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Date: Sun, 16 Aug 2009 12:55:22 +0800
From: Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: [RFC] respect the referenced bit of KVM guest pages?
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To: Rik van Riel <riel@redhat.com>
Cc: 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>
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On Sun, Aug 16, 2009 at 11:56:39AM +0800, Rik van Riel wrote:
> 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.

Exactly, that's the case I call the list FIFO.

> The cgroup stats should show how many active anon and inactive
> anon pages there are in the cgroup.

Jeff, can you have a look at these stats? Thanks!

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