memcg: only free spare array when readers are done

[pandora-kernel.git] / mm / memcontrol.c

/* memcontrol.c - 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>
 *
 * Memory thresholds
 * Copyright (C) 2009 Nokia Corporation
 * Author: Kirill A. Shutemov
 *
 * 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.
 */

#include <linux/res_counter.h>
#include <linux/memcontrol.h>
#include <linux/cgroup.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/pagemap.h>
#include <linux/smp.h>
#include <linux/page-flags.h>
#include <linux/backing-dev.h>
#include <linux/bit_spinlock.h>
#include <linux/rcupdate.h>
#include <linux/limits.h>
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/rbtree.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/spinlock.h>
#include <linux/eventfd.h>
#include <linux/sort.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/vmalloc.h>
#include <linux/mm_inline.h>
#include <linux/page_cgroup.h>
#include <linux/cpu.h>
#include <linux/oom.h>
#include "internal.h"

#include <asm/uaccess.h>

#include <trace/events/vmscan.h>

struct cgroup_subsys mem_cgroup_subsys __read_mostly;
#define MEM_CGROUP_RECLAIM_RETRIES      5
struct mem_cgroup *root_mem_cgroup __read_mostly;

#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
/* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */
int do_swap_account __read_mostly;

/* for remember boot option*/
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED
static int really_do_swap_account __initdata = 1;
#else
static int really_do_swap_account __initdata = 0;
#endif

#else
#define do_swap_account         (0)
#endif


/*
 * Statistics for memory cgroup.
 */
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_FILE_MAPPED,  /* # of pages charged as file rss */
        MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
        MEM_CGROUP_STAT_DATA, /* end of data requires synchronization */
        MEM_CGROUP_ON_MOVE,     /* someone is moving account between groups */
        MEM_CGROUP_STAT_NSTATS,
};

enum mem_cgroup_events_index {
        MEM_CGROUP_EVENTS_PGPGIN,       /* # of pages paged in */
        MEM_CGROUP_EVENTS_PGPGOUT,      /* # of pages paged out */
        MEM_CGROUP_EVENTS_COUNT,        /* # of pages paged in/out */
        MEM_CGROUP_EVENTS_PGFAULT,      /* # of page-faults */
        MEM_CGROUP_EVENTS_PGMAJFAULT,   /* # of major page-faults */
        MEM_CGROUP_EVENTS_NSTATS,
};
/*
 * 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,
};
#define THRESHOLDS_EVENTS_TARGET (128)
#define SOFTLIMIT_EVENTS_TARGET (1024)
#define NUMAINFO_EVENTS_TARGET  (1024)

struct mem_cgroup_stat_cpu {
        long count[MEM_CGROUP_STAT_NSTATS];
        unsigned long events[MEM_CGROUP_EVENTS_NSTATS];
        unsigned long targets[MEM_CGROUP_NTARGETS];
};

/*
 * per-zone information in memory controller.
 */
struct mem_cgroup_per_zone {
        /*
         * spin_lock to protect the per cgroup LRU
         */
        struct list_head        lists[NR_LRU_LISTS];
        unsigned long           count[NR_LRU_LISTS];

        struct zone_reclaim_stat reclaim_stat;
        struct rb_node          tree_node;      /* RB tree node */
        unsigned long long      usage_in_excess;/* Set to the value by which */
                                                /* the soft limit is exceeded*/
        bool                    on_tree;
        struct mem_cgroup       *mem;           /* Back pointer, we cannot */
                                                /* use container_of        */
};
/* Macro for accessing counter */
#define MEM_CGROUP_ZSTAT(mz, idx)       ((mz)->count[(idx)])

struct mem_cgroup_per_node {
        struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES];
};

struct mem_cgroup_lru_info {
        struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES];
};

/*
 * Cgroups above their limits are maintained in a RB-Tree, independent of
 * their hierarchy representation
 */

struct mem_cgroup_tree_per_zone {
        struct rb_root rb_root;
        spinlock_t lock;
};

struct mem_cgroup_tree_per_node {
        struct mem_cgroup_tree_per_zone rb_tree_per_zone[MAX_NR_ZONES];
};

struct mem_cgroup_tree {
        struct mem_cgroup_tree_per_node *rb_tree_per_node[MAX_NUMNODES];
};

static struct mem_cgroup_tree soft_limit_tree __read_mostly;

struct mem_cgroup_threshold {
        struct eventfd_ctx *eventfd;
        u64 threshold;
};

/* For threshold */
struct mem_cgroup_threshold_ary {
        /* An array index points to threshold just below 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;
};

/* for OOM */
struct mem_cgroup_eventfd_list {
        struct list_head list;
        struct eventfd_ctx *eventfd;
};

static void mem_cgroup_threshold(struct mem_cgroup *memcg);
static void mem_cgroup_oom_notify(struct mem_cgroup *memcg);

/*
 * 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.
 *
 * TODO: Add a water mark for the memory controller. Reclaim will begin when
 * we hit the water mark. May be even add a low water mark, such that
 * no reclaim occurs from a cgroup at it's low water mark, this is
 * a feature that will be implemented much later in the future.
 */
struct mem_cgroup {
        struct cgroup_subsys_state css;
        /*
         * the counter to account for memory usage
         */
        struct res_counter res;
        /*
         * the counter to account for mem+swap usage.
         */
        struct res_counter memsw;
        /*
         * Per cgroup active and inactive list, similar to the
         * per zone LRU lists.
         */
        struct mem_cgroup_lru_info info;
        /*
         * While reclaiming in a hierarchy, we cache the last child we
         * reclaimed from.
         */
        int last_scanned_child;
        int last_scanned_node;
#if MAX_NUMNODES > 1
        nodemask_t      scan_nodes;
        atomic_t        numainfo_events;
        atomic_t        numainfo_updating;
#endif
        /*
         * Should the accounting and control be hierarchical, per subtree?
         */
        bool use_hierarchy;

        bool            oom_lock;
        atomic_t        under_oom;

        atomic_t        refcnt;

        int     swappiness;
        /* OOM-Killer disable */
        int             oom_kill_disable;

        /* set when res.limit == memsw.limit */
        bool            memsw_is_minimum;

        /* 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;
        /*
         * percpu counter.
         */
        struct mem_cgroup_stat_cpu *stat;
        /*
         * used when a cpu is offlined or other synchronizations
         * See mem_cgroup_read_stat().
         */
        struct mem_cgroup_stat_cpu nocpu_base;
        spinlock_t pcp_counter_lock;
};

/* Stuffs for move charges at task migration. */
/*
 * Types of charges to be moved. "move_charge_at_immitgrate" is treated as a
 * left-shifted bitmap of these types.
 */
enum move_type {
        MOVE_CHARGE_TYPE_ANON,  /* private anonymous page and swap of it */
        MOVE_CHARGE_TYPE_FILE,  /* file page(including tmpfs) and swap of it */
        NR_MOVE_TYPE,
};

/* "mc" and its members are protected by cgroup_mutex */
static struct move_charge_struct {
        spinlock_t        lock; /* for from, to */
        struct mem_cgroup *from;
        struct mem_cgroup *to;
        unsigned long precharge;
        unsigned long moved_charge;
        unsigned long moved_swap;
        struct task_struct *moving_task;        /* a task moving charges */
        wait_queue_head_t waitq;                /* a waitq for other context */
} mc = {
        .lock = __SPIN_LOCK_UNLOCKED(mc.lock),
        .waitq = __WAIT_QUEUE_HEAD_INITIALIZER(mc.waitq),
};

static bool move_anon(void)
{
        return test_bit(MOVE_CHARGE_TYPE_ANON,
                                        &mc.to->move_charge_at_immigrate);
}

static bool move_file(void)
{
        return test_bit(MOVE_CHARGE_TYPE_FILE,
                                        &mc.to->move_charge_at_immigrate);
}

/*
 * Maximum loops in mem_cgroup_hierarchical_reclaim(), used for soft
 * limit reclaim to prevent infinite loops, if they ever occur.
 */
#define MEM_CGROUP_MAX_RECLAIM_LOOPS            (100)
#define MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS (2)

enum charge_type {
        MEM_CGROUP_CHARGE_TYPE_CACHE = 0,
        MEM_CGROUP_CHARGE_TYPE_MAPPED,
        MEM_CGROUP_CHARGE_TYPE_SHMEM,   /* used by page migration of shmem */
        MEM_CGROUP_CHARGE_TYPE_FORCE,   /* used by force_empty */
        MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */
        MEM_CGROUP_CHARGE_TYPE_DROP,    /* a page was unused swap cache */
        NR_CHARGE_TYPE,
};

/* for encoding cft->private value on file */
#define _MEM                    (0)
#define _MEMSWAP                (1)
#define _OOM_TYPE               (2)
#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
#define MEMFILE_TYPE(val)       (((val) >> 16) & 0xffff)
#define MEMFILE_ATTR(val)       ((val) & 0xffff)
/* Used for OOM nofiier */
#define OOM_CONTROL             (0)

/*
 * Reclaim flags for mem_cgroup_hierarchical_reclaim
 */
#define MEM_CGROUP_RECLAIM_NOSWAP_BIT   0x0
#define MEM_CGROUP_RECLAIM_NOSWAP       (1 << MEM_CGROUP_RECLAIM_NOSWAP_BIT)
#define MEM_CGROUP_RECLAIM_SHRINK_BIT   0x1
#define MEM_CGROUP_RECLAIM_SHRINK       (1 << MEM_CGROUP_RECLAIM_SHRINK_BIT)
#define MEM_CGROUP_RECLAIM_SOFT_BIT     0x2
#define MEM_CGROUP_RECLAIM_SOFT         (1 << MEM_CGROUP_RECLAIM_SOFT_BIT)

static void mem_cgroup_get(struct mem_cgroup *memcg);
static void mem_cgroup_put(struct mem_cgroup *memcg);
static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
static void drain_all_stock_async(struct mem_cgroup *memcg);

static struct mem_cgroup_per_zone *
mem_cgroup_zoneinfo(struct mem_cgroup *memcg, int nid, int zid)
{
        return &memcg->info.nodeinfo[nid]->zoneinfo[zid];
}

struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg)
{
        return &memcg->css;
}

static struct mem_cgroup_per_zone *
page_cgroup_zoneinfo(struct mem_cgroup *memcg, struct page *page)
{
        int nid = page_to_nid(page);
        int zid = page_zonenum(page);

        return mem_cgroup_zoneinfo(memcg, nid, zid);
}

static struct mem_cgroup_tree_per_zone *
soft_limit_tree_node_zone(int nid, int zid)
{
        return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid];
}

static struct mem_cgroup_tree_per_zone *
soft_limit_tree_from_page(struct page *page)
{
        int nid = page_to_nid(page);
        int zid = page_zonenum(page);

        return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid];
}

static void
__mem_cgroup_insert_exceeded(struct mem_cgroup *memcg,
                                struct mem_cgroup_per_zone *mz,
                                struct mem_cgroup_tree_per_zone *mctz,
                                unsigned long long new_usage_in_excess)
{
        struct rb_node **p = &mctz->rb_root.rb_node;
        struct rb_node *parent = NULL;
        struct mem_cgroup_per_zone *mz_node;

        if (mz->on_tree)
                return;

        mz->usage_in_excess = new_usage_in_excess;
        if (!mz->usage_in_excess)
                return;
        while (*p) {
                parent = *p;
                mz_node = rb_entry(parent, struct mem_cgroup_per_zone,
                                        tree_node);
                if (mz->usage_in_excess < mz_node->usage_in_excess)
                        p = &(*p)->rb_left;
                /*
                 * We can't avoid mem cgroups that are over their soft
                 * limit by the same amount
                 */
                else if (mz->usage_in_excess >= mz_node->usage_in_excess)
                        p = &(*p)->rb_right;
        }
        rb_link_node(&mz->tree_node, parent, p);
        rb_insert_color(&mz->tree_node, &mctz->rb_root);
        mz->on_tree = true;
}

static void
__mem_cgroup_remove_exceeded(struct mem_cgroup *memcg,
                                struct mem_cgroup_per_zone *mz,
                                struct mem_cgroup_tree_per_zone *mctz)
{
        if (!mz->on_tree)
                return;
        rb_erase(&mz->tree_node, &mctz->rb_root);
        mz->on_tree = false;
}

static void
mem_cgroup_remove_exceeded(struct mem_cgroup *memcg,
                                struct mem_cgroup_per_zone *mz,
                                struct mem_cgroup_tree_per_zone *mctz)
{
        spin_lock(&mctz->lock);
        __mem_cgroup_remove_exceeded(memcg, mz, mctz);
        spin_unlock(&mctz->lock);
}


static void mem_cgroup_update_tree(struct mem_cgroup *memcg, struct page *page)
{
        unsigned long long excess;
        struct mem_cgroup_per_zone *mz;
        struct mem_cgroup_tree_per_zone *mctz;
        int nid = page_to_nid(page);
        int zid = page_zonenum(page);
        mctz = soft_limit_tree_from_page(page);

