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

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Message-ID: <20101118085513.GH26398@elte.hu>
Date:	Thu, 18 Nov 2010 09:55:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Darren Hart <dvhart@...ux.intel.com>
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


* 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);
	}

Thanks,

	Ingo
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