replicant-frameworks_native/services/surfaceflinger/FrameTracker.cpp

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/*
* Copyright (C) 2012 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.
*/
// This is needed for stdint.h to define INT64_MAX in C++
#define __STDC_LIMIT_MACROS
#include <inttypes.h>
#include <cutils/log.h>
#include <ui/Fence.h>
#include <ui/FrameStats.h>
#include <utils/String8.h>
#include "FrameTracker.h"
#include "EventLog/EventLog.h"
namespace android {
FrameTracker::FrameTracker() :
mOffset(0),
mNumFences(0),
mDisplayPeriod(0) {
resetFrameCountersLocked();
}
void FrameTracker::setDesiredPresentTime(nsecs_t presentTime) {
Mutex::Autolock lock(mMutex);
mFrameRecords[mOffset].desiredPresentTime = presentTime;
}
void FrameTracker::setFrameReadyTime(nsecs_t readyTime) {
Mutex::Autolock lock(mMutex);
mFrameRecords[mOffset].frameReadyTime = readyTime;
}
void FrameTracker::setFrameReadyFence(const sp<Fence>& readyFence) {
Mutex::Autolock lock(mMutex);
mFrameRecords[mOffset].frameReadyFence = readyFence;
mNumFences++;
}
void FrameTracker::setActualPresentTime(nsecs_t presentTime) {
Mutex::Autolock lock(mMutex);
mFrameRecords[mOffset].actualPresentTime = presentTime;
}
void FrameTracker::setActualPresentFence(const sp<Fence>& readyFence) {
Mutex::Autolock lock(mMutex);
mFrameRecords[mOffset].actualPresentFence = readyFence;
mNumFences++;
}
void FrameTracker::setDisplayRefreshPeriod(nsecs_t displayPeriod) {
Mutex::Autolock lock(mMutex);
mDisplayPeriod = displayPeriod;
}
void FrameTracker::advanceFrame() {
Mutex::Autolock lock(mMutex);
// Update the statistic to include the frame we just finished.
updateStatsLocked(mOffset);
// Advance to the next frame.
mOffset = (mOffset+1) % NUM_FRAME_RECORDS;
mFrameRecords[mOffset].desiredPresentTime = INT64_MAX;
mFrameRecords[mOffset].frameReadyTime = INT64_MAX;
mFrameRecords[mOffset].actualPresentTime = INT64_MAX;
if (mFrameRecords[mOffset].frameReadyFence != NULL) {
// We're clobbering an unsignaled fence, so we need to decrement the
// fence count.
mFrameRecords[mOffset].frameReadyFence = NULL;
mNumFences--;
}
if (mFrameRecords[mOffset].actualPresentFence != NULL) {
// We're clobbering an unsignaled fence, so we need to decrement the
// fence count.
mFrameRecords[mOffset].actualPresentFence = NULL;
mNumFences--;
}
// Clean up the signaled fences to keep the number of open fence FDs in
// this process reasonable.
processFencesLocked();
}
void FrameTracker::clearStats() {
Mutex::Autolock lock(mMutex);
for (size_t i = 0; i < NUM_FRAME_RECORDS; i++) {
mFrameRecords[i].desiredPresentTime = 0;
mFrameRecords[i].frameReadyTime = 0;
mFrameRecords[i].actualPresentTime = 0;
mFrameRecords[i].frameReadyFence.clear();
mFrameRecords[i].actualPresentFence.clear();
}
mNumFences = 0;
mFrameRecords[mOffset].desiredPresentTime = INT64_MAX;
mFrameRecords[mOffset].frameReadyTime = INT64_MAX;
mFrameRecords[mOffset].actualPresentTime = INT64_MAX;
}
void FrameTracker::getStats(FrameStats* outStats) const {
Mutex::Autolock lock(mMutex);
processFencesLocked();
outStats->refreshPeriodNano = mDisplayPeriod;
const size_t offset = mOffset;
for (size_t i = 1; i < NUM_FRAME_RECORDS; i++) {
const size_t index = (offset + i) % NUM_FRAME_RECORDS;
// Skip frame records with no data (if buffer not yet full).
