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

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Date:	Fri, 14 Aug 2009 10:16:26 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Rik van Riel <riel@...hat.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.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>
Subject: Re: [RFC] respect the referenced bit of KVM guest pages?

On 08/14/2009 12:16 AM, Johannes Weiner wrote:
>
>> - do not ignore the referenced bit
>> - if you see a run of N pages which all have the referenced bit set, do
>> swap one
>>
>>      
>
> But it also means destroying the LRU order.
>
>    

True, it would, but if we ignore the referenced bit, LRU order is really 
FIFO.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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