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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 | |
68b4876d SZ |
33 | /* |
34 | * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c, | |
35 | * These two lists should keep in accord with each other. | |
36 | */ | |
37 | enum mem_cgroup_stat_index { | |
38 | /* | |
39 | * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. | |
40 | */ | |
41 | MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ | |
42 | MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */ | |
43 | MEM_CGROUP_STAT_RSS_HUGE, /* # of pages charged as anon huge */ | |
44 | MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */ | |
3ea67d06 | 45 | MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */ |
68b4876d SZ |
46 | MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */ |
47 | MEM_CGROUP_STAT_NSTATS, | |
2a7106f2 GT |
48 | }; |
49 | ||
5660048c JW |
50 | struct mem_cgroup_reclaim_cookie { |
51 | struct zone *zone; | |
52 | int priority; | |
53 | unsigned int generation; | |
54 | }; | |
55 | ||
c255a458 | 56 | #ifdef CONFIG_MEMCG |
00501b53 JW |
57 | int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
58 | gfp_t gfp_mask, struct mem_cgroup **memcgp); | |
59 | void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, | |
60 | bool lrucare); | |
61 | void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg); | |
0a31bc97 | 62 | void mem_cgroup_uncharge(struct page *page); |
747db954 | 63 | void mem_cgroup_uncharge_list(struct list_head *page_list); |
569b846d | 64 | |
0a31bc97 JW |
65 | void mem_cgroup_migrate(struct page *oldpage, struct page *newpage, |
66 | bool lrucare); | |
569b846d | 67 | |
0a31bc97 JW |
68 | struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); |
69 | struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); | |
c9b0ed51 | 70 | |
c3ac9a8a JW |
71 | bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg, |
72 | struct mem_cgroup *memcg); | |
ffbdccf5 DR |
73 | bool task_in_mem_cgroup(struct task_struct *task, |
74 | const struct mem_cgroup *memcg); | |
3062fc67 | 75 | |
e42d9d5d | 76 | extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); |
cf475ad2 BS |
77 | extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); |
78 | ||
e1aab161 | 79 | extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg); |
182446d0 | 80 | extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css); |
e1aab161 | 81 | |
2e4d4091 | 82 | static inline |
587af308 | 83 | bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg) |
2e4d4091 | 84 | { |
587af308 JW |
85 | struct mem_cgroup *task_memcg; |
86 | bool match; | |
c3ac9a8a | 87 | |
2e4d4091 | 88 | rcu_read_lock(); |
587af308 JW |
89 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
90 | match = __mem_cgroup_same_or_subtree(memcg, task_memcg); | |
2e4d4091 | 91 | rcu_read_unlock(); |
c3ac9a8a | 92 | return match; |
2e4d4091 | 93 | } |
8a9f3ccd | 94 | |
c0ff4b85 | 95 | extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg); |
d324236b | 96 | |
694fbc0f AM |
97 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, |
98 | struct mem_cgroup *, | |
99 | struct mem_cgroup_reclaim_cookie *); | |
5660048c JW |
100 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); |
101 | ||
58ae83db KH |
102 | /* |
103 | * For memory reclaim. | |
104 | */ | |
c56d5c7d | 105 | int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec); |
889976db | 106 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); |
4d7dcca2 | 107 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list); |
fa9add64 | 108 | void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int); |
e222432b BS |
109 | extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, |
110 | struct task_struct *p); | |
58ae83db | 111 | |
49426420 | 112 | static inline void mem_cgroup_oom_enable(void) |
519e5247 | 113 | { |
49426420 JW |
114 | WARN_ON(current->memcg_oom.may_oom); |
