Date: Mon, 27 Apr 2009 09:03:32 -0400
From: Mike Snitzer <snitzer@redhat.com>
To: Ryo Tsuruta <ryov@valinux.co.jp>
Cc: dm-devel@redhat.com, vgoyal@redhat.com, fernando@oss.ntt.co.jp,
       linux-kernel@vger.kernel.org, jmoyer@redhat.com, jens.axboe@oracle.com,
       nauman@google.com, agk@redhat.com, balbir@linux.vnet.ibm.com
Subject: Re: dm-ioband: Test results.
Message-ID: <20090427130331.GB3872@redhat.com>
References: <20090421141607.GA22619@redhat.com> <20090422.121443.104042516.ryov@valinux.co.jp> <20090422151805.GC32602@redhat.com> <20090427.193006.112614137.ryov@valinux.co.jp>
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On Mon, Apr 27 2009 at  6:30am -0400,
Ryo Tsuruta <ryov@valinux.co.jp> wrote:

> Hi Mike,
> 
> > Why is it that you repeatedly ignore concern/discussion about your
> > determination to continue using a custom grouping mechanism?  It is this
> > type of excess layering that serves no purpose other than to facilitate
> > out-of-tree use-cases.  dm-ioband would take a big step closer to being
> > merged upstream if you took others' feedback and showed more willingness
> > to work through the outstanding issues.
> 
> I think dm-ioband's approach is one simple way to handle cgroup
> because the current cgroup has no way to manage kernel module's
> resources. Please tell me if you have any good ideas to handle 
> cgroup by dm-ioband.

If you'd like to keep dm-ioband modular then I'd say the appropriate
cgroup interfaces need to be exposed for module use (symbols exported,
etc).  No other controller has had a need to be modular but if you think
it is requirement for dm-ioband (facilitate updates, etc) then I have to
believe it is doable.

Mike
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