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=-8.3 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 C1BD7C433E0 for ; Mon, 1 Jun 2020 20:18:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A3C5B20734 for ; Mon, 1 Jun 2020 20:18:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728443AbgFAUSG (ORCPT ); Mon, 1 Jun 2020 16:18:06 -0400 Received: from mga03.intel.com ([134.134.136.65]:29683 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727996AbgFAUSF (ORCPT ); Mon, 1 Jun 2020 16:18:05 -0400 IronPort-SDR: za8B4K5qo962Sl5ac4BOz3Bvub98FGjX6XNyVlOuunpsfumFJiJd95q56uSPhhhkrh5GqC7UHN K4epFpCoGtKw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jun 2020 13:18:04 -0700 IronPort-SDR: R2AYj3SccqpOo7YigFgjni9lNXpfOVn5BTssjIdk1GKqYL3M3MRml7uEAwa8uEfH2rozK6j3Ou oJdx217LgHBA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,462,1583222400"; d="scan'208";a="303752754" Received: from linux.intel.com ([10.54.29.200]) by fmsmga002.fm.intel.com with ESMTP; 01 Jun 2020 13:18:04 -0700 Received: from [10.249.230.65] (abudanko-mobl.ccr.corp.intel.com [10.249.230.65]) by linux.intel.com (Postfix) with ESMTP id B87DA58002E; Mon, 1 Jun 2020 13:18:01 -0700 (PDT) Subject: [PATCH v6 10/13] perf stat: introduce --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: Organization: Intel Corp. Message-ID: <2fba84d0-3448-a318-43d7-e2fbb8ccde11@linux.intel.com> Date: Mon, 1 Jun 2020 23:17:59 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.8.1 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 Introduce --ctl-fd[-ack] options to pass open file descriptors numbers from command line. 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 ++++++++++++++++++++++++++ tools/perf/builtin-stat.c | 11 +++++++ tools/perf/util/stat.h | 2 ++ 3 files changed, 53 insertions(+) diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 9f32f6cd558d..c4a5d31062ef 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -176,6 +176,46 @@ with it. --append may be used here. Examples: 3>results perf stat --log-fd 3 -- $cmd 3>>results perf stat --log-fd 3 --append -- $cmd +--ctl-fd:: +--ctl-fd-ack:: + +Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, +'disable': disable events). Optionally send control command completion ('ack') to fd-ack +descriptor to synchronize with the controlling process. Example of bash shell script +to enable and disable events during measurements: + +#!/bin/bash + +ctl_dir=/tmp/ + +ctl_fifo=${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 'enable' >&${ctl_fd} && read -u ${ctl_fd_ack} e1 && echo "enabled(${e1})" +sleep 10 && echo 'disable' >&${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.: diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 4a197b5eee23..a878e106ead0 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -188,6 +188,8 @@ static struct perf_stat_config stat_config = { .metric_only_len = METRIC_ONLY_LEN, .walltime_nsecs_stats = &walltime_nsecs_stats, .big_num = true, + .ctl_fd = -1, + .ctl_fd_ack = -1 }; static inline void diff_timespec(struct timespec *r, struct timespec *a, @@ -1080,6 +1082,10 @@ static struct option stat_options[] = { "libpfm4 event selector. use 'perf list' to list available events", parse_libpfm_events_option), #endif + OPT_INTEGER(0, "ctl-fd", &stat_config.ctl_fd, + "Listen on fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events)"), + OPT_INTEGER(0, "ctl-fd-ack", &stat_config.ctl_fd_ack, + "Send control command completion ('ack') to fd ack descriptor"), OPT_END() }; @@ -2249,6 +2255,9 @@ int cmd_stat(int argc, const char **argv) signal(SIGALRM, skip_signal); signal(SIGABRT, skip_signal); + if (evlist__initialize_ctlfd(evsel_list, stat_config.ctl_fd, stat_config.ctl_fd_ack)) + goto out; + status = 0; for (run_idx = 0; forever || run_idx < stat_config.run_count; run_idx++) { if (stat_config.run_count != 1 && verbose > 0) @@ -2268,6 +2277,8 @@ int cmd_stat(int argc, const char **argv) if (!forever && status != -1 && (!interval || stat_config.summary)) print_counters(NULL, argc, argv); + evlist__finalize_ctlfd(evsel_list); + if (STAT_RECORD) { /* * We synthesize the kernel mmap record just so that older tools diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h index 626421ef35c2..06f0baabe775 100644 --- a/tools/perf/util/stat.h +++ b/tools/perf/util/stat.h @@ -133,6 +133,8 @@ struct perf_stat_config { struct perf_cpu_map *cpus_aggr_map; u64 *walltime_run; struct rblist metric_events; + int ctl_fd; + int ctl_fd_ack; }; void perf_stat__set_big_num(int set); -- 2.24.1