Virtualizing the memory will allow multiple programs running at the same time and provide protection to the actual memory. Each process will have an abstraction to use the physical memory and their own address space (so different processes won’t affect each other’s memory).

The three goals for VM are:

• transparency: VM is invisible to the running program, so they don’t know the memory they used is virtualized
• efficiency: virtualization should be efficient in terms of both time and space
• protection: processes shouldn’t access other processes’ memory

Memory APIs

in C, we have access to heap by using malloc() and free() and all the other behaviors are done to stack.