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annotate graal/com.oracle.jvmci.debug/src/com/oracle/jvmci/debug/internal/MemUseTrackerImpl.java @ 21754:aa5fa1190d6c

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author Doug Simon <doug.simon@oracle.com>
date Fri, 05 Jun 2015 23:03:41 +0200
parents b1530a6cce8c
children
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.jvmci.debug.internal;
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24
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25 import static com.oracle.jvmci.debug.DebugCloseable.*;
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26 import static java.lang.Thread.*;
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27
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28 import java.lang.management.*;
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29
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30 import com.oracle.jvmci.debug.*;
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31 import com.sun.management.ThreadMXBean;
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32
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33 public final class MemUseTrackerImpl extends AccumulatedDebugValue implements DebugMemUseTracker {
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34
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35 private static final ThreadMXBean threadMXBean = (ThreadMXBean) ManagementFactory.getThreadMXBean();
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36
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37 /**
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38 * The amount of memory allocated by {@link ThreadMXBean#getThreadAllocatedBytes(long)} itself.
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39 */
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40 private static final long threadMXBeanOverhead = -getCurrentThreadAllocatedBytes() + getCurrentThreadAllocatedBytes();
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41
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42 public static long getCurrentThreadAllocatedBytes() {
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43 return threadMXBean.getThreadAllocatedBytes(currentThread().getId()) - threadMXBeanOverhead;
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44 }
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45
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46 /**
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47 * Records the most recent active tracker.
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48 */
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49 private static final ThreadLocal<CloseableCounterImpl> currentTracker = new ThreadLocal<>();
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50
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51 public MemUseTrackerImpl(String name, boolean conditional) {
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52 super(name, conditional, new DebugValue(name + "_Flat", conditional) {
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53
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54 @Override
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55 public String toString(long value) {
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56 return valueToString(value);
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57 }
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58 });
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59 }
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60
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61 @Override
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62 public DebugCloseable start() {
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63 if (!isConditional() || Debug.isMemUseTrackingEnabled()) {
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64 MemUseCloseableCounterImpl result = new MemUseCloseableCounterImpl(this);
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65 currentTracker.set(result);
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66 return result;
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67 } else {
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68 return VOID_CLOSEABLE;
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69 }
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70 }
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71
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72 public static String valueToString(long value) {
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73 return String.format("%d bytes", value);
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74 }
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75
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76 @Override
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77 public String toString(long value) {
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78 return valueToString(value);
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79 }
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80
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81 private static final class MemUseCloseableCounterImpl extends CloseableCounterImpl implements DebugCloseable {
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82
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83 private MemUseCloseableCounterImpl(AccumulatedDebugValue counter) {
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84 super(currentTracker.get(), counter);
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85 }
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86
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87 @Override
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88 long getCounterValue() {
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89 return getCurrentThreadAllocatedBytes();
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90 }
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91
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92 @Override
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93 public void close() {
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94 super.close();
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95 currentTracker.set(parent);
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96 }
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97 }
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98 }