linux-kernel - [RFC][PATCH 2/7] memcg: don't use mem_cgroup

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Date:	Wed, 3 Apr 2013 17:12:21 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	<linux-mm@...ck.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Glauber Costa <glommer@...allels.com>,
	Michal Hocko <mhocko@...e.cz>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: [RFC][PATCH 2/7] memcg: don't use mem_cgroup_get() when creating
 a kmemcg cache

Use css_get()/css_put() instead of mem_cgroup_get()/mem_cgroup_put().

Signed-off-by: Li Zefan <lizefan@...wei.com>
---
 mm/memcontrol.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 43ca91d..dafacb8 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3191,7 +3191,7 @@ void memcg_release_cache(struct kmem_cache *s)
 	list_del(&s->memcg_params->list);
 	mutex_unlock(&memcg->slab_caches_mutex);
 
-	mem_cgroup_put(memcg);
+	css_put(&memcg->css);
 out:
 	kfree(s->memcg_params);
 }
@@ -3350,16 +3350,18 @@ static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
 
 	mutex_lock(&memcg_cache_mutex);
 	new_cachep = cachep->memcg_params->memcg_caches[idx];
-	if (new_cachep)
+	if (new_cachep) {
+		css_put(&memcg->css);
 		goto out;
+	}
 
 	new_cachep = kmem_cache_dup(memcg, cachep);
 	if (new_cachep == NULL) {
 		new_cachep = cachep;
+		css_put(&memcg->css);
 		goto out;
 	}
 
-	mem_cgroup_get(memcg);
 	atomic_set(&new_cachep->memcg_params->nr_pages , 0);
 
 	cachep->memcg_params->memcg_caches[idx] = new_cachep;
@@ -3449,8 +3451,6 @@ static void memcg_create_cache_work_func(struct work_struct *w)
 
 	cw = container_of(w, struct create_work, work);
 	memcg_create_kmem_cache(cw->memcg, cw->cachep);
-	/* Drop the reference gotten when we enqueued. */
-	css_put(&cw->memcg->css);
 	kfree(cw);
 }
 
-- 
1.8.0.2

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