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

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Message-ID: <496a2f13-2d66-48f4-a710-afbd90f1bfd8@arm.com>
Date: Mon, 18 Mar 2024 15:06:49 +0000
From: Metin Kaya <metin.kaya@....com>
To: John Stultz <jstultz@...gle.com>, LKML <linux-kernel@...r.kernel.org>
Cc: 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 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.

[snip]