Merge pull request #14056 from jordan-woyak/cached-blob-reader

Core/DiscIO: Add a setting to load games into memory.

13 files changed, 313 insertions, 13 deletions

diff --git a/Source/Core/Common/MemArena.h b/Source/Core/Common/MemArena.h
index d9d472079c..dd07f70398 100644
--- a/Source/Core/Common/MemArena.h
+++ b/Source/Core/Common/MemArena.h
@@ -187,6 +187,14 @@ public:
 #endif
   }
 
+  void EnsureMemoryPagesWritable(size_t offset, size_t size)
+  {
+#ifdef _WIN32
+    for (const auto end_offset = offset + size; offset < end_offset; offset += BLOCK_SIZE)
+      EnsureMemoryPageWritable(offset);
+#endif
+  }
+
 private:
   void* m_memory = nullptr;
   size_t m_size = 0;
diff --git a/Source/Core/Core/Boot/Boot.cpp b/Source/Core/Core/Boot/Boot.cpp
index 755ed0427a..236cea81b9 100644
--- a/Source/Core/Core/Boot/Boot.cpp
+++ b/Source/Core/Core/Boot/Boot.cpp
@@ -240,7 +240,7 @@ std::unique_ptr<BootParameters> BootParameters::GenerateFromFile(std::vector<std
        ".elf"}};
   if (disc_image_extensions.contains(extension))
   {
-    std::unique_ptr<DiscIO::VolumeDisc> disc = DiscIO::CreateDisc(path);
+    std::unique_ptr<DiscIO::VolumeDisc> disc = DiscIO::CreateDiscForCore(path);
     if (disc)
     {
       return std::make_unique<BootParameters>(Disc{std::move(path), std::move(disc), paths},
@@ -469,7 +469,7 @@ static void SetDefaultDisc(DVD::DVDInterface& dvd_interface)
 {
   const std::string default_iso = Config::Get(Config::MAIN_DEFAULT_ISO);
   if (!default_iso.empty())
-    SetDisc(dvd_interface, DiscIO::CreateDisc(default_iso));
+    SetDisc(dvd_interface, DiscIO::CreateDiscForCore(default_iso));
 }
 
 static void CopyDefaultExceptionHandlers(Core::System& system)
@@ -629,7 +629,7 @@ bool CBoot::BootUp(Core::System& system, const Core::CPUThreadGuard& guard,
       if (ipl.disc)
       {
         NOTICE_LOG_FMT(BOOT, "Inserting disc: {}", ipl.disc->path);
-        SetDisc(system.GetDVDInterface(), DiscIO::CreateDisc(ipl.disc->path),
+        SetDisc(system.GetDVDInterface(), DiscIO::CreateDiscForCore(ipl.disc->path),
                 ipl.disc->auto_disc_change_paths);
       }
       else
diff --git a/Source/Core/Core/Config/MainSettings.cpp b/Source/Core/Core/Config/MainSettings.cpp
index 4e06ec3713..e42796e864 100644
--- a/Source/Core/Core/Config/MainSettings.cpp
+++ b/Source/Core/Core/Config/MainSettings.cpp
@@ -58,6 +58,7 @@ constexpr bool DEFAULT_CPU_THREAD = true;
 constexpr bool DEFAULT_CPU_THREAD = false;
 #endif
 const Info<bool> MAIN_CPU_THREAD{{System::Main, "Core", "CPUThread"}, DEFAULT_CPU_THREAD};
+const Info<bool> MAIN_LOAD_GAME_INTO_MEMORY{{System::Main, "Core", "LoadGameIntoMemory"}, false};
 const Info<bool> MAIN_SYNC_ON_SKIP_IDLE{{System::Main, "Core", "SyncOnSkipIdle"}, true};
 const Info<std::string> MAIN_DEFAULT_ISO{{System::Main, "Core", "DefaultISO"}, ""};
 const Info<bool> MAIN_ENABLE_CHEATS{{System::Main, "Core", "EnableCheats"}, false};
diff --git a/Source/Core/Core/Config/MainSettings.h b/Source/Core/Core/Config/MainSettings.h
index 86f206d3f4..b6a7094c93 100644
--- a/Source/Core/Core/Config/MainSettings.h
+++ b/Source/Core/Core/Config/MainSettings.h
@@ -68,6 +68,7 @@ extern const Info<bool> MAIN_CORRECT_TIME_DRIFT;
 extern const Info<bool> MAIN_RUSH_FRAME_PRESENTATION;
 extern const Info<bool> MAIN_SMOOTH_EARLY_PRESENTATION;
 extern const Info<bool> MAIN_CPU_THREAD;
+extern const Info<bool> MAIN_LOAD_GAME_INTO_MEMORY;
 extern const Info<bool> MAIN_SYNC_ON_SKIP_IDLE;
 extern const Info<std::string> MAIN_DEFAULT_ISO;
 extern const Info<bool> MAIN_ENABLE_CHEATS;
diff --git a/Source/Core/Core/HW/DVD/DVDInterface.cpp b/Source/Core/Core/HW/DVD/DVDInterface.cpp
index 410f5763a5..49cafccb70 100644
--- a/Source/Core/Core/HW/DVD/DVDInterface.cpp
+++ b/Source/Core/Core/HW/DVD/DVDInterface.cpp
@@ -428,7 +428,8 @@ void DVDInterface::EjectDiscCallback(Core::System& system, u64 userdata, s64 cyc
 void DVDInterface::InsertDiscCallback(Core::System& system, u64 userdata, s64 cyclesLate)
 {
   auto& di = system.GetDVDInterface();
-  std::unique_ptr<DiscIO::VolumeDisc> new_disc = DiscIO::CreateDisc(di.m_disc_path_to_insert);
+  std::unique_ptr<DiscIO::VolumeDisc> new_disc =
+      DiscIO::CreateDiscForCore(di.m_disc_path_to_insert);
 
