linux-kernel - Re: [PATCH] doc: clarify that trace_events= takes a comma-separated list

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Date:	Mon, 23 May 2016 16:25:44 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	Jonathan Corbet <corbet@....net>,
	Li Zefan <lizf@...fujitsu.com>
Subject: Re: [PATCH] doc: clarify that trace_events= takes a comma-separated
 list

On Mon, 23 May 2016 13:08:31 -0700
Brian Norris <computersforpeace@...il.com> wrote:


Hi Brian,

> It took me browsing through the source code to determine that I was,
> indeed, using the wrong delimiter in my command lines. So I might as
> well document it for the next person.
> 
> Signed-off-by: Brian Norris <computersforpeace@...il.com>
> ---
>  Documentation/kernel-parameters.txt | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 5349363b603c..594bf50b8f81 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -3994,7 +3994,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>  
>  	trace_event=[event-list]
>  			[FTRACE] Set and start specified trace events in order
> -			to facilitate early boot debugging.
> +			to facilitate early boot debugging. The event-list is a
> +			comma separated list of trace events to enable, as if
> +			you were to append the event(s) to
> +
> +			    /sys/kernel/debug/tracing/set_event
> +

I agree that we should document that the list is comma separated, but
the wording you have above, makes it sound like the set_event file
also takes a comma separated list, which it does not. That file
requires a space separated list.

Can you reword that so that it removes the confusion. Thanks!

-- Steve


>  			See also Documentation/trace/events.txt
>  
>  	trace_options=[option-list]