linux-kernel - Re: High context switch rate, ksoftirqd's chewing cpu

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Message-ID: <20121130225545.GC6021@htj.dyndns.org>
Date:	Fri, 30 Nov 2012 14:55:45 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Zlatko Calusic <zlatko.calusic@...on.hr>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: High context switch rate, ksoftirqd's chewing cpu

Hello, again.

Can you please try this patch?  Thanks!

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 042d221..26368ef 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1477,7 +1477,10 @@ bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
 	} while (unlikely(ret == -EAGAIN));
 
 	if (likely(ret >= 0)) {
-		__queue_delayed_work(cpu, wq, dwork, delay);
+		if (!delay)
+			__queue_work(cpu, wq, &dwork->work);
+		else
+			__queue_delayed_work(cpu, wq, dwork, delay);
 		local_irq_restore(flags);
 	}
 
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