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annotate src/share/vm/gc_interface/collectedHeap.cpp @ 12498:d00c31d8394f

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Flush deferred barrier when Graal and G1 are used
author Christos Kotselidis <christos.kotselidis@oracle.com>
date Mon, 21 Oct 2013 17:21:26 +0200
parents 819c0394c6e3
children 096c224171c4
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1 /*
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2 * Copyright (c) 2001, 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/systemDictionary.hpp"
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27 #include "gc_implementation/shared/gcHeapSummary.hpp"
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28 #include "gc_implementation/shared/gcTrace.hpp"
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29 #include "gc_implementation/shared/gcTraceTime.hpp"
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30 #include "gc_implementation/shared/gcWhen.hpp"
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31 #include "gc_implementation/shared/vmGCOperations.hpp"
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32 #include "gc_interface/allocTracer.hpp"
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33 #include "gc_interface/collectedHeap.hpp"
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34 #include "gc_interface/collectedHeap.inline.hpp"
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35 #include "memory/metaspace.hpp"
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36 #include "oops/oop.inline.hpp"
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37 #include "oops/instanceMirrorKlass.hpp"
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38 #include "runtime/init.hpp"
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39 #include "runtime/thread.inline.hpp"
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40 #include "services/heapDumper.hpp"
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43 #ifdef ASSERT
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44 int CollectedHeap::_fire_out_of_memory_count = 0;
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45 #endif
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46
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47 size_t CollectedHeap::_filler_array_max_size = 0;
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48
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49 template <>
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50 void EventLogBase<GCMessage>::print(outputStream* st, GCMessage& m) {
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51 st->print_cr("GC heap %s", m.is_before ? "before" : "after");
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52 st->print_raw(m);
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53 }
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54
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55 void GCHeapLog::log_heap(bool before) {
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56 if (!should_log()) {
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57 return;
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58 }
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59
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60 double timestamp = fetch_timestamp();
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61 MutexLockerEx ml(&_mutex, Mutex::_no_safepoint_check_flag);
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62 int index = compute_log_index();
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63 _records[index].thread = NULL; // Its the GC thread so it's not that interesting.
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64 _records[index].timestamp = timestamp;
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65 _records[index].data.is_before = before;
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66 stringStream st(_records[index].data.buffer(), _records[index].data.size());
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67 if (before) {
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68 Universe::print_heap_before_gc(&st, true);
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69 } else {
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70 Universe::print_heap_after_gc(&st, true);
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71 }
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72 }
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73
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74 VirtualSpaceSummary CollectedHeap::create_heap_space_summary() {
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75 size_t capacity_in_words = capacity() / HeapWordSize;
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76
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77 return VirtualSpaceSummary(
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78 reserved_region().start(), reserved_region().start() + capacity_in_words, reserved_region().end());
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79 }
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80
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81 GCHeapSummary CollectedHeap::create_heap_summary() {
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82 VirtualSpaceSummary heap_space = create_heap_space_summary();
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83 return GCHeapSummary(heap_space, used());
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84 }
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85
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86 MetaspaceSummary CollectedHeap::create_metaspace_summary() {
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87 const MetaspaceSizes meta_space(
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88 MetaspaceAux::allocated_capacity_bytes(),
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89 MetaspaceAux::allocated_used_bytes(),
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90 MetaspaceAux::reserved_bytes());
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91 const MetaspaceSizes data_space(
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92 MetaspaceAux::allocated_capacity_bytes(Metaspace::NonClassType),
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93 MetaspaceAux::allocated_used_bytes(Metaspace::NonClassType),
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94 MetaspaceAux::reserved_bytes(Metaspace::NonClassType));
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95 const MetaspaceSizes class_space(
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96 MetaspaceAux::allocated_capacity_bytes(Metaspace::ClassType),
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97 MetaspaceAux::allocated_used_bytes(Metaspace::ClassType),
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98 MetaspaceAux::reserved_bytes(Metaspace::ClassType));
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99
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100 return MetaspaceSummary(meta_space, data_space, class_space);
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101 }
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102
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103 void CollectedHeap::print_heap_before_gc() {
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104 if (PrintHeapAtGC) {
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105 Universe::print_heap_before_gc();
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106 }
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107 if (_gc_heap_log != NULL) {
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108 _gc_heap_log->log_heap_before();
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109 }
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110 }
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111
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112 void CollectedHeap::print_heap_after_gc() {
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113 if (PrintHeapAtGC) {
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114 Universe::print_heap_after_gc();
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115 }
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116 if (_gc_heap_log != NULL) {
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117 _gc_heap_log->log_heap_after();
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118 }
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119 }
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120
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121 void CollectedHeap::register_nmethod(nmethod* nm) {
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122 assert_locked_or_safepoint(CodeCache_lock);
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123 }
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124
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125 void CollectedHeap::unregister_nmethod(nmethod* nm) {
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126 assert_locked_or_safepoint(CodeCache_lock);
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127 }
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128
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129 void CollectedHeap::trace_heap(GCWhen::Type when, GCTracer* gc_tracer) {
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130 const GCHeapSummary& heap_summary = create_heap_summary();
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131 const MetaspaceSummary& metaspace_summary = create_metaspace_summary();
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132 gc_tracer->report_gc_heap_summary(when, heap_summary, metaspace_summary);
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133 }
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134
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135 void CollectedHeap::trace_heap_before_gc(GCTracer* gc_tracer) {
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136 trace_heap(GCWhen::BeforeGC, gc_tracer);
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137 }
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138
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139 void CollectedHeap::trace_heap_after_gc(GCTracer* gc_tracer) {
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140 trace_heap(GCWhen::AfterGC, gc_tracer);
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141 }
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142
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143 // Memory state functions.
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144
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145
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146 CollectedHeap::CollectedHeap() : _n_par_threads(0)
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147 {
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148 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT));
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149 const size_t elements_per_word = HeapWordSize / sizeof(jint);
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150 _filler_array_max_size = align_object_size(filler_array_hdr_size() +
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151 max_len / elements_per_word);
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152
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153 _barrier_set = NULL;
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154 _is_gc_active = false;
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155 _total_collections = _total_full_collections = 0;
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156 _gc_cause = _gc_lastcause = GCCause::_no_gc;
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157 NOT_PRODUCT(_promotion_failure_alot_count = 0;)
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158 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;)
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159
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160 if (UsePerfData) {
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161 EXCEPTION_MARK;
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162
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163 // create the gc cause jvmstat counters
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164 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause",
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165 80, GCCause::to_string(_gc_cause), CHECK);
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166
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167 _perf_gc_lastcause =
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168 PerfDataManager::create_string_variable(SUN_GC, "lastCause",
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169 80, GCCause::to_string(_gc_lastcause), CHECK);
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170 }
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171 _defer_initial_card_mark = false; // strengthened by subclass in pre_initialize() below.
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172 // Create the ring log
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173 if (LogEvents) {
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174 _gc_heap_log = new GCHeapLog();
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175 } else {
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176 _gc_heap_log = NULL;
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177 }
0
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178 }
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179
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180 // This interface assumes that it's being called by the
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181 // vm thread. It collects the heap assuming that the
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182 // heap lock is already held and that we are executing in
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183 // the context of the vm thread.
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184 void CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) {
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185 assert(Thread::current()->is_VM_thread(), "Precondition#1");
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186 assert(Heap_lock->is_locked(), "Precondition#2");
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187 GCCauseSetter gcs(this, cause);
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188 switch (cause) {
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189 case GCCause::_heap_inspection:
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190 case GCCause::_heap_dump:
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191 case GCCause::_metadata_GC_threshold : {
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192 HandleMark hm;
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193 do_full_collection(false); // don't clear all soft refs
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194 break;
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195 }
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196 case GCCause::_last_ditch_collection: {
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197 HandleMark hm;
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198 do_full_collection(true); // do clear all soft refs
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199 break;
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200 }
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201 default:
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202 ShouldNotReachHere(); // Unexpected use of this function
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203 }
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204 }
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205 MetaWord* CollectedHeap::satisfy_failed_metadata_allocation(
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206 ClassLoaderData* loader_data,
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207 size_t size, Metaspace::MetadataType mdtype) {
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208 return collector_policy()->satisfy_failed_metadata_allocation(loader_data, size, mdtype);
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209 }
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210
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211
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212 void CollectedHeap::pre_initialize() {
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213 // Used for ReduceInitialCardMarks (when COMPILER2 is used);
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214 // otherwise remains unused.
