perfmon2
   the hardware-based performance monitoring interface for Linux
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NAME

libpfm_intel_atom - support for Intel Atom processors  

SYNOPSIS

#include <perfmon/pfmlib.h>

PMU name: atom
PMU desc: Intel Atom

 

DESCRIPTION

The library supports all Intel Atom-based processors that includes family 6 model 28.

 

MODIFIERS

The following modifiers are supported on Intel Atom processors:
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-threading is enabled. This is a boolean modifier.
p
Enable precise sampling for this event. On Intel Atom, this triggers the use of the Precise Event Based Sampling (PEBS) mode. Not all events or unit masks support this mode. This is an integer modifier with values in the range [0-3]. The value of this modifier determines how the skid of the interrupted instruction address is handled by the kernel. The exact meaning of each of the four values depends on the underlying kernel interface. For perf_events, this determines how PERF_SAMPLE_IP is adjusted by the kernel. Refer to perf_events documentation for more details.
 

AUTHORS

Stephane Eranian <eranian@gmail.com>

 

Index

NAME
SYNOPSIS
DESCRIPTION
MODIFIERS
AUTHORS

This document was created by man2html, using the manual pages.
Time: 11:46:10 GMT, March 02, 2011
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