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Balbir Singh8cdea7c2008-02-07 00:13:50 -08001/* memcontrol.h - Memory Controller
2 *
3 * Copyright IBM Corporation, 2007
4 * Author Balbir Singh <balbir@linux.vnet.ibm.com>
5 *
Pavel Emelianov78fb7462008-02-07 00:13:51 -08006 * Copyright 2007 OpenVZ SWsoft Inc
7 * Author: Pavel Emelianov <xemul@openvz.org>
8 *
Balbir Singh8cdea7c2008-02-07 00:13:50 -08009 * 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
Hirokazu Takahashif8d665422009-01-07 18:08:02 -080022#include <linux/cgroup.h>
Ying Han456f9982011-05-26 16:25:38 -070023#include <linux/vm_event_item.h>
Glauber Costa7ae1e1d2012-12-18 14:21:56 -080024#include <linux/hardirq.h>
Glauber Costaa8964b92012-12-18 14:22:09 -080025#include <linux/jump_label.h>
Ying Han456f9982011-05-26 16:25:38 -070026
Pavel Emelianov78fb7462008-02-07 00:13:51 -080027struct mem_cgroup;
28struct page_cgroup;
Balbir Singh8697d332008-02-07 00:13:59 -080029struct page;
30struct mm_struct;
Glauber Costa2633d7a2012-12-18 14:22:34 -080031struct kmem_cache;
Pavel Emelianov78fb7462008-02-07 00:13:51 -080032
Sha Zhengju68b48762013-09-12 15:13:50 -070033/*
34 * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c,
35 * These two lists should keep in accord with each other.
36 */
37enum mem_cgroup_stat_index {
38 /*
39 * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
40 */
41 MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
42 MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
43 MEM_CGROUP_STAT_RSS_HUGE, /* # of pages charged as anon huge */
44 MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
Sha Zhengju3ea67d02013-09-12 15:13:53 -070045 MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */
Sha Zhengju68b48762013-09-12 15:13:50 -070046 MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
47 MEM_CGROUP_STAT_NSTATS,
Greg Thelen2a7106f2011-01-13 15:47:37 -080048};
49
Johannes Weiner56600482012-01-12 17:17:59 -080050struct mem_cgroup_reclaim_cookie {
51 struct zone *zone;
52 int priority;
53 unsigned int generation;
54};
55
Andrew Mortonc255a452012-07-31 16:43:02 -070056#ifdef CONFIG_MEMCG
KAMEZAWA Hiroyuki2c26fdd2009-01-07 18:08:10 -080057/*
58 * All "charge" functions with gfp_mask should use GFP_KERNEL or
59 * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
60 * alloc memory but reclaims memory from all available zones. So, "where I want
61 * memory from" bits of gfp_mask has no meaning. So any bits of that field is
62 * available but adding a rule is better. charge functions' gfp_mask should
63 * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
64 * codes.
65 * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
66 */
Pavel Emelianov78fb7462008-02-07 00:13:51 -080067
Michal Hockod715ae02014-04-07 15:37:46 -070068extern int mem_cgroup_charge_anon(struct page *page, struct mm_struct *mm,
Balbir Singhe1a1cd52008-02-07 00:14:02 -080069 gfp_t gfp_mask);
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080070/* for swap handling */
KAMEZAWA Hiroyuki8c7c6e342009-01-07 18:08:00 -080071extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
Johannes Weiner72835c82012-01-12 17:18:32 -080072 struct page *page, gfp_t mask, struct mem_cgroup **memcgp);
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080073extern void mem_cgroup_commit_charge_swapin(struct page *page,
Johannes Weiner72835c82012-01-12 17:18:32 -080074 struct mem_cgroup *memcg);
75extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg);
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -080076
Michal Hockod715ae02014-04-07 15:37:46 -070077extern int mem_cgroup_charge_file(struct page *page, struct mm_struct *mm,
Hugh Dickins82895462008-03-04 14:29:08 -080078 gfp_t gfp_mask);
Johannes Weiner925b7672012-01-12 17:18:15 -080079
80struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
Hugh Dickinsfa9add62012-05-29 15:07:09 -070081struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
KAMEZAWA Hiroyuki569b8462009-12-15 16:47:03 -080082
83/* For coalescing uncharge for reducing memcg' overhead*/
