linux/include/linux/memcontrol.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/* memcontrol.h - Memory Controller
 *
 * Copyright IBM Corporation, 2007
 * Author Balbir Singh <[email protected]>
 *
 * Copyright 2007 OpenVZ SWsoft Inc
 * Author: Pavel Emelianov <[email protected]>
 */

#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>
#include <linux/kernel.h>
#include <linux/page_counter.h>
#include <linux/vmpressure.h>
#include <linux/eventfd.h>
#include <linux/mm.h>
#include <linux/vmstat.h>
#include <linux/writeback.h>
#include <linux/page-flags.h>
#include <linux/shrinker.h>

struct mem_cgroup;
struct obj_cgroup;
struct page;
struct mm_struct;
struct kmem_cache;

/* Cgroup-specific page state, on top of universal node page state */
enum memcg_stat_item {};

enum memcg_memory_event {};

struct mem_cgroup_reclaim_cookie {};

#ifdef CONFIG_MEMCG

#define MEM_CGROUP_ID_SHIFT

struct mem_cgroup_id {};

struct memcg_vmstats_percpu;
struct memcg1_events_percpu;
struct memcg_vmstats;
struct lruvec_stats_percpu;
struct lruvec_stats;

struct mem_cgroup_reclaim_iter {};

/*
 * per-node information in memory controller.
 */
struct mem_cgroup_per_node {};

struct mem_cgroup_threshold {};

/* For threshold */
struct mem_cgroup_threshold_ary {};

struct mem_cgroup_thresholds {};

/*
 * Remember four most recent foreign writebacks with dirty pages in this
 * cgroup.  Inode sharing is expected to be uncommon and, even if we miss
 * one in a given round, we're likely to catch it later if it keeps
 * foreign-dirtying, so a fairly low count should be enough.
 *
 * See mem_cgroup_track_foreign_dirty_slowpath() for details.
 */
#define MEMCG_CGWB_FRN_CNT

struct memcg_cgwb_frn {};

/*
 * Bucket for arbitrarily byte-sized objects charged to a memory
 * cgroup. The bucket can be reparented in one piece when the cgroup
 * is destroyed, without having to round up the individual references
 * of all live memory objects in the wild.
 */
struct obj_cgroup {};

/*
 * The memory controller data structure. The memory controller controls both
 * page cache and RSS per cgroup. We would eventually like to provide
 * statistics based on the statistics developed by Rik Van Riel for clock-pro,
 * to help the administrator determine what knobs to tune.
 */
struct mem_cgroup {};

/*
 * size of first charge trial.
 * TODO: maybe necessary to use big numbers in big irons or dynamic based of the
 * workload.
 */
#define MEMCG_CHARGE_BATCH

extern struct mem_cgroup *root_mem_cgroup;

enum page_memcg_data_flags {};

#define __FIRST_OBJEXT_FLAG

#else /* CONFIG_MEMCG */

#define __FIRST_OBJEXT_FLAG

#endif /* CONFIG_MEMCG */

enum objext_flags {};

#define OBJEXTS_FLAGS_MASK

#ifdef CONFIG_MEMCG

static inline bool folio_memcg_kmem(struct folio *folio);

/*
 * After the initialization objcg->memcg is always pointing at
 * a valid memcg, but can be atomically swapped to the parent memcg.
 *
 * The caller must ensure that the returned memcg won't be released.
 */
static inline struct mem_cgroup *obj_cgroup_memcg(struct obj_cgroup *objcg)
{}

/*
 * __folio_memcg - Get the memory cgroup associated with a non-kmem folio
 * @folio: Pointer to the folio.
 *
 * Returns a pointer to the memory cgroup associated with the folio,
 * or NULL. This function assumes that the folio is known to have a
 * proper memory cgroup pointer. It's not safe to call this function
 * against some type of folios, e.g. slab folios or ex-slab folios or
 * kmem folios.
 */
static inline struct mem_cgroup *__folio_memcg(struct folio *folio)
{}

