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Re: [PATCH] kernel/sched/rt: Add a rescheduling point

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  Re: [PATCH] kernel/sched/rt: Add a rescheduling point Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2017-01-24 15:50 +0100
    Re: [PATCH] kernel/sched/rt: Add a rescheduling point Peter Zijlstra <peterz@infradead.org> - 2017-01-24 16:20 +0100

#1565909 — Re: [PATCH] kernel/sched/rt: Add a rescheduling point

On 2017-01-24 15:40:06 [+0100], To Peter Zijlstra wrote:
> Since the change in commit fd7a4bed1835 ("sched, rt: Convert
> switched_{from, to}_rt() / prio_changed_rt() to balance callbacks") we
> don't reschedule a task under certain circumstances:

|switched_to_dl()
|{
|…
|         if (rq->curr != p) {
| #ifdef CONFIG_SMP
|                 if (tsk_nr_cpus_allowed(p) > 1 && rq->dl.overloaded)
|                         queue_push_tasks(rq);
| #else
|                 if (dl_task(rq->curr))
|                         check_preempt_curr_dl(rq, p, 0);
|                 else
|                         resched_curr(rq);
| #endif
|         }
| }

This looks like it asks for a similar change.

Sebastian

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#1565935

On Tue, Jan 24, 2017 at 03:43:54PM +0100, Sebastian Andrzej Siewior wrote:
> On 2017-01-24 15:40:06 [+0100], To Peter Zijlstra wrote:
> > Since the change in commit fd7a4bed1835 ("sched, rt: Convert
> > switched_{from, to}_rt() / prio_changed_rt() to balance callbacks") we
> > don't reschedule a task under certain circumstances:
> 
> |switched_to_dl()
> |{
> |…
> |         if (rq->curr != p) {
> | #ifdef CONFIG_SMP
> |                 if (tsk_nr_cpus_allowed(p) > 1 && rq->dl.overloaded)
> |                         queue_push_tasks(rq);
> | #else
> |                 if (dl_task(rq->curr))
> |                         check_preempt_curr_dl(rq, p, 0);
> |                 else
> |                         resched_curr(rq);
> | #endif
> |         }
> | }
> 
> This looks like it asks for a similar change.

Indeed.

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