linux-kernel - Re: [RFC PATCH] dynamic debug - adding ring buffer storage support

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Date:	Tue, 22 Dec 2009 10:39:56 -0500
From:	Jason Baron <jbaron@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	mingo@...e.hu, rostedt@...dmis.org, fweisbec@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] dynamic debug - adding ring buffer storage support

On Tue, Dec 22, 2009 at 12:32:06PM +0100, Jiri Olsa wrote:
> Hi,
> 
> as I use dynamic debug sometimes, I thought it could be useful having
> the possibility to store the output somewhere else than dmesg.
> 
> The attached patch implements support for storing dynamic debug
> messages to the ring buffer.
> 
> The dynamic debug allows simple addition of new flags,
> so I added 'r' flag for ring buffer storage.
> 
> I used the ring buffer implementation from trace framework.
> 
> hopefuly this could be any use for others as well...
> plz let me know what you think,
> 
> jirka
> 

hi,

I like the idea of using the ring buffer for output. However, I'm not
sure why we need a separate one for this. I like adding the 'r' for ring
buffer storage, by why not just make this path call 'trace_printk()', and
store the string in the existing kernel tracing ring buffer? That way it
can interleave with other trace data as well.

thanks,

-Jason
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