linux-kernel - Re: cgroup: status-quo and userland efforts

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Message-ID: <20130409194640.GK6186@mtj.dyndns.org>
Date:	Tue, 9 Apr 2013 12:46:40 -0700
From:	Tejun Heo <tj@...nel.org>
To:	"Daniel P. Berrange" <berrange@...hat.com>
Cc:	Li Zefan <lizefan@...wei.com>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	bsingharora@...il.com, dhaval.giani@...il.com,
	Kay Sievers <kay.sievers@...y.org>, jpoimboe@...hat.com,
	lpoetter@...hat.com, workman-devel@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: cgroup: status-quo and userland efforts

A bit of addition.

On Tue, Apr 09, 2013 at 12:38:51PM -0700, Tejun Heo wrote:
> > We need to make the distribute approach work in order to support
> > containers, which requiring them to have a back-channel open to
> > the host userspace. If we can do that, then we've solved the problem

Why is back-channel such a bad thing?  Even fully virtualized
environments do special things to communicate with the host (the whole
stack of virt drivers).  It is sub-optimal and pointless to make
everything completely transparent.  There's nothing wrong with the
basesystem knowing that they're inside a container or a virtualized
environment, so I don't understand why a back-channel is such a big
problem.

Thanks.

-- 
tejun
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