diff --git a/services/surfaceflinger/Scheduler/LayerHistory.h b/services/surfaceflinger/Scheduler/LayerHistory.h
index 92236f5..8d56951 100644
--- a/services/surfaceflinger/Scheduler/LayerHistory.h
+++ b/services/surfaceflinger/Scheduler/LayerHistory.h
@@ -31,11 +31,9 @@
 namespace android {
 
 class Layer;
-class TestableScheduler;
 
 namespace scheduler {
 
-class LayerHistoryTest;
 class LayerInfo;
 
 class LayerHistory {
@@ -75,8 +73,8 @@
     std::string dump() const;
 
 private:
-    friend LayerHistoryTest;
-    friend TestableScheduler;
+    friend class LayerHistoryTest;
+    friend class TestableScheduler;
 
     using LayerPair = std::pair<Layer*, std::unique_ptr<LayerInfo>>;
     using LayerInfos = std::vector<LayerPair>;
diff --git a/services/surfaceflinger/Scheduler/RefreshRateConfigs.h b/services/surfaceflinger/Scheduler/RefreshRateConfigs.h
index 8a1c206..492feb1 100644
--- a/services/surfaceflinger/Scheduler/RefreshRateConfigs.h
+++ b/services/surfaceflinger/Scheduler/RefreshRateConfigs.h
@@ -37,11 +37,11 @@
 
 using namespace std::chrono_literals;
 
-enum class RefreshRateConfigEvent : unsigned { None = 0b0, Changed = 0b1 };
+enum class DisplayModeEvent : unsigned { None = 0b0, Changed = 0b1 };
 
-inline RefreshRateConfigEvent operator|(RefreshRateConfigEvent lhs, RefreshRateConfigEvent rhs) {
-    using T = std::underlying_type_t<RefreshRateConfigEvent>;
-    return static_cast<RefreshRateConfigEvent>(static_cast<T>(lhs) | static_cast<T>(rhs));
+inline DisplayModeEvent operator|(DisplayModeEvent lhs, DisplayModeEvent rhs) {
+    using T = std::underlying_type_t<DisplayModeEvent>;
+    return static_cast<DisplayModeEvent>(static_cast<T>(lhs) | static_cast<T>(rhs));
 }
 
 using FrameRateOverride = DisplayEventReceiver::Event::FrameRateOverride;
diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index 4d72798..cbe4552 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -46,11 +46,8 @@
 #include "OneShotTimer.h"
 #include "SchedulerUtils.h"
 #include "SurfaceFlingerProperties.h"
-#include "Timer.h"
-#include "VSyncDispatchTimerQueue.h"
 #include "VSyncPredictor.h"
 #include "VSyncReactor.h"
-#include "VsyncController.h"
 
 #define RETURN_IF_INVALID_HANDLE(handle, ...)                        \
     do {                                                             \
@@ -60,68 +57,14 @@
         }                                                            \
     } while (false)
 
-using namespace std::string_literals;
+namespace android::scheduler {
 
-namespace android {
-
-using gui::WindowInfo;
-
-namespace {
-
-std::unique_ptr<scheduler::VSyncTracker> createVSyncTracker() {
-    // TODO(b/144707443): Tune constants.
-    constexpr int kDefaultRate = 60;
-    constexpr auto initialPeriod = std::chrono::duration<nsecs_t, std::ratio<1, kDefaultRate>>(1);
-    constexpr nsecs_t idealPeriod =
-            std::chrono::duration_cast<std::chrono::nanoseconds>(initialPeriod).count();
-    constexpr size_t vsyncTimestampHistorySize = 20;
-    constexpr size_t minimumSamplesForPrediction = 6;
-    constexpr uint32_t discardOutlierPercent = 20;
-    return std::make_unique<scheduler::VSyncPredictor>(idealPeriod, vsyncTimestampHistorySize,
-                                                       minimumSamplesForPrediction,
-                                                       discardOutlierPercent);
-}
-
-std::unique_ptr<scheduler::VSyncDispatch> createVSyncDispatch(scheduler::VSyncTracker& tracker) {
-    // TODO(b/144707443): Tune constants.
-    constexpr std::chrono::nanoseconds vsyncMoveThreshold = 3ms;
-    constexpr std::chrono::nanoseconds timerSlack = 500us;
-    return std::make_unique<
-            scheduler::VSyncDispatchTimerQueue>(std::make_unique<scheduler::Timer>(), tracker,
-                                                timerSlack.count(), vsyncMoveThreshold.count());
-}
-
-const char* toContentDetectionString(bool useContentDetection) {
-    return useContentDetection ? "on" : "off";
-}
-
-} // namespace
-
-class PredictedVsyncTracer {
-public:
-    PredictedVsyncTracer(scheduler::VSyncDispatch& dispatch)
-          : mRegistration(dispatch, std::bind(&PredictedVsyncTracer::callback, this),
-                          "PredictedVsyncTracer") {
-        scheduleRegistration();
-    }
-
-private:
-    TracedOrdinal<bool> mParity = {"VSYNC-predicted", 0};
-    scheduler::VSyncCallbackRegistration mRegistration;
-
-    void scheduleRegistration() { mRegistration.schedule({0, 0, 0}); }
-
-    void callback() {
-        mParity = !mParity;
-        scheduleRegistration();
-    }
-};
-
-Scheduler::Scheduler(ICompositor& compositor, ISchedulerCallback& callback, Options options)
-      : impl::MessageQueue(compositor), mOptions(options), mSchedulerCallback(callback) {}
+Scheduler::Scheduler(ICompositor& compositor, ISchedulerCallback& callback, FeatureFlags features)
+      : impl::MessageQueue(compositor), mFeatures(features), mSchedulerCallback(callback) {}
 
 void Scheduler::startTimers() {
     using namespace sysprop;
+    using namespace std::string_literals;
 
     if (const int64_t millis = set_touch_timer_ms(0); millis > 0) {
         // Touch events are coming to SF every 100ms, so the timer needs to be higher than that
@@ -154,27 +97,14 @@
     }
 }
 