/*
 * __folio_objcg - get the object cgroup associated with a kmem folio.
 * @folio: Pointer to the folio.
 *
 * Returns a pointer to the object cgroup associated with the folio,
 * or NULL. This function assumes that the folio is known to have a
 * proper object cgroup pointer. It's not safe to call this function
 * against some type of folios, e.g. slab folios or ex-slab folios or
 * LRU folios.
 */
static inline struct obj_cgroup *__folio_objcg(struct folio *folio)
{}

/*
 * folio_memcg - Get the memory cgroup associated with a folio.
 * @folio: Pointer to the folio.
 *
 * Returns a pointer to the memory cgroup associated with the folio,
 * or NULL. This function assumes that the folio is known to have a
 * proper memory cgroup pointer. It's not safe to call this function
 * against some type of folios, e.g. slab folios or ex-slab folios.
 *
 * For a non-kmem folio any of the following ensures folio and memcg binding
 * stability:
 *
 * - the folio lock
 * - LRU isolation
 * - folio_memcg_lock()
 * - exclusive reference
 * - mem_cgroup_trylock_pages()
 *
 * For a kmem folio a caller should hold an rcu read lock to protect memcg
 * associated with a kmem folio from being released.
 */
static inline struct mem_cgroup *folio_memcg(struct folio *folio)
{}

/*
 * folio_memcg_charged - If a folio is charged to a memory cgroup.
 * @folio: Pointer to the folio.
 *
 * Returns true if folio is charged to a memory cgroup, otherwise returns false.
 */
static inline bool folio_memcg_charged(struct folio *folio)
{}

/**
 * folio_memcg_rcu - Locklessly get the memory cgroup associated with a folio.
 * @folio: Pointer to the folio.
 *
 * This function assumes that the folio is known to have a
 * proper memory cgroup pointer. It's not safe to call this function
 * against some type of folios, e.g. slab folios or ex-slab folios.
 *
 * Return: A pointer to the memory cgroup associated with the folio,
 * or NULL.
 */
static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio)
{}

/*
 * folio_memcg_check - Get the memory cgroup associated with a folio.
 * @folio: Pointer to the folio.
 *
 * Returns a pointer to the memory cgroup associated with the folio,
 * or NULL. This function unlike folio_memcg() can take any folio
 * as an argument. It has to be used in cases when it's not known if a folio
 * has an associated memory cgroup pointer or an object cgroups vector or
 * an object cgroup.
 *
 * For a non-kmem folio any of the following ensures folio and memcg binding
 * stability:
 *
 * - the folio lock
 * - LRU isolation
 * - lock_folio_memcg()
 * - exclusive reference
 * - mem_cgroup_trylock_pages()
 *
 * For a kmem folio a caller should hold an rcu read lock to protect memcg
 * associated with a kmem folio from being released.
 */
static inline struct mem_cgroup *folio_memcg_check(struct folio *folio)
{}

static inline struct mem_cgroup *page_memcg_check(struct page *page)
{}

static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg)
{}

/*
 * folio_memcg_kmem - Check if the folio has the memcg_kmem flag set.
 * @folio: Pointer to the folio.
 *
 * Checks if the folio has MemcgKmem flag set. The caller must ensure
 * that the folio has an associated memory cgroup. It's not safe to call
 * this function against some types of folios, e.g. slab folios.
 */
static inline bool folio_memcg_kmem(struct folio *folio)
{}

static inline bool PageMemcgKmem(struct page *page)
{}

static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
{}

static inline bool mem_cgroup_disabled(void)
{}

static inline void mem_cgroup_protection(struct mem_cgroup *root,
					 struct mem_cgroup *memcg,
					 unsigned long *min,
					 unsigned long *low)
{}

void mem_cgroup_calculate_protection(struct mem_cgroup *root,
				     struct mem_cgroup *memcg);

static inline bool mem_cgroup_unprotected(struct mem_cgroup *target,
					  struct mem_cgroup *memcg)
{}

static inline bool mem_cgroup_below_low(struct mem_cgroup *target,
					struct mem_cgroup *memcg)
{}

static inline bool mem_cgroup_below_min(struct mem_cgroup *target,
					struct mem_cgroup *memcg)
{}

void mem_cgroup_commit_charge(struct folio *folio, struct mem_cgroup *memcg);

int __mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp);

