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/* 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/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 {
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
struct mem_cgroup_id {
int id;
refcount_t ref;
};
/*
* Per memcg event counter is incremented at every pagein/pageout. With THP,
* it will be incremented by the number of pages. This counter is used
* to trigger some periodic events. This is straightforward and better
* than using jiffies etc. to handle periodic memcg event.
*/
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;
/* scan generation, increased every round-trip */
unsigned int generation;
};
struct lruvec_stats_percpu {
/* Local (CPU and cgroup) state */
long state[NR_VM_NODE_STAT_ITEMS];
/* Delta calculation for lockless upward propagation */
long state_prev[NR_VM_NODE_STAT_ITEMS];
};
struct lruvec_stats {
/* Aggregated (CPU and subtree) state */
long state[NR_VM_NODE_STAT_ITEMS];
/* Non-hierarchical (CPU aggregated) state */
long state_local[NR_VM_NODE_STAT_ITEMS];
/* Pending child counts during tree propagation */
long state_pending[NR_VM_NODE_STAT_ITEMS];
};
/*
* per-node information in memory controller.
*/
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; /* RB tree node */
unsigned long usage_in_excess;/* Set to the value by which */
/* the soft limit is exceeded*/
bool on_tree;
struct mem_cgroup *memcg; /* Back pointer, we cannot */
/* use container_of */
};
struct mem_cgroup_threshold {
struct eventfd_ctx *eventfd;
unsigned long threshold;
};
/* For threshold */
struct mem_cgroup_threshold_ary {
/* An array index points to threshold just below or equal to usage. */
int current_threshold;
/* Size of entries[] */
unsigned int size;
/* Array of thresholds */
struct mem_cgroup_threshold entries[] __counted_by(size);
};
struct mem_cgroup_thresholds {
/* Primary thresholds array */
struct mem_cgroup_threshold_ary *primary;
/*
* Spare threshold array.
* This is needed to make mem_cgroup_unregister_event() "never fail".
* It must be able to store at least primary->size - 1 entries.
*/
struct mem_cgroup_threshold_ary *spare;
};
/*
* 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 4
struct memcg_cgwb_frn {
u64 bdi_id; /* bdi->id of the foreign inode */
int memcg_id; /* memcg->css.id of foreign inode */
u64 at; /* jiffies_64 at the time of dirtying */
struct wb_completion done; /* tracks in-flight foreign writebacks */
};
/*
* 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 {
struct percpu_ref refcnt;
struct mem_cgroup *memcg;
atomic_t nr_charged_bytes;
union {
struct list_head list; /* protected by objcg_lock */
struct rcu_head rcu;
};
};
/*
* 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 {
struct cgroup_subsys_state css;
/* Private memcg ID. Used to ID objects that outlive the cgroup */
struct mem_cgroup_id id;
/* Accounted resources */
struct page_counter memory; /* Both v1 & v2 */
union {
struct page_counter swap; /* v2 only */
struct page_counter memsw; /* v1 only */
};
/* Legacy consumer-oriented counters */
struct page_counter kmem; /* v1 only */
struct page_counter tcpmem; /* v1 only */
/* Range enforcement for interrupt charges */
struct work_struct high_work;
#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
unsigned long zswap_max;
/*
* Prevent pages from this memcg from being written back from zswap to
* swap, and from being swapped out on zswap store failures.
*/
bool zswap_writeback;
#endif
unsigned long soft_limit;
/* vmpressure notifications */
struct vmpressure vmpressure;
/*
* Should the OOM killer kill all belonging tasks, had it kill one?
