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