499 | * | |
500 | * The events that trigger the above operations are: | |
501 | * 1. Exceeding the soft limit, which triggers MEMCG_LRU_HEAD; | |
502 | * 2. The first attempt to reclaim an memcg below low, which triggers | |
503 | * MEMCG_LRU_TAIL; | |
504 | * 3. The first attempt to reclaim an memcg below reclaimable size threshold, | |
505 | * which triggers MEMCG_LRU_TAIL; | |
506 | * 4. The second attempt to reclaim an memcg below reclaimable size threshold, | |
507 | * which triggers MEMCG_LRU_YOUNG; | |
508 | * 5. Attempting to reclaim an memcg below min, which triggers MEMCG_LRU_YOUNG; | |
509 | * 6. Finishing the aging on the eviction path, which triggers MEMCG_LRU_YOUNG; | |
510 | * 7. Offlining an memcg, which triggers MEMCG_LRU_OLD. | |
511 | * | |
512 | * Note that memcg LRU only applies to global reclaim, and the round-robin | |
513 | * incrementing of their max_seq counters ensures the eventual fairness to all | |
514 | * eligible memcgs. For memcg reclaim, it still relies on mem_cgroup_iter(). | |
515 | */ | |
516 | #define MEMCG_NR_GENS 2 | |
517 | #define MEMCG_NR_BINS 8 | |
518 | ||
519 | struct lru_gen_memcg { | |
520 | /* the per-node memcg generation counter */ | |
521 | unsigned long seq; | |
522 | /* each memcg has one lru_gen_folio per node */ | |
523 | unsigned long nr_memcgs[MEMCG_NR_GENS]; | |
524 | /* per-node lru_gen_folio list for global reclaim */ | |
525 | struct hlist_nulls_head fifo[MEMCG_NR_GENS][MEMCG_NR_BINS]; | |
526 | /* protects the above */ | |
527 | spinlock_t lock; | |
528 | }; | |
529 | ||
530 | void lru_gen_init_pgdat(struct pglist_data *pgdat); | |
531 | ||
ec1c86b2 YZ |
532 | void lru_gen_init_memcg(struct mem_cgroup *memcg); |
533 | void lru_gen_exit_memcg(struct mem_cgroup *memcg); | |
e4dde56c YZ |
534 | void lru_gen_online_memcg(struct mem_cgroup *memcg); |
535 | void lru_gen_offline_memcg(struct mem_cgroup *memcg); | |
536 | void lru_gen_release_memcg(struct mem_cgroup *memcg); | |
36c7b4db | 537 | void lru_gen_soft_reclaim(struct lruvec *lruvec); |
e4dde56c YZ |
538 | |
539 | #else /* !CONFIG_MEMCG */ | |
540 | ||
541 | #define MEMCG_NR_GENS 1 | |
542 | ||
543 | struct lru_gen_memcg { | |
544 | }; | |
545 | ||
546 | static inline void lru_gen_init_pgdat(struct pglist_data *pgdat) | |
547 | { | |
548 | } | |
549 | ||
550 | #endif /* CONFIG_MEMCG */ | |
ec1c86b2 YZ |
551 | |
552 | #else /* !CONFIG_LRU_GEN */ | |
553 | ||
e4dde56c YZ |
554 | static inline void lru_gen_init_pgdat(struct pglist_data *pgdat) |
555 | { | |
556 | } | |
557 | ||
ec1c86b2 YZ |
558 | static inline void lru_gen_init_lruvec(struct lruvec *lruvec) |
559 | { | |
560 | } | |
561 | ||
018ee47f YZ |
562 | static inline void lru_gen_look_around(struct page_vma_mapped_walk *pvmw) |
563 | { | |
564 | } | |
565 | ||
ec1c86b2 | 566 | #ifdef CONFIG_MEMCG |
e4dde56c | 567 | |
ec1c86b2 YZ |
568 | static inline void lru_gen_init_memcg(struct mem_cgroup *memcg) |
569 | { | |
570 | } | |
571 | ||
572 | static inline void lru_gen_exit_memcg(struct mem_cgroup *memcg) | |
573 | { | |
574 | } | |
e4dde56c YZ |
575 | |
576 | static inline void lru_gen_online_memcg(struct mem_cgroup *memcg) | |
577 | { | |
578 | } | |
579 | ||
580 | static inline void lru_gen_offline_memcg(struct mem_cgroup *memcg) | |
581 | { | |
582 | } | |
583 | ||
584 | static inline void lru_gen_release_memcg(struct mem_cgroup *memcg) | |
585 | { | |
586 | } | |
587 | ||
36c7b4db | 588 | static inline void lru_gen_soft_reclaim(struct lruvec *lruvec) |
e4dde56c YZ |
589 | { |
590 | } | |
591 | ||
592 | #endif /* CONFIG_MEMCG */ | |
ec1c86b2 YZ |
593 | |
594 | #endif /* CONFIG_LRU_GEN */ | |
595 | ||
6290df54 | 596 | struct lruvec { |
23047a96 | 597 | struct list_head lists[NR_LRU_LISTS]; |
6168d0da AS |
598 | /* per lruvec lru_lock for memcg */ |
599 | spinlock_t lru_lock; | |
1431d4d1 JW |
600 | /* |
601 | * These track the cost of reclaiming one LRU - file or anon - | |
602 | * over the other. As the observed cost of reclaiming one LRU | |
603 | * increases, the reclaim scan balance tips toward the other. | |
604 | */ | |
605 | unsigned long anon_cost; | |
606 | unsigned long file_cost; | |
31d8fcac JW |
607 | /* Non-resident age, driven by LRU movement */ |
608 | atomic_long_t nonresident_age; | |
ed017373 YZ |
609 | /* Refaults at the time of last reclaim cycle */ |
610 | unsigned long refaults[ANON_AND_FILE]; | |
1b05117d JW |
611 | /* Various lruvec state flags (enum lruvec_flags) */ |
612 | unsigned long flags; | |
ec1c86b2 YZ |
613 | #ifdef CONFIG_LRU_GEN |
614 | /* evictable pages divided into generations */ | |
391655fe | 615 | struct lru_gen_folio lrugen; |
bd74fdae YZ |
616 | /* to concurrently iterate lru_gen_mm_list */ |
617 | struct lru_gen_mm_state mm_state; | |
ec1c86b2 | 618 | #endif |
c255a458 | 619 | #ifdef CONFIG_MEMCG |
599d0c95 | 620 | struct pglist_data *pgdat; |
7f5e86c2 | 621 | #endif |
6290df54 JW |
622 | }; |
623 | ||
653e003d | 624 | /* Isolate unmapped pages */ |
f3fd4a61 | 625 | #define ISOLATE_UNMAPPED ((__force isolate_mode_t)0x2) |
c8244935 | 626 | /* Isolate for asynchronous migration */ |
f3fd4a61 | 627 | #define ISOLATE_ASYNC_MIGRATE ((__force isolate_mode_t)0x4) |
e46a2879 MK |
628 | /* Isolate unevictable pages */ |
629 | #define ISOLATE_UNEVICTABLE ((__force isolate_mode_t)0x8) | |
4356f21d MK |
630 | |
631 | /* LRU Isolation modes. */ | |
9efeccac | 632 | typedef unsigned __bitwise isolate_mode_t; |
4356f21d | 633 | |
41858966 MG |
634 | enum zone_watermarks { |
635 | WMARK_MIN, | |
636 | WMARK_LOW, | |
637 | WMARK_HIGH, | |
c574bbe9 | 638 | WMARK_PROMO, |
41858966 MG |
639 | NR_WMARK |
640 | }; | |
641 | ||
44042b44 | 642 | /* |
5d0a661d MG |
643 | * One per migratetype for each PAGE_ALLOC_COSTLY_ORDER. One additional list |
644 | * for THP which will usually be GFP_MOVABLE. Even if it is another type, | |
645 | * it should not contribute to serious fragmentation causing THP allocation | |
646 | * failures. | |
44042b44 MG |
647 | */ |
648 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
649 | #define NR_PCP_THP 1 | |
650 | #else | |
651 | #define NR_PCP_THP 0 | |
652 | #endif | |
5d0a661d MG |
653 | #define NR_LOWORDER_PCP_LISTS (MIGRATE_PCPTYPES * (PAGE_ALLOC_COSTLY_ORDER + 1)) |
654 | #define NR_PCP_LISTS (NR_LOWORDER_PCP_LISTS + NR_PCP_THP) | |
44042b44 | 655 | |
1c30844d MG |
656 | #define min_wmark_pages(z) (z->_watermark[WMARK_MIN] + z->watermark_boost) |
657 | #define low_wmark_pages(z) (z->_watermark[WMARK_LOW] + z->watermark_boost) | |
658 | #define high_wmark_pages(z) (z->_watermark[WMARK_HIGH] + z->watermark_boost) | |
659 | #define wmark_pages(z, i) (z->_watermark[i] + z->watermark_boost) | |
41858966 | 660 | |
dbbee9d5 | 661 | /* Fields and list protected by pagesets local_lock in page_alloc.c */ |
1da177e4 | 662 | struct per_cpu_pages { |
4b23a68f | 663 | spinlock_t lock; /* Protects lists field */ |
1da177e4 | 664 | int count; /* number of pages in the list */ |
1da177e4 LT |
665 | int high; /* high watermark, emptying needed */ |
666 | int batch; /* chunk size for buddy add/remove */ | |
3b12e7e9 | 667 | short free_factor; /* batch scaling factor during free */ |
28f836b6 | 668 | #ifdef CONFIG_NUMA |
3b12e7e9 | 669 | short expire; /* When 0, remote pagesets are drained */ |
28f836b6 | 670 | #endif |
5f8dcc21 MG |
671 | |
672 | /* Lists of pages, one per migrate type stored on the pcp-lists */ | |
44042b44 | 673 | struct list_head lists[NR_PCP_LISTS]; |
5d0a661d | 674 | } ____cacheline_aligned_in_smp; |
1da177e4 | 675 | |
28f836b6 | 676 | struct per_cpu_zonestat { |
2244b95a CL |
677 | #ifdef CONFIG_SMP |
678 | s8 vm_stat_diff[NR_VM_ZONE_STAT_ITEMS]; | |
28f836b6 MG |
679 | s8 stat_threshold; |
680 | #endif | |
681 | #ifdef CONFIG_NUMA | |
f19298b9 MG |
682 | /* |
683 | * Low priority inaccurate counters that are only folded | |
684 | * on demand. Use a large type to avoid the overhead of | |
685 | * folding during refresh_cpu_vm_stats. | |
686 | */ | |
687 | unsigned long vm_numa_event[NR_VM_NUMA_EVENT_ITEMS]; | |
2244b95a | 688 | #endif |
99dcc3e5 | 689 | }; |
e7c8d5c9 | 690 | |
75ef7184 MG |
691 | struct per_cpu_nodestat { |
692 | s8 stat_threshold; | |
693 | s8 vm_node_stat_diff[NR_VM_NODE_STAT_ITEMS]; | |
694 | }; | |
695 | ||
97965478 CL |
696 | #endif /* !__GENERATING_BOUNDS.H */ |
697 | ||
2f1b6248 CL |
698 | enum zone_type { |
699 | /* | |
734f9246 NSJ |
700 | * ZONE_DMA and ZONE_DMA32 are used when there are peripherals not able |
701 | * to DMA to all of the addressable memory (ZONE_NORMAL). | |