        /*
         * Necessary to update all ancestors when hierarchy is used.
         * because their event counter is not touched.
         */
        for (; memcg; memcg = parent_mem_cgroup(memcg)) {
                mz = mem_cgroup_zoneinfo(memcg, nid, zid);
                excess = res_counter_soft_limit_excess(&memcg->res);
                /*
                 * We have to update the tree if mz is on RB-tree or
                 * mem is over its softlimit.
                 */
                if (excess || mz->on_tree) {
                        spin_lock(&mctz->lock);
                        /* if on-tree, remove it */
                        if (mz->on_tree)
                                __mem_cgroup_remove_exceeded(memcg, mz, mctz);
                        /*
                         * Insert again. mz->usage_in_excess will be updated.
                         * If excess is 0, no tree ops.
                         */
                        __mem_cgroup_insert_exceeded(memcg, mz, mctz, excess);
                        spin_unlock(&mctz->lock);
                }
        }
}

static void mem_cgroup_remove_from_trees(struct mem_cgroup *memcg)
{
        int node, zone;
        struct mem_cgroup_per_zone *mz;
        struct mem_cgroup_tree_per_zone *mctz;

        for_each_node_state(node, N_POSSIBLE) {
                for (zone = 0; zone < MAX_NR_ZONES; zone++) {
                        mz = mem_cgroup_zoneinfo(memcg, node, zone);
                        mctz = soft_limit_tree_node_zone(node, zone);
                        mem_cgroup_remove_exceeded(memcg, mz, mctz);
                }
        }
}

static struct mem_cgroup_per_zone *
__mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
{
        struct rb_node *rightmost = NULL;
        struct mem_cgroup_per_zone *mz;

retry:
        mz = NULL;
        rightmost = rb_last(&mctz->rb_root);
        if (!rightmost)
                goto done;              /* Nothing to reclaim from */

        mz = rb_entry(rightmost, struct mem_cgroup_per_zone, tree_node);
        /*
         * Remove the node now but someone else can add it back,
         * we will to add it back at the end of reclaim to its correct
         * position in the tree.
         */
        __mem_cgroup_remove_exceeded(mz->mem, mz, mctz);
        if (!res_counter_soft_limit_excess(&mz->mem->res) ||
                !css_tryget(&mz->mem->css))
                goto retry;
done:
        return mz;
}

static struct mem_cgroup_per_zone *
mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
{
        struct mem_cgroup_per_zone *mz;

        spin_lock(&mctz->lock);
        mz = __mem_cgroup_largest_soft_limit_node(mctz);
        spin_unlock(&mctz->lock);
        return mz;
}

/*
 * Implementation Note: reading percpu statistics for memcg.
 *
 * Both of vmstat[] and percpu_counter has threshold and do periodic
 * synchronization to implement "quick" read. There are trade-off between
 * reading cost and precision of value. Then, we may have a chance to implement
 * a periodic synchronizion of counter in memcg's counter.
 *
 * But this _read() function is used for user interface now. The user accounts
 * memory usage by memory cgroup and he _always_ requires exact value because
 * he accounts memory. Even if we provide quick-and-fuzzy read, we always
 * have to visit all online cpus and make sum. So, for now, unnecessary
 * synchronization is not implemented. (just implemented for cpu hotplug)
 *
 * If there are kernel internal actions which can make use of some not-exact
 * value, and reading all cpu value can be performance bottleneck in some
 * common workload, threashold and synchonization as vmstat[] should be
 * implemented.
 */
static long mem_cgroup_read_stat(struct mem_cgroup *memcg,
                                 enum mem_cgroup_stat_index idx)
{
        long val = 0;
        int cpu;

        get_online_cpus();
        for_each_online_cpu(cpu)
                val += per_cpu(memcg->stat->count[idx], cpu);
#ifdef CONFIG_HOTPLUG_CPU
        spin_lock(&memcg->pcp_counter_lock);
        val += memcg->nocpu_base.count[idx];
        spin_unlock(&memcg->pcp_counter_lock);
#endif
        put_online_cpus();
        return val;
}

static void mem_cgroup_swap_statistics(struct mem_cgroup *memcg,
                                         bool charge)
{
        int val = (charge) ? 1 : -1;
        this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_SWAPOUT], val);
}

void mem_cgroup_pgfault(struct mem_cgroup *memcg, int val)
{
        this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT], val);
}

void mem_cgroup_pgmajfault(struct mem_cgroup *memcg, int val)
{
        this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT], val);
}

static unsigned long mem_cgroup_read_events(struct mem_cgroup *memcg,
                                            enum mem_cgroup_events_index idx)
{
        unsigned long val = 0;
        int cpu;

        for_each_online_cpu(cpu)
                val += per_cpu(memcg->stat->events[idx], cpu);
#ifdef CONFIG_HOTPLUG_CPU
        spin_lock(&memcg->pcp_counter_lock);
        val += memcg->nocpu_base.events[idx];
        spin_unlock(&memcg->pcp_counter_lock);
#endif
        return val;
}

static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
                                         bool file, int nr_pages)
{
        preempt_disable();

        if (file)
                __this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_CACHE],
                                nr_pages);
        else
                __this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_RSS],
                                nr_pages);

        /* pagein of a big page is an event. So, ignore page size */
        if (nr_pages > 0)
                __this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGIN]);
        else {
                __this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGOUT]);
                nr_pages = -nr_pages; /* for event */
        }

        __this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_COUNT], nr_pages);

        preempt_enable();
}

unsigned long
mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
                        unsigned int lru_mask)
{
        struct mem_cgroup_per_zone *mz;
        enum lru_list l;
        unsigned long ret = 0;

        mz = mem_cgroup_zoneinfo(memcg, nid, zid);

        for_each_lru(l) {
                if (BIT(l) & lru_mask)
                        ret += MEM_CGROUP_ZSTAT(mz, l);
        }
        return ret;
}

static unsigned long
mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
                        int nid, unsigned int lru_mask)
{
        u64 total = 0;
        int zid;

        for (zid = 0; zid < MAX_NR_ZONES; zid++)
                total += mem_cgroup_zone_nr_lru_pages(memcg,
                                                nid, zid, lru_mask);

        return total;
}

static unsigned long mem_cgroup_nr_lru_pages(struct mem_cgroup *memcg,
                        unsigned int lru_mask)
{
        int nid;
        u64 total = 0;

        for_each_node_state(nid, N_HIGH_MEMORY)
                total += mem_cgroup_node_nr_lru_pages(memcg, nid, lru_mask);
        return total;
}

static bool __memcg_event_check(struct mem_cgroup *memcg, int target)
{
        unsigned long val, next;

        val = __this_cpu_read(memcg->stat->events[MEM_CGROUP_EVENTS_COUNT]);
        next = __this_cpu_read(memcg->stat->targets[target]);
        /* from time_after() in jiffies.h */
        return ((long)next - (long)val < 0);
}

static void __mem_cgroup_target_update(struct mem_cgroup *memcg, int target)
{
        unsigned long val, next;

        val = __this_cpu_read(memcg->stat->events[MEM_CGROUP_EVENTS_COUNT]);

        switch (target) {
        case MEM_CGROUP_TARGET_THRESH:
                next = val + THRESHOLDS_EVENTS_TARGET;
                break;
        case MEM_CGROUP_TARGET_SOFTLIMIT:
                next = val + SOFTLIMIT_EVENTS_TARGET;
                break;
        case MEM_CGROUP_TARGET_NUMAINFO:
                next = val + NUMAINFO_EVENTS_TARGET;
                break;
        default:
                return;
        }

        __this_cpu_write(memcg->stat->targets[target], next);
}

/*
 * Check events in order.
 *
 */
static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
{
        preempt_disable();
        /* threshold event is triggered in finer grain than soft limit */
        if (unlikely(__memcg_event_check(memcg, MEM_CGROUP_TARGET_THRESH))) {
                mem_cgroup_threshold(memcg);
                __mem_cgroup_target_update(memcg, MEM_CGROUP_TARGET_THRESH);
                if (unlikely(__memcg_event_check(memcg,
                             MEM_CGROUP_TARGET_SOFTLIMIT))) {
                        mem_cgroup_update_tree(memcg, page);
                        __mem_cgroup_target_update(memcg,
                                                   MEM_CGROUP_TARGET_SOFTLIMIT);
                }
#if MAX_NUMNODES > 1
                if (unlikely(__memcg_event_check(memcg,
                        MEM_CGROUP_TARGET_NUMAINFO))) {
                        atomic_inc(&memcg->numainfo_events);
                        __mem_cgroup_target_update(memcg,
                                MEM_CGROUP_TARGET_NUMAINFO);
                }
#endif
        }
        preempt_enable();
}

static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
{
        return container_of(cgroup_subsys_state(cont,
                                mem_cgroup_subsys_id), struct mem_cgroup,
                                css);
}

struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
{
        /*
         * mm_update_next_owner() may clear mm->owner to NULL
         * if it races with swapoff, page migration, etc.
         * So this can be called with p == NULL.
         */
        if (unlikely(!p))
                return NULL;

        return container_of(task_subsys_state(p, mem_cgroup_subsys_id),
                                struct mem_cgroup, css);
}

struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
{
        struct mem_cgroup *memcg = NULL;

        if (!mm)
                return NULL;
        /*
         * Because we have no locks, mm->owner's may be being moved to other
         * cgroup. We use css_tryget() here even if this looks
         * pessimistic (rather than adding locks here).
         */
        rcu_read_lock();
        do {
                memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
                if (unlikely(!memcg))
                        break;
        } while (!css_tryget(&memcg->css));
        rcu_read_unlock();
        return memcg;
}

/* The caller has to guarantee "mem" exists before calling this */
static struct mem_cgroup *mem_cgroup_start_loop(struct mem_cgroup *memcg)
{
        struct cgroup_subsys_state *css;
        int found;

        if (!memcg) /* ROOT cgroup has the smallest ID */
                return root_mem_cgroup; /*css_put/get against root is ignored*/
        if (!memcg->use_hierarchy) {
                if (css_tryget(&memcg->css))
                        return memcg;
                return NULL;
        }
        rcu_read_lock();
        /*
         * searching a memory cgroup which has the smallest ID under given
         * ROOT cgroup. (ID >= 1)
         */
        css = css_get_next(&mem_cgroup_subsys, 1, &memcg->css, &found);
        if (css && css_tryget(css))
                memcg = container_of(css, struct mem_cgroup, css);
        else
                memcg = NULL;
        rcu_read_unlock();
        return memcg;
}

static struct mem_cgroup *mem_cgroup_get_next(struct mem_cgroup *iter,
                                        struct mem_cgroup *root,
                                        bool cond)
{
        int nextid = css_id(&iter->css) + 1;
        int found;
        int hierarchy_used;
        struct cgroup_subsys_state *css;

        hierarchy_used = iter->use_hierarchy;

        css_put(&iter->css);
        /* If no ROOT, walk all, ignore hierarchy */
        if (!cond || (root && !hierarchy_used))
                return NULL;

        if (!root)
                root = root_mem_cgroup;

        do {
                iter = NULL;
                rcu_read_lock();

                css = css_get_next(&mem_cgroup_subsys, nextid,
                                &root->css, &found);
                if (css && css_tryget(css))
                        iter = container_of(css, struct mem_cgroup, css);
                rcu_read_unlock();
                /* If css is NULL, no more cgroups will be found */
                nextid = found + 1;
        } while (css && !iter);

        return iter;
}
/*
 * for_eacn_mem_cgroup_tree() for visiting all cgroup under tree. Please
 * be careful that "break" loop is not allowed. We have reference count.
 * Instead of that modify "cond" to be false and "continue" to exit the loop.
 */
#define for_each_mem_cgroup_tree_cond(iter, root, cond) \
        for (iter = mem_cgroup_start_loop(root);\
             iter != NULL;\
             iter = mem_cgroup_get_next(iter, root, cond))

#define for_each_mem_cgroup_tree(iter, root) \
        for_each_mem_cgroup_tree_cond(iter, root, true)

#define for_each_mem_cgroup_all(iter) \
        for_each_mem_cgroup_tree_cond(iter, NULL, true)


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

void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
{
        struct mem_cgroup *memcg;

        if (!mm)
                return;

        rcu_read_lock();
        memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
        if (unlikely(!memcg))
                goto out;

        switch (idx) {
        case PGMAJFAULT:
                mem_cgroup_pgmajfault(memcg, 1);
                break;
        case PGFAULT:
                mem_cgroup_pgfault(memcg, 1);
                break;
        default:
                BUG();
        }
out:
        rcu_read_unlock();
}
EXPORT_SYMBOL(mem_cgroup_count_vm_event);

