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A method is described for use in a system for paging data between a memory and a mini disk.
English (United States)
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External Page Table Entry Extension
A method is described for use in a system for paging data between a memory
and a mini disk.
When a segment is mapped "write-new," the pages currently paged-out to
the paging mini-disk(s) do not require an immediate page-in Input-Output (I/O) as
part of the mapping.
An external page table entry (XPTE)-extension is pointed to from the parent
or original XPTE. The XPTE-extension contains the new mapping for that page.
The original XPTE retains the old mapping data with respect to the paging mini-
disk(s). The need for immediate page-in I/O is eliminated since the new mapping
is remembered without requiring destruction of the old mapping. The page-in I/O
is saved until page fault time, after which the original XPTE is updated with data
from its extension. The XPTE-extension is then discarded.