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Date: Tue, 9 Apr 2013 12:07:00 +0100 From: Mel Gorman <mgorman@...e.de> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Jiri Slaby <jslaby@...e.cz>, Valdis Kletnieks <Valdis.Kletnieks@...edu>, Rik van Riel <riel@...hat.com>, Zlatko Calusic <zcalusic@...sync.net>, Johannes Weiner <hannes@...xchg.org>, dormando <dormando@...ia.net>, Satoru Moriya <satoru.moriya@....com>, Michal Hocko <mhocko@...e.cz>, Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de> Subject: [PATCH 05/10] mm: vmscan: Do not allow kswapd to scan at maximum priority 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@...e.de> Acked-by: Rik van Riel <riel@...hat.com> Reviewed-by: Michal Hocko <mhocko@...e.cz> --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index a9e68b4..3d8b80a 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2906,7 +2906,7 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order, */ if (raise_priority || !this_reclaimed) sc.priority--; - } while (sc.priority >= 0 && + } while (sc.priority >= 1 && !pgdat_balanced(pgdat, order, *classzone_idx)); out: -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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