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mm: vmscan: do not allow kswapd to scan at maximum priority

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Page reclaim at priority 0 will scan the entire LRU as priority 0 is
considered to be a near OOM condition.  Kswapd can reach priority 0
quite easily if it is encountering a large number of pages it cannot
reclaim such as pages under writeback.  When this happens, kswapd
reclaims very aggressively even though there may be no real risk of
allocation failure or OOM.

This patch prevents kswapd reaching priority 0 and trying to reclaim the
world.  Direct reclaimers will still reach priority 0 in the event of an
OOM situation.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Tested-by: Zlatko Calusic <zcalusic@bitsync.net>
Cc: dormando <dormando@rydia.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2013-07-03 15:01:48 -07:00 committed by Linus Torvalds
parent 2ab44f4345
commit 9aa41348a8
1 changed files with 1 additions and 1 deletions
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2
mm/vmscan.c
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@ -2929,7 +2929,7 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
*/
if (raise_priority || !sc.nr_reclaimed)
sc.priority--;
} while (sc.priority >= 0 &&
} while (sc.priority >= 1 &&
!pgdat_balanced(pgdat, order, *classzone_idx));
out: