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Commit ae2e3c74 authored by Ady Abraham's avatar Ady Abraham
Browse files

SF: fix refresh rate scoring when frameRateMultipleThreshold is used 

We can't exclude layers that are below the frameRateMultipleThreshold
when scoring the higher refresh rates (the ones above the threshold)
as it creates gives the lower refresh rates a higher score (as there are
more layers that are allowed to score them). Instead we use a different
approach which first scores the refresh rates based on all the layers
but the fixed source ones, and then we add the fixed source ones for the
refresh rates below the thresholds and for the above ones only when other
layers already scored them.

Bug: 242283390
Test: newly added unit tests scenarios
Change-Id: Ibe30ddd306265507ceedff6a6a725dadadc50af2
parent a62797e4

services/surfaceflinger/Scheduler/RefreshRateConfigs.cpp

+95 −46
Original line number Diff line number Diff line
@@ -40,22 +40,26 @@ namespace { 


struct RefreshRateScore {

    DisplayModeIterator modeIt;

    float score;

    float overallScore;

    struct {

        float belowThreshold;

        float aboveThreshold;

    } fixedRateLayersScore;

};



template <typename Iterator>

const DisplayModePtr& getMaxScoreRefreshRate(Iterator begin, Iterator end) {

    const auto it =

            std::max_element(begin, end, [](RefreshRateScore max, RefreshRateScore current) {

                const auto& [modeIt, score] = current;

                const auto& [modeIt, overallScore, _] = current;



                std::string name = to_string(modeIt->second->getFps());

                ALOGV("%s scores %.2f", name.c_str(), score);

                ALOGV("%s scores %.2f", name.c_str(), overallScore);



                ATRACE_INT(name.c_str(), static_cast<int>(std::round(score * 100)));

                ATRACE_INT(name.c_str(), static_cast<int>(std::round(overallScore * 100)));



                constexpr float kEpsilon = 0.0001f;

                return score > max.score * (1 + kEpsilon);

                return overallScore > max.overallScore * (1 + kEpsilon);

            });



    return it->modeIt->second;
@@ -151,31 +155,6 @@ std::pair<nsecs_t, nsecs_t> RefreshRateConfigs::getDisplayFrames(nsecs_t layerPe 
    return {quotient, remainder};

}



bool RefreshRateConfigs::isVoteAllowed(const LayerRequirement& layer, Fps refreshRate) const {

    using namespace fps_approx_ops;



    switch (layer.vote) {

        case LayerVoteType::ExplicitExactOrMultiple:

        case LayerVoteType::Heuristic:

            if (mConfig.frameRateMultipleThreshold != 0 &&

                refreshRate >= Fps::fromValue(mConfig.frameRateMultipleThreshold) &&

                layer.desiredRefreshRate < Fps::fromValue(mConfig.frameRateMultipleThreshold / 2)) {

                // Don't vote high refresh rates past the threshold for layers with a low desired

                // refresh rate. For example, desired 24 fps with 120 Hz threshold means no vote for

                // 120 Hz, but desired 60 fps should have a vote.

                return false;

            }

            break;

        case LayerVoteType::ExplicitDefault:

        case LayerVoteType::ExplicitExact:

        case LayerVoteType::Max:

        case LayerVoteType::Min:

        case LayerVoteType::NoVote:

            break;

    }

    return true;

}



float RefreshRateConfigs::calculateNonExactMatchingLayerScoreLocked(const LayerRequirement& layer,

                                                                    Fps refreshRate) const {

    constexpr float kScoreForFractionalPairs = .8f;
@@ -240,10 +219,6 @@ float RefreshRateConfigs::calculateNonExactMatchingLayerScoreLocked(const LayerR 


float RefreshRateConfigs::calculateLayerScoreLocked(const LayerRequirement& layer, Fps refreshRate,

                                                    bool isSeamlessSwitch) const {

    if (!isVoteAllowed(layer, refreshRate)) {

        return 0;

    }



    // Slightly prefer seamless switches.

    constexpr float kSeamedSwitchPenalty = 0.95f;

    const float seamlessness = isSeamlessSwitch ? 1.0f : kSeamedSwitchPenalty;
@@ -300,6 +275,7 @@ auto RefreshRateConfigs::getBestRefreshRate(const std::vector<LayerRequirement>& 
auto RefreshRateConfigs::getBestRefreshRateLocked(const std::vector<LayerRequirement>& layers,

                                                  GlobalSignals signals) const

        -> std::pair<DisplayModePtr, GlobalSignals> {

    using namespace fps_approx_ops;

    ATRACE_CALL();

