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