/* SPDX-License-Identifier: GPL-2.0-or-later */


#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/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>

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


enum memcg_stat_item {
	MEMCG_SWAP = NR_VM_NODE_STAT_ITEMS,
	MEMCG_SOCK,
	MEMCG_PERCPU_B,
	MEMCG_VMALLOC,
	MEMCG_KMEM,
	MEMCG_ZSWAP_B,
	MEMCG_ZSWAPPED,
	MEMCG_NR_STAT,
};

enum memcg_memory_event {
	MEMCG_LOW,
	MEMCG_HIGH,
	MEMCG_MAX,
	MEMCG_OOM,
	MEMCG_OOM_KILL,
	MEMCG_OOM_GROUP_KILL,
	MEMCG_SWAP_HIGH,
	MEMCG_SWAP_MAX,
	MEMCG_SWAP_FAIL,
	MEMCG_NR_MEMORY_EVENTS,
};

struct mem_cgroup_reclaim_cookie {
	pg_data_t *pgdat;
	unsigned int generation;
};

#ifdef CONFIG_MEMCG

#define MEM_CGROUP_ID_SHIFT	16
#define MEM_CGROUP_ID_MAX	USHRT_MAX

struct mem_cgroup_id {
	int id;
	refcount_t ref;
};


enum mem_cgroup_events_target {
	MEM_CGROUP_TARGET_THRESH,
	MEM_CGROUP_TARGET_SOFTLIMIT,
	MEM_CGROUP_NTARGETS,
};

struct memcg_vmstats_percpu;
struct memcg_vmstats;

struct mem_cgroup_reclaim_iter {
	struct mem_cgroup *position;
	
	unsigned int generation;
};


struct shrinker_info {
	struct rcu_head rcu;
	atomic_long_t *nr_deferred;
	unsigned long *map;
};

struct lruvec_stats_percpu {
	
	long state[NR_VM_NODE_STAT_ITEMS];

	
	long state_prev[NR_VM_NODE_STAT_ITEMS];
};

struct lruvec_stats {
	
	long state[NR_VM_NODE_STAT_ITEMS];

	
	long state_pending[NR_VM_NODE_STAT_ITEMS];
};


struct mem_cgroup_per_node {
	struct lruvec		lruvec;

	struct lruvec_stats_percpu __percpu	*lruvec_stats_percpu;
	struct lruvec_stats			lruvec_stats;

	unsigned long		lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];

	struct mem_cgroup_reclaim_iter	iter;

	struct shrinker_info __rcu	*shrinker_info;

	struct rb_node		tree_node;	
	unsigned long		usage_in_excess;
						
	bool			on_tree;
	struct mem_cgroup	*memcg;		
						
};

struct mem_cgroup_threshold {
	struct eventfd_ctx *eventfd;
	unsigned long threshold;
};


struct mem_cgroup_threshold_ary {
	
	int current_threshold;
	
	unsigned int size;
	
	struct mem_cgroup_threshold entries[];
};

struct mem_cgroup_thresholds {
	
	struct mem_cgroup_threshold_ary *primary;
	
	struct mem_cgroup_threshold_ary *spare;
};


#define MEMCG_CGWB_FRN_CNT	4

struct memcg_cgwb_frn {
	u64 bdi_id;			
	int memcg_id;			
	u64 at;				
	struct wb_completion done;	
};


struct obj_cgroup {
	struct percpu_ref refcnt;
	struct mem_cgroup *memcg;
	atomic_t nr_charged_bytes;
	union {
		struct list_head list; 
		struct rcu_head rcu;
	};
};


struct mem_cgroup {
	struct cgroup_subsys_state css;

	
	struct mem_cgroup_id id;

	
	struct page_counter memory;		

	union {
		struct page_counter swap;	
		struct page_counter memsw;	
	};

	
	struct page_counter kmem;		
	struct page_counter tcpmem;		

	
	struct work_struct high_work;

