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From: ron@topaz.rutgers.edu (Ron Natalie)
Newsgroups: comp.arch,comp.unix.wizards,comp.os.minix
Subject: Re: Free Software Foundation (was: Re: Mach, the new standard?)
Message-ID: <15124@topaz.rutgers.edu>
Date: Mon, 28-Sep-87 21:23:43 EDT
Article-I.D.: topaz.15124
Posted: Mon Sep 28 21:23:43 1987
Date-Received: Wed, 30-Sep-87 01:34:40 EDT
References: <8490@think.UUCP> <1745@ncr-sd.SanDiego.NCR.COM> <819@sugar.UUCP> <3919@ihlpg.ATT.COM>
Organization: Rutgers Univ., New Brunswick, N.J.
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Actually, the PDP-11 has a perfectly good interrupt for bringing in
pages.  UNIX uses it to know when to grow the stack.  The problem is
that there are only eight (or 16 segments) to memory, so paging doesn't
get you a whole lot.  In addition, the shell, does user mode page faults
to know when to grow its heap.

-Ron