3 # Copyright 2012 the V8 project authors. All rights reserved.
4 # Redistribution and use in source and binary forms, with or without
5 # modification, are permitted provided that the following conditions are
8 # * Redistributions of source code must retain the above copyright
9 # notice, this list of conditions and the following disclaimer.
10 # * Redistributions in binary form must reproduce the above
11 # copyright notice, this list of conditions and the following
12 # disclaimer in the documentation and/or other materials provided
13 # with the distribution.
14 # * Neither the name of Google Inc. nor the names of its
15 # contributors may be used to endorse or promote products derived
16 # from this software without specific prior written permission.
18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 USAGE="""usage: %prog [OPTION]...
45 Analyses V8 and perf logs to produce profiles.
47 Perf logs can be collected using a command like:
48 $ perf record -R -e cycles -c 10000 -f -i ./d8 bench.js --ll-prof
49 # -R: collect all data
50 # -e cycles: use cpu-cycles event (run "perf list" for details)
51 # -c 10000: write a sample after each 10000 events
52 # -f: force output file overwrite
53 # -i: limit profiling to our process and the kernel
54 # --ll-prof shell flag enables the right V8 logs
55 This will produce a binary trace file (perf.data) that %prog can analyse.
58 The kernel has an internal maximum for events per second, it is 100K by
59 default. That's not enough for "-c 10000". Set it to some higher value:
60 $ echo 10000000 | sudo tee /proc/sys/kernel/perf_event_max_sample_rate
61 You can also make the warning about kernel address maps go away:
62 $ echo 0 | sudo tee /proc/sys/kernel/kptr_restrict
64 We have a convenience script that handles all of the above for you:
65 $ tools/run-llprof.sh ./d8 bench.js
68 # Print flat profile with annotated disassembly for the 10 top
69 # symbols. Use default log names and include the snapshot log.
70 $ %prog --snapshot --disasm-top=10
72 # Print flat profile with annotated disassembly for all used symbols.
73 # Use default log names and include kernel symbols into analysis.
74 $ %prog --disasm-all --kernel
76 # Print flat profile. Use custom log names.
77 $ %prog --log=foo.log --snapshot-log=snap-foo.log --trace=foo.data --snapshot
82 JS_SNAPSHOT_ORIGIN = "js-snapshot"
93 def __init__(self, name, start_address, end_address, origin, origin_offset):
97 self.other_names = None
98 self.start_address = start_address
99 self.end_address = end_address
101 self.origin_offset = origin_offset
103 self.self_ticks_map = None
104 self.callee_ticks = None
105 if name.startswith("LazyCompile:*"):
106 self.codetype = Code.OPTIMIZED
107 elif name.startswith("LazyCompile:"):
108 self.codetype = Code.FULL_CODEGEN
109 elif name.startswith("v8::internal::"):
110 self.codetype = Code.V8INTERNAL
112 self.codetype = Code.UNKNOWN
114 def AddName(self, name):
115 assert self.name != name
116 if self.other_names is None:
117 self.other_names = [name]
119 if not name in self.other_names:
120 self.other_names.append(name)
123 if self.other_names is None:
125 self.other_names.sort()
126 return "%s (aka %s)" % (self.name, ", ".join(self.other_names))
129 return self.self_ticks > 0 or self.callee_ticks is not None
133 if self.self_ticks_map is None:
134 self.self_ticks_map = collections.defaultdict(lambda: 0)
135 offset = pc - self.start_address
136 self.self_ticks_map[offset] += 1
138 def CalleeTick(self, callee):
139 if self.callee_ticks is None:
140 self.callee_ticks = collections.defaultdict(lambda: 0)
141 self.callee_ticks[callee] += 1
143 def PrintAnnotated(self, arch, options):
144 if self.self_ticks_map is None:
147 ticks_map = self.self_ticks_map.items()
148 # Convert the ticks map to offsets and counts arrays so that later
149 # we can do binary search in the offsets array.
