plucky (3) libpfm_intel_hswep_unc_pcu.3.gz

NAME

       libpfm_intel_hswep_unc_pcu - support for Intel Haswell-EP Power Controller Unit (PCU) uncore PMU

SYNOPSIS

       #include <perfmon/pfmlib.h>

       PMU name: hswep_unc_pcu
       PMU desc: Intel Haswell-EP PCU uncore PMU

DESCRIPTION

       The  library  supports the Intel Haswell Power Controller Unit uncore PMU.  This PMU model only exists on
       Haswell model 63.

MODIFIERS

       The following modifiers are supported on Intel Haswell 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

       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>

                                                    May, 2015                                          LIBPFM(3)