1 /* memcontrol.h - Memory Controller
3 * Copyright IBM Corporation, 2007
4 * Author Balbir Singh <balbir@linux.vnet.ibm.com>
6 * Copyright 2007 OpenVZ SWsoft Inc
7 * Author: Pavel Emelianov <xemul@openvz.org>
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.
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.
20 #ifndef _LINUX_MEMCONTROL_H
21 #define _LINUX_MEMCONTROL_H
22 #include <linux/cgroup.h>
23 #include <linux/vm_event_item.h>
24 #include <linux/hardirq.h>
25 #include <linux/jump_label.h>
26 #include <linux/page_counter.h>
27 #include <linux/vmpressure.h>
28 #include <linux/eventfd.h>
29 #include <linux/mmzone.h>
30 #include <linux/writeback.h>
31 #include <linux/page-flags.h>
39 * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c,
40 * These two lists should keep in accord with each other.
42 enum mem_cgroup_stat_index
{
44 * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
46 MEM_CGROUP_STAT_CACHE
, /* # of pages charged as cache */
47 MEM_CGROUP_STAT_RSS
, /* # of pages charged as anon rss */
48 MEM_CGROUP_STAT_RSS_HUGE
, /* # of pages charged as anon huge */
49 MEM_CGROUP_STAT_FILE_MAPPED
, /* # of pages charged as file rss */
50 MEM_CGROUP_STAT_DIRTY
, /* # of dirty pages in page cache */
51 MEM_CGROUP_STAT_WRITEBACK
, /* # of pages under writeback */
52 MEM_CGROUP_STAT_SWAP
, /* # of pages, swapped out */
53 MEM_CGROUP_STAT_NSTATS
,
54 /* default hierarchy stats */
55 MEMCG_KERNEL_STACK_KB
= MEM_CGROUP_STAT_NSTATS
,
56 MEMCG_SLAB_RECLAIMABLE
,
57 MEMCG_SLAB_UNRECLAIMABLE
,
62 struct mem_cgroup_reclaim_cookie
{
65 unsigned int generation
;
68 enum mem_cgroup_events_index
{
69 MEM_CGROUP_EVENTS_PGPGIN
, /* # of pages paged in */
70 MEM_CGROUP_EVENTS_PGPGOUT
, /* # of pages paged out */
71 MEM_CGROUP_EVENTS_PGFAULT
, /* # of page-faults */
72 MEM_CGROUP_EVENTS_PGMAJFAULT
, /* # of major page-faults */
73 MEM_CGROUP_EVENTS_NSTATS
,
74 /* default hierarchy events */
75 MEMCG_LOW
= MEM_CGROUP_EVENTS_NSTATS
,
83 * Per memcg event counter is incremented at every pagein/pageout. With THP,
84 * it will be incremated by the number of pages. This counter is used for
85 * for trigger some periodic events. This is straightforward and better
86 * than using jiffies etc. to handle periodic memcg event.
88 enum mem_cgroup_events_target
{
89 MEM_CGROUP_TARGET_THRESH
,
90 MEM_CGROUP_TARGET_SOFTLIMIT
,
91 MEM_CGROUP_TARGET_NUMAINFO
,
97 #define MEM_CGROUP_ID_SHIFT 16
98 #define MEM_CGROUP_ID_MAX USHRT_MAX
100 struct mem_cgroup_id
{
105 struct mem_cgroup_stat_cpu
{
106 long count
[MEMCG_NR_STAT
];
107 unsigned long events
[MEMCG_NR_EVENTS
];
108 unsigned long nr_page_events
;
109 unsigned long targets
[MEM_CGROUP_NTARGETS
];
112 struct mem_cgroup_reclaim_iter
{
113 struct mem_cgroup
*position
;
114 /* scan generation, increased every round-trip */
115 unsigned int generation
;
119 * per-zone information in memory controller.
121 struct mem_cgroup_per_node
{
122 struct lruvec lruvec
;
123 unsigned long lru_zone_size
[MAX_NR_ZONES
][NR_LRU_LISTS
];
125 struct mem_cgroup_reclaim_iter iter
[DEF_PRIORITY
+ 1];
127 struct rb_node tree_node
; /* RB tree node */
128 unsigned long usage_in_excess
;/* Set to the value by which */
129 /* the soft limit is exceeded*/
131 struct mem_cgroup
*memcg
; /* Back pointer, we cannot */
132 /* use container_of */
135 struct mem_cgroup_threshold
{
136 struct eventfd_ctx
*eventfd
;
137 unsigned long threshold
;
141 struct mem_cgroup_threshold_ary
{
142 /* An array index points to threshold just below or equal to usage. */
143 int current_threshold
;
144 /* Size of entries[] */
146 /* Array of thresholds */
147 struct mem_cgroup_threshold entries
[0];
150 struct mem_cgroup_thresholds
{
151 /* Primary thresholds array */
152 struct mem_cgroup_threshold_ary
*primary
;
154 * Spare threshold array.
