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