Commit c5c1c700 authored by Wang Qing's avatar Wang Qing Committed by Jonathan Corbet
Browse files

doc: admin-guide: remove explanation of "watchdog/%u" 



"watchdog/%u" threads has be replaced by cpu_stop_work,
which will mislead the reader.

Signed-off-by: default avatarWang Qing <wangqing@vivo.com>
Link: https://lore.kernel.org/r/1615801744-31548-1-git-send-email-wangqing@vivo.com


Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 8be594b2

Documentation/admin-guide/kernel-per-CPU-kthreads.rst

+0 −20
Original line number Diff line number Diff line
@@ -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.