Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 4827:2e966d967c5c
7121547: G1: High number mispredicted branches while iterating over the marking bitmap
Summary: There is a high number of mispredicted branches associated with calling BitMap::iteratate() from within CMBitMapRO::iterate(). Implement a version of CMBitMapRO::iterate() directly using inline-able routines.
Reviewed-by: tonyp, iveresov
| author | johnc |
|---|---|
| date | Fri, 13 Jan 2012 13:27:48 -0800 |
| parents | 2ace1c4ee8da |
| children | 851b58c26def |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/symbolTable.hpp" | |
| 3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
| 1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
| 29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
| 3771 | 32 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
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34 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 35 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 36 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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37 #include "gc_implementation/shared/vmGCOperations.hpp" |
| 1972 | 38 #include "memory/genOopClosures.inline.hpp" |
| 39 #include "memory/referencePolicy.hpp" | |
| 40 #include "memory/resourceArea.hpp" | |
| 41 #include "oops/oop.inline.hpp" | |
| 42 #include "runtime/handles.inline.hpp" | |
| 43 #include "runtime/java.hpp" | |
| 342 | 44 |
| 45 // | |
| 46 // CMS Bit Map Wrapper | |
| 47 | |
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48 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
| 342 | 49 _bm((uintptr_t*)NULL,0), |
| 50 _shifter(shifter) { | |
| 51 _bmStartWord = (HeapWord*)(rs.base()); | |
| 52 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
| 53 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
| 54 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
| 55 | |
| 56 guarantee(brs.is_reserved(), "couldn't allocate CMS bit map"); | |
| 57 // For now we'll just commit all of the bit map up fromt. | |
| 58 // Later on we'll try to be more parsimonious with swap. | |
| 59 guarantee(_virtual_space.initialize(brs, brs.size()), | |
| 60 "couldn't reseve backing store for CMS bit map"); | |
| 61 assert(_virtual_space.committed_size() == brs.size(), | |
| 62 "didn't reserve backing store for all of CMS bit map?"); | |
| 63 _bm.set_map((uintptr_t*)_virtual_space.low()); | |
| 64 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
| 65 _bmWordSize, "inconsistency in bit map sizing"); | |
| 66 _bm.set_size(_bmWordSize >> _shifter); | |
| 67 } | |
| 68 | |
| 69 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
| 70 HeapWord* limit) const { | |
| 71 // First we must round addr *up* to a possible object boundary. | |
| 72 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
| 73 HeapWordSize << _shifter); | |
| 74 size_t addrOffset = heapWordToOffset(addr); | |
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75 if (limit == NULL) { |
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76 limit = _bmStartWord + _bmWordSize; |
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77 } |
| 342 | 78 size_t limitOffset = heapWordToOffset(limit); |
| 79 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
| 80 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 81 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 82 assert(nextAddr == limit || isMarked(nextAddr), | |
| 83 "get_next_one postcondition"); | |
| 84 return nextAddr; | |
| 85 } | |
| 86 | |
| 87 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
| 88 HeapWord* limit) const { | |
| 89 size_t addrOffset = heapWordToOffset(addr); | |
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90 if (limit == NULL) { |
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91 limit = _bmStartWord + _bmWordSize; |
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92 } |
| 342 | 93 size_t limitOffset = heapWordToOffset(limit); |
| 94 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
| 95 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 96 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 97 assert(nextAddr == limit || !isMarked(nextAddr), | |
| 98 "get_next_one postcondition"); | |
| 99 return nextAddr; | |
| 100 } | |
| 101 | |
| 102 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
| 103 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
| 104 return (int) (diff >> _shifter); | |
| 105 } | |
| 106 | |
| 107 void CMBitMapRO::mostly_disjoint_range_union(BitMap* from_bitmap, | |
| 108 size_t from_start_index, | |
| 109 HeapWord* to_start_word, | |
| 110 size_t word_num) { | |
| 111 _bm.mostly_disjoint_range_union(from_bitmap, | |
| 112 from_start_index, | |
| 113 heapWordToOffset(to_start_word), | |
| 114 word_num); | |
| 115 } | |
| 116 | |
| 117 #ifndef PRODUCT | |
| 118 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
| 119 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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120 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
| 342 | 121 "size inconsistency"); |
| 122 return _bmStartWord == (HeapWord*)(rs.base()) && | |
| 123 _bmWordSize == rs.size()>>LogHeapWordSize; | |
| 124 } | |
| 125 #endif | |
| 126 | |
| 127 void CMBitMap::clearAll() { | |
| 128 _bm.clear(); | |
| 129 return; | |
| 130 } | |
| 131 | |
| 132 void CMBitMap::markRange(MemRegion mr) { | |
| 133 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 134 assert(!mr.is_empty(), "unexpected empty region"); | |
| 135 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 136 ((HeapWord *) mr.end())), | |
| 137 "markRange memory region end is not card aligned"); | |
| 138 // convert address range into offset range | |
| 139 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 140 heapWordToOffset(mr.end()), true); | |
| 141 } | |
| 142 | |
| 143 void CMBitMap::clearRange(MemRegion mr) { | |
| 144 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 145 assert(!mr.is_empty(), "unexpected empty region"); | |
| 146 // convert address range into offset range | |
| 147 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 148 heapWordToOffset(mr.end()), false); | |
| 149 } | |
| 150 | |
| 151 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 152 HeapWord* end_addr) { | |
| 153 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 154 start = MIN2(start, end_addr); | |
| 155 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 156 end = MIN2(end, end_addr); | |
| 157 assert(start <= end, "Consistency check"); | |
| 158 MemRegion mr(start, end); | |
| 159 if (!mr.is_empty()) { | |
| 160 clearRange(mr); | |
| 161 } | |
| 162 return mr; | |
| 163 } | |
| 164 | |
| 165 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 166 _base(NULL), _cm(cm) | |
| 167 #ifdef ASSERT | |
| 168 , _drain_in_progress(false) | |
| 169 , _drain_in_progress_yields(false) | |
| 170 #endif | |
| 171 {} | |
| 172 | |
| 173 void CMMarkStack::allocate(size_t size) { | |
| 174 _base = NEW_C_HEAP_ARRAY(oop, size); | |
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175 if (_base == NULL) { |
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176 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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177 } |
| 342 | 178 _index = 0; |
| 179 _capacity = (jint) size; | |
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180 _saved_index = -1; |
| 342 | 181 NOT_PRODUCT(_max_depth = 0); |
| 182 } | |
| 183 | |
| 184 CMMarkStack::~CMMarkStack() { | |
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185 if (_base != NULL) { |
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186 FREE_C_HEAP_ARRAY(oop, _base); |
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187 } |
| 342 | 188 } |
| 189 | |
| 190 void CMMarkStack::par_push(oop ptr) { | |
| 191 while (true) { | |
| 192 if (isFull()) { | |
| 193 _overflow = true; | |
| 194 return; | |
| 195 } | |
| 196 // Otherwise... | |
| 197 jint index = _index; | |
| 198 jint next_index = index+1; | |
| 199 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 200 if (res == index) { | |
| 201 _base[index] = ptr; | |
| 202 // Note that we don't maintain this atomically. We could, but it | |
| 203 // doesn't seem necessary. | |
| 204 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 205 return; | |
| 206 } | |
| 207 // Otherwise, we need to try again. | |
| 208 } | |
| 209 } | |
| 210 | |
| 211 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 212 while (true) { | |
| 213 if (isFull()) { | |
| 214 _overflow = true; | |
| 215 return; | |
| 216 } | |
| 217 // Otherwise... | |
| 218 jint index = _index; | |
| 219 jint next_index = index + n; | |
| 220 if (next_index > _capacity) { | |
| 221 _overflow = true; | |
| 222 return; | |
| 223 } | |
| 224 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 225 if (res == index) { | |
| 226 for (int i = 0; i < n; i++) { | |
| 227 int ind = index + i; | |
| 228 assert(ind < _capacity, "By overflow test above."); | |
| 229 _base[ind] = ptr_arr[i]; | |
| 230 } | |
| 231 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 232 return; | |
| 233 } | |
| 234 // Otherwise, we need to try again. | |
| 235 } | |
| 236 } | |
| 237 | |
| 238 | |
| 239 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 240 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 241 jint start = _index; | |
| 242 jint next_index = start + n; | |
| 243 if (next_index > _capacity) { | |
| 244 _overflow = true; | |
| 245 return; | |
| 246 } | |
| 247 // Otherwise. | |
| 248 _index = next_index; | |
| 249 for (int i = 0; i < n; i++) { | |
| 250 int ind = start + i; | |
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251 assert(ind < _capacity, "By overflow test above."); |
| 342 | 252 _base[ind] = ptr_arr[i]; |
| 253 } | |
| 254 } | |
| 255 | |
| 256 | |
| 257 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 258 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 259 jint index = _index; | |
| 260 if (index == 0) { | |
| 261 *n = 0; | |
| 262 return false; | |
| 263 } else { | |
| 264 int k = MIN2(max, index); | |
| 265 jint new_ind = index - k; | |
| 266 for (int j = 0; j < k; j++) { | |
| 267 ptr_arr[j] = _base[new_ind + j]; | |
| 268 } | |
| 269 _index = new_ind; | |
| 270 *n = k; | |
| 271 return true; | |
| 272 } | |
| 273 } | |
| 274 | |
| 275 CMRegionStack::CMRegionStack() : _base(NULL) {} | |
| 276 | |
| 277 void CMRegionStack::allocate(size_t size) { | |
| 278 _base = NEW_C_HEAP_ARRAY(MemRegion, size); | |
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279 if (_base == NULL) { |
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280 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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281 } |
| 342 | 282 _index = 0; |
| 283 _capacity = (jint) size; | |
| 284 } | |
| 285 | |
| 286 CMRegionStack::~CMRegionStack() { | |
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287 if (_base != NULL) { |
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288 FREE_C_HEAP_ARRAY(oop, _base); |
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289 } |
| 342 | 290 } |
| 291 | |
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292 void CMRegionStack::push_lock_free(MemRegion mr) { |
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293 guarantee(false, "push_lock_free(): don't call this any more"); |
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294 |
| 342 | 295 assert(mr.word_size() > 0, "Precondition"); |
| 296 while (true) { | |
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297 jint index = _index; |
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298 |
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299 if (index >= _capacity) { |
| 342 | 300 _overflow = true; |
| 301 return; | |
| 302 } | |
| 303 // Otherwise... | |
| 304 jint next_index = index+1; | |
| 305 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 306 if (res == index) { | |
| 307 _base[index] = mr; | |
| 308 return; | |
| 309 } | |
| 310 // Otherwise, we need to try again. | |
| 311 } | |
| 312 } | |
| 313 | |
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314 // Lock-free pop of the region stack. Called during the concurrent |
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315 // marking / remark phases. Should only be called in tandem with |
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316 // other lock-free pops. |
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317 MemRegion CMRegionStack::pop_lock_free() { |
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318 guarantee(false, "pop_lock_free(): don't call this any more"); |
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319 |
| 342 | 320 while (true) { |
| 321 jint index = _index; | |
| 322 | |
| 323 if (index == 0) { | |
| 324 return MemRegion(); | |
| 325 } | |
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326 // Otherwise... |
| 342 | 327 jint next_index = index-1; |
| 328 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 329 if (res == index) { | |
| 330 MemRegion mr = _base[next_index]; | |
| 331 if (mr.start() != NULL) { | |
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332 assert(mr.end() != NULL, "invariant"); |
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333 assert(mr.word_size() > 0, "invariant"); |
| 342 | 334 return mr; |
| 335 } else { | |
| 336 // that entry was invalidated... let's skip it | |
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337 assert(mr.end() == NULL, "invariant"); |
| 342 | 338 } |
| 339 } | |
| 340 // Otherwise, we need to try again. | |
| 341 } | |
| 342 } | |
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343 |
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344 #if 0 |
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345 // The routines that manipulate the region stack with a lock are |
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346 // not currently used. They should be retained, however, as a |
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347 // diagnostic aid. |
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348 |
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349 void CMRegionStack::push_with_lock(MemRegion mr) { |
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350 assert(mr.word_size() > 0, "Precondition"); |
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351 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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352 |
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353 if (isFull()) { |
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354 _overflow = true; |
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355 return; |
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356 } |
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357 |
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358 _base[_index] = mr; |
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359 _index += 1; |
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360 } |
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361 |
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362 MemRegion CMRegionStack::pop_with_lock() { |
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363 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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364 |
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365 while (true) { |
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366 if (_index == 0) { |
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367 return MemRegion(); |
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368 } |
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369 _index -= 1; |
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370 |
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371 MemRegion mr = _base[_index]; |
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372 if (mr.start() != NULL) { |
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373 assert(mr.end() != NULL, "invariant"); |
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374 assert(mr.word_size() > 0, "invariant"); |
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375 return mr; |
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376 } else { |
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377 // that entry was invalidated... let's skip it |
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378 assert(mr.end() == NULL, "invariant"); |
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379 } |
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380 } |
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381 } |
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382 #endif |
| 342 | 383 |
| 384 bool CMRegionStack::invalidate_entries_into_cset() { | |
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385 guarantee(false, "invalidate_entries_into_cset(): don't call this any more"); |
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386 |
| 342 | 387 bool result = false; |
| 388 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 389 for (int i = 0; i < _oops_do_bound; ++i) { | |
| 390 MemRegion mr = _base[i]; | |
| 391 if (mr.start() != NULL) { | |
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392 assert(mr.end() != NULL, "invariant"); |
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393 assert(mr.word_size() > 0, "invariant"); |
| 342 | 394 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
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395 assert(hr != NULL, "invariant"); |
| 342 | 396 if (hr->in_collection_set()) { |
| 397 // The region points into the collection set | |
| 398 _base[i] = MemRegion(); | |
| 399 result = true; | |
| 400 } | |
| 401 } else { | |
| 402 // that entry was invalidated... let's skip it | |
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403 assert(mr.end() == NULL, "invariant"); |
| 342 | 404 } |
| 405 } | |
| 406 return result; | |
| 407 } | |
| 408 | |
| 409 template<class OopClosureClass> | |
| 410 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 411 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 412 || SafepointSynchronize::is_at_safepoint(), | |
| 413 "Drain recursion must be yield-safe."); | |
| 414 bool res = true; | |
| 415 debug_only(_drain_in_progress = true); | |
| 416 debug_only(_drain_in_progress_yields = yield_after); | |
| 417 while (!isEmpty()) { | |
| 418 oop newOop = pop(); | |
| 419 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 420 assert(newOop->is_oop(), "Expected an oop"); | |
| 421 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 422 "only grey objects on this stack"); | |
| 423 // iterate over the oops in this oop, marking and pushing | |
| 424 // the ones in CMS generation. | |
| 425 newOop->oop_iterate(cl); | |
| 426 if (yield_after && _cm->do_yield_check()) { | |
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427 res = false; |
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428 break; |
| 342 | 429 } |
| 430 } | |
| 431 debug_only(_drain_in_progress = false); | |
| 432 return res; | |
| 433 } | |
| 434 | |
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435 void CMMarkStack::note_start_of_gc() { |
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436 assert(_saved_index == -1, |
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437 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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438 _saved_index = _index; |
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439 } |
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440 |
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441 void CMMarkStack::note_end_of_gc() { |
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442 // This is intentionally a guarantee, instead of an assert. If we |
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443 // accidentally add something to the mark stack during GC, it |
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444 // will be a correctness issue so it's better if we crash. we'll |
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445 // only check this once per GC anyway, so it won't be a performance |
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446 // issue in any way. |
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447 guarantee(_saved_index == _index, |
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448 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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449 _saved_index = -1; |
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450 } |
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451 |
| 342 | 452 void CMMarkStack::oops_do(OopClosure* f) { |
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453 assert(_saved_index == _index, |
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454 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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455 for (int i = 0; i < _index; i += 1) { |
| 342 | 456 f->do_oop(&_base[i]); |
| 457 } | |
| 458 } | |
| 459 | |
| 460 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
| 461 return (_g1h->is_obj_ill(obj) | |
| 462 || (_g1h->is_in_permanent(obj) | |
| 463 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
| 464 } | |
| 465 | |
| 466 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 467 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 468 #endif // _MSC_VER | |
| 469 | |
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470 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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471 return MAX2((n_par_threads + 2) / 4, 1U); |
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472 } |
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473 |
| 342 | 474 ConcurrentMark::ConcurrentMark(ReservedSpace rs, |
| 475 int max_regions) : | |
| 476 _markBitMap1(rs, MinObjAlignment - 1), | |
| 477 _markBitMap2(rs, MinObjAlignment - 1), | |
| 478 | |
| 479 _parallel_marking_threads(0), | |
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480 _max_parallel_marking_threads(0), |
| 342 | 481 _sleep_factor(0.0), |
| 482 _marking_task_overhead(1.0), | |
| 483 _cleanup_sleep_factor(0.0), | |
| 484 _cleanup_task_overhead(1.0), | |
| 2152 | 485 _cleanup_list("Cleanup List"), |
| 342 | 486 _region_bm(max_regions, false /* in_resource_area*/), |
| 487 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
| 488 CardTableModRefBS::card_shift, | |
| 489 false /* in_resource_area*/), | |
| 490 _prevMarkBitMap(&_markBitMap1), | |
| 491 _nextMarkBitMap(&_markBitMap2), | |
| 492 _at_least_one_mark_complete(false), | |
| 493 | |
| 494 _markStack(this), | |
| 495 _regionStack(), | |
| 496 // _finger set in set_non_marking_state | |
| 497 | |
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498 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 499 // _active_tasks set in set_non_marking_state |
| 500 // _tasks set inside the constructor | |
| 501 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
| 502 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
| 503 | |
| 504 _has_overflown(false), | |
| 505 _concurrent(false), | |
|
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506 _has_aborted(false), |
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507 _restart_for_overflow(false), |
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508 _concurrent_marking_in_progress(false), |
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509 _should_gray_objects(false), |
| 342 | 510 |
| 511 // _verbose_level set below | |
| 512 | |
| 513 _init_times(), | |
| 514 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 515 _cleanup_times(), | |
| 516 _total_counting_time(0.0), | |
| 517 _total_rs_scrub_time(0.0), | |
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518 _parallel_workers(NULL) { |
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519 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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520 if (verbose_level < no_verbose) { |
| 342 | 521 verbose_level = no_verbose; |
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522 } |
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523 if (verbose_level > high_verbose) { |
| 342 | 524 verbose_level = high_verbose; |
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525 } |
| 342 | 526 _verbose_level = verbose_level; |
| 527 | |
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528 if (verbose_low()) { |
| 342 | 529 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
| 530 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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531 } |
| 342 | 532 |
| 1284 | 533 _markStack.allocate(MarkStackSize); |
| 751 | 534 _regionStack.allocate(G1MarkRegionStackSize); |
| 342 | 535 |
| 536 // Create & start a ConcurrentMark thread. | |
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537 _cmThread = new ConcurrentMarkThread(this); |
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538 assert(cmThread() != NULL, "CM Thread should have been created"); |
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539 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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540 |
| 342 | 541 _g1h = G1CollectedHeap::heap(); |
| 542 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
| 543 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
| 544 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
| 545 | |
| 546 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 547 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 548 |
| 549 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
| 550 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
| 551 | |
| 552 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail | |
| 553 _active_tasks = _max_task_num; | |
| 554 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 555 CMTaskQueue* task_queue = new CMTaskQueue(); | |
| 556 task_queue->initialize(); | |
| 557 _task_queues->register_queue(i, task_queue); | |
| 558 | |
| 559 _tasks[i] = new CMTask(i, this, task_queue, _task_queues); | |
| 560 _accum_task_vtime[i] = 0.0; | |
| 561 } | |
| 562 | |
| 1284 | 563 if (ConcGCThreads > ParallelGCThreads) { |
| 564 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
| 342 | 565 "than ParallelGCThreads."); |
| 566 } | |
| 567 if (ParallelGCThreads == 0) { | |
| 568 // if we are not running with any parallel GC threads we will not | |
| 569 // spawn any marking threads either | |
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570 _parallel_marking_threads = 0; |
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571 _max_parallel_marking_threads = 0; |
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572 _sleep_factor = 0.0; |
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573 _marking_task_overhead = 1.0; |
| 342 | 574 } else { |
| 1284 | 575 if (ConcGCThreads > 0) { |
| 576 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
| 342 | 577 // if both are set |
| 578 | |
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579 _parallel_marking_threads = (uint) ConcGCThreads; |
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580 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 581 _sleep_factor = 0.0; |
| 582 _marking_task_overhead = 1.0; | |
| 751 | 583 } else if (G1MarkingOverheadPercent > 0) { |
| 342 | 584 // we will calculate the number of parallel marking threads |
| 585 // based on a target overhead with respect to the soft real-time | |
| 586 // goal | |
| 587 | |
| 751 | 588 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 589 double overall_cm_overhead = |
| 751 | 590 (double) MaxGCPauseMillis * marking_overhead / |
| 591 (double) GCPauseIntervalMillis; | |
| 342 | 592 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 593 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 594 double marking_task_overhead = | |
| 595 overall_cm_overhead / marking_thread_num * | |
| 596 (double) os::processor_count(); | |
| 597 double sleep_factor = | |
| 598 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 599 | |
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600 _parallel_marking_threads = (uint) marking_thread_num; |
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601 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 602 _sleep_factor = sleep_factor; |
| 603 _marking_task_overhead = marking_task_overhead; | |
| 604 } else { | |
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605 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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606 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 607 _sleep_factor = 0.0; |
| 608 _marking_task_overhead = 1.0; | |
| 609 } | |
| 610 | |
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611 if (parallel_marking_threads() > 1) { |
| 342 | 612 _cleanup_task_overhead = 1.0; |
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613 } else { |
| 342 | 614 _cleanup_task_overhead = marking_task_overhead(); |
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615 } |
| 342 | 616 _cleanup_sleep_factor = |
| 617 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 618 | |
| 619 #if 0 | |
