Date:	Sun, 26 Oct 2008 22:20:57 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH][RESEND] ftrace: Add a script to produce a hierarchical view
 of a function trace

This script parses a function trace and then produces a hierarchical view of the 
function call stack after processing it into a tree.

You can see the result on attachment. You will find the raw trace and the hierarchical view.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
diff --git a/scripts/draw_functrace.py b/scripts/draw_functrace.py
new file mode 100755
index 0000000..e6496bd
--- /dev/null
+++ b/scripts/draw_functrace.py
@@ -0,0 +1,119 @@
+#!/usr/bin/python
+
+"""
+Copyright 2008 (c) Frederic Weisbecker <fweisbec@...il.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
+	# mkdir /debugfs
+	# mount -t debug debug /debug
+	# echo function > /debug/tracing/current_tracer
+	# cat /debug/tracing/current_tracer > ~/raw_trace_func
+	Wait some times but not too much, the scripts 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
+"""
+
+
+import sys, re
+
+class CallTree:
+	""" 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.
+	"""
+	ROOT = None
+
+	def __init__(self, func, time = None, parent = None):
+		self._func = func
+		self._time = time
+		if parent is None:
+			self._parent = CallTree.ROOT
+		else:
+			self._parent = parent
+		self._children = []
+
+	def calls(self, func, calltime):
+		""" 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.
+		"""
+		child = CallTree(func, calltime, self)
+		self._children.append(child)
+		return child
+
+	def getParent(self, func):
+		""" 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.
+		"""
+		tree = self
+		while tree != CallTree.ROOT and tree._func != func:
+			tree = tree._parent
+		if tree == CallTree.ROOT:
+			child = CallTree.ROOT.calls(func, None)
+			return child
+		return tree
+
+	def __repr__(self):
+		return self.__toString("", True)
+
+	def __toString(self, branch, lastChild):
+		if self._time is not None:
+			s = "%s----%s (%s)\n" % (branch, self._func, self._time)
+		else:
+			s = "%s----%s\n" % (branch, self._func)
+
+		i = 0
+		if lastChild:
+			branch = branch[:-1] + " "
+		while i < len(self._children):
+			if i != len(self._children) - 1:
+				s += "%s" % self._children[i].__toString(branch +\
+									 "    |", False)
+			else:
+				s += "%s" % self._children[i].__toString(branch +\
+									 "    |", True)
+			i += 1
+		return s
+
+class BrokenLineException(Exception):
+	"""If the last line is not complete because of the pipe breakage,
+	   we want to stop the processing and ignore this line.
+	"""
+	pass
+
+
+def parseLine(line):
+	m = re.match("[^]]+?\\]   ([0-9.]+): (\\w+) <-(\\w+)", line.strip())
+	if m is None:
+		raise BrokenLineException
+	return (m.group(1), m.group(2), m.group(3))
+
+
+def main():
+	CallTree.ROOT = CallTree("Root (Nowhere)", None, None)
+	tree = CallTree.ROOT
+
+	for line in sys.stdin:
+		try:
+			calltime, callee, caller = parseLine(line)
+		except BrokenLineException:
+			break
+		tree = tree.getParent(caller)
+		tree = tree.calls(callee, calltime)
+
+	print CallTree.ROOT
+
+if __name__ == "__main__":
+	main()

View attachment "trace.func" of type "text/plain" (176563 bytes)

View attachment "machin.log" of type "text/x-log" (143072 bytes)

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