power-libperfmgr/aidl/PowerHintSession.cpp - LeafOS-Project/android_hardware_lineage_interfaces - Gitiles

 /*
  * Copyright 2021 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.
  */

 #define LOG_TAG "powerhal-libperfmgr"
 #define ATRACE_TAG (ATRACE_TAG_POWER | ATRACE_TAG_HAL)

 #include "PowerHintSession.h"

 #include <android-base/logging.h>
 #include <android-base/parsedouble.h>
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>
 #include <perfmgr/AdpfConfig.h>
 #include <private/android_filesystem_config.h>
 #include <sys/syscall.h>
 #include <time.h>
 #include <utils/Trace.h>

 #include <atomic>

 #include "PowerSessionManager.h"

 namespace aidl {
 namespace google {
 namespace hardware {
 namespace power {
 namespace impl {
 namespace pixel {

 using ::android::base::StringPrintf;
 using ::android::perfmgr::AdpfConfig;
 using ::android::perfmgr::HintManager;
 using std::chrono::duration_cast;
 using std::chrono::nanoseconds;

 namespace {

 static inline int64_t ns_to_100us(int64_t ns) {
     return ns / 100000;
 }

 }  // namespace

 int64_t PowerHintSession::convertWorkDurationToBoostByPid(
         const std::vector<WorkDuration> &actualDurations) {
     std::shared_ptr<AdpfConfig> adpfConfig = HintManager::GetInstance()->GetAdpfProfile();
     const nanoseconds &targetDuration = mDescriptor->duration;
     int64_t &integral_error = mDescriptor->integral_error;
     int64_t &previous_error = mDescriptor->previous_error;
     uint64_t samplingWindowP = adpfConfig->mSamplingWindowP;
     uint64_t samplingWindowI = adpfConfig->mSamplingWindowI;
     uint64_t samplingWindowD = adpfConfig->mSamplingWindowD;
     int64_t targetDurationNanos = (int64_t)targetDuration.count();
     int64_t length = actualDurations.size();
     int64_t p_start =
             samplingWindowP == 0 || samplingWindowP > length ? 0 : length - samplingWindowP;
     int64_t i_start =
             samplingWindowI == 0 || samplingWindowI > length ? 0 : length - samplingWindowI;
     int64_t d_start =
             samplingWindowD == 0 || samplingWindowD > length ? 0 : length - samplingWindowD;
     int64_t dt = ns_to_100us(targetDurationNanos);
     int64_t err_sum = 0;
     int64_t derivative_sum = 0;
     for (int64_t i = std::min({p_start, i_start, d_start}); i < length; i++) {
         int64_t actualDurationNanos = actualDurations[i].durationNanos;
         if (std::abs(actualDurationNanos) > targetDurationNanos * 20) {
             ALOGW("The actual duration is way far from the target (%" PRId64 " >> %" PRId64 ")",
                   actualDurationNanos, targetDurationNanos);
         }
         // PID control algorithm
         int64_t error = ns_to_100us(actualDurationNanos - targetDurationNanos);
         if (i >= d_start) {
             derivative_sum += error - previous_error;
         }
         if (i >= p_start) {
             err_sum += error;
         }
         if (i >= i_start) {
             integral_error += error * dt;
             integral_error = std::min(adpfConfig->getPidIHighDivI(), integral_error);
             integral_error = std::max(adpfConfig->getPidILowDivI(), integral_error);
         }
         previous_error = error;
     }
     int64_t pOut = static_cast<int64_t>((err_sum > 0 ? adpfConfig->mPidPo : adpfConfig->mPidPu) *
                                         err_sum / (length - p_start));
     int64_t iOut = static_cast<int64_t>(adpfConfig->mPidI * integral_error);
     int64_t dOut =
             static_cast<int64_t>((derivative_sum > 0 ? adpfConfig->mPidDo : adpfConfig->mPidDu) *
                                  derivative_sum / dt / (length - d_start));

     int64_t output = pOut + iOut + dOut;
     if (ATRACE_ENABLED()) {
         traceSessionVal("pid.err", err_sum / (length - p_start));
         traceSessionVal("pid.integral", integral_error);
         traceSessionVal("pid.derivative", derivative_sum / dt / (length - d_start));
         traceSessionVal("pid.pOut", pOut);
         traceSessionVal("pid.iOut", iOut);
         traceSessionVal("pid.dOut", dOut);
         traceSessionVal("pid.output", output);
     }
     return output;
 }

 PowerHintSession::PowerHintSession(int32_t tgid, int32_t uid, const std::vector<int32_t> &threadIds,
                                    int64_t durationNanos)
     : mStaleTimerHandler(sp<StaleTimerHandler>::make(this)),
       mBoostTimerHandler(sp<BoostTimerHandler>::make(this)) {
     mDescriptor = new AppHintDesc(tgid, uid, threadIds);
     mDescriptor->duration = std::chrono::nanoseconds(durationNanos);
     mIdString = StringPrintf("%" PRId32 "-%" PRId32 "-%" PRIxPTR, mDescriptor->tgid,
                              mDescriptor->uid, reinterpret_cast<uintptr_t>(this) & 0xffff);

     mPowerManagerHandler = PowerSessionManager::getInstance();
     mLastUpdatedTime.store(std::chrono::steady_clock::now());
     if (ATRACE_ENABLED()) {
         traceSessionVal("target", mDescriptor->duration.count());
         traceSessionVal("active", mDescriptor->is_active.load());
     }
     PowerSessionManager::getInstance()->addPowerSession(this);
     // init boost
     sendHint(SessionHint::CPU_LOAD_RESET);
     ALOGV("PowerHintSession created: %s", mDescriptor->toString().c_str());
 }

