From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
Stefani Seibold <stefani@seibold.net>,
Dario Faggioli <raistlin@linux.it>,
Max Krasnyansky <maxk@qualcomm.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 6/6] sched: disabled rt-bandwidth by default
Date: Thu, 28 Aug 2008 14:00:53 +0200 [thread overview]
Message-ID: <1219924853.6443.18.camel@twins> (raw)
In-Reply-To: <20080828115035.GM26610@one.firstfloor.org>
On Thu, 2008-08-28 at 13:50 +0200, Andi Kleen wrote:
> On Thu, Aug 28, 2008 at 01:19:13PM +0200, Peter Zijlstra wrote:
> > On Thu, 2008-08-28 at 13:09 +0200, Andi Kleen wrote:
> > > > Even if the system has multiple CPUs, and even if just a single CPU is
> > > > fully utilized by an RT task, without the rt-limit the system will still
> > > > lock up in practice due to various other factors: workqueues and tasks
> > > > being 'stuck' on CPUs that host an RT hog.
> > >
> > > The load balancer will not notice that a particular CPU is busy
> > > with real time tasks?
> >
> > Not currently, working on that though.
>
> I wonder if it would make sense to break affinities in extreme case?
> With that even the workqueues would work again.
Then people can no longer assume stuff like queue_work_on() etc.. works.
Users of such code might depend on it actually running on the specified
cpu.
next prev parent reply other threads:[~2008-08-28 12:01 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-19 10:33 [PATCH 0/6] sched: rt-bandwidth fixes Peter Zijlstra
2008-08-19 10:33 ` [PATCH 1/6] sched: rt-bandwidth for user grouping interface Peter Zijlstra
2008-08-19 10:33 ` [PATCH 2/6] sched: rt-bandwidth accounting fix Peter Zijlstra
2008-08-19 18:33 ` Max Krasnyansky
2008-08-19 18:38 ` Peter Zijlstra
2008-08-19 10:33 ` [PATCH 3/6] sched: rt-bandwidth group disable fixes Peter Zijlstra
2008-08-19 10:33 ` [PATCH 4/6] sched: extract walk_tg_tree() Peter Zijlstra
2008-08-19 10:33 ` [PATCH 5/6] sched: rt-bandwidth fixes Peter Zijlstra
2008-08-19 10:33 ` [PATCH 6/6] sched: disabled rt-bandwidth by default Peter Zijlstra
2008-08-19 11:05 ` Ingo Molnar
2008-08-19 11:11 ` Ingo Molnar
2008-08-19 11:42 ` [PATCH] sched: extract walk_tg_tree(), fix Ingo Molnar
2008-08-19 11:17 ` [PATCH 6/6] sched: disabled rt-bandwidth by default Nick Piggin
2008-08-19 12:59 ` Ingo Molnar
2008-08-19 18:15 ` Max Krasnyansky
2008-08-20 11:56 ` Nick Piggin
2008-08-26 9:00 ` Nick Piggin
2008-08-26 9:30 ` Ingo Molnar
2008-08-26 9:44 ` Nick Piggin
2008-08-26 10:29 ` Ingo Molnar
2008-08-26 11:03 ` Nick Piggin
2008-08-26 9:54 ` Nick Piggin
2008-08-26 11:09 ` Thomas Gleixner
2008-08-26 11:27 ` Nick Piggin
2008-08-26 12:50 ` Theodore Tso
2008-08-26 13:31 ` Stefani Seibold
2008-08-26 17:55 ` Theodore Tso
2008-08-26 21:37 ` Thomas Gleixner
2008-08-26 22:49 ` Andi Kleen
2008-08-27 10:08 ` Nick Piggin
2008-08-28 10:54 ` Ingo Molnar
2008-08-28 11:09 ` Andi Kleen
2008-08-28 11:19 ` Peter Zijlstra
2008-08-28 11:28 ` Ingo Molnar
2008-08-28 11:50 ` Andi Kleen
2008-08-28 12:00 ` Peter Zijlstra [this message]
2008-08-28 12:14 ` Andi Kleen
2008-08-28 12:18 ` Nick Piggin
2008-08-28 16:19 ` Max Krasnyansky
2008-08-28 16:25 ` Ingo Molnar
2008-08-28 16:33 ` Andi Kleen
2008-08-28 12:03 ` Nick Piggin
2008-08-28 13:07 ` Ingo Molnar
2008-08-28 13:45 ` Nick Piggin
2008-08-28 12:29 ` Nick Piggin
2008-08-27 10:04 ` Nick Piggin
2008-08-26 13:47 ` Mark Hounschell
2008-08-26 23:00 ` Steven Rostedt
2008-08-27 18:55 ` Chris Friesen
2008-08-28 14:15 ` Steven Rostedt
2008-08-28 14:30 ` Ingo Molnar
2008-08-28 14:36 ` Nick Piggin
2008-08-28 15:12 ` Steven Rostedt
2008-08-28 15:34 ` Nick Piggin
2008-08-28 15:50 ` Steven Rostedt
2008-08-28 17:26 ` Linus Torvalds
2008-08-28 18:04 ` Steven Rostedt
2008-08-28 18:10 ` Darren Hart
2008-08-28 18:16 ` Mark Hounschell
2008-08-28 18:42 ` Linus Torvalds
2008-08-28 18:53 ` Steven Rostedt
2008-08-29 7:56 ` Mike Galbraith
2008-08-29 8:06 ` Peter Zijlstra
2008-08-29 8:47 ` Mike Galbraith
2008-08-28 19:39 ` Stefani Seibold
2008-08-28 20:53 ` Alan Cox
2008-08-30 6:33 ` Nick Piggin
2008-08-28 16:33 ` Max Krasnyansky
2008-08-28 17:22 ` John Kacur
2008-08-28 16:05 ` Peter Zijlstra
2008-08-28 16:15 ` Steven Rostedt
2008-08-28 16:29 ` Peter Zijlstra
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