Messages in this thread Patch in this message | | | From | 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 |
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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 <yao.jin@linux.intel.com> --- 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
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