84extern void mem_cgroup_uncharge_start(void);
85extern void mem_cgroup_uncharge_end(void);
86
Balbir Singh3c541e12008-02-07 00:14:41 -080087extern void mem_cgroup_uncharge_page(struct page *page);
KAMEZAWA Hiroyuki69029cd2008-07-25 01:47:14 -070088extern void mem_cgroup_uncharge_cache_page(struct page *page);
KAMEZAWA Hiroyukic9b0ed52008-07-25 01:47:15 -070089
Johannes Weinerc3ac9a82012-05-29 15:06:25 -070090bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
91 struct mem_cgroup *memcg);
David Rientjesffbdccf2013-07-03 15:01:23 -070092bool task_in_mem_cgroup(struct task_struct *task,
93 const struct mem_cgroup *memcg);
David Rientjes3062fc62008-02-07 00:14:03 -080094
Wu Fengguange42d9d52009-12-16 12:19:59 +010095extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
Balbir Singhcf475ad2008-04-29 01:00:16 -070096extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
97
Glauber Costae1aab162011-12-11 21:47:03 +000098extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
Tejun Heo182446d2013-08-08 20:11:24 -040099extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css);
Glauber Costae1aab162011-12-11 21:47:03 +0000100
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800101static inline
Johannes Weiner587af302012-10-08 16:34:12 -0700102bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg)
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800103{
Johannes Weiner587af302012-10-08 16:34:12 -0700104 struct mem_cgroup *task_memcg;
105 bool match;
Johannes Weinerc3ac9a82012-05-29 15:06:25 -0700106
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800107 rcu_read_lock();
Johannes Weiner587af302012-10-08 16:34:12 -0700108 task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
109 match = __mem_cgroup_same_or_subtree(memcg, task_memcg);
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800110 rcu_read_unlock();
Johannes Weinerc3ac9a82012-05-29 15:06:25 -0700111 return match;
Lai Jiangshan2e4d4092009-01-07 18:08:07 -0800112}
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800113
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700114extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
Wu Fengguangd3242362009-12-16 12:19:59 +0100115
Johannes Weiner0030f532012-07-31 16:45:25 -0700116extern void
117mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
118 struct mem_cgroup **memcgp);
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700119extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
Daisuke Nishimura50de1dd2011-01-13 15:47:43 -0800120 struct page *oldpage, struct page *newpage, bool migration_ok);
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800121
Andrew Morton694fbc02013-09-24 15:27:37 -0700122struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
123 struct mem_cgroup *,
124 struct mem_cgroup_reclaim_cookie *);
Johannes Weiner56600482012-01-12 17:17:59 -0800125void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
126
KAMEZAWA Hiroyuki58ae83d2008-02-07 00:14:32 -0800127/*
128 * For memory reclaim.
129 */
Konstantin Khlebnikovc56d5c72012-05-29 15:07:00 -0700130int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec);
Ying Han889976d2011-05-26 16:25:33 -0700131int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
Hugh Dickins4d7dcca2012-05-29 15:07:08 -0700132unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700133void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
Balbir Singhe2224322009-04-02 16:57:39 -0700134extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
135 struct task_struct *p);
KAMEZAWA Hiroyukiab936cb2012-01-12 17:17:44 -0800136extern void mem_cgroup_replace_page_cache(struct page *oldpage,
137 struct page *newpage);
KAMEZAWA Hiroyuki58ae83d2008-02-07 00:14:32 -0800138
Johannes Weiner49426422013-10-16 13:46:59 -0700139static inline void mem_cgroup_oom_enable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700140{
Johannes Weiner49426422013-10-16 13:46:59 -0700141 WARN_ON(current->memcg_oom.may_oom);
142 current->memcg_oom.may_oom = 1;
