1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* memcontrol.h - Memory Controller
4 * Copyright IBM Corporation, 2007
5 * Author Balbir Singh <balbir@linux.vnet.ibm.com>
7 * Copyright 2007 OpenVZ SWsoft Inc
8 * Author: Pavel Emelianov <xemul@openvz.org>
11 #ifndef _LINUX_MEMCONTROL_H
12 #define _LINUX_MEMCONTROL_H
13 #include <linux/cgroup.h>
14 #include <linux/vm_event_item.h>
15 #include <linux/hardirq.h>
16 #include <linux/jump_label.h>
17 #include <linux/page_counter.h>
18 #include <linux/vmpressure.h>
19 #include <linux/eventfd.h>
21 #include <linux/vmstat.h>
22 #include <linux/writeback.h>
23 #include <linux/page-flags.h>
31 /* Cgroup-specific page state, on top of universal node page state */
32 enum memcg_stat_item {
33 MEMCG_SWAP = NR_VM_NODE_STAT_ITEMS,
43 enum memcg_memory_event {
53 MEMCG_NR_MEMORY_EVENTS,
56 struct mem_cgroup_reclaim_cookie {
58 unsigned int generation;
63 #define MEM_CGROUP_ID_SHIFT 16
64 #define MEM_CGROUP_ID_MAX USHRT_MAX
66 struct mem_cgroup_id {
72 * Per memcg event counter is incremented at every pagein/pageout. With THP,
73 * it will be incremented by the number of pages. This counter is used
74 * to trigger some periodic events. This is straightforward and better
75 * than using jiffies etc. to handle periodic memcg event.
77 enum mem_cgroup_events_target {
78 MEM_CGROUP_TARGET_THRESH,
79 MEM_CGROUP_TARGET_SOFTLIMIT,
83 struct memcg_vmstats_percpu {
84 /* Local (CPU and cgroup) page state & events */
85 long state[MEMCG_NR_STAT];
86 unsigned long events[NR_VM_EVENT_ITEMS];
88 /* Delta calculation for lockless upward propagation */
89 long state_prev[MEMCG_NR_STAT];
90 unsigned long events_prev[NR_VM_EVENT_ITEMS];
92 /* Cgroup1: threshold notifications & softlimit tree updates */
93 unsigned long nr_page_events;
94 unsigned long targets[MEM_CGROUP_NTARGETS];
97 struct memcg_vmstats {
98 /* Aggregated (CPU and subtree) page state & events */
99 long state[MEMCG_NR_STAT];
100 unsigned long events[NR_VM_EVENT_ITEMS];
102 /* Pending child counts during tree propagation */
103 long state_pending[MEMCG_NR_STAT];
104 unsigned long events_pending[NR_VM_EVENT_ITEMS];
107 struct mem_cgroup_reclaim_iter {
108 struct mem_cgroup *position;
109 /* scan generation, increased every round-trip */
110 unsigned int generation;
114 * Bitmap and deferred work of shrinker::id corresponding to memcg-aware
115 * shrinkers, which have elements charged to this memcg.
117 struct shrinker_info {
119 atomic_long_t *nr_deferred;
123 struct lruvec_stats_percpu {
124 /* Local (CPU and cgroup) state */
125 long state[NR_VM_NODE_STAT_ITEMS];
127 /* Delta calculation for lockless upward propagation */
128 long state_prev[NR_VM_NODE_STAT_ITEMS];
131 struct lruvec_stats {
132 /* Aggregated (CPU and subtree) state */
133 long state[NR_VM_NODE_STAT_ITEMS];
135 /* Pending child counts during tree propagation */
136 long state_pending[NR_VM_NODE_STAT_ITEMS];
140 * per-node information in memory controller.
142 struct mem_cgroup_per_node {
143 struct lruvec lruvec;
145 struct lruvec_stats_percpu __percpu *lruvec_stats_percpu;
146 struct lruvec_stats lruvec_stats;
148 unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];
150 struct mem_cgroup_reclaim_iter iter;
152 struct shrinker_info __rcu *shrinker_info;
154 struct rb_node tree_node; /* RB tree node */
155 unsigned long usage_in_excess;/* Set to the value by which */
156 /* the soft limit is exceeded*/
158 struct mem_cgroup *memcg; /* Back pointer, we cannot */
159 /* use container_of */
162 struct mem_cgroup_threshold {
163 struct eventfd_ctx *eventfd;
164 unsigned long threshold;
168 struct mem_cgroup_threshold_ary {
169 /* An array index points to threshold just below or equal to usage. */
170 int current_threshold;
171 /* Size of entries[] */
173 /* Array of thresholds */
174 struct mem_cgroup_threshold entries[];
177 struct mem_cgroup_thresholds {
178 /* Primary thresholds array */
179 struct mem_cgroup_threshold_ary *primary;
181 * Spare threshold array.
182 * This is needed to make mem_cgroup_unregister_event() "never fail".
183 * It must be able to store at least primary->size - 1 entries.
185 struct mem_cgroup_threshold_ary *spare;
188 #if defined(CONFIG_SMP)
189 struct memcg_padding {
191 } ____cacheline_internodealigned_in_smp;
192 #define MEMCG_PADDING(name) struct memcg_padding name
194 #define MEMCG_PADDING(name)
198 * Remember four most recent foreign writebacks with dirty pages in this
199 * cgroup. Inode sharing is expected to be uncommon and, even if we miss
200 * one in a given round, we're likely to catch it later if it keeps
201 * foreign-dirtying, so a fairly low count should be enough.
203 * See mem_cgroup_track_foreign_dirty_slowpath() for details.
205 #define MEMCG_CGWB_FRN_CNT 4
207 struct memcg_cgwb_frn {
208 u64 bdi_id; /* bdi->id of the foreign inode */
209 int memcg_id; /* memcg->css.id of foreign inode */
210 u64 at; /* jiffies_64 at the time of dirtying */
211 struct wb_completion done; /* tracks in-flight foreign writebacks */
215 * Bucket for arbitrarily byte-sized objects charged to a memory
216 * cgroup. The bucket can be reparented in one piece when the cgroup
217 * is destroyed, without having to round up the individual references
218 * of all live memory objects in the wild.
221 struct percpu_ref refcnt;
222 struct mem_cgroup *memcg;
223 atomic_t nr_charged_bytes;
225 struct list_head list; /* protected by objcg_lock */
231 * The memory controller data structure. The memory controller controls both
232 * page cache and RSS per cgroup. We would eventually like to provide
233 * statistics based on the statistics developed by Rik Van Riel for clock-pro,
234 * to help the administrator determine what knobs to tune.
237 struct cgroup_subsys_state css;
239 /* Private memcg ID. Used to ID objects that outlive the cgroup */
240 struct mem_cgroup_id id;
242 /* Accounted resources */
243 struct page_counter memory; /* Both v1 & v2 */
246 struct page_counter swap; /* v2 only */
247 struct page_counter memsw; /* v1 only */
250 /* Legacy consumer-oriented counters */
251 struct page_counter kmem; /* v1 only */
252 struct page_counter tcpmem; /* v1 only */
254 /* Range enforcement for interrupt charges */
255 struct work_struct high_work;
257 #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
258 unsigned long zswap_max;
261 unsigned long soft_limit;
263 /* vmpressure notifications */
264 struct vmpressure vmpressure;
267 * Should the OOM killer kill all belonging tasks, had it kill one?
271 /* protected by memcg_oom_lock */
276 /* OOM-Killer disable */
277 int oom_kill_disable;
279 /* memory.events and memory.events.local */
280 struct cgroup_file events_file;
281 struct cgroup_file events_local_file;
283 /* handle for "memory.swap.events" */
284 struct cgroup_file swap_events_file;
286 /* protect arrays of thresholds */
287 struct mutex thresholds_lock;
289 /* thresholds for memory usage. RCU-protected */
290 struct mem_cgroup_thresholds thresholds;
292 /* thresholds for mem+swap usage. RCU-protected */
293 struct mem_cgroup_thresholds memsw_thresholds;
295 /* For oom notifier event fd */
296 struct list_head oom_notify;
299 * Should we move charges of a task when a task is moved into this
300 * mem_cgroup ? And what type of charges should we move ?
302 unsigned long move_charge_at_immigrate;
303 /* taken only while moving_account > 0 */
304 spinlock_t move_lock;
305 unsigned long move_lock_flags;
307 MEMCG_PADDING(_pad1_);
310 struct memcg_vmstats vmstats;
313 atomic_long_t memory_events[MEMCG_NR_MEMORY_EVENTS];
314 atomic_long_t memory_events_local[MEMCG_NR_MEMORY_EVENTS];
316 unsigned long socket_pressure;
318 /* Legacy tcp memory accounting */
322 #ifdef CONFIG_MEMCG_KMEM
324 struct obj_cgroup __rcu *objcg;
325 /* list of inherited objcgs, protected by objcg_lock */
326 struct list_head objcg_list;
329 MEMCG_PADDING(_pad2_);
332 * set > 0 if pages under this cgroup are moving to other cgroup.
334 atomic_t moving_account;
335 struct task_struct *move_lock_task;
337 struct memcg_vmstats_percpu __percpu *vmstats_percpu;
339 #ifdef CONFIG_CGROUP_WRITEBACK
340 struct list_head cgwb_list;
341 struct wb_domain cgwb_domain;
342 struct memcg_cgwb_frn cgwb_frn[MEMCG_CGWB_FRN_CNT];
345 /* List of events which userspace want to receive */
346 struct list_head event_list;
347 spinlock_t event_list_lock;
349 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
350 struct deferred_split deferred_split_queue;
353 struct mem_cgroup_per_node *nodeinfo[];
357 * size of first charge trial. "32" comes from vmscan.c's magic value.
358 * TODO: maybe necessary to use big numbers in big irons.
360 #define MEMCG_CHARGE_BATCH 32U
362 extern struct mem_cgroup *root_mem_cgroup;
364 enum page_memcg_data_flags {
365 /* page->memcg_data is a pointer to an objcgs vector */
366 MEMCG_DATA_OBJCGS = (1UL << 0),
367 /* page has been accounted as a non-slab kernel page */
368 MEMCG_DATA_KMEM = (1UL << 1),
369 /* the next bit after the last actual flag */
370 __NR_MEMCG_DATA_FLAGS = (1UL << 2),
373 #define MEMCG_DATA_FLAGS_MASK (__NR_MEMCG_DATA_FLAGS - 1)
375 static inline bool folio_memcg_kmem(struct folio *folio);
378 * After the initialization objcg->memcg is always pointing at
379 * a valid memcg, but can be atomically swapped to the parent memcg.
381 * The caller must ensure that the returned memcg won't be released:
382 * e.g. acquire the rcu_read_lock or css_set_lock.
384 static inline struct mem_cgroup *obj_cgroup_memcg(struct obj_cgroup *objcg)
386 return READ_ONCE(objcg->memcg);
390 * __folio_memcg - Get the memory cgroup associated with a non-kmem folio
391 * @folio: Pointer to the folio.
393 * Returns a pointer to the memory cgroup associated with the folio,
394 * or NULL. This function assumes that the folio is known to have a
395 * proper memory cgroup pointer. It's not safe to call this function
396 * against some type of folios, e.g. slab folios or ex-slab folios or
399 static inline struct mem_cgroup *__folio_memcg(struct folio *folio)
401 unsigned long memcg_data = folio->memcg_data;
403 VM_BUG_ON_FOLIO(folio_test_slab(folio), folio);
404 VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJCGS, folio);
405 VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_KMEM, folio);
407 return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
411 * __folio_objcg - get the object cgroup associated with a kmem folio.
