linux-kernel - [PATCH] memcg: don't initialize kmem-cache destroying work for root caches

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Date:	Mon,  5 Aug 2013 20:09:40 +0400
From:	Andrey Vagin <avagin@...nvz.org>
To:	linux-mm@...ck.org
Cc:	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrey Vagin <avagin@...nvz.org>,
	Glauber Costa <glommer@...nvz.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	<stable@...r.kernel.org>
Subject: [PATCH] memcg: don't initialize kmem-cache destroying work for root caches

struct memcg_cache_params has a union. Different parts of this union
are used for root and non-root caches. A part with destroying work is
used only for non-root caches.

I fixed the same problem in another place v3.9-rc1-16204-gf101a94, but
didn't notice this one.

Cc: Glauber Costa <glommer@...nvz.org>
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>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc: <stable@...r.kernel.org>    [3.9.x]
Signed-off-by: Andrey Vagin <avagin@...nvz.org>
---
 mm/memcontrol.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c290a1c..c5792a5 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3195,11 +3195,11 @@ int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s,
 	if (!s->memcg_params)
 		return -ENOMEM;
 
-	INIT_WORK(&s->memcg_params->destroy,
-			kmem_cache_destroy_work_func);
 	if (memcg) {
 		s->memcg_params->memcg = memcg;
 		s->memcg_params->root_cache = root_cache;
+		INIT_WORK(&s->memcg_params->destroy,
+				kmem_cache_destroy_work_func);
 	} else
 		s->memcg_params->is_root_cache = true;
 
-- 
1.8.3.1

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