From: Linus Torvalds <torvalds@linux-foundation.org>
To: Robin Holt <holt@sgi.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Jack Steiner <steiner@americas.sgi.com>
Subject: Re: init's children list is long and slows reaping children.
Date: Thu, 5 Apr 2007 13:57:59 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0704051352370.6730@woody.linux-foundation.org> (raw)
In-Reply-To: <20070405195118.GH22762@lnx-holt.americas.sgi.com>
On Thu, 5 Apr 2007, Robin Holt wrote:
>
> For testing, Jack Steiner create the following patch. All it does
> is moves tasks which are transitioning to the zombie state from where
> they are in the children list to the head of the list. In this way,
> they will be the first found and reaping does speed up. We will still
> do a full scan of the list once the rearranged tasks are all removed.
> This does not seem to be a significant problem.
I'd almost prefer to just put the zombie children on a separate list. I
wonder how painful that would be..
That would still make it expensive for people who use WUNTRACED to get
stopped children (since they'd have to look at all lists), but maybe
that's not a big deal.
Another thing we could do is to just make sure that kernel threads simply
don't end up as children of init. That whole thing is silly, they're
really not children of the user-space init anyway. Comments?
Linus
next prev parent reply other threads:[~2007-04-05 20:58 UTC|newest]
Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-05 19:51 Robin Holt
2007-04-05 20:57 ` Linus Torvalds [this message]
2007-04-06 0:51 ` Chris Snook
2007-04-06 1:03 ` Chris Snook
2007-04-06 1:29 ` Linus Torvalds
2007-04-06 2:15 ` Eric W. Biederman
2007-04-06 10:43 ` Robin Holt
2007-04-06 15:38 ` Eric W. Biederman
2007-04-06 16:31 ` Oleg Nesterov
2007-04-06 17:32 ` Ingo Molnar
2007-04-06 17:39 ` Roland Dreier
2007-04-06 18:04 ` Eric W. Biederman
2007-04-06 18:30 ` Eric W. Biederman
2007-04-06 19:18 ` [patch] sched: get rid of p->children use in show_task() Ingo Molnar
2007-04-06 19:22 ` Ingo Molnar
2007-04-10 13:48 ` init's children list is long and slows reaping children Ingo Molnar
2007-04-10 13:38 ` Oleg Nesterov
2007-04-10 15:00 ` Eric W. Biederman
2007-04-10 15:16 ` [PATCH] Only send pdeath_signal when getppid changes Eric W. Biederman
2007-04-10 16:37 ` Oleg Nesterov
2007-04-10 17:41 ` Eric W. Biederman
2007-04-10 17:48 ` Roland McGrath
2007-04-11 3:17 ` Albert Cahalan
2007-04-10 14:51 ` init's children list is long and slows reaping children Eric W. Biederman
2007-04-10 15:06 ` Ingo Molnar
2007-04-10 15:22 ` Eric W. Biederman
2007-04-10 15:53 ` Ingo Molnar
2007-04-10 16:17 ` Eric W. Biederman
2007-04-11 6:20 ` [patch] uninline remove/add_parent() APIs Ingo Molnar
2007-04-11 7:00 ` Eric W. Biederman
2007-04-11 22:06 ` Andrew Morton