702 | * On architectures where this area covers the whole 32 bit address | |
703 | * space ZONE_DMA32 is used. ZONE_DMA is left for the ones with smaller | |
704 | * DMA addressing constraints. This distinction is important as a 32bit | |
705 | * DMA mask is assumed when ZONE_DMA32 is defined. Some 64-bit | |
706 | * platforms may need both zones as they support peripherals with | |
707 | * different DMA addressing limitations. | |
2f1b6248 | 708 | */ |
734f9246 | 709 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 710 | ZONE_DMA, |
4b51d669 | 711 | #endif |
fb0e7942 | 712 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 713 | ZONE_DMA32, |
fb0e7942 | 714 | #endif |
2f1b6248 CL |
715 | /* |
716 | * Normal addressable memory is in ZONE_NORMAL. DMA operations can be | |
717 | * performed on pages in ZONE_NORMAL if the DMA devices support | |
718 | * transfers to all addressable memory. | |
719 | */ | |
720 | ZONE_NORMAL, | |
e53ef38d | 721 | #ifdef CONFIG_HIGHMEM |
2f1b6248 CL |
722 | /* |
723 | * A memory area that is only addressable by the kernel through | |
724 | * mapping portions into its own address space. This is for example | |
725 | * used by i386 to allow the kernel to address the memory beyond | |
726 | * 900MB. The kernel will set up special mappings (page | |
727 | * table entries on i386) for each page that the kernel needs to | |
728 | * access. | |
729 | */ | |
730 | ZONE_HIGHMEM, | |
e53ef38d | 731 | #endif |
9181a980 DH |
732 | /* |
733 | * ZONE_MOVABLE is similar to ZONE_NORMAL, except that it contains | |
734 | * movable pages with few exceptional cases described below. Main use | |
735 | * cases for ZONE_MOVABLE are to make memory offlining/unplug more | |
736 | * likely to succeed, and to locally limit unmovable allocations - e.g., | |
737 | * to increase the number of THP/huge pages. Notable special cases are: | |
738 | * | |
739 | * 1. Pinned pages: (long-term) pinning of movable pages might | |
d1e153fe PT |
740 | * essentially turn such pages unmovable. Therefore, we do not allow |
741 | * pinning long-term pages in ZONE_MOVABLE. When pages are pinned and | |
742 | * faulted, they come from the right zone right away. However, it is | |
743 | * still possible that address space already has pages in | |
744 | * ZONE_MOVABLE at the time when pages are pinned (i.e. user has | |
745 | * touches that memory before pinning). In such case we migrate them | |
746 | * to a different zone. When migration fails - pinning fails. | |
9181a980 DH |
747 | * 2. memblock allocations: kernelcore/movablecore setups might create |
748 | * situations where ZONE_MOVABLE contains unmovable allocations | |
749 | * after boot. Memory offlining and allocations fail early. | |
750 | * 3. Memory holes: kernelcore/movablecore setups might create very rare | |
751 | * situations where ZONE_MOVABLE contains memory holes after boot, | |
752 | * for example, if we have sections that are only partially | |
753 | * populated. Memory offlining and allocations fail early. | |
754 | * 4. PG_hwpoison pages: while poisoned pages can be skipped during | |
755 | * memory offlining, such pages cannot be allocated. | |
756 | * 5. Unmovable PG_offline pages: in paravirtualized environments, | |
757 | * hotplugged memory blocks might only partially be managed by the | |
758 | * buddy (e.g., via XEN-balloon, Hyper-V balloon, virtio-mem). The | |
759 | * parts not manged by the buddy are unmovable PG_offline pages. In | |
760 | * some cases (virtio-mem), such pages can be skipped during | |
761 | * memory offlining, however, cannot be moved/allocated. These | |
762 | * techniques might use alloc_contig_range() to hide previously | |
763 | * exposed pages from the buddy again (e.g., to implement some sort | |
764 | * of memory unplug in virtio-mem). | |
9afaf30f PT |
765 | * 6. ZERO_PAGE(0), kernelcore/movablecore setups might create |
766 | * situations where ZERO_PAGE(0) which is allocated differently | |
767 | * on different platforms may end up in a movable zone. ZERO_PAGE(0) | |
768 | * cannot be migrated. | |
a08a2ae3 OS |
769 | * 7. Memory-hotplug: when using memmap_on_memory and onlining the |
770 | * memory to the MOVABLE zone, the vmemmap pages are also placed in | |
771 | * such zone. Such pages cannot be really moved around as they are | |
772 | * self-stored in the range, but they are treated as movable when | |
773 | * the range they describe is about to be offlined. | |
9181a980 DH |
774 | * |
775 | * In general, no unmovable allocations that degrade memory offlining | |
776 | * should end up in ZONE_MOVABLE. Allocators (like alloc_contig_range()) | |
777 | * have to expect that migrating pages in ZONE_MOVABLE can fail (even | |
778 | * if has_unmovable_pages() states that there are no unmovable pages, | |
779 | * there can be false negatives). | |
780 | */ | |
2a1e274a | 781 | ZONE_MOVABLE, |
033fbae9 DW |
782 | #ifdef CONFIG_ZONE_DEVICE |
783 | ZONE_DEVICE, | |
784 | #endif | |
97965478 | 785 | __MAX_NR_ZONES |
033fbae9 | 786 | |
2f1b6248 | 787 | }; |
1da177e4 | 788 | |
97965478 CL |
789 | #ifndef __GENERATING_BOUNDS_H |
790 | ||
ed017373 YZ |
791 | #define ASYNC_AND_SYNC 2 |
792 | ||
1da177e4 | 793 | struct zone { |
3484b2de | 794 | /* Read-mostly fields */ |
41858966 MG |
795 | |
796 | /* zone watermarks, access with *_wmark_pages(zone) macros */ | |
a9214443 | 797 | unsigned long _watermark[NR_WMARK]; |
1c30844d | 798 | unsigned long watermark_boost; |
41858966 | 799 | |
0aaa29a5 MG |
800 | unsigned long nr_reserved_highatomic; |
801 | ||
1da177e4 | 802 | /* |
89903327 AM |
803 | * We don't know if the memory that we're going to allocate will be |
804 | * freeable or/and it will be released eventually, so to avoid totally | |
805 | * wasting several GB of ram we must reserve some of the lower zone | |
806 | * memory (otherwise we risk to run OOM on the lower zones despite | |
807 | * there being tons of freeable ram on the higher zones). This array is | |
808 | * recalculated at runtime if the sysctl_lowmem_reserve_ratio sysctl | |
809 | * changes. | |
1da177e4 | 810 | */ |
3484b2de | 811 | long lowmem_reserve[MAX_NR_ZONES]; |
ab8fabd4 | 812 | |
e7c8d5c9 | 813 | #ifdef CONFIG_NUMA |
d5f541ed | 814 | int node; |
3484b2de | 815 | #endif |
3484b2de | 816 | struct pglist_data *zone_pgdat; |
28f836b6 MG |
817 | struct per_cpu_pages __percpu *per_cpu_pageset; |
818 | struct per_cpu_zonestat __percpu *per_cpu_zonestats; | |
952eaf81 VB |
819 | /* |
820 | * the high and batch values are copied to individual pagesets for | |
821 | * faster access | |
822 | */ | |
823 | int pageset_high; | |
824 | int pageset_batch; | |
3484b2de | 825 | |
835c134e MG |
826 | #ifndef CONFIG_SPARSEMEM |
827 | /* | |
d9c23400 | 828 | * Flags for a pageblock_nr_pages block. See pageblock-flags.h. |
835c134e MG |
829 | * In SPARSEMEM, this map is stored in struct mem_section |
830 | */ | |
831 | unsigned long *pageblock_flags; | |
832 | #endif /* CONFIG_SPARSEMEM */ | |
833 | ||
1da177e4 LT |
834 | /* zone_start_pfn == zone_start_paddr >> PAGE_SHIFT */ |
835 | unsigned long zone_start_pfn; | |
836 | ||
bdc8cb98 | 837 | /* |
9feedc9d JL |
838 | * spanned_pages is the total pages spanned by the zone, including |
839 | * holes, which is calculated as: | |
840 | * spanned_pages = zone_end_pfn - zone_start_pfn; | |
bdc8cb98 | 841 | * |
9feedc9d JL |
842 | * present_pages is physical pages existing within the zone, which |
843 | * is calculated as: | |
8761e31c | 844 | * present_pages = spanned_pages - absent_pages(pages in holes); |
9feedc9d | 845 | * |
4b097002 DH |
846 | * present_early_pages is present pages existing within the zone |
847 | * located on memory available since early boot, excluding hotplugged | |
848 | * memory. | |
849 | * | |
9feedc9d JL |
850 | * managed_pages is present pages managed by the buddy system, which |
851 | * is calculated as (reserved_pages includes pages allocated by the | |
852 | * bootmem allocator): | |
853 | * managed_pages = present_pages - reserved_pages; | |
854 | * | |
3c381db1 DH |
855 | * cma pages is present pages that are assigned for CMA use |
856 | * (MIGRATE_CMA). | |
857 | * | |
9feedc9d JL |
858 | * So present_pages may be used by memory hotplug or memory power |
859 | * management logic to figure out unmanaged pages by checking | |
860 | * (present_pages - managed_pages). And managed_pages should be used | |
861 | * by page allocator and vm scanner to calculate all kinds of watermarks | |
862 | * and thresholds. | |
863 | * | |
864 | * Locking rules: | |
