include/linux/memcontrol.h - kernel/msm-4.19 - Gitiles

 /* memcontrol.h - Memory Controller
  *
  * Copyright IBM Corporation, 2007
  * Author Balbir Singh <balbir@linux.vnet.ibm.com>
  *
  * Copyright 2007 OpenVZ SWsoft Inc
  * Author: Pavel Emelianov <xemul@openvz.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #ifndef _LINUX_MEMCONTROL_H
 #define _LINUX_MEMCONTROL_H
 #include <linux/cgroup.h>
 #include <linux/vm_event_item.h>
 #include <linux/hardirq.h>
 #include <linux/jump_label.h>

 struct mem_cgroup;
 struct page_cgroup;
 struct page;
 struct mm_struct;
 struct kmem_cache;

 /*
  * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c,
  * These two lists should keep in accord with each other.
  */
 enum mem_cgroup_stat_index {
 	/*
 	 * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
 	 */
 	MEM_CGROUP_STAT_CACHE,		/* # of pages charged as cache */
 	MEM_CGROUP_STAT_RSS,		/* # of pages charged as anon rss */
 	MEM_CGROUP_STAT_RSS_HUGE,	/* # of pages charged as anon huge */
 	MEM_CGROUP_STAT_FILE_MAPPED,	/* # of pages charged as file rss */
 	MEM_CGROUP_STAT_WRITEBACK,	/* # of pages under writeback */
 	MEM_CGROUP_STAT_SWAP,		/* # of pages, swapped out */
 	MEM_CGROUP_STAT_NSTATS,
 };

 struct mem_cgroup_reclaim_cookie {
 	struct zone *zone;
 	int priority;
 	unsigned int generation;
 };

 #ifdef CONFIG_MEMCG
 /*
  * All "charge" functions with gfp_mask should use GFP_KERNEL or
  * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
  * alloc memory but reclaims memory from all available zones. So, "where I want
  * memory from" bits of gfp_mask has no meaning. So any bits of that field is
  * available but adding a rule is better. charge functions' gfp_mask should
  * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
  * codes.
  * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
  */

 extern int mem_cgroup_charge_anon(struct page *page, struct mm_struct *mm,
 				gfp_t gfp_mask);
 /* for swap handling */
 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 		struct page *page, gfp_t mask, struct mem_cgroup **memcgp);
 extern void mem_cgroup_commit_charge_swapin(struct page *page,
 					struct mem_cgroup *memcg);
 extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg);

 extern int mem_cgroup_charge_file(struct page *page, struct mm_struct *mm,
 					gfp_t gfp_mask);

 struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
 struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);

 /* For coalescing uncharge for reducing memcg' overhead*/
 extern void mem_cgroup_uncharge_start(void);
 extern void mem_cgroup_uncharge_end(void);

 extern void mem_cgroup_uncharge_page(struct page *page);
 extern void mem_cgroup_uncharge_cache_page(struct page *page);

 bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
 				  struct mem_cgroup *memcg);
 bool task_in_mem_cgroup(struct task_struct *task,
 			const struct mem_cgroup *memcg);

 extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
 extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);

 extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
 extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css);

 static inline
 bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg)
 {
 	struct mem_cgroup *task_memcg;
 	bool match;

 	rcu_read_lock();
 	task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
 	match = __mem_cgroup_same_or_subtree(memcg, task_memcg);
 	rcu_read_unlock();
 	return match;
 }

 extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);

 extern void
 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 			     struct mem_cgroup **memcgp);
 extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
 	struct page *oldpage, struct page *newpage, bool migration_ok);

 struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
 				   struct mem_cgroup *,
 				   struct mem_cgroup_reclaim_cookie *);
 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);

 /*
  * For memory reclaim.
  */
 int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec);
 int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
 unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
 void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
 extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 					struct task_struct *p);
 extern void mem_cgroup_replace_page_cache(struct page *oldpage,
 					struct page *newpage);

 static inline void mem_cgroup_oom_enable(void)
 {
 	WARN_ON(current->memcg_oom.may_oom);
 	current->memcg_oom.may_oom = 1;
 }

 static inline void mem_cgroup_oom_disable(void)
 {
 	WARN_ON(!current->memcg_oom.may_oom);
 	current->memcg_oom.may_oom = 0;
 }

 static inline bool task_in_memcg_oom(struct task_struct *p)
 {
 	return p->memcg_oom.memcg;
 }

 bool mem_cgroup_oom_synchronize(bool wait);

