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annotate src/share/vm/gc_interface/collectedHeap.cpp @ 1027:39b01ab7035a

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6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning 6889757: G1: enable card mark elision for initializing writes from compiled code (ReduceInitialCardMarks) Summary: Defer the (compiler-elided) card-mark upon a slow-path allocation until after the store and before the next subsequent safepoint; G1 now answers yes to can_elide_tlab_write_barriers(). Reviewed-by: jcoomes, kvn, never
author ysr
date Fri, 16 Oct 2009 02:05:46 -0700
parents 7bb995fbd3c0
children 4ce7240d622c
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1 /*
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2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_collectedHeap.cpp.incl"
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27
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28
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29 #ifdef ASSERT
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30 int CollectedHeap::_fire_out_of_memory_count = 0;
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31 #endif
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32
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33 size_t CollectedHeap::_filler_array_max_size = 0;
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34
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35 // Memory state functions.
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36
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37 CollectedHeap::CollectedHeap()
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38 {
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39 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT));
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40 const size_t elements_per_word = HeapWordSize / sizeof(jint);
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41 _filler_array_max_size = align_object_size(filler_array_hdr_size() +
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42 max_len * elements_per_word);
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43
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44 _barrier_set = NULL;
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45 _is_gc_active = false;
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46 _total_collections = _total_full_collections = 0;
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47 _gc_cause = _gc_lastcause = GCCause::_no_gc;
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48 NOT_PRODUCT(_promotion_failure_alot_count = 0;)
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49 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;)
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50
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51 if (UsePerfData) {
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52 EXCEPTION_MARK;
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53
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54 // create the gc cause jvmstat counters
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55 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause",
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56 80, GCCause::to_string(_gc_cause), CHECK);
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57
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58 _perf_gc_lastcause =
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59 PerfDataManager::create_string_variable(SUN_GC, "lastCause",
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60 80, GCCause::to_string(_gc_lastcause), CHECK);
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61 }
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62 }
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63
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64
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65 #ifndef PRODUCT
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66 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) {
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67 if (CheckMemoryInitialization && ZapUnusedHeapArea) {
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68 for (size_t slot = 0; slot < size; slot += 1) {
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69 assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal),
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70 "Found badHeapWordValue in post-allocation check");
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71 }
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72 }
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73 }
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74
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75 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size)
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76 {
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77 if (CheckMemoryInitialization && ZapUnusedHeapArea) {
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78 for (size_t slot = 0; slot < size; slot += 1) {
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79 assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal),
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80 "Found non badHeapWordValue in pre-allocation check");
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81 }
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82 }
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83 }
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84 #endif // PRODUCT
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85
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86 #ifdef ASSERT
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87 void CollectedHeap::check_for_valid_allocation_state() {
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88 Thread *thread = Thread::current();
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89 // How to choose between a pending exception and a potential
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90 // OutOfMemoryError? Don't allow pending exceptions.
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91 // This is a VM policy failure, so how do we exhaustively test it?
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92 assert(!thread->has_pending_exception(),
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93 "shouldn't be allocating with pending exception");
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94 if (StrictSafepointChecks) {
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95 assert(thread->allow_allocation(),
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96 "Allocation done by thread for which allocation is blocked "
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97 "by No_Allocation_Verifier!");
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98 // Allocation of an oop can always invoke a safepoint,
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99 // hence, the true argument
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100 thread->check_for_valid_safepoint_state(true);
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101 }
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102 }
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103 #endif
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104
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105 HeapWord* CollectedHeap::allocate_from_tlab_slow(Thread* thread, size_t size) {
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106
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107 // Retain tlab and allocate object in shared space if
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108 // the amount free in the tlab is too large to discard.
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109 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) {
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110 thread->tlab().record_slow_allocation(size);
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111 return NULL;
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112 }
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113
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114 // Discard tlab and allocate a new one.
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115 // To minimize fragmentation, the last TLAB may be smaller than the rest.
