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

libpfm_intel_icx_unc_iio - support for Intel IcelakeX Server IIO uncore PMU

#include <perfmon/pfmlib.h>

PMU name: icx_unc_iio[0-5]
PMU desc: Intel IcelakeX IIO uncore PMU

The library supports the Intel IcelakeX IIO (I/O controller) uncore PMU. Each IIO PMU implements 4 generic counters and free running counters (not yet supported by libpfm4). The current version of libpfm4 does not expose the fc_mask and ch_mask filter because these are hardcoded in the events provided by the library.

The following modifiers are supported on Intel IcelakeX IIO uncore PMU:

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.
Set the threshold value. When set to a non-zero value, the counter counts the number of IIO clockticks 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 [0:255].
Invert the threshold (t) test from strictly greater than to less or equal to. This is a boolean modifier. 

Stephane Eranian <eranian@gmail.com>
November, 2023