Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 4787:2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
Summary: This change simplifies the interaction between GC and concurrent marking. By disabling survivor spaces during the initial-mark pause we don't need to propagate marks of objects we copy during each GC (since we never need to copy an explicitly marked object).
Reviewed-by: johnc, brutisso
| author | tonyp |
|---|---|
| date | Tue, 10 Jan 2012 18:58:13 -0500 |
| parents | 023652e49ac0 |
| children | 2e966d967c5c |
| 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 |
| 45 // | |
| 46 // CMS Bit Map Wrapper | |
| 47 | |
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48 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
| 342 | 49 _bm((uintptr_t*)NULL,0), |
| 50 _shifter(shifter) { | |
| 51 _bmStartWord = (HeapWord*)(rs.base()); | |
| 52 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
| 53 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
| 54 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
| 55 | |
| 56 guarantee(brs.is_reserved(), "couldn't allocate CMS bit map"); | |
| 57 // For now we'll just commit all of the bit map up fromt. | |
| 58 // Later on we'll try to be more parsimonious with swap. | |
| 59 guarantee(_virtual_space.initialize(brs, brs.size()), | |
| 60 "couldn't reseve backing store for CMS bit map"); | |
| 61 assert(_virtual_space.committed_size() == brs.size(), | |
| 62 "didn't reserve backing store for all of CMS bit map?"); | |
| 63 _bm.set_map((uintptr_t*)_virtual_space.low()); | |
| 64 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
| 65 _bmWordSize, "inconsistency in bit map sizing"); | |
| 66 _bm.set_size(_bmWordSize >> _shifter); | |
| 67 } | |
| 68 | |
| 69 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
| 70 HeapWord* limit) const { | |
| 71 // First we must round addr *up* to a possible object boundary. | |
| 72 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
| 73 HeapWordSize << _shifter); | |
| 74 size_t addrOffset = heapWordToOffset(addr); | |
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75 if (limit == NULL) { |
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76 limit = _bmStartWord + _bmWordSize; |
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77 } |
| 342 | 78 size_t limitOffset = heapWordToOffset(limit); |
| 79 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
| 80 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 81 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 82 assert(nextAddr == limit || isMarked(nextAddr), | |
| 83 "get_next_one postcondition"); | |
| 84 return nextAddr; | |
| 85 } | |
| 86 | |
| 87 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
| 88 HeapWord* limit) const { | |
| 89 size_t addrOffset = heapWordToOffset(addr); | |
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90 if (limit == NULL) { |
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91 limit = _bmStartWord + _bmWordSize; |
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92 } |
| 342 | 93 size_t limitOffset = heapWordToOffset(limit); |
| 94 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
| 95 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 96 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 97 assert(nextAddr == limit || !isMarked(nextAddr), | |
| 98 "get_next_one postcondition"); | |
| 99 return nextAddr; | |
| 100 } | |
| 101 | |
| 102 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
| 103 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
| 104 return (int) (diff >> _shifter); | |
| 105 } | |
| 106 | |
| 107 bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) { | |
| 108 HeapWord* left = MAX2(_bmStartWord, mr.start()); | |
| 109 HeapWord* right = MIN2(_bmStartWord + _bmWordSize, mr.end()); | |
| 110 if (right > left) { | |
| 111 // Right-open interval [leftOffset, rightOffset). | |
| 112 return _bm.iterate(cl, heapWordToOffset(left), heapWordToOffset(right)); | |
| 113 } else { | |
| 114 return true; | |
| 115 } | |
| 116 } | |
| 117 | |
| 118 void CMBitMapRO::mostly_disjoint_range_union(BitMap* from_bitmap, | |
| 119 size_t from_start_index, | |
| 120 HeapWord* to_start_word, | |
| 121 size_t word_num) { | |
| 122 _bm.mostly_disjoint_range_union(from_bitmap, | |
| 123 from_start_index, | |
| 124 heapWordToOffset(to_start_word), | |
| 125 word_num); | |
| 126 } | |
| 127 | |
| 128 #ifndef PRODUCT | |
| 129 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
| 130 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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131 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
| 342 | 132 "size inconsistency"); |
| 133 return _bmStartWord == (HeapWord*)(rs.base()) && | |
| 134 _bmWordSize == rs.size()>>LogHeapWordSize; | |
| 135 } | |
| 136 #endif | |
| 137 | |
| 138 void CMBitMap::clearAll() { | |
| 139 _bm.clear(); | |
| 140 return; | |
| 141 } | |
| 142 | |
| 143 void CMBitMap::markRange(MemRegion mr) { | |
| 144 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 145 assert(!mr.is_empty(), "unexpected empty region"); | |
| 146 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 147 ((HeapWord *) mr.end())), | |
| 148 "markRange memory region end is not card aligned"); | |
| 149 // convert address range into offset range | |
| 150 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 151 heapWordToOffset(mr.end()), true); | |
| 152 } | |
| 153 | |
| 154 void CMBitMap::clearRange(MemRegion mr) { | |
| 155 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 156 assert(!mr.is_empty(), "unexpected empty region"); | |
| 157 // convert address range into offset range | |
| 158 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 159 heapWordToOffset(mr.end()), false); | |
| 160 } | |
| 161 | |
| 162 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 163 HeapWord* end_addr) { | |
| 164 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 165 start = MIN2(start, end_addr); | |
| 166 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 167 end = MIN2(end, end_addr); | |
| 168 assert(start <= end, "Consistency check"); | |
| 169 MemRegion mr(start, end); | |
| 170 if (!mr.is_empty()) { | |
| 171 clearRange(mr); | |
| 172 } | |
| 173 return mr; | |
| 174 } | |
| 175 | |
| 176 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 177 _base(NULL), _cm(cm) | |
| 178 #ifdef ASSERT | |
| 179 , _drain_in_progress(false) | |
| 180 , _drain_in_progress_yields(false) | |
| 181 #endif | |
| 182 {} | |
| 183 | |
| 184 void CMMarkStack::allocate(size_t size) { | |
| 185 _base = NEW_C_HEAP_ARRAY(oop, size); | |
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186 if (_base == NULL) { |
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187 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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188 } |
| 342 | 189 _index = 0; |
| 190 _capacity = (jint) size; | |
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191 _saved_index = -1; |
| 342 | 192 NOT_PRODUCT(_max_depth = 0); |
| 193 } | |
| 194 | |
| 195 CMMarkStack::~CMMarkStack() { | |
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196 if (_base != NULL) { |
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197 FREE_C_HEAP_ARRAY(oop, _base); |
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198 } |
| 342 | 199 } |
| 200 | |
| 201 void CMMarkStack::par_push(oop ptr) { | |
| 202 while (true) { | |
| 203 if (isFull()) { | |
| 204 _overflow = true; | |
| 205 return; | |
| 206 } | |
| 207 // Otherwise... | |
| 208 jint index = _index; | |
| 209 jint next_index = index+1; | |
| 210 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 211 if (res == index) { | |
| 212 _base[index] = ptr; | |
| 213 // Note that we don't maintain this atomically. We could, but it | |
| 214 // doesn't seem necessary. | |
| 215 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 216 return; | |
| 217 } | |
| 218 // Otherwise, we need to try again. | |
| 219 } | |
| 220 } | |
| 221 | |
| 222 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 223 while (true) { | |
| 224 if (isFull()) { | |
| 225 _overflow = true; | |
| 226 return; | |
| 227 } | |
| 228 // Otherwise... | |
| 229 jint index = _index; | |
| 230 jint next_index = index + n; | |
| 231 if (next_index > _capacity) { | |
| 232 _overflow = true; | |
| 233 return; | |
| 234 } | |
| 235 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 236 if (res == index) { | |
| 237 for (int i = 0; i < n; i++) { | |
| 238 int ind = index + i; | |
| 239 assert(ind < _capacity, "By overflow test above."); | |
| 240 _base[ind] = ptr_arr[i]; | |
| 241 } | |
| 242 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 243 return; | |
| 244 } | |
| 245 // Otherwise, we need to try again. | |
| 246 } | |
| 247 } | |
| 248 | |
| 249 | |
| 250 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 251 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 252 jint start = _index; | |
| 253 jint next_index = start + n; | |
| 254 if (next_index > _capacity) { | |
| 255 _overflow = true; | |
| 256 return; | |
| 257 } | |
| 258 // Otherwise. | |
| 259 _index = next_index; | |
| 260 for (int i = 0; i < n; i++) { | |
| 261 int ind = start + i; | |
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262 assert(ind < _capacity, "By overflow test above."); |
| 342 | 263 _base[ind] = ptr_arr[i]; |
| 264 } | |
| 265 } | |
| 266 | |
| 267 | |
| 268 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 269 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 270 jint index = _index; | |
| 271 if (index == 0) { | |
| 272 *n = 0; | |
| 273 return false; | |
| 274 } else { | |
| 275 int k = MIN2(max, index); | |
| 276 jint new_ind = index - k; | |
| 277 for (int j = 0; j < k; j++) { | |
| 278 ptr_arr[j] = _base[new_ind + j]; | |
| 279 } | |
| 280 _index = new_ind; | |
| 281 *n = k; | |
| 282 return true; | |
| 283 } | |
| 284 } | |
| 285 | |
| 286 CMRegionStack::CMRegionStack() : _base(NULL) {} | |
| 287 | |
| 288 void CMRegionStack::allocate(size_t size) { | |
| 289 _base = NEW_C_HEAP_ARRAY(MemRegion, size); | |
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290 if (_base == NULL) { |
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291 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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292 } |
| 342 | 293 _index = 0; |
| 294 _capacity = (jint) size; | |
| 295 } | |
| 296 | |
| 297 CMRegionStack::~CMRegionStack() { | |
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298 if (_base != NULL) { |
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299 FREE_C_HEAP_ARRAY(oop, _base); |
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300 } |
| 342 | 301 } |
| 302 | |
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303 void CMRegionStack::push_lock_free(MemRegion mr) { |
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304 guarantee(false, "push_lock_free(): don't call this any more"); |
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305 |
| 342 | 306 assert(mr.word_size() > 0, "Precondition"); |
| 307 while (true) { | |
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308 jint index = _index; |
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309 |
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310 if (index >= _capacity) { |
| 342 | 311 _overflow = true; |
| 312 return; | |
| 313 } | |
| 314 // Otherwise... | |
| 315 jint next_index = index+1; | |
| 316 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 317 if (res == index) { | |
| 318 _base[index] = mr; | |
| 319 return; | |
| 320 } | |
| 321 // Otherwise, we need to try again. | |
| 322 } | |
| 323 } | |
| 324 | |
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325 // Lock-free pop of the region stack. Called during the concurrent |
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326 // marking / remark phases. Should only be called in tandem with |
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327 // other lock-free pops. |
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328 MemRegion CMRegionStack::pop_lock_free() { |
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329 guarantee(false, "pop_lock_free(): don't call this any more"); |
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330 |
| 342 | 331 while (true) { |
| 332 jint index = _index; | |
| 333 | |
| 334 if (index == 0) { | |
| 335 return MemRegion(); | |
| 336 } | |
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337 // Otherwise... |
| 342 | 338 jint next_index = index-1; |
| 339 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 340 if (res == index) { | |
| 341 MemRegion mr = _base[next_index]; | |
| 342 if (mr.start() != NULL) { | |
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343 assert(mr.end() != NULL, "invariant"); |
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344 assert(mr.word_size() > 0, "invariant"); |
| 342 | 345 return mr; |
| 346 } else { | |
| 347 // that entry was invalidated... let's skip it | |
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348 assert(mr.end() == NULL, "invariant"); |
| 342 | 349 } |
| 350 } | |
| 351 // Otherwise, we need to try again. | |
| 352 } | |
| 353 } | |
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354 |
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355 #if 0 |
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356 // The routines that manipulate the region stack with a lock are |
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357 // not currently used. They should be retained, however, as a |
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358 // diagnostic aid. |
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359 |
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360 void CMRegionStack::push_with_lock(MemRegion mr) { |
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361 assert(mr.word_size() > 0, "Precondition"); |
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362 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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363 |
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364 if (isFull()) { |
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365 _overflow = true; |
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366 return; |
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367 } |
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368 |
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369 _base[_index] = mr; |
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370 _index += 1; |
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371 } |
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372 |
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373 MemRegion CMRegionStack::pop_with_lock() { |
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374 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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375 |
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376 while (true) { |
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377 if (_index == 0) { |
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378 return MemRegion(); |
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379 } |
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380 _index -= 1; |
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381 |
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382 MemRegion mr = _base[_index]; |
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383 if (mr.start() != NULL) { |
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384 assert(mr.end() != NULL, "invariant"); |
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385 assert(mr.word_size() > 0, "invariant"); |
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386 return mr; |
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387 } else { |
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388 // that entry was invalidated... let's skip it |
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389 assert(mr.end() == NULL, "invariant"); |
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390 } |
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391 } |
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392 } |
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393 #endif |
| 342 | 394 |
| 395 bool CMRegionStack::invalidate_entries_into_cset() { | |
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396 guarantee(false, "invalidate_entries_into_cset(): don't call this any more"); |
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397 |
| 342 | 398 bool result = false; |
| 399 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 400 for (int i = 0; i < _oops_do_bound; ++i) { | |
| 401 MemRegion mr = _base[i]; | |
| 402 if (mr.start() != NULL) { | |
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403 assert(mr.end() != NULL, "invariant"); |
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404 assert(mr.word_size() > 0, "invariant"); |
| 342 | 405 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
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406 assert(hr != NULL, "invariant"); |
| 342 | 407 if (hr->in_collection_set()) { |
| 408 // The region points into the collection set | |
| 409 _base[i] = MemRegion(); | |
| 410 result = true; | |
| 411 } | |
| 412 } else { | |
| 413 // that entry was invalidated... let's skip it | |
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414 assert(mr.end() == NULL, "invariant"); |
| 342 | 415 } |
| 416 } | |
| 417 return result; | |
| 418 } | |
| 419 | |
| 420 template<class OopClosureClass> | |
| 421 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 422 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 423 || SafepointSynchronize::is_at_safepoint(), | |
| 424 "Drain recursion must be yield-safe."); | |
| 425 bool res = true; | |
| 426 debug_only(_drain_in_progress = true); | |
| 427 debug_only(_drain_in_progress_yields = yield_after); | |
| 428 while (!isEmpty()) { | |
| 429 oop newOop = pop(); | |
| 430 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 431 assert(newOop->is_oop(), "Expected an oop"); | |
| 432 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 433 "only grey objects on this stack"); | |
| 434 // iterate over the oops in this oop, marking and pushing | |
| 435 // the ones in CMS generation. | |
| 436 newOop->oop_iterate(cl); | |
| 437 if (yield_after && _cm->do_yield_check()) { | |
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438 res = false; |
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439 break; |
| 342 | 440 } |
| 441 } | |
| 442 debug_only(_drain_in_progress = false); | |
| 443 return res; | |
| 444 } | |
| 445 | |
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446 void CMMarkStack::note_start_of_gc() { |
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447 assert(_saved_index == -1, |
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448 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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449 _saved_index = _index; |
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450 } |
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451 |
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452 void CMMarkStack::note_end_of_gc() { |
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453 // This is intentionally a guarantee, instead of an assert. If we |
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454 // accidentally add something to the mark stack during GC, it |
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455 // will be a correctness issue so it's better if we crash. we'll |
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456 // only check this once per GC anyway, so it won't be a performance |
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457 // issue in any way. |
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458 guarantee(_saved_index == _index, |
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459 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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460 _saved_index = -1; |
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461 } |
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462 |
| 342 | 463 void CMMarkStack::oops_do(OopClosure* f) { |
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464 assert(_saved_index == _index, |
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465 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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466 for (int i = 0; i < _index; i += 1) { |
| 342 | 467 f->do_oop(&_base[i]); |
| 468 } | |
| 469 } | |
| 470 | |
| 471 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
| 472 return (_g1h->is_obj_ill(obj) | |
| 473 || (_g1h->is_in_permanent(obj) | |
| 474 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
| 475 } | |
| 476 | |
| 477 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 478 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 479 #endif // _MSC_VER | |
| 480 | |
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481 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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482 return MAX2((n_par_threads + 2) / 4, 1U); |
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483 } |
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484 |
| 342 | 485 ConcurrentMark::ConcurrentMark(ReservedSpace rs, |
| 486 int max_regions) : | |
| 487 _markBitMap1(rs, MinObjAlignment - 1), | |
| 488 _markBitMap2(rs, MinObjAlignment - 1), | |
| 489 | |
| 490 _parallel_marking_threads(0), | |
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491 _max_parallel_marking_threads(0), |
| 342 | 492 _sleep_factor(0.0), |
| 493 _marking_task_overhead(1.0), | |
| 494 _cleanup_sleep_factor(0.0), | |
| 495 _cleanup_task_overhead(1.0), | |
| 2152 | 496 _cleanup_list("Cleanup List"), |
| 342 | 497 _region_bm(max_regions, false /* in_resource_area*/), |
| 498 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
| 499 CardTableModRefBS::card_shift, | |
| 500 false /* in_resource_area*/), | |
| 501 _prevMarkBitMap(&_markBitMap1), | |
| 502 _nextMarkBitMap(&_markBitMap2), | |
| 503 _at_least_one_mark_complete(false), | |
| 504 | |
| 505 _markStack(this), | |
| 506 _regionStack(), | |
| 507 // _finger set in set_non_marking_state | |
| 508 | |
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509 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 510 // _active_tasks set in set_non_marking_state |
| 511 // _tasks set inside the constructor | |
| 512 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
| 513 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
| 514 | |
| 515 _has_overflown(false), | |
| 516 _concurrent(false), | |
|
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517 _has_aborted(false), |
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518 _restart_for_overflow(false), |
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519 _concurrent_marking_in_progress(false), |
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520 _should_gray_objects(false), |
| 342 | 521 |
| 522 // _verbose_level set below | |
| 523 | |
| 524 _init_times(), | |
| 525 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 526 _cleanup_times(), | |
| 527 _total_counting_time(0.0), | |
| 528 _total_rs_scrub_time(0.0), | |
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529 _parallel_workers(NULL) { |
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530 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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531 if (verbose_level < no_verbose) { |
| 342 | 532 verbose_level = no_verbose; |
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533 } |
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534 if (verbose_level > high_verbose) { |
| 342 | 535 verbose_level = high_verbose; |
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536 } |
| 342 | 537 _verbose_level = verbose_level; |
| 538 | |
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539 if (verbose_low()) { |
| 342 | 540 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
| 541 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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542 } |
| 342 | 543 |
| 1284 | 544 _markStack.allocate(MarkStackSize); |
| 751 | 545 _regionStack.allocate(G1MarkRegionStackSize); |
| 342 | 546 |
| 547 // Create & start a ConcurrentMark thread. | |
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548 _cmThread = new ConcurrentMarkThread(this); |
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549 assert(cmThread() != NULL, "CM Thread should have been created"); |
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550 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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551 |
| 342 | 552 _g1h = G1CollectedHeap::heap(); |
| 553 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
| 554 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
| 555 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
| 556 | |
| 557 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 558 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 559 |
| 560 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
| 561 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
| 562 | |
| 563 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail | |
| 564 _active_tasks = _max_task_num; | |
| 565 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 566 CMTaskQueue* task_queue = new CMTaskQueue(); | |
| 567 task_queue->initialize(); | |
| 568 _task_queues->register_queue(i, task_queue); | |
| 569 | |
| 570 _tasks[i] = new CMTask(i, this, task_queue, _task_queues); | |
| 571 _accum_task_vtime[i] = 0.0; | |
| 572 } | |
| 573 | |
| 1284 | 574 if (ConcGCThreads > ParallelGCThreads) { |
| 575 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
| 342 | 576 "than ParallelGCThreads."); |
| 577 } | |
| 578 if (ParallelGCThreads == 0) { | |
| 579 // if we are not running with any parallel GC threads we will not | |
| 580 // spawn any marking threads either | |
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581 _parallel_marking_threads = 0; |
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582 _max_parallel_marking_threads = 0; |
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583 _sleep_factor = 0.0; |
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584 _marking_task_overhead = 1.0; |
| 342 | 585 } else { |
| 1284 | 586 if (ConcGCThreads > 0) { |
| 587 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
| 342 | 588 // if both are set |
| 589 | |
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590 _parallel_marking_threads = (uint) ConcGCThreads; |
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591 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 592 _sleep_factor = 0.0; |
| 593 _marking_task_overhead = 1.0; | |
| 751 | 594 } else if (G1MarkingOverheadPercent > 0) { |
| 342 | 595 // we will calculate the number of parallel marking threads |
| 596 // based on a target overhead with respect to the soft real-time | |
| 597 // goal | |
| 598 | |
| 751 | 599 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 600 double overall_cm_overhead = |
| 751 | 601 (double) MaxGCPauseMillis * marking_overhead / |
| 602 (double) GCPauseIntervalMillis; | |
| 342 | 603 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 604 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 605 double marking_task_overhead = | |
| 606 overall_cm_overhead / marking_thread_num * | |
| 607 (double) os::processor_count(); | |
| 608 double sleep_factor = | |
| 609 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 610 | |
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611 _parallel_marking_threads = (uint) marking_thread_num; |
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612 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 613 _sleep_factor = sleep_factor; |
| 614 _marking_task_overhead = marking_task_overhead; | |
| 615 } else { | |
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616 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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617 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 618 _sleep_factor = 0.0; |
| 619 _marking_task_overhead = 1.0; | |
| 620 } | |
| 621 | |
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622 if (parallel_marking_threads() > 1) { |
| 342 | 623 _cleanup_task_overhead = 1.0; |
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624 } else { |
| 342 | 625 _cleanup_task_overhead = marking_task_overhead(); |
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626 } |
| 342 | 627 _cleanup_sleep_factor = |
| 628 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 629 | |
| 630 #if 0 | |
| 631 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 632 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 633 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 634 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 635 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 636 #endif | |
| 637 | |
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638 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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639 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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640 _max_parallel_marking_threads, false, true); |
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641 if (_parallel_workers == NULL) { |
| 342 | 642 vm_exit_during_initialization("Failed necessary allocation."); |
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643 } else { |
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644 _parallel_workers->initialize_workers(); |
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645 } |
| 342 | 646 } |
| 647 | |
| 648 // so that the call below can read a sensible value | |
| 649 _heap_start = (HeapWord*) rs.base(); | |
| 650 set_non_marking_state(); | |
| 651 } | |
| 652 | |
| 653 void ConcurrentMark::update_g1_committed(bool force) { | |
| 654 // If concurrent marking is not in progress, then we do not need to | |
| 655 // update _heap_end. This has a subtle and important | |
| 656 // side-effect. Imagine that two evacuation pauses happen between | |
| 657 // marking completion and remark. The first one can grow the | |
| 658 // heap (hence now the finger is below the heap end). Then, the | |
| 659 // second one could unnecessarily push regions on the region | |
| 660 // stack. This causes the invariant that the region stack is empty | |
| 661 // at the beginning of remark to be false. By ensuring that we do | |
| 662 // not observe heap expansions after marking is complete, then we do | |
| 663 // not have this problem. | |
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664 if (!concurrent_marking_in_progress() && !force) return; |
| 342 | 665 |
| 666 MemRegion committed = _g1h->g1_committed(); | |
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667 assert(committed.start() == _heap_start, "start shouldn't change"); |
| 342 | 668 HeapWord* new_end = committed.end(); |
| 669 if (new_end > _heap_end) { | |
| 670 // The heap has been expanded. | |
| 671 | |
| 672 _heap_end = new_end; | |
| 673 } | |
| 674 // Notice that the heap can also shrink. However, this only happens | |
| 675 // during a Full GC (at least currently) and the entire marking | |
| 676 // phase will bail out and the task will not be restarted. So, let's | |
| 677 // do nothing. | |
| 678 } | |
| 679 | |
| 680 void ConcurrentMark::reset() { | |
| 681 // Starting values for these two. This should be called in a STW | |
| 682 // phase. CM will be notified of any future g1_committed expansions | |
| 683 // will be at the end of evacuation pauses, when tasks are | |
| 684 // inactive. | |
| 685 MemRegion committed = _g1h->g1_committed(); | |
| 686 _heap_start = committed.start(); | |
| 687 _heap_end = committed.end(); | |
| 688 | |
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689 // Separated the asserts so that we know which one fires. |
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690 assert(_heap_start != NULL, "heap bounds should look ok"); |
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691 assert(_heap_end != NULL, "heap bounds should look ok"); |
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692 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 693 |
| 694 // reset all the marking data structures and any necessary flags | |
| 695 clear_marking_state(); | |
| 696 | |
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697 if (verbose_low()) { |
| 342 | 698 gclog_or_tty->print_cr("[global] resetting"); |
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699 } |
| 342 | 700 |
| 701 // We do reset all of them, since different phases will use | |
| 702 // different number of active threads. So, it's easiest to have all | |
| 703 // of them ready. | |
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704 for (int i = 0; i < (int) _max_task_num; ++i) { |
| 342 | 705 _tasks[i]->reset(_nextMarkBitMap); |
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706 } |
| 342 | 707 |
| 708 // we need this to make sure that the flag is on during the evac | |
| 709 // pause with initial mark piggy-backed | |
| 710 set_concurrent_marking_in_progress(); | |
| 711 } | |
| 712 | |
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713 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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714 assert(active_tasks <= _max_task_num, "we should not have more"); |
| 342 | 715 |
| 716 _active_tasks = active_tasks; | |
| 717 // Need to update the three data structures below according to the | |
| 718 // number of active threads for this phase. | |
| 719 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 720 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 721 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 722 | |
| 723 _concurrent = concurrent; | |
| 724 // We propagate this to all tasks, not just the active ones. | |
| 725 for (int i = 0; i < (int) _max_task_num; ++i) | |
| 726 _tasks[i]->set_concurrent(concurrent); | |
| 727 | |
| 728 if (concurrent) { | |
| 729 set_concurrent_marking_in_progress(); | |
| 730 } else { | |
| 731 // We currently assume that the concurrent flag has been set to | |
| 732 // false before we start remark. At this point we should also be | |
| 733 // in a STW phase. | |
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734 assert(!concurrent_marking_in_progress(), "invariant"); |
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735 assert(_finger == _heap_end, "only way to get here"); |
| 342 | 736 update_g1_committed(true); |
| 737 } | |
| 738 } | |
| 739 | |
| 740 void ConcurrentMark::set_non_marking_state() { | |
| 741 // We set the global marking state to some default values when we're | |
| 742 // not doing marking. | |
| 743 clear_marking_state(); | |
| 744 _active_tasks = 0; | |
| 745 clear_concurrent_marking_in_progress(); | |
| 746 } | |
| 747 | |
| 748 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 749 // The ConcurrentMark instance is never freed. |
| 750 ShouldNotReachHere(); | |
| 342 | 751 } |
| 752 | |
| 753 // This closure is used to mark refs into the g1 generation | |
