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annotate src/share/vm/utilities/ticks.hpp @ 20543:e7d0505c8a30

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8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso
author tschatzl
date Fri, 10 Oct 2014 15:51:58 +0200
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1 /*
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2 * Copyright (c) 2013, 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 */
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24
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25 #ifndef SHARE_VM_UTILITIES_TICKS_HPP
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26 #define SHARE_VM_UTILITIES_TICKS_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "utilities/globalDefinitions.hpp"
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30
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31 class Ticks;
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32
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33 class Tickspan VALUE_OBJ_CLASS_SPEC {
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34 friend class Ticks;
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35 friend Tickspan operator-(const Ticks& end, const Ticks& start);
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36
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37 private:
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38 jlong _span_ticks;
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39
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40 Tickspan(const Ticks& end, const Ticks& start);
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41
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42 public:
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43 Tickspan() : _span_ticks(0) {}
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44
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45 Tickspan& operator+=(const Tickspan& rhs) {
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46 _span_ticks += rhs._span_ticks;
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47 return *this;
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48 }
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49
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50 jlong value() const {
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51 return _span_ticks;
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52 }
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53
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54 };
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55
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56 class Ticks VALUE_OBJ_CLASS_SPEC {
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57 private:
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58 jlong _stamp_ticks;
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59
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60 public:
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61 Ticks() : _stamp_ticks(0) {
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62 assert((_stamp_ticks = invalid_time_stamp) == invalid_time_stamp,
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63 "initial unstamped time value assignment");
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64 }
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65
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66 Ticks& operator+=(const Tickspan& span) {
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67 _stamp_ticks += span.value();
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68 return *this;
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69 }
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70
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71 Ticks& operator-=(const Tickspan& span) {
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72 _stamp_ticks -= span.value();
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73 return *this;
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74 }
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75
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76 void stamp();
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77
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78 jlong value() const {
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79 return _stamp_ticks;
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80 }
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81
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82 static const Ticks now();
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83
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84 #ifdef ASSERT
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85 static const jlong invalid_time_stamp;
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86 #endif
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87
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88 #ifndef PRODUCT
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89 // only for internal use by GC VM tests
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90 friend class TimePartitionPhasesIteratorTest;
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91 friend class GCTimerTest;
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92
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93 private:
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94 // implicit type conversion
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95 Ticks(int ticks) : _stamp_ticks(ticks) {}
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96
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97 #endif // !PRODUCT
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98
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99 };
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100
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101 class TicksToTimeHelper : public AllStatic {
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102 public:
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103 enum Unit {
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104 SECONDS = 1,
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105 MILLISECONDS = 1000
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106 };
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107 static double seconds(const Tickspan& span);
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108 static jlong milliseconds(const Tickspan& span);
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109 };
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110
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111 #endif // SHARE_VM_UTILITIES_TICKS_HPP