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watchdog/core: Add watchdog_thresh command line parameter

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The hard and soft lockup detector threshold has a default value of 10
seconds which can only be changed via sysctl.

During early boot lockup detection can trigger when noisy debugging emits
a large amount of messages to the console, but there is no way to set a
larger threshold on the kernel command line. The detector can only be
completely disabled.

Add a new watchdog_thresh= command line parameter to allow boot time
control over the threshold. It works in the same way as the sysctl and
affects both the soft and the hard lockup detectors.

Signed-off-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: rdunlap@infradead.org
Cc: prarit@redhat.com
Link: https://lkml.kernel.org/r/1541079018-13953-1-git-send-email-loberman@redhat.com
This commit is contained in:
Laurence Oberman 2018-11-01 09:30:18 -04:00 committed by Thomas Gleixner
parent 5b7449810a
commit 1129505552
2 changed files with 15 additions and 0 deletions
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8
Documentation/admin-guide/kernel-parameters.txt
View File

@ -4957,6 +4957,14 @@
or other driver-specific files in the
Documentation/watchdog/ directory.
watchdog_thresh=
[KNL]
Set the hard lockup detector stall duration
threshold in seconds. The soft lockup detector
threshold is set to twice the value. A value of 0
disables both lockup detectors. Default is 10
seconds.
workqueue.watchdog_thresh=
If CONFIG_WQ_WATCHDOG is configured, workqueue can
warn stall conditions and dump internal state to

7
kernel/watchdog.c
View File

@ -199,6 +199,13 @@ static int __init nosoftlockup_setup(char *str)
}
__setup("nosoftlockup", nosoftlockup_setup);
static int __init watchdog_thresh_setup(char *str)
{
get_option(&str, &watchdog_thresh);
return 1;
}
__setup("watchdog_thresh=", watchdog_thresh_setup);
#ifdef CONFIG_SMP
int __read_mostly sysctl_softlockup_all_cpu_backtrace;