 #ifdef CONFIG_MEMCG_SWAP
 extern int do_swap_account;
 #endif

 static inline bool mem_cgroup_disabled(void)
 {
 	if (memory_cgrp_subsys.disabled)
 		return true;
 	return false;
 }

 void __mem_cgroup_begin_update_page_stat(struct page *page, bool *locked,
 					 unsigned long *flags);

 extern atomic_t memcg_moving;

 static inline void mem_cgroup_begin_update_page_stat(struct page *page,
 					bool *locked, unsigned long *flags)
 {
 	if (mem_cgroup_disabled())
 		return;
 	rcu_read_lock();
 	*locked = false;
 	if (atomic_read(&memcg_moving))
 		__mem_cgroup_begin_update_page_stat(page, locked, flags);
 }

 void __mem_cgroup_end_update_page_stat(struct page *page,
 				unsigned long *flags);
 static inline void mem_cgroup_end_update_page_stat(struct page *page,
 					bool *locked, unsigned long *flags)
 {
 	if (mem_cgroup_disabled())
 		return;
 	if (*locked)
 		__mem_cgroup_end_update_page_stat(page, flags);
 	rcu_read_unlock();
 }

 void mem_cgroup_update_page_stat(struct page *page,
 				 enum mem_cgroup_stat_index idx,
 				 int val);

 static inline void mem_cgroup_inc_page_stat(struct page *page,
 					    enum mem_cgroup_stat_index idx)
 {
 	mem_cgroup_update_page_stat(page, idx, 1);
 }

 static inline void mem_cgroup_dec_page_stat(struct page *page,
 					    enum mem_cgroup_stat_index idx)
 {
 	mem_cgroup_update_page_stat(page, idx, -1);
 }

 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 						gfp_t gfp_mask,
 						unsigned long *total_scanned);

 void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
 static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
 					     enum vm_event_item idx)
 {
 	if (mem_cgroup_disabled())
 		return;
 	__mem_cgroup_count_vm_event(mm, idx);
 }
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 void mem_cgroup_split_huge_fixup(struct page *head);
 #endif

 #ifdef CONFIG_DEBUG_VM
 bool mem_cgroup_bad_page_check(struct page *page);
 void mem_cgroup_print_bad_page(struct page *page);
 #endif
 #else /* CONFIG_MEMCG */
 struct mem_cgroup;

 static inline int mem_cgroup_charge_anon(struct page *page,
 					struct mm_struct *mm, gfp_t gfp_mask)
 {
 	return 0;
 }

 static inline int mem_cgroup_charge_file(struct page *page,
 					struct mm_struct *mm, gfp_t gfp_mask)
 {
 	return 0;
 }

 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
 		struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp)
 {
 	return 0;
 }

 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
 					  struct mem_cgroup *memcg)
 {
 }

 static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
 {
 }

 static inline void mem_cgroup_uncharge_start(void)
 {
 }

 static inline void mem_cgroup_uncharge_end(void)
 {
 }

 static inline void mem_cgroup_uncharge_page(struct page *page)
 {
 }

 static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 {
 }

 static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
 						    struct mem_cgroup *memcg)
 {
 	return &zone->lruvec;
 }

 static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
 						    struct zone *zone)
 {
 	return &zone->lruvec;
 }

 static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
 {
 	return NULL;
 }

 static inline bool mm_match_cgroup(struct mm_struct *mm,
 		struct mem_cgroup *memcg)
 {
 	return true;
 }

 static inline bool task_in_mem_cgroup(struct task_struct *task,
 				      const struct mem_cgroup *memcg)
 {
 	return true;
 }

 static inline struct cgroup_subsys_state
 		*mem_cgroup_css(struct mem_cgroup *memcg)
 {
 	return NULL;
 }

 static inline void
 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
 			     struct mem_cgroup **memcgp)
 {
 }

 static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
 		struct page *oldpage, struct page *newpage, bool migration_ok)
 {
 }

