From: Mike Galbraith <efault@gmx.de>
To: Yong Zhang <yong.zhang0@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
samu.p.onkalo@nokia.com, mingo@elte.hu,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
tglx <tglx@linutronix.de>
Subject: Re: Bug in scheduler when using rt_mutex
Date: Wed, 19 Jan 2011 06:40:57 +0100 [thread overview]
Message-ID: <1295415657.8017.113.camel@marge.simson.net> (raw)
In-Reply-To: <AANLkTineieNdiKduDHQ-J+Xv6Pq9O0pTZraBJEw=p5e7@mail.gmail.com>
On Wed, 2011-01-19 at 12:35 +0800, Yong Zhang wrote:
> cfs_rq->curr != se is always true.
If that were always true, we'd illegally enqueue a running task.
if (running)
p->sched_class->set_curr_task(rq);
==> set_curr_task_fair(rq);
==> struct sched_entity *se = &rq->curr->se;
==> set_next_entity(cfs_rq_of(se), se);
==> cfs_rq->curr = se;
(prevents running entity from being enqueued below)
if (on_rq) {
enqueue_task(rq, p, oldprio < prio ? ENQUEUE_HEAD : 0);
check_class_changed(rq, p, prev_class, oldprio, running);
}
-Mike
next prev parent reply other threads:[~2011-01-19 5:41 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-17 14:42 Bug in scheduler when using rt_mutex Onkalo Samu
2011-01-17 15:00 ` Peter Zijlstra
2011-01-17 15:15 ` samu.p.onkalo
2011-01-17 15:28 ` Peter Zijlstra
2011-01-17 16:00 ` Peter Zijlstra
2011-01-18 8:23 ` Onkalo Samu
2011-01-18 8:59 ` Yong Zhang
2011-01-18 13:35 ` Peter Zijlstra
2011-01-18 14:25 ` Onkalo Samu
2011-01-19 2:38 ` Yong Zhang
2011-01-19 3:43 ` Mike Galbraith
2011-01-19 4:35 ` Yong Zhang
2011-01-19 5:40 ` Mike Galbraith [this message]
2011-01-19 6:09 ` Yong Zhang
2011-01-19 6:37 ` Mike Galbraith
2011-01-19 7:19 ` Ingo Molnar
2011-01-19 7:41 ` Mike Galbraith
2011-01-19 9:44 ` Peter Zijlstra
2011-01-19 10:38 ` Peter Zijlstra
2011-01-19 11:30 ` Peter Zijlstra
2011-01-19 12:58 ` Onkalo Samu
2011-01-19 13:13 ` Onkalo Samu
2011-01-19 13:30 ` Peter Zijlstra
2011-01-20 4:18 ` Yong Zhang
2011-01-20 4:27 ` Yong Zhang
2011-01-20 5:32 ` Yong Zhang
2011-01-20 4:59 ` Mike Galbraith
2011-01-20 5:30 ` Yong Zhang
2011-01-20 6:12 ` Mike Galbraith
2011-01-20 7:06 ` Yong Zhang
2011-01-20 8:37 ` Mike Galbraith
2011-01-20 9:07 ` Yong Zhang
2011-01-20 10:07 ` Mike Galbraith
2011-01-21 11:08 ` Peter Zijlstra
2011-01-21 12:24 ` Yong Zhang
2011-01-21 13:40 ` Peter Zijlstra
2011-01-21 15:03 ` Yong Zhang
2011-01-21 15:10 ` Peter Zijlstra
2011-01-21 13:15 ` Yong Zhang
2011-01-20 7:07 ` Onkalo Samu
2011-01-21 6:25 ` Onkalo Samu
2011-01-20 3:10 ` Yong Zhang
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