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A Pageable Memory Based File System .AU Marshall Kirk McKusick .AU Michael J. Karels .AU Keith Bostic .AI Computer Systems Research Group Computer Science Division Department of Electrical Engineering and Computer Science University of California, Berkeley Berkeley, California 94720 email: mckusick@cs.Berkeley.EDU telephone: 415-642-4948 .AB This paper describes the motivation for a memory-based filesystem. It compares the techniques used to implement them and describes the drawbacks of using dedicated memory to support such filesystems. To avoid the drawbacks of using dedicated memory, it tells how to build a simple memory-based filesystem in pageable memory. It details the performance characteristics of this filesystem and concludes with areas for future work. .AE