Recent changes (master)

[Jens Axboe <axboe@xxxxxxxxx>]

The following changes since commit b19c5ee1357ffb74f4de57b1617364bbbaacf1a0:

  examples: uring-cmd-zoned: expand the reasoning behind QD1 (2022-10-07 09:50:37 -0400)

are available in the Git repository at:

  git://git.kernel.dk/fio.git master

for you to fetch changes up to 07f78c37833730594778fb5684ac6ec40d0289f8:

  engines/io_uring: set coop taskrun, single issuer and defer taskrun (2022-10-12 07:19:35 -0600)

----------------------------------------------------------------
Ankit Kumar (1):
      engines/io_uring: set coop taskrun, single issuer and defer taskrun

 engines/io_uring.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

---

Diff of recent changes:

diff --git a/engines/io_uring.c b/engines/io_uring.c
index c679177f..6906e0a4 100644
--- a/engines/io_uring.c
+++ b/engines/io_uring.c
@@ -889,9 +889,30 @@ static int fio_ioring_cmd_queue_init(struct thread_data *td)
 	p.flags |= IORING_SETUP_CQSIZE;
 	p.cq_entries = depth;
 
+	/*
+	 * Setup COOP_TASKRUN as we don't need to get IPI interrupted for
+	 * completing IO operations.
+	 */
+	p.flags |= IORING_SETUP_COOP_TASKRUN;
+
+	/*
+	 * io_uring is always a single issuer, and we can defer task_work
+	 * runs until we reap events.
+	 */
+	p.flags |= IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_DEFER_TASKRUN;
+
 retry:
 	ret = syscall(__NR_io_uring_setup, depth, &p);
 	if (ret < 0) {
+		if (errno == EINVAL && p.flags & IORING_SETUP_DEFER_TASKRUN) {
+			p.flags &= ~IORING_SETUP_DEFER_TASKRUN;
+			p.flags &= ~IORING_SETUP_SINGLE_ISSUER;
+			goto retry;
+		}
+		if (errno == EINVAL && p.flags & IORING_SETUP_COOP_TASKRUN) {
+			p.flags &= ~IORING_SETUP_COOP_TASKRUN;
+			goto retry;
+		}
 		if (errno == EINVAL && p.flags & IORING_SETUP_CQSIZE) {
 			p.flags &= ~IORING_SETUP_CQSIZE;
 			goto retry;