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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130#!/usr/bin/env python3# SPDX-License-Identifier: GPL-2.0-only## show_deltas: Read list of printk messages instrumented with# time data, and format with time deltas.## Also, you can show the times relative to a fixed point.## Copyright 2003 Sony Corporation#
import sysimport string
def usage(): print ("""usage: show_delta [<options>] <filename>
This program parses the output from a set of printk message lines whichhave time data prefixed because the CONFIG_PRINTK_TIME option is set, orthe kernel command line option "time" is specified. When run with nooptions, the time information is converted to show the time delta betweeneach printk line and the next. When run with the '-b' option, all timesare relative to a single (base) point in time.
Options: -h Show this usage help. -b <base> Specify a base for time references. <base> can be a number or a string. If it is a string, the first message line which matches (at the beginning of the line) is used as the time reference.
ex: $ dmesg >timefile $ show_delta -b NET4 timefile
will show times relative to the line in the kernel outputstarting with "NET4".""") sys.exit(1)
# returns a tuple containing the seconds and text for each message line# seconds is returned as a float# raise an exception if no timing data was founddef get_time(line): if line[0]!="[": raise ValueError
# split on closing bracket (time_str, rest) = string.split(line[1:],']',1) time = string.atof(time_str)
#print "time=", time return (time, rest)
# average line looks like:# [ 0.084282] VFS: Mounted root (romfs filesystem) readonly# time data is expressed in seconds.useconds,# convert_line adds a delta for each linelast_time = 0.0def convert_line(line, base_time): global last_time
try: (time, rest) = get_time(line) except: # if any problem parsing time, don't convert anything return line
if base_time: # show time from base delta = time - base_time else: # just show time from last line delta = time - last_time last_time = time
return ("[%5.6f < %5.6f >]" % (time, delta)) + rest
def main(): base_str = "" filein = "" for arg in sys.argv[1:]: if arg=="-b": base_str = sys.argv[sys.argv.index("-b")+1] elif arg=="-h": usage() else: filein = arg
if not filein: usage()
try: lines = open(filein,"r").readlines() except: print ("Problem opening file: %s" % filein) sys.exit(1)
if base_str: print ('base= "%s"' % base_str) # assume a numeric base. If that fails, try searching # for a matching line. try: base_time = float(base_str) except: # search for line matching <base> string found = 0 for line in lines: try: (time, rest) = get_time(line) except: continue if string.find(rest, base_str)==1: base_time = time found = 1 # stop at first match break if not found: print ('Couldn\'t find line matching base pattern "%s"' % base_str) sys.exit(1) else: base_time = 0.0
for line in lines: print (convert_line(line, base_time),)
if __name__ == "__main__": main()