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Re: nmi_watchdog fix for x86_64 to be more like i386

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From: Dave Jones <davej@...>
To: Arjan van de Ven <arjan@...>
Cc: Thomas Gleixner <tglx@...>, Andi Kleen <ak@...>, David Bahi <dbahi@...>, <linux-kernel@...>, <linux-rt-users@...>, Gregory Haskins <GHaskins@...>
Subject: Re: nmi_watchdog fix for x86_64 to be more like i386
Date: Monday, October 1, 2007 - 4:10 pm

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
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Messages in current thread:
nmi_watchdog fix for x86_64 to be more like i386, David Bahi, (Wed Sep 26, 2:03 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Andi Kleen, (Mon Oct 1, 1:36 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Thomas Gleixner, (Mon Oct 1, 2:54 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Andi Kleen, (Mon Oct 1, 3:16 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Thomas Gleixner, (Mon Oct 1, 3:27 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Arjan van de Ven, (Mon Oct 1, 3:56 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Thomas Gleixner, (Mon Oct 1, 5:17 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Andi Kleen, (Mon Oct 1, 5:41 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Thomas Gleixner, (Mon Oct 1, 5:58 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Andi Kleen, (Mon Oct 1, 6:07 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Thomas Gleixner, (Mon Oct 1, 6:47 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Andi Kleen, (Tue Oct 2, 1:51 am)
Re: nmi_watchdog fix for x86_64 to be more like i386, Thomas Gleixner, (Tue Oct 2, 2:18 am)
RE: nmi_watchdog fix for x86_64 to be more like i386, Pallipadi, Venkatesh, (Fri Oct 5, 12:37 am)
RE: nmi_watchdog fix for x86_64 to be more like i386, Thomas Gleixner, (Fri Oct 5, 4:37 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Mika Penttilä, (Tue Oct 2, 12:56 am)
Re: nmi_watchdog fix for x86_64 to be more like i386, Arjan van de Ven, (Tue Oct 2, 1:00 am)
Re: nmi_watchdog fix for x86_64 to be more like i386, Arjan van de Ven, (Mon Oct 1, 6:52 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Paul E. McKenney, (Mon Oct 1, 4:11 pm)
Re: nmi_watchdog fix for x86_64 to be more like i386, Dave Jones, (Mon Oct 1, 4:10 pm)