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

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Message-ID: <4AFDA724.7010200@redhat.com>
Date:	Fri, 13 Nov 2009 13:36:20 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Frans Pop <elendil@...net.nl>, 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>,
	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 11/13/2009 01:15 PM, 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.
>
>
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index 90b11e4..bc09547 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -685,6 +685,7 @@ static const char * const vmstat_text[] = {
>   	"kswapd_inodesteal",
>   	"kswapd_slept_prematurely_fast",
>   	"kswapd_slept_prematurely_slow",
> +	"kswapd_no_congestion_wait",
>   	
>    
Perhaps better named "kswapd_skip_congestion_wait" ?

Other than that, the patch looks good to me.

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

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