Commit 1dce071e authored Nov 11, 2010 by Shaohua Li Committed by Linus Torvalds Nov 12, 2010

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>

parent 38715258

mm/vmscan.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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);

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