| // 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 "third_party/blink/renderer/platform/scheduler/main_thread/main_thread_scheduler_impl.h" |
| |
| #include <memory> |
| |
| #include "base/bind.h" |
| #include "base/debug/stack_trace.h" |
| #include "base/feature_list.h" |
| #include "base/logging.h" |
| #include "base/metrics/field_trial_params.h" |
| #include "base/metrics/histogram.h" |
| #include "base/metrics/histogram_functions.h" |
| #include "base/metrics/histogram_macros.h" |
| #include "base/strings/string_number_conversions.h" |
| #include "base/threading/thread_task_runner_handle.h" |
| #include "base/trace_event/trace_event.h" |
| #include "base/trace_event/trace_event_argument.h" |
| #include "build/build_config.h" |
| #include "components/viz/common/frame_sinks/begin_frame_args.h" |
| #include "services/metrics/public/cpp/ukm_builders.h" |
| #include "third_party/blink/public/common/page/launching_process_state.h" |
| #include "third_party/blink/public/platform/platform.h" |
| #include "third_party/blink/public/platform/scheduler/renderer_process_type.h" |
| #include "third_party/blink/renderer/platform/instrumentation/resource_coordinator/blink_resource_coordinator_base.h" |
| #include "third_party/blink/renderer/platform/instrumentation/resource_coordinator/renderer_resource_coordinator.h" |
| #include "third_party/blink/renderer/platform/runtime_enabled_features.h" |
| #include "third_party/blink/renderer/platform/scheduler/base/real_time_domain.h" |
| #include "third_party/blink/renderer/platform/scheduler/base/task_queue_impl.h" |
| #include "third_party/blink/renderer/platform/scheduler/base/task_queue_selector.h" |
| #include "third_party/blink/renderer/platform/scheduler/base/virtual_time_domain.h" |
| #include "third_party/blink/renderer/platform/scheduler/child/features.h" |
| #include "third_party/blink/renderer/platform/scheduler/child/process_state.h" |
| #include "third_party/blink/renderer/platform/scheduler/common/throttling/task_queue_throttler.h" |
| #include "third_party/blink/renderer/platform/scheduler/main_thread/auto_advancing_virtual_time_domain.h" |
| #include "third_party/blink/renderer/platform/scheduler/main_thread/page_scheduler_impl.h" |
| #include "third_party/blink/renderer/platform/scheduler/renderer/webthread_impl_for_renderer_scheduler.h" |
| |
| namespace blink { |
| namespace scheduler { |
| namespace { |
| // The run time of loading tasks is strongly bimodal. The vast majority are |
| // very cheap, but there are usually a handful of very expensive tasks (e.g ~1 |
| // second on a mobile device) so we take a very pessimistic view when estimating |
| // the cost of loading tasks. |
| const int kLoadingTaskEstimationSampleCount = 1000; |
| const double kLoadingTaskEstimationPercentile = 99; |
| const int kTimerTaskEstimationSampleCount = 1000; |
| const double kTimerTaskEstimationPercentile = 99; |
| const int kShortIdlePeriodDurationSampleCount = 10; |
| const double kShortIdlePeriodDurationPercentile = 50; |
| // Amount of idle time left in a frame (as a ratio of the vsync interval) above |
| // which main thread compositing can be considered fast. |
| const double kFastCompositingIdleTimeThreshold = .2; |
| constexpr base::TimeDelta kQueueingTimeWindowDuration = |
| base::TimeDelta::FromSeconds(1); |
| const double kSamplingRateForTaskUkm = 0.0001; |
| |
| // Field trial name. |
| const char kWakeUpThrottlingTrial[] = "RendererSchedulerWakeUpThrottling"; |
| const char kWakeUpDurationParam[] = "wake_up_duration_ms"; |
| |
| constexpr base::TimeDelta kDefaultWakeUpDuration = base::TimeDelta(); |
| |
| base::TimeDelta GetWakeUpDuration() { |
| int duration_ms; |
| if (!base::StringToInt(base::GetFieldTrialParamValue(kWakeUpThrottlingTrial, |
| kWakeUpDurationParam), |
| &duration_ms)) |
| return kDefaultWakeUpDuration; |
| return base::TimeDelta::FromMilliseconds(duration_ms); |
| } |
| |
| const char* BackgroundStateToString(bool is_backgrounded) { |
| if (is_backgrounded) { |
| return "renderer_backgrounded"; |
| } else { |
| return "renderer_visible"; |
| } |
| } |
| |
| const char* HiddenStateToString(bool is_hidden) { |
| if (is_hidden) { |
| return "hidden"; |
| } else { |
| return "visible"; |
| } |
| } |
| |
| const char* AudioPlayingStateToString(bool is_audio_playing) { |
| if (is_audio_playing) { |
| return "playing"; |
| } else { |
| return "silent"; |
| } |
| } |
| |
| const char* RendererProcessTypeToString(RendererProcessType process_type) { |
| switch (process_type) { |
| case RendererProcessType::kRenderer: |
| return "normal"; |
| case RendererProcessType::kExtensionRenderer: |
| return "extension"; |
| } |
| NOTREACHED(); |
| return ""; // MSVC needs that. |
| } |
| |
| const char* TaskTypeToString(TaskType task_type) { |
| switch (task_type) { |
| case TaskType::kDeprecatedNone: |
| return "None"; |
| case TaskType::kDOMManipulation: |
| return "DOMManipultion"; |
| case TaskType::kUserInteraction: |
| return "UserInteraction"; |
| case TaskType::kNetworking: |
| return "Networking"; |
| case TaskType::kNetworkingControl: |
| return "NetworkingControl"; |
| case TaskType::kHistoryTraversal: |
| return "HistoryTraversal"; |
| case TaskType::kEmbed: |
| return "Embed"; |
| case TaskType::kMediaElementEvent: |
| return "MediaElementEvent"; |
| case TaskType::kCanvasBlobSerialization: |
| return "CanvasBlobSerialization"; |
| case TaskType::kMicrotask: |
| return "Microtask"; |
| case TaskType::kJavascriptTimer: |
| return "JavascriptTimer"; |
| case TaskType::kRemoteEvent: |
| return "RemoteEvent"; |
| case TaskType::kWebSocket: |
| return "WebSocket"; |
| case TaskType::kPostedMessage: |
| return "PostedMessage"; |
| case TaskType::kUnshippedPortMessage: |
| return "UnshipedPortMessage"; |
| case TaskType::kFileReading: |
| return "FileReading"; |
| case TaskType::kDatabaseAccess: |
| return "DatabaseAccess"; |
| case TaskType::kPresentation: |
| return "Presentation"; |
| case TaskType::kSensor: |
| return "Sensor"; |
| case TaskType::kPerformanceTimeline: |
| return "PerformanceTimeline"; |
| case TaskType::kWebGL: |
| return "WebGL"; |
| case TaskType::kIdleTask: |
| return "IdleTask"; |
| case TaskType::kMiscPlatformAPI: |
| return "MiscPlatformAPI"; |
| case TaskType::kInternalDefault: |
| return "InternalDefault"; |
| case TaskType::kInternalLoading: |
| return "InternalLoading"; |
| case TaskType::kUnthrottled: |
| return "Unthrottled"; |
| case TaskType::kInternalTest: |
| return "InternalTest"; |
| case TaskType::kInternalWebCrypto: |
| return "InternalWebCrypto"; |
| case TaskType::kInternalIndexedDB: |
| return "InternalIndexedDB"; |
| case TaskType::kInternalMedia: |
| return "InternalMedia"; |
| case TaskType::kInternalMediaRealTime: |
| return "InternalMediaRealTime"; |
| case TaskType::kInternalIPC: |
| return "InternalIPC"; |
| case TaskType::kInternalUserInteraction: |
| return "InternalUserInteraction"; |
| case TaskType::kInternalInspector: |
| return "InternalInspector"; |
| case TaskType::kInternalAnimation: |
| return "InternalAnimation"; |
| case TaskType::kInternalAccessibility: |
| return "InternalAccessibility"; |
| case TaskType::kCount: |
| return "Count"; |
| } |
| NOTREACHED(); |
| return ""; |
| } |
| |
| const char* OptionalTaskDescriptionToString( |
| base::Optional<MainThreadSchedulerImpl::TaskDescriptionForTracing> desc) { |
| if (!desc) |
| return nullptr; |
| if (desc->task_type != TaskType::kDeprecatedNone) |
| return TaskTypeToString(desc->task_type); |
| if (!desc->queue_type) |
| return "detached_tq"; |
| return MainThreadTaskQueue::NameForQueueType(desc->queue_type.value()); |
| } |
| |
| bool IsUnconditionalHighPriorityInputEnabled() { |
| return base::FeatureList::IsEnabled(kHighPriorityInput); |
| } |
| |
| } // namespace |
| |
| MainThreadSchedulerImpl::MainThreadSchedulerImpl( |
| std::unique_ptr<TaskQueueManager> task_queue_manager, |
| base::Optional<base::Time> initial_virtual_time) |
| : helper_(std::move(task_queue_manager), this), |
| idle_helper_(&helper_, |
| this, |
| "MainThreadSchedulerIdlePeriod", |
| base::TimeDelta(), |
| helper_.NewTaskQueue( |
| MainThreadTaskQueue::QueueCreationParams( |
| MainThreadTaskQueue::QueueType::kIdle) |
| .SetFixedPriority( |
| TaskQueue::QueuePriority::kBestEffortPriority))), |
| idle_canceled_delayed_task_sweeper_(&helper_, |
| idle_helper_.IdleTaskRunner()), |
| render_widget_scheduler_signals_(this), |
| control_task_queue_(helper_.ControlMainThreadTaskQueue()), |
| compositor_task_queue_( |
| helper_.NewTaskQueue(MainThreadTaskQueue::QueueCreationParams( |
| MainThreadTaskQueue::QueueType::kCompositor) |
| .SetShouldMonitorQuiescence(true))), |
| input_task_queue_(helper_.NewTaskQueue( |
| MainThreadTaskQueue::QueueCreationParams( |
| MainThreadTaskQueue::QueueType::kInput) |
| .SetShouldMonitorQuiescence(true) |
| .SetFixedPriority( |
| IsUnconditionalHighPriorityInputEnabled() |
| ? base::make_optional( |
| TaskQueue::QueuePriority::kHighestPriority) |
| : base::nullopt))), |
| compositor_task_queue_enabled_voter_( |
| compositor_task_queue_->CreateQueueEnabledVoter()), |
| input_task_queue_enabled_voter_( |
| input_task_queue_->CreateQueueEnabledVoter()), |
| delayed_update_policy_runner_( |
| base::BindRepeating(&MainThreadSchedulerImpl::UpdatePolicy, |
| base::Unretained(this)), |
| helper_.ControlMainThreadTaskQueue()), |
| queueing_time_estimator_(this, kQueueingTimeWindowDuration, 20), |
| main_thread_only_(this, |
| compositor_task_queue_, |
| helper_.GetClock(), |
| helper_.NowTicks()), |
| any_thread_(this), |
| policy_may_need_update_(&any_thread_lock_), |
| weak_factory_(this) { |
| task_queue_throttler_.reset( |
| new TaskQueueThrottler(this, &tracing_controller_)); |
| update_policy_closure_ = base::BindRepeating( |
| &MainThreadSchedulerImpl::UpdatePolicy, weak_factory_.GetWeakPtr()); |
| end_renderer_hidden_idle_period_closure_.Reset(base::BindRepeating( |
| &MainThreadSchedulerImpl::EndIdlePeriod, weak_factory_.GetWeakPtr())); |
| |
| // Compositor task queue and default task queue should be managed by |
| // WebMainThreadScheduler. Control task queue should not. |
| task_runners_.insert( |
| std::make_pair(helper_.DefaultMainThreadTaskQueue(), nullptr)); |
| task_runners_.insert( |
| std::make_pair(compositor_task_queue_, |
| compositor_task_queue_->CreateQueueEnabledVoter())); |
| task_runners_.insert(std::make_pair( |
| input_task_queue_, input_task_queue_->CreateQueueEnabledVoter())); |
| |
| v8_task_queue_ = NewTaskQueue(MainThreadTaskQueue::QueueCreationParams( |
| MainThreadTaskQueue::QueueType::kV8)); |
| ipc_task_queue_ = NewTaskQueue(MainThreadTaskQueue::QueueCreationParams( |
| MainThreadTaskQueue::QueueType::kIPC)); |
| |
| TRACE_EVENT_OBJECT_CREATED_WITH_ID( |
| TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), "MainThreadScheduler", |
| this); |
| |
| helper_.SetObserver(this); |
| |
| // Register a tracing state observer unless we're running in a test without a |
| // task runner. Note that it's safe to remove a non-existent observer. |
| if (base::ThreadTaskRunnerHandle::IsSet()) { |
| base::trace_event::TraceLog::GetInstance()->AddAsyncEnabledStateObserver( |
| weak_factory_.GetWeakPtr()); |
| } |
| |
| int32_t delay_for_background_tab_freezing_millis; |
| if (!base::StringToInt( |
| base::GetFieldTrialParamValue("BackgroundTabFreezing", |
| "DelayForBackgroundTabFreezingMills"), |
| &delay_for_background_tab_freezing_millis)) { |
| delay_for_background_tab_freezing_millis = |
| kDelayForBackgroundTabFreezingMillis; |
| } |
| delay_for_background_tab_freezing_ = base::TimeDelta::FromMilliseconds( |
| delay_for_background_tab_freezing_millis); |
| |
| internal::ProcessState::Get()->is_process_backgrounded = |
| main_thread_only().renderer_backgrounded; |
| |
| if (initial_virtual_time) { |
| main_thread_only().initial_virtual_time = *initial_virtual_time; |
| // The real uptime of the machine is irrelevant if we're using virtual time |
| // we choose an arbitrary initial offset. |
| main_thread_only().initial_virtual_time_ticks = |
| base::TimeTicks() + base::TimeDelta::FromSeconds(10); |
| EnableVirtualTime(BaseTimeOverridePolicy::OVERRIDE); |
| SetVirtualTimePolicy(VirtualTimePolicy::kPause); |
| } |
| } |
| |
| MainThreadSchedulerImpl::~MainThreadSchedulerImpl() { |
| TRACE_EVENT_OBJECT_DELETED_WITH_ID( |
| TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), "MainThreadScheduler", |
| this); |
| |
| for (auto& pair : task_runners_) { |
| TaskCostEstimator* observer = nullptr; |
