Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 4836:d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
Summary: Remove the separate counting phase of concurrent marking by tracking the amount of marked bytes and the cards spanned by marked objects in marking task/worker thread local data structures, which are updated as individual objects are marked.
Reviewed-by: brutisso, tonyp
| author | johnc |
|---|---|
| date | Thu, 12 Jan 2012 00:06:47 -0800 |
| parents | 0b3d1ec6eaee |
| children | eff609af17d7 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/symbolTable.hpp" | |
| 3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
| 1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
| 29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
| 3771 | 32 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
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34 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 35 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 36 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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37 #include "gc_implementation/shared/vmGCOperations.hpp" |
| 1972 | 38 #include "memory/genOopClosures.inline.hpp" |
| 39 #include "memory/referencePolicy.hpp" | |
| 40 #include "memory/resourceArea.hpp" | |
| 41 #include "oops/oop.inline.hpp" | |
| 42 #include "runtime/handles.inline.hpp" | |
| 43 #include "runtime/java.hpp" | |
| 342 | 44 |
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45 // Concurrent marking bit map wrapper |
| 342 | 46 |
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47 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
| 342 | 48 _bm((uintptr_t*)NULL,0), |
| 49 _shifter(shifter) { | |
| 50 _bmStartWord = (HeapWord*)(rs.base()); | |
| 51 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
| 52 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
| 53 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
| 54 | |
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55 guarantee(brs.is_reserved(), "couldn't allocate concurrent marking bit map"); |
| 342 | 56 // For now we'll just commit all of the bit map up fromt. |
| 57 // Later on we'll try to be more parsimonious with swap. | |
| 58 guarantee(_virtual_space.initialize(brs, brs.size()), | |
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59 "couldn't reseve backing store for concurrent marking bit map"); |
| 342 | 60 assert(_virtual_space.committed_size() == brs.size(), |
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61 "didn't reserve backing store for all of concurrent marking bit map?"); |
| 342 | 62 _bm.set_map((uintptr_t*)_virtual_space.low()); |
| 63 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
| 64 _bmWordSize, "inconsistency in bit map sizing"); | |
| 65 _bm.set_size(_bmWordSize >> _shifter); | |
| 66 } | |
| 67 | |
| 68 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
| 69 HeapWord* limit) const { | |
| 70 // First we must round addr *up* to a possible object boundary. | |
| 71 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
| 72 HeapWordSize << _shifter); | |
| 73 size_t addrOffset = heapWordToOffset(addr); | |
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74 if (limit == NULL) { |
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75 limit = _bmStartWord + _bmWordSize; |
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76 } |
| 342 | 77 size_t limitOffset = heapWordToOffset(limit); |
| 78 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
| 79 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 80 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 81 assert(nextAddr == limit || isMarked(nextAddr), | |
| 82 "get_next_one postcondition"); | |
| 83 return nextAddr; | |
| 84 } | |
| 85 | |
| 86 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
| 87 HeapWord* limit) const { | |
| 88 size_t addrOffset = heapWordToOffset(addr); | |
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89 if (limit == NULL) { |
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90 limit = _bmStartWord + _bmWordSize; |
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91 } |
| 342 | 92 size_t limitOffset = heapWordToOffset(limit); |
| 93 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
| 94 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 95 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 96 assert(nextAddr == limit || !isMarked(nextAddr), | |
| 97 "get_next_one postcondition"); | |
| 98 return nextAddr; | |
| 99 } | |
| 100 | |
| 101 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
| 102 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
| 103 return (int) (diff >> _shifter); | |
| 104 } | |
| 105 | |
| 106 void CMBitMapRO::mostly_disjoint_range_union(BitMap* from_bitmap, | |
| 107 size_t from_start_index, | |
| 108 HeapWord* to_start_word, | |
| 109 size_t word_num) { | |
| 110 _bm.mostly_disjoint_range_union(from_bitmap, | |
| 111 from_start_index, | |
| 112 heapWordToOffset(to_start_word), | |
| 113 word_num); | |
| 114 } | |
| 115 | |
| 116 #ifndef PRODUCT | |
| 117 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
| 118 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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119 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
| 342 | 120 "size inconsistency"); |
| 121 return _bmStartWord == (HeapWord*)(rs.base()) && | |
| 122 _bmWordSize == rs.size()>>LogHeapWordSize; | |
| 123 } | |
| 124 #endif | |
| 125 | |
| 126 void CMBitMap::clearAll() { | |
| 127 _bm.clear(); | |
| 128 return; | |
| 129 } | |
| 130 | |
| 131 void CMBitMap::markRange(MemRegion mr) { | |
| 132 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 133 assert(!mr.is_empty(), "unexpected empty region"); | |
| 134 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 135 ((HeapWord *) mr.end())), | |
| 136 "markRange memory region end is not card aligned"); | |
| 137 // convert address range into offset range | |
| 138 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 139 heapWordToOffset(mr.end()), true); | |
| 140 } | |
| 141 | |
| 142 void CMBitMap::clearRange(MemRegion mr) { | |
| 143 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 144 assert(!mr.is_empty(), "unexpected empty region"); | |
| 145 // convert address range into offset range | |
| 146 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 147 heapWordToOffset(mr.end()), false); | |
| 148 } | |
| 149 | |
| 150 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 151 HeapWord* end_addr) { | |
| 152 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 153 start = MIN2(start, end_addr); | |
| 154 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 155 end = MIN2(end, end_addr); | |
| 156 assert(start <= end, "Consistency check"); | |
| 157 MemRegion mr(start, end); | |
| 158 if (!mr.is_empty()) { | |
| 159 clearRange(mr); | |
| 160 } | |
| 161 return mr; | |
| 162 } | |
| 163 | |
| 164 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 165 _base(NULL), _cm(cm) | |
| 166 #ifdef ASSERT | |
| 167 , _drain_in_progress(false) | |
| 168 , _drain_in_progress_yields(false) | |
| 169 #endif | |
| 170 {} | |
| 171 | |
| 172 void CMMarkStack::allocate(size_t size) { | |
| 173 _base = NEW_C_HEAP_ARRAY(oop, size); | |
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174 if (_base == NULL) { |
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175 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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176 } |
| 342 | 177 _index = 0; |
| 178 _capacity = (jint) size; | |
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179 _saved_index = -1; |
| 342 | 180 NOT_PRODUCT(_max_depth = 0); |
| 181 } | |
| 182 | |
| 183 CMMarkStack::~CMMarkStack() { | |
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184 if (_base != NULL) { |
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185 FREE_C_HEAP_ARRAY(oop, _base); |
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186 } |
| 342 | 187 } |
| 188 | |
| 189 void CMMarkStack::par_push(oop ptr) { | |
| 190 while (true) { | |
| 191 if (isFull()) { | |
| 192 _overflow = true; | |
| 193 return; | |
| 194 } | |
| 195 // Otherwise... | |
| 196 jint index = _index; | |
| 197 jint next_index = index+1; | |
| 198 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 199 if (res == index) { | |
| 200 _base[index] = ptr; | |
| 201 // Note that we don't maintain this atomically. We could, but it | |
| 202 // doesn't seem necessary. | |
| 203 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 204 return; | |
| 205 } | |
| 206 // Otherwise, we need to try again. | |
| 207 } | |
| 208 } | |
| 209 | |
| 210 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 211 while (true) { | |
| 212 if (isFull()) { | |
| 213 _overflow = true; | |
| 214 return; | |
| 215 } | |
| 216 // Otherwise... | |
| 217 jint index = _index; | |
| 218 jint next_index = index + n; | |
| 219 if (next_index > _capacity) { | |
| 220 _overflow = true; | |
| 221 return; | |
| 222 } | |
| 223 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 224 if (res == index) { | |
| 225 for (int i = 0; i < n; i++) { | |
| 226 int ind = index + i; | |
| 227 assert(ind < _capacity, "By overflow test above."); | |
| 228 _base[ind] = ptr_arr[i]; | |
| 229 } | |
| 230 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 231 return; | |
| 232 } | |
| 233 // Otherwise, we need to try again. | |
| 234 } | |
| 235 } | |
| 236 | |
| 237 | |
| 238 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 239 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 240 jint start = _index; | |
| 241 jint next_index = start + n; | |
| 242 if (next_index > _capacity) { | |
| 243 _overflow = true; | |
| 244 return; | |
| 245 } | |
| 246 // Otherwise. | |
| 247 _index = next_index; | |
| 248 for (int i = 0; i < n; i++) { | |
| 249 int ind = start + i; | |
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250 assert(ind < _capacity, "By overflow test above."); |
| 342 | 251 _base[ind] = ptr_arr[i]; |
| 252 } | |
| 253 } | |
| 254 | |
| 255 | |
| 256 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 257 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 258 jint index = _index; | |
| 259 if (index == 0) { | |
| 260 *n = 0; | |
| 261 return false; | |
| 262 } else { | |
| 263 int k = MIN2(max, index); | |
| 264 jint new_ind = index - k; | |
| 265 for (int j = 0; j < k; j++) { | |
| 266 ptr_arr[j] = _base[new_ind + j]; | |
| 267 } | |
| 268 _index = new_ind; | |
| 269 *n = k; | |
| 270 return true; | |
| 271 } | |
| 272 } | |
| 273 | |
| 274 CMRegionStack::CMRegionStack() : _base(NULL) {} | |
| 275 | |
| 276 void CMRegionStack::allocate(size_t size) { | |
| 277 _base = NEW_C_HEAP_ARRAY(MemRegion, size); | |
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278 if (_base == NULL) { |
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279 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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280 } |
| 342 | 281 _index = 0; |
| 282 _capacity = (jint) size; | |
| 283 } | |
| 284 | |
| 285 CMRegionStack::~CMRegionStack() { | |
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286 if (_base != NULL) { |
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287 FREE_C_HEAP_ARRAY(oop, _base); |
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288 } |
| 342 | 289 } |
| 290 | |
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291 void CMRegionStack::push_lock_free(MemRegion mr) { |
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292 guarantee(false, "push_lock_free(): don't call this any more"); |
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293 |
| 342 | 294 assert(mr.word_size() > 0, "Precondition"); |
| 295 while (true) { | |
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296 jint index = _index; |
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297 |
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298 if (index >= _capacity) { |
| 342 | 299 _overflow = true; |
| 300 return; | |
| 301 } | |
| 302 // Otherwise... | |
| 303 jint next_index = index+1; | |
| 304 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 305 if (res == index) { | |
| 306 _base[index] = mr; | |
| 307 return; | |
| 308 } | |
| 309 // Otherwise, we need to try again. | |
| 310 } | |
| 311 } | |
| 312 | |
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313 // Lock-free pop of the region stack. Called during the concurrent |
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314 // marking / remark phases. Should only be called in tandem with |
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315 // other lock-free pops. |
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316 MemRegion CMRegionStack::pop_lock_free() { |
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317 guarantee(false, "pop_lock_free(): don't call this any more"); |
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318 |
| 342 | 319 while (true) { |
| 320 jint index = _index; | |
| 321 | |
| 322 if (index == 0) { | |
| 323 return MemRegion(); | |
| 324 } | |
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325 // Otherwise... |
| 342 | 326 jint next_index = index-1; |
| 327 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 328 if (res == index) { | |
| 329 MemRegion mr = _base[next_index]; | |
| 330 if (mr.start() != NULL) { | |
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331 assert(mr.end() != NULL, "invariant"); |
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332 assert(mr.word_size() > 0, "invariant"); |
| 342 | 333 return mr; |
| 334 } else { | |
| 335 // that entry was invalidated... let's skip it | |
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336 assert(mr.end() == NULL, "invariant"); |
| 342 | 337 } |
| 338 } | |
| 339 // Otherwise, we need to try again. | |
| 340 } | |
| 341 } | |
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342 |
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343 #if 0 |
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344 // The routines that manipulate the region stack with a lock are |
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345 // not currently used. They should be retained, however, as a |
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346 // diagnostic aid. |
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347 |
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348 void CMRegionStack::push_with_lock(MemRegion mr) { |
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349 assert(mr.word_size() > 0, "Precondition"); |
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350 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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351 |
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352 if (isFull()) { |
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353 _overflow = true; |
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354 return; |
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355 } |
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356 |
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357 _base[_index] = mr; |
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358 _index += 1; |
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359 } |
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360 |
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361 MemRegion CMRegionStack::pop_with_lock() { |
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362 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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363 |
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364 while (true) { |
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365 if (_index == 0) { |
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366 return MemRegion(); |
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367 } |
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368 _index -= 1; |
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369 |
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370 MemRegion mr = _base[_index]; |
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371 if (mr.start() != NULL) { |
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372 assert(mr.end() != NULL, "invariant"); |
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373 assert(mr.word_size() > 0, "invariant"); |
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374 return mr; |
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375 } else { |
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376 // that entry was invalidated... let's skip it |
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377 assert(mr.end() == NULL, "invariant"); |
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378 } |
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379 } |
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380 } |
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381 #endif |
| 342 | 382 |
| 383 bool CMRegionStack::invalidate_entries_into_cset() { | |
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384 guarantee(false, "invalidate_entries_into_cset(): don't call this any more"); |
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385 |
| 342 | 386 bool result = false; |
| 387 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 388 for (int i = 0; i < _oops_do_bound; ++i) { | |
| 389 MemRegion mr = _base[i]; | |
| 390 if (mr.start() != NULL) { | |
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391 assert(mr.end() != NULL, "invariant"); |
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392 assert(mr.word_size() > 0, "invariant"); |
| 342 | 393 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
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394 assert(hr != NULL, "invariant"); |
| 342 | 395 if (hr->in_collection_set()) { |
| 396 // The region points into the collection set | |
| 397 _base[i] = MemRegion(); | |
| 398 result = true; | |
| 399 } | |
| 400 } else { | |
| 401 // that entry was invalidated... let's skip it | |
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402 assert(mr.end() == NULL, "invariant"); |
| 342 | 403 } |
| 404 } | |
| 405 return result; | |
| 406 } | |
| 407 | |
| 408 template<class OopClosureClass> | |
| 409 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 410 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 411 || SafepointSynchronize::is_at_safepoint(), | |
| 412 "Drain recursion must be yield-safe."); | |
| 413 bool res = true; | |
| 414 debug_only(_drain_in_progress = true); | |
| 415 debug_only(_drain_in_progress_yields = yield_after); | |
| 416 while (!isEmpty()) { | |
| 417 oop newOop = pop(); | |
| 418 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 419 assert(newOop->is_oop(), "Expected an oop"); | |
| 420 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 421 "only grey objects on this stack"); | |
| 422 newOop->oop_iterate(cl); | |
| 423 if (yield_after && _cm->do_yield_check()) { | |
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424 res = false; |
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425 break; |
| 342 | 426 } |
| 427 } | |
| 428 debug_only(_drain_in_progress = false); | |
| 429 return res; | |
| 430 } | |
| 431 | |
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432 void CMMarkStack::note_start_of_gc() { |
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433 assert(_saved_index == -1, |
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434 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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435 _saved_index = _index; |
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436 } |
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437 |
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438 void CMMarkStack::note_end_of_gc() { |
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439 // This is intentionally a guarantee, instead of an assert. If we |
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440 // accidentally add something to the mark stack during GC, it |
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441 // will be a correctness issue so it's better if we crash. we'll |
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442 // only check this once per GC anyway, so it won't be a performance |
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443 // issue in any way. |
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444 guarantee(_saved_index == _index, |
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445 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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446 _saved_index = -1; |
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447 } |
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448 |
| 342 | 449 void CMMarkStack::oops_do(OopClosure* f) { |
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450 assert(_saved_index == _index, |
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451 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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452 for (int i = 0; i < _index; i += 1) { |
| 342 | 453 f->do_oop(&_base[i]); |
| 454 } | |
| 455 } | |
| 456 | |
| 457 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
| 458 return (_g1h->is_obj_ill(obj) | |
| 459 || (_g1h->is_in_permanent(obj) | |
| 460 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
| 461 } | |
| 462 | |
| 463 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 464 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 465 #endif // _MSC_VER | |
| 466 | |
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467 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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468 return MAX2((n_par_threads + 2) / 4, 1U); |
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469 } |
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470 |
| 342 | 471 ConcurrentMark::ConcurrentMark(ReservedSpace rs, |
| 472 int max_regions) : | |
| 473 _markBitMap1(rs, MinObjAlignment - 1), | |
| 474 _markBitMap2(rs, MinObjAlignment - 1), | |
| 475 | |
| 476 _parallel_marking_threads(0), | |
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477 _max_parallel_marking_threads(0), |
| 342 | 478 _sleep_factor(0.0), |
| 479 _marking_task_overhead(1.0), | |
| 480 _cleanup_sleep_factor(0.0), | |
| 481 _cleanup_task_overhead(1.0), | |
| 2152 | 482 _cleanup_list("Cleanup List"), |
| 342 | 483 _region_bm(max_regions, false /* in_resource_area*/), |
| 484 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
| 485 CardTableModRefBS::card_shift, | |
| 486 false /* in_resource_area*/), | |
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487 |
| 342 | 488 _prevMarkBitMap(&_markBitMap1), |
| 489 _nextMarkBitMap(&_markBitMap2), | |
| 490 _at_least_one_mark_complete(false), | |
| 491 | |
| 492 _markStack(this), | |
| 493 _regionStack(), | |
| 494 // _finger set in set_non_marking_state | |
| 495 | |
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496 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 497 // _active_tasks set in set_non_marking_state |
| 498 // _tasks set inside the constructor | |
| 499 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
| 500 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
| 501 | |
| 502 _has_overflown(false), | |
| 503 _concurrent(false), | |
|
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504 _has_aborted(false), |
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505 _restart_for_overflow(false), |
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506 _concurrent_marking_in_progress(false), |
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507 _should_gray_objects(false), |
| 342 | 508 |
| 509 // _verbose_level set below | |
| 510 | |
| 511 _init_times(), | |
| 512 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 513 _cleanup_times(), | |
| 514 _total_counting_time(0.0), | |
| 515 _total_rs_scrub_time(0.0), | |
|
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516 |
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517 _parallel_workers(NULL), |
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518 |
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519 _count_card_bitmaps(NULL), |
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520 _count_marked_bytes(NULL) { |
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521 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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522 if (verbose_level < no_verbose) { |
| 342 | 523 verbose_level = no_verbose; |
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524 } |
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525 if (verbose_level > high_verbose) { |
| 342 | 526 verbose_level = high_verbose; |
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527 } |
| 342 | 528 _verbose_level = verbose_level; |
| 529 | |
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530 if (verbose_low()) { |
| 342 | 531 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
| 532 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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533 } |
| 342 | 534 |
| 1284 | 535 _markStack.allocate(MarkStackSize); |
| 751 | 536 _regionStack.allocate(G1MarkRegionStackSize); |
| 342 | 537 |
| 538 // Create & start a ConcurrentMark thread. | |
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539 _cmThread = new ConcurrentMarkThread(this); |
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540 assert(cmThread() != NULL, "CM Thread should have been created"); |
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541 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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542 |
| 342 | 543 _g1h = G1CollectedHeap::heap(); |
| 544 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
| 545 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
| 546 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
| 547 | |
| 548 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 549 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 550 |
| 551 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
| 552 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
| 553 | |
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554 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_task_num); |
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555 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_task_num); |
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556 |
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557 BitMap::idx_t card_bm_size = _card_bm.size(); |
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558 |
| 342 | 559 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
| 560 _active_tasks = _max_task_num; | |
| 561 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 562 CMTaskQueue* task_queue = new CMTaskQueue(); | |
| 563 task_queue->initialize(); | |
| 564 _task_queues->register_queue(i, task_queue); | |
| 565 | |
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566 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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567 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions); |
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568 |
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569 _tasks[i] = new CMTask(i, this, |
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570 _count_marked_bytes[i], |
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571 &_count_card_bitmaps[i], |
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572 task_queue, _task_queues); |
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573 |
| 342 | 574 _accum_task_vtime[i] = 0.0; |
| 575 } | |
| 576 | |
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577 // Calculate the card number for the bottom of the heap. Used |
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578 // in biasing indexes into the accounting card bitmaps. |
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579 _heap_bottom_card_num = |
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580 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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581 CardTableModRefBS::card_shift); |
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582 |
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583 // Clear all the liveness counting data |
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584 clear_all_count_data(); |
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585 |
| 1284 | 586 if (ConcGCThreads > ParallelGCThreads) { |
| 587 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
| 342 | 588 "than ParallelGCThreads."); |
| 589 } | |
| 590 if (ParallelGCThreads == 0) { | |
| 591 // if we are not running with any parallel GC threads we will not | |
| 592 // spawn any marking threads either | |
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593 _parallel_marking_threads = 0; |
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594 _max_parallel_marking_threads = 0; |
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595 _sleep_factor = 0.0; |
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596 _marking_task_overhead = 1.0; |
| 342 | 597 } else { |
| 1284 | 598 if (ConcGCThreads > 0) { |
| 599 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
| 342 | 600 // if both are set |
| 601 | |
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602 _parallel_marking_threads = (uint) ConcGCThreads; |
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603 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 604 _sleep_factor = 0.0; |
| 605 _marking_task_overhead = 1.0; | |
| 751 | 606 } else if (G1MarkingOverheadPercent > 0) { |
| 342 | 607 // we will calculate the number of parallel marking threads |
| 608 // based on a target overhead with respect to the soft real-time | |
| 609 // goal | |
| 610 | |
| 751 | 611 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 612 double overall_cm_overhead = |
| 751 | 613 (double) MaxGCPauseMillis * marking_overhead / |
| 614 (double) GCPauseIntervalMillis; | |
| 342 | 615 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 616 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 617 double marking_task_overhead = | |
| 618 overall_cm_overhead / marking_thread_num * | |
| 619 (double) os::processor_count(); | |
| 620 double sleep_factor = | |
| 621 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 622 | |
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623 _parallel_marking_threads = (uint) marking_thread_num; |
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624 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 625 _sleep_factor = sleep_factor; |
| 626 _marking_task_overhead = marking_task_overhead; | |
| 627 } else { | |
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628 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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629 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 630 _sleep_factor = 0.0; |
| 631 _marking_task_overhead = 1.0; | |
| 632 } | |
| 633 | |
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634 if (parallel_marking_threads() > 1) { |
| 342 | 635 _cleanup_task_overhead = 1.0; |
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636 } else { |
| 342 | 637 _cleanup_task_overhead = marking_task_overhead(); |
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638 } |
| 342 | 639 _cleanup_sleep_factor = |
| 640 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 641 | |
| 642 #if 0 | |
| 643 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 644 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 645 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 646 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 647 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 648 #endif | |
| 649 | |
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650 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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651 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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652 _max_parallel_marking_threads, false, true); |
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653 if (_parallel_workers == NULL) { |
| 342 | 654 vm_exit_during_initialization("Failed necessary allocation."); |
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655 } else { |
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656 _parallel_workers->initialize_workers(); |
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657 } |
| 342 | 658 } |
| 659 | |
| 660 // so that the call below can read a sensible value | |
| 661 _heap_start = (HeapWord*) rs.base(); | |
| 662 set_non_marking_state(); | |
| 663 } | |
| 664 | |
| 665 void ConcurrentMark::update_g1_committed(bool force) { | |
| 666 // If concurrent marking is not in progress, then we do not need to | |
| 667 // update _heap_end. This has a subtle and important | |
| 668 // side-effect. Imagine that two evacuation pauses happen between | |
| 669 // marking completion and remark. The first one can grow the | |
| 670 // heap (hence now the finger is below the heap end). Then, the | |
| 671 // second one could unnecessarily push regions on the region | |
| 672 // stack. This causes the invariant that the region stack is empty | |
| 673 // at the beginning of remark to be false. By ensuring that we do | |
| 674 // not observe heap expansions after marking is complete, then we do | |
| 675 // not have this problem. | |
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676 if (!concurrent_marking_in_progress() && !force) return; |
| 342 | 677 |
| 678 MemRegion committed = _g1h->g1_committed(); | |
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679 assert(committed.start() == _heap_start, "start shouldn't change"); |
| 342 | 680 HeapWord* new_end = committed.end(); |
| 681 if (new_end > _heap_end) { | |
| 682 // The heap has been expanded. | |
| 683 | |
| 684 _heap_end = new_end; | |
| 685 } | |
| 686 // Notice that the heap can also shrink. However, this only happens | |
| 687 // during a Full GC (at least currently) and the entire marking | |
| 688 // phase will bail out and the task will not be restarted. So, let's | |
| 689 // do nothing. | |
| 690 } | |
| 691 | |
| 692 void ConcurrentMark::reset() { | |
| 693 // Starting values for these two. This should be called in a STW | |
| 694 // phase. CM will be notified of any future g1_committed expansions | |
| 695 // will be at the end of evacuation pauses, when tasks are | |
| 696 // inactive. | |
| 697 MemRegion committed = _g1h->g1_committed(); | |
| 698 _heap_start = committed.start(); | |
| 699 _heap_end = committed.end(); | |
| 700 | |
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701 // Separated the asserts so that we know which one fires. |
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702 assert(_heap_start != NULL, "heap bounds should look ok"); |
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703 assert(_heap_end != NULL, "heap bounds should look ok"); |
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704 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 705 |
| 706 // reset all the marking data structures and any necessary flags | |
| 707 clear_marking_state(); | |
| 708 | |
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709 if (verbose_low()) { |
| 342 | 710 gclog_or_tty->print_cr("[global] resetting"); |
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711 } |
| 342 | 712 |
| 713 // We do reset all of them, since different phases will use | |
| 714 // different number of active threads. So, it's easiest to have all | |
| 715 // of them ready. | |
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716 for (int i = 0; i < (int) _max_task_num; ++i) { |
| 342 | 717 _tasks[i]->reset(_nextMarkBitMap); |
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718 } |
| 342 | 719 |
| 720 // we need this to make sure that the flag is on during the evac | |
| 721 // pause with initial mark piggy-backed | |
| 722 set_concurrent_marking_in_progress(); | |
| 723 } | |
| 724 | |
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725 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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726 assert(active_tasks <= _max_task_num, "we should not have more"); |
| 342 | 727 |
| 728 _active_tasks = active_tasks; | |
| 729 // Need to update the three data structures below according to the | |
| 730 // number of active threads for this phase. | |
| 731 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 732 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 733 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 734 | |
| 735 _concurrent = concurrent; | |
| 736 // We propagate this to all tasks, not just the active ones. | |
| 737 for (int i = 0; i < (int) _max_task_num; ++i) | |
| 738 _tasks[i]->set_concurrent(concurrent); | |
| 739 | |
| 740 if (concurrent) { | |
| 741 set_concurrent_marking_in_progress(); | |
| 742 } else { | |
| 743 // We currently assume that the concurrent flag has been set to | |
| 744 // false before we start remark. At this point we should also be | |
| 745 // in a STW phase. | |
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746 assert(!concurrent_marking_in_progress(), "invariant"); |
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747 assert(_finger == _heap_end, "only way to get here"); |
| 342 | 748 update_g1_committed(true); |
| 749 } | |
| 750 } | |
| 751 | |
| 752 void ConcurrentMark::set_non_marking_state() { | |
| 753 // We set the global marking state to some default values when we're | |
| 754 // not doing marking. | |
| 755 clear_marking_state(); | |
| 756 _active_tasks = 0; | |
| 757 clear_concurrent_marking_in_progress(); | |
| 758 } | |
| 759 | |
| 760 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 761 // The ConcurrentMark instance is never freed. |
| 762 ShouldNotReachHere(); | |
| 342 | 763 } |
| 764 | |
| 765 void ConcurrentMark::clearNextBitmap() { | |
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766 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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767 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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768 |
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769 // Make sure that the concurrent mark thread looks to still be in |
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770 // the current cycle. |
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771 guarantee(cmThread()->during_cycle(), "invariant"); |
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772 |
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773 // We are finishing up the current cycle by clearing the next |
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774 // marking bitmap and getting it ready for the next cycle. During |
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775 // this time no other cycle can start. So, let's make sure that this |
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776 // is the case. |
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777 guarantee(!g1h->mark_in_progress(), "invariant"); |
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778 |
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779 // clear the mark bitmap (no grey objects to start with). |
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780 // We need to do this in chunks and offer to yield in between |
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781 // each chunk. |
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782 HeapWord* start = _nextMarkBitMap->startWord(); |
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783 HeapWord* end = _nextMarkBitMap->endWord(); |
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784 HeapWord* cur = start; |
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785 size_t chunkSize = M; |
|
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786 while (cur < end) { |
|
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787 HeapWord* next = cur + chunkSize; |
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788 if (next > end) { |
|
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789 next = end; |
|
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790 } |
|
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791 MemRegion mr(cur,next); |
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792 _nextMarkBitMap->clearRange(mr); |
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793 cur = next; |
|
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794 do_yield_check(); |
|
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795 |
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796 // Repeat the asserts from above. We'll do them as asserts here to |
|
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797 // minimize their overhead on the product. However, we'll have |
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798 // them as guarantees at the beginning / end of the bitmap |
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799 // clearing to get some checking in the product. |
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800 assert(cmThread()->during_cycle(), "invariant"); |
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801 assert(!g1h->mark_in_progress(), "invariant"); |
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802 } |
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803 |
|
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804 // Clear the liveness counting data |
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805 clear_all_count_data(); |
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806 |
|
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807 // Repeat the asserts from above. |
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808 guarantee(cmThread()->during_cycle(), "invariant"); |
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809 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 810 } |
| 811 | |
| 812 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
| 813 public: | |
| 814 bool doHeapRegion(HeapRegion* r) { | |
| 815 if (!r->continuesHumongous()) { | |
|
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816 r->note_start_of_marking(); |
| 342 | 817 } |
| 818 return false; | |
| 819 } | |
| 820 }; | |
| 821 | |
| 822 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 823 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 824 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 825 | |
| 826 _has_aborted = false; | |
| 827 | |
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828 #ifndef PRODUCT |
| 1044 | 829 if (G1PrintReachableAtInitialMark) { |
| 1388 | 830 print_reachable("at-cycle-start", |
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831 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 832 } |
|
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833 #endif |
| 342 | 834 |
| 835 // Initialise marking structures. This has to be done in a STW phase. | |
| 836 reset(); | |
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837 |
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838 // For each region note start of marking. |
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839 NoteStartOfMarkHRClosure startcl; |
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840 g1h->heap_region_iterate(&startcl); |
| 342 | 841 } |
| 842 | |
| 843 | |
| 844 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 845 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 846 | |
|
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847 // If we force an overflow during remark, the remark operation will |
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848 // actually abort and we'll restart concurrent marking. If we always |
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849 // force an oveflow during remark we'll never actually complete the |
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850 // marking phase. So, we initilize this here, at the start of the |
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851 // cycle, so that at the remaining overflow number will decrease at |
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852 // every remark and we'll eventually not need to cause one. |
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853 force_overflow_stw()->init(); |
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854 |
|
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855 // Start Concurrent Marking weak-reference discovery. |
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856 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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857 // enable ("weak") refs discovery |
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858 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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859 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 860 |
| 861 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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862 // This is the start of the marking cycle, we're expected all |
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863 // threads to have SATB queues with active set to false. |
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864 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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865 false /* expected_active */); |
| 342 | 866 |
| 867 // update_g1_committed() will be called at the end of an evac pause | |
| 868 // when marking is on. So, it's also called at the end of the | |
| 869 // initial-mark pause to update the heap end, if the heap expands | |
| 870 // during it. No need to call it here. | |
| 871 } | |
| 872 | |
| 873 /* | |
|
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874 * Notice that in the next two methods, we actually leave the STS |
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875 * during the barrier sync and join it immediately afterwards. If we |
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876 * do not do this, the following deadlock can occur: one thread could |
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877 * be in the barrier sync code, waiting for the other thread to also |
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878 * sync up, whereas another one could be trying to yield, while also |
