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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 | |
28fb54f6 VMO |
108 | #define folio_migratetype(folio) \ |
109 | get_pfnblock_flags_mask(&folio->page, folio_pfn(folio), \ | |
110 | MIGRATETYPE_MASK) | |
1da177e4 | 111 | struct free_area { |
b2a0ac88 | 112 | struct list_head free_list[MIGRATE_TYPES]; |
1da177e4 LT |
113 | unsigned long nr_free; |
114 | }; | |
115 | ||
116 | struct pglist_data; | |
117 | ||
3a321d2a KW |
118 | #ifdef CONFIG_NUMA |
119 | enum numa_stat_item { | |
120 | NUMA_HIT, /* allocated in intended node */ | |
121 | NUMA_MISS, /* allocated in non intended node */ | |
122 | NUMA_FOREIGN, /* was intended here, hit elsewhere */ | |
123 | NUMA_INTERLEAVE_HIT, /* interleaver preferred this zone */ | |
124 | NUMA_LOCAL, /* allocation from local node */ | |
125 | NUMA_OTHER, /* allocation from other node */ | |
f19298b9 | 126 | NR_VM_NUMA_EVENT_ITEMS |
3a321d2a KW |
127 | }; |
128 | #else | |
f19298b9 | 129 | #define NR_VM_NUMA_EVENT_ITEMS 0 |
3a321d2a KW |
130 | #endif |
131 | ||
2244b95a | 132 | enum zone_stat_item { |
51ed4491 | 133 | /* First 128 byte cacheline (assuming 64 bit words) */ |
d23ad423 | 134 | NR_FREE_PAGES, |
71c799f4 MK |
135 | NR_ZONE_LRU_BASE, /* Used only for compaction and reclaim retry */ |
136 | NR_ZONE_INACTIVE_ANON = NR_ZONE_LRU_BASE, | |
137 | NR_ZONE_ACTIVE_ANON, | |
138 | NR_ZONE_INACTIVE_FILE, | |
139 | NR_ZONE_ACTIVE_FILE, | |
140 | NR_ZONE_UNEVICTABLE, | |
5a1c84b4 | 141 | NR_ZONE_WRITE_PENDING, /* Count of dirty, writeback and unstable pages */ |
5344b7e6 | 142 | NR_MLOCK, /* mlock()ed pages found and moved off LRU */ |
c6a7f572 | 143 | /* Second 128 byte cacheline */ |
d2c5e30c | 144 | NR_BOUNCE, |
91537fee MK |
145 | #if IS_ENABLED(CONFIG_ZSMALLOC) |
146 | NR_ZSPAGES, /* allocated in zsmalloc */ | |
ca889e6c | 147 | #endif |
d1ce749a | 148 | NR_FREE_CMA_PAGES, |
dcdfdd40 KS |
149 | #ifdef CONFIG_UNACCEPTED_MEMORY |
150 | NR_UNACCEPTED, | |
151 | #endif | |
2244b95a CL |
152 | NR_VM_ZONE_STAT_ITEMS }; |
153 | ||
75ef7184 | 154 | enum node_stat_item { |
599d0c95 MG |
155 | NR_LRU_BASE, |
156 | NR_INACTIVE_ANON = NR_LRU_BASE, /* must match order of LRU_[IN]ACTIVE */ | |
157 | NR_ACTIVE_ANON, /* " " " " " */ | |
158 | NR_INACTIVE_FILE, /* " " " " " */ | |
159 | NR_ACTIVE_FILE, /* " " " " " */ | |
160 | NR_UNEVICTABLE, /* " " " " " */ | |
d42f3245 RG |
161 | NR_SLAB_RECLAIMABLE_B, |
162 | NR_SLAB_UNRECLAIMABLE_B, | |
599d0c95 MG |
163 | NR_ISOLATED_ANON, /* Temporary isolated pages from anon lru */ |
164 | NR_ISOLATED_FILE, /* Temporary isolated pages from file lru */ | |
68d48e6a | 165 | WORKINGSET_NODES, |
170b04b7 JK |
166 | WORKINGSET_REFAULT_BASE, |
167 | WORKINGSET_REFAULT_ANON = WORKINGSET_REFAULT_BASE, | |
168 | WORKINGSET_REFAULT_FILE, | |
169 | WORKINGSET_ACTIVATE_BASE, | |
170 | WORKINGSET_ACTIVATE_ANON = WORKINGSET_ACTIVATE_BASE, | |
171 | WORKINGSET_ACTIVATE_FILE, | |
172 | WORKINGSET_RESTORE_BASE, | |
173 | WORKINGSET_RESTORE_ANON = WORKINGSET_RESTORE_BASE, | |
174 | WORKINGSET_RESTORE_FILE, | |
1e6b1085 | 175 | WORKINGSET_NODERECLAIM, |
4b9d0fab | 176 | NR_ANON_MAPPED, /* Mapped anonymous pages */ |
50658e2e MG |
177 | NR_FILE_MAPPED, /* pagecache pages mapped into pagetables. |
178 | only modified from process context */ | |
11fb9989 MG |
179 | NR_FILE_PAGES, |
180 | NR_FILE_DIRTY, | |
181 | NR_WRITEBACK, | |
182 | NR_WRITEBACK_TEMP, /* Writeback using temporary buffers */ | |
183 | NR_SHMEM, /* shmem pages (included tmpfs/GEM pages) */ | |
184 | NR_SHMEM_THPS, | |
185 | NR_SHMEM_PMDMAPPED, | |
60fbf0ab SL |
186 | NR_FILE_THPS, |
187 | NR_FILE_PMDMAPPED, | |
11fb9989 | 188 | NR_ANON_THPS, |
c4a25635 MG |
189 | NR_VMSCAN_WRITE, |
190 | NR_VMSCAN_IMMEDIATE, /* Prioritise for reclaim when writeback ends */ | |
191 | NR_DIRTIED, /* page dirtyings since bootup */ | |
192 | NR_WRITTEN, /* page writings since bootup */ | |
8cd7c588 | 193 | NR_THROTTLED_WRITTEN, /* NR_WRITTEN while reclaim throttled */ |
b29940c1 | 194 | NR_KERNEL_MISC_RECLAIMABLE, /* reclaimable non-slab kernel pages */ |
1970dc6f JH |
195 | NR_FOLL_PIN_ACQUIRED, /* via: pin_user_page(), gup flag: FOLL_PIN */ |
196 | NR_FOLL_PIN_RELEASED, /* pages returned via unpin_user_page() */ | |
991e7673 SB |
197 | NR_KERNEL_STACK_KB, /* measured in KiB */ |
198 | #if IS_ENABLED(CONFIG_SHADOW_CALL_STACK) | |
199 | NR_KERNEL_SCS_KB, /* measured in KiB */ | |
200 | #endif | |
f0c0c115 | 201 | NR_PAGETABLE, /* used for pagetables */ |
ebc97a52 | 202 | NR_SECONDARY_PAGETABLE, /* secondary pagetables, e.g. KVM pagetables */ |
b6038942 SB |
203 | #ifdef CONFIG_SWAP |
204 | NR_SWAPCACHE, | |
e39bb6be HY |
205 | #endif |
206 | #ifdef CONFIG_NUMA_BALANCING | |
207 | PGPROMOTE_SUCCESS, /* promote successfully */ | |
c6833e10 | 208 | PGPROMOTE_CANDIDATE, /* candidate pages to promote */ |
b6038942 | 209 | #endif |
75ef7184 MG |
210 | NR_VM_NODE_STAT_ITEMS |
211 | }; | |
212 | ||
69473e5d MS |
213 | /* |
214 | * Returns true if the item should be printed in THPs (/proc/vmstat | |
215 | * currently prints number of anon, file and shmem THPs. But the item | |
216 | * is charged in pages). | |
217 | */ | |
218 | static __always_inline bool vmstat_item_print_in_thp(enum node_stat_item item) | |
219 | { | |
220 | if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) | |
221 | return false; | |
222 | ||
bf9ecead | 223 | return item == NR_ANON_THPS || |
57b2847d | 224 | item == NR_FILE_THPS || |
a1528e21 | 225 | item == NR_SHMEM_THPS || |
380780e7 MS |
226 | item == NR_SHMEM_PMDMAPPED || |
227 | item == NR_FILE_PMDMAPPED; | |
69473e5d MS |
228 | } |
229 | ||
ea426c2a RG |
230 | /* |
231 | * Returns true if the value is measured in bytes (most vmstat values are | |
232 | * measured in pages). This defines the API part, the internal representation | |
233 | * might be different. | |
234 | */ | |
235 | static __always_inline bool vmstat_item_in_bytes(int idx) | |
236 | { | |
d42f3245 RG |
237 | /* |
238 | * Global and per-node slab counters track slab pages. | |
239 | * It's expected that changes are multiples of PAGE_SIZE. | |
240 | * Internally values are stored in pages. | |
241 | * | |
242 | * Per-memcg and per-lruvec counters track memory, consumed | |
243 | * by individual slab objects. These counters are actually | |
244 | * byte-precise. | |
245 | */ | |
246 | return (idx == NR_SLAB_RECLAIMABLE_B || | |
247 | idx == NR_SLAB_UNRECLAIMABLE_B); | |
ea426c2a RG |
248 | } |
249 | ||
4f98a2fe RR |
250 | /* |
251 | * We do arithmetic on the LRU lists in various places in the code, | |
252 | * so it is important to keep the active lists LRU_ACTIVE higher in | |
253 | * the array than the corresponding inactive lists, and to keep | |
254 | * the *_FILE lists LRU_FILE higher than the corresponding _ANON lists. | |
255 | * | |
256 | * This has to be kept in sync with the statistics in zone_stat_item | |
257 | * above and the descriptions in vmstat_text in mm/vmstat.c | |
258 | */ | |
259 | #define LRU_BASE 0 | |
260 | #define LRU_ACTIVE 1 | |
261 | #define LRU_FILE 2 | |
262 | ||
b69408e8 | 263 | enum lru_list { |
4f98a2fe RR |
264 | LRU_INACTIVE_ANON = LRU_BASE, |
265 | LRU_ACTIVE_ANON = LRU_BASE + LRU_ACTIVE, | |
266 | LRU_INACTIVE_FILE = LRU_BASE + LRU_FILE, | |
267 | LRU_ACTIVE_FILE = LRU_BASE + LRU_FILE + LRU_ACTIVE, | |
894bc310 | 268 | LRU_UNEVICTABLE, |
894bc310 LS |
269 | NR_LRU_LISTS |
270 | }; | |
b69408e8 | 271 | |
8cd7c588 MG |
272 | enum vmscan_throttle_state { |
273 | VMSCAN_THROTTLE_WRITEBACK, | |
d818fca1 | 274 | VMSCAN_THROTTLE_ISOLATED, |
69392a40 | 275 | VMSCAN_THROTTLE_NOPROGRESS, |
1b4e3f26 | 276 | VMSCAN_THROTTLE_CONGESTED, |
8cd7c588 MG |
277 | NR_VMSCAN_THROTTLE, |
278 | }; | |
279 | ||
4111304d | 280 | #define for_each_lru(lru) for (lru = 0; lru < NR_LRU_LISTS; lru++) |
b69408e8 | 281 | |
4111304d | 282 | #define for_each_evictable_lru(lru) for (lru = 0; lru <= LRU_ACTIVE_FILE; lru++) |
894bc310 | 283 | |
b91ac374 | 284 | static inline bool is_file_lru(enum lru_list lru) |
4f98a2fe | 285 | { |
4111304d | 286 | return (lru == LRU_INACTIVE_FILE || lru == LRU_ACTIVE_FILE); |
4f98a2fe RR |
287 | } |
288 | ||
b91ac374 | 289 | static inline bool is_active_lru(enum lru_list lru) |
b69408e8 | 290 | { |
4111304d | 291 | return (lru == LRU_ACTIVE_ANON || lru == LRU_ACTIVE_FILE); |
b69408e8 CL |
292 | } |
293 | ||
e9c2dbc8 YY |
294 | #define WORKINGSET_ANON 0 |
295 | #define WORKINGSET_FILE 1 | |
ed017373 YZ |
296 | #define ANON_AND_FILE 2 |
297 | ||
1b05117d | 298 | enum lruvec_flags { |
1bc545bf YA |
299 | /* |
300 | * An lruvec has many dirty pages backed by a congested BDI: | |
301 | * 1. LRUVEC_CGROUP_CONGESTED is set by cgroup-level reclaim. | |
302 | * It can be cleared by cgroup reclaim or kswapd. | |
303 | * 2. LRUVEC_NODE_CONGESTED is set by kswapd node-level reclaim. | |
304 | * It can only be cleared by kswapd. | |
305 | * | |
306 | * Essentially, kswapd can unthrottle an lruvec throttled by cgroup | |
307 | * reclaim, but not vice versa. This only applies to the root cgroup. | |
308 | * The goal is to prevent cgroup reclaim on the root cgroup (e.g. | |
309 | * memory.reclaim) to unthrottle an unbalanced node (that was throttled | |
310 | * by kswapd). | |
311 | */ | |
312 | LRUVEC_CGROUP_CONGESTED, | |
313 | LRUVEC_NODE_CONGESTED, | |
1b05117d JW |
314 | }; |
315 | ||
ec1c86b2 YZ |
316 | #endif /* !__GENERATING_BOUNDS_H */ |
317 | ||
318 | /* | |
319 | * Evictable pages are divided into multiple generations. The youngest and the | |
320 | * oldest generation numbers, max_seq and min_seq, are monotonically increasing. | |
321 | * They form a sliding window of a variable size [MIN_NR_GENS, MAX_NR_GENS]. An | |
322 | * offset within MAX_NR_GENS, i.e., gen, indexes the LRU list of the | |
323 | * corresponding generation. The gen counter in folio->flags stores gen+1 while | |
6df1b221 | 324 | * a page is on one of lrugen->folios[]. Otherwise it stores 0. |
ec1c86b2 YZ |
325 | * |
326 | * A page is added to the youngest generation on faulting. The aging needs to | |
327 | * check the accessed bit at least twice before handing this page over to the | |
328 | * eviction. The first check takes care of the accessed bit set on the initial | |
329 | * fault; the second check makes sure this page hasn't been used since then. | |
330 | * This process, AKA second chance, requires a minimum of two generations, | |
331 | * hence MIN_NR_GENS. And to maintain ABI compatibility with the active/inactive | |
332 | * LRU, e.g., /proc/vmstat, these two generations are considered active; the | |
333 | * rest of generations, if they exist, are considered inactive. See | |
334 | * lru_gen_is_active(). | |
335 | * | |
6df1b221 YZ |
336 | * PG_active is always cleared while a page is on one of lrugen->folios[] so |
337 | * that the aging needs not to worry about it. And it's set again when a page | |
ec1c86b2 YZ |
338 | * considered active is isolated for non-reclaiming purposes, e.g., migration. |
