| // 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. |
| |
| #include "athena/resource_manager/public/resource_manager.h" |
| |
| #include <algorithm> |
| #include <vector> |
| |
| #include "athena/activity/public/activity.h" |
| #include "athena/activity/public/activity_manager.h" |
| #include "athena/activity/public/activity_manager_observer.h" |
| #include "athena/resource_manager/memory_pressure_notifier.h" |
| #include "athena/resource_manager/public/resource_manager_delegate.h" |
| #include "athena/wm/public/window_list_provider.h" |
| #include "athena/wm/public/window_list_provider_observer.h" |
| #include "athena/wm/public/window_manager.h" |
| #include "athena/wm/public/window_manager_observer.h" |
| #include "base/containers/adapters.h" |
| #include "base/logging.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/time/time.h" |
| #include "ui/aura/window.h" |
| |
| namespace athena { |
| namespace { |
| |
| class ResourceManagerImpl : public ResourceManager, |
| public WindowManagerObserver, |
| public ActivityManagerObserver, |
| public MemoryPressureObserver, |
| public WindowListProviderObserver { |
| public: |
| ResourceManagerImpl(ResourceManagerDelegate* delegate); |
| ~ResourceManagerImpl() override; |
| |
| // ResourceManager: |
| virtual void SetMemoryPressureAndStopMonitoring( |
| MemoryPressure pressure) override; |
| virtual void SetWaitTimeBetweenResourceManageCalls(int time_in_ms) override { |
| wait_time_for_resource_deallocation_ = |
| base::TimeDelta::FromMilliseconds(time_in_ms); |
| // Reset the timeout to force the next resource call to execute immediately. |
| next_resource_management_time_ = base::Time::Now(); |
| } |
| |
| virtual void Pause(bool pause) override { |
| if (pause) { |
| if (!pause_) |
| queued_command_ = false; |
| ++pause_; |
| } else { |
| DCHECK(pause_); |
| --pause_; |
| if (!pause && queued_command_) |
| ManageResource(); |
| } |
| } |
| |
| // ActivityManagerObserver: |
| virtual void OnActivityStarted(Activity* activity) override; |
| virtual void OnActivityEnding(Activity* activity) override; |
| virtual void OnActivityOrderChanged() override; |
| |
| // WindowManagerObserver: |
| virtual void OnOverviewModeEnter() override; |
| virtual void OnOverviewModeExit() override; |
| virtual void OnSplitViewModeEnter() override; |
| virtual void OnSplitViewModeExit() override; |
| |
| // MemoryPressureObserver: |
| virtual void OnMemoryPressure(MemoryPressure pressure) override; |
| virtual ResourceManagerDelegate* GetDelegate() override; |
| |
| // WindowListProviderObserver: |
| virtual void OnWindowStackingChangedInList() override; |
| virtual void OnWindowAddedToList(aura::Window* added_window) override {} |
| virtual void OnWindowRemovedFromList(aura::Window* removed_window, |
| int index) override {} |
| |
| private: |
| // Manage the resources for our activities. |
| void ManageResource(); |
| |
| // Check that the visibility of activities is properly set. |
| void UpdateVisibilityStates(); |
| |
| // Check if activities can be unloaded to reduce memory pressure. |
| void TryToUnloadAnActivity(); |
| |
| // Resources were released and a quiet period is needed before we release |
| // more since it takes a while to trickle through the system. |
| void OnResourcesReleased(); |
| |
| // The memory pressure has increased, previously applied measures did not show |
| // effect and immediate action is required. |
| void OnMemoryPressureIncreased(); |
| |
| // Returns true when the previous memory release was long enough ago to try |
| // unloading another activity. |
| bool AllowedToUnloadActivity(); |
| |
| // The resource manager delegate. |
| scoped_ptr<ResourceManagerDelegate> delegate_; |
| |
| // Keeping a reference to the current memory pressure. |
| MemoryPressure current_memory_pressure_; |
| |
| // The memory pressure notifier. |
| scoped_ptr<MemoryPressureNotifier> memory_pressure_notifier_; |
