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v8/tools/profiling/ll_prof.py
Michael Achenbach 6ea78398aa [infra] Change all Python shebangs to Python3 
The infrastructure runs everything already in Python3, so this is
mostly a clean-up.

For MB, a python2 holdover was removed and new lint errors were
fixed.

The renames were automated with:
git grep -e "/usr/bin/python$" |
  cut -d':' -f1 |
  xargs
  sed -i 's/#!\/usr\/bin\/python$/#!\/usr\/bin\/python3/1'

and
git grep -e "/usr/bin/env python$" |
  cut -d':' -f1 |
  xargs
  sed -i 's/#!\/usr\/bin\/env python$/#!\/usr\/bin\/env python3/1'

Bug: v8:13148
Change-Id: If4f3c7635e72fa134798d55314ac1aa92ddd01bf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3811499
Reviewed-by: Liviu Rau <liviurau@google.com>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82231}
2022-08-05 14:55:00 +00:00

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#!/usr/bin/env python3
#
# Copyright 2012 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# for py2/py3 compatibility
from __future__ import print_function
import bisect
import collections
import ctypes
import disasm
import mmap
import optparse
import os
import re
import subprocess
import sys
import time
USAGE="""usage: %prog [OPTION]...
Analyses V8 and perf logs to produce profiles.
Perf logs can be collected using a command like:
$ perf record -R -e cycles -c 10000 -f -i ./d8 bench.js --ll-prof
# -R: collect all data
# -e cycles: use cpu-cycles event (run "perf list" for details)
# -c 10000: write a sample after each 10000 events
# -f: force output file overwrite
# -i: limit profiling to our process and the kernel
# --ll-prof shell flag enables the right V8 logs
This will produce a binary trace file (perf.data) that %prog can analyse.
IMPORTANT:
The kernel has an internal maximum for events per second, it is 100K by
default. That's not enough for "-c 10000". Set it to some higher value:
$ echo 10000000 | sudo tee /proc/sys/kernel/perf_event_max_sample_rate
You can also make the warning about kernel address maps go away:
$ echo 0 | sudo tee /proc/sys/kernel/kptr_restrict
We have a convenience script that handles all of the above for you:
$ tools/run-llprof.sh ./d8 bench.js
Examples:
# Print flat profile with annotated disassembly for the 10 top
# symbols. Use default log names.
$ %prog --disasm-top=10
# Print flat profile with annotated disassembly for all used symbols.
# Use default log names and include kernel symbols into analysis.
$ %prog --disasm-all --kernel
# Print flat profile. Use custom log names.
$ %prog --log=foo.log --trace=foo.data
"""
JS_ORIGIN = "js"
class Code(object):
"""Code object."""
_id = 0
UNKNOWN = 0
V8INTERNAL = 1
FULL_CODEGEN = 2
OPTIMIZED = 3
def __init__(self, name, start_address, end_address, origin, origin_offset):
self.id = Code._id
Code._id += 1
self.name = name
self.other_names = None
self.start_address = start_address
self.end_address = end_address
self.origin = origin
self.origin_offset = origin_offset
self.self_ticks = 0
self.self_ticks_map = None
self.callee_ticks = None
if name.startswith("LazyCompile:*"):
self.codetype = Code.OPTIMIZED
elif name.startswith("LazyCompile:"):
self.codetype = Code.FULL_CODEGEN
elif name.startswith("v8::internal::"):
self.codetype = Code.V8INTERNAL
else:
self.codetype = Code.UNKNOWN
def AddName(self, name):
assert self.name != name
if self.other_names is None:
self.other_names = [name]
return
if not name in self.other_names:
self.other_names.append(name)
def FullName(self):
if self.other_names is None:
return self.name
self.other_names.sort()
return "%s (aka %s)" % (self.name, ", ".join(self.other_names))
def IsUsed(self):
return self.self_ticks > 0 or self.callee_ticks is not None
def Tick(self, pc):
self.self_ticks += 1
if self.self_ticks_map is None:
self.self_ticks_map = collections.defaultdict(lambda: 0)
offset = pc - self.start_address
self.self_ticks_map[offset] += 1
def CalleeTick(self, callee):
if self.callee_ticks is None:
self.callee_ticks = collections.defaultdict(lambda: 0)
self.callee_ticks[callee] += 1
def PrintAnnotated(self, arch, options):
if self.self_ticks_map is None:
ticks_map = []
else:
ticks_map = self.self_ticks_map.items()