/**
 * mem_cgroup_charge - Charge a newly allocated folio to a cgroup.
 * @folio: Folio to charge.
 * @mm: mm context of the allocating task.
 * @gfp: Reclaim mode.
 *
 * Try to charge @folio to the memcg that @mm belongs to, reclaiming
 * pages according to @gfp if necessary.  If @mm is NULL, try to
 * charge to the active memcg.
 *
 * Do not use this for folios allocated for swapin.
 *
 * Return: 0 on success. Otherwise, an error code is returned.
 */
static inline int mem_cgroup_charge(struct folio *folio, struct mm_struct *mm,
				    gfp_t gfp)
{}

int mem_cgroup_hugetlb_try_charge(struct mem_cgroup *memcg, gfp_t gfp,
		long nr_pages);

int mem_cgroup_swapin_charge_folio(struct folio *folio, struct mm_struct *mm,
				  gfp_t gfp, swp_entry_t entry);

void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry, unsigned int nr_pages);

void __mem_cgroup_uncharge(struct folio *folio);

/**
 * mem_cgroup_uncharge - Uncharge a folio.
 * @folio: Folio to uncharge.
 *
 * Uncharge a folio previously charged with mem_cgroup_charge().
 */
static inline void mem_cgroup_uncharge(struct folio *folio)
{}

void __mem_cgroup_uncharge_folios(struct folio_batch *folios);
static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios)
{}

void mem_cgroup_cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages);
void mem_cgroup_replace_folio(struct folio *old, struct folio *new);
void mem_cgroup_migrate(struct folio *old, struct folio *new);

/**
 * mem_cgroup_lruvec - get the lru list vector for a memcg & node
 * @memcg: memcg of the wanted lruvec
 * @pgdat: pglist_data
 *
 * Returns the lru list vector holding pages for a given @memcg &
 * @pgdat combination. This can be the node lruvec, if the memory
 * controller is disabled.
 */
static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
					       struct pglist_data *pgdat)
{}

/**
 * folio_lruvec - return lruvec for isolating/putting an LRU folio
 * @folio: Pointer to the folio.
 *
 * This function relies on folio->mem_cgroup being stable.
 */
static inline struct lruvec *folio_lruvec(struct folio *folio)
{}

struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);

struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm);

struct mem_cgroup *get_mem_cgroup_from_current(void);

struct mem_cgroup *get_mem_cgroup_from_folio(struct folio *folio);

struct lruvec *folio_lruvec_lock(struct folio *folio);
struct lruvec *folio_lruvec_lock_irq(struct folio *folio);
struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio,
						unsigned long *flags);

#ifdef CONFIG_DEBUG_VM
void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio);
#else
static inline
void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio)
{
}
#endif

static inline
struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){}

static inline bool obj_cgroup_tryget(struct obj_cgroup *objcg)
{}

static inline void obj_cgroup_get(struct obj_cgroup *objcg)
{}

static inline void obj_cgroup_get_many(struct obj_cgroup *objcg,
				       unsigned long nr)
{}

static inline void obj_cgroup_put(struct obj_cgroup *objcg)
{}

static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg)
{}

static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
{}

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

#define mem_cgroup_from_counter(counter, member)

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 *);
void mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
			   int (*)(struct task_struct *, void *), void *arg);

static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
{}
struct mem_cgroup *mem_cgroup_from_id(unsigned short id);

#ifdef CONFIG_SHRINKER_DEBUG
static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg)
{}

struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino);
#endif

static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
{}

static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
{}

/**
 * parent_mem_cgroup - find the accounting parent of a memcg
 * @memcg: memcg whose parent to find
 *
 * Returns the parent memcg, or NULL if this is the root.
 */
static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
{}

static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
			      struct mem_cgroup *root)
{}

