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128 lines
3.0 KiB
128 lines
3.0 KiB
#!/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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