On 03/29/2016 12:16 PM, Peter Zijlstra wrote:
>> + trace_sched_deadline_yield(&rq->curr->dl);
ouch, it should be trace_sched_deadline_yield(dl_se). It works
as is, but it is really very sad, my bad, sorry.
>> > dl_se->dl_throttled = 1;
>> > + trace_sched_deadline_throttle(dl_se);
> This is just really very sad.
Am I missing any other really very sad thing here?
>> > __dequeue_task_dl(rq, curr, 0);
>> > if (unlikely(dl_se->dl_boosted || !start_dl_timer(curr)))
>> > enqueue_task_dl(rq, curr, ENQUEUE_REPLENISH);
>> > @@ -910,6 +917,7 @@ enqueue_dl_entity(struct sched_dl_entity *dl_se,
>> > static void dequeue_dl_entity(struct sched_dl_entity *dl_se)
>> > {
>> > __dequeue_dl_entity(dl_se);
>> > + trace_sched_deadline_block(dl_se);
>> > }
> And that's just not going to happen.
It will, if a task goes to sleep during the activation,
e.g., when blocking on a system call. For example:
<idle>-0 [007] d..3 78377.688969: sched_switch: prev_comm=swapper/7 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=b next_pid=18973 next_prio=-1
b-18973 [007] d..3 78377.688979: sched_deadline_block: now=78377.688976271 deadline=78377.718945137 remaining_runtime=9968866
b-18973 [007] d..3 78377.688981: sched_switch: prev_comm=b prev_pid=18973 prev_prio=-1 prev_state=S ==> next_comm=swapper/7 next_pid=0 next_prio=120
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