Memory Management

What is virtual memory?

Temporarily using secondary storage to simulate additional main memory, as only part of a program needs to be in RAM.

What is paging in memory management?

A large process is divided into pages of equal sizes, and the RAM is divided into frames.

What is a page table?

A page table contains the mappings of pages to page frames and tracks all the free frames.

What happens when there is no empty space in the memory during paging?

A page gets replaced with a new one, using replacement algorithms like first in first out, least recently used, or least used page.

What is a page frame?

Main memory divided into parts equal in size to a page.

Define segmentation in the context of memory management.

A large process is divided into segments which need not be the same size.

What is disk thrashing?

A situation where pages are continuously swapped in and out because the pages being swapped are inter-dependent.

What are the main algorithms used for page replacement?

First in first out, least recently used, and least used page.

How is virtual memory structured?

Virtual memory is divided into equal blocks called pages.

What is the purpose of a page table in memory management?

To translate logical addresses to physical addresses and track free memory frames.