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 101