115 | current->memcg_oom.may_oom = 1; | |
519e5247 JW |
116 | } |
117 | ||
49426420 | 118 | static inline void mem_cgroup_oom_disable(void) |
519e5247 | 119 | { |
49426420 JW |
120 | WARN_ON(!current->memcg_oom.may_oom); |
121 | current->memcg_oom.may_oom = 0; | |
519e5247 JW |
122 | } |
123 | ||
3812c8c8 JW |
124 | static inline bool task_in_memcg_oom(struct task_struct *p) |
125 | { | |
49426420 | 126 | return p->memcg_oom.memcg; |
3812c8c8 JW |
127 | } |
128 | ||
49426420 | 129 | bool mem_cgroup_oom_synchronize(bool wait); |
3812c8c8 | 130 | |
c255a458 | 131 | #ifdef CONFIG_MEMCG_SWAP |
c077719b KH |
132 | extern int do_swap_account; |
133 | #endif | |
f8d66542 HT |
134 | |
135 | static inline bool mem_cgroup_disabled(void) | |
136 | { | |
073219e9 | 137 | if (memory_cgrp_subsys.disabled) |
f8d66542 HT |
138 | return true; |
139 | return false; | |
140 | } | |
141 | ||
d7365e78 JW |
142 | struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page, bool *locked, |
143 | unsigned long *flags); | |
144 | void mem_cgroup_end_page_stat(struct mem_cgroup *memcg, bool locked, | |
145 | unsigned long flags); | |
146 | void mem_cgroup_update_page_stat(struct mem_cgroup *memcg, | |
147 | enum mem_cgroup_stat_index idx, int val); | |
148 | ||
149 | static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg, | |
68b4876d | 150 | enum mem_cgroup_stat_index idx) |
2a7106f2 | 151 | { |
d7365e78 | 152 | mem_cgroup_update_page_stat(memcg, idx, 1); |
2a7106f2 GT |
153 | } |
154 | ||
d7365e78 | 155 | static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg, |
68b4876d | 156 | enum mem_cgroup_stat_index idx) |
2a7106f2 | 157 | { |
d7365e78 | 158 | mem_cgroup_update_page_stat(memcg, idx, -1); |
2a7106f2 GT |
159 | } |
160 | ||
0608f43d AM |
161 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
162 | gfp_t gfp_mask, | |
163 | unsigned long *total_scanned); | |
a63d83f4 | 164 | |
68ae564b DR |
165 | void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); |
166 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, | |
167 | enum vm_event_item idx) | |
168 | { | |
169 | if (mem_cgroup_disabled()) | |
170 | return; | |
171 | __mem_cgroup_count_vm_event(mm, idx); | |
172 | } | |
ca3e0214 | 173 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e94c8a9c | 174 | void mem_cgroup_split_huge_fixup(struct page *head); |
ca3e0214 KH |
175 | #endif |
176 | ||
f212ad7c DN |
177 | #ifdef CONFIG_DEBUG_VM |
178 | bool mem_cgroup_bad_page_check(struct page *page); | |
179 | void mem_cgroup_print_bad_page(struct page *page); | |
180 | #endif | |
c255a458 | 181 | #else /* CONFIG_MEMCG */ |
7a81b88c KH |
182 | struct mem_cgroup; |
183 | ||
00501b53 JW |
184 | static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
185 | gfp_t gfp_mask, | |
186 | struct mem_cgroup **memcgp) | |
7a81b88c | 187 | { |
00501b53 | 188 | *memcgp = NULL; |
7a81b88c KH |
189 | return 0; |
190 | } | |
191 | ||
00501b53 JW |
192 | static inline void mem_cgroup_commit_charge(struct page *page, |
193 | struct mem_cgroup *memcg, | |
194 | bool lrucare) | |
7a81b88c KH |
195 | { |
196 | } | |
197 | ||
00501b53 JW |
198 | static inline void mem_cgroup_cancel_charge(struct page *page, |
199 | struct mem_cgroup *memcg) | |
7a81b88c KH |
200 | { |
201 | } | |
202 | ||
0a31bc97 | 203 | static inline void mem_cgroup_uncharge(struct page *page) |
569b846d KH |
204 | { |
205 | } | |
206 | ||
747db954 | 207 | static inline void mem_cgroup_uncharge_list(struct list_head *page_list) |
8a9f3ccd BS |
208 | { |
209 | } | |
210 | ||
0a31bc97 JW |
211 | static inline void mem_cgroup_migrate(struct page *oldpage, |
212 | struct page *newpage, | |
213 | bool lrucare) | |
69029cd5 KH |
214 | { |
215 | } | |
216 | ||
925b7673 JW |
217 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, |
218 | struct mem_cgroup *memcg) | |
08e552c6 | 219 | { |
925b7673 | 220 | return &zone->lruvec; |
