130 lines
3.5 KiB
Python
Executable File
130 lines
3.5 KiB
Python
Executable File
#!/usr/bin/env python
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# SPDX-License-Identifier: GPL-2.0-only
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"""
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Copyright 2008 (c) Frederic Weisbecker <fweisbec@gmail.com>
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This script parses a trace provided by the function tracer in
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kernel/trace/trace_functions.c
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The resulted trace is processed into a tree to produce a more human
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view of the call stack by drawing textual but hierarchical tree of
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calls. Only the functions's names and the call time are provided.
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Usage:
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Be sure that you have CONFIG_FUNCTION_TRACER
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# mount -t tracefs nodev /sys/kernel/tracing
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# echo function > /sys/kernel/tracing/current_tracer
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$ cat /sys/kernel/tracing/trace_pipe > ~/raw_trace_func
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Wait some times but not too much, the script is a bit slow.
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Break the pipe (Ctrl + Z)
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$ scripts/tracing/draw_functrace.py < ~/raw_trace_func > draw_functrace
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Then you have your drawn trace in draw_functrace
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"""
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import sys, re
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class CallTree:
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""" This class provides a tree representation of the functions
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call stack. If a function has no parent in the kernel (interrupt,
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syscall, kernel thread...) then it is attached to a virtual parent
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called ROOT.
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"""
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ROOT = None
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def __init__(self, func, time = None, parent = None):
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self._func = func
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self._time = time
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if parent is None:
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self._parent = CallTree.ROOT
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else:
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self._parent = parent
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self._children = []
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def calls(self, func, calltime):
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""" If a function calls another one, call this method to insert it
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into the tree at the appropriate place.
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@return: A reference to the newly created child node.
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"""
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child = CallTree(func, calltime, self)
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self._children.append(child)
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return child
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def getParent(self, func):
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""" Retrieve the last parent of the current node that
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has the name given by func. If this function is not
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on a parent, then create it as new child of root
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@return: A reference to the parent.
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"""
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tree = self
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while tree != CallTree.ROOT and tree._func != func:
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tree = tree._parent
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if tree == CallTree.ROOT:
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child = CallTree.ROOT.calls(func, None)
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return child
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return tree
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def __repr__(self):
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return self.__toString("", True)
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def __toString(self, branch, lastChild):
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if self._time is not None:
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s = "%s----%s (%s)\n" % (branch, self._func, self._time)
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else:
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s = "%s----%s\n" % (branch, self._func)
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i = 0
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if lastChild:
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branch = branch[:-1] + " "
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while i < len(self._children):
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if i != len(self._children) - 1:
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s += "%s" % self._children[i].__toString(branch +\
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" |", False)
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else:
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s += "%s" % self._children[i].__toString(branch +\
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" |", True)
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i += 1
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return s
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class BrokenLineException(Exception):
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"""If the last line is not complete because of the pipe breakage,
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we want to stop the processing and ignore this line.
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"""
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pass
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class CommentLineException(Exception):
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""" If the line is a comment (as in the beginning of the trace file),
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just ignore it.
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"""
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pass
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def parseLine(line):
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line = line.strip()
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if line.startswith("#"):
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raise CommentLineException
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m = re.match("[^]]+?\\] +([a-z.]+) +([0-9.]+): (\\w+) <-(\\w+)", line)
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if m is None:
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raise BrokenLineException
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return (m.group(2), m.group(3), m.group(4))
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def main():
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CallTree.ROOT = CallTree("Root (Nowhere)", None, None)
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tree = CallTree.ROOT
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for line in sys.stdin:
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try:
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calltime, callee, caller = parseLine(line)
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except BrokenLineException:
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break
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except CommentLineException:
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continue
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tree = tree.getParent(caller)
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tree = tree.calls(callee, calltime)
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print(CallTree.ROOT)
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if __name__ == "__main__":
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main()
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