| # 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. |
| |
| from pylib import android_commands |
| from pylib.device import device_utils |
| |
| class CacheControl(object): |
| _DROP_CACHES = '/proc/sys/vm/drop_caches' |
| |
| def __init__(self, device): |
| # TODO(jbudorick) Remove once telemetry gets switched over. |
| if isinstance(device, android_commands.AndroidCommands): |
| device = device_utils.DeviceUtils(device) |
| self._device = device |
| |
| def DropRamCaches(self): |
| """Drops the filesystem ram caches for performance testing.""" |
| self._device.RunShellCommand('sync', as_root=True) |
| self._device.WriteFile(CacheControl._DROP_CACHES, '3', as_root=True) |
| |