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

struct cgroup_subsys_state *mem_cgroup_css_from_folio(struct folio *folio);
ino_t page_cgroup_ino(struct page *page);

static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
{}

void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
		int zid, int nr_pages);

static inline
unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec,
		enum lru_list lru, int zone_idx)
{}

void mem_cgroup_handle_over_high(gfp_t gfp_mask);

unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg);

unsigned long mem_cgroup_size(struct mem_cgroup *memcg);

void mem_cgroup_print_oom_context(struct mem_cgroup *memcg,
				struct task_struct *p);

void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg);

struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim,
					    struct mem_cgroup *oom_domain);
void mem_cgroup_print_oom_group(struct mem_cgroup *memcg);

void __mod_memcg_state(struct mem_cgroup *memcg, enum memcg_stat_item idx,
		       int val);

/* idx can be of type enum memcg_stat_item or node_stat_item */
static inline void mod_memcg_state(struct mem_cgroup *memcg,
				   enum memcg_stat_item idx, int val)
{}

static inline void mod_memcg_page_state(struct page *page,
					enum memcg_stat_item idx, int val)
{}

unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx);
unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx);
unsigned long lruvec_page_state_local(struct lruvec *lruvec,
				      enum node_stat_item idx);

void mem_cgroup_flush_stats(struct mem_cgroup *memcg);
void mem_cgroup_flush_stats_ratelimited(struct mem_cgroup *memcg);

void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val);

static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
					 int val)
{}

void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
			  unsigned long count);

static inline void count_memcg_events(struct mem_cgroup *memcg,
				      enum vm_event_item idx,
				      unsigned long count)
{}

static inline void count_memcg_folio_events(struct folio *folio,
		enum vm_event_item idx, unsigned long nr)
{}

static inline void count_memcg_events_mm(struct mm_struct *mm,
					enum vm_event_item idx, unsigned long count)
{}

static inline void count_memcg_event_mm(struct mm_struct *mm,
					enum vm_event_item idx)
{}

static inline void memcg_memory_event(struct mem_cgroup *memcg,
				      enum memcg_memory_event event)
{}

static inline void memcg_memory_event_mm(struct mm_struct *mm,
					 enum memcg_memory_event event)
{}

void split_page_memcg(struct page *head, int old_order, int new_order);

#else /* CONFIG_MEMCG */

#define MEM_CGROUP_ID_SHIFT

static inline struct mem_cgroup *folio_memcg(struct folio *folio)
{
	return NULL;
}

static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio)
{
	WARN_ON_ONCE(!rcu_read_lock_held());
	return NULL;
}

static inline struct mem_cgroup *folio_memcg_check(struct folio *folio)
{
	return NULL;
}

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

static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg)
{
	return NULL;
}

static inline bool folio_memcg_kmem(struct folio *folio)
{
	return false;
}

static inline bool PageMemcgKmem(struct page *page)
{
	return false;
}

static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
{
	return true;
}

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

static inline void memcg_memory_event(struct mem_cgroup *memcg,
				      enum memcg_memory_event event)
{
}

static inline void memcg_memory_event_mm(struct mm_struct *mm,
					 enum memcg_memory_event event)
{
}

static inline void mem_cgroup_protection(struct mem_cgroup *root,
					 struct mem_cgroup *memcg,
					 unsigned long *min,
					 unsigned long *low)
{
	*min = *low = 0;
}

static inline void mem_cgroup_calculate_protection(struct mem_cgroup *root,
						   struct mem_cgroup *memcg)
{
}

static inline bool mem_cgroup_unprotected(struct mem_cgroup *target,
					  struct mem_cgroup *memcg)
{
	return true;
}
static inline bool mem_cgroup_below_low(struct mem_cgroup *target,
					struct mem_cgroup *memcg)
{
	return false;
}

static inline bool mem_cgroup_below_min(struct mem_cgroup *target,
					struct mem_cgroup *memcg)
{
	return false;
}

static inline void mem_cgroup_commit_charge(struct folio *folio,
		struct mem_cgroup *memcg)
{
}

static inline int mem_cgroup_charge(struct folio *folio,
		struct mm_struct *mm, gfp_t gfp)
{
	return 0;
}

