*BSD News Article 1648


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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