scx_layered: queued_runtime tracking bug fix and disable xllc_mig_min_us by default #1093
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When a task gets dequeued and its property is changed so that it belongs to a different layer and then requeued, the current qrt tracking code deducts its runtime_avg from the wrong layer which leads to e.g. qrt underflows. Remember the layer the runtime is charged to and deduct it from there.
100us doesn't necessarily seem to behave better. Turn it off by default.
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