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Date: Fri, 14 Aug 2009 10:16:26 +0300
From: Avi Kivity <avi@redhat.com>
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To: Johannes Weiner <hannes@cmpxchg.org>
CC: Rik van Riel <riel@redhat.com>, Wu Fengguang <fengguang.wu@intel.com>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Andrea Arcangeli <aarcange@redhat.com>,
       "Dike, Jeffrey G" <jeffrey.g.dike@intel.com>,
       "Yu, Wilfred" <wilfred.yu@intel.com>,
       "Kleen, Andi" <andi.kleen@intel.com>,
       Hugh Dickins <hugh.dickins@tiscali.co.uk>,
       Andrew Morton <akpm@linux-foundation.org>,
       Christoph Lameter <cl@linux-foundation.org>, Mel Gorman <mel@csn.ul.ie>,
       LKML <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>
Subject: Re: [RFC] respect the referenced bit of KVM guest pages?
References: <20090806100824.GO23385@random.random> <4A7AD5DF.7090801@redhat.com> <20090807121443.5BE5.A69D9226@jp.fujitsu.com> <20090812074820.GA29631@localhost> <4A82D24D.6020402@redhat.com> <20090813010356.GA7619@localhost> <4A843565.3010104@redhat.com> <4A843B72.6030204@redhat.com> <4A843EAE.6070200@redhat.com> <4A846581.2020304@redhat.com> <20090813211626.GA28274@cmpxchg.org>
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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.