| // Copyright 2015 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 COMPONENTS_MEMORY_PRESSURE_DIRECT_MEMORY_PRESSURE_CALCULATOR_WIN_H_ |
| #define COMPONENTS_MEMORY_PRESSURE_DIRECT_MEMORY_PRESSURE_CALCULATOR_WIN_H_ |
| |
| #include "components/memory_pressure/memory_pressure_calculator.h" |
| |
| #include "base/macros.h" |
| #include "base/process/process_metrics.h" |
| #include "build/build_config.h" |
| |
| namespace memory_pressure { |
| |
| #if defined(MEMORY_PRESSURE_IS_POLLING) |
| |
| // OS-specific implementation of MemoryPressureCalculator. This is only defined |
| // and used on platforms that do not have native memory pressure signals |
| // (ChromeOS, Linux, Windows). OSes that do have native signals simply hook into |
| // the appropriate subsystem (Android, Mac OS X). |
| class DirectMemoryPressureCalculator : public MemoryPressureCalculator { |
| public: |
| // Exposed for unittesting. See .cc file for detailed discussion of these |
| // constants. |
| static const int kLargeMemoryThresholdMb; |
| static const int kSmallMemoryDefaultModerateThresholdMb; |
| static const int kSmallMemoryDefaultCriticalThresholdMb; |
| static const int kLargeMemoryDefaultModerateThresholdMb; |
| static const int kLargeMemoryDefaultCriticalThresholdMb; |
| |
| // Default constructor. Will choose thresholds automatically based on the |
| // actual amount of system memory installed. |
| DirectMemoryPressureCalculator(); |
| |
| // Constructor with explicit memory thresholds. These represent the amount of |
| // free memory below which the applicable memory pressure state applies. |
| DirectMemoryPressureCalculator(int moderate_threshold_mb, |
| int critical_threshold_mb); |
| |
| ~DirectMemoryPressureCalculator() override {} |
| |
| // Calculates the current pressure level. |
| MemoryPressureLevel CalculateCurrentPressureLevel() override; |
| |
| int moderate_threshold_mb() const { return moderate_threshold_mb_; } |
| int critical_threshold_mb() const { return critical_threshold_mb_; } |
| |
| private: |
| friend class TestDirectMemoryPressureCalculator; |
| |
| // Gets system memory status. This is virtual as a unittesting hook and by |
| // default this invokes base::GetSystemMemoryInfo. |
| virtual bool GetSystemMemoryInfo(base::SystemMemoryInfoKB* mem_info) const; |
| |
| // Uses GetSystemMemoryInfo to automatically infer appropriate values for |
| // moderate_threshold_mb_ and critical_threshold_mb_. |
| void InferThresholds(); |
| |
| // Threshold amounts of available memory that trigger pressure levels. See |
| // memory_pressure_monitor_win.cc for a discussion of reasonable values for |
| // these. |
| int moderate_threshold_mb_; |
| int critical_threshold_mb_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DirectMemoryPressureCalculator); |
| }; |
| |
| #endif // defined(MEMORY_PRESSURE_IS_POLLING) |
| |
| } // namespace memory_pressure |
| |
| #endif // COMPONENTS_MEMORY_PRESSURE_DIRECT_MEMORY_PRESSURE_CALCULATOR_WIN_H_ |