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

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Message-ID: <20250317145015.GA31506@noisy.programming.kicks-ass.net>
Date: Mon, 17 Mar 2025 15:50:15 +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 Mon, Mar 17, 2025 at 03:44:11PM +0100, John Stultz wrote:
> On Mon, Mar 17, 2025 at 3:33 PM Peter Zijlstra <peterz@...radead.org> wrote:
> > 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?
> 
> Did you mean SMP there?  SMP is supported. Even with same rq proxying,
> it just blocks the task and lets it sleep if the owner is on another
> rq.

Ah, yes, typing hard. And yes, I missed it would work rq local. Still
trying to untangle the proxy_deactivate() failure case :-)