From patchwork Fri Sep 17 15:43:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Bristot de Oliveira X-Patchwork-Id: 12502689 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BBAFBC433F5 for ; Fri, 17 Sep 2021 15:47:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D758611C8 for ; Fri, 17 Sep 2021 15:47:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343887AbhIQPsm convert rfc822-to-8bit (ORCPT ); Fri, 17 Sep 2021 11:48:42 -0400 Received: from us-smtp-delivery-44.mimecast.com ([205.139.111.44]:21868 "EHLO us-smtp-delivery-44.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343928AbhIQPsF (ORCPT ); Fri, 17 Sep 2021 11:48:05 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-382-bRNVlaTgO-ytI1FEpmrPWw-1; Fri, 17 Sep 2021 11:46:38 -0400 X-MC-Unique: bRNVlaTgO-ytI1FEpmrPWw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 1E891101AFCC; Fri, 17 Sep 2021 15:46:37 +0000 (UTC) Received: from x1.bristot.me.homenet.telecomitalia.it (unknown [10.22.17.200]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2F1E05D9C6; Fri, 17 Sep 2021 15:46:34 +0000 (UTC) From: Daniel Bristot de Oliveira To: Steven Rostedt Cc: Jonathan Corbet , Kate Carcia , Daniel Bristot de Oliveira , Ingo Molnar , Tom Zanussi , Masami Hiramatsu , Juri Lelli , Clark Williams , Peter Zijlstra , Thomas Gleixner , Sebastian Andrzej Siewior , linux-rt-users@vger.kernel.org, linux-trace-devel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC 15/19] rtla: Add rtla osnoise top documentation Date: Fri, 17 Sep 2021 17:43:58 +0200 Message-Id: <6df2782bbf0055bd7552694b1d7cfb9b97d68328.1631889858.git.bristot@kernel.org> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=bristot@kernel.org X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org Man page for rtla osnoise top mode. Cc: Steven Rostedt Cc: Ingo Molnar Cc: Tom Zanussi Cc: Masami Hiramatsu Cc: Juri Lelli Cc: Clark Williams Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Sebastian Andrzej Siewior Cc: Daniel Bristot de Oliveira Cc: linux-rt-users@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira --- .../rtla/Documentation/rtla-osnoise-top.txt | 98 +++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 tools/tracing/rtla/Documentation/rtla-osnoise-top.txt diff --git a/tools/tracing/rtla/Documentation/rtla-osnoise-top.txt b/tools/tracing/rtla/Documentation/rtla-osnoise-top.txt new file mode 100644 index 000000000000..e4da5db422e8 --- /dev/null +++ b/tools/tracing/rtla/Documentation/rtla-osnoise-top.txt @@ -0,0 +1,98 @@ +rtla-osnoise-top(1) +=================== + +NAME +---- +rtla-osnoise-top - Display a summary of the operating system noise + +SYNOPSIS +-------- +*rtla osnoise top* ['OPTIONS'] + +DESCRIPTION +----------- +The rtla-osnoise-top(1) tool is an interface for the osnoise tracer. The +osnoise tracer dispatches a kernel thread per-cpu. These threads read the +time in a loop while with preemption, softirq and IRQs enabled, thus +allowing all the sources of osnoise during its execution. The osnoise's +tracer threads take note of the delta between each time read, along with +an interference counter for each source of interference. At the end of +each period, the osnoise tracer displays a summary of the results. + +*rtla osnoise top* collects the periodic summary from the osnoise tracer, +including the counters of the occurrence of the interference source, +displaying the results in a user-friendly format. + +The tool also allows many configurations of the osnoise tracer and the +collection of the tracer output. + +OPTIONS +------- +*-h*, *--help*:: +Print help menu. +*-p*, *--period* 'us':: +Set the osnoise tracer period in microseconds. +*-r*, *--runtime* 'us':: +Set the osnoise tracer runtime in microseconds. +*-s*, *--stop* 'us':: +Stop the trace if a single sample is higher than the argument in microseconds. +If -T is set, it will also save the trace to the output. +*-S*, *--stop-total* 'us':: +Stop the trace if the total sample is higher than the argument in microseconds. +If -T is set, it will also save the trace to the output. +*-c*, *--cpus* 'cpu-list':: +Set the osnoise tracer to run the sample threads in the cpu-list. +*-d*, *--duration* 'time[s|m|h|d]':: +Set the duration of the session. +*-T*, *--trace*['=file']:: +Save the stopped trace to ['file|osnoise_trace.txt']. +*-q*, *--quiet*:: +Print only a summary at the end of the session. +*-P*, *--priority* 'o:prio|r:prio|f:prio|d:runtime:period':: +Set scheduling parameters to the osnoise tracer threads, the format to set the priority are: + - 'o:prio' - use SCHED_OTHER with 'prio'; + - 'r:prio' - use SCHED_RR with 'prio'; + - 'f:prio' - use SCHED_FIFO with 'prio'; + - 'd:runtime[us|ms|s]:period[us|ms|s]' - use SCHED_DEADLINE with 'runtime' and 'period' in nanoseconds. + +EXAMPLE +------- +In the example below, the rtla osnoise top tool is set to run with a +real-time priority 'FIFO:1', on CPUs '0-3', for '900ms' at each period +('1s' by default). The reason for reducing the runtime is to avoid starving +the rtla tool. The tool is also set to run for 'one minute' and to display +a summary of the report at the end of the session. + +------------------------------------------------------- +[root@f34 ~]# rtla osnoise top -P F:1 -c 0-3 -r 900000 -d 1M -q + Operating System Noise +duration: 0 00:01:00 | time is in us +CPU Period Runtime Noise % CPU Aval Max Noise Max Single HW NMI IRQ Softirq Thread + 0 #59 53100000 304896 99.42580 6978 56 549 0 53111 1590 13 + 1 #59 53100000 338339 99.36282 8092 24 399 0 53130 1448 31 + 2 #59 53100000 290842 99.45227 6582 39 855 0 53110 1406 12 + 3 #59 53100000 204935 99.61405 6251 33 290 0 53156 1460 12 +------------------------------------------------------- + +SEE ALSO +-------- +_rtla-osnoise(1)_, _rtla-osnoise-hist_(1) + +Osnoise tracer documentation: + +AUTHOR +------ +Written by Daniel Bristot de Oliveira + +REPORTING BUGS +-------------- +Report bugs to + +LICENSE +------- +rtla is Free Software licensed under the GNU GPLv2 + +COPYING +------- +Copyright \(C) 2021 Red Hat, Inc. Free use of this software is granted under +the terms of the GNU Public License (GPL).