Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/scripts/show_delta
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File size: 3057 byte(s)
Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File size: 3057 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | #!/usr/bin/env 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() |
129 |