Johannes Weiner519e5242013-09-12 15:13:42 -0700143}
144
Johannes Weiner49426422013-10-16 13:46:59 -0700145static inline void mem_cgroup_oom_disable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700146{
Johannes Weiner49426422013-10-16 13:46:59 -0700147 WARN_ON(!current->memcg_oom.may_oom);
148 current->memcg_oom.may_oom = 0;
Johannes Weiner519e5242013-09-12 15:13:42 -0700149}
150
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700151static inline bool task_in_memcg_oom(struct task_struct *p)
152{
Johannes Weiner49426422013-10-16 13:46:59 -0700153 return p->memcg_oom.memcg;
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700154}
155
Johannes Weiner49426422013-10-16 13:46:59 -0700156bool mem_cgroup_oom_synchronize(bool wait);
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700157
Andrew Mortonc255a452012-07-31 16:43:02 -0700158#ifdef CONFIG_MEMCG_SWAP
KAMEZAWA Hiroyukic0777192009-01-07 18:07:57 -0800159extern int do_swap_account;
160#endif
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800161
162static inline bool mem_cgroup_disabled(void)
163{
Tejun Heo073219e2014-02-08 10:36:58 -0500164 if (memory_cgrp_subsys.disabled)
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800165 return true;
166 return false;
167}
168
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700169void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked,
170 unsigned long *flags);
171
KAMEZAWA Hiroyuki4331f7d2012-03-21 16:34:26 -0700172extern atomic_t memcg_moving;
173
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700174static inline void mem_cgroup_begin_update_page_stat(struct page *page,
175 bool *locked, unsigned long *flags)
176{
177 if (mem_cgroup_disabled())
178 return;
179 rcu_read_lock();
180 *locked = false;
KAMEZAWA Hiroyuki4331f7d2012-03-21 16:34:26 -0700181 if (atomic_read(&memcg_moving))
182 __mem_cgroup_begin_update_page_stat(page, locked, flags);
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700183}
184
185void __mem_cgroup_end_update_page_stat(struct page *page,
186 unsigned long *flags);
187static inline void mem_cgroup_end_update_page_stat(struct page *page,
188 bool *locked, unsigned long *flags)
189{
190 if (mem_cgroup_disabled())
191 return;
192 if (*locked)
193 __mem_cgroup_end_update_page_stat(page, flags);
194 rcu_read_unlock();
195}
196
Greg Thelen2a7106f2011-01-13 15:47:37 -0800197void mem_cgroup_update_page_stat(struct page *page,
Sha Zhengju68b48762013-09-12 15:13:50 -0700198 enum mem_cgroup_stat_index idx,
Greg Thelen2a7106f2011-01-13 15:47:37 -0800199 int val);
200
201static inline void mem_cgroup_inc_page_stat(struct page *page,
Sha Zhengju68b48762013-09-12 15:13:50 -0700202 enum mem_cgroup_stat_index idx)
Greg Thelen2a7106f2011-01-13 15:47:37 -0800203{
204 mem_cgroup_update_page_stat(page, idx, 1);
205}
206
207static inline void mem_cgroup_dec_page_stat(struct page *page,
Sha Zhengju68b48762013-09-12 15:13:50 -0700208 enum mem_cgroup_stat_index idx)
Greg Thelen2a7106f2011-01-13 15:47:37 -0800209{
210 mem_cgroup_update_page_stat(page, idx, -1);
211}
212
Andrew Morton0608f432013-09-24 15:27:41 -0700213unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
214 gfp_t gfp_mask,
215 unsigned long *total_scanned);
David Rientjesa63d83f2010-08-09 17:19:46 -0700216
David Rientjes68ae5642012-12-12 13:51:57 -0800217void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
218static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
219 enum vm_event_item idx)
220{
221 if (mem_cgroup_disabled())
222 return;
223 __mem_cgroup_count_vm_event(mm, idx);
224}
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800225#ifdef CONFIG_TRANSPARENT_HUGEPAGE
KAMEZAWA Hiroyukie94c8a92012-01-12 17:18:20 -0800226void mem_cgroup_split_huge_fixup(struct page *head);
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800227#endif
228
Daisuke Nishimuraf212ad72011-03-23 16:42:25 -0700229#ifdef CONFIG_DEBUG_VM
230bool mem_cgroup_bad_page_check(struct page *page);
231void mem_cgroup_print_bad_page(struct page *page);
232#endif
