Page Frames

Paging
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Paging

Most virtual memory systems use a technique called paging, which we will now explain. On any computer, programs reference a set of memory addresses. When a program implements an instruction like

Load Control
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Load Control

Even with the best page replacement algorithm and optimal global allocation of page frames to processes, it can come about that the system thrashes. Actually, whenever the combined working sets of all processes exceed the capacity of memory, thrashing can be expected. One

Separate Instruction and Data Spaces / Shared Pages
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Separate Instruction and Data Spaces / Shared Pages

The majority of computers have a single address space that holds both programs and data, as shown in Figure 1(a). If this address space is large enough, everything works fine. On the other hand, it is often too small, forcing programmers to stand on their heads to fit everything

Cleaning Policy / Virtual Memory Interface
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Cleaning Policy / Virtual Memory Interface

Paging works best when there are lots of free page frames that can be claimed as page faults take place. If every page frame is full, and moreover customized, before a new page can be brought in, an old page must first be written to disk. To make sure a plentiful supply of free

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