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From: kent@tifsie.UUCP (Russell Kent)
Newsgroups: comp.arch,comp.unix.wizards,comp.os.minix
Subject: Re: Free Software Foundation (was: Re: Mach, the new standard?)
Message-ID: <245@tifsie.UUCP>
Date: Tue, 29-Sep-87 21:12:29 EDT
Article-I.D.: tifsie.245
Posted: Tue Sep 29 21:12:29 1987
Date-Received: Wed, 7-Oct-87 00:40:13 EDT
References: <6476@brl-smoke.ARPA>
Organization: TI Process Automation Center, Dallas
Lines: 18
Xref: mnetor comp.arch:2484 comp.unix.wizards:4646 comp.os.minix:1783

in article <6476@brl-smoke.ARPA>, gwyn@brl-smoke.ARPA (Doug Gwyn ) says:
> Xref: tifsil comp.arch:729 comp.unix.wizards:1184 comp.os.minix:492
> 
> In article <7672@felix.UUCP> preston@felix.UUCP (Preston Bannister) writes:
>>The fork call is going to be awefully expensive, as a copy of the
>>entire data space of the parent will be made.
> 
> It need not be; don't copy the pages until a attempt to modify them occurs.

Unfortunately, the machines that MINIX currently runs on do not
have the memory management hardware to support the copy-on-write
interrupt (ala DEC VAX processors).  Nice try though :-)

-- 
Russell Kent			Phone: +1 214 995 3501
Texas Instruments - MS 3635	Net mail:
P.O. Box 655012			...!{ihnp4,uiucdcs}!convex!smu!tifsie!kent	
Dallas, TX 75265		...!ut-sally!im4u!ti-csl!tifsie!kent