libpfm_intel_snbep_unc_pcu(3) — Linux manual page

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

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

NAME         top

       libpfm_intel_snbep_unc_pcu - support for Intel Sandy Bridge-EP
       Power Controller Unit (PCU) uncore PMU

SYNOPSIS         top

       #include <perfmon/pfmlib.h>

       PMU name: snbep_unc_pcu
       PMU desc: Intel Sandy Bridge-EP PCU uncore PMU

DESCRIPTION         top

       The library supports the Intel Sandy Bridge Power Controller Unit
       uncore PMU.  This PMU model only exists on Sandy Bridge model 45.
       There is only one PCU PMU per processor socket.

MODIFIERS         top

       The following modifiers are supported on Intel Sandy Bridge C-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].

       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 perfmon2-libpfm4⟩ on
       2025-02-02.  (At that time, the date of the most recent commit
       that was found in the repository was 2025-01-27.)  If you discover
       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)