The following modifiers are supported on Intel Sandy Bridge R2PCIe uncore PMU:
i Invert the meaning of the event. The counter will now count R2 PCIe cycles in which the event is
not occurring. This is a boolean modifier
e Enable edge detection, i.e., count only when there is a state transition from no occurrence of the
event to at least one occurrence. This modifier must be combined with a threshold modifier (t)
with a value greater or equal to one. This is a boolean modifier.
t Set the threshold value. When set to a non-zero value, the counter counts the number of R2PCIe
cycles in which the number of occurrences of the event is greater or equal to the threshold. This
is an integer modifier with values in the range [0:15].