| // Copyright 2017 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. |
| |
| #include "components/viz/client/frame_eviction_manager.h" |
| |
| #include <algorithm> |
| |
| #include "base/bind.h" |
| #include "base/logging.h" |
| #include "base/memory/memory_pressure_listener.h" |
| #include "base/memory/memory_pressure_monitor.h" |
| #include "base/memory/shared_memory.h" |
| #include "base/stl_util.h" |
| #include "base/system/sys_info.h" |
| #include "build/build_config.h" |
| |
| namespace viz { |
| namespace { |
| |
| const int kModeratePressurePercentage = 50; |
| const int kCriticalPressurePercentage = 10; |
| |
| } // namespace |
| |
| FrameEvictionManager* FrameEvictionManager::GetInstance() { |
| return base::Singleton<FrameEvictionManager>::get(); |
| } |
| |
| FrameEvictionManager::~FrameEvictionManager() {} |
| |
| void FrameEvictionManager::AddFrame(FrameEvictionManagerClient* frame, |
| bool locked) { |
| RemoveFrame(frame); |
| if (locked) |
| locked_frames_[frame] = 1; |
| else |
| unlocked_frames_.push_front(frame); |
| CullUnlockedFrames(GetMaxNumberOfSavedFrames()); |
| } |
| |
| void FrameEvictionManager::RemoveFrame(FrameEvictionManagerClient* frame) { |
| auto locked_iter = locked_frames_.find(frame); |
| if (locked_iter != locked_frames_.end()) |
| locked_frames_.erase(locked_iter); |
| unlocked_frames_.remove(frame); |
| } |
| |
| void FrameEvictionManager::LockFrame(FrameEvictionManagerClient* frame) { |
| if (base::ContainsValue(unlocked_frames_, frame)) { |
| DCHECK(locked_frames_.find(frame) == locked_frames_.end()); |
| unlocked_frames_.remove(frame); |
| locked_frames_[frame] = 1; |
| } else { |
| DCHECK(locked_frames_.find(frame) != locked_frames_.end()); |
| locked_frames_[frame]++; |
| } |
| } |
| |
| void FrameEvictionManager::UnlockFrame(FrameEvictionManagerClient* frame) { |
| DCHECK(locked_frames_.find(frame) != locked_frames_.end()); |
| size_t locked_count = locked_frames_[frame]; |
| DCHECK(locked_count); |
| if (locked_count > 1) { |
| locked_frames_[frame]--; |
| } else { |
| RemoveFrame(frame); |
| unlocked_frames_.push_front(frame); |
| CullUnlockedFrames(GetMaxNumberOfSavedFrames()); |
| } |
| } |
| |
| size_t FrameEvictionManager::GetMaxNumberOfSavedFrames() const { |
| int percentage = 100; |
| base::MemoryPressureMonitor* monitor = base::MemoryPressureMonitor::Get(); |
| |
| if (!monitor) |
| return max_number_of_saved_frames_; |
| |
| // Until we have a global OnMemoryPressureChanged event we need to query the |
| // value from our specific pressure monitor. |
| switch (monitor->GetCurrentPressureLevel()) { |
| case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE: |
| percentage = 100; |
| break; |
| case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE: |
| percentage = kModeratePressurePercentage; |
| break; |
| case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL: |
| percentage = kCriticalPressurePercentage; |
| break; |
| } |
| size_t frames = (max_number_of_saved_frames_ * percentage) / 100; |
| return std::max(static_cast<size_t>(1), frames); |
| } |
| |
| FrameEvictionManager::FrameEvictionManager() |
| : memory_pressure_listener_(new base::MemoryPressureListener( |
| base::BindRepeating(&FrameEvictionManager::OnMemoryPressure, |
| base::Unretained(this)))) { |
| max_number_of_saved_frames_ = |
| #if defined(OS_ANDROID) |
| // If the amount of memory on the device is >= 3.5 GB, save up to 5 |
| // frames. |
| base::SysInfo::AmountOfPhysicalMemoryMB() < 1024 * 3.5f ? 1 : 5; |
| #else |
| std::min(5, 2 + (base::SysInfo::AmountOfPhysicalMemoryMB() / 256)); |
| #endif |
| } |
| |
| void FrameEvictionManager::CullUnlockedFrames(size_t saved_frame_limit) { |
| while (!unlocked_frames_.empty() && |
| unlocked_frames_.size() + locked_frames_.size() > saved_frame_limit) { |
| size_t old_size = unlocked_frames_.size(); |
| // Should remove self from list. |
| unlocked_frames_.back()->EvictCurrentFrame(); |
| DCHECK_EQ(unlocked_frames_.size() + 1, old_size); |
| } |
| } |
| |
| void FrameEvictionManager::OnMemoryPressure( |
| base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) { |
| switch (memory_pressure_level) { |
| case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE: |
| PurgeMemory(kModeratePressurePercentage); |
| break; |
| case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL: |
| PurgeMemory(kCriticalPressurePercentage); |
| break; |
| case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE: |
| // No need to change anything when there is no pressure. |
| return; |
| } |
| } |
| |
| void FrameEvictionManager::PurgeMemory(int percentage) { |
| int saved_frame_limit = max_number_of_saved_frames_; |
| if (saved_frame_limit <= 1) |
| return; |
| CullUnlockedFrames(std::max(1, (saved_frame_limit * percentage) / 100)); |
| } |
| |
| void FrameEvictionManager::PurgeAllUnlockedFrames() { |
| CullUnlockedFrames(0); |
| } |
| |
| } // namespace viz |