 PowerHintSession::~PowerHintSession() {
     close();
     ALOGV("PowerHintSession deleted: %s", mDescriptor->toString().c_str());
     if (ATRACE_ENABLED()) {
         traceSessionVal("target", 0);
         traceSessionVal("actl_last", 0);
         traceSessionVal("active", 0);
     }
     delete mDescriptor;
 }

 void PowerHintSession::traceSessionVal(char const *identifier, int64_t val) const {
     ATRACE_INT(StringPrintf("adpf.%s-%s", mIdString.c_str(), identifier).c_str(), val);
 }

 bool PowerHintSession::isAppSession() {
     // Check if uid is in range reserved for applications
     return mDescriptor->uid >= AID_APP_START;
 }

 void PowerHintSession::updateUniveralBoostMode() {
     if (!isAppSession()) {
         return;
     }
     if (ATRACE_ENABLED()) {
         const std::string tag = StringPrintf("%s:updateUniveralBoostMode()", mIdString.c_str());
         ATRACE_BEGIN(tag.c_str());
     }
     PowerHintMonitor::getInstance()->getLooper()->sendMessage(mPowerManagerHandler, NULL);
     if (ATRACE_ENABLED()) {
         ATRACE_END();
     }
 }

 void PowerHintSession::tryToSendPowerHint(std::string hint) {
     if (!mSupportedHints[hint].has_value()) {
         mSupportedHints[hint] = HintManager::GetInstance()->IsHintSupported(hint);
     }
     if (mSupportedHints[hint].value()) {
         HintManager::GetInstance()->DoHint(hint);
     }
 }

 int PowerHintSession::setSessionUclampMin(int32_t min, bool resetStale) {
     {
         std::lock_guard<std::mutex> guard(mSessionLock);
         mDescriptor->current_min = min;
     }
     if (min != 0 && resetStale) {
         mStaleTimerHandler->updateTimer();
     }
     PowerSessionManager::getInstance()->setUclampMin(this, min);

     if (ATRACE_ENABLED()) {
         traceSessionVal("min", min);
     }
     return 0;
 }

 int PowerHintSession::getUclampMin() {
     return mDescriptor->current_min;
 }

 void PowerHintSession::dumpToStream(std::ostream &stream) {
     stream << "ID.Min.Act.Timeout(" << mIdString;
     stream << ", " << mDescriptor->current_min;
     stream << ", " << mDescriptor->is_active.load();
     stream << ", " << isTimeout() << ")";
 }

 ndk::ScopedAStatus PowerHintSession::pause() {
     if (mSessionClosed) {
         ALOGE("Error: session is dead");
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     }
     if (!mDescriptor->is_active.load())
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     // Reset to default uclamp value.
     mDescriptor->is_active.store(false);
     setStale();
     if (ATRACE_ENABLED()) {
         traceSessionVal("active", mDescriptor->is_active.load());
     }
     updateUniveralBoostMode();
     PowerSessionManager::getInstance()->removeThreadsFromPowerSession(this);
     return ndk::ScopedAStatus::ok();
 }

 ndk::ScopedAStatus PowerHintSession::resume() {
     if (mSessionClosed) {
         ALOGE("Error: session is dead");
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     }
     if (mDescriptor->is_active.load())
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     mDescriptor->is_active.store(true);
     PowerSessionManager::getInstance()->addThreadsFromPowerSession(this);
     // resume boost
     setSessionUclampMin(mDescriptor->current_min);
     if (ATRACE_ENABLED()) {
         traceSessionVal("active", mDescriptor->is_active.load());
     }
     updateUniveralBoostMode();
     return ndk::ScopedAStatus::ok();
 }

 ndk::ScopedAStatus PowerHintSession::close() {
     bool sessionClosedExpectedToBe = false;
     if (!mSessionClosed.compare_exchange_strong(sessionClosedExpectedToBe, true)) {
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     }
     // Remove the session from PowerSessionManager first to avoid racing.
     PowerSessionManager::getInstance()->removePowerSession(this);
     mStaleTimerHandler->setSessionDead();
     mBoostTimerHandler->setSessionDead();
     setSessionUclampMin(0);
     mDescriptor->is_active.store(false);
     updateUniveralBoostMode();
     return ndk::ScopedAStatus::ok();
 }

 ndk::ScopedAStatus PowerHintSession::updateTargetWorkDuration(int64_t targetDurationNanos) {
     if (mSessionClosed) {
         ALOGE("Error: session is dead");
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     }
     if (targetDurationNanos <= 0) {
         ALOGE("Error: targetDurationNanos(%" PRId64 ") should bigger than 0", targetDurationNanos);
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
     }
     targetDurationNanos =
             targetDurationNanos * HintManager::GetInstance()->GetAdpfProfile()->mTargetTimeFactor;
     ALOGV("update target duration: %" PRId64 " ns", targetDurationNanos);

