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TOMOYO Linux Cross Reference
Linux/include/linux/memcontrol.h

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  1 /* memcontrol.h - Memory Controller
  2  *
  3  * Copyright IBM Corporation, 2007
  4  * Author Balbir Singh <balbir@linux.vnet.ibm.com>
  5  *
  6  * Copyright 2007 OpenVZ SWsoft Inc
  7  * Author: Pavel Emelianov <xemul@openvz.org>
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License as published by
 11  * the Free Software Foundation; either version 2 of the License, or
 12  * (at your option) any later version.
 13  *
 14  * This program is distributed in the hope that it will be useful,
 15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  * GNU General Public License for more details.
 18  */
 19 
 20 #ifndef _LINUX_MEMCONTROL_H
 21 #define _LINUX_MEMCONTROL_H
 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/mm.h>
 30 #include <linux/vmstat.h>
 31 #include <linux/writeback.h>
 32 #include <linux/page-flags.h>
 33 
 34 struct mem_cgroup;
 35 struct page;
 36 struct mm_struct;
 37 struct kmem_cache;
 38 
 39 /* Cgroup-specific page state, on top of universal node page state */
 40 enum memcg_stat_item {
 41         MEMCG_CACHE = NR_VM_NODE_STAT_ITEMS,
 42         MEMCG_RSS,
 43         MEMCG_RSS_HUGE,
 44         MEMCG_SWAP,
 45         MEMCG_SOCK,
 46         /* XXX: why are these zone and not node counters? */
 47         MEMCG_KERNEL_STACK_KB,
 48         MEMCG_NR_STAT,
 49 };
 50 
 51 enum memcg_memory_event {
 52         MEMCG_LOW,
 53         MEMCG_HIGH,
 54         MEMCG_MAX,
 55         MEMCG_OOM,
 56         MEMCG_OOM_KILL,
 57         MEMCG_SWAP_MAX,
 58         MEMCG_SWAP_FAIL,
 59         MEMCG_NR_MEMORY_EVENTS,
 60 };
 61 
 62 enum mem_cgroup_protection {
 63         MEMCG_PROT_NONE,
 64         MEMCG_PROT_LOW,
 65         MEMCG_PROT_MIN,
 66 };
 67 
 68 struct mem_cgroup_reclaim_cookie {
 69         pg_data_t *pgdat;
 70         int priority;
 71         unsigned int generation;
 72 };
 73 
 74 #ifdef CONFIG_MEMCG
 75 
 76 #define MEM_CGROUP_ID_SHIFT     16
 77 #define MEM_CGROUP_ID_MAX       USHRT_MAX
 78 
 79 struct mem_cgroup_id {
 80         int id;
 81         refcount_t ref;
 82 };
 83 
 84 /*
 85  * Per memcg event counter is incremented at every pagein/pageout. With THP,
 86  * it will be incremated by the number of pages. This counter is used for
 87  * for trigger some periodic events. This is straightforward and better
 88  * than using jiffies etc. to handle periodic memcg event.
 89  */
 90 enum mem_cgroup_events_target {
 91         MEM_CGROUP_TARGET_THRESH,
 92         MEM_CGROUP_TARGET_SOFTLIMIT,
 93         MEM_CGROUP_TARGET_NUMAINFO,
 94         MEM_CGROUP_NTARGETS,
 95 };
 96 
 97 struct mem_cgroup_stat_cpu {
 98         long count[MEMCG_NR_STAT];
 99         unsigned long events[NR_VM_EVENT_ITEMS];
100         unsigned long nr_page_events;
101         unsigned long targets[MEM_CGROUP_NTARGETS];
102 };
103 
104 struct mem_cgroup_reclaim_iter {
105         struct mem_cgroup *position;
106         /* scan generation, increased every round-trip */
107         unsigned int generation;
108 };
109 
110 struct lruvec_stat {
111         long count[NR_VM_NODE_STAT_ITEMS];
112 };
113 
114 /*
115  * Bitmap of shrinker::id corresponding to memcg-aware shrinkers,
116  * which have elements charged to this memcg.
117  */
118 struct memcg_shrinker_map {
119         struct rcu_head rcu;
120         unsigned long map[0];
121 };
122 
123 /*
124  * per-zone information in memory controller.
125  */
126 struct mem_cgroup_per_node {
127         struct lruvec           lruvec;
128 
129         struct lruvec_stat __percpu *lruvec_stat_cpu;
130         atomic_long_t           lruvec_stat[NR_VM_NODE_STAT_ITEMS];
131 
132         unsigned long           lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];
133 
134         struct mem_cgroup_reclaim_iter  iter[DEF_PRIORITY + 1];
135 
136 #ifdef CONFIG_MEMCG_KMEM
137         struct memcg_shrinker_map __rcu *shrinker_map;
138 #endif
139         struct rb_node          tree_node;      /* RB tree node */
140         unsigned long           usage_in_excess;/* Set to the value by which */
141                                                 /* the soft limit is exceeded*/
142         bool                    on_tree;
143         bool                    congested;      /* memcg has many dirty pages */
144                                                 /* backed by a congested BDI */
145 
146         struct mem_cgroup       *memcg;         /* Back pointer, we cannot */
147                                                 /* use container_of        */
148 };
149 
150 struct mem_cgroup_threshold {
151         struct eventfd_ctx *eventfd;
152         unsigned long threshold;
153 };
154 
155 /* For threshold */
156 struct mem_cgroup_threshold_ary {
157         /* An array index points to threshold just below or equal to usage. */
158         int current_threshold;
159         /* Size of entries[] */
160         unsigned int size;
161         /* Array of thresholds */
162         struct mem_cgroup_threshold entries[0];
163 };
164 
165 struct mem_cgroup_thresholds {
166         /* Primary thresholds array */
167         struct mem_cgroup_threshold_ary *primary;
168         /*
169          * Spare threshold array.
