From: Dave Jones <davej@redhat.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: lots of brief rcu stalls.
Date: Wed, 4 Dec 2013 20:22:06 -0500 [thread overview]
Message-ID: <20131205012206.GA31349@redhat.com> (raw)
In-Reply-To: <20131205001614.GI15492@linux.vnet.ibm.com>
On Wed, Dec 04, 2013 at 04:16:14PM -0800, Paul E. McKenney wrote:
> On Wed, Dec 04, 2013 at 06:28:38PM -0500, Dave Jones wrote:
> > 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?
>
> Does the following help?
Seems so so far!
Dave
next prev parent reply other threads:[~2013-12-05 1:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-04 23:28 lots of brief rcu stalls Dave Jones
2013-12-05 0:16 ` Paul E. McKenney
2013-12-05 1:22 ` Dave Jones [this message]
2013-12-05 2:44 ` Paul E. McKenney
2013-12-05 16:49 ` Paul E. McKenney
2013-12-05 17:15 ` Dave Jones
2013-12-05 17:31 ` Paul E. McKenney
2013-12-05 2:18 ` Eric Dumazet
2013-12-05 2:36 ` Joe Perches
2013-12-05 2:51 ` Paul E. McKenney
2013-12-05 2:43 ` Paul E. McKenney
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