libpfm_intel_skx_unc_iio(3) — Linux manual page


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

NAME         top

       libpfm_intel_skx_unc_ubo - support for Intel Skylake X Server IIO
       uncore PMU

SYNOPSIS         top

       #include <perfmon/pfmlib.h>

       PMU name: skx_unc_iio[0-5]
       PMU desc: Intel Skylake X Server IIO uncore PMU

DESCRIPTION         top

       The library supports the Intel Skylake X server IIO uncore PMU.
       The IIO PMU is used to analyze I/O traffic from the PCIe

MODIFIERS         top

       The following modifiers are supported on Intel Skylake X server
       IIO 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

Filters         top

       UNC_IO_DATA_REQ_OF_CPU, support additional filtering via a set of
       umasks tracking requests completions. They umasks start with a
       FC_ prefix.  The other filter is the port filter and it is
       hardcoded as umasks for the same events.

AUTHORS         top

       Stephane Eranian <>

COLOPHON         top

       This page is part of the perfmon2 (a performance monitoring
       library) project.  Information about the project can be found at
       ⟨⟩.  If you have a bug report for
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                              January, 2018                    LIBPFM(3)