linux-kernel - Re: Transparent Hugepage Support #33

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Message-Id: <20101216101053.05cb1516.nishimura@mxp.nes.nec.co.jp>
Date:	Thu, 16 Dec 2010 10:10:53 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.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>,
	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>,
	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>,
	Miklos Szeredi <miklos@...redi.hu>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: Transparent Hugepage Support #33

Hi,

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

> On Wed, 15 Dec 2010 06:15:40 +0100
> Andrea Arcangeli <aarcange@...hat.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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