Index: chrome/browser/chromeos/power/cpu_data_collector.h |
diff --git a/chrome/browser/chromeos/power/cpu_data_collector.h b/chrome/browser/chromeos/power/cpu_data_collector.h |
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+// Copyright 2014 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. |
+ |
+#ifndef CHROME_BROWSER_CHROMEOS_POWER_CPU_DATA_COLLECTOR_H_ |
+#define CHROME_BROWSER_CHROMEOS_POWER_CPU_DATA_COLLECTOR_H_ |
+ |
+#include <deque> |
+#include <map> |
+#include <string> |
+#include <vector> |
+ |
+#include "base/basictypes.h" |
+#include "base/memory/weak_ptr.h" |
+#include "base/time/time.h" |
+#include "base/timer/timer.h" |
+ |
+namespace chromeos { |
+ |
+// A class to sample CPU idle state occupancy and freq state occupancy. |
+// Collects raw data from sysfs and does not convert it to percentage |
+// occupancy. As CPUs can be offline at times, or the system can be suspended at |
+// other times, it is best for the consumer of this data to calculate percentage |
+// occupancy information using suspend time data from |
+// PowerDataCollector::system_resumed_data. |
+class CpuDataCollector { |
+ public: |
+ struct StateOccupancySample { |
+ StateOccupancySample(); |
+ ~StateOccupancySample(); |
+ |
+ // The time when the data was sampled. |
+ base::Time time; |
+ |
+ // Indicates whether the CPU is online. |
+ bool cpu_online; |
+ |
+ // A mapping from a CPU state to time spent in that state in milliseconds. |
+ // For idle state samples, the name of the state at index i in this vector |
+ // is the name at index i in the vector returned by cpu_idle_state_names(). |
+ // Similarly, for freq state occupancy, similar information is in the vector |
+ // returned by cpu_freq_state_names(). |
+ std::vector<int64> time_in_state; |
+ }; |
+ |
+ typedef std::deque<StateOccupancySample> StateOccupancySampleDeque; |
+ |
+ const std::vector<std::string>& cpu_idle_state_names() const { |
+ return cpu_idle_state_names_; |
+ } |
+ |
+ const std::vector<StateOccupancySampleDeque>& cpu_idle_state_data() const { |
+ return cpu_idle_state_data_; |
+ } |
+ |
+ const std::vector<std::string>& cpu_freq_state_names() const { |
+ return cpu_freq_state_names_; |
+ } |
+ |
+ const std::vector<StateOccupancySampleDeque>& cpu_freq_state_data() const { |
+ return cpu_freq_state_data_; |
+ } |
+ |
+ CpuDataCollector(); |
+ ~CpuDataCollector(); |
+ |
+ // Starts a repeating timer which periodically runs a callback to collect |
+ // CPU state occupancy samples. |
+ void Start(); |
+ |
+ private: |
+ // Posts callbacks to the blocking pool which collect CPU state occupancy |
+ // samples from the sysfs. |
+ void PostSampleCpuState(); |
+ |
+ // This function commits the CPU count and samples read by |
+ // SampleCpuStateOnBlockingPool to |cpu_idle_state_data_| and |
+ // |cpu_freq_state_data_|. Since UI is the consumer of CPU idle and freq data, |
+ // this function should run on the UI thread. |
+ void SaveCpuStateSamplesOnUIThread( |
+ const int* cpu_count, |
+ const std::vector<std::string>* cpu_idle_state_names, |
+ const std::vector<StateOccupancySample>* idle_samples, |
+ const std::vector<std::string>* cpu_freq_state_names, |
+ const std::vector<StateOccupancySample>* freq_samples); |
+ |
+ base::RepeatingTimer<CpuDataCollector> timer_; |
+ |
+ // Names of the idle states. |
+ std::vector<std::string> cpu_idle_state_names_; |
+ |
+ // The deque at index <i> in the vector corresponds to the idle state |
+ // occupancy data of CPU<i>. |
+ std::vector<StateOccupancySampleDeque> cpu_idle_state_data_; |
+ |
+ // Names of the freq states. |
+ std::vector<std::string> cpu_freq_state_names_; |
+ |
+ // The deque at index <i> in the vector corresponds to the frequency state |
+ // occupancy data of CPU<i>. |
+ std::vector<StateOccupancySampleDeque> cpu_freq_state_data_; |
+ |
+ // The number of CPUs on the system. This value is read from the sysfs, and |
+ // hence should be read/written to only from the blocking pool. |
+ int cpu_count_; |
+ |
+ base::WeakPtrFactory<CpuDataCollector> weak_ptr_factory_; |
+ DISALLOW_COPY_AND_ASSIGN(CpuDataCollector); |
+}; |
+ |
+} // namespace chromeos |
+ |
+#endif // CHROME_BROWSER_CHROMEOS_POWER_CPU_DATA_COLLECTOR_H_ |