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    SubjectRe: [PATCH 1/6] perf_counter: powerpc: Enable use of software counters on 32-bit powerpc
    Kumar Gala writes:

    > On Jun 17, 2009, at 6:50 AM, Paul Mackerras wrote:

    > > +config PPC_HAVE_PMU_SUPPORT
    > > + bool
    >
    > what does this mean?

    At the moment it means that arch/powerpc/kernel/perf_counters.c works
    for at least some processors in the selected processor family.

    > > +
    > > +config PPC_PERF_CTRS
    > > + def_bool y
    > > + depends on PERF_COUNTERS && PPC_HAVE_PMU_SUPPORT
    > > + help
    > > + This enables the powerpc-specific perf_counter back-end.
    >
    > Can we distinguish between the two different architected perf counters
    > programming models to start with. Maybe something like:
    >
    > PPC_BOOK3S_PERF_CTRS and PPC_BOOK3E_PERF_CTRS (or
    > PPC_SERVER_PERF_CTRS / PPC_EMB_PERF_CTRS)

    We can do that once we have code to support the Freescale embedded PMU
    and we know how much of arch/powerpc/kernel/perf_counters.c is or
    isn't useful there. We don't have to get to the final state in one
    patch. I'd rather put this patch in as-is and then see a patch series
    that adds the Freescale embedded PMU support and makes whatever
    Kconfig changes are necessary later.

    Paul.


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