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=-9.7 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_GIT 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 EB149C38A24 for ; Thu, 7 May 2020 07:00:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D2F852075E for ; Thu, 7 May 2020 07:00:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726575AbgEGHAa (ORCPT ); Thu, 7 May 2020 03:00:30 -0400 Received: from mga04.intel.com ([192.55.52.120]:18356 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726320AbgEGHA1 (ORCPT ); Thu, 7 May 2020 03:00:27 -0400 IronPort-SDR: kNyEyZe8xEq8uKMckz9BxS38bk9hAjUGI6ffpHElqF6ENDidnd0CLUsBrVoJG01foO2Wf0fsln ofd/bCss6Xwg== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2020 00:00:27 -0700 IronPort-SDR: Q//iwPQJInuUFkbbb4hY0VVLOavA/Jv1JtZINKfvc6FMgJjATo9Cn4OmBtfLYnIPDRXtkOAc+h Ta81sKCOgMVA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,362,1583222400"; d="scan'208";a="370026087" Received: from kbl-ppc.sh.intel.com ([10.239.159.118]) by fmsmga001.fm.intel.com with ESMTP; 07 May 2020 00:00:23 -0700 From: Jin Yao To: acme@kernel.org, jolsa@kernel.org, peterz@infradead.org, mingo@redhat.com, alexander.shishkin@linux.intel.com Cc: Linux-kernel@vger.kernel.org, ak@linux.intel.com, kan.liang@intel.com, yao.jin@intel.com, Jin Yao Subject: [PATCH v3 1/4] perf stat: Fix wrong per-thread runtime stat for interval mode Date: Thu, 7 May 2020 14:58:19 +0800 Message-Id: <20200507065822.8255-2-yao.jin@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200507065822.8255-1-yao.jin@linux.intel.com> References: <20200507065822.8255-1-yao.jin@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org root@kbl-ppc:~# perf stat --per-thread -e cycles,instructions -I1000 --interval-count 2 1.004171683 perf-3696 8,747,311 cycles ... 1.004171683 perf-3696 691,730 instructions # 0.08 insn per cycle ... 2.006490373 perf-3696 1,749,936 cycles ... 2.006490373 perf-3696 1,484,582 instructions # 0.28 insn per cycle ... Let's see interval 2.006490373 perf-3696 1,749,936 cycles perf-3696 1,484,582 instructions # 0.28 insn per cycle insn per cycle = 1,484,582 / 1,749,936 = 0.85. But now it's 0.28, that's not correct. stat_config.stats[] records the per-thread runtime stat. But for interval mode, it should be reset for each interval. So now, with this patch, root@kbl-ppc:~# perf stat --per-thread -e cycles,instructions -I1000 --interval-count 2 1.005818121 perf-8633 9,898,045 cycles ... 1.005818121 perf-8633 693,298 instructions # 0.07 insn per cycle ... 2.007863743 perf-8633 1,551,619 cycles ... 2.007863743 perf-8633 1,317,514 instructions # 0.85 insn per cycle ... Let's check interval 2.007863743. insn per cycle = 1,317,514 / 1,551,619 = 0.85. It's correct. Fixes: commit 14e72a21c783 ("perf stat: Update or print per-thread stats") Signed-off-by: Jin Yao --- tools/perf/builtin-stat.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index e0c1ad23c768..97ee941649e6 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -351,6 +351,16 @@ static void read_counters(struct timespec *rs) } } +static void thread_stats_reset(struct perf_stat_config *config) +{ + int i; + + if (config->stats) { + for (i = 0; i < config->stats_num; i++) + perf_stat__reset_shadow_per_stat(&config->stats[i]); + } +} + static void process_interval(void) { struct timespec ts, rs; @@ -359,6 +369,7 @@ static void process_interval(void) diff_timespec(&rs, &ts, &ref_time); perf_stat__reset_shadow_per_stat(&rt_stat); + thread_stats_reset(&stat_config); read_counters(&rs); if (STAT_RECORD) { -- 2.17.1