Provided by: libpfm4-dev_4.10.1+git20-g7700f49-2_amd64 bug


       libpfm_intel_skx_unc_pcu  - support for Intel Skylake X Power Controller Unit (PCU) uncore


       #include <perfmon/pfmlib.h>

       PMU name: skx_unc_pcu
       PMU desc: Intel Skylake X Server PCU uncore PMU


       The library supports the Intel Skylake X Server Power Controller Unit uncore PMU.


       The following modifiers are supported on Intel Skylake X server PCU uncore PMU:

       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

       i      Invert the meaning of the threshold or edge filter. If set, the event  counts  when
              strictly  less  than  N  occurrences occur per cycle if threshold is set to N. When
              invert is set, then threshold must be set to non-zero  value.  If  set,  the  event
              counts  when  the  event transitions from occurring to not occurring (falling edge)
              when edge detection is set. This is a boolean modifier

Frequency band filtering

       There   are   3   events    which    support    frequency    band    filtering,    namely,
       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.


       Stephane Eranian <>

                                          January, 2018                                 LIBPFM(3)