| 620 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 621 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 622 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 623 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 624 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 625 #endif | |
| 626 | |
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627 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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628 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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629 _max_parallel_marking_threads, false, true); |
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630 if (_parallel_workers == NULL) { |
| 342 | 631 vm_exit_during_initialization("Failed necessary allocation."); |
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632 } else { |
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633 _parallel_workers->initialize_workers(); |
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634 } |
| 342 | 635 } |
| 636 | |
| 637 // so that the call below can read a sensible value | |
| 638 _heap_start = (HeapWord*) rs.base(); | |
| 639 set_non_marking_state(); | |
| 640 } | |
| 641 | |
| 642 void ConcurrentMark::update_g1_committed(bool force) { | |
| 643 // If concurrent marking is not in progress, then we do not need to | |
| 644 // update _heap_end. This has a subtle and important | |
| 645 // side-effect. Imagine that two evacuation pauses happen between | |
| 646 // marking completion and remark. The first one can grow the | |
| 647 // heap (hence now the finger is below the heap end). Then, the | |
| 648 // second one could unnecessarily push regions on the region | |
| 649 // stack. This causes the invariant that the region stack is empty | |
| 650 // at the beginning of remark to be false. By ensuring that we do | |
| 651 // not observe heap expansions after marking is complete, then we do | |
| 652 // not have this problem. | |
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653 if (!concurrent_marking_in_progress() && !force) return; |
| 342 | 654 |
| 655 MemRegion committed = _g1h->g1_committed(); | |
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656 assert(committed.start() == _heap_start, "start shouldn't change"); |
| 342 | 657 HeapWord* new_end = committed.end(); |
| 658 if (new_end > _heap_end) { | |
| 659 // The heap has been expanded. | |
| 660 | |
| 661 _heap_end = new_end; | |
| 662 } | |
| 663 // Notice that the heap can also shrink. However, this only happens | |
| 664 // during a Full GC (at least currently) and the entire marking | |
| 665 // phase will bail out and the task will not be restarted. So, let's | |
| 666 // do nothing. | |
| 667 } | |
| 668 | |
| 669 void ConcurrentMark::reset() { | |
| 670 // Starting values for these two. This should be called in a STW | |
| 671 // phase. CM will be notified of any future g1_committed expansions | |
| 672 // will be at the end of evacuation pauses, when tasks are | |
| 673 // inactive. | |
| 674 MemRegion committed = _g1h->g1_committed(); | |
| 675 _heap_start = committed.start(); | |
| 676 _heap_end = committed.end(); | |
| 677 | |
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678 // Separated the asserts so that we know which one fires. |
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679 assert(_heap_start != NULL, "heap bounds should look ok"); |
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680 assert(_heap_end != NULL, "heap bounds should look ok"); |
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681 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 682 |
| 683 // reset all the marking data structures and any necessary flags | |
| 684 clear_marking_state(); | |
| 685 | |
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686 if (verbose_low()) { |
| 342 | 687 gclog_or_tty->print_cr("[global] resetting"); |
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688 } |
| 342 | 689 |
| 690 // We do reset all of them, since different phases will use | |
| 691 // different number of active threads. So, it's easiest to have all | |
| 692 // of them ready. | |
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693 for (int i = 0; i < (int) _max_task_num; ++i) { |
| 342 | 694 _tasks[i]->reset(_nextMarkBitMap); |
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695 } |
| 342 | 696 |
| 697 // we need this to make sure that the flag is on during the evac | |
| 698 // pause with initial mark piggy-backed | |
| 699 set_concurrent_marking_in_progress(); | |
| 700 } | |
| 701 | |
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702 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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703 assert(active_tasks <= _max_task_num, "we should not have more"); |
| 342 | 704 |
| 705 _active_tasks = active_tasks; | |
| 706 // Need to update the three data structures below according to the | |
| 707 // number of active threads for this phase. | |
| 708 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 709 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 710 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 711 | |
| 712 _concurrent = concurrent; | |
| 713 // We propagate this to all tasks, not just the active ones. | |
| 714 for (int i = 0; i < (int) _max_task_num; ++i) | |
| 715 _tasks[i]->set_concurrent(concurrent); | |
| 716 | |
| 717 if (concurrent) { | |
| 718 set_concurrent_marking_in_progress(); | |
| 719 } else { | |
| 720 // We currently assume that the concurrent flag has been set to | |
| 721 // false before we start remark. At this point we should also be | |
| 722 // in a STW phase. | |
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723 assert(!concurrent_marking_in_progress(), "invariant"); |
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724 assert(_finger == _heap_end, "only way to get here"); |
| 342 | 725 update_g1_committed(true); |
| 726 } | |
| 727 } | |
| 728 | |
| 729 void ConcurrentMark::set_non_marking_state() { | |
| 730 // We set the global marking state to some default values when we're | |
| 731 // not doing marking. | |
| 732 clear_marking_state(); | |
| 733 _active_tasks = 0; | |
| 734 clear_concurrent_marking_in_progress(); | |
| 735 } | |
| 736 | |
| 737 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 738 // The ConcurrentMark instance is never freed. |
| 739 ShouldNotReachHere(); | |
| 342 | 740 } |
| 741 | |
| 742 // This closure is used to mark refs into the g1 generation | |
| 743 // from external roots in the CMS bit map. | |
| 744 // Called at the first checkpoint. | |
| 745 // | |
| 746 | |
| 747 void ConcurrentMark::clearNextBitmap() { | |
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748 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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749 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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750 |
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751 // Make sure that the concurrent mark thread looks to still be in |
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752 // the current cycle. |
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753 guarantee(cmThread()->during_cycle(), "invariant"); |
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754 |
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755 // We are finishing up the current cycle by clearing the next |
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756 // marking bitmap and getting it ready for the next cycle. During |
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757 // this time no other cycle can start. So, let's make sure that this |
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758 // is the case. |
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759 guarantee(!g1h->mark_in_progress(), "invariant"); |
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760 |
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761 // clear the mark bitmap (no grey objects to start with). |
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762 // We need to do this in chunks and offer to yield in between |
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763 // each chunk. |
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764 HeapWord* start = _nextMarkBitMap->startWord(); |
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765 HeapWord* end = _nextMarkBitMap->endWord(); |
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766 HeapWord* cur = start; |
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767 size_t chunkSize = M; |
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768 while (cur < end) { |
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769 HeapWord* next = cur + chunkSize; |
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770 if (next > end) { |
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771 next = end; |
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772 } |
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773 MemRegion mr(cur,next); |
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774 _nextMarkBitMap->clearRange(mr); |
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775 cur = next; |
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776 do_yield_check(); |
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777 |
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778 // Repeat the asserts from above. We'll do them as asserts here to |
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779 // minimize their overhead on the product. However, we'll have |
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780 // them as guarantees at the beginning / end of the bitmap |
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781 // clearing to get some checking in the product. |
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782 assert(cmThread()->during_cycle(), "invariant"); |
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783 assert(!g1h->mark_in_progress(), "invariant"); |
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784 } |
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|
785 |
|
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786 // Repeat the asserts from above. |
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787 guarantee(cmThread()->during_cycle(), "invariant"); |
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788 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 789 } |
| 790 | |
| 791 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
| 792 public: | |
| 793 bool doHeapRegion(HeapRegion* r) { | |
| 794 if (!r->continuesHumongous()) { | |
|
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795 r->note_start_of_marking(); |
| 342 | 796 } |
| 797 return false; | |
| 798 } | |
| 799 }; | |
| 800 | |
| 801 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 802 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 803 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 804 | |
| 805 _has_aborted = false; | |
| 806 | |
|
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807 #ifndef PRODUCT |
| 1044 | 808 if (G1PrintReachableAtInitialMark) { |
| 1388 | 809 print_reachable("at-cycle-start", |
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810 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 811 } |
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812 #endif |
| 342 | 813 |
| 814 // Initialise marking structures. This has to be done in a STW phase. | |
| 815 reset(); | |
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816 |
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817 // For each region note start of marking. |
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818 NoteStartOfMarkHRClosure startcl; |
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819 g1h->heap_region_iterate(&startcl); |
| 342 | 820 } |
| 821 | |
| 822 | |
| 823 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 824 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 825 | |
|
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826 // If we force an overflow during remark, the remark operation will |
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827 // actually abort and we'll restart concurrent marking. If we always |
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828 // force an oveflow during remark we'll never actually complete the |
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829 // marking phase. So, we initilize this here, at the start of the |
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830 // cycle, so that at the remaining overflow number will decrease at |
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831 // every remark and we'll eventually not need to cause one. |
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832 force_overflow_stw()->init(); |
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833 |
|
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834 // Start Concurrent Marking weak-reference discovery. |
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835 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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836 // enable ("weak") refs discovery |
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837 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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838 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 839 |
| 840 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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841 // This is the start of the marking cycle, we're expected all |
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842 // threads to have SATB queues with active set to false. |
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843 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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844 false /* expected_active */); |
| 342 | 845 |
| 846 // update_g1_committed() will be called at the end of an evac pause | |
| 847 // when marking is on. So, it's also called at the end of the | |
| 848 // initial-mark pause to update the heap end, if the heap expands | |
| 849 // during it. No need to call it here. | |
| 850 } | |
| 851 | |
| 852 /* | |
|
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853 * Notice that in the next two methods, we actually leave the STS |
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854 * during the barrier sync and join it immediately afterwards. If we |
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855 * do not do this, the following deadlock can occur: one thread could |
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856 * be in the barrier sync code, waiting for the other thread to also |
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857 * sync up, whereas another one could be trying to yield, while also |
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858 * waiting for the other threads to sync up too. |
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859 * |
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860 * Note, however, that this code is also used during remark and in |
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861 * this case we should not attempt to leave / enter the STS, otherwise |
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862 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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863 * (product). So we should only leave / enter the STS if we are |
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864 * operating concurrently. |
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865 * |
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866 * Because the thread that does the sync barrier has left the STS, it |
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867 * is possible to be suspended for a Full GC or an evacuation pause |
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868 * could occur. This is actually safe, since the entering the sync |
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869 * barrier is one of the last things do_marking_step() does, and it |
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870 * doesn't manipulate any data structures afterwards. |
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871 */ |
| 342 | 872 |
| 873 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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874 if (verbose_low()) { |
| 342 | 875 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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876 } |
| 342 | 877 |
|
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878 if (concurrent()) { |
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879 ConcurrentGCThread::stsLeave(); |
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880 } |
| 342 | 881 _first_overflow_barrier_sync.enter(); |
|
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882 if (concurrent()) { |
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883 ConcurrentGCThread::stsJoin(); |
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884 } |
| 342 | 885 // at this point everyone should have synced up and not be doing any |
| 886 // more work | |
| 887 | |
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888 if (verbose_low()) { |
| 342 | 889 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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890 } |
| 342 | 891 |
| 892 // let task 0 do this | |
| 893 if (task_num == 0) { | |
| 894 // task 0 is responsible for clearing the global data structures | |
|
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895 // We should be here because of an overflow. During STW we should |
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896 // not clear the overflow flag since we rely on it being true when |
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897 // we exit this method to abort the pause and restart concurent |
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898 // marking. |
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899 clear_marking_state(concurrent() /* clear_overflow */); |
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900 force_overflow()->update(); |
| 342 | 901 |
| 902 if (PrintGC) { | |
| 903 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
| 904 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 905 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
| 906 } | |
| 907 } | |
| 908 | |
| 909 // after this, each task should reset its own data structures then | |
| 910 // then go into the second barrier | |
| 911 } | |
| 912 | |
| 913 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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914 if (verbose_low()) { |
| 342 | 915 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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916 } |
| 342 | 917 |
|
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918 if (concurrent()) { |
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919 ConcurrentGCThread::stsLeave(); |
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920 } |
| 342 | 921 _second_overflow_barrier_sync.enter(); |
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922 if (concurrent()) { |
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923 ConcurrentGCThread::stsJoin(); |
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924 } |
| 342 | 925 // at this point everything should be re-initialised and ready to go |
| 926 | |
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927 if (verbose_low()) { |
| 342 | 928 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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929 } |
| 342 | 930 } |
| 931 | |
|
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932 #ifndef PRODUCT |
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933 void ForceOverflowSettings::init() { |
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934 _num_remaining = G1ConcMarkForceOverflow; |
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935 _force = false; |
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936 update(); |
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937 } |
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938 |
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939 void ForceOverflowSettings::update() { |
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940 if (_num_remaining > 0) { |
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941 _num_remaining -= 1; |
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942 _force = true; |
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943 } else { |
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944 _force = false; |
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945 } |
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946 } |
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947 |
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948 bool ForceOverflowSettings::should_force() { |
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949 if (_force) { |
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950 _force = false; |
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951 return true; |
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952 } else { |
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953 return false; |
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954 } |
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955 } |
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956 #endif // !PRODUCT |
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957 |
| 342 | 958 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { |
|
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959 guarantee(false, "grayRegionIfNecessary(): don't call this any more"); |
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960 |
| 342 | 961 // The objects on the region have already been marked "in bulk" by |
| 962 // the caller. We only need to decide whether to push the region on | |
| 963 // the region stack or not. | |
| 964 | |
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965 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
| 342 | 966 // We're done with marking and waiting for remark. We do not need to |
| 967 // push anything else on the region stack. | |
| 968 return; | |
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969 } |
| 342 | 970 |
| 971 HeapWord* finger = _finger; | |
| 972 | |
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973 if (verbose_low()) { |
| 342 | 974 gclog_or_tty->print_cr("[global] attempting to push " |
| 975 "region ["PTR_FORMAT", "PTR_FORMAT"), finger is at " | |
| 976 PTR_FORMAT, mr.start(), mr.end(), finger); | |
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977 } |
| 342 | 978 |
| 979 if (mr.start() < finger) { | |
| 980 // The finger is always heap region aligned and it is not possible | |
| 981 // for mr to span heap regions. | |
|
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982 assert(mr.end() <= finger, "invariant"); |
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983 |
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984 // Separated the asserts so that we know which one fires. |
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985 assert(mr.start() <= mr.end(), |
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986 "region boundaries should fall within the committed space"); |
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987 assert(_heap_start <= mr.start(), |
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988 "region boundaries should fall within the committed space"); |
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989 assert(mr.end() <= _heap_end, |
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990 "region boundaries should fall within the committed space"); |
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991 if (verbose_low()) { |
| 342 | 992 gclog_or_tty->print_cr("[global] region ["PTR_FORMAT", "PTR_FORMAT") " |
| 993 "below the finger, pushing it", | |
| 994 mr.start(), mr.end()); | |
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995 } |
| 342 | 996 |
|
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997 if (!region_stack_push_lock_free(mr)) { |
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998 if (verbose_low()) { |
| 342 | 999 gclog_or_tty->print_cr("[global] region stack has overflown."); |
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1000 } |
| 342 | 1001 } |
| 1002 } | |
| 1003 } | |
| 1004 | |
| 1005 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
|
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1006 guarantee(false, "markAndGrayObjectIfNecessary(): don't call this any more"); |
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1007 |
| 342 | 1008 // The object is not marked by the caller. We need to at least mark |
| 1009 // it and maybe push in on the stack. | |
| 1010 | |
| 1011 HeapWord* addr = (HeapWord*)p; | |
| 1012 if (!_nextMarkBitMap->isMarked(addr)) { | |
| 1013 // We definitely need to mark it, irrespective whether we bail out | |
| 1014 // because we're done with marking. | |
| 1015 if (_nextMarkBitMap->parMark(addr)) { | |
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1016 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
| 342 | 1017 // If we're done with concurrent marking and we're waiting for |
| 1018 // remark, then we're not pushing anything on the stack. | |
| 1019 return; | |
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1020 } |
| 342 | 1021 |
| 1022 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 1023 // CAS done in parMark(addr) above | |
| 1024 HeapWord* finger = _finger; | |
| 1025 | |
| 1026 if (addr < finger) { | |
| 1027 if (!mark_stack_push(oop(addr))) { | |
|
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1028 if (verbose_low()) { |
| 342 | 1029 gclog_or_tty->print_cr("[global] global stack overflow " |
| 1030 "during parMark"); | |
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1031 } |
| 342 | 1032 } |
| 1033 } | |
| 1034 } | |
| 1035 } | |
| 1036 } | |
| 1037 | |
| 1038 class CMConcurrentMarkingTask: public AbstractGangTask { | |
| 1039 private: | |
| 1040 ConcurrentMark* _cm; | |
| 1041 ConcurrentMarkThread* _cmt; | |
| 1042 | |
| 1043 public: | |
|
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1044 void work(uint worker_id) { |
|
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1045 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1046 "this should only be done by a conc GC thread"); |
|
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1047 ResourceMark rm; |
| 342 | 1048 |
| 1049 double start_vtime = os::elapsedVTime(); | |
| 1050 | |
| 1051 ConcurrentGCThread::stsJoin(); | |
| 1052 | |
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1053 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1054 CMTask* the_task = _cm->task(worker_id); |
| 342 | 1055 the_task->record_start_time(); |
| 1056 if (!_cm->has_aborted()) { | |
| 1057 do { | |
| 1058 double start_vtime_sec = os::elapsedVTime(); | |
| 1059 double start_time_sec = os::elapsedTime(); | |
|
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1060 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1061 |
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1062 the_task->do_marking_step(mark_step_duration_ms, |
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1063 true /* do_stealing */, |
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1064 true /* do_termination */); |
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1065 |
| 342 | 1066 double end_time_sec = os::elapsedTime(); |
| 1067 double end_vtime_sec = os::elapsedVTime(); | |
| 1068 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 1069 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 1070 _cm->clear_has_overflown(); | |
| 1071 | |
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1072 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 1073 |
| 1074 jlong sleep_time_ms; | |
| 1075 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 1076 sleep_time_ms = | |
| 1077 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 1078 ConcurrentGCThread::stsLeave(); | |
| 1079 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 1080 ConcurrentGCThread::stsJoin(); | |
| 1081 } | |
| 1082 double end_time2_sec = os::elapsedTime(); | |
| 1083 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 1084 | |
| 1085 #if 0 | |
| 1086 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 1087 "overhead %1.4lf", | |
| 1088 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 1089 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 1090 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 1091 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 1092 #endif | |
| 1093 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 1094 } | |
| 1095 the_task->record_end_time(); | |
|
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1096 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 1097 |
| 1098 ConcurrentGCThread::stsLeave(); | |
| 1099 | |
| 1100 double end_vtime = os::elapsedVTime(); | |
|
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1101 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 1102 } |
| 1103 | |
