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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/