include/linux/memcontrol.h - kernel/msm-5.4 - 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>

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

 /* Stats that can be updated by kernel. */
 enum mem_cgroup_page_stat_item {
 	MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
 };

 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_newpage_charge(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_cache_charge(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);
 int 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 *try_get_mem_cgroup_from_mm(struct mm_struct *mm);

 extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
 extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);

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

 	rcu_read_lock();
 	memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner));
 	match = __mem_cgroup_same_or_subtree(cgroup, 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_inactive_file_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);

 #ifdef CONFIG_MEMCG_SWAP
 extern int do_swap_account;
 #endif

 static inline bool mem_cgroup_disabled(void)
 {
 	if (mem_cgroup_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_page_stat_item idx,
 				 int val);

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

 static inline void mem_cgroup_dec_page_stat(struct page *page,
 					    enum mem_cgroup_page_stat_item 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);
 #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_newpage_charge(struct page *page,
 					struct mm_struct *mm, gfp_t gfp_mask)
 {
 	return 0;
 }

 static inline int mem_cgroup_cache_charge(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 struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 {
 	return NULL;
 }

 static inline int mm_match_cgroup(struct mm_struct *mm,
 		struct mem_cgroup *memcg)
 {
 	return 1;
 }

 static inline int task_in_mem_cgroup(struct task_struct *task,
 				     const struct mem_cgroup *memcg)
 {
 	return 1;
 }

 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 int
 mem_cgroup_inactive_file_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_inc_page_stat(struct page *page,
 					    enum mem_cgroup_page_stat_item idx)
 {
 }

 static inline void mem_cgroup_dec_page_stat(struct page *page,
 					    enum mem_cgroup_page_stat_item 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;
 #ifdef 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_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>

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

	/* Stats that can be updated by kernel. */
	enum mem_cgroup_page_stat_item {
	MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
	};

	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_newpage_charge(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_cache_charge(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);
	int 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 try_get_mem_cgroup_from_mm(struct mm_struct mm);

	extern struct mem_cgroup parent_mem_cgroup(struct mem_cgroup memcg);
	extern struct mem_cgroup mem_cgroup_from_cont(struct cgroup cont);

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

	rcu_read_lock();
	memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner));
	match = __mem_cgroup_same_or_subtree(cgroup, 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_inactive_file_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);

	#ifdef CONFIG_MEMCG_SWAP
	extern int do_swap_account;
	#endif

	static inline bool mem_cgroup_disabled(void)
	{
	if (mem_cgroup_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_page_stat_item idx,
	int val);

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

	static inline void mem_cgroup_dec_page_stat(struct page *page,
	enum mem_cgroup_page_stat_item 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);
	#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_newpage_charge(struct page *page,
	struct mm_struct *mm, gfp_t gfp_mask)
	{
	return 0;
	}

	static inline int mem_cgroup_cache_charge(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 struct mem_cgroup try_get_mem_cgroup_from_mm(struct mm_struct mm)
	{
	return NULL;
	}

	static inline int mm_match_cgroup(struct mm_struct *mm,
	struct mem_cgroup *memcg)
	{
	return 1;
	}

	static inline int task_in_mem_cgroup(struct task_struct *task,
	const struct mem_cgroup *memcg)
	{
	return 1;
	}

	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 int
	mem_cgroup_inactive_file_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_inc_page_stat(struct page *page,
	enum mem_cgroup_page_stat_item idx)
	{
	}

	static inline void mem_cgroup_dec_page_stat(struct page *page,
	enum mem_cgroup_page_stat_item 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;
	#ifdef 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_MEMCG_KMEM */
	#endif /* _LINUX_MEMCONTROL_H */