| 1104 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 1105 ConcurrentMarkThread* cmt) : | |
| 1106 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 1107 | |
| 1108 ~CMConcurrentMarkingTask() { } | |
| 1109 }; | |
| 1110 | |
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1111 // Calculates the number of active workers for a concurrent |
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1112 // phase. |
|
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1113 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 1114 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1115 uint n_conc_workers = 0; |
|
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1116 if (!UseDynamicNumberOfGCThreads || |
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1117 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1118 !ForceDynamicNumberOfGCThreads)) { |
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1119 n_conc_workers = max_parallel_marking_threads(); |
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1120 } else { |
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1121 n_conc_workers = |
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1122 AdaptiveSizePolicy::calc_default_active_workers( |
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1123 max_parallel_marking_threads(), |
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1124 1, /* Minimum workers */ |
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1125 parallel_marking_threads(), |
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1126 Threads::number_of_non_daemon_threads()); |
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1127 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1128 // that scaling has already gone into "_max_parallel_marking_threads". |
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1129 } |
| 4711 | 1130 assert(n_conc_workers > 0, "Always need at least 1"); |
| 1131 return n_conc_workers; | |
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1132 } |
| 4711 | 1133 // If we are not running with any parallel GC threads we will not |
| 1134 // have spawned any marking threads either. Hence the number of | |
| 1135 // concurrent workers should be 0. | |
| 1136 return 0; | |
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1137 } |
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1138 |
| 342 | 1139 void ConcurrentMark::markFromRoots() { |
| 1140 // we might be tempted to assert that: | |
| 1141 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1142 // "inconsistent argument?"); | |
| 1143 // However that wouldn't be right, because it's possible that | |
| 1144 // a safepoint is indeed in progress as a younger generation | |
| 1145 // stop-the-world GC happens even as we mark in this generation. | |
| 1146 | |
| 1147 _restart_for_overflow = false; | |
|
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1148 force_overflow_conc()->init(); |
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1149 |
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1150 // _g1h has _n_par_threads |
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1151 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1152 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1153 "Maximum number of marking threads exceeded"); |
| 4711 | 1154 |
|
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1155 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1156 |
| 1157 // Parallel task terminator is set in "set_phase()" | |
| 1158 set_phase(active_workers, true /* concurrent */); | |
| 342 | 1159 |
| 1160 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1161 if (parallel_marking_threads() > 0) { |
| 4711 | 1162 _parallel_workers->set_active_workers((int)active_workers); |
| 1163 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
| 1164 // and the decisions on that MT processing is made elsewhere. | |
| 1165 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1166 _parallel_workers->run_task(&markingTask); |
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1167 } else { |
| 342 | 1168 markingTask.work(0); |
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1169 } |
| 342 | 1170 print_stats(); |
| 1171 } | |
| 1172 | |
| 1173 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1174 // world is stopped at this checkpoint | |
| 1175 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1176 "world should be stopped"); | |
|
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1177 |
| 342 | 1178 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1179 | |
| 1180 // If a full collection has happened, we shouldn't do this. | |
| 1181 if (has_aborted()) { | |
| 1182 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1183 return; | |
| 1184 } | |
| 1185 | |
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1186 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1187 |
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1188 if (VerifyDuringGC) { |
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1189 HandleMark hm; // handle scope |
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1190 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1191 Universe::heap()->prepare_for_verify(); |
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1192 Universe::verify(/* allow dirty */ true, |
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1193 /* silent */ false, |
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1194 /* option */ VerifyOption_G1UsePrevMarking); |
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1195 } |
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1196 |
| 342 | 1197 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1198 g1p->record_concurrent_mark_remark_start(); | |
| 1199 | |
| 1200 double start = os::elapsedTime(); | |
| 1201 | |
| 1202 checkpointRootsFinalWork(); | |
| 1203 | |
| 1204 double mark_work_end = os::elapsedTime(); | |
| 1205 | |
| 1206 weakRefsWork(clear_all_soft_refs); | |
| 1207 | |
| 1208 if (has_overflown()) { | |
| 1209 // Oops. We overflowed. Restart concurrent marking. | |
| 1210 _restart_for_overflow = true; | |
| 1211 // Clear the flag. We do not need it any more. | |
| 1212 clear_has_overflown(); | |
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1213 if (G1TraceMarkStackOverflow) { |
| 342 | 1214 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1215 } |
| 342 | 1216 } else { |
| 2149 | 1217 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1218 // We're done with marking. |
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1219 // This is the end of the marking cycle, we're expected all |
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1220 // threads to have SATB queues with active set to true. |
| 2149 | 1221 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1222 true /* expected_active */); | |
| 811 | 1223 |
| 1224 if (VerifyDuringGC) { | |
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1225 HandleMark hm; // handle scope |
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1226 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1227 Universe::heap()->prepare_for_verify(); |
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1228 Universe::verify(/* allow dirty */ true, |
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1229 /* silent */ false, |
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1230 /* option */ VerifyOption_G1UseNextMarking); |
| 811 | 1231 } |
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1232 assert(!restart_for_overflow(), "sanity"); |
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1233 } |
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1234 |
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1235 // Reset the marking state if marking completed |
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1236 if (!restart_for_overflow()) { |
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1237 set_non_marking_state(); |
| 342 | 1238 } |
| 1239 | |
| 1240 #if VERIFY_OBJS_PROCESSED | |
| 1241 _scan_obj_cl.objs_processed = 0; | |
| 1242 ThreadLocalObjQueue::objs_enqueued = 0; | |
| 1243 #endif | |
| 1244 | |
| 1245 // Statistics | |
| 1246 double now = os::elapsedTime(); | |
| 1247 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1248 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1249 _remark_times.add((now - start) * 1000.0); | |
| 1250 | |
| 1251 g1p->record_concurrent_mark_remark_end(); | |
| 1252 } | |
| 1253 | |
| 1254 #define CARD_BM_TEST_MODE 0 | |
| 1255 | |
| 1256 class CalcLiveObjectsClosure: public HeapRegionClosure { | |
| 1257 | |
| 1258 CMBitMapRO* _bm; | |
| 1259 ConcurrentMark* _cm; | |
| 1260 bool _changed; | |
| 1261 bool _yield; | |
| 1262 size_t _words_done; | |
| 1263 size_t _tot_live; | |
| 1264 size_t _tot_used; | |
| 1265 size_t _regions_done; | |
| 1266 double _start_vtime_sec; | |
| 1267 | |
| 1268 BitMap* _region_bm; | |
| 1269 BitMap* _card_bm; | |
| 1270 intptr_t _bottom_card_num; | |
| 1271 bool _final; | |
| 1272 | |
| 1273 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
| 1274 for (intptr_t i = start_card_num; i <= last_card_num; i++) { | |
| 1275 #if CARD_BM_TEST_MODE | |
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1276 guarantee(_card_bm->at(i - _bottom_card_num), "Should already be set."); |
| 342 | 1277 #else |
| 1278 _card_bm->par_at_put(i - _bottom_card_num, 1); | |
| 1279 #endif | |
| 1280 } | |
| 1281 } | |
| 1282 | |
| 1283 public: | |
| 1284 CalcLiveObjectsClosure(bool final, | |
| 1285 CMBitMapRO *bm, ConcurrentMark *cm, | |
| 936 | 1286 BitMap* region_bm, BitMap* card_bm) : |
| 342 | 1287 _bm(bm), _cm(cm), _changed(false), _yield(true), |
| 1288 _words_done(0), _tot_live(0), _tot_used(0), | |
| 936 | 1289 _region_bm(region_bm), _card_bm(card_bm),_final(final), |
| 342 | 1290 _regions_done(0), _start_vtime_sec(0.0) |
| 1291 { | |
| 1292 _bottom_card_num = | |
| 1293 intptr_t(uintptr_t(G1CollectedHeap::heap()->reserved_region().start()) >> | |
| 1294 CardTableModRefBS::card_shift); | |
| 1295 } | |
| 1296 | |
| 829 | 1297 // It takes a region that's not empty (i.e., it has at least one |
| 1298 // live object in it and sets its corresponding bit on the region | |
| 1299 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1300 // to 1 the bits on the region bitmap that correspond to its | |
| 1301 // associated "continues humongous" regions. | |
| 1302 void set_bit_for_region(HeapRegion* hr) { | |
| 1303 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1304 | |
| 1305 size_t index = hr->hrs_index(); | |
| 1306 if (!hr->startsHumongous()) { | |
| 1307 // Normal (non-humongous) case: just set the bit. | |
| 1308 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
| 1309 } else { | |
| 1310 // Starts humongous case: calculate how many regions are part of | |
| 1311 // this humongous region and then set the bit range. It might | |
| 1312 // have been a bit more efficient to look at the object that | |
| 1313 // spans these humongous regions to calculate their number from | |
| 1314 // the object's size. However, it's a good idea to calculate | |
| 1315 // this based on the metadata itself, and not the region | |
| 1316 // contents, so that this code is not aware of what goes into | |
| 1317 // the humongous regions (in case this changes in the future). | |
| 1318 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1319 size_t end_index = index + 1; | |
| 831 | 1320 while (end_index < g1h->n_regions()) { |
| 1321 HeapRegion* chr = g1h->region_at(end_index); | |
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1322 if (!chr->continuesHumongous()) break; |
| 829 | 1323 end_index += 1; |
| 1324 } | |
| 1325 _region_bm->par_at_put_range((BitMap::idx_t) index, | |
| 1326 (BitMap::idx_t) end_index, true); | |
| 1327 } | |
| 1328 } | |
| 1329 | |
| 342 | 1330 bool doHeapRegion(HeapRegion* hr) { |
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1331 if (!_final && _regions_done == 0) { |
| 342 | 1332 _start_vtime_sec = os::elapsedVTime(); |
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1333 } |
| 342 | 1334 |
| 639 | 1335 if (hr->continuesHumongous()) { |
| 829 | 1336 // We will ignore these here and process them when their |
| 1337 // associated "starts humongous" region is processed (see | |
| 1338 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1339 // associated "starts humongous" region to have their bit set to | |
| 1340 // 1 since, due to the region chunking in the parallel region | |
| 1341 // iteration, a "continues humongous" region might be visited | |
| 1342 // before its associated "starts humongous". | |
| 639 | 1343 return false; |
| 1344 } | |
| 342 | 1345 |
| 1346 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
| 1347 HeapWord* start = hr->top_at_conc_mark_count(); | |
| 1348 assert(hr->bottom() <= start && start <= hr->end() && | |
| 1349 hr->bottom() <= nextTop && nextTop <= hr->end() && | |
| 1350 start <= nextTop, | |
| 1351 "Preconditions."); | |
| 1352 // Otherwise, record the number of word's we'll examine. | |
| 1353 size_t words_done = (nextTop - start); | |
| 1354 // Find the first marked object at or after "start". | |
| 1355 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
| 1356 size_t marked_bytes = 0; | |
| 1357 | |
| 1358 // Below, the term "card num" means the result of shifting an address | |
| 1359 // by the card shift -- address 0 corresponds to card number 0. One | |
| 1360 // must subtract the card num of the bottom of the heap to obtain a | |
| 1361 // card table index. | |
| 1362 // The first card num of the sequence of live cards currently being | |
| 1363 // constructed. -1 ==> no sequence. | |
| 1364 intptr_t start_card_num = -1; | |
| 1365 // The last card num of the sequence of live cards currently being | |
| 1366 // constructed. -1 ==> no sequence. | |
| 1367 intptr_t last_card_num = -1; | |
| 1368 | |
| 1369 while (start < nextTop) { | |
| 1370 if (_yield && _cm->do_yield_check()) { | |
| 1371 // We yielded. It might be for a full collection, in which case | |
| 1372 // all bets are off; terminate the traversal. | |
| 1373 if (_cm->has_aborted()) { | |
| 1374 _changed = false; | |
| 1375 return true; | |
| 1376 } else { | |
| 1377 // Otherwise, it might be a collection pause, and the region | |
| 1378 // we're looking at might be in the collection set. We'll | |
| 1379 // abandon this region. | |
| 1380 return false; | |
| 1381 } | |
| 1382 } | |
| 1383 oop obj = oop(start); | |
| 1384 int obj_sz = obj->size(); | |
| 1385 // The card num of the start of the current object. | |
| 1386 intptr_t obj_card_num = | |
| 1387 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
| 1388 | |
| 1389 HeapWord* obj_last = start + obj_sz - 1; | |
| 1390 intptr_t obj_last_card_num = | |
| 1391 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
| 1392 | |
| 1393 if (obj_card_num != last_card_num) { | |
| 1394 if (start_card_num == -1) { | |
| 1395 assert(last_card_num == -1, "Both or neither."); | |
| 1396 start_card_num = obj_card_num; | |
| 1397 } else { | |
| 1398 assert(last_card_num != -1, "Both or neither."); | |
| 1399 assert(obj_card_num >= last_card_num, "Inv"); | |
| 1400 if ((obj_card_num - last_card_num) > 1) { | |
| 1401 // Mark the last run, and start a new one. | |
| 1402 mark_card_num_range(start_card_num, last_card_num); | |
| 1403 start_card_num = obj_card_num; | |
| 1404 } | |
| 1405 } | |
| 1406 #if CARD_BM_TEST_MODE | |
| 1407 /* | |
| 1408 gclog_or_tty->print_cr("Setting bits from %d/%d.", | |
| 1409 obj_card_num - _bottom_card_num, | |
| 1410 obj_last_card_num - _bottom_card_num); | |
| 1411 */ | |
| 1412 for (intptr_t j = obj_card_num; j <= obj_last_card_num; j++) { | |
| 1413 _card_bm->par_at_put(j - _bottom_card_num, 1); | |
| 1414 } | |
| 1415 #endif | |
| 1416 } | |
| 1417 // In any case, we set the last card num. | |
| 1418 last_card_num = obj_last_card_num; | |
| 1419 | |
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1420 marked_bytes += (size_t)obj_sz * HeapWordSize; |
| 342 | 1421 // Find the next marked object after this one. |
| 1422 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
| 1423 _changed = true; | |
| 1424 } | |
| 1425 // Handle the last range, if any. | |
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1426 if (start_card_num != -1) { |
| 342 | 1427 mark_card_num_range(start_card_num, last_card_num); |
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1428 } |
| 342 | 1429 if (_final) { |
| 1430 // Mark the allocated-since-marking portion... | |
| 1431 HeapWord* tp = hr->top(); | |
| 1432 if (nextTop < tp) { | |
| 1433 start_card_num = | |
| 1434 intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); | |
| 1435 last_card_num = | |
| 1436 intptr_t(uintptr_t(tp) >> CardTableModRefBS::card_shift); | |
| 1437 mark_card_num_range(start_card_num, last_card_num); | |
| 1438 // This definitely means the region has live objects. | |
| 829 | 1439 set_bit_for_region(hr); |
| 342 | 1440 } |
| 1441 } | |
| 1442 | |
| 1443 hr->add_to_marked_bytes(marked_bytes); | |
| 1444 // Update the live region bitmap. | |
| 1445 if (marked_bytes > 0) { | |
| 829 | 1446 set_bit_for_region(hr); |
| 342 | 1447 } |
| 1448 hr->set_top_at_conc_mark_count(nextTop); | |
| 1449 _tot_live += hr->next_live_bytes(); | |
| 1450 _tot_used += hr->used(); | |
| 1451 _words_done = words_done; | |
| 1452 | |
| 1453 if (!_final) { | |
| 1454 ++_regions_done; | |
| 1455 if (_regions_done % 10 == 0) { | |
| 1456 double end_vtime_sec = os::elapsedVTime(); | |
| 1457 double elapsed_vtime_sec = end_vtime_sec - _start_vtime_sec; | |
| 1458 if (elapsed_vtime_sec > (10.0 / 1000.0)) { | |
| 1459 jlong sleep_time_ms = | |
| 1460 (jlong) (elapsed_vtime_sec * _cm->cleanup_sleep_factor() * 1000.0); | |
| 1461 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 1462 _start_vtime_sec = end_vtime_sec; | |
| 1463 } | |
| 1464 } | |
| 1465 } | |
| 1466 | |
| 1467 return false; | |
| 1468 } | |
| 1469 | |
| 1470 bool changed() { return _changed; } | |
| 1471 void reset() { _changed = false; _words_done = 0; } | |
| 1472 void no_yield() { _yield = false; } | |
| 1473 size_t words_done() { return _words_done; } | |
| 1474 size_t tot_live() { return _tot_live; } | |
| 1475 size_t tot_used() { return _tot_used; } | |
| 1476 }; | |
| 1477 | |
| 1478 | |
| 1479 void ConcurrentMark::calcDesiredRegions() { | |
| 1480 _region_bm.clear(); | |
| 1481 _card_bm.clear(); | |
| 1482 CalcLiveObjectsClosure calccl(false /*final*/, | |
| 1483 nextMarkBitMap(), this, | |
| 936 | 1484 &_region_bm, &_card_bm); |
| 342 | 1485 G1CollectedHeap *g1h = G1CollectedHeap::heap(); |
| 1486 g1h->heap_region_iterate(&calccl); | |
| 1487 | |
| 1488 do { | |
| 1489 calccl.reset(); | |
| 1490 g1h->heap_region_iterate(&calccl); | |
| 1491 } while (calccl.changed()); | |
| 1492 } | |
| 1493 | |
| 1494 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1495 protected: | |
| 1496 G1CollectedHeap* _g1h; | |
| 1497 CMBitMap* _bm; | |
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1498 uint _n_workers; |
| 342 | 1499 size_t *_live_bytes; |
| 1500 size_t *_used_bytes; | |
| 1501 BitMap* _region_bm; | |
| 1502 BitMap* _card_bm; | |
| 1503 public: | |
| 1504 G1ParFinalCountTask(G1CollectedHeap* g1h, CMBitMap* bm, | |
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1505 BitMap* region_bm, BitMap* card_bm) |
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1506 : AbstractGangTask("G1 final counting"), _g1h(g1h), |
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1507 _bm(bm), _region_bm(region_bm), _card_bm(card_bm), |
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1508 _n_workers(0) |
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1509 { |
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1510 // Use the value already set as the number of active threads |
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1511 // in the call to run_task(). Needed for the allocation of |
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1512 // _live_bytes and _used_bytes. |
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1513 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1514 assert( _g1h->workers()->active_workers() > 0, |
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1515 "Should have been previously set"); |
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1516 _n_workers = _g1h->workers()->active_workers(); |
|
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1517 } else { |
| 342 | 1518 _n_workers = 1; |
|
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1519 } |
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1520 |
| 342 | 1521 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); |
| 1522 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
| 1523 } | |
| 1524 | |
| 1525 ~G1ParFinalCountTask() { | |
| 1526 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
| 1527 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
| 1528 } | |
| 1529 | |
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1530 void work(uint worker_id) { |
| 342 | 1531 CalcLiveObjectsClosure calccl(true /*final*/, |
| 1532 _bm, _g1h->concurrent_mark(), | |
| 936 | 1533 _region_bm, _card_bm); |
| 342 | 1534 calccl.no_yield(); |
|
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1535 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1536 _g1h->heap_region_par_iterate_chunked(&calccl, worker_id, |
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1537 (int) _n_workers, |
| 355 | 1538 HeapRegion::FinalCountClaimValue); |
| 342 | 1539 } else { |
| 1540 _g1h->heap_region_iterate(&calccl); | |
| 1541 } | |
| 1542 assert(calccl.complete(), "Shouldn't have yielded!"); | |
| 1543 | |
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1544 assert(worker_id < _n_workers, "invariant"); |
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1545 _live_bytes[worker_id] = calccl.tot_live(); |
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1546 _used_bytes[worker_id] = calccl.tot_used(); |
| 342 | 1547 } |
| 1548 size_t live_bytes() { | |
| 1549 size_t live_bytes = 0; | |
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1550 for (uint i = 0; i < _n_workers; ++i) |
| 342 | 1551 live_bytes += _live_bytes[i]; |
| 1552 return live_bytes; | |
| 1553 } | |
| 1554 size_t used_bytes() { | |
| 1555 size_t used_bytes = 0; | |
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1556 for (uint i = 0; i < _n_workers; ++i) |
| 342 | 1557 used_bytes += _used_bytes[i]; |
| 1558 return used_bytes; | |
| 1559 } | |
| 1560 }; | |
| 1561 | |
| 1562 class G1ParNoteEndTask; | |
| 1563 | |
| 1564 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1565 G1CollectedHeap* _g1; | |
| 1566 int _worker_num; | |
| 1567 size_t _max_live_bytes; | |
| 1568 size_t _regions_claimed; | |
| 1569 size_t _freed_bytes; | |
| 2173 | 1570 FreeRegionList* _local_cleanup_list; |
| 4072 | 1571 OldRegionSet* _old_proxy_set; |
| 2173 | 1572 HumongousRegionSet* _humongous_proxy_set; |
| 1573 HRRSCleanupTask* _hrrs_cleanup_task; | |
| 342 | 1574 double _claimed_region_time; |
| 1575 double _max_region_time; | |
| 1576 | |
| 1577 public: | |
| 1578 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1579 int worker_num, |
| 1580 FreeRegionList* local_cleanup_list, | |
| 4072 | 1581 OldRegionSet* old_proxy_set, |
| 2173 | 1582 HumongousRegionSet* humongous_proxy_set, |
|
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1583 HRRSCleanupTask* hrrs_cleanup_task) : |
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1584 _g1(g1), _worker_num(worker_num), |
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1585 _max_live_bytes(0), _regions_claimed(0), |
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1586 _freed_bytes(0), |
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1587 _claimed_region_time(0.0), _max_region_time(0.0), |
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1588 _local_cleanup_list(local_cleanup_list), |
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1589 _old_proxy_set(old_proxy_set), |
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1590 _humongous_proxy_set(humongous_proxy_set), |
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1591 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1592 |
| 342 | 1593 size_t freed_bytes() { return _freed_bytes; } |
| 1594 | |
|
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1595 bool doHeapRegion(HeapRegion *hr) { |
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1596 // We use a claim value of zero here because all regions |
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1597 // were claimed with value 1 in the FinalCount task. |
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1598 hr->reset_gc_time_stamp(); |
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1599 if (!hr->continuesHumongous()) { |
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1600 double start = os::elapsedTime(); |
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1601 _regions_claimed++; |
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1602 hr->note_end_of_marking(); |
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1603 _max_live_bytes += hr->max_live_bytes(); |
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1604 _g1->free_region_if_empty(hr, |
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1605 &_freed_bytes, |
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1606 _local_cleanup_list, |
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1607 _old_proxy_set, |
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1608 _humongous_proxy_set, |
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1609 _hrrs_cleanup_task, |
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1610 true /* par */); |
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1611 double region_time = (os::elapsedTime() - start); |
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1612 _claimed_region_time += region_time; |
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1613 if (region_time > _max_region_time) { |
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1614 _max_region_time = region_time; |
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1615 } |
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1616 } |
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1617 return false; |
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1618 } |
| 342 | 1619 |
| 1620 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1621 size_t regions_claimed() { return _regions_claimed; } | |
| 1622 double claimed_region_time_sec() { return _claimed_region_time; } | |
| 1623 double max_region_time_sec() { return _max_region_time; } | |
| 1624 }; | |
| 1625 | |
| 1626 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1627 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1628 |
| 342 | 1629 protected: |
| 1630 G1CollectedHeap* _g1h; | |
| 1631 size_t _max_live_bytes; | |
| 1632 size_t _freed_bytes; | |
| 2152 | 1633 FreeRegionList* _cleanup_list; |
| 1634 | |
| 342 | 1635 public: |
| 1636 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1637 FreeRegionList* cleanup_list) : |
| 342 | 1638 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1639 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1640 |
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1641 void work(uint worker_id) { |
| 342 | 1642 double start = os::elapsedTime(); |
| 2173 | 1643 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 4072 | 1644 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
| 2173 | 1645 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
| 1646 HRRSCleanupTask hrrs_cleanup_task; | |
|
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1647 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
| 4072 | 1648 &old_proxy_set, |
| 2173 | 1649 &humongous_proxy_set, |
| 1650 &hrrs_cleanup_task); | |
|
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1651 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1652 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
|
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1653 _g1h->workers()->active_workers(), |
| 355 | 1654 HeapRegion::NoteEndClaimValue); |
| 342 | 1655 } else { |
| 1656 _g1h->heap_region_iterate(&g1_note_end); | |
| 1657 } | |
| 1658 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1659 | |
| 2152 | 1660 // Now update the lists |
| 1661 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
| 1662 NULL /* free_list */, | |
| 4072 | 1663 &old_proxy_set, |
| 2173 | 1664 &humongous_proxy_set, |
| 2152 | 1665 true /* par */); |
| 342 | 1666 { |
| 1667 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 1668 _max_live_bytes += g1_note_end.max_live_bytes(); | |
| 1669 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1670 |
|
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1671 // If we iterate over the global cleanup list at the end of |
|
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1672 // cleanup to do this printing we will not guarantee to only |
|
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1673 // generate output for the newly-reclaimed regions (the list |
|
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1674 // might not be empty at the beginning of cleanup; we might |
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1675 // still be working on its previous contents). So we do the |
|
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1676 // printing here, before we append the new regions to the global |
