io_uring/rsrc: optimise single entry advance
Iterating within the first bvec entry should be essentially free, but we use iov_iter_advance() for that, which shows up in benchmark profiles taking up to 0.5% of CPU. Replace it with a hand coded version. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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