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 74D0AC433E0 for ; Wed, 20 May 2020 15:17:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4CF0E206B6 for ; Wed, 20 May 2020 15:17:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726939AbgETPRp (ORCPT ); Wed, 20 May 2020 11:17:45 -0400 Received: from mga17.intel.com ([192.55.52.151]:41364 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726525AbgETPRp (ORCPT ); Wed, 20 May 2020 11:17:45 -0400 IronPort-SDR: 6mrkQpoxVvimnXFk1s2DVpCLPtNFPhXwJbiBJZhzF+WmfG+2wYGxvuesVTv0ZHaSSDaErmeESw 7XBKB1J5kLCg== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 May 2020 08:17:44 -0700 IronPort-SDR: o5mrQIc6sWGci/owP7lsuPFElS3GOpGWGrOtayhLHZCTQjPy8M+Aq96jmylXP51pIrTkZ2aLyX skU1bVS2ZooA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,414,1583222400"; d="scan'208";a="440066793" Received: from linux.intel.com ([10.54.29.200]) by orsmga005.jf.intel.com with ESMTP; 20 May 2020 08:17:43 -0700 Received: from [10.249.231.6] (abudanko-mobl.ccr.corp.intel.com [10.249.231.6]) by linux.intel.com (Postfix) with ESMTP id D051A580613; Wed, 20 May 2020 08:17:41 -0700 (PDT) Subject: Re: [PATCH v3 3/9] perf stat: factor out event handling loop into a function To: Jiri Olsa Cc: Arnaldo Carvalho de Melo , Namhyung Kim , Alexander Shishkin , Peter Zijlstra , Ingo Molnar , Andi Kleen , linux-kernel References: <20200520123850.GI157452@krava> From: Alexey Budankov Organization: Intel Corp. Message-ID: Date: Wed, 20 May 2020 18:17:40 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200520123850.GI157452@krava> 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 On 20.05.2020 15:38, Jiri Olsa wrote: > On Wed, May 13, 2020 at 11:00:47AM +0300, Alexey Budankov wrote: >> >> Factor out event handling loop into handle_events() function. >> >> Signed-off-by: Alexey Budankov >> --- >> tools/perf/builtin-stat.c | 85 +++++++++++++++++++++++---------------- >> 1 file changed, 50 insertions(+), 35 deletions(-) >> >> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c >> index e0c1ad23c768..9775b0905146 100644 >> --- a/tools/perf/builtin-stat.c >> +++ b/tools/perf/builtin-stat.c >> @@ -371,6 +371,16 @@ static void process_interval(void) >> print_counters(&rs, 0, NULL); >> } >> >> +static bool print_interval_and_stop(struct perf_stat_config *config, int *times) >> +{ >> + if (config->interval) { >> + process_interval(); >> + if (interval_count && !(--(*times))) >> + return true; >> + } >> + return false; >> +} >> + >> static void enable_counters(void) >> { >> if (stat_config.initial_delay) >> @@ -436,6 +446,42 @@ static bool is_target_alive(struct target *_target, >> return false; >> } >> >> +static int handle_events(pid_t pid, struct perf_stat_config *config) >> +{ >> + pid_t child = 0; >> + bool res, stop = false; >> + struct timespec time_to_sleep; >> + int sleep_time, status = 0, times = config->times; >> + >> + if (config->interval) >> + sleep_time = config->interval; >> + else if (config->timeout) >> + sleep_time = config->timeout; >> + else >> + sleep_time = 1000; >> + >> + time_to_sleep.tv_sec = sleep_time / MSEC_PER_SEC; >> + time_to_sleep.tv_nsec = (sleep_time % MSEC_PER_SEC) * NSEC_PER_MSEC; >> + >> + do { >> + if (pid != -1) >> + child = waitpid(pid, &status, WNOHANG); >> + if (child || stop || done) >> + break; >> + nanosleep(&time_to_sleep, NULL); >> + if (pid == -1) >> + stop = !is_target_alive(&target, evsel_list->core.threads); >> + if (config->timeout) { >> + stop = !stop ? true : stop; >> + } else { >> + res = print_interval_and_stop(config, ×); >> + stop = !stop ? res : stop; >> + } >> + } while (1); >> + >> + return status; >> +} >> + >> enum counter_recovery { >> COUNTER_SKIP, >> COUNTER_RETRY, >> @@ -494,12 +540,10 @@ static enum counter_recovery stat_handle_error(struct evsel *counter) >> static int __run_perf_stat(int argc, const char **argv, int run_idx) >> { >> int interval = stat_config.interval; >> - int times = stat_config.times; >> int timeout = stat_config.timeout; >> 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); >> @@ -508,17 +552,6 @@ 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) { >> @@ -675,16 +708,9 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx) >> perf_evlist__start_workload(evsel_list); >> enable_counters(); >> >> - if (interval || timeout) { >> - while (!waitpid(child_pid, &status, WNOHANG)) { >> - nanosleep(&ts, NULL); >> - if (timeout) >> - break; >> - process_interval(); >> - if (interval_count && !(--times)) >> - break; >> - } >> - } >> + if (interval || timeout) >> + handle_events(child_pid, &stat_config); >> + >> if (child_pid != -1) { >> if (timeout) >> kill(child_pid, SIGTERM); >> @@ -701,18 +727,7 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx) >> psignal(WTERMSIG(status), argv[0]); >> } else { >> enable_counters(); >> - while (!done) { >> - nanosleep(&ts, NULL); >> - if (!is_target_alive(&target, evsel_list->core.threads)) >> - break; >> - if (timeout) >> - break; >> - if (interval) { >> - process_interval(); >> - if (interval_count && !(--times)) >> - break; >> - } >> - } >> + handle_events(-1, &stat_config); > > this makes me worried.. I'm not sure if it's good idea > to squash these 2 looops into one, because they are already > complex as they are.. and one of you following patches is > making it even more complex Loops bodies are mostly identical. The only difference is in events they wait for and API used for that. Adding of more events will complicate further. The code is duplicated, thus needs refactoring. If the following patch complicates lets organize the patch it into several smaller functions. > > wouldn't it be better if you just add single call into > each of them.. that would poll on your fd and process the > commands if needed? That's of course possible, but doesn't manage existing complexity at the first place - __run_perf_stat(). Let's still have handle_events() as a general dispatcher and implement handlers for different events as separate functions? ~Alexey