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    SubjectRe: [Ksummit-2008-discuss] Delayed interrupt work, thread pools

    On Wed, 2 Jul 2008, James Bottomley wrote:
    > >
    > > I think doing a "mini scheduler" inside a workgroup thread would be a
    > > major hack. We would have to have hooks into the normal scheduler to
    > > let the mini-scheduler know something is blocking, and then have that
    > > scheduler do some work. Not to mention that we need to handle
    > > preemption.
    >
    > Not necessarly ... a simplistic round robin is fine.

    Coming from the RT world I was hoping for something that we could have
    better control of prioritizing the tasks ;-)

    >
    > The work to detect the "am I being blocked" has already been done for
    > some of the aio patches, so I'm merely suggesting another use for it.

    Hmm, I didn't realize this. I'll have to go look at that code.

    >
    > Isn't preemption an orthogonal problem ... it will surely exist even in
    > the threadpool approach?

    I was just thinking that the scheduler would need to differentiate between
    being blocked and being preempted. Seems that anytime a task would sleep
    (outside preemption) the mini-scheduler would need to schedule the next
    task.

    >
    > > Having a thread pool sounds much more reasonable and easier to
    > > implement.
    >
    > Easier to implement, yes. Easier to program, unlikely, and coming with
    > a large amount of overhead, definitely.

    Hmm, I'd argue about the "easier to program" part, but the overhead I,
    unfortunately, have to argee with you.

    >
    > > BTW, if something like this is implemented, I think that it should be a
    > > replacement for softirqs and tasklets.


    -- Steve



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