#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
	unsigned long zswap_max;
#endif

	unsigned long soft_limit;

	
	struct vmpressure vmpressure;

	
	bool oom_group;

	
	bool		oom_lock;
	int		under_oom;

	int	swappiness;
	
	int		oom_kill_disable;

	
	struct cgroup_file events_file;
	struct cgroup_file events_local_file;

	
	struct cgroup_file swap_events_file;

	
	struct mutex thresholds_lock;

	
	struct mem_cgroup_thresholds thresholds;

	
	struct mem_cgroup_thresholds memsw_thresholds;

	
	struct list_head oom_notify;

	
	unsigned long move_charge_at_immigrate;
	
	spinlock_t		move_lock;
	unsigned long		move_lock_flags;

	CACHELINE_PADDING(_pad1_);

	
	struct memcg_vmstats	*vmstats;

	
	atomic_long_t		memory_events[MEMCG_NR_MEMORY_EVENTS];
	atomic_long_t		memory_events_local[MEMCG_NR_MEMORY_EVENTS];

	
	unsigned long		socket_pressure;

	
	bool			tcpmem_active;
	int			tcpmem_pressure;

#ifdef CONFIG_MEMCG_KMEM
	int kmemcg_id;
	struct obj_cgroup __rcu *objcg;
	
	struct list_head objcg_list;
#endif

	CACHELINE_PADDING(_pad2_);

	
	atomic_t		moving_account;
	struct task_struct	*move_lock_task;

	struct memcg_vmstats_percpu __percpu *vmstats_percpu;

#ifdef CONFIG_CGROUP_WRITEBACK
	struct list_head cgwb_list;
	struct wb_domain cgwb_domain;
	struct memcg_cgwb_frn cgwb_frn[MEMCG_CGWB_FRN_CNT];
#endif

	
	struct list_head event_list;
	spinlock_t event_list_lock;

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	struct deferred_split deferred_split_queue;
#endif

#ifdef CONFIG_LRU_GEN
	
	struct lru_gen_mm_list mm_list;
#endif

	struct mem_cgroup_per_node *nodeinfo[];
};


#define MEMCG_CHARGE_BATCH 64U

extern struct mem_cgroup *root_mem_cgroup;

enum page_memcg_data_flags {
	
	MEMCG_DATA_OBJCGS = (1UL << 0),
	
	MEMCG_DATA_KMEM = (1UL << 1),
	
	__NR_MEMCG_DATA_FLAGS  = (1UL << 2),
};

#define MEMCG_DATA_FLAGS_MASK (__NR_MEMCG_DATA_FLAGS - 1)

static inline bool folio_memcg_kmem(struct folio *folio);


static inline struct mem_cgroup *obj_cgroup_memcg(struct obj_cgroup *objcg)
{
	return READ_ONCE(objcg->memcg);
}


static inline struct mem_cgroup *__folio_memcg(struct folio *folio)
{
	unsigned long memcg_data = folio->memcg_data;

	VM_BUG_ON_FOLIO(folio_test_slab(folio), folio);
	VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJCGS, folio);
	VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_KMEM, folio);

	return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
}


static inline struct obj_cgroup *__folio_objcg(struct folio *folio)
{
	unsigned long memcg_data = folio->memcg_data;

	VM_BUG_ON_FOLIO(folio_test_slab(folio), folio);
	VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJCGS, folio);
	VM_BUG_ON_FOLIO(!(memcg_data & MEMCG_DATA_KMEM), folio);

	return (struct obj_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
}


static inline struct mem_cgroup *folio_memcg(struct folio *folio)
{
	if (folio_memcg_kmem(folio))
		return obj_cgroup_memcg(__folio_objcg(folio));
	return __folio_memcg(folio);
}

static inline struct mem_cgroup *page_memcg(struct page *page)
{
	return folio_memcg(page_folio(page));
}


static inline struct mem_cgroup *folio_memcg_rcu(struct folio *folio)
{
	unsigned long memcg_data = READ_ONCE(folio->memcg_data);

