Sorry for the duplicate reply, I forgot to CC the mailing list.

On Tue, 2019-08-27 at 09:50 -0600, Jens Axboe wrote:
> Outside of going for a cleanup, have you observed any wins from this
> change?

I haven't ran any interesting benchmarks. The cp examples in liburing
are running as fast as before, at least on x86_64.

Do you think it makes sense to tell userspace that the sq and cq mmap
offsets now mean the same thing? We could add a flag set by the kernel
to io_uring_params.