Types of Memory
Various levels of abstraction have been introduced to facilitate the use of relocatable code, shared memory objects, and private data areas. To support these abstraction layers, memory must be managed from the logical, virtual, and physical page levels. In addition, memory page images may be stored on a disk device as part of a “front store” or in a “back store” when the kernel needs to temporarily move them out of the way.
Logical Memory
As we discussed in Chapter 5, “Process and Thread Management from the Process's Viewpoint,” a process takes a “logical” view of memory. As far as the process is concerned, it is only interested in its own memory requirements: Where is my code? Where is my data? Where are the shared library routines ...
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