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    SubjectRe: [PATCH RFC] x86: avoid atomic operation in test_and_set_bit_lock if possible
    Date
    Ingo Molnar <mingo@elte.hu> writes:
    >
    > One good way to see cache bounces is to run a misses/accesses ratio profile:
    >
    > perf top -e cache-misses -e cache-references --count-filter 10
    >
    > Note the two events: this runs a 'weighted' profile, you'll see (LLC)
    > cache-misses of a function relative to cache-references it does, a
    > misses/references ratio in essence.

    If anyone does this on a Nehalem please only use 2.6.39-rc*+ which
    includes the offcore patches. Anything before that will get you complete
    bogus numbers.

    BTW with Lin-Ming's memory latency profiling code you can do this much
    more directly.

    -Andi
    --
    ak@linux.intel.com -- Speaking for myself only


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