1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
#! /usr/bin/python2
#
# Copyright 2016 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
import argparse
import collections
import os
import subprocess
import sys
__DESCRIPTION = """
Processes a perf.data sample file and annotates the hottest instructions in a
given bytecode handler.
"""
__HELP_EPILOGUE = """
Note:
This tool uses the disassembly of interpreter's bytecode handler codegen
from out/<arch>.debug/d8. you should ensure that this binary is in-sync with
the version used to generate the perf profile.
Also, the tool depends on the symbol offsets from perf samples being accurate.
As such, you should use the ":pp" suffix for events.
Examples:
EVENT_TYPE=cycles:pp tools/run-perf.sh out/x64.release/d8
tools/ignition/linux_perf_bytecode_annotate.py Add
"""
def bytecode_offset_generator(perf_stream, bytecode_name):
skip_until_end_of_chain = False
bytecode_symbol = "BytecodeHandler:" + bytecode_name;
for line in perf_stream:
# Lines starting with a "#" are comments, skip them.
if line[0] == "#":
continue
line = line.strip()
# Empty line signals the end of the callchain.
if not line:
skip_until_end_of_chain = False
continue
if skip_until_end_of_chain:
continue
symbol_and_offset = line.split(" ", 1)[1]
if symbol_and_offset.startswith("BytecodeHandler:"):
skip_until_end_of_chain = True
if symbol_and_offset.startswith(bytecode_symbol):
yield int(symbol_and_offset.split("+", 1)[1], 16)
def bytecode_offset_counts(bytecode_offsets):
offset_counts = collections.defaultdict(int)
for offset in bytecode_offsets:
offset_counts[offset] += 1
return offset_counts
def bytecode_disassembly_generator(ignition_codegen, bytecode_name):
name_string = "name = " + bytecode_name
for line in ignition_codegen:
if line.startswith(name_string):
break
# Found the bytecode disassembly.
for line in ignition_codegen:
line = line.strip()
# Blank line marks the end of the bytecode's disassembly.
if not line:
return
# Only yield disassembly output.
if not line.startswith("0x"):
continue
yield line
def print_disassembly_annotation(offset_counts, bytecode_disassembly):
total = sum(offset_counts.values())
offsets = sorted(offset_counts, reverse=True)
def next_offset():
return offsets.pop() if offsets else -1
current_offset = next_offset()
print current_offset;
for line in bytecode_disassembly:
disassembly_offset = int(line.split()[1])
if disassembly_offset == current_offset:
count = offset_counts[current_offset]
percentage = 100.0 * count / total
print "{:>8d} ({:>5.1f}%) ".format(count, percentage),
current_offset = next_offset()
else:
print " ",
print line
if offsets:
print ("WARNING: Offsets not empty. Output is most likely invalid due to "
"a mismatch between perf output and debug d8 binary.")
def parse_command_line():
command_line_parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description=__DESCRIPTION,
epilog=__HELP_EPILOGUE)
command_line_parser.add_argument(
"--arch", "-a",
help="The architecture (default: x64)",
default="x64",
)
command_line_parser.add_argument(
"--input", "-i",
help="perf sample file to process (default: perf.data)",
default="perf.data",
metavar="<perf filename>",
dest="perf_filename"
)
command_line_parser.add_argument(
"--output", "-o",
help="output file name (stdout if omitted)",
type=argparse.FileType("wt"),
default=sys.stdout,
metavar="<output filename>",
dest="output_stream"
)
command_line_parser.add_argument(
"bytecode_name",
metavar="<bytecode name>",
nargs="?",
help="The bytecode handler to annotate"
)
return command_line_parser.parse_args()
def main():
program_options = parse_command_line()
perf = subprocess.Popen(["perf", "script", "-f", "ip,sym,symoff",
"-i", program_options.perf_filename],
stdout=subprocess.PIPE)
v8_root_path = os.path.dirname(__file__) + "/../../"
d8_path = "{}/out/{}.debug/d8".format(v8_root_path, program_options.arch)
d8_codegen = subprocess.Popen([d8_path, "--ignition",
"--trace-ignition-codegen", "-e", "1"],
stdout=subprocess.PIPE)
bytecode_offsets = bytecode_offset_generator(
perf.stdout, program_options.bytecode_name)
offset_counts = bytecode_offset_counts(bytecode_offsets)
bytecode_disassembly = bytecode_disassembly_generator(
d8_codegen.stdout, program_options.bytecode_name)
print_disassembly_annotation(offset_counts, bytecode_disassembly)
if __name__ == "__main__":
main()
|
