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From:   Wang Qing <wangqing@vivo.com>
To:     Jonathan Corbet <corbet@lwn.net>, Wang Qing <wangqing@vivo.com>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        Joe Perches <joe@perches.com>, Stephen Kitt <steve@sk2.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Kees Cook <keescook@chromium.org>,
        Randy Dunlap <rdunlap@infradead.org>,
        "Guilherme G. Piccoli" <gpiccoli@canonical.com>,
        Qais Yousef <qais.yousef@arm.com>,
        Petr Mladek <pmladek@suse.com>,
        Santosh Sivaraj <santosh@fossix.org>,
        Vlastimil Babka <vbabka@suse.cz>, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Mathieu Chouquet-Stringer <me@mathieu.digital>
Subject: [PATCH V2,RESEND 2/4] doc: watchdog: Delete the explanation about "watchdog/%u".
Date:   Thu, 29 Apr 2021 17:04:26 +0800
Message-Id: <1619687073-24686-3-git-send-email-wangqing@vivo.com>
In-Reply-To: <1619687073-24686-2-git-send-email-wangqing@vivo.com>
References: <1619687073-24686-2-git-send-email-wangqing@vivo.com>
Precedence: bulk

"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@vivo.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