Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262479AbUJ0PEp (ORCPT ); Wed, 27 Oct 2004 11:04:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262480AbUJ0PEp (ORCPT ); Wed, 27 Oct 2004 11:04:45 -0400 Received: from mx1.elte.hu ([157.181.1.137]:9961 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S262479AbUJ0PEi (ORCPT ); Wed, 27 Oct 2004 11:04:38 -0400 Date: Wed, 27 Oct 2004 17:05:48 +0200 From: Ingo Molnar To: "K.R. Foley" Cc: linux-kernel@vger.kernel.org, Lee Revell , Rui Nuno Capela , Mark_H_Johnson@Raytheon.com, Bill Huey , Adam Heath , Florian Schmidt , Thomas Gleixner , Michal Schmidt , Fernando Pablo Lopez-Lezcano , Andrew Morton Subject: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0 Message-ID: <20041027150548.GA11233@elte.hu> References: <20041022155048.GA16240@elte.hu> <20041022175633.GA1864@elte.hu> <20041025104023.GA1960@elte.hu> <417D4B5E.4010509@cybsft.com> <20041025203807.GB27865@elte.hu> <417E2CB7.4090608@cybsft.com> <20041027002455.GC31852@elte.hu> <417F16BB.3030300@cybsft.com> <20041027132926.GA7171@elte.hu> <417FB7F0.4070300@cybsft.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <417FB7F0.4070300@cybsft.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, 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 Content-Length: 889 Lines: 22 * K.R. Foley wrote: > I use the rtc-debug and amlat to generate histograms of latencies > which is what I was trying to do when I found the rtc problem the > first time. I believe that rtc-debug/amlat is much more accurate for > generating histograms of latencies than realfeel is because the > instrumentation is in the kernel rather than a userspace program. ah, ok - nice. So rtc-debug+amlat is the only known-reliable way to produce latency histograms? Btw., rtc-debug's latency results could now be cross-validated with -V0.4's wakeup tracer (and vice versa), because the two are totally independent mechanisms. 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/