 static inline struct mem_cgroup *
 mem_cgroup_iter(struct mem_cgroup *root,
 		struct mem_cgroup *prev,
 		struct mem_cgroup_reclaim_cookie *reclaim)
 {
 	return NULL;
 }

 static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
 					 struct mem_cgroup *prev)
 {
 }

 static inline bool mem_cgroup_disabled(void)
 {
 	return true;
 }

 static inline int
 mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
 {
 	return 1;
 }

 static inline unsigned long
 mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
 {
 	return 0;
 }

 static inline void
 mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
 			      int increment)
 {
 }

 static inline void
 mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
 {
 }

 static inline void mem_cgroup_begin_update_page_stat(struct page *page,
 					bool *locked, unsigned long *flags)
 {
 }

 static inline void mem_cgroup_end_update_page_stat(struct page *page,
 					bool *locked, unsigned long *flags)
 {
 }

 static inline void mem_cgroup_oom_enable(void)
 {
 }

 static inline void mem_cgroup_oom_disable(void)
 {
 }

 static inline bool task_in_memcg_oom(struct task_struct *p)
 {
 	return false;
 }

 static inline bool mem_cgroup_oom_synchronize(bool wait)
 {
 	return false;
 }

 static inline void mem_cgroup_inc_page_stat(struct page *page,
 					    enum mem_cgroup_stat_index idx)
 {
 }

 static inline void mem_cgroup_dec_page_stat(struct page *page,
 					    enum mem_cgroup_stat_index idx)
 {
 }

 static inline
 unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 					    gfp_t gfp_mask,
 					    unsigned long *total_scanned)
 {
 	return 0;
 }

 static inline void mem_cgroup_split_huge_fixup(struct page *head)
 {
 }

 static inline
 void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
 {
 }
 static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
 				struct page *newpage)
 {
 }
 #endif /* CONFIG_MEMCG */

 #if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM)
 static inline bool
 mem_cgroup_bad_page_check(struct page *page)
 {
 	return false;
 }

 static inline void
 mem_cgroup_print_bad_page(struct page *page)
 {
 }
 #endif

 enum {
 	UNDER_LIMIT,
 	SOFT_LIMIT,
 	OVER_LIMIT,
 };

 struct sock;
 #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
 void sock_update_memcg(struct sock *sk);
 void sock_release_memcg(struct sock *sk);
 #else
 static inline void sock_update_memcg(struct sock *sk)
 {
 }
 static inline void sock_release_memcg(struct sock *sk)
 {
 }
 #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */

 #ifdef CONFIG_MEMCG_KMEM
 extern struct static_key memcg_kmem_enabled_key;

 extern int memcg_limited_groups_array_size;

 /*
  * Helper macro to loop through all memcg-specific caches. Callers must still
  * check if the cache is valid (it is either valid or NULL).
  * the slab_mutex must be held when looping through those caches
  */
 #define for_each_memcg_cache_index(_idx)	\
 	for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++)

 static inline bool memcg_kmem_enabled(void)
 {
 	return static_key_false(&memcg_kmem_enabled_key);
 }

 /*
  * In general, we'll do everything in our power to not incur in any overhead
  * for non-memcg users for the kmem functions. Not even a function call, if we
  * can avoid it.
  *
  * Therefore, we'll inline all those functions so that in the best case, we'll
  * see that kmemcg is off for everybody and proceed quickly.  If it is on,
  * we'll still do most of the flag checking inline. We check a lot of
  * conditions, but because they are pretty simple, they are expected to be
  * fast.
  */
 bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
 					int order);
 void __memcg_kmem_commit_charge(struct page *page,
 				       struct mem_cgroup *memcg, int order);
 void __memcg_kmem_uncharge_pages(struct page *page, int order);

 int memcg_cache_id(struct mem_cgroup *memcg);

 int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
 			     struct kmem_cache *root_cache);
 void memcg_free_cache_params(struct kmem_cache *s);

 int memcg_update_cache_size(struct kmem_cache *s, int num_groups);
 void memcg_update_array_size(int num_groups);

 struct kmem_cache *
 __memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);

 int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order);
 void __memcg_uncharge_slab(struct kmem_cache *cachep, int order);

 int __kmem_cache_destroy_memcg_children(struct kmem_cache *s);

