[BUGFIX] [mmotm] Reduce memory resource controller overhead fixes

[Balbir Singh <balbir@linux.vnet.ibm.com>]

From: Balbir Singh <balbir@linux.vnet.ibm.com>

Fix an incorrect condition in memcg lru manipulation

The PageAcctLRU bit itself does not mean a lot without checking
if the mem cgroup is the same as the root cgroup. This patch
fixes a left over from the previous versions.

Reported-by:KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

---

 mm/memcontrol.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 4cc9d0d..0608719 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -414,7 +414,7 @@ void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru)
 	 */
 	smp_rmb();
 	/* unused or root page is not rotated. */
-	if (!PageCgroupUsed(pc) || PageCgroupAcctLRU(pc))
+	if (!PageCgroupUsed(pc) || mem_cgroup_is_root(pc->mem_cgroup))
 		return;
 	mz = page_cgroup_zoneinfo(pc);
 	list_move(&pc->lru, &mz->lists[lru]);

-- 
	Balbir

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