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

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Message-ID: <20151123164643.04f8601d@gandalf.local.home>
Date:	Mon, 23 Nov 2015 16:46:43 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
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 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.

-- 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(-)
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