150 ticks_map.sort(key=lambda t: t[0])
151 ticks_offsets = [t[0] for t in ticks_map]
152 ticks_counts = [t[1] for t in ticks_map]
153 # Get a list of disassembled lines and their addresses.
154 lines = self._GetDisasmLines(arch, options)
157 # Print annotated lines.
158 address = lines[0][0]
160 for i in xrange(len(lines)):
161 start_offset = lines[i][0] - address
162 if i == len(lines) - 1:
163 end_offset = self.end_address - self.start_address
165 end_offset = lines[i + 1][0] - address
166 # Ticks (reported pc values) are not always precise, i.e. not
167 # necessarily point at instruction starts. So we have to search
168 # for ticks that touch the current instruction line.
169 j = bisect.bisect_left(ticks_offsets, end_offset)
171 for offset, cnt in reversed(zip(ticks_offsets[:j], ticks_counts[:j])):
172 if offset < start_offset:
176 count = 100.0 * count / self.self_ticks
178 print "%15.2f %x: %s" % (count, lines[i][0], lines[i][1])
180 print "%s %x: %s" % (" " * 15, lines[i][0], lines[i][1])
182 assert total_count == self.self_ticks, \
183 "Lost ticks (%d != %d) in %s" % (total_count, self.self_ticks, self)
186 return "%s [0x%x, 0x%x) size: %d origin: %s" % (
190 self.end_address - self.start_address,
193 def _GetDisasmLines(self, arch, options):
194 if self.origin == JS_ORIGIN or self.origin == JS_SNAPSHOT_ORIGIN:
196 filename = options.log + ".ll"
199 filename = self.origin
200 return disasm.GetDisasmLines(filename,
202 self.end_address - self.start_address,
207 class CodePage(object):
208 """Group of adjacent code objects."""
210 SHIFT = 20 # 1M pages
215 def PageAddress(address):
216 return address & CodePage.MASK
220 return address >> CodePage.SHIFT
223 def PageAddressFromId(id):
224 return id << CodePage.SHIFT
226 def __init__(self, address):
227 self.address = address
228 self.code_objects = []
231 self.code_objects.append(code)
233 def Remove(self, code):
234 self.code_objects.remove(code)
237 code_objects = self.code_objects
238 for i, code in enumerate(code_objects):
239 if code.start_address <= pc < code.end_address:
240 code_objects[0], code_objects[i] = code, code_objects[0]
245 return self.code_objects.__iter__()
248 class CodeMap(object):
249 """Code object map."""
253 self.min_address = 1 << 64
254 self.max_address = -1
256 def Add(self, code, max_pages=-1):
257 page_id = CodePage.PageId(code.start_address)
258 limit_id = CodePage.PageId(code.end_address + CodePage.SIZE - 1)
260 while page_id < limit_id:
261 if max_pages >= 0 and pages > max_pages:
262 print >>sys.stderr, \
263 "Warning: page limit (%d) reached for %s [%s]" % (
264 max_pages, code.name, code.origin)
266 if page_id in self.pages:
267 page = self.pages[page_id]
269 page = CodePage(CodePage.PageAddressFromId(page_id))
270 self.pages[page_id] = page
274 self.min_address = min(self.min_address, code.start_address)
275 self.max_address = max(self.max_address, code.end_address)
277 def Remove(self, code):
278 page_id = CodePage.PageId(code.start_address)
279 limit_id = CodePage.PageId(code.end_address + CodePage.SIZE - 1)
281 while page_id < limit_id:
282 if page_id not in self.pages:
285 page = self.pages[page_id]
292 for page in self.pages.itervalues():
294 if CodePage.PageAddress(code.start_address) == page.address:
298 for code in self.AllCode():
303 for code in self.AllCode():
307 if pc < self.min_address or pc >= self.max_address:
309 page_id = CodePage.PageId(pc)
310 if page_id not in self.pages:
312 return self.pages[page_id].Find(pc)
315 class CodeInfo(object):
316 """Generic info about generated code objects."""
