linux-kernel - Re: [lxc-devel] CGroup Namespaces (v10)

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Message-ID: <20160226224727.GB24680@ubuntumail>
Date:	Fri, 26 Feb 2016 22:47:27 +0000
From:	Serge Hallyn <serge.hallyn@...ntu.com>
To:	Alban Crequy <alban.crequy@...il.com>
Cc:	LXC development mailing-list 
	<lxc-devel@...ts.linuxcontainers.org>,
	Linux API <linux-api@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	gregkh@...uxfoundation.org, Tejun Heo <tj@...nel.org>,
	cgroups@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [lxc-devel] CGroup Namespaces (v10)

Quoting Alban Crequy (alban.crequy@...il.com):
> Hi,
> 
> On 29 January 2016 at 09:54,  <serge.hallyn@...ntu.com> wrote:
> > Hi,
> >
> > following is a revised set of the CGroup Namespace patchset which Aditya
> > Kali has previously sent.  The code can also be found in the cgroupns.v10
> > branch of
> >
> > https://git.kernel.org/cgit/linux/kernel/git/sergeh/linux-security.git/
> >
> > To summarize the semantics:
> >
> > 1. CLONE_NEWCGROUP re-uses 0x02000000, which was previously CLONE_STOPPED
> 
> What's the best way for a userspace application to test at run-time
> whether the kernel supports cgroup namespaces? Would you recommend to
> test if the file /proc/self/ns/cgroup exists?

Yup.