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8cdea7c0 BS |
1 | /* memcontrol.h - Memory Controller |
2 | * | |
3 | * Copyright IBM Corporation, 2007 | |
4 | * Author Balbir Singh <balbir@linux.vnet.ibm.com> | |
5 | * | |
78fb7466 PE |
6 | * Copyright 2007 OpenVZ SWsoft Inc |
7 | * Author: Pavel Emelianov <xemul@openvz.org> | |
8 | * | |
8cdea7c0 BS |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | */ | |
19 | ||
20 | #ifndef _LINUX_MEMCONTROL_H | |
21 | #define _LINUX_MEMCONTROL_H | |
f8d66542 | 22 | #include <linux/cgroup.h> |
456f998e | 23 | #include <linux/vm_event_item.h> |
7ae1e1d0 | 24 | #include <linux/hardirq.h> |
a8964b9b | 25 | #include <linux/jump_label.h> |
456f998e | 26 | |
78fb7466 PE |
27 | struct mem_cgroup; |
28 | struct page_cgroup; | |
8697d331 BS |
29 | struct page; |
30 | struct mm_struct; | |
2633d7a0 | 31 | struct kmem_cache; |
78fb7466 | 32 | |
2a7106f2 GT |
33 | /* Stats that can be updated by kernel. */ |
34 | enum mem_cgroup_page_stat_item { | |
35 | MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */ | |
36 | }; | |
37 | ||
5660048c JW |
38 | struct mem_cgroup_reclaim_cookie { |
39 | struct zone *zone; | |
40 | int priority; | |
41 | unsigned int generation; | |
42 | }; | |
43 | ||
c255a458 | 44 | #ifdef CONFIG_MEMCG |
2c26fdd7 KH |
45 | /* |
46 | * All "charge" functions with gfp_mask should use GFP_KERNEL or | |
47 | * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't | |
48 | * alloc memory but reclaims memory from all available zones. So, "where I want | |
49 | * memory from" bits of gfp_mask has no meaning. So any bits of that field is | |
50 | * available but adding a rule is better. charge functions' gfp_mask should | |
51 | * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous | |
52 | * codes. | |
53 | * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.) | |
54 | */ | |
78fb7466 | 55 | |
7a81b88c | 56 | extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm, |
e1a1cd59 | 57 | gfp_t gfp_mask); |
7a81b88c | 58 | /* for swap handling */ |
8c7c6e34 | 59 | extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
72835c86 | 60 | struct page *page, gfp_t mask, struct mem_cgroup **memcgp); |
7a81b88c | 61 | extern void mem_cgroup_commit_charge_swapin(struct page *page, |
72835c86 JW |
62 | struct mem_cgroup *memcg); |
63 | extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg); | |
7a81b88c | 64 | |
8289546e HD |
65 | extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, |
66 | gfp_t gfp_mask); | |
925b7673 JW |
67 | |
68 | struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); | |
fa9add64 | 69 | struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); |
569b846d KH |
70 | |
71 | /* For coalescing uncharge for reducing memcg' overhead*/ | |
72 | extern void mem_cgroup_uncharge_start(void); | |
73 | extern void mem_cgroup_uncharge_end(void); | |
74 | ||
3c541e14 | 75 | extern void mem_cgroup_uncharge_page(struct page *page); |
69029cd5 | 76 | extern void mem_cgroup_uncharge_cache_page(struct page *page); |
c9b0ed51 | 77 | |
c3ac9a8a JW |
78 | bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg, |
79 | struct mem_cgroup *memcg); | |
c0ff4b85 | 80 | int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg); |
3062fc67 | 81 | |
e42d9d5d | 82 | extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); |
cf475ad2 | 83 | extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); |
a433658c | 84 | extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm); |
cf475ad2 | 85 | |
e1aab161 | 86 | extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg); |
d1a4c0b3 | 87 | extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont); |
e1aab161 | 88 | |
2e4d4091 | 89 | static inline |
587af308 | 90 | bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg) |
2e4d4091 | 91 | { |
587af308 JW |
92 | struct mem_cgroup *task_memcg; |
93 | bool match; | |
