On 03/08/2016 06:52 PM, Sebastian Andrzej Siewior wrote:

However I don't think if your DEFER flag solution is all that bad. I
have also the block-mq in -RT using swait and they perform wakes with
irqs-off. Not in -RT but mainline. So me might need something to make it
work properly. But if we defer the wakeup they might come at us and
complain about the latency…

I intended to extend the test code to measure the latency diff as well.
Just to get a feeling how bad it is. At least with a lot of waiters on
the completion the current measurement indicate an improvement. I guess
with real workload the things look quite different.

cheers,
daniel
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