linux-kernel - Re: [PATCH 5/5] cgroup: introduce cgroup namespaces

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Message-ID: <CALCETrWXMMGzptvEu6TfzTjBou4t==W39_nNB5FJwSk2Zy8uCQ@mail.gmail.com>
Date:	Thu, 17 Jul 2014 12:57:03 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Aditya Kali <adityakali@...gle.com>
Cc:	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	cgroups@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH 5/5] cgroup: introduce cgroup namespaces

On Thu, Jul 17, 2014 at 12:52 PM, Aditya Kali <adityakali@...gle.com> wrote:
> Introduce the ability to create new cgroup namespace. The newly created
> cgroup namespace remembers the 'struct cgroup *root_cgrp' at the point
> of creation of the cgroup namespace. The task that creates the new
> cgroup namespace and all its future children will now be restricted only
> to the cgroup hierarchy under this root_cgrp. In the first version,
> setns() is not supported for cgroup namespaces.
> The main purpose of cgroup namespace is to virtualize the contents
> of /proc/self/cgroup file. Processes inside a cgroup namespace
> are only able to see paths relative to their namespace root.
> This allows container-tools (like libcontainer, lxc, lmctfy, etc.)
> to create completely virtualized containers without leaking system
> level cgroup hierarchy to the task.

What happens if someone moves a task in a cgroup namespace outside of
the namespace root cgroup?

--Andy
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