| |
| // A ref counter. As long as not 0, the management is on hold. |
| int pause_; |
| |
| // If true, a command came in while the resource manager was paused. |
| bool queued_command_; |
| |
| // Used by ManageResource() to determine an activity state change while it |
| // changes Activity properties. |
| bool activity_order_changed_; |
| |
| // True if in overview mode - activity order changes will be ignored if true |
| // and postponed till after the overview mode is ending. |
| bool in_overview_mode_; |
| |
| // True if we are in split view mode. |
| bool in_split_view_mode_; |
| |
| // The last time the resource manager was called to release resources. |
| // Avoid too aggressive resource de-allocation by enforcing a wait time of |
| // |wait_time_for_resource_deallocation_| between executed calls. |
| base::Time next_resource_management_time_; |
| |
| // The wait time between two resource managing executions. |
| base::TimeDelta wait_time_for_resource_deallocation_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ResourceManagerImpl); |
| }; |
| |
| namespace { |
| ResourceManagerImpl* instance = nullptr; |
| |
| // We allow this many activities to be visible. All others must be at state of |
| // invisible or below. |
| const int kMaxVisibleActivities = 3; |
| |
| } // namespace |
| |
| ResourceManagerImpl::ResourceManagerImpl(ResourceManagerDelegate* delegate) |
| : delegate_(delegate), |
| current_memory_pressure_(MEMORY_PRESSURE_UNKNOWN), |
| memory_pressure_notifier_(new MemoryPressureNotifier(this)), |
| pause_(false), |
| queued_command_(false), |
| activity_order_changed_(false), |
| in_overview_mode_(false), |
| in_split_view_mode_(false), |
| next_resource_management_time_(base::Time::Now()), |
| wait_time_for_resource_deallocation_(base::TimeDelta::FromMilliseconds( |
| delegate_->MemoryPressureIntervalInMS())) { |
| WindowManager::Get()->AddObserver(this); |
| WindowManager::Get()->GetWindowListProvider()->AddObserver(this); |
| ActivityManager::Get()->AddObserver(this); |
| } |
| |
| ResourceManagerImpl::~ResourceManagerImpl() { |
| ActivityManager::Get()->RemoveObserver(this); |
| WindowManager::Get()->GetWindowListProvider()->RemoveObserver(this); |
| WindowManager::Get()->RemoveObserver(this); |
| } |
| |
| void ResourceManagerImpl::SetMemoryPressureAndStopMonitoring( |
| MemoryPressure pressure) { |
| memory_pressure_notifier_->StopObserving(); |
| OnMemoryPressure(pressure); |
| } |
| |
| void ResourceManagerImpl::OnActivityStarted(Activity* activity) { |
| // Update the activity states. |
| ManageResource(); |
| activity_order_changed_ = true; |
| } |
| |
| void ResourceManagerImpl::OnActivityEnding(Activity* activity) { |
| activity_order_changed_ = true; |
| } |
| |
| void ResourceManagerImpl::OnActivityOrderChanged() { |
| activity_order_changed_ = true; |
| } |
| |
| void ResourceManagerImpl::OnOverviewModeEnter() { |
| in_overview_mode_ = true; |
| } |
| |
| void ResourceManagerImpl::OnOverviewModeExit() { |
| in_overview_mode_ = false; |
| ManageResource(); |
| } |
| |
| void ResourceManagerImpl::OnSplitViewModeEnter() { |
| // Re-apply the memory pressure to make sure enough items are visible. |
| in_split_view_mode_ = true; |
| ManageResource(); |
| } |
| |
| |
| void ResourceManagerImpl::OnSplitViewModeExit() { |
| // We don't do immediately something yet. The next ManageResource call will |
| // come soon. |
| in_split_view_mode_ = false; |
| } |
| |
| void ResourceManagerImpl::OnWindowStackingChangedInList() { |
| if (pause_) { |
| queued_command_ = true; |
| return; |
| } |
| |
| // No need to do anything while being in overview mode. |
| if (in_overview_mode_) |
| return; |
| |
| // Manage the resources of each activity. |
| ManageResource(); |
| } |
| |
| void ResourceManagerImpl::OnMemoryPressure(MemoryPressure pressure) { |
| if (pressure > current_memory_pressure_) |
| OnMemoryPressureIncreased(); |