08e552c6 KH |
221 | } |
222 | ||
fa9add64 HD |
223 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, |
224 | struct zone *zone) | |
66e1707b | 225 | { |
925b7673 | 226 | return &zone->lruvec; |
66e1707b BS |
227 | } |
228 | ||
e42d9d5d WF |
229 | static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) |
230 | { | |
231 | return NULL; | |
232 | } | |
233 | ||
587af308 | 234 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
c0ff4b85 | 235 | struct mem_cgroup *memcg) |
bed7161a | 236 | { |
587af308 | 237 | return true; |
bed7161a BS |
238 | } |
239 | ||
ffbdccf5 DR |
240 | static inline bool task_in_mem_cgroup(struct task_struct *task, |
241 | const struct mem_cgroup *memcg) | |
4c4a2214 | 242 | { |
ffbdccf5 | 243 | return true; |
4c4a2214 DR |
244 | } |
245 | ||
c0ff4b85 R |
246 | static inline struct cgroup_subsys_state |
247 | *mem_cgroup_css(struct mem_cgroup *memcg) | |
d324236b WF |
248 | { |
249 | return NULL; | |
250 | } | |
251 | ||
5660048c JW |
252 | static inline struct mem_cgroup * |
253 | mem_cgroup_iter(struct mem_cgroup *root, | |
254 | struct mem_cgroup *prev, | |
255 | struct mem_cgroup_reclaim_cookie *reclaim) | |
256 | { | |
257 | return NULL; | |
258 | } | |
259 | ||
260 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
261 | struct mem_cgroup *prev) | |
262 | { | |
263 | } | |
264 | ||
f8d66542 HT |
265 | static inline bool mem_cgroup_disabled(void) |
266 | { | |
267 | return true; | |
268 | } | |
a636b327 | 269 | |
14797e23 | 270 | static inline int |
c56d5c7d | 271 | mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) |
14797e23 KM |
272 | { |
273 | return 1; | |
274 | } | |
275 | ||
a3d8e054 | 276 | static inline unsigned long |
4d7dcca2 | 277 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
a3d8e054 KM |
278 | { |
279 | return 0; | |
280 | } | |
281 | ||
fa9add64 HD |
282 | static inline void |
283 | mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
284 | int increment) | |
3e2f41f1 | 285 | { |
3e2f41f1 KM |
286 | } |
287 | ||
e222432b BS |
288 | static inline void |
289 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
290 | { | |
291 | } | |
292 | ||
d7365e78 | 293 | static inline struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page, |
89c06bd5 KH |
294 | bool *locked, unsigned long *flags) |
295 | { | |
d7365e78 | 296 | return NULL; |
89c06bd5 KH |
297 | } |
298 | ||
d7365e78 JW |
299 | static inline void mem_cgroup_end_page_stat(struct mem_cgroup *memcg, |
300 | bool locked, unsigned long flags) | |
89c06bd5 KH |
301 | { |
302 | } | |
303 | ||
49426420 | 304 | static inline void mem_cgroup_oom_enable(void) |
519e5247 JW |
305 | { |
306 | } | |
307 | ||
49426420 | 308 | static inline void mem_cgroup_oom_disable(void) |
519e5247 JW |
309 | { |
310 | } | |
311 | ||
3812c8c8 JW |
312 | static inline bool task_in_memcg_oom(struct task_struct *p) |
313 | { | |
314 | return false; | |
315 | } | |
316 | ||
49426420 | 317 | static inline bool mem_cgroup_oom_synchronize(bool wait) |
3812c8c8 JW |
318 | { |
319 | return false; | |
320 | } | |
321 | ||
d7365e78 | 322 | static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg, |
68b4876d | 323 | enum mem_cgroup_stat_index idx) |
2a7106f2 GT |
324 | { |
325 | } | |
326 | ||
d7365e78 | 327 | static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg, |
68b4876d | 328 | enum mem_cgroup_stat_index idx) |
d69b042f BS |
329 | { |
330 | } | |
331 | ||
4e416953 | 332 | static inline |
0608f43d AM |
333 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
334 | gfp_t gfp_mask, | |
335 | unsigned long *total_scanned) | |
4e416953 | 336 | { |
0608f43d | 337 | return 0; |
4e416953 BS |
338 | } |
339 | ||
e94c8a9c | 340 | static inline void mem_cgroup_split_huge_fixup(struct page *head) |
ca3e0214 KH |
341 | { |
342 | } | |
343 | ||
456f998e YH |
344 | static inline |
345 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
