116 lines
4.0 KiB
C++
116 lines
4.0 KiB
C++
/*
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* Copyright 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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#define ATRACE_TAG ATRACE_TAG_GRAPHICS
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#include <scheduler/Fps.h>
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#include <scheduler/Timer.h>
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#include "VsyncSchedule.h"
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#include "VSyncDispatchTimerQueue.h"
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#include "VSyncPredictor.h"
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#include "VSyncReactor.h"
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#include "../TracedOrdinal.h"
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namespace android::scheduler {
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class VsyncSchedule::PredictedVsyncTracer {
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// Invoked from the thread of the VsyncDispatch owned by this VsyncSchedule.
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constexpr auto makeVsyncCallback() {
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return [this](nsecs_t, nsecs_t, nsecs_t) {
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mParity = !mParity;
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schedule();
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};
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}
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public:
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explicit PredictedVsyncTracer(VsyncDispatch& dispatch)
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: mRegistration(dispatch, makeVsyncCallback(), __func__) {
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schedule();
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}
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private:
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void schedule() { mRegistration.schedule({0, 0, 0}); }
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TracedOrdinal<bool> mParity = {"VSYNC-predicted", 0};
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VSyncCallbackRegistration mRegistration;
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};
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VsyncSchedule::VsyncSchedule(FeatureFlags features)
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: mTracker(createTracker()),
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mDispatch(createDispatch(*mTracker)),
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mController(createController(*mTracker, features)) {
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if (features.test(Feature::kTracePredictedVsync)) {
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mTracer = std::make_unique<PredictedVsyncTracer>(*mDispatch);
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}
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}
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VsyncSchedule::VsyncSchedule(TrackerPtr tracker, DispatchPtr dispatch, ControllerPtr controller)
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: mTracker(std::move(tracker)),
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mDispatch(std::move(dispatch)),
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mController(std::move(controller)) {}
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VsyncSchedule::VsyncSchedule(VsyncSchedule&&) = default;
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VsyncSchedule::~VsyncSchedule() = default;
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void VsyncSchedule::dump(std::string& out) const {
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out.append("VsyncController:\n");
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mController->dump(out);
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out.append("VsyncDispatch:\n");
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mDispatch->dump(out);
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}
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VsyncSchedule::TrackerPtr VsyncSchedule::createTracker() {
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// TODO(b/144707443): Tune constants.
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constexpr nsecs_t kInitialPeriod = (60_Hz).getPeriodNsecs();
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constexpr size_t kHistorySize = 20;
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constexpr size_t kMinSamplesForPrediction = 6;
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constexpr uint32_t kDiscardOutlierPercent = 20;
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return std::make_unique<VSyncPredictor>(kInitialPeriod, kHistorySize, kMinSamplesForPrediction,
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kDiscardOutlierPercent);
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}
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VsyncSchedule::DispatchPtr VsyncSchedule::createDispatch(VsyncTracker& tracker) {
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using namespace std::chrono_literals;
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// TODO(b/144707443): Tune constants.
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constexpr std::chrono::nanoseconds kGroupDispatchWithin = 500us;
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constexpr std::chrono::nanoseconds kSnapToSameVsyncWithin = 3ms;
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return std::make_unique<VSyncDispatchTimerQueue>(std::make_unique<Timer>(), tracker,
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kGroupDispatchWithin.count(),
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kSnapToSameVsyncWithin.count());
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}
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VsyncSchedule::ControllerPtr VsyncSchedule::createController(VsyncTracker& tracker,
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FeatureFlags features) {
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// TODO(b/144707443): Tune constants.
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constexpr size_t kMaxPendingFences = 20;
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const bool hasKernelIdleTimer = features.test(Feature::kKernelIdleTimer);
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auto reactor = std::make_unique<VSyncReactor>(std::make_unique<SystemClock>(), tracker,
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kMaxPendingFences, hasKernelIdleTimer);
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reactor->setIgnorePresentFences(!features.test(Feature::kPresentFences));
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return reactor;
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}
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} // namespace android::scheduler
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