|
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1677 // cleanup list. |
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1678 |
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1679 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
|
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1680 if (hr_printer->is_active()) { |
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1681 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1682 while (iter.more_available()) { |
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1683 HeapRegion* hr = iter.get_next(); |
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1684 hr_printer->cleanup(hr); |
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1685 } |
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1686 } |
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1687 |
| 2173 | 1688 _cleanup_list->add_as_tail(&local_cleanup_list); |
| 1689 assert(local_cleanup_list.is_empty(), "post-condition"); | |
| 1690 | |
| 1691 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1692 } |
| 1693 double end = os::elapsedTime(); | |
| 1694 if (G1PrintParCleanupStats) { | |
| 1695 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
|
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1696 "claimed %u regions (tot = %8.3f ms, max = %8.3f ms).\n", |
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1697 worker_id, start, end, (end-start)*1000.0, |
| 342 | 1698 g1_note_end.regions_claimed(), |
| 1699 g1_note_end.claimed_region_time_sec()*1000.0, | |
| 1700 g1_note_end.max_region_time_sec()*1000.0); | |
| 1701 } | |
| 1702 } | |
| 1703 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1704 size_t freed_bytes() { return _freed_bytes; } | |
| 1705 }; | |
| 1706 | |
| 1707 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 1708 protected: | |
| 1709 G1RemSet* _g1rs; | |
| 1710 BitMap* _region_bm; | |
| 1711 BitMap* _card_bm; | |
| 1712 public: | |
| 1713 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 1714 BitMap* region_bm, BitMap* card_bm) : | |
| 1715 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
| 1716 _region_bm(region_bm), _card_bm(card_bm) | |
| 1717 {} | |
| 1718 | |
|
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1719 void work(uint worker_id) { |
|
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1720 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1721 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 1722 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 1723 } else { |
| 1724 _g1rs->scrub(_region_bm, _card_bm); | |
| 1725 } | |
| 1726 } | |
| 1727 | |
| 1728 }; | |
| 1729 | |
| 1730 void ConcurrentMark::cleanup() { | |
| 1731 // world is stopped at this checkpoint | |
| 1732 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1733 "world should be stopped"); | |
| 1734 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1735 | |
| 1736 // If a full collection has happened, we shouldn't do this. | |
| 1737 if (has_aborted()) { | |
| 1738 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1739 return; | |
| 1740 } | |
| 1741 | |
| 4072 | 1742 HRSPhaseSetter x(HRSPhaseCleanup); |
| 2152 | 1743 g1h->verify_region_sets_optional(); |
| 1744 | |
|
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1745 if (VerifyDuringGC) { |
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1746 HandleMark hm; // handle scope |
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1747 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1748 Universe::heap()->prepare_for_verify(); |
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1749 Universe::verify(/* allow dirty */ true, |
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1750 /* silent */ false, |
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1751 /* option */ VerifyOption_G1UsePrevMarking); |
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1752 } |
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1753 |
| 342 | 1754 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 1755 g1p->record_concurrent_mark_cleanup_start(); | |
| 1756 | |
| 1757 double start = os::elapsedTime(); | |
| 1758 | |
| 2173 | 1759 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 1760 | |
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1761 uint n_workers; |
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1762 |
| 342 | 1763 // Do counting once more with the world stopped for good measure. |
| 1764 G1ParFinalCountTask g1_par_count_task(g1h, nextMarkBitMap(), | |
| 1765 &_region_bm, &_card_bm); | |
|
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1766 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 355 | 1767 assert(g1h->check_heap_region_claim_values( |
| 1768 HeapRegion::InitialClaimValue), | |
| 1769 "sanity check"); | |
| 1770 | |
| 4711 | 1771 g1h->set_par_threads(); |
| 1772 n_workers = g1h->n_par_threads(); | |
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1773 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 1774 "Should not have been reset"); |
| 342 | 1775 g1h->workers()->run_task(&g1_par_count_task); |
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1776 // Done with the parallel phase so reset to 0. |
| 342 | 1777 g1h->set_par_threads(0); |
| 355 | 1778 |
| 1779 assert(g1h->check_heap_region_claim_values( | |
| 1780 HeapRegion::FinalCountClaimValue), | |
| 1781 "sanity check"); | |
| 342 | 1782 } else { |
| 4711 | 1783 n_workers = 1; |
| 342 | 1784 g1_par_count_task.work(0); |
| 1785 } | |
| 1786 | |
| 1787 size_t known_garbage_bytes = | |
| 1788 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
| 1789 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
| 1790 | |
| 1791 size_t start_used_bytes = g1h->used(); | |
| 1792 _at_least_one_mark_complete = true; | |
| 1793 g1h->set_marking_complete(); | |
| 1794 | |
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1795 ergo_verbose4(ErgoConcCycles, |
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1796 "finish cleanup", |
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1797 ergo_format_byte("occupancy") |
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1798 ergo_format_byte("capacity") |
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1799 ergo_format_byte_perc("known garbage"), |
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1800 start_used_bytes, g1h->capacity(), |
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1801 known_garbage_bytes, |
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1802 ((double) known_garbage_bytes / (double) g1h->capacity()) * 100.0); |
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1803 |
| 342 | 1804 double count_end = os::elapsedTime(); |
| 1805 double this_final_counting_time = (count_end - start); | |
| 1806 if (G1PrintParCleanupStats) { | |
| 1807 gclog_or_tty->print_cr("Cleanup:"); | |
| 1808 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
| 1809 this_final_counting_time*1000.0); | |
| 1810 } | |
| 1811 _total_counting_time += this_final_counting_time; | |
| 1812 | |
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1813 if (G1PrintRegionLivenessInfo) { |
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1814 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1815 _g1h->heap_region_iterate(&cl); |
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1816 } |
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1817 |
| 342 | 1818 // Install newly created mark bitMap as "prev". |
| 1819 swapMarkBitMaps(); | |
| 1820 | |
| 1821 g1h->reset_gc_time_stamp(); | |
| 1822 | |
| 1823 // Note end of marking in all heap regions. | |
| 1824 double note_end_start = os::elapsedTime(); | |
| 2152 | 1825 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
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1826 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1827 g1h->set_par_threads((int)n_workers); |
| 342 | 1828 g1h->workers()->run_task(&g1_par_note_end_task); |
| 1829 g1h->set_par_threads(0); | |
| 355 | 1830 |
| 1831 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 1832 "sanity check"); | |
| 342 | 1833 } else { |
| 1834 g1_par_note_end_task.work(0); | |
| 1835 } | |
| 2152 | 1836 |
| 1837 if (!cleanup_list_is_empty()) { | |
| 1838 // The cleanup list is not empty, so we'll have to process it | |
| 1839 // concurrently. Notify anyone else that might be wanting free | |
| 1840 // regions that there will be more free regions coming soon. | |
| 1841 g1h->set_free_regions_coming(); | |
| 1842 } | |
| 342 | 1843 double note_end_end = os::elapsedTime(); |
| 1844 if (G1PrintParCleanupStats) { | |
| 1845 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
| 1846 (note_end_end - note_end_start)*1000.0); | |
| 1847 } | |
| 1848 | |
| 1849 // call below, since it affects the metric by which we sort the heap | |
| 1850 // regions. | |
| 1851 if (G1ScrubRemSets) { | |
| 1852 double rs_scrub_start = os::elapsedTime(); | |
| 1853 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
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1854 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1855 g1h->set_par_threads((int)n_workers); |
| 342 | 1856 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 1857 g1h->set_par_threads(0); | |
| 355 | 1858 |
| 1859 assert(g1h->check_heap_region_claim_values( | |
| 1860 HeapRegion::ScrubRemSetClaimValue), | |
| 1861 "sanity check"); | |
| 342 | 1862 } else { |
| 1863 g1_par_scrub_rs_task.work(0); | |
| 1864 } | |
| 1865 | |
| 1866 double rs_scrub_end = os::elapsedTime(); | |
| 1867 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 1868 _total_rs_scrub_time += this_rs_scrub_time; | |
| 1869 } | |
| 1870 | |
| 1871 // this will also free any regions totally full of garbage objects, | |
| 1872 // and sort the regions. | |
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1873 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 1874 |
| 1875 // Statistics. | |
| 1876 double end = os::elapsedTime(); | |
| 1877 _cleanup_times.add((end - start) * 1000.0); | |
| 1878 | |
| 1879 if (PrintGC || PrintGCDetails) { | |
| 1880 g1h->print_size_transition(gclog_or_tty, | |
| 1881 start_used_bytes, | |
| 1882 g1h->used(), | |
| 1883 g1h->capacity()); | |
| 1884 } | |
| 1885 | |
| 1886 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
| 1887 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
| 1888 | |
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1889 // Clean up will have freed any regions completely full of garbage. |
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1890 // Update the soft reference policy with the new heap occupancy. |
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1891 Universe::update_heap_info_at_gc(); |
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1892 |
| 342 | 1893 // We need to make this be a "collection" so any collection pause that |
| 1894 // races with it goes around and waits for completeCleanup to finish. | |
| 1895 g1h->increment_total_collections(); | |
| 1896 | |
| 751 | 1897 if (VerifyDuringGC) { |
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1898 HandleMark hm; // handle scope |
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1899 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1900 Universe::heap()->prepare_for_verify(); |
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1901 Universe::verify(/* allow dirty */ true, |
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1902 /* silent */ false, |
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1903 /* option */ VerifyOption_G1UsePrevMarking); |
| 342 | 1904 } |
| 2152 | 1905 |
| 1906 g1h->verify_region_sets_optional(); | |
| 342 | 1907 } |
| 1908 | |
| 1909 void ConcurrentMark::completeCleanup() { | |
| 1910 if (has_aborted()) return; | |
| 1911 | |
| 2152 | 1912 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1913 | |
| 1914 _cleanup_list.verify_optional(); | |
| 2361 | 1915 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 1916 |
| 1917 if (G1ConcRegionFreeingVerbose) { | |
| 1918 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
| 1919 "cleanup list has "SIZE_FORMAT" entries", | |
| 1920 _cleanup_list.length()); | |
| 1921 } | |
| 1922 | |
| 1923 // Noone else should be accessing the _cleanup_list at this point, | |
| 1924 // so it's not necessary to take any locks | |
| 1925 while (!_cleanup_list.is_empty()) { | |
| 1926 HeapRegion* hr = _cleanup_list.remove_head(); | |
| 1927 assert(hr != NULL, "the list was not empty"); | |
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1928 hr->par_clear(); |
| 2361 | 1929 tmp_free_list.add_as_tail(hr); |
| 2152 | 1930 |
| 1931 // Instead of adding one region at a time to the secondary_free_list, | |
| 1932 // we accumulate them in the local list and move them a few at a | |
| 1933 // time. This also cuts down on the number of notify_all() calls | |
| 1934 // we do during this process. We'll also append the local list when | |
| 1935 // _cleanup_list is empty (which means we just removed the last | |
| 1936 // region from the _cleanup_list). | |
| 2361 | 1937 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 1938 _cleanup_list.is_empty()) { |
| 1939 if (G1ConcRegionFreeingVerbose) { | |
| 1940 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
| 1941 "appending "SIZE_FORMAT" entries to the " | |
| 1942 "secondary_free_list, clean list still has " | |
| 1943 SIZE_FORMAT" entries", | |
| 2361 | 1944 tmp_free_list.length(), |
| 2152 | 1945 _cleanup_list.length()); |
| 342 | 1946 } |
| 2152 | 1947 |
| 1948 { | |
| 1949 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 2361 | 1950 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
| 2152 | 1951 SecondaryFreeList_lock->notify_all(); |
| 1952 } | |
| 1953 | |
| 1954 if (G1StressConcRegionFreeing) { | |
| 1955 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 1956 os::sleep(Thread::current(), (jlong) 1, false); | |
| 1957 } | |
| 1958 } | |
| 342 | 1959 } |
| 1960 } | |
| 2361 | 1961 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 1962 } |
| 1963 | |
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1964 // Support closures for reference procssing in G1 |
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1965 |
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1966 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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1967 HeapWord* addr = (HeapWord*)obj; |
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1968 return addr != NULL && |
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1969 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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1970 } |
| 342 | 1971 |
| 1972 class G1CMKeepAliveClosure: public OopClosure { | |
| 1973 G1CollectedHeap* _g1; | |
| 1974 ConcurrentMark* _cm; | |
| 1975 CMBitMap* _bitMap; | |
| 1976 public: | |
| 1977 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm, | |
| 1978 CMBitMap* bitMap) : | |
| 1979 _g1(g1), _cm(cm), | |
| 1980 _bitMap(bitMap) {} | |
| 1981 | |
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1982 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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1983 virtual void do_oop( oop* p) { do_oop_work(p); } |
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1984 |
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1985 template <class T> void do_oop_work(T* p) { |
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1986 oop obj = oopDesc::load_decode_heap_oop(p); |
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1987 HeapWord* addr = (HeapWord*)obj; |
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1988 |
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1989 if (_cm->verbose_high()) { |
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1990 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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1991 "*"PTR_FORMAT" = "PTR_FORMAT, |
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1992 p, (void*) obj); |
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1993 } |
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1994 |
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1995 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
| 342 | 1996 _bitMap->mark(addr); |
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1997 _cm->mark_stack_push(obj); |
| 342 | 1998 } |
| 1999 } | |
| 2000 }; | |
| 2001 | |
| 2002 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
| 2003 CMMarkStack* _markStack; | |
| 2004 CMBitMap* _bitMap; | |
| 2005 G1CMKeepAliveClosure* _oopClosure; | |
| 2006 public: | |
| 2007 G1CMDrainMarkingStackClosure(CMBitMap* bitMap, CMMarkStack* markStack, | |
| 2008 G1CMKeepAliveClosure* oopClosure) : | |
| 2009 _bitMap(bitMap), | |
| 2010 _markStack(markStack), | |
| 2011 _oopClosure(oopClosure) | |
| 2012 {} | |
| 2013 | |
| 2014 void do_void() { | |
| 2015 _markStack->drain((OopClosure*)_oopClosure, _bitMap, false); | |
| 2016 } | |
| 2017 }; | |
| 2018 | |
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2019 // 'Keep Alive' closure used by parallel reference processing. |
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2020 // An instance of this closure is used in the parallel reference processing |
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2021 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2022 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2023 // placed on to discovered ref lists once so we can mark and push with no |
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2024 // need to check whether the object has already been marked. Using the |
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2025 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2026 // operating on the global mark stack. This means that an individual |
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2027 // worker would be doing lock-free pushes while it processes its own |
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2028 // discovered ref list followed by drain call. If the discovered ref lists |
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2029 // are unbalanced then this could cause interference with the other |
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2030 // workers. Using a CMTask (and its embedded local data structures) |
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2031 // avoids that potential interference. |
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2032 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2033 ConcurrentMark* _cm; |
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2034 CMTask* _task; |
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2035 int _ref_counter_limit; |
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2036 int _ref_counter; |
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2037 public: |
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2038 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2039 _cm(cm), _task(task), |
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2040 _ref_counter_limit(G1RefProcDrainInterval) { |
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2041 assert(_ref_counter_limit > 0, "sanity"); |
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2042 _ref_counter = _ref_counter_limit; |
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2043 } |
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2044 |
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2045 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2046 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2047 |
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2048 template <class T> void do_oop_work(T* p) { |
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2049 if (!_cm->has_overflown()) { |
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2050 oop obj = oopDesc::load_decode_heap_oop(p); |
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2051 if (_cm->verbose_high()) { |
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2052 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2053 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2054 _task->task_id(), p, (void*) obj); |
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2055 } |
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2056 |
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2057 _task->deal_with_reference(obj); |
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2058 _ref_counter--; |
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2059 |
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2060 if (_ref_counter == 0) { |
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2061 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2062 // reachable from them on to the local stack (and possibly the global stack). |
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2063 // Call do_marking_step() to process these entries. We call the routine in a |
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2064 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2065 // with the entries that we've pushed as a result of the deal_with_reference |
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2066 // calls above) or we overflow. |
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2067 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2068 // while there may still be some work to do. (See the comment at the |
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2069 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2070 // is reaching the specified time target.) It is only when |
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2071 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2072 // that the marking has completed. |
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2073 do { |
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2074 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2075 _task->do_marking_step(mark_step_duration_ms, |
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|
2076 false /* do_stealing */, |
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|
2077 false /* do_termination */); |
|
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2078 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2079 _ref_counter = _ref_counter_limit; |
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|
2080 } |
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|
2081 } else { |
|
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|
2082 if (_cm->verbose_high()) { |
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2083 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
|
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2084 } |
|
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2085 } |
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|
2086 } |
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|
2087 }; |
|
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|
2088 |
|
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|
2089 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
|
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|
2090 ConcurrentMark* _cm; |
|
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|
2091 CMTask* _task; |
|
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|
2092 public: |
|
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|
2093 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
|
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|
2094 _cm(cm), _task(task) |
|
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|
2095 {} |
|
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|
2096 |
|
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|
2097 void do_void() { |
|
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|
2098 do { |
|
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|
2099 if (_cm->verbose_high()) { |
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|
2100 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
|
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|
2101 _task->task_id()); |
|
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|
2102 } |
|
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|
2103 |
|
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|
2104 // We call CMTask::do_marking_step() to completely drain the local and |
|
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|
2105 // global marking stacks. The routine is called in a loop, which we'll |
|
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|
2106 // exit if there's nothing more to do (i.e. we'completely drained the |
|
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|
2107 // entries that were pushed as a result of applying the |
|
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|
2108 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
|
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|
2109 // lists above) or we overflow the global marking stack. |
|
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|
2110 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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|
2111 // while there may still be some work to do. (See the comment at the |
|
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|
2112 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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|
2113 // is reaching the specified time target.) It is only when |
|
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|
2114 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2115 // that the marking has completed. |
|
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|
2116 |
|
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|
2117 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2118 true /* do_stealing */, |
|
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|
2119 true /* do_termination */); |
|
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|
2120 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2121 } |
|
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|
2122 }; |
|
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|
2123 |
|
3979
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|
2124 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
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|
2125 // reference processing at the end of G1 concurrent marking |
|
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|
2126 |
|
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|
2127 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
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|
2128 private: |
|
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|
2129 G1CollectedHeap* _g1h; |
|
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|
2130 ConcurrentMark* _cm; |
|
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|
2131 WorkGang* _workers; |
|
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|
2132 int _active_workers; |
|
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|
2133 |
|
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|
2134 public: |
|
3979
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|
2135 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
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|
2136 ConcurrentMark* cm, |
|
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|
2137 WorkGang* workers, |
|
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|
2138 int n_workers) : |
|
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|
2139 _g1h(g1h), _cm(cm), |
|
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|
2140 _workers(workers), _active_workers(n_workers) { } |
|
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|
2141 |
|
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|
2142 // Executes the given task using concurrent marking worker threads. |
|
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|
2143 virtual void execute(ProcessTask& task); |
|
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|
2144 virtual void execute(EnqueueTask& task); |
|
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|
2145 }; |
|
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|
2146 |
|
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|
2147 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
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|
2148 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
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|
2149 ProcessTask& _proc_task; |
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2150 G1CollectedHeap* _g1h; |
|
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2151 ConcurrentMark* _cm; |
|
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2152 |
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|
2153 public: |
|
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2154 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
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2155 G1CollectedHeap* g1h, |
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2156 ConcurrentMark* cm) : |
|
2174
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2157 AbstractGangTask("Process reference objects in parallel"), |
|
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2158 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
|