c3ac9a8a | 94 | |
2e4d4091 | 95 | rcu_read_lock(); |
587af308 JW |
96 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
97 | match = __mem_cgroup_same_or_subtree(memcg, task_memcg); | |
2e4d4091 | 98 | rcu_read_unlock(); |
c3ac9a8a | 99 | return match; |
2e4d4091 | 100 | } |
8a9f3ccd | 101 | |
c0ff4b85 | 102 | extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg); |
d324236b | 103 | |
0030f535 JW |
104 | extern void |
105 | mem_cgroup_prepare_migration(struct page *page, struct page *newpage, | |
106 | struct mem_cgroup **memcgp); | |
c0ff4b85 | 107 | extern void mem_cgroup_end_migration(struct mem_cgroup *memcg, |
50de1dd9 | 108 | struct page *oldpage, struct page *newpage, bool migration_ok); |
ae41be37 | 109 | |
5660048c JW |
110 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, |
111 | struct mem_cgroup *, | |
112 | struct mem_cgroup_reclaim_cookie *); | |
113 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); | |
114 | ||
58ae83db KH |
115 | /* |
116 | * For memory reclaim. | |
117 | */ | |
c56d5c7d KK |
118 | int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec); |
119 | int mem_cgroup_inactive_file_is_low(struct lruvec *lruvec); | |
889976db | 120 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); |
4d7dcca2 | 121 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list); |
fa9add64 | 122 | void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int); |
e222432b BS |
123 | extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, |
124 | struct task_struct *p); | |
ab936cbc KH |
125 | extern void mem_cgroup_replace_page_cache(struct page *oldpage, |
126 | struct page *newpage); | |
58ae83db | 127 | |
c255a458 | 128 | #ifdef CONFIG_MEMCG_SWAP |
c077719b KH |
129 | extern int do_swap_account; |
130 | #endif | |
f8d66542 HT |
131 | |
132 | static inline bool mem_cgroup_disabled(void) | |
133 | { | |
134 | if (mem_cgroup_subsys.disabled) | |
135 | return true; | |
136 | return false; | |
137 | } | |
138 | ||
89c06bd5 KH |
139 | void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked, |
140 | unsigned long *flags); | |
141 | ||
4331f7d3 KH |
142 | extern atomic_t memcg_moving; |
143 | ||
89c06bd5 KH |
144 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, |
145 | bool *locked, unsigned long *flags) | |
146 | { | |
147 | if (mem_cgroup_disabled()) | |
148 | return; | |
149 | rcu_read_lock(); | |
150 | *locked = false; | |
4331f7d3 KH |
151 | if (atomic_read(&memcg_moving)) |
152 | __mem_cgroup_begin_update_page_stat(page, locked, flags); | |
89c06bd5 KH |
153 | } |
154 | ||
155 | void __mem_cgroup_end_update_page_stat(struct page *page, | |
156 | unsigned long *flags); | |
157 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
158 | bool *locked, unsigned long *flags) | |
159 | { | |
160 | if (mem_cgroup_disabled()) | |
161 | return; | |
162 | if (*locked) | |
163 | __mem_cgroup_end_update_page_stat(page, flags); | |
164 | rcu_read_unlock(); | |
165 | } | |
166 | ||
2a7106f2 GT |
167 | void mem_cgroup_update_page_stat(struct page *page, |
168 | enum mem_cgroup_page_stat_item idx, | |
169 | int val); | |
170 | ||
171 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
172 | enum mem_cgroup_page_stat_item idx) | |
173 | { | |
174 | mem_cgroup_update_page_stat(page, idx, 1); | |
175 | } | |
176 | ||
177 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
178 | enum mem_cgroup_page_stat_item idx) | |
179 | { | |
180 | mem_cgroup_update_page_stat(page, idx, -1); | |
181 | } | |
182 | ||
4e416953 | 183 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
0ae5e89c YH |
184 | gfp_t gfp_mask, |
185 | unsigned long *total_scanned); | |
a63d83f4 | 186 | |
68ae564b DR |
187 | void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); |
188 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, | |
189 | enum vm_event_item idx) | |
190 | { | |
191 | if (mem_cgroup_disabled()) | |
