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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 | 118 | int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec); |
889976db | 119 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); |
4d7dcca2 | 120 | unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list); |
fa9add64 | 121 | void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int); |
e222432b BS |
122 | extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, |
123 | struct task_struct *p); | |
ab936cbc KH |
124 | extern void mem_cgroup_replace_page_cache(struct page *oldpage, |
125 | struct page *newpage); | |
58ae83db | 126 | |
c255a458 | 127 | #ifdef CONFIG_MEMCG_SWAP |
c077719b KH |
128 | extern int do_swap_account; |
129 | #endif | |
f8d66542 HT |
130 | |
131 | static inline bool mem_cgroup_disabled(void) | |
132 | { | |
133 | if (mem_cgroup_subsys.disabled) | |
134 | return true; | |
135 | return false; | |
136 | } | |
137 | ||
89c06bd5 KH |
138 | void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked, |
139 | unsigned long *flags); | |
140 | ||
4331f7d3 KH |
141 | extern atomic_t memcg_moving; |
142 | ||
89c06bd5 KH |
143 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, |
144 | bool *locked, unsigned long *flags) | |
145 | { | |
146 | if (mem_cgroup_disabled()) | |
147 | return; | |
148 | rcu_read_lock(); | |
149 | *locked = false; | |
4331f7d3 KH |
150 | if (atomic_read(&memcg_moving)) |
151 | __mem_cgroup_begin_update_page_stat(page, locked, flags); | |
89c06bd5 KH |
152 | } |
153 | ||
154 | void __mem_cgroup_end_update_page_stat(struct page *page, | |
155 | unsigned long *flags); | |
156 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
157 | bool *locked, unsigned long *flags) | |
158 | { | |
159 | if (mem_cgroup_disabled()) | |
160 | return; | |
161 | if (*locked) | |
162 | __mem_cgroup_end_update_page_stat(page, flags); | |
163 | rcu_read_unlock(); | |
164 | } | |
165 | ||
2a7106f2 GT |
166 | void mem_cgroup_update_page_stat(struct page *page, |
167 | enum mem_cgroup_page_stat_item idx, | |
168 | int val); | |
169 | ||
170 | static inline void mem_cgroup_inc_page_stat(struct page *page, | |
171 | enum mem_cgroup_page_stat_item idx) | |
172 | { | |
173 | mem_cgroup_update_page_stat(page, idx, 1); | |
174 | } | |
175 | ||
176 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
177 | enum mem_cgroup_page_stat_item idx) | |
178 | { | |
179 | mem_cgroup_update_page_stat(page, idx, -1); | |
180 | } | |
181 | ||
4e416953 | 182 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
0ae5e89c YH |
183 | gfp_t gfp_mask, |
184 | unsigned long *total_scanned); | |
a63d83f4 | 185 | |
68ae564b DR |
186 | void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); |
187 | static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, | |
188 | enum vm_event_item idx) | |
189 | { | |
190 | if (mem_cgroup_disabled()) | |
191 | return; | |
192 | __mem_cgroup_count_vm_event(mm, idx); | |
193 | } | |
ca3e0214 | 194 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e94c8a9c | 195 | void mem_cgroup_split_huge_fixup(struct page *head); |
ca3e0214 KH |
196 | #endif |
197 | ||
f212ad7c DN |
198 | #ifdef CONFIG_DEBUG_VM |
199 | bool mem_cgroup_bad_page_check(struct page *page); | |
200 | void mem_cgroup_print_bad_page(struct page *page); | |
201 | #endif | |
c255a458 | 202 | #else /* CONFIG_MEMCG */ |
7a81b88c KH |
203 | struct mem_cgroup; |
204 | ||
205 | static inline int mem_cgroup_newpage_charge(struct page *page, | |
8289546e | 206 | struct mm_struct *mm, gfp_t gfp_mask) |
8a9f3ccd BS |
207 | { |
208 | return 0; | |
209 | } | |
210 | ||
8289546e HD |
211 | static inline int mem_cgroup_cache_charge(struct page *page, |