*/
bool oom_group;
/* protected by memcg_oom_lock */
bool oom_lock;
int under_oom;
int swappiness;
/* OOM-Killer disable */
int oom_kill_disable;
/* memory.events and memory.events.local */
struct cgroup_file events_file;
struct cgroup_file events_local_file;
/* handle for "memory.swap.events" */
struct cgroup_file swap_events_file;
/* protect arrays of thresholds */
struct mutex thresholds_lock;
/* thresholds for memory usage. RCU-protected */
struct mem_cgroup_thresholds thresholds;
/* thresholds for mem+swap usage. RCU-protected */
struct mem_cgroup_thresholds memsw_thresholds;
/* For oom notifier event fd */
struct list_head oom_notify;
/*
* Should we move charges of a task when a task is moved into this
* mem_cgroup ? And what type of charges should we move ?
*/
unsigned long move_charge_at_immigrate;
/* taken only while moving_account > 0 */
spinlock_t move_lock;
unsigned long move_lock_flags;
CACHELINE_PADDING(_pad1_);
/* memory.stat */
struct memcg_vmstats *vmstats;
/* memory.events */
atomic_long_t memory_events[MEMCG_NR_MEMORY_EVENTS];
atomic_long_t memory_events_local[MEMCG_NR_MEMORY_EVENTS];
/*
* Hint of reclaim pressure for socket memroy management. Note
* that this indicator should NOT be used in legacy cgroup mode
* where socket memory is accounted/charged separately.
*/
unsigned long socket_pressure;
/* Legacy tcp memory accounting */
bool tcpmem_active;
int tcpmem_pressure;
#ifdef CONFIG_MEMCG_KMEM
int kmemcg_id;
/*
* memcg->objcg is wiped out as a part of the objcg repaprenting
* process. memcg->orig_objcg preserves a pointer (and a reference)
* to the original objcg until the end of live of memcg.
*/
struct obj_cgroup __rcu *objcg;
struct obj_cgroup *orig_objcg;
/* list of inherited objcgs, protected by objcg_lock */
struct list_head objcg_list;
#endif
CACHELINE_PADDING(_pad2_);
/*
* set > 0 if pages under this cgroup are moving to other cgroup.
*/
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
/* List of events which userspace want to receive */
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_WALKS_MMU
/* per-memcg mm_struct list */
struct lru_gen_mm_list mm_list;
#endif
struct mem_cgroup_per_node *nodeinfo[];
};
/*
* 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 64U
extern struct mem_cgroup *root_mem_cgroup;
enum page_memcg_data_flags {
/* page->memcg_data is a pointer to an objcgs vector */
MEMCG_DATA_OBJCGS = (1UL << 0),
/* page has been accounted as a non-slab kernel page */
MEMCG_DATA_KMEM = (1UL << 1),
/* the next bit after the last actual flag */
__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);
/*
* 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:
* e.g. acquire the rcu_read_lock or css_set_lock.
*/
static inline struct mem_cgroup *obj_cgroup_memcg(struct obj_cgroup *objcg)
{
return READ_ONCE(objcg->memcg);
}
/*
* __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)
{
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);
}
/*
* __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)
{
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);
}
/*
* 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)
{
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));
}
/**
* 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)
{
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);
}
/*
* 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)
{
/*
* Because folio->memcg_data might be changed asynchronously
* for slabs, READ_ONCE() should be used here.
*/
unsigned long memcg_data = READ_ONCE(folio->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 *page_memcg_check(struct page *page)
{
if (PageTail(page))
return NULL;
return folio_memcg_check((struct folio *)page);
}
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
/*
* 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)
{
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;
/*
* There is no reclaim protection applied to a targeted reclaim.
* We are special casing this specific case here because
* mem_cgroup_calculate_protection is not robust enough to keep
* the protection invariant for calculated effective values for
* parallel reclaimers with different reclaim target. This is
* especially a problem for tail memcgs (as they have pages on LRU)
* which would want to have effective values 0 for targeted reclaim
* but a different value for external reclaim.
