author: Wang Qing <wangqing@vivo.com> 2021-03-15 17:49:03 +0800
committer: Jonathan Corbet <corbet@lwn.net> 2021-03-31 14:32:02 -0600
commit: c5c1c700e2ea06f27ef3174387b412151ae0b395
parent: 8be594b22adfbc1132bc12c76215160a67931e0c
Commit Summary:
Diffstat:
1 file changed, 0 insertions, 16 deletions
diff --git a/Documentation/admin-guide/kernel-per-CPU-kthreads.rst b/Documentation/admin-guide/kernel-per-CPU-kthreads.rst
index 531f689311f2..5e51ee5b0358 100644
--- a/Documentation/admin-guide/kernel-per-CPU-kthreads.rst
+++ b/Documentation/admin-guide/kernel-per-CPU-kthreads.rst
@@ -332,23 +332,3 @@ To reduce its OS jitter, do at least one of the following:
kthreads from being created in the first place. However, please
note that this will not eliminate OS jitter, but will instead
shift it to RCU_SOFTIRQ.
-
-Name:
- watchdog/%u
-
-Purpose:
- Detect software lockups on each CPU.
-
-To reduce its OS jitter, do at least one of the following:
-
-1. Build with CONFIG_LOCKUP_DETECTOR=n, which will prevent these
- kthreads from being created in the first place.
-2. Boot with "nosoftlockup=0", which will also prevent these kthreads
- from being created. Other related watchdog and softlockup boot
- parameters may be found in Documentation/admin-guide/kernel-parameters.rst
- and Documentation/watchdog/watchdog-parameters.rst.
-3. Echo a zero to /proc/sys/kernel/watchdog to disable the
- watchdog timer.
-4. Echo a large number of /proc/sys/kernel/watchdog_thresh in
- order to reduce the frequency of OS jitter due to the watchdog
- timer down to a level that is acceptable for your workload.