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215 #ifdef COMPILER2
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216 _defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers()
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217 && (DeferInitialCardMark || card_mark_must_follow_store());
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Christos Kotselidis <christos.kotselidis@oracle.com>
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218 #elif defined GRAAL
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Christos Kotselidis <christos.kotselidis@oracle.com>
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219 _defer_initial_card_mark = GraalDeferredInitBarriers && can_elide_tlab_store_barriers()
c4af81d4fcc3 Customize deferred barrier flags fro Graal
Christos Kotselidis <christos.kotselidis@oracle.com>
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220 && (DeferInitialCardMark || card_mark_must_follow_store());
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221 #else
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222 assert(_defer_initial_card_mark == false, "Who would set it?");
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223 #endif
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224 }
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225
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226 #ifndef PRODUCT
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227 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) {
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228 if (CheckMemoryInitialization && ZapUnusedHeapArea) {
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229 for (size_t slot = 0; slot < size; slot += 1) {
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230 assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal),
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231 "Found badHeapWordValue in post-allocation check");
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232 }
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233 }
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234 }
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235
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236 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) {
0
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237 if (CheckMemoryInitialization && ZapUnusedHeapArea) {
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238 for (size_t slot = 0; slot < size; slot += 1) {
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239 assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal),
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240 "Found non badHeapWordValue in pre-allocation check");
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241 }
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242 }
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243 }
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244 #endif // PRODUCT
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245
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246 #ifdef ASSERT
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247 void CollectedHeap::check_for_valid_allocation_state() {
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248 Thread *thread = Thread::current();
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249 // How to choose between a pending exception and a potential
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250 // OutOfMemoryError? Don't allow pending exceptions.
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251 // This is a VM policy failure, so how do we exhaustively test it?
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252 assert(!thread->has_pending_exception(),
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253 "shouldn't be allocating with pending exception");
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254 if (StrictSafepointChecks) {
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255 assert(thread->allow_allocation(),
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256 "Allocation done by thread for which allocation is blocked "
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257 "by No_Allocation_Verifier!");
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258 // Allocation of an oop can always invoke a safepoint,
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259 // hence, the true argument
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260 thread->check_for_valid_safepoint_state(true);
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261 }
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262 }
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263 #endif
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264
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f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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265 HeapWord* CollectedHeap::allocate_from_tlab_slow(KlassHandle klass, Thread* thread, size_t size) {
0
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266
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267 // Retain tlab and allocate object in shared space if
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268 // the amount free in the tlab is too large to discard.
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269 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) {
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270 thread->tlab().record_slow_allocation(size);
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271 return NULL;
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272 }
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273
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274 // Discard tlab and allocate a new one.
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275 // To minimize fragmentation, the last TLAB may be smaller than the rest.
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276 size_t new_tlab_size = thread->tlab().compute_size(size);
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277
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278 thread->tlab().clear_before_allocation();
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279
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280 if (new_tlab_size == 0) {
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281 return NULL;
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282 }
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283
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284 // Allocate a new TLAB...
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285 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size);
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286 if (obj == NULL) {
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287 return NULL;
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288 }
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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289
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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diff changeset
290 AllocTracer::send_allocation_in_new_tlab_event(klass, new_tlab_size * HeapWordSize, size * HeapWordSize);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
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291
0
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292 if (ZeroTLAB) {
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293 // ..and clear it.
