From: Dave Jones <davej@redhat.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, Andi Kleen <ak@suse.de>,
David Bahi <dbahi@novell.com>,
linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
Gregory Haskins <GHaskins@novell.com>
Subject: Re: nmi_watchdog fix for x86_64 to be more like i386
Date: Mon, 1 Oct 2007 16:10:46 -0400 [thread overview]
Message-ID: <20071001201046.GA7089@redhat.com> (raw)
In-Reply-To: <20071001125626.32eb6d0b@laptopd505.fenrus.org>
On Mon, Oct 01, 2007 at 12:56:26PM -0700, Arjan van de Ven wrote:
> On Mon, 1 Oct 2007 21:27:39 +0200 (CEST)
>
> > > I already did this here by checking for cpu != 0. But it also needs
> > > either tracking or forbidding migrations of irq 0. I can take care
> > > of the patch.
> >
> > I was thinking about the same fix. On i386 we already have the irq
> > migration / balancing of irq 0 disabled. That's why we setup IRQ0 with
> > IRQ_NOBALANCING.
>
> btw doing this is a problem if the user decides to hot(un)plug cpu 0...
> he then can't move the irqs away to do that
You can't hot unplug cpu0.
Take a look in sysfs, no /sys/devices/system/cpu/cpu0/online file.
Dave
--
http://www.codemonkey.org.uk
next prev parent reply other threads:[~2007-10-01 20:11 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-26 18:03 nmi_watchdog fix for x86_64 to be more like i386 David Bahi
2007-10-01 17:36 ` Andi Kleen
2007-10-01 18:54 ` Thomas Gleixner
2007-10-01 19:16 ` Andi Kleen
2007-10-01 19:27 ` Thomas Gleixner
2007-10-01 19:56 ` Arjan van de Ven
2007-10-01 20:10 ` Dave Jones [this message]
2007-10-01 20:11 ` Paul E. McKenney
2007-10-01 21:17 ` Thomas Gleixner
2007-10-01 21:41 ` Andi Kleen
2007-10-01 21:58 ` Thomas Gleixner
2007-10-01 22:07 ` Andi Kleen
2007-10-01 22:47 ` Thomas Gleixner
2007-10-01 22:52 ` Arjan van de Ven
2007-10-02 4:56 ` Mika Penttilä
2007-10-02 5:00 ` Arjan van de Ven
2007-10-02 5:51 ` Andi Kleen
2007-10-02 6:18 ` Thomas Gleixner
2007-10-05 4:37 ` Pallipadi, Venkatesh
2007-10-05 20:37 ` Thomas Gleixner
-- strict thread matches above, loose matches on Subject: below --
2007-10-05 16:01 David Bahi
2007-10-05 16:03 ` Andi Kleen
2007-10-05 17:38 ` Peter W. Morreale
2007-10-05 18:00 ` Andi Kleen
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