Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp @ 20445:e5668dcf12e9
8057818: collect allocation context statistics at gc pauses
Reviewed-by: mikael, jmasa
| author | jcoomes |
|---|---|
| date | Wed, 10 Sep 2014 13:01:13 -0700 |
| parents | 1f1d373cd044 |
| children | e7d0505c8a30 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 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. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 20337 | 26 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
| 1972 | 27 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
| 28 #include "gc_implementation/g1/heapRegion.hpp" | |
| 29 #include "gc_implementation/g1/satbQueue.hpp" | |
| 30 #include "runtime/mutexLocker.hpp" | |
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31 #include "runtime/orderAccess.inline.hpp" |
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32 #include "runtime/thread.inline.hpp" |
| 342 | 33 |
| 34 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap, | |
| 35 int max_covered_regions) : | |
| 36 CardTableModRefBSForCTRS(whole_heap, max_covered_regions) | |
| 37 { | |
| 38 _kind = G1SATBCT; | |
| 39 } | |
| 40 | |
| 41 void G1SATBCardTableModRefBS::enqueue(oop pre_val) { | |
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42 // Nulls should have been already filtered. |
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43 assert(pre_val->is_oop(true), "Error"); |
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44 |
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45 if (!JavaThread::satb_mark_queue_set().is_active()) return; |
| 342 | 46 Thread* thr = Thread::current(); |
| 47 if (thr->is_Java_thread()) { | |
| 48 JavaThread* jt = (JavaThread*)thr; | |
| 49 jt->satb_mark_queue().enqueue(pre_val); | |
| 50 } else { | |
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51 MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag); |
| 342 | 52 JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val); |
| 53 } | |
| 54 } | |
| 55 | |
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56 template <class T> void |
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57 G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) { |
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58 if (!JavaThread::satb_mark_queue_set().is_active()) return; |
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59 T* elem_ptr = dst; |
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60 for (int i = 0; i < count; i++, elem_ptr++) { |
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61 T heap_oop = oopDesc::load_heap_oop(elem_ptr); |
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62 if (!oopDesc::is_null(heap_oop)) { |
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63 enqueue(oopDesc::decode_heap_oop_not_null(heap_oop)); |
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64 } |
| 342 | 65 } |
| 66 } | |
| 67 | |
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68 void G1SATBCardTableModRefBS::write_ref_array_pre(oop* dst, int count, bool dest_uninitialized) { |
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69 if (!dest_uninitialized) { |
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70 write_ref_array_pre_work(dst, count); |
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71 } |
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72 } |
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73 void G1SATBCardTableModRefBS::write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized) { |
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74 if (!dest_uninitialized) { |
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75 write_ref_array_pre_work(dst, count); |
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76 } |
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77 } |
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78 |
| 12343 | 79 bool G1SATBCardTableModRefBS::mark_card_deferred(size_t card_index) { |
| 80 jbyte val = _byte_map[card_index]; | |
| 81 // It's already processed | |
| 82 if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) { | |
| 83 return false; | |
| 84 } | |
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85 |
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86 if (val == g1_young_gen) { |
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87 // the card is for a young gen region. We don't need to keep track of all pointers into young |
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88 return false; |
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89 } |
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90 |
| 12343 | 91 // Cached bit can be installed either on a clean card or on a claimed card. |
| 92 jbyte new_val = val; | |
| 93 if (val == clean_card_val()) { | |
| 94 new_val = (jbyte)deferred_card_val(); | |
| 95 } else { | |
| 96 if (val & claimed_card_val()) { | |
| 97 new_val = val | (jbyte)deferred_card_val(); | |
| 98 } | |
| 99 } | |
| 100 if (new_val != val) { | |
| 101 Atomic::cmpxchg(new_val, &_byte_map[card_index], val); | |
| 102 } | |
| 103 return true; | |
| 104 } | |
| 105 | |
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106 void G1SATBCardTableModRefBS::g1_mark_as_young(const MemRegion& mr) { |
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107 jbyte *const first = byte_for(mr.start()); |
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108 jbyte *const last = byte_after(mr.last()); |
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109 |
| 17951 | 110 // Below we may use an explicit loop instead of memset() because on |
| 111 // certain platforms memset() can give concurrent readers phantom zeros. | |
| 112 if (UseMemSetInBOT) { | |
| 113 memset(first, g1_young_gen, last - first); | |
| 114 } else { | |
| 115 for (jbyte* i = first; i < last; i++) { | |
| 116 *i = g1_young_gen; | |
| 117 } | |
| 118 } | |
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119 } |
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120 |
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121 #ifndef PRODUCT |
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122 void G1SATBCardTableModRefBS::verify_g1_young_region(MemRegion mr) { |
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123 verify_region(mr, g1_young_gen, true); |
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124 } |
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125 #endif |
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126 |
| 20337 | 127 void G1SATBCardTableLoggingModRefBSChangedListener::on_commit(uint start_idx, size_t num_regions) { |
| 128 MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_idx), num_regions * HeapRegion::GrainWords); | |
| 129 _card_table->clear(mr); | |
| 130 } | |
| 131 | |
| 342 | 132 G1SATBCardTableLoggingModRefBS:: |
| 133 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, | |