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294 Copy::zero_to_words(obj, new_tlab_size);
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295 } else {
3892
baf763f388e6 7059037: Use BIS for zeroing on T4
kvn
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296 // ...and zap just allocated object.
baf763f388e6 7059037: Use BIS for zeroing on T4
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diff changeset
297 #ifdef ASSERT
baf763f388e6 7059037: Use BIS for zeroing on T4
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298 // Skip mangling the space corresponding to the object header to
baf763f388e6 7059037: Use BIS for zeroing on T4
kvn
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299 // ensure that the returned space is not considered parsable by
baf763f388e6 7059037: Use BIS for zeroing on T4
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300 // any concurrent GC thread.
baf763f388e6 7059037: Use BIS for zeroing on T4
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301 size_t hdr_size = oopDesc::header_size();
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302 Copy::fill_to_words(obj + hdr_size, new_tlab_size - hdr_size, badHeapWordVal);
baf763f388e6 7059037: Use BIS for zeroing on T4
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diff changeset
303 #endif // ASSERT
0
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304 }
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305 thread->tlab().fill(obj, obj + size, new_tlab_size);
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306 return obj;
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307 }
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308
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diff changeset
309 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) {
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310 MemRegion deferred = thread->deferred_card_mark();
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diff changeset
311 if (!deferred.is_empty()) {
1166
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312 assert(_defer_initial_card_mark, "Otherwise should be empty");
1027
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diff changeset
313 {
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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314 // Verify that the storage points to a parsable object in heap
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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315 DEBUG_ONLY(oop old_obj = oop(deferred.start());)
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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316 assert(is_in(old_obj), "Not in allocated heap");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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317 assert(!can_elide_initializing_store_barrier(old_obj),
1166
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318 "Else should have been filtered in new_store_pre_barrier()");
1027
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319 assert(old_obj->is_oop(true), "Not an oop");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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320 assert(deferred.word_size() == (size_t)(old_obj->size()),
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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321 "Mismatch: multiple objects?");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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322 }
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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323 BarrierSet* bs = barrier_set();
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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324 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet");
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325 bs->write_region(deferred);
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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326 // "Clear" the deferred_card_mark field
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327 thread->set_deferred_card_mark(MemRegion());
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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328 }
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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329 assert(thread->deferred_card_mark().is_empty(), "invariant");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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330 }
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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331
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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332 // Helper for ReduceInitialCardMarks. For performance,
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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333 // compiled code may elide card-marks for initializing stores
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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334 // to a newly allocated object along the fast-path. We
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335 // compensate for such elided card-marks as follows:
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336 // (a) Generational, non-concurrent collectors, such as
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337 // GenCollectedHeap(ParNew,DefNew,Tenured) and
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338 // ParallelScavengeHeap(ParallelGC, ParallelOldGC)
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339 // need the card-mark if and only if the region is
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340 // in the old gen, and do not care if the card-mark
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341 // succeeds or precedes the initializing stores themselves,
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342 // so long as the card-mark is completed before the next
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343 // scavenge. For all these cases, we can do a card mark
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344 // at the point at which we do a slow path allocation
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345 // in the old gen, i.e. in this call.
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346 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires
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347 // in addition that the card-mark for an old gen allocated
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348 // object strictly follow any associated initializing stores.
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349 // In these cases, the memRegion remembered below is
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350 // used to card-mark the entire region either just before the next
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351 // slow-path allocation by this thread or just before the next scavenge or
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352 // CMS-associated safepoint, whichever of these events happens first.
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353 // (The implicit assumption is that the object has been fully
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354 // initialized by this point, a fact that we assert when doing the
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355 // card-mark.)
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356 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a
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357 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is
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358 // is used to remember the pre-value of any store. Initializing
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359 // stores will not need this barrier, so we need not worry about
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360 // compensating for the missing pre-barrier here. Turning now
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361 // to the post-barrier, we note that G1 needs a RS update barrier
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362 // which simply enqueues a (sequence of) dirty cards which may
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363 // optionally be refined by the concurrent update threads. Note
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364 // that this barrier need only be applied to a non-young write,
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365 // but, like in CMS, because of the presence of concurrent refinement
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366 // (much like CMS' precleaning), must strictly follow the oop-store.
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367 // Thus, using the same protocol for maintaining the intended
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368 // invariants turns out, serendepitously, to be the same for both
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369 // G1 and CMS.
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370 //
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371 // For any future collector, this code should be reexamined with
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372 // that specific collector in mind, and the documentation above suitably
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373 // extended and updated.
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374 oop CollectedHeap::new_store_pre_barrier(JavaThread* thread, oop new_obj) {
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375 // If a previous card-mark was deferred, flush it now.
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376 flush_deferred_store_barrier(thread);
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377 if (can_elide_initializing_store_barrier(new_obj)) {
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378 // The deferred_card_mark region should be empty
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379 // following the flush above.
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380 assert(thread->deferred_card_mark().is_empty(), "Error");
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381 } else {
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382 MemRegion mr((HeapWord*)new_obj, new_obj->size());
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383 assert(!mr.is_empty(), "Error");
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384 if (_defer_initial_card_mark) {
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385 // Defer the card mark
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386 thread->set_deferred_card_mark(mr);
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387 } else {
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388 // Do the card mark
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389 BarrierSet* bs = barrier_set();
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390 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet");
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391 bs->write_region(mr);
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392 }
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393 }
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394 return new_obj;
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395 }
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396
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397 size_t CollectedHeap::filler_array_hdr_size() {
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398 return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long
481
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399 }
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400
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401 size_t CollectedHeap::filler_array_min_size() {
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402 return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment
481
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403 }
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404
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405 #ifdef ASSERT
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406 void CollectedHeap::fill_args_check(HeapWord* start, size_t words)
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407 {
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408 assert(words >= min_fill_size(), "too small to fill");
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409 assert(words % MinObjAlignment == 0, "unaligned size");
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410 assert(Universe::heap()->is_in_reserved(start), "not in heap");
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411 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap");
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412 }
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413
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414 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap)
481
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415 {
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416 if (ZapFillerObjects && zap) {
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417 Copy::fill_to_words(start + filler_array_hdr_size(),
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418 words - filler_array_hdr_size(), 0XDEAFBABE);
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419 }
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420 }
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421 #endif // ASSERT
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422
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423 void
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424 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap)
481
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425 {
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426 assert(words >= filler_array_min_size(), "too small for an array");
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427 assert(words <= filler_array_max_size(), "too big for a single object");
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428
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429 const size_t payload_size = words - filler_array_hdr_size();
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430 const size_t len = payload_size * HeapWordSize / sizeof(jint);
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431 assert((int)len >= 0, err_msg("size too large " SIZE_FORMAT " becomes %d", words, (int)len));
481
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432
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433 // Set the length first for concurrent GC.
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434 ((arrayOop)start)->set_length((int)len);
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435 post_allocation_setup_common(Universe::intArrayKlassObj(), start);
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436 DEBUG_ONLY(zap_filler_array(start, words, zap);)
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437 }
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438
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439 void
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440 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap)
481
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441 {
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442 assert(words <= filler_array_max_size(), "too big for a single object");
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443
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444 if (words >= filler_array_min_size()) {
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445 fill_with_array(start, words, zap);
481
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446 } else if (words > 0) {
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447 assert(words == min_fill_size(), "unaligned size");
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448 post_allocation_setup_common(SystemDictionary::Object_klass(), start);
481
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449 }
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450 }
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451
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452 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap)
481
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diff changeset
453 {
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454 DEBUG_ONLY(fill_args_check(start, words);)
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455 HandleMark hm; // Free handles before leaving.
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456 fill_with_object_impl(start, words, zap);
481
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457 }
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458
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459 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap)
481
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diff changeset
460 {
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461 DEBUG_ONLY(fill_args_check(start, words);)
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462 HandleMark hm; // Free handles before leaving.
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463
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diff changeset
464 #ifdef _LP64
481
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465 // A single array can fill ~8G, so multiple objects are needed only in 64-bit.
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466 // First fill with arrays, ensuring that any remaining space is big enough to
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467 // fill. The remainder is filled with a single object.
