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    SubjectRe: [PATCH] i386 add Intel PEBS and BTS cpufeature bits and detection
    Date
    > 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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