     mDescriptor->duration = std::chrono::nanoseconds(targetDurationNanos);
     if (ATRACE_ENABLED()) {
         traceSessionVal("target", mDescriptor->duration.count());
     }

     return ndk::ScopedAStatus::ok();
 }

 ndk::ScopedAStatus PowerHintSession::reportActualWorkDuration(
         const std::vector<WorkDuration> &actualDurations) {
     if (mSessionClosed) {
         ALOGE("Error: session is dead");
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     }
     if (mDescriptor->duration.count() == 0LL) {
         ALOGE("Expect to call updateTargetWorkDuration() first.");
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     }
     if (actualDurations.size() == 0) {
         ALOGE("Error: duration.size() shouldn't be %zu.", actualDurations.size());
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
     }
     if (!mDescriptor->is_active.load()) {
         ALOGE("Error: shouldn't report duration during pause state.");
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     }
     std::shared_ptr<AdpfConfig> adpfConfig = HintManager::GetInstance()->GetAdpfProfile();
     mDescriptor->update_count++;
     bool isFirstFrame = isTimeout();
     if (ATRACE_ENABLED()) {
         traceSessionVal("batch_size", actualDurations.size());
         traceSessionVal("actl_last", actualDurations.back().durationNanos);
         traceSessionVal("target", mDescriptor->duration.count());
         traceSessionVal("hint.count", mDescriptor->update_count);
         traceSessionVal("hint.overtime",
                         actualDurations.back().durationNanos - mDescriptor->duration.count() > 0);
     }

     mLastUpdatedTime.store(std::chrono::steady_clock::now());
     if (isFirstFrame) {
         if (isAppSession()) {
             tryToSendPowerHint("ADPF_FIRST_FRAME");
         }
         updateUniveralBoostMode();
     }

     disableTemporaryBoost();

     if (!adpfConfig->mPidOn) {
         setSessionUclampMin(adpfConfig->mUclampMinHigh);
         return ndk::ScopedAStatus::ok();
     }

     int64_t output = convertWorkDurationToBoostByPid(actualDurations);

     /* apply to all the threads in the group */
     int next_min = std::min(static_cast<int>(adpfConfig->mUclampMinHigh),
                             mDescriptor->current_min + static_cast<int>(output));
     next_min = std::max(static_cast<int>(adpfConfig->mUclampMinLow), next_min);
     setSessionUclampMin(next_min);

     return ndk::ScopedAStatus::ok();
 }

 ndk::ScopedAStatus PowerHintSession::sendHint(SessionHint hint) {
     if (mSessionClosed) {
         ALOGE("Error: session is dead");
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     }
     disableTemporaryBoost();
     std::shared_ptr<AdpfConfig> adpfConfig = HintManager::GetInstance()->GetAdpfProfile();
     switch (hint) {
         case SessionHint::CPU_LOAD_UP:
             mNextUclampMin.store(mDescriptor->current_min);
             mBoostTimerHandler->updateTimer(mDescriptor->duration * 2);
             setSessionUclampMin(adpfConfig->mUclampMinHigh);
             break;
         case SessionHint::CPU_LOAD_DOWN:
             setSessionUclampMin(adpfConfig->mUclampMinLow);
             break;
         case SessionHint::CPU_LOAD_RESET:
             mNextUclampMin.store(std::max(adpfConfig->mUclampMinInit,
                                           static_cast<uint32_t>(mDescriptor->current_min)));
             mBoostTimerHandler->updateTimer(duration_cast<nanoseconds>(
                     mDescriptor->duration * adpfConfig->mStaleTimeFactor / 2.0));
             setSessionUclampMin(adpfConfig->mUclampMinHigh);
             break;
         case SessionHint::CPU_LOAD_RESUME:
             setSessionUclampMin(mDescriptor->current_min);
             break;
         default:
             ALOGE("Error: hint is invalid");
             return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
     }
     tryToSendPowerHint(toString(hint));
     mLastUpdatedTime.store(std::chrono::steady_clock::now());
     if (ATRACE_ENABLED()) {
         mLastHintSent = static_cast<int>(hint);
         traceSessionVal("session_hint", static_cast<int>(hint));
     }
     return ndk::ScopedAStatus::ok();
 }

 ndk::ScopedAStatus PowerHintSession::setThreads(const std::vector<int32_t> &threadIds) {
     if (mSessionClosed) {
         ALOGE("Error: session is dead");
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
     }
     if (threadIds.size() == 0) {
         LOG(ERROR) << "Error: threadIds.size() shouldn't be " << threadIds.size();
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
     }

     PowerSessionManager::getInstance()->removeThreadsFromPowerSession(this);
     mDescriptor->threadIds.resize(threadIds.size());
     std::copy(threadIds.begin(), threadIds.end(), back_inserter(mDescriptor->threadIds));
     PowerSessionManager::getInstance()->addThreadsFromPowerSession(this);
     // init boost
     setSessionUclampMin(HintManager::GetInstance()->GetAdpfProfile()->mUclampMinInit);
     return ndk::ScopedAStatus::ok();
 }

 std::string AppHintDesc::toString() const {
     std::string out =
             StringPrintf("session %" PRIxPTR "\n", reinterpret_cast<uintptr_t>(this) & 0xffff);
     const int64_t durationNanos = duration.count();
     out.append(StringPrintf("  duration: %" PRId64 " ns\n", durationNanos));
     out.append(StringPrintf("  uclamp.min: %d \n", current_min));
     out.append(StringPrintf("  uid: %d, tgid: %d\n", uid, tgid));

     out.append("  threadIds: [");
     bool first = true;
     for (int tid : threadIds) {
         if (!first) {
             out.append(", ");
         }
         out.append(std::to_string(tid));
         first = false;
     }
     out.append("]\n");
     return out;
 }

 bool PowerHintSession::isActive() {
     return mDescriptor->is_active.load();
 }

 bool PowerHintSession::isTimeout() {
     auto now = std::chrono::steady_clock::now();
     time_point<steady_clock> staleTime =
             mLastUpdatedTime.load() +
             nanoseconds(static_cast<int64_t>(
                     mDescriptor->duration.count() *
                     HintManager::GetInstance()->GetAdpfProfile()->mStaleTimeFactor));
     return now >= staleTime;
 }

 const std::vector<int32_t> &PowerHintSession::getTidList() const {
     return mDescriptor->threadIds;
 }

 bool PowerHintSession::disableTemporaryBoost() {
     if (ATRACE_ENABLED()) {
         if (mLastHintSent != -1) {
             mLastHintSent = -1;
             traceSessionVal("session_hint", -1);
         }
     }

     // replace temporary uclamp_min value with true min
     std::optional<int> trueMin = mNextUclampMin.load();
     if (trueMin.has_value()) {
         std::lock_guard<std::mutex> guard(mSessionLock);
         mDescriptor->current_min = *trueMin;
         mNextUclampMin.store(std::nullopt);
         return true;
     }

     return false;
 }

 void PowerHintSession::setStale() {
     // Make sure any temporary boost is disabled
     disableTemporaryBoost();
     // Reset to default uclamp value.
     PowerSessionManager::getInstance()->setUclampMin(this, 0);
     // Deliver a task to check if all sessions are inactive.
     updateUniveralBoostMode();
     if (ATRACE_ENABLED()) {
         traceSessionVal("min", 0);
     }
 }

 void PowerHintSession::SessionTimerHandler::updateTimer(nanoseconds delay) {
     mTimeout.store(steady_clock::now() + delay);
     {
         std::lock_guard<std::mutex> guard(mMessageLock);
         sp<MessageHandler> selfPtr = sp<MessageHandler>::fromExisting(this);
         PowerHintMonitor::getInstance()->getLooper()->removeMessages(selfPtr);
         PowerHintMonitor::getInstance()->getLooper()->sendMessageDelayed(delay.count(), selfPtr,
                                                                          NULL);
     }
     if (ATRACE_ENABLED()) {
         mSession->traceSessionVal(("timer." + mName).c_str(), 0);
     }
 }

 void PowerHintSession::SessionTimerHandler::handleMessage(const Message &) {
     std::lock_guard<std::mutex> guard(mClosedLock);
     if (mIsSessionDead) {
         return;
     }
     time_point now = steady_clock::now();
     int64_t next = (mTimeout.load() - now).count();
     if (next > 0) {
         // Schedule for the stale timeout check.
         std::lock_guard<std::mutex> guard(mMessageLock);
         sp<MessageHandler> selfPtr = sp<MessageHandler>::fromExisting(this);
         PowerHintMonitor::getInstance()->getLooper()->removeMessages(selfPtr);
         PowerHintMonitor::getInstance()->getLooper()->sendMessageDelayed(next, selfPtr, NULL);
     } else {
         onTimeout();
     }
     if (ATRACE_ENABLED()) {
         mSession->traceSessionVal(("timer." + mName).c_str(), next > 0 ? 0 : 1);
     }
 }

 void PowerHintSession::SessionTimerHandler::setSessionDead() {
     std::lock_guard<std::mutex> guard(mClosedLock);
     mIsSessionDead = true;
     PowerHintMonitor::getInstance()->getLooper()->removeMessages(
             sp<MessageHandler>::fromExisting(this));
 }

 void PowerHintSession::StaleTimerHandler::updateTimer() {
     SessionTimerHandler::updateTimer(duration_cast<nanoseconds>(
             mSession->mDescriptor->duration *
             HintManager::GetInstance()->GetAdpfProfile()->mStaleTimeFactor));
 }

 void PowerHintSession::StaleTimerHandler::onTimeout() {
     mSession->setStale();
 }

 void PowerHintSession::BoostTimerHandler::onTimeout() {
     if (mSession->disableTemporaryBoost()) {
         mSession->setSessionUclampMin(mSession->getUclampMin(), false);
     }
 }

