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

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Message-ID: <4A878377.70502@redhat.com>
Date:	Sat, 15 Aug 2009 23:56:39 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	Avi Kivity <avi@...hat.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>,
	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?

Wu Fengguang wrote:

> Right, but I meant busty page allocations and accesses on them, which
> can make a large continuous segment of referenced pages in LRU list,
> say 50MB.  They may or may not be valuable as a whole, however a local
> algorithm may keep the first 4MB and drop the remaining 46MB.

I wonder if the problem is that we simply do not keep a large
enough inactive list in Jeff's test.  If we do not, pages do
not have a chance to be referenced again before the reclaim
code comes in.

The cgroup stats should show how many active anon and inactive
anon pages there are in the cgroup.

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