LIBPFM(3)

NAME
libpfm_intel_skx_unc_ubo - support for Intel Skylake X Server IIO uncore PMU

SYNOPSIS
#include <perfmon/pfmlib.h>

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

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

MODIFIERS
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
Events UNC_IO_COMP_BUF_INSERTS, UNC_IO_DATA_REQ_BY_CPU, 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
Stephane Eranian <eranian@gmail.com>