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consider a system with a 32 bit logical address space, if the page size is 4kb, then the two level paging will have:
page number | page offset
|
______p1______ ______p2_____|________d____
|______10______|______10_____|________12___|
why each page (p1 and p2) both have 10 and 10? why not 8 and 12?
I think it's an arbitrary decision. If you were designing a system, you could perfectly well choose 8 and 12.
The advantage to having 10 and 10 however, is that it gives the page directory and each page table 1024 entries. If each page table entry is 32 bits, the page tables are exactly the size of a page themselves.
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