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    SubjectRe: [PATCH 1/2] lib: Provide generic atomic64_t implementation
    Roland Dreier writes:

    > FWIW, Nehalem EX actually goes to 8 cores/16 threads per socket. But
    > worrying about 32-bit performance on Nehalem is a little silly -- this
    > simplest solution is simply to run a 64-bit kernel.

    I'm not worried about ANY x86 processor, 32-bit or 64-bit, in fact,
    since x86 already has an atomic64_t implementation for both 32-bit and
    64-bit.

    It is interesting, though, that arch/x86/include/asm/atomic_32.h
    unconditionally uses cmpxchg8b to implement atomic64_t, but I thought
    that cmpxchg8b didn't exist in processors prior to the Pentium.
    Presumably you can't use perf_counters on a 386 or 486.

    Paul.


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