From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>,
David Howells <dhowells@redhat.com>,
Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: Uses for memory barriers
Date: Wed, 20 Sep 2006 03:51:29 +1000 [thread overview]
Message-ID: <45102E21.2060301@yahoo.com.au> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0609191332470.4345-100000@iolanthe.rowland.org>
Alan Stern wrote:
> On Wed, 20 Sep 2006, Nick Piggin wrote:
>>I don't think that need be the case if one of the CPUs that has written
>>the variable forwards the store to a subsequent load before it reaches
>>the cache coherency (I could be wrong here). So if that is the case, then
>>your above example would be correct.
>
>
> I don't understand your comment. Are you saying it's possible for two
> CPUs to observe the same two writes and see them occurring in opposite
> orders?
If store forwarding is able to occur outside cache coherency protocol,
then I don't see why not. I would also be interested to know if this
is the case on real systems.
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2006-09-19 17:51 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20060911190005.GA1295@us.ibm.com>
2006-09-12 18:08 ` Uses for memory barriers Alan Stern
2006-09-12 20:23 ` Paul E. McKenney
2006-09-14 14:58 ` Alan Stern
2006-09-15 5:16 ` Paul E. McKenney
2006-09-15 19:48 ` Alan Stern
2006-09-16 4:19 ` Paul E. McKenney
2006-09-16 15:28 ` Alan Stern
2006-09-18 19:13 ` Paul E. McKenney
2006-09-18 20:13 ` Alan Stern
2006-09-19 0:47 ` Paul E. McKenney
2006-09-19 16:04 ` Alan Stern
2006-09-19 16:38 ` Nick Piggin
2006-09-19 17:40 ` Alan Stern
2006-09-19 17:51 ` Nick Piggin [this message]
2006-09-19 18:19 ` Paul E. McKenney
2006-09-19 18:48 ` Nick Piggin
2006-09-19 19:36 ` Paul E. McKenney
2006-09-19 19:48 ` Nick Piggin
2006-09-19 20:01 ` Paul E. McKenney
2006-09-19 20:38 ` Alan Stern
2006-09-21 1:43 ` Paul E. McKenney
2006-09-19 18:16 ` Paul E. McKenney
2006-09-20 19:39 ` Alan Stern
2006-09-21 1:34 ` Paul E. McKenney
2006-09-21 20:59 ` Alan Stern
2006-09-22 5:02 ` Paul E. McKenney
2006-09-22 20:38 ` Alan Stern
2006-09-27 21:06 ` Alan Stern
2006-09-30 1:11 ` Paul E. McKenney
2006-09-30 21:01 ` Alan Stern
2006-10-02 0:06 ` Paul E. McKenney
2006-10-02 15:44 ` Alan Stern
2006-10-04 15:35 ` Paul E. McKenney
2006-10-04 18:04 ` Alan Stern
2006-10-13 16:51 ` Paul E. McKenney
2006-10-13 18:30 ` Alan Stern
2006-10-13 22:39 ` Paul E. McKenney
2006-10-14 2:27 ` Alan Stern
2006-10-17 1:24 ` Paul E. McKenney
2006-10-17 15:29 ` Alan Stern
2006-10-17 17:27 ` Paul E. McKenney
2006-10-17 19:42 ` Alan Stern
2006-10-17 20:15 ` Paul E. McKenney
2006-10-17 21:21 ` Alan Stern
2006-10-17 22:58 ` Paul E. McKenney
2006-10-18 19:05 ` Alan Stern
2006-10-18 23:01 ` Paul E. McKenney
2006-10-19 16:44 ` Alan Stern
2006-10-19 19:21 ` Paul E. McKenney
2006-10-19 20:55 ` Alan Stern
2006-10-19 22:46 ` Paul E. McKenney
2006-10-20 16:54 ` Alan Stern
2006-10-21 0:59 ` Paul E. McKenney
2006-10-21 19:47 ` Alan Stern
2006-10-21 22:52 ` Paul E. McKenney
2006-10-22 2:18 ` Alan Stern
2006-10-23 5:32 ` Paul E. McKenney
2006-10-23 14:07 ` Alan Stern
2006-10-24 17:52 ` Paul E. McKenney
[not found] <200609082230.22225.oliver@neukum.org>
2006-09-08 21:26 ` Alan Stern
2006-09-08 21:46 ` Oliver Neukum
2006-09-08 22:25 ` Alan Stern
2006-09-08 22:49 ` Oliver Neukum
2006-09-09 2:25 ` Alan Stern
2006-09-11 16:21 ` Paul E. McKenney
2006-09-11 16:50 ` Alan Stern
2006-09-11 17:23 ` Segher Boessenkool
2006-09-11 19:04 ` Paul E. McKenney
2006-09-11 19:03 ` Paul E. McKenney
2006-09-11 17:21 ` Segher Boessenkool
2006-09-11 19:48 ` Oliver Neukum
2006-09-11 20:29 ` Paul E. McKenney
2006-09-12 9:01 ` David Howells
2006-09-12 10:22 ` Oliver Neukum
2006-09-12 14:55 ` Paul E. McKenney
2006-09-12 15:07 ` Oliver Neukum
2006-09-12 16:12 ` Paul E. McKenney
2006-09-12 17:50 ` Segher Boessenkool
2006-09-12 14:42 ` Paul E. McKenney
2006-09-12 8:57 ` David Howells
[not found] <200609081929.33027.oliver@neukum.org>
2006-09-08 18:06 ` Alan Stern
2006-09-08 18:22 ` Oliver Neukum
2006-09-07 21:25 Alan Stern
2006-09-07 22:10 ` linux-os (Dick Johnson)
2006-09-08 18:39 ` Alan Stern
2006-09-08 0:14 ` Paul E. McKenney
2006-09-08 15:55 ` Alan Stern
2006-09-08 18:57 ` Paul E. McKenney
2006-09-08 21:23 ` Alan Stern
2006-09-09 0:44 ` Paul E. McKenney
2006-09-11 16:05 ` Alan Stern
2006-09-08 5:52 ` David Schwartz
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