linux-kernel - Re: [PATCH 06/20 -v5] add notrace annotations for NMI routines

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Message-ID: <479DC1AB.1060304@siemens.com>
Date:	Mon, 28 Jan 2008 12:51:07 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Bird <tim.bird@...sony.com>,
	Sam Ravnborg <sam@...nborg.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	John Stultz <johnstul@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 06/20 -v5] add notrace annotations for NMI routines

Steven Rostedt wrote:
> On Wed, 23 Jan 2008, Mathieu Desnoyers wrote:
> 
>> * Steven Rostedt (rostedt@...dmis.org) wrote:
>>> This annotates NMI functions with notrace. Some tracers may be able
>>> to live with this, but some cannot. So we turn off NMI tracing.
>>>
>>> One solution might be to make a notrace_nmi which would only turn
>>> off NMI tracing if a trace utility needed it off.
>>>
>> Is this still needed with the atomic clocksource read ?
>>
> 
> Before you ask again, I've still included this in -v6, simply because I
> didn't get a chance to test it without this patch. I'll try to remember to
> do that on Monday.

Only in case you finally have to keep the annotations for the posted
tracer: Then please make it a Kconfig selectable restriction, because
there are use cases of the mcount hook where you are interested in NMI
invocations.

TiA,
Jan

-- 
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux
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