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annotate src/share/vm/memory/sharedHeap.cpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 441e946dc1af
children d0aa87f04bd5
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1 /*
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2 * Copyright (c) 2000, 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 */
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24
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25 #include "precompiled.hpp"
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26 #include "classfile/symbolTable.hpp"
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27 #include "classfile/systemDictionary.hpp"
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28 #include "code/codeCache.hpp"
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29 #include "gc_interface/collectedHeap.inline.hpp"
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30 #include "memory/sharedHeap.hpp"
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31 #include "oops/oop.inline.hpp"
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32 #include "runtime/fprofiler.hpp"
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33 #include "runtime/java.hpp"
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34 #include "services/management.hpp"
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35 #include "utilities/copy.hpp"
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36 #include "utilities/workgroup.hpp"
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37
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38 SharedHeap* SharedHeap::_sh;
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39
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40 // The set of potentially parallel tasks in strong root scanning.
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41 enum SH_process_strong_roots_tasks {
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42 SH_PS_Universe_oops_do,
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43 SH_PS_JNIHandles_oops_do,
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44 SH_PS_ObjectSynchronizer_oops_do,
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45 SH_PS_FlatProfiler_oops_do,
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46 SH_PS_Management_oops_do,
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47 SH_PS_SystemDictionary_oops_do,
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48 SH_PS_jvmti_oops_do,
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49 SH_PS_StringTable_oops_do,
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50 SH_PS_CodeCache_oops_do,
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51 // Leave this one last.
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52 SH_PS_NumElements
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53 };
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54
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55 SharedHeap::SharedHeap(CollectorPolicy* policy_) :
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56 CollectedHeap(),
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57 _collector_policy(policy_),
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58 _rem_set(NULL),
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59 _strong_roots_parity(0),
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60 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)),
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61 _workers(NULL)
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62 {
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63 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) {
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64 vm_exit_during_initialization("Failed necessary allocation.");
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65 }
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66 _sh = this; // ch is static, should be set only once.
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67 if ((UseParNewGC ||
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68 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) ||
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69 UseG1GC) &&
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70 ParallelGCThreads > 0) {
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71 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads,
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72 /* are_GC_task_threads */true,
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73 /* are_ConcurrentGC_threads */false);
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74 if (_workers == NULL) {
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75 vm_exit_during_initialization("Failed necessary allocation.");
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76 } else {
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77 _workers->initialize_workers();
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78 }
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79 }
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80 }
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81
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82 int SharedHeap::n_termination() {
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83 return _process_strong_tasks->n_threads();
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84 }
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85
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86 void SharedHeap::set_n_termination(int t) {
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87 _process_strong_tasks->set_n_threads(t);
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88 }
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89
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90 bool SharedHeap::heap_lock_held_for_gc() {
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91 Thread* t = Thread::current();
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92 return Heap_lock->owned_by_self()
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93 || ( (t->is_GC_task_thread() || t->is_VM_thread())
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94 && _thread_holds_heap_lock_for_gc);
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95 }
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96
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97 void SharedHeap::set_par_threads(uint t) {
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98 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads");
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99 _n_par_threads = t;
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100 _process_strong_tasks->set_n_threads(t);
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101 }
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102
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103 #ifdef ASSERT
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104 class AssertNonScavengableClosure: public OopClosure {
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105 public:
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106 virtual void do_oop(oop* p) {
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107 assert(!Universe::heap()->is_in_partial_collection(*p),
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108 "Referent should not be scavengable."); }
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109 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
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110 };
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111 static AssertNonScavengableClosure assert_is_non_scavengable_closure;
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112 #endif
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113
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114 void SharedHeap::change_strong_roots_parity() {
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115 // Also set the new collection parity.
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116 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2,
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117 "Not in range.");
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118 _strong_roots_parity++;
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119 if (_strong_roots_parity == 3) _strong_roots_parity = 1;
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120 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2,
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121 "Not in range.");
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122 }
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123
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124 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate)
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125 : MarkScope(activate)
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126 {
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127 if (_active) {
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128 outer->change_strong_roots_parity();
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129 }
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130 }
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131
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132 SharedHeap::StrongRootsScope::~StrongRootsScope() {
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133 // nothing particular
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134 }
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135
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136 void SharedHeap::process_strong_roots(bool activate_scope,
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137 bool is_scavenging,
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138 ScanningOption so,
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139 OopClosure* roots,
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140 CodeBlobClosure* code_roots,
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141 KlassClosure* klass_closure) {
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142 StrongRootsScope srs(this, activate_scope);
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143
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144 // General strong roots.
