io_uring: use cond_resched() in sqthread
If preempt isn't enabled in the kernel, we can run into hang issues with
sqthread submissions. Use cond_resched() to play nice instead of
cpu_relax(), if we end up starting the loop and not having any events
pending for submissions.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 854dedd..05a299e 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2438,7 +2438,7 @@ static int io_sq_thread(void *data)
* to sleep.
*/
if (inflight || !time_after(jiffies, timeout)) {
- cpu_relax();
+ cond_resched();
continue;
}