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annotate src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp @ 20804:7848fc12602b

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Merge with jdk8u40-b25
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Tue, 07 Apr 2015 14:58:49 +0200
parents 52b4284cb496 02e61cf08ab3
children
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1 /*
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2 * Copyright (c) 2001, 2014, 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_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP
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27
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28 #include "memory/iterator.hpp"
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29 #include "oops/oopsHierarchy.hpp"
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30 #include "runtime/os.hpp"
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31 #include "utilities/debug.hpp"
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32
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33 // A BufferingOops closure tries to separate out the cost of finding roots
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34 // from the cost of applying closures to them. It maintains an array of
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35 // ref-containing locations. Until the array is full, applying the closure
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36 // to an oop* merely records that location in the array. Since this
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37 // closure app cost is small, an elapsed timer can approximately attribute
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38 // all of this cost to the cost of finding the roots. When the array fills
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39 // up, the wrapped closure is applied to all elements, keeping track of
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40 // this elapsed time of this process, and leaving the array empty.
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41 // The caller must be sure to call "done" to process any unprocessed
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42 // buffered entriess.
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43
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44 class BufferingOopClosure: public OopClosure {
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45 friend class TestBufferingOopClosure;
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46 protected:
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47 static const size_t BufferLength = 1024;
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48
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49 // We need to know if the buffered addresses contain oops or narrowOops.
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50 // We can't tag the addresses the way StarTask does, because we need to
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51 // be able to handle unaligned addresses coming from oops embedded in code.
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52 //
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53 // The addresses for the full-sized oops are filled in from the bottom,
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54 // while the addresses for the narrowOops are filled in from the top.
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55 OopOrNarrowOopStar _buffer[BufferLength];
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56 OopOrNarrowOopStar* _oop_top;
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57 OopOrNarrowOopStar* _narrowOop_bottom;
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58
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59 OopClosure* _oc;
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60 double _closure_app_seconds;
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61
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62
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63 bool is_buffer_empty() {
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64 return _oop_top == _buffer && _narrowOop_bottom == (_buffer + BufferLength - 1);
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65 }
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66
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67 bool is_buffer_full() {
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68 return _narrowOop_bottom < _oop_top;
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69 }
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70
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71 // Process addresses containing full-sized oops.
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72 void process_oops() {
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73 for (OopOrNarrowOopStar* curr = _buffer; curr < _oop_top; ++curr) {
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74 _oc->do_oop((oop*)(*curr));
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75 }
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76 _oop_top = _buffer;
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77 }
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78
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79 // Process addresses containing narrow oops.
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80 void process_narrowOops() {
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81 for (OopOrNarrowOopStar* curr = _buffer + BufferLength - 1; curr > _narrowOop_bottom; --curr) {
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82 _oc->do_oop((narrowOop*)(*curr));
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83 }
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84 _narrowOop_bottom = _buffer + BufferLength - 1;
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85 }
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86
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87 // Apply the closure to all oops and clear the buffer.
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88 // Accumulate the time it took.
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89 void process_buffer() {
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90 double start = os::elapsedTime();
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91
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92 process_oops();
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93 process_narrowOops();
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94
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95 _closure_app_seconds += (os::elapsedTime() - start);
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96 }
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97
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98 void process_buffer_if_full() {
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99 if (is_buffer_full()) {
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100 process_buffer();
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101 }
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102 }
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103
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104 void add_narrowOop(narrowOop* p) {
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105 assert(!is_buffer_full(), "Buffer should not be full");
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106 *_narrowOop_bottom = (OopOrNarrowOopStar)p;
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107 _narrowOop_bottom--;
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108 }
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109
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110 void add_oop(oop* p) {
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111 assert(!is_buffer_full(), "Buffer should not be full");
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112 *_oop_top = (OopOrNarrowOopStar)p;
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113 _oop_top++;
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114 }
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115
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116 public:
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117 virtual void do_oop(narrowOop* p) {
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118 process_buffer_if_full();
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119 add_narrowOop(p);
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120 }
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121
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122 virtual void do_oop(oop* p) {
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123 process_buffer_if_full();
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124 add_oop(p);
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125 }
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126
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127 void done() {
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128 if (!is_buffer_empty()) {
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129 process_buffer();
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130 }
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131 }
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132
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133 double closure_app_seconds() {
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134 return _closure_app_seconds;
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135 }
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136
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137 BufferingOopClosure(OopClosure *oc) :
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138 _oc(oc),
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139 _oop_top(_buffer),
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140 _narrowOop_bottom(_buffer + BufferLength - 1),
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141 _closure_app_seconds(0.0) { }
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142 };
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143
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144 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP