From: Andi Kleen <ak@suse.de>
To: eranian@hpl.hp.com
Subject: Re: [PATCH] i386 add Intel PEBS and BTS cpufeature bits and detection
Date: Fri, 17 Nov 2006 10:22:20 +0100
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Cc: Jeremy Fitzhardinge <jeremy@goop.org>, linux-kernel@vger.kernel.org,
       akpm@osdl.org
References: <20061115213241.GC17238@frankl.hpl.hp.com> <200611170529.02460.ak@suse.de> <20061117075750.GA19907@frankl.hpl.hp.com>
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> The former
> stores from/to information into MSRs and is very small (4 branches). 

P4 since Prescott has 16

> On recent processors LBR and BTS can be constrained by priv level.

Doesn't help for kernel debugging.

-Andi
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