cee25aa926
Bug: 229983560
Test: system/core/init/compare-bootcharts.py \
base-bootchart-dir exp-bootchart-dir
Change-Id: I72a3720cb3a80ef8d4fcb06fba8c8893ac08c930
146 lines
5.4 KiB
Python
Executable file
146 lines
5.4 KiB
Python
Executable file
#!/usr/bin/env python
|
|
|
|
# Copyright (C) 2015 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.
|
|
|
|
"""Compare two bootcharts and list start/end timestamps on key processes.
|
|
|
|
This script extracts two bootchart.tgz files and compares the timestamps
|
|
in proc_ps.log for selected processes. The proc_ps.log file consists of
|
|
repetitive blocks of the following format:
|
|
|
|
timestamp1 (jiffies)
|
|
dumps of /proc/<pid>/stat
|
|
|
|
timestamp2
|
|
dumps of /proc/<pid>/stat
|
|
|
|
The timestamps are 200ms apart, and the creation time of selected processes
|
|
are listed. The termination time of the boot animation process is also listed
|
|
as a coarse indication about when the boot process is complete as perceived by
|
|
the user.
|
|
"""
|
|
|
|
import sys
|
|
import tarfile
|
|
|
|
# The bootchart timestamps are 200ms apart, but the USER_HZ value is not
|
|
# reported in the bootchart, so we use the first two timestamps to calculate
|
|
# the wall clock time of a jiffy.
|
|
jiffy_to_wallclock = {
|
|
'1st_timestamp': -1,
|
|
'2nd_timestamp': -1,
|
|
'jiffy_to_wallclock': -1
|
|
}
|
|
|
|
def analyze_process_maps(process_map1, process_map2, jiffy_record):
|
|
# List interesting processes here
|
|
processes_of_interest = [
|
|
'/init',
|
|
'/system/bin/surfaceflinger',
|
|
'/system/bin/bootanimation',
|
|
'zygote64',
|
|
'zygote',
|
|
'system_server'
|
|
]
|
|
|
|
jw = jiffy_record['jiffy_to_wallclock']
|
|
print("process: baseline experiment (delta)")
|
|
print(" - Unit is ms (a jiffy is %d ms on the system)" % jw)
|
|
print("------------------------------------")
|
|
for p in processes_of_interest:
|
|
# e.g., 32-bit system doesn't have zygote64
|
|
if p in process_map1 and p in process_map2:
|
|
print("%s: %d %d (%+d)" % (
|
|
p, process_map1[p]['start_time'] * jw,
|
|
process_map2[p]['start_time'] * jw,
|
|
(process_map2[p]['start_time'] -
|
|
process_map1[p]['start_time']) * jw))
|
|
|
|
# Print the last tick for the bootanimation process
|
|
print("bootanimation ends at: %d %d (%+d)" % (
|
|
process_map1['/system/bin/bootanimation']['last_tick'] * jw,
|
|
process_map2['/system/bin/bootanimation']['last_tick'] * jw,
|
|
(process_map2['/system/bin/bootanimation']['last_tick'] -
|
|
process_map1['/system/bin/bootanimation']['last_tick']) * jw))
|
|
|
|
def parse_proc_file(pathname, process_map, jiffy_record=None):
|
|
# Uncompress bootchart.tgz
|
|
with tarfile.open(pathname + '/bootchart.tgz', 'r:*') as tf:
|
|
try:
|
|
# Read proc_ps.log
|
|
f = tf.extractfile('proc_ps.log')
|
|
|
|
# Break proc_ps into chunks based on timestamps
|
|
blocks = f.read().decode('utf-8').split('\n\n')
|
|
for b in blocks:
|
|
lines = b.split('\n')
|
|
if not lines[0]:
|
|
break
|
|
|
|
# 200ms apart in jiffies
|
|
timestamp = int(lines[0]);
|
|
|
|
# Figure out the wall clock time of a jiffy
|
|
if jiffy_record is not None:
|
|
if jiffy_record['1st_timestamp'] == -1:
|
|
jiffy_record['1st_timestamp'] = timestamp
|
|
elif jiffy_record['jiffy_to_wallclock'] == -1:
|
|
# Not really needed but for debugging purposes
|
|
jiffy_record['2nd_timestamp'] = timestamp
|
|
value = 200 / (timestamp -
|
|
jiffy_record['1st_timestamp'])
|
|
# Fix the rounding error
|
|
# e.g., 201 jiffies in 200ms when USER_HZ is 1000
|
|
if value == 0:
|
|
value = 1
|
|
# e.g., 21 jiffies in 200ms when USER_HZ is 100
|
|
elif value == 9:
|
|
value = 10
|
|
jiffy_record['jiffy_to_wallclock'] = value
|
|
|
|
# Populate the process_map table
|
|
for line in lines[1:]:
|
|
segs = line.split(' ')
|
|
|
|
# 0: pid
|
|
# 1: process name
|
|
# 17: priority
|
|
# 18: nice
|
|
# 21: creation time
|
|
|
|
proc_name = segs[1].strip('()')
|
|
if proc_name in process_map:
|
|
process = process_map[proc_name]
|
|
else:
|
|
process = {'start_time': int(segs[21])}
|
|
process_map[proc_name] = process
|
|
|
|
process['last_tick'] = timestamp
|
|
finally:
|
|
f.close()
|
|
|
|
def main():
|
|
if len(sys.argv) != 3:
|
|
print("Usage: %s base_bootchart_dir exp_bootchart_dir" % sys.argv[0])
|
|
sys.exit(1)
|
|
|
|
process_map1 = {}
|
|
process_map2 = {}
|
|
parse_proc_file(sys.argv[1], process_map1, jiffy_to_wallclock)
|
|
parse_proc_file(sys.argv[2], process_map2)
|
|
analyze_process_maps(process_map1, process_map2, jiffy_to_wallclock)
|
|
|
|
if __name__ == "__main__":
|
|
main()
|