412 * @folio: Pointer to the folio.
414 * Returns a pointer to the object cgroup associated with the folio,
415 * or NULL. This function assumes that the folio is known to have a
416 * proper object cgroup pointer. It's not safe to call this function
417 * against some type of folios, e.g. slab folios or ex-slab folios or
420 static inline struct obj_cgroup *__folio_objcg(struct folio *folio)
422 unsigned long memcg_data = folio->memcg_data;
424 VM_BUG_ON_FOLIO(folio_test_slab(folio), folio);
425 VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJCGS, folio);
426 VM_BUG_ON_FOLIO(!(memcg_data & MEMCG_DATA_KMEM), folio);
428 return (struct obj_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
432 * folio_memcg - Get the memory cgroup associated with a folio.
433 * @folio: Pointer to the folio.
435 * Returns a pointer to the memory cgroup associated with the folio,
436 * or NULL. This function assumes that the folio is known to have a
437 * proper memory cgroup pointer. It's not safe to call this function
438 * against some type of folios, e.g. slab folios or ex-slab folios.
440 * For a non-kmem folio any of the following ensures folio and memcg binding
445 * - lock_page_memcg()
446 * - exclusive reference
448 * For a kmem folio a caller should hold an rcu read lock to protect memcg
449 * associated with a kmem folio from being released.
451 static inline struct mem_cgroup *folio_memcg(struct folio *folio)
453 if (folio_memcg_kmem(folio))
454 return obj_cgroup_memcg(__folio_objcg(folio));
455 return __folio_memcg(folio);
458 static inline struct mem_cgroup *page_memcg(struct page *page)
460 return folio_memcg(page_folio(page));
464 * folio_memcg_rcu - Locklessly get the memory cgroup associated with a folio.
465 * @folio: Pointer to the folio.
467 * This function assumes that the folio is known to have a
468 * proper memory cgroup pointer. It's not safe to call this function
469 * against some type of folios, e.g. slab folios or ex-slab folios.
471 * Return: A pointer to the memory cgroup associated with the folio,
474 static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio)
476 unsigned long memcg_data = READ_ONCE(folio->memcg_data);
478 VM_BUG_ON_FOLIO(folio_test_slab(folio), folio);
479 WARN_ON_ONCE(!rcu_read_lock_held());
481 if (memcg_data & MEMCG_DATA_KMEM) {
482 struct obj_cgroup *objcg;
484 objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
485 return obj_cgroup_memcg(objcg);
488 return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
492 * page_memcg_check - get the memory cgroup associated with a page
493 * @page: a pointer to the page struct
495 * Returns a pointer to the memory cgroup associated with the page,
496 * or NULL. This function unlike page_memcg() can take any page
497 * as an argument. It has to be used in cases when it's not known if a page
498 * has an associated memory cgroup pointer or an object cgroups vector or
501 * For a non-kmem page any of the following ensures page and memcg binding
506 * - lock_page_memcg()
507 * - exclusive reference
509 * For a kmem page a caller should hold an rcu read lock to protect memcg
510 * associated with a kmem page from being released.
512 static inline struct mem_cgroup *page_memcg_check(struct page *page)
515 * Because page->memcg_data might be changed asynchronously
516 * for slab pages, READ_ONCE() should be used here.
518 unsigned long memcg_data = READ_ONCE(page->memcg_data);
520 if (memcg_data & MEMCG_DATA_OBJCGS)
523 if (memcg_data & MEMCG_DATA_KMEM) {
524 struct obj_cgroup *objcg;
526 objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
527 return obj_cgroup_memcg(objcg);
530 return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
533 static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg)
535 struct mem_cgroup *memcg;
539 memcg = obj_cgroup_memcg(objcg);
540 if (unlikely(!css_tryget(&memcg->css)))
547 #ifdef CONFIG_MEMCG_KMEM
549 * folio_memcg_kmem - Check if the folio has the memcg_kmem flag set.
550 * @folio: Pointer to the folio.
552 * Checks if the folio has MemcgKmem flag set. The caller must ensure
553 * that the folio has an associated memory cgroup. It's not safe to call
554 * this function against some types of folios, e.g. slab folios.
556 static inline bool folio_memcg_kmem(struct folio *folio)
558 VM_BUG_ON_PGFLAGS(PageTail(&folio->page), &folio->page);
559 VM_BUG_ON_FOLIO(folio->memcg_data & MEMCG_DATA_OBJCGS, folio);
560 return folio->memcg_data & MEMCG_DATA_KMEM;
565 static inline bool folio_memcg_kmem(struct folio *folio)
572 static inline bool PageMemcgKmem(struct page *page)
574 return folio_memcg_kmem(page_folio(page));
577 static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
579 return (memcg == root_mem_cgroup);
582 static inline bool mem_cgroup_disabled(void)
584 return !cgroup_subsys_enabled(memory_cgrp_subsys);
587 static inline void mem_cgroup_protection(struct mem_cgroup *root,
588 struct mem_cgroup *memcg,
594 if (mem_cgroup_disabled())
598 * There is no reclaim protection applied to a targeted reclaim.
599 * We are special casing this specific case here because
600 * mem_cgroup_protected calculation is not robust enough to keep
601 * the protection invariant for calculated effective values for
602 * parallel reclaimers with different reclaim target. This is
603 * especially a problem for tail memcgs (as they have pages on LRU)
604 * which would want to have effective values 0 for targeted reclaim
605 * but a different value for external reclaim.
