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From: Anton Blanchard <anton@samba.org>
To: uobergfe@redhat.com, drjones@redhat.com, dzickus@redhat.com,
	akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Subject: Confusing behaviour with /proc/sys/kernel/nmi_watchdog
Date: Wed, 5 Nov 2014 09:34:20 +1100	[thread overview]
Message-ID: <20141105093420.1c7500d8@kryten> (raw)


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

             reply	other threads:[~2014-11-04 22:34 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-04 22:34 Anton Blanchard [this message]
2014-11-05 10:26 ` Confusing behaviour with /proc/sys/kernel/nmi_watchdog Andrew Jones
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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