linux-kernel - [PATCH] mm/memcg: add unlikely to mercg->move_charge_at

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Date:	Mon, 18 Jun 2012 21:10:21 +0800
From:	Wanpeng Li <liwp.linux@...il.com>
To:	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	cgroups@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Gavin Shan <shangw@...ux.vnet.ibm.com>,
	Wanpeng Li <liwp.linux@...il.com>
Subject: [PATCH] mm/memcg: add unlikely to mercg->move_charge_at_immigrate

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

move_charge_at_immigrate feature is disabled by default. Charges
are moved only when you move mm->owner and it also add additional
overhead.

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 a9c3d01..795a00f 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5316,7 +5316,7 @@ static int mem_cgroup_can_attach(struct cgroup *cgroup,
 	int ret = 0;
 	struct mem_cgroup *memcg = mem_cgroup_from_cont(cgroup);
 
-	if (memcg->move_charge_at_immigrate) {
+	if (unlikely(memcg->move_charge_at_immigrate)) {
 		struct mm_struct *mm;
 		struct mem_cgroup *from = mem_cgroup_from_task(p);
 
-- 
1.7.9.5

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