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879 * waiting for the other threads to sync up too. |
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880 * |
|
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881 * Note, however, that this code is also used during remark and in |
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882 * this case we should not attempt to leave / enter the STS, otherwise |
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883 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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884 * (product). So we should only leave / enter the STS if we are |
|
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885 * operating concurrently. |
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886 * |
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887 * Because the thread that does the sync barrier has left the STS, it |
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888 * is possible to be suspended for a Full GC or an evacuation pause |
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889 * could occur. This is actually safe, since the entering the sync |
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890 * barrier is one of the last things do_marking_step() does, and it |
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891 * doesn't manipulate any data structures afterwards. |
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892 */ |
| 342 | 893 |
| 894 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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895 if (verbose_low()) { |
| 342 | 896 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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897 } |
| 342 | 898 |
|
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899 if (concurrent()) { |
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900 ConcurrentGCThread::stsLeave(); |
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901 } |
| 342 | 902 _first_overflow_barrier_sync.enter(); |
|
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903 if (concurrent()) { |
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904 ConcurrentGCThread::stsJoin(); |
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905 } |
| 342 | 906 // at this point everyone should have synced up and not be doing any |
| 907 // more work | |
| 908 | |
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909 if (verbose_low()) { |
| 342 | 910 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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911 } |
| 342 | 912 |
| 913 // let task 0 do this | |
| 914 if (task_num == 0) { | |
| 915 // task 0 is responsible for clearing the global data structures | |
|
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916 // We should be here because of an overflow. During STW we should |
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917 // not clear the overflow flag since we rely on it being true when |
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918 // we exit this method to abort the pause and restart concurent |
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919 // marking. |
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920 clear_marking_state(concurrent() /* clear_overflow */); |
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921 force_overflow()->update(); |
| 342 | 922 |
| 923 if (PrintGC) { | |
| 924 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
| 925 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 926 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
| 927 } | |
| 928 } | |
| 929 | |
| 930 // after this, each task should reset its own data structures then | |
| 931 // then go into the second barrier | |
| 932 } | |
| 933 | |
| 934 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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935 if (verbose_low()) { |
| 342 | 936 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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937 } |
| 342 | 938 |
|
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939 if (concurrent()) { |
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940 ConcurrentGCThread::stsLeave(); |
|
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941 } |
| 342 | 942 _second_overflow_barrier_sync.enter(); |
|
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943 if (concurrent()) { |
|
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944 ConcurrentGCThread::stsJoin(); |
|
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945 } |
| 342 | 946 // at this point everything should be re-initialised and ready to go |
| 947 | |
|
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948 if (verbose_low()) { |
| 342 | 949 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
|
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950 } |
| 342 | 951 } |
| 952 | |
|
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953 #ifndef PRODUCT |
|
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954 void ForceOverflowSettings::init() { |
|
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955 _num_remaining = G1ConcMarkForceOverflow; |
|
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956 _force = false; |
|
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957 update(); |
|
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958 } |
|
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959 |
|
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960 void ForceOverflowSettings::update() { |
|
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961 if (_num_remaining > 0) { |
|
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962 _num_remaining -= 1; |
|
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963 _force = true; |
|
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964 } else { |
|
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965 _force = false; |
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966 } |
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967 } |
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968 |
|
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969 bool ForceOverflowSettings::should_force() { |
|
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970 if (_force) { |
|
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971 _force = false; |
|
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972 return true; |
|
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973 } else { |
|
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974 return false; |
|
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975 } |
|
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976 } |
|
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977 #endif // !PRODUCT |
|
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978 |
| 342 | 979 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { |
|
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980 guarantee(false, "grayRegionIfNecessary(): don't call this any more"); |
|
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981 |
| 342 | 982 // The objects on the region have already been marked "in bulk" by |
| 983 // the caller. We only need to decide whether to push the region on | |
| 984 // the region stack or not. | |
| 985 | |
|
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986 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
| 342 | 987 // We're done with marking and waiting for remark. We do not need to |
| 988 // push anything else on the region stack. | |
| 989 return; | |
|
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990 } |
| 342 | 991 |
| 992 HeapWord* finger = _finger; | |
| 993 | |
|
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994 if (verbose_low()) { |
| 342 | 995 gclog_or_tty->print_cr("[global] attempting to push " |
| 996 "region ["PTR_FORMAT", "PTR_FORMAT"), finger is at " | |
| 997 PTR_FORMAT, mr.start(), mr.end(), finger); | |
|
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998 } |
| 342 | 999 |
| 1000 if (mr.start() < finger) { | |
| 1001 // The finger is always heap region aligned and it is not possible | |
| 1002 // for mr to span heap regions. | |
|
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1003 assert(mr.end() <= finger, "invariant"); |
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1004 |
|
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1005 // Separated the asserts so that we know which one fires. |
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1006 assert(mr.start() <= mr.end(), |
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1007 "region boundaries should fall within the committed space"); |
|
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1008 assert(_heap_start <= mr.start(), |
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1009 "region boundaries should fall within the committed space"); |
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1010 assert(mr.end() <= _heap_end, |
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1011 "region boundaries should fall within the committed space"); |
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1012 if (verbose_low()) { |
| 342 | 1013 gclog_or_tty->print_cr("[global] region ["PTR_FORMAT", "PTR_FORMAT") " |
| 1014 "below the finger, pushing it", | |
| 1015 mr.start(), mr.end()); | |
|
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1016 } |
| 342 | 1017 |
|
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1018 if (!region_stack_push_lock_free(mr)) { |
|
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1019 if (verbose_low()) { |
| 342 | 1020 gclog_or_tty->print_cr("[global] region stack has overflown."); |
|
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1021 } |
| 342 | 1022 } |
| 1023 } | |
| 1024 } | |
| 1025 | |
| 1026 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
|
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1027 guarantee(false, "markAndGrayObjectIfNecessary(): don't call this any more"); |
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1028 |
| 342 | 1029 // The object is not marked by the caller. We need to at least mark |
| 1030 // it and maybe push in on the stack. | |
| 1031 | |
| 1032 HeapWord* addr = (HeapWord*)p; | |
| 1033 if (!_nextMarkBitMap->isMarked(addr)) { | |
| 1034 // We definitely need to mark it, irrespective whether we bail out | |
| 1035 // because we're done with marking. | |
| 1036 if (_nextMarkBitMap->parMark(addr)) { | |
|
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1037 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
| 342 | 1038 // If we're done with concurrent marking and we're waiting for |
| 1039 // remark, then we're not pushing anything on the stack. | |
| 1040 return; | |
|
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1041 } |
| 342 | 1042 |
| 1043 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 1044 // CAS done in parMark(addr) above | |
| 1045 HeapWord* finger = _finger; | |
| 1046 | |
| 1047 if (addr < finger) { | |
| 1048 if (!mark_stack_push(oop(addr))) { | |
|
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1049 if (verbose_low()) { |
| 342 | 1050 gclog_or_tty->print_cr("[global] global stack overflow " |
| 1051 "during parMark"); | |
|
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1052 } |
| 342 | 1053 } |
| 1054 } | |
| 1055 } | |
| 1056 } | |
| 1057 } | |
| 1058 | |
| 1059 class CMConcurrentMarkingTask: public AbstractGangTask { | |
| 1060 private: | |
| 1061 ConcurrentMark* _cm; | |
| 1062 ConcurrentMarkThread* _cmt; | |
| 1063 | |
| 1064 public: | |
|
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1065 void work(uint worker_id) { |
|
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1066 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1067 "this should only be done by a conc GC thread"); |
|
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1068 ResourceMark rm; |
| 342 | 1069 |
| 1070 double start_vtime = os::elapsedVTime(); | |
| 1071 | |
| 1072 ConcurrentGCThread::stsJoin(); | |
| 1073 | |
|
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1074 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1075 CMTask* the_task = _cm->task(worker_id); |
| 342 | 1076 the_task->record_start_time(); |
| 1077 if (!_cm->has_aborted()) { | |
| 1078 do { | |
| 1079 double start_vtime_sec = os::elapsedVTime(); | |
| 1080 double start_time_sec = os::elapsedTime(); | |
|
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1081 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1082 |
|
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1083 the_task->do_marking_step(mark_step_duration_ms, |
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1084 true /* do_stealing */, |
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1085 true /* do_termination */); |
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1086 |
| 342 | 1087 double end_time_sec = os::elapsedTime(); |
| 1088 double end_vtime_sec = os::elapsedVTime(); | |
| 1089 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 1090 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 1091 _cm->clear_has_overflown(); | |
| 1092 | |
|
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1093 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 1094 |
| 1095 jlong sleep_time_ms; | |
| 1096 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 1097 sleep_time_ms = | |
| 1098 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 1099 ConcurrentGCThread::stsLeave(); | |
| 1100 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 1101 ConcurrentGCThread::stsJoin(); | |
| 1102 } | |
| 1103 double end_time2_sec = os::elapsedTime(); | |
| 1104 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 1105 | |
| 1106 #if 0 | |
| 1107 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 1108 "overhead %1.4lf", | |
| 1109 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 1110 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 1111 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 1112 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 1113 #endif | |
| 1114 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 1115 } | |
| 1116 the_task->record_end_time(); | |
|
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1117 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 1118 |
| 1119 ConcurrentGCThread::stsLeave(); | |
| 1120 | |
| 1121 double end_vtime = os::elapsedVTime(); | |
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1122 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 1123 } |
| 1124 | |
| 1125 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 1126 ConcurrentMarkThread* cmt) : | |
| 1127 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 1128 | |
| 1129 ~CMConcurrentMarkingTask() { } | |
| 1130 }; | |
| 1131 | |
|
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1132 // Calculates the number of active workers for a concurrent |
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1133 // phase. |
|
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1134 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 1135 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1136 uint n_conc_workers = 0; |
|
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1137 if (!UseDynamicNumberOfGCThreads || |
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1138 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1139 !ForceDynamicNumberOfGCThreads)) { |
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1140 n_conc_workers = max_parallel_marking_threads(); |
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1141 } else { |
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1142 n_conc_workers = |
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1143 AdaptiveSizePolicy::calc_default_active_workers( |
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1144 max_parallel_marking_threads(), |
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1145 1, /* Minimum workers */ |
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1146 parallel_marking_threads(), |
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1147 Threads::number_of_non_daemon_threads()); |
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1148 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1149 // that scaling has already gone into "_max_parallel_marking_threads". |
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1150 } |
| 4711 | 1151 assert(n_conc_workers > 0, "Always need at least 1"); |
| 1152 return n_conc_workers; | |
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1153 } |
| 4711 | 1154 // If we are not running with any parallel GC threads we will not |
| 1155 // have spawned any marking threads either. Hence the number of | |
| 1156 // concurrent workers should be 0. | |
| 1157 return 0; | |
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1158 } |
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1159 |
| 342 | 1160 void ConcurrentMark::markFromRoots() { |
| 1161 // we might be tempted to assert that: | |
| 1162 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1163 // "inconsistent argument?"); | |
| 1164 // However that wouldn't be right, because it's possible that | |
| 1165 // a safepoint is indeed in progress as a younger generation | |
| 1166 // stop-the-world GC happens even as we mark in this generation. | |
| 1167 | |
| 1168 _restart_for_overflow = false; | |
|
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1169 force_overflow_conc()->init(); |
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1170 |
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1171 // _g1h has _n_par_threads |
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1172 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1173 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1174 "Maximum number of marking threads exceeded"); |
| 4711 | 1175 |
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1176 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1177 |
| 1178 // Parallel task terminator is set in "set_phase()" | |
| 1179 set_phase(active_workers, true /* concurrent */); | |
| 342 | 1180 |
| 1181 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1182 if (parallel_marking_threads() > 0) { |
| 4711 | 1183 _parallel_workers->set_active_workers((int)active_workers); |
| 1184 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
| 1185 // and the decisions on that MT processing is made elsewhere. | |
| 1186 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1187 _parallel_workers->run_task(&markingTask); |
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1188 } else { |
| 342 | 1189 markingTask.work(0); |
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1190 } |
| 342 | 1191 print_stats(); |
| 1192 } | |
| 1193 | |
| 1194 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1195 // world is stopped at this checkpoint | |
| 1196 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1197 "world should be stopped"); | |
|
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1198 |
| 342 | 1199 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1200 | |
| 1201 // If a full collection has happened, we shouldn't do this. | |
| 1202 if (has_aborted()) { | |
| 1203 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1204 return; | |
| 1205 } | |
| 1206 | |
|
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1207 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1208 |
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1209 if (VerifyDuringGC) { |
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1210 HandleMark hm; // handle scope |
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1211 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1212 Universe::heap()->prepare_for_verify(); |
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1213 Universe::verify(/* allow dirty */ true, |
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1214 /* silent */ false, |
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1215 /* option */ VerifyOption_G1UsePrevMarking); |
|
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1216 } |
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1217 |
| 342 | 1218 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1219 g1p->record_concurrent_mark_remark_start(); | |
| 1220 | |
| 1221 double start = os::elapsedTime(); | |
| 1222 | |
| 1223 checkpointRootsFinalWork(); | |
| 1224 | |
| 1225 double mark_work_end = os::elapsedTime(); | |
| 1226 | |
| 1227 weakRefsWork(clear_all_soft_refs); | |
| 1228 | |
| 1229 if (has_overflown()) { | |
| 1230 // Oops. We overflowed. Restart concurrent marking. | |
| 1231 _restart_for_overflow = true; | |
| 1232 // Clear the flag. We do not need it any more. | |
| 1233 clear_has_overflown(); | |
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1234 if (G1TraceMarkStackOverflow) { |
| 342 | 1235 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1236 } |
| 342 | 1237 } else { |
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1238 // Aggregate the per-task counting data that we have accumulated |
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1239 // while marking. |
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1240 aggregate_count_data(); |
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1241 |
| 2149 | 1242 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1243 // We're done with marking. |
|
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1244 // This is the end of the marking cycle, we're expected all |
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1245 // threads to have SATB queues with active set to true. |
| 2149 | 1246 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1247 true /* expected_active */); | |
| 811 | 1248 |
| 1249 if (VerifyDuringGC) { | |
|
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1250 HandleMark hm; // handle scope |
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1251 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1252 Universe::heap()->prepare_for_verify(); |
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1253 Universe::verify(/* allow dirty */ true, |
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1254 /* silent */ false, |
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1255 /* option */ VerifyOption_G1UseNextMarking); |
| 811 | 1256 } |
|
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1257 assert(!restart_for_overflow(), "sanity"); |
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1258 } |
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1259 |
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1260 // Reset the marking state if marking completed |
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1261 if (!restart_for_overflow()) { |
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1262 set_non_marking_state(); |
| 342 | 1263 } |
| 1264 | |
| 1265 #if VERIFY_OBJS_PROCESSED | |
| 1266 _scan_obj_cl.objs_processed = 0; | |
| 1267 ThreadLocalObjQueue::objs_enqueued = 0; | |
| 1268 #endif | |
| 1269 | |
| 1270 // Statistics | |
| 1271 double now = os::elapsedTime(); | |
| 1272 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1273 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1274 _remark_times.add((now - start) * 1000.0); | |
| 1275 | |
| 1276 g1p->record_concurrent_mark_remark_end(); | |
| 1277 } | |
| 1278 | |
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1279 // Used to calculate the # live objects per region |
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1280 // for verification purposes |
| 342 | 1281 class CalcLiveObjectsClosure: public HeapRegionClosure { |
| 1282 | |
| 1283 CMBitMapRO* _bm; | |
| 1284 ConcurrentMark* _cm; | |
| 1285 BitMap* _region_bm; | |
| 1286 BitMap* _card_bm; | |
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1287 |
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1288 // Debugging |
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1289 size_t _tot_words_done; |
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1290 size_t _tot_live; |
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1291 size_t _tot_used; |
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1292 |
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1293 size_t _region_marked_bytes; |
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1294 |
| 342 | 1295 intptr_t _bottom_card_num; |
| 1296 | |
| 1297 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
|
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1298 assert(start_card_num <= last_card_num, "sanity"); |
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1299 BitMap::idx_t start_idx = start_card_num - _bottom_card_num; |
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1300 BitMap::idx_t last_idx = last_card_num - _bottom_card_num; |
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1301 |
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1302 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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1303 _card_bm->par_at_put(i, 1); |
| 342 | 1304 } |
| 1305 } | |
| 1306 | |
| 1307 public: | |
|
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1308 CalcLiveObjectsClosure(CMBitMapRO *bm, ConcurrentMark *cm, |
| 936 | 1309 BitMap* region_bm, BitMap* card_bm) : |
|
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1310 _bm(bm), _cm(cm), _region_bm(region_bm), _card_bm(card_bm), |
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1311 _region_marked_bytes(0), _tot_words_done(0), |
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1312 _tot_live(0), _tot_used(0), |
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1313 _bottom_card_num(cm->heap_bottom_card_num()) { } |
| 342 | 1314 |
| 829 | 1315 // It takes a region that's not empty (i.e., it has at least one |
| 1316 // live object in it and sets its corresponding bit on the region | |
| 1317 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1318 // to 1 the bits on the region bitmap that correspond to its | |
| 1319 // associated "continues humongous" regions. | |
| 1320 void set_bit_for_region(HeapRegion* hr) { | |
| 1321 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1322 | |
| 1323 size_t index = hr->hrs_index(); | |
| 1324 if (!hr->startsHumongous()) { | |
| 1325 // Normal (non-humongous) case: just set the bit. | |
| 1326 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
| 1327 } else { | |
| 1328 // Starts humongous case: calculate how many regions are part of | |
|
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1329 // this humongous region and then set the bit range. |
| 829 | 1330 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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1331 HeapRegion *last_hr = g1h->heap_region_containing_raw(hr->end() - 1); |
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1332 size_t end_index = last_hr->hrs_index() + 1; |
| 829 | 1333 _region_bm->par_at_put_range((BitMap::idx_t) index, |
| 1334 (BitMap::idx_t) end_index, true); | |
| 1335 } | |
| 1336 } | |
| 1337 | |
| 342 | 1338 bool doHeapRegion(HeapRegion* hr) { |
| 1339 | |
| 639 | 1340 if (hr->continuesHumongous()) { |
| 829 | 1341 // We will ignore these here and process them when their |
| 1342 // associated "starts humongous" region is processed (see | |
| 1343 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1344 // associated "starts humongous" region to have their bit set to | |
| 1345 // 1 since, due to the region chunking in the parallel region | |
| 1346 // iteration, a "continues humongous" region might be visited | |
| 1347 // before its associated "starts humongous". | |
| 639 | 1348 return false; |
| 1349 } | |
| 342 | 1350 |
| 1351 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
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1352 HeapWord* start = hr->bottom(); |
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1353 |
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1354 assert(start <= hr->end() && start <= nextTop && nextTop <= hr->end(), |
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1355 err_msg("Preconditions not met - " |
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1356 "start: "PTR_FORMAT", nextTop: "PTR_FORMAT", end: "PTR_FORMAT, |
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1357 start, nextTop, hr->end())); |
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1358 |
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1359 // Record the number of word's we'll examine. |
| 342 | 1360 size_t words_done = (nextTop - start); |
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1361 |
| 342 | 1362 // Find the first marked object at or after "start". |
| 1363 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
|
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1364 |
| 342 | 1365 size_t marked_bytes = 0; |
| 1366 | |
| 1367 // Below, the term "card num" means the result of shifting an address | |
| 1368 // by the card shift -- address 0 corresponds to card number 0. One | |
| 1369 // must subtract the card num of the bottom of the heap to obtain a | |
| 1370 // card table index. | |
|
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1371 |
| 342 | 1372 // The first card num of the sequence of live cards currently being |
| 1373 // constructed. -1 ==> no sequence. | |
| 1374 intptr_t start_card_num = -1; | |
|
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1375 |
| 342 | 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 oop obj = oop(start); | |
| 1382 int obj_sz = obj->size(); | |
|
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1383 |
| 342 | 1384 // The card num of the start of the current object. |
| 1385 intptr_t obj_card_num = | |
| 1386 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
| 1387 HeapWord* obj_last = start + obj_sz - 1; | |
| 1388 intptr_t obj_last_card_num = | |
| 1389 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
| 1390 | |
| 1391 if (obj_card_num != last_card_num) { | |
| 1392 if (start_card_num == -1) { | |
| 1393 assert(last_card_num == -1, "Both or neither."); | |
| 1394 start_card_num = obj_card_num; | |
| 1395 } else { | |
| 1396 assert(last_card_num != -1, "Both or neither."); | |
| 1397 assert(obj_card_num >= last_card_num, "Inv"); | |
| 1398 if ((obj_card_num - last_card_num) > 1) { | |
| 1399 // Mark the last run, and start a new one. | |
| 1400 mark_card_num_range(start_card_num, last_card_num); | |
| 1401 start_card_num = obj_card_num; | |
| 1402 } | |
| 1403 } | |
| 1404 } | |
| 1405 // In any case, we set the last card num. | |
| 1406 last_card_num = obj_last_card_num; | |
| 1407 | |
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1408 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1409 |
| 342 | 1410 // Find the next marked object after this one. |
| 1411 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
| 1412 } | |
|
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1413 |
| 342 | 1414 // Handle the last range, if any. |
|
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|
1415 if (start_card_num != -1) { |
| 342 | 1416 mark_card_num_range(start_card_num, last_card_num); |
|
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1417 } |
|
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|
1418 |
|
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1419 // Mark the allocated-since-marking portion... |
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1420 HeapWord* top = hr->top(); |
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1421 if (nextTop < top) { |
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1422 start_card_num = intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); |
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1423 last_card_num = intptr_t(uintptr_t(top) >> CardTableModRefBS::card_shift); |
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1424 |
|
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1425 mark_card_num_range(start_card_num, last_card_num); |
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1426 |
|
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1427 // This definitely means the region has live objects. |
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1428 set_bit_for_region(hr); |
| 342 | 1429 } |
| 1430 | |
| 1431 // Update the live region bitmap. | |
| 1432 if (marked_bytes > 0) { | |
| 829 | 1433 set_bit_for_region(hr); |
| 342 | 1434 } |
|
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1435 |
|
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1436 // Set the marked bytes for the current region so that |
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1437 // it can be queried by a calling verificiation routine |
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1438 _region_marked_bytes = marked_bytes; |
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1439 |
| 342 | 1440 _tot_live += hr->next_live_bytes(); |
| 1441 _tot_used += hr->used(); | |
|
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1442 _tot_words_done = words_done; |
| 342 | 1443 |
| 1444 return false; | |
| 1445 } | |
| 1446 | |
|
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1447 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1448 |
|
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|
1449 // Debugging |
|
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|
1450 size_t tot_words_done() const { return _tot_words_done; } |
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1451 size_t tot_live() const { return _tot_live; } |
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1452 size_t tot_used() const { return _tot_used; } |
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|
1453 }; |
|
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|
1454 |
|
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1455 // Heap region closure used for verifying the counting data |
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1456 // that was accumulated concurrently and aggregated during |
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1457 // the remark pause. This closure is applied to the heap |
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1458 // regions during the STW cleanup pause. |
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1459 |
|
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1460 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
|
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1461 ConcurrentMark* _cm; |
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1462 CalcLiveObjectsClosure _calc_cl; |
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1463 BitMap* _region_bm; // Region BM to be verified |
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1464 BitMap* _card_bm; // Card BM to be verified |
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1465 bool _verbose; // verbose output? |
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1466 |
|
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1467 BitMap* _exp_region_bm; // Expected Region BM values |
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1468 BitMap* _exp_card_bm; // Expected card BM values |
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|
1469 |
|
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1470 int _failures; |
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1471 |
|
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1472 public: |
|
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|
1473 VerifyLiveObjectDataHRClosure(ConcurrentMark* cm, |
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1474 BitMap* region_bm, |
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1475 BitMap* card_bm, |
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1476 BitMap* exp_region_bm, |
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1477 BitMap* exp_card_bm, |
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1478 bool verbose) : |
|
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1479 _cm(cm), |
|
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1480 _calc_cl(_cm->nextMarkBitMap(), _cm, exp_region_bm, exp_card_bm), |
|
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1481 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1482 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1483 _failures(0) { } |
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1484 |
|
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1485 int failures() const { return _failures; } |
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1486 |
|
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1487 bool doHeapRegion(HeapRegion* hr) { |
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1488 if (hr->continuesHumongous()) { |
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1489 // We will ignore these here and process them when their |
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1490 // associated "starts humongous" region is processed (see |
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1491 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1492 // associated "starts humongous" region to have their bit set to |
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1493 // 1 since, due to the region chunking in the parallel region |
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1494 // iteration, a "continues humongous" region might be visited |
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1495 // before its associated "starts humongous". |
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1496 return false; |
|
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1497 } |
|
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1498 |
|
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1499 int failures = 0; |
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1500 |
|
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|
1501 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1502 // this region and set the corresponding bits in the expected region |
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1503 // and card bitmaps. |
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1504 bool res = _calc_cl.doHeapRegion(hr); |
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1505 assert(res == false, "should be continuing"); |
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1506 |
|
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1507 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1508 Mutex::_no_safepoint_check_flag); |
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1509 |
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1510 // Verify that _top_at_conc_count == ntams |
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1511 if (hr->top_at_conc_mark_count() != hr->next_top_at_mark_start()) { |
|
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1512 if (_verbose) { |
|
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|
1513 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": top at conc count incorrect: " |
|
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1514 "expected " PTR_FORMAT ", actual: " PTR_FORMAT, |
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1515 hr->hrs_index(), hr->next_top_at_mark_start(), |
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|
1516 hr->top_at_conc_mark_count()); |
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|
1517 } |
|
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|
1518 failures += 1; |
|
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|
1519 } |
|
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|
1520 |
|
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|
1521 // Verify the marked bytes for this region. |
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1522 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1523 size_t act_marked_bytes = hr->next_marked_bytes(); |
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|
1524 |
|
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1525 // We're not OK if expected marked bytes > actual marked bytes. It means |
|
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|
1526 // we have missed accounting some objects during the actual marking. |
|
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|
1527 if (exp_marked_bytes > act_marked_bytes) { |
|
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changeset
|
1528 if (_verbose) { |
|
d30fa85f9994
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changeset
|
1529 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": marked bytes mismatch: " |
|
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changeset
|
1530 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
|
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changeset
|
1531 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
|
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|
1532 } |
|
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diff
changeset
|
1533 failures += 1; |
|
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diff
changeset
|
1534 } |
|
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diff
changeset
|
1535 |
|
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diff
changeset
|
1536 // Verify the bit, for this region, in the actual and expected |
|
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changeset
|
1537 // (which was just calculated) region bit maps. |
|
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|
1538 // We're not OK if the bit in the calculated expected region |
|
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|
1539 // bitmap is set and the bit in the actual region bitmap is not. |
|
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changeset
|
1540 BitMap::idx_t index = (BitMap::idx_t)hr->hrs_index(); |
|
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|
1541 |
|
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changeset
|
1542 bool expected = _exp_region_bm->at(index); |
|
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|
1543 bool actual = _region_bm->at(index); |
|
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|
1544 if (expected && !actual) { |
|
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|
1545 if (_verbose) { |
|
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changeset
|
1546 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": region bitmap mismatch: " |
|
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changeset
|
1547 "expected: %d, actual: %d", |
|
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changeset
|
1548 hr->hrs_index(), expected, actual); |
|
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changeset
|
1549 } |
|
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diff
changeset
|
1550 failures += 1; |
|
d30fa85f9994
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diff
changeset
|
1551 } |
|
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diff
changeset
|
1552 |
|
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changeset
|
1553 // Verify that the card bit maps for the cards spanned by the current |
|
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|
1554 // region match. We have an error if we have a set bit in the expected |
|
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|
1555 // bit map and the corresponding bit in the actual bitmap is not set. |
|
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|
1556 |
|
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changeset
|
1557 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
|
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|
1558 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
|
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|
1559 |
|
d30fa85f9994
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changeset
|
1560 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
|
d30fa85f9994
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changeset
|
1561 expected = _exp_card_bm->at(i); |
|
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changeset
|
1562 actual = _card_bm->at(i); |
|
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changeset
|
1563 |
|
d30fa85f9994
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diff
changeset
|
1564 if (expected && !actual) { |
|
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diff
changeset
|
1565 if (_verbose) { |
|
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changeset
|
1566 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": card bitmap mismatch at " SIZE_FORMAT ": " |
|
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diff
changeset
|
1567 "expected: %d, actual: %d", |
|
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changeset
|
1568 hr->hrs_index(), i, expected, actual); |
|
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changeset
|
1569 } |
|
d30fa85f9994
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diff
changeset
|
1570 failures += 1; |
|
d30fa85f9994
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parents:
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diff
changeset
|
1571 } |
|
d30fa85f9994
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diff
changeset
|
1572 } |
|
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diff
changeset
|
1573 |
|
d30fa85f9994
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changeset
|
1574 if (failures > 0 && _verbose) { |
|
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changeset
|
1575 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
|
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changeset
|
1576 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
|
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changeset
|
1577 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
|
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changeset
|
1578 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
|
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changeset
|
1579 } |
|
d30fa85f9994
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diff
changeset
|
1580 |
|
d30fa85f9994
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changeset
|
1581 _failures += failures; |
|
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diff
changeset
|
1582 |
|
d30fa85f9994
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diff
changeset
|
1583 // We could stop iteration over the heap when we |
|
d30fa85f9994
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changeset
|
1584 // find the first voilating region by returning true. |
|
d30fa85f9994
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diff
changeset
|
1585 return false; |
|
d30fa85f9994
