--- /dev/null
+/* 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>
+
+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_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,
+};
+
+#ifdef CONFIG_MEMCG
+void mem_cgroup_events(struct mem_cgroup *memcg,
+ enum mem_cgroup_events_index idx,
+ unsigned int nr);
+
+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_migrate(struct page *oldpage, struct page *newpage,
+ bool lrucare);
+
+struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
+struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
+
+bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
+ struct mem_cgroup *root);
+bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
+
+extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
+extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
+
+extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
+extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css);
+
+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;
+}
+
+extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
+
+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 *);
+
+/*
+ * For memory reclaim.
+ */
+int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec);
+bool mem_cgroup_lruvec_online(struct lruvec *lruvec);
+int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
+unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
+void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
+extern 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_oom.may_oom);
+ current->memcg_oom.may_oom = 1;
+}
+
+static inline void mem_cgroup_oom_disable(void)
+{
+ WARN_ON(!current->memcg_oom.may_oom);
+ current->memcg_oom.may_oom = 0;
+}
+
+static inline bool task_in_memcg_oom(struct task_struct *p)
+{
+ return p->memcg_oom.memcg;
+}
+
+bool mem_cgroup_oom_synchronize(bool wait);
+
+#ifdef CONFIG_MEMCG_SWAP
+extern int do_swap_account;
+#endif
+
+static inline bool mem_cgroup_disabled(void)
+{
+ if (memory_cgrp_subsys.disabled)
+ return true;
+ return false;
+}
+
+struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page);
+void mem_cgroup_update_page_stat(struct mem_cgroup *memcg,
+ enum mem_cgroup_stat_index idx, int val);
+void mem_cgroup_end_page_stat(struct mem_cgroup *memcg);
+
+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);
+
+void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx);
+static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
+ enum vm_event_item idx)
+{
+ if (mem_cgroup_disabled())
+ return;
+ __mem_cgroup_count_vm_event(mm, idx);
+}
+#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_migrate(struct page *oldpage,
+ struct page *newpage,
+ bool lrucare)
+{
+}
+
+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 struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
+{
+ return NULL;
+}
+
+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 cgroup_subsys_state
+ *mem_cgroup_css(struct mem_cgroup *memcg)
+{
+ return NULL;
+}
+
+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 int
+mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
+{
+ return 1;
+}
+
+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_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,
+};
+
+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;
+extern void memcg_get_cache_ids(void);
+extern 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);
+}
+
+bool memcg_kmem_is_active(struct mem_cgroup *memcg);
+
+/*
+ * 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.
+ */
+bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
+ int order);
+void __memcg_kmem_commit_charge(struct page *page,
+ struct mem_cgroup *memcg, int order);
+void __memcg_kmem_uncharge_pages(struct page *page, int order);
+
+int memcg_cache_id(struct mem_cgroup *memcg);
+
+struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep);
+void __memcg_kmem_put_cache(struct kmem_cache *cachep);
+
+struct mem_cgroup *__mem_cgroup_from_kmem(void *ptr);
+
+int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp,
+ unsigned long nr_pages);
+void memcg_uncharge_kmem(struct mem_cgroup *memcg, unsigned long nr_pages);
+
+/**
+ * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
+ * @gfp: the gfp allocation flags.
+ * @memcg: a pointer to the memcg this was charged against.
+ * @order: allocation order.
+ *
+ * returns true if the memcg where the current task belongs can hold this
+ * allocation.
+ *
+ * We return true automatically if this allocation is not to be accounted to
+ * any memcg.
+ */
+static inline bool
+memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
+{
+ if (!memcg_kmem_enabled())
+ return true;
+
+ if (gfp & __GFP_NOACCOUNT)
+ return true;
+ /*
+ * __GFP_NOFAIL allocations will move on even if charging is not
+ * possible. Therefore we don't even try, and have this allocation
+ * unaccounted. We could in theory charge it forcibly, but we hope
+ * those allocations are rare, and won't be worth the trouble.
+ */
+ if (gfp & __GFP_NOFAIL)
+ return true;
+ if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
+ return true;
+
+ /* If the test is dying, just let it go. */
+ if (unlikely(fatal_signal_pending(current)))
+ return true;
+
+ return __memcg_kmem_newpage_charge(gfp, memcg, order);
+}
+
+/**
+ * memcg_kmem_uncharge_pages: uncharge pages from memcg
+ * @page: pointer to struct page being freed
+ * @order: allocation order.
+ */
+static inline void
+memcg_kmem_uncharge_pages(struct page *page, int order)
+{
+ if (memcg_kmem_enabled())
+ __memcg_kmem_uncharge_pages(page, order);
+}
+
+/**
+ * memcg_kmem_commit_charge: embeds correct memcg in a page
+ * @page: pointer to struct page recently allocated
+ * @memcg: the memcg structure we charged against
+ * @order: allocation order.
+ *
+ * Needs to be called after memcg_kmem_newpage_charge, regardless of success or
+ * failure of the allocation. if @page is NULL, this function will revert the
+ * charges. Otherwise, it will commit @page to @memcg.
+ */
+static inline void
+memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
+{
+ if (memcg_kmem_enabled() && memcg)
+ __memcg_kmem_commit_charge(page, memcg, 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_enabled())
+ return cachep;
+ if (gfp & __GFP_NOACCOUNT)
+ return cachep;
+ if (gfp & __GFP_NOFAIL)
+ return cachep;
+ if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
+ return cachep;
+ if (unlikely(fatal_signal_pending(current)))
+ 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);
+}
+
+static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
+{
+ if (!memcg_kmem_enabled())
+ return NULL;
+ return __mem_cgroup_from_kmem(ptr);
+}
+#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 bool
+memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
+{
+ return true;
+}
+
+static inline void memcg_kmem_uncharge_pages(struct page *page, int order)
+{
+}
+
+static inline void
+memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, 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)
+{
+}
+
+static inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
+{
+ return NULL;
+}
+#endif /* CONFIG_MEMCG_KMEM */
+#endif /* _LINUX_MEMCONTROL_H */
+
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