| switch (pair.first->queue_class()) { |
| case MainThreadTaskQueue::QueueClass::kLoading: |
| observer = &main_thread_only().loading_task_cost_estimator; |
| break; |
| case MainThreadTaskQueue::QueueClass::kTimer: |
| observer = &main_thread_only().timer_task_cost_estimator; |
| break; |
| default: |
| observer = nullptr; |
| } |
| |
| if (observer) |
| pair.first->RemoveTaskObserver(observer); |
| |
| pair.first->ShutdownTaskQueue(); |
| } |
| |
| if (virtual_time_domain_) |
| UnregisterTimeDomain(virtual_time_domain_.get()); |
| |
| if (virtual_time_control_task_queue_) |
| virtual_time_control_task_queue_->ShutdownTaskQueue(); |
| |
| base::trace_event::TraceLog::GetInstance()->RemoveAsyncEnabledStateObserver( |
| this); |
| |
| // Ensure the renderer scheduler was shut down explicitly, because otherwise |
| // we could end up having stale pointers to the Blink heap which has been |
| // terminated by this point. |
| DCHECK(was_shutdown_); |
| } |
| |
| MainThreadSchedulerImpl::MainThreadOnly::MainThreadOnly( |
| MainThreadSchedulerImpl* main_thread_scheduler_impl, |
| const scoped_refptr<MainThreadTaskQueue>& compositor_task_runner, |
| const base::TickClock* time_source, |
| base::TimeTicks now) |
| : loading_task_cost_estimator(time_source, |
| kLoadingTaskEstimationSampleCount, |
| kLoadingTaskEstimationPercentile), |
| timer_task_cost_estimator(time_source, |
| kTimerTaskEstimationSampleCount, |
| kTimerTaskEstimationPercentile), |
| idle_time_estimator(compositor_task_runner, |
| time_source, |
| kShortIdlePeriodDurationSampleCount, |
| kShortIdlePeriodDurationPercentile), |
| current_use_case(UseCase::kNone, |
| "Scheduler.UseCase", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| UseCaseToString), |
| longest_jank_free_task_duration( |
| base::TimeDelta(), |
| "Scheduler.LongestJankFreeTaskDuration", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| TimeDeltaToMilliseconds), |
| renderer_pause_count(0, |
| "Scheduler.PauseCount", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_), |
| navigation_task_expected_count( |
| 0, |
| "Scheduler.NavigationTaskExpectedCount", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_), |
| expensive_task_policy(ExpensiveTaskPolicy::kRun, |
| "Scheduler.ExpensiveTaskPolicy", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| ExpensiveTaskPolicyToString), |
| rail_mode_for_tracing(current_policy.rail_mode(), |
| "Scheduler.RAILMode", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| RAILModeToString), |
| renderer_hidden(false, |
| "Scheduler.Hidden", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| HiddenStateToString), |
| renderer_backgrounded(kLaunchingProcessIsBackgrounded, |
| "RendererVisibility", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| BackgroundStateToString), |
| keep_active_fetch_or_worker( |
| false, |
| "Scheduler.KeepRendererActive", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| freezing_when_backgrounded_enabled( |
| false, |
| "MainThreadScheduler.FreezingWhenBackgroundedEnabled", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| frozen_when_backgrounded(false, |
| "MainThreadScheduler.FrozenWhenBackgrounded", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| loading_task_estimated_cost( |
| base::TimeDelta(), |
| "Scheduler.LoadingTaskEstimatedCostMs", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| TimeDeltaToMilliseconds), |
| timer_task_estimated_cost( |
| base::TimeDelta(), |
| "Scheduler.TimerTaskEstimatedCostMs", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| TimeDeltaToMilliseconds), |
| loading_tasks_seem_expensive( |
| false, |
| "Scheduler.LoadingTasksSeemExpensive", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| timer_tasks_seem_expensive( |
| false, |
| "Scheduler.TimerTasksSeemExpensive", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| touchstart_expected_soon(false, |
| "Scheduler.TouchstartExpectedSoon", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| have_seen_a_begin_main_frame( |
| false, |
| "Scheduler.HasSeenBeginMainFrame", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| have_reported_blocking_intervention_in_current_policy( |
| false, |
| "Scheduler.HasReportedBlockingInterventionInCurrentPolicy", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| have_reported_blocking_intervention_since_navigation( |
| false, |
| "Scheduler.HasReportedBlockingInterventionSinceNavigation", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| has_visible_render_widget_with_touch_handler( |
| false, |
| "Scheduler.HasVisibleRenderWidgetWithTouchHandler", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| begin_frame_not_expected_soon( |
| false, |
| "Scheduler.BeginFrameNotExpectedSoon", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| in_idle_period_for_testing( |
| false, |
| "Scheduler.InIdlePeriod", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| use_virtual_time(false, |
| "Scheduler.UseVirtualTime", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| is_audio_playing(false, |
| "RendererAudioState", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| AudioPlayingStateToString), |
| compositor_will_send_main_frame_not_expected( |
| false, |
| "Scheduler.CompositorWillSendMainFrameNotExpected", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| has_navigated(false, |
| "Scheduler.HasNavigated", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| pause_timers_for_webview(false, |
| "Scheduler.PauseTimersForWebview", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| background_status_changed_at(now), |
| rail_mode_observer(nullptr), |
| wake_up_budget_pool(nullptr), |
| metrics_helper(main_thread_scheduler_impl, now, renderer_backgrounded), |
| process_type(RendererProcessType::kRenderer, |
| "RendererProcessType", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| RendererProcessTypeToString), |
| task_description_for_tracing( |
| base::nullopt, |
| "Scheduler.MainThreadTask", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| OptionalTaskDescriptionToString), |
| virtual_time_policy(VirtualTimePolicy::kAdvance), |
| virtual_time_pause_count(0), |
| max_virtual_time_task_starvation_count(0), |
| virtual_time_stopped(false), |
| nested_runloop(false), |
| uniform_distribution(0.0f, 1.0f) {} |
| |
| MainThreadSchedulerImpl::MainThreadOnly::~MainThreadOnly() = default; |
| |
| MainThreadSchedulerImpl::AnyThread::AnyThread( |
| MainThreadSchedulerImpl* main_thread_scheduler_impl) |
| : awaiting_touch_start_response( |
| false, |
| "Scheduler.AwaitingTouchstartResponse", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| in_idle_period(false, |
| "Scheduler.InIdlePeriod", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| begin_main_frame_on_critical_path( |
| false, |
| "Scheduler.BeginMainFrameOnCriticalPath", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| last_gesture_was_compositor_driven( |
| false, |
| "Scheduler.LastGestureWasCompositorDriven", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| default_gesture_prevented( |
| true, |
| "Scheduler.DefaultGesturePrevented", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| have_seen_a_potentially_blocking_gesture( |
| false, |
| "Scheduler.HaveSeenPotentiallyBlockingGesture", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| waiting_for_meaningful_paint( |
| false, |
| "Scheduler.WaitingForMeaningfulPaint", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString), |
| have_seen_input_since_navigation( |
| false, |
| "Scheduler.HaveSeenInputSinceNavigation", |
| main_thread_scheduler_impl, |
| &main_thread_scheduler_impl->tracing_controller_, |
| YesNoStateToString) {} |
| |
| MainThreadSchedulerImpl::AnyThread::~AnyThread() = default; |
| |
| MainThreadSchedulerImpl::CompositorThreadOnly::CompositorThreadOnly() |
| : last_input_type(blink::WebInputEvent::kUndefined) {} |
| |
| MainThreadSchedulerImpl::CompositorThreadOnly::~CompositorThreadOnly() = |
| default; |
| |
| MainThreadSchedulerImpl::RendererPauseHandleImpl::RendererPauseHandleImpl( |
| MainThreadSchedulerImpl* scheduler) |
| : scheduler_(scheduler) { |
| scheduler_->PauseRendererImpl(); |
| } |
| |
| MainThreadSchedulerImpl::RendererPauseHandleImpl::~RendererPauseHandleImpl() { |
| scheduler_->ResumeRendererImpl(); |
| } |
| |
| void MainThreadSchedulerImpl::Shutdown() { |
| if (was_shutdown_) |
| return; |
| |
| base::TimeTicks now = tick_clock()->NowTicks(); |
| main_thread_only().metrics_helper.OnRendererShutdown(now); |
| |
| task_queue_throttler_.reset(); |
| idle_helper_.Shutdown(); |
| helper_.Shutdown(); |
| main_thread_only().rail_mode_observer = nullptr; |
| was_shutdown_ = true; |
| } |
| |
| std::unique_ptr<blink::WebThread> MainThreadSchedulerImpl::CreateMainThread() { |
| return std::make_unique<WebThreadImplForRendererScheduler>(this); |
| } |
| |
| scoped_refptr<base::SingleThreadTaskRunner> |
| MainThreadSchedulerImpl::DefaultTaskRunner() { |
| return helper_.DefaultMainThreadTaskQueue(); |
| } |
| |
| scoped_refptr<base::SingleThreadTaskRunner> |
| MainThreadSchedulerImpl::CompositorTaskRunner() { |
| helper_.CheckOnValidThread(); |
| return compositor_task_queue_; |
| } |
| |
| scoped_refptr<base::SingleThreadTaskRunner> |
| MainThreadSchedulerImpl::InputTaskRunner() { |
| helper_.CheckOnValidThread(); |
| return input_task_queue_; |
| } |
| |
| scoped_refptr<SingleThreadIdleTaskRunner> |
| MainThreadSchedulerImpl::IdleTaskRunner() { |
| return idle_helper_.IdleTaskRunner(); |
| } |
| |
| scoped_refptr<base::SingleThreadTaskRunner> |
| MainThreadSchedulerImpl::IPCTaskRunner() { |
| return ipc_task_queue_; |
| } |
| |
| scoped_refptr<MainThreadTaskQueue> MainThreadSchedulerImpl::DefaultTaskQueue() { |
| return helper_.DefaultMainThreadTaskQueue(); |
| } |
| |
| scoped_refptr<MainThreadTaskQueue> |
| MainThreadSchedulerImpl::CompositorTaskQueue() { |
| helper_.CheckOnValidThread(); |
| return compositor_task_queue_; |
| } |
| |
| scoped_refptr<MainThreadTaskQueue> MainThreadSchedulerImpl::InputTaskQueue() { |
| helper_.CheckOnValidThread(); |
| return input_task_queue_; |
| } |
| |
| scoped_refptr<MainThreadTaskQueue> MainThreadSchedulerImpl::V8TaskQueue() { |
| helper_.CheckOnValidThread(); |
| return v8_task_queue_; |
| } |
| |
| scoped_refptr<MainThreadTaskQueue> MainThreadSchedulerImpl::ControlTaskQueue() { |
| helper_.CheckOnValidThread(); |
| return helper_.ControlMainThreadTaskQueue(); |
| } |
| |
| scoped_refptr<MainThreadTaskQueue> |
| MainThreadSchedulerImpl::VirtualTimeControlTaskQueue() { |
| helper_.CheckOnValidThread(); |
| return virtual_time_control_task_queue_; |
| } |
| |
| scoped_refptr<MainThreadTaskQueue> MainThreadSchedulerImpl::NewTaskQueue( |
| const MainThreadTaskQueue::QueueCreationParams& params) { |
| helper_.CheckOnValidThread(); |
| scoped_refptr<MainThreadTaskQueue> task_queue(helper_.NewTaskQueue(params)); |
| |
| std::unique_ptr<TaskQueue::QueueEnabledVoter> voter; |
| if (params.can_be_deferred || params.can_be_paused || params.can_be_frozen) |
| voter = task_queue->CreateQueueEnabledVoter(); |
| |
| auto insert_result = |
| task_runners_.insert(std::make_pair(task_queue, std::move(voter))); |
| auto queue_class = task_queue->queue_class(); |
| if (queue_class == MainThreadTaskQueue::QueueClass::kTimer) { |
| task_queue->AddTaskObserver(&main_thread_only().timer_task_cost_estimator); |
| } else if (queue_class == MainThreadTaskQueue::QueueClass::kLoading) { |
| task_queue->AddTaskObserver( |
| &main_thread_only().loading_task_cost_estimator); |
| } |
| |
| ApplyTaskQueuePolicy( |
| task_queue.get(), insert_result.first->second.get(), TaskQueuePolicy(), |
| main_thread_only().current_policy.GetQueuePolicy(queue_class)); |
| |
| if (task_queue->CanBeThrottled()) |
| AddQueueToWakeUpBudgetPool(task_queue.get()); |
| |
| // If this is a timer queue, and virtual time is enabled and paused, it should |
| // be suspended by adding a fence to prevent immediate tasks from running when |
| // they're not supposed to. |
| if (queue_class == MainThreadTaskQueue::QueueClass::kTimer && |
| main_thread_only().virtual_time_stopped && |
| main_thread_only().use_virtual_time) { |
| task_queue->InsertFence(TaskQueue::InsertFencePosition::kNow); |
| } |
| |
| return task_queue; |
| } |
| |
| scoped_refptr<MainThreadTaskQueue> MainThreadSchedulerImpl::NewLoadingTaskQueue( |
| MainThreadTaskQueue::QueueType queue_type) { |
| DCHECK_EQ(MainThreadTaskQueue::QueueClassForQueueType(queue_type), |
