[tip:perf/core] watchdog: Document watchdog_thresh sysctl

[tip-bot for Li Zefan]

Commit-ID:  08825c90af6e4bb902b3a51abb0ae6530199f682
Gitweb:     http://git.kernel.org/tip/08825c90af6e4bb902b3a51abb0ae6530199f682
Author:     Li Zefan <lizefan@xxxxxxxxxx>
AuthorDate: Fri, 17 May 2013 10:31:20 +0800
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 28 May 2013 11:28:19 +0200

watchdog: Document watchdog_thresh sysctl

Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>
Acked-by: Don Zickus <dzickus@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/51959678.6000802@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 Documentation/sysctl/kernel.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index ccd4258..e8fabd6 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -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.
+
+==============================================================
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