The process table has a pointer to an mm_struct for each process.

The mm_struct:

• pgd: address of the process's page table
• mmap: pointer to linked list of the process's area structs

mmap points to a linked list of vm_area_struct's stored in the kernel portion of the process's virtual memory.

One vm_area_struct for each segment

• user stack
• heap
• unitialized data
• initialized data
• program text