 /**
  * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
  * @gfp: the gfp allocation flags.
  * @memcg: a pointer to the memcg this was charged against.
  * @order: allocation order.
  *
  * returns true if the memcg where the current task belongs can hold this
  * allocation.
  *
  * We return true automatically if this allocation is not to be accounted to
  * any memcg.
  */
 static inline bool
 memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
 {
 	if (!memcg_kmem_enabled())
 		return true;

 	/*
 	 * __GFP_NOFAIL allocations will move on even if charging is not
 	 * possible. Therefore we don't even try, and have this allocation
 	 * unaccounted. We could in theory charge it with
 	 * res_counter_charge_nofail, but we hope those allocations are rare,
 	 * and won't be worth the trouble.
 	 */
 	if (gfp & __GFP_NOFAIL)
 		return true;
 	if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
 		return true;

 	/* If the test is dying, just let it go. */
 	if (unlikely(fatal_signal_pending(current)))
 		return true;

 	return __memcg_kmem_newpage_charge(gfp, memcg, order);
 }

 /**
  * memcg_kmem_uncharge_pages: uncharge pages from memcg
  * @page: pointer to struct page being freed
  * @order: allocation order.
  *
  * there is no need to specify memcg here, since it is embedded in page_cgroup
  */
 static inline void
 memcg_kmem_uncharge_pages(struct page *page, int order)
 {
 	if (memcg_kmem_enabled())
 		__memcg_kmem_uncharge_pages(page, order);
 }

 /**
  * memcg_kmem_commit_charge: embeds correct memcg in a page
  * @page: pointer to struct page recently allocated
  * @memcg: the memcg structure we charged against
  * @order: allocation order.
  *
  * Needs to be called after memcg_kmem_newpage_charge, regardless of success or
  * failure of the allocation. if @page is NULL, this function will revert the
  * charges. Otherwise, it will commit the memcg given by @memcg to the
  * corresponding page_cgroup.
  */
 static inline void
 memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
 {
 	if (memcg_kmem_enabled() && memcg)
 		__memcg_kmem_commit_charge(page, memcg, order);
 }

 /**
  * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation
  * @cachep: the original global kmem cache
  * @gfp: allocation flags.
  *
  * All memory allocated from a per-memcg cache is charged to the owner memcg.
  */
 static __always_inline struct kmem_cache *
 memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
 {
 	if (!memcg_kmem_enabled())
 		return cachep;
 	if (gfp & __GFP_NOFAIL)
 		return cachep;
 	if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
 		return cachep;
 	if (unlikely(fatal_signal_pending(current)))
 		return cachep;

 	return __memcg_kmem_get_cache(cachep, gfp);
 }
 #else
 #define for_each_memcg_cache_index(_idx)	\
 	for (; NULL; )

 static inline bool memcg_kmem_enabled(void)
 {
 	return false;
 }

 static inline bool
 memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
 {
 	return true;
 }

 static inline void memcg_kmem_uncharge_pages(struct page *page, int order)
 {
 }

 static inline void
 memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
 {
 }

 static inline int memcg_cache_id(struct mem_cgroup *memcg)
 {
 	return -1;
 }

 static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg,
 		struct kmem_cache *s, struct kmem_cache *root_cache)
 {
 	return 0;
 }

 static inline void memcg_free_cache_params(struct kmem_cache *s)
 {
 }

 static inline struct kmem_cache *
 memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
 {
 	return cachep;
 }
 #endif /* CONFIG_MEMCG_KMEM */
 #endif /* _LINUX_MEMCONTROL_H */
	/* memcontrol.h - Memory Controller
	*
	* Copyright IBM Corporation, 2007
	* Author Balbir Singh <balbir@linux.vnet.ibm.com>
	*
	* Copyright 2007 OpenVZ SWsoft Inc
	* Author: Pavel Emelianov <xemul@openvz.org>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#ifndef _LINUX_MEMCONTROL_H
	#define _LINUX_MEMCONTROL_H
	#include <linux/cgroup.h>
	#include <linux/vm_event_item.h>
	#include <linux/hardirq.h>
	#include <linux/jump_label.h>

	struct mem_cgroup;
	struct page_cgroup;
	struct page;
	struct mm_struct;
	struct kmem_cache;

