LIBPFM(3) Linux Programmer's Manual LIBPFM(3)NAMElibpfm_intel_x86_arch - support for Intel X86 architectural PMU
SYNOPSIS
#include <perfmon/pfmlib.h>
PMU name: ix86arch
PMU desc: Intel X86 architectural PMU
DESCRIPTION
The library supports any processor implementing the Intel architectural
PMU. This is a minimal PMU with a variable number of counters but pre‐
defined set of events. It is implemented in all recent processors
starting with Intel Core Duo/Core Solo.
It acts as a default PMU support in case the library is run on a very
recent processor for which the specific support has not yet been imple‐
mented.
MODIFIERS
The following modifiers are supported on Intel architectural PMU:
u Measure at user level which includes privilege levels 1, 2, 3.
This corresponds to PFM_PLM3. This is a boolean modifier.
k Measure at kernel level which includes privilege level 0. This
corresponds to PFM_PLM0. This is a boolean modifier.
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].
t Measure on both threads at the same time assuming hyper-thread‐
ing is enabled. This modifier requires at least version 3 of the
architectural PMU. This is a boolean modifier.
AUTHORS
Stephane Eranian <eranian@gmail.com>
September, 2009 LIBPFM(3)
