IO-Uring Archive on lore.kernel.org
 help / color / Atom feed
From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>, io-uring@vger.kernel.org
Subject: [PATCH 8/8] io_uring: optimise io_req_find_next() fast check
Date: Tue, 30 Jun 2020 15:20:43 +0300
Message-ID: <79bf871cc697106b6f914a2c64f957a1de06e5d3.1593519186.git.asml.silence@gmail.com> (raw)
In-Reply-To: <cover.1593519186.git.asml.silence@gmail.com>

gcc 9.2.0 compiles io_req_find_next() as a separate function leaving
the first REQ_F_LINK_HEAD fast check not inlined. Help it by splitting
out the check from the function.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 fs/io_uring.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 68dcc29c5dc5..8cac266b4674 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1643,12 +1643,9 @@ static void io_fail_links(struct io_kiocb *req)
 	io_cqring_ev_posted(ctx);
 }
 
-static struct io_kiocb *io_req_find_next(struct io_kiocb *req)
+static struct io_kiocb *__io_req_find_next(struct io_kiocb *req)
 {
-	if (likely(!(req->flags & REQ_F_LINK_HEAD)))
-		return NULL;
 	req->flags &= ~REQ_F_LINK_HEAD;
-
 	if (req->flags & REQ_F_LINK_TIMEOUT)
 		io_kill_linked_timeout(req);
 
@@ -1664,6 +1661,13 @@ static struct io_kiocb *io_req_find_next(struct io_kiocb *req)
 	return NULL;
 }
 
+static struct io_kiocb *io_req_find_next(struct io_kiocb *req)
+{
+	if (likely(!(req->flags & REQ_F_LINK_HEAD)))
+		return NULL;
+	return __io_req_find_next(req);
+}
+
 static void __io_req_task_cancel(struct io_kiocb *req, int error)
 {
 	struct io_ring_ctx *ctx = req->ctx;
-- 
2.24.0


  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-30 12:20 [PATCH 0/8] iopoll and task_work fixes Pavel Begunkov
2020-06-30 12:20 ` [PATCH 1/8] io_uring: fix io_fail_links() locking Pavel Begunkov
2020-06-30 14:38   ` Jens Axboe
2020-06-30 14:45     ` Pavel Begunkov
2020-06-30 12:20 ` [PATCH 2/8] io_uring: fix commit_cqring() locking in iopoll Pavel Begunkov
2020-06-30 14:04   ` Jens Axboe
2020-06-30 14:36     ` Pavel Begunkov
2020-06-30 14:46       ` Jens Axboe
2020-06-30 15:00         ` Pavel Begunkov
2020-06-30 15:33           ` Jens Axboe
2020-06-30 12:20 ` [PATCH 3/8] io_uring: fix ignoring eventfd " Pavel Begunkov
2020-06-30 12:20 ` [PATCH 4/8] io_uring: fix missing ->mm on exit Pavel Begunkov
2020-06-30 12:20 ` [PATCH 5/8] io_uring: don't fail iopoll requeue without ->mm Pavel Begunkov
2020-06-30 12:20 ` [PATCH 6/8] io_uring: fix NULL mm in io_poll_task_func() Pavel Begunkov
2020-06-30 12:20 ` [PATCH 7/8] io_uring: simplify io_async_task_func() Pavel Begunkov
2020-06-30 12:20 ` Pavel Begunkov [this message]
2020-06-30 12:39 ` [PATCH 0/8] iopoll and task_work fixes Pavel Begunkov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=79bf871cc697106b6f914a2c64f957a1de06e5d3.1593519186.git.asml.silence@gmail.com \
    --to=asml.silence@gmail.com \
    --cc=axboe@kernel.dk \
    --cc=io-uring@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

IO-Uring Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/io-uring/0 io-uring/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 io-uring io-uring/ https://lore.kernel.org/io-uring \
		io-uring@vger.kernel.org
	public-inbox-index io-uring

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.io-uring


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git