| 754 // from external roots in the CMS bit map. | |
| 755 // Called at the first checkpoint. | |
| 756 // | |
| 757 | |
| 758 void ConcurrentMark::clearNextBitmap() { | |
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759 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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760 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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761 |
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762 // Make sure that the concurrent mark thread looks to still be in |
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763 // the current cycle. |
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764 guarantee(cmThread()->during_cycle(), "invariant"); |
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765 |
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766 // We are finishing up the current cycle by clearing the next |
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767 // marking bitmap and getting it ready for the next cycle. During |
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768 // this time no other cycle can start. So, let's make sure that this |
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769 // is the case. |
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770 guarantee(!g1h->mark_in_progress(), "invariant"); |
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771 |
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772 // clear the mark bitmap (no grey objects to start with). |
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773 // We need to do this in chunks and offer to yield in between |
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774 // each chunk. |
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775 HeapWord* start = _nextMarkBitMap->startWord(); |
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776 HeapWord* end = _nextMarkBitMap->endWord(); |
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777 HeapWord* cur = start; |
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778 size_t chunkSize = M; |
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779 while (cur < end) { |
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780 HeapWord* next = cur + chunkSize; |
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781 if (next > end) { |
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782 next = end; |
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783 } |
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784 MemRegion mr(cur,next); |
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785 _nextMarkBitMap->clearRange(mr); |
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786 cur = next; |
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787 do_yield_check(); |
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788 |
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789 // Repeat the asserts from above. We'll do them as asserts here to |
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790 // minimize their overhead on the product. However, we'll have |
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791 // them as guarantees at the beginning / end of the bitmap |
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792 // clearing to get some checking in the product. |
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793 assert(cmThread()->during_cycle(), "invariant"); |
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794 assert(!g1h->mark_in_progress(), "invariant"); |
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795 } |
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796 |
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797 // Repeat the asserts from above. |
|
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798 guarantee(cmThread()->during_cycle(), "invariant"); |
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799 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 800 } |
| 801 | |
| 802 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
| 803 public: | |
| 804 bool doHeapRegion(HeapRegion* r) { | |
| 805 if (!r->continuesHumongous()) { | |
|
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806 r->note_start_of_marking(); |
| 342 | 807 } |
| 808 return false; | |
| 809 } | |
| 810 }; | |
| 811 | |
| 812 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 813 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 814 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 815 | |
| 816 _has_aborted = false; | |
| 817 | |
|
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818 #ifndef PRODUCT |
| 1044 | 819 if (G1PrintReachableAtInitialMark) { |
| 1388 | 820 print_reachable("at-cycle-start", |
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821 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 822 } |
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823 #endif |
| 342 | 824 |
| 825 // Initialise marking structures. This has to be done in a STW phase. | |
| 826 reset(); | |
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827 |
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828 // For each region note start of marking. |
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829 NoteStartOfMarkHRClosure startcl; |
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830 g1h->heap_region_iterate(&startcl); |
| 342 | 831 } |
| 832 | |
| 833 | |
| 834 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 835 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 836 | |
|
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837 // If we force an overflow during remark, the remark operation will |
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838 // actually abort and we'll restart concurrent marking. If we always |
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839 // force an oveflow during remark we'll never actually complete the |
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840 // marking phase. So, we initilize this here, at the start of the |
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841 // cycle, so that at the remaining overflow number will decrease at |
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842 // every remark and we'll eventually not need to cause one. |
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843 force_overflow_stw()->init(); |
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844 |
|
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845 // Start Concurrent Marking weak-reference discovery. |
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846 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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847 // enable ("weak") refs discovery |
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848 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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849 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 850 |
| 851 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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852 // This is the start of the marking cycle, we're expected all |
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853 // threads to have SATB queues with active set to false. |
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854 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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855 false /* expected_active */); |
| 342 | 856 |
| 857 // update_g1_committed() will be called at the end of an evac pause | |
| 858 // when marking is on. So, it's also called at the end of the | |
| 859 // initial-mark pause to update the heap end, if the heap expands | |
| 860 // during it. No need to call it here. | |
| 861 } | |
| 862 | |
| 863 /* | |
|
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864 * Notice that in the next two methods, we actually leave the STS |
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865 * during the barrier sync and join it immediately afterwards. If we |
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866 * do not do this, the following deadlock can occur: one thread could |
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867 * be in the barrier sync code, waiting for the other thread to also |
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868 * sync up, whereas another one could be trying to yield, while also |
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869 * waiting for the other threads to sync up too. |
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870 * |
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871 * Note, however, that this code is also used during remark and in |
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872 * this case we should not attempt to leave / enter the STS, otherwise |
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873 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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874 * (product). So we should only leave / enter the STS if we are |
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875 * operating concurrently. |
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876 * |
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877 * Because the thread that does the sync barrier has left the STS, it |
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878 * is possible to be suspended for a Full GC or an evacuation pause |
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879 * could occur. This is actually safe, since the entering the sync |
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880 * barrier is one of the last things do_marking_step() does, and it |
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881 * doesn't manipulate any data structures afterwards. |
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882 */ |
| 342 | 883 |
| 884 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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885 if (verbose_low()) { |
| 342 | 886 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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887 } |
| 342 | 888 |
|
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889 if (concurrent()) { |
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890 ConcurrentGCThread::stsLeave(); |
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891 } |
| 342 | 892 _first_overflow_barrier_sync.enter(); |
|
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893 if (concurrent()) { |
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894 ConcurrentGCThread::stsJoin(); |
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895 } |
| 342 | 896 // at this point everyone should have synced up and not be doing any |
| 897 // more work | |
| 898 | |
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899 if (verbose_low()) { |
| 342 | 900 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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901 } |
| 342 | 902 |
| 903 // let task 0 do this | |
| 904 if (task_num == 0) { | |
| 905 // task 0 is responsible for clearing the global data structures | |
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906 // We should be here because of an overflow. During STW we should |
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907 // not clear the overflow flag since we rely on it being true when |
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908 // we exit this method to abort the pause and restart concurent |
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909 // marking. |
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910 clear_marking_state(concurrent() /* clear_overflow */); |
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911 force_overflow()->update(); |
| 342 | 912 |
| 913 if (PrintGC) { | |
| 914 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
| 915 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 916 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
| 917 } | |
| 918 } | |
| 919 | |
| 920 // after this, each task should reset its own data structures then | |
| 921 // then go into the second barrier | |
| 922 } | |
| 923 | |
| 924 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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925 if (verbose_low()) { |
| 342 | 926 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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927 } |
| 342 | 928 |
|
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929 if (concurrent()) { |
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930 ConcurrentGCThread::stsLeave(); |
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931 } |
| 342 | 932 _second_overflow_barrier_sync.enter(); |
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933 if (concurrent()) { |
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934 ConcurrentGCThread::stsJoin(); |
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935 } |
| 342 | 936 // at this point everything should be re-initialised and ready to go |
| 937 | |
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938 if (verbose_low()) { |
| 342 | 939 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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940 } |
| 342 | 941 } |
| 942 | |
|
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943 #ifndef PRODUCT |
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944 void ForceOverflowSettings::init() { |
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945 _num_remaining = G1ConcMarkForceOverflow; |
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946 _force = false; |
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947 update(); |
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948 } |
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949 |
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950 void ForceOverflowSettings::update() { |
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951 if (_num_remaining > 0) { |
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952 _num_remaining -= 1; |
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953 _force = true; |
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954 } else { |
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955 _force = false; |
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956 } |
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957 } |
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958 |
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959 bool ForceOverflowSettings::should_force() { |
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960 if (_force) { |
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961 _force = false; |
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962 return true; |
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963 } else { |
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964 return false; |
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965 } |
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966 } |
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967 #endif // !PRODUCT |
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968 |
| 342 | 969 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { |
|
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970 guarantee(false, "grayRegionIfNecessary(): don't call this any more"); |
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971 |
| 342 | 972 // The objects on the region have already been marked "in bulk" by |
| 973 // the caller. We only need to decide whether to push the region on | |
| 974 // the region stack or not. | |
| 975 | |
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976 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
| 342 | 977 // We're done with marking and waiting for remark. We do not need to |
| 978 // push anything else on the region stack. | |
| 979 return; | |
|
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980 } |
| 342 | 981 |
| 982 HeapWord* finger = _finger; | |
| 983 | |
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984 if (verbose_low()) { |
| 342 | 985 gclog_or_tty->print_cr("[global] attempting to push " |
| 986 "region ["PTR_FORMAT", "PTR_FORMAT"), finger is at " | |
| 987 PTR_FORMAT, mr.start(), mr.end(), finger); | |
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988 } |
| 342 | 989 |
| 990 if (mr.start() < finger) { | |
| 991 // The finger is always heap region aligned and it is not possible | |
| 992 // for mr to span heap regions. | |
|
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993 assert(mr.end() <= finger, "invariant"); |
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994 |
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995 // Separated the asserts so that we know which one fires. |
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996 assert(mr.start() <= mr.end(), |
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997 "region boundaries should fall within the committed space"); |
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998 assert(_heap_start <= mr.start(), |
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999 "region boundaries should fall within the committed space"); |
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1000 assert(mr.end() <= _heap_end, |
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1001 "region boundaries should fall within the committed space"); |
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1002 if (verbose_low()) { |
| 342 | 1003 gclog_or_tty->print_cr("[global] region ["PTR_FORMAT", "PTR_FORMAT") " |
| 1004 "below the finger, pushing it", | |
| 1005 mr.start(), mr.end()); | |
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1006 } |
| 342 | 1007 |
|
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1008 if (!region_stack_push_lock_free(mr)) { |
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1009 if (verbose_low()) { |
| 342 | 1010 gclog_or_tty->print_cr("[global] region stack has overflown."); |
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1011 } |
| 342 | 1012 } |
| 1013 } | |
| 1014 } | |
| 1015 | |
| 1016 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
|
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1017 guarantee(false, "markAndGrayObjectIfNecessary(): don't call this any more"); |
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1018 |
| 342 | 1019 // The object is not marked by the caller. We need to at least mark |
| 1020 // it and maybe push in on the stack. | |
| 1021 | |
| 1022 HeapWord* addr = (HeapWord*)p; | |
| 1023 if (!_nextMarkBitMap->isMarked(addr)) { | |
| 1024 // We definitely need to mark it, irrespective whether we bail out | |
| 1025 // because we're done with marking. | |
| 1026 if (_nextMarkBitMap->parMark(addr)) { | |
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1027 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
| 342 | 1028 // If we're done with concurrent marking and we're waiting for |
| 1029 // remark, then we're not pushing anything on the stack. | |
| 1030 return; | |
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1031 } |
| 342 | 1032 |
| 1033 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 1034 // CAS done in parMark(addr) above | |
| 1035 HeapWord* finger = _finger; | |
| 1036 | |
| 1037 if (addr < finger) { | |
| 1038 if (!mark_stack_push(oop(addr))) { | |
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1039 if (verbose_low()) { |
| 342 | 1040 gclog_or_tty->print_cr("[global] global stack overflow " |
| 1041 "during parMark"); | |
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1042 } |
| 342 | 1043 } |
| 1044 } | |
| 1045 } | |
| 1046 } | |
| 1047 } | |
| 1048 | |
| 1049 class CMConcurrentMarkingTask: public AbstractGangTask { | |
| 1050 private: | |
| 1051 ConcurrentMark* _cm; | |
| 1052 ConcurrentMarkThread* _cmt; | |
| 1053 | |
| 1054 public: | |
|
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1055 void work(uint worker_id) { |
|
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1056 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1057 "this should only be done by a conc GC thread"); |
|
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1058 ResourceMark rm; |
| 342 | 1059 |
| 1060 double start_vtime = os::elapsedVTime(); | |
| 1061 | |
| 1062 ConcurrentGCThread::stsJoin(); | |
| 1063 | |
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1064 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1065 CMTask* the_task = _cm->task(worker_id); |
| 342 | 1066 the_task->record_start_time(); |
| 1067 if (!_cm->has_aborted()) { | |
| 1068 do { | |
| 1069 double start_vtime_sec = os::elapsedVTime(); | |
| 1070 double start_time_sec = os::elapsedTime(); | |
|
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1071 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1072 |
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1073 the_task->do_marking_step(mark_step_duration_ms, |
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1074 true /* do_stealing */, |
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1075 true /* do_termination */); |
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1076 |
| 342 | 1077 double end_time_sec = os::elapsedTime(); |
| 1078 double end_vtime_sec = os::elapsedVTime(); | |
| 1079 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 1080 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 1081 _cm->clear_has_overflown(); | |
| 1082 | |
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1083 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 1084 |
| 1085 jlong sleep_time_ms; | |
| 1086 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 1087 sleep_time_ms = | |
| 1088 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 1089 ConcurrentGCThread::stsLeave(); | |
| 1090 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 1091 ConcurrentGCThread::stsJoin(); | |
| 1092 } | |
| 1093 double end_time2_sec = os::elapsedTime(); | |
| 1094 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 1095 | |
| 1096 #if 0 | |
| 1097 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 1098 "overhead %1.4lf", | |
| 1099 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 1100 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 1101 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 1102 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 1103 #endif | |
| 1104 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 1105 } | |
| 1106 the_task->record_end_time(); | |
|
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1107 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 1108 |
| 1109 ConcurrentGCThread::stsLeave(); | |
| 1110 | |
| 1111 double end_vtime = os::elapsedVTime(); | |
|
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1112 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 1113 } |
| 1114 | |
| 1115 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 1116 ConcurrentMarkThread* cmt) : | |
| 1117 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 1118 | |
| 1119 ~CMConcurrentMarkingTask() { } | |
| 1120 }; | |
| 1121 | |
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1122 // Calculates the number of active workers for a concurrent |
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1123 // phase. |
|
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1124 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 1125 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1126 uint n_conc_workers = 0; |
|
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1127 if (!UseDynamicNumberOfGCThreads || |
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1128 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1129 !ForceDynamicNumberOfGCThreads)) { |
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1130 n_conc_workers = max_parallel_marking_threads(); |
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1131 } else { |
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1132 n_conc_workers = |
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1133 AdaptiveSizePolicy::calc_default_active_workers( |
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1134 max_parallel_marking_threads(), |
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1135 1, /* Minimum workers */ |
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1136 parallel_marking_threads(), |
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1137 Threads::number_of_non_daemon_threads()); |
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1138 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1139 // that scaling has already gone into "_max_parallel_marking_threads". |
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1140 } |
| 4711 | 1141 assert(n_conc_workers > 0, "Always need at least 1"); |
| 1142 return n_conc_workers; | |
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1143 } |
| 4711 | 1144 // If we are not running with any parallel GC threads we will not |
| 1145 // have spawned any marking threads either. Hence the number of | |
| 1146 // concurrent workers should be 0. | |
| 1147 return 0; | |
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1148 } |
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1149 |
| 342 | 1150 void ConcurrentMark::markFromRoots() { |
| 1151 // we might be tempted to assert that: | |
| 1152 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1153 // "inconsistent argument?"); | |
| 1154 // However that wouldn't be right, because it's possible that | |
| 1155 // a safepoint is indeed in progress as a younger generation | |
| 1156 // stop-the-world GC happens even as we mark in this generation. | |
| 1157 | |
| 1158 _restart_for_overflow = false; | |
|
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1159 force_overflow_conc()->init(); |
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1160 |
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1161 // _g1h has _n_par_threads |
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1162 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1163 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1164 "Maximum number of marking threads exceeded"); |
| 4711 | 1165 |
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1166 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1167 |
| 1168 // Parallel task terminator is set in "set_phase()" | |
| 1169 set_phase(active_workers, true /* concurrent */); | |
| 342 | 1170 |
| 1171 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1172 if (parallel_marking_threads() > 0) { |
| 4711 | 1173 _parallel_workers->set_active_workers((int)active_workers); |
| 1174 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
| 1175 // and the decisions on that MT processing is made elsewhere. | |
| 1176 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1177 _parallel_workers->run_task(&markingTask); |
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1178 } else { |
| 342 | 1179 markingTask.work(0); |
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1180 } |
| 342 | 1181 print_stats(); |
| 1182 } | |
| 1183 | |
| 1184 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1185 // world is stopped at this checkpoint | |
| 1186 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1187 "world should be stopped"); | |
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1188 |
| 342 | 1189 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1190 | |
| 1191 // If a full collection has happened, we shouldn't do this. | |
| 1192 if (has_aborted()) { | |
| 1193 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1194 return; | |
| 1195 } | |
| 1196 | |
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1197 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1198 |
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1199 if (VerifyDuringGC) { |
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1200 HandleMark hm; // handle scope |
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1201 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1202 Universe::heap()->prepare_for_verify(); |
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1203 Universe::verify(/* allow dirty */ true, |
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1204 /* silent */ false, |
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1205 /* option */ VerifyOption_G1UsePrevMarking); |
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1206 } |
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1207 |
| 342 | 1208 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1209 g1p->record_concurrent_mark_remark_start(); | |
| 1210 | |
| 1211 double start = os::elapsedTime(); | |
| 1212 | |
| 1213 checkpointRootsFinalWork(); | |
| 1214 | |
| 1215 double mark_work_end = os::elapsedTime(); | |
| 1216 | |
| 1217 weakRefsWork(clear_all_soft_refs); | |
| 1218 | |
| 1219 if (has_overflown()) { | |
| 1220 // Oops. We overflowed. Restart concurrent marking. | |
| 1221 _restart_for_overflow = true; | |
| 1222 // Clear the flag. We do not need it any more. | |
| 1223 clear_has_overflown(); | |
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1224 if (G1TraceMarkStackOverflow) { |
| 342 | 1225 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1226 } |
| 342 | 1227 } else { |
| 2149 | 1228 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1229 // We're done with marking. |
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1230 // This is the end of the marking cycle, we're expected all |
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1231 // threads to have SATB queues with active set to true. |
| 2149 | 1232 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1233 true /* expected_active */); | |
| 811 | 1234 |
| 1235 if (VerifyDuringGC) { | |
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1236 HandleMark hm; // handle scope |
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1237 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1238 Universe::heap()->prepare_for_verify(); |
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1239 Universe::verify(/* allow dirty */ true, |
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1240 /* silent */ false, |
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1241 /* option */ VerifyOption_G1UseNextMarking); |
| 811 | 1242 } |
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1243 assert(!restart_for_overflow(), "sanity"); |
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1244 } |
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1245 |
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1246 // Reset the marking state if marking completed |
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1247 if (!restart_for_overflow()) { |
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1248 set_non_marking_state(); |
| 342 | 1249 } |
| 1250 | |
| 1251 #if VERIFY_OBJS_PROCESSED | |
| 1252 _scan_obj_cl.objs_processed = 0; | |
| 1253 ThreadLocalObjQueue::objs_enqueued = 0; | |
| 1254 #endif | |
| 1255 | |
| 1256 // Statistics | |
| 1257 double now = os::elapsedTime(); | |
| 1258 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1259 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1260 _remark_times.add((now - start) * 1000.0); | |
| 1261 | |
| 1262 g1p->record_concurrent_mark_remark_end(); | |
| 1263 } | |
| 1264 | |
| 1265 #define CARD_BM_TEST_MODE 0 | |
| 1266 | |
| 1267 class CalcLiveObjectsClosure: public HeapRegionClosure { | |
| 1268 | |
| 1269 CMBitMapRO* _bm; | |
| 1270 ConcurrentMark* _cm; | |
| 1271 bool _changed; | |
| 1272 bool _yield; | |
| 1273 size_t _words_done; | |
| 1274 size_t _tot_live; | |
| 1275 size_t _tot_used; | |
| 1276 size_t _regions_done; | |
| 1277 double _start_vtime_sec; | |
| 1278 | |
| 1279 BitMap* _region_bm; | |
| 1280 BitMap* _card_bm; | |
| 1281 intptr_t _bottom_card_num; | |
| 1282 bool _final; | |
| 1283 | |
| 1284 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
| 1285 for (intptr_t i = start_card_num; i <= last_card_num; i++) { | |
| 1286 #if CARD_BM_TEST_MODE | |
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1287 guarantee(_card_bm->at(i - _bottom_card_num), "Should already be set."); |
| 342 | 1288 #else |
| 1289 _card_bm->par_at_put(i - _bottom_card_num, 1); | |
| 1290 #endif | |
| 1291 } | |
| 1292 } | |
| 1293 | |
| 1294 public: | |
| 1295 CalcLiveObjectsClosure(bool final, | |
| 1296 CMBitMapRO *bm, ConcurrentMark *cm, | |
| 936 | 1297 BitMap* region_bm, BitMap* card_bm) : |
| 342 | 1298 _bm(bm), _cm(cm), _changed(false), _yield(true), |
| 1299 _words_done(0), _tot_live(0), _tot_used(0), | |
| 936 | 1300 _region_bm(region_bm), _card_bm(card_bm),_final(final), |
| 342 | 1301 _regions_done(0), _start_vtime_sec(0.0) |
| 1302 { | |
| 1303 _bottom_card_num = | |
| 1304 intptr_t(uintptr_t(G1CollectedHeap::heap()->reserved_region().start()) >> | |
| 1305 CardTableModRefBS::card_shift); | |
| 1306 } | |
| 1307 | |
| 829 | 1308 // It takes a region that's not empty (i.e., it has at least one |
| 1309 // live object in it and sets its corresponding bit on the region | |
| 1310 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1311 // to 1 the bits on the region bitmap that correspond to its | |
| 1312 // associated "continues humongous" regions. | |
| 1313 void set_bit_for_region(HeapRegion* hr) { | |
| 1314 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1315 | |
| 1316 size_t index = hr->hrs_index(); | |
| 1317 if (!hr->startsHumongous()) { | |
| 1318 // Normal (non-humongous) case: just set the bit. | |
| 1319 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
| 1320 } else { | |
| 1321 // Starts humongous case: calculate how many regions are part of | |
| 1322 // this humongous region and then set the bit range. It might | |
| 1323 // have been a bit more efficient to look at the object that | |
| 1324 // spans these humongous regions to calculate their number from | |
| 1325 // the object's size. However, it's a good idea to calculate | |
| 1326 // this based on the metadata itself, and not the region | |
| 1327 // contents, so that this code is not aware of what goes into | |
| 1328 // the humongous regions (in case this changes in the future). | |
| 1329 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1330 size_t end_index = index + 1; | |
| 831 | 1331 while (end_index < g1h->n_regions()) { |
| 1332 HeapRegion* chr = g1h->region_at(end_index); | |
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1333 if (!chr->continuesHumongous()) break; |
| 829 | 1334 end_index += 1; |
| 1335 } | |
| 1336 _region_bm->par_at_put_range((BitMap::idx_t) index, | |
| 1337 (BitMap::idx_t) end_index, true); | |
| 1338 } | |
| 1339 } | |
| 1340 | |
| 342 | 1341 bool doHeapRegion(HeapRegion* hr) { |
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1342 if (!_final && _regions_done == 0) { |
| 342 | 1343 _start_vtime_sec = os::elapsedVTime(); |
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1344 } |
| 342 | 1345 |
| 639 | 1346 if (hr->continuesHumongous()) { |
| 829 | 1347 // We will ignore these here and process them when their |
| 1348 // associated "starts humongous" region is processed (see | |
| 1349 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1350 // associated "starts humongous" region to have their bit set to | |
