NAME

       libpfm_intel_snbep_unc_pcu - support for Intel Sandy Bridge-EP Power Controller Unit (PCU)
       uncore PMU

SYNOPSIS

       #include <perfmon/pfmlib.h>

       PMU name: snbep_unc_pcu
       PMU desc: Intel Sandy Bridge-EP PCU uncore PMU

DESCRIPTION

       The library supports the Intel Sandy Bridge Power Controller Unit uncore  PMU.   This  PMU
       model  only  exists  on  Sandy  Bridge  model  45. There is only one PCU PMU per processor
       socket.

MODIFIERS

       The following modifiers are supported on Intel Sandy Bridge C-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].

       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)