linux-kernel - Re: [PATCH RFC v2 1/2] qspinlock: Introducing a 4-byte queue spinlock implementation

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Message-ID: <20130828091530.7ffe9ad0@gandalf.local.home>
Date:	Wed, 28 Aug 2013 09:15:30 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Alexander Fyodorov <halcy@...dex.ru>,
	Waiman Long <waiman.long@...com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH RFC v2 1/2] qspinlock: Introducing a 4-byte queue
 spinlock implementation

On Wed, 28 Aug 2013 15:05:29 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> On Wed, Aug 28, 2013 at 08:59:57AM -0400, Steven Rostedt wrote:
> > On Wed, 28 Aug 2013 10:19:37 +0200
> > Peter Zijlstra <peterz@...radead.org> wrote:

> 
> > Spin locks only prevent leaks out of the critical section. It does not
> > guarantee leaks into the critical section, thus:
> 
> What's your point? You're just re-iterating the semantics in case
> anybody forgot about them?


I think we are all misunderstanding each other. It sounded like you
didn't want to reimplement a lock to remove memory barriers.

Are you for the smp_mb__after_spin_unlock() ?

I'm getting confused by who is arguing what :-)

-- Steve
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