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468 const size_t min = min_fill_size();
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469 const size_t max = filler_array_max_size();
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470 while (words > max) {
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471 const size_t cur = words - max >= min ? max : max - min;
1165
2dd52dea6d28 6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents: 1142
diff changeset
472 fill_with_array(start, cur, zap);
481
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues
jcoomes
parents: 356
diff changeset
473 start += cur;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues
jcoomes
parents: 356
diff changeset
474 words -= cur;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues
jcoomes
parents: 356
diff changeset
475 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues
jcoomes
parents: 356
diff changeset
476 #endif
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues
jcoomes
parents: 356
diff changeset
477
1165
2dd52dea6d28 6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents: 1142
diff changeset
478 fill_with_object_impl(start, words, zap);
481
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues
jcoomes
parents: 356
diff changeset
479 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues
jcoomes
parents: 356
diff changeset
480
0
a61af66fc99e Initial load
duke
parents:
diff changeset
481 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) {
a61af66fc99e Initial load
duke
parents:
diff changeset
482 guarantee(false, "thread-local allocation buffers not supported");
a61af66fc99e Initial load
duke
parents:
diff changeset
483 return NULL;
a61af66fc99e Initial load
duke
parents:
diff changeset
484 }
a61af66fc99e Initial load
duke
parents:
diff changeset
485
a61af66fc99e Initial load
duke
parents:
diff changeset
486 void CollectedHeap::ensure_parsability(bool retire_tlabs) {
a61af66fc99e Initial load
duke
parents:
diff changeset
487 // The second disjunct in the assertion below makes a concession
a61af66fc99e Initial load
duke
parents:
diff changeset
488 // for the start-up verification done while the VM is being
a61af66fc99e Initial load
duke
parents:
diff changeset
489 // created. Callers be careful that you know that mutators
a61af66fc99e Initial load
duke
parents:
diff changeset
490 // aren't going to interfere -- for instance, this is permissible
a61af66fc99e Initial load
duke
parents:
diff changeset
491 // if we are still single-threaded and have either not yet
a61af66fc99e Initial load
duke
parents:
diff changeset
492 // started allocating (nothing much to verify) or we have
a61af66fc99e Initial load
duke
parents:
diff changeset
493 // started allocating but are now a full-fledged JavaThread
a61af66fc99e Initial load
duke
parents:
diff changeset
494 // (and have thus made our TLAB's) available for filling.
a61af66fc99e Initial load
duke
parents:
diff changeset
495 assert(SafepointSynchronize::is_at_safepoint() ||
a61af66fc99e Initial load
duke
parents:
diff changeset
496 !is_init_completed(),
a61af66fc99e Initial load
duke
parents:
diff changeset
497 "Should only be called at a safepoint or at start-up"
a61af66fc99e Initial load
duke
parents:
diff changeset
498 " otherwise concurrent mutator activity may make heap "
a61af66fc99e Initial load
duke
parents:
diff changeset
499 " unparsable again");
1166
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
500 const bool use_tlab = UseTLAB;
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
501 const bool deferred = _defer_initial_card_mark;
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
502 // The main thread starts allocating via a TLAB even before it
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
503 // has added itself to the threads list at vm boot-up.
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
504 assert(!use_tlab || Threads::first() != NULL,
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
505 "Attempt to fill tlabs before main thread has been added"
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
506 " to threads list is doomed to failure!");
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
507 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) {
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
508 if (use_tlab) thread->tlab().make_parsable(retire_tlabs);
12498
d00c31d8394f Flush deferred barrier when Graal and G1 are used
Christos Kotselidis <christos.kotselidis@oracle.com>
parents: 12375
diff changeset
509 #if defined(COMPILER2) || defined(GRAAL)
1166
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
510 // The deferred store barriers must all have been flushed to the
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
511 // card-table (or other remembered set structure) before GC starts
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
512 // processing the card-table (or other remembered set).
