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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20081029203918.GN771@redhat.com>
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.
 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/