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

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Message-ID: <20090806095905.GA30410@localhost>
Date:	Thu, 6 Aug 2009 17:59:05 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Avi Kivity <avi@...hat.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 Thu, Aug 06, 2009 at 05:59:53PM +0800, Avi Kivity wrote:
> On 08/06/2009 12:35 PM, Wu Fengguang wrote:
> > On Thu, Aug 06, 2009 at 05:35:59PM +0800, Avi Kivity wrote:
> >    
> >> On 08/06/2009 12:25 PM, Wu Fengguang wrote:
> >>      
> >>>> So you're effectively running a 256M guest on a 128M host?
> >>>>
> >>>> Do cgroups have private active/inactive lists?
> >>>>
> >>>>          
> >>> Yes, and they reuse the same page reclaim routines with the global
> >>> LRU lists.
> >>>
> >>>        
> >> Then this looks like a bug in the shadow accessed bit handling.
> >>      
> >
> > Yes. One question is: why only stack pages hurts if it is a
> > general page reclaim problem?
> >    
> 
> 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.
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