# Convert the ticks map to offsets and counts arrays so that later
# we can do binary search in the offsets array.
ticks_map.sort(key=lambda t: t[0])
ticks_offsets = [t[0] for t in ticks_map]
ticks_counts = [t[1] for t in ticks_map]
# Get a list of disassembled lines and their addresses.
lines = self._GetDisasmLines(arch, options)
if len(lines) == 0:
return
# Print annotated lines.
address = lines[0][0]
total_count = 0
for i in range(len(lines)):
start_offset = lines[i][0] - address
if i == len(lines) - 1:
end_offset = self.end_address - self.start_address
else:
end_offset = lines[i + 1][0] - address
# Ticks (reported pc values) are not always precise, i.e. not
# necessarily point at instruction starts. So we have to search
# for ticks that touch the current instruction line.
j = bisect.bisect_left(ticks_offsets, end_offset)
count = 0
for offset, cnt in reversed(zip(ticks_offsets[:j], ticks_counts[:j])):
if offset < start_offset:
break
count += cnt
total_count += count
percent = 100.0 * count / self.self_ticks
offset = lines[i][0]
if percent >= 0.01:
# 5 spaces for tick count
# 1 space following
# 1 for '|'
# 1 space following
# 6 for the percentage number, incl. the '.'
# 1 for the '%' sign
# => 15
print("%5d | %6.2f%% %x(%d): %s" % (count, percent, offset, offset, lines[i][1]))
else:
print("%s %x(%d): %s" % (" " * 15, offset, offset, lines[i][1]))
print()
assert total_count == self.self_ticks, \
"Lost ticks (%d != %d) in %s" % (total_count, self.self_ticks, self)
def __str__(self):
return "%s [0x%x, 0x%x) size: %d origin: %s" % (
self.name,
self.start_address,
self.end_address,
self.end_address - self.start_address,
self.origin)
def _GetDisasmLines(self, arch, options):
if self.origin == JS_ORIGIN:
inplace = False
filename = options.log + ".ll"
else:
inplace = True
filename = self.origin
return disasm.GetDisasmLines(filename,
self.origin_offset,
self.end_address - self.start_address,
arch,
inplace)
class CodePage(object):
"""Group of adjacent code objects."""
SHIFT = 20 # 1M pages
SIZE = (1 << SHIFT)
MASK = ~(SIZE - 1)
@staticmethod
def PageAddress(address):
return address & CodePage.MASK
@staticmethod
def PageId(address):
return address >> CodePage.SHIFT
@staticmethod
def PageAddressFromId(id):
return id << CodePage.SHIFT
def __init__(self, address):
self.address = address
self.code_objects = []
def Add(self, code):
self.code_objects.append(code)
def Remove(self, code):
self.code_objects.remove(code)
def Find(self, pc):
code_objects = self.code_objects
for i, code in enumerate(code_objects):
if code.start_address <= pc < code.end_address:
code_objects[0], code_objects[i] = code, code_objects[0]
return code
return None
def __iter__(self):
return self.code_objects.__iter__()
class CodeMap(object):
"""Code object map."""
