1 files changed, 64 insertions, 1 deletions
diff --git a/tools/perf/scripts/python/gecko.py b/tools/perf/scripts/python/gecko.py
index 2cd5cd6e31e3..794a91bec464 100644
--- a/tools/perf/scripts/python/gecko.py
+++ b/tools/perf/scripts/python/gecko.py
@@ -11,6 +11,8 @@
 
 import os
 import sys
+import json
+import argparse
 from dataclasses import dataclass, field
 from typing import List, Dict, Optional, NamedTuple, Set, Tuple, Any
 
@@ -30,6 +32,13 @@ Milliseconds = float
 # start_time is intialiazed only once for the all event traces.
 start_time = None
 
+# https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/profile.js#L425
+# Follow Brendan Gregg's Flamegraph convention: orange for kernel and yellow for user space by default.
+CATEGORIES = None
+
+# The product name is used by the profiler UI to show the Operating system and Processor.
+PRODUCT = os.popen('uname -op').read().strip()
+
 # https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L156
 class Frame(NamedTuple):
 	string_id: StringID
@@ -171,4 +180,58 @@ def process_event(param_dict: Dict) -> None:
 # 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.
 def trace_end() -> None:
-	pass
+	# Schema: https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L305
+	gecko_profile_with_meta = {
+		"meta": {
+			"interval": 1,
+			"processType": 0,
+			"product": PRODUCT,
+			"stackwalk": 1,
+			"debug": 0,
+			"gcpoison": 0,
+			"asyncstack": 1,
+			"startTime": start_time,
+			"shutdownTime": None,
+			"version": 24,
+			"presymbolicated": True,
+			"categories": CATEGORIES,
+			"markerSchema": [],
+			},
+		"libs": [],
+		# threads will be implemented in later commits.
+		# "threads": threads,
+		"processes": [],
+		"pausedRanges": [],
+	}
+	json.dump(gecko_profile_with_meta, sys.stdout, indent=2)
+
+def main() -> None:
+	global CATEGORIES
+	parser = argparse.ArgumentParser(description="Convert perf.data to Firefox\'s Gecko Profile format")
+
+	# Add the command-line options
+	# Colors must be defined according to this:
+	# https://github.com/firefox-devtools/profiler/blob/50124adbfa488adba6e2674a8f2618cf34b59cd2/res/css/categories.css
+	parser.add_argument('--user-color', default='yellow', help='Color for the User category')
+	parser.add_argument('--kernel-color', default='orange', help='Color for the Kernel category')
+	# Parse the command-line arguments
+	args = parser.parse_args()
+	# Access the values provided by the user
+	user_color = args.user_color
+	kernel_color = args.kernel_color
+
+	CATEGORIES = [
+		{
+			"name": 'User',
+			"color": user_color,
+			"subcategories": ['Other']
+		},
+		{
+			"name": 'Kernel',
+			"color": kernel_color,
+			"subcategories": ['Other']
+		},
+	]
+
+if __name__ == '__main__':
+    main()