Tab Switching Benchmark for ChromeOS

tools/perf/contrib/cros_benchmarks/cros_utils.py

+# Copyright 2017 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 os
+import subprocess
+
+def FindKeyboardDevice(dut_ip):
+  # find the device support events EV=120013

[bccheng, 2017/05/19 09:09:14]

find if the device supports event "EV=120013"

[deanliao_goog, 2017/05/19 09:49:46]

Comment should be English sentence, which means it should have capital first
word and period at the end.

[vovoy, 2017/05/22 03:54:07]

Done.

+  cmd =  ['ssh', 'root@' + dut_ip, 'cat', '/proc/bus/input/devices']
+  p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
+  out = p.communicate()[0]
+  for line in out.splitlines():
+    handler_prefix = 'H: Handlers='
+    if line.startswith(handler_prefix):
+      handlers = line[len(handler_prefix):].split()
+    kbd_event = 'B: EV=120013'
+    if line.startswith(kbd_event):
+      for handler in handlers:
+        if handler.startswith('event'):
+          return '/dev/input/' + handler
+  raise Exception('keyboard device not found')
+
+def SetupKeyDispatch(dut_ip):
+  cur_dir=os.path.dirname(os.path.abspath(__file__))

[bccheng, 2017/05/19 09:09:14]

space around =

[vovoy, 2017/05/22 03:54:07]

Done.

+  send_key_filename = cur_dir + '/data/send_key_tab_switch'
+  log_key_filename = cur_dir + '/data/log_key_tab_switch'
+
+  kbd_dev = FindKeyboardDevice(dut_ip)
+  send_key_content = '#!/bin/bash\n'
+  send_key_content += ('evemu-play --insert-slot0 ' + kbd_dev +
+                       ' < /home/root/log_key_tab_switch')
+  with open(send_key_filename, 'w') as f:
+    f.write(send_key_content)
+  os.chmod(send_key_filename, 0774)
+
+  os.system('scp -q %s root@%s:/usr/local/tmp/' % (log_key_filename, dut_ip))
+  os.system('scp -q %s root@%s:/usr/local/tmp/' % (send_key_filename, dut_ip))
+
+def SwitchTab(platform_backend):
+  platform_backend.RunCommand('/usr/local/tmp/send_key_tab_switch')
+
+def NoScreenOff(platform_backend):
+  platform_backend.RunCommand('set_power_policy --ac_screen_off_delay=3600')
+  platform_backend.RunCommand('set_power_policy --ac_screen_dim_delay=3500')