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 7752CC433E0 for ; Mon, 1 Jun 2020 20:17:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5685B20734 for ; Mon, 1 Jun 2020 20:17:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728392AbgFAURY (ORCPT ); Mon, 1 Jun 2020 16:17:24 -0400 Received: from mga11.intel.com ([192.55.52.93]:6175 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727996AbgFAURY (ORCPT ); Mon, 1 Jun 2020 16:17:24 -0400 IronPort-SDR: ez1OClIHwYkiHQw0WzDudjZqOLofEWpQzJ/quJ6sGuF0wTZuMtARIe7mSDWS4jpW9iGJq4GaSa 9/Xlv1oZcwbw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jun 2020 13:17:23 -0700 IronPort-SDR: 2cUmnAzLqpUO1u9kmNGx+LMfvVjxJqV4LjKvzwf9Atfou4y6VSBKd2RdlcGNKlDaU3pVnhr6HT m1xlvCDDHSMQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,462,1583222400"; d="scan'208";a="470442448" Received: from linux.intel.com ([10.54.29.200]) by fmsmga005.fm.intel.com with ESMTP; 01 Jun 2020 13:17:22 -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 CD25358002E; Mon, 1 Jun 2020 13:17:19 -0700 (PDT) Subject: [PATCH v6 09/13] perf stat: implement control commands handling 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: <3c85901f-c03c-e595-a09e-f95fa06f9e7a@linux.intel.com> Date: Mon, 1 Jun 2020 23:17:18 +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 Implement handling of 'enable' and 'disable' control commands coming from control file descriptor. process_evlist() function checks for events on static fd and makes required operations. If poll event splits initiated timeout interval then the reminder is calculated and still waited in the following poll() syscall. Signed-off-by: Alexey Budankov --- tools/perf/builtin-stat.c | 67 +++++++++++++++++++++++++++++---------- 1 file changed, 50 insertions(+), 17 deletions(-) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 8cf248bb9e78..4a197b5eee23 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -439,6 +439,31 @@ static bool process_timeout(int timeout, unsigned int interval, int *times) return print_interval(interval, times); } +static bool process_evlist(struct evlist *evlist, unsigned int interval, int *times) +{ + bool stop = false; + enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED; + + if (evlist__ctlfd_process(evlist, &cmd) > 0) { + switch (cmd) { + case EVLIST_CTL_CMD_ENABLE: + pr_info(EVLIST_ENABLED_MSG); + stop = print_interval(interval, times); + break; + case EVLIST_CTL_CMD_DISABLE: + stop = print_interval(interval, times); + pr_info(EVLIST_DISABLED_MSG); + break; + case EVLIST_CTL_CMD_ACK: + case EVLIST_CTL_CMD_UNSUPPORTED: + default: + break; + } + } + + return stop; +} + static void enable_counters(void) { if (stat_config.initial_delay < 0) { @@ -514,10 +539,21 @@ static bool is_target_alive(struct target *_target, return false; } -static int dispatch_events(bool forks, int timeout, int interval, int *times, struct timespec *ts) +static int dispatch_events(bool forks, int timeout, int interval, int *times) { bool stop = false; int child = 0, status = 0; + int time_to_sleep, sleep_time; + struct timespec time_start, time_stop, time_diff; + + if (interval) + sleep_time = interval; + else if (timeout) + sleep_time = timeout; + else + sleep_time = 1000; + + time_to_sleep = sleep_time; while (1) { if (forks) @@ -528,8 +564,17 @@ static int dispatch_events(bool forks, int timeout, int interval, int *times, st if (done || stop || child) break; - nanosleep(ts, NULL); - stop = process_timeout(timeout, interval, times); + clock_gettime(CLOCK_MONOTONIC, &time_start); + if (!(evlist__poll(evsel_list, time_to_sleep) > 0)) { /* poll timeout or EINTR */ + stop = process_timeout(timeout, interval, times); + time_to_sleep = sleep_time; + } else { /* fd revent */ + stop = process_evlist(evsel_list, interval, times); + clock_gettime(CLOCK_MONOTONIC, &time_stop); + diff_timespec(&time_diff, &time_stop, &time_start); + time_to_sleep -= time_diff.tv_sec * MSEC_PER_SEC + + time_diff.tv_nsec / NSEC_PER_MSEC; + } } return status; @@ -598,7 +643,6 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx) char msg[BUFSIZ]; unsigned long long t0, t1; struct evsel *counter; - struct timespec ts; size_t l; int status = 0; const bool forks = (argc > 0); @@ -607,17 +651,6 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx) int i, cpu; bool second_pass = false; - if (interval) { - ts.tv_sec = interval / USEC_PER_MSEC; - ts.tv_nsec = (interval % USEC_PER_MSEC) * NSEC_PER_MSEC; - } else if (timeout) { - ts.tv_sec = timeout / USEC_PER_MSEC; - ts.tv_nsec = (timeout % USEC_PER_MSEC) * NSEC_PER_MSEC; - } else { - ts.tv_sec = 1; - ts.tv_nsec = 0; - } - if (forks) { if (perf_evlist__prepare_workload(evsel_list, &target, argv, is_pipe, workload_exec_failed_signal) < 0) { @@ -775,7 +808,7 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx) enable_counters(); if (interval || timeout) - status = dispatch_events(forks, timeout, interval, ×, &ts); + status = dispatch_events(forks, timeout, interval, ×); if (child_pid != -1) { if (timeout) kill(child_pid, SIGTERM); @@ -792,7 +825,7 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx) psignal(WTERMSIG(status), argv[0]); } else { enable_counters(); - dispatch_events(forks, timeout, interval, ×, &ts); + dispatch_events(forks, timeout, interval, ×); } disable_counters(); -- 2.24.1