>From 788aebf15f3fa37940e0745cab72547e20683bf2 Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Date: Thu, 12 Jan 2012 16:08:33 +0900
Subject: [PATCH 1/7] memcg: remove unnecessary check in mem_cgroup_update_page_stat()
commit 10ea69f1182b removes move_lock_page_cgroup() in thp-split path.
So, this PageTransHuge() check is unnecessary, too.
Note:
- considering when mem_cgroup_update_page_stat() is called,
there will be no race between split_huge_page() and update_page_stat().
All required locks are held in higher level.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 21ba356..08b988d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1866,7 +1866,7 @@ void mem_cgroup_update_page_stat(struct page *page,
if (unlikely(!memcg || !PageCgroupUsed(pc)))
goto out;
/* pc->mem_cgroup is unstable ? */
- if (unlikely(mem_cgroup_stealed(memcg)) || PageTransHuge(page)) {
+ if (unlikely(mem_cgroup_stealed(memcg))) {
/* take a lock against to access pc->mem_cgroup */
move_lock_page_cgroup(pc, &flags);
need_unlock = true;
--
1.7.4.1
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