author | rkennke |
Tue, 02 Apr 2019 18:13:42 +0200 | |
changeset 54383 | cdc3bb0983a6 |
parent 52925 | 9c18c9d839d3 |
child 54606 | 24eb7720919c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "gc/shenandoah/shenandoahCollectionSet.hpp" |
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#include "gc/shenandoah/shenandoahHeap.inline.hpp" |
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#include "gc/shenandoah/shenandoahHeapRegionSet.hpp" |
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#include "gc/shenandoah/shenandoahUtils.hpp" |
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#include "runtime/atomic.hpp" |
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#include "utilities/copy.hpp" |
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|
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ShenandoahCollectionSet::ShenandoahCollectionSet(ShenandoahHeap* heap, HeapWord* heap_base) : |
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_map_size(heap->num_regions()), |
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_region_size_bytes_shift(ShenandoahHeapRegion::region_size_bytes_shift()), |
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_cset_map(NEW_C_HEAP_ARRAY(jbyte, _map_size, mtGC)), |
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_biased_cset_map(_cset_map - ((uintx)heap_base >> _region_size_bytes_shift)), |
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_heap(heap), |
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_garbage(0), |
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_live_data(0), |
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_used(0), |
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_region_count(0), |
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_current_index(0) { |
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// Use 1-byte data type |
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STATIC_ASSERT(sizeof(jbyte) == 1); |
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// Initialize cset map |
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Copy::zero_to_bytes(_cset_map, _map_size); |
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} |
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|
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void ShenandoahCollectionSet::add_region(ShenandoahHeapRegion* r) { |
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assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint"); |
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assert(Thread::current()->is_VM_thread(), "Must be VMThread"); |
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assert(!is_in(r), "Already in collection set"); |
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_cset_map[r->region_number()] = 1; |
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_region_count ++; |
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_garbage += r->garbage(); |
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_live_data += r->get_live_data_bytes(); |
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_used += r->used(); |
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} |
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bool ShenandoahCollectionSet::add_region_check_for_duplicates(ShenandoahHeapRegion* r) { |
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if (!is_in(r)) { |
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add_region(r); |
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return true; |
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} else { |
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return false; |
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} |
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} |
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void ShenandoahCollectionSet::remove_region(ShenandoahHeapRegion* r) { |
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assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint"); |
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assert(Thread::current()->is_VM_thread(), "Must be VMThread"); |
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assert(is_in(r), "Not in collection set"); |
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_cset_map[r->region_number()] = 0; |
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_region_count --; |
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} |
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void ShenandoahCollectionSet::update_region_status() { |
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for (size_t index = 0; index < _heap->num_regions(); index ++) { |
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ShenandoahHeapRegion* r = _heap->get_region(index); |
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if (is_in(r)) { |
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r->make_cset(); |
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} else { |
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assert (!r->is_cset(), "should not be cset"); |
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} |
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} |
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} |
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void ShenandoahCollectionSet::clear() { |
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assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint"); |
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Copy::zero_to_bytes(_cset_map, _map_size); |
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#ifdef ASSERT |
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for (size_t index = 0; index < _heap->num_regions(); index ++) { |
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assert (!_heap->get_region(index)->is_cset(), "should have been cleared before"); |
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} |
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#endif |
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_garbage = 0; |
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_live_data = 0; |
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_used = 0; |
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_region_count = 0; |
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105 |
_current_index = 0; |
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106 |
} |
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107 |
|
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108 |
ShenandoahHeapRegion* ShenandoahCollectionSet::claim_next() { |
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109 |
size_t num_regions = _heap->num_regions(); |
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110 |
if (_current_index >= (jint)num_regions) { |
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111 |
return NULL; |
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112 |
} |
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113 |
|
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114 |
jint saved_current = _current_index; |
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115 |
size_t index = (size_t)saved_current; |
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116 |
|
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117 |
while(index < num_regions) { |
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118 |
if (is_in(index)) { |
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119 |
jint cur = Atomic::cmpxchg((jint)(index + 1), &_current_index, saved_current); |
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120 |
assert(cur >= (jint)saved_current, "Must move forward"); |
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121 |
if (cur == saved_current) { |
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122 |
assert(is_in(index), "Invariant"); |
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123 |
return _heap->get_region(index); |
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124 |
} else { |
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125 |
index = (size_t)cur; |
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126 |
saved_current = cur; |
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127 |
} |
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128 |
} else { |
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129 |
index ++; |
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130 |
} |
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131 |
} |
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132 |
return NULL; |
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133 |
} |
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134 |
|
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135 |
ShenandoahHeapRegion* ShenandoahCollectionSet::next() { |
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136 |
assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint"); |
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137 |
assert(Thread::current()->is_VM_thread(), "Must be VMThread"); |
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138 |
size_t num_regions = _heap->num_regions(); |
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139 |
for (size_t index = (size_t)_current_index; index < num_regions; index ++) { |
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140 |
if (is_in(index)) { |
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141 |
_current_index = (jint)(index + 1); |
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142 |
return _heap->get_region(index); |
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143 |
} |
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144 |
} |
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145 |
|
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146 |
return NULL; |
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147 |
} |
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148 |
|
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149 |
void ShenandoahCollectionSet::print_on(outputStream* out) const { |
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out->print_cr("Collection Set : " SIZE_FORMAT "", count()); |
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151 |
|
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152 |
debug_only(size_t regions = 0;) |
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153 |
for (size_t index = 0; index < _heap->num_regions(); index ++) { |
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154 |
if (is_in(index)) { |
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155 |
_heap->get_region(index)->print_on(out); |
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156 |
debug_only(regions ++;) |
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157 |
} |
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158 |
} |
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159 |
assert(regions == count(), "Must match"); |
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160 |
} |