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| 1 | +/* | |
| 2 | + * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.misc; | |
| 27 | + | |
| 28 | +import java.nio.ByteBuffer; | |
| 29 | +import java.nio.ByteOrder; | |
| 30 | +import java.nio.LongBuffer; | |
| 31 | +import java.security.AccessController; | |
| 32 | + | |
| 33 | +/** | |
| 34 | + * Performance counter support for internal JRE classes. | |
| 35 | + * This class defines a fixed list of counters for the platform | |
| 36 | + * to use as an interim solution until RFE# 6209222 is implemented. | |
| 37 | + * The perf counters will be created in the jvmstat perf buffer | |
| 38 | + * that the HotSpot VM creates. The default size is 32K and thus | |
| 39 | + * the number of counters is bounded. You can alter the size | |
| 40 | + * with -XX:PerfDataMemorySize=<bytes> option. If there is | |
| 41 | + * insufficient memory in the jvmstat perf buffer, the C heap memory | |
| 42 | + * will be used and thus the application will continue to run if | |
| 43 | + * the counters added exceeds the buffer size but the counters | |
| 44 | + * will be missing. | |
| 45 | + * | |
| 46 | + * See HotSpot jvmstat implementation for certain circumstances | |
| 47 | + * that the jvmstat perf buffer is not supported. | |
| 48 | + * | |
| 49 | + */ | |
| 50 | +public class PerfCounter { | |
| 51 | + private static final Perf perf = | |
| 52 | + AccessController.doPrivileged(new Perf.GetPerfAction()); | |
| 53 | + | |
| 54 | + // Must match values defined in hotspot/src/share/vm/runtime/perfdata.hpp | |
| 55 | + private final static int V_Constant = 1; | |
| 56 | + private final static int V_Monotonic = 2; | |
| 57 | + private final static int V_Variable = 3; | |
| 58 | + private final static int U_None = 1; | |
| 59 | + | |
| 60 | + private final String name; | |
| 61 | + private final LongBuffer lb; | |
| 62 | + | |
| 63 | + private PerfCounter(String name, int type) { | |
| 64 | + this.name = name; | |
| 65 | + ByteBuffer bb = perf.createLong(name, U_None, type, 0L); | |
| 66 | + bb.order(ByteOrder.nativeOrder()); | |
| 67 | + this.lb = bb.asLongBuffer(); | |
| 68 | + } | |
| 69 | + | |
| 70 | + static PerfCounter newPerfCounter(String name) { | |
| 71 | + return new PerfCounter(name, V_Variable); | |
| 72 | + } | |
| 73 | + | |
| 74 | + static PerfCounter newConstantPerfCounter(String name) { | |
| 75 | + PerfCounter c = new PerfCounter(name, V_Constant); | |
| 76 | + return c; | |
| 77 | + } | |
| 78 | + | |
| 79 | + /** | |
| 80 | + * Returns the current value of the perf counter. | |
| 81 | + */ | |
| 82 | + public synchronized long get() { | |
| 83 | + return lb.get(0); | |
| 84 | + } | |
| 85 | + | |
| 86 | + /** | |
| 87 | + * Sets the value of the perf counter to the given newValue. | |
| 88 | + */ | |
| 89 | + public synchronized void set(long newValue) { | |
| 90 | + lb.put(0, newValue); | |
| 91 | + } | |
| 92 | + | |
| 93 | + /** | |
| 94 | + * Adds the given value to the perf counter. | |
| 95 | + */ | |
| 96 | + public synchronized void add(long value) { | |
| 97 | + long res = get() + value; | |
| 98 | + lb.put(0, res); | |
| 99 | + } | |
| 100 | + | |
| 101 | + /** | |
| 102 | + * Increments the perf counter with 1. | |
| 103 | + */ | |