/*
 * Following LRU functions are allowed to be used without PCG_LOCK.
 * Operations are called by routine of global LRU independently from memcg.
 * What we have to take care of here is validness of pc->mem_cgroup.
 *
 * Changes to pc->mem_cgroup happens when
 * 1. charge
 * 2. moving account
 * In typical case, "charge" is done before add-to-lru. Exception is SwapCache.
 * It is added to LRU before charge.
 * If PCG_USED bit is not set, page_cgroup is not added to this private LRU.
 * When moving account, the page is not on LRU. It's isolated.
 */

void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru)
{
        struct page_cgroup *pc;
        struct mem_cgroup_per_zone *mz;

        if (mem_cgroup_disabled())
                return;
        pc = lookup_page_cgroup(page);
        /* can happen while we handle swapcache. */
        if (!TestClearPageCgroupAcctLRU(pc))
                return;
        VM_BUG_ON(!pc->mem_cgroup);
        /*
         * We don't check PCG_USED bit. It's cleared when the "page" is finally
         * removed from global LRU.
         */
        mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
        /* huge page split is done under lru_lock. so, we have no races. */
        MEM_CGROUP_ZSTAT(mz, lru) -= 1 << compound_order(page);
        if (mem_cgroup_is_root(pc->mem_cgroup))
                return;
        VM_BUG_ON(list_empty(&pc->lru));
        list_del_init(&pc->lru);
}

void mem_cgroup_del_lru(struct page *page)
{
        mem_cgroup_del_lru_list(page, page_lru(page));
}

/*
 * Writeback is about to end against a page which has been marked for immediate
 * reclaim.  If it still appears to be reclaimable, move it to the tail of the
 * inactive list.
 */
void mem_cgroup_rotate_reclaimable_page(struct page *page)
{
        struct mem_cgroup_per_zone *mz;
        struct page_cgroup *pc;
        enum lru_list lru = page_lru(page);

        if (mem_cgroup_disabled())
                return;

        pc = lookup_page_cgroup(page);
        /* unused or root page is not rotated. */
        if (!PageCgroupUsed(pc))
                return;
        /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
        smp_rmb();
        if (mem_cgroup_is_root(pc->mem_cgroup))
                return;
        mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
        list_move_tail(&pc->lru, &mz->lists[lru]);
}

void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru)
{
        struct mem_cgroup_per_zone *mz;
        struct page_cgroup *pc;

        if (mem_cgroup_disabled())
                return;

        pc = lookup_page_cgroup(page);
        /* unused or root page is not rotated. */
        if (!PageCgroupUsed(pc))
                return;
        /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
        smp_rmb();
        if (mem_cgroup_is_root(pc->mem_cgroup))
                return;
        mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
        list_move(&pc->lru, &mz->lists[lru]);
}

void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru)
{
        struct page_cgroup *pc;
        struct mem_cgroup_per_zone *mz;

        if (mem_cgroup_disabled())
                return;
        pc = lookup_page_cgroup(page);
        VM_BUG_ON(PageCgroupAcctLRU(pc));
        /*
         * putback:                             charge:
         * SetPageLRU                           SetPageCgroupUsed
         * smp_mb                               smp_mb
         * PageCgroupUsed && add to memcg LRU   PageLRU && add to memcg LRU
         *
         * Ensure that one of the two sides adds the page to the memcg
         * LRU during a race.
         */
        smp_mb();
        if (!PageCgroupUsed(pc))
                return;
        /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
        smp_rmb();
        mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
        /* huge page split is done under lru_lock. so, we have no races. */
        MEM_CGROUP_ZSTAT(mz, lru) += 1 << compound_order(page);
        SetPageCgroupAcctLRU(pc);
        if (mem_cgroup_is_root(pc->mem_cgroup))
                return;
        list_add(&pc->lru, &mz->lists[lru]);
}

/*
 * At handling SwapCache and other FUSE stuff, pc->mem_cgroup may be changed
 * while it's linked to lru because the page may be reused after it's fully
 * uncharged. To handle that, unlink page_cgroup from LRU when charge it again.
 * It's done under lock_page and expected that zone->lru_lock isnever held.
 */
static void mem_cgroup_lru_del_before_commit(struct page *page)
{
        unsigned long flags;
        struct zone *zone = page_zone(page);
        struct page_cgroup *pc = lookup_page_cgroup(page);

        /*
         * Doing this check without taking ->lru_lock seems wrong but this
         * is safe. Because if page_cgroup's USED bit is unset, the page
         * will not be added to any memcg's LRU. If page_cgroup's USED bit is
         * set, the commit after this will fail, anyway.
         * This all charge/uncharge is done under some mutual execustion.
         * So, we don't need to taking care of changes in USED bit.
         */
        if (likely(!PageLRU(page)))
                return;

        spin_lock_irqsave(&zone->lru_lock, flags);
        /*
         * Forget old LRU when this page_cgroup is *not* used. This Used bit
         * is guarded by lock_page() because the page is SwapCache.
         */
        if (!PageCgroupUsed(pc))
                mem_cgroup_del_lru_list(page, page_lru(page));
        spin_unlock_irqrestore(&zone->lru_lock, flags);
}

static void mem_cgroup_lru_add_after_commit(struct page *page)
{
        unsigned long flags;
        struct zone *zone = page_zone(page);
        struct page_cgroup *pc = lookup_page_cgroup(page);
        /*
         * putback:                             charge:
         * SetPageLRU                           SetPageCgroupUsed
         * smp_mb                               smp_mb
         * PageCgroupUsed && add to memcg LRU   PageLRU && add to memcg LRU
         *
         * Ensure that one of the two sides adds the page to the memcg
         * LRU during a race.
         */
        smp_mb();
        /* taking care of that the page is added to LRU while we commit it */
        if (likely(!PageLRU(page)))
                return;
        spin_lock_irqsave(&zone->lru_lock, flags);
        /* link when the page is linked to LRU but page_cgroup isn't */
        if (PageLRU(page) && !PageCgroupAcctLRU(pc))
                mem_cgroup_add_lru_list(page, page_lru(page));
        spin_unlock_irqrestore(&zone->lru_lock, flags);
}


void mem_cgroup_move_lists(struct page *page,
                           enum lru_list from, enum lru_list to)
{
        if (mem_cgroup_disabled())
                return;
        mem_cgroup_del_lru_list(page, from);
        mem_cgroup_add_lru_list(page, to);
}

/*
 * Checks whether given mem is same or in the root_mem_cgroup's
 * hierarchy subtree
 */
static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
                struct mem_cgroup *memcg)
{
        if (root_memcg != memcg) {
                return (root_memcg->use_hierarchy &&
                        css_is_ancestor(&memcg->css, &root_memcg->css));
        }

        return true;
}

int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg)
{
        int ret;
        struct mem_cgroup *curr = NULL;
        struct task_struct *p;

        p = find_lock_task_mm(task);
        if (!p)
                return 0;
        curr = try_get_mem_cgroup_from_mm(p->mm);
        task_unlock(p);
        if (!curr)
                return 0;
        /*
         * We should check use_hierarchy of "memcg" not "curr". Because checking
         * use_hierarchy of "curr" here make this function true if hierarchy is
         * enabled in "curr" and "curr" is a child of "memcg" in *cgroup*
         * hierarchy(even if use_hierarchy is disabled in "memcg").
         */
        ret = mem_cgroup_same_or_subtree(memcg, curr);
        css_put(&curr->css);
        return ret;
}

int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone)
{
        unsigned long inactive_ratio;
        int nid = zone_to_nid(zone);
        int zid = zone_idx(zone);
        unsigned long inactive;
        unsigned long active;
        unsigned long gb;

        inactive = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid,
                                                BIT(LRU_INACTIVE_ANON));
        active = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid,
                                              BIT(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;
}

int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg, struct zone *zone)
{
        unsigned long active;
        unsigned long inactive;
        int zid = zone_idx(zone);
        int nid = zone_to_nid(zone);

        inactive = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid,
                                                BIT(LRU_INACTIVE_FILE));
        active = mem_cgroup_zone_nr_lru_pages(memcg, nid, zid,
                                              BIT(LRU_ACTIVE_FILE));

        return (active > inactive);
}

struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
                                                      struct zone *zone)
{
        int nid = zone_to_nid(zone);
        int zid = zone_idx(zone);
        struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);

        return &mz->reclaim_stat;
}

struct zone_reclaim_stat *
mem_cgroup_get_reclaim_stat_from_page(struct page *page)
{
        struct page_cgroup *pc;
        struct mem_cgroup_per_zone *mz;

        if (mem_cgroup_disabled())
                return NULL;

        pc = lookup_page_cgroup(page);
        if (!PageCgroupUsed(pc))
                return NULL;
        /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
        smp_rmb();
        mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
        return &mz->reclaim_stat;
}

unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
                                        struct list_head *dst,
                                        unsigned long *scanned, int order,
                                        isolate_mode_t mode,
                                        struct zone *z,
                                        struct mem_cgroup *mem_cont,
                                        int active, int file)
{
        unsigned long nr_taken = 0;
        struct page *page;
        unsigned long scan;
        LIST_HEAD(pc_list);
        struct list_head *src;
        struct page_cgroup *pc, *tmp;
        int nid = zone_to_nid(z);
        int zid = zone_idx(z);
        struct mem_cgroup_per_zone *mz;
        int lru = LRU_FILE * file + active;
        int ret;

        BUG_ON(!mem_cont);
        mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
        src = &mz->lists[lru];

        scan = 0;
        list_for_each_entry_safe_reverse(pc, tmp, src, lru) {
                if (scan >= nr_to_scan)
                        break;

                if (unlikely(!PageCgroupUsed(pc)))
                        continue;

                page = lookup_cgroup_page(pc);

                if (unlikely(!PageLRU(page)))
                        continue;

                scan++;
                ret = __isolate_lru_page(page, mode, file);
                switch (ret) {
                case 0:
                        list_move(&page->lru, dst);
                        mem_cgroup_del_lru(page);
                        nr_taken += hpage_nr_pages(page);
                        break;
                case -EBUSY:
                        /* we don't affect global LRU but rotate in our LRU */
                        mem_cgroup_rotate_lru_list(page, page_lru(page));
                        break;
                default:
                        break;
                }
        }

        *scanned = scan;

        trace_mm_vmscan_memcg_isolate(0, nr_to_scan, scan, nr_taken,
                                      0, 0, 0, mode);

        return nr_taken;
}

#define mem_cgroup_from_res_counter(counter, member)    \
        container_of(counter, struct mem_cgroup, member)

/**
 * mem_cgroup_margin - calculate chargeable space of a memory cgroup
 * @mem: the memory cgroup
 *
 * Returns the maximum amount of memory @mem can be charged with, in
 * pages.
 */
static unsigned long mem_cgroup_margin(struct mem_cgroup *memcg)
{
        unsigned long long margin;

        margin = res_counter_margin(&memcg->res);
        if (do_swap_account)
                margin = min(margin, res_counter_margin(&memcg->memsw));
        return margin >> PAGE_SHIFT;
}

int mem_cgroup_swappiness(struct mem_cgroup *memcg)
{
        struct cgroup *cgrp = memcg->css.cgroup;

