linux-kernel - Re: [PATCH 05/14] perf tools: Introduce new 'ftrace' tool

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Date:	Wed, 24 Apr 2013 16:09:18 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 05/14] perf tools: Introduce new 'ftrace' tool

On Tue, Apr 23, 2013 at 05:31:03PM +0900, Namhyung Kim wrote:
> From: Namhyung Kim <namhyung.kim@....com>
> 

SNIP

> +out:
> +	put_tracing_file(file);
> +	return ret;
> +}
> +
> +static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
> +{
> +	if (write_tracing_file("tracing_on", "0") < 0)
> +		return -1;
> +
> +	if (write_tracing_file("current_tracer", "nop") < 0)
> +		return -1;
> +
> +	if (write_tracing_file("set_ftrace_pid", " ") < 0)
> +		return -1;

I think we want to reset set_ftrace_pid file as well
probably to -1..

if I'm tracing command with this file having wrong CPU(s)
I dont get any data..

jirka
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