io_uring: optimise out unlikely link queue

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__io_queue_sqe() tries to issue as much requests of a link as it can,
and uses io_put_req_find_next() to extract a next one, targeting inline
completed requests. As now __io_queue_sqe() is always used together with
struct io_comp_state, it leaves next propagation only a small window and
only for async reqs, that doesn't justify its existence.

Remove it, make __io_queue_sqe() to issue only a head request. It
simplifies the code and will allow other optimisations.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2021-02-12 03:23:51 +00:00 • committed by Jens Axboe

parent bd75904590

commit d3d7298d05

1 changed files with 10 additions and 32 deletions

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fs/io_uring.c

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