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1 # Copyright 2013 The Chromium Authors. All rights reserved. | 1 # Copyright 2013 The Chromium Authors. All rights reserved. |
2 # Use of this source code is governed by a BSD-style license that can be | 2 # Use of this source code is governed by a BSD-style license that can be |
3 # found in the LICENSE file. | 3 # found in the LICENSE file. |
4 | 4 |
5 import atexit | 5 import atexit |
6 import logging | 6 import logging |
7 | 7 |
8 from devil.android import device_errors | 8 from devil.android import device_errors |
9 from devil.android import device_utils | |
10 | 9 |
11 | 10 |
12 class PerfControl(object): | 11 class PerfControl(object): |
13 """Provides methods for setting the performance mode of a device.""" | 12 """Provides methods for setting the performance mode of a device.""" |
14 _CPU_PATH = '/sys/devices/system/cpu' | 13 _CPU_PATH = '/sys/devices/system/cpu' |
15 _KERNEL_MAX = '/sys/devices/system/cpu/kernel_max' | 14 _KERNEL_MAX = '/sys/devices/system/cpu/kernel_max' |
16 | 15 |
17 def __init__(self, device): | 16 def __init__(self, device): |
18 self._device = device | 17 self._device = device |
19 # this will raise an AdbCommandFailedError if no CPU files are found | 18 # this will raise an AdbCommandFailedError if no CPU files are found |
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148 """ | 147 """ |
149 if self._have_mpdecision: | 148 if self._have_mpdecision: |
150 script = 'stop mpdecision' if force_online else 'start mpdecision' | 149 script = 'stop mpdecision' if force_online else 'start mpdecision' |
151 self._device.RunShellCommand(script, check_return=True, as_root=True) | 150 self._device.RunShellCommand(script, check_return=True, as_root=True) |
152 | 151 |
153 if not self._have_mpdecision and not self._AllCpusAreOnline(): | 152 if not self._have_mpdecision and not self._AllCpusAreOnline(): |
154 logging.warning('Unexpected cpu hot plugging detected.') | 153 logging.warning('Unexpected cpu hot plugging detected.') |
155 | 154 |
156 if force_online: | 155 if force_online: |
157 self._ForEachCpu('echo 1 > "$CPU/online"') | 156 self._ForEachCpu('echo 1 > "$CPU/online"') |
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