def __init__(self):
self.pages = {}
self.min_address = 1 << 64
self.max_address = -1
def Add(self, code, max_pages=-1):
page_id = CodePage.PageId(code.start_address)
limit_id = CodePage.PageId(code.end_address + CodePage.SIZE - 1)
pages = 0
while page_id < limit_id:
if max_pages >= 0 and pages > max_pages:
print("Warning: page limit (%d) reached for %s [%s]" % (
max_pages, code.name, code.origin), file=sys.stderr)
break
if page_id in self.pages:
page = self.pages[page_id]
else:
page = CodePage(CodePage.PageAddressFromId(page_id))
self.pages[page_id] = page
page.Add(code)
page_id += 1
pages += 1
self.min_address = min(self.min_address, code.start_address)
self.max_address = max(self.max_address, code.end_address)
def Remove(self, code):
page_id = CodePage.PageId(code.start_address)
limit_id = CodePage.PageId(code.end_address + CodePage.SIZE - 1)
removed = False
while page_id < limit_id:
if page_id not in self.pages:
page_id += 1
continue
page = self.pages[page_id]
page.Remove(code)
removed = True
page_id += 1
return removed
def AllCode(self):
for page in self.pages.itervalues():
for code in page:
if CodePage.PageAddress(code.start_address) == page.address:
yield code
def UsedCode(self):
for code in self.AllCode():
if code.IsUsed():
yield code
def Print(self):
for code in self.AllCode():
print(code)
def Find(self, pc):
if pc < self.min_address or pc >= self.max_address:
return None
page_id = CodePage.PageId(pc)
if page_id not in self.pages:
return None
return self.pages[page_id].Find(pc)
class CodeInfo(object):
"""Generic info about generated code objects."""
def __init__(self, arch, header_size):
self.arch = arch
self.header_size = header_size
class LogReader(object):
"""V8 low-level (binary) log reader."""
_ARCH_TO_POINTER_TYPE_MAP = {
"ia32": ctypes.c_uint32,
"arm": ctypes.c_uint32,
"mips": ctypes.c_uint32,
"x64": ctypes.c_uint64,
"arm64": ctypes.c_uint64
}
_CODE_CREATE_TAG = "C"
_CODE_MOVE_TAG = "M"
_CODE_MOVING_GC_TAG = "G"
def __init__(self, log_name, code_map):
self.log_file = open(log_name, "r")
self.log = mmap.mmap(self.log_file.fileno(), 0, mmap.MAP_PRIVATE)
self.log_pos = 0
self.code_map = code_map
self.arch = self.log[:self.log.find("\0")]
self.log_pos += len(self.arch) + 1
assert self.arch in LogReader._ARCH_TO_POINTER_TYPE_MAP, \
"Unsupported architecture %s" % self.arch
pointer_type = LogReader._ARCH_TO_POINTER_TYPE_MAP[self.arch]
self.code_create_struct = LogReader._DefineStruct([
("name_size", ctypes.c_int32),
("code_address", pointer_type),
("code_size", ctypes.c_int32)])
self.code_move_struct = LogReader._DefineStruct([
("from_address", pointer_type),
("to_address", pointer_type)])
self.code_delete_struct = LogReader._DefineStruct([
("address", pointer_type)])
def ReadUpToGC(self):
while self.log_pos < self.log.size():
tag = self.log[self.log_pos]
self.log_pos += 1
if tag == LogReader._CODE_MOVING_GC_TAG:
return
if tag == LogReader._CODE_CREATE_TAG:
event = self.code_create_struct.from_buffer(self.log, self.log_pos)
self.log_pos += ctypes.sizeof(event)
start_address = event.code_address
end_address = start_address + event.code_size
name = self.log[self.log_pos:self.log_pos + event.name_size]
origin = JS_ORIGIN
self.log_pos += event.name_size
origin_offset = self.log_pos
self.log_pos += event.code_size
code = Code(name, start_address, end_address, origin, origin_offset)
conficting_code = self.code_map.Find(start_address)
if conficting_code:
if not (conficting_code.start_address == code.start_address and
conficting_code.end_address == code.end_address):
self.code_map.Remove(conficting_code)
else:
LogReader._HandleCodeConflict(conficting_code, code)