318 def __init__(self, arch, header_size):
320 self.header_size = header_size
323 class SnapshotLogReader(object):
324 """V8 snapshot log reader."""
326 _SNAPSHOT_CODE_NAME_RE = re.compile(
327 r"snapshot-code-name,(\d+),\"(.*)\"")
329 def __init__(self, log_name):
330 self.log_name = log_name
332 def ReadNameMap(self):
333 log = open(self.log_name, "r")
335 snapshot_pos_to_name = {}
337 match = SnapshotLogReader._SNAPSHOT_CODE_NAME_RE.match(line)
339 pos = int(match.group(1))
340 name = match.group(2)
341 snapshot_pos_to_name[pos] = name
344 return snapshot_pos_to_name
347 class LogReader(object):
348 """V8 low-level (binary) log reader."""
350 _ARCH_TO_POINTER_TYPE_MAP = {
351 "ia32": ctypes.c_uint32,
352 "arm": ctypes.c_uint32,
353 "mips": ctypes.c_uint32,
354 "x64": ctypes.c_uint64
357 _CODE_CREATE_TAG = "C"
359 _CODE_DELETE_TAG = "D"
360 _SNAPSHOT_POSITION_TAG = "P"
361 _CODE_MOVING_GC_TAG = "G"
363 def __init__(self, log_name, code_map, snapshot_pos_to_name):
364 self.log_file = open(log_name, "r")
365 self.log = mmap.mmap(self.log_file.fileno(), 0, mmap.MAP_PRIVATE)
367 self.code_map = code_map
368 self.snapshot_pos_to_name = snapshot_pos_to_name
369 self.address_to_snapshot_name = {}
371 self.arch = self.log[:self.log.find("\0")]
372 self.log_pos += len(self.arch) + 1
373 assert self.arch in LogReader._ARCH_TO_POINTER_TYPE_MAP, \
374 "Unsupported architecture %s" % self.arch
375 pointer_type = LogReader._ARCH_TO_POINTER_TYPE_MAP[self.arch]
377 self.code_create_struct = LogReader._DefineStruct([
378 ("name_size", ctypes.c_int32),
379 ("code_address", pointer_type),
380 ("code_size", ctypes.c_int32)])
382 self.code_move_struct = LogReader._DefineStruct([
383 ("from_address", pointer_type),
384 ("to_address", pointer_type)])
386 self.code_delete_struct = LogReader._DefineStruct([
387 ("address", pointer_type)])
389 self.snapshot_position_struct = LogReader._DefineStruct([
390 ("address", pointer_type),
391 ("position", ctypes.c_int32)])
393 def ReadUpToGC(self):
394 while self.log_pos < self.log.size():
395 tag = self.log[self.log_pos]
398 if tag == LogReader._CODE_MOVING_GC_TAG:
399 self.address_to_snapshot_name.clear()
402 if tag == LogReader._CODE_CREATE_TAG:
403 event = self.code_create_struct.from_buffer(self.log, self.log_pos)
404 self.log_pos += ctypes.sizeof(event)
405 start_address = event.code_address
406 end_address = start_address + event.code_size
407 if start_address in self.address_to_snapshot_name:
408 name = self.address_to_snapshot_name[start_address]
409 origin = JS_SNAPSHOT_ORIGIN
411 name = self.log[self.log_pos:self.log_pos + event.name_size]
413 self.log_pos += event.name_size
414 origin_offset = self.log_pos
415 self.log_pos += event.code_size
416 code = Code(name, start_address, end_address, origin, origin_offset)
417 conficting_code = self.code_map.Find(start_address)
419 if not (conficting_code.start_address == code.start_address and
420 conficting_code.end_address == code.end_address):
421 self.code_map.Remove(conficting_code)
423 LogReader._HandleCodeConflict(conficting_code, code)
424 # TODO(vitalyr): this warning is too noisy because of our
425 # attempts to reconstruct code log from the snapshot.
