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v8/tools/ll_prof.py
rmcilroy cb29f9cdbc [Interpreter] Add support for cpu profiler logging. 
Adds support for cpu profiler logging to the interpreter. Modifies the
the API to be passed AbstractCode objects instead of Code objects, and
adds extra functions to AbstractCode which is required by log.cc and
cpu-profiler.cc.

The main change in sampler.cc is to determine if a stack frame is an
interpreter stack frame, and if so, use the bytecode address as the pc
for that frame. This allows sampling of bytecode functions. This
requires adding support to SafeStackIterator to determine if a frame is
interpreted, which we do by checking the PC against pre-stored addresses
for the start and end of interpreter entry builtins.

Also removes CodeDeleteEvents which are dead code and haven't
been reported for some time.

Still to do is tracking source positions which will be done in a
followup CL.

BUG=v8:4766
LOG=N

Review URL: https://codereview.chromium.org/1728593002

Cr-Commit-Position: refs/heads/master@{#34321}
2016-02-26 11:04:55 +00:00

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#!/usr/bin/env python
#
# 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.
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 and include the snapshot log.
$ %prog --snapshot --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 --snapshot-log=snap-foo.log --trace=foo.data --snapshot
"""
JS_ORIGIN = "js"
JS_SNAPSHOT_ORIGIN = "js-snapshot"
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 xrange(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 or self.origin == JS_SNAPSHOT_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 >>sys.stderr, \
"Warning: page limit (%d) reached for %s [%s]" % (
max_pages, code.name, code.origin)
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 SnapshotLogReader(object):
"""V8 snapshot log reader."""
_SNAPSHOT_CODE_NAME_RE = re.compile(
r"snapshot-code-name,(\d+),\"(.*)\"")
def __init__(self, log_name):
self.log_name = log_name
def ReadNameMap(self):
log = open(self.log_name, "r")
try:
snapshot_pos_to_name = {}
for line in log:
match = SnapshotLogReader._SNAPSHOT_CODE_NAME_RE.match(line)
if match:
pos = int(match.group(1))
name = match.group(2)
snapshot_pos_to_name[pos] = name
finally:
log.close()
return snapshot_pos_to_name
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"
_SNAPSHOT_POSITION_TAG = "P"
_CODE_MOVING_GC_TAG = "G"
def __init__(self, log_name, code_map, snapshot_pos_to_name):
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.snapshot_pos_to_name = snapshot_pos_to_name
self.address_to_snapshot_name = {}
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)])
self.snapshot_position_struct = LogReader._DefineStruct([
("address", pointer_type),
("position", ctypes.c_int32)])
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:
self.address_to_snapshot_name.clear()
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
if start_address in self.address_to_snapshot_name:
name = self.address_to_snapshot_name[start_address]
origin = JS_SNAPSHOT_ORIGIN
else:
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 >>sys.stderr, "Warning: Not found %x" % old_start_address
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
if tag == LogReader._SNAPSHOT_POSITION_TAG:
event = self.snapshot_position_struct.from_buffer(self.log,
self.log_pos)
self.log_pos += ctypes.sizeof(event)
start_address = event.address
snapshot_pos = event.position
if snapshot_pos in self.snapshot_pos_to_name:
self.address_to_snapshot_name[start_address] = \
self.snapshot_pos_to_name[snapshot_pos]
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 >>sys.stderr, "Warning: unsupported trace header magic"
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 xrange(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 >>sys.stderr, "Warning: %s not found" % KERNEL_ALLSYMS_FILE
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("--snapshot-log",
default="obj/release/snapshot.log",
help="V8 snapshot log file name [default: %default]")
parser.add_option("--log",
default="v8.log",
help="V8 log file name [default: %default]")
parser.add_option("--snapshot",
default=False,
action="store_true",
help="process V8 snapshot log [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:
if options.snapshot:
print "V8 logs: %s, %s, %s.ll" % (options.snapshot_log,
options.log,
options.log)
else:
print "V8 log: %s, %s.ll (no snapshot)" % (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
# Process the snapshot log to fill the snapshot name map.
snapshot_name_map = {}
if options.snapshot:
snapshot_log_reader = SnapshotLogReader(log_name=options.snapshot_log)
snapshot_name_map = snapshot_log_reader.ReadNameMap()
# Initialize the log reader.
code_map = CodeMap()
log_reader = LogReader(log_name=options.log + ".ll",
code_map=code_map,
snapshot_pos_to_name=snapshot_name_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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