Subversion Repositories test_project

#!/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 [<options>] <filename>

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 <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 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 <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),

main()