linux-kernel - Re: kswapd craziness in 3.7

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Date:	Thu, 06 Dec 2012 15:32:18 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Bruno Wolff III <bruno@...ff.to>,
	Thorsten Leemhuis <fedora@...mhuis.info>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	George Spelvin <linux@...izon.com>,
	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>,
	Tomas Racek <tracek@...hat.com>, Jan Kara <jack@...e.cz>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Josh Boyer <jwboyer@...il.com>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Jiri Slaby <jslaby@...e.cz>,
	Zdenek Kabelac <zkabelac@...hat.com>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	John Ellson <john.ellson@...cast.net>
Subject: Re: kswapd craziness in 3.7

On 12/06/2012 03:23 PM, Johannes Weiner wrote:

> From: Johannes Weiner <hannes@...xchg.org>
> Subject: [patch] mm: vmscan: fix inappropriate zone congestion clearing
>
> c702418 ("mm: vmscan: do not keep kswapd looping forever due to
> individual uncompactable zones") removed zone watermark checks from
> the compaction code in kswapd but left in the zone congestion
> clearing, which now happens unconditionally on higher order reclaim.
>
> This messes up the reclaim throttling logic for zones with
> dirty/writeback pages, where zones should only lose their congestion
> status when their watermarks have been restored.
>
> Remove the clearing from the zone compaction section entirely.  The
> preliminary zone check and the reclaim loop in kswapd will clear it if
> the zone is considered balanced.
>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Reviewed-by: Rik van Riel <riel@...hat.com>


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