Well, considering that the silly bug could result in request queue
corruption, I really suspect you'll be happier without it ;)
The io_request_lock wasn't held in a critical place, which would
potentially improve performance, but ...
> I'll poke at it a bit more. One perennial problem which
> we face is that there isn't, IMO, a good set of tests for tracking
> changes in thoughput. All the tools which are readily available
> are good for stress testing and silly corner cases but they
> don't seem to model real-world workloads well.
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