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/kernel.h>
18 #include <linux/page_counter.h>
19 #include <linux/vmpressure.h>
20 #include <linux/eventfd.h>
22 #include <linux/vmstat.h>
23 #include <linux/writeback.h>
24 #include <linux/page-flags.h>
25 #include <linux/shrinker.h>
33 /* Cgroup-specific page state, on top of universal node page state */
34 enum memcg_stat_item {
35 MEMCG_SWAP = NR_VM_NODE_STAT_ITEMS,
45 enum memcg_memory_event {
55 MEMCG_NR_MEMORY_EVENTS,
58 struct mem_cgroup_reclaim_cookie {
60 unsigned int generation;
65 #define MEM_CGROUP_ID_SHIFT 16
67 struct mem_cgroup_id {
73 * Per memcg event counter is incremented at every pagein/pageout. With THP,
74 * it will be incremented by the number of pages. This counter is used
75 * to trigger some periodic events. This is straightforward and better
76 * than using jiffies etc. to handle periodic memcg event.
78 enum mem_cgroup_events_target {
79 MEM_CGROUP_TARGET_THRESH,
80 MEM_CGROUP_TARGET_SOFTLIMIT,
84 struct memcg_vmstats_percpu;
87 struct mem_cgroup_reclaim_iter {
88 struct mem_cgroup *position;
89 /* scan generation, increased every round-trip */
90 unsigned int generation;
93 struct lruvec_stats_percpu {
94 /* Local (CPU and cgroup) state */
95 long state[NR_VM_NODE_STAT_ITEMS];
97 /* Delta calculation for lockless upward propagation */
98 long state_prev[NR_VM_NODE_STAT_ITEMS];
101 struct lruvec_stats {
102 /* Aggregated (CPU and subtree) state */
103 long state[NR_VM_NODE_STAT_ITEMS];
105 /* Non-hierarchical (CPU aggregated) state */
106 long state_local[NR_VM_NODE_STAT_ITEMS];
108 /* Pending child counts during tree propagation */
109 long state_pending[NR_VM_NODE_STAT_ITEMS];
113 * per-node information in memory controller.
115 struct mem_cgroup_per_node {
116 struct lruvec lruvec;
118 struct lruvec_stats_percpu __percpu *lruvec_stats_percpu;
119 struct lruvec_stats lruvec_stats;
121 unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];
123 struct mem_cgroup_reclaim_iter iter;
125 struct shrinker_info __rcu *shrinker_info;
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[] __counted_by(size);
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;
162 * Remember four most recent foreign writebacks with dirty pages in this
163 * cgroup. Inode sharing is expected to be uncommon and, even if we miss
164 * one in a given round, we're likely to catch it later if it keeps
165 * foreign-dirtying, so a fairly low count should be enough.
167 * See mem_cgroup_track_foreign_dirty_slowpath() for details.
169 #define MEMCG_CGWB_FRN_CNT 4
171 struct memcg_cgwb_frn {
172 u64 bdi_id; /* bdi->id of the foreign inode */
173 int memcg_id; /* memcg->css.id of foreign inode */
174 u64 at; /* jiffies_64 at the time of dirtying */
175 struct wb_completion done; /* tracks in-flight foreign writebacks */
179 * Bucket for arbitrarily byte-sized objects charged to a memory
180 * cgroup. The bucket can be reparented in one piece when the cgroup
181 * is destroyed, without having to round up the individual references
182 * of all live memory objects in the wild.
185 struct percpu_ref refcnt;
186 struct mem_cgroup *memcg;
187 atomic_t nr_charged_bytes;
189 struct list_head list; /* protected by objcg_lock */
195 * The memory controller data structure. The memory controller controls both
196 * page cache and RSS per cgroup. We would eventually like to provide
197 * statistics based on the statistics developed by Rik Van Riel for clock-pro,
198 * to help the administrator determine what knobs to tune.
201 struct cgroup_subsys_state css;
203 /* Private memcg ID. Used to ID objects that outlive the cgroup */
204 struct mem_cgroup_id id;
206 /* Accounted resources */
207 struct page_counter memory; /* Both v1 & v2 */
210 struct page_counter swap; /* v2 only */
211 struct page_counter memsw; /* v1 only */
214 /* Legacy consumer-oriented counters */
215 struct page_counter kmem; /* v1 only */
216 struct page_counter tcpmem; /* v1 only */
218 /* Range enforcement for interrupt charges */
219 struct work_struct high_work;
221 #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
222 unsigned long zswap_max;
225 * Prevent pages from this memcg from being written back from zswap to
226 * swap, and from being swapped out on zswap store failures.
228 bool zswap_writeback;
231 unsigned long soft_limit;
233 /* vmpressure notifications */
234 struct vmpressure vmpressure;
237 * Should the OOM killer kill all belonging tasks, had it kill one?
241 /* protected by memcg_oom_lock */
246 /* OOM-Killer disable */
247 int oom_kill_disable;
249 /* memory.events and memory.events.local */
250 struct cgroup_file events_file;
251 struct cgroup_file events_local_file;
253 /* handle for "memory.swap.events" */
254 struct cgroup_file swap_events_file;
256 /* protect arrays of thresholds */
257 struct mutex thresholds_lock;
259 /* thresholds for memory usage. RCU-protected */
260 struct mem_cgroup_thresholds thresholds;
262 /* thresholds for mem+swap usage. RCU-protected */
263 struct mem_cgroup_thresholds memsw_thresholds;
265 /* For oom notifier event fd */
266 struct list_head oom_notify;
269 * Should we move charges of a task when a task is moved into this
270 * mem_cgroup ? And what type of charges should we move ?
