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_SHMEM
, /* # of pages charged as shmem */
50 MEM_CGROUP_STAT_FILE_MAPPED
, /* # of pages charged as file rss */
51 MEM_CGROUP_STAT_DIRTY
, /* # of dirty pages in page cache */
52 MEM_CGROUP_STAT_WRITEBACK
, /* # of pages under writeback */
53 MEM_CGROUP_STAT_SWAP
, /* # of pages, swapped out */
54 MEM_CGROUP_STAT_NSTATS
,
55 /* default hierarchy stats */
56 MEMCG_KERNEL_STACK_KB
= MEM_CGROUP_STAT_NSTATS
,
57 MEMCG_SLAB_RECLAIMABLE
,
58 MEMCG_SLAB_UNRECLAIMABLE
,
60 MEMCG_WORKINGSET_REFAULT
,
61 MEMCG_WORKINGSET_ACTIVATE
,
62 MEMCG_WORKINGSET_NODERECLAIM
,
66 struct mem_cgroup_reclaim_cookie
{
69 unsigned int generation
;
72 enum mem_cgroup_events_index
{
73 MEM_CGROUP_EVENTS_PGPGIN
, /* # of pages paged in */
74 MEM_CGROUP_EVENTS_PGPGOUT
, /* # of pages paged out */
75 MEM_CGROUP_EVENTS_PGFAULT
, /* # of page-faults */
76 MEM_CGROUP_EVENTS_PGMAJFAULT
, /* # of major page-faults */
77 MEM_CGROUP_EVENTS_NSTATS
,
78 /* default hierarchy events */
79 MEMCG_LOW
= MEM_CGROUP_EVENTS_NSTATS
,
87 * Per memcg event counter is incremented at every pagein/pageout. With THP,
88 * it will be incremated by the number of pages. This counter is used for
89 * for trigger some periodic events. This is straightforward and better
90 * than using jiffies etc. to handle periodic memcg event.
92 enum mem_cgroup_events_target
{
93 MEM_CGROUP_TARGET_THRESH
,
94 MEM_CGROUP_TARGET_SOFTLIMIT
,
95 MEM_CGROUP_TARGET_NUMAINFO
,
101 #define MEM_CGROUP_ID_SHIFT 16
102 #define MEM_CGROUP_ID_MAX USHRT_MAX
104 struct mem_cgroup_id
{
109 struct mem_cgroup_stat_cpu
{
110 long count
[MEMCG_NR_STAT
];
111 unsigned long events
[MEMCG_NR_EVENTS
];
112 unsigned long nr_page_events
;
113 unsigned long targets
[MEM_CGROUP_NTARGETS
];
116 struct mem_cgroup_reclaim_iter
{
117 struct mem_cgroup
*position
;
118 /* scan generation, increased every round-trip */
119 unsigned int generation
;
123 * per-zone information in memory controller.
125 struct mem_cgroup_per_node
{
126 struct lruvec lruvec
;
127 unsigned long lru_zone_size
[MAX_NR_ZONES
][NR_LRU_LISTS
];
129 struct mem_cgroup_reclaim_iter iter
[DEF_PRIORITY
+ 1];
131 struct rb_node tree_node
; /* RB tree node */
132 unsigned long usage_in_excess
;/* Set to the value by which */
133 /* the soft limit is exceeded*/
135 struct mem_cgroup
*memcg
; /* Back pointer, we cannot */
136 /* use container_of */
139 struct mem_cgroup_threshold
{
140 struct eventfd_ctx
*eventfd
;
141 unsigned long threshold
;
145 struct mem_cgroup_threshold_ary
{
146 /* An array index points to threshold just below or equal to usage. */
147 int current_threshold
;
148 /* Size of entries[] */
150 /* Array of thresholds */
151 struct mem_cgroup_threshold entries
[0];
154 struct mem_cgroup_thresholds
{
155 /* Primary thresholds array */
156 struct mem_cgroup_threshold_ary
*primary
;
158 * Spare threshold array.
