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# Copyright 2013 The Chromium 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 logging
import os
import re
import signal
import subprocess
import sys
import tempfile
from devil.android import device_errors # pylint: disable=import-error
from telemetry.internal.util import binary_manager
from telemetry.core import platform
from telemetry.internal.platform import profiler
from telemetry.internal.platform.profiler import android_profiling_helper
from devil.android.perf import perf_control # pylint: disable=import-error
_PERF_OPTIONS = [
# Sample across all processes and CPUs to so that the current CPU gets
# recorded to each sample.
'--all-cpus',
# In perf 3.13 --call-graph requires an argument, so use the -g short-hand
# which does not.
'-g',
# Record raw samples to get CPU information.
'--raw-samples',
# Increase sampling frequency for better coverage.
'--freq', '2000',
]
_PERF_OPTIONS_ANDROID = [
# Increase priority to avoid dropping samples. Requires root.
'--realtime', '80',
]
def _NicePath(path):
rel_path = os.path.relpath(path, os.curdir)
return rel_path if len(rel_path) < len(path) else path
def _PrepareHostForPerf():
kptr_file = '/proc/sys/kernel/kptr_restrict'
with open(kptr_file) as f:
if f.read().strip() != '0':
logging.warning('Making kernel symbols unrestricted. You might have to '
'enter your password for "sudo".')
with tempfile.NamedTemporaryFile() as zero:
zero.write('0')
zero.flush()
subprocess.call(['/usr/bin/sudo', 'cp', zero.name, kptr_file])
def _InstallPerfHost():
perfhost_name = android_profiling_helper.GetPerfhostName()
host = platform.GetHostPlatform()
if not host.CanLaunchApplication(perfhost_name):
host.InstallApplication(perfhost_name)
return binary_manager.FetchPath(perfhost_name, 'x86_64', 'linux')
class _SingleProcessPerfProfiler(object):
"""An internal class for using perf for a given process.
On android, this profiler uses pre-built binaries from AOSP.
See more details in prebuilt/android/README.txt.
"""
def __init__(self, pid, output_file, browser_backend, platform_backend,
perf_binary, perfhost_binary):
self._pid = pid
self._browser_backend = browser_backend
self._platform_backend = platform_backend
self._output_file = output_file
self._tmp_output_file = tempfile.NamedTemporaryFile('w', 0)
self._is_android = platform_backend.GetOSName() == 'android'
self._perf_binary = perf_binary
self._perfhost_binary = perfhost_binary
cmd_prefix = []
perf_args = ['record', '--pid', str(pid)]
if self._is_android:
cmd_prefix = [
browser_backend.device.adb.GetAdbPath(),
'-s', browser_backend.device.adb.GetDeviceSerial(),
'shell', perf_binary]
perf_args += _PERF_OPTIONS_ANDROID
output_file = os.path.join('/sdcard', 'perf_profiles',
os.path.basename(output_file))
self._device_output_file = output_file
browser_backend.device.RunShellCommand(
['mkdir', '-p', os.path.dirname(self._device_output_file)],
check_return=True)
browser_backend.device.RemovePath(self._device_output_file, force=True)
else:
cmd_prefix = [perf_binary]
perf_args += ['--output', output_file] + _PERF_OPTIONS
self._proc = subprocess.Popen(cmd_prefix + perf_args,
stdout=self._tmp_output_file, stderr=subprocess.STDOUT)
def CollectProfile(self):
if ('renderer' in self._output_file and
not self._is_android and
not self._platform_backend.GetCommandLine(self._pid)):
logging.warning('Renderer was swapped out during profiling. '
'To collect a full profile rerun with '
'"--extra-browser-args=--single-process"')
if self._is_android:
device = self._browser_backend.device
try:
binary_name = os.path.basename(self._perf_binary)
device.KillAll(binary_name, signum=signal.SIGINT, blocking=True,
quiet=True)
except device_errors.CommandFailedError:
logging.warning('The perf process could not be killed on the device.')
self._proc.send_signal(signal.SIGINT)
exit_code = self._proc.wait()
try:
if exit_code == 128:
raise Exception(
"""perf failed with exit code 128.