    ALOGV("%s: %zu layers", __func__, layers.size());
@@ -409,7 +385,7 @@ auto RefreshRateConfigs::getBestRefreshRateLocked(const std::vector<LayerRequire 


        const auto weight = layer.weight;



        for (auto& [modeIt, score] : scores) {

        for (auto& [modeIt, overallScore, fixedRateScore] : scores) {

            const auto& [id, mode] = *modeIt;

            const bool isSeamlessSwitch = mode->getGroup() == mActiveModeIt->second->getGroup();
@@ -451,18 +427,91 @@ auto RefreshRateConfigs::getBestRefreshRateLocked(const std::vector<LayerRequire 
                continue;

            }



            const auto layerScore =

            const float layerScore =

                    calculateLayerScoreLocked(layer, mode->getFps(), isSeamlessSwitch);

            const float weightedLayerScore = weight * layerScore;



            // Layer with fixed source has a special consideration depends on the

            // mConfig.frameRateMultipleThreshold. We don't want these layers to score

            // refresh rates above the threshold, but we also don't want to favor the lower

            // ones by having a greater number of layers scoring them. Instead, we calculate

            // the score independently for these layers and later decide which

            // refresh rates to add it. For example, desired 24 fps with 120 Hz threshold should not

            // score 120 Hz, but desired 60 fps should contribute to the score.

            const bool fixedSourceLayer = [](LayerVoteType vote) {

                switch (vote) {

                    case LayerVoteType::ExplicitExactOrMultiple:

                    case LayerVoteType::Heuristic:

                        return true;

                    case LayerVoteType::NoVote:

                    case LayerVoteType::Min:

                    case LayerVoteType::Max:

                    case LayerVoteType::ExplicitDefault:

                    case LayerVoteType::ExplicitExact:

                        return false;

                }

            }(layer.vote);

            const bool layerAboveThreshold = mConfig.frameRateMultipleThreshold != 0 &&

                    mode->getFps() >= Fps::fromValue(mConfig.frameRateMultipleThreshold) &&

                    layer.desiredRefreshRate <

                            Fps::fromValue(mConfig.frameRateMultipleThreshold / 2);

            if (fixedSourceLayer) {

                if (layerAboveThreshold) {

                    ALOGV("%s gives %s fixed source (above threshold) score of %.4f",

                          formatLayerInfo(layer, weight).c_str(), to_string(mode->getFps()).c_str(),

                          layerScore);

                    fixedRateScore.aboveThreshold += weightedLayerScore;

                } else {

                    ALOGV("%s gives %s fixed source (below threshold) score of %.4f",

                          formatLayerInfo(layer, weight).c_str(), to_string(mode->getFps()).c_str(),

                          layerScore);

                    fixedRateScore.belowThreshold += weightedLayerScore;

                }

            } else {

                ALOGV("%s gives %s score of %.4f", formatLayerInfo(layer, weight).c_str(),

                      to_string(mode->getFps()).c_str(), layerScore);

                overallScore += weightedLayerScore;

            }

        }

    }



            score += weight * layerScore;

    // We want to find the best refresh rate without the fixed source layers,

    // so we could know whether we should add the aboveThreshold scores or not.

    // If the best refresh rate is already above the threshold, it means that

    // some non-fixed source layers already scored it, so we can just add the score

    // for all fixed source layers, even the ones that are above the threshold.

    const bool maxScoreAboveThreshold = [&] {

        if (mConfig.frameRateMultipleThreshold == 0 || scores.empty()) {

            return false;

        }



        const auto maxScoreIt =

                std::max_element(scores.begin(), scores.end(),

                                 [](RefreshRateScore max, RefreshRateScore current) {

                                     const auto& [modeIt, overallScore, _] = current;

                                     return overallScore > max.overallScore;

                                 });

        ALOGV("%s is the best refresh rate without fixed source layers. It is %s the threshold for "

              "refresh rate multiples",

              to_string(maxScoreIt->modeIt->second->getFps()).c_str(),

              maxScoreAboveThreshold ? "above" : "below");

        return maxScoreIt->modeIt->second->getFps() >=

                Fps::fromValue(mConfig.frameRateMultipleThreshold);

    }();



    // Now we can add the fixed rate layers score

    for (auto& [modeIt, overallScore, fixedRateScore] : scores) {

        overallScore += fixedRateScore.belowThreshold;

        if (maxScoreAboveThreshold) {

            overallScore += fixedRateScore.aboveThreshold;

        }

        ALOGV("%s adjusted overallScore is %.4f", to_string(modeIt->second->getFps()).c_str(),

              overallScore);

    }



    // Now that we scored all the refresh rates we need to pick the one that got the highest score.

    // In case of a tie we will pick the higher refresh rate if any of the layers wanted Max,

    // or the lower otherwise.

