linux-kernel - Re: [PATCH -mmotm 3/3] memcg: dirty pages instrumentation

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Message-Id: <20100302171214.99f9c73d.nishimura@mxp.nes.nec.co.jp>
Date:	Tue, 2 Mar 2010 17:12:14 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	Andrea Righi <arighi@...eler.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Greg Thelen <gthelen@...gle.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Andrew Morton <akpm@...ux-foundation.org>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH -mmotm 3/3] memcg: dirty pages instrumentation

On Tue, 2 Mar 2010 09:01:58 +0100, Andrea Righi <arighi@...eler.com> wrote:
> On Tue, Mar 02, 2010 at 09:23:09AM +0900, KAMEZAWA Hiroyuki wrote:
> > On Mon,  1 Mar 2010 22:23:40 +0100
> > Andrea Righi <arighi@...eler.com> wrote:
> > 
> > > Apply the cgroup dirty pages accounting and limiting infrastructure to
> > > the opportune kernel functions.
> > > 
> > > Signed-off-by: Andrea Righi <arighi@...eler.com>
> > 
> > Seems nice.
> > 
> > Hmm. the last problem is moving account between memcg.
> > 
> > Right ?
> 
> Correct. This was actually the last item of the TODO list. Anyway, I'm
> still considering if it's correct to move dirty pages when a task is
> migrated from a cgroup to another. Currently, dirty pages just remain in
> the original cgroup and are flushed depending on the original cgroup
> settings. That is not totally wrong... at least moving the dirty pages
> between memcgs should be optional (move_charge_at_immigrate?).
> 
FYI, I'm planning to add file-cache and shmem/tmpfs support for move_charge feature
for 2.6.35.
But, hmm, it would be complicated if we try to move dirty account too.


Thanks,
Daisuke Nishimura.
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