Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 4910:caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
Summary: If we try to schedule an initial-mark GC in order to explicit start a conc mark cycle and it gets pre-empted by antoher GC, we should retry the attempt as long as it's appropriate for the GC cause.
Reviewed-by: brutisso, johnc
| author | tonyp |
|---|---|
| date | Tue, 14 Feb 2012 08:21:08 -0500 |
| parents | eff609af17d7 |
| children | 2a0172480595 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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" |
| 26 #include "classfile/symbolTable.hpp" | |
| 3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
| 1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
| 29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
| 3771 | 32 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
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34 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 35 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 36 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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37 #include "gc_implementation/shared/vmGCOperations.hpp" |
| 1972 | 38 #include "memory/genOopClosures.inline.hpp" |
| 39 #include "memory/referencePolicy.hpp" | |
| 40 #include "memory/resourceArea.hpp" | |
| 41 #include "oops/oop.inline.hpp" | |
| 42 #include "runtime/handles.inline.hpp" | |
| 43 #include "runtime/java.hpp" | |
| 342 | 44 |
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45 // Concurrent marking bit map wrapper |
| 342 | 46 |
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47 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
| 342 | 48 _bm((uintptr_t*)NULL,0), |
| 49 _shifter(shifter) { | |
| 50 _bmStartWord = (HeapWord*)(rs.base()); | |
| 51 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
| 52 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
| 53 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
| 54 | |
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55 guarantee(brs.is_reserved(), "couldn't allocate concurrent marking bit map"); |
| 342 | 56 // For now we'll just commit all of the bit map up fromt. |
| 57 // Later on we'll try to be more parsimonious with swap. | |
| 58 guarantee(_virtual_space.initialize(brs, brs.size()), | |
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59 "couldn't reseve backing store for concurrent marking bit map"); |
| 342 | 60 assert(_virtual_space.committed_size() == brs.size(), |
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61 "didn't reserve backing store for all of concurrent marking bit map?"); |
| 342 | 62 _bm.set_map((uintptr_t*)_virtual_space.low()); |
| 63 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
| 64 _bmWordSize, "inconsistency in bit map sizing"); | |
| 65 _bm.set_size(_bmWordSize >> _shifter); | |
| 66 } | |
| 67 | |
| 68 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
| 69 HeapWord* limit) const { | |
| 70 // First we must round addr *up* to a possible object boundary. | |
| 71 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
| 72 HeapWordSize << _shifter); | |
| 73 size_t addrOffset = heapWordToOffset(addr); | |
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74 if (limit == NULL) { |
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75 limit = _bmStartWord + _bmWordSize; |
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76 } |
| 342 | 77 size_t limitOffset = heapWordToOffset(limit); |
| 78 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
| 79 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 80 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 81 assert(nextAddr == limit || isMarked(nextAddr), | |
| 82 "get_next_one postcondition"); | |
| 83 return nextAddr; | |
| 84 } | |
| 85 | |
| 86 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
| 87 HeapWord* limit) const { | |
| 88 size_t addrOffset = heapWordToOffset(addr); | |
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89 if (limit == NULL) { |
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90 limit = _bmStartWord + _bmWordSize; |
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91 } |
| 342 | 92 size_t limitOffset = heapWordToOffset(limit); |
| 93 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
| 94 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 95 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 96 assert(nextAddr == limit || !isMarked(nextAddr), | |
| 97 "get_next_one postcondition"); | |
| 98 return nextAddr; | |
| 99 } | |
| 100 | |
| 101 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
| 102 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
| 103 return (int) (diff >> _shifter); | |
| 104 } | |
| 105 | |
| 106 void CMBitMapRO::mostly_disjoint_range_union(BitMap* from_bitmap, | |
| 107 size_t from_start_index, | |
| 108 HeapWord* to_start_word, | |
| 109 size_t word_num) { | |
| 110 _bm.mostly_disjoint_range_union(from_bitmap, | |
| 111 from_start_index, | |
| 112 heapWordToOffset(to_start_word), | |
| 113 word_num); | |
| 114 } | |
| 115 | |
| 116 #ifndef PRODUCT | |
| 117 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
| 118 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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119 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
| 342 | 120 "size inconsistency"); |
| 121 return _bmStartWord == (HeapWord*)(rs.base()) && | |
| 122 _bmWordSize == rs.size()>>LogHeapWordSize; | |
| 123 } | |
| 124 #endif | |
| 125 | |
| 126 void CMBitMap::clearAll() { | |
| 127 _bm.clear(); | |
| 128 return; | |
| 129 } | |
| 130 | |
| 131 void CMBitMap::markRange(MemRegion mr) { | |
| 132 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 133 assert(!mr.is_empty(), "unexpected empty region"); | |
| 134 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 135 ((HeapWord *) mr.end())), | |
| 136 "markRange memory region end is not card aligned"); | |
| 137 // convert address range into offset range | |
| 138 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 139 heapWordToOffset(mr.end()), true); | |
| 140 } | |
| 141 | |
| 142 void CMBitMap::clearRange(MemRegion mr) { | |
| 143 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 144 assert(!mr.is_empty(), "unexpected empty region"); | |
| 145 // convert address range into offset range | |
| 146 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 147 heapWordToOffset(mr.end()), false); | |
| 148 } | |
| 149 | |
| 150 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 151 HeapWord* end_addr) { | |
| 152 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 153 start = MIN2(start, end_addr); | |
| 154 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 155 end = MIN2(end, end_addr); | |
| 156 assert(start <= end, "Consistency check"); | |
| 157 MemRegion mr(start, end); | |
| 158 if (!mr.is_empty()) { | |
| 159 clearRange(mr); | |
| 160 } | |
| 161 return mr; | |
| 162 } | |
| 163 | |
| 164 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 165 _base(NULL), _cm(cm) | |
| 166 #ifdef ASSERT | |
| 167 , _drain_in_progress(false) | |
| 168 , _drain_in_progress_yields(false) | |
| 169 #endif | |
| 170 {} | |
| 171 | |
| 172 void CMMarkStack::allocate(size_t size) { | |
| 173 _base = NEW_C_HEAP_ARRAY(oop, size); | |
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174 if (_base == NULL) { |
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175 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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176 } |
| 342 | 177 _index = 0; |
| 178 _capacity = (jint) size; | |
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179 _saved_index = -1; |
| 342 | 180 NOT_PRODUCT(_max_depth = 0); |
| 181 } | |
| 182 | |
| 183 CMMarkStack::~CMMarkStack() { | |
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184 if (_base != NULL) { |
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185 FREE_C_HEAP_ARRAY(oop, _base); |
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186 } |
| 342 | 187 } |
| 188 | |
| 189 void CMMarkStack::par_push(oop ptr) { | |
| 190 while (true) { | |
| 191 if (isFull()) { | |
| 192 _overflow = true; | |
| 193 return; | |
| 194 } | |
| 195 // Otherwise... | |
| 196 jint index = _index; | |
| 197 jint next_index = index+1; | |
| 198 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 199 if (res == index) { | |
| 200 _base[index] = ptr; | |
| 201 // Note that we don't maintain this atomically. We could, but it | |
| 202 // doesn't seem necessary. | |
| 203 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 204 return; | |
| 205 } | |
| 206 // Otherwise, we need to try again. | |
| 207 } | |
| 208 } | |
| 209 | |
| 210 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 211 while (true) { | |
| 212 if (isFull()) { | |
| 213 _overflow = true; | |
| 214 return; | |
| 215 } | |
| 216 // Otherwise... | |
| 217 jint index = _index; | |
| 218 jint next_index = index + n; | |
| 219 if (next_index > _capacity) { | |
| 220 _overflow = true; | |
| 221 return; | |
| 222 } | |
| 223 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 224 if (res == index) { | |
| 225 for (int i = 0; i < n; i++) { | |
| 226 int ind = index + i; | |
| 227 assert(ind < _capacity, "By overflow test above."); | |
| 228 _base[ind] = ptr_arr[i]; | |
| 229 } | |
| 230 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 231 return; | |
| 232 } | |
| 233 // Otherwise, we need to try again. | |
| 234 } | |
| 235 } | |
| 236 | |
| 237 | |
| 238 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 239 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 240 jint start = _index; | |
| 241 jint next_index = start + n; | |
| 242 if (next_index > _capacity) { | |
| 243 _overflow = true; | |
| 244 return; | |
| 245 } | |
| 246 // Otherwise. | |
| 247 _index = next_index; | |
| 248 for (int i = 0; i < n; i++) { | |
| 249 int ind = start + i; | |
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250 assert(ind < _capacity, "By overflow test above."); |
| 342 | 251 _base[ind] = ptr_arr[i]; |
| 252 } | |
| 253 } | |
| 254 | |
| 255 | |
| 256 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 257 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 258 jint index = _index; | |
| 259 if (index == 0) { | |
| 260 *n = 0; | |
| 261 return false; | |
| 262 } else { | |
| 263 int k = MIN2(max, index); | |
| 264 jint new_ind = index - k; | |
| 265 for (int j = 0; j < k; j++) { | |
| 266 ptr_arr[j] = _base[new_ind + j]; | |
| 267 } | |
| 268 _index = new_ind; | |
| 269 *n = k; | |
| 270 return true; | |
| 271 } | |
| 272 } | |
| 273 | |
| 274 CMRegionStack::CMRegionStack() : _base(NULL) {} | |
| 275 | |
| 276 void CMRegionStack::allocate(size_t size) { | |
| 277 _base = NEW_C_HEAP_ARRAY(MemRegion, size); | |
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278 if (_base == NULL) { |
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279 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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280 } |
| 342 | 281 _index = 0; |
| 282 _capacity = (jint) size; | |
| 283 } | |
| 284 | |
| 285 CMRegionStack::~CMRegionStack() { | |
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286 if (_base != NULL) { |
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287 FREE_C_HEAP_ARRAY(oop, _base); |
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288 } |
| 342 | 289 } |
| 290 | |
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291 void CMRegionStack::push_lock_free(MemRegion mr) { |
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292 guarantee(false, "push_lock_free(): don't call this any more"); |
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293 |
| 342 | 294 assert(mr.word_size() > 0, "Precondition"); |
| 295 while (true) { | |
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296 jint index = _index; |
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297 |
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298 if (index >= _capacity) { |
| 342 | 299 _overflow = true; |
| 300 return; | |
| 301 } | |
| 302 // Otherwise... | |
| 303 jint next_index = index+1; | |
| 304 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 305 if (res == index) { | |
| 306 _base[index] = mr; | |
| 307 return; | |
| 308 } | |
| 309 // Otherwise, we need to try again. | |
| 310 } | |
| 311 } | |
| 312 | |
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313 // Lock-free pop of the region stack. Called during the concurrent |
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314 // marking / remark phases. Should only be called in tandem with |
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315 // other lock-free pops. |
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316 MemRegion CMRegionStack::pop_lock_free() { |
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317 guarantee(false, "pop_lock_free(): don't call this any more"); |
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318 |
| 342 | 319 while (true) { |
| 320 jint index = _index; | |
| 321 | |
| 322 if (index == 0) { | |
| 323 return MemRegion(); | |
| 324 } | |
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325 // Otherwise... |
| 342 | 326 jint next_index = index-1; |
| 327 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 328 if (res == index) { | |
| 329 MemRegion mr = _base[next_index]; | |
| 330 if (mr.start() != NULL) { | |
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331 assert(mr.end() != NULL, "invariant"); |
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332 assert(mr.word_size() > 0, "invariant"); |
| 342 | 333 return mr; |
| 334 } else { | |
| 335 // that entry was invalidated... let's skip it | |
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336 assert(mr.end() == NULL, "invariant"); |
| 342 | 337 } |
| 338 } | |
| 339 // Otherwise, we need to try again. | |
| 340 } | |
| 341 } | |
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342 |
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343 #if 0 |
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344 // The routines that manipulate the region stack with a lock are |
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345 // not currently used. They should be retained, however, as a |
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346 // diagnostic aid. |
|
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347 |
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348 void CMRegionStack::push_with_lock(MemRegion mr) { |
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349 assert(mr.word_size() > 0, "Precondition"); |
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350 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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351 |
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352 if (isFull()) { |
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353 _overflow = true; |
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354 return; |
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355 } |
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356 |
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357 _base[_index] = mr; |
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358 _index += 1; |
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359 } |
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360 |
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361 MemRegion CMRegionStack::pop_with_lock() { |
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362 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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363 |
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364 while (true) { |
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365 if (_index == 0) { |
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366 return MemRegion(); |
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367 } |
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368 _index -= 1; |
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369 |
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370 MemRegion mr = _base[_index]; |
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371 if (mr.start() != NULL) { |
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372 assert(mr.end() != NULL, "invariant"); |
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373 assert(mr.word_size() > 0, "invariant"); |
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374 return mr; |
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375 } else { |
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376 // that entry was invalidated... let's skip it |
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377 assert(mr.end() == NULL, "invariant"); |
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378 } |
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379 } |
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380 } |
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381 #endif |
| 342 | 382 |
| 383 bool CMRegionStack::invalidate_entries_into_cset() { | |
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384 guarantee(false, "invalidate_entries_into_cset(): don't call this any more"); |
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385 |
| 342 | 386 bool result = false; |
| 387 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 388 for (int i = 0; i < _oops_do_bound; ++i) { | |
| 389 MemRegion mr = _base[i]; | |
| 390 if (mr.start() != NULL) { | |
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391 assert(mr.end() != NULL, "invariant"); |
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392 assert(mr.word_size() > 0, "invariant"); |
| 342 | 393 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
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394 assert(hr != NULL, "invariant"); |
| 342 | 395 if (hr->in_collection_set()) { |
| 396 // The region points into the collection set | |
| 397 _base[i] = MemRegion(); | |
| 398 result = true; | |
| 399 } | |
| 400 } else { | |
| 401 // that entry was invalidated... let's skip it | |
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402 assert(mr.end() == NULL, "invariant"); |
| 342 | 403 } |
| 404 } | |
| 405 return result; | |
| 406 } | |
| 407 | |
| 408 template<class OopClosureClass> | |
| 409 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 410 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 411 || SafepointSynchronize::is_at_safepoint(), | |
| 412 "Drain recursion must be yield-safe."); | |
| 413 bool res = true; | |
| 414 debug_only(_drain_in_progress = true); | |
| 415 debug_only(_drain_in_progress_yields = yield_after); | |
| 416 while (!isEmpty()) { | |
| 417 oop newOop = pop(); | |
| 418 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 419 assert(newOop->is_oop(), "Expected an oop"); | |
| 420 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 421 "only grey objects on this stack"); | |
| 422 newOop->oop_iterate(cl); | |
| 423 if (yield_after && _cm->do_yield_check()) { | |
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424 res = false; |
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425 break; |
| 342 | 426 } |
| 427 } | |
| 428 debug_only(_drain_in_progress = false); | |
| 429 return res; | |
| 430 } | |
| 431 | |
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432 void CMMarkStack::note_start_of_gc() { |
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433 assert(_saved_index == -1, |
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434 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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435 _saved_index = _index; |
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436 } |
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437 |
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438 void CMMarkStack::note_end_of_gc() { |
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439 // This is intentionally a guarantee, instead of an assert. If we |
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440 // accidentally add something to the mark stack during GC, it |
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441 // will be a correctness issue so it's better if we crash. we'll |
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442 // only check this once per GC anyway, so it won't be a performance |
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443 // issue in any way. |
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444 guarantee(_saved_index == _index, |
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445 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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446 _saved_index = -1; |
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447 } |
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448 |
| 342 | 449 void CMMarkStack::oops_do(OopClosure* f) { |
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450 assert(_saved_index == _index, |
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451 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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452 for (int i = 0; i < _index; i += 1) { |
| 342 | 453 f->do_oop(&_base[i]); |
| 454 } | |
| 455 } | |
| 456 | |
| 457 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
| 458 return (_g1h->is_obj_ill(obj) | |
| 459 || (_g1h->is_in_permanent(obj) | |
| 460 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
| 461 } | |
| 462 | |
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463 CMRootRegions::CMRootRegions() : |
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464 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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465 _should_abort(false), _next_survivor(NULL) { } |
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466 |
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467 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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468 _young_list = g1h->young_list(); |
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469 _cm = cm; |
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470 } |
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471 |
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472 void CMRootRegions::prepare_for_scan() { |
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473 assert(!scan_in_progress(), "pre-condition"); |
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474 |
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475 // Currently, only survivors can be root regions. |
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476 assert(_next_survivor == NULL, "pre-condition"); |
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477 _next_survivor = _young_list->first_survivor_region(); |
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478 _scan_in_progress = (_next_survivor != NULL); |
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479 _should_abort = false; |
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480 } |
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481 |
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482 HeapRegion* CMRootRegions::claim_next() { |
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483 if (_should_abort) { |
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484 // If someone has set the should_abort flag, we return NULL to |
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485 // force the caller to bail out of their loop. |
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486 return NULL; |
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487 } |
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488 |
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489 // Currently, only survivors can be root regions. |
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490 HeapRegion* res = _next_survivor; |
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491 if (res != NULL) { |
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492 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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493 // Read it again in case it changed while we were waiting for the lock. |
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494 res = _next_survivor; |
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495 if (res != NULL) { |
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496 if (res == _young_list->last_survivor_region()) { |
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497 // We just claimed the last survivor so store NULL to indicate |
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498 // that we're done. |
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499 _next_survivor = NULL; |
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500 } else { |
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501 _next_survivor = res->get_next_young_region(); |
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502 } |
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503 } else { |
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504 // Someone else claimed the last survivor while we were trying |
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505 // to take the lock so nothing else to do. |
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506 } |
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507 } |
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508 assert(res == NULL || res->is_survivor(), "post-condition"); |
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509 |
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510 return res; |
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511 } |
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512 |
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513 void CMRootRegions::scan_finished() { |
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514 assert(scan_in_progress(), "pre-condition"); |
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515 |
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516 // Currently, only survivors can be root regions. |
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517 if (!_should_abort) { |
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518 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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519 } |
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520 _next_survivor = NULL; |
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521 |
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522 { |
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523 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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524 _scan_in_progress = false; |
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525 RootRegionScan_lock->notify_all(); |
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526 } |
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527 } |
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528 |
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529 bool CMRootRegions::wait_until_scan_finished() { |
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530 if (!scan_in_progress()) return false; |
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531 |
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532 { |
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533 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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534 while (scan_in_progress()) { |
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535 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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536 } |
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537 } |
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538 return true; |
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539 } |
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540 |
| 342 | 541 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 542 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 543 #endif // _MSC_VER | |
| 544 | |
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545 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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546 return MAX2((n_par_threads + 2) / 4, 1U); |
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547 } |
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548 |
| 342 | 549 ConcurrentMark::ConcurrentMark(ReservedSpace rs, |
| 550 int max_regions) : | |
| 551 _markBitMap1(rs, MinObjAlignment - 1), | |
| 552 _markBitMap2(rs, MinObjAlignment - 1), | |
| 553 | |
| 554 _parallel_marking_threads(0), | |
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555 _max_parallel_marking_threads(0), |
| 342 | 556 _sleep_factor(0.0), |
| 557 _marking_task_overhead(1.0), | |
| 558 _cleanup_sleep_factor(0.0), | |
| 559 _cleanup_task_overhead(1.0), | |
| 2152 | 560 _cleanup_list("Cleanup List"), |
| 342 | 561 _region_bm(max_regions, false /* in_resource_area*/), |
| 562 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
| 563 CardTableModRefBS::card_shift, | |
| 564 false /* in_resource_area*/), | |
|
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565 |
| 342 | 566 _prevMarkBitMap(&_markBitMap1), |
| 567 _nextMarkBitMap(&_markBitMap2), | |
| 568 _at_least_one_mark_complete(false), | |
| 569 | |
| 570 _markStack(this), | |
| 571 _regionStack(), | |
| 572 // _finger set in set_non_marking_state | |
| 573 | |
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574 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 575 // _active_tasks set in set_non_marking_state |
| 576 // _tasks set inside the constructor | |
| 577 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
| 578 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
| 579 | |
| 580 _has_overflown(false), | |
| 581 _concurrent(false), | |
|
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582 _has_aborted(false), |
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583 _restart_for_overflow(false), |
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584 _concurrent_marking_in_progress(false), |
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585 _should_gray_objects(false), |
| 342 | 586 |
| 587 // _verbose_level set below | |
| 588 | |
| 589 _init_times(), | |
| 590 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 591 _cleanup_times(), | |
| 592 _total_counting_time(0.0), | |
| 593 _total_rs_scrub_time(0.0), | |
|
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594 |
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595 _parallel_workers(NULL), |
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596 |
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597 _count_card_bitmaps(NULL), |
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598 _count_marked_bytes(NULL) { |
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599 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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600 if (verbose_level < no_verbose) { |
| 342 | 601 verbose_level = no_verbose; |
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602 } |
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603 if (verbose_level > high_verbose) { |
| 342 | 604 verbose_level = high_verbose; |
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605 } |
| 342 | 606 _verbose_level = verbose_level; |
| 607 | |
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608 if (verbose_low()) { |
| 342 | 609 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
| 610 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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611 } |
| 342 | 612 |
| 1284 | 613 _markStack.allocate(MarkStackSize); |
| 751 | 614 _regionStack.allocate(G1MarkRegionStackSize); |
| 342 | 615 |
| 616 // Create & start a ConcurrentMark thread. | |
|
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617 _cmThread = new ConcurrentMarkThread(this); |
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618 assert(cmThread() != NULL, "CM Thread should have been created"); |
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619 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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620 |
| 342 | 621 _g1h = G1CollectedHeap::heap(); |
| 622 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
| 623 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
| 624 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
| 625 | |
| 626 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 627 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 628 |
|
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629 _root_regions.init(_g1h, this); |
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630 |
| 342 | 631 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); |
| 632 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
| 633 | |
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634 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_task_num); |
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635 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_task_num); |
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636 |
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637 BitMap::idx_t card_bm_size = _card_bm.size(); |
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638 |
| 342 | 639 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
| 640 _active_tasks = _max_task_num; | |
| 641 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 642 CMTaskQueue* task_queue = new CMTaskQueue(); | |
| 643 task_queue->initialize(); | |
| 644 _task_queues->register_queue(i, task_queue); | |
| 645 | |
|
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646 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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647 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions); |
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648 |
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649 _tasks[i] = new CMTask(i, this, |
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650 _count_marked_bytes[i], |
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651 &_count_card_bitmaps[i], |
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652 task_queue, _task_queues); |
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653 |
| 342 | 654 _accum_task_vtime[i] = 0.0; |
| 655 } | |
| 656 | |
|
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657 // Calculate the card number for the bottom of the heap. Used |
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658 // in biasing indexes into the accounting card bitmaps. |
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659 _heap_bottom_card_num = |
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660 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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661 CardTableModRefBS::card_shift); |
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662 |
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663 // Clear all the liveness counting data |
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664 clear_all_count_data(); |
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665 |
| 1284 | 666 if (ConcGCThreads > ParallelGCThreads) { |
| 667 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
| 342 | 668 "than ParallelGCThreads."); |
| 669 } | |
| 670 if (ParallelGCThreads == 0) { | |
| 671 // if we are not running with any parallel GC threads we will not | |
| 672 // spawn any marking threads either | |
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673 _parallel_marking_threads = 0; |
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674 _max_parallel_marking_threads = 0; |
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675 _sleep_factor = 0.0; |
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676 _marking_task_overhead = 1.0; |
| 342 | 677 } else { |
| 1284 | 678 if (ConcGCThreads > 0) { |
| 679 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
| 342 | 680 // if both are set |
| 681 | |
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682 _parallel_marking_threads = (uint) ConcGCThreads; |
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683 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 684 _sleep_factor = 0.0; |
| 685 _marking_task_overhead = 1.0; | |
| 751 | 686 } else if (G1MarkingOverheadPercent > 0) { |
| 342 | 687 // we will calculate the number of parallel marking threads |
| 688 // based on a target overhead with respect to the soft real-time | |
| 689 // goal | |
| 690 | |
| 751 | 691 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 692 double overall_cm_overhead = |
| 751 | 693 (double) MaxGCPauseMillis * marking_overhead / |
| 694 (double) GCPauseIntervalMillis; | |
| 342 | 695 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 696 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 697 double marking_task_overhead = | |
| 698 overall_cm_overhead / marking_thread_num * | |
| 699 (double) os::processor_count(); | |
| 700 double sleep_factor = | |
| 701 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 702 | |
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703 _parallel_marking_threads = (uint) marking_thread_num; |
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704 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 705 _sleep_factor = sleep_factor; |
| 706 _marking_task_overhead = marking_task_overhead; | |
| 707 } else { | |
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708 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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709 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 710 _sleep_factor = 0.0; |
| 711 _marking_task_overhead = 1.0; | |
| 712 } | |
| 713 | |
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714 if (parallel_marking_threads() > 1) { |
| 342 | 715 _cleanup_task_overhead = 1.0; |
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716 } else { |
| 342 | 717 _cleanup_task_overhead = marking_task_overhead(); |
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718 } |
| 342 | 719 _cleanup_sleep_factor = |
| 720 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 721 | |
| 722 #if 0 | |
| 723 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 724 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 725 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 726 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 727 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 728 #endif | |
| 729 | |
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730 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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731 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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732 _max_parallel_marking_threads, false, true); |
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733 if (_parallel_workers == NULL) { |
| 342 | 734 vm_exit_during_initialization("Failed necessary allocation."); |
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735 } else { |
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736 _parallel_workers->initialize_workers(); |
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737 } |
| 342 | 738 } |
| 739 | |
| 740 // so that the call below can read a sensible value | |
| 741 _heap_start = (HeapWord*) rs.base(); | |
| 742 set_non_marking_state(); | |
| 743 } | |
| 744 | |
| 745 void ConcurrentMark::update_g1_committed(bool force) { | |
| 746 // If concurrent marking is not in progress, then we do not need to | |
| 747 // update _heap_end. This has a subtle and important | |
| 748 // side-effect. Imagine that two evacuation pauses happen between | |
| 749 // marking completion and remark. The first one can grow the | |
| 750 // heap (hence now the finger is below the heap end). Then, the | |
| 751 // second one could unnecessarily push regions on the region | |
| 752 // stack. This causes the invariant that the region stack is empty | |
| 753 // at the beginning of remark to be false. By ensuring that we do | |
| 754 // not observe heap expansions after marking is complete, then we do | |
| 755 // not have this problem. | |
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756 if (!concurrent_marking_in_progress() && !force) return; |
| 342 | 757 |
| 758 MemRegion committed = _g1h->g1_committed(); | |
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759 assert(committed.start() == _heap_start, "start shouldn't change"); |
| 342 | 760 HeapWord* new_end = committed.end(); |
| 761 if (new_end > _heap_end) { | |
| 762 // The heap has been expanded. | |
| 763 | |
| 764 _heap_end = new_end; | |
| 765 } | |
| 766 // Notice that the heap can also shrink. However, this only happens | |
| 767 // during a Full GC (at least currently) and the entire marking | |
| 768 // phase will bail out and the task will not be restarted. So, let's | |
| 769 // do nothing. | |
| 770 } | |
| 771 | |
| 772 void ConcurrentMark::reset() { | |
| 773 // Starting values for these two. This should be called in a STW | |
| 774 // phase. CM will be notified of any future g1_committed expansions | |
| 775 // will be at the end of evacuation pauses, when tasks are | |
| 776 // inactive. | |
| 777 MemRegion committed = _g1h->g1_committed(); | |
| 778 _heap_start = committed.start(); | |
| 779 _heap_end = committed.end(); | |
| 780 | |
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781 // Separated the asserts so that we know which one fires. |
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782 assert(_heap_start != NULL, "heap bounds should look ok"); |
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783 assert(_heap_end != NULL, "heap bounds should look ok"); |
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784 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 785 |
| 786 // reset all the marking data structures and any necessary flags | |
| 787 clear_marking_state(); | |
| 788 | |
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789 if (verbose_low()) { |
| 342 | 790 gclog_or_tty->print_cr("[global] resetting"); |
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791 } |
| 342 | 792 |
| 793 // We do reset all of them, since different phases will use | |
| 794 // different number of active threads. So, it's easiest to have all | |
| 795 // of them ready. | |
|
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796 for (int i = 0; i < (int) _max_task_num; ++i) { |
| 342 | 797 _tasks[i]->reset(_nextMarkBitMap); |
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798 } |
| 342 | 799 |
| 800 // we need this to make sure that the flag is on during the evac | |
| 801 // pause with initial mark piggy-backed | |
| 802 set_concurrent_marking_in_progress(); | |
| 803 } | |
| 804 | |
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805 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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806 assert(active_tasks <= _max_task_num, "we should not have more"); |
| 342 | 807 |
| 808 _active_tasks = active_tasks; | |
| 809 // Need to update the three data structures below according to the | |
| 810 // number of active threads for this phase. | |
| 811 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 812 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 813 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 814 | |
| 815 _concurrent = concurrent; | |
| 816 // We propagate this to all tasks, not just the active ones. | |
| 817 for (int i = 0; i < (int) _max_task_num; ++i) | |
| 818 _tasks[i]->set_concurrent(concurrent); | |
| 819 | |
| 820 if (concurrent) { | |
| 821 set_concurrent_marking_in_progress(); | |
| 822 } else { | |
| 823 // We currently assume that the concurrent flag has been set to | |
| 824 // false before we start remark. At this point we should also be | |
