Intel® Atom

The Intel® Atom performance monitoring counters are equal to the ones of the Intel® Core 2 microarchitecture but the event set is different.

Available performance monitors for the Intel® Atom microarchitecture

• Fixed-purpose counters
• General-purpose counters

Counters available for each hardware thread

Fixed-purpose counters

The Core2/Atom microarchitecture is the first architecture offering a set of fixed-purpose counters. Each counter can measure only one specific event.

Counter and events

Counter name	Event name
FIXC0	INSTR_RETIRED_ANY
FIXC1	CPU_CLK_UNHALTED_CORE
FIXC2	CPU_CLK_UNHALTED_REF

Available Options

Option	Argument	Description	Comment
kernel	N	Set bit (index*4) in config register

General-purpose counters

The Intel® Atom microarchitecture provides 2 general-purpose counters consisting of a config and a counter register.

Counter and events

Counter name	Event name
PMC0	*
PMC1	*

Available Options

Option	Argument	Description	Comment
edgedetect	N	Set bit 18 in config register
kernel	N	Set bit 17 in config register
threshold	8 bit hex value	Set bits 24-31 in config register
invert	N	Set bit 23 in config register

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