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memcg: kill memcg refcnt

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Now memcg has the same life cycle as its corresponding cgroup.  Kill the
useless refcnt.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Glauber Costa <glommer@openvz.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zefan 2013-07-08 16:00:37 -07:00 committed by Linus Torvalds
parent 8d76a97978
commit e0743e6bc5
1 changed files with 1 additions and 17 deletions
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18
mm/memcontrol.c
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@ -299,8 +299,6 @@ struct mem_cgroup {
bool oom_lock;
atomic_t under_oom;
atomic_t refcnt;
int swappiness;
/* OOM-Killer disable */
int oom_kill_disable;
@ -503,8 +501,6 @@ enum res_type {
*/
static DEFINE_MUTEX(memcg_create_mutex);
static void mem_cgroup_put(struct mem_cgroup *memcg);
static inline
struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *s)
{
@ -6238,17 +6234,6 @@ static void free_rcu(struct rcu_head *rcu_head)
schedule_work(&memcg->work_freeing);
}
static void __mem_cgroup_put(struct mem_cgroup *memcg, int count)
{
if (atomic_sub_and_test(count, &memcg->refcnt))
call_rcu(&memcg->rcu_freeing, free_rcu);
}
static void mem_cgroup_put(struct mem_cgroup *memcg)
{
__mem_cgroup_put(memcg, 1);
}
/*
* Returns the parent mem_cgroup in memcgroup hierarchy with hierarchy enabled.
*/
@ -6308,7 +6293,6 @@ mem_cgroup_css_alloc(struct cgroup *cont)
memcg->last_scanned_node = MAX_NUMNODES;
INIT_LIST_HEAD(&memcg->oom_notify);
atomic_set(&memcg->refcnt, 1);
memcg->move_charge_at_immigrate = 0;
mutex_init(&memcg->thresholds_lock);
spin_lock_init(&memcg->move_lock);
@ -6399,7 +6383,7 @@ static void mem_cgroup_css_free(struct cgroup *cont)
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
memcg_destroy_kmem(memcg);
__mem_cgroup_free(memcg);
call_rcu(&memcg->rcu_freeing, free_rcu);
}
#ifdef CONFIG_MMU