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diff
changeset
|
1586 } |
| 342 | 1587 }; |
| 1588 | |
| 1589 | |
|
4836
d30fa85f9994
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|
1590 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
|
d30fa85f9994
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diff
changeset
|
1591 protected: |
|
d30fa85f9994
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diff
changeset
|
1592 G1CollectedHeap* _g1h; |
|
d30fa85f9994
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changeset
|
1593 ConcurrentMark* _cm; |
|
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changeset
|
1594 BitMap* _actual_region_bm; |
|
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diff
changeset
|
1595 BitMap* _actual_card_bm; |
|
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diff
changeset
|
1596 |
|
d30fa85f9994
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diff
changeset
|
1597 uint _n_workers; |
|
d30fa85f9994
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diff
changeset
|
1598 |
|
d30fa85f9994
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diff
changeset
|
1599 BitMap* _expected_region_bm; |
|
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changeset
|
1600 BitMap* _expected_card_bm; |
|
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changeset
|
1601 |
|
d30fa85f9994
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diff
changeset
|
1602 int _failures; |
|
d30fa85f9994
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diff
changeset
|
1603 bool _verbose; |
|
d30fa85f9994
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4830
diff
changeset
|
1604 |
|
d30fa85f9994
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diff
changeset
|
1605 public: |
|
d30fa85f9994
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diff
changeset
|
1606 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
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changeset
|
1607 BitMap* region_bm, BitMap* card_bm, |
|
d30fa85f9994
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4830
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changeset
|
1608 BitMap* expected_region_bm, BitMap* expected_card_bm) |
|
d30fa85f9994
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diff
changeset
|
1609 : AbstractGangTask("G1 verify final counting"), |
|
d30fa85f9994
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diff
changeset
|
1610 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
d30fa85f9994
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changeset
|
1611 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
d30fa85f9994
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changeset
|
1612 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
|
d30fa85f9994
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changeset
|
1613 _failures(0), _verbose(false), |
|
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diff
changeset
|
1614 _n_workers(0) { |
|
d30fa85f9994
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diff
changeset
|
1615 assert(VerifyDuringGC, "don't call this otherwise"); |
|
d30fa85f9994
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diff
changeset
|
1616 |
|
d30fa85f9994
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diff
changeset
|
1617 // Use the value already set as the number of active threads |
|
d30fa85f9994
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diff
changeset
|
1618 // in the call to run_task(). |
|
d30fa85f9994
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diff
changeset
|
1619 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
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diff
changeset
|
1620 assert( _g1h->workers()->active_workers() > 0, |
|
d30fa85f9994
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diff
changeset
|
1621 "Should have been previously set"); |
|
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diff
changeset
|
1622 _n_workers = _g1h->workers()->active_workers(); |
|
d30fa85f9994
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diff
changeset
|
1623 } else { |
|
d30fa85f9994
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diff
changeset
|
1624 _n_workers = 1; |
|
d30fa85f9994
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diff
changeset
|
1625 } |
|
d30fa85f9994
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diff
changeset
|
1626 |
|
d30fa85f9994
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diff
changeset
|
1627 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
|
d30fa85f9994
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diff
changeset
|
1628 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
|
d30fa85f9994
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diff
changeset
|
1629 |
|
d30fa85f9994
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diff
changeset
|
1630 _verbose = _cm->verbose_medium(); |
|
d30fa85f9994
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diff
changeset
|
1631 } |
|
d30fa85f9994
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diff
changeset
|
1632 |
|
d30fa85f9994
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diff
changeset
|
1633 void work(uint worker_id) { |
|
d30fa85f9994
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diff
changeset
|
1634 assert(worker_id < _n_workers, "invariant"); |
|
d30fa85f9994
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diff
changeset
|
1635 |
|
d30fa85f9994
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diff
changeset
|
1636 VerifyLiveObjectDataHRClosure verify_cl(_cm, |
|
d30fa85f9994
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4830
diff
changeset
|
1637 _actual_region_bm, _actual_card_bm, |
|
d30fa85f9994
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4830
diff
changeset
|
1638 _expected_region_bm, |
|
d30fa85f9994
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diff
changeset
|
1639 _expected_card_bm, |
|
d30fa85f9994
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diff
changeset
|
1640 _verbose); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1641 |
|
d30fa85f9994
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diff
changeset
|
1642 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
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diff
changeset
|
1643 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
|
d30fa85f9994
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diff
changeset
|
1644 worker_id, |
|
d30fa85f9994
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4830
diff
changeset
|
1645 _n_workers, |
|
d30fa85f9994
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parents:
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diff
changeset
|
1646 HeapRegion::VerifyCountClaimValue); |
|
d30fa85f9994
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diff
changeset
|
1647 } else { |
|
d30fa85f9994
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diff
changeset
|
1648 _g1h->heap_region_iterate(&verify_cl); |
|
d30fa85f9994
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diff
changeset
|
1649 } |
|
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|
1650 |
|
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|
1651 Atomic::add(verify_cl.failures(), &_failures); |
|
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|
1652 } |
|
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|
1653 |
|
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|
1654 int failures() const { return _failures; } |
|
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|
1655 }; |
|
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|
1656 |
|
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|
1657 // Final update of count data (during cleanup). |
|
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|
1658 // Adds [top_at_count, NTAMS) to the marked bytes for each |
|
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|
1659 // region. Sets the bits in the card bitmap corresponding |
|
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|
1660 // to the interval [top_at_count, top], and sets the |
|
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|
1661 // liveness bit for each region containing live data |
|
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|
1662 // in the region bitmap. |
|
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|
1663 |
|
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|
1664 class FinalCountDataUpdateClosure: public HeapRegionClosure { |
|
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|
1665 ConcurrentMark* _cm; |
|
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|
1666 BitMap* _region_bm; |
|
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|
1667 BitMap* _card_bm; |
|
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|
1668 |
|
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|
1669 size_t _total_live_bytes; |
|
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|
1670 size_t _total_used_bytes; |
|
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|
1671 size_t _total_words_done; |
|
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|
1672 |
|
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|
1673 void set_card_bitmap_range(BitMap::idx_t start_idx, BitMap::idx_t last_idx) { |
|
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|
1674 assert(start_idx <= last_idx, "sanity"); |
|
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|
1675 |
|
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|
1676 // Set the inclusive bit range [start_idx, last_idx]. |
|
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|
1677 // For small ranges (up to 8 cards) use a simple loop; otherwise |
|
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|
1678 // use par_at_put_range. |
|
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|
1679 if ((last_idx - start_idx) <= 8) { |
|
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|
1680 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
|
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|
1681 _card_bm->par_set_bit(i); |
|
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|
1682 } |
|
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|
1683 } else { |
|
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|
1684 assert(last_idx < _card_bm->size(), "sanity"); |
|
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|
1685 // Note BitMap::par_at_put_range() is exclusive. |
|
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|
1686 _card_bm->par_at_put_range(start_idx, last_idx+1, true); |
|
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|
1687 } |
|
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|
1688 } |
|
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changeset
|
1689 |
|
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|
1690 // It takes a region that's not empty (i.e., it has at least one |
|
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|
1691 // live object in it and sets its corresponding bit on the region |
|
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|
1692 // bitmap to 1. If the region is "starts humongous" it will also set |
|
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|
1693 // to 1 the bits on the region bitmap that correspond to its |
|
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|
1694 // associated "continues humongous" regions. |
|
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|
1695 void set_bit_for_region(HeapRegion* hr) { |
|
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|
1696 assert(!hr->continuesHumongous(), "should have filtered those out"); |
|
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|
1697 |
|
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|
1698 size_t index = hr->hrs_index(); |
|
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|
1699 if (!hr->startsHumongous()) { |
|
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|
1700 // Normal (non-humongous) case: just set the bit. |
|
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|
1701 _region_bm->par_set_bit((BitMap::idx_t) index); |
|
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|
1702 } else { |
|
d30fa85f9994
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|
1703 // Starts humongous case: calculate how many regions are part of |
|
d30fa85f9994
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|
1704 // this humongous region and then set the bit range. |
|
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|
1705 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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|
1706 HeapRegion *last_hr = g1h->heap_region_containing_raw(hr->end() - 1); |
|
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|
1707 size_t end_index = last_hr->hrs_index() + 1; |
|
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|
1708 _region_bm->par_at_put_range((BitMap::idx_t) index, |
|
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changeset
|
1709 (BitMap::idx_t) end_index, true); |
|
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|
1710 } |
|
d30fa85f9994
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changeset
|
1711 } |
|
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changeset
|
1712 |
|
d30fa85f9994
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diff
changeset
|
1713 public: |
|
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diff
changeset
|
1714 FinalCountDataUpdateClosure(ConcurrentMark* cm, |
|
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|
1715 BitMap* region_bm, |
|
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diff
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|
1716 BitMap* card_bm) : |
|
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|
1717 _cm(cm), _region_bm(region_bm), _card_bm(card_bm), |
|
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|
1718 _total_words_done(0), _total_live_bytes(0), _total_used_bytes(0) { } |
|
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|
1719 |
|
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changeset
|
1720 bool doHeapRegion(HeapRegion* hr) { |
|
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|
1721 |
|
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changeset
|
1722 if (hr->continuesHumongous()) { |
|
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|
1723 // We will ignore these here and process them when their |
|
d30fa85f9994
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|
1724 // associated "starts humongous" region is processed (see |
|
d30fa85f9994
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|
1725 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
d30fa85f9994
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changeset
|
1726 // associated "starts humongous" region to have their bit set to |
|
d30fa85f9994
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|
1727 // 1 since, due to the region chunking in the parallel region |
|
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|
1728 // iteration, a "continues humongous" region might be visited |
|
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|
1729 // before its associated "starts humongous". |
|
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|
1730 return false; |
|
d30fa85f9994
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4830
diff
changeset
|
1731 } |
|
d30fa85f9994
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4830
diff
changeset
|
1732 |
|
d30fa85f9994
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diff
changeset
|
1733 HeapWord* start = hr->top_at_conc_mark_count(); |
|
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|
1734 HeapWord* ntams = hr->next_top_at_mark_start(); |
|
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|
1735 HeapWord* top = hr->top(); |
|
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|
1736 |
|
d30fa85f9994
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diff
changeset
|
1737 assert(hr->bottom() <= start && start <= hr->end() && |
|
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changeset
|
1738 hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
|
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diff
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|
1739 |
|
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diff
changeset
|
1740 size_t words_done = ntams - hr->bottom(); |
|
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diff
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|
1741 |
|
d30fa85f9994
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diff
changeset
|
1742 if (start < ntams) { |
|
d30fa85f9994
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changeset
|
1743 // Region was changed between remark and cleanup pauses |
|
d30fa85f9994
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diff
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|
1744 // We need to add (ntams - start) to the marked bytes |
|
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changeset
|
1745 // for this region, and set bits for the range |
|
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changeset
|
1746 // [ card_idx(start), card_idx(ntams) ) in the card bitmap. |
|
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|
1747 size_t live_bytes = (ntams - start) * HeapWordSize; |
|
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changeset
|
1748 hr->add_to_marked_bytes(live_bytes); |
|
d30fa85f9994
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diff
changeset
|
1749 |
|
d30fa85f9994
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diff
changeset
|
1750 // Record the new top at conc count |
|
d30fa85f9994
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diff
changeset
|
1751 hr->set_top_at_conc_mark_count(ntams); |
|
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diff
changeset
|
1752 |
|
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diff
changeset
|
1753 // The setting of the bits in the card bitmap takes place below |
|
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diff
changeset
|
1754 } |
|
d30fa85f9994
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diff
changeset
|
1755 |
|
d30fa85f9994
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diff
changeset
|
1756 // Mark the allocated-since-marking portion... |
|
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diff
changeset
|
1757 if (ntams < top) { |
|
d30fa85f9994
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diff
changeset
|
1758 // This definitely means the region has live objects. |
|
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diff
changeset
|
1759 set_bit_for_region(hr); |
|
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diff
changeset
|
1760 } |
|
d30fa85f9994
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diff
changeset
|
1761 |
|
d30fa85f9994
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diff
changeset
|
1762 // Now set the bits for [start, top] |
|
d30fa85f9994
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diff
changeset
|
1763 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
|
d30fa85f9994
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diff
changeset
|
1764 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top); |
|
d30fa85f9994
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diff
changeset
|
1765 set_card_bitmap_range(start_idx, last_idx); |
|
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diff
changeset
|
1766 |
|
d30fa85f9994
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diff
changeset
|
1767 // Set the bit for the region if it contains live data |
|
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diff
changeset
|
1768 if (hr->next_marked_bytes() > 0) { |
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1769 set_bit_for_region(hr); |
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1770 } |
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1771 |
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1772 _total_words_done += words_done; |
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1773 _total_used_bytes += hr->used(); |
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1774 _total_live_bytes += hr->next_marked_bytes(); |
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1775 |
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1776 return false; |
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1777 } |
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1778 |
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1779 size_t total_words_done() const { return _total_words_done; } |
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1780 size_t total_live_bytes() const { return _total_live_bytes; } |
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1781 size_t total_used_bytes() const { return _total_used_bytes; } |
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1782 }; |
| 342 | 1783 |
| 1784 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1785 protected: | |
| 1786 G1CollectedHeap* _g1h; | |
|
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1787 ConcurrentMark* _cm; |
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1788 BitMap* _actual_region_bm; |
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1789 BitMap* _actual_card_bm; |
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1790 |
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1791 uint _n_workers; |
|
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1792 |
| 342 | 1793 size_t *_live_bytes; |
| 1794 size_t *_used_bytes; | |
|
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1795 |
| 342 | 1796 public: |
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1797 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1798 : AbstractGangTask("G1 final counting"), |
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1799 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1800 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1801 _n_workers(0) { |
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1802 // Use the value already set as the number of active threads |
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1803 // in the call to run_task(). Needed for the allocation of |
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1804 // _live_bytes and _used_bytes. |
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1805 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1806 assert( _g1h->workers()->active_workers() > 0, |
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1807 "Should have been previously set"); |
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1808 _n_workers = _g1h->workers()->active_workers(); |
|
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1809 } else { |
| 342 | 1810 _n_workers = 1; |
|
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1811 } |
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1812 |
| 342 | 1813 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); |
| 1814 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
| 1815 } | |
| 1816 | |
| 1817 ~G1ParFinalCountTask() { | |
| 1818 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
| 1819 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
| 1820 } | |
| 1821 | |
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1822 void work(uint worker_id) { |
|
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1823 assert(worker_id < _n_workers, "invariant"); |
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1824 |
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1825 FinalCountDataUpdateClosure final_update_cl(_cm, |
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1826 _actual_region_bm, |
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1827 _actual_card_bm); |
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1828 |
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1829 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1830 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1831 worker_id, |
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1832 _n_workers, |
| 355 | 1833 HeapRegion::FinalCountClaimValue); |
| 342 | 1834 } else { |
|
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1835 _g1h->heap_region_iterate(&final_update_cl); |
| 342 | 1836 } |
|
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1837 |
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1838 _live_bytes[worker_id] = final_update_cl.total_live_bytes(); |
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1839 _used_bytes[worker_id] = final_update_cl.total_used_bytes(); |
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1840 } |
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1841 |
| 342 | 1842 size_t live_bytes() { |
| 1843 size_t live_bytes = 0; | |
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1844 for (uint i = 0; i < _n_workers; ++i) |
| 342 | 1845 live_bytes += _live_bytes[i]; |
| 1846 return live_bytes; | |
| 1847 } | |
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1848 |
| 342 | 1849 size_t used_bytes() { |
| 1850 size_t used_bytes = 0; | |
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1851 for (uint i = 0; i < _n_workers; ++i) |
| 342 | 1852 used_bytes += _used_bytes[i]; |
| 1853 return used_bytes; | |
| 1854 } | |
| 1855 }; | |
| 1856 | |
| 1857 class G1ParNoteEndTask; | |
| 1858 | |
| 1859 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1860 G1CollectedHeap* _g1; | |
| 1861 int _worker_num; | |
| 1862 size_t _max_live_bytes; | |
| 1863 size_t _regions_claimed; | |
| 1864 size_t _freed_bytes; | |
| 2173 | 1865 FreeRegionList* _local_cleanup_list; |
| 4072 | 1866 OldRegionSet* _old_proxy_set; |
| 2173 | 1867 HumongousRegionSet* _humongous_proxy_set; |
| 1868 HRRSCleanupTask* _hrrs_cleanup_task; | |
| 342 | 1869 double _claimed_region_time; |
| 1870 double _max_region_time; | |
| 1871 | |
| 1872 public: | |
| 1873 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1874 int worker_num, |
| 1875 FreeRegionList* local_cleanup_list, | |
| 4072 | 1876 OldRegionSet* old_proxy_set, |
| 2173 | 1877 HumongousRegionSet* humongous_proxy_set, |
|
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1878 HRRSCleanupTask* hrrs_cleanup_task) : |
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1879 _g1(g1), _worker_num(worker_num), |
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1880 _max_live_bytes(0), _regions_claimed(0), |
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1881 _freed_bytes(0), |
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1882 _claimed_region_time(0.0), _max_region_time(0.0), |
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1883 _local_cleanup_list(local_cleanup_list), |
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1884 _old_proxy_set(old_proxy_set), |
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1885 _humongous_proxy_set(humongous_proxy_set), |
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1886 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1887 |
| 342 | 1888 size_t freed_bytes() { return _freed_bytes; } |
| 1889 | |
|
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1890 bool doHeapRegion(HeapRegion *hr) { |
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1891 // We use a claim value of zero here because all regions |
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1892 // were claimed with value 1 in the FinalCount task. |
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1893 hr->reset_gc_time_stamp(); |
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1894 if (!hr->continuesHumongous()) { |
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1895 double start = os::elapsedTime(); |
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1896 _regions_claimed++; |
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1897 hr->note_end_of_marking(); |
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1898 _max_live_bytes += hr->max_live_bytes(); |
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1899 _g1->free_region_if_empty(hr, |
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1900 &_freed_bytes, |
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1901 _local_cleanup_list, |
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1902 _old_proxy_set, |
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1903 _humongous_proxy_set, |
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1904 _hrrs_cleanup_task, |
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1905 true /* par */); |
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1906 double region_time = (os::elapsedTime() - start); |
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1907 _claimed_region_time += region_time; |
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1908 if (region_time > _max_region_time) { |
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1909 _max_region_time = region_time; |
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1910 } |
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1911 } |
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1912 return false; |
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1913 } |
| 342 | 1914 |
| 1915 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1916 size_t regions_claimed() { return _regions_claimed; } | |
| 1917 double claimed_region_time_sec() { return _claimed_region_time; } | |
| 1918 double max_region_time_sec() { return _max_region_time; } | |
| 1919 }; | |
| 1920 | |
| 1921 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1922 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1923 |
| 342 | 1924 protected: |
| 1925 G1CollectedHeap* _g1h; | |
| 1926 size_t _max_live_bytes; | |
| 1927 size_t _freed_bytes; | |
| 2152 | 1928 FreeRegionList* _cleanup_list; |
| 1929 | |
| 342 | 1930 public: |
| 1931 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1932 FreeRegionList* cleanup_list) : |
| 342 | 1933 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1934 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1935 |
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1936 void work(uint worker_id) { |
| 342 | 1937 double start = os::elapsedTime(); |
| 2173 | 1938 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 4072 | 1939 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
| 2173 | 1940 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
| 1941 HRRSCleanupTask hrrs_cleanup_task; | |
|
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1942 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
| 4072 | 1943 &old_proxy_set, |
| 2173 | 1944 &humongous_proxy_set, |
| 1945 &hrrs_cleanup_task); | |
|
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1946 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1947 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1948 _g1h->workers()->active_workers(), |
| 355 | 1949 HeapRegion::NoteEndClaimValue); |
| 342 | 1950 } else { |
| 1951 _g1h->heap_region_iterate(&g1_note_end); | |
| 1952 } | |
| 1953 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1954 | |
| 2152 | 1955 // Now update the lists |
| 1956 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
| 1957 NULL /* free_list */, | |
| 4072 | 1958 &old_proxy_set, |
| 2173 | 1959 &humongous_proxy_set, |
| 2152 | 1960 true /* par */); |
| 342 | 1961 { |
| 1962 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 1963 _max_live_bytes += g1_note_end.max_live_bytes(); | |
| 1964 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1965 |
|
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1966 // If we iterate over the global cleanup list at the end of |
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1967 // cleanup to do this printing we will not guarantee to only |
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1968 // generate output for the newly-reclaimed regions (the list |
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1969 // might not be empty at the beginning of cleanup; we might |
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1970 // still be working on its previous contents). So we do the |
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1971 // printing here, before we append the new regions to the global |
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1972 // cleanup list. |
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1973 |
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1974 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1975 if (hr_printer->is_active()) { |
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1976 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1977 while (iter.more_available()) { |
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1978 HeapRegion* hr = iter.get_next(); |
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1979 hr_printer->cleanup(hr); |
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1980 } |
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1981 } |
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1982 |
| 2173 | 1983 _cleanup_list->add_as_tail(&local_cleanup_list); |
| 1984 assert(local_cleanup_list.is_empty(), "post-condition"); | |
| 1985 | |
| 1986 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1987 } |
| 1988 double end = os::elapsedTime(); | |
| 1989 if (G1PrintParCleanupStats) { | |
| 1990 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
|
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1991 "claimed %u regions (tot = %8.3f ms, max = %8.3f ms).\n", |
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1992 worker_id, start, end, (end-start)*1000.0, |
| 342 | 1993 g1_note_end.regions_claimed(), |
| 1994 g1_note_end.claimed_region_time_sec()*1000.0, | |
| 1995 g1_note_end.max_region_time_sec()*1000.0); | |
| 1996 } | |
| 1997 } | |
| 1998 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1999 size_t freed_bytes() { return _freed_bytes; } | |
| 2000 }; | |
| 2001 | |
| 2002 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 2003 protected: | |
| 2004 G1RemSet* _g1rs; | |
| 2005 BitMap* _region_bm; | |
| 2006 BitMap* _card_bm; | |
| 2007 public: | |
| 2008 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 2009 BitMap* region_bm, BitMap* card_bm) : | |
| 2010 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
|
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2011 _region_bm(region_bm), _card_bm(card_bm) { } |
| 342 | 2012 |
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2013 void work(uint worker_id) { |
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2014 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2015 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 2016 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 2017 } else { |
| 2018 _g1rs->scrub(_region_bm, _card_bm); | |
| 2019 } | |
| 2020 } | |
| 2021 | |
| 2022 }; | |
| 2023 | |
| 2024 void ConcurrentMark::cleanup() { | |
| 2025 // world is stopped at this checkpoint | |
| 2026 assert(SafepointSynchronize::is_at_safepoint(), | |
| 2027 "world should be stopped"); | |
| 2028 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2029 | |
| 2030 // If a full collection has happened, we shouldn't do this. | |
| 2031 if (has_aborted()) { | |
| 2032 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 2033 return; | |
| 2034 } | |
| 2035 | |
| 4072 | 2036 HRSPhaseSetter x(HRSPhaseCleanup); |
| 2152 | 2037 g1h->verify_region_sets_optional(); |
| 2038 | |
|
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2039 if (VerifyDuringGC) { |
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2040 HandleMark hm; // handle scope |
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2041 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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2042 Universe::heap()->prepare_for_verify(); |
|
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2043 Universe::verify(/* allow dirty */ true, |
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2044 /* silent */ false, |
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2045 /* option */ VerifyOption_G1UsePrevMarking); |
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2046 } |
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2047 |
| 342 | 2048 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 2049 g1p->record_concurrent_mark_cleanup_start(); | |
| 2050 | |
| 2051 double start = os::elapsedTime(); | |
| 2052 | |
| 2173 | 2053 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 2054 | |
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2055 uint n_workers; |
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2056 |
| 342 | 2057 // Do counting once more with the world stopped for good measure. |
|
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2058 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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2059 |
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2060 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2061 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
| 355 | 2062 "sanity check"); |
| 2063 | |
| 4711 | 2064 g1h->set_par_threads(); |
| 2065 n_workers = g1h->n_par_threads(); | |
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2066 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 2067 "Should not have been reset"); |
| 342 | 2068 g1h->workers()->run_task(&g1_par_count_task); |
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2069 // Done with the parallel phase so reset to 0. |
| 342 | 2070 g1h->set_par_threads(0); |
| 355 | 2071 |
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2072 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
| 355 | 2073 "sanity check"); |
| 342 | 2074 } else { |
| 4711 | 2075 n_workers = 1; |
| 342 | 2076 g1_par_count_task.work(0); |
| 2077 } | |
| 2078 | |
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2079 if (VerifyDuringGC) { |
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2080 // Verify that the counting data accumulated during marking matches |
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2081 // that calculated by walking the marking bitmap. |
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2082 |
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2083 // Bitmaps to hold expected values |
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2084 BitMap expected_region_bm(_region_bm.size(), false); |
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2085 BitMap expected_card_bm(_card_bm.size(), false); |
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2086 |
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2087 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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2088 &_region_bm, |
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2089 &_card_bm, |
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2090 &expected_region_bm, |
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2091 &expected_card_bm); |
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2092 |
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2093 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2094 g1h->set_par_threads((int)n_workers); |
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2095 g1h->workers()->run_task(&g1_par_verify_task); |
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2096 // Done with the parallel phase so reset to 0. |
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2097 g1h->set_par_threads(0); |
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2098 |
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2099 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2100 "sanity check"); |
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2101 } else { |
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2102 g1_par_verify_task.work(0); |
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2103 } |
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2104 |
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2105 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2106 } |
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2107 |
| 342 | 2108 size_t known_garbage_bytes = |
| 2109 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
| 2110 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
| 2111 | |
| 2112 size_t start_used_bytes = g1h->used(); | |
| 2113 _at_least_one_mark_complete = true; | |
| 2114 g1h->set_marking_complete(); | |
| 2115 | |
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2116 ergo_verbose4(ErgoConcCycles, |
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2117 "finish cleanup", |
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2118 ergo_format_byte("occupancy") |
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2119 ergo_format_byte("capacity") |
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2120 ergo_format_byte_perc("known garbage"), |
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2121 start_used_bytes, g1h->capacity(), |
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2122 known_garbage_bytes, |
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2123 ((double) known_garbage_bytes / (double) g1h->capacity()) * 100.0); |
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2124 |
| 342 | 2125 double count_end = os::elapsedTime(); |
| 2126 double this_final_counting_time = (count_end - start); | |
| 2127 if (G1PrintParCleanupStats) { | |
| 2128 gclog_or_tty->print_cr("Cleanup:"); | |
| 2129 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
| 2130 this_final_counting_time*1000.0); | |
| 2131 } | |
| 2132 _total_counting_time += this_final_counting_time; | |
| 2133 | |
|
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2134 if (G1PrintRegionLivenessInfo) { |
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2135 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2136 _g1h->heap_region_iterate(&cl); |
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2137 } |
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2138 |
| 342 | 2139 // Install newly created mark bitMap as "prev". |
| 2140 swapMarkBitMaps(); | |
| 2141 | |
| 2142 g1h->reset_gc_time_stamp(); | |
| 2143 | |
| 2144 // Note end of marking in all heap regions. | |
| 2145 double note_end_start = os::elapsedTime(); | |
| 2152 | 2146 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
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2147 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2148 g1h->set_par_threads((int)n_workers); |
| 342 | 2149 g1h->workers()->run_task(&g1_par_note_end_task); |
| 2150 g1h->set_par_threads(0); | |
| 355 | 2151 |
| 2152 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 2153 "sanity check"); | |
| 342 | 2154 } else { |
| 2155 g1_par_note_end_task.work(0); | |
| 2156 } | |
| 2152 | 2157 |
| 2158 if (!cleanup_list_is_empty()) { | |
| 2159 // The cleanup list is not empty, so we'll have to process it | |
| 2160 // concurrently. Notify anyone else that might be wanting free | |
| 2161 // regions that there will be more free regions coming soon. | |
| 2162 g1h->set_free_regions_coming(); | |
| 2163 } | |
| 342 | 2164 double note_end_end = os::elapsedTime(); |
| 2165 if (G1PrintParCleanupStats) { | |
| 2166 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
| 2167 (note_end_end - note_end_start)*1000.0); | |
| 2168 } | |
| 2169 | |
| 2170 // call below, since it affects the metric by which we sort the heap | |
| 2171 // regions. | |
| 2172 if (G1ScrubRemSets) { | |
| 2173 double rs_scrub_start = os::elapsedTime(); | |
| 2174 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
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2175 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2176 g1h->set_par_threads((int)n_workers); |
| 342 | 2177 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 2178 g1h->set_par_threads(0); | |
| 355 | 2179 |
| 2180 assert(g1h->check_heap_region_claim_values( | |
| 2181 HeapRegion::ScrubRemSetClaimValue), | |
| 2182 "sanity check"); | |
| 342 | 2183 } else { |
| 2184 g1_par_scrub_rs_task.work(0); | |
| 2185 } | |
| 2186 | |
| 2187 double rs_scrub_end = os::elapsedTime(); | |
| 2188 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 2189 _total_rs_scrub_time += this_rs_scrub_time; | |
| 2190 } | |
| 2191 | |
| 2192 // this will also free any regions totally full of garbage objects, | |
| 2193 // and sort the regions. | |
|
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|
2194 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 2195 |
| 2196 // Statistics. | |
| 2197 double end = os::elapsedTime(); | |
| 2198 _cleanup_times.add((end - start) * 1000.0); | |
| 2199 | |
| 2200 if (PrintGC || PrintGCDetails) { | |
| 2201 g1h->print_size_transition(gclog_or_tty, | |
| 2202 start_used_bytes, | |
| 2203 g1h->used(), | |
| 2204 g1h->capacity()); | |
| 2205 } | |
| 2206 | |
| 2207 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
| 2208 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
| 2209 | |
|
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2210 // Clean up will have freed any regions completely full of garbage. |
|
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2211 // Update the soft reference policy with the new heap occupancy. |
|
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2212 Universe::update_heap_info_at_gc(); |
|
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2213 |
| 342 | 2214 // We need to make this be a "collection" so any collection pause that |
| 2215 // races with it goes around and waits for completeCleanup to finish. | |
| 2216 g1h->increment_total_collections(); | |
| 2217 | |
|
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2218 // We reclaimed old regions so we should calculate the sizes to make |
|
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2219 // sure we update the old gen/space data. |
|
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2220 g1h->g1mm()->update_sizes(); |
|
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2221 |
| 751 | 2222 if (VerifyDuringGC) { |
|
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2223 HandleMark hm; // handle scope |
|
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2224 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
|
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|
2225 Universe::heap()->prepare_for_verify(); |
|
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|
2226 Universe::verify(/* allow dirty */ true, |
|
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|
2227 /* silent */ false, |
|
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|
2228 /* option */ VerifyOption_G1UsePrevMarking); |
| 342 | 2229 } |
| 2152 | 2230 |
| 2231 g1h->verify_region_sets_optional(); | |