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116 size_t new_tlab_size = thread->tlab().compute_size(size);
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117
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118 thread->tlab().clear_before_allocation();
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119
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120 if (new_tlab_size == 0) {
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121 return NULL;
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122 }
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123
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124 // Allocate a new TLAB...
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125 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size);
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126 if (obj == NULL) {
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127 return NULL;
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128 }
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129 if (ZeroTLAB) {
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130 // ..and clear it.
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131 Copy::zero_to_words(obj, new_tlab_size);
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132 } else {
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133 // ...and clear just the allocated object.
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134 Copy::zero_to_words(obj, size);
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135 }
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136 thread->tlab().fill(obj, obj + size, new_tlab_size);
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137 return obj;
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138 }
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139
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140 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) {
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141 MemRegion deferred = thread->deferred_card_mark();
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142 if (!deferred.is_empty()) {
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143 {
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144 // Verify that the storage points to a parsable object in heap
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145 DEBUG_ONLY(oop old_obj = oop(deferred.start());)
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146 assert(is_in(old_obj), "Not in allocated heap");
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147 assert(!can_elide_initializing_store_barrier(old_obj),
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148 "Else should have been filtered in defer_store_barrier()");
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149 assert(!is_in_permanent(old_obj), "Sanity: not expected");
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150 assert(old_obj->is_oop(true), "Not an oop");
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151 assert(old_obj->is_parsable(), "Will not be concurrently parsable");
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152 assert(deferred.word_size() == (size_t)(old_obj->size()),
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153 "Mismatch: multiple objects?");
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154 }
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155 BarrierSet* bs = barrier_set();
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156 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet");
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157 bs->write_region(deferred);
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158 // "Clear" the deferred_card_mark field
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159 thread->set_deferred_card_mark(MemRegion());
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160 }
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161 assert(thread->deferred_card_mark().is_empty(), "invariant");
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162 }
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163
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164 // Helper for ReduceInitialCardMarks. For performance,
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165 // compiled code may elide card-marks for initializing stores
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166 // to a newly allocated object along the fast-path. We
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167 // compensate for such elided card-marks as follows:
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168 // (a) Generational, non-concurrent collectors, such as
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169 // GenCollectedHeap(ParNew,DefNew,Tenured) and
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170 // ParallelScavengeHeap(ParallelGC, ParallelOldGC)
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171 // need the card-mark if and only if the region is
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172 // in the old gen, and do not care if the card-mark
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173 // succeeds or precedes the initializing stores themselves,
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174 // so long as the card-mark is completed before the next
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175 // scavenge. For all these cases, we can do a card mark
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176 // at the point at which we do a slow path allocation
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177 // in the old gen. For uniformity, however, we end
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178 // up using the same scheme (see below) for all three
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179 // cases (deferring the card-mark appropriately).
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180 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires
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181 // in addition that the card-mark for an old gen allocated
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182 // object strictly follow any associated initializing stores.
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183 // In these cases, the memRegion remembered below is
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184 // used to card-mark the entire region either just before the next
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185 // slow-path allocation by this thread or just before the next scavenge or
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186 // CMS-associated safepoint, whichever of these events happens first.
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187 // (The implicit assumption is that the object has been fully
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188 // initialized by this point, a fact that we assert when doing the
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189 // card-mark.)
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190 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a
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191 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is
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192 // is used to remember the pre-value of any store. Initializing
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193 // stores will not need this barrier, so we need not worry about
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194 // compensating for the missing pre-barrier here. Turning now
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195 // to the post-barrier, we note that G1 needs a RS update barrier
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196 // which simply enqueues a (sequence of) dirty cards which may
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197 // optionally be refined by the concurrent update threads. Note
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198 // that this barrier need only be applied to a non-young write,
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199 // but, like in CMS, because of the presence of concurrent refinement
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200 // (much like CMS' precleaning), must strictly follow the oop-store.
