From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 B4B60C43331 for ; Fri, 27 Mar 2020 08:49:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D60620714 for ; Fri, 27 Mar 2020 08:49:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726612AbgC0ItM (ORCPT ); Fri, 27 Mar 2020 04:49:12 -0400 Received: from mga04.intel.com ([192.55.52.120]:4873 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725946AbgC0ItL (ORCPT ); Fri, 27 Mar 2020 04:49:11 -0400 IronPort-SDR: 0zOHc5cFIwsiV1I9Eb4FjGl29QIwnANvY2PBq6/7ZGHXOxoxM4q9LANs2/slq7VbnkzSpa1AHK +qKw/pvsuCvQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Mar 2020 01:49:11 -0700 IronPort-SDR: EWtP0uuIemIMexIyJ1rR3Cv6Vyxrtoz3vma1Hir5BHUhgAyksLnYh0psTOLB61hv9goEVK9e6E zwaFsZqT6KiQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,311,1580803200"; d="scan'208";a="448940271" Received: from linux.intel.com ([10.54.29.200]) by fmsmga006.fm.intel.com with ESMTP; 27 Mar 2020 01:49:11 -0700 Received: from [10.249.36.56] (abudanko-mobl.ccr.corp.intel.com [10.249.36.56]) by linux.intel.com (Postfix) with ESMTP id 1E06A5803E3; Fri, 27 Mar 2020 01:49:08 -0700 (PDT) Subject: [PATCH v1 5/8] perf docs: extend stat mode docs with info on --ctl-fd[-ack] options From: Alexey Budankov To: Arnaldo Carvalho de Melo Cc: Jiri Olsa , Namhyung Kim , Alexander Shishkin , Peter Zijlstra , Ingo Molnar , Andi Kleen , linux-kernel References: <825a5132-b58d-c0b6-b050-5a6040386ec7@linux.intel.com> Organization: Intel Corp. Message-ID: <6dab86f5-403a-e280-d66e-20dd02ea4ec2@linux.intel.com> Date: Fri, 27 Mar 2020 11:49:07 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <825a5132-b58d-c0b6-b050-5a6040386ec7@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Extend perf-stat.txt file with --ctl-fd[-ack] options description. Document possible usage model introduced by --ctl-fd[-ack] options by providing example bash shell script. Signed-off-by: Alexey Budankov --- tools/perf/Documentation/perf-stat.txt | 38 ++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 4d56586b2fb9..a8a279ff9cb2 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -164,6 +164,44 @@ with it. --append may be used here. Examples: 3>results perf stat --log-fd 3 -- $cmd 3>>results perf stat --log-fd 3 --append -- $cmd +--ctl-fd:: +--ctl-fd-ack:: + +Listen on ctl-fd descriptor for command to control measurement ('r': resume, 'p': pause). +Optionally send control command completion ('a') to fd-ack descriptor to synchronize with +the controlling process. Example of bash shell script to resume and pause measurements: +#!/bin/bash + +ctl_dir=/tmp/ + +ctl_fifo=${ctl_dir}perf_ctl.fifo +test -p ${ctl_fifo} && unlink ${ctl_fifo} +mkfifo ${ctl_fifo} +exec {ctl_fd}<>${ctl_fifo} + +ctl_ack_fifo=${ctl_dir}perf_ctl_ack.fifo +test -p ${ctl_ack_fifo} && unlink ${ctl_ack_fifo} +mkfifo ${ctl_ack_fifo} +exec {ctl_fd_ack}<>${ctl_ack_fifo} + +perf stat -D -1 -e cpu-cycles -a -I 1000 \ + --ctl-fd ${ctl_fd} --ctl-fd-ack ${ctl_fd_ack} \ + -- sleep 30 & +perf_pid=$! + +sleep 5 && echo 'r' >&${ctl_fd} && read -u ${ctl_fd_ack} r1 && echo "resumed(${r1})" +sleep 10 && echo 'p' >&${ctl_fd} && read -u ${ctl_fd_ack} p1 && echo "paused(${p1})" + +exec {ctl_fd_ack}>&- +unlink ${ctl_ack_fifo} + +exec {ctl_fd}>&- +unlink ${ctl_fifo} + +wait -n ${perf_pid} +exit $? + + --pre:: --post:: Pre and post measurement hooks, e.g.: -- 2.24.1