Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268698AbUJUMQB (ORCPT ); Thu, 21 Oct 2004 08:16:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269070AbUJUMOX (ORCPT ); Thu, 21 Oct 2004 08:14:23 -0400 Received: from mail.timesys.com ([65.117.135.102]:3717 "EHLO exchange.timesys.com") by vger.kernel.org with ESMTP id S268766AbUJUMAq (ORCPT ); Thu, 21 Oct 2004 08:00:46 -0400 Message-ID: <4177A49E.3060901@timesys.com> Date: Thu, 21 Oct 2004 07:59:26 -0400 From: john cooper User-Agent: Mozilla Thunderbird 0.8 (X11/20040913) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ingo Molnar CC: Thomas Gleixner , Jens Axboe , Rui Nuno Capela , LKML , Lee Revell , mark_h_johnson@raytheon.com, "K.R. Foley" , Bill Huey , Adam Heath , Florian Schmidt , Michal Schmidt , Fernando Pablo Lopez-Lezcano , john cooper Subject: Re: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U8 References: <20041018145008.GA25707@elte.hu> <20041019124605.GA28896@elte.hu> <20041019180059.GA23113@elte.hu> <20041020094508.GA29080@elte.hu> <30690.195.245.190.93.1098349976.squirrel@195.245.190.93> <1098350190.26758.24.camel@thomas> <20041021095344.GA10531@suse.de> <1098352441.26758.30.camel@thomas> <20041021101103.GC10531@suse.de> <1098353505.26758.38.camel@thomas> <20041021104222.GA8747@elte.hu> In-Reply-To: <20041021104222.GA8747@elte.hu> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 21 Oct 2004 11:55:34.0984 (UTC) FILETIME=[DFA32480:01C4B764] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 806 Lines: 31 Ingo Molnar wrote: >* Thomas Gleixner wrote: > > >>Yeah, for a semaphore it is, but not for a mutex. >> > >but mutexes dont exist in upstream Linux as a separate entity. (they >exist in my tree but that's another ballgame.) > Mutexes layered on existing semaphores seems convenient at the moment. However a more native mutex mechanism which tracks ownership would provide a basis for PI as well as further instrumentation. This may not be an issue at the present but I don't think it is too far off. -john -- john.cooper@timesys.com - 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/