[PATCH v4 2/6] perf scripts python: Extact necessary information from process event

[Anup Sharma]

The script takes in a sample event dictionary(param_dict) and retrieves
relevant data such as time stamp, PID, TID, and comm for each event.
Also start time is defined as a global variable as it need to be passed
to trace_end for gecko meta information field creation.

Signed-off-by: Anup Sharma <anupnewsmail@xxxxxxxxx>
---
 .../perf/scripts/python/firefox-gecko-converter.py | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/tools/perf/scripts/python/firefox-gecko-converter.py b/tools/perf/scripts/python/firefox-gecko-converter.py
index 63ecaf1abee8..bfc8c2b026bf 100644
--- a/tools/perf/scripts/python/firefox-gecko-converter.py
+++ b/tools/perf/scripts/python/firefox-gecko-converter.py
@@ -20,10 +20,22 @@ sys.path.append(os.environ['PERF_EXEC_PATH'] + \
 from perf_trace_context import *
 from Core import *
 
+# start_time is intialiazed only once for the all event traces.
+start_time = None
+
 # Uses perf script python interface to parse each
 # event and store the data in the thread builder.
 def process_event(param_dict: Dict) -> None:
-	pass
+	global start_time
+	global tid_to_thread
+	time_stamp = (param_dict['sample']['time'] // 1000) / 1000
+	pid = param_dict['sample']['pid']
+	tid = param_dict['sample']['tid']
+	comm = param_dict['comm']
+
+	# Start time is the time of the first sample
+	if not start_time:
+		start_time = time_stamp
 
 # Trace_end runs at the end and will be used to aggregate
 # the data into the final json object and print it out to stdout.
-- 
2.34.1