192 | return; | |
193 | __mem_cgroup_count_vm_event(mm, idx); | |
194 | } | |
ca3e0214 | 195 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e94c8a9c | 196 | void mem_cgroup_split_huge_fixup(struct page *head); |
ca3e0214 KH |
197 | #endif |
198 | ||
f212ad7c DN |
199 | #ifdef CONFIG_DEBUG_VM |
200 | bool mem_cgroup_bad_page_check(struct page *page); | |
201 | void mem_cgroup_print_bad_page(struct page *page); | |
202 | #endif | |
c255a458 | 203 | #else /* CONFIG_MEMCG */ |
7a81b88c KH |
204 | struct mem_cgroup; |
205 | ||
206 | static inline int mem_cgroup_newpage_charge(struct page *page, | |
8289546e | 207 | struct mm_struct *mm, gfp_t gfp_mask) |
8a9f3ccd BS |
208 | { |
209 | return 0; | |
210 | } | |
211 | ||
8289546e HD |
212 | static inline int mem_cgroup_cache_charge(struct page *page, |
213 | struct mm_struct *mm, gfp_t gfp_mask) | |
8a9f3ccd | 214 | { |
8289546e | 215 | return 0; |
8a9f3ccd BS |
216 | } |
217 | ||
8c7c6e34 | 218 | static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
72835c86 | 219 | struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp) |
7a81b88c KH |
220 | { |
221 | return 0; | |
222 | } | |
223 | ||
224 | static inline void mem_cgroup_commit_charge_swapin(struct page *page, | |
72835c86 | 225 | struct mem_cgroup *memcg) |
7a81b88c KH |
226 | { |
227 | } | |
228 | ||
72835c86 | 229 | static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg) |
7a81b88c KH |
230 | { |
231 | } | |
232 | ||
569b846d KH |
233 | static inline void mem_cgroup_uncharge_start(void) |
234 | { | |
235 | } | |
236 | ||
237 | static inline void mem_cgroup_uncharge_end(void) | |
238 | { | |
239 | } | |
240 | ||
8a9f3ccd BS |
241 | static inline void mem_cgroup_uncharge_page(struct page *page) |
242 | { | |
243 | } | |
244 | ||
69029cd5 KH |
245 | static inline void mem_cgroup_uncharge_cache_page(struct page *page) |
246 | { | |
247 | } | |
248 | ||
925b7673 JW |
249 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, |
250 | struct mem_cgroup *memcg) | |
08e552c6 | 251 | { |
925b7673 | 252 | return &zone->lruvec; |
08e552c6 KH |
253 | } |
254 | ||
fa9add64 HD |
255 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, |
256 | struct zone *zone) | |
66e1707b | 257 | { |
925b7673 | 258 | return &zone->lruvec; |
66e1707b BS |
259 | } |
260 | ||
e42d9d5d WF |
261 | static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) |
262 | { | |
263 | return NULL; | |
264 | } | |
265 | ||
a433658c KM |
266 | static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) |
267 | { | |
268 | return NULL; | |
269 | } | |
270 | ||
587af308 | 271 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
c0ff4b85 | 272 | struct mem_cgroup *memcg) |
bed7161a | 273 | { |
587af308 | 274 | return true; |
bed7161a BS |
275 | } |
276 | ||
4c4a2214 | 277 | static inline int task_in_mem_cgroup(struct task_struct *task, |
c0ff4b85 | 278 | const struct mem_cgroup *memcg) |
4c4a2214 DR |
279 | { |
280 | return 1; | |
281 | } | |
282 | ||
c0ff4b85 R |
283 | static inline struct cgroup_subsys_state |
284 | *mem_cgroup_css(struct mem_cgroup *memcg) | |
d324236b WF |
285 | { |
286 | return NULL; | |
287 | } | |
288 | ||
0030f535 | 289 | static inline void |
ac39cf8c | 290 | mem_cgroup_prepare_migration(struct page *page, struct page *newpage, |
0030f535 | 291 | struct mem_cgroup **memcgp) |
ae41be37 | 292 | { |
ae41be37 KH |
293 | } |
294 | ||
c0ff4b85 | 295 | static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg, |
50de1dd9 | 296 | struct page *oldpage, struct page *newpage, bool migration_ok) |
ae41be37 KH |
297 | { |
298 | } | |
299 | ||
5660048c JW |
300 | static inline struct mem_cgroup * |
301 | mem_cgroup_iter(struct mem_cgroup *root, | |
302 | struct mem_cgroup *prev, | |
303 | struct mem_cgroup_reclaim_cookie *reclaim) | |
304 | { | |
305 | return NULL; | |
306 | } | |
307 | ||
308 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
