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

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Message-Id: <20090807120857.5BE2.A69D9226@jp.fujitsu.com>
Date:	Fri,  7 Aug 2009 12:11:06 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com, Avi Kivity <avi@...hat.com>,
	Wu Fengguang <fengguang.wu@...el.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>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC] respect the referenced bit of KVM guest pages?

(cc to memcg folks)

> Avi Kivity wrote:
> > On 08/06/2009 01:59 PM, Wu Fengguang wrote:
> 
> >> As a refinement, the static variable 'recent_all_referenced' could be
> >> moved to struct zone or made a per-cpu variable.
> > 
> > Definitely this should be made part of the zone structure, consider the 
> > original report where the problem occurs in a 128MB zone (where we can 
> > expect many pages to have their referenced bit set).
> 
> The problem did not occur in a 128MB zone, but in a 128MB cgroup.
> 
> Putting it in the zone means that the cgroup, which may have
> different behaviour from the rest of the zone, due to excessive
> memory pressure inside the cgroup, does not get the right
> statistics.

maybe, I heven't catch your point.

Current memcgroup logic also use recent_scan/recent_rotate statistics.
Isn't it enought?




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