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2159 |
|
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2160 virtual void work(uint worker_id) { |
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2161 CMTask* marking_task = _cm->task(worker_id); |
|
2174
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2162 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
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2163 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
|
2174
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2164 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2165 |
|
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2166 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
2174
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2167 } |
|
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2168 }; |
|
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2169 |
|
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2170 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
2174
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2171 assert(_workers != NULL, "Need parallel worker threads."); |
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2172 |
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2173 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
2174
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2174 |
|
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2175 // We need to reset the phase for each task execution so that |
|
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2176 // the termination protocol of CMTask::do_marking_step works. |
|
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2177 _cm->set_phase(_active_workers, false /* concurrent */); |
|
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2178 _g1h->set_par_threads(_active_workers); |
|
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2179 _workers->run_task(&proc_task_proxy); |
|
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2180 _g1h->set_par_threads(0); |
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2181 } |
|
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2182 |
|
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2183 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
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2184 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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2185 EnqueueTask& _enq_task; |
|
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2186 |
|
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2187 public: |
|
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2188 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
2174
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2189 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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2190 _enq_task(enq_task) { } |
|
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2191 |
|
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|
2192 virtual void work(uint worker_id) { |
|
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|
2193 _enq_task.work(worker_id); |
|
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2194 } |
|
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|
2195 }; |
|
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|
2196 |
|
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|
2197 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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2198 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
2199 |
|
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|
2200 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
2201 |
|
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|
2202 _g1h->set_par_threads(_active_workers); |
|
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2203 _workers->run_task(&enq_task_proxy); |
|
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|
2204 _g1h->set_par_threads(0); |
|
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|
2205 } |
|
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|
2206 |
| 342 | 2207 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
| 2208 ResourceMark rm; | |
| 2209 HandleMark hm; | |
|
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2210 |
|
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|
2211 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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|
2212 |
|
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|
2213 // Is alive closure. |
|
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|
2214 G1CMIsAliveClosure g1_is_alive(g1h); |
|
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|
2215 |
|
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|
2216 // Inner scope to exclude the cleaning of the string and symbol |
|
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|
2217 // tables from the displayed time. |
|
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|
2218 { |
|
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|
2219 bool verbose = PrintGC && PrintGCDetails; |
|
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|
2220 if (verbose) { |
|
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|
2221 gclog_or_tty->put(' '); |
|
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|
2222 } |
|
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|
2223 TraceTime t("GC ref-proc", verbose, false, gclog_or_tty); |
|
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|
2224 |
|
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|
2225 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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|
2226 |
|
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|
2227 // See the comment in G1CollectedHeap::ref_processing_init() |
|
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|
2228 // about how reference processing currently works in G1. |
|
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|
2229 |
|
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|
2230 // Process weak references. |
|
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|
2231 rp->setup_policy(clear_all_soft_refs); |
|
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|
2232 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
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|
2233 |
|
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|
2234 G1CMKeepAliveClosure g1_keep_alive(g1h, this, nextMarkBitMap()); |
|
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|
2235 G1CMDrainMarkingStackClosure |
|
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|
2236 g1_drain_mark_stack(nextMarkBitMap(), &_markStack, &g1_keep_alive); |
|
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|
2237 |
|
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|
2238 // We use the work gang from the G1CollectedHeap and we utilize all |
|
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|
2239 // the worker threads. |
|
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|
2240 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
|
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|
2241 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
|
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|
2242 |
|
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|
2243 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
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|
2244 g1h->workers(), active_workers); |
|
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|
2245 |
|
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|
2246 if (rp->processing_is_mt()) { |
|
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|
2247 // Set the degree of MT here. If the discovery is done MT, there |
|
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|
2248 // may have been a different number of threads doing the discovery |
|
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|
2249 // and a different number of discovered lists may have Ref objects. |
|
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|
2250 // That is OK as long as the Reference lists are balanced (see |
|
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|
2251 // balance_all_queues() and balance_queues()). |
|
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|
2252 rp->set_active_mt_degree(active_workers); |
|
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|
2253 |
|
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|
2254 rp->process_discovered_references(&g1_is_alive, |
|
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|
2255 &g1_keep_alive, |
|
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|
2256 &g1_drain_mark_stack, |
|
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|
2257 &par_task_executor); |
|
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|
2258 |
|
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|
2259 // The work routines of the parallel keep_alive and drain_marking_stack |
|
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|
2260 // will set the has_overflown flag if we overflow the global marking |
|
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|
2261 // stack. |
|
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|
2262 } else { |
|
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|
2263 rp->process_discovered_references(&g1_is_alive, |
|
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|
2264 &g1_keep_alive, |
|
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|
2265 &g1_drain_mark_stack, |
|
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|
2266 NULL); |
|
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|
2267 } |
|
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|
2268 |
|
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|
2269 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
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|
2270 "mark stack should be empty (unless it overflowed)"); |
|
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|
2271 if (_markStack.overflow()) { |
|
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|
2272 // Should have been done already when we tried to push an |
|
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|
2273 // entry on to the global mark stack. But let's do it again. |
|
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|
2274 set_has_overflown(); |
|
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|
2275 } |
|
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|
2276 |
|
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|
2277 if (rp->processing_is_mt()) { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2278 assert(rp->num_q() == active_workers, "why not"); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2279 rp->enqueue_discovered_references(&par_task_executor); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2280 } else { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2281 rp->enqueue_discovered_references(); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2282 } |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2283 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2284 rp->verify_no_references_recorded(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2285 assert(!rp->discovery_enabled(), "Post condition"); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2286 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2287 |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2288 // Now clean up stale oops in StringTable |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2289 StringTable::unlink(&g1_is_alive); |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2290 // Clean up unreferenced symbols in symbol table. |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2291 SymbolTable::unlink(); |
| 342 | 2292 } |
| 2293 | |
| 2294 void ConcurrentMark::swapMarkBitMaps() { | |
| 2295 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2296 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2297 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2298 } | |
| 2299 | |
| 2300 class CMRemarkTask: public AbstractGangTask { | |
| 2301 private: | |
| 2302 ConcurrentMark *_cm; | |
| 2303 | |
| 2304 public: | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2305 void work(uint worker_id) { |
| 342 | 2306 // Since all available tasks are actually started, we should |
| 2307 // only proceed if we're supposed to be actived. | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2308 if (worker_id < _cm->active_tasks()) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2309 CMTask* task = _cm->task(worker_id); |
| 342 | 2310 task->record_start_time(); |
| 2311 do { | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2312 task->do_marking_step(1000000000.0 /* something very large */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2313 true /* do_stealing */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2314 true /* do_termination */); |
| 342 | 2315 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2316 // If we overflow, then we do not want to restart. We instead | |
| 2317 // want to abort remark and do concurrent marking again. | |
| 2318 task->record_end_time(); | |
| 2319 } | |
| 2320 } | |
| 2321 | |
| 4711 | 2322 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2323 AbstractGangTask("Par Remark"), _cm(cm) { |
| 4711 | 2324 _cm->terminator()->reset_for_reuse(active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2325 } |
| 342 | 2326 }; |
| 2327 | |
| 2328 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2329 ResourceMark rm; | |
| 2330 HandleMark hm; | |
| 2331 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2332 | |
| 2333 g1h->ensure_parsability(false); | |
| 2334 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2335 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2336 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2337 // 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
|
2338 uint active_workers = g1h->workers()->active_workers(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2339 if (active_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2340 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
|
2341 active_workers = (uint) ParallelGCThreads; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2342 g1h->workers()->set_active_workers(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2343 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2344 set_phase(active_workers, false /* concurrent */); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2345 // Leave _parallel_marking_threads at it's |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2346 // value originally calculated in the ConcurrentMark |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2347 // constructor and pass values of the active workers |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2348 // through the gang in the task. |
| 342 | 2349 |
| 4711 | 2350 CMRemarkTask remarkTask(this, active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2351 g1h->set_par_threads(active_workers); |
| 342 | 2352 g1h->workers()->run_task(&remarkTask); |
| 2353 g1h->set_par_threads(0); | |
| 2354 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2355 G1CollectedHeap::StrongRootsScope srs(g1h); |
| 342 | 2356 // 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
|
2357 uint active_workers = 1; |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2358 set_phase(active_workers, false /* concurrent */); |
| 342 | 2359 |
| 4711 | 2360 CMRemarkTask remarkTask(this, active_workers); |
| 342 | 2361 // We will start all available threads, even if we decide that the |
| 2362 // active_workers will be fewer. The extra ones will just bail out | |
| 2363 // immediately. | |
| 2364 remarkTask.work(0); | |
| 2365 } | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2366 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2367 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2368 |
| 2369 print_stats(); | |
| 2370 | |
| 2371 #if VERIFY_OBJS_PROCESSED | |
| 2372 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
| 2373 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
| 2374 _scan_obj_cl.objs_processed, | |
| 2375 ThreadLocalObjQueue::objs_enqueued); | |
| 2376 guarantee(_scan_obj_cl.objs_processed == | |
| 2377 ThreadLocalObjQueue::objs_enqueued, | |
| 2378 "Different number of objs processed and enqueued."); | |
| 2379 } | |
| 2380 #endif | |
| 2381 } | |
| 2382 | |
| 1044 | 2383 #ifndef PRODUCT |
| 2384 | |
| 1388 | 2385 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2386 private: |
| 2387 G1CollectedHeap* _g1h; | |
| 2388 outputStream* _out; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2389 VerifyOption _vo; |
| 1388 | 2390 bool _all; |
| 342 | 2391 |
| 2392 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2393 PrintReachableOopClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2394 VerifyOption vo, |
| 1388 | 2395 bool all) : |
| 1044 | 2396 _g1h(G1CollectedHeap::heap()), |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2397 _out(out), _vo(vo), _all(all) { } |
| 342 | 2398 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2399 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
|
2400 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
|
2401 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2402 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
|
2403 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2404 const char* str = NULL; |
| 2405 const char* str2 = ""; | |
| 2406 | |
| 1388 | 2407 if (obj == NULL) { |
| 2408 str = ""; | |
| 2409 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2410 str = " O"; | |
| 2411 } else { | |
| 342 | 2412 HeapRegion* hr = _g1h->heap_region_containing(obj); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2413 guarantee(hr != NULL, "invariant"); |
| 1044 | 2414 bool over_tams = false; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2415 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2416 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2417 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2418 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2419 over_tams = hr->obj_allocated_since_prev_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2420 marked = _g1h->isMarkedPrev(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2421 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2422 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2423 over_tams = hr->obj_allocated_since_next_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2424 marked = _g1h->isMarkedNext(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2425 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2426 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2427 marked = obj->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2428 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2429 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2430 ShouldNotReachHere(); |
| 1044 | 2431 } |
| 2432 | |
| 2433 if (over_tams) { | |
| 1388 | 2434 str = " >"; |
| 2435 if (marked) { | |
| 342 | 2436 str2 = " AND MARKED"; |
| 1044 | 2437 } |
| 1388 | 2438 } else if (marked) { |
| 2439 str = " M"; | |
| 1044 | 2440 } else { |
| 1388 | 2441 str = " NOT"; |
| 1044 | 2442 } |
| 342 | 2443 } |
| 2444 | |
| 1388 | 2445 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
| 342 | 2446 p, (void*) obj, str, str2); |
| 2447 } | |
| 2448 }; | |
| 2449 | |
| 1388 | 2450 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2451 private: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2452 G1CollectedHeap* _g1h; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2453 outputStream* _out; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2454 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2455 bool _all; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2456 HeapRegion* _hr; |
| 342 | 2457 |
| 2458 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2459 PrintReachableObjectClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2460 VerifyOption vo, |
| 1388 | 2461 bool all, |
| 2462 HeapRegion* hr) : | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2463 _g1h(G1CollectedHeap::heap()), |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2464 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2465 |
| 2466 void do_object(oop o) { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2467 bool over_tams = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2468 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2469 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2470 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2471 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2472 over_tams = _hr->obj_allocated_since_prev_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2473 marked = _g1h->isMarkedPrev(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2474 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2475 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2476 over_tams = _hr->obj_allocated_since_next_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2477 marked = _g1h->isMarkedNext(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2478 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2479 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2480 marked = o->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2481 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2482 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2483 ShouldNotReachHere(); |
| 1388 | 2484 } |
| 2485 bool print_it = _all || over_tams || marked; | |
| 2486 | |
| 2487 if (print_it) { | |
| 2488 _out->print_cr(" "PTR_FORMAT"%s", | |
| 2489 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
|
3772
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|
2490 PrintReachableOopClosure oopCl(_out, _vo, _all); |
| 1388 | 2491 o->oop_iterate(&oopCl); |
| 2492 } | |
| 342 | 2493 } |
| 2494 }; | |
| 2495 | |
| 1388 | 2496 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2497 private: |
| 2498 outputStream* _out; | |
|
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|
2499 VerifyOption _vo; |
| 1388 | 2500 bool _all; |
| 342 | 2501 |
| 2502 public: | |
| 2503 bool doHeapRegion(HeapRegion* hr) { | |
| 2504 HeapWord* b = hr->bottom(); | |
| 2505 HeapWord* e = hr->end(); | |
| 2506 HeapWord* t = hr->top(); | |
| 1044 | 2507 HeapWord* p = NULL; |
|
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|
2508 |
|
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|
2509 switch (_vo) { |
|
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2510 case VerifyOption_G1UsePrevMarking: |
|
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2511 p = hr->prev_top_at_mark_start(); |
|
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|
2512 break; |
|
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|
2513 case VerifyOption_G1UseNextMarking: |
|
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2514 p = hr->next_top_at_mark_start(); |
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2515 break; |
|
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|
2516 case VerifyOption_G1UseMarkWord: |
|
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2517 // When we are verifying marking using the mark word |
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2518 // TAMS has no relevance. |
|
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|
2519 assert(p == NULL, "post-condition"); |
|
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|
2520 break; |
|
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|
2521 default: |
|
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|
2522 ShouldNotReachHere(); |
| 1044 | 2523 } |
| 342 | 2524 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
| 1044 | 2525 "TAMS: "PTR_FORMAT, b, e, t, p); |
| 1388 | 2526 _out->cr(); |
| 2527 | |
| 2528 HeapWord* from = b; | |
| 2529 HeapWord* to = t; | |
| 2530 | |
| 2531 if (to > from) { | |
| 2532 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
| 2533 _out->cr(); | |
|
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2534 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2535 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2536 _out->cr(); | |
| 2537 } | |
| 342 | 2538 |
| 2539 return false; | |
| 2540 } | |
| 2541 | |
|
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|
2542 PrintReachableRegionClosure(outputStream* out, |
|
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|
2543 VerifyOption vo, |
| 1388 | 2544 bool all) : |
|
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2545 _out(out), _vo(vo), _all(all) { } |
| 342 | 2546 }; |
| 2547 | |
|
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2548 static const char* verify_option_to_tams(VerifyOption vo) { |
|
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|
2549 switch (vo) { |
|
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|
2550 case VerifyOption_G1UsePrevMarking: |
|
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|
2551 return "PTAMS"; |
|
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|
2552 case VerifyOption_G1UseNextMarking: |
|
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|
2553 return "NTAMS"; |
|
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|
2554 default: |
|
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|
2555 return "NONE"; |
|
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|
2556 } |
|
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|
2557 } |
|
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|
2558 |
| 1388 | 2559 void ConcurrentMark::print_reachable(const char* str, |
|
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|
2560 VerifyOption vo, |
| 1388 | 2561 bool all) { |
| 2562 gclog_or_tty->cr(); | |
| 2563 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 2564 |
| 2565 if (G1PrintReachableBaseFile == NULL) { | |
| 2566 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 2567 return; | |
| 2568 } | |
| 2569 | |
| 2570 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 2571 (JVM_MAXPATHLEN - 1)) { | |
| 2572 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 2573 return; | |
| 2574 } | |
| 2575 | |
| 2576 char file_name[JVM_MAXPATHLEN]; | |
| 2577 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 2578 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 2579 | |
| 2580 fileStream fout(file_name); | |
| 2581 if (!fout.is_open()) { | |
| 2582 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 2583 return; | |
| 2584 } | |
| 2585 | |
| 2586 outputStream* out = &fout; | |
|
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|
2587 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
| 1044 | 2588 out->cr(); |
| 2589 | |
| 1388 | 2590 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2591 out->cr(); |
|
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|
2592 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 2593 _g1h->heap_region_iterate(&rcl); |
| 1044 | 2594 out->cr(); |
| 2595 | |
| 2596 gclog_or_tty->print_cr(" done"); | |
| 1388 | 2597 gclog_or_tty->flush(); |
| 342 | 2598 } |
| 2599 | |
| 1044 | 2600 #endif // PRODUCT |
| 2601 | |
| 342 | 2602 // This note is for drainAllSATBBuffers and the code in between. |
| 2603 // In the future we could reuse a task to do this work during an | |
| 2604 // evacuation pause (since now tasks are not active and can be claimed | |
| 2605 // during an evacuation pause). This was a late change to the code and | |
| 2606 // is currently not being taken advantage of. | |
| 2607 | |
| 2608 class CMGlobalObjectClosure : public ObjectClosure { | |
| 2609 private: | |
| 2610 ConcurrentMark* _cm; | |
| 2611 | |
| 2612 public: | |
| 2613 void do_object(oop obj) { | |
| 2614 _cm->deal_with_reference(obj); | |
| 2615 } | |
| 2616 | |
| 2617 CMGlobalObjectClosure(ConcurrentMark* cm) : _cm(cm) { } | |
| 2618 }; | |
| 2619 | |
| 2620 void ConcurrentMark::deal_with_reference(oop obj) { | |
| 3771 | 2621 if (verbose_high()) { |
| 342 | 2622 gclog_or_tty->print_cr("[global] we're dealing with reference "PTR_FORMAT, |
| 2623 (void*) obj); | |
| 3771 | 2624 } |
| 342 | 2625 |
| 2626 HeapWord* objAddr = (HeapWord*) obj; | |
|
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|
2627 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
| 342 | 2628 if (_g1h->is_in_g1_reserved(objAddr)) { |
| 3771 | 2629 assert(obj != NULL, "null check is implicit"); |
| 2630 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
| 2631 // Only get the containing region if the object is not marked on the | |
| 2632 // bitmap (otherwise, it's a waste of time since we won't do | |
| 2633 // anything with it). | |
| 2634 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
| 2635 if (!hr->obj_allocated_since_next_marking(obj)) { | |
| 2636 if (verbose_high()) { | |
| 2637 gclog_or_tty->print_cr("[global] "PTR_FORMAT" is not considered " | |
| 2638 "marked", (void*) obj); | |
| 2639 } | |
| 2640 | |
| 2641 // we need to mark it first | |
| 2642 if (_nextMarkBitMap->parMark(objAddr)) { | |
| 2643 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 2644 // CAS done in parMark(objAddr) above | |
| 2645 HeapWord* finger = _finger; | |
| 2646 if (objAddr < finger) { | |
| 2647 if (verbose_high()) { | |
