/* 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> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #ifndef _LINUX_MEMCONTROL_H #define _LINUX_MEMCONTROL_H #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/mmzone.h> #include <linux/writeback.h> struct mem_cgroup; struct page; struct mm_struct; struct kmem_cache; /* * The corresponding mem_cgroup_stat_names is defined in mm/memcontrol.c, * These two lists should keep in accord with each other. */ enum mem_cgroup_stat_index { /* * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. */ MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */ MEM_CGROUP_STAT_RSS_HUGE, /* # of pages charged as anon huge */ MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */ MEM_CGROUP_STAT_DIRTY, /* # of dirty pages in page cache */ MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */ MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */ MEM_CGROUP_STAT_NSTATS, }; struct mem_cgroup_reclaim_cookie { struct zone *zone; int priority; unsigned int generation; }; enum mem_cgroup_events_index { MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */ MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */ MEM_CGROUP_EVENTS_PGFAULT, /* # of page-faults */ MEM_CGROUP_EVENTS_PGMAJFAULT, /* # of major page-faults */ MEM_CGROUP_EVENTS_NSTATS, /* default hierarchy events */ MEMCG_LOW = MEM_CGROUP_EVENTS_NSTATS, MEMCG_HIGH, MEMCG_MAX, MEMCG_OOM, MEMCG_NR_EVENTS, }; /* * Per memcg event counter is incremented at every pagein/pageout. With THP, * it will be incremated by the number of pages. This counter is used for * for 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_TARGET_NUMAINFO, MEM_CGROUP_NTARGETS, }; /* * Bits in struct cg_proto.flags */ enum cg_proto_flags { /* Currently active and new sockets should be assigned to cgroups */ MEMCG_SOCK_ACTIVE, /* It was ever activated; we must disarm static keys on destruction */ MEMCG_SOCK_ACTIVATED, }; struct cg_proto { struct page_counter memory_allocated; /* Current allocated memory. */ struct percpu_counter sockets_allocated; /* Current number of sockets. */ int memory_pressure; long sysctl_mem[3]; unsigned long flags; /* * memcg field is used to find which memcg we belong directly * Each memcg struct can hold more than one cg_proto, so container_of * won't really cut. * * The elegant solution would be having an inverse function to * proto_cgroup in struct proto, but that means polluting the structure * for everybody, instead of just for memcg users. */ struct mem_cgroup *memcg; }; #ifdef CONFIG_MEMCG struct mem_cgroup_stat_cpu { long count[MEM_CGROUP_STAT_NSTATS]; unsigned long events[MEMCG_NR_EVENTS]; unsigned long nr_page_events; unsigned long targets[MEM_CGROUP_NTARGETS]; }; struct mem_cgroup_reclaim_iter { struct mem_cgroup *position; /* scan generation, increased every round-trip */ unsigned int generation; }; /* * per-zone information in memory controller. */ struct mem_cgroup_per_zone { struct lruvec lruvec; unsigned long lru_size[NR_LRU_LISTS]; struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1]; 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_per_node { struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; }; 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[0]; }; 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; }; /* * 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; /* Accounted resources */ struct page_counter memory; struct page_counter memsw; struct page_counter kmem; /* Normal memory consumption range */ unsigned long low; unsigned long high; unsigned long soft_limit; /* vmpressure notifications */ struct vmpressure vmpressure; /* css_online() has been completed */ int initialized; /* * Should the accounting and control be hierarchical, per subtree? */ bool use_hierarchy; /* protected by memcg_oom_lock */ bool oom_lock; int under_oom; int swappiness; /* OOM-Killer disable */ int oom_kill_disable; /* handle for "memory.events" */ struct cgroup_file 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; /* * set > 0 if pages under this cgroup are moving to other cgroup. */ atomic_t moving_account; /* taken only while moving_account > 0 */ spinlock_t move_lock; struct task_struct *move_lock_task; unsigned long move_lock_flags; /* * percpu counter. */ struct mem_cgroup_stat_cpu __percpu *stat; #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_INET) struct cg_proto tcp_mem; #endif #if defined(CONFIG_MEMCG_KMEM) /* Index in the kmem_cache->memcg_params.memcg_caches array */ int kmemcg_id; bool kmem_acct_activated; bool kmem_acct_active; #endif int last_scanned_node; #if MAX_NUMNODES > 1 nodemask_t scan_nodes; atomic_t numainfo_events; atomic_t numainfo_updating; #endif #ifdef CONFIG_CGROUP_WRITEBACK struct list_head cgwb_list; struct wb_domain cgwb_domain; #endif /* List of events which userspace want to receive */ struct list_head event_list; spinlock_t event_list_lock; struct mem_cgroup_per_node *nodeinfo[0]; /* WARNING: nodeinfo must be the last member here */ }; extern struct cgroup_subsys_state *mem_cgroup_root_css; /** * mem_cgroup_events - count memory events against a cgroup * @memcg: the memory cgroup * @idx: the event index * @nr: the number of events to account for */ static inline void mem_cgroup_events(struct mem_cgroup *memcg, enum mem_cgroup_events_index idx, unsigned int nr) { this_cpu_add(memcg->stat->events[idx], nr); cgroup_file_notify(&memcg->events_file); } bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg); int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask, struct