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mm: vmscan: fix misused nr_reclaimed in shrink_mem_cgroup_zone()

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The value of nr_reclaimed is the number of pages reclaimed in the current
round of the loop, whereas nr_to_reclaim should be compared with the
number of pages reclaimed in all rounds.

In each round of the loop, reclaimed pages are cut off from the reclaim
goal, and the loop stops once the goal achieved.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hillf Danton 2012-03-21 16:33:50 -07:00 committed by Linus Torvalds
parent 69c978232a
commit c38446cc65
1 changed files with 6 additions and 1 deletions
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7
mm/vmscan.c
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@ -2112,7 +2112,12 @@ static void shrink_mem_cgroup_zone(int priority, struct mem_cgroup_zone *mz,
* with multiple processes reclaiming pages, the total
* freeing target can get unreasonably large.
*/
if (nr_reclaimed >= nr_to_reclaim && priority < DEF_PRIORITY)
if (nr_reclaimed >= nr_to_reclaim)
nr_to_reclaim = 0;
else
nr_to_reclaim -= nr_reclaimed;
if (!nr_to_reclaim && priority < DEF_PRIORITY)
break;
}
blk_finish_plug(&plug);