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8021q: fix a potential memory leak
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CommitLineData
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
27struct mem_cgroup;
28struct page_cgroup;
8697d331
BS
29struct page;
30struct mm_struct;
2633d7a0 31struct 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 */
37enum 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
50struct mem_cgroup_reclaim_cookie {
51 struct zone *zone;
52 int priority;
53 unsigned int generation;
54};
55
c255a458 56#ifdef CONFIG_MEMCG
2c26fdd7
KH
57/*
58 * All "charge" functions with gfp_mask should use GFP_KERNEL or
59 * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
60 * alloc memory but reclaims memory from all available zones. So, "where I want
61 * memory from" bits of gfp_mask has no meaning. So any bits of that field is
62 * available but adding a rule is better. charge functions' gfp_mask should
63 * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
64 * codes.
65 * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
66 */
78fb7466 67
d715ae08 68extern int mem_cgroup_charge_anon(struct page *page, struct mm_struct *mm,
e1a1cd59 69 gfp_t gfp_mask);
7a81b88c 70/* for swap handling */
8c7c6e34 71extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
72835c86 72 struct page *page, gfp_t mask, struct mem_cgroup **memcgp);
7a81b88c 73extern void mem_cgroup_commit_charge_swapin(struct page *page,
72835c86
JW
74 struct mem_cgroup *memcg);
75extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg);
7a81b88c 76
d715ae08 77extern int mem_cgroup_charge_file(struct page *page, struct mm_struct *mm,
8289546e 78 gfp_t gfp_mask);
925b7673
JW
79
80struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
fa9add64 81struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
569b846d
KH
82
83/* For coalescing uncharge for reducing memcg' overhead*/
84extern void mem_cgroup_uncharge_start(void);
85extern void mem_cgroup_uncharge_end(void);
86
3c541e14 87extern void mem_cgroup_uncharge_page(struct page *page);
69029cd5 88extern void mem_cgroup_uncharge_cache_page(struct page *page);
c9b0ed51 89
c3ac9a8a
JW
90bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
91 struct mem_cgroup *memcg);
ffbdccf5
DR
92bool task_in_mem_cgroup(struct task_struct *task,
93 const struct mem_cgroup *memcg);
3062fc67 94
e42d9d5d 95extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
cf475ad2
BS
96extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
97
e1aab161 98extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
182446d0 99extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css);
e1aab161 100
2e4d4091 101static inline
587af308 102bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg)
2e4d4091 103{
587af308
JW
104 struct mem_cgroup *task_memcg;
105 bool match;
c3ac9a8a 106
2e4d4091 107 rcu_read_lock();
587af308
JW
108 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
109 match = __mem_cgroup_same_or_subtree(memcg, task_memcg);
2e4d4091 110 rcu_read_unlock();
c3ac9a8a 111 return match;
2e4d4091 112}
8a9f3ccd 113
c0ff4b85 114extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
d324236b 115
0030f535
JW
116extern void
117mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
118 struct mem_cgroup **memcgp);
c0ff4b85 119extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
50de1dd9 120 struct page *oldpage, struct page *newpage, bool migration_ok);
ae41be37 121
694fbc0f
AM
122struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
123 struct mem_cgroup *,
124 struct mem_cgroup_reclaim_cookie *);
5660048c
JW
125void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
126
58ae83db
KH
127/*
128 * For memory reclaim.
129 */
c56d5c7d 130int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec);
889976db 131int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
4d7dcca2 132unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
fa9add64 133void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
e222432b
BS
134extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
135 struct task_struct *p);
ab936cbc
KH
136extern void mem_cgroup_replace_page_cache(struct page *oldpage,
137 struct page *newpage);
58ae83db 138
49426420 139static inline void mem_cgroup_oom_enable(void)
519e5247 140{
49426420
JW
141 WARN_ON(current->memcg_oom.may_oom);
142 current->memcg_oom.may_oom = 1;
519e5247
JW
143}
144
49426420 145static inline void mem_cgroup_oom_disable(void)
519e5247 146{
49426420
JW
147 WARN_ON(!current->memcg_oom.may_oom);
148 current->memcg_oom.may_oom = 0;
519e5247
JW
149}
150
3812c8c8
JW
151static inline bool task_in_memcg_oom(struct task_struct *p)
152{
49426420 153 return p->memcg_oom.memcg;
3812c8c8
JW
154}
155
49426420 156bool mem_cgroup_oom_synchronize(bool wait);
3812c8c8 157
c255a458 158#ifdef CONFIG_MEMCG_SWAP
c077719b
KH
159extern int do_swap_account;
160#endif
f8d66542
HT
161
162static inline bool mem_cgroup_disabled(void)
163{
073219e9 164 if (memory_cgrp_subsys.disabled)
f8d66542
HT
165 return true;
166 return false;
167}
168
89c06bd5
KH
169void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked,
170 unsigned long *flags);
171
4331f7d3
KH
172extern atomic_t memcg_moving;
173
89c06bd5
KH
174static inline void mem_cgroup_begin_update_page_stat(struct page *page,
175 bool *locked, unsigned long *flags)
176{
177 if (mem_cgroup_disabled())
178 return;
179 rcu_read_lock();
180 *locked = false;
4331f7d3
KH
181 if (atomic_read(&memcg_moving))
182 __mem_cgroup_begin_update_page_stat(page, locked, flags);
89c06bd5
KH
183}
184
185void __mem_cgroup_end_update_page_stat(struct page *page,
186 unsigned long *flags);
187static inline void mem_cgroup_end_update_page_stat(struct page *page,
188 bool *locked, unsigned long *flags)
189{
190 if (mem_cgroup_disabled())
191 return;
192 if (*locked)
193 __mem_cgroup_end_update_page_stat(page, flags);
194 rcu_read_unlock();
195}
196
2a7106f2 197void mem_cgroup_update_page_stat(struct page *page,
68b4876d 198 enum mem_cgroup_stat_index idx,
2a7106f2
GT
199 int val);
200
201static inline void mem_cgroup_inc_page_stat(struct page *page,
68b4876d 202 enum mem_cgroup_stat_index idx)
2a7106f2
GT
203{
204 mem_cgroup_update_page_stat(page, idx, 1);
205}
206
207static inline void mem_cgroup_dec_page_stat(struct page *page,
68b4876d 208 enum mem_cgroup_stat_index idx)
2a7106f2
GT
209{
210 mem_cgroup_update_page_stat(page, idx, -1);
211}
212
0608f43d
AM
213unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
214 gfp_t gfp_mask,
215 unsigned long *total_scanned);
a63d83f4 216
68ae564b
DR
217void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
218static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
219 enum vm_event_item idx)
220{
221 if (mem_cgroup_disabled())
222 return;
223 __mem_cgroup_count_vm_event(mm, idx);
224}
ca3e0214 225#ifdef CONFIG_TRANSPARENT_HUGEPAGE
e94c8a9c 226void mem_cgroup_split_huge_fixup(struct page *head);
ca3e0214
KH
227#endif
228
f212ad7c
DN
229#ifdef CONFIG_DEBUG_VM
230bool mem_cgroup_bad_page_check(struct page *page);
231void mem_cgroup_print_bad_page(struct page *page);
232#endif
c255a458 233#else /* CONFIG_MEMCG */
7a81b88c
KH
234struct mem_cgroup;
235
d715ae08 236static inline int mem_cgroup_charge_anon(struct page *page,
8289546e 237 struct mm_struct *mm, gfp_t gfp_mask)
8a9f3ccd
BS
238{
239 return 0;
240}
241
d715ae08 242static inline int mem_cgroup_charge_file(struct page *page,
8289546e 243 struct mm_struct *mm, gfp_t gfp_mask)
8a9f3ccd 244{
8289546e 245 return 0;
