diff options
Diffstat (limited to 'third_party/catapult/devil/devil/android/perf/perf_control.py')
| -rw-r--r-- | third_party/catapult/devil/devil/android/perf/perf_control.py | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/third_party/catapult/devil/devil/android/perf/perf_control.py b/third_party/catapult/devil/devil/android/perf/perf_control.py deleted file mode 100644 index 06a5db61e5..0000000000 --- a/third_party/catapult/devil/devil/android/perf/perf_control.py +++ /dev/null @@ -1,210 +0,0 @@ -# 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 atexit -import logging -import re - -from devil.android import device_errors - -logger = logging.getLogger(__name__) - - -class PerfControl(object): - """Provides methods for setting the performance mode of a device.""" - - _AVAILABLE_GOVERNORS_REL_PATH = 'cpufreq/scaling_available_governors' - _CPU_FILE_PATTERN = re.compile(r'^cpu\d+$') - _CPU_PATH = '/sys/devices/system/cpu' - _KERNEL_MAX = '/sys/devices/system/cpu/kernel_max' - - def __init__(self, device): - self._device = device - self._cpu_files = [ - filename - for filename in self._device.ListDirectory(self._CPU_PATH, as_root=True) - if self._CPU_FILE_PATTERN.match(filename)] - assert self._cpu_files, 'Failed to detect CPUs.' - self._cpu_file_list = ' '.join(self._cpu_files) - logger.info('CPUs found: %s', self._cpu_file_list) - - self._have_mpdecision = self._device.FileExists('/system/bin/mpdecision') - - raw = self._ReadEachCpuFile(self._AVAILABLE_GOVERNORS_REL_PATH) - self._available_governors = [ - (cpu, raw_governors.strip().split() if not exit_code else None) - for cpu, raw_governors, exit_code in raw] - - def SetHighPerfMode(self): - """Sets the highest stable performance mode for the device.""" - try: - self._device.EnableRoot() - except device_errors.CommandFailedError: - message = 'Need root for performance mode. Results may be NOISY!!' - logger.warning(message) - # Add an additional warning at exit, such that it's clear that any results - # may be different/noisy (due to the lack of intended performance mode). - atexit.register(logger.warning, message) - return - - product_model = self._device.product_model - # TODO(epenner): Enable on all devices (http://crbug.com/383566) - if 'Nexus 4' == product_model: - self._ForceAllCpusOnline(True) - if not self._AllCpusAreOnline(): - logger.warning('Failed to force CPUs online. Results may be NOISY!') - self.SetScalingGovernor('performance') - elif 'Nexus 5' == product_model: - self._ForceAllCpusOnline(True) - if not self._AllCpusAreOnline(): - logger.warning('Failed to force CPUs online. Results may be NOISY!') - self.SetScalingGovernor('performance') - self._SetScalingMaxFreq(1190400) - self._SetMaxGpuClock(200000000) - else: - self.SetScalingGovernor('performance') - - def SetPerfProfilingMode(self): - """Enables all cores for reliable perf profiling.""" - self._ForceAllCpusOnline(True) - self.SetScalingGovernor('performance') - if not self._AllCpusAreOnline(): - if not self._device.HasRoot(): - raise RuntimeError('Need root to force CPUs online.') - raise RuntimeError('Failed to force CPUs online.') - - def SetDefaultPerfMode(self): - """Sets the performance mode for the device to its default mode.""" - if not self._device.HasRoot(): - return - product_model = self._device.product_model - if 'Nexus 5' == product_model: - if self._AllCpusAreOnline(): - self._SetScalingMaxFreq(2265600) - self._SetMaxGpuClock(450000000) - - governor_mode = { - 'GT-I9300': 'pegasusq', - 'Galaxy Nexus': 'interactive', - 'Nexus 4': 'ondemand', - 'Nexus 5': 'ondemand', - 'Nexus 7': 'interactive', - 'Nexus 10': 'interactive' - }.get(product_model, 'ondemand') - self.SetScalingGovernor(governor_mode) - self._ForceAllCpusOnline(False) - - def GetCpuInfo(self): - online = (output.rstrip() == '1' and status == 0 - for (_, output, status) in self._ForEachCpu('cat "$CPU/online"')) - governor = (output.rstrip() if status == 0 else None - for (_, output, status) - in self._ForEachCpu('cat "$CPU/cpufreq/scaling_governor"')) - return zip(self._cpu_files, online, governor) - - def _ForEachCpu(self, cmd): - script = '; '.join([ - 'for CPU in %s' % self._cpu_file_list, - 'do %s' % cmd, - 'echo -n "%~%$?