-void Scheduler::createVsyncSchedule(bool supportKernelTimer) {
-    auto clock = std::make_unique<scheduler::SystemClock>();
-    auto tracker = createVSyncTracker();
-    auto dispatch = createVSyncDispatch(*tracker);
-
-    // TODO(b/144707443): Tune constants.
-    constexpr size_t pendingFenceLimit = 20;
-    auto controller =
-            std::make_unique<scheduler::VSyncReactor>(std::move(clock), *tracker, pendingFenceLimit,
-                                                      supportKernelTimer);
-    mVsyncSchedule = {std::move(controller), std::move(tracker), std::move(dispatch)};
-
-    if (base::GetBoolProperty("debug.sf.show_predicted_vsync", false)) {
-        mPredictedVsyncTracer = std::make_unique<PredictedVsyncTracer>(*mVsyncSchedule.dispatch);
-    }
+void Scheduler::createVsyncSchedule(FeatureFlags features) {
+    mVsyncSchedule.emplace(features);
 }
 
 std::unique_ptr<VSyncSource> Scheduler::makePrimaryDispSyncSource(
         const char* name, std::chrono::nanoseconds workDuration,
         std::chrono::nanoseconds readyDuration, bool traceVsync) {
-    return std::make_unique<scheduler::DispSyncSource>(*mVsyncSchedule.dispatch, workDuration,
+    return std::make_unique<scheduler::DispSyncSource>(getVsyncDispatch(), workDuration,
                                                        readyDuration, traceVsync, name);
 }
 
@@ -210,7 +140,7 @@
         return true;
     }
 
-    return mVsyncSchedule.tracker->isVSyncInPhase(expectedVsyncTimestamp, *frameRate);
+    return mVsyncSchedule->getTracker().isVSyncInPhase(expectedVsyncTimestamp, *frameRate);
 }
 
 impl::EventThread::ThrottleVsyncCallback Scheduler::makeThrottleVsyncCallback() const {
@@ -245,7 +175,7 @@
     };
 }
 
-Scheduler::ConnectionHandle Scheduler::createConnection(
+ConnectionHandle Scheduler::createConnection(
         const char* connectionName, frametimeline::TokenManager* tokenManager,
         std::chrono::nanoseconds workDuration, std::chrono::nanoseconds readyDuration,
         impl::EventThread::InterceptVSyncsCallback interceptCallback) {
@@ -259,7 +189,7 @@
     return createConnection(std::move(eventThread));
 }
 
-Scheduler::ConnectionHandle Scheduler::createConnection(std::unique_ptr<EventThread> eventThread) {
+ConnectionHandle Scheduler::createConnection(std::unique_ptr<EventThread> eventThread) {
     const ConnectionHandle handle = ConnectionHandle{mNextConnectionHandleId++};
     ALOGV("Creating a connection handle with ID %" PRIuPTR, handle.id);
 
@@ -346,24 +276,24 @@
 
 void Scheduler::onPrimaryDisplayModeChanged(ConnectionHandle handle, DisplayModePtr mode) {
     {
-        std::lock_guard<std::mutex> lock(mFeatureStateLock);
+        std::lock_guard<std::mutex> lock(mPolicyLock);
         // Cache the last reported modes for primary display.
-        mFeatures.cachedModeChangedParams = {handle, mode};
+        mPolicy.cachedModeChangedParams = {handle, mode};
 
         // Invalidate content based refresh rate selection so it could be calculated
         // again for the new refresh rate.
-        mFeatures.contentRequirements.clear();
+        mPolicy.contentRequirements.clear();
     }
     onNonPrimaryDisplayModeChanged(handle, mode);
 }
 
 void Scheduler::dispatchCachedReportedMode() {
     // Check optional fields first.
-    if (!mFeatures.mode) {
+    if (!mPolicy.mode) {
         ALOGW("No mode ID found, not dispatching cached mode.");
         return;
     }
-    if (!mFeatures.cachedModeChangedParams.has_value()) {
+    if (!mPolicy.cachedModeChangedParams) {
         ALOGW("No mode changed params found, not dispatching cached mode.");
         return;
     }
@@ -372,18 +302,18 @@
     // mode change is in progress. In that case we shouldn't dispatch an event
     // as it will be dispatched when the current mode changes.
     if (std::scoped_lock lock(mRefreshRateConfigsLock);
-        mRefreshRateConfigs->getCurrentRefreshRate().getMode() != mFeatures.mode) {
+        mRefreshRateConfigs->getCurrentRefreshRate().getMode() != mPolicy.mode) {
         return;
     }
 
     // If there is no change from cached mode, there is no need to dispatch an event
-    if (mFeatures.mode == mFeatures.cachedModeChangedParams->mode) {
+    if (mPolicy.mode == mPolicy.cachedModeChangedParams->mode) {
         return;
     }
 
