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

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Message-ID: <9EECC02A4CC333418C00A85D21E89326B651C0BD@azsmsx502.amr.corp.intel.com>
Date:	Wed, 5 Aug 2009 09:12:39 -0700
From:	"Dike, Jeffrey G" <jeffrey.g.dike@...el.com>
To:	Andrea Arcangeli <aarcange@...hat.com>, Avi Kivity <avi@...hat.com>
CC:	"Wu, Fengguang" <fengguang.wu@...el.com>,
	Rik van Riel <riel@...hat.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?

> It can't distinguish. Besides the pages being refaulted (as minor
> faults) implies they weren't collected yet. So the fact they are
> allowed to stay on active list or not can't matter or alter the
> refaulting issue.

Sounds like there's some terminology confusion.  A refault is a page being discarded due to memory pressure and subsequently being faulted back in.  I was counting the number of faults between the discard and faulting back in for each affected page.  For a large number of predominately stack pages, that number was very small.

					Jeff
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