| MainThreadTaskQueue::QueueClass::kLoading); |
| return NewTaskQueue( |
| MainThreadTaskQueue::QueueCreationParams(queue_type) |
| .SetCanBePaused(true) |
| .SetCanBeFrozen( |
| RuntimeEnabledFeatures::StopLoadingInBackgroundEnabled()) |
| .SetCanBeDeferred(true) |
| .SetUsedForImportantTasks( |
| queue_type == |
| MainThreadTaskQueue::QueueType::kFrameLoadingControl)); |
| } |
| |
| scoped_refptr<MainThreadTaskQueue> MainThreadSchedulerImpl::NewTimerTaskQueue( |
| MainThreadTaskQueue::QueueType queue_type) { |
| DCHECK_EQ(MainThreadTaskQueue::QueueClassForQueueType(queue_type), |
| MainThreadTaskQueue::QueueClass::kTimer); |
| return NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(queue_type) |
| .SetCanBePaused(true) |
| .SetCanBeFrozen(true) |
| .SetCanBeDeferred(true) |
| .SetCanBeThrottled(true)); |
| } |
| |
| std::unique_ptr<WebRenderWidgetSchedulingState> |
| MainThreadSchedulerImpl::NewRenderWidgetSchedulingState() { |
| return render_widget_scheduler_signals_.NewRenderWidgetSchedulingState(); |
| } |
| |
| void MainThreadSchedulerImpl::OnShutdownTaskQueue( |
| const scoped_refptr<MainThreadTaskQueue>& task_queue) { |
| if (was_shutdown_) |
| return; |
| |
| if (task_queue_throttler_) |
| task_queue_throttler_->ShutdownTaskQueue(task_queue.get()); |
| |
| if (task_runners_.erase(task_queue)) { |
| switch (task_queue->queue_class()) { |
| case MainThreadTaskQueue::QueueClass::kTimer: |
| task_queue->RemoveTaskObserver( |
| &main_thread_only().timer_task_cost_estimator); |
| break; |
| case MainThreadTaskQueue::QueueClass::kLoading: |
| task_queue->RemoveTaskObserver( |
| &main_thread_only().loading_task_cost_estimator); |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| |
| bool MainThreadSchedulerImpl::CanExceedIdleDeadlineIfRequired() const { |
| return idle_helper_.CanExceedIdleDeadlineIfRequired(); |
| } |
| |
| void MainThreadSchedulerImpl::AddTaskObserver( |
| base::MessageLoop::TaskObserver* task_observer) { |
| helper_.AddTaskObserver(task_observer); |
| } |
| |
| void MainThreadSchedulerImpl::RemoveTaskObserver( |
| base::MessageLoop::TaskObserver* task_observer) { |
| helper_.RemoveTaskObserver(task_observer); |
| } |
| |
| void MainThreadSchedulerImpl::WillBeginFrame(const viz::BeginFrameArgs& args) { |
| TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::WillBeginFrame", "args", |
| args.AsValue()); |
| helper_.CheckOnValidThread(); |
| if (helper_.IsShutdown()) |
| return; |
| |
| EndIdlePeriod(); |
| main_thread_only().estimated_next_frame_begin = |
| args.frame_time + args.interval; |
| main_thread_only().have_seen_a_begin_main_frame = true; |
| main_thread_only().begin_frame_not_expected_soon = false; |
| main_thread_only().compositor_frame_interval = args.interval; |
| { |
| base::AutoLock lock(any_thread_lock_); |
| any_thread().begin_main_frame_on_critical_path = args.on_critical_path; |
| } |
| } |
| |
| void MainThreadSchedulerImpl::DidCommitFrameToCompositor() { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::DidCommitFrameToCompositor"); |
| helper_.CheckOnValidThread(); |
| if (helper_.IsShutdown()) |
| return; |
| |
| base::TimeTicks now(helper_.NowTicks()); |
| if (now < main_thread_only().estimated_next_frame_begin) { |
| // TODO(rmcilroy): Consider reducing the idle period based on the runtime of |
| // the next pending delayed tasks (as currently done in for long idle times) |
| idle_helper_.StartIdlePeriod( |
| IdleHelper::IdlePeriodState::kInShortIdlePeriod, now, |
| main_thread_only().estimated_next_frame_begin); |
| } |
| |
| main_thread_only().idle_time_estimator.DidCommitFrameToCompositor(); |
| } |
| |
| void MainThreadSchedulerImpl::BeginFrameNotExpectedSoon() { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::BeginFrameNotExpectedSoon"); |
| helper_.CheckOnValidThread(); |
| if (helper_.IsShutdown()) |
| return; |
| |
| main_thread_only().begin_frame_not_expected_soon = true; |
| idle_helper_.EnableLongIdlePeriod(); |
| { |
| base::AutoLock lock(any_thread_lock_); |
| any_thread().begin_main_frame_on_critical_path = false; |
| } |
| } |
| |
| void MainThreadSchedulerImpl::BeginMainFrameNotExpectedUntil( |
| base::TimeTicks time) { |
| helper_.CheckOnValidThread(); |
| if (helper_.IsShutdown()) |
| return; |
| |
| base::TimeTicks now(helper_.NowTicks()); |
| TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::BeginMainFrameNotExpectedUntil", |
| "time_remaining", (time - now).InMillisecondsF()); |
| |
| if (now < time) { |
| // End any previous idle period. |
| EndIdlePeriod(); |
| |
| // TODO(rmcilroy): Consider reducing the idle period based on the runtime of |
| // the next pending delayed tasks (as currently done in for long idle times) |
| idle_helper_.StartIdlePeriod( |
| IdleHelper::IdlePeriodState::kInShortIdlePeriod, now, time); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::SetAllRenderWidgetsHidden(bool hidden) { |
| TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::SetAllRenderWidgetsHidden", "hidden", |
| hidden); |
| |
| helper_.CheckOnValidThread(); |
| |
| if (helper_.IsShutdown() || main_thread_only().renderer_hidden == hidden) |
| return; |
| |
| end_renderer_hidden_idle_period_closure_.Cancel(); |
| |
| if (hidden) { |
| idle_helper_.EnableLongIdlePeriod(); |
| |
| // Ensure that we stop running idle tasks after a few seconds of being |
| // hidden. |
| base::TimeDelta end_idle_when_hidden_delay = |
| base::TimeDelta::FromMilliseconds(kEndIdleWhenHiddenDelayMillis); |
| control_task_queue_->PostDelayedTask( |
| FROM_HERE, end_renderer_hidden_idle_period_closure_.GetCallback(), |
| end_idle_when_hidden_delay); |
| main_thread_only().renderer_hidden = true; |
| } else { |
| main_thread_only().renderer_hidden = false; |
| EndIdlePeriod(); |
| } |
| |
| // TODO(alexclarke): Should we update policy here? |
| CreateTraceEventObjectSnapshot(); |
| } |
| |
| void MainThreadSchedulerImpl::SetHasVisibleRenderWidgetWithTouchHandler( |
| bool has_visible_render_widget_with_touch_handler) { |
| helper_.CheckOnValidThread(); |
| if (has_visible_render_widget_with_touch_handler == |
| main_thread_only().has_visible_render_widget_with_touch_handler) |
| return; |
| |
| main_thread_only().has_visible_render_widget_with_touch_handler = |
| has_visible_render_widget_with_touch_handler; |
| |
| base::AutoLock lock(any_thread_lock_); |
| UpdatePolicyLocked(UpdateType::kForceUpdate); |
| } |
| |
| void MainThreadSchedulerImpl::SetRendererHidden(bool hidden) { |
| if (hidden) { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::OnRendererHidden"); |
| } else { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::OnRendererVisible"); |
| } |
| helper_.CheckOnValidThread(); |
| main_thread_only().renderer_hidden = hidden; |
| } |
| |
| void MainThreadSchedulerImpl::SetRendererBackgrounded(bool backgrounded) { |
| helper_.CheckOnValidThread(); |
| if (helper_.IsShutdown() || |
| main_thread_only().renderer_backgrounded == backgrounded) |
| return; |
| if (backgrounded) { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::OnRendererBackgrounded"); |
| MainThreadMetricsHelper::RecordBackgroundedTransition( |
| BackgroundedRendererTransition::kBackgrounded); |
| } else { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::OnRendererForegrounded"); |
| MainThreadMetricsHelper::RecordBackgroundedTransition( |
| BackgroundedRendererTransition::kForegrounded); |
| } |
| |
| main_thread_only().renderer_backgrounded = backgrounded; |
| internal::ProcessState::Get()->is_process_backgrounded = backgrounded; |
| |
| main_thread_only().background_status_changed_at = tick_clock()->NowTicks(); |
| queueing_time_estimator_.OnRendererStateChanged( |
| backgrounded, main_thread_only().background_status_changed_at); |
| |
| UpdatePolicy(); |
| |
| base::TimeTicks now = tick_clock()->NowTicks(); |
| if (backgrounded) { |
| main_thread_only().metrics_helper.OnRendererBackgrounded(now); |
| } else { |
| main_thread_only().metrics_helper.OnRendererForegrounded(now); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::SetSchedulerKeepActive(bool keep_active) { |
| main_thread_only().keep_active_fetch_or_worker = keep_active; |
| for (PageSchedulerImpl* page_scheduler : main_thread_only().page_schedulers) { |
| page_scheduler->SetKeepActive(keep_active); |
| } |
| } |
| |
| bool MainThreadSchedulerImpl::SchedulerKeepActive() { |
| return main_thread_only().keep_active_fetch_or_worker; |
| } |
| |
| #if defined(OS_ANDROID) |
| void MainThreadSchedulerImpl::PauseTimersForAndroidWebView() { |
| main_thread_only().pause_timers_for_webview = true; |
| UpdatePolicy(); |
| } |
| |
| void MainThreadSchedulerImpl::ResumeTimersForAndroidWebView() { |
| main_thread_only().pause_timers_for_webview = false; |
| UpdatePolicy(); |
| } |
| #endif |
| |
| void MainThreadSchedulerImpl::OnAudioStateChanged() { |
| bool is_audio_playing = false; |
| for (PageSchedulerImpl* page_scheduler : main_thread_only().page_schedulers) { |
| is_audio_playing = is_audio_playing || page_scheduler->IsAudioPlaying(); |
| } |
| |
| if (is_audio_playing == main_thread_only().is_audio_playing) |
| return; |
| |
| main_thread_only().is_audio_playing = is_audio_playing; |
| } |
| |
| std::unique_ptr<MainThreadSchedulerImpl::RendererPauseHandle> |
| MainThreadSchedulerImpl::PauseRenderer() { |
| return std::make_unique<RendererPauseHandleImpl>(this); |
| } |
| |
| void MainThreadSchedulerImpl::PauseRendererImpl() { |
| helper_.CheckOnValidThread(); |
| if (helper_.IsShutdown()) |
| return; |
| |
| ++main_thread_only().renderer_pause_count; |
| UpdatePolicy(); |
| } |
| |
| void MainThreadSchedulerImpl::ResumeRendererImpl() { |
| helper_.CheckOnValidThread(); |
| if (helper_.IsShutdown()) |
| return; |
| --main_thread_only().renderer_pause_count; |
| DCHECK_GE(main_thread_only().renderer_pause_count.value(), 0); |
| UpdatePolicy(); |
| } |
| |
| void MainThreadSchedulerImpl::EndIdlePeriod() { |
| if (main_thread_only().in_idle_period_for_testing) |
| return; |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::EndIdlePeriod"); |
| helper_.CheckOnValidThread(); |
| idle_helper_.EndIdlePeriod(); |
| } |
| |
| void MainThreadSchedulerImpl::EndIdlePeriodForTesting( |
| const base::Closure& callback, |
| base::TimeTicks time_remaining) { |
| main_thread_only().in_idle_period_for_testing = false; |
| EndIdlePeriod(); |
| callback.Run(); |
| } |
| |
| bool MainThreadSchedulerImpl::PolicyNeedsUpdateForTesting() { |
| return policy_may_need_update_.IsSet(); |
| } |
| |
| // static |
| bool MainThreadSchedulerImpl::ShouldPrioritizeInputEvent( |
| const blink::WebInputEvent& web_input_event) { |
| // We regard MouseMove events with the left mouse button down as a signal |
| // that the user is doing something requiring a smooth frame rate. |
| if ((web_input_event.GetType() == blink::WebInputEvent::kMouseDown || |
| web_input_event.GetType() == blink::WebInputEvent::kMouseMove) && |
| (web_input_event.GetModifiers() & |
| blink::WebInputEvent::kLeftButtonDown)) { |
| return true; |
| } |
| // Ignore all other mouse events because they probably don't signal user |
| // interaction needing a smooth framerate. NOTE isMouseEventType returns false |
| // for mouse wheel events, hence we regard them as user input. |
| // Ignore keyboard events because it doesn't really make sense to enter |
| // compositor priority for them. |
| if (blink::WebInputEvent::IsMouseEventType(web_input_event.GetType()) || |
| blink::WebInputEvent::IsKeyboardEventType(web_input_event.GetType())) { |
| return false; |
| } |
| return true; |
| } |
| |
| void MainThreadSchedulerImpl::DidHandleInputEventOnCompositorThread( |
| const blink::WebInputEvent& web_input_event, |
| InputEventState event_state) { |
| TRACE_EVENT0( |
| TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::DidHandleInputEventOnCompositorThread"); |
| if (!ShouldPrioritizeInputEvent(web_input_event)) |
| return; |
| |
| UpdateForInputEventOnCompositorThread(web_input_event.GetType(), event_state); |
| } |
| |
| void MainThreadSchedulerImpl::DidAnimateForInputOnCompositorThread() { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::DidAnimateForInputOnCompositorThread"); |
| base::AutoLock lock(any_thread_lock_); |
| any_thread().fling_compositor_escalation_deadline = |
| helper_.NowTicks() + |
| base::TimeDelta::FromMilliseconds(kFlingEscalationLimitMillis); |
| } |
| |
| void MainThreadSchedulerImpl::UpdateForInputEventOnCompositorThread( |
| blink::WebInputEvent::Type type, |
| InputEventState input_event_state) { |
| base::AutoLock lock(any_thread_lock_); |