| 825 // in a STW phase. | |
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826 assert(!concurrent_marking_in_progress(), "invariant"); |
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827 assert(_finger == _heap_end, "only way to get here"); |
| 342 | 828 update_g1_committed(true); |
| 829 } | |
| 830 } | |
| 831 | |
| 832 void ConcurrentMark::set_non_marking_state() { | |
| 833 // We set the global marking state to some default values when we're | |
| 834 // not doing marking. | |
| 835 clear_marking_state(); | |
| 836 _active_tasks = 0; | |
| 837 clear_concurrent_marking_in_progress(); | |
| 838 } | |
| 839 | |
| 840 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 841 // The ConcurrentMark instance is never freed. |
| 842 ShouldNotReachHere(); | |
| 342 | 843 } |
| 844 | |
| 845 void ConcurrentMark::clearNextBitmap() { | |
|
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846 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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847 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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848 |
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849 // Make sure that the concurrent mark thread looks to still be in |
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850 // the current cycle. |
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851 guarantee(cmThread()->during_cycle(), "invariant"); |
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852 |
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853 // We are finishing up the current cycle by clearing the next |
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854 // marking bitmap and getting it ready for the next cycle. During |
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855 // this time no other cycle can start. So, let's make sure that this |
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856 // is the case. |
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857 guarantee(!g1h->mark_in_progress(), "invariant"); |
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858 |
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859 // clear the mark bitmap (no grey objects to start with). |
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860 // We need to do this in chunks and offer to yield in between |
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861 // each chunk. |
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862 HeapWord* start = _nextMarkBitMap->startWord(); |
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863 HeapWord* end = _nextMarkBitMap->endWord(); |
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864 HeapWord* cur = start; |
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865 size_t chunkSize = M; |
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866 while (cur < end) { |
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867 HeapWord* next = cur + chunkSize; |
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868 if (next > end) { |
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869 next = end; |
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870 } |
|
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871 MemRegion mr(cur,next); |
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872 _nextMarkBitMap->clearRange(mr); |
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873 cur = next; |
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874 do_yield_check(); |
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875 |
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876 // Repeat the asserts from above. We'll do them as asserts here to |
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877 // minimize their overhead on the product. However, we'll have |
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878 // them as guarantees at the beginning / end of the bitmap |
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879 // clearing to get some checking in the product. |
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880 assert(cmThread()->during_cycle(), "invariant"); |
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881 assert(!g1h->mark_in_progress(), "invariant"); |
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882 } |
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883 |
|
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884 // Clear the liveness counting data |
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885 clear_all_count_data(); |
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886 |
|
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887 // Repeat the asserts from above. |
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888 guarantee(cmThread()->during_cycle(), "invariant"); |
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889 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 890 } |
| 891 | |
| 892 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
| 893 public: | |
| 894 bool doHeapRegion(HeapRegion* r) { | |
| 895 if (!r->continuesHumongous()) { | |
|
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896 r->note_start_of_marking(); |
| 342 | 897 } |
| 898 return false; | |
| 899 } | |
| 900 }; | |
| 901 | |
| 902 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 903 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 904 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 905 | |
| 906 _has_aborted = false; | |
| 907 | |
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908 #ifndef PRODUCT |
| 1044 | 909 if (G1PrintReachableAtInitialMark) { |
| 1388 | 910 print_reachable("at-cycle-start", |
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911 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 912 } |
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913 #endif |
| 342 | 914 |
| 915 // Initialise marking structures. This has to be done in a STW phase. | |
| 916 reset(); | |
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917 |
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918 // For each region note start of marking. |
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919 NoteStartOfMarkHRClosure startcl; |
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920 g1h->heap_region_iterate(&startcl); |
| 342 | 921 } |
| 922 | |
| 923 | |
| 924 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 925 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 926 | |
|
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927 // If we force an overflow during remark, the remark operation will |
|
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928 // actually abort and we'll restart concurrent marking. If we always |
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929 // force an oveflow during remark we'll never actually complete the |
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930 // marking phase. So, we initilize this here, at the start of the |
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931 // cycle, so that at the remaining overflow number will decrease at |
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932 // every remark and we'll eventually not need to cause one. |
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933 force_overflow_stw()->init(); |
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934 |
|
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935 // Start Concurrent Marking weak-reference discovery. |
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936 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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937 // enable ("weak") refs discovery |
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938 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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939 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 940 |
| 941 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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942 // This is the start of the marking cycle, we're expected all |
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943 // threads to have SATB queues with active set to false. |
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944 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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945 false /* expected_active */); |
| 342 | 946 |
|
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947 _root_regions.prepare_for_scan(); |
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948 |
| 342 | 949 // update_g1_committed() will be called at the end of an evac pause |
| 950 // when marking is on. So, it's also called at the end of the | |
| 951 // initial-mark pause to update the heap end, if the heap expands | |
| 952 // during it. No need to call it here. | |
| 953 } | |
| 954 | |
| 955 /* | |
|
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956 * Notice that in the next two methods, we actually leave the STS |
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957 * during the barrier sync and join it immediately afterwards. If we |
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958 * do not do this, the following deadlock can occur: one thread could |
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959 * be in the barrier sync code, waiting for the other thread to also |
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960 * sync up, whereas another one could be trying to yield, while also |
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961 * waiting for the other threads to sync up too. |
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962 * |
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963 * Note, however, that this code is also used during remark and in |
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964 * this case we should not attempt to leave / enter the STS, otherwise |
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965 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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966 * (product). So we should only leave / enter the STS if we are |
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967 * operating concurrently. |
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968 * |
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969 * Because the thread that does the sync barrier has left the STS, it |
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970 * is possible to be suspended for a Full GC or an evacuation pause |
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971 * could occur. This is actually safe, since the entering the sync |
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972 * barrier is one of the last things do_marking_step() does, and it |
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973 * doesn't manipulate any data structures afterwards. |
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974 */ |
| 342 | 975 |
| 976 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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977 if (verbose_low()) { |
| 342 | 978 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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979 } |
| 342 | 980 |
|
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981 if (concurrent()) { |
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982 ConcurrentGCThread::stsLeave(); |
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983 } |
| 342 | 984 _first_overflow_barrier_sync.enter(); |
|
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985 if (concurrent()) { |
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986 ConcurrentGCThread::stsJoin(); |
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987 } |
| 342 | 988 // at this point everyone should have synced up and not be doing any |
| 989 // more work | |
| 990 | |
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991 if (verbose_low()) { |
| 342 | 992 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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993 } |
| 342 | 994 |
| 995 // let task 0 do this | |
| 996 if (task_num == 0) { | |
| 997 // task 0 is responsible for clearing the global data structures | |
|
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998 // We should be here because of an overflow. During STW we should |
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999 // not clear the overflow flag since we rely on it being true when |
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1000 // we exit this method to abort the pause and restart concurent |
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1001 // marking. |
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1002 clear_marking_state(concurrent() /* clear_overflow */); |
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1003 force_overflow()->update(); |
| 342 | 1004 |
| 1005 if (PrintGC) { | |
| 1006 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
| 1007 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 1008 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
| 1009 } | |
| 1010 } | |
| 1011 | |
| 1012 // after this, each task should reset its own data structures then | |
| 1013 // then go into the second barrier | |
| 1014 } | |
| 1015 | |
| 1016 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
|
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1017 if (verbose_low()) { |
| 342 | 1018 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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1019 } |
| 342 | 1020 |
|
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1021 if (concurrent()) { |
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1022 ConcurrentGCThread::stsLeave(); |
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1023 } |
| 342 | 1024 _second_overflow_barrier_sync.enter(); |
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1025 if (concurrent()) { |
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1026 ConcurrentGCThread::stsJoin(); |
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1027 } |
| 342 | 1028 // at this point everything should be re-initialised and ready to go |
| 1029 | |
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1030 if (verbose_low()) { |
| 342 | 1031 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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1032 } |
| 342 | 1033 } |
| 1034 | |
|
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1035 #ifndef PRODUCT |
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1036 void ForceOverflowSettings::init() { |
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1037 _num_remaining = G1ConcMarkForceOverflow; |
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1038 _force = false; |
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1039 update(); |
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1040 } |
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1041 |
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1042 void ForceOverflowSettings::update() { |
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1043 if (_num_remaining > 0) { |
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1044 _num_remaining -= 1; |
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1045 _force = true; |
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1046 } else { |
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1047 _force = false; |
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1048 } |
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1049 } |
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1050 |
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1051 bool ForceOverflowSettings::should_force() { |
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1052 if (_force) { |
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1053 _force = false; |
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1054 return true; |
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1055 } else { |
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1056 return false; |
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1057 } |
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1058 } |
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1059 #endif // !PRODUCT |
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1060 |
| 342 | 1061 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { |
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1062 guarantee(false, "grayRegionIfNecessary(): don't call this any more"); |
|
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1063 |
| 342 | 1064 // The objects on the region have already been marked "in bulk" by |
| 1065 // the caller. We only need to decide whether to push the region on | |
| 1066 // the region stack or not. | |
| 1067 | |
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1068 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
| 342 | 1069 // We're done with marking and waiting for remark. We do not need to |
| 1070 // push anything else on the region stack. | |
| 1071 return; | |
|
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1072 } |
| 342 | 1073 |
| 1074 HeapWord* finger = _finger; | |
| 1075 | |
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1076 if (verbose_low()) { |
| 342 | 1077 gclog_or_tty->print_cr("[global] attempting to push " |
| 1078 "region ["PTR_FORMAT", "PTR_FORMAT"), finger is at " | |
| 1079 PTR_FORMAT, mr.start(), mr.end(), finger); | |
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1080 } |
| 342 | 1081 |
| 1082 if (mr.start() < finger) { | |
| 1083 // The finger is always heap region aligned and it is not possible | |
| 1084 // for mr to span heap regions. | |
|
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1085 assert(mr.end() <= finger, "invariant"); |
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1086 |
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1087 // Separated the asserts so that we know which one fires. |
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1088 assert(mr.start() <= mr.end(), |
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1089 "region boundaries should fall within the committed space"); |
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1090 assert(_heap_start <= mr.start(), |
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1091 "region boundaries should fall within the committed space"); |
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1092 assert(mr.end() <= _heap_end, |
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1093 "region boundaries should fall within the committed space"); |
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1094 if (verbose_low()) { |
| 342 | 1095 gclog_or_tty->print_cr("[global] region ["PTR_FORMAT", "PTR_FORMAT") " |
| 1096 "below the finger, pushing it", | |
| 1097 mr.start(), mr.end()); | |
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1098 } |
| 342 | 1099 |
|
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1100 if (!region_stack_push_lock_free(mr)) { |
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1101 if (verbose_low()) { |
| 342 | 1102 gclog_or_tty->print_cr("[global] region stack has overflown."); |
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1103 } |
| 342 | 1104 } |
| 1105 } | |
| 1106 } | |
| 1107 | |
| 1108 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
|
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1109 guarantee(false, "markAndGrayObjectIfNecessary(): don't call this any more"); |
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1110 |
| 342 | 1111 // The object is not marked by the caller. We need to at least mark |
| 1112 // it and maybe push in on the stack. | |
| 1113 | |
| 1114 HeapWord* addr = (HeapWord*)p; | |
| 1115 if (!_nextMarkBitMap->isMarked(addr)) { | |
| 1116 // We definitely need to mark it, irrespective whether we bail out | |
| 1117 // because we're done with marking. | |
| 1118 if (_nextMarkBitMap->parMark(addr)) { | |
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1119 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
| 342 | 1120 // If we're done with concurrent marking and we're waiting for |
| 1121 // remark, then we're not pushing anything on the stack. | |
| 1122 return; | |
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1123 } |
| 342 | 1124 |
| 1125 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 1126 // CAS done in parMark(addr) above | |
| 1127 HeapWord* finger = _finger; | |
| 1128 | |
| 1129 if (addr < finger) { | |
| 1130 if (!mark_stack_push(oop(addr))) { | |
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1131 if (verbose_low()) { |
| 342 | 1132 gclog_or_tty->print_cr("[global] global stack overflow " |
| 1133 "during parMark"); | |
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1134 } |
| 342 | 1135 } |
| 1136 } | |
| 1137 } | |
| 1138 } | |
| 1139 } | |
| 1140 | |
| 1141 class CMConcurrentMarkingTask: public AbstractGangTask { | |
| 1142 private: | |
| 1143 ConcurrentMark* _cm; | |
| 1144 ConcurrentMarkThread* _cmt; | |
| 1145 | |
| 1146 public: | |
|
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1147 void work(uint worker_id) { |
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1148 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1149 "this should only be done by a conc GC thread"); |
|
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1150 ResourceMark rm; |
| 342 | 1151 |
| 1152 double start_vtime = os::elapsedVTime(); | |
| 1153 | |
| 1154 ConcurrentGCThread::stsJoin(); | |
| 1155 | |
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1156 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1157 CMTask* the_task = _cm->task(worker_id); |
| 342 | 1158 the_task->record_start_time(); |
| 1159 if (!_cm->has_aborted()) { | |
| 1160 do { | |
| 1161 double start_vtime_sec = os::elapsedVTime(); | |
| 1162 double start_time_sec = os::elapsedTime(); | |
|
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1163 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1164 |
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1165 the_task->do_marking_step(mark_step_duration_ms, |
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1166 true /* do_stealing */, |
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1167 true /* do_termination */); |
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1168 |
| 342 | 1169 double end_time_sec = os::elapsedTime(); |
| 1170 double end_vtime_sec = os::elapsedVTime(); | |
| 1171 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 1172 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 1173 _cm->clear_has_overflown(); | |
| 1174 | |
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1175 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 1176 |
| 1177 jlong sleep_time_ms; | |
| 1178 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 1179 sleep_time_ms = | |
| 1180 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 1181 ConcurrentGCThread::stsLeave(); | |
| 1182 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 1183 ConcurrentGCThread::stsJoin(); | |
| 1184 } | |
| 1185 double end_time2_sec = os::elapsedTime(); | |
| 1186 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 1187 | |
| 1188 #if 0 | |
| 1189 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 1190 "overhead %1.4lf", | |
| 1191 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 1192 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 1193 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 1194 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 1195 #endif | |
| 1196 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 1197 } | |
| 1198 the_task->record_end_time(); | |
|
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1199 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 1200 |
| 1201 ConcurrentGCThread::stsLeave(); | |
| 1202 | |
| 1203 double end_vtime = os::elapsedVTime(); | |
|
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1204 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 1205 } |
| 1206 | |
| 1207 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 1208 ConcurrentMarkThread* cmt) : | |
| 1209 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 1210 | |
| 1211 ~CMConcurrentMarkingTask() { } | |
| 1212 }; | |
| 1213 | |
|
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1214 // Calculates the number of active workers for a concurrent |
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1215 // phase. |
|
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1216 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 1217 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1218 uint n_conc_workers = 0; |
|
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1219 if (!UseDynamicNumberOfGCThreads || |
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1220 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1221 !ForceDynamicNumberOfGCThreads)) { |
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1222 n_conc_workers = max_parallel_marking_threads(); |
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1223 } else { |
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1224 n_conc_workers = |
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1225 AdaptiveSizePolicy::calc_default_active_workers( |
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1226 max_parallel_marking_threads(), |
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1227 1, /* Minimum workers */ |
|
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1228 parallel_marking_threads(), |
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1229 Threads::number_of_non_daemon_threads()); |
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1230 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1231 // that scaling has already gone into "_max_parallel_marking_threads". |
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1232 } |
| 4711 | 1233 assert(n_conc_workers > 0, "Always need at least 1"); |
| 1234 return n_conc_workers; | |
|
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1235 } |
| 4711 | 1236 // If we are not running with any parallel GC threads we will not |
| 1237 // have spawned any marking threads either. Hence the number of | |
| 1238 // concurrent workers should be 0. | |
| 1239 return 0; | |
|
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1240 } |
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1241 |
|
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1242 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1243 // Currently, only survivors can be root regions. |
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1244 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1245 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1246 |
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1247 const uintx interval = PrefetchScanIntervalInBytes; |
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1248 HeapWord* curr = hr->bottom(); |
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1249 const HeapWord* end = hr->top(); |
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1250 while (curr < end) { |
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1251 Prefetch::read(curr, interval); |
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1252 oop obj = oop(curr); |
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1253 int size = obj->oop_iterate(&cl); |
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1254 assert(size == obj->size(), "sanity"); |
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1255 curr += size; |
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1256 } |
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1257 } |
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1258 |
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1259 class CMRootRegionScanTask : public AbstractGangTask { |
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1260 private: |
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1261 ConcurrentMark* _cm; |
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1262 |
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1263 public: |
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1264 CMRootRegionScanTask(ConcurrentMark* cm) : |
|
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1265 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1266 |
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1267 void work(uint worker_id) { |
|
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1268 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1269 "this should only be done by a conc GC thread"); |
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1270 |
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1271 CMRootRegions* root_regions = _cm->root_regions(); |
|
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1272 HeapRegion* hr = root_regions->claim_next(); |
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1273 while (hr != NULL) { |
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1274 _cm->scanRootRegion(hr, worker_id); |
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1275 hr = root_regions->claim_next(); |
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1276 } |
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1277 } |
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1278 }; |
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1279 |
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1280 void ConcurrentMark::scanRootRegions() { |
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1281 // scan_in_progress() will have been set to true only if there was |
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1282 // at least one root region to scan. So, if it's false, we |
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1283 // should not attempt to do any further work. |
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1284 if (root_regions()->scan_in_progress()) { |
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1285 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1286 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1287 "Maximum number of marking threads exceeded"); |
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1288 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1289 |
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1290 CMRootRegionScanTask task(this); |
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1291 if (parallel_marking_threads() > 0) { |
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1292 _parallel_workers->set_active_workers((int) active_workers); |
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1293 _parallel_workers->run_task(&task); |
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1294 } else { |
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1295 task.work(0); |
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1296 } |
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1297 |
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1298 // It's possible that has_aborted() is true here without actually |
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1299 // aborting the survivor scan earlier. This is OK as it's |
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1300 // mainly used for sanity checking. |
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1301 root_regions()->scan_finished(); |
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1302 } |
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1303 } |
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1304 |
| 342 | 1305 void ConcurrentMark::markFromRoots() { |
| 1306 // we might be tempted to assert that: | |
| 1307 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1308 // "inconsistent argument?"); | |
| 1309 // However that wouldn't be right, because it's possible that | |
| 1310 // a safepoint is indeed in progress as a younger generation | |
| 1311 // stop-the-world GC happens even as we mark in this generation. | |
| 1312 | |
| 1313 _restart_for_overflow = false; | |
|
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1314 force_overflow_conc()->init(); |
|
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1315 |
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1316 // _g1h has _n_par_threads |
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1317 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1318 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1319 "Maximum number of marking threads exceeded"); |
| 4711 | 1320 |
|
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1321 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1322 |
| 1323 // Parallel task terminator is set in "set_phase()" | |
| 1324 set_phase(active_workers, true /* concurrent */); | |
| 342 | 1325 |
| 1326 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1327 if (parallel_marking_threads() > 0) { |
| 4711 | 1328 _parallel_workers->set_active_workers((int)active_workers); |
| 1329 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
| 1330 // and the decisions on that MT processing is made elsewhere. | |
| 1331 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1332 _parallel_workers->run_task(&markingTask); |
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1333 } else { |
| 342 | 1334 markingTask.work(0); |
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1335 } |
| 342 | 1336 print_stats(); |
| 1337 } | |
| 1338 | |
| 1339 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1340 // world is stopped at this checkpoint | |
| 1341 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1342 "world should be stopped"); | |
|
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1343 |
| 342 | 1344 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1345 | |
| 1346 // If a full collection has happened, we shouldn't do this. | |
| 1347 if (has_aborted()) { | |
| 1348 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1349 return; | |
| 1350 } | |
| 1351 | |
|
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1352 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1353 |
|
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1354 if (VerifyDuringGC) { |
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1355 HandleMark hm; // handle scope |
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1356 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1357 Universe::heap()->prepare_for_verify(); |
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1358 Universe::verify(/* allow dirty */ true, |
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1359 /* silent */ false, |
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1360 /* option */ VerifyOption_G1UsePrevMarking); |
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1361 } |
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1362 |
| 342 | 1363 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1364 g1p->record_concurrent_mark_remark_start(); | |
| 1365 | |
| 1366 double start = os::elapsedTime(); | |
| 1367 | |
| 1368 checkpointRootsFinalWork(); | |
| 1369 | |
| 1370 double mark_work_end = os::elapsedTime(); | |
| 1371 | |
| 1372 weakRefsWork(clear_all_soft_refs); | |
| 1373 | |
| 1374 if (has_overflown()) { | |
| 1375 // Oops. We overflowed. Restart concurrent marking. | |
| 1376 _restart_for_overflow = true; | |
| 1377 // Clear the flag. We do not need it any more. | |
| 1378 clear_has_overflown(); | |
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1379 if (G1TraceMarkStackOverflow) { |
| 342 | 1380 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1381 } |
| 342 | 1382 } else { |
|
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1383 // Aggregate the per-task counting data that we have accumulated |
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1384 // while marking. |
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1385 aggregate_count_data(); |
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1386 |
| 2149 | 1387 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1388 // We're done with marking. |
|
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1389 // This is the end of the marking cycle, we're expected all |
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1390 // threads to have SATB queues with active set to true. |
| 2149 | 1391 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1392 true /* expected_active */); | |
| 811 | 1393 |
| 1394 if (VerifyDuringGC) { | |
|
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1395 HandleMark hm; // handle scope |
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1396 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1397 Universe::heap()->prepare_for_verify(); |
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1398 Universe::verify(/* allow dirty */ true, |
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1399 /* silent */ false, |
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1400 /* option */ VerifyOption_G1UseNextMarking); |
| 811 | 1401 } |
|
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1402 assert(!restart_for_overflow(), "sanity"); |
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1403 } |
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1404 |
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1405 // Reset the marking state if marking completed |
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1406 if (!restart_for_overflow()) { |
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1407 set_non_marking_state(); |
| 342 | 1408 } |
| 1409 | |
| 1410 #if VERIFY_OBJS_PROCESSED | |
| 1411 _scan_obj_cl.objs_processed = 0; | |
| 1412 ThreadLocalObjQueue::objs_enqueued = 0; | |
| 1413 #endif | |
| 1414 | |
| 1415 // Statistics | |
| 1416 double now = os::elapsedTime(); | |
| 1417 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1418 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1419 _remark_times.add((now - start) * 1000.0); | |
| 1420 | |
| 1421 g1p->record_concurrent_mark_remark_end(); | |
| 1422 } | |
| 1423 | |
|
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1424 // Used to calculate the # live objects per region |
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1425 // for verification purposes |
| 342 | 1426 class CalcLiveObjectsClosure: public HeapRegionClosure { |
| 1427 | |
| 1428 CMBitMapRO* _bm; | |
| 1429 ConcurrentMark* _cm; | |
| 1430 BitMap* _region_bm; | |
| 1431 BitMap* _card_bm; | |
|
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1432 |
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1433 // Debugging |
|
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1434 size_t _tot_words_done; |
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1435 size_t _tot_live; |
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1436 size_t _tot_used; |
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1437 |
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1438 size_t _region_marked_bytes; |
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1439 |
| 342 | 1440 intptr_t _bottom_card_num; |
| 1441 | |
| 1442 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
|
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1443 assert(start_card_num <= last_card_num, "sanity"); |
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1444 BitMap::idx_t start_idx = start_card_num - _bottom_card_num; |
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1445 BitMap::idx_t last_idx = last_card_num - _bottom_card_num; |
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1446 |
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1447 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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1448 _card_bm->par_at_put(i, 1); |
| 342 | 1449 } |
| 1450 } | |
| 1451 | |
| 1452 public: | |
|
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1453 CalcLiveObjectsClosure(CMBitMapRO *bm, ConcurrentMark *cm, |
| 936 | 1454 BitMap* region_bm, BitMap* card_bm) : |
|
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1455 _bm(bm), _cm(cm), _region_bm(region_bm), _card_bm(card_bm), |
|
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1456 _region_marked_bytes(0), _tot_words_done(0), |
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1457 _tot_live(0), _tot_used(0), |
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1458 _bottom_card_num(cm->heap_bottom_card_num()) { } |
| 342 | 1459 |
| 829 | 1460 // It takes a region that's not empty (i.e., it has at least one |
| 1461 // live object in it and sets its corresponding bit on the region | |
| 1462 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1463 // to 1 the bits on the region bitmap that correspond to its | |
| 1464 // associated "continues humongous" regions. | |
| 1465 void set_bit_for_region(HeapRegion* hr) { | |
| 1466 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1467 | |
| 1468 size_t index = hr->hrs_index(); | |
| 1469 if (!hr->startsHumongous()) { | |
| 1470 // Normal (non-humongous) case: just set the bit. | |
| 1471 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
| 1472 } else { | |
| 1473 // Starts humongous case: calculate how many regions are part of | |
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1474 // this humongous region and then set the bit range. |
| 829 | 1475 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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1476 HeapRegion *last_hr = g1h->heap_region_containing_raw(hr->end() - 1); |
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1477 size_t end_index = last_hr->hrs_index() + 1; |
| 829 | 1478 _region_bm->par_at_put_range((BitMap::idx_t) index, |
| 1479 (BitMap::idx_t) end_index, true); | |
| 1480 } | |
| 1481 } | |
| 1482 | |
| 342 | 1483 bool doHeapRegion(HeapRegion* hr) { |
| 1484 | |
| 639 | 1485 if (hr->continuesHumongous()) { |
| 829 | 1486 // We will ignore these here and process them when their |
| 1487 // associated "starts humongous" region is processed (see | |
| 1488 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1489 // associated "starts humongous" region to have their bit set to | |
| 1490 // 1 since, due to the region chunking in the parallel region | |
| 1491 // iteration, a "continues humongous" region might be visited | |
| 1492 // before its associated "starts humongous". | |
| 639 | 1493 return false; |
| 1494 } | |
| 342 | 1495 |
| 1496 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
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1497 HeapWord* start = hr->bottom(); |
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1498 |
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1499 assert(start <= hr->end() && start <= nextTop && nextTop <= hr->end(), |
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1500 err_msg("Preconditions not met - " |
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1501 "start: "PTR_FORMAT", nextTop: "PTR_FORMAT", end: "PTR_FORMAT, |
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1502 start, nextTop, hr->end())); |
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1503 |
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1504 // Record the number of word's we'll examine. |
| 342 | 1505 size_t words_done = (nextTop - start); |
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1506 |
| 342 | 1507 // Find the first marked object at or after "start". |
| 1508 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
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1509 |
| 342 | 1510 size_t marked_bytes = 0; |
| 1511 | |
| 1512 // Below, the term "card num" means the result of shifting an address | |
| 1513 // by the card shift -- address 0 corresponds to card number 0. One | |
| 1514 // must subtract the card num of the bottom of the heap to obtain a | |
| 1515 // card table index. | |
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1516 |
| 342 | 1517 // The first card num of the sequence of live cards currently being |
| 1518 // constructed. -1 ==> no sequence. | |