# TODO(vitalyr): this warning is too noisy because of our
# attempts to reconstruct code log from the snapshot.
# print >>sys.stderr, \
# "Warning: Skipping duplicate code log entry %s" % code
continue
self.code_map.Add(code)
continue
if tag == LogReader._CODE_MOVE_TAG:
event = self.code_move_struct.from_buffer(self.log, self.log_pos)
self.log_pos += ctypes.sizeof(event)
old_start_address = event.from_address
new_start_address = event.to_address
if old_start_address == new_start_address:
# Skip useless code move entries.
continue
code = self.code_map.Find(old_start_address)
if not code:
print("Warning: Not found %x" % old_start_address, file=sys.stderr)
continue
assert code.start_address == old_start_address, \
"Inexact move address %x for %s" % (old_start_address, code)
self.code_map.Remove(code)
size = code.end_address - code.start_address
code.start_address = new_start_address
code.end_address = new_start_address + size
self.code_map.Add(code)
continue
assert False, "Unknown tag %s" % tag
def Dispose(self):
self.log.close()
self.log_file.close()
@staticmethod
def _DefineStruct(fields):
class Struct(ctypes.Structure):
_fields_ = fields
return Struct
@staticmethod
def _HandleCodeConflict(old_code, new_code):
assert (old_code.start_address == new_code.start_address and
old_code.end_address == new_code.end_address), \
"Conficting code log entries %s and %s" % (old_code, new_code)
if old_code.name == new_code.name:
return
# Code object may be shared by a few functions. Collect the full
# set of names.
old_code.AddName(new_code.name)
class Descriptor(object):
"""Descriptor of a structure in the binary trace log."""
CTYPE_MAP = {
"u16": ctypes.c_uint16,
"u32": ctypes.c_uint32,
"u64": ctypes.c_uint64
}
def __init__(self, fields):
class TraceItem(ctypes.Structure):
_fields_ = Descriptor.CtypesFields(fields)
def __str__(self):
return ", ".join("%s: %s" % (field, self.__getattribute__(field))
for field, _ in TraceItem._fields_)
self.ctype = TraceItem
def Read(self, trace, offset):
return self.ctype.from_buffer(trace, offset)
@staticmethod
def CtypesFields(fields):
return [(field, Descriptor.CTYPE_MAP[format]) for (field, format) in fields]
# Please see http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=tree;f=tools/perf
# for the gory details.
# Reference: struct perf_file_header in kernel/tools/perf/util/header.h
TRACE_HEADER_DESC = Descriptor([
("magic", "u64"),
("size", "u64"),
("attr_size", "u64"),
("attrs_offset", "u64"),
("attrs_size", "u64"),
("data_offset", "u64"),
("data_size", "u64"),
("event_types_offset", "u64"),
("event_types_size", "u64")
])
# Reference: /usr/include/linux/perf_event.h
PERF_EVENT_ATTR_DESC = Descriptor([
("type", "u32"),
("size", "u32"),
("config", "u64"),
("sample_period_or_freq", "u64"),
("sample_type", "u64"),
("read_format", "u64"),
("flags", "u64"),
("wakeup_events_or_watermark", "u32"),
("bp_type", "u32"),
("bp_addr", "u64"),
("bp_len", "u64")
])
# Reference: /usr/include/linux/perf_event.h
PERF_EVENT_HEADER_DESC = Descriptor([
("type", "u32"),
("misc", "u16"),
("size", "u16")
])
# Reference: kernel/tools/perf/util/event.h
PERF_MMAP_EVENT_BODY_DESC = Descriptor([
("pid", "u32"),
("tid", "u32"),
("addr", "u64"),
("len", "u64"),
("pgoff", "u64")
])
# Reference: kernel/tools/perf/util/event.h
PERF_MMAP2_EVENT_BODY_DESC = Descriptor([
("pid", "u32"),
("tid", "u32"),
("addr", "u64"),
("len", "u64"),
("pgoff", "u64"),
("maj", "u32"),
("min", "u32"),
("ino", "u64"),
("ino_generation", "u64"),
("prot", "u32"),
("flags","u32")
])
