linux-kernel - Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

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Message-ID: <20060915202640.GB23318@Krystal>
Date:	Fri, 15 Sep 2006 16:26:40 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andrew Morton <akpm@...l.org>, tglx@...utronix.de,
	karim@...rsys.com, Paul Mundt <lethal@...ux-sh.org>,
	Jes Sorensen <jes@....com>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Tom Zanussi <zanussi@...ibm.com>, ltt-dev@...fik.org,
	Michel Dagenais <michel.dagenais@...ymtl.ca>
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

Hi,

* Alan Cox (alan@...rguk.ukuu.org.uk) wrote:
> In addition ideally we want a mechanism that is also sufficient that
> printk can be mangled into so that you can pull all the printk text
> strings _out_ of the kernel and into the debug traces for embedded work.
> 
> [ie you want printk("Oh dear %s exploded.\n", foo->bar); to end up with
> "Oh dear %s exploded.\n" out of kernel and in kernel
> 
> 		tracepoint_printk(foo->bar);
> 

Good idea, trivial to implement on top of LTTng. When seeing printk's reentrancy
limitations, I have though about doing it a couple of times.

Mathieu

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