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 } |
|