From: Peter Zijlstra <peterz@infradead•org>
To: Will Deacon <will.deacon@arm•com>
Cc: "Paul E. McKenney" <paulmck@linux•vnet.ibm.com>,
Michael Ellerman <mpe@ellerman•id.au>,
linux-arch@vger•kernel.org, linux-kernel@vger•kernel.org,
Boqun Feng <boqun.feng@gmail•com>,
Anton Blanchard <anton@samba•org>,
Benjamin Herrenschmidt <benh@kernel•crashing.org>,
Paul Mackerras <paulus@samba•org>,
linuxppc-dev@lists•ozlabs.org
Subject: Re: [PATCH v2] barriers: introduce smp_mb__release_acquire and update documentation
Date: Fri, 9 Oct 2015 13:13:28 +0200 [thread overview]
Message-ID: <20151009111328.GA3816@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20151009094039.GD26278@arm.com>
On Fri, Oct 09, 2015 at 10:40:39AM +0100, Will Deacon wrote:
>
> > - RELEASE -> ACQUIRE _chains_ (on shared variables) preserve causality,
> > (because each link is fully ordered) but are not transitive.
>
> Yup, and that's the same for UNLOCK -> LOCK, too.
Agreed, except RELEASE/ACQUIRE is more RCpc than UNLOCK/LOCK.
IFF we can get UNLOCK/LOCK as RCsc the chains are strongly transitive,
unlike the RELEASE/ACQUIRE chains, which will be weakly so.
next prev parent reply other threads:[~2015-10-09 11:13 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1444215568-24732-1-git-send-email-will.deacon@arm.com>
[not found] ` <20151007111915.GF17308@twins.programming.kicks-ass.net>
[not found] ` <20151007132317.GK16065@arm.com>
[not found] ` <20151007152501.GI3910@linux.vnet.ibm.com>
2015-10-08 3:50 ` [PATCH v2] barriers: introduce smp_mb__release_acquire and update documentation Michael Ellerman
2015-10-08 11:16 ` Peter Zijlstra
2015-10-08 12:59 ` Will Deacon
2015-10-08 22:17 ` Paul E. McKenney
2015-10-09 9:51 ` Will Deacon
2015-10-09 11:25 ` Peter Zijlstra
2015-10-09 17:44 ` Paul E. McKenney
2015-10-09 17:43 ` Paul E. McKenney
2015-10-09 18:33 ` Will Deacon
2015-10-12 23:30 ` Paul E. McKenney
2015-10-20 14:20 ` Boqun Feng
2015-10-08 21:44 ` Paul E. McKenney
2015-10-09 7:29 ` Peter Zijlstra
2015-10-09 8:31 ` Peter Zijlstra
2015-10-09 9:40 ` Will Deacon
2015-10-09 11:02 ` Peter Zijlstra
2015-10-09 12:41 ` Will Deacon
2015-10-09 11:12 ` Peter Zijlstra
2015-10-09 12:51 ` Will Deacon
2015-10-09 13:06 ` Peter Zijlstra
2015-10-09 11:13 ` Peter Zijlstra [this message]
2015-10-09 17:21 ` Paul E. McKenney
2015-10-19 1:17 ` Boqun Feng
2015-10-19 10:23 ` Peter Zijlstra
2015-10-20 7:35 ` Boqun Feng
2015-10-20 23:34 ` Paul E. McKenney
2015-10-21 8:24 ` Peter Zijlstra
2015-10-21 19:29 ` Paul E. McKenney
2015-10-21 19:36 ` Peter Zijlstra
2015-10-21 19:56 ` Paul E. McKenney
2015-10-21 16:04 ` David Laight
2015-10-21 19:34 ` Paul E. McKenney
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