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    Subjectsemaphore and mutex in current Linux kernel (3.2.2)
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    Documentation/mutex-design.txt:

    "- 'struct mutex' is smaller on most architectures: E.g. on x86,
    'struct semaphore' is 20 bytes, 'struct mutex' is 16 bytes.
    A smaller structure size means less RAM footprint, and better
    CPU-cache utilization."
    ================================================================
    Now in my x86-64 32-bit Linux environment, 'struct semaphone' is 16 bytes,
    'struct mutex' is 20 bytes. So seems the RAM footprint advantages are not there...

    For the performance advantages followed, I don't have the ./test-mutex and maybe the
    testing environment, so haven't the 1st hand data for this item...






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