Pavel Begunkov 24369c2e3b
io_uring: add io-wq workqueue sharing ...
If IORING_SETUP_ATTACH_WQ is set, it expects wq_fd in io_uring_params to
be a valid io_uring fd io-wq of which will be shared with the newly
created io_uring instance. If the flag is set but it can't share io-wq,
it fails.
This allows creation of "sibling" io_urings, where we prefer to keep the
SQ/CQ private, but want to share the async backend to minimize the amount
of overhead associated with having multiple rings that belong to the same
backend.
Reported-by: Jens Axboe <axboe@kernel.dk >
Reported-by: Daurnimator <quae@daurnimator.com >
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com >
Signed-off-by: Jens Axboe <axboe@kernel.dk >
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