| 1351 // 1 since, due to the region chunking in the parallel region | |
| 1352 // iteration, a "continues humongous" region might be visited | |
| 1353 // before its associated "starts humongous". | |
| 639 | 1354 return false; |
| 1355 } | |
| 342 | 1356 |
| 1357 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
| 1358 HeapWord* start = hr->top_at_conc_mark_count(); | |
| 1359 assert(hr->bottom() <= start && start <= hr->end() && | |
| 1360 hr->bottom() <= nextTop && nextTop <= hr->end() && | |
| 1361 start <= nextTop, | |
| 1362 "Preconditions."); | |
| 1363 // Otherwise, record the number of word's we'll examine. | |
| 1364 size_t words_done = (nextTop - start); | |
| 1365 // Find the first marked object at or after "start". | |
| 1366 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
| 1367 size_t marked_bytes = 0; | |
| 1368 | |
| 1369 // Below, the term "card num" means the result of shifting an address | |
| 1370 // by the card shift -- address 0 corresponds to card number 0. One | |
| 1371 // must subtract the card num of the bottom of the heap to obtain a | |
| 1372 // card table index. | |
| 1373 // The first card num of the sequence of live cards currently being | |
| 1374 // constructed. -1 ==> no sequence. | |
| 1375 intptr_t start_card_num = -1; | |
| 1376 // The last card num of the sequence of live cards currently being | |
| 1377 // constructed. -1 ==> no sequence. | |
| 1378 intptr_t last_card_num = -1; | |
| 1379 | |
| 1380 while (start < nextTop) { | |
| 1381 if (_yield && _cm->do_yield_check()) { | |
| 1382 // We yielded. It might be for a full collection, in which case | |
| 1383 // all bets are off; terminate the traversal. | |
| 1384 if (_cm->has_aborted()) { | |
| 1385 _changed = false; | |
| 1386 return true; | |
| 1387 } else { | |
| 1388 // Otherwise, it might be a collection pause, and the region | |
| 1389 // we're looking at might be in the collection set. We'll | |
| 1390 // abandon this region. | |
| 1391 return false; | |
| 1392 } | |
| 1393 } | |
| 1394 oop obj = oop(start); | |
| 1395 int obj_sz = obj->size(); | |
| 1396 // The card num of the start of the current object. | |
| 1397 intptr_t obj_card_num = | |
| 1398 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
| 1399 | |
| 1400 HeapWord* obj_last = start + obj_sz - 1; | |
| 1401 intptr_t obj_last_card_num = | |
| 1402 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
| 1403 | |
| 1404 if (obj_card_num != last_card_num) { | |
| 1405 if (start_card_num == -1) { | |
| 1406 assert(last_card_num == -1, "Both or neither."); | |
| 1407 start_card_num = obj_card_num; | |
| 1408 } else { | |
| 1409 assert(last_card_num != -1, "Both or neither."); | |
| 1410 assert(obj_card_num >= last_card_num, "Inv"); | |
| 1411 if ((obj_card_num - last_card_num) > 1) { | |
| 1412 // Mark the last run, and start a new one. | |
| 1413 mark_card_num_range(start_card_num, last_card_num); | |
| 1414 start_card_num = obj_card_num; | |
| 1415 } | |
| 1416 } | |
| 1417 #if CARD_BM_TEST_MODE | |
| 1418 /* | |
| 1419 gclog_or_tty->print_cr("Setting bits from %d/%d.", | |
| 1420 obj_card_num - _bottom_card_num, | |
| 1421 obj_last_card_num - _bottom_card_num); | |
| 1422 */ | |
| 1423 for (intptr_t j = obj_card_num; j <= obj_last_card_num; j++) { | |
| 1424 _card_bm->par_at_put(j - _bottom_card_num, 1); | |
| 1425 } | |
| 1426 #endif | |
| 1427 } | |
| 1428 // In any case, we set the last card num. | |
| 1429 last_card_num = obj_last_card_num; | |
| 1430 | |
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1431 marked_bytes += (size_t)obj_sz * HeapWordSize; |
| 342 | 1432 // Find the next marked object after this one. |
| 1433 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
| 1434 _changed = true; | |
| 1435 } | |
| 1436 // Handle the last range, if any. | |
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1437 if (start_card_num != -1) { |
| 342 | 1438 mark_card_num_range(start_card_num, last_card_num); |
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1439 } |
| 342 | 1440 if (_final) { |
| 1441 // Mark the allocated-since-marking portion... | |
| 1442 HeapWord* tp = hr->top(); | |
| 1443 if (nextTop < tp) { | |
| 1444 start_card_num = | |
| 1445 intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); | |
| 1446 last_card_num = | |
| 1447 intptr_t(uintptr_t(tp) >> CardTableModRefBS::card_shift); | |
| 1448 mark_card_num_range(start_card_num, last_card_num); | |
| 1449 // This definitely means the region has live objects. | |
| 829 | 1450 set_bit_for_region(hr); |
| 342 | 1451 } |
| 1452 } | |
| 1453 | |
| 1454 hr->add_to_marked_bytes(marked_bytes); | |
| 1455 // Update the live region bitmap. | |
| 1456 if (marked_bytes > 0) { | |
| 829 | 1457 set_bit_for_region(hr); |
| 342 | 1458 } |
| 1459 hr->set_top_at_conc_mark_count(nextTop); | |
| 1460 _tot_live += hr->next_live_bytes(); | |
| 1461 _tot_used += hr->used(); | |
| 1462 _words_done = words_done; | |
| 1463 | |
| 1464 if (!_final) { | |
| 1465 ++_regions_done; | |
| 1466 if (_regions_done % 10 == 0) { | |
| 1467 double end_vtime_sec = os::elapsedVTime(); | |
| 1468 double elapsed_vtime_sec = end_vtime_sec - _start_vtime_sec; | |
| 1469 if (elapsed_vtime_sec > (10.0 / 1000.0)) { | |
| 1470 jlong sleep_time_ms = | |
| 1471 (jlong) (elapsed_vtime_sec * _cm->cleanup_sleep_factor() * 1000.0); | |
| 1472 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 1473 _start_vtime_sec = end_vtime_sec; | |
| 1474 } | |
| 1475 } | |
| 1476 } | |
| 1477 | |
| 1478 return false; | |
| 1479 } | |
| 1480 | |
| 1481 bool changed() { return _changed; } | |
| 1482 void reset() { _changed = false; _words_done = 0; } | |
| 1483 void no_yield() { _yield = false; } | |
| 1484 size_t words_done() { return _words_done; } | |
| 1485 size_t tot_live() { return _tot_live; } | |
| 1486 size_t tot_used() { return _tot_used; } | |
| 1487 }; | |
| 1488 | |
| 1489 | |
| 1490 void ConcurrentMark::calcDesiredRegions() { | |
| 1491 _region_bm.clear(); | |
| 1492 _card_bm.clear(); | |
| 1493 CalcLiveObjectsClosure calccl(false /*final*/, | |
| 1494 nextMarkBitMap(), this, | |
| 936 | 1495 &_region_bm, &_card_bm); |
| 342 | 1496 G1CollectedHeap *g1h = G1CollectedHeap::heap(); |
| 1497 g1h->heap_region_iterate(&calccl); | |
| 1498 | |
| 1499 do { | |
| 1500 calccl.reset(); | |
| 1501 g1h->heap_region_iterate(&calccl); | |
| 1502 } while (calccl.changed()); | |
| 1503 } | |
| 1504 | |
| 1505 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1506 protected: | |
| 1507 G1CollectedHeap* _g1h; | |
| 1508 CMBitMap* _bm; | |
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1509 uint _n_workers; |
| 342 | 1510 size_t *_live_bytes; |
| 1511 size_t *_used_bytes; | |
| 1512 BitMap* _region_bm; | |
| 1513 BitMap* _card_bm; | |
| 1514 public: | |
| 1515 G1ParFinalCountTask(G1CollectedHeap* g1h, CMBitMap* bm, | |
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1516 BitMap* region_bm, BitMap* card_bm) |
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1517 : AbstractGangTask("G1 final counting"), _g1h(g1h), |
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1518 _bm(bm), _region_bm(region_bm), _card_bm(card_bm), |
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1519 _n_workers(0) |
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1520 { |
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1521 // Use the value already set as the number of active threads |
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1522 // in the call to run_task(). Needed for the allocation of |
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1523 // _live_bytes and _used_bytes. |
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1524 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1525 assert( _g1h->workers()->active_workers() > 0, |
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1526 "Should have been previously set"); |
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1527 _n_workers = _g1h->workers()->active_workers(); |
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1528 } else { |
| 342 | 1529 _n_workers = 1; |
|
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1530 } |
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1531 |
| 342 | 1532 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); |
| 1533 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
| 1534 } | |
| 1535 | |
| 1536 ~G1ParFinalCountTask() { | |
| 1537 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
| 1538 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
| 1539 } | |
| 1540 | |
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1541 void work(uint worker_id) { |
| 342 | 1542 CalcLiveObjectsClosure calccl(true /*final*/, |
| 1543 _bm, _g1h->concurrent_mark(), | |
| 936 | 1544 _region_bm, _card_bm); |
| 342 | 1545 calccl.no_yield(); |
|
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1546 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1547 _g1h->heap_region_par_iterate_chunked(&calccl, worker_id, |
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1548 (int) _n_workers, |
| 355 | 1549 HeapRegion::FinalCountClaimValue); |
| 342 | 1550 } else { |
| 1551 _g1h->heap_region_iterate(&calccl); | |
| 1552 } | |
| 1553 assert(calccl.complete(), "Shouldn't have yielded!"); | |
| 1554 | |
|
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1555 assert(worker_id < _n_workers, "invariant"); |
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1556 _live_bytes[worker_id] = calccl.tot_live(); |
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1557 _used_bytes[worker_id] = calccl.tot_used(); |
| 342 | 1558 } |
| 1559 size_t live_bytes() { | |
| 1560 size_t live_bytes = 0; | |
|
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1561 for (uint i = 0; i < _n_workers; ++i) |
| 342 | 1562 live_bytes += _live_bytes[i]; |
| 1563 return live_bytes; | |
| 1564 } | |
| 1565 size_t used_bytes() { | |
| 1566 size_t used_bytes = 0; | |
|
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1567 for (uint i = 0; i < _n_workers; ++i) |
| 342 | 1568 used_bytes += _used_bytes[i]; |
| 1569 return used_bytes; | |
| 1570 } | |
| 1571 }; | |
| 1572 | |
| 1573 class G1ParNoteEndTask; | |
| 1574 | |
| 1575 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1576 G1CollectedHeap* _g1; | |
| 1577 int _worker_num; | |
| 1578 size_t _max_live_bytes; | |
| 1579 size_t _regions_claimed; | |
| 1580 size_t _freed_bytes; | |
| 2173 | 1581 FreeRegionList* _local_cleanup_list; |
| 4072 | 1582 OldRegionSet* _old_proxy_set; |
| 2173 | 1583 HumongousRegionSet* _humongous_proxy_set; |
| 1584 HRRSCleanupTask* _hrrs_cleanup_task; | |
| 342 | 1585 double _claimed_region_time; |
| 1586 double _max_region_time; | |
| 1587 | |
| 1588 public: | |
| 1589 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1590 int worker_num, |
| 1591 FreeRegionList* local_cleanup_list, | |
| 4072 | 1592 OldRegionSet* old_proxy_set, |
| 2173 | 1593 HumongousRegionSet* humongous_proxy_set, |
|
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1594 HRRSCleanupTask* hrrs_cleanup_task) : |
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1595 _g1(g1), _worker_num(worker_num), |
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1596 _max_live_bytes(0), _regions_claimed(0), |
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1597 _freed_bytes(0), |
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1598 _claimed_region_time(0.0), _max_region_time(0.0), |
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1599 _local_cleanup_list(local_cleanup_list), |
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1600 _old_proxy_set(old_proxy_set), |
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1601 _humongous_proxy_set(humongous_proxy_set), |
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1602 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1603 |
| 342 | 1604 size_t freed_bytes() { return _freed_bytes; } |
| 1605 | |
|
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1606 bool doHeapRegion(HeapRegion *hr) { |
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1607 // We use a claim value of zero here because all regions |
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1608 // were claimed with value 1 in the FinalCount task. |
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1609 hr->reset_gc_time_stamp(); |
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1610 if (!hr->continuesHumongous()) { |
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1611 double start = os::elapsedTime(); |
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1612 _regions_claimed++; |
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1613 hr->note_end_of_marking(); |
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1614 _max_live_bytes += hr->max_live_bytes(); |
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1615 _g1->free_region_if_empty(hr, |
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1616 &_freed_bytes, |
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1617 _local_cleanup_list, |
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1618 _old_proxy_set, |
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1619 _humongous_proxy_set, |
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1620 _hrrs_cleanup_task, |
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1621 true /* par */); |
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1622 double region_time = (os::elapsedTime() - start); |
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1623 _claimed_region_time += region_time; |
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1624 if (region_time > _max_region_time) { |
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1625 _max_region_time = region_time; |
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1626 } |
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1627 } |
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1628 return false; |
|
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|
1629 } |
| 342 | 1630 |
| 1631 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1632 size_t regions_claimed() { return _regions_claimed; } | |
| 1633 double claimed_region_time_sec() { return _claimed_region_time; } | |
| 1634 double max_region_time_sec() { return _max_region_time; } | |
| 1635 }; | |
| 1636 | |
| 1637 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1638 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1639 |
| 342 | 1640 protected: |
| 1641 G1CollectedHeap* _g1h; | |
| 1642 size_t _max_live_bytes; | |
| 1643 size_t _freed_bytes; | |
| 2152 | 1644 FreeRegionList* _cleanup_list; |
| 1645 | |
| 342 | 1646 public: |
| 1647 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1648 FreeRegionList* cleanup_list) : |
| 342 | 1649 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1650 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1651 |
|
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1652 void work(uint worker_id) { |
| 342 | 1653 double start = os::elapsedTime(); |
| 2173 | 1654 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 4072 | 1655 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
| 2173 | 1656 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
| 1657 HRRSCleanupTask hrrs_cleanup_task; | |
|
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1658 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
| 4072 | 1659 &old_proxy_set, |
| 2173 | 1660 &humongous_proxy_set, |
| 1661 &hrrs_cleanup_task); | |
|
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1662 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1663 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
|
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1664 _g1h->workers()->active_workers(), |
| 355 | 1665 HeapRegion::NoteEndClaimValue); |
| 342 | 1666 } else { |
| 1667 _g1h->heap_region_iterate(&g1_note_end); | |
| 1668 } | |
| 1669 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1670 | |
| 2152 | 1671 // Now update the lists |
| 1672 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
| 1673 NULL /* free_list */, | |
| 4072 | 1674 &old_proxy_set, |
| 2173 | 1675 &humongous_proxy_set, |
| 2152 | 1676 true /* par */); |
| 342 | 1677 { |
| 1678 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 1679 _max_live_bytes += g1_note_end.max_live_bytes(); | |
| 1680 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1681 |
|
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1682 // If we iterate over the global cleanup list at the end of |
|
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1683 // cleanup to do this printing we will not guarantee to only |
|
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1684 // generate output for the newly-reclaimed regions (the list |
|
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1685 // might not be empty at the beginning of cleanup; we might |
|
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1686 // still be working on its previous contents). So we do the |
|
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1687 // printing here, before we append the new regions to the global |
|
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1688 // cleanup list. |
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1689 |
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1690 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
|
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1691 if (hr_printer->is_active()) { |
|
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1692 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
|
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1693 while (iter.more_available()) { |
|
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1694 HeapRegion* hr = iter.get_next(); |
|
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1695 hr_printer->cleanup(hr); |
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1696 } |
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1697 } |
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1698 |
| 2173 | 1699 _cleanup_list->add_as_tail(&local_cleanup_list); |
| 1700 assert(local_cleanup_list.is_empty(), "post-condition"); | |
| 1701 | |
| 1702 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1703 } |
| 1704 double end = os::elapsedTime(); | |
| 1705 if (G1PrintParCleanupStats) { | |
| 1706 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
|
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1707 "claimed %u regions (tot = %8.3f ms, max = %8.3f ms).\n", |
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1708 worker_id, start, end, (end-start)*1000.0, |
| 342 | 1709 g1_note_end.regions_claimed(), |
| 1710 g1_note_end.claimed_region_time_sec()*1000.0, | |
| 1711 g1_note_end.max_region_time_sec()*1000.0); | |
| 1712 } | |
| 1713 } | |
| 1714 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1715 size_t freed_bytes() { return _freed_bytes; } | |
| 1716 }; | |
| 1717 | |
| 1718 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 1719 protected: | |
| 1720 G1RemSet* _g1rs; | |
| 1721 BitMap* _region_bm; | |
| 1722 BitMap* _card_bm; | |
| 1723 public: | |
| 1724 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 1725 BitMap* region_bm, BitMap* card_bm) : | |
| 1726 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
| 1727 _region_bm(region_bm), _card_bm(card_bm) | |
| 1728 {} | |
| 1729 | |
|
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1730 void work(uint worker_id) { |
|
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1731 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1732 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 1733 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 1734 } else { |
| 1735 _g1rs->scrub(_region_bm, _card_bm); | |
| 1736 } | |
| 1737 } | |
| 1738 | |
| 1739 }; | |
| 1740 | |
| 1741 void ConcurrentMark::cleanup() { | |
| 1742 // world is stopped at this checkpoint | |
| 1743 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1744 "world should be stopped"); | |
| 1745 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1746 | |
| 1747 // If a full collection has happened, we shouldn't do this. | |
| 1748 if (has_aborted()) { | |
| 1749 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1750 return; | |
| 1751 } | |
| 1752 | |
| 4072 | 1753 HRSPhaseSetter x(HRSPhaseCleanup); |
| 2152 | 1754 g1h->verify_region_sets_optional(); |
| 1755 | |
|
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1756 if (VerifyDuringGC) { |
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1757 HandleMark hm; // handle scope |
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1758 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1759 Universe::heap()->prepare_for_verify(); |
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1760 Universe::verify(/* allow dirty */ true, |
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1761 /* silent */ false, |
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1762 /* option */ VerifyOption_G1UsePrevMarking); |
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1763 } |
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1764 |
| 342 | 1765 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 1766 g1p->record_concurrent_mark_cleanup_start(); | |
| 1767 | |
| 1768 double start = os::elapsedTime(); | |
| 1769 | |
| 2173 | 1770 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 1771 | |
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1772 uint n_workers; |
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1773 |
| 342 | 1774 // Do counting once more with the world stopped for good measure. |
| 1775 G1ParFinalCountTask g1_par_count_task(g1h, nextMarkBitMap(), | |
| 1776 &_region_bm, &_card_bm); | |
|
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1777 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 355 | 1778 assert(g1h->check_heap_region_claim_values( |
| 1779 HeapRegion::InitialClaimValue), | |
| 1780 "sanity check"); | |
| 1781 | |
| 4711 | 1782 g1h->set_par_threads(); |
| 1783 n_workers = g1h->n_par_threads(); | |
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1784 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 1785 "Should not have been reset"); |
| 342 | 1786 g1h->workers()->run_task(&g1_par_count_task); |
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1787 // Done with the parallel phase so reset to 0. |
| 342 | 1788 g1h->set_par_threads(0); |
| 355 | 1789 |
| 1790 assert(g1h->check_heap_region_claim_values( | |
| 1791 HeapRegion::FinalCountClaimValue), | |
| 1792 "sanity check"); | |
| 342 | 1793 } else { |
| 4711 | 1794 n_workers = 1; |
| 342 | 1795 g1_par_count_task.work(0); |
| 1796 } | |
| 1797 | |
| 1798 size_t known_garbage_bytes = | |
| 1799 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
| 1800 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
| 1801 | |
| 1802 size_t start_used_bytes = g1h->used(); | |
| 1803 _at_least_one_mark_complete = true; | |
| 1804 g1h->set_marking_complete(); | |
| 1805 | |
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1806 ergo_verbose4(ErgoConcCycles, |
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1807 "finish cleanup", |
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1808 ergo_format_byte("occupancy") |
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1809 ergo_format_byte("capacity") |
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1810 ergo_format_byte_perc("known garbage"), |
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1811 start_used_bytes, g1h->capacity(), |
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1812 known_garbage_bytes, |
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1813 ((double) known_garbage_bytes / (double) g1h->capacity()) * 100.0); |
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1814 |
| 342 | 1815 double count_end = os::elapsedTime(); |
| 1816 double this_final_counting_time = (count_end - start); | |
| 1817 if (G1PrintParCleanupStats) { | |
| 1818 gclog_or_tty->print_cr("Cleanup:"); | |
| 1819 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
| 1820 this_final_counting_time*1000.0); | |
| 1821 } | |
| 1822 _total_counting_time += this_final_counting_time; | |
| 1823 | |
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1824 if (G1PrintRegionLivenessInfo) { |
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1825 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1826 _g1h->heap_region_iterate(&cl); |
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1827 } |
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1828 |
| 342 | 1829 // Install newly created mark bitMap as "prev". |
| 1830 swapMarkBitMaps(); | |
| 1831 | |
| 1832 g1h->reset_gc_time_stamp(); | |
| 1833 | |
| 1834 // Note end of marking in all heap regions. | |
| 1835 double note_end_start = os::elapsedTime(); | |
| 2152 | 1836 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
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1837 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1838 g1h->set_par_threads((int)n_workers); |
| 342 | 1839 g1h->workers()->run_task(&g1_par_note_end_task); |
| 1840 g1h->set_par_threads(0); | |
| 355 | 1841 |
| 1842 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 1843 "sanity check"); | |
| 342 | 1844 } else { |
| 1845 g1_par_note_end_task.work(0); | |
| 1846 } | |
| 2152 | 1847 |
| 1848 if (!cleanup_list_is_empty()) { | |
| 1849 // The cleanup list is not empty, so we'll have to process it | |
| 1850 // concurrently. Notify anyone else that might be wanting free | |
| 1851 // regions that there will be more free regions coming soon. | |
| 1852 g1h->set_free_regions_coming(); | |
| 1853 } | |
| 342 | 1854 double note_end_end = os::elapsedTime(); |
| 1855 if (G1PrintParCleanupStats) { | |
| 1856 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
| 1857 (note_end_end - note_end_start)*1000.0); | |
| 1858 } | |
| 1859 | |
| 1860 // call below, since it affects the metric by which we sort the heap | |
| 1861 // regions. | |
| 1862 if (G1ScrubRemSets) { | |
| 1863 double rs_scrub_start = os::elapsedTime(); | |
| 1864 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
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1865 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1866 g1h->set_par_threads((int)n_workers); |
| 342 | 1867 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 1868 g1h->set_par_threads(0); | |
| 355 | 1869 |
| 1870 assert(g1h->check_heap_region_claim_values( | |
| 1871 HeapRegion::ScrubRemSetClaimValue), | |
| 1872 "sanity check"); | |
| 342 | 1873 } else { |
| 1874 g1_par_scrub_rs_task.work(0); | |
| 1875 } | |
| 1876 | |
| 1877 double rs_scrub_end = os::elapsedTime(); | |
| 1878 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 1879 _total_rs_scrub_time += this_rs_scrub_time; | |
| 1880 } | |
| 1881 | |
| 1882 // this will also free any regions totally full of garbage objects, | |
| 1883 // and sort the regions. | |
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1884 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 1885 |
| 1886 // Statistics. | |
| 1887 double end = os::elapsedTime(); | |
| 1888 _cleanup_times.add((end - start) * 1000.0); | |
| 1889 | |
| 1890 if (PrintGC || PrintGCDetails) { | |
| 1891 g1h->print_size_transition(gclog_or_tty, | |
| 1892 start_used_bytes, | |
| 1893 g1h->used(), | |
| 1894 g1h->capacity()); | |
| 1895 } | |
| 1896 | |
| 1897 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
| 1898 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
| 1899 | |
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1900 // Clean up will have freed any regions completely full of garbage. |
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1901 // Update the soft reference policy with the new heap occupancy. |
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1902 Universe::update_heap_info_at_gc(); |
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1903 |
| 342 | 1904 // We need to make this be a "collection" so any collection pause that |
| 1905 // races with it goes around and waits for completeCleanup to finish. | |
| 1906 g1h->increment_total_collections(); | |
| 1907 | |
| 751 | 1908 if (VerifyDuringGC) { |
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1909 HandleMark hm; // handle scope |
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1910 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1911 Universe::heap()->prepare_for_verify(); |
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1912 Universe::verify(/* allow dirty */ true, |
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1913 /* silent */ false, |
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1914 /* option */ VerifyOption_G1UsePrevMarking); |
| 342 | 1915 } |
| 2152 | 1916 |
| 1917 g1h->verify_region_sets_optional(); | |
| 342 | 1918 } |
| 1919 | |
| 1920 void ConcurrentMark::completeCleanup() { | |
| 1921 if (has_aborted()) return; | |
| 1922 | |
| 2152 | 1923 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1924 | |
| 1925 _cleanup_list.verify_optional(); | |
| 2361 | 1926 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 1927 |
| 1928 if (G1ConcRegionFreeingVerbose) { | |
| 1929 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
| 1930 "cleanup list has "SIZE_FORMAT" entries", | |
| 1931 _cleanup_list.length()); | |
| 1932 } | |
| 1933 | |
| 1934 // Noone else should be accessing the _cleanup_list at this point, | |
| 1935 // so it's not necessary to take any locks | |
| 1936 while (!_cleanup_list.is_empty()) { | |
| 1937 HeapRegion* hr = _cleanup_list.remove_head(); | |
| 1938 assert(hr != NULL, "the list was not empty"); | |
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1939 hr->par_clear(); |
| 2361 | 1940 tmp_free_list.add_as_tail(hr); |
| 2152 | 1941 |
| 1942 // Instead of adding one region at a time to the secondary_free_list, | |
| 1943 // we accumulate them in the local list and move them a few at a | |
| 1944 // time. This also cuts down on the number of notify_all() calls | |
| 1945 // we do during this process. We'll also append the local list when | |
| 1946 // _cleanup_list is empty (which means we just removed the last | |
| 1947 // region from the _cleanup_list). | |
| 2361 | 1948 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 1949 _cleanup_list.is_empty()) { |
| 1950 if (G1ConcRegionFreeingVerbose) { | |
| 1951 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
| 1952 "appending "SIZE_FORMAT" entries to the " | |
| 1953 "secondary_free_list, clean list still has " | |
| 1954 SIZE_FORMAT" entries", | |
| 2361 | 1955 tmp_free_list.length(), |
| 2152 | 1956 _cleanup_list.length()); |
| 342 | 1957 } |
| 2152 | 1958 |
| 1959 { | |
| 1960 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 2361 | 1961 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
| 2152 | 1962 SecondaryFreeList_lock->notify_all(); |
| 1963 } | |
| 1964 | |
| 1965 if (G1StressConcRegionFreeing) { | |
| 1966 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 1967 os::sleep(Thread::current(), (jlong) 1, false); | |
| 1968 } | |
| 1969 } | |
| 342 | 1970 } |
| 1971 } | |
| 2361 | 1972 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 1973 } |
| 1974 | |
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1975 // Support closures for reference procssing in G1 |
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1976 |
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1977 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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1978 HeapWord* addr = (HeapWord*)obj; |
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1979 return addr != NULL && |
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1980 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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1981 } |
| 342 | 1982 |
| 1983 class G1CMKeepAliveClosure: public OopClosure { | |
| 1984 G1CollectedHeap* _g1; | |
| 1985 ConcurrentMark* _cm; | |
| 1986 CMBitMap* _bitMap; | |
| 1987 public: | |
| 1988 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm, | |
| 1989 CMBitMap* bitMap) : | |
| 1990 _g1(g1), _cm(cm), | |
| 1991 _bitMap(bitMap) {} | |
| 1992 | |
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1993 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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1994 virtual void do_oop( oop* p) { do_oop_work(p); } |
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1995 |
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1996 template <class T> void do_oop_work(T* p) { |
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1997 oop obj = oopDesc::load_decode_heap_oop(p); |
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1998 HeapWord* addr = (HeapWord*)obj; |
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1999 |
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2000 if (_cm->verbose_high()) { |
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2001 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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2002 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2003 p, (void*) obj); |
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2004 } |
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2005 |
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2006 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
| 342 | 2007 _bitMap->mark(addr); |
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2008 _cm->mark_stack_push(obj); |
| 342 | 2009 } |
| 2010 } | |
| 2011 }; | |
| 2012 | |
| 2013 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
| 2014 CMMarkStack* _markStack; | |
| 2015 CMBitMap* _bitMap; | |
| 2016 G1CMKeepAliveClosure* _oopClosure; | |
| 2017 public: | |
| 2018 G1CMDrainMarkingStackClosure(CMBitMap* bitMap, CMMarkStack* markStack, | |
| 2019 G1CMKeepAliveClosure* oopClosure) : | |
| 2020 _bitMap(bitMap), | |
| 2021 _markStack(markStack), | |
| 2022 _oopClosure(oopClosure) | |
| 2023 {} | |
| 2024 | |
| 2025 void do_void() { | |
| 2026 _markStack->drain((OopClosure*)_oopClosure, _bitMap, false); | |
| 2027 } | |
| 2028 }; | |
| 2029 | |
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2030 // 'Keep Alive' closure used by parallel reference processing. |
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2031 // An instance of this closure is used in the parallel reference processing |
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2032 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2033 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2034 // placed on to discovered ref lists once so we can mark and push with no |
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2035 // need to check whether the object has already been marked. Using the |
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2036 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2037 // operating on the global mark stack. This means that an individual |
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2038 // worker would be doing lock-free pushes while it processes its own |
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2039 // discovered ref list followed by drain call. If the discovered ref lists |
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2040 // are unbalanced then this could cause interference with the other |
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2041 // workers. Using a CMTask (and its embedded local data structures) |