        /* root ? */
        if (cgrp->parent == NULL)
                return vm_swappiness;

        return memcg->swappiness;
}

static void mem_cgroup_start_move(struct mem_cgroup *memcg)
{
        int cpu;

        get_online_cpus();
        spin_lock(&memcg->pcp_counter_lock);
        for_each_online_cpu(cpu)
                per_cpu(memcg->stat->count[MEM_CGROUP_ON_MOVE], cpu) += 1;
        memcg->nocpu_base.count[MEM_CGROUP_ON_MOVE] += 1;
        spin_unlock(&memcg->pcp_counter_lock);
        put_online_cpus();

        synchronize_rcu();
}

static void mem_cgroup_end_move(struct mem_cgroup *memcg)
{
        int cpu;

        if (!memcg)
                return;
        get_online_cpus();
        spin_lock(&memcg->pcp_counter_lock);
        for_each_online_cpu(cpu)
                per_cpu(memcg->stat->count[MEM_CGROUP_ON_MOVE], cpu) -= 1;
        memcg->nocpu_base.count[MEM_CGROUP_ON_MOVE] -= 1;
        spin_unlock(&memcg->pcp_counter_lock);
        put_online_cpus();
}
/*
 * 2 routines for checking "mem" is under move_account() or not.
 *
 * mem_cgroup_stealed() - checking a cgroup is mc.from or not. This is used
 *                        for avoiding race in accounting. If true,
 *                        pc->mem_cgroup may be overwritten.
 *
 * mem_cgroup_under_move() - checking a cgroup is mc.from or mc.to or
 *                        under hierarchy of moving cgroups. This is for
 *                        waiting at hith-memory prressure caused by "move".
 */

static bool mem_cgroup_stealed(struct mem_cgroup *memcg)
{
        VM_BUG_ON(!rcu_read_lock_held());
        return this_cpu_read(memcg->stat->count[MEM_CGROUP_ON_MOVE]) > 0;
}

static bool mem_cgroup_under_move(struct mem_cgroup *memcg)
{
        struct mem_cgroup *from;
        struct mem_cgroup *to;
        bool ret = false;
        /*
         * Unlike task_move routines, we access mc.to, mc.from not under
         * mutual exclusion by cgroup_mutex. Here, we take spinlock instead.
         */
        spin_lock(&mc.lock);
        from = mc.from;
        to = mc.to;
        if (!from)
                goto unlock;

        ret = mem_cgroup_same_or_subtree(memcg, from)
                || mem_cgroup_same_or_subtree(memcg, to);
unlock:
        spin_unlock(&mc.lock);
        return ret;
}

static bool mem_cgroup_wait_acct_move(struct mem_cgroup *memcg)
{
        if (mc.moving_task && current != mc.moving_task) {
                if (mem_cgroup_under_move(memcg)) {
                        DEFINE_WAIT(wait);
                        prepare_to_wait(&mc.waitq, &wait, TASK_INTERRUPTIBLE);
                        /* moving charge context might have finished. */
                        if (mc.moving_task)
                                schedule();
                        finish_wait(&mc.waitq, &wait);
                        return true;
                }
        }
        return false;
}

/**
 * mem_cgroup_print_oom_info: Called from OOM with tasklist_lock held in read mode.
 * @memcg: The memory cgroup that went over limit
 * @p: Task that is going to be killed
 *
 * NOTE: @memcg and @p's mem_cgroup can be different when hierarchy is
 * enabled
 */
void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
{
        struct cgroup *task_cgrp;
        struct cgroup *mem_cgrp;
        /*
         * Need a buffer in BSS, can't rely on allocations. The code relies
         * on the assumption that OOM is serialized for memory controller.
         * If this assumption is broken, revisit this code.
         */
        static char memcg_name[PATH_MAX];
        int ret;

        if (!memcg || !p)
                return;


        rcu_read_lock();

        mem_cgrp = memcg->css.cgroup;
        task_cgrp = task_cgroup(p, mem_cgroup_subsys_id);

        ret = cgroup_path(task_cgrp, memcg_name, PATH_MAX);
        if (ret < 0) {
                /*
                 * Unfortunately, we are unable to convert to a useful name
                 * But we'll still print out the usage information
                 */
                rcu_read_unlock();
                goto done;
        }
        rcu_read_unlock();

        printk(KERN_INFO "Task in %s killed", memcg_name);

        rcu_read_lock();
        ret = cgroup_path(mem_cgrp, memcg_name, PATH_MAX);
        if (ret < 0) {
                rcu_read_unlock();
                goto done;
        }
        rcu_read_unlock();

        /*
         * Continues from above, so we don't need an KERN_ level
         */
        printk(KERN_CONT " as a result of limit of %s\n", memcg_name);
done:

        printk(KERN_INFO "memory: usage %llukB, limit %llukB, failcnt %llu\n",
                res_counter_read_u64(&memcg->res, RES_USAGE) >> 10,
                res_counter_read_u64(&memcg->res, RES_LIMIT) >> 10,
                res_counter_read_u64(&memcg->res, RES_FAILCNT));
        printk(KERN_INFO "memory+swap: usage %llukB, limit %llukB, "
                "failcnt %llu\n",
                res_counter_read_u64(&memcg->memsw, RES_USAGE) >> 10,
                res_counter_read_u64(&memcg->memsw, RES_LIMIT) >> 10,
                res_counter_read_u64(&memcg->memsw, RES_FAILCNT));
}

/*
 * This function returns the number of memcg under hierarchy tree. Returns
 * 1(self count) if no children.
 */
static int mem_cgroup_count_children(struct mem_cgroup *memcg)
{
        int num = 0;
        struct mem_cgroup *iter;

        for_each_mem_cgroup_tree(iter, memcg)
                num++;
        return num;
}

/*
 * Return the memory (and swap, if configured) limit for a memcg.
 */
u64 mem_cgroup_get_limit(struct mem_cgroup *memcg)
{
        u64 limit;

        limit = res_counter_read_u64(&memcg->res, RES_LIMIT);

        /*
         * Do not consider swap space if we cannot swap due to swappiness
         */
        if (mem_cgroup_swappiness(memcg)) {
                u64 memsw;

                limit += total_swap_pages << PAGE_SHIFT;
                memsw = res_counter_read_u64(&memcg->memsw, RES_LIMIT);

                /*
                 * If memsw is finite and limits the amount of swap space
                 * available to this memcg, return that limit.
                 */
                limit = min(limit, memsw);
        }

        return limit;
}

/*
 * Visit the first child (need not be the first child as per the ordering
 * of the cgroup list, since we track last_scanned_child) of @mem and use
 * that to reclaim free pages from.
 */
static struct mem_cgroup *
mem_cgroup_select_victim(struct mem_cgroup *root_memcg)
{
        struct mem_cgroup *ret = NULL;
        struct cgroup_subsys_state *css;
        int nextid, found;

        if (!root_memcg->use_hierarchy) {
                css_get(&root_memcg->css);
                ret = root_memcg;
        }

        while (!ret) {
                rcu_read_lock();
                nextid = root_memcg->last_scanned_child + 1;
                css = css_get_next(&mem_cgroup_subsys, nextid, &root_memcg->css,
                                   &found);
                if (css && css_tryget(css))
                        ret = container_of(css, struct mem_cgroup, css);

                rcu_read_unlock();
                /* Updates scanning parameter */
                if (!css) {
                        /* this means start scan from ID:1 */
                        root_memcg->last_scanned_child = 0;
                } else
                        root_memcg->last_scanned_child = found;
        }

        return ret;
}

/**
 * test_mem_cgroup_node_reclaimable
 * @mem: the target memcg
 * @nid: the node ID to be checked.
 * @noswap : specify true here if the user wants flle only information.
 *
 * This function returns whether the specified memcg contains any
 * reclaimable pages on a node. Returns true if there are any reclaimable
 * pages in the node.
 */
static bool test_mem_cgroup_node_reclaimable(struct mem_cgroup *memcg,
                int nid, bool noswap)
{
        if (mem_cgroup_node_nr_lru_pages(memcg, nid, LRU_ALL_FILE))
                return true;
        if (noswap || !total_swap_pages)
                return false;
        if (mem_cgroup_node_nr_lru_pages(memcg, nid, LRU_ALL_ANON))
                return true;
        return false;

}
#if MAX_NUMNODES > 1

/*
 * Always updating the nodemask is not very good - even if we have an empty
 * list or the wrong list here, we can start from some node and traverse all
 * nodes based on the zonelist. So update the list loosely once per 10 secs.
 *
 */
static void mem_cgroup_may_update_nodemask(struct mem_cgroup *memcg)
{
        int nid;
        /*
         * numainfo_events > 0 means there was at least NUMAINFO_EVENTS_TARGET
         * pagein/pageout changes since the last update.
         */
        if (!atomic_read(&memcg->numainfo_events))
                return;
        if (atomic_inc_return(&memcg->numainfo_updating) > 1)
                return;

        /* make a nodemask where this memcg uses memory from */
        memcg->scan_nodes = node_states[N_HIGH_MEMORY];

        for_each_node_mask(nid, node_states[N_HIGH_MEMORY]) {

                if (!test_mem_cgroup_node_reclaimable(memcg, nid, false))
                        node_clear(nid, memcg->scan_nodes);
        }

        atomic_set(&memcg->numainfo_events, 0);
        atomic_set(&memcg->numainfo_updating, 0);
}

/*
 * Selecting a node where we start reclaim from. Because what we need is just
 * reducing usage counter, start from anywhere is O,K. Considering
 * memory reclaim from current node, there are pros. and cons.
 *
 * Freeing memory from current node means freeing memory from a node which
 * we'll use or we've used. So, it may make LRU bad. And if several threads
 * hit limits, it will see a contention on a node. But freeing from remote
 * node means more costs for memory reclaim because of memory latency.
 *
 * Now, we use round-robin. Better algorithm is welcomed.
 */
int mem_cgroup_select_victim_node(struct mem_cgroup *memcg)
{
        int node;

        mem_cgroup_may_update_nodemask(memcg);
        node = memcg->last_scanned_node;

        node = next_node(node, memcg->scan_nodes);
        if (node == MAX_NUMNODES)
                node = first_node(memcg->scan_nodes);
        /*
         * We call this when we hit limit, not when pages are added to LRU.
         * No LRU may hold pages because all pages are UNEVICTABLE or
         * memcg is too small and all pages are not on LRU. In that case,
         * we use curret node.
         */
        if (unlikely(node == MAX_NUMNODES))
                node = numa_node_id();

        memcg->last_scanned_node = node;
        return node;
}

/*
 * Check all nodes whether it contains reclaimable pages or not.
 * For quick scan, we make use of scan_nodes. This will allow us to skip
 * unused nodes. But scan_nodes is lazily updated and may not cotain
 * enough new information. We need to do double check.
 */
bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
{
        int nid;

        /*
         * quick check...making use of scan_node.
         * We can skip unused nodes.
         */
        if (!nodes_empty(memcg->scan_nodes)) {
                for (nid = first_node(memcg->scan_nodes);
                     nid < MAX_NUMNODES;
                     nid = next_node(nid, memcg->scan_nodes)) {

                        if (test_mem_cgroup_node_reclaimable(memcg, nid, noswap))
                                return true;
                }
        }
        /*
         * Check rest of nodes.
         */
        for_each_node_state(nid, N_HIGH_MEMORY) {
                if (node_isset(nid, memcg->scan_nodes))
                        continue;
                if (test_mem_cgroup_node_reclaimable(memcg, nid, noswap))
                        return true;
        }
        return false;
}

#else
int mem_cgroup_select_victim_node(struct mem_cgroup *memcg)
{
        return 0;
}

bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
{
        return test_mem_cgroup_node_reclaimable(memcg, 0, noswap);
}
#endif

/*
 * Scan the hierarchy if needed to reclaim memory. We remember the last child
 * we reclaimed from, so that we don't end up penalizing one child extensively
 * based on its position in the children list.
 *
 * root_memcg is the original ancestor that we've been reclaim from.
 *
 * We give up and return to the caller when we visit root_memcg twice.
 * (other groups can be removed while we're walking....)
 *
 * If shrink==true, for avoiding to free too much, this returns immedieately.
 */
static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_memcg,
                                                struct zone *zone,
                                                gfp_t gfp_mask,
                                                unsigned long reclaim_options,
                                                unsigned long *total_scanned)
{
        struct mem_cgroup *victim;
        int ret, total = 0;
        int loop = 0;
        bool noswap = reclaim_options & MEM_CGROUP_RECLAIM_NOSWAP;
        bool shrink = reclaim_options & MEM_CGROUP_RECLAIM_SHRINK;
        bool check_soft = reclaim_options & MEM_CGROUP_RECLAIM_SOFT;
        unsigned long excess;
        unsigned long nr_scanned;

        excess = res_counter_soft_limit_excess(&root_memcg->res) >> PAGE_SHIFT;

        /* If memsw_is_minimum==1, swap-out is of-no-use. */
        if (!check_soft && !shrink && root_memcg->memsw_is_minimum)
                noswap = true;

        while (1) {
                victim = mem_cgroup_select_victim(root_memcg);
                if (victim == root_memcg) {
                        loop++;
                        /*
                         * We are not draining per cpu cached charges during
                         * soft limit reclaim  because global reclaim doesn't
                         * care about charges. It tries to free some memory and
                         * charges will not give any.
                         */
                        if (!check_soft && loop >= 1)
                                drain_all_stock_async(root_memcg);
                        if (loop >= 2) {
                                /*
                                 * If we have not been able to reclaim
                                 * anything, it might because there are
                                 * no reclaimable pages under this hierarchy
                                 */
                                if (!check_soft || !total) {
                                        css_put(&victim->css);
                                        break;
                                }
                                /*
                                 * We want to do more targeted reclaim.
                                 * excess >> 2 is not to excessive so as to
                                 * reclaim too much, nor too less that we keep
                                 * coming back to reclaim from this cgroup
                                 */
                                if (total >= (excess >> 2) ||
                                        (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) {
                                        css_put(&victim->css);
                                        break;
                                }
                        }
                }
                if (!mem_cgroup_reclaimable(victim, noswap)) {
                        /* this cgroup's local usage == 0 */
                        css_put(&victim->css);
                        continue;
                }
                /* we use swappiness of local cgroup */
                if (check_soft) {
                        ret = mem_cgroup_shrink_node_zone(victim, gfp_mask,
                                noswap, zone, &nr_scanned);
                        *total_scanned += nr_scanned;
                } else
                        ret = try_to_free_mem_cgroup_pages(victim, gfp_mask,
                                                noswap);
                css_put(&victim->css);
                /*
                 * At shrinking usage, we can't check we should stop here or
                 * reclaim more. It's depends on callers. last_scanned_child
                 * will work enough for keeping fairness under tree.
                 */
                if (shrink)
                        return ret;
                total += ret;
                if (check_soft) {
                        if (!res_counter_soft_limit_excess(&root_memcg->res))
                                return total;
                } else if (mem_cgroup_margin(root_memcg))
                        return total;
        }
        return total;
}

