linux-kernel - Re: [PATCH 1/2] NMI watchdog: add support to enable and disable IOAPIC NMI

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Message-Id: <20081029175001.d2f9db9e.randy.dunlap@oracle.com>
Date:	Wed, 29 Oct 2008 17:50:01 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Aristeu Rozanski <aris@...hat.com>
Cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 1/2] NMI watchdog: add support to enable and disable
 IOAPIC NMI

On Wed, 29 Oct 2008 16:39:19 -0400 Aristeu Rozanski wrote:

> > > > This patch adds support to enable/disable IOAPIC NMI watchdog in runtime via
> > > > procfs.
> > > 
> > > Some info on how to use this, what to write(?) to what file(?) in procfs
> > > would be Very Good to have.
> > 
> >  I gather this is an extension to the existing interface already covering 
> > the local APIC NMI watchdog, which surely ;) must have been documented at 
> > the time it was added.  If it wasn't, then we cannot require it now as a 
> > prerequisite to accept this patch, although such documentation would be 
> > desirable as a separate submission.
> What about (if OK, I'll resubmit in a different thread with proper format):
> 
> ---
>  Documentation/nmi_watchdog.txt |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> --- linus-2.6.orig/Documentation/nmi_watchdog.txt	2008-10-24 11:41:30.000000000 -0400
> +++ linus-2.6/Documentation/nmi_watchdog.txt	2008-10-29 16:38:12.000000000 -0400
> @@ -69,6 +69,11 @@ to the overall system performance.
>  On x86 nmi_watchdog is disabled by default so you have to enable it with
>  a boot time parameter.
>  
> +It's possible to disable the NMI watchdog in run-time by writing "0" to
> +/proc/sys/kernel/nmi_watchdog. Writing "1" to the same file will re-enable
> +the NMI watchdog. Notice that you still need to use "nmi_watchdog=" parameter
> +in boot time.
> +
>  NOTE: In kernels prior to 2.4.2-ac18 the NMI-oopser is enabled unconditionally
>  on x86 SMP boxes.

OK.  Or update Documentation/filesystems/proc.txt::nmi_watchdog
(now that I have found it).

---
~Randy
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