From: Randy Dunlap <rdunlap@infradead.org>
To: John Stultz <jstultz@google.com>, LKML <linux-kernel@vger.kernel.org>
Cc: Connor O'Brien <connoro@google.com>,
John Dias <joaodias@google.com>, Rick Yiu <rickyiu@google.com>,
John Kacur <jkacur@redhat.com>, Qais Yousef <qais.yousef@arm.com>,
Chris Redpath <chris.redpath@arm.com>,
Abhijeet Dharmapurikar <adharmap@quicinc.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
kernel-team@android.com, "J . Avila" <elavila@google.com>
Subject: Re: [RFC][PATCH 1/2] sched: Avoid placing RT threads on cores handling long softirqs
Date: Wed, 10 Aug 2022 19:11:40 -0700 [thread overview]
Message-ID: <9d2f1a82-8e0f-c0ad-e23f-e0d00905a596@infradead.org> (raw)
In-Reply-To: <20220811015758.3001641-2-jstultz@google.com>
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
next prev parent reply other threads:[~2022-08-11 2:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-11 1:57 [RFC][PATCH 0/2] Softirq -rt Optimizations John Stultz
2022-08-11 1:57 ` [RFC][PATCH 1/2] sched: Avoid placing RT threads on cores handling long softirqs John Stultz
2022-08-11 2:11 ` Randy Dunlap [this message]
2022-08-11 2:15 ` John Stultz
2022-08-11 1:57 ` [RFC][PATCH 2/2] softirq: defer softirq processing to ksoftirqd if CPU is busy with RT John Stultz
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