linux-kernel - Re: CGroup Namespaces (v4)

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Message-ID: <20151116223758.GM18894@mtj.duckdns.org>
Date:	Mon, 16 Nov 2015 17:37:58 -0500
From:	Tejun Heo <tj@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	Richard Weinberger <richard@....at>,
	Richard Weinberger <richard.weinberger@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"open list:ABI/API" <linux-api@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	LXC development mailing-list 
	<lxc-devel@...ts.linuxcontainers.org>,
	cgroups mailinglist <cgroups@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: CGroup Namespaces (v4)

Hello, Eric.

On Mon, Nov 16, 2015 at 04:24:27PM -0600, Eric W. Biederman wrote:
> Does this allow mixing of cgroupfs and cgroupfs2?  That is can I: "mount
> -t cgroupfs" inside a container and "mount -t cgroupfs2" outside a
> container? and still have reasonable things happen?  I suspect the
> semantics of cgroups prevent this but I am interested to know what happens.

cgroup v1 and v2 are just separate hierarchies.  They can't nest each
other but co-existing and namespacing on their own is completely fine.
The caveat is that a given controller can be on only one hierarchy but
that's the same among v1 hierarchies too.

Thanks.

-- 
tejun
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