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    SubjectRe: [PATCH] io stalls
    On Thu, Jun 12, 2003 at 12:51:30PM +1000, Nick Piggin wrote:
    > I guess you could fix this by having a "last woken" flag, and
    > allow that process to allocate requests without blocking from
    > the batch limit until the queue full limit. That is how
    > batch_requests is supposed to work.

    I see what you mean, I did care about the case of each request belonging
    to a different task, but of course this doesn't work if there's just one
    task. In such case there will be a single wakeup and one for each
    request, so it won't be able to eat all the requests and it'll keep
    hanging on the full bitflag. So yes, the ->full bit partly disabled the
    batch sectors in presence of only 1 task. With multiple tasks and the
    wake_up_nr batch_sectors will still work. However I don't care about
    that right now ;), it's a minor issue I guess, single task I/O normally
    doesn't seek heavily so more likely it will run into the oversized queue
    before being able to take advantage of the batch sectors.

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