| # 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. | |
| class CacheControl(object): | |
| _DROP_CACHES = '/proc/sys/vm/drop_caches' | |
| def __init__(self, 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) | |