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https://github.com/skyline-emu/skyline.git
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Keep track of how often textures/buffers are locked on the CPU
For the upcoming preserve attachment optimisation, which will keep buffers/textures locked on the GPU between executions, we don't want to preserve any which are frequently locked on the CPU as that would result in lots of needless waiting for a resource to be unlocked by the GPU when it occasionally frees all preserve attachments when it could have been done much sooner. By checking if a resource has ever been locked on the CPU and using that to choose whether we preserve it we can avoid such waiting.
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@ -331,6 +331,7 @@ namespace skyline::gpu {
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void Buffer::lock() {
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mutex.lock();
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accumulatedCpuLockCounter++;
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}
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bool Buffer::LockWithTag(ContextTag pTag) {
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@ -349,7 +350,11 @@ namespace skyline::gpu {
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}
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bool Buffer::try_lock() {
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return mutex.try_lock();
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if (mutex.try_lock()) {
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accumulatedCpuLockCounter++;
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return true;
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}
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return false;
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}
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BufferDelegate::BufferDelegate(Buffer *buffer) : buffer{buffer} {}
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@ -89,6 +89,9 @@ namespace skyline::gpu {
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int megaBufferTableShift; //!< Shift to apply to buffer offsets to get their megabuffer table index
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std::vector<MegaBufferTableEntry> megaBufferTable; //!< Table of megabuffer allocations for regions of the buffer
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static constexpr size_t FrequentlyLockedThreshold{2}; //!< Threshold for the number of times a buffer can be locked (not from context locks, only normal) before it should be considered frequently locked
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size_t accumulatedCpuLockCounter{}; //!< Number of times buffer has been locked through non-ContextLocks
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private:
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BufferDelegate *delegate;
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@ -214,6 +217,13 @@ namespace skyline::gpu {
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return SequencedCpuBackingWritesBlocked();
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}
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/**
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* @return If the buffer is frequently locked by threads using non-ContextLocks
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*/
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bool FrequentlyLocked() {
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return accumulatedCpuLockCounter >= FrequentlyLockedThreshold;
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}
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/**
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* @brief Waits on a fence cycle if it exists till it's signalled and resets it after
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* @note The buffer **must** be locked prior to calling this
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@ -614,6 +614,7 @@ namespace skyline::gpu {
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void Texture::lock() {
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mutex.lock();
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accumulatedCpuLockCounter++;
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}
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bool Texture::LockWithTag(ContextTag pTag) {
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@ -631,7 +632,12 @@ namespace skyline::gpu {
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}
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bool Texture::try_lock() {
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return mutex.try_lock();
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if (mutex.try_lock()) {
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accumulatedCpuLockCounter++;
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return true;
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}
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return false;
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}
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bool Texture::WaitOnBacking() {
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@ -423,6 +423,9 @@ namespace skyline::gpu {
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*/
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boost::container::small_vector<vk::BufferImageCopy, 10> GetBufferImageCopies();
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static constexpr size_t FrequentlyLockedThreshold{2}; //!< Threshold for the number of times a texture can be locked (not from context locks, only normal) before it should be considered frequently locked
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size_t accumulatedCpuLockCounter{};
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public:
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std::shared_ptr<FenceCycle> cycle; //!< A fence cycle for when any host operation mutating the texture has completed, it must be waited on prior to any mutations to the backing
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std::optional<GuestTexture> guest;
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@ -555,5 +558,12 @@ namespace skyline::gpu {
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.levelCount = VK_REMAINING_MIP_LEVELS,
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.layerCount = VK_REMAINING_ARRAY_LAYERS,
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});
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/**
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* @return If the texture is frequently locked by threads using non-ContextLocks
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*/
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bool FrequentlyLocked() {
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return accumulatedCpuLockCounter >= FrequentlyLockedThreshold;
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}
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};
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}
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