	VM_BUG_ON_FOLIO(folio_test_slab(folio), folio);
	WARN_ON_ONCE(!rcu_read_lock_held());

	if (memcg_data & MEMCG_DATA_KMEM) {
		struct obj_cgroup *objcg;

		objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
		return obj_cgroup_memcg(objcg);
	}

	return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
}


static inline struct mem_cgroup *page_memcg_check(struct page *page)
{
	
	unsigned long memcg_data = READ_ONCE(page->memcg_data);

	if (memcg_data & MEMCG_DATA_OBJCGS)
		return NULL;

	if (memcg_data & MEMCG_DATA_KMEM) {
		struct obj_cgroup *objcg;

		objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
		return obj_cgroup_memcg(objcg);
	}

	return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
}

static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg)
{
	struct mem_cgroup *memcg;

	rcu_read_lock();
retry:
	memcg = obj_cgroup_memcg(objcg);
	if (unlikely(!css_tryget(&memcg->css)))
		goto retry;
	rcu_read_unlock();

	return memcg;
}

#ifdef CONFIG_MEMCG_KMEM

static inline bool folio_memcg_kmem(struct folio *folio)
{
	VM_BUG_ON_PGFLAGS(PageTail(&folio->page), &folio->page);
	VM_BUG_ON_FOLIO(folio->memcg_data & MEMCG_DATA_OBJCGS, folio);
	return folio->memcg_data & MEMCG_DATA_KMEM;
}


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

#endif

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

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

static inline bool mem_cgroup_disabled(void)
{
	return !cgroup_subsys_enabled(memory_cgrp_subsys);
}

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

	if (mem_cgroup_disabled())
		return;

	
	if (root == memcg)
		return;

	*min = READ_ONCE(memcg->memory.emin);
	*low = READ_ONCE(memcg->memory.elow);
}

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

static inline bool mem_cgroup_supports_protection(struct mem_cgroup *memcg)
{
	
	return !mem_cgroup_disabled() && !mem_cgroup_is_root(memcg);

}

static inline bool mem_cgroup_below_low(struct mem_cgroup *memcg)
{
	if (!mem_cgroup_supports_protection(memcg))
		return false;

	return READ_ONCE(memcg->memory.elow) >=
		page_counter_read(&memcg->memory);
}

static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
{
	if (!mem_cgroup_supports_protection(memcg))
		return false;

	return READ_ONCE(memcg->memory.emin) >=
		page_counter_read(&memcg->memory);
}

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


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

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);

void __mem_cgroup_uncharge(struct folio *folio);


static inline void mem_cgroup_uncharge(struct folio *folio)
{
	if (mem_cgroup_disabled())
		return;
	__mem_cgroup_uncharge(folio);
}

void __mem_cgroup_uncharge_list(struct list_head *page_list);
static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
{
	if (mem_cgroup_disabled())
		return;
	__mem_cgroup_uncharge_list(page_list);
}

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)
{
	struct mem_cgroup_per_node *mz;
	struct lruvec *lruvec;

	if (mem_cgroup_disabled()) {
		lruvec = &pgdat->__lruvec;
		goto out;
	}

	if (!memcg)
		memcg = root_mem_cgroup;

	mz = memcg->nodeinfo[pgdat->node_id];
	lruvec = &mz->lruvec;
out:
	
	if (unlikely(lruvec->pgdat != pgdat))
		lruvec->pgdat = pgdat;
	return lruvec;
}


static inline struct lruvec *folio_lruvec(struct folio *folio)
{
	struct mem_cgroup *memcg = folio_memcg(folio);

	VM_WARN_ON_ONCE_FOLIO(!memcg && !mem_cgroup_disabled(), folio);
	return mem_cgroup_lruvec(memcg, folio_pgdat(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 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){
	return css ? container_of(css, struct mem_cgroup, css) : NULL;
}

static inline bool obj_cgroup_tryget(struct obj_cgroup *objcg)
{
	return percpu_ref_tryget(&objcg->refcnt);
}

static inline void obj_cgroup_get(struct obj_cgroup *objcg)
{
	percpu_ref_get(&objcg->refcnt);
}

static inline void obj_cgroup_get_many(struct obj_cgroup *objcg,
				       unsigned long nr)
{
	percpu_ref_get_many(&objcg->refcnt, nr);
}

static inline void obj_cgroup_put(struct obj_cgroup *objcg)
{
	percpu_ref_put(&objcg->refcnt);
}

static inline void mem_cgroup_put(struct mem_cgroup *memcg)
{
	if (memcg)
		css_put(&memcg->css);
}