-    mFeatures.cachedModeChangedParams->mode = mFeatures.mode;
-    onNonPrimaryDisplayModeChanged(mFeatures.cachedModeChangedParams->handle,
-                                   mFeatures.cachedModeChangedParams->mode);
+    mPolicy.cachedModeChangedParams->mode = mPolicy.mode;
+    onNonPrimaryDisplayModeChanged(mPolicy.cachedModeChangedParams->handle,
+                                   mPolicy.cachedModeChangedParams->mode);
 }
 
 void Scheduler::onNonPrimaryDisplayModeChanged(ConnectionHandle handle, DisplayModePtr mode) {
@@ -424,12 +354,12 @@
 }
 
 DisplayStatInfo Scheduler::getDisplayStatInfo(nsecs_t now) {
-    const auto vsyncTime = mVsyncSchedule.tracker->nextAnticipatedVSyncTimeFrom(now);
-    const auto vsyncPeriod = mVsyncSchedule.tracker->currentPeriod();
+    const auto vsyncTime = mVsyncSchedule->getTracker().nextAnticipatedVSyncTimeFrom(now);
+    const auto vsyncPeriod = mVsyncSchedule->getTracker().currentPeriod();
     return DisplayStatInfo{.vsyncTime = vsyncTime, .vsyncPeriod = vsyncPeriod};
 }
 
-Scheduler::ConnectionHandle Scheduler::enableVSyncInjection(bool enable) {
+ConnectionHandle Scheduler::enableVSyncInjection(bool enable) {
     if (mInjectVSyncs == enable) {
         return {};
     }
@@ -470,7 +400,7 @@
 void Scheduler::enableHardwareVsync() {
     std::lock_guard<std::mutex> lock(mHWVsyncLock);
     if (!mPrimaryHWVsyncEnabled && mHWVsyncAvailable) {
-        mVsyncSchedule.tracker->resetModel();
+        mVsyncSchedule->getTracker().resetModel();
         mSchedulerCallback.setVsyncEnabled(true);
         mPrimaryHWVsyncEnabled = true;
     }
@@ -523,10 +453,10 @@
 
 void Scheduler::setVsyncPeriod(nsecs_t period) {
     std::lock_guard<std::mutex> lock(mHWVsyncLock);
-    mVsyncSchedule.controller->startPeriodTransition(period);
+    mVsyncSchedule->getController().startPeriodTransition(period);
 
     if (!mPrimaryHWVsyncEnabled) {
-        mVsyncSchedule.tracker->resetModel();
+        mVsyncSchedule->getTracker().resetModel();
         mSchedulerCallback.setVsyncEnabled(true);
         mPrimaryHWVsyncEnabled = true;
     }
@@ -539,8 +469,9 @@
     { // Scope for the lock
         std::lock_guard<std::mutex> lock(mHWVsyncLock);
         if (mPrimaryHWVsyncEnabled) {
-            needsHwVsync = mVsyncSchedule.controller->addHwVsyncTimestamp(timestamp, hwcVsyncPeriod,
-                                                                          periodFlushed);
+            needsHwVsync =
+                    mVsyncSchedule->getController().addHwVsyncTimestamp(timestamp, hwcVsyncPeriod,
+                                                                        periodFlushed);
         }
     }
 
@@ -551,24 +482,23 @@
     }
 }
 
-void Scheduler::addPresentFence(const std::shared_ptr<FenceTime>& fenceTime) {
-    if (mVsyncSchedule.controller->addPresentFence(fenceTime)) {
+void Scheduler::addPresentFence(std::shared_ptr<FenceTime> fence) {
+    if (mVsyncSchedule->getController().addPresentFence(std::move(fence))) {
         enableHardwareVsync();
     } else {
         disableHardwareVsync(false);
     }
 }
 
-void Scheduler::setIgnorePresentFences(bool ignore) {
-    mVsyncSchedule.controller->setIgnorePresentFences(ignore);
-}
-
 void Scheduler::registerLayer(Layer* layer) {
+    using WindowType = gui::WindowInfo::Type;
+
     scheduler::LayerHistory::LayerVoteType voteType;
 
-    if (!mOptions.useContentDetection || layer->getWindowType() == WindowInfo::Type::STATUS_BAR) {
+    if (!mFeatures.test(Feature::kContentDetection) ||
+        layer->getWindowType() == WindowType::STATUS_BAR) {
         voteType = scheduler::LayerHistory::LayerVoteType::NoVote;
-    } else if (layer->getWindowType() == WindowInfo::Type::WALLPAPER) {
+    } else if (layer->getWindowType() == WindowType::WALLPAPER) {
         // Running Wallpaper at Min is considered as part of content detection.
         voteType = scheduler::LayerHistory::LayerVoteType::Min;
     } else {
@@ -615,13 +545,13 @@
     bool frameRateChanged;
     bool frameRateOverridesChanged;
     {
-        std::lock_guard<std::mutex> lock(mFeatureStateLock);
-        mFeatures.contentRequirements = summary;
+        std::lock_guard<std::mutex> lock(mPolicyLock);
+        mPolicy.contentRequirements = summary;
 
         newMode = calculateRefreshRateModeId(&consideredSignals);
         frameRateOverridesChanged = updateFrameRateOverrides(consideredSignals, newMode->getFps());
 
