104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
/*
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* Copyright 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_GUI_OCCUPANCYTRACKER_H
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#define ANDROID_GUI_OCCUPANCYTRACKER_H
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#include <binder/Parcelable.h>
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#include <utils/Timers.h>
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#include <deque>
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#include <unordered_map>
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namespace android {
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class String8;
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class OccupancyTracker
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{
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public:
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OccupancyTracker()
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: mPendingSegment(),
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mSegmentHistory(),
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mLastOccupancy(0),
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mLastOccupancyChangeTime(0) {}
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struct Segment : public Parcelable {
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Segment()
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: totalTime(0),
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numFrames(0),
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occupancyAverage(0.0f),
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usedThirdBuffer(false) {}
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Segment(nsecs_t totalTime, size_t numFrames, float occupancyAverage,
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bool usedThirdBuffer)
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: totalTime(totalTime),
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numFrames(numFrames),
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occupancyAverage(occupancyAverage),
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usedThirdBuffer(usedThirdBuffer) {}
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// Parcelable interface
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virtual status_t writeToParcel(Parcel* parcel) const override;
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virtual status_t readFromParcel(const Parcel* parcel) override;
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nsecs_t totalTime;
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size_t numFrames;
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// Average occupancy of the queue over this segment. (0.0, 1.0) implies
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// double-buffered, (1.0, 2.0) implies triple-buffered.
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float occupancyAverage;
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// Whether a third buffer was used at all during this segment (since a
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// segment could read as double-buffered on average, but still require a
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// third buffer to avoid jank for some smaller portion)
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bool usedThirdBuffer;
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};
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void registerOccupancyChange(size_t occupancy);
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std::vector<Segment> getSegmentHistory(bool forceFlush);
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private:
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static constexpr size_t MAX_HISTORY_SIZE = 10;
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static constexpr nsecs_t NEW_SEGMENT_DELAY = ms2ns(100);
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static constexpr size_t LONG_SEGMENT_THRESHOLD = 3;
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struct PendingSegment {
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void clear() {
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totalTime = 0;
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numFrames = 0;
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mOccupancyTimes.clear();
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}
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nsecs_t totalTime;
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size_t numFrames;
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std::unordered_map<size_t, nsecs_t> mOccupancyTimes;
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};
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void recordPendingSegment();
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PendingSegment mPendingSegment;
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std::deque<Segment> mSegmentHistory;
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size_t mLastOccupancy;
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nsecs_t mLastOccupancyChangeTime;
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}; // class OccupancyTracker
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} // namespace android
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#endif
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