From owner-freebsd-arch  Sat Dec 29 12:16:45 2001
Delivered-To: freebsd-arch@freebsd.org
Received: from apollo.backplane.com (apollo.backplane.com [216.240.41.2])
	by hub.freebsd.org (Postfix) with ESMTP
	id 07B8C37B421; Sat, 29 Dec 2001 12:16:36 -0800 (PST)
Received: (from dillon@localhost)
	by apollo.backplane.com (8.11.6/8.9.1) id fBTKGWR01735;
	Sat, 29 Dec 2001 12:16:32 -0800 (PST)
	(envelope-from dillon)
Date: Sat, 29 Dec 2001 12:16:32 -0800 (PST)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <200112292016.fBTKGWR01735@apollo.backplane.com>
To: John Baldwin <jhb@FreeBSD.ORG>
Cc: Michal Mertl <mime@traveller.cz>, arch@FreeBSD.ORG,
	John Hanley <jh_@yahoo.com>, Alfred Perlstein <bright@mu.org>,
	Mike Smith <msmith@FreeBSD.ORG>
Subject: Re: 64 bit counters
References:  <XFMail.011228232818.jhb@FreeBSD.org>
Sender: owner-freebsd-arch@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-arch.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-arch>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-arch>
X-Loop: FreeBSD.ORG

:You can use cmpxchg8b on SMP systems (it's available on all machines that
:support SMP I think) and use non-SMP versions otherwise where needed.  You
:would just implement the atomic_foo_64 versions this way.  You would need to
:use cmpxchg8b instead of addl/adcl for the acq and rel variants for SMP.
:
:-- 
:
:John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
:"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/

    This seems quite reasonable to me.

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-arch" in the body of the message