linux-kernel - Re: [PATCH 05/16] sched: SCHED_DEADLINE policy implementation.

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Message-ID: <1335195826.28150.177.camel@twins>
Date:	Mon, 23 Apr 2012 17:43:46 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Juri Lelli <juri.lelli@...il.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, rostedt@...dmis.org,
	cfriesen@...tel.com, oleg@...hat.com, fweisbec@...il.com,
	darren@...art.com, johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	luca.abeni@...tn.it, dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...csson.com, liming.wang@...driver.com
Subject: Re: [PATCH 05/16] sched: SCHED_DEADLINE policy implementation.

On Mon, 2012-04-23 at 17:39 +0200, Juri Lelli wrote:
> On 04/23/2012 04:35 PM, Peter Zijlstra wrote:
> > On Fri, 2012-04-06 at 09:14 +0200, Juri Lelli wrote:
> >> +static void init_dl_task_timer(struct sched_dl_entity *dl_se)
> >> +{
> >> +       struct hrtimer *timer =&dl_se->dl_timer;
> >> +
> >> +       if (hrtimer_active(timer)) {
> >> +               hrtimer_try_to_cancel(timer);
> >> +               return;
> >> +       }
> >
> > Same question I guess, how can it be active here? Also, just letting it
> > run doesn't seem like the best way out..
> >
> 
> Probably s/hrtimer_try_to_cancel/hrtimer_cancel is better.

Yeah, not sure you can do hrtimer_cancel() there though, you're holding
->pi_lock and rq->lock and have IRQs disabled. That sounds like asking
for trouble.

Anyway, if it can't happen, we don't have to fix it.. so lets answer
that first ;-)
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