io_uring: small io_submit_sqe() optimisation
submit_state.link is used only to assemble a link and not used for actual submission, so clear it before io_queue_sqe() in io_submit_sqe(), awhile it's hot and in caches and queueing doesn't spoil it. May also potentially help compiler with spilling or to do other optimisations. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/1579939426f3ad6b55af3005b1389bbbed7d780d.1623709150.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -6616,8 +6616,8 @@ fail_req:
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/* last request of a link, enqueue the link */
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if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) {
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io_queue_sqe(head);
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link->head = NULL;
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io_queue_sqe(head);
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}
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} else {
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if (unlikely(ctx->drain_next)) {
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