Advantage:
Demand paging, as opposed to loading all pages immediately:
* Only loads pages that are demanded by the executing process.
* As there is more space in main memory, more processes can be loaded reducing context switching time which utilizes large amounts of resources.
* Less loading latency occurs at program startup, as less information is accessed from secondary storage and less information is brought into main memory.
* Does not need extra hardware support than what paging needs, since protection fault can be used to get page fault.
Disadvantage:
* Individual programs face extra latency when they access a page for the first time. So demand paging may have lower performance than anticipatory paging algorithms such as prepaging.
* Programs running on low-cost, low-power embedded systems may not have a memory management unit that supports page replacement.
* Memory management with page replacement algorithms becomes slightly more complex.
* Possible security risks, including vulnerability to timing attacks
Demand paging, as opposed to loading all pages immediately:
* Only loads pages that are demanded by the executing process.
* As there is more space in main memory, more processes can be loaded reducing context switching time which utilizes large amounts of resources.
* Less loading latency occurs at program startup, as less information is accessed from secondary storage and less information is brought into main memory.
* Does not need extra hardware support than what paging needs, since protection fault can be used to get page fault.
Disadvantage:
* Individual programs face extra latency when they access a page for the first time. So demand paging may have lower performance than anticipatory paging algorithms such as prepaging.
* Programs running on low-cost, low-power embedded systems may not have a memory management unit that supports page replacement.
* Memory management with page replacement algorithms becomes slightly more complex.
* Possible security risks, including vulnerability to timing attacks
