linux-kernel - Re: [RFC][PATCH 08/18 v2] ftrace/rcu: Do not trace debug_lockdep_rcu

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Message-ID: <1377981074.26624.0.camel@pippen.local.home>
Date:	Sat, 31 Aug 2013 16:31:14 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [RFC][PATCH 08/18 v2] ftrace/rcu: Do not trace
 debug_lockdep_rcu_enabled()

On Sat, 2013-08-31 at 12:21 -0700, Paul E. McKenney wrote:
> On Sat, Aug 31, 2013 at 01:11:25AM -0400, Steven Rostedt wrote:
> > From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> > 
> > The function debug_lockdep_rcu_enabled() is part of the RCU lockdep
> > debugging, and is called very frequently. I found that if I enable
> > a lot of debugging and run the function graph tracer, this
> > function can cause a live lock of the system.
> > 
> > We don't usually trace lockdep infrastructure, no need to trace
> > this either.
> > 
> > Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> 
> Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 
> Or I can just take it, if you would rather.  (If so, 3.12 or 3.13?)
> 

Feel free to take it and I'll remove it from my queue. 3.12 please.

I'll just need to remember to turn off function graph tracing when
testing these patches again.

-- Steve


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