426 # print >>sys.stderr, \
427 # "Warning: Skipping duplicate code log entry %s" % code
429 self.code_map.Add(code)
432 if tag == LogReader._CODE_MOVE_TAG:
433 event = self.code_move_struct.from_buffer(self.log, self.log_pos)
434 self.log_pos += ctypes.sizeof(event)
435 old_start_address = event.from_address
436 new_start_address = event.to_address
437 if old_start_address == new_start_address:
438 # Skip useless code move entries.
440 code = self.code_map.Find(old_start_address)
442 print >>sys.stderr, "Warning: Not found %x" % old_start_address
444 assert code.start_address == old_start_address, \
445 "Inexact move address %x for %s" % (old_start_address, code)
446 self.code_map.Remove(code)
447 size = code.end_address - code.start_address
448 code.start_address = new_start_address
449 code.end_address = new_start_address + size
450 self.code_map.Add(code)
453 if tag == LogReader._CODE_DELETE_TAG:
454 event = self.code_delete_struct.from_buffer(self.log, self.log_pos)
455 self.log_pos += ctypes.sizeof(event)
456 old_start_address = event.address
457 code = self.code_map.Find(old_start_address)
459 print >>sys.stderr, "Warning: Not found %x" % old_start_address
461 assert code.start_address == old_start_address, \
462 "Inexact delete address %x for %s" % (old_start_address, code)
463 self.code_map.Remove(code)
466 if tag == LogReader._SNAPSHOT_POSITION_TAG:
467 event = self.snapshot_position_struct.from_buffer(self.log,
469 self.log_pos += ctypes.sizeof(event)
470 start_address = event.address
471 snapshot_pos = event.position
472 if snapshot_pos in self.snapshot_pos_to_name:
473 self.address_to_snapshot_name[start_address] = \
474 self.snapshot_pos_to_name[snapshot_pos]
477 assert False, "Unknown tag %s" % tag
481 self.log_file.close()
484 def _DefineStruct(fields):
485 class Struct(ctypes.Structure):
490 def _HandleCodeConflict(old_code, new_code):
491 assert (old_code.start_address == new_code.start_address and
492 old_code.end_address == new_code.end_address), \
493 "Conficting code log entries %s and %s" % (old_code, new_code)
494 if old_code.name == new_code.name:
496 # Code object may be shared by a few functions. Collect the full
498 old_code.AddName(new_code.name)
501 class Descriptor(object):
502 """Descriptor of a structure in the binary trace log."""
505 "u16": ctypes.c_uint16,
506 "u32": ctypes.c_uint32,
507 "u64": ctypes.c_uint64
510 def __init__(self, fields):
511 class TraceItem(ctypes.Structure):
512 _fields_ = Descriptor.CtypesFields(fields)
515 return ", ".join("%s: %s" % (field, self.__getattribute__(field))
516 for field, _ in TraceItem._fields_)
518 self.ctype = TraceItem
520 def Read(self, trace, offset):
521 return self.ctype.from_buffer(trace, offset)
524 def CtypesFields(fields):
525 return [(field, Descriptor.CTYPE_MAP[format]) for (field, format) in fields]
528 # Please see http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=tree;f=tools/perf
529 # for the gory details.
532 # Reference: struct perf_file_header in kernel/tools/perf/util/header.h
533 TRACE_HEADER_DESC = Descriptor([
536 ("attr_size", "u64"),
537 ("attrs_offset", "u64"),
538 ("attrs_size", "u64"),
539 ("data_offset", "u64"),
540 ("data_size", "u64"),
541 ("event_types_offset", "u64"),
542 ("event_types_size", "u64")
546 # Reference: /usr/include/linux/perf_event.h
547 PERF_EVENT_ATTR_DESC = Descriptor([
551 ("sample_period_or_freq", "u64"),
552 ("sample_type", "u64"),
553 ("read_format", "u64"),
555 ("wakeup_events_or_watermark", "u32"),
562 # Reference: /usr/include/linux/perf_event.h
563 PERF_EVENT_HEADER_DESC = Descriptor([
570 # Reference: kernel/events/core.c
571 PERF_MMAP_EVENT_BODY_DESC = Descriptor([
580 # perf_event_attr.sample_type bits control the set of
581 # perf_sample_event fields.
