From owner-freebsd-arch Sun Feb 17 12:39:20 2002 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 8DA0C37B402; Sun, 17 Feb 2002 12:39:17 -0800 (PST) Received: (from dillon@localhost) by apollo.backplane.com (8.11.6/8.9.1) id g1HKdDX91151; Sun, 17 Feb 2002 12:39:13 -0800 (PST) (envelope-from dillon) Date: Sun, 17 Feb 2002 12:39:13 -0800 (PST) From: Matthew Dillon Message-Id: <200202172039.g1HKdDX91151@apollo.backplane.com> To: Poul-Henning Kamp Cc: Terry Lambert , Julian Elischer , Alfred Perlstein , arch@FreeBSD.ORG, jhb@FreeBSD.ORG, peter@wemm.org, jake@locore.ca Subject: Re: gettimeofday() and crhold()/crfree() (was Re: gettimeofday()and copyout(). Is copyout() MPSAFE on non-i386 archs? ) References: <6008.1013977727@critter.freebsd.dk> Sender: owner-freebsd-arch@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG :with a special device driver). Provided that the process has acccess :to reading the timecounter (== not i8254) all the time-calculations :can be done in userland without any calls into the kernel. : :This was a design parameter for timecounters, I have just never :gotten around to commit the stuff. : :It is an optimization which I think is not quite needed yet and I :certainly have other things in my queue with higher priority right :now. : :-- :Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 I think we can safely say that all of this is in the 'still arguing about the design' stage. -Matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message