%~%"', - 'done' - ]) - output = self._device.RunShellCommand( - script, cwd=self._CPU_PATH, check_return=True, as_root=True, shell=True) - output = '\n'.join(output).split('%~%') - return zip(self._cpu_files, output[0::2], (int(c) for c in output[1::2])) - - def _WriteEachCpuFile(self, path, value): - self._ConditionallyWriteEachCpuFile(path, value, condition='true') - - def _ConditionallyWriteEachCpuFile(self, path, value, condition): - template = ( - '{condition} && test -e "$CPU/{path}" && echo {value} > "$CPU/{path}"') - results = self._ForEachCpu( - template.format(path=path, value=value, condition=condition)) - cpus = ' '.join(cpu for (cpu, _, status) in results if status == 0) - if cpus: - logger.info('Successfully set %s to %r on: %s', path, value, cpus) - else: - logger.warning('Failed to set %s to %r on any cpus', path, value) - - def _ReadEachCpuFile(self, path): - return self._ForEachCpu( - 'cat "$CPU/{path}"'.format(path=path)) - - def SetScalingGovernor(self, value): - """Sets the scaling governor to the given value on all possible CPUs. - - This does not attempt to set a governor to a value not reported as available - on the corresponding CPU. - - Args: - value: [string] The new governor value. - """ - condition = 'test -e "{path}" && grep -q {value} {path}'.format( - path=('${CPU}/%s' % self._AVAILABLE_GOVERNORS_REL_PATH), - value=value) - self._ConditionallyWriteEachCpuFile( - 'cpufreq/scaling_governor', value, condition) - - def GetScalingGovernor(self): - """Gets the currently set governor for each CPU. - - Returns: - An iterable of 2-tuples, each containing the cpu and the current - governor. - """ - raw = self._ReadEachCpuFile('cpufreq/scaling_governor') - return [ - (cpu, raw_governor.strip() if not exit_code else None) - for cpu, raw_governor, exit_code in raw] - - def ListAvailableGovernors(self): - """Returns the list of available governors for each CPU. - - Returns: - An iterable of 2-tuples, each containing the cpu and a list of available - governors for that cpu. - """ - return self._available_governors - - def _SetScalingMaxFreq(self, value): - self._WriteEachCpuFile('cpufreq/scaling_max_freq', '%d' % value) - - def _SetMaxGpuClock(self, value): - self._device.WriteFile('/sys/class/kgsl/kgsl-3d0/max_gpuclk', - str(value), - as_root=True) - - def _AllCpusAreOnline(self): - results = self._ForEachCpu('cat "$CPU/online"') - # TODO(epenner): Investigate why file may be missing - # (http://crbug.com/397118) - return all(output.rstrip() == '1' and status == 0 - for (cpu, output, status) in results - if cpu != 'cpu0') - - def _ForceAllCpusOnline(self, force_online): - """Enable all CPUs on a device. - - Some vendors (or only Qualcomm?) hot-plug their CPUs, which can add noise - to measurements: - - In perf, samples are only taken for the CPUs that are online when the - measurement is started. - - The scaling governor can't be set for an offline CPU and frequency scaling - on newly enabled CPUs adds noise to both perf and tracing measurements. - - It appears Qualcomm is the only vendor that hot-plugs CPUs, and on Qualcomm - this is done by "mpdecision". - - """ - if self._have_mpdecision: - cmd = ['stop', 'mpdecision'] if force_online else ['start', 'mpdecision'] - self._device.RunShellCommand(cmd, check_return=True, as_root=True) - - if not self._have_mpdecision and not self._AllCpusAreOnline(): - logger.warning('Unexpected cpu hot plugging detected.') - - if force_online: - self._ForEachCpu('echo 1 > "$CPU/online"') |