linux-kernel - Re: [PATCH v9 7/7] sched: Split scheduler and execution contexts

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Date: Mon, 1 Apr 2024 16:34:21 -0700
From: John Stultz <jstultz@...gle.com>
To: Metin Kaya <metin.kaya@....com>
Cc: LKML <linux-kernel@...r.kernel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Joel Fernandes <joelaf@...gle.com>, Qais Yousef <qyousef@...gle.com>, 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>, Youssef Esmat <youssefesmat@...gle.com>, 
	Mel Gorman <mgorman@...e.de>, Daniel Bristot de Oliveira <bristot@...hat.com>, 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>, Thomas Gleixner <tglx@...utronix.de>, kernel-team@...roid.com, 
	"Connor O'Brien" <connoro@...gle.com>
Subject: Re: [PATCH v9 7/7] sched: Split scheduler and execution contexts

On Mon, Mar 18, 2024 at 8:06 AM Metin Kaya <metin.kaya@....com> wrote:
> On 15/03/2024 4:39 am, 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.
> >
> > Cc: Joel Fernandes <joelaf@...gle.com>
> > Cc: Qais Yousef <qyousef@...gle.com>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Juri Lelli <juri.lelli@...hat.com>
> > Cc: Vincent Guittot <vincent.guittot@...aro.org>
> > Cc: Dietmar Eggemann <dietmar.eggemann@....com>
> > Cc: Valentin Schneider <vschneid@...hat.com>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > Cc: Ben Segall <bsegall@...gle.com>
> > Cc: Zimuzo Ezeozue <zezeozue@...gle.com>
> > Cc: Youssef Esmat <youssefesmat@...gle.com>
> > Cc: Mel Gorman <mgorman@...e.de>
> > Cc: Daniel Bristot de Oliveira <bristot@...hat.com>
> > Cc: Will Deacon <will@...nel.org>
> > Cc: Waiman Long <longman@...hat.com>
> > Cc: Boqun Feng <boqun.feng@...il.com>
> > Cc: "Paul E. McKenney" <paulmck@...nel.org>
> > Cc: Xuewen Yan <xuewen.yan94@...il.com>
> > Cc: K Prateek Nayak <kprateek.nayak@....com>
> > Cc: Metin Kaya <Metin.Kaya@....com>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: kernel-team@...roid.com
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > Signed-off-by: Juri Lelli <juri.lelli@...hat.com>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
>
> Duplicate S-o-b for Peter.

Yes, though I believe this accurately tracks the path of development.

The patch originally by Peter was sent by Juri:
  https://lore.kernel.org/all/20181009092434.26221-5-juri.lelli@redhat.com/

Then and Peter put it in a branch on his git tree(adding another SoB
and the Link tag), from which Conor picked it up:
  https://lore.kernel.org/lkml/20221003214501.2050087-6-connoro@google.com/

Followed by me.

That said, I can no longer find the branch in Peter's tree, so it's
possible I have this history wrong, but this is what I recall.

So I'm hesitant to change that part of the attribution, unless Peter
requests otherwise.

thanks
-john