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

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Date:	Wed, 29 Oct 2008 16:39:19 -0400
From:	Aristeu Rozanski <aris@...hat.com>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	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

> > > 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.
 
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