2020-02-01 01:02:32

by Pavel Begunkov

Subject: [PATCH 1/1] io_uring: place close flag changing code

Both iocb_flags() and kiocb_set_rw_flags() are inline and modify
kiocb->ki_flags. Place them close, so they can be potentially better
optimised.

Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 73a6c6a4ec50..c3687bda92d0 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1865,8 +1865,11 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
req->flags |= REQ_F_CUR_POS;
kiocb->ki_pos = req->file->f_pos;
}
- kiocb->ki_flags = iocb_flags(kiocb->ki_filp);
kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp));
+ kiocb->ki_flags = iocb_flags(kiocb->ki_filp);
+ ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags));
+ if (unlikely(ret))
+ return ret;

ioprio = READ_ONCE(sqe->ioprio);
if (ioprio) {
@@ -1878,10 +1881,6 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
} else
kiocb->ki_ioprio = get_current_ioprio();

- ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags));
- if (unlikely(ret))
- return ret;
-
/* don't allow async punt if RWF_NOWAIT was requested */
if ((kiocb->ki_flags & IOCB_NOWAIT) ||
(req->file->f_flags & O_NONBLOCK))
--
2.24.0

2020-02-01 16:30:45

by Jens Axboe

Subject: Re: [PATCH 1/1] io_uring: place close flag changing code

On 1/31/20 5:58 PM, Pavel Begunkov wrote:
> Both iocb_flags() and kiocb_set_rw_flags() are inline and modify
> kiocb->ki_flags. Place them close, so they can be potentially better
> optimised.

Applied, thanks.

--
Jens Axboe