159 * This is needed to make mem_cgroup_unregister_event() "never fail".
160 * It must be able to store at least primary->size - 1 entries.
162 struct mem_cgroup_threshold_ary
*spare
;
165 enum memcg_kmem_state
{
172 * The memory controller data structure. The memory controller controls both
173 * page cache and RSS per cgroup. We would eventually like to provide
174 * statistics based on the statistics developed by Rik Van Riel for clock-pro,
175 * to help the administrator determine what knobs to tune.
178 struct cgroup_subsys_state css
;
180 /* Private memcg ID. Used to ID objects that outlive the cgroup */
181 struct mem_cgroup_id id
;
183 /* Accounted resources */
184 struct page_counter memory
;
185 struct page_counter swap
;
187 /* Legacy consumer-oriented counters */
188 struct page_counter memsw
;
189 struct page_counter kmem
;
190 struct page_counter tcpmem
;
192 /* Normal memory consumption range */
196 /* Range enforcement for interrupt charges */
197 struct work_struct high_work
;
199 unsigned long soft_limit
;
201 /* vmpressure notifications */
202 struct vmpressure vmpressure
;
205 * Should the accounting and control be hierarchical, per subtree?
209 /* protected by memcg_oom_lock */
214 /* OOM-Killer disable */
215 int oom_kill_disable
;
217 /* handle for "memory.events" */
218 struct cgroup_file events_file
;
220 /* protect arrays of thresholds */
221 struct mutex thresholds_lock
;
223 /* thresholds for memory usage. RCU-protected */
224 struct mem_cgroup_thresholds thresholds
;
226 /* thresholds for mem+swap usage. RCU-protected */
227 struct mem_cgroup_thresholds memsw_thresholds
;
229 /* For oom notifier event fd */
230 struct list_head oom_notify
;
233 * Should we move charges of a task when a task is moved into this
234 * mem_cgroup ? And what type of charges should we move ?
236 unsigned long move_charge_at_immigrate
;
238 * set > 0 if pages under this cgroup are moving to other cgroup.
240 atomic_t moving_account
;
241 /* taken only while moving_account > 0 */
242 spinlock_t move_lock
;
243 struct task_struct
*move_lock_task
;
244 unsigned long move_lock_flags
;
248 struct mem_cgroup_stat_cpu __percpu
*stat
;
250 unsigned long socket_pressure
;
252 /* Legacy tcp memory accounting */
257 /* Index in the kmem_cache->memcg_params.memcg_caches array */
259 enum memcg_kmem_state kmem_state
;
260 struct list_head kmem_caches
;
263 int last_scanned_node
;
265 nodemask_t scan_nodes
;
266 atomic_t numainfo_events
;
267 atomic_t numainfo_updating
;
270 #ifdef CONFIG_CGROUP_WRITEBACK
271 struct list_head cgwb_list
;
272 struct wb_domain cgwb_domain
;
275 /* List of events which userspace want to receive */
276 struct list_head event_list
;
277 spinlock_t event_list_lock
;
279 struct mem_cgroup_per_node
*nodeinfo
[0];
280 /* WARNING: nodeinfo must be the last member here */
283 extern struct mem_cgroup
*root_mem_cgroup
;
285 static inline bool mem_cgroup_disabled(void)
287 return !cgroup_subsys_enabled(memory_cgrp_subsys
);
291 * mem_cgroup_events - count memory events against a cgroup
292 * @memcg: the memory cgroup