8a9f3ccd
BS
246}
247
8c7c6e34 248static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
72835c86 249 struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp)
7a81b88c
KH
250{
251 return 0;
252}
253
254static inline void mem_cgroup_commit_charge_swapin(struct page *page,
72835c86 255 struct mem_cgroup *memcg)
7a81b88c
KH
256{
257}
258
72835c86 259static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
7a81b88c
KH
260{
261}
262
569b846d
KH
263static inline void mem_cgroup_uncharge_start(void)
264{
265}
266
267static inline void mem_cgroup_uncharge_end(void)
268{
269}
270
8a9f3ccd
BS
271static inline void mem_cgroup_uncharge_page(struct page *page)
272{
273}
274
69029cd5
KH
275static inline void mem_cgroup_uncharge_cache_page(struct page *page)
276{
277}
278
925b7673
JW
279static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
280 struct mem_cgroup *memcg)
08e552c6 281{
925b7673 282 return &zone->lruvec;
08e552c6
KH
283}
284
fa9add64
HD
285static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
286 struct zone *zone)
66e1707b 287{
925b7673 288 return &zone->lruvec;
66e1707b
BS
289}
290
e42d9d5d
WF
291static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
292{
293 return NULL;
294}
295
587af308 296static inline bool mm_match_cgroup(struct mm_struct *mm,
c0ff4b85 297 struct mem_cgroup *memcg)
bed7161a 298{
587af308 299 return true;
bed7161a
BS
300}
301
ffbdccf5
DR
302static inline bool task_in_mem_cgroup(struct task_struct *task,
303 const struct mem_cgroup *memcg)
4c4a2214 304{
ffbdccf5 305 return true;
4c4a2214
DR
306}
307
c0ff4b85
R
308static inline struct cgroup_subsys_state
309 *mem_cgroup_css(struct mem_cgroup *memcg)
d324236b
WF
310{
311 return NULL;
312}
313
0030f535 314static inline void
ac39cf8c 315mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
0030f535 316 struct mem_cgroup **memcgp)
ae41be37 317{
ae41be37
KH
318}
319
c0ff4b85 320static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
50de1dd9 321 struct page *oldpage, struct page *newpage, bool migration_ok)
ae41be37
KH
322{
323}
324
5660048c
JW
325static inline struct mem_cgroup *
326mem_cgroup_iter(struct mem_cgroup *root,
327 struct mem_cgroup *prev,
328 struct mem_cgroup_reclaim_cookie *reclaim)
329{
330 return NULL;
331}
332
333static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
334 struct mem_cgroup *prev)
335{
336}
337
f8d66542
HT
338static inline bool mem_cgroup_disabled(void)
339{
340 return true;
341}
a636b327 342
14797e23 343static inline int
c56d5c7d 344mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
14797e23
KM
345{
346 return 1;
347}
348
a3d8e054 349static inline unsigned long
4d7dcca2 350mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
a3d8e054
KM
351{
352 return 0;
353}
354
fa9add64
HD
355static inline void
356mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
357 int increment)
3e2f41f1 358{
3e2f41f1
KM
359}
360
e222432b
BS
361static inline void
362mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
363{
364}
365
89c06bd5
KH
366static inline void mem_cgroup_begin_update_page_stat(struct page *page,
367 bool *locked, unsigned long *flags)
368{
369}
370
371static inline void mem_cgroup_end_update_page_stat(struct page *page,
372 bool *locked, unsigned long *flags)
373{
374}
375
49426420 376static inline void mem_cgroup_oom_enable(void)
519e5247
JW
377{
378}
379
49426420 380static inline void mem_cgroup_oom_disable(void)
519e5247
JW
381{
382}
383
3812c8c8
JW
384static inline bool task_in_memcg_oom(struct task_struct *p)
385{
386 return false;
387}
388
49426420 389static inline bool mem_cgroup_oom_synchronize(bool wait)
3812c8c8
JW
390{
391 return false;
392}
393
2a7106f2 394static inline void mem_cgroup_inc_page_stat(struct page *page,
68b4876d 395 enum mem_cgroup_stat_index idx)
2a7106f2
