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#!/usr/bin/env python3
#
# Copyright (C) 2023 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import sys
import os
import json
import argparse
def update_timestamp_perfetto_trace(trace_dict, time_offset):
if time_offset == 0:
return
for event in trace_dict['traceEvents']:
if 'ts' in event:
event['ts'] += time_offset
def update_pid_perfetto_trace(trace_dict, start_pid, max_pid):
if start_pid >= max_pid:
raise SystemExit(f"Error: start_pid {start_pid} should be smaller than max_pid {max_pid}")
if start_pid < 0 or max_pid <= 0:
raise SystemExit(f"Error: both start_pid {start_pid} and max_pid {max_pid} should be larger than 0")
pid_dict = {}
current_max_pid = start_pid
for event in trace_dict['traceEvents']:
if 'pid' in event:
old_pid = event['pid']
new_pid = pid_dict.get(old_pid)
if new_pid == None:
if current_max_pid < max_pid:
new_pid = current_max_pid
pid_dict[old_pid] = new_pid
current_max_pid += 1
else:
raise SystemExit("Error: due to out of range for allocating pids")
event['pid'] = new_pid
def parseArguments():
parser = argparse.ArgumentParser(
description='Update perfetto trace event timestamp with the given offset.')
parser.add_argument('--input_file', required=True,
help='path to the input Perfetto JSON file')
parser.add_argument('--time_offset', type=int, required=False, default=0,
help='time offset value in nanoseconds. If it is 0, timestamp will not be updated.')
# At default set the start_pid = (2^16)
parser.add_argument('--start_pid', type=int, required=False, default=65536,
help='the smallest pid value')
# At default set the max_pid = (2^32)
parser.add_argument('--max_pid', type=int, required=False, default=4294967296,
help='the largest pid value. If max_pid == start_[id, pid will not be updated.')
args = parser.parse_args()
return args
if __name__ == '__main__':
args = parseArguments();
with open(args.input_file, 'r') as f:
trace_dict = json.loads(f.read())
update_timestamp_perfetto_trace(trace_dict, args.time_offset)
update_pid_perfetto_trace(trace_dict, args.start_pid, args.max_pid)
# Save the updated trace data to a new JSON file
# add '_updated' to the output filename
file_path = os.path.splitext(args.input_file)
output_file = f"{file_path[0]}_updated.json"
with open(output_file, 'w') as f:
json.dump(trace_dict, f)
print(f"Updated trace data saved to {output_file}")
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