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

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Date:	Thu, 06 Aug 2009 13:14:09 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	"Dike, Jeffrey G" <jeffrey.g.dike@...el.com>,
	Rik van Riel <riel@...hat.com>,
	"Yu, Wilfred" <wilfred.yu@...el.com>,
	"Kleen, Andi" <andi.kleen@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	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 08/06/2009 12:59 PM, Wu Fengguang wrote:
>> Do we know for a fact that only stack pages suffer, or is it what has
>> been noticed?
>>      
>
> It shall be the first case: "These pages are nearly all stack pages.",
> Jeff said.
>    

Ok.  I can't explain it.  There's no special treatment for guest stack 
pages.  The accessed bit should be maintained for them exactly like all 
other pages.

Are they kernel-mode stack pages, or user-mode stack pages (the 
difference being that kernel mode stack pages are accessed through large 
ptes, whereas user mode stack pages are accessed through normal ptes).

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

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