 }  // namespace pixel
 }  // namespace impl
 }  // namespace power
 }  // namespace hardware
 }  // namespace google
 }  // namespace aidl
	/*
	* Copyright 2021 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.
	*/

	#define LOG_TAG "powerhal-libperfmgr"
	#define ATRACE_TAG (ATRACE_TAG_POWER \| ATRACE_TAG_HAL)

	#include "PowerHintSession.h"

	#include <android-base/logging.h>
	#include <android-base/parsedouble.h>
	#include <android-base/properties.h>
	#include <android-base/stringprintf.h>
	#include <perfmgr/AdpfConfig.h>
	#include <private/android_filesystem_config.h>
	#include <sys/syscall.h>
	#include <time.h>
	#include <utils/Trace.h>

	#include <atomic>

	#include "PowerSessionManager.h"

	namespace aidl {
	namespace google {
	namespace hardware {
	namespace power {
	namespace impl {
	namespace pixel {

	using ::android::base::StringPrintf;
	using ::android::perfmgr::AdpfConfig;
	using ::android::perfmgr::HintManager;
	using std::chrono::duration_cast;
	using std::chrono::nanoseconds;

	namespace {

	static inline int64_t ns_to_100us(int64_t ns) {
	return ns / 100000;
	}

	} // namespace

	int64_t PowerHintSession::convertWorkDurationToBoostByPid(
	const std::vector<WorkDuration> &actualDurations) {
	std::shared_ptr<AdpfConfig> adpfConfig = HintManager::GetInstance()->GetAdpfProfile();
	const nanoseconds &targetDuration = mDescriptor->duration;
	int64_t &integral_error = mDescriptor->integral_error;
	int64_t &previous_error = mDescriptor->previous_error;
	uint64_t samplingWindowP = adpfConfig->mSamplingWindowP;
	uint64_t samplingWindowI = adpfConfig->mSamplingWindowI;
	uint64_t samplingWindowD = adpfConfig->mSamplingWindowD;
	int64_t targetDurationNanos = (int64_t)targetDuration.count();
	int64_t length = actualDurations.size();
	int64_t p_start =
	samplingWindowP == 0 \|\| samplingWindowP > length ? 0 : length - samplingWindowP;
	int64_t i_start =
	samplingWindowI == 0 \|\| samplingWindowI > length ? 0 : length - samplingWindowI;
	int64_t d_start =
	samplingWindowD == 0 \|\| samplingWindowD > length ? 0 : length - samplingWindowD;
	int64_t dt = ns_to_100us(targetDurationNanos);
	int64_t err_sum = 0;
	int64_t derivative_sum = 0;
	for (int64_t i = std::min({p_start, i_start, d_start}); i < length; i++) {
	int64_t actualDurationNanos = actualDurations[i].durationNanos;
	if (std::abs(actualDurationNanos) > targetDurationNanos * 20) {
	ALOGW("The actual duration is way far from the target (%" PRId64 " >> %" PRId64 ")",
	actualDurationNanos, targetDurationNanos);
	}
	// PID control algorithm
	int64_t error = ns_to_100us(actualDurationNanos - targetDurationNanos);
	if (i >= d_start) {
	derivative_sum += error - previous_error;
	}
	if (i >= p_start) {
	err_sum += error;
	}
	if (i >= i_start) {
	integral_error += error * dt;
	integral_error = std::min(adpfConfig->getPidIHighDivI(), integral_error);
	integral_error = std::max(adpfConfig->getPidILowDivI(), integral_error);
	}
	previous_error = error;
	}
	int64_t pOut = static_cast<int64_t>((err_sum > 0 ? adpfConfig->mPidPo : adpfConfig->mPidPu) *
	err_sum / (length - p_start));
	int64_t iOut = static_cast<int64_t>(adpfConfig->mPidI * integral_error);
	int64_t dOut =
	static_cast<int64_t>((derivative_sum > 0 ? adpfConfig->mPidDo : adpfConfig->mPidDu) *
	derivative_sum / dt / (length - d_start));

	int64_t output = pOut + iOut + dOut;
	if (ATRACE_ENABLED()) {
	traceSessionVal("pid.err", err_sum / (length - p_start));
	traceSessionVal("pid.integral", integral_error);
	traceSessionVal("pid.derivative", derivative_sum / dt / (length - d_start));
	traceSessionVal("pid.pOut", pOut);
	traceSessionVal("pid.iOut", iOut);
	traceSessionVal("pid.dOut", dOut);
	traceSessionVal("pid.output", output);
	}
	return output;
	}

	PowerHintSession::PowerHintSession(int32_t tgid, int32_t uid, const std::vector<int32_t> &threadIds,
	int64_t durationNanos)
	: mStaleTimerHandler(sp<StaleTimerHandler>::make(this)),
	mBoostTimerHandler(sp<BoostTimerHandler>::make(this)) {
	mDescriptor = new AppHintDesc(tgid, uid, threadIds);
	mDescriptor->duration = std::chrono::nanoseconds(durationNanos);
	mIdString = StringPrintf("%" PRId32 "-%" PRId32 "-%" PRIxPTR, mDescriptor->tgid,
	mDescriptor->uid, reinterpret_cast<uintptr_t>(this) & 0xffff);

	mPowerManagerHandler = PowerSessionManager::getInstance();
	mLastUpdatedTime.store(std::chrono::steady_clock::now());
	if (ATRACE_ENABLED()) {
	traceSessionVal("target", mDescriptor->duration.count());
	traceSessionVal("active", mDescriptor->is_active.load());
	}
	PowerSessionManager::getInstance()->addPowerSession(this);
	// init boost
	sendHint(SessionHint::CPU_LOAD_RESET);
	ALOGV("PowerHintSession created: %s", mDescriptor->toString().c_str());
	}

