An allocator and deallocator go hand in hand. For the JVM, most of the GCs are compacting so they can use bump allocators. In that case, yes, it is a solved pro

An allocator and deallocator go hand in hand. For the JVM, most of the GCs are compacting so they can use bump allocators. In that case, yes, it is a solved problem. However, it depends on the alloator/deallocator pair and traditional malloc/free implementations involve many trade offs, so allocation work continues.