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From: Peter Zijlstra <peterz@infradead.org>
To: Juri Lelli <juri.lelli@arm.com>
Cc: mingo@kernel.org, tglx@linutronix.de, rostedt@goodmis.org,
	xlpang@redhat.com, linux-kernel@vger.kernel.org,
	mathieu.desnoyers@efficios.com, jdesfossez@efficios.com,
	bristot@redhat.com, Ingo Molnar <mingo@redhat.com>
Subject: Re: [RFC][PATCH 1/8] rtmutex: Deboost before waking up the top waiter
Date: Tue, 14 Jun 2016 15:59:39 +0200	[thread overview]
Message-ID: <20160614135939.GA3704@worktop> (raw)
In-Reply-To: <20160614132031.GL5981@e106622-lin>

On Tue, Jun 14, 2016 at 02:20:31PM +0100, Juri Lelli wrote:
> On 14/06/16 14:54, Peter Zijlstra wrote:
> > On Tue, Jun 14, 2016 at 10:09:34AM +0100, Juri Lelli wrote:
> > > I've got only nitpicks for the changelog. Otherwise the patch looks good
> > > to me (and yes, without it bw inheritance would be a problem).
> > 
> > So for bw inheritance I'm still not sure how to dead with the faxt that
> > the top_pi_waiter, while blocked, can still be running, spin waiting.
> > 
> 
> You mean for M-BWI (multiprocessor), right? If that's the case, we were
> actually discussing this thing with Pisa/Trento folks yesterday. I'm not
> sure yet as well, but plan seems to be to get first things right with
> current DI code (Luca was saying that there is a BUG somewhere); then
> move to implement BWI; and then tackle the M- case (and see what we can
> do to work around the theoretical need for spin waiting). We actually
> got some ideas a while back, but I need to go there and refresh my mind.
> 
> If the plan sounds reasonable to you, it seems that we can start this
> discussion as soon as Luca has his DI fixes ready. What you think?

No objections.

  reply	other threads:[~2016-06-14 14:00 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-07 19:56 [RFC][PATCH 0/8] PI and assorted failings Peter Zijlstra
2016-06-07 19:56 ` [RFC][PATCH 1/8] rtmutex: Deboost before waking up the top waiter Peter Zijlstra
2016-06-14  9:09   ` Juri Lelli
2016-06-14 12:54     ` Peter Zijlstra
2016-06-14 13:20       ` Juri Lelli
2016-06-14 13:59         ` Peter Zijlstra [this message]
2016-06-14 16:36     ` Davidlohr Bueso
2016-06-14 17:01       ` Juri Lelli
2016-06-14 18:22   ` Steven Rostedt
2016-06-07 19:56 ` [RFC][PATCH 2/8] sched/rtmutex/deadline: Fix a PI crash for deadline tasks Peter Zijlstra
2016-06-14 10:21   ` Juri Lelli
2016-06-14 12:30     ` Peter Zijlstra
2016-06-14 12:53     ` Xunlei Pang
2016-06-14 13:07       ` Juri Lelli
2016-06-14 16:39         ` Juri Lelli
2016-06-14 18:42   ` Steven Rostedt
2016-06-14 20:28     ` Peter Zijlstra
2016-06-15 16:14       ` Steven Rostedt
2016-06-07 19:56 ` [RFC][PATCH 3/8] sched/deadline/rtmutex: Dont miss the dl_runtime/dl_period update Peter Zijlstra
2016-06-14 10:43   ` Juri Lelli
2016-06-14 12:09     ` Peter Zijlstra
2016-06-15 16:30   ` Steven Rostedt
2016-06-15 17:55     ` Peter Zijlstra
2016-06-07 19:56 ` [RFC][PATCH 4/8] rtmutex: Remove rt_mutex_fastunlock() Peter Zijlstra
2016-06-15 16:43   ` Steven Rostedt
2016-06-07 19:56 ` [RFC][PATCH 5/8] rtmutex: Clean up Peter Zijlstra
2016-06-14 12:08   ` Juri Lelli
2016-06-14 12:32     ` Peter Zijlstra
2016-06-14 12:41       ` Juri Lelli
2016-06-07 19:56 ` [RFC][PATCH 6/8] sched/rtmutex: Refactor rt_mutex_setprio() Peter Zijlstra
2016-06-14 13:14   ` Juri Lelli
2016-06-14 14:08     ` Peter Zijlstra
2016-06-07 19:56 ` [RFC][PATCH 7/8] sched,tracing: Update trace_sched_pi_setprio() Peter Zijlstra
2016-06-07 19:56 ` [RFC][PATCH 8/8] rtmutex: Fix PI chain order integrity Peter Zijlstra
2016-06-14 17:39   ` Juri Lelli
2016-06-14 19:44     ` Peter Zijlstra
2016-06-15  7:25       ` Juri Lelli
2016-06-27 12:23         ` Peter Zijlstra
2016-06-27 12:40           ` Thomas Gleixner
2016-06-28  9:05           ` Juri Lelli

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