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SubjectRe: page_launder() on 2.4.9/10 issue
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?)

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