#define mem_cgroup_from_counter(counter, member)	\
	container_of(counter, struct mem_cgroup, 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 *);
int mem_cgroup_scan_tasks(struct mem_cgroup *,
			  int (*)(struct task_struct *, void *), void *);

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

	return memcg->id.id;
}
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)
{
	return memcg ? cgroup_ino(memcg->css.cgroup) : 0;
}

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)
{
	return mem_cgroup_from_css(seq_css(m));
}

static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
{
	struct mem_cgroup_per_node *mz;

	if (mem_cgroup_disabled())
		return NULL;

	mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
	return mz->memcg;
}


static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
{
	return mem_cgroup_from_css(memcg->css.parent);
}

static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
			      struct mem_cgroup *root)
{
	if (root == memcg)
		return true;
	return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
}

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

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

struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page);
ino_t page_cgroup_ino(struct page *page);

static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
{
	if (mem_cgroup_disabled())
		return true;
	return !!(memcg->css.flags & CSS_ONLINE);
}

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)
{
	struct mem_cgroup_per_node *mz;

	mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
	return READ_ONCE(mz->lru_zone_size[zone_idx][lru]);
}

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);

static inline void mem_cgroup_enter_user_fault(void)
{
	WARN_ON(current->in_user_fault);
	current->in_user_fault = 1;
}

static inline void mem_cgroup_exit_user_fault(void)
{
	WARN_ON(!current->in_user_fault);
	current->in_user_fault = 0;
}

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

bool mem_cgroup_oom_synchronize(bool wait);
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 folio_memcg_lock(struct folio *folio);
void folio_memcg_unlock(struct folio *folio);
void lock_page_memcg(struct page *page);
void unlock_page_memcg(struct page *page);

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


static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
{
	rcu_read_lock();

	if (mem_cgroup_disabled() || !atomic_read(&memcg->moving_account))
		return true;

	rcu_read_unlock();
	return false;
}

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


static inline void mod_memcg_state(struct mem_cgroup *memcg,
				   int idx, int val)
{
	unsigned long flags;

	local_irq_save(flags);
	__mod_memcg_state(memcg, idx, val);
	local_irq_restore(flags);
}

static inline void mod_memcg_page_state(struct page *page,
					int idx, int val)
{
	struct mem_cgroup *memcg;

	if (mem_cgroup_disabled())
		return;

	rcu_read_lock();
	memcg = page_memcg(page);
	if (memcg)
		mod_memcg_state(memcg, idx, val);
	rcu_read_unlock();
}

unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx);

static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
					      enum node_stat_item idx)
{
	struct mem_cgroup_per_node *pn;
	long x;

	if (mem_cgroup_disabled())
		return node_page_state(lruvec_pgdat(lruvec), idx);

	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
	x = READ_ONCE(pn->lruvec_stats.state[idx]);
#ifdef CONFIG_SMP
	if (x < 0)
		x = 0;
#endif
	return x;
}

static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec,
						    enum node_stat_item idx)
{
	struct mem_cgroup_per_node *pn;
	long x = 0;
	int cpu;

	if (mem_cgroup_disabled())
		return node_page_state(lruvec_pgdat(lruvec), idx);