mem_cgroup **memcgp); void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, bool lrucare); void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg); void mem_cgroup_uncharge(struct page *page); void mem_cgroup_uncharge_list(struct list_head *page_list); void mem_cgroup_replace_page(struct page *oldpage, struct page *newpage); struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg); struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg); static inline struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){ return css ? container_of(css, struct mem_cgroup, css) : NULL; } 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 *); static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, struct mem_cgroup *root) { if (root == memcg) return true; if (!root->use_hierarchy) return false; 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_disabled(void) { return !cgroup_subsys_enabled(memory_cgrp_subsys); } /* * For memory reclaim. */ int mem_cgroup_select_victim_node(struct mem_cgroup *memcg); void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, int nr_pages); static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec) { struct mem_cgroup_per_zone *mz; struct mem_cgroup *memcg; if (mem_cgroup_disabled()) return true; mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec); memcg = mz->memcg; return !!(memcg->css.flags & CSS_ONLINE); } static inline unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) { struct mem_cgroup_per_zone *mz; mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec); return mz->lru_size[lru]; } static inline bool mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) { unsigned long inactive_ratio; unsigned long inactive; unsigned long active; unsigned long gb; inactive = mem_cgroup_get_lru_size(lruvec, LRU_INACTIVE_ANON); active = mem_cgroup_get_lru_size(lruvec, LRU_ACTIVE_ANON); gb = (inactive + active) >> (30 - PAGE_SHIFT); if (gb) inactive_ratio = int_sqrt(10 * gb); else inactive_ratio = 1; return inactive * inactive_ratio < active; } void mem_cgroup_handle_over_high(void); void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p); static inline void mem_cgroup_oom_enable(void) { WARN_ON(current->memcg_may_oom); current->memcg_may_oom = 1; } static inline void mem_cgroup_oom_disable(void) { WARN_ON(!current->memcg_may_oom); current->memcg_may_oom = 0; } static inline bool task_in_memcg_oom(struct task_struct *p) { return p->memcg_in_oom; } bool mem_cgroup_oom_synchronize(bool wait); #ifdef CONFIG_MEMCG_SWAP extern int do_swap_account; #endif struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page); void mem_cgroup_end_page_stat(struct mem_cgroup *memcg); /** * mem_cgroup_update_page_stat - update page state statistics * @memcg: memcg to account against * @idx: page state item to account * @val: number of pages (positive or negative) * * See mem_cgroup_begin_page_stat() for locking requirements. */ static inline void mem_cgroup_update_page_stat(struct mem_cgroup *memcg, enum mem_cgroup_stat_index idx, int val) { VM_BUG_ON(!rcu_read_lock_held()); if (memcg) this_cpu_add(memcg->stat->count[idx], val); } static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg, enum mem_cgroup_stat_index idx) { mem_cgroup_update_page_stat(memcg, idx, 1); } static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg, enum mem_cgroup_stat_index idx) { mem_cgroup_update_page_stat(memcg, idx, -1); } unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, gfp_t gfp_mask, unsigned long *total_scanned); static inline void mem_cgroup_count_vm_event(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 (unlikely(!memcg)) goto out; switch (idx) { case PGFAULT: this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]); break; case PGMAJFAULT: this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]); break; default: BUG(); } out: rcu_read_unlock(); } #ifdef CONFIG_TRANSPARENT_HUGEPAGE void mem_cgroup_split_huge_fixup(struct page *head); #endif #else /* CONFIG_MEMCG */ struct mem_cgroup; static inline void mem_cgroup_events(struct mem_cgroup *memcg, enum mem_cgroup_events_index idx, unsigned int nr) { } static inline bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg) { return false; } static inline int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask, struct mem_cgroup **memcgp) { *memcgp = NULL; return 0; } static inline void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, bool lrucare) { } static inline void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg) { } static inline void mem_cgroup_uncharge(struct page *page) { } static inline void mem_cgroup_uncharge_list(struct list_head *page_list) { } static inline void mem_cgroup_replace_page(struct page *old, struct page *new) { } static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone, struct mem_cgroup *memcg) { return &zone->lruvec; } static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct zone *zone) { return &zone->lruvec; } static inline bool mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *memcg) { return true; } static inline bool task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg) { return true; } 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 bool mem_cgroup_disabled(void) { return true; } static inline bool mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) { return true; } static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec) { return true; } static inline unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) { return 0; } static inline