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NAME | SYNOPSIS | DESCRIPTION | MODIFIERS | AUTHORS | COLOPHON |
LIBPFM(3) Linux Programmer's Manual LIBPFM(3)
libpfm_intel_nhm_unc - support for Intel Nehalem uncore PMU
#include <perfmon/pfmlib.h>
PMU name: nhm_unc
PMU desc: Intel Nehalem uncore
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.
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.
Stephane Eranian <eranian@gmail.com>
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⟩ on 2017-07-05. If you dis‐
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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)