Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262726AbVCPSWM (ORCPT ); Wed, 16 Mar 2005 13:22:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262727AbVCPSWM (ORCPT ); Wed, 16 Mar 2005 13:22:12 -0500 Received: from mustang.oldcity.dca.net ([216.158.38.3]:37787 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S262726AbVCPSV7 (ORCPT ); Wed, 16 Mar 2005 13:21:59 -0500 Subject: Re: [patch] Real-Time Preemption, -RT-2.6.11-rc3-V0.7.38-01 From: Lee Revell To: rostedt@goodmis.org Cc: Ingo Molnar , Andrew Morton , linux-kernel@vger.kernel.org In-Reply-To: References: <1110574019.19093.23.camel@mindpipe> <1110578809.19661.2.camel@mindpipe> <20050315120053.GA4686@elte.hu> <20050315133540.GB4686@elte.hu> <1110913778.17931.2.camel@mindpipe> Content-Type: text/plain Date: Wed, 16 Mar 2005 13:21:58 -0500 Message-Id: <1110997318.21212.8.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1414 Lines: 35 On Wed, 2005-03-16 at 02:50 -0500, Steven Rostedt wrote: > > On Tue, 15 Mar 2005, Lee Revell wrote: > > > On Tue, 2005-03-15 at 13:05 -0500, Steven Rostedt wrote: > > > Damn! The answer was right there in front of my eyes! Here's the cleanest > > > solution. I forgot about wait_on_bit_lock. I've converted all the locks > > > to use this instead. We probably need to get priority inheritence working > > > on this too someday, but for now it's better than wasting memory or > > > getting into deadlocks. > > > > > > > I am still not clear on why this did not hit with earlier kernels + > > PREEMPT_DESKTOP. Were the bitlocks introduced recently? Or was another > > lock-break patch dropped? > > > > When did you start seeing this? This code has been there as far back as > 2.6.7 (the earliest 2.6 kernel I still have laying around) and as far > back as Ingo's realtime-preempt-2.6.9-mm1-U10. Maybe the tracing didn't > start picking this up till later, or that you were just lucky that no > contention was happening on that lock. Sometime after the RT preempt patches were rebased to mainline. I don't see how there could be contention as I am on a UP. Lee - 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/