293 * @idx: the event index
294 * @nr: the number of events to account for
296 static inline void mem_cgroup_events(struct mem_cgroup
*memcg
,
297 enum mem_cgroup_events_index idx
,
300 this_cpu_add(memcg
->stat
->events
[idx
], nr
);
301 cgroup_file_notify(&memcg
->events_file
);
304 bool mem_cgroup_low(struct mem_cgroup
*root
, struct mem_cgroup
*memcg
);
306 int mem_cgroup_try_charge(struct page
*page
, struct mm_struct
*mm
,
307 gfp_t gfp_mask
, struct mem_cgroup
**memcgp
,
309 void mem_cgroup_commit_charge(struct page
*page
, struct mem_cgroup
*memcg
,
310 bool lrucare
, bool compound
);
311 void mem_cgroup_cancel_charge(struct page
*page
, struct mem_cgroup
*memcg
,
313 void mem_cgroup_uncharge(struct page
*page
);
314 void mem_cgroup_uncharge_list(struct list_head
*page_list
);
316 void mem_cgroup_migrate(struct page
*oldpage
, struct page
*newpage
);
318 static struct mem_cgroup_per_node
*
319 mem_cgroup_nodeinfo(struct mem_cgroup
*memcg
, int nid
)
321 return memcg
->nodeinfo
[nid
];
325 * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone
326 * @node: node of the wanted lruvec
327 * @memcg: memcg of the wanted lruvec
329 * Returns the lru list vector holding pages for a given @node or a given
330 * @memcg and @zone. This can be the node lruvec, if the memory controller
333 static inline struct lruvec
*mem_cgroup_lruvec(struct pglist_data
*pgdat
,
334 struct mem_cgroup
*memcg
)
336 struct mem_cgroup_per_node
*mz
;
337 struct lruvec
*lruvec
;
339 if (mem_cgroup_disabled()) {
340 lruvec
= node_lruvec(pgdat
);
344 mz
= mem_cgroup_nodeinfo(memcg
, pgdat
->node_id
);
345 lruvec
= &mz
->lruvec
;
348 * Since a node can be onlined after the mem_cgroup was created,
349 * we have to be prepared to initialize lruvec->pgdat here;
350 * and if offlined then reonlined, we need to reinitialize it.
352 if (unlikely(lruvec
->pgdat
!= pgdat
))
353 lruvec
->pgdat
= pgdat
;
357 struct lruvec
*mem_cgroup_page_lruvec(struct page
*, struct pglist_data
*);
359 bool task_in_mem_cgroup(struct task_struct
*task
, struct mem_cgroup
*memcg
);
360 struct mem_cgroup
*mem_cgroup_from_task(struct task_struct
*p
);
363 struct mem_cgroup
*mem_cgroup_from_css(struct cgroup_subsys_state
*css
){
364 return css
? container_of(css
, struct mem_cgroup
, css
) : NULL
;
367 #define mem_cgroup_from_counter(counter, member) \
368 container_of(counter, struct mem_cgroup, member)
370 struct mem_cgroup
*mem_cgroup_iter(struct mem_cgroup
*,
372 struct mem_cgroup_reclaim_cookie
*);
373 void mem_cgroup_iter_break(struct mem_cgroup
*, struct mem_cgroup
*);
374 int mem_cgroup_scan_tasks(struct mem_cgroup
*,
375 int (*)(struct task_struct
*, void *), void *);
377 static inline unsigned short mem_cgroup_id(struct mem_cgroup
*memcg
)
379 if (mem_cgroup_disabled())
384 struct mem_cgroup
*mem_cgroup_from_id(unsigned short id
);
387 * parent_mem_cgroup - find the accounting parent of a memcg
388 * @memcg: memcg whose parent to find
390 * Returns the parent memcg, or NULL if this is the root or the memory
391 * controller is in legacy no-hierarchy mode.
