Date: Mon, 6 Feb 2006 13:54:27 -0600
From: "Serge E. Hallyn" <serue@us.ibm.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: linux-kernel@vger.kernel.org, vserver@list.linux-vserver.org,
       Herbert Poetzl <herbert@13thfloor.at>,
       "Serge E. Hallyn" <serue@us.ibm.com>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, Dave Hansen <haveblue@us.ibm.com>,
       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>,
       Kirill Korotaev <dev@sw.ru>, 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>
Subject: Re: [RFC][PATCH 01/20] pid: Intoduce the concept of a wid (wait id)
Message-ID: <20060206195427.GH11887@sergelap.austin.ibm.com>
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Quoting Eric W. Biederman (ebiederm@xmission.com):
> 
> The wait id is the pid returned by wait.  For tasks that span 2
> namespaces (i.e. the process leaders of the pid namespaces) their
> parent knows the task by a different PID value than the task knows
> itself. Having a child with PID == 1 would be confusing. 

Is it possible here to have wid conflicts?

Does that matter?

Looking at sysvinit, it seems that it does.  If the wid happens
to conflict with the pid of one of the children init knows about,
it could confuse init.

-serge
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