	/*
	* The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c,
	* These two lists should keep in accord with each other.
	*/
	enum mem_cgroup_stat_index {
	/*
	* For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
	*/
	MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
	MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
	MEM_CGROUP_STAT_RSS_HUGE, /* # of pages charged as anon huge */
	MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
	MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */
	MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
	MEM_CGROUP_STAT_NSTATS,
	};

	struct mem_cgroup_reclaim_cookie {
	struct zone *zone;
	int priority;
	unsigned int generation;
	};

	#ifdef CONFIG_MEMCG
	/*
	* All "charge" functions with gfp_mask should use GFP_KERNEL or
	* (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
	* alloc memory but reclaims memory from all available zones. So, "where I want
	* memory from" bits of gfp_mask has no meaning. So any bits of that field is
	* available but adding a rule is better. charge functions' gfp_mask should
	* be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
	* codes.
	* (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
	*/

	extern int mem_cgroup_charge_anon(struct page page, struct mm_struct mm,
	gfp_t gfp_mask);
	/* for swap handling */
	extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
	struct page page, gfp_t mask, struct mem_cgroup *memcgp);
	extern void mem_cgroup_commit_charge_swapin(struct page *page,
	struct mem_cgroup *memcg);
	extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg);

	extern int mem_cgroup_charge_file(struct page page, struct mm_struct mm,
	gfp_t gfp_mask);

	struct lruvec mem_cgroup_zone_lruvec(struct zone , struct mem_cgroup *);
	struct lruvec mem_cgroup_page_lruvec(struct page , struct zone *);

	/* For coalescing uncharge for reducing memcg' overhead*/
	extern void mem_cgroup_uncharge_start(void);
	extern void mem_cgroup_uncharge_end(void);

	extern void mem_cgroup_uncharge_page(struct page *page);
	extern void mem_cgroup_uncharge_cache_page(struct page *page);

	bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
	struct mem_cgroup *memcg);
	bool task_in_mem_cgroup(struct task_struct *task,
	const struct mem_cgroup *memcg);

	extern struct mem_cgroup try_get_mem_cgroup_from_page(struct page page);
	extern struct mem_cgroup mem_cgroup_from_task(struct task_struct p);

	extern struct mem_cgroup parent_mem_cgroup(struct mem_cgroup memcg);
	extern struct mem_cgroup mem_cgroup_from_css(struct cgroup_subsys_state css);

	static inline
	bool mm_match_cgroup(const struct mm_struct mm, const struct mem_cgroup memcg)
	{
	struct mem_cgroup *task_memcg;
	bool match;

	rcu_read_lock();
	task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
	match = __mem_cgroup_same_or_subtree(memcg, task_memcg);
	rcu_read_unlock();
	return match;
	}

	extern struct cgroup_subsys_state mem_cgroup_css(struct mem_cgroup memcg);

	extern void
	mem_cgroup_prepare_migration(struct page page, struct page newpage,
	struct mem_cgroup **memcgp);
	extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
	struct page oldpage, struct page newpage, bool migration_ok);

	struct mem_cgroup mem_cgroup_iter(struct mem_cgroup ,
	struct mem_cgroup *,
	struct mem_cgroup_reclaim_cookie *);
	void mem_cgroup_iter_break(struct mem_cgroup , struct mem_cgroup );

	/*
	* For memory reclaim.
	*/
	int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec);
	int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
	unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
	void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
	extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
	struct task_struct *p);
	extern void mem_cgroup_replace_page_cache(struct page *oldpage,
	struct page *newpage);

	static inline void mem_cgroup_oom_enable(void)
	{
	WARN_ON(current->memcg_oom.may_oom);
	current->memcg_oom.may_oom = 1;
	}

	static inline void mem_cgroup_oom_disable(void)
	{
	WARN_ON(!current->memcg_oom.may_oom);
	current->memcg_oom.may_oom = 0;
	}

	static inline bool task_in_memcg_oom(struct task_struct *p)
	{
	return p->memcg_oom.memcg;
	}

	bool mem_cgroup_oom_synchronize(bool wait);

	#ifdef CONFIG_MEMCG_SWAP
	extern int do_swap_account;
	#endif

	static inline bool mem_cgroup_disabled(void)
	{
	if (memory_cgrp_subsys.disabled)
	return true;
	return false;
	}

	void __mem_cgroup_begin_update_page_stat(struct page page, bool locked,
	unsigned long *flags);

	extern atomic_t memcg_moving;

	static inline void mem_cgroup_begin_update_page_stat(struct page *page,
	bool locked, unsigned long flags)
	{
	if (mem_cgroup_disabled())
	return;
	rcu_read_lock();
	*locked = false;
	if (atomic_read(&memcg_moving))
	__mem_cgroup_begin_update_page_stat(page, locked, flags);
	}

	void __mem_cgroup_end_update_page_stat(struct page *page,
	unsigned long *flags);
	static inline void mem_cgroup_end_update_page_stat(struct page *page,
	bool locked, unsigned long flags)
	{
	if (mem_cgroup_disabled())
	return;
	if (*locked)
	__mem_cgroup_end_update_page_stat(page, flags);
	rcu_read_unlock();
	}

	void mem_cgroup_update_page_stat(struct page *page,
	enum mem_cgroup_stat_index idx,
	int val);

	static inline void mem_cgroup_inc_page_stat(struct page *page,
	enum mem_cgroup_stat_index idx)
	{
	mem_cgroup_update_page_stat(page, idx, 1);
	}

	static inline void mem_cgroup_dec_page_stat(struct page *page,
	enum mem_cgroup_stat_index idx)
	{
	mem_cgroup_update_page_stat(page, idx, -1);
	}

	unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
	gfp_t gfp_mask,
	unsigned long *total_scanned);

	void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
	static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
	enum vm_event_item idx)
	{
	if (mem_cgroup_disabled())
	return;
	__mem_cgroup_count_vm_event(mm, idx);
	}
	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	void mem_cgroup_split_huge_fixup(struct page *head);
	#endif

	#ifdef CONFIG_DEBUG_VM
	bool mem_cgroup_bad_page_check(struct page *page);
	void mem_cgroup_print_bad_page(struct page *page);
	#endif
	#else /* CONFIG_MEMCG */
	struct mem_cgroup;

	static inline int mem_cgroup_charge_anon(struct page *page,
	struct mm_struct *mm, gfp_t gfp_mask)
	{
	return 0;
	}

	static inline int mem_cgroup_charge_file(struct page *page,
	struct mm_struct *mm, gfp_t gfp_mask)
	{
	return 0;
	}

	static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
	struct page page, gfp_t gfp_mask, struct mem_cgroup *memcgp)
	{
	return 0;
	}

	static inline void mem_cgroup_commit_charge_swapin(struct page *page,
	struct mem_cgroup *memcg)
	{
	}

	static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
	{
	}

	static inline void mem_cgroup_uncharge_start(void)
	{
	}

	static inline void mem_cgroup_uncharge_end(void)
	{
	}

	static inline void mem_cgroup_uncharge_page(struct page *page)
	{
	}

	static inline void mem_cgroup_uncharge_cache_page(struct page *page)
	{
	}

	static inline struct lruvec mem_cgroup_zone_lruvec(struct zone zone,
	struct mem_cgroup *memcg)
	{
	return &zone->lruvec;
	}

	static inline struct lruvec mem_cgroup_page_lruvec(struct page page,
	struct zone *zone)
	{
	return &zone->lruvec;
	}

	static inline struct mem_cgroup try_get_mem_cgroup_from_page(struct page page)
	{
	return NULL;
	}

	static inline bool mm_match_cgroup(struct mm_struct *mm,
	struct mem_cgroup *memcg)
	{
	return true;
	}

	static inline bool task_in_mem_cgroup(struct task_struct *task,
	const struct mem_cgroup *memcg)
	{
	return true;
	}

	static inline struct cgroup_subsys_state
	mem_cgroup_css(struct mem_cgroup memcg)
	{
	return NULL;
	}

	static inline void
	mem_cgroup_prepare_migration(struct page page, struct page newpage,
	struct mem_cgroup **memcgp)
	{
	}

	static inline void mem_cgroup_end_migration(struct mem_cgroup *memcg,
	struct page oldpage, struct page newpage, bool migration_ok)
	{
	}

