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/*
* Copyright (C) 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-adaptivecpu"
#define ATRACE_TAG (ATRACE_TAG_POWER | ATRACE_TAG_HAL)
#include "AdaptiveCpu.h"
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <perfmgr/HintManager.h>
#include <sys/resource.h>
#include <utils/Trace.h>
#include <chrono>
#include <deque>
#include <numeric>
#include "CpuLoadReaderSysDevices.h"
#include "Model.h"
namespace aidl {
namespace google {
namespace hardware {
namespace power {
namespace impl {
namespace pixel {
using ::android::perfmgr::HintManager;
// We pass the previous N ModelInputs to the model, including the most recent ModelInput.
constexpr uint32_t kNumHistoricalModelInputs = 3;
// TODO(b/207662659): Add config for changing between different reader types.
AdaptiveCpu::AdaptiveCpu() {}
bool AdaptiveCpu::IsEnabled() const {
return mIsEnabled;
}
void AdaptiveCpu::HintReceived(bool enable) {
ATRACE_CALL();
LOG(INFO) << "AdaptiveCpu received hint: enable=" << enable;
if (enable) {
StartThread();
} else {
SuspendThread();
}
}
void AdaptiveCpu::StartThread() {
ATRACE_CALL();
std::lock_guard lock(mThreadCreationMutex);
LOG(INFO) << "Starting AdaptiveCpu thread";
mIsEnabled = true;
mShouldReloadConfig = true;
mLastEnabledHintTime = mTimeSource.GetTime();
if (!mLoopThread.joinable()) {
mLoopThread = std::thread([&]() {
pthread_setname_np(pthread_self(), "AdaptiveCpu");
// Parent threads may have higher priorities, so we reset to the default.
int ret = setpriority(PRIO_PROCESS, 0, 0);
if (ret != 0) {
PLOG(ERROR) << "setpriority on AdaptiveCpu thread failed: " << ret;
}
LOG(INFO) << "Started AdaptiveCpu thread successfully";
RunMainLoop();
LOG(ERROR) << "AdaptiveCpu thread ended, this should never happen!";
});
}
}
void AdaptiveCpu::SuspendThread() {
ATRACE_CALL();
LOG(INFO) << "Stopping AdaptiveCpu thread";
// This stops the thread from receiving work durations in ReportWorkDurations, which means the
// thread blocks indefinitely.
mIsEnabled = false;
}
void AdaptiveCpu::ReportWorkDurations(const std::vector<WorkDuration> &workDurations,
std::chrono::nanoseconds targetDuration) {
ATRACE_CALL();
if (!mIsEnabled) {
return;
}
if (!mWorkDurationProcessor.ReportWorkDurations(workDurations, targetDuration)) {
mIsEnabled = false;
return;
}
mWorkDurationsAvailableCondition.notify_one();
}
void AdaptiveCpu::WaitForEnabledAndWorkDurations() {
ATRACE_CALL();
std::unique_lock<std::mutex> lock(mWaitMutex);
// TODO(b/188770301) Once the gating logic is implemented, don't block indefinitely.
