linux-kernel - Re: [PATCH 1/4] tracing: Add creation of instances at boot command line

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Message-ID: <50a3b4ab-781a-e37f-49ad-cb4bbfcb4eac@infradead.org>
Date:   Wed, 11 Jan 2023 08:33:33 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ross Zwisler <zwisler@...gle.com>
Subject: Re: [PATCH 1/4] tracing: Add creation of instances at boot command
 line



On 1/11/23 06:56, Steven Rostedt wrote:
> From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> 
> Add kernel command line to add tracing instances. This only creates
> instances at boot but still does not enable any events to them. Later
> changes will extend this command line to add enabling of events, filters,
> and triggers. As well as possibly redirecting trace_printk()!
> 
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
>  .../admin-guide/kernel-parameters.txt         |  6 +++
>  kernel/trace/trace.c                          | 51 +++++++++++++++++++
>  2 files changed, 57 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 6cfa6e3996cf..cec486217ccc 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -6272,6 +6272,12 @@
>  			comma-separated list of trace events to enable. See
>  			also Documentation/trace/events.rst
>  
> +	trace_instance=[instance-info]
> +			[FTRACE] Create an ring buffer instance early in boot up.

s/an/a/

> +			This will be listed in:
> +
> +				/sys/kernel/tracing/instances
> +
>  	trace_options=[option-list]
>  			[FTRACE] Enable or disable tracer options at boot.
>  			The option-list is a comma delimited list of options


-- 
~Randy