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Message-ID: <Zhihch_S1_-1JhwK@archie.me>
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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