Add hardware monitoring to skpbench

tools/skpbench/_hardware_android.py

Index: tools/skpbench/_hardware_android.py
diff --git a/tools/skpbench/_hardware_android.py b/tools/skpbench/_hardware_android.py
new file mode 100644
index 0000000000000000000000000000000000000000..a752ff5d93421822e8b5b121f17fc295add52b6d
--- /dev/null
+++ b/tools/skpbench/_hardware_android.py
@@ -0,0 +1,93 @@
+# Copyright 2016 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from __future__ import print_function
+from _hardware import Hardware
+import sys
+import time
+
+class HardwareAndroid(Hardware):
+  def __init__(self, adb):
+    Hardware.__init__(self)
+    self.kick_in_time = 5
+    self._adb = adb
+    self._is_root = self._adb.attempt_root()
+    if self._is_root:
+      self._adb.remount()
+    self._initial_airplane_mode = None
+    self._initial_location_providers = None
+    self._initial_ASLR = None
+
+  def __enter__(self):
+    # turn on airplane mode.
+    self._initial_airplane_mode = \
+      self._adb.check('settings get global airplane_mode_on')
+    self._adb.shell('settings put global airplane_mode_on 1')
+
+    # disable GPS.
+    self._initial_location_providers = \
+      self._adb.check('settings get secure location_providers_allowed')
+    self._initial_location_providers = \
+      self._initial_location_providers.replace(',', ' ')
+    self._adb.shell('''\
+      for PROVIDER in %s; do
+        settings put secure location_providers_allowed -$PROVIDER
+      done''' % self._initial_location_providers)
+
+    if self._is_root:
+      # disable bluetooth, wifi, and mobile data.
+      # TODO: can we query these initial values?
+      self._adb.shell('''\
+        service call bluetooth_manager 8 &&
+        svc wifi disable &&
+        svc data disable''')
+
+      # kill the gui.
+      self._adb.shell('''\
+        setprop ctl.stop media &&
+        setprop ctl.stop zygote &&
+        setprop ctl.stop surfaceflinger &&
+        setprop ctl.stop drm''')
+
+      # disable ASLR.
+      self._initial_ASLR = \
+        self._adb.check('cat /proc/sys/kernel/randomize_va_space')
+      self._adb.shell('echo 0 > /proc/sys/kernel/randomize_va_space')
+    else:
+      print("WARNING: no adb root access; results may be unreliable.",
+            file=sys.stderr)
+
+    return Hardware.__enter__(self)
+
+  def __exit__(self, exception_type, exception_value, traceback):
+    Hardware.__exit__(self, exception_type, exception_value, traceback)
+
+    if self._is_root:
+      # restore ASLR.
+      self._adb.shell('echo %s > /proc/sys/kernel/randomize_va_space' %
+                      self._initial_ASLR)
+
+      # revive the gui.
+      self._adb.shell('''\
+        setprop ctl.start drm &&
+        setprop ctl.start surfaceflinger &&
+        setprop ctl.start zygote &&
+        setprop ctl.start media''')
+
+    # restore GPS (doesn't seem to work if we killed the gui).
+    self._adb.shell('''\
+      for PROVIDER in %s; do
+        settings put secure location_providers_allowed +$PROVIDER
+      done''' % self._initial_location_providers)
+
+    # restore airplane mode (doesn't seem to work if we killed the gui).
+    self._adb.shell('settings put global airplane_mode_on %s' %
+                    self._initial_airplane_mode)
+
+  def sanity_check(self):
+    Hardware.sanity_check(self)
+
+  def sleep(self, sleeptime):
+    Hardware.sleep(self, sleeptime)