| current_memory_pressure_ = pressure; |
| ManageResource(); |
| } |
| |
| ResourceManagerDelegate* ResourceManagerImpl::GetDelegate() { |
| return delegate_.get(); |
| } |
| |
| void ResourceManagerImpl::ManageResource() { |
| // If there is none or only one app running we cannot do anything. |
| if (ActivityManager::Get()->GetActivityList().size() <= 1U) |
| return; |
| |
| if (pause_) { |
| queued_command_ = true; |
| return; |
| } |
| |
| // Check that the visibility of items is properly set. Note that this might |
| // already trigger a release of resources. If this happens, |
| // AllowedToUnloadActivity() will return false. |
| UpdateVisibilityStates(); |
| |
| // Since resource deallocation takes time, we avoid to release more resources |
| // in short succession. Note that we come here periodically and if one call |
| // is not triggering an unload, the next one will. |
| if (AllowedToUnloadActivity()) |
| TryToUnloadAnActivity(); |
| } |
| |
| void ResourceManagerImpl::UpdateVisibilityStates() { |
| // The first n activities should be treated as "visible", means they updated |
| // in overview mode and will keep their layer resources for faster switch |
| // times. Usually we use |kMaxVisibleActivities| items, but when the memory |
| // pressure gets critical we only hold as many as are really visible. |
| size_t max_activities = kMaxVisibleActivities; |
| if (current_memory_pressure_ == MEMORY_PRESSURE_CRITICAL) |
| max_activities = in_split_view_mode_ ? 2 : 1; |
| |
| do { |
| activity_order_changed_ = false; |
| |
| // Change the visibility of our activities in a pre-processing step. This is |
| // required since it might change the order/number of activities. |
| // Note: We cannot use the order of items in the ActivityManager since it |
| // does not follow the order of windows. |
| size_t count = 0; |
| const aura::Window::Windows& windows = |
| WindowManager::Get()->GetWindowListProvider()->GetWindowList(); |
| for (aura::Window::Windows::const_reverse_iterator it = windows.rbegin(); |
| it != windows.rend(); it++) { |
| Activity* activity = ActivityManager::Get()->GetActivityForWindow(*it); |
| // It is possible that the window was not yet added to the ActivityManager |
| // in which case we are not interested in managing it yet. |
| if (!activity) |
| continue; |
| Activity::ActivityState state = activity->GetCurrentState(); |
| |
| // The first |kMaxVisibleActivities| entries should be visible, all others |
| // invisible or at a lower activity state. |
| if (count < max_activities || |
| (state == Activity::ACTIVITY_INVISIBLE || |
| state == Activity::ACTIVITY_VISIBLE)) { |
| Activity::ActivityState visiblity_state = |
| count < max_activities ? Activity::ACTIVITY_VISIBLE : |
| Activity::ACTIVITY_INVISIBLE; |
| // Only change the state when it changes. Note that when the memory |
| // pressure is critical, only the primary activities (1 or 2) are made |
| // visible. Furthermore, in relaxed mode we only want to turn visible, |
| // never invisible. |
| if (visiblity_state != state && |
| (current_memory_pressure_ != MEMORY_PRESSURE_LOW || |
| visiblity_state == Activity::ACTIVITY_VISIBLE)) { |
| activity->SetCurrentState(visiblity_state); |
| // If we turned an activity invisible, we are already releasing memory |
| // and can hold off releasing more for now. |
| if (visiblity_state == Activity::ACTIVITY_INVISIBLE) |
| OnResourcesReleased(); |
| } |
| } |
| |
| // See which count we should handle next. |
| if (activity_order_changed_) |
| break; |
| ++count; |
| } |
| // If we stopped iterating over the list of activities because of the change |
| // in ordering, then restart processing the activities from the beginning. |
| } while (activity_order_changed_); |
| } |
| |
| void ResourceManagerImpl::TryToUnloadAnActivity() { |
| // TODO(skuhne): This algorithm needs to take all kinds of predictive analysis |