GT
396{
397}
398
399static inline void mem_cgroup_dec_page_stat(struct page *page,
68b4876d 400 enum mem_cgroup_stat_index idx)
d69b042f
BS
401{
402}
403
4e416953 404static inline
0608f43d
AM
405unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
406 gfp_t gfp_mask,
407 unsigned long *total_scanned)
4e416953 408{
0608f43d 409 return 0;
4e416953
BS
410}
411
e94c8a9c 412static inline void mem_cgroup_split_huge_fixup(struct page *head)
ca3e0214
KH
413{
414}
415
456f998e
YH
416static inline
417void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
418{
419}
ab936cbc
KH
420static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
421 struct page *newpage)
422{
423}
c255a458 424#endif /* CONFIG_MEMCG */
78fb7466 425
c255a458 426#if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM)
f212ad7c
DN
427static inline bool
428mem_cgroup_bad_page_check(struct page *page)
429{
430 return false;
431}
432
433static inline void
434mem_cgroup_print_bad_page(struct page *page)
435{
436}
437#endif
438
e1aab161
GC
439enum {
440 UNDER_LIMIT,
441 SOFT_LIMIT,
442 OVER_LIMIT,
443};
444
445struct sock;
cd59085a 446#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
e1aab161
GC
447void sock_update_memcg(struct sock *sk);
448void sock_release_memcg(struct sock *sk);
449#else
450static inline void sock_update_memcg(struct sock *sk)
451{
452}
453static inline void sock_release_memcg(struct sock *sk)
454{
455}
cd59085a 456#endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */
7ae1e1d0
GC
457
458#ifdef CONFIG_MEMCG_KMEM
a8964b9b 459extern struct static_key memcg_kmem_enabled_key;
749c5415
GC
460
461extern int memcg_limited_groups_array_size;
ebe945c2
GC
462
463/*
464 * Helper macro to loop through all memcg-specific caches. Callers must still
465 * check if the cache is valid (it is either valid or NULL).
466 * the slab_mutex must be held when looping through those caches
467 */
749c5415 468#define for_each_memcg_cache_index(_idx) \
91c777d8 469 for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++)
749c5415 470
7ae1e1d0
GC
471static inline bool memcg_kmem_enabled(void)
472{
a8964b9b 473 return static_key_false(&memcg_kmem_enabled_key);
7ae1e1d0
GC
474}
475
476/*
477 * In general, we'll do everything in our power to not incur in any overhead
478 * for non-memcg users for the kmem functions. Not even a function call, if we
479 * can avoid it.
480 *
481 * Therefore, we'll inline all those functions so that in the best case, we'll
482 * see that kmemcg is off for everybody and proceed quickly. If it is on,
483 * we'll still do most of the flag checking inline. We check a lot of
484 * conditions, but because they are pretty simple, they are expected to be
485 * fast.
486 */
487bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
488 int order);
489void __memcg_kmem_commit_charge(struct page *page,
490 struct mem_cgroup *memcg, int order);
491void __memcg_kmem_uncharge_pages(struct page *page, int order);
492
2633d7a0 493int memcg_cache_id(struct mem_cgroup *memcg);
5722d094 494
363a044f
VD
495int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
496 struct kmem_cache *root_cache);
497void memcg_free_cache_params(struct kmem_cache *s);
2633d7a0 498
55007d84
GC
499int memcg_update_cache_size(struct kmem_cache *s, int num_groups);
500void memcg_update_array_size(int num_groups);
d7f25f8a
GC
501
502struct kmem_cache *
503__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);
504
c67a8a68
VD
505int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order);
506void __memcg_uncharge_slab(struct kmem_cache *cachep, int order);
5dfb4175 507
776ed0f0 508int __memcg_cleanup_cache_params(struct kmem_cache *s);
1f458cbf 509
7ae1e1d0
GC
510/**
511 * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
512 * @gfp: the gfp allocation flags.
