From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261878AbVFGTmB (ORCPT ); Tue, 7 Jun 2005 15:42:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261893AbVFGTmB (ORCPT ); Tue, 7 Jun 2005 15:42:01 -0400 Received: from mx2.elte.hu ([157.181.151.9]:58568 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S261878AbVFGTlz (ORCPT ); Tue, 7 Jun 2005 15:41:55 -0400 Date: Tue, 7 Jun 2005 21:41:19 +0200 From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: Esben Nielsen , Michal Schmidt , Steven Rostedt Subject: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.47-29 Message-ID: <20050607194119.GA11185@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 i have released the -V0.7.47-29 Real-Time Preemption patch, which can be downloaded from the usual place: http://redhat.com/~mingo/realtime-preempt/ it's a fixes and speedups release. Changes since -47-20: - x64 fixes (Michal Schmidt) - cpufreq fix (Esben Nielsen) - CONFIG_RT_DEADLOCK_DETECT build fix (Michal Schmidt) - MAX_USER_RT_PRIO fix (Steven Rostedt) there are more microoptimizations to the spin_lock/unlock hotpath: - the caching of mutex_getprio() priority in p->normal_prio - the mutex lock/unlock paths are now all fall-through. (Found a gcc bug, it mishandles __builtin_expect() in certain cases and produces correct but suboptimal code - we are working it around now.) - reduced the amount of recursive preemption-counter bumps via the use of raw spinlocks - rely on the preemption-counter instead of IRQs-off sections These changes brought the PREEMPT_RT overhead significantly down on hackbench workloads (clearly a worst-case test for PREEMPT_RT overhead). Would be interesting to see what kind of system time overhead PREEMPT_RT now causes for e.g. jack_test workloads. to build a -V0.7.47-29 tree, the following patches should to be applied: http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.11.tar.bz2 http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6.12-rc6.bz2 http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.12-rc6-V0.7.47-29 Ingo