From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Alexander Fyodorov <halcy@yandex.ru>,
Waiman Long <waiman.long@hp.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
"Chandramouleeswaran, Aswin" <aswin@hp.com>,
"Norton, Scott J" <scott.norton@hp.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH RFC v2 1/2] qspinlock: Introducing a 4-byte queue spinlock implementation
Date: Wed, 28 Aug 2013 15:05:29 +0200 [thread overview]
Message-ID: <20130828130529.GP10002@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20130828085957.728a5375@gandalf.local.home>
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@infradead.org> wrote:
>
>
> > > An unlock followed by a lock needs to act like a full barrier, but there
> > > is no requirement that a lock or unlock taken separately act like a
> > > full barrier.
> >
> > But that is already a property of the acquisition/release barrier.
>
> As I mentioned in my fixes for the -rt swait barrier patches I sent.
Not to me you didn't ;-)
> 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?
next prev parent reply other threads:[~2013-08-28 13:05 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <15321377012704@web8h.yandex.ru>
2013-08-21 3:01 ` [PATCH RFC v2 1/2] qspinlock: Introducing a 4-byte queue spinlock implementation Waiman Long
2013-08-21 15:51 ` Alexander Fyodorov
2013-08-22 1:04 ` Waiman Long
2013-08-22 13:28 ` Alexander Fyodorov
2013-08-26 20:14 ` Waiman Long
2013-08-27 12:09 ` Alexander Fyodorov
[not found] ` <20130827091436.3d5971a0@gandalf.local.home>
2013-08-27 13:53 ` Peter Zijlstra
2013-08-28 1:21 ` Paul E. McKenney
2013-08-28 8:19 ` Peter Zijlstra
2013-08-28 12:59 ` Steven Rostedt
2013-08-28 13:05 ` Peter Zijlstra [this message]
2013-08-28 13:15 ` Steven Rostedt
2013-08-28 13:37 ` Peter Zijlstra
2013-08-29 15:24 ` Waiman Long
2013-08-29 17:03 ` Alexander Fyodorov
2013-08-30 3:16 ` Waiman Long
2013-08-30 8:15 ` Alexander Fyodorov
2013-08-13 18:41 [PATCH RFC v2 0/2] qspinlock: Introducing a 4-byte queue spinlock Waiman Long
2013-08-13 18:41 ` [PATCH RFC v2 1/2] qspinlock: Introducing a 4-byte queue spinlock implementation Waiman Long
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