| base::TimeTicks now = helper_.NowTicks(); |
| |
| // TODO(alexclarke): Move WebInputEventTraits where we can access it from here |
| // and record the name rather than the integer representation. |
| TRACE_EVENT2(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::UpdateForInputEventOnCompositorThread", |
| "type", static_cast<int>(type), "input_event_state", |
| InputEventStateToString(input_event_state)); |
| |
| base::TimeDelta unused_policy_duration; |
| UseCase previous_use_case = |
| ComputeCurrentUseCase(now, &unused_policy_duration); |
| bool was_awaiting_touch_start_response = |
| any_thread().awaiting_touch_start_response; |
| |
| any_thread().user_model.DidStartProcessingInputEvent(type, now); |
| any_thread().have_seen_input_since_navigation = true; |
| |
| if (input_event_state == InputEventState::EVENT_CONSUMED_BY_COMPOSITOR) |
| any_thread().user_model.DidFinishProcessingInputEvent(now); |
| |
| switch (type) { |
| case blink::WebInputEvent::kTouchStart: |
| any_thread().awaiting_touch_start_response = true; |
| // This is just a fail-safe to reset the state of |
| // |last_gesture_was_compositor_driven| to the default. We don't know |
| // yet where the gesture will run. |
| any_thread().last_gesture_was_compositor_driven = false; |
| any_thread().have_seen_a_potentially_blocking_gesture = true; |
| // Assume the default gesture is prevented until we see evidence |
| // otherwise. |
| any_thread().default_gesture_prevented = true; |
| break; |
| |
| case blink::WebInputEvent::kTouchMove: |
| // Observation of consecutive touchmoves is a strong signal that the |
| // page is consuming the touch sequence, in which case touchstart |
| // response prioritization is no longer necessary. Otherwise, the |
| // initial touchmove should preserve the touchstart response pending |
| // state. |
| if (any_thread().awaiting_touch_start_response && |
| GetCompositorThreadOnly().last_input_type == |
| blink::WebInputEvent::kTouchMove) { |
| any_thread().awaiting_touch_start_response = false; |
| } |
| break; |
| |
| case blink::WebInputEvent::kGesturePinchUpdate: |
| case blink::WebInputEvent::kGestureScrollUpdate: |
| // If we see events for an established gesture, we can lock it to the |
| // appropriate thread as the gesture can no longer be cancelled. |
| any_thread().last_gesture_was_compositor_driven = |
| input_event_state == InputEventState::EVENT_CONSUMED_BY_COMPOSITOR; |
| any_thread().awaiting_touch_start_response = false; |
| any_thread().default_gesture_prevented = false; |
| break; |
| |
| case blink::WebInputEvent::kGestureFlingCancel: |
| any_thread().fling_compositor_escalation_deadline = base::TimeTicks(); |
| break; |
| |
| case blink::WebInputEvent::kGestureTapDown: |
| case blink::WebInputEvent::kGestureShowPress: |
| case blink::WebInputEvent::kGestureScrollEnd: |
| // With no observable effect, these meta events do not indicate a |
| // meaningful touchstart response and should not impact task priority. |
| break; |
| |
| case blink::WebInputEvent::kMouseDown: |
| // Reset tracking state at the start of a new mouse drag gesture. |
| any_thread().last_gesture_was_compositor_driven = false; |
| any_thread().default_gesture_prevented = true; |
| break; |
| |
| case blink::WebInputEvent::kMouseMove: |
| // Consider mouse movement with the left button held down (see |
| // ShouldPrioritizeInputEvent) similarly to a touch gesture. |
| any_thread().last_gesture_was_compositor_driven = |
| input_event_state == InputEventState::EVENT_CONSUMED_BY_COMPOSITOR; |
| any_thread().awaiting_touch_start_response = false; |
| break; |
| |
| case blink::WebInputEvent::kMouseWheel: |
| any_thread().last_gesture_was_compositor_driven = |
| input_event_state == InputEventState::EVENT_CONSUMED_BY_COMPOSITOR; |
| any_thread().awaiting_touch_start_response = false; |
| any_thread().have_seen_a_potentially_blocking_gesture = true; |
| // If the event was sent to the main thread, assume the default gesture is |
| // prevented until we see evidence otherwise. |
| any_thread().default_gesture_prevented = |
| !any_thread().last_gesture_was_compositor_driven; |
| break; |
| |
| case blink::WebInputEvent::kUndefined: |
| break; |
| |
| default: |
| any_thread().awaiting_touch_start_response = false; |
| break; |
| } |
| |
| // Avoid unnecessary policy updates if the use case did not change. |
| UseCase use_case = ComputeCurrentUseCase(now, &unused_policy_duration); |
| |
| if (use_case != previous_use_case || |
| was_awaiting_touch_start_response != |
| any_thread().awaiting_touch_start_response) { |
| EnsureUrgentPolicyUpdatePostedOnMainThread(FROM_HERE); |
| } |
| GetCompositorThreadOnly().last_input_type = type; |
| } |
| |
| void MainThreadSchedulerImpl::DidHandleInputEventOnMainThread( |
| const WebInputEvent& web_input_event, |
| WebInputEventResult result) { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::DidHandleInputEventOnMainThread"); |
| helper_.CheckOnValidThread(); |
| if (ShouldPrioritizeInputEvent(web_input_event)) { |
| base::AutoLock lock(any_thread_lock_); |
| any_thread().user_model.DidFinishProcessingInputEvent(helper_.NowTicks()); |
| |
| // If we were waiting for a touchstart response and the main thread has |
| // prevented the default gesture, consider the gesture established. This |
| // ensures single-event gestures such as button presses are promptly |
| // detected. |
| if (any_thread().awaiting_touch_start_response && |
| result == WebInputEventResult::kHandledApplication) { |
| any_thread().awaiting_touch_start_response = false; |
| any_thread().default_gesture_prevented = true; |
| UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged); |
| } |
| } |
| } |
| |
| bool MainThreadSchedulerImpl::IsHighPriorityWorkAnticipated() { |
| helper_.CheckOnValidThread(); |
| if (helper_.IsShutdown()) |
| return false; |
| |
| MaybeUpdatePolicy(); |
| // The touchstart, synchronized gesture and main-thread gesture use cases |
| // indicate a strong likelihood of high-priority work in the near future. |
| UseCase use_case = main_thread_only().current_use_case; |
| return main_thread_only().touchstart_expected_soon || |
| use_case == UseCase::kTouchstart || |
| use_case == UseCase::kMainThreadGesture || |
| use_case == UseCase::kMainThreadCustomInputHandling || |
| use_case == UseCase::kSynchronizedGesture; |
| } |
| |
| bool MainThreadSchedulerImpl::ShouldYieldForHighPriorityWork() { |
| helper_.CheckOnValidThread(); |
| if (helper_.IsShutdown()) |
| return false; |
| |
| MaybeUpdatePolicy(); |
| // We only yield if there's a urgent task to be run now, or we are expecting |
| // one soon (touch start). |
| // Note: even though the control queue has the highest priority we don't yield |
| // for it since these tasks are not user-provided work and they are only |
| // intended to run before the next task, not interrupt the tasks. |
| switch (main_thread_only().current_use_case) { |
| case UseCase::kCompositorGesture: |
| case UseCase::kNone: |
| return main_thread_only().touchstart_expected_soon; |
| |
| case UseCase::kMainThreadGesture: |
| case UseCase::kMainThreadCustomInputHandling: |
| case UseCase::kSynchronizedGesture: |
| return compositor_task_queue_->HasTaskToRunImmediately() || |
| main_thread_only().touchstart_expected_soon; |
| |
| case UseCase::kTouchstart: |
| return true; |
| |
| case UseCase::kLoading: |
| return false; |
| |
| default: |
| NOTREACHED(); |
| return false; |
| } |
| } |
| |
| base::TimeTicks MainThreadSchedulerImpl::CurrentIdleTaskDeadlineForTesting() |
| const { |
| return idle_helper_.CurrentIdleTaskDeadline(); |
| } |
| |
| void MainThreadSchedulerImpl::RunIdleTasksForTesting( |
| const base::Closure& callback) { |
| main_thread_only().in_idle_period_for_testing = true; |
| IdleTaskRunner()->PostIdleTask( |
| FROM_HERE, |
| base::BindOnce(&MainThreadSchedulerImpl::EndIdlePeriodForTesting, |
| weak_factory_.GetWeakPtr(), callback)); |
| idle_helper_.EnableLongIdlePeriod(); |
| } |
| |
| void MainThreadSchedulerImpl::MaybeUpdatePolicy() { |
| helper_.CheckOnValidThread(); |
| if (policy_may_need_update_.IsSet()) { |
| UpdatePolicy(); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::EnsureUrgentPolicyUpdatePostedOnMainThread( |
| const base::Location& from_here) { |
| // TODO(scheduler-dev): Check that this method isn't called from the main |
| // thread. |
| any_thread_lock_.AssertAcquired(); |
| if (!policy_may_need_update_.IsSet()) { |
| policy_may_need_update_.SetWhileLocked(true); |
| control_task_queue_->PostTask(from_here, update_policy_closure_); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::UpdatePolicy() { |
| base::AutoLock lock(any_thread_lock_); |
| UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged); |
| } |
| |
| void MainThreadSchedulerImpl::ForceUpdatePolicy() { |
| base::AutoLock lock(any_thread_lock_); |
| UpdatePolicyLocked(UpdateType::kForceUpdate); |
| } |
| |
| namespace { |
| |
| void UpdatePolicyDuration(base::TimeTicks now, |
| base::TimeTicks policy_expiration, |
| base::TimeDelta* policy_duration) { |
| if (policy_expiration <= now) |
| return; |
| |
| if (policy_duration->is_zero()) { |
| *policy_duration = policy_expiration - now; |
| return; |
| } |
| |
| *policy_duration = std::min(*policy_duration, policy_expiration - now); |
| } |
| |
| } // namespace |
| |
| void MainThreadSchedulerImpl::UpdatePolicyLocked(UpdateType update_type) { |
| helper_.CheckOnValidThread(); |
| any_thread_lock_.AssertAcquired(); |
| if (helper_.IsShutdown()) |
| return; |
| |
| base::TimeTicks now = helper_.NowTicks(); |
| policy_may_need_update_.SetWhileLocked(false); |
| |
| base::TimeDelta expected_use_case_duration; |
| UseCase use_case = ComputeCurrentUseCase(now, &expected_use_case_duration); |
| main_thread_only().current_use_case = use_case; |
| |
| base::TimeDelta touchstart_expected_flag_valid_for_duration; |
| // TODO(skyostil): Consider handlers for all types of blocking gestures (e.g., |
| // mouse wheel) instead of just touchstart. |
| bool touchstart_expected_soon = false; |
| if (main_thread_only().has_visible_render_widget_with_touch_handler) { |
| touchstart_expected_soon = any_thread().user_model.IsGestureExpectedSoon( |
| now, &touchstart_expected_flag_valid_for_duration); |
| } |
| main_thread_only().touchstart_expected_soon = touchstart_expected_soon; |
| |
| base::TimeDelta longest_jank_free_task_duration = |
| EstimateLongestJankFreeTaskDuration(); |
| main_thread_only().longest_jank_free_task_duration = |
| longest_jank_free_task_duration; |
| |
| main_thread_only().loading_task_estimated_cost = |
| main_thread_only().loading_task_cost_estimator.expected_task_duration(); |
| bool loading_tasks_seem_expensive = |
| main_thread_only().loading_task_estimated_cost > |
| longest_jank_free_task_duration; |
| |
| main_thread_only().timer_task_estimated_cost = |
| main_thread_only().timer_task_cost_estimator.expected_task_duration(); |
| bool timer_tasks_seem_expensive = |
| main_thread_only().timer_task_estimated_cost > |
| longest_jank_free_task_duration; |
| |
| main_thread_only().timer_tasks_seem_expensive = timer_tasks_seem_expensive; |
| main_thread_only().loading_tasks_seem_expensive = |
| loading_tasks_seem_expensive; |
| |
| // The |new_policy_duration| is the minimum of |expected_use_case_duration| |
| // and |touchstart_expected_flag_valid_for_duration| unless one is zero in |
| // which case we choose the other. |
| base::TimeDelta new_policy_duration = expected_use_case_duration; |
| if (new_policy_duration.is_zero() || |
| (touchstart_expected_flag_valid_for_duration > base::TimeDelta() && |
| new_policy_duration > touchstart_expected_flag_valid_for_duration)) { |
| new_policy_duration = touchstart_expected_flag_valid_for_duration; |
| } |
| |
| bool previously_frozen_when_backgrounded = |
| main_thread_only().frozen_when_backgrounded; |
| bool newly_frozen = false; |
| if (main_thread_only().renderer_backgrounded && |
| main_thread_only().freezing_when_backgrounded_enabled) { |
| base::TimeTicks stop_at = main_thread_only().background_status_changed_at + |
| delay_for_background_tab_freezing_; |
| |
| newly_frozen = !main_thread_only().frozen_when_backgrounded; |
| main_thread_only().frozen_when_backgrounded = now >= stop_at; |
| newly_frozen &= main_thread_only().frozen_when_backgrounded; |
| |
| if (!main_thread_only().frozen_when_backgrounded) |
| UpdatePolicyDuration(now, stop_at, &new_policy_duration); |
| } else { |
| main_thread_only().frozen_when_backgrounded = false; |
