From: Thomas Gleixner <tglx@linutronix.de>
To: paulmck@us.ibm.com
Cc: George Anzinger <george@mvista.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, Steven Rostedt <rostdt@goodmis.org>,
Jeff Dike <jdike@addtoit.com>
Subject: Re: 2.6.13-rc6-rt9
Date: Fri, 30 Sep 2005 08:17:36 +0200 [thread overview]
Message-ID: <1128061056.15115.388.camel@tglx.tec.linutronix.de> (raw)
In-Reply-To: <20050930014636.GV8177@us.ibm.com>
On Thu, 2005-09-29 at 18:46 -0700, Paul E. McKenney wrote:
> > you are not the culprit :)
>
> Woo-hoo!!! Exonerated!!! This time, anyway... ;-)
My pleasure :)
> > It can not be run from hardirq context, as it takes a lot of locks
> > (especially our favorites: tasklist_lock and sighand->siglock). :(
> >
> > Maybe another playground for rcu, but it might also be solved by some
> > other mechanism for accounting and delayed execution in the PREEMPT_RT
> > case.
>
> Certainly check_thread_timers() and check_process_timers() are playing
> with a number of task_struct fields, so it is not immediately clear
> to me how to safely replace tasklist_lock with RCU, at least not with
> a simple and small patch.
>
> What did you have in mind for delayed execution?
Do only the time check in hard irq context and defer the lock protected
operations to a softirq context. Have to look deeper at the details
though.
tglx
next prev parent reply other threads:[~2005-09-30 6:16 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-18 6:01 2.6.13-rc6-rt9 Ingo Molnar
2005-08-18 15:24 ` 2.6.13-rc6-rt9 Thomas Gleixner
2005-08-18 16:08 ` 2.6.13-rc6-rt9 Thomas Gleixner
2005-08-18 21:17 ` 2.6.13-rc6-rt9 Thomas Gleixner
2005-08-18 22:54 ` [2.6.13-rc6-rt9 patch] fix DECNET_ROUTER=y compile Adrian Bunk
2005-08-22 7:59 ` Ingo Molnar
2005-08-18 22:54 ` 2.6.13-rc6-rt9: compile errors Adrian Bunk
2005-08-22 8:44 ` Ingo Molnar
2005-08-19 0:05 ` 2.6.13-rc6-rt9 Chuck Harding
2005-08-19 6:39 ` 2.6.13-rc6-rt9 Steven Rostedt
2005-08-19 13:00 ` 2.6.13-rc6-rt9 Steven Rostedt
2005-08-19 15:36 ` 2.6.13-rc6-rt9 Steven Rostedt
2005-08-22 7:57 ` 2.6.13-rc6-rt9 Ingo Molnar
2005-08-22 7:58 ` 2.6.13-rc6-rt9 Ingo Molnar
2005-08-23 12:36 ` 2.6.13-rc6-rt9 Ingo Molnar
2005-08-23 12:50 ` 2.6.13-rc6-rt9 Steven Rostedt
2005-08-23 12:56 ` 2.6.13-rc6-rt9 Ingo Molnar
2005-08-19 16:56 ` 2.6.13-rc6-rt9 Peter Zijlstra
2005-08-19 18:30 ` 2.6.13-rc6-rt9 Peter Zijlstra
2005-08-19 18:43 ` 2.6.13-rc6-rt9 Paul E. McKenney
2005-08-20 19:27 ` 2.6.13-rc6-rt9 Peter Zijlstra
2005-08-20 21:24 ` 2.6.13-rc6-rt9 Jeff Dike
2005-09-29 7:54 ` 2.6.13-rc6-rt9 Peter Zijlstra
2005-09-30 1:00 ` 2.6.13-rc6-rt9 Paul E. McKenney
2005-09-30 1:07 ` 2.6.13-rc6-rt9 Thomas Gleixner
2005-09-30 1:46 ` 2.6.13-rc6-rt9 Paul E. McKenney
2005-09-30 6:17 ` Thomas Gleixner [this message]
2005-08-19 21:50 ` 2.6.13-rc6-rt9 Darren Hart
2005-08-25 6:24 ` 2.6.13-rc6-rt9 Ingo Molnar
2005-08-19 22:13 ` 2.6.13-rc6-rt9 Darren Hart
2005-08-19 23:00 ` 2.6.13-rc6-rt9 Thomas Gleixner
2005-08-20 15:13 ` 2.6.13-rc6-rt9 Darren Hart
2005-08-19 23:48 ` [PATCH 2.6.13-rc6-rt9] PI aware dynamic priority adjustment Thomas Gleixner
2005-08-20 0:19 ` George Anzinger
2005-08-20 0:36 ` Thomas Gleixner
2005-08-20 1:36 ` George Anzinger
2005-09-26 21:03 ` Roland McGrath
2005-08-20 14:10 ` Oleg Nesterov
2005-08-20 16:04 ` Thomas Gleixner
2005-08-20 17:50 ` Oleg Nesterov
2005-08-22 21:37 ` George Anzinger
2005-08-20 16:58 ` [PATCH] fix send_sigqueue() vs thread exit race Oleg Nesterov
2005-08-21 9:44 ` Thomas Gleixner
2005-08-21 10:41 ` Oleg Nesterov
2005-08-21 12:38 ` Thomas Gleixner
2005-08-21 10:59 ` Oleg Nesterov
2005-08-21 21:24 ` Thomas Gleixner
2005-08-21 21:50 ` Thomas Gleixner
2005-08-22 6:39 ` Oleg Nesterov
2005-08-22 8:08 ` Thomas Gleixner
2005-08-22 8:52 ` Oleg Nesterov
2005-08-22 10:06 ` Thomas Gleixner
2005-08-22 16:45 ` Oleg Nesterov
2005-08-23 10:13 ` Thomas Gleixner
2005-08-23 16:17 ` Oleg Nesterov
2005-08-23 18:29 ` Thomas Gleixner
2005-09-24 13:42 ` [PATCH] fix exit_itimers() vs posix_timer_event() AB-BA deadlock Oleg Nesterov
2005-09-25 5:44 ` Andrew Morton
2005-09-25 14:07 ` [PATCH] fix exit_itimers() vs posix_timer_event() AB-BAdeadlock Oleg Nesterov
2005-10-23 16:50 ` Oleg Nesterov
2005-08-23 10:42 ` [PATCH] fix send_sigqueue() vs thread exit race Thomas Gleixner
2005-08-22 7:38 ` [PATCH 2.6.13-rc6-rt9] PI aware dynamic priority adjustment Ingo Molnar
2005-08-22 7:41 ` Ingo Molnar
2005-08-19 10:41 2.6.13-rc6-rt9 Karsten Wiese
2005-08-19 22:42 ` 2.6.13-rc6-rt9 Chuck Harding
2005-08-19 23:12 ` 2.6.13-rc6-rt9 Chuck Harding
2005-08-22 7:47 ` 2.6.13-rc6-rt9 Ingo Molnar
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