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#!/usr/bin/env python

#

# 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

#

# GPL 2.0 applies.

import sys

import string

def usage():

        print """usage: show_delta [] 

This program parses the output from a set of printk message lines which

have time data prefixed because the CONFIG_PRINTK_TIME option is set, or

the kernel command line option "time" is specified. When run with no

options, the time information is converted to show the time delta between

each printk line and the next.  When run with the '-b' option, all times

are relative to a single (base) point in time.

Options:

  -h            Show this usage help.

  -b    Specify a base for time references.

                 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 output

starting 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 found

def 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 line

last_time = 0.0

def 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  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),

main()