Andrew Mortonc255a452012-07-31 16:43:02 -0700233#else /* CONFIG_MEMCG */
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800234struct mem_cgroup;
235
Michal Hockod715ae02014-04-07 15:37:46 -0700236static inline int mem_cgroup_charge_anon(struct page *page,
Hugh Dickins82895462008-03-04 14:29:08 -0800237 struct mm_struct *mm, gfp_t gfp_mask)
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800238{
239 return 0;
240}
241
Michal Hockod715ae02014-04-07 15:37:46 -0700242static inline int mem_cgroup_charge_file(struct page *page,
Hugh Dickins82895462008-03-04 14:29:08 -0800243 struct mm_struct *mm, gfp_t gfp_mask)
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800244{
Hugh Dickins82895462008-03-04 14:29:08 -0800245 return 0;
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800246}
247
KAMEZAWA Hiroyuki8c7c6e342009-01-07 18:08:00 -0800248static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
Johannes Weiner72835c82012-01-12 17:18:32 -0800249 struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800250{
251 return 0;
252}
253
254static inline void mem_cgroup_commit_charge_swapin(struct page *page,
Johannes Weiner72835c82012-01-12 17:18:32 -0800255 struct mem_cgroup *memcg)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800256{
257}
258
Johannes Weiner72835c82012-01-12 17:18:32 -0800259static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
KAMEZAWA Hiroyuki7a81b882009-01-07 18:07:48 -0800260{
261}
262
KAMEZAWA Hiroyuki569b8462009-12-15 16:47:03 -0800263static inline void mem_cgroup_uncharge_start(void)
264{
265}
266
267static inline void mem_cgroup_uncharge_end(void)
268{
269}
270
Balbir Singh8a9f3cc2008-02-07 00:13:53 -0800271static inline void mem_cgroup_uncharge_page(struct page *page)
272{
273}
274
KAMEZAWA Hiroyuki69029cd2008-07-25 01:47:14 -0700275static inline void mem_cgroup_uncharge_cache_page(struct page *page)
276{
277}
278
Johannes Weiner925b7672012-01-12 17:18:15 -0800279static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
280 struct mem_cgroup *memcg)
281{
282 return &zone->lruvec;
283}
284
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700285static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
286 struct zone *zone)
Minchan Kim3f58a822011-03-22 16:32:53 -0700287{
Johannes Weiner925b7672012-01-12 17:18:15 -0800288 return &zone->lruvec;
Balbir Singh66e17072008-02-07 00:13:56 -0800289}
290
Wu Fengguange42d9d52009-12-16 12:19:59 +0100291static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
292{
293 return NULL;
294}
295
Johannes Weiner587af302012-10-08 16:34:12 -0700296static inline bool mm_match_cgroup(struct mm_struct *mm,
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700297 struct mem_cgroup *memcg)
Balbir Singhbed71612008-02-07 00:14:01 -0800298{
Johannes Weiner587af302012-10-08 16:34:12 -0700299 return true;
Balbir Singhbed71612008-02-07 00:14:01 -0800300}
301
David Rientjesffbdccf2013-07-03 15:01:23 -0700302static inline bool task_in_mem_cgroup(struct task_struct *task,
303 const struct mem_cgroup *memcg)
David Rientjes4c4a2212008-02-07 00:14:06 -0800304{
David Rientjesffbdccf2013-07-03 15:01:23 -0700305 return true;
David Rientjes4c4a2212008-02-07 00:14:06 -0800306}
307
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700308static inline struct cgroup_subsys_state
309 *mem_cgroup_css(struct mem_cgroup *memcg)
Wu Fengguangd3242362009-12-16 12:19:59 +0100310{
311 return NULL;
312}
313
Johannes Weiner0030f532012-07-31 16:45:25 -0700314static inline void
akpm@linux-foundation.orgac39cf82010-05-26 14:42:46 -0700315mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
Johannes Weiner0030f532012-07-31 16:45:25 -0700316 struct mem_cgroup **memcgp)
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800317{
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800318}
319
Raghavendra K Tc0ff4b82011-11-02 13:38:15 -0700320static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
Daisuke Nishimura50de1dd2011-01-13 15:47:43 -0800321 struct page *oldpage, struct page *newpage, bool migration_ok)
