Date: Mon, 23 Nov 1998 22:28:58 -0500 (EST) From: Luoqi Chen <luoqi@watermarkgroup.com> To: cnielsen@pobox.com, freebsd-hackers@FreeBSD.ORG Subject: Re: Kernel threads Message-ID: <199811240328.WAA26688@lor.watermarkgroup.com>
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> On Mon, 23 Nov 1998, Terry Lambert wrote: > > > it again (no, this code won't run in an unmodified FreeBSD because > > of the VFS stacking problems FreeBSD has). It starts the helper > > Is the VFS stacking problem a result of the new VM implementation? What > needs to be done to fix it? I'm curious because I was looking into writing > an encrypting VFS layer, but I decided it was biting off more than I could > chew when I discovered the VFS stacking problems. > We need a cache manager (as described in Heidemann's paper) to ensure coherence between vm objects hanging off vnodes from upper and lower layer. For a transparent layer (no data translation, such as null/union/umap), maybe we could do without the cache manager by implementing vm object sharing between upper and lower vnodes. But for a data translation layer, a cache manager is definitely required. -lq > -- > Christopher Nielsen > Scient: The eBusiness Systems Innovator > <http://www.scient.com>; > cnielsen@scient.com > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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