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    SubjectRe: [PATCH] remove useless highmem bounce from loop/cryptoloop
    On Thu, 30 Oct 2003 13:30:00 -0800, Andrew Morton wrote:
    > Ben, I confess that I'd forgotten about #1198. I'll take a look at your
    > memory allocation fix - it seems to be unfortunately large, but we may need
    > to go that way.

    The current memory allocation procedure really is inadequate. It worked
    ok up thru 2.4 because the loop device was used almost exclusively
    as a nifty hack to make an initrd or to double-check the ISO you just
    created. Throw strong crypto into the mix and it becomes reasonable to
    have your laptop mount all its filesystems and swap off of loop devices.

    > One question is: why do we go down a different code path for blockdevs
    > nowadays anyway? The handoff to the loop thread seems to work OK for
    > file-backed loop, and providing a bmap() for blockdevs is easy enough?

    The code path for file-backed loop handles one page at a time, as that's
    the limit of the FS interface. Block-backed loop devices can throw
    huge bios at their backing device with one make_request. If we could
    get both working on the same code path, would that be worth hobbling
    block-backed loop?

    --
    Ben Slusky | If you're not part of the
    sluskyb@paranoiacs.org | solution, there's good money
    sluskyb@stwing.org | to be made in prolonging the
    PGP keyID ADA44B3B | problem. www.despair.com
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