linux-kernel - Re: [PATCHv3 8/8] cgroup: Add documentation for cgroup namespaces

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Date:	Wed, 11 Feb 2015 00:17:04 -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>,
	Linux API <linux-api@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	cgroups mailinglist <cgroups@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCHv3 8/8] cgroup: Add documentation for cgroup namespaces

Hey,

On Tue, Feb 10, 2015 at 11:02:40PM -0600, Eric W. Biederman wrote:
> A slightly off topic comment, for where this thread has gone but
> relevant if we are talking about cgroup namespaces.
> 
> If don't implement compatibility with existing userspace, they get a
> nack.  A backwards-incompatible change should figure out how to remove
> the need for any namespaces.
>
> Because that is what namespaces are about backwards compatibility.

Are you claiming that namespaces are soley about backwards
compatibility?  ie. to trick userland into scoping without letting it
notice?  That's a very restricted view and namespaces do provide
further isolation capabilties in addition to what can be achieved
otherwise and it is logical to collect simliar funtionalities there.

Thanks.

-- 
tejun
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