linux-kernel - Re: [RFC] respect the referenced bit of KVM guest pages?

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Message-ID: <4A843B72.6030204@redhat.com>
Date:	Thu, 13 Aug 2009 19:12:34 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Rik van Riel <riel@...hat.com>
CC:	Wu Fengguang <fengguang.wu@...el.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	"Dike, Jeffrey G" <jeffrey.g.dike@...el.com>,
	"Yu, Wilfred" <wilfred.yu@...el.com>,
	"Kleen, Andi" <andi.kleen@...el.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC] respect the referenced bit of KVM guest pages?

On 08/13/2009 06:46 PM, Rik van Riel wrote:
> We need to ignore the referenced bit on active anon pages
> on very large systems, but it could indeed be helpful to
> respect the referenced bit on smaller systems.
>
> I have no idea where the cut-off between them would be.
>
> Maybe at inactive_ratio <= 4 ?

Why do we need to ignore the referenced bit in such cases?  To avoid 
overscanning?

-- 
error compiling committee.c: too many arguments to function

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