# perf_event_attr.sample_type bits control the set of
# perf_sample_event fields.
PERF_SAMPLE_IP = 1 << 0
PERF_SAMPLE_TID = 1 << 1
PERF_SAMPLE_TIME = 1 << 2
PERF_SAMPLE_ADDR = 1 << 3
PERF_SAMPLE_READ = 1 << 4
PERF_SAMPLE_CALLCHAIN = 1 << 5
PERF_SAMPLE_ID = 1 << 6
PERF_SAMPLE_CPU = 1 << 7
PERF_SAMPLE_PERIOD = 1 << 8
PERF_SAMPLE_STREAM_ID = 1 << 9
PERF_SAMPLE_RAW = 1 << 10
# Reference: /usr/include/perf_event.h, the comment for PERF_RECORD_SAMPLE.
PERF_SAMPLE_EVENT_BODY_FIELDS = [
("ip", "u64", PERF_SAMPLE_IP),
("pid", "u32", PERF_SAMPLE_TID),
("tid", "u32", PERF_SAMPLE_TID),
("time", "u64", PERF_SAMPLE_TIME),
("addr", "u64", PERF_SAMPLE_ADDR),
("id", "u64", PERF_SAMPLE_ID),
("stream_id", "u64", PERF_SAMPLE_STREAM_ID),
("cpu", "u32", PERF_SAMPLE_CPU),
("res", "u32", PERF_SAMPLE_CPU),
("period", "u64", PERF_SAMPLE_PERIOD),
# Don't want to handle read format that comes after the period and
# before the callchain and has variable size.
("nr", "u64", PERF_SAMPLE_CALLCHAIN)
# Raw data follows the callchain and is ignored.
]
PERF_SAMPLE_EVENT_IP_FORMAT = "u64"
PERF_RECORD_MMAP = 1
PERF_RECORD_MMAP2 = 10
PERF_RECORD_SAMPLE = 9
class TraceReader(object):
"""Perf (linux-2.6/tools/perf) trace file reader."""
_TRACE_HEADER_MAGIC = 4993446653023372624
def __init__(self, trace_name):
self.trace_file = open(trace_name, "r")
self.trace = mmap.mmap(self.trace_file.fileno(), 0, mmap.MAP_PRIVATE)
self.trace_header = TRACE_HEADER_DESC.Read(self.trace, 0)
if self.trace_header.magic != TraceReader._TRACE_HEADER_MAGIC:
print("Warning: unsupported trace header magic", file=sys.stderr)
self.offset = self.trace_header.data_offset
self.limit = self.trace_header.data_offset + self.trace_header.data_size
assert self.limit <= self.trace.size(), \
"Trace data limit exceeds trace file size"
self.header_size = ctypes.sizeof(PERF_EVENT_HEADER_DESC.ctype)
assert self.trace_header.attrs_size != 0, \
"No perf event attributes found in the trace"
perf_event_attr = PERF_EVENT_ATTR_DESC.Read(self.trace,
self.trace_header.attrs_offset)
self.sample_event_body_desc = self._SampleEventBodyDesc(
perf_event_attr.sample_type)
self.callchain_supported = \
(perf_event_attr.sample_type & PERF_SAMPLE_CALLCHAIN) != 0
if self.callchain_supported:
self.ip_struct = Descriptor.CTYPE_MAP[PERF_SAMPLE_EVENT_IP_FORMAT]
self.ip_size = ctypes.sizeof(self.ip_struct)
def ReadEventHeader(self):
if self.offset >= self.limit:
return None, 0
offset = self.offset
header = PERF_EVENT_HEADER_DESC.Read(self.trace, self.offset)
self.offset += header.size
return header, offset
def ReadMmap(self, header, offset):
mmap_info = PERF_MMAP_EVENT_BODY_DESC.Read(self.trace,
offset + self.header_size)
# Read null-terminated filename.
filename = self.trace[offset + self.header_size + ctypes.sizeof(mmap_info):
offset + header.size]
mmap_info.filename = HOST_ROOT + filename[:filename.find(chr(0))]
return mmap_info
def ReadMmap2(self, header, offset):
mmap_info = PERF_MMAP2_EVENT_BODY_DESC.Read(self.trace,
offset + self.header_size)
