Consider a system with page size p and average process size m and size of each page table entry is e. What is the amount of space required by page table ? 

The correct answer is me/p.

Key Points

• The page table is a data structure used in computer operating systems to manage the mapping between virtual addresses and physical addresses.
• Each entry in the page table corresponds to a page in the virtual memory and contains information about the physical memory location of that page.
• The size of the page table depends on the number of pages in the process and the size of each page table entry.
• Given:
  • Page size (p)
  • Average process size (m)
  • Size of each page table entry (e)
• To calculate the number of pages, divide the average process size by the page size: m/p
• To find the total space required by the page table, multiply the number of pages by the size of each page table entry: (m/p) * e
• Simplifying the expression gives the total space required as me/p

Additional Information

• The page table allows the operating system to efficiently manage memory allocation and ensure that processes do not interfere with each other's memory.
• Modern operating systems use hierarchical or multi-level page tables to optimize memory usage and reduce the size of page tables for large address spaces.
• Page tables also play a crucial role in implementing virtual memory, allowing systems to use disk space to extend the available physical memory.