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From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>, io-uring@vger.kernel.org
Subject: [PATCH 4/6] io_uring: optimise hot path restricted checks
Date: Sat, 26 Jun 2021 21:40:47 +0100	[thread overview]
Message-ID: <22bf70d0a543dfc935d7276bdc73081784e30698.1624739600.git.asml.silence@gmail.com> (raw)
In-Reply-To: <cover.1624739600.git.asml.silence@gmail.com>

Move likely/unlikely from io_check_restriction() to specifically
ctx->restricted check, because doesn't do what it supposed to and make
the common path take an extra jump.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 fs/io_uring.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 953bdc41d018..4dd2213f5454 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6702,7 +6702,7 @@ static inline bool io_check_restriction(struct io_ring_ctx *ctx,
 					struct io_kiocb *req,
 					unsigned int sqe_flags)
 {
-	if (!ctx->restricted)
+	if (likely(!ctx->restricted))
 		return true;
 
 	if (!test_bit(req->opcode, ctx->restrictions.sqe_op))
@@ -6745,7 +6745,7 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
 		return -EINVAL;
 	if (unlikely(req->opcode >= IORING_OP_LAST))
 		return -EINVAL;
-	if (unlikely(!io_check_restriction(ctx, req, sqe_flags)))
+	if (!io_check_restriction(ctx, req, sqe_flags))
 		return -EACCES;
 
 	if ((sqe_flags & IOSQE_BUFFER_SELECT) &&
-- 
2.32.0


  parent reply	other threads:[~2021-06-26 20:41 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-26 20:40 [PATCH for-next 0/6] small for-next optimisations Pavel Begunkov
2021-06-26 20:40 ` [PATCH 1/6] io_uring: refactor io_arm_poll_handler() Pavel Begunkov
2021-06-26 20:40 ` [PATCH 2/6] io_uring: mainstream sqpoll task_work running Pavel Begunkov
2021-06-26 20:40 ` [PATCH 3/6] io_uring: remove not needed PF_EXITING check Pavel Begunkov
2021-06-26 20:40 ` Pavel Begunkov [this message]
2021-06-26 20:40 ` [PATCH 5/6] io_uring: refactor io_submit_flush_completions Pavel Begunkov
2021-06-26 20:40 ` [PATCH 6/6] io_uring: pre-initialise some of req fields Pavel Begunkov
2021-06-27 22:23 ` [PATCH for-next 0/6] small for-next optimisations Jens Axboe

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