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2042 // avoids that potential interference. |
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2043 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2044 ConcurrentMark* _cm; |
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2045 CMTask* _task; |
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2046 int _ref_counter_limit; |
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2047 int _ref_counter; |
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2048 public: |
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2049 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2050 _cm(cm), _task(task), |
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2051 _ref_counter_limit(G1RefProcDrainInterval) { |
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2052 assert(_ref_counter_limit > 0, "sanity"); |
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2053 _ref_counter = _ref_counter_limit; |
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2054 } |
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2055 |
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2056 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2057 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2058 |
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2059 template <class T> void do_oop_work(T* p) { |
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2060 if (!_cm->has_overflown()) { |
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2061 oop obj = oopDesc::load_decode_heap_oop(p); |
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2062 if (_cm->verbose_high()) { |
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2063 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2064 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2065 _task->task_id(), p, (void*) obj); |
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2066 } |
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2067 |
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2068 _task->deal_with_reference(obj); |
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2069 _ref_counter--; |
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2070 |
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2071 if (_ref_counter == 0) { |
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2072 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2073 // reachable from them on to the local stack (and possibly the global stack). |
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2074 // Call do_marking_step() to process these entries. We call the routine in a |
|
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2075 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2076 // with the entries that we've pushed as a result of the deal_with_reference |
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2077 // calls above) or we overflow. |
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2078 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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2079 // while there may still be some work to do. (See the comment at the |
|
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2080 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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|
2081 // is reaching the specified time target.) It is only when |
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2082 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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|
2083 // that the marking has completed. |
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|
2084 do { |
|
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2085 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2086 _task->do_marking_step(mark_step_duration_ms, |
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|
2087 false /* do_stealing */, |
|
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|
2088 false /* do_termination */); |
|
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|
2089 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2090 _ref_counter = _ref_counter_limit; |
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|
2091 } |
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|
2092 } else { |
|
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|
2093 if (_cm->verbose_high()) { |
|
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|
2094 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
|
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|
2095 } |
|
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|
2096 } |
|
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|
2097 } |
|
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|
2098 }; |
|
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|
2099 |
|
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|
2100 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
|
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|
2101 ConcurrentMark* _cm; |
|
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|
2102 CMTask* _task; |
|
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|
2103 public: |
|
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|
2104 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
|
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|
2105 _cm(cm), _task(task) |
|
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|
2106 {} |
|
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|
2107 |
|
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|
2108 void do_void() { |
|
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|
2109 do { |
|
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|
2110 if (_cm->verbose_high()) { |
|
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|
2111 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
|
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|
2112 _task->task_id()); |
|
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|
2113 } |
|
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|
2114 |
|
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|
2115 // We call CMTask::do_marking_step() to completely drain the local and |
|
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|
2116 // global marking stacks. The routine is called in a loop, which we'll |
|
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|
2117 // exit if there's nothing more to do (i.e. we'completely drained the |
|
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|
2118 // entries that were pushed as a result of applying the |
|
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|
2119 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
|
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|
2120 // lists above) or we overflow the global marking stack. |
|
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|
2121 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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|
2122 // while there may still be some work to do. (See the comment at the |
|
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|
2123 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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|
2124 // is reaching the specified time target.) It is only when |
|
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|
2125 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2126 // that the marking has completed. |
|
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|
2127 |
|
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|
2128 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2129 true /* do_stealing */, |
|
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|
2130 true /* do_termination */); |
|
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|
2131 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2132 } |
|
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|
2133 }; |
|
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|
2134 |
|
3979
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|
2135 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
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|
2136 // reference processing at the end of G1 concurrent marking |
|
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|
2137 |
|
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|
2138 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
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|
2139 private: |
|
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|
2140 G1CollectedHeap* _g1h; |
|
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|
2141 ConcurrentMark* _cm; |
|
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|
2142 WorkGang* _workers; |
|
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|
2143 int _active_workers; |
|
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|
2144 |
|
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|
2145 public: |
|
3979
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|
2146 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
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|
2147 ConcurrentMark* cm, |
|
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|
2148 WorkGang* workers, |
|
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|
2149 int n_workers) : |
|
4093
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|
2150 _g1h(g1h), _cm(cm), |
|
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|
2151 _workers(workers), _active_workers(n_workers) { } |
|
2174
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|
2152 |
|
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|
2153 // Executes the given task using concurrent marking worker threads. |
|
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|
2154 virtual void execute(ProcessTask& task); |
|
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|
2155 virtual void execute(EnqueueTask& task); |
|
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|
2156 }; |
|
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|
2157 |
|
3979
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2158 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
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2159 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2160 ProcessTask& _proc_task; |
|
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2161 G1CollectedHeap* _g1h; |
|
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2162 ConcurrentMark* _cm; |
|
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2163 |
|
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2164 public: |
|
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2165 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
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2166 G1CollectedHeap* g1h, |
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2167 ConcurrentMark* cm) : |
|
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2168 AbstractGangTask("Process reference objects in parallel"), |
|
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2169 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
|
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2170 |
|
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2171 virtual void work(uint worker_id) { |
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2172 CMTask* marking_task = _cm->task(worker_id); |
|
2174
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2173 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
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2174 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
|
2174
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2175 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
|
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2176 |
|
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2177 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
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2178 } |
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2179 }; |
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2180 |
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2181 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
2174
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2182 assert(_workers != NULL, "Need parallel worker threads."); |
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2183 |
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2184 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
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2185 |
|
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2186 // We need to reset the phase for each task execution so that |
|
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2187 // the termination protocol of CMTask::do_marking_step works. |
|
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2188 _cm->set_phase(_active_workers, false /* concurrent */); |
|
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2189 _g1h->set_par_threads(_active_workers); |
|
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2190 _workers->run_task(&proc_task_proxy); |
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2191 _g1h->set_par_threads(0); |
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2192 } |
|
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2193 |
|
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2194 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
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2195 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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2196 EnqueueTask& _enq_task; |
|
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2197 |
|
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2198 public: |
|
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2199 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
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2200 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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2201 _enq_task(enq_task) { } |
|
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2202 |
|
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2203 virtual void work(uint worker_id) { |
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2204 _enq_task.work(worker_id); |
|
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2205 } |
|
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2206 }; |
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2207 |
|
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2208 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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2209 assert(_workers != NULL, "Need parallel worker threads."); |
|
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2210 |
|
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2211 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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2212 |
|
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2213 _g1h->set_par_threads(_active_workers); |
|
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2214 _workers->run_task(&enq_task_proxy); |
|
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2215 _g1h->set_par_threads(0); |
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2216 } |
|
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2217 |
| 342 | 2218 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
| 2219 ResourceMark rm; | |
| 2220 HandleMark hm; | |
|
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2221 |
|
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2222 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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2223 |
|
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2224 // Is alive closure. |
|
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|
2225 G1CMIsAliveClosure g1_is_alive(g1h); |
|
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|
2226 |
|
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2227 // Inner scope to exclude the cleaning of the string and symbol |
|
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|
2228 // tables from the displayed time. |
|
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|
2229 { |
|
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|
2230 bool verbose = PrintGC && PrintGCDetails; |
|
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|
2231 if (verbose) { |
|
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|
2232 gclog_or_tty->put(' '); |
|
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|
2233 } |
|
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|
2234 TraceTime t("GC ref-proc", verbose, false, gclog_or_tty); |
|
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|
2235 |
|
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|
2236 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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2237 |
|
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|
2238 // See the comment in G1CollectedHeap::ref_processing_init() |
|
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|
2239 // about how reference processing currently works in G1. |
|
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|
2240 |
|
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|
2241 // Process weak references. |
|
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|
2242 rp->setup_policy(clear_all_soft_refs); |
|
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|
2243 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
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2244 |
|
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|
2245 G1CMKeepAliveClosure g1_keep_alive(g1h, this, nextMarkBitMap()); |
|
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|
2246 G1CMDrainMarkingStackClosure |
|
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|
2247 g1_drain_mark_stack(nextMarkBitMap(), &_markStack, &g1_keep_alive); |
|
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2248 |
|
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|
2249 // We use the work gang from the G1CollectedHeap and we utilize all |
|
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|
2250 // the worker threads. |
|
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2251 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
|
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2252 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
|
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2253 |
|
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2254 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
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|
2255 g1h->workers(), active_workers); |
|
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|
2256 |
|
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|
2257 if (rp->processing_is_mt()) { |
|
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|
2258 // Set the degree of MT here. If the discovery is done MT, there |
|
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|
2259 // may have been a different number of threads doing the discovery |
|
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|
2260 // and a different number of discovered lists may have Ref objects. |
|
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|
2261 // That is OK as long as the Reference lists are balanced (see |
|
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|
2262 // balance_all_queues() and balance_queues()). |
|
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|
2263 rp->set_active_mt_degree(active_workers); |
|
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|
2264 |
|
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|
2265 rp->process_discovered_references(&g1_is_alive, |
|
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|
2266 &g1_keep_alive, |
|
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|
2267 &g1_drain_mark_stack, |
|
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|
2268 &par_task_executor); |
|
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|
2269 |
|
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|
2270 // The work routines of the parallel keep_alive and drain_marking_stack |
|
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|
2271 // will set the has_overflown flag if we overflow the global marking |
|
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|
2272 // stack. |
|
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|
2273 } else { |
|
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|
2274 rp->process_discovered_references(&g1_is_alive, |
|
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|
2275 &g1_keep_alive, |
|
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|
2276 &g1_drain_mark_stack, |
|
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|
2277 NULL); |
|
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|
2278 } |
|
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|
2279 |
|
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|
2280 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
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|
2281 "mark stack should be empty (unless it overflowed)"); |
|
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|
2282 if (_markStack.overflow()) { |
|
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|
2283 // Should have been done already when we tried to push an |
|
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|
2284 // entry on to the global mark stack. But let's do it again. |
|
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|
2285 set_has_overflown(); |
|
1847b501ae74
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johnc
parents:
3914
diff
changeset
|
2286 } |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2287 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2288 if (rp->processing_is_mt()) { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2289 assert(rp->num_q() == active_workers, "why not"); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2290 rp->enqueue_discovered_references(&par_task_executor); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2291 } else { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2292 rp->enqueue_discovered_references(); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2293 } |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2294 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2295 rp->verify_no_references_recorded(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2296 assert(!rp->discovery_enabled(), "Post condition"); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2297 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2298 |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2299 // Now clean up stale oops in StringTable |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2300 StringTable::unlink(&g1_is_alive); |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2301 // Clean up unreferenced symbols in symbol table. |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2302 SymbolTable::unlink(); |
| 342 | 2303 } |
| 2304 | |
| 2305 void ConcurrentMark::swapMarkBitMaps() { | |
| 2306 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2307 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2308 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2309 } | |
| 2310 | |
| 2311 class CMRemarkTask: public AbstractGangTask { | |
| 2312 private: | |
| 2313 ConcurrentMark *_cm; | |
| 2314 | |
| 2315 public: | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2316 void work(uint worker_id) { |
| 342 | 2317 // Since all available tasks are actually started, we should |
| 2318 // 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
|
2319 if (worker_id < _cm->active_tasks()) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2320 CMTask* task = _cm->task(worker_id); |
| 342 | 2321 task->record_start_time(); |
| 2322 do { | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2323 task->do_marking_step(1000000000.0 /* something very large */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2324 true /* do_stealing */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2325 true /* do_termination */); |
| 342 | 2326 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2327 // If we overflow, then we do not want to restart. We instead | |
| 2328 // want to abort remark and do concurrent marking again. | |
| 2329 task->record_end_time(); | |
| 2330 } | |
| 2331 } | |
| 2332 | |
| 4711 | 2333 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2334 AbstractGangTask("Par Remark"), _cm(cm) { |
| 4711 | 2335 _cm->terminator()->reset_for_reuse(active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2336 } |
| 342 | 2337 }; |
| 2338 | |
| 2339 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2340 ResourceMark rm; | |
| 2341 HandleMark hm; | |
| 2342 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2343 | |
| 2344 g1h->ensure_parsability(false); | |
| 2345 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2346 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2347 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2348 // 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
|
2349 uint active_workers = g1h->workers()->active_workers(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2350 if (active_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2351 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
|
2352 active_workers = (uint) ParallelGCThreads; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2353 g1h->workers()->set_active_workers(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2354 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2355 set_phase(active_workers, false /* concurrent */); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2356 // Leave _parallel_marking_threads at it's |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2357 // value originally calculated in the ConcurrentMark |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2358 // constructor and pass values of the active workers |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2359 // through the gang in the task. |
| 342 | 2360 |
| 4711 | 2361 CMRemarkTask remarkTask(this, active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2362 g1h->set_par_threads(active_workers); |
| 342 | 2363 g1h->workers()->run_task(&remarkTask); |
| 2364 g1h->set_par_threads(0); | |
| 2365 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2366 G1CollectedHeap::StrongRootsScope srs(g1h); |
| 342 | 2367 // 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
|
2368 uint active_workers = 1; |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2369 set_phase(active_workers, false /* concurrent */); |
| 342 | 2370 |
| 4711 | 2371 CMRemarkTask remarkTask(this, active_workers); |
| 342 | 2372 // We will start all available threads, even if we decide that the |
| 2373 // active_workers will be fewer. The extra ones will just bail out | |
| 2374 // immediately. | |
| 2375 remarkTask.work(0); | |
| 2376 } | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2377 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2378 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2379 |
| 2380 print_stats(); | |
| 2381 | |
| 2382 #if VERIFY_OBJS_PROCESSED | |
| 2383 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
| 2384 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
| 2385 _scan_obj_cl.objs_processed, | |
| 2386 ThreadLocalObjQueue::objs_enqueued); | |
| 2387 guarantee(_scan_obj_cl.objs_processed == | |
| 2388 ThreadLocalObjQueue::objs_enqueued, | |
| 2389 "Different number of objs processed and enqueued."); | |
| 2390 } | |
| 2391 #endif | |
| 2392 } | |
| 2393 | |
| 1044 | 2394 #ifndef PRODUCT |
| 2395 | |
| 1388 | 2396 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2397 private: |
| 2398 G1CollectedHeap* _g1h; | |
| 2399 outputStream* _out; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2400 VerifyOption _vo; |
| 1388 | 2401 bool _all; |
| 342 | 2402 |
| 2403 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2404 PrintReachableOopClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2405 VerifyOption vo, |
| 1388 | 2406 bool all) : |
| 1044 | 2407 _g1h(G1CollectedHeap::heap()), |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2408 _out(out), _vo(vo), _all(all) { } |
| 342 | 2409 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2410 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
|
2411 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
|
2412 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2413 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
|
2414 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2415 const char* str = NULL; |
| 2416 const char* str2 = ""; | |
| 2417 | |
| 1388 | 2418 if (obj == NULL) { |
| 2419 str = ""; | |
| 2420 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2421 str = " O"; | |
| 2422 } else { | |
| 342 | 2423 HeapRegion* hr = _g1h->heap_region_containing(obj); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2424 guarantee(hr != NULL, "invariant"); |
| 1044 | 2425 bool over_tams = false; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2426 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2427 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2428 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2429 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2430 over_tams = hr->obj_allocated_since_prev_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2431 marked = _g1h->isMarkedPrev(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2432 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2433 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2434 over_tams = hr->obj_allocated_since_next_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2435 marked = _g1h->isMarkedNext(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2436 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2437 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2438 marked = obj->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2439 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2440 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2441 ShouldNotReachHere(); |
| 1044 | 2442 } |
| 2443 | |
| 2444 if (over_tams) { | |
| 1388 | 2445 str = " >"; |
| 2446 if (marked) { | |
| 342 | 2447 str2 = " AND MARKED"; |
| 1044 | 2448 } |
| 1388 | 2449 } else if (marked) { |
| 2450 str = " M"; | |
| 1044 | 2451 } else { |
| 1388 | 2452 str = " NOT"; |
| 1044 | 2453 } |
| 342 | 2454 } |
| 2455 | |
| 1388 | 2456 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
| 342 | 2457 p, (void*) obj, str, str2); |
| 2458 } | |
| 2459 }; | |
| 2460 | |
| 1388 | 2461 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2462 private: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2463 G1CollectedHeap* _g1h; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2464 outputStream* _out; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2465 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2466 bool _all; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2467 HeapRegion* _hr; |
| 342 | 2468 |
| 2469 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2470 PrintReachableObjectClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2471 VerifyOption vo, |
| 1388 | 2472 bool all, |
| 2473 HeapRegion* hr) : | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2474 _g1h(G1CollectedHeap::heap()), |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2475 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2476 |
| 2477 void do_object(oop o) { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2478 bool over_tams = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2479 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2480 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2481 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2482 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2483 over_tams = _hr->obj_allocated_since_prev_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2484 marked = _g1h->isMarkedPrev(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2485 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2486 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2487 over_tams = _hr->obj_allocated_since_next_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2488 marked = _g1h->isMarkedNext(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2489 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2490 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2491 marked = o->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2492 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2493 default: |
|
6747fd0512e0
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2494 ShouldNotReachHere(); |
| 1388 | 2495 } |
| 2496 bool print_it = _all || over_tams || marked; | |
| 2497 | |
| 2498 if (print_it) { | |
| 2499 _out->print_cr(" "PTR_FORMAT"%s", | |
| 2500 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
|
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2501 PrintReachableOopClosure oopCl(_out, _vo, _all); |
| 1388 | 2502 o->oop_iterate(&oopCl); |
| 2503 } | |
| 342 | 2504 } |
| 2505 }; | |
| 2506 | |
| 1388 | 2507 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2508 private: |
| 2509 outputStream* _out; | |
|
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2510 VerifyOption _vo; |
| 1388 | 2511 bool _all; |
| 342 | 2512 |
| 2513 public: | |
| 2514 bool doHeapRegion(HeapRegion* hr) { | |
| 2515 HeapWord* b = hr->bottom(); | |
| 2516 HeapWord* e = hr->end(); | |
| 2517 HeapWord* t = hr->top(); | |
| 1044 | 2518 HeapWord* p = NULL; |
|
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2519 |
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2520 switch (_vo) { |
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2521 case VerifyOption_G1UsePrevMarking: |
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2522 p = hr->prev_top_at_mark_start(); |
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2523 break; |
|
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2524 case VerifyOption_G1UseNextMarking: |
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2525 p = hr->next_top_at_mark_start(); |
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2526 break; |
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2527 case VerifyOption_G1UseMarkWord: |
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2528 // When we are verifying marking using the mark word |
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2529 // TAMS has no relevance. |
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2530 assert(p == NULL, "post-condition"); |
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2531 break; |
|
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2532 default: |
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|
2533 ShouldNotReachHere(); |
| 1044 | 2534 } |
| 342 | 2535 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
| 1044 | 2536 "TAMS: "PTR_FORMAT, b, e, t, p); |
| 1388 | 2537 _out->cr(); |
| 2538 | |
| 2539 HeapWord* from = b; | |
