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/*
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* Copyright 2009 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.misc;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.LongBuffer;
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import java.security.AccessController;
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/**
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* Performance counter support for internal JRE classes.
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* This class defines a fixed list of counters for the platform
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* to use as an interim solution until RFE# 6209222 is implemented.
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* The perf counters will be created in the jvmstat perf buffer
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* that the HotSpot VM creates. The default size is 32K and thus
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* the number of counters is bounded. You can alter the size
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* with -XX:PerfDataMemorySize=<bytes> option. If there is
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* insufficient memory in the jvmstat perf buffer, the C heap memory
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* will be used and thus the application will continue to run if
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* the counters added exceeds the buffer size but the counters
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* will be missing.
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*
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* See HotSpot jvmstat implementation for certain circumstances
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* that the jvmstat perf buffer is not supported.
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*
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*/
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public class PerfCounter {
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private static final Perf perf =
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AccessController.doPrivileged(new Perf.GetPerfAction());
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// Must match values defined in hotspot/src/share/vm/runtime/perfdata.hpp
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private final static int V_Constant = 1;
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private final static int V_Monotonic = 2;
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private final static int V_Variable = 3;
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private final static int U_None = 1;
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private final String name;
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private final LongBuffer lb;
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private PerfCounter(String name, int type) {
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this.name = name;
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ByteBuffer bb = perf.createLong(name, U_None, type, 0L);
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bb.order(ByteOrder.nativeOrder());
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this.lb = bb.asLongBuffer();
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}
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static PerfCounter newPerfCounter(String name) {
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return new PerfCounter(name, V_Variable);
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}
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static PerfCounter newConstantPerfCounter(String name) {
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PerfCounter c = new PerfCounter(name, V_Constant);
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return c;
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}
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/**
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* Returns the current value of the perf counter.
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*/
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public synchronized long get() {
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return lb.get(0);
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}
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/**
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* Sets the value of the perf counter to the given newValue.
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*/
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public synchronized void set(long newValue) {
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lb.put(0, newValue);
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}
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/**
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* Adds the given value to the perf counter.
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*/
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public synchronized void add(long value) {
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long res = get() + value;
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lb.put(0, res);
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}
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/**
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* Increments the perf counter with 1.
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*/
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public void increment() {
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add(1);
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}
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/**
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* Adds the given interval to the perf counter.
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*/
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public void addTime(long interval) {
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add(interval);
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}
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/**
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* Adds the elapsed time from the given start time (ns) to the perf counter.
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*/
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public void addElapsedTimeFrom(long startTime) {
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add(System.nanoTime() - startTime);
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}
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@Override
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public String toString() {
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return name + " = " + get();
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}
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static class CoreCounters {
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static final PerfCounter pdt = newPerfCounter("sun.classloader.parentDelegationTime");
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static final PerfCounter lc = newPerfCounter("sun.classloader.findClasses");
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static final PerfCounter lct = newPerfCounter("sun.classloader.findClassTime");
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static final PerfCounter rcbt = newPerfCounter("sun.urlClassLoader.readClassBytesTime");
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static final PerfCounter zfc = newPerfCounter("sun.zip.zipFiles");
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static final PerfCounter zfot = newPerfCounter("sun.zip.zipFile.openTime");
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}
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static class WindowsClientCounters {
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static final PerfCounter d3dAvailable = newConstantPerfCounter("sun.java2d.d3d.available");
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}
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/**
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* Number of findClass calls
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*/
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public static PerfCounter getFindClasses() {
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return CoreCounters.lc;
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}
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/**
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* Time (ns) spent in finding classes that includes
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* lookup and read class bytes and defineClass
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*/
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public static PerfCounter getFindClassTime() {
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return CoreCounters.lct;
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}
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/**
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* Time (ns) spent in finding classes
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*/
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public static PerfCounter getReadClassBytesTime() {
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return CoreCounters.rcbt;
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}
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/**
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* Time (ns) spent in the parent delegation to
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* the parent of the defining class loader
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*/
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public static PerfCounter getParentDelegationTime() {
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return CoreCounters.pdt;
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}
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/**
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* Number of zip files opened.
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*/
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public static PerfCounter getZipFileCount() {
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return CoreCounters.zfc;
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}
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/**
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* Time (ns) spent in opening the zip files that
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* includes building the entries hash table
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*/
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public static PerfCounter getZipFileOpenTime() {
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return CoreCounters.zfot;
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}
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/**
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* D3D graphic pipeline available
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*/
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public static PerfCounter getD3DAvailable() {
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return WindowsClientCounters.d3dAvailable;
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}
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}
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