Why does each process need its own page table?

Question

I read about memory management techniques and wondered:

Why does each process need its own page table?

thanks.

Answer 1

Why does each process need its own page table?

This is not true. But each address space needs its own page table, and on most operating systems each process has its own address space.

(The OS for IBM iSeries has only one page table, since it uses the "single address space" model.)