155 * This is needed to make mem_cgroup_unregister_event() "never fail".
156 * It must be able to store at least primary->size - 1 entries.
158 struct mem_cgroup_threshold_ary
*spare
;
161 enum memcg_kmem_state
{
168 * The memory controller data structure. The memory controller controls both
169 * page cache and RSS per cgroup. We would eventually like to provide
170 * statistics based on the statistics developed by Rik Van Riel for clock-pro,
171 * to help the administrator determine what knobs to tune.
174 struct cgroup_subsys_state css
;
176 /* Private memcg ID. Used to ID objects that outlive the cgroup */
177 struct mem_cgroup_id id
;
179 /* Accounted resources */
180 struct page_counter memory
;
181 struct page_counter swap
;
183 /* Legacy consumer-oriented counters */
184 struct page_counter memsw
;
185 struct page_counter kmem
;
186 struct page_counter tcpmem
;
188 /* Normal memory consumption range */
192 /* Range enforcement for interrupt charges */
193 struct work_struct high_work
;
195 unsigned long soft_limit
;
197 /* vmpressure notifications */
198 struct vmpressure vmpressure
;
201 * Should the accounting and control be hierarchical, per subtree?
205 /* protected by memcg_oom_lock */
210 /* OOM-Killer disable */
211 int oom_kill_disable
;
213 /* handle for "memory.events" */
214 struct cgroup_file events_file
;
216 /* protect arrays of thresholds */
217 struct mutex thresholds_lock
;
219 /* thresholds for memory usage. RCU-protected */
220 struct mem_cgroup_thresholds thresholds
;
222 /* thresholds for mem+swap usage. RCU-protected */
223 struct mem_cgroup_thresholds memsw_thresholds
;
225 /* For oom notifier event fd */
226 struct list_head oom_notify
;
229 * Should we move charges of a task when a task is moved into this
230 * mem_cgroup ? And what type of charges should we move ?
232 unsigned long move_charge_at_immigrate
;
234 * set > 0 if pages under this cgroup are moving to other cgroup.
236 atomic_t moving_account
;
237 /* taken only while moving_account > 0 */
238 spinlock_t move_lock
;
239 struct task_struct
*move_lock_task
;
240 unsigned long move_lock_flags
;
244 struct mem_cgroup_stat_cpu __percpu
*stat
;
246 unsigned long socket_pressure
;
248 /* Legacy tcp memory accounting */
253 /* Index in the kmem_cache->memcg_params.memcg_caches array */
255 enum memcg_kmem_state kmem_state
;
256 struct list_head kmem_caches
;
259 int last_scanned_node
;
261 nodemask_t scan_nodes
;
262 atomic_t numainfo_events
;
263 atomic_t numainfo_updating
;
266 #ifdef CONFIG_CGROUP_WRITEBACK
267 struct list_head cgwb_list
;
268 struct wb_domain cgwb_domain
;
271 /* List of events which userspace want to receive */
272 struct list_head event_list
;
273 spinlock_t event_list_lock
;
275 struct mem_cgroup_per_node
*nodeinfo
[0];
276 /* WARNING: nodeinfo must be the last member here */
279 extern struct mem_cgroup
*root_mem_cgroup
;
281 static inline bool mem_cgroup_disabled(void)
283 return !cgroup_subsys_enabled(memory_cgrp_subsys
);
287 * mem_cgroup_events - count memory events against a cgroup
288 * @memcg: the memory cgroup
289 * @idx: the event index
290 * @nr: the number of events to account for
292 static inline void mem_cgroup_events(struct mem_cgroup
*memcg
,
293 enum mem_cgroup_events_index idx
,
296 this_cpu_add(memcg
->stat
->events
[idx
], nr
);
297 cgroup_file_notify(&memcg
->events_file
);
300 bool mem_cgroup_low(struct mem_cgroup
*root
, struct mem_cgroup
*memcg
);
302 int mem_cgroup_try_charge(struct page
*page
, struct mm_struct
*mm
,
303 gfp_t gfp_mask
, struct mem_cgroup
