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