| // and running applications into account. For this first patch we only do a |
| // very simple "floating window" algorithm which is surely not good enough. |
| size_t max_running_activities = 5; |
| switch (current_memory_pressure_) { |
| case MEMORY_PRESSURE_UNKNOWN: |
| // If we do not know how much memory we have we assume that it must be a |
| // high consumption. |
| // Fallthrough. |
| case MEMORY_PRESSURE_HIGH: |
| max_running_activities = 5; |
| break; |
| case MEMORY_PRESSURE_CRITICAL: |
| max_running_activities = 0; |
| break; |
| case MEMORY_PRESSURE_MODERATE: |
| max_running_activities = 7; |
| break; |
| case MEMORY_PRESSURE_LOW: |
| NOTREACHED(); |
| return; |
| } |
| |
| // Check if / which activity we want to unload. |
| Activity* oldest_media_activity = nullptr; |
| Activity* oldest_unloadable_activity = nullptr; |
| size_t unloadable_activity_count = 0; |
| const ActivityList& activity_list = ActivityManager::Get()->GetActivityList(); |
| for (Activity* activity : activity_list) { |
| Activity::ActivityState state = activity->GetCurrentState(); |
| // The activity should neither be unloaded nor visible. |
| if (state != Activity::ACTIVITY_UNLOADED && |
| state != Activity::ACTIVITY_VISIBLE) { |
| if (activity->GetMediaState() == Activity::ACTIVITY_MEDIA_STATE_NONE) { |
| // Does not play media - so we can unload this immediately. |
| ++unloadable_activity_count; |
| oldest_unloadable_activity = activity; |
| } else { |
| oldest_media_activity = activity; |
| } |
| } |
| } |
| |
| if (unloadable_activity_count > max_running_activities) { |
| CHECK(oldest_unloadable_activity); |
| OnResourcesReleased(); |
| oldest_unloadable_activity->SetCurrentState(Activity::ACTIVITY_UNLOADED); |
| return; |
| } else if (current_memory_pressure_ == MEMORY_PRESSURE_CRITICAL) { |
| if (oldest_media_activity) { |
| OnResourcesReleased(); |
| oldest_media_activity->SetCurrentState(Activity::ACTIVITY_UNLOADED); |
| LOG(WARNING) << "Unloading item to releave critical memory pressure"; |
| return; |
| } |
| LOG(ERROR) << "[ResourceManager]: Single activity uses too much memory."; |
| return; |
| } |
| |
| if (current_memory_pressure_ != MEMORY_PRESSURE_UNKNOWN) { |
| // Only show this warning when the memory pressure is actually known. This |
| // will suppress warnings in e.g. unit tests. |
| LOG(WARNING) << "[ResourceManager]: No way to release memory pressure (" << |
| current_memory_pressure_ << |
| "), Activities (running, allowed, unloadable)=(" << |
| activity_list.size() << ", " << |
| max_running_activities << ", " << |
| unloadable_activity_count << ")"; |
| } |
| } |
| |
| void ResourceManagerImpl::OnResourcesReleased() { |
| // Do not release too many activities in short succession since it takes time |
| // to release resources. As such wait the memory pressure interval before the |
| // next call. |
| next_resource_management_time_ = base::Time::Now() + |
| wait_time_for_resource_deallocation_; |
| } |
| |
| void ResourceManagerImpl::OnMemoryPressureIncreased() { |
| // By setting the timer to Now, the next call will immediately be performed. |
| next_resource_management_time_ = base::Time::Now(); |
| } |
| |
| bool ResourceManagerImpl::AllowedToUnloadActivity() { |
| return current_memory_pressure_ != MEMORY_PRESSURE_LOW && |
| base::Time::Now() >= next_resource_management_time_; |
| } |
| |
| } // namespace |
| |
| // static |
| void ResourceManager::Create() { |
| DCHECK(!instance); |
| instance = new ResourceManagerImpl( |
| ResourceManagerDelegate::CreateResourceManagerDelegate()); |
| } |
| |
| // static |
| ResourceManager* ResourceManager::Get() { |
| return instance; |
| } |
| |
| // static |
| void ResourceManager::Shutdown() { |
| DCHECK(instance); |
| delete instance; |
| instance = nullptr; |
| } |
| |
| ResourceManager::ResourceManager() {} |
| |
| ResourceManager::~ResourceManager() { |
| DCHECK(instance); |
| instance = nullptr; |
| } |
| |
| } // namespace athena |