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    SubjectRe: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait
    On Tue, Feb 06 2001, Ben LaHaise wrote:
    > > > - make asynchronous io possible in the block layer. This is
    > > > impossible with the current ll_rw_block scheme and io request
    > > > plugging.
    > >
    > > why is it impossible?
    > s/impossible/unpleasant/. ll_rw_blk blocks; it should be possible to have
    > a non blocking variant that does all of the setup in the caller's context.
    > Yes, I know that we can do it with a kernel thread, but that isn't as
    > clean and it significantly penalises small ios (hint: databases issue
    > *lots* of small random ios and a good chunk of large ios).

    So make a non-blocking variant, not a big deal. Users of async I/O
    know how to deal with resource limits anyway.

    Jens Axboe

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