memory management

Question

In paging no. of entries in page table is same as no. of pages in LAS what does this mean? Does this mean the pages present at particular time in LAS only those pages should be present in page table?

Answer 1

LAS (Logical Address Space), this is the space occupied by the program in the memory. When you divided the program into the small size of pages, then you have to keep track of which pages is into the main memory. Hence you need a table, which has equal no of entries as the number of pages in the program. This page table entries are numbered from 1 to n (if there are n pages in the program).

Suppose 5th entries of the page table contains the 1, it means that 5th page of the program is loaded into the main memory, if it is 0 then it's not loaded.

I hope I answer you well. If you have any other queries regarding this, then just let me know.

Comments

yes u have cleared my doubt. thanks