From: "Paul E. McKenney" <paulmck@us.ibm.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Alan Stern <stern@rowland.harvard.edu>,
David Howells <dhowells@redhat.com>,
Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: Uses for memory barriers
Date: Tue, 19 Sep 2006 12:36:05 -0700 [thread overview]
Message-ID: <20060919193604.GI1310@us.ibm.com> (raw)
In-Reply-To: <45103B8D.1040006@yahoo.com.au>
On Wed, Sep 20, 2006 at 04:48:45AM +1000, Nick Piggin wrote:
> Paul E. McKenney wrote:
> >On Wed, Sep 20, 2006 at 03:51:29AM +1000, Nick Piggin wrote:
>
> >>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.
> >
> >
> >We are discussing multiple writes to the same variable, correct?
> >
> >Just checking...
>
> Correct.
I am having a hard time seeing how this would happen.
Sooner or later, the cacheline comes to the store queue, defining
the ordering. All changes that occurred in the store queue while
waiting for the cache line appear to other CPUs as having happened
in very quick succession while the cacheline resides with the store
queue in question.
So, what am I missing?
Thanx, Paul
next prev parent reply other threads:[~2006-09-19 19:35 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
2006-09-19 18:19 ` Paul E. McKenney
2006-09-19 18:48 ` Nick Piggin
2006-09-19 19:36 ` Paul E. McKenney [this message]
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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