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vmscan: avoid setting zone congested if no page dirty

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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>
This commit is contained in:
Shaohua Li 2010-11-11 14:05:17 -08:00 committed by Linus Torvalds
parent 38715258aa
commit 1dce071e18
1 changed files with 1 additions and 1 deletions
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2
mm/vmscan.c
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@ -913,7 +913,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
* 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);