NAME

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

SYNOPSIS

       #include <perfmon/pfmlib.h>

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

DESCRIPTION

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

MODIFIERS

       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 [0:15].

       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_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>

                                                  January, 2018                                        LIBPFM(3)