608 * Let's have global and A's reclaim in parallel:
610 * A (low=2G, usage = 3G, max = 3G, children_low_usage = 1.5G)
612 * | C (low = 1G, usage = 2.5G)
613 * B (low = 1G, usage = 0.5G)
615 * For the global reclaim
617 * B.elow = min(B.usage, B.low) because children_low_usage <= A.elow
618 * C.elow = min(C.usage, C.low)
620 * With the effective values resetting we have A reclaim
625 * If the global reclaim races with A's reclaim then
626 * B.elow = C.elow = 0 because children_low_usage > A.elow)
627 * is possible and reclaiming B would be violating the protection.
633 *min = READ_ONCE(memcg->memory.emin);
634 *low = READ_ONCE(memcg->memory.elow);
637 void mem_cgroup_calculate_protection(struct mem_cgroup *root,
638 struct mem_cgroup *memcg);
640 static inline bool mem_cgroup_supports_protection(struct mem_cgroup *memcg)
643 * The root memcg doesn't account charges, and doesn't support
646 return !mem_cgroup_disabled() && !mem_cgroup_is_root(memcg);
650 static inline bool mem_cgroup_below_low(struct mem_cgroup *memcg)
652 if (!mem_cgroup_supports_protection(memcg))
655 return READ_ONCE(memcg->memory.elow) >=
656 page_counter_read(&memcg->memory);
659 static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
661 if (!mem_cgroup_supports_protection(memcg))
664 return READ_ONCE(memcg->memory.emin) >=
665 page_counter_read(&memcg->memory);
668 int __mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp);
671 * mem_cgroup_charge - Charge a newly allocated folio to a cgroup.
672 * @folio: Folio to charge.
673 * @mm: mm context of the allocating task.
674 * @gfp: Reclaim mode.
676 * Try to charge @folio to the memcg that @mm belongs to, reclaiming
677 * pages according to @gfp if necessary. If @mm is NULL, try to
678 * charge to the active memcg.
680 * Do not use this for folios allocated for swapin.
682 * Return: 0 on success. Otherwise, an error code is returned.
684 static inline int mem_cgroup_charge(struct folio *folio, struct mm_struct *mm,
687 if (mem_cgroup_disabled())
689 return __mem_cgroup_charge(folio, mm, gfp);
692 int mem_cgroup_swapin_charge_page(struct page *page, struct mm_struct *mm,
693 gfp_t gfp, swp_entry_t entry);
694 void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry);
696 void __mem_cgroup_uncharge(struct folio *folio);
699 * mem_cgroup_uncharge - Uncharge a folio.
700 * @folio: Folio to uncharge.
702 * Uncharge a folio previously charged with mem_cgroup_charge().
704 static inline void mem_cgroup_uncharge(struct folio *folio)
706 if (mem_cgroup_disabled())
708 __mem_cgroup_uncharge(folio);
711 void __mem_cgroup_uncharge_list(struct list_head *page_list);
712 static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
714 if (mem_cgroup_disabled())
716 __mem_cgroup_uncharge_list(page_list);
719 void mem_cgroup_migrate(struct folio *old, struct folio *new);
722 * mem_cgroup_lruvec - get the lru list vector for a memcg & node
723 * @memcg: memcg of the wanted lruvec
724 * @pgdat: pglist_data
726 * Returns the lru list vector holding pages for a given @memcg &
727 * @pgdat combination. This can be the node lruvec, if the memory
728 * controller is disabled.
730 static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
731 struct pglist_data *pgdat)
733 struct mem_cgroup_per_node *mz;
734 struct lruvec *lruvec;
736 if (mem_cgroup_disabled()) {
737 lruvec = &pgdat->__lruvec;
742 memcg = root_mem_cgroup;
744 mz = memcg->nodeinfo[pgdat->node_id];
745 lruvec = &mz->lruvec;
748 * Since a node can be onlined after the mem_cgroup was created,
749 * we have to be prepared to initialize lruvec->pgdat here;
750 * and if offlined then reonlined, we need to reinitialize it.
752 if (unlikely(lruvec->pgdat != pgdat))
753 lruvec->pgdat = pgdat;
758 * folio_lruvec - return lruvec for isolating/putting an LRU folio
759 * @folio: Pointer to the folio.
761 * This function relies on folio->mem_cgroup being stable.
763 static inline struct lruvec *folio_lruvec(struct folio *folio)
765 struct mem_cgroup *memcg = folio_memcg(folio);
767 VM_WARN_ON_ONCE_FOLIO(!memcg && !mem_cgroup_disabled(), folio);
768 return mem_cgroup_lruvec(memcg, folio_pgdat(folio));
771 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
773 struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm);
775 struct lruvec *folio_lruvec_lock(struct folio *folio);
776 struct lruvec *folio_lruvec_lock_irq(struct folio *folio);
777 struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio,
778 unsigned long *flags);
780 #ifdef CONFIG_DEBUG_VM
781 void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio);
784 void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio)
790 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
791 return css ? container_of(css, struct mem_cgroup, css) : NULL;
794 static inline bool obj_cgroup_tryget(struct obj_cgroup *objcg)
796 return percpu_ref_tryget(&objcg->refcnt);
799 static inline void obj_cgroup_get(struct obj_cgroup *objcg)
801 percpu_ref_get(&objcg->refcnt);
804 static inline void obj_cgroup_get_many(struct obj_cgroup *objcg,
807 percpu_ref_get_many(&objcg->refcnt, nr);
810 static inline void obj_cgroup_put(struct obj_cgroup *objcg)
812 percpu_ref_put(&objcg->refcnt);
815 static inline void mem_cgroup_put(struct mem_cgroup *memcg)
818 css_put(&memcg->css);
821 #define mem_cgroup_from_counter(counter, member) \
822 container_of(counter, struct mem_cgroup, member)
824 struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
826 struct mem_cgroup_reclaim_cookie *);
827 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
828 int mem_cgroup_scan_tasks(struct mem_cgroup *,
829 int (*)(struct task_struct *, void *), void *);
831 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
833 if (mem_cgroup_disabled())
838 struct mem_cgroup *mem_cgroup_from_id(unsigned short id);
840 #ifdef CONFIG_SHRINKER_DEBUG
841 static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg)
843 return memcg ? cgroup_ino(memcg->css.cgroup) : 0;
846 struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino);
849 static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
851 return mem_cgroup_from_css(seq_css(m));
854 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
856 struct mem_cgroup_per_node *mz;
858 if (mem_cgroup_disabled())
861 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
866 * parent_mem_cgroup - find the accounting parent of a memcg
867 * @memcg: memcg whose parent to find
869 * Returns the parent memcg, or NULL if this is the root or the memory
870 * controller is in legacy no-hierarchy mode.
