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libpfm_intel_skx_unc_pcu(3) — Linux manual page

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

NAME        top

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

SYNOPSIS        top

#include <perfmon/pfmlib.h>PMU name: skx_unc_pcuPMU desc: Intel Skylake X Server PCU uncore PMU

DESCRIPTION        top

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

MODIFIERS        top

       The following modifiers are supported on Intel Skylake X server       PCU uncore PMU:eEnable 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.tSet 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].iInvert 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        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 theperfmon2 (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       2025-08-11.  (At that time, the date of the most recent commit       that was found in the repository was 2025-06-29.)  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 isnot part of the original manual page), send a       mail to man-pages@man7.org                              January, 2018LIBPFM(3)

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