272 unsigned long move_charge_at_immigrate;
273 /* taken only while moving_account > 0 */
274 spinlock_t move_lock;
275 unsigned long move_lock_flags;
277 CACHELINE_PADDING(_pad1_);
280 struct memcg_vmstats *vmstats;
283 atomic_long_t memory_events[MEMCG_NR_MEMORY_EVENTS];
284 atomic_long_t memory_events_local[MEMCG_NR_MEMORY_EVENTS];
287 * Hint of reclaim pressure for socket memroy management. Note
288 * that this indicator should NOT be used in legacy cgroup mode
289 * where socket memory is accounted/charged separately.
291 unsigned long socket_pressure;
293 /* Legacy tcp memory accounting */
297 #ifdef CONFIG_MEMCG_KMEM
300 * memcg->objcg is wiped out as a part of the objcg repaprenting
301 * process. memcg->orig_objcg preserves a pointer (and a reference)
302 * to the original objcg until the end of live of memcg.
304 struct obj_cgroup __rcu *objcg;
305 struct obj_cgroup *orig_objcg;
306 /* list of inherited objcgs, protected by objcg_lock */
307 struct list_head objcg_list;
310 CACHELINE_PADDING(_pad2_);
313 * set > 0 if pages under this cgroup are moving to other cgroup.
315 atomic_t moving_account;
316 struct task_struct *move_lock_task;
318 struct memcg_vmstats_percpu __percpu *vmstats_percpu;
320 #ifdef CONFIG_CGROUP_WRITEBACK
321 struct list_head cgwb_list;
322 struct wb_domain cgwb_domain;
323 struct memcg_cgwb_frn cgwb_frn[MEMCG_CGWB_FRN_CNT];
326 /* List of events which userspace want to receive */
327 struct list_head event_list;
328 spinlock_t event_list_lock;
330 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
331 struct deferred_split deferred_split_queue;
334 #ifdef CONFIG_LRU_GEN_WALKS_MMU
335 /* per-memcg mm_struct list */
336 struct lru_gen_mm_list mm_list;
339 struct mem_cgroup_per_node *nodeinfo[];
343 * size of first charge trial.
344 * TODO: maybe necessary to use big numbers in big irons or dynamic based of the
347 #define MEMCG_CHARGE_BATCH 64U
349 extern struct mem_cgroup *root_mem_cgroup;
351 enum page_memcg_data_flags {
352 /* page->memcg_data is a pointer to an objcgs vector */
353 MEMCG_DATA_OBJCGS = (1UL << 0),
354 /* page has been accounted as a non-slab kernel page */
355 MEMCG_DATA_KMEM = (1UL << 1),
356 /* the next bit after the last actual flag */
357 __NR_MEMCG_DATA_FLAGS = (1UL << 2),
360 #define MEMCG_DATA_FLAGS_MASK (__NR_MEMCG_DATA_FLAGS - 1)
362 static inline bool folio_memcg_kmem(struct folio *folio);
365 * After the initialization objcg->memcg is always pointing at
366 * a valid memcg, but can be atomically swapped to the parent memcg.
368 * The caller must ensure that the returned memcg won't be released:
369 * e.g. acquire the rcu_read_lock or css_set_lock.
371 static inline struct mem_cgroup *obj_cgroup_memcg(struct obj_cgroup *objcg)
373 return READ_ONCE(objcg->memcg);
377 * __folio_memcg - Get the memory cgroup associated with a non-kmem folio
378 * @folio: Pointer to the folio.
380 * Returns a pointer to the memory cgroup associated with the folio,
381 * or NULL. This function assumes that the folio is known to have a
382 * proper memory cgroup pointer. It's not safe to call this function
383 * against some type of folios, e.g. slab folios or ex-slab folios or
386 static inline struct mem_cgroup *__folio_memcg(struct folio *folio)
388 unsigned long memcg_data = folio->memcg_data;
390 VM_BUG_ON_FOLIO(folio_test_slab(folio), folio);
391 VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJCGS, folio);
392 VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_KMEM, folio);
394 return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
398 * __folio_objcg - get the object cgroup associated with a kmem folio.
399 * @folio: Pointer to the folio.
401 * Returns a pointer to the object cgroup associated with the folio,
402 * or NULL. This function assumes that the folio is known to have a
403 * proper object cgroup pointer. It's not safe to call this function
404 * against some type of folios, e.g. slab folios or ex-slab folios or
407 static inline struct obj_cgroup *__folio_objcg(struct folio *folio)
409 unsigned long memcg_data = folio->memcg_data;
411 VM_BUG_ON_FOLIO(folio_test_slab(folio), folio);
412 VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJCGS, folio);
413 VM_BUG_ON_FOLIO(!(memcg_data & MEMCG_DATA_KMEM), folio);
415 return (struct obj_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
419 * folio_memcg - Get the memory cgroup associated with a folio.
420 * @folio: Pointer to the folio.
422 * Returns a pointer to the memory cgroup associated with the folio,
423 * or NULL. This function assumes that the folio is known to have a
424 * proper memory cgroup pointer. It's not safe to call this function
425 * against some type of folios, e.g. slab folios or ex-slab folios.
427 * For a non-kmem folio any of the following ensures folio and memcg binding
432 * - folio_memcg_lock()
433 * - exclusive reference
434 * - mem_cgroup_trylock_pages()
436 * For a kmem folio a caller should hold an rcu read lock to protect memcg
437 * associated with a kmem folio from being released.
439 static inline struct mem_cgroup *folio_memcg(struct folio *folio)
441 if (folio_memcg_kmem(folio))
442 return obj_cgroup_memcg(__folio_objcg(folio));
443 return __folio_memcg(folio);
446 static inline struct mem_cgroup *page_memcg(struct page *page)
448 return folio_memcg(page_folio(page));
452 * folio_memcg_rcu - Locklessly get the memory cgroup associated with a folio.
