Abstraction Layers
We have used the term abstraction and should spend a moment talking about what it means with regard to kernel design. When we consider the task of resource management, we must determine the level of control we wish to implement in our management scheme. One of the tricks of the trade involves grouping individual components of a system resource into uniform-sized blocks, chunks, extents, pages, and so on. The availability of the resource is then tracked at the level of these granular units, thus reducing the complexity of kernel data structures.
A classic case is that of memory management. A computer's physical RAM consists of circuits representing single bits of data storage; these are combined into sets of eight and referred ...
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