if (mFrameRecords[index].desiredPresentTime == 0) {
continue;
}
nsecs_t desiredPresentTimeNano = mFrameRecords[index].desiredPresentTime;
outStats->desiredPresentTimesNano.push_back(desiredPresentTimeNano);
nsecs_t actualPresentTimeNano = mFrameRecords[index].actualPresentTime;
outStats->actualPresentTimesNano.push_back(actualPresentTimeNano);
nsecs_t frameReadyTimeNano = mFrameRecords[index].frameReadyTime;
outStats->frameReadyTimesNano.push_back(frameReadyTimeNano);
}
}
void FrameTracker::logAndResetStats(const String8& name) {
Mutex::Autolock lock(mMutex);
logStatsLocked(name);
resetFrameCountersLocked();
}
void FrameTracker::processFencesLocked() const {
FrameRecord* records = const_cast<FrameRecord*>(mFrameRecords);
int& numFences = const_cast<int&>(mNumFences);
for (int i = 1; i < NUM_FRAME_RECORDS && numFences > 0; i++) {
size_t idx = (mOffset+NUM_FRAME_RECORDS-i) % NUM_FRAME_RECORDS;
bool updated = false;
const sp<Fence>& rfence = records[idx].frameReadyFence;
if (rfence != NULL) {
records[idx].frameReadyTime = rfence->getSignalTime();
if (records[idx].frameReadyTime < INT64_MAX) {
records[idx].frameReadyFence = NULL;
numFences--;
updated = true;
}
}
const sp<Fence>& pfence = records[idx].actualPresentFence;
if (pfence != NULL) {
records[idx].actualPresentTime = pfence->getSignalTime();
if (records[idx].actualPresentTime < INT64_MAX) {
records[idx].actualPresentFence = NULL;
numFences--;
updated = true;
}
}
if (updated) {
updateStatsLocked(idx);
}
}
}
void FrameTracker::updateStatsLocked(size_t newFrameIdx) const {
int* numFrames = const_cast<int*>(mNumFrames);
if (mDisplayPeriod > 0 && isFrameValidLocked(newFrameIdx)) {
size_t prevFrameIdx = (newFrameIdx+NUM_FRAME_RECORDS-1) %
NUM_FRAME_RECORDS;
if (isFrameValidLocked(prevFrameIdx)) {
nsecs_t newPresentTime =
mFrameRecords[newFrameIdx].actualPresentTime;
nsecs_t prevPresentTime =
mFrameRecords[prevFrameIdx].actualPresentTime;
nsecs_t duration = newPresentTime - prevPresentTime;
int numPeriods = int((duration + mDisplayPeriod/2) /
mDisplayPeriod);
for (int i = 0; i < NUM_FRAME_BUCKETS-1; i++) {
int nextBucket = 1 << (i+1);
if (numPeriods < nextBucket) {
numFrames[i]++;
return;
}
}
// The last duration bucket is a catch-all.
numFrames[NUM_FRAME_BUCKETS-1]++;
}
}
}
void FrameTracker::resetFrameCountersLocked() {
for (int i = 0; i < NUM_FRAME_BUCKETS; i++) {
mNumFrames[i] = 0;
}
}
void FrameTracker::logStatsLocked(const String8& name) const {
for (int i = 0; i < NUM_FRAME_BUCKETS; i++) {
if (mNumFrames[i] > 0) {
EventLog::logFrameDurations(name, mNumFrames, NUM_FRAME_BUCKETS);
return;
}
}
}
bool FrameTracker::isFrameValidLocked(size_t idx) const {
return mFrameRecords[idx].actualPresentTime > 0 &&
mFrameRecords[idx].actualPresentTime < INT64_MAX;
}
void FrameTracker::dumpStats(String8& result) const {
Mutex::Autolock lock(mMutex);
processFencesLocked();
const size_t o = mOffset;
for (size_t i = 1; i < NUM_FRAME_RECORDS; i++) {
const size_t index = (o+i) % NUM_FRAME_RECORDS;
result.appendFormat("%" PRId64 "\t%" PRId64 "\t%" PRId64 "\n",
mFrameRecords[index].desiredPresentTime,
mFrameRecords[index].actualPresentTime,
mFrameRecords[index].frameReadyTime);
}
result.append("\n");
}
} // namespace android