|CSL-91-7_Virtual_Memory_Replacement_Using_Historical_Information_on_Virtual_Objects.pdf|| Vi rtual Memory Replacement
. Using Historical Information
on Vi rtual Objects
Virtual Memory Replacement Using Historical
Information on Virtual Objects
Robert B. Hagmann
Xerox Palo Alto Research Center
CSl- 91-7 September 1991 [P91 - 00094]
(!) Copyright 1991 Xerox Corporation. All rights reserved.
Abstract: Most current virtual memory systems retain very little information about
page usage. Typically, only a single bit of history is used. The history is usually only
kept on pages currently resident in physical memory. With larger main memories,
changes in applications, and the increases in file system caching in memory, these
design decisions should be reviewed. If mUltiple bits of history are kept on virtual
objects, whether they are memory resident or not, then there is the potential to
improve memory replacement performance.
This paper describes a measurement technique that is used to monitor memory usage.
It then proposes a new virtual memory replacement|