| 2540 HeapWord* to = t; | |
| 2541 | |
| 2542 if (to > from) { | |
| 2543 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
| 2544 _out->cr(); | |
|
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2545 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2546 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2547 _out->cr(); | |
| 2548 } | |
| 342 | 2549 |
| 2550 return false; | |
| 2551 } | |
| 2552 | |
|
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2553 PrintReachableRegionClosure(outputStream* out, |
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2554 VerifyOption vo, |
| 1388 | 2555 bool all) : |
|
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2556 _out(out), _vo(vo), _all(all) { } |
| 342 | 2557 }; |
| 2558 | |
|
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2559 static const char* verify_option_to_tams(VerifyOption vo) { |
|
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2560 switch (vo) { |
|
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2561 case VerifyOption_G1UsePrevMarking: |
|
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|
2562 return "PTAMS"; |
|
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|
2563 case VerifyOption_G1UseNextMarking: |
|
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|
2564 return "NTAMS"; |
|
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|
2565 default: |
|
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|
2566 return "NONE"; |
|
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|
2567 } |
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|
2568 } |
|
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|
2569 |
| 1388 | 2570 void ConcurrentMark::print_reachable(const char* str, |
|
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|
2571 VerifyOption vo, |
| 1388 | 2572 bool all) { |
| 2573 gclog_or_tty->cr(); | |
| 2574 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 2575 |
| 2576 if (G1PrintReachableBaseFile == NULL) { | |
| 2577 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 2578 return; | |
| 2579 } | |
| 2580 | |
| 2581 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 2582 (JVM_MAXPATHLEN - 1)) { | |
| 2583 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 2584 return; | |
| 2585 } | |
| 2586 | |
| 2587 char file_name[JVM_MAXPATHLEN]; | |
| 2588 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 2589 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 2590 | |
| 2591 fileStream fout(file_name); | |
| 2592 if (!fout.is_open()) { | |
| 2593 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 2594 return; | |
| 2595 } | |
| 2596 | |
| 2597 outputStream* out = &fout; | |
|
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|
2598 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
| 1044 | 2599 out->cr(); |
| 2600 | |
| 1388 | 2601 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2602 out->cr(); |
|
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|
2603 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 2604 _g1h->heap_region_iterate(&rcl); |
| 1044 | 2605 out->cr(); |
| 2606 | |
| 2607 gclog_or_tty->print_cr(" done"); | |
| 1388 | 2608 gclog_or_tty->flush(); |
| 342 | 2609 } |
| 2610 | |
| 1044 | 2611 #endif // PRODUCT |
| 2612 | |
| 342 | 2613 // This note is for drainAllSATBBuffers and the code in between. |
| 2614 // In the future we could reuse a task to do this work during an | |
| 2615 // evacuation pause (since now tasks are not active and can be claimed | |
| 2616 // during an evacuation pause). This was a late change to the code and | |
| 2617 // is currently not being taken advantage of. | |
| 2618 | |
| 2619 class CMGlobalObjectClosure : public ObjectClosure { | |
| 2620 private: | |
| 2621 ConcurrentMark* _cm; | |
| 2622 | |
| 2623 public: | |
| 2624 void do_object(oop obj) { | |
| 2625 _cm->deal_with_reference(obj); | |
| 2626 } | |
| 2627 | |
| 2628 CMGlobalObjectClosure(ConcurrentMark* cm) : _cm(cm) { } | |
| 2629 }; | |
| 2630 | |
| 2631 void ConcurrentMark::deal_with_reference(oop obj) { | |
| 3771 | 2632 if (verbose_high()) { |
| 342 | 2633 gclog_or_tty->print_cr("[global] we're dealing with reference "PTR_FORMAT, |
| 2634 (void*) obj); | |
| 3771 | 2635 } |
| 342 | 2636 |
| 2637 HeapWord* objAddr = (HeapWord*) obj; | |
|
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|
2638 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
| 342 | 2639 if (_g1h->is_in_g1_reserved(objAddr)) { |
| 3771 | 2640 assert(obj != NULL, "null check is implicit"); |
| 2641 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
| 2642 // Only get the containing region if the object is not marked on the | |
| 2643 // bitmap (otherwise, it's a waste of time since we won't do | |
| 2644 // anything with it). | |
| 2645 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
| 2646 if (!hr->obj_allocated_since_next_marking(obj)) { | |
| 2647 if (verbose_high()) { | |
| 2648 gclog_or_tty->print_cr("[global] "PTR_FORMAT" is not considered " | |
| 2649 "marked", (void*) obj); | |
| 2650 } | |
| 2651 | |
| 2652 // we need to mark it first | |
| 2653 if (_nextMarkBitMap->parMark(objAddr)) { | |
| 2654 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 2655 // CAS done in parMark(objAddr) above | |
| 2656 HeapWord* finger = _finger; | |
| 2657 if (objAddr < finger) { | |
| 2658 if (verbose_high()) { | |
| 2659 gclog_or_tty->print_cr("[global] below the global finger " | |
| 2660 "("PTR_FORMAT"), pushing it", finger); | |
| 2661 } | |
| 2662 if (!mark_stack_push(obj)) { | |
| 2663 if (verbose_low()) { | |
| 2664 gclog_or_tty->print_cr("[global] global stack overflow during " | |
| 2665 "deal_with_reference"); | |
| 2666 } | |
| 2667 } | |
| 342 | 2668 } |
| 2669 } | |
| 2670 } | |
| 2671 } | |
| 2672 } | |
| 2673 } | |
| 2674 | |
| 2675 void ConcurrentMark::drainAllSATBBuffers() { | |
|
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|
2676 guarantee(false, "drainAllSATBBuffers(): don't call this any more"); |
|
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|
2677 |
| 342 | 2678 CMGlobalObjectClosure oc(this); |
| 2679 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 2680 satb_mq_set.set_closure(&oc); | |
| 2681 | |
| 2682 while (satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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2683 if (verbose_medium()) { |
| 342 | 2684 gclog_or_tty->print_cr("[global] processed an SATB buffer"); |
|
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|
2685 } |
| 342 | 2686 } |
| 2687 | |
| 2688 // no need to check whether we should do this, as this is only | |
| 2689 // called during an evacuation pause | |
| 2690 satb_mq_set.iterate_closure_all_threads(); | |
| 2691 | |
| 2692 satb_mq_set.set_closure(NULL); | |
|
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2693 assert(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2694 } |
| 2695 | |
| 2696 void ConcurrentMark::clear(oop p) { | |
| 2697 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 2698 HeapWord* addr = (HeapWord*)p; | |
| 2699 assert(addr >= _nextMarkBitMap->startWord() || | |
| 2700 addr < _nextMarkBitMap->endWord(), "in a region"); | |
| 2701 | |
| 2702 _nextMarkBitMap->clear(addr); | |
| 2703 } | |
| 2704 | |
|
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|
2705 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 2706 // Note we are overriding the read-only view of the prev map here, via |
| 2707 // the cast. | |
| 2708 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
|
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|
2709 } |
|
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|
2710 |
|
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|
2711 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 2712 _nextMarkBitMap->clearRange(mr); |
| 2713 } | |
| 2714 | |
|
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|
2715 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
|
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2716 clearRangePrevBitmap(mr); |
|
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|
2717 clearRangeNextBitmap(mr); |
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|
2718 } |
|
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|
2719 |
| 342 | 2720 HeapRegion* |
| 2721 ConcurrentMark::claim_region(int task_num) { | |
| 2722 // "checkpoint" the finger | |
| 2723 HeapWord* finger = _finger; | |
| 2724 | |
| 2725 // _heap_end will not change underneath our feet; it only changes at | |
| 2726 // yield points. | |
| 2727 while (finger < _heap_end) { | |
|
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2728 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 2729 |
| 3771 | 2730 // Note on how this code handles humongous regions. In the |
| 2731 // normal case the finger will reach the start of a "starts | |
| 2732 // humongous" (SH) region. Its end will either be the end of the | |
| 2733 // last "continues humongous" (CH) region in the sequence, or the | |
| 2734 // standard end of the SH region (if the SH is the only region in | |
| 2735 // the sequence). That way claim_region() will skip over the CH | |
| 2736 // regions. However, there is a subtle race between a CM thread | |
| 2737 // executing this method and a mutator thread doing a humongous | |
| 2738 // object allocation. The two are not mutually exclusive as the CM | |
| 2739 // thread does not need to hold the Heap_lock when it gets | |
| 2740 // here. So there is a chance that claim_region() will come across | |
| 2741 // a free region that's in the progress of becoming a SH or a CH | |
| 2742 // region. In the former case, it will either | |
| 2743 // a) Miss the update to the region's end, in which case it will | |
| 2744 // visit every subsequent CH region, will find their bitmaps | |
| 2745 // empty, and do nothing, or | |
| 2746 // b) Will observe the update of the region's end (in which case | |
| 2747 // it will skip the subsequent CH regions). | |
| 2748 // If it comes across a region that suddenly becomes CH, the | |
| 2749 // scenario will be similar to b). So, the race between | |
| 2750 // claim_region() and a humongous object allocation might force us | |
| 2751 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 2752 // iterations) but it should not introduce and correctness issues. | |
| 2753 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
| 342 | 2754 HeapWord* bottom = curr_region->bottom(); |
| 2755 HeapWord* end = curr_region->end(); | |
| 2756 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 2757 | |
| 3771 | 2758 if (verbose_low()) { |
| 342 | 2759 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
| 2760 "["PTR_FORMAT", "PTR_FORMAT"), " | |
| 2761 "limit = "PTR_FORMAT, | |
| 2762 task_num, curr_region, bottom, end, limit); | |
| 3771 | 2763 } |
| 2764 | |
| 2765 // Is the gap between reading the finger and doing the CAS too long? | |
| 2766 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 342 | 2767 if (res == finger) { |
| 2768 // we succeeded | |
| 2769 | |
| 2770 // notice that _finger == end cannot be guaranteed here since, | |
| 2771 // someone else might have moved the finger even further | |
|
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2772 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 2773 |
|
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2774 if (verbose_low()) { |
| 342 | 2775 gclog_or_tty->print_cr("[%d] we were successful with region = " |
| 2776 PTR_FORMAT, task_num, curr_region); | |
|
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|
2777 } |
| 342 | 2778 |
| 2779 if (limit > bottom) { | |
|
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2780 if (verbose_low()) { |
| 342 | 2781 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
| 2782 "returning it ", task_num, curr_region); | |
|
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|
2783 } |
| 342 | 2784 return curr_region; |
| 2785 } else { | |
|
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2786 assert(limit == bottom, |
|
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|
2787 "the region limit should be at bottom"); |
|
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|
2788 if (verbose_low()) { |
| 342 | 2789 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
| 2790 "returning NULL", task_num, curr_region); | |
|
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|
2791 } |
| 342 | 2792 // we return NULL and the caller should try calling |
| 2793 // claim_region() again. | |
| 2794 return NULL; | |
| 2795 } | |
| 2796 } else { | |
|
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2797 assert(_finger > finger, "the finger should have moved forward"); |
|
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|
2798 if (verbose_low()) { |
| 342 | 2799 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
| 2800 "global finger = "PTR_FORMAT", " | |
| 2801 "our finger = "PTR_FORMAT, | |
| 2802 task_num, _finger, finger); | |
|
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|
2803 } |
| 342 | 2804 |
| 2805 // read it again | |
| 2806 finger = _finger; | |
| 2807 } | |
| 2808 } | |
| 2809 | |
| 2810 return NULL; | |
| 2811 } | |
| 2812 | |
|
1835
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|
2813 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
|
4787
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|
2814 guarantee(false, "invalidate_aborted_regions_in_cset(): " |
|
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|
2815 "don't call this any more"); |
|
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|
2816 |
|
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|
2817 bool result = false; |
|
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|
2818 for (int i = 0; i < (int)_max_task_num; ++i) { |
|
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|
2819 CMTask* the_task = _tasks[i]; |
|
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|
2820 MemRegion mr = the_task->aborted_region(); |
|
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|
2821 if (mr.start() != NULL) { |
|
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|
2822 assert(mr.end() != NULL, "invariant"); |
|
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|
2823 assert(mr.word_size() > 0, "invariant"); |
|
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|
2824 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
|
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|
2825 assert(hr != NULL, "invariant"); |
|
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|
2826 if (hr->in_collection_set()) { |
|
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|
2827 // The region points into the collection set |
|
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|
2828 the_task->set_aborted_region(MemRegion()); |
|
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|
2829 result = true; |
|
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|
2830 } |
|
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|
2831 } |
|
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|
2832 } |
|
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|
2833 return result; |
|
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|
2834 } |
|
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|
2835 |
|
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|
2836 bool ConcurrentMark::has_aborted_regions() { |
|
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|
2837 for (int i = 0; i < (int)_max_task_num; ++i) { |
|
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|
2838 CMTask* the_task = _tasks[i]; |
|
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|
2839 MemRegion mr = the_task->aborted_region(); |
|
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|
2840 if (mr.start() != NULL) { |
|
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|
2841 assert(mr.end() != NULL, "invariant"); |
|
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|
2842 assert(mr.word_size() > 0, "invariant"); |
|
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|
2843 return true; |
|
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|
2844 } |
|
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|
2845 } |
|
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|
2846 return false; |
|
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|
2847 } |
|
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|
2848 |
| 342 | 2849 void ConcurrentMark::oops_do(OopClosure* cl) { |
|
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|
2850 if (_markStack.size() > 0 && verbose_low()) { |
| 342 | 2851 gclog_or_tty->print_cr("[global] scanning the global marking stack, " |
| 2852 "size = %d", _markStack.size()); | |
|
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|
2853 } |
| 342 | 2854 // we first iterate over the contents of the mark stack... |
| 2855 _markStack.oops_do(cl); | |
| 2856 | |
| 2857 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 2858 OopTaskQueue* queue = _task_queues->queue((int)i); | |
| 2859 | |
|
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|
2860 if (queue->size() > 0 && verbose_low()) { |
| 342 | 2861 gclog_or_tty->print_cr("[global] scanning task queue of task %d, " |
| 2862 "size = %d", i, queue->size()); | |
|
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|
2863 } |
| 342 | 2864 |
| 2865 // ...then over the contents of the all the task queues. | |
| 2866 queue->oops_do(cl); | |
| 2867 } | |
|
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|
2868 } |
|
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|
2869 |
|
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|
2870 #ifndef PRODUCT |
|
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|
2871 enum VerifyNoCSetOopsPhase { |
|
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|
2872 VerifyNoCSetOopsStack, |
|
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|
2873 VerifyNoCSetOopsQueues, |
|
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|
2874 VerifyNoCSetOopsSATBCompleted, |
|
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|
2875 VerifyNoCSetOopsSATBThread |
|
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|
2876 }; |
|
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|
2877 |
|
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|
2878 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
|
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|
2879 private: |
|
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|
2880 G1CollectedHeap* _g1h; |
|
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|
2881 VerifyNoCSetOopsPhase _phase; |
|
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|
2882 int _info; |
|
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|
2883 |
|
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|
2884 const char* phase_str() { |
|
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|
2885 switch (_phase) { |
|
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|
2886 case VerifyNoCSetOopsStack: return "Stack"; |
|
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|
2887 case VerifyNoCSetOopsQueues: return "Queue"; |
|
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|
2888 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
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|
2889 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
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|
2890 default: ShouldNotReachHere(); |
|
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|
2891 } |
|
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|
2892 return NULL; |
|
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|
2893 } |
|
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|
2894 |
|
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|
2895 void do_object_work(oop obj) { |
|
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|
2896 guarantee(!_g1h->obj_in_cs(obj), |
|
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|
2897 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
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|
2898 (void*) obj, phase_str(), _info)); |
|
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|
2899 } |
|
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|
2900 |
|
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|
2901 public: |
|
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|
2902 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
|
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|
2903 |
|
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|
2904 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
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|
2905 _phase = phase; |
|
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|
2906 _info = info; |
|
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|
2907 } |
|
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|
2908 |
|
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|
2909 virtual void do_oop(oop* p) { |
|
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|
2910 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
2911 do_object_work(obj); |
|
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|
2912 } |
|
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|
2913 |
|
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|
2914 virtual void do_oop(narrowOop* p) { |
|
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|
2915 // We should not come across narrow oops while scanning marking |
|
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|
2916 // stacks and SATB buffers. |
|
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|
2917 ShouldNotReachHere(); |
|
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|
2918 } |
|
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|
2919 |
|
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|
2920 virtual void do_object(oop obj) { |
|
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|
2921 do_object_work(obj); |
|
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|
2922 } |
|
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|
2923 }; |
|
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|
2924 |
|
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|
2925 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
2ace1c4ee8da
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|
2926 bool verify_enqueued_buffers, |
|
2ace1c4ee8da
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|
2927 bool verify_thread_buffers, |
|
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|
2928 bool verify_fingers) { |
|
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|
2929 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
|
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|
2930 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
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|
2931 return; |
| 342 | 2932 } |
|
1835
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|
2933 |
|
4787
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|
2934 VerifyNoCSetOopsClosure cl; |
|
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|
2935 |
|
2ace1c4ee8da
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|
2936 if (verify_stacks) { |
|
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|
2937 // Verify entries on the global mark stack |
|
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|
2938 cl.set_phase(VerifyNoCSetOopsStack); |
|
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|
2939 _markStack.oops_do(&cl); |
|
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|
2940 |
|
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diff
changeset
|
2941 // Verify entries on the task queues |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2942 for (int i = 0; i < (int) _max_task_num; i += 1) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
2943 cl.set_phase(VerifyNoCSetOopsQueues, i); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2944 OopTaskQueue* queue = _task_queues->queue(i); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2945 queue->oops_do(&cl); |
|
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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|
2946 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2947 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2948 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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changeset
|
2949 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2950 |
|
2ace1c4ee8da
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changeset
|
2951 // Verify entries on the enqueued SATB buffers |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2952 if (verify_enqueued_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2953 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
2ace1c4ee8da
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|
2954 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
2ace1c4ee8da
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|
2955 } |
|
2ace1c4ee8da
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|
2956 |
|
2ace1c4ee8da
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changeset
|
2957 // Verify entries on the per-thread SATB buffers |
|
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|
2958 if (verify_thread_buffers) { |
|
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|
2959 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
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|
2960 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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|
2961 } |
|
4805b9f4779e
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johnc
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diff
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|
2962 |
|
4787
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|
2963 if (verify_fingers) { |
|
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|
2964 // Verify the global finger |
|
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|
2965 HeapWord* global_finger = finger(); |
|
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|
2966 if (global_finger != NULL && global_finger < _heap_end) { |
|
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|
2967 // The global finger always points to a heap region boundary. We |
|
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|
2968 // use heap_region_containing_raw() to get the containing region |
|
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|
2969 // given that the global finger could be pointing to a free region |
|
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|
2970 // which subsequently becomes continues humongous. If that |
|
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|
2971 // happens, heap_region_containing() will return the bottom of the |
|
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|
2972 // corresponding starts humongous region and the check below will |
|
2ace1c4ee8da
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|
2973 // not hold any more. |
|
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|
2974 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
|
2ace1c4ee8da
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|
2975 guarantee(global_finger == global_hr->bottom(), |
|
2ace1c4ee8da
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|
2976 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
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|
2977 global_finger, HR_FORMAT_PARAMS(global_hr))); |
|
2ace1c4ee8da
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|
2978 } |
|
2ace1c4ee8da
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changeset
|
2979 |
|
2ace1c4ee8da
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|
2980 // Verify the task fingers |
|
2ace1c4ee8da
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|
2981 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
2ace1c4ee8da
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|
2982 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
|
2ace1c4ee8da
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|
2983 CMTask* task = _tasks[i]; |
|
2ace1c4ee8da
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|
2984 HeapWord* task_finger = task->finger(); |
|
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|
2985 if (task_finger != NULL && task_finger < _heap_end) { |
|
2ace1c4ee8da
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parents:
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|
2986 // See above note on the global finger verification. |
|
2ace1c4ee8da
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|
2987 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
|
2ace1c4ee8da
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|
2988 guarantee(task_finger == task_hr->bottom() || |
|
2ace1c4ee8da
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|
2989 !task_hr->in_collection_set(), |
|
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|
2990 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
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|
2991 task_finger, HR_FORMAT_PARAMS(task_hr))); |
|
2ace1c4ee8da
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|
2992 } |
|
2ace1c4ee8da
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|
2993 } |
|
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|
2994 } |
| 342 | 2995 } |
|
4787
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|
2996 #endif // PRODUCT |
| 342 | 2997 |
|
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
|
2998 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
| 342 | 2999 _markStack.setEmpty(); |
| 3000 _markStack.clear_overflow(); | |
| 3001 _regionStack.setEmpty(); | |
| 3002 _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
|
3003 if (clear_overflow) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
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|
3004 clear_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
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|
3005 } else { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3006 assert(has_overflown(), "pre-condition"); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
3007 } |
| 342 | 3008 _finger = _heap_start; |
| 3009 | |
| 3010 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3011 OopTaskQueue* queue = _task_queues->queue(i); | |
| 3012 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
|
3013 // 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
|
3014 _tasks[i]->clear_aborted_region(); |
| 342 | 3015 } |
| 3016 } | |
| 3017 | |
| 3018 void ConcurrentMark::print_stats() { | |
| 3019 if (verbose_stats()) { | |
| 3020 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3021 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3022 _tasks[i]->print_stats(); | |
| 3023 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3024 } | |
| 3025 } | |
| 3026 } | |
| 3027 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3028 // Closures used by ConcurrentMark::complete_marking_in_collection_set(). |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3029 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
changeset
|
3030 class CSetMarkOopClosure: public OopClosure { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3031 friend class CSetMarkBitMapClosure; |
| 342 | 3032 |
| 3033 G1CollectedHeap* _g1h; | |
| 3034 CMBitMap* _bm; | |
| 3035 ConcurrentMark* _cm; | |
| 3036 oop* _ms; | |
| 3037 jint* _array_ind_stack; | |
| 3038 int _ms_size; | |
| 3039 int _ms_ind; | |
| 3040 int _array_increment; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
3041 uint _worker_id; |
| 342 | 3042 |
| 3043 bool push(oop obj, int arr_ind = 0) { | |
| 3044 if (_ms_ind == _ms_size) { | |
| 3045 gclog_or_tty->print_cr("Mark stack is full."); | |
| 3046 return false; | |
| 3047 } | |
| 3048 _ms[_ms_ind] = obj; | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3049 if (obj->is_objArray()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
3050 _array_ind_stack[_ms_ind] = arr_ind; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
3051 } |
| 342 | 3052 _ms_ind++; |
| 3053 return true; | |
| 3054 } | |
| 3055 | |
| 3056 oop pop() { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3057 if (_ms_ind == 0) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3058 return NULL; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3059 } else { |
| 342 | 3060 _ms_ind--; |
| 3061 return _ms[_ms_ind]; | |
| 3062 } | |
| 3063 } | |
| 3064 | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3065 template <class T> bool drain() { |
| 342 | 3066 while (_ms_ind > 0) { |
| 3067 oop obj = pop(); | |
| 3068 assert(obj != NULL, "Since index was non-zero."); | |
| 3069 if (obj->is_objArray()) { | |
| 3070 jint arr_ind = _array_ind_stack[_ms_ind]; | |
| 3071 objArrayOop aobj = objArrayOop(obj); | |
| 3072 jint len = aobj->length(); | |
| 3073 jint next_arr_ind = arr_ind + _array_increment; | |
| 3074 if (next_arr_ind < len) { | |
| 3075 push(obj, next_arr_ind); | |
| 3076 } | |
| 3077 // Now process this portion of this one. | |
| 3078 int lim = MIN2(next_arr_ind, len); | |
| 3079 for (int j = arr_ind; j < lim; j++) { | |
|
912
308762b2bf14
6872000: G1: compilation fails on linux/older gcc
apetrusenko
parents:
866
diff
changeset
|
3080 do_oop(aobj->objArrayOopDesc::obj_at_addr<T>(j)); |
| 342 | 3081 } |
| 3082 } else { | |
| 3083 obj->oop_iterate(this); | |
| 3084 } | |
| 3085 if (abort()) return false; | |
| 3086 } | |
| 3087 return true; | |
| 3088 } | |
| 3089 | |
| 3090 public: | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
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changeset
|
3091 CSetMarkOopClosure(ConcurrentMark* cm, int ms_size, uint worker_id) : |
| 342 | 3092 _g1h(G1CollectedHeap::heap()), |
| 3093 _cm(cm), | |
| 3094 _bm(cm->nextMarkBitMap()), | |
| 3095 _ms_size(ms_size), _ms_ind(0), | |
| 3096 _ms(NEW_C_HEAP_ARRAY(oop, ms_size)), | |
| 3097 _array_ind_stack(NEW_C_HEAP_ARRAY(jint, ms_size)), | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3098 _array_increment(MAX2(ms_size/8, 16)), |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
3099 _worker_id(worker_id) { } |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
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|
3100 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3101 ~CSetMarkOopClosure() { |
| 342 | 3102 FREE_C_HEAP_ARRAY(oop, _ms); |
| 3103 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
| 3104 } | |
| 3105 | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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831
diff
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|
3106 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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831
diff
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|
3107 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
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|
3108 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3109 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
|
3110 T heap_oop = oopDesc::load_heap_oop(p); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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831
diff
changeset
|
3111 if (oopDesc::is_null(heap_oop)) return; |
|
df6caf649ff7
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ysr
