linux-kernel - [PATCH v12 03/18] memcg: move initialization to memcg creation

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Message-ID: <c4d6f9efa834f8a9a02e211583aa35c17fd71cf7.1385974612.git.vdavydov@parallels.com>
Date:	Mon, 2 Dec 2013 15:19:38 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	<hannes@...xchg.org>, <mhocko@...e.cz>, <dchinner@...hat.com>,
	<akpm@...ux-foundation.org>
CC:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<cgroups@...r.kernel.org>, <devel@...nvz.org>,
	<glommer@...nvz.org>, <vdavydov@...allels.com>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: [PATCH v12 03/18] memcg: move initialization to memcg creation

From: Glauber Costa <glommer@...nvz.org>

Those structures are only used for memcgs that are effectively using
kmemcg. However, in a later patch I intend to use scan that list
inconditionally (list empty meaning no kmem caches present), which
simplifies the code a lot.

So move the initialization to early kmem creation.

Signed-off-by: Glauber Costa <glommer@...nvz.org>
Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Balbir Singh <bsingharora@...il.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 mm/memcontrol.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 144cb4c..3a4e2f8 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3122,8 +3122,6 @@ int memcg_update_cache_sizes(struct mem_cgroup *memcg)
 	}
 
 	memcg->kmemcg_id = num;
-	INIT_LIST_HEAD(&memcg->memcg_slab_caches);
-	mutex_init(&memcg->slab_caches_mutex);
 	return 0;
 }
 
@@ -5909,6 +5907,8 @@ static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
 {
 	int ret;
 
+	INIT_LIST_HEAD(&memcg->memcg_slab_caches);
+	mutex_init(&memcg->slab_caches_mutex);
 	memcg->kmemcg_id = -1;
 	ret = memcg_propagate_kmem(memcg);
 	if (ret)
-- 
1.7.10.4

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