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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef COMPONENTS_SCHEDULER_RENDERER_TASK_COST_ESTIMATOR_H_ | 5 #ifndef COMPONENTS_SCHEDULER_RENDERER_TASK_COST_ESTIMATOR_H_ |
6 #define COMPONENTS_SCHEDULER_RENDERER_TASK_COST_ESTIMATOR_H_ | 6 #define COMPONENTS_SCHEDULER_RENDERER_TASK_COST_ESTIMATOR_H_ |
7 | 7 |
8 #include "base/message_loop/message_loop.h" | 8 #include "base/message_loop/message_loop.h" |
9 #include "base/time/time.h" | 9 #include "base/time/time.h" |
10 #include "cc/base/rolling_time_delta_history.h" | 10 #include "cc/base/rolling_time_delta_history.h" |
11 #include "components/scheduler/scheduler_export.h" | 11 #include "components/scheduler/scheduler_export.h" |
12 | 12 |
13 namespace base { | 13 namespace base { |
14 class TickClock; | 14 class TickClock; |
15 } | 15 } |
16 | 16 |
17 namespace scheduler { | 17 namespace scheduler { |
18 | 18 |
19 // Estimates the cost of running tasks based on historical timing data. | 19 // Estimates the cost of running tasks based on historical timing data. |
20 class SCHEDULER_EXPORT TaskCostEstimator | 20 class SCHEDULER_EXPORT TaskCostEstimator |
21 : public base::MessageLoop::TaskObserver { | 21 : public base::MessageLoop::TaskObserver { |
22 public: | 22 public: |
23 TaskCostEstimator(int sample_count, double estimation_percentile); | 23 TaskCostEstimator(base::TickClock* time_source, |
| 24 int sample_count, |
| 25 double estimation_percentile); |
24 ~TaskCostEstimator() override; | 26 ~TaskCostEstimator() override; |
25 | 27 |
26 base::TimeDelta expected_task_duration() const; | 28 base::TimeDelta expected_task_duration() const; |
27 | 29 |
28 // TaskObserver implementation: | 30 // TaskObserver implementation: |
29 void WillProcessTask(const base::PendingTask& pending_task) override; | 31 void WillProcessTask(const base::PendingTask& pending_task) override; |
30 void DidProcessTask(const base::PendingTask& pending_task) override; | 32 void DidProcessTask(const base::PendingTask& pending_task) override; |
31 | 33 |
32 void Clear(); | 34 void Clear(); |
33 | 35 |
34 void SetTimeSourceForTesting(scoped_ptr<base::TickClock> time_source); | |
35 | |
36 private: | 36 private: |
37 cc::RollingTimeDeltaHistory rolling_time_delta_history_; | 37 cc::RollingTimeDeltaHistory rolling_time_delta_history_; |
38 scoped_ptr<base::TickClock> time_source_; | 38 base::TickClock* time_source_; // NOT OWNED |
39 int outstanding_task_count_; | 39 int outstanding_task_count_; |
40 double estimation_percentile_; | 40 double estimation_percentile_; |
41 base::TimeTicks task_start_time_; | 41 base::TimeTicks task_start_time_; |
42 base::TimeDelta expected_task_duration_; | 42 base::TimeDelta expected_task_duration_; |
43 | 43 |
44 DISALLOW_COPY_AND_ASSIGN(TaskCostEstimator); | 44 DISALLOW_COPY_AND_ASSIGN(TaskCostEstimator); |
45 }; | 45 }; |
46 | 46 |
47 } // namespace scheduler | 47 } // namespace scheduler |
48 | 48 |
49 #endif // COMPONENTS_SCHEDULER_RENDERER_TASK_COST_ESTIMATOR_H_ | 49 #endif // COMPONENTS_SCHEDULER_RENDERER_TASK_COST_ESTIMATOR_H_ |
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