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io_uring: small io_submit_sqe() optimisation

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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>
This commit is contained in:
Pavel Begunkov 2021-06-14 23:37:26 +01:00 committed by Jens Axboe
parent f18ee4cf0a
commit 5e159204d7
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -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)) {