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831
diff
changeset
|
3112 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 342 | 3113 if (obj->is_forwarded()) { |
| 3114 // If the object has already been forwarded, we have to make sure | |
| 3115 // that it's marked. So follow the forwarding pointer. Note that | |
| 3116 // this does the right thing for self-forwarding pointers in the | |
| 3117 // evacuation failure case. | |
| 3118 obj = obj->forwardee(); | |
| 3119 } | |
| 3120 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
| 3121 if (hr != NULL) { | |
| 3122 if (hr->in_collection_set()) { | |
| 3123 if (_g1h->is_obj_ill(obj)) { | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
3124 if (_bm->parMark((HeapWord*)obj)) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3125 if (!push(obj)) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3126 gclog_or_tty->print_cr("Setting abort in CSetMarkOopClosure because push failed."); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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diff
changeset
|
3127 set_abort(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3128 } |
| 342 | 3129 } |
| 3130 } | |
| 3131 } else { | |
| 3132 // Outside the collection set; we need to gray it | |
| 3133 _cm->deal_with_reference(obj); | |
| 3134 } | |
| 3135 } | |
| 3136 } | |
| 3137 }; | |
| 3138 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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3139 class CSetMarkBitMapClosure: public BitMapClosure { |
|
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3140 G1CollectedHeap* _g1h; |
|
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|
3141 CMBitMap* _bitMap; |
|
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3142 ConcurrentMark* _cm; |
|
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3143 CSetMarkOopClosure _oop_cl; |
|
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3144 uint _worker_id; |
|
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3145 |
| 342 | 3146 public: |
|
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3147 CSetMarkBitMapClosure(ConcurrentMark* cm, int ms_size, int worker_id) : |
| 342 | 3148 _g1h(G1CollectedHeap::heap()), |
| 3149 _bitMap(cm->nextMarkBitMap()), | |
|
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3150 _oop_cl(cm, ms_size, worker_id), |
|
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3151 _worker_id(worker_id) { } |
| 342 | 3152 |
| 3153 bool do_bit(size_t offset) { | |
| 3154 // convert offset into a HeapWord* | |
| 3155 HeapWord* addr = _bitMap->offsetToHeapWord(offset); | |
| 3156 assert(_bitMap->endWord() && addr < _bitMap->endWord(), | |
| 3157 "address out of range"); | |
| 3158 assert(_bitMap->isMarked(addr), "tautology"); | |
| 3159 oop obj = oop(addr); | |
| 3160 if (!obj->is_forwarded()) { | |
| 3161 if (!_oop_cl.push(obj)) return false; | |
|
845
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3162 if (UseCompressedOops) { |
|
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3163 if (!_oop_cl.drain<narrowOop>()) return false; |
|
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3164 } else { |
|
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|
3165 if (!_oop_cl.drain<oop>()) return false; |
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3166 } |
| 342 | 3167 } |
| 3168 // Otherwise... | |
| 3169 return true; | |
| 3170 } | |
| 3171 }; | |
| 3172 | |
|
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3173 class CompleteMarkingInCSetHRClosure: public HeapRegionClosure { |
|
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3174 CMBitMap* _bm; |
|
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3175 CSetMarkBitMapClosure _bit_cl; |
|
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3176 uint _worker_id; |
|
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3177 |
| 342 | 3178 enum SomePrivateConstants { |
| 3179 MSSize = 1000 | |
| 3180 }; | |
|
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3181 |
| 342 | 3182 public: |
|
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3183 CompleteMarkingInCSetHRClosure(ConcurrentMark* cm, int worker_id) : |
| 342 | 3184 _bm(cm->nextMarkBitMap()), |
|
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3185 _bit_cl(cm, MSSize, worker_id), |
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3186 _worker_id(worker_id) { } |
|
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3187 |
|
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|
3188 bool doHeapRegion(HeapRegion* hr) { |
|
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3189 if (hr->claimHeapRegion(HeapRegion::CompleteMarkCSetClaimValue)) { |
|
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|
3190 // The current worker has successfully claimed the region. |
|
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|
3191 if (!hr->evacuation_failed()) { |
|
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3192 MemRegion mr = MemRegion(hr->bottom(), hr->next_top_at_mark_start()); |
|
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3193 if (!mr.is_empty()) { |
|
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|
3194 bool done = false; |
|
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|
3195 while (!done) { |
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3196 done = _bm->iterate(&_bit_cl, mr); |
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|
3197 } |
| 342 | 3198 } |
| 3199 } | |
| 3200 } | |
| 3201 return false; | |
| 3202 } | |
| 3203 }; | |
| 3204 | |
|
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|
3205 class G1ParCompleteMarkInCSetTask: public AbstractGangTask { |
|
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3206 protected: |
|
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|
3207 G1CollectedHeap* _g1h; |
|
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|
3208 ConcurrentMark* _cm; |
|
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|
3209 |
|
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|
3210 public: |
|
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|
3211 G1ParCompleteMarkInCSetTask(G1CollectedHeap* g1h, |
|
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|
3212 ConcurrentMark* cm) : |
|
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3213 AbstractGangTask("Complete Mark in CSet"), |
|
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3214 _g1h(g1h), _cm(cm) { } |
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3215 |
|
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|
3216 void work(uint worker_id) { |
|
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3217 CompleteMarkingInCSetHRClosure cmplt(_cm, worker_id); |
|
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3218 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id); |
|
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3219 _g1h->collection_set_iterate_from(hr, &cmplt); |
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3220 } |
|
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|
3221 }; |
|
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|
3222 |
| 342 | 3223 void ConcurrentMark::complete_marking_in_collection_set() { |
|
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|
3224 guarantee(false, "complete_marking_in_collection_set(): " |
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|
3225 "don't call this any more"); |
|
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3226 |
| 342 | 3227 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 3228 | |
| 3229 if (!g1h->mark_in_progress()) { | |
| 3230 g1h->g1_policy()->record_mark_closure_time(0.0); | |
| 3231 return; | |
| 3232 } | |
| 3233 | |
| 3234 double start = os::elapsedTime(); | |
|
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|
3235 G1ParCompleteMarkInCSetTask complete_mark_task(g1h, this); |
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3236 |
|
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|
3237 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
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3238 |
|
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|
3239 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 4711 | 3240 int n_workers = g1h->workers()->active_workers(); |
|
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3241 g1h->set_par_threads(n_workers); |
|
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|
3242 g1h->workers()->run_task(&complete_mark_task); |
|
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|
3243 g1h->set_par_threads(0); |
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|
3244 } else { |
|
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|
3245 complete_mark_task.work(0); |
| 342 | 3246 } |
|
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|
3247 |
|
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|
3248 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::CompleteMarkCSetClaimValue), "sanity"); |
|
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3249 |
|
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|
3250 // Reset the claim values in the regions in the collection set. |
|
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|
3251 g1h->reset_cset_heap_region_claim_values(); |
|
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3252 |
|
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|
3253 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
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|
3254 |
| 342 | 3255 double end_time = os::elapsedTime(); |
| 3256 double elapsed_time_ms = (end_time - start) * 1000.0; | |
| 3257 g1h->g1_policy()->record_mark_closure_time(elapsed_time_ms); | |
| 3258 } | |
| 3259 | |
| 3260 // The next two methods deal with the following optimisation. Some | |
| 3261 // objects are gray by being marked and located above the finger. If | |
| 3262 // they are copied, during an evacuation pause, below the finger then | |
| 3263 // the need to be pushed on the stack. The observation is that, if | |
| 3264 // there are no regions in the collection set located above the | |
| 3265 // finger, then the above cannot happen, hence we do not need to | |
| 3266 // explicitly gray any objects when copying them to below the | |
| 3267 // finger. The global stack will be scanned to ensure that, if it | |
| 3268 // points to objects being copied, it will update their | |
| 3269 // location. There is a tricky situation with the gray objects in | |
| 3270 // region stack that are being coped, however. See the comment in | |
| 3271 // newCSet(). | |
| 3272 | |
| 3273 void ConcurrentMark::newCSet() { | |
|
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|
3274 guarantee(false, "newCSet(): don't call this any more"); |
|
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|
3275 |
|
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|
3276 if (!concurrent_marking_in_progress()) { |
| 342 | 3277 // nothing to do if marking is not in progress |
| 3278 return; | |
|
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|
3279 } |
| 342 | 3280 |
| 3281 // find what the lowest finger is among the global and local fingers | |
| 3282 _min_finger = _finger; | |
| 3283 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3284 CMTask* task = _tasks[i]; | |
| 3285 HeapWord* task_finger = task->finger(); | |
|
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|
3286 if (task_finger != NULL && task_finger < _min_finger) { |
| 342 | 3287 _min_finger = task_finger; |
|
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|
3288 } |
| 342 | 3289 } |
| 3290 | |
| 3291 _should_gray_objects = false; | |
| 3292 | |
| 3293 // This fixes a very subtle and fustrating bug. It might be the case | |
| 3294 // that, during en evacuation pause, heap regions that contain | |
| 3295 // objects that are gray (by being in regions contained in the | |
| 3296 // region stack) are included in the collection set. Since such gray | |
| 3297 // objects will be moved, and because it's not easy to redirect | |
| 3298 // region stack entries to point to a new location (because objects | |
| 3299 // in one region might be scattered to multiple regions after they | |
| 3300 // are copied), one option is to ensure that all marked objects | |
| 3301 // copied during a pause are pushed on the stack. Notice, however, | |
| 3302 // that this problem can only happen when the region stack is not | |
| 3303 // empty during an evacuation pause. So, we make the fix a bit less | |
| 3304 // conservative and ensure that regions are pushed on the stack, | |
| 3305 // irrespective whether all collection set regions are below the | |
| 3306 // finger, if the region stack is not empty. This is expected to be | |
| 3307 // a rare case, so I don't think it's necessary to be smarted about it. | |
|
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|
3308 if (!region_stack_empty() || has_aborted_regions()) { |
| 342 | 3309 _should_gray_objects = true; |
|
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|
3310 } |
| 342 | 3311 } |
| 3312 | |
| 3313 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
|
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|
3314 guarantee(false, "registerCSetRegion(): don't call this any more"); |
|
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3315 |
|
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|
3316 if (!concurrent_marking_in_progress()) return; |
| 342 | 3317 |
| 3318 HeapWord* region_end = hr->end(); | |
|
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|
3319 if (region_end > _min_finger) { |
| 342 | 3320 _should_gray_objects = true; |
|
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|
3321 } |
| 342 | 3322 } |
| 3323 | |
|
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|
3324 // Resets the region fields of active CMTasks whose values point |
|
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|
3325 // into the collection set. |
|
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|
3326 void ConcurrentMark::reset_active_task_region_fields_in_cset() { |
|
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|
3327 guarantee(false, "reset_active_task_region_fields_in_cset(): " |
|
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|
3328 "don't call this any more"); |
|
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|
3329 |
|
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|
3330 assert(SafepointSynchronize::is_at_safepoint(), "should be in STW"); |
|
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|
3331 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
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|
3332 |
|
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|
3333 for (int i = 0; i < (int)parallel_marking_threads(); i += 1) { |
|
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|
3334 CMTask* task = _tasks[i]; |
|
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3335 HeapWord* task_finger = task->finger(); |
|
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|
3336 if (task_finger != NULL) { |
|
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3337 assert(_g1h->is_in_g1_reserved(task_finger), "not in heap"); |
|
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3338 HeapRegion* finger_region = _g1h->heap_region_containing(task_finger); |
|
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|
3339 if (finger_region->in_collection_set()) { |
|
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3340 // The task's current region is in the collection set. |
|
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3341 // This region will be evacuated in the current GC and |
|
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3342 // the region fields in the task will be stale. |
|
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3343 task->giveup_current_region(); |
|
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3344 } |
|
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|
3345 } |
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3346 } |
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3347 } |
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|
3348 |
| 342 | 3349 // abandon current marking iteration due to a Full GC |
| 3350 void ConcurrentMark::abort() { | |
| 3351 // Clear all marks to force marking thread to do nothing | |
| 3352 _nextMarkBitMap->clearAll(); | |
| 3353 // Empty mark stack | |
| 3354 clear_marking_state(); | |
|
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3355 for (int i = 0; i < (int)_max_task_num; ++i) { |
| 342 | 3356 _tasks[i]->clear_region_fields(); |
|
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3357 } |
| 342 | 3358 _has_aborted = true; |
| 3359 | |
| 3360 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3361 satb_mq_set.abandon_partial_marking(); | |
|
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3362 // This can be called either during or outside marking, we'll read |
|
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3363 // the expected_active value from the SATB queue set. |
|
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3364 satb_mq_set.set_active_all_threads( |
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3365 false, /* new active value */ |
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|
3366 satb_mq_set.is_active() /* expected_active */); |
| 342 | 3367 } |
| 3368 | |
| 3369 static void print_ms_time_info(const char* prefix, const char* name, | |
| 3370 NumberSeq& ns) { | |
| 3371 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3372 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3373 if (ns.num() > 0) { | |
| 3374 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3375 prefix, ns.sd(), ns.maximum()); | |
| 3376 } | |
| 3377 } | |
| 3378 | |
| 3379 void ConcurrentMark::print_summary_info() { | |
| 3380 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3381 print_ms_time_info(" ", "init marks", _init_times); | |
| 3382 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3383 { | |
| 3384 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3385 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3386 | |
| 3387 } | |
| 3388 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3389 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3390 _total_counting_time, | |
| 3391 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3392 (double)_cleanup_times.num() | |
| 3393 : 0.0)); | |
| 3394 if (G1ScrubRemSets) { | |
| 3395 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3396 _total_rs_scrub_time, | |
| 3397 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3398 (double)_cleanup_times.num() | |
| 3399 : 0.0)); | |
| 3400 } | |
| 3401 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3402 (_init_times.sum() + _remark_times.sum() + | |
| 3403 _cleanup_times.sum())/1000.0); | |
| 3404 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
| 3405 "(%8.2f s marking, %8.2f s counting).", | |
| 3406 cmThread()->vtime_accum(), | |
| 3407 cmThread()->vtime_mark_accum(), | |
| 3408 cmThread()->vtime_count_accum()); | |
| 3409 } | |
| 3410 | |
| 1019 | 3411 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
| 3412 _parallel_workers->print_worker_threads_on(st); | |
| 3413 } | |
| 3414 | |
| 342 | 3415 // Closures |
| 3416 // XXX: there seems to be a lot of code duplication here; | |
| 3417 // should refactor and consolidate the shared code. | |
| 3418 | |
| 3419 // This closure is used to mark refs into the CMS generation in | |
| 3420 // the CMS bit map. Called at the first checkpoint. | |
| 3421 | |
| 3422 // We take a break if someone is trying to stop the world. | |
|
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|
3423 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 342 | 3424 if (should_yield()) { |
|
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|
3425 if (worker_id == 0) { |
| 342 | 3426 _g1h->g1_policy()->record_concurrent_pause(); |
|
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|
3427 } |
| 342 | 3428 cmThread()->yield(); |
|
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|
3429 if (worker_id == 0) { |
| 342 | 3430 _g1h->g1_policy()->record_concurrent_pause_end(); |
|
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|
3431 } |
| 342 | 3432 return true; |
| 3433 } else { | |
| 3434 return false; | |
| 3435 } | |
| 3436 } | |
| 3437 | |
| 3438 bool ConcurrentMark::should_yield() { | |
| 3439 return cmThread()->should_yield(); | |
| 3440 } | |
| 3441 | |
| 3442 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 3443 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 3444 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 3445 } | |
| 3446 | |
| 3447 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 3448 void* last) { | |
|
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|
3449 return containing_card_is_marked(start) && |
|
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|
3450 containing_card_is_marked(last); |
| 342 | 3451 } |
| 3452 | |
| 3453 #ifndef PRODUCT | |
| 3454 // for debugging purposes | |
| 3455 void ConcurrentMark::print_finger() { | |
| 3456 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
| 3457 _heap_start, _heap_end, _finger); | |
| 3458 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 3459 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
| 3460 } | |
| 3461 gclog_or_tty->print_cr(""); | |
| 3462 } | |
| 3463 #endif | |
| 3464 | |
| 3771 | 3465 void CMTask::scan_object(oop obj) { |
| 3466 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3467 | |
| 3468 if (_cm->verbose_high()) { | |
| 3469 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
| 3470 _task_id, (void*) obj); | |
| 3471 } | |
| 3472 | |
| 3473 size_t obj_size = obj->size(); | |
| 3474 _words_scanned += obj_size; | |
| 3475 | |
| 3476 obj->oop_iterate(_cm_oop_closure); | |
| 3477 statsOnly( ++_objs_scanned ); | |
| 3478 check_limits(); | |
| 3479 } | |
| 3480 | |
| 342 | 3481 // Closure for iteration over bitmaps |
| 3482 class CMBitMapClosure : public BitMapClosure { | |
| 3483 private: | |
| 3484 // the bitmap that is being iterated over | |
| 3485 CMBitMap* _nextMarkBitMap; | |
| 3486 ConcurrentMark* _cm; | |
| 3487 CMTask* _task; | |
| 3488 // true if we're scanning a heap region claimed by the task (so that | |
| 3489 // we move the finger along), false if we're not, i.e. currently when | |
| 3490 // scanning a heap region popped from the region stack (so that we | |
| 3491 // do not move the task finger along; it'd be a mistake if we did so). | |
| 3492 bool _scanning_heap_region; | |
| 3493 | |
| 3494 public: | |
| 3495 CMBitMapClosure(CMTask *task, | |
| 3496 ConcurrentMark* cm, | |
| 3497 CMBitMap* nextMarkBitMap) | |
| 3498 : _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } | |
| 3499 | |
| 3500 void set_scanning_heap_region(bool scanning_heap_region) { | |
| 3501 _scanning_heap_region = scanning_heap_region; | |
| 3502 } | |
| 3503 | |
| 3504 bool do_bit(size_t offset) { | |
| 3505 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
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|
3506 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
|
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|
3507 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3508 |
| 3509 if (_scanning_heap_region) { | |
| 3510 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
|
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|
3511 assert(addr >= _task->finger(), "invariant"); |
| 342 | 3512 // We move that task's local finger along. |
| 3513 _task->move_finger_to(addr); | |
| 3514 } else { | |
| 3515 // We move the task's region finger along. | |
| 3516 _task->move_region_finger_to(addr); | |
| 3517 } | |
| 3518 | |
| 3519 _task->scan_object(oop(addr)); | |
| 3520 // we only partially drain the local queue and global stack | |
| 3521 _task->drain_local_queue(true); | |
| 3522 _task->drain_global_stack(true); | |
| 3523 | |
| 3524 // if the has_aborted flag has been raised, we need to bail out of | |
| 3525 // the iteration | |
| 3526 return !_task->has_aborted(); | |
| 3527 } | |
| 3528 }; | |
| 3529 | |
| 3530 // Closure for iterating over objects, currently only used for | |
| 3531 // processing SATB buffers. | |
| 3532 class CMObjectClosure : public ObjectClosure { | |
| 3533 private: | |
| 3534 CMTask* _task; | |
| 3535 | |
| 3536 public: | |
| 3537 void do_object(oop obj) { | |
| 3538 _task->deal_with_reference(obj); | |
| 3539 } | |
| 3540 | |
| 3541 CMObjectClosure(CMTask* task) : _task(task) { } | |
| 3542 }; | |
| 3543 | |
| 3771 | 3544 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 3545 ConcurrentMark* cm, | |
| 3546 CMTask* task) | |
| 3547 : _g1h(g1h), _cm(cm), _task(task) { | |
| 3548 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 3549 | |
| 3550 if (G1UseConcMarkReferenceProcessing) { | |
|
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|
3551 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 3552 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 3553 } |
| 3771 | 3554 } |
| 342 | 3555 |
| 3556 void CMTask::setup_for_region(HeapRegion* hr) { | |
|
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|
3557 // Separated the asserts so that we know which one fires. |
|
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|
3558 assert(hr != NULL, |
|
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|
3559 "claim_region() should have filtered out continues humongous regions"); |
|
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|
3560 assert(!hr->continuesHumongous(), |
|
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|
3561 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 3562 |
|
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|
3563 if (_cm->verbose_low()) { |
| 342 | 3564 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
| 3565 _task_id, hr); | |
|
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|
3566 } |
| 342 | 3567 |
| 3568 _curr_region = hr; | |
| 3569 _finger = hr->bottom(); | |
| 3570 update_region_limit(); | |
| 3571 } | |
| 3572 | |
| 3573 void CMTask::update_region_limit() { | |
| 3574 HeapRegion* hr = _curr_region; | |
| 3575 HeapWord* bottom = hr->bottom(); | |
| 3576 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 3577 | |
| 3578 if (limit == bottom) { | |
|
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|
3579 if (_cm->verbose_low()) { |
| 342 | 3580 gclog_or_tty->print_cr("[%d] found an empty region " |
| 3581 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 3582 _task_id, bottom, limit); | |
|
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|
3583 } |
| 342 | 3584 // The region was collected underneath our feet. |
| 3585 // We set the finger to bottom to ensure that the bitmap | |
| 3586 // iteration that will follow this will not do anything. | |
| 3587 // (this is not a condition that holds when we set the region up, | |
| 3588 // as the region is not supposed to be empty in the first place) | |
| 3589 _finger = bottom; | |
| 3590 } else if (limit >= _region_limit) { | |
|
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|
3591 assert(limit >= _finger, "peace of mind"); |
| 342 | 3592 } else { |
|
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|
3593 assert(limit < _region_limit, "only way to get here"); |
| 342 | 3594 // This can happen under some pretty unusual circumstances. An |
| 3595 // evacuation pause empties the region underneath our feet (NTAMS | |
| 3596 // at bottom). We then do some allocation in the region (NTAMS | |
| 3597 // stays at bottom), followed by the region being used as a GC | |
| 3598 // alloc region (NTAMS will move to top() and the objects | |
| 3599 // originally below it will be grayed). All objects now marked in | |
| 3600 // the region are explicitly grayed, if below the global finger, | |
| 3601 // and we do not need in fact to scan anything else. So, we simply | |
| 3602 // set _finger to be limit to ensure that the bitmap iteration | |
| 3603 // doesn't do anything. | |
| 3604 _finger = limit; | |
| 3605 } | |
| 3606 | |
| 3607 _region_limit = limit; | |
| 3608 } | |
| 3609 | |
| 3610 void CMTask::giveup_current_region() { | |
|
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|
3611 assert(_curr_region != NULL, "invariant"); |
|
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|
3612 if (_cm->verbose_low()) { |
| 342 | 3613 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
| 3614 _task_id, _curr_region); | |
|
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|
3615 } |
| 342 | 3616 clear_region_fields(); |
| 3617 } | |
| 3618 | |
| 3619 void CMTask::clear_region_fields() { | |
| 3620 // Values for these three fields that indicate that we're not | |
| 3621 // holding on to a region. | |
| 3622 _curr_region = NULL; | |
| 3623 _finger = NULL; | |
| 3624 _region_limit = NULL; | |
| 3625 | |
| 3626 _region_finger = NULL; | |
| 3627 } | |
| 3628 | |
| 3771 | 3629 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 3630 if (cm_oop_closure == NULL) { | |
| 3631 assert(_cm_oop_closure != NULL, "invariant"); | |
| 3632 } else { | |
| 3633 assert(_cm_oop_closure == NULL, "invariant"); | |
| 3634 } | |
| 3635 _cm_oop_closure = cm_oop_closure; | |
| 3636 } | |
| 3637 | |
| 342 | 3638 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
|
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|
3639 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 3640 |
|
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|
3641 if (_cm->verbose_low()) { |
| 342 | 3642 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
|
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|
3643 } |
| 342 | 3644 |
| 3645 _nextMarkBitMap = nextMarkBitMap; | |
| 3646 clear_region_fields(); | |
|
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|
3647 assert(_aborted_region.is_empty(), "should have been cleared"); |
| 342 | 3648 |
| 3649 _calls = 0; | |
| 3650 _elapsed_time_ms = 0.0; | |
| 3651 _termination_time_ms = 0.0; | |
| 3652 _termination_start_time_ms = 0.0; | |
| 3653 | |
| 3654 #if _MARKING_STATS_ | |
| 3655 _local_pushes = 0; | |
| 3656 _local_pops = 0; | |
| 3657 _local_max_size = 0; | |
| 3658 _objs_scanned = 0; | |
| 3659 _global_pushes = 0; | |
| 3660 _global_pops = 0; | |
| 3661 _global_max_size = 0; | |
| 3662 _global_transfers_to = 0; | |
| 3663 _global_transfers_from = 0; | |
| 3664 _region_stack_pops = 0; | |
| 3665 _regions_claimed = 0; | |
| 3666 _objs_found_on_bitmap = 0; | |
| 3667 _satb_buffers_processed = 0; | |
| 3668 _steal_attempts = 0; | |
| 3669 _steals = 0; | |
| 3670 _aborted = 0; | |
| 3671 _aborted_overflow = 0; | |
| 3672 _aborted_cm_aborted = 0; | |
| 3673 _aborted_yield = 0; | |
| 3674 _aborted_timed_out = 0; | |
| 3675 _aborted_satb = 0; | |
| 3676 _aborted_termination = 0; | |
| 3677 #endif // _MARKING_STATS_ | |
| 3678 } | |
| 3679 | |
| 3680 bool CMTask::should_exit_termination() { | |
| 3681 regular_clock_call(); | |
| 3682 // This is called when we are in the termination protocol. We should | |
| 3683 // quit if, for some reason, this task wants to abort or the global | |
| 3684 // stack is not empty (this means that we can get work from it). | |
| 3685 return !_cm->mark_stack_empty() || has_aborted(); | |
| 3686 } | |
| 3687 | |
| 3688 void CMTask::reached_limit() { | |
|
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3689 assert(_words_scanned >= _words_scanned_limit || |
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3690 _refs_reached >= _refs_reached_limit , |
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3691 "shouldn't have been called otherwise"); |
| 342 | 3692 regular_clock_call(); |
| 3693 } | |
| 3694 | |
| 3695 void CMTask::regular_clock_call() { | |
|
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3696 if (has_aborted()) return; |
| 342 | 3697 |
| 3698 // First, we need to recalculate the words scanned and refs reached | |
| 3699 // limits for the next clock call. | |
| 3700 recalculate_limits(); | |
| 3701 | |
| 3702 // During the regular clock call we do the following | |
| 3703 | |
| 3704 // (1) If an overflow has been flagged, then we abort. | |
| 3705 if (_cm->has_overflown()) { | |
| 3706 set_has_aborted(); | |
| 3707 return; | |
| 3708 } | |
| 3709 | |
| 3710 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 3711 // to check anything else. The other steps are only needed during | |
| 3712 // the concurrent marking phase. | |
|
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3713 if (!concurrent()) return; |
| 342 | 3714 |
| 3715 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 3716 if (_cm->has_aborted()) { | |
| 3717 set_has_aborted(); | |
| 3718 statsOnly( ++_aborted_cm_aborted ); | |
| 3719 return; | |
| 3720 } | |
| 3721 | |
| 3722 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 3723 | |
| 3724 // (3) If marking stats are enabled, then we update the step history. | |
| 3725 #if _MARKING_STATS_ | |
|
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3726 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 3727 ++_clock_due_to_scanning; |
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3728 } |
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3729 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 3730 ++_clock_due_to_marking; |
|
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3731 } |
| 342 | 3732 |
| 3733 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 3734 _interval_start_time_ms = curr_time_ms; | |
| 3735 _all_clock_intervals_ms.add(last_interval_ms); | |
| 3736 | |
| 3737 if (_cm->verbose_medium()) { | |
|
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3738 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
|
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3739 "scanned = %d%s, refs reached = %d%s", |
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3740 _task_id, last_interval_ms, |
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3741 _words_scanned, |
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3742 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3743 _refs_reached, |
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3744 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 3745 } |
| 3746 #endif // _MARKING_STATS_ | |
| 3747 | |
| 3748 // (4) We check whether we should yield. If we have to, then we abort. | |
| 3749 if (_cm->should_yield()) { | |
| 3750 // We should yield. To do this we abort the task. The caller is | |
| 3751 // responsible for yielding. | |
| 3752 set_has_aborted(); | |
| 3753 statsOnly( ++_aborted_yield ); | |
| 3754 return; | |
| 3755 } | |
| 3756 | |
| 3757 // (5) We check whether we've reached our time quota. If we have, | |
| 3758 // then we abort. | |
| 3759 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 3760 if (elapsed_time_ms > _time_target_ms) { | |
| 3761 set_has_aborted(); | |
|
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3762 _has_timed_out = true; |
| 342 | 3763 statsOnly( ++_aborted_timed_out ); |
| 3764 return; | |
| 3765 } | |
| 3766 | |
| 3767 // (6) Finally, we check whether there are enough completed STAB | |
| 3768 // buffers available for processing. If there are, we abort. | |
| 3769 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3770 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
|
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3771 if (_cm->verbose_low()) { |
