io_uring: batch getting pcpu references
percpu_ref_tryget() has its own overhead. Instead getting a reference for each request, grab a bunch once per io_submit_sqes(). ~5% throughput boost for a "submit and wait 128 nops" benchmark. Signed-off-by:Pavel Begunkov <asml.silence@gmail.com> __io_req_free_empty() -> __io_req_do_free() Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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