linux-kernel - Re: [PATCH 00 of 66] Transparent Hugepage Support #32

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Message-ID: <2080208615.1392881288860072684.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
Date:	Thu, 4 Nov 2010 04:41:12 -0400 (EDT)
From:	CAI Qian <caiqian@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>, Adam Litke <agl@...ibm.com>,
	Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00 of 66] Transparent Hugepage Support #32

Thank Andrea for pointing out to me there are ongoing works for KSM and THP integration. Sorry for the noise.

CAI Qian

----- caiqian@...hat.com wrote:

> There were some changes of behaviours with THP and KSM statistics
> demonstrated by this program, http://people.redhat.com/qcai/ksm01.c.
> 
> There are 3 programs (A, B ,C) to allocate 128M memory each using KSM.
> A has memory content = 'c'.
> B has memory content = 'a'.
> C has memory content = 'a'.
> Then without THP,
> pages_shared = 2
> pages_sharing = 98285
> pages_sharing = 98292
> pages_unshared = 0
> pages_volatile = 17
> pages_to_scan = 98304
> sleep_millisecs = 0
> with THP,
> pages_shared is 2.
> pages_sharing is 18422.
> pages_unshared is 0.
> pages_volatile is 8.
> 
> Later,
> A has memory content = 'c'
> B has memory content = 'b'
> C has memory content = 'a'.
> Then without THP,
> pages_shared = 3
> pages_sharing = 98296
> pages_unshared = 0
> pages_volatile = 5
> with THP,
> pages_shared = 3
> pages_sharing = 16358
> pages_unshared = 0
> pages_volatile = 23
> 
> Later,
> A has memory content = 'd'
> B has memory content = 'd'
> C has memory content = 'd'
> Then without THP,
> pages_shared = 1
> pages_sharing = 98274
> pages_unshared = 0
> pages_volatile = 29
> with THP,
> pages_shared = 1
> pages_sharing = 8668
> pages_unshared = 0
> pages_volatile = 35
> 
> Finally,
> A changes one page to 'e'
> Then without THP,
> pages_shared = 1
> pages_sharing = 98274
> pages_unshared = 1
> pages_volatile = 28
> with THP,
> pages_shared = 1
> pages_sharing = 8163
> pages_unshared = 1
> pages_volatile = 27
> 
> Are those differences for pages_sharing between with and without THP
> are expected?
> 
> CAI Qian
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