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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mingo@kernel.org, tglx@linutronix.de, juri.lelli@arm.com,
	rostedt@goodmis.org, xlpang@redhat.com,
	linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com,
	jdesfossez@efficios.com, bristot@redhat.com
Subject: Re: [RFC][PATCH 4/4] futex: Rewrite FUTEX_UNLOCK_PI
Date: Wed, 5 Oct 2016 10:21:02 +0200	[thread overview]
Message-ID: <20161005082102.lm3jze3hzikkzxcg@linutronix.de> (raw)
In-Reply-To: <20161005080912.GF3142@twins.programming.kicks-ass.net>

On 2016-10-05 10:09:12 [+0200], Peter Zijlstra wrote:
> On Wed, Oct 05, 2016 at 09:41:47AM +0200, Sebastian Andrzej Siewior wrote:
> > are those problems DL related?
> 
> One of them, the other is that PI thing you did that ugly nodeboost
> thing for, right?

this no-de-boost yes. This is probably a problem since we have this
"delayed" wake-up. I've been thinking about a marked in PI state to
ignore a de-boost so the spin_unlock() won't be a problem. But if I
understand it right, then this won't solve the DL problem since you
can't have two tasks at the same priority.

Sebastian

  reply	other threads:[~2016-10-05  8:21 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-03  9:12 [RFC][PATCH 0/4] FUTEX_UNLOCK_PI wobbles Peter Zijlstra
2016-10-03  9:12 ` [RFC][PATCH 1/4] futex: Cleanup variable names for futex_top_waiter() Peter Zijlstra
2016-10-03 14:15   ` Steven Rostedt
2016-10-05  3:58   ` Davidlohr Bueso
2016-10-03  9:12 ` [RFC][PATCH 2/4] futex: Use smp_store_release() in mark_wake_futex() Peter Zijlstra
2016-10-03 14:19   ` Steven Rostedt
2016-10-05  3:57   ` Davidlohr Bueso
2016-10-05  6:20     ` Peter Zijlstra
2016-10-03  9:12 ` [RFC][PATCH 3/4] futex: Remove rt_mutex_deadlock_account_*() Peter Zijlstra
2016-10-03  9:34   ` Peter Zijlstra
2016-10-03 14:25   ` Steven Rostedt
2016-10-05  1:08   ` Davidlohr Bueso
2016-10-05  7:29   ` Sebastian Andrzej Siewior
2016-10-03  9:12 ` [RFC][PATCH 4/4] futex: Rewrite FUTEX_UNLOCK_PI Peter Zijlstra
2016-10-03 15:36   ` Steven Rostedt
2016-10-03 15:44     ` Peter Zijlstra
2016-10-03 15:45     ` Peter Zijlstra
2016-10-03 16:23       ` Steven Rostedt
2016-10-05  7:41   ` Sebastian Andrzej Siewior
2016-10-05  8:09     ` Peter Zijlstra
2016-10-05  8:21       ` Sebastian Andrzej Siewior [this message]
2016-10-05  8:32         ` Peter Zijlstra
2016-10-06 10:29   ` Peter Zijlstra
2016-10-07 11:21   ` Peter Zijlstra
2016-10-08 15:53     ` Thomas Gleixner
2016-10-08 16:55       ` Peter Zijlstra
2016-10-08 17:06         ` Thomas Gleixner
2016-10-10 10:17         ` Thomas Gleixner
2016-10-10 11:40           ` Peter Zijlstra
2016-10-21 12:27           ` Peter Zijlstra
2016-10-27 20:36             ` Thomas Gleixner
2016-11-23 19:20               ` Peter Zijlstra
2016-11-24 16:52                 ` Peter Zijlstra
2016-11-24 17:56                   ` Thomas Gleixner
2016-11-24 18:58                     ` Peter Zijlstra
2016-11-25  9:23                       ` Peter Zijlstra
2016-11-25 10:03                         ` Peter Zijlstra
2016-11-25 19:13                           ` Thomas Gleixner
2016-11-25 14:09               ` Peter Zijlstra
2016-10-08 18:22     ` Thomas Gleixner
2016-10-09 11:17     ` Thomas Gleixner
2016-10-10 14:06       ` Peter Zijlstra
2016-10-05  1:02 ` [RFC][PATCH 0/4] FUTEX_UNLOCK_PI wobbles Davidlohr Bueso
2016-10-05  6:20   ` Peter Zijlstra
2016-10-05  7:26     ` Sebastian Andrzej Siewior
2016-10-05 16:04     ` Davidlohr Bueso

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