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 E1B91C28CBC for ; Wed, 6 May 2020 18:23:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BDF9520747 for ; Wed, 6 May 2020 18:23:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730383AbgEFSXA (ORCPT ); Wed, 6 May 2020 14:23:00 -0400 Received: from mga17.intel.com ([192.55.52.151]:56488 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729589AbgEFSW7 (ORCPT ); Wed, 6 May 2020 14:22:59 -0400 IronPort-SDR: CkL0C40dW3Qie5e9x2+niSsWj6R7i7l+Ut+c+/UHaV8qDuXlJW1bEr0SrxBIXTEL2a2b/aMVmG Q3IsdxN/X7wQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 May 2020 11:22:59 -0700 IronPort-SDR: jHEJIQ88DLuQwNUFUiHX3LTAT97MVx27mbbNCop4TdeOX+15ZPDF9BST2kmwMB2bMPF2fRi2sV pib/Z1PPKd6w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,360,1583222400"; d="scan'208";a="296269303" Received: from linux.intel.com ([10.54.29.200]) by orsmga008.jf.intel.com with ESMTP; 06 May 2020 11:22:59 -0700 Received: from [10.249.228.227] (abudanko-mobl.ccr.corp.intel.com [10.249.228.227]) by linux.intel.com (Postfix) with ESMTP id 413A258043A; Wed, 6 May 2020 11:22:57 -0700 (PDT) Subject: [PATCH v2 07/11] perf docs: extend stat mode docs with info on --ctl-fd[-ack] options From: Alexey Budankov To: Arnaldo Carvalho de Melo , Jiri Olsa Cc: Namhyung Kim , Alexander Shishkin , Peter Zijlstra , Ingo Molnar , Andi Kleen , linux-kernel References: Organization: Intel Corp. Message-ID: Date: Wed, 6 May 2020 21:22:55 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: 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 | 40 ++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 3fb5028aef08..19ed53e08294 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -164,6 +164,46 @@ with it. --append may be used here. Examples: 3>results perf stat --log-fd 3 -- $cmd 3>>results perf stat --log-fd 3 --append -- $cmd +--ctl-fd:: +--ctl-fd-ack:: + +Listen on ctl-fd descriptor for command to control measurement ('e': enable events, +'d': disable events). Optionally send control command completion ('a') to fd-ack +descriptor to synchronize with the controlling process. Example of bash shell script +to enable and disable events during measurements: + +#!/bin/bash + +ctl_dir=/tmp/ + +ctl_fifo=${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 'e' >&${ctl_fd} && read -u ${ctl_fd_ack} e1 && echo "enabled(${e1})" +sleep 10 && echo 'd' >&${ctl_fd} && read -u ${ctl_fd_ack} d1 && echo "disabled(${d1})" + +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