| 134 int max_covered_regions) : | |
| 135 G1SATBCardTableModRefBS(whole_heap, max_covered_regions), | |
| 20337 | 136 _dcqs(JavaThread::dirty_card_queue_set()), |
| 137 _listener() | |
| 342 | 138 { |
| 139 _kind = G1SATBCTLogging; | |
| 20337 | 140 _listener.set_card_table(this); |
| 141 } | |
| 142 | |
| 143 void G1SATBCardTableLoggingModRefBS::initialize(G1RegionToSpaceMapper* mapper) { | |
| 144 mapper->set_mapping_changed_listener(&_listener); | |
| 145 | |
| 146 _byte_map_size = mapper->reserved().byte_size(); | |
| 147 | |
| 148 _guard_index = cards_required(_whole_heap.word_size()) - 1; | |
| 149 _last_valid_index = _guard_index - 1; | |
| 150 | |
| 151 HeapWord* low_bound = _whole_heap.start(); | |
| 152 HeapWord* high_bound = _whole_heap.end(); | |
| 153 | |
| 154 _cur_covered_regions = 1; | |
| 155 _covered[0] = _whole_heap; | |
| 156 | |
| 157 _byte_map = (jbyte*) mapper->reserved().start(); | |
| 158 byte_map_base = _byte_map - (uintptr_t(low_bound) >> card_shift); | |
| 159 assert(byte_for(low_bound) == &_byte_map[0], "Checking start of map"); | |
| 160 assert(byte_for(high_bound-1) <= &_byte_map[_last_valid_index], "Checking end of map"); | |
| 161 | |
| 162 if (TraceCardTableModRefBS) { | |
| 163 gclog_or_tty->print_cr("G1SATBCardTableModRefBS::G1SATBCardTableModRefBS: "); | |
| 164 gclog_or_tty->print_cr(" " | |
| 165 " &_byte_map[0]: " INTPTR_FORMAT | |
| 166 " &_byte_map[_last_valid_index]: " INTPTR_FORMAT, | |
| 167 p2i(&_byte_map[0]), | |
| 168 p2i(&_byte_map[_last_valid_index])); | |
| 169 gclog_or_tty->print_cr(" " | |
| 170 " byte_map_base: " INTPTR_FORMAT, | |
| 171 p2i(byte_map_base)); | |
| 172 } | |
| 342 | 173 } |
| 174 | |
| 175 void | |
| 176 G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field, | |
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177 oop new_val, |
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178 bool release) { |
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179 volatile jbyte* byte = byte_for(field); |
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180 if (*byte == g1_young_gen) { |
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181 return; |
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182 } |
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183 OrderAccess::storeload(); |
| 342 | 184 if (*byte != dirty_card) { |
| 185 *byte = dirty_card; | |
| 186 Thread* thr = Thread::current(); | |
| 187 if (thr->is_Java_thread()) { | |
| 188 JavaThread* jt = (JavaThread*)thr; | |
| 189 jt->dirty_card_queue().enqueue(byte); | |
| 190 } else { | |
| 191 MutexLockerEx x(Shared_DirtyCardQ_lock, | |
| 192 Mutex::_no_safepoint_check_flag); | |
| 193 _dcqs.shared_dirty_card_queue()->enqueue(byte); | |
| 194 } | |
| 195 } | |
| 196 } | |
| 197 | |
| 198 void | |
| 199 G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field, | |
| 200 oop new_val) { | |
| 201 uintptr_t field_uint = (uintptr_t)field; | |
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202 uintptr_t new_val_uint = cast_from_oop<uintptr_t>(new_val); |
| 342 | 203 uintptr_t comb = field_uint ^ new_val_uint; |
| 204 comb = comb >> HeapRegion::LogOfHRGrainBytes; | |
| 205 if (comb == 0) return; | |
| 206 if (new_val == NULL) return; | |
| 207 // Otherwise, log it. | |
| 208 G1SATBCardTableLoggingModRefBS* g1_bs = | |
| 209 (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set(); | |
| 210 g1_bs->write_ref_field_work(field, new_val); | |
| 211 } | |
| 212 | |
| 213 void | |
| 214 G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) { | |
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215 volatile jbyte* byte = byte_for(mr.start()); |
| 342 | 216 jbyte* last_byte = byte_for(mr.last()); |
| 217 Thread* thr = Thread::current(); | |
| 218 if (whole_heap) { | |
| 219 while (byte <= last_byte) { | |
| 220 *byte = dirty_card; | |
| 221 byte++; | |
| 222 } | |
| 223 } else { | |
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224 // skip all consecutive young cards |
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225 for (; byte <= last_byte && *byte == g1_young_gen; byte++); |
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226 |
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227 if (byte <= last_byte) { |
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228 OrderAccess::storeload(); |
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229 // Enqueue if necessary. |
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230 if (thr->is_Java_thread()) { |
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231 JavaThread* jt = (JavaThread*)thr; |
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232 for (; byte <= last_byte; byte++) { |
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233 if (*byte == g1_young_gen) { |
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234 continue; |
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235 } |
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236 if (*byte != dirty_card) { |
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237 *byte = dirty_card; |
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238 jt->dirty_card_queue().enqueue(byte); |
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239 } |
| 342 | 240 } |
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241 } else { |
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242 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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243 Mutex::_no_safepoint_check_flag); |
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244 for (; byte <= last_byte; byte++) { |
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245 if (*byte == g1_young_gen) { |
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8014555: G1: Memory ordering problem with Conc refinement and card marking
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246 continue; |
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8014555: G1: Memory ordering problem with Conc refinement and card marking
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247 } |
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8014555: G1: Memory ordering problem with Conc refinement and card marking
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248 if (*byte != dirty_card) { |
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8014555: G1: Memory ordering problem with Conc refinement and card marking
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249 *byte = dirty_card; |
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250 _dcqs.shared_dirty_card_queue()->enqueue(byte); |
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8014555: G1: Memory ordering problem with Conc refinement and card marking
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251 } |
| 342 | 252 } |
| 253 } | |
| 254 } | |
| 255 } | |
| 256 } |