Memory

Page Size
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Page Size

The page size is sometimes a parameter that can be chosen by the operating system. Even if the hardware has been designed with, for instance, 512-byte pages, the operating system can easily regard page pairs 0 and 1, 2 and 3, 4 and 5, and so on, as 1-KB pages by always

Shared Libraries / Mapped Files
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Shared Libraries / Mapped Files

Sharing can be executed at other granularities than individual pages. If a program is started up twice, most operating systems will automatically share all the text pages so that only one copy is in memory. Text pages are always read only, so there is no problem here.

Backing Store
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Backing Store

In our study of page replacement algorithms, we saw how a page is chosen for removal. We have not said much about where on the disk it is put when it is paged out. Let us now explain some of the problems related to disk management. The simplest algorithm for allocating page

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