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201 // Thus, using the same protocol for maintaining the intended
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202 // invariants turns out, serendepitously, to be the same for all
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203 // three collectors/heap types above.
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204 //
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205 // For each future collector, this should be reexamined with
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206 // that specific collector in mind.
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207 oop CollectedHeap::defer_store_barrier(JavaThread* thread, oop new_obj) {
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208 // If a previous card-mark was deferred, flush it now.
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209 flush_deferred_store_barrier(thread);
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210 if (can_elide_initializing_store_barrier(new_obj)) {
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211 // The deferred_card_mark region should be empty
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212 // following the flush above.
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213 assert(thread->deferred_card_mark().is_empty(), "Error");
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214 } else {
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215 // Remember info for the newly deferred store barrier
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216 MemRegion deferred = MemRegion((HeapWord*)new_obj, new_obj->size());
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217 assert(!deferred.is_empty(), "Error");
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218 thread->set_deferred_card_mark(deferred);
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219 }
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220 return new_obj;
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221 }
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222
481
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223 size_t CollectedHeap::filler_array_hdr_size() {
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224 return size_t(arrayOopDesc::header_size(T_INT));
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225 }
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226
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227 size_t CollectedHeap::filler_array_min_size() {
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228 return align_object_size(filler_array_hdr_size());
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229 }
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230
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231 size_t CollectedHeap::filler_array_max_size() {
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232 return _filler_array_max_size;
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233 }
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234
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235 #ifdef ASSERT
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236 void CollectedHeap::fill_args_check(HeapWord* start, size_t words)
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237 {
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238 assert(words >= min_fill_size(), "too small to fill");
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239 assert(words % MinObjAlignment == 0, "unaligned size");
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240 assert(Universe::heap()->is_in_reserved(start), "not in heap");
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241 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap");
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242 }
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243
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244 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words)
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245 {
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246 if (ZapFillerObjects) {
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247 Copy::fill_to_words(start + filler_array_hdr_size(),
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248 words - filler_array_hdr_size(), 0XDEAFBABE);
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249 }
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250 }
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251 #endif // ASSERT
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252
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253 void
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254 CollectedHeap::fill_with_array(HeapWord* start, size_t words)
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255 {
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256 assert(words >= filler_array_min_size(), "too small for an array");
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257 assert(words <= filler_array_max_size(), "too big for a single object");
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258
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259 const size_t payload_size = words - filler_array_hdr_size();
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260 const size_t len = payload_size * HeapWordSize / sizeof(jint);
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261
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262 // Set the length first for concurrent GC.
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263 ((arrayOop)start)->set_length((int)len);
494
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264 post_allocation_setup_common(Universe::intArrayKlassObj(), start, words);
481
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265 DEBUG_ONLY(zap_filler_array(start, words);)
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266 }
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267
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268 void
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269 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words)
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270 {
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271 assert(words <= filler_array_max_size(), "too big for a single object");
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272
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273 if (words >= filler_array_min_size()) {
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274 fill_with_array(start, words);
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275 } else if (words > 0) {
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276 assert(words == min_fill_size(), "unaligned size");
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277 post_allocation_setup_common(SystemDictionary::object_klass(), start,
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278 words);
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279 }
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280 }
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281
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282 void CollectedHeap::fill_with_object(HeapWord* start, size_t words)
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283 {
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284 DEBUG_ONLY(fill_args_check(start, words);)
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285 HandleMark hm; // Free handles before leaving.
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286 fill_with_object_impl(start, words);
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287 }
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288
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289 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words)
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290 {
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291 DEBUG_ONLY(fill_args_check(start, words);)
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292 HandleMark hm; // Free handles before leaving.
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293
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294 #ifdef LP64
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295 // A single array can fill ~8G, so multiple objects are needed only in 64-bit.
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296 // First fill with arrays, ensuring that any remaining space is big enough to
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297 // fill. The remainder is filled with a single object.
