From 788aebf15f3fa37940e0745cab72547e20683bf2 Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <redacted>
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 <redacted>
---
 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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