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Unified Diff: components/scheduler/renderer/queueing_time_estimator.h

Issue 1898233002: Report expected task queueing time via UMA (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 8 months ago
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Index: components/scheduler/renderer/queueing_time_estimator.h
diff --git a/components/scheduler/renderer/queueing_time_estimator.h b/components/scheduler/renderer/queueing_time_estimator.h
new file mode 100644
index 0000000000000000000000000000000000000000..79a2195bdfbf0ad08ba22f1dd018d28f41308f03
--- /dev/null
+++ b/components/scheduler/renderer/queueing_time_estimator.h
@@ -0,0 +1,55 @@
+// Copyright 2016 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 COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_ESTIMATOR_H_
+#define COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_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 "components/scheduler/scheduler_export.h"
+
+namespace base {
+class TickClock;
+}
+
+namespace scheduler {
+
+// Records the expected queueing time for a high priority task occurring
+// randomly during each interval of length |window_duration|.
+class SCHEDULER_EXPORT QueueingTimeEstimator
+ : public base::MessageLoop::TaskObserver {
+ public:
+ class QueueingTimeEstimatorClient {
Sami 2016/04/20 09:51:27 naming nit: This could just be called |Client| sin
tdresser 2016/04/20 15:13:33 Done.
+ public:
Sami 2016/04/20 09:51:27 Please add a virtual destructor.
tdresser 2016/04/20 15:13:32 Done.
+ virtual void OnQueueingTimeForWindowEstimated(
+ base::TimeDelta queueing_time) = 0;
+ };
+
+ QueueingTimeEstimator(QueueingTimeEstimatorClient* client,
+ base::TickClock* time_source,
+ base::TimeDelta window_duration);
+ ~QueueingTimeEstimator() override;
+
+ // TaskObserver implementation:
+ void WillProcessTask(const base::PendingTask& pending_task) override;
+ void DidProcessTask(const base::PendingTask& pending_task) override;
+
+ private:
+ QueueingTimeEstimatorClient* client_; // NOT OWNED.
+ base::TickClock* time_source_; // NOT OWNED.
+ int outstanding_task_count_;
+
+ base::TimeTicks task_start_time_;
+ base::TimeDelta current_expected_queueing_time_;
+ base::TimeDelta window_duration_;
+ base::TimeTicks window_start_time_;
+
+ DISALLOW_COPY_AND_ASSIGN(QueueingTimeEstimator);
+};
+
+} // namespace scheduler
+
+#endif // COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_ESTIMATOR_H_

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