Subject: Re: (pspace,pid) vs true pid virtualization
From: Dave Hansen <haveblue@us.ibm.com>
To: "Serge E. Hallyn" <serue@us.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>, Kirill Korotaev <dev@sw.ru>,
       linux-kernel@vger.kernel.org, vserver@list.linux-vserver.org,
       Herbert Poetzl <herbert@13thfloor.at>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Arjan van de Ven <arjan@infradead.org>,
       Suleiman Souhlal <ssouhlal@FreeBSD.org>,
       Hubertus Franke <frankeh@watson.ibm.com>,
       Cedric Le Goater <clg@fr.ibm.com>, Kyle Moffett <mrmacman_g4@mac.com>,
       Greg <gkurz@fr.ibm.com>, Linus Torvalds <torvalds@osdl.org>,
       Andrew Morton <akpm@osdl.org>, Greg KH <greg@kroah.com>,
       Rik van Riel <riel@redhat.com>, Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
       Andrey Savochkin <saw@sawoct.com>, Kirill Korotaev <dev@openvz.org>,
       Andi Kleen <ak@suse.de>,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Jeff Garzik <jgarzik@pobox.com>,
       Trond Myklebust <trond.myklebust@fys.uio.no>,
       Jes Sorensen <jes@sgi.com>
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Date: Thu, 16 Feb 2006 10:52:59 -0800
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On Thu, 2006-02-16 at 12:44 -0600, Serge E. Hallyn wrote:
> Now Dave and I were just talking about actually using the
> init process in a pspace to do administration from outside.
> For instance, the userspace code, in /sbin/pspaceinit, which
> runs as (pspace 2, pid 1), could open a pipe with it's parent
> (pspace1, pid 234).  pid 234 can then ask the init process to
> do things like list processes, kill a process, and maybe even
> recursively talk to the init process in pspace 3.

This would require a much smarter init, and that a child be nice,
cooperate and pass on what is requested of it if it's nested children
are to be killed.  If a child decided to be mean and ignore its parent's
requests, the parent can always just kill the child.

(Read the last sentence, and in case you're wondering, no I don't have
any children in real life)

-- Dave

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