Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932329AbWBURJ2 (ORCPT ); Tue, 21 Feb 2006 12:09:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932332AbWBURJ2 (ORCPT ); Tue, 21 Feb 2006 12:09:28 -0500 Received: from e34.co.us.ibm.com ([32.97.110.152]:10939 "EHLO e34.co.us.ibm.com") by vger.kernel.org with ESMTP id S932329AbWBURJ1 (ORCPT ); Tue, 21 Feb 2006 12:09:27 -0500 Subject: Re: 2.6.15-rt17 From: "Timothy R. Chavez" To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Esben Nielsen , Thomas Gleixner , Steven Rostedt In-Reply-To: <20060221155548.GA30146@elte.hu> References: <20060221155548.GA30146@elte.hu> Content-Type: text/plain Organization: IBM Date: Tue, 21 Feb 2006 11:23:40 -0600 Message-Id: <1140542620.21876.1.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.2.1.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2541 Lines: 66 On Tue, 2006-02-21 at 16:55 +0100, Ingo Molnar wrote: > i have released the 2.6.15-rt17 tree, which can be downloaded from the > usual place: > > http://redhat.com/~mingo/realtime-preempt/ > > lots of changes all across the map. There are several bigger changes: > > the biggest change is the new PI code from Esben Nielsen, Thomas > Gleixner and Steven Rostedt. This big rework simplifies and streamlines > the PI code, and fixes a couple of bugs and races: > > - only the top priority waiter on a lock is enqueued into the pi_list > of the task which holds the lock. No more pi list walking in the > boost case. > > - simpler locking rules > > - fast Atomic acquire for the non contended case and atomic release > for non waiter case is fully functional now > > - use task_t references instead of thread_info pointers > > - BKL handling for semaphore style locks changed so that BKL is > dropped before the scheduler is entered and reaquired in the return > path. This solves a possible deadlock situation in the BKL reacquire > path of the scheduler. > > another change is the reworking of the SLAB code: it now closely matches > the upstream SLAB code, and it should now work on NUMA systems too > (untested though). > > the tasklet code was reworked too to be PREEMPT_RT friendly: the new PI > code unearthed a fundamental livelock scenario with PREEMPT_RT, and the > fix was to rework the tasklet code to get rid of the 'retrigger > softirqs' approach. > > other changes: various hrtimers fixes, latency tracer enhancements - and > more. (Robust-futexes are not expected to work in this release.) > > please report any new breakages, and re-report any old breakages as > well. > > to build a 2.6.15-rt17 tree, the following patches should be applied: > > http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.15.tar.bz2 > http://redhat.com/~mingo/realtime-preempt/patch-2.6.15-rt17 http://people.redhat.com/mingo/realtime-preempt/patch-2.6.16-rt17 ??? -tim > > 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/ > - 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/