Quote: use the page fault handler to implement quick page accessibility tests; a page fault only occurs on a negative answer

Quotation Skeleton

The [page accessibility tests] should be very fast in the … occurring negative case. The basic idea is to … does not change data in the page, 3. … independent of the data contained in the page. … Now we extend the [machine] instruction's semantics by … [it test instruction within kernel] skip instr and set flags negative … [e.g., for 486 use 'testb 0' for access and 'andb 0xff' for writable]   Google-1   Google-2

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