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    SubjectRe: [patch 1/4] prepare_to_wait/finish_wait sleep/wakeup API

    On Wed, 25 Sep 2002, Andrew Morton wrote:
    >
    > I expect a decent win would come from using this technique in
    > select/poll, but that code relies on the remains-on-the-waitqueue
    > semantics, and would need some fiddling.

    Actually, I think that select/poll is exactly the kind of thing that would
    _not_ improve noticeably, since usually it's only one (out of possibly
    hundreds) or wait-queues that gets woken up.

    So even if that one were to be made faster, the _real_ cost when it comes
    to the wait-queues will be all the other 99 waitqueues that select/poll
    has to remove itself from the old way anyway.

    Linus

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