From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Will Deacon <will.deacon@arm.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>, Oleg Nesterov <oleg@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
boqun.feng@gmail.com, Jonathan Corbet <corbet@lwn.net>,
Michal Hocko <mhocko@kernel.org>,
David Howells <dhowells@redhat.com>
Subject: Re: [PATCH 4/4] locking: Introduce smp_cond_acquire()
Date: Tue, 3 Nov 2015 19:57:00 -0800 [thread overview]
Message-ID: <20151104035700.GN29027@linux.vnet.ibm.com> (raw)
In-Reply-To: <CA+55aFyJJGaW2RpvDkEjgbd1dYpLNzF7n+QUxkbFdNiCf_xgDg@mail.gmail.com>
On Tue, Nov 03, 2015 at 11:40:24AM -0800, Linus Torvalds wrote:
> On Mon, Nov 2, 2015 at 5:57 PM, Paul E. McKenney
> <paulmck@linux.vnet.ibm.com> wrote:
[ . . . ]
> > I am in India and my Alpha Architecture Manual is in the USA.
>
> I sent you a link to something that should work, and that has the section.
Thank you, and yes, it clearly states that read-to-write dependencies
are ordered. Color me slow and stupid.
> > And they did post a clarification on the web:
>
> So for alpha, you trust a random web posting by a unknown person that
> talks about some random problem in an application that we don't even
> know what it is.
In my defense, the Alpha architects pointed me at that web posting, but
yes, it appears to be pushing for overly conservative safety rather than
accuracy. Please accept my apologies for my confusion.
Thanx, Paul
next prev parent reply other threads:[~2015-11-04 3:57 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-02 13:29 [PATCH 0/4] scheduler ordering bits Peter Zijlstra
2015-11-02 13:29 ` [PATCH 1/4] sched: Better document the try_to_wake_up() barriers Peter Zijlstra
2015-12-04 0:09 ` Byungchul Park
2015-12-04 0:58 ` Byungchul Park
2015-11-02 13:29 ` [PATCH 2/4] sched: Document Program-Order guarantees Peter Zijlstra
2015-11-02 20:27 ` Paul Turner
2015-11-02 20:34 ` Peter Zijlstra
2015-11-02 22:09 ` Paul Turner
2015-11-02 22:12 ` Peter Zijlstra
2015-11-20 10:02 ` Peter Zijlstra
2015-11-20 14:08 ` Boqun Feng
2015-11-20 14:18 ` Peter Zijlstra
2015-11-20 14:21 ` Boqun Feng
2015-11-20 19:41 ` Peter Zijlstra
2015-11-02 13:29 ` [PATCH 3/4] sched: Fix a race in try_to_wake_up() vs schedule() Peter Zijlstra
2015-11-02 13:29 ` [PATCH 4/4] locking: Introduce smp_cond_acquire() Peter Zijlstra
2015-11-02 13:57 ` Peter Zijlstra
2015-11-02 17:43 ` Will Deacon
2015-11-03 1:14 ` Paul E. McKenney
2015-11-03 1:25 ` Linus Torvalds
2015-11-02 17:42 ` Will Deacon
2015-11-02 18:08 ` Linus Torvalds
2015-11-02 18:37 ` Will Deacon
2015-11-02 19:17 ` Linus Torvalds
2015-11-02 19:57 ` Will Deacon
2015-11-02 20:23 ` Peter Zijlstra
2015-11-02 21:56 ` Peter Zijlstra
2015-11-03 1:57 ` Paul E. McKenney
2015-11-03 19:40 ` Linus Torvalds
2015-11-04 3:57 ` Paul E. McKenney [this message]
2015-11-04 4:43 ` Linus Torvalds
2015-11-04 12:54 ` Paul E. McKenney
2015-11-02 20:36 ` David Howells
2015-11-02 20:40 ` Peter Zijlstra
2015-11-02 21:11 ` Linus Torvalds
2015-11-03 17:59 ` Oleg Nesterov
2015-11-03 18:23 ` Peter Zijlstra
2015-11-11 9:39 ` Boqun Feng
2015-11-11 10:34 ` Boqun Feng
2015-11-11 19:53 ` Oleg Nesterov
2015-11-12 13:50 ` Paul E. McKenney
2015-11-11 12:12 ` Peter Zijlstra
2015-11-11 19:39 ` Oleg Nesterov
2015-11-11 21:23 ` Linus Torvalds
2015-11-12 7:14 ` Boqun Feng
2015-11-12 10:28 ` Peter Zijlstra
2015-11-12 15:00 ` Oleg Nesterov
2015-11-12 14:40 ` Paul E. McKenney
2015-11-12 14:49 ` Boqun Feng
2015-11-12 15:02 ` Paul E. McKenney
2015-11-12 21:53 ` Will Deacon
2015-11-12 14:50 ` Peter Zijlstra
2015-11-12 15:01 ` Paul E. McKenney
2015-11-12 15:08 ` Peter Zijlstra
2015-11-12 15:20 ` Paul E. McKenney
2015-11-12 21:25 ` Will Deacon
2015-11-12 15:18 ` Boqun Feng
2015-11-12 18:38 ` Oleg Nesterov
2015-11-12 18:02 ` Peter Zijlstra
2015-11-12 19:33 ` Oleg Nesterov
2015-11-12 18:59 ` Paul E. McKenney
2015-11-12 21:33 ` Will Deacon
2015-11-12 23:43 ` Paul E. McKenney
2015-11-16 13:58 ` Will Deacon
2015-11-12 18:21 ` Linus Torvalds
2015-11-12 22:09 ` Will Deacon
2015-11-16 15:56 ` Peter Zijlstra
2015-11-16 16:04 ` Peter Zijlstra
2015-11-16 16:24 ` Will Deacon
2015-11-16 16:44 ` Paul E. McKenney
2015-11-16 16:46 ` Will Deacon
2015-11-16 17:15 ` Paul E. McKenney
2015-11-16 21:58 ` Linus Torvalds
2015-11-17 11:51 ` Will Deacon
2015-11-17 21:01 ` Paul E. McKenney
2015-11-18 11:25 ` Will Deacon
2015-11-19 18:01 ` Will Deacon
2015-11-20 10:09 ` Peter Zijlstra
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