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 <hdanton@sina.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io-wq.c b/fs/io-wq.c
index a1c8545..541c8a3 100644 (file)
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -429,6 +429,8 @@ next:
                if (signal_pending(current))
                        flush_signals(current);
 
+               cond_resched();
+
                spin_lock_irq(&worker->lock);
                worker->cur_work = work;
                spin_unlock_irq(&worker->lock);