865 | * | |
866 | * zone_start_pfn and spanned_pages are protected by span_seqlock. | |
867 | * It is a seqlock because it has to be read outside of zone->lock, | |
868 | * and it is done in the main allocator path. But, it is written | |
869 | * quite infrequently. | |
870 | * | |
871 | * The span_seq lock is declared along with zone->lock because it is | |
bdc8cb98 DH |
872 | * frequently read in proximity to zone->lock. It's good to |
873 | * give them a chance of being in the same cacheline. | |
9feedc9d | 874 | * |
c3d5f5f0 | 875 | * Write access to present_pages at runtime should be protected by |
e8da368a YZL |
876 | * mem_hotplug_begin/done(). Any reader who can't tolerant drift of |
877 | * present_pages should use get_online_mems() to get a stable value. | |
bdc8cb98 | 878 | */ |
9705bea5 | 879 | atomic_long_t managed_pages; |
9feedc9d JL |
880 | unsigned long spanned_pages; |
881 | unsigned long present_pages; | |
4b097002 DH |
882 | #if defined(CONFIG_MEMORY_HOTPLUG) |
883 | unsigned long present_early_pages; | |
884 | #endif | |
3c381db1 DH |
885 | #ifdef CONFIG_CMA |
886 | unsigned long cma_pages; | |
887 | #endif | |
3484b2de MG |
888 | |
889 | const char *name; | |
1da177e4 | 890 | |
ad53f92e JK |
891 | #ifdef CONFIG_MEMORY_ISOLATION |
892 | /* | |
893 | * Number of isolated pageblock. It is used to solve incorrect | |
894 | * freepage counting problem due to racy retrieving migratetype | |
895 | * of pageblock. Protected by zone->lock. | |
896 | */ | |
897 | unsigned long nr_isolate_pageblock; | |
898 | #endif | |
899 | ||
3484b2de MG |
900 | #ifdef CONFIG_MEMORY_HOTPLUG |
901 | /* see spanned/present_pages for more description */ | |
902 | seqlock_t span_seqlock; | |
903 | #endif | |
904 | ||
9dcb8b68 | 905 | int initialized; |
3484b2de | 906 | |
0f661148 | 907 | /* Write-intensive fields used from the page allocator */ |
e6ad640b | 908 | CACHELINE_PADDING(_pad1_); |
0f661148 | 909 | |
3484b2de | 910 | /* free areas of different sizes */ |
23baf831 | 911 | struct free_area free_area[MAX_ORDER + 1]; |
3484b2de MG |
912 | |
913 | /* zone flags, see below */ | |
914 | unsigned long flags; | |
915 | ||
0f661148 | 916 | /* Primarily protects free_area */ |
a368ab67 MG |
917 | spinlock_t lock; |
918 | ||
0f661148 | 919 | /* Write-intensive fields used by compaction and vmstats. */ |
e6ad640b | 920 | CACHELINE_PADDING(_pad2_); |
3484b2de | 921 | |
3484b2de MG |
922 | /* |
923 | * When free pages are below this point, additional steps are taken | |
924 | * when reading the number of free pages to avoid per-cpu counter | |
925 | * drift allowing watermarks to be breached | |
926 | */ | |
927 | unsigned long percpu_drift_mark; | |
928 | ||
929 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA | |
930 | /* pfn where compaction free scanner should start */ | |
931 | unsigned long compact_cached_free_pfn; | |
ed017373 YZ |
932 | /* pfn where compaction migration scanner should start */ |
933 | unsigned long compact_cached_migrate_pfn[ASYNC_AND_SYNC]; | |
e332f741 MG |
934 | unsigned long compact_init_migrate_pfn; |
935 | unsigned long compact_init_free_pfn; | |
3484b2de MG |
936 | #endif |
937 | ||
938 | #ifdef CONFIG_COMPACTION | |
939 | /* | |
940 | * On compaction failure, 1<<compact_defer_shift compactions | |
941 | * are skipped before trying again. The number attempted since | |
942 | * last failure is tracked with compact_considered. | |
860b3272 | 943 | * compact_order_failed is the minimum compaction failed order. |
3484b2de MG |
944 | */ |
945 | unsigned int compact_considered; | |
946 | unsigned int compact_defer_shift; | |
947 | int compact_order_failed; | |
948 | #endif | |
949 | ||
950 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA | |
951 | /* Set to true when the PG_migrate_skip bits should be cleared */ | |
952 | bool compact_blockskip_flush; | |
953 | #endif | |
954 | ||
7cf91a98 JK |
955 | bool contiguous; |
956 | ||
e6ad640b | 957 | CACHELINE_PADDING(_pad3_); |
3484b2de MG |
958 | /* Zone statistics */ |
959 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
f19298b9 | 960 | atomic_long_t vm_numa_event[NR_VM_NUMA_EVENT_ITEMS]; |
22fc6ecc | 961 | } ____cacheline_internodealigned_in_smp; |
1da177e4 | 962 | |
599d0c95 | 963 | enum pgdat_flags { |
599d0c95 | 964 | PGDAT_DIRTY, /* reclaim scanning has recently found |
d43006d5 MG |
965 | * many dirty file pages at the tail |
966 | * of the LRU. | |
967 | */ | |
599d0c95 | 968 | PGDAT_WRITEBACK, /* reclaim scanning has recently found |
283aba9f MG |
969 | * many pages under writeback |
970 | */ | |
a5f5f91d | 971 | PGDAT_RECLAIM_LOCKED, /* prevents concurrent reclaim */ |
57054651 | 972 | }; |
e815af95 | 973 | |
73444bc4 MG |
974 | enum zone_flags { |
975 | ZONE_BOOSTED_WATERMARK, /* zone recently boosted watermarks. | |
976 | * Cleared when kswapd is woken. | |
977 | */ | |
c49c2c47 | 978 | ZONE_RECLAIM_ACTIVE, /* kswapd may be scanning the zone. */ |
73444bc4 MG |
979 | }; |
980 | ||
9705bea5 AK |
981 | static inline unsigned long zone_managed_pages(struct zone *zone) |
982 | { | |
983 | return (unsigned long)atomic_long_read(&zone->managed_pages); | |
984 | } | |
985 | ||
3c381db1 DH |
986 | static inline unsigned long zone_cma_pages(struct zone *zone) |
987 | { | |
988 | #ifdef CONFIG_CMA | |
989 | return zone->cma_pages; | |
990 | #else | |
991 | return 0; | |
992 | #endif | |
993 | } | |
994 | ||
f9228b20 | 995 | static inline unsigned long zone_end_pfn(const struct zone *zone) |
108bcc96 CS |
996 | { |
997 | return zone->zone_start_pfn + zone->spanned_pages; | |
998 | } | |
999 | ||
1000 | static inline bool zone_spans_pfn(const struct zone *zone, unsigned long pfn) | |
1001 | { | |
1002 | return zone->zone_start_pfn <= pfn && pfn < zone_end_pfn(zone); | |
1003 | } | |
1004 | ||
2a6e3ebe CS |
1005 | static inline bool zone_is_initialized(struct zone *zone) |
1006 | { | |
9dcb8b68 | 1007 | return zone->initialized; |
2a6e3ebe CS |
1008 | } |
1009 | ||
1010 | static inline bool zone_is_empty(struct zone *zone) | |
1011 | { | |
1012 | return zone->spanned_pages == 0; | |
1013 | } | |
1014 | ||
5bb88dc5 AS |
1015 | #ifndef BUILD_VDSO32_64 |
1016 | /* | |
1017 | * The zone field is never updated after free_area_init_core() | |
1018 | * sets it, so none of the operations on it need to be atomic. | |
1019 | */ | |
1020 | ||
1021 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ | |
1022 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) | |
1023 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) | |
1024 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
1025 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) | |
1026 | #define KASAN_TAG_PGOFF (LAST_CPUPID_PGOFF - KASAN_TAG_WIDTH) | |
ec1c86b2 YZ |
1027 | #define LRU_GEN_PGOFF (KASAN_TAG_PGOFF - LRU_GEN_WIDTH) |
1028 | #define LRU_REFS_PGOFF (LRU_GEN_PGOFF - LRU_REFS_WIDTH) | |
5bb88dc5 AS |
1029 | |
1030 | /* | |
1031 | * Define the bit shifts to access each section. For non-existent | |
1032 | * sections we define the shift as 0; that plus a 0 mask ensures | |
1033 | * the compiler will optimise away reference to them. | |
1034 | */ | |
1035 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) | |
1036 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
1037 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
1038 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) | |
1039 | #define KASAN_TAG_PGSHIFT (KASAN_TAG_PGOFF * (KASAN_TAG_WIDTH != 0)) | |
1040 | ||
1041 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ | |
1042 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
1043 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) | |
1044 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF) ? \ | |
1045 | SECTIONS_PGOFF : ZONES_PGOFF) | |
1046 | #else | |
1047 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) | |
1048 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF) ? \ | |
1049 | NODES_PGOFF : ZONES_PGOFF) | |
1050 | #endif | |
1051 | ||
1052 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) | |
1053 | ||
1054 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) | |
1055 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
1056 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
1057 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) | |
1058 | #define KASAN_TAG_MASK ((1UL << KASAN_TAG_WIDTH) - 1) | |
1059 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) | |
1060 | ||
1061 | static inline enum zone_type page_zonenum(const struct page *page) | |
