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Prefetch Confirmation/Access Array

IP.com Disclosure Number: IPCOM000061684D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Emma, PG Knight, JW Pomerene, JH Rechtschaffen, RN Sparacio, FJ [+details]

Abstract

In sequential prefetching schemes which prefetch directly into a cache, care must be taken to distinguish between lines which are prefetched and never accessed and those which are prefetched and accessed or demand fetched. A class of prior confirmation techniques turn off a confirmation bit in a confirmation array when a corresponding line is prefetched and set the confirmation bit on exit from the cache so as to prompt prefetching of that line under suitable conditions subsequently. For simplicity, it is assumed herein that the confirmation bit for line X controls the prefetching of line X. The confirmation array can now have a dual purpose: 1. Prompts prefetching for lines not in the cache 2.