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    SubjectRe: [RFC PATCH 0/6] Convert all tasklets to workqueues

    > again, there is no reason why this couldnt be done in a hardirq context.
    > If a hardirq preempts another hardirq and the first hardirq already
    > processes the 'softnet work', you dont do it from the second one but
    > queue it with the first one. (into the already existing
    > sd->completion_queue for tx work or queue->poll_list for rx work) It
    > would be a simple additional flag in softnet_data.

    This is kind of obvious. It is just description of softnet.

    > once we forget about 'hardirq contexts run with irqs disabled', _there
    > is just no technological point for softirqs_. They are an unnecessary
    > abstraction!

    The first paragraph describes softirq, nothing else.

    I have already understood when you say "technological",
    you mean "terminological". "softirq" is just a term to describe
    "softnet" workflow in an intelligible way. Call it from inside
    irq handler, rather than in irq_exit, this changes _NOTHING_.

    I understood that you describe original pre-historic
    softnet model. You just want to replace softirq run at irq_exit
    with an explicit soft{net,scsi,whatever}_call, which could
    execute immediately or can be queued for later. I hope I am wrong,
    because this is... mmm... not a progress.

    > -rt, local_bh_disable() is a NOP there. How is it done?
    > Are we talking about the very same thing perhaps, just from a different
    > angle? ;-)

    When talking about softnet, yes.

    No, when talking about "implementing non-reentrancy via another,
    more flexible mechanism". We are not on the same page.
    I am afraid even the books are different. :-)

    I need to think about this and really read -rt code, this sounds so crazy
    that it can be even correct.

    Timeout, we are far out of topic anyway.

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      Last update: 2007-06-29 17:29    [W:0.024 / U:1.304 seconds]
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