linux-kernel - Re: [PATCH -tip] perf_counter/x86: Fix incorrect default branch

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Message-ID: <20090609132313.GE25586@elte.hu>
Date:	Tue, 9 Jun 2009 15:23:13 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yong Wang <yong.y.wang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip] perf_counter/x86: Fix incorrect default branch

* Yong Wang <yong.y.wang@...ux.intel.com> wrote:

> The event selector and UMASK values of Nehalem do not apply to all 
> Intel processors.

The idea was to offer _some_ sort of table on new CPUs, instead of 
nothing...

Eventually Intel stops changing those model specific index values in 
future CPUs and puts them into architectural perfmon, for 
fundamental stats like L1/LLC cache statistics.

In that case defaulting to the latest (known) enumeration might work 
out to be just the thing used by all future CPUs.

So this is a subtle hint ;-)

	Ingo
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