309 | struct mem_cgroup *prev) | |
310 | { | |
311 | } | |
312 | ||
f8d66542 HT |
313 | static inline bool mem_cgroup_disabled(void) |
314 | { | |
315 | return true; | |
316 | } | |
a636b327 | 317 | |
14797e23 | 318 | static inline int |
c56d5c7d | 319 | mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) |
14797e23 KM |
320 | { |
321 | return 1; | |
322 | } | |
323 | ||
56e49d21 | 324 | static inline int |
c56d5c7d | 325 | mem_cgroup_inactive_file_is_low(struct lruvec *lruvec) |
56e49d21 RR |
326 | { |
327 | return 1; | |
328 | } | |
329 | ||
a3d8e054 | 330 | static inline unsigned long |
4d7dcca2 | 331 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
a3d8e054 KM |
332 | { |
333 | return 0; | |
334 | } | |
335 | ||
fa9add64 HD |
336 | static inline void |
337 | mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
338 | int increment) | |
3e2f41f1 | 339 | { |
3e2f41f1 KM |
340 | } |
341 | ||
e222432b BS |
342 | static inline void |
343 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
344 | { | |
345 | } | |
346 | ||
89c06bd5 KH |
347 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, |
348 | bool *locked, unsigned long *flags) | |
349 | { | |
350 | } | |
351 | ||
352 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
353 | bool *locked, unsigned long *flags) | |
354 | { | |
355 | } | |
356 | ||
2a7106f2 GT |
357 | static inline void mem_cgroup_inc_page_stat(struct page *page, |
358 | enum mem_cgroup_page_stat_item idx) | |
359 | { | |
360 | } | |
361 | ||
362 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
363 | enum mem_cgroup_page_stat_item idx) | |
d69b042f BS |
364 | { |
365 | } | |
366 | ||
4e416953 BS |
367 | static inline |
368 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, | |
0ae5e89c YH |
369 | gfp_t gfp_mask, |
370 | unsigned long *total_scanned) | |
4e416953 BS |
371 | { |
372 | return 0; | |
373 | } | |
374 | ||
e94c8a9c | 375 | static inline void mem_cgroup_split_huge_fixup(struct page *head) |
ca3e0214 KH |
376 | { |
377 | } | |
378 | ||
456f998e YH |
379 | static inline |
380 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
381 | { | |
382 | } | |
ab936cbc KH |
383 | static inline void mem_cgroup_replace_page_cache(struct page *oldpage, |
384 | struct page *newpage) | |
385 | { | |
386 | } | |
c255a458 | 387 | #endif /* CONFIG_MEMCG */ |
78fb7466 | 388 | |
c255a458 | 389 | #if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM) |
f212ad7c DN |
390 | static inline bool |
391 | mem_cgroup_bad_page_check(struct page *page) | |
392 | { | |
393 | return false; | |
394 | } | |
395 | ||
396 | static inline void | |
397 | mem_cgroup_print_bad_page(struct page *page) | |
398 | { | |
399 | } | |
400 | #endif | |
401 | ||
e1aab161 GC |
402 | enum { |
403 | UNDER_LIMIT, | |
404 | SOFT_LIMIT, | |
405 | OVER_LIMIT, | |
406 | }; | |
407 | ||
408 | struct sock; | |
cd59085a | 409 | #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM) |
e1aab161 GC |
410 | void sock_update_memcg(struct sock *sk); |
411 | void sock_release_memcg(struct sock *sk); | |
412 | #else | |
413 | static inline void sock_update_memcg(struct sock *sk) | |
414 | { | |
415 | } | |
416 | static inline void sock_release_memcg(struct sock *sk) | |
417 | { | |
418 | } | |
cd59085a | 419 | #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */ |
7ae1e1d0 GC |
420 | |
421 | #ifdef CONFIG_MEMCG_KMEM | |
a8964b9b | 422 | extern struct static_key memcg_kmem_enabled_key; |
749c5415 GC |
423 | |
424 | extern int memcg_limited_groups_array_size; | |
ebe945c2 GC |
425 | |
426 | /* | |
427 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
428 | * check if the cache is valid (it is either valid or NULL). | |
429 | * the slab_mutex must be held when looping through those caches | |
430 | */ | |
749c5415 GC |
431 | #define for_each_memcg_cache_index(_idx) \ |
432 | for ((_idx) = 0; i < memcg_limited_groups_array_size; (_idx)++) | |
