linux/tools/perf/pmu-events/arch/x86/ivybridge/counter.json

[
    {
        "Unit": "core",
        "CountersNumFixed": "3",
        "CountersNumGeneric": "4"
    },
    {
        "Unit": "ARB",
        "CountersNumFixed": "1",
        "CountersNumGeneric": "2"
    },
    {
        "Unit": "CBOX",
        "CountersNumFixed": "0",
        "CountersNumGeneric": "2"
    }
]