From: ebiederm@xmission.com (Eric W. Biederman)
To: "Serge E. Hallyn" <serue@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, vserver@list.linux-vserver.org,
Herbert Poetzl <herbert@13thfloor.at>,
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)
Date: Mon, 06 Feb 2006 13:23:48 -0700 [thread overview]
Message-ID: <m13biwjkx7.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <20060206195427.GH11887@sergelap.austin.ibm.com> (Serge E. Hallyn's message of "Mon, 6 Feb 2006 13:54:27 -0600")
"Serge E. Hallyn" <serue@us.ibm.com> writes:
> 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.
No. The wid is in the pspace of the parent, and the pid is in the processes
pspace. Add is in any pspace are unique.
Eric
next prev parent reply other threads:[~2006-02-06 20:31 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-06 19:19 [RFC][PATCH 0/20] Multiple instances of the process id namespace Eric W. Biederman
2006-02-06 19:22 ` [RFC][PATCH 01/20] pid: Intoduce the concept of a wid (wait id) Eric W. Biederman
2006-02-06 19:27 ` [RFC][PATCH 02/20] pspace: The parent process id of pid 1 is always 0 Eric W. Biederman
2006-02-06 19:29 ` [RFC][PATCH 03/20] pid: Introduce a generic helper to test for init Eric W. Biederman
2006-02-06 19:34 ` [RFC][PATCH 04/20] pspace: Allow multiple instaces of the process id namespace Eric W. Biederman
2006-02-06 19:36 ` [RFC][PATCH 05/20] sched: Fixup the scheduler syscalls to deal with pspaces Eric W. Biederman
2006-02-06 19:39 ` [RFC][PATCH 06/20] cad_pid: Fixup the cad_pid users to assume it is in the initial process id namespace Eric W. Biederman
2006-02-06 19:41 ` [RFC][PATCH 07/20] tty: Update the tty layer to work with pspaces Eric W. Biederman
2006-02-06 19:44 ` [RFC][PATCH 08/20] vt: Update the virtual console to handle pspaces Eric W. Biederman
2006-02-06 19:46 ` [RFC][PATCH 09/20] ptrace: Update ptrace " Eric W. Biederman
2006-02-06 19:49 ` [RFC][PATCH 10/20] capabilities: Update the capabilities code to " Eric W. Biederman
2006-02-06 19:51 ` [RFC][PATCH 11/20] ioprio: Update ioprio " Eric W. Biederman
2006-02-06 19:54 ` [RFC][PATCH 12/20] fcntl: Update fcntl to work with pspaces Eric W. Biederman
2006-02-06 19:57 ` [RFC][PATCH 13/20] kthread: Update kthread " Eric W. Biederman
2006-02-06 19:59 ` [RFC][PATCH 14/20] mm: Update vmscan " Eric W. Biederman
2006-02-06 20:00 ` [RFC][PATCH 15/20] posix-timers: Update posix timers " Eric W. Biederman
2006-02-06 20:02 ` [PATCH 16/20] nfs: Don't use pids to track the lockd server process Eric W. Biederman
2006-02-06 20:03 ` [RFC][PATCH 17/20] usb: Fixup usb so it works with pspaces Eric W. Biederman
2006-02-06 20:05 ` [RFC][PATCH 18/20] posix-mqueue: Make mqueues work with pspspaces Eric W. Biederman
2006-02-06 20:07 ` [RFC][PATCH 19/20] pspace: Upcate the pid_max sysctl to work in a per pspace fashion Eric W. Biederman
2006-02-06 20:12 ` [RFC][PATCH 20/20] proc: Update /proc to support multiple pid spaces Eric W. Biederman
2006-02-10 20:40 ` Kirill Korotaev
2006-02-11 10:10 ` Eric W. Biederman
2006-02-06 20:41 ` [RFC][PATCH 17/20] usb: Fixup usb so it works with pspaces Serge E. Hallyn
2006-02-06 20:53 ` Eric W. Biederman
2006-02-07 16:41 ` [RFC][PATCH 04/20] pspace: Allow multiple instaces of the process id namespace William Lee Irwin III
2006-02-07 17:05 ` Eric W. Biederman
2006-02-10 20:30 ` Kirill Korotaev
2006-02-11 9:42 ` Eric W. Biederman
2006-02-11 10:11 ` Eric W. Biederman
2006-02-11 10:43 ` Eric W. Biederman
2006-02-13 8:53 ` Kirill Korotaev
2006-02-13 16:40 ` Dave Hansen
2006-02-11 11:03 ` Eric W. Biederman
2006-02-13 9:02 ` Kirill Korotaev
2006-02-13 21:31 ` Serge E. Hallyn
2006-02-13 23:41 ` Eric W. Biederman
2006-02-11 11:57 ` Eric W. Biederman
2006-02-13 9:22 ` Kirill Korotaev
2006-02-13 17:02 ` Serge E. Hallyn
2006-02-14 5:59 ` Eric W. Biederman
2006-02-14 5:54 ` Eric W. Biederman
2006-02-14 18:45 ` Dave Hansen
2006-02-15 12:07 ` Kirill Korotaev
2006-02-15 13:31 ` Herbert Poetzl
2006-02-16 13:44 ` Serge E. Hallyn
2006-02-20 9:27 ` Kirill Korotaev
2006-02-20 17:04 ` Herbert Poetzl
2006-02-21 16:29 ` Kirill Korotaev
2006-02-21 23:23 ` Herbert Poetzl
2006-02-20 11:29 ` Kirill Korotaev
2006-02-20 12:34 ` Herbert Poetzl
2006-02-20 14:11 ` Kirill Korotaev
2006-02-20 15:08 ` Herbert Poetzl
2006-03-01 22:06 ` Cedric Le Goater
2006-02-15 18:40 ` Eric W. Biederman
2006-02-06 19:56 ` [RFC][PATCH 03/20] pid: Introduce a generic helper to test for init Dave Hansen
2006-02-06 20:22 ` Eric W. Biederman
2006-02-07 15:08 ` Geert Uytterhoeven
2006-02-07 15:17 ` Eric W. Biederman
2006-02-06 19:54 ` [RFC][PATCH 01/20] pid: Intoduce the concept of a wid (wait id) Serge E. Hallyn
2006-02-06 20:23 ` Eric W. Biederman [this message]
2006-02-07 17:39 ` Jeff Dike
2006-02-07 18:32 ` Eric W. Biederman
2006-02-10 18:51 ` Kirill Korotaev
2006-02-11 9:25 ` Eric W. Biederman
2006-02-13 8:43 ` Kirill Korotaev
2006-02-14 0:04 ` Eric W. Biederman
2006-02-06 20:40 ` [RFC][PATCH 0/20] Multiple instances of the process id namespace Hubertus Franke
2006-02-06 20:51 ` Eric W. Biederman
2006-02-06 21:07 ` Hubertus Franke
2006-02-06 21:56 ` Eric W. Biederman
2006-02-07 0:48 ` Dave Hansen
2006-02-07 5:14 ` Eric W. Biederman
2006-02-07 9:33 ` Andi Kleen
2006-02-08 4:19 ` Randy.Dunlap
2006-02-08 4:28 ` Eric W. Biederman
2006-02-08 4:51 ` Randy.Dunlap
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