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watchdog: Document watchdog_thresh sysctl

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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>
This commit is contained in:
Li Zefan 2013-05-17 10:31:20 +08:00 committed by Ingo Molnar
parent a6572f84c5
commit 08825c90af
1 changed files with 14 additions and 0 deletions
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14
Documentation/sysctl/kernel.txt
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@ -76,6 +76,7 @@ show up in /proc/sys/kernel:
- tainted
- threads-max
- unknown_nmi_panic
- watchdog_thresh
- version
==============================================================
@ -648,3 +649,16 @@ that time, kernel debugging information is displayed on console.
NMI switch that most IA32 servers have fires unknown NMI up, for
example. If a system hangs up, try pressing the NMI switch.
==============================================================
watchdog_thresh:
This value can be used to control the frequency of hrtimer and NMI
events and the soft and hard lockup thresholds. The default threshold
is 10 seconds.
The softlockup threshold is (2 * watchdog_thresh). Setting this
tunable to zero will disable lockup detection altogether.
==============================================================