/*
 * Check OOM-Killer is already running under our hierarchy.
 * If someone is running, return false.
 * Has to be called with memcg_oom_lock
 */
static bool mem_cgroup_oom_lock(struct mem_cgroup *memcg)
{
        struct mem_cgroup *iter, *failed = NULL;
        bool cond = true;

        for_each_mem_cgroup_tree_cond(iter, memcg, cond) {
                if (iter->oom_lock) {
                        /*
                         * this subtree of our hierarchy is already locked
                         * so we cannot give a lock.
                         */
                        failed = iter;
                        cond = false;
                } else
                        iter->oom_lock = true;
        }

        if (!failed)
                return true;

        /*
         * OK, we failed to lock the whole subtree so we have to clean up
         * what we set up to the failing subtree
         */
        cond = true;
        for_each_mem_cgroup_tree_cond(iter, memcg, cond) {
                if (iter == failed) {
                        cond = false;
                        continue;
                }
                iter->oom_lock = false;
        }
        return false;
}

/*
 * Has to be called with memcg_oom_lock
 */
static int mem_cgroup_oom_unlock(struct mem_cgroup *memcg)
{
        struct mem_cgroup *iter;

        for_each_mem_cgroup_tree(iter, memcg)
                iter->oom_lock = false;
        return 0;
}

static void mem_cgroup_mark_under_oom(struct mem_cgroup *memcg)
{
        struct mem_cgroup *iter;

        for_each_mem_cgroup_tree(iter, memcg)
                atomic_inc(&iter->under_oom);
}

static void mem_cgroup_unmark_under_oom(struct mem_cgroup *memcg)
{
        struct mem_cgroup *iter;

        /*
         * When a new child is created while the hierarchy is under oom,
         * mem_cgroup_oom_lock() may not be called. We have to use
         * atomic_add_unless() here.
         */
        for_each_mem_cgroup_tree(iter, memcg)
                atomic_add_unless(&iter->under_oom, -1, 0);
}

static DEFINE_SPINLOCK(memcg_oom_lock);
static DECLARE_WAIT_QUEUE_HEAD(memcg_oom_waitq);

struct oom_wait_info {
        struct mem_cgroup *mem;
        wait_queue_t    wait;
};

static int memcg_oom_wake_function(wait_queue_t *wait,
        unsigned mode, int sync, void *arg)
{
        struct mem_cgroup *wake_memcg = (struct mem_cgroup *)arg,
                          *oom_wait_memcg;
        struct oom_wait_info *oom_wait_info;

        oom_wait_info = container_of(wait, struct oom_wait_info, wait);
        oom_wait_memcg = oom_wait_info->mem;

        /*
         * Both of oom_wait_info->mem and wake_mem are stable under us.
         * Then we can use css_is_ancestor without taking care of RCU.
         */
        if (!mem_cgroup_same_or_subtree(oom_wait_memcg, wake_memcg)
                && !mem_cgroup_same_or_subtree(wake_memcg, oom_wait_memcg))
                return 0;
        return autoremove_wake_function(wait, mode, sync, arg);
}

static void memcg_wakeup_oom(struct mem_cgroup *memcg)
{
        /* for filtering, pass "memcg" as argument. */
        __wake_up(&memcg_oom_waitq, TASK_NORMAL, 0, memcg);
}

static void memcg_oom_recover(struct mem_cgroup *memcg)
{
        if (memcg && atomic_read(&memcg->under_oom))
                memcg_wakeup_oom(memcg);
}

/*
 * try to call OOM killer. returns false if we should exit memory-reclaim loop.
 */
bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask)
{
        struct oom_wait_info owait;
        bool locked, need_to_kill;

        owait.mem = memcg;
        owait.wait.flags = 0;
        owait.wait.func = memcg_oom_wake_function;
        owait.wait.private = current;
        INIT_LIST_HEAD(&owait.wait.task_list);
        need_to_kill = true;
        mem_cgroup_mark_under_oom(memcg);

        /* At first, try to OOM lock hierarchy under memcg.*/
        spin_lock(&memcg_oom_lock);
        locked = mem_cgroup_oom_lock(memcg);
        /*
         * Even if signal_pending(), we can't quit charge() loop without
         * accounting. So, UNINTERRUPTIBLE is appropriate. But SIGKILL
         * under OOM is always welcomed, use TASK_KILLABLE here.
         */
        prepare_to_wait(&memcg_oom_waitq, &owait.wait, TASK_KILLABLE);
        if (!locked || memcg->oom_kill_disable)
                need_to_kill = false;
        if (locked)
                mem_cgroup_oom_notify(memcg);
        spin_unlock(&memcg_oom_lock);

        if (need_to_kill) {
                finish_wait(&memcg_oom_waitq, &owait.wait);
                mem_cgroup_out_of_memory(memcg, mask);
        } else {
                schedule();
                finish_wait(&memcg_oom_waitq, &owait.wait);
        }
        spin_lock(&memcg_oom_lock);
        if (locked)
                mem_cgroup_oom_unlock(memcg);
        memcg_wakeup_oom(memcg);
        spin_unlock(&memcg_oom_lock);

        mem_cgroup_unmark_under_oom(memcg);

        if (test_thread_flag(TIF_MEMDIE) || fatal_signal_pending(current))
                return false;
        /* Give chance to dying process */
        schedule_timeout_uninterruptible(1);
        return true;
}

/*
 * Currently used to update mapped file statistics, but the routine can be
 * generalized to update other statistics as well.
 *
 * Notes: Race condition
 *
 * We usually use page_cgroup_lock() for accessing page_cgroup member but
 * it tends to be costly. But considering some conditions, we doesn't need
 * to do so _always_.
 *
 * Considering "charge", lock_page_cgroup() is not required because all
 * file-stat operations happen after a page is attached to radix-tree. There
 * are no race with "charge".
 *
 * Considering "uncharge", we know that memcg doesn't clear pc->mem_cgroup
 * at "uncharge" intentionally. So, we always see valid pc->mem_cgroup even
 * if there are race with "uncharge". Statistics itself is properly handled
 * by flags.
 *
 * Considering "move", this is an only case we see a race. To make the race
 * small, we check MEM_CGROUP_ON_MOVE percpu value and detect there are
 * possibility of race condition. If there is, we take a lock.
 */

void mem_cgroup_update_page_stat(struct page *page,
                                 enum mem_cgroup_page_stat_item idx, int val)
{
        struct mem_cgroup *memcg;
        struct page_cgroup *pc = lookup_page_cgroup(page);
        bool need_unlock = false;
        unsigned long uninitialized_var(flags);

        if (unlikely(!pc))
                return;

        rcu_read_lock();
        memcg = pc->mem_cgroup;
        if (unlikely(!memcg || !PageCgroupUsed(pc)))
                goto out;
        /* pc->mem_cgroup is unstable ? */
        if (unlikely(mem_cgroup_stealed(memcg)) || PageTransHuge(page)) {
                /* take a lock against to access pc->mem_cgroup */
                move_lock_page_cgroup(pc, &flags);
                need_unlock = true;
                memcg = pc->mem_cgroup;
                if (!memcg || !PageCgroupUsed(pc))
                        goto out;
        }

        switch (idx) {
        case MEMCG_NR_FILE_MAPPED:
                if (val > 0)
                        SetPageCgroupFileMapped(pc);
                else if (!page_mapped(page))
                        ClearPageCgroupFileMapped(pc);
                idx = MEM_CGROUP_STAT_FILE_MAPPED;
                break;
        default:
                BUG();
        }

        this_cpu_add(memcg->stat->count[idx], val);

out:
        if (unlikely(need_unlock))
                move_unlock_page_cgroup(pc, &flags);
        rcu_read_unlock();
        return;
}
EXPORT_SYMBOL(mem_cgroup_update_page_stat);

/*
 * size of first charge trial. "32" comes from vmscan.c's magic value.
 * TODO: maybe necessary to use big numbers in big irons.
 */
#define CHARGE_BATCH    32U
struct memcg_stock_pcp {
        struct mem_cgroup *cached; /* this never be root cgroup */
        unsigned int nr_pages;
        struct work_struct work;
        unsigned long flags;
#define FLUSHING_CACHED_CHARGE  (0)
};
static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock);
static DEFINE_MUTEX(percpu_charge_mutex);

/*
 * Try to consume stocked charge on this cpu. If success, one page is consumed
 * from local stock and true is returned. If the stock is 0 or charges from a
 * cgroup which is not current target, returns false. This stock will be
 * refilled.
 */
static bool consume_stock(struct mem_cgroup *memcg)
{
        struct memcg_stock_pcp *stock;
        bool ret = true;

        stock = &get_cpu_var(memcg_stock);
        if (memcg == stock->cached && stock->nr_pages)
                stock->nr_pages--;
        else /* need to call res_counter_charge */
                ret = false;
        put_cpu_var(memcg_stock);
        return ret;
}

/*
 * Returns stocks cached in percpu to res_counter and reset cached information.
 */
static void drain_stock(struct memcg_stock_pcp *stock)
{
        struct mem_cgroup *old = stock->cached;

        if (stock->nr_pages) {
                unsigned long bytes = stock->nr_pages * PAGE_SIZE;

                res_counter_uncharge(&old->res, bytes);
                if (do_swap_account)
                        res_counter_uncharge(&old->memsw, bytes);
                stock->nr_pages = 0;
        }
        stock->cached = NULL;
}

/*
 * This must be called under preempt disabled or must be called by
 * a thread which is pinned to local cpu.
 */
static void drain_local_stock(struct work_struct *dummy)
{
        struct memcg_stock_pcp *stock = &__get_cpu_var(memcg_stock);
        drain_stock(stock);
        clear_bit(FLUSHING_CACHED_CHARGE, &stock->flags);
}

/*
 * Cache charges(val) which is from res_counter, to local per_cpu area.
 * This will be consumed by consume_stock() function, later.
 */
static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
{
        struct memcg_stock_pcp *stock = &get_cpu_var(memcg_stock);

        if (stock->cached != memcg) { /* reset if necessary */
                drain_stock(stock);
                stock->cached = memcg;
        }
        stock->nr_pages += nr_pages;
        put_cpu_var(memcg_stock);
}

/*
 * Drains all per-CPU charge caches for given root_memcg resp. subtree
 * of the hierarchy under it. sync flag says whether we should block
 * until the work is done.
 */
static void drain_all_stock(struct mem_cgroup *root_memcg, bool sync)
{
        int cpu, curcpu;

        /* Notify other cpus that system-wide "drain" is running */
        get_online_cpus();
        curcpu = get_cpu();
        for_each_online_cpu(cpu) {
                struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
                struct mem_cgroup *memcg;

                memcg = stock->cached;
                if (!memcg || !stock->nr_pages)
                        continue;
                if (!mem_cgroup_same_or_subtree(root_memcg, memcg))
                        continue;
                if (!test_and_set_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) {
                        if (cpu == curcpu)
                                drain_local_stock(&stock->work);
                        else
                                schedule_work_on(cpu, &stock->work);
                }
        }
        put_cpu();

        if (!sync)
                goto out;

        for_each_online_cpu(cpu) {
                struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
                if (test_bit(FLUSHING_CACHED_CHARGE, &stock->flags))
                        flush_work(&stock->work);
        }
out:
        put_online_cpus();
}

/*
 * Tries to drain stocked charges in other cpus. This function is asynchronous
 * and just put a work per cpu for draining localy on each cpu. Caller can
 * expects some charges will be back to res_counter later but cannot wait for
 * it.
 */
static void drain_all_stock_async(struct mem_cgroup *root_memcg)
{
        /*
         * If someone calls draining, avoid adding more kworker runs.
         */
        if (!mutex_trylock(&percpu_charge_mutex))
                return;
        drain_all_stock(root_memcg, false);
        mutex_unlock(&percpu_charge_mutex);
}

