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Message-ID: <4A79A743.6020209@redhat.com>
Date: Wed, 05 Aug 2009 18:37:39 +0300
From: Avi Kivity <avi@...hat.com>
To: Rik van Riel <riel@...hat.com>
CC: Wu Fengguang <fengguang.wu@...el.com>,
"Dike, Jeffrey G" <jeffrey.g.dike@...el.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>, KVM list <kvm@...r.kernel.org>
Subject: Re: [RFC] respect the referenced bit of KVM guest pages?
On 08/05/2009 05:33 PM, Rik van Riel wrote:
> Avi Kivity wrote:
>
>> The attached patch implements this.
>
> The attached page requires each page to go around twice
> before it is evicted, but they will still get evicted in
> the order in which they were made present.
>
> FIFO page replacement was shown to be a bad idea in the
> 1960's and it is still a terrible idea today.
>
Which is why we have accessed bits in page tables... but emulating the
accessed bit via RWX (note no present bit in EPT) is better than
ignoring it.
--
error compiling committee.c: too many arguments to function
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