   if (new_disc)
     di.SetDisc(std::move(new_disc), {});
diff --git a/Source/Core/DiscIO/CMakeLists.txt b/Source/Core/DiscIO/CMakeLists.txt
index 884f3de4f2..e2664f4a1a 100644
--- a/Source/Core/DiscIO/CMakeLists.txt
+++ b/Source/Core/DiscIO/CMakeLists.txt
@@ -3,6 +3,8 @@ add_library(discio
   Blob.h
   CISOBlob.cpp
   CISOBlob.h
+  CachedBlob.cpp
+  CachedBlob.h
   CompressedBlob.cpp
   CompressedBlob.h
   DirectoryBlob.cpp
diff --git a/Source/Core/DiscIO/CachedBlob.cpp b/Source/Core/DiscIO/CachedBlob.cpp
new file mode 100644
index 0000000000..98ed8ba31f
--- /dev/null
+++ b/Source/Core/DiscIO/CachedBlob.cpp
@@ -0,0 +1,239 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "DiscIO/CachedBlob.h"
+
+#include <atomic>
+#include <chrono>
+#include <thread>
+
+#include "Common/CommonTypes.h"
+#include "Common/Logging/Log.h"
+#include "Common/MemArena.h"
+
+#include "DiscIO/DiscScrubber.h"
+#include "DiscIO/Volume.h"
+
+namespace DiscIO
+{
+class CacheFiller final
+{
+public:
+  explicit CacheFiller(std::unique_ptr<BlobReader> reader, bool attempt_to_scrub)
+      : m_thread{&CacheFiller::ThreadFunc, this, std::move(reader), attempt_to_scrub}
+  {
+  }
+
+  ~CacheFiller()
+  {
+    m_stop_thread.store(true, std::memory_order_relaxed);
+    m_thread.join();
+  }
+
+  bool Read(u64 offset, u64 size, u8* out_ptr)
+  {
+    if (size == 0)
+    {
+      // Just return early to safely handle a read of zero if that were to happen.
+      // This avoids a m_memory_region_data initialization race.
+      return true;
+    }
+
+    switch (GetCacheState(offset, size))
+    {
+    case CacheState::Cached:
+      std::memcpy(out_ptr, m_memory_region_data + offset, size);
+      return true;
+
+    case CacheState::Scrubbed:
+      WARN_LOG_FMT(DISCIO,
+                   "CachedBlobReader: Read({}, {}) hits a scrubbed cluster which is not cached.",
+                   offset, size);
+      return false;
+
+    default:
+      return false;
+    }
+  }
+
+private:
+  enum class CacheState
+  {
+    Cached,
+    NotCached,
+    Scrubbed,
+  };
+
+  CacheState GetCacheState(u64 offset, u64 size)
+  {
+    const auto cache_pos = m_cache_filled_pos.load(std::memory_order_acquire);
+
+    const auto end_pos = offset + size;
+    if (end_pos > cache_pos)
+      return CacheState::NotCached;
+
+    for (u64 i = offset; i < end_pos; i += DiscScrubber::CLUSTER_SIZE)
+    {
+      if (m_scrubber.CanBlockBeScrubbed(i))
+        return CacheState::Scrubbed;
+    }
+
+    return CacheState::Cached;
+  }
+
+  void ThreadFunc(std::unique_ptr<BlobReader> reader, bool attempt_to_scrub)
+  {
+    static constexpr auto PERIODIC_LOG_TIME = std::chrono::seconds{1};
+
+    const auto start_time = Clock::now();
+    const u64 total_size = reader->GetDataSize();
+
+    m_memory_region_data = static_cast<u8*>(m_memory_region.Create(total_size));
