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   libpfm_intel_snbep_unc_ubo    ( 3 )

поддержка Intel Sandy Bridge-EP U-Box uncore PMU (support for Intel Sandy Bridge-EP U-Box uncore PMU)

Имя (Name)

libpfm_intel_snbep_unc_ubo - support for Intel Sandy Bridge-EP U-
       Box uncore PMU

Синопсис (Synopsis)

#include <perfmon/pfmlib.h>

PMU name: snbep_unc_ubo PMU desc: Intel Sandy Bridge-EP U-Box uncore PMU


Описание (Description)

The library supports the Intel Sandy Bridge system configuration
       unit (U-Box) uncore PMU.  This PMU model only exists on Sandy
       Bridge model 45. There is only one U-Box PMU per processor
       socket.

Модификаторы (Modifiers)

The following modifiers are supported on Intel Sandy Bridge U-Box
       uncore PMU:

i Invert the meaning of the event. The counter will now count HA 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 HA 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].

oi Invert the meaning of the occupancy event POWER_STATE_OCCUPANCY. The counter will now count PCU cycles in which the event is not occurring. This is a boolean modifier

oe Enable edge detection for the occupancy event POWER_STATE_OCCUPANCY. The event now counts 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.

ff Enable frequency band filtering. This modifier applies only to the UNC_P_FREQ_BANDx_CYCLES events, where x is [0-3]. The modifiers expects an integer in the range [0-255]. The value is interpreted as a frequency value to be multiplied by 100Mhz. Thus if the value is 32, then all cycles where the processor is running at 3.2GHz and more are counted.


Фильтрация частотного диапазона (Frequency band filtering)

There are 3 events which support frequency band filtering,
       namely, UNC_P_FREQ_BAND0_CYCLES, UNC_P_FREQ_BAND1_CYCLES,
       UNC_P_FREQ_BAND2_CYCLES, UNC_P_FREQ_BAND3_CYCLES. The frequency
       filter (available via the ff modifier) is stored into a PMU
       shared register which hold all 4 possible frequency bands, one
       per event. However, the library generate the encoding for each
       event individually because it processes events one at a time. The
       caller or the underlying kernel interface may have to merge the
       band filter settings to program the filter register properly.