memcontrol.h 11.4 KB
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/* memcontrol.h - Memory Controller
 *
 * Copyright IBM Corporation, 2007
 * Author Balbir Singh <balbir@linux.vnet.ibm.com>
 *
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 * Copyright 2007 OpenVZ SWsoft Inc
 * Author: Pavel Emelianov <xemul@openvz.org>
 *
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 * 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
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#include <linux/cgroup.h>
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#include <linux/vm_event_item.h>

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

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

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#ifdef CONFIG_CGROUP_MEM_RES_CTLR
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/*
 * 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.)
 */
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extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
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				gfp_t gfp_mask);
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/* for swap handling */
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extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
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		struct page *page, gfp_t mask, struct mem_cgroup **memcgp);
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extern void mem_cgroup_commit_charge_swapin(struct page *page,
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					struct mem_cgroup *memcg);
extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg);
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extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
					gfp_t gfp_mask);
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struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
struct lruvec *mem_cgroup_lru_add_list(struct zone *, struct page *,
				       enum lru_list);
void mem_cgroup_lru_del_list(struct page *, enum lru_list);
struct lruvec *mem_cgroup_lru_move_lists(struct zone *, struct page *,
					 enum lru_list, enum lru_list);
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/* For coalescing uncharge for reducing memcg' overhead*/
extern void mem_cgroup_uncharge_start(void);
extern void mem_cgroup_uncharge_end(void);

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extern void mem_cgroup_uncharge_page(struct page *page);
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extern void mem_cgroup_uncharge_cache_page(struct page *page);
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extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
				     int order);
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bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
				  struct mem_cgroup *memcg);
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int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg);
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extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
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extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
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extern struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm);
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extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
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extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
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static inline
int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
{
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	struct mem_cgroup *memcg;
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	int match;

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	rcu_read_lock();
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	memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner));
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	match = __mem_cgroup_same_or_subtree(cgroup, memcg);
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	rcu_read_unlock();
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	return match;
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}
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extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
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extern int
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mem_cgroup_prepare_migration(struct page *page,
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	struct page *newpage, struct mem_cgroup **memcgp, gfp_t gfp_mask);
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extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
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	struct page *oldpage, struct page *newpage, bool migration_ok);
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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 *);

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/*
 * For memory reclaim.
 */
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int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg,
				    struct zone *zone);
int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg,
				    struct zone *zone);
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int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
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unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
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					int nid, int zid, unsigned int lrumask);
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struct zone_reclaim_stat*
mem_cgroup_get_reclaim_stat_from_page(struct page *page);
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extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
					struct task_struct *p);
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extern void mem_cgroup_replace_page_cache(struct page *oldpage,
					struct page *newpage);
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#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
extern int do_swap_account;
#endif
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static inline bool mem_cgroup_disabled(void)
{
	if (mem_cgroup_subsys.disabled)
		return true;
	return false;
}

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

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extern atomic_t memcg_moving;

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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;
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	if (atomic_read(&memcg_moving))
		__mem_cgroup_begin_update_page_stat(page, locked, flags);
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}

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();
}

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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);
}

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unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
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						gfp_t gfp_mask,
						unsigned long *total_scanned);
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u64 mem_cgroup_get_limit(struct mem_cgroup *memcg);
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void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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void mem_cgroup_split_huge_fixup(struct page *head);
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#endif

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

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

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

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

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

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

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static inline void mem_cgroup_uncharge_start(void)
{
}

static inline void mem_cgroup_uncharge_end(void)
{
}

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

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

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

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static inline struct lruvec *mem_cgroup_lru_add_list(struct zone *zone,
						     struct page *page,
						     enum lru_list lru)
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{
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	return &zone->lruvec;
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}

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static inline void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru)
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{
}

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static inline struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone,
						       struct page *page,
						       enum lru_list from,
						       enum lru_list to)
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{
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	return &zone->lruvec;
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}

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

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

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

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

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

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static inline int
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mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
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	struct mem_cgroup **memcgp, gfp_t gfp_mask)
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{
	return 0;
}

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

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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)
{
}

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static inline bool mem_cgroup_disabled(void)
{
	return true;
}
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static inline int
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mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
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{
	return 1;
}

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static inline int
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mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
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{
	return 1;
}

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static inline unsigned long
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mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
				unsigned int lru_mask)
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{
	return 0;
}

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static inline struct zone_reclaim_stat*
mem_cgroup_get_reclaim_stat_from_page(struct page *page)
{
	return NULL;
}

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

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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)
{
}

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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)
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{
}

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

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static inline
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u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
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{
	return 0;
}

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

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static inline
void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
{
}
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static inline void mem_cgroup_replace_page_cache(struct page *oldpage,
				struct page *newpage)
{
}
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#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
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#if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !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

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enum {
	UNDER_LIMIT,
	SOFT_LIMIT,
	OVER_LIMIT,
};

struct sock;
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_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_CGROUP_MEM_RES_CTLR_KMEM */
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#endif /* _LINUX_MEMCONTROL_H */
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