From owner-freebsd-hackers Thu Jan 7 19:05:17 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id TAA19158 for freebsd-hackers-outgoing; Thu, 7 Jan 1999 19:05:17 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from apollo.backplane.com (apollo.backplane.com [209.157.86.2]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id TAA19153 for ; Thu, 7 Jan 1999 19:05:15 -0800 (PST) (envelope-from dillon@apollo.backplane.com) Received: (from dillon@localhost) by apollo.backplane.com (8.9.1/8.9.1) id TAA36826; Thu, 7 Jan 1999 19:04:44 -0800 (PST) (envelope-from dillon) Date: Thu, 7 Jan 1999 19:04:44 -0800 (PST) From: Matthew Dillon Message-Id: <199901080304.TAA36826@apollo.backplane.com> To: Terry Lambert Cc: dyson@iquest.net, pfgiffun@bachue.usc.unal.edu.co, freebsd-hackers@FreeBSD.ORG Subject: Re: questions/problems with vm_fault() in Stable Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG : :Now we deal with collapsing of layers: Anything that you can trivially collapse is a degenerate case and thus a relatively easy problem to solve no matter what design you use. Even the current design can almost handle it. Using NullFS as example is ridiculous -- NullFS is about as degenerate as case as you can get. Using it to prove a point makes no sense. Use something complex that requires cache coherency and prove your point with that - except you refuse to consider any stacking cases where cache coherency might be an issue. -Matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message