[PATCH v3 3/4] memcg: optimize memcg_get_hierarchical_limit

[Wanpeng Li <liwp.linux@xxxxxxxxx>]

From: Wanpeng Li <liwp@xxxxxxxxxxxxxxxxxx>

Optimize memcg_get_hierarchical_limit to save cpu cycle.

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 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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