	PowerHintSession::~PowerHintSession() {
	close();
	ALOGV("PowerHintSession deleted: %s", mDescriptor->toString().c_str());
	if (ATRACE_ENABLED()) {
	traceSessionVal("target", 0);
	traceSessionVal("actl_last", 0);
	traceSessionVal("active", 0);
	}
	delete mDescriptor;
	}

	void PowerHintSession::traceSessionVal(char const *identifier, int64_t val) const {
	ATRACE_INT(StringPrintf("adpf.%s-%s", mIdString.c_str(), identifier).c_str(), val);
	}

	bool PowerHintSession::isAppSession() {
	// Check if uid is in range reserved for applications
	return mDescriptor->uid >= AID_APP_START;
	}

	void PowerHintSession::updateUniveralBoostMode() {
	if (!isAppSession()) {
	return;
	}
	if (ATRACE_ENABLED()) {
	const std::string tag = StringPrintf("%s:updateUniveralBoostMode()", mIdString.c_str());
	ATRACE_BEGIN(tag.c_str());
	}
	PowerHintMonitor::getInstance()->getLooper()->sendMessage(mPowerManagerHandler, NULL);
	if (ATRACE_ENABLED()) {
	ATRACE_END();
	}
	}

	void PowerHintSession::tryToSendPowerHint(std::string hint) {
	if (!mSupportedHints[hint].has_value()) {
	mSupportedHints[hint] = HintManager::GetInstance()->IsHintSupported(hint);
	}
	if (mSupportedHints[hint].value()) {
	HintManager::GetInstance()->DoHint(hint);
	}
	}

	int PowerHintSession::setSessionUclampMin(int32_t min, bool resetStale) {
	{
	std::lock_guard<std::mutex> guard(mSessionLock);
	mDescriptor->current_min = min;
	}
	if (min != 0 && resetStale) {
	mStaleTimerHandler->updateTimer();
	}
	PowerSessionManager::getInstance()->setUclampMin(this, min);

	if (ATRACE_ENABLED()) {
	traceSessionVal("min", min);
	}
	return 0;
	}

	int PowerHintSession::getUclampMin() {
	return mDescriptor->current_min;
	}

	void PowerHintSession::dumpToStream(std::ostream &stream) {
	stream << "ID.Min.Act.Timeout(" << mIdString;
	stream << ", " << mDescriptor->current_min;
	stream << ", " << mDescriptor->is_active.load();
	stream << ", " << isTimeout() << ")";
	}

	ndk::ScopedAStatus PowerHintSession::pause() {
	if (mSessionClosed) {
	ALOGE("Error: session is dead");
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	if (!mDescriptor->is_active.load())
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	// Reset to default uclamp value.
	mDescriptor->is_active.store(false);
	setStale();
	if (ATRACE_ENABLED()) {
	traceSessionVal("active", mDescriptor->is_active.load());
	}
	updateUniveralBoostMode();
	PowerSessionManager::getInstance()->removeThreadsFromPowerSession(this);
	return ndk::ScopedAStatus::ok();
	}

	ndk::ScopedAStatus PowerHintSession::resume() {
	if (mSessionClosed) {
	ALOGE("Error: session is dead");
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	if (mDescriptor->is_active.load())
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	mDescriptor->is_active.store(true);
	PowerSessionManager::getInstance()->addThreadsFromPowerSession(this);
	// resume boost
	setSessionUclampMin(mDescriptor->current_min);
	if (ATRACE_ENABLED()) {
	traceSessionVal("active", mDescriptor->is_active.load());
	}
	updateUniveralBoostMode();
	return ndk::ScopedAStatus::ok();
	}

	ndk::ScopedAStatus PowerHintSession::close() {
	bool sessionClosedExpectedToBe = false;
	if (!mSessionClosed.compare_exchange_strong(sessionClosedExpectedToBe, true)) {
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	// Remove the session from PowerSessionManager first to avoid racing.
	PowerSessionManager::getInstance()->removePowerSession(this);
	mStaleTimerHandler->setSessionDead();
	mBoostTimerHandler->setSessionDead();
	setSessionUclampMin(0);
	mDescriptor->is_active.store(false);
	updateUniveralBoostMode();
	return ndk::ScopedAStatus::ok();
	}

	ndk::ScopedAStatus PowerHintSession::updateTargetWorkDuration(int64_t targetDurationNanos) {
	if (mSessionClosed) {
	ALOGE("Error: session is dead");
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	if (targetDurationNanos <= 0) {
	ALOGE("Error: targetDurationNanos(%" PRId64 ") should bigger than 0", targetDurationNanos);
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
	}
	targetDurationNanos =
	targetDurationNanos * HintManager::GetInstance()->GetAdpfProfile()->mTargetTimeFactor;
	ALOGV("update target duration: %" PRId64 " ns", targetDurationNanos);

