LIBPFM(3)						     Linux Programmer's Manual							 LIBPFM(3)

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  modi-
	      fier

       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 multipled 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)