2007-04-12 10:45 ` Eric W. Biederman
2007-04-12 22:50 ` Roland McGrath
2007-04-10 16:44 ` init's children list is long and slows reaping children Oleg Nesterov
2007-04-11 19:55 ` Bill Davidsen
2007-04-11 20:17 ` Eric W. Biederman
2007-04-11 21:24 ` Bill Davidsen
2007-04-11 20:19 ` Oleg Nesterov
2007-04-06 18:02 ` Eric W. Biederman
2007-04-06 18:21 ` Davide Libenzi
2007-04-06 18:56 ` Eric W. Biederman
2007-04-06 19:16 ` Davide Libenzi
2007-04-06 19:19 ` Ingo Molnar
2007-04-06 21:29 ` Davide Libenzi
2007-04-06 21:51 ` Linus Torvalds
2007-04-06 22:31 ` Davide Libenzi
2007-04-06 22:46 ` Linus Torvalds
2007-04-06 22:59 ` Davide Libenzi
2007-04-09 8:28 ` Ingo Molnar
2007-04-09 18:09 ` Bill Davidsen
2007-04-09 19:28 ` Kyle Moffett
2007-04-09 19:51 ` Linus Torvalds
2007-04-09 20:03 ` Davide Libenzi
2007-04-10 15:12 ` Bill Davidsen
2007-04-10 19:17 ` Davide Libenzi
2007-04-09 20:00 ` Eric W. Biederman
2007-04-06 16:41 ` Robin Holt
2007-04-09 17:37 ` Chris Snook
2007-04-06 18:05 ` Christoph Hellwig
2007-04-06 19:39 ` Eric W. Biederman
2007-04-06 22:38 ` Jeff Garzik
2007-04-06 22:51 ` Linus Torvalds
2007-04-06 23:37 ` Jeff Garzik
2007-04-11 7:28 ` Nick Piggin
2007-04-10 0:23 ` Andrew Morton
2007-04-10 0:48 ` Eric W. Biederman
2007-04-10 1:15 ` Andrew Morton
2007-04-10 6:53 ` Jeff Garzik
2007-04-10 9:42 ` Robin Holt
2007-04-10 1:59 ` Dave Jones
2007-04-10 2:30 ` Andrew Morton
2007-04-10 2:46 ` Linus Torvalds
2007-04-10 7:07 ` Jeff Garzik
2007-04-10 22:20 ` Ingo Oeser
2007-04-10 5:07 ` Alexey Dobriyan
2007-04-10 5:21 ` Dave Jones
2007-04-10 6:09 ` Torsten Kaiser
2007-04-10 7:08 ` Jeff Garzik
2007-04-10 7:05 ` Jeff Garzik
2007-04-10 7:37 ` Andrew Morton
2007-04-10 8:33 ` Jeff Garzik
2007-04-10 8:41 ` Andrew Morton
2007-04-10 8:48 ` Jeff Garzik
2007-04-10 22:35 ` Ingo Oeser
2007-04-10 16:35 ` Matt Mackall
2007-04-10 7:44 ` Russell King
2007-04-10 8:16 ` Jeff Garzik
2007-04-10 8:59 ` Ingo Molnar
2007-04-10 9:33 ` Jeff Garzik
2007-04-06 8:42 Oleg Nesterov
2007-04-06 9:10 ` Eric W. Biederman
2007-04-06 9:44 ` Oleg Nesterov
2007-04-06 15:45 ` Eric W. Biederman
2007-04-06 15:47 ` Oleg Nesterov
2007-04-06 17:16 ` Linus Torvalds
2007-04-06 17:27 ` Ingo Molnar
2007-04-06 17:31 ` Ingo Molnar
2007-04-06 17:34 ` Eric W. Biederman
2007-04-06 19:06 ` H. Peter Anvin
2007-04-06 19:15 ` Eric W. Biederman
2007-04-06 19:21 ` H. Peter Anvin
2007-04-06 21:04 ` Jeremy Fitzhardinge
2007-04-06 21:07 ` H. Peter Anvin
2007-04-06 19:36 ` Oleg Nesterov
2007-04-06 19:43 ` Ingo Molnar
2007-04-06 20:01 ` Oleg Nesterov
2007-04-06 20:21 ` Ingo Molnar
2007-04-06 19:47 ` Oleg Nesterov
2007-04-06 19:59 ` Eric W. Biederman
2007-04-07 20:31 ` Oleg Nesterov
2007-04-08 0:38 ` Eric W. Biederman
2007-04-08 15:46 ` Oleg Nesterov
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