static inline int mem_cgroup_hugetlb_try_charge(struct mem_cgroup *memcg,
		gfp_t gfp, long nr_pages)
{
	return 0;
}

static inline int mem_cgroup_swapin_charge_folio(struct folio *folio,
			struct mm_struct *mm, gfp_t gfp, swp_entry_t entry)
{
	return 0;
}

static inline void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry, unsigned int nr)
{
}

static inline void mem_cgroup_uncharge(struct folio *folio)
{
}

static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios)
{
}

static inline void mem_cgroup_cancel_charge(struct mem_cgroup *memcg,
		unsigned int nr_pages)
{
}

static inline void mem_cgroup_replace_folio(struct folio *old,
		struct folio *new)
{
}

static inline void mem_cgroup_migrate(struct folio *old, struct folio *new)
{
}

static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
					       struct pglist_data *pgdat)
{
	return &pgdat->__lruvec;
}

static inline struct lruvec *folio_lruvec(struct folio *folio)
{
	struct pglist_data *pgdat = folio_pgdat(folio);
	return &pgdat->__lruvec;
}

static inline
void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio)
{
}

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

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

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

static inline struct mem_cgroup *get_mem_cgroup_from_current(void)
{
	return NULL;
}

static inline struct mem_cgroup *get_mem_cgroup_from_folio(struct folio *folio)
{
	return NULL;
}

static inline
struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css)
{
	return NULL;
}

static inline void obj_cgroup_put(struct obj_cgroup *objcg)
{
}

static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg)
{
	return true;
}

static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
{
	return true;
}

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

static inline struct lruvec *folio_lruvec_lock(struct folio *folio)
{
	struct pglist_data *pgdat = folio_pgdat(folio);

	spin_lock(&pgdat->__lruvec.lru_lock);
	return &pgdat->__lruvec;
}

static inline struct lruvec *folio_lruvec_lock_irq(struct folio *folio)
{
	struct pglist_data *pgdat = folio_pgdat(folio);

	spin_lock_irq(&pgdat->__lruvec.lru_lock);
	return &pgdat->__lruvec;
}

static inline struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio,
		unsigned long *flagsp)
{
	struct pglist_data *pgdat = folio_pgdat(folio);

	spin_lock_irqsave(&pgdat->__lruvec.lru_lock, *flagsp);
	return &pgdat->__lruvec;
}

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 void mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
		int (*fn)(struct task_struct *, void *), void *arg)
{
}

static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
{
	return 0;
}

static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
{
	WARN_ON_ONCE(id);
	/* XXX: This should always return root_mem_cgroup */
	return NULL;
}

#ifdef CONFIG_SHRINKER_DEBUG
static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg)
{
	return 0;
}

static inline struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
{
	return NULL;
}
#endif

static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
{
	return NULL;
}

static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
{
	return NULL;
}

static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
{
	return true;
}

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

static inline unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg)
{
	return 0;
}

static inline unsigned long mem_cgroup_size(struct mem_cgroup *memcg)
{
	return 0;
}

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

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

static inline void mem_cgroup_handle_over_high(gfp_t gfp_mask)
{
}

static inline struct mem_cgroup *mem_cgroup_get_oom_group(
	struct task_struct *victim, struct mem_cgroup *oom_domain)
{
	return NULL;
}

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

static inline void __mod_memcg_state(struct mem_cgroup *memcg,
				     enum memcg_stat_item idx,
				     int nr)
{
}

static inline void mod_memcg_state(struct mem_cgroup *memcg,
				   enum memcg_stat_item idx,
				   int nr)
{
}

static inline void mod_memcg_page_state(struct page *page,
					enum memcg_stat_item idx, int val)
{
}

static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
{
	return 0;
}

static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
					      enum node_stat_item idx)
{
	return node_page_state(lruvec_pgdat(lruvec), idx);
}

static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec,
						    enum node_stat_item idx)
{
	return node_page_state(lruvec_pgdat(lruvec), idx);
}

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

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

static inline void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
					   int val)
{
	struct page *page = virt_to_head_page(p);

