memcg: reclaim shouldn't change zone->recent_rotated statistics

memcg reclaim shouldn't change zone->recent_rotated statistics.  If
memcgroup reclaim changes zone statistics, global reclaim can get a bit
confused.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmscan.c b/mm/vmscan.c
index d500b90..da7c3a2 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1246,7 +1246,8 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
         * This helps balance scan pressure between file and anonymous
         * pages in get_scan_ratio.
         */
-       zone->recent_rotated[!!file] += pgmoved;
+       if (scan_global_lru(sc))
+               zone->recent_rotated[!!file] += pgmoved;
 
        /*
         * Move the pages to the [file or anon] inactive list.