Writing to a memory page with code present only causes code block flushes if the data changes, or if a block is currently being recompiled.

src/codegen.c

@@ -17,3 +17,5 @@ void codegen_timing_set(codegen_timing_t *timing)
         codegen_timing_block_start = timing->block_start;
         codegen_timing_block_end = timing->block_end;
 }
+
+int codegen_in_recompile;