linux-kernel - Re: [PATCH v11 7/7] sched: Split scheduler and execution contexts

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Message-ID: <ZqoJtszWte1IvF0Q@jlelli-thinkpadt14gen4.remote.csb>
Date: Wed, 31 Jul 2024 11:53:58 +0200
From: Juri Lelli <juri.lelli@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: John Stultz <jstultz@...gle.com>, LKML <linux-kernel@...r.kernel.org>,
	Joel Fernandes <joelaf@...gle.com>,
	Qais Yousef <qyousef@...alina.io>, Ingo Molnar <mingo@...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>,
	Youssef Esmat <youssefesmat@...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>,
	Xuewen Yan <xuewen.yan94@...il.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Metin Kaya <Metin.Kaya@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>, kernel-team@...roid.com,
	Connor O'Brien <connoro@...gle.com>
Subject: Re: [PATCH v11 7/7] sched: Split scheduler and execution contexts

On 12/07/24 17:01, Peter Zijlstra wrote:
> On Tue, Jul 09, 2024 at 01:31:50PM -0700, John Stultz wrote:
> > From: Peter Zijlstra <peterz@...radead.org>
> > 
> > Let's define the scheduling context as all the scheduler state
> > in task_struct for the task selected to run, and the execution
> > context as all state required to actually run the task.
> > 
> > Currently both are intertwined in task_struct. We want to
> > logically split these such that we can use the scheduling
> > context of the task selected to be scheduled, but use the
> > execution context of a different task to actually be run.
> > 
> > To this purpose, introduce rq_selected() macro to point to the
> > task_struct selected from the runqueue by the scheduler, and
> > will be used for scheduler state, and preserve rq->curr to
> > indicate the execution context of the task that will actually be
> > run.
> 
> > * Swapped proxy for selected for clarity
> 
> I'm not loving this naming...  what does selected even mean? What was
> wrong with proxy? -- (did we have this conversation before?)

Or maybe curr and sched_ctx as an alternative (if proxy confuses people
:), so that it's more direct/straightforward (even though it's not
symmetric)?