[PATCH] mm/memcg: add unlikely to mercg->move_charge_at_immigrate

[Wanpeng Li]

From: Wanpeng Li <liwp@xxxxxxxxxxxxxxxxxx>

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@xxxxxxxxx>
---
 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/