393 static inline struct mem_cgroup
*parent_mem_cgroup(struct mem_cgroup
*memcg
)
395 if (!memcg
->memory
.parent
)
397 return mem_cgroup_from_counter(memcg
->memory
.parent
, memory
);
400 static inline bool mem_cgroup_is_descendant(struct mem_cgroup
*memcg
,
401 struct mem_cgroup
*root
)
405 if (!root
->use_hierarchy
)
407 return cgroup_is_descendant(memcg
->css
.cgroup
, root
->css
.cgroup
);
410 static inline bool mm_match_cgroup(struct mm_struct
*mm
,
411 struct mem_cgroup
*memcg
)
413 struct mem_cgroup
*task_memcg
;
417 task_memcg
= mem_cgroup_from_task(rcu_dereference(mm
->owner
));
419 match
= mem_cgroup_is_descendant(task_memcg
, memcg
);
424 struct cgroup_subsys_state
*mem_cgroup_css_from_page(struct page
*page
);
425 ino_t
page_cgroup_ino(struct page
*page
);
427 static inline bool mem_cgroup_online(struct mem_cgroup
*memcg
)
429 if (mem_cgroup_disabled())
431 return !!(memcg
->css
.flags
& CSS_ONLINE
);
435 * For memory reclaim.
437 int mem_cgroup_select_victim_node(struct mem_cgroup
*memcg
);
439 void mem_cgroup_update_lru_size(struct lruvec
*lruvec
, enum lru_list lru
,
440 int zid
, int nr_pages
);
442 unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup
*memcg
,
443 int nid
, unsigned int lru_mask
);
446 unsigned long mem_cgroup_get_lru_size(struct lruvec
*lruvec
, enum lru_list lru
)
448 struct mem_cgroup_per_node
*mz
;
449 unsigned long nr_pages
= 0;
452 mz
= container_of(lruvec
, struct mem_cgroup_per_node
, lruvec
);
453 for (zid
= 0; zid
< MAX_NR_ZONES
; zid
++)
454 nr_pages
+= mz
->lru_zone_size
[zid
][lru
];
459 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec
*lruvec
,
460 enum lru_list lru
, int zone_idx
)
462 struct mem_cgroup_per_node
*mz
;
464 mz
= container_of(lruvec
, struct mem_cgroup_per_node
, lruvec
);
465 return mz
->lru_zone_size
[zone_idx
][lru
];
468 void mem_cgroup_handle_over_high(void);
470 unsigned long mem_cgroup_get_limit(struct mem_cgroup
*memcg
);
472 void mem_cgroup_print_oom_info(struct mem_cgroup
*memcg
,
473 struct task_struct
*p
);
475 static inline void mem_cgroup_oom_enable(void)
477 WARN_ON(current
->memcg_may_oom
);
478 current
->memcg_may_oom
= 1;
481 static inline void mem_cgroup_oom_disable(void)
483 WARN_ON(!current
->memcg_may_oom
);
484 current
->memcg_may_oom
= 0;
487 static inline bool task_in_memcg_oom(struct task_struct
*p
)
489 return p
->memcg_in_oom
;
492 bool mem_cgroup_oom_synchronize(bool wait
);
494 #ifdef CONFIG_MEMCG_SWAP
495 extern int do_swap_account
;
498 void lock_page_memcg(struct page
*page
);
499 void unlock_page_memcg(struct page
*page
);
501 static inline unsigned long mem_cgroup_read_stat(struct mem_cgroup
*memcg
,
502 enum mem_cgroup_stat_index idx
)
507 for_each_possible_cpu(cpu
)
508 val
+= per_cpu(memcg
->stat
->count
[idx
], cpu
);
516 static inline void mem_cgroup_update_stat(struct mem_cgroup
*memcg
,
517 enum mem_cgroup_stat_index idx
, int val
)
519 if (!mem_cgroup_disabled())
520 this_cpu_add(memcg
->stat
->count
[idx
], val
);
523 static inline void mem_cgroup_inc_stat(struct mem_cgroup
*memcg
,
524 enum mem_cgroup_stat_index idx
)
526 mem_cgroup_update_stat(memcg
, idx
, 1);
529 static inline void mem_cgroup_dec_stat(struct mem_cgroup
*memcg
,
530 enum mem_cgroup_stat_index idx
)
532 mem_cgroup_update_stat(memcg
, idx
, -1);
536 * mem_cgroup_update_page_stat - update page state statistics
538 * @idx: page state item to account
539 * @val: number of pages (positive or negative)
541 * The @page must be locked or the caller must use lock_page_memcg()
542 * to prevent double accounting when the page is concurrently being
543 * moved to another memcg:
545 * lock_page(page) or lock_page_memcg(page)
546 * if (TestClearPageState(page))
547 * mem_cgroup_update_page_stat(page, state, -1);
548 * unlock_page(page) or unlock_page_memcg(page)
550 * Kernel pages are an exception to this, since they'll never move.