212 | struct mm_struct *mm, gfp_t gfp_mask) | |
8a9f3ccd | 213 | { |
8289546e | 214 | return 0; |
8a9f3ccd BS |
215 | } |
216 | ||
8c7c6e34 | 217 | static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
72835c86 | 218 | struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp) |
7a81b88c KH |
219 | { |
220 | return 0; | |
221 | } | |
222 | ||
223 | static inline void mem_cgroup_commit_charge_swapin(struct page *page, | |
72835c86 | 224 | struct mem_cgroup *memcg) |
7a81b88c KH |
225 | { |
226 | } | |
227 | ||
72835c86 | 228 | static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg) |
7a81b88c KH |
229 | { |
230 | } | |
231 | ||
569b846d KH |
232 | static inline void mem_cgroup_uncharge_start(void) |
233 | { | |
234 | } | |
235 | ||
236 | static inline void mem_cgroup_uncharge_end(void) | |
237 | { | |
238 | } | |
239 | ||
8a9f3ccd BS |
240 | static inline void mem_cgroup_uncharge_page(struct page *page) |
241 | { | |
242 | } | |
243 | ||
69029cd5 KH |
244 | static inline void mem_cgroup_uncharge_cache_page(struct page *page) |
245 | { | |
246 | } | |
247 | ||
925b7673 JW |
248 | static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, |
249 | struct mem_cgroup *memcg) | |
08e552c6 | 250 | { |
925b7673 | 251 | return &zone->lruvec; |
08e552c6 KH |
252 | } |
253 | ||
fa9add64 HD |
254 | static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, |
255 | struct zone *zone) | |
66e1707b | 256 | { |
925b7673 | 257 | return &zone->lruvec; |
66e1707b BS |
258 | } |
259 | ||
e42d9d5d WF |
260 | static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) |
261 | { | |
262 | return NULL; | |
263 | } | |
264 | ||
a433658c KM |
265 | static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) |
266 | { | |
267 | return NULL; | |
268 | } | |
269 | ||
587af308 | 270 | static inline bool mm_match_cgroup(struct mm_struct *mm, |
c0ff4b85 | 271 | struct mem_cgroup *memcg) |
bed7161a | 272 | { |
587af308 | 273 | return true; |
bed7161a BS |
274 | } |
275 | ||
4c4a2214 | 276 | static inline int task_in_mem_cgroup(struct task_struct *task, |
c0ff4b85 | 277 | const struct mem_cgroup *memcg) |
4c4a2214 DR |
278 | { |
279 | return 1; | |
280 | } | |
281 | ||
c0ff4b85 R |
282 | static inline struct cgroup_subsys_state |
283 | *mem_cgroup_css(struct mem_cgroup *memcg) | |
d324236b WF |
284 | { |
285 | return NULL; | |
286 | } | |
287 | ||
0030f535 | 288 | static inline void |
ac39cf8c | 289 | mem_cgroup_prepare_migration(struct page *page, struct page *newpage, |
0030f535 | 290 | struct mem_cgroup **memcgp) |
ae41be37 | 291 | { |
ae41be37 KH |
292 | } |
293 | ||
c0ff4b85 | 294 | static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg, |
50de1dd9 | 295 | struct page *oldpage, struct page *newpage, bool migration_ok) |
ae41be37 KH |
296 | { |
297 | } | |
298 | ||
5660048c JW |
299 | static inline struct mem_cgroup * |
300 | mem_cgroup_iter(struct mem_cgroup *root, | |
301 | struct mem_cgroup *prev, | |
302 | struct mem_cgroup_reclaim_cookie *reclaim) | |
303 | { | |
304 | return NULL; | |
305 | } | |
306 | ||
307 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | |
308 | struct mem_cgroup *prev) | |
309 | { | |
310 | } | |
311 | ||
f8d66542 HT |
312 | static inline bool mem_cgroup_disabled(void) |
313 | { | |
314 | return true; | |
315 | } | |
a636b327 | 316 | |
14797e23 | 317 | static inline int |
c56d5c7d | 318 | mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) |
14797e23 KM |
319 | { |
320 | return 1; | |
321 | } | |
322 | ||
a3d8e054 | 323 | static inline unsigned long |
4d7dcca2 | 324 | mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) |
a3d8e054 KM |
325 | { |
326 | return 0; | |
327 | } | |