Try rerunning this script under sudo or setting
/proc/sys/kernel/perf_event_paranoid to "-1".\nOutput:\n%s""" %
self._GetStdOut())
elif exit_code not in (0, -2):
raise Exception(
'perf failed with exit code %d. Output:\n%s' % (exit_code,
self._GetStdOut()))
finally:
self._tmp_output_file.close()
cmd = '%s report -n -i %s' % (_NicePath(self._perfhost_binary),
self._output_file)
if self._is_android:
device = self._browser_backend.device
device.PullFile(self._device_output_file, self._output_file)
required_libs = \
android_profiling_helper.GetRequiredLibrariesForPerfProfile(
self._output_file)
symfs_root = os.path.join(os.path.dirname(self._output_file), 'symfs')
if not os.path.exists(symfs_root):
os.makedirs(symfs_root)
kallsyms = android_profiling_helper.CreateSymFs(device,
symfs_root,
required_libs,
use_symlinks=True)
cmd += ' --symfs %s --kallsyms %s' % (symfs_root, kallsyms)
for lib in required_libs:
lib = os.path.join(symfs_root, lib[1:])
if not os.path.exists(lib):
continue
objdump_path = android_profiling_helper.GetToolchainBinaryPath(
lib, 'objdump')
if objdump_path:
cmd += ' --objdump %s' % _NicePath(objdump_path)
break
print 'To view the profile, run:'
print ' ', cmd
return self._output_file
def _GetStdOut(self):
self._tmp_output_file.flush()
try:
with open(self._tmp_output_file.name) as f:
return f.read()
except IOError:
return ''
class PerfProfiler(profiler.Profiler):
def __init__(self, browser_backend, platform_backend, output_path, state):
super(PerfProfiler, self).__init__(
browser_backend, platform_backend, output_path, state)
process_output_file_map = self._GetProcessOutputFileMap()
self._process_profilers = []
self._perf_control = None
perf_binary = perfhost_binary = _InstallPerfHost()
try:
if platform_backend.GetOSName() == 'android':
device = browser_backend.device
perf_binary = android_profiling_helper.PrepareDeviceForPerf(device)
self._perf_control = perf_control.PerfControl(device)
self._perf_control.SetPerfProfilingMode()
else:
_PrepareHostForPerf()
for pid, output_file in process_output_file_map.iteritems():
if 'zygote' in output_file:
continue
self._process_profilers.append(
_SingleProcessPerfProfiler(
pid, output_file, browser_backend, platform_backend,
perf_binary, perfhost_binary))
except:
if self._perf_control:
self._perf_control.SetDefaultPerfMode()
raise
@classmethod
def name(cls):
return 'perf'
@classmethod
def is_supported(cls, browser_type):
if sys.platform != 'linux2':
return False
if platform.GetHostPlatform().GetOSName() == 'chromeos':
return False
return True
@classmethod
def CustomizeBrowserOptions(cls, browser_type, options):
options.AppendExtraBrowserArgs([
'--no-sandbox',
'--allow-sandbox-debugging',
])
def CollectProfile(self):
if self._perf_control:
self._perf_control.SetDefaultPerfMode()
output_files = []
for single_process in self._process_profilers:
output_files.append(single_process.CollectProfile())
return output_files
@classmethod
def GetTopSamples(cls, file_name, number):
"""Parses the perf generated profile in |file_name| and returns a
{function: period} dict of the |number| hottests functions.
"""
assert os.path.exists(file_name)
with open(os.devnull, 'w') as devnull:
_InstallPerfHost()
report = subprocess.Popen(
[android_profiling_helper.GetPerfhostName(),
'report', '--show-total-period', '-U', '-t', '^', '-i', file_name],
stdout=subprocess.PIPE, stderr=devnull).communicate()[0]
period_by_function = {}
for line in report.split('\n'):
if not line or line.startswith('#'):
continue
fields = line.split('^')
if len(fields) != 5:
continue
period = int(fields[1])
function = fields[4].partition(' ')[2]
function = re.sub('<.*>', '', function) # Strip template params.
function = re.sub('[(].*[)]', '', function) # Strip function params.
period_by_function[function] = period
if len(period_by_function) == number:
break
return period_by_function
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