From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759456AbXGDUtt (ORCPT ); Wed, 4 Jul 2007 16:49:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755485AbXGDUtk (ORCPT ); Wed, 4 Jul 2007 16:49:40 -0400 Received: from www.osadl.org ([213.239.205.134]:48729 "EHLO mail.tglx.de" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1755307AbXGDUtj (ORCPT ); Wed, 4 Jul 2007 16:49:39 -0400 Subject: v2.6.21.5-rt19 From: Thomas Gleixner To: LKML Cc: RT-Users , Ingo Molnar , Steven Rostedt , Fernando Lopez-Lezcano , "jcaceres@ccrma.Stanford.EDU" , Carsten Emde Content-Type: text/plain Date: Wed, 04 Jul 2007 22:49:15 +0200 Message-Id: <1183582155.3291.160.camel@chaos> Mime-Version: 1.0 X-Mailer: Evolution 2.10.1 (2.10.1-4.fc7) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I'm pleased to announce the v2.6.21.5-rt19 kernel on behalf of Ingo. It can be downloaded from the usual place: http://people.redhat.com/mingo/realtime-preempt/ More info about the -rt patch set can be found in the RT wiki: http://rt.wiki.kernel.org Changes since 2.6.21.5-rt18: - Fixed a nasty and hard to track down slowness / boot problem on SMP machines with CONFIG_NOHZ enabled. The problem was caused by the timer wheel base lock held during the get_next_timer_interrupt() call in the idle path, which eventually led to a bogus PI boosting of the idle task and in consequence a stale wrong scheduler selection for the affected idle task. Kudos to Carsten Emde, who patiently and meticulously isolated the problem and provided the traces, which allowed to identify the root cause. Problem solution: Prevent idle task boosting - back port of the ntp / clock_was_set fix - integration of the processor_idle fix from Venki Pallipadi, which resolves boot issues on some platforms - ep93xx clock events fix from Manfred Gruber To build a 2.6.21.5-rt19 tree, the following patches should be applied: http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.21.5.tar.bz2 http://people.redhat.com/mingo/realtime-preempt/patch-2.6.21.5-rt19 Thanks, tglx