453 * @folio: Pointer to the folio.
455 * This function assumes that the folio is known to have a
456 * proper memory cgroup pointer. It's not safe to call this function
457 * against some type of folios, e.g. slab folios or ex-slab folios.
459 * Return: A pointer to the memory cgroup associated with the folio,
462 static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio)
464 unsigned long memcg_data = READ_ONCE(folio->memcg_data);
466 VM_BUG_ON_FOLIO(folio_test_slab(folio), folio);
467 WARN_ON_ONCE(!rcu_read_lock_held());
469 if (memcg_data & MEMCG_DATA_KMEM) {
470 struct obj_cgroup *objcg;
472 objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
473 return obj_cgroup_memcg(objcg);
476 return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
480 * folio_memcg_check - Get the memory cgroup associated with a folio.
481 * @folio: Pointer to the folio.
483 * Returns a pointer to the memory cgroup associated with the folio,
484 * or NULL. This function unlike folio_memcg() can take any folio
485 * as an argument. It has to be used in cases when it's not known if a folio
486 * has an associated memory cgroup pointer or an object cgroups vector or
489 * For a non-kmem folio any of the following ensures folio and memcg binding
494 * - lock_folio_memcg()
495 * - exclusive reference
496 * - mem_cgroup_trylock_pages()
498 * For a kmem folio a caller should hold an rcu read lock to protect memcg
499 * associated with a kmem folio from being released.
501 static inline struct mem_cgroup *folio_memcg_check(struct folio *folio)
504 * Because folio->memcg_data might be changed asynchronously
505 * for slabs, READ_ONCE() should be used here.
507 unsigned long memcg_data = READ_ONCE(folio->memcg_data);
509 if (memcg_data & MEMCG_DATA_OBJCGS)
512 if (memcg_data & MEMCG_DATA_KMEM) {
513 struct obj_cgroup *objcg;
515 objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
516 return obj_cgroup_memcg(objcg);
519 return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
522 static inline struct mem_cgroup *page_memcg_check(struct page *page)
526 return folio_memcg_check((struct folio *)page);
529 static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg)
531 struct mem_cgroup *memcg;
535 memcg = obj_cgroup_memcg(objcg);
536 if (unlikely(!css_tryget(&memcg->css)))
543 #ifdef CONFIG_MEMCG_KMEM
545 * folio_memcg_kmem - Check if the folio has the memcg_kmem flag set.
546 * @folio: Pointer to the folio.
548 * Checks if the folio has MemcgKmem flag set. The caller must ensure
549 * that the folio has an associated memory cgroup. It's not safe to call
550 * this function against some types of folios, e.g. slab folios.
552 static inline bool folio_memcg_kmem(struct folio *folio)
554 VM_BUG_ON_PGFLAGS(PageTail(&folio->page), &folio->page);
555 VM_BUG_ON_FOLIO(folio->memcg_data & MEMCG_DATA_OBJCGS, folio);
556 return folio->memcg_data & MEMCG_DATA_KMEM;
561 static inline bool folio_memcg_kmem(struct folio *folio)
568 static inline bool PageMemcgKmem(struct page *page)
570 return folio_memcg_kmem(page_folio(page));
573 static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
575 return (memcg == root_mem_cgroup);
578 static inline bool mem_cgroup_disabled(void)
580 return !cgroup_subsys_enabled(memory_cgrp_subsys);
583 static inline void mem_cgroup_protection(struct mem_cgroup *root,
584 struct mem_cgroup *memcg,
590 if (mem_cgroup_disabled())
594 * There is no reclaim protection applied to a targeted reclaim.
595 * We are special casing this specific case here because
596 * mem_cgroup_calculate_protection is not robust enough to keep
597 * the protection invariant for calculated effective values for
598 * parallel reclaimers with different reclaim target. This is
599 * especially a problem for tail memcgs (as they have pages on LRU)
600 * which would want to have effective values 0 for targeted reclaim
601 * but a different value for external reclaim.
604 * Let's have global and A's reclaim in parallel:
606 * A (low=2G, usage = 3G, max = 3G, children_low_usage = 1.5G)
608 * | C (low = 1G, usage = 2.5G)
609 * B (low = 1G, usage = 0.5G)
611 * For the global reclaim
613 * B.elow = min(B.usage, B.low) because children_low_usage <= A.elow
614 * C.elow = min(C.usage, C.low)
616 * With the effective values resetting we have A reclaim
621 * If the global reclaim races with A's reclaim then
622 * B.elow = C.elow = 0 because children_low_usage > A.elow)
623 * is possible and reclaiming B would be violating the protection.
629 *min = READ_ONCE(memcg->memory.emin);
630 *low = READ_ONCE(memcg->memory.elow);
633 void mem_cgroup_calculate_protection(struct mem_cgroup *root,
634 struct mem_cgroup *memcg);
636 static inline bool mem_cgroup_unprotected(struct mem_cgroup *target,
637 struct mem_cgroup *memcg)
640 * The root memcg doesn't account charges, and doesn't support
641 * protection. The target memcg's protection is ignored, see
642 * mem_cgroup_calculate_protection() and mem_cgroup_protection()
644 return mem_cgroup_disabled() || mem_cgroup_is_root(memcg) ||
648 static inline bool mem_cgroup_below_low(struct mem_cgroup *target,
649 struct mem_cgroup *memcg)
651 if (mem_cgroup_unprotected(target, memcg))
654 return READ_ONCE(memcg->memory.elow) >=
655 page_counter_read(&memcg->memory);
658 static inline bool mem_cgroup_below_min(struct mem_cgroup *target,
659 struct mem_cgroup *memcg)
661 if (mem_cgroup_unprotected(target, memcg))
664 return READ_ONCE(memcg->memory.emin) >=
665 page_counter_read(&memcg->memory);
668 void mem_cgroup_commit_charge(struct folio *folio, struct mem_cgroup *memcg);
670 int __mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp);
673 * mem_cgroup_charge - Charge a newly allocated folio to a cgroup.
