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From: Aristeu Rozanski <aris@redhat.com>
To: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: Randy Dunlap <randy.dunlap@oracle.com>,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH 1/2] NMI watchdog: add support to enable and disable IOAPIC NMI
Date: Wed, 29 Oct 2008 16:39:19 -0400	[thread overview]
Message-ID: <20081029203918.GN771@redhat.com> (raw)
In-Reply-To: <alpine.LFD.1.10.0810291941510.13373@ftp.linux-mips.org>

> > > 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.
 

  reply	other threads:[~2008-10-29 20:38 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-27 16:42 [PATCH 0/2] IOAPIC NMI watchdog fixes Aristeu Rozanski
2008-10-27 16:42 ` [PATCH 1/2] NMI watchdog: add support to enable and disable IOAPIC NMI Aristeu Rozanski
2008-10-29 16:05   ` Randy Dunlap
2008-10-29 19:47     ` Maciej W. Rozycki
2008-10-29 20:39       ` Aristeu Rozanski [this message]
2008-10-30  0:50         ` Randy Dunlap
2008-10-27 16:42 ` [PATCH 2/2] NMI watchdog: disable NMIs on LVT0 in case NMI watchdog is not working Aristeu Rozanski
2008-10-27 16:58 ` [PATCH 0/2] IOAPIC NMI watchdog fixes Maciej W. Rozycki
2008-10-27 17:45   ` Ingo Molnar
2008-12-15 11:23   ` Aristeu Rozanski
2008-12-16 15:04     ` Maciej W. Rozycki

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