linux-kernel - Re: [PATCH] sched/Documentation: Add RT_RUNTIME

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Date: Fri, 12 Apr 2024 09:50:26 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Zhang Qiao <zhangqiao22@...wei.com>, corbet@....net
Cc: mingo@...nel.org, chrubis@...e.cz, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] sched/Documentation: Add RT_RUNTIME_SHARE documentation

On Wed, Jan 31, 2024 at 08:32:38PM +0800, Zhang Qiao wrote:
> +2.4 RT_RUNTIME_SHARE sched feature
> +----------------------------

htmldocs build reports new warning:

Documentation/scheduler/sched-rt-group.rst:151: WARNING: Title underline too short.

2.4 RT_RUNTIME_SHARE sched feature
----------------------------

I have to extend the underline:

---- >8 ----
diff --git a/Documentation/scheduler/sched-rt-group.rst b/Documentation/scheduler/sched-rt-group.rst
index 4d8eceb71f5ed8..751113fcd35850 100644
--- a/Documentation/scheduler/sched-rt-group.rst
+++ b/Documentation/scheduler/sched-rt-group.rst
@@ -148,7 +148,7 @@ For now, this can be simplified to just the following (but see Future plans):
    \Sum_{i} runtime_{i} <= global_runtime
 
 2.4 RT_RUNTIME_SHARE sched feature
-----------------------------
+----------------------------------
 
 RT_RUNTIME_SHARE allows a cpu borrows rt-runtime from other cpus if it runs
 out of its own rt-runtime.

Wording suggestions below.

> +
> +RT_RUNTIME_SHARE allows a cpu borrows rt-runtime from other cpus if it runs
"... to borrow rt-runtime ..."
> +out of its own rt-runtime.
> +
> +With this feature enabled, a rt-task probably hits 100% cpu usage and starves
"... a rt-task may hit ... and can stall other per-cpu tasks ..."
> +per-cpu tasks like kworkers, as a result, it may hang up the whole system.
"..., which lead into system hang."
> +Therefore, in order to avoid such exception, recommand to disable this feature
> +by default unless you really know what you're up to.
"Thus, it is advised to disable this feature by default to avoid aforementioned
issue unless you know what you're doing."

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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