From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757085AbcAJPzL (ORCPT ); Sun, 10 Jan 2016 10:55:11 -0500 Received: from plane.gmane.org ([80.91.229.3]:55664 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755758AbcAJPzK (ORCPT ); Sun, 10 Jan 2016 10:55:10 -0500 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Alexander Hirsch <1zeeky@gmail.com> Subject: Re: blog post: Monitoring real-time latencies Date: Sun, 10 Jan 2016 15:51:53 +0000 (UTC) Message-ID: References: <20160106220428.GA16537@sinkpad.home.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: sea.gmane.org User-Agent: Loom/3.14 (http://gmane.org/) X-Loom-IP: 88.69.61.215 (Mozilla/5.0 (X11; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/43.0) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Julien Desfossez efficios.com> writes: > > Hi, > > Here is a blog post related to detecting and understanding high > interrupt-processing latencies on real-time systems. It is based on a > new project called latency_tracker that hooks on the existing kernel > tracepoints and executes actions when high latency events occur. > > https://lttng.org/blog/2016/01/06/monitoring-realtime-latencies/ > > It is a work in progress, so if you are interested and/or have any > comments, please let me know. > > Thanks, > > Julien > Building lttng-modules 2.7.1 against linux-rt-4.1.15-rt17 (the most recent releases respectively, except for linux-rt-4.4-rc*) fails because of the patch introducing the sched_waking tracepoint to linux-rt (sched-introduce-the-27trace_sched_waking-27-tracepoint.patch), which also updates the sched_wakeup and sched_wakeup_template function prototypes to linux-4.3. The check for LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0) in the instrumentation by lttng-modules (instrumentation/events/lttng-module/sched.h) fails of course. Regards, Alexander Hirsch