-        if (mFeatures.mode == newMode) {
+        if (mPolicy.mode == newMode) {
             // We don't need to change the display mode, but we might need to send an event
             // about a mode change, since it was suppressed due to a previous idleConsidered
             if (!consideredSignals.idle) {
@@ -629,15 +559,16 @@
             }
             frameRateChanged = false;
         } else {
-            mFeatures.mode = newMode;
+            mPolicy.mode = newMode;
             frameRateChanged = true;
         }
     }
     if (frameRateChanged) {
-        auto newRefreshRate = refreshRateConfigs->getRefreshRateFromModeId(newMode->getId());
+        const auto newRefreshRate = refreshRateConfigs->getRefreshRateFromModeId(newMode->getId());
+
         mSchedulerCallback.changeRefreshRate(newRefreshRate,
-                                             consideredSignals.idle ? ModeEvent::None
-                                                                    : ModeEvent::Changed);
+                                             consideredSignals.idle ? DisplayModeEvent::None
+                                                                    : DisplayModeEvent::Changed);
     }
     if (frameRateOverridesChanged) {
         mSchedulerCallback.triggerOnFrameRateOverridesChanged();
@@ -660,8 +591,8 @@
 
 void Scheduler::setDisplayPowerState(bool normal) {
     {
-        std::lock_guard<std::mutex> lock(mFeatureStateLock);
-        mFeatures.isDisplayPowerStateNormal = normal;
+        std::lock_guard<std::mutex> lock(mPolicyLock);
+        mPolicy.isDisplayPowerStateNormal = normal;
     }
 
     if (mDisplayPowerTimer) {
@@ -703,7 +634,7 @@
 }
 
 void Scheduler::idleTimerCallback(TimerState state) {
-    handleTimerStateChanged(&mFeatures.idleTimer, state);
+    handleTimerStateChanged(&mPolicy.idleTimer, state);
     ATRACE_INT("ExpiredIdleTimer", static_cast<int>(state));
 }
 
@@ -713,14 +644,14 @@
     // Clear layer history to get fresh FPS detection.
     // NOTE: Instead of checking all the layers, we should be checking the layer
     // that is currently on top. b/142507166 will give us this capability.
-    if (handleTimerStateChanged(&mFeatures.touch, touch)) {
+    if (handleTimerStateChanged(&mPolicy.touch, touch)) {
         mLayerHistory.clear();
     }
     ATRACE_INT("TouchState", static_cast<int>(touch));
 }
 
 void Scheduler::displayPowerTimerCallback(TimerState state) {
-    handleTimerStateChanged(&mFeatures.displayPowerTimer, state);
+    handleTimerStateChanged(&mPolicy.displayPowerTimer, state);
     ATRACE_INT("ExpiredDisplayPowerTimer", static_cast<int>(state));
 }
 
@@ -730,7 +661,7 @@
     StringAppendF(&result, "+  Touch timer: %s\n",
                   mTouchTimer ? mTouchTimer->dump().c_str() : "off");
     StringAppendF(&result, "+  Content detection: %s %s\n\n",
-                  toContentDetectionString(mOptions.useContentDetection),
+                  mFeatures.test(Feature::kContentDetection) ? "on" : "off",
                   mLayerHistory.dump().c_str());
 
     {
@@ -756,13 +687,8 @@
     }
 }
 
-void Scheduler::dumpVsync(std::string& s) const {
-    using base::StringAppendF;
-
-    StringAppendF(&s, "VSyncReactor:\n");
-    mVsyncSchedule.controller->dump(s);
-    StringAppendF(&s, "VSyncDispatch:\n");
-    mVsyncSchedule.dispatch->dump(s);
+void Scheduler::dumpVsync(std::string& out) const {
+    mVsyncSchedule->dump(out);
 }
 
 bool Scheduler::updateFrameRateOverrides(
@@ -774,7 +700,7 @@
 
     if (!consideredSignals.idle) {
         const auto frameRateOverrides =
-                refreshRateConfigs->getFrameRateOverrides(mFeatures.contentRequirements,
+                refreshRateConfigs->getFrameRateOverrides(mPolicy.contentRequirements,
                                                           displayRefreshRate, consideredSignals);
         std::lock_guard lock(mFrameRateOverridesLock);
         if (!std::equal(mFrameRateOverridesByContent.begin(), mFrameRateOverridesByContent.end(),
@@ -797,31 +723,30 @@
     scheduler::RefreshRateConfigs::GlobalSignals consideredSignals;
     const auto refreshRateConfigs = holdRefreshRateConfigs();
     {
-        std::lock_guard<std::mutex> lock(mFeatureStateLock);
+        std::lock_guard<std::mutex> lock(mPolicyLock);
         if (*currentState == newState) {
             return false;
         }
         *currentState = newState;
         newMode = calculateRefreshRateModeId(&consideredSignals);
         frameRateOverridesChanged = updateFrameRateOverrides(consideredSignals, newMode->getFps());
-        if (mFeatures.mode == newMode) {
+        if (mPolicy.mode == newMode) {
             // We don't need to change the display mode, but we might need to send an event
             // about a mode change, since it was suppressed due to a previous idleConsidered
             if (!consideredSignals.idle) {
                 dispatchCachedReportedMode();
             }
         } else {
-            mFeatures.mode = newMode;
+            mPolicy.mode = newMode;
             refreshRateChanged = true;
         }
     }
     if (refreshRateChanged) {
-        const RefreshRate& newRefreshRate =
-                refreshRateConfigs->getRefreshRateFromModeId(newMode->getId());
+        const auto newRefreshRate = refreshRateConfigs->getRefreshRateFromModeId(newMode->getId());
 
