What is the main disadvantage of PAGER?
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Advantages :
Allocating memory is easy and cheapAny free page is ok, OS can take first one out of list it keepsEliminates external fragmentationData (page frames) can be scattered all over PMPages are mapped appropriately anywayAllows demand paging and prepagingMore efficient swappingNo need for considerations about fragmentationJust swap out page least likely to be used
Disadvantages :
Longer memory access times (page table lookup)Can be improved using TLBGuarded page tablesInverted page tablesMemory requirements (one entry per VM page)Improve using Multilevel page tables and variable page sizes (super-pages)Guarded page tablesPage Table Length Register (PTLR) to limit virtual memory sizeInternal fragmentation
Allocating memory is easy and cheapAny free page is ok, OS can take first one out of list it keepsEliminates external fragmentationData (page frames) can be scattered all over PMPages are mapped appropriately anywayAllows demand paging and prepagingMore efficient swappingNo need for considerations about fragmentationJust swap out page least likely to be used
Disadvantages :
Longer memory access times (page table lookup)Can be improved using TLBGuarded page tablesInverted page tablesMemory requirements (one entry per VM page)Improve using Multilevel page tables and variable page sizes (super-pages)Guarded page tablesPage Table Length Register (PTLR) to limit virtual memory sizeInternal fragmentation
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