1 files changed, 129 insertions, 0 deletions

diff --git a/scripts/show_delta b/scripts/show_delta
new file mode 100644
index 000000000000..48a706ab3d0c
--- /dev/null
+++ b/scripts/show_delta
@@ -0,0 +1,129 @@
+#!/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()
+