| } |
| |
| if (new_policy_duration > base::TimeDelta()) { |
| main_thread_only().current_policy_expiration_time = |
| now + new_policy_duration; |
| delayed_update_policy_runner_.SetDeadline(FROM_HERE, new_policy_duration, |
| now); |
| } else { |
| main_thread_only().current_policy_expiration_time = base::TimeTicks(); |
| } |
| |
| // Avoid prioritizing main thread compositing (e.g., rAF) if it is extremely |
| // slow, because that can cause starvation in other task sources. |
| bool main_thread_compositing_is_fast = |
| main_thread_only().idle_time_estimator.GetExpectedIdleDuration( |
| main_thread_only().compositor_frame_interval) > |
| main_thread_only().compositor_frame_interval * |
| kFastCompositingIdleTimeThreshold; |
| |
| Policy new_policy; |
| ExpensiveTaskPolicy expensive_task_policy = ExpensiveTaskPolicy::kRun; |
| new_policy.rail_mode() = v8::PERFORMANCE_ANIMATION; |
| |
| switch (use_case) { |
| case UseCase::kCompositorGesture: |
| if (touchstart_expected_soon) { |
| new_policy.rail_mode() = v8::PERFORMANCE_RESPONSE; |
| expensive_task_policy = ExpensiveTaskPolicy::kBlock; |
| new_policy.compositor_queue_policy().priority = |
| TaskQueue::kHighestPriority; |
| } else { |
| // What we really want to do is priorize loading tasks, but that doesn't |
| // seem to be safe. Instead we do that by proxy by deprioritizing |
| // compositor tasks. This should be safe since we've already gone to the |
| // pain of fixing ordering issues with them. |
| new_policy.compositor_queue_policy().priority = TaskQueue::kLowPriority; |
| } |
| break; |
| |
| case UseCase::kSynchronizedGesture: |
| new_policy.compositor_queue_policy().priority = |
| main_thread_compositing_is_fast ? TaskQueue::kHighestPriority |
| : TaskQueue::kNormalPriority; |
| if (touchstart_expected_soon) { |
| new_policy.rail_mode() = v8::PERFORMANCE_RESPONSE; |
| expensive_task_policy = ExpensiveTaskPolicy::kBlock; |
| } else { |
| expensive_task_policy = ExpensiveTaskPolicy::kThrottle; |
| } |
| break; |
| |
| case UseCase::kMainThreadCustomInputHandling: |
| // In main thread input handling scenarios we don't have perfect knowledge |
| // about which things we should be prioritizing, so we don't attempt to |
| // block expensive tasks because we don't know whether they were integral |
| // to the page's functionality or not. |
| new_policy.compositor_queue_policy().priority = |
| main_thread_compositing_is_fast ? TaskQueue::kHighestPriority |
| : TaskQueue::kNormalPriority; |
| break; |
| |
| case UseCase::kMainThreadGesture: |
| // A main thread gesture is for example a scroll gesture which is handled |
| // by the main thread. Since we know the established gesture type, we can |
| // be a little more aggressive about prioritizing compositing and input |
| // handling over other tasks. |
| new_policy.compositor_queue_policy().priority = |
| TaskQueue::kHighestPriority; |
| if (touchstart_expected_soon) { |
| new_policy.rail_mode() = v8::PERFORMANCE_RESPONSE; |
| expensive_task_policy = ExpensiveTaskPolicy::kBlock; |
| } else { |
| expensive_task_policy = ExpensiveTaskPolicy::kThrottle; |
| } |
| break; |
| |
| case UseCase::kTouchstart: |
| new_policy.rail_mode() = v8::PERFORMANCE_RESPONSE; |
| new_policy.compositor_queue_policy().priority = |
| TaskQueue::kHighestPriority; |
| new_policy.loading_queue_policy().is_blocked = true; |
| new_policy.timer_queue_policy().is_blocked = true; |
| // NOTE this is a nop due to the above. |
| expensive_task_policy = ExpensiveTaskPolicy::kBlock; |
| break; |
| |
| case UseCase::kNone: |
| // It's only safe to block tasks that if we are expecting a compositor |
| // driven gesture. |
| if (touchstart_expected_soon && |
| any_thread().last_gesture_was_compositor_driven) { |
| new_policy.rail_mode() = v8::PERFORMANCE_RESPONSE; |
| expensive_task_policy = ExpensiveTaskPolicy::kBlock; |
| } |
| break; |
| |
| case UseCase::kLoading: |
| new_policy.rail_mode() = v8::PERFORMANCE_LOAD; |
| // TODO(skyostil): Experiment with increasing loading and default queue |
| // priorities and throttling rendering frame rate. |
| break; |
| |
| default: |
| NOTREACHED(); |
| } |
| |
| // TODO(skyostil): Add an idle state for foreground tabs too. |
| if (main_thread_only().renderer_hidden) |
| new_policy.rail_mode() = v8::PERFORMANCE_IDLE; |
| |
| if (expensive_task_policy == ExpensiveTaskPolicy::kBlock && |
| (!main_thread_only().have_seen_a_begin_main_frame || |
| main_thread_only().navigation_task_expected_count > 0)) { |
| expensive_task_policy = ExpensiveTaskPolicy::kRun; |
| } |
| |
| switch (expensive_task_policy) { |
| case ExpensiveTaskPolicy::kRun: |
| break; |
| |
| case ExpensiveTaskPolicy::kBlock: |
| if (loading_tasks_seem_expensive) |
| new_policy.loading_queue_policy().is_blocked = true; |
| if (timer_tasks_seem_expensive) |
| new_policy.timer_queue_policy().is_blocked = true; |
| break; |
| |
| case ExpensiveTaskPolicy::kThrottle: |
| if (loading_tasks_seem_expensive) { |
| new_policy.loading_queue_policy().is_throttled = true; |
| } |
| if (timer_tasks_seem_expensive) { |
| new_policy.timer_queue_policy().is_throttled = true; |
| } |
| break; |
| } |
| main_thread_only().expensive_task_policy = expensive_task_policy; |
| |
| if (main_thread_only().frozen_when_backgrounded) { |
| // TODO(panicker): Remove this, as it is controlled at |
| // FrameScheduler. This is currently needed to avoid early out. |
| new_policy.timer_queue_policy().is_frozen = true; |
| } |
| |
| if (main_thread_only().renderer_pause_count != 0) { |
| new_policy.loading_queue_policy().is_paused = true; |
| new_policy.timer_queue_policy().is_paused = true; |
| } |
| if (main_thread_only().pause_timers_for_webview) { |
| new_policy.timer_queue_policy().is_paused = true; |
| } |
| |
| if (main_thread_only().renderer_backgrounded && |
| RuntimeEnabledFeatures::TimerThrottlingForBackgroundTabsEnabled()) { |
| new_policy.timer_queue_policy().is_throttled = true; |
| } |
| |
| if (main_thread_only().use_virtual_time) { |
| new_policy.compositor_queue_policy().use_virtual_time = true; |
| new_policy.default_queue_policy().use_virtual_time = true; |
| new_policy.loading_queue_policy().use_virtual_time = true; |
| new_policy.timer_queue_policy().use_virtual_time = true; |
| } |
| |
| new_policy.should_disable_throttling() = |
| main_thread_only().use_virtual_time; |
| |
| // Tracing is done before the early out check, because it's quite possible we |
| // will otherwise miss this information in traces. |
| CreateTraceEventObjectSnapshotLocked(); |
| |
| // TODO(alexclarke): Can we get rid of force update now? |
| if (update_type == UpdateType::kMayEarlyOutIfPolicyUnchanged && |
| new_policy == main_thread_only().current_policy) { |
| return; |
| } |
| |
| for (const auto& pair : task_runners_) { |
| MainThreadTaskQueue::QueueClass queue_class = pair.first->queue_class(); |
| |
| ApplyTaskQueuePolicy( |
| pair.first.get(), pair.second.get(), |
| main_thread_only().current_policy.GetQueuePolicy(queue_class), |
| new_policy.GetQueuePolicy(queue_class)); |
| } |
| |
| main_thread_only().rail_mode_for_tracing = new_policy.rail_mode(); |
| if (main_thread_only().rail_mode_observer && |
| new_policy.rail_mode() != main_thread_only().current_policy.rail_mode()) { |
| main_thread_only().rail_mode_observer->OnRAILModeChanged( |
| new_policy.rail_mode()); |
| } |
| |
| // TODO(skyostil): send these notifications after releasing the scheduler |
| // lock. |
| if (main_thread_only().freezing_when_backgrounded_enabled) { |
| if (main_thread_only().frozen_when_backgrounded != |
| previously_frozen_when_backgrounded) { |
| SetFrozenInBackground(main_thread_only().frozen_when_backgrounded); |
| MainThreadMetricsHelper::RecordBackgroundedTransition( |
| main_thread_only().frozen_when_backgrounded |
| ? BackgroundedRendererTransition::kFrozenAfterDelay |
| : BackgroundedRendererTransition::kResumed); |
| } |
| } |
| |
| if (new_policy.should_disable_throttling() != |
| main_thread_only().current_policy.should_disable_throttling()) { |
| if (new_policy.should_disable_throttling()) { |
| task_queue_throttler()->DisableThrottling(); |
| } else { |
| task_queue_throttler()->EnableThrottling(); |
| } |
| } |
| |
| DCHECK(compositor_task_queue_->IsQueueEnabled()); |
| main_thread_only().current_policy = new_policy; |
| |
| if (newly_frozen) |
| Platform::Current()->RequestPurgeMemory(); |
| } |
| |
| void MainThreadSchedulerImpl::ApplyTaskQueuePolicy( |
| MainThreadTaskQueue* task_queue, |
| TaskQueue::QueueEnabledVoter* task_queue_enabled_voter, |
| const TaskQueuePolicy& old_task_queue_policy, |
| const TaskQueuePolicy& new_task_queue_policy) const { |
| DCHECK(old_task_queue_policy.IsQueueEnabled(task_queue) || |
| task_queue_enabled_voter); |
| if (task_queue_enabled_voter) { |
| task_queue_enabled_voter->SetQueueEnabled( |
| new_task_queue_policy.IsQueueEnabled(task_queue)); |
| } |
| |
| // Make sure if there's no voter that the task queue is enabled. |
| DCHECK(task_queue_enabled_voter || |
| old_task_queue_policy.IsQueueEnabled(task_queue)); |
| |
| task_queue->SetQueuePriority(new_task_queue_policy.GetPriority(task_queue)); |
| |
| TimeDomainType old_time_domain_type = |
| old_task_queue_policy.GetTimeDomainType(task_queue); |
| TimeDomainType new_time_domain_type = |
| new_task_queue_policy.GetTimeDomainType(task_queue); |
| |
| if (old_time_domain_type != new_time_domain_type) { |
| if (old_time_domain_type == TimeDomainType::kThrottled) { |
| task_queue_throttler_->DecreaseThrottleRefCount(task_queue); |
| } else if (new_time_domain_type == TimeDomainType::kThrottled) { |
| task_queue_throttler_->IncreaseThrottleRefCount(task_queue); |
| } |
| if (new_time_domain_type == TimeDomainType::kVirtual) { |
| DCHECK(virtual_time_domain_); |
| task_queue->SetTimeDomain(virtual_time_domain_.get()); |
| } else { |
| task_queue->SetTimeDomain(real_time_domain()); |
| } |
| } |
| } |
| |
| UseCase MainThreadSchedulerImpl::ComputeCurrentUseCase( |
| base::TimeTicks now, |
| base::TimeDelta* expected_use_case_duration) const { |
| any_thread_lock_.AssertAcquired(); |
| // Special case for flings. This is needed because we don't get notification |
| // of a fling ending (although we do for cancellation). |
| if (any_thread().fling_compositor_escalation_deadline > now && |
| !any_thread().awaiting_touch_start_response) { |
| *expected_use_case_duration = |
| any_thread().fling_compositor_escalation_deadline - now; |
| return UseCase::kCompositorGesture; |
| } |
| // Above all else we want to be responsive to user input. |
| *expected_use_case_duration = |
| any_thread().user_model.TimeLeftInUserGesture(now); |
| if (*expected_use_case_duration > base::TimeDelta()) { |
| // Has a gesture been fully established? |
| if (any_thread().awaiting_touch_start_response) { |
| // No, so arrange for compositor tasks to be run at the highest priority. |
| return UseCase::kTouchstart; |
| } |
| |
| // Yes a gesture has been established. Based on how the gesture is handled |
| // we need to choose between one of four use cases: |
| // 1. kCompositorGesture where the gesture is processed only on the |
| // compositor thread. |
| // 2. MAIN_THREAD_GESTURE where the gesture is processed only on the main |
| // thread. |
| // 3. MAIN_THREAD_CUSTOM_INPUT_HANDLING where the main thread processes a |
| // stream of input events and has prevented a default gesture from being |
| // started. |
| // 4. SYNCHRONIZED_GESTURE where the gesture is processed on both threads. |
| if (any_thread().last_gesture_was_compositor_driven) { |
| if (any_thread().begin_main_frame_on_critical_path) { |
| return UseCase::kSynchronizedGesture; |
| } else { |
| return UseCase::kCompositorGesture; |
| } |
| } |
| if (any_thread().default_gesture_prevented) { |
| return UseCase::kMainThreadCustomInputHandling; |
| } else { |
| return UseCase::kMainThreadGesture; |
| } |
| } |
| |
| // Occasionally the meaningful paint fails to be detected, so as a fallback we |
| // treat the presence of input as an indirect signal that there is meaningful |
| // content on the page. |
| if (any_thread().waiting_for_meaningful_paint && |
| !any_thread().have_seen_input_since_navigation) { |
| return UseCase::kLoading; |
| } |
| return UseCase::kNone; |
| } |
| |
| base::TimeDelta MainThreadSchedulerImpl::EstimateLongestJankFreeTaskDuration() |
| const { |
| switch (main_thread_only().current_use_case) { |
| case UseCase::kTouchstart: |
| case UseCase::kCompositorGesture: |
| case UseCase::kLoading: |
