linux-kernel - Re: [PATCH 6/8] Stop reclaim quickly when the task reclaimed enough lots pages

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Date:	Tue, 15 Dec 2009 08:51:11 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com, lwoodman@...hat.com,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, minchan.kim@...il.com
Subject: Re: [PATCH 6/8] Stop reclaim quickly when the task reclaimed enough lots pages

> On 12/14/2009 07:31 AM, KOSAKI Motohiro wrote:
> >
> >  From latency view, There isn't any reason shrink_zones() continue to
> > reclaim another zone's page if the task reclaimed enough lots pages.
> 
> IIRC there is one reason - keeping equal pageout pressure
> between zones.
> 
> However, it may be enough if just kswapd keeps evening out
> the pressure, now that we limit the number of concurrent
> direct reclaimers in the system.
> 
> Since kswapd does not use shrink_zones ...

Sure. That's exactly my point.
plus, balance_pgdat() scan only one node. then zone balancing is
meaingfull. but shrink_zones() scan all zone in all node. we don't
need inter node balancing. it's vmscan's buisiness.


> > Signed-off-by: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> 
> Reviewed-by: Rik van Riel <riel@...hat.com>

Thanks.


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