552 static inline void mem_cgroup_update_page_stat(struct page
*page
,
553 enum mem_cgroup_stat_index idx
, int val
)
555 if (page
->mem_cgroup
)
556 mem_cgroup_update_stat(page
->mem_cgroup
, idx
, val
);
559 static inline void mem_cgroup_inc_page_stat(struct page
*page
,
560 enum mem_cgroup_stat_index idx
)
562 mem_cgroup_update_page_stat(page
, idx
, 1);
565 static inline void mem_cgroup_dec_page_stat(struct page
*page
,
566 enum mem_cgroup_stat_index idx
)
568 mem_cgroup_update_page_stat(page
, idx
, -1);
571 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t
*pgdat
, int order
,
573 unsigned long *total_scanned
);
575 static inline void mem_cgroup_count_vm_event(struct mm_struct
*mm
,
576 enum vm_event_item idx
)
578 struct mem_cgroup
*memcg
;
580 if (mem_cgroup_disabled())
584 memcg
= mem_cgroup_from_task(rcu_dereference(mm
->owner
));
585 if (unlikely(!memcg
))
590 this_cpu_inc(memcg
->stat
->events
[MEM_CGROUP_EVENTS_PGFAULT
]);
593 this_cpu_inc(memcg
->stat
->events
[MEM_CGROUP_EVENTS_PGMAJFAULT
]);
601 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
602 void mem_cgroup_split_huge_fixup(struct page
*head
);
605 #else /* CONFIG_MEMCG */
607 #define MEM_CGROUP_ID_SHIFT 0
608 #define MEM_CGROUP_ID_MAX 0
612 static inline bool mem_cgroup_disabled(void)
617 static inline void mem_cgroup_events(struct mem_cgroup
*memcg
,
618 enum mem_cgroup_events_index idx
,
623 static inline bool mem_cgroup_low(struct mem_cgroup
*root
,
624 struct mem_cgroup
*memcg
)
629 static inline int mem_cgroup_try_charge(struct page
*page
, struct mm_struct
*mm
,
631 struct mem_cgroup
**memcgp
,
638 static inline void mem_cgroup_commit_charge(struct page
*page
,
639 struct mem_cgroup
*memcg
,
640 bool lrucare
, bool compound
)
644 static inline void mem_cgroup_cancel_charge(struct page
*page
,
645 struct mem_cgroup
*memcg
,
650 static inline void mem_cgroup_uncharge(struct page
*page
)
654 static inline void mem_cgroup_uncharge_list(struct list_head
*page_list
)
658 static inline void mem_cgroup_migrate(struct page
*old
, struct page
*new)
662 static inline struct lruvec
*mem_cgroup_lruvec(struct pglist_data
*pgdat
,
663 struct mem_cgroup
*memcg
)
665 return node_lruvec(pgdat
);
668 static inline struct lruvec
*mem_cgroup_page_lruvec(struct page
*page
,
669 struct pglist_data
*pgdat
)
671 return &pgdat
->lruvec
;
674 static inline bool mm_match_cgroup(struct mm_struct
*mm
,
675 struct mem_cgroup
*memcg
)
680 static inline bool task_in_mem_cgroup(struct task_struct
*task
,
681 const struct mem_cgroup
*memcg
)
686 static inline struct mem_cgroup
*
687 mem_cgroup_iter(struct mem_cgroup
*root
,
688 struct mem_cgroup
*prev
,
689 struct mem_cgroup_reclaim_cookie
*reclaim
)
694 static inline void mem_cgroup_iter_break(struct mem_cgroup
*root
,
695 struct mem_cgroup
*prev
)
699 static inline int mem_cgroup_scan_tasks(struct mem_cgroup
*memcg
,
700 int (*fn
)(struct task_struct
*, void *), void *arg
)
705 static inline unsigned short mem_cgroup_id(struct mem_cgroup
*memcg
)
