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authorShaohua Li <shaohua.li@intel.com>2010-11-11 14:05:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-11-12 07:55:31 -0800
commit1dce071e18b7264457d17c0dec4c7e430bfaee7d (patch)
treeced52f7f8e4177f9ea37f891f4d33d0a5109e651
parent38715258aa2e8cd94bd4aafadc544e5104efd551 (diff)
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vmscan: avoid setting zone congested if no page dirty
nr_dirty and nr_congested are increased only when the page is dirty. So if all pages are clean, both them will be zero. In this case, we should not mark the zone congested. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/vmscan.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b8a6fdc2131..d31d7ce52c0 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -913,7 +913,7 @@ keep_lumpy:
* back off and wait for congestion to clear because further reclaim
* will encounter the same problem
*/
- if (nr_dirty == nr_congested)
+ if (nr_dirty == nr_congested && nr_dirty != 0)
zone_set_flag(zone, ZONE_CONGESTED);
free_page_list(&free_pages);