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Linux/scripts/show_delta

  1 #!/usr/bin/python
  2 #
  3 # show_deltas: Read list of printk messages instrumented with
  4 # time data, and format with time deltas.
  5 #
  6 # Also, you can show the times relative to a fixed point.
  7 #
  8 # Copyright 2003 Sony Corporation
  9 #
 10 # GPL 2.0 applies.
 11 
 12 import sys
 13 import string
 14 
 15 def usage():
 16         print ("""usage: show_delta [<options>] <filename>
 17 
 18 This program parses the output from a set of printk message lines which
 19 have time data prefixed because the CONFIG_PRINTK_TIME option is set, or
 20 the kernel command line option "time" is specified. When run with no
 21 options, the time information is converted to show the time delta between
 22 each printk line and the next.  When run with the '-b' option, all times
 23 are relative to a single (base) point in time.
 24 
 25 Options:
 26   -h            Show this usage help.
 27   -b <base>     Specify a base for time references.
 28                 <base> can be a number or a string.
 29                 If it is a string, the first message line
 30                 which matches (at the beginning of the
 31                 line) is used as the time reference.
 32 
 33 ex: $ dmesg >timefile
 34     $ show_delta -b NET4 timefile
 35 
 36 will show times relative to the line in the kernel output
 37 starting with "NET4".
 38 """)
 39         sys.exit(1)
 40 
 41 # returns a tuple containing the seconds and text for each message line
 42 # seconds is returned as a float
 43 # raise an exception if no timing data was found
 44 def get_time(line):
 45         if line[0]!="[":
 46                 raise ValueError
 47 
 48         # split on closing bracket
 49         (time_str, rest) = string.split(line[1:],']',1)
 50         time = string.atof(time_str)
 51 
 52         #print "time=", time
 53         return (time, rest)
 54 
 55 
 56 # average line looks like:
 57 # [    0.084282] VFS: Mounted root (romfs filesystem) readonly
 58 # time data is expressed in seconds.useconds,
 59 # convert_line adds a delta for each line
 60 last_time = 0.0
 61 def convert_line(line, base_time):
 62         global last_time
 63 
 64         try:
 65                 (time, rest) = get_time(line)
 66         except:
 67                 # if any problem parsing time, don't convert anything
 68                 return line
 69 
 70         if base_time:
 71                 # show time from base
 72                 delta = time - base_time
 73         else:
 74                 # just show time from last line
 75                 delta = time - last_time
 76                 last_time = time
 77 
 78         return ("[%5.6f < %5.6f >]" % (time, delta)) + rest
 79 
 80 def main():
 81         base_str = ""
 82         filein = ""
 83         for arg in sys.argv[1:]:
 84                 if arg=="-b":
 85                         base_str = sys.argv[sys.argv.index("-b")+1]
 86                 elif arg=="-h":
 87                         usage()
 88                 else:
 89                         filein = arg
 90 
 91         if not filein:
 92                 usage()
 93 
 94         try:
 95                 lines = open(filein,"r").readlines()
 96         except:
 97                 print ("Problem opening file: %s" % filein)
 98                 sys.exit(1)
 99 
100         if base_str:
101                 print ('base= "%s"' % base_str)
102                 # assume a numeric base.  If that fails, try searching
103                 # for a matching line.
104                 try:
105                         base_time = float(base_str)
106                 except:
107                         # search for line matching <base> string
108                         found = 0
109                         for line in lines:
110                                 try:
111                                         (time, rest) = get_time(line)
112                                 except:
113                                         continue
114                                 if string.find(rest, base_str)==1:
115                                         base_time = time
116                                         found = 1
117                                         # stop at first match
118                                         break
119                         if not found:
120                                 print ('Couldn\'t find line matching base pattern "%s"' % base_str)
121                                 sys.exit(1)
122         else:
123                 base_time = 0.0
124 
125         for line in lines:
126                 print (convert_line(line, base_time),)
127 
128 main()

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