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    SubjectRe: [PATCHv4 12/14] writeback: optimize periodic bdi thread wakeups
    On Fri, 2010-07-23 at 12:28 -0400, Christoph Hellwig wrote:
    > I haven't reviewed this in detail, but what ensures the timer is
    > synchronously removed when the forker goes away?

    Good point, thanks.

    > I don't see a
    > del_timer_sync call anywhere. For now it might be easier to just
    > skip this patch and leave it for later.

    Well, my tests showed that with this patch the flushers wake up
    considerably less. So I'll try to come up with a better patch.

    I will set-up better testing. Will hack things so that the background
    dirty writeout timeout is something like 1-3 jiffies and the bdi thread
    inactive timeout is something like 3-5 jiffies. Then will write a script
    which forks many tasks each of each creates a loop-back device, mounts
    it, does some I/O, unmounts, removes the loop-back device, and so on. If
    run for long time, it should give good stress to the code paths I'm
    working on. I have a 2-way 4-core (total 8) amd64 testbox to test.

    Best Regards,
    Artem Bityutskiy (Артём Битюцкий)

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