linux-kernel - [PATCH 11/12] memcg: kill memcg refcnt

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Date:	Mon, 8 Apr 2013 14:36:04 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Tejun Heo <tj@...nel.org>, Glauber Costa <glommer@...allels.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [PATCH 11/12] memcg: kill memcg refcnt

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

Signed-off-by: Li Zefan <lizefan@...wei.com>
Acked-by: Michal Hocko <mhocko@...e.cz>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 mm/memcontrol.c | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9ca5a99..a6d44bc 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -297,8 +297,6 @@ struct mem_cgroup {
 	bool		oom_lock;
 	atomic_t	under_oom;
 
-	atomic_t	refcnt;
-
 	int	swappiness;
 	/* OOM-Killer disable */
 	int		oom_kill_disable;
@@ -501,8 +499,6 @@ 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)
 {
@@ -6124,17 +6120,6 @@ 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.
  */
@@ -6194,7 +6179,6 @@ 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);
@@ -6285,7 +6269,7 @@ static void mem_cgroup_css_free(struct cgroup *cont)
 
 	mem_cgroup_sockets_destroy(memcg);
 
-	mem_cgroup_put(memcg);
+	call_rcu(&memcg->rcu_freeing, free_rcu);
 }
 
 #ifdef CONFIG_MMU
-- 
1.8.0.2
--
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