linux-kernel - lots of brief rcu stalls.

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Message-ID: <20131204232838.GA25592@redhat.com>
Date:	Wed, 4 Dec 2013 18:28:38 -0500
From:	Dave Jones <davej@...hat.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: lots of brief rcu stalls.

Paul,
I'm seeing this happening more and more lately...

[  771.786462] INFO: rcu_preempt detected stalls on CPUs/tasks:
[  771.786552] 	Tasks blocked on level-0 rcu_node (CPUs 0-3):
[  771.786574] 	Tasks blocked on level-0 rcu_node (CPUs 0-3):
[  771.786595] 	(detected by 0, t=6502 jiffies, g=20611, c=20610, q=0)
[  771.786620] INFO: Stall ended before state dump start
[  966.724546] INFO: rcu_preempt detected stalls on CPUs/tasks:
[  966.724854] 	Tasks blocked on level-0 rcu_node (CPUs 0-3):
[  966.724931] 	Tasks blocked on level-0 rcu_node (CPUs 0-3):
[  966.725005] 	(detected by 0, t=26007 jiffies, g=20611, c=20610, q=0)
[  966.725093] INFO: Stall ended before state dump start
[ 1161.661459] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 1161.661763] 	Tasks blocked on level-0 rcu_node (CPUs 0-3):
[ 1161.661840] 	Tasks blocked on level-0 rcu_node (CPUs 0-3):
[ 1161.661915] 	(detected by 0, t=45512 jiffies, g=20611, c=20610, q=0)
[ 1161.662001] INFO: Stall ended before state dump start
[ 1356.598205] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 1356.598513] 	Tasks blocked on level-0 rcu_node (CPUs 0-3):
[ 1356.598590] 	Tasks blocked on level-0 rcu_node (CPUs 0-3):
[ 1356.598664] 	(detected by 0, t=65017 jiffies, g=20611, c=20610, q=0)
[ 1356.598751] INFO: Stall ended before state dump start
[ 1551.536099] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 1551.536408] 	Tasks blocked on level-0 rcu_node (CPUs 0-3):
[ 1551.536485] 	Tasks blocked on level-0 rcu_node (CPUs 0-3):
[ 1551.536559] 	(detected by 0, t=84522 jiffies, g=20611, c=20610, q=0)
[ 1551.536645] INFO: Stall ended before state dump start

While it's apparently a non-problem, it's pretty noisy.
Any ideas?

	Dave

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