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

[Mathieu Desnoyers]

----- On Nov 23, 2015, at 4:46 PM, rostedt rostedt@xxxxxxxxxxx wrote:

> On Mon,  2 Nov 2015 17:42:43 -0500
> Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> 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@xxxxxxxxxxxx>
>> CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>> CC: Steven Rostedt <rostedt@xxxxxxxxxxx>
>> CC: Ingo Molnar <mingo@xxxxxxxxxx>
>> CC: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
>> ---
>>  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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