tools/profile_chrome/perf_controller.py

   1 # Copyright 2014 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 import logging
   6 import os
   7 import signal
   8 import subprocess
   9 import sys
  10 import tempfile
  11
  12 from profile_chrome import controllers
  13 from profile_chrome import ui
  14
  15 from pylib import android_commands
  16 from pylib import constants
  17 from pylib.perf import perf_control
  18
  19 sys.path.append(os.path.join(constants.DIR_SOURCE_ROOT,
  20                              'tools',
  21                              'telemetry'))
  22 try:
  23   # pylint: disable=F0401
  24   from telemetry.core.platform.profiler import android_profiling_helper
  25   from telemetry.util import support_binaries
  26 except ImportError:
  27   android_profiling_helper = None
  28   support_binaries = None
  29
  30
  31 _PERF_OPTIONS = [
  32     # Sample across all processes and CPUs to so that the current CPU gets
  33     # recorded to each sample.
  34     '--all-cpus',
  35     # In perf 3.13 --call-graph requires an argument, so use the -g short-hand
  36     # which does not.
  37     '-g',
  38     # Increase priority to avoid dropping samples. Requires root.
  39     '--realtime', '80',
  40     # Record raw samples to get CPU information.
  41     '--raw-samples',
  42     # Increase sampling frequency for better coverage.
  43     '--freq', '2000',
  44 ]
  45
  46
  47 class _PerfProfiler(object):
  48   def __init__(self, device, perf_binary, categories):
  49     self._device = device
  50     self._output_file = android_commands.DeviceTempFile(
  51         self._device.old_interface, prefix='perf_output')
  52     self._log_file = tempfile.TemporaryFile()
  53
  54     # TODO(jbudorick) Look at providing a way to unhandroll this once the
  55     #                 adb rewrite has fully landed.
  56     device_param = (['-s', str(self._device)] if str(self._device) else [])
  57     cmd = ['adb'] + device_param + \
  58           ['shell', perf_binary, 'record',
  59            '--output', self._output_file.name] + _PERF_OPTIONS
  60     if categories:
  61       cmd += ['--event', ','.join(categories)]
  62     self._perf_control = perf_control.PerfControl(self._device)
  63     self._perf_control.SetPerfProfilingMode()
  64     self._perf_process = subprocess.Popen(cmd,
  65                                           stdout=self._log_file,
  66                                           stderr=subprocess.STDOUT)
  67
  68   def SignalAndWait(self):
  69     self._device.KillAll('perf', signum=signal.SIGINT)
  70     self._perf_process.wait()
  71     self._perf_control.SetDefaultPerfMode()
  72
  73   def _FailWithLog(self, msg):
  74     self._log_file.seek(0)
  75     log = self._log_file.read()
  76     raise RuntimeError('%s. Log output:\n%s' % (msg, log))
  77
  78   def PullResult(self, output_path):
  79     if not self._device.FileExists(self._output_file.name):
  80       self._FailWithLog('Perf recorded no data')
  81
  82     perf_profile = os.path.join(output_path,
  83                                 os.path.basename(self._output_file.name))
  84     self._device.PullFile(self._output_file.name, perf_profile)
  85     if not os.stat(perf_profile).st_size:
  86       os.remove(perf_profile)
  87       self._FailWithLog('Perf recorded a zero-sized file')
  88
  89     self._log_file.close()
  90     self._output_file.close()
  91     return perf_profile
  92
  93
  94 class PerfProfilerController(controllers.BaseController):
  95   def __init__(self, device, categories):
  96     controllers.BaseController.__init__(self)
  97     self._device = device
  98     self._categories = categories
  99     self._perf_binary = self._PrepareDevice(device)
 100     self._perf_instance = None
 101
 102   def __repr__(self):
 103     return 'perf profile'
 104
 105   @staticmethod
 106   def IsSupported():
 107     return bool(android_profiling_helper)
 108
 109   @staticmethod
 110   def _PrepareDevice(device):
 111     if not 'BUILDTYPE' in os.environ:
 112       os.environ['BUILDTYPE'] = 'Release'
 113     return android_profiling_helper.PrepareDeviceForPerf(device)
 114
 115   @classmethod
 116   def GetCategories(cls, device):
 117     perf_binary = cls._PrepareDevice(device)
 118     return device.RunShellCommand('%s list' % perf_binary)
 119
 120   def StartTracing(self, _):
 121     self._perf_instance = _PerfProfiler(self._device,
 122                                         self._perf_binary,
 123                                         self._categories)
 124
 125   def StopTracing(self):
 126     if not self._perf_instance:
 127       return
 128     self._perf_instance.SignalAndWait()
 129
 130   @staticmethod
 131   def _GetInteractivePerfCommand(perfhost_path, perf_profile, symfs_dir,
 132                                  required_libs, kallsyms):
 133     cmd = '%s report -n -i %s --symfs %s --kallsyms %s' % (
 134         os.path.relpath(perfhost_path, '.'), perf_profile, symfs_dir, kallsyms)
 135     for lib in required_libs:
 136       lib = os.path.join(symfs_dir, lib[1:])
 137       if not os.path.exists(lib):
 138         continue
 139       objdump_path = android_profiling_helper.GetToolchainBinaryPath(
 140           lib, 'objdump')
 141       if objdump_path:
 142         cmd += ' --objdump %s' % os.path.relpath(objdump_path, '.')
 143         break
 144     return cmd
 145
 146   def PullTrace(self):
 147     symfs_dir = os.path.join(tempfile.gettempdir(),
 148                              os.path.expandvars('$USER-perf-symfs'))
 149     if not os.path.exists(symfs_dir):
 150       os.makedirs(symfs_dir)
 151     required_libs = set()
 152
 153     # Download the recorded perf profile.
 154     perf_profile = self._perf_instance.PullResult(symfs_dir)
 155     required_libs = \
 156         android_profiling_helper.GetRequiredLibrariesForPerfProfile(
 157             perf_profile)
 158     if not required_libs:
 159       logging.warning('No libraries required by perf trace. Most likely there '
 160                       'are no samples in the trace.')
 161
 162     # Build a symfs with all the necessary libraries.
 163     kallsyms = android_profiling_helper.CreateSymFs(self._device,
 164                                                     symfs_dir,
 165                                                     required_libs,
 166                                                     use_symlinks=False)
 167     perfhost_path = support_binaries.FindPath('perfhost', 'linux')
 168
 169     ui.PrintMessage('\nNote: to view the profile in perf, run:')
 170     ui.PrintMessage('  ' + self._GetInteractivePerfCommand(perfhost_path,
 171         perf_profile, symfs_dir, required_libs, kallsyms))
 172
 173     # Convert the perf profile into JSON.
 174     perf_script_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),
 175                                     'third_party', 'perf_to_tracing.py')
 176     json_file_name = os.path.basename(perf_profile)
 177     with open(os.devnull, 'w') as dev_null, \
 178         open(json_file_name, 'w') as json_file:
 179       cmd = [perfhost_path, 'script', '-s', perf_script_path, '-i',
 180              perf_profile, '--symfs', symfs_dir, '--kallsyms', kallsyms]
 181       if subprocess.call(cmd, stdout=json_file, stderr=dev_null):
 182         logging.warning('Perf data to JSON conversion failed. The result will '
 183                         'not contain any perf samples. You can still view the '
 184                         'perf data manually as shown above.')
 185         return None
 186
 187     return json_file_name