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    SubjectRe: [PATCH 2/2] x86: introduce NMI_AUTO as nmi_watchdog option
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    On Wed, 04 Nov 2009 12:46:30 +0100, Ingo Molnar said:
    > What i'd like to see for the NMI watchdog is much more ambitious than
    > this: the use of perf events to run a periodic NMI callback.
    >
    > The NMI watchdog would cause the creation of a per-cpu perf_event
    > structure (in-kernel). All x86 CPUs that have perf event support (the
    > majority of them) will thus be able to have an NMI watchdog using a
    > nice, generic piece of code and we'd be able to phase out the open-coded
    > NMI watchdog code.

    What happens on older/smaller x86 CPUs that don't have any native support
    for perf events?
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