From 8c24a40bfa9dc079ce496771322a5143e761ce66 Mon Sep 17 00:00:00 2001
From: ParantezTech <12572227+par274@users.noreply.github.com>
Date: Sun, 11 Oct 2026 01:40:50 +0300
Subject: [PATCH] [HLE] Skip the region lock for writes to CPU-dirty pages

---
 src/SharpEmu.HLE/GpuMemory/GuestPageTracker.cs |  8 ++++++++
 src/SharpEmu.HLE/GpuMemory/TrackedRegion.cs    | 14 ++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/SharpEmu.HLE/GpuMemory/GuestPageTracker.cs b/src/SharpEmu.HLE/GpuMemory/GuestPageTracker.cs
index 0ac893a..2032867 100644
--- a/src/SharpEmu.HLE/GpuMemory/GuestPageTracker.cs
+++ b/src/SharpEmu.HLE/GpuMemory/GuestPageTracker.cs
@@ -198,6 +198,14 @@ public sealed class GuestPageTracker
             if (Volatile.Read(ref _regions[index]) is { } region)
             {
                 tracked = true;
+                if (region.IsCpuDirtyThroughout(offset, bytes))
+                {
+                    remaining -= bytes;
+                    offset = 0;
+                    index++;
+                    continue;
+                }
+
                 using (region.Lock.Hold())
                 {
                     if (region.IsModified(WriteOrigin.Gpu, offset, bytes))
diff --git a/src/SharpEmu.HLE/GpuMemory/TrackedRegion.cs b/src/SharpEmu.HLE/GpuMemory/TrackedRegion.cs
index 7dfe95c..9519cf3 100644
--- a/src/SharpEmu.HLE/GpuMemory/TrackedRegion.cs
+++ b/src/SharpEmu.HLE/GpuMemory/TrackedRegion.cs
@@ -46,6 +46,20 @@ public sealed class TrackedRegion
         return GetDirtyMask(side).AnyInRange(start, end);
     }
 
+    public bool IsCpuDirtyThroughout(ulong offset, ulong size)
+    {
+        var (start, end) = GetPageRange(BaseAddress + offset, size);
+        for (var page = start; page < end; page++)
+        {
+            if (!_cpuDirty.Get(page))
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
     public bool IsCpuWriteHot(ulong offset, ulong size)
     {
         var (start, end) = GetPageRange(BaseAddress + offset, size);