         mSchedulerCallback.changeRefreshRate(newRefreshRate,
-                                             consideredSignals.idle ? ModeEvent::None
-                                                                    : ModeEvent::Changed);
+                                             consideredSignals.idle ? DisplayModeEvent::None
+                                                                    : DisplayModeEvent::Changed);
     }
     if (frameRateOverridesChanged) {
         mSchedulerCallback.triggerOnFrameRateOverridesChanged();
@@ -838,27 +763,26 @@
     // If Display Power is not in normal operation we want to be in performance mode. When coming
     // back to normal mode, a grace period is given with DisplayPowerTimer.
     if (mDisplayPowerTimer &&
-        (!mFeatures.isDisplayPowerStateNormal ||
-         mFeatures.displayPowerTimer == TimerState::Reset)) {
+        (!mPolicy.isDisplayPowerStateNormal || mPolicy.displayPowerTimer == TimerState::Reset)) {
         return refreshRateConfigs->getMaxRefreshRateByPolicy().getMode();
     }
 
-    const bool touchActive = mTouchTimer && mFeatures.touch == TouchState::Active;
-    const bool idle = mFeatures.idleTimer == TimerState::Expired;
+    const bool touchActive = mTouchTimer && mPolicy.touch == TouchState::Active;
+    const bool idle = mPolicy.idleTimer == TimerState::Expired;
 
     return refreshRateConfigs
-            ->getBestRefreshRate(mFeatures.contentRequirements,
-                                 {.touch = touchActive, .idle = idle}, consideredSignals)
+            ->getBestRefreshRate(mPolicy.contentRequirements, {.touch = touchActive, .idle = idle},
+                                 consideredSignals)
             .getMode();
 }
 
 DisplayModePtr Scheduler::getPreferredDisplayMode() {
-    std::lock_guard<std::mutex> lock(mFeatureStateLock);
+    std::lock_guard<std::mutex> lock(mPolicyLock);
     // Make sure that the default mode ID is first updated, before returned.
-    if (mFeatures.mode) {
-        mFeatures.mode = calculateRefreshRateModeId();
+    if (mPolicy.mode) {
+        mPolicy.mode = calculateRefreshRateModeId();
     }
-    return mFeatures.mode;
+    return mPolicy.mode;
 }
 
 void Scheduler::onNewVsyncPeriodChangeTimeline(const hal::VsyncPeriodChangeTimeline& timeline) {
@@ -915,8 +839,8 @@
 std::chrono::steady_clock::time_point Scheduler::getPreviousVsyncFrom(
         nsecs_t expectedPresentTime) const {
     const auto presentTime = std::chrono::nanoseconds(expectedPresentTime);
-    const auto vsyncPeriod = std::chrono::nanoseconds(mVsyncSchedule.tracker->currentPeriod());
+    const auto vsyncPeriod = std::chrono::nanoseconds(mVsyncSchedule->getTracker().currentPeriod());
     return std::chrono::steady_clock::time_point(presentTime - vsyncPeriod);
 }
 
-} // namespace android
+} // namespace android::scheduler
diff --git a/services/surfaceflinger/Scheduler/Scheduler.h b/services/surfaceflinger/Scheduler/Scheduler.h
index 2a6de54..e127ff7 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.h
+++ b/services/surfaceflinger/Scheduler/Scheduler.h
@@ -31,40 +31,37 @@
 #include <ui/GraphicTypes.h>
 #pragma clang diagnostic pop // ignored "-Wconversion -Wextra"
 
+#include <scheduler/Features.h>
+
 #include "EventThread.h"
 #include "LayerHistory.h"
 #include "MessageQueue.h"
 #include "OneShotTimer.h"
 #include "RefreshRateConfigs.h"
 #include "SchedulerUtils.h"
+#include "VsyncSchedule.h"
 
 namespace android {
 
-using namespace std::chrono_literals;
-using scheduler::LayerHistory;
-
 class FenceTime;
 class InjectVSyncSource;
-class PredictedVsyncTracer;
-
-namespace scheduler {
-class VsyncController;
-class VSyncDispatch;
-class VSyncTracker;
-} // namespace scheduler
 
 namespace frametimeline {
 class TokenManager;
 } // namespace frametimeline
 
+namespace scheduler {
+
 struct ISchedulerCallback {
     // Indicates frame activity, i.e. whether commit and/or composite is taking place.
     enum class FrameHint { kNone, kActive };
 
+    using RefreshRate = RefreshRateConfigs::RefreshRate;
+    using DisplayModeEvent = scheduler::DisplayModeEvent;
+
     virtual void scheduleComposite(FrameHint) = 0;
     virtual void setVsyncEnabled(bool) = 0;
-    virtual void changeRefreshRate(const scheduler::RefreshRateConfigs::RefreshRate&,
-                                   scheduler::RefreshRateConfigEvent) = 0;
+    virtual void changeRefreshRate(const RefreshRate&, DisplayModeEvent) = 0;
     virtual void kernelTimerChanged(bool expired) = 0;
     virtual void triggerOnFrameRateOverridesChanged() = 0;
 
@@ -76,18 +73,10 @@
     using Impl = impl::MessageQueue;
 
 public:
-    using RefreshRate = scheduler::RefreshRateConfigs::RefreshRate;
-    using ModeEvent = scheduler::RefreshRateConfigEvent;
-
-    struct Options {
-        // Whether to use content detection at all.
-        bool useContentDetection;
-    };
-
-    Scheduler(ICompositor&, ISchedulerCallback&, Options);
+    Scheduler(ICompositor&, ISchedulerCallback&, FeatureFlags);
     ~Scheduler();
 