674 * @folio: Folio to charge.
675 * @mm: mm context of the allocating task.
676 * @gfp: Reclaim mode.
678 * Try to charge @folio to the memcg that @mm belongs to, reclaiming
679 * pages according to @gfp if necessary. If @mm is NULL, try to
680 * charge to the active memcg.
682 * Do not use this for folios allocated for swapin.
684 * Return: 0 on success. Otherwise, an error code is returned.
686 static inline int mem_cgroup_charge(struct folio *folio, struct mm_struct *mm,
689 if (mem_cgroup_disabled())
691 return __mem_cgroup_charge(folio, mm, gfp);
694 int mem_cgroup_hugetlb_try_charge(struct mem_cgroup *memcg, gfp_t gfp,
697 int mem_cgroup_swapin_charge_folio(struct folio *folio, struct mm_struct *mm,
698 gfp_t gfp, swp_entry_t entry);
699 void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry);
701 void __mem_cgroup_uncharge(struct folio *folio);
704 * mem_cgroup_uncharge - Uncharge a folio.
705 * @folio: Folio to uncharge.
707 * Uncharge a folio previously charged with mem_cgroup_charge().
709 static inline void mem_cgroup_uncharge(struct folio *folio)
711 if (mem_cgroup_disabled())
713 __mem_cgroup_uncharge(folio);
716 void __mem_cgroup_uncharge_folios(struct folio_batch *folios);
717 static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios)
719 if (mem_cgroup_disabled())
721 __mem_cgroup_uncharge_folios(folios);
724 void mem_cgroup_cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages);
725 void mem_cgroup_replace_folio(struct folio *old, struct folio *new);
726 void mem_cgroup_migrate(struct folio *old, struct folio *new);
729 * mem_cgroup_lruvec - get the lru list vector for a memcg & node
730 * @memcg: memcg of the wanted lruvec
731 * @pgdat: pglist_data
733 * Returns the lru list vector holding pages for a given @memcg &
734 * @pgdat combination. This can be the node lruvec, if the memory
735 * controller is disabled.
737 static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
738 struct pglist_data *pgdat)
740 struct mem_cgroup_per_node *mz;
741 struct lruvec *lruvec;
743 if (mem_cgroup_disabled()) {
744 lruvec = &pgdat->__lruvec;
749 memcg = root_mem_cgroup;
751 mz = memcg->nodeinfo[pgdat->node_id];
752 lruvec = &mz->lruvec;
755 * Since a node can be onlined after the mem_cgroup was created,
756 * we have to be prepared to initialize lruvec->pgdat here;
757 * and if offlined then reonlined, we need to reinitialize it.
759 if (unlikely(lruvec->pgdat != pgdat))
760 lruvec->pgdat = pgdat;
765 * folio_lruvec - return lruvec for isolating/putting an LRU folio
766 * @folio: Pointer to the folio.
768 * This function relies on folio->mem_cgroup being stable.
770 static inline struct lruvec *folio_lruvec(struct folio *folio)
772 struct mem_cgroup *memcg = folio_memcg(folio);
774 VM_WARN_ON_ONCE_FOLIO(!memcg && !mem_cgroup_disabled(), folio);
775 return mem_cgroup_lruvec(memcg, folio_pgdat(folio));
778 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
780 struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm);
782 struct mem_cgroup *get_mem_cgroup_from_current(void);
784 struct lruvec *folio_lruvec_lock(struct folio *folio);
785 struct lruvec *folio_lruvec_lock_irq(struct folio *folio);
786 struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio,
787 unsigned long *flags);
789 #ifdef CONFIG_DEBUG_VM
790 void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio);
793 void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio)
799 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
800 return css ? container_of(css, struct mem_cgroup, css) : NULL;
803 static inline bool obj_cgroup_tryget(struct obj_cgroup *objcg)
805 return percpu_ref_tryget(&objcg->refcnt);
808 static inline void obj_cgroup_get(struct obj_cgroup *objcg)
810 percpu_ref_get(&objcg->refcnt);
813 static inline void obj_cgroup_get_many(struct obj_cgroup *objcg,
816 percpu_ref_get_many(&objcg->refcnt, nr);
819 static inline void obj_cgroup_put(struct obj_cgroup *objcg)
821 percpu_ref_put(&objcg->refcnt);
824 static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg)
826 return !memcg || css_tryget(&memcg->css);
829 static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
831 return !memcg || css_tryget_online(&memcg->css);
834 static inline void mem_cgroup_put(struct mem_cgroup *memcg)
837 css_put(&memcg->css);
840 #define mem_cgroup_from_counter(counter, member) \
841 container_of(counter, struct mem_cgroup, member)
843 struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
845 struct mem_cgroup_reclaim_cookie *);
846 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
847 void mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
848 int (*)(struct task_struct *, void *), void *arg);
850 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
852 if (mem_cgroup_disabled())
857 struct mem_cgroup *mem_cgroup_from_id(unsigned short id);
859 #ifdef CONFIG_SHRINKER_DEBUG
860 static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg)
862 return memcg ? cgroup_ino(memcg->css.cgroup) : 0;
865 struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino);
868 static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
870 return mem_cgroup_from_css(seq_css(m));
873 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
875 struct mem_cgroup_per_node *mz;
877 if (mem_cgroup_disabled())
880 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
885 * parent_mem_cgroup - find the accounting parent of a memcg
886 * @memcg: memcg whose parent to find
888 * Returns the parent memcg, or NULL if this is the root.
