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From: Juri Lelli <juri.lelli@redhat.com>
To: Scott Wood <swood@redhat.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	Steven Rostedt <rostedt@goodmis.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Clark Williams <williams@redhat.com>,
	linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org
Subject: Re: [PATCH RT 5/8] sched/deadline: Reclaim cpuset bandwidth in .migrate_task_rq()
Date: Tue, 1 Oct 2019 10:52:09 +0200	[thread overview]
Message-ID: <20191001085209.GA6481@localhost.localdomain> (raw)
In-Reply-To: <9acc5f1bd0fe06acb2b7b518c5ef1f082e89ad63.camel@redhat.com>

On 30/09/19 11:24, Scott Wood wrote:
> On Mon, 2019-09-30 at 09:12 +0200, Juri Lelli wrote:

[...]

> > Hummm, I was actually more worried about the fact that we call free_old_
> > cpuset_bw_dl() only if p->state != TASK_WAKING.
> 
> Oh, right. :-P  Not sure what I had in mind there; we want to call it
> regardless.
> 
> I assume we need rq->lock in free_old_cpuset_bw_dl()?  So something like

I think we can do with rcu_read_lock_sched() (see dl_task_can_attach()).

> this:
> 
> 	if (p->state == TASK_WAITING)
> 		raw_spin_lock(&rq->lock);
> 	free_old_cpuset_bw_dl(rq, p);
> 	if (p->state != TASK_WAITING)
> 		return;
> 
> 	if (p->dl.dl_non_contending) {
> 	....	
> 
> BTW, is the full cpumask_intersects() necessary or would it suffice to see
> that the new cpu is not in the old span?

Checking new cpu only should be OK.

Thanks,

Juri

  reply	other threads:[~2019-10-01  8:52 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-27  5:56 [RT PATCH 0/8] migrate disable fixes and performance Scott Wood
2019-07-27  5:56 ` [PATCH RT 1/8] sched: migrate_enable: Use sleeping_lock to indicate involuntary sleep Scott Wood
2019-07-29 13:26   ` Steven Rostedt
2019-07-27  5:56 ` [PATCH RT 2/8] sched: __set_cpus_allowed_ptr: Check cpus_mask, not cpus_ptr Scott Wood
2019-09-17 14:57   ` Sebastian Andrzej Siewior
2019-09-17 15:23     ` Scott Wood
2019-07-27  5:56 ` [PATCH RT 3/8] sched: Remove dead __migrate_disabled() check Scott Wood
2019-07-27  5:56 ` [PATCH RT 4/8] sched: migrate disable: Protect cpus_ptr with lock Scott Wood
2019-09-26 16:39   ` Sebastian Andrzej Siewior
2019-09-26 16:52     ` Scott Wood
2019-09-27 12:19       ` Sebastian Andrzej Siewior
2019-09-27 20:02         ` Scott Wood
2019-07-27  5:56 ` [PATCH RT 5/8] sched/deadline: Reclaim cpuset bandwidth in .migrate_task_rq() Scott Wood
2019-09-17 15:10   ` Sebastian Andrzej Siewior
2019-09-27  8:11   ` Juri Lelli
2019-09-27 16:40     ` Scott Wood
2019-09-30  7:12       ` Juri Lelli
2019-09-30 16:24         ` Scott Wood
2019-10-01  8:52           ` Juri Lelli [this message]
2019-10-09  6:25             ` Scott Wood
2019-10-09  7:27               ` Juri Lelli
2019-10-09 19:12                 ` Scott Wood
2019-10-10  8:18                   ` Juri Lelli
2019-07-27  5:56 ` [PATCH RT 6/8] sched: migrate_enable: Set state to TASK_RUNNING Scott Wood
2019-09-17 15:31   ` Sebastian Andrzej Siewior
2019-09-17 17:54     ` Scott Wood
2019-07-27  5:56 ` [PATCH RT 7/8] sched: migrate_enable: Use select_fallback_rq() Scott Wood
2019-09-17 16:00   ` Sebastian Andrzej Siewior
2019-09-24 18:05     ` Scott Wood
2019-07-27  5:56 ` [PATCH RT 8/8] sched: Lazy migrate_disable processing Scott Wood
2019-09-17 16:50   ` Sebastian Andrzej Siewior
2019-09-17 17:06     ` Scott Wood

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