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

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

Signed-off-by: Wang Qing <wangqing@vivo.com>
Link: https://lore.kernel.org/r/1615801744-31548-1-git-send-email-wangqing@vivo.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Wang Qing 2021-03-15 17:49:03 +08:00 committed by Jonathan Corbet
parent 8be594b22a
commit c5c1c700e2
1 changed files with 0 additions and 20 deletions
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20
Documentation/admin-guide/kernel-per-CPU-kthreads.rst
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@ -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.