memorymemory-managementvirtual-memoryvirtual-address-spacepage-tables
Virtual Memory To Physical Translation?
My book had the following image:
And a question of how many PTE's are there in L2 (or L1), the answer was 16 = 2^4 but why is that?
In the question it's given that each PTE size is 2 bytes so the answer should be 2^4/2 = 8 Since L2 index holds where we will point to. For example if it's 2 then it point to second half of the first PTE and not the second PTE.
What am I missing here?
Solution
You are overthinking. There are 4 bits used to index the L1 page table entry, so there are 2^4 possible values for this index and thus 2^4 possible page tables entries.
The size of a page table entry is not relevant to this question. It is asking "how many", not "how large".
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