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    SubjectRe: [RESEND][RFC] BFQ I/O Scheduler
    > From: Jens Axboe <jens.axboe@oracle.com>
    > Date: Tue, Apr 15, 2008 10:22:36AM +0200
    >
    > On Tue, Apr 01 2008, Fabio Checconi wrote:
    ...
    > > We would greatly appreciate any sort of feedback from you, comments,
    > > suggestions, corrections and so on. Thank you for your attention.
    >
    > Fabio, I've merged the scheduler for some testing. Overall the code
    > looks great, you've done a good job!
    >

    thank you very much :)


    > I didn't touch patches 2 and 3, but I rewrote #1 somewhat. See the
    > result here:
    >
    > http://git.kernel.dk/?p=linux-2.6-block.git;a=commitdiff;h=973a02c4ea1c324c41e45b69c074b13d3bfa97de;hp=a985aabe4d7a720b109c2b63549f8641676a9c88
    >
    > I'm sure you'll agree with the hlist_sched_*() functions. I also killed
    > the ->bfq_ioprio_changed modification, what exactly was the purpose of
    > that?
    >

    of course the hlist_sched_*() functions are much better than what was
    in the patch (the idea behind the patch was to not touch at all cfq code).

    the ->bfq_ioprio_changed was there to avoid that a process/ioc doing
    i/o on multiple devices managed by cfq and bfq would see ioprio
    changes only for one of the two schedulers.

    cfq_ioc_set_ioprio() (and its bfq counterpart bfq_ioc_set_ioprio())
    unconditionally assign 0 to (bfq_)ioprio_changed, so the first
    scheduler that sees the ioprio change eats the new priority values.
    of course I may be wrong, but I think it (or some better mechanism
    to avoid the problem) is necessary.


    > The code is now in the 'bfq' branch of the block git repo.
    >

    of course we'll be glad to help in testing in any way you can find useful.

    thank you!


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