1 /*

     2  * Copyright (c) 2009, 2013, 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 {@code -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 static final int V_Constant  = 1;

    56     private static final int V_Monotonic = 2;

    57     private static final int V_Variable  = 3;

    58     private static final 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, type, U_None, 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 }