| case UseCase::kNone: |
| return base::TimeDelta::FromMilliseconds(kRailsResponseTimeMillis); |
| |
| case UseCase::kMainThreadCustomInputHandling: |
| case UseCase::kMainThreadGesture: |
| case UseCase::kSynchronizedGesture: |
| return main_thread_only().idle_time_estimator.GetExpectedIdleDuration( |
| main_thread_only().compositor_frame_interval); |
| |
| default: |
| NOTREACHED(); |
| return base::TimeDelta::FromMilliseconds(kRailsResponseTimeMillis); |
| } |
| } |
| |
| bool MainThreadSchedulerImpl::CanEnterLongIdlePeriod( |
| base::TimeTicks now, |
| base::TimeDelta* next_long_idle_period_delay_out) { |
| helper_.CheckOnValidThread(); |
| |
| MaybeUpdatePolicy(); |
| if (main_thread_only().current_use_case == UseCase::kTouchstart) { |
| // Don't start a long idle task in touch start priority, try again when |
| // the policy is scheduled to end. |
| *next_long_idle_period_delay_out = |
| std::max(base::TimeDelta(), |
| main_thread_only().current_policy_expiration_time - now); |
| return false; |
| } |
| return true; |
| } |
| |
| void MainThreadSchedulerImpl::SetFrozenInBackground(bool frozen) const { |
| for (PageSchedulerImpl* page_scheduler : main_thread_only().page_schedulers) { |
| // This moves the page to FROZEN lifecycle state. |
| page_scheduler->SetPageFrozen(frozen); |
| } |
| } |
| |
| MainThreadSchedulerHelper* |
| MainThreadSchedulerImpl::GetSchedulerHelperForTesting() { |
| return &helper_; |
| } |
| |
| TaskCostEstimator* |
| MainThreadSchedulerImpl::GetLoadingTaskCostEstimatorForTesting() { |
| return &main_thread_only().loading_task_cost_estimator; |
| } |
| |
| TaskCostEstimator* |
| MainThreadSchedulerImpl::GetTimerTaskCostEstimatorForTesting() { |
| return &main_thread_only().timer_task_cost_estimator; |
| } |
| |
| IdleTimeEstimator* MainThreadSchedulerImpl::GetIdleTimeEstimatorForTesting() { |
| return &main_thread_only().idle_time_estimator; |
| } |
| |
| WakeUpBudgetPool* MainThreadSchedulerImpl::GetWakeUpBudgetPoolForTesting() { |
| return main_thread_only().wake_up_budget_pool; |
| } |
| |
| base::TimeTicks MainThreadSchedulerImpl::EnableVirtualTime() { |
| return EnableVirtualTime(main_thread_only().initial_virtual_time.is_null() |
| ? BaseTimeOverridePolicy::DO_NOT_OVERRIDE |
| : BaseTimeOverridePolicy::OVERRIDE); |
| } |
| |
| base::TimeTicks MainThreadSchedulerImpl::EnableVirtualTime( |
| BaseTimeOverridePolicy policy) { |
| if (main_thread_only().use_virtual_time) |
| return main_thread_only().initial_virtual_time_ticks; |
| main_thread_only().use_virtual_time = true; |
| DCHECK(!virtual_time_domain_); |
| if (main_thread_only().initial_virtual_time.is_null()) |
| main_thread_only().initial_virtual_time = base::Time::Now(); |
| if (main_thread_only().initial_virtual_time_ticks.is_null()) |
| main_thread_only().initial_virtual_time_ticks = tick_clock()->NowTicks(); |
| virtual_time_domain_.reset(new AutoAdvancingVirtualTimeDomain( |
| main_thread_only().initial_virtual_time + |
| main_thread_only().initial_virtual_time_offset, |
| main_thread_only().initial_virtual_time_ticks + |
| main_thread_only().initial_virtual_time_offset, |
| &helper_, policy)); |
| RegisterTimeDomain(virtual_time_domain_.get()); |
| virtual_time_domain_->SetObserver(this); |
| |
| DCHECK(!virtual_time_control_task_queue_); |
| virtual_time_control_task_queue_ = |
| helper_.NewTaskQueue(MainThreadTaskQueue::QueueCreationParams( |
| MainThreadTaskQueue::QueueType::kControl)); |
| virtual_time_control_task_queue_->SetQueuePriority( |
| TaskQueue::kControlPriority); |
| virtual_time_control_task_queue_->SetTimeDomain(virtual_time_domain_.get()); |
| |
| main_thread_only().use_virtual_time = true; |
| ForceUpdatePolicy(); |
| |
| virtual_time_domain_->SetCanAdvanceVirtualTime( |
| !main_thread_only().virtual_time_stopped); |
| |
| if (main_thread_only().virtual_time_stopped) |
| VirtualTimePaused(); |
| return main_thread_only().initial_virtual_time_ticks; |
| } |
| |
| bool MainThreadSchedulerImpl::IsVirtualTimeEnabled() const { |
| return main_thread_only().use_virtual_time; |
| } |
| |
| void MainThreadSchedulerImpl::DisableVirtualTimeForTesting() { |
| if (!main_thread_only().use_virtual_time) |
| return; |
| // Reset virtual time and all tasks queues back to their initial state. |
| main_thread_only().use_virtual_time = false; |
| |
| if (main_thread_only().virtual_time_stopped) { |
| main_thread_only().virtual_time_stopped = false; |
| VirtualTimeResumed(); |
| } |
| |
| ForceUpdatePolicy(); |
| |
| virtual_time_control_task_queue_->ShutdownTaskQueue(); |
| virtual_time_control_task_queue_ = nullptr; |
| UnregisterTimeDomain(virtual_time_domain_.get()); |
| virtual_time_domain_.reset(); |
| virtual_time_control_task_queue_ = nullptr; |
| ApplyVirtualTimePolicy(); |
| |
| // Reset the MetricsHelper because it gets confused by time going backwards. |
| base::TimeTicks now = tick_clock()->NowTicks(); |
| main_thread_only().metrics_helper.ResetForTest(now); |
| } |
| |
| void MainThreadSchedulerImpl::SetVirtualTimeStopped(bool virtual_time_stopped) { |
| if (main_thread_only().virtual_time_stopped == virtual_time_stopped) |
| return; |
| main_thread_only().virtual_time_stopped = virtual_time_stopped; |
| |
| if (!main_thread_only().use_virtual_time) |
| return; |
| |
| virtual_time_domain_->SetCanAdvanceVirtualTime(!virtual_time_stopped); |
| |
| if (virtual_time_stopped) { |
| VirtualTimePaused(); |
| } else { |
| VirtualTimeResumed(); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::VirtualTimePaused() { |
| for (const auto& pair : task_runners_) { |
| if (pair.first->queue_class() == MainThreadTaskQueue::QueueClass::kTimer) { |
| DCHECK(!task_queue_throttler_->IsThrottled(pair.first.get())); |
| pair.first->InsertFence(TaskQueue::InsertFencePosition::kNow); |
| } |
| } |
| for (auto& observer : main_thread_only().virtual_time_observers) { |
| observer.OnVirtualTimePaused(virtual_time_domain_->Now() - |
| main_thread_only().initial_virtual_time_ticks); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::VirtualTimeResumed() { |
| for (const auto& pair : task_runners_) { |
| if (pair.first->queue_class() == MainThreadTaskQueue::QueueClass::kTimer) { |
| DCHECK(!task_queue_throttler_->IsThrottled(pair.first.get())); |
| DCHECK(pair.first->HasActiveFence()); |
| pair.first->RemoveFence(); |
| } |
| } |
| } |
| |
| bool MainThreadSchedulerImpl::VirtualTimeAllowedToAdvance() const { |
| return !main_thread_only().virtual_time_stopped; |
| } |
| |
| base::TimeTicks MainThreadSchedulerImpl::IncrementVirtualTimePauseCount() { |
| main_thread_only().virtual_time_pause_count++; |
| ApplyVirtualTimePolicy(); |
| |
| if (virtual_time_domain_) |
| return virtual_time_domain_->Now(); |
| return tick_clock()->NowTicks(); |
| } |
| |
| void MainThreadSchedulerImpl::DecrementVirtualTimePauseCount() { |
| main_thread_only().virtual_time_pause_count--; |
| DCHECK_GE(main_thread_only().virtual_time_pause_count, 0); |
| ApplyVirtualTimePolicy(); |
| } |
| |
| void MainThreadSchedulerImpl::MaybeAdvanceVirtualTime( |
| base::TimeTicks new_virtual_time) { |
| if (virtual_time_domain_) |
| virtual_time_domain_->MaybeAdvanceVirtualTime(new_virtual_time); |
| } |
| |
| void MainThreadSchedulerImpl::SetVirtualTimePolicy(VirtualTimePolicy policy) { |
| main_thread_only().virtual_time_policy = policy; |
| ApplyVirtualTimePolicy(); |
| } |
| |
| void MainThreadSchedulerImpl::SetInitialVirtualTime(base::Time time) { |
| main_thread_only().initial_virtual_time = time; |
| } |
| |
| void MainThreadSchedulerImpl::SetInitialVirtualTimeOffset( |
| base::TimeDelta offset) { |
| main_thread_only().initial_virtual_time_offset = offset; |
| } |
| |
| void MainThreadSchedulerImpl::AddVirtualTimeObserver( |
| VirtualTimeObserver* observer) { |
| main_thread_only().virtual_time_observers.AddObserver(observer); |
| } |
| |
| void MainThreadSchedulerImpl::RemoveVirtualTimeObserver( |
| VirtualTimeObserver* observer) { |
| main_thread_only().virtual_time_observers.RemoveObserver(observer); |
| } |
| |
| void MainThreadSchedulerImpl::OnVirtualTimeAdvanced() { |
| for (auto& observer : main_thread_only().virtual_time_observers) { |
| observer.OnVirtualTimeAdvanced( |
| virtual_time_domain_->Now() - |
| main_thread_only().initial_virtual_time_ticks); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::ApplyVirtualTimePolicy() { |
| switch (main_thread_only().virtual_time_policy) { |
| case VirtualTimePolicy::kAdvance: |
| if (virtual_time_domain_) { |
| virtual_time_domain_->SetMaxVirtualTimeTaskStarvationCount( |
| main_thread_only().nested_runloop |
| ? 0 |
| : main_thread_only().max_virtual_time_task_starvation_count); |
| virtual_time_domain_->SetVirtualTimeFence(base::TimeTicks()); |
| } |
| SetVirtualTimeStopped(false); |
| break; |
| case VirtualTimePolicy::kPause: |
| if (virtual_time_domain_) { |
| virtual_time_domain_->SetMaxVirtualTimeTaskStarvationCount(0); |
| virtual_time_domain_->SetVirtualTimeFence(virtual_time_domain_->Now()); |
| } |
| SetVirtualTimeStopped(true); |
| break; |
| case VirtualTimePolicy::kDeterministicLoading: |
| if (virtual_time_domain_) { |
| virtual_time_domain_->SetMaxVirtualTimeTaskStarvationCount( |
| main_thread_only().nested_runloop |
| ? 0 |
| : main_thread_only().max_virtual_time_task_starvation_count); |
| } |
| |
| // We pause virtual time while the run loop is nested because that implies |
| // something modal is happening such as the DevTools debugger pausing the |
| // system. We also pause while the renderer is waiting for various |
| // asynchronous things e.g. resource load or navigation. |
| SetVirtualTimeStopped(main_thread_only().virtual_time_pause_count != 0 || |
| main_thread_only().nested_runloop); |
| break; |
| } |
| } |
| |
| void MainThreadSchedulerImpl::SetMaxVirtualTimeTaskStarvationCount( |
| int max_task_starvation_count) { |
| main_thread_only().max_virtual_time_task_starvation_count = |
| max_task_starvation_count; |
| ApplyVirtualTimePolicy(); |
| } |
| |
| void MainThreadSchedulerImpl::SetFreezingWhenBackgroundedEnabled(bool enabled) { |
| // Note that this will only take effect for the next backgrounded signal. |
| main_thread_only().freezing_when_backgrounded_enabled = enabled; |
| } |
| |
| std::unique_ptr<base::trace_event::ConvertableToTraceFormat> |
| MainThreadSchedulerImpl::AsValue(base::TimeTicks optional_now) const { |
| base::AutoLock lock(any_thread_lock_); |
| return AsValueLocked(optional_now); |
| } |
| |
| void MainThreadSchedulerImpl::CreateTraceEventObjectSnapshot() const { |
| TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID( |
| TRACE_DISABLED_BY_DEFAULT("renderer.scheduler.debug"), |
| "MainThreadScheduler", this, AsValue(helper_.NowTicks())); |
| } |
| |
| void MainThreadSchedulerImpl::CreateTraceEventObjectSnapshotLocked() const { |
| TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID( |
| TRACE_DISABLED_BY_DEFAULT("renderer.scheduler.debug"), |
| "MainThreadScheduler", this, AsValueLocked(helper_.NowTicks())); |
| } |
| |
| // static |
| const char* MainThreadSchedulerImpl::ExpensiveTaskPolicyToString( |
| ExpensiveTaskPolicy expensive_task_policy) { |
| switch (expensive_task_policy) { |
| case ExpensiveTaskPolicy::kRun: |
| return "run"; |
| case ExpensiveTaskPolicy::kBlock: |
| return "block"; |
| case ExpensiveTaskPolicy::kThrottle: |
| return "throttle"; |
| default: |
| NOTREACHED(); |
| return nullptr; |
| } |
| } |
| |
| std::unique_ptr<base::trace_event::ConvertableToTraceFormat> |
| MainThreadSchedulerImpl::AsValueLocked(base::TimeTicks optional_now) const { |
| helper_.CheckOnValidThread(); |
| any_thread_lock_.AssertAcquired(); |
| |
| if (optional_now.is_null()) |
| optional_now = helper_.NowTicks(); |
| std::unique_ptr<base::trace_event::TracedValue> state( |
| new base::trace_event::TracedValue()); |
| state->SetBoolean( |
| "has_visible_render_widget_with_touch_handler", |
| main_thread_only().has_visible_render_widget_with_touch_handler); |
| state->SetString("current_use_case", |
| UseCaseToString(main_thread_only().current_use_case)); |
| state->SetBoolean("loading_tasks_seem_expensive", |
| main_thread_only().loading_tasks_seem_expensive); |
| state->SetBoolean("timer_tasks_seem_expensive", |
| main_thread_only().timer_tasks_seem_expensive); |
| state->SetBoolean("begin_frame_not_expected_soon", |
| main_thread_only().begin_frame_not_expected_soon); |
| state->SetBoolean( |
| "compositor_will_send_main_frame_not_expected", |
| main_thread_only().compositor_will_send_main_frame_not_expected); |
