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 got from |
+// PowerDataCollector::system_resumed_data. |
+class CpuDataCollector { |
+ public: |
+ struct StateOccupancySample { |
+ StateOccupancySample(); |
+ |
+ // The time when the data was sampled. |
+ base::Time time; |
+ |
+ // Indicates whether the CPU is online. |
+ bool cpu_online; |
+ |
+ // A mapping from CPU state name to time spent in that state in |
+ // milliseconds. |
+ std::map<std::string, int64> state_occupancy; |
+ }; |
+ |
+ typedef std::deque<StateOccupancySample> StateOccupancySampleDeque; |
+ |
+ const std::vector<StateOccupancySampleDeque>& cpu_idle_state_data() const { |
+ return cpu_idle_state_data_; |
+ } |
+ |
+ const std::vector<StateOccupancySampleDeque>& cpu_freq_state_data() const { |
+ return cpu_freq_state_data_; |
+ } |
+ |
+ CpuDataCollector(); |
+ |
+ void Start(); |
+ |
+ private: |
+ void PostSampleCpuState(); |
+ |
+ // Samples CPU idle and CPU freq data from sysfs. This function should run on |
+ // the blocking pool as reading from sysfs is a blocking task. Elements at |
+ // index i in |idle_samples| and |freq_samples| correspond to the idle and |
+ // freq samples of CPU i. |
+ void SampleCpuStateOnBlockingPool( |
+ std::vector<StateOccupancySample>* idle_samples, |
+ std::vector<StateOccupancySample>* freq_samples); |
+ |
+ // This function commits the 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 std::vector<StateOccupancySample>* idle_samples, |
+ const std::vector<StateOccupancySample>* freq_samples); |
+ |
+ base::RepeatingTimer<CpuDataCollector> timer_; |
+ |
+ // 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_; |
+ |
+ // 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. |
+ 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_ |