| 342 | 2232 } |
| 2233 | |
| 2234 void ConcurrentMark::completeCleanup() { | |
| 2235 if (has_aborted()) return; | |
| 2236 | |
| 2152 | 2237 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 2238 | |
| 2239 _cleanup_list.verify_optional(); | |
| 2361 | 2240 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 2241 |
| 2242 if (G1ConcRegionFreeingVerbose) { | |
| 2243 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
| 2244 "cleanup list has "SIZE_FORMAT" entries", | |
| 2245 _cleanup_list.length()); | |
| 2246 } | |
| 2247 | |
| 2248 // Noone else should be accessing the _cleanup_list at this point, | |
| 2249 // so it's not necessary to take any locks | |
| 2250 while (!_cleanup_list.is_empty()) { | |
| 2251 HeapRegion* hr = _cleanup_list.remove_head(); | |
| 2252 assert(hr != NULL, "the list was not empty"); | |
|
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|
2253 hr->par_clear(); |
| 2361 | 2254 tmp_free_list.add_as_tail(hr); |
| 2152 | 2255 |
| 2256 // Instead of adding one region at a time to the secondary_free_list, | |
| 2257 // we accumulate them in the local list and move them a few at a | |
| 2258 // time. This also cuts down on the number of notify_all() calls | |
| 2259 // we do during this process. We'll also append the local list when | |
| 2260 // _cleanup_list is empty (which means we just removed the last | |
| 2261 // region from the _cleanup_list). | |
| 2361 | 2262 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 2263 _cleanup_list.is_empty()) { |
| 2264 if (G1ConcRegionFreeingVerbose) { | |
| 2265 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
| 2266 "appending "SIZE_FORMAT" entries to the " | |
| 2267 "secondary_free_list, clean list still has " | |
| 2268 SIZE_FORMAT" entries", | |
| 2361 | 2269 tmp_free_list.length(), |
| 2152 | 2270 _cleanup_list.length()); |
| 342 | 2271 } |
| 2152 | 2272 |
| 2273 { | |
| 2274 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 2361 | 2275 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
| 2152 | 2276 SecondaryFreeList_lock->notify_all(); |
| 2277 } | |
| 2278 | |
| 2279 if (G1StressConcRegionFreeing) { | |
| 2280 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 2281 os::sleep(Thread::current(), (jlong) 1, false); | |
| 2282 } | |
| 2283 } | |
| 342 | 2284 } |
| 2285 } | |
| 2361 | 2286 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 2287 } |
| 2288 | |
|
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|
2289 // Support closures for reference procssing in G1 |
|
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|
2290 |
|
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|
2291 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
|
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|
2292 HeapWord* addr = (HeapWord*)obj; |
|
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|
2293 return addr != NULL && |
|
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|
2294 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
|
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|
2295 } |
| 342 | 2296 |
| 2297 class G1CMKeepAliveClosure: public OopClosure { | |
| 2298 G1CollectedHeap* _g1; | |
| 2299 ConcurrentMark* _cm; | |
| 2300 public: | |
|
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|
2301 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
|
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|
2302 _g1(g1), _cm(cm) { |
|
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|
2303 assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
|
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|
2304 } |
| 342 | 2305 |
|
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|
2306 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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|
2307 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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|
2308 |
|
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|
2309 template <class T> void do_oop_work(T* p) { |
|
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|
2310 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
2311 HeapWord* addr = (HeapWord*)obj; |
|
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|
2312 |
|
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|
2313 if (_cm->verbose_high()) { |
|
2174
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|
2314 gclog_or_tty->print_cr("\t[0] we're looking at location " |
|
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|
2315 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
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|
2316 p, (void*) obj); |
|
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|
2317 } |
|
2174
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|
2318 |
|
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|
2319 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
|
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|
2320 _cm->mark_and_count(obj); |
|
2174
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|
2321 _cm->mark_stack_push(obj); |
| 342 | 2322 } |
| 2323 } | |
| 2324 }; | |
| 2325 | |
| 2326 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
|
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|
2327 ConcurrentMark* _cm; |
| 342 | 2328 CMMarkStack* _markStack; |
| 2329 G1CMKeepAliveClosure* _oopClosure; | |
| 2330 public: | |
|
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|
2331 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
| 342 | 2332 G1CMKeepAliveClosure* oopClosure) : |
|
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|
2333 _cm(cm), |
| 342 | 2334 _markStack(markStack), |
|
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|
2335 _oopClosure(oopClosure) { } |
| 342 | 2336 |
| 2337 void do_void() { | |
|
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|
2338 _markStack->drain((OopClosure*)_oopClosure, _cm->nextMarkBitMap(), false); |
| 342 | 2339 } |
| 2340 }; | |
| 2341 | |
|
2174
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|
2342 // 'Keep Alive' closure used by parallel reference processing. |
|
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|
2343 // An instance of this closure is used in the parallel reference processing |
|
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|
2344 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
|
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|
2345 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
|
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|
2346 // placed on to discovered ref lists once so we can mark and push with no |
|
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|
2347 // need to check whether the object has already been marked. Using the |
|
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|
2348 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
|
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|
2349 // operating on the global mark stack. This means that an individual |
|
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|
2350 // worker would be doing lock-free pushes while it processes its own |
|
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|
2351 // discovered ref list followed by drain call. If the discovered ref lists |
|
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|
2352 // are unbalanced then this could cause interference with the other |
|
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|
2353 // workers. Using a CMTask (and its embedded local data structures) |
|
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|
2354 // avoids that potential interference. |
|
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|
2355 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
|
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|
2356 ConcurrentMark* _cm; |
|
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|
2357 CMTask* _task; |
|
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|
2358 int _ref_counter_limit; |
|
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|
2359 int _ref_counter; |
|
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|
2360 public: |
|
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|
2361 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
|
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|
2362 _cm(cm), _task(task), |
|
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|
2363 _ref_counter_limit(G1RefProcDrainInterval) { |
|
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|
2364 assert(_ref_counter_limit > 0, "sanity"); |
|
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|
2365 _ref_counter = _ref_counter_limit; |
|
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|
2366 } |
|
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|
2367 |
|
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|
2368 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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|
2369 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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|
2370 |
|
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|
2371 template <class T> void do_oop_work(T* p) { |
|
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|
2372 if (!_cm->has_overflown()) { |
|
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|
2373 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
2374 if (_cm->verbose_high()) { |
|
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|
2375 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
|
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|
2376 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
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|
2377 _task->task_id(), p, (void*) obj); |
|
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|
2378 } |
|
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2379 |
|
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|
2380 _task->deal_with_reference(obj); |
|
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|
2381 _ref_counter--; |
|
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|
2382 |
|
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|
2383 if (_ref_counter == 0) { |
|
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|
2384 // We have dealt with _ref_counter_limit references, pushing them and objects |
|
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|
2385 // reachable from them on to the local stack (and possibly the global stack). |
|
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|
2386 // Call do_marking_step() to process these entries. We call the routine in a |
|
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2387 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
|
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2388 // with the entries that we've pushed as a result of the deal_with_reference |
|
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2389 // calls above) or we overflow. |
|
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2390 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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2391 // while there may still be some work to do. (See the comment at the |
|
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2392 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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2393 // is reaching the specified time target.) It is only when |
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2394 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2395 // that the marking has completed. |
|
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|
2396 do { |
|
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2397 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
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2398 _task->do_marking_step(mark_step_duration_ms, |
|
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|
2399 false /* do_stealing */, |
|
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|
2400 false /* do_termination */); |
|
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|
2401 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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2402 _ref_counter = _ref_counter_limit; |
|
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|
2403 } |
|
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|
2404 } else { |
|
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|
2405 if (_cm->verbose_high()) { |
|
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2406 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
|
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2407 } |
|
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|
2408 } |
|
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|
2409 } |
|
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|
2410 }; |
|
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|
2411 |
|
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|
2412 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
|
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|
2413 ConcurrentMark* _cm; |
|
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|
2414 CMTask* _task; |
|
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|
2415 public: |
|
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|
2416 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
|
4836
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|
2417 _cm(cm), _task(task) { } |
|
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2418 |
|
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|
2419 void do_void() { |
|
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|
2420 do { |
|
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|
2421 if (_cm->verbose_high()) { |
|
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|
2422 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
|
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|
2423 _task->task_id()); |
|
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|
2424 } |
|
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|
2425 |
|
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|
2426 // We call CMTask::do_marking_step() to completely drain the local and |
|
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|
2427 // global marking stacks. The routine is called in a loop, which we'll |
|
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|
2428 // exit if there's nothing more to do (i.e. we'completely drained the |
|
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|
2429 // entries that were pushed as a result of applying the |
|
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|
2430 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
|
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|
2431 // lists above) or we overflow the global marking stack. |
|
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|
2432 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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|
2433 // while there may still be some work to do. (See the comment at the |
|
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|
2434 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
234761c55641
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|
2435 // is reaching the specified time target.) It is only when |
|
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|
2436 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2437 // that the marking has completed. |
|
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|
2438 |
|
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|
2439 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2440 true /* do_stealing */, |
|
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|
2441 true /* do_termination */); |
|
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|
2442 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2443 } |
|
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|
2444 }; |
|
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|
2445 |
|
3979
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|
2446 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
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|
2447 // reference processing at the end of G1 concurrent marking |
|
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|
2448 |
|
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|
2449 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
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|
2450 private: |
|
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|
2451 G1CollectedHeap* _g1h; |
|
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|
2452 ConcurrentMark* _cm; |
|
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|
2453 WorkGang* _workers; |
|
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|
2454 int _active_workers; |
|
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|
2455 |
|
234761c55641
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|
2456 public: |
|
3979
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|
2457 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
2174
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|
2458 ConcurrentMark* cm, |
|
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|
2459 WorkGang* workers, |
|
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|
2460 int n_workers) : |
|
4093
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|
2461 _g1h(g1h), _cm(cm), |
|
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|
2462 _workers(workers), _active_workers(n_workers) { } |
|
2174
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|
2463 |
|
234761c55641
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|
2464 // Executes the given task using concurrent marking worker threads. |
|
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|
2465 virtual void execute(ProcessTask& task); |
|
234761c55641
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changeset
|
2466 virtual void execute(EnqueueTask& task); |
|
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|
2467 }; |
|
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|
2468 |
|
3979
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|
2469 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
2174
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|
2470 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
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|
2471 ProcessTask& _proc_task; |
|
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|
2472 G1CollectedHeap* _g1h; |
|
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|
2473 ConcurrentMark* _cm; |
|
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|
2474 |
|
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|
2475 public: |
|
3979
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|
2476 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
2174
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|
2477 G1CollectedHeap* g1h, |
|
4093
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|
2478 ConcurrentMark* cm) : |
|
2174
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|
2479 AbstractGangTask("Process reference objects in parallel"), |
|
4093
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|
2480 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
|
2174
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|
2481 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
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|
2482 virtual void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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|
2483 CMTask* marking_task = _cm->task(worker_id); |
|
2174
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|
2484 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
4093
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|
2485 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
|
2174
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|
2486 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
|
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|
2487 |
|
4728
441e946dc1af
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jmasa
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4711
diff
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|
2488 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
2174
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|
2489 } |
|
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|
2490 }; |
|
234761c55641
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changeset
|
2491 |
|
3979
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|
2492 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
2174
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|
2493 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
2494 |
|
4093
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|
2495 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
2174
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|
2496 |
|
234761c55641
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changeset
|
2497 // We need to reset the phase for each task execution so that |
|
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|
2498 // the termination protocol of CMTask::do_marking_step works. |
|
234761c55641
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changeset
|
2499 _cm->set_phase(_active_workers, false /* concurrent */); |
|
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|
2500 _g1h->set_par_threads(_active_workers); |
|
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|
2501 _workers->run_task(&proc_task_proxy); |
|
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diff
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|
2502 _g1h->set_par_threads(0); |
|
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|
2503 } |
|
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2504 |
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2505 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
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2506 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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2507 EnqueueTask& _enq_task; |
|
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2508 |
|
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|
2509 public: |
|
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2510 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
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2511 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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2512 _enq_task(enq_task) { } |
|
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2513 |
|
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|
2514 virtual void work(uint worker_id) { |
|
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2515 _enq_task.work(worker_id); |
|
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2516 } |
|
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|
2517 }; |
|
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2518 |
|
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2519 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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2520 assert(_workers != NULL, "Need parallel worker threads."); |
|
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2521 |
|
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2522 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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2523 |
|
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2524 _g1h->set_par_threads(_active_workers); |
|
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2525 _workers->run_task(&enq_task_proxy); |
|
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2526 _g1h->set_par_threads(0); |
|
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|
2527 } |
|
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|
2528 |
| 342 | 2529 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
| 2530 ResourceMark rm; | |
| 2531 HandleMark hm; | |
|
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2532 |
|
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2533 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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2534 |
|
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|
2535 // Is alive closure. |
|
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|
2536 G1CMIsAliveClosure g1_is_alive(g1h); |
|
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2537 |
|
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2538 // Inner scope to exclude the cleaning of the string and symbol |
|
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|
2539 // tables from the displayed time. |
|
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|
2540 { |
|
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|
2541 bool verbose = PrintGC && PrintGCDetails; |
|
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|
2542 if (verbose) { |
|
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|
2543 gclog_or_tty->put(' '); |
|
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|
2544 } |
|
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|
2545 TraceTime t("GC ref-proc", verbose, false, gclog_or_tty); |
|
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2546 |
|
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|
2547 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
3975
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2548 |
|
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|
2549 // See the comment in G1CollectedHeap::ref_processing_init() |
|
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2550 // about how reference processing currently works in G1. |
|
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2551 |
|
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|
2552 // Process weak references. |
|
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|
2553 rp->setup_policy(clear_all_soft_refs); |
|
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|
2554 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
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|
2555 |
|
4836
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|
2556 G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
|
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|
2557 G1CMDrainMarkingStackClosure |
|
4836
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|
2558 g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
|
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2559 |
|
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|
2560 // We use the work gang from the G1CollectedHeap and we utilize all |
|
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|
2561 // the worker threads. |
|
4728
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|
2562 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
|
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|
2563 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
|
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|
2564 |
|
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|
2565 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
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|
2566 g1h->workers(), active_workers); |
|
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|
2567 |
|
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|
2568 if (rp->processing_is_mt()) { |
|
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|
2569 // Set the degree of MT here. If the discovery is done MT, there |
|
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|
2570 // may have been a different number of threads doing the discovery |
|
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|
2571 // and a different number of discovered lists may have Ref objects. |
|
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|
2572 // That is OK as long as the Reference lists are balanced (see |
|
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|
2573 // balance_all_queues() and balance_queues()). |
|
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|
2574 rp->set_active_mt_degree(active_workers); |
|
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|
2575 |
|
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|
2576 rp->process_discovered_references(&g1_is_alive, |
|
2174
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|
2577 &g1_keep_alive, |
|
234761c55641
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|
2578 &g1_drain_mark_stack, |
|
234761c55641
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|
2579 &par_task_executor); |
|
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|
2580 |
|
3975
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|
2581 // The work routines of the parallel keep_alive and drain_marking_stack |
|
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|
2582 // will set the has_overflown flag if we overflow the global marking |
|
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|
2583 // stack. |
|
1847b501ae74
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|
2584 } else { |
|
1847b501ae74
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|
2585 rp->process_discovered_references(&g1_is_alive, |
|
1847b501ae74
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|
2586 &g1_keep_alive, |
|
1847b501ae74
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diff
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|
2587 &g1_drain_mark_stack, |
|
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|
2588 NULL); |
|
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|
2589 } |
|
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|
2590 |
|
1847b501ae74
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|
2591 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
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|
2592 "mark stack should be empty (unless it overflowed)"); |
|
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|
2593 if (_markStack.overflow()) { |
|
1847b501ae74
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|
2594 // Should have been done already when we tried to push an |
|
1847b501ae74
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changeset
|
2595 // entry on to the global mark stack. But let's do it again. |
|
1847b501ae74
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|
2596 set_has_overflown(); |
|
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|
2597 } |
|
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diff
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|
2598 |
|
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diff
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|
2599 if (rp->processing_is_mt()) { |
|
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|
2600 assert(rp->num_q() == active_workers, "why not"); |
|
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|
2601 rp->enqueue_discovered_references(&par_task_executor); |
|
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|
2602 } else { |
|
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|
2603 rp->enqueue_discovered_references(); |
|
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|
2604 } |
|
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|
2605 |
|
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|
2606 rp->verify_no_references_recorded(); |
|
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|
2607 assert(!rp->discovery_enabled(), "Post condition"); |
|
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|
2608 } |
|
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|
2609 |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2175
diff
changeset
|
2610 // Now clean up stale oops in StringTable |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
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1974
diff
changeset
|
2611 StringTable::unlink(&g1_is_alive); |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2175
diff
changeset
|
2612 // Clean up unreferenced symbols in symbol table. |
|
3582bf76420e
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coleenp
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|
2613 SymbolTable::unlink(); |
| 342 | 2614 } |
| 2615 | |
| 2616 void ConcurrentMark::swapMarkBitMaps() { | |
| 2617 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2618 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2619 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2620 } | |
| 2621 | |
| 2622 class CMRemarkTask: public AbstractGangTask { | |
| 2623 private: | |
| 2624 ConcurrentMark *_cm; | |
| 2625 | |
| 2626 public: | |
|
4728
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|
2627 void work(uint worker_id) { |
| 342 | 2628 // Since all available tasks are actually started, we should |
| 2629 // only proceed if we're supposed to be actived. | |
|
4728
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|
2630 if (worker_id < _cm->active_tasks()) { |
|
441e946dc1af
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|
2631 CMTask* task = _cm->task(worker_id); |
| 342 | 2632 task->record_start_time(); |
| 2633 do { | |
|
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|
2634 task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2635 true /* do_stealing */, |
|
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changeset
|
2636 true /* do_termination */); |
| 342 | 2637 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2638 // If we overflow, then we do not want to restart. We instead | |
| 2639 // want to abort remark and do concurrent marking again. | |
| 2640 task->record_end_time(); | |
| 2641 } | |
| 2642 } | |
| 2643 | |
| 4711 | 2644 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
|
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4093
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|
2645 AbstractGangTask("Par Remark"), _cm(cm) { |
| 4711 | 2646 _cm->terminator()->reset_for_reuse(active_workers); |
|
4095
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|
2647 } |
| 342 | 2648 }; |
| 2649 | |
| 2650 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2651 ResourceMark rm; | |
| 2652 HandleMark hm; | |
| 2653 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2654 | |
| 2655 g1h->ensure_parsability(false); | |
| 2656 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1719
diff
changeset
|
2657 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2658 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
4095
bca17e38de00
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jmasa
parents:
4093
diff
changeset
|
2659 // 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
|
2660 uint active_workers = g1h->workers()->active_workers(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2661 if (active_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2662 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
|
2663 active_workers = (uint) ParallelGCThreads; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2664 g1h->workers()->set_active_workers(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2665 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2666 set_phase(active_workers, false /* concurrent */); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2667 // Leave _parallel_marking_threads at it's |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2668 // value originally calculated in the ConcurrentMark |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2669 // constructor and pass values of the active workers |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2670 // through the gang in the task. |
| 342 | 2671 |
| 4711 | 2672 CMRemarkTask remarkTask(this, active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2673 g1h->set_par_threads(active_workers); |
| 342 | 2674 g1h->workers()->run_task(&remarkTask); |
| 2675 g1h->set_par_threads(0); | |
| 2676 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2677 G1CollectedHeap::StrongRootsScope srs(g1h); |
| 342 | 2678 // 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
|
2679 uint active_workers = 1; |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2680 set_phase(active_workers, false /* concurrent */); |
| 342 | 2681 |
| 4711 | 2682 CMRemarkTask remarkTask(this, active_workers); |
| 342 | 2683 // We will start all available threads, even if we decide that the |
| 2684 // active_workers will be fewer. The extra ones will just bail out | |
| 2685 // immediately. | |
| 2686 remarkTask.work(0); | |
| 2687 } | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2688 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2689 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2690 |
| 2691 print_stats(); | |
| 2692 | |
| 2693 #if VERIFY_OBJS_PROCESSED | |
| 2694 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
| 2695 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
| 2696 _scan_obj_cl.objs_processed, | |
| 2697 ThreadLocalObjQueue::objs_enqueued); | |
| 2698 guarantee(_scan_obj_cl.objs_processed == | |
| 2699 ThreadLocalObjQueue::objs_enqueued, | |
| 2700 "Different number of objs processed and enqueued."); | |
| 2701 } | |
| 2702 #endif | |
| 2703 } | |
| 2704 | |
| 1044 | 2705 #ifndef PRODUCT |
| 2706 | |
| 1388 | 2707 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2708 private: |
| 2709 G1CollectedHeap* _g1h; | |
| 2710 outputStream* _out; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2711 VerifyOption _vo; |
| 1388 | 2712 bool _all; |
| 342 | 2713 |
| 2714 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2715 PrintReachableOopClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2716 VerifyOption vo, |
| 1388 | 2717 bool all) : |
| 1044 | 2718 _g1h(G1CollectedHeap::heap()), |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2719 _out(out), _vo(vo), _all(all) { } |
| 342 | 2720 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2721 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
|
2722 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
|
2723 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2724 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
|
2725 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2726 const char* str = NULL; |
| 2727 const char* str2 = ""; | |
| 2728 | |
| 1388 | 2729 if (obj == NULL) { |
| 2730 str = ""; | |
| 2731 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2732 str = " O"; | |
| 2733 } else { | |
| 342 | 2734 HeapRegion* hr = _g1h->heap_region_containing(obj); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2735 guarantee(hr != NULL, "invariant"); |
| 1044 | 2736 bool over_tams = false; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2737 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2738 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2739 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2740 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2741 over_tams = hr->obj_allocated_since_prev_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2742 marked = _g1h->isMarkedPrev(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2743 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2744 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2745 over_tams = hr->obj_allocated_since_next_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2746 marked = _g1h->isMarkedNext(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2747 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2748 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2749 marked = obj->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2750 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2751 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2752 ShouldNotReachHere(); |
| 1044 | 2753 } |
| 2754 | |
| 2755 if (over_tams) { | |
| 1388 | 2756 str = " >"; |
| 2757 if (marked) { | |
| 342 | 2758 str2 = " AND MARKED"; |
| 1044 | 2759 } |
| 1388 | 2760 } else if (marked) { |
| 2761 str = " M"; | |
| 1044 | 2762 } else { |
| 1388 | 2763 str = " NOT"; |
| 1044 | 2764 } |
| 342 | 2765 } |
| 2766 | |
| 1388 | 2767 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
| 342 | 2768 p, (void*) obj, str, str2); |
| 2769 } | |
| 2770 }; | |
| 2771 | |
| 1388 | 2772 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2773 private: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2774 G1CollectedHeap* _g1h; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2775 outputStream* _out; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2776 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2777 bool _all; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2778 HeapRegion* _hr; |
| 342 | 2779 |
| 2780 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2781 PrintReachableObjectClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2782 VerifyOption vo, |
| 1388 | 2783 bool all, |
| 2784 HeapRegion* hr) : | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2785 _g1h(G1CollectedHeap::heap()), |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2786 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2787 |
| 2788 void do_object(oop o) { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2789 bool over_tams = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2790 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2791 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2792 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2793 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2794 over_tams = _hr->obj_allocated_since_prev_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2795 marked = _g1h->isMarkedPrev(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2796 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2797 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2798 over_tams = _hr->obj_allocated_since_next_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2799 marked = _g1h->isMarkedNext(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2800 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2801 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2802 marked = o->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2803 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2804 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2805 ShouldNotReachHere(); |
| 1388 | 2806 } |
| 2807 bool print_it = _all || over_tams || marked; | |
| 2808 | |
| 2809 if (print_it) { | |
| 2810 _out->print_cr(" "PTR_FORMAT"%s", | |
| 2811 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2812 PrintReachableOopClosure oopCl(_out, _vo, _all); |
| 1388 | 2813 o->oop_iterate(&oopCl); |
| 2814 } | |
| 342 | 2815 } |
| 2816 }; | |
| 2817 | |
| 1388 | 2818 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2819 private: |
| 2820 outputStream* _out; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2821 VerifyOption _vo; |
| 1388 | 2822 bool _all; |
| 342 | 2823 |
| 2824 public: | |
| 2825 bool doHeapRegion(HeapRegion* hr) { | |
| 2826 HeapWord* b = hr->bottom(); | |
| 2827 HeapWord* e = hr->end(); | |
| 2828 HeapWord* t = hr->top(); | |
| 1044 | 2829 HeapWord* p = NULL; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2830 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2831 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2832 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2833 p = hr->prev_top_at_mark_start(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2834 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2835 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2836 p = hr->next_top_at_mark_start(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2837 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2838 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2839 // When we are verifying marking using the mark word |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2840 // TAMS has no relevance. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2841 assert(p == NULL, "post-condition"); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2842 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2843 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2844 ShouldNotReachHere(); |
| 1044 | 2845 } |
| 342 | 2846 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
| 1044 | 2847 "TAMS: "PTR_FORMAT, b, e, t, p); |
| 1388 | 2848 _out->cr(); |
| 2849 | |
| 2850 HeapWord* from = b; | |
| 2851 HeapWord* to = t; | |
| 2852 | |
| 2853 if (to > from) { | |
| 2854 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
| 2855 _out->cr(); | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2856 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2857 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2858 _out->cr(); | |
| 2859 } | |
| 342 | 2860 |
| 2861 return false; | |
| 2862 } | |
| 2863 | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2864 PrintReachableRegionClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2865 VerifyOption vo, |
| 1388 | 2866 bool all) : |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2867 _out(out), _vo(vo), _all(all) { } |
| 342 | 2868 }; |
| 2869 | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2870 static const char* verify_option_to_tams(VerifyOption vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2871 switch (vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2872 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2873 return "PTAMS"; |
|
6747fd0512e0
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changeset
|
2874 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
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|
2875 return "NTAMS"; |
|
6747fd0512e0
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parents:
3771
diff
changeset
|
2876 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
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|
2877 return "NONE"; |
|
6747fd0512e0
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parents:
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diff
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|
2878 } |
|
6747fd0512e0
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|
2879 } |
|
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|
2880 |
| 1388 | 2881 void ConcurrentMark::print_reachable(const char* str, |
|
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|
2882 VerifyOption vo, |
| 1388 | 2883 bool all) { |
| 2884 gclog_or_tty->cr(); | |
| 2885 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 2886 |
| 2887 if (G1PrintReachableBaseFile == NULL) { | |
| 2888 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 2889 return; | |