582 PERF_SAMPLE_IP = 1 << 0
583 PERF_SAMPLE_TID = 1 << 1
584 PERF_SAMPLE_TIME = 1 << 2
585 PERF_SAMPLE_ADDR = 1 << 3
586 PERF_SAMPLE_READ = 1 << 4
587 PERF_SAMPLE_CALLCHAIN = 1 << 5
588 PERF_SAMPLE_ID = 1 << 6
589 PERF_SAMPLE_CPU = 1 << 7
590 PERF_SAMPLE_PERIOD = 1 << 8
591 PERF_SAMPLE_STREAM_ID = 1 << 9
592 PERF_SAMPLE_RAW = 1 << 10
595 # Reference: /usr/include/perf_event.h, the comment for PERF_RECORD_SAMPLE.
596 PERF_SAMPLE_EVENT_BODY_FIELDS = [
597 ("ip", "u64", PERF_SAMPLE_IP),
598 ("pid", "u32", PERF_SAMPLE_TID),
599 ("tid", "u32", PERF_SAMPLE_TID),
600 ("time", "u64", PERF_SAMPLE_TIME),
601 ("addr", "u64", PERF_SAMPLE_ADDR),
602 ("id", "u64", PERF_SAMPLE_ID),
603 ("stream_id", "u64", PERF_SAMPLE_STREAM_ID),
604 ("cpu", "u32", PERF_SAMPLE_CPU),
605 ("res", "u32", PERF_SAMPLE_CPU),
606 ("period", "u64", PERF_SAMPLE_PERIOD),
607 # Don't want to handle read format that comes after the period and
608 # before the callchain and has variable size.
609 ("nr", "u64", PERF_SAMPLE_CALLCHAIN)
610 # Raw data follows the callchain and is ignored.
614 PERF_SAMPLE_EVENT_IP_FORMAT = "u64"
618 PERF_RECORD_SAMPLE = 9
621 class TraceReader(object):
622 """Perf (linux-2.6/tools/perf) trace file reader."""
624 _TRACE_HEADER_MAGIC = 4993446653023372624
626 def __init__(self, trace_name):
627 self.trace_file = open(trace_name, "r")
628 self.trace = mmap.mmap(self.trace_file.fileno(), 0, mmap.MAP_PRIVATE)
629 self.trace_header = TRACE_HEADER_DESC.Read(self.trace, 0)
630 if self.trace_header.magic != TraceReader._TRACE_HEADER_MAGIC:
631 print >>sys.stderr, "Warning: unsupported trace header magic"
632 self.offset = self.trace_header.data_offset
633 self.limit = self.trace_header.data_offset + self.trace_header.data_size
634 assert self.limit <= self.trace.size(), \
635 "Trace data limit exceeds trace file size"
636 self.header_size = ctypes.sizeof(PERF_EVENT_HEADER_DESC.ctype)
637 assert self.trace_header.attrs_size != 0, \
638 "No perf event attributes found in the trace"
639 perf_event_attr = PERF_EVENT_ATTR_DESC.Read(self.trace,
640 self.trace_header.attrs_offset)
641 self.sample_event_body_desc = self._SampleEventBodyDesc(
642 perf_event_attr.sample_type)
643 self.callchain_supported = \
644 (perf_event_attr.sample_type & PERF_SAMPLE_CALLCHAIN) != 0
645 if self.callchain_supported:
646 self.ip_struct = Descriptor.CTYPE_MAP[PERF_SAMPLE_EVENT_IP_FORMAT]
647 self.ip_size = ctypes.sizeof(self.ip_struct)
649 def ReadEventHeader(self):
650 if self.offset >= self.limit:
653 header = PERF_EVENT_HEADER_DESC.Read(self.trace, self.offset)
654 self.offset += header.size
655 return header, offset
657 def ReadMmap(self, header, offset):
658 mmap_info = PERF_MMAP_EVENT_BODY_DESC.Read(self.trace,
659 offset + self.header_size)
660 # Read null-terminated filename.
