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    SubjectRe: page_launder() on 2.4.9/10 issue
    Date
    On September 6, 2001 06:57 pm, Rik van Riel wrote:
    > 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" ?

    Idle = not doing anything. IO queue is empty.

    > 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 ?

    Which two readahead requests? It's idle.

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

    See above definition of idle.

    > 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?)

    --
    Daniel
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