710 static inline struct mem_cgroup
*mem_cgroup_from_id(unsigned short id
)
713 /* XXX: This should always return root_mem_cgroup */
717 static inline bool mem_cgroup_online(struct mem_cgroup
*memcg
)
722 static inline unsigned long
723 mem_cgroup_get_lru_size(struct lruvec
*lruvec
, enum lru_list lru
)
728 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec
*lruvec
,
729 enum lru_list lru
, int zone_idx
)
734 static inline unsigned long
735 mem_cgroup_node_nr_lru_pages(struct mem_cgroup
*memcg
,
736 int nid
, unsigned int lru_mask
)
741 static inline unsigned long mem_cgroup_get_limit(struct mem_cgroup
*memcg
)
747 mem_cgroup_print_oom_info(struct mem_cgroup
*memcg
, struct task_struct
*p
)
751 static inline void lock_page_memcg(struct page
*page
)
755 static inline void unlock_page_memcg(struct page
*page
)
759 static inline void mem_cgroup_handle_over_high(void)
763 static inline void mem_cgroup_oom_enable(void)
767 static inline void mem_cgroup_oom_disable(void)
771 static inline bool task_in_memcg_oom(struct task_struct
*p
)
776 static inline bool mem_cgroup_oom_synchronize(bool wait
)
781 static inline unsigned long mem_cgroup_read_stat(struct mem_cgroup
*memcg
,
782 enum mem_cgroup_stat_index idx
)
787 static inline void mem_cgroup_update_stat(struct mem_cgroup
*memcg
,
788 enum mem_cgroup_stat_index idx
, int val
)
792 static inline void mem_cgroup_inc_stat(struct mem_cgroup
*memcg
,
793 enum mem_cgroup_stat_index idx
)
797 static inline void mem_cgroup_dec_stat(struct mem_cgroup
*memcg
,
798 enum mem_cgroup_stat_index idx
)
802 static inline void mem_cgroup_update_page_stat(struct page
*page
,
803 enum mem_cgroup_stat_index idx
,
808 static inline void mem_cgroup_inc_page_stat(struct page
*page
,
809 enum mem_cgroup_stat_index idx
)
813 static inline void mem_cgroup_dec_page_stat(struct page
*page
,
814 enum mem_cgroup_stat_index idx
)
819 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t
*pgdat
, int order
,
821 unsigned long *total_scanned
)
826 static inline void mem_cgroup_split_huge_fixup(struct page
*head
)
831 void mem_cgroup_count_vm_event(struct mm_struct
*mm
, enum vm_event_item idx
)
834 #endif /* CONFIG_MEMCG */
836 #ifdef CONFIG_CGROUP_WRITEBACK
838 struct list_head
*mem_cgroup_cgwb_list(struct mem_cgroup
*memcg
);
839 struct wb_domain
*mem_cgroup_wb_domain(struct bdi_writeback
*wb
);
840 void mem_cgroup_wb_stats(struct bdi_writeback
*wb
, unsigned long *pfilepages
,
841 unsigned long *pheadroom
, unsigned long *pdirty
,
842 unsigned long *pwriteback
);
844 #else /* CONFIG_CGROUP_WRITEBACK */
846 static inline struct wb_domain
*mem_cgroup_wb_domain(struct bdi_writeback
*wb
)
851 static inline void mem_cgroup_wb_stats(struct bdi_writeback
*wb
,
852 unsigned long *pfilepages
,
853 unsigned long *pheadroom
,
854 unsigned long *pdirty
,
855 unsigned long *pwriteback
)
859 #endif /* CONFIG_CGROUP_WRITEBACK */
862 bool mem_cgroup_charge_skmem(struct mem_cgroup
*memcg
, unsigned int nr_pages
);
863 void mem_cgroup_uncharge_skmem(struct mem_cgroup
*memcg
