Messages in this thread Patch in this message |  | | | Date | Wed, 29 Oct 2008 16:39:19 -0400 | | From | Aristeu Rozanski <> | | Subject | Re: [PATCH 1/2] NMI watchdog: add support to enable and disable IOAPIC NMI |
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> > > 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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