From owner-freebsd-fs Sat Jun 9 9:51:54 2001 Delivered-To: freebsd-fs@freebsd.org Received: from earth.backplane.com (earth-nat-cw.backplane.com [208.161.114.67]) by hub.freebsd.org (Postfix) with ESMTP id B258537B401; Sat, 9 Jun 2001 09:51:50 -0700 (PDT) (envelope-from dillon@earth.backplane.com) Received: (from dillon@localhost) by earth.backplane.com (8.11.3/8.11.2) id f59GpgF07875; Sat, 9 Jun 2001 09:51:42 -0700 (PDT) (envelope-from dillon) Date: Sat, 9 Jun 2001 09:51:42 -0700 (PDT) From: Matt Dillon Message-Id: <200106091651.f59GpgF07875@earth.backplane.com> To: Alfred Perlstein Cc: Peter Wemm , tlambert2@mindspring.com, "Patrick W. Penzias Dirks" , FreeBSD-FS@FreeBSD.ORG, FreeBSD-Arch@FreeBSD.ORG Subject: Re: Support for pivot_root-like system call? References: <3B2096AB.309B2D14@mindspring.com> <20010608153011.D7AF1380C@overcee.netplex.com.au> <20010608130128.E1832@superconductor.rush.net> Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org :The cache coherency bugs are not fixed for all cases, being able to :ask the underlying filesystem for the vm_object does not solve the :problem. : :What if i have a stacking layer where each page alternates :between two files that i'm stacked on top of? : :Passing the vm_object back doesn't work for this. Unless something :else has been done. : :-Alfred Perlstein [alfred@freebsd.org] Well, I suppose a vm_map would solve this, though for the specific alternating case (or a RAID configuration of some sort) it would be really expensive to do with a vm_map. We would need some kind of synthesized translation capability in the vm_map to make it efficient. -Matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message