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    Subject[PATCH] [PATCH V7] watchdog/core: Add watchdog_thresh command line parameter
    Date
    Both graphics and serial consoles are exposed to hard lockups
    when handling a large amount of messaging. The kernel watchdog_thresh
    parameter up to now has not been available to be set on the kernel line for
    early boot.
    This patch allows the setting of watchdog_thresh to be increased
    when needed to extend the hard lockup timer in the console code.
    Note that this also affects the soft lockup detector

    Signed-off-by: Laurence Oberman <loberman@redhat.com>

    ---
    Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++
    kernel/watchdog.c | 7 +++++++
    2 files changed, 15 insertions(+)

    diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
    index b90fe3b6bc6c..4263937f4aa9 100644
    --- a/Documentation/admin-guide/kernel-parameters.txt
    +++ b/Documentation/admin-guide/kernel-parameters.txt
    @@ -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
    diff --git a/kernel/watchdog.c b/kernel/watchdog.c
    index 977918d5d350..8fbfda94a67b 100644
    --- a/kernel/watchdog.c
    +++ b/kernel/watchdog.c
    @@ -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;

    --
    2.18.1
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