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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 ED4BBC433E0 for ; Tue, 16 Mar 2021 21:19:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 94C8D64FA7 for ; Tue, 16 Mar 2021 21:19:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233038AbhCPVTK (ORCPT ); Tue, 16 Mar 2021 17:19:10 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:38126 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S233393AbhCPVSw (ORCPT ); Tue, 16 Mar 2021 17:18:52 -0400 Received: from pps.filterd (m0001303.ppops.net [127.0.0.1]) by m0001303.ppops.net (8.16.0.43/8.16.0.43) with SMTP id 12GLCrml008836 for ; Tue, 16 Mar 2021 14:18:52 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=njSFK3JicRjyo/4KbE9DTbc90wVESEM3DHSU7jx5peA=; b=BH7ONY1CVZSK/snBRNq5m0u6wn3dng+h0Nl33byzInRt0P/J6ABitsYDiB4L6rAf3Ykl 2PgyRfqx8U1lO2oWfLGV6KRuGTdm+Ipk/dI07iyZKquXaWkkiyfGk9Nbk3TMfVx+PgQL V2muOJhct8fFrMj9MyV6NnGIykiMB7zOdGg= Received: from maileast.thefacebook.com ([163.114.130.16]) by m0001303.ppops.net with ESMTP id 37armw449y-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 16 Mar 2021 14:18:52 -0700 Received: from intmgw001.05.ash7.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::e) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Tue, 16 Mar 2021 14:18:51 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 93D7062E181B; Tue, 16 Mar 2021 14:18:49 -0700 (PDT) From: Song Liu To: CC: , , , , , Song Liu Subject: [PATCH v2 2/3] perf-stat: measure t0 and ref_time after enable_counters() Date: Tue, 16 Mar 2021 14:18:36 -0700 Message-ID: <20210316211837.910506-3-songliubraving@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210316211837.910506-1-songliubraving@fb.com> References: <20210316211837.910506-1-songliubraving@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-03-16_08:2021-03-16,2021-03-16 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 adultscore=0 spamscore=0 bulkscore=0 malwarescore=0 suspectscore=0 clxscore=1015 mlxlogscore=999 phishscore=0 lowpriorityscore=0 mlxscore=0 impostorscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103160136 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Take measurements of t0 and ref_time after enable_counters(), so that they only measure the time consumed when the counters are enabled. Signed-off-by: Song Liu --- tools/perf/builtin-stat.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 92696373da994..d030c3a49a8e4 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -931,15 +931,15 @@ static int __run_perf_stat(int argc, const char **a= rgv, int run_idx) /* * Enable counters and exec the command: */ - t0 =3D rdclock(); - clock_gettime(CLOCK_MONOTONIC, &ref_time); - if (forks) { evlist__start_workload(evsel_list); err =3D enable_counters(); if (err) return -1; =20 + t0 =3D rdclock(); + clock_gettime(CLOCK_MONOTONIC, &ref_time); + if (interval || timeout || evlist__ctlfd_initialized(evsel_list)) status =3D dispatch_events(forks, timeout, interval, ×); if (child_pid !=3D -1) { @@ -960,6 +960,10 @@ static int __run_perf_stat(int argc, const char **ar= gv, int run_idx) err =3D enable_counters(); if (err) return -1; + + t0 =3D rdclock(); + clock_gettime(CLOCK_MONOTONIC, &ref_time); + status =3D dispatch_events(forks, timeout, interval, ×); } =20 --=20 2.30.2