-    void createVsyncSchedule(bool supportKernelIdleTimer);
+    void createVsyncSchedule(FeatureFlags);
     void startTimers();
     void run();
 
@@ -107,7 +96,6 @@
         return std::move(future);
     }
 
-    using ConnectionHandle = scheduler::ConnectionHandle;
     ConnectionHandle createConnection(const char* connectionName, frametimeline::TokenManager*,
                                       std::chrono::nanoseconds workDuration,
                                       std::chrono::nanoseconds readyDuration,
@@ -119,7 +107,7 @@
     sp<EventThreadConnection> getEventConnection(ConnectionHandle);
 
     void onHotplugReceived(ConnectionHandle, PhysicalDisplayId, bool connected);
-    void onPrimaryDisplayModeChanged(ConnectionHandle, DisplayModePtr) EXCLUDES(mFeatureStateLock);
+    void onPrimaryDisplayModeChanged(ConnectionHandle, DisplayModePtr) EXCLUDES(mPolicyLock);
     void onNonPrimaryDisplayModeChanged(ConnectionHandle, DisplayModePtr);
     void onScreenAcquired(ConnectionHandle);
     void onScreenReleased(ConnectionHandle);
@@ -152,8 +140,7 @@
     // VsyncController detected that the vsync period changed, and false otherwise.
     void addResyncSample(nsecs_t timestamp, std::optional<nsecs_t> hwcVsyncPeriod,
                          bool* periodFlushed);
-    void addPresentFence(const std::shared_ptr<FenceTime>&);
-    void setIgnorePresentFences(bool ignore);
+    void addPresentFence(std::shared_ptr<FenceTime>);
 
     // Layers are registered on creation, and unregistered when the weak reference expires.
     void registerLayer(Layer*);
@@ -172,7 +159,7 @@
 
     void setDisplayPowerState(bool normal);
 
-    scheduler::VSyncDispatch& getVsyncDispatch() { return *mVsyncSchedule.dispatch; }
+    VSyncDispatch& getVsyncDispatch() { return mVsyncSchedule->getDispatch(); }
 
     // Returns true if a given vsync timestamp is considered valid vsync
     // for a given uid
@@ -211,7 +198,7 @@
     std::optional<Fps> getFrameRateOverride(uid_t uid) const
             EXCLUDES(mRefreshRateConfigsLock, mFrameRateOverridesLock);
 
-    void setRefreshRateConfigs(std::shared_ptr<scheduler::RefreshRateConfigs> refreshRateConfigs)
+    void setRefreshRateConfigs(std::shared_ptr<RefreshRateConfigs> refreshRateConfigs)
             EXCLUDES(mRefreshRateConfigsLock) {
         // We need to stop the idle timer on the previous RefreshRateConfigs instance
         // and cleanup the scheduler's state before we switch to the other RefreshRateConfigs.
@@ -220,8 +207,8 @@
             if (mRefreshRateConfigs) mRefreshRateConfigs->stopIdleTimer();
         }
         {
-            std::scoped_lock lock(mFeatureStateLock);
-            mFeatures = {};
+            std::scoped_lock lock(mPolicyLock);
+            mPolicy = {};
         }
         {
             std::scoped_lock lock(mRefreshRateConfigsLock);
@@ -251,18 +238,10 @@
 
     using FrameHint = ISchedulerCallback::FrameHint;
 
-    // In order to make sure that the features don't override themselves, we need a state machine
-    // to keep track which feature requested the config change.
     enum class ContentDetectionState { Off, On };
     enum class TimerState { Reset, Expired };
     enum class TouchState { Inactive, Active };
 
-    struct VsyncSchedule {
-        std::unique_ptr<scheduler::VsyncController> controller;
-        std::unique_ptr<scheduler::VSyncTracker> tracker;
-        std::unique_ptr<scheduler::VSyncDispatch> dispatch;
-    };
-
     // Create a connection on the given EventThread.
     ConnectionHandle createConnection(std::unique_ptr<EventThread>);
     sp<EventThreadConnection> createConnectionInternal(
@@ -284,19 +263,17 @@
     // selection were initialized, prioritizes them, and calculates the DisplayModeId
     // for the suggested refresh rate.
     DisplayModePtr calculateRefreshRateModeId(
-            scheduler::RefreshRateConfigs::GlobalSignals* consideredSignals = nullptr)
-            REQUIRES(mFeatureStateLock);
+            RefreshRateConfigs::GlobalSignals* consideredSignals = nullptr) REQUIRES(mPolicyLock);
 
-    void dispatchCachedReportedMode() REQUIRES(mFeatureStateLock) EXCLUDES(mRefreshRateConfigsLock);
-    bool updateFrameRateOverrides(scheduler::RefreshRateConfigs::GlobalSignals consideredSignals,
-                                  Fps displayRefreshRate) REQUIRES(mFeatureStateLock)
-            EXCLUDES(mFrameRateOverridesLock);
+    void dispatchCachedReportedMode() REQUIRES(mPolicyLock) EXCLUDES(mRefreshRateConfigsLock);
+    bool updateFrameRateOverrides(RefreshRateConfigs::GlobalSignals, Fps displayRefreshRate)
+            REQUIRES(mPolicyLock) EXCLUDES(mFrameRateOverridesLock);
 
     impl::EventThread::ThrottleVsyncCallback makeThrottleVsyncCallback() const
             EXCLUDES(mRefreshRateConfigsLock);
     impl::EventThread::GetVsyncPeriodFunction makeGetVsyncPeriodFunction() const;
 