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
513 if (deferred) flush_deferred_store_barrier(thread);
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
514 #else
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
515 assert(!deferred, "Should be false");
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
516 assert(thread->deferred_card_mark().is_empty(), "Should be empty");
7b0e9cba0307 6896647: card marks can be deferred too long
ysr
parents: 1165
diff changeset
517 #endif
0
a61af66fc99e Initial load
duke
parents:
diff changeset
518 }
a61af66fc99e Initial load
duke
parents:
diff changeset
519 }
a61af66fc99e Initial load
duke
parents:
diff changeset
520
a61af66fc99e Initial load
duke
parents:
diff changeset
521 void CollectedHeap::accumulate_statistics_all_tlabs() {
a61af66fc99e Initial load
duke
parents:
diff changeset
522 if (UseTLAB) {
a61af66fc99e Initial load
duke
parents:
diff changeset
523 assert(SafepointSynchronize::is_at_safepoint() ||
a61af66fc99e Initial load
duke
parents:
diff changeset
524 !is_init_completed(),
a61af66fc99e Initial load
duke
parents:
diff changeset
525 "should only accumulate statistics on tlabs at safepoint");
a61af66fc99e Initial load
duke
parents:
diff changeset
526
a61af66fc99e Initial load
duke
parents:
diff changeset
527 ThreadLocalAllocBuffer::accumulate_statistics_before_gc();
a61af66fc99e Initial load
duke
parents:
diff changeset
528 }
a61af66fc99e Initial load
duke
parents:
diff changeset
529 }
a61af66fc99e Initial load
duke
parents:
diff changeset
530
a61af66fc99e Initial load
duke
parents:
diff changeset
531 void CollectedHeap::resize_all_tlabs() {
a61af66fc99e Initial load
duke
parents:
diff changeset
532 if (UseTLAB) {
a61af66fc99e Initial load
duke
parents:
diff changeset
533 assert(SafepointSynchronize::is_at_safepoint() ||
a61af66fc99e Initial load
duke
parents:
diff changeset
534 !is_init_completed(),
a61af66fc99e Initial load
duke
parents:
diff changeset
535 "should only resize tlabs at safepoint");
a61af66fc99e Initial load
duke
parents:
diff changeset
536
a61af66fc99e Initial load
duke
parents:
diff changeset
537 ThreadLocalAllocBuffer::resize_all_tlabs();
a61af66fc99e Initial load
duke
parents:
diff changeset
538 }
a61af66fc99e Initial load
duke
parents:
diff changeset
539 }
615
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
540
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 7180
diff changeset
541 void CollectedHeap::pre_full_gc_dump(GCTimer* timer) {
615
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
542 if (HeapDumpBeforeFullGC) {
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 7180
diff changeset
543 GCTraceTime tt("Heap Dump (before full gc): ", PrintGCDetails, false, timer);
615
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
544 // We are doing a "major" collection and a heap dump before
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
545 // major collection has been requested.
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
546 HeapDumper::dump_heap();
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
547 }
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
548 if (PrintClassHistogramBeforeFullGC) {
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 7180
diff changeset
549 GCTraceTime tt("Class Histogram (before full gc): ", PrintGCDetails, true, timer);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 7180
diff changeset
550 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */);
615
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
551 inspector.doit();
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
552 }
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
553 }
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
554
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 7180
diff changeset
555 void CollectedHeap::post_full_gc_dump(GCTimer* timer) {
615
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
556 if (HeapDumpAfterFullGC) {
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 7180
diff changeset
557 GCTraceTime tt("Heap Dump (after full gc): ", PrintGCDetails, false, timer);
615
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
558 HeapDumper::dump_heap();
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
559 }
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
560 if (PrintClassHistogramAfterFullGC) {
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 7180
diff changeset
561 GCTraceTime tt("Class Histogram (after full gc): ", PrintGCDetails, true, timer);
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 7180
diff changeset
562 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */);
615
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
563 inspector.doit();
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
564 }
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents: 494
diff changeset
565 }
4009
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
566
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
567 oop CollectedHeap::Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS) {
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
568 debug_only(check_for_valid_allocation_state());
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
569 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
570 assert(size >= 0, "int won't convert to size_t");
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
571 HeapWord* obj;
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
572 assert(ScavengeRootsInCode > 0, "must be");
10405
