Date: Thu, 14 Jan 1999 23:01:18 -0500 (EST) From: "John S. Dyson" <dyson@dyson.iquest.net> To: thorpej@nas.nasa.gov Cc: dyson@dyson.iquest.net, dillon@apollo.backplane.com, root@dyson.iquest.net, dg@root.com, jkh@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: Review and report of linux kernel VM Message-ID: <199901150401.XAA18990@dyson.iquest.net> In-Reply-To: <199901142323.PAA07241@lestat.nas.nasa.gov> from Jason Thorpe at "Jan 14, 99 03:23:20 pm"
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> On Thu, 14 Jan 1999 17:57:57 -0500 (EST) > "John S. Dyson" <dyson@dyson.iquest.net> wrote: > > > implementations, but also adds overhead. It would be "nice" to be able > > for the upper level VM code to simply modify page table entries sometimes, > > wouldn't it? One thing that I did in the FreeBSD code was to minimize the > > It would? What if your architecture doesn't use page tables, in the > traditional sense? (There are at least a couple modern RISC architectures > for which this is the case...) > In those cases, then they simulate the page table schemes. (I am VERY familiar with such, currently doing a port to such a machine.) However, if you look at the VM code, the issues of the layer transitions are significant. It is clear that there is *something* wrong with the place where the layering is between the upper and lower level VM code. I am not sure where to put it though. John To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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