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

tools/android/adb_profile_chrome/perf_controller.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.
 
 import logging
 import os
 import subprocess
 import sys
 import tempfile
 
@@ skipping 40 matching lines @@
     self._log_file = tempfile.TemporaryFile()
 
     device_param = (['-s', self._device.old_interface.GetDevice()]
                     if self._device.old_interface.GetDevice() else [])
     cmd = ['adb'] + device_param + \
           ['shell', perf_binary, 'record',
            '--output', self._output_file.name] + _PERF_OPTIONS
     if categories:
       cmd += ['--event', ','.join(categories)]
     self._perf_control = perf_control.PerfControl(self._device)
-    self._perf_control.ForceAllCpusOnline(True)
+    self._perf_control.ForceHighPerfMode(True)

[Sami, 2014/06/19 18:12:43]

True should be removed, right?

BTW, tools/android/adb_profile_chrome/run_tests should catch this -- also not on
any bots atm. :(

[epenner, 2014/06/19 23:58:50]

Thanks. I ran the above and the other test manually for the latest patch.

     self._perf_process = subprocess.Popen(cmd,
                                           stdout=self._log_file,
                                           stderr=subprocess.STDOUT)
 
   def SignalAndWait(self):
     perf_pids = self._device.old_interface.ExtractPid('perf')
     self._device.RunShellCommand('kill -SIGINT ' + ' '.join(perf_pids))
     self._perf_process.wait()
-    self._perf_control.ForceAllCpusOnline(False)
+    self._perf_control.SetDefaultPerfMode()
 
   def _FailWithLog(self, msg):
     self._log_file.seek(0)
     log = self._log_file.read()
     raise RuntimeError('%s. Log output:\n%s' % (msg, log))
 
   def PullResult(self, output_path):
     if not self._device.old_interface.FileExistsOnDevice(
         self._output_file.name):
       self._FailWithLog('Perf recorded no data')
@@ skipping 100 matching lines @@
         open(json_file_name, 'w') as json_file:
       cmd = [perfhost_path, 'script', '-s', perf_script_path, '-i',
              perf_profile, '--symfs', symfs_dir, '--kallsyms', kallsyms]
       if subprocess.call(cmd, stdout=json_file, stderr=dev_null):
         logging.warning('Perf data to JSON conversion failed. The result will '
                         'not contain any perf samples. You can still view the '
                         'perf data manually as shown above.')
         return None
 
     return json_file_name