Run Lua GC in every frame

apps/openmw/mwlua/luamanagerimp.cpp

@@ -131,6 +131,10 @@ namespace MWLua
     void LuaManager::update()
     {
         static const bool luaDebug = Settings::Manager::getBool("lua debug", "Lua");
+        static const int gcStepCount = Settings::Manager::getInt("gc steps per frame", "Lua");
+        if (gcStepCount > 0)
+            lua_gc(mLua.sol(), LUA_GCSTEP, gcStepCount);
+
         if (mPlayer.isEmpty())
             return;  // The game is not started yet.
 

docs/source/reference/modding/settings/lua.rst

@@ -26,3 +26,15 @@ If one, a separate thread is used.
 Values >1 are not yet supported.
 
 This setting can only be configured by editing the settings configuration file.
+
+gc steps per frame
+------------------
+
+:Type:		integer
+:Range:		>= 0
+:Default:	100
+
+Lua garbage collector steps per frame. The higher the value the more time Lua runtime can spend on freeing unused memory.
+
+This setting can only be configured by editing the settings configuration file.
+

files/settings-default.cfg

@@ -1141,6 +1141,9 @@ lua debug = false
 # If zero, Lua scripts are processed in the main thread.
 lua num threads = 1
 
+# Lua garbage collector steps per frame.
+gc steps per frame = 100
+
 [Stereo]
 # Enable/disable stereo view. This setting is ignored in VR.
 stereo enabled = false