| 1519 intptr_t start_card_num = -1; | |
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1520 |
| 342 | 1521 // The last card num of the sequence of live cards currently being |
| 1522 // constructed. -1 ==> no sequence. | |
| 1523 intptr_t last_card_num = -1; | |
| 1524 | |
| 1525 while (start < nextTop) { | |
| 1526 oop obj = oop(start); | |
| 1527 int obj_sz = obj->size(); | |
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1528 |
| 342 | 1529 // The card num of the start of the current object. |
| 1530 intptr_t obj_card_num = | |
| 1531 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
| 1532 HeapWord* obj_last = start + obj_sz - 1; | |
| 1533 intptr_t obj_last_card_num = | |
| 1534 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
| 1535 | |
| 1536 if (obj_card_num != last_card_num) { | |
| 1537 if (start_card_num == -1) { | |
| 1538 assert(last_card_num == -1, "Both or neither."); | |
| 1539 start_card_num = obj_card_num; | |
| 1540 } else { | |
| 1541 assert(last_card_num != -1, "Both or neither."); | |
| 1542 assert(obj_card_num >= last_card_num, "Inv"); | |
| 1543 if ((obj_card_num - last_card_num) > 1) { | |
| 1544 // Mark the last run, and start a new one. | |
| 1545 mark_card_num_range(start_card_num, last_card_num); | |
| 1546 start_card_num = obj_card_num; | |
| 1547 } | |
| 1548 } | |
| 1549 } | |
| 1550 // In any case, we set the last card num. | |
| 1551 last_card_num = obj_last_card_num; | |
| 1552 | |
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1553 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1554 |
| 342 | 1555 // Find the next marked object after this one. |
| 1556 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
| 1557 } | |
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1558 |
| 342 | 1559 // Handle the last range, if any. |
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1560 if (start_card_num != -1) { |
| 342 | 1561 mark_card_num_range(start_card_num, last_card_num); |
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1562 } |
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1563 |
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1564 // Mark the allocated-since-marking portion... |
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1565 HeapWord* top = hr->top(); |
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1566 if (nextTop < top) { |
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1567 start_card_num = intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); |
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1568 last_card_num = intptr_t(uintptr_t(top) >> CardTableModRefBS::card_shift); |
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1569 |
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1570 mark_card_num_range(start_card_num, last_card_num); |
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1571 |
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1572 // This definitely means the region has live objects. |
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1573 set_bit_for_region(hr); |
| 342 | 1574 } |
| 1575 | |
| 1576 // Update the live region bitmap. | |
| 1577 if (marked_bytes > 0) { | |
| 829 | 1578 set_bit_for_region(hr); |
| 342 | 1579 } |
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1580 |
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1581 // Set the marked bytes for the current region so that |
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1582 // it can be queried by a calling verificiation routine |
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1583 _region_marked_bytes = marked_bytes; |
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1584 |
| 342 | 1585 _tot_live += hr->next_live_bytes(); |
| 1586 _tot_used += hr->used(); | |
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1587 _tot_words_done = words_done; |
| 342 | 1588 |
| 1589 return false; | |
| 1590 } | |
| 1591 | |
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1592 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1593 |
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1594 // Debugging |
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1595 size_t tot_words_done() const { return _tot_words_done; } |
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1596 size_t tot_live() const { return _tot_live; } |
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1597 size_t tot_used() const { return _tot_used; } |
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1598 }; |
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1599 |
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1600 // Heap region closure used for verifying the counting data |
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1601 // that was accumulated concurrently and aggregated during |
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1602 // the remark pause. This closure is applied to the heap |
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1603 // regions during the STW cleanup pause. |
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1604 |
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1605 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1606 ConcurrentMark* _cm; |
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1607 CalcLiveObjectsClosure _calc_cl; |
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1608 BitMap* _region_bm; // Region BM to be verified |
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1609 BitMap* _card_bm; // Card BM to be verified |
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1610 bool _verbose; // verbose output? |
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1611 |
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1612 BitMap* _exp_region_bm; // Expected Region BM values |
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1613 BitMap* _exp_card_bm; // Expected card BM values |
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1614 |
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1615 int _failures; |
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1616 |
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1617 public: |
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1618 VerifyLiveObjectDataHRClosure(ConcurrentMark* cm, |
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1619 BitMap* region_bm, |
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1620 BitMap* card_bm, |
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1621 BitMap* exp_region_bm, |
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1622 BitMap* exp_card_bm, |
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1623 bool verbose) : |
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1624 _cm(cm), |
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1625 _calc_cl(_cm->nextMarkBitMap(), _cm, exp_region_bm, exp_card_bm), |
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1626 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1627 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1628 _failures(0) { } |
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1629 |
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1630 int failures() const { return _failures; } |
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1631 |
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1632 bool doHeapRegion(HeapRegion* hr) { |
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1633 if (hr->continuesHumongous()) { |
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1634 // We will ignore these here and process them when their |
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1635 // associated "starts humongous" region is processed (see |
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1636 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1637 // associated "starts humongous" region to have their bit set to |
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1638 // 1 since, due to the region chunking in the parallel region |
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1639 // iteration, a "continues humongous" region might be visited |
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1640 // before its associated "starts humongous". |
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1641 return false; |
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1642 } |
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1643 |
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1644 int failures = 0; |
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1645 |
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1646 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1647 // this region and set the corresponding bits in the expected region |
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1648 // and card bitmaps. |
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1649 bool res = _calc_cl.doHeapRegion(hr); |
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|
1650 assert(res == false, "should be continuing"); |
|
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4830
diff
changeset
|
1651 |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1652 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
1653 Mutex::_no_safepoint_check_flag); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1654 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1655 // Verify that _top_at_conc_count == ntams |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
1656 if (hr->top_at_conc_mark_count() != hr->next_top_at_mark_start()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1657 if (_verbose) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1658 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": top at conc count incorrect: " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1659 "expected " PTR_FORMAT ", actual: " PTR_FORMAT, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
1660 hr->hrs_index(), hr->next_top_at_mark_start(), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1661 hr->top_at_conc_mark_count()); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1662 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1663 failures += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1664 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1665 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1666 // Verify the marked bytes for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
1667 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
1668 size_t act_marked_bytes = hr->next_marked_bytes(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
1669 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
1670 // We're not OK if expected marked bytes > actual marked bytes. It means |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1671 // we have missed accounting some objects during the actual marking. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1672 if (exp_marked_bytes > act_marked_bytes) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1673 if (_verbose) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1674 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": marked bytes mismatch: " |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
1675 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1676 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
1677 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1678 failures += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1679 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1680 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1681 // Verify the bit, for this region, in the actual and expected |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1682 // (which was just calculated) region bit maps. |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1683 // We're not OK if the bit in the calculated expected region |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
1684 // bitmap is set and the bit in the actual region bitmap is not. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
1685 BitMap::idx_t index = (BitMap::idx_t)hr->hrs_index(); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1686 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
1687 bool expected = _exp_region_bm->at(index); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1688 bool actual = _region_bm->at(index); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1689 if (expected && !actual) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1690 if (_verbose) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1691 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": region bitmap mismatch: " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1692 "expected: %d, actual: %d", |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1693 hr->hrs_index(), expected, actual); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1694 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1695 failures += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1696 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1697 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1698 // Verify that the card bit maps for the cards spanned by the current |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1699 // region match. We have an error if we have a set bit in the expected |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1700 // bit map and the corresponding bit in the actual bitmap is not set. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1701 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1702 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1703 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1704 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1705 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1706 expected = _exp_card_bm->at(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1707 actual = _card_bm->at(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1708 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1709 if (expected && !actual) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1710 if (_verbose) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1711 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": card bitmap mismatch at " SIZE_FORMAT ": " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1712 "expected: %d, actual: %d", |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1713 hr->hrs_index(), i, expected, actual); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1714 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1715 failures += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1716 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1717 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1718 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1719 if (failures > 0 && _verbose) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1720 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1721 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1722 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1723 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1724 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1725 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1726 _failures += failures; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1727 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1728 // We could stop iteration over the heap when we |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1729 // find the first voilating region by returning true. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1730 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1731 } |
| 342 | 1732 }; |
| 1733 | |
| 1734 | |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1735 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1736 protected: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1737 G1CollectedHeap* _g1h; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1738 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1739 BitMap* _actual_region_bm; |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
1740 BitMap* _actual_card_bm; |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
1741 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1742 uint _n_workers; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1743 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1744 BitMap* _expected_region_bm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1745 BitMap* _expected_card_bm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1746 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1747 int _failures; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1748 bool _verbose; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1749 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1750 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1751 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1752 BitMap* region_bm, BitMap* card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1753 BitMap* expected_region_bm, BitMap* expected_card_bm) |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1754 : AbstractGangTask("G1 verify final counting"), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1755 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1756 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1757 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1758 _failures(0), _verbose(false), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1759 _n_workers(0) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1760 assert(VerifyDuringGC, "don't call this otherwise"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1761 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1762 // Use the value already set as the number of active threads |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1763 // in the call to run_task(). |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1764 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1765 assert( _g1h->workers()->active_workers() > 0, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1766 "Should have been previously set"); |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
1767 _n_workers = _g1h->workers()->active_workers(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1768 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1769 _n_workers = 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1770 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1771 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
1772 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
|
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1773 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
|
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|
1774 |
|
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1775 _verbose = _cm->verbose_medium(); |
|
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1776 } |
|
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|
1777 |
|
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|
1778 void work(uint worker_id) { |
|
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1779 assert(worker_id < _n_workers, "invariant"); |
|
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|
1780 |
|
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1781 VerifyLiveObjectDataHRClosure verify_cl(_cm, |
|
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1782 _actual_region_bm, _actual_card_bm, |
|
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1783 _expected_region_bm, |
|
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1784 _expected_card_bm, |
|
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|
1785 _verbose); |
|
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|
1786 |
|
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1787 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1788 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
|
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1789 worker_id, |
|
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|
1790 _n_workers, |
|
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|
1791 HeapRegion::VerifyCountClaimValue); |
|
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1792 } else { |
|
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|
1793 _g1h->heap_region_iterate(&verify_cl); |
|
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1794 } |
|
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|
1795 |
|
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1796 Atomic::add(verify_cl.failures(), &_failures); |
|
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1797 } |
|
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|
1798 |
|
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1799 int failures() const { return _failures; } |
|
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1800 }; |
|
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|
1801 |
|
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1802 // Final update of count data (during cleanup). |
|
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1803 // Adds [top_at_count, NTAMS) to the marked bytes for each |
|
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1804 // region. Sets the bits in the card bitmap corresponding |
|
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1805 // to the interval [top_at_count, top], and sets the |
|
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1806 // liveness bit for each region containing live data |
|
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1807 // in the region bitmap. |
|
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|
1808 |
|
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|
1809 class FinalCountDataUpdateClosure: public HeapRegionClosure { |
|
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1810 ConcurrentMark* _cm; |
|
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1811 BitMap* _region_bm; |
|
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1812 BitMap* _card_bm; |
|
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|
1813 |
|
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1814 size_t _total_live_bytes; |
|
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1815 size_t _total_used_bytes; |
|
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1816 size_t _total_words_done; |
|
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|
1817 |
|
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1818 void set_card_bitmap_range(BitMap::idx_t start_idx, BitMap::idx_t last_idx) { |
|
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1819 assert(start_idx <= last_idx, "sanity"); |
|
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|
1820 |
|
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1821 // Set the inclusive bit range [start_idx, last_idx]. |
|
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1822 // For small ranges (up to 8 cards) use a simple loop; otherwise |
|
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1823 // use par_at_put_range. |
|
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1824 if ((last_idx - start_idx) <= 8) { |
|
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1825 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
|
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1826 _card_bm->par_set_bit(i); |
|
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1827 } |
|
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1828 } else { |
|
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1829 assert(last_idx < _card_bm->size(), "sanity"); |
|
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1830 // Note BitMap::par_at_put_range() is exclusive. |
|
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1831 _card_bm->par_at_put_range(start_idx, last_idx+1, true); |
|
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1832 } |
|
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|
1833 } |
|
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|
1834 |
|
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1835 // It takes a region that's not empty (i.e., it has at least one |
|
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1836 // live object in it and sets its corresponding bit on the region |
|
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1837 // bitmap to 1. If the region is "starts humongous" it will also set |
|
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1838 // to 1 the bits on the region bitmap that correspond to its |
|
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1839 // associated "continues humongous" regions. |
|
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1840 void set_bit_for_region(HeapRegion* hr) { |
|
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1841 assert(!hr->continuesHumongous(), "should have filtered those out"); |
|
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|
1842 |
|
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|
1843 size_t index = hr->hrs_index(); |
|
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1844 if (!hr->startsHumongous()) { |
|
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1845 // Normal (non-humongous) case: just set the bit. |
|
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1846 _region_bm->par_set_bit((BitMap::idx_t) index); |
|
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|
1847 } else { |
|
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|
1848 // Starts humongous case: calculate how many regions are part of |
|
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|
1849 // this humongous region and then set the bit range. |
|
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1850 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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|
1851 HeapRegion *last_hr = g1h->heap_region_containing_raw(hr->end() - 1); |
|
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1852 size_t end_index = last_hr->hrs_index() + 1; |
|
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|
1853 _region_bm->par_at_put_range((BitMap::idx_t) index, |
|
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|
1854 (BitMap::idx_t) end_index, true); |
|
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|
1855 } |
|
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|
1856 } |
|
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changeset
|
1857 |
|
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|
1858 public: |
|
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|
1859 FinalCountDataUpdateClosure(ConcurrentMark* cm, |
|
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|
1860 BitMap* region_bm, |
|
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|
1861 BitMap* card_bm) : |
|
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|
1862 _cm(cm), _region_bm(region_bm), _card_bm(card_bm), |
|
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|
1863 _total_words_done(0), _total_live_bytes(0), _total_used_bytes(0) { } |
|
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|
1864 |
|
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|
1865 bool doHeapRegion(HeapRegion* hr) { |
|
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|
1866 |
|
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|
1867 if (hr->continuesHumongous()) { |
|
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|
1868 // We will ignore these here and process them when their |
|
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|
1869 // associated "starts humongous" region is processed (see |
|
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|
1870 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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|
1871 // associated "starts humongous" region to have their bit set to |
|
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|
1872 // 1 since, due to the region chunking in the parallel region |
|
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|
1873 // iteration, a "continues humongous" region might be visited |
|
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|
1874 // before its associated "starts humongous". |
|
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|
1875 return false; |
|
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|
1876 } |
|
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changeset
|
1877 |
|
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|
1878 HeapWord* start = hr->top_at_conc_mark_count(); |
|
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|
1879 HeapWord* ntams = hr->next_top_at_mark_start(); |
|
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|
1880 HeapWord* top = hr->top(); |
|
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|
1881 |
|
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diff
changeset
|
1882 assert(hr->bottom() <= start && start <= hr->end() && |
|
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|
1883 hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
|
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|
1884 |
|
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|
1885 size_t words_done = ntams - hr->bottom(); |
|
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|
1886 |
|
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changeset
|
1887 if (start < ntams) { |
|
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|
1888 // Region was changed between remark and cleanup pauses |
|
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|
1889 // We need to add (ntams - start) to the marked bytes |
|
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changeset
|
1890 // for this region, and set bits for the range |
|
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|
1891 // [ card_idx(start), card_idx(ntams) ) in the card bitmap. |
|
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1892 size_t live_bytes = (ntams - start) * HeapWordSize; |
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1893 hr->add_to_marked_bytes(live_bytes); |
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1894 |
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1895 // Record the new top at conc count |
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1896 hr->set_top_at_conc_mark_count(ntams); |
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1897 |
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1898 // The setting of the bits in the card bitmap takes place below |
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1899 } |
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1900 |
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1901 // Mark the allocated-since-marking portion... |
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1902 if (ntams < top) { |
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1903 // This definitely means the region has live objects. |
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1904 set_bit_for_region(hr); |
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1905 } |
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1906 |
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1907 // Now set the bits for [start, top] |
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1908 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1909 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top); |
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1910 set_card_bitmap_range(start_idx, last_idx); |
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1911 |
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1912 // Set the bit for the region if it contains live data |
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1913 if (hr->next_marked_bytes() > 0) { |
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1914 set_bit_for_region(hr); |
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1915 } |
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1916 |
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1917 _total_words_done += words_done; |
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1918 _total_used_bytes += hr->used(); |
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1919 _total_live_bytes += hr->next_marked_bytes(); |
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1920 |
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1921 return false; |
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1922 } |
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1923 |
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1924 size_t total_words_done() const { return _total_words_done; } |
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1925 size_t total_live_bytes() const { return _total_live_bytes; } |
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1926 size_t total_used_bytes() const { return _total_used_bytes; } |
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1927 }; |
| 342 | 1928 |
| 1929 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1930 protected: | |
| 1931 G1CollectedHeap* _g1h; | |
|
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1932 ConcurrentMark* _cm; |
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1933 BitMap* _actual_region_bm; |
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1934 BitMap* _actual_card_bm; |
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1935 |
|
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1936 uint _n_workers; |
|
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1937 |
| 342 | 1938 size_t *_live_bytes; |
| 1939 size_t *_used_bytes; | |
|
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1940 |
| 342 | 1941 public: |
|
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1942 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1943 : AbstractGangTask("G1 final counting"), |
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1944 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1945 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1946 _n_workers(0) { |
|
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1947 // Use the value already set as the number of active threads |
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1948 // in the call to run_task(). Needed for the allocation of |
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1949 // _live_bytes and _used_bytes. |
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1950 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1951 assert( _g1h->workers()->active_workers() > 0, |
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1952 "Should have been previously set"); |
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1953 _n_workers = _g1h->workers()->active_workers(); |
|
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1954 } else { |
| 342 | 1955 _n_workers = 1; |
|
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1956 } |
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1957 |
| 342 | 1958 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); |
| 1959 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
| 1960 } | |
| 1961 | |
| 1962 ~G1ParFinalCountTask() { | |
| 1963 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
| 1964 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
| 1965 } | |
| 1966 | |
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1967 void work(uint worker_id) { |
|
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1968 assert(worker_id < _n_workers, "invariant"); |
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1969 |
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1970 FinalCountDataUpdateClosure final_update_cl(_cm, |
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1971 _actual_region_bm, |
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1972 _actual_card_bm); |
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1973 |
|
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1974 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1975 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1976 worker_id, |
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1977 _n_workers, |
| 355 | 1978 HeapRegion::FinalCountClaimValue); |
| 342 | 1979 } else { |
|
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1980 _g1h->heap_region_iterate(&final_update_cl); |
| 342 | 1981 } |
|
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1982 |
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1983 _live_bytes[worker_id] = final_update_cl.total_live_bytes(); |
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1984 _used_bytes[worker_id] = final_update_cl.total_used_bytes(); |
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1985 } |
|
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1986 |
| 342 | 1987 size_t live_bytes() { |
| 1988 size_t live_bytes = 0; | |
|
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1989 for (uint i = 0; i < _n_workers; ++i) |
| 342 | 1990 live_bytes += _live_bytes[i]; |
| 1991 return live_bytes; | |
| 1992 } | |
|
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1993 |
| 342 | 1994 size_t used_bytes() { |
| 1995 size_t used_bytes = 0; | |
|
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1996 for (uint i = 0; i < _n_workers; ++i) |
| 342 | 1997 used_bytes += _used_bytes[i]; |
| 1998 return used_bytes; | |
| 1999 } | |
| 2000 }; | |
| 2001 | |
| 2002 class G1ParNoteEndTask; | |
| 2003 | |
| 2004 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 2005 G1CollectedHeap* _g1; | |
| 2006 int _worker_num; | |
| 2007 size_t _max_live_bytes; | |
| 2008 size_t _regions_claimed; | |
| 2009 size_t _freed_bytes; | |
| 2173 | 2010 FreeRegionList* _local_cleanup_list; |
| 4072 | 2011 OldRegionSet* _old_proxy_set; |
| 2173 | 2012 HumongousRegionSet* _humongous_proxy_set; |
| 2013 HRRSCleanupTask* _hrrs_cleanup_task; | |
| 342 | 2014 double _claimed_region_time; |
| 2015 double _max_region_time; | |
| 2016 | |
| 2017 public: | |
| 2018 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 2019 int worker_num, |
| 2020 FreeRegionList* local_cleanup_list, | |
| 4072 | 2021 OldRegionSet* old_proxy_set, |
| 2173 | 2022 HumongousRegionSet* humongous_proxy_set, |
|
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2023 HRRSCleanupTask* hrrs_cleanup_task) : |
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2024 _g1(g1), _worker_num(worker_num), |
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2025 _max_live_bytes(0), _regions_claimed(0), |
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2026 _freed_bytes(0), |
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2027 _claimed_region_time(0.0), _max_region_time(0.0), |
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2028 _local_cleanup_list(local_cleanup_list), |
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2029 _old_proxy_set(old_proxy_set), |
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2030 _humongous_proxy_set(humongous_proxy_set), |
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2031 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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2032 |
| 342 | 2033 size_t freed_bytes() { return _freed_bytes; } |
| 2034 | |
|
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2035 bool doHeapRegion(HeapRegion *hr) { |
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2036 // We use a claim value of zero here because all regions |
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2037 // were claimed with value 1 in the FinalCount task. |
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2038 hr->reset_gc_time_stamp(); |
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2039 if (!hr->continuesHumongous()) { |
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2040 double start = os::elapsedTime(); |
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2041 _regions_claimed++; |
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2042 hr->note_end_of_marking(); |
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2043 _max_live_bytes += hr->max_live_bytes(); |
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2044 _g1->free_region_if_empty(hr, |
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2045 &_freed_bytes, |
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2046 _local_cleanup_list, |
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2047 _old_proxy_set, |
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2048 _humongous_proxy_set, |
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2049 _hrrs_cleanup_task, |
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2050 true /* par */); |
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2051 double region_time = (os::elapsedTime() - start); |
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2052 _claimed_region_time += region_time; |
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|
2053 if (region_time > _max_region_time) { |
|
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2054 _max_region_time = region_time; |
|
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|
2055 } |
|
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|
2056 } |
|
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|
2057 return false; |
|
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|
2058 } |
| 342 | 2059 |
| 2060 size_t max_live_bytes() { return _max_live_bytes; } | |
| 2061 size_t regions_claimed() { return _regions_claimed; } | |
| 2062 double claimed_region_time_sec() { return _claimed_region_time; } | |
| 2063 double max_region_time_sec() { return _max_region_time; } | |
| 2064 }; | |
| 2065 | |
| 2066 class G1ParNoteEndTask: public AbstractGangTask { | |
| 2067 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 2068 |
| 342 | 2069 protected: |
| 2070 G1CollectedHeap* _g1h; | |
| 2071 size_t _max_live_bytes; | |
| 2072 size_t _freed_bytes; | |
| 2152 | 2073 FreeRegionList* _cleanup_list; |
| 2074 | |
| 342 | 2075 public: |
| 2076 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 2077 FreeRegionList* cleanup_list) : |
| 342 | 2078 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 2079 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 2080 |
|
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2081 void work(uint worker_id) { |
| 342 | 2082 double start = os::elapsedTime(); |
| 2173 | 2083 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 4072 | 2084 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
| 2173 | 2085 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
| 2086 HRRSCleanupTask hrrs_cleanup_task; | |
|
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2087 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
| 4072 | 2088 &old_proxy_set, |
| 2173 | 2089 &humongous_proxy_set, |
| 2090 &hrrs_cleanup_task); | |
|
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2091 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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2092 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
|
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2093 _g1h->workers()->active_workers(), |
| 355 | 2094 HeapRegion::NoteEndClaimValue); |
| 342 | 2095 } else { |
| 2096 _g1h->heap_region_iterate(&g1_note_end); | |
| 2097 } | |
| 2098 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 2099 | |
| 2152 | 2100 // Now update the lists |
| 2101 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
| 2102 NULL /* free_list */, | |
| 4072 | 2103 &old_proxy_set, |
| 2173 | 2104 &humongous_proxy_set, |
| 2152 | 2105 true /* par */); |
| 342 | 2106 { |
| 2107 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2108 _max_live_bytes += g1_note_end.max_live_bytes(); | |
| 2109 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 2110 |
|
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2111 // If we iterate over the global cleanup list at the end of |
|
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|
2112 // cleanup to do this printing we will not guarantee to only |
|
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|
2113 // generate output for the newly-reclaimed regions (the list |
