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    SubjectRe: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods

    * Ingo Molnar <> wrote:

    > The GUP based method is pretty generic though - and can be used on
    > other architectures as well. It's not as fast as direct access
    > though.

    Another question is: your patch switches over all normal exceptions
    from IRET to hand-unroll+RET.

    It would be really nice to benchmark it (via 'perf stat' for example
    ;-) whether that's a slowdown or a speedup.

    If it's a slowdown then the decision is easy: we dont want this, we
    want to push the overhead into the sampling code, away from common

    [ If on the other hand it's a speedup of a few cycles then we have
    the problem of me suddenly liking this patch a whole lot more ;-) ]


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