1062 | { | |
1063 | ASSERT_EXCLUSIVE_BITS(page->flags, ZONES_MASK << ZONES_PGSHIFT); | |
1064 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; | |
1065 | } | |
1066 | ||
1067 | static inline enum zone_type folio_zonenum(const struct folio *folio) | |
1068 | { | |
1069 | return page_zonenum(&folio->page); | |
1070 | } | |
1071 | ||
1072 | #ifdef CONFIG_ZONE_DEVICE | |
1073 | static inline bool is_zone_device_page(const struct page *page) | |
1074 | { | |
1075 | return page_zonenum(page) == ZONE_DEVICE; | |
1076 | } | |
49580e69 LG |
1077 | |
1078 | /* | |
1079 | * Consecutive zone device pages should not be merged into the same sgl | |
1080 | * or bvec segment with other types of pages or if they belong to different | |
1081 | * pgmaps. Otherwise getting the pgmap of a given segment is not possible | |
1082 | * without scanning the entire segment. This helper returns true either if | |
1083 | * both pages are not zone device pages or both pages are zone device pages | |
1084 | * with the same pgmap. | |
1085 | */ | |
1086 | static inline bool zone_device_pages_have_same_pgmap(const struct page *a, | |
1087 | const struct page *b) | |
1088 | { | |
1089 | if (is_zone_device_page(a) != is_zone_device_page(b)) | |
1090 | return false; | |
1091 | if (!is_zone_device_page(a)) | |
1092 | return true; | |
1093 | return a->pgmap == b->pgmap; | |
1094 | } | |
1095 | ||
5bb88dc5 AS |
1096 | extern void memmap_init_zone_device(struct zone *, unsigned long, |
1097 | unsigned long, struct dev_pagemap *); | |
1098 | #else | |
1099 | static inline bool is_zone_device_page(const struct page *page) | |
1100 | { | |
1101 | return false; | |
1102 | } | |
49580e69 LG |
1103 | static inline bool zone_device_pages_have_same_pgmap(const struct page *a, |
1104 | const struct page *b) | |
1105 | { | |
1106 | return true; | |
1107 | } | |
5bb88dc5 AS |
1108 | #endif |
1109 | ||
1110 | static inline bool folio_is_zone_device(const struct folio *folio) | |
1111 | { | |
1112 | return is_zone_device_page(&folio->page); | |
1113 | } | |
1114 | ||
1115 | static inline bool is_zone_movable_page(const struct page *page) | |
1116 | { | |
1117 | return page_zonenum(page) == ZONE_MOVABLE; | |
1118 | } | |
1119 | #endif | |
1120 | ||
f1dd2cd1 MH |
1121 | /* |
1122 | * Return true if [start_pfn, start_pfn + nr_pages) range has a non-empty | |
1123 | * intersection with the given zone | |
1124 | */ | |
1125 | static inline bool zone_intersects(struct zone *zone, | |
1126 | unsigned long start_pfn, unsigned long nr_pages) | |
1127 | { | |
1128 | if (zone_is_empty(zone)) | |
1129 | return false; | |
1130 | if (start_pfn >= zone_end_pfn(zone) || | |
1131 | start_pfn + nr_pages <= zone->zone_start_pfn) | |
1132 | return false; | |
1133 | ||
1134 | return true; | |
1135 | } | |
1136 | ||
1da177e4 LT |
1137 | /* |
1138 | * The "priority" of VM scanning is how much of the queues we will scan in one | |
1139 | * go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the | |
1140 | * queues ("queue_length >> 12") during an aging round. | |
1141 | */ | |
1142 | #define DEF_PRIORITY 12 | |
1143 | ||
9276b1bc PJ |
1144 | /* Maximum number of zones on a zonelist */ |
1145 | #define MAX_ZONES_PER_ZONELIST (MAX_NUMNODES * MAX_NR_ZONES) | |
1146 | ||
c00eb15a YB |
1147 | enum { |
1148 | ZONELIST_FALLBACK, /* zonelist with fallback */ | |
9276b1bc | 1149 | #ifdef CONFIG_NUMA |
c00eb15a YB |
1150 | /* |
1151 | * The NUMA zonelists are doubled because we need zonelists that | |
1152 | * restrict the allocations to a single node for __GFP_THISNODE. | |
1153 | */ | |
1154 | ZONELIST_NOFALLBACK, /* zonelist without fallback (__GFP_THISNODE) */ | |
9276b1bc | 1155 | #endif |
c00eb15a YB |
1156 | MAX_ZONELISTS |
1157 | }; | |
9276b1bc | 1158 | |
dd1a239f MG |
1159 | /* |
1160 | * This struct contains information about a zone in a zonelist. It is stored | |
1161 | * here to avoid dereferences into large structures and lookups of tables | |
1162 | */ | |
1163 | struct zoneref { | |
1164 | struct zone *zone; /* Pointer to actual zone */ | |
1165 | int zone_idx; /* zone_idx(zoneref->zone) */ | |
1166 | }; | |
1167 | ||
1da177e4 LT |
1168 | /* |
1169 | * One allocation request operates on a zonelist. A zonelist | |
1170 | * is a list of zones, the first one is the 'goal' of the | |
1171 | * allocation, the other zones are fallback zones, in decreasing | |
1172 | * priority. | |
1173 | * | |
dd1a239f MG |
1174 | * To speed the reading of the zonelist, the zonerefs contain the zone index |
1175 | * of the entry being read. Helper functions to access information given | |
1176 | * a struct zoneref are | |
1177 | * | |
1178 | * zonelist_zone() - Return the struct zone * for an entry in _zonerefs | |
1179 | * zonelist_zone_idx() - Return the index of the zone for an entry | |
1180 | * zonelist_node_idx() - Return the index of the node for an entry | |
1da177e4 LT |
1181 | */ |
1182 | struct zonelist { | |
dd1a239f | 1183 | struct zoneref _zonerefs[MAX_ZONES_PER_ZONELIST + 1]; |
1da177e4 LT |
1184 | }; |
1185 | ||
bb1c50d3 MR |
1186 | /* |
1187 | * The array of struct pages for flatmem. | |
1188 | * It must be declared for SPARSEMEM as well because there are configurations | |
1189 | * that rely on that. | |
1190 | */ | |
5b99cd0e | 1191 | extern struct page *mem_map; |
5b99cd0e | 1192 | |
364c1eeb YS |
1193 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1194 | struct deferred_split { | |
1195 | spinlock_t split_queue_lock; | |
1196 | struct list_head split_queue; | |
1197 | unsigned long split_queue_len; | |
1198 | }; | |
1199 | #endif | |
1200 | ||
44b8f8bf JY |
1201 | #ifdef CONFIG_MEMORY_FAILURE |
1202 | /* | |
1203 | * Per NUMA node memory failure handling statistics. | |
1204 | */ | |
1205 | struct memory_failure_stats { | |
1206 | /* | |
1207 | * Number of raw pages poisoned. | |
1208 | * Cases not accounted: memory outside kernel control, offline page, | |
1209 | * arch-specific memory_failure (SGX), hwpoison_filter() filtered | |
1210 | * error events, and unpoison actions from hwpoison_unpoison. | |
1211 | */ | |
1212 | unsigned long total; | |
1213 | /* | |
1214 | * Recovery results of poisoned raw pages handled by memory_failure, | |
1215 | * in sync with mf_result. | |
1216 | * total = ignored + failed + delayed + recovered. | |
1217 | * total * PAGE_SIZE * #nodes = /proc/meminfo/HardwareCorrupted. | |
1218 | */ | |
1219 | unsigned long ignored; | |
1220 | unsigned long failed; | |
1221 | unsigned long delayed; | |
1222 | unsigned long recovered; | |
1223 | }; | |
1224 | #endif | |
1225 | ||
1da177e4 | 1226 | /* |
1da177e4 | 1227 | * On NUMA machines, each NUMA node would have a pg_data_t to describe |
618b8c20 NB |
1228 | * it's memory layout. On UMA machines there is a single pglist_data which |
1229 | * describes the whole memory. | |
1da177e4 LT |
1230 | * |
1231 | * Memory statistics and page replacement data structures are maintained on a | |
1232 | * per-zone basis. | |
1233 | */ | |
1da177e4 | 1234 | typedef struct pglist_data { |
496df3d3 BW |
1235 | /* |
1236 | * node_zones contains just the zones for THIS node. Not all of the | |
1237 | * zones may be populated, but it is the full list. It is referenced by | |
1238 | * this node's node_zonelists as well as other node's node_zonelists. | |
1239 | */ | |
1da177e4 | 1240 | struct zone node_zones[MAX_NR_ZONES]; |
496df3d3 BW |
1241 | |
1242 | /* | |
1243 | * node_zonelists contains references to all zones in all nodes. | |
1244 | * Generally the first zones will be references to this node's | |
1245 | * node_zones. | |
1246 | */ | |
523b9458 | 1247 | struct zonelist node_zonelists[MAX_ZONELISTS]; |
496df3d3 BW |
1248 | |
1249 | int nr_zones; /* number of populated zones in this node */ | |
43b02ba9 | 1250 | #ifdef CONFIG_FLATMEM /* means !SPARSEMEM */ |
1da177e4 | 1251 | struct page *node_mem_map; |
eefa864b JK |
1252 | #ifdef CONFIG_PAGE_EXTENSION |
1253 | struct page_ext *node_page_ext; | |
1254 | #endif | |
d41dee36 | 1255 | #endif |
3a2d7fa8 | 1256 | #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) |
208d54e5 | 1257 | /* |
fa004ab7 WY |
1258 | * Must be held any time you expect node_start_pfn, |
1259 | * node_present_pages, node_spanned_pages or nr_zones to stay constant. | |
3d060856 PT |
1260 | * Also synchronizes pgdat->first_deferred_pfn during deferred page |
1261 | * init. | |
208d54e5 | 1262 | * |
114d4b79 | 1263 | * pgdat_resize_lock() and pgdat_resize_unlock() are provided to |
3a2d7fa8 PT |