170          * This is needed to make mem_cgroup_unregister_event() "never fail".
171          * It must be able to store at least primary->size - 1 entries.
172          */
173         struct mem_cgroup_threshold_ary *spare;
174 };
175 
176 enum memcg_kmem_state {
177         KMEM_NONE,
178         KMEM_ALLOCATED,
179         KMEM_ONLINE,
180 };
181 
182 #if defined(CONFIG_SMP)
183 struct memcg_padding {
184         char x[0];
185 } ____cacheline_internodealigned_in_smp;
186 #define MEMCG_PADDING(name)      struct memcg_padding name;
187 #else
188 #define MEMCG_PADDING(name)
189 #endif
190 
191 /*
192  * The memory controller data structure. The memory controller controls both
193  * page cache and RSS per cgroup. We would eventually like to provide
194  * statistics based on the statistics developed by Rik Van Riel for clock-pro,
195  * to help the administrator determine what knobs to tune.
196  */
197 struct mem_cgroup {
198         struct cgroup_subsys_state css;
199 
200         /* Private memcg ID. Used to ID objects that outlive the cgroup */
201         struct mem_cgroup_id id;
202 
203         /* Accounted resources */
204         struct page_counter memory;
205         struct page_counter swap;
206 
207         /* Legacy consumer-oriented counters */
208         struct page_counter memsw;
209         struct page_counter kmem;
210         struct page_counter tcpmem;
211 
212         /* Upper bound of normal memory consumption range */
213         unsigned long high;
214 
215         /* Range enforcement for interrupt charges */
216         struct work_struct high_work;
217 
218         unsigned long soft_limit;
219 
220         /* vmpressure notifications */
221         struct vmpressure vmpressure;
222 
223         /*
224          * Should the accounting and control be hierarchical, per subtree?
225          */
226         bool use_hierarchy;
227 
228         /*
229          * Should the OOM killer kill all belonging tasks, had it kill one?
230          */
231         bool oom_group;
232 
233         /* protected by memcg_oom_lock */
234         bool            oom_lock;
235         int             under_oom;
236 
237         int     swappiness;
238         /* OOM-Killer disable */
239         int             oom_kill_disable;
240 
241         /* memory.events */
242         struct cgroup_file events_file;
243 
244         /* handle for "memory.swap.events" */
245         struct cgroup_file swap_events_file;
246 
247         /* protect arrays of thresholds */
248         struct mutex thresholds_lock;
249 
250         /* thresholds for memory usage. RCU-protected */
251         struct mem_cgroup_thresholds thresholds;
252 
253         /* thresholds for mem+swap usage. RCU-protected */
254         struct mem_cgroup_thresholds memsw_thresholds;
255 
256         /* For oom notifier event fd */
257         struct list_head oom_notify;
258 
259         /*
260          * Should we move charges of a task when a task is moved into this
261          * mem_cgroup ? And what type of charges should we move ?
262          */
263         unsigned long move_charge_at_immigrate;
264         /* taken only while moving_account > 0 */
265         spinlock_t              move_lock;
266         unsigned long           move_lock_flags;
267 
268         MEMCG_PADDING(_pad1_);
269 
270         /*
271          * set > 0 if pages under this cgroup are moving to other cgroup.
272          */
273         atomic_t                moving_account;
274         struct task_struct      *move_lock_task;
275 
276         /* memory.stat */
277         struct mem_cgroup_stat_cpu __percpu *stat_cpu;
278 
279         MEMCG_PADDING(_pad2_);
280 
281         atomic_long_t           stat[MEMCG_NR_STAT];
282         atomic_long_t           events[NR_VM_EVENT_ITEMS];
283         atomic_long_t memory_events[MEMCG_NR_MEMORY_EVENTS];
284 
285         unsigned long           socket_pressure;
286 
287         /* Legacy tcp memory accounting */
288         bool                    tcpmem_active;
289         int                     tcpmem_pressure;
290 
291 #ifdef CONFIG_MEMCG_KMEM
292         /* Index in the kmem_cache->memcg_params.memcg_caches array */
293         int kmemcg_id;
294         enum memcg_kmem_state kmem_state;
295         struct list_head kmem_caches;
296 #endif
297 
298         int last_scanned_node;
299 #if MAX_NUMNODES > 1
300         nodemask_t      scan_nodes;
301         atomic_t        numainfo_events;
302         atomic_t        numainfo_updating;
303 #endif
304 
305 #ifdef CONFIG_CGROUP_WRITEBACK
306         struct list_head cgwb_list;
307         struct wb_domain cgwb_domain;
308 #endif
309 
310         /* List of events which userspace want to receive */
311         struct list_head event_list;
312         spinlock_t event_list_lock;
313 
314         struct mem_cgroup_per_node *nodeinfo[0];
315         /* WARNING: nodeinfo must be the last member here */
316 };
317 
318 /*
319  * size of first charge trial. "32" comes from vmscan.c's magic value.
