linux-kernel - Re: [PATCH 5/5] vmscan: Take order into consideration when deciding if kswapd is in trouble

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Date:	Fri, 13 Nov 2009 21:41:33 +0900
From:	Minchan Kim <minchan.kim@...il.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>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	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 5/5] vmscan: Take order into consideration when deciding 
	if kswapd is in trouble

On Fri, Nov 13, 2009 at 4:30 AM, Mel Gorman <mel@....ul.ie> wrote:
> If reclaim fails to make sufficient progress, the priority is raised.
> Once the priority is higher, kswapd starts waiting on congestion.
> However, on systems with large numbers of high-order atomics due to
> crappy network cards, it's important that kswapd keep working in
> parallel to save their sorry ass.
>
> This patch takes into account the order kswapd is reclaiming at before
> waiting on congestion. The higher the order, the longer it is before
> kswapd considers itself to be in trouble. The impact is that kswapd
> works harder in parallel rather than depending on direct reclaimers or
> atomic allocations to fail.
>
> Signed-off-by: Mel Gorman <mel@....ul.ie>

It's make sense to me.
It can help high order atomic allocation which is a big problem of allocator. :)

Thanks Mel.

Reviewed-by: Minchan Kim <minchan.kim@...il.com>

-- 
Kind regards,
Minchan Kim
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