1264 | * manipulate node_size_lock without checking for CONFIG_MEMORY_HOTPLUG |
1265 | * or CONFIG_DEFERRED_STRUCT_PAGE_INIT. | |
114d4b79 | 1266 | * |
72c3b51b | 1267 | * Nests above zone->lock and zone->span_seqlock |
208d54e5 DH |
1268 | */ |
1269 | spinlock_t node_size_lock; | |
1270 | #endif | |
1da177e4 LT |
1271 | unsigned long node_start_pfn; |
1272 | unsigned long node_present_pages; /* total number of physical pages */ | |
1273 | unsigned long node_spanned_pages; /* total size of physical page | |
1274 | range, including holes */ | |
1275 | int node_id; | |
1da177e4 | 1276 | wait_queue_head_t kswapd_wait; |
5515061d | 1277 | wait_queue_head_t pfmemalloc_wait; |
8cd7c588 MG |
1278 | |
1279 | /* workqueues for throttling reclaim for different reasons. */ | |
1280 | wait_queue_head_t reclaim_wait[NR_VMSCAN_THROTTLE]; | |
1281 | ||
1282 | atomic_t nr_writeback_throttled;/* nr of writeback-throttled tasks */ | |
1283 | unsigned long nr_reclaim_start; /* nr pages written while throttled | |
1284 | * when throttling started. */ | |
b4a0215e KW |
1285 | #ifdef CONFIG_MEMORY_HOTPLUG |
1286 | struct mutex kswapd_lock; | |
1287 | #endif | |
1288 | struct task_struct *kswapd; /* Protected by kswapd_lock */ | |
38087d9b | 1289 | int kswapd_order; |
97a225e6 | 1290 | enum zone_type kswapd_highest_zoneidx; |
38087d9b | 1291 | |
c73322d0 JW |
1292 | int kswapd_failures; /* Number of 'reclaimed == 0' runs */ |
1293 | ||
698b1b30 VB |
1294 | #ifdef CONFIG_COMPACTION |
1295 | int kcompactd_max_order; | |
97a225e6 | 1296 | enum zone_type kcompactd_highest_zoneidx; |
698b1b30 VB |
1297 | wait_queue_head_t kcompactd_wait; |
1298 | struct task_struct *kcompactd; | |
65d759c8 | 1299 | bool proactive_compact_trigger; |
8177a420 | 1300 | #endif |
281e3726 MG |
1301 | /* |
1302 | * This is a per-node reserve of pages that are not available | |
1303 | * to userspace allocations. | |
1304 | */ | |
1305 | unsigned long totalreserve_pages; | |
1306 | ||
a5f5f91d MG |
1307 | #ifdef CONFIG_NUMA |
1308 | /* | |
0a3c5772 | 1309 | * node reclaim becomes active if more unmapped pages exist. |
a5f5f91d MG |
1310 | */ |
1311 | unsigned long min_unmapped_pages; | |
1312 | unsigned long min_slab_pages; | |
1313 | #endif /* CONFIG_NUMA */ | |
1314 | ||
a52633d8 | 1315 | /* Write-intensive fields used by page reclaim */ |
e6ad640b | 1316 | CACHELINE_PADDING(_pad1_); |
3a80a7fa MG |
1317 | |
1318 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT | |
1319 | /* | |
1320 | * If memory initialisation on large machines is deferred then this | |
1321 | * is the first PFN that needs to be initialised. | |
1322 | */ | |
1323 | unsigned long first_deferred_pfn; | |
1324 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ | |
a3d0a918 KS |
1325 | |
1326 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
364c1eeb | 1327 | struct deferred_split deferred_split_queue; |
a3d0a918 | 1328 | #endif |
75ef7184 | 1329 | |
c6833e10 HY |
1330 | #ifdef CONFIG_NUMA_BALANCING |
1331 | /* start time in ms of current promote rate limit period */ | |
1332 | unsigned int nbp_rl_start; | |
1333 | /* number of promote candidate pages at start time of current rate limit period */ | |
1334 | unsigned long nbp_rl_nr_cand; | |
c959924b HY |
1335 | /* promote threshold in ms */ |
1336 | unsigned int nbp_threshold; | |
1337 | /* start time in ms of current promote threshold adjustment period */ | |
1338 | unsigned int nbp_th_start; | |
1339 | /* | |
c7cdf94e | 1340 | * number of promote candidate pages at start time of current promote |
c959924b HY |
1341 | * threshold adjustment period |
1342 | */ | |
1343 | unsigned long nbp_th_nr_cand; | |
c6833e10 | 1344 | #endif |
599d0c95 | 1345 | /* Fields commonly accessed by the page reclaim scanner */ |
867e5e1d JW |
1346 | |
1347 | /* | |
1348 | * NOTE: THIS IS UNUSED IF MEMCG IS ENABLED. | |
1349 | * | |
1350 | * Use mem_cgroup_lruvec() to look up lruvecs. | |
1351 | */ | |
1352 | struct lruvec __lruvec; | |
599d0c95 | 1353 | |
599d0c95 MG |
1354 | unsigned long flags; |
1355 | ||
bd74fdae YZ |
1356 | #ifdef CONFIG_LRU_GEN |
1357 | /* kswap mm walk data */ | |
9a52b2f3 | 1358 | struct lru_gen_mm_walk mm_walk; |
e4dde56c YZ |
1359 | /* lru_gen_folio list */ |
1360 | struct lru_gen_memcg memcg_lru; | |
bd74fdae YZ |
1361 | #endif |
1362 | ||
e6ad640b | 1363 | CACHELINE_PADDING(_pad2_); |
599d0c95 | 1364 | |
75ef7184 MG |
1365 | /* Per-node vmstats */ |
1366 | struct per_cpu_nodestat __percpu *per_cpu_nodestats; | |
1367 | atomic_long_t vm_stat[NR_VM_NODE_STAT_ITEMS]; | |
7766cf7a AK |
1368 | #ifdef CONFIG_NUMA |
1369 | struct memory_tier __rcu *memtier; | |
1370 | #endif | |
44b8f8bf JY |
1371 | #ifdef CONFIG_MEMORY_FAILURE |
1372 | struct memory_failure_stats mf_stats; | |
1373 | #endif | |
1da177e4 LT |
1374 | } pg_data_t; |
1375 | ||
1376 | #define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages) | |
1377 | #define node_spanned_pages(nid) (NODE_DATA(nid)->node_spanned_pages) | |
1378 | ||
c6830c22 | 1379 | #define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn) |
da3649e1 | 1380 | #define node_end_pfn(nid) pgdat_end_pfn(NODE_DATA(nid)) |
c6830c22 | 1381 | |
da3649e1 CS |
1382 | static inline unsigned long pgdat_end_pfn(pg_data_t *pgdat) |
1383 | { | |
1384 | return pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
1385 | } | |
1386 | ||
208d54e5 DH |
1387 | #include <linux/memory_hotplug.h> |
1388 | ||
72675e13 | 1389 | void build_all_zonelists(pg_data_t *pgdat); |
5ecd9d40 | 1390 | void wakeup_kswapd(struct zone *zone, gfp_t gfp_mask, int order, |
97a225e6 | 1391 | enum zone_type highest_zoneidx); |
86a294a8 | 1392 | bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
97a225e6 | 1393 | int highest_zoneidx, unsigned int alloc_flags, |
86a294a8 | 1394 | long free_pages); |
7aeb09f9 | 1395 | bool zone_watermark_ok(struct zone *z, unsigned int order, |
97a225e6 | 1396 | unsigned long mark, int highest_zoneidx, |
c603844b | 1397 | unsigned int alloc_flags); |
7aeb09f9 | 1398 | bool zone_watermark_ok_safe(struct zone *z, unsigned int order, |
97a225e6 | 1399 | unsigned long mark, int highest_zoneidx); |
c1d0da83 LD |
1400 | /* |
1401 | * Memory initialization context, use to differentiate memory added by | |
1402 | * the platform statically or via memory hotplug interface. | |
1403 | */ | |
1404 | enum meminit_context { | |
1405 | MEMINIT_EARLY, | |
1406 | MEMINIT_HOTPLUG, | |
a2f3aa02 | 1407 | }; |
c1d0da83 | 1408 | |
dc0bbf3b | 1409 | extern void init_currently_empty_zone(struct zone *zone, unsigned long start_pfn, |
b171e409 | 1410 | unsigned long size); |
718127cc | 1411 | |
bea8c150 | 1412 | extern void lruvec_init(struct lruvec *lruvec); |
7f5e86c2 | 1413 | |
599d0c95 | 1414 | static inline struct pglist_data *lruvec_pgdat(struct lruvec *lruvec) |
7f5e86c2 | 1415 | { |
c255a458 | 1416 | #ifdef CONFIG_MEMCG |
599d0c95 | 1417 | return lruvec->pgdat; |
7f5e86c2 | 1418 | #else |
867e5e1d | 1419 | return container_of(lruvec, struct pglist_data, __lruvec); |
7f5e86c2 KK |
1420 | #endif |
1421 | } | |
1422 | ||
7aac7898 LS |
1423 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
1424 | int local_memory_node(int node_id); | |
1425 | #else | |
1426 | static inline int local_memory_node(int node_id) { return node_id; }; | |
1427 | #endif | |
1428 | ||
1da177e4 LT |
1429 | /* |
1430 | * zone_idx() returns 0 for the ZONE_DMA zone, 1 for the ZONE_NORMAL zone, etc. | |
1431 | */ | |
1432 | #define zone_idx(zone) ((zone) - (zone)->zone_pgdat->node_zones) | |
1433 | ||
1f90a347 DW |
1434 | #ifdef CONFIG_ZONE_DEVICE |
1435 | static inline bool zone_is_zone_device(struct zone *zone) | |
1436 | { | |
1437 | return zone_idx(zone) == ZONE_DEVICE; | |
1438 | } | |
1439 | #else | |
1440 | static inline bool zone_is_zone_device(struct zone *zone) | |
1441 | { | |
1442 | return false; | |
1443 | } | |
1444 | #endif | |
1445 | ||
6aa303de MG |
1446 | /* |
1447 | * Returns true if a zone has pages managed by the buddy allocator. | |
1448 | * All the reclaim decisions have to use this function rather than | |
1449 | * populated_zone(). If the whole zone is reserved then we can easily | |
1450 | * end up with populated_zone() && !managed_zone(). | |
1451 | */ | |
1452 | static inline bool managed_zone(struct zone *zone) | |
1453 | { | |
9705bea5 | 1454 | return zone_managed_pages(zone); |
6aa303de MG |
1455 | } |
1456 | ||
1457 | /* Returns true if a zone has memory */ | |
1458 | static inline bool populated_zone(struct zone *zone) | |
f3fe6512 | 1459 | { |
6aa303de | 1460 | return zone->present_pages; |
