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annotate src/share/vm/classfile/metadataOnStackMark.cpp @ 20619:b12a2a9b05ca

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8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse Reviewed-by: mgerdin, coleenp, bdelsart
author stefank
date Thu, 02 Oct 2014 10:55:36 +0200
parents 2c6ef90f030a
children
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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 #include "precompiled.hpp"
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26 #include "classfile/metadataOnStackMark.hpp"
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27 #include "code/codeCache.hpp"
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28 #include "compiler/compileBroker.hpp"
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29 #include "oops/metadata.hpp"
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30 #include "prims/jvmtiImpl.hpp"
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31 #include "runtime/synchronizer.hpp"
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32 #include "runtime/thread.hpp"
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33 #include "services/threadService.hpp"
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34 #include "utilities/chunkedList.hpp"
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35
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36 volatile MetadataOnStackBuffer* MetadataOnStackMark::_used_buffers = NULL;
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37 volatile MetadataOnStackBuffer* MetadataOnStackMark::_free_buffers = NULL;
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38
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39 NOT_PRODUCT(bool MetadataOnStackMark::_is_active = false;)
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40
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41 // Walk metadata on the stack and mark it so that redefinition doesn't delete
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42 // it. Class unloading also walks the previous versions and might try to
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43 // delete it, so this class is used by class unloading also.
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44 MetadataOnStackMark::MetadataOnStackMark(bool visit_code_cache) {
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45 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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46 assert(_used_buffers == NULL, "sanity check");
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47 NOT_PRODUCT(_is_active = true;)
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48
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49 Threads::metadata_do(Metadata::mark_on_stack);
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50 if (visit_code_cache) {
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51 CodeCache::alive_nmethods_do(nmethod::mark_on_stack);
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52 }
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53 CompileBroker::mark_on_stack();
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54 JvmtiCurrentBreakpoints::metadata_do(Metadata::mark_on_stack);
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55 ThreadService::metadata_do(Metadata::mark_on_stack);
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56 }
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57
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58 MetadataOnStackMark::~MetadataOnStackMark() {
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59 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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60 // Unmark everything that was marked. Can't do the same walk because
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61 // redefine classes messes up the code cache so the set of methods
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62 // might not be the same.
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63
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64 retire_buffer_for_thread(Thread::current());
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65
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66 MetadataOnStackBuffer* buffer = const_cast<MetadataOnStackBuffer* >(_used_buffers);
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67 while (buffer != NULL) {
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68 // Clear on stack state for all metadata.
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69 size_t size = buffer->size();
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70 for (size_t i = 0; i < size; i++) {
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71 Metadata* md = buffer->at(i);
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72 md->set_on_stack(false);
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73 }
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74
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75 MetadataOnStackBuffer* next = buffer->next_used();
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76
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77 // Move the buffer to the free list.
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78 buffer->clear();
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79 buffer->set_next_used(NULL);
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80 buffer->set_next_free(const_cast<MetadataOnStackBuffer*>(_free_buffers));
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81 _free_buffers = buffer;
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82
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83 // Step to next used buffer.
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84 buffer = next;
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85 }
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86
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87 _used_buffers = NULL;
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88
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89 NOT_PRODUCT(_is_active = false;)
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90 }
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91
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92 void MetadataOnStackMark::retire_buffer(MetadataOnStackBuffer* buffer) {
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93 if (buffer == NULL) {
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94 return;
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95 }
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96
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97 MetadataOnStackBuffer* old_head;
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98
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99 do {
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100 old_head = const_cast<MetadataOnStackBuffer*>(_used_buffers);
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101 buffer->set_next_used(old_head);
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102 } while (Atomic::cmpxchg_ptr(buffer, &_used_buffers, old_head) != old_head);
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103 }
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104
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105 void MetadataOnStackMark::retire_buffer_for_thread(Thread* thread) {
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106 retire_buffer(thread->metadata_on_stack_buffer());
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107 thread->set_metadata_on_stack_buffer(NULL);
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108 }
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109
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110 bool MetadataOnStackMark::has_buffer_for_thread(Thread* thread) {
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111 return thread->metadata_on_stack_buffer() != NULL;
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112 }
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113
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114 MetadataOnStackBuffer* MetadataOnStackMark::allocate_buffer() {
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115 MetadataOnStackBuffer* allocated;
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116 MetadataOnStackBuffer* new_head;
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117
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118 do {
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119 allocated = const_cast<MetadataOnStackBuffer*>(_free_buffers);
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120 if (allocated == NULL) {
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121 break;
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122 }
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123 new_head = allocated->next_free();
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124 } while (Atomic::cmpxchg_ptr(new_head, &_free_buffers, allocated) != allocated);
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125
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126 if (allocated == NULL) {
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127 allocated = new MetadataOnStackBuffer();
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128 }
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129
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130 assert(!allocated->is_full(), err_msg("Should not be full: " PTR_FORMAT, p2i(allocated)));
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131
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132 return allocated;
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133 }
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134
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135 // Record which objects are marked so we can unmark the same objects.
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136 void MetadataOnStackMark::record(Metadata* m, Thread* thread) {
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137 assert(_is_active, "metadata on stack marking is active");
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138
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139 MetadataOnStackBuffer* buffer = thread->metadata_on_stack_buffer();
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140
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141 if (buffer != NULL && buffer->is_full()) {
b12a2a9b05ca 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
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142 retire_buffer(buffer);
b12a2a9b05ca 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
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143 buffer = NULL;
b12a2a9b05ca 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
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144 }
b12a2a9b05ca 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
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145
b12a2a9b05ca 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
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146 if (buffer == NULL) {
b12a2a9b05ca 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
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147 buffer = allocate_buffer();
b12a2a9b05ca 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
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148 thread->set_metadata_on_stack_buffer(buffer);
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149 }
b12a2a9b05ca 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
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150
b12a2a9b05ca 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
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151 buffer->push(m);
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5daaddd917a1 8006040: NPG: on_stack processing wastes space in ConstantPool
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152 }