Mercurial > hg > graal-compiler

annotate src/share/vm/memory/sharedHeap.cpp @ 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 f3aeae1f9fc5
children
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1 /*
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2 * Copyright (c) 2000, 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 #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/atomic.inline.hpp"
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33 #include "runtime/fprofiler.hpp"
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34 #include "runtime/java.hpp"
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35 #include "services/management.hpp"
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36 #include "utilities/copy.hpp"
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37 #include "utilities/workgroup.hpp"
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38
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39 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
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40
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41 SharedHeap* SharedHeap::_sh;
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42
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43 // The set of potentially parallel tasks in root scanning.
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44 enum SH_process_roots_tasks {
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45 SH_PS_Universe_oops_do,
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46 SH_PS_JNIHandles_oops_do,
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47 SH_PS_ObjectSynchronizer_oops_do,
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48 SH_PS_FlatProfiler_oops_do,
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49 SH_PS_Management_oops_do,
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50 SH_PS_SystemDictionary_oops_do,
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51 SH_PS_ClassLoaderDataGraph_oops_do,
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52 SH_PS_jvmti_oops_do,
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53 SH_PS_CodeCache_oops_do,
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54 // Leave this one last.
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55 SH_PS_NumElements
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56 };
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57
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58 SharedHeap::SharedHeap(CollectorPolicy* policy_) :
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59 CollectedHeap(),
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60 _collector_policy(policy_),
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61 _rem_set(NULL),
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62 _strong_roots_scope(NULL),
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63 _strong_roots_parity(0),
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64 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)),
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65 _workers(NULL)
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66 {
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67 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) {
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68 vm_exit_during_initialization("Failed necessary allocation.");
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69 }
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70 _sh = this; // ch is static, should be set only once.
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71 if ((UseParNewGC ||
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72 (UseConcMarkSweepGC && (CMSParallelInitialMarkEnabled ||
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73 CMSParallelRemarkEnabled)) ||
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74 UseG1GC) &&
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75 ParallelGCThreads > 0) {
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76 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads,
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77 /* are_GC_task_threads */true,
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78 /* are_ConcurrentGC_threads */false);
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79 if (_workers == NULL) {
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80 vm_exit_during_initialization("Failed necessary allocation.");
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81 } else {
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82 _workers->initialize_workers();
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83 }
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84 }
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85 }
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86
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87 int SharedHeap::n_termination() {
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88 return _process_strong_tasks->n_threads();
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89 }
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90
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91 void SharedHeap::set_n_termination(int t) {
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92 _process_strong_tasks->set_n_threads(t);
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93 }
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94
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95 bool SharedHeap::heap_lock_held_for_gc() {
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96 Thread* t = Thread::current();
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97 return Heap_lock->owned_by_self()
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98 || ( (t->is_GC_task_thread() || t->is_VM_thread())
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99 && _thread_holds_heap_lock_for_gc);
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100 }
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101
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102 void SharedHeap::set_par_threads(uint t) {
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103 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads");
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104 _n_par_threads = t;
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105 _process_strong_tasks->set_n_threads(t);
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106 }
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107
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108 #ifdef ASSERT
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109 class AssertNonScavengableClosure: public OopClosure {
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110 public:
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111 virtual void do_oop(oop* p) {
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112 assert(!Universe::heap()->is_in_partial_collection(*p),
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113 "Referent should not be scavengable."); }
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114 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
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115 };
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116 static AssertNonScavengableClosure assert_is_non_scavengable_closure;
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117 #endif
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118
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119 SharedHeap::StrongRootsScope* SharedHeap::active_strong_roots_scope() const {
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120 return _strong_roots_scope;
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121 }
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122 void SharedHeap::register_strong_roots_scope(SharedHeap::StrongRootsScope* scope) {
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123 assert(_strong_roots_scope == NULL, "Should only have one StrongRootsScope active");
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124 assert(scope != NULL, "Illegal argument");
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125 _strong_roots_scope = scope;
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126 }
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127 void SharedHeap::unregister_strong_roots_scope(SharedHeap::StrongRootsScope* scope) {
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128 assert(_strong_roots_scope == scope, "Wrong scope unregistered");
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129 _strong_roots_scope = NULL;
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130 }
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131
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132 void SharedHeap::change_strong_roots_parity() {
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133 // Also set the new collection parity.
