linux-kernel - Re: [RFD] cgroup: about multiple hierarchies

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Date:	Thu, 23 Feb 2012 15:32:41 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Tejun Heo <tj@...nel.org>, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Lennart Poettering <lennart@...ttering.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFD] cgroup: about multiple hierarchies

On Thu, Feb 23, 2012 at 03:59:44PM +0800, Li Zefan wrote:
> > Trying to make all the controllers uniform in terms of their treatment
> > of cgroup hiearchy sounds like a good thing to do.
> 
> Agreed.
> 
> Apart from nesting cgroups, there're other inconsistencies.
> 
> - Some controllers disallow more than one cgroup layer. That's the new
> net_prio controller, and I don't know why it's made so, but I guess
> it's fine to eliminate this restriction.

You mean don't allow creating deeper levels in cgroup hierarcy? That will
fail with libvirt + systemd as they create much deeper levels. I had to
change that for blkio.

> 
> - Some controllers move resource charges when a task is moved to
> a different cgroup, but some don't?

I think in case of some controllers it does not even apply. For cpu, blkio
resources are renewable, so there is no moving around of charges.

Thanks
Vivek
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