linux-kernel - Re: [RFC][BUGFIX][PATCH 0/2] transhuge-memcg: some fixes (Re: Transparent Hugepage Support #25)

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Message-Id: <20100618132817.657f69b9.nishimura@mxp.nes.nec.co.jp>
Date:	Fri, 18 Jun 2010 13:28:17 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Izik Eidus <ieidus@...hat.com>, Nick Piggin <npiggin@...e.de>,
	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>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>, Hugh Dickins <hughd@...gle.com>
Subject: Re: [RFC][BUGFIX][PATCH 0/2] transhuge-memcg: some fixes (Re:
 Transparent Hugepage Support #25)

On Fri, 18 Jun 2010 03:08:40 +0200, Andrea Arcangeli <aarcange@...hat.com> wrote:
> On Wed, Jun 02, 2010 at 02:44:38PM +0900, Daisuke Nishimura wrote:
> > These are trial patches to fix the problem(based on THP-25).
> > 
> > [1/2] is a simple bug fix, and can be folded into "memcg compound(commit d16259c1
> > at the http://git.kernel.org/?p=linux/kernel/git/andrea/aa.git)".
> > [2/2] is a main patch.
> > 
> > Unfortunately, there seems to be some problems left, so I'm digging it and
> > need more tests.
> > Any comments are welcome.
> 
> Both are included in -26, but like you said there are problems
> left... are you willing to fix those too?
Will do if necessary, but hmm, I heard from KAMEZAWA-san that he has already sent
some patches to fix the similar problems on RHEL6, and I prefer his fixes to mine.
Should I(or KAMEZAWA-san?) forward port his patches onto current aa.git ?

> There's some slight
> difference in the code here and there that makes the fixes not so
> portable across releases (uncharge as param of move_account which
> wasn't there before as an example...).
> 
Agreed. And I think you'll see some extra changes of memcg in 2.6.36...
Any way, I'll do some test in both RHEL6 and aa.git when I have a time,
and feel free to tell me if you have any troubles in back/forward porting
memcg's fixes.


Thanks,
Daisuke Nishimura.
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