Re: [RFC][PATCH 1/2] sched: Avoid placing RT threads on cores handling long softirqs

From: Randy Dunlap
Date: Wed Aug 10 2022 - 22:11:55 EST




On 8/10/22 18:57, John Stultz wrote:
> diff --git a/init/Kconfig b/init/Kconfig
> index c7900e8975f1..b0dde2771314 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1278,6 +1278,17 @@ config SCHED_AUTOGROUP
> desktop applications. Task group autogeneration is currently based
> upon task session.
>
> +config RT_SOFTIRQ_OPTIMIZATION
> + bool "Improve RT scheduling during long softirq execution"
> + depends on ARM64
> + depends on SMP
> + default n
> + help
> + Enable an optimization which tries to avoid placing RT tasks on CPUs

Above line is indented with spaces only. :(

> + occupied by nonpreemptible tasks, such as a long softirq or CPUs
> + which may soon block preemptions, such as a CPU running a ksoftirq
> + thread which handles slow softirqs.

All help text lines should be indented with one tab + 2 spaces,
per Documentation/process/coding-style.rst.
(The 3 lines above have one tab + one space.)

--
~Randy