linux-kernel - Re: [PATCH -rfc 4/4] locking/rtmutex: Support spin on owner (osq)

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Date:	Tue, 9 Jun 2015 14:53:36 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Davidlohr Bueso <dave@...olabs.net>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -rfc 4/4] locking/rtmutex: Support spin on owner (osq)

On Tue, 9 Jun 2015, Peter Zijlstra wrote:

> On Tue, Jun 09, 2015 at 11:29:59AM +0200, Thomas Gleixner wrote:
> > 
> > If you look at the RT code, then you'll notice that in the slow lock
> > path we queue the incoming waiter (including the PI dance) and then
> > spin only if the waiter is the top waiter on the lock.
> 
> On a related note; does the RT code still add lock stealing to rtmutex?

No.
 
> We allow higher prio lock stealing, but I seem to remember a longish
> debate if we should allow equal prio lock stealing.

Right. We never finished that one:)

Thanks,

	tglx
 
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