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    SubjectRe: Linux 2.6.17-rc2
    On Wed, Apr 19 2006, Linus Torvalds wrote:
    > There are some other buffer management system calls that I haven't done
    > yet (and when I say "I haven't done yet", I obviously mean "that I hope
    > some other sucker will do for me, since I'm lazy"), but that are obvious
    > future extensions:

    Well it's worked so far, hasn't it? :-)

    > - an ioctl/fcntl to set the maximum size of the buffer. Right now it's
    > hardcoded to 16 "buffer entries" (which in turn are normally limited to
    > one page each, although there's nothing that _requires_ that a buffer
    > entry always be a page).

    This is on a TODO, but not very high up since I've yet to see a case
    where the current 16 page limitation is an issue. I'm sure something
    will come up eventually, but until then I'd rather not bother.

    > - vmsplice() system call to basically do a "write to the buffer", but
    > using the reference counting and VM traversal to actually fill the
    > buffer. This means that the user needs to be careful not to re-use the
    > user-space buffer it spliced into the kernel-space one (contrast this
    > to "write()", which copies the actual data, and you can thus re-use the
    > buffer immediately after a successful write), but that is often easy to
    > do.

    This I already did, it was pretty easy and straight forward. I'll post
    it soonish.

    --
    Jens Axboe

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