Hi Peter,
This may increase the overhead of schedule() a bit, as it will have
more work to do.
check_class_changed():
if (prev_class->switched_from)
prev_class->switched_from(rq, p);
/* Possble rq->lock 'hole'. */
p->sched_class->switched_to(rq, p);
For above cases, why can't we just add a judgement in switched_to_fair()
as follows:
if (rq != task_rq(p))
return;
switched_to_rt() and switched_to_dl() already did the similar judgement.
Then the following operation is usually task_rq_unlock() or the like,
seems no other harm with the old rq of p.
-Xunlei
Peter Zijlstra <[email protected]> wrote 2015-06-01 PM 09:58:19:
> [RFC][PATCH 1/7] sched: Replace post_schedule with a balance callback
list
>
> Generalize the post_schedule() stuff into a balance callback list.
> This allows us to more easily use it outside of schedule() and cross
> sched_class.
>
> Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
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