From: Ingo Molnar <mingo@elte.hu>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andi Kleen <andi@firstfloor.org>,
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 13:28:57 +0200 [thread overview]
Message-ID: <20080828112857.GA27534@elte.hu> (raw)
In-Reply-To: <1219922353.6443.14.camel@twins>
* Peter Zijlstra <a.p.zijlstra@chello.nl> 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.
yeah, that's nice - i tried the earlier iteration of your patch already.
It doesnt solve the UP case obviously, nor the case where all CPUs are
hogged by RT tasks, nor any other (or future) per CPU aspect of Linux
that we have in place currently.
Ingo
next prev parent reply other threads:[~2008-08-28 11:29 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 [this message]
2008-08-28 11:50 ` Andi Kleen
2008-08-28 12:00 ` Peter Zijlstra
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20080828112857.GA27534@elte.hu \
--to=mingo@elte.hu \
--cc=a.p.zijlstra@chello.nl \
--cc=andi@firstfloor.org \
--cc=linux-kernel@vger.kernel.org \
--cc=maxk@qualcomm.com \
--cc=nickpiggin@yahoo.com.au \
--cc=raistlin@linux.it \
--cc=stefani@seibold.net \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox