From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261205AbVFJUQ0 (ORCPT ); Fri, 10 Jun 2005 16:16:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261206AbVFJUQ0 (ORCPT ); Fri, 10 Jun 2005 16:16:26 -0400 Received: from opersys.com ([64.40.108.71]:32525 "EHLO www.opersys.com") by vger.kernel.org with ESMTP id S261205AbVFJUQW (ORCPT ); Fri, 10 Jun 2005 16:16:22 -0400 Message-ID: <42A9F788.2040107@opersys.com> Date: Fri, 10 Jun 2005 16:26:48 -0400 From: Karim Yaghmour Reply-To: karim@opersys.com Organization: Opersys inc. User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040805 Netscape/7.2 X-Accept-Language: en-us, en, fr, fr-be, fr-ca, fr-fr MIME-Version: 1.0 To: "Bill Huey (hui)" CC: Andrea Arcangeli , "Paul E. McKenney" , Lee Revell , Tim Bird , linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@elte.hu, pmarques@grupopie.com, bruce@andrew.cmu.edu, nickpiggin@yahoo.com.au, ak@muc.de, sdietrich@mvista.com, dwalker@mvista.com, hch@infradead.org, akpm@osdl.org Subject: Re: Attempted summary of "RT patch acceptance" thread References: <20050608022646.GA3158@us.ibm.com> <42A8D1F3.8070408@am.sony.com> <20050609235026.GE1297@us.ibm.com> <1118372388.32270.6.camel@mindpipe> <20050610154745.GA1300@us.ibm.com> <20050610173728.GA6564@g5.random> <20050610193926.GA19568@nietzsche.lynx.com> In-Reply-To: <20050610193926.GA19568@nietzsche.lynx.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Bill Huey (hui) wrote: > LynxOS is a hard real time OS similar to how the preemption patch works > in that it's a single kernel system. It's gets those times regularly and > is obviously deterministic because of careful coding conventions just like > it has always been. Single kernel determinism is not new. It's only new > to you. Bill, I know PREEMPT_RT is something you root for strongly. FWIW, however, such statements are usually counter-productive. The existence of real-time monolithic kernels is not disputed. Note, though, that LynxOS is controlled by a single corporation and its development model could not be compared in any way to Linux. Because of Linux's development model, what others are attempting to explain (Andrea included, I think), the reality is that the auditing/upgrading you speak of is unlikely to ever become part of the development philosophy. I don't contest the fact that those promoting PREEMPT_RT intend to conduct this auditing for the drivers that are of interest to their development. That, though, doesn't mean that those who are maintaining existing driver sets want to take part in that. Karim -- Author, Speaker, Developer, Consultant Pushing Embedded and Real-Time Linux Systems Beyond the Limits http://www.opersys.com || karim@opersys.com || 1-866-677-4546