513 * @memcg: a pointer to the memcg this was charged against.
514 * @order: allocation order.
515 *
516 * returns true if the memcg where the current task belongs can hold this
517 * allocation.
518 *
519 * We return true automatically if this allocation is not to be accounted to
520 * any memcg.
521 */
522static inline bool
523memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
524{
525 if (!memcg_kmem_enabled())
526 return true;
527
528 /*
529 * __GFP_NOFAIL allocations will move on even if charging is not
530 * possible. Therefore we don't even try, and have this allocation
531 * unaccounted. We could in theory charge it with
532 * res_counter_charge_nofail, but we hope those allocations are rare,
533 * and won't be worth the trouble.
534 */
52383431 535 if (gfp & __GFP_NOFAIL)
7ae1e1d0
GC
536 return true;
537 if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
538 return true;
539
540 /* If the test is dying, just let it go. */
541 if (unlikely(fatal_signal_pending(current)))
542 return true;
543
544 return __memcg_kmem_newpage_charge(gfp, memcg, order);
545}
546
547/**
548 * memcg_kmem_uncharge_pages: uncharge pages from memcg
549 * @page: pointer to struct page being freed
550 * @order: allocation order.
551 *
552 * there is no need to specify memcg here, since it is embedded in page_cgroup
553 */
554static inline void
555memcg_kmem_uncharge_pages(struct page *page, int order)
556{
557 if (memcg_kmem_enabled())
558 __memcg_kmem_uncharge_pages(page, order);
559}
560
561/**
562 * memcg_kmem_commit_charge: embeds correct memcg in a page
563 * @page: pointer to struct page recently allocated
564 * @memcg: the memcg structure we charged against
565 * @order: allocation order.
566 *
567 * Needs to be called after memcg_kmem_newpage_charge, regardless of success or
568 * failure of the allocation. if @page is NULL, this function will revert the
569 * charges. Otherwise, it will commit the memcg given by @memcg to the
570 * corresponding page_cgroup.
571 */
572static inline void
573memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
574{
575 if (memcg_kmem_enabled() && memcg)
576 __memcg_kmem_commit_charge(page, memcg, order);
577}
578
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579/**
580 * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation
581 * @cachep: the original global kmem cache
582 * @gfp: allocation flags.
583 *
5dfb4175 584 * All memory allocated from a per-memcg cache is charged to the owner memcg.
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585 */
586static __always_inline struct kmem_cache *
587memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
588{
589 if (!memcg_kmem_enabled())
590 return cachep;
591 if (gfp & __GFP_NOFAIL)
592 return cachep;
593 if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
594 return cachep;
595 if (unlikely(fatal_signal_pending(current)))
596 return cachep;
597
598 return __memcg_kmem_get_cache(cachep, gfp);
599}
7ae1e1d0 600#else
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601#define for_each_memcg_cache_index(_idx) \
602 for (; NULL; )
603
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604static inline bool memcg_kmem_enabled(void)
605{
606 return false;
607}
608
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609static inline bool
610memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
611{
612 return true;
613}
614
615static inline void memcg_kmem_uncharge_pages(struct page *page, int order)
616{
617}
618
619static inline void
620memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
621{
622}
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623
624static inline int memcg_cache_id(struct mem_cgroup *memcg)
625{
626 return -1;
627}
628
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629static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg,
630 struct kmem_cache *s, struct kmem_cache *root_cache)
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631{
632 return 0;
633}
634
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635static inline void memcg_free_cache_params(struct kmem_cache *s)
636{
637}
638
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639static inline struct kmem_cache *
640memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
641{
642 return cachep;
643}
7ae1e1d0 644#endif /* CONFIG_MEMCG_KMEM */
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645#endif /* _LINUX_MEMCONTROL_H */
646