**memcgp
,
305 void mem_cgroup_commit_charge(struct page
*page
, struct mem_cgroup
*memcg
,
306 bool lrucare
, bool compound
);
307 void mem_cgroup_cancel_charge(struct page
*page
, struct mem_cgroup
*memcg
,
309 void mem_cgroup_uncharge(struct page
*page
);
310 void mem_cgroup_uncharge_list(struct list_head
*page_list
);
312 void mem_cgroup_migrate(struct page
*oldpage
, struct page
*newpage
);
314 static struct mem_cgroup_per_node
*
315 mem_cgroup_nodeinfo(struct mem_cgroup
*memcg
, int nid
)
317 return memcg
->nodeinfo
[nid
];
321 * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone
322 * @node: node of the wanted lruvec
323 * @memcg: memcg of the wanted lruvec
325 * Returns the lru list vector holding pages for a given @node or a given
326 * @memcg and @zone. This can be the node lruvec, if the memory controller
329 static inline struct lruvec
*mem_cgroup_lruvec(struct pglist_data
*pgdat
,
330 struct mem_cgroup
*memcg
)
332 struct mem_cgroup_per_node
*mz
;
333 struct lruvec
*lruvec
;
335 if (mem_cgroup_disabled()) {
336 lruvec
= node_lruvec(pgdat
);
340 mz
= mem_cgroup_nodeinfo(memcg
, pgdat
->node_id
);
341 lruvec
= &mz
->lruvec
;
344 * Since a node can be onlined after the mem_cgroup was created,
345 * we have to be prepared to initialize lruvec->pgdat here;
346 * and if offlined then reonlined, we need to reinitialize it.
348 if (unlikely(lruvec
->pgdat
!= pgdat
))
349 lruvec
->pgdat
= pgdat
;
353 struct lruvec
*mem_cgroup_page_lruvec(struct page
*, struct pglist_data
*);
355 bool task_in_mem_cgroup(struct task_struct
*task
, struct mem_cgroup
*memcg
);
356 struct mem_cgroup
*mem_cgroup_from_task(struct task_struct
*p
);
359 struct mem_cgroup
*mem_cgroup_from_css(struct cgroup_subsys_state
*css
){
360 return css
? container_of(css
, struct mem_cgroup
, css
) : NULL
;
363 #define mem_cgroup_from_counter(counter, member) \
364 container_of(counter, struct mem_cgroup, member)
366 struct mem_cgroup
*mem_cgroup_iter(struct mem_cgroup
*,
368 struct mem_cgroup_reclaim_cookie
*);
369 void mem_cgroup_iter_break(struct mem_cgroup
*, struct mem_cgroup
*);
370 int mem_cgroup_scan_tasks(struct mem_cgroup
*,
371 int (*)(struct task_struct
*, void *), void *);
373 static inline unsigned short mem_cgroup_id(struct mem_cgroup
*memcg
)
375 if (mem_cgroup_disabled())
380 struct mem_cgroup
*mem_cgroup_from_id(unsigned short id
);
383 * parent_mem_cgroup - find the accounting parent of a memcg
384 * @memcg: memcg whose parent to find
386 * Returns the parent memcg, or NULL if this is the root or the memory
387 * controller is in legacy no-hierarchy mode.
389 static inline struct mem_cgroup
*parent_mem_cgroup(struct mem_cgroup
*memcg
)
391 if (!memcg
->memory
.parent
)
393 return mem_cgroup_from_counter(memcg
->memory
.parent
, memory
);
396 static inline bool mem_cgroup_is_descendant(struct mem_cgroup
*memcg
,
397 struct mem_cgroup
*root
)
401 if (!root
->use_hierarchy
)
403 return cgroup_is_descendant(memcg
->css
.cgroup
, root
->css
.cgroup
);
406 static inline bool mm_match_cgroup(struct mm_struct
*mm
,
407 struct mem_cgroup
*memcg
)
409 struct mem_cgroup
*task_memcg
;
413 task_memcg
= mem_cgroup_from_task(rcu_dereference(mm
->owner
));
415 match
= mem_cgroup_is_descendant(task_memcg
, memcg
);
420 struct cgroup_subsys_state
*mem_cgroup_css_from_page(struct page
*page
);
421 ino_t
page_cgroup_ino(struct page
*page
);
423 static inline bool mem_cgroup_online(struct mem_cgroup
*memcg
)
425 if (mem_cgroup_disabled())
427 return !!(memcg
->css
.flags
& CSS_ONLINE
);
431 * For memory reclaim.
433 int mem_cgroup_select_victim_node(struct mem_cgroup
*memcg
);
435 void mem_cgroup_update_lru_size(struct lruvec
*lruvec
, enum lru_list lru
,
436 int zid
, int nr_pages
);
438 unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup
*memcg
,
439 int nid
, unsigned int lru_mask
);
442 unsigned long mem_cgroup_get_lru_size(struct lruvec
*lruvec
, enum lru_list lru
)
444 struct mem_cgroup_per_node
*mz
;
445 unsigned long nr_pages
= 0;
448 mz
= container_of(lruvec
, struct mem_cgroup_per_node
, lruvec
);
449 for (zid
= 0; zid
< MAX_NR_ZONES
; zid
++)
450 nr_pages
+= mz
->lru_zone_size
[zid
][lru
];
455 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec
*lruvec
,
456 enum lru_list lru
, int zone_idx
)
458 struct mem_cgroup_per_node
*mz
;
460 mz
= container_of(lruvec
, struct mem_cgroup_per_node
, lruvec
);
461 return mz
->lru_zone_size
[zone_idx
][lru
];
464 void mem_cgroup_handle_over_high(void);
466 unsigned long mem_cgroup_get_limit(struct mem_cgroup
*memcg
);
468 void mem_cgroup_print_oom_info(struct mem_cgroup
*memcg
,
469 struct task_struct
*p
);
471 static inline void mem_cgroup_oom_enable(void)
473 WARN_ON(current
->memcg_may_oom
);
474 current
->memcg_may_oom
= 1;
477 static inline void mem_cgroup_oom_disable(void)
479 WARN_ON(!current
->memcg_may_oom
);
480 current
->memcg_may_oom
= 0;
483 static inline bool task_in_memcg_oom(struct task_struct
*p
)
485 return p
->memcg_in_oom
;
488 bool mem_cgroup_oom_synchronize(bool wait
);
490 #ifdef CONFIG_MEMCG_SWAP
491 extern int do_swap_account
;
494 void lock_page_memcg(struct page
*page
);
495 void unlock_page_memcg(struct page
*page
);
498 * mem_cgroup_update_page_stat - update page state statistics
500 * @idx: page state item to account
501 * @val: number of pages (positive or negative)
503 * The @page must be locked or the caller must use lock_page_memcg()
504 * to prevent double accounting when the page is concurrently being
505 * moved to another memcg:
507 * lock_page(page) or lock_page_memcg(page)
508 * if (TestClearPageState(page))
509 * mem_cgroup_update_page_stat(page, state, -1);
510 * unlock_page(page) or unlock_page_memcg(page)
512 static inline void mem_cgroup_update_page_stat(struct page
*page
,
513 enum mem_cgroup_stat_index idx
, int val
)
515 VM_BUG_ON(!(rcu_read_lock_held() || PageLocked(page
)));
517 if (page
->mem_cgroup
)
518 this_cpu_add(page
->mem_cgroup
->stat
->count
[idx
], val
);
521 static inline void mem_cgroup_inc_page_stat(struct page
*page
,
522 enum mem_cgroup_stat_index idx
)
524 mem_cgroup_update_page_stat(page
, idx
, 1);
527 static inline void mem_cgroup_dec_page_stat(struct page
*page
,
528 enum mem_cgroup_stat_index idx
)
530 mem_cgroup_update_page_stat(page
, idx
, -1);
533 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t
*pgdat
, int order
,
535 unsigned long *total_scanned
);
537 static inline void mem_cgroup_count_vm_event(struct mm_struct
*mm
,
538 enum vm_event_item idx
)
540 struct mem_cgroup
*memcg
;
542 if (mem_cgroup_disabled())
546 memcg
= mem_cgroup_from_task(rcu_dereference(mm
->owner
));
547 if (unlikely(!memcg
))
552 this_cpu_inc(memcg
->stat
->events
[MEM_CGROUP_EVENTS_PGFAULT
]);
555 this_cpu_inc(memcg
->stat
->events
[MEM_CGROUP_EVENTS_PGMAJFAULT
]);
563 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
564 void mem_cgroup_split_huge_fixup(struct page
*head
);
567 #else /* CONFIG_MEMCG */
569 #define MEM_CGROUP_ID_SHIFT 0
570 #define MEM_CGROUP_ID_MAX 0
574 static inline bool mem_cgroup_disabled(void)
579 static inline void mem_cgroup_events(struct mem_cgroup
*memcg
,