| 2890 } | |
| 2891 | |
| 2892 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 2893 (JVM_MAXPATHLEN - 1)) { | |
| 2894 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 2895 return; | |
| 2896 } | |
| 2897 | |
| 2898 char file_name[JVM_MAXPATHLEN]; | |
| 2899 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 2900 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 2901 | |
| 2902 fileStream fout(file_name); | |
| 2903 if (!fout.is_open()) { | |
| 2904 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 2905 return; | |
| 2906 } | |
| 2907 | |
| 2908 outputStream* out = &fout; | |
|
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|
2909 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
| 1044 | 2910 out->cr(); |
| 2911 | |
| 1388 | 2912 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2913 out->cr(); |
|
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|
2914 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 2915 _g1h->heap_region_iterate(&rcl); |
| 1044 | 2916 out->cr(); |
| 2917 | |
| 2918 gclog_or_tty->print_cr(" done"); | |
| 1388 | 2919 gclog_or_tty->flush(); |
| 342 | 2920 } |
| 2921 | |
| 1044 | 2922 #endif // PRODUCT |
| 2923 | |
| 342 | 2924 // This note is for drainAllSATBBuffers and the code in between. |
| 2925 // In the future we could reuse a task to do this work during an | |
| 2926 // evacuation pause (since now tasks are not active and can be claimed | |
| 2927 // during an evacuation pause). This was a late change to the code and | |
| 2928 // is currently not being taken advantage of. | |
| 2929 | |
| 2930 void ConcurrentMark::deal_with_reference(oop obj) { | |
| 3771 | 2931 if (verbose_high()) { |
| 342 | 2932 gclog_or_tty->print_cr("[global] we're dealing with reference "PTR_FORMAT, |
| 2933 (void*) obj); | |
| 3771 | 2934 } |
| 342 | 2935 |
| 2936 HeapWord* objAddr = (HeapWord*) obj; | |
|
845
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|
2937 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
| 342 | 2938 if (_g1h->is_in_g1_reserved(objAddr)) { |
| 3771 | 2939 assert(obj != NULL, "null check is implicit"); |
| 2940 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
| 2941 // Only get the containing region if the object is not marked on the | |
| 2942 // bitmap (otherwise, it's a waste of time since we won't do | |
| 2943 // anything with it). | |
| 2944 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
| 2945 if (!hr->obj_allocated_since_next_marking(obj)) { | |
| 2946 if (verbose_high()) { | |
| 2947 gclog_or_tty->print_cr("[global] "PTR_FORMAT" is not considered " | |
| 2948 "marked", (void*) obj); | |
| 2949 } | |
| 2950 | |
| 2951 // we need to mark it first | |
| 2952 if (_nextMarkBitMap->parMark(objAddr)) { | |
| 2953 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 2954 // CAS done in parMark(objAddr) above | |
| 2955 HeapWord* finger = _finger; | |
| 2956 if (objAddr < finger) { | |
| 2957 if (verbose_high()) { | |
| 2958 gclog_or_tty->print_cr("[global] below the global finger " | |
| 2959 "("PTR_FORMAT"), pushing it", finger); | |
| 2960 } | |
| 2961 if (!mark_stack_push(obj)) { | |
| 2962 if (verbose_low()) { | |
| 2963 gclog_or_tty->print_cr("[global] global stack overflow during " | |
| 2964 "deal_with_reference"); | |
| 2965 } | |
| 2966 } | |
| 342 | 2967 } |
| 2968 } | |
| 2969 } | |
| 2970 } | |
| 2971 } | |
| 2972 } | |
| 2973 | |
|
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|
2974 class CMGlobalObjectClosure : public ObjectClosure { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
2975 private: |
|
d30fa85f9994
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changeset
|
2976 ConcurrentMark* _cm; |
|
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|
2977 |
|
d30fa85f9994
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diff
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|
2978 public: |
|
d30fa85f9994
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changeset
|
2979 void do_object(oop obj) { |
|
d30fa85f9994
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diff
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|
2980 _cm->deal_with_reference(obj); |
|
d30fa85f9994
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diff
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|
2981 } |
|
d30fa85f9994
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diff
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|
2982 |
|
d30fa85f9994
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diff
changeset
|
2983 CMGlobalObjectClosure(ConcurrentMark* cm) : _cm(cm) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
2984 }; |
|
d30fa85f9994
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diff
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|
2985 |
| 342 | 2986 void ConcurrentMark::drainAllSATBBuffers() { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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changeset
|
2987 guarantee(false, "drainAllSATBBuffers(): don't call this any more"); |
|
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diff
changeset
|
2988 |
| 342 | 2989 CMGlobalObjectClosure oc(this); |
| 2990 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 2991 satb_mq_set.set_closure(&oc); | |
| 2992 | |
| 2993 while (satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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|
2994 if (verbose_medium()) { |
| 342 | 2995 gclog_or_tty->print_cr("[global] processed an SATB buffer"); |
|
3776
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|
2996 } |
| 342 | 2997 } |
| 2998 | |
| 2999 // no need to check whether we should do this, as this is only | |
| 3000 // called during an evacuation pause | |
| 3001 satb_mq_set.iterate_closure_all_threads(); | |
| 3002 | |
| 3003 satb_mq_set.set_closure(NULL); | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3004 assert(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 3005 } |
| 3006 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
3007 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 3008 // Note we are overriding the read-only view of the prev map here, via |
| 3009 // the cast. | |
| 3010 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3011 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3012 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3013 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 3014 _nextMarkBitMap->clearRange(mr); |
| 3015 } | |
| 3016 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3017 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3018 clearRangePrevBitmap(mr); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3019 clearRangeNextBitmap(mr); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3020 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3021 |
| 342 | 3022 HeapRegion* |
| 3023 ConcurrentMark::claim_region(int task_num) { | |
| 3024 // "checkpoint" the finger | |
| 3025 HeapWord* finger = _finger; | |
| 3026 | |
| 3027 // _heap_end will not change underneath our feet; it only changes at | |
| 3028 // yield points. | |
| 3029 while (finger < _heap_end) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
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|
3030 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 3031 |
| 3771 | 3032 // Note on how this code handles humongous regions. In the |
| 3033 // normal case the finger will reach the start of a "starts | |
| 3034 // humongous" (SH) region. Its end will either be the end of the | |
| 3035 // last "continues humongous" (CH) region in the sequence, or the | |
| 3036 // standard end of the SH region (if the SH is the only region in | |
| 3037 // the sequence). That way claim_region() will skip over the CH | |
| 3038 // regions. However, there is a subtle race between a CM thread | |
| 3039 // executing this method and a mutator thread doing a humongous | |
| 3040 // object allocation. The two are not mutually exclusive as the CM | |
| 3041 // thread does not need to hold the Heap_lock when it gets | |
| 3042 // here. So there is a chance that claim_region() will come across | |
| 3043 // a free region that's in the progress of becoming a SH or a CH | |
| 3044 // region. In the former case, it will either | |
| 3045 // a) Miss the update to the region's end, in which case it will | |
| 3046 // visit every subsequent CH region, will find their bitmaps | |
| 3047 // empty, and do nothing, or | |
| 3048 // b) Will observe the update of the region's end (in which case | |
| 3049 // it will skip the subsequent CH regions). | |
| 3050 // If it comes across a region that suddenly becomes CH, the | |
| 3051 // scenario will be similar to b). So, the race between | |
| 3052 // claim_region() and a humongous object allocation might force us | |
| 3053 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 3054 // iterations) but it should not introduce and correctness issues. | |
| 3055 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
| 342 | 3056 HeapWord* bottom = curr_region->bottom(); |
| 3057 HeapWord* end = curr_region->end(); | |
| 3058 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 3059 | |
| 3771 | 3060 if (verbose_low()) { |
| 342 | 3061 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
| 3062 "["PTR_FORMAT", "PTR_FORMAT"), " | |
| 3063 "limit = "PTR_FORMAT, | |
| 3064 task_num, curr_region, bottom, end, limit); | |
| 3771 | 3065 } |
| 3066 | |
| 3067 // Is the gap between reading the finger and doing the CAS too long? | |
| 3068 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 342 | 3069 if (res == finger) { |
| 3070 // we succeeded | |
| 3071 | |
| 3072 // notice that _finger == end cannot be guaranteed here since, | |
| 3073 // someone else might have moved the finger even further | |
|
1023
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tonyp
parents:
1022
diff
changeset
|
3074 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 3075 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
3076 if (verbose_low()) { |
| 342 | 3077 gclog_or_tty->print_cr("[%d] we were successful with region = " |
| 3078 PTR_FORMAT, task_num, curr_region); | |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
3079 } |
| 342 | 3080 |
| 3081 if (limit > bottom) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
3082 if (verbose_low()) { |
| 342 | 3083 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
| 3084 "returning it ", task_num, curr_region); | |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3085 } |
| 342 | 3086 return curr_region; |
| 3087 } else { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3088 assert(limit == bottom, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3089 "the region limit should be at bottom"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
3090 if (verbose_low()) { |
| 342 | 3091 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
| 3092 "returning NULL", task_num, curr_region); | |
|
3776
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tonyp
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3772
diff
changeset
|
3093 } |
| 342 | 3094 // we return NULL and the caller should try calling |
| 3095 // claim_region() again. | |
| 3096 return NULL; | |
| 3097 } | |
| 3098 } else { | |
|
1023
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1022
diff
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|
3099 assert(_finger > finger, "the finger should have moved forward"); |
|
3776
23d434c6290d
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tonyp
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3772
diff
changeset
|
3100 if (verbose_low()) { |
| 342 | 3101 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
| 3102 "global finger = "PTR_FORMAT", " | |
| 3103 "our finger = "PTR_FORMAT, | |
| 3104 task_num, _finger, finger); | |
|
3776
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|
3105 } |
| 342 | 3106 |
| 3107 // read it again | |
| 3108 finger = _finger; | |
| 3109 } | |
| 3110 } | |
| 3111 | |
| 3112 return NULL; | |
| 3113 } | |
| 3114 | |
|
1835
4805b9f4779e
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1833
diff
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|
3115 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4783
diff
changeset
|
3116 guarantee(false, "invalidate_aborted_regions_in_cset(): " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4783
diff
changeset
|
3117 "don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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changeset
|
3118 |
|
1835
4805b9f4779e
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1833
diff
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|
3119 bool result = false; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
3120 for (int i = 0; i < (int)_max_task_num; ++i) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
3121 CMTask* the_task = _tasks[i]; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
3122 MemRegion mr = the_task->aborted_region(); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
3123 if (mr.start() != NULL) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
3124 assert(mr.end() != NULL, "invariant"); |
|
4805b9f4779e
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1833
diff
changeset
|
3125 assert(mr.word_size() > 0, "invariant"); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
3126 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
|
4805b9f4779e
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johnc
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diff
changeset
|
3127 assert(hr != NULL, "invariant"); |
|
4805b9f4779e
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1833
diff
changeset
|
3128 if (hr->in_collection_set()) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
3129 // The region points into the collection set |
|
4805b9f4779e
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1833
diff
changeset
|
3130 the_task->set_aborted_region(MemRegion()); |
|
4805b9f4779e
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diff
changeset
|
3131 result = true; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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diff
changeset
|
3132 } |
|
4805b9f4779e
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diff
changeset
|
3133 } |
|
4805b9f4779e
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diff
changeset
|
3134 } |
|
4805b9f4779e
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diff
changeset
|
3135 return result; |
|
4805b9f4779e
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1833
diff
changeset
|
3136 } |
|
4805b9f4779e
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1833
diff
changeset
|
3137 |
|
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|
3138 bool ConcurrentMark::has_aborted_regions() { |
|
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|
3139 for (int i = 0; i < (int)_max_task_num; ++i) { |
|
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|
3140 CMTask* the_task = _tasks[i]; |
|
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|
3141 MemRegion mr = the_task->aborted_region(); |
|
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|
3142 if (mr.start() != NULL) { |
|
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|
3143 assert(mr.end() != NULL, "invariant"); |
|
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|
3144 assert(mr.word_size() > 0, "invariant"); |
|
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|
3145 return true; |
|
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|
3146 } |
|
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|
3147 } |
|
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|
3148 return false; |
|
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|
3149 } |
|
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|
3150 |
| 342 | 3151 void ConcurrentMark::oops_do(OopClosure* cl) { |
|
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|
3152 if (_markStack.size() > 0 && verbose_low()) { |
| 342 | 3153 gclog_or_tty->print_cr("[global] scanning the global marking stack, " |
| 3154 "size = %d", _markStack.size()); | |
|
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|
3155 } |
| 342 | 3156 // we first iterate over the contents of the mark stack... |
| 3157 _markStack.oops_do(cl); | |
| 3158 | |
| 3159 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3160 OopTaskQueue* queue = _task_queues->queue((int)i); | |
| 3161 | |
|
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|
3162 if (queue->size() > 0 && verbose_low()) { |
| 342 | 3163 gclog_or_tty->print_cr("[global] scanning task queue of task %d, " |
| 3164 "size = %d", i, queue->size()); | |
|
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|
3165 } |
| 342 | 3166 |
| 3167 // ...then over the contents of the all the task queues. | |
| 3168 queue->oops_do(cl); | |
| 3169 } | |
|
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|
3170 } |
|
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|
3171 |
|
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|
3172 #ifndef PRODUCT |
|
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|
3173 enum VerifyNoCSetOopsPhase { |
|
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|
3174 VerifyNoCSetOopsStack, |
|
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|
3175 VerifyNoCSetOopsQueues, |
|
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|
3176 VerifyNoCSetOopsSATBCompleted, |
|
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|
3177 VerifyNoCSetOopsSATBThread |
|
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|
3178 }; |
|
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|
3179 |
|
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|
3180 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
|
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|
3181 private: |
|
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|
3182 G1CollectedHeap* _g1h; |
|
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|
3183 VerifyNoCSetOopsPhase _phase; |
|
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|
3184 int _info; |
|
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|
3185 |
|
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|
3186 const char* phase_str() { |
|
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|
3187 switch (_phase) { |
|
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|
3188 case VerifyNoCSetOopsStack: return "Stack"; |
|
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|
3189 case VerifyNoCSetOopsQueues: return "Queue"; |
|
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|
3190 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
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|
3191 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
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|
3192 default: ShouldNotReachHere(); |
|
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|
3193 } |
|
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|
3194 return NULL; |
|
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|
3195 } |
|
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|
3196 |
|
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|
3197 void do_object_work(oop obj) { |
|
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|
3198 guarantee(!_g1h->obj_in_cs(obj), |
|
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|
3199 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
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|
3200 (void*) obj, phase_str(), _info)); |
|
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|
3201 } |
|
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|
3202 |
|
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|
3203 public: |
|
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|
3204 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
|
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|
3205 |
|
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|
3206 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
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|
3207 _phase = phase; |
|
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|
3208 _info = info; |
|
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|
3209 } |
|
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|
3210 |
|
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|
3211 virtual void do_oop(oop* p) { |
|
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|
3212 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
3213 do_object_work(obj); |
|
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|
3214 } |
|
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|
3215 |
|
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|
3216 virtual void do_oop(narrowOop* p) { |
|
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|
3217 // We should not come across narrow oops while scanning marking |
|
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|
3218 // stacks and SATB buffers. |
|
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|
3219 ShouldNotReachHere(); |
|
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|
3220 } |
|
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|
3221 |
|
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|
3222 virtual void do_object(oop obj) { |
|
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|
3223 do_object_work(obj); |
|
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|
3224 } |
|
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|
3225 }; |
|
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|
3226 |
|
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|
3227 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
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|
3228 bool verify_enqueued_buffers, |
|
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|
3229 bool verify_thread_buffers, |
|
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|
3230 bool verify_fingers) { |
|
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|
3231 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
|
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|
3232 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
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|
3233 return; |
| 342 | 3234 } |
|
1835
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|
3235 |
|
4787
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|
3236 VerifyNoCSetOopsClosure cl; |
|
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|
3237 |
|
2ace1c4ee8da
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|
3238 if (verify_stacks) { |
|
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|
3239 // Verify entries on the global mark stack |
|
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|
3240 cl.set_phase(VerifyNoCSetOopsStack); |
|
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|
3241 _markStack.oops_do(&cl); |
|
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|
3242 |
|
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|
3243 // Verify entries on the task queues |
|
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|
3244 for (int i = 0; i < (int) _max_task_num; i += 1) { |
|
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|
3245 cl.set_phase(VerifyNoCSetOopsQueues, i); |
|
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|
3246 OopTaskQueue* queue = _task_queues->queue(i); |
|
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|
3247 queue->oops_do(&cl); |
|
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|
3248 } |
|
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|
3249 } |
|
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|
3250 |
|
2ace1c4ee8da
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|
3251 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
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|
3252 |
|
2ace1c4ee8da
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|
3253 // Verify entries on the enqueued SATB buffers |
|
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|
3254 if (verify_enqueued_buffers) { |
|
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|
3255 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
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|
3256 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
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|
3257 } |
|
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|
3258 |
|
2ace1c4ee8da
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|
3259 // Verify entries on the per-thread SATB buffers |
|
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|
3260 if (verify_thread_buffers) { |
|
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|
3261 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
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|
3262 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
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|
3263 } |
|
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|
3264 |
|
4787
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|
3265 if (verify_fingers) { |
|
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|
3266 // Verify the global finger |
|
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|
3267 HeapWord* global_finger = finger(); |
|
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|
3268 if (global_finger != NULL && global_finger < _heap_end) { |
|
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|
3269 // The global finger always points to a heap region boundary. We |
|
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changeset
|
3270 // use heap_region_containing_raw() to get the containing region |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3271 // given that the global finger could be pointing to a free region |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3272 // which subsequently becomes continues humongous. If that |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3273 // happens, heap_region_containing() will return the bottom of the |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3274 // corresponding starts humongous region and the check below will |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3275 // not hold any more. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3276 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3277 guarantee(global_finger == global_hr->bottom(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3278 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3279 global_finger, HR_FORMAT_PARAMS(global_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3280 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3281 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3282 // Verify the task fingers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3283 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3284 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3285 CMTask* task = _tasks[i]; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3286 HeapWord* task_finger = task->finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3287 if (task_finger != NULL && task_finger < _heap_end) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3288 // See above note on the global finger verification. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3289 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3290 guarantee(task_finger == task_hr->bottom() || |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3291 !task_hr->in_collection_set(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3292 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3293 task_finger, HR_FORMAT_PARAMS(task_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3294 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3295 } |
|
2ace1c4ee8da
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parents:
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diff
changeset
|
3296 } |
| 342 | 3297 } |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
3298 #endif // PRODUCT |
| 342 | 3299 |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3300 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
| 342 | 3301 _markStack.setEmpty(); |
| 3302 _markStack.clear_overflow(); | |
| 3303 _regionStack.setEmpty(); | |
| 3304 _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
|
3305 if (clear_overflow) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3306 clear_has_overflown(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3307 } else { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3308 assert(has_overflown(), "pre-condition"); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3309 } |
| 342 | 3310 _finger = _heap_start; |
| 3311 | |
| 3312 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3313 OopTaskQueue* queue = _task_queues->queue(i); | |
| 3314 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
|
3315 // 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
|
3316 _tasks[i]->clear_aborted_region(); |
| 342 | 3317 } |
| 3318 } | |
| 3319 | |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
changeset
|
3320 // Aggregate the counting data that was constructed concurrently |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
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|
3321 // with marking. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3322 class AggregateCountDataHRClosure: public HeapRegionClosure { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3323 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3324 BitMap* _cm_card_bm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3325 size_t _max_task_num; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3326 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3327 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3328 AggregateCountDataHRClosure(ConcurrentMark *cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3329 BitMap* cm_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3330 size_t max_task_num) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3331 _cm(cm), _cm_card_bm(cm_card_bm), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3332 _max_task_num(max_task_num) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3333 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3334 bool is_card_aligned(HeapWord* p) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3335 return ((uintptr_t(p) & (CardTableModRefBS::card_size - 1)) == 0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3336 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3337 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3338 bool doHeapRegion(HeapRegion* hr) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3339 if (hr->continuesHumongous()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3340 // We will ignore these here and process them when their |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3341 // associated "starts humongous" region is processed. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3342 // Note that we cannot rely on their associated |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3343 // "starts humongous" region to have their bit set to 1 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3344 // since, due to the region chunking in the parallel region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3345 // iteration, a "continues humongous" region might be visited |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3346 // before its associated "starts humongous". |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3347 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3348 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3349 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3350 HeapWord* start = hr->bottom(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3351 HeapWord* limit = hr->next_top_at_mark_start(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3352 HeapWord* end = hr->end(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3353 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3354 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3355 err_msg("Preconditions not met - " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3356 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3357 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3358 start, limit, hr->top(), hr->end())); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3359 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3360 assert(hr->next_marked_bytes() == 0, "Precondition"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3361 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3362 if (start == limit) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3363 // NTAMS of this region has not been set so nothing to do. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3364 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3365 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3366 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3367 assert(is_card_aligned(start), "sanity"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3368 assert(is_card_aligned(end), "sanity"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3369 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3370 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3371 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3372 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3373 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3374 // If ntams is not card aligned then we bump the index for |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3375 // limit so that we get the card spanning ntams. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3376 if (!is_card_aligned(limit)) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3377 limit_idx += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3378 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3379 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3380 assert(limit_idx <= end_idx, "or else use atomics"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3381 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3382 // Aggregate the "stripe" in the count data associated with hr. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3383 size_t hrs_index = hr->hrs_index(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3384 size_t marked_bytes = 0; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3385 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3386 for (int i = 0; (size_t)i < _max_task_num; i += 1) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3387 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3388 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3389 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3390 // Fetch the marked_bytes in this region for task i and |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3391 // add it to the running total for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3392 marked_bytes += marked_bytes_array[hrs_index]; |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3393 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3394 // Now union the bitmaps[0,max_task_num)[start_idx..limit_idx) |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3395 // into the global card bitmap. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3396 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3397 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3398 while (scan_idx < limit_idx) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3399 assert(task_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3400 _cm_card_bm->set_bit(scan_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3401 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3402 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3403 // BitMap::get_next_one_offset() can handle the case when |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3404 // its left_offset parameter is greater than its right_offset |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3405 // parameter. If does, however, have an early exit if |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3406 // left_offset == right_offset. So let's limit the value |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3407 // passed in for left offset here. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3408 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3409 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3410 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3411 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3412 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3413 // Update the marked bytes for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3414 hr->add_to_marked_bytes(marked_bytes); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3415 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3416 // Now set the top at count to NTAMS. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3417 hr->set_top_at_conc_mark_count(limit); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3418 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3419 // Next heap region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3420 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3421 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3422 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3423 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3424 class G1AggregateCountDataTask: public AbstractGangTask { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3425 protected: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3426 G1CollectedHeap* _g1h; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3427 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3428 BitMap* _cm_card_bm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3429 size_t _max_task_num; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3430 int _active_workers; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3431 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3432 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3433 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3434 ConcurrentMark* cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3435 BitMap* cm_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3436 size_t max_task_num, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3437 int n_workers) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3438 AbstractGangTask("Count Aggregation"), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3439 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3440 _max_task_num(max_task_num), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3441 _active_workers(n_workers) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3442 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3443 void work(uint worker_id) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3444 AggregateCountDataHRClosure cl(_cm, _cm_card_bm, _max_task_num); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3445 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3446 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3447 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3448 _active_workers, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3449 HeapRegion::AggregateCountClaimValue); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3450 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3451 _g1h->heap_region_iterate(&cl); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3452 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3453 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3454 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3455 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3456 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3457 void ConcurrentMark::aggregate_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3458 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3459 _g1h->workers()->active_workers() : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3460 1); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3461 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3462 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3463 _max_task_num, n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3464 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3465 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3466 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3467 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3468 _g1h->set_par_threads(n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3469 _g1h->workers()->run_task(&g1_par_agg_task); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3470 _g1h->set_par_threads(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3471 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3472 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3473 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3474 _g1h->reset_heap_region_claim_values(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3475 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3476 g1_par_agg_task.work(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3477 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3478 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3479 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3480 // Clear the per-worker arrays used to store the per-region counting data |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3481 void ConcurrentMark::clear_all_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3482 // Clear the global card bitmap - it will be filled during |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3483 // liveness count aggregation (during remark) and the |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3484 // final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3485 _card_bm.clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3486 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3487 // Clear the global region bitmap - it will be filled as part |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3488 // of the final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3489 _region_bm.clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3490 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3491 size_t max_regions = _g1h->max_regions(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3492 assert(_max_task_num != 0, "unitialized"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3493 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3494 for (int i = 0; (size_t) i < _max_task_num; i += 1) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3495 BitMap* task_card_bm = count_card_bitmap_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3496 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3497 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3498 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3499 assert(marked_bytes_array != NULL, "uninitialized"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3500 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3501 memset(marked_bytes_array, 0, (max_regions * sizeof(size_t))); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3502 task_card_bm->clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3503 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3504 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3505 |
| 342 | 3506 void ConcurrentMark::print_stats() { |
| 3507 if (verbose_stats()) { | |
| 3508 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3509 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3510 _tasks[i]->print_stats(); | |
| 3511 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3512 } | |
| 3513 } | |
| 3514 } | |
| 3515 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3516 // 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
|
3517 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3518 class CSetMarkOopClosure: public OopClosure { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3519 friend class CSetMarkBitMapClosure; |
| 342 | 3520 |
| 3521 G1CollectedHeap* _g1h; | |
| 3522 CMBitMap* _bm; | |
| 3523 ConcurrentMark* _cm; | |
| 3524 oop* _ms; | |
| 3525 jint* _array_ind_stack; | |
| 3526 int _ms_size; | |
| 3527 int _ms_ind; | |
| 3528 int _array_increment; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3529 uint _worker_id; |
| 342 | 3530 |
| 3531 bool push(oop obj, int arr_ind = 0) { | |
| 3532 if (_ms_ind == _ms_size) { | |
| 3533 gclog_or_tty->print_cr("Mark stack is full."); | |
| 3534 return false; | |
| 3535 } | |
| 3536 _ms[_ms_ind] = obj; | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3537 if (obj->is_objArray()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3538 _array_ind_stack[_ms_ind] = arr_ind; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3539 } |
| 342 | 3540 _ms_ind++; |
| 3541 return true; | |
| 3542 } | |
| 3543 | |
| 3544 oop pop() { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
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changeset
|
3545 if (_ms_ind == 0) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
3546 return NULL; |
|
23d434c6290d
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3772
diff
changeset
|
3547 } else { |
| 342 | 3548 _ms_ind--; |
| 3549 return _ms[_ms_ind]; | |
| 3550 } | |
| 3551 } | |
| 3552 | |
|
845
df6caf649ff7
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diff
changeset
|
3553 template <class T> bool drain() { |
| 342 | 3554 while (_ms_ind > 0) { |
| 3555 oop obj = pop(); | |
| 3556 assert(obj != NULL, "Since index was non-zero."); | |
| 3557 if (obj->is_objArray()) { | |
| 3558 jint arr_ind = _array_ind_stack[_ms_ind]; | |
| 3559 objArrayOop aobj = objArrayOop(obj); | |
| 3560 jint len = aobj->length(); | |
| 3561 jint next_arr_ind = arr_ind + _array_increment; | |
| 3562 if (next_arr_ind < len) { | |
| 3563 push(obj, next_arr_ind); | |
| 3564 } | |
| 3565 // Now process this portion of this one. | |
| 3566 int lim = MIN2(next_arr_ind, len); | |
| 3567 for (int j = arr_ind; j < lim; j++) { | |
|
912
308762b2bf14
6872000: G1: compilation fails on linux/older gcc
apetrusenko
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866
diff
changeset
|
3568 do_oop(aobj->objArrayOopDesc::obj_at_addr<T>(j)); |
| 342 | 3569 } |
| 3570 } else { | |
| 3571 obj->oop_iterate(this); | |
| 3572 } | |
| 3573 if (abort()) return false; | |
| 3574 } | |
| 3575 return true; | |
| 3576 } | |
| 3577 | |
| 3578 public: | |
|
4728
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7121618: Change type of number of GC workers to unsigned int.
