path: root/Documentation/sysctl
diff options
authorLi Zefan <lizefan@huawei.com>2013-05-17 10:31:20 +0800
committerIngo Molnar <mingo@kernel.org>2013-05-28 11:28:19 +0200
commit08825c90af6e4bb902b3a51abb0ae6530199f682 (patch)
treefc1dee42a4589eb4fd84f2f1b2bd00ad7471c725 /Documentation/sysctl
parenta6572f84c5b135d9b6df279ed3c8de028bd1edd9 (diff)
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>
Diffstat (limited to 'Documentation/sysctl')
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index ccd42589e124..e8fabd6cda35 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.
+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.