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