346 | { | |
347 | } | |
c255a458 | 348 | #endif /* CONFIG_MEMCG */ |
78fb7466 | 349 | |
c255a458 | 350 | #if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM) |
f212ad7c DN |
351 | static inline bool |
352 | mem_cgroup_bad_page_check(struct page *page) | |
353 | { | |
354 | return false; | |
355 | } | |
356 | ||
357 | static inline void | |
358 | mem_cgroup_print_bad_page(struct page *page) | |
359 | { | |
360 | } | |
361 | #endif | |
362 | ||
e1aab161 GC |
363 | enum { |
364 | UNDER_LIMIT, | |
365 | SOFT_LIMIT, | |
366 | OVER_LIMIT, | |
367 | }; | |
368 | ||
369 | struct sock; | |
cd59085a | 370 | #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM) |
e1aab161 GC |
371 | void sock_update_memcg(struct sock *sk); |
372 | void sock_release_memcg(struct sock *sk); | |
373 | #else | |
374 | static inline void sock_update_memcg(struct sock *sk) | |
375 | { | |
376 | } | |
377 | static inline void sock_release_memcg(struct sock *sk) | |
378 | { | |
379 | } | |
cd59085a | 380 | #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */ |
7ae1e1d0 GC |
381 | |
382 | #ifdef CONFIG_MEMCG_KMEM | |
a8964b9b | 383 | extern struct static_key memcg_kmem_enabled_key; |
749c5415 GC |
384 | |
385 | extern int memcg_limited_groups_array_size; | |
ebe945c2 GC |
386 | |
387 | /* | |
388 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
389 | * check if the cache is valid (it is either valid or NULL). | |
390 | * the slab_mutex must be held when looping through those caches | |
391 | */ | |
749c5415 | 392 | #define for_each_memcg_cache_index(_idx) \ |
91c777d8 | 393 | for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++) |
749c5415 | 394 | |
7ae1e1d0 GC |
395 | static inline bool memcg_kmem_enabled(void) |
396 | { | |
a8964b9b | 397 | return static_key_false(&memcg_kmem_enabled_key); |
7ae1e1d0 GC |
398 | } |
399 | ||
400 | /* | |
401 | * In general, we'll do everything in our power to not incur in any overhead | |
402 | * for non-memcg users for the kmem functions. Not even a function call, if we | |
403 | * can avoid it. | |
404 | * | |
405 | * Therefore, we'll inline all those functions so that in the best case, we'll | |
406 | * see that kmemcg is off for everybody and proceed quickly. If it is on, | |
407 | * we'll still do most of the flag checking inline. We check a lot of | |
408 | * conditions, but because they are pretty simple, they are expected to be | |
409 | * fast. | |
410 | */ | |
411 | bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, | |
412 | int order); | |
413 | void __memcg_kmem_commit_charge(struct page *page, | |
414 | struct mem_cgroup *memcg, int order); | |
415 | void __memcg_kmem_uncharge_pages(struct page *page, int order); | |
416 | ||
2633d7a0 | 417 | int memcg_cache_id(struct mem_cgroup *memcg); |
5722d094 | 418 | |
55007d84 | 419 | void memcg_update_array_size(int num_groups); |
d7f25f8a GC |
420 | |
421 | struct kmem_cache * | |
422 | __memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp); | |
423 | ||
c67a8a68 VD |
424 | int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order); |
425 | void __memcg_uncharge_slab(struct kmem_cache *cachep, int order); | |
5dfb4175 | 426 | |
776ed0f0 | 427 | int __memcg_cleanup_cache_params(struct kmem_cache *s); |
1f458cbf | 428 | |
7ae1e1d0 GC |
429 | /** |
430 | * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed. | |
431 | * @gfp: the gfp allocation flags. | |
432 | * @memcg: a pointer to the memcg this was charged against. | |
433 | * @order: allocation order. | |
434 | * | |
435 | * returns true if the memcg where the current task belongs can hold this | |
436 | * allocation. | |
437 | * | |
438 | * We return true automatically if this allocation is not to be accounted to | |
439 | * any memcg. | |
440 | */ | |
441 | static inline bool | |
442 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
443 | { | |
444 | if (!memcg_kmem_enabled()) | |
