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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?)


IA64: a worthy successor to i860.

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