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298 const size_t min = min_fill_size();
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299 const size_t max = filler_array_max_size();
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300 while (words > max) {
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301 const size_t cur = words - max >= min ? max : max - min;
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302 fill_with_array(start, cur);
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303 start += cur;
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304 words -= cur;
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305 }
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306 #endif
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307
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308 fill_with_object_impl(start, words);
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309 }
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310
0
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311 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) {
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312 guarantee(false, "thread-local allocation buffers not supported");
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313 return NULL;
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314 }
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315
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316 void CollectedHeap::fill_all_tlabs(bool retire) {
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317 assert(UseTLAB, "should not reach here");
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318 // See note in ensure_parsability() below.
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319 assert(SafepointSynchronize::is_at_safepoint() ||
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320 !is_init_completed(),
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321 "should only fill tlabs at safepoint");
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322 // The main thread starts allocating via a TLAB even before it
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323 // has added itself to the threads list at vm boot-up.
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324 assert(Threads::first() != NULL,
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325 "Attempt to fill tlabs before main thread has been added"
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326 " to threads list is doomed to failure!");
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327 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) {
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328 thread->tlab().make_parsable(retire);
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329 }
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330 }
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331
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332 void CollectedHeap::ensure_parsability(bool retire_tlabs) {
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333 // The second disjunct in the assertion below makes a concession
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334 // for the start-up verification done while the VM is being
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335 // created. Callers be careful that you know that mutators
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336 // aren't going to interfere -- for instance, this is permissible
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337 // if we are still single-threaded and have either not yet
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338 // started allocating (nothing much to verify) or we have
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339 // started allocating but are now a full-fledged JavaThread
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340 // (and have thus made our TLAB's) available for filling.
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341 assert(SafepointSynchronize::is_at_safepoint() ||
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342 !is_init_completed(),
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343 "Should only be called at a safepoint or at start-up"
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344 " otherwise concurrent mutator activity may make heap "
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345 " unparsable again");
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346 if (UseTLAB) {
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347 fill_all_tlabs(retire_tlabs);
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348 }
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349 }
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350
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351 void CollectedHeap::accumulate_statistics_all_tlabs() {
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352 if (UseTLAB) {
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353 assert(SafepointSynchronize::is_at_safepoint() ||
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354 !is_init_completed(),
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355 "should only accumulate statistics on tlabs at safepoint");
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356
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357 ThreadLocalAllocBuffer::accumulate_statistics_before_gc();
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358 }
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359 }
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360
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361 void CollectedHeap::resize_all_tlabs() {
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362 if (UseTLAB) {
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363 assert(SafepointSynchronize::is_at_safepoint() ||
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364 !is_init_completed(),
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365 "should only resize tlabs at safepoint");
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366
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367 ThreadLocalAllocBuffer::resize_all_tlabs();
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368 }
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369 }
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370
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371 void CollectedHeap::pre_full_gc_dump() {
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372 if (HeapDumpBeforeFullGC) {
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373 TraceTime tt("Heap Dump: ", PrintGCDetails, false, gclog_or_tty);
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374 // We are doing a "major" collection and a heap dump before
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375 // major collection has been requested.
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376 HeapDumper::dump_heap();
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377 }
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378 if (PrintClassHistogramBeforeFullGC) {
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379 TraceTime tt("Class Histogram: ", PrintGCDetails, true, gclog_or_tty);
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380 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */);
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381 inspector.doit();
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382 }
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383 }
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384
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385 void CollectedHeap::post_full_gc_dump() {
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386 if (HeapDumpAfterFullGC) {
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387 TraceTime tt("Heap Dump", PrintGCDetails, false, gclog_or_tty);
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388 HeapDumper::dump_heap();
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389 }
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390 if (PrintClassHistogramAfterFullGC) {
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391 TraceTime tt("Class Histogram", PrintGCDetails, true, gclog_or_tty);
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392 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */);
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393 inspector.doit();
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394 }
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395 }