# Read null-terminated filename.
filename = self.trace[offset + self.header_size + ctypes.sizeof(mmap_info):
offset + header.size]
mmap_info.filename = HOST_ROOT + filename[:filename.find(chr(0))]
return mmap_info
def ReadSample(self, header, offset):
sample = self.sample_event_body_desc.Read(self.trace,
offset + self.header_size)
if not self.callchain_supported:
return sample
sample.ips = []
offset += self.header_size + ctypes.sizeof(sample)
for _ in range(sample.nr):
sample.ips.append(
self.ip_struct.from_buffer(self.trace, offset).value)
offset += self.ip_size
return sample
def Dispose(self):
self.trace.close()
self.trace_file.close()
def _SampleEventBodyDesc(self, sample_type):
assert (sample_type & PERF_SAMPLE_READ) == 0, \
"Can't hande read format in samples"
fields = [(field, format)
for (field, format, bit) in PERF_SAMPLE_EVENT_BODY_FIELDS
if (bit & sample_type) != 0]
return Descriptor(fields)
OBJDUMP_SECTION_HEADER_RE = re.compile(
r"^\s*\d+\s(\.\S+)\s+[a-f0-9]")
OBJDUMP_SYMBOL_LINE_RE = re.compile(
r"^([a-f0-9]+)\s(.{7})\s(\S+)\s+([a-f0-9]+)\s+(?:\.hidden\s+)?(.*)$")
OBJDUMP_DYNAMIC_SYMBOLS_START_RE = re.compile(
r"^DYNAMIC SYMBOL TABLE")
OBJDUMP_SKIP_RE = re.compile(
r"^.*ld\.so\.cache$")
KERNEL_ALLSYMS_FILE = "/proc/kallsyms"
PERF_KERNEL_ALLSYMS_RE = re.compile(
r".*kallsyms.*")
KERNEL_ALLSYMS_LINE_RE = re.compile(
r"^([a-f0-9]+)\s(?:t|T)\s(\S+)$")
class LibraryRepo(object):
def __init__(self):
self.infos = []
self.names = set()
self.ticks = {}
def HasDynamicSymbols(self, filename):
if filename.endswith(".ko"): return False
process = subprocess.Popen(
"%s -h %s" % (OBJDUMP_BIN, filename),
shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
pipe = process.stdout
try:
for line in pipe:
match = OBJDUMP_SECTION_HEADER_RE.match(line)
if match and match.group(1) == 'dynsym': return True
finally:
pipe.close()
assert process.wait() == 0, "Failed to objdump -h %s" % filename
return False
def Load(self, mmap_info, code_map, options):
# Skip kernel mmaps when requested using the fact that their tid
# is 0.
if mmap_info.tid == 0 and not options.kernel:
return True
if OBJDUMP_SKIP_RE.match(mmap_info.filename):
return True
if PERF_KERNEL_ALLSYMS_RE.match(mmap_info.filename):
return self._LoadKernelSymbols(code_map)
self.infos.append(mmap_info)
mmap_info.ticks = 0
mmap_info.unique_name = self._UniqueMmapName(mmap_info)
if not os.path.exists(mmap_info.filename):
