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Date: Sun, 16 Aug 2009 10:13:11 +0530
From: Balbir Singh <balbir@linux.vnet.ibm.com>
To: Rik van Riel <riel@redhat.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>, Avi Kivity <avi@redhat.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>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       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?
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* Rik van Riel <riel@redhat.com> [2009-08-15 23:56:39]:

> Wu Fengguang wrote:
>
>> Right, but I meant busty page allocations and accesses on them, which
>> can make a large continuous segment of referenced pages in LRU list,
>> say 50MB.  They may or may not be valuable as a whole, however a local
>> algorithm may keep the first 4MB and drop the remaining 46MB.
>
> I wonder if the problem is that we simply do not keep a large
> enough inactive list in Jeff's test.  If we do not, pages do
> not have a chance to be referenced again before the reclaim
> code comes in.
>
> The cgroup stats should show how many active anon and inactive
> anon pages there are in the cgroup.
>

Yes, we do show active and inactive anon pages in the mem cgroup
controller in the memory.stat file.


-- 
	Balbir