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#!/usr/bin/env python
#
# Copyright (C) 2016 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.
#
"""Analyze dm_verity trace"""
import collections
import math
import os
import re
import string
import sys
RE_VERITY = r'.+\s+([0-9]+\.[0-9]+):\s+block_verity_msg:\s+(\S+)\s+([0-9]+)\,([0-9]+)\s+([0-9]+)\s+([0-9]+)'
def get_average_and_std_dev(l):
sum_io = 0.0
sum_verity = 0.0
sum_total = 0.0
N = len(l)
sum_blocks = 0.0
for e in l:
sum_io += e.io_latency
sum_verity += e.verity_latency
sum_total += e.total_latency
sum_blocks += e.size
average_io = sum_io / N
average_verity = sum_verity / N
average_total = sum_total / N
var_io = 0.0
var_verity = 0.0
var_total = 0.0
for e in l:
var_io += (e.io_latency - average_io)**2
var_verity += (e.verity_latency - average_verity)**2
var_total += (e.total_latency - average_total)**2
sigma_io = math.sqrt(var_io / N)
sigma_verity = math.sqrt(var_verity / N)
sigma_total = math.sqrt(var_total / N)
return (average_io, sigma_io, sum_io), (average_verity, sigma_verity, sum_verity), \
(average_total, sigma_total, sum_total), sum_blocks
class Event:
def __init__(self, start_time, block_num, size):
self.block_num = block_num
self.start_time = start_time
self.io_end_time = 0
self.finish_time = 0
self.size = size
self.total_latency = 0
self.io_latency = 0
self.verity_latency = 0
def set_io_end_time(self, io_end_time):
self.io_end_time = io_end_time
self.io_latency = io_end_time - self.start_time
def set_finish_time(self, finish_time):
self.finish_time = finish_time
self.verity_latency = finish_time - self.io_end_time
self.total_latency = finish_time - self.start_time
class VerityTrace:
def __init__(self):
self.reads = [] # all events in start time
self.block_size_vs_reads_histogram = {} # key: size, value: list of events
self.recents = {} # not finished, key: block_nr, value: event
self.re = re.compile(RE_VERITY)
def handle_line(self, line):
match = self.re.match(line)
if not match:
return
time = int(float(match.group(1))*1000000) #us
step = match.group(2)
block_nr = int(match.group(5))
size = int(match.group(6))
recent_key = block_nr * 1000 + size
if step == "map":
event = Event(time, block_nr, size)
self.recents[recent_key] = event
self.reads.append(event)
per_size_list = self.block_size_vs_reads_histogram.get(size)
if not per_size_list:
per_size_list = []
self.block_size_vs_reads_histogram[size] = per_size_list
per_size_list.append(event)
elif step == "end_io":
event = self.recents[recent_key]
event.set_io_end_time(time)
elif step == "finish_io":
event = self.recents[recent_key]
event.set_finish_time(time)
del self.recents[recent_key]
def dump_list(self, msg, l):
io, verity, total, blocks = get_average_and_std_dev(l)
print msg, "counts:", len(l), "io latency:", io[0], io[1], io[2], "verity latency:", \
verity[0], verity[1], verity[2], "total:", total[0], total[1], total[2]
return io, verity, total, blocks
def dump(self):
print "Numbers: average (us), stddev (us), total (us)"
io, verity, total, blocks = self.dump_list ("total,", self.reads)
io_latency_per_1024KB = io[2] / blocks * (1024 / 4)
verity_latency_per_1024KB = verity[2] / blocks * (1024 / 4)
total_latency_per_1024KB = io_latency_per_1024KB + verity_latency_per_1024KB
print "Average latency for 1024KB (us), IO:", io_latency_per_1024KB, \
"Verity:", verity_latency_per_1024KB, "Total:", total_latency_per_1024KB
sizes = sorted(self.block_size_vs_reads_histogram.keys())
print "Latency per read size"
for s in sizes:
self.dump_list ("size " + str(s), self.block_size_vs_reads_histogram[s])
def main(argv):
if (len(argv) < 2):
print "check_io_trace.py filename"
return
filename = argv[1]
trace = VerityTrace()
with open(filename) as f:
for l in f:
trace.handle_line(l)
trace.dump()
if __name__ == '__main__':
main(sys.argv)
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