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

Özalp Babaoglu, William Joy
1981 ACM SIGOPS Operating Systems Review  
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 pagereplacement 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
more » ... he chosen algorithms based on benchmark-driven studies and production system use.
doi:10.1145/1067627.806595 fatcat:tg76zdpgq5e55m2qqllfrt76ga