Performance counter support for internal JRE classes. This class defines a fixed list of counters for the platform to use as an interim solution until RFE# 6209222 is implemented. The perf counters will be created in the jvmstat perf buffer that the HotSpot VM creates. The default size is 32K and thus the number of counters is bounded. You can alter the size with -XX:PerfDataMemorySize=<bytes> option. If there is insufficient memory in the jvmstat perf buffer, the C heap memory will be used and thus the application will continue to run if the counters added exceeds the buffer size but the counters will be missing. See HotSpot jvmstat implementation for certain circumstances that the jvmstat perf buffer is not supported.

Modifier and Type	Class and Description
pack-priv static class	PerfCounter.CoreCounters

Field Summary

Modifier and Type	Field and Description
private final LongBuffer	lb
private final String	name
private static final Perf	perf
private static final int	U_None
private static final int	V_Constant
private static final int	V_Monotonic
private static final int	V_Variable

Access	Constructor and Description
private	PerfCounter(String name, int type)

Method Summary

Modifier and Type	Method and Description
public synchronized void	add(long value) Adds the given value to the perf counter.
public void	addElapsedTimeFrom(long startTime) Adds the elapsed time from the given start time (ns) to the perf counter.
public void	addTime(long interval) Adds the given interval to the perf counter.
public synchronized long	get() Returns the current value of the perf counter.
public static PerfCounter	getFindClasses() Number of findClass calls
public static PerfCounter	getFindClassTime() Time (ns) spent in finding classes that includes lookup and read class bytes and defineClass
public static PerfCounter	getParentDelegationTime() Time (ns) spent in the parent delegation to the parent of the defining class loader
public static PerfCounter	getReadClassBytesTime() Time (ns) spent in finding classes
public static PerfCounter	getZipFileCount() Number of zip files opened.
public static PerfCounter	getZipFileOpenTime() Time (ns) spent in opening the zip files that includes building the entries hash table
public void	increment() Increments the perf counter with 1.
public static PerfCounter	newConstantPerfCounter(String name)
public static PerfCounter	newPerfCounter(String name)
public synchronized void	set(long newValue) Sets the value of the perf counter to the given newValue.
public String	toString() Overrides java.lang.Object.toString. Returns a string representation of the object.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll wait wait wait

Field Detail

lb	back to summary
private final LongBuffer lb

name	back to summary
private final String name

perf	back to summary
private static final Perf perf

U_None	back to summary
private static final int U_None

V_Constant	back to summary
private static final int V_Constant

V_Monotonic	back to summary
private static final int V_Monotonic

V_Variable	back to summary
private static final int V_Variable

Constructor Detail

PerfCounter	back to summary
private PerfCounter(String name, int type)

Method Detail

add	back to summary
public synchronized void add(long value) Adds the given value to the perf counter.

addElapsedTimeFrom	back to summary
public void addElapsedTimeFrom(long startTime) Adds the elapsed time from the given start time (ns) to the perf counter.

addTime	back to summary
public void addTime(long interval) Adds the given interval to the perf counter.

get	back to summary
public synchronized long get() Returns the current value of the perf counter.

getFindClasses	back to summary
public static PerfCounter getFindClasses() Number of findClass calls

getFindClassTime	back to summary
public static PerfCounter getFindClassTime() Time (ns) spent in finding classes that includes lookup and read class bytes and defineClass

getParentDelegationTime	back to summary
public static PerfCounter getParentDelegationTime() Time (ns) spent in the parent delegation to the parent of the defining class loader

getReadClassBytesTime	back to summary
public static PerfCounter getReadClassBytesTime() Time (ns) spent in finding classes

getZipFileCount	back to summary
public static PerfCounter getZipFileCount() Number of zip files opened.

getZipFileOpenTime	back to summary
public static PerfCounter getZipFileOpenTime() Time (ns) spent in opening the zip files that includes building the entries hash table

increment	back to summary
public void increment() Increments the perf counter with 1.

newConstantPerfCounter	back to summary
public static PerfCounter newConstantPerfCounter(String name)

newPerfCounter	back to summary
public static PerfCounter newPerfCounter(String name)

set	back to summary
public synchronized void set(long newValue) Sets the value of the perf counter to the given newValue.

toString back to summary

toString	back to summary
public String toString() Overrides java.lang.Object.toString. Doc from java.lang.Object.toString. Returns a string representation of the object. Satisfying this method's contract implies a non-`null` result must be returned. Annotations @Override

public String toString()

Overrides java.lang.Object.toString.

Doc from java.lang.Object.toString.

Returns a string representation of the object. Satisfying this method's contract implies a non-null result must be returned.

Annotations

@Override

jdk.internal.perf back to summary

pack-priv Class PerfCounter.CoreCounters

Class Inheritance

extends Object

java.lang.Object
jdk.internal.perf.PerfCounter.CoreCounters

Field Summary

Modifier and Type	Field and Description
pack-priv static final PerfCounter	lc
pack-priv static final PerfCounter	lct
pack-priv static final PerfCounter	pdt
pack-priv static final PerfCounter	rcbt
pack-priv static final PerfCounter	zfc
pack-priv static final PerfCounter	zfot

Constructor Summary

Access	Constructor and Description
pack-priv	CoreCounters()

Method Summary

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

lc	back to summary
pack-priv static final PerfCounter lc

lct	back to summary
pack-priv static final PerfCounter lct

pdt	back to summary
pack-priv static final PerfCounter pdt

rcbt	back to summary
pack-priv static final PerfCounter rcbt

zfc	back to summary
pack-priv static final PerfCounter zfc

zfot	back to summary
pack-priv static final PerfCounter zfot

Constructor Detail

CoreCounters	back to summary
pack-priv CoreCounters()

public Class PerfCounter

Nested and Inner Type Summary

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail

pack-priv Class PerfCounter.CoreCounters

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail