Re: [PATCH] i386 add Intel PEBS and BTS cpufeature bits and detection

[Andi Kleen]

> 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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