Meanning of ceph perf dump

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Cephers,
Is there any documents or code definition to explain ceph perf dump? I am a little confusing about the output, for example, under filestore, there's journal_latency and apply_latency and each of them has avgcount and sum. I am not quite sure what's the unit and meaning of the numbers? How can I use these numbers to tuning my ceph cluster. Thanks a lot.

"filestore": {
        "journal_queue_max_ops": 300,
        "journal_queue_ops": 0,
        "journal_ops": 35893,
        "journal_queue_max_bytes": 33554432,
        "journal_queue_bytes": 0,
        "journal_bytes": 20579009432,
        "journal_latency": {
            "avgcount": 35893,
            "sum": 1213.560761279
        },
        "journal_wr": 34228,
        "journal_wr_bytes": {
            "avgcount": 34228,
            "sum": 20657713152
        },
        "journal_full": 0,
        "committing": 0,
        "commitcycle": 3207,
        "commitcycle_interval": {
            "avgcount": 3207,
            "sum": 16157.379852152
        },
        "commitcycle_latency": {
            "avgcount": 3207,
            "sum": 121.892109010
        },
        "op_queue_max_ops": 50,
        "op_queue_ops": 0,
        "ops": 35893,
        "op_queue_max_bytes": 104857600,
        "op_queue_bytes": 0,
        "bytes": 20578506930,
        "apply_latency": {
            "avgcount": 35893,
            "sum": 1327.974596287
        },
        "queue_transaction_latency_avg": {
            "avgcount": 35893,
            "sum": 0.025993727
        }
    },

Best Regards
-- Ray
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