jmasa
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changeset
|
3579 CSetMarkOopClosure(ConcurrentMark* cm, int ms_size, uint worker_id) : |
| 342 | 3580 _g1h(G1CollectedHeap::heap()), |
| 3581 _cm(cm), | |
| 3582 _bm(cm->nextMarkBitMap()), | |
| 3583 _ms_size(ms_size), _ms_ind(0), | |
| 3584 _ms(NEW_C_HEAP_ARRAY(oop, ms_size)), | |
| 3585 _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
|
3586 _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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diff
changeset
|
3587 _worker_id(worker_id) { } |
|
4097
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diff
changeset
|
3588 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3589 ~CSetMarkOopClosure() { |
| 342 | 3590 FREE_C_HEAP_ARRAY(oop, _ms); |
| 3591 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
| 3592 } | |
| 3593 | |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
3594 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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changeset
|
3595 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
3596 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3597 template <class T> void do_oop_work(T* p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
3598 T heap_oop = oopDesc::load_heap_oop(p); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
3599 if (oopDesc::is_null(heap_oop)) return; |
|
df6caf649ff7
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|
3600 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 342 | 3601 if (obj->is_forwarded()) { |
| 3602 // If the object has already been forwarded, we have to make sure | |
| 3603 // that it's marked. So follow the forwarding pointer. Note that | |
| 3604 // this does the right thing for self-forwarding pointers in the | |
| 3605 // evacuation failure case. | |
| 3606 obj = obj->forwardee(); | |
| 3607 } | |
| 3608 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
| 3609 if (hr != NULL) { | |
| 3610 if (hr->in_collection_set()) { | |
| 3611 if (_g1h->is_obj_ill(obj)) { | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3612 if (_bm->parMark((HeapWord*)obj)) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3613 if (!push(obj)) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
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diff
changeset
|
3614 gclog_or_tty->print_cr("Setting abort in CSetMarkOopClosure because push failed."); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3615 set_abort(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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diff
changeset
|
3616 } |
| 342 | 3617 } |
| 3618 } | |
| 3619 } else { | |
| 3620 // Outside the collection set; we need to gray it | |
| 3621 _cm->deal_with_reference(obj); | |
| 3622 } | |
| 3623 } | |
| 3624 } | |
| 3625 }; | |
| 3626 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3627 class CSetMarkBitMapClosure: public BitMapClosure { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3628 G1CollectedHeap* _g1h; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3629 CMBitMap* _bitMap; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
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diff
changeset
|
3630 ConcurrentMark* _cm; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3631 CSetMarkOopClosure _oop_cl; |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
3632 uint _worker_id; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
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diff
changeset
|
3633 |
| 342 | 3634 public: |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3635 CSetMarkBitMapClosure(ConcurrentMark* cm, int ms_size, int worker_id) : |
| 342 | 3636 _g1h(G1CollectedHeap::heap()), |
| 3637 _bitMap(cm->nextMarkBitMap()), | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
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diff
changeset
|
3638 _oop_cl(cm, ms_size, worker_id), |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3639 _worker_id(worker_id) { } |
| 342 | 3640 |
| 3641 bool do_bit(size_t offset) { | |
| 3642 // convert offset into a HeapWord* | |
| 3643 HeapWord* addr = _bitMap->offsetToHeapWord(offset); | |
| 3644 assert(_bitMap->endWord() && addr < _bitMap->endWord(), | |
| 3645 "address out of range"); | |
| 3646 assert(_bitMap->isMarked(addr), "tautology"); | |
| 3647 oop obj = oop(addr); | |
| 3648 if (!obj->is_forwarded()) { | |
| 3649 if (!_oop_cl.push(obj)) return false; | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
changeset
|
3650 if (UseCompressedOops) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3651 if (!_oop_cl.drain<narrowOop>()) return false; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3652 } else { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3653 if (!_oop_cl.drain<oop>()) return false; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3654 } |
| 342 | 3655 } |
| 3656 // Otherwise... | |
| 3657 return true; | |
| 3658 } | |
| 3659 }; | |
| 3660 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3661 class CompleteMarkingInCSetHRClosure: public HeapRegionClosure { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3662 CMBitMap* _bm; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3663 CSetMarkBitMapClosure _bit_cl; |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3664 uint _worker_id; |
|
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3665 |
| 342 | 3666 enum SomePrivateConstants { |
| 3667 MSSize = 1000 | |
| 3668 }; | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3669 |
| 342 | 3670 public: |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3671 CompleteMarkingInCSetHRClosure(ConcurrentMark* cm, int worker_id) : |
| 342 | 3672 _bm(cm->nextMarkBitMap()), |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3673 _bit_cl(cm, MSSize, worker_id), |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3674 _worker_id(worker_id) { } |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3675 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3676 bool doHeapRegion(HeapRegion* hr) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3677 if (hr->claimHeapRegion(HeapRegion::CompleteMarkCSetClaimValue)) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3678 // The current worker has successfully claimed the region. |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3679 if (!hr->evacuation_failed()) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3680 MemRegion mr = MemRegion(hr->bottom(), hr->next_top_at_mark_start()); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
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diff
changeset
|
3681 if (!mr.is_empty()) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3682 bool done = false; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3683 while (!done) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3684 done = _bm->iterate(&_bit_cl, mr); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3685 } |
| 342 | 3686 } |
| 3687 } | |
| 3688 } | |
| 3689 return false; | |
| 3690 } | |
| 3691 }; | |
| 3692 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3693 class G1ParCompleteMarkInCSetTask: public AbstractGangTask { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3694 protected: |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3695 G1CollectedHeap* _g1h; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3696 ConcurrentMark* _cm; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3697 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
changeset
|
3698 public: |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3699 G1ParCompleteMarkInCSetTask(G1CollectedHeap* g1h, |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
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diff
changeset
|
3700 ConcurrentMark* cm) : |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3701 AbstractGangTask("Complete Mark in CSet"), |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3702 _g1h(g1h), _cm(cm) { } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3703 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
3704 void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3705 CompleteMarkingInCSetHRClosure cmplt(_cm, worker_id); |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3706 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id); |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3707 _g1h->collection_set_iterate_from(hr, &cmplt); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
changeset
|
3708 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
3709 }; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3710 |
| 342 | 3711 void ConcurrentMark::complete_marking_in_collection_set() { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3712 guarantee(false, "complete_marking_in_collection_set(): " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3713 "don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3714 |
| 342 | 3715 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 3716 | |
| 3717 if (!g1h->mark_in_progress()) { | |
| 3718 g1h->g1_policy()->record_mark_closure_time(0.0); | |
| 3719 return; | |
| 3720 } | |
| 3721 | |
| 3722 double start = os::elapsedTime(); | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
3723 G1ParCompleteMarkInCSetTask complete_mark_task(g1h, this); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
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diff
changeset
|
3724 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3725 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
3726 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
3727 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 4711 | 3728 int n_workers = g1h->workers()->active_workers(); |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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changeset
|
3729 g1h->set_par_threads(n_workers); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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diff
changeset
|
3730 g1h->workers()->run_task(&complete_mark_task); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3731 g1h->set_par_threads(0); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
3732 } else { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
3733 complete_mark_task.work(0); |
| 342 | 3734 } |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
3735 |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3736 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::CompleteMarkCSetClaimValue), "sanity"); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
3737 |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4735
diff
changeset
|
3738 // Reset the claim values in the regions in the collection set. |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4735
diff
changeset
|
3739 g1h->reset_cset_heap_region_claim_values(); |
|
4097
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|
3740 |
|
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|
3741 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
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3742 |
| 342 | 3743 double end_time = os::elapsedTime(); |
| 3744 double elapsed_time_ms = (end_time - start) * 1000.0; | |
| 3745 g1h->g1_policy()->record_mark_closure_time(elapsed_time_ms); | |
| 3746 } | |
| 3747 | |
| 3748 // The next two methods deal with the following optimisation. Some | |
| 3749 // objects are gray by being marked and located above the finger. If | |
| 3750 // they are copied, during an evacuation pause, below the finger then | |
| 3751 // the need to be pushed on the stack. The observation is that, if | |
| 3752 // there are no regions in the collection set located above the | |
| 3753 // finger, then the above cannot happen, hence we do not need to | |
| 3754 // explicitly gray any objects when copying them to below the | |
| 3755 // finger. The global stack will be scanned to ensure that, if it | |
| 3756 // points to objects being copied, it will update their | |
| 3757 // location. There is a tricky situation with the gray objects in | |
| 3758 // region stack that are being coped, however. See the comment in | |
| 3759 // newCSet(). | |
| 3760 | |
| 3761 void ConcurrentMark::newCSet() { | |
|
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|
3762 guarantee(false, "newCSet(): don't call this any more"); |
|
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|
3763 |
|
3776
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|
3764 if (!concurrent_marking_in_progress()) { |
| 342 | 3765 // nothing to do if marking is not in progress |
| 3766 return; | |
|
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|
3767 } |
| 342 | 3768 |
| 3769 // find what the lowest finger is among the global and local fingers | |
| 3770 _min_finger = _finger; | |
| 3771 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3772 CMTask* task = _tasks[i]; | |
| 3773 HeapWord* task_finger = task->finger(); | |
|
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|
3774 if (task_finger != NULL && task_finger < _min_finger) { |
| 342 | 3775 _min_finger = task_finger; |
|
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|
3776 } |
| 342 | 3777 } |
| 3778 | |
| 3779 _should_gray_objects = false; | |
| 3780 | |
| 3781 // This fixes a very subtle and fustrating bug. It might be the case | |
| 3782 // that, during en evacuation pause, heap regions that contain | |
| 3783 // objects that are gray (by being in regions contained in the | |
| 3784 // region stack) are included in the collection set. Since such gray | |
| 3785 // objects will be moved, and because it's not easy to redirect | |
| 3786 // region stack entries to point to a new location (because objects | |
| 3787 // in one region might be scattered to multiple regions after they | |
| 3788 // are copied), one option is to ensure that all marked objects | |
| 3789 // copied during a pause are pushed on the stack. Notice, however, | |
| 3790 // that this problem can only happen when the region stack is not | |
| 3791 // empty during an evacuation pause. So, we make the fix a bit less | |
| 3792 // conservative and ensure that regions are pushed on the stack, | |
| 3793 // irrespective whether all collection set regions are below the | |
| 3794 // finger, if the region stack is not empty. This is expected to be | |
| 3795 // a rare case, so I don't think it's necessary to be smarted about it. | |
|
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|
3796 if (!region_stack_empty() || has_aborted_regions()) { |
| 342 | 3797 _should_gray_objects = true; |
|
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|
3798 } |
| 342 | 3799 } |
| 3800 | |
| 3801 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
|
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3802 guarantee(false, "registerCSetRegion(): don't call this any more"); |
|
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3803 |
|
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|
3804 if (!concurrent_marking_in_progress()) return; |
| 342 | 3805 |
| 3806 HeapWord* region_end = hr->end(); | |
|
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|
3807 if (region_end > _min_finger) { |
| 342 | 3808 _should_gray_objects = true; |
|
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|
3809 } |
| 342 | 3810 } |
| 3811 | |
|
3378
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|
3812 // Resets the region fields of active CMTasks whose values point |
|
69293e516993
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|
3813 // into the collection set. |
|
69293e516993
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|
3814 void ConcurrentMark::reset_active_task_region_fields_in_cset() { |
|
4787
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|
3815 guarantee(false, "reset_active_task_region_fields_in_cset(): " |
|
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|
3816 "don't call this any more"); |
|
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|
3817 |
|
3378
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|
3818 assert(SafepointSynchronize::is_at_safepoint(), "should be in STW"); |
|
69293e516993
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|
3819 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
69293e516993
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|
3820 |
|
69293e516993
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|
3821 for (int i = 0; i < (int)parallel_marking_threads(); i += 1) { |
|
69293e516993
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|
3822 CMTask* task = _tasks[i]; |
|
69293e516993
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|
3823 HeapWord* task_finger = task->finger(); |
|
69293e516993
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|
3824 if (task_finger != NULL) { |
|
69293e516993
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|
3825 assert(_g1h->is_in_g1_reserved(task_finger), "not in heap"); |
|
69293e516993
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|
3826 HeapRegion* finger_region = _g1h->heap_region_containing(task_finger); |
|
69293e516993
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|
3827 if (finger_region->in_collection_set()) { |
|
69293e516993
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|
3828 // The task's current region is in the collection set. |
|
69293e516993
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|
3829 // This region will be evacuated in the current GC and |
|
69293e516993
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|
3830 // the region fields in the task will be stale. |
|
69293e516993
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|
3831 task->giveup_current_region(); |
|
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|
3832 } |
|
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|
3833 } |
|
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|
3834 } |
|
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|
3835 } |
|
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|
3836 |
| 342 | 3837 // abandon current marking iteration due to a Full GC |
| 3838 void ConcurrentMark::abort() { | |
| 3839 // Clear all marks to force marking thread to do nothing | |
| 3840 _nextMarkBitMap->clearAll(); | |
|
4836
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|
3841 // Clear the liveness counting data |
|
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|
3842 clear_all_count_data(); |
| 342 | 3843 // Empty mark stack |
| 3844 clear_marking_state(); | |
|
1835
4805b9f4779e
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|
3845 for (int i = 0; i < (int)_max_task_num; ++i) { |
| 342 | 3846 _tasks[i]->clear_region_fields(); |
|
1835
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|
3847 } |
| 342 | 3848 _has_aborted = true; |
| 3849 | |
| 3850 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3851 satb_mq_set.abandon_partial_marking(); | |
|
1317
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|
3852 // This can be called either during or outside marking, we'll read |
|
d4197f8d516a
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|
3853 // the expected_active value from the SATB queue set. |
|
d4197f8d516a
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|
3854 satb_mq_set.set_active_all_threads( |
|
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|
3855 false, /* new active value */ |
|
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|
3856 satb_mq_set.is_active() /* expected_active */); |
| 342 | 3857 } |
| 3858 | |
| 3859 static void print_ms_time_info(const char* prefix, const char* name, | |
| 3860 NumberSeq& ns) { | |
| 3861 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3862 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3863 if (ns.num() > 0) { | |
| 3864 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3865 prefix, ns.sd(), ns.maximum()); | |
| 3866 } | |
| 3867 } | |
| 3868 | |
| 3869 void ConcurrentMark::print_summary_info() { | |
| 3870 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3871 print_ms_time_info(" ", "init marks", _init_times); | |
| 3872 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3873 { | |
| 3874 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3875 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3876 | |
| 3877 } | |
| 3878 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3879 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3880 _total_counting_time, | |
| 3881 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3882 (double)_cleanup_times.num() | |
| 3883 : 0.0)); | |
| 3884 if (G1ScrubRemSets) { | |
| 3885 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3886 _total_rs_scrub_time, | |
| 3887 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3888 (double)_cleanup_times.num() | |
| 3889 : 0.0)); | |
| 3890 } | |
| 3891 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3892 (_init_times.sum() + _remark_times.sum() + | |
| 3893 _cleanup_times.sum())/1000.0); | |
| 3894 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
|
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|
3895 "(%8.2f s marking).", |
| 342 | 3896 cmThread()->vtime_accum(), |
|
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|
3897 cmThread()->vtime_mark_accum()); |
| 342 | 3898 } |
| 3899 | |
| 1019 | 3900 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
| 3901 _parallel_workers->print_worker_threads_on(st); | |
| 3902 } | |
| 3903 | |
| 342 | 3904 // We take a break if someone is trying to stop the world. |
|
4728
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|
3905 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 342 | 3906 if (should_yield()) { |
|
4728
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|
3907 if (worker_id == 0) { |
| 342 | 3908 _g1h->g1_policy()->record_concurrent_pause(); |
|
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|
3909 } |
| 342 | 3910 cmThread()->yield(); |
|
4728
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|
3911 if (worker_id == 0) { |
| 342 | 3912 _g1h->g1_policy()->record_concurrent_pause_end(); |
|
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|
3913 } |
| 342 | 3914 return true; |
| 3915 } else { | |
| 3916 return false; | |
| 3917 } | |
| 3918 } | |
| 3919 | |
| 3920 bool ConcurrentMark::should_yield() { | |
| 3921 return cmThread()->should_yield(); | |
| 3922 } | |
| 3923 | |
| 3924 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 3925 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 3926 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 3927 } | |
| 3928 | |
| 3929 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 3930 void* last) { | |
|
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|
3931 return containing_card_is_marked(start) && |
|
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|
3932 containing_card_is_marked(last); |
| 342 | 3933 } |
| 3934 | |
| 3935 #ifndef PRODUCT | |
| 3936 // for debugging purposes | |
| 3937 void ConcurrentMark::print_finger() { | |
| 3938 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
| 3939 _heap_start, _heap_end, _finger); | |
| 3940 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 3941 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
| 3942 } | |
| 3943 gclog_or_tty->print_cr(""); | |
| 3944 } | |
| 3945 #endif | |
| 3946 | |
| 3771 | 3947 void CMTask::scan_object(oop obj) { |
| 3948 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3949 | |
| 3950 if (_cm->verbose_high()) { | |
| 3951 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
| 3952 _task_id, (void*) obj); | |
| 3953 } | |
| 3954 | |
| 3955 size_t obj_size = obj->size(); | |
| 3956 _words_scanned += obj_size; | |
| 3957 | |
| 3958 obj->oop_iterate(_cm_oop_closure); | |
| 3959 statsOnly( ++_objs_scanned ); | |
| 3960 check_limits(); | |
| 3961 } | |
| 3962 | |
| 342 | 3963 // Closure for iteration over bitmaps |
| 3964 class CMBitMapClosure : public BitMapClosure { | |
| 3965 private: | |
| 3966 // the bitmap that is being iterated over | |
| 3967 CMBitMap* _nextMarkBitMap; | |
| 3968 ConcurrentMark* _cm; | |
| 3969 CMTask* _task; | |
| 3970 // true if we're scanning a heap region claimed by the task (so that | |
| 3971 // we move the finger along), false if we're not, i.e. currently when | |
| 3972 // scanning a heap region popped from the region stack (so that we | |
| 3973 // do not move the task finger along; it'd be a mistake if we did so). | |
| 3974 bool _scanning_heap_region; | |
| 3975 | |
| 3976 public: | |
| 3977 CMBitMapClosure(CMTask *task, | |
| 3978 ConcurrentMark* cm, | |
| 3979 CMBitMap* nextMarkBitMap) | |
| 3980 : _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } | |
| 3981 | |
| 3982 void set_scanning_heap_region(bool scanning_heap_region) { | |
| 3983 _scanning_heap_region = scanning_heap_region; | |
| 3984 } | |
| 3985 | |
| 3986 bool do_bit(size_t offset) { | |
| 3987 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
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|
3988 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
|
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|
3989 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3990 |
| 3991 if (_scanning_heap_region) { | |
| 3992 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
|
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|
3993 assert(addr >= _task->finger(), "invariant"); |
| 342 | 3994 // We move that task's local finger along. |
| 3995 _task->move_finger_to(addr); | |
| 3996 } else { | |
| 3997 // We move the task's region finger along. | |
| 3998 _task->move_region_finger_to(addr); | |
| 3999 } | |
| 4000 | |
| 4001 _task->scan_object(oop(addr)); | |
| 4002 // we only partially drain the local queue and global stack | |
| 4003 _task->drain_local_queue(true); | |
| 4004 _task->drain_global_stack(true); | |
| 4005 | |
| 4006 // if the has_aborted flag has been raised, we need to bail out of | |
| 4007 // the iteration | |
| 4008 return !_task->has_aborted(); | |
| 4009 } | |
| 4010 }; | |
| 4011 | |
| 4012 // Closure for iterating over objects, currently only used for | |
| 4013 // processing SATB buffers. | |
| 4014 class CMObjectClosure : public ObjectClosure { | |
| 4015 private: | |
| 4016 CMTask* _task; | |
| 4017 | |
| 4018 public: | |
| 4019 void do_object(oop obj) { | |
| 4020 _task->deal_with_reference(obj); | |
| 4021 } | |
| 4022 | |
| 4023 CMObjectClosure(CMTask* task) : _task(task) { } | |
| 4024 }; | |
| 4025 | |
| 3771 | 4026 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 4027 ConcurrentMark* cm, | |
| 4028 CMTask* task) | |
| 4029 : _g1h(g1h), _cm(cm), _task(task) { | |
| 4030 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 4031 | |
| 4032 if (G1UseConcMarkReferenceProcessing) { | |
|
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4033 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 4034 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 4035 } |
| 3771 | 4036 } |
| 342 | 4037 |
| 4038 void CMTask::setup_for_region(HeapRegion* hr) { | |
|
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4039 // Separated the asserts so that we know which one fires. |
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4040 assert(hr != NULL, |
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4041 "claim_region() should have filtered out continues humongous regions"); |
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4042 assert(!hr->continuesHumongous(), |
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4043 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 4044 |
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4045 if (_cm->verbose_low()) { |
| 342 | 4046 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
| 4047 _task_id, hr); | |
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4048 } |
| 342 | 4049 |
| 4050 _curr_region = hr; | |
| 4051 _finger = hr->bottom(); | |
| 4052 update_region_limit(); | |
| 4053 } | |
| 4054 | |
| 4055 void CMTask::update_region_limit() { | |
| 4056 HeapRegion* hr = _curr_region; | |
| 4057 HeapWord* bottom = hr->bottom(); | |
| 4058 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 4059 | |
| 4060 if (limit == bottom) { | |
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4061 if (_cm->verbose_low()) { |
| 342 | 4062 gclog_or_tty->print_cr("[%d] found an empty region " |
| 4063 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 4064 _task_id, bottom, limit); | |
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4065 } |
| 342 | 4066 // The region was collected underneath our feet. |
| 4067 // We set the finger to bottom to ensure that the bitmap | |
| 4068 // iteration that will follow this will not do anything. | |
| 4069 // (this is not a condition that holds when we set the region up, | |
| 4070 // as the region is not supposed to be empty in the first place) | |
| 4071 _finger = bottom; | |
| 4072 } else if (limit >= _region_limit) { | |
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4073 assert(limit >= _finger, "peace of mind"); |
| 342 | 4074 } else { |
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4075 assert(limit < _region_limit, "only way to get here"); |
| 342 | 4076 // This can happen under some pretty unusual circumstances. An |
| 4077 // evacuation pause empties the region underneath our feet (NTAMS | |
| 4078 // at bottom). We then do some allocation in the region (NTAMS | |
| 4079 // stays at bottom), followed by the region being used as a GC | |
| 4080 // alloc region (NTAMS will move to top() and the objects | |
| 4081 // originally below it will be grayed). All objects now marked in | |
| 4082 // the region are explicitly grayed, if below the global finger, | |
| 4083 // and we do not need in fact to scan anything else. So, we simply | |
| 4084 // set _finger to be limit to ensure that the bitmap iteration | |
| 4085 // doesn't do anything. | |
| 4086 _finger = limit; | |
| 4087 } | |
| 4088 | |
| 4089 _region_limit = limit; | |
| 4090 } | |
| 4091 | |
| 4092 void CMTask::giveup_current_region() { | |
|
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4093 assert(_curr_region != NULL, "invariant"); |
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4094 if (_cm->verbose_low()) { |
| 342 | 4095 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
| 4096 _task_id, _curr_region); | |
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4097 } |
| 342 | 4098 clear_region_fields(); |
| 4099 } | |
| 4100 | |
| 4101 void CMTask::clear_region_fields() { | |
| 4102 // Values for these three fields that indicate that we're not | |
| 4103 // holding on to a region. | |
| 4104 _curr_region = NULL; | |
| 4105 _finger = NULL; | |
| 4106 _region_limit = NULL; | |
| 4107 | |
| 4108 _region_finger = NULL; | |
| 4109 } | |
| 4110 | |
| 3771 | 4111 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 4112 if (cm_oop_closure == NULL) { | |
| 4113 assert(_cm_oop_closure != NULL, "invariant"); | |
| 4114 } else { | |
| 4115 assert(_cm_oop_closure == NULL, "invariant"); | |
| 4116 } | |
| 4117 _cm_oop_closure = cm_oop_closure; | |
| 4118 } | |
| 4119 | |
| 342 | 4120 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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4121 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 4122 |
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4123 if (_cm->verbose_low()) { |
| 342 | 4124 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
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4125 } |
| 342 | 4126 |
| 4127 _nextMarkBitMap = nextMarkBitMap; | |
| 4128 clear_region_fields(); | |
|
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4129 assert(_aborted_region.is_empty(), "should have been cleared"); |
| 342 | 4130 |
| 4131 _calls = 0; | |
| 4132 _elapsed_time_ms = 0.0; | |
| 4133 _termination_time_ms = 0.0; | |
| 4134 _termination_start_time_ms = 0.0; | |
| 4135 | |
| 4136 #if _MARKING_STATS_ | |
| 4137 _local_pushes = 0; | |
| 4138 _local_pops = 0; | |
| 4139 _local_max_size = 0; | |
| 4140 _objs_scanned = 0; | |
| 4141 _global_pushes = 0; | |
| 4142 _global_pops = 0; | |
| 4143 _global_max_size = 0; | |
| 4144 _global_transfers_to = 0; | |
| 4145 _global_transfers_from = 0; | |
| 4146 _region_stack_pops = 0; | |
| 4147 _regions_claimed = 0; | |
| 4148 _objs_found_on_bitmap = 0; | |
| 4149 _satb_buffers_processed = 0; | |
| 4150 _steal_attempts = 0; | |
| 4151 _steals = 0; | |
| 4152 _aborted = 0; | |
| 4153 _aborted_overflow = 0; | |
| 4154 _aborted_cm_aborted = 0; | |
| 4155 _aborted_yield = 0; | |
| 4156 _aborted_timed_out = 0; | |
| 4157 _aborted_satb = 0; | |
| 4158 _aborted_termination = 0; | |
| 4159 #endif // _MARKING_STATS_ | |
| 4160 } | |
| 4161 | |
| 4162 bool CMTask::should_exit_termination() { | |
| 4163 regular_clock_call(); | |
| 4164 // This is called when we are in the termination protocol. We should | |
| 4165 // quit if, for some reason, this task wants to abort or the global | |
| 4166 // stack is not empty (this means that we can get work from it). | |
| 4167 return !_cm->mark_stack_empty() || has_aborted(); | |
| 4168 } | |
| 4169 | |
| 4170 void CMTask::reached_limit() { | |
|
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4171 assert(_words_scanned >= _words_scanned_limit || |
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4172 _refs_reached >= _refs_reached_limit , |
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4173 "shouldn't have been called otherwise"); |
| 342 | 4174 regular_clock_call(); |
| 4175 } | |
| 4176 | |
| 4177 void CMTask::regular_clock_call() { | |
|
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4178 if (has_aborted()) return; |
| 342 | 4179 |
| 4180 // First, we need to recalculate the words scanned and refs reached | |
| 4181 // limits for the next clock call. | |
| 4182 recalculate_limits(); | |
| 4183 | |
| 4184 // During the regular clock call we do the following | |
| 4185 | |
| 4186 // (1) If an overflow has been flagged, then we abort. | |
| 4187 if (_cm->has_overflown()) { | |
| 4188 set_has_aborted(); | |
| 4189 return; | |
| 4190 } | |
| 4191 | |
| 4192 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 4193 // to check anything else. The other steps are only needed during | |
| 4194 // the concurrent marking phase. | |
|
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4195 if (!concurrent()) return; |
| 342 | 4196 |
| 4197 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 4198 if (_cm->has_aborted()) { | |
| 4199 set_has_aborted(); | |
| 4200 statsOnly( ++_aborted_cm_aborted ); | |
| 4201 return; | |
| 4202 } | |
| 4203 | |
| 4204 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 4205 | |
| 4206 // (3) If marking stats are enabled, then we update the step history. | |
| 4207 #if _MARKING_STATS_ | |
|
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4208 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 4209 ++_clock_due_to_scanning; |
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4210 } |
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4211 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 4212 ++_clock_due_to_marking; |
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4213 } |
| 342 | 4214 |
| 4215 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 4216 _interval_start_time_ms = curr_time_ms; | |
| 4217 _all_clock_intervals_ms.add(last_interval_ms); | |
| 4218 | |
| 4219 if (_cm->verbose_medium()) { | |
|
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4220 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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4221 "scanned = %d%s, refs reached = %d%s", |
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4222 _task_id, last_interval_ms, |
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4223 _words_scanned, |
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4224 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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4225 _refs_reached, |
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4226 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 4227 } |
| 4228 #endif // _MARKING_STATS_ | |
| 4229 | |
| 4230 // (4) We check whether we should yield. If we have to, then we abort. | |
| 4231 if (_cm->should_yield()) { | |
| 4232 // We should yield. To do this we abort the task. The caller is | |
| 4233 // responsible for yielding. | |
| 4234 set_has_aborted(); | |
| 4235 statsOnly( ++_aborted_yield ); | |
| 4236 return; | |
| 4237 } | |
| 4238 | |
| 4239 // (5) We check whether we've reached our time quota. If we have, | |
| 4240 // then we abort. | |
| 4241 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 4242 if (elapsed_time_ms > _time_target_ms) { | |
| 4243 set_has_aborted(); | |
|
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|
