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    SubjectRe: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods
    Avi Kivity wrote:
    > On 06/15/2009 10:02 PM, Peter Zijlstra wrote:
    >> Ah, well, I have no idea who expensive cr2 is, if its like a regular
    >> register then it should be fine. If however its tons more expensive then
    >> we should really avoid it.
    >
    > IIRC it's pretty cheap, I measured it once when tuning the kvm context
    > switch code. I don't recall the exact numbers.
    >

    Sounds like a win to me.

    -hpa



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