From b9982f8d27f893de2e8e98a25c68bb838b5311a4 Mon Sep 17 00:00:00 2001 From: Michal Hocko Date: Wed, 10 Dec 2014 15:43:51 -0800 Subject: mm: memcontrol: micro-optimize mem_cgroup_split_huge_fixup() Don't call lookup_page_cgroup() when memcg is disabled. Cc: Johannes Weiner Cc: Vladimir Davydov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memcontrol.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'mm/memcontrol.c') diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 420461bcaefd..8c10d4ca9c3f 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3174,7 +3174,7 @@ static inline void memcg_unregister_all_caches(struct mem_cgroup *memcg) */ void mem_cgroup_split_huge_fixup(struct page *head) { - struct page_cgroup *head_pc = lookup_page_cgroup(head); + struct page_cgroup *head_pc; struct page_cgroup *pc; struct mem_cgroup *memcg; int i; @@ -3182,6 +3182,8 @@ void mem_cgroup_split_huge_fixup(struct page *head) if (mem_cgroup_disabled()) return; + head_pc = lookup_page_cgroup(head); + memcg = head_pc->mem_cgroup; for (i = 1; i < HPAGE_PMD_NR; i++) { pc = head_pc + i; -- cgit v1.2.3-55-g7522