linux-kernel - Re: CLONE_NEWIPC documentation

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Message-ID: <20081123224842.GD12687@hallyn.com>
Date:	Sun, 23 Nov 2008 16:48:42 -0600
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Kirill Korotaev <dev@...nvz.org>,
	Pavel Emelianov <xemul@...nvz.org>,
	Cedric Le Goater <clg@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>, linux-man@...r.kernel.org
Subject: Re: CLONE_NEWIPC documentation

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> > +This flag is intended for the implementation of control groups.
> 
> The above sentence is wrong.
> 
> +This flag is intended for the implementation of containers.
> 
> Would be correct.
> 
> Both control groups and namespaces feed into the user space container
> concept.  Control groups are multiprocess resource limits.
> Namespaces are affect the mapping from resource name to resource.
> 
> What is interesting is you can unshare a sysvipc namespace and still have
> sysvipc shared memory mapped from another sysvipc namespace.
> 
> This is something that needs to be watched for.

Oh, I see, so please disregard my last msg, it seems Eric was plenty
clear.

thanks,
-serge
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