linux-kernel - [PATCH v5 2/8] perf scripts python: Extact necessary information from process event

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Date:   Fri, 21 Jul 2023 23:22:56 +0530
From:   Anup Sharma <anupnewsmail@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Anup Sharma <anupnewsmail@...il.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 2/8] perf scripts python: Extact necessary information
 from process event

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@...il.com>
---
 tools/perf/scripts/python/perf-gecko.py | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/tools/perf/scripts/python/perf-gecko.py b/tools/perf/scripts/python/perf-gecko.py
index 4e651adb6395..02849d3c9e81 100644
--- a/tools/perf/scripts/python/perf-gecko.py
+++ b/tools/perf/scripts/python/perf-gecko.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