From: Li Zefan <lizefan@huawei.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Tejun Heo <tj@kernel.org>, Glauber Costa <glommer@parallels.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Johannes Weiner <hannes@cmpxchg.org>,
LKML <linux-kernel@vger.kernel.org>,
Cgroups <cgroups@vger.kernel.org>,
linux-mm@kvack.org
Subject: [PATCH 8/9] memcg: kill memcg refcnt
Date: Fri, 17 May 2013 15:05:08 +0800 [thread overview]
Message-ID: <5195D6A4.8060109@huawei.com> (raw)
In-Reply-To: <5195D5F8.7000609@huawei.com>
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>
---
mm/memcontrol.c | 18 +-----------------
1 file changed, 1 insertion(+), 17 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c6d267a..348126a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -303,8 +303,6 @@ struct mem_cgroup {
bool oom_lock;
atomic_t under_oom;
- atomic_t refcnt;
-
int swappiness;
/* OOM-Killer disable */
int oom_kill_disable;
@@ -508,8 +506,6 @@ 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)
{
@@ -6170,17 +6166,6 @@ 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.
*/
@@ -6240,7 +6225,6 @@ 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);
@@ -6332,7 +6316,7 @@ 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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next prev parent reply other threads:[~2013-05-17 7:06 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-17 7:02 [PATCH 0/12][V3] memcg: make memcg's life cycle the same as cgroup Li Zefan
2013-05-17 7:03 ` [PATCH 1/9] Revert "memcg: avoid dangling reference count in creation failure." Li Zefan
2013-05-17 7:03 ` [PATCH 2/9] memcg, kmem: fix reference count handling on the error path Li Zefan
2013-05-17 7:03 ` [PATCH 3/9] memcg: use css_get() in sock_update_memcg() Li Zefan
2013-05-17 7:03 ` [PATCH 4/9] memcg: don't use mem_cgroup_get() when creating a kmemcg cache Li Zefan
2013-05-17 7:04 ` [PATCH 5/9] memcg: use css_get/put when charging/uncharging kmem Li Zefan
2013-05-17 18:08 ` Tejun Heo
2013-05-22 8:36 ` Li Zefan
2013-05-24 7:54 ` Michal Hocko
2013-05-30 5:48 ` Tejun Heo
2013-05-30 15:12 ` Michal Hocko
2013-05-17 7:04 ` [PATCH 6/9] memcg: use css_get/put for swap memcg Li Zefan
2013-05-17 7:04 ` [PATCH 7/9] memcg: don't need to get a reference to the parent Li Zefan
2013-05-17 7:05 ` Li Zefan [this message]
2013-05-17 7:05 ` [PATCH 9/9] memcg: don't need to free memcg via RCU or workqueue Li Zefan
2013-05-17 7:06 ` [PATCH 0/12][V3] memcg: make memcg's life cycle the same as cgroup Li Zefan
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