watchdog: Document watchdog_thresh sysctl
Signed-off-by: Li Zefan <lizefan@huawei.com> Acked-by: Don Zickus <dzickus@redhat.com> Link: http://lkml.kernel.org/r/51959678.6000802@huawei.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -76,6 +76,7 @@ show up in /proc/sys/kernel:
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- tainted
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- tainted
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- threads-max
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- threads-max
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- unknown_nmi_panic
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- unknown_nmi_panic
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- watchdog_thresh
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- version
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- version
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==============================================================
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==============================================================
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@ -648,3 +649,16 @@ that time, kernel debugging information is displayed on console.
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NMI switch that most IA32 servers have fires unknown NMI up, for
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NMI switch that most IA32 servers have fires unknown NMI up, for
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example. If a system hangs up, try pressing the NMI switch.
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example. If a system hangs up, try pressing the NMI switch.
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==============================================================
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watchdog_thresh:
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This value can be used to control the frequency of hrtimer and NMI
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events and the soft and hard lockup thresholds. The default threshold
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is 10 seconds.
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The softlockup threshold is (2 * watchdog_thresh). Setting this
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tunable to zero will disable lockup detection altogether.
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==============================================================
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