Return to BSD News archive
Xref: sserve comp.unix.bsd:1681 comp.unix.wizards:26021 comp.unix.questions:23750 Path: sserve!manuel!munnari.oz.au!samsung!uakari.primate.wisc.edu!sdd.hp.com!cs.utexas.edu!news From: yau@cs.utexas.edu (King-Yeung Yau) Newsgroups: comp.unix.bsd,comp.unix.wizards,comp.unix.questions Subject: 4.3bsd Usrptmap Message-ID: <l4et57INN34i@ack.cs.utexas.edu> Date: 23 Jun 92 18:59:51 GMT Organization: CS Dept, University of Texas at Austin Lines: 12 NNTP-Posting-Host: ack.cs.utexas.edu Hi, In 4.3BSD Unix, there is a data structure called Usrptmap, which is in addition to the user page tables. I don't quite understand the purpose of this data structure. Why isn't it sufficient to allocate only User page tables in kernel virtual address space using a resource map? Any enlightenment on this is greatly appreciated. David Department of Computer Sciences University of Texas at Austin