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Diffstat (limited to 'include/linux/memcontrol.h')
| -rw-r--r-- | include/linux/memcontrol.h | 1875 |
1 files changed, 1875 insertions, 0 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h new file mode 100644 index 000000000..50a078a31 --- /dev/null +++ b/include/linux/memcontrol.h @@ -0,0 +1,1875 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* memcontrol.h - Memory Controller + * + * Copyright IBM Corporation, 2007 + * Author Balbir Singh <balbir@linux.vnet.ibm.com> + * + * Copyright 2007 OpenVZ SWsoft Inc + * Author: Pavel Emelianov <xemul@openvz.org> + */ + +#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; + +/* 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 +#define MEM_CGROUP_ID_MAX USHRT_MAX + +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; +}; + +/* + * Bitmap and deferred work of shrinker::id corresponding to memcg-aware + * shrinkers, which have elements charged to this memcg. + */ +struct shrinker_info { + struct rcu_head rcu; + atomic_long_t *nr_deferred; + unsigned long *map; +}; + +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]; + + /* 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[]; +}; + +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; +#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; + struct obj_cgroup __rcu *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 + /* 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 + * - lock_page_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(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); +} + +/* + * page_memcg_check - get the memory cgroup associated with a page + * @page: a pointer to the page struct + * + * Returns a pointer to the memory cgroup associated with the page, + * or NULL. This function unlike page_memcg() can take any page + * as an argument. It has to be used in cases when it's not known if a page + * has an associated memory cgroup pointer or an object cgroups vector or + * an object cgroup. + * + * For a non-kmem page any of the following ensures page and memcg binding + * stability: + * + * - the page lock + * - LRU isolation + * - lock_page_memcg() + * - exclusive reference + * - mem_cgroup_trylock_pages() + * + * For a kmem page a caller should hold an rcu read lock to protect memcg + * associated with a kmem page from being released. + */ +static inline struct mem_cgroup *page_memcg_check(struct page *page) +{ + /* + * Because page->memcg_data might be changed asynchronously + * for slab pages, READ_ONCE() should be used here. + */ + 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 +/* + * 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_protected calculation 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_supports_protection(struct mem_cgroup *memcg) +{ + /* + * The root memcg doesn't account charges, and doesn't support + * protection. + */ + 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); + +/** + * 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_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_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 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; +} + +/** + * 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 or the memory + * controller is in legacy no-hierarchy mode. + */ +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); + +/* 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; + 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 /* CONFIG_MEMCG */ + +#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); + /* 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 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) +{ + /* 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(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 /* 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); + +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); +} + +/* + * 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_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 /* 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); +#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 /* _LINUX_MEMCONTROL_H */ |