return True
# Request section headers (-h), symbols (-t), and dynamic symbols
# (-T) from objdump.
# Unfortunately, section headers span two lines, so we have to
# keep the just seen section name (from the first line in each
# section header) in the after_section variable.
if self.HasDynamicSymbols(mmap_info.filename):
dynamic_symbols = "-T"
else:
dynamic_symbols = ""
process = subprocess.Popen(
"%s -h -t %s -C %s" % (OBJDUMP_BIN, dynamic_symbols, mmap_info.filename),
shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
pipe = process.stdout
after_section = None
code_sections = set()
reloc_sections = set()
dynamic = False
try:
for line in pipe:
if after_section:
if line.find("CODE") != -1:
code_sections.add(after_section)
if line.find("RELOC") != -1:
reloc_sections.add(after_section)
after_section = None
continue
match = OBJDUMP_SECTION_HEADER_RE.match(line)
if match:
after_section = match.group(1)
continue
if OBJDUMP_DYNAMIC_SYMBOLS_START_RE.match(line):
dynamic = True
continue
match = OBJDUMP_SYMBOL_LINE_RE.match(line)
if match:
start_address = int(match.group(1), 16)
origin_offset = start_address
flags = match.group(2)
section = match.group(3)
if section in code_sections:
if dynamic or section in reloc_sections:
start_address += mmap_info.addr
size = int(match.group(4), 16)
name = match.group(5)
origin = mmap_info.filename
code_map.Add(Code(name, start_address, start_address + size,
origin, origin_offset))
finally:
pipe.close()
assert process.wait() == 0, "Failed to objdump %s" % mmap_info.filename
def Tick(self, pc):
for i, mmap_info in enumerate(self.infos):
if mmap_info.addr <= pc < (mmap_info.addr + mmap_info.len):
mmap_info.ticks += 1
self.infos[0], self.infos[i] = mmap_info, self.infos[0]
return True
return False
def _UniqueMmapName(self, mmap_info):
name = mmap_info.filename
index = 1
while name in self.names:
name = "%s-%d" % (mmap_info.filename, index)
index += 1
self.names.add(name)
return name
def _LoadKernelSymbols(self, code_map):
if not os.path.exists(KERNEL_ALLSYMS_FILE):
print("Warning: %s not found" % KERNEL_ALLSYMS_FILE, file=sys.stderr)
return False
kallsyms = open(KERNEL_ALLSYMS_FILE, "r")
code = None
for line in kallsyms:
match = KERNEL_ALLSYMS_LINE_RE.match(line)
if match:
start_address = int(match.group(1), 16)
end_address = start_address
name = match.group(2)
if code:
code.end_address = start_address
code_map.Add(code, 16)
code = Code(name, start_address, end_address, "kernel", 0)
return True
def PrintReport(code_map, library_repo, arch, ticks, options):
print("Ticks per symbol:")
used_code = [code for code in code_map.UsedCode()]
used_code.sort(key=lambda x: x.self_ticks, reverse=True)
for i, code in enumerate(used_code):
code_ticks = code.self_ticks
print("%10d %5.1f%% %s [%s]" % (code_ticks, 100. * code_ticks / ticks,
code.FullName(), code.origin))
if options.disasm_all or i < options.disasm_top:
code.PrintAnnotated(arch, options)
print()
print("Ticks per library:")
mmap_infos = [m for m in library_repo.infos if m.ticks > 0]
mmap_infos.sort(key=lambda m: m.ticks, reverse=True)
for mmap_info in mmap_infos:
mmap_ticks = mmap_info.ticks
print("%10d %5.1f%% %s" % (mmap_ticks, 100. * mmap_ticks / ticks,
mmap_info.unique_name))
def PrintDot(code_map, options):
print("digraph G {")
for code in code_map.UsedCode():
if code.self_ticks < 10:
continue
print("n%d [shape=box,label=\"%s\"];" % (code.id, code.name))
if code.callee_ticks:
for callee, ticks in code.callee_ticks.iteritems():
print("n%d -> n%d [label=\"%d\"];" % (code.id, callee.id, ticks))
print("}")
if __name__ == "__main__":
parser = optparse.OptionParser(USAGE)
parser.add_option("--log",
default="v8.log",
help="V8 log file name [default: %default]")
parser.add_option("--trace",
default="perf.data",
help="perf trace file name [default: %default]")
parser.add_option("--kernel",
default=False,
action="store_true",
help="process kernel entries [default: %default]")
parser.add_option("--disasm-top",
default=0,
type="int",
help=("number of top symbols to disassemble and annotate "
"[default: %default]"))
parser.add_option("--disasm-all",
default=False,
action="store_true",
help=("disassemble and annotate all used symbols "
"[default: %default]"))
parser.add_option("--dot",
default=False,
action="store_true",
help="produce dot output (WIP) [default: %default]")
parser.add_option("--quiet", "-q",
default=False,
action="store_true",
help="no auxiliary messages [default: %default]")
parser.add_option("--gc-fake-mmap",
default="/tmp/__v8_gc__",
help="gc fake mmap file [default: %default]")
parser.add_option("--objdump",
default="/usr/bin/objdump",
help="objdump tool to use [default: %default]")
parser.add_option("--host-root",
default="",
help="Path to the host root [default: %default]")
options, args = parser.parse_args()
if not options.quiet:
print("V8 log: %s, %s.ll" % (options.log, options.log))
print("Perf trace file: %s" % options.trace)
V8_GC_FAKE_MMAP = options.gc_fake_mmap
HOST_ROOT = options.host_root
if os.path.exists(options.objdump):
disasm.OBJDUMP_BIN = options.objdump
OBJDUMP_BIN = options.objdump
else:
print("Cannot find %s, falling back to default objdump" % options.objdump)