|
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|
2114 // might not be empty at the beginning of cleanup; we might |
|
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|
2115 // still be working on its previous contents). So we do the |
|
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|
2116 // printing here, before we append the new regions to the global |
|
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|
2117 // cleanup list. |
|
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2118 |
|
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|
2119 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
|
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|
2120 if (hr_printer->is_active()) { |
|
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|
2121 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
|
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|
2122 while (iter.more_available()) { |
|
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|
2123 HeapRegion* hr = iter.get_next(); |
|
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|
2124 hr_printer->cleanup(hr); |
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|
2125 } |
|
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|
2126 } |
|
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|
2127 |
| 2173 | 2128 _cleanup_list->add_as_tail(&local_cleanup_list); |
| 2129 assert(local_cleanup_list.is_empty(), "post-condition"); | |
| 2130 | |
| 2131 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 2132 } |
| 2133 double end = os::elapsedTime(); | |
| 2134 if (G1PrintParCleanupStats) { | |
| 2135 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
|
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|
2136 "claimed %u regions (tot = %8.3f ms, max = %8.3f ms).\n", |
|
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|
2137 worker_id, start, end, (end-start)*1000.0, |
| 342 | 2138 g1_note_end.regions_claimed(), |
| 2139 g1_note_end.claimed_region_time_sec()*1000.0, | |
| 2140 g1_note_end.max_region_time_sec()*1000.0); | |
| 2141 } | |
| 2142 } | |
| 2143 size_t max_live_bytes() { return _max_live_bytes; } | |
| 2144 size_t freed_bytes() { return _freed_bytes; } | |
| 2145 }; | |
| 2146 | |
| 2147 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 2148 protected: | |
| 2149 G1RemSet* _g1rs; | |
| 2150 BitMap* _region_bm; | |
| 2151 BitMap* _card_bm; | |
| 2152 public: | |
| 2153 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 2154 BitMap* region_bm, BitMap* card_bm) : | |
| 2155 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
|
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|
2156 _region_bm(region_bm), _card_bm(card_bm) { } |
| 342 | 2157 |
|
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|
2158 void work(uint worker_id) { |
|
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|
2159 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2160 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 2161 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 2162 } else { |
| 2163 _g1rs->scrub(_region_bm, _card_bm); | |
| 2164 } | |
| 2165 } | |
| 2166 | |
| 2167 }; | |
| 2168 | |
| 2169 void ConcurrentMark::cleanup() { | |
| 2170 // world is stopped at this checkpoint | |
| 2171 assert(SafepointSynchronize::is_at_safepoint(), | |
| 2172 "world should be stopped"); | |
| 2173 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2174 | |
| 2175 // If a full collection has happened, we shouldn't do this. | |
| 2176 if (has_aborted()) { | |
| 2177 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 2178 return; | |
| 2179 } | |
| 2180 | |
| 4072 | 2181 HRSPhaseSetter x(HRSPhaseCleanup); |
| 2152 | 2182 g1h->verify_region_sets_optional(); |
| 2183 | |
|
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|
2184 if (VerifyDuringGC) { |
|
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|
2185 HandleMark hm; // handle scope |
|
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|
2186 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
|
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|
2187 Universe::heap()->prepare_for_verify(); |
|
3772
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|
2188 Universe::verify(/* allow dirty */ true, |
|
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|
2189 /* silent */ false, |
|
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|
2190 /* option */ VerifyOption_G1UsePrevMarking); |
|
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|
2191 } |
|
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|
2192 |
| 342 | 2193 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 2194 g1p->record_concurrent_mark_cleanup_start(); | |
| 2195 | |
| 2196 double start = os::elapsedTime(); | |
| 2197 | |
| 2173 | 2198 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 2199 | |
|
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|
2200 uint n_workers; |
|
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|
2201 |
| 342 | 2202 // Do counting once more with the world stopped for good measure. |
|
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|
2203 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
|
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|
2204 |
|
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|
2205 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2206 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
| 355 | 2207 "sanity check"); |
| 2208 | |
| 4711 | 2209 g1h->set_par_threads(); |
| 2210 n_workers = g1h->n_par_threads(); | |
|
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|
2211 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 2212 "Should not have been reset"); |
| 342 | 2213 g1h->workers()->run_task(&g1_par_count_task); |
|
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|
2214 // Done with the parallel phase so reset to 0. |
| 342 | 2215 g1h->set_par_threads(0); |
| 355 | 2216 |
|
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|
2217 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
| 355 | 2218 "sanity check"); |
| 342 | 2219 } else { |
| 4711 | 2220 n_workers = 1; |
| 342 | 2221 g1_par_count_task.work(0); |
| 2222 } | |
| 2223 | |
|
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|
2224 if (VerifyDuringGC) { |
|
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|
2225 // Verify that the counting data accumulated during marking matches |
|
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|
2226 // that calculated by walking the marking bitmap. |
|
d30fa85f9994
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|
2227 |
|
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|
2228 // Bitmaps to hold expected values |
|
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|
2229 BitMap expected_region_bm(_region_bm.size(), false); |
|
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|
2230 BitMap expected_card_bm(_card_bm.size(), false); |
|
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|
2231 |
|
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|
2232 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
|
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|
2233 &_region_bm, |
|
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|
2234 &_card_bm, |
|
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|
2235 &expected_region_bm, |
|
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|
2236 &expected_card_bm); |
|
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|
2237 |
|
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|
2238 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2239 g1h->set_par_threads((int)n_workers); |
|
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|
2240 g1h->workers()->run_task(&g1_par_verify_task); |
|
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|
2241 // Done with the parallel phase so reset to 0. |
|
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|
2242 g1h->set_par_threads(0); |
|
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|
2243 |
|
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|
2244 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
|
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|
2245 "sanity check"); |
|
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|
2246 } else { |
|
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|
2247 g1_par_verify_task.work(0); |
|
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|
2248 } |
|
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|
2249 |
|
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|
2250 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
|
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|
2251 } |
|
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|
2252 |
| 342 | 2253 size_t known_garbage_bytes = |
| 2254 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
| 2255 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
| 2256 | |
| 2257 size_t start_used_bytes = g1h->used(); | |
| 2258 _at_least_one_mark_complete = true; | |
| 2259 g1h->set_marking_complete(); | |
| 2260 | |
|
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|
2261 ergo_verbose4(ErgoConcCycles, |
|
20213c8a3c40
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|
2262 "finish cleanup", |
|
20213c8a3c40
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|
2263 ergo_format_byte("occupancy") |
|
20213c8a3c40
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|
2264 ergo_format_byte("capacity") |
|
20213c8a3c40
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|
2265 ergo_format_byte_perc("known garbage"), |
|
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|
2266 start_used_bytes, g1h->capacity(), |
|
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2267 known_garbage_bytes, |
|
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|
2268 ((double) known_garbage_bytes / (double) g1h->capacity()) * 100.0); |
|
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|
2269 |
| 342 | 2270 double count_end = os::elapsedTime(); |
| 2271 double this_final_counting_time = (count_end - start); | |
| 2272 if (G1PrintParCleanupStats) { | |
| 2273 gclog_or_tty->print_cr("Cleanup:"); | |
| 2274 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
| 2275 this_final_counting_time*1000.0); | |
| 2276 } | |
| 2277 _total_counting_time += this_final_counting_time; | |
| 2278 | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
2279 if (G1PrintRegionLivenessInfo) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
2280 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
|
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|
2281 _g1h->heap_region_iterate(&cl); |
|
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|
2282 } |
|
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|
2283 |
| 342 | 2284 // Install newly created mark bitMap as "prev". |
| 2285 swapMarkBitMaps(); | |
| 2286 | |
| 2287 g1h->reset_gc_time_stamp(); | |
| 2288 | |
| 2289 // Note end of marking in all heap regions. | |
| 2290 double note_end_start = os::elapsedTime(); | |
| 2152 | 2291 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
1833
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|
2292 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4095
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|
2293 g1h->set_par_threads((int)n_workers); |
| 342 | 2294 g1h->workers()->run_task(&g1_par_note_end_task); |
| 2295 g1h->set_par_threads(0); | |
| 355 | 2296 |
| 2297 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 2298 "sanity check"); | |
| 342 | 2299 } else { |
| 2300 g1_par_note_end_task.work(0); | |
| 2301 } | |
| 2152 | 2302 |
| 2303 if (!cleanup_list_is_empty()) { | |
| 2304 // The cleanup list is not empty, so we'll have to process it | |
| 2305 // concurrently. Notify anyone else that might be wanting free | |
| 2306 // regions that there will be more free regions coming soon. | |
| 2307 g1h->set_free_regions_coming(); | |
| 2308 } | |
| 342 | 2309 double note_end_end = os::elapsedTime(); |
| 2310 if (G1PrintParCleanupStats) { | |
| 2311 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
| 2312 (note_end_end - note_end_start)*1000.0); | |
| 2313 } | |
| 2314 | |
| 2315 // call below, since it affects the metric by which we sort the heap | |
| 2316 // regions. | |
| 2317 if (G1ScrubRemSets) { | |
| 2318 double rs_scrub_start = os::elapsedTime(); | |
| 2319 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
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|
2320 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2321 g1h->set_par_threads((int)n_workers); |
| 342 | 2322 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 2323 g1h->set_par_threads(0); | |
| 355 | 2324 |
| 2325 assert(g1h->check_heap_region_claim_values( | |
| 2326 HeapRegion::ScrubRemSetClaimValue), | |
| 2327 "sanity check"); | |
| 342 | 2328 } else { |
| 2329 g1_par_scrub_rs_task.work(0); | |
| 2330 } | |
| 2331 | |
| 2332 double rs_scrub_end = os::elapsedTime(); | |
| 2333 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 2334 _total_rs_scrub_time += this_rs_scrub_time; | |
| 2335 } | |
| 2336 | |
| 2337 // this will also free any regions totally full of garbage objects, | |
| 2338 // and sort the regions. | |
|
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|
2339 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 2340 |
| 2341 // Statistics. | |
| 2342 double end = os::elapsedTime(); | |
| 2343 _cleanup_times.add((end - start) * 1000.0); | |
| 2344 | |
| 2345 if (PrintGC || PrintGCDetails) { | |
| 2346 g1h->print_size_transition(gclog_or_tty, | |
| 2347 start_used_bytes, | |
| 2348 g1h->used(), | |
| 2349 g1h->capacity()); | |
| 2350 } | |
| 2351 | |
| 2352 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
| 2353 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
| 2354 | |
|
3979
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|
2355 // Clean up will have freed any regions completely full of garbage. |
|
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|
2356 // Update the soft reference policy with the new heap occupancy. |
|
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|
2357 Universe::update_heap_info_at_gc(); |
|
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|
2358 |
| 342 | 2359 // We need to make this be a "collection" so any collection pause that |
| 2360 // races with it goes around and waits for completeCleanup to finish. | |
| 2361 g1h->increment_total_collections(); | |
| 2362 | |
|
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|
2363 // We reclaimed old regions so we should calculate the sizes to make |
|
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|
2364 // sure we update the old gen/space data. |
|
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|
2365 g1h->g1mm()->update_sizes(); |
|
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|
2366 |
| 751 | 2367 if (VerifyDuringGC) { |
|
845
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|
2368 HandleMark hm; // handle scope |
|
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|
2369 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
|
df6caf649ff7
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|
2370 Universe::heap()->prepare_for_verify(); |
|
3772
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7004681: G1: Extend marking verification to Full GCs
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|
2371 Universe::verify(/* allow dirty */ true, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
2372 /* silent */ false, |
|
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|
2373 /* option */ VerifyOption_G1UsePrevMarking); |
| 342 | 2374 } |
| 2152 | 2375 |
| 2376 g1h->verify_region_sets_optional(); | |
| 342 | 2377 } |
| 2378 | |
| 2379 void ConcurrentMark::completeCleanup() { | |
| 2380 if (has_aborted()) return; | |
| 2381 | |
| 2152 | 2382 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 2383 | |
| 2384 _cleanup_list.verify_optional(); | |
| 2361 | 2385 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 2386 |
| 2387 if (G1ConcRegionFreeingVerbose) { | |
| 2388 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
| 2389 "cleanup list has "SIZE_FORMAT" entries", | |
| 2390 _cleanup_list.length()); | |
| 2391 } | |
| 2392 | |
| 2393 // Noone else should be accessing the _cleanup_list at this point, | |
| 2394 // so it's not necessary to take any locks | |
| 2395 while (!_cleanup_list.is_empty()) { | |
| 2396 HeapRegion* hr = _cleanup_list.remove_head(); | |
| 2397 assert(hr != NULL, "the list was not empty"); | |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
2398 hr->par_clear(); |
| 2361 | 2399 tmp_free_list.add_as_tail(hr); |
| 2152 | 2400 |
| 2401 // Instead of adding one region at a time to the secondary_free_list, | |
| 2402 // we accumulate them in the local list and move them a few at a | |
| 2403 // time. This also cuts down on the number of notify_all() calls | |
| 2404 // we do during this process. We'll also append the local list when | |
| 2405 // _cleanup_list is empty (which means we just removed the last | |
| 2406 // region from the _cleanup_list). | |
| 2361 | 2407 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 2408 _cleanup_list.is_empty()) { |
| 2409 if (G1ConcRegionFreeingVerbose) { | |
| 2410 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
| 2411 "appending "SIZE_FORMAT" entries to the " | |
| 2412 "secondary_free_list, clean list still has " | |
| 2413 SIZE_FORMAT" entries", | |
| 2361 | 2414 tmp_free_list.length(), |
| 2152 | 2415 _cleanup_list.length()); |
| 342 | 2416 } |
| 2152 | 2417 |
| 2418 { | |
| 2419 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 2361 | 2420 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
| 2152 | 2421 SecondaryFreeList_lock->notify_all(); |
| 2422 } | |
| 2423 | |
| 2424 if (G1StressConcRegionFreeing) { | |
| 2425 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 2426 os::sleep(Thread::current(), (jlong) 1, false); | |
| 2427 } | |
| 2428 } | |
| 342 | 2429 } |
| 2430 } | |
| 2361 | 2431 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 2432 } |
| 2433 | |
|
2174
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|
2434 // Support closures for reference procssing in G1 |
|
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|
2435 |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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diff
changeset
|
2436 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
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diff
changeset
|
2437 HeapWord* addr = (HeapWord*)obj; |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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1974
diff
changeset
|
2438 return addr != NULL && |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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diff
changeset
|
2439 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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diff
changeset
|
2440 } |
| 342 | 2441 |
| 2442 class G1CMKeepAliveClosure: public OopClosure { | |
| 2443 G1CollectedHeap* _g1; | |
| 2444 ConcurrentMark* _cm; | |
| 2445 public: | |
|
4836
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|
2446 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
|
d30fa85f9994
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|
2447 _g1(g1), _cm(cm) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
2448 assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
2449 } |
| 342 | 2450 |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2451 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2452 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2453 |
|
df6caf649ff7
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|
2454 template <class T> void do_oop_work(T* p) { |
|
2174
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|
2455 oop obj = oopDesc::load_decode_heap_oop(p); |
|
234761c55641
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|
2456 HeapWord* addr = (HeapWord*)obj; |
|
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|
2457 |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
2458 if (_cm->verbose_high()) { |
|
2174
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|
2459 gclog_or_tty->print_cr("\t[0] we're looking at location " |
|
3776
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|
2460 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
2461 p, (void*) obj); |
|
23d434c6290d
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|
2462 } |
|
2174
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|
2463 |
|
234761c55641
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diff
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|
2464 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
|
4836
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|
2465 _cm->mark_and_count(obj); |
|
2174
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changeset
|
2466 _cm->mark_stack_push(obj); |
| 342 | 2467 } |
| 2468 } | |
| 2469 }; | |
| 2470 | |
| 2471 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
|
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|
2472 ConcurrentMark* _cm; |
| 342 | 2473 CMMarkStack* _markStack; |
| 2474 G1CMKeepAliveClosure* _oopClosure; | |
| 2475 public: | |
|
4836
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4830
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|
2476 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
| 342 | 2477 G1CMKeepAliveClosure* oopClosure) : |
|
4836
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|
2478 _cm(cm), |
| 342 | 2479 _markStack(markStack), |
|
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|
2480 _oopClosure(oopClosure) { } |
| 342 | 2481 |
| 2482 void do_void() { | |
|
4836
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|
2483 _markStack->drain((OopClosure*)_oopClosure, _cm->nextMarkBitMap(), false); |
| 342 | 2484 } |
| 2485 }; | |
| 2486 | |
|
2174
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|
2487 // 'Keep Alive' closure used by parallel reference processing. |
|
234761c55641
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diff
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|
2488 // An instance of this closure is used in the parallel reference processing |
|
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|
2489 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
|
234761c55641
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|
2490 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
|
234761c55641
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diff
changeset
|
2491 // placed on to discovered ref lists once so we can mark and push with no |
|
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|
2492 // need to check whether the object has already been marked. Using the |
|
234761c55641
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diff
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|
2493 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
|
234761c55641
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|
2494 // operating on the global mark stack. This means that an individual |
|
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changeset
|
2495 // worker would be doing lock-free pushes while it processes its own |
|
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changeset
|
2496 // discovered ref list followed by drain call. If the discovered ref lists |
|
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diff
changeset
|
2497 // are unbalanced then this could cause interference with the other |
|
234761c55641
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2152
diff
changeset
|
2498 // workers. Using a CMTask (and its embedded local data structures) |
|
234761c55641
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2152
diff
changeset
|
2499 // avoids that potential interference. |
|
234761c55641
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diff
changeset
|
2500 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
|
234761c55641
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2152
diff
changeset
|
2501 ConcurrentMark* _cm; |
|
234761c55641
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2502 CMTask* _task; |
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2503 int _ref_counter_limit; |
|
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2504 int _ref_counter; |
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|
2505 public: |
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2506 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
|
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|
2507 _cm(cm), _task(task), |
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2508 _ref_counter_limit(G1RefProcDrainInterval) { |
|
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2509 assert(_ref_counter_limit > 0, "sanity"); |
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2510 _ref_counter = _ref_counter_limit; |
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2511 } |
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2512 |
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2513 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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2514 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2515 |
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2516 template <class T> void do_oop_work(T* p) { |
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2517 if (!_cm->has_overflown()) { |
|
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2518 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2519 if (_cm->verbose_high()) { |
|
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2520 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2521 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2522 _task->task_id(), p, (void*) obj); |
|
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2523 } |
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2524 |
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2525 _task->deal_with_reference(obj); |
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|
2526 _ref_counter--; |
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|
2527 |
|
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2528 if (_ref_counter == 0) { |
|
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2529 // We have dealt with _ref_counter_limit references, pushing them and objects |
|
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2530 // reachable from them on to the local stack (and possibly the global stack). |
|
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2531 // Call do_marking_step() to process these entries. We call the routine in a |
|
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2532 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
|
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2533 // with the entries that we've pushed as a result of the deal_with_reference |
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2534 // calls above) or we overflow. |
|
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2535 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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|
2536 // while there may still be some work to do. (See the comment at the |
|
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2537 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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|
2538 // is reaching the specified time target.) It is only when |
|
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2539 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2540 // that the marking has completed. |
|
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|
2541 do { |
|
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|
2542 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
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|
2543 _task->do_marking_step(mark_step_duration_ms, |
|
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|
2544 false /* do_stealing */, |
|
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|
2545 false /* do_termination */); |
|
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|
2546 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2547 _ref_counter = _ref_counter_limit; |
|
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|
2548 } |
|
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|
2549 } else { |
|
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|
2550 if (_cm->verbose_high()) { |
|
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|
2551 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
|
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|
2552 } |
|
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|
2553 } |
|
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|
2554 } |
|
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|
2555 }; |
|
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|
2556 |
|
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|
2557 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
|
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|
2558 ConcurrentMark* _cm; |
|
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|
2559 CMTask* _task; |
|
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|
2560 public: |
|
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|
2561 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
|
4836
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|
2562 _cm(cm), _task(task) { } |
|
2174
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|
2563 |
|
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|
2564 void do_void() { |
|
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|
2565 do { |
|
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|
2566 if (_cm->verbose_high()) { |
|
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|
2567 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
|
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|
2568 _task->task_id()); |
|
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|
2569 } |
|
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|
2570 |
|
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|
2571 // We call CMTask::do_marking_step() to completely drain the local and |
|
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|
2572 // global marking stacks. The routine is called in a loop, which we'll |
|
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|
2573 // exit if there's nothing more to do (i.e. we'completely drained the |
|
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|
2574 // entries that were pushed as a result of applying the |
|
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|
2575 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
|
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|
2576 // lists above) or we overflow the global marking stack. |
|
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|
2577 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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|
2578 // while there may still be some work to do. (See the comment at the |
|
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|
2579 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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|
2580 // is reaching the specified time target.) It is only when |
|
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|
2581 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2582 // that the marking has completed. |
|
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|
2583 |
|
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|
2584 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2585 true /* do_stealing */, |
|
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|
2586 true /* do_termination */); |
|
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|
2587 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2588 } |
|
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|
2589 }; |
|
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|
2590 |
|
3979
4dfb2df418f2
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|
2591 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
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|
2592 // reference processing at the end of G1 concurrent marking |
|
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|
2593 |
|
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|
2594 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
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|
2595 private: |
|
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|
2596 G1CollectedHeap* _g1h; |
|
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|
2597 ConcurrentMark* _cm; |
|
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|
2598 WorkGang* _workers; |
|
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|
2599 int _active_workers; |
|
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|
2600 |
|
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|
2601 public: |
|
3979
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|
2602 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
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|
2603 ConcurrentMark* cm, |
|
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|
2604 WorkGang* workers, |
|
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|
2605 int n_workers) : |
|
4093
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|
2606 _g1h(g1h), _cm(cm), |
|
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|
2607 _workers(workers), _active_workers(n_workers) { } |
|
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|
2608 |
|
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|
2609 // Executes the given task using concurrent marking worker threads. |
|
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changeset
|
2610 virtual void execute(ProcessTask& task); |
|
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|
2611 virtual void execute(EnqueueTask& task); |
|
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|
2612 }; |
|
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|
2613 |
|
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|
2614 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
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|
2615 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
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|
2616 ProcessTask& _proc_task; |
|
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|
2617 G1CollectedHeap* _g1h; |
|
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|
2618 ConcurrentMark* _cm; |
|
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|
2619 |
|
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|
2620 public: |
|
3979
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|
2621 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
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|
2622 G1CollectedHeap* g1h, |
|
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|
2623 ConcurrentMark* cm) : |
|
2174
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|
2624 AbstractGangTask("Process reference objects in parallel"), |
|
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|
2625 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
|
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|
2626 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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4711
diff
changeset
|
2627 virtual void work(uint worker_id) { |
|
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2628 CMTask* marking_task = _cm->task(worker_id); |
|
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|
2629 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
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2630 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
|
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|
2631 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
|
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2632 |
|
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|
2633 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
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|
2634 } |
|
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|
2635 }; |
|
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|
2636 |
|
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|
2637 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
2174
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|
2638 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
2639 |
|
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|
2640 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
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|
2641 |
|
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|
2642 // We need to reset the phase for each task execution so that |
|
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|
2643 // the termination protocol of CMTask::do_marking_step works. |
|
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|
2644 _cm->set_phase(_active_workers, false /* concurrent */); |
|
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|
2645 _g1h->set_par_threads(_active_workers); |
|
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|
2646 _workers->run_task(&proc_task_proxy); |
|
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|
2647 _g1h->set_par_threads(0); |
|
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|
2648 } |
|
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|
2649 |
|
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|
2650 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
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|
2651 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
2652 EnqueueTask& _enq_task; |
|
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|
2653 |
|
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|
2654 public: |
|
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|
2655 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
2174
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|
2656 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
2657 _enq_task(enq_task) { } |
|
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2658 |
|
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|
2659 virtual void work(uint worker_id) { |
|
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|
2660 _enq_task.work(worker_id); |
|
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|
2661 } |
|
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|
2662 }; |
|
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|
2663 |
|
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|
2664 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
2665 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
2666 |
|
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|
2667 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
2668 |
|
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|
2669 _g1h->set_par_threads(_active_workers); |
|
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|
2670 _workers->run_task(&enq_task_proxy); |
|
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|
2671 _g1h->set_par_threads(0); |
|
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|
2672 } |
|
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|
2673 |
| 342 | 2674 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
| 2675 ResourceMark rm; | |
| 2676 HandleMark hm; | |
|
3975
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|
2677 |
|
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|
2678 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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|
2679 |
|
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|
2680 // Is alive closure. |
|
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|
2681 G1CMIsAliveClosure g1_is_alive(g1h); |
|
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|
2682 |
|
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|
2683 // Inner scope to exclude the cleaning of the string and symbol |
|
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|
2684 // tables from the displayed time. |
|
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|
2685 { |
|
1847b501ae74
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|
2686 bool verbose = PrintGC && PrintGCDetails; |
|
1847b501ae74
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|
2687 if (verbose) { |
|
1847b501ae74
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|
2688 gclog_or_tty->put(' '); |
|
1847b501ae74
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|
2689 } |
|
1847b501ae74
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|
2690 TraceTime t("GC ref-proc", verbose, false, gclog_or_tty); |
|
1847b501ae74
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|
2691 |
|
3979
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|
2692 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
3975
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|
2693 |
|
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|
2694 // See the comment in G1CollectedHeap::ref_processing_init() |
|
1847b501ae74
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|
2695 // about how reference processing currently works in G1. |
|
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changeset
|
2696 |
|
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changeset
|
2697 // Process weak references. |
|
1847b501ae74
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|
2698 rp->setup_policy(clear_all_soft_refs); |
|
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|
2699 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
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|
2700 |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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4830
diff
changeset
|
2701 G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
|
3975
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|
2702 G1CMDrainMarkingStackClosure |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2703 g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
|
3975
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|
2704 |
|
1847b501ae74
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changeset
|
2705 // We use the work gang from the G1CollectedHeap and we utilize all |
|
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changeset
|
2706 // the worker threads. |
|
4728
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|
2707 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
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changeset
|
2708 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
|
3975
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|
2709 |
|
4093
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|
2710 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
3979
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|
2711 g1h->workers(), active_workers); |
|
3975
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changeset
|
2712 |
|
1847b501ae74
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diff
changeset
|
2713 if (rp->processing_is_mt()) { |
|
1847b501ae74
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diff
changeset
|
2714 // Set the degree of MT here. If the discovery is done MT, there |
|
1847b501ae74
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changeset
|
2715 // may have been a different number of threads doing the discovery |
|
1847b501ae74
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|
2716 // and a different number of discovered lists may have Ref objects. |
|
1847b501ae74
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changeset
|
2717 // That is OK as long as the Reference lists are balanced (see |
|
1847b501ae74
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|
2718 // balance_all_queues() and balance_queues()). |