328 | ||
fa9add64 HD |
329 | static inline void |
330 | mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | |
331 | int increment) | |
3e2f41f1 | 332 | { |
3e2f41f1 KM |
333 | } |
334 | ||
e222432b BS |
335 | static inline void |
336 | mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) | |
337 | { | |
338 | } | |
339 | ||
89c06bd5 KH |
340 | static inline void mem_cgroup_begin_update_page_stat(struct page *page, |
341 | bool *locked, unsigned long *flags) | |
342 | { | |
343 | } | |
344 | ||
345 | static inline void mem_cgroup_end_update_page_stat(struct page *page, | |
346 | bool *locked, unsigned long *flags) | |
347 | { | |
348 | } | |
349 | ||
2a7106f2 GT |
350 | static inline void mem_cgroup_inc_page_stat(struct page *page, |
351 | enum mem_cgroup_page_stat_item idx) | |
352 | { | |
353 | } | |
354 | ||
355 | static inline void mem_cgroup_dec_page_stat(struct page *page, | |
356 | enum mem_cgroup_page_stat_item idx) | |
d69b042f BS |
357 | { |
358 | } | |
359 | ||
4e416953 BS |
360 | static inline |
361 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, | |
0ae5e89c YH |
362 | gfp_t gfp_mask, |
363 | unsigned long *total_scanned) | |
4e416953 BS |
364 | { |
365 | return 0; | |
366 | } | |
367 | ||
e94c8a9c | 368 | static inline void mem_cgroup_split_huge_fixup(struct page *head) |
ca3e0214 KH |
369 | { |
370 | } | |
371 | ||
456f998e YH |
372 | static inline |
373 | void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) | |
374 | { | |
375 | } | |
ab936cbc KH |
376 | static inline void mem_cgroup_replace_page_cache(struct page *oldpage, |
377 | struct page *newpage) | |
378 | { | |
379 | } | |
c255a458 | 380 | #endif /* CONFIG_MEMCG */ |
78fb7466 | 381 | |
c255a458 | 382 | #if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM) |
f212ad7c DN |
383 | static inline bool |
384 | mem_cgroup_bad_page_check(struct page *page) | |
385 | { | |
386 | return false; | |
387 | } | |
388 | ||
389 | static inline void | |
390 | mem_cgroup_print_bad_page(struct page *page) | |
391 | { | |
392 | } | |
393 | #endif | |
394 | ||
e1aab161 GC |
395 | enum { |
396 | UNDER_LIMIT, | |
397 | SOFT_LIMIT, | |
398 | OVER_LIMIT, | |
399 | }; | |
400 | ||
401 | struct sock; | |
cd59085a | 402 | #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM) |
e1aab161 GC |
403 | void sock_update_memcg(struct sock *sk); |
404 | void sock_release_memcg(struct sock *sk); | |
405 | #else | |
406 | static inline void sock_update_memcg(struct sock *sk) | |
407 | { | |
408 | } | |
409 | static inline void sock_release_memcg(struct sock *sk) | |
410 | { | |
411 | } | |
cd59085a | 412 | #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */ |
7ae1e1d0 GC |
413 | |
414 | #ifdef CONFIG_MEMCG_KMEM | |
a8964b9b | 415 | extern struct static_key memcg_kmem_enabled_key; |
749c5415 GC |
416 | |
417 | extern int memcg_limited_groups_array_size; | |
ebe945c2 GC |
418 | |
419 | /* | |
420 | * Helper macro to loop through all memcg-specific caches. Callers must still | |
421 | * check if the cache is valid (it is either valid or NULL). | |
422 | * the slab_mutex must be held when looping through those caches | |
423 | */ | |
749c5415 | 424 | #define for_each_memcg_cache_index(_idx) \ |
91c777d8 | 425 | for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++) |
749c5415 | 426 | |
7ae1e1d0 GC |
427 | static inline bool memcg_kmem_enabled(void) |
428 | { | |
a8964b9b | 429 | return static_key_false(&memcg_kmem_enabled_key); |
7ae1e1d0 GC |
430 | } |
431 | ||
432 | /* | |
433 | * In general, we'll do everything in our power to not incur in any overhead | |
434 | * for non-memcg users for the kmem functions. Not even a function call, if we | |
435 | * can avoid it. | |