433 | ||
7ae1e1d0 GC |
434 | static inline bool memcg_kmem_enabled(void) |
435 | { | |
a8964b9b | 436 | return static_key_false(&memcg_kmem_enabled_key); |
7ae1e1d0 GC |
437 | } |
438 | ||
439 | /* | |
440 | * In general, we'll do everything in our power to not incur in any overhead | |
441 | * for non-memcg users for the kmem functions. Not even a function call, if we | |
442 | * can avoid it. | |
443 | * | |
444 | * Therefore, we'll inline all those functions so that in the best case, we'll | |
445 | * see that kmemcg is off for everybody and proceed quickly. If it is on, | |
446 | * we'll still do most of the flag checking inline. We check a lot of | |
447 | * conditions, but because they are pretty simple, they are expected to be | |
448 | * fast. | |
449 | */ | |
450 | bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, | |
451 | int order); | |
452 | void __memcg_kmem_commit_charge(struct page *page, | |
453 | struct mem_cgroup *memcg, int order); | |
454 | void __memcg_kmem_uncharge_pages(struct page *page, int order); | |
455 | ||
2633d7a0 | 456 | int memcg_cache_id(struct mem_cgroup *memcg); |
943a451a GC |
457 | int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s, |
458 | struct kmem_cache *root_cache); | |
2633d7a0 GC |
459 | void memcg_release_cache(struct kmem_cache *cachep); |
460 | void memcg_cache_list_add(struct mem_cgroup *memcg, struct kmem_cache *cachep); | |
461 | ||
55007d84 GC |
462 | int memcg_update_cache_size(struct kmem_cache *s, int num_groups); |
463 | void memcg_update_array_size(int num_groups); | |
d7f25f8a GC |
464 | |
465 | struct kmem_cache * | |
466 | __memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp); | |
467 | ||
1f458cbf | 468 | void mem_cgroup_destroy_cache(struct kmem_cache *cachep); |
7cf27982 | 469 | void kmem_cache_destroy_memcg_children(struct kmem_cache *s); |
1f458cbf | 470 | |
7ae1e1d0 GC |
471 | /** |
472 | * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed. | |
473 | * @gfp: the gfp allocation flags. | |
474 | * @memcg: a pointer to the memcg this was charged against. | |
475 | * @order: allocation order. | |
476 | * | |
477 | * returns true if the memcg where the current task belongs can hold this | |
478 | * allocation. | |
479 | * | |
480 | * We return true automatically if this allocation is not to be accounted to | |
481 | * any memcg. | |
482 | */ | |
483 | static inline bool | |
484 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
485 | { | |
486 | if (!memcg_kmem_enabled()) | |
487 | return true; | |
488 | ||
489 | /* | |
490 | * __GFP_NOFAIL allocations will move on even if charging is not | |
491 | * possible. Therefore we don't even try, and have this allocation | |
492 | * unaccounted. We could in theory charge it with | |
493 | * res_counter_charge_nofail, but we hope those allocations are rare, | |
494 | * and won't be worth the trouble. | |
495 | */ | |
496 | if (!(gfp & __GFP_KMEMCG) || (gfp & __GFP_NOFAIL)) | |
497 | return true; | |
498 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
499 | return true; | |
500 | ||
501 | /* If the test is dying, just let it go. */ | |
502 | if (unlikely(fatal_signal_pending(current))) | |
503 | return true; | |
504 | ||
505 | return __memcg_kmem_newpage_charge(gfp, memcg, order); | |
506 | } | |
507 | ||
508 | /** | |
509 | * memcg_kmem_uncharge_pages: uncharge pages from memcg | |
510 | * @page: pointer to struct page being freed | |
511 | * @order: allocation order. | |
512 | * | |
513 | * there is no need to specify memcg here, since it is embedded in page_cgroup | |
514 | */ | |
515 | static inline void | |
516 | memcg_kmem_uncharge_pages(struct page *page, int order) | |
517 | { | |
518 | if (memcg_kmem_enabled()) | |
519 | __memcg_kmem_uncharge_pages(page, order); | |
520 | } | |
521 | ||
522 | /** | |
523 | * memcg_kmem_commit_charge: embeds correct memcg in a page | |