872 static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
874 return mem_cgroup_from_css(memcg->css.parent);
877 static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
878 struct mem_cgroup *root)
882 return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
885 static inline bool mm_match_cgroup(struct mm_struct *mm,
886 struct mem_cgroup *memcg)
888 struct mem_cgroup *task_memcg;
892 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
894 match = mem_cgroup_is_descendant(task_memcg, memcg);
899 struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page);
900 ino_t page_cgroup_ino(struct page *page);
902 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
904 if (mem_cgroup_disabled())
906 return !!(memcg->css.flags & CSS_ONLINE);
909 void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
910 int zid, int nr_pages);
913 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
914 enum lru_list lru, int zone_idx)
916 struct mem_cgroup_per_node *mz;
918 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
919 return READ_ONCE(mz->lru_zone_size[zone_idx][lru]);
922 void mem_cgroup_handle_over_high(void);
924 unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg);
926 unsigned long mem_cgroup_size(struct mem_cgroup *memcg);
928 void mem_cgroup_print_oom_context(struct mem_cgroup *memcg,
929 struct task_struct *p);
931 void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg);
933 static inline void mem_cgroup_enter_user_fault(void)
935 WARN_ON(current->in_user_fault);
936 current->in_user_fault = 1;
939 static inline void mem_cgroup_exit_user_fault(void)
941 WARN_ON(!current->in_user_fault);
942 current->in_user_fault = 0;
945 static inline bool task_in_memcg_oom(struct task_struct *p)
947 return p->memcg_in_oom;
950 bool mem_cgroup_oom_synchronize(bool wait);
951 struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim,
952 struct mem_cgroup *oom_domain);
953 void mem_cgroup_print_oom_group(struct mem_cgroup *memcg);
955 void folio_memcg_lock(struct folio *folio);
956 void folio_memcg_unlock(struct folio *folio);
957 void lock_page_memcg(struct page *page);
958 void unlock_page_memcg(struct page *page);
960 void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val);
962 /* idx can be of type enum memcg_stat_item or node_stat_item */
963 static inline void mod_memcg_state(struct mem_cgroup *memcg,
968 local_irq_save(flags);
969 __mod_memcg_state(memcg, idx, val);
970 local_irq_restore(flags);
973 static inline void mod_memcg_page_state(struct page *page,
976 struct mem_cgroup *memcg;
978 if (mem_cgroup_disabled())
982 memcg = page_memcg(page);
984 mod_memcg_state(memcg, idx, val);
988 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
990 long x = READ_ONCE(memcg->vmstats.state[idx]);
998 static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
999 enum node_stat_item idx)
1001 struct mem_cgroup_per_node *pn;
1004 if (mem_cgroup_disabled())
1005 return node_page_state(lruvec_pgdat(lruvec), idx);
1007 pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
1008 x = READ_ONCE(pn->lruvec_stats.state[idx]);
1016 static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec,
1017 enum node_stat_item idx)
1019 struct mem_cgroup_per_node *pn;
1023 if (mem_cgroup_disabled())
1024 return node_page_state(lruvec_pgdat(lruvec), idx);
1026 pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
1027 for_each_possible_cpu(cpu)
1028 x += per_cpu(pn->lruvec_stats_percpu->state[idx], cpu);
1036 void mem_cgroup_flush_stats(void);
1037 void mem_cgroup_flush_stats_delayed(void);
1039 void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
1041 void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val);
1043 static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
1046 unsigned long flags;
1048 local_irq_save(flags);
1049 __mod_lruvec_kmem_state(p, idx, val);
1050 local_irq_restore(flags);
1053 static inline void mod_memcg_lruvec_state(struct lruvec *lruvec,
1054 enum node_stat_item idx, int val)
1056 unsigned long flags;
1058 local_irq_save(flags);
1059 __mod_memcg_lruvec_state(lruvec, idx, val);
1060 local_irq_restore(flags);
1063 void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
1064 unsigned long count);
1066 static inline void count_memcg_events(struct mem_cgroup *memcg,
1067 enum vm_event_item idx,
1068 unsigned long count)
1070 unsigned long flags;
1072 local_irq_save(flags);
1073 __count_memcg_events(memcg, idx, count);
1074 local_irq_restore(flags);
1077 static inline void count_memcg_page_event(struct page *page,
1078 enum vm_event_item idx)
1080 struct mem_cgroup *memcg = page_memcg(page);
1083 count_memcg_events(memcg, idx, 1);
1086 static inline void count_memcg_folio_events(struct folio *folio,
1087 enum vm_event_item idx, unsigned long nr)
1089 struct mem_cgroup *memcg = folio_memcg(folio);
1092 count_memcg_events(memcg, idx, nr);
1095 static inline void count_memcg_event_mm(struct mm_struct *mm,
1096 enum vm_event_item idx)
1098 struct mem_cgroup *memcg;
1100 if (mem_cgroup_disabled())
1104 memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
1106 count_memcg_events(memcg, idx, 1);
1110 static inline void memcg_memory_event(struct mem_cgroup *memcg,
1111 enum memcg_memory_event event)
1113 bool swap_event = event == MEMCG_SWAP_HIGH || event == MEMCG_SWAP_MAX ||
1114 event == MEMCG_SWAP_FAIL;
1116 atomic_long_inc(&memcg->memory_events_local[event]);
1118 cgroup_file_notify(&memcg->events_local_file);
