From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261844AbULGPlH (ORCPT ); Tue, 7 Dec 2004 10:41:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261841AbULGPlH (ORCPT ); Tue, 7 Dec 2004 10:41:07 -0500 Received: from mx1.elte.hu ([157.181.1.137]:43438 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S261844AbULGPlA (ORCPT ); Tue, 7 Dec 2004 10:41:00 -0500 Date: Tue, 7 Dec 2004 16:37:20 +0100 From: Ingo Molnar To: Eran Mann Cc: linux-kernel@vger.kernel.org Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.32-2 Message-ID: <20041207153720.GA20712@elte.hu> References: <20041204175636.GA3115@elte.hu> <41B5C038.1090501@mrv.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <41B5C038.1090501@mrv.com> User-Agent: Mutt/1.4.1i 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, 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 * Eran Mann wrote: > On my machine, disabling CONFIG_LATENCY_TRACE causes the kernel to > stop reporting preempt latencies. After > > # echo 1 > /proc/sys/kernel/preempt_max_latency > > /proc/sys/kernel/preempt_max_latency always shows 1 no matter what > load is on the machine. I´ve seen this behavior since the first time I > tried to disable CONFIG_LATENCY_TRACE, around V0.7.31.something. indeed - there was a thinko in trace_stop_sched_switched() that likely caused this problem. Does the -32-8 patch (freshly uploaded) work better for you? Ingo