661 filename = self.trace[offset + self.header_size + ctypes.sizeof(mmap_info):
662 offset + header.size]
663 mmap_info.filename = HOST_ROOT + filename[:filename.find(chr(0))]
666 def ReadSample(self, header, offset):
667 sample = self.sample_event_body_desc.Read(self.trace,
668 offset + self.header_size)
669 if not self.callchain_supported:
672 offset += self.header_size + ctypes.sizeof(sample)
673 for _ in xrange(sample.nr):
675 self.ip_struct.from_buffer(self.trace, offset).value)
676 offset += self.ip_size
681 self.trace_file.close()
683 def _SampleEventBodyDesc(self, sample_type):
684 assert (sample_type & PERF_SAMPLE_READ) == 0, \
685 "Can't hande read format in samples"
686 fields = [(field, format)
687 for (field, format, bit) in PERF_SAMPLE_EVENT_BODY_FIELDS
688 if (bit & sample_type) != 0]
689 return Descriptor(fields)
692 OBJDUMP_SECTION_HEADER_RE = re.compile(
693 r"^\s*\d+\s(\.\S+)\s+[a-f0-9]")
694 OBJDUMP_SYMBOL_LINE_RE = re.compile(
695 r"^([a-f0-9]+)\s(.{7})\s(\S+)\s+([a-f0-9]+)\s+(?:\.hidden\s+)?(.*)$")
696 OBJDUMP_DYNAMIC_SYMBOLS_START_RE = re.compile(
697 r"^DYNAMIC SYMBOL TABLE")
698 OBJDUMP_SKIP_RE = re.compile(
699 r"^.*ld\.so\.cache$")
700 KERNEL_ALLSYMS_FILE = "/proc/kallsyms"
701 PERF_KERNEL_ALLSYMS_RE = re.compile(
703 KERNEL_ALLSYMS_LINE_RE = re.compile(
704 r"^([a-f0-9]+)\s(?:t|T)\s(\S+)$")
707 class LibraryRepo(object):
713 def Load(self, mmap_info, code_map, options):
714 # Skip kernel mmaps when requested using the fact that their tid
716 if mmap_info.tid == 0 and not options.kernel:
718 if OBJDUMP_SKIP_RE.match(mmap_info.filename):
720 if PERF_KERNEL_ALLSYMS_RE.match(mmap_info.filename):
721 return self._LoadKernelSymbols(code_map)
722 self.infos.append(mmap_info)
724 mmap_info.unique_name = self._UniqueMmapName(mmap_info)
725 if not os.path.exists(mmap_info.filename):
727 # Request section headers (-h), symbols (-t), and dynamic symbols
729 # Unfortunately, section headers span two lines, so we have to
730 # keep the just seen section name (from the first line in each
731 # section header) in the after_section variable.
