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# flamegraph.py - create flame graphs from perf samples
# SPDX-License-Identifier: GPL-2.0
#
# Usage:
#
# perf record -a -g -F 99 sleep 60
# perf script report flamegraph
#
# Combined:
#
# perf script flamegraph -a -F 99 sleep 60
#
# Written by Andreas Gerstmayr <agerstmayr@redhat.com>
# Flame Graphs invented by Brendan Gregg <bgregg@netflix.com>
# Works in tandem with d3-flame-graph by Martin Spier <mspier@netflix.com>
from __future__ import print_function
import sys
import os
import argparse
import json
class Node:
def __init__(self, name, libtype=""):
self.name = name
self.libtype = libtype
self.value = 0
self.children = []
def toJSON(self):
return {
"n": self.name,
"l": self.libtype,
"v": self.value,
"c": self.children
}
class FlameGraphCLI:
def __init__(self, args):
self.args = args
self.stack = Node("root")
if self.args.format == "html" and \
not os.path.isfile(self.args.template):
print("Flame Graph template {} does not exist. Please install "
"the js-d3-flame-graph (RPM) or libjs-d3-flame-graph (deb) "
"package, specify an existing flame graph template "
"(--template PATH) or another output format "
"(--format FORMAT).".format(self.args.template),
file=sys.stderr)
sys.exit(1)
def find_or_create_node(self, node, name, dso):
libtype = "kernel" if dso == "[kernel.kallsyms]" else ""
if name is None:
name = "[unknown]"
for child in node.children:
if child.name == name and child.libtype == libtype:
return child
child = Node(name, libtype)
node.children.append(child)
return child
def process_event(self, event):
node = self.find_or_create_node(self.stack, event["comm"], None)
if "callchain" in event:
for entry in reversed(event['callchain']):
node = self.find_or_create_node(
node, entry.get("sym", {}).get("name"), event.get("dso"))
else:
node = self.find_or_create_node(
node, entry.get("symbol"), event.get("dso"))
node.value += 1
def trace_end(self):
json_str = json.dumps(self.stack, default=lambda x: x.toJSON())
if self.args.format == "html":
try:
with open(self.args.template) as f:
output_str = f.read().replace("/** @flamegraph_json **/",
json_str)
except IOError as e:
print("Error reading template file: {}".format(e), file=sys.stderr)
sys.exit(1)
output_fn = self.args.output or "flamegraph.html"
else:
output_str = json_str
output_fn = self.args.output or "stacks.json"
if output_fn == "-":
sys.stdout.write(output_str)
else:
print("dumping data to {}".format(output_fn))
try:
with open(output_fn, "w") as out:
out.write(output_str)
except IOError as e:
print("Error writing output file: {}".format(e), file=sys.stderr)
sys.exit(1)
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Create flame graphs.")
parser.add_argument("-f", "--format",
default="html", choices=["json", "html"],
help="output file format")
parser.add_argument("-o", "--output",
help="output file name")
parser.add_argument("--template",
default="/usr/share/d3-flame-graph/d3-flamegraph-base.html",
help="path to flamegraph HTML template")
parser.add_argument("-i", "--input",
help=argparse.SUPPRESS)
args = parser.parse_args()
cli = FlameGraphCLI(args)
process_event = cli.process_event
trace_end = cli.trace_end
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