linux-kernel - Re: [PATCH 1/7] memcg: sc.nr_to

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Message-Id: <20100721223414.8713.A69D9226@jp.fujitsu.com>
Date:	Wed, 21 Jul 2010 22:34:23 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nishimura Daisuke <d-nishimura@....biglobe.ne.jp>
Subject: Re: [PATCH 1/7] memcg: sc.nr_to_reclaim should be initialized

> On Fri, Jul 16, 2010 at 07:13:31PM +0900, KOSAKI Motohiro wrote:
> > Currently, mem_cgroup_shrink_node_zone() initialize sc.nr_to_reclaim as 0.
> > It mean shrink_zone() only scan 32 pages and immediately return even if
> > it doesn't reclaim any pages.
> > 
> 
> Do you mean it immediately returns once one page is reclaimed? i.e. this
> check
> 
>                if (nr_reclaimed >= nr_to_reclaim && priority < DEF_PRIORITY)
>                         break;

Strictly speaking, once SWAP_CLUSTER_MAX batch is scanned. no need
to reclaim pages at all.



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