| 2648 gclog_or_tty->print_cr("[global] below the global finger " | |
| 2649 "("PTR_FORMAT"), pushing it", finger); | |
| 2650 } | |
| 2651 if (!mark_stack_push(obj)) { | |
| 2652 if (verbose_low()) { | |
| 2653 gclog_or_tty->print_cr("[global] global stack overflow during " | |
| 2654 "deal_with_reference"); | |
| 2655 } | |
| 2656 } | |
| 342 | 2657 } |
| 2658 } | |
| 2659 } | |
| 2660 } | |
| 2661 } | |
| 2662 } | |
| 2663 | |
| 2664 void ConcurrentMark::drainAllSATBBuffers() { | |
|
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|
2665 guarantee(false, "drainAllSATBBuffers(): don't call this any more"); |
|
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|
2666 |
| 342 | 2667 CMGlobalObjectClosure oc(this); |
| 2668 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 2669 satb_mq_set.set_closure(&oc); | |
| 2670 | |
| 2671 while (satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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|
2672 if (verbose_medium()) { |
| 342 | 2673 gclog_or_tty->print_cr("[global] processed an SATB buffer"); |
|
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|
2674 } |
| 342 | 2675 } |
| 2676 | |
| 2677 // no need to check whether we should do this, as this is only | |
| 2678 // called during an evacuation pause | |
| 2679 satb_mq_set.iterate_closure_all_threads(); | |
| 2680 | |
| 2681 satb_mq_set.set_closure(NULL); | |
|
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|
2682 assert(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2683 } |
| 2684 | |
| 2685 void ConcurrentMark::clear(oop p) { | |
| 2686 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 2687 HeapWord* addr = (HeapWord*)p; | |
| 2688 assert(addr >= _nextMarkBitMap->startWord() || | |
| 2689 addr < _nextMarkBitMap->endWord(), "in a region"); | |
| 2690 | |
| 2691 _nextMarkBitMap->clear(addr); | |
| 2692 } | |
| 2693 | |
|
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|
2694 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 2695 // Note we are overriding the read-only view of the prev map here, via |
| 2696 // the cast. | |
| 2697 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
|
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|
2698 } |
|
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|
2699 |
|
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|
2700 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 2701 _nextMarkBitMap->clearRange(mr); |
| 2702 } | |
| 2703 | |
|
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|
2704 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
|
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|
2705 clearRangePrevBitmap(mr); |
|
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|
2706 clearRangeNextBitmap(mr); |
|
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|
2707 } |
|
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|
2708 |
| 342 | 2709 HeapRegion* |
| 2710 ConcurrentMark::claim_region(int task_num) { | |
| 2711 // "checkpoint" the finger | |
| 2712 HeapWord* finger = _finger; | |
| 2713 | |
| 2714 // _heap_end will not change underneath our feet; it only changes at | |
| 2715 // yield points. | |
| 2716 while (finger < _heap_end) { | |
|
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|
2717 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 2718 |
| 3771 | 2719 // Note on how this code handles humongous regions. In the |
| 2720 // normal case the finger will reach the start of a "starts | |
| 2721 // humongous" (SH) region. Its end will either be the end of the | |
| 2722 // last "continues humongous" (CH) region in the sequence, or the | |
| 2723 // standard end of the SH region (if the SH is the only region in | |
| 2724 // the sequence). That way claim_region() will skip over the CH | |
| 2725 // regions. However, there is a subtle race between a CM thread | |
| 2726 // executing this method and a mutator thread doing a humongous | |
| 2727 // object allocation. The two are not mutually exclusive as the CM | |
| 2728 // thread does not need to hold the Heap_lock when it gets | |
| 2729 // here. So there is a chance that claim_region() will come across | |
| 2730 // a free region that's in the progress of becoming a SH or a CH | |
| 2731 // region. In the former case, it will either | |
| 2732 // a) Miss the update to the region's end, in which case it will | |
| 2733 // visit every subsequent CH region, will find their bitmaps | |
| 2734 // empty, and do nothing, or | |
| 2735 // b) Will observe the update of the region's end (in which case | |
| 2736 // it will skip the subsequent CH regions). | |
| 2737 // If it comes across a region that suddenly becomes CH, the | |
| 2738 // scenario will be similar to b). So, the race between | |
| 2739 // claim_region() and a humongous object allocation might force us | |
| 2740 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 2741 // iterations) but it should not introduce and correctness issues. | |
| 2742 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
| 342 | 2743 HeapWord* bottom = curr_region->bottom(); |
| 2744 HeapWord* end = curr_region->end(); | |
| 2745 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 2746 | |
| 3771 | 2747 if (verbose_low()) { |
| 342 | 2748 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
| 2749 "["PTR_FORMAT", "PTR_FORMAT"), " | |
| 2750 "limit = "PTR_FORMAT, | |
| 2751 task_num, curr_region, bottom, end, limit); | |
| 3771 | 2752 } |
| 2753 | |
| 2754 // Is the gap between reading the finger and doing the CAS too long? | |
| 2755 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 342 | 2756 if (res == finger) { |
| 2757 // we succeeded | |
| 2758 | |
| 2759 // notice that _finger == end cannot be guaranteed here since, | |
| 2760 // someone else might have moved the finger even further | |
|
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|
2761 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 2762 |
|
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|
2763 if (verbose_low()) { |
| 342 | 2764 gclog_or_tty->print_cr("[%d] we were successful with region = " |
| 2765 PTR_FORMAT, task_num, curr_region); | |
|
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|
2766 } |
| 342 | 2767 |
| 2768 if (limit > bottom) { | |
|
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|
2769 if (verbose_low()) { |
| 342 | 2770 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
| 2771 "returning it ", task_num, curr_region); | |
|
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|
2772 } |
| 342 | 2773 return curr_region; |
| 2774 } else { | |
|
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|
2775 assert(limit == bottom, |
|
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|
2776 "the region limit should be at bottom"); |
|
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|
2777 if (verbose_low()) { |
| 342 | 2778 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
| 2779 "returning NULL", task_num, curr_region); | |
|
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|
2780 } |
| 342 | 2781 // we return NULL and the caller should try calling |
| 2782 // claim_region() again. | |
| 2783 return NULL; | |
| 2784 } | |
| 2785 } else { | |
|
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|
2786 assert(_finger > finger, "the finger should have moved forward"); |
|
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|
2787 if (verbose_low()) { |
| 342 | 2788 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
| 2789 "global finger = "PTR_FORMAT", " | |
| 2790 "our finger = "PTR_FORMAT, | |
| 2791 task_num, _finger, finger); | |
|
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|
2792 } |
| 342 | 2793 |
| 2794 // read it again | |
| 2795 finger = _finger; | |
| 2796 } | |
| 2797 } | |
| 2798 | |
| 2799 return NULL; | |
| 2800 } | |
| 2801 | |
|
1835
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|
2802 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
|
4787
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|
2803 guarantee(false, "invalidate_aborted_regions_in_cset(): " |
|
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|
2804 "don't call this any more"); |
|
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|
2805 |
|
1835
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|
2806 bool result = false; |
|
4805b9f4779e
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|
2807 for (int i = 0; i < (int)_max_task_num; ++i) { |
|
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|
2808 CMTask* the_task = _tasks[i]; |
|
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|
2809 MemRegion mr = the_task->aborted_region(); |
|
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|
2810 if (mr.start() != NULL) { |
|
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|
2811 assert(mr.end() != NULL, "invariant"); |
|
4805b9f4779e
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|
2812 assert(mr.word_size() > 0, "invariant"); |
|
4805b9f4779e
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|
2813 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
|
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|
2814 assert(hr != NULL, "invariant"); |
|
4805b9f4779e
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|
2815 if (hr->in_collection_set()) { |
|
4805b9f4779e
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|
2816 // The region points into the collection set |
|
4805b9f4779e
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|
2817 the_task->set_aborted_region(MemRegion()); |
|
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|
2818 result = true; |
|
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|
2819 } |
|
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|
2820 } |
|
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|
2821 } |
|
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|
2822 return result; |
|
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|
2823 } |
|
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|
2824 |
|
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|
2825 bool ConcurrentMark::has_aborted_regions() { |
|
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|
2826 for (int i = 0; i < (int)_max_task_num; ++i) { |
|
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|
2827 CMTask* the_task = _tasks[i]; |
|
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|
2828 MemRegion mr = the_task->aborted_region(); |
|
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|
2829 if (mr.start() != NULL) { |
|
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|
2830 assert(mr.end() != NULL, "invariant"); |
|
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|
2831 assert(mr.word_size() > 0, "invariant"); |
|
4805b9f4779e
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|
2832 return true; |
|
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|
2833 } |
|
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|
2834 } |
|
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|
2835 return false; |
|
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|
2836 } |
|
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|
2837 |
| 342 | 2838 void ConcurrentMark::oops_do(OopClosure* cl) { |
|
3776
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|
2839 if (_markStack.size() > 0 && verbose_low()) { |
| 342 | 2840 gclog_or_tty->print_cr("[global] scanning the global marking stack, " |
| 2841 "size = %d", _markStack.size()); | |
|
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|
2842 } |
| 342 | 2843 // we first iterate over the contents of the mark stack... |
| 2844 _markStack.oops_do(cl); | |
| 2845 | |
| 2846 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 2847 OopTaskQueue* queue = _task_queues->queue((int)i); | |
| 2848 | |
|
3776
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|
2849 if (queue->size() > 0 && verbose_low()) { |
| 342 | 2850 gclog_or_tty->print_cr("[global] scanning task queue of task %d, " |
| 2851 "size = %d", i, queue->size()); | |
|
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|
2852 } |
| 342 | 2853 |
| 2854 // ...then over the contents of the all the task queues. | |
| 2855 queue->oops_do(cl); | |
| 2856 } | |
|
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|
2857 } |
|
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|
2858 |
|
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|
2859 #ifndef PRODUCT |
|
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|
2860 enum VerifyNoCSetOopsPhase { |
|
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|
2861 VerifyNoCSetOopsStack, |
|
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|
2862 VerifyNoCSetOopsQueues, |
|
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|
2863 VerifyNoCSetOopsSATBCompleted, |
|
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|
2864 VerifyNoCSetOopsSATBThread |
|
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|
2865 }; |
|
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|
2866 |
|
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|
2867 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
|
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|
2868 private: |
|
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|
2869 G1CollectedHeap* _g1h; |
|
2ace1c4ee8da
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|
2870 VerifyNoCSetOopsPhase _phase; |
|
2ace1c4ee8da
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|
2871 int _info; |
|
2ace1c4ee8da
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|
2872 |
|
2ace1c4ee8da
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|
2873 const char* phase_str() { |
|
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|
2874 switch (_phase) { |
|
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|
2875 case VerifyNoCSetOopsStack: return "Stack"; |
|
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|
2876 case VerifyNoCSetOopsQueues: return "Queue"; |
|
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|
2877 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
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|
2878 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
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|
2879 default: ShouldNotReachHere(); |
|
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|
2880 } |
|
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parents:
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diff
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|
2881 return NULL; |
|
2ace1c4ee8da
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parents:
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diff
changeset
|
2882 } |
|
2ace1c4ee8da
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parents:
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diff
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|
2883 |
|
2ace1c4ee8da
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|
2884 void do_object_work(oop obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2885 guarantee(!_g1h->obj_in_cs(obj), |
|
2ace1c4ee8da
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|
2886 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
2ace1c4ee8da
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|
2887 (void*) obj, phase_str(), _info)); |
|
2ace1c4ee8da
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|
2888 } |
|
2ace1c4ee8da
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|
2889 |
|
2ace1c4ee8da
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|
2890 public: |
|
2ace1c4ee8da
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|
2891 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
|
2ace1c4ee8da
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|
2892 |
|
2ace1c4ee8da
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|
2893 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
2ace1c4ee8da
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|
2894 _phase = phase; |
|
2ace1c4ee8da
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|
2895 _info = info; |
|
2ace1c4ee8da
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|
2896 } |
|
2ace1c4ee8da
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|
2897 |
|
2ace1c4ee8da
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|
2898 virtual void do_oop(oop* p) { |
|
2ace1c4ee8da
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|
2899 oop obj = oopDesc::load_decode_heap_oop(p); |
|
2ace1c4ee8da
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|
2900 do_object_work(obj); |
|
2ace1c4ee8da
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|
2901 } |
|
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|
2902 |
|
2ace1c4ee8da
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|
2903 virtual void do_oop(narrowOop* p) { |
|
2ace1c4ee8da
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|
2904 // We should not come across narrow oops while scanning marking |
|
2ace1c4ee8da
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diff
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|
2905 // stacks and SATB buffers. |
|
2ace1c4ee8da
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diff
changeset
|
2906 ShouldNotReachHere(); |
|
2ace1c4ee8da
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changeset
|
2907 } |
|
2ace1c4ee8da
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|
2908 |
|
2ace1c4ee8da
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|
2909 virtual void do_object(oop obj) { |
|
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|
2910 do_object_work(obj); |
|
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|
2911 } |
|
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|
2912 }; |
|
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|
2913 |
|
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|
2914 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
2ace1c4ee8da
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|
2915 bool verify_enqueued_buffers, |
|
2ace1c4ee8da
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|
2916 bool verify_thread_buffers, |
|
2ace1c4ee8da
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|
2917 bool verify_fingers) { |
|
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|
2918 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
|
2ace1c4ee8da
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|
2919 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
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|
2920 return; |
| 342 | 2921 } |
|
1835
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|
2922 |
|
4787
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|
2923 VerifyNoCSetOopsClosure cl; |
|
2ace1c4ee8da
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|
2924 |
|
2ace1c4ee8da
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|
2925 if (verify_stacks) { |
|
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|
2926 // Verify entries on the global mark stack |
|
2ace1c4ee8da
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|
2927 cl.set_phase(VerifyNoCSetOopsStack); |
|
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|
2928 _markStack.oops_do(&cl); |
|
2ace1c4ee8da
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|
2929 |
|
2ace1c4ee8da
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|
2930 // Verify entries on the task queues |
|
2ace1c4ee8da
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|
2931 for (int i = 0; i < (int) _max_task_num; i += 1) { |
|
2ace1c4ee8da
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|
2932 cl.set_phase(VerifyNoCSetOopsQueues, i); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2933 OopTaskQueue* queue = _task_queues->queue(i); |
|
2ace1c4ee8da
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|
2934 queue->oops_do(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
2935 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2936 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2937 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
2938 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2939 |
|
2ace1c4ee8da
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changeset
|
2940 // Verify entries on the enqueued SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
2941 if (verify_enqueued_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2942 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
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tonyp
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|
2943 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
2ace1c4ee8da
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|
2944 } |
|
2ace1c4ee8da
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|
2945 |
|
2ace1c4ee8da
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changeset
|
2946 // Verify entries on the per-thread SATB buffers |
|
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|
2947 if (verify_thread_buffers) { |
|
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|
2948 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
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|
2949 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
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|
2950 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
2951 |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2952 if (verify_fingers) { |
|
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|
2953 // Verify the global finger |
|
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|
2954 HeapWord* global_finger = finger(); |
|
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|
2955 if (global_finger != NULL && global_finger < _heap_end) { |
|
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|
2956 // The global finger always points to a heap region boundary. We |
|
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|
2957 // use heap_region_containing_raw() to get the containing region |
|
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|
2958 // given that the global finger could be pointing to a free region |
|
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|
2959 // which subsequently becomes continues humongous. If that |
|
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|
2960 // happens, heap_region_containing() will return the bottom of the |
|
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|
2961 // corresponding starts humongous region and the check below will |
|
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|
2962 // not hold any more. |
|
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|
2963 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
|
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|
2964 guarantee(global_finger == global_hr->bottom(), |
|
2ace1c4ee8da
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|
2965 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
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|
2966 global_finger, HR_FORMAT_PARAMS(global_hr))); |
|
2ace1c4ee8da
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|
2967 } |
|
2ace1c4ee8da
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changeset
|
2968 |
|
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changeset
|
2969 // Verify the task fingers |
|
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|
2970 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
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|
2971 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
|
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|
2972 CMTask* task = _tasks[i]; |
|
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|
2973 HeapWord* task_finger = task->finger(); |
|
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|
2974 if (task_finger != NULL && task_finger < _heap_end) { |
|
2ace1c4ee8da
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|
2975 // See above note on the global finger verification. |
|
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|
2976 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
|
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|
2977 guarantee(task_finger == task_hr->bottom() || |
|
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|
2978 !task_hr->in_collection_set(), |
|
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|
2979 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
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|
2980 task_finger, HR_FORMAT_PARAMS(task_hr))); |
|
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|
2981 } |
|
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|
2982 } |
|
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|
2983 } |
| 342 | 2984 } |
|
4787
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|
2985 #endif // PRODUCT |
| 342 | 2986 |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
2987 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
| 342 | 2988 _markStack.setEmpty(); |
| 2989 _markStack.clear_overflow(); | |
| 2990 _regionStack.setEmpty(); | |
| 2991 _regionStack.clear_overflow(); | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
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|
2992 if (clear_overflow) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
2993 clear_has_overflown(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
2994 } else { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
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|
2995 assert(has_overflown(), "pre-condition"); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
2996 } |
| 342 | 2997 _finger = _heap_start; |
| 2998 | |
| 2999 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3000 OopTaskQueue* queue = _task_queues->queue(i); | |
| 3001 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
|
3002 // 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
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changeset
|
3003 _tasks[i]->clear_aborted_region(); |
| 342 | 3004 } |
| 3005 } | |
| 3006 | |
| 3007 void ConcurrentMark::print_stats() { | |
| 3008 if (verbose_stats()) { | |
| 3009 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3010 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3011 _tasks[i]->print_stats(); | |
| 3012 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3013 } | |
| 3014 } | |
| 3015 } | |
| 3016 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3017 // Closures used by ConcurrentMark::complete_marking_in_collection_set(). |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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diff
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|
3018 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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changeset
|
3019 class CSetMarkOopClosure: public OopClosure { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
3020 friend class CSetMarkBitMapClosure; |
| 342 | 3021 |
| 3022 G1CollectedHeap* _g1h; | |
| 3023 CMBitMap* _bm; | |
| 3024 ConcurrentMark* _cm; | |
| 3025 oop* _ms; | |
| 3026 jint* _array_ind_stack; | |
| 3027 int _ms_size; | |
| 3028 int _ms_ind; | |
| 3029 int _array_increment; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
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changeset
|
3030 uint _worker_id; |
| 342 | 3031 |
| 3032 bool push(oop obj, int arr_ind = 0) { | |
| 3033 if (_ms_ind == _ms_size) { | |
| 3034 gclog_or_tty->print_cr("Mark stack is full."); | |
| 3035 return false; | |
| 3036 } | |
| 3037 _ms[_ms_ind] = obj; | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3038 if (obj->is_objArray()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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changeset
|
3039 _array_ind_stack[_ms_ind] = arr_ind; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
3040 } |
| 342 | 3041 _ms_ind++; |
| 3042 return true; | |
| 3043 } | |
| 3044 | |
| 3045 oop pop() { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3046 if (_ms_ind == 0) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3047 return NULL; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3048 } else { |
| 342 | 3049 _ms_ind--; |
| 3050 return _ms[_ms_ind]; | |
| 3051 } | |
| 3052 } | |
| 3053 | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
changeset
|
3054 template <class T> bool drain() { |
| 342 | 3055 while (_ms_ind > 0) { |
| 3056 oop obj = pop(); | |
| 3057 assert(obj != NULL, "Since index was non-zero."); | |
| 3058 if (obj->is_objArray()) { | |
| 3059 jint arr_ind = _array_ind_stack[_ms_ind]; | |
| 3060 objArrayOop aobj = objArrayOop(obj); | |
| 3061 jint len = aobj->length(); | |
| 3062 jint next_arr_ind = arr_ind + _array_increment; | |
| 3063 if (next_arr_ind < len) { | |
| 3064 push(obj, next_arr_ind); | |
| 3065 } | |
| 3066 // Now process this portion of this one. | |
| 3067 int lim = MIN2(next_arr_ind, len); | |
| 3068 for (int j = arr_ind; j < lim; j++) { | |
|
912
308762b2bf14
6872000: G1: compilation fails on linux/older gcc
apetrusenko
parents:
866
diff
changeset
|
3069 do_oop(aobj->objArrayOopDesc::obj_at_addr<T>(j)); |
| 342 | 3070 } |
| 3071 } else { | |
| 3072 obj->oop_iterate(this); | |
| 3073 } | |
| 3074 if (abort()) return false; | |
| 3075 } | |
| 3076 return true; | |
| 3077 } | |
| 3078 | |
| 3079 public: | |
|
4728
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7121618: Change type of number of GC workers to unsigned int.
jmasa
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changeset
|
3080 CSetMarkOopClosure(ConcurrentMark* cm, int ms_size, uint worker_id) : |
| 342 | 3081 _g1h(G1CollectedHeap::heap()), |
| 3082 _cm(cm), | |
| 3083 _bm(cm->nextMarkBitMap()), | |
| 3084 _ms_size(ms_size), _ms_ind(0), | |
| 3085 _ms(NEW_C_HEAP_ARRAY(oop, ms_size)), | |
| 3086 _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
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|
3087 _array_increment(MAX2(ms_size/8, 16)), |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
3088 _worker_id(worker_id) { } |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
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|
3089 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3090 ~CSetMarkOopClosure() { |
| 342 | 3091 FREE_C_HEAP_ARRAY(oop, _ms); |
| 3092 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
| 3093 } | |
| 3094 | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
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|
3095 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
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|
3096 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
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|
3097 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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831
diff
changeset
|
3098 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
|
3099 T heap_oop = oopDesc::load_heap_oop(p); |
|
df6caf649ff7
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ysr
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diff
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|
3100 if (oopDesc::is_null(heap_oop)) return; |
|
df6caf649ff7
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diff
changeset
|
3101 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 342 | 3102 if (obj->is_forwarded()) { |
| 3103 // If the object has already been forwarded, we have to make sure | |
| 3104 // that it's marked. So follow the forwarding pointer. Note that | |
| 3105 // this does the right thing for self-forwarding pointers in the | |
| 3106 // evacuation failure case. | |
| 3107 obj = obj->forwardee(); | |
| 3108 } | |
| 3109 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
| 3110 if (hr != NULL) { | |
| 3111 if (hr->in_collection_set()) { | |
| 3112 if (_g1h->is_obj_ill(obj)) { | |
|
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3113 if (_bm->parMark((HeapWord*)obj)) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3114 if (!push(obj)) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3115 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
|
3116 set_abort(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3117 } |
| 342 | 3118 } |
| 3119 } | |
| 3120 } else { | |
| 3121 // Outside the collection set; we need to gray it | |
| 3122 _cm->deal_with_reference(obj); | |
| 3123 } | |
| 3124 } | |
| 3125 } | |
| 3126 }; | |
| 3127 | |
|
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3128 class CSetMarkBitMapClosure: public BitMapClosure { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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diff
changeset
|
3129 G1CollectedHeap* _g1h; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
3130 CMBitMap* _bitMap; |
|
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3131 ConcurrentMark* _cm; |
|
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3132 CSetMarkOopClosure _oop_cl; |
|
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|
3133 uint _worker_id; |
|
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|
3134 |
| 342 | 3135 public: |
|
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|
3136 CSetMarkBitMapClosure(ConcurrentMark* cm, int ms_size, int worker_id) : |
| 342 | 3137 _g1h(G1CollectedHeap::heap()), |
| 3138 _bitMap(cm->nextMarkBitMap()), | |
|
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|
3139 _oop_cl(cm, ms_size, worker_id), |
|
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|
3140 _worker_id(worker_id) { } |
| 342 | 3141 |
| 3142 bool do_bit(size_t offset) { | |
| 3143 // convert offset into a HeapWord* | |
| 3144 HeapWord* addr = _bitMap->offsetToHeapWord(offset); | |
| 3145 assert(_bitMap->endWord() && addr < _bitMap->endWord(), | |
| 3146 "address out of range"); | |
| 3147 assert(_bitMap->isMarked(addr), "tautology"); | |
| 3148 oop obj = oop(addr); | |
| 3149 if (!obj->is_forwarded()) { | |
| 3150 if (!_oop_cl.push(obj)) return false; | |
|
845
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|
3151 if (UseCompressedOops) { |
|
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|
3152 if (!_oop_cl.drain<narrowOop>()) return false; |
|
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|
3153 } else { |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
3154 if (!_oop_cl.drain<oop>()) return false; |
|
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|
3155 } |
| 342 | 3156 } |
| 3157 // Otherwise... | |
| 3158 return true; | |
| 3159 } | |
| 3160 }; | |
| 3161 | |
|
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|
3162 class CompleteMarkingInCSetHRClosure: public HeapRegionClosure { |
|
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|
3163 CMBitMap* _bm; |
|
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|
3164 CSetMarkBitMapClosure _bit_cl; |
|
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|
3165 uint _worker_id; |
|
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|
3166 |
| 342 | 3167 enum SomePrivateConstants { |
| 3168 MSSize = 1000 | |
| 3169 }; | |
|
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|
3170 |
| 342 | 3171 public: |
|
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|
3172 CompleteMarkingInCSetHRClosure(ConcurrentMark* cm, int worker_id) : |
| 342 | 3173 _bm(cm->nextMarkBitMap()), |
|
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3174 _bit_cl(cm, MSSize, worker_id), |
|
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|
3175 _worker_id(worker_id) { } |
|
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|
3176 |
|
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|
3177 bool doHeapRegion(HeapRegion* hr) { |
|
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|
3178 if (hr->claimHeapRegion(HeapRegion::CompleteMarkCSetClaimValue)) { |
|
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|
3179 // The current worker has successfully claimed the region. |
|
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|
3180 if (!hr->evacuation_failed()) { |
|
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|
3181 MemRegion mr = MemRegion(hr->bottom(), hr->next_top_at_mark_start()); |
|
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|
3182 if (!mr.is_empty()) { |
|
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|
3183 bool done = false; |
|
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|
3184 while (!done) { |
|
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|
3185 done = _bm->iterate(&_bit_cl, mr); |
|
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|
3186 } |
| 342 | 3187 } |
| 3188 } | |
| 3189 } | |
| 3190 return false; | |
| 3191 } | |
| 3192 }; | |
| 3193 | |
|
4097
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|
3194 class G1ParCompleteMarkInCSetTask: public AbstractGangTask { |
|
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|
3195 protected: |
|
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|
3196 G1CollectedHeap* _g1h; |
|
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|
3197 ConcurrentMark* _cm; |
|
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|
3198 |
|
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|
3199 public: |
|
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|
3200 G1ParCompleteMarkInCSetTask(G1CollectedHeap* g1h, |
|
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|
3201 ConcurrentMark* cm) : |
|
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|
3202 AbstractGangTask("Complete Mark in CSet"), |
|
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|
3203 _g1h(g1h), _cm(cm) { } |
|
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|
3204 |
|
4728
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|
3205 void work(uint worker_id) { |
|
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|
3206 CompleteMarkingInCSetHRClosure cmplt(_cm, worker_id); |
|
441e946dc1af
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|
3207 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id); |
|
4097
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|
3208 _g1h->collection_set_iterate_from(hr, &cmplt); |
|
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|
3209 } |
|
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|
3210 }; |
|
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|
3211 |
| 342 | 3212 void ConcurrentMark::complete_marking_in_collection_set() { |
|
4787
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|
3213 guarantee(false, "complete_marking_in_collection_set(): " |
|
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|
3214 "don't call this any more"); |
|
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|
3215 |
| 342 | 3216 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 3217 | |
| 3218 if (!g1h->mark_in_progress()) { | |
| 3219 g1h->g1_policy()->record_mark_closure_time(0.0); | |
| 3220 return; | |
| 3221 } | |
| 3222 | |
| 3223 double start = os::elapsedTime(); | |
|
4097
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|
3224 G1ParCompleteMarkInCSetTask complete_mark_task(g1h, this); |
|
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|
3225 |
|
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|
3226 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
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|
3227 |
|
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|
3228 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 4711 | 3229 int n_workers = g1h->workers()->active_workers(); |
|
4097
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|
3230 g1h->set_par_threads(n_workers); |
|
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|
3231 g1h->workers()->run_task(&complete_mark_task); |
|
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|
3232 g1h->set_par_threads(0); |
|
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|
3233 } else { |
|
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|
3234 complete_mark_task.work(0); |
| 342 | 3235 } |
|
4093
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|
3236 |
|
4097
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|
3237 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::CompleteMarkCSetClaimValue), "sanity"); |
|
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|
3238 |
|
4783
023652e49ac0
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|
3239 // Reset the claim values in the regions in the collection set. |
|
023652e49ac0
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|
3240 g1h->reset_cset_heap_region_claim_values(); |
|
4097
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|
3241 |
|
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|
3242 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
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|
3243 |
| 342 | 3244 double end_time = os::elapsedTime(); |
| 3245 double elapsed_time_ms = (end_time - start) * 1000.0; | |
| 3246 g1h->g1_policy()->record_mark_closure_time(elapsed_time_ms); | |
| 3247 } | |
| 3248 | |
| 3249 // The next two methods deal with the following optimisation. Some | |
| 3250 // objects are gray by being marked and located above the finger. If | |
| 3251 // they are copied, during an evacuation pause, below the finger then | |
| 3252 // the need to be pushed on the stack. The observation is that, if | |
| 3253 // there are no regions in the collection set located above the | |
| 3254 // finger, then the above cannot happen, hence we do not need to | |
| 3255 // explicitly gray any objects when copying them to below the | |
| 3256 // finger. The global stack will be scanned to ensure that, if it | |
| 3257 // points to objects being copied, it will update their | |
| 3258 // location. There is a tricky situation with the gray objects in | |
| 3259 // region stack that are being coped, however. See the comment in | |
| 3260 // newCSet(). | |
| 3261 | |
| 3262 void ConcurrentMark::newCSet() { | |
|
4787
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|
3263 guarantee(false, "newCSet(): don't call this any more"); |
|
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|
3264 |
|
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|
3265 if (!concurrent_marking_in_progress()) { |
| 342 | 3266 // nothing to do if marking is not in progress |
| 3267 return; | |
|
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|
3268 } |
| 342 | 3269 |
| 3270 // find what the lowest finger is among the global and local fingers | |
| 3271 _min_finger = _finger; | |
| 3272 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3273 CMTask* task = _tasks[i]; | |
| 3274 HeapWord* task_finger = task->finger(); | |
|
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|
3275 if (task_finger != NULL && task_finger < _min_finger) { |
| 342 | 3276 _min_finger = task_finger; |
|
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|
3277 } |
| 342 | 3278 } |
| 3279 | |
| 3280 _should_gray_objects = false; | |
| 3281 | |
| 3282 // This fixes a very subtle and fustrating bug. It might be the case | |
| 3283 // that, during en evacuation pause, heap regions that contain | |
| 3284 // objects that are gray (by being in regions contained in the | |
| 3285 // region stack) are included in the collection set. Since such gray | |
| 3286 // objects will be moved, and because it's not easy to redirect | |
| 3287 // region stack entries to point to a new location (because objects | |
| 3288 // in one region might be scattered to multiple regions after they | |
| 3289 // are copied), one option is to ensure that all marked objects | |
| 3290 // copied during a pause are pushed on the stack. Notice, however, | |
| 3291 // that this problem can only happen when the region stack is not | |
| 3292 // empty during an evacuation pause. So, we make the fix a bit less | |
| 3293 // conservative and ensure that regions are pushed on the stack, | |
| 3294 // irrespective whether all collection set regions are below the | |
| 3295 // finger, if the region stack is not empty. This is expected to be | |
| 3296 // a rare case, so I don't think it's necessary to be smarted about it. | |
|
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|
3297 if (!region_stack_empty() || has_aborted_regions()) { |
| 342 | 3298 _should_gray_objects = true; |
|
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|
3299 } |
| 342 | 3300 } |
| 3301 | |
| 3302 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
|
4787
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|
3303 guarantee(false, "registerCSetRegion(): don't call this any more"); |
|
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|
3304 |
|
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|
3305 if (!concurrent_marking_in_progress()) return; |
| 342 | 3306 |
| 3307 HeapWord* region_end = hr->end(); | |
|
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|
3308 if (region_end > _min_finger) { |
| 342 | 3309 _should_gray_objects = true; |
|
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|
3310 } |
| 342 | 3311 } |
| 3312 | |
|
3378
69293e516993
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|
3313 // Resets the region fields of active CMTasks whose values point |
|
69293e516993
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|
3314 // into the collection set. |
|
69293e516993
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|
3315 void ConcurrentMark::reset_active_task_region_fields_in_cset() { |
|
4787
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|
3316 guarantee(false, "reset_active_task_region_fields_in_cset(): " |
|
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|
3317 "don't call this any more"); |
|
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|
3318 |
|
3378
69293e516993
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diff
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|
3319 assert(SafepointSynchronize::is_at_safepoint(), "should be in STW"); |
|
69293e516993
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|
3320 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
69293e516993
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|
3321 |
|
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|
3322 for (int i = 0; i < (int)parallel_marking_threads(); i += 1) { |
|
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|
3323 CMTask* task = _tasks[i]; |
|
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|
3324 HeapWord* task_finger = task->finger(); |
|
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|
3325 if (task_finger != NULL) { |
|
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|
3326 assert(_g1h->is_in_g1_reserved(task_finger), "not in heap"); |
|
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|
3327 HeapRegion* finger_region = _g1h->heap_region_containing(task_finger); |
|
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|
3328 if (finger_region->in_collection_set()) { |
|
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|
3329 // The task's current region is in the collection set. |
|
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|
3330 // This region will be evacuated in the current GC and |
|
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|
3331 // the region fields in the task will be stale. |
|
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|
3332 task->giveup_current_region(); |
|
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|
3333 } |
|
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|
3334 } |
|
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|
3335 } |
|
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|
3336 } |
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|
3337 |
| 342 | 3338 // abandon current marking iteration due to a Full GC |
| 3339 void ConcurrentMark::abort() { | |
| 3340 // Clear all marks to force marking thread to do nothing | |
| 3341 _nextMarkBitMap->clearAll(); | |
| 3342 // Empty mark stack | |
| 3343 clear_marking_state(); | |
|
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3344 for (int i = 0; i < (int)_max_task_num; ++i) { |
| 342 | 3345 _tasks[i]->clear_region_fields(); |
|
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3346 } |
| 342 | 3347 _has_aborted = true; |
| 3348 | |
| 3349 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3350 satb_mq_set.abandon_partial_marking(); | |
|
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3351 // This can be called either during or outside marking, we'll read |
|
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|
3352 // the expected_active value from the SATB queue set. |
|
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|
3353 satb_mq_set.set_active_all_threads( |
|
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|
3354 false, /* new active value */ |
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|
3355 satb_mq_set.is_active() /* expected_active */); |
| 342 | 3356 } |
| 3357 | |
| 3358 static void print_ms_time_info(const char* prefix, const char* name, | |
| 3359 NumberSeq& ns) { | |
| 3360 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3361 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3362 if (ns.num() > 0) { | |
| 3363 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3364 prefix, ns.sd(), ns.maximum()); | |
| 3365 } | |
| 3366 } | |
| 3367 | |
| 3368 void ConcurrentMark::print_summary_info() { | |
| 3369 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3370 print_ms_time_info(" ", "init marks", _init_times); | |
| 3371 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3372 { | |
| 3373 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3374 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3375 | |
| 3376 } | |
| 3377 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3378 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3379 _total_counting_time, | |
| 3380 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3381 (double)_cleanup_times.num() | |
| 3382 : 0.0)); | |
| 3383 if (G1ScrubRemSets) { | |
| 3384 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3385 _total_rs_scrub_time, | |
| 3386 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3387 (double)_cleanup_times.num() | |
| 3388 : 0.0)); | |
| 3389 } | |
| 3390 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3391 (_init_times.sum() + _remark_times.sum() + | |
| 3392 _cleanup_times.sum())/1000.0); | |
| 3393 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
| 3394 "(%8.2f s marking, %8.2f s counting).", | |
| 3395 cmThread()->vtime_accum(), | |
| 3396 cmThread()->vtime_mark_accum(), | |
| 3397 cmThread()->vtime_count_accum()); | |
| 3398 } | |
| 3399 | |
| 1019 | 3400 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
| 3401 _parallel_workers->print_worker_threads_on(st); | |
| 3402 } | |
| 3403 | |
| 342 | 3404 // Closures |
| 3405 // XXX: there seems to be a lot of code duplication here; | |
| 3406 // should refactor and consolidate the shared code. | |
| 3407 | |
| 3408 // This closure is used to mark refs into the CMS generation in | |
| 3409 // the CMS bit map. Called at the first checkpoint. | |
| 3410 | |
| 3411 // We take a break if someone is trying to stop the world. | |
|
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3412 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 342 | 3413 if (should_yield()) { |
|
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|
3414 if (worker_id == 0) { |
| 342 | 3415 _g1h->g1_policy()->record_concurrent_pause(); |
|
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|
3416 } |
| 342 | 3417 cmThread()->yield(); |
|
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|
3418 if (worker_id == 0) { |
| 342 | 3419 _g1h->g1_policy()->record_concurrent_pause_end(); |
|
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|
3420 } |
| 342 | 3421 return true; |
| 3422 } else { | |
| 3423 return false; | |
| 3424 } | |
| 3425 } | |
| 3426 | |
| 3427 bool ConcurrentMark::should_yield() { | |
| 3428 return cmThread()->should_yield(); | |
| 3429 } | |
| 3430 | |
| 3431 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 3432 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 3433 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 3434 } | |
| 3435 | |
| 3436 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 3437 void* last) { | |
|
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|
3438 return containing_card_is_marked(start) && |
|
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|
3439 containing_card_is_marked(last); |
| 342 | 3440 } |
| 3441 | |
| 3442 #ifndef PRODUCT | |
| 3443 // for debugging purposes | |
| 3444 void ConcurrentMark::print_finger() { | |
| 3445 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
| 3446 _heap_start, _heap_end, _finger); | |
| 3447 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 3448 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
| 3449 } | |
| 3450 gclog_or_tty->print_cr(""); | |
| 3451 } | |
| 3452 #endif | |
| 3453 | |
| 3771 | 3454 void CMTask::scan_object(oop obj) { |
| 3455 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3456 | |
| 3457 if (_cm->verbose_high()) { | |
| 3458 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
| 3459 _task_id, (void*) obj); | |
| 3460 } | |
| 3461 | |
| 3462 size_t obj_size = obj->size(); | |
| 3463 _words_scanned += obj_size; | |
| 3464 | |
| 3465 obj->oop_iterate(_cm_oop_closure); | |
| 3466 statsOnly( ++_objs_scanned ); | |
| 3467 check_limits(); | |
| 3468 } | |
| 3469 | |
| 342 | 3470 // Closure for iteration over bitmaps |
| 3471 class CMBitMapClosure : public BitMapClosure { | |
| 3472 private: | |
| 3473 // the bitmap that is being iterated over | |
| 3474 CMBitMap* _nextMarkBitMap; | |
| 3475 ConcurrentMark* _cm; | |
| 3476 CMTask* _task; | |
| 3477 // true if we're scanning a heap region claimed by the task (so that | |
| 3478 // we move the finger along), false if we're not, i.e. currently when | |
| 3479 // scanning a heap region popped from the region stack (so that we | |
| 3480 // do not move the task finger along; it'd be a mistake if we did so). | |
| 3481 bool _scanning_heap_region; | |
| 3482 | |
| 3483 public: | |
| 3484 CMBitMapClosure(CMTask *task, | |
| 3485 ConcurrentMark* cm, | |
| 3486 CMBitMap* nextMarkBitMap) | |
| 3487 : _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } | |
| 3488 | |
| 3489 void set_scanning_heap_region(bool scanning_heap_region) { | |
| 3490 _scanning_heap_region = scanning_heap_region; | |
| 3491 } | |
| 3492 | |
| 3493 bool do_bit(size_t offset) { | |
| 3494 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
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|
3495 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
|
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|
3496 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3497 |
| 3498 if (_scanning_heap_region) { | |
| 3499 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
|
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|
3500 assert(addr >= _task->finger(), "invariant"); |
| 342 | 3501 // We move that task's local finger along. |
| 3502 _task->move_finger_to(addr); | |
| 3503 } else { | |
| 3504 // We move the task's region finger along. | |
| 3505 _task->move_region_finger_to(addr); | |
| 3506 } | |
| 3507 | |
| 3508 _task->scan_object(oop(addr)); | |
| 3509 // we only partially drain the local queue and global stack | |
| 3510 _task->drain_local_queue(true); | |
| 3511 _task->drain_global_stack(true); | |
| 3512 | |
| 3513 // if the has_aborted flag has been raised, we need to bail out of | |
| 3514 // the iteration | |
| 3515 return !_task->has_aborted(); | |
| 3516 } | |
| 3517 }; | |
| 3518 | |
| 3519 // Closure for iterating over objects, currently only used for | |
| 3520 // processing SATB buffers. | |
| 3521 class CMObjectClosure : public ObjectClosure { | |
| 3522 private: | |
| 3523 CMTask* _task; | |
| 3524 | |
| 3525 public: | |
| 3526 void do_object(oop obj) { | |
| 3527 _task->deal_with_reference(obj); | |
| 3528 } | |
| 3529 | |
| 3530 CMObjectClosure(CMTask* task) : _task(task) { } | |
| 3531 }; | |
| 3532 | |
| 3771 | 3533 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 3534 ConcurrentMark* cm, | |
| 3535 CMTask* task) | |
| 3536 : _g1h(g1h), _cm(cm), _task(task) { | |
| 3537 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 3538 | |
| 3539 if (G1UseConcMarkReferenceProcessing) { | |
|
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|
3540 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 3541 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 3542 } |
| 3771 | 3543 } |
| 342 | 3544 |
| 3545 void CMTask::setup_for_region(HeapRegion* hr) { | |
|
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|
3546 // Separated the asserts so that we know which one fires. |
|
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|
3547 assert(hr != NULL, |
|
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|
3548 "claim_region() should have filtered out continues humongous regions"); |
|
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|
3549 assert(!hr->continuesHumongous(), |
|
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|
3550 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 3551 |
|
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|
3552 if (_cm->verbose_low()) { |
| 342 | 3553 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
| 3554 _task_id, hr); | |
|
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|
3555 } |
| 342 | 3556 |
| 3557 _curr_region = hr; | |
| 3558 _finger = hr->bottom(); | |
| 3559 update_region_limit(); | |
| 3560 } | |
| 3561 | |
| 3562 void CMTask::update_region_limit() { | |
| 3563 HeapRegion* hr = _curr_region; | |
| 3564 HeapWord* bottom = hr->bottom(); | |
| 3565 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 3566 | |
| 3567 if (limit == bottom) { | |
|
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|
3568 if (_cm->verbose_low()) { |
| 342 | 3569 gclog_or_tty->print_cr("[%d] found an empty region " |
| 3570 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 3571 _task_id, bottom, limit); | |
|
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|
3572 } |
| 342 | 3573 // The region was collected underneath our feet. |
| 3574 // We set the finger to bottom to ensure that the bitmap | |
| 3575 // iteration that will follow this will not do anything. | |
| 3576 // (this is not a condition that holds when we set the region up, | |
| 3577 // as the region is not supposed to be empty in the first place) | |
| 3578 _finger = bottom; | |
| 3579 } else if (limit >= _region_limit) { | |
|
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|