| state->SetBoolean("touchstart_expected_soon", |
| main_thread_only().touchstart_expected_soon); |
| state->SetString("idle_period_state", |
| IdleHelper::IdlePeriodStateToString( |
| idle_helper_.SchedulerIdlePeriodState())); |
| state->SetBoolean("renderer_hidden", main_thread_only().renderer_hidden); |
| state->SetBoolean("have_seen_a_begin_main_frame", |
| main_thread_only().have_seen_a_begin_main_frame); |
| state->SetBoolean("waiting_for_meaningful_paint", |
| any_thread().waiting_for_meaningful_paint); |
| state->SetBoolean("have_seen_input_since_navigation", |
| any_thread().have_seen_input_since_navigation); |
| state->SetBoolean( |
| "have_reported_blocking_intervention_in_current_policy", |
| main_thread_only().have_reported_blocking_intervention_in_current_policy); |
| state->SetBoolean( |
| "have_reported_blocking_intervention_since_navigation", |
| main_thread_only().have_reported_blocking_intervention_since_navigation); |
| state->SetBoolean("renderer_backgrounded", |
| main_thread_only().renderer_backgrounded); |
| state->SetBoolean("keep_active_fetch_or_worker", |
| main_thread_only().keep_active_fetch_or_worker); |
| state->SetBoolean("frozen_when_backgrounded", |
| main_thread_only().frozen_when_backgrounded); |
| state->SetDouble("now", (optional_now - base::TimeTicks()).InMillisecondsF()); |
| state->SetDouble( |
| "fling_compositor_escalation_deadline", |
| (any_thread().fling_compositor_escalation_deadline - base::TimeTicks()) |
| .InMillisecondsF()); |
| state->SetInteger("navigation_task_expected_count", |
| main_thread_only().navigation_task_expected_count); |
| state->SetDouble("last_idle_period_end_time", |
| (any_thread().last_idle_period_end_time - base::TimeTicks()) |
| .InMillisecondsF()); |
| state->SetBoolean("awaiting_touch_start_response", |
| any_thread().awaiting_touch_start_response); |
| state->SetBoolean("begin_main_frame_on_critical_path", |
| any_thread().begin_main_frame_on_critical_path); |
| state->SetBoolean("last_gesture_was_compositor_driven", |
| any_thread().last_gesture_was_compositor_driven); |
| state->SetBoolean("default_gesture_prevented", |
| any_thread().default_gesture_prevented); |
| state->SetDouble("expected_loading_task_duration", |
| main_thread_only() |
| .loading_task_cost_estimator.expected_task_duration() |
| .InMillisecondsF()); |
| state->SetDouble("expected_timer_task_duration", |
| main_thread_only() |
| .timer_task_cost_estimator.expected_task_duration() |
| .InMillisecondsF()); |
| state->SetBoolean("is_audio_playing", main_thread_only().is_audio_playing); |
| state->SetBoolean("virtual_time_stopped", |
| main_thread_only().virtual_time_stopped); |
| state->SetDouble("virtual_time_pause_count", |
| main_thread_only().virtual_time_pause_count); |
| state->SetString( |
| "virtual_time_policy", |
| VirtualTimePolicyToString(main_thread_only().virtual_time_policy)); |
| state->SetBoolean("virtual_time", main_thread_only().use_virtual_time); |
| |
| state->BeginDictionary("page_schedulers"); |
| for (PageSchedulerImpl* page_scheduler : main_thread_only().page_schedulers) { |
| state->BeginDictionaryWithCopiedName(PointerToString(page_scheduler)); |
| page_scheduler->AsValueInto(state.get()); |
| state->EndDictionary(); |
| } |
| state->EndDictionary(); |
| |
| state->BeginDictionary("policy"); |
| main_thread_only().current_policy.AsValueInto(state.get()); |
| state->EndDictionary(); |
| |
| // TODO(skyostil): Can we somehow trace how accurate these estimates were? |
| state->SetDouble( |
| "longest_jank_free_task_duration", |
| main_thread_only().longest_jank_free_task_duration->InMillisecondsF()); |
| state->SetDouble( |
| "compositor_frame_interval", |
| main_thread_only().compositor_frame_interval.InMillisecondsF()); |
| state->SetDouble( |
| "estimated_next_frame_begin", |
| (main_thread_only().estimated_next_frame_begin - base::TimeTicks()) |
| .InMillisecondsF()); |
| state->SetBoolean("in_idle_period", any_thread().in_idle_period); |
| |
| state->SetString( |
| "expensive_task_policy", |
| ExpensiveTaskPolicyToString(main_thread_only().expensive_task_policy)); |
| |
| any_thread().user_model.AsValueInto(state.get()); |
| render_widget_scheduler_signals_.AsValueInto(state.get()); |
| |
| state->BeginDictionary("task_queue_throttler"); |
| task_queue_throttler_->AsValueInto(state.get(), optional_now); |
| state->EndDictionary(); |
| |
| return std::move(state); |
| } |
| |
| bool MainThreadSchedulerImpl::TaskQueuePolicy::IsQueueEnabled( |
| MainThreadTaskQueue* task_queue) const { |
| if (!is_enabled) |
| return false; |
| if (is_paused && task_queue->CanBePaused()) |
| return false; |
| if (is_blocked && task_queue->CanBeDeferred()) |
| return false; |
| // TODO(panicker): Remove this, as it is redundant as we stop per-frame |
| // task_queues in WebFrameScheduler |
| if (is_frozen && task_queue->CanBeFrozen()) |
| return false; |
| return true; |
| } |
| |
| TaskQueue::QueuePriority MainThreadSchedulerImpl::TaskQueuePolicy::GetPriority( |
| MainThreadTaskQueue* task_queue) const { |
| base::Optional<TaskQueue::QueuePriority> fixed_priority = |
| task_queue->FixedPriority(); |
| if (fixed_priority) |
| return fixed_priority.value(); |
| return task_queue->UsedForImportantTasks() ? TaskQueue::kHighestPriority |
| : priority; |
| } |
| |
| MainThreadSchedulerImpl::TimeDomainType |
| MainThreadSchedulerImpl::TaskQueuePolicy::GetTimeDomainType( |
| MainThreadTaskQueue* task_queue) const { |
| if (use_virtual_time) |
| return TimeDomainType::kVirtual; |
| if (is_throttled && task_queue->CanBeThrottled()) |
| return TimeDomainType::kThrottled; |
| return TimeDomainType::kReal; |
| } |
| |
| void MainThreadSchedulerImpl::TaskQueuePolicy::AsValueInto( |
| base::trace_event::TracedValue* state) const { |
| state->SetBoolean("is_enabled", is_enabled); |
| state->SetBoolean("is_paused", is_paused); |
| state->SetBoolean("is_throttled", is_throttled); |
| state->SetBoolean("is_blocked", is_blocked); |
| state->SetBoolean("is_frozen", is_frozen); |
| state->SetBoolean("use_virtual_time", use_virtual_time); |
| state->SetString("priority", TaskQueue::PriorityToString(priority)); |
| } |
| |
| void MainThreadSchedulerImpl::Policy::AsValueInto( |
| base::trace_event::TracedValue* state) const { |
| state->BeginDictionary("compositor_queue_policy"); |
| compositor_queue_policy().AsValueInto(state); |
| state->EndDictionary(); |
| |
| state->BeginDictionary("loading_queue_policy"); |
| loading_queue_policy().AsValueInto(state); |
| state->EndDictionary(); |
| |
| state->BeginDictionary("timer_queue_policy"); |
| timer_queue_policy().AsValueInto(state); |
| state->EndDictionary(); |
| |
| state->BeginDictionary("default_queue_policy"); |
| default_queue_policy().AsValueInto(state); |
| state->EndDictionary(); |
| |
| state->SetString("rail_mode", RAILModeToString(rail_mode())); |
| state->SetBoolean("should_disable_throttling", should_disable_throttling()); |
| } |
| |
| void MainThreadSchedulerImpl::OnIdlePeriodStarted() { |
| base::AutoLock lock(any_thread_lock_); |
| any_thread().in_idle_period = true; |
| UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged); |
| } |
| |
| void MainThreadSchedulerImpl::OnIdlePeriodEnded() { |
| base::AutoLock lock(any_thread_lock_); |
| any_thread().last_idle_period_end_time = helper_.NowTicks(); |
| any_thread().in_idle_period = false; |
| UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged); |
| } |
| |
| void MainThreadSchedulerImpl::OnPendingTasksChanged(bool has_tasks) { |
| if (has_tasks == |
| main_thread_only().compositor_will_send_main_frame_not_expected.get()) |
| return; |
| |
| // Dispatch RequestBeginMainFrameNotExpectedSoon notifications asynchronously. |
| // This is needed because idle task can be posted (and OnPendingTasksChanged |
| // called) at any moment, including in the middle of allocating an object, |
| // when state is not consistent. Posting a task to dispatch notifications |
| // minimizes the amount of code that runs and sees an inconsistent state . |
| control_task_queue_->PostTask( |
| FROM_HERE, |
| base::BindOnce( |
| &MainThreadSchedulerImpl::DispatchRequestBeginMainFrameNotExpected, |
| weak_factory_.GetWeakPtr(), has_tasks)); |
| } |
| |
| void MainThreadSchedulerImpl::DispatchRequestBeginMainFrameNotExpected( |
| bool has_tasks) { |
| if (has_tasks == |
| main_thread_only().compositor_will_send_main_frame_not_expected.get()) |
| return; |
| main_thread_only().compositor_will_send_main_frame_not_expected = has_tasks; |
| |
| TRACE_EVENT1( |
| TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::DispatchRequestBeginMainFrameNotExpected", |
| "has_tasks", has_tasks); |
| for (PageSchedulerImpl* page_scheduler : main_thread_only().page_schedulers) { |
| page_scheduler->RequestBeginMainFrameNotExpected(has_tasks); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::AddPendingNavigation(NavigatingFrameType type) { |
| helper_.CheckOnValidThread(); |
| if (type == NavigatingFrameType::kMainFrame) { |
| main_thread_only().navigation_task_expected_count++; |
| UpdatePolicy(); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::RemovePendingNavigation( |
| NavigatingFrameType type) { |
| helper_.CheckOnValidThread(); |
| DCHECK_GT(main_thread_only().navigation_task_expected_count, 0); |
| if (type == NavigatingFrameType::kMainFrame && |
| main_thread_only().navigation_task_expected_count > 0) { |
| main_thread_only().navigation_task_expected_count--; |
| UpdatePolicy(); |
| } |
| } |
| |
| std::unique_ptr<base::SingleSampleMetric> |
| MainThreadSchedulerImpl::CreateMaxQueueingTimeMetric() { |
| return base::SingleSampleMetricsFactory::Get()->CreateCustomCountsMetric( |
| "RendererScheduler.MaxQueueingTime", 1, 10000, 50); |
| } |
| |
| void MainThreadSchedulerImpl::DidStartProvisionalLoad(bool is_main_frame) { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::DidStartProvisionalLoad"); |
| if (is_main_frame) { |
| base::AutoLock lock(any_thread_lock_); |
| ResetForNavigationLocked(); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::DidCommitProvisionalLoad( |
| bool is_web_history_inert_commit, |
| bool is_reload, |
| bool is_main_frame) { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::DidCommitProvisionalLoad"); |
| // Initialize |max_queueing_time_metric| lazily so that |
| // |SingleSampleMetricsFactory::SetFactory()| is called before |
| // |SingleSampleMetricsFactory::Get()| |
| if (!main_thread_only().max_queueing_time_metric) { |
| main_thread_only().max_queueing_time_metric = CreateMaxQueueingTimeMetric(); |
| } |
| main_thread_only().max_queueing_time_metric.reset(); |
| main_thread_only().max_queueing_time = base::TimeDelta(); |
| main_thread_only().has_navigated = true; |
| |
| // If this either isn't a history inert commit or it's a reload then we must |
| // reset the task cost estimators. |
| if (is_main_frame && (!is_web_history_inert_commit || is_reload)) { |
| base::AutoLock lock(any_thread_lock_); |
| ResetForNavigationLocked(); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::OnFirstMeaningfulPaint() { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::OnFirstMeaningfulPaint"); |
| base::AutoLock lock(any_thread_lock_); |
| any_thread().waiting_for_meaningful_paint = false; |
| UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged); |
| } |
| |
| void MainThreadSchedulerImpl::ResetForNavigationLocked() { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "MainThreadSchedulerImpl::ResetForNavigationLocked"); |
| helper_.CheckOnValidThread(); |
| any_thread_lock_.AssertAcquired(); |
| any_thread().user_model.Reset(helper_.NowTicks()); |
| any_thread().have_seen_a_potentially_blocking_gesture = false; |
| any_thread().waiting_for_meaningful_paint = true; |
| any_thread().have_seen_input_since_navigation = false; |
| main_thread_only().loading_task_cost_estimator.Clear(); |
| main_thread_only().timer_task_cost_estimator.Clear(); |
| main_thread_only().idle_time_estimator.Clear(); |
| main_thread_only().have_seen_a_begin_main_frame = false; |
| main_thread_only().have_reported_blocking_intervention_since_navigation = |
| false; |
| for (PageSchedulerImpl* page_scheduler : main_thread_only().page_schedulers) { |
| page_scheduler->OnNavigation(); |
| } |
| UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged); |
| |
| UMA_HISTOGRAM_COUNTS_100("RendererScheduler.WebViewsPerScheduler", |
| main_thread_only().page_schedulers.size()); |
| |
| size_t frame_count = 0; |
