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