libpfm_intel_nhm_unc(3) — Linux manual page

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

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>

COLOPHON

       This page is part of the perfmon2 (a performance monitoring
       library) project.  Information about the project can be found at
       ⟨http://perfmon2.sourceforge.net/⟩.  If you have a bug report for
       this manual page, send it to
       perfmon2-devel@lists.sourceforge.net.  This page was obtained
       from the project's upstream Git repository
       ⟨git://git.code.sf.net/p/perfmon2/libpfm4 perfmon2-libpfm4⟩ on
       2024-06-14.  (At that time, the date of the most recent commit
       that was found in the repository was 2024-04-24.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to man-pages@man7.org

                             September, 2009                   LIBPFM(3)

Pages that refer to this page: libpfm(3)

---