Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262105AbVEXQDh (ORCPT ); Tue, 24 May 2005 12:03:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262116AbVEXQBW (ORCPT ); Tue, 24 May 2005 12:01:22 -0400 Received: from mx1.elte.hu ([157.181.1.137]:55241 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S262112AbVEXP4l (ORCPT ); Tue, 24 May 2005 11:56:41 -0400 Date: Tue, 24 May 2005 17:56:19 +0200 From: Ingo Molnar To: Nick Piggin Cc: "K.R. Foley" , Christoph Hellwig , Daniel Walker , linux-kernel@vger.kernel.org, akpm@osdl.org, sdietrich@mvista.com Subject: Re: RT patch acceptance Message-ID: <20050524155619.GA21570@elte.hu> References: <1116890066.13086.61.camel@dhcp153.mvista.com> <20050524054722.GA6160@infradead.org> <20050524064522.GA9385@elte.hu> <4292DFC3.3060108@yahoo.com.au> <20050524081517.GA22205@elte.hu> <4292E559.3080302@yahoo.com.au> <42930E79.1030305@cybsft.com> <42934674.30406@yahoo.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <42934674.30406@yahoo.com.au> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1213 Lines: 27 * Nick Piggin wrote: > Well, yes. There are lots of things Linux isn't suited for. There are > likewise a lot of patches that SGI would love to get into the kernel > so it runs better on their 500+ CPU systems. [...] this reminds me. PREEMPT_RT found a handful of SMP races that not even 100+ CPU systems triggered in any deterministic way. (I have mentioned this before but it seems worth repeating: the preemption model of PREEMPT_RT is similar to a SMP Linux kernel running on an system that has an 'infinite' number of CPUs. Each task can be thought of having its own separate CPU - and SMP-alike instruction overlap can happen at any instruction boundary.) So the very small meets (and helps) the very large in interesting ways. PREEMPT_RT very much depends on a good SMP implementation and on a good CONFIG_PREEMPT implementation. The synergies are much wider than just enabling deterministic behavior in embedded systems. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/