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134 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2,
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135 "Not in range.");
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136 _strong_roots_parity++;
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137 if (_strong_roots_parity == 3) _strong_roots_parity = 1;
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138 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2,
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139 "Not in range.");
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140 }
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141
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142 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* heap, bool activate)
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143 : MarkScope(activate), _sh(heap), _n_workers_done_with_threads(0)
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144 {
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145 if (_active) {
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146 _sh->register_strong_roots_scope(this);
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147 _sh->change_strong_roots_parity();
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148 // Zero the claimed high water mark in the StringTable
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149 StringTable::clear_parallel_claimed_index();
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150 }
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151 }
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152
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153 SharedHeap::StrongRootsScope::~StrongRootsScope() {
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154 if (_active) {
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155 _sh->unregister_strong_roots_scope(this);
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156 }
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157 }
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158
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159 Monitor* SharedHeap::StrongRootsScope::_lock = new Monitor(Mutex::leaf, "StrongRootsScope lock", false);
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160
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161 void SharedHeap::StrongRootsScope::mark_worker_done_with_threads(uint n_workers) {
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162 // The Thread work barrier is only needed by G1 Class Unloading.
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163 // No need to use the barrier if this is single-threaded code.
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164 if (UseG1GC && ClassUnloadingWithConcurrentMark && n_workers > 0) {
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165 uint new_value = (uint)Atomic::add(1, &_n_workers_done_with_threads);
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166 if (new_value == n_workers) {
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167 // This thread is last. Notify the others.
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168 MonitorLockerEx ml(_lock, Mutex::_no_safepoint_check_flag);
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169 _lock->notify_all();
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170 }
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171 }
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172 }
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173
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174 void SharedHeap::StrongRootsScope::wait_until_all_workers_done_with_threads(uint n_workers) {
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175 assert(UseG1GC, "Currently only used by G1");
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176 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading");
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177
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178 // No need to use the barrier if this is single-threaded code.
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179 if (n_workers > 0 && (uint)_n_workers_done_with_threads != n_workers) {
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180 MonitorLockerEx ml(_lock, Mutex::_no_safepoint_check_flag);
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181 while ((uint)_n_workers_done_with_threads != n_workers) {
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182 _lock->wait(Mutex::_no_safepoint_check_flag, 0, false);
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183 }
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184 }
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185 }
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186
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187 void SharedHeap::process_roots(bool activate_scope,
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188 ScanningOption so,
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189 OopClosure* strong_roots,
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190 OopClosure* weak_roots,
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191 CLDClosure* strong_cld_closure,
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192 CLDClosure* weak_cld_closure,
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193 CodeBlobClosure* code_roots) {
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194 StrongRootsScope srs(this, activate_scope);
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195
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196 // General roots.
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197 assert(_strong_roots_parity != 0, "must have called prologue code");
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198 assert(code_roots != NULL, "code root closure should always be set");
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199 // _n_termination for _process_strong_tasks should be set up stream
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200 // in a method not running in a GC worker. Otherwise the GC worker
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201 // could be trying to change the termination condition while the task
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202 // is executing in another GC worker.
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203
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204 // Iterating over the CLDG and the Threads are done early to allow G1 to
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205 // first process the strong CLDs and nmethods and then, after a barrier,
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206 // let the thread process the weak CLDs and nmethods.
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207
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208 if (!_process_strong_tasks->is_task_claimed(SH_PS_ClassLoaderDataGraph_oops_do)) {
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209 ClassLoaderDataGraph::roots_cld_do(strong_cld_closure, weak_cld_closure);
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210 }
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211
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212 // Some CLDs contained in the thread frames should be considered strong.
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213 // Don't process them if they will be processed during the ClassLoaderDataGraph phase.
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214 CLDClosure* roots_from_clds_p = (strong_cld_closure != weak_cld_closure) ? strong_cld_closure : NULL;
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215 // Only process code roots from thread stacks if we aren't visiting the entire CodeCache anyway
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216 CodeBlobClosure* roots_from_code_p = (so & SO_AllCodeCache) ? NULL : code_roots;
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217
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218 Threads::possibly_parallel_oops_do(strong_roots, roots_from_clds_p, roots_from_code_p);
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219
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220 // This is the point where this worker thread will not find more strong CLDs/nmethods.