*
* Example
* Let's have global and A's reclaim in parallel:
* |
* A (low=2G, usage = 3G, max = 3G, children_low_usage = 1.5G)
* |\
* | C (low = 1G, usage = 2.5G)
* B (low = 1G, usage = 0.5G)
*
* For the global reclaim
* A.elow = A.low
* B.elow = min(B.usage, B.low) because children_low_usage <= A.elow
* C.elow = min(C.usage, C.low)
*
* With the effective values resetting we have A reclaim
* A.elow = 0
* B.elow = B.low
* C.elow = C.low
*
* If the global reclaim races with A's reclaim then
* B.elow = C.elow = 0 because children_low_usage > A.elow)
* is possible and reclaiming B would be violating the protection.
*
*/
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_unprotected(struct mem_cgroup *target,
struct mem_cgroup *memcg)
{
/*
* The root memcg doesn't account charges, and doesn't support
* protection. The target memcg's protection is ignored, see
* mem_cgroup_calculate_protection() and mem_cgroup_protection()
*/
return mem_cgroup_disabled() || mem_cgroup_is_root(memcg) ||
memcg == target;
}
static inline bool mem_cgroup_below_low(struct mem_cgroup *target,
struct mem_cgroup *memcg)
{
if (mem_cgroup_unprotected(target, memcg))
return false;
return READ_ONCE(memcg->memory.elow) >=
page_counter_read(&memcg->memory);
}
static inline bool mem_cgroup_below_min(struct mem_cgroup *target,
struct mem_cgroup *memcg)
{
if (mem_cgroup_unprotected(target, memcg))
return false;
return READ_ONCE(memcg->memory.emin) >=
page_counter_read(&memcg->memory);
}
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)
{
if (mem_cgroup_disabled())
return 0;
return __mem_cgroup_charge(folio, mm, 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);
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)
{
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_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)
{
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:
/*
* Since a node can be onlined after the mem_cgroup was created,
* we have to be prepared to initialize lruvec->pgdat here;
* and if offlined then reonlined, we need to reinitialize it.
*/
if (unlikely(lruvec->pgdat != pgdat))
lruvec->pgdat = pgdat;
return lruvec;
}
/**
* 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 *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 mem_cgroup *get_mem_cgroup_from_current(void);
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 bool mem_cgroup_tryget(struct mem_cgroup *memcg)
{
return !memcg || css_tryget(&memcg->css);
}
static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
{
return !memcg || css_tryget_online(&memcg->css);
}
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 *);
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)
{
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;
}
/**
* 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)
{
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_folio(struct folio *folio);
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 __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val);
/* try to stablize folio_memcg() for all the pages in a memcg */
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();
}
/* idx can be of type enum memcg_stat_item or node_stat_item */
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;
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_local[idx]);
#ifdef CONFIG_SMP
if (x < 0)
x = 0;
#endif
return x;
}
void mem_cgroup_flush_stats(struct mem_cgroup *memcg);
void mem_cgroup_flush_stats_ratelimited(struct mem_cgroup *memcg);
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_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 /* CONFIG_MEMCG */
#define MEM_CGROUP_ID_SHIFT 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 *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)
{
}
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_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 *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 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 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(struct mem_cgroup *memcg)
{
}
static inline void mem_cgroup_flush_stats_ratelimited(struct mem_cgroup *memcg)
{
}
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_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 /* CONFIG_MEMCG */
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);
}
/* Test requires a stable page->memcg binding, see page_memcg() */
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);
}
/* Don't lock again iff page's lruvec locked */
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);
}
/* Don't lock again iff page's lruvec locked */
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 /* 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 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);
/*
* 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)
{
struct obj_cgroup *objcg = current_obj_cgroup();
if (objcg)
obj_cgroup_get(objcg);
return objcg;
}
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)
{
return static_branch_likely(&memcg_bpf_enabled_key);
}
extern struct static_key_false memcg_kmem_online_key;
static inline bool memcg_kmem_online(void)
{
return static_branch_likely(&memcg_kmem_online_key);
}
static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
int order)
{
if (memcg_kmem_online())
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_online())
__memcg_kmem_uncharge_page(page, 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)
{
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_online())
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_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_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 /* CONFIG_MEMCG_KMEM */
#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);
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
#endif /* _LINUX_MEMCONTROL_H */
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