| for (PageSchedulerImpl* page_scheduler : main_thread_only().page_schedulers) { |
| frame_count += page_scheduler->FrameCount(); |
| } |
| UMA_HISTOGRAM_COUNTS_100("RendererScheduler.WebFramesPerScheduler", |
| frame_count); |
| } |
| |
| void MainThreadSchedulerImpl::SetTopLevelBlameContext( |
| base::trace_event::BlameContext* blame_context) { |
| // Any task that runs in the default task runners belongs to the context of |
| // all frames (as opposed to a particular frame). Note that the task itself |
| // may still enter a more specific blame context if necessary. |
| // |
| // Per-frame task runners (loading, timers, etc.) are configured with a more |
| // specific blame context by FrameSchedulerImpl. |
| // |
| // TODO(altimin): automatically enter top-level for all task queues associated |
| // with renderer scheduler which do not have a corresponding frame. |
| control_task_queue_->SetBlameContext(blame_context); |
| DefaultTaskQueue()->SetBlameContext(blame_context); |
| compositor_task_queue_->SetBlameContext(blame_context); |
| idle_helper_.IdleTaskRunner()->SetBlameContext(blame_context); |
| v8_task_queue_->SetBlameContext(blame_context); |
| ipc_task_queue_->SetBlameContext(blame_context); |
| } |
| |
| void MainThreadSchedulerImpl::SetRAILModeObserver(RAILModeObserver* observer) { |
| main_thread_only().rail_mode_observer = observer; |
| } |
| |
| void MainThreadSchedulerImpl::SetRendererProcessType(RendererProcessType type) { |
| main_thread_only().process_type = type; |
| } |
| |
| WebScopedVirtualTimePauser |
| MainThreadSchedulerImpl::CreateWebScopedVirtualTimePauser( |
| const char* name, |
| WebScopedVirtualTimePauser::VirtualTaskDuration duration) { |
| return WebScopedVirtualTimePauser(this, duration, |
| WebString(WTF::String(name))); |
| } |
| |
| void MainThreadSchedulerImpl::RegisterTimeDomain(TimeDomain* time_domain) { |
| helper_.RegisterTimeDomain(time_domain); |
| } |
| |
| void MainThreadSchedulerImpl::UnregisterTimeDomain(TimeDomain* time_domain) { |
| helper_.UnregisterTimeDomain(time_domain); |
| } |
| |
| const base::TickClock* MainThreadSchedulerImpl::tick_clock() const { |
| return helper_.GetClock(); |
| } |
| |
| void MainThreadSchedulerImpl::AddPageScheduler( |
| PageSchedulerImpl* page_scheduler) { |
| main_thread_only().page_schedulers.insert(page_scheduler); |
| } |
| |
| void MainThreadSchedulerImpl::RemovePageScheduler( |
| PageSchedulerImpl* page_scheduler) { |
| DCHECK(main_thread_only().page_schedulers.find(page_scheduler) != |
| main_thread_only().page_schedulers.end()); |
| main_thread_only().page_schedulers.erase(page_scheduler); |
| } |
| |
| void MainThreadSchedulerImpl::BroadcastIntervention( |
| const std::string& message) { |
| helper_.CheckOnValidThread(); |
| for (auto* page_scheduler : main_thread_only().page_schedulers) |
| page_scheduler->ReportIntervention(message); |
| } |
| |
| void MainThreadSchedulerImpl::OnTaskStarted(MainThreadTaskQueue* queue, |
| const TaskQueue::Task& task, |
| base::TimeTicks start) { |
| main_thread_only().current_task_start_time = start; |
| queueing_time_estimator_.OnTopLevelTaskStarted(start, queue); |
| main_thread_only().task_description_for_tracing = TaskDescriptionForTracing{ |
| static_cast<TaskType>(task.task_type()), |
| queue |
| ? base::Optional<MainThreadTaskQueue::QueueType>(queue->queue_type()) |
| : base::nullopt}; |
| } |
| |
| void MainThreadSchedulerImpl::OnTaskCompleted( |
| MainThreadTaskQueue* queue, |
| const TaskQueue::Task& task, |
| base::TimeTicks start, |
| base::TimeTicks end, |
| base::Optional<base::TimeDelta> thread_time) { |
| DCHECK_LE(start, end); |
| queueing_time_estimator_.OnTopLevelTaskCompleted(end); |
| |
| if (queue) |
| task_queue_throttler()->OnTaskRunTimeReported(queue, start, end); |
| |
| // TODO(altimin): Per-page metrics should also be considered. |
| main_thread_only().metrics_helper.RecordTaskMetrics(queue, task, start, end, |
| thread_time); |
| main_thread_only().task_description_for_tracing = base::nullopt; |
| |
| RecordTaskUkm(queue, task, start, end, thread_time); |
| } |
| |
| void MainThreadSchedulerImpl::RecordTaskUkm( |
| MainThreadTaskQueue* queue, |
| const TaskQueue::Task& task, |
| base::TimeTicks start, |
| base::TimeTicks end, |
| base::Optional<base::TimeDelta> thread_time) { |
| if (!ShouldRecordTaskUkm()) |
| return; |
| |
| if (queue && queue->GetFrameScheduler()) { |
| RecordTaskUkmImpl(queue, task, start, end, thread_time, |
| static_cast<PageSchedulerImpl*>( |
| queue->GetFrameScheduler()->GetPageScheduler()), |
| 1); |
| return; |
| } |
| |
| for (PageSchedulerImpl* page_scheduler : main_thread_only().page_schedulers) { |
| RecordTaskUkmImpl(queue, task, start, end, thread_time, page_scheduler, |
| main_thread_only().page_schedulers.size()); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::RecordTaskUkmImpl( |
| MainThreadTaskQueue* queue, |
| const TaskQueue::Task& task, |
| base::TimeTicks start, |
| base::TimeTicks end, |
| base::Optional<base::TimeDelta> thread_time, |
| PageSchedulerImpl* page_scheduler, |
| size_t page_schedulers_to_attribute) { |
| // Skip tasks which have deleted the page scheduler. |
| if (!page_scheduler) |
| return; |
| |
| ukm::UkmRecorder* ukm_recorder = page_scheduler->GetUkmRecorder(); |
| // OOPIFs are not supported. |
| if (!ukm_recorder) |
| return; |
| |
| ukm::builders::RendererSchedulerTask builder( |
| page_scheduler->GetUkmSourceId()); |
| |
| builder.SetPageSchedulers(page_schedulers_to_attribute); |
| builder.SetRendererBackgrounded(main_thread_only().renderer_backgrounded); |
| builder.SetRendererHidden(main_thread_only().renderer_hidden); |
| builder.SetRendererAudible(main_thread_only().is_audio_playing); |
| builder.SetUseCase( |
| static_cast<int>(main_thread_only().current_use_case.get())); |
| builder.SetTaskType(task.task_type()); |
| builder.SetQueueType(static_cast<int>( |
| queue ? queue->queue_type() : MainThreadTaskQueue::QueueType::kDetached)); |
| builder.SetFrameStatus(static_cast<int>( |
| GetFrameStatus(queue ? queue->GetFrameScheduler() : nullptr))); |
| builder.SetTaskDuration((end - start).InMicroseconds()); |
| |
| if (thread_time) { |
| builder.SetTaskDuration(thread_time->InMicroseconds()); |
| } |
| |
| builder.Record(ukm_recorder); |
| } |
| |
| void MainThreadSchedulerImpl::OnBeginNestedRunLoop() { |
| queueing_time_estimator_.OnBeginNestedRunLoop(); |
| |
| main_thread_only().nested_runloop = true; |
| ApplyVirtualTimePolicy(); |
| } |
| |
| void MainThreadSchedulerImpl::OnExitNestedRunLoop() { |
| main_thread_only().nested_runloop = false; |
| ApplyVirtualTimePolicy(); |
| } |
| |
| void MainThreadSchedulerImpl::AddTaskTimeObserver( |
| TaskTimeObserver* task_time_observer) { |
| helper_.AddTaskTimeObserver(task_time_observer); |
| } |
| |
| void MainThreadSchedulerImpl::RemoveTaskTimeObserver( |
| TaskTimeObserver* task_time_observer) { |
| helper_.RemoveTaskTimeObserver(task_time_observer); |
| } |
| |
| bool MainThreadSchedulerImpl::ContainsLocalMainFrame() { |
| for (auto* page_scheduler : main_thread_only().page_schedulers) { |
| if (page_scheduler->IsMainFrameLocal()) |
| return true; |
| } |
| return false; |
| } |
| |
| void MainThreadSchedulerImpl::OnQueueingTimeForWindowEstimated( |
| base::TimeDelta queueing_time, |
| bool is_disjoint_window) { |
| if (main_thread_only().has_navigated) { |
| if (main_thread_only().max_queueing_time < queueing_time) { |
| if (!main_thread_only().max_queueing_time_metric) { |
| main_thread_only().max_queueing_time_metric = |
| CreateMaxQueueingTimeMetric(); |
| } |
| main_thread_only().max_queueing_time_metric->SetSample( |
| queueing_time.InMilliseconds()); |
| main_thread_only().max_queueing_time = queueing_time; |
| } |
| } |
| |
| if (!is_disjoint_window || !ContainsLocalMainFrame()) |
| return; |
| |
| UMA_HISTOGRAM_TIMES("RendererScheduler.ExpectedTaskQueueingDuration", |
| queueing_time); |
| UMA_HISTOGRAM_CUSTOM_COUNTS( |
| "RendererScheduler.ExpectedTaskQueueingDuration3", |
| queueing_time.InMicroseconds(), kMinExpectedQueueingTimeBucket, |
| kMaxExpectedQueueingTimeBucket, kNumberExpectedQueueingTimeBuckets); |
| TRACE_COUNTER1(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), |
| "estimated_queueing_time_for_window", |
| queueing_time.InMillisecondsF()); |
| |
| if (::resource_coordinator::IsResourceCoordinatorEnabled()) { |
| RendererResourceCoordinator::Get().SetExpectedTaskQueueingDuration( |
| queueing_time); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::OnReportFineGrainedExpectedQueueingTime( |
| const char* split_description, |
| base::TimeDelta queueing_time) { |
| if (!ContainsLocalMainFrame()) |
| return; |
| |
| base::UmaHistogramCustomCounts( |
| split_description, queueing_time.InMicroseconds(), |
| kMinExpectedQueueingTimeBucket, kMaxExpectedQueueingTimeBucket, |
| kNumberExpectedQueueingTimeBuckets); |
| } |
| |
| AutoAdvancingVirtualTimeDomain* |
| MainThreadSchedulerImpl::GetVirtualTimeDomain() { |
| return virtual_time_domain_.get(); |
| } |
| |
| void MainThreadSchedulerImpl::AddQueueToWakeUpBudgetPool( |
| MainThreadTaskQueue* queue) { |
| if (!main_thread_only().wake_up_budget_pool) { |
| main_thread_only().wake_up_budget_pool = |
| task_queue_throttler()->CreateWakeUpBudgetPool("renderer_wake_up_pool"); |
| main_thread_only().wake_up_budget_pool->SetWakeUpRate(1); |
| main_thread_only().wake_up_budget_pool->SetWakeUpDuration( |
| GetWakeUpDuration()); |
| } |
| main_thread_only().wake_up_budget_pool->AddQueue(tick_clock()->NowTicks(), |
| queue); |
| } |
| |
| TimeDomain* MainThreadSchedulerImpl::GetActiveTimeDomain() { |
| if (main_thread_only().use_virtual_time) { |
| return GetVirtualTimeDomain(); |
| } else { |
| return real_time_domain(); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::OnTraceLogEnabled() { |
| CreateTraceEventObjectSnapshot(); |
| tracing_controller_.OnTraceLogEnabled(); |
| for (PageSchedulerImpl* page_scheduler : main_thread_only().page_schedulers) { |
| page_scheduler->OnTraceLogEnabled(); |
| } |
| } |
| |
| void MainThreadSchedulerImpl::OnTraceLogDisabled() {} |
| |
| base::WeakPtr<MainThreadSchedulerImpl> MainThreadSchedulerImpl::GetWeakPtr() { |
| return weak_factory_.GetWeakPtr(); |
| } |
| |
| bool MainThreadSchedulerImpl::IsAudioPlaying() const { |
| return main_thread_only().is_audio_playing; |
| } |
| |
| bool MainThreadSchedulerImpl::ShouldRecordTaskUkm() { |
| // This function returns true with probability of kSamplingRateForTaskUkm. |
| return main_thread_only().uniform_distribution( |
| main_thread_only().random_generator) < kSamplingRateForTaskUkm; |
| } |
| |
| // static |
| const char* MainThreadSchedulerImpl::UseCaseToString(UseCase use_case) { |
| switch (use_case) { |
| case UseCase::kNone: |
| return "none"; |
| case UseCase::kCompositorGesture: |
| return "compositor_gesture"; |
| case UseCase::kMainThreadCustomInputHandling: |
| return "main_thread_custom_input_handling"; |
| case UseCase::kSynchronizedGesture: |
| return "synchronized_gesture"; |
| case UseCase::kTouchstart: |
| return "touchstart"; |
| case UseCase::kLoading: |
| return "loading"; |
| case UseCase::kMainThreadGesture: |
| return "main_thread_gesture"; |
| default: |
| NOTREACHED(); |
| return nullptr; |
| } |
| } |
| |
| // static |
| const char* MainThreadSchedulerImpl::RAILModeToString(v8::RAILMode rail_mode) { |
| switch (rail_mode) { |
| case v8::PERFORMANCE_RESPONSE: |
| return "response"; |
| case v8::PERFORMANCE_ANIMATION: |
| return "animation"; |
| case v8::PERFORMANCE_IDLE: |
| return "idle"; |
| case v8::PERFORMANCE_LOAD: |
| return "load"; |
| default: |
| NOTREACHED(); |
| return nullptr; |
| } |
| } |
| |
| // static |
| const char* MainThreadSchedulerImpl::TimeDomainTypeToString( |
| TimeDomainType domain_type) { |
| switch (domain_type) { |
| case TimeDomainType::kReal: |
| return "real"; |
| case TimeDomainType::kThrottled: |
| return "throttled"; |
| case TimeDomainType::kVirtual: |
| return "virtual"; |
| default: |
| NOTREACHED(); |
| return nullptr; |
| } |
| } |
| |
| // static |
| const char* MainThreadSchedulerImpl::VirtualTimePolicyToString( |
| VirtualTimePolicy virtual_time_policy) { |
| switch (virtual_time_policy) { |
| case VirtualTimePolicy::kAdvance: |
| return "ADVANCE"; |
| case VirtualTimePolicy::kPause: |
| return "PAUSE"; |
| case VirtualTimePolicy::kDeterministicLoading: |
| return "DETERMINISTIC_LOADING"; |
| default: |
| NOTREACHED(); |
| return nullptr; |
| } |
| } |
| |
| } // namespace scheduler |
| } // namespace blink |