| 104 | + public void increment() { | |
| 105 | + add(1); | |
| 106 | + } | |
| 107 | + | |
| 108 | + /** | |
| 109 | + * Adds the given interval to the perf counter. | |
| 110 | + */ | |
| 111 | + public void addTime(long interval) { | |
| 112 | + add(interval); | |
| 113 | + } | |
| 114 | + | |
| 115 | + /** | |
| 116 | + * Adds the elapsed time from the given start time (ns) to the perf counter. | |
| 117 | + */ | |
| 118 | + public void addElapsedTimeFrom(long startTime) { | |
| 119 | + add(System.nanoTime() - startTime); | |
| 120 | + } | |
| 121 | + | |
| 122 | + @Override | |
| 123 | + public String toString() { | |
| 124 | + return name + " = " + get(); | |
| 125 | + } | |
| 126 | + | |
| 127 | + static class CoreCounters { | |
| 128 | + static final PerfCounter pdt = newPerfCounter("sun.classloader.parentDelegationTime"); | |
| 129 | + static final PerfCounter lc = newPerfCounter("sun.classloader.findClasses"); | |
| 130 | + static final PerfCounter lct = newPerfCounter("sun.classloader.findClassTime"); | |
| 131 | + static final PerfCounter rcbt = newPerfCounter("sun.urlClassLoader.readClassBytesTime"); | |
| 132 | + static final PerfCounter zfc = newPerfCounter("sun.zip.zipFiles"); | |
| 133 | + static final PerfCounter zfot = newPerfCounter("sun.zip.zipFile.openTime"); | |
| 134 | + } | |
| 135 | + | |
| 136 | + static class WindowsClientCounters { | |
| 137 | + static final PerfCounter d3dAvailable = newConstantPerfCounter("sun.java2d.d3d.available"); | |
| 138 | + } | |
| 139 | + | |
| 140 | + /** | |
| 141 | + * Number of findClass calls | |
| 142 | + */ | |
| 143 | + public static PerfCounter getFindClasses() { | |
| 144 | + return CoreCounters.lc; | |
| 145 | + } | |
| 146 | + | |
| 147 | + /** | |
| 148 | + * Time (ns) spent in finding classes that includes | |
| 149 | + * lookup and read class bytes and defineClass | |
| 150 | + */ | |
| 151 | + public static PerfCounter getFindClassTime() { | |
| 152 | + return CoreCounters.lct; | |
| 153 | + } | |
| 154 | + | |
| 155 | + /** | |
| 156 | + * Time (ns) spent in finding classes | |
| 157 | + */ | |
| 158 | + public static PerfCounter getReadClassBytesTime() { | |
| 159 | + return CoreCounters.rcbt; | |
| 160 | + } | |
| 161 | + | |
| 162 | + /** | |
| 163 | + * Time (ns) spent in the parent delegation to | |
| 164 | + * the parent of the defining class loader | |
| 165 | + */ | |
| 166 | + public static PerfCounter getParentDelegationTime() { | |
| 167 | + return CoreCounters.pdt; | |
| 168 | + } | |
| 169 | + | |
| 170 | + /** | |
| 171 | + * Number of zip files opened. | |
| 172 | + */ | |
| 173 | + public static PerfCounter getZipFileCount() { | |
| 174 | + return CoreCounters.zfc; | |
| 175 | + } | |
| 176 | + | |
| 177 | + /** | |
| 178 | + * Time (ns) spent in opening the zip files that | |
| 179 | + * includes building the entries hash table | |
| 180 | + */ | |
| 181 | + public static PerfCounter getZipFileOpenTime() { | |
| 182 | + return CoreCounters.zfot; | |
| 183 | + } | |
| 184 | + | |
| 185 | + /** | |
| 186 | + * D3D graphic pipeline available | |
| 187 | + */ | |
| 188 | + public static PerfCounter getD3DAvailable() { | |
| 189 | + return WindowsClientCounters.d3dAvailable; | |
| 190 | + } | |
| 191 | +} | |