890 static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
892 return mem_cgroup_from_css(memcg->css.parent);
895 static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
896 struct mem_cgroup *root)
900 return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
903 static inline bool mm_match_cgroup(struct mm_struct *mm,
904 struct mem_cgroup *memcg)
906 struct mem_cgroup *task_memcg;
910 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
912 match = mem_cgroup_is_descendant(task_memcg, memcg);
917 struct cgroup_subsys_state *mem_cgroup_css_from_folio(struct folio *folio);
918 ino_t page_cgroup_ino(struct page *page);
920 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
922 if (mem_cgroup_disabled())
924 return !!(memcg->css.flags & CSS_ONLINE);
927 void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
928 int zid, int nr_pages);
931 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
932 enum lru_list lru, int zone_idx)
934 struct mem_cgroup_per_node *mz;
936 mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
937 return READ_ONCE(mz->lru_zone_size[zone_idx][lru]);
940 void mem_cgroup_handle_over_high(gfp_t gfp_mask);
942 unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg);
944 unsigned long mem_cgroup_size(struct mem_cgroup *memcg);
946 void mem_cgroup_print_oom_context(struct mem_cgroup *memcg,
947 struct task_struct *p);
949 void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg);
951 static inline void mem_cgroup_enter_user_fault(void)
953 WARN_ON(current->in_user_fault);
954 current->in_user_fault = 1;
957 static inline void mem_cgroup_exit_user_fault(void)
959 WARN_ON(!current->in_user_fault);
960 current->in_user_fault = 0;
963 static inline bool task_in_memcg_oom(struct task_struct *p)
965 return p->memcg_in_oom;
968 bool mem_cgroup_oom_synchronize(bool wait);
969 struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim,
970 struct mem_cgroup *oom_domain);
971 void mem_cgroup_print_oom_group(struct mem_cgroup *memcg);
973 void folio_memcg_lock(struct folio *folio);
974 void folio_memcg_unlock(struct folio *folio);
976 void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val);
978 /* try to stablize folio_memcg() for all the pages in a memcg */
979 static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
983 if (mem_cgroup_disabled() || !atomic_read(&memcg->moving_account))
990 static inline void mem_cgroup_unlock_pages(void)
995 /* idx can be of type enum memcg_stat_item or node_stat_item */
996 static inline void mod_memcg_state(struct mem_cgroup *memcg,
1001 local_irq_save(flags);
1002 __mod_memcg_state(memcg, idx, val);
1003 local_irq_restore(flags);
1006 static inline void mod_memcg_page_state(struct page *page,
1009 struct mem_cgroup *memcg;
1011 if (mem_cgroup_disabled())
1015 memcg = page_memcg(page);
1017 mod_memcg_state(memcg, idx, val);
1021 unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx);
1023 static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
1024 enum node_stat_item idx)
1026 struct mem_cgroup_per_node *pn;
1029 if (mem_cgroup_disabled())
1030 return node_page_state(lruvec_pgdat(lruvec), idx);
1032 pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
1033 x = READ_ONCE(pn->lruvec_stats.state[idx]);
1041 static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec,
1042 enum node_stat_item idx)
1044 struct mem_cgroup_per_node *pn;
1047 if (mem_cgroup_disabled())
1048 return node_page_state(lruvec_pgdat(lruvec), idx);
1050 pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
1051 x = READ_ONCE(pn->lruvec_stats.state_local[idx]);
1059 void mem_cgroup_flush_stats(struct mem_cgroup *memcg);
1060 void mem_cgroup_flush_stats_ratelimited(struct mem_cgroup *memcg);
1062 void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
1064 void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val);
1066 static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
1069 unsigned long flags;
1071 local_irq_save(flags);
1072 __mod_lruvec_kmem_state(p, idx, val);
1073 local_irq_restore(flags);
1076 static inline void mod_memcg_lruvec_state(struct lruvec *lruvec,
1077 enum node_stat_item idx, int val)
1079 unsigned long flags;
1081 local_irq_save(flags);
1082 __mod_memcg_lruvec_state(lruvec, idx, val);
1083 local_irq_restore(flags);
1086 void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
1087 unsigned long count);
1089 static inline void count_memcg_events(struct mem_cgroup *memcg,
1090 enum vm_event_item idx,
1091 unsigned long count)
1093 unsigned long flags;
1095 local_irq_save(flags);
1096 __count_memcg_events(memcg, idx, count);
1097 local_irq_restore(flags);
1100 static inline void count_memcg_folio_events(struct folio *folio,
1101 enum vm_event_item idx, unsigned long nr)
1103 struct mem_cgroup *memcg = folio_memcg(folio);
1106 count_memcg_events(memcg, idx, nr);
1109 static inline void count_memcg_event_mm(struct mm_struct *mm,
1110 enum vm_event_item idx)
1112 struct mem_cgroup *memcg;
1114 if (mem_cgroup_disabled())
1118 memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
1120 count_memcg_events(memcg, idx, 1);
1124 static inline void memcg_memory_event(struct mem_cgroup *memcg,
1125 enum memcg_memory_event event)
1127 bool swap_event = event == MEMCG_SWAP_HIGH || event == MEMCG_SWAP_MAX ||
1128 event == MEMCG_SWAP_FAIL;
1130 atomic_long_inc(&memcg->memory_events_local[event]);
1132 cgroup_file_notify(&memcg->events_local_file);
1135 atomic_long_inc(&memcg->memory_events[event]);
1137 cgroup_file_notify(&memcg->swap_events_file);
1139 cgroup_file_notify(&memcg->events_file);