320  * TODO: maybe necessary to use big numbers in big irons.
321  */
322 #define MEMCG_CHARGE_BATCH 32U
323 
324 extern struct mem_cgroup *root_mem_cgroup;
325 
326 static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
327 {
328         return (memcg == root_mem_cgroup);
329 }
330 
331 static inline bool mem_cgroup_disabled(void)
332 {
333         return !cgroup_subsys_enabled(memory_cgrp_subsys);
334 }
335 
336 enum mem_cgroup_protection mem_cgroup_protected(struct mem_cgroup *root,
337                                                 struct mem_cgroup *memcg);
338 
339 int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
340                           gfp_t gfp_mask, struct mem_cgroup **memcgp,
341                           bool compound);
342 int mem_cgroup_try_charge_delay(struct page *page, struct mm_struct *mm,
343                           gfp_t gfp_mask, struct mem_cgroup **memcgp,
344                           bool compound);
345 void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
346                               bool lrucare, bool compound);
347 void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg,
348                 bool compound);
349 void mem_cgroup_uncharge(struct page *page);
350 void mem_cgroup_uncharge_list(struct list_head *page_list);
351 
352 void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
353 
354 static struct mem_cgroup_per_node *
355 mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid)
356 {
357         return memcg->nodeinfo[nid];
358 }
359 
360 /**
361  * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone
362  * @node: node of the wanted lruvec
363  * @memcg: memcg of the wanted lruvec
364  *
365  * Returns the lru list vector holding pages for a given @node or a given
366  * @memcg and @zone. This can be the node lruvec, if the memory controller
367  * is disabled.
368  */
369 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
370                                 struct mem_cgroup *memcg)
371 {
372         struct mem_cgroup_per_node *mz;
373         struct lruvec *lruvec;
374 
375         if (mem_cgroup_disabled()) {
376                 lruvec = node_lruvec(pgdat);
377                 goto out;
378         }
379 
380         mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id);
381         lruvec = &mz->lruvec;
382 out:
383         /*
384          * Since a node can be onlined after the mem_cgroup was created,
385          * we have to be prepared to initialize lruvec->pgdat here;
386          * and if offlined then reonlined, we need to reinitialize it.
387          */
388         if (unlikely(lruvec->pgdat != pgdat))
389                 lruvec->pgdat = pgdat;
390         return lruvec;
391 }
392 
393 struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
394 
395 bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
396 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
397 
398 struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm);
399 
400 struct mem_cgroup *get_mem_cgroup_from_page(struct page *page);
401 
402 static inline
403 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
404         return css ? container_of(css, struct mem_cgroup, css) : NULL;
405 }
406 
407 static inline void mem_cgroup_put(struct mem_cgroup *memcg)
408 {
409         if (memcg)
410                 css_put(&memcg->css);
411 }
412 
413 #define mem_cgroup_from_counter(counter, member)        \
414         container_of(counter, struct mem_cgroup, member)
415 
416 struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
417                                    struct mem_cgroup *,
418                                    struct mem_cgroup_reclaim_cookie *);
419 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
420 int mem_cgroup_scan_tasks(struct mem_cgroup *,
421                           int (*)(struct task_struct *, void *), void *);
422 
423 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
424 {
425         if (mem_cgroup_disabled())
426                 return 0;
427 
428         return memcg->id.id;
429 }
430 struct mem_cgroup *mem_cgroup_from_id(unsigned short id);
431 
432 static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
433 {
434         return mem_cgroup_from_css(seq_css(m));
435 }
436 
437 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
438 {
439         struct mem_cgroup_per_node *mz;
440 
441         if (mem_cgroup_disabled())
442                 return NULL;
443 
444         mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
445         return mz->memcg;
446 }
447 
448 /**
449  * parent_mem_cgroup - find the accounting parent of a memcg
450  * @memcg: memcg whose parent to find
451  *
452  * Returns the parent memcg, or NULL if this is the root or the memory
453  * controller is in legacy no-hierarchy mode.
454  */
455 static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
456 {
457         if (!memcg->memory.parent)
458                 return NULL;
459         return mem_cgroup_from_counter(memcg->memory.parent, memory);
460 }
461 
462 static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
463                               struct mem_cgroup *root)
464 {
465         if (root == memcg)
466                 return true;
467         if (!root->use_hierarchy)
468                 return false;
469         return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
470 }
471 
472 static inline bool mm_match_cgroup(struct mm_struct *mm,
473                                    struct mem_cgroup *memcg)
474 {
475         struct mem_cgroup *task_memcg;
476         bool match = false;
477 
478         rcu_read_lock();
479         task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
480         if (task_memcg)
481                 match = mem_cgroup_is_descendant(task_memcg, memcg);
482         rcu_read_unlock();
483         return match;
484 }
485 
486 struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page);
487 ino_t page_cgroup_ino(struct page *page);
488 
489 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
490 {
491         if (mem_cgroup_disabled())
492                 return true;
493         return !!(memcg->css.flags & CSS_ONLINE);
494 }
495 
496 /*
497  * For memory reclaim.