KAMEZAWA Hiroyukiae41be32008-02-07 00:14:10 -0800322{
323}
324
Johannes Weiner56600482012-01-12 17:17:59 -0800325static inline struct mem_cgroup *
326mem_cgroup_iter(struct mem_cgroup *root,
327 struct mem_cgroup *prev,
328 struct mem_cgroup_reclaim_cookie *reclaim)
329{
330 return NULL;
331}
332
333static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
334 struct mem_cgroup *prev)
335{
336}
337
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800338static inline bool mem_cgroup_disabled(void)
339{
340 return true;
341}
KAMEZAWA Hiroyukia636b322009-01-07 18:08:08 -0800342
KOSAKI Motohiro14797e22009-01-07 18:08:18 -0800343static inline int
Konstantin Khlebnikovc56d5c72012-05-29 15:07:00 -0700344mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
KOSAKI Motohiro14797e22009-01-07 18:08:18 -0800345{
346 return 1;
347}
348
KOSAKI Motohiroa3d8e052009-01-07 18:08:19 -0800349static inline unsigned long
Hugh Dickins4d7dcca2012-05-29 15:07:08 -0700350mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
KOSAKI Motohiroa3d8e052009-01-07 18:08:19 -0800351{
352 return 0;
353}
354
Hugh Dickinsfa9add62012-05-29 15:07:09 -0700355static inline void
356mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
357 int increment)
KOSAKI Motohiro3e2f41f2009-01-07 18:08:20 -0800358{
KOSAKI Motohiro3e2f41f2009-01-07 18:08:20 -0800359}
360
Balbir Singhe2224322009-04-02 16:57:39 -0700361static inline void
362mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
363{
364}
365
KAMEZAWA Hiroyuki89c06bd2012-03-21 16:34:25 -0700366static inline void mem_cgroup_begin_update_page_stat(struct page *page,
367 bool *locked, unsigned long *flags)
368{
369}
370
371static inline void mem_cgroup_end_update_page_stat(struct page *page,
372 bool *locked, unsigned long *flags)
373{
374}
375
Johannes Weiner49426422013-10-16 13:46:59 -0700376static inline void mem_cgroup_oom_enable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700377{
378}
379
Johannes Weiner49426422013-10-16 13:46:59 -0700380static inline void mem_cgroup_oom_disable(void)
Johannes Weiner519e5242013-09-12 15:13:42 -0700381{
382}
383
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700384static inline bool task_in_memcg_oom(struct task_struct *p)
385{
386 return false;
387}
388
Johannes Weiner49426422013-10-16 13:46:59 -0700389static inline bool mem_cgroup_oom_synchronize(bool wait)
Johannes Weiner3812c8c2013-09-12 15:13:44 -0700390{
391 return false;
392}
393
Greg Thelen2a7106f2011-01-13 15:47:37 -0800394static inline void mem_cgroup_inc_page_stat(struct page *page,
Sha Zhengju68b48762013-09-12 15:13:50 -0700395 enum mem_cgroup_stat_index idx)
Greg Thelen2a7106f2011-01-13 15:47:37 -0800396{
397}
398
399static inline void mem_cgroup_dec_page_stat(struct page *page,
Sha Zhengju68b48762013-09-12 15:13:50 -0700400 enum mem_cgroup_stat_index idx)
Balbir Singhd69b0422009-06-17 16:26:34 -0700401{
402}
403
Balbir Singh4e416952009-09-23 15:56:39 -0700404static inline
Andrew Morton0608f432013-09-24 15:27:41 -0700405unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
406 gfp_t gfp_mask,
407 unsigned long *total_scanned)
Balbir Singh4e416952009-09-23 15:56:39 -0700408{
Andrew Morton0608f432013-09-24 15:27:41 -0700409 return 0;
Balbir Singh4e416952009-09-23 15:56:39 -0700410}
411
KAMEZAWA Hiroyukie94c8a92012-01-12 17:18:20 -0800412static inline void mem_cgroup_split_huge_fixup(struct page *head)
KAMEZAWA Hiroyukica3e0212011-01-20 14:44:24 -0800413{
414}
415
Ying Han456f9982011-05-26 16:25:38 -0700416static inline
417void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
418{
419}
KAMEZAWA Hiroyukiab936cb2012-01-12 17:17:44 -0800420static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
421 struct page *newpage)
422{
423}
Andrew Mortonc255a452012-07-31 16:43:02 -0700424#endif /* CONFIG_MEMCG */
Pavel Emelianov78fb7462008-02-07 00:13:51 -0800425
Andrew Mortonc255a452012-07-31 16:43:02 -0700426#if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM)
Daisuke Nishimuraf212ad72011-03-23 16:42:25 -0700427static inline bool
