linux-kernel - Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods

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Message-ID: <20090615185046.GJ11248@elte.hu>
Date:	Mon, 15 Jun 2009 20:50:46 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>, mingo@...hat.com,
	hpa@...or.com, paulus@...ba.org, acme@...hat.com,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	penberg@...helsinki.fi, vegard.nossum@...il.com, efault@....de,
	jeremy@...p.org, npiggin@...e.de, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain
	support to use NMI-safe methods


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> I guess. However, having the ability to call module code in NMI 
> handler context [...]

I dont think we really want to execute module-provided code from NMI 
handlers. NMI context is pretty tricky to begin with. (Yes, i know 
it's possible via nmi notifiers or modular oprofile but it's a 
really bad practice IMHO.)

	Ingo
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