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145 assert(_strong_roots_parity != 0, "must have called prologue code");
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146 // _n_termination for _process_strong_tasks should be set up stream
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147 // in a method not running in a GC worker. Otherwise the GC worker
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148 // could be trying to change the termination condition while the task
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149 // is executing in another GC worker.
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150 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) {
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151 Universe::oops_do(roots);
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152 }
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153 // Global (strong) JNI handles
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154 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do))
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155 JNIHandles::oops_do(roots);
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156 // All threads execute this; the individual threads are task groups.
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157 if (ParallelGCThreads > 0) {
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158 Threads::possibly_parallel_oops_do(roots, code_roots);
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159 } else {
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160 Threads::oops_do(roots, code_roots);
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161 }
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162 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do))
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163 ObjectSynchronizer::oops_do(roots);
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164 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do))
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165 FlatProfiler::oops_do(roots);
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166 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do))
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167 Management::oops_do(roots);
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168 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do))
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169 JvmtiExport::oops_do(roots);
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170
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171 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) {
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172 if (so & SO_AllClasses) {
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173 SystemDictionary::oops_do(roots);
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174 ClassLoaderDataGraph::oops_do(roots, klass_closure, !is_scavenging);
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175 } else if (so & SO_SystemClasses) {
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176 SystemDictionary::always_strong_oops_do(roots);
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177 ClassLoaderDataGraph::always_strong_oops_do(roots, klass_closure, !is_scavenging);
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178 } else {
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179 ShouldNotReachHere2("We should always have selected either SO_AllClasses or SO_SystemClasses");
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180 }
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181 }
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182
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183 if (!_process_strong_tasks->is_task_claimed(SH_PS_StringTable_oops_do)) {
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184 if (so & SO_Strings) {
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185 StringTable::oops_do(roots);
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186 }
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187 }
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188
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189 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) {
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190 if (so & SO_CodeCache) {
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191 assert(code_roots != NULL, "must supply closure for code cache");
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192
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193 if (is_scavenging) {
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194 // We only visit parts of the CodeCache when scavenging.
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195 CodeCache::scavenge_root_nmethods_do(code_roots);
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196 } else {
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197 // CMSCollector uses this to do intermediate-strength collections.
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198 // We scan the entire code cache, since CodeCache::do_unloading is not called.
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199 CodeCache::blobs_do(code_roots);
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200 }
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201 }
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202 // Verify that the code cache contents are not subject to
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203 // movement by a scavenging collection.
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204 DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, /*do_marking=*/ false));
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205 DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable));
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206 }
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207
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208 _process_strong_tasks->all_tasks_completed();
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209 }
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210
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211 class AlwaysTrueClosure: public BoolObjectClosure {
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212 public:
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213 void do_object(oop p) { ShouldNotReachHere(); }
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214 bool do_object_b(oop p) { return true; }
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215 };
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216 static AlwaysTrueClosure always_true;
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217
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218 void SharedHeap::process_weak_roots(OopClosure* root_closure,
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219 CodeBlobClosure* code_roots,
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220 OopClosure* non_root_closure) {
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221 // Global (weak) JNI handles
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222 JNIHandles::weak_oops_do(&always_true, root_closure);
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223
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224 CodeCache::blobs_do(code_roots);
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225 StringTable::oops_do(root_closure);
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226 }
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227
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228 void SharedHeap::set_barrier_set(BarrierSet* bs) {
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229 _barrier_set = bs;
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230 // Cached barrier set for fast access in oops
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231 oopDesc::set_bs(bs);
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232 }
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233
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234 void SharedHeap::post_initialize() {
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235 ref_processing_init();
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236 }
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237
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238 void SharedHeap::ref_processing_init() {}
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239
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240 // Some utilities.
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241 void SharedHeap::print_size_transition(outputStream* out,
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242 size_t bytes_before,
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243 size_t bytes_after,
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244 size_t capacity) {
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245 out->print(" %d%s->%d%s(%d%s)",
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246 byte_size_in_proper_unit(bytes_before),
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247 proper_unit_for_byte_size(bytes_before),
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248 byte_size_in_proper_unit(bytes_after),
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249 proper_unit_for_byte_size(bytes_after),
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250 byte_size_in_proper_unit(capacity),
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251 proper_unit_for_byte_size(capacity));
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252 }