	__mod_node_page_state(page_pgdat(page), idx, val);
}

static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
					 int val)
{
	struct page *page = virt_to_head_page(p);

	mod_node_page_state(page_pgdat(page), idx, val);
}

static inline void count_memcg_events(struct mem_cgroup *memcg,
				      enum vm_event_item idx,
				      unsigned long count)
{
}

static inline void __count_memcg_events(struct mem_cgroup *memcg,
					enum vm_event_item idx,
					unsigned long count)
{
}

static inline void count_memcg_folio_events(struct folio *folio,
		enum vm_event_item idx, unsigned long nr)
{
}

static inline void count_memcg_events_mm(struct mm_struct *mm,
					enum vm_event_item idx, unsigned long count)
{
}

static inline
void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx)
{
}

static inline void split_page_memcg(struct page *head, int old_order, int new_order)
{
}
#endif /* CONFIG_MEMCG */

/*
 * Extended information for slab objects stored as an array in page->memcg_data
 * if MEMCG_DATA_OBJEXTS is set.
 */
struct slabobj_ext {} __aligned();

static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx)
{}

static inline void __dec_lruvec_kmem_state(void *p, enum node_stat_item idx)
{}

static inline struct lruvec *parent_lruvec(struct lruvec *lruvec)
{}

static inline void unlock_page_lruvec(struct lruvec *lruvec)
{}

static inline void unlock_page_lruvec_irq(struct lruvec *lruvec)
{}

static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec,
		unsigned long flags)
{}

/* Test requires a stable folio->memcg binding, see folio_memcg() */
static inline bool folio_matches_lruvec(struct folio *folio,
		struct lruvec *lruvec)
{}

/* Don't lock again iff page's lruvec locked */
static inline struct lruvec *folio_lruvec_relock_irq(struct folio *folio,
		struct lruvec *locked_lruvec)
{}

/* Don't lock again iff folio's lruvec locked */
static inline void folio_lruvec_relock_irqsave(struct folio *folio,
		struct lruvec **lruvecp, unsigned long *flags)
{}

#ifdef CONFIG_CGROUP_WRITEBACK

struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
			 unsigned long *pheadroom, unsigned long *pdirty,
			 unsigned long *pwriteback);

void mem_cgroup_track_foreign_dirty_slowpath(struct folio *folio,
					     struct bdi_writeback *wb);

static inline void mem_cgroup_track_foreign_dirty(struct folio *folio,
						  struct bdi_writeback *wb)
{}

void mem_cgroup_flush_foreign(struct bdi_writeback *wb);

#else	/* CONFIG_CGROUP_WRITEBACK */

static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb)
{
	return NULL;
}

static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb,
				       unsigned long *pfilepages,
				       unsigned long *pheadroom,
				       unsigned long *pdirty,
				       unsigned long *pwriteback)
{
}

static inline void mem_cgroup_track_foreign_dirty(struct folio *folio,
						  struct bdi_writeback *wb)
{
}

static inline void mem_cgroup_flush_foreign(struct bdi_writeback *wb)
{
}

#endif	/* CONFIG_CGROUP_WRITEBACK */

struct sock;
bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
			     gfp_t gfp_mask);
void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages);
#ifdef CONFIG_MEMCG
extern struct static_key_false memcg_sockets_enabled_key;
#define mem_cgroup_sockets_enabled
void mem_cgroup_sk_alloc(struct sock *sk);
void mem_cgroup_sk_free(struct sock *sk);
static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
{}

int alloc_shrinker_info(struct mem_cgroup *memcg);
void free_shrinker_info(struct mem_cgroup *memcg);
void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id);
void reparent_shrinker_deferred(struct mem_cgroup *memcg);
#else
#define mem_cgroup_sockets_enabled
static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
static inline void mem_cgroup_sk_free(struct sock *sk) { };
static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
{
	return false;
}

static inline void set_shrinker_bit(struct mem_cgroup *memcg,
				    int nid, int shrinker_id)
{
}
#endif

#ifdef CONFIG_MEMCG
bool mem_cgroup_kmem_disabled(void);
int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order);
void __memcg_kmem_uncharge_page(struct page *page, int order);

