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.TH LIBPFM 4 "September, 2009" "" "Linux Programmer's Manual"
.SH NAME
libpfm_intel_atom - support for Intel Atom processors
.SH SYNOPSIS
.nf
.B #include <perfmon/pfmlib.h>
.sp
.B PMU name: atom
.B PMU desc: Intel Atom
.sp
.SH DESCRIPTION
The library supports all Intel Atom-based processors that includes family 6 model 28.
.SH MODIFIERS
The following modifiers are supported on Intel Atom processors:
.TP
.B u
Measure at user level which includes privilege levels 1, 2, 3. This is a boolean modifier.
.TP
.B k
Measure at kernel level which includes privilege level 0. This is a boolean modifier.
.TP
.B i
Invert the meaning of the event. The counter will now count cycles in which the event is \fBnot\fR
occurring. This is a boolean modifier
.TP
.B e
Enable edge detection, i.e., count only when there is a state transition. This is a boolean modifier.
.TP
.B 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].
.TP
.B t
Measure on both threads at the same time assuming hyper-threading is enabled. This is a boolean modifier.
.SH ENVIRONMENT VARIABLES
It is possible to force activation of the Intel Atom support using the \fBLIBPFM_FORCE_PMU\fR variable.
The PMU name, atom, must be passed. No additional options are supported.
.SH AUTHORS
.nf
Stephane Eranian <eranian@gmail.com>
.if
.PP