| 342 | 3772 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
| 3773 _task_id); | |
|
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3774 } |
| 342 | 3775 // we do need to process SATB buffers, we'll abort and restart |
| 3776 // the marking task to do so | |
| 3777 set_has_aborted(); | |
| 3778 statsOnly( ++_aborted_satb ); | |
| 3779 return; | |
| 3780 } | |
| 3781 } | |
| 3782 | |
| 3783 void CMTask::recalculate_limits() { | |
| 3784 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 3785 _words_scanned_limit = _real_words_scanned_limit; | |
| 3786 | |
| 3787 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 3788 _refs_reached_limit = _real_refs_reached_limit; | |
| 3789 } | |
| 3790 | |
| 3791 void CMTask::decrease_limits() { | |
| 3792 // This is called when we believe that we're going to do an infrequent | |
| 3793 // operation which will increase the per byte scanned cost (i.e. move | |
| 3794 // entries to/from the global stack). It basically tries to decrease the | |
| 3795 // scanning limit so that the clock is called earlier. | |
| 3796 | |
|
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3797 if (_cm->verbose_medium()) { |
| 342 | 3798 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
|
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3799 } |
| 342 | 3800 |
| 3801 _words_scanned_limit = _real_words_scanned_limit - | |
| 3802 3 * words_scanned_period / 4; | |
| 3803 _refs_reached_limit = _real_refs_reached_limit - | |
| 3804 3 * refs_reached_period / 4; | |
| 3805 } | |
| 3806 | |
| 3807 void CMTask::move_entries_to_global_stack() { | |
| 3808 // local array where we'll store the entries that will be popped | |
| 3809 // from the local queue | |
| 3810 oop buffer[global_stack_transfer_size]; | |
| 3811 | |
| 3812 int n = 0; | |
| 3813 oop obj; | |
| 3814 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 3815 buffer[n] = obj; | |
| 3816 ++n; | |
| 3817 } | |
| 3818 | |
| 3819 if (n > 0) { | |
| 3820 // we popped at least one entry from the local queue | |
| 3821 | |
| 3822 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 3823 | |
| 3824 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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3825 if (_cm->verbose_low()) { |
|
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|
3826 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
|
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|
3827 _task_id); |
|
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|
3828 } |
| 342 | 3829 set_has_aborted(); |
| 3830 } else { | |
| 3831 // the transfer was successful | |
| 3832 | |
|
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|
3833 if (_cm->verbose_medium()) { |
| 342 | 3834 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
| 3835 _task_id, n); | |
|
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3836 } |
| 342 | 3837 statsOnly( int tmp_size = _cm->mark_stack_size(); |
|
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|
3838 if (tmp_size > _global_max_size) { |
| 342 | 3839 _global_max_size = tmp_size; |
|
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|
3840 } |
| 342 | 3841 _global_pushes += n ); |
| 3842 } | |
| 3843 } | |
| 3844 | |
| 3845 // this operation was quite expensive, so decrease the limits | |
| 3846 decrease_limits(); | |
| 3847 } | |
| 3848 | |
| 3849 void CMTask::get_entries_from_global_stack() { | |
| 3850 // local array where we'll store the entries that will be popped | |
| 3851 // from the global stack. | |
| 3852 oop buffer[global_stack_transfer_size]; | |
| 3853 int n; | |
| 3854 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
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3855 assert(n <= global_stack_transfer_size, |
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|
3856 "we should not pop more than the given limit"); |
| 342 | 3857 if (n > 0) { |
| 3858 // yes, we did actually pop at least one entry | |
| 3859 | |
| 3860 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
|
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|
3861 if (_cm->verbose_medium()) { |
| 342 | 3862 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
| 3863 _task_id, n); | |
|
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|
3864 } |
| 342 | 3865 for (int i = 0; i < n; ++i) { |
| 3866 bool success = _task_queue->push(buffer[i]); | |
| 3867 // We only call this when the local queue is empty or under a | |
| 3868 // given target limit. So, we do not expect this push to fail. | |
|
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|
3869 assert(success, "invariant"); |
| 342 | 3870 } |
| 3871 | |
| 3872 statsOnly( int tmp_size = _task_queue->size(); | |
|
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|
3873 if (tmp_size > _local_max_size) { |
| 342 | 3874 _local_max_size = tmp_size; |
|
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|
3875 } |
| 342 | 3876 _local_pushes += n ); |
| 3877 } | |
| 3878 | |
| 3879 // this operation was quite expensive, so decrease the limits | |
| 3880 decrease_limits(); | |
| 3881 } | |
| 3882 | |
| 3883 void CMTask::drain_local_queue(bool partially) { | |
|
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|
3884 if (has_aborted()) return; |
| 342 | 3885 |
| 3886 // Decide what the target size is, depending whether we're going to | |
| 3887 // drain it partially (so that other tasks can steal if they run out | |
| 3888 // of things to do) or totally (at the very end). | |
| 3889 size_t target_size; | |
|
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|
3890 if (partially) { |
| 342 | 3891 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
|
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|
3892 } else { |
| 342 | 3893 target_size = 0; |
|
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|
3894 } |
| 342 | 3895 |
| 3896 if (_task_queue->size() > target_size) { | |
|
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|
3897 if (_cm->verbose_high()) { |
| 342 | 3898 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
| 3899 _task_id, target_size); | |
|
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|
3900 } |
| 342 | 3901 |
| 3902 oop obj; | |
| 3903 bool ret = _task_queue->pop_local(obj); | |
| 3904 while (ret) { | |
| 3905 statsOnly( ++_local_pops ); | |
| 3906 | |
|
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|
3907 if (_cm->verbose_high()) { |
| 342 | 3908 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
| 3909 (void*) obj); | |
|
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|
3910 } |
| 342 | 3911 |
|
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3912 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 3913 assert(!_g1h->is_on_master_free_list( |
| 2152 | 3914 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 3915 |
| 3916 scan_object(obj); | |
| 3917 | |
|
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|
3918 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 3919 ret = false; |
|
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3920 } else { |
| 342 | 3921 ret = _task_queue->pop_local(obj); |
|
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3922 } |
| 342 | 3923 } |
| 3924 | |
|
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|
3925 if (_cm->verbose_high()) { |
| 342 | 3926 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
| 3927 _task_id, _task_queue->size()); | |
|
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|
3928 } |
| 342 | 3929 } |
| 3930 } | |
| 3931 | |
| 3932 void CMTask::drain_global_stack(bool partially) { | |
|
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3933 if (has_aborted()) return; |
| 342 | 3934 |
| 3935 // We have a policy to drain the local queue before we attempt to | |
| 3936 // drain the global stack. | |
|
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3937 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 3938 |
| 3939 // Decide what the target size is, depending whether we're going to | |
| 3940 // drain it partially (so that other tasks can steal if they run out | |
| 3941 // of things to do) or totally (at the very end). Notice that, | |
| 3942 // because we move entries from the global stack in chunks or | |
| 3943 // because another task might be doing the same, we might in fact | |
| 3944 // drop below the target. But, this is not a problem. | |
| 3945 size_t target_size; | |
|
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3946 if (partially) { |
| 342 | 3947 target_size = _cm->partial_mark_stack_size_target(); |
|
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3948 } else { |
| 342 | 3949 target_size = 0; |
|
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3950 } |
| 342 | 3951 |
| 3952 if (_cm->mark_stack_size() > target_size) { | |
|
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3953 if (_cm->verbose_low()) { |
| 342 | 3954 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
| 3955 _task_id, target_size); | |
|
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|
3956 } |
| 342 | 3957 |
| 3958 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 3959 get_entries_from_global_stack(); | |
| 3960 drain_local_queue(partially); | |
| 3961 } | |
| 3962 | |
|
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|
3963 if (_cm->verbose_low()) { |
| 342 | 3964 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
| 3965 _task_id, _cm->mark_stack_size()); | |
|
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|
3966 } |
| 342 | 3967 } |
| 3968 } | |
| 3969 | |
| 3970 // SATB Queue has several assumptions on whether to call the par or | |
| 3971 // non-par versions of the methods. this is why some of the code is | |
| 3972 // replicated. We should really get rid of the single-threaded version | |
| 3973 // of the code to simplify things. | |
| 3974 void CMTask::drain_satb_buffers() { | |
|
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3975 if (has_aborted()) return; |
| 342 | 3976 |
| 3977 // We set this so that the regular clock knows that we're in the | |
| 3978 // middle of draining buffers and doesn't set the abort flag when it | |
| 3979 // notices that SATB buffers are available for draining. It'd be | |
| 3980 // very counter productive if it did that. :-) | |
| 3981 _draining_satb_buffers = true; | |
| 3982 | |
| 3983 CMObjectClosure oc(this); | |
| 3984 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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3985 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3986 satb_mq_set.set_par_closure(_task_id, &oc); |
|
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3987 } else { |
| 342 | 3988 satb_mq_set.set_closure(&oc); |
|
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3989 } |
| 342 | 3990 |
| 3991 // This keeps claiming and applying the closure to completed buffers | |
| 3992 // until we run out of buffers or we need to abort. | |
|
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|
3993 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3994 while (!has_aborted() && |
| 3995 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
|
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3996 if (_cm->verbose_medium()) { |
| 342 | 3997 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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3998 } |
| 342 | 3999 statsOnly( ++_satb_buffers_processed ); |
| 4000 regular_clock_call(); | |
| 4001 } | |
| 4002 } else { | |
| 4003 while (!has_aborted() && | |
| 4004 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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4005 if (_cm->verbose_medium()) { |
| 342 | 4006 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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|
4007 } |
| 342 | 4008 statsOnly( ++_satb_buffers_processed ); |
| 4009 regular_clock_call(); | |
| 4010 } | |
| 4011 } | |
| 4012 | |
| 4013 if (!concurrent() && !has_aborted()) { | |
| 4014 // We should only do this during remark. | |
|
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4015 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4016 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
|
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|
4017 } else { |
| 342 | 4018 satb_mq_set.iterate_closure_all_threads(); |
|
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4019 } |
| 342 | 4020 } |
| 4021 | |
| 4022 _draining_satb_buffers = false; | |
| 4023 | |
|
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|
4024 assert(has_aborted() || |
|
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4025 concurrent() || |
|
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4026 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 4027 |
|
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4028 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4029 satb_mq_set.set_par_closure(_task_id, NULL); |
|
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4030 } else { |
| 342 | 4031 satb_mq_set.set_closure(NULL); |
|
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4032 } |
| 342 | 4033 |
| 4034 // again, this was a potentially expensive operation, decrease the | |
| 4035 // limits to get the regular clock call early | |
| 4036 decrease_limits(); | |
| 4037 } | |
| 4038 | |
| 4039 void CMTask::drain_region_stack(BitMapClosure* bc) { | |
|
4787
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4040 assert(_cm->region_stack_empty(), "region stack should be empty"); |
|
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4041 assert(_aborted_region.is_empty(), "aborted region should be empty"); |
|
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4042 return; |
|
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|
4043 |
|
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4044 if (has_aborted()) return; |
| 342 | 4045 |
|
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4046 assert(_region_finger == NULL, |
|
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|
4047 "it should be NULL when we're not scanning a region"); |
| 342 | 4048 |
|
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|
4049 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
|
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4050 if (_cm->verbose_low()) { |
| 342 | 4051 gclog_or_tty->print_cr("[%d] draining region stack, size = %d", |
| 4052 _task_id, _cm->region_stack_size()); | |
|
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4053 } |
| 342 | 4054 |
|
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|
4055 MemRegion mr; |
|
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|
4056 |
|
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|
4057 if (!_aborted_region.is_empty()) { |
|
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4058 mr = _aborted_region; |
|
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4059 _aborted_region = MemRegion(); |
|
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|
4060 |
|
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|
4061 if (_cm->verbose_low()) { |
|
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4062 gclog_or_tty->print_cr("[%d] scanning aborted region " |
|
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4063 "[ " PTR_FORMAT ", " PTR_FORMAT " )", |
|
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4064 _task_id, mr.start(), mr.end()); |
|
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4065 } |
|
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4066 } else { |
|
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|
4067 mr = _cm->region_stack_pop_lock_free(); |
|
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4068 // it returns MemRegion() if the pop fails |
|
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|
4069 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
|
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|
4070 } |
| 342 | 4071 |
| 4072 while (mr.start() != NULL) { | |
|
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|
4073 if (_cm->verbose_medium()) { |
| 342 | 4074 gclog_or_tty->print_cr("[%d] we are scanning region " |
| 4075 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 4076 _task_id, mr.start(), mr.end()); | |
|
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|
4077 } |
|
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|
4078 |
|
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|
4079 assert(mr.end() <= _cm->finger(), |
|
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|
4080 "otherwise the region shouldn't be on the stack"); |
| 342 | 4081 assert(!mr.is_empty(), "Only non-empty regions live on the region stack"); |
| 4082 if (_nextMarkBitMap->iterate(bc, mr)) { | |
|
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|
4083 assert(!has_aborted(), |
|
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|
4084 "cannot abort the task without aborting the bitmap iteration"); |
| 342 | 4085 |
| 4086 // We finished iterating over the region without aborting. | |
| 4087 regular_clock_call(); | |
|
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|
4088 if (has_aborted()) { |
| 342 | 4089 mr = MemRegion(); |
|
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|
4090 } else { |
|
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|
4091 mr = _cm->region_stack_pop_lock_free(); |
| 342 | 4092 // it returns MemRegion() if the pop fails |
| 4093 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); | |
| 4094 } | |
| 4095 } else { | |
|
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|
4096 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4097 |
| 4098 // The only way to abort the bitmap iteration is to return | |
| 4099 // false from the do_bit() method. However, inside the | |
| 4100 // do_bit() method we move the _region_finger to point to the | |
| 4101 // object currently being looked at. So, if we bail out, we | |
| 4102 // have definitely set _region_finger to something non-null. | |
|
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|
4103 assert(_region_finger != NULL, "invariant"); |
| 342 | 4104 |
|
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|
4105 // Make sure that any previously aborted region has been |
|
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|
4106 // cleared. |
|
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|
4107 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
|
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|
4108 |
| 342 | 4109 // The iteration was actually aborted. So now _region_finger |
| 4110 // points to the address of the object we last scanned. If we | |
| 4111 // leave it there, when we restart this task, we will rescan | |
| 4112 // the object. It is easy to avoid this. We move the finger by | |
| 4113 // enough to point to the next possible object header (the | |
| 4114 // bitmap knows by how much we need to move it as it knows its | |
| 4115 // granularity). | |
| 4116 MemRegion newRegion = | |
| 4117 MemRegion(_nextMarkBitMap->nextWord(_region_finger), mr.end()); | |
| 4118 | |
| 4119 if (!newRegion.is_empty()) { | |
| 4120 if (_cm->verbose_low()) { | |
|
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|
4121 gclog_or_tty->print_cr("[%d] recording unscanned region" |
|
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|
4122 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
| 342 | 4123 _task_id, |
| 4124 newRegion.start(), newRegion.end()); | |
| 4125 } | |
|
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|
4126 // Now record the part of the region we didn't scan to |
|
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|
4127 // make sure this task scans it later. |
|
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|
4128 _aborted_region = newRegion; |
| 342 | 4129 } |
| 4130 // break from while | |
| 4131 mr = MemRegion(); | |
| 4132 } | |
| 4133 _region_finger = NULL; | |
| 4134 } | |
| 4135 | |
|
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|
4136 if (_cm->verbose_low()) { |
| 342 | 4137 gclog_or_tty->print_cr("[%d] drained region stack, size = %d", |
| 4138 _task_id, _cm->region_stack_size()); | |
|
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|
4139 } |
| 342 | 4140 } |
| 4141 } | |
| 4142 | |
| 4143 void CMTask::print_stats() { | |
| 4144 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
| 4145 _task_id, _calls); | |
| 4146 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
| 4147 _elapsed_time_ms, _termination_time_ms); | |
| 4148 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4149 _step_times_ms.num(), _step_times_ms.avg(), | |
| 4150 _step_times_ms.sd()); | |
| 4151 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4152 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 4153 | |
| 4154 #if _MARKING_STATS_ | |
| 4155 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4156 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 4157 _all_clock_intervals_ms.sd()); | |
| 4158 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4159 _all_clock_intervals_ms.maximum(), | |
| 4160 _all_clock_intervals_ms.sum()); | |
| 4161 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 4162 _clock_due_to_scanning, _clock_due_to_marking); | |
| 4163 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 4164 _objs_scanned, _objs_found_on_bitmap); | |
| 4165 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 4166 _local_pushes, _local_pops, _local_max_size); | |
| 4167 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 4168 _global_pushes, _global_pops, _global_max_size); | |
| 4169 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 4170 _global_transfers_to,_global_transfers_from); | |
| 4171 gclog_or_tty->print_cr(" Regions: claimed = %d, Region Stack: pops = %d", | |
| 4172 _regions_claimed, _region_stack_pops); | |
| 4173 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); | |
| 4174 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 4175 _steal_attempts, _steals); | |
| 4176 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 4177 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 4178 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 4179 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 4180 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 4181 #endif // _MARKING_STATS_ | |
| 4182 } | |
| 4183 | |
| 4184 /***************************************************************************** | |
| 4185 | |
| 4186 The do_marking_step(time_target_ms) method is the building block | |
| 4187 of the parallel marking framework. It can be called in parallel | |
| 4188 with other invocations of do_marking_step() on different tasks | |
| 4189 (but only one per task, obviously) and concurrently with the | |
| 4190 mutator threads, or during remark, hence it eliminates the need | |
| 4191 for two versions of the code. When called during remark, it will | |
| 4192 pick up from where the task left off during the concurrent marking | |
| 4193 phase. Interestingly, tasks are also claimable during evacuation | |
| 4194 pauses too, since do_marking_step() ensures that it aborts before | |
| 4195 it needs to yield. | |
| 4196 | |
| 4197 The data structures that is uses to do marking work are the | |
| 4198 following: | |
| 4199 | |
| 4200 (1) Marking Bitmap. If there are gray objects that appear only | |
| 4201 on the bitmap (this happens either when dealing with an overflow | |
| 4202 or when the initial marking phase has simply marked the roots | |
| 4203 and didn't push them on the stack), then tasks claim heap | |
| 4204 regions whose bitmap they then scan to find gray objects. A | |
| 4205 global finger indicates where the end of the last claimed region | |
| 4206 is. A local finger indicates how far into the region a task has | |
| 4207 scanned. The two fingers are used to determine how to gray an | |
| 4208 object (i.e. whether simply marking it is OK, as it will be | |
| 4209 visited by a task in the future, or whether it needs to be also | |
| 4210 pushed on a stack). | |
| 4211 | |
| 4212 (2) Local Queue. The local queue of the task which is accessed | |
| 4213 reasonably efficiently by the task. Other tasks can steal from | |
| 4214 it when they run out of work. Throughout the marking phase, a | |
| 4215 task attempts to keep its local queue short but not totally | |
| 4216 empty, so that entries are available for stealing by other | |
| 4217 tasks. Only when there is no more work, a task will totally | |
| 4218 drain its local queue. | |
| 4219 | |
| 4220 (3) Global Mark Stack. This handles local queue overflow. During | |
| 4221 marking only sets of entries are moved between it and the local | |
| 4222 queues, as access to it requires a mutex and more fine-grain | |
| 4223 interaction with it which might cause contention. If it | |
| 4224 overflows, then the marking phase should restart and iterate | |
| 4225 over the bitmap to identify gray objects. Throughout the marking | |
| 4226 phase, tasks attempt to keep the global mark stack at a small | |
| 4227 length but not totally empty, so that entries are available for | |
| 4228 popping by other tasks. Only when there is no more work, tasks | |
| 4229 will totally drain the global mark stack. | |
| 4230 | |
| 4231 (4) Global Region Stack. Entries on it correspond to areas of | |
| 4232 the bitmap that need to be scanned since they contain gray | |
| 4233 objects. Pushes on the region stack only happen during | |
| 4234 evacuation pauses and typically correspond to areas covered by | |
| 4235 GC LABS. If it overflows, then the marking phase should restart | |
| 4236 and iterate over the bitmap to identify gray objects. Tasks will | |
| 4237 try to totally drain the region stack as soon as possible. | |
| 4238 | |
| 4239 (5) SATB Buffer Queue. This is where completed SATB buffers are | |
| 4240 made available. Buffers are regularly removed from this queue | |
| 4241 and scanned for roots, so that the queue doesn't get too | |
| 4242 long. During remark, all completed buffers are processed, as | |
| 4243 well as the filled in parts of any uncompleted buffers. | |
| 4244 | |
| 4245 The do_marking_step() method tries to abort when the time target | |
| 4246 has been reached. There are a few other cases when the | |
| 4247 do_marking_step() method also aborts: | |
| 4248 | |
| 4249 (1) When the marking phase has been aborted (after a Full GC). | |
| 4250 | |
| 4251 (2) When a global overflow (either on the global stack or the | |
| 4252 region stack) has been triggered. Before the task aborts, it | |
| 4253 will actually sync up with the other tasks to ensure that all | |
| 4254 the marking data structures (local queues, stacks, fingers etc.) | |
| 4255 are re-initialised so that when do_marking_step() completes, | |
| 4256 the marking phase can immediately restart. | |
| 4257 | |
| 4258 (3) When enough completed SATB buffers are available. The | |
| 4259 do_marking_step() method only tries to drain SATB buffers right | |
| 4260 at the beginning. So, if enough buffers are available, the | |
| 4261 marking step aborts and the SATB buffers are processed at | |
| 4262 the beginning of the next invocation. | |
| 4263 | |
| 4264 (4) To yield. when we have to yield then we abort and yield | |
| 4265 right at the end of do_marking_step(). This saves us from a lot | |
| 4266 of hassle as, by yielding we might allow a Full GC. If this | |
| 4267 happens then objects will be compacted underneath our feet, the | |
| 4268 heap might shrink, etc. We save checking for this by just | |
| 4269 aborting and doing the yield right at the end. | |
| 4270 | |
| 4271 From the above it follows that the do_marking_step() method should | |
| 4272 be called in a loop (or, otherwise, regularly) until it completes. | |
| 4273 | |
| 4274 If a marking step completes without its has_aborted() flag being | |
| 4275 true, it means it has completed the current marking phase (and | |
| 4276 also all other marking tasks have done so and have all synced up). | |
| 4277 | |
| 4278 A method called regular_clock_call() is invoked "regularly" (in | |
| 4279 sub ms intervals) throughout marking. It is this clock method that | |
| 4280 checks all the abort conditions which were mentioned above and | |
| 4281 decides when the task should abort. A work-based scheme is used to | |
| 4282 trigger this clock method: when the number of object words the | |
| 4283 marking phase has scanned or the number of references the marking | |
| 4284 phase has visited reach a given limit. Additional invocations to | |
| 4285 the method clock have been planted in a few other strategic places | |
| 4286 too. The initial reason for the clock method was to avoid calling | |
| 4287 vtime too regularly, as it is quite expensive. So, once it was in | |
| 4288 place, it was natural to piggy-back all the other conditions on it | |
| 4289 too and not constantly check them throughout the code. | |
| 4290 | |
| 4291 *****************************************************************************/ | |
| 4292 | |
|
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|
4293 void CMTask::do_marking_step(double time_target_ms, |
|
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|
4294 bool do_stealing, |
|
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|
4295 bool do_termination) { |
|
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|
4296 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
|
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|
4297 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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|
4298 |
|
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|
4299 assert(concurrent() || _cm->region_stack_empty(), |
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|
4300 "the region stack should have been cleared before remark"); |
|
1835
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|
4301 assert(concurrent() || !_cm->has_aborted_regions(), |
|
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|
4302 "aborted regions should have been cleared before remark"); |
|
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|
4303 assert(_region_finger == NULL, |
|
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|
4304 "this should be non-null only when a region is being scanned"); |
| 342 | 4305 |
| 4306 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
|
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|
4307 assert(_task_queues != NULL, "invariant"); |
|
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|
4308 assert(_task_queue != NULL, "invariant"); |
|
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|
4309 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
|
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|
4310 |
|
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|
4311 assert(!_claimed, |
|
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|
4312 "only one thread should claim this task at any one time"); |
| 342 | 4313 |
| 4314 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 4315 // possible for two threads to set the _claimed flag at the same | |
| 4316 // time. But it is only for debugging purposes anyway and it will | |
| 4317 // catch most problems. | |
| 4318 _claimed = true; | |
| 4319 | |
| 4320 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4321 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 4322 | |
| 4323 double diff_prediction_ms = | |
| 4324 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 4325 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 4326 | |
| 4327 // set up the variables that are used in the work-based scheme to | |
| 4328 // call the regular clock method | |
| 4329 _words_scanned = 0; | |
| 4330 _refs_reached = 0; | |
| 4331 recalculate_limits(); | |
| 4332 | |
| 4333 // clear all flags | |
| 4334 clear_has_aborted(); | |
|
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|
4335 _has_timed_out = false; |
| 342 | 4336 _draining_satb_buffers = false; |
| 4337 | |
| 4338 ++_calls; | |
| 4339 | |
|
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|
4340 if (_cm->verbose_low()) { |
| 342 | 4341 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
| 4342 "target = %1.2lfms >>>>>>>>>>", | |
| 4343 _task_id, _calls, _time_target_ms); | |
|
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|
4344 } |
| 342 | 4345 |
| 4346 // Set up the bitmap and oop closures. Anything that uses them is | |
| 4347 // eventually called from this method, so it is OK to allocate these | |
| 4348 // statically. | |
| 4349 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 4350 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 4351 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 4352 |
| 4353 if (_cm->has_overflown()) { | |
| 4354 // This can happen if the region stack or the mark stack overflows | |
| 4355 // during a GC pause and this task, after a yield point, | |
| 4356 // restarts. We have to abort as we need to get into the overflow | |
| 4357 // protocol which happens right at the end of this task. | |
| 4358 set_has_aborted(); | |
| 4359 } | |
| 4360 | |
| 4361 // First drain any available SATB buffers. After this, we will not | |
| 4362 // look at SATB buffers before the next invocation of this method. | |
| 4363 // If enough completed SATB buffers are queued up, the regular clock | |
| 4364 // will abort this task so that it restarts. | |
| 4365 drain_satb_buffers(); | |
| 4366 // ...then partially drain the local queue and the global stack | |
| 4367 drain_local_queue(true); | |
| 4368 drain_global_stack(true); | |
| 4369 | |
| 4370 // Then totally drain the region stack. We will not look at | |
| 4371 // it again before the next invocation of this method. Entries on | |
| 4372 // the region stack are only added during evacuation pauses, for | |
| 4373 // which we have to yield. When we do, we abort the task anyway so | |
| 4374 // it will look at the region stack again when it restarts. | |
| 4375 bitmap_closure.set_scanning_heap_region(false); | |
| 4376 drain_region_stack(&bitmap_closure); | |
| 4377 // ...then partially drain the local queue and the global stack | |
| 4378 drain_local_queue(true); | |
| 4379 drain_global_stack(true); | |
| 4380 | |
| 4381 do { | |
| 4382 if (!has_aborted() && _curr_region != NULL) { | |
| 4383 // This means that we're already holding on to a region. | |
|
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|
4384 assert(_finger != NULL, "if region is not NULL, then the finger " |
|
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|
4385 "should not be NULL either"); |
| 342 | 4386 |
| 4387 // We might have restarted this task after an evacuation pause | |
| 4388 // which might have evacuated the region we're holding on to | |
| 4389 // underneath our feet. Let's read its limit again to make sure | |
| 4390 // that we do not iterate over a region of the heap that | |
| 4391 // contains garbage (update_region_limit() will also move | |
| 4392 // _finger to the start of the region if it is found empty). | |
| 4393 update_region_limit(); | |
| 4394 // We will start from _finger not from the start of the region, | |
| 4395 // as we might be restarting this task after aborting half-way | |
| 4396 // through scanning this region. In this case, _finger points to | |
| 4397 // the address where we last found a marked object. If this is a | |
| 4398 // fresh region, _finger points to start(). | |
| 4399 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 4400 | |
