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libpfm_intel_nhm_unc(3) — Linux manual page

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

NAME        top

       libpfm_intel_nhm_unc - support for Intel Nehalem uncore PMU

SYNOPSIS        top

#include <perfmon/pfmlib.h>PMU name: nhm_uncPMU desc: Intel Nehalem uncore

DESCRIPTION        top

       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        top

       The following modifiers are supported on Intel Nehalem processors:iInvert the meaning of the event. The counter will now count              cycles in which the event isnotoccurring. This is a              boolean modifiereEnable edge detection, i.e., count only when there is a              state transition. This is a boolean modifier.cSet 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].oCauses the queue occupancy counter associated with the              event to be cleared (zeroed). This is a boolean modifier.

AUTHORS        top

       Stephane Eranian <eranian@gmail.com>

COLOPHON        top

       This page is part of theperfmon2 (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       2025-08-11.  (At that time, the date of the most recent commit       that was found in the repository was 2025-06-29.)  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 isnot part of the original manual page), send a       mail to man-pages@man7.org                             September, 2009LIBPFM(3)

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