1141 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
1143 if (cgrp_dfl_root.flags & CGRP_ROOT_MEMORY_LOCAL_EVENTS)
1145 } while ((memcg = parent_mem_cgroup(memcg)) &&
1146 !mem_cgroup_is_root(memcg));
1149 static inline void memcg_memory_event_mm(struct mm_struct *mm,
1150 enum memcg_memory_event event)
1152 struct mem_cgroup *memcg;
1154 if (mem_cgroup_disabled())
1158 memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
1160 memcg_memory_event(memcg, event);
1164 void split_page_memcg(struct page *head, int old_order, int new_order);
1166 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
1168 unsigned long *total_scanned);
1170 #else /* CONFIG_MEMCG */
1172 #define MEM_CGROUP_ID_SHIFT 0
1174 static inline struct mem_cgroup *folio_memcg(struct folio *folio)
1179 static inline struct mem_cgroup *page_memcg(struct page *page)
1184 static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio)
1186 WARN_ON_ONCE(!rcu_read_lock_held());
1190 static inline struct mem_cgroup *folio_memcg_check(struct folio *folio)
1195 static inline struct mem_cgroup *page_memcg_check(struct page *page)
1200 static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg)
1205 static inline bool folio_memcg_kmem(struct folio *folio)
1210 static inline bool PageMemcgKmem(struct page *page)
1215 static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
1220 static inline bool mem_cgroup_disabled(void)
1225 static inline void memcg_memory_event(struct mem_cgroup *memcg,
1226 enum memcg_memory_event event)
1230 static inline void memcg_memory_event_mm(struct mm_struct *mm,
1231 enum memcg_memory_event event)
1235 static inline void mem_cgroup_protection(struct mem_cgroup *root,
1236 struct mem_cgroup *memcg,
1243 static inline void mem_cgroup_calculate_protection(struct mem_cgroup *root,
1244 struct mem_cgroup *memcg)
1248 static inline bool mem_cgroup_unprotected(struct mem_cgroup *target,
1249 struct mem_cgroup *memcg)
1253 static inline bool mem_cgroup_below_low(struct mem_cgroup *target,
1254 struct mem_cgroup *memcg)
1259 static inline bool mem_cgroup_below_min(struct mem_cgroup *target,
1260 struct mem_cgroup *memcg)
1265 static inline void mem_cgroup_commit_charge(struct folio *folio,
1266 struct mem_cgroup *memcg)
1270 static inline int mem_cgroup_charge(struct folio *folio,
1271 struct mm_struct *mm, gfp_t gfp)
1276 static inline int mem_cgroup_hugetlb_try_charge(struct mem_cgroup *memcg,
1277 gfp_t gfp, long nr_pages)
1282 static inline int mem_cgroup_swapin_charge_folio(struct folio *folio,
1283 struct mm_struct *mm, gfp_t gfp, swp_entry_t entry)
1288 static inline void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry)
1292 static inline void mem_cgroup_uncharge(struct folio *folio)
1296 static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios)
1300 static inline void mem_cgroup_cancel_charge(struct mem_cgroup *memcg,
1301 unsigned int nr_pages)
1305 static inline void mem_cgroup_replace_folio(struct folio *old,
1310 static inline void mem_cgroup_migrate(struct folio *old, struct folio *new)
1314 static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
1315 struct pglist_data *pgdat)
1317 return &pgdat->__lruvec;
1320 static inline struct lruvec *folio_lruvec(struct folio *folio)
1322 struct pglist_data *pgdat = folio_pgdat(folio);
1323 return &pgdat->__lruvec;
1327 void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio)
1331 static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
1336 static inline bool mm_match_cgroup(struct mm_struct *mm,
1337 struct mem_cgroup *memcg)
1342 static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
1347 static inline struct mem_cgroup *get_mem_cgroup_from_current(void)
1353 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css)
1358 static inline void obj_cgroup_put(struct obj_cgroup *objcg)
1362 static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg)
1367 static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
1372 static inline void mem_cgroup_put(struct mem_cgroup *memcg)
1376 static inline struct lruvec *folio_lruvec_lock(struct folio *folio)
1378 struct pglist_data *pgdat = folio_pgdat(folio);
1380 spin_lock(&pgdat->__lruvec.lru_lock);
1381 return &pgdat->__lruvec;
1384 static inline struct lruvec *folio_lruvec_lock_irq(struct folio *folio)
1386 struct pglist_data *pgdat = folio_pgdat(folio);
1388 spin_lock_irq(&pgdat->__lruvec.lru_lock);
1389 return &pgdat->__lruvec;
1392 static inline struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio,
1393 unsigned long *flagsp)
1395 struct pglist_data *pgdat = folio_pgdat(folio);
1397 spin_lock_irqsave(&pgdat->__lruvec.lru_lock, *flagsp);
1398 return &pgdat->__lruvec;
1401 static inline struct mem_cgroup *
1402 mem_cgroup_iter(struct mem_cgroup *root,
1403 struct mem_cgroup *prev,
1404 struct mem_cgroup_reclaim_cookie *reclaim)
1409 static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
1410 struct mem_cgroup *prev)
1414 static inline void mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
1415 int (*fn)(struct task_struct *, void *), void *arg)
1419 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
1424 static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
1427 /* XXX: This should always return root_mem_cgroup */
1431 #ifdef CONFIG_SHRINKER_DEBUG
1432 static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg)
1437 static inline struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
1443 static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
1448 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