	mDescriptor->duration = std::chrono::nanoseconds(targetDurationNanos);
	if (ATRACE_ENABLED()) {
	traceSessionVal("target", mDescriptor->duration.count());
	}

	return ndk::ScopedAStatus::ok();
	}

	ndk::ScopedAStatus PowerHintSession::reportActualWorkDuration(
	const std::vector<WorkDuration> &actualDurations) {
	if (mSessionClosed) {
	ALOGE("Error: session is dead");
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	if (mDescriptor->duration.count() == 0LL) {
	ALOGE("Expect to call updateTargetWorkDuration() first.");
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	if (actualDurations.size() == 0) {
	ALOGE("Error: duration.size() shouldn't be %zu.", actualDurations.size());
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
	}
	if (!mDescriptor->is_active.load()) {
	ALOGE("Error: shouldn't report duration during pause state.");
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	std::shared_ptr<AdpfConfig> adpfConfig = HintManager::GetInstance()->GetAdpfProfile();
	mDescriptor->update_count++;
	bool isFirstFrame = isTimeout();
	if (ATRACE_ENABLED()) {
	traceSessionVal("batch_size", actualDurations.size());
	traceSessionVal("actl_last", actualDurations.back().durationNanos);
	traceSessionVal("target", mDescriptor->duration.count());
	traceSessionVal("hint.count", mDescriptor->update_count);
	traceSessionVal("hint.overtime",
	actualDurations.back().durationNanos - mDescriptor->duration.count() > 0);
	}

	mLastUpdatedTime.store(std::chrono::steady_clock::now());
	if (isFirstFrame) {
	if (isAppSession()) {
	tryToSendPowerHint("ADPF_FIRST_FRAME");
	}
	updateUniveralBoostMode();
	}

	disableTemporaryBoost();

	if (!adpfConfig->mPidOn) {
	setSessionUclampMin(adpfConfig->mUclampMinHigh);
	return ndk::ScopedAStatus::ok();
	}

	int64_t output = convertWorkDurationToBoostByPid(actualDurations);

	/* apply to all the threads in the group */
	int next_min = std::min(static_cast<int>(adpfConfig->mUclampMinHigh),
	mDescriptor->current_min + static_cast<int>(output));
	next_min = std::max(static_cast<int>(adpfConfig->mUclampMinLow), next_min);
	setSessionUclampMin(next_min);

	return ndk::ScopedAStatus::ok();
	}

	ndk::ScopedAStatus PowerHintSession::sendHint(SessionHint hint) {
	if (mSessionClosed) {
	ALOGE("Error: session is dead");
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	disableTemporaryBoost();
	std::shared_ptr<AdpfConfig> adpfConfig = HintManager::GetInstance()->GetAdpfProfile();
	switch (hint) {
	case SessionHint::CPU_LOAD_UP:
	mNextUclampMin.store(mDescriptor->current_min);
	mBoostTimerHandler->updateTimer(mDescriptor->duration * 2);
	setSessionUclampMin(adpfConfig->mUclampMinHigh);
	break;
	case SessionHint::CPU_LOAD_DOWN:
	setSessionUclampMin(adpfConfig->mUclampMinLow);
	break;
	case SessionHint::CPU_LOAD_RESET:
	mNextUclampMin.store(std::max(adpfConfig->mUclampMinInit,
	static_cast<uint32_t>(mDescriptor->current_min)));
	mBoostTimerHandler->updateTimer(duration_cast<nanoseconds>(
	mDescriptor->duration * adpfConfig->mStaleTimeFactor / 2.0));
	setSessionUclampMin(adpfConfig->mUclampMinHigh);
	break;
	case SessionHint::CPU_LOAD_RESUME:
	setSessionUclampMin(mDescriptor->current_min);
	break;
	default:
	ALOGE("Error: hint is invalid");
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
	}
	tryToSendPowerHint(toString(hint));
	mLastUpdatedTime.store(std::chrono::steady_clock::now());
	if (ATRACE_ENABLED()) {
	mLastHintSent = static_cast<int>(hint);
	traceSessionVal("session_hint", static_cast<int>(hint));
	}
	return ndk::ScopedAStatus::ok();
	}

	ndk::ScopedAStatus PowerHintSession::setThreads(const std::vector<int32_t> &threadIds) {
	if (mSessionClosed) {
	ALOGE("Error: session is dead");
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	if (threadIds.size() == 0) {
	LOG(ERROR) << "Error: threadIds.size() shouldn't be " << threadIds.size();
	return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
	}

