Re: [PATCH v9 7/7] sched: Split scheduler and execution contexts
From: Metin Kaya
Date: Mon Mar 18 2024 - 11:07:18 EST
On 15/03/2024 4:39 am, John Stultz wrote:
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
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@xxxxxxxxxx>
Cc: Qais Yousef <qyousef@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Juri Lelli <juri.lelli@xxxxxxxxxx>
Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Cc: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
Cc: Valentin Schneider <vschneid@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Ben Segall <bsegall@xxxxxxxxxx>
Cc: Zimuzo Ezeozue <zezeozue@xxxxxxxxxx>
Cc: Youssef Esmat <youssefesmat@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Waiman Long <longman@xxxxxxxxxx>
Cc: Boqun Feng <boqun.feng@xxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
Cc: Xuewen Yan <xuewen.yan94@xxxxxxxxx>
Cc: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Cc: Metin Kaya <Metin.Kaya@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: kernel-team@xxxxxxxxxxx
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Juri Lelli <juri.lelli@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Duplicate S-o-b for Peter.
[snip]