org.mmtk.utility.statistics

Class PerfEvent

java.lang.Object

org.mmtk.utility.statistics.Counter

org.mmtk.utility.statistics.LongCounter

org.mmtk.utility.statistics.PerfEvent

public final class PerfEvent
extends LongCounter

This class represents a perf event, such as cache misses, etc.

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	contended true if the counter did not run due to contention for a physical counter
static boolean	dataWasScaled true if any data was scaled
private int	index The index of the counter in the native array
private boolean	overflowed true if the counter overflowed
private long	previousValue The previously read value of the counter (used to detect overflow)
private static int	RAW_COUNT
private long[]	readBuffer A buffer passed to the native code when reading values, returns the tuple RAW_COUNT, TIME_ENABLED, TIME_RUNNING
private boolean	scaled true if the counter did not run all of the time and has been scaled appropriately
private static int	TIME_ENABLED
private static int	TIME_RUNNING

Fields inherited from class org.mmtk.utility.statistics.LongCounter

totalCount

Fields inherited from class org.mmtk.utility.statistics.Counter

complex

Constructor Summary

Constructors

Constructor and Description
PerfEvent(int index, String name)

Method Summary

Modifier and Type	Method and Description
String	getColumnSuffix() Return the (option) suffix to be used when reporting this counter
protected long	getCurrentValue() Counters are 64 bit unsigned in the kernel but only 63 bits are available in Java
(package private) void	printValue(long value) Print the given value

Methods inherited from class org.mmtk.utility.statistics.LongCounter

getLastTotal, phaseChange, printCount, printMax, printMin, printTotal, printTotal, start, stop

Methods inherited from class org.mmtk.utility.statistics.Counter

getName, getStart, isComplex, mergePhases, printLast

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

contended

private boolean contended

true if the counter did not run due to contention for a physical counter

scaled

private boolean scaled

true if the counter did not run all of the time and has been scaled appropriately

overflowed

private boolean overflowed

true if the counter overflowed

index

private final int index

The index of the counter in the native array

previousValue

private long previousValue

The previously read value of the counter (used to detect overflow)

readBuffer

private final long[] readBuffer

A buffer passed to the native code when reading values, returns the tuple RAW_COUNT, TIME_ENABLED, TIME_RUNNING

RAW_COUNT

private static final int RAW_COUNT

See Also:

Constant Field Values

TIME_ENABLED

private static final int TIME_ENABLED

See Also:

Constant Field Values

TIME_RUNNING

private static final int TIME_RUNNING

See Also:

Constant Field Values

dataWasScaled

public static boolean dataWasScaled

true if any data was scaled

Constructor Detail

PerfEvent

public PerfEvent(int index,
                 String name)

Method Detail

getCurrentValue

protected long getCurrentValue()

Counters are 64 bit unsigned in the kernel but only 63 bits are available in Java

Specified by:

getCurrentValue in class LongCounter

Returns:

the current value of this counter

printValue

void printValue(long value)

Description copied from class: LongCounter

Print the given value

Overrides:

printValue in class LongCounter

Parameters:

value - The value to be printed

getColumnSuffix

public String getColumnSuffix()

Description copied from class: Counter

Return the (option) suffix to be used when reporting this counter

Overrides:

getColumnSuffix in class Counter

Returns:

The suffix