339 | * See lru_gen_add_folio() and lru_gen_del_folio(). | |
340 | * | |
341 | * MAX_NR_GENS is set to 4 so that the multi-gen LRU can support twice the | |
342 | * number of categories of the active/inactive LRU when keeping track of | |
343 | * accesses through page tables. This requires order_base_2(MAX_NR_GENS+1) bits | |
344 | * in folio->flags. | |
345 | */ | |
346 | #define MIN_NR_GENS 2U | |
347 | #define MAX_NR_GENS 4U | |
348 | ||
ac35a490 YZ |
349 | /* |
350 | * Each generation is divided into multiple tiers. A page accessed N times | |
351 | * through file descriptors is in tier order_base_2(N). A page in the first tier | |
352 | * (N=0,1) is marked by PG_referenced unless it was faulted in through page | |
353 | * tables or read ahead. A page in any other tier (N>1) is marked by | |
354 | * PG_referenced and PG_workingset. This implies a minimum of two tiers is | |
355 | * supported without using additional bits in folio->flags. | |
356 | * | |
357 | * In contrast to moving across generations which requires the LRU lock, moving | |
358 | * across tiers only involves atomic operations on folio->flags and therefore | |
359 | * has a negligible cost in the buffered access path. In the eviction path, | |
360 | * comparisons of refaulted/(evicted+protected) from the first tier and the | |
361 | * rest infer whether pages accessed multiple times through file descriptors | |
362 | * are statistically hot and thus worth protecting. | |
363 | * | |
364 | * MAX_NR_TIERS is set to 4 so that the multi-gen LRU can support twice the | |
365 | * number of categories of the active/inactive LRU when keeping track of | |
366 | * accesses through file descriptors. This uses MAX_NR_TIERS-2 spare bits in | |
367 | * folio->flags. | |
368 | */ | |
369 | #define MAX_NR_TIERS 4U | |
370 | ||
ec1c86b2 YZ |
371 | #ifndef __GENERATING_BOUNDS_H |
372 | ||
373 | struct lruvec; | |
018ee47f | 374 | struct page_vma_mapped_walk; |
ec1c86b2 YZ |
375 | |
376 | #define LRU_GEN_MASK ((BIT(LRU_GEN_WIDTH) - 1) << LRU_GEN_PGOFF) | |
377 | #define LRU_REFS_MASK ((BIT(LRU_REFS_WIDTH) - 1) << LRU_REFS_PGOFF) | |
378 | ||
379 | #ifdef CONFIG_LRU_GEN | |
380 | ||
381 | enum { | |
382 | LRU_GEN_ANON, | |
383 | LRU_GEN_FILE, | |
384 | }; | |
385 | ||
354ed597 YZ |
386 | enum { |
387 | LRU_GEN_CORE, | |
388 | LRU_GEN_MM_WALK, | |
389 | LRU_GEN_NONLEAF_YOUNG, | |
390 | NR_LRU_GEN_CAPS | |
391 | }; | |
392 | ||
ac35a490 YZ |
393 | #define MIN_LRU_BATCH BITS_PER_LONG |
394 | #define MAX_LRU_BATCH (MIN_LRU_BATCH * 64) | |
395 | ||
396 | /* whether to keep historical stats from evicted generations */ | |
397 | #ifdef CONFIG_LRU_GEN_STATS | |
398 | #define NR_HIST_GENS MAX_NR_GENS | |
399 | #else | |
400 | #define NR_HIST_GENS 1U | |
401 | #endif | |
402 | ||
ec1c86b2 YZ |
403 | /* |
404 | * The youngest generation number is stored in max_seq for both anon and file | |
405 | * types as they are aged on an equal footing. The oldest generation numbers are | |
406 | * stored in min_seq[] separately for anon and file types as clean file pages | |
407 | * can be evicted regardless of swap constraints. | |
408 | * | |
409 | * Normally anon and file min_seq are in sync. But if swapping is constrained, | |
410 | * e.g., out of swap space, file min_seq is allowed to advance and leave anon | |
411 | * min_seq behind. | |
412 | * | |
413 | * The number of pages in each generation is eventually consistent and therefore | |
bd74fdae | 414 | * can be transiently negative when reset_batch_size() is pending. |
ec1c86b2 | 415 | */ |
391655fe | 416 | struct lru_gen_folio { |
ec1c86b2 YZ |
417 | /* the aging increments the youngest generation number */ |
418 | unsigned long max_seq; | |
419 | /* the eviction increments the oldest generation numbers */ | |
420 | unsigned long min_seq[ANON_AND_FILE]; | |
1332a809 YZ |
421 | /* the birth time of each generation in jiffies */ |
422 | unsigned long timestamps[MAX_NR_GENS]; | |
ec1c86b2 | 423 | /* the multi-gen LRU lists, lazily sorted on eviction */ |
6df1b221 | 424 | struct list_head folios[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES]; |
ec1c86b2 YZ |
425 | /* the multi-gen LRU sizes, eventually consistent */ |
426 | long nr_pages[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES]; | |
ac35a490 YZ |
427 | /* the exponential moving average of refaulted */ |
428 | unsigned long avg_refaulted[ANON_AND_FILE][MAX_NR_TIERS]; | |
429 | /* the exponential moving average of evicted+protected */ | |
430 | unsigned long avg_total[ANON_AND_FILE][MAX_NR_TIERS]; | |
431 | /* the first tier doesn't need protection, hence the minus one */ | |
432 | unsigned long protected[NR_HIST_GENS][ANON_AND_FILE][MAX_NR_TIERS - 1]; | |
433 | /* can be modified without holding the LRU lock */ | |
434 | atomic_long_t evicted[NR_HIST_GENS][ANON_AND_FILE][MAX_NR_TIERS]; | |
435 | atomic_long_t refaulted[NR_HIST_GENS][ANON_AND_FILE][MAX_NR_TIERS]; | |
354ed597 YZ |
436 | /* whether the multi-gen LRU is enabled */ |
437 | bool enabled; | |
e4dde56c YZ |
438 | #ifdef CONFIG_MEMCG |
439 | /* the memcg generation this lru_gen_folio belongs to */ | |
440 | u8 gen; | |
441 | /* the list segment this lru_gen_folio belongs to */ | |
442 | u8 seg; | |
443 | /* per-node lru_gen_folio list for global reclaim */ | |
444 | struct hlist_nulls_node list; | |
445 | #endif | |
ec1c86b2 YZ |
446 | }; |
447 | ||
bd74fdae YZ |
448 | enum { |
449 | MM_LEAF_TOTAL, /* total leaf entries */ | |
450 | MM_LEAF_OLD, /* old leaf entries */ | |
451 | MM_LEAF_YOUNG, /* young leaf entries */ | |
452 | MM_NONLEAF_TOTAL, /* total non-leaf entries */ | |
453 | MM_NONLEAF_FOUND, /* non-leaf entries found in Bloom filters */ | |
454 | MM_NONLEAF_ADDED, /* non-leaf entries added to Bloom filters */ | |
455 | NR_MM_STATS | |
456 | }; | |
457 | ||
458 | /* double-buffering Bloom filters */ | |
459 | #define NR_BLOOM_FILTERS 2 | |
460 | ||
461 | struct lru_gen_mm_state { | |
462 | /* set to max_seq after each iteration */ | |
463 | unsigned long seq; | |
7f63cf2d | 464 | /* where the current iteration continues after */ |
bd74fdae | 465 | struct list_head *head; |
7f63cf2d | 466 | /* where the last iteration ended before */ |
bd74fdae | 467 | struct list_head *tail; |
bd74fdae YZ |
468 | /* Bloom filters flip after each iteration */ |
469 | unsigned long *filters[NR_BLOOM_FILTERS]; | |
470 | /* the mm stats for debugging */ | |
471 | unsigned long stats[NR_HIST_GENS][NR_MM_STATS]; | |
bd74fdae YZ |
472 | }; |
473 | ||
474 | struct lru_gen_mm_walk { | |
475 | /* the lruvec under reclaim */ | |
476 | struct lruvec *lruvec; | |
391655fe | 477 | /* unstable max_seq from lru_gen_folio */ |
bd74fdae YZ |
478 | unsigned long max_seq; |
479 | /* the next address within an mm to scan */ | |
480 | unsigned long next_addr; | |
481 | /* to batch promoted pages */ | |
482 | int nr_pages[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES]; | |
483 | /* to batch the mm stats */ | |
484 | int mm_stats[NR_MM_STATS]; | |
485 | /* total batched items */ | |
486 | int batched; | |
487 | bool can_swap; | |
488 | bool force_scan; | |
489 | }; | |
490 | ||
ec1c86b2 | 491 | void lru_gen_init_lruvec(struct lruvec *lruvec); |
018ee47f | 492 | void lru_gen_look_around(struct page_vma_mapped_walk *pvmw); |
ec1c86b2 YZ |
493 | |
494 | #ifdef CONFIG_MEMCG | |
e4dde56c YZ |
495 | |
496 | /* | |
497 | * For each node, memcgs are divided into two generations: the old and the | |
498 | * young. For each generation, memcgs are randomly sharded into multiple bins | |
499 | * to improve scalability. For each bin, the hlist_nulls is virtually divided | |
500 | * into three segments: the head, the tail and the default. | |
501 | * | |
502 | * An onlining memcg is added to the tail of a random bin in the old generation. | |
503 | * The eviction starts at the head of a random bin in the old generation. The | |
504 | * per-node memcg generation counter, whose reminder (mod MEMCG_NR_GENS) indexes | |
505 | * the old generation, is incremented when all its bins become empty. | |
506 | * | |
507 | * There are four operations: | |
508 | * 1. MEMCG_LRU_HEAD, which moves an memcg to the head of a random bin in its | |
509 | * current generation (old or young) and updates its "seg" to "head"; | |
510 | * 2. MEMCG_LRU_TAIL, which moves an memcg to the tail of a random bin in its | |
511 | * current generation (old or young) and updates its "seg" to "tail"; | |
512 | * 3. MEMCG_LRU_OLD, which moves an memcg to the head of a random bin in the old | |
513 | * generation, updates its "gen" to "old" and resets its "seg" to "default"; | |
514 | * 4. MEMCG_LRU_YOUNG, which moves an memcg to the tail of a random bin in the | |
515 | * young generation, updates its "gen" to "young" and resets its "seg" to | |
516 | * "default". | |
517 | * | |
518 | * The events that trigger the above operations are: | |
519 | * 1. Exceeding the soft limit, which triggers MEMCG_LRU_HEAD; | |
520 | * 2. The first attempt to reclaim an memcg below low, which triggers | |
521 | * MEMCG_LRU_TAIL; | |
522 | * 3. The first attempt to reclaim an memcg below reclaimable size threshold, | |
523 | * which triggers MEMCG_LRU_TAIL; | |
524 | * 4. The second attempt to reclaim an memcg below reclaimable size threshold, | |
525 | * which triggers MEMCG_LRU_YOUNG; | |
526 | * 5. Attempting to reclaim an memcg below min, which triggers MEMCG_LRU_YOUNG; | |
527 | * 6. Finishing the aging on the eviction path, which triggers MEMCG_LRU_YOUNG; | |
528 | * 7. Offlining an memcg, which triggers MEMCG_LRU_OLD. | |
529 | * | |
530 | * Note that memcg LRU only applies to global reclaim, and the round-robin | |
531 | * incrementing of their max_seq counters ensures the eventual fairness to all | |
532 | * eligible memcgs. For memcg reclaim, it still relies on mem_cgroup_iter(). | |
533 | */ | |
534 | #define MEMCG_NR_GENS 2 | |
535 | #define MEMCG_NR_BINS 8 | |
536 | ||
537 | struct lru_gen_memcg { | |
538 | /* the per-node memcg generation counter */ | |
539 | unsigned long seq; | |
540 | /* each memcg has one lru_gen_folio per node */ | |
541 | unsigned long nr_memcgs[MEMCG_NR_GENS]; | |
542 | /* per-node lru_gen_folio list for global reclaim */ | |
543 | struct hlist_nulls_head fifo[MEMCG_NR_GENS][MEMCG_NR_BINS]; | |
544 | /* protects the above */ | |
545 | spinlock_t lock; | |
546 | }; | |
547 | ||
548 | void lru_gen_init_pgdat(struct pglist_data *pgdat); | |
549 | ||
ec1c86b2 YZ |
550 | void lru_gen_init_memcg(struct mem_cgroup *memcg); |
551 | void lru_gen_exit_memcg(struct mem_cgroup *memcg); | |
e4dde56c YZ |
552 | void lru_gen_online_memcg(struct mem_cgroup *memcg); |
553 | void lru_gen_offline_memcg(struct mem_cgroup *memcg); | |
554 | void lru_gen_release_memcg(struct mem_cgroup *memcg); | |
5c7e7a0d | 555 | void lru_gen_soft_reclaim(struct mem_cgroup *memcg, int nid); |
e4dde56c YZ |
556 | |
557 | #else /* !CONFIG_MEMCG */ | |
558 | ||
559 | #define MEMCG_NR_GENS 1 | |
560 | ||
561 | struct lru_gen_memcg { | |
562 | }; | |
563 | ||
564 | static inline void lru_gen_init_pgdat(struct pglist_data *pgdat) | |
565 | { | |
566 | } | |
567 | ||
568 | #endif /* CONFIG_MEMCG */ | |
ec1c86b2 YZ |
569 | |
570 | #else /* !CONFIG_LRU_GEN */ | |
571 | ||
e4dde56c YZ |
572 | static inline void lru_gen_init_pgdat(struct pglist_data *pgdat) |
573 | { | |
574 | } | |
575 | ||
ec1c86b2 YZ |
576 | static inline void lru_gen_init_lruvec(struct lruvec *lruvec) |
577 | { | |
578 | } | |
579 | ||
018ee47f YZ |
580 | static inline void lru_gen_look_around(struct page_vma_mapped_walk *pvmw) |
581 | { | |
582 | } | |
583 | ||
ec1c86b2 | 584 | #ifdef CONFIG_MEMCG |
e4dde56c | 585 | |
ec1c86b2 YZ |
586 | static inline void lru_gen_init_memcg(struct mem_cgroup *memcg) |
587 | { | |
588 | } | |
589 | ||
590 | static inline void lru_gen_exit_memcg(struct mem_cgroup *memcg) | |
591 | { | |
592 | } | |
e4dde56c YZ |
593 | |
594 | static inline void lru_gen_online_memcg(struct mem_cgroup *memcg) | |
595 | { | |
596 | } | |
597 | ||
598 | static inline void lru_gen_offline_memcg(struct mem_cgroup *memcg) | |
599 | { | |
600 | } | |
601 | ||
602 | static inline void lru_gen_release_memcg(struct mem_cgroup *memcg) | |
603 | { | |
604 | } | |
605 | ||
5c7e7a0d | 606 | static inline void lru_gen_soft_reclaim(struct mem_cgroup *memcg, int nid) |
e4dde56c YZ |
607 | { |
608 | } | |
609 | ||
610 | #endif /* CONFIG_MEMCG */ | |
ec1c86b2 YZ |
611 | |
612 | #endif /* CONFIG_LRU_GEN */ | |
613 | ||
6290df54 | 614 | struct lruvec { |
23047a96 | 615 | struct list_head lists[NR_LRU_LISTS]; |
6168d0da AS |
616 | /* per lruvec lru_lock for memcg */ |
617 | spinlock_t lru_lock; | |
1431d4d1 JW |
618 | /* |
619 | * These track the cost of reclaiming one LRU - file or anon - | |
620 | * over the other. As the observed cost of reclaiming one LRU | |
621 | * increases, the reclaim scan balance tips toward the other. | |
622 | */ | |
623 | unsigned long anon_cost; | |
624 | unsigned long file_cost; | |
31d8fcac JW |
625 | /* Non-resident age, driven by LRU movement */ |
626 | atomic_long_t nonresident_age; | |
ed017373 YZ |
627 | /* Refaults at the time of last reclaim cycle */ |
628 | unsigned long refaults[ANON_AND_FILE]; | |
1b05117d JW |
629 | /* Various lruvec state flags (enum lruvec_flags) */ |
630 | unsigned long flags; | |
ec1c86b2 YZ |
631 | #ifdef CONFIG_LRU_GEN |
632 | /* evictable pages divided into generations */ | |
391655fe | 633 | struct lru_gen_folio lrugen; |
bd74fdae YZ |
634 | /* to concurrently iterate lru_gen_mm_list */ |
635 | struct lru_gen_mm_state mm_state; | |
ec1c86b2 | 636 | #endif |
c255a458 | 637 | #ifdef CONFIG_MEMCG |
599d0c95 | 638 | struct pglist_data *pgdat; |
7f5e86c2 | 639 | #endif |
6290df54 JW |
640 | }; |
641 | ||
c8244935 | 642 | /* Isolate for asynchronous migration */ |
f3fd4a61 | 643 | #define ISOLATE_ASYNC_MIGRATE ((__force isolate_mode_t)0x4) |
e46a2879 MK |
644 | /* Isolate unevictable pages */ |
645 | #define ISOLATE_UNEVICTABLE ((__force isolate_mode_t)0x8) | |
4356f21d MK |
646 | |
647 | /* LRU Isolation modes. */ | |
9efeccac | 648 | typedef unsigned __bitwise isolate_mode_t; |
4356f21d | 649 | |
41858966 MG |
650 | enum zone_watermarks { |
651 | WMARK_MIN, | |
652 | WMARK_LOW, | |
653 | WMARK_HIGH, | |
c574bbe9 | 654 | WMARK_PROMO, |
41858966 MG |
655 | NR_WMARK |
656 | }; | |
657 | ||
44042b44 | 658 | /* |
5d0a661d MG |
659 | * One per migratetype for each PAGE_ALLOC_COSTLY_ORDER. One additional list |
660 | * for THP which will usually be GFP_MOVABLE. Even if it is another type, | |
661 | * it should not contribute to serious fragmentation causing THP allocation | |
662 | * failures. | |
44042b44 MG |
663 | */ |
664 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
665 | #define NR_PCP_THP 1 | |
666 | #else | |
667 | #define NR_PCP_THP 0 | |
668 | #endif | |
5d0a661d MG |
669 | #define NR_LOWORDER_PCP_LISTS (MIGRATE_PCPTYPES * (PAGE_ALLOC_COSTLY_ORDER + 1)) |
670 | #define NR_PCP_LISTS (NR_LOWORDER_PCP_LISTS + NR_PCP_THP) | |
44042b44 | 671 | |
1c30844d MG |
672 | #define min_wmark_pages(z) (z->_watermark[WMARK_MIN] + z->watermark_boost) |
673 | #define low_wmark_pages(z) (z->_watermark[WMARK_LOW] + z->watermark_boost) | |
674 | #define high_wmark_pages(z) (z->_watermark[WMARK_HIGH] + z->watermark_boost) | |
675 | #define wmark_pages(z, i) (z->_watermark[i] + z->watermark_boost) | |
41858966 | 676 | |
ca71fe1a HY |
677 | /* |
678 | * Flags used in pcp->flags field. | |
679 | * | |
680 | * PCPF_PREV_FREE_HIGH_ORDER: a high-order page is freed in the | |
681 | * previous page freeing. To avoid to drain PCP for an accident | |
682 | * high-order page freeing. | |
362d37a1 HY |
683 | * |
684 | * PCPF_FREE_HIGH_BATCH: preserve "pcp->batch" pages in PCP before | |
685 | * draining PCP for consecutive high-order pages freeing without | |
686 | * allocation if data cache slice of CPU is large enough. To reduce | |
687 | * zone lock contention and keep cache-hot pages reusing. | |
ca71fe1a HY |
688 | */ |
689 | #define PCPF_PREV_FREE_HIGH_ORDER BIT(0) | |
362d37a1 | 690 | #define PCPF_FREE_HIGH_BATCH BIT(1) |
ca71fe1a | 691 | |
1da177e4 | 692 | struct per_cpu_pages { |
4b23a68f | 693 | spinlock_t lock; /* Protects lists field */ |
1da177e4 | 694 | int count; /* number of pages in the list */ |
1da177e4 | 695 | int high; /* high watermark, emptying needed */ |
90b41691 HY |
696 | int high_min; /* min high watermark */ |
697 | int high_max; /* max high watermark */ | |
1da177e4 | 698 | int batch; /* chunk size for buddy add/remove */ |
ca71fe1a | 699 | u8 flags; /* protected by pcp->lock */ |
c0a24239 | 700 | u8 alloc_factor; /* batch scaling factor during allocate */ |
ca71fe1a | 701 | u8 free_factor; /* batch scaling factor during free */ |
28f836b6 | 702 | #ifdef CONFIG_NUMA |
c0a24239 | 703 | u8 expire; /* When 0, remote pagesets are drained */ |
28f836b6 | 704 | #endif |
5f8dcc21 MG |
705 | |
706 | /* Lists of pages, one per migrate type stored on the pcp-lists */ | |
44042b44 | 707 | struct list_head lists[NR_PCP_LISTS]; |
5d0a661d | 708 | } ____cacheline_aligned_in_smp; |
1da177e4 | 709 | |
28f836b6 | 710 | struct per_cpu_zonestat { |
2244b95a CL |
711 | #ifdef CONFIG_SMP |
712 | s8 vm_stat_diff[NR_VM_ZONE_STAT_ITEMS]; | |
28f836b6 MG |
713 | s8 stat_threshold; |
714 | #endif | |
715 | #ifdef CONFIG_NUMA | |
f19298b9 MG |
716 | /* |
717 | * Low priority inaccurate counters that are only folded | |
718 | * on demand. Use a large type to avoid the overhead of | |
719 | * folding during refresh_cpu_vm_stats. | |
720 | */ | |
721 | unsigned long vm_numa_event[NR_VM_NUMA_EVENT_ITEMS]; | |
2244b95a | 722 | #endif |
99dcc3e5 | 723 | }; |
e7c8d5c9 | 724 | |
75ef7184 MG |
725 | struct per_cpu_nodestat { |
726 | s8 stat_threshold; | |
727 | s8 vm_node_stat_diff[NR_VM_NODE_STAT_ITEMS]; | |
728 | }; | |
729 | ||
97965478 CL |
730 | #endif /* !__GENERATING_BOUNDS.H */ |
731 | ||
2f1b6248 CL |
732 | enum zone_type { |
733 | /* | |
734f9246 NSJ |
734 | * ZONE_DMA and ZONE_DMA32 are used when there are peripherals not able |
735 | * to DMA to all of the addressable memory (ZONE_NORMAL). | |
736 | * On architectures where this area covers the whole 32 bit address | |
737 | * space ZONE_DMA32 is used. ZONE_DMA is left for the ones with smaller | |
738 | * DMA addressing constraints. This distinction is important as a 32bit | |
739 | * DMA mask is assumed when ZONE_DMA32 is defined. Some 64-bit | |
740 | * platforms may need both zones as they support peripherals with | |
741 | * different DMA addressing limitations. | |
2f1b6248 | 742 | */ |
734f9246 | 743 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 744 | ZONE_DMA, |
4b51d669 | 745 | #endif |
fb0e7942 | 746 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 747 | ZONE_DMA32, |
fb0e7942 | 748 | #endif |
2f1b6248 CL |
749 | /* |
750 | * Normal addressable memory is in ZONE_NORMAL. DMA operations can be | |
751 | * performed on pages in ZONE_NORMAL if the DMA devices support | |
752 | * transfers to all addressable memory. | |
753 | */ | |
754 | ZONE_NORMAL, | |
e53ef38d | 755 | #ifdef CONFIG_HIGHMEM |
2f1b6248 CL |
756 | /* |
757 | * A memory area that is only addressable by the kernel through | |
758 | * mapping portions into its own address space. This is for example | |
759 | * used by i386 to allow the kernel to address the memory beyond | |
760 | * 900MB. The kernel will set up special mappings (page | |
761 | * table entries on i386) for each page that the kernel needs to | |
762 | * access. | |
763 | */ | |
764 | ZONE_HIGHMEM, | |
e53ef38d | 765 | #endif |
9181a980 DH |
766 | /* |
767 | * ZONE_MOVABLE is similar to ZONE_NORMAL, except that it contains | |
768 | * movable pages with few exceptional cases described below. Main use | |
769 | * cases for ZONE_MOVABLE are to make memory offlining/unplug more | |
770 | * likely to succeed, and to locally limit unmovable allocations - e.g., | |
771 | * to increase the number of THP/huge pages. Notable special cases are: | |
772 | * | |
773 | * 1. Pinned pages: (long-term) pinning of movable pages might | |
d1e153fe PT |
774 | * essentially turn such pages unmovable. Therefore, we do not allow |
775 | * pinning long-term pages in ZONE_MOVABLE. When pages are pinned and | |
776 | * faulted, they come from the right zone right away. However, it is | |
777 | * still possible that address space already has pages in | |
778 | * ZONE_MOVABLE at the time when pages are pinned (i.e. user has | |
779 | * touches that memory before pinning). In such case we migrate them | |
780 | * to a different zone. When migration fails - pinning fails. | |
9181a980 DH |
781 | * 2. memblock allocations: kernelcore/movablecore setups might create |
782 | * situations where ZONE_MOVABLE contains unmovable allocations | |
783 | * after boot. Memory offlining and allocations fail early. | |
784 | * 3. Memory holes: kernelcore/movablecore setups might create very rare | |
785 | * situations where ZONE_MOVABLE contains memory holes after boot, | |
786 | * for example, if we have sections that are only partially | |
787 | * populated. Memory offlining and allocations fail early. | |
788 | * 4. PG_hwpoison pages: while poisoned pages can be skipped during | |
789 | * memory offlining, such pages cannot be allocated. | |
790 | * 5. Unmovable PG_offline pages: in paravirtualized environments, | |
791 | * hotplugged memory blocks might only partially be managed by the | |
792 | * buddy (e.g., via XEN-balloon, Hyper-V balloon, virtio-mem). The | |
793 | * parts not manged by the buddy are unmovable PG_offline pages. In | |
794 | * some cases (virtio-mem), such pages can be skipped during | |
795 | * memory offlining, however, cannot be moved/allocated. These | |
796 | * techniques might use alloc_contig_range() to hide previously | |
797 | * exposed pages from the buddy again (e.g., to implement some sort | |
798 | * of memory unplug in virtio-mem). | |
9afaf30f PT |
799 | * 6. ZERO_PAGE(0), kernelcore/movablecore setups might create |
800 | * situations where ZERO_PAGE(0) which is allocated differently | |
801 | * on different platforms may end up in a movable zone. ZERO_PAGE(0) | |
802 | * cannot be migrated. | |
a08a2ae3 OS |
803 | * 7. Memory-hotplug: when using memmap_on_memory and onlining the |
804 | * memory to the MOVABLE zone, the vmemmap pages are also placed in | |
805 | * such zone. Such pages cannot be really moved around as they are | |
806 | * self-stored in the range, but they are treated as movable when | |
807 | * the range they describe is about to be offlined. | |
9181a980 DH |
808 | * |
809 | * In general, no unmovable allocations that degrade memory offlining | |
810 | * should end up in ZONE_MOVABLE. Allocators (like alloc_contig_range()) | |
811 | * have to expect that migrating pages in ZONE_MOVABLE can fail (even | |
812 | * if has_unmovable_pages() states that there are no unmovable pages, | |
813 | * there can be false negatives). | |
814 | */ | |
2a1e274a | 815 | ZONE_MOVABLE, |
033fbae9 DW |
816 | #ifdef CONFIG_ZONE_DEVICE |
817 | ZONE_DEVICE, | |
818 | #endif | |
97965478 | 819 | __MAX_NR_ZONES |
033fbae9 | 820 | |
2f1b6248 | 821 | }; |
1da177e4 | 822 | |
97965478 CL |
823 | #ifndef __GENERATING_BOUNDS_H |
824 | ||
ed017373 YZ |
825 | #define ASYNC_AND_SYNC 2 |
826 | ||
1da177e4 | 827 | struct zone { |
3484b2de | 828 | /* Read-mostly fields */ |
41858966 MG |
829 | |
830 | /* zone watermarks, access with *_wmark_pages(zone) macros */ | |
a9214443 | 831 | unsigned long _watermark[NR_WMARK]; |
1c30844d | 832 | unsigned long watermark_boost; |
41858966 | 833 | |
0aaa29a5 MG |
834 | unsigned long nr_reserved_highatomic; |
835 | ||
1da177e4 | 836 | /* |
89903327 AM |
837 | * We don't know if the memory that we're going to allocate will be |
838 | * freeable or/and it will be released eventually, so to avoid totally | |
839 | * wasting several GB of ram we must reserve some of the lower zone | |
840 | * memory (otherwise we risk to run OOM on the lower zones despite | |
841 | * there being tons of freeable ram on the higher zones). This array is | |
842 | * recalculated at runtime if the sysctl_lowmem_reserve_ratio sysctl | |
843 | * changes. | |
1da177e4 | 844 | */ |
3484b2de | 845 | long lowmem_reserve[MAX_NR_ZONES]; |
ab8fabd4 | 846 | |
e7c8d5c9 | 847 | #ifdef CONFIG_NUMA |
d5f541ed | 848 | int node; |
3484b2de | 849 | #endif |
3484b2de | 850 | struct pglist_data *zone_pgdat; |
28f836b6 MG |
851 | struct per_cpu_pages __percpu *per_cpu_pageset; |
852 | struct per_cpu_zonestat __percpu *per_cpu_zonestats; | |
952eaf81 VB |
853 | /* |
854 | * the high and batch values are copied to individual pagesets for | |
855 | * faster access | |
856 | */ | |
90b41691 HY |
857 | int pageset_high_min; |
858 | int pageset_high_max; | |
952eaf81 | 859 | int pageset_batch; |
3484b2de | 860 | |
835c134e MG |
861 | #ifndef CONFIG_SPARSEMEM |
862 | /* | |
d9c23400 | 863 | * Flags for a pageblock_nr_pages block. See pageblock-flags.h. |
835c134e MG |
864 | * In SPARSEMEM, this map is stored in struct mem_section |
865 | */ | |
866 | unsigned long *pageblock_flags; | |
867 | #endif /* CONFIG_SPARSEMEM */ | |
868 | ||
1da177e4 LT |
869 | /* zone_start_pfn == zone_start_paddr >> PAGE_SHIFT */ |
870 | unsigned long zone_start_pfn; | |
871 | ||
bdc8cb98 | 872 | /* |
9feedc9d JL |
873 | * spanned_pages is the total pages spanned by the zone, including |
874 | * holes, which is calculated as: | |
875 | * spanned_pages = zone_end_pfn - zone_start_pfn; | |
bdc8cb98 | 876 | * |
9feedc9d JL |
877 | * present_pages is physical pages existing within the zone, which |
878 | * is calculated as: | |
8761e31c | 879 | * present_pages = spanned_pages - absent_pages(pages in holes); |
9feedc9d | 880 | * |
4b097002 DH |
881 | * present_early_pages is present pages existing within the zone |
882 | * located on memory available since early boot, excluding hotplugged | |
883 | * memory. | |
884 | * | |
9feedc9d JL |
885 | * managed_pages is present pages managed by the buddy system, which |
886 | * is calculated as (reserved_pages includes pages allocated by the | |
887 | * bootmem allocator): | |
888 | * managed_pages = present_pages - reserved_pages; | |
889 | * | |
3c381db1 DH |
890 | * cma pages is present pages that are assigned for CMA use |
891 | * (MIGRATE_CMA). | |
892 | * | |
9feedc9d JL |
893 | * So present_pages may be used by memory hotplug or memory power |
894 | * management logic to figure out unmanaged pages by checking | |
895 | * (present_pages - managed_pages). And managed_pages should be used | |
896 | * by page allocator and vm scanner to calculate all kinds of watermarks | |
897 | * and thresholds. | |
898 | * | |
899 | * Locking rules: | |
900 | * | |
901 | * zone_start_pfn and spanned_pages are protected by span_seqlock. | |
902 | * It is a seqlock because it has to be read outside of zone->lock, | |
903 | * and it is done in the main allocator path. But, it is written | |
904 | * quite infrequently. | |
905 | * | |
906 | * The span_seq lock is declared along with zone->lock because it is | |
bdc8cb98 DH |
907 | * frequently read in proximity to zone->lock. It's good to |
908 | * give them a chance of being in the same cacheline. | |
9feedc9d | 909 | * |
c3d5f5f0 | 910 | * Write access to present_pages at runtime should be protected by |
e8da368a YZL |
911 | * mem_hotplug_begin/done(). Any reader who can't tolerant drift of |
912 | * present_pages should use get_online_mems() to get a stable value. | |
bdc8cb98 | 913 | */ |
9705bea5 | 914 | atomic_long_t managed_pages; |
9feedc9d JL |
915 | unsigned long spanned_pages; |
916 | unsigned long present_pages; | |
4b097002 DH |
917 | #if defined(CONFIG_MEMORY_HOTPLUG) |
918 | unsigned long present_early_pages; | |
919 | #endif | |
3c381db1 DH |
920 | #ifdef CONFIG_CMA |
921 | unsigned long cma_pages; | |
922 | #endif | |
3484b2de MG |
923 | |
924 | const char *name; | |
1da177e4 | 925 | |
ad53f92e JK |
926 | #ifdef CONFIG_MEMORY_ISOLATION |
927 | /* | |
928 | * Number of isolated pageblock. It is used to solve incorrect | |
929 | * freepage counting problem due to racy retrieving migratetype | |
930 | * of pageblock. Protected by zone->lock. | |
931 | */ | |
932 | unsigned long nr_isolate_pageblock; | |
933 | #endif | |
934 | ||
3484b2de MG |
935 | #ifdef CONFIG_MEMORY_HOTPLUG |
936 | /* see spanned/present_pages for more description */ | |
937 | seqlock_t span_seqlock; | |
938 | #endif | |
939 | ||
9dcb8b68 | 940 | int initialized; |
3484b2de | 941 | |
0f661148 | 942 | /* Write-intensive fields used from the page allocator */ |
e6ad640b | 943 | CACHELINE_PADDING(_pad1_); |
0f661148 | 944 | |
3484b2de | 945 | /* free areas of different sizes */ |
23baf831 | 946 | struct free_area free_area[MAX_ORDER + 1]; |
3484b2de | 947 | |
dcdfdd40 KS |
948 | #ifdef CONFIG_UNACCEPTED_MEMORY |
949 | /* Pages to be accepted. All pages on the list are MAX_ORDER */ | |
950 | struct list_head unaccepted_pages; | |
951 | #endif | |
952 | ||
3484b2de MG |
953 | /* zone flags, see below */ |
954 | unsigned long flags; | |
955 | ||
0f661148 | 956 | /* Primarily protects free_area */ |
a368ab67 MG |
957 | spinlock_t lock; |
958 | ||
0f661148 | 959 | /* Write-intensive fields used by compaction and vmstats. */ |
e6ad640b | 960 | CACHELINE_PADDING(_pad2_); |
3484b2de | 961 | |
3484b2de MG |
962 | /* |
963 | * When free pages are below this point, additional steps are taken | |
964 | * when reading the number of free pages to avoid per-cpu counter | |
965 | * drift allowing watermarks to be breached | |
966 | */ | |
967 | unsigned long percpu_drift_mark; | |
968 | ||
969 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA | |
970 | /* pfn where compaction free scanner should start */ | |
971 | unsigned long compact_cached_free_pfn; | |
ed017373 YZ |
972 | /* pfn where compaction migration scanner should start */ |
973 | unsigned long compact_cached_migrate_pfn[ASYNC_AND_SYNC]; | |
e332f741 MG |
974 | unsigned long compact_init_migrate_pfn; |
975 | unsigned long compact_init_free_pfn; | |
3484b2de MG |
976 | #endif |
977 | ||
978 | #ifdef CONFIG_COMPACTION | |
979 | /* | |
980 | * On compaction failure, 1<<compact_defer_shift compactions | |
981 | * are skipped before trying again. The number attempted since | |
982 | * last failure is tracked with compact_considered. | |
860b3272 | 983 | * compact_order_failed is the minimum compaction failed order. |
3484b2de MG |
984 | */ |
985 | unsigned int compact_considered; | |
986 | unsigned int compact_defer_shift; | |
987 | int compact_order_failed; | |
988 | #endif | |
989 | ||
990 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA | |
991 | /* Set to true when the PG_migrate_skip bits should be cleared */ | |
992 | bool compact_blockskip_flush; | |
993 | #endif | |
994 | ||
7cf91a98 JK |
995 | bool contiguous; |
996 | ||
e6ad640b | 997 | CACHELINE_PADDING(_pad3_); |
3484b2de MG |
998 | /* Zone statistics */ |
999 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
f19298b9 | 1000 | atomic_long_t vm_numa_event[NR_VM_NUMA_EVENT_ITEMS]; |
22fc6ecc | 1001 | } ____cacheline_internodealigned_in_smp; |
1da177e4 | 1002 | |
599d0c95 | 1003 | enum pgdat_flags { |
599d0c95 | 1004 | PGDAT_DIRTY, /* reclaim scanning has recently found |
d43006d5 MG |
1005 | * many dirty file pages at the tail |
1006 | * of the LRU. | |
1007 | */ | |
599d0c95 | 1008 | PGDAT_WRITEBACK, /* reclaim scanning has recently found |
283aba9f MG |
1009 | * many pages under writeback |
1010 | */ | |
a5f5f91d | 1011 | PGDAT_RECLAIM_LOCKED, /* prevents concurrent reclaim */ |
57054651 | 1012 | }; |
e815af95 | 1013 | |
73444bc4 MG |
1014 | enum zone_flags { |
1015 | ZONE_BOOSTED_WATERMARK, /* zone recently boosted watermarks. | |
1016 | * Cleared when kswapd is woken. | |
1017 | */ | |
c49c2c47 | 1018 | ZONE_RECLAIM_ACTIVE, /* kswapd may be scanning the zone. */ |
57c0419c | 1019 | ZONE_BELOW_HIGH, /* zone is below high watermark. */ |
73444bc4 MG |
1020 | }; |
1021 | ||
9705bea5 AK |
1022 | static inline unsigned long zone_managed_pages(struct zone *zone) |
1023 | { | |
1024 | return (unsigned long)atomic_long_read(&zone->managed_pages); | |
1025 | } | |
1026 | ||
3c381db1 DH |
1027 | static inline unsigned long zone_cma_pages(struct zone *zone) |
1028 | { | |
1029 | #ifdef CONFIG_CMA | |
1030 | return zone->cma_pages; | |
1031 | #else | |
1032 | return 0; | |
1033 | #endif | |
1034 | } | |
1035 | ||
f9228b20 | 1036 | static inline unsigned long zone_end_pfn(const struct zone *zone) |
108bcc96 CS |
1037 | { |
1038 | return zone->zone_start_pfn + zone->spanned_pages; | |
1039 | } | |
1040 | ||
1041 | static inline bool zone_spans_pfn(const struct zone *zone, unsigned long pfn) | |
1042 | { | |
1043 | return zone->zone_start_pfn <= pfn && pfn < zone_end_pfn(zone); | |
1044 | } | |
1045 | ||
2a6e3ebe CS |
1046 | static inline bool zone_is_initialized(struct zone *zone) |
1047 | { | |
9dcb8b68 | 1048 | return zone->initialized; |
2a6e3ebe CS |
1049 | } |
1050 | ||
1051 | static inline bool zone_is_empty(struct zone *zone) | |
1052 | { | |
1053 | return zone->spanned_pages == 0; | |
1054 | } | |
1055 | ||
5bb88dc5 AS |
1056 | #ifndef BUILD_VDSO32_64 |
1057 | /* | |
1058 | * The zone field is never updated after free_area_init_core() | |
1059 | * sets it, so none of the operations on it need to be atomic. | |
1060 | */ | |
1061 | ||
1062 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ | |
1063 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) | |
1064 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) | |
1065 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
1066 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) | |
1067 | #define KASAN_TAG_PGOFF (LAST_CPUPID_PGOFF - KASAN_TAG_WIDTH) | |
ec1c86b2 YZ |
1068 | #define LRU_GEN_PGOFF (KASAN_TAG_PGOFF - LRU_GEN_WIDTH) |
1069 | #define LRU_REFS_PGOFF (LRU_GEN_PGOFF - LRU_REFS_WIDTH) | |
5bb88dc5 AS |
1070 | |
1071 | /* | |
1072 | * Define the bit shifts to access each section. For non-existent | |
1073 | * sections we define the shift as 0; that plus a 0 mask ensures | |
1074 | * the compiler will optimise away reference to them. | |
1075 | */ | |
1076 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) | |
1077 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
1078 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
1079 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) | |
1080 | #define KASAN_TAG_PGSHIFT (KASAN_TAG_PGOFF * (KASAN_TAG_WIDTH != 0)) | |
1081 | ||
1082 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ | |
1083 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
1084 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) | |
1085 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF) ? \ | |
1086 | SECTIONS_PGOFF : ZONES_PGOFF) | |
1087 | #else | |
1088 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) | |
1089 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF) ? \ | |
1090 | NODES_PGOFF : ZONES_PGOFF) | |
1091 | #endif | |
1092 | ||
1093 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) | |
1094 | ||
1095 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) | |
1096 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
1097 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
1098 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) | |
1099 | #define KASAN_TAG_MASK ((1UL << KASAN_TAG_WIDTH) - 1) | |
1100 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) | |
1101 | ||
1102 | static inline enum zone_type page_zonenum(const struct page *page) | |
1103 | { | |
1104 | ASSERT_EXCLUSIVE_BITS(page->flags, ZONES_MASK << ZONES_PGSHIFT); | |
1105 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; | |
1106 | } | |
1107 | ||
1108 | static inline enum zone_type folio_zonenum(const struct folio *folio) | |
1109 | { | |
1110 | return page_zonenum(&folio->page); | |
1111 | } | |
1112 | ||
1113 | #ifdef CONFIG_ZONE_DEVICE | |
1114 | static inline bool is_zone_device_page(const struct page *page) | |
1115 | { | |
1116 | return page_zonenum(page) == ZONE_DEVICE; | |
1117 | } | |
49580e69 LG |
1118 | |
1119 | /* | |
1120 | * Consecutive zone device pages should not be merged into the same sgl | |
1121 | * or bvec segment with other types of pages or if they belong to different | |
1122 | * pgmaps. Otherwise getting the pgmap of a given segment is not possible | |
1123 | * without scanning the entire segment. This helper returns true either if | |
1124 | * both pages are not zone device pages or both pages are zone device pages | |
1125 | * with the same pgmap. | |
1126 | */ | |
1127 | static inline bool zone_device_pages_have_same_pgmap(const struct page *a, | |
1128 | const struct page *b) | |
1129 | { | |
1130 | if (is_zone_device_page(a) != is_zone_device_page(b)) | |
1131 | return false; | |
1132 | if (!is_zone_device_page(a)) | |
1133 | return true; | |
1134 | return a->pgmap == b->pgmap; | |
1135 | } | |
1136 | ||
5bb88dc5 AS |
1137 | extern void memmap_init_zone_device(struct zone *, unsigned long, |
1138 | unsigned long, struct dev_pagemap *); | |
1139 | #else | |
1140 | static inline bool is_zone_device_page(const struct page *page) | |
1141 | { | |
1142 | return false; | |
1143 | } | |
49580e69 LG |
1144 | static inline bool zone_device_pages_have_same_pgmap(const struct page *a, |
1145 | const struct page *b) | |
1146 | { | |
1147 | return true; | |
1148 | } | |
5bb88dc5 AS |
1149 | #endif |
1150 | ||
1151 | static inline bool folio_is_zone_device(const struct folio *folio) | |
1152 | { | |
1153 | return is_zone_device_page(&folio->page); | |
1154 | } | |
1155 | ||
1156 | static inline bool is_zone_movable_page(const struct page *page) | |
1157 | { | |
1158 | return page_zonenum(page) == ZONE_MOVABLE; | |
1159 | } | |
708ff491 VMO |
1160 | |
1161 | static inline bool folio_is_zone_movable(const struct folio *folio) | |
1162 | { | |
1163 | return folio_zonenum(folio) == ZONE_MOVABLE; | |
1164 | } | |
5bb88dc5 AS |
1165 | #endif |
1166 | ||
f1dd2cd1 MH |
1167 | /* |
1168 | * Return true if [start_pfn, start_pfn + nr_pages) range has a non-empty | |
1169 | * intersection with the given zone | |
1170 | */ | |
1171 | static inline bool zone_intersects(struct zone *zone, | |
1172 | unsigned long start_pfn, unsigned long nr_pages) | |
1173 | { | |
1174 | if (zone_is_empty(zone)) | |
1175 | return false; | |
1176 | if (start_pfn >= zone_end_pfn(zone) || | |
1177 | start_pfn + nr_pages <= zone->zone_start_pfn) | |
1178 | return false; | |
1179 | ||
1180 | return true; | |
1181 | } | |
1182 | ||
1da177e4 LT |
1183 | /* |
1184 | * The "priority" of VM scanning is how much of the queues we will scan in one | |
1185 | * go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the | |
1186 | * queues ("queue_length >> 12") during an aging round. | |
1187 | */ | |
1188 | #define DEF_PRIORITY 12 | |
1189 | ||
9276b1bc PJ |
1190 | /* Maximum number of zones on a zonelist */ |
1191 | #define MAX_ZONES_PER_ZONELIST (MAX_NUMNODES * MAX_NR_ZONES) | |
1192 | ||
c00eb15a YB |
1193 | enum { |
1194 | ZONELIST_FALLBACK, /* zonelist with fallback */ | |
9276b1bc | 1195 | #ifdef CONFIG_NUMA |
c00eb15a YB |
1196 | /* |
1197 | * The NUMA zonelists are doubled because we need zonelists that | |
1198 | * restrict the allocations to a single node for __GFP_THISNODE. | |
1199 | */ | |
1200 | ZONELIST_NOFALLBACK, /* zonelist without fallback (__GFP_THISNODE) */ | |
9276b1bc | 1201 | #endif |
c00eb15a YB |
1202 | MAX_ZONELISTS |
1203 | }; | |
9276b1bc | 1204 | |
dd1a239f MG |
1205 | /* |
1206 | * This struct contains information about a zone in a zonelist. It is stored | |
1207 | * here to avoid dereferences into large structures and lookups of tables | |
1208 | */ | |
1209 | struct zoneref { | |
1210 | struct zone *zone; /* Pointer to actual zone */ | |
1211 | int zone_idx; /* zone_idx(zoneref->zone) */ | |
1212 | }; | |
1213 | ||
1da177e4 LT |
1214 | /* |
1215 | * One allocation request operates on a zonelist. A zonelist | |
1216 | * is a list of zones, the first one is the 'goal' of the | |
1217 | * allocation, the other zones are fallback zones, in decreasing | |
1218 | * priority. | |
1219 | * | |
dd1a239f MG |
1220 | * To speed the reading of the zonelist, the zonerefs contain the zone index |
1221 | * of the entry being read. Helper functions to access information given | |
1222 | * a struct zoneref are | |
1223 | * | |
1224 | * zonelist_zone() - Return the struct zone * for an entry in _zonerefs | |
1225 | * zonelist_zone_idx() - Return the index of the zone for an entry | |
1226 | * zonelist_node_idx() - Return the index of the node for an entry | |
1da177e4 LT |
1227 | */ |
1228 | struct zonelist { | |
dd1a239f | 1229 | struct zoneref _zonerefs[MAX_ZONES_PER_ZONELIST + 1]; |
1da177e4 LT |
1230 | }; |
1231 | ||
bb1c50d3 MR |
1232 | /* |
1233 | * The array of struct pages for flatmem. | |
1234 | * It must be declared for SPARSEMEM as well because there are configurations | |
1235 | * that rely on that. | |
1236 | */ | |
5b99cd0e | 1237 | extern struct page *mem_map; |
5b99cd0e | 1238 | |
364c1eeb YS |
1239 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1240 | struct deferred_split { | |
1241 | spinlock_t split_queue_lock; | |
1242 | struct list_head split_queue; | |
1243 | unsigned long split_queue_len; | |
1244 | }; | |
1245 | #endif | |
1246 | ||
44b8f8bf JY |
1247 | #ifdef CONFIG_MEMORY_FAILURE |
1248 | /* | |
1249 | * Per NUMA node memory failure handling statistics. | |
1250 | */ | |
1251 | struct memory_failure_stats { | |
1252 | /* | |
1253 | * Number of raw pages poisoned. | |
1254 | * Cases not accounted: memory outside kernel control, offline page, | |
1255 | * arch-specific memory_failure (SGX), hwpoison_filter() filtered | |
1256 | * error events, and unpoison actions from hwpoison_unpoison. | |
1257 | */ | |
1258 | unsigned long total; | |
1259 | /* | |
1260 | * Recovery results of poisoned raw pages handled by memory_failure, | |
1261 | * in sync with mf_result. | |
1262 | * total = ignored + failed + delayed + recovered. | |
1263 | * total * PAGE_SIZE * #nodes = /proc/meminfo/HardwareCorrupted. | |
1264 | */ | |
1265 | unsigned long ignored; | |
1266 | unsigned long failed; | |
1267 | unsigned long delayed; | |
1268 | unsigned long recovered; | |
1269 | }; | |
1270 | #endif | |
1271 | ||
1da177e4 | 1272 | /* |
1da177e4 | 1273 | * On NUMA machines, each NUMA node would have a pg_data_t to describe |
618b8c20 NB |
1274 | * it's memory layout. On UMA machines there is a single pglist_data which |
1275 | * describes the whole memory. | |
1da177e4 LT |
1276 | * |
1277 | * Memory statistics and page replacement data structures are maintained on a | |
1278 | * per-zone basis. | |
1279 | */ | |
1da177e4 | 1280 | typedef struct pglist_data { |
496df3d3 BW |
1281 | /* |
1282 | * node_zones contains just the zones for THIS node. Not all of the | |
1283 | * zones may be populated, but it is the full list. It is referenced by | |
1284 | * this node's node_zonelists as well as other node's node_zonelists. | |
1285 | */ | |
1da177e4 | 1286 | struct zone node_zones[MAX_NR_ZONES]; |
496df3d3 BW |
1287 | |
1288 | /* | |
1289 | * node_zonelists contains references to all zones in all nodes. | |
1290 | * Generally the first zones will be references to this node's | |
1291 | * node_zones. | |
1292 | */ | |
523b9458 | 1293 | struct zonelist node_zonelists[MAX_ZONELISTS]; |
496df3d3 BW |
1294 | |
1295 | int nr_zones; /* number of populated zones in this node */ | |
43b02ba9 | 1296 | #ifdef CONFIG_FLATMEM /* means !SPARSEMEM */ |
1da177e4 | 1297 | struct page *node_mem_map; |
eefa864b JK |
1298 | #ifdef CONFIG_PAGE_EXTENSION |
1299 | struct page_ext *node_page_ext; | |
1300 | #endif | |
d41dee36 | 1301 | #endif |
3a2d7fa8 | 1302 | #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) |
208d54e5 | 1303 | /* |
fa004ab7 WY |
1304 | * Must be held any time you expect node_start_pfn, |
1305 | * node_present_pages, node_spanned_pages or nr_zones to stay constant. | |
3d060856 PT |
1306 | * Also synchronizes pgdat->first_deferred_pfn during deferred page |
1307 | * init. | |
208d54e5 | 1308 | * |
114d4b79 | 1309 | * pgdat_resize_lock() and pgdat_resize_unlock() are provided to |
3a2d7fa8 PT |
1310 | * manipulate node_size_lock without checking for CONFIG_MEMORY_HOTPLUG |
1311 | * or CONFIG_DEFERRED_STRUCT_PAGE_INIT. | |
114d4b79 | 1312 | * |
72c3b51b | 1313 | * Nests above zone->lock and zone->span_seqlock |
208d54e5 DH |
1314 | */ |
1315 | spinlock_t node_size_lock; | |
1316 | #endif | |
1da177e4 LT |
1317 | unsigned long node_start_pfn; |
1318 | unsigned long node_present_pages; /* total number of physical pages */ | |
1319 | unsigned long node_spanned_pages; /* total size of physical page | |
1320 | range, including holes */ | |
1321 | int node_id; | |
1da177e4 | 1322 | wait_queue_head_t kswapd_wait; |
5515061d | 1323 | wait_queue_head_t pfmemalloc_wait; |
8cd7c588 MG |
1324 | |
1325 | /* workqueues for throttling reclaim for different reasons. */ | |
1326 | wait_queue_head_t reclaim_wait[NR_VMSCAN_THROTTLE]; | |
1327 | ||
1328 | atomic_t nr_writeback_throttled;/* nr of writeback-throttled tasks */ | |
1329 | unsigned long nr_reclaim_start; /* nr pages written while throttled | |
1330 | * when throttling started. */ | |
b4a0215e KW |
1331 | #ifdef CONFIG_MEMORY_HOTPLUG |
1332 | struct mutex kswapd_lock; | |
1333 | #endif | |
1334 | struct task_struct *kswapd; /* Protected by kswapd_lock */ | |
38087d9b | 1335 | int kswapd_order; |
97a225e6 | 1336 | enum zone_type kswapd_highest_zoneidx; |
38087d9b | 1337 | |
c73322d0 JW |
1338 | int kswapd_failures; /* Number of 'reclaimed == 0' runs */ |
1339 | ||
698b1b30 VB |
1340 | #ifdef CONFIG_COMPACTION |
1341 | int kcompactd_max_order; | |
97a225e6 | 1342 | enum zone_type kcompactd_highest_zoneidx; |
698b1b30 VB |
1343 | wait_queue_head_t kcompactd_wait; |
1344 | struct task_struct *kcompactd; | |
65d759c8 | 1345 | bool proactive_compact_trigger; |
8177a420 | 1346 | #endif |
281e3726 MG |
1347 | /* |
1348 | * This is a per-node reserve of pages that are not available | |
1349 | * to userspace allocations. | |
1350 | */ | |
1351 | unsigned long totalreserve_pages; | |
1352 | ||
a5f5f91d MG |
1353 | #ifdef CONFIG_NUMA |
1354 | /* | |
0a3c5772 | 1355 | * node reclaim becomes active if more unmapped pages exist. |
a5f5f91d MG |
1356 | */ |
1357 | unsigned long min_unmapped_pages; | |
1358 | unsigned long min_slab_pages; | |
1359 | #endif /* CONFIG_NUMA */ | |
1360 | ||
a52633d8 | 1361 | /* Write-intensive fields used by page reclaim */ |
e6ad640b | 1362 | CACHELINE_PADDING(_pad1_); |
3a80a7fa MG |
1363 | |
1364 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT | |
1365 | /* | |
1366 | * If memory initialisation on large machines is deferred then this | |
1367 | * is the first PFN that needs to be initialised. | |
1368 | */ | |
1369 | unsigned long first_deferred_pfn; | |
1370 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ | |
a3d0a918 KS |
1371 | |
1372 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
364c1eeb | 1373 | struct deferred_split deferred_split_queue; |
a3d0a918 | 1374 | #endif |
75ef7184 | 1375 | |
c6833e10 HY |
1376 | #ifdef CONFIG_NUMA_BALANCING |
1377 | /* start time in ms of current promote rate limit period */ | |
1378 | unsigned int nbp_rl_start; | |
1379 | /* number of promote candidate pages at start time of current rate limit period */ | |
1380 | unsigned long nbp_rl_nr_cand; | |
c959924b HY |
1381 | /* promote threshold in ms */ |
1382 | unsigned int nbp_threshold; | |
1383 | /* start time in ms of current promote threshold adjustment period */ | |
1384 | unsigned int nbp_th_start; | |
1385 | /* | |
c7cdf94e | 1386 | * number of promote candidate pages at start time of current promote |
c959924b HY |
1387 | * threshold adjustment period |
1388 | */ | |
1389 | unsigned long nbp_th_nr_cand; | |
c6833e10 | 1390 | #endif |
599d0c95 | 1391 | /* Fields commonly accessed by the page reclaim scanner */ |
867e5e1d JW |
1392 | |
1393 | /* | |
1394 | * NOTE: THIS IS UNUSED IF MEMCG IS ENABLED. | |
1395 | * | |
1396 | * Use mem_cgroup_lruvec() to look up lruvecs. | |
1397 | */ | |
1398 | struct lruvec __lruvec; | |
599d0c95 | 1399 | |
599d0c95 MG |
1400 | unsigned long flags; |
1401 | ||
bd74fdae YZ |
1402 | #ifdef CONFIG_LRU_GEN |
1403 | /* kswap mm walk data */ | |
9a52b2f3 | 1404 | struct lru_gen_mm_walk mm_walk; |
e4dde56c YZ |
1405 | /* lru_gen_folio list */ |
1406 | struct lru_gen_memcg memcg_lru; | |
bd74fdae YZ |
1407 | #endif |
1408 | ||
e6ad640b | 1409 | CACHELINE_PADDING(_pad2_); |
599d0c95 | 1410 | |
75ef7184 MG |
1411 | /* Per-node vmstats */ |
1412 | struct per_cpu_nodestat __percpu *per_cpu_nodestats; | |
1413 | atomic_long_t vm_stat[NR_VM_NODE_STAT_ITEMS]; | |
7766cf7a AK |
1414 | #ifdef CONFIG_NUMA |
1415 | struct memory_tier __rcu *memtier; | |
1416 | #endif | |
44b8f8bf JY |
1417 | #ifdef CONFIG_MEMORY_FAILURE |
1418 | struct memory_failure_stats mf_stats; | |
1419 | #endif | |
1da177e4 LT |
1420 | } pg_data_t; |
1421 | ||
1422 | #define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages) | |
1423 | #define node_spanned_pages(nid) (NODE_DATA(nid)->node_spanned_pages) | |
1424 | ||
c6830c22 | 1425 | #define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn) |
da3649e1 | 1426 | #define node_end_pfn(nid) pgdat_end_pfn(NODE_DATA(nid)) |
c6830c22 | 1427 | |
da3649e1 CS |
1428 | static inline unsigned long pgdat_end_pfn(pg_data_t *pgdat) |
1429 | { | |
1430 | return pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
1431 | } | |
1432 | ||
208d54e5 DH |
1433 | #include <linux/memory_hotplug.h> |
1434 | ||
72675e13 | 1435 | void build_all_zonelists(pg_data_t *pgdat); |
5ecd9d40 | 1436 | void wakeup_kswapd(struct zone *zone, gfp_t gfp_mask, int order, |
97a225e6 | 1437 | enum zone_type highest_zoneidx); |
86a294a8 | 1438 | bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, |
97a225e6 | 1439 | int highest_zoneidx, unsigned int alloc_flags, |
86a294a8 | 1440 | long free_pages); |
7aeb09f9 | 1441 | bool zone_watermark_ok(struct zone *z, unsigned int order, |
97a225e6 | 1442 | unsigned long mark, int highest_zoneidx, |
c603844b | 1443 | unsigned int alloc_flags); |
7aeb09f9 | 1444 | bool zone_watermark_ok_safe(struct zone *z, unsigned int order, |
97a225e6 | 1445 | unsigned long mark, int highest_zoneidx); |
c1d0da83 LD |
1446 | /* |
1447 | * Memory initialization context, use to differentiate memory added by | |
1448 | * the platform statically or via memory hotplug interface. | |
1449 | */ | |
1450 | enum meminit_context { | |
1451 | MEMINIT_EARLY, | |
1452 | MEMINIT_HOTPLUG, | |
a2f3aa02 | 1453 | }; |
c1d0da83 | 1454 | |
dc0bbf3b | 1455 | extern void init_currently_empty_zone(struct zone *zone, unsigned long start_pfn, |
b171e409 | 1456 | unsigned long size); |
718127cc | 1457 | |
bea8c150 | 1458 | extern void lruvec_init(struct lruvec *lruvec); |
7f5e86c2 | 1459 | |
599d0c95 | 1460 | static inline struct pglist_data *lruvec_pgdat(struct lruvec *lruvec) |
7f5e86c2 | 1461 | { |
c255a458 | 1462 | #ifdef CONFIG_MEMCG |
599d0c95 | 1463 | return lruvec->pgdat; |
7f5e86c2 | 1464 | #else |
867e5e1d | 1465 | return container_of(lruvec, struct pglist_data, __lruvec); |
7f5e86c2 KK |
1466 | #endif |
1467 | } | |
1468 | ||
7aac7898 LS |
1469 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
1470 | int local_memory_node(int node_id); | |
1471 | #else | |
1472 | static inline int local_memory_node(int node_id) { return node_id; }; | |
1473 | #endif | |
1474 | ||
1da177e4 LT |
1475 | /* |
1476 | * zone_idx() returns 0 for the ZONE_DMA zone, 1 for the ZONE_NORMAL zone, etc. | |
1477 | */ | |
1478 | #define zone_idx(zone) ((zone) - (zone)->zone_pgdat->node_zones) | |
1479 | ||
1f90a347 DW |
1480 | #ifdef CONFIG_ZONE_DEVICE |
1481 | static inline bool zone_is_zone_device(struct zone *zone) | |
1482 | { | |
1483 | return zone_idx(zone) == ZONE_DEVICE; | |
1484 | } | |
1485 | #else | |
1486 | static inline bool zone_is_zone_device(struct zone *zone) | |
1487 | { | |
1488 | return false; | |
1489 | } | |
1490 | #endif | |
1491 | ||
6aa303de MG |
1492 | /* |
1493 | * Returns true if a zone has pages managed by the buddy allocator. | |
1494 | * All the reclaim decisions have to use this function rather than | |
1495 | * populated_zone(). If the whole zone is reserved then we can easily | |
1496 | * end up with populated_zone() && !managed_zone(). | |
1497 | */ | |
1498 | static inline bool managed_zone(struct zone *zone) | |
1499 | { | |
9705bea5 | 1500 | return zone_managed_pages(zone); |
6aa303de MG |
1501 | } |
1502 | ||
1503 | /* Returns true if a zone has memory */ | |
1504 | static inline bool populated_zone(struct zone *zone) | |
f3fe6512 | 1505 | { |
6aa303de | 1506 | return zone->present_pages; |
f3fe6512 CK |
1507 | } |
1508 | ||
c1093b74 PT |
1509 | #ifdef CONFIG_NUMA |
1510 | static inline int zone_to_nid(struct zone *zone) | |
1511 | { | |
1512 | return zone->node; | |
1513 | } | |
1514 | ||
1515 | static inline void zone_set_nid(struct zone *zone, int nid) | |
1516 | { | |
1517 | zone->node = nid; | |
1518 | } | |
1519 | #else | |
1520 | static inline int zone_to_nid(struct zone *zone) | |
1521 | { | |
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | static inline void zone_set_nid(struct zone *zone, int nid) {} | |
1526 | #endif | |
1527 | ||
2a1e274a MG |
1528 | extern int movable_zone; |
1529 | ||
2f1b6248 | 1530 | static inline int is_highmem_idx(enum zone_type idx) |
1da177e4 | 1531 | { |
e53ef38d | 1532 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 1533 | return (idx == ZONE_HIGHMEM || |
b19bd1c9 | 1534 | (idx == ZONE_MOVABLE && movable_zone == ZONE_HIGHMEM)); |
e53ef38d CL |
1535 | #else |
1536 | return 0; | |
1537 | #endif | |
1da177e4 LT |
1538 | } |
1539 | ||
1da177e4 | 1540 | /** |
b4a991ec | 1541 | * is_highmem - helper function to quickly check if a struct zone is a |
1da177e4 LT |
1542 | * highmem zone or not. This is an attempt to keep references |
1543 | * to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum. | |
198fba41 MR |
1544 | * @zone: pointer to struct zone variable |
1545 | * Return: 1 for a highmem zone, 0 otherwise | |
1da177e4 LT |
1546 | */ |
1547 | static inline int is_highmem(struct zone *zone) | |
1548 | { | |
29f9cb53 | 1549 | return is_highmem_idx(zone_idx(zone)); |
bb077c3f KW |
1550 | } |
1551 | ||
1552 | #ifdef CONFIG_ZONE_DMA | |
1553 | bool has_managed_dma(void); | |
e53ef38d | 1554 | #else |
bb077c3f KW |
1555 | static inline bool has_managed_dma(void) |
1556 | { | |
1557 | return false; | |
1da177e4 | 1558 | } |
bb077c3f | 1559 | #endif |
1da177e4 | 1560 | |
f0c0b2b8 | 1561 | |
a9ee6cf5 | 1562 | #ifndef CONFIG_NUMA |
1da177e4 LT |
1563 | |
1564 | extern struct pglist_data contig_page_data; | |
351de44f MG |
1565 | static inline struct pglist_data *NODE_DATA(int nid) |
1566 | { | |
1567 | return &contig_page_data; | |
1568 | } | |
1da177e4 | 1569 | |
a9ee6cf5 | 1570 | #else /* CONFIG_NUMA */ |
1da177e4 LT |
1571 | |
1572 | #include <asm/mmzone.h> | |
1573 | ||
a9ee6cf5 | 1574 | #endif /* !CONFIG_NUMA */ |
348f8b6c | 1575 | |
95144c78 KH |
1576 | extern struct pglist_data *first_online_pgdat(void); |
1577 | extern struct pglist_data *next_online_pgdat(struct pglist_data *pgdat); | |
1578 | extern struct zone *next_zone(struct zone *zone); | |
8357f869 KH |
1579 | |
1580 | /** | |
12d15f0d | 1581 | * for_each_online_pgdat - helper macro to iterate over all online nodes |
198fba41 | 1582 | * @pgdat: pointer to a pg_data_t variable |
8357f869 KH |
1583 | */ |
1584 | #define for_each_online_pgdat(pgdat) \ | |
1585 | for (pgdat = first_online_pgdat(); \ | |
1586 | pgdat; \ | |
1587 | pgdat = next_online_pgdat(pgdat)) | |
8357f869 KH |
1588 | /** |
1589 | * for_each_zone - helper macro to iterate over all memory zones | |
198fba41 | 1590 | * @zone: pointer to struct zone variable |
8357f869 KH |
1591 | * |
1592 | * The user only needs to declare the zone variable, for_each_zone | |
1593 | * fills it in. | |
1594 | */ | |
1595 | #define for_each_zone(zone) \ | |
1596 | for (zone = (first_online_pgdat())->node_zones; \ | |
1597 | zone; \ | |
1598 | zone = next_zone(zone)) | |
1599 | ||
ee99c71c KM |
1600 | #define for_each_populated_zone(zone) \ |
1601 | for (zone = (first_online_pgdat())->node_zones; \ | |
1602 | zone; \ | |
1603 | zone = next_zone(zone)) \ | |
1604 | if (!populated_zone(zone)) \ | |
1605 | ; /* do nothing */ \ | |
1606 | else | |
1607 | ||
dd1a239f MG |
1608 | static inline struct zone *zonelist_zone(struct zoneref *zoneref) |
1609 | { | |
1610 | return zoneref->zone; | |
1611 | } | |
1612 | ||
1613 | static inline int zonelist_zone_idx(struct zoneref *zoneref) | |
1614 | { | |
1615 | return zoneref->zone_idx; | |
1616 | } | |
1617 | ||
1618 | static inline int zonelist_node_idx(struct zoneref *zoneref) | |
1619 | { | |
c1093b74 | 1620 | return zone_to_nid(zoneref->zone); |
dd1a239f MG |
1621 | } |
1622 | ||
682a3385 MG |
1623 | struct zoneref *__next_zones_zonelist(struct zoneref *z, |
1624 | enum zone_type highest_zoneidx, | |
1625 | nodemask_t *nodes); | |
1626 | ||
19770b32 MG |
1627 | /** |
1628 | * 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 |
1629 | * @z: The cursor used as a starting point for the search |
1630 | * @highest_zoneidx: The zone index of the highest zone to return | |
1631 | * @nodes: An optional nodemask to filter the zonelist with | |
19770b32 MG |
1632 | * |
1633 | * This function returns the next zone at or below a given zone index that is | |
1634 | * within the allowed nodemask using a cursor as the starting point for the | |
5bead2a0 MG |
1635 | * search. The zoneref returned is a cursor that represents the current zone |
1636 | * being examined. It should be advanced by one before calling | |
1637 | * next_zones_zonelist again. | |
198fba41 MR |
1638 | * |
1639 | * Return: the next zone at or below highest_zoneidx within the allowed | |
1640 | * nodemask using a cursor within a zonelist as a starting point | |
19770b32 | 1641 | */ |
682a3385 | 1642 | static __always_inline struct zoneref *next_zones_zonelist(struct zoneref *z, |
19770b32 | 1643 | enum zone_type highest_zoneidx, |
682a3385 MG |
1644 | nodemask_t *nodes) |
1645 | { | |
1646 | if (likely(!nodes && zonelist_zone_idx(z) <= highest_zoneidx)) | |
1647 | return z; | |
1648 | return __next_zones_zonelist(z, highest_zoneidx, nodes); | |
1649 | } | |
dd1a239f | 1650 | |
19770b32 MG |
1651 | /** |
1652 | * first_zones_zonelist - Returns the first zone at or below highest_zoneidx within the allowed nodemask in a zonelist | |
198fba41 MR |
1653 | * @zonelist: The zonelist to search for a suitable zone |
1654 | * @highest_zoneidx: The zone index of the highest zone to return | |
1655 | * @nodes: An optional nodemask to filter the zonelist with | |
19770b32 MG |
1656 | * |
1657 | * This function returns the first zone at or below a given zone index that is | |
1658 | * within the allowed nodemask. The zoneref returned is a cursor that can be | |
5bead2a0 MG |
1659 | * used to iterate the zonelist with next_zones_zonelist by advancing it by |
1660 | * one before calling. | |
ea57485a VB |
1661 | * |
1662 | * When no eligible zone is found, zoneref->zone is NULL (zoneref itself is | |
1663 | * never NULL). This may happen either genuinely, or due to concurrent nodemask | |
1664 | * update due to cpuset modification. | |
198fba41 MR |
1665 | * |
1666 | * Return: Zoneref pointer for the first suitable zone found | |
19770b32 | 1667 | */ |
dd1a239f | 1668 | static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist, |
19770b32 | 1669 | enum zone_type highest_zoneidx, |
c33d6c06 | 1670 | nodemask_t *nodes) |
54a6eb5c | 1671 | { |
c33d6c06 | 1672 | return next_zones_zonelist(zonelist->_zonerefs, |
05891fb0 | 1673 | highest_zoneidx, nodes); |
54a6eb5c MG |
1674 | } |
1675 | ||
19770b32 MG |
1676 | /** |
1677 | * 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 |
1678 | * @zone: The current zone in the iterator |
1679 | * @z: The current pointer within zonelist->_zonerefs being iterated | |
1680 | * @zlist: The zonelist being iterated | |
1681 | * @highidx: The zone index of the highest zone to return | |
1682 | * @nodemask: Nodemask allowed by the allocator | |
19770b32 MG |
1683 | * |
1684 | * This iterator iterates though all zones at or below a given zone index and | |
1685 | * within a given nodemask | |
1686 | */ | |
1687 | #define for_each_zone_zonelist_nodemask(zone, z, zlist, highidx, nodemask) \ | |
c33d6c06 | 1688 | for (z = first_zones_zonelist(zlist, highidx, nodemask), zone = zonelist_zone(z); \ |
19770b32 | 1689 | zone; \ |
05891fb0 | 1690 | z = next_zones_zonelist(++z, highidx, nodemask), \ |
c33d6c06 MG |
1691 | zone = zonelist_zone(z)) |
1692 | ||
30d8ec73 | 1693 | #define for_next_zone_zonelist_nodemask(zone, z, highidx, nodemask) \ |
c33d6c06 MG |
1694 | for (zone = z->zone; \ |
1695 | zone; \ | |
1696 | z = next_zones_zonelist(++z, highidx, nodemask), \ | |
1697 | zone = zonelist_zone(z)) | |
1698 | ||
54a6eb5c MG |
1699 | |
1700 | /** | |
1701 | * for_each_zone_zonelist - helper macro to iterate over valid zones in a zonelist at or below a given zone index | |
198fba41 MR |
1702 | * @zone: The current zone in the iterator |
1703 | * @z: The current pointer within zonelist->zones being iterated | |
1704 | * @zlist: The zonelist being iterated | |
1705 | * @highidx: The zone index of the highest zone to return | |
54a6eb5c MG |
1706 | * |
1707 | * This iterator iterates though all zones at or below a given zone index. | |
1708 | */ | |
1709 | #define for_each_zone_zonelist(zone, z, zlist, highidx) \ | |
19770b32 | 1710 | for_each_zone_zonelist_nodemask(zone, z, zlist, highidx, NULL) |
54a6eb5c | 1711 | |
8ca1b5a4 FT |
1712 | /* Whether the 'nodes' are all movable nodes */ |
1713 | static inline bool movable_only_nodes(nodemask_t *nodes) | |
1714 | { | |
1715 | struct zonelist *zonelist; | |
1716 | struct zoneref *z; | |
1717 | int nid; | |
1718 | ||
1719 | if (nodes_empty(*nodes)) | |
1720 | return false; | |
1721 | ||
1722 | /* | |
1723 | * We can chose arbitrary node from the nodemask to get a | |
1724 | * zonelist as they are interlinked. We just need to find | |
1725 | * at least one zone that can satisfy kernel allocations. | |
1726 | */ | |
1727 | nid = first_node(*nodes); | |
1728 | zonelist = &NODE_DATA(nid)->node_zonelists[ZONELIST_FALLBACK]; | |
1729 | z = first_zones_zonelist(zonelist, ZONE_NORMAL, nodes); | |
1730 | return (!z->zone) ? true : false; | |
1731 | } | |
1732 | ||
1733 | ||
d41dee36 AW |
1734 | #ifdef CONFIG_SPARSEMEM |
1735 | #include <asm/sparsemem.h> | |
1736 | #endif | |
1737 | ||
2bdaf115 AW |
1738 | #ifdef CONFIG_FLATMEM |
1739 | #define pfn_to_nid(pfn) (0) | |
1740 | #endif | |
1741 | ||
d41dee36 AW |
1742 | #ifdef CONFIG_SPARSEMEM |
1743 | ||
1744 | /* | |
d41dee36 AW |
1745 | * PA_SECTION_SHIFT physical address to/from section number |
1746 | * PFN_SECTION_SHIFT pfn to/from section number | |
1747 | */ | |
d41dee36 AW |
1748 | #define PA_SECTION_SHIFT (SECTION_SIZE_BITS) |
1749 | #define PFN_SECTION_SHIFT (SECTION_SIZE_BITS - PAGE_SHIFT) | |
1750 | ||
1751 | #define NR_MEM_SECTIONS (1UL << SECTIONS_SHIFT) | |
1752 | ||
1753 | #define PAGES_PER_SECTION (1UL << PFN_SECTION_SHIFT) | |
1754 | #define PAGE_SECTION_MASK (~(PAGES_PER_SECTION-1)) | |
1755 | ||
835c134e | 1756 | #define SECTION_BLOCKFLAGS_BITS \ |
d9c23400 | 1757 | ((1UL << (PFN_SECTION_SHIFT - pageblock_order)) * NR_PAGEBLOCK_BITS) |
835c134e | 1758 | |
23baf831 | 1759 | #if (MAX_ORDER + PAGE_SHIFT) > SECTION_SIZE_BITS |
d41dee36 AW |
1760 | #error Allocator MAX_ORDER exceeds SECTION_SIZE |
1761 | #endif | |
1762 | ||
1dd2bfc8 YI |
1763 | static inline unsigned long pfn_to_section_nr(unsigned long pfn) |
1764 | { | |
1765 | return pfn >> PFN_SECTION_SHIFT; | |
1766 | } | |
1767 | static inline unsigned long section_nr_to_pfn(unsigned long sec) | |
1768 | { | |
1769 | return sec << PFN_SECTION_SHIFT; | |
1770 | } | |
e3c40f37 | 1771 | |
a539f353 DK |
1772 | #define SECTION_ALIGN_UP(pfn) (((pfn) + PAGES_PER_SECTION - 1) & PAGE_SECTION_MASK) |
1773 | #define SECTION_ALIGN_DOWN(pfn) ((pfn) & PAGE_SECTION_MASK) | |
1774 | ||
f1eca35a | 1775 | #define SUBSECTION_SHIFT 21 |
9ffc1d19 | 1776 | #define SUBSECTION_SIZE (1UL << SUBSECTION_SHIFT) |
f1eca35a DW |
1777 | |
1778 | #define PFN_SUBSECTION_SHIFT (SUBSECTION_SHIFT - PAGE_SHIFT) | |
1779 | #define PAGES_PER_SUBSECTION (1UL << PFN_SUBSECTION_SHIFT) | |
1780 | #define PAGE_SUBSECTION_MASK (~(PAGES_PER_SUBSECTION-1)) | |
1781 | ||
1782 | #if SUBSECTION_SHIFT > SECTION_SIZE_BITS | |
1783 | #error Subsection size exceeds section size | |
1784 | #else | |
1785 | #define SUBSECTIONS_PER_SECTION (1UL << (SECTION_SIZE_BITS - SUBSECTION_SHIFT)) | |
1786 | #endif | |
1787 | ||
a3619190 DW |
1788 | #define SUBSECTION_ALIGN_UP(pfn) ALIGN((pfn), PAGES_PER_SUBSECTION) |
1789 | #define SUBSECTION_ALIGN_DOWN(pfn) ((pfn) & PAGE_SUBSECTION_MASK) | |
1790 | ||
f1eca35a | 1791 | struct mem_section_usage { |
0a9f9f62 | 1792 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
f1eca35a | 1793 | DECLARE_BITMAP(subsection_map, SUBSECTIONS_PER_SECTION); |
0a9f9f62 | 1794 | #endif |
f1eca35a DW |
1795 | /* See declaration of similar field in struct zone */ |
1796 | unsigned long pageblock_flags[0]; | |
1797 | }; | |
1798 | ||
f46edbd1 DW |
1799 | void subsection_map_init(unsigned long pfn, unsigned long nr_pages); |
1800 | ||
d41dee36 | 1801 | struct page; |
eefa864b | 1802 | struct page_ext; |
d41dee36 | 1803 | struct mem_section { |
29751f69 AW |
1804 | /* |
1805 | * This is, logically, a pointer to an array of struct | |
1806 | * pages. However, it is stored with some other magic. | |
1807 | * (see sparse.c::sparse_init_one_section()) | |
1808 | * | |
30c253e6 AW |
1809 | * Additionally during early boot we encode node id of |
