linux-kernel - Re: INFO: rcu_sched self-detected stall on CPU

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Message-ID: <20170104091631.78af9d45@gandalf.local.home>
Date:   Wed, 4 Jan 2017 09:16:31 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     Enrico Mioso <mrkiko.rs@...il.com>, linux-kernel@...r.kernel.org,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: INFO: rcu_sched self-detected stall on CPU

On Wed, 4 Jan 2017 05:46:08 -0800
"Paul E. McKenney" <paulmck@...ux.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?

-- Steve