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io_uring: optimise rw comletion handlers

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Don't override req->result in io_complete_rw_iopoll() when it's already
of the same value, we have an if just above it, so move the assignment
there. Also, add one simle unlikely() in __io_complete_rw_common().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/8dfeb4f84026a20172bcf82c05010abe955874ae.1634144845.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-10-14 16:10:14 +01:00 committed by Jens Axboe
parent f80a50a632
commit 258f3a7f84
1 changed files with 2 additions and 2 deletions
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4
fs/io_uring.c
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@ -2640,7 +2640,7 @@ static bool __io_complete_rw_common(struct io_kiocb *req, long res)
{
if (req->rw.kiocb.ki_flags & IOCB_WRITE)
kiocb_end_write(req);
if (res != req->result) {
if (unlikely(res != req->result)) {
if ((res == -EAGAIN || res == -EOPNOTSUPP) &&
io_rw_should_reissue(req)) {
req->flags |= REQ_F_REISSUE;
@ -2695,9 +2695,9 @@ static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2)
req->flags |= REQ_F_REISSUE;
return;
}
req->result = res;
}
req->result = res;
/* order with io_iopoll_complete() checking ->iopoll_completed */
smp_store_release(&req->iopoll_completed, 1);
}