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Page attribute table

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The Page Attribute Table (also known as Page Allocation Table) is an extension to the page table format of certain x86 and x86-64 microprocessors. Like Memory Type Range Registers (MTRRs), they allow for fine-grained control over how areas of memory are cached.

Unlike MTRRs, which provide the ability to manipulate the behavior of caching for a limited number of fixed physical address ranges, Page Attribute Tables allow for such behavior to be specified on a per-page basis, greatly increasing the ability of the operating system to select the most efficient behavior for any given task.

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