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    SubjectRe: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods
    * Peter Zijlstra ( wrote:
    > On Mon, 2009-06-15 at 14:48 -0400, Mathieu Desnoyers wrote:
    > > we should not care that much about the performance hit of
    > > saving/restoring the cr2 register at each nmi entry/exit.
    > But we do, perf counters very much cares about nmi performance.

    To a point where it cannot afford a simple register save/restore ?

    There is "caring" and "_caring_". I am tempted to ask what NMI handler
    execution frequency you have in mind here to figure out if we are not
    trying to optimize sub-nanoseconds per minutes. ;)


    Mathieu Desnoyers
    OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68

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