linux-kernel - Re: [PATCH V2 3/3] sched/deadline: Tracepoints for deadline scheduler

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Date:	Tue, 29 Mar 2016 17:16:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Juri Lelli <juri.lelli@....com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH V2 3/3] sched/deadline: Tracepoints for deadline scheduler

On Mon, Mar 28, 2016 at 01:50:51PM -0300, Daniel Bristot de Oliveira wrote:
> @@ -733,7 +738,9 @@ static void update_curr_dl(struct rq *rq)
>  
>  throttle:
>  	if (dl_runtime_exceeded(dl_se) || dl_se->dl_yielded) {
> +		trace_sched_deadline_yield(&rq->curr->dl);
>  		dl_se->dl_throttled = 1;
> +		trace_sched_deadline_throttle(dl_se);

This is just really very sad.

>  		__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.