io-wq: add cond_resched() to worker thread

Reschedule the current IO worker to cut the risk that it is becoming
a cpu hog.

Signed-off-by: Hillf Danton <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

Author: Hillf Danton

fs/io-wq.c

@@ -429,6 +429,8 @@ static void io_worker_handle_work(struct io_worker *worker)
 		if (signal_pending(current))
 			flush_signals(current);
 
+		cond_resched();
+
 		spin_lock_irq(&worker->lock);
 		worker->cur_work = work;
 		spin_unlock_irq(&worker->lock);