Two Level Page Table Size

The page table is a key component of virtual address.

Two level page table size.

2 level page tables physical address pa. 12 bits page size. A page table is the data structure used by a virtual memory system in a computer operating system to store the mapping between virtual addresses and physical addresses virtual addresses are used by the program executed by the accessing process while physical addresses are used by the hardware or more specifically by the ram subsystem. It asks to compute the memory space needed for a two level page table.

Prerequisite paging multilevel paging is a paging scheme which consist of two or more levels of page tables in a hierarchical manner. Thus the total size of the top level page table is 2 10 entries 2 2 bytes per entry 2 12 bytes 4kb. 38 12 26 bits number of physical pages. 212 bytes 4kb page frame number field in pa.

Thus we can stop here. So size of outer page table 2 10 4b 4kb. This is two level paging because here we got 2 page tables. 238 bytes offset or displacement field in pa.

If so we could repeat this process by paging the top level page table thus introducing another. 38 bits physical address space. 32 bit virtual address 4kib per page 4b size of page table entrie 1 gib size of address space. Of pages of the page table 2 outer page table 2 22 2 12 2 10 pages.

Thus here our outer page table page table 2 can be stored in one frame. The logical addresses are 32 bit page size is 4kb and the page entry size is 4 bytes. But if still the size of page table is more than. It is also known as hierarchical paging.

238 212 226 pa. With different numbers we could have a very large top level page table. For a process is using 1gib address space find out size of 1 level page table and 2 levels page table when page table directory has got 1024 entries.