1121 atomic_long_inc(&memcg->memory_events[event]);
1123 cgroup_file_notify(&memcg->swap_events_file);
1125 cgroup_file_notify(&memcg->events_file);
1127 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
1129 if (cgrp_dfl_root.flags & CGRP_ROOT_MEMORY_LOCAL_EVENTS)
1131 } while ((memcg = parent_mem_cgroup(memcg)) &&
1132 !mem_cgroup_is_root(memcg));
1135 static inline void memcg_memory_event_mm(struct mm_struct *mm,
1136 enum memcg_memory_event event)
1138 struct mem_cgroup *memcg;
1140 if (mem_cgroup_disabled())
1144 memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
1146 memcg_memory_event(memcg, event);
1150 void split_page_memcg(struct page *head, unsigned int nr);
1152 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
1154 unsigned long *total_scanned);
1156 #else /* CONFIG_MEMCG */
1158 #define MEM_CGROUP_ID_SHIFT 0
1159 #define MEM_CGROUP_ID_MAX 0
1161 static inline struct mem_cgroup *folio_memcg(struct folio *folio)
1166 static inline struct mem_cgroup *page_memcg(struct page *page)
1171 static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio)
1173 WARN_ON_ONCE(!rcu_read_lock_held());
1177 static inline struct mem_cgroup *page_memcg_check(struct page *page)
1182 static inline bool folio_memcg_kmem(struct folio *folio)
1187 static inline bool PageMemcgKmem(struct page *page)
1192 static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
1197 static inline bool mem_cgroup_disabled(void)
1202 static inline void memcg_memory_event(struct mem_cgroup *memcg,
1203 enum memcg_memory_event event)
1207 static inline void memcg_memory_event_mm(struct mm_struct *mm,
1208 enum memcg_memory_event event)
1212 static inline void mem_cgroup_protection(struct mem_cgroup *root,
1213 struct mem_cgroup *memcg,
1220 static inline void mem_cgroup_calculate_protection(struct mem_cgroup *root,
1221 struct mem_cgroup *memcg)
1225 static inline bool mem_cgroup_below_low(struct mem_cgroup *memcg)
1230 static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
1235 static inline int mem_cgroup_charge(struct folio *folio,
1236 struct mm_struct *mm, gfp_t gfp)
1241 static inline int mem_cgroup_swapin_charge_page(struct page *page,
1242 struct mm_struct *mm, gfp_t gfp, swp_entry_t entry)
1247 static inline void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry)
1251 static inline void mem_cgroup_uncharge(struct folio *folio)
1255 static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
1259 static inline void mem_cgroup_migrate(struct folio *old, struct folio *new)
1263 static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
1264 struct pglist_data *pgdat)
1266 return &pgdat->__lruvec;
1269 static inline struct lruvec *folio_lruvec(struct folio *folio)
1271 struct pglist_data *pgdat = folio_pgdat(folio);
1272 return &pgdat->__lruvec;
1276 void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio)
1280 static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
1285 static inline bool mm_match_cgroup(struct mm_struct *mm,
1286 struct mem_cgroup *memcg)
1291 static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
1297 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css)
1302 static inline void obj_cgroup_put(struct obj_cgroup *objcg)
1306 static inline void mem_cgroup_put(struct mem_cgroup *memcg)
1310 static inline struct lruvec *folio_lruvec_lock(struct folio *folio)
1312 struct pglist_data *pgdat = folio_pgdat(folio);
1314 spin_lock(&pgdat->__lruvec.lru_lock);
1315 return &pgdat->__lruvec;
1318 static inline struct lruvec *folio_lruvec_lock_irq(struct folio *folio)
1320 struct pglist_data *pgdat = folio_pgdat(folio);
1322 spin_lock_irq(&pgdat->__lruvec.lru_lock);
1323 return &pgdat->__lruvec;
1326 static inline struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio,
1327 unsigned long *flagsp)
1329 struct pglist_data *pgdat = folio_pgdat(folio);
1331 spin_lock_irqsave(&pgdat->__lruvec.lru_lock, *flagsp);
1332 return &pgdat->__lruvec;
1335 static inline struct mem_cgroup *
1336 mem_cgroup_iter(struct mem_cgroup *root,
1337 struct mem_cgroup *prev,
1338 struct mem_cgroup_reclaim_cookie *reclaim)
1343 static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
1344 struct mem_cgroup *prev)
1348 static inline int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
1349 int (*fn)(struct task_struct *, void *), void *arg)
1354 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
1359 static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
1362 /* XXX: This should always return root_mem_cgroup */
1366 #ifdef CONFIG_SHRINKER_DEBUG
1367 static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg)
1372 static inline struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
1378 static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
1383 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
1388 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
1394 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
1395 enum lru_list lru, int zone_idx)
1400 static inline unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg)
1405 static inline unsigned long mem_cgroup_size(struct mem_cgroup *memcg)
1411 mem_cgroup_print_oom_context(struct mem_cgroup *memcg, struct task_struct *p)
1416 mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg)
1420 static inline void lock_page_memcg(struct page *page)
1424 static inline void unlock_page_memcg(struct page *page)
