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* [PATCH 1/1] io_uring: place close flag changing code
@ 2020-02-01  0:58 Pavel Begunkov
  2020-02-01 16:28 ` Jens Axboe
  0 siblings, 1 reply; 2+ messages in thread
From: Pavel Begunkov @ 2020-02-01  0:58 UTC (permalink / raw)
  To: Jens Axboe, io-uring, linux-kernel

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


^ permalink raw reply related	[flat|nested] 2+ messages in thread

* Re: [PATCH 1/1] io_uring: place close flag changing code
  2020-02-01  0:58 [PATCH 1/1] io_uring: place close flag changing code Pavel Begunkov
@ 2020-02-01 16:28 ` Jens Axboe
  0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2020-02-01 16:28 UTC (permalink / raw)
  To: Pavel Begunkov, io-uring, linux-kernel

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


^ permalink raw reply	[flat|nested] 2+ messages in thread

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