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

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Message-ID: <2f11576a0909130923i3795a91bxd0cc0fe7b19a1e3b@mail.gmail.com>
Date:	Mon, 14 Sep 2009 01:23:19 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Dike, Jeffrey G" <jeffrey.g.dike@...el.com>
Cc:	"Wu, Fengguang" <fengguang.wu@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Avi Kivity <avi@...hat.com>, Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.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?

Hi Jeff,

> A side note - I've been doing some tracing and shrink_active_list is called a humongous number of times (25000-ish during a ~90 kvm run), with a net result of zero pages moved nearly all the time.  Your test is rescuing essentially all candidate pages from the inactive list.  Right 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=n

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 guest.
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