Messages in this thread Patch in this message | | | From | Jin Yao <> | Subject | [PATCH v3 2/6] perf record: Get the first sample time and last sample time | Date | Thu, 28 Sep 2017 20:45:17 +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.
Change log: ----------- v3: Remove the definitions of first_sample_time and last_sample_time from struct record and directly save them in perf_evlist.
Signed-off-by: Jin Yao <yao.jin@linux.intel.com> --- tools/perf/builtin-record.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 9b379f3..d5b78449 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -488,6 +488,11 @@ static int process_sample_event(struct perf_tool *tool, rec->samples++; + if (rec->evlist->first_sample_time == 0) + rec->evlist->first_sample_time = sample->time; + + rec->evlist->last_sample_time = sample->time; + return build_id__mark_dso_hit(tool, event, sample, evsel, machine); } -- 2.7.4
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