580 enum mem_cgroup_events_index idx
,
585 static inline bool mem_cgroup_low(struct mem_cgroup
*root
,
586 struct mem_cgroup
*memcg
)
591 static inline int mem_cgroup_try_charge(struct page
*page
, struct mm_struct
*mm
,
593 struct mem_cgroup
**memcgp
,
600 static inline void mem_cgroup_commit_charge(struct page
*page
,
601 struct mem_cgroup
*memcg
,
602 bool lrucare
, bool compound
)
606 static inline void mem_cgroup_cancel_charge(struct page
*page
,
607 struct mem_cgroup
*memcg
,
612 static inline void mem_cgroup_uncharge(struct page
*page
)
616 static inline void mem_cgroup_uncharge_list(struct list_head
*page_list
)
620 static inline void mem_cgroup_migrate(struct page
*old
, struct page
*new)
624 static inline struct lruvec
*mem_cgroup_lruvec(struct pglist_data
*pgdat
,
625 struct mem_cgroup
*memcg
)
627 return node_lruvec(pgdat
);
630 static inline struct lruvec
*mem_cgroup_page_lruvec(struct page
*page
,
631 struct pglist_data
*pgdat
)
633 return &pgdat
->lruvec
;
636 static inline bool mm_match_cgroup(struct mm_struct
*mm
,
637 struct mem_cgroup
*memcg
)
642 static inline bool task_in_mem_cgroup(struct task_struct
*task
,
643 const struct mem_cgroup
*memcg
)
648 static inline struct mem_cgroup
*
649 mem_cgroup_iter(struct mem_cgroup
*root
,
650 struct mem_cgroup
*prev
,
651 struct mem_cgroup_reclaim_cookie
*reclaim
)
656 static inline void mem_cgroup_iter_break(struct mem_cgroup
*root
,
657 struct mem_cgroup
*prev
)
661 static inline int mem_cgroup_scan_tasks(struct mem_cgroup
*memcg
,
662 int (*fn
)(struct task_struct
*, void *), void *arg
)
667 static inline unsigned short mem_cgroup_id(struct mem_cgroup
*memcg
)
672 static inline struct mem_cgroup
*mem_cgroup_from_id(unsigned short id
)
675 /* XXX: This should always return root_mem_cgroup */
679 static inline bool mem_cgroup_online(struct mem_cgroup
*memcg
)
684 static inline unsigned long
685 mem_cgroup_get_lru_size(struct lruvec
*lruvec
, enum lru_list lru
)
690 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec
*lruvec
,
691 enum lru_list lru
, int zone_idx
)
696 static inline unsigned long
697 mem_cgroup_node_nr_lru_pages(struct mem_cgroup
*memcg
,
698 int nid
, unsigned int lru_mask
)
703 static inline unsigned long mem_cgroup_get_limit(struct mem_cgroup
*memcg
)
709 mem_cgroup_print_oom_info(struct mem_cgroup
*memcg
, struct task_struct
*p
)
713 static inline void lock_page_memcg(struct page
*page
)
717 static inline void unlock_page_memcg(struct page
*page
)
721 static inline void mem_cgroup_handle_over_high(void)
725 static inline void mem_cgroup_oom_enable(void)
729 static inline void mem_cgroup_oom_disable(void)
733 static inline bool task_in_memcg_oom(struct task_struct
*p
)
738 static inline bool mem_cgroup_oom_synchronize(bool wait
)
743 static inline void mem_cgroup_inc_page_stat(struct page
*page
,
744 enum mem_cgroup_stat_index idx
)
748 static inline void mem_cgroup_dec_page_stat(struct page
*page
,
749 enum mem_cgroup_stat_index idx
)
754 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t
*pgdat
, int order
,
756 unsigned long *total_scanned
)
761 static inline void mem_cgroup_split_huge_fixup(struct page
*head
)
766 void mem_cgroup_count_vm_event(struct mm_struct
*mm
, enum vm_event_item idx
)
769 #endif /* CONFIG_MEMCG */
771 #ifdef CONFIG_CGROUP_WRITEBACK
773 struct list_head
*mem_cgroup_cgwb_list(struct mem_cgroup
*memcg
);
774 struct wb_domain
*mem_cgroup_wb_domain(struct bdi_writeback
*wb
);
775 void mem_cgroup_wb_stats(struct bdi_writeback
*wb
, unsigned long *pfilepages
,
776 unsigned long *pheadroom
, unsigned long *pdirty
