13. The Abstraction: Address Spaces

Question 1

What are three basic parts of process’s address space?

Answer 1

Code, stack and heap.

Question 1

How and why does OS abstract physical memory?

Answer 1

It does so with help of virtual address space and for protection. Virtual address space is a process’s view of memory

Question 2

Where is code segment, stack and heap are placed in a basic non-segmented address space?

Answer 2

Code at the start, heap comes next and grows downward, stack at the bottom and grows upward

Question 3

What is pmap() Linux command?

Answer 3

It’s command to show memory mapping of a process (allocated regions, RSS, dirty pages, permissions, sizes)