| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_TASK_COST_ESTIMATOR_H_ |
| #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_TASK_COST_ESTIMATOR_H_ |
| |
| #include "base/macros.h" |
| #include "base/message_loop/message_loop.h" |
| #include "base/time/time.h" |
| #include "cc/base/rolling_time_delta_history.h" |
| #include "platform/PlatformExport.h" |
| |
| namespace base { |
| class TickClock; |
| } |
| |
| namespace blink { |
| namespace scheduler { |
| |
| // Estimates the cost of running tasks based on historical timing data. |
| class PLATFORM_EXPORT TaskCostEstimator |
| : public base::MessageLoop::TaskObserver { |
| public: |
| TaskCostEstimator(base::TickClock* time_source, |
| int sample_count, |
| double estimation_percentile); |
| ~TaskCostEstimator() override; |
| |
| base::TimeDelta expected_task_duration() const; |
| |
| // TaskObserver implementation: |
| void WillProcessTask(const base::PendingTask& pending_task) override; |
| void DidProcessTask(const base::PendingTask& pending_task) override; |
| |
| void Clear(); |
| |
| private: |
| cc::RollingTimeDeltaHistory rolling_time_delta_history_; |
| base::TickClock* time_source_; // NOT OWNED |
| int outstanding_task_count_; |
| double estimation_percentile_; |
| base::TimeTicks task_start_time_; |
| base::TimeDelta expected_task_duration_; |
| |
| DISALLOW_COPY_AND_ASSIGN(TaskCostEstimator); |
| }; |
| |
| } // namespace scheduler |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_TASK_COST_ESTIMATOR_H_ |