|
1847b501ae74
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|
2719 rp->set_active_mt_degree(active_workers); |
|
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|
2720 |
|
1847b501ae74
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|
2721 rp->process_discovered_references(&g1_is_alive, |
|
2174
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|
2722 &g1_keep_alive, |
|
234761c55641
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|
2723 &g1_drain_mark_stack, |
|
234761c55641
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|
2724 &par_task_executor); |
|
234761c55641
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|
2725 |
|
3975
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changeset
|
2726 // The work routines of the parallel keep_alive and drain_marking_stack |
|
1847b501ae74
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|
2727 // will set the has_overflown flag if we overflow the global marking |
|
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changeset
|
2728 // stack. |
|
1847b501ae74
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diff
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|
2729 } else { |
|
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|
2730 rp->process_discovered_references(&g1_is_alive, |
|
1847b501ae74
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|
2731 &g1_keep_alive, |
|
1847b501ae74
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diff
changeset
|
2732 &g1_drain_mark_stack, |
|
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changeset
|
2733 NULL); |
|
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|
2734 } |
|
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diff
changeset
|
2735 |
|
1847b501ae74
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changeset
|
2736 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
1847b501ae74
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|
2737 "mark stack should be empty (unless it overflowed)"); |
|
1847b501ae74
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changeset
|
2738 if (_markStack.overflow()) { |
|
1847b501ae74
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diff
changeset
|
2739 // Should have been done already when we tried to push an |
|
1847b501ae74
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diff
changeset
|
2740 // entry on to the global mark stack. But let's do it again. |
|
1847b501ae74
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changeset
|
2741 set_has_overflown(); |
|
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diff
changeset
|
2742 } |
|
1847b501ae74
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diff
changeset
|
2743 |
|
1847b501ae74
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diff
changeset
|
2744 if (rp->processing_is_mt()) { |
|
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changeset
|
2745 assert(rp->num_q() == active_workers, "why not"); |
|
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|
2746 rp->enqueue_discovered_references(&par_task_executor); |
|
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|
2747 } else { |
|
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changeset
|
2748 rp->enqueue_discovered_references(); |
|
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changeset
|
2749 } |
|
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diff
changeset
|
2750 |
|
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changeset
|
2751 rp->verify_no_references_recorded(); |
|
3979
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|
2752 assert(!rp->discovery_enabled(), "Post condition"); |
|
2174
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|
2753 } |
|
234761c55641
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changeset
|
2754 |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2755 // Now clean up stale oops in StringTable |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2756 StringTable::unlink(&g1_is_alive); |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2757 // Clean up unreferenced symbols in symbol table. |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2758 SymbolTable::unlink(); |
| 342 | 2759 } |
| 2760 | |
| 2761 void ConcurrentMark::swapMarkBitMaps() { | |
| 2762 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2763 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2764 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2765 } | |
| 2766 | |
| 2767 class CMRemarkTask: public AbstractGangTask { | |
| 2768 private: | |
| 2769 ConcurrentMark *_cm; | |
| 2770 | |
| 2771 public: | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2772 void work(uint worker_id) { |
| 342 | 2773 // Since all available tasks are actually started, we should |
| 2774 // only proceed if we're supposed to be actived. | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2775 if (worker_id < _cm->active_tasks()) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2776 CMTask* task = _cm->task(worker_id); |
| 342 | 2777 task->record_start_time(); |
| 2778 do { | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2779 task->do_marking_step(1000000000.0 /* something very large */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2780 true /* do_stealing */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2781 true /* do_termination */); |
| 342 | 2782 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2783 // If we overflow, then we do not want to restart. We instead | |
| 2784 // want to abort remark and do concurrent marking again. | |
| 2785 task->record_end_time(); | |
| 2786 } | |
| 2787 } | |
| 2788 | |
| 4711 | 2789 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2790 AbstractGangTask("Par Remark"), _cm(cm) { |
| 4711 | 2791 _cm->terminator()->reset_for_reuse(active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2792 } |
| 342 | 2793 }; |
| 2794 | |
| 2795 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2796 ResourceMark rm; | |
| 2797 HandleMark hm; | |
| 2798 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2799 | |
| 2800 g1h->ensure_parsability(false); | |
| 2801 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2802 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2803 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2804 // this is remark, so we'll use up all active threads |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2805 uint active_workers = g1h->workers()->active_workers(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2806 if (active_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2807 assert(active_workers > 0, "Should have been set earlier"); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2808 active_workers = (uint) ParallelGCThreads; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2809 g1h->workers()->set_active_workers(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2810 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2811 set_phase(active_workers, false /* concurrent */); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2812 // Leave _parallel_marking_threads at it's |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2813 // value originally calculated in the ConcurrentMark |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2814 // constructor and pass values of the active workers |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2815 // through the gang in the task. |
| 342 | 2816 |
| 4711 | 2817 CMRemarkTask remarkTask(this, active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2818 g1h->set_par_threads(active_workers); |
| 342 | 2819 g1h->workers()->run_task(&remarkTask); |
| 2820 g1h->set_par_threads(0); | |
| 2821 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2822 G1CollectedHeap::StrongRootsScope srs(g1h); |
| 342 | 2823 // this is remark, so we'll use up all available threads |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2824 uint active_workers = 1; |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2825 set_phase(active_workers, false /* concurrent */); |
| 342 | 2826 |
| 4711 | 2827 CMRemarkTask remarkTask(this, active_workers); |
| 342 | 2828 // We will start all available threads, even if we decide that the |
| 2829 // active_workers will be fewer. The extra ones will just bail out | |
| 2830 // immediately. | |
| 2831 remarkTask.work(0); | |
| 2832 } | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2833 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2834 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2835 |
| 2836 print_stats(); | |
| 2837 | |
| 2838 #if VERIFY_OBJS_PROCESSED | |
| 2839 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
| 2840 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
| 2841 _scan_obj_cl.objs_processed, | |
| 2842 ThreadLocalObjQueue::objs_enqueued); | |
| 2843 guarantee(_scan_obj_cl.objs_processed == | |
| 2844 ThreadLocalObjQueue::objs_enqueued, | |
| 2845 "Different number of objs processed and enqueued."); | |
| 2846 } | |
| 2847 #endif | |
| 2848 } | |
| 2849 | |
| 1044 | 2850 #ifndef PRODUCT |
| 2851 | |
| 1388 | 2852 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2853 private: |
| 2854 G1CollectedHeap* _g1h; | |
| 2855 outputStream* _out; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2856 VerifyOption _vo; |
| 1388 | 2857 bool _all; |
| 342 | 2858 |
| 2859 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2860 PrintReachableOopClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2861 VerifyOption vo, |
| 1388 | 2862 bool all) : |
| 1044 | 2863 _g1h(G1CollectedHeap::heap()), |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2864 _out(out), _vo(vo), _all(all) { } |
| 342 | 2865 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2866 void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2867 void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2868 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2869 template <class T> void do_oop_work(T* p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2870 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2871 const char* str = NULL; |
| 2872 const char* str2 = ""; | |
| 2873 | |
| 1388 | 2874 if (obj == NULL) { |
| 2875 str = ""; | |
| 2876 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2877 str = " O"; | |
| 2878 } else { | |
| 342 | 2879 HeapRegion* hr = _g1h->heap_region_containing(obj); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2880 guarantee(hr != NULL, "invariant"); |
| 1044 | 2881 bool over_tams = false; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2882 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2883 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2884 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2885 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2886 over_tams = hr->obj_allocated_since_prev_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2887 marked = _g1h->isMarkedPrev(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2888 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2889 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2890 over_tams = hr->obj_allocated_since_next_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2891 marked = _g1h->isMarkedNext(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2892 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2893 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2894 marked = obj->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2895 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2896 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2897 ShouldNotReachHere(); |
| 1044 | 2898 } |
| 2899 | |
| 2900 if (over_tams) { | |
| 1388 | 2901 str = " >"; |
| 2902 if (marked) { | |
| 342 | 2903 str2 = " AND MARKED"; |
| 1044 | 2904 } |
| 1388 | 2905 } else if (marked) { |
| 2906 str = " M"; | |
| 1044 | 2907 } else { |
| 1388 | 2908 str = " NOT"; |
| 1044 | 2909 } |
| 342 | 2910 } |
| 2911 | |
| 1388 | 2912 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
| 342 | 2913 p, (void*) obj, str, str2); |
| 2914 } | |
| 2915 }; | |
| 2916 | |
| 1388 | 2917 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2918 private: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2919 G1CollectedHeap* _g1h; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2920 outputStream* _out; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2921 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2922 bool _all; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2923 HeapRegion* _hr; |
| 342 | 2924 |
| 2925 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2926 PrintReachableObjectClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2927 VerifyOption vo, |
| 1388 | 2928 bool all, |
| 2929 HeapRegion* hr) : | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2930 _g1h(G1CollectedHeap::heap()), |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2931 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2932 |
| 2933 void do_object(oop o) { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2934 bool over_tams = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2935 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2936 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2937 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2938 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2939 over_tams = _hr->obj_allocated_since_prev_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2940 marked = _g1h->isMarkedPrev(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2941 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2942 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2943 over_tams = _hr->obj_allocated_since_next_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2944 marked = _g1h->isMarkedNext(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2945 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2946 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2947 marked = o->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2948 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2949 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2950 ShouldNotReachHere(); |
| 1388 | 2951 } |
| 2952 bool print_it = _all || over_tams || marked; | |
| 2953 | |
| 2954 if (print_it) { | |
| 2955 _out->print_cr(" "PTR_FORMAT"%s", | |
| 2956 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2957 PrintReachableOopClosure oopCl(_out, _vo, _all); |
| 1388 | 2958 o->oop_iterate(&oopCl); |
| 2959 } | |
| 342 | 2960 } |
| 2961 }; | |
| 2962 | |
| 1388 | 2963 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2964 private: |
| 2965 outputStream* _out; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2966 VerifyOption _vo; |
| 1388 | 2967 bool _all; |
| 342 | 2968 |
| 2969 public: | |
| 2970 bool doHeapRegion(HeapRegion* hr) { | |
| 2971 HeapWord* b = hr->bottom(); | |
| 2972 HeapWord* e = hr->end(); | |
| 2973 HeapWord* t = hr->top(); | |
| 1044 | 2974 HeapWord* p = NULL; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2975 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2976 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2977 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2978 p = hr->prev_top_at_mark_start(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2979 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2980 case VerifyOption_G1UseNextMarking: |
|
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parents:
3771
diff
changeset
|
2981 p = hr->next_top_at_mark_start(); |
|
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7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2982 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2983 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
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|
2984 // When we are verifying marking using the mark word |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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diff
changeset
|
2985 // TAMS has no relevance. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2986 assert(p == NULL, "post-condition"); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2987 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2988 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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changeset
|
2989 ShouldNotReachHere(); |
| 1044 | 2990 } |
| 342 | 2991 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
| 1044 | 2992 "TAMS: "PTR_FORMAT, b, e, t, p); |
| 1388 | 2993 _out->cr(); |
| 2994 | |
| 2995 HeapWord* from = b; | |
| 2996 HeapWord* to = t; | |
| 2997 | |
| 2998 if (to > from) { | |
| 2999 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
| 3000 _out->cr(); | |
|
3772
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parents:
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diff
changeset
|
3001 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 3002 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 3003 _out->cr(); | |
| 3004 } | |
| 342 | 3005 |
| 3006 return false; | |
| 3007 } | |
| 3008 | |
|
3772
6747fd0512e0
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johnc
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3771
diff
changeset
|
3009 PrintReachableRegionClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
3010 VerifyOption vo, |
| 1388 | 3011 bool all) : |
|
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6747fd0512e0
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johnc
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3771
diff
changeset
|
3012 _out(out), _vo(vo), _all(all) { } |
| 342 | 3013 }; |
| 3014 | |
|
3772
6747fd0512e0
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parents:
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diff
changeset
|
3015 static const char* verify_option_to_tams(VerifyOption vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3016 switch (vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3017 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
3018 return "PTAMS"; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3019 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3020 return "NTAMS"; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3021 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3022 return "NONE"; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3023 } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3024 } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3025 |
| 1388 | 3026 void ConcurrentMark::print_reachable(const char* str, |
|
3772
6747fd0512e0
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johnc
parents:
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diff
changeset
|
3027 VerifyOption vo, |
| 1388 | 3028 bool all) { |
| 3029 gclog_or_tty->cr(); | |
| 3030 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 3031 |
| 3032 if (G1PrintReachableBaseFile == NULL) { | |
| 3033 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 3034 return; | |
| 3035 } | |
| 3036 | |
| 3037 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 3038 (JVM_MAXPATHLEN - 1)) { | |
| 3039 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 3040 return; | |
| 3041 } | |
| 3042 | |
| 3043 char file_name[JVM_MAXPATHLEN]; | |
| 3044 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 3045 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 3046 | |
| 3047 fileStream fout(file_name); | |
| 3048 if (!fout.is_open()) { | |
| 3049 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 3050 return; | |
| 3051 } | |
| 3052 | |
| 3053 outputStream* out = &fout; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3054 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
| 1044 | 3055 out->cr(); |
| 3056 | |
| 1388 | 3057 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 3058 out->cr(); |
|
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parents:
3771
diff
changeset
|
3059 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 3060 _g1h->heap_region_iterate(&rcl); |
| 1044 | 3061 out->cr(); |
| 3062 | |
| 3063 gclog_or_tty->print_cr(" done"); | |
| 1388 | 3064 gclog_or_tty->flush(); |
| 342 | 3065 } |
| 3066 | |
| 1044 | 3067 #endif // PRODUCT |
| 3068 | |
| 342 | 3069 // This note is for drainAllSATBBuffers and the code in between. |
| 3070 // In the future we could reuse a task to do this work during an | |
| 3071 // evacuation pause (since now tasks are not active and can be claimed | |
| 3072 // during an evacuation pause). This was a late change to the code and | |
| 3073 // is currently not being taken advantage of. | |
| 3074 | |
| 3075 void ConcurrentMark::deal_with_reference(oop obj) { | |
| 3771 | 3076 if (verbose_high()) { |
| 342 | 3077 gclog_or_tty->print_cr("[global] we're dealing with reference "PTR_FORMAT, |
| 3078 (void*) obj); | |
| 3771 | 3079 } |
| 342 | 3080 |
| 3081 HeapWord* objAddr = (HeapWord*) obj; | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
831
diff
changeset
|
3082 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
| 342 | 3083 if (_g1h->is_in_g1_reserved(objAddr)) { |
| 3771 | 3084 assert(obj != NULL, "null check is implicit"); |
| 3085 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
| 3086 // Only get the containing region if the object is not marked on the | |
| 3087 // bitmap (otherwise, it's a waste of time since we won't do | |
| 3088 // anything with it). | |
| 3089 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
| 3090 if (!hr->obj_allocated_since_next_marking(obj)) { | |
| 3091 if (verbose_high()) { | |
| 3092 gclog_or_tty->print_cr("[global] "PTR_FORMAT" is not considered " | |
| 3093 "marked", (void*) obj); | |
| 3094 } | |
| 3095 | |
| 3096 // we need to mark it first | |
| 3097 if (_nextMarkBitMap->parMark(objAddr)) { | |
| 3098 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 3099 // CAS done in parMark(objAddr) above | |
| 3100 HeapWord* finger = _finger; | |
| 3101 if (objAddr < finger) { | |
| 3102 if (verbose_high()) { | |
| 3103 gclog_or_tty->print_cr("[global] below the global finger " | |
| 3104 "("PTR_FORMAT"), pushing it", finger); | |
| 3105 } | |
| 3106 if (!mark_stack_push(obj)) { | |
| 3107 if (verbose_low()) { | |
| 3108 gclog_or_tty->print_cr("[global] global stack overflow during " | |
| 3109 "deal_with_reference"); | |
| 3110 } | |
| 3111 } | |
| 342 | 3112 } |
| 3113 } | |
| 3114 } | |
| 3115 } | |
| 3116 } | |
| 3117 } | |
| 3118 | |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3119 class CMGlobalObjectClosure : public ObjectClosure { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3120 private: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3121 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3122 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3123 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3124 void do_object(oop obj) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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4830
diff
changeset
|
3125 _cm->deal_with_reference(obj); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3126 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3127 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3128 CMGlobalObjectClosure(ConcurrentMark* cm) : _cm(cm) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3129 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3130 |
| 342 | 3131 void ConcurrentMark::drainAllSATBBuffers() { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3132 guarantee(false, "drainAllSATBBuffers(): don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3133 |
| 342 | 3134 CMGlobalObjectClosure oc(this); |
| 3135 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3136 satb_mq_set.set_closure(&oc); | |
| 3137 | |
| 3138 while (satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
3139 if (verbose_medium()) { |
| 342 | 3140 gclog_or_tty->print_cr("[global] processed an SATB buffer"); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
3141 } |
| 342 | 3142 } |
| 3143 | |
| 3144 // no need to check whether we should do this, as this is only | |
| 3145 // called during an evacuation pause | |
| 3146 satb_mq_set.iterate_closure_all_threads(); | |
| 3147 | |
| 3148 satb_mq_set.set_closure(NULL); | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3149 assert(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 3150 } |
| 3151 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3152 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 3153 // Note we are overriding the read-only view of the prev map here, via |
| 3154 // the cast. | |
| 3155 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3156 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3157 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3158 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 3159 _nextMarkBitMap->clearRange(mr); |
| 3160 } | |
| 3161 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3162 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3163 clearRangePrevBitmap(mr); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3164 clearRangeNextBitmap(mr); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3165 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3166 |
| 342 | 3167 HeapRegion* |
| 3168 ConcurrentMark::claim_region(int task_num) { | |
| 3169 // "checkpoint" the finger | |
| 3170 HeapWord* finger = _finger; | |
| 3171 | |
| 3172 // _heap_end will not change underneath our feet; it only changes at | |
| 3173 // yield points. | |
| 3174 while (finger < _heap_end) { | |
|
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1022
diff
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|
3175 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 3176 |
| 3771 | 3177 // Note on how this code handles humongous regions. In the |
| 3178 // normal case the finger will reach the start of a "starts | |
| 3179 // humongous" (SH) region. Its end will either be the end of the | |
| 3180 // last "continues humongous" (CH) region in the sequence, or the | |
| 3181 // standard end of the SH region (if the SH is the only region in | |
| 3182 // the sequence). That way claim_region() will skip over the CH | |
| 3183 // regions. However, there is a subtle race between a CM thread | |
| 3184 // executing this method and a mutator thread doing a humongous | |
| 3185 // object allocation. The two are not mutually exclusive as the CM | |
| 3186 // thread does not need to hold the Heap_lock when it gets | |
| 3187 // here. So there is a chance that claim_region() will come across | |
| 3188 // a free region that's in the progress of becoming a SH or a CH | |
| 3189 // region. In the former case, it will either | |
| 3190 // a) Miss the update to the region's end, in which case it will | |
| 3191 // visit every subsequent CH region, will find their bitmaps | |
| 3192 // empty, and do nothing, or | |
| 3193 // b) Will observe the update of the region's end (in which case | |
| 3194 // it will skip the subsequent CH regions). | |
| 3195 // If it comes across a region that suddenly becomes CH, the | |
| 3196 // scenario will be similar to b). So, the race between | |
| 3197 // claim_region() and a humongous object allocation might force us | |
| 3198 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 3199 // iterations) but it should not introduce and correctness issues. | |
| 3200 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
| 342 | 3201 HeapWord* bottom = curr_region->bottom(); |
| 3202 HeapWord* end = curr_region->end(); | |
| 3203 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 3204 | |
| 3771 | 3205 if (verbose_low()) { |
| 342 | 3206 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
| 3207 "["PTR_FORMAT", "PTR_FORMAT"), " | |
| 3208 "limit = "PTR_FORMAT, | |
| 3209 task_num, curr_region, bottom, end, limit); | |
| 3771 | 3210 } |
| 3211 | |
| 3212 // Is the gap between reading the finger and doing the CAS too long? | |
| 3213 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 342 | 3214 if (res == finger) { |
| 3215 // we succeeded | |
| 3216 | |
| 3217 // notice that _finger == end cannot be guaranteed here since, | |
| 3218 // someone else might have moved the finger even further | |
|
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1022
diff
changeset
|
3219 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 3220 |
|
3776
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3772
diff
changeset
|
3221 if (verbose_low()) { |
| 342 | 3222 gclog_or_tty->print_cr("[%d] we were successful with region = " |
| 3223 PTR_FORMAT, task_num, curr_region); | |
|
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3772
diff
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|
3224 } |
| 342 | 3225 |
| 3226 if (limit > bottom) { | |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
3227 if (verbose_low()) { |
| 342 | 3228 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
| 3229 "returning it ", task_num, curr_region); | |
|
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3772
diff
changeset
|
3230 } |
| 342 | 3231 return curr_region; |
| 3232 } else { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3233 assert(limit == bottom, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3234 "the region limit should be at bottom"); |
|
3776
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3772
diff
changeset
|
3235 if (verbose_low()) { |
| 342 | 3236 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
| 3237 "returning NULL", task_num, curr_region); | |
|
3776
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3772
diff
changeset
|
3238 } |
| 342 | 3239 // we return NULL and the caller should try calling |
| 3240 // claim_region() again. | |
| 3241 return NULL; | |
| 3242 } | |
| 3243 } else { | |
|
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tonyp
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1022
diff
changeset
|
3244 assert(_finger > finger, "the finger should have moved forward"); |
|
3776
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tonyp
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3772
diff
changeset
|
3245 if (verbose_low()) { |
| 342 | 3246 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
| 3247 "global finger = "PTR_FORMAT", " | |
| 3248 "our finger = "PTR_FORMAT, | |
| 3249 task_num, _finger, finger); | |
|
3776
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|
3250 } |
| 342 | 3251 |
| 3252 // read it again | |
| 3253 finger = _finger; | |
| 3254 } | |
| 3255 } | |
| 3256 | |
| 3257 return NULL; | |
| 3258 } | |
| 3259 | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
3260 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3261 guarantee(false, "invalidate_aborted_regions_in_cset(): " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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changeset
|
3262 "don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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|
3263 |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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diff
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|
3264 bool result = false; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3265 for (int i = 0; i < (int)_max_task_num; ++i) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3266 CMTask* the_task = _tasks[i]; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
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|
3267 MemRegion mr = the_task->aborted_region(); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
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diff
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|
3268 if (mr.start() != NULL) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3269 assert(mr.end() != NULL, "invariant"); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3270 assert(mr.word_size() > 0, "invariant"); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
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|
3271 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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|
3272 assert(hr != NULL, "invariant"); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3273 if (hr->in_collection_set()) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
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|
3274 // The region points into the collection set |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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|
3275 the_task->set_aborted_region(MemRegion()); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
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|
3276 result = true; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
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|
3277 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3278 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3279 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3280 return result; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
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diff
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|
3281 } |
|
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6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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changeset
|
3282 |
|
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6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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|
3283 bool ConcurrentMark::has_aborted_regions() { |
|
4805b9f4779e
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|
3284 for (int i = 0; i < (int)_max_task_num; ++i) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
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changeset
|
3285 CMTask* the_task = _tasks[i]; |
|
4805b9f4779e
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johnc
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|
3286 MemRegion mr = the_task->aborted_region(); |
|
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johnc
parents:
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|
3287 if (mr.start() != NULL) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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diff
changeset
|
3288 assert(mr.end() != NULL, "invariant"); |
|
4805b9f4779e
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johnc
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|
3289 assert(mr.word_size() > 0, "invariant"); |
|
4805b9f4779e
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johnc
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|
3290 return true; |
|
4805b9f4779e
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johnc
parents:
1833
diff
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|
3291 } |
|
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johnc
parents:
1833
diff
changeset
|
3292 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
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diff
changeset
|
3293 return false; |
|
4805b9f4779e
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johnc
parents:
1833
diff
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|
3294 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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changeset
|
3295 |
| 342 | 3296 void ConcurrentMark::oops_do(OopClosure* cl) { |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3297 if (_markStack.size() > 0 && verbose_low()) { |
| 342 | 3298 gclog_or_tty->print_cr("[global] scanning the global marking stack, " |
| 3299 "size = %d", _markStack.size()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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|
3300 } |
| 342 | 3301 // we first iterate over the contents of the mark stack... |
| 3302 _markStack.oops_do(cl); | |
| 3303 | |
| 3304 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3305 OopTaskQueue* queue = _task_queues->queue((int)i); | |
| 3306 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
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|
3307 if (queue->size() > 0 && verbose_low()) { |
| 342 | 3308 gclog_or_tty->print_cr("[global] scanning task queue of task %d, " |
| 3309 "size = %d", i, queue->size()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
3310 } |
| 342 | 3311 |
| 3312 // ...then over the contents of the all the task queues. | |
| 3313 queue->oops_do(cl); | |
| 3314 } | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
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|
3315 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
3316 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
3317 #ifndef PRODUCT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
3318 enum VerifyNoCSetOopsPhase { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
3319 VerifyNoCSetOopsStack, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
3320 VerifyNoCSetOopsQueues, |
|
2ace1c4ee8da
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diff
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|
3321 VerifyNoCSetOopsSATBCompleted, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3322 VerifyNoCSetOopsSATBThread |
|
2ace1c4ee8da
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parents:
4783
diff
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|
3323 }; |
|
2ace1c4ee8da
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parents:
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diff
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|
3324 |
|
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3325 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
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|
3326 private: |
|
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3327 G1CollectedHeap* _g1h; |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
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|
3328 VerifyNoCSetOopsPhase _phase; |
|
2ace1c4ee8da
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diff
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|
3329 int _info; |
|
2ace1c4ee8da
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parents:
4783
diff
changeset
|
3330 |
|
2ace1c4ee8da
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diff
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|
3331 const char* phase_str() { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3332 switch (_phase) { |
|
2ace1c4ee8da
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parents:
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diff
changeset
|
3333 case VerifyNoCSetOopsStack: return "Stack"; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3334 case VerifyNoCSetOopsQueues: return "Queue"; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3335 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
3336 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3337 default: ShouldNotReachHere(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3338 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3339 return NULL; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3340 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3341 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3342 void do_object_work(oop obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3343 guarantee(!_g1h->obj_in_cs(obj), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3344 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3345 (void*) obj, phase_str(), _info)); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3346 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3347 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3348 public: |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3349 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3350 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3351 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3352 _phase = phase; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3353 _info = info; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3354 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3355 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3356 virtual void do_oop(oop* p) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3357 oop obj = oopDesc::load_decode_heap_oop(p); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3358 do_object_work(obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3359 } |
|
2ace1c4ee8da
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parents:
4783
diff
changeset
|
3360 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3361 virtual void do_oop(narrowOop* p) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3362 // We should not come across narrow oops while scanning marking |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
3363 // stacks and SATB buffers. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4783
diff
changeset
|
3364 ShouldNotReachHere(); |
|
2ace1c4ee8da
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4783
diff
changeset
|
3365 } |
|
2ace1c4ee8da
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4783
diff
changeset
|
3366 |
|
2ace1c4ee8da
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parents:
4783
diff
changeset
|
3367 virtual void do_object(oop obj) { |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3368 do_object_work(obj); |
|
2ace1c4ee8da
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parents:
4783
diff
changeset
|
3369 } |
|
2ace1c4ee8da
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4783
diff
changeset
|
3370 }; |
|
2ace1c4ee8da
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4783
diff
changeset
|
3371 |
|
2ace1c4ee8da
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4783
diff
changeset
|
3372 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
2ace1c4ee8da
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tonyp
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4783
diff
changeset
|
3373 bool verify_enqueued_buffers, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3374 bool verify_thread_buffers, |
|
2ace1c4ee8da
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4783
diff
changeset
|
3375 bool verify_fingers) { |
|
2ace1c4ee8da
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tonyp
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4783
diff
changeset
|
3376 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3377 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
2ace1c4ee8da
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parents:
4783
diff
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|
3378 return; |
| 342 | 3379 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
3380 |
|
4787
2ace1c4ee8da
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parents:
4783
diff
changeset
|
3381 VerifyNoCSetOopsClosure cl; |
|
2ace1c4ee8da
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4783
diff
changeset
|
3382 |
|
2ace1c4ee8da
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4783
diff
changeset
|
3383 if (verify_stacks) { |
|
2ace1c4ee8da
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tonyp
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4783
diff
changeset
|
3384 // Verify entries on the global mark stack |
|
2ace1c4ee8da
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4783
diff
changeset
|
3385 cl.set_phase(VerifyNoCSetOopsStack); |
|
2ace1c4ee8da
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diff
changeset
|
3386 _markStack.oops_do(&cl); |
|
2ace1c4ee8da
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diff
changeset
|
3387 |
|
2ace1c4ee8da
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4783
diff
changeset
|
3388 // Verify entries on the task queues |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3389 for (int i = 0; i < (int) _max_task_num; i += 1) { |
|
2ace1c4ee8da
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tonyp
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4783
diff
changeset
|
3390 cl.set_phase(VerifyNoCSetOopsQueues, i); |
|
2ace1c4ee8da
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4783
diff
changeset
|
3391 OopTaskQueue* queue = _task_queues->queue(i); |
|
2ace1c4ee8da
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4783
