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Date: Mon, 14 Sep 2009 01:23:19 +0900
Message-ID: <2f11576a0909130923i3795a91bxd0cc0fe7b19a1e3b@mail.gmail.com>
Subject: Re: [RFC] respect the referenced bit of KVM guest pages?
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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To: "Dike, Jeffrey G" <jeffrey.g.dike@intel.com>
Cc: "Wu, Fengguang" <fengguang.wu@intel.com>, Johannes Weiner <hannes@cmpxchg.org>, Avi Kivity <avi@redhat.com>, Rik van Riel <riel@redhat.com>, Andrea Arcangeli <aarcange@redhat.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>
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Hi Jeff,

> A side note - I've been doing some tracing and shrink_active_list is call=
ed a humongous number of times (25000-ish during a ~90 kvm run), with a net=
 result of zero pages moved nearly all the time. =A0Your test is rescuing e=
ssentially all candidate pages from the inactive list. =A0Right now, I have=
 the VM_EXEC || PageAnon version of your test.

Sorry for the long delayed replay.
I made reproduce environment today. but I don't have luck. I didn't
reproduce stack refault issue.
Could you please explain detailed reproduce way and your analysis way?

My environment is,
  x86_64 CPUx4 MEM 6G
  userland: fedora11
  kernel: latest mmotm

  cgroup size: 128M
  guest mem: 256M
  CONFIG_KSM=3Dn

My result,
  - plenty anon and file fault happen. but it is ideal. it is caused
by demand paging.
  - do_anonymous_page almost doesn't handle stack fault. both host and gues=
t.

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