+    if (m_memory_region_data == nullptr)
+    {
+      ERROR_LOG_FMT(DISCIO, "CachedBlobReader: Failed to create memory region.");
+      return;
+    }
+
+    // Returns CLUSTER_SIZE or smaller at the end of the file.
+    const auto get_read_size = [&](u64 pos) {
+      return std::min<u64>(total_size - pos, DiscScrubber::CLUSTER_SIZE);
+    };
+
+    // Used for periodic progress logging.
+    u64 total_bytes_to_commit = total_size;
+
+    if (attempt_to_scrub)
+    {
+      const auto volume = CreateVolume(reader->CopyReader());
+      if (volume != nullptr && m_scrubber.SetupScrub(*volume))
+      {
+        for (u64 i = 0; i < total_size; i += DiscScrubber::CLUSTER_SIZE)
+        {
+          if (m_scrubber.CanBlockBeScrubbed(i))
+            total_bytes_to_commit -= get_read_size(i);
+        }
+      }
+      else
+      {
+        WARN_LOG_FMT(DISCIO, "CachedBlobReader: Failed to scrub. The entire file will be cached.");
+      }
+    }
+
+    auto next_log_time = start_time + PERIODIC_LOG_TIME;
+    u64 read_offset = 0;
+    u64 committed_count = 0;
+
+    while (true)
+    {
+      if (m_stop_thread.load(std::memory_order_relaxed))
+      {
+        INFO_LOG_FMT(DISCIO, "CachedBlobReader: Stopped");
+        break;
+      }
+
+      const auto read_size = get_read_size(read_offset);
+      if (read_size == 0)
+      {
+        const auto total_time = DT_s{Clock::now() - start_time}.count();
+
+        static constexpr auto mib_scale = double(1 << 20);
+
+        NOTICE_LOG_FMT(
+            DISCIO, "CachedBlobReader: Completed. Cached {:.2f} of {:.2f} MiB in {:.2f} seconds.",
+            committed_count / mib_scale, total_size / mib_scale, total_time);
+        break;
+      }
+
+      if (!m_scrubber.CanBlockBeScrubbed(read_offset))
+      {
+        m_memory_region.EnsureMemoryPagesWritable(read_offset, read_size);
+
+        if (!reader->Read(read_offset, read_size, m_memory_region_data + read_offset))
+        {
+          ERROR_LOG_FMT(DISCIO, "CachedBlobReader: Read({}, {}) failed.", read_offset, read_size);
+          break;
+        }
+
+        committed_count += read_size;
+      }
+
+      read_offset += read_size;
+      m_cache_filled_pos.store(read_offset, std::memory_order_release);
+
+      if (const auto now = Clock::now(); now >= next_log_time)
+      {
+        INFO_LOG_FMT(DISCIO, "CachedBlobReader: Progress: {}%",
+                     committed_count * 100 / total_bytes_to_commit);
+        next_log_time = now + PERIODIC_LOG_TIME;
+      }
+    }
+  }
+
+  // The thread has read non-scrubbed bytes into memory up to this point.
+  std::atomic<u64> m_cache_filled_pos{};
+
+  Common::LazyMemoryRegion m_memory_region;
+  u8* m_memory_region_data{};
+
+  DiscScrubber m_scrubber;
+
+  std::atomic_bool m_stop_thread{};