# Stats.
events = 0
ticks = 0
missed_ticks = 0
really_missed_ticks = 0
optimized_ticks = 0
generated_ticks = 0
v8_internal_ticks = 0
mmap_time = 0
sample_time = 0
# Initialize the log reader.
code_map = CodeMap()
log_reader = LogReader(log_name=options.log + ".ll",
code_map=code_map)
if not options.quiet:
print("Generated code architecture: %s" % log_reader.arch)
print()
sys.stdout.flush()
# Process the code and trace logs.
library_repo = LibraryRepo()
log_reader.ReadUpToGC()
trace_reader = TraceReader(options.trace)
while True:
header, offset = trace_reader.ReadEventHeader()
if not header:
break
events += 1
if header.type == PERF_RECORD_MMAP:
start = time.time()
mmap_info = trace_reader.ReadMmap(header, offset)
if mmap_info.filename == HOST_ROOT + V8_GC_FAKE_MMAP:
log_reader.ReadUpToGC()
else:
library_repo.Load(mmap_info, code_map, options)
mmap_time += time.time() - start
elif header.type == PERF_RECORD_MMAP2:
start = time.time()
mmap_info = trace_reader.ReadMmap2(header, offset)
if mmap_info.filename == HOST_ROOT + V8_GC_FAKE_MMAP:
log_reader.ReadUpToGC()
else:
library_repo.Load(mmap_info, code_map, options)
mmap_time += time.time() - start
elif header.type == PERF_RECORD_SAMPLE:
ticks += 1
start = time.time()
sample = trace_reader.ReadSample(header, offset)
code = code_map.Find(sample.ip)
if code:
code.Tick(sample.ip)
if code.codetype == Code.OPTIMIZED:
optimized_ticks += 1
elif code.codetype == Code.FULL_CODEGEN:
generated_ticks += 1
elif code.codetype == Code.V8INTERNAL:
v8_internal_ticks += 1
else:
missed_ticks += 1
if not library_repo.Tick(sample.ip) and not code:
really_missed_ticks += 1
if trace_reader.callchain_supported:
for ip in sample.ips:
caller_code = code_map.Find(ip)
if caller_code:
if code:
caller_code.CalleeTick(code)
code = caller_code
sample_time += time.time() - start
if options.dot:
PrintDot(code_map, options)
else:
PrintReport(code_map, library_repo, log_reader.arch, ticks, options)
if not options.quiet:
def PrintTicks(number, total, description):
print("%10d %5.1f%% ticks in %s" %
(number, 100.0*number/total, description))
print()
print("Stats:")
print("%10d total trace events" % events)
print("%10d total ticks" % ticks)
print("%10d ticks not in symbols" % missed_ticks)
unaccounted = "unaccounted ticks"
if really_missed_ticks > 0:
unaccounted += " (probably in the kernel, try --kernel)"
PrintTicks(really_missed_ticks, ticks, unaccounted)
PrintTicks(optimized_ticks, ticks, "ticks in optimized code")
PrintTicks(generated_ticks, ticks, "ticks in other lazily compiled code")
PrintTicks(v8_internal_ticks, ticks, "ticks in v8::internal::*")
print("%10d total symbols" % len([c for c in code_map.AllCode()]))
print("%10d used symbols" % len([c for c in code_map.UsedCode()]))
print("%9.2fs library processing time" % mmap_time)
print("%9.2fs tick processing time" % sample_time)
log_reader.Dispose()
trace_reader.Dispose()
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