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    SubjectRe: [PATCH 0/11] Per-bdi writeback flusher threads v9
    ext Jens Axboe wrote:
    > On Fri, May 29 2009, Artem Bityutskiy wrote:
    >> Artem Bityutskiy wrote:
    >>> Jens Axboe wrote:
    >>>> Hi,
    >>>>
    >>>> Here's the 9th version of the writeback patches. Changes since v8:
    >>>>
    >>>> - Fix a bdi_work on-stack allocation hang. I hope this fixes Ted's
    >>>> issue.
    >>>> - Get rid of the explicit wait queues, we can just use wake_up_process()
    >>>> since it's just for that one task.
    >>>> - Add separate "sync_supers" thread that makes sure that the dirty
    >>>> super blocks get written. We cannot safely do this from
    >>>> bdi_forker_task(),
    >>>> as that risks deadlocking on ->s_umount. Artem, I implemented this
    >>>> by doing the wake ups from a timer so that it would be easier for you
    >>>> to just deactivate the timer when there are no super blocks.
    >>>>
    >>>> For ease of patching, I've put the full diff here:
    >>>>
    >>>> http://kernel.dk/writeback-v9.patch
    >>>>
    >>>> and also stored this in a writeback-v9 branch that will not change,
    >>>> you can pull that into Linus tree from here:
    >>>>
    >>>> git://git.kernel.dk/linux-2.6-block.git writeback-v9
    >>> I'm working with the above branch. Got the following twice.
    >>> Not sure what triggers this, probably if I do nothing and
    >>> cpufreq starts doing its magic, this is triggered.
    >>>
    >>> And I'm not sure it has something to do with your changes,
    >>> it is just that I saw this only with your tree. Please,
    >>> ignore if this is not relevant.
    >> Sorry, probably I shouldn't have reported this before looking
    >> closer. I'll investigate this later and fine out whether it
    >> is related to your work or not. Sorry for too early and probably
    >> false alarm.
    >
    > No problem. If it does turn out to have some relation to the writeback
    > stuff, let me know.

    OK, I'm confirming that I observe this also with pure 2.6.30-rc7
    as well.


    --
    Best Regards,
    Artem Bityutskiy (Артём Битюцкий)
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