+  std::thread m_thread;
+};
+
+class CachedBlobReader final : public BlobReader
+{
+public:
+  explicit CachedBlobReader(std::unique_ptr<BlobReader> reader, bool attempt_to_scrub)
+      : m_cache_filler{std::make_shared<CacheFiller>(reader->CopyReader(), attempt_to_scrub)},
+        m_reader{std::move(reader)}
+
+  {
+    INFO_LOG_FMT(DISCIO, "CachedBlobReader: Created");
+  }
+
+  CachedBlobReader(std::shared_ptr<CacheFiller> cache_filler, std::unique_ptr<BlobReader> reader)
+      : m_cache_filler{std::move(cache_filler)}, m_reader{std::move(reader)}
+  {
+    INFO_LOG_FMT(DISCIO, "CachedBlobReader: Copied");
+  }
+
+  std::unique_ptr<BlobReader> CopyReader() const override
+  {
+    return std::make_unique<CachedBlobReader>(m_cache_filler, m_reader->CopyReader());
+  }
+
+  BlobType GetBlobType() const override { return m_reader->GetBlobType(); }
+  u64 GetRawSize() const override { return GetDataSize(); }
+  u64 GetDataSize() const override { return m_reader->GetDataSize(); }
+  DataSizeType GetDataSizeType() const override { return m_reader->GetDataSizeType(); }
+
+  u64 GetBlockSize() const override { return 0; }
+  bool HasFastRandomAccessInBlock() const override { return true; }
+  std::string GetCompressionMethod() const override { return {}; }
+  std::optional<int> GetCompressionLevel() const override { return std::nullopt; }
+
+  bool Read(u64 offset, u64 size, u8* out_ptr) override
+  {
+    return m_cache_filler->Read(offset, size, out_ptr) || m_reader->Read(offset, size, out_ptr);
+  }
+
+private:
+  // A shared object does the cache filling for sensible CopyReader behavior.
+  const std::shared_ptr<CacheFiller> m_cache_filler;
+
+  const std::unique_ptr<BlobReader> m_reader;
+};
+
+std::unique_ptr<BlobReader> CreateCachedBlobReader(std::unique_ptr<BlobReader> reader)
+{
+  return std::make_unique<CachedBlobReader>(std::move(reader), false);
+}
+
+std::unique_ptr<BlobReader> CreateScrubbingCachedBlobReader(std::unique_ptr<BlobReader> reader)
+{
+  return std::make_unique<CachedBlobReader>(std::move(reader), true);
+}
+
+}  // namespace DiscIO
diff --git a/Source/Core/DiscIO/CachedBlob.h b/Source/Core/DiscIO/CachedBlob.h
new file mode 100644
index 0000000000..f99ad552bb
--- /dev/null
+++ b/Source/Core/DiscIO/CachedBlob.h
@@ -0,0 +1,16 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <memory>
+
+#include "DiscIO/Blob.h"
+
+namespace DiscIO
+{
+
+std::unique_ptr<BlobReader> CreateCachedBlobReader(std::unique_ptr<BlobReader> reader);
+std::unique_ptr<BlobReader> CreateScrubbingCachedBlobReader(std::unique_ptr<BlobReader> reader);
+
+}  // namespace DiscIO
diff --git a/Source/Core/DiscIO/Volume.cpp b/Source/Core/DiscIO/Volume.cpp
index b6d84254f0..7e5dcc7976 100644
--- a/Source/Core/DiscIO/Volume.cpp
+++ b/Source/Core/DiscIO/Volume.cpp
@@ -3,7 +3,7 @@
 