436 | * | |
437 | * Therefore, we'll inline all those functions so that in the best case, we'll | |
438 | * see that kmemcg is off for everybody and proceed quickly. If it is on, | |
439 | * we'll still do most of the flag checking inline. We check a lot of | |
440 | * conditions, but because they are pretty simple, they are expected to be | |
441 | * fast. | |
442 | */ | |
443 | bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, | |
444 | int order); | |
445 | void __memcg_kmem_commit_charge(struct page *page, | |
446 | struct mem_cgroup *memcg, int order); | |
447 | void __memcg_kmem_uncharge_pages(struct page *page, int order); | |
448 | ||
2633d7a0 | 449 | int memcg_cache_id(struct mem_cgroup *memcg); |
943a451a GC |
450 | int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s, |
451 | struct kmem_cache *root_cache); | |
2633d7a0 GC |
452 | void memcg_release_cache(struct kmem_cache *cachep); |
453 | void memcg_cache_list_add(struct mem_cgroup *memcg, struct kmem_cache *cachep); | |
454 | ||
55007d84 GC |
455 | int memcg_update_cache_size(struct kmem_cache *s, int num_groups); |
456 | void memcg_update_array_size(int num_groups); | |
d7f25f8a GC |
457 | |
458 | struct kmem_cache * | |
459 | __memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp); | |
460 | ||
1f458cbf | 461 | void mem_cgroup_destroy_cache(struct kmem_cache *cachep); |
7cf27982 | 462 | void kmem_cache_destroy_memcg_children(struct kmem_cache *s); |
1f458cbf | 463 | |
7ae1e1d0 GC |
464 | /** |
465 | * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed. | |
466 | * @gfp: the gfp allocation flags. | |
467 | * @memcg: a pointer to the memcg this was charged against. | |
468 | * @order: allocation order. | |
469 | * | |
470 | * returns true if the memcg where the current task belongs can hold this | |
471 | * allocation. | |
472 | * | |
473 | * We return true automatically if this allocation is not to be accounted to | |
474 | * any memcg. | |
475 | */ | |
476 | static inline bool | |
477 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
478 | { | |
479 | if (!memcg_kmem_enabled()) | |
480 | return true; | |
481 | ||
482 | /* | |
483 | * __GFP_NOFAIL allocations will move on even if charging is not | |
484 | * possible. Therefore we don't even try, and have this allocation | |
485 | * unaccounted. We could in theory charge it with | |
486 | * res_counter_charge_nofail, but we hope those allocations are rare, | |
487 | * and won't be worth the trouble. | |
488 | */ | |
489 | if (!(gfp & __GFP_KMEMCG) || (gfp & __GFP_NOFAIL)) | |
490 | return true; | |
491 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
492 | return true; | |
493 | ||
494 | /* If the test is dying, just let it go. */ | |
495 | if (unlikely(fatal_signal_pending(current))) | |
496 | return true; | |
497 | ||
498 | return __memcg_kmem_newpage_charge(gfp, memcg, order); | |
499 | } | |
500 | ||
501 | /** | |
502 | * memcg_kmem_uncharge_pages: uncharge pages from memcg | |
503 | * @page: pointer to struct page being freed | |
504 | * @order: allocation order. | |
505 | * | |
506 | * there is no need to specify memcg here, since it is embedded in page_cgroup | |
507 | */ | |
508 | static inline void | |
509 | memcg_kmem_uncharge_pages(struct page *page, int order) | |
510 | { | |
511 | if (memcg_kmem_enabled()) | |
512 | __memcg_kmem_uncharge_pages(page, order); | |
513 | } | |
514 | ||
515 | /** | |
516 | * memcg_kmem_commit_charge: embeds correct memcg in a page | |
517 | * @page: pointer to struct page recently allocated | |
518 | * @memcg: the memcg structure we charged against | |
519 | * @order: allocation order. | |
520 | * | |
521 | * Needs to be called after memcg_kmem_newpage_charge, regardless of success or | |
