linux-kernel - Re: [PATCH 2/3] ftrace: add ftrace-buffer option

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Date:	Tue, 24 Nov 2015 12:50:04 +0000 (UTC)
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 2/3] ftrace: add ftrace-buffer option

----- On Nov 23, 2015, at 4:46 PM, rostedt rostedt@...dmis.org wrote:

> On Mon,  2 Nov 2015 17:42:43 -0500
> Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:
> 
>> In order to use ftrace tracers to generate tracepoints without doing
>> tracing to its own hardcoded ring buffers, add a ftrace-buffer option
>> (default: 1). When set to 0, it disables tracing into the ftrace
>> hardcoded buffers.
>> 
> 
> This should be a tracer specific option. And it shouldn't be called
> "ftrace-buffer" as that is a very confusing name.
> 
> Perhaps I can add an option that will prevent the snapshots as well.
> Perhaps an option called "quiet", and a "no_snapshot" one too. I can
> create the no snapshot one. But this should be converted to "quiet" and
> added as a tracer specific option.

Sure, I can add the "quiet" option to the irqsoff/irqspreemptoff
tracers if that's the route you recommend,

Thanks!

Mathieu

> 
> -- Steve
> 
> 
>> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
>> CC: Thomas Gleixner <tglx@...utronix.de>
>> CC: Steven Rostedt <rostedt@...dmis.org>
>> CC: Ingo Molnar <mingo@...hat.com>
>> CC: Peter Zijlstra <peterz@...radead.org>
>> ---
>>  kernel/trace/trace.c         |  4 +++-
>>  kernel/trace/trace.h         |  1 +
>>  kernel/trace/trace_irqsoff.c | 19 +++++++++++--------
> >  3 files changed, 15 insertions(+), 9 deletions(-)

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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