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From: Miod Vallat <miod@online.fr>
To: TUHS main list <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] First Unix-like OSes not derived from AT&T code?
Date: Tue, 3 May 2022 07:40:11 +0000	[thread overview]
Message-ID: <YnDcW8aX/3WoGVDQ@tarentaine.gentiane.org> (raw)
In-Reply-To: <CAEoi9W4eD8AF=FwjMT-KPRfyYgD+qgVvE1u3sBwiovm4=1WWLg@mail.gmail.com>

> > At the end of the AOS work circa 1996, most of the kernel was 4.4,
> > except for the network stack which was 4.3-Reno, and the VM system which
> > was still 4.3 (hence no mmap).
> 
> 
> This happened outside of IBM, didn't it? What prevented the rest of the VM
> code being ported?

Most - if not all - the AOS work was done by Roger Florkowski and Mark
Dapoz, and Roger was definitely working for IBM at that time.

I think time was limiting factor, but also Roger was not really wanting
to port the Mach VM to AOS due to the RT MMU limitations - in
particular, there is no way for multiple virtual addresses to point to
the same page, so you need to keep evicting/switching mappings when you
want a page to be available to the kernel and the currently running
userland process. That was fixed in the POWER MMU.

> I vaguely remember Metaware being somewhat religiously extreme, but again
> the details are fuzzy now. Was there some kind of ecclesiastical reference
> in the man page?

I'm afraid that doesn't ring any bell.

Miod

  parent reply	other threads:[~2022-05-03  7:42 UTC|newest]

Thread overview: 79+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-01  9:30 Andrew Warkentin
2022-05-01 11:43 ` Ron Natalie
2022-05-01 11:56   ` Rob Pike
2022-05-01 14:03     ` Kenneth Goodwin
2022-05-03  4:37       ` Jim Carpenter
2022-05-01 14:09   ` Kenneth Goodwin
2022-05-01 18:08     ` ron minnich
2022-05-01 18:22       ` Charles H Sauer (he/him)
2022-05-01 19:49         ` Dan Stromberg
2022-05-01 20:37           ` Charles H Sauer (he/him)
2022-05-02  2:08       ` Kenneth Goodwin
2022-05-02  9:21         ` Dr Iain Maoileoin
2022-05-02 20:19           ` Rich Morin
2022-05-02 21:30             ` Clem Cole
2022-05-02 21:36             ` Dan Cross
2022-05-10 15:28         ` Mary Ann Horton
2022-05-10 16:08           ` Warner Losh
2022-05-10 16:40             ` Heinz Lycklama
2022-05-10 16:42             ` James Frew
2022-05-14  2:56             ` Mary Ann Horton
2022-05-10 16:59           ` Clem Cole
2022-05-10 17:18             ` Clem Cole
2022-05-10 18:05               ` Charles H Sauer (he/him)
2022-05-10 19:27                 ` Lars Brinkhoff
2022-05-10 19:08               ` Henry Bent
2022-05-10 19:33                 ` Richard Salz
2022-05-10 20:18                   ` Ronald Natalie
2022-05-11 16:20                     ` James Frew
2022-05-11 16:51                       ` Paul Winalski
2022-05-10 20:28                   ` Henry Bent
2022-05-10 20:43                   ` Warner Losh
2022-05-10 20:46                   ` Clem Cole
2022-05-11 16:44                     ` Paul Winalski
2022-05-11 17:09                       ` Clem Cole
2022-05-11 17:35                       ` Larry McVoy
2022-05-12  0:16                         ` George Michaelson
2022-05-13  2:46                         ` Adam Thornton
2022-05-15  0:48                           ` Larry McVoy
2022-05-15  5:36                             ` Adam Thornton
2022-05-15 13:37                               ` Larry McVoy
2022-05-12  5:22                       ` Warner Losh
2022-05-12 12:06                         ` Ron Natalie
2022-05-12 12:43                           ` John Cowan
2022-05-15  2:00         ` Stuart Remphrey
2022-05-02  2:42       ` Phil Budne
2022-05-02  6:46         ` Ron Natalie
2022-05-02 13:50           ` Clem Cole
2022-05-02 14:46             ` tytso
2022-05-02 15:38               ` Clem Cole
2022-05-02 20:31                 ` Warner Losh
2022-05-03  5:01                   ` tytso
2022-05-03 11:35                     ` Richard Salz
2022-05-02 23:30           ` Gregg Levine
     [not found]           ` <CAK7dMtD08weh+97mx+ncrq0cxprKgke42C0vFYNPnBkd8Fx9Sg@mail.gmail.com>
2022-05-03  7:28             ` Ronald Natalie
2022-05-02 12:59         ` Kenneth Goodwin
2022-05-02 14:13           ` Richard Salz
2022-05-02 13:14         ` tytso
2022-05-02 13:32           ` Larry McVoy
2022-05-02 13:16         ` Dan Cross
2022-05-02 14:14           ` Miod Vallat
2022-05-02 14:50             ` ron minnich
2022-05-02 16:13             ` Al Kossow
2022-05-02 18:46               ` Miod Vallat
2022-05-02 19:54               ` Chet Ramey
2022-05-02 21:17             ` Dan Cross
2022-05-02 23:49               ` George Michaelson
2022-05-03  7:22                 ` Ronald Natalie
2022-05-03  7:40               ` Miod Vallat [this message]
2022-05-03  8:03                 ` Ron Natalie
     [not found]               ` <CAEoi9W4eD8AF=FwjMT-KPRfyYgD+qgVvE1u3sBwiovm4=1WWLg@mail.g mail.com>
2022-05-03 12:14                 ` John Foust via TUHS
2022-05-01 20:55 ` Michael Huff
2022-05-03  4:55   ` Jim Carpenter
2022-05-02 15:43 ` Clem Cole
2022-05-02 16:16   ` Bakul Shah
2022-05-02 16:19     ` Bakul Shah
2022-05-02 17:14       ` Clem Cole
2022-05-02 16:29     ` Larry McVoy
2022-05-02 17:42     ` Clem Cole
2022-05-02 17:59       ` Bakul Shah

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