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    Subject[PATCH v3 2/6] perf record: Get the first sample time and last sample time
    Date
    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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