	PowerSessionManager::getInstance()->removeThreadsFromPowerSession(this);
	mDescriptor->threadIds.resize(threadIds.size());
	std::copy(threadIds.begin(), threadIds.end(), back_inserter(mDescriptor->threadIds));
	PowerSessionManager::getInstance()->addThreadsFromPowerSession(this);
	// init boost
	setSessionUclampMin(HintManager::GetInstance()->GetAdpfProfile()->mUclampMinInit);
	return ndk::ScopedAStatus::ok();
	}

	std::string AppHintDesc::toString() const {
	std::string out =
	StringPrintf("session %" PRIxPTR "\n", reinterpret_cast<uintptr_t>(this) & 0xffff);
	const int64_t durationNanos = duration.count();
	out.append(StringPrintf(" duration: %" PRId64 " ns\n", durationNanos));
	out.append(StringPrintf(" uclamp.min: %d \n", current_min));
	out.append(StringPrintf(" uid: %d, tgid: %d\n", uid, tgid));

	out.append(" threadIds: [");
	bool first = true;
	for (int tid : threadIds) {
	if (!first) {
	out.append(", ");
	}
	out.append(std::to_string(tid));
	first = false;
	}
	out.append("]\n");
	return out;
	}

	bool PowerHintSession::isActive() {
	return mDescriptor->is_active.load();
	}

	bool PowerHintSession::isTimeout() {
	auto now = std::chrono::steady_clock::now();
	time_point<steady_clock> staleTime =
	mLastUpdatedTime.load() +
	nanoseconds(static_cast<int64_t>(
	mDescriptor->duration.count() *
	HintManager::GetInstance()->GetAdpfProfile()->mStaleTimeFactor));
	return now >= staleTime;
	}

	const std::vector<int32_t> &PowerHintSession::getTidList() const {
	return mDescriptor->threadIds;
	}

	bool PowerHintSession::disableTemporaryBoost() {
	if (ATRACE_ENABLED()) {
	if (mLastHintSent != -1) {
	mLastHintSent = -1;
	traceSessionVal("session_hint", -1);
	}
	}

	// replace temporary uclamp_min value with true min
	std::optional<int> trueMin = mNextUclampMin.load();
	if (trueMin.has_value()) {
	std::lock_guard<std::mutex> guard(mSessionLock);
	mDescriptor->current_min = *trueMin;
	mNextUclampMin.store(std::nullopt);
	return true;
	}

	return false;
	}

	void PowerHintSession::setStale() {
	// Make sure any temporary boost is disabled
	disableTemporaryBoost();
	// Reset to default uclamp value.
	PowerSessionManager::getInstance()->setUclampMin(this, 0);
	// Deliver a task to check if all sessions are inactive.
	updateUniveralBoostMode();
	if (ATRACE_ENABLED()) {
	traceSessionVal("min", 0);
	}
	}

	void PowerHintSession::SessionTimerHandler::updateTimer(nanoseconds delay) {
	mTimeout.store(steady_clock::now() + delay);
	{
	std::lock_guard<std::mutex> guard(mMessageLock);
	sp<MessageHandler> selfPtr = sp<MessageHandler>::fromExisting(this);
	PowerHintMonitor::getInstance()->getLooper()->removeMessages(selfPtr);
	PowerHintMonitor::getInstance()->getLooper()->sendMessageDelayed(delay.count(), selfPtr,
	NULL);
	}
	if (ATRACE_ENABLED()) {
	mSession->traceSessionVal(("timer." + mName).c_str(), 0);
	}
	}

	void PowerHintSession::SessionTimerHandler::handleMessage(const Message &) {
	std::lock_guard<std::mutex> guard(mClosedLock);
	if (mIsSessionDead) {
	return;
	}
	time_point now = steady_clock::now();
	int64_t next = (mTimeout.load() - now).count();
	if (next > 0) {
	// Schedule for the stale timeout check.
	std::lock_guard<std::mutex> guard(mMessageLock);
	sp<MessageHandler> selfPtr = sp<MessageHandler>::fromExisting(this);
	PowerHintMonitor::getInstance()->getLooper()->removeMessages(selfPtr);
	PowerHintMonitor::getInstance()->getLooper()->sendMessageDelayed(next, selfPtr, NULL);
	} else {
	onTimeout();
	}
	if (ATRACE_ENABLED()) {
	mSession->traceSessionVal(("timer." + mName).c_str(), next > 0 ? 0 : 1);
	}
	}

	void PowerHintSession::SessionTimerHandler::setSessionDead() {
	std::lock_guard<std::mutex> guard(mClosedLock);
	mIsSessionDead = true;
	PowerHintMonitor::getInstance()->getLooper()->removeMessages(
	sp<MessageHandler>::fromExisting(this));
	}

	void PowerHintSession::StaleTimerHandler::updateTimer() {
	SessionTimerHandler::updateTimer(duration_cast<nanoseconds>(
	mSession->mDescriptor->duration *
	HintManager::GetInstance()->GetAdpfProfile()->mStaleTimeFactor));
	}

	void PowerHintSession::StaleTimerHandler::onTimeout() {
	mSession->setStale();
	}

	void PowerHintSession::BoostTimerHandler::onTimeout() {
	if (mSession->disableTemporaryBoost()) {
	mSession->setSessionUclampMin(mSession->getUclampMin(), false);
	}
	}

	} // namespace pixel
	} // namespace impl
	} // namespace power
	} // namespace hardware
	} // namespace google
	} // namespace aidl