Commit 5e159204 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

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: default avatarPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1579939426f3ad6b55af3005b1389bbbed7d780d.1623709150.git.asml.silence@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent f18ee4cf

fs/io_uring.c

+1 −1
Original line number Diff line number Diff line
@@ -6616,8 +6616,8 @@ static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, 


		/* last request of a link, enqueue the link */

		if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) {

			io_queue_sqe(head);

			link->head = NULL;

			io_queue_sqe(head);

		}

	} else {

		if (unlikely(ctx->drain_next)) {