diff
changeset
|
3392 queue->oops_do(&cl); |
|
2ace1c4ee8da
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4783
diff
changeset
|
3393 } |
|
2ace1c4ee8da
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|
3394 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3395 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3396 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3397 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3398 // Verify entries on the enqueued SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3399 if (verify_enqueued_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3400 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3401 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3402 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3403 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3404 // Verify entries on the per-thread SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3405 if (verify_thread_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3406 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3407 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3408 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3409 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3410 if (verify_fingers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3411 // Verify the global finger |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3412 HeapWord* global_finger = finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3413 if (global_finger != NULL && global_finger < _heap_end) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3414 // The global finger always points to a heap region boundary. We |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3415 // use heap_region_containing_raw() to get the containing region |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3416 // given that the global finger could be pointing to a free region |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3417 // which subsequently becomes continues humongous. If that |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3418 // happens, heap_region_containing() will return the bottom of the |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3419 // corresponding starts humongous region and the check below will |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3420 // not hold any more. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3421 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3422 guarantee(global_finger == global_hr->bottom(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3423 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3424 global_finger, HR_FORMAT_PARAMS(global_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3425 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3426 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3427 // Verify the task fingers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3428 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3429 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3430 CMTask* task = _tasks[i]; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3431 HeapWord* task_finger = task->finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3432 if (task_finger != NULL && task_finger < _heap_end) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3433 // See above note on the global finger verification. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3434 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3435 guarantee(task_finger == task_hr->bottom() || |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3436 !task_hr->in_collection_set(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3437 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3438 task_finger, HR_FORMAT_PARAMS(task_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3439 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3440 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3441 } |
| 342 | 3442 } |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3443 #endif // PRODUCT |
| 342 | 3444 |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3445 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
| 342 | 3446 _markStack.setEmpty(); |
| 3447 _markStack.clear_overflow(); | |
| 3448 _regionStack.setEmpty(); | |
| 3449 _regionStack.clear_overflow(); | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3450 if (clear_overflow) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3451 clear_has_overflown(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3452 } else { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3453 assert(has_overflown(), "pre-condition"); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3454 } |
| 342 | 3455 _finger = _heap_start; |
| 3456 | |
| 3457 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3458 OopTaskQueue* queue = _task_queues->queue(i); | |
| 3459 queue->set_empty(); | |
|
1885
a5c514e74487
6988458: G1: assert(mr.end() <= _cm->finger()) failed: otherwise the region shouldn't be on the stack
johnc
parents:
1835
diff
changeset
|
3460 // Clear any partial regions from the CMTasks |
|
a5c514e74487
6988458: G1: assert(mr.end() <= _cm->finger()) failed: otherwise the region shouldn't be on the stack
johnc
parents:
1835
diff
changeset
|
3461 _tasks[i]->clear_aborted_region(); |
| 342 | 3462 } |
| 3463 } | |
| 3464 | |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3465 // Aggregate the counting data that was constructed concurrently |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3466 // with marking. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3467 class AggregateCountDataHRClosure: public HeapRegionClosure { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3468 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3469 BitMap* _cm_card_bm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3470 size_t _max_task_num; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3471 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3472 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3473 AggregateCountDataHRClosure(ConcurrentMark *cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3474 BitMap* cm_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3475 size_t max_task_num) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3476 _cm(cm), _cm_card_bm(cm_card_bm), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3477 _max_task_num(max_task_num) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3478 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3479 bool is_card_aligned(HeapWord* p) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3480 return ((uintptr_t(p) & (CardTableModRefBS::card_size - 1)) == 0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3481 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3482 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3483 bool doHeapRegion(HeapRegion* hr) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3484 if (hr->continuesHumongous()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3485 // We will ignore these here and process them when their |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3486 // associated "starts humongous" region is processed. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3487 // Note that we cannot rely on their associated |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3488 // "starts humongous" region to have their bit set to 1 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3489 // since, due to the region chunking in the parallel region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3490 // iteration, a "continues humongous" region might be visited |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3491 // before its associated "starts humongous". |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3492 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3493 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3494 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3495 HeapWord* start = hr->bottom(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3496 HeapWord* limit = hr->next_top_at_mark_start(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3497 HeapWord* end = hr->end(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3498 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3499 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3500 err_msg("Preconditions not met - " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3501 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3502 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3503 start, limit, hr->top(), hr->end())); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3504 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3505 assert(hr->next_marked_bytes() == 0, "Precondition"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3506 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3507 if (start == limit) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3508 // NTAMS of this region has not been set so nothing to do. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3509 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3510 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3511 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3512 assert(is_card_aligned(start), "sanity"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3513 assert(is_card_aligned(end), "sanity"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3514 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3515 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3516 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3517 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3518 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3519 // If ntams is not card aligned then we bump the index for |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3520 // limit so that we get the card spanning ntams. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3521 if (!is_card_aligned(limit)) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3522 limit_idx += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3523 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3524 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3525 assert(limit_idx <= end_idx, "or else use atomics"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3526 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3527 // Aggregate the "stripe" in the count data associated with hr. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3528 size_t hrs_index = hr->hrs_index(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3529 size_t marked_bytes = 0; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3530 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3531 for (int i = 0; (size_t)i < _max_task_num; i += 1) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3532 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3533 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3534 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3535 // Fetch the marked_bytes in this region for task i and |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3536 // add it to the running total for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3537 marked_bytes += marked_bytes_array[hrs_index]; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3538 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3539 // Now union the bitmaps[0,max_task_num)[start_idx..limit_idx) |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3540 // into the global card bitmap. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3541 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3542 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3543 while (scan_idx < limit_idx) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3544 assert(task_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3545 _cm_card_bm->set_bit(scan_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3546 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3547 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3548 // BitMap::get_next_one_offset() can handle the case when |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3549 // its left_offset parameter is greater than its right_offset |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3550 // parameter. If does, however, have an early exit if |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3551 // left_offset == right_offset. So let's limit the value |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3552 // passed in for left offset here. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3553 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3554 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3555 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3556 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3557 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3558 // Update the marked bytes for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3559 hr->add_to_marked_bytes(marked_bytes); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3560 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3561 // Now set the top at count to NTAMS. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3562 hr->set_top_at_conc_mark_count(limit); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3563 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3564 // Next heap region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3565 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3566 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3567 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3568 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3569 class G1AggregateCountDataTask: public AbstractGangTask { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3570 protected: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3571 G1CollectedHeap* _g1h; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3572 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3573 BitMap* _cm_card_bm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3574 size_t _max_task_num; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3575 int _active_workers; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3576 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3577 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3578 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3579 ConcurrentMark* cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3580 BitMap* cm_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3581 size_t max_task_num, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3582 int n_workers) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3583 AbstractGangTask("Count Aggregation"), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3584 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3585 _max_task_num(max_task_num), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3586 _active_workers(n_workers) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3587 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3588 void work(uint worker_id) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3589 AggregateCountDataHRClosure cl(_cm, _cm_card_bm, _max_task_num); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3590 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3591 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3592 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3593 _active_workers, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3594 HeapRegion::AggregateCountClaimValue); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3595 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3596 _g1h->heap_region_iterate(&cl); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3597 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3598 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3599 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3600 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3601 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3602 void ConcurrentMark::aggregate_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3603 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3604 _g1h->workers()->active_workers() : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3605 1); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3606 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3607 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3608 _max_task_num, n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3609 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3610 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3611 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3612 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3613 _g1h->set_par_threads(n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3614 _g1h->workers()->run_task(&g1_par_agg_task); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3615 _g1h->set_par_threads(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3616 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3617 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3618 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3619 _g1h->reset_heap_region_claim_values(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3620 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3621 g1_par_agg_task.work(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3622 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3623 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3624 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3625 // Clear the per-worker arrays used to store the per-region counting data |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3626 void ConcurrentMark::clear_all_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3627 // Clear the global card bitmap - it will be filled during |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3628 // liveness count aggregation (during remark) and the |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3629 // final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3630 _card_bm.clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3631 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3632 // Clear the global region bitmap - it will be filled as part |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3633 // of the final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3634 _region_bm.clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3635 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3636 size_t max_regions = _g1h->max_regions(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3637 assert(_max_task_num != 0, "unitialized"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3638 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3639 for (int i = 0; (size_t) i < _max_task_num; i += 1) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3640 BitMap* task_card_bm = count_card_bitmap_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3641 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3642 |
|
d30fa85f9994
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|
3643 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
|
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|
3644 assert(marked_bytes_array != NULL, "uninitialized"); |
|
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|
3645 |
|
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|
3646 memset(marked_bytes_array, 0, (max_regions * sizeof(size_t))); |
|
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|
3647 task_card_bm->clear(); |
|
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|
3648 } |
|
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|
3649 } |
|
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|
3650 |
| 342 | 3651 void ConcurrentMark::print_stats() { |
| 3652 if (verbose_stats()) { | |
| 3653 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3654 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3655 _tasks[i]->print_stats(); | |
| 3656 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3657 } | |
| 3658 } | |
| 3659 } | |
| 3660 | |
|
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|
3661 // Closures used by ConcurrentMark::complete_marking_in_collection_set(). |
|
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|
3662 |
|
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|
3663 class CSetMarkOopClosure: public OopClosure { |
|
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|
3664 friend class CSetMarkBitMapClosure; |
| 342 | 3665 |
| 3666 G1CollectedHeap* _g1h; | |
| 3667 CMBitMap* _bm; | |
| 3668 ConcurrentMark* _cm; | |
| 3669 oop* _ms; | |
| 3670 jint* _array_ind_stack; | |
| 3671 int _ms_size; | |
| 3672 int _ms_ind; | |
| 3673 int _array_increment; | |
|
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|
3674 uint _worker_id; |
| 342 | 3675 |
| 3676 bool push(oop obj, int arr_ind = 0) { | |
| 3677 if (_ms_ind == _ms_size) { | |
| 3678 gclog_or_tty->print_cr("Mark stack is full."); | |
| 3679 return false; | |
| 3680 } | |
| 3681 _ms[_ms_ind] = obj; | |
|
3776
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|
3682 if (obj->is_objArray()) { |
|
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|
3683 _array_ind_stack[_ms_ind] = arr_ind; |
|
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|
3684 } |
| 342 | 3685 _ms_ind++; |
| 3686 return true; | |
| 3687 } | |
| 3688 | |
| 3689 oop pop() { | |
|
3776
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|
3690 if (_ms_ind == 0) { |
|
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|
3691 return NULL; |
|
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|
3692 } else { |
| 342 | 3693 _ms_ind--; |
| 3694 return _ms[_ms_ind]; | |
| 3695 } | |
| 3696 } | |
| 3697 | |
|
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|
3698 template <class T> bool drain() { |
| 342 | 3699 while (_ms_ind > 0) { |
| 3700 oop obj = pop(); | |
| 3701 assert(obj != NULL, "Since index was non-zero."); | |
| 3702 if (obj->is_objArray()) { | |
| 3703 jint arr_ind = _array_ind_stack[_ms_ind]; | |
| 3704 objArrayOop aobj = objArrayOop(obj); | |
| 3705 jint len = aobj->length(); | |
| 3706 jint next_arr_ind = arr_ind + _array_increment; | |
| 3707 if (next_arr_ind < len) { | |
| 3708 push(obj, next_arr_ind); | |
| 3709 } | |
| 3710 // Now process this portion of this one. | |
| 3711 int lim = MIN2(next_arr_ind, len); | |
| 3712 for (int j = arr_ind; j < lim; j++) { | |
|
912
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|
3713 do_oop(aobj->objArrayOopDesc::obj_at_addr<T>(j)); |
| 342 | 3714 } |
| 3715 } else { | |
| 3716 obj->oop_iterate(this); | |
| 3717 } | |
| 3718 if (abort()) return false; | |
| 3719 } | |
| 3720 return true; | |
| 3721 } | |
| 3722 | |
| 3723 public: | |
|
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|
3724 CSetMarkOopClosure(ConcurrentMark* cm, int ms_size, uint worker_id) : |
| 342 | 3725 _g1h(G1CollectedHeap::heap()), |
| 3726 _cm(cm), | |
| 3727 _bm(cm->nextMarkBitMap()), | |
| 3728 _ms_size(ms_size), _ms_ind(0), | |
| 3729 _ms(NEW_C_HEAP_ARRAY(oop, ms_size)), | |
| 3730 _array_ind_stack(NEW_C_HEAP_ARRAY(jint, ms_size)), | |
|
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|
3731 _array_increment(MAX2(ms_size/8, 16)), |
|
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|
3732 _worker_id(worker_id) { } |
|
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|
3733 |
|
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|
3734 ~CSetMarkOopClosure() { |
| 342 | 3735 FREE_C_HEAP_ARRAY(oop, _ms); |
| 3736 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
| 3737 } | |
| 3738 | |
|
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|
3739 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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|
3740 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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|
3741 |
|
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|
3742 template <class T> void do_oop_work(T* p) { |
|
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|
3743 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
3744 if (oopDesc::is_null(heap_oop)) return; |
|
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|
3745 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 342 | 3746 if (obj->is_forwarded()) { |
| 3747 // If the object has already been forwarded, we have to make sure | |
| 3748 // that it's marked. So follow the forwarding pointer. Note that | |
| 3749 // this does the right thing for self-forwarding pointers in the | |
| 3750 // evacuation failure case. | |
| 3751 obj = obj->forwardee(); | |
| 3752 } | |
| 3753 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
| 3754 if (hr != NULL) { | |
| 3755 if (hr->in_collection_set()) { | |
| 3756 if (_g1h->is_obj_ill(obj)) { | |
|
4097
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|
3757 if (_bm->parMark((HeapWord*)obj)) { |
|
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|
3758 if (!push(obj)) { |
|
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|
3759 gclog_or_tty->print_cr("Setting abort in CSetMarkOopClosure because push failed."); |
|
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|
3760 set_abort(); |
|
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|
3761 } |
| 342 | 3762 } |
| 3763 } | |
| 3764 } else { | |
| 3765 // Outside the collection set; we need to gray it | |
| 3766 _cm->deal_with_reference(obj); | |
| 3767 } | |
| 3768 } | |
| 3769 } | |
| 3770 }; | |
| 3771 | |
|
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
3772 class CSetMarkBitMapClosure: public BitMapClosure { |
|
dc467e8b2c5e
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changeset
|
3773 G1CollectedHeap* _g1h; |
|
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|
3774 CMBitMap* _bitMap; |
|
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|
3775 ConcurrentMark* _cm; |
|
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|
3776 CSetMarkOopClosure _oop_cl; |
|
4728
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|
3777 uint _worker_id; |
|
4097
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|
3778 |
| 342 | 3779 public: |
|
4728
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|
3780 CSetMarkBitMapClosure(ConcurrentMark* cm, int ms_size, int worker_id) : |
| 342 | 3781 _g1h(G1CollectedHeap::heap()), |
| 3782 _bitMap(cm->nextMarkBitMap()), | |
|
4728
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|
3783 _oop_cl(cm, ms_size, worker_id), |
|
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changeset
|
3784 _worker_id(worker_id) { } |
| 342 | 3785 |
| 3786 bool do_bit(size_t offset) { | |
| 3787 // convert offset into a HeapWord* | |
| 3788 HeapWord* addr = _bitMap->offsetToHeapWord(offset); | |
| 3789 assert(_bitMap->endWord() && addr < _bitMap->endWord(), | |
| 3790 "address out of range"); | |
| 3791 assert(_bitMap->isMarked(addr), "tautology"); | |
| 3792 oop obj = oop(addr); | |
| 3793 if (!obj->is_forwarded()) { | |
| 3794 if (!_oop_cl.push(obj)) return false; | |
|
845
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|
3795 if (UseCompressedOops) { |
|
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diff
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|
3796 if (!_oop_cl.drain<narrowOop>()) return false; |
|
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|
3797 } else { |
|
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changeset
|
3798 if (!_oop_cl.drain<oop>()) return false; |
|
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|
3799 } |
| 342 | 3800 } |
| 3801 // Otherwise... | |
| 3802 return true; | |
| 3803 } | |
| 3804 }; | |
| 3805 | |
|
4097
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|
3806 class CompleteMarkingInCSetHRClosure: public HeapRegionClosure { |
|
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|
3807 CMBitMap* _bm; |
|
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|
3808 CSetMarkBitMapClosure _bit_cl; |
|
4728
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|
3809 uint _worker_id; |
|
4097
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|
3810 |
| 342 | 3811 enum SomePrivateConstants { |
| 3812 MSSize = 1000 | |
| 3813 }; | |
|
4097
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|
3814 |
| 342 | 3815 public: |
|
4728
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|
3816 CompleteMarkingInCSetHRClosure(ConcurrentMark* cm, int worker_id) : |
| 342 | 3817 _bm(cm->nextMarkBitMap()), |
|
4728
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|
3818 _bit_cl(cm, MSSize, worker_id), |
|
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changeset
|
3819 _worker_id(worker_id) { } |
|
4097
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|
3820 |
|
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|
3821 bool doHeapRegion(HeapRegion* hr) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
3822 if (hr->claimHeapRegion(HeapRegion::CompleteMarkCSetClaimValue)) { |
|
dc467e8b2c5e
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changeset
|
3823 // The current worker has successfully claimed the region. |
|
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|
3824 if (!hr->evacuation_failed()) { |
|
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|
3825 MemRegion mr = MemRegion(hr->bottom(), hr->next_top_at_mark_start()); |
|
dc467e8b2c5e
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|
3826 if (!mr.is_empty()) { |
|
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|
3827 bool done = false; |
|
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|
3828 while (!done) { |
|
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|
3829 done = _bm->iterate(&_bit_cl, mr); |
|
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|
3830 } |
| 342 | 3831 } |
| 3832 } | |
| 3833 } | |
| 3834 return false; | |
| 3835 } | |
| 3836 }; | |
| 3837 | |
|
4097
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|
3838 class G1ParCompleteMarkInCSetTask: public AbstractGangTask { |
|
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|
3839 protected: |
|
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|
3840 G1CollectedHeap* _g1h; |
|
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|
3841 ConcurrentMark* _cm; |
|
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|
3842 |
|
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|
3843 public: |
|
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|
3844 G1ParCompleteMarkInCSetTask(G1CollectedHeap* g1h, |
|
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|
3845 ConcurrentMark* cm) : |
|
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|
3846 AbstractGangTask("Complete Mark in CSet"), |
|
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|
3847 _g1h(g1h), _cm(cm) { } |
|
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|
3848 |
|
4728
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|
3849 void work(uint worker_id) { |
|
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|
3850 CompleteMarkingInCSetHRClosure cmplt(_cm, worker_id); |
|
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|
3851 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id); |
|
4097
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|
3852 _g1h->collection_set_iterate_from(hr, &cmplt); |
|
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|
3853 } |
|
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|
3854 }; |
|
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|
3855 |
| 342 | 3856 void ConcurrentMark::complete_marking_in_collection_set() { |
|
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|
3857 guarantee(false, "complete_marking_in_collection_set(): " |
|
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|
3858 "don't call this any more"); |
|
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|
3859 |
| 342 | 3860 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 3861 | |
| 3862 if (!g1h->mark_in_progress()) { | |
| 3863 g1h->g1_policy()->record_mark_closure_time(0.0); | |
| 3864 return; | |
| 3865 } | |
| 3866 | |
| 3867 double start = os::elapsedTime(); | |
|
4097
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|
3868 G1ParCompleteMarkInCSetTask complete_mark_task(g1h, this); |
|
dc467e8b2c5e
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|
3869 |
|
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|
3870 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
3871 |
|
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|
3872 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 4711 | 3873 int n_workers = g1h->workers()->active_workers(); |
|
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
3874 g1h->set_par_threads(n_workers); |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
3875 g1h->workers()->run_task(&complete_mark_task); |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
3876 g1h->set_par_threads(0); |
|
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|
3877 } else { |
|
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|
3878 complete_mark_task.work(0); |
| 342 | 3879 } |
|
4093
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|
3880 |
|
4097
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|
3881 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::CompleteMarkCSetClaimValue), "sanity"); |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
3882 |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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4735
diff
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|
3883 // Reset the claim values in the regions in the collection set. |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
3884 g1h->reset_cset_heap_region_claim_values(); |
|
4097
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|
3885 |
|
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|
3886 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
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|
3887 |
| 342 | 3888 double end_time = os::elapsedTime(); |
| 3889 double elapsed_time_ms = (end_time - start) * 1000.0; | |
| 3890 g1h->g1_policy()->record_mark_closure_time(elapsed_time_ms); | |
| 3891 } | |
| 3892 | |
| 3893 // The next two methods deal with the following optimisation. Some | |
| 3894 // objects are gray by being marked and located above the finger. If | |
| 3895 // they are copied, during an evacuation pause, below the finger then | |
| 3896 // the need to be pushed on the stack. The observation is that, if | |
| 3897 // there are no regions in the collection set located above the | |
| 3898 // finger, then the above cannot happen, hence we do not need to | |
| 3899 // explicitly gray any objects when copying them to below the | |
| 3900 // finger. The global stack will be scanned to ensure that, if it | |
| 3901 // points to objects being copied, it will update their | |
| 3902 // location. There is a tricky situation with the gray objects in | |
| 3903 // region stack that are being coped, however. See the comment in | |
| 3904 // newCSet(). | |
| 3905 | |
| 3906 void ConcurrentMark::newCSet() { | |
|
4787
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|
3907 guarantee(false, "newCSet(): don't call this any more"); |
|
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|
3908 |
|
3776
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|
3909 if (!concurrent_marking_in_progress()) { |
| 342 | 3910 // nothing to do if marking is not in progress |
| 3911 return; | |
|
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|
3912 } |
| 342 | 3913 |
| 3914 // find what the lowest finger is among the global and local fingers | |
| 3915 _min_finger = _finger; | |
| 3916 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3917 CMTask* task = _tasks[i]; | |
| 3918 HeapWord* task_finger = task->finger(); | |
|
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|
3919 if (task_finger != NULL && task_finger < _min_finger) { |
| 342 | 3920 _min_finger = task_finger; |
|
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|
3921 } |
| 342 | 3922 } |
| 3923 | |
| 3924 _should_gray_objects = false; | |
| 3925 | |
| 3926 // This fixes a very subtle and fustrating bug. It might be the case | |
| 3927 // that, during en evacuation pause, heap regions that contain | |
| 3928 // objects that are gray (by being in regions contained in the | |
| 3929 // region stack) are included in the collection set. Since such gray | |
| 3930 // objects will be moved, and because it's not easy to redirect | |
| 3931 // region stack entries to point to a new location (because objects | |
| 3932 // in one region might be scattered to multiple regions after they | |
| 3933 // are copied), one option is to ensure that all marked objects | |
| 3934 // copied during a pause are pushed on the stack. Notice, however, | |
| 3935 // that this problem can only happen when the region stack is not | |
| 3936 // empty during an evacuation pause. So, we make the fix a bit less | |
| 3937 // conservative and ensure that regions are pushed on the stack, | |
| 3938 // irrespective whether all collection set regions are below the | |
| 3939 // finger, if the region stack is not empty. This is expected to be | |
| 3940 // a rare case, so I don't think it's necessary to be smarted about it. | |
|
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|
3941 if (!region_stack_empty() || has_aborted_regions()) { |
| 342 | 3942 _should_gray_objects = true; |
|
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|
3943 } |
| 342 | 3944 } |
| 3945 | |
| 3946 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
|
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|
3947 guarantee(false, "registerCSetRegion(): don't call this any more"); |
|
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|
3948 |
|
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|
3949 if (!concurrent_marking_in_progress()) return; |
| 342 | 3950 |
| 3951 HeapWord* region_end = hr->end(); | |
|
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|
3952 if (region_end > _min_finger) { |
| 342 | 3953 _should_gray_objects = true; |
|
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|
3954 } |
| 342 | 3955 } |
| 3956 | |
|
3378
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|
3957 // Resets the region fields of active CMTasks whose values point |
|
69293e516993
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|
3958 // into the collection set. |
|
69293e516993
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|
3959 void ConcurrentMark::reset_active_task_region_fields_in_cset() { |
|
4787
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|
3960 guarantee(false, "reset_active_task_region_fields_in_cset(): " |
|
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|
3961 "don't call this any more"); |
|
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|
3962 |
|
3378
69293e516993
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|
3963 assert(SafepointSynchronize::is_at_safepoint(), "should be in STW"); |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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|
3964 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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|
3965 |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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diff
changeset
|
3966 for (int i = 0; i < (int)parallel_marking_threads(); i += 1) { |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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|
3967 CMTask* task = _tasks[i]; |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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|
3968 HeapWord* task_finger = task->finger(); |
|
69293e516993
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changeset
|
3969 if (task_finger != NULL) { |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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changeset
|
3970 assert(_g1h->is_in_g1_reserved(task_finger), "not in heap"); |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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changeset
|
3971 HeapRegion* finger_region = _g1h->heap_region_containing(task_finger); |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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changeset
|
3972 if (finger_region->in_collection_set()) { |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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diff
changeset
|
3973 // The task's current region is in the collection set. |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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diff
changeset
|
3974 // This region will be evacuated in the current GC and |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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|
3975 // the region fields in the task will be stale. |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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diff
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|
3976 task->giveup_current_region(); |
|
69293e516993
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|
3977 } |
|
69293e516993
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changeset
|
3978 } |
|
69293e516993
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changeset
|
3979 } |
|
69293e516993
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changeset
|
3980 } |
|
69293e516993
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changeset
|
3981 |
| 342 | 3982 // abandon current marking iteration due to a Full GC |
| 3983 void ConcurrentMark::abort() { | |
| 3984 // Clear all marks to force marking thread to do nothing | |
| 3985 _nextMarkBitMap->clearAll(); | |
|
4836
d30fa85f9994
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diff
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|
3986 // Clear the liveness counting data |
|
d30fa85f9994
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diff
changeset
|
3987 clear_all_count_data(); |
| 342 | 3988 // Empty mark stack |
| 3989 clear_marking_state(); | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
3990 for (int i = 0; i < (int)_max_task_num; ++i) { |
| 342 | 3991 _tasks[i]->clear_region_fields(); |
|
1835
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|
3992 } |
| 342 | 3993 _has_aborted = true; |
| 3994 | |
| 3995 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3996 satb_mq_set.abandon_partial_marking(); | |
|
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
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|
3997 // This can be called either during or outside marking, we'll read |
|
d4197f8d516a
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|
3998 // the expected_active value from the SATB queue set. |
|
d4197f8d516a
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|
3999 satb_mq_set.set_active_all_threads( |
|
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|
4000 false, /* new active value */ |
|
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changeset
|
4001 satb_mq_set.is_active() /* expected_active */); |
| 342 | 4002 } |
| 4003 | |
| 4004 static void print_ms_time_info(const char* prefix, const char* name, | |
| 4005 NumberSeq& ns) { | |
| 4006 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 4007 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 4008 if (ns.num() > 0) { | |
| 4009 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 4010 prefix, ns.sd(), ns.maximum()); | |
| 4011 } | |
| 4012 } | |
| 4013 | |
| 4014 void ConcurrentMark::print_summary_info() { | |
| 4015 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 4016 print_ms_time_info(" ", "init marks", _init_times); | |
| 4017 print_ms_time_info(" ", "remarks", _remark_times); | |
| 4018 { | |
| 4019 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 4020 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 4021 | |
| 4022 } | |
