From: John Levon <levon@movementarian.org>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Zwane Mwaikambo <zwane@holomorphy.com>,
Chris Wedgwood <cw@f00f.org>,
Kernel Mailing List <linux-kernel@vger.kernel.org>,
"Martin J. Bligh" <mbligh@aracnet.com>,
William Lee Irwin III <wli@holomorphy.com>
Subject: Re: doublefault debugging (was Re: Linux v2.5.62 --- spontaneous reboots)
Date: Thu, 20 Feb 2003 22:57:52 +0000 [thread overview]
Message-ID: <20030220225752.GB85293@compsoc.man.ac.uk> (raw)
In-Reply-To: <Pine.LNX.4.44.0302201428540.1159-100000@penguin.transmeta.com>
On Thu, Feb 20, 2003 at 02:32:02PM -0800, Linus Torvalds wrote:
> I think the _real_ simplification is to just have the task switch do this
> in the tail:
>
> if (prev->state & TASK_DEAD)
> put_task_struct(prev);
>
> suddenly we don't have any issues at all with possibly freeing stuff
> before its time, since we're guaranteed to keep the process around untill
> we've properly scheduled out of it.
Side note ... if there's a sleepable context in which oprofile can
synchronise its buffers (i.e. after the task can possible run on a CPU
again, and before the task_struct itself is freed/reused), that would be
very handy.
Currently we're masking out any samples when PF_EXITING is set for
current(), which is obviously less than ideal.
Would this be such a spot ? Basically somewhere that profile_exit_task
can sit.
regards
john
next prev parent reply other threads:[~2003-02-20 22:47 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.44.0302201830580.474-100000@localhost.localdomain>
2003-02-20 18:01 ` Linus Torvalds
2003-02-20 18:23 ` Linus Torvalds
2003-02-20 19:36 ` Ingo Molnar
2003-02-20 19:53 ` Ingo Molnar
2003-02-20 19:57 ` Ingo Molnar
2003-02-20 20:14 ` Ingo Molnar
2003-02-20 20:17 ` Linus Torvalds
2003-02-20 20:50 ` Andrew Morton
2003-02-20 22:04 ` Ingo Molnar
2003-02-20 22:42 ` William Lee Irwin III
2003-02-21 7:05 ` Ingo Molnar
2003-02-20 22:00 ` Ingo Molnar
2003-02-20 22:32 ` Linus Torvalds
2003-02-20 22:40 ` Linus Torvalds
2003-02-20 22:45 ` Linus Torvalds
2003-02-20 22:57 ` John Levon [this message]
2003-02-20 23:21 ` Ingo Molnar
2003-02-20 23:36 ` Linus Torvalds
2003-02-21 7:00 ` Ingo Molnar
2003-02-21 15:05 ` Linus Torvalds
2003-02-20 19:00 ` Ingo Molnar
2003-02-18 23:01 Linux v2.5.62 --- spontaneous reboots Chris Wedgwood
2003-02-19 23:35 ` doublefault debugging (was Re: Linux v2.5.62 --- spontaneous reboots) Linus Torvalds
2003-02-20 2:22 ` Zwane Mwaikambo
2003-02-20 2:26 ` William Lee Irwin III
2003-02-20 2:55 ` Zwane Mwaikambo
2003-02-20 3:15 ` William Lee Irwin III
2003-02-20 4:52 ` Linus Torvalds
2003-02-20 5:07 ` William Lee Irwin III
2003-02-20 6:05 ` Zwane Mwaikambo
2003-02-20 11:46 ` Ingo Molnar
2003-02-20 12:12 ` William Lee Irwin III
2003-02-20 12:33 ` Ingo Molnar
2003-02-20 14:03 ` Zwane Mwaikambo
2003-02-20 14:00 ` Zwane Mwaikambo
2003-02-20 15:43 ` Linus Torvalds
2003-02-20 15:52 ` Ingo Molnar
2003-02-20 16:11 ` Martin J. Bligh
2003-02-20 16:54 ` Linus Torvalds
2003-02-20 17:24 ` Jeff Garzik
2003-02-20 21:21 ` Alan Cox
2003-02-20 20:20 ` Linus Torvalds
2003-02-20 20:23 ` Martin J. Bligh
2003-02-20 20:42 ` William Lee Irwin III
2003-02-20 20:51 ` Linus Torvalds
2003-02-27 18:50 ` Randy.Dunlap
2003-02-27 19:39 ` Muli Ben-Yehuda
2003-02-27 19:47 ` Randy.Dunlap
2003-03-02 6:12 ` Keith Owens
2003-02-27 23:32 ` Randy.Dunlap
2003-02-20 23:09 ` Chris Wedgwood
2003-02-20 16:44 ` Ingo Molnar
2003-02-20 20:13 ` Chris Wedgwood
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