f3fe6512 CK |
1461 | } |
1462 | ||
c1093b74 PT |
1463 | #ifdef CONFIG_NUMA |
1464 | static inline int zone_to_nid(struct zone *zone) | |
1465 | { | |
1466 | return zone->node; | |
1467 | } | |
1468 | ||
1469 | static inline void zone_set_nid(struct zone *zone, int nid) | |
1470 | { | |
1471 | zone->node = nid; | |
1472 | } | |
1473 | #else | |
1474 | static inline int zone_to_nid(struct zone *zone) | |
1475 | { | |
1476 | return 0; | |
1477 | } | |
1478 | ||
1479 | static inline void zone_set_nid(struct zone *zone, int nid) {} | |
1480 | #endif | |
1481 | ||
2a1e274a MG |
1482 | extern int movable_zone; |
1483 | ||
2f1b6248 | 1484 | static inline int is_highmem_idx(enum zone_type idx) |
1da177e4 | 1485 | { |
e53ef38d | 1486 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 1487 | return (idx == ZONE_HIGHMEM || |
b19bd1c9 | 1488 | (idx == ZONE_MOVABLE && movable_zone == ZONE_HIGHMEM)); |
e53ef38d CL |
1489 | #else |
1490 | return 0; | |
1491 | #endif | |
1da177e4 LT |
1492 | } |
1493 | ||
1da177e4 | 1494 | /** |
b4a991ec | 1495 | * is_highmem - helper function to quickly check if a struct zone is a |
1da177e4 LT |
1496 | * highmem zone or not. This is an attempt to keep references |
1497 | * to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum. | |
198fba41 MR |
1498 | * @zone: pointer to struct zone variable |
1499 | * Return: 1 for a highmem zone, 0 otherwise | |
1da177e4 LT |
1500 | */ |
1501 | static inline int is_highmem(struct zone *zone) | |
1502 | { | |
29f9cb53 | 1503 | return is_highmem_idx(zone_idx(zone)); |
bb077c3f KW |
1504 | } |
1505 | ||
1506 | #ifdef CONFIG_ZONE_DMA | |
1507 | bool has_managed_dma(void); | |
e53ef38d | 1508 | #else |
bb077c3f KW |
1509 | static inline bool has_managed_dma(void) |
1510 | { | |
1511 | return false; | |
1da177e4 | 1512 | } |
bb077c3f | 1513 | #endif |
1da177e4 | 1514 | |
1da177e4 LT |
1515 | /* These two functions are used to setup the per zone pages min values */ |
1516 | struct ctl_table; | |
2374c09b | 1517 | |
32927393 CH |
1518 | int min_free_kbytes_sysctl_handler(struct ctl_table *, int, void *, size_t *, |
1519 | loff_t *); | |
1520 | int watermark_scale_factor_sysctl_handler(struct ctl_table *, int, void *, | |
1521 | size_t *, loff_t *); | |
d3cda233 | 1522 | extern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES]; |
32927393 CH |
1523 | int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *, int, void *, |
1524 | size_t *, loff_t *); | |
74f44822 MG |
1525 | int percpu_pagelist_high_fraction_sysctl_handler(struct ctl_table *, int, |
1526 | void *, size_t *, loff_t *); | |
9614634f | 1527 | int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *, int, |
32927393 | 1528 | void *, size_t *, loff_t *); |
0ff38490 | 1529 | int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *, int, |
32927393 CH |
1530 | void *, size_t *, loff_t *); |
1531 | int numa_zonelist_order_handler(struct ctl_table *, int, | |
1532 | void *, size_t *, loff_t *); | |
74f44822 | 1533 | extern int percpu_pagelist_high_fraction; |
f0c0b2b8 | 1534 | extern char numa_zonelist_order[]; |
c9bff3ee | 1535 | #define NUMA_ZONELIST_ORDER_LEN 16 |
f0c0b2b8 | 1536 | |
a9ee6cf5 | 1537 | #ifndef CONFIG_NUMA |
1da177e4 LT |
1538 | |
1539 | extern struct pglist_data contig_page_data; | |
351de44f MG |
1540 | static inline struct pglist_data *NODE_DATA(int nid) |
1541 | { | |
1542 | return &contig_page_data; | |
1543 | } | |
1da177e4 | 1544 | |
a9ee6cf5 | 1545 | #else /* CONFIG_NUMA */ |
1da177e4 LT |
1546 | |
1547 | #include <asm/mmzone.h> | |
1548 | ||
a9ee6cf5 | 1549 | #endif /* !CONFIG_NUMA */ |
348f8b6c | 1550 | |
95144c78 KH |
1551 | extern struct pglist_data *first_online_pgdat(void); |
1552 | extern struct pglist_data *next_online_pgdat(struct pglist_data *pgdat); | |
1553 | extern struct zone *next_zone(struct zone *zone); | |
8357f869 KH |
1554 | |
1555 | /** | |
12d15f0d | 1556 | * for_each_online_pgdat - helper macro to iterate over all online nodes |
198fba41 | 1557 | * @pgdat: pointer to a pg_data_t variable |
8357f869 KH |
1558 | */ |
1559 | #define for_each_online_pgdat(pgdat) \ | |
1560 | for (pgdat = first_online_pgdat(); \ | |
1561 | pgdat; \ | |
1562 | pgdat = next_online_pgdat(pgdat)) | |
8357f869 KH |
1563 | /** |
1564 | * for_each_zone - helper macro to iterate over all memory zones | |
198fba41 | 1565 | * @zone: pointer to struct zone variable |
8357f869 KH |
1566 | * |
1567 | * The user only needs to declare the zone variable, for_each_zone | |
1568 | * fills it in. | |
1569 | */ | |
1570 | #define for_each_zone(zone) \ | |
1571 | for (zone = (first_online_pgdat())->node_zones; \ | |
1572 | zone; \ | |
1573 | zone = next_zone(zone)) | |
1574 | ||
ee99c71c KM |
1575 | #define for_each_populated_zone(zone) \ |
1576 | for (zone = (first_online_pgdat())->node_zones; \ | |
1577 | zone; \ | |
1578 | zone = next_zone(zone)) \ | |
1579 | if (!populated_zone(zone)) \ | |
1580 | ; /* do nothing */ \ | |
1581 | else | |
1582 | ||
dd1a239f MG |
1583 | static inline struct zone *zonelist_zone(struct zoneref *zoneref) |
1584 | { | |
1585 | return zoneref->zone; | |
1586 | } | |
1587 | ||
1588 | static inline int zonelist_zone_idx(struct zoneref *zoneref) | |
1589 | { | |
1590 | return zoneref->zone_idx; | |
1591 | } | |
1592 | ||
1593 | static inline int zonelist_node_idx(struct zoneref *zoneref) | |
1594 | { | |
c1093b74 | 1595 | return zone_to_nid(zoneref->zone); |
dd1a239f MG |
1596 | } |
1597 | ||
682a3385 MG |
1598 | struct zoneref *__next_zones_zonelist(struct zoneref *z, |
1599 | enum zone_type highest_zoneidx, | |
1600 | nodemask_t *nodes); | |
1601 | ||
19770b32 MG |
1602 | /** |
1603 | * next_zones_zonelist - Returns the next zone at or below highest_zoneidx within the allowed nodemask using a cursor within a zonelist as a starting point | |
198fba41 MR |
1604 | * @z: The cursor used as a starting point for the search |
1605 | * @highest_zoneidx: The zone index of the highest zone to return | |
1606 | * @nodes: An optional nodemask to filter the zonelist with | |
19770b32 MG |
1607 | * |
1608 | * This function returns the next zone at or below a given zone index that is | |
1609 | * within the allowed nodemask using a cursor as the starting point for the | |
5bead2a0 MG |
1610 | * search. The zoneref returned is a cursor that represents the current zone |
1611 | * being examined. It should be advanced by one before calling | |
1612 | * next_zones_zonelist again. | |
198fba41 MR |
1613 | * |
1614 | * Return: the next zone at or below highest_zoneidx within the allowed | |
1615 | * nodemask using a cursor within a zonelist as a starting point | |
19770b32 | 1616 | */ |
682a3385 | 1617 | static __always_inline struct zoneref *next_zones_zonelist(struct zoneref *z, |
19770b32 | 1618 | enum zone_type highest_zoneidx, |
682a3385 MG |
1619 | nodemask_t *nodes) |
1620 | { | |
1621 | if (likely(!nodes && zonelist_zone_idx(z) <= highest_zoneidx)) | |
1622 | return z; | |
1623 | return __next_zones_zonelist(z, highest_zoneidx, nodes); | |
1624 | } | |
dd1a239f | 1625 | |
19770b32 MG |
1626 | /** |
1627 | * first_zones_zonelist - Returns the first zone at or below highest_zoneidx within the allowed nodemask in a zonelist | |
198fba41 MR |
1628 | * @zonelist: The zonelist to search for a suitable zone |
1629 | * @highest_zoneidx: The zone index of the highest zone to return | |
1630 | * @nodes: An optional nodemask to filter the zonelist with | |
19770b32 MG |
1631 | * |
1632 | * This function returns the first zone at or below a given zone index that is | |
1633 | * within the allowed nodemask. The zoneref returned is a cursor that can be | |
5bead2a0 MG |
1634 | * used to iterate the zonelist with next_zones_zonelist by advancing it by |
1635 | * one before calling. | |
ea57485a VB |
1636 | * |
1637 | * When no eligible zone is found, zoneref->zone is NULL (zoneref itself is | |
1638 | * never NULL). This may happen either genuinely, or due to concurrent nodemask | |
1639 | * update due to cpuset modification. | |
198fba41 MR |
1640 | * |
1641 | * Return: Zoneref pointer for the first suitable zone found | |
19770b32 | 1642 | */ |
dd1a239f | 1643 | static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist, |
19770b32 | 1644 | enum zone_type highest_zoneidx, |
c33d6c06 | 1645 | nodemask_t *nodes) |
54a6eb5c | 1646 | { |
c33d6c06 | 1647 | return next_zones_zonelist(zonelist->_zonerefs, |
05891fb0 | 1648 | highest_zoneidx, nodes); |
54a6eb5c MG |
1649 | } |
1650 | ||
19770b32 MG |
1651 | /** |