| 4023 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 4024 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 4025 _total_counting_time, | |
| 4026 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 4027 (double)_cleanup_times.num() | |
| 4028 : 0.0)); | |
| 4029 if (G1ScrubRemSets) { | |
| 4030 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 4031 _total_rs_scrub_time, | |
| 4032 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 4033 (double)_cleanup_times.num() | |
| 4034 : 0.0)); | |
| 4035 } | |
| 4036 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 4037 (_init_times.sum() + _remark_times.sum() + | |
| 4038 _cleanup_times.sum())/1000.0); | |
| 4039 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
|
4836
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|
4040 "(%8.2f s marking).", |
| 342 | 4041 cmThread()->vtime_accum(), |
|
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changeset
|
4042 cmThread()->vtime_mark_accum()); |
| 342 | 4043 } |
| 4044 | |
| 1019 | 4045 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
| 4046 _parallel_workers->print_worker_threads_on(st); | |
| 4047 } | |
| 4048 | |
| 342 | 4049 // We take a break if someone is trying to stop the world. |
|
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|
4050 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 342 | 4051 if (should_yield()) { |
|
4728
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|
4052 if (worker_id == 0) { |
| 342 | 4053 _g1h->g1_policy()->record_concurrent_pause(); |
|
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|
4054 } |
| 342 | 4055 cmThread()->yield(); |
|
4728
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changeset
|
4056 if (worker_id == 0) { |
| 342 | 4057 _g1h->g1_policy()->record_concurrent_pause_end(); |
|
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|
4058 } |
| 342 | 4059 return true; |
| 4060 } else { | |
| 4061 return false; | |
| 4062 } | |
| 4063 } | |
| 4064 | |
| 4065 bool ConcurrentMark::should_yield() { | |
| 4066 return cmThread()->should_yield(); | |
| 4067 } | |
| 4068 | |
| 4069 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 4070 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 4071 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 4072 } | |
| 4073 | |
| 4074 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 4075 void* last) { | |
|
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changeset
|
4076 return containing_card_is_marked(start) && |
|
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changeset
|
4077 containing_card_is_marked(last); |
| 342 | 4078 } |
| 4079 | |
| 4080 #ifndef PRODUCT | |
| 4081 // for debugging purposes | |
| 4082 void ConcurrentMark::print_finger() { | |
| 4083 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
| 4084 _heap_start, _heap_end, _finger); | |
| 4085 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 4086 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
| 4087 } | |
| 4088 gclog_or_tty->print_cr(""); | |
| 4089 } | |
| 4090 #endif | |
| 4091 | |
| 3771 | 4092 void CMTask::scan_object(oop obj) { |
| 4093 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 4094 | |
| 4095 if (_cm->verbose_high()) { | |
| 4096 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
| 4097 _task_id, (void*) obj); | |
| 4098 } | |
| 4099 | |
| 4100 size_t obj_size = obj->size(); | |
| 4101 _words_scanned += obj_size; | |
| 4102 | |
| 4103 obj->oop_iterate(_cm_oop_closure); | |
| 4104 statsOnly( ++_objs_scanned ); | |
| 4105 check_limits(); | |
| 4106 } | |
| 4107 | |
| 342 | 4108 // Closure for iteration over bitmaps |
| 4109 class CMBitMapClosure : public BitMapClosure { | |
| 4110 private: | |
| 4111 // the bitmap that is being iterated over | |
| 4112 CMBitMap* _nextMarkBitMap; | |
| 4113 ConcurrentMark* _cm; | |
| 4114 CMTask* _task; | |
| 4115 // true if we're scanning a heap region claimed by the task (so that | |
| 4116 // we move the finger along), false if we're not, i.e. currently when | |
| 4117 // scanning a heap region popped from the region stack (so that we | |
| 4118 // do not move the task finger along; it'd be a mistake if we did so). | |
| 4119 bool _scanning_heap_region; | |
| 4120 | |
| 4121 public: | |
| 4122 CMBitMapClosure(CMTask *task, | |
| 4123 ConcurrentMark* cm, | |
| 4124 CMBitMap* nextMarkBitMap) | |
| 4125 : _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } | |
| 4126 | |
| 4127 void set_scanning_heap_region(bool scanning_heap_region) { | |
| 4128 _scanning_heap_region = scanning_heap_region; | |
| 4129 } | |
| 4130 | |
| 4131 bool do_bit(size_t offset) { | |
| 4132 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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4133 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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4134 assert( addr < _cm->finger(), "invariant"); |
| 342 | 4135 |
| 4136 if (_scanning_heap_region) { | |
| 4137 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
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4138 assert(addr >= _task->finger(), "invariant"); |
| 342 | 4139 // We move that task's local finger along. |
| 4140 _task->move_finger_to(addr); | |
| 4141 } else { | |
| 4142 // We move the task's region finger along. | |
| 4143 _task->move_region_finger_to(addr); | |
| 4144 } | |
| 4145 | |
| 4146 _task->scan_object(oop(addr)); | |
| 4147 // we only partially drain the local queue and global stack | |
| 4148 _task->drain_local_queue(true); | |
| 4149 _task->drain_global_stack(true); | |
| 4150 | |
| 4151 // if the has_aborted flag has been raised, we need to bail out of | |
| 4152 // the iteration | |
| 4153 return !_task->has_aborted(); | |
| 4154 } | |
| 4155 }; | |
| 4156 | |
| 4157 // Closure for iterating over objects, currently only used for | |
| 4158 // processing SATB buffers. | |
| 4159 class CMObjectClosure : public ObjectClosure { | |
| 4160 private: | |
| 4161 CMTask* _task; | |
| 4162 | |
| 4163 public: | |
| 4164 void do_object(oop obj) { | |
| 4165 _task->deal_with_reference(obj); | |
| 4166 } | |
| 4167 | |
| 4168 CMObjectClosure(CMTask* task) : _task(task) { } | |
| 4169 }; | |
| 4170 | |
| 3771 | 4171 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 4172 ConcurrentMark* cm, | |
| 4173 CMTask* task) | |
| 4174 : _g1h(g1h), _cm(cm), _task(task) { | |
| 4175 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 4176 | |
| 4177 if (G1UseConcMarkReferenceProcessing) { | |
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4178 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 4179 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 4180 } |
| 3771 | 4181 } |
| 342 | 4182 |
| 4183 void CMTask::setup_for_region(HeapRegion* hr) { | |
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4184 // Separated the asserts so that we know which one fires. |
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4185 assert(hr != NULL, |
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4186 "claim_region() should have filtered out continues humongous regions"); |
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4187 assert(!hr->continuesHumongous(), |
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4188 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 4189 |
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4190 if (_cm->verbose_low()) { |
| 342 | 4191 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
| 4192 _task_id, hr); | |
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4193 } |
| 342 | 4194 |
| 4195 _curr_region = hr; | |
| 4196 _finger = hr->bottom(); | |
| 4197 update_region_limit(); | |
| 4198 } | |
| 4199 | |
| 4200 void CMTask::update_region_limit() { | |
| 4201 HeapRegion* hr = _curr_region; | |
| 4202 HeapWord* bottom = hr->bottom(); | |
| 4203 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 4204 | |
| 4205 if (limit == bottom) { | |
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4206 if (_cm->verbose_low()) { |
| 342 | 4207 gclog_or_tty->print_cr("[%d] found an empty region " |
| 4208 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 4209 _task_id, bottom, limit); | |
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4210 } |
| 342 | 4211 // The region was collected underneath our feet. |
| 4212 // We set the finger to bottom to ensure that the bitmap | |
| 4213 // iteration that will follow this will not do anything. | |
| 4214 // (this is not a condition that holds when we set the region up, | |
| 4215 // as the region is not supposed to be empty in the first place) | |
| 4216 _finger = bottom; | |
| 4217 } else if (limit >= _region_limit) { | |
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4218 assert(limit >= _finger, "peace of mind"); |
| 342 | 4219 } else { |
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4220 assert(limit < _region_limit, "only way to get here"); |
| 342 | 4221 // This can happen under some pretty unusual circumstances. An |
| 4222 // evacuation pause empties the region underneath our feet (NTAMS | |
| 4223 // at bottom). We then do some allocation in the region (NTAMS | |
| 4224 // stays at bottom), followed by the region being used as a GC | |
| 4225 // alloc region (NTAMS will move to top() and the objects | |
| 4226 // originally below it will be grayed). All objects now marked in | |
| 4227 // the region are explicitly grayed, if below the global finger, | |
| 4228 // and we do not need in fact to scan anything else. So, we simply | |
| 4229 // set _finger to be limit to ensure that the bitmap iteration | |
| 4230 // doesn't do anything. | |
| 4231 _finger = limit; | |
| 4232 } | |
| 4233 | |
| 4234 _region_limit = limit; | |
| 4235 } | |
| 4236 | |
| 4237 void CMTask::giveup_current_region() { | |
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4238 assert(_curr_region != NULL, "invariant"); |
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4239 if (_cm->verbose_low()) { |
| 342 | 4240 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
| 4241 _task_id, _curr_region); | |
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4242 } |
| 342 | 4243 clear_region_fields(); |
| 4244 } | |
| 4245 | |
| 4246 void CMTask::clear_region_fields() { | |
| 4247 // Values for these three fields that indicate that we're not | |
| 4248 // holding on to a region. | |
| 4249 _curr_region = NULL; | |
| 4250 _finger = NULL; | |
| 4251 _region_limit = NULL; | |
| 4252 | |
| 4253 _region_finger = NULL; | |
| 4254 } | |
| 4255 | |
| 3771 | 4256 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 4257 if (cm_oop_closure == NULL) { | |
| 4258 assert(_cm_oop_closure != NULL, "invariant"); | |
| 4259 } else { | |
| 4260 assert(_cm_oop_closure == NULL, "invariant"); | |
| 4261 } | |
| 4262 _cm_oop_closure = cm_oop_closure; | |
| 4263 } | |
| 4264 | |
| 342 | 4265 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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4266 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 4267 |
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4268 if (_cm->verbose_low()) { |
| 342 | 4269 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
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4270 } |
| 342 | 4271 |
| 4272 _nextMarkBitMap = nextMarkBitMap; | |
| 4273 clear_region_fields(); | |
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4274 assert(_aborted_region.is_empty(), "should have been cleared"); |
| 342 | 4275 |
| 4276 _calls = 0; | |
| 4277 _elapsed_time_ms = 0.0; | |
| 4278 _termination_time_ms = 0.0; | |
| 4279 _termination_start_time_ms = 0.0; | |
| 4280 | |
| 4281 #if _MARKING_STATS_ | |
| 4282 _local_pushes = 0; | |
| 4283 _local_pops = 0; | |
| 4284 _local_max_size = 0; | |
| 4285 _objs_scanned = 0; | |
| 4286 _global_pushes = 0; | |
| 4287 _global_pops = 0; | |
| 4288 _global_max_size = 0; | |
| 4289 _global_transfers_to = 0; | |
| 4290 _global_transfers_from = 0; | |
| 4291 _region_stack_pops = 0; | |
| 4292 _regions_claimed = 0; | |
| 4293 _objs_found_on_bitmap = 0; | |
| 4294 _satb_buffers_processed = 0; | |
| 4295 _steal_attempts = 0; | |
| 4296 _steals = 0; | |
| 4297 _aborted = 0; | |
| 4298 _aborted_overflow = 0; | |
| 4299 _aborted_cm_aborted = 0; | |
| 4300 _aborted_yield = 0; | |
| 4301 _aborted_timed_out = 0; | |
| 4302 _aborted_satb = 0; | |
| 4303 _aborted_termination = 0; | |
| 4304 #endif // _MARKING_STATS_ | |
| 4305 } | |
| 4306 | |
| 4307 bool CMTask::should_exit_termination() { | |
| 4308 regular_clock_call(); | |
| 4309 // This is called when we are in the termination protocol. We should | |
| 4310 // quit if, for some reason, this task wants to abort or the global | |
| 4311 // stack is not empty (this means that we can get work from it). | |
| 4312 return !_cm->mark_stack_empty() || has_aborted(); | |
| 4313 } | |
| 4314 | |
| 4315 void CMTask::reached_limit() { | |
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4316 assert(_words_scanned >= _words_scanned_limit || |
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4317 _refs_reached >= _refs_reached_limit , |
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4318 "shouldn't have been called otherwise"); |
| 342 | 4319 regular_clock_call(); |
| 4320 } | |
| 4321 | |
| 4322 void CMTask::regular_clock_call() { | |
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4323 if (has_aborted()) return; |
| 342 | 4324 |
| 4325 // First, we need to recalculate the words scanned and refs reached | |
| 4326 // limits for the next clock call. | |
| 4327 recalculate_limits(); | |
| 4328 | |
| 4329 // During the regular clock call we do the following | |
| 4330 | |
| 4331 // (1) If an overflow has been flagged, then we abort. | |
| 4332 if (_cm->has_overflown()) { | |
| 4333 set_has_aborted(); | |
| 4334 return; | |
| 4335 } | |
| 4336 | |
| 4337 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 4338 // to check anything else. The other steps are only needed during | |
| 4339 // the concurrent marking phase. | |
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4340 if (!concurrent()) return; |
| 342 | 4341 |
| 4342 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 4343 if (_cm->has_aborted()) { | |
| 4344 set_has_aborted(); | |
| 4345 statsOnly( ++_aborted_cm_aborted ); | |
| 4346 return; | |
| 4347 } | |
| 4348 | |
| 4349 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 4350 | |
| 4351 // (3) If marking stats are enabled, then we update the step history. | |
| 4352 #if _MARKING_STATS_ | |
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4353 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 4354 ++_clock_due_to_scanning; |
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4355 } |
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4356 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 4357 ++_clock_due_to_marking; |
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4358 } |
| 342 | 4359 |
| 4360 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 4361 _interval_start_time_ms = curr_time_ms; | |
| 4362 _all_clock_intervals_ms.add(last_interval_ms); | |
| 4363 | |
| 4364 if (_cm->verbose_medium()) { | |
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4365 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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4366 "scanned = %d%s, refs reached = %d%s", |
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4367 _task_id, last_interval_ms, |
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4368 _words_scanned, |
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4369 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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4370 _refs_reached, |
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4371 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 4372 } |
| 4373 #endif // _MARKING_STATS_ | |
| 4374 | |
| 4375 // (4) We check whether we should yield. If we have to, then we abort. | |
| 4376 if (_cm->should_yield()) { | |
| 4377 // We should yield. To do this we abort the task. The caller is | |
| 4378 // responsible for yielding. | |
| 4379 set_has_aborted(); | |
| 4380 statsOnly( ++_aborted_yield ); | |
| 4381 return; | |
| 4382 } | |
| 4383 | |
| 4384 // (5) We check whether we've reached our time quota. If we have, | |
| 4385 // then we abort. | |
| 4386 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 4387 if (elapsed_time_ms > _time_target_ms) { | |
| 4388 set_has_aborted(); | |
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4389 _has_timed_out = true; |
| 342 | 4390 statsOnly( ++_aborted_timed_out ); |
| 4391 return; | |
| 4392 } | |
| 4393 | |
| 4394 // (6) Finally, we check whether there are enough completed STAB | |
| 4395 // buffers available for processing. If there are, we abort. | |
| 4396 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 4397 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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4398 if (_cm->verbose_low()) { |
| 342 | 4399 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
| 4400 _task_id); | |
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4401 } |
| 342 | 4402 // we do need to process SATB buffers, we'll abort and restart |
| 4403 // the marking task to do so | |
| 4404 set_has_aborted(); | |
| 4405 statsOnly( ++_aborted_satb ); | |
| 4406 return; | |
| 4407 } | |
| 4408 } | |
| 4409 | |
| 4410 void CMTask::recalculate_limits() { | |
| 4411 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 4412 _words_scanned_limit = _real_words_scanned_limit; | |
| 4413 | |
| 4414 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 4415 _refs_reached_limit = _real_refs_reached_limit; | |
| 4416 } | |
| 4417 | |
| 4418 void CMTask::decrease_limits() { | |
| 4419 // This is called when we believe that we're going to do an infrequent | |
| 4420 // operation which will increase the per byte scanned cost (i.e. move | |
| 4421 // entries to/from the global stack). It basically tries to decrease the | |
| 4422 // scanning limit so that the clock is called earlier. | |
| 4423 | |
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4424 if (_cm->verbose_medium()) { |
| 342 | 4425 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
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4426 } |
| 342 | 4427 |
| 4428 _words_scanned_limit = _real_words_scanned_limit - | |
| 4429 3 * words_scanned_period / 4; | |
| 4430 _refs_reached_limit = _real_refs_reached_limit - | |
| 4431 3 * refs_reached_period / 4; | |
| 4432 } | |
| 4433 | |
| 4434 void CMTask::move_entries_to_global_stack() { | |
| 4435 // local array where we'll store the entries that will be popped | |
| 4436 // from the local queue | |
| 4437 oop buffer[global_stack_transfer_size]; | |
| 4438 | |
| 4439 int n = 0; | |
| 4440 oop obj; | |
| 4441 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 4442 buffer[n] = obj; | |
| 4443 ++n; | |
| 4444 } | |
| 4445 | |
| 4446 if (n > 0) { | |
| 4447 // we popped at least one entry from the local queue | |
| 4448 | |
| 4449 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 4450 | |
| 4451 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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|
4452 if (_cm->verbose_low()) { |
|
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|
4453 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
|
23d434c6290d
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|
4454 _task_id); |
|
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|
4455 } |
| 342 | 4456 set_has_aborted(); |
| 4457 } else { | |
| 4458 // the transfer was successful | |
| 4459 | |
|
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|
4460 if (_cm->verbose_medium()) { |
| 342 | 4461 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
| 4462 _task_id, n); | |
|
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|
4463 } |
| 342 | 4464 statsOnly( int tmp_size = _cm->mark_stack_size(); |
|
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|
4465 if (tmp_size > _global_max_size) { |
| 342 | 4466 _global_max_size = tmp_size; |
|
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|
4467 } |
| 342 | 4468 _global_pushes += n ); |
| 4469 } | |
| 4470 } | |
| 4471 | |
| 4472 // this operation was quite expensive, so decrease the limits | |
| 4473 decrease_limits(); | |
| 4474 } | |
| 4475 | |
| 4476 void CMTask::get_entries_from_global_stack() { | |
| 4477 // local array where we'll store the entries that will be popped | |
| 4478 // from the global stack. | |
| 4479 oop buffer[global_stack_transfer_size]; | |
| 4480 int n; | |
| 4481 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
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|
4482 assert(n <= global_stack_transfer_size, |
|
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|
4483 "we should not pop more than the given limit"); |
| 342 | 4484 if (n > 0) { |
| 4485 // yes, we did actually pop at least one entry | |
| 4486 | |
| 4487 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
|
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|
4488 if (_cm->verbose_medium()) { |
| 342 | 4489 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
| 4490 _task_id, n); | |
|
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|
4491 } |
| 342 | 4492 for (int i = 0; i < n; ++i) { |
| 4493 bool success = _task_queue->push(buffer[i]); | |
| 4494 // We only call this when the local queue is empty or under a | |
| 4495 // given target limit. So, we do not expect this push to fail. | |
|
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|
4496 assert(success, "invariant"); |
| 342 | 4497 } |
| 4498 | |
| 4499 statsOnly( int tmp_size = _task_queue->size(); | |
|
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|
4500 if (tmp_size > _local_max_size) { |
| 342 | 4501 _local_max_size = tmp_size; |
|
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|
4502 } |
| 342 | 4503 _local_pushes += n ); |
| 4504 } | |
| 4505 | |
| 4506 // this operation was quite expensive, so decrease the limits | |
| 4507 decrease_limits(); | |
| 4508 } | |
| 4509 | |
| 4510 void CMTask::drain_local_queue(bool partially) { | |
|
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|
4511 if (has_aborted()) return; |
| 342 | 4512 |
| 4513 // Decide what the target size is, depending whether we're going to | |
| 4514 // drain it partially (so that other tasks can steal if they run out | |
| 4515 // of things to do) or totally (at the very end). | |
| 4516 size_t target_size; | |
|
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|
4517 if (partially) { |
| 342 | 4518 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
|
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|
4519 } else { |
| 342 | 4520 target_size = 0; |
|
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|
4521 } |
| 342 | 4522 |
| 4523 if (_task_queue->size() > target_size) { | |
|
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|
4524 if (_cm->verbose_high()) { |
| 342 | 4525 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
| 4526 _task_id, target_size); | |
|
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|
4527 } |
| 342 | 4528 |
| 4529 oop obj; | |
| 4530 bool ret = _task_queue->pop_local(obj); | |
| 4531 while (ret) { | |
| 4532 statsOnly( ++_local_pops ); | |
| 4533 | |
|
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|
4534 if (_cm->verbose_high()) { |
| 342 | 4535 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
| 4536 (void*) obj); | |
|
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|
4537 } |
| 342 | 4538 |
|
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|
4539 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 4540 assert(!_g1h->is_on_master_free_list( |
| 2152 | 4541 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 4542 |
| 4543 scan_object(obj); | |
| 4544 | |
|
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|
4545 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 4546 ret = false; |
|
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|
4547 } else { |
| 342 | 4548 ret = _task_queue->pop_local(obj); |
|
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|
4549 } |
| 342 | 4550 } |
| 4551 | |
|
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|
4552 if (_cm->verbose_high()) { |
| 342 | 4553 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
| 4554 _task_id, _task_queue->size()); | |
|
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|
4555 } |
| 342 | 4556 } |
| 4557 } | |
| 4558 | |
| 4559 void CMTask::drain_global_stack(bool partially) { | |
|
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|
4560 if (has_aborted()) return; |
| 342 | 4561 |
| 4562 // We have a policy to drain the local queue before we attempt to | |
| 4563 // drain the global stack. | |
|
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changeset
|
4564 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 4565 |
| 4566 // Decide what the target size is, depending whether we're going to | |
| 4567 // drain it partially (so that other tasks can steal if they run out | |
| 4568 // of things to do) or totally (at the very end). Notice that, | |
| 4569 // because we move entries from the global stack in chunks or | |
| 4570 // because another task might be doing the same, we might in fact | |
| 4571 // drop below the target. But, this is not a problem. | |
| 4572 size_t target_size; | |
|
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changeset
|
4573 if (partially) { |
| 342 | 4574 target_size = _cm->partial_mark_stack_size_target(); |
|
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|
4575 } else { |
| 342 | 4576 target_size = 0; |
|
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|
4577 } |
| 342 | 4578 |
| 4579 if (_cm->mark_stack_size() > target_size) { | |
|
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changeset
|
4580 if (_cm->verbose_low()) { |
| 342 | 4581 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
| 4582 _task_id, target_size); | |
|
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|
4583 } |
| 342 | 4584 |
| 4585 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 4586 get_entries_from_global_stack(); | |
| 4587 drain_local_queue(partially); | |
| 4588 } | |
| 4589 | |
|
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|
4590 if (_cm->verbose_low()) { |
| 342 | 4591 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
| 4592 _task_id, _cm->mark_stack_size()); | |
|
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changeset
|
4593 } |
| 342 | 4594 } |
| 4595 } | |
| 4596 | |
| 4597 // SATB Queue has several assumptions on whether to call the par or | |
| 4598 // non-par versions of the methods. this is why some of the code is | |
| 4599 // replicated. We should really get rid of the single-threaded version | |
| 4600 // of the code to simplify things. | |
| 4601 void CMTask::drain_satb_buffers() { | |
|
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|
4602 if (has_aborted()) return; |
| 342 | 4603 |
| 4604 // We set this so that the regular clock knows that we're in the | |
| 4605 // middle of draining buffers and doesn't set the abort flag when it | |
| 4606 // notices that SATB buffers are available for draining. It'd be | |
| 4607 // very counter productive if it did that. :-) | |
| 4608 _draining_satb_buffers = true; | |
| 4609 | |
| 4610 CMObjectClosure oc(this); | |
| 4611 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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changeset
|
4612 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4613 satb_mq_set.set_par_closure(_task_id, &oc); |
|
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|
4614 } else { |
| 342 | 4615 satb_mq_set.set_closure(&oc); |
|
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|
4616 } |
| 342 | 4617 |
| 4618 // This keeps claiming and applying the closure to completed buffers | |
| 4619 // until we run out of buffers or we need to abort. | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1719
diff
changeset
|
4620 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4621 while (!has_aborted() && |
| 4622 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
|
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|
4623 if (_cm->verbose_medium()) { |
| 342 | 4624 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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changeset
|
4625 } |
| 342 | 4626 statsOnly( ++_satb_buffers_processed ); |
| 4627 regular_clock_call(); | |
| 4628 } | |
| 4629 } else { | |
| 4630 while (!has_aborted() && | |
| 4631 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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changeset
|
4632 if (_cm->verbose_medium()) { |
| 342 | 4633 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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changeset
|
4634 } |
| 342 | 4635 statsOnly( ++_satb_buffers_processed ); |
| 4636 regular_clock_call(); | |
| 4637 } | |
| 4638 } | |
| 4639 | |
| 4640 if (!concurrent() && !has_aborted()) { | |
| 4641 // We should only do this during remark. | |
|
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|
4642 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4643 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
|
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|
4644 } else { |
| 342 | 4645 satb_mq_set.iterate_closure_all_threads(); |
|
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|
4646 } |
| 342 | 4647 } |
| 4648 | |
| 4649 _draining_satb_buffers = false; | |
| 4650 | |
|
1023
11d4857fe5e1
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diff
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|
4651 assert(has_aborted() || |
|
11d4857fe5e1
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changeset
|
4652 concurrent() || |
|
11d4857fe5e1
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|
4653 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 4654 |
|
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|
4655 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4656 satb_mq_set.set_par_closure(_task_id, NULL); |
|
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|
4657 } else { |
| 342 | 4658 satb_mq_set.set_closure(NULL); |
|
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|
4659 } |
| 342 | 4660 |
| 4661 // again, this was a potentially expensive operation, decrease the | |
| 4662 // limits to get the regular clock call early | |
| 4663 decrease_limits(); | |
| 4664 } | |
| 4665 | |
| 4666 void CMTask::drain_region_stack(BitMapClosure* bc) { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4783
diff
changeset
|
4667 assert(_cm->region_stack_empty(), "region stack should be empty"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4783
diff
changeset
|
4668 assert(_aborted_region.is_empty(), "aborted region should be empty"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
4669 return; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4783
diff
changeset
|
4670 |
|
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|
4671 if (has_aborted()) return; |
| 342 | 4672 |
|
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11d4857fe5e1
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diff
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|
4673 assert(_region_finger == NULL, |
|
11d4857fe5e1
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1022
diff
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|
4674 "it should be NULL when we're not scanning a region"); |
| 342 | 4675 |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4676 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
|
3776
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changeset
|
4677 if (_cm->verbose_low()) { |
| 342 | 4678 gclog_or_tty->print_cr("[%d] draining region stack, size = %d", |
| 4679 _task_id, _cm->region_stack_size()); | |
|
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|
4680 } |
| 342 | 4681 |
|
1835
4805b9f4779e
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1833
diff
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|
4682 MemRegion mr; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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diff
changeset
|
4683 |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
4684 if (!_aborted_region.is_empty()) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
4685 mr = _aborted_region; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
4686 _aborted_region = MemRegion(); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
4687 |
|
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changeset
|
4688 if (_cm->verbose_low()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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changeset
|
4689 gclog_or_tty->print_cr("[%d] scanning aborted region " |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
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changeset
|
4690 "[ " PTR_FORMAT ", " PTR_FORMAT " )", |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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changeset
|
4691 _task_id, mr.start(), mr.end()); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4692 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4693 } else { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4694 mr = _cm->region_stack_pop_lock_free(); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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4695 // it returns MemRegion() if the pop fails |
|
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4696 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
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4697 } |
| 342 | 4698 |
| 4699 while (mr.start() != NULL) { | |
|
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4700 if (_cm->verbose_medium()) { |
| 342 | 4701 gclog_or_tty->print_cr("[%d] we are scanning region " |
| 4702 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 4703 _task_id, mr.start(), mr.end()); | |
|
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4704 } |
|
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4705 |
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4706 assert(mr.end() <= _cm->finger(), |
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4707 "otherwise the region shouldn't be on the stack"); |
| 342 | 4708 assert(!mr.is_empty(), "Only non-empty regions live on the region stack"); |
| 4709 if (_nextMarkBitMap->iterate(bc, mr)) { | |
|
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4710 assert(!has_aborted(), |
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4711 "cannot abort the task without aborting the bitmap iteration"); |
| 342 | 4712 |
| 4713 // We finished iterating over the region without aborting. | |
| 4714 regular_clock_call(); | |
|
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4715 if (has_aborted()) { |
| 342 | 4716 mr = MemRegion(); |
|
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4717 } else { |
|
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4718 mr = _cm->region_stack_pop_lock_free(); |
| 342 | 4719 // it returns MemRegion() if the pop fails |
| 4720 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); | |
| 4721 } | |
| 4722 } else { | |
|
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4723 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4724 |
| 4725 // The only way to abort the bitmap iteration is to return | |
| 4726 // false from the do_bit() method. However, inside the | |
| 4727 // do_bit() method we move the _region_finger to point to the | |
| 4728 // object currently being looked at. So, if we bail out, we | |
| 4729 // have definitely set _region_finger to something non-null. | |
|
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4730 assert(_region_finger != NULL, "invariant"); |
| 342 | 4731 |
|
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4732 // Make sure that any previously aborted region has been |
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4733 // cleared. |
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4734 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
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4735 |
| 342 | 4736 // The iteration was actually aborted. So now _region_finger |
| 4737 // points to the address of the object we last scanned. If we | |
| 4738 // leave it there, when we restart this task, we will rescan | |
| 4739 // the object. It is easy to avoid this. We move the finger by | |
| 4740 // enough to point to the next possible object header (the | |
| 4741 // bitmap knows by how much we need to move it as it knows its | |
| 4742 // granularity). | |
| 4743 MemRegion newRegion = | |
| 4744 MemRegion(_nextMarkBitMap->nextWord(_region_finger), mr.end()); | |
| 4745 | |
| 4746 if (!newRegion.is_empty()) { | |
| 4747 if (_cm->verbose_low()) { | |
|
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4748 gclog_or_tty->print_cr("[%d] recording unscanned region" |
|
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4749 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
| 342 | 4750 _task_id, |
| 4751 newRegion.start(), newRegion.end()); | |
| 4752 } | |
|
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4753 // Now record the part of the region we didn't scan to |
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4754 // make sure this task scans it later. |
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4755 _aborted_region = newRegion; |
| 342 | 4756 } |
| 4757 // break from while | |
| 4758 mr = MemRegion(); | |
| 4759 } | |
| 4760 _region_finger = NULL; | |
| 4761 } | |
| 4762 | |
|
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4763 if (_cm->verbose_low()) { |
| 342 | 4764 gclog_or_tty->print_cr("[%d] drained region stack, size = %d", |
| 4765 _task_id, _cm->region_stack_size()); | |
|
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4766 } |
| 342 | 4767 } |
| 4768 } | |
| 4769 | |
| 4770 void CMTask::print_stats() { | |
| 4771 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
| 4772 _task_id, _calls); | |
| 4773 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
| 4774 _elapsed_time_ms, _termination_time_ms); | |
| 4775 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4776 _step_times_ms.num(), _step_times_ms.avg(), | |
| 4777 _step_times_ms.sd()); | |
| 4778 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4779 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 4780 | |
| 4781 #if _MARKING_STATS_ | |
| 4782 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4783 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 4784 _all_clock_intervals_ms.sd()); | |
| 4785 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4786 _all_clock_intervals_ms.maximum(), | |
| 4787 _all_clock_intervals_ms.sum()); | |
| 4788 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 4789 _clock_due_to_scanning, _clock_due_to_marking); | |
| 4790 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 4791 _objs_scanned, _objs_found_on_bitmap); | |
| 4792 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 4793 _local_pushes, _local_pops, _local_max_size); | |
| 4794 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 4795 _global_pushes, _global_pops, _global_max_size); | |
| 4796 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 4797 _global_transfers_to,_global_transfers_from); | |
| 4798 gclog_or_tty->print_cr(" Regions: claimed = %d, Region Stack: pops = %d", | |
| 4799 _regions_claimed, _region_stack_pops); | |
| 4800 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); | |
| 4801 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 4802 _steal_attempts, _steals); | |
| 4803 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 4804 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 4805 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 4806 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 4807 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 4808 #endif // _MARKING_STATS_ | |
| 4809 } | |
| 4810 | |
| 4811 /***************************************************************************** | |
| 4812 | |
| 4813 The do_marking_step(time_target_ms) method is the building block | |
| 4814 of the parallel marking framework. It can be called in parallel | |
| 4815 with other invocations of do_marking_step() on different tasks | |
| 4816 (but only one per task, obviously) and concurrently with the | |
| 4817 mutator threads, or during remark, hence it eliminates the need | |
| 4818 for two versions of the code. When called during remark, it will | |
| 4819 pick up from where the task left off during the concurrent marking | |
| 4820 phase. Interestingly, tasks are also claimable during evacuation | |
| 4821 pauses too, since do_marking_step() ensures that it aborts before | |
| 4822 it needs to yield. | |
| 4823 | |
| 4824 The data structures that is uses to do marking work are the | |
| 4825 following: | |
| 4826 | |
| 4827 (1) Marking Bitmap. If there are gray objects that appear only | |
| 4828 on the bitmap (this happens either when dealing with an overflow | |
| 4829 or when the initial marking phase has simply marked the roots | |
| 4830 and didn't push them on the stack), then tasks claim heap | |
| 4831 regions whose bitmap they then scan to find gray objects. A | |
| 4832 global finger indicates where the end of the last claimed region | |
| 4833 is. A local finger indicates how far into the region a task has | |
| 4834 scanned. The two fingers are used to determine how to gray an | |
| 4835 object (i.e. whether simply marking it is OK, as it will be | |
| 4836 visited by a task in the future, or whether it needs to be also | |
| 4837 pushed on a stack). | |
| 4838 | |
| 4839 (2) Local Queue. The local queue of the task which is accessed | |
| 4840 reasonably efficiently by the task. Other tasks can steal from | |
| 4841 it when they run out of work. Throughout the marking phase, a | |
| 4842 task attempts to keep its local queue short but not totally | |
| 4843 empty, so that entries are available for stealing by other | |
| 4844 tasks. Only when there is no more work, a task will totally | |
| 4845 drain its local queue. | |
| 4846 | |
| 4847 (3) Global Mark Stack. This handles local queue overflow. During | |
| 4848 marking only sets of entries are moved between it and the local | |
| 4849 queues, as access to it requires a mutex and more fine-grain | |
| 4850 interaction with it which might cause contention. If it | |
| 4851 overflows, then the marking phase should restart and iterate | |
| 4852 over the bitmap to identify gray objects. Throughout the marking | |
| 4853 phase, tasks attempt to keep the global mark stack at a small | |
| 4854 length but not totally empty, so that entries are available for | |
| 4855 popping by other tasks. Only when there is no more work, tasks | |
| 4856 will totally drain the global mark stack. | |
| 4857 | |
| 4858 (4) Global Region Stack. Entries on it correspond to areas of | |
| 4859 the bitmap that need to be scanned since they contain gray | |
| 4860 objects. Pushes on the region stack only happen during | |
| 4861 evacuation pauses and typically correspond to areas covered by | |
| 4862 GC LABS. If it overflows, then the marking phase should restart | |
| 4863 and iterate over the bitmap to identify gray objects. Tasks will | |
| 4864 try to totally drain the region stack as soon as possible. | |
| 4865 | |
| 4866 (5) SATB Buffer Queue. This is where completed SATB buffers are | |
| 4867 made available. Buffers are regularly removed from this queue | |
| 4868 and scanned for roots, so that the queue doesn't get too | |
| 4869 long. During remark, all completed buffers are processed, as | |
| 4870 well as the filled in parts of any uncompleted buffers. | |
| 4871 | |
| 4872 The do_marking_step() method tries to abort when the time target | |
| 4873 has been reached. There are a few other cases when the | |
| 4874 do_marking_step() method also aborts: | |
| 4875 | |
| 4876 (1) When the marking phase has been aborted (after a Full GC). | |
| 4877 | |
| 4878 (2) When a global overflow (either on the global stack or the | |
| 4879 region stack) has been triggered. Before the task aborts, it | |
