From: Minchan Kim <minchan.kim@gmail.com>
Date: Wed, 22 Dec 2010 01:24:16 +0000 (-0800)
Subject: mm/compaction.c: avoid double mem_cgroup_del_lru()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=dd9e5efe3aa9fc5b1ce484a531ecdba3a7a30bbf;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

mm/compaction.c: avoid double mem_cgroup_del_lru()

del_page_from_lru_list() already called mem_cgroup_del_lru().  So we must
not call it again.  It adds unnecessary overhead.

It was not a runtime bug because the TestClearPageCgroupAcctLRU() early in
mem_cgroup_del_lru_list() will prevent any double-deletion, etc.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/compaction.c b/mm/compaction.c
index 4d709ee59013..1a8894eadf72 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -279,7 +279,6 @@ static unsigned long isolate_migratepages(struct zone *zone,
 		/* Successfully isolated */
 		del_page_from_lru_list(zone, page, page_lru(page));
 		list_add(&page->lru, migratelist);
-		mem_cgroup_del_lru(page);
 		cc->nr_migratepages++;
 
 		/* Avoid isolating too much */