498  */
499 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
500 
501 void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
502                 int zid, int nr_pages);
503 
504 unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
505                                            int nid, unsigned int lru_mask);
506 
507 static inline
508 unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
509 {
510         struct mem_cgroup_per_node *mz;
511         unsigned long nr_pages = 0;
512         int zid;
513 
514         mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
515         for (zid = 0; zid < MAX_NR_ZONES; zid++)
516                 nr_pages += mz->lru_zone_size[zid][lru];
517         return nr_pages;
518 }
519 
520 static inline
521 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
522                 enum lru_list lru, int zone_idx)
523 {
524         struct mem_cgroup_per_node *mz;
525 
526         mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
527         return mz->lru_zone_size[zone_idx][lru];
528 }
529 
530 void mem_cgroup_handle_over_high(void);
531 
532 unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg);
533 
534 void mem_cgroup_print_oom_context(struct mem_cgroup *memcg,
535                                 struct task_struct *p);
536 
537 void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg);
538 
539 static inline void mem_cgroup_enter_user_fault(void)
540 {
541         WARN_ON(current->in_user_fault);
542         current->in_user_fault = 1;
543 }
544 
545 static inline void mem_cgroup_exit_user_fault(void)
546 {
547         WARN_ON(!current->in_user_fault);
548         current->in_user_fault = 0;
549 }
550 
551 static inline bool task_in_memcg_oom(struct task_struct *p)
552 {
553         return p->memcg_in_oom;
554 }
555 
556 bool mem_cgroup_oom_synchronize(bool wait);
557 struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim,
558                                             struct mem_cgroup *oom_domain);
559 void mem_cgroup_print_oom_group(struct mem_cgroup *memcg);
560 
561 #ifdef CONFIG_MEMCG_SWAP
562 extern int do_swap_account;
563 #endif
564 
565 struct mem_cgroup *lock_page_memcg(struct page *page);
566 void __unlock_page_memcg(struct mem_cgroup *memcg);
567 void unlock_page_memcg(struct page *page);
568 
569 /* idx can be of type enum memcg_stat_item or node_stat_item */
570 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
571                                              int idx)
572 {
573         long x = atomic_long_read(&memcg->stat[idx]);
574 #ifdef CONFIG_SMP
575         if (x < 0)
576                 x = 0;
577 #endif
578         return x;
579 }
580 
581 /* idx can be of type enum memcg_stat_item or node_stat_item */
582 static inline void __mod_memcg_state(struct mem_cgroup *memcg,
583                                      int idx, int val)
584 {
585         long x;
586 
587         if (mem_cgroup_disabled())
588                 return;
589 
590         x = val + __this_cpu_read(memcg->stat_cpu->count[idx]);
591         if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) {
592                 atomic_long_add(x, &memcg->stat[idx]);
593                 x = 0;
594         }
595         __this_cpu_write(memcg->stat_cpu->count[idx], x);
596 }
597 
598 /* idx can be of type enum memcg_stat_item or node_stat_item */
599 static inline void mod_memcg_state(struct mem_cgroup *memcg,
600                                    int idx, int val)
601 {
602         unsigned long flags;
603 
604         local_irq_save(flags);
605         __mod_memcg_state(memcg, idx, val);
606         local_irq_restore(flags);
607 }
608 
609 /**
610  * mod_memcg_page_state - update page state statistics
611  * @page: the page
612  * @idx: page state item to account
613  * @val: number of pages (positive or negative)
614  *
615  * The @page must be locked or the caller must use lock_page_memcg()
616  * to prevent double accounting when the page is concurrently being
617  * moved to another memcg:
618  *
619  *   lock_page(page) or lock_page_memcg(page)
620  *   if (TestClearPageState(page))
621  *     mod_memcg_page_state(page, state, -1);
622  *   unlock_page(page) or unlock_page_memcg(page)
623  *
624  * Kernel pages are an exception to this, since they'll never move.
