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>
This commit is contained in:
Jens Axboe 2019-09-19 09:48:55 -06:00
parent a1041c27b6
commit 9831a90ce6

View File

@ -2438,7 +2438,7 @@ static int io_sq_thread(void *data)
* to sleep.
*/
if (inflight || !time_after(jiffies, timeout)) {
cpu_relax();
cond_resched();
continue;
}