| // Copyright 2019 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 THIRD_PARTY_BLINK_RENDERER_CONTROLLER_MEMORY_USAGE_MONITOR_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CONTROLLER_MEMORY_USAGE_MONITOR_H_ |
| |
| #include "base/observer_list.h" |
| #include "third_party/blink/renderer/controller/controller_export.h" |
| #include "third_party/blink/renderer/platform/timer.h" |
| |
| namespace blink { |
| |
| // nan means data not available. |
| struct MemoryUsage { |
| double v8_bytes = std::numeric_limits<double>::quiet_NaN(); |
| double partition_alloc_bytes = std::numeric_limits<double>::quiet_NaN(); |
| double blink_gc_bytes = std::numeric_limits<double>::quiet_NaN(); |
| double private_footprint_bytes = std::numeric_limits<double>::quiet_NaN(); |
| double swap_bytes = std::numeric_limits<double>::quiet_NaN(); |
| double vm_size_bytes = std::numeric_limits<double>::quiet_NaN(); |
| }; |
| |
| // Periodically checks the memory usage and notifies its observers. Monitoring |
| // automatically starts/stops depending on whether an observer exists. |
| class CONTROLLER_EXPORT MemoryUsageMonitor { |
| public: |
| static MemoryUsageMonitor& Instance(); |
| |
| class Observer : public base::CheckedObserver { |
| public: |
| virtual void OnMemoryPing(MemoryUsage) = 0; |
| }; |
| |
| MemoryUsageMonitor(); |
| virtual ~MemoryUsageMonitor() = default; |
| |
| // Returns the current memory usage. |
| virtual MemoryUsage GetCurrentMemoryUsage(); |
| |
| // Ensures that an observer is only added once. |
| void AddObserver(Observer*); |
| // Observers must be removed before they are destroyed. |
| void RemoveObserver(Observer*); |
| bool HasObserver(Observer*); |
| |
| bool TimerIsActive() const { return timer_.IsActive(); } |
| |
| protected: |
| // Adds V8 related memory usage data to the given struct. |
| void GetV8MemoryUsage(MemoryUsage&); |
| // Adds Blink related memory usage data to the given struct. |
| void GetBlinkMemoryUsage(MemoryUsage&); |
| // Adds process related memory usage data to the given struct. |
| virtual void GetProcessMemoryUsage(MemoryUsage&) {} |
| |
| private: |
| virtual void StartMonitoringIfNeeded(); |
| virtual void StopMonitoring(); |
| |
| void TimerFired(TimerBase*); |
| |
| TaskRunnerTimer<MemoryUsageMonitor> timer_; |
| base::ObserverList<Observer> observers_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CONTROLLER_MEMORY_USAGE_MONITOR_H_ |