From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967587AbdIZDDX (ORCPT ); Mon, 25 Sep 2017 23:03:23 -0400 Received: from mga14.intel.com ([192.55.52.115]:20894 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S967483AbdIZDCN (ORCPT ); Mon, 25 Sep 2017 23:02:13 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,438,1500966000"; d="scan'208";a="153305062" 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 v2 2/6] perf record: Get the first sample time and last sample time Date: Tue, 26 Sep 2017 18:57:58 +0800 Message-Id: <1506423482-16894-3-git-send-email-yao.jin@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1506423482-16894-1-git-send-email-yao.jin@linux.intel.com> References: <1506423482-16894-1-git-send-email-yao.jin@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In perf record, it's walked on all samples yet. So it's very easy to get the first/last samples and save the time to perf file header via the function write_sample_time(). In later, perf report/script will fetch the time from perf file header. Signed-off-by: Jin Yao --- tools/perf/builtin-record.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 9b379f3..3428633 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -80,6 +80,8 @@ struct record { bool timestamp_filename; struct switch_output switch_output; unsigned long long samples; + u64 first_sample_time; + u64 last_sample_time; }; static volatile int auxtrace_record__snapshot_started; @@ -488,6 +490,11 @@ static int process_sample_event(struct perf_tool *tool, rec->samples++; + if (rec->first_sample_time == 0) + rec->first_sample_time = sample->time; + + rec->last_sample_time = sample->time; + return build_id__mark_dso_hit(tool, event, sample, evsel, machine); } @@ -637,6 +644,14 @@ static void record__init_features(struct record *rec) perf_header__clear_feat(&session->header, HEADER_STAT); } +static void update_sample_time(struct record *rec) +{ + struct perf_evlist *evlist = rec->evlist; + + evlist->first_sample_time = rec->first_sample_time; + evlist->last_sample_time = rec->last_sample_time; +} + static void record__finish_output(struct record *rec) { @@ -655,6 +670,8 @@ record__finish_output(struct record *rec) if (rec->buildid_all) dsos__hit_all(rec->session); } + + update_sample_time(rec); perf_session__write_header(rec->session, rec->evlist, fd, true); return; -- 2.7.4