445 | return true; | |
446 | ||
447 | /* | |
448 | * __GFP_NOFAIL allocations will move on even if charging is not | |
449 | * possible. Therefore we don't even try, and have this allocation | |
3e32cb2e JW |
450 | * unaccounted. We could in theory charge it forcibly, but we hope |
451 | * those allocations are rare, and won't be worth the trouble. | |
7ae1e1d0 | 452 | */ |
52383431 | 453 | if (gfp & __GFP_NOFAIL) |
7ae1e1d0 GC |
454 | return true; |
455 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
456 | return true; | |
457 | ||
458 | /* If the test is dying, just let it go. */ | |
459 | if (unlikely(fatal_signal_pending(current))) | |
460 | return true; | |
461 | ||
462 | return __memcg_kmem_newpage_charge(gfp, memcg, order); | |
463 | } | |
464 | ||
465 | /** | |
466 | * memcg_kmem_uncharge_pages: uncharge pages from memcg | |
467 | * @page: pointer to struct page being freed | |
468 | * @order: allocation order. | |
469 | * | |
470 | * there is no need to specify memcg here, since it is embedded in page_cgroup | |
471 | */ | |
472 | static inline void | |
473 | memcg_kmem_uncharge_pages(struct page *page, int order) | |
474 | { | |
475 | if (memcg_kmem_enabled()) | |
476 | __memcg_kmem_uncharge_pages(page, order); | |
477 | } | |
478 | ||
479 | /** | |
480 | * memcg_kmem_commit_charge: embeds correct memcg in a page | |
481 | * @page: pointer to struct page recently allocated | |
482 | * @memcg: the memcg structure we charged against | |
483 | * @order: allocation order. | |
484 | * | |
485 | * Needs to be called after memcg_kmem_newpage_charge, regardless of success or | |
486 | * failure of the allocation. if @page is NULL, this function will revert the | |
487 | * charges. Otherwise, it will commit the memcg given by @memcg to the | |
488 | * corresponding page_cgroup. | |
489 | */ | |
490 | static inline void | |
491 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
492 | { | |
493 | if (memcg_kmem_enabled() && memcg) | |
494 | __memcg_kmem_commit_charge(page, memcg, order); | |
495 | } | |
496 | ||
d7f25f8a GC |
497 | /** |
498 | * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation | |
499 | * @cachep: the original global kmem cache | |
500 | * @gfp: allocation flags. | |
501 | * | |
5dfb4175 | 502 | * All memory allocated from a per-memcg cache is charged to the owner memcg. |
d7f25f8a GC |
503 | */ |
504 | static __always_inline struct kmem_cache * | |
505 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
506 | { | |
507 | if (!memcg_kmem_enabled()) | |
508 | return cachep; | |
509 | if (gfp & __GFP_NOFAIL) | |
510 | return cachep; | |
511 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
512 | return cachep; | |
513 | if (unlikely(fatal_signal_pending(current))) | |
514 | return cachep; | |
515 | ||
516 | return __memcg_kmem_get_cache(cachep, gfp); | |
517 | } | |
7ae1e1d0 | 518 | #else |
749c5415 GC |
519 | #define for_each_memcg_cache_index(_idx) \ |
520 | for (; NULL; ) | |
521 | ||
b9ce5ef4 GC |
522 | static inline bool memcg_kmem_enabled(void) |
523 | { | |
524 | return false; | |
525 | } | |
526 | ||
7ae1e1d0 GC |
527 | static inline bool |
528 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
529 | { | |
530 | return true; | |
531 | } | |
532 | ||
533 | static inline void memcg_kmem_uncharge_pages(struct page *page, int order) | |
534 | { | |
535 | } | |
536 | ||
537 | static inline void | |
538 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
539 | { | |
540 | } | |
2633d7a0 GC |
541 | |
542 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
543 | { | |
544 | return -1; | |
545 | } | |
546 | ||
d7f25f8a GC |
547 | static inline struct kmem_cache * |
548 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
549 | { | |
550 | return cachep; | |
551 | } | |
7ae1e1d0 | 552 | #endif /* CONFIG_MEMCG_KMEM */ |
8cdea7c0 BS |
553 | #endif /* _LINUX_MEMCONTROL_H */ |
554 |