linux-kernel - [PATCH v3 3/4] memcg: optimize memcg_get_hierarchical

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Message-Id: <1340613872-9581-1-git-send-email-liwp.linux@gmail.com>
Date:	Mon, 25 Jun 2012 16:44:32 +0800
From:	Wanpeng Li <liwp.linux@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <bsingharora@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mike Frysinger <vapier@...too.org>,
	Arun Sharma <asharma@...com>, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, Wanpeng Li <liwp.linux@...il.com>
Subject: [PATCH v3 3/4] memcg: optimize memcg_get_hierarchical_limit

From: Wanpeng Li <liwp@...ux.vnet.ibm.com>

Optimize memcg_get_hierarchical_limit to save cpu cycle.

Signed-off-by: Wanpeng Li <liwp.linux@...il.com>
---
 mm/memcontrol.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2e81328..4520b57 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3917,9 +3917,9 @@ static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
 
 	min_limit = res_counter_read_u64(&memcg->res, RES_LIMIT);
 	min_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
-	cgroup = memcg->css.cgroup;
 	if (!memcg->use_hierarchy)
 		goto out;
+	cgroup = memcg->css.cgroup;
 
 	while (cgroup->parent) {
 		cgroup = cgroup->parent;
-- 
1.7.9.5

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