| 4880 will actually sync up with the other tasks to ensure that all | |
| 4881 the marking data structures (local queues, stacks, fingers etc.) | |
| 4882 are re-initialised so that when do_marking_step() completes, | |
| 4883 the marking phase can immediately restart. | |
| 4884 | |
| 4885 (3) When enough completed SATB buffers are available. The | |
| 4886 do_marking_step() method only tries to drain SATB buffers right | |
| 4887 at the beginning. So, if enough buffers are available, the | |
| 4888 marking step aborts and the SATB buffers are processed at | |
| 4889 the beginning of the next invocation. | |
| 4890 | |
| 4891 (4) To yield. when we have to yield then we abort and yield | |
| 4892 right at the end of do_marking_step(). This saves us from a lot | |
| 4893 of hassle as, by yielding we might allow a Full GC. If this | |
| 4894 happens then objects will be compacted underneath our feet, the | |
| 4895 heap might shrink, etc. We save checking for this by just | |
| 4896 aborting and doing the yield right at the end. | |
| 4897 | |
| 4898 From the above it follows that the do_marking_step() method should | |
| 4899 be called in a loop (or, otherwise, regularly) until it completes. | |
| 4900 | |
| 4901 If a marking step completes without its has_aborted() flag being | |
| 4902 true, it means it has completed the current marking phase (and | |
| 4903 also all other marking tasks have done so and have all synced up). | |
| 4904 | |
| 4905 A method called regular_clock_call() is invoked "regularly" (in | |
| 4906 sub ms intervals) throughout marking. It is this clock method that | |
| 4907 checks all the abort conditions which were mentioned above and | |
| 4908 decides when the task should abort. A work-based scheme is used to | |
| 4909 trigger this clock method: when the number of object words the | |
| 4910 marking phase has scanned or the number of references the marking | |
| 4911 phase has visited reach a given limit. Additional invocations to | |
| 4912 the method clock have been planted in a few other strategic places | |
| 4913 too. The initial reason for the clock method was to avoid calling | |
| 4914 vtime too regularly, as it is quite expensive. So, once it was in | |
| 4915 place, it was natural to piggy-back all the other conditions on it | |
| 4916 too and not constantly check them throughout the code. | |
| 4917 | |
| 4918 *****************************************************************************/ | |
| 4919 | |
|
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4920 void CMTask::do_marking_step(double time_target_ms, |
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4921 bool do_stealing, |
|
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4922 bool do_termination) { |
|
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4923 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
|
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4924 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4925 |
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4926 assert(concurrent() || _cm->region_stack_empty(), |
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4927 "the region stack should have been cleared before remark"); |
|
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4928 assert(concurrent() || !_cm->has_aborted_regions(), |
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4929 "aborted regions should have been cleared before remark"); |
|
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4930 assert(_region_finger == NULL, |
|
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4931 "this should be non-null only when a region is being scanned"); |
| 342 | 4932 |
| 4933 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
|
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4934 assert(_task_queues != NULL, "invariant"); |
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4935 assert(_task_queue != NULL, "invariant"); |
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4936 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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4937 |
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4938 assert(!_claimed, |
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4939 "only one thread should claim this task at any one time"); |
| 342 | 4940 |
| 4941 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 4942 // possible for two threads to set the _claimed flag at the same | |
| 4943 // time. But it is only for debugging purposes anyway and it will | |
| 4944 // catch most problems. | |
| 4945 _claimed = true; | |
| 4946 | |
| 4947 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4948 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 4949 | |
| 4950 double diff_prediction_ms = | |
| 4951 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 4952 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 4953 | |
| 4954 // set up the variables that are used in the work-based scheme to | |
| 4955 // call the regular clock method | |
| 4956 _words_scanned = 0; | |
| 4957 _refs_reached = 0; | |
| 4958 recalculate_limits(); | |
| 4959 | |
| 4960 // clear all flags | |
| 4961 clear_has_aborted(); | |
|
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4962 _has_timed_out = false; |
| 342 | 4963 _draining_satb_buffers = false; |
| 4964 | |
| 4965 ++_calls; | |
| 4966 | |
|
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4967 if (_cm->verbose_low()) { |
| 342 | 4968 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
| 4969 "target = %1.2lfms >>>>>>>>>>", | |
| 4970 _task_id, _calls, _time_target_ms); | |
|
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4971 } |
| 342 | 4972 |
| 4973 // Set up the bitmap and oop closures. Anything that uses them is | |
| 4974 // eventually called from this method, so it is OK to allocate these | |
| 4975 // statically. | |
| 4976 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 4977 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 4978 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 4979 |
| 4980 if (_cm->has_overflown()) { | |
| 4981 // This can happen if the region stack or the mark stack overflows | |
| 4982 // during a GC pause and this task, after a yield point, | |
| 4983 // restarts. We have to abort as we need to get into the overflow | |
| 4984 // protocol which happens right at the end of this task. | |
| 4985 set_has_aborted(); | |
| 4986 } | |
| 4987 | |
| 4988 // First drain any available SATB buffers. After this, we will not | |
| 4989 // look at SATB buffers before the next invocation of this method. | |
| 4990 // If enough completed SATB buffers are queued up, the regular clock | |
| 4991 // will abort this task so that it restarts. | |
| 4992 drain_satb_buffers(); | |
| 4993 // ...then partially drain the local queue and the global stack | |
| 4994 drain_local_queue(true); | |
| 4995 drain_global_stack(true); | |
| 4996 | |
| 4997 // Then totally drain the region stack. We will not look at | |
| 4998 // it again before the next invocation of this method. Entries on | |
| 4999 // the region stack are only added during evacuation pauses, for | |
| 5000 // which we have to yield. When we do, we abort the task anyway so | |
| 5001 // it will look at the region stack again when it restarts. | |
| 5002 bitmap_closure.set_scanning_heap_region(false); | |
| 5003 drain_region_stack(&bitmap_closure); | |
| 5004 // ...then partially drain the local queue and the global stack | |
| 5005 drain_local_queue(true); | |
| 5006 drain_global_stack(true); | |
| 5007 | |
| 5008 do { | |
| 5009 if (!has_aborted() && _curr_region != NULL) { | |
| 5010 // This means that we're already holding on to a region. | |
|
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|
5011 assert(_finger != NULL, "if region is not NULL, then the finger " |
|
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|
5012 "should not be NULL either"); |
| 342 | 5013 |
| 5014 // We might have restarted this task after an evacuation pause | |
| 5015 // which might have evacuated the region we're holding on to | |
| 5016 // underneath our feet. Let's read its limit again to make sure | |
| 5017 // that we do not iterate over a region of the heap that | |
| 5018 // contains garbage (update_region_limit() will also move | |
| 5019 // _finger to the start of the region if it is found empty). | |
| 5020 update_region_limit(); | |
| 5021 // We will start from _finger not from the start of the region, | |
| 5022 // as we might be restarting this task after aborting half-way | |
| 5023 // through scanning this region. In this case, _finger points to | |
| 5024 // the address where we last found a marked object. If this is a | |
| 5025 // fresh region, _finger points to start(). | |
| 5026 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 5027 | |
|
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|
5028 if (_cm->verbose_low()) { |
| 342 | 5029 gclog_or_tty->print_cr("[%d] we're scanning part " |
| 5030 "["PTR_FORMAT", "PTR_FORMAT") " | |
| 5031 "of region "PTR_FORMAT, | |
| 5032 _task_id, _finger, _region_limit, _curr_region); | |
|
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|
5033 } |
| 342 | 5034 |
| 5035 // Let's iterate over the bitmap of the part of the | |
| 5036 // region that is left. | |
| 5037 bitmap_closure.set_scanning_heap_region(true); | |
| 5038 if (mr.is_empty() || | |
| 5039 _nextMarkBitMap->iterate(&bitmap_closure, mr)) { | |
| 5040 // We successfully completed iterating over the region. Now, | |
| 5041 // let's give up the region. | |
| 5042 giveup_current_region(); | |
| 5043 regular_clock_call(); | |
| 5044 } else { | |
|
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|
5045 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 5046 // The only way to abort the bitmap iteration is to return |
| 5047 // false from the do_bit() method. However, inside the | |
| 5048 // do_bit() method we move the _finger to point to the | |
| 5049 // object currently being looked at. So, if we bail out, we | |
| 5050 // have definitely set _finger to something non-null. | |
|
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|
5051 assert(_finger != NULL, "invariant"); |
| 342 | 5052 |
| 5053 // Region iteration was actually aborted. So now _finger | |
| 5054 // points to the address of the object we last scanned. If we | |
| 5055 // leave it there, when we restart this task, we will rescan | |
| 5056 // the object. It is easy to avoid this. We move the finger by | |
| 5057 // enough to point to the next possible object header (the | |
| 5058 // bitmap knows by how much we need to move it as it knows its | |
| 5059 // granularity). | |
|
1314
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apetrusenko
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|
5060 assert(_finger < _region_limit, "invariant"); |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
5061 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
5062 // Check if bitmap iteration was aborted while scanning the last object |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
5063 if (new_finger >= _region_limit) { |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
5064 giveup_current_region(); |
|
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apetrusenko
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|
5065 } else { |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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|
5066 move_finger_to(new_finger); |
|
3f0549ed0c98
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apetrusenko
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|
5067 } |
| 342 | 5068 } |
| 5069 } | |
| 5070 // At this point we have either completed iterating over the | |
| 5071 // region we were holding on to, or we have aborted. | |
| 5072 | |
| 5073 // We then partially drain the local queue and the global stack. | |
| 5074 // (Do we really need this?) | |
| 5075 drain_local_queue(true); | |
| 5076 drain_global_stack(true); | |
| 5077 | |
| 5078 // Read the note on the claim_region() method on why it might | |
| 5079 // return NULL with potentially more regions available for | |
| 5080 // claiming and why we have to check out_of_regions() to determine | |
| 5081 // whether we're done or not. | |
| 5082 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 5083 // We are going to try to claim a new region. We should have | |
| 5084 // given up on the previous one. | |
|
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|
5085 // Separated the asserts so that we know which one fires. |
|
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|
5086 assert(_curr_region == NULL, "invariant"); |
|
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|
5087 assert(_finger == NULL, "invariant"); |
|
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|
5088 assert(_region_limit == NULL, "invariant"); |
|
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|
5089 if (_cm->verbose_low()) { |
| 342 | 5090 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
|
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|
5091 } |
| 342 | 5092 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
| 5093 if (claimed_region != NULL) { | |
| 5094 // Yes, we managed to claim one | |
| 5095 statsOnly( ++_regions_claimed ); | |
| 5096 | |
|
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|
5097 if (_cm->verbose_low()) { |
| 342 | 5098 gclog_or_tty->print_cr("[%d] we successfully claimed " |
| 5099 "region "PTR_FORMAT, | |
| 5100 _task_id, claimed_region); | |
|
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|
5101 } |
| 342 | 5102 |
| 5103 setup_for_region(claimed_region); | |
|
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|
5104 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 5105 } |
| 5106 // It is important to call the regular clock here. It might take | |
| 5107 // a while to claim a region if, for example, we hit a large | |
| 5108 // block of empty regions. So we need to call the regular clock | |
| 5109 // method once round the loop to make sure it's called | |
| 5110 // frequently enough. | |
| 5111 regular_clock_call(); | |
| 5112 } | |
| 5113 | |
| 5114 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
5115 assert(_cm->out_of_regions(), |
|
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|
5116 "at this point we should be out of regions"); |
| 342 | 5117 } |
| 5118 } while ( _curr_region != NULL && !has_aborted()); | |
| 5119 | |
| 5120 if (!has_aborted()) { | |
| 5121 // We cannot check whether the global stack is empty, since other | |
|
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
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|
5122 // tasks might be pushing objects to it concurrently. We also cannot |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
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diff
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|
5123 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
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|
5124 // it can push a partially done region back. |
|
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|
5125 assert(_cm->out_of_regions(), |
|
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|
5126 "at this point we should be out of regions"); |
| 342 | 5127 |
|
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|
5128 if (_cm->verbose_low()) { |
| 342 | 5129 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
|
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|
5130 } |
| 342 | 5131 |
| 5132 // Try to reduce the number of available SATB buffers so that | |
| 5133 // remark has less work to do. | |
| 5134 drain_satb_buffers(); | |
| 5135 } | |
| 5136 | |
| 5137 // Since we've done everything else, we can now totally drain the | |
| 5138 // local queue and global stack. | |
| 5139 drain_local_queue(false); | |
| 5140 drain_global_stack(false); | |
| 5141 | |
| 5142 // Attempt at work stealing from other task's queues. | |
|
2174
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2152
diff
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|
5143 if (do_stealing && !has_aborted()) { |
| 342 | 5144 // We have not aborted. This means that we have finished all that |
| 5145 // we could. Let's try to do some stealing... | |
| 5146 | |
| 5147 // We cannot check whether the global stack is empty, since other | |
|
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
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342
diff
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|
5148 // tasks might be pushing objects to it concurrently. We also cannot |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
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342
diff
changeset
|
5149 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
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diff
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|
5150 // it can push a partially done region back. |
|
1023
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|
5151 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
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|
5152 "only way to reach here"); |
| 342 | 5153 |
|
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|
5154 if (_cm->verbose_low()) { |
| 342 | 5155 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
|
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|
5156 } |
| 342 | 5157 |
| 5158 while (!has_aborted()) { | |
| 5159 oop obj; | |
| 5160 statsOnly( ++_steal_attempts ); | |
| 5161 | |
| 5162 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
|
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|
5163 if (_cm->verbose_medium()) { |
| 342 | 5164 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
| 5165 _task_id, (void*) obj); | |
|
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|
5166 } |
| 342 | 5167 |
| 5168 statsOnly( ++_steals ); | |
| 5169 | |
|
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|
5170 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
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|
5171 "any stolen object should be marked"); |
| 342 | 5172 scan_object(obj); |
| 5173 | |
| 5174 // And since we're towards the end, let's totally drain the | |
| 5175 // local queue and global stack. | |
| 5176 drain_local_queue(false); | |
| 5177 drain_global_stack(false); | |
| 5178 } else { | |
| 5179 break; | |
| 5180 } | |
| 5181 } | |
| 5182 } | |
| 5183 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
5184 // If we are about to wrap up and go into termination, check if we |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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diff
changeset
|
5185 // should raise the overflow flag. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
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|
5186 if (do_termination && !has_aborted()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
5187 if (_cm->force_overflow()->should_force()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
5188 _cm->set_has_overflown(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
5189 regular_clock_call(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
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|
5190 } |
|
cd8e33b2a8ad
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tonyp
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2436
diff
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|
5191 } |
|
cd8e33b2a8ad
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|
5192 |
| 342 | 5193 // We still haven't aborted. Now, let's try to get into the |
| 5194 // termination protocol. | |
|
2174
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|
5195 if (do_termination && !has_aborted()) { |
| 342 | 5196 // We cannot check whether the global stack is empty, since other |
|
343
afc1ce1efe66
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diff
changeset
|
5197 // tasks might be concurrently pushing objects on it. We also cannot |
|
afc1ce1efe66
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diff
changeset
|
5198 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
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|
5199 // it can push a partially done region back. |
|
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|
5200 // Separated the asserts so that we know which one fires. |
|
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|
5201 assert(_cm->out_of_regions(), "only way to reach here"); |
|
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|
5202 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 5203 |
|
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|
5204 if (_cm->verbose_low()) { |
| 342 | 5205 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
|
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|
5206 } |
| 342 | 5207 |
| 5208 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
| 5209 // The CMTask class also extends the TerminatorTerminator class, | |
| 5210 // hence its should_exit_termination() method will also decide | |
| 5211 // whether to exit the termination protocol or not. | |
| 5212 bool finished = _cm->terminator()->offer_termination(this); | |
| 5213 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
| 5214 _termination_time_ms += | |
| 5215 termination_end_time_ms - _termination_start_time_ms; | |
| 5216 | |
| 5217 if (finished) { | |
| 5218 // We're all done. | |
| 5219 | |
| 5220 if (_task_id == 0) { | |
| 5221 // let's allow task 0 to do this | |
| 5222 if (concurrent()) { | |
|
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|
5223 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 5224 // we need to set this to false before the next |
| 5225 // safepoint. This way we ensure that the marking phase | |
| 5226 // doesn't observe any more heap expansions. | |
| 5227 _cm->clear_concurrent_marking_in_progress(); | |
| 5228 } | |
| 5229 } | |
| 5230 | |
| 5231 // We can now guarantee that the global stack is empty, since | |
|
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|
5232 // all other tasks have finished. We separated the guarantees so |
|
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|
5233 // that, if a condition is false, we can immediately find out |
|
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|
5234 // which one. |
|
11d4857fe5e1
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|
5235 guarantee(_cm->out_of_regions(), "only way to reach here"); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
5236 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
|
1023
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|
5237 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
|
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|
5238 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
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|
5239 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
11d4857fe5e1
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|
5240 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
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changeset
|
5241 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
|
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|
5242 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
| 342 | 5243 |
|
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|
5244 if (_cm->verbose_low()) { |
| 342 | 5245 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
|
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|
5246 } |
| 342 | 5247 } else { |
| 5248 // Apparently there's more work to do. Let's abort this task. It | |
| 5249 // will restart it and we can hopefully find more things to do. | |
| 5250 | |
|
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|
5251 if (_cm->verbose_low()) { |
|
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|
5252 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
|
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|
5253 _task_id); |
|
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|
5254 } |
| 342 | 5255 |
| 5256 set_has_aborted(); | |
| 5257 statsOnly( ++_aborted_termination ); | |
| 5258 } | |
| 5259 } | |
| 5260 | |
| 5261 // Mainly for debugging purposes to make sure that a pointer to the | |
| 5262 // closure which was statically allocated in this frame doesn't | |
| 5263 // escape it by accident. | |
| 3771 | 5264 set_cm_oop_closure(NULL); |
| 342 | 5265 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 5266 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 5267 // Update the step history. | |
| 5268 _step_times_ms.add(elapsed_time_ms); | |
| 5269 | |
| 5270 if (has_aborted()) { | |
| 5271 // The task was aborted for some reason. | |
| 5272 | |
| 5273 statsOnly( ++_aborted ); | |
| 5274 | |
|
2174
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2152
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|
5275 if (_has_timed_out) { |
| 342 | 5276 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 5277 // Keep statistics of how well we did with respect to hitting | |
| 5278 // our target only if we actually timed out (if we aborted for | |
| 5279 // other reasons, then the results might get skewed). | |
| 5280 _marking_step_diffs_ms.add(diff_ms); | |
| 5281 } | |
| 5282 | |
| 5283 if (_cm->has_overflown()) { | |
| 5284 // This is the interesting one. We aborted because a global | |
| 5285 // overflow was raised. This means we have to restart the | |
| 5286 // marking phase and start iterating over regions. However, in | |
| 5287 // order to do this we have to make sure that all tasks stop | |
| 5288 // what they are doing and re-initialise in a safe manner. We | |
| 5289 // will achieve this with the use of two barrier sync points. | |
| 5290 | |
|
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|
5291 if (_cm->verbose_low()) { |
| 342 | 5292 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
|
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|
5293 } |
| 342 | 5294 |
| 5295 _cm->enter_first_sync_barrier(_task_id); | |
| 5296 // When we exit this sync barrier we know that all tasks have | |
| 5297 // stopped doing marking work. So, it's now safe to | |
| 5298 // re-initialise our data structures. At the end of this method, | |
| 5299 // task 0 will clear the global data structures. | |
| 5300 | |
| 5301 statsOnly( ++_aborted_overflow ); | |
| 5302 | |
| 5303 // We clear the local state of this task... | |
| 5304 clear_region_fields(); | |
| 5305 | |
| 5306 // ...and enter the second barrier. | |
| 5307 _cm->enter_second_sync_barrier(_task_id); | |
| 5308 // At this point everything has bee re-initialised and we're | |
| 5309 // ready to restart. | |
| 5310 } | |
| 5311 | |
| 5312 if (_cm->verbose_low()) { | |
| 5313 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
| 5314 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 5315 _task_id, _time_target_ms, elapsed_time_ms); | |
|
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|
5316 if (_cm->has_aborted()) { |
| 342 | 5317 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
| 5318 _task_id); | |
|
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|
5319 } |
| 342 | 5320 } |
| 5321 } else { | |
|
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|
5322 if (_cm->verbose_low()) { |
| 342 | 5323 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 5324 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 5325 _task_id, _time_target_ms, elapsed_time_ms); | |
|
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|
5326 } |
| 342 | 5327 } |
| 5328 | |
| 5329 _claimed = false; | |
| 5330 } | |
| 5331 | |
| 5332 CMTask::CMTask(int task_id, | |
| 5333 ConcurrentMark* cm, | |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
5334 size_t* marked_bytes, |
|
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|
5335 BitMap* card_bm, |
| 342 | 5336 CMTaskQueue* task_queue, |
| 5337 CMTaskQueueSet* task_queues) | |
| 5338 : _g1h(G1CollectedHeap::heap()), | |
| 5339 _task_id(task_id), _cm(cm), | |
| 5340 _claimed(false), | |
| 5341 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 5342 _task_queue(task_queue), | |
| 5343 _task_queues(task_queues), | |
| 3771 | 5344 _cm_oop_closure(NULL), |
|
4836
d30fa85f9994
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changeset
|
5345 _aborted_region(MemRegion()), |
|
d30fa85f9994
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|
5346 _marked_bytes_array(marked_bytes), |
|
d30fa85f9994
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|
5347 _card_bm(card_bm) { |
|
1023
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|
5348 guarantee(task_queue != NULL, "invariant"); |
|
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diff
changeset
|
5349 guarantee(task_queues != NULL, "invariant"); |
| 342 | 5350 |
| 5351 statsOnly( _clock_due_to_scanning = 0; | |
| 5352 _clock_due_to_marking = 0 ); | |
| 5353 | |
| 5354 _marking_step_diffs_ms.add(0.5); | |
| 5355 } | |
|
2435
371bbc844bf1
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|
5356 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5357 // These are formatting macros that are used below to ensure |
|
371bbc844bf1
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|
5358 // consistent formatting. The *_H_* versions are used to format the |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5359 // header for a particular value and they should be kept consistent |
|
371bbc844bf1
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|
5360 // with the corresponding macro. Also note that most of the macros add |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5361 // the necessary white space (as a prefix) which makes them a bit |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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|
5362 // easier to compose. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5363 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5364 // All the output lines are prefixed with this string to be able to |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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|
5365 // identify them easily in a large log file. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5366 #define G1PPRL_LINE_PREFIX "###" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5367 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
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changeset
|
5368 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
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changeset
|
5369 #ifdef _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
5370 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
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changeset
|
5371 #else // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
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changeset
|
5372 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
5373 #endif // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
5374 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5375 // For per-region info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5376 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
5377 #define G1PPRL_TYPE_H_FORMAT " %4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
5378 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
5379 #define G1PPRL_BYTE_H_FORMAT " %9s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
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|
5380 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
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|
5381 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5382 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5383 // For summary info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5384 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5385 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5386 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5387 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5388 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5389 G1PrintRegionLivenessInfoClosure:: |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5390 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5391 : _out(out), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5392 _total_used_bytes(0), _total_capacity_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5393 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
5394 _hum_used_bytes(0), _hum_capacity_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
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|
5395 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5396 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5397 MemRegion g1_committed = g1h->g1_committed(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5398 MemRegion g1_reserved = g1h->g1_reserved(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5399 double now = os::elapsedTime(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5400 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5401 // Print the header of the output. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5402 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5403 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5404 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5405 G1PPRL_SUM_ADDR_FORMAT("committed") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5406 G1PPRL_SUM_ADDR_FORMAT("reserved") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5407 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5408 g1_committed.start(), g1_committed.end(), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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|
5409 g1_reserved.start(), g1_reserved.end(), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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3979
diff
changeset
|
5410 HeapRegion::GrainBytes); |
|
2435
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|
5411 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5412 _out->print_cr(G1PPRL_LINE_PREFIX |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5413 G1PPRL_TYPE_H_FORMAT |
|
371bbc844bf1
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|
5414 G1PPRL_ADDR_BASE_H_FORMAT |
|
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|
5415 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5416 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
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|
5417 G1PPRL_BYTE_H_FORMAT |
|
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|
5418 G1PPRL_DOUBLE_H_FORMAT, |
|
371bbc844bf1
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|
5419 "type", "address-range", |
|
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|
5420 "used", "prev-live", "next-live", "gc-eff"); |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
diff
changeset
|
5421 _out->print_cr(G1PPRL_LINE_PREFIX |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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changeset
|
5422 G1PPRL_TYPE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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changeset
|
5423 G1PPRL_ADDR_BASE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
5424 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
5425 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
5426 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
5427 G1PPRL_DOUBLE_H_FORMAT, |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
5428 "", "", |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
5429 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5430 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5431 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5432 // It takes as a parameter a reference to one of the _hum_* fields, it |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5433 // deduces the corresponding value for a region in a humongous region |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5434 // series (either the region size, or what's left if the _hum_* field |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5435 // is < the region size), and updates the _hum_* field accordingly. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5436 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5437 size_t bytes = 0; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5438 // The > 0 check is to deal with the prev and next live bytes which |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5439 // could be 0. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5440 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
5441 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5442 *hum_bytes -= bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5443 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5444 return bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5445 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5446 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5447 // It deduces the values for a region in a humongous region series |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5448 // from the _hum_* fields and updates those accordingly. It assumes |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5449 // that that _hum_* fields have already been set up from the "starts |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5450 // humongous" region and we visit the regions in address order. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5451 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5452 size_t* capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5453 size_t* prev_live_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5454 size_t* next_live_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5455 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5456 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5457 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5458 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5459 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5460 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5461 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5462 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5463 const char* type = ""; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5464 HeapWord* bottom = r->bottom(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5465 HeapWord* end = r->end(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5466 size_t capacity_bytes = r->capacity(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5467 size_t used_bytes = r->used(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5468 size_t prev_live_bytes = r->live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5469 size_t next_live_bytes = r->next_live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5470 double gc_eff = r->gc_efficiency(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5471 if (r->used() == 0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5472 type = "FREE"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5473 } else if (r->is_survivor()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5474 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5475 } else if (r->is_young()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5476 type = "EDEN"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5477 } else if (r->startsHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5478 type = "HUMS"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5479 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5480 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5481 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5482 "they should have been zeroed after the last time we used them"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5483 // Set up the _hum_* fields. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5484 _hum_capacity_bytes = capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5485 _hum_used_bytes = used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5486 _hum_prev_live_bytes = prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5487 _hum_next_live_bytes = next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5488 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5489 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5490 end = bottom + HeapRegion::GrainWords; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5491 } else if (r->continuesHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5492 type = "HUMC"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5493 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5494 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5495 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5496 } else { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5497 type = "OLD"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5498 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5499 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5500 _total_used_bytes += used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5501 _total_capacity_bytes += capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5502 _total_prev_live_bytes += prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5503 _total_next_live_bytes += next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5504 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5505 // Print a line for this particular region. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5506 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5507 G1PPRL_TYPE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5508 G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5509 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5510 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5511 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5512 G1PPRL_DOUBLE_FORMAT, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5513 type, bottom, end, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5514 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5515 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5516 return false; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5517 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5518 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5519 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5520 // Print the footer of the output. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5521 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5522 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5523 " SUMMARY" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5524 G1PPRL_SUM_MB_FORMAT("capacity") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5525 G1PPRL_SUM_MB_PERC_FORMAT("used") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5526 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5527 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5528 bytes_to_mb(_total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5529 bytes_to_mb(_total_used_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5530 perc(_total_used_bytes, _total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5531 bytes_to_mb(_total_prev_live_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5532 perc(_total_prev_live_bytes, _total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5533 bytes_to_mb(_total_next_live_bytes), |
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371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
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5534 perc(_total_next_live_bytes, _total_capacity_bytes)); |
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371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
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5535 _out->cr(); |
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371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
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5536 } |