732 if mmap_info.filename.endswith(".ko"):
735 dynamic_symbols = "-T"
736 process = subprocess.Popen(
737 "%s -h -t %s -C %s" % (OBJDUMP_BIN, dynamic_symbols, mmap_info.filename),
738 shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
739 pipe = process.stdout
741 code_sections = set()
742 reloc_sections = set()
747 if line.find("CODE") != -1:
748 code_sections.add(after_section)
749 if line.find("RELOC") != -1:
750 reloc_sections.add(after_section)
754 match = OBJDUMP_SECTION_HEADER_RE.match(line)
756 after_section = match.group(1)
759 if OBJDUMP_DYNAMIC_SYMBOLS_START_RE.match(line):
763 match = OBJDUMP_SYMBOL_LINE_RE.match(line)
765 start_address = int(match.group(1), 16)
766 origin_offset = start_address
767 flags = match.group(2)
768 section = match.group(3)
769 if section in code_sections:
770 if dynamic or section in reloc_sections:
771 start_address += mmap_info.addr
772 size = int(match.group(4), 16)
773 name = match.group(5)
774 origin = mmap_info.filename
775 code_map.Add(Code(name, start_address, start_address + size,
776 origin, origin_offset))
779 assert process.wait() == 0, "Failed to objdump %s" % mmap_info.filename
782 for i, mmap_info in enumerate(self.infos):
783 if mmap_info.addr <= pc < (mmap_info.addr + mmap_info.len):
785 self.infos[0], self.infos[i] = mmap_info, self.infos[0]
789 def _UniqueMmapName(self, mmap_info):
790 name = mmap_info.filename
792 while name in self.names:
793 name = "%s-%d" % (mmap_info.filename, index)
798 def _LoadKernelSymbols(self, code_map):
799 if not os.path.exists(KERNEL_ALLSYMS_FILE):
800 print >>sys.stderr, "Warning: %s not found" % KERNEL_ALLSYMS_FILE
802 kallsyms = open(KERNEL_ALLSYMS_FILE, "r")
804 for line in kallsyms:
805 match = KERNEL_ALLSYMS_LINE_RE.match(line)
807 start_address = int(match.group(1), 16)
808 end_address = start_address
809 name = match.group(2)
811 code.end_address = start_address
812 code_map.Add(code, 16)
813 code = Code(name, start_address, end_address, "kernel", 0)
817 def PrintReport(code_map, library_repo, arch, ticks, options):
818 print "Ticks per symbol:"
819 used_code = [code for code in code_map.UsedCode()]
820 used_code.sort(key=lambda x: x.self_ticks, reverse=True)
821 for i, code in enumerate(used_code):
822 code_ticks = code.self_ticks
823 print "%10d %5.1f%% %s [%s]" % (code_ticks, 100. * code_ticks / ticks,
824 code.FullName(), code.origin)
825 if options.disasm_all or i < options.disasm_top:
826 code.PrintAnnotated(arch, options)
828 print "Ticks per library:"
829 mmap_infos = [m for m in library_repo.infos if m.ticks > 0]
830 mmap_infos.sort(key=lambda m: m.ticks, reverse=True)
831 for mmap_info in mmap_infos:
832 mmap_ticks = mmap_info.ticks
833 print "%10d %5.1f%% %s" % (mmap_ticks, 100. * mmap_ticks / ticks,
834 mmap_info.unique_name)
837 def PrintDot(code_map, options):
839 for code in code_map.UsedCode():
840 if code.self_ticks < 10:
842 print "n%d [shape=box,label=\"%s\"];" % (code.id, code.name)
843 if code.callee_ticks:
844 for callee, ticks in code.callee_ticks.iteritems():
845 print "n%d -> n%d [label=\"%d\"];" % (code.id, callee.id, ticks)
849 if __name__ == "__main__":
850 parser = optparse.OptionParser(USAGE)
851 parser.add_option("--snapshot-log",
852 default="obj/release/snapshot.log",
853 help="V8 snapshot log file name [default: %default]")
854 parser.add_option("--log",
856 help="V8 log file name [default: %default]")
857 parser.add_option("--snapshot",
860 help="process V8 snapshot log [default: %default]")
861 parser.add_option("--trace",
863 help="perf trace file name [default: %default]")
864 parser.add_option("--kernel",
867 help="process kernel entries [default: %default]")
868 parser.add_option("--disasm-top",
871 help=("number of top symbols to disassemble and annotate "
872 "[default: %default]"))
873 parser.add_option("--disasm-all",
876 help=("disassemble and annotate all used symbols "
877 "[default: %default]"))
878 parser.add_option("--dot",
881 help="produce dot output (WIP) [default: %default]")
882 parser.add_option("--quiet", "-q",
885 help="no auxiliary messages [default: %default]")
886 parser.add_option("--gc-fake-mmap",
887 default="/tmp/__v8_gc__",
888 help="gc fake mmap file [default: %default]")
889 parser.add_option("--objdump",
890 default="/usr/bin/objdump",
891 help="objdump tool to use [default: %default]")
892 parser.add_option("--host-root",
894 help="Path to the host root [default: %default]")
895 options, args = parser.parse_args()
897 if not options.quiet:
899 print "V8 logs: %s, %s, %s.ll" % (options.snapshot_log,
903 print "V8 log: %s, %s.ll (no snapshot)" % (options.log, options.log)
904 print "Perf trace file: %s" % options.trace
906 V8_GC_FAKE_MMAP = options.gc_fake_mmap
907 HOST_ROOT = options.host_root
908 if os.path.exists(options.objdump):
909 disasm.OBJDUMP_BIN = options.objdump
910 OBJDUMP_BIN = options.objdump
912 print "Cannot find %s, falling back to default objdump" % options.objdump
918 really_missed_ticks = 0
921 v8_internal_ticks = 0
925 # Process the snapshot log to fill the snapshot name map.