1453 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
1459 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
1460 enum lru_list lru, int zone_idx)
1465 static inline unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg)
1470 static inline unsigned long mem_cgroup_size(struct mem_cgroup *memcg)
1476 mem_cgroup_print_oom_context(struct mem_cgroup *memcg, struct task_struct *p)
1481 mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg)
1485 static inline void folio_memcg_lock(struct folio *folio)
1489 static inline void folio_memcg_unlock(struct folio *folio)
1493 static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
1495 /* to match folio_memcg_rcu() */
1500 static inline void mem_cgroup_unlock_pages(void)
1505 static inline void mem_cgroup_handle_over_high(gfp_t gfp_mask)
1509 static inline void mem_cgroup_enter_user_fault(void)
1513 static inline void mem_cgroup_exit_user_fault(void)
1517 static inline bool task_in_memcg_oom(struct task_struct *p)
1522 static inline bool mem_cgroup_oom_synchronize(bool wait)
1527 static inline struct mem_cgroup *mem_cgroup_get_oom_group(
1528 struct task_struct *victim, struct mem_cgroup *oom_domain)
1533 static inline void mem_cgroup_print_oom_group(struct mem_cgroup *memcg)
1537 static inline void __mod_memcg_state(struct mem_cgroup *memcg,
1543 static inline void mod_memcg_state(struct mem_cgroup *memcg,
1549 static inline void mod_memcg_page_state(struct page *page,
1554 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
1559 static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
1560 enum node_stat_item idx)
1562 return node_page_state(lruvec_pgdat(lruvec), idx);
1565 static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec,
1566 enum node_stat_item idx)
1568 return node_page_state(lruvec_pgdat(lruvec), idx);
1571 static inline void mem_cgroup_flush_stats(struct mem_cgroup *memcg)
1575 static inline void mem_cgroup_flush_stats_ratelimited(struct mem_cgroup *memcg)
1579 static inline void __mod_memcg_lruvec_state(struct lruvec *lruvec,
1580 enum node_stat_item idx, int val)
1584 static inline void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
1587 struct page *page = virt_to_head_page(p);
1589 __mod_node_page_state(page_pgdat(page), idx, val);
1592 static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
1595 struct page *page = virt_to_head_page(p);
1597 mod_node_page_state(page_pgdat(page), idx, val);
1600 static inline void count_memcg_events(struct mem_cgroup *memcg,
1601 enum vm_event_item idx,
1602 unsigned long count)
1606 static inline void __count_memcg_events(struct mem_cgroup *memcg,
1607 enum vm_event_item idx,
1608 unsigned long count)
1612 static inline void count_memcg_folio_events(struct folio *folio,
1613 enum vm_event_item idx, unsigned long nr)
1618 void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx)
1622 static inline void split_page_memcg(struct page *head, int old_order, int new_order)
1627 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
1629 unsigned long *total_scanned)
1633 #endif /* CONFIG_MEMCG */
1635 static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx)
1637 __mod_lruvec_kmem_state(p, idx, 1);
1640 static inline void __dec_lruvec_kmem_state(void *p, enum node_stat_item idx)
1642 __mod_lruvec_kmem_state(p, idx, -1);
1645 static inline struct lruvec *parent_lruvec(struct lruvec *lruvec)
1647 struct mem_cgroup *memcg;
1649 memcg = lruvec_memcg(lruvec);
1652 memcg = parent_mem_cgroup(memcg);
1655 return mem_cgroup_lruvec(memcg, lruvec_pgdat(lruvec));
1658 static inline void unlock_page_lruvec(struct lruvec *lruvec)
1660 spin_unlock(&lruvec->lru_lock);
1663 static inline void unlock_page_lruvec_irq(struct lruvec *lruvec)
1665 spin_unlock_irq(&lruvec->lru_lock);
1668 static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec,
1669 unsigned long flags)
1671 spin_unlock_irqrestore(&lruvec->lru_lock, flags);
1674 /* Test requires a stable page->memcg binding, see page_memcg() */
1675 static inline bool folio_matches_lruvec(struct folio *folio,
1676 struct lruvec *lruvec)
1678 return lruvec_pgdat(lruvec) == folio_pgdat(folio) &&
1679 lruvec_memcg(lruvec) == folio_memcg(folio);
1682 /* Don't lock again iff page's lruvec locked */
1683 static inline struct lruvec *folio_lruvec_relock_irq(struct folio *folio,
1684 struct lruvec *locked_lruvec)
1686 if (locked_lruvec) {
1687 if (folio_matches_lruvec(folio, locked_lruvec))
1688 return locked_lruvec;
1690 unlock_page_lruvec_irq(locked_lruvec);
1693 return folio_lruvec_lock_irq(folio);
1696 /* Don't lock again iff folio's lruvec locked */
1697 static inline void folio_lruvec_relock_irqsave(struct folio *folio,
1698 struct lruvec **lruvecp, unsigned long *flags)
1701 if (folio_matches_lruvec(folio, *lruvecp))
1704 unlock_page_lruvec_irqrestore(*lruvecp, *flags);
1707 *lruvecp = folio_lruvec_lock_irqsave(folio, flags);
1710 #ifdef CONFIG_CGROUP_WRITEBACK
1712 struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
1713 void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
1714 unsigned long *pheadroom, unsigned long *pdirty,
1715 unsigned long *pwriteback);
1717 void mem_cgroup_track_foreign_dirty_slowpath(struct folio *folio,
1718 struct bdi_writeback *wb);
1720 static inline void mem_cgroup_track_foreign_dirty(struct folio *folio,
1721 struct bdi_writeback *wb)
1723 struct mem_cgroup *memcg;
1725 if (mem_cgroup_disabled())
1728 memcg = folio_memcg(folio);
1729 if (unlikely(memcg && &memcg->css != wb->memcg_css))
1730 mem_cgroup_track_foreign_dirty_slowpath(folio, wb);
