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

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Date:	Fri, 14 Aug 2009 18:37:22 -0400
From:	Rik van Riel <riel@...hat.com>
To:	"Dike, Jeffrey G" <jeffrey.g.dike@...el.com>
CC:	"Wu, Fengguang" <fengguang.wu@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Avi Kivity <avi@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...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>,
	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?

Dike, Jeffrey G wrote:
> A side note - I've been doing some tracing and shrink_active_list is called a humongous number of times (25000-ish during a ~90 kvm run), with a net result of zero pages moved nearly all the time.  Your test is rescuing essentially all candidate pages from the inactive list.  Right now, I have the VM_EXEC || PageAnon version of your test.

That is exactly why the the split LRU VM does an unconditional
deactivation of active anon pages :)

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