    // Now that we scored all the refresh rates we need to pick the one that got the highest

    // overallScore. In case of a tie we will pick the higher refresh rate if any of the layers

    // wanted Max, or the lower otherwise.

    const DisplayModePtr& bestRefreshRate = maxVoteLayers > 0

            ? getMaxScoreRefreshRate(scores.rbegin(), scores.rend())

            : getMaxScoreRefreshRate(scores.begin(), scores.end());
@@ -471,7 +520,7 @@ auto RefreshRateConfigs::getBestRefreshRateLocked(const std::vector<LayerRequire 
        // If we never scored any layers, then choose the rate from the primary

        // range instead of picking a random score from the app range.

        if (std::all_of(scores.begin(), scores.end(),

                        [](RefreshRateScore score) { return score.score == 0; })) {

                        [](RefreshRateScore score) { return score.overallScore == 0; })) {

            const DisplayModePtr& max = getMaxRefreshRateByPolicyLocked(anchorGroup);

            ALOGV("layers not scored - choose %s", to_string(max->getFps()).c_str());

            return {max, kNoSignals};
@@ -575,7 +624,7 @@ RefreshRateConfigs::UidToFrameRateOverride RefreshRateConfigs::getFrameRateOverr 
            continue;

        }



        for (auto& [_, score] : scores) {

        for (auto& [_, score, _1] : scores) {

            score = 0;

        }
@@ -587,7 +636,7 @@ RefreshRateConfigs::UidToFrameRateOverride RefreshRateConfigs::getFrameRateOverr 
            LOG_ALWAYS_FATAL_IF(layer->vote != LayerVoteType::ExplicitDefault &&

                                layer->vote != LayerVoteType::ExplicitExactOrMultiple &&

                                layer->vote != LayerVoteType::ExplicitExact);

            for (auto& [modeIt, score] : scores) {

            for (auto& [modeIt, score, _] : scores) {

                constexpr bool isSeamlessSwitch = true;

                const auto layerScore = calculateLayerScoreLocked(*layer, modeIt->second->getFps(),

                                                                  isSeamlessSwitch);
@@ -605,7 +654,7 @@ RefreshRateConfigs::UidToFrameRateOverride RefreshRateConfigs::getFrameRateOverr 


        // If we never scored any layers, we don't have a preferred frame rate

        if (std::all_of(scores.begin(), scores.end(),

                        [](RefreshRateScore score) { return score.score == 0; })) {

                        [](RefreshRateScore score) { return score.overallScore == 0; })) {

            continue;

        }

services/surfaceflinger/Scheduler/RefreshRateConfigs.h

+0 −3
Original line number Diff line number Diff line
@@ -353,9 +353,6 @@ private: 
    const Policy* getCurrentPolicyLocked() const REQUIRES(mLock);

    bool isPolicyValidLocked(const Policy& policy) const REQUIRES(mLock);



    // Returns whether the layer is allowed to vote for the given refresh rate.

    bool isVoteAllowed(const LayerRequirement&, Fps) const;



    // calculates a score for a layer. Used to determine the display refresh rate

    // and the frame rate override for certains applications.

    float calculateLayerScoreLocked(const LayerRequirement&, Fps refreshRate,

services/surfaceflinger/tests/unittests/RefreshRateConfigsTest.cpp

+23 −0
Original line number Diff line number Diff line
@@ -639,6 +639,29 @@ TEST_F(RefreshRateConfigsTest, getBestRefreshRate_30_60_90_120_DifferentTypes_mu 
    lr2.vote = LayerVoteType::ExplicitExactOrMultiple;

    lr2.name = "90Hz ExplicitExactOrMultiple";

    EXPECT_EQ(kMode90, configs.getBestRefreshRate(layers));



    lr1.desiredRefreshRate = 24_Hz;

    lr1.vote = LayerVoteType::ExplicitExactOrMultiple;

    lr1.name = "24Hz ExplicitExactOrMultiple";

    lr2.vote = LayerVoteType::Max;

    lr2.name = "Max";

    EXPECT_EQ(kMode120, configs.getBestRefreshRate(layers));



    lr1.desiredRefreshRate = 24_Hz;

    lr1.vote = LayerVoteType::ExplicitExactOrMultiple;

    lr1.name = "24Hz ExplicitExactOrMultiple";

    lr2.desiredRefreshRate = 120_Hz;

    lr2.vote = LayerVoteType::ExplicitDefault;

    lr2.name = "120Hz ExplicitDefault";

    EXPECT_EQ(kMode120, configs.getBestRefreshRate(layers));



    lr1.desiredRefreshRate = 24_Hz;

    lr1.vote = LayerVoteType::ExplicitExactOrMultiple;

    lr1.name = "24Hz ExplicitExactOrMultiple";

    lr2.desiredRefreshRate = 120_Hz;

    lr2.vote = LayerVoteType::ExplicitExact;

    lr2.name = "120Hz ExplicitExact";

    EXPECT_EQ(kMode120, configs.getBestRefreshRate(layers));

}



TEST_F(RefreshRateConfigsTest, getBestRefreshRate_30_60) {