Telemetry: Linux-based backends should return CPU results in seconds, not jiffies.

tools/telemetry/telemetry/core/platform/linux_based_platform_backend_unittest.py

 # Copyright 2013 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 unittest
 
 from telemetry.core import util
 from telemetry.core.platform import linux_based_platform_backend
 
 
 class TestBackend(linux_based_platform_backend.LinuxBasedPlatformBackend):
 
   # pylint: disable=W0223
 
   def __init__(self):
     super(TestBackend, self).__init__()
     self._mock_files = {}
 
   def SetMockFile(self, filename, output):
     self._mock_files[filename] = output
 
   def GetFileContents(self, filename):
     return self._mock_files[filename]
 
+  def GetClockTicks(self):
+    return 41
 
 class LinuxBasedPlatformBackendTest(unittest.TestCase):
 
+  def testGetCpuStatsBasic(self):
+    if not linux_based_platform_backend.resource:
+      logging.warning('Test not supported')
+      return
+
+    backend = TestBackend()
+    with open(os.path.join(util.GetUnittestDataDir(), 'stat')) as f:
+      backend.SetMockFile('/proc/1/stat', f.read())

[jeremy, 2014/10/29 06:11:32]

IMHO it might be a bit cleaner if you split these 2 lines into a function?

[Lei Zhang, 2014/10/29 07:03:08]

Done. Can you take a look again to make sure I did what I think you asked?

+    result = backend.GetCpuStats(1)
+    self.assertEquals(result, {'CpuProcessTime': 22.0})
+
+  def testGetCpuTimestampBasic(self):
+    if not linux_based_platform_backend.resource:
+      logging.warning('Test not supported')
+      return
+
+    backend = TestBackend()
+    with open(os.path.join(util.GetUnittestDataDir(), 'timer_list')) as f:
+      backend.SetMockFile('/proc/timer_list', f.read())
+    result = backend.GetCpuTimestamp()
+    self.assertEquals(result, {'TotalTime': 105054633.0})
+
   def testGetMemoryStatsBasic(self):
     if not linux_based_platform_backend.resource:
       logging.warning('Test not supported')
       return
 
     backend = TestBackend()
     with open(os.path.join(util.GetUnittestDataDir(), 'stat')) as f:
       backend.SetMockFile('/proc/1/stat', f.read())
     with open(os.path.join(util.GetUnittestDataDir(), 'status')) as f:
       backend.SetMockFile('/proc/1/status', f.read())
@@ skipping 17 matching lines @@
     with open(os.path.join(util.GetUnittestDataDir(), 'status_nohwm')) as f:
       backend.SetMockFile('/proc/1/status', f.read())
     with open(os.path.join(util.GetUnittestDataDir(), 'smaps')) as f:
       backend.SetMockFile('/proc/1/smaps', f.read())
     result = backend.GetMemoryStats(1)
     self.assertEquals(result, {'PrivateDirty': 5324800,
                                'VM': 1025978368,
                                'VMPeak': 1025978368,
                                'WorkingSetSize': 84000768,
                                'WorkingSetSizePeak': 84000768})