I converted the posix-aio support to this, and also introduced a "unix" aio which just uses O_NONBLOCK and select(). The later only supports 1 simultaneous request per-fd but currently posix-aio is limited to that too. At least with my QEMU testing, the unix aio implementation outperforms posix-aio by a factor of 2.
And it uses no signals...I'm inclined to suggest that we use signalfd with posix-aio, and for older guests, just fall back to unix aio. We can also introduce a linux-aio and use that when possible.
Regards, Anthony Liguori
qemu-block-aio-unix.patch
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