	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
	for_each_possible_cpu(cpu)
		x += per_cpu(pn->lruvec_stats_percpu->state[idx], cpu);
#ifdef CONFIG_SMP
	if (x < 0)
		x = 0;
#endif
	return x;
}

void mem_cgroup_flush_stats(void);
void mem_cgroup_flush_stats_delayed(void);

void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
			      int val);
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)
{
	unsigned long flags;

	local_irq_save(flags);
	__mod_lruvec_kmem_state(p, idx, val);
	local_irq_restore(flags);
}

static inline void mod_memcg_lruvec_state(struct lruvec *lruvec,
					  enum node_stat_item idx, int val)
{
	unsigned long flags;

	local_irq_save(flags);
	__mod_memcg_lruvec_state(lruvec, idx, val);
	local_irq_restore(flags);
}

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)
{
	unsigned long flags;

	local_irq_save(flags);
	__count_memcg_events(memcg, idx, count);
	local_irq_restore(flags);
}

static inline void count_memcg_page_event(struct page *page,
					  enum vm_event_item idx)
{
	struct mem_cgroup *memcg = page_memcg(page);

	if (memcg)
		count_memcg_events(memcg, idx, 1);
}

static inline void count_memcg_folio_events(struct folio *folio,
		enum vm_event_item idx, unsigned long nr)
{
	struct mem_cgroup *memcg = folio_memcg(folio);

	if (memcg)
		count_memcg_events(memcg, idx, nr);
}

static inline void count_memcg_event_mm(struct mm_struct *mm,
					enum vm_event_item idx)
{
	struct mem_cgroup *memcg;

	if (mem_cgroup_disabled())
		return;

	rcu_read_lock();
	memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
	if (likely(memcg))
		count_memcg_events(memcg, idx, 1);
	rcu_read_unlock();
}

static inline void memcg_memory_event(struct mem_cgroup *memcg,
				      enum memcg_memory_event event)
{
	bool swap_event = event == MEMCG_SWAP_HIGH || event == MEMCG_SWAP_MAX ||
			  event == MEMCG_SWAP_FAIL;

	atomic_long_inc(&memcg->memory_events_local[event]);
	if (!swap_event)
		cgroup_file_notify(&memcg->events_local_file);

	do {
		atomic_long_inc(&memcg->memory_events[event]);
		if (swap_event)
			cgroup_file_notify(&memcg->swap_events_file);
		else
			cgroup_file_notify(&memcg->events_file);

		if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
			break;
		if (cgrp_dfl_root.flags & CGRP_ROOT_MEMORY_LOCAL_EVENTS)
			break;
	} while ((memcg = parent_mem_cgroup(memcg)) &&
		 !mem_cgroup_is_root(memcg));
}

static inline void memcg_memory_event_mm(struct mm_struct *mm,
					 enum memcg_memory_event event)
{
	struct mem_cgroup *memcg;

	if (mem_cgroup_disabled())
		return;

	rcu_read_lock();
	memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
	if (likely(memcg))
		memcg_memory_event(memcg, event);
	rcu_read_unlock();
}

void split_page_memcg(struct page *head, unsigned int nr);

unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
						gfp_t gfp_mask,
						unsigned long *total_scanned);

#else 

#define MEM_CGROUP_ID_SHIFT	0
#define MEM_CGROUP_ID_MAX	0

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

static inline struct mem_cgroup *page_memcg(struct page *page)
{
	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 *page_memcg_check(struct page *page)
{
	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_below_low(struct mem_cgroup *memcg)
{
	return false;
}

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

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

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

static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
{
}

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

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

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 int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
		int (*fn)(struct task_struct *, void *), void *arg)
{
	return 0;
}

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);
	
	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 lock_page_memcg(struct page *page)
{
}

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

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)
{
	
	rcu_read_lock();
	return true;
}

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

static inline void mem_cgroup_handle_over_high(gfp_t gfp_mask)
{
}

static inline void mem_cgroup_enter_user_fault(void)
{
}

static inline void mem_cgroup_exit_user_fault(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 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,
				     int idx,
				     int nr)
{
}

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

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

static inline void mem_cgroup_flush_stats_delayed(void)
{
}

static inline void __mod_memcg_lruvec_state(struct lruvec *lruvec,
					    enum node_stat_item idx, int 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 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_page_event(struct page *page,
					  int idx)
{
}

