Yep exactly, at it's simplest all an allocator is doing is keeping track of which memory areas are owned and their addresses. In a sense even the stack pointer

Yep exactly, at it's simplest all an allocator is doing is keeping track of which memory areas are owned and their addresses. In a sense even the stack pointer is a kind of allocator (you can assign the memory pointed to by the stack pointer and then increment it for the next use)