524 | * @page: pointer to struct page recently allocated | |
525 | * @memcg: the memcg structure we charged against | |
526 | * @order: allocation order. | |
527 | * | |
528 | * Needs to be called after memcg_kmem_newpage_charge, regardless of success or | |
529 | * failure of the allocation. if @page is NULL, this function will revert the | |
530 | * charges. Otherwise, it will commit the memcg given by @memcg to the | |
531 | * corresponding page_cgroup. | |
532 | */ | |
533 | static inline void | |
534 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
535 | { | |
536 | if (memcg_kmem_enabled() && memcg) | |
537 | __memcg_kmem_commit_charge(page, memcg, order); | |
538 | } | |
539 | ||
d7f25f8a GC |
540 | /** |
541 | * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation | |
542 | * @cachep: the original global kmem cache | |
543 | * @gfp: allocation flags. | |
544 | * | |
545 | * This function assumes that the task allocating, which determines the memcg | |
546 | * in the page allocator, belongs to the same cgroup throughout the whole | |
547 | * process. Misacounting can happen if the task calls memcg_kmem_get_cache() | |
548 | * while belonging to a cgroup, and later on changes. This is considered | |
549 | * acceptable, and should only happen upon task migration. | |
550 | * | |
551 | * Before the cache is created by the memcg core, there is also a possible | |
552 | * imbalance: the task belongs to a memcg, but the cache being allocated from | |
553 | * is the global cache, since the child cache is not yet guaranteed to be | |
554 | * ready. This case is also fine, since in this case the GFP_KMEMCG will not be | |
555 | * passed and the page allocator will not attempt any cgroup accounting. | |
556 | */ | |
557 | static __always_inline struct kmem_cache * | |
558 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
559 | { | |
560 | if (!memcg_kmem_enabled()) | |
561 | return cachep; | |
562 | if (gfp & __GFP_NOFAIL) | |
563 | return cachep; | |
564 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
565 | return cachep; | |
566 | if (unlikely(fatal_signal_pending(current))) | |
567 | return cachep; | |
568 | ||
569 | return __memcg_kmem_get_cache(cachep, gfp); | |
570 | } | |
7ae1e1d0 | 571 | #else |
749c5415 GC |
572 | #define for_each_memcg_cache_index(_idx) \ |
573 | for (; NULL; ) | |
574 | ||
b9ce5ef4 GC |
575 | static inline bool memcg_kmem_enabled(void) |
576 | { | |
577 | return false; | |
578 | } | |
579 | ||
7ae1e1d0 GC |
580 | static inline bool |
581 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
582 | { | |
583 | return true; | |
584 | } | |
585 | ||
586 | static inline void memcg_kmem_uncharge_pages(struct page *page, int order) | |
587 | { | |
588 | } | |
589 | ||
590 | static inline void | |
591 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
592 | { | |
593 | } | |
2633d7a0 GC |
594 | |
595 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
596 | { | |
597 | return -1; | |
598 | } | |
599 | ||
943a451a GC |
600 | static inline int |
601 | memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s, | |
602 | struct kmem_cache *root_cache) | |
2633d7a0 GC |
603 | { |
604 | return 0; | |
605 | } | |
606 | ||
607 | static inline void memcg_release_cache(struct kmem_cache *cachep) | |
608 | { | |
609 | } | |
610 | ||
611 | static inline void memcg_cache_list_add(struct mem_cgroup *memcg, | |
612 | struct kmem_cache *s) | |
613 | { | |
614 | } | |
d7f25f8a GC |
615 | |
616 | static inline struct kmem_cache * | |
617 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
618 | { | |
619 | return cachep; | |
620 | } | |
7cf27982 GC |
621 | |
622 | static inline void kmem_cache_destroy_memcg_children(struct kmem_cache *s) | |
623 | { | |
624 | } | |
7ae1e1d0 | 625 | #endif /* CONFIG_MEMCG_KMEM */ |
8cdea7c0 BS |
626 | #endif /* _LINUX_MEMCONTROL_H */ |
627 |