公开(公告)号：US20170091104A1

公开(公告)日：2017-03-30

申请号：US14870594

申请日：2015-09-30

Applicant: ARM LIMITED

Inventor： Todd RAFACZ ,  Huzefa SANJELIWALA

IPC: G06F12/08

CPC classification number: G06F12/0862 ,  G06F2212/1016 ,  G06F2212/1021 ,  G06F2212/602 ,  G06F2212/6024 ,  G06F2212/6026

Abstract: Prefetch apparatus and a method of prefetching are presented. The prefetch apparatus monitors access requests, each having an access request address, and has request tracking storage to store region entries for regions of memory space which each span multiple access request addresses. The request tracking storage keeps access information for access requests received in their corresponding region entries. When a new region access request is received, which belongs to a new region for which there is no region entry, and when the request tracking storage has an adjacent region entry for which the access information shows that at least a predetermined number of the access request addresses have been accessed, a page mode region prefetching process is initiated for all access request addresses in the new region.