Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site cstvax.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!mcvax!ukc!cstvax!gdmr From: gdmr@cstvax.UUCP (George D M Ross) Newsgroups: net.arch Subject: Re: Page size and the meaning of life Message-ID: <7@cstvax.UUCP> Date: Tue, 29-Oct-85 04:53:47 EST Article-I.D.: cstvax.7 Posted: Tue Oct 29 04:53:47 1985 Date-Received: Sun, 3-Nov-85 07:25:58 EST References: <926@decwrl.UUCP> <931@lll-crg.ARpA> <7459@watdaisy.UUCP> <939@lll-crg.ARpA> <406@unc.unc.UUCP> Reply-To: gdmr@cstvax.UUCP (George D M Ross) Organization: Comp. Sc., Edinburgh Univ., Scotland Lines: 14 If the operating system allows you to modify page protection, catch access violations and define the VM-to-disc mapping on a per-page basis, all from a user program, then it is possible to do quite a nifty implementation of differential files (and such-like things). You need a reasonable page size do make it work sensibly; a {base, limit}-type segment is pretty useless from this point of view. (VMS will let you do all the necessary, BTW.) -- George D M Ross, Dept. of Computer Science, Univ. of Edinburgh Phone: +44 31-667 1081 x2730 UUCP:!ukc!cstvax!gdmr JANET: gdmr@UK.AC.ed.cstvax