Date: Thu, 16 Dec 2010 10:10:53 +0900
From: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>, linux-mm@kvack.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, 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>,
        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>,
        Chris Mason <chris.mason@oracle.com>, Borislav Petkov <bp@alien8.de>,
        Miklos Szeredi <miklos@szeredi.hu>,
        Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Subject: Re: Transparent Hugepage Support #33
Message-Id: <20101216101053.05cb1516.nishimura@mxp.nes.nec.co.jp>
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	<20101216095408.3a60cbad.kamezawa.hiroyu@jp.fujitsu.com>
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Hi,

On Thu, 16 Dec 2010 09:54:08 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

> On Wed, 15 Dec 2010 06:15:40 +0100
> Andrea Arcangeli <aarcange@redhat.com> wrote:
> 
> > Some of some relevant user of the project:
> > 
> > KVM Virtualization
> > GCC (kernel build included, requires a few liner patch to enable)
> > JVM
> > VMware Workstation
> > HPC
> > 
> > It would be great if it could go in -mm.
> 
> Things should be done in memory cgroup is
>  
>  - make accounting correct (RSS count will be broken)
>  - make move_charge() to work
>    (at rmdir(), this is now broken. It seems move-charge-at-task-move to work)
> 
Yes.
I think we should add mem_cgroup_split_hugepage_commit() and add PageTransHuge()
check in mem_cgroup_move_parent() as done in RHEL6 kernel.
As for move-charge-at-task-move, it will work because walk_pmd_range() splits
THP pages(it would be better to change move-charge not to split THP pages, but
it's not so urgent IMHO).

> Do you have known other viewpoints ?
Not yet, but I'll test and check.

> I'll look into when -mm is shipped.
> 
me too :)


Thanks,
Daisuke Nihimura.
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