linux-kernel - Re: [patch] trace: Add user-space event tracing/injection

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Message-ID: <4CE55D15.1020908@linux.intel.com>
Date:	Thu, 18 Nov 2010 09:06:29 -0800
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Pekka Enberg <penberg@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [patch] trace: Add user-space event tracing/injection

On 11/18/2010 12:55 AM, Ingo Molnar wrote:
>
> * Darren Hart<dvhart@...ux.intel.com>  wrote:
>
>> Ideally I would like to see something just like trace_printf()
>> without having to define it myself in each of my testcases. [...]
>
> We can make the prctl a single-argument thing, at the cost of not allowing \0 in the
> content. (which is probably sane anyway)
>
> That way deployment is super-simple:
>
> 	prctl(35, "My Trace Message");
> 	...
>
>
> 	if (asprintf(&msg, "My Trace Message: %d\n", 1234) != -1) {
> 		prctl(35, *msg);
> 		free(*msg);
> 	}


I think that would be ideal.

-- 
Darren Hart
Yocto Linux Kernel
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