Two Level Page Table Size
But if still the size of page table is more than.
Two level page table size. If so we could repeat this process by paging the top level page table thus introducing another. Thus the total size of the top level page table is 2 10 entries 2 2 bytes per entry 2 12 bytes 4kb. 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.
Thus we can stop here. 2 level page tables physical address pa. With different numbers we could have a very large top level page table. The page table is a key component of virtual address.
12 bits page size. Of pages of the page table 2 outer page table 2 22 2 12 2 10 pages. It is also known as hierarchical paging. 38 12 26 bits number of physical pages.
The logical addresses are 32 bit page size is 4kb and the page entry size is 4 bytes. 238 212 226 pa. So size of outer page table 2 10 4b 4kb. 238 bytes offset or displacement field in pa.
From the page size i found out that the offset is 12bits from the 32 of the memory address and that every page has 1024 entries. This is two level paging because here we got 2 page tables. 212 bytes 4kb page frame number field in pa. The entries of the level 1 page table are pointers to a level 2 page table and entries of the level 2 page tables are pointers to a level 3 page table and so on.
38 bits physical address space. Thus here our outer page table page table 2 can be stored in one frame. 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.