1810 | * the location of the section here to guide allocation. | |
1811 | * (see sparse.c::memory_present()) | |
1812 | * | |
29751f69 AW |
1813 | * Making it a UL at least makes someone do a cast |
1814 | * before using it wrong. | |
1815 | */ | |
1816 | unsigned long section_mem_map; | |
5c0e3066 | 1817 | |
f1eca35a | 1818 | struct mem_section_usage *usage; |
eefa864b JK |
1819 | #ifdef CONFIG_PAGE_EXTENSION |
1820 | /* | |
0c9ad804 | 1821 | * If SPARSEMEM, pgdat doesn't have page_ext pointer. We use |
eefa864b JK |
1822 | * section. (see page_ext.h about this.) |
1823 | */ | |
1824 | struct page_ext *page_ext; | |
1825 | unsigned long pad; | |
1826 | #endif | |
55878e88 CS |
1827 | /* |
1828 | * WARNING: mem_section must be a power-of-2 in size for the | |
1829 | * calculation and use of SECTION_ROOT_MASK to make sense. | |
1830 | */ | |
d41dee36 AW |
1831 | }; |
1832 | ||
3e347261 BP |
1833 | #ifdef CONFIG_SPARSEMEM_EXTREME |
1834 | #define SECTIONS_PER_ROOT (PAGE_SIZE / sizeof (struct mem_section)) | |
1835 | #else | |
1836 | #define SECTIONS_PER_ROOT 1 | |
1837 | #endif | |
802f192e | 1838 | |
3e347261 | 1839 | #define SECTION_NR_TO_ROOT(sec) ((sec) / SECTIONS_PER_ROOT) |
0faa5638 | 1840 | #define NR_SECTION_ROOTS DIV_ROUND_UP(NR_MEM_SECTIONS, SECTIONS_PER_ROOT) |
3e347261 | 1841 | #define SECTION_ROOT_MASK (SECTIONS_PER_ROOT - 1) |
802f192e | 1842 | |
3e347261 | 1843 | #ifdef CONFIG_SPARSEMEM_EXTREME |
83e3c487 | 1844 | extern struct mem_section **mem_section; |
802f192e | 1845 | #else |
3e347261 BP |
1846 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]; |
1847 | #endif | |
d41dee36 | 1848 | |
f1eca35a DW |
1849 | static inline unsigned long *section_to_usemap(struct mem_section *ms) |
1850 | { | |
1851 | return ms->usage->pageblock_flags; | |
1852 | } | |
1853 | ||
29751f69 AW |
1854 | static inline struct mem_section *__nr_to_section(unsigned long nr) |
1855 | { | |
a431dbbc WL |
1856 | unsigned long root = SECTION_NR_TO_ROOT(nr); |
1857 | ||
1858 | if (unlikely(root >= NR_SECTION_ROOTS)) | |
1859 | return NULL; | |
1860 | ||
83e3c487 | 1861 | #ifdef CONFIG_SPARSEMEM_EXTREME |
a431dbbc | 1862 | if (!mem_section || !mem_section[root]) |
83e3c487 KS |
1863 | return NULL; |
1864 | #endif | |
a431dbbc | 1865 | return &mem_section[root][nr & SECTION_ROOT_MASK]; |
29751f69 | 1866 | } |
f1eca35a | 1867 | extern size_t mem_section_usage_size(void); |
29751f69 AW |
1868 | |
1869 | /* | |
1870 | * We use the lower bits of the mem_map pointer to store | |
def9b71e PT |
1871 | * a little bit of information. The pointer is calculated |
1872 | * as mem_map - section_nr_to_pfn(pnum). The result is | |
1873 | * aligned to the minimum alignment of the two values: | |
1874 | * 1. All mem_map arrays are page-aligned. | |
1875 | * 2. section_nr_to_pfn() always clears PFN_SECTION_SHIFT | |
1876 | * lowest bits. PFN_SECTION_SHIFT is arch-specific | |
1877 | * (equal SECTION_SIZE_BITS - PAGE_SHIFT), and the | |
1878 | * worst combination is powerpc with 256k pages, | |
1879 | * which results in PFN_SECTION_SHIFT equal 6. | |
ed7802dd MS |
1880 | * To sum it up, at least 6 bits are available on all architectures. |
1881 | * However, we can exceed 6 bits on some other architectures except | |
1882 | * powerpc (e.g. 15 bits are available on x86_64, 13 bits are available | |
1883 | * with the worst case of 64K pages on arm64) if we make sure the | |
1884 | * exceeded bit is not applicable to powerpc. | |
29751f69 | 1885 | */ |
ed7802dd MS |
1886 | enum { |
1887 | SECTION_MARKED_PRESENT_BIT, | |
1888 | SECTION_HAS_MEM_MAP_BIT, | |
1889 | SECTION_IS_ONLINE_BIT, | |
1890 | SECTION_IS_EARLY_BIT, | |
1891 | #ifdef CONFIG_ZONE_DEVICE | |
1892 | SECTION_TAINT_ZONE_DEVICE_BIT, | |
1893 | #endif | |
1894 | SECTION_MAP_LAST_BIT, | |
1895 | }; | |
1896 | ||
1897 | #define SECTION_MARKED_PRESENT BIT(SECTION_MARKED_PRESENT_BIT) | |
1898 | #define SECTION_HAS_MEM_MAP BIT(SECTION_HAS_MEM_MAP_BIT) | |
1899 | #define SECTION_IS_ONLINE BIT(SECTION_IS_ONLINE_BIT) | |
1900 | #define SECTION_IS_EARLY BIT(SECTION_IS_EARLY_BIT) | |
1901 | #ifdef CONFIG_ZONE_DEVICE | |
1902 | #define SECTION_TAINT_ZONE_DEVICE BIT(SECTION_TAINT_ZONE_DEVICE_BIT) | |
1903 | #endif | |
1904 | #define SECTION_MAP_MASK (~(BIT(SECTION_MAP_LAST_BIT) - 1)) | |
1905 | #define SECTION_NID_SHIFT SECTION_MAP_LAST_BIT | |
29751f69 AW |
1906 | |
1907 | static inline struct page *__section_mem_map_addr(struct mem_section *section) | |
1908 | { | |
1909 | unsigned long map = section->section_mem_map; | |
1910 | map &= SECTION_MAP_MASK; | |
1911 | return (struct page *)map; | |
1912 | } | |
1913 | ||
540557b9 | 1914 | static inline int present_section(struct mem_section *section) |
29751f69 | 1915 | { |
802f192e | 1916 | return (section && (section->section_mem_map & SECTION_MARKED_PRESENT)); |
29751f69 AW |
1917 | } |
1918 | ||
540557b9 AW |
1919 | static inline int present_section_nr(unsigned long nr) |
1920 | { | |
1921 | return present_section(__nr_to_section(nr)); | |
1922 | } | |
1923 | ||
1924 | static inline int valid_section(struct mem_section *section) | |
29751f69 | 1925 | { |
802f192e | 1926 | return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP)); |
29751f69 AW |
1927 | } |
1928 | ||
326e1b8f DW |
1929 | static inline int early_section(struct mem_section *section) |
1930 | { | |
1931 | return (section && (section->section_mem_map & SECTION_IS_EARLY)); | |
1932 | } | |
1933 | ||
29751f69 AW |
1934 | static inline int valid_section_nr(unsigned long nr) |
1935 | { | |
1936 | return valid_section(__nr_to_section(nr)); | |
1937 | } | |
1938 | ||
2d070eab MH |
1939 | static inline int online_section(struct mem_section *section) |
1940 | { | |
1941 | return (section && (section->section_mem_map & SECTION_IS_ONLINE)); | |
1942 | } | |
1943 | ||
ed7802dd | 1944 | #ifdef CONFIG_ZONE_DEVICE |
1f90a347 DW |
1945 | static inline int online_device_section(struct mem_section *section) |
1946 | { | |
1947 | unsigned long flags = SECTION_IS_ONLINE | SECTION_TAINT_ZONE_DEVICE; | |
1948 | ||
1949 | return section && ((section->section_mem_map & flags) == flags); | |
1950 | } | |
ed7802dd MS |
1951 | #else |
1952 | static inline int online_device_section(struct mem_section *section) | |
1953 | { | |
1954 | return 0; | |
1955 | } | |
1956 | #endif | |
1f90a347 | 1957 | |
2d070eab MH |
1958 | static inline int online_section_nr(unsigned long nr) |
1959 | { | |
1960 | return online_section(__nr_to_section(nr)); | |
1961 | } | |
1962 | ||
1963 | #ifdef CONFIG_MEMORY_HOTPLUG | |
1964 | void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn); | |
2d070eab MH |
1965 | void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn); |
1966 | #endif | |
2d070eab | 1967 | |
d41dee36 AW |
1968 | static inline struct mem_section *__pfn_to_section(unsigned long pfn) |
1969 | { | |
29751f69 | 1970 | return __nr_to_section(pfn_to_section_nr(pfn)); |
d41dee36 AW |
1971 | } |
1972 | ||
2491f0a2 | 1973 | extern unsigned long __highest_present_section_nr; |
c4e1be9e | 1974 | |
f46edbd1 DW |
1975 | static inline int subsection_map_index(unsigned long pfn) |
1976 | { | |
1977 | return (pfn & ~(PAGE_SECTION_MASK)) / PAGES_PER_SUBSECTION; | |
1978 | } | |
1979 | ||
1980 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
1981 | static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) | |
1982 | { | |
1983 | int idx = subsection_map_index(pfn); | |
1984 | ||
1985 | return test_bit(idx, ms->usage->subsection_map); | |
1986 | } | |
1987 | #else | |
1988 | static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) | |
1989 | { | |
1990 | return 1; | |
1991 | } | |
1992 | #endif | |
1993 | ||
7b7bf499 | 1994 | #ifndef CONFIG_HAVE_ARCH_PFN_VALID |
51c656ae MR |
1995 | /** |
1996 | * pfn_valid - check if there is a valid memory map entry for a PFN | |
1997 | * @pfn: the page frame number to check | |
1998 | * | |
1999 | * Check if there is a valid memory map entry aka struct page for the @pfn. | |
2000 | * Note, that availability of the memory map entry does not imply that | |
2001 | * there is actual usable memory at that @pfn. The struct page may | |
2002 | * represent a hole or an unusable page frame. | |
2003 | * | |
2004 | * Return: 1 for PFNs that have memory map entries and 0 otherwise | |
2005 | */ | |
d41dee36 AW |
2006 | static inline int pfn_valid(unsigned long pfn) |
2007 | { | |
f46edbd1 DW |
2008 | struct mem_section *ms; |
2009 | ||
16c9afc7 AK |
2010 | /* |
2011 | * Ensure the upper PAGE_SHIFT bits are clear in the | |
2012 | * pfn. Else it might lead to false positives when | |
2013 | * some of the upper bits are set, but the lower bits | |
2014 | * match a valid pfn. | |
2015 | */ | |
2016 | if (PHYS_PFN(PFN_PHYS(pfn)) != pfn) | |
2017 | return 0; | |
2018 | ||
d41dee36 AW |
2019 | if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) |
2020 | return 0; | |
f1dc0db2 | 2021 | ms = __pfn_to_section(pfn); |
f46edbd1 DW |
2022 | if (!valid_section(ms)) |
2023 | return 0; | |
2024 | /* | |
2025 | * Traditionally early sections always returned pfn_valid() for | |
2026 | * the entire section-sized span. | |
2027 | */ | |
2028 | return early_section(ms) || pfn_section_valid(ms, pfn); | |
d41dee36 | 2029 | } |
7b7bf499 | 2030 | #endif |
d41dee36 | 2031 | |
e03d1f78 | 2032 | static inline int pfn_in_present_section(unsigned long pfn) |
540557b9 AW |
2033 | { |
2034 | if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) | |
2035 | return 0; | |
f1dc0db2 | 2036 | return present_section(__pfn_to_section(pfn)); |
540557b9 AW |
2037 | } |
2038 | ||
4c605881 DH |
2039 | static inline unsigned long next_present_section_nr(unsigned long section_nr) |
2040 | { | |
2041 | while (++section_nr <= __highest_present_section_nr) { | |
2042 | if (present_section_nr(section_nr)) | |
2043 | return section_nr; | |
2044 | } | |
2045 | ||
2046 | return -1; | |
2047 | } | |
2048 | ||
d41dee36 AW |
2049 | /* |
2050 | * These are _only_ used during initialisation, therefore they | |
2051 | * can use __initdata ... They could have names to indicate | |
2052 | * this restriction. | |
2053 | */ | |
2054 | #ifdef CONFIG_NUMA | |
161599ff AW |
2055 | #define pfn_to_nid(pfn) \ |
2056 | ({ \ | |
2057 | unsigned long __pfn_to_nid_pfn = (pfn); \ | |
2058 | page_to_nid(pfn_to_page(__pfn_to_nid_pfn)); \ | |
2059 | }) | |
2bdaf115 AW |
2060 | #else |
2061 | #define pfn_to_nid(pfn) (0) | |
d41dee36 AW |
2062 | #endif |
2063 | ||
d41dee36 AW |
2064 | void sparse_init(void); |
2065 | #else | |
2066 | #define sparse_init() do {} while (0) | |
28ae55c9 | 2067 | #define sparse_index_init(_sec, _nid) do {} while (0) |
e03d1f78 | 2068 | #define pfn_in_present_section pfn_valid |
f46edbd1 | 2069 | #define subsection_map_init(_pfn, _nr_pages) do {} while (0) |
d41dee36 AW |
2070 | #endif /* CONFIG_SPARSEMEM */ |
2071 | ||
97965478 | 2072 | #endif /* !__GENERATING_BOUNDS.H */ |
1da177e4 | 2073 | #endif /* !__ASSEMBLY__ */ |
1da177e4 | 2074 | #endif /* _LINUX_MMZONE_H */ |