-    std::shared_ptr<scheduler::RefreshRateConfigs> holdRefreshRateConfigs() const
+    std::shared_ptr<RefreshRateConfigs> holdRefreshRateConfigs() const
             EXCLUDES(mRefreshRateConfigsLock) {
         std::scoped_lock lock(mRefreshRateConfigsLock);
         return mRefreshRateConfigs;
@@ -322,66 +299,63 @@
 
     std::atomic<nsecs_t> mLastResyncTime = 0;
 
-    const Options mOptions;
-    VsyncSchedule mVsyncSchedule;
+    const FeatureFlags mFeatures;
+    std::optional<VsyncSchedule> mVsyncSchedule;
 
     // Used to choose refresh rate if content detection is enabled.
     LayerHistory mLayerHistory;
 
     // Timer used to monitor touch events.
-    std::optional<scheduler::OneShotTimer> mTouchTimer;
+    std::optional<OneShotTimer> mTouchTimer;
     // Timer used to monitor display power mode.
-    std::optional<scheduler::OneShotTimer> mDisplayPowerTimer;
+    std::optional<OneShotTimer> mDisplayPowerTimer;
 
     ISchedulerCallback& mSchedulerCallback;
 
-    // In order to make sure that the features don't override themselves, we need a state machine
-    // to keep track which feature requested the config change.
-    mutable std::mutex mFeatureStateLock;
+    mutable std::mutex mPolicyLock;
 
     struct {
+        // Policy for choosing the display mode.
+        LayerHistory::Summary contentRequirements;
         TimerState idleTimer = TimerState::Reset;
         TouchState touch = TouchState::Inactive;
         TimerState displayPowerTimer = TimerState::Expired;
-
-        DisplayModePtr mode;
-        LayerHistory::Summary contentRequirements;
-
         bool isDisplayPowerStateNormal = true;
 
-        // Used to cache the last parameters of onPrimaryDisplayModeChanged
+        // Chosen display mode.
+        DisplayModePtr mode;
+
         struct ModeChangedParams {
             ConnectionHandle handle;
             DisplayModePtr mode;
         };
 
+        // Parameters for latest dispatch of mode change event.
         std::optional<ModeChangedParams> cachedModeChangedParams;
-    } mFeatures GUARDED_BY(mFeatureStateLock);
+    } mPolicy GUARDED_BY(mPolicyLock);
 
     mutable std::mutex mRefreshRateConfigsLock;
-    std::shared_ptr<scheduler::RefreshRateConfigs> mRefreshRateConfigs
-            GUARDED_BY(mRefreshRateConfigsLock);
+    std::shared_ptr<RefreshRateConfigs> mRefreshRateConfigs GUARDED_BY(mRefreshRateConfigsLock);
 
     std::mutex mVsyncTimelineLock;
     std::optional<hal::VsyncPeriodChangeTimeline> mLastVsyncPeriodChangeTimeline
             GUARDED_BY(mVsyncTimelineLock);
     static constexpr std::chrono::nanoseconds MAX_VSYNC_APPLIED_TIME = 200ms;
 
-    std::unique_ptr<PredictedVsyncTracer> mPredictedVsyncTracer;
-
     // The frame rate override lists need their own mutex as they are being read
     // by SurfaceFlinger, Scheduler and EventThread (as a callback) to prevent deadlocks
     mutable std::mutex mFrameRateOverridesLock;
 
     // mappings between a UID and a preferred refresh rate that this app would
     // run at.
-    scheduler::RefreshRateConfigs::UidToFrameRateOverride mFrameRateOverridesByContent
+    RefreshRateConfigs::UidToFrameRateOverride mFrameRateOverridesByContent
             GUARDED_BY(mFrameRateOverridesLock);
-    scheduler::RefreshRateConfigs::UidToFrameRateOverride mFrameRateOverridesFromBackdoor
+    RefreshRateConfigs::UidToFrameRateOverride mFrameRateOverridesFromBackdoor
             GUARDED_BY(mFrameRateOverridesLock);
 
     // Keeps track of whether the screen is acquired for debug
     std::atomic<bool> mScreenAcquired = false;
 };
 
+} // namespace scheduler
 } // namespace android
diff --git a/services/surfaceflinger/Scheduler/VSyncReactor.cpp b/services/surfaceflinger/Scheduler/VSyncReactor.cpp
index ee973f7..1c9de1c 100644
--- a/services/surfaceflinger/Scheduler/VSyncReactor.cpp
+++ b/services/surfaceflinger/Scheduler/VSyncReactor.cpp
@@ -47,7 +47,7 @@
 
 VSyncReactor::~VSyncReactor() = default;
 
-bool VSyncReactor::addPresentFence(const std::shared_ptr<android::FenceTime>& fence) {
+bool VSyncReactor::addPresentFence(std::shared_ptr<FenceTime> fence) {
     if (!fence) {
         return false;
     }
@@ -80,7 +80,7 @@
         if (mPendingLimit == mUnfiredFences.size()) {
             mUnfiredFences.erase(mUnfiredFences.begin());
         }
-        mUnfiredFences.push_back(fence);
+        mUnfiredFences.push_back(std::move(fence));
     } else {
         timestampAccepted &= mTracker.addVsyncTimestamp(signalTime);
     }
diff --git a/services/surfaceflinger/Scheduler/VSyncReactor.h b/services/surfaceflinger/Scheduler/VSyncReactor.h
index 449d4c3..a9d536b 100644
--- a/services/surfaceflinger/Scheduler/VSyncReactor.h
+++ b/services/surfaceflinger/Scheduler/VSyncReactor.h
@@ -37,7 +37,7 @@
                  bool supportKernelIdleTimer);
     ~VSyncReactor();
 