/*
 * The returned objcg pointer is safe to use without additional
 * protection within a scope. The scope is defined either by
 * the current task (similar to the "current" global variable)
 * or by set_active_memcg() pair.
 * Please, use obj_cgroup_get() to get a reference if the pointer
 * needs to be used outside of the local scope.
 */
struct obj_cgroup *current_obj_cgroup(void);
struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio);

static inline struct obj_cgroup *get_obj_cgroup_from_current(void)
{}

int obj_cgroup_charge(struct obj_cgroup *objcg, gfp_t gfp, size_t size);
void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size);

extern struct static_key_false memcg_bpf_enabled_key;
static inline bool memcg_bpf_enabled(void)
{}

extern struct static_key_false memcg_kmem_online_key;

static inline bool memcg_kmem_online(void)
{}

static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
					 int order)
{}

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

/*
 * A helper for accessing memcg's kmem_id, used for getting
 * corresponding LRU lists.
 */
static inline int memcg_kmem_id(struct mem_cgroup *memcg)
{}

struct mem_cgroup *mem_cgroup_from_slab_obj(void *p);

static inline void count_objcg_event(struct obj_cgroup *objcg,
				     enum vm_event_item idx)
{}

#else
static inline bool mem_cgroup_kmem_disabled(void)
{
	return true;
}

static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
					 int order)
{
	return 0;
}

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

static inline int __memcg_kmem_charge_page(struct page *page, gfp_t gfp,
					   int order)
{
	return 0;
}

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

static inline struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio)
{
	return NULL;
}

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

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

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

static inline struct mem_cgroup *mem_cgroup_from_slab_obj(void *p)
{
	return NULL;
}

static inline void count_objcg_event(struct obj_cgroup *objcg,
				     enum vm_event_item idx)
{
}

#endif /* CONFIG_MEMCG */

#if defined(CONFIG_MEMCG) && defined(CONFIG_ZSWAP)
bool obj_cgroup_may_zswap(struct obj_cgroup *objcg);
void obj_cgroup_charge_zswap(struct obj_cgroup *objcg, size_t size);
void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg, size_t size);
bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg);
#else
static inline bool obj_cgroup_may_zswap(struct obj_cgroup *objcg)
{
	return true;
}
static inline void obj_cgroup_charge_zswap(struct obj_cgroup *objcg,
					   size_t size)
{
}
static inline void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg,
					     size_t size)
{
}
static inline bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg)
{
	/* if zswap is disabled, do not block pages going to the swapping device */
	return true;
}
#endif


/* Cgroup v1-related declarations */

#ifdef CONFIG_MEMCG_V1
unsigned long memcg1_soft_limit_reclaim(pg_data_t *pgdat, int order,
					gfp_t gfp_mask,
					unsigned long *total_scanned);

bool mem_cgroup_oom_synchronize(bool wait);

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

void folio_memcg_lock(struct folio *folio);
void folio_memcg_unlock(struct folio *folio);

/* try to stablize folio_memcg() for all the pages in a memcg */
static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
{}

static inline void mem_cgroup_unlock_pages(void)
{}

static inline void mem_cgroup_enter_user_fault(void)
{}

static inline void mem_cgroup_exit_user_fault(void)
{}

#else /* CONFIG_MEMCG_V1 */
static inline
unsigned long memcg1_soft_limit_reclaim(pg_data_t *pgdat, int order,
					gfp_t gfp_mask,
					unsigned long *total_scanned)
{
	return 0;
}

static inline void folio_memcg_lock(struct folio *folio)
{
}

static inline void folio_memcg_unlock(struct folio *folio)
{
}

static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
{
	/* to match folio_memcg_rcu() */
	rcu_read_lock();
	return true;
}

static inline void mem_cgroup_unlock_pages(void)
{
	rcu_read_unlock();
}

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_enter_user_fault(void)
{
}

static inline void mem_cgroup_exit_user_fault(void)
{
}

#endif /* CONFIG_MEMCG_V1 */

#endif /* _LINUX_MEMCONTROL_H */