625  */
626 static inline void __mod_memcg_page_state(struct page *page,
627                                           int idx, int val)
628 {
629         if (page->mem_cgroup)
630                 __mod_memcg_state(page->mem_cgroup, idx, val);
631 }
632 
633 static inline void mod_memcg_page_state(struct page *page,
634                                         int idx, int val)
635 {
636         if (page->mem_cgroup)
637                 mod_memcg_state(page->mem_cgroup, idx, val);
638 }
639 
640 static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
641                                               enum node_stat_item idx)
642 {
643         struct mem_cgroup_per_node *pn;
644         long x;
645 
646         if (mem_cgroup_disabled())
647                 return node_page_state(lruvec_pgdat(lruvec), idx);
648 
649         pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
650         x = atomic_long_read(&pn->lruvec_stat[idx]);
651 #ifdef CONFIG_SMP
652         if (x < 0)
653                 x = 0;
654 #endif
655         return x;
656 }
657 
658 static inline void __mod_lruvec_state(struct lruvec *lruvec,
659                                       enum node_stat_item idx, int val)
660 {
661         struct mem_cgroup_per_node *pn;
662         long x;
663 
664         /* Update node */
665         __mod_node_page_state(lruvec_pgdat(lruvec), idx, val);
666 
667         if (mem_cgroup_disabled())
668                 return;
669 
670         pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
671 
672         /* Update memcg */
673         __mod_memcg_state(pn->memcg, idx, val);
674 
675         /* Update lruvec */
676         x = val + __this_cpu_read(pn->lruvec_stat_cpu->count[idx]);
677         if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) {
678                 atomic_long_add(x, &pn->lruvec_stat[idx]);
679                 x = 0;
680         }
681         __this_cpu_write(pn->lruvec_stat_cpu->count[idx], x);
682 }
683 
684 static inline void mod_lruvec_state(struct lruvec *lruvec,
685                                     enum node_stat_item idx, int val)
686 {
687         unsigned long flags;
688 
689         local_irq_save(flags);
690         __mod_lruvec_state(lruvec, idx, val);
691         local_irq_restore(flags);
692 }
693 
694 static inline void __mod_lruvec_page_state(struct page *page,
695                                            enum node_stat_item idx, int val)
696 {
697         pg_data_t *pgdat = page_pgdat(page);
698         struct lruvec *lruvec;
699 
700         /* Untracked pages have no memcg, no lruvec. Update only the node */
701         if (!page->mem_cgroup) {
702                 __mod_node_page_state(pgdat, idx, val);
703                 return;
704         }
705 
706         lruvec = mem_cgroup_lruvec(pgdat, page->mem_cgroup);
707         __mod_lruvec_state(lruvec, idx, val);
708 }
709 
710 static inline void mod_lruvec_page_state(struct page *page,
711                                          enum node_stat_item idx, int val)
712 {
713         unsigned long flags;
714 
715         local_irq_save(flags);
716         __mod_lruvec_page_state(page, idx, val);
717         local_irq_restore(flags);
718 }
719 
720 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
721                                                 gfp_t gfp_mask,
722                                                 unsigned long *total_scanned);
723 
724 static inline void __count_memcg_events(struct mem_cgroup *memcg,
725                                         enum vm_event_item idx,
726                                         unsigned long count)
727 {
728         unsigned long x;
729 
730         if (mem_cgroup_disabled())
731                 return;
732 
733         x = count + __this_cpu_read(memcg->stat_cpu->events[idx]);
734         if (unlikely(x > MEMCG_CHARGE_BATCH)) {
735                 atomic_long_add(x, &memcg->events[idx]);
736                 x = 0;
737         }
738         __this_cpu_write(memcg->stat_cpu->events[idx], x);
739 }
740 
741 static inline void count_memcg_events(struct mem_cgroup *memcg,
742                                       enum vm_event_item idx,
743                                       unsigned long count)
744 {
745         unsigned long flags;
746 
747         local_irq_save(flags);
748         __count_memcg_events(memcg, idx, count);
749         local_irq_restore(flags);
750 }
751 
752 static inline void count_memcg_page_event(struct page *page,
753                                           enum vm_event_item idx)
754 {
755         if (page->mem_cgroup)
756                 count_memcg_events(page->mem_cgroup, idx, 1);
757 }
758 
759 static inline void count_memcg_event_mm(struct mm_struct *mm,
760                                         enum vm_event_item idx)
761 {
762         struct mem_cgroup *memcg;
763 
764         if (mem_cgroup_disabled())
765                 return;
766 
767         rcu_read_lock();
768         memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
769         if (likely(memcg))
770                 count_memcg_events(memcg, idx, 1);
771         rcu_read_unlock();
772 }
773 
774 static inline void memcg_memory_event(struct mem_cgroup *memcg,
775                                       enum memcg_memory_event event)
776 {
777         atomic_long_inc(&memcg->memory_events[event]);
778         cgroup_file_notify(&memcg->events_file);
779 }
780 
781 static inline void memcg_memory_event_mm(struct mm_struct *mm,
782                                          enum memcg_memory_event event)
783 {
784         struct mem_cgroup *memcg;
785 
786         if (mem_cgroup_disabled())
787                 return;
788 
789         rcu_read_lock();
790         memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
791         if (likely(memcg))
792                 memcg_memory_event(memcg, event);
793         rcu_read_unlock();
794 }
795 
796 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
797 void mem_cgroup_split_huge_fixup(struct page *head);
798 #endif
799 
800 #else /* CONFIG_MEMCG */
801 
802 #define MEM_CGROUP_ID_SHIFT     0
803 #define MEM_CGROUP_ID_MAX       0
804 
