From: Andrew Jones <drjones@redhat.com>
To: Anton Blanchard <anton@samba.org>
Cc: uobergfe@redhat.com, dzickus@redhat.com,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: Confusing behaviour with /proc/sys/kernel/nmi_watchdog
Date: Wed, 5 Nov 2014 11:26:45 +0100 [thread overview]
Message-ID: <20141105102645.GA3046@hawk.usersys.redhat.com> (raw)
In-Reply-To: <20141105093420.1c7500d8@kryten>
On Wed, Nov 05, 2014 at 09:34:20AM +1100, Anton Blanchard wrote:
>
> Hi,
>
> commit 9919e39a1738 ("kvm: ensure hard lockup detection is disabled by
> default") provided a way for the kernel to disable the hard lockup
> detector at runtime.
>
> I'm using it on ppc64 but notice some weird behaviour with the
> nmi_watchdog procfs variable. At boot, that the hard lockup
> detector appears to be enabled even when we disable it via
> watchdog_enable_hardlockup_detector(false):
>
> # cat /proc/sys/kernel/nmi_watchdog
> 1
>
> I have to echo 0 to it then echo 1 again to enable it.
>
> Anton
Hi Anton,
Yes, the nmi watchdog proc variables are currently a bit
confusing. Uli has posted a series to clear all that up
though. Please see
https://lkml.org/lkml/2014/10/17/340
drew
next prev parent reply other threads:[~2014-11-05 10:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-04 22:34 Confusing behaviour with /proc/sys/kernel/nmi_watchdog Anton Blanchard
2014-11-05 10:26 ` Andrew Jones [this message]
2015-01-21 3:39 ` Anton Blanchard
2015-01-21 10:52 ` Andrew Jones
2015-01-21 14:30 ` Don Zickus
2014-11-05 14:53 ` Don Zickus
2014-11-05 18:53 ` Anton Blanchard
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