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

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, unsigned int nr)
{
}

static inline
unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
					    gfp_t gfp_mask,
					    unsigned long *total_scanned)
{
	return 0;
}
#endif 

static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx)
{
	__mod_lruvec_kmem_state(p, idx, 1);
}

static inline void __dec_lruvec_kmem_state(void *p, enum node_stat_item idx)
{
	__mod_lruvec_kmem_state(p, idx, -1);
}

static inline struct lruvec *parent_lruvec(struct lruvec *lruvec)
{
	struct mem_cgroup *memcg;

	memcg = lruvec_memcg(lruvec);
	if (!memcg)
		return NULL;
	memcg = parent_mem_cgroup(memcg);
	if (!memcg)
		return NULL;
	return mem_cgroup_lruvec(memcg, lruvec_pgdat(lruvec));
}

static inline void unlock_page_lruvec(struct lruvec *lruvec)
{
	spin_unlock(&lruvec->lru_lock);
}

static inline void unlock_page_lruvec_irq(struct lruvec *lruvec)
{
	spin_unlock_irq(&lruvec->lru_lock);
}

static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec,
		unsigned long flags)
{
	spin_unlock_irqrestore(&lruvec->lru_lock, flags);
}


static inline bool folio_matches_lruvec(struct folio *folio,
		struct lruvec *lruvec)
{
	return lruvec_pgdat(lruvec) == folio_pgdat(folio) &&
	       lruvec_memcg(lruvec) == folio_memcg(folio);
}


static inline struct lruvec *folio_lruvec_relock_irq(struct folio *folio,
		struct lruvec *locked_lruvec)
{
	if (locked_lruvec) {
		if (folio_matches_lruvec(folio, locked_lruvec))
			return locked_lruvec;

		unlock_page_lruvec_irq(locked_lruvec);
	}

	return folio_lruvec_lock_irq(folio);
}


static inline struct lruvec *folio_lruvec_relock_irqsave(struct folio *folio,
		struct lruvec *locked_lruvec, unsigned long *flags)
{
	if (locked_lruvec) {
		if (folio_matches_lruvec(folio, locked_lruvec))
			return locked_lruvec;

		unlock_page_lruvec_irqrestore(locked_lruvec, *flags);
	}

	return folio_lruvec_lock_irqsave(folio, 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)
{
	struct mem_cgroup *memcg;

	if (mem_cgroup_disabled())
		return;

	memcg = folio_memcg(folio);
	if (unlikely(memcg && &memcg->css != wb->memcg_css))
		mem_cgroup_track_foreign_dirty_slowpath(folio, wb);
}

void mem_cgroup_flush_foreign(struct bdi_writeback *wb);

#else	

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	

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 static_branch_unlikely(&memcg_sockets_enabled_key)
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)
{
	if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
		return !!memcg->tcpmem_pressure;
	do {
		if (time_before(jiffies, READ_ONCE(memcg->socket_pressure)))
			return true;
	} while ((memcg = parent_mem_cgroup(memcg)));
	return false;
}

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 0
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_KMEM
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);

struct obj_cgroup *get_obj_cgroup_from_current(void);
struct obj_cgroup *get_obj_cgroup_from_page(struct page *page);

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_kmem_enabled_key;

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

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

static inline void memcg_kmem_uncharge_page(struct page *page, int order)
{
	if (memcg_kmem_enabled())
		__memcg_kmem_uncharge_page(page, order);
}


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

struct mem_cgroup *mem_cgroup_from_obj(void *p);
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)
{
	struct mem_cgroup *memcg;

	if (!memcg_kmem_enabled())
		return;

	rcu_read_lock();
	memcg = obj_cgroup_memcg(objcg);
	count_memcg_events(memcg, idx, 1);
	rcu_read_unlock();
}

#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_page(struct page *page)
{
	return NULL;
}

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

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

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

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 

#if defined(CONFIG_MEMCG_KMEM) && 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);
#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)
{
}
#endif

#endif 
