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

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Date:	Sat, 14 Nov 2009 03:33:16 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	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

> @@ -2092,8 +2102,12 @@ loop_again:
>                 * OK, kswapd is getting into trouble.  Take a nap, then take
>                 * another pass across the zones.
>                 */
> -               if (total_scanned && priority < DEF_PRIORITY - 2)
> -                       congestion_wait(BLK_RW_ASYNC, HZ/10);
> +               if (total_scanned && (priority < DEF_PRIORITY - 2)) {
> +                       if (!has_under_min_watermark_zone)

if I am correct, we must to remove "!".


> +                               count_vm_event(KSWAPD_NO_CONGESTION_WAIT);
> +                       else
> +                               congestion_wait(BLK_RW_ASYNC, HZ/10);
> +               }
--
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