linux-kernel - Re: [RFC PATCH v15 1/7] sched: Add CONFIG_SCHED_PROXY

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Message-ID: <20250317143347.GE36386@noisy.programming.kicks-ass.net>
Date: Mon, 17 Mar 2025 15:33:47 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: John Stultz <jstultz@...gle.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Qais Yousef <qyousef@...alina.io>, Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Valentin Schneider <vschneid@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Zimuzo Ezeozue <zezeozue@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>,
	Boqun Feng <boqun.feng@...il.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Metin Kaya <Metin.Kaya@....com>,
	Xuewen Yan <xuewen.yan94@...il.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Suleiman Souhlal <suleiman@...gle.com>, kernel-team@...roid.com
Subject: Re: [RFC PATCH v15 1/7] sched: Add CONFIG_SCHED_PROXY_EXEC & boot
 argument to enable/disable

On Wed, Mar 12, 2025 at 03:11:31PM -0700, John Stultz wrote:

> diff --git a/init/Kconfig b/init/Kconfig
> index d0d021b3fa3b3..b989ddc27444e 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -875,6 +875,16 @@ config UCLAMP_BUCKETS_COUNT
>  
>  	  If in doubt, use the default value.
>  
> +config SCHED_PROXY_EXEC
> +	bool "Proxy Execution"
> +	default n
> +	# Avoid some build failures w/ PREEMPT_RT until it can be fixed
> +	depends on !PREEMPT_RT
	depends on !SPM && !SCHED_CLASS_EXT

for now, right?

> +	depends on EXPERT
> +	help
> +	  This option enables proxy execution, a mechanism for mutex-owning
> +	  tasks to inherit the scheduling context of higher priority waiters.
> +