805 struct mem_cgroup;
806 
807 static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
808 {
809         return true;
810 }
811 
812 static inline bool mem_cgroup_disabled(void)
813 {
814         return true;
815 }
816 
817 static inline void memcg_memory_event(struct mem_cgroup *memcg,
818                                       enum memcg_memory_event event)
819 {
820 }
821 
822 static inline void memcg_memory_event_mm(struct mm_struct *mm,
823                                          enum memcg_memory_event event)
824 {
825 }
826 
827 static inline enum mem_cgroup_protection mem_cgroup_protected(
828         struct mem_cgroup *root, struct mem_cgroup *memcg)
829 {
830         return MEMCG_PROT_NONE;
831 }
832 
833 static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
834                                         gfp_t gfp_mask,
835                                         struct mem_cgroup **memcgp,
836                                         bool compound)
837 {
838         *memcgp = NULL;
839         return 0;
840 }
841 
842 static inline int mem_cgroup_try_charge_delay(struct page *page,
843                                               struct mm_struct *mm,
844                                               gfp_t gfp_mask,
845                                               struct mem_cgroup **memcgp,
846                                               bool compound)
847 {
848         *memcgp = NULL;
849         return 0;
850 }
851 
852 static inline void mem_cgroup_commit_charge(struct page *page,
853                                             struct mem_cgroup *memcg,
854                                             bool lrucare, bool compound)
855 {
856 }
857 
858 static inline void mem_cgroup_cancel_charge(struct page *page,
859                                             struct mem_cgroup *memcg,
860                                             bool compound)
861 {
862 }
863 
864 static inline void mem_cgroup_uncharge(struct page *page)
865 {
866 }
867 
868 static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
869 {
870 }
871 
872 static inline void mem_cgroup_migrate(struct page *old, struct page *new)
873 {
874 }
875 
876 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
877                                 struct mem_cgroup *memcg)
878 {
879         return node_lruvec(pgdat);
880 }
881 
882 static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
883                                                     struct pglist_data *pgdat)
884 {
885         return &pgdat->lruvec;
886 }
887 
888 static inline bool mm_match_cgroup(struct mm_struct *mm,
889                 struct mem_cgroup *memcg)
890 {
891         return true;
892 }
893 
894 static inline bool task_in_mem_cgroup(struct task_struct *task,
895                                       const struct mem_cgroup *memcg)
896 {
897         return true;
898 }
899 
900 static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
901 {
902         return NULL;
903 }
904 
905 static inline struct mem_cgroup *get_mem_cgroup_from_page(struct page *page)
906 {
907         return NULL;
908 }
909 
910 static inline void mem_cgroup_put(struct mem_cgroup *memcg)
911 {
912 }
913 
914 static inline struct mem_cgroup *
915 mem_cgroup_iter(struct mem_cgroup *root,
916                 struct mem_cgroup *prev,
917                 struct mem_cgroup_reclaim_cookie *reclaim)
918 {
919         return NULL;
920 }
921 
922 static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
923                                          struct mem_cgroup *prev)
924 {
925 }
926 
927 static inline int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
928                 int (*fn)(struct task_struct *, void *), void *arg)
929 {
930         return 0;
931 }
932 
933 static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
934 {
935         return 0;
936 }
937 
938 static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
939 {
940         WARN_ON_ONCE(id);
941         /* XXX: This should always return root_mem_cgroup */
942         return NULL;
943 }
944 
945 static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
946 {
947         return NULL;
948 }
949 
950 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
951 {
952         return NULL;
953 }
954 
955 static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
956 {
957         return true;
958 }
959 
960 static inline unsigned long
961 mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
962 {
963         return 0;
964 }
965 static inline
966 unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
967                 enum lru_list lru, int zone_idx)
968 {
969         return 0;
970 }
971 
972 static inline unsigned long
973 mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
974                              int nid, unsigned int lru_mask)
975 {
976         return 0;
977 }
978 
979 static inline unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg)
980 {
981         return 0;
982 }
983 
984 static inline void
985 mem_cgroup_print_oom_context(struct mem_cgroup *memcg, struct task_struct *p)
986 {
987 }
988 
989 static inline void
990 mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg)
991 {
992 }
993 
994 static inline struct mem_cgroup *lock_page_memcg(struct page *page)
995 {
996         return NULL;
997 }
998 
999 static inline void __unlock_page_memcg(struct mem_cgroup *memcg)
1000 {
1001 }
1002 
1003 static inline void unlock_page_memcg(struct page *page)
1004 {
1005 }
1006 
1007 static inline void mem_cgroup_handle_over_high(void)
1008 {
1009 }
1010 
1011 static inline void mem_cgroup_enter_user_fault(void)
1012 {
1013 }
1014 
1015 static inline void mem_cgroup_exit_user_fault(void)
1016 {
1017 }
1018 
1019 static inline bool task_in_memcg_oom(struct task_struct *p)
1020 {
1021         return false;
1022 }
1023 
1024 static inline bool mem_cgroup_oom_synchronize(bool wait)
1025 {
1026         return false;
1027 }
1028 
1029 static inline struct mem_cgroup *mem_cgroup_get_oom_group(
1030         struct task_struct *victim, struct mem_cgroup *oom_domain)
1031 {
1032         return NULL;
1033 }
1034 