1652 | * for_each_zone_zonelist_nodemask - helper macro to iterate over valid zones in a zonelist at or below a given zone index and within a nodemask | |
198fba41 MR |
1653 | * @zone: The current zone in the iterator |
1654 | * @z: The current pointer within zonelist->_zonerefs being iterated | |
1655 | * @zlist: The zonelist being iterated | |
1656 | * @highidx: The zone index of the highest zone to return | |
1657 | * @nodemask: Nodemask allowed by the allocator | |
19770b32 MG |
1658 | * |
1659 | * This iterator iterates though all zones at or below a given zone index and | |
1660 | * within a given nodemask | |
1661 | */ | |
1662 | #define for_each_zone_zonelist_nodemask(zone, z, zlist, highidx, nodemask) \ | |
c33d6c06 | 1663 | for (z = first_zones_zonelist(zlist, highidx, nodemask), zone = zonelist_zone(z); \ |
19770b32 | 1664 | zone; \ |
05891fb0 | 1665 | z = next_zones_zonelist(++z, highidx, nodemask), \ |
c33d6c06 MG |
1666 | zone = zonelist_zone(z)) |
1667 | ||
30d8ec73 | 1668 | #define for_next_zone_zonelist_nodemask(zone, z, highidx, nodemask) \ |
c33d6c06 MG |
1669 | for (zone = z->zone; \ |
1670 | zone; \ | |
1671 | z = next_zones_zonelist(++z, highidx, nodemask), \ | |
1672 | zone = zonelist_zone(z)) | |
1673 | ||
54a6eb5c MG |
1674 | |
1675 | /** | |
1676 | * for_each_zone_zonelist - helper macro to iterate over valid zones in a zonelist at or below a given zone index | |
198fba41 MR |
1677 | * @zone: The current zone in the iterator |
1678 | * @z: The current pointer within zonelist->zones being iterated | |
1679 | * @zlist: The zonelist being iterated | |
1680 | * @highidx: The zone index of the highest zone to return | |
54a6eb5c MG |
1681 | * |
1682 | * This iterator iterates though all zones at or below a given zone index. | |
1683 | */ | |
1684 | #define for_each_zone_zonelist(zone, z, zlist, highidx) \ | |
19770b32 | 1685 | for_each_zone_zonelist_nodemask(zone, z, zlist, highidx, NULL) |
54a6eb5c | 1686 | |
8ca1b5a4 FT |
1687 | /* Whether the 'nodes' are all movable nodes */ |
1688 | static inline bool movable_only_nodes(nodemask_t *nodes) | |
1689 | { | |
1690 | struct zonelist *zonelist; | |
1691 | struct zoneref *z; | |
1692 | int nid; | |
1693 | ||
1694 | if (nodes_empty(*nodes)) | |
1695 | return false; | |
1696 | ||
1697 | /* | |
1698 | * We can chose arbitrary node from the nodemask to get a | |
1699 | * zonelist as they are interlinked. We just need to find | |
1700 | * at least one zone that can satisfy kernel allocations. | |
1701 | */ | |
1702 | nid = first_node(*nodes); | |
1703 | zonelist = &NODE_DATA(nid)->node_zonelists[ZONELIST_FALLBACK]; | |
1704 | z = first_zones_zonelist(zonelist, ZONE_NORMAL, nodes); | |
1705 | return (!z->zone) ? true : false; | |
1706 | } | |
1707 | ||
1708 | ||
d41dee36 AW |
1709 | #ifdef CONFIG_SPARSEMEM |
1710 | #include <asm/sparsemem.h> | |
1711 | #endif | |
1712 | ||
2bdaf115 AW |
1713 | #ifdef CONFIG_FLATMEM |
1714 | #define pfn_to_nid(pfn) (0) | |
1715 | #endif | |
1716 | ||
d41dee36 AW |
1717 | #ifdef CONFIG_SPARSEMEM |
1718 | ||
1719 | /* | |
d41dee36 AW |
1720 | * PA_SECTION_SHIFT physical address to/from section number |
1721 | * PFN_SECTION_SHIFT pfn to/from section number | |
1722 | */ | |
d41dee36 AW |
1723 | #define PA_SECTION_SHIFT (SECTION_SIZE_BITS) |
1724 | #define PFN_SECTION_SHIFT (SECTION_SIZE_BITS - PAGE_SHIFT) | |
1725 | ||
1726 | #define NR_MEM_SECTIONS (1UL << SECTIONS_SHIFT) | |
1727 | ||
1728 | #define PAGES_PER_SECTION (1UL << PFN_SECTION_SHIFT) | |
1729 | #define PAGE_SECTION_MASK (~(PAGES_PER_SECTION-1)) | |
1730 | ||
835c134e | 1731 | #define SECTION_BLOCKFLAGS_BITS \ |
d9c23400 | 1732 | ((1UL << (PFN_SECTION_SHIFT - pageblock_order)) * NR_PAGEBLOCK_BITS) |
835c134e | 1733 | |
23baf831 | 1734 | #if (MAX_ORDER + PAGE_SHIFT) > SECTION_SIZE_BITS |
d41dee36 AW |
1735 | #error Allocator MAX_ORDER exceeds SECTION_SIZE |
1736 | #endif | |
1737 | ||
1dd2bfc8 YI |
1738 | static inline unsigned long pfn_to_section_nr(unsigned long pfn) |
1739 | { | |
1740 | return pfn >> PFN_SECTION_SHIFT; | |
1741 | } | |
1742 | static inline unsigned long section_nr_to_pfn(unsigned long sec) | |
1743 | { | |
1744 | return sec << PFN_SECTION_SHIFT; | |
1745 | } | |
e3c40f37 | 1746 | |
a539f353 DK |
1747 | #define SECTION_ALIGN_UP(pfn) (((pfn) + PAGES_PER_SECTION - 1) & PAGE_SECTION_MASK) |
1748 | #define SECTION_ALIGN_DOWN(pfn) ((pfn) & PAGE_SECTION_MASK) | |
1749 | ||
f1eca35a | 1750 | #define SUBSECTION_SHIFT 21 |
9ffc1d19 | 1751 | #define SUBSECTION_SIZE (1UL << SUBSECTION_SHIFT) |
f1eca35a DW |
1752 | |
1753 | #define PFN_SUBSECTION_SHIFT (SUBSECTION_SHIFT - PAGE_SHIFT) | |
1754 | #define PAGES_PER_SUBSECTION (1UL << PFN_SUBSECTION_SHIFT) | |
1755 | #define PAGE_SUBSECTION_MASK (~(PAGES_PER_SUBSECTION-1)) | |
1756 | ||
1757 | #if SUBSECTION_SHIFT > SECTION_SIZE_BITS | |
1758 | #error Subsection size exceeds section size | |
1759 | #else | |
1760 | #define SUBSECTIONS_PER_SECTION (1UL << (SECTION_SIZE_BITS - SUBSECTION_SHIFT)) | |
1761 | #endif | |
1762 | ||
a3619190 DW |
1763 | #define SUBSECTION_ALIGN_UP(pfn) ALIGN((pfn), PAGES_PER_SUBSECTION) |
1764 | #define SUBSECTION_ALIGN_DOWN(pfn) ((pfn) & PAGE_SUBSECTION_MASK) | |
1765 | ||
f1eca35a | 1766 | struct mem_section_usage { |
0a9f9f62 | 1767 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
f1eca35a | 1768 | DECLARE_BITMAP(subsection_map, SUBSECTIONS_PER_SECTION); |
0a9f9f62 | 1769 | #endif |
f1eca35a DW |
1770 | /* See declaration of similar field in struct zone */ |
1771 | unsigned long pageblock_flags[0]; | |
1772 | }; | |
1773 | ||
f46edbd1 DW |
1774 | void subsection_map_init(unsigned long pfn, unsigned long nr_pages); |
1775 | ||
d41dee36 | 1776 | struct page; |
eefa864b | 1777 | struct page_ext; |
d41dee36 | 1778 | struct mem_section { |
29751f69 AW |
1779 | /* |
1780 | * This is, logically, a pointer to an array of struct | |
1781 | * pages. However, it is stored with some other magic. | |
1782 | * (see sparse.c::sparse_init_one_section()) | |
1783 | * | |
30c253e6 AW |
1784 | * Additionally during early boot we encode node id of |
1785 | * the location of the section here to guide allocation. | |
1786 | * (see sparse.c::memory_present()) | |
1787 | * | |
29751f69 AW |
1788 | * Making it a UL at least makes someone do a cast |
1789 | * before using it wrong. | |
1790 | */ | |
1791 | unsigned long section_mem_map; | |
5c0e3066 | 1792 | |
f1eca35a | 1793 | struct mem_section_usage *usage; |
eefa864b JK |
1794 | #ifdef CONFIG_PAGE_EXTENSION |
1795 | /* | |
0c9ad804 | 1796 | * If SPARSEMEM, pgdat doesn't have page_ext pointer. We use |
eefa864b JK |
1797 | * section. (see page_ext.h about this.) |
1798 | */ | |
1799 | struct page_ext *page_ext; | |
1800 | unsigned long pad; | |
1801 | #endif | |
55878e88 CS |
1802 | /* |
1803 | * WARNING: mem_section must be a power-of-2 in size for the | |
1804 | * calculation and use of SECTION_ROOT_MASK to make sense. | |
1805 | */ | |
d41dee36 AW |
1806 | }; |
1807 | ||
3e347261 BP |
1808 | #ifdef CONFIG_SPARSEMEM_EXTREME |
1809 | #define SECTIONS_PER_ROOT (PAGE_SIZE / sizeof (struct mem_section)) | |
1810 | #else | |
1811 | #define SECTIONS_PER_ROOT 1 | |
1812 | #endif | |
802f192e | 1813 | |
3e347261 | 1814 | #define SECTION_NR_TO_ROOT(sec) ((sec) / SECTIONS_PER_ROOT) |
0faa5638 | 1815 | #define NR_SECTION_ROOTS DIV_ROUND_UP(NR_MEM_SECTIONS, SECTIONS_PER_ROOT) |
3e347261 | 1816 | #define SECTION_ROOT_MASK (SECTIONS_PER_ROOT - 1) |
802f192e | 1817 | |
3e347261 | 1818 | #ifdef CONFIG_SPARSEMEM_EXTREME |
83e3c487 | 1819 | extern struct mem_section **mem_section; |
802f192e | 1820 | #else |
3e347261 BP |
1821 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]; |
1822 | #endif | |
d41dee36 | 1823 | |
f1eca35a DW |
1824 | static inline unsigned long *section_to_usemap(struct mem_section *ms) |
1825 | { | |
1826 | return ms->usage->pageblock_flags; | |
1827 | } | |
1828 | ||
29751f69 AW |
1829 | static inline struct mem_section *__nr_to_section(unsigned long nr) |
1830 | { | |
a431dbbc WL |
1831 | unsigned long root = SECTION_NR_TO_ROOT(nr); |
1832 | ||
1833 | if (unlikely(root >= NR_SECTION_ROOTS)) | |
1834 | return NULL; | |
1835 | ||
83e3c487 | 1836 | #ifdef CONFIG_SPARSEMEM_EXTREME |
a431dbbc | 1837 | if (!mem_section || !mem_section[root]) |
83e3c487 KS |
1838 | return NULL; |
1839 | #endif | |
a431dbbc | 1840 | return &mem_section[root][nr & SECTION_ROOT_MASK]; |
29751f69 | 1841 | } |
f1eca35a | 1842 | extern size_t mem_section_usage_size(void); |
29751f69 AW |
1843 | |
1844 | /* | |
