linux-kernel - Re: [PATCH] tracing: add trace console

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Date:	Wed, 16 Nov 2011 17:45:02 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] tracing: add trace console

On Wed, 2011-11-16 at 11:41 -0500, Steven Rostedt wrote:

> > That's possible, basically adding a tracepoints to printk -- that would
> > even catch everything and not require setting the console level (which
> > has its advantages too since other consoles might be slow).
> > 
> > It's a completely different thing though. I did it this way because it
> > was trivial to do out of tree for a quick test I was doing yesterday.
> > Doing it the other way is obviously more intrusive in core code.
> 
> I'm not sure it would be too invasive. Think you could get something
> working?

I briefly looked at it just after writing the email, but quickly got
lost in printk.c because of the multi-line handling it has. We could
instead trace each call to printk(), so the multi-line stuff would end
up in multiple events, but all of that code is too much vodoo for me :)

johannes

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