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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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