NAME libpfm_intel_nhm_unc - support for Intel Nehalem uncore PMU

SYNOPSIS

       #include <perfmon/pfmlib.h>

       PMU name: nhm_unc
       PMU desc: Intel Nehalem uncore

DESCRIPTION

       The library supports the Nehalem uncore PMU as implemented by processors such as Intel Core i7, and Intel
       Core i5.

       The PMU is located at the socket-level and is therefore shared between the various cores. By construction
       it can only measure at all privilege levels.

MODIFIERS

       The following modifiers are supported on Intel Nehalem processors:

       i      Invert  the  meaning  of  the  event.  The counter will now count 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.  This  is  a  boolean
              modifier.

       c      Set  the  counter  mask  value. The mask acts as a threshold. The counter will count the number of
              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].

       o      Causes  the  queue  occupancy  counter associated with the event to be cleared (zeroed). This is a
              boolean modifier.

AUTHORS

       Stephane Eranian <eranian@gmail.com>

                                                 September, 2009                                       LIBPFM(3)