1845 | * We use the lower bits of the mem_map pointer to store | |
def9b71e PT |
1846 | * a little bit of information. The pointer is calculated |
1847 | * as mem_map - section_nr_to_pfn(pnum). The result is | |
1848 | * aligned to the minimum alignment of the two values: | |
1849 | * 1. All mem_map arrays are page-aligned. | |
1850 | * 2. section_nr_to_pfn() always clears PFN_SECTION_SHIFT | |
1851 | * lowest bits. PFN_SECTION_SHIFT is arch-specific | |
1852 | * (equal SECTION_SIZE_BITS - PAGE_SHIFT), and the | |
1853 | * worst combination is powerpc with 256k pages, | |
1854 | * which results in PFN_SECTION_SHIFT equal 6. | |
ed7802dd MS |
1855 | * To sum it up, at least 6 bits are available on all architectures. |
1856 | * However, we can exceed 6 bits on some other architectures except | |
1857 | * powerpc (e.g. 15 bits are available on x86_64, 13 bits are available | |
1858 | * with the worst case of 64K pages on arm64) if we make sure the | |
1859 | * exceeded bit is not applicable to powerpc. | |
29751f69 | 1860 | */ |
ed7802dd MS |
1861 | enum { |
1862 | SECTION_MARKED_PRESENT_BIT, | |
1863 | SECTION_HAS_MEM_MAP_BIT, | |
1864 | SECTION_IS_ONLINE_BIT, | |
1865 | SECTION_IS_EARLY_BIT, | |
1866 | #ifdef CONFIG_ZONE_DEVICE | |
1867 | SECTION_TAINT_ZONE_DEVICE_BIT, | |
1868 | #endif | |
1869 | SECTION_MAP_LAST_BIT, | |
1870 | }; | |
1871 | ||
1872 | #define SECTION_MARKED_PRESENT BIT(SECTION_MARKED_PRESENT_BIT) | |
1873 | #define SECTION_HAS_MEM_MAP BIT(SECTION_HAS_MEM_MAP_BIT) | |
1874 | #define SECTION_IS_ONLINE BIT(SECTION_IS_ONLINE_BIT) | |
1875 | #define SECTION_IS_EARLY BIT(SECTION_IS_EARLY_BIT) | |
1876 | #ifdef CONFIG_ZONE_DEVICE | |
1877 | #define SECTION_TAINT_ZONE_DEVICE BIT(SECTION_TAINT_ZONE_DEVICE_BIT) | |
1878 | #endif | |
1879 | #define SECTION_MAP_MASK (~(BIT(SECTION_MAP_LAST_BIT) - 1)) | |
1880 | #define SECTION_NID_SHIFT SECTION_MAP_LAST_BIT | |
29751f69 AW |
1881 | |
1882 | static inline struct page *__section_mem_map_addr(struct mem_section *section) | |
1883 | { | |
1884 | unsigned long map = section->section_mem_map; | |
1885 | map &= SECTION_MAP_MASK; | |
1886 | return (struct page *)map; | |
1887 | } | |
1888 | ||
540557b9 | 1889 | static inline int present_section(struct mem_section *section) |
29751f69 | 1890 | { |
802f192e | 1891 | return (section && (section->section_mem_map & SECTION_MARKED_PRESENT)); |
29751f69 AW |
1892 | } |
1893 | ||
540557b9 AW |
1894 | static inline int present_section_nr(unsigned long nr) |
1895 | { | |
1896 | return present_section(__nr_to_section(nr)); | |
1897 | } | |
1898 | ||
1899 | static inline int valid_section(struct mem_section *section) | |
29751f69 | 1900 | { |
802f192e | 1901 | return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP)); |
29751f69 AW |
1902 | } |
1903 | ||
326e1b8f DW |
1904 | static inline int early_section(struct mem_section *section) |
1905 | { | |
1906 | return (section && (section->section_mem_map & SECTION_IS_EARLY)); | |
1907 | } | |
1908 | ||
29751f69 AW |
1909 | static inline int valid_section_nr(unsigned long nr) |
1910 | { | |
1911 | return valid_section(__nr_to_section(nr)); | |
1912 | } | |
1913 | ||
2d070eab MH |
1914 | static inline int online_section(struct mem_section *section) |
1915 | { | |
1916 | return (section && (section->section_mem_map & SECTION_IS_ONLINE)); | |
1917 | } | |
1918 | ||
ed7802dd | 1919 | #ifdef CONFIG_ZONE_DEVICE |
1f90a347 DW |
1920 | static inline int online_device_section(struct mem_section *section) |
1921 | { | |
1922 | unsigned long flags = SECTION_IS_ONLINE | SECTION_TAINT_ZONE_DEVICE; | |
1923 | ||
1924 | return section && ((section->section_mem_map & flags) == flags); | |
1925 | } | |
ed7802dd MS |
1926 | #else |
1927 | static inline int online_device_section(struct mem_section *section) | |
1928 | { | |
1929 | return 0; | |
1930 | } | |
1931 | #endif | |
1f90a347 | 1932 | |
2d070eab MH |
1933 | static inline int online_section_nr(unsigned long nr) |
1934 | { | |
1935 | return online_section(__nr_to_section(nr)); | |
1936 | } | |
1937 | ||
1938 | #ifdef CONFIG_MEMORY_HOTPLUG | |
1939 | void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn); | |
2d070eab MH |
1940 | void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn); |
1941 | #endif | |
2d070eab | 1942 | |
d41dee36 AW |
1943 | static inline struct mem_section *__pfn_to_section(unsigned long pfn) |
1944 | { | |
29751f69 | 1945 | return __nr_to_section(pfn_to_section_nr(pfn)); |
d41dee36 AW |
1946 | } |
1947 | ||
2491f0a2 | 1948 | extern unsigned long __highest_present_section_nr; |
c4e1be9e | 1949 | |
f46edbd1 DW |
1950 | static inline int subsection_map_index(unsigned long pfn) |
1951 | { | |
1952 | return (pfn & ~(PAGE_SECTION_MASK)) / PAGES_PER_SUBSECTION; | |
1953 | } | |
1954 | ||
1955 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
1956 | static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) | |
1957 | { | |
1958 | int idx = subsection_map_index(pfn); | |
1959 | ||
1960 | return test_bit(idx, ms->usage->subsection_map); | |
1961 | } | |
1962 | #else | |
1963 | static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) | |
1964 | { | |
1965 | return 1; | |
1966 | } | |
1967 | #endif | |
1968 | ||
7b7bf499 | 1969 | #ifndef CONFIG_HAVE_ARCH_PFN_VALID |
51c656ae MR |
1970 | /** |
1971 | * pfn_valid - check if there is a valid memory map entry for a PFN | |
1972 | * @pfn: the page frame number to check | |
1973 | * | |
1974 | * Check if there is a valid memory map entry aka struct page for the @pfn. | |
1975 | * Note, that availability of the memory map entry does not imply that | |
1976 | * there is actual usable memory at that @pfn. The struct page may | |
1977 | * represent a hole or an unusable page frame. | |
1978 | * | |
1979 | * Return: 1 for PFNs that have memory map entries and 0 otherwise | |
1980 | */ | |
d41dee36 AW |
1981 | static inline int pfn_valid(unsigned long pfn) |
1982 | { | |
f46edbd1 DW |
1983 | struct mem_section *ms; |
1984 | ||
16c9afc7 AK |
1985 | /* |
1986 | * Ensure the upper PAGE_SHIFT bits are clear in the | |
1987 | * pfn. Else it might lead to false positives when | |
1988 | * some of the upper bits are set, but the lower bits | |
1989 | * match a valid pfn. | |
1990 | */ | |
1991 | if (PHYS_PFN(PFN_PHYS(pfn)) != pfn) | |
1992 | return 0; | |
1993 | ||
d41dee36 AW |
1994 | if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) |
1995 | return 0; | |
f1dc0db2 | 1996 | ms = __pfn_to_section(pfn); |
f46edbd1 DW |
1997 | if (!valid_section(ms)) |
1998 | return 0; | |
1999 | /* | |
2000 | * Traditionally early sections always returned pfn_valid() for | |
2001 | * the entire section-sized span. | |
2002 | */ | |
2003 | return early_section(ms) || pfn_section_valid(ms, pfn); | |
d41dee36 | 2004 | } |
7b7bf499 | 2005 | #endif |
d41dee36 | 2006 | |
e03d1f78 | 2007 | static inline int pfn_in_present_section(unsigned long pfn) |
540557b9 AW |
2008 | { |
2009 | if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) | |
2010 | return 0; | |
f1dc0db2 | 2011 | return present_section(__pfn_to_section(pfn)); |
540557b9 AW |
2012 | } |
2013 | ||
4c605881 DH |
2014 | static inline unsigned long next_present_section_nr(unsigned long section_nr) |
2015 | { | |
2016 | while (++section_nr <= __highest_present_section_nr) { | |
2017 | if (present_section_nr(section_nr)) | |
2018 | return section_nr; | |
2019 | } | |
2020 | ||
2021 | return -1; | |
2022 | } | |
2023 | ||
d41dee36 AW |
2024 | /* |
2025 | * These are _only_ used during initialisation, therefore they | |
2026 | * can use __initdata ... They could have names to indicate | |
2027 | * this restriction. | |
2028 | */ | |
2029 | #ifdef CONFIG_NUMA | |
161599ff AW |
2030 | #define pfn_to_nid(pfn) \ |
2031 | ({ \ | |
2032 | unsigned long __pfn_to_nid_pfn = (pfn); \ | |
2033 | page_to_nid(pfn_to_page(__pfn_to_nid_pfn)); \ | |
2034 | }) | |
2bdaf115 AW |
2035 | #else |
2036 | #define pfn_to_nid(pfn) (0) | |
d41dee36 AW |
2037 | #endif |
2038 | ||
d41dee36 AW |
2039 | void sparse_init(void); |
2040 | #else | |
2041 | #define sparse_init() do {} while (0) | |
28ae55c9 | 2042 | #define sparse_index_init(_sec, _nid) do {} while (0) |
e03d1f78 | 2043 | #define pfn_in_present_section pfn_valid |
f46edbd1 | 2044 | #define subsection_map_init(_pfn, _nr_pages) do {} while (0) |
d41dee36 AW |
2045 | #endif /* CONFIG_SPARSEMEM */ |
2046 | ||
97965478 | 2047 | #endif /* !__GENERATING_BOUNDS.H */ |
1da177e4 | 2048 | #endif /* !__ASSEMBLY__ */ |
1da177e4 | 2049 | #endif /* _LINUX_MMZONE_H */ |