linux-kernel - Re: [PATCH] mm,vmscan: only loop back if compaction would fail in all zones

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Date:	Mon, 26 Nov 2012 10:32:12 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>,
	akpm@...ux-foundation.org, mgorman@...e.de,
	Valdis.Kletnieks@...edu, jirislaby@...il.com, jslaby@...e.cz,
	zkabelac@...hat.com, mm-commits@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH] mm,vmscan: only loop back if compaction would fail in
 all zones

On 11/25/2012 11:10 PM, Johannes Weiner wrote:

> From: Johannes Weiner <hannes@...xchg.org>
> Subject: [patch] mm: vmscan: fix endless loop in kswapd balancing
>
> Kswapd does not in all places have the same criteria for when it
> considers a zone balanced.  This leads to zones being not reclaimed
> because they are considered just fine and the compaction checks to
> loop over the zonelist again because they are considered unbalanced,
> causing kswapd to run forever.
>
> Add a function, zone_balanced(), that checks the watermark and if
> compaction has enough free memory to do its job.  Then use it
> uniformly for when kswapd needs to check if a zone is balanced.
>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

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


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