1733 void mem_cgroup_flush_foreign(struct bdi_writeback *wb);
1735 #else /* CONFIG_CGROUP_WRITEBACK */
1737 static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb)
1742 static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
1743 unsigned long *pfilepages,
1744 unsigned long *pheadroom,
1745 unsigned long *pdirty,
1746 unsigned long *pwriteback)
1750 static inline void mem_cgroup_track_foreign_dirty(struct folio *folio,
1751 struct bdi_writeback *wb)
1755 static inline void mem_cgroup_flush_foreign(struct bdi_writeback *wb)
1759 #endif /* CONFIG_CGROUP_WRITEBACK */
1762 bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
1764 void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
1766 extern struct static_key_false memcg_sockets_enabled_key;
1767 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
1768 void mem_cgroup_sk_alloc(struct sock *sk);
1769 void mem_cgroup_sk_free(struct sock *sk);
1770 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
1772 if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
1773 return !!memcg->tcpmem_pressure;
1775 if (time_before(jiffies, READ_ONCE(memcg->socket_pressure)))
1777 } while ((memcg = parent_mem_cgroup(memcg)));
1781 int alloc_shrinker_info(struct mem_cgroup *memcg);
1782 void free_shrinker_info(struct mem_cgroup *memcg);
1783 void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id);
1784 void reparent_shrinker_deferred(struct mem_cgroup *memcg);
1786 #define mem_cgroup_sockets_enabled 0
1787 static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
1788 static inline void mem_cgroup_sk_free(struct sock *sk) { };
1789 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
1794 static inline void set_shrinker_bit(struct mem_cgroup *memcg,
1795 int nid, int shrinker_id)
1800 #ifdef CONFIG_MEMCG_KMEM
1801 bool mem_cgroup_kmem_disabled(void);
1802 int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order);
1803 void __memcg_kmem_uncharge_page(struct page *page, int order);
1806 * The returned objcg pointer is safe to use without additional
1807 * protection within a scope. The scope is defined either by
1808 * the current task (similar to the "current" global variable)
1809 * or by set_active_memcg() pair.
1810 * Please, use obj_cgroup_get() to get a reference if the pointer
1811 * needs to be used outside of the local scope.
1813 struct obj_cgroup *current_obj_cgroup(void);
1814 struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio);
1816 static inline struct obj_cgroup *get_obj_cgroup_from_current(void)
1818 struct obj_cgroup *objcg = current_obj_cgroup();
1821 obj_cgroup_get(objcg);
1826 int obj_cgroup_charge(struct obj_cgroup *objcg, gfp_t gfp, size_t size);
1827 void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size);
1829 extern struct static_key_false memcg_bpf_enabled_key;
1830 static inline bool memcg_bpf_enabled(void)
1832 return static_branch_likely(&memcg_bpf_enabled_key);
1835 extern struct static_key_false memcg_kmem_online_key;
1837 static inline bool memcg_kmem_online(void)
1839 return static_branch_likely(&memcg_kmem_online_key);
1842 static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
1845 if (memcg_kmem_online())
1846 return __memcg_kmem_charge_page(page, gfp, order);
1850 static inline void memcg_kmem_uncharge_page(struct page *page, int order)
1852 if (memcg_kmem_online())
1853 __memcg_kmem_uncharge_page(page, order);
1857 * A helper for accessing memcg's kmem_id, used for getting
1858 * corresponding LRU lists.
1860 static inline int memcg_kmem_id(struct mem_cgroup *memcg)
1862 return memcg ? memcg->kmemcg_id : -1;
1865 struct mem_cgroup *mem_cgroup_from_obj(void *p);
1866 struct mem_cgroup *mem_cgroup_from_slab_obj(void *p);
1868 static inline void count_objcg_event(struct obj_cgroup *objcg,
1869 enum vm_event_item idx)
1871 struct mem_cgroup *memcg;
1873 if (!memcg_kmem_online())
1877 memcg = obj_cgroup_memcg(objcg);
1878 count_memcg_events(memcg, idx, 1);
1883 static inline bool mem_cgroup_kmem_disabled(void)
1888 static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
1894 static inline void memcg_kmem_uncharge_page(struct page *page, int order)
1898 static inline int __memcg_kmem_charge_page(struct page *page, gfp_t gfp,
1904 static inline void __memcg_kmem_uncharge_page(struct page *page, int order)
1908 static inline struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio)
1913 static inline bool memcg_bpf_enabled(void)
1918 static inline bool memcg_kmem_online(void)
1923 static inline int memcg_kmem_id(struct mem_cgroup *memcg)
1928 static inline struct mem_cgroup *mem_cgroup_from_obj(void *p)
1933 static inline struct mem_cgroup *mem_cgroup_from_slab_obj(void *p)
1938 static inline void count_objcg_event(struct obj_cgroup *objcg,
1939 enum vm_event_item idx)
1943 #endif /* CONFIG_MEMCG_KMEM */
1945 #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
1946 bool obj_cgroup_may_zswap(struct obj_cgroup *objcg);
1947 void obj_cgroup_charge_zswap(struct obj_cgroup *objcg, size_t size);
1948 void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg, size_t size);
1949 bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg);
1951 static inline bool obj_cgroup_may_zswap(struct obj_cgroup *objcg)
1955 static inline void obj_cgroup_charge_zswap(struct obj_cgroup *objcg,
1959 static inline void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg,
1963 static inline bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg)
1965 /* if zswap is disabled, do not block pages going to the swapping device */
1970 #endif /* _LINUX_MEMCONTROL_H */