92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
/*
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* Copyright 2019 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 <android-base/thread_annotations.h>
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#include <mutex>
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#include <unordered_map>
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#include <vector>
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#include "SchedulerUtils.h"
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#include "VSyncTracker.h"
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namespace android::scheduler {
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class VSyncPredictor : public VSyncTracker {
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public:
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/*
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* \param [in] idealPeriod The initial ideal period to use.
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* \param [in] historySize The internal amount of entries to store in the model.
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* \param [in] minimumSamplesForPrediction The minimum number of samples to collect before
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* predicting. \param [in] outlierTolerancePercent a number 0 to 100 that will be used to filter
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* samples that fall outlierTolerancePercent from an anticipated vsync event.
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*/
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VSyncPredictor(nsecs_t idealPeriod, size_t historySize, size_t minimumSamplesForPrediction,
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uint32_t outlierTolerancePercent);
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~VSyncPredictor();
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bool addVsyncTimestamp(nsecs_t timestamp) final;
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nsecs_t nextAnticipatedVSyncTimeFrom(nsecs_t timePoint) const final;
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nsecs_t currentPeriod() const final;
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void resetModel() final;
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/*
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* Inform the model that the period is anticipated to change to a new value.
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* model will use the period parameter to predict vsync events until enough
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* timestamps with the new period have been collected.
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*
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* \param [in] period The new period that should be used.
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*/
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void setPeriod(nsecs_t period) final;
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/* Query if the model is in need of more samples to make a prediction.
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* \return True, if model would benefit from more samples, False if not.
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*/
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bool needsMoreSamples() const final;
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std::tuple<nsecs_t /* slope */, nsecs_t /* intercept */> getVSyncPredictionModel() const;
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void dump(std::string& result) const final;
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private:
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VSyncPredictor(VSyncPredictor const&) = delete;
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VSyncPredictor& operator=(VSyncPredictor const&) = delete;
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void clearTimestamps() REQUIRES(mMutex);
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inline void traceInt64If(const char* name, int64_t value) const;
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bool const mTraceOn;
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size_t const kHistorySize;
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size_t const kMinimumSamplesForPrediction;
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size_t const kOutlierTolerancePercent;
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std::mutex mutable mMutex;
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size_t next(int i) const REQUIRES(mMutex);
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bool validate(nsecs_t timestamp) const REQUIRES(mMutex);
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std::tuple<nsecs_t, nsecs_t> getVSyncPredictionModel(std::lock_guard<std::mutex> const&) const
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REQUIRES(mMutex);
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nsecs_t mIdealPeriod GUARDED_BY(mMutex);
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std::optional<nsecs_t> mKnownTimestamp GUARDED_BY(mMutex);
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std::unordered_map<nsecs_t, std::tuple<nsecs_t, nsecs_t>> mutable mRateMap GUARDED_BY(mMutex);
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int mLastTimestampIndex GUARDED_BY(mMutex) = 0;
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std::vector<nsecs_t> mTimestamps GUARDED_BY(mMutex);
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};
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} // namespace android::scheduler
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