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sched/core: Further clarify sched_class::set_next_task()

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It turns out there really is something special to the first
set_next_task() invocation. In specific the 'change' pattern really
should not cause balance callbacks.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: bsegall@google.com
Cc: dietmar.eggemann@arm.com
Cc: juri.lelli@redhat.com
Cc: ktkhai@virtuozzo.com
Cc: mgorman@suse.de
Cc: qais.yousef@arm.com
Cc: qperret@google.com
Cc: rostedt@goodmis.org
Cc: valentin.schneider@arm.com
Cc: vincent.guittot@linaro.org
Fixes: f95d4eaee6 ("sched/{rt,deadline}: Fix set_next_task vs pick_next_task")
Link: https://lkml.kernel.org/r/20191108131909.775434698@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2019-11-08 14:16:00 +01:00
committed by Ingo Molnar
parent 2eeb01a28c
commit a0e813f26e
6 changed files with 17 additions and 11 deletions
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4
kernel/sched/stop_task.c
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@@ -29,7 +29,7 @@ check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags)
/* we're never preempted */
}
static void set_next_task_stop(struct rq *rq, struct task_struct *stop)
static void set_next_task_stop(struct rq *rq, struct task_struct *stop, bool first)
{
stop->se.exec_start = rq_clock_task(rq);
}
@@ -39,7 +39,7 @@ static struct task_struct *pick_next_task_stop(struct rq *rq)
if (!sched_stop_runnable(rq))
return NULL;
set_next_task_stop(rq, rq->stop);
set_next_task_stop(rq, rq->stop, true);
return rq->stop;
}