Date: Fri, 2 Dec 2005 12:36:42 +0100
From: Andi Kleen <ak@suse.de>
To: Stephane Eranian <eranian@hpl.hp.com>
Cc: discuss@x86-64.org, linux-kernel@vger.kernel.org,
       perfctr-devel@lists.sourceforge.net
Subject: Re: [discuss] Re: [Perfctr-devel] Re: Enabling RDPMC in user space by default
Message-ID: <20051202113642.GK997@wotan.suse.de>
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On Thu, Dec 01, 2005 at 11:09:31PM -0800, Stephane Eranian wrote:
> But the interrupt is programmed for all counters. So by forcing the PMU
> interrupt to use the NMI vector then any perfmon interface would have to use

That is how it works yes. oprofile also uses NMIs.

> this interrupt as well. That will break the whole thing because in many
> places we rely on PMU interrupt being off.

If you rely on that then your subsystem is not usable on x86/x86-64.

-Andi
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