428mem_cgroup_bad_page_check(struct page *page)
429{
430 return false;
431}
432
433static inline void
434mem_cgroup_print_bad_page(struct page *page)
435{
436}
437#endif
438
Glauber Costae1aab162011-12-11 21:47:03 +0000439enum {
440 UNDER_LIMIT,
441 SOFT_LIMIT,
442 OVER_LIMIT,
443};
444
445struct sock;
David Rientjescd590852012-10-10 15:54:08 -0700446#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
Glauber Costae1aab162011-12-11 21:47:03 +0000447void sock_update_memcg(struct sock *sk);
448void sock_release_memcg(struct sock *sk);
449#else
450static inline void sock_update_memcg(struct sock *sk)
451{
452}
453static inline void sock_release_memcg(struct sock *sk)
454{
455}
David Rientjescd590852012-10-10 15:54:08 -0700456#endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800457
458#ifdef CONFIG_MEMCG_KMEM
Glauber Costaa8964b92012-12-18 14:22:09 -0800459extern struct static_key memcg_kmem_enabled_key;
Glauber Costa749c5412012-12-18 14:23:01 -0800460
461extern int memcg_limited_groups_array_size;
Glauber Costaebe945c2012-12-18 14:23:10 -0800462
463/*
464 * Helper macro to loop through all memcg-specific caches. Callers must still
465 * check if the cache is valid (it is either valid or NULL).
466 * the slab_mutex must be held when looping through those caches
467 */
Glauber Costa749c5412012-12-18 14:23:01 -0800468#define for_each_memcg_cache_index(_idx) \
Glauber Costa91c777d2013-02-04 14:28:49 -0800469 for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++)
Glauber Costa749c5412012-12-18 14:23:01 -0800470
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800471static inline bool memcg_kmem_enabled(void)
472{
Glauber Costaa8964b92012-12-18 14:22:09 -0800473 return static_key_false(&memcg_kmem_enabled_key);
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800474}
475
476/*
477 * In general, we'll do everything in our power to not incur in any overhead
478 * for non-memcg users for the kmem functions. Not even a function call, if we
479 * can avoid it.
480 *
481 * Therefore, we'll inline all those functions so that in the best case, we'll
482 * see that kmemcg is off for everybody and proceed quickly. If it is on,
483 * we'll still do most of the flag checking inline. We check a lot of
484 * conditions, but because they are pretty simple, they are expected to be
485 * fast.
486 */
487bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
488 int order);
489void __memcg_kmem_commit_charge(struct page *page,
490 struct mem_cgroup *memcg, int order);
491void __memcg_kmem_uncharge_pages(struct page *page, int order);
492
Glauber Costa2633d7a2012-12-18 14:22:34 -0800493int memcg_cache_id(struct mem_cgroup *memcg);
Vladimir Davydov5722d092014-04-07 15:39:24 -0700494
Vladimir Davydov363a0442014-01-23 15:52:56 -0800495int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
496 struct kmem_cache *root_cache);
497void memcg_free_cache_params(struct kmem_cache *s);
Glauber Costa2633d7a2012-12-18 14:22:34 -0800498
Glauber Costa55007d82012-12-18 14:22:38 -0800499int memcg_update_cache_size(struct kmem_cache *s, int num_groups);
500void memcg_update_array_size(int num_groups);
Glauber Costad7f25f82012-12-18 14:22:40 -0800501
502struct kmem_cache *
503__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);
504
Vladimir Davydovc67a8a62014-06-04 16:07:39 -0700505int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order);
506void __memcg_uncharge_slab(struct kmem_cache *cachep, int order);
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700507
Vladimir Davydov776ed0f2014-06-04 16:10:02 -0700508int __memcg_cleanup_cache_params(struct kmem_cache *s);
Glauber Costa1f458cb2012-12-18 14:22:50 -0800509
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800510/**
511 * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
512 * @gfp: the gfp allocation flags.
513 * @memcg: a pointer to the memcg this was charged against.
514 * @order: allocation order.
515 *
516 * returns true if the memcg where the current task belongs can hold this
517 * allocation.
