linux-kernel - Re: [PATCH 05/10] mm: vmscan: Do not allow kswapd to scan at maximum priority

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Date:	Thu, 18 Apr 2013 08:11:06 -0700
From:	Johannes Weiner <hannes@...xchg.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Rik van Riel <riel@...hat.com>,
	Zlatko Calusic <zcalusic@...sync.net>,
	dormando <dormando@...ia.net>, Michal Hocko <mhocko@...e.cz>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/10] mm: vmscan: Do not allow kswapd to scan at maximum
 priority

On Thu, Apr 11, 2013 at 08:57:53PM +0100, Mel Gorman wrote:
> 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>

Acked-by: Johannes Weiner <hannes@...xchg.org>
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