linux-kernel - Re: [PATCH] Documentation: describe trace_buf

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Message-ID: <20141203040620.254a8a02@gandalf.local.home>
Date:	Wed, 3 Dec 2014 04:06:20 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Ingo Molnar <mingo@...hat.com>, Jonathan Corbet <corbet@....net>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH] Documentation: describe trace_buf_size parameter more
 accurately

On Wed,  3 Dec 2014 10:39:20 +0900
Joonsoo Kim <iamjoonsoo.kim@....com> wrote:

> I'm stuck into panic that too litte free memory is left when I boot with
> trace_buf_size parameter. After digging into the problem, I found that
> trace_buf_size is the size of trace buffer on each cpu rather than total
> size of trace buffer. To prevent victim like me, change description of
> trace_buf_size parameter more accurately.

Heh, Thanks, I'll apply this.

-- Steve

> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> ---
>  Documentation/kernel-parameters.txt |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 70cfce5..fc77457 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -3546,7 +3546,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>  			are saved.
>  
>  	trace_buf_size=nn[KMG]
> -			[FTRACE] will set tracing buffer size.
> +			[FTRACE] will set tracing buffer size on each cpu.
>  
>  	trace_event=[event-list]
>  			[FTRACE] Set and start specified trace events in order

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