NAME | SYNOPSIS | DESCRIPTION | MODIFIERS | Frequency band filtering | AUTHORS | COLOPHON

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

NAME         top

       libpfm_intel_snbep_unc_ubo  - support for Intel Sandy Bridge-EP U-Box
       uncore PMU

SYNOPSIS         top

       #include <perfmon/pfmlib.h>

       PMU name: snbep_unc_ubo
       PMU desc: Intel Sandy Bridge-EP U-Box uncore PMU

DESCRIPTION         top

       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         top

       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
              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].

       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 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         top

       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         top

       Stephane Eranian <eranian@gmail.com>

COLOPHON         top

       This page is part of the perfmon2 (a performance monitoring library)
       project.  Information about the project can be found at 
       ⟨http://perfmon2.sourceforge.net/⟩.  If you have a bug report for this
       manual page, send it to perfmon2-devel@lists.sourceforge.net.  This
       page was obtained from the project's upstream Git repository 
       ⟨git://git.code.sf.net/p/perfmon2/libpfm4⟩ on 2017-07-05.  If you dis‐
       cover any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

                                August, 2012                       LIBPFM(3)