linux-kernel - Re: FTRACE: regression in 31-rc7

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Message-ID: <alpine.DEB.2.00.0908271258250.29943@gandalf.stny.rr.com>
Date:	Thu, 27 Aug 2009 13:01:08 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Gregory Haskins <gregory.haskins@...il.com>
cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: FTRACE: regression in 31-rc7


On Thu, 27 Aug 2009, Gregory Haskins wrote:

> Hi Steve,
> 
> I just moved from -rc6 to -rc7, and I noticed that the function-graph
> tracer suddenly stopped working properly:  I do not see any output from
> seeming most things except a handful of interrupt related events.  I
> currently believe it may be an issue with tracing modules.
> 
> I haven't had a chance to bisect yet, but I did confirm that reverting
> the -rc7 merge restores the previous tracer behavior.  Any help/pointers
> appreciated.

First the stupid questions ;-)

Is anything set in the filter files?

set_ftrace_filter, set_ftrace_notrace, or set_graph_function.

Make sure all functions are seen in available_filter_functions.

Do you see any error messages?

Could you send me some output and more details.

Thanks,

-- Steve

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