From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756833AbcBQIOc (ORCPT ); Wed, 17 Feb 2016 03:14:32 -0500 Received: from krieglstein.org ([176.28.13.145]:46499 "EHLO lvps176-28-13-145.dedicated.hosteurope.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756766AbcBQIOa convert rfc822-to-8bit (ORCPT ); Wed, 17 Feb 2016 03:14:30 -0500 From: Tim Sander To: Sebastian Andrzej Siewior Cc: linux-rt-users , LKML , Thomas Gleixner , rostedt@goodmis.org, John Kacur Subject: Bisect results for 4.4.1-rt[4,5] Date: Wed, 17 Feb 2016 09:14:27 +0100 Message-ID: <6333508.b5IKNpgbEX@dabox> Organization: Sander and Lightning User-Agent: KMail/4.14.3 (Linux/4.4.0-00001-g95803be; KDE/4.14.13; x86_64; ; ) In-Reply-To: <56BDA0EF.7090503@linutronix.de> References: <20150816135630.GE7004@linutronix.de> <1614199.PesBpXyHut@dabox> <56BDA0EF.7090503@linutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT Content-Type: text/plain; charset="iso-8859-1" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sebastian Am Freitag, 12. Februar 2016, 10:07:59 schrieben Sie: ... > What about rt4? It is only the stable update so you should see here the > numbers from rt3. If that is true and your numbers are stable it should > be easy to run git bisect between rt4 and rt5. And looking at > https://git.kernel.org/rt/linux-rt-devel/h/v4.4.1-rt5 > the only non-cosmetic change in -rt5 that should affect you is the > migrate-disable fixup from Mike. I have done a bisect run, its a rather innocent looking on liner which seems to cause the problems. The numbers where reasonably stable so i am pretty confident that this is the patch giving ~26µs additional latency on the Altera SOC plattform: eec2bf477ac674583a7d73b9d00f47c528b7266d is the first bad commit commit eec2bf477ac674583a7d73b9d00f47c528b7266d Author: Sebastian Andrzej Siewior Date: Thu Feb 4 16:38:10 2016 +0100 kernel/perf: mark perf_cpu_context's timer as irqsafe Otherwise we get a WARN_ON() backtrace and some events are reported as "not counted". Cc: stable-rt@vger.kernel.org Reported-by: Yang Shi Signed-off-by: Sebastian Andrzej Siewior Here are the numbers of the bisect run for reference: ==> g0dd3bdd <== # Total: 100000000 099999829 # Min Latencies: 00010 00010 # Avg Latencies: 00020 00021 # Max Latencies: 00084 00101 # Histogram Overflows: 00000 00000 ==> gbbc7819 <== # Total: 100000000 099999798 # Min Latencies: 00010 00010 # Avg Latencies: 00021 00021 # Max Latencies: 00086 00091 # Histogram Overflows: 00000 00000 ==> geec2bf4 <== # Total: 099998713 100000000 # Min Latencies: 00010 00010 # Avg Latencies: 00020 00021 # Max Latencies: 00113 00070 # Histogram Overflows: 00000 00000 Best Regards Tim