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    SubjectRe: page_launder() on 2.4.9/10 issue
    On Thu, 6 Sep 2001, Daniel Phillips wrote:

    > Err, not quite the whole story. It is *never* right to leave the disk
    > sitting idle while there are dirty, writable IO buffers.

    Define "idle" ?

    Is idle the time it takes between two readahead requests
    to be issued, delaying the second request because you
    just moved the disk arm away ?

    Is idle when we haven't had a request for, say, 3 disk
    seek time periods ?

    Is idle when we won't be getting any request soon for the
    area where the disk arm is hanging out ? (and how do we
    know the future?)


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