1035 static inline void mem_cgroup_print_oom_group(struct mem_cgroup *memcg)
1036 {
1037 }
1038 
1039 static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
1040                                              int idx)
1041 {
1042         return 0;
1043 }
1044 
1045 static inline void __mod_memcg_state(struct mem_cgroup *memcg,
1046                                      int idx,
1047                                      int nr)
1048 {
1049 }
1050 
1051 static inline void mod_memcg_state(struct mem_cgroup *memcg,
1052                                    int idx,
1053                                    int nr)
1054 {
1055 }
1056 
1057 static inline void __mod_memcg_page_state(struct page *page,
1058                                           int idx,
1059                                           int nr)
1060 {
1061 }
1062 
1063 static inline void mod_memcg_page_state(struct page *page,
1064                                         int idx,
1065                                         int nr)
1066 {
1067 }
1068 
1069 static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
1070                                               enum node_stat_item idx)
1071 {
1072         return node_page_state(lruvec_pgdat(lruvec), idx);
1073 }
1074 
1075 static inline void __mod_lruvec_state(struct lruvec *lruvec,
1076                                       enum node_stat_item idx, int val)
1077 {
1078         __mod_node_page_state(lruvec_pgdat(lruvec), idx, val);
1079 }
1080 
1081 static inline void mod_lruvec_state(struct lruvec *lruvec,
1082                                     enum node_stat_item idx, int val)
1083 {
1084         mod_node_page_state(lruvec_pgdat(lruvec), idx, val);
1085 }
1086 
1087 static inline void __mod_lruvec_page_state(struct page *page,
1088                                            enum node_stat_item idx, int val)
1089 {
1090         __mod_node_page_state(page_pgdat(page), idx, val);
1091 }
1092 
1093 static inline void mod_lruvec_page_state(struct page *page,
1094                                          enum node_stat_item idx, int val)
1095 {
1096         mod_node_page_state(page_pgdat(page), idx, val);
1097 }
1098 
1099 static inline
1100 unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
1101                                             gfp_t gfp_mask,
1102                                             unsigned long *total_scanned)
1103 {
1104         return 0;
1105 }
1106 
1107 static inline void mem_cgroup_split_huge_fixup(struct page *head)
1108 {
1109 }
1110 
1111 static inline void count_memcg_events(struct mem_cgroup *memcg,
1112                                       enum vm_event_item idx,
1113                                       unsigned long count)
1114 {
1115 }
1116 
1117 static inline void count_memcg_page_event(struct page *page,
1118                                           int idx)
1119 {
1120 }
1121 
1122 static inline
1123 void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx)
1124 {
1125 }
1126 #endif /* CONFIG_MEMCG */
1127 
1128 /* idx can be of type enum memcg_stat_item or node_stat_item */
1129 static inline void __inc_memcg_state(struct mem_cgroup *memcg,
1130                                      int idx)
1131 {
1132         __mod_memcg_state(memcg, idx, 1);
1133 }
1134 
1135 /* idx can be of type enum memcg_stat_item or node_stat_item */
1136 static inline void __dec_memcg_state(struct mem_cgroup *memcg,
1137                                      int idx)
1138 {
1139         __mod_memcg_state(memcg, idx, -1);
1140 }
1141 
1142 /* idx can be of type enum memcg_stat_item or node_stat_item */
1143 static inline void __inc_memcg_page_state(struct page *page,
1144                                           int idx)
1145 {
1146         __mod_memcg_page_state(page, idx, 1);
1147 }
1148 
1149 /* idx can be of type enum memcg_stat_item or node_stat_item */
1150 static inline void __dec_memcg_page_state(struct page *page,
1151                                           int idx)
1152 {
1153         __mod_memcg_page_state(page, idx, -1);
1154 }
1155 
1156 static inline void __inc_lruvec_state(struct lruvec *lruvec,
1157                                       enum node_stat_item idx)
1158 {
1159         __mod_lruvec_state(lruvec, idx, 1);
1160 }
1161 
1162 static inline void __dec_lruvec_state(struct lruvec *lruvec,
1163                                       enum node_stat_item idx)
1164 {
1165         __mod_lruvec_state(lruvec, idx, -1);
1166 }
1167 
1168 static inline void __inc_lruvec_page_state(struct page *page,
1169                                            enum node_stat_item idx)
1170 {
1171         __mod_lruvec_page_state(page, idx, 1);
1172 }
1173 
1174 static inline void __dec_lruvec_page_state(struct page *page,
1175                                            enum node_stat_item idx)
1176 {
1177         __mod_lruvec_page_state(page, idx, -1);
1178 }
1179 
1180 /* idx can be of type enum memcg_stat_item or node_stat_item */
1181 static inline void inc_memcg_state(struct mem_cgroup *memcg,
1182                                    int idx)
1183 {
1184         mod_memcg_state(memcg, idx, 1);
1185 }
1186 
1187 /* idx can be of type enum memcg_stat_item or node_stat_item */
1188 static inline void dec_memcg_state(struct mem_cgroup *memcg,
1189                                    int idx)
1190 {
1191         mod_memcg_state(memcg, idx, -1);
1192 }
1193 
1194 /* idx can be of type enum memcg_stat_item or node_stat_item */
1195 static inline void inc_memcg_page_state(struct page *page,
1196                                         int idx)
1197 {
1198         mod_memcg_page_state(page, idx, 1);
1199 }
1200 
1201 /* idx can be of type enum memcg_stat_item or node_stat_item */
1202 static inline void dec_memcg_page_state(struct page *page,
1203                                         int idx)
1204 {
1205         mod_memcg_page_state(page, idx, -1);
1206 }
1207 
1208 static inline void inc_lruvec_state(struct lruvec *lruvec,
1209                                     enum node_stat_item idx)
1210 {
1211         mod_lruvec_state(lruvec, idx, 1);
1212 }
1213 
1214 static inline void dec_lruvec_state(struct lruvec *lruvec,
