Date: Thu, 14 Jan 1999 20:31:25 -0800 From: Jason Thorpe <thorpej@nas.nasa.gov> To: "John S. Dyson" <dyson@dyson.iquest.net> Cc: 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: <199901150431.UAA08107@lestat.nas.nasa.gov>
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On Thu, 14 Jan 1999 23:01:18 -0500 (EST) "John S. Dyson" <dyson@dyson.iquest.net> wrote: > In those cases, then they simulate the page table schemes. (I am > VERY familiar with such, currently doing a port to such a machine.) Ewww, yuck! :-) Anyhow, the copying of PTEs or whatever is precisely what pmap_copy() is for, anyhow... and... > However, if you look at the VM code, the issues of the layer transitions > are significant. ...on these fancy RISC systems, the function calls are amazingly efficient because the architecture doesn't suck nearly as bad as the x86 :-) > 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. Hm, why not spell out all the things that are wrong with it? Specifics, John, specifics. And, also, please use sentences that make sense :-) "...the place where the layering is between the upper and lower level..."? Jason R. Thorpe thorpej@nas.nasa.gov NASA Ames Research Center Home: +1 408 866 1912 NAS: M/S 258-5 Work: +1 650 604 0935 Moffett Field, CA 94035 Pager: +1 650 940 5942 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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