/* This is a synchronous drain interface. */
static void drain_all_stock_sync(struct mem_cgroup *root_memcg)
{
        /* called when force_empty is called */
        mutex_lock(&percpu_charge_mutex);
        drain_all_stock(root_memcg, true);
        mutex_unlock(&percpu_charge_mutex);
}

/*
 * This function drains percpu counter value from DEAD cpu and
 * move it to local cpu. Note that this function can be preempted.
 */
static void mem_cgroup_drain_pcp_counter(struct mem_cgroup *memcg, int cpu)
{
        int i;

        spin_lock(&memcg->pcp_counter_lock);
        for (i = 0; i < MEM_CGROUP_STAT_DATA; i++) {
                long x = per_cpu(memcg->stat->count[i], cpu);

                per_cpu(memcg->stat->count[i], cpu) = 0;
                memcg->nocpu_base.count[i] += x;
        }
        for (i = 0; i < MEM_CGROUP_EVENTS_NSTATS; i++) {
                unsigned long x = per_cpu(memcg->stat->events[i], cpu);

                per_cpu(memcg->stat->events[i], cpu) = 0;
                memcg->nocpu_base.events[i] += x;
        }
        /* need to clear ON_MOVE value, works as a kind of lock. */
        per_cpu(memcg->stat->count[MEM_CGROUP_ON_MOVE], cpu) = 0;
        spin_unlock(&memcg->pcp_counter_lock);
}

static void synchronize_mem_cgroup_on_move(struct mem_cgroup *memcg, int cpu)
{
        int idx = MEM_CGROUP_ON_MOVE;

        spin_lock(&memcg->pcp_counter_lock);
        per_cpu(memcg->stat->count[idx], cpu) = memcg->nocpu_base.count[idx];
        spin_unlock(&memcg->pcp_counter_lock);
}

static int __cpuinit memcg_cpu_hotplug_callback(struct notifier_block *nb,
                                        unsigned long action,
                                        void *hcpu)
{
        int cpu = (unsigned long)hcpu;
        struct memcg_stock_pcp *stock;
        struct mem_cgroup *iter;

        if ((action == CPU_ONLINE)) {
                for_each_mem_cgroup_all(iter)
                        synchronize_mem_cgroup_on_move(iter, cpu);
                return NOTIFY_OK;
        }

        if ((action != CPU_DEAD) || action != CPU_DEAD_FROZEN)
                return NOTIFY_OK;

        for_each_mem_cgroup_all(iter)
                mem_cgroup_drain_pcp_counter(iter, cpu);

        stock = &per_cpu(memcg_stock, cpu);
        drain_stock(stock);
        return NOTIFY_OK;
}


/* See __mem_cgroup_try_charge() for details */
enum {
        CHARGE_OK,              /* success */
        CHARGE_RETRY,           /* need to retry but retry is not bad */
        CHARGE_NOMEM,           /* we can't do more. return -ENOMEM */
        CHARGE_WOULDBLOCK,      /* GFP_WAIT wasn't set and no enough res. */
        CHARGE_OOM_DIE,         /* the current is killed because of OOM */
};

static int mem_cgroup_do_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
                                unsigned int nr_pages, bool oom_check)
{
        unsigned long csize = nr_pages * PAGE_SIZE;
        struct mem_cgroup *mem_over_limit;
        struct res_counter *fail_res;
        unsigned long flags = 0;
        int ret;

        ret = res_counter_charge(&memcg->res, csize, &fail_res);

        if (likely(!ret)) {
                if (!do_swap_account)
                        return CHARGE_OK;
                ret = res_counter_charge(&memcg->memsw, csize, &fail_res);
                if (likely(!ret))
                        return CHARGE_OK;

                res_counter_uncharge(&memcg->res, csize);
                mem_over_limit = mem_cgroup_from_res_counter(fail_res, memsw);
                flags |= MEM_CGROUP_RECLAIM_NOSWAP;
        } else
                mem_over_limit = mem_cgroup_from_res_counter(fail_res, res);
        /*
         * nr_pages can be either a huge page (HPAGE_PMD_NR), a batch
         * of regular pages (CHARGE_BATCH), or a single regular page (1).
         *
         * Never reclaim on behalf of optional batching, retry with a
         * single page instead.
         */
        if (nr_pages == CHARGE_BATCH)
                return CHARGE_RETRY;

        if (!(gfp_mask & __GFP_WAIT))
                return CHARGE_WOULDBLOCK;

        ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, NULL,
                                              gfp_mask, flags, NULL);
        if (mem_cgroup_margin(mem_over_limit) >= nr_pages)
                return CHARGE_RETRY;
        /*
         * Even though the limit is exceeded at this point, reclaim
         * may have been able to free some pages.  Retry the charge
         * before killing the task.
         *
         * Only for regular pages, though: huge pages are rather
         * unlikely to succeed so close to the limit, and we fall back
         * to regular pages anyway in case of failure.
         */
        if (nr_pages == 1 && ret)
                return CHARGE_RETRY;

        /*
         * At task move, charge accounts can be doubly counted. So, it's
         * better to wait until the end of task_move if something is going on.
         */
        if (mem_cgroup_wait_acct_move(mem_over_limit))
                return CHARGE_RETRY;

        /* If we don't need to call oom-killer at el, return immediately */
        if (!oom_check)
                return CHARGE_NOMEM;
        /* check OOM */
        if (!mem_cgroup_handle_oom(mem_over_limit, gfp_mask))
                return CHARGE_OOM_DIE;

        return CHARGE_RETRY;
}

/*
 * Unlike exported interface, "oom" parameter is added. if oom==true,
 * oom-killer can be invoked.
 */
static int __mem_cgroup_try_charge(struct mm_struct *mm,
                                   gfp_t gfp_mask,
                                   unsigned int nr_pages,
                                   struct mem_cgroup **ptr,
                                   bool oom)
{
        unsigned int batch = max(CHARGE_BATCH, nr_pages);
        int nr_oom_retries = MEM_CGROUP_RECLAIM_RETRIES;
        struct mem_cgroup *memcg = NULL;
        int ret;

        /*
         * Unlike gloval-vm's OOM-kill, we're not in memory shortage
         * in system level. So, allow to go ahead dying process in addition to
         * MEMDIE process.
         */
        if (unlikely(test_thread_flag(TIF_MEMDIE)
                     || fatal_signal_pending(current)))
                goto bypass;

        /*
         * We always charge the cgroup the mm_struct belongs to.
         * The mm_struct's mem_cgroup changes on task migration if the
         * thread group leader migrates. It's possible that mm is not
         * set, if so charge the init_mm (happens for pagecache usage).
         */
        if (!*ptr && !mm)
                goto bypass;
again:
        if (*ptr) { /* css should be a valid one */
                memcg = *ptr;
                VM_BUG_ON(css_is_removed(&memcg->css));
                if (mem_cgroup_is_root(memcg))
                        goto done;
                if (nr_pages == 1 && consume_stock(memcg))
                        goto done;
                css_get(&memcg->css);
        } else {
                struct task_struct *p;

                rcu_read_lock();
                p = rcu_dereference(mm->owner);
                /*
                 * Because we don't have task_lock(), "p" can exit.
                 * In that case, "memcg" can point to root or p can be NULL with
                 * race with swapoff. Then, we have small risk of mis-accouning.
                 * But such kind of mis-account by race always happens because
                 * we don't have cgroup_mutex(). It's overkill and we allo that
                 * small race, here.
                 * (*) swapoff at el will charge against mm-struct not against
                 * task-struct. So, mm->owner can be NULL.
                 */
                memcg = mem_cgroup_from_task(p);
                if (!memcg || mem_cgroup_is_root(memcg)) {
                        rcu_read_unlock();
                        goto done;
                }
                if (nr_pages == 1 && consume_stock(memcg)) {
                        /*
                         * It seems dagerous to access memcg without css_get().
                         * But considering how consume_stok works, it's not
                         * necessary. If consume_stock success, some charges
                         * from this memcg are cached on this cpu. So, we
                         * don't need to call css_get()/css_tryget() before
                         * calling consume_stock().
                         */
                        rcu_read_unlock();
                        goto done;
                }
                /* after here, we may be blocked. we need to get refcnt */
                if (!css_tryget(&memcg->css)) {
                        rcu_read_unlock();
                        goto again;
                }
                rcu_read_unlock();
        }

        do {
                bool oom_check;

                /* If killed, bypass charge */
                if (fatal_signal_pending(current)) {
                        css_put(&memcg->css);
                        goto bypass;
                }

                oom_check = false;
                if (oom && !nr_oom_retries) {
                        oom_check = true;
                        nr_oom_retries = MEM_CGROUP_RECLAIM_RETRIES;
                }

                ret = mem_cgroup_do_charge(memcg, gfp_mask, batch, oom_check);
                switch (ret) {
                case CHARGE_OK:
                        break;
                case CHARGE_RETRY: /* not in OOM situation but retry */
                        batch = nr_pages;
                        css_put(&memcg->css);
                        memcg = NULL;
                        goto again;
                case CHARGE_WOULDBLOCK: /* !__GFP_WAIT */
                        css_put(&memcg->css);
                        goto nomem;
                case CHARGE_NOMEM: /* OOM routine works */
                        if (!oom) {
                                css_put(&memcg->css);
                                goto nomem;
                        }
                        /* If oom, we never return -ENOMEM */
                        nr_oom_retries--;
                        break;
                case CHARGE_OOM_DIE: /* Killed by OOM Killer */
                        css_put(&memcg->css);
                        goto bypass;
                }
        } while (ret != CHARGE_OK);

        if (batch > nr_pages)
                refill_stock(memcg, batch - nr_pages);
        css_put(&memcg->css);
done:
        *ptr = memcg;
        return 0;
nomem:
        *ptr = NULL;
        return -ENOMEM;
bypass:
        *ptr = NULL;
        return 0;
}

/*
 * Somemtimes we have to undo a charge we got by try_charge().
 * This function is for that and do uncharge, put css's refcnt.
 * gotten by try_charge().
 */
static void __mem_cgroup_cancel_charge(struct mem_cgroup *memcg,
                                       unsigned int nr_pages)
{
        if (!mem_cgroup_is_root(memcg)) {
                unsigned long bytes = nr_pages * PAGE_SIZE;

                res_counter_uncharge(&memcg->res, bytes);
                if (do_swap_account)
                        res_counter_uncharge(&memcg->memsw, bytes);
        }
}

/*
 * A helper function to get mem_cgroup from ID. must be called under
 * rcu_read_lock(). The caller must check css_is_removed() or some if
 * it's concern. (dropping refcnt from swap can be called against removed
 * memcg.)
 */
static struct mem_cgroup *mem_cgroup_lookup(unsigned short id)
{
        struct cgroup_subsys_state *css;

        /* ID 0 is unused ID */
        if (!id)
                return NULL;
        css = css_lookup(&mem_cgroup_subsys, id);
        if (!css)
                return NULL;
        return container_of(css, struct mem_cgroup, css);
}

struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
{
        struct mem_cgroup *memcg = NULL;
        struct page_cgroup *pc;
        unsigned short id;
        swp_entry_t ent;

        VM_BUG_ON(!PageLocked(page));

        pc = lookup_page_cgroup(page);
        lock_page_cgroup(pc);
        if (PageCgroupUsed(pc)) {
                memcg = pc->mem_cgroup;
                if (memcg && !css_tryget(&memcg->css))
                        memcg = NULL;
        } else if (PageSwapCache(page)) {
                ent.val = page_private(page);
                id = lookup_swap_cgroup(ent);
                rcu_read_lock();
                memcg = mem_cgroup_lookup(id);
                if (memcg && !css_tryget(&memcg->css))
                        memcg = NULL;
                rcu_read_unlock();
        }
        unlock_page_cgroup(pc);
        return memcg;
}

static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
                                       struct page *page,
                                       unsigned int nr_pages,
                                       struct page_cgroup *pc,
                                       enum charge_type ctype)
{
        lock_page_cgroup(pc);
        if (unlikely(PageCgroupUsed(pc))) {
                unlock_page_cgroup(pc);
                __mem_cgroup_cancel_charge(memcg, nr_pages);
                return;
        }
        /*
         * we don't need page_cgroup_lock about tail pages, becase they are not
         * accessed by any other context at this point.
         */
        pc->mem_cgroup = memcg;
        /*
         * We access a page_cgroup asynchronously without lock_page_cgroup().
         * Especially when a page_cgroup is taken from a page, pc->mem_cgroup
         * is accessed after testing USED bit. To make pc->mem_cgroup visible
         * before USED bit, we need memory barrier here.
         * See mem_cgroup_add_lru_list(), etc.
         */
        smp_wmb();
        switch (ctype) {
        case MEM_CGROUP_CHARGE_TYPE_CACHE:
        case MEM_CGROUP_CHARGE_TYPE_SHMEM:
                SetPageCgroupCache(pc);
                SetPageCgroupUsed(pc);
                break;
        case MEM_CGROUP_CHARGE_TYPE_MAPPED:
                ClearPageCgroupCache(pc);
                SetPageCgroupUsed(pc);
                break;
        default:
                break;
        }

        mem_cgroup_charge_statistics(memcg, PageCgroupCache(pc), nr_pages);
        unlock_page_cgroup(pc);
        /*
         * "charge_statistics" updated event counter. Then, check it.
         * Insert ancestor (and ancestor's ancestors), to softlimit RB-tree.
         * if they exceeds softlimit.
         */
        memcg_check_events(memcg, page);
}