 #include "DiscIO/Volume.h"
 
-#include <algorithm>
+#include <functional>
 #include <map>
 #include <memory>
 #include <optional>
@@ -16,8 +16,11 @@
 #include "Common/Crypto/SHA1.h"
 #include "Common/StringUtil.h"
 
+#include "Core/Config/MainSettings.h"
 #include "Core/IOS/ES/Formats.h"
+
 #include "DiscIO/Blob.h"
+#include "DiscIO/CachedBlob.h"
 #include "DiscIO/DiscUtils.h"
 #include "DiscIO/Enums.h"
 #include "DiscIO/VolumeDisc.h"
@@ -84,16 +87,21 @@ std::map<Language, std::string> Volume::ReadWiiNames(const std::vector<char16_t>
   return names;
 }
 
-static std::unique_ptr<VolumeDisc> TryCreateDisc(std::unique_ptr<BlobReader>& reader)
+template <typename T = std::identity>
+static std::unique_ptr<VolumeDisc> TryCreateDisc(std::unique_ptr<BlobReader> reader,
+                                                 const T& reader_adapter_factory = {})
 {
   if (!reader)
     return nullptr;
 
+  // `reader_adapter_factory` is used *after* successful magic word read.
+  // This prevents `CachedBlobReader` from showing warnings when failing to scrub a .dol file.
+
   if (reader->ReadSwapped<u32>(0x18) == WII_DISC_MAGIC)
-    return std::make_unique<VolumeWii>(std::move(reader));
+    return std::make_unique<VolumeWii>(reader_adapter_factory(std::move(reader)));
 
   if (reader->ReadSwapped<u32>(0x1C) == GAMECUBE_DISC_MAGIC)
-    return std::make_unique<VolumeGC>(std::move(reader));
+    return std::make_unique<VolumeGC>(reader_adapter_factory(std::move(reader)));
 
   // No known magic words found
   return nullptr;
@@ -101,7 +109,7 @@ static std::unique_ptr<VolumeDisc> TryCreateDisc(std::unique_ptr<BlobReader>& re
 
 std::unique_ptr<VolumeDisc> CreateDisc(std::unique_ptr<BlobReader> reader)
 {
-  return TryCreateDisc(reader);
+  return TryCreateDisc(std::move(reader));
 }
 
 std::unique_ptr<VolumeDisc> CreateDisc(const std::string& path)
@@ -109,7 +117,15 @@ std::unique_ptr<VolumeDisc> CreateDisc(const std::string& path)
   return CreateDisc(CreateBlobReader(path));
 }
 
-static std::unique_ptr<VolumeWAD> TryCreateWAD(std::unique_ptr<BlobReader>& reader)
+std::unique_ptr<VolumeDisc> CreateDiscForCore(const std::string& path)
+{
+  if (Config::Get(Config::MAIN_LOAD_GAME_INTO_MEMORY))
+    return TryCreateDisc(CreateBlobReader(path), CreateScrubbingCachedBlobReader);
+
+  return CreateDisc(path);
+}
+
+static std::unique_ptr<VolumeWAD> TryCreateWAD(std::unique_ptr<BlobReader> reader)
 {
   if (!reader)
     return nullptr;
@@ -126,7 +142,7 @@ static std::unique_ptr<VolumeWAD> TryCreateWAD(std::unique_ptr<BlobReader>& read
 
 std::unique_ptr<VolumeWAD> CreateWAD(std::unique_ptr<BlobReader> reader)
 {
-  return TryCreateWAD(reader);
+  return TryCreateWAD(std::move(reader));
 }
 
 std::unique_ptr<VolumeWAD> CreateWAD(const std::string& path)
@@ -136,11 +152,11 @@ std::unique_ptr<VolumeWAD> CreateWAD(const std::string& path)
 
 std::unique_ptr<Volume> CreateVolume(std::unique_ptr<BlobReader> reader)
 {
-  std::unique_ptr<VolumeDisc> disc = TryCreateDisc(reader);
+  std::unique_ptr<VolumeDisc> disc = TryCreateDisc(std::move(reader));
   if (disc)
     return disc;
 
-  std::unique_ptr<VolumeWAD> wad = TryCreateWAD(reader);
+  std::unique_ptr<VolumeWAD> wad = TryCreateWAD(std::move(reader));
   if (wad)
     return wad;
 
diff --git a/Source/Core/DiscIO/Volume.h b/Source/Core/DiscIO/Volume.h
index a7273b0f0e..3f80cd2e3d 100644
--- a/Source/Core/DiscIO/Volume.h
+++ b/Source/Core/DiscIO/Volume.h
@@ -176,6 +176,9 @@ protected:
 
