linux-kernel - Re: [for-next][PATCH 08/20] tracing: Warn if a tracepoint is not set via debugfs

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Message-ID: <1083852821.1959.1394657227042.JavaMail.zimbra@efficios.com>
Date:	Wed, 12 Mar 2014 20:47:07 +0000 (UTC)
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Berg <johannes.berg@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	lttng-dev <lttng-dev@...ts.lttng.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [for-next][PATCH 08/20] tracing: Warn if a tracepoint is not
 set via debugfs

----- Original Message -----
> From: "Andi Kleen" <andi@...stfloor.org>
> To: "Mathieu Desnoyers" <mathieu.desnoyers@...icios.com>
> Cc: "Steven Rostedt" <rostedt@...dmis.org>, "Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org, "Ingo
> Molnar" <mingo@...nel.org>, "Frederic Weisbecker" <fweisbec@...il.com>, "Andrew Morton" <akpm@...ux-foundation.org>,
> "Johannes Berg" <johannes.berg@...el.com>, "Linus Torvalds" <torvalds@...ux-foundation.org>, "Peter Zijlstra"
> <peterz@...radead.org>, "Thomas Gleixner" <tglx@...utronix.de>, "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
> "lttng-dev" <lttng-dev@...ts.lttng.org>, "Rusty Russell" <rusty@...tcorp.com.au>, "Andi Kleen" <andi@...stfloor.org>
> Sent: Wednesday, March 12, 2014 4:35:15 PM
> Subject: Re: [for-next][PATCH 08/20] tracing: Warn if a tracepoint is not set via debugfs
> 
> > So I understand that you wish to banish tracepoints from static inline
> > functions within headers to ensure they only appear within a single module.
> > This seems to be a step backward, but let's assume we stick to that rule.
> > Then how do you envision dealing with Link-Time Optimisations (LTO) ?
> 
> I assume it uses the file name defines set by Kbuild?

Just to make sure I understand your question: I understand that you are asking
whether tracepoints use file name defines at all in the naming of a tracepoint.
The answer to this question is: No, they do not.

> These don't change with
> LTO. It's whatever was specified at compile time. Also LTO doesn't
> inline over module boundaries (if the module is not built in)

Good to know. Can it inline core kernel functions into a module ?

Thanks,

Mathieu

> 
> -Andi
> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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