Converting a swap-based system to do paging in an architecture lacking page-referenced bits

  • Authors:
  • Özalp Babaoglu;William Joy

  • Affiliations:
  • Department of Computer Science, Cornell University, Ithaca, New York;Computer Science Division, Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, Berkeley, California

  • Venue:
  • SOSP '81 Proceedings of the eighth ACM symposium on Operating systems principles
  • Year:
  • 1981

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Abstract

This paper discusses the modifications made to the UNIX operating system for the VAX-11/780 to convert it from a swap-based segmented system to a paging-based virtual memory system. Of particular interest is that the host machine architecture does not include page-referenced bits. We discuss considerations in the design of page-replacement and load-control policies for such an architecture, and outline current work in modeling the policies employed by the system. We describe our experience with the chosen algorithms based on benchmark-driven studies and production system use.