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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 | } | ||