Mastering Demand Paging

Demand paging is a technique used in virtual memory systems where pages are only brought into memory when they are demanded by the running program. This helps to reduce the amount of physical memory needed and allows for efficient memory management. A neat sketch should illustrate the concept of bringing pages into memory on demand.

Demand paging allows for efficient memory management by bringing pages into memory only when they are needed, reducing the amount of physical memory needed and allowing for larger virtual address spaces. It also helps to minimize the initial loading time of the program and allows for better overall system performance.

Demand paging only brings pages into memory when they are demanded by the running program, while pre-paging brings in additional pages before they are actually needed. Demand paging helps to minimize unnecessary memory usage, while pre-paging aims to reduce the likelihood of page faults by bringing in anticipated pages ahead of time.