io_uring: get rid of hashed provided buffer groups
Use a plain array for any group ID that's less than 64, and punt anything beyond that to an xarray. 64 fits in a page even for 4KB page sizes and with the planned additions. This makes the expected group usage faster by avoiding a hash and lookup to find our list, and it uses less memory upfront by not allocating any memory for provided buffers unless it's actually being used. Suggested-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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