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118 lines
3.7 KiB
118 lines
3.7 KiB
/*
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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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#undef LOG_TAG
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#define LOG_TAG "OccupancyTracker"
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#include <gui/OccupancyTracker.h>
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#include <binder/Parcel.h>
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#include <utils/String8.h>
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#include <utils/Trace.h>
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#include <inttypes.h>
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namespace android {
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status_t OccupancyTracker::Segment::writeToParcel(Parcel* parcel) const {
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status_t result = parcel->writeInt64(totalTime);
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if (result != OK) {
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return result;
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}
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result = parcel->writeUint64(static_cast<uint64_t>(numFrames));
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if (result != OK) {
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return result;
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}
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result = parcel->writeFloat(occupancyAverage);
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if (result != OK) {
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return result;
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}
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return parcel->writeBool(usedThirdBuffer);
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}
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status_t OccupancyTracker::Segment::readFromParcel(const Parcel* parcel) {
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status_t result = parcel->readInt64(&totalTime);
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if (result != OK) {
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return result;
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}
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uint64_t uintNumFrames = 0;
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result = parcel->readUint64(&uintNumFrames);
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if (result != OK) {
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return result;
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}
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numFrames = static_cast<size_t>(uintNumFrames);
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result = parcel->readFloat(&occupancyAverage);
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if (result != OK) {
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return result;
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}
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return parcel->readBool(&usedThirdBuffer);
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}
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void OccupancyTracker::registerOccupancyChange(size_t occupancy) {
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ATRACE_CALL();
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nsecs_t now = systemTime();
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nsecs_t delta = now - mLastOccupancyChangeTime;
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if (delta > NEW_SEGMENT_DELAY) {
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recordPendingSegment();
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} else {
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mPendingSegment.totalTime += delta;
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if (mPendingSegment.mOccupancyTimes.count(mLastOccupancy)) {
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mPendingSegment.mOccupancyTimes[mLastOccupancy] += delta;
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} else {
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mPendingSegment.mOccupancyTimes[mLastOccupancy] = delta;
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}
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}
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if (occupancy > mLastOccupancy) {
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++mPendingSegment.numFrames;
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}
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mLastOccupancyChangeTime = now;
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mLastOccupancy = occupancy;
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}
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std::vector<OccupancyTracker::Segment> OccupancyTracker::getSegmentHistory(
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bool forceFlush) {
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if (forceFlush) {
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recordPendingSegment();
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}
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std::vector<Segment> segments(mSegmentHistory.cbegin(),
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mSegmentHistory.cend());
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mSegmentHistory.clear();
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return segments;
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}
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void OccupancyTracker::recordPendingSegment() {
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// Only record longer segments to get a better measurement of actual double-
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// vs. triple-buffered time
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if (mPendingSegment.numFrames > LONG_SEGMENT_THRESHOLD) {
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float occupancyAverage = 0.0f;
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bool usedThirdBuffer = false;
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for (const auto& timePair : mPendingSegment.mOccupancyTimes) {
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size_t occupancy = timePair.first;
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float timeRatio = static_cast<float>(timePair.second) /
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mPendingSegment.totalTime;
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occupancyAverage += timeRatio * occupancy;
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usedThirdBuffer = usedThirdBuffer || (occupancy > 1);
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}
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mSegmentHistory.push_front({mPendingSegment.totalTime,
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mPendingSegment.numFrames, occupancyAverage, usedThirdBuffer});
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if (mSegmentHistory.size() > MAX_HISTORY_SIZE) {
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mSegmentHistory.pop_back();
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}
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}
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mPendingSegment.clear();
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}
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} // namespace android
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