From 6c0002d3a2730da9dfbca0d035ddc785de38e6d2 Mon Sep 17 00:00:00 2001
From: Hillf Danton <hdanton@sina.com>
Date: Tue, 24 Dec 2019 09:14:29 -0700
Subject: [PATCH] io-wq: add cond_resched() to worker thread

to #26323578

commit fd1c4bc6e9b34a5e4fe7a3130a49380ef9d7037c upstream.

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>
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
---
 fs/io-wq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 6b41df72c93b..807ccdf46400 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -430,6 +430,8 @@ 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);
-- 
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