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 <[email protected]>
Acked-by: Balbir Singh <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Reviewed-by: Johannes Weiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/compaction.c b/mm/compaction.c
index 4d709ee5901370842534224a9f81e7d13943e196..1a8894eadf7275fc2a41f002cadaca4f86684cbf 100644 (file)
--- 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 */