926 snapshot_name_map = {}
928 snapshot_log_reader = SnapshotLogReader(log_name=options.snapshot_log)
929 snapshot_name_map = snapshot_log_reader.ReadNameMap()
931 # Initialize the log reader.
933 log_reader = LogReader(log_name=options.log + ".ll",
935 snapshot_pos_to_name=snapshot_name_map)
936 if not options.quiet:
937 print "Generated code architecture: %s" % log_reader.arch
941 # Process the code and trace logs.
942 library_repo = LibraryRepo()
943 log_reader.ReadUpToGC()
944 trace_reader = TraceReader(options.trace)
946 header, offset = trace_reader.ReadEventHeader()
950 if header.type == PERF_RECORD_MMAP:
952 mmap_info = trace_reader.ReadMmap(header, offset)
953 if mmap_info.filename == HOST_ROOT + V8_GC_FAKE_MMAP:
954 log_reader.ReadUpToGC()
956 library_repo.Load(mmap_info, code_map, options)
957 mmap_time += time.time() - start
958 elif header.type == PERF_RECORD_SAMPLE:
961 sample = trace_reader.ReadSample(header, offset)
962 code = code_map.Find(sample.ip)
965 if code.codetype == Code.OPTIMIZED:
967 elif code.codetype == Code.FULL_CODEGEN:
969 elif code.codetype == Code.V8INTERNAL:
970 v8_internal_ticks += 1
973 if not library_repo.Tick(sample.ip) and not code:
974 really_missed_ticks += 1
975 if trace_reader.callchain_supported:
976 for ip in sample.ips:
977 caller_code = code_map.Find(ip)
980 caller_code.CalleeTick(code)
982 sample_time += time.time() - start
985 PrintDot(code_map, options)
987 PrintReport(code_map, library_repo, log_reader.arch, ticks, options)
989 if not options.quiet:
990 def PrintTicks(number, total, description):
991 print("%10d %5.1f%% ticks in %s" %
992 (number, 100.0*number/total, description))
995 print "%10d total trace events" % events
996 print "%10d total ticks" % ticks
997 print "%10d ticks not in symbols" % missed_ticks
998 unaccounted = "unaccounted ticks"
999 if really_missed_ticks > 0:
1000 unaccounted += " (probably in the kernel, try --kernel)"
1001 PrintTicks(really_missed_ticks, ticks, unaccounted)
1002 PrintTicks(optimized_ticks, ticks, "ticks in optimized code")
1003 PrintTicks(generated_ticks, ticks, "ticks in other lazily compiled code")
1004 PrintTicks(v8_internal_ticks, ticks, "ticks in v8::internal::*")
1005 print "%10d total symbols" % len([c for c in code_map.AllCode()])
1006 print "%10d used symbols" % len([c for c in code_map.UsedCode()])
1007 print "%9.2fs library processing time" % mmap_time
1008 print "%9.2fs tick processing time" % sample_time
1010 log_reader.Dispose()
1011 trace_reader.Dispose()