linux-kernel - Re: [patch 2/2] mm: vmscan: drop nr_force_scan[] from get_scan

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Date:	Wed, 17 Aug 2011 10:12:49 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Johannes Weiner <jweiner@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.cz>,
	Ying Han <yinghan@...gle.com>,
	Balbir Singh <bsingharora@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [patch 2/2] mm: vmscan: drop nr_force_scan[] from
 get_scan_count

On Thu, 11 Aug 2011 22:31:55 +0200
Johannes Weiner <jweiner@...hat.com> wrote:

> The nr_force_scan[] tuple holds the effective scan numbers for anon
> and file pages in case the situation called for a forced scan and the
> regularly calculated scan numbers turned out zero.
> 
> However, the effective scan number can always be assumed to be
> SWAP_CLUSTER_MAX right before the division into anon and file.  The
> numerators and denominator are properly set up for all cases, be it
> force scan for just file, just anon, or both, to do the right thing.
> 
> Signed-off-by: Johannes Weiner <jweiner@...hat.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Cc: Michal Hocko <mhocko@...e.cz>
> Cc: Ying Han <yinghan@...gle.com>
> Cc: Balbir Singh <bsingharora@...il.com>
> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Cc: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
> Cc: Mel Gorman <mel@....ul.ie>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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