From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=MAILING_LIST_MULTI, UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 7780 invoked from network); 3 May 2022 07:42:35 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 3 May 2022 07:42:35 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 0C24D9D48D; Tue, 3 May 2022 17:42:32 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 3A0CD9D455; Tue, 3 May 2022 17:40:17 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 43BDA9D455; Tue, 3 May 2022 17:40:14 +1000 (AEST) Received: from smtp4-g21.free.fr (smtp4-g21.free.fr [212.27.42.4]) by minnie.tuhs.org (Postfix) with ESMTPS id 855049CE23 for ; Tue, 3 May 2022 17:40:13 +1000 (AEST) Received: from tarentaine.gentiane.org (unknown [92.171.222.154]) (Authenticated sender: miod@free.fr) by smtp4-g21.free.fr (Postfix) with ESMTPSA id AB23419F574 for ; Tue, 3 May 2022 09:40:11 +0200 (CEST) Received: from localhost (tarentaine.gentiane.org [local]) by tarentaine.gentiane.org (OpenSMTPD) with ESMTPA id a34a4287 for ; Tue, 3 May 2022 07:40:11 +0000 (GMT) Date: Tue, 3 May 2022 07:40:11 +0000 From: Miod Vallat To: TUHS main list Message-ID: References: <57977CE7-DDCC-4861-BBD2-843B9B9F51C2@ronnatalie.com> <202205020242.2422g30m074857@ultimate.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Grumpyness-Level: Low X-Quack: quack! Subject: Re: [TUHS] First Unix-like OSes not derived from AT&T code? X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" > > 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