#ifdef CONFIG_TRANSPARENT_HUGEPAGE

#define PCGF_NOCOPY_AT_SPLIT ((1 << PCG_LOCK) | (1 << PCG_MOVE_LOCK) |\
                        (1 << PCG_ACCT_LRU) | (1 << PCG_MIGRATION))
/*
 * Because tail pages are not marked as "used", set it. We're under
 * zone->lru_lock, 'splitting on pmd' and compund_lock.
 */
void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail)
{
        struct page_cgroup *head_pc = lookup_page_cgroup(head);
        struct page_cgroup *tail_pc = lookup_page_cgroup(tail);
        unsigned long flags;

        if (mem_cgroup_disabled())
                return;
        /*
         * We have no races with charge/uncharge but will have races with
         * page state accounting.
         */
        move_lock_page_cgroup(head_pc, &flags);

        tail_pc->mem_cgroup = head_pc->mem_cgroup;
        smp_wmb(); /* see __commit_charge() */
        if (PageCgroupAcctLRU(head_pc)) {
                enum lru_list lru;
                struct mem_cgroup_per_zone *mz;

                /*
                 * LRU flags cannot be copied because we need to add tail
                 *.page to LRU by generic call and our hook will be called.
                 * We hold lru_lock, then, reduce counter directly.
                 */
                lru = page_lru(head);
                mz = page_cgroup_zoneinfo(head_pc->mem_cgroup, head);
                MEM_CGROUP_ZSTAT(mz, lru) -= 1;
        }
        tail_pc->flags = head_pc->flags & ~PCGF_NOCOPY_AT_SPLIT;
        move_unlock_page_cgroup(head_pc, &flags);
}
#endif

/**
 * mem_cgroup_move_account - move account of the page
 * @page: the page
 * @nr_pages: number of regular pages (>1 for huge pages)
 * @pc: page_cgroup of the page.
 * @from: mem_cgroup which the page is moved from.
 * @to: mem_cgroup which the page is moved to. @from != @to.
 * @uncharge: whether we should call uncharge and css_put against @from.
 *
 * The caller must confirm following.
 * - page is not on LRU (isolate_page() is useful.)
 * - compound_lock is held when nr_pages > 1
 *
 * This function doesn't do "charge" nor css_get to new cgroup. It should be
 * done by a caller(__mem_cgroup_try_charge would be useful). If @uncharge is
 * true, this function does "uncharge" from old cgroup, but it doesn't if
 * @uncharge is false, so a caller should do "uncharge".
 */
static int mem_cgroup_move_account(struct page *page,
                                   unsigned int nr_pages,
                                   struct page_cgroup *pc,
                                   struct mem_cgroup *from,
                                   struct mem_cgroup *to,
                                   bool uncharge)
{
        unsigned long flags;
        int ret;

        VM_BUG_ON(from == to);
        VM_BUG_ON(PageLRU(page));
        /*
         * The page is isolated from LRU. So, collapse function
         * will not handle this page. But page splitting can happen.
         * Do this check under compound_page_lock(). The caller should
         * hold it.
         */
        ret = -EBUSY;
        if (nr_pages > 1 && !PageTransHuge(page))
                goto out;

        lock_page_cgroup(pc);

        ret = -EINVAL;
        if (!PageCgroupUsed(pc) || pc->mem_cgroup != from)
                goto unlock;

        move_lock_page_cgroup(pc, &flags);

        if (PageCgroupFileMapped(pc)) {
                /* Update mapped_file data for mem_cgroup */
                preempt_disable();
                __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
                __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
                preempt_enable();
        }
        mem_cgroup_charge_statistics(from, PageCgroupCache(pc), -nr_pages);
        if (uncharge)
                /* This is not "cancel", but cancel_charge does all we need. */
                __mem_cgroup_cancel_charge(from, nr_pages);

        /* caller should have done css_get */
        pc->mem_cgroup = to;
        mem_cgroup_charge_statistics(to, PageCgroupCache(pc), nr_pages);
        /*
         * We charges against "to" which may not have any tasks. Then, "to"
         * can be under rmdir(). But in current implementation, caller of
         * this function is just force_empty() and move charge, so it's
         * guaranteed that "to" is never removed. So, we don't check rmdir
         * status here.
         */
        move_unlock_page_cgroup(pc, &flags);
        ret = 0;
unlock:
        unlock_page_cgroup(pc);
        /*
         * check events
         */
        memcg_check_events(to, page);
        memcg_check_events(from, page);
out:
        return ret;
}

/*
 * move charges to its parent.
 */

static int mem_cgroup_move_parent(struct page *page,
                                  struct page_cgroup *pc,
                                  struct mem_cgroup *child,
                                  gfp_t gfp_mask)
{
        struct cgroup *cg = child->css.cgroup;
        struct cgroup *pcg = cg->parent;
        struct mem_cgroup *parent;
        unsigned int nr_pages;
        unsigned long uninitialized_var(flags);
        int ret;

        /* Is ROOT ? */
        if (!pcg)
                return -EINVAL;

        ret = -EBUSY;
        if (!get_page_unless_zero(page))
                goto out;
        if (isolate_lru_page(page))
                goto put;

        nr_pages = hpage_nr_pages(page);

        parent = mem_cgroup_from_cont(pcg);
        ret = __mem_cgroup_try_charge(NULL, gfp_mask, nr_pages, &parent, false);
        if (ret || !parent)
                goto put_back;

        if (nr_pages > 1)
                flags = compound_lock_irqsave(page);

        ret = mem_cgroup_move_account(page, nr_pages, pc, child, parent, true);
        if (ret)
                __mem_cgroup_cancel_charge(parent, nr_pages);

        if (nr_pages > 1)
                compound_unlock_irqrestore(page, flags);
put_back:
        putback_lru_page(page);
put:
        put_page(page);
out:
        return ret;
}

/*
 * Charge the memory controller for page usage.
 * Return
 * 0 if the charge was successful
 * < 0 if the cgroup is over its limit
 */
static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
                                gfp_t gfp_mask, enum charge_type ctype)
{
        struct mem_cgroup *memcg = NULL;
        unsigned int nr_pages = 1;
        struct page_cgroup *pc;
        bool oom = true;
        int ret;

        if (PageTransHuge(page)) {
                nr_pages <<= compound_order(page);
                VM_BUG_ON(!PageTransHuge(page));
                /*
                 * Never OOM-kill a process for a huge page.  The
                 * fault handler will fall back to regular pages.
                 */
                oom = false;
        }

        pc = lookup_page_cgroup(page);
        BUG_ON(!pc); /* XXX: remove this and move pc lookup into commit */

        ret = __mem_cgroup_try_charge(mm, gfp_mask, nr_pages, &memcg, oom);
        if (ret || !memcg)
                return ret;

        __mem_cgroup_commit_charge(memcg, page, nr_pages, pc, ctype);
        return 0;
}

int mem_cgroup_newpage_charge(struct page *page,
                              struct mm_struct *mm, gfp_t gfp_mask)
{
        if (mem_cgroup_disabled())
                return 0;
        /*
         * If already mapped, we don't have to account.
         * If page cache, page->mapping has address_space.
         * But page->mapping may have out-of-use anon_vma pointer,
         * detecit it by PageAnon() check. newly-mapped-anon's page->mapping
         * is NULL.
         */
        if (page_mapped(page) || (page->mapping && !PageAnon(page)))
                return 0;
        if (unlikely(!mm))
                mm = &init_mm;
        return mem_cgroup_charge_common(page, mm, gfp_mask,
                                MEM_CGROUP_CHARGE_TYPE_MAPPED);
}

static void
__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
                                        enum charge_type ctype);

static void
__mem_cgroup_commit_charge_lrucare(struct page *page, struct mem_cgroup *memcg,
                                        enum charge_type ctype)
{
        struct page_cgroup *pc = lookup_page_cgroup(page);
        /*
         * In some case, SwapCache, FUSE(splice_buf->radixtree), the page
         * is already on LRU. It means the page may on some other page_cgroup's
         * LRU. Take care of it.
         */
        mem_cgroup_lru_del_before_commit(page);
        __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype);
        mem_cgroup_lru_add_after_commit(page);
        return;
}

int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
                                gfp_t gfp_mask)
{
        struct mem_cgroup *memcg = NULL;
        int ret;

        if (mem_cgroup_disabled())
                return 0;
        if (PageCompound(page))
                return 0;

        if (unlikely(!mm))
                mm = &init_mm;

        if (page_is_file_cache(page)) {
                ret = __mem_cgroup_try_charge(mm, gfp_mask, 1, &memcg, true);
                if (ret || !memcg)
                        return ret;

                /*
                 * FUSE reuses pages without going through the final
                 * put that would remove them from the LRU list, make
                 * sure that they get relinked properly.
                 */
                __mem_cgroup_commit_charge_lrucare(page, memcg,
                                        MEM_CGROUP_CHARGE_TYPE_CACHE);
                return ret;
        }
        /* shmem */
        if (PageSwapCache(page)) {
                ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &memcg);
                if (!ret)
                        __mem_cgroup_commit_charge_swapin(page, memcg,
                                        MEM_CGROUP_CHARGE_TYPE_SHMEM);
        } else
                ret = mem_cgroup_charge_common(page, mm, gfp_mask,
                                        MEM_CGROUP_CHARGE_TYPE_SHMEM);

        return ret;
}

/*
 * While swap-in, try_charge -> commit or cancel, the page is locked.
 * And when try_charge() successfully returns, one refcnt to memcg without
 * struct page_cgroup is acquired. This refcnt will be consumed by
 * "commit()" or removed by "cancel()"
 */
int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
                                 struct page *page,
                                 gfp_t mask, struct mem_cgroup **ptr)
{
        struct mem_cgroup *memcg;
        int ret;

        *ptr = NULL;

        if (mem_cgroup_disabled())
                return 0;

        if (!do_swap_account)
                goto charge_cur_mm;
        /*
         * A racing thread's fault, or swapoff, may have already updated
         * the pte, and even removed page from swap cache: in those cases
         * do_swap_page()'s pte_same() test will fail; but there's also a
         * KSM case which does need to charge the page.
         */
        if (!PageSwapCache(page))
                goto charge_cur_mm;
        memcg = try_get_mem_cgroup_from_page(page);
        if (!memcg)
                goto charge_cur_mm;
        *ptr = memcg;
        ret = __mem_cgroup_try_charge(NULL, mask, 1, ptr, true);
        css_put(&memcg->css);
        return ret;
charge_cur_mm:
        if (unlikely(!mm))
                mm = &init_mm;
        return __mem_cgroup_try_charge(mm, mask, 1, ptr, true);
}

static void
__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
                                        enum charge_type ctype)
{
        if (mem_cgroup_disabled())
                return;
        if (!ptr)
                return;
        cgroup_exclude_rmdir(&ptr->css);

        __mem_cgroup_commit_charge_lrucare(page, ptr, ctype);
        /*
         * Now swap is on-memory. This means this page may be
         * counted both as mem and swap....double count.
         * Fix it by uncharging from memsw. Basically, this SwapCache is stable
         * under lock_page(). But in do_swap_page()::memory.c, reuse_swap_page()
         * may call delete_from_swap_cache() before reach here.
         */
        if (do_swap_account && PageSwapCache(page)) {
                swp_entry_t ent = {.val = page_private(page)};
                unsigned short id;
                struct mem_cgroup *memcg;

                id = swap_cgroup_record(ent, 0);
                rcu_read_lock();
                memcg = mem_cgroup_lookup(id);
                if (memcg) {
                        /*
                         * This recorded memcg can be obsolete one. So, avoid
                         * calling css_tryget
                         */
                        if (!mem_cgroup_is_root(memcg))
                                res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
                        mem_cgroup_swap_statistics(memcg, false);
                        mem_cgroup_put(memcg);
                }
                rcu_read_unlock();
        }
        /*
         * At swapin, we may charge account against cgroup which has no tasks.
         * So, rmdir()->pre_destroy() can be called while we do this charge.
         * In that case, we need to call pre_destroy() again. check it here.
         */
        cgroup_release_and_wakeup_rmdir(&ptr->css);
}

void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
{
        __mem_cgroup_commit_charge_swapin(page, ptr,
                                        MEM_CGROUP_CHARGE_TYPE_MAPPED);
}

void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
{
        if (mem_cgroup_disabled())
                return;
        if (!memcg)
                return;
        __mem_cgroup_cancel_charge(memcg, 1);
}

static void mem_cgroup_do_uncharge(struct mem_cgroup *memcg,
                                   unsigned int nr_pages,
                                   const enum charge_type ctype)
{
        struct memcg_batch_info *batch = NULL;
        bool uncharge_memsw = true;