4244 _has_timed_out = true; |
| 342 | 4245 statsOnly( ++_aborted_timed_out ); |
| 4246 return; | |
| 4247 } | |
| 4248 | |
| 4249 // (6) Finally, we check whether there are enough completed STAB | |
| 4250 // buffers available for processing. If there are, we abort. | |
| 4251 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 4252 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
|
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4253 if (_cm->verbose_low()) { |
| 342 | 4254 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
| 4255 _task_id); | |
|
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|
4256 } |
| 342 | 4257 // we do need to process SATB buffers, we'll abort and restart |
| 4258 // the marking task to do so | |
| 4259 set_has_aborted(); | |
| 4260 statsOnly( ++_aborted_satb ); | |
| 4261 return; | |
| 4262 } | |
| 4263 } | |
| 4264 | |
| 4265 void CMTask::recalculate_limits() { | |
| 4266 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 4267 _words_scanned_limit = _real_words_scanned_limit; | |
| 4268 | |
| 4269 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 4270 _refs_reached_limit = _real_refs_reached_limit; | |
| 4271 } | |
| 4272 | |
| 4273 void CMTask::decrease_limits() { | |
| 4274 // This is called when we believe that we're going to do an infrequent | |
| 4275 // operation which will increase the per byte scanned cost (i.e. move | |
| 4276 // entries to/from the global stack). It basically tries to decrease the | |
| 4277 // scanning limit so that the clock is called earlier. | |
| 4278 | |
|
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4279 if (_cm->verbose_medium()) { |
| 342 | 4280 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
|
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4281 } |
| 342 | 4282 |
| 4283 _words_scanned_limit = _real_words_scanned_limit - | |
| 4284 3 * words_scanned_period / 4; | |
| 4285 _refs_reached_limit = _real_refs_reached_limit - | |
| 4286 3 * refs_reached_period / 4; | |
| 4287 } | |
| 4288 | |
| 4289 void CMTask::move_entries_to_global_stack() { | |
| 4290 // local array where we'll store the entries that will be popped | |
| 4291 // from the local queue | |
| 4292 oop buffer[global_stack_transfer_size]; | |
| 4293 | |
| 4294 int n = 0; | |
| 4295 oop obj; | |
| 4296 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 4297 buffer[n] = obj; | |
| 4298 ++n; | |
| 4299 } | |
| 4300 | |
| 4301 if (n > 0) { | |
| 4302 // we popped at least one entry from the local queue | |
| 4303 | |
| 4304 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 4305 | |
| 4306 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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4307 if (_cm->verbose_low()) { |
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4308 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
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4309 _task_id); |
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|
4310 } |
| 342 | 4311 set_has_aborted(); |
| 4312 } else { | |
| 4313 // the transfer was successful | |
| 4314 | |
|
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4315 if (_cm->verbose_medium()) { |
| 342 | 4316 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
| 4317 _task_id, n); | |
|
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4318 } |
| 342 | 4319 statsOnly( int tmp_size = _cm->mark_stack_size(); |
|
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4320 if (tmp_size > _global_max_size) { |
| 342 | 4321 _global_max_size = tmp_size; |
|
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|
4322 } |
| 342 | 4323 _global_pushes += n ); |
| 4324 } | |
| 4325 } | |
| 4326 | |
| 4327 // this operation was quite expensive, so decrease the limits | |
| 4328 decrease_limits(); | |
| 4329 } | |
| 4330 | |
| 4331 void CMTask::get_entries_from_global_stack() { | |
| 4332 // local array where we'll store the entries that will be popped | |
| 4333 // from the global stack. | |
| 4334 oop buffer[global_stack_transfer_size]; | |
| 4335 int n; | |
| 4336 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
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4337 assert(n <= global_stack_transfer_size, |
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4338 "we should not pop more than the given limit"); |
| 342 | 4339 if (n > 0) { |
| 4340 // yes, we did actually pop at least one entry | |
| 4341 | |
| 4342 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
|
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4343 if (_cm->verbose_medium()) { |
| 342 | 4344 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
| 4345 _task_id, n); | |
|
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4346 } |
| 342 | 4347 for (int i = 0; i < n; ++i) { |
| 4348 bool success = _task_queue->push(buffer[i]); | |
| 4349 // We only call this when the local queue is empty or under a | |
| 4350 // given target limit. So, we do not expect this push to fail. | |
|
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4351 assert(success, "invariant"); |
| 342 | 4352 } |
| 4353 | |
| 4354 statsOnly( int tmp_size = _task_queue->size(); | |
|
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|
4355 if (tmp_size > _local_max_size) { |
| 342 | 4356 _local_max_size = tmp_size; |
|
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|
4357 } |
| 342 | 4358 _local_pushes += n ); |
| 4359 } | |
| 4360 | |
| 4361 // this operation was quite expensive, so decrease the limits | |
| 4362 decrease_limits(); | |
| 4363 } | |
| 4364 | |
| 4365 void CMTask::drain_local_queue(bool partially) { | |
|
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|
4366 if (has_aborted()) return; |
| 342 | 4367 |
| 4368 // Decide what the target size is, depending whether we're going to | |
| 4369 // drain it partially (so that other tasks can steal if they run out | |
| 4370 // of things to do) or totally (at the very end). | |
| 4371 size_t target_size; | |
|
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|
4372 if (partially) { |
| 342 | 4373 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
|
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|
4374 } else { |
| 342 | 4375 target_size = 0; |
|
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|
4376 } |
| 342 | 4377 |
| 4378 if (_task_queue->size() > target_size) { | |
|
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|
4379 if (_cm->verbose_high()) { |
| 342 | 4380 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
| 4381 _task_id, target_size); | |
|
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|
4382 } |
| 342 | 4383 |
| 4384 oop obj; | |
| 4385 bool ret = _task_queue->pop_local(obj); | |
| 4386 while (ret) { | |
| 4387 statsOnly( ++_local_pops ); | |
| 4388 | |
|
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|
4389 if (_cm->verbose_high()) { |
| 342 | 4390 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
| 4391 (void*) obj); | |
|
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|
4392 } |
| 342 | 4393 |
|
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|
4394 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 4395 assert(!_g1h->is_on_master_free_list( |
| 2152 | 4396 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 4397 |
| 4398 scan_object(obj); | |
| 4399 | |
|
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|
4400 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 4401 ret = false; |
|
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|
4402 } else { |
| 342 | 4403 ret = _task_queue->pop_local(obj); |
|
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|
4404 } |
| 342 | 4405 } |
| 4406 | |
|
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|
4407 if (_cm->verbose_high()) { |
| 342 | 4408 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
| 4409 _task_id, _task_queue->size()); | |
|
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|
4410 } |
| 342 | 4411 } |
| 4412 } | |
| 4413 | |
| 4414 void CMTask::drain_global_stack(bool partially) { | |
|
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|
4415 if (has_aborted()) return; |
| 342 | 4416 |
| 4417 // We have a policy to drain the local queue before we attempt to | |
| 4418 // drain the global stack. | |
|
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|
4419 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 4420 |
| 4421 // Decide what the target size is, depending whether we're going to | |
| 4422 // drain it partially (so that other tasks can steal if they run out | |
| 4423 // of things to do) or totally (at the very end). Notice that, | |
| 4424 // because we move entries from the global stack in chunks or | |
| 4425 // because another task might be doing the same, we might in fact | |
| 4426 // drop below the target. But, this is not a problem. | |
| 4427 size_t target_size; | |
|
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|
4428 if (partially) { |
| 342 | 4429 target_size = _cm->partial_mark_stack_size_target(); |
|
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|
4430 } else { |
| 342 | 4431 target_size = 0; |
|
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|
4432 } |
| 342 | 4433 |
| 4434 if (_cm->mark_stack_size() > target_size) { | |
|
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|
4435 if (_cm->verbose_low()) { |
| 342 | 4436 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
| 4437 _task_id, target_size); | |
|
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|
4438 } |
| 342 | 4439 |
| 4440 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 4441 get_entries_from_global_stack(); | |
| 4442 drain_local_queue(partially); | |
| 4443 } | |
| 4444 | |
|
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|
4445 if (_cm->verbose_low()) { |
| 342 | 4446 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
| 4447 _task_id, _cm->mark_stack_size()); | |
|
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|
4448 } |
| 342 | 4449 } |
| 4450 } | |
| 4451 | |
| 4452 // SATB Queue has several assumptions on whether to call the par or | |
| 4453 // non-par versions of the methods. this is why some of the code is | |
| 4454 // replicated. We should really get rid of the single-threaded version | |
| 4455 // of the code to simplify things. | |
| 4456 void CMTask::drain_satb_buffers() { | |
|
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|
4457 if (has_aborted()) return; |
| 342 | 4458 |
| 4459 // We set this so that the regular clock knows that we're in the | |
| 4460 // middle of draining buffers and doesn't set the abort flag when it | |
| 4461 // notices that SATB buffers are available for draining. It'd be | |
| 4462 // very counter productive if it did that. :-) | |
| 4463 _draining_satb_buffers = true; | |
| 4464 | |
| 4465 CMObjectClosure oc(this); | |
| 4466 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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|
4467 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4468 satb_mq_set.set_par_closure(_task_id, &oc); |
|
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|
4469 } else { |
| 342 | 4470 satb_mq_set.set_closure(&oc); |
|
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|
4471 } |
| 342 | 4472 |
| 4473 // This keeps claiming and applying the closure to completed buffers | |
| 4474 // until we run out of buffers or we need to abort. | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
4475 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4476 while (!has_aborted() && |
| 4477 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
|
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|
4478 if (_cm->verbose_medium()) { |
| 342 | 4479 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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changeset
|
4480 } |
| 342 | 4481 statsOnly( ++_satb_buffers_processed ); |
| 4482 regular_clock_call(); | |
| 4483 } | |
| 4484 } else { | |
| 4485 while (!has_aborted() && | |
| 4486 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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|
4487 if (_cm->verbose_medium()) { |
| 342 | 4488 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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changeset
|
4489 } |
| 342 | 4490 statsOnly( ++_satb_buffers_processed ); |
| 4491 regular_clock_call(); | |
| 4492 } | |
| 4493 } | |
| 4494 | |
| 4495 if (!concurrent() && !has_aborted()) { | |
| 4496 // We should only do this during remark. | |
|
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changeset
|
4497 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4498 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
|
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|
4499 } else { |
| 342 | 4500 satb_mq_set.iterate_closure_all_threads(); |
|
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|
4501 } |
| 342 | 4502 } |
| 4503 | |
| 4504 _draining_satb_buffers = false; | |
| 4505 | |
|
1023
11d4857fe5e1
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tonyp
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1022
diff
changeset
|
4506 assert(has_aborted() || |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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1022
diff
changeset
|
4507 concurrent() || |
|
11d4857fe5e1
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diff
changeset
|
4508 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 4509 |
|
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changeset
|
4510 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4511 satb_mq_set.set_par_closure(_task_id, NULL); |
|
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|
4512 } else { |
| 342 | 4513 satb_mq_set.set_closure(NULL); |
|
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|
4514 } |
| 342 | 4515 |
| 4516 // again, this was a potentially expensive operation, decrease the | |
| 4517 // limits to get the regular clock call early | |
| 4518 decrease_limits(); | |
| 4519 } | |
| 4520 | |
| 4521 void CMTask::drain_region_stack(BitMapClosure* bc) { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
4522 assert(_cm->region_stack_empty(), "region stack should be empty"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
4523 assert(_aborted_region.is_empty(), "aborted region should be empty"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
4524 return; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
4525 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
4526 if (has_aborted()) return; |
| 342 | 4527 |
|
1023
11d4857fe5e1
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tonyp
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1022
diff
changeset
|
4528 assert(_region_finger == NULL, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4529 "it should be NULL when we're not scanning a region"); |
| 342 | 4530 |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4531 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
|
3776
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changeset
|
4532 if (_cm->verbose_low()) { |
| 342 | 4533 gclog_or_tty->print_cr("[%d] draining region stack, size = %d", |
| 4534 _task_id, _cm->region_stack_size()); | |
|
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|
4535 } |
| 342 | 4536 |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4537 MemRegion mr; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4538 |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
4539 if (!_aborted_region.is_empty()) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4540 mr = _aborted_region; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4541 _aborted_region = MemRegion(); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
4542 |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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changeset
|
4543 if (_cm->verbose_low()) { |
|
23d434c6290d
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diff
changeset
|
4544 gclog_or_tty->print_cr("[%d] scanning aborted region " |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
4545 "[ " PTR_FORMAT ", " PTR_FORMAT " )", |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
4546 _task_id, mr.start(), mr.end()); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
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changeset
|
4547 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4548 } else { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4549 mr = _cm->region_stack_pop_lock_free(); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4550 // it returns MemRegion() if the pop fails |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
4551 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
|
4805b9f4779e
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1833
diff
changeset
|
4552 } |
| 342 | 4553 |
| 4554 while (mr.start() != NULL) { | |
|
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|
4555 if (_cm->verbose_medium()) { |
| 342 | 4556 gclog_or_tty->print_cr("[%d] we are scanning region " |
| 4557 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 4558 _task_id, mr.start(), mr.end()); | |
|
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|
4559 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
4560 |
|
1023
11d4857fe5e1
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1022
diff
changeset
|
4561 assert(mr.end() <= _cm->finger(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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1022
diff
changeset
|
4562 "otherwise the region shouldn't be on the stack"); |
| 342 | 4563 assert(!mr.is_empty(), "Only non-empty regions live on the region stack"); |
| 4564 if (_nextMarkBitMap->iterate(bc, mr)) { | |
|
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11d4857fe5e1
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diff
changeset
|
4565 assert(!has_aborted(), |
|
11d4857fe5e1
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diff
changeset
|
4566 "cannot abort the task without aborting the bitmap iteration"); |
| 342 | 4567 |
| 4568 // We finished iterating over the region without aborting. | |
| 4569 regular_clock_call(); | |
|
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changeset
|
4570 if (has_aborted()) { |
| 342 | 4571 mr = MemRegion(); |
|
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changeset
|
4572 } else { |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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parents:
1833
diff
changeset
|
4573 mr = _cm->region_stack_pop_lock_free(); |
| 342 | 4574 // it returns MemRegion() if the pop fails |
| 4575 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); | |
| 4576 } | |
| 4577 } else { | |
|
1023
11d4857fe5e1
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1022
diff
changeset
|
4578 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4579 |
| 4580 // The only way to abort the bitmap iteration is to return | |
| 4581 // false from the do_bit() method. However, inside the | |
| 4582 // do_bit() method we move the _region_finger to point to the | |
| 4583 // object currently being looked at. So, if we bail out, we | |
| 4584 // have definitely set _region_finger to something non-null. | |
|
1023
11d4857fe5e1
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diff
changeset
|
4585 assert(_region_finger != NULL, "invariant"); |
| 342 | 4586 |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4587 // Make sure that any previously aborted region has been |
|
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4588 // cleared. |
|
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4589 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
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4590 |
| 342 | 4591 // The iteration was actually aborted. So now _region_finger |
| 4592 // points to the address of the object we last scanned. If we | |
| 4593 // leave it there, when we restart this task, we will rescan | |
| 4594 // the object. It is easy to avoid this. We move the finger by | |
| 4595 // enough to point to the next possible object header (the | |
| 4596 // bitmap knows by how much we need to move it as it knows its | |
| 4597 // granularity). | |
| 4598 MemRegion newRegion = | |
| 4599 MemRegion(_nextMarkBitMap->nextWord(_region_finger), mr.end()); | |
| 4600 | |
| 4601 if (!newRegion.is_empty()) { | |
| 4602 if (_cm->verbose_low()) { | |
|
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4603 gclog_or_tty->print_cr("[%d] recording unscanned region" |
|
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4604 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
| 342 | 4605 _task_id, |
| 4606 newRegion.start(), newRegion.end()); | |
| 4607 } | |
|
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4608 // Now record the part of the region we didn't scan to |
|
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4609 // make sure this task scans it later. |
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4610 _aborted_region = newRegion; |
| 342 | 4611 } |
| 4612 // break from while | |
| 4613 mr = MemRegion(); | |
| 4614 } | |
| 4615 _region_finger = NULL; | |
| 4616 } | |
| 4617 | |
|
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4618 if (_cm->verbose_low()) { |
| 342 | 4619 gclog_or_tty->print_cr("[%d] drained region stack, size = %d", |
| 4620 _task_id, _cm->region_stack_size()); | |
|
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4621 } |
| 342 | 4622 } |
| 4623 } | |
| 4624 | |
| 4625 void CMTask::print_stats() { | |
| 4626 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
| 4627 _task_id, _calls); | |
| 4628 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
| 4629 _elapsed_time_ms, _termination_time_ms); | |
| 4630 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4631 _step_times_ms.num(), _step_times_ms.avg(), | |
| 4632 _step_times_ms.sd()); | |
| 4633 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4634 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 4635 | |
| 4636 #if _MARKING_STATS_ | |
| 4637 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4638 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 4639 _all_clock_intervals_ms.sd()); | |
| 4640 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4641 _all_clock_intervals_ms.maximum(), | |
| 4642 _all_clock_intervals_ms.sum()); | |
| 4643 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 4644 _clock_due_to_scanning, _clock_due_to_marking); | |
| 4645 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 4646 _objs_scanned, _objs_found_on_bitmap); | |
| 4647 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 4648 _local_pushes, _local_pops, _local_max_size); | |
| 4649 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 4650 _global_pushes, _global_pops, _global_max_size); | |
| 4651 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 4652 _global_transfers_to,_global_transfers_from); | |
| 4653 gclog_or_tty->print_cr(" Regions: claimed = %d, Region Stack: pops = %d", | |
| 4654 _regions_claimed, _region_stack_pops); | |
| 4655 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); | |
| 4656 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 4657 _steal_attempts, _steals); | |
| 4658 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 4659 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 4660 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 4661 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 4662 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 4663 #endif // _MARKING_STATS_ | |
| 4664 } | |
| 4665 | |
| 4666 /***************************************************************************** | |
| 4667 | |
| 4668 The do_marking_step(time_target_ms) method is the building block | |
| 4669 of the parallel marking framework. It can be called in parallel | |
| 4670 with other invocations of do_marking_step() on different tasks | |
| 4671 (but only one per task, obviously) and concurrently with the | |
| 4672 mutator threads, or during remark, hence it eliminates the need | |
| 4673 for two versions of the code. When called during remark, it will | |
| 4674 pick up from where the task left off during the concurrent marking | |
| 4675 phase. Interestingly, tasks are also claimable during evacuation | |
| 4676 pauses too, since do_marking_step() ensures that it aborts before | |
| 4677 it needs to yield. | |
| 4678 | |
| 4679 The data structures that is uses to do marking work are the | |
| 4680 following: | |
| 4681 | |
| 4682 (1) Marking Bitmap. If there are gray objects that appear only | |
| 4683 on the bitmap (this happens either when dealing with an overflow | |
| 4684 or when the initial marking phase has simply marked the roots | |
| 4685 and didn't push them on the stack), then tasks claim heap | |
| 4686 regions whose bitmap they then scan to find gray objects. A | |
| 4687 global finger indicates where the end of the last claimed region | |
| 4688 is. A local finger indicates how far into the region a task has | |
| 4689 scanned. The two fingers are used to determine how to gray an | |
| 4690 object (i.e. whether simply marking it is OK, as it will be | |
| 4691 visited by a task in the future, or whether it needs to be also | |
| 4692 pushed on a stack). | |
| 4693 | |
| 4694 (2) Local Queue. The local queue of the task which is accessed | |
| 4695 reasonably efficiently by the task. Other tasks can steal from | |
| 4696 it when they run out of work. Throughout the marking phase, a | |
| 4697 task attempts to keep its local queue short but not totally | |
| 4698 empty, so that entries are available for stealing by other | |
| 4699 tasks. Only when there is no more work, a task will totally | |
| 4700 drain its local queue. | |
| 4701 | |
| 4702 (3) Global Mark Stack. This handles local queue overflow. During | |
| 4703 marking only sets of entries are moved between it and the local | |
| 4704 queues, as access to it requires a mutex and more fine-grain | |
| 4705 interaction with it which might cause contention. If it | |
| 4706 overflows, then the marking phase should restart and iterate | |
| 4707 over the bitmap to identify gray objects. Throughout the marking | |
| 4708 phase, tasks attempt to keep the global mark stack at a small | |
| 4709 length but not totally empty, so that entries are available for | |
| 4710 popping by other tasks. Only when there is no more work, tasks | |
| 4711 will totally drain the global mark stack. | |
| 4712 | |
| 4713 (4) Global Region Stack. Entries on it correspond to areas of | |
| 4714 the bitmap that need to be scanned since they contain gray | |
| 4715 objects. Pushes on the region stack only happen during | |
| 4716 evacuation pauses and typically correspond to areas covered by | |
| 4717 GC LABS. If it overflows, then the marking phase should restart | |
| 4718 and iterate over the bitmap to identify gray objects. Tasks will | |
| 4719 try to totally drain the region stack as soon as possible. | |
| 4720 | |
| 4721 (5) SATB Buffer Queue. This is where completed SATB buffers are | |
| 4722 made available. Buffers are regularly removed from this queue | |
| 4723 and scanned for roots, so that the queue doesn't get too | |
| 4724 long. During remark, all completed buffers are processed, as | |
| 4725 well as the filled in parts of any uncompleted buffers. | |
| 4726 | |
| 4727 The do_marking_step() method tries to abort when the time target | |
| 4728 has been reached. There are a few other cases when the | |
| 4729 do_marking_step() method also aborts: | |
| 4730 | |
| 4731 (1) When the marking phase has been aborted (after a Full GC). | |
| 4732 | |
| 4733 (2) When a global overflow (either on the global stack or the | |
| 4734 region stack) has been triggered. Before the task aborts, it | |
| 4735 will actually sync up with the other tasks to ensure that all | |
| 4736 the marking data structures (local queues, stacks, fingers etc.) | |
| 4737 are re-initialised so that when do_marking_step() completes, | |
| 4738 the marking phase can immediately restart. | |
| 4739 | |
| 4740 (3) When enough completed SATB buffers are available. The | |
| 4741 do_marking_step() method only tries to drain SATB buffers right | |
| 4742 at the beginning. So, if enough buffers are available, the | |
| 4743 marking step aborts and the SATB buffers are processed at | |
| 4744 the beginning of the next invocation. | |
| 4745 | |
| 4746 (4) To yield. when we have to yield then we abort and yield | |
| 4747 right at the end of do_marking_step(). This saves us from a lot | |
| 4748 of hassle as, by yielding we might allow a Full GC. If this | |
| 4749 happens then objects will be compacted underneath our feet, the | |
| 4750 heap might shrink, etc. We save checking for this by just | |
| 4751 aborting and doing the yield right at the end. | |
| 4752 | |
| 4753 From the above it follows that the do_marking_step() method should | |
| 4754 be called in a loop (or, otherwise, regularly) until it completes. | |
| 4755 | |
| 4756 If a marking step completes without its has_aborted() flag being | |
| 4757 true, it means it has completed the current marking phase (and | |
| 4758 also all other marking tasks have done so and have all synced up). | |
| 4759 | |
| 4760 A method called regular_clock_call() is invoked "regularly" (in | |
| 4761 sub ms intervals) throughout marking. It is this clock method that | |
| 4762 checks all the abort conditions which were mentioned above and | |
| 4763 decides when the task should abort. A work-based scheme is used to | |
| 4764 trigger this clock method: when the number of object words the | |
| 4765 marking phase has scanned or the number of references the marking | |
| 4766 phase has visited reach a given limit. Additional invocations to | |
| 4767 the method clock have been planted in a few other strategic places | |
| 4768 too. The initial reason for the clock method was to avoid calling | |
| 4769 vtime too regularly, as it is quite expensive. So, once it was in | |
| 4770 place, it was natural to piggy-back all the other conditions on it | |
| 4771 too and not constantly check them throughout the code. | |
| 4772 | |
| 4773 *****************************************************************************/ | |
| 4774 | |
|
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4775 void CMTask::do_marking_step(double time_target_ms, |
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4776 bool do_stealing, |
|
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4777 bool do_termination) { |
|
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4778 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4779 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4780 |
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4781 assert(concurrent() || _cm->region_stack_empty(), |
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4782 "the region stack should have been cleared before remark"); |
|
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4783 assert(concurrent() || !_cm->has_aborted_regions(), |
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4784 "aborted regions should have been cleared before remark"); |
|
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4785 assert(_region_finger == NULL, |
|
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|
4786 "this should be non-null only when a region is being scanned"); |
| 342 | 4787 |
| 4788 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
|
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4789 assert(_task_queues != NULL, "invariant"); |
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4790 assert(_task_queue != NULL, "invariant"); |
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4791 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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4792 |
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|
4793 assert(!_claimed, |
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|
4794 "only one thread should claim this task at any one time"); |
| 342 | 4795 |
| 4796 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 4797 // possible for two threads to set the _claimed flag at the same | |
| 4798 // time. But it is only for debugging purposes anyway and it will | |
| 4799 // catch most problems. | |
| 4800 _claimed = true; | |
| 4801 | |
| 4802 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4803 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 4804 | |
| 4805 double diff_prediction_ms = | |
| 4806 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 4807 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 4808 | |
| 4809 // set up the variables that are used in the work-based scheme to | |
| 4810 // call the regular clock method | |
| 4811 _words_scanned = 0; | |
| 4812 _refs_reached = 0; | |
| 4813 recalculate_limits(); | |
| 4814 | |
| 4815 // clear all flags | |
| 4816 clear_has_aborted(); | |
|
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4817 _has_timed_out = false; |
| 342 | 4818 _draining_satb_buffers = false; |
| 4819 | |
| 4820 ++_calls; | |
| 4821 | |
|
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|
4822 if (_cm->verbose_low()) { |
| 342 | 4823 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
| 4824 "target = %1.2lfms >>>>>>>>>>", | |
| 4825 _task_id, _calls, _time_target_ms); | |
|
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|
4826 } |
| 342 | 4827 |
| 4828 // Set up the bitmap and oop closures. Anything that uses them is | |
| 4829 // eventually called from this method, so it is OK to allocate these | |
| 4830 // statically. | |
| 4831 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 4832 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 4833 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 4834 |
| 4835 if (_cm->has_overflown()) { | |
| 4836 // This can happen if the region stack or the mark stack overflows | |
| 4837 // during a GC pause and this task, after a yield point, | |
| 4838 // restarts. We have to abort as we need to get into the overflow | |
| 4839 // protocol which happens right at the end of this task. | |
| 4840 set_has_aborted(); | |
| 4841 } | |
| 4842 | |
| 4843 // First drain any available SATB buffers. After this, we will not | |
| 4844 // look at SATB buffers before the next invocation of this method. | |
| 4845 // If enough completed SATB buffers are queued up, the regular clock | |
| 4846 // will abort this task so that it restarts. | |
| 4847 drain_satb_buffers(); | |
| 4848 // ...then partially drain the local queue and the global stack | |
| 4849 drain_local_queue(true); | |
| 4850 drain_global_stack(true); | |
| 4851 | |
| 4852 // Then totally drain the region stack. We will not look at | |
| 4853 // it again before the next invocation of this method. Entries on | |
| 4854 // the region stack are only added during evacuation pauses, for | |
| 4855 // which we have to yield. When we do, we abort the task anyway so | |
| 4856 // it will look at the region stack again when it restarts. | |
| 4857 bitmap_closure.set_scanning_heap_region(false); | |
| 4858 drain_region_stack(&bitmap_closure); | |
| 4859 // ...then partially drain the local queue and the global stack | |
| 4860 drain_local_queue(true); | |
| 4861 drain_global_stack(true); | |
| 4862 | |
| 4863 do { | |
| 4864 if (!has_aborted() && _curr_region != NULL) { | |
| 4865 // This means that we're already holding on to a region. | |
|
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4866 assert(_finger != NULL, "if region is not NULL, then the finger " |
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|
4867 "should not be NULL either"); |
| 342 | 4868 |
| 4869 // We might have restarted this task after an evacuation pause | |
| 4870 // which might have evacuated the region we're holding on to | |
| 4871 // underneath our feet. Let's read its limit again to make sure | |
| 4872 // that we do not iterate over a region of the heap that | |
| 4873 // contains garbage (update_region_limit() will also move | |
| 4874 // _finger to the start of the region if it is found empty). | |
| 4875 update_region_limit(); | |
| 4876 // We will start from _finger not from the start of the region, | |
| 4877 // as we might be restarting this task after aborting half-way | |
| 4878 // through scanning this region. In this case, _finger points to | |
| 4879 // the address where we last found a marked object. If this is a | |
| 4880 // fresh region, _finger points to start(). | |
| 4881 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 4882 | |
|
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4883 if (_cm->verbose_low()) { |
| 342 | 4884 gclog_or_tty->print_cr("[%d] we're scanning part " |
| 4885 "["PTR_FORMAT", "PTR_FORMAT") " | |
| 4886 "of region "PTR_FORMAT, | |
| 4887 _task_id, _finger, _region_limit, _curr_region); | |