1215                                     enum node_stat_item idx)
1216 {
1217         mod_lruvec_state(lruvec, idx, -1);
1218 }
1219 
1220 static inline void inc_lruvec_page_state(struct page *page,
1221                                          enum node_stat_item idx)
1222 {
1223         mod_lruvec_page_state(page, idx, 1);
1224 }
1225 
1226 static inline void dec_lruvec_page_state(struct page *page,
1227                                          enum node_stat_item idx)
1228 {
1229         mod_lruvec_page_state(page, idx, -1);
1230 }
1231 
1232 #ifdef CONFIG_CGROUP_WRITEBACK
1233 
1234 struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
1235 void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
1236                          unsigned long *pheadroom, unsigned long *pdirty,
1237                          unsigned long *pwriteback);
1238 
1239 #else   /* CONFIG_CGROUP_WRITEBACK */
1240 
1241 static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb)
1242 {
1243         return NULL;
1244 }
1245 
1246 static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
1247                                        unsigned long *pfilepages,
1248                                        unsigned long *pheadroom,
1249                                        unsigned long *pdirty,
1250                                        unsigned long *pwriteback)
1251 {
1252 }
1253 
1254 #endif  /* CONFIG_CGROUP_WRITEBACK */
1255 
1256 struct sock;
1257 bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
1258 void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
1259 #ifdef CONFIG_MEMCG
1260 extern struct static_key_false memcg_sockets_enabled_key;
1261 #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key)
1262 void mem_cgroup_sk_alloc(struct sock *sk);
1263 void mem_cgroup_sk_free(struct sock *sk);
1264 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
1265 {
1266         if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_pressure)
1267                 return true;
1268         do {
1269                 if (time_before(jiffies, memcg->socket_pressure))
1270                         return true;
1271         } while ((memcg = parent_mem_cgroup(memcg)));
1272         return false;
1273 }
1274 #else
1275 #define mem_cgroup_sockets_enabled 0
1276 static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
1277 static inline void mem_cgroup_sk_free(struct sock *sk) { };
1278 static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
1279 {
1280         return false;
1281 }
1282 #endif
1283 
1284 struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep);
1285 void memcg_kmem_put_cache(struct kmem_cache *cachep);
1286 
1287 #ifdef CONFIG_MEMCG_KMEM
1288 int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order);
1289 void __memcg_kmem_uncharge(struct page *page, int order);
1290 int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
1291                               struct mem_cgroup *memcg);
1292 
1293 extern struct static_key_false memcg_kmem_enabled_key;
1294 extern struct workqueue_struct *memcg_kmem_cache_wq;
1295 
1296 extern int memcg_nr_cache_ids;
1297 void memcg_get_cache_ids(void);
1298 void memcg_put_cache_ids(void);
1299 
1300 /*
1301  * Helper macro to loop through all memcg-specific caches. Callers must still
1302  * check if the cache is valid (it is either valid or NULL).
1303  * the slab_mutex must be held when looping through those caches
1304  */
1305 #define for_each_memcg_cache_index(_idx)        \
1306         for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++)
1307 
1308 static inline bool memcg_kmem_enabled(void)
1309 {
1310         return static_branch_unlikely(&memcg_kmem_enabled_key);
1311 }
1312 
1313 static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order)
1314 {
1315         if (memcg_kmem_enabled())
1316                 return __memcg_kmem_charge(page, gfp, order);
1317         return 0;
1318 }
1319 
1320 static inline void memcg_kmem_uncharge(struct page *page, int order)
1321 {
1322         if (memcg_kmem_enabled())
1323                 __memcg_kmem_uncharge(page, order);
1324 }
1325 
1326 static inline int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp,
1327                                           int order, struct mem_cgroup *memcg)
1328 {
1329         if (memcg_kmem_enabled())
1330                 return __memcg_kmem_charge_memcg(page, gfp, order, memcg);
1331         return 0;
1332 }
1333 /*
1334  * helper for accessing a memcg's index. It will be used as an index in the
1335  * child cache array in kmem_cache, and also to derive its name. This function
1336  * will return -1 when this is not a kmem-limited memcg.
1337  */
1338 static inline int memcg_cache_id(struct mem_cgroup *memcg)
1339 {
1340         return memcg ? memcg->kmemcg_id : -1;
1341 }
1342 
1343 extern int memcg_expand_shrinker_maps(int new_id);
1344 
1345 extern void memcg_set_shrinker_bit(struct mem_cgroup *memcg,
1346                                    int nid, int shrinker_id);
1347 #else
1348 
1349 static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order)
1350 {
1351         return 0;
1352 }
1353 
1354 static inline void memcg_kmem_uncharge(struct page *page, int order)
1355 {
1356 }
1357 
1358 static inline int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order)
1359 {
1360         return 0;
1361 }
1362 
1363 static inline void __memcg_kmem_uncharge(struct page *page, int order)
1364 {
1365 }
1366 
1367 #define for_each_memcg_cache_index(_idx)        \
1368         for (; NULL; )
1369 
1370 static inline bool memcg_kmem_enabled(void)
1371 {
1372         return false;
1373 }
1374 
1375 static inline int memcg_cache_id(struct mem_cgroup *memcg)
1376 {
1377         return -1;
1378 }
1379 
1380 static inline void memcg_get_cache_ids(void)
1381 {
1382 }
1383 
1384 static inline void memcg_put_cache_ids(void)
1385 {
1386 }
1387 
1388 static inline void memcg_set_shrinker_bit(struct mem_cgroup *memcg,
1389                                           int nid, int shrinker_id) { }
1390 #endif /* CONFIG_MEMCG_KMEM */
1391 
1392 #endif /* _LINUX_MEMCONTROL_H */
1393 

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