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Unified Diff: content/renderer/scheduler/renderer_scheduler_selector.h

Issue 664963002: content: Add RendererScheduler. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Fix bug in calculating remaining_compositor_priority_time Created 6 years, 2 months ago
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Index: content/renderer/scheduler/renderer_scheduler_selector.h
diff --git a/content/renderer/scheduler/renderer_scheduler_selector.h b/content/renderer/scheduler/renderer_scheduler_selector.h
new file mode 100644
index 0000000000000000000000000000000000000000..a79b15a7cc13228b2b8c98fbd5c5af5d973deb61
--- /dev/null
+++ b/content/renderer/scheduler/renderer_scheduler_selector.h
@@ -0,0 +1,69 @@
+// 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.
+
+#ifndef CONTENT_RENDERER_SCHEDULER_RENDERER_SCHEDULER_POLICY_H_
+#define CONTENT_RENDERER_SCHEDULER_RENDERER_SCHEDULER_POLICY_H_
+
+#include "base/threading/thread_checker.h"
+#include "content/renderer/scheduler/task_queue_selector.h"
+
+namespace content {
+
+class RendererSchedulerSelector : public TaskQueueSelector {
+ public:
+ enum QueuePriority {
+ kControlPriority,
+ kHighPriority,
+ kNormalPriority,
+ kBestEffortPriority,
+ // Must be the last entry.
+ kQueuePriorityCount,
+ kFirstQueuePriority = kControlPriority,
+ };
+
+ RendererSchedulerSelector();
+ virtual ~RendererSchedulerSelector();
+
+ // Set the priority of |queue_index| to |set_priority|.
+ void SetQueuePriority(size_t queue_index, QueuePriority priority);
+
+ // Enable the |queue_index| with a priority of |priority|. By default all
+ // queues are enabled with normal priority.
+ void EnableQueue(size_t queue_index, QueuePriority priority);
+
+ // Disable the |queue_index|.
+ void DisableQueue(size_t queue_index);
+
+ // TaskQueueSelector implementation:
+ virtual void RegisterWorkQueues(
+ const std::vector<const base::TaskQueue*>& work_queues) override;
+ virtual bool SelectWorkQueueToService(size_t* out_queue_index) override;
+
+ private:
+ // Return true if |out_queue_index| indicates the index of the queue with
+ // the oldest pending task from the set of queues of |priority|, or
+ // false if all queues of that priority are empty.
+ bool ChooseOldestWithPriority(QueuePriority priority,
+ size_t* out_queue_index) const;
+
+ // Returns true if |queue_index| is enabled with the given |priority|.
+ bool QueueEnabledWithPriority(
+ size_t queue_index, QueuePriority priority) const;
+
+ size_t PrioritiesMaskFromQueueIndex(size_t queue_index) const;
+
+ // Number of high priority tasks which can be run before a normal priority
+ // task should be selected to prevent starvation.
+ // TODO(rmcilroy): Check if this is a good value.
+ static const int kMaxStarvationTasks = 5;
+
+ base::ThreadChecker main_thread_checker_;
+ std::vector<const base::TaskQueue*> work_queues_;
+ size_t queue_priorities_[kQueuePriorityCount];
+ int normal_queue_starvation_count_;
+};
+
+} // namespace content
+
+#endif // CONTENT_RENDERER_SCHEDULER_RENDERER_SCHEDULER_POLICY_H_

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