linux-kernel - Re: [PATCH] ftrace: tracing

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Message-ID: <1313168788.18583.342.camel@gandalf.stny.rr.com>
Date:	Fri, 12 Aug 2011 13:06:28 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Geunsik Lim <leemgs1@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] ftrace: tracing_on to start/stop tracing

On Fri, 2011-08-12 at 14:30 +0900, Geunsik Lim wrote:
> From: Geunsik Lim <geunsik.lim@...sung.com>
> 
> tracing_enabled option is deprecated.
> To start/stop tracing, write to /sys/kernel/debug/tracing/tracing_on
> without tracing_enabled. This patch is based on Linux 3.1.0-rc1
> 

Ug, I thought I fixed this. OK, thanks. Maybe we can add this to 3.1, as
it is a very low risk patch and fixes something that can confuse people.

-- Steve

> Signed-off-by: Geunsik Lim <geunsik.lim@...sung.com>
> ---
>  kernel/trace/trace.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index e5df02c..91abdbf 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -2710,9 +2710,9 @@ static const char readme_msg[] =
>  	"# cat /sys/kernel/debug/tracing/trace_options\n"
>  	"noprint-parent nosym-offset nosym-addr noverbose\n"
>  	"# echo print-parent > /sys/kernel/debug/tracing/trace_options\n"
> -	"# echo 1 > /sys/kernel/debug/tracing/tracing_enabled\n"
> +	"# echo 1 > /sys/kernel/debug/tracing/tracing_on\n"
>  	"# cat /sys/kernel/debug/tracing/trace > /tmp/trace.txt\n"
> -	"# echo 0 > /sys/kernel/debug/tracing/tracing_enabled\n"
> +	"# echo 0 > /sys/kernel/debug/tracing/tracing_on\n"
>  ;
>  
>  static ssize_t


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