,
777 unsigned long *pwriteback
);
779 #else /* CONFIG_CGROUP_WRITEBACK */
781 static inline struct wb_domain
*mem_cgroup_wb_domain(struct bdi_writeback
*wb
)
786 static inline void mem_cgroup_wb_stats(struct bdi_writeback
*wb
,
787 unsigned long *pfilepages
,
788 unsigned long *pheadroom
,
789 unsigned long *pdirty
,
790 unsigned long *pwriteback
)
794 #endif /* CONFIG_CGROUP_WRITEBACK */
797 bool mem_cgroup_charge_skmem(struct mem_cgroup
*memcg
, unsigned int nr_pages
);
798 void mem_cgroup_uncharge_skmem(struct mem_cgroup
*memcg
, unsigned int nr_pages
);
800 extern struct static_key_false memcg_sockets_enabled_key
;
801 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
802 void mem_cgroup_sk_alloc(struct sock
*sk
);
803 void mem_cgroup_sk_free(struct sock
*sk
);
804 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup
*memcg
)
806 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys
) && memcg
->tcpmem_pressure
)
809 if (time_before(jiffies
, memcg
->socket_pressure
))
811 } while ((memcg
= parent_mem_cgroup(memcg
)));
815 #define mem_cgroup_sockets_enabled 0
816 static inline void mem_cgroup_sk_alloc(struct sock
*sk
) { };
817 static inline void mem_cgroup_sk_free(struct sock
*sk
) { };
818 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup
*memcg
)
824 struct kmem_cache
*memcg_kmem_get_cache(struct kmem_cache
*cachep
);
825 void memcg_kmem_put_cache(struct kmem_cache
*cachep
);
826 int memcg_kmem_charge_memcg(struct page
*page
, gfp_t gfp
, int order
,
827 struct mem_cgroup
*memcg
);
828 int memcg_kmem_charge(struct page
*page
, gfp_t gfp
, int order
);
829 void memcg_kmem_uncharge(struct page
*page
, int order
);
831 #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
832 extern struct static_key_false memcg_kmem_enabled_key
;
833 extern struct workqueue_struct
*memcg_kmem_cache_wq
;
835 extern int memcg_nr_cache_ids
;
836 void memcg_get_cache_ids(void);
837 void memcg_put_cache_ids(void);
840 * Helper macro to loop through all memcg-specific caches. Callers must still
841 * check if the cache is valid (it is either valid or NULL).
842 * the slab_mutex must be held when looping through those caches
844 #define for_each_memcg_cache_index(_idx) \
845 for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++)
847 static inline bool memcg_kmem_enabled(void)
849 return static_branch_unlikely(&memcg_kmem_enabled_key
);
853 * helper for accessing a memcg's index. It will be used as an index in the
854 * child cache array in kmem_cache, and also to derive its name. This function
855 * will return -1 when this is not a kmem-limited memcg.
857 static inline int memcg_cache_id(struct mem_cgroup
*memcg
)
859 return memcg
? memcg
->kmemcg_id
: -1;
863 * memcg_kmem_update_page_stat - update kmem page state statistics
865 * @idx: page state item to account
866 * @val: number of pages (positive or negative)
868 static inline void memcg_kmem_update_page_stat(struct page
*page
,
869 enum mem_cgroup_stat_index idx
, int val
)
871 if (memcg_kmem_enabled() && page
->mem_cgroup
)
872 this_cpu_add(page
->mem_cgroup
->stat
->count
[idx
], val
);
876 #define for_each_memcg_cache_index(_idx) \
879 static inline bool memcg_kmem_enabled(void)
884 static inline int memcg_cache_id(struct mem_cgroup
*memcg
)
889 static inline void memcg_get_cache_ids(void)
893 static inline void memcg_put_cache_ids(void)
897 static inline void memcg_kmem_update_page_stat(struct page
*page
,
898 enum mem_cgroup_stat_index idx
, int val
)
901 #endif /* CONFIG_MEMCG && !CONFIG_SLOB */
903 #endif /* _LINUX_MEMCONTROL_H */