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221 // Report this so G1 can synchronize the strong and weak CLDs/nmethods processing.
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222 active_strong_roots_scope()->mark_worker_done_with_threads(n_par_threads());
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223
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224 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) {
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225 Universe::oops_do(strong_roots);
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226 }
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227 // Global (strong) JNI handles
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228 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do))
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229 JNIHandles::oops_do(strong_roots);
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230
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231 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do))
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232 ObjectSynchronizer::oops_do(strong_roots);
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233 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do))
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234 FlatProfiler::oops_do(strong_roots);
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235 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do))
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236 Management::oops_do(strong_roots);
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237 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do))
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238 JvmtiExport::oops_do(strong_roots);
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239
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240 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) {
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241 SystemDictionary::roots_oops_do(strong_roots, weak_roots);
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242 }
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243
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244 // All threads execute the following. A specific chunk of buckets
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245 // from the StringTable are the individual tasks.
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246 if (weak_roots != NULL) {
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247 if (CollectedHeap::use_parallel_gc_threads()) {
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248 StringTable::possibly_parallel_oops_do(weak_roots);
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249 } else {
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250 StringTable::oops_do(weak_roots);
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251 }
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252 }
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253
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254 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) {
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255 if (so & SO_ScavengeCodeCache) {
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256 assert(code_roots != NULL, "must supply closure for code cache");
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257
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258 // We only visit parts of the CodeCache when scavenging.
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259 CodeCache::scavenge_root_nmethods_do(code_roots);
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260 }
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261 if (so & SO_AllCodeCache) {
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262 assert(code_roots != NULL, "must supply closure for code cache");
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263
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264 // CMSCollector uses this to do intermediate-strength collections.
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265 // We scan the entire code cache, since CodeCache::do_unloading is not called.
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266 CodeCache::blobs_do(code_roots);
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267 }
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268 // Verify that the code cache contents are not subject to
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269 // movement by a scavenging collection.
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270 DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, !CodeBlobToOopClosure::FixRelocations));
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271 DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable));
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272 }
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273
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274 _process_strong_tasks->all_tasks_completed();
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275 }
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276
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277 void SharedHeap::process_all_roots(bool activate_scope,
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278 ScanningOption so,
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279 OopClosure* roots,
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280 CLDClosure* cld_closure,
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281 CodeBlobClosure* code_closure) {
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282 process_roots(activate_scope, so,
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283 roots, roots,
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284 cld_closure, cld_closure,
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285 code_closure);
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286 }
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287
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288 void SharedHeap::process_strong_roots(bool activate_scope,
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289 ScanningOption so,
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290 OopClosure* roots,
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291 CLDClosure* cld_closure,
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292 CodeBlobClosure* code_closure) {
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293 process_roots(activate_scope, so,
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294 roots, NULL,
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295 cld_closure, NULL,
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296 code_closure);
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297 }
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298
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299
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300 class AlwaysTrueClosure: public BoolObjectClosure {
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301 public:
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302 bool do_object_b(oop p) { return true; }
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303 };
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304 static AlwaysTrueClosure always_true;
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305
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306 void SharedHeap::process_weak_roots(OopClosure* root_closure) {
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307 // Global (weak) JNI handles
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308 JNIHandles::weak_oops_do(&always_true, root_closure);
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309 }
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310
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311 void SharedHeap::set_barrier_set(BarrierSet* bs) {
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312 _barrier_set = bs;
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313 // Cached barrier set for fast access in oops
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314 oopDesc::set_bs(bs);
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315 }
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316
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317 void SharedHeap::post_initialize() {
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318 CollectedHeap::post_initialize();
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319 ref_processing_init();
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320 }
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321
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322 void SharedHeap::ref_processing_init() {}
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323
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324 // Some utilities.
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325 void SharedHeap::print_size_transition(outputStream* out,
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326 size_t bytes_before,
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327 size_t bytes_after,
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328 size_t capacity) {
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329 out->print(" %d%s->%d%s(%d%s)",
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330 byte_size_in_proper_unit(bytes_before),
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331 proper_unit_for_byte_size(bytes_before),
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332 byte_size_in_proper_unit(bytes_after),
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333 proper_unit_for_byte_size(bytes_after),
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334 byte_size_in_proper_unit(capacity),
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335 proper_unit_for_byte_size(capacity));
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336 }