From: Pavel Begunkov <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH 02/16] io_uring: add more likely/unlikely() annotations
Date: Mon, 4 Oct 2021 20:02:47 +0100 [thread overview]
Message-ID: <88e087afe657e7660194353aada9b00f11d480f9.1633373302.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
Add two extra unlikely() in io_submit_sqes() and one around
io_req_needs_clean() to help the compiler to avoid extra jumps
in hot paths.
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 970535071564..b09b267247f5 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1957,7 +1957,7 @@ static inline void io_dismantle_req(struct io_kiocb *req)
{
unsigned int flags = req->flags;
- if (io_req_needs_clean(req))
+ if (unlikely(io_req_needs_clean(req)))
io_clean_op(req);
if (!(flags & REQ_F_FIXED_FILE))
io_put_file(req->file);
@@ -7201,11 +7201,11 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr)
unsigned int entries = io_sqring_entries(ctx);
int submitted = 0;
- if (!entries)
+ if (unlikely(!entries))
return 0;
/* make sure SQ entry isn't read before tail */
nr = min3(nr, ctx->sq_entries, entries);
- if (!percpu_ref_tryget_many(&ctx->refs, nr))
+ if (unlikely(!percpu_ref_tryget_many(&ctx->refs, nr)))
return -EAGAIN;
io_get_task_refs(nr);
--
2.33.0
next prev parent reply other threads:[~2021-10-04 19:03 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-04 19:02 [PATCH 00/16] squeeze more performance Pavel Begunkov
2021-10-04 19:02 ` [PATCH 01/16] io_uring: optimise kiocb layout Pavel Begunkov
2021-10-04 19:02 ` Pavel Begunkov [this message]
2021-10-04 19:02 ` [PATCH 03/16] io_uring: delay req queueing into compl-batch list Pavel Begunkov
2021-10-04 19:02 ` [PATCH 04/16] io_uring: optimise request allocation Pavel Begunkov
2021-10-04 19:02 ` [PATCH 05/16] io_uring: optimise INIT_WQ_LIST Pavel Begunkov
2021-10-04 19:02 ` [PATCH 06/16] io_uring: don't wake sqpoll in io_cqring_ev_posted Pavel Begunkov
2021-10-04 19:02 ` [PATCH 07/16] io_uring: merge CQ and poll waitqueues Pavel Begunkov
2021-10-04 19:02 ` [PATCH 08/16] io_uring: optimise ctx referencing by requests Pavel Begunkov
2021-10-04 19:02 ` [PATCH 09/16] io_uring: mark cold functions Pavel Begunkov
2021-10-04 19:02 ` [PATCH 10/16] io_uring: optimise io_free_batch_list() Pavel Begunkov
2021-10-04 19:02 ` [PATCH 11/16] io_uring: control ->async_data with a REQ_F flag Pavel Begunkov
2021-10-04 19:02 ` [PATCH 12/16] io_uring: remove struct io_completion Pavel Begunkov
2021-10-04 19:02 ` [PATCH 13/16] io_uring: inline io_req_needs_clean() Pavel Begunkov
2021-10-04 19:02 ` [PATCH 14/16] io_uring: inline io_poll_complete Pavel Begunkov
2021-10-04 19:03 ` [PATCH 15/16] io_uring: correct fill events helpers types Pavel Begunkov
2021-10-04 19:03 ` [PATCH 16/16] io_uring: mark hot functions Pavel Begunkov
2021-10-04 20:19 ` [PATCH 00/16] squeeze more performance Jens Axboe
2021-10-04 20:33 ` Jens Axboe
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