f2110083203d 8005849: JEP 167: Event-Based JVM Tracing
sla
parents: 7180
diff changeset
573 obj = common_mem_allocate_init(real_klass, size, CHECK_NULL);
5972
9a9bb0010c91 7156764: Remove unused size parameter from some CollectedHeap methods
brutisso
parents: 5965
diff changeset
574 post_allocation_setup_common(klass, obj);
4009
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
575 assert(Universe::is_bootstrapping() ||
6725
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 5972
diff changeset
576 !((oop)obj)->is_array(), "must not be an array");
4009
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
577 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
578 oop mirror = (oop)obj;
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
579
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
580 java_lang_Class::set_oop_size(mirror, size);
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
581
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
582 // Setup indirections
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
583 if (!real_klass.is_null()) {
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
584 java_lang_Class::set_klass(mirror, real_klass());
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
585 real_klass->set_java_mirror(mirror);
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
586 }
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
587
6735
aed758eda82a 7195833: NPG: Rename instanceClassLoaderKlass, instanceRefKlass and instanceMirrorKlass
coleenp
parents: 6725
diff changeset
588 InstanceMirrorKlass* mk = InstanceMirrorKlass::cast(mirror->klass());
4009
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
589 assert(size == mk->instance_size(real_klass), "should have been set");
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
590
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
591 // notify jvmti and dtrace
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
592 post_allocation_notify(klass, (oop)obj);
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
593
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
594 return mirror;
e5928e7dab26 7098528: crash with java -XX:+ExtendedDTraceProbes
never
parents: 3960
diff changeset
595 }
4708
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
596
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
597 /////////////// Unit tests ///////////////
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
598
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
599 #ifndef PRODUCT
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
600 void CollectedHeap::test_is_in() {
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
601 CollectedHeap* heap = Universe::heap();
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
602
4746
b6a04c79ccbc 7125503: Compiling collectedHeap.cpp fails with -Werror=int-to-pointer-cast with g++ 4.6.1
stefank
parents: 4708
diff changeset
603 uintptr_t epsilon = (uintptr_t) MinObjAlignment;
b6a04c79ccbc 7125503: Compiling collectedHeap.cpp fails with -Werror=int-to-pointer-cast with g++ 4.6.1
stefank
parents: 4708
diff changeset
604 uintptr_t heap_start = (uintptr_t) heap->_reserved.start();
b6a04c79ccbc 7125503: Compiling collectedHeap.cpp fails with -Werror=int-to-pointer-cast with g++ 4.6.1
stefank
parents: 4708
diff changeset
605 uintptr_t heap_end = (uintptr_t) heap->_reserved.end();
b6a04c79ccbc 7125503: Compiling collectedHeap.cpp fails with -Werror=int-to-pointer-cast with g++ 4.6.1
stefank
parents: 4708
diff changeset
606
4708
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
607 // Test that NULL is not in the heap.
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
608 assert(!heap->is_in(NULL), "NULL is unexpectedly in the heap");
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
609
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
610 // Test that a pointer to before the heap start is reported as outside the heap.
4746
b6a04c79ccbc 7125503: Compiling collectedHeap.cpp fails with -Werror=int-to-pointer-cast with g++ 4.6.1
stefank
parents: 4708
diff changeset
611 assert(heap_start >= ((uintptr_t)NULL + epsilon), "sanity");
b6a04c79ccbc 7125503: Compiling collectedHeap.cpp fails with -Werror=int-to-pointer-cast with g++ 4.6.1
stefank
parents: 4708
diff changeset
612 void* before_heap = (void*)(heap_start - epsilon);
4708
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
613 assert(!heap->is_in(before_heap),
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
614 err_msg("before_heap: " PTR_FORMAT " is unexpectedly in the heap", before_heap));
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
615
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
616 // Test that a pointer to after the heap end is reported as outside the heap.
4746
b6a04c79ccbc 7125503: Compiling collectedHeap.cpp fails with -Werror=int-to-pointer-cast with g++ 4.6.1
stefank
parents: 4708
diff changeset
617 assert(heap_end <= ((uintptr_t)-1 - epsilon), "sanity");
b6a04c79ccbc 7125503: Compiling collectedHeap.cpp fails with -Werror=int-to-pointer-cast with g++ 4.6.1
stefank
parents: 4708
diff changeset
618 void* after_heap = (void*)(heap_end + epsilon);
4708
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
619 assert(!heap->is_in(after_heap),
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
620 err_msg("after_heap: " PTR_FORMAT " is unexpectedly in the heap", after_heap));
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
621 }
3c648b9ad052 7121373: Clean up CollectedHeap::is_in
stefank
parents: 4009
diff changeset
622 #endif