1 #!/usr/bin/env python
2 # SPDX-License-Identifier: GPL-2.0-only
3 #
4 # show_deltas: Read list of printk messages in
5 # time data, and format with time deltas.
6 #
7 # Also, you can show the times relative to a f
8 #
9 # Copyright 2003 Sony Corporation
10 #
11
12 import sys
13 import string
14
15 def usage():
16 print ("""usage: show_delta [<options>
17
18 This program parses the output from a set of p
19 have time data prefixed because the CONFIG_PRI
20 the kernel command line option "time" is speci
21 options, the time information is converted to
22 each printk line and the next. When run with
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 refere
28 <base> can be a number or a st
29 If it is a string, the first m
30 which matches (at the beginnin
31 line) is used as the time refe
32
33 ex: $ dmesg >timefile
34 $ show_delta -b NET4 timefile
35
36 will show times relative to the line in the ke
37 starting with "NET4".
38 """)
39 sys.exit(1)
40
41 # returns a tuple containing the seconds and t
42 # seconds is returned as a float
43 # raise an exception if no timing data was fou
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
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 file
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,
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 lin
75 delta = time - last_time
76 last_time = time
77
78 return ("[%5.6f < %5.6f >]" % (time, d
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[sy
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").readl
96 except:
97 print ("Problem opening file:
98 sys.exit(1)
99
100 if base_str:
101 print ('base= "%s"' % base_str
102 # assume a numeric base. If t
103 # for a matching line.
104 try:
105 base_time = float(base
106 except:
107 # search for line matc
108 found = 0
109 for line in lines:
110 try:
111 (time,
112 except:
113 contin
114 if string.find
115 base_t
116 found
117 # stop
118 break
119 if not found:
120 print ('Couldn
121 sys.exit(1)
122 else:
123 base_time = 0.0
124
125 for line in lines:
126 print (convert_line(line, base
127
128 if __name__ == "__main__":
129 main()
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