 std::unique_ptr<VolumeDisc> CreateDisc(std::unique_ptr<BlobReader> reader);
 std::unique_ptr<VolumeDisc> CreateDisc(const std::string& path);
+// This version enables caching when the "Load Games into Memory" setting is enabled.
+std::unique_ptr<VolumeDisc> CreateDiscForCore(const std::string& path);
+
 std::unique_ptr<VolumeWAD> CreateWAD(std::unique_ptr<BlobReader> reader);
 std::unique_ptr<VolumeWAD> CreateWAD(const std::string& path);
 std::unique_ptr<Volume> CreateVolume(std::unique_ptr<BlobReader> reader);
diff --git a/Source/Core/DolphinLib.props b/Source/Core/DolphinLib.props
index 5e81cea3a6..37860aa734 100644
--- a/Source/Core/DolphinLib.props
+++ b/Source/Core/DolphinLib.props
@@ -485,6 +485,7 @@
     <ClInclude Include="Core\WiiUtils.h" />
     <ClInclude Include="DiscIO\Blob.h" />
     <ClInclude Include="DiscIO\CISOBlob.h" />
+    <ClInclude Include="DiscIO\CachedBlob.h" />
     <ClInclude Include="DiscIO\CompressedBlob.h" />
     <ClInclude Include="DiscIO\DirectoryBlob.h" />
     <ClInclude Include="DiscIO\DiscExtractor.h" />
@@ -1170,6 +1171,7 @@
     <ClCompile Include="Core\WC24PatchEngine.cpp" />
     <ClCompile Include="DiscIO\Blob.cpp" />
     <ClCompile Include="DiscIO\CISOBlob.cpp" />
+    <ClCompile Include="DiscIO\CachedBlob.cpp" />
     <ClCompile Include="DiscIO\CompressedBlob.cpp" />
     <ClCompile Include="DiscIO\DirectoryBlob.cpp" />
     <ClCompile Include="DiscIO\DiscExtractor.cpp" />
diff --git a/Source/Core/DolphinQt/Settings/GeneralPane.cpp b/Source/Core/DolphinQt/Settings/GeneralPane.cpp
index 93e3d0d9c8..661f5f13b2 100644
--- a/Source/Core/DolphinQt/Settings/GeneralPane.cpp
+++ b/Source/Core/DolphinQt/Settings/GeneralPane.cpp
@@ -90,6 +90,7 @@ void GeneralPane::OnEmulationStateChanged(Core::State state)
 
   m_checkbox_dualcore->setEnabled(!running);
   m_checkbox_cheats->setEnabled(!running);
+  m_checkbox_load_games_into_memory->setEnabled(!running);
   m_checkbox_override_region_settings->setEnabled(!running);
 #ifdef USE_DISCORD_PRESENCE
   m_checkbox_discord_presence->setEnabled(!running);
@@ -147,6 +148,15 @@ void GeneralPane::CreateBasic()
   m_checkbox_cheats = new ConfigBool(tr("Enable Cheats"), Config::MAIN_ENABLE_CHEATS);
   basic_group_layout->addWidget(m_checkbox_cheats);
 
+  m_checkbox_load_games_into_memory =
+      new ConfigBool(tr("Load Whole Game Into Memory"), Config::MAIN_LOAD_GAME_INTO_MEMORY);
+  basic_group_layout->addWidget(m_checkbox_load_games_into_memory);
+  m_checkbox_load_games_into_memory->SetDescription(
+      tr("Loads the running game into memory in the background."
+         "<br><br>This may improve performance with slow or high-latency storage."
+         "<br>System memory requirements will be much higher with this setting enabled."
+         "<br><br><dolphin_emphasis>If unsure, leave this unchecked.</dolphin_emphasis>"));
+
   m_checkbox_override_region_settings =
       new ConfigBool(tr("Allow Mismatched Region Settings"), Config::MAIN_OVERRIDE_REGION_SETTINGS);
   basic_group_layout->addWidget(m_checkbox_override_region_settings);
diff --git a/Source/Core/DolphinQt/Settings/GeneralPane.h b/Source/Core/DolphinQt/Settings/GeneralPane.h
index 17d80f7c38..b482172b09 100644
--- a/Source/Core/DolphinQt/Settings/GeneralPane.h
+++ b/Source/Core/DolphinQt/Settings/GeneralPane.h
@@ -48,6 +48,7 @@ private:
   ToolTipComboBox* m_combobox_fallback_region;
   ConfigBool* m_checkbox_dualcore;
   ConfigBool* m_checkbox_cheats;
+  ConfigBool* m_checkbox_load_games_into_memory;
   ConfigBool* m_checkbox_override_region_settings;
   ConfigBool* m_checkbox_auto_disc_change;
 #ifdef USE_DISCORD_PRESENCE