-    bool addPresentFence(const std::shared_ptr<android::FenceTime>& fence) final;
+    bool addPresentFence(std::shared_ptr<FenceTime>) final;
     void setIgnorePresentFences(bool ignore) final;
 
     void startPeriodTransition(nsecs_t period) final;
diff --git a/services/surfaceflinger/Scheduler/VsyncController.h b/services/surfaceflinger/Scheduler/VsyncController.h
index 0f0df22..59f6537 100644
--- a/services/surfaceflinger/Scheduler/VsyncController.h
+++ b/services/surfaceflinger/Scheduler/VsyncController.h
@@ -17,19 +17,15 @@
 #pragma once
 
 #include <cstddef>
+#include <memory>
 
+#include <ui/FenceTime.h>
 #include <utils/Mutex.h>
 #include <utils/RefBase.h>
 #include <utils/Timers.h>
 
-#include <ui/FenceTime.h>
-
-#include <memory>
-
 namespace android::scheduler {
 
-class FenceTime;
-
 class VsyncController {
 public:
     virtual ~VsyncController();
@@ -43,7 +39,7 @@
      *                      an accurate prediction,
      *                      False otherwise
      */
-    virtual bool addPresentFence(const std::shared_ptr<android::FenceTime>&) = 0;
+    virtual bool addPresentFence(std::shared_ptr<FenceTime>) = 0;
 
     /*
      * Adds a hw sync timestamp to the model. The controller will use the timestamp
diff --git a/services/surfaceflinger/Scheduler/VsyncSchedule.cpp b/services/surfaceflinger/Scheduler/VsyncSchedule.cpp
new file mode 100644
index 0000000..77d1223
--- /dev/null
+++ b/services/surfaceflinger/Scheduler/VsyncSchedule.cpp
@@ -0,0 +1,113 @@
+/*
+ * 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.
+ */
+
+#include <scheduler/Fps.h>
+
+#include "VsyncSchedule.h"
+
+#include "Timer.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
diff --git a/services/surfaceflinger/Scheduler/VsyncSchedule.h b/services/surfaceflinger/Scheduler/VsyncSchedule.h
new file mode 100644
index 0000000..0d9b114
--- /dev/null
+++ b/services/surfaceflinger/Scheduler/VsyncSchedule.h
@@ -0,0 +1,75 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <memory>
+#include <string>
+
+#include <scheduler/Features.h>
+
+namespace android::scheduler {
+
+// TODO(b/185535769): Rename classes, and remove aliases.
+class VSyncDispatch;
+class VSyncTracker;
+
+class VsyncController;
+using VsyncDispatch = VSyncDispatch;
+using VsyncTracker = VSyncTracker;
+
+// Schedule that synchronizes to hardware VSYNC of a physical display.
+class VsyncSchedule {
+public:
+    explicit VsyncSchedule(FeatureFlags);
+    VsyncSchedule(VsyncSchedule&&);
+    ~VsyncSchedule();
+
+    // TODO(b/185535769): Hide behind API.
+    const VsyncTracker& getTracker() const { return *mTracker; }
+    VsyncTracker& getTracker() { return *mTracker; }
+    VsyncController& getController() { return *mController; }
+
+    // TODO(b/185535769): Remove once VsyncSchedule owns all registrations.
+    VsyncDispatch& getDispatch() { return *mDispatch; }
+
+    void dump(std::string&) const;
+
+private:
+    friend class TestableScheduler;
+
+    using TrackerPtr = std::unique_ptr<VsyncTracker>;
+    using DispatchPtr = std::unique_ptr<VsyncDispatch>;
+    using ControllerPtr = std::unique_ptr<VsyncController>;
+
+    // For tests.
+    VsyncSchedule(TrackerPtr, DispatchPtr, ControllerPtr);
+
+    static TrackerPtr createTracker();
+    static DispatchPtr createDispatch(VsyncTracker&);
+    static ControllerPtr createController(VsyncTracker&, FeatureFlags);
+
+    class PredictedVsyncTracer;
+    using TracerPtr = std::unique_ptr<PredictedVsyncTracer>;
+
+    // Effectively const except in move constructor.
+    TrackerPtr mTracker;
+    DispatchPtr mDispatch;
+    ControllerPtr mController;
+    TracerPtr mTracer;
+};
+
+} // namespace android::scheduler
diff --git a/services/surfaceflinger/Scheduler/include/scheduler/Features.h b/services/surfaceflinger/Scheduler/include/scheduler/Features.h
new file mode 100644
index 0000000..0e96678
--- /dev/null
+++ b/services/surfaceflinger/Scheduler/include/scheduler/Features.h
@@ -0,0 +1,34 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <ftl/Flags.h>
+
+#include <cstdint>
+
+namespace android::scheduler {
+
+enum class Feature : std::uint8_t {
+    kPresentFences = 0b1,
+    kKernelIdleTimer = 0b10,
+    kContentDetection = 0b100,
+    kTracePredictedVsync = 0b1000,
+};
+
+using FeatureFlags = Flags<Feature>;
+
+} // namespace android::scheduler