linux-kernel - Re: [PATCH] vmscan: Stop kswapd waiting on congestion when the min watermark is not being met

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Message-Id: <200911131926.25291.elendil@planet.nl>
Date:	Fri, 13 Nov 2009 19:26:21 +0100
From:	Frans Pop <elendil@...net.nl>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Sven Geggus <lists@...hsschwanzdomain.de>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Tobias Oetiker <tobi@...iker.ch>, linux-kernel@...r.kernel.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Stephan von Krawczynski <skraw@...net.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [PATCH] vmscan: Stop kswapd waiting on congestion when the min watermark is not being met

On Friday 13 November 2009, Mel Gorman wrote:
> If reclaim fails to make sufficient progress, the priority is raised.
> Once the priority is higher, kswapd starts waiting on congestion.
>  However, if the zone is below the min watermark then kswapd needs to
> continue working without delay as there is a danger of an increased rate
> of GFP_ATOMIC allocation failure.
>
> This patch changes the conditions under which kswapd waits on
> congestion by only going to sleep if the min watermarks are being met.
>
> This patch replaces
> vmscan-take-order-into-consideration-when-deciding-if-kswapd-is-in-troub
>le.patch .
>
> [mel@....ul.ie: Add stats to track how relevant the logic is]
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

For this to work with git-am, the From: line has to be _above_ the patch 
description (must be the first line of the mail even). AFAIK at least.

> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Mel Gorman <mel@....ul.ie>

Cheers,
FJP
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