NAME

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

SYNOPSIS

       #include <perfmon/pfmlib.h>

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

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.

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.

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.

AUTHORS

       Stephane Eranian <eranian@gmail.com>

                                                  August, 2012                                         LIBPFM(3)