Commit 9831a90c authored Sep 19, 2019 by Jens Axboe

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>

parent a1041c27

fs/io_uring.c

+1 −1

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

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