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| 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 #ifndef CHROME_BROWSER_CHROMEOS_POWER_CPU_DATA_COLLECTOR_H_ |
| 6 #define CHROME_BROWSER_CHROMEOS_POWER_CPU_DATA_COLLECTOR_H_ |
| 7 |
| 8 #include <deque> |
| 9 #include <map> |
| 10 #include <string> |
| 11 #include <vector> |
| 12 |
| 13 #include "base/basictypes.h" |
| 14 #include "base/memory/weak_ptr.h" |
| 15 #include "base/time/time.h" |
| 16 #include "base/timer/timer.h" |
| 17 |
| 18 namespace chromeos { |
| 19 |
| 20 // A class to sample CPU idle state occupancy and freq state occupancy. |
| 21 // Collects raw data from sysfs and does not convert it to percentage |
| 22 // occupancy. As CPUs can be offline at times, or the system can be suspended at |
| 23 // other times, it is best for the consumer of this data to calculate percentage |
| 24 // occupancy information using suspend time data from |
| 25 // PowerDataCollector::system_resumed_data. |
| 26 class CpuDataCollector { |
| 27 public: |
| 28 struct StateOccupancySample { |
| 29 StateOccupancySample(); |
| 30 ~StateOccupancySample(); |
| 31 |
| 32 // The time when the data was sampled. |
| 33 base::Time time; |
| 34 |
| 35 // Indicates whether the CPU is online. |
| 36 bool cpu_online; |
| 37 |
| 38 // A mapping from a CPU state to time spent in that state in milliseconds. |
| 39 // For idle state samples, the name of the state at index i in this vector |
| 40 // is the name at index i in the vector returned by cpu_idle_state_names(). |
| 41 // Similarly, for freq state occupancy, similar information is in the vector |
| 42 // returned by cpu_freq_state_names(). |
| 43 std::vector<int64> time_in_state; |
| 44 }; |
| 45 |
| 46 typedef std::deque<StateOccupancySample> StateOccupancySampleDeque; |
| 47 |
| 48 const std::vector<std::string>& cpu_idle_state_names() const { |
| 49 return cpu_idle_state_names_; |
| 50 } |
| 51 |
| 52 const std::vector<StateOccupancySampleDeque>& cpu_idle_state_data() const { |
| 53 return cpu_idle_state_data_; |
| 54 } |
| 55 |
| 56 const std::vector<std::string>& cpu_freq_state_names() const { |
| 57 return cpu_freq_state_names_; |
| 58 } |
| 59 |
| 60 const std::vector<StateOccupancySampleDeque>& cpu_freq_state_data() const { |
| 61 return cpu_freq_state_data_; |
| 62 } |
| 63 |
| 64 CpuDataCollector(); |
| 65 ~CpuDataCollector(); |
| 66 |
| 67 // Starts a repeating timer which periodically runs a callback to collect |
| 68 // CPU state occupancy samples. |
| 69 void Start(); |
| 70 |
| 71 private: |
| 72 // Posts callbacks to the blocking pool which collect CPU state occupancy |
| 73 // samples from the sysfs. |
| 74 void PostSampleCpuState(); |
| 75 |
| 76 // Samples CPU idle and CPU freq data from sysfs. This function should run on |
| 77 // the blocking pool as reading from sysfs is a blocking task. Elements at |
| 78 // index i in |idle_samples| and |freq_samples| correspond to the idle and |
| 79 // freq samples of CPU i. |
| 80 void SampleCpuStateOnBlockingPool( |
| 81 std::vector<std::string>* cpu_idle_state_names, |
| 82 std::vector<StateOccupancySample>* idle_samples, |
| 83 std::vector<std::string>* cpu_freq_state_names, |
| 84 std::vector<StateOccupancySample>* freq_samples); |
| 85 |
| 86 // This function commits the samples read by SampleCpuStateOnBlockingPool to |
| 87 // |cpu_idle_state_data_| and |cpu_freq_state_data_|. Since UI is the consumer |
| 88 // of CPU idle and freq data, this function should run on the UI thread. |
| 89 void SaveCpuStateSamplesOnUIThread( |
| 90 const std::vector<std::string>* cpu_idle_state_names, |
| 91 const std::vector<StateOccupancySample>* idle_samples, |
| 92 const std::vector<std::string>* cpu_freq_state_names, |
| 93 const std::vector<StateOccupancySample>* freq_samples); |
| 94 |
| 95 base::RepeatingTimer<CpuDataCollector> timer_; |
| 96 |
| 97 // Names of the idle states. |
| 98 std::vector<std::string> cpu_idle_state_names_; |
| 99 |
| 100 // The deque at index <i> in the vector corresponds to the idle state |
| 101 // occupancy data of CPU<i>. |
| 102 std::vector<StateOccupancySampleDeque> cpu_idle_state_data_; |
| 103 |
| 104 // Names of the freq states. |
| 105 std::vector<std::string> cpu_freq_state_names_; |
| 106 |
| 107 // The deque at index <i> in the vector corresponds to the frequency state |
| 108 // occupancy data of CPU<i>. |
| 109 std::vector<StateOccupancySampleDeque> cpu_freq_state_data_; |
| 110 |
| 111 // The number of CPUs on the system. This value is read from the sysfs, and |
| 112 // hence should be read/written to only from the blocking pool. |
| 113 int cpu_count_; |
| 114 |
| 115 base::WeakPtrFactory<CpuDataCollector> weak_ptr_factory_; |
| 116 DISALLOW_COPY_AND_ASSIGN(CpuDataCollector); |
| 117 }; |
| 118 |
| 119 } // namespace chromeos |
| 120 |
| 121 #endif // CHROME_BROWSER_CHROMEOS_POWER_CPU_DATA_COLLECTOR_H_ |
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