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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /scripts/show_delta
downloadlinux-2.6.34-ux500-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+#!/usr/bin/env python
+#
+# show_deltas: Read list of printk messages instrumented with
+# time data, and format with time deltas.
+#
+# Also, you can show the times relative to a fixed point.
+#
+# Copyright 2003 Sony Corporation
+#
+# GPL 2.0 applies.
+
+import sys
+import string
+
+def usage():
+ print """usage: show_delta [<options>] <filename>
+
+This program parses the output from a set of printk message lines which
+have time data prefixed because the CONFIG_PRINTK_TIME option is set, or
+the kernel command line option "time" is specified. When run with no
+options, the time information is converted to show the time delta between
+each printk line and the next. When run with the '-b' option, all times
+are relative to a single (base) point in time.
+
+Options:
+ -h Show this usage help.
+ -b <base> Specify a base for time references.
+ <base> can be a number or a string.
+ If it is a string, the first message line
+ which matches (at the beginning of the
+ line) is used as the time reference.
+
+ex: $ dmesg >timefile
+ $ show_delta -b NET4 timefile
+
+will show times relative to the line in the kernel output
+starting with "NET4".
+"""
+ sys.exit(1)
+
+# returns a tuple containing the seconds and text for each message line
+# seconds is returned as a float
+# raise an exception if no timing data was found
+def get_time(line):
+ if line[0]!="[":
+ raise ValueError
+
+ # split on closing bracket
+ (time_str, rest) = string.split(line[1:],']',1)
+ time = string.atof(time_str)
+
+ #print "time=", time
+ return (time, rest)
+
+
+# average line looks like:
+# [ 0.084282] VFS: Mounted root (romfs filesystem) readonly
+# time data is expressed in seconds.useconds,
+# convert_line adds a delta for each line
+last_time = 0.0
+def convert_line(line, base_time):
+ global last_time
+
+ try:
+ (time, rest) = get_time(line)
+ except:
+ # if any problem parsing time, don't convert anything
+ return line
+
+ if base_time:
+ # show time from base
+ delta = time - base_time
+ else:
+ # just show time from last line
+ delta = time - last_time
+ last_time = time
+
+ return ("[%5.6f < %5.6f >]" % (time, delta)) + rest
+
+def main():
+ base_str = ""
+ filein = ""
+ for arg in sys.argv[1:]:
+ if arg=="-b":
+ base_str = sys.argv[sys.argv.index("-b")+1]
+ elif arg=="-h":
+ usage()
+ else:
+ filein = arg
+
+ if not filein:
+ usage()
+
+ try:
+ lines = open(filein,"r").readlines()
+ except:
+ print "Problem opening file: %s" % filein
+ sys.exit(1)
+
+ if base_str:
+ print 'base= "%s"' % base_str
+ # assume a numeric base. If that fails, try searching
+ # for a matching line.
+ try:
+ base_time = float(base_str)
+ except:
+ # search for line matching <base> string
+ found = 0
+ for line in lines:
+ try:
+ (time, rest) = get_time(line)
+ except:
+ continue
+ if string.find(rest, base_str)==1:
+ base_time = time
+ found = 1
+ # stop at first match
+ break
+ if not found:
+ print 'Couldn\'t find line matching base pattern "%s"' % base_str
+ sys.exit(1)
+ else:
+ base_time = 0.0
+
+ for line in lines:
+ print convert_line(line, base_time),
+
+main()
+