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From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>, io-uring@vger.kernel.org
Subject: [PATCH v2 01/24] io_uring: mark having different creds unlikely
Date: Fri, 24 Sep 2021 21:59:41 +0100	[thread overview]
Message-ID: <e7815251ac4bf5a4a23d298c752f029ae19f3837.1632516769.git.asml.silence@gmail.com> (raw)
In-Reply-To: <cover.1632516769.git.asml.silence@gmail.com>

Hint the compiler that it's not as likely to have creds different from
current attached to a request. The current code generation is far from
ideal, hopefully it can help to some compilers to remove duplicated jump
tables and so.

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

diff --git a/fs/io_uring.c b/fs/io_uring.c
index ad71c7ef7f6d..9e269fff3bbe 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6645,7 +6645,7 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
 	const struct cred *creds = NULL;
 	int ret;
 
-	if ((req->flags & REQ_F_CREDS) && req->creds != current_cred())
+	if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred()))
 		creds = override_creds(req->creds);
 
 	switch (req->opcode) {
-- 
2.33.0


  reply	other threads:[~2021-09-24 21:00 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-24 20:59 [PATCH v2 00/24] rework and optimise submission+completion paths Pavel Begunkov
2021-09-24 20:59 ` Pavel Begunkov [this message]
2021-09-24 20:59 ` [PATCH v2 02/24] io_uring: force_nonspin Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 03/24] io_uring: make io_do_iopoll return number of reqs Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 04/24] io_uring: use slist for completion batching Pavel Begunkov
2021-09-26  6:57   ` Hao Xu
2021-09-28  9:41     ` Pavel Begunkov
2021-09-28 15:32       ` Jens Axboe
2021-09-24 20:59 ` [PATCH v2 05/24] io_uring: remove allocation cache array Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 06/24] io-wq: add io_wq_work_node based stack Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 07/24] io_uring: replace list with stack for req caches Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 08/24] io_uring: split iopoll loop Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 09/24] io_uring: use single linked list for iopoll Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 10/24] io_uring: add a helper for batch free Pavel Begunkov
2021-09-26  3:36   ` Hao Xu
2021-09-28  9:33     ` Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 11/24] io_uring: convert iopoll_completed to store_release Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 12/24] io_uring: optimise batch completion Pavel Begunkov
     [not found]   ` <CAFUsyfLSXMvd_MBAp83qriW7LD=bg2=25TC4e_X4oMO1atoPYg@mail.gmail.com>
2021-09-28  9:35     ` Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 13/24] io_uring: inline completion batching helpers Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 14/24] io_uring: don't pass tail into io_free_batch_list Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 15/24] io_uring: don't pass state to io_submit_state_end Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 16/24] io_uring: deduplicate io_queue_sqe() call sites Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 17/24] io_uring: remove drain_active check from hot path Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 18/24] io_uring: split slow path from io_queue_sqe Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 19/24] io_uring: inline hot path of __io_queue_sqe() Pavel Begunkov
2021-09-24 21:00 ` [PATCH v2 20/24] io_uring: reshuffle queue_sqe completion handling Pavel Begunkov
2021-09-24 21:00 ` [PATCH v2 21/24] io_uring: restructure submit sqes to_submit checks Pavel Begunkov
2021-09-24 21:00 ` [PATCH v2 22/24] io_uring: kill off ->inflight_entry field Pavel Begunkov
2021-09-24 21:00 ` [PATCH v2 23/24] io_uring: comment why inline complete calls io_clean_op() Pavel Begunkov
2021-09-24 21:00 ` [PATCH v2 24/24] io_uring: disable draining earlier Pavel Begunkov
2021-09-30 16:04 ` [PATCH v2 00/24] rework and optimise submission+completion paths Jens Axboe

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