linux-kernel - Re: [PATCH v2] sched/Documentation: Add RT_RUNTIME

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Date: Mon, 27 May 2024 11:13:31 +0800
From: Zhang Qiao <zhangqiao22@...wei.com>
To: <mingo@...nel.org>, <chrubis@...e.cz>, <rostedt@...dmis.org>,
	<bagasdotme@...il.com>, <corbet@....net>
CC: <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] sched/Documentation: Add RT_RUNTIME_SHARE
 documentation

Ping.

在 2024/4/19 17:04, Zhang Qiao 写道:
> RT_RUNTIME_SHARE is an important strategy for rt bandwidth, and
> we should document this sched feature.
> 
> Signed-off-by: Zhang Qiao <zhangqiao22@...wei.com>
> Improvements-suggested-by: Bagas Sanjaya <bagasdotme@...il.com>
> ---
>  Documentation/scheduler/sched-rt-group.rst | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/Documentation/scheduler/sched-rt-group.rst b/Documentation/scheduler/sched-rt-group.rst
> index d685609ed3d7..eea2fc6f068f 100644
> --- a/Documentation/scheduler/sched-rt-group.rst
> +++ b/Documentation/scheduler/sched-rt-group.rst
> @@ -12,6 +12,7 @@ Real-Time group scheduling
>       2.1 System-wide settings
>       2.2 Default behaviour
>       2.3 Basis for grouping tasks
> +     2.4 RT_RUNTIME_SHARE sched feature
>     3. Future plans
>  
>  
> @@ -146,6 +147,17 @@ 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 to borrow rt-runtime from other cpus if it runs
> +out of its own rt-runtime.
> +
> +With this feature enabled, a rt-task may hit 100% cpu usage and can stall other
> +per-cpu tasks like kworkers, as a result, which leads into system hang.
> +
> +Thus, it is advised to disable this feature by default to avoid aforementioned
> +issue unless you know what you're doing.
>  
>  3. Future plans
>  ===============
>