Telemetry: Set scaling governor on all cpus (on all devices)

build/android/pylib/perf/perf_control_unittest.py

 # Copyright 2014 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.
+# pylint: disable=W0212
 
 import os
 import sys
 import unittest
 
 sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
 
 from pylib import android_commands
 from pylib.device import device_utils
 from pylib.perf import perf_control
 
-
 class TestPerfControl(unittest.TestCase):
   def setUp(self):
     if not os.getenv('BUILDTYPE'):
       os.environ['BUILDTYPE'] = 'Debug'
 
     devices = android_commands.GetAttachedDevices()
     self.assertGreater(len(devices), 0, 'No device attached!')
     self._device = device_utils.DeviceUtils(
         android_commands.AndroidCommands(device=devices[0]))
 
-  def testForceAllCpusOnline(self):
+  def testHighPerfMode(self):
     perf = perf_control.PerfControl(self._device)
-    cpu_online_files = self._device.RunShellCommand(
-        'ls -d /sys/devices/system/cpu/cpu[0-9]*/online')
     try:
-      perf.ForceAllCpusOnline(True)
-      for path in cpu_online_files:
+      perf.SetPerfProfilingMode()
+      for cpu in range(perf._NumCpuCores):
+        path = perf_control.PerfControl._CPU_ONLINE_FMT % cpu
         self.assertEquals('1',
                           self._device.old_interface.GetFileContents(path)[0])
-        mode = self._device.RunShellCommand('ls -l %s' % path)[0]
-        self.assertEquals('-r--r--r--', mode[:10])
+        path = perf_control.PerfControl._SCALING_GOVERNOR_FMT % cpu
+        self.assertEquals('performance',
+                          self._device.old_interface.GetFileContents(path)[0])
     finally:
-      perf.ForceAllCpusOnline(False)
-
-    for path in cpu_online_files:
-      mode = self._device.RunShellCommand('ls -l %s' % path)[0]
-      self.assertEquals('-rw-r--r--', mode[:10])
-
+      perf.SetDefaultPerfMode()
 
 if __name__ == '__main__':
   unittest.main()