	static inline struct mem_cgroup *
	mem_cgroup_iter(struct mem_cgroup *root,
	struct mem_cgroup *prev,
	struct mem_cgroup_reclaim_cookie *reclaim)
	{
	return NULL;
	}

	static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
	struct mem_cgroup *prev)
	{
	}

	static inline bool mem_cgroup_disabled(void)
	{
	return true;
	}

	static inline int
	mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
	{
	return 1;
	}

	static inline unsigned long
	mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
	{
	return 0;
	}

	static inline void
	mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
	int increment)
	{
	}

	static inline void
	mem_cgroup_print_oom_info(struct mem_cgroup memcg, struct task_struct p)
	{
	}

	static inline void mem_cgroup_begin_update_page_stat(struct page *page,
	bool locked, unsigned long flags)
	{
	}

	static inline void mem_cgroup_end_update_page_stat(struct page *page,
	bool locked, unsigned long flags)
	{
	}

	static inline void mem_cgroup_oom_enable(void)
	{
	}

	static inline void mem_cgroup_oom_disable(void)
	{
	}

	static inline bool task_in_memcg_oom(struct task_struct *p)
	{
	return false;
	}

	static inline bool mem_cgroup_oom_synchronize(bool wait)
	{
	return false;
	}

	static inline void mem_cgroup_inc_page_stat(struct page *page,
	enum mem_cgroup_stat_index idx)
	{
	}

	static inline void mem_cgroup_dec_page_stat(struct page *page,
	enum mem_cgroup_stat_index idx)
	{
	}

	static inline
	unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
	gfp_t gfp_mask,
	unsigned long *total_scanned)
	{
	return 0;
	}

	static inline void mem_cgroup_split_huge_fixup(struct page *head)
	{
	}

	static inline
	void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
	{
	}
	static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
	struct page *newpage)
	{
	}
	#endif /* CONFIG_MEMCG */

	#if !defined(CONFIG_MEMCG) \|\| !defined(CONFIG_DEBUG_VM)
	static inline bool
	mem_cgroup_bad_page_check(struct page *page)
	{
	return false;
	}

	static inline void
	mem_cgroup_print_bad_page(struct page *page)
	{
	}
	#endif

	enum {
	UNDER_LIMIT,
	SOFT_LIMIT,
	OVER_LIMIT,
	};

	struct sock;
	#if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
	void sock_update_memcg(struct sock *sk);
	void sock_release_memcg(struct sock *sk);
	#else
	static inline void sock_update_memcg(struct sock *sk)
	{
	}
	static inline void sock_release_memcg(struct sock *sk)
	{
	}
	#endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */

	#ifdef CONFIG_MEMCG_KMEM
	extern struct static_key memcg_kmem_enabled_key;

	extern int memcg_limited_groups_array_size;

	/*
	* Helper macro to loop through all memcg-specific caches. Callers must still
	* check if the cache is valid (it is either valid or NULL).
	* the slab_mutex must be held when looping through those caches
	*/
	#define for_each_memcg_cache_index(_idx) \
	for ((_idx) = 0; (_idx) < memcg_limited_groups_array_size; (_idx)++)

	static inline bool memcg_kmem_enabled(void)
	{
	return static_key_false(&memcg_kmem_enabled_key);
	}

	/*
	* In general, we'll do everything in our power to not incur in any overhead
	* for non-memcg users for the kmem functions. Not even a function call, if we
	* can avoid it.
	*
	* Therefore, we'll inline all those functions so that in the best case, we'll
	* see that kmemcg is off for everybody and proceed quickly. If it is on,
	* we'll still do most of the flag checking inline. We check a lot of
	* conditions, but because they are pretty simple, they are expected to be
	* fast.
	*/
	bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
	int order);
	void __memcg_kmem_commit_charge(struct page *page,
	struct mem_cgroup *memcg, int order);
	void __memcg_kmem_uncharge_pages(struct page *page, int order);

	int memcg_cache_id(struct mem_cgroup *memcg);

	int memcg_alloc_cache_params(struct mem_cgroup memcg, struct kmem_cache s,
	struct kmem_cache *root_cache);
	void memcg_free_cache_params(struct kmem_cache *s);

	int memcg_update_cache_size(struct kmem_cache *s, int num_groups);
	void memcg_update_array_size(int num_groups);

	struct kmem_cache *
	__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);

	int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order);
	void __memcg_uncharge_slab(struct kmem_cache *cachep, int order);

	int __kmem_cache_destroy_memcg_children(struct kmem_cache *s);

