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
3 # found in the LICENSE file.
5 from pylib import android_commands
6 from pylib.device import device_utils
8 class CacheControl(object):
9 _DROP_CACHES = '/proc/sys/vm/drop_caches'
11 def __init__(self, device):
12 # TODO(jbudorick) Remove once telemetry gets switched over.
13 if isinstance(device, android_commands.AndroidCommands):
14 device = device_utils.DeviceUtils(device)
17 def DropRamCaches(self):
18 """Drops the filesystem ram caches for performance testing."""
19 self._device.RunShellCommand('sync', as_root=True)
20 self._device.WriteFile(CacheControl._DROP_CACHES, '3', as_root=True)