|
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|
4888 } |
| 342 | 4889 |
| 4890 // Let's iterate over the bitmap of the part of the | |
| 4891 // region that is left. | |
| 4892 bitmap_closure.set_scanning_heap_region(true); | |
| 4893 if (mr.is_empty() || | |
| 4894 _nextMarkBitMap->iterate(&bitmap_closure, mr)) { | |
| 4895 // We successfully completed iterating over the region. Now, | |
| 4896 // let's give up the region. | |
| 4897 giveup_current_region(); | |
| 4898 regular_clock_call(); | |
| 4899 } else { | |
|
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4900 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4901 // The only way to abort the bitmap iteration is to return |
| 4902 // false from the do_bit() method. However, inside the | |
| 4903 // do_bit() method we move the _finger to point to the | |
| 4904 // object currently being looked at. So, if we bail out, we | |
| 4905 // have definitely set _finger to something non-null. | |
|
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4906 assert(_finger != NULL, "invariant"); |
| 342 | 4907 |
| 4908 // Region iteration was actually aborted. So now _finger | |
| 4909 // points to the address of the object we last scanned. If we | |
| 4910 // leave it there, when we restart this task, we will rescan | |
| 4911 // the object. It is easy to avoid this. We move the finger by | |
| 4912 // enough to point to the next possible object header (the | |
| 4913 // bitmap knows by how much we need to move it as it knows its | |
| 4914 // granularity). | |
|
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4915 assert(_finger < _region_limit, "invariant"); |
|
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4916 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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1284
diff
changeset
|
4917 // Check if bitmap iteration was aborted while scanning the last object |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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1284
diff
changeset
|
4918 if (new_finger >= _region_limit) { |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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1284
diff
changeset
|
4919 giveup_current_region(); |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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1284
diff
changeset
|
4920 } else { |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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1284
diff
changeset
|
4921 move_finger_to(new_finger); |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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1284
diff
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|
4922 } |
| 342 | 4923 } |
| 4924 } | |
| 4925 // At this point we have either completed iterating over the | |
| 4926 // region we were holding on to, or we have aborted. | |
| 4927 | |
| 4928 // We then partially drain the local queue and the global stack. | |
| 4929 // (Do we really need this?) | |
| 4930 drain_local_queue(true); | |
| 4931 drain_global_stack(true); | |
| 4932 | |
| 4933 // Read the note on the claim_region() method on why it might | |
| 4934 // return NULL with potentially more regions available for | |
| 4935 // claiming and why we have to check out_of_regions() to determine | |
| 4936 // whether we're done or not. | |
| 4937 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 4938 // We are going to try to claim a new region. We should have | |
| 4939 // given up on the previous one. | |
|
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|
4940 // Separated the asserts so that we know which one fires. |
|
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|
4941 assert(_curr_region == NULL, "invariant"); |
|
11d4857fe5e1
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tonyp
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diff
changeset
|
4942 assert(_finger == NULL, "invariant"); |
|
11d4857fe5e1
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|
4943 assert(_region_limit == NULL, "invariant"); |
|
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|
4944 if (_cm->verbose_low()) { |
| 342 | 4945 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
|
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|
4946 } |
| 342 | 4947 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
| 4948 if (claimed_region != NULL) { | |
| 4949 // Yes, we managed to claim one | |
| 4950 statsOnly( ++_regions_claimed ); | |
| 4951 | |
|
3776
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|
4952 if (_cm->verbose_low()) { |
| 342 | 4953 gclog_or_tty->print_cr("[%d] we successfully claimed " |
| 4954 "region "PTR_FORMAT, | |
| 4955 _task_id, claimed_region); | |
|
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|
4956 } |
| 342 | 4957 |
| 4958 setup_for_region(claimed_region); | |
|
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|
4959 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 4960 } |
| 4961 // It is important to call the regular clock here. It might take | |
| 4962 // a while to claim a region if, for example, we hit a large | |
| 4963 // block of empty regions. So we need to call the regular clock | |
| 4964 // method once round the loop to make sure it's called | |
| 4965 // frequently enough. | |
| 4966 regular_clock_call(); | |
| 4967 } | |
| 4968 | |
| 4969 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
4970 assert(_cm->out_of_regions(), |
|
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|
4971 "at this point we should be out of regions"); |
| 342 | 4972 } |
| 4973 } while ( _curr_region != NULL && !has_aborted()); | |
| 4974 | |
| 4975 if (!has_aborted()) { | |
| 4976 // 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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parents:
342
diff
changeset
|
4977 // 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, ...)
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parents:
342
diff
changeset
|
4978 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
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|
4979 // it can push a partially done region back. |
|
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|
4980 assert(_cm->out_of_regions(), |
|
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|
4981 "at this point we should be out of regions"); |
| 342 | 4982 |
|
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|
4983 if (_cm->verbose_low()) { |
| 342 | 4984 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
|
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|
4985 } |
| 342 | 4986 |
| 4987 // Try to reduce the number of available SATB buffers so that | |
| 4988 // remark has less work to do. | |
| 4989 drain_satb_buffers(); | |
| 4990 } | |
| 4991 | |
| 4992 // Since we've done everything else, we can now totally drain the | |
| 4993 // local queue and global stack. | |
| 4994 drain_local_queue(false); | |
| 4995 drain_global_stack(false); | |
| 4996 | |
| 4997 // Attempt at work stealing from other task's queues. | |
|
2174
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|
4998 if (do_stealing && !has_aborted()) { |
| 342 | 4999 // We have not aborted. This means that we have finished all that |
| 5000 // we could. Let's try to do some stealing... | |
| 5001 | |
| 5002 // 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
parents:
342
diff
changeset
|
5003 // 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
|
5004 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
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342
diff
changeset
|
5005 // it can push a partially done region back. |
|
1023
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|
5006 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
11d4857fe5e1
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|
5007 "only way to reach here"); |
| 342 | 5008 |
|
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|
5009 if (_cm->verbose_low()) { |
| 342 | 5010 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
|
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|
5011 } |
| 342 | 5012 |
| 5013 while (!has_aborted()) { | |
| 5014 oop obj; | |
| 5015 statsOnly( ++_steal_attempts ); | |
| 5016 | |
| 5017 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
|
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|
5018 if (_cm->verbose_medium()) { |
| 342 | 5019 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
| 5020 _task_id, (void*) obj); | |
|
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|
5021 } |
| 342 | 5022 |
| 5023 statsOnly( ++_steals ); | |
| 5024 | |
|
1023
11d4857fe5e1
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|
5025 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
11d4857fe5e1
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tonyp
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1022
diff
changeset
|
5026 "any stolen object should be marked"); |
| 342 | 5027 scan_object(obj); |
| 5028 | |
| 5029 // And since we're towards the end, let's totally drain the | |
| 5030 // local queue and global stack. | |
| 5031 drain_local_queue(false); | |
| 5032 drain_global_stack(false); | |
| 5033 } else { | |
| 5034 break; | |
| 5035 } | |
| 5036 } | |
| 5037 } | |
| 5038 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
5039 // 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
|
5040 // 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
|
5041 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
|
5042 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
|
5043 _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
|
5044 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
|
5045 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
5046 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
5047 |
| 342 | 5048 // We still haven't aborted. Now, let's try to get into the |
| 5049 // termination protocol. | |
|
2174
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2152
diff
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|
5050 if (do_termination && !has_aborted()) { |
| 342 | 5051 // 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
parents:
342
diff
changeset
|
5052 // 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, ...)
iveresov
parents:
342
diff
changeset
|
5053 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
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342
diff
changeset
|
5054 // it can push a partially done region back. |
|
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|
5055 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
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diff
changeset
|
5056 assert(_cm->out_of_regions(), "only way to reach here"); |
|
11d4857fe5e1
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diff
changeset
|
5057 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 5058 |
|
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|
5059 if (_cm->verbose_low()) { |
| 342 | 5060 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
|
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|
5061 } |
| 342 | 5062 |
| 5063 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
| 5064 // The CMTask class also extends the TerminatorTerminator class, | |
| 5065 // hence its should_exit_termination() method will also decide | |
| 5066 // whether to exit the termination protocol or not. | |
| 5067 bool finished = _cm->terminator()->offer_termination(this); | |
| 5068 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
| 5069 _termination_time_ms += | |
| 5070 termination_end_time_ms - _termination_start_time_ms; | |
| 5071 | |
| 5072 if (finished) { | |
| 5073 // We're all done. | |
| 5074 | |
| 5075 if (_task_id == 0) { | |
| 5076 // let's allow task 0 to do this | |
| 5077 if (concurrent()) { | |
|
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|
5078 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 5079 // we need to set this to false before the next |
| 5080 // safepoint. This way we ensure that the marking phase | |
| 5081 // doesn't observe any more heap expansions. | |
| 5082 _cm->clear_concurrent_marking_in_progress(); | |
| 5083 } | |
| 5084 } | |
| 5085 | |
| 5086 // We can now guarantee that the global stack is empty, since | |
|
1023
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1022
diff
changeset
|
5087 // all other tasks have finished. We separated the guarantees so |
|
11d4857fe5e1
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diff
changeset
|
5088 // that, if a condition is false, we can immediately find out |
|
11d4857fe5e1
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diff
changeset
|
5089 // which one. |
|
11d4857fe5e1
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1022
diff
changeset
|
5090 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
|
5091 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
|
1023
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changeset
|
5092 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
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1022
diff
changeset
|
5093 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
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parents:
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diff
changeset
|
5094 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
11d4857fe5e1
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diff
changeset
|
5095 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
11d4857fe5e1
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diff
changeset
|
5096 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
|
11d4857fe5e1
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diff
changeset
|
5097 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
| 342 | 5098 |
|
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|
5099 if (_cm->verbose_low()) { |
| 342 | 5100 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
|
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|
5101 } |
| 342 | 5102 } else { |
| 5103 // Apparently there's more work to do. Let's abort this task. It | |
| 5104 // will restart it and we can hopefully find more things to do. | |
| 5105 | |
|
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|
5106 if (_cm->verbose_low()) { |
|
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changeset
|
5107 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
|
23d434c6290d
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|
5108 _task_id); |
|
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|
5109 } |
| 342 | 5110 |
| 5111 set_has_aborted(); | |
| 5112 statsOnly( ++_aborted_termination ); | |
| 5113 } | |
| 5114 } | |
| 5115 | |
| 5116 // Mainly for debugging purposes to make sure that a pointer to the | |
| 5117 // closure which was statically allocated in this frame doesn't | |
| 5118 // escape it by accident. | |
| 3771 | 5119 set_cm_oop_closure(NULL); |
| 342 | 5120 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 5121 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 5122 // Update the step history. | |
| 5123 _step_times_ms.add(elapsed_time_ms); | |
| 5124 | |
| 5125 if (has_aborted()) { | |
| 5126 // The task was aborted for some reason. | |
| 5127 | |
| 5128 statsOnly( ++_aborted ); | |
| 5129 | |
|
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|
5130 if (_has_timed_out) { |
| 342 | 5131 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 5132 // Keep statistics of how well we did with respect to hitting | |
| 5133 // our target only if we actually timed out (if we aborted for | |
| 5134 // other reasons, then the results might get skewed). | |
| 5135 _marking_step_diffs_ms.add(diff_ms); | |
| 5136 } | |
| 5137 | |
| 5138 if (_cm->has_overflown()) { | |
| 5139 // This is the interesting one. We aborted because a global | |
| 5140 // overflow was raised. This means we have to restart the | |
| 5141 // marking phase and start iterating over regions. However, in | |
| 5142 // order to do this we have to make sure that all tasks stop | |
| 5143 // what they are doing and re-initialise in a safe manner. We | |
| 5144 // will achieve this with the use of two barrier sync points. | |
| 5145 | |
|
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|
5146 if (_cm->verbose_low()) { |
| 342 | 5147 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
|
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|
5148 } |
| 342 | 5149 |
| 5150 _cm->enter_first_sync_barrier(_task_id); | |
| 5151 // When we exit this sync barrier we know that all tasks have | |
| 5152 // stopped doing marking work. So, it's now safe to | |
| 5153 // re-initialise our data structures. At the end of this method, | |
| 5154 // task 0 will clear the global data structures. | |
| 5155 | |
| 5156 statsOnly( ++_aborted_overflow ); | |
| 5157 | |
| 5158 // We clear the local state of this task... | |
| 5159 clear_region_fields(); | |
| 5160 | |
| 5161 // ...and enter the second barrier. | |
| 5162 _cm->enter_second_sync_barrier(_task_id); | |
| 5163 // At this point everything has bee re-initialised and we're | |
| 5164 // ready to restart. | |
| 5165 } | |
| 5166 | |
| 5167 if (_cm->verbose_low()) { | |
| 5168 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
| 5169 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 5170 _task_id, _time_target_ms, elapsed_time_ms); | |
|
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|
5171 if (_cm->has_aborted()) { |
| 342 | 5172 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
| 5173 _task_id); | |
|
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|
5174 } |
| 342 | 5175 } |
| 5176 } else { | |
|
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|
5177 if (_cm->verbose_low()) { |
| 342 | 5178 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 5179 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 5180 _task_id, _time_target_ms, elapsed_time_ms); | |
|
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|
5181 } |
| 342 | 5182 } |
| 5183 | |
| 5184 _claimed = false; | |
| 5185 } | |
| 5186 | |
| 5187 CMTask::CMTask(int task_id, | |
| 5188 ConcurrentMark* cm, | |
|
4836
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|
5189 size_t* marked_bytes, |
|
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|
5190 BitMap* card_bm, |
| 342 | 5191 CMTaskQueue* task_queue, |
| 5192 CMTaskQueueSet* task_queues) | |
| 5193 : _g1h(G1CollectedHeap::heap()), | |
| 5194 _task_id(task_id), _cm(cm), | |
| 5195 _claimed(false), | |
| 5196 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 5197 _task_queue(task_queue), | |
| 5198 _task_queues(task_queues), | |
| 3771 | 5199 _cm_oop_closure(NULL), |
|
4836
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|
5200 _aborted_region(MemRegion()), |
|
d30fa85f9994
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|
5201 _marked_bytes_array(marked_bytes), |
|
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|
5202 _card_bm(card_bm) { |
|
1023
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6888619: G1: too many guarantees in concurrent marking
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|
5203 guarantee(task_queue != NULL, "invariant"); |
|
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|
5204 guarantee(task_queues != NULL, "invariant"); |
| 342 | 5205 |
| 5206 statsOnly( _clock_due_to_scanning = 0; | |
| 5207 _clock_due_to_marking = 0 ); | |
| 5208 | |
| 5209 _marking_step_diffs_ms.add(0.5); | |
| 5210 } | |
|
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|
5211 |
|
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|
5212 // These are formatting macros that are used below to ensure |
|
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|
5213 // consistent formatting. The *_H_* versions are used to format the |
|
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|
5214 // header for a particular value and they should be kept consistent |
|
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|
5215 // with the corresponding macro. Also note that most of the macros add |
|
371bbc844bf1
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|
5216 // the necessary white space (as a prefix) which makes them a bit |
|
371bbc844bf1
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|
5217 // easier to compose. |
|
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|
5218 |
|
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|
5219 // All the output lines are prefixed with this string to be able to |
|
371bbc844bf1
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|
5220 // identify them easily in a large log file. |
|
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|
5221 #define G1PPRL_LINE_PREFIX "###" |
|
371bbc844bf1
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|
5222 |
|
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|
5223 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
|
371bbc844bf1
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|
5224 #ifdef _LP64 |
|
371bbc844bf1
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|
5225 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
|
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|
5226 #else // _LP64 |
|
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|
5227 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5228 #endif // _LP64 |
|
371bbc844bf1
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|
5229 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5230 // For per-region info |
|
371bbc844bf1
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|
5231 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
371bbc844bf1
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|
5232 #define G1PPRL_TYPE_H_FORMAT " %4s" |
|
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|
5233 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
|
371bbc844bf1
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|
5234 #define G1PPRL_BYTE_H_FORMAT " %9s" |
|
371bbc844bf1
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|
5235 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
|
371bbc844bf1
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|
5236 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
371bbc844bf1
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|
5237 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5238 // For summary info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5239 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
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|
5240 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
|
371bbc844bf1
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|
5241 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
|
371bbc844bf1
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|
5242 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5243 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5244 G1PrintRegionLivenessInfoClosure:: |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5245 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5246 : _out(out), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5247 _total_used_bytes(0), _total_capacity_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5248 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5249 _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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|
5250 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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|
5251 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5252 MemRegion g1_committed = g1h->g1_committed(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5253 MemRegion g1_reserved = g1h->g1_reserved(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5254 double now = os::elapsedTime(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
5255 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5256 // Print the header of the output. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
5257 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
5258 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5259 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5260 G1PPRL_SUM_ADDR_FORMAT("committed") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
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changeset
|
5261 G1PPRL_SUM_ADDR_FORMAT("reserved") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
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changeset
|
5262 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
5263 g1_committed.start(), g1_committed.end(), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
5264 g1_reserved.start(), g1_reserved.end(), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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3979
diff
changeset
|
5265 HeapRegion::GrainBytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5266 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
5267 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5268 G1PPRL_TYPE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5269 G1PPRL_ADDR_BASE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5270 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5271 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5272 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5273 G1PPRL_DOUBLE_H_FORMAT, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5274 "type", "address-range", |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5275 "used", "prev-live", "next-live", "gc-eff"); |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
diff
changeset
|
5276 _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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|
5277 G1PPRL_TYPE_H_FORMAT |
|
5cc33133bc6d
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|
5278 G1PPRL_ADDR_BASE_H_FORMAT |
|
5cc33133bc6d
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|
5279 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
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changeset
|
5280 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
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|
5281 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
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|
5282 G1PPRL_DOUBLE_H_FORMAT, |
|
5cc33133bc6d
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3975
diff
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|
5283 "", "", |
|
5cc33133bc6d
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3975
diff
changeset
|
5284 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
|
2435
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|
5285 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5286 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5287 // 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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changeset
|
5288 // 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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changeset
|
5289 // series (either the region size, or what's left if the _hum_* field |
|
371bbc844bf1
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|
5290 // 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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|
5291 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
371bbc844bf1
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changeset
|
5292 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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changeset
|
5293 // 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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|
5294 // could be 0. |
|
371bbc844bf1
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diff
changeset
|
5295 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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3979
diff
changeset
|
5296 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
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|
5297 *hum_bytes -= bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5298 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5299 return bytes; |
|
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
|
5300 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5301 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
5302 // 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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2369
diff
changeset
|
5303 // 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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2369
diff
changeset
|
5304 // 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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2369
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|
5305 // 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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changeset
|
5306 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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changeset
|
5307 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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2369
diff
changeset
|
5308 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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diff
changeset
|
5309 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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2369
diff
changeset
|
5310 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
changeset
|
5311 *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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changeset
|
5312 *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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|
5313 *prev_live_bytes = get_hum_bytes(&_hum_prev_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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changeset
|
5314 *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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changeset
|
5315 } |
|
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2369
diff
changeset
|
5316 |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5317 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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|
5318 const char* type = ""; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5319 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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|
5320 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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|
5321 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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changeset
|
5322 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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changeset
|
5323 size_t prev_live_bytes = r->live_bytes(); |
|
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changeset
|
5324 size_t next_live_bytes = r->next_live_bytes(); |
|
371bbc844bf1
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changeset
|
5325 double gc_eff = r->gc_efficiency(); |
|
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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
|
5326 if (r->used() == 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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diff
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|
5327 type = "FREE"; |
|
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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|
5328 } 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
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|
5329 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5330 } 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
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|
5331 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
|
5332 } 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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parents:
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diff
changeset
|
5333 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
|
5334 |
|
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diff
changeset
|
5335 assert(_hum_used_bytes == 0 && _hum_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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|
5336 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5337 "they should have been zeroed after the last time we used them"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
5338 // Set up the _hum_* fields. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
5339 _hum_capacity_bytes = 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
|
5340 _hum_used_bytes = used_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
|
5341 _hum_prev_live_bytes = prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5342 _hum_next_live_bytes = 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
|
5343 get_hum_bytes(&used_bytes, &capacity_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
|
5344 &prev_live_bytes, &next_live_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
|
5345 end = bottom + HeapRegion::GrainWords; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
5346 } else if (r->continuesHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5347 type = "HUMC"; |
|
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
|
5348 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5349 &prev_live_bytes, &next_live_bytes); |
|
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
|
5350 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
|
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
|
5351 } else { |
|
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
|
5352 type = "OLD"; |
|
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
|
5353 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5354 |
|
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
|
5355 _total_used_bytes += used_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
|
5356 _total_capacity_bytes += capacity_bytes; |
|
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
|
5357 _total_prev_live_bytes += prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5358 _total_next_live_bytes += next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5359 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5360 // Print a line for this particular region. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5361 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5362 G1PPRL_TYPE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5363 G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5364 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5365 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5366 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5367 G1PPRL_DOUBLE_FORMAT, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5368 type, bottom, end, |
|
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
|
5369 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5370 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5371 return false; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5372 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5373 |
|
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
|
5374 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
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
|
5375 // Print the footer of the output. |
|
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
|
5376 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5377 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5378 " SUMMARY" |
|
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
|
5379 G1PPRL_SUM_MB_FORMAT("capacity") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5380 G1PPRL_SUM_MB_PERC_FORMAT("used") |
|
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
|
5381 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
5382 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5383 bytes_to_mb(_total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5384 bytes_to_mb(_total_used_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5385 perc(_total_used_bytes, _total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5386 bytes_to_mb(_total_prev_live_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5387 perc(_total_prev_live_bytes, _total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5388 bytes_to_mb(_total_next_live_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5389 perc(_total_next_live_bytes, _total_capacity_bytes)); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5390 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5391 } |