From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jesse Barnes <jesse.barnes@intel.com>, linux-kernel@vger.kernel.org
Subject: Re: Intel Memory Ordering White Paper
Date: Sun, 9 Sep 2007 03:34:27 +1000 [thread overview]
Message-ID: <200709090334.27677.nickpiggin@yahoo.com.au> (raw)
In-Reply-To: <alpine.LFD.0.999.0709080020040.9047@evo.linux-foundation.org>
On Saturday 08 September 2007 09:20, Linus Torvalds wrote:
> On Sat, 8 Sep 2007, Nick Piggin wrote:
> > So, can we finally noop smp_rmb and smp_wmb on x86?
>
> Did AMD already release their version? If so, we should probably add a
> commit that does that in somewhat early 2.6.24 rc, and add the pointers to
> the whitepapers in the commit message.
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/24593.pdf
AMD64 Architecture Programmer's Manual Volume 2: System Programming
section 7.2: Multiprocessor Memory Access Ordering, a paragraph on the
first page says
"Loads do not pass previous loads (loads are not re-ordered). Stores do
not pass previous stores (stores are not re-ordered)"
So, yes, it should be easy to do.
next prev parent reply other threads:[~2007-09-08 7:37 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-07 22:26 Jesse Barnes
2007-09-08 8:54 ` Nick Piggin
2007-09-07 23:20 ` Linus Torvalds
2007-09-08 17:34 ` Nick Piggin [this message]
2007-09-08 17:48 ` Nick Piggin
2007-09-07 18:13 ` Nick Piggin
2007-09-08 8:53 ` Andi Kleen
2007-09-07 19:57 ` Nick Piggin
2007-09-08 10:19 ` Andi Kleen
2007-09-07 20:32 ` Nick Piggin
2007-09-08 20:37 ` H. Peter Anvin
2007-09-08 11:34 ` dean gaudet
2007-09-08 12:08 ` Petr Vandrovec
2007-09-08 12:27 ` dean gaudet
2007-09-08 10:30 ` Alan Cox
2007-09-07 20:46 ` Nick Piggin
2007-09-08 10:29 ` Alan Cox
2007-09-07 20:49 ` Nick Piggin
2007-09-08 14:11 ` Alan Cox
2007-09-12 18:26 ` Dr. David Alan Gilbert
2007-09-19 16:26 ` Jesse Barnes
2007-09-19 17:29 ` Andi Kleen
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