	/**
	* memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
	* @gfp: the gfp allocation flags.
	* @memcg: a pointer to the memcg this was charged against.
	* @order: allocation order.
	*
	* returns true if the memcg where the current task belongs can hold this
	* allocation.
	*
	* We return true automatically if this allocation is not to be accounted to
	* any memcg.
	*/
	static inline bool
	memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
	{
	if (!memcg_kmem_enabled())
	return true;

	/*
	* __GFP_NOFAIL allocations will move on even if charging is not
	* possible. Therefore we don't even try, and have this allocation
	* unaccounted. We could in theory charge it with
	* res_counter_charge_nofail, but we hope those allocations are rare,
	* and won't be worth the trouble.
	*/
	if (gfp & __GFP_NOFAIL)
	return true;
	if (in_interrupt() \|\| (!current->mm) \|\| (current->flags & PF_KTHREAD))
	return true;

	/* If the test is dying, just let it go. */
	if (unlikely(fatal_signal_pending(current)))
	return true;

	return __memcg_kmem_newpage_charge(gfp, memcg, order);
	}

	/**
	* memcg_kmem_uncharge_pages: uncharge pages from memcg
	* @page: pointer to struct page being freed
	* @order: allocation order.
	*
	* there is no need to specify memcg here, since it is embedded in page_cgroup
	*/
	static inline void
	memcg_kmem_uncharge_pages(struct page *page, int order)
	{
	if (memcg_kmem_enabled())
	__memcg_kmem_uncharge_pages(page, order);
	}

	/**
	* memcg_kmem_commit_charge: embeds correct memcg in a page
	* @page: pointer to struct page recently allocated
	* @memcg: the memcg structure we charged against
	* @order: allocation order.
	*
	* Needs to be called after memcg_kmem_newpage_charge, regardless of success or
	* failure of the allocation. if @page is NULL, this function will revert the
	* charges. Otherwise, it will commit the memcg given by @memcg to the
	* corresponding page_cgroup.
	*/
	static inline void
	memcg_kmem_commit_charge(struct page page, struct mem_cgroup memcg, int order)
	{
	if (memcg_kmem_enabled() && memcg)
	__memcg_kmem_commit_charge(page, memcg, order);
	}

	/**
	* memcg_kmem_get_cache: selects the correct per-memcg cache for allocation
	* @cachep: the original global kmem cache
	* @gfp: allocation flags.
	*
	* All memory allocated from a per-memcg cache is charged to the owner memcg.
	*/
	static __always_inline struct kmem_cache *
	memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
	{
	if (!memcg_kmem_enabled())
	return cachep;
	if (gfp & __GFP_NOFAIL)
	return cachep;
	if (in_interrupt() \|\| (!current->mm) \|\| (current->flags & PF_KTHREAD))
	return cachep;
	if (unlikely(fatal_signal_pending(current)))
	return cachep;

	return __memcg_kmem_get_cache(cachep, gfp);
	}
	#else
	#define for_each_memcg_cache_index(_idx) \
	for (; NULL; )

	static inline bool memcg_kmem_enabled(void)
	{
	return false;
	}

	static inline bool
	memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
	{
	return true;
	}

	static inline void memcg_kmem_uncharge_pages(struct page *page, int order)
	{
	}

	static inline void
	memcg_kmem_commit_charge(struct page page, struct mem_cgroup memcg, int order)
	{
	}

	static inline int memcg_cache_id(struct mem_cgroup *memcg)
	{
	return -1;
	}

	static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg,
	struct kmem_cache s, struct kmem_cache root_cache)
	{
	return 0;
	}

	static inline void memcg_free_cache_params(struct kmem_cache *s)
	{
	}

	static inline struct kmem_cache *
	memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
	{
	return cachep;
	}
	#endif /* CONFIG_MEMCG_KMEM */
	#endif /* _LINUX_MEMCONTROL_H */