libpfm_intel_snbep_unc_qpi man page

libpfm_intel_snbep_unc_qpi — support for Intel Sandy Bridge-EP QPI uncore PMU

Synopsis

#include <perfmon/pfmlib.h>

PMU name: snbep_unc_qpi0, snbep_unc_qpi1
PMU desc: Intel Sandy Bridge-EP QPI uncore PMU

Description

The library supports the Intel Sandy Bridge Power QPI uncore PMU. This PMU model only exists on Sandy Bridge model 45. There are two QPI PMUs per processor socket.

Modifiers

The following modifiers are supported on Intel Sandy Bridge QPI uncore PMU:

i
Invert the meaning of the event. The counter will now count QPI 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 QPI 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 [0:255].

Authors

Stephane Eranian <eranian@gmail.com>

Info

August, 2012 Linux Programmer's Manual