mWorkDurationsAvailableCondition.wait(
lock, [&] { return mIsEnabled && mWorkDurationProcessor.HasWorkDurations(); });
}
void AdaptiveCpu::RunMainLoop() {
ATRACE_CALL();
std::deque<ModelInput> historicalModelInputs;
ThrottleDecision previousThrottleDecision = ThrottleDecision::NO_THROTTLE;
while (true) {
ATRACE_NAME("loop");
WaitForEnabledAndWorkDurations();
if (mLastEnabledHintTime + mConfig.enabledHintTimeout < mTimeSource.GetTime()) {
LOG(INFO) << "Adaptive CPU hint timed out, last enabled time="
<< mLastEnabledHintTime.count() << "ns";
mIsEnabled = false;
continue;
}
if (mShouldReloadConfig) {
if (!AdaptiveCpuConfig::ReadFromSystemProperties(&mConfig)) {
mIsEnabled = false;
continue;
}
LOG(INFO) << "Read config: " << mConfig;
mShouldReloadConfig = false;
}
ATRACE_BEGIN("compute");
mAdaptiveCpuStats.RegisterStartRun();
if (!mIsInitialized) {
if (!mKernelCpuFeatureReader.Init()) {
mIsEnabled = false;
continue;
}
mDevice = ReadDevice();
mIsInitialized = true;
}
ModelInput modelInput;
modelInput.previousThrottleDecision = previousThrottleDecision;
modelInput.workDurationFeatures = mWorkDurationProcessor.GetFeatures();
LOG(VERBOSE) << "Got work durations: count=" << modelInput.workDurationFeatures.numDurations
<< ", average=" << modelInput.workDurationFeatures.averageDuration.count()
<< "ns";
if (modelInput.workDurationFeatures.numDurations == 0) {
continue;
}
if (!mKernelCpuFeatureReader.GetRecentCpuFeatures(&modelInput.cpuPolicyAverageFrequencyHz,
&modelInput.cpuCoreIdleTimesPercentage)) {
mIsEnabled = false;
continue;
}
modelInput.LogToAtrace();
historicalModelInputs.push_back(modelInput);
if (historicalModelInputs.size() > kNumHistoricalModelInputs) {
historicalModelInputs.pop_front();
}
const ThrottleDecision throttleDecision = mModel.Run(historicalModelInputs, mConfig);
LOG(VERBOSE) << "Model decision: " << static_cast<uint32_t>(throttleDecision);
ATRACE_INT("AdaptiveCpu_throttleDecision", static_cast<uint32_t>(throttleDecision));
{
ATRACE_NAME("sendHints");
const auto now = mTimeSource.GetTime();
// Resend the throttle hints, even if they've not changed, if the previous send is close
// to timing out. We define "close to" as half the hint timeout, as we can't guarantee
// we will run again before the actual timeout.
const bool throttleHintMayTimeout =
now - mLastThrottleHintTime > mConfig.hintTimeout / 2;
if (throttleDecision != previousThrottleDecision || throttleHintMayTimeout) {
ATRACE_NAME("sendNewHints");
mLastThrottleHintTime = now;
for (const auto &hintName : THROTTLE_DECISION_TO_HINT_NAMES.at(throttleDecision)) {
HintManager::GetInstance()->DoHint(hintName, mConfig.hintTimeout);
}
}
if (throttleDecision != previousThrottleDecision) {
ATRACE_NAME("endOldHints");
for (const auto &hintName :
THROTTLE_DECISION_TO_HINT_NAMES.at(previousThrottleDecision)) {
HintManager::GetInstance()->EndHint(hintName);
}
previousThrottleDecision = throttleDecision;
}
}
mAdaptiveCpuStats.RegisterSuccessfulRun(previousThrottleDecision, throttleDecision,
modelInput.workDurationFeatures, mConfig);
ATRACE_END(); // compute
{
ATRACE_NAME("sleep");
std::this_thread::sleep_for(mConfig.iterationSleepDuration);
}
}
}
void AdaptiveCpu::DumpToFd(int fd) const {
std::stringstream result;
result << "========== Begin Adaptive CPU stats ==========\n";
result << "Enabled: " << mIsEnabled << "\n";
result << "Config: " << mConfig << "\n";
mKernelCpuFeatureReader.DumpToStream(result);
mAdaptiveCpuStats.DumpToStream(result);
result << "========== End Adaptive CPU stats ==========\n";
if (!::android::base::WriteStringToFd(result.str(), fd)) {
PLOG(ERROR) << "Failed to dump state to fd";
}
}
} // namespace pixel
} // namespace impl
} // namespace power
} // namespace hardware
} // namespace google
} // namespace aidl
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