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....@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
