content/browser/power_profiler/power_data_provider_ia_win.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/power_profiler/power_data_provider_ia_win.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/logging.h"
   9
  10 namespace content {
  11
  12 // Default sampling period, as recommended by Intel Power Gadget.
  13 // Section 3.1 of
  14 // http://software.intel.com/en-us/blogs/2013/10/03/using-the-intel-power-gadget-api-on-windows
  15 const int kDefaultSamplePeriodMs = 50;
  16
  17 scoped_ptr<PowerDataProvider> PowerDataProvider::Create() {
  18   scoped_ptr<PowerDataProviderIA> provider(new PowerDataProviderIA());
  19   if (provider->Initialize())
  20     return make_scoped_ptr<PowerDataProvider>(provider.release());
  21
  22   return make_scoped_ptr<PowerDataProvider>(NULL);
  23 }
  24
  25 PowerDataProviderIA::PowerDataProviderIA()
  26     : sockets_number_(0),
  27       is_open_(false) {
  28   for (int i = 0; i < PowerEvent::ID_COUNT; i++ )
  29       power_msr_ids_[i] = -1;
  30 }
  31
  32 PowerDataProviderIA::~PowerDataProviderIA() {
  33 }
  34
  35 PowerEventVector PowerDataProviderIA::GetData() {
  36   PowerEventVector events;
  37
  38   if (!energy_lib_.ReadSample())
  39     return events;
  40
  41   PowerEvent event;
  42   double package_power = 0.0;
  43   double power[3];
  44   int data_count;
  45
  46   for (int i = 0; i < sockets_number_; i++) {
  47     if (power_msr_ids_[PowerEvent::SOC_PACKAGE] == -1)
  48       break;
  49
  50     energy_lib_.GetPowerData(i,
  51         power_msr_ids_[PowerEvent::SOC_PACKAGE], power, &data_count);
  52     package_power += power[0];
  53   }
  54
  55   event.type = PowerEvent::SOC_PACKAGE;
  56   event.value = package_power;
  57   event.time = base::TimeTicks::Now();
  58   events.push_back(event);
  59
  60   return events;
  61 }
  62
  63 base::TimeDelta PowerDataProviderIA::GetSamplingRate() {
  64   return base::TimeDelta::FromMilliseconds(kDefaultSamplePeriodMs);
  65 }
  66
  67 bool PowerDataProviderIA::Initialize() {
  68   if (is_open_)
  69     return true;
  70
  71   if (!energy_lib_.IntelEnergyLibInitialize()) {
  72     LOG(ERROR) << "Power Data Provider initialize failed!";
  73     return false;
  74   }
  75
  76   energy_lib_.GetNumNodes(&sockets_number_);
  77
  78   const std::wstring package_msr_name = L"Processor";
  79
  80   int msr_number;
  81   energy_lib_.GetNumMsrs(&msr_number);
  82
  83   int func_id;
  84   wchar_t name[32];
  85   for(int i = 0; i < msr_number; i++) {
  86     energy_lib_.GetMsrFunc(i, &func_id);
  87     energy_lib_.GetMsrName(i, name);
  88
  89     if (func_id != 1)
  90       continue;
  91
  92     if (package_msr_name.compare(name) == 0)
  93       power_msr_ids_[PowerEvent::SOC_PACKAGE] = i;
  94   }
  95
  96   is_open_ = true;
  97   return true;
  98 }
  99
 100 }  // namespace content