[openbeos] Re: High speed BMessages via S-COW
- From: "Michael Phipps" <mphipps1@xxxxxxxxxxxxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Thu, 06 Dec 2001 21:42:54 -0500
>
>Hey Michael,
>
>Thanks for the article,
>
>Correct me if I'm wrong, but I was under the impression that trips to
>kernel land were not expensive within the BeOS, since the kernel area
>was mapped into the lower portion of every process's memory area, and
>therefore trips to kernel land do not require a context switch but
>merely a switch in and out of x86 protected mode. . .
Trips to kernel land cost. Cheaper or more expensive, they still cost. I don't
know
what they will finally end up costing, when we are done. If I can eliminate
one, all
the better. :-)
>Also your article kinda reminded me of the following link about
>freebsd's copy on write implementation, if you haven't seen it before
>you'll probably find it interesting:
>http://www.daemonnews.org/200001/freebsd_vm.html
Very interesting article. Thanks for a good read.
>Cheers,
>-Steffen
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