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# Copyright 2014 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 signal
import subprocess
import sys
import tempfile
from profile_chrome import controllers
from profile_chrome import ui
from pylib import android_commands
from pylib import constants
from pylib.perf import perf_control
sys.path.append(os.path.join(constants.DIR_SOURCE_ROOT,
'tools',
'telemetry'))
try:
# pylint: disable=F0401
from telemetry.core.platform.profiler import android_profiling_helper
from telemetry.util import support_binaries
except ImportError:
android_profiling_helper = None
support_binaries = None
_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',
# Increase priority to avoid dropping samples. Requires root.
'--realtime', '80',
# Record raw samples to get CPU information.
'--raw-samples',
# Increase sampling frequency for better coverage.
'--freq', '2000',
]
class _PerfProfiler(object):
def __init__(self, device, perf_binary, categories):
self._device = device
self._output_file = android_commands.DeviceTempFile(
self._device.old_interface, prefix='perf_output')
self._log_file = tempfile.TemporaryFile()
# TODO(jbudorick) Look at providing a way to unhandroll this once the
# adb rewrite has fully landed.
device_param = (['-s', str(self._device)] if str(self._device) else [])
cmd = ['adb'] + device_param + \
['shell', perf_binary, 'record',
'--output', self._output_file.name] + _PERF_OPTIONS
if categories:
cmd += ['--event', ','.join(categories)]
self._perf_control = perf_control.PerfControl(self._device)
self._perf_control.SetPerfProfilingMode()
self._perf_process = subprocess.Popen(cmd,
stdout=self._log_file,
stderr=subprocess.STDOUT)
def SignalAndWait(self):
self._device.KillAll('perf', signum=signal.SIGINT)
self._perf_process.wait()
self._perf_control.SetDefaultPerfMode()
def _FailWithLog(self, msg):
self._log_file.seek(0)
log = self._log_file.read()
raise RuntimeError('%s. Log output:\n%s' % (msg, log))
def PullResult(self, output_path):
if not self._device.FileExists(self._output_file.name):
self._FailWithLog('Perf recorded no data')
perf_profile = os.path.join(output_path,
os.path.basename(self._output_file.name))
self._device.PullFile(self._output_file.name, perf_profile)
if not os.stat(perf_profile).st_size:
os.remove(perf_profile)
self._FailWithLog('Perf recorded a zero-sized file')
self._log_file.close()
self._output_file.close()
return perf_profile
class PerfProfilerController(controllers.BaseController):
def __init__(self, device, categories):
controllers.BaseController.__init__(self)
self._device = device
self._categories = categories
self._perf_binary = self._PrepareDevice(device)
self._perf_instance = None
def __repr__(self):
return 'perf profile'
@staticmethod
def IsSupported():
return bool(android_profiling_helper)
@staticmethod
def _PrepareDevice(device):
if not 'BUILDTYPE' in os.environ:
os.environ['BUILDTYPE'] = 'Release'
return android_profiling_helper.PrepareDeviceForPerf(device)
@classmethod
def GetCategories(cls, device):
perf_binary = cls._PrepareDevice(device)
return device.RunShellCommand('%s list' % perf_binary)
def StartTracing(self, _):
self._perf_instance = _PerfProfiler(self._device,
self._perf_binary,
self._categories)
def StopTracing(self):
if not self._perf_instance:
return
self._perf_instance.SignalAndWait()
@staticmethod
def _GetInteractivePerfCommand(perfhost_path, perf_profile, symfs_dir,
required_libs, kallsyms):
cmd = '%s report -n -i %s --symfs %s --kallsyms %s' % (
os.path.relpath(perfhost_path, '.'), perf_profile, symfs_dir, kallsyms)
for lib in required_libs:
lib = os.path.join(symfs_dir, lib[1:])
if not os.path.exists(lib):
continue
objdump_path = android_profiling_helper.GetToolchainBinaryPath(
lib, 'objdump')
if objdump_path:
cmd += ' --objdump %s' % os.path.relpath(objdump_path, '.')
break
return cmd
def PullTrace(self):
symfs_dir = os.path.join(tempfile.gettempdir(),
os.path.expandvars('$USER-perf-symfs'))
if not os.path.exists(symfs_dir):
os.makedirs(symfs_dir)
required_libs = set()
# Download the recorded perf profile.
perf_profile = self._perf_instance.PullResult(symfs_dir)
required_libs = \
android_profiling_helper.GetRequiredLibrariesForPerfProfile(
perf_profile)
if not required_libs:
logging.warning('No libraries required by perf trace. Most likely there '
'are no samples in the trace.')
# Build a symfs with all the necessary libraries.
kallsyms = android_profiling_helper.CreateSymFs(self._device,
symfs_dir,
required_libs,
use_symlinks=False)
perfhost_path = support_binaries.FindPath(
android_profiling_helper.GetPerfhostName(), 'linux')
ui.PrintMessage('\nNote: to view the profile in perf, run:')
ui.PrintMessage(' ' + self._GetInteractivePerfCommand(perfhost_path,
perf_profile, symfs_dir, required_libs, kallsyms))
# Convert the perf profile into JSON.
perf_script_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),
'third_party', 'perf_to_tracing.py')
json_file_name = os.path.basename(perf_profile)
with open(os.devnull, 'w') as dev_null, \
open(json_file_name, 'w') as json_file:
cmd = [perfhost_path, 'script', '-s', perf_script_path, '-i',
perf_profile, '--symfs', symfs_dir, '--kallsyms', kallsyms]
if subprocess.call(cmd, stdout=json_file, stderr=dev_null):
logging.warning('Perf data to JSON conversion failed. The result will '
'not contain any perf samples. You can still view the '
'perf data manually as shown above.')
return None
return json_file_name
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