        /* If swapout, usage of swap doesn't decrease */
        if (!do_swap_account || ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT)
                uncharge_memsw = false;

        batch = &current->memcg_batch;
        /*
         * In usual, we do css_get() when we remember memcg pointer.
         * But in this case, we keep res->usage until end of a series of
         * uncharges. Then, it's ok to ignore memcg's refcnt.
         */
        if (!batch->memcg)
                batch->memcg = memcg;
        /*
         * do_batch > 0 when unmapping pages or inode invalidate/truncate.
         * In those cases, all pages freed continuously can be expected to be in
         * the same cgroup and we have chance to coalesce uncharges.
         * But we do uncharge one by one if this is killed by OOM(TIF_MEMDIE)
         * because we want to do uncharge as soon as possible.
         */

        if (!batch->do_batch || test_thread_flag(TIF_MEMDIE))
                goto direct_uncharge;

        if (nr_pages > 1)
                goto direct_uncharge;

        /*
         * In typical case, batch->memcg == mem. This means we can
         * merge a series of uncharges to an uncharge of res_counter.
         * If not, we uncharge res_counter ony by one.
         */
        if (batch->memcg != memcg)
                goto direct_uncharge;
        /* remember freed charge and uncharge it later */
        batch->nr_pages++;
        if (uncharge_memsw)
                batch->memsw_nr_pages++;
        return;
direct_uncharge:
        res_counter_uncharge(&memcg->res, nr_pages * PAGE_SIZE);
        if (uncharge_memsw)
                res_counter_uncharge(&memcg->memsw, nr_pages * PAGE_SIZE);
        if (unlikely(batch->memcg != memcg))
                memcg_oom_recover(memcg);
        return;
}

/*
 * uncharge if !page_mapped(page)
 */
static struct mem_cgroup *
__mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
{
        struct mem_cgroup *memcg = NULL;
        unsigned int nr_pages = 1;
        struct page_cgroup *pc;

        if (mem_cgroup_disabled())
                return NULL;

        if (PageSwapCache(page))
                return NULL;

        if (PageTransHuge(page)) {
                nr_pages <<= compound_order(page);
                VM_BUG_ON(!PageTransHuge(page));
        }
        /*
         * Check if our page_cgroup is valid
         */
        pc = lookup_page_cgroup(page);
        if (unlikely(!pc || !PageCgroupUsed(pc)))
                return NULL;

        lock_page_cgroup(pc);

        memcg = pc->mem_cgroup;

        if (!PageCgroupUsed(pc))
                goto unlock_out;

        switch (ctype) {
        case MEM_CGROUP_CHARGE_TYPE_MAPPED:
        case MEM_CGROUP_CHARGE_TYPE_DROP:
                /* See mem_cgroup_prepare_migration() */
                if (page_mapped(page) || PageCgroupMigration(pc))
                        goto unlock_out;
                break;
        case MEM_CGROUP_CHARGE_TYPE_SWAPOUT:
                if (!PageAnon(page)) {  /* Shared memory */
                        if (page->mapping && !page_is_file_cache(page))
                                goto unlock_out;
                } else if (page_mapped(page)) /* Anon */
                                goto unlock_out;
                break;
        default:
                break;
        }

        mem_cgroup_charge_statistics(memcg, PageCgroupCache(pc), -nr_pages);

        ClearPageCgroupUsed(pc);
        /*
         * pc->mem_cgroup is not cleared here. It will be accessed when it's
         * freed from LRU. This is safe because uncharged page is expected not
         * to be reused (freed soon). Exception is SwapCache, it's handled by
         * special functions.
         */

        unlock_page_cgroup(pc);
        /*
         * even after unlock, we have memcg->res.usage here and this memcg
         * will never be freed.
         */
        memcg_check_events(memcg, page);
        if (do_swap_account && ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT) {
                mem_cgroup_swap_statistics(memcg, true);
                mem_cgroup_get(memcg);
        }
        if (!mem_cgroup_is_root(memcg))
                mem_cgroup_do_uncharge(memcg, nr_pages, ctype);

        return memcg;

unlock_out:
        unlock_page_cgroup(pc);
        return NULL;
}

void mem_cgroup_uncharge_page(struct page *page)
{
        /* early check. */
        if (page_mapped(page))
                return;
        if (page->mapping && !PageAnon(page))
                return;
        __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_MAPPED);
}

void mem_cgroup_uncharge_cache_page(struct page *page)
{
        VM_BUG_ON(page_mapped(page));
        VM_BUG_ON(page->mapping);
        __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE);
}

/*
 * Batch_start/batch_end is called in unmap_page_range/invlidate/trucate.
 * In that cases, pages are freed continuously and we can expect pages
 * are in the same memcg. All these calls itself limits the number of
 * pages freed at once, then uncharge_start/end() is called properly.
 * This may be called prural(2) times in a context,
 */

void mem_cgroup_uncharge_start(void)
{
        current->memcg_batch.do_batch++;
        /* We can do nest. */
        if (current->memcg_batch.do_batch == 1) {
                current->memcg_batch.memcg = NULL;
                current->memcg_batch.nr_pages = 0;
                current->memcg_batch.memsw_nr_pages = 0;
        }
}

void mem_cgroup_uncharge_end(void)
{
        struct memcg_batch_info *batch = &current->memcg_batch;

        if (!batch->do_batch)
                return;

        batch->do_batch--;
        if (batch->do_batch) /* If stacked, do nothing. */
                return;

        if (!batch->memcg)
                return;
        /*
         * This "batch->memcg" is valid without any css_get/put etc...
         * bacause we hide charges behind us.
         */
        if (batch->nr_pages)
                res_counter_uncharge(&batch->memcg->res,
                                     batch->nr_pages * PAGE_SIZE);
        if (batch->memsw_nr_pages)
                res_counter_uncharge(&batch->memcg->memsw,
                                     batch->memsw_nr_pages * PAGE_SIZE);
        memcg_oom_recover(batch->memcg);
        /* forget this pointer (for sanity check) */
        batch->memcg = NULL;
}

#ifdef CONFIG_SWAP
/*
 * called after __delete_from_swap_cache() and drop "page" account.
 * memcg information is recorded to swap_cgroup of "ent"
 */
void
mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout)
{
        struct mem_cgroup *memcg;
        int ctype = MEM_CGROUP_CHARGE_TYPE_SWAPOUT;

        if (!swapout) /* this was a swap cache but the swap is unused ! */
                ctype = MEM_CGROUP_CHARGE_TYPE_DROP;

        memcg = __mem_cgroup_uncharge_common(page, ctype);

        /*
         * record memcg information,  if swapout && memcg != NULL,
         * mem_cgroup_get() was called in uncharge().
         */
        if (do_swap_account && swapout && memcg)
                swap_cgroup_record(ent, css_id(&memcg->css));
}
#endif

#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
/*
 * called from swap_entry_free(). remove record in swap_cgroup and
 * uncharge "memsw" account.
 */
void mem_cgroup_uncharge_swap(swp_entry_t ent)
{
        struct mem_cgroup *memcg;
        unsigned short id;

        if (!do_swap_account)
                return;

        id = swap_cgroup_record(ent, 0);
        rcu_read_lock();
        memcg = mem_cgroup_lookup(id);
        if (memcg) {
                /*
                 * We uncharge this because swap is freed.
                 * This memcg can be obsolete one. We avoid calling css_tryget
                 */
                if (!mem_cgroup_is_root(memcg))
                        res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
                mem_cgroup_swap_statistics(memcg, false);
                mem_cgroup_put(memcg);
        }
        rcu_read_unlock();
}

/**
 * mem_cgroup_move_swap_account - move swap charge and swap_cgroup's record.
 * @entry: swap entry to be moved
 * @from:  mem_cgroup which the entry is moved from
 * @to:  mem_cgroup which the entry is moved to
 * @need_fixup: whether we should fixup res_counters and refcounts.
 *
 * It succeeds only when the swap_cgroup's record for this entry is the same
 * as the mem_cgroup's id of @from.
 *
 * Returns 0 on success, -EINVAL on failure.
 *
 * The caller must have charged to @to, IOW, called res_counter_charge() about
 * both res and memsw, and called css_get().
 */
static int mem_cgroup_move_swap_account(swp_entry_t entry,
                struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup)
{
        unsigned short old_id, new_id;

        old_id = css_id(&from->css);
        new_id = css_id(&to->css);

        if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) {
                mem_cgroup_swap_statistics(from, false);
                mem_cgroup_swap_statistics(to, true);
                /*
                 * This function is only called from task migration context now.
                 * It postpones res_counter and refcount handling till the end
                 * of task migration(mem_cgroup_clear_mc()) for performance
                 * improvement. But we cannot postpone mem_cgroup_get(to)
                 * because if the process that has been moved to @to does
                 * swap-in, the refcount of @to might be decreased to 0.
                 */
                mem_cgroup_get(to);
                if (need_fixup) {
                        if (!mem_cgroup_is_root(from))
                                res_counter_uncharge(&from->memsw, PAGE_SIZE);
                        mem_cgroup_put(from);
                        /*
                         * we charged both to->res and to->memsw, so we should
                         * uncharge to->res.
                         */
                        if (!mem_cgroup_is_root(to))
                                res_counter_uncharge(&to->res, PAGE_SIZE);
                }
                return 0;
        }
        return -EINVAL;
}
#else
static inline int mem_cgroup_move_swap_account(swp_entry_t entry,
                struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup)
{
        return -EINVAL;
}
#endif

/*
 * Before starting migration, account PAGE_SIZE to mem_cgroup that the old
 * page belongs to.
 */
int mem_cgroup_prepare_migration(struct page *page,
        struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask)
{
        struct mem_cgroup *memcg = NULL;
        struct page_cgroup *pc;
        enum charge_type ctype;
        int ret = 0;

        *ptr = NULL;

        VM_BUG_ON(PageTransHuge(page));
        if (mem_cgroup_disabled())
                return 0;

        pc = lookup_page_cgroup(page);
        lock_page_cgroup(pc);
        if (PageCgroupUsed(pc)) {
                memcg = pc->mem_cgroup;
                css_get(&memcg->css);
                /*
                 * At migrating an anonymous page, its mapcount goes down
                 * to 0 and uncharge() will be called. But, even if it's fully
                 * unmapped, migration may fail and this page has to be
                 * charged again. We set MIGRATION flag here and delay uncharge
                 * until end_migration() is called
                 *
                 * Corner Case Thinking
                 * A)
                 * When the old page was mapped as Anon and it's unmap-and-freed
                 * while migration was ongoing.
                 * If unmap finds the old page, uncharge() of it will be delayed
                 * until end_migration(). If unmap finds a new page, it's
                 * uncharged when it make mapcount to be 1->0. If unmap code
                 * finds swap_migration_entry, the new page will not be mapped
                 * and end_migration() will find it(mapcount==0).
                 *
                 * B)
                 * When the old page was mapped but migraion fails, the kernel
                 * remaps it. A charge for it is kept by MIGRATION flag even
                 * if mapcount goes down to 0. We can do remap successfully
                 * without charging it again.
                 *
                 * C)
                 * The "old" page is under lock_page() until the end of
                 * migration, so, the old page itself will not be swapped-out.
                 * If the new page is swapped out before end_migraton, our
                 * hook to usual swap-out path will catch the event.
                 */
                if (PageAnon(page))
                        SetPageCgroupMigration(pc);
        }
        unlock_page_cgroup(pc);
        /*
         * If the page is not charged at this point,
         * we return here.
         */
        if (!memcg)
                return 0;

        *ptr = memcg;
        ret = __mem_cgroup_try_charge(NULL, gfp_mask, 1, ptr, false);
        css_put(&memcg->css);/* drop extra refcnt */
        if (ret || *ptr == NULL) {
                if (PageAnon(page)) {
                        lock_page_cgroup(pc);
                        ClearPageCgroupMigration(pc);
                        unlock_page_cgroup(pc);
                        /*
                         * The old page may be fully unmapped while we kept it.
                         */
                        mem_cgroup_uncharge_page(page);