From: Shaohua Li <shaohua.li@intel.com>
To: linux-mm <linux-mm@kvack.org>
Cc: mel <mel@csn.ul.ie>, Andrew Morton <akpm@linux-foundation.org>
Subject: [patch]vmscan: avoid set zone congested if no page dirty
Date: Thu, 04 Nov 2010 08:50:58 +0800 [thread overview]
Message-ID: <1288831858.23014.129.camel@sli10-conroe> (raw)
nr_dirty and nr_congested are increased only when 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>
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b8a6fdc..d31d7ce 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);
--
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next reply other threads:[~2010-11-04 0:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-04 0:50 Shaohua Li [this message]
2010-11-04 14:00 ` Johannes Weiner
2010-11-05 2:17 ` Minchan Kim
2010-11-05 14:44 ` Mel Gorman
2010-11-10 23:16 ` Andrew Morton
2010-11-11 10:29 ` Mel Gorman
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