518 *
519 * We return true automatically if this allocation is not to be accounted to
520 * any memcg.
521 */
522static inline bool
523memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
524{
525 if (!memcg_kmem_enabled())
526 return true;
527
528 /*
529 * __GFP_NOFAIL allocations will move on even if charging is not
530 * possible. Therefore we don't even try, and have this allocation
531 * unaccounted. We could in theory charge it with
532 * res_counter_charge_nofail, but we hope those allocations are rare,
533 * and won't be worth the trouble.
534 */
Vladimir Davydov52383432014-06-04 16:06:39 -0700535 if (gfp & __GFP_NOFAIL)
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800536 return true;
537 if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
538 return true;
539
540 /* If the test is dying, just let it go. */
541 if (unlikely(fatal_signal_pending(current)))
542 return true;
543
544 return __memcg_kmem_newpage_charge(gfp, memcg, order);
545}
546
547/**
548 * memcg_kmem_uncharge_pages: uncharge pages from memcg
549 * @page: pointer to struct page being freed
550 * @order: allocation order.
551 *
552 * there is no need to specify memcg here, since it is embedded in page_cgroup
553 */
554static inline void
555memcg_kmem_uncharge_pages(struct page *page, int order)
556{
557 if (memcg_kmem_enabled())
558 __memcg_kmem_uncharge_pages(page, order);
559}
560
561/**
562 * memcg_kmem_commit_charge: embeds correct memcg in a page
563 * @page: pointer to struct page recently allocated
564 * @memcg: the memcg structure we charged against
565 * @order: allocation order.
566 *
567 * Needs to be called after memcg_kmem_newpage_charge, regardless of success or
568 * failure of the allocation. if @page is NULL, this function will revert the
569 * charges. Otherwise, it will commit the memcg given by @memcg to the
570 * corresponding page_cgroup.
571 */
572static inline void
573memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
574{
575 if (memcg_kmem_enabled() && memcg)
576 __memcg_kmem_commit_charge(page, memcg, order);
577}
578
Glauber Costad7f25f82012-12-18 14:22:40 -0800579/**
580 * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation
581 * @cachep: the original global kmem cache
582 * @gfp: allocation flags.
583 *
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700584 * All memory allocated from a per-memcg cache is charged to the owner memcg.
Glauber Costad7f25f82012-12-18 14:22:40 -0800585 */
586static __always_inline struct kmem_cache *
587memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
588{
589 if (!memcg_kmem_enabled())
590 return cachep;
591 if (gfp & __GFP_NOFAIL)
592 return cachep;
593 if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
594 return cachep;
595 if (unlikely(fatal_signal_pending(current)))
596 return cachep;
597
598 return __memcg_kmem_get_cache(cachep, gfp);
599}
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800600#else
Glauber Costa749c5412012-12-18 14:23:01 -0800601#define for_each_memcg_cache_index(_idx) \
602 for (; NULL; )
603
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800604static inline bool memcg_kmem_enabled(void)
605{
606 return false;
607}
608
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800609static inline bool
610memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
611{
612 return true;
613}
614
615static inline void memcg_kmem_uncharge_pages(struct page *page, int order)
616{
617}
618
619static inline void
620memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
621{
622}
Glauber Costa2633d7a2012-12-18 14:22:34 -0800623
624static inline int memcg_cache_id(struct mem_cgroup *memcg)
625{
626 return -1;
627}
628
Vladimir Davydov363a0442014-01-23 15:52:56 -0800629static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg,
630 struct kmem_cache *s, struct kmem_cache *root_cache)
Glauber Costa2633d7a2012-12-18 14:22:34 -0800631{
632 return 0;
633}
634
Vladimir Davydov363a0442014-01-23 15:52:56 -0800635static inline void memcg_free_cache_params(struct kmem_cache *s)
636{
637}
638
Glauber Costad7f25f82012-12-18 14:22:40 -0800639static inline struct kmem_cache *
640memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
641{
642 return cachep;
643}
Glauber Costa7ae1e1d2012-12-18 14:21:56 -0800644#endif /* CONFIG_MEMCG_KMEM */
Balbir Singh8cdea7c2008-02-07 00:13:50 -0800645#endif /* _LINUX_MEMCONTROL_H */
646