From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Enrico Mioso <mrkiko.rs@gmail.com>,
linux-kernel@vger.kernel.org,
Josh Triplett <josh@joshtriplett.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: Re: INFO: rcu_sched self-detected stall on CPU
Date: Wed, 4 Jan 2017 08:17:12 -0800 [thread overview]
Message-ID: <20170104161712.GL3742@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170104091631.78af9d45@gandalf.local.home>
On Wed, Jan 04, 2017 at 09:16:31AM -0500, Steven Rostedt wrote:
> On Wed, 4 Jan 2017 05:46:08 -0800
> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
>
> > I suggest enabling tracing for timers with a goal of working out why
> > the rcu_sched task is not being awakened regularly -- during a grace
> > period, it should be awakened every three jiffies or so (depending on
> > the value of HZ).
>
> Perhaps enable events for rcu, sched and irqs as well?
Good point -- but you will need to build with CONFIG_RCU_TRACE=y
to get most of the RCU events.
Thanx, Paul
next prev parent reply other threads:[~2017-01-04 16:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-04 9:58 INFO: rcu_sched self-detected stall on CPU Enrico Mioso
2017-01-04 13:46 ` Paul E. McKenney
2017-01-04 14:16 ` Steven Rostedt
2017-01-04 15:35 ` Enrico Mioso
2017-01-04 16:17 ` Paul E. McKenney [this message]
2017-01-04 20:59 ` Enrico Mioso
2017-01-06 7:47 ` Paul E. McKenney
2017-01-05 18:32 ` Enrico Mioso
2017-01-06 7:48 ` Paul E. McKenney
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