522 | * failure of the allocation. if @page is NULL, this function will revert the | |
523 | * charges. Otherwise, it will commit the memcg given by @memcg to the | |
524 | * corresponding page_cgroup. | |
525 | */ | |
526 | static inline void | |
527 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
528 | { | |
529 | if (memcg_kmem_enabled() && memcg) | |
530 | __memcg_kmem_commit_charge(page, memcg, order); | |
531 | } | |
532 | ||
d7f25f8a GC |
533 | /** |
534 | * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation | |
535 | * @cachep: the original global kmem cache | |
536 | * @gfp: allocation flags. | |
537 | * | |
538 | * This function assumes that the task allocating, which determines the memcg | |
539 | * in the page allocator, belongs to the same cgroup throughout the whole | |
540 | * process. Misacounting can happen if the task calls memcg_kmem_get_cache() | |
541 | * while belonging to a cgroup, and later on changes. This is considered | |
542 | * acceptable, and should only happen upon task migration. | |
543 | * | |
544 | * Before the cache is created by the memcg core, there is also a possible | |
545 | * imbalance: the task belongs to a memcg, but the cache being allocated from | |
546 | * is the global cache, since the child cache is not yet guaranteed to be | |
547 | * ready. This case is also fine, since in this case the GFP_KMEMCG will not be | |
548 | * passed and the page allocator will not attempt any cgroup accounting. | |
549 | */ | |
550 | static __always_inline struct kmem_cache * | |
551 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
552 | { | |
553 | if (!memcg_kmem_enabled()) | |
554 | return cachep; | |
555 | if (gfp & __GFP_NOFAIL) | |
556 | return cachep; | |
557 | if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) | |
558 | return cachep; | |
559 | if (unlikely(fatal_signal_pending(current))) | |
560 | return cachep; | |
561 | ||
562 | return __memcg_kmem_get_cache(cachep, gfp); | |
563 | } | |
7ae1e1d0 | 564 | #else |
749c5415 GC |
565 | #define for_each_memcg_cache_index(_idx) \ |
566 | for (; NULL; ) | |
567 | ||
b9ce5ef4 GC |
568 | static inline bool memcg_kmem_enabled(void) |
569 | { | |
570 | return false; | |
571 | } | |
572 | ||
7ae1e1d0 GC |
573 | static inline bool |
574 | memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) | |
575 | { | |
576 | return true; | |
577 | } | |
578 | ||
579 | static inline void memcg_kmem_uncharge_pages(struct page *page, int order) | |
580 | { | |
581 | } | |
582 | ||
583 | static inline void | |
584 | memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) | |
585 | { | |
586 | } | |
2633d7a0 GC |
587 | |
588 | static inline int memcg_cache_id(struct mem_cgroup *memcg) | |
589 | { | |
590 | return -1; | |
591 | } | |
592 | ||
943a451a GC |
593 | static inline int |
594 | memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s, | |
595 | struct kmem_cache *root_cache) | |
2633d7a0 GC |
596 | { |
597 | return 0; | |
598 | } | |
599 | ||
600 | static inline void memcg_release_cache(struct kmem_cache *cachep) | |
601 | { | |
602 | } | |
603 | ||
604 | static inline void memcg_cache_list_add(struct mem_cgroup *memcg, | |
605 | struct kmem_cache *s) | |
606 | { | |
607 | } | |
d7f25f8a GC |
608 | |
609 | static inline struct kmem_cache * | |
610 | memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) | |
611 | { | |
612 | return cachep; | |
613 | } | |
7cf27982 GC |
614 | |
615 | static inline void kmem_cache_destroy_memcg_children(struct kmem_cache *s) | |
616 | { | |
617 | } | |
7ae1e1d0 | 618 | #endif /* CONFIG_MEMCG_KMEM */ |
8cdea7c0 BS |
619 | #endif /* _LINUX_MEMCONTROL_H */ |
620 |