|
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|
4401 if (_cm->verbose_low()) { |
| 342 | 4402 gclog_or_tty->print_cr("[%d] we're scanning part " |
| 4403 "["PTR_FORMAT", "PTR_FORMAT") " | |
| 4404 "of region "PTR_FORMAT, | |
| 4405 _task_id, _finger, _region_limit, _curr_region); | |
|
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|
4406 } |
| 342 | 4407 |
| 4408 // Let's iterate over the bitmap of the part of the | |
| 4409 // region that is left. | |
| 4410 bitmap_closure.set_scanning_heap_region(true); | |
| 4411 if (mr.is_empty() || | |
| 4412 _nextMarkBitMap->iterate(&bitmap_closure, mr)) { | |
| 4413 // We successfully completed iterating over the region. Now, | |
| 4414 // let's give up the region. | |
| 4415 giveup_current_region(); | |
| 4416 regular_clock_call(); | |
| 4417 } else { | |
|
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|
4418 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4419 // The only way to abort the bitmap iteration is to return |
| 4420 // false from the do_bit() method. However, inside the | |
| 4421 // do_bit() method we move the _finger to point to the | |
| 4422 // object currently being looked at. So, if we bail out, we | |
| 4423 // have definitely set _finger to something non-null. | |
|
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|
4424 assert(_finger != NULL, "invariant"); |
| 342 | 4425 |
| 4426 // Region iteration was actually aborted. So now _finger | |
| 4427 // points to the address of the object we last scanned. If we | |
| 4428 // leave it there, when we restart this task, we will rescan | |
| 4429 // the object. It is easy to avoid this. We move the finger by | |
| 4430 // enough to point to the next possible object header (the | |
| 4431 // bitmap knows by how much we need to move it as it knows its | |
| 4432 // granularity). | |
|
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|
4433 assert(_finger < _region_limit, "invariant"); |
|
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|
4434 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
|
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|
4435 // Check if bitmap iteration was aborted while scanning the last object |
|
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|
4436 if (new_finger >= _region_limit) { |
|
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|
4437 giveup_current_region(); |
|
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|
4438 } else { |
|
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|
4439 move_finger_to(new_finger); |
|
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|
4440 } |
| 342 | 4441 } |
| 4442 } | |
| 4443 // At this point we have either completed iterating over the | |
| 4444 // region we were holding on to, or we have aborted. | |
| 4445 | |
| 4446 // We then partially drain the local queue and the global stack. | |
| 4447 // (Do we really need this?) | |
| 4448 drain_local_queue(true); | |
| 4449 drain_global_stack(true); | |
| 4450 | |
| 4451 // Read the note on the claim_region() method on why it might | |
| 4452 // return NULL with potentially more regions available for | |
| 4453 // claiming and why we have to check out_of_regions() to determine | |
| 4454 // whether we're done or not. | |
| 4455 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 4456 // We are going to try to claim a new region. We should have | |
| 4457 // given up on the previous one. | |
|
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|
4458 // Separated the asserts so that we know which one fires. |
|
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|
4459 assert(_curr_region == NULL, "invariant"); |
|
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|
4460 assert(_finger == NULL, "invariant"); |
|
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|
4461 assert(_region_limit == NULL, "invariant"); |
|
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|
4462 if (_cm->verbose_low()) { |
| 342 | 4463 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
|
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|
4464 } |
| 342 | 4465 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
| 4466 if (claimed_region != NULL) { | |
| 4467 // Yes, we managed to claim one | |
| 4468 statsOnly( ++_regions_claimed ); | |
| 4469 | |
|
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|
4470 if (_cm->verbose_low()) { |
| 342 | 4471 gclog_or_tty->print_cr("[%d] we successfully claimed " |
| 4472 "region "PTR_FORMAT, | |
| 4473 _task_id, claimed_region); | |
|
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|
4474 } |
| 342 | 4475 |
| 4476 setup_for_region(claimed_region); | |
|
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|
4477 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 4478 } |
| 4479 // It is important to call the regular clock here. It might take | |
| 4480 // a while to claim a region if, for example, we hit a large | |
| 4481 // block of empty regions. So we need to call the regular clock | |
| 4482 // method once round the loop to make sure it's called | |
| 4483 // frequently enough. | |
| 4484 regular_clock_call(); | |
| 4485 } | |
| 4486 | |
| 4487 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
4488 assert(_cm->out_of_regions(), |
|
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|
4489 "at this point we should be out of regions"); |
| 342 | 4490 } |
| 4491 } while ( _curr_region != NULL && !has_aborted()); | |
| 4492 | |
| 4493 if (!has_aborted()) { | |
| 4494 // We cannot check whether the global stack is empty, since other | |
|
343
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diff
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|
4495 // tasks might be pushing objects to it concurrently. We also cannot |
|
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diff
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|
4496 // check if the region stack is empty because if a thread is aborting |
|
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diff
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|
4497 // it can push a partially done region back. |
|
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|
4498 assert(_cm->out_of_regions(), |
|
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|
4499 "at this point we should be out of regions"); |
| 342 | 4500 |
|
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|
4501 if (_cm->verbose_low()) { |
| 342 | 4502 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
|
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|
4503 } |
| 342 | 4504 |
| 4505 // Try to reduce the number of available SATB buffers so that | |
| 4506 // remark has less work to do. | |
| 4507 drain_satb_buffers(); | |
| 4508 } | |
| 4509 | |
| 4510 // Since we've done everything else, we can now totally drain the | |
| 4511 // local queue and global stack. | |
| 4512 drain_local_queue(false); | |
| 4513 drain_global_stack(false); | |
| 4514 | |
| 4515 // Attempt at work stealing from other task's queues. | |
|
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|
4516 if (do_stealing && !has_aborted()) { |
| 342 | 4517 // We have not aborted. This means that we have finished all that |
| 4518 // we could. Let's try to do some stealing... | |
| 4519 | |
| 4520 // 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
changeset
|
4521 // 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
parents:
342
diff
changeset
|
4522 // 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
parents:
342
diff
changeset
|
4523 // it can push a partially done region back. |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4524 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
11d4857fe5e1
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diff
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|
4525 "only way to reach here"); |
| 342 | 4526 |
|
3776
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|
4527 if (_cm->verbose_low()) { |
| 342 | 4528 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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changeset
|
4529 } |
| 342 | 4530 |
| 4531 while (!has_aborted()) { | |
| 4532 oop obj; | |
| 4533 statsOnly( ++_steal_attempts ); | |
| 4534 | |
| 4535 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
|
3776
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|
4536 if (_cm->verbose_medium()) { |
| 342 | 4537 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
| 4538 _task_id, (void*) obj); | |
|
3776
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diff
changeset
|
4539 } |
| 342 | 4540 |
| 4541 statsOnly( ++_steals ); | |
| 4542 | |
|
1023
11d4857fe5e1
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diff
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|
4543 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
11d4857fe5e1
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diff
changeset
|
4544 "any stolen object should be marked"); |
| 342 | 4545 scan_object(obj); |
| 4546 | |
| 4547 // And since we're towards the end, let's totally drain the | |
| 4548 // local queue and global stack. | |
| 4549 drain_local_queue(false); | |
| 4550 drain_global_stack(false); | |
| 4551 } else { | |
| 4552 break; | |
| 4553 } | |
| 4554 } | |
| 4555 } | |
| 4556 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4557 // 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
parents:
2436
diff
changeset
|
4558 // should raise the overflow flag. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4559 if (do_termination && !has_aborted()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4560 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
parents:
2436
diff
changeset
|
4561 _cm->set_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
|
4562 regular_clock_call(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4563 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4564 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4565 |
| 342 | 4566 // We still haven't aborted. Now, let's try to get into the |
| 4567 // termination protocol. | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
4568 if (do_termination && !has_aborted()) { |
| 342 | 4569 // 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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342
diff
changeset
|
4570 // tasks might be concurrently pushing objects on it. We also cannot |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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342
diff
changeset
|
4571 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
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342
diff
changeset
|
4572 // it can push a partially done region back. |
|
1023
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1022
diff
changeset
|
4573 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4574 assert(_cm->out_of_regions(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4575 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 4576 |
|
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|
4577 if (_cm->verbose_low()) { |
| 342 | 4578 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
|
3776
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changeset
|
4579 } |
| 342 | 4580 |
| 4581 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4582 // The CMTask class also extends the TerminatorTerminator class, | |
| 4583 // hence its should_exit_termination() method will also decide | |
| 4584 // whether to exit the termination protocol or not. | |
| 4585 bool finished = _cm->terminator()->offer_termination(this); | |
| 4586 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
| 4587 _termination_time_ms += | |
| 4588 termination_end_time_ms - _termination_start_time_ms; | |
| 4589 | |
| 4590 if (finished) { | |
| 4591 // We're all done. | |
| 4592 | |
| 4593 if (_task_id == 0) { | |
| 4594 // let's allow task 0 to do this | |
| 4595 if (concurrent()) { | |
|
1023
11d4857fe5e1
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tonyp
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changeset
|
4596 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 4597 // we need to set this to false before the next |
| 4598 // safepoint. This way we ensure that the marking phase | |
| 4599 // doesn't observe any more heap expansions. | |
| 4600 _cm->clear_concurrent_marking_in_progress(); | |
| 4601 } | |
| 4602 } | |
| 4603 | |
| 4604 // We can now guarantee that the global stack is empty, since | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4605 // all other tasks have finished. We separated the guarantees so |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
1022
diff
changeset
|
4606 // that, if a condition is false, we can immediately find out |
|
11d4857fe5e1
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tonyp
parents:
1022
diff
changeset
|
4607 // which one. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4608 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
parents:
1833
diff
changeset
|
4609 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4610 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4611 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4612 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4613 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4614 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4615 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
| 342 | 4616 |
|
3776
23d434c6290d
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diff
changeset
|
4617 if (_cm->verbose_low()) { |
| 342 | 4618 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4619 } |
| 342 | 4620 } else { |
| 4621 // Apparently there's more work to do. Let's abort this task. It | |
| 4622 // will restart it and we can hopefully find more things to do. | |
| 4623 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4624 if (_cm->verbose_low()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4625 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4626 _task_id); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4627 } |
| 342 | 4628 |
| 4629 set_has_aborted(); | |
| 4630 statsOnly( ++_aborted_termination ); | |
| 4631 } | |
| 4632 } | |
| 4633 | |
| 4634 // Mainly for debugging purposes to make sure that a pointer to the | |
| 4635 // closure which was statically allocated in this frame doesn't | |
| 4636 // escape it by accident. | |
| 3771 | 4637 set_cm_oop_closure(NULL); |
| 342 | 4638 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 4639 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 4640 // Update the step history. | |
| 4641 _step_times_ms.add(elapsed_time_ms); | |
| 4642 | |
| 4643 if (has_aborted()) { | |
| 4644 // The task was aborted for some reason. | |
| 4645 | |
| 4646 statsOnly( ++_aborted ); | |
| 4647 | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4648 if (_has_timed_out) { |
| 342 | 4649 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 4650 // Keep statistics of how well we did with respect to hitting | |
| 4651 // our target only if we actually timed out (if we aborted for | |
| 4652 // other reasons, then the results might get skewed). | |
| 4653 _marking_step_diffs_ms.add(diff_ms); | |
| 4654 } | |
| 4655 | |
| 4656 if (_cm->has_overflown()) { | |
| 4657 // This is the interesting one. We aborted because a global | |
| 4658 // overflow was raised. This means we have to restart the | |
| 4659 // marking phase and start iterating over regions. However, in | |
| 4660 // order to do this we have to make sure that all tasks stop | |
| 4661 // what they are doing and re-initialise in a safe manner. We | |
| 4662 // will achieve this with the use of two barrier sync points. | |
| 4663 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4664 if (_cm->verbose_low()) { |
| 342 | 4665 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4666 } |
| 342 | 4667 |
| 4668 _cm->enter_first_sync_barrier(_task_id); | |
| 4669 // When we exit this sync barrier we know that all tasks have | |
| 4670 // stopped doing marking work. So, it's now safe to | |
| 4671 // re-initialise our data structures. At the end of this method, | |
| 4672 // task 0 will clear the global data structures. | |
| 4673 | |
| 4674 statsOnly( ++_aborted_overflow ); | |
| 4675 | |
| 4676 // We clear the local state of this task... | |
| 4677 clear_region_fields(); | |
| 4678 | |
| 4679 // ...and enter the second barrier. | |
| 4680 _cm->enter_second_sync_barrier(_task_id); | |
| 4681 // At this point everything has bee re-initialised and we're | |
| 4682 // ready to restart. | |
| 4683 } | |
| 4684 | |
| 4685 if (_cm->verbose_low()) { | |
| 4686 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
| 4687 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4688 _task_id, _time_target_ms, elapsed_time_ms); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4689 if (_cm->has_aborted()) { |
| 342 | 4690 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
| 4691 _task_id); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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diff
changeset
|
4692 } |
| 342 | 4693 } |
| 4694 } else { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4695 if (_cm->verbose_low()) { |
| 342 | 4696 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 4697 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4698 _task_id, _time_target_ms, elapsed_time_ms); | |
|
3776
23d434c6290d
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tonyp
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3772
diff
changeset
|
4699 } |
| 342 | 4700 } |
| 4701 | |
| 4702 _claimed = false; | |
| 4703 } | |
| 4704 | |
| 4705 CMTask::CMTask(int task_id, | |
| 4706 ConcurrentMark* cm, | |
| 4707 CMTaskQueue* task_queue, | |
| 4708 CMTaskQueueSet* task_queues) | |
| 4709 : _g1h(G1CollectedHeap::heap()), | |
| 4710 _task_id(task_id), _cm(cm), | |
| 4711 _claimed(false), | |
| 4712 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 4713 _task_queue(task_queue), | |
| 4714 _task_queues(task_queues), | |
| 3771 | 4715 _cm_oop_closure(NULL), |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4716 _aborted_region(MemRegion()) { |
|
1023
11d4857fe5e1
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1022
diff
changeset
|
4717 guarantee(task_queue != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4718 guarantee(task_queues != NULL, "invariant"); |
| 342 | 4719 |
| 4720 statsOnly( _clock_due_to_scanning = 0; | |
| 4721 _clock_due_to_marking = 0 ); | |
| 4722 | |
| 4723 _marking_step_diffs_ms.add(0.5); | |
| 4724 } | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4725 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4726 // These are formatting macros that are used below to ensure |
|
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
|
4727 // 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
tonyp
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2369
diff
changeset
|
4728 // header for a particular value and they should be kept consistent |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4729 // 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
tonyp
parents:
2369
diff
changeset
|
4730 // 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
parents:
2369
diff
changeset
|
4731 // easier to compose. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4732 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4733 // 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
parents:
2369
diff
changeset
|
4734 // 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
tonyp
parents:
2369
diff
changeset
|
4735 #define 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
|
4736 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4737 #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
parents:
2369
diff
changeset
|
4738 #ifdef _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4739 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
|
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
|
4740 #else // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4741 #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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2369
diff
changeset
|
4742 #endif // _LP64 |
|
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
|
4743 |
|
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
|
4744 // 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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diff
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|
4745 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4746 #define G1PPRL_TYPE_H_FORMAT " %4s" |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4747 #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
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diff
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|
4748 #define G1PPRL_BYTE_H_FORMAT " %9s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4749 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
|
371bbc844bf1
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|
4750 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4751 |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4752 // For summary info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4753 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4754 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4755 #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
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|
4756 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4757 |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4758 G1PrintRegionLivenessInfoClosure:: |
|
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|
4759 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
|
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|
4760 : _out(out), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4761 _total_used_bytes(0), _total_capacity_bytes(0), |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4762 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
|
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|
4763 _hum_used_bytes(0), _hum_capacity_bytes(0), |
|
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|
4764 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
|
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|
4765 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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|
4766 MemRegion g1_committed = g1h->g1_committed(); |
|
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|
4767 MemRegion g1_reserved = g1h->g1_reserved(); |
|
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|
4768 double now = os::elapsedTime(); |
|
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|
4769 |
|
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|
4770 // Print the header of the output. |
|
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|
4771 _out->cr(); |
|
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|
4772 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
|
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|
4773 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
|
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|
4774 G1PPRL_SUM_ADDR_FORMAT("committed") |
|
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|
4775 G1PPRL_SUM_ADDR_FORMAT("reserved") |
|
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|
4776 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
|
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|
4777 g1_committed.start(), g1_committed.end(), |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4778 g1_reserved.start(), g1_reserved.end(), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4779 HeapRegion::GrainBytes); |
|
2435
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4780 _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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|
4781 _out->print_cr(G1PPRL_LINE_PREFIX |
|
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|
4782 G1PPRL_TYPE_H_FORMAT |
|
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|
4783 G1PPRL_ADDR_BASE_H_FORMAT |
|
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|
4784 G1PPRL_BYTE_H_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4785 G1PPRL_BYTE_H_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4786 G1PPRL_BYTE_H_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4787 G1PPRL_DOUBLE_H_FORMAT, |
|
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|
4788 "type", "address-range", |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4789 "used", "prev-live", "next-live", "gc-eff"); |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4790 _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
|
4791 G1PPRL_TYPE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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|
4792 G1PPRL_ADDR_BASE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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|
4793 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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|
4794 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
diff
changeset
|
4795 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4796 G1PPRL_DOUBLE_H_FORMAT, |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4797 "", "", |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4798 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4799 } |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4800 |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4801 // 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
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|
4802 // 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
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|
4803 // series (either the region size, or what's left if the _hum_* field |
|
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|
4804 // 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
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|
4805 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
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|
4806 size_t bytes = 0; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4807 // 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
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|
4808 // could be 0. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4809 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4810 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4811 *hum_bytes -= bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4812 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4813 return bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4814 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4815 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4816 // 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
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diff
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|
4817 // 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
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diff
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|
4818 // 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
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diff
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|
4819 // 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
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|
4820 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
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|
4821 size_t* capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4822 size_t* prev_live_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4823 size_t* next_live_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4824 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
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diff
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|
4825 *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
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diff
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|
4826 *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
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diff
changeset
|
4827 *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
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diff
changeset
|
4828 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4829 } |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4830 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4831 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4832 const char* type = ""; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4833 HeapWord* bottom = r->bottom(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4834 HeapWord* end = r->end(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4835 size_t capacity_bytes = r->capacity(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4836 size_t used_bytes = r->used(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4837 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
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diff
changeset
|
4838 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
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diff
changeset
|
4839 double gc_eff = r->gc_efficiency(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4840 if (r->used() == 0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4841 type = "FREE"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4842 } else if (r->is_survivor()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4843 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4844 } else if (r->is_young()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4845 type = "EDEN"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4846 } else if (r->startsHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4847 type = "HUMS"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4848 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4849 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
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changeset
|
4850 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
|
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diff
changeset
|
4851 "they should have been zeroed after the last time we used them"); |
|
371bbc844bf1
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changeset
|
4852 // Set up the _hum_* fields. |
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4853 _hum_capacity_bytes = capacity_bytes; |
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4854 _hum_used_bytes = used_bytes; |
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4855 _hum_prev_live_bytes = prev_live_bytes; |
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4856 _hum_next_live_bytes = next_live_bytes; |
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4857 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4858 &prev_live_bytes, &next_live_bytes); |
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4859 end = bottom + HeapRegion::GrainWords; |
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4860 } else if (r->continuesHumongous()) { |
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4861 type = "HUMC"; |
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4862 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4863 &prev_live_bytes, &next_live_bytes); |
|
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4864 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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4865 } else { |
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4866 type = "OLD"; |
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|
4867 } |
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|
4868 |
|
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|
4869 _total_used_bytes += used_bytes; |
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4870 _total_capacity_bytes += capacity_bytes; |
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4871 _total_prev_live_bytes += prev_live_bytes; |
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4872 _total_next_live_bytes += next_live_bytes; |
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|
4873 |
|
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|
4874 // Print a line for this particular region. |
|
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|
4875 _out->print_cr(G1PPRL_LINE_PREFIX |
|
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|
4876 G1PPRL_TYPE_FORMAT |
|
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|
4877 G1PPRL_ADDR_BASE_FORMAT |
|
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|
4878 G1PPRL_BYTE_FORMAT |
|
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|
4879 G1PPRL_BYTE_FORMAT |
|
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|
4880 G1PPRL_BYTE_FORMAT |
|
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|
4881 G1PPRL_DOUBLE_FORMAT, |
|
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|
4882 type, bottom, end, |
|
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|
4883 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
|
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|
4884 |
|
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|
4885 return false; |
|
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|
4886 } |
|
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|
4887 |
|
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|
4888 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
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|
4889 // Print the footer of the output. |
|
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|
4890 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
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|
4891 _out->print_cr(G1PPRL_LINE_PREFIX |
|
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|
4892 " SUMMARY" |
|
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|
4893 G1PPRL_SUM_MB_FORMAT("capacity") |
|
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|
4894 G1PPRL_SUM_MB_PERC_FORMAT("used") |
|
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|
4895 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
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|
4896 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
|
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|
4897 bytes_to_mb(_total_capacity_bytes), |
|
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|
4898 bytes_to_mb(_total_used_bytes), |
|
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|
4899 perc(_total_used_bytes, _total_capacity_bytes), |
|
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|
4900 bytes_to_mb(_total_prev_live_bytes), |
|
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diff
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|
4901 perc(_total_prev_live_bytes, _total_capacity_bytes), |
|
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|
4902 bytes_to_mb(_total_next_live_bytes), |
|
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changeset
|
4903 perc(_total_next_live_bytes, _total_capacity_bytes)); |
|
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|
4904 _out->cr(); |
|
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|
4905 } |