Question
Download Solution PDFConsider 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 ?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe 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.
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