[vk] KeepAliveTick in Scheduler

src/video_core/renderer_vulkan/vk_pipeline_cache.cpp

@@ -715,6 +715,7 @@ GraphicsPipeline* PipelineCache::BuiltPipeline(GraphicsPipeline* pipeline) const
     if (draw_state.index_buffer.count <= 6 || draw_state.vertex_buffer.count <= 6) {
         return pipeline;
     }
+    scheduler.KeepAliveTick();
     return nullptr;
 }
 

src/video_core/renderer_vulkan/vk_scheduler.cpp

@@ -4,6 +4,7 @@
 // SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <chrono>
 #include <memory>
 #include <mutex>
 #include <thread>
@@ -78,6 +79,14 @@ void Scheduler::WaitWorker() {
     std::scoped_lock el{execution_mutex};
 }
 
+void Scheduler::KeepAliveTick() {
+    const auto now = Clock::now();
+    if (now - last_submission_time < KEEPALIVE_INTERVAL) {
+        return;
+    }
+    Flush();
+}
+
 void Scheduler::DispatchWork() {
     if (chunk->Empty()) {
         return;
@@ -271,6 +280,7 @@ u64 Scheduler::SubmitExecution(VkSemaphore signal_semaphore, VkSemaphore wait_se
     });
     chunk->MarkSubmit();
     DispatchWork();
+    last_submission_time = Clock::now();
     return signal_value;
 }
 

src/video_core/renderer_vulkan/vk_scheduler.h

@@ -6,6 +6,7 @@
 
 #pragma once
 
+#include <chrono>
 #include <condition_variable>
 #include <cstddef>
 #include <functional>
@@ -52,6 +53,9 @@ public:
     /// safe to touch worker resources.
     void WaitWorker();
 
+    /// Submits a tiny chunk of work if recent GPU submissions are stale.
+    void KeepAliveTick();
+
     /// Sends currently recorded work to the worker thread.
     void DispatchWork();
 
@@ -128,6 +132,8 @@ public:
     std::mutex submit_mutex;
 
 private:
+    using Clock = std::chrono::steady_clock;
+
     class Command {
     public:
         virtual ~Command() = default;
@@ -250,6 +256,9 @@ private:
 
     State state;
 
+    Clock::time_point last_submission_time{Clock::time_point::min()};
+    static constexpr std::chrono::milliseconds KEEPALIVE_INTERVAL{4};
+
     u32 num_renderpass_images = 0;
     std::array<VkImage, 9> renderpass_images{};
     std::array<VkImageSubresourceRange, 9> renderpass_image_ranges{};