1428 static inline void folio_memcg_lock(struct folio *folio)
1432 static inline void folio_memcg_unlock(struct folio *folio)
1436 static inline void mem_cgroup_handle_over_high(void)
1440 static inline void mem_cgroup_enter_user_fault(void)
1444 static inline void mem_cgroup_exit_user_fault(void)
1448 static inline bool task_in_memcg_oom(struct task_struct *p)
1453 static inline bool mem_cgroup_oom_synchronize(bool wait)
1458 static inline struct mem_cgroup *mem_cgroup_get_oom_group(
1459 struct task_struct *victim, struct mem_cgroup *oom_domain)
1464 static inline void mem_cgroup_print_oom_group(struct mem_cgroup *memcg)
1468 static inline void __mod_memcg_state(struct mem_cgroup *memcg,
1474 static inline void mod_memcg_state(struct mem_cgroup *memcg,
1480 static inline void mod_memcg_page_state(struct page *page,
1485 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
1490 static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
1491 enum node_stat_item idx)
1493 return node_page_state(lruvec_pgdat(lruvec), idx);
1496 static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec,
1497 enum node_stat_item idx)
1499 return node_page_state(lruvec_pgdat(lruvec), idx);
1502 static inline void mem_cgroup_flush_stats(void)
1506 static inline void mem_cgroup_flush_stats_delayed(void)
1510 static inline void __mod_memcg_lruvec_state(struct lruvec *lruvec,
1511 enum node_stat_item idx, int val)
1515 static inline void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
1518 struct page *page = virt_to_head_page(p);
1520 __mod_node_page_state(page_pgdat(page), idx, val);
1523 static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
1526 struct page *page = virt_to_head_page(p);
1528 mod_node_page_state(page_pgdat(page), idx, val);
1531 static inline void count_memcg_events(struct mem_cgroup *memcg,
1532 enum vm_event_item idx,
1533 unsigned long count)
1537 static inline void __count_memcg_events(struct mem_cgroup *memcg,
1538 enum vm_event_item idx,
1539 unsigned long count)
1543 static inline void count_memcg_page_event(struct page *page,
1548 static inline void count_memcg_folio_events(struct folio *folio,
1549 enum vm_event_item idx, unsigned long nr)
1554 void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx)
1558 static inline void split_page_memcg(struct page *head, unsigned int nr)
1563 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
1565 unsigned long *total_scanned)
1569 #endif /* CONFIG_MEMCG */
1571 static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx)
1573 __mod_lruvec_kmem_state(p, idx, 1);
1576 static inline void __dec_lruvec_kmem_state(void *p, enum node_stat_item idx)
1578 __mod_lruvec_kmem_state(p, idx, -1);
1581 static inline struct lruvec *parent_lruvec(struct lruvec *lruvec)
1583 struct mem_cgroup *memcg;
1585 memcg = lruvec_memcg(lruvec);
1588 memcg = parent_mem_cgroup(memcg);
1591 return mem_cgroup_lruvec(memcg, lruvec_pgdat(lruvec));
1594 static inline void unlock_page_lruvec(struct lruvec *lruvec)
1596 spin_unlock(&lruvec->lru_lock);
1599 static inline void unlock_page_lruvec_irq(struct lruvec *lruvec)
1601 spin_unlock_irq(&lruvec->lru_lock);
1604 static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec,
1605 unsigned long flags)
1607 spin_unlock_irqrestore(&lruvec->lru_lock, flags);
1610 /* Test requires a stable page->memcg binding, see page_memcg() */
1611 static inline bool folio_matches_lruvec(struct folio *folio,
1612 struct lruvec *lruvec)
1614 return lruvec_pgdat(lruvec) == folio_pgdat(folio) &&
1615 lruvec_memcg(lruvec) == folio_memcg(folio);
1618 /* Don't lock again iff page's lruvec locked */
1619 static inline struct lruvec *folio_lruvec_relock_irq(struct folio *folio,
1620 struct lruvec *locked_lruvec)
1622 if (locked_lruvec) {
1623 if (folio_matches_lruvec(folio, locked_lruvec))
1624 return locked_lruvec;
1626 unlock_page_lruvec_irq(locked_lruvec);
1629 return folio_lruvec_lock_irq(folio);
1632 /* Don't lock again iff page's lruvec locked */
1633 static inline struct lruvec *folio_lruvec_relock_irqsave(struct folio *folio,
1634 struct lruvec *locked_lruvec, unsigned long *flags)
1636 if (locked_lruvec) {
1637 if (folio_matches_lruvec(folio, locked_lruvec))
1638 return locked_lruvec;
1640 unlock_page_lruvec_irqrestore(locked_lruvec, *flags);
1643 return folio_lruvec_lock_irqsave(folio, flags);
1646 #ifdef CONFIG_CGROUP_WRITEBACK
1648 struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
1649 void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
1650 unsigned long *pheadroom, unsigned long *pdirty,
1651 unsigned long *pwriteback);
1653 void mem_cgroup_track_foreign_dirty_slowpath(struct folio *folio,
1654 struct bdi_writeback *wb);
1656 static inline void mem_cgroup_track_foreign_dirty(struct folio *folio,
1657 struct bdi_writeback *wb)
1659 if (mem_cgroup_disabled())
1662 if (unlikely(&folio_memcg(folio)->css != wb->memcg_css))
1663 mem_cgroup_track_foreign_dirty_slowpath(folio, wb);
1666 void mem_cgroup_flush_foreign(struct bdi_writeback *wb);
1668 #else /* CONFIG_CGROUP_WRITEBACK */
1670 static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb)
1675 static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
1676 unsigned long *pfilepages,
1677 unsigned long *pheadroom,
1678 unsigned long *pdirty,
1679 unsigned long *pwriteback)
1683 static inline void mem_cgroup_track_foreign_dirty(struct folio *folio,
1684 struct bdi_writeback *wb)
1688 static inline void mem_cgroup_flush_foreign(struct bdi_writeback *wb)
1692 #endif /* CONFIG_CGROUP_WRITEBACK */
1695 bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
1697 void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
1699 extern struct static_key_false memcg_sockets_enabled_key;
1700 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
1701 void mem_cgroup_sk_alloc(struct sock *sk);
1702 void mem_cgroup_sk_free(struct sock *sk);
1703 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
1705 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure)
1708 if (time_before(jiffies, READ_ONCE(memcg->socket_pressure)))
1710 } while ((memcg = parent_mem_cgroup(memcg)));
1714 int alloc_shrinker_info(struct mem_cgroup *memcg);
1715 void free_shrinker_info(struct mem_cgroup *memcg);
1716 void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id);
1717 void reparent_shrinker_deferred(struct mem_cgroup *memcg);
1719 #define mem_cgroup_sockets_enabled 0
1720 static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
1721 static inline void mem_cgroup_sk_free(struct sock *sk) { };
1722 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
1727 static inline void set_shrinker_bit(struct mem_cgroup *memcg,
1728 int nid, int shrinker_id)
1733 #ifdef CONFIG_MEMCG_KMEM
1734 bool mem_cgroup_kmem_disabled(void);
1735 int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order);
1736 void __memcg_kmem_uncharge_page(struct page *page, int order);
1738 struct obj_cgroup *get_obj_cgroup_from_current(void);
1739 struct obj_cgroup *get_obj_cgroup_from_page(struct page *page);
1741 int obj_cgroup_charge(struct obj_cgroup *objcg, gfp_t gfp, size_t size);
1742 void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size);
1744 extern struct static_key_false memcg_kmem_enabled_key;
1746 static inline bool memcg_kmem_enabled(void)
1748 return static_branch_likely(&memcg_kmem_enabled_key);
1751 static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
1754 if (memcg_kmem_enabled())
1755 return __memcg_kmem_charge_page(page, gfp, order);
1759 static inline void memcg_kmem_uncharge_page(struct page *page, int order)
1761 if (memcg_kmem_enabled())
1762 __memcg_kmem_uncharge_page(page, order);
1766 * A helper for accessing memcg's kmem_id, used for getting
1767 * corresponding LRU lists.
1769 static inline int memcg_kmem_id(struct mem_cgroup *memcg)
1771 return memcg ? memcg->kmemcg_id : -1;
1774 struct mem_cgroup *mem_cgroup_from_obj(void *p);
1775 struct mem_cgroup *mem_cgroup_from_slab_obj(void *p);
1777 static inline void count_objcg_event(struct obj_cgroup *objcg,
1778 enum vm_event_item idx)
1780 struct mem_cgroup *memcg;
1782 if (mem_cgroup_kmem_disabled())
1786 memcg = obj_cgroup_memcg(objcg);
1787 count_memcg_events(memcg, idx, 1);
1792 * get_mem_cgroup_from_obj - get a memcg associated with passed kernel object.
1793 * @p: pointer to object from which memcg should be extracted. It can be NULL.
1795 * Retrieves the memory group into which the memory of the pointed kernel
1796 * object is accounted. If memcg is found, its reference is taken.
1797 * If a passed kernel object is uncharged, or if proper memcg cannot be found,
1798 * as well as if mem_cgroup is disabled, NULL is returned.
1800 * Return: valid memcg pointer with taken reference or NULL.
1802 static inline struct mem_cgroup *get_mem_cgroup_from_obj(void *p)
1804 struct mem_cgroup *memcg;
1808 memcg = mem_cgroup_from_obj(p);
1809 } while (memcg && !css_tryget(&memcg->css));
1815 * mem_cgroup_or_root - always returns a pointer to a valid memory cgroup.
1816 * @memcg: pointer to a valid memory cgroup or NULL.
1818 * If passed argument is not NULL, returns it without any additional checks
1819 * and changes. Otherwise, root_mem_cgroup is returned.
1821 * NOTE: root_mem_cgroup can be NULL during early boot.
1823 static inline struct mem_cgroup *mem_cgroup_or_root(struct mem_cgroup *memcg)
1825 return memcg ? memcg : root_mem_cgroup;
1828 static inline bool mem_cgroup_kmem_disabled(void)
1833 static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
1839 static inline void memcg_kmem_uncharge_page(struct page *page, int order)
1843 static inline int __memcg_kmem_charge_page(struct page *page, gfp_t gfp,
1849 static inline void __memcg_kmem_uncharge_page(struct page *page, int order)
1853 static inline struct obj_cgroup *get_obj_cgroup_from_page(struct page *page)
1858 static inline bool memcg_kmem_enabled(void)
1863 static inline int memcg_kmem_id(struct mem_cgroup *memcg)
1868 static inline struct mem_cgroup *mem_cgroup_from_obj(void *p)
1873 static inline struct mem_cgroup *mem_cgroup_from_slab_obj(void *p)
1878 static inline void count_objcg_event(struct obj_cgroup *objcg,
1879 enum vm_event_item idx)
1883 static inline struct mem_cgroup *get_mem_cgroup_from_obj(void *p)
1888 static inline struct mem_cgroup *mem_cgroup_or_root(struct mem_cgroup *memcg)
1892 #endif /* CONFIG_MEMCG_KMEM */
1894 #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
1895 bool obj_cgroup_may_zswap(struct obj_cgroup *objcg);
1896 void obj_cgroup_charge_zswap(struct obj_cgroup *objcg, size_t size);
1897 void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg, size_t size);
1899 static inline bool obj_cgroup_may_zswap(struct obj_cgroup *objcg)
1903 static inline void obj_cgroup_charge_zswap(struct obj_cgroup *objcg,
1907 static inline void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg,
1913 #endif /* _LINUX_MEMCONTROL_H */