112 lines
3.5 KiB
C++
112 lines
3.5 KiB
C++
/*
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* Copyright (C) 2021 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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#pragma once
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#include <aidl/android/hardware/power/WorkDuration.h>
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#include <perfmgr/HintManager.h>
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#include <chrono>
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#include <thread>
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#include <unordered_map>
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#include <vector>
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#include "AdaptiveCpuConfig.h"
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#include "AdaptiveCpuStats.h"
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#include "Device.h"
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#include "KernelCpuFeatureReader.h"
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#include "Model.h"
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#include "WorkDurationProcessor.h"
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namespace aidl {
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namespace google {
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namespace hardware {
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namespace power {
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namespace impl {
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namespace pixel {
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using std::chrono_literals::operator""ms;
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using ::aidl::android::hardware::power::WorkDuration;
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using ::android::perfmgr::HintManager;
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// Applies CPU frequency hints infered by an ML model based on the recent CPU statistics and work
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// durations.
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// This class's public members are not synchronised and should not be used from multiple threads,
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// with the exception of ReportWorkDuration, which can be called from an arbitrary thread.
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class AdaptiveCpu {
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public:
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AdaptiveCpu();
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bool IsEnabled() const;
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// Called when the Adaptive CPU hint is received. This method enables/disables the Adaptive CPU
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// thread.
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void HintReceived(bool enable);
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// Reports work durations for processing. This method returns immediately as work durations are
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// processed asynchonuously.
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void ReportWorkDurations(const std::vector<WorkDuration> &workDurations,
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std::chrono::nanoseconds targetDuration);
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// Dump info to a file descriptor. Called when dumping service info.
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void DumpToFd(int fd) const;
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// When PowerExt receives a hint with this name, HintReceived() is called.
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static constexpr char HINT_NAME[] = "ADAPTIVE_CPU";
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private:
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void StartThread();
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void SuspendThread();
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// The main loop of Adaptive CPU, which runs in a separate thread.
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void RunMainLoop();
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void WaitForEnabledAndWorkDurations();
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Model mModel;
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WorkDurationProcessor mWorkDurationProcessor;
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KernelCpuFeatureReader mKernelCpuFeatureReader;
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AdaptiveCpuStats mAdaptiveCpuStats;
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const TimeSource mTimeSource;
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// The thread in which work durations are processed.
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std::thread mLoopThread;
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// Guards against creating multiple threads in the case HintReceived(true) is called on separate
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// threads simultaneously.
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std::mutex mThreadCreationMutex;
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// Used when waiting in WaitForEnabledAndWorkDurations().
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std::mutex mWaitMutex;
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// A condition variable that will be notified when new work durations arrive.
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std::condition_variable mWorkDurationsAvailableCondition;
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volatile bool mIsEnabled = false;
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bool mIsInitialized = false;
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volatile bool mShouldReloadConfig = false;
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std::chrono::nanoseconds mLastEnabledHintTime;
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std::chrono::nanoseconds mLastThrottleHintTime;
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Device mDevice;
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AdaptiveCpuConfig mConfig = AdaptiveCpuConfig::DEFAULT;
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};
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} // namespace pixel
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} // namespace impl
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} // namespace power
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} // namespace hardware
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} // namespace google
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} // namespace aidl
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