void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, int increment) { } static inline void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) { } static inline struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page) { return NULL; } static inline void mem_cgroup_end_page_stat(struct mem_cgroup *memcg) { } static inline void mem_cgroup_handle_over_high(void) { } static inline void mem_cgroup_oom_enable(void) { } static inline void mem_cgroup_oom_disable(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 void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg, enum mem_cgroup_stat_index idx) { } static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg, enum mem_cgroup_stat_index idx) { } static inline unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, gfp_t gfp_mask, unsigned long *total_scanned) { return 0; } static inline void mem_cgroup_split_huge_fixup(struct page *head) { } static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) { } #endif /* CONFIG_MEMCG */ enum { UNDER_LIMIT, SOFT_LIMIT, OVER_LIMIT, }; #ifdef CONFIG_CGROUP_WRITEBACK struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg); 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); #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) { } #endif /* CONFIG_CGROUP_WRITEBACK */ struct sock; #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM) void sock_update_memcg(struct sock *sk); void sock_release_memcg(struct sock *sk); #else static inline void sock_update_memcg(struct sock *sk) { } static inline void sock_release_memcg(struct sock *sk) { } #endif /* CONFIG_INET && CONFIG_MEMCG_KMEM */ #ifdef CONFIG_MEMCG_KMEM extern struct static_key memcg_kmem_enabled_key; extern int memcg_nr_cache_ids; void memcg_get_cache_ids(void); void memcg_put_cache_ids(void); /* * Helper macro to loop through all memcg-specific caches. Callers must still * check if the cache is valid (it is either valid or NULL). * the slab_mutex must be held when looping through those caches */ #define for_each_memcg_cache_index(_idx) \ for ((_idx) = 0; (_idx) < memcg_nr_cache_ids; (_idx)++) static inline bool memcg_kmem_enabled(void) { return static_key_false(&memcg_kmem_enabled_key); } static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg) { return memcg->kmem_acct_active; } /* * In general, we'll do everything in our power to not incur in any overhead * for non-memcg users for the kmem functions. Not even a function call, if we * can avoid it. * * Therefore, we'll inline all those functions so that in the best case, we'll * see that kmemcg is off for everybody and proceed quickly. If it is on, * we'll still do most of the flag checking inline. We check a lot of * conditions, but because they are pretty simple, they are expected to be * fast. */ int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order, struct mem_cgroup *memcg); int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order); void __memcg_kmem_uncharge(struct page *page, int order); /* * helper for acessing a memcg's index. It will be used as an index in the * child cache array in kmem_cache, and also to derive its name. This function * will return -1 when this is not a kmem-limited memcg. */ static inline int memcg_cache_id(struct mem_cgroup *memcg) { return memcg ? memcg->kmemcg_id : -1; } struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep); void __memcg_kmem_put_cache(struct kmem_cache *cachep); static inline bool __memcg_kmem_bypass(gfp_t gfp) { if (!memcg_kmem_enabled()) return true; if (gfp & __GFP_NOACCOUNT) return true; if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) return true; return false; } /** * memcg_kmem_charge: charge a kmem page * @page: page to charge * @gfp: reclaim mode * @order: allocation order * * Returns 0 on success, an error code on failure. */ static __always_inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order) { if (__memcg_kmem_bypass(gfp)) return 0; return __memcg_kmem_charge(page, gfp, order); } /** * memcg_kmem_uncharge: uncharge a kmem page * @page: page to uncharge * @order: allocation order */ static __always_inline void memcg_kmem_uncharge(struct page *page, int order) { if (memcg_kmem_enabled()) __memcg_kmem_uncharge(page, order); } /** * memcg_kmem_get_cache: selects the correct per-memcg cache for allocation * @cachep: the original global kmem cache * @gfp: allocation flags. * * All memory allocated from a per-memcg cache is charged to the owner memcg. */ static __always_inline struct kmem_cache * memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) { if (__memcg_kmem_bypass(gfp)) return cachep; return __memcg_kmem_get_cache(cachep); } static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep) { if (memcg_kmem_enabled()) __memcg_kmem_put_cache(cachep); } #else #define for_each_memcg_cache_index(_idx) \ for (; NULL; ) static inline bool memcg_kmem_enabled(void) { return false; } static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg) { return false; } static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order) { return 0; } static inline void memcg_kmem_uncharge(struct page *page, int order) { } static inline int memcg_cache_id(struct mem_cgroup *memcg) { return -1; } static inline void memcg_get_cache_ids(void) { } static inline void memcg_put_cache_ids(void) { } static inline struct kmem_cache * memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) { return cachep; } static inline void memcg_kmem_put_cache(struct kmem_cache *cachep) { } #endif /* CONFIG_MEMCG_KMEM */ #endif /* _LINUX_MEMCONTROL_H */