linux-kernel - [PATCH] kthread_worker: don't hog the cpu

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Message-ID: <5de0a179b3184e1a2183fc503448b0269f24d75b.1503697127.git.shli@fb.com>
Date:   Fri, 25 Aug 2017 14:44:50 -0700
From:   Shaohua Li <shli@...com>
To:     <linux-kernel@...r.kernel.org>
CC:     <akpm@...ux-foundation.org>, <tglx@...utronix.de>
Subject: [PATCH] kthread_worker: don't hog the cpu

If the worker thread continues getting work, it will hog the cpu and rcu
stall complains. Make it a good citizen. This is triggered in a loop
block device test.

Signed-off-by: Shaohua Li <shli@...com>
---
 kernel/kthread.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 26db528..1c19edf 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -637,6 +637,7 @@ int kthread_worker_fn(void *worker_ptr)
 		schedule();
 
 	try_to_freeze();
+	cond_resched();
 	goto repeat;
 }
 EXPORT_SYMBOL_GPL(kthread_worker_fn);
-- 
2.9.5