, unsigned int nr_pages
);
865 extern struct static_key_false memcg_sockets_enabled_key
;
866 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
867 void mem_cgroup_sk_alloc(struct sock
*sk
);
868 void mem_cgroup_sk_free(struct sock
*sk
);
869 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup
*memcg
)
871 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys
) && memcg
->tcpmem_pressure
)
874 if (time_before(jiffies
, memcg
->socket_pressure
))
876 } while ((memcg
= parent_mem_cgroup(memcg
)));
880 #define mem_cgroup_sockets_enabled 0
881 static inline void mem_cgroup_sk_alloc(struct sock
*sk
) { };
882 static inline void mem_cgroup_sk_free(struct sock
*sk
) { };
883 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup
*memcg
)
889 struct kmem_cache
*memcg_kmem_get_cache(struct kmem_cache
*cachep
);
890 void memcg_kmem_put_cache(struct kmem_cache
*cachep
);
891 int memcg_kmem_charge_memcg(struct page
*page
, gfp_t gfp
, int order
,
892 struct mem_cgroup
*memcg
);
893 int memcg_kmem_charge(struct page
*page
, gfp_t gfp
, int order
);
894 void memcg_kmem_uncharge(struct page
*page
, int order
);
896 #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
897 extern struct static_key_false memcg_kmem_enabled_key
;
898 extern struct workqueue_struct
*memcg_kmem_cache_wq
;
900 extern int memcg_nr_cache_ids
;
901 void memcg_get_cache_ids(void);
902 void memcg_put_cache_ids(void);
905 * Helper macro to loop through all memcg-specific caches. Callers must still
906 * check if the cache is valid (it is either valid or NULL).
907 * the slab_mutex must be held when looping through those caches
909 #define for_each_memcg_cache_index(_idx) \
910 for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++)
912 static inline bool memcg_kmem_enabled(void)
914 return static_branch_unlikely(&memcg_kmem_enabled_key
);
918 * helper for accessing a memcg's index. It will be used as an index in the
919 * child cache array in kmem_cache, and also to derive its name. This function
920 * will return -1 when this is not a kmem-limited memcg.
922 static inline int memcg_cache_id(struct mem_cgroup
*memcg
)
924 return memcg
? memcg
->kmemcg_id
: -1;
928 * memcg_kmem_update_page_stat - update kmem page state statistics
930 * @idx: page state item to account
931 * @val: number of pages (positive or negative)
933 static inline void memcg_kmem_update_page_stat(struct page
*page
,
934 enum mem_cgroup_stat_index idx
, int val
)
936 if (memcg_kmem_enabled() && page
->mem_cgroup
)
937 this_cpu_add(page
->mem_cgroup
->stat
->count
[idx
], val
);
941 #define for_each_memcg_cache_index(_idx) \
944 static inline bool memcg_kmem_enabled(void)
949 static inline int memcg_cache_id(struct mem_cgroup
*memcg
)
954 static inline void memcg_get_cache_ids(void)
958 static inline void memcg_put_cache_ids(void)
962 static inline void memcg_kmem_update_page_stat(struct page
*page
,
963 enum mem_cgroup_stat_index idx
, int val
)
966 #endif /* CONFIG_MEMCG && !CONFIG_SLOB */
968 #endif /* _LINUX_MEMCONTROL_H */