Question

Advantages and disadvantages of three interleaved memory organization

Answer 1

Advantages :
Allocating memory is easy and cheap
Any free page is ok, OS can take first one out of list it keeps
Eliminates external fragmentation
Data (page frames) can be scattered all over PM
Pages are mapped appropriately anyway
Allows demand paging and prepaging
More efficient swapping
No need for considerations about fragmentation
Just swap out page least likely to be used



Disadvantages :
Longer memory access times (page table lookup)
Can be improved using TLB
Guarded page tables
Inverted page tables
Memory requirements (one entry per VM page)
Improve using Multilevel page tables and variable page sizes (super-pages)
Guarded page tables
Page Table Length Register (PTLR) to limit virtual memory size
Internal fragmentation