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Copyright 2008 (c) Frederic Weisbecker <fweisbec@gmail.com>
Licensed under the terms of the GNU GPL License version 2
This script parses a trace provided by the function tracer in
kernel/trace/trace_functions.c
The resulted trace is processed into a tree to produce a more human
view of the call stack by drawing textual but hierarchical tree of
calls. Only the functions's names and the the call time are provided.
Usage:
Be sure that you have CONFIG_FUNCTION_TRACER
# mount -t debugfs nodev /sys/kernel/debug
# echo function > /sys/kernel/debug/tracing/current_tracer
$ cat /sys/kernel/debug/tracing/trace_pipe > ~/raw_trace_func
Wait some times but not too much, the script is a bit slow.
Break the pipe (Ctrl + Z)
$ scripts/draw_functrace.py < raw_trace_func > draw_functrace
Then you have your drawn trace in draw_functrace
iNt CallTreec B sG e Z d Z d Z d d d Z d Z d Z d Z d Z RS( s This class provides a tree representation of the functions
call stack. If a function has no parent in the kernel (interrupt,
syscall, kernel thread...) then it is attached to a virtual parent
called ROOT.
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| | _ g | _ d S( N( t _funct _timet NoneR t ROOTt _parentt _children( t selft funct timet parent( ( sK /usr/src/kernels/2.6.32-754.29.1.el6.i686/scripts/tracing/draw_functrace.pyt __init__# s
c C s& t | | | } | i i | | S( s If a function calls another one, call this method to insert it
into the tree at the appropriate place.
@return: A reference to the newly created child node.
( R R t append( R R t calltimet child( ( sK /usr/src/kernels/2.6.32-754.29.1.el6.i686/scripts/tracing/draw_functrace.pyt calls, s c C se | } x. | t i j o | i | j o
| i } q W| t i j o t i i | d } | S| S( s Retrieve the last parent of the current node that
has the name given by func. If this function is not
on a parent, then create it as new child of root
@return: A reference to the parent.
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__module__t __doc__R R R R R R R ( ( ( sK /usr/src/kernels/2.6.32-754.29.1.el6.i686/scripts/tracing/draw_functrace.pyR s t BrokenLineExceptionc B s e Z d Z RS( sy If the last line is not complete because of the pipe breakage,
we want to stop the processing and ignore this line.
( R R R ( ( ( sK /usr/src/kernels/2.6.32-754.29.1.el6.i686/scripts/tracing/draw_functrace.pyR! Y s t CommentLineExceptionc B s e Z d Z RS( sY If the line is a comment (as in the beginning of the trace file),
just ignore it.
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