linux-kernel - [PATCH V2 2/4] doc: watchdog: Delete the explanation about "watchdog/%u".

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Date:   Thu,  1 Apr 2021 11:31:32 +0800
From:   Wang Qing <wangqing@...o.com>
To:     Jonathan Corbet <corbet@....net>, Joe Perches <joe@...ches.com>,
        Wang Qing <wangqing@...o.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Stephen Kitt <steve@....org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Guilherme G. Piccoli" <gpiccoli@...onical.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Qais Yousef <qais.yousef@....com>,
        Petr Mladek <pmladek@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Santosh Sivaraj <santosh@...six.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     gregkh@...uxfoundation.org
Subject: [PATCH V2 2/4] doc: watchdog: Delete the explanation about "watchdog/%u".

"watchdog/%u" threads has be replaced by cpu_stop_work. The current description
is extremely misleading, so delete the explanation about "watchdog/%u".

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 .../admin-guide/kernel-per-CPU-kthreads.rst          | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/Documentation/admin-guide/kernel-per-CPU-kthreads.rst b/Documentation/admin-guide/kernel-per-CPU-kthreads.rst
index 531f689..5e51ee5
--- 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.
-- 
2.7.4