Date: Thu, 4 Nov 2010 04:41:12 -0400 (EDT)
From: CAI Qian <caiqian@redhat.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>, Adam Litke <agl@us.ibm.com>,
        Avi Kivity <avi@redhat.com>, Hugh Dickins <hugh.dickins@tiscali.co.uk>,
        Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>,
        Dave Hansen <dave@linux.vnet.ibm.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Ingo Molnar <mingo@elte.hu>, Mike Travis <travis@sgi.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        Christoph Lameter <cl@linux-foundation.org>,
        Chris Wright <chrisw@sous-sol.org>, bpicco@redhat.com,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Balbir Singh <balbir@linux.vnet.ibm.com>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>,
        Chris Mason <chris.mason@oracle.com>, Borislav Petkov <bp@alien8.de>,
        linux-mm@kvack.org, Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org
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Thank Andrea for pointing out to me there are ongoing works for KSM and THP integration. Sorry for the noise.

CAI Qian

----- caiqian@redhat.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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