3580 assert(limit >= _finger, "peace of mind"); |
| 342 | 3581 } else { |
|
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|
3582 assert(limit < _region_limit, "only way to get here"); |
| 342 | 3583 // This can happen under some pretty unusual circumstances. An |
| 3584 // evacuation pause empties the region underneath our feet (NTAMS | |
| 3585 // at bottom). We then do some allocation in the region (NTAMS | |
| 3586 // stays at bottom), followed by the region being used as a GC | |
| 3587 // alloc region (NTAMS will move to top() and the objects | |
| 3588 // originally below it will be grayed). All objects now marked in | |
| 3589 // the region are explicitly grayed, if below the global finger, | |
| 3590 // and we do not need in fact to scan anything else. So, we simply | |
| 3591 // set _finger to be limit to ensure that the bitmap iteration | |
| 3592 // doesn't do anything. | |
| 3593 _finger = limit; | |
| 3594 } | |
| 3595 | |
| 3596 _region_limit = limit; | |
| 3597 } | |
| 3598 | |
| 3599 void CMTask::giveup_current_region() { | |
|
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|
3600 assert(_curr_region != NULL, "invariant"); |
|
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|
3601 if (_cm->verbose_low()) { |
| 342 | 3602 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
| 3603 _task_id, _curr_region); | |
|
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|
3604 } |
| 342 | 3605 clear_region_fields(); |
| 3606 } | |
| 3607 | |
| 3608 void CMTask::clear_region_fields() { | |
| 3609 // Values for these three fields that indicate that we're not | |
| 3610 // holding on to a region. | |
| 3611 _curr_region = NULL; | |
| 3612 _finger = NULL; | |
| 3613 _region_limit = NULL; | |
| 3614 | |
| 3615 _region_finger = NULL; | |
| 3616 } | |
| 3617 | |
| 3771 | 3618 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 3619 if (cm_oop_closure == NULL) { | |
| 3620 assert(_cm_oop_closure != NULL, "invariant"); | |
| 3621 } else { | |
| 3622 assert(_cm_oop_closure == NULL, "invariant"); | |
| 3623 } | |
| 3624 _cm_oop_closure = cm_oop_closure; | |
| 3625 } | |
| 3626 | |
| 342 | 3627 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
|
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|
3628 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 3629 |
|
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|
3630 if (_cm->verbose_low()) { |
| 342 | 3631 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
|
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|
3632 } |
| 342 | 3633 |
| 3634 _nextMarkBitMap = nextMarkBitMap; | |
| 3635 clear_region_fields(); | |
|
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|
3636 assert(_aborted_region.is_empty(), "should have been cleared"); |
| 342 | 3637 |
| 3638 _calls = 0; | |
| 3639 _elapsed_time_ms = 0.0; | |
| 3640 _termination_time_ms = 0.0; | |
| 3641 _termination_start_time_ms = 0.0; | |
| 3642 | |
| 3643 #if _MARKING_STATS_ | |
| 3644 _local_pushes = 0; | |
| 3645 _local_pops = 0; | |
| 3646 _local_max_size = 0; | |
| 3647 _objs_scanned = 0; | |
| 3648 _global_pushes = 0; | |
| 3649 _global_pops = 0; | |
| 3650 _global_max_size = 0; | |
| 3651 _global_transfers_to = 0; | |
| 3652 _global_transfers_from = 0; | |
| 3653 _region_stack_pops = 0; | |
| 3654 _regions_claimed = 0; | |
| 3655 _objs_found_on_bitmap = 0; | |
| 3656 _satb_buffers_processed = 0; | |
| 3657 _steal_attempts = 0; | |
| 3658 _steals = 0; | |
| 3659 _aborted = 0; | |
| 3660 _aborted_overflow = 0; | |
| 3661 _aborted_cm_aborted = 0; | |
| 3662 _aborted_yield = 0; | |
| 3663 _aborted_timed_out = 0; | |
| 3664 _aborted_satb = 0; | |
| 3665 _aborted_termination = 0; | |
| 3666 #endif // _MARKING_STATS_ | |
| 3667 } | |
| 3668 | |
| 3669 bool CMTask::should_exit_termination() { | |
| 3670 regular_clock_call(); | |
| 3671 // This is called when we are in the termination protocol. We should | |
| 3672 // quit if, for some reason, this task wants to abort or the global | |
| 3673 // stack is not empty (this means that we can get work from it). | |
| 3674 return !_cm->mark_stack_empty() || has_aborted(); | |
| 3675 } | |
| 3676 | |
| 3677 void CMTask::reached_limit() { | |
|
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3678 assert(_words_scanned >= _words_scanned_limit || |
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3679 _refs_reached >= _refs_reached_limit , |
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3680 "shouldn't have been called otherwise"); |
| 342 | 3681 regular_clock_call(); |
| 3682 } | |
| 3683 | |
| 3684 void CMTask::regular_clock_call() { | |
|
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3685 if (has_aborted()) return; |
| 342 | 3686 |
| 3687 // First, we need to recalculate the words scanned and refs reached | |
| 3688 // limits for the next clock call. | |
| 3689 recalculate_limits(); | |
| 3690 | |
| 3691 // During the regular clock call we do the following | |
| 3692 | |
| 3693 // (1) If an overflow has been flagged, then we abort. | |
| 3694 if (_cm->has_overflown()) { | |
| 3695 set_has_aborted(); | |
| 3696 return; | |
| 3697 } | |
| 3698 | |
| 3699 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 3700 // to check anything else. The other steps are only needed during | |
| 3701 // the concurrent marking phase. | |
|
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3702 if (!concurrent()) return; |
| 342 | 3703 |
| 3704 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 3705 if (_cm->has_aborted()) { | |
| 3706 set_has_aborted(); | |
| 3707 statsOnly( ++_aborted_cm_aborted ); | |
| 3708 return; | |
| 3709 } | |
| 3710 | |
| 3711 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 3712 | |
| 3713 // (3) If marking stats are enabled, then we update the step history. | |
| 3714 #if _MARKING_STATS_ | |
|
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3715 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 3716 ++_clock_due_to_scanning; |
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3717 } |
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3718 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 3719 ++_clock_due_to_marking; |
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3720 } |
| 342 | 3721 |
| 3722 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 3723 _interval_start_time_ms = curr_time_ms; | |
| 3724 _all_clock_intervals_ms.add(last_interval_ms); | |
| 3725 | |
| 3726 if (_cm->verbose_medium()) { | |
|
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3727 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
|
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3728 "scanned = %d%s, refs reached = %d%s", |
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3729 _task_id, last_interval_ms, |
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3730 _words_scanned, |
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3731 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3732 _refs_reached, |
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3733 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 3734 } |
| 3735 #endif // _MARKING_STATS_ | |
| 3736 | |
| 3737 // (4) We check whether we should yield. If we have to, then we abort. | |
| 3738 if (_cm->should_yield()) { | |
| 3739 // We should yield. To do this we abort the task. The caller is | |
| 3740 // responsible for yielding. | |
| 3741 set_has_aborted(); | |
| 3742 statsOnly( ++_aborted_yield ); | |
| 3743 return; | |
| 3744 } | |
| 3745 | |
| 3746 // (5) We check whether we've reached our time quota. If we have, | |
| 3747 // then we abort. | |
| 3748 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 3749 if (elapsed_time_ms > _time_target_ms) { | |
| 3750 set_has_aborted(); | |
|
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3751 _has_timed_out = true; |
| 342 | 3752 statsOnly( ++_aborted_timed_out ); |
| 3753 return; | |
| 3754 } | |
| 3755 | |
| 3756 // (6) Finally, we check whether there are enough completed STAB | |
| 3757 // buffers available for processing. If there are, we abort. | |
| 3758 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3759 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
|
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3760 if (_cm->verbose_low()) { |
| 342 | 3761 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
| 3762 _task_id); | |
|
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3763 } |
| 342 | 3764 // we do need to process SATB buffers, we'll abort and restart |
| 3765 // the marking task to do so | |
| 3766 set_has_aborted(); | |
| 3767 statsOnly( ++_aborted_satb ); | |
| 3768 return; | |
| 3769 } | |
| 3770 } | |
| 3771 | |
| 3772 void CMTask::recalculate_limits() { | |
| 3773 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 3774 _words_scanned_limit = _real_words_scanned_limit; | |
| 3775 | |
| 3776 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 3777 _refs_reached_limit = _real_refs_reached_limit; | |
| 3778 } | |
| 3779 | |
| 3780 void CMTask::decrease_limits() { | |
| 3781 // This is called when we believe that we're going to do an infrequent | |
| 3782 // operation which will increase the per byte scanned cost (i.e. move | |
| 3783 // entries to/from the global stack). It basically tries to decrease the | |
| 3784 // scanning limit so that the clock is called earlier. | |
| 3785 | |
|
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3786 if (_cm->verbose_medium()) { |
| 342 | 3787 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
|
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3788 } |
| 342 | 3789 |
| 3790 _words_scanned_limit = _real_words_scanned_limit - | |
| 3791 3 * words_scanned_period / 4; | |
| 3792 _refs_reached_limit = _real_refs_reached_limit - | |
| 3793 3 * refs_reached_period / 4; | |
| 3794 } | |
| 3795 | |
| 3796 void CMTask::move_entries_to_global_stack() { | |
| 3797 // local array where we'll store the entries that will be popped | |
| 3798 // from the local queue | |
| 3799 oop buffer[global_stack_transfer_size]; | |
| 3800 | |
| 3801 int n = 0; | |
| 3802 oop obj; | |
| 3803 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 3804 buffer[n] = obj; | |
| 3805 ++n; | |
| 3806 } | |
| 3807 | |
| 3808 if (n > 0) { | |
| 3809 // we popped at least one entry from the local queue | |
| 3810 | |
| 3811 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 3812 | |
| 3813 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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3814 if (_cm->verbose_low()) { |
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3815 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
|
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3816 _task_id); |
|
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3817 } |
| 342 | 3818 set_has_aborted(); |
| 3819 } else { | |
| 3820 // the transfer was successful | |
| 3821 | |
|
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3822 if (_cm->verbose_medium()) { |
| 342 | 3823 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
| 3824 _task_id, n); | |
|
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3825 } |
| 342 | 3826 statsOnly( int tmp_size = _cm->mark_stack_size(); |
|
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3827 if (tmp_size > _global_max_size) { |
| 342 | 3828 _global_max_size = tmp_size; |
|
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3829 } |
| 342 | 3830 _global_pushes += n ); |
| 3831 } | |
| 3832 } | |
| 3833 | |
| 3834 // this operation was quite expensive, so decrease the limits | |
| 3835 decrease_limits(); | |
| 3836 } | |
| 3837 | |
| 3838 void CMTask::get_entries_from_global_stack() { | |
| 3839 // local array where we'll store the entries that will be popped | |
| 3840 // from the global stack. | |
| 3841 oop buffer[global_stack_transfer_size]; | |
| 3842 int n; | |
| 3843 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
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3844 assert(n <= global_stack_transfer_size, |
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3845 "we should not pop more than the given limit"); |
| 342 | 3846 if (n > 0) { |
| 3847 // yes, we did actually pop at least one entry | |
| 3848 | |
| 3849 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
|
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3850 if (_cm->verbose_medium()) { |
| 342 | 3851 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
| 3852 _task_id, n); | |
|
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3853 } |
| 342 | 3854 for (int i = 0; i < n; ++i) { |
| 3855 bool success = _task_queue->push(buffer[i]); | |
| 3856 // We only call this when the local queue is empty or under a | |
| 3857 // given target limit. So, we do not expect this push to fail. | |
|
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3858 assert(success, "invariant"); |
| 342 | 3859 } |
| 3860 | |
| 3861 statsOnly( int tmp_size = _task_queue->size(); | |
|
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3862 if (tmp_size > _local_max_size) { |
| 342 | 3863 _local_max_size = tmp_size; |
|
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|
3864 } |
| 342 | 3865 _local_pushes += n ); |
| 3866 } | |
| 3867 | |
| 3868 // this operation was quite expensive, so decrease the limits | |
| 3869 decrease_limits(); | |
| 3870 } | |
| 3871 | |
| 3872 void CMTask::drain_local_queue(bool partially) { | |
|
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3873 if (has_aborted()) return; |
| 342 | 3874 |
| 3875 // Decide what the target size is, depending whether we're going to | |
| 3876 // drain it partially (so that other tasks can steal if they run out | |
| 3877 // of things to do) or totally (at the very end). | |
| 3878 size_t target_size; | |
|
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3879 if (partially) { |
| 342 | 3880 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
|
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3881 } else { |
| 342 | 3882 target_size = 0; |
|
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3883 } |
| 342 | 3884 |
| 3885 if (_task_queue->size() > target_size) { | |
|
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3886 if (_cm->verbose_high()) { |
| 342 | 3887 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
| 3888 _task_id, target_size); | |
|
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3889 } |
| 342 | 3890 |
| 3891 oop obj; | |
| 3892 bool ret = _task_queue->pop_local(obj); | |
| 3893 while (ret) { | |
| 3894 statsOnly( ++_local_pops ); | |
| 3895 | |
|
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3896 if (_cm->verbose_high()) { |
| 342 | 3897 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
| 3898 (void*) obj); | |
|
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3899 } |
| 342 | 3900 |
|
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3901 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 3902 assert(!_g1h->is_on_master_free_list( |
| 2152 | 3903 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 3904 |
| 3905 scan_object(obj); | |
| 3906 | |
|
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3907 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 3908 ret = false; |
|
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3909 } else { |
| 342 | 3910 ret = _task_queue->pop_local(obj); |
|
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3911 } |
| 342 | 3912 } |
| 3913 | |
|
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3914 if (_cm->verbose_high()) { |
| 342 | 3915 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
| 3916 _task_id, _task_queue->size()); | |
|
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3917 } |
| 342 | 3918 } |
| 3919 } | |
| 3920 | |
| 3921 void CMTask::drain_global_stack(bool partially) { | |
|
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3922 if (has_aborted()) return; |
| 342 | 3923 |
| 3924 // We have a policy to drain the local queue before we attempt to | |
| 3925 // drain the global stack. | |
|
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3926 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 3927 |
| 3928 // Decide what the target size is, depending whether we're going to | |
| 3929 // drain it partially (so that other tasks can steal if they run out | |
| 3930 // of things to do) or totally (at the very end). Notice that, | |
| 3931 // because we move entries from the global stack in chunks or | |
| 3932 // because another task might be doing the same, we might in fact | |
| 3933 // drop below the target. But, this is not a problem. | |
| 3934 size_t target_size; | |
|
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3935 if (partially) { |
| 342 | 3936 target_size = _cm->partial_mark_stack_size_target(); |
|
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3937 } else { |
| 342 | 3938 target_size = 0; |
|
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3939 } |
| 342 | 3940 |
| 3941 if (_cm->mark_stack_size() > target_size) { | |
|
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3942 if (_cm->verbose_low()) { |
| 342 | 3943 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
| 3944 _task_id, target_size); | |
|
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3945 } |
| 342 | 3946 |
| 3947 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 3948 get_entries_from_global_stack(); | |
| 3949 drain_local_queue(partially); | |
| 3950 } | |
| 3951 | |
|
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3952 if (_cm->verbose_low()) { |
| 342 | 3953 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
| 3954 _task_id, _cm->mark_stack_size()); | |
|
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3955 } |
| 342 | 3956 } |
| 3957 } | |
| 3958 | |
| 3959 // SATB Queue has several assumptions on whether to call the par or | |
| 3960 // non-par versions of the methods. this is why some of the code is | |
| 3961 // replicated. We should really get rid of the single-threaded version | |
| 3962 // of the code to simplify things. | |
| 3963 void CMTask::drain_satb_buffers() { | |
|
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3964 if (has_aborted()) return; |
| 342 | 3965 |
| 3966 // We set this so that the regular clock knows that we're in the | |
| 3967 // middle of draining buffers and doesn't set the abort flag when it | |
| 3968 // notices that SATB buffers are available for draining. It'd be | |
| 3969 // very counter productive if it did that. :-) | |
| 3970 _draining_satb_buffers = true; | |
| 3971 | |
| 3972 CMObjectClosure oc(this); | |
| 3973 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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3974 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3975 satb_mq_set.set_par_closure(_task_id, &oc); |
|
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|
3976 } else { |
| 342 | 3977 satb_mq_set.set_closure(&oc); |
|
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3978 } |
| 342 | 3979 |
| 3980 // This keeps claiming and applying the closure to completed buffers | |
| 3981 // until we run out of buffers or we need to abort. | |
|
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|
3982 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3983 while (!has_aborted() && |
| 3984 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
|
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3985 if (_cm->verbose_medium()) { |
| 342 | 3986 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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3987 } |
| 342 | 3988 statsOnly( ++_satb_buffers_processed ); |
| 3989 regular_clock_call(); | |
| 3990 } | |
| 3991 } else { | |
| 3992 while (!has_aborted() && | |
| 3993 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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3994 if (_cm->verbose_medium()) { |
| 342 | 3995 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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3996 } |
| 342 | 3997 statsOnly( ++_satb_buffers_processed ); |
| 3998 regular_clock_call(); | |
| 3999 } | |
| 4000 } | |
| 4001 | |
| 4002 if (!concurrent() && !has_aborted()) { | |
| 4003 // We should only do this during remark. | |
|
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4004 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4005 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
|
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|
4006 } else { |
| 342 | 4007 satb_mq_set.iterate_closure_all_threads(); |
|
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|
4008 } |
| 342 | 4009 } |
| 4010 | |
| 4011 _draining_satb_buffers = false; | |
| 4012 | |
|
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|
4013 assert(has_aborted() || |
|
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|
4014 concurrent() || |
|
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4015 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 4016 |
|
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|
4017 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4018 satb_mq_set.set_par_closure(_task_id, NULL); |
|
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4019 } else { |
| 342 | 4020 satb_mq_set.set_closure(NULL); |
|
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4021 } |
| 342 | 4022 |
| 4023 // again, this was a potentially expensive operation, decrease the | |
| 4024 // limits to get the regular clock call early | |
| 4025 decrease_limits(); | |
| 4026 } | |
| 4027 | |
| 4028 void CMTask::drain_region_stack(BitMapClosure* bc) { | |
|
4787
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|
4029 assert(_cm->region_stack_empty(), "region stack should be empty"); |
|
2ace1c4ee8da
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4030 assert(_aborted_region.is_empty(), "aborted region should be empty"); |
|
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4031 return; |
|
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|
4032 |
|
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|
4033 if (has_aborted()) return; |
| 342 | 4034 |
|
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|
4035 assert(_region_finger == NULL, |
|
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|
4036 "it should be NULL when we're not scanning a region"); |
| 342 | 4037 |
|
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|
4038 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
|
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4039 if (_cm->verbose_low()) { |
| 342 | 4040 gclog_or_tty->print_cr("[%d] draining region stack, size = %d", |
| 4041 _task_id, _cm->region_stack_size()); | |
|
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4042 } |
| 342 | 4043 |
|
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|
4044 MemRegion mr; |
|
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4045 |
|
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|
4046 if (!_aborted_region.is_empty()) { |
|
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4047 mr = _aborted_region; |
|
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4048 _aborted_region = MemRegion(); |
|
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4049 |
|
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4050 if (_cm->verbose_low()) { |
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4051 gclog_or_tty->print_cr("[%d] scanning aborted region " |
|
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4052 "[ " PTR_FORMAT ", " PTR_FORMAT " )", |
|
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4053 _task_id, mr.start(), mr.end()); |
|
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4054 } |
|
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4055 } else { |
|
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|
4056 mr = _cm->region_stack_pop_lock_free(); |
|
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4057 // it returns MemRegion() if the pop fails |
|
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|
4058 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
|
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|
4059 } |
| 342 | 4060 |
| 4061 while (mr.start() != NULL) { | |
|
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4062 if (_cm->verbose_medium()) { |
| 342 | 4063 gclog_or_tty->print_cr("[%d] we are scanning region " |
| 4064 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 4065 _task_id, mr.start(), mr.end()); | |
|
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|
4066 } |
|
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|
4067 |
|
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4068 assert(mr.end() <= _cm->finger(), |
|
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|
4069 "otherwise the region shouldn't be on the stack"); |
| 342 | 4070 assert(!mr.is_empty(), "Only non-empty regions live on the region stack"); |
| 4071 if (_nextMarkBitMap->iterate(bc, mr)) { | |
|
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|
4072 assert(!has_aborted(), |
|
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|
4073 "cannot abort the task without aborting the bitmap iteration"); |
| 342 | 4074 |
| 4075 // We finished iterating over the region without aborting. | |
| 4076 regular_clock_call(); | |
|
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|
4077 if (has_aborted()) { |
| 342 | 4078 mr = MemRegion(); |
|
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|
4079 } else { |
|
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|
4080 mr = _cm->region_stack_pop_lock_free(); |
| 342 | 4081 // it returns MemRegion() if the pop fails |
| 4082 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); | |
| 4083 } | |
| 4084 } else { | |
|
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|
4085 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4086 |
| 4087 // The only way to abort the bitmap iteration is to return | |
| 4088 // false from the do_bit() method. However, inside the | |
| 4089 // do_bit() method we move the _region_finger to point to the | |
| 4090 // object currently being looked at. So, if we bail out, we | |
| 4091 // have definitely set _region_finger to something non-null. | |
|
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|
4092 assert(_region_finger != NULL, "invariant"); |
| 342 | 4093 |
|
1835
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|
4094 // Make sure that any previously aborted region has been |
|
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|
4095 // cleared. |
|
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|
4096 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
|
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|
4097 |
| 342 | 4098 // The iteration was actually aborted. So now _region_finger |
| 4099 // points to the address of the object we last scanned. If we | |
| 4100 // leave it there, when we restart this task, we will rescan | |
| 4101 // the object. It is easy to avoid this. We move the finger by | |
| 4102 // enough to point to the next possible object header (the | |
| 4103 // bitmap knows by how much we need to move it as it knows its | |
| 4104 // granularity). | |
| 4105 MemRegion newRegion = | |
| 4106 MemRegion(_nextMarkBitMap->nextWord(_region_finger), mr.end()); | |
| 4107 | |
| 4108 if (!newRegion.is_empty()) { | |
| 4109 if (_cm->verbose_low()) { | |
|
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|
4110 gclog_or_tty->print_cr("[%d] recording unscanned region" |
|
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|
4111 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
| 342 | 4112 _task_id, |
| 4113 newRegion.start(), newRegion.end()); | |
| 4114 } | |
|
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|
4115 // Now record the part of the region we didn't scan to |
|
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|
4116 // make sure this task scans it later. |
|
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|
4117 _aborted_region = newRegion; |
| 342 | 4118 } |
| 4119 // break from while | |
| 4120 mr = MemRegion(); | |
| 4121 } | |
| 4122 _region_finger = NULL; | |
| 4123 } | |
| 4124 | |
|
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|
4125 if (_cm->verbose_low()) { |
| 342 | 4126 gclog_or_tty->print_cr("[%d] drained region stack, size = %d", |
| 4127 _task_id, _cm->region_stack_size()); | |
|
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|
4128 } |
| 342 | 4129 } |
| 4130 } | |
| 4131 | |
| 4132 void CMTask::print_stats() { | |
| 4133 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
| 4134 _task_id, _calls); | |
| 4135 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
| 4136 _elapsed_time_ms, _termination_time_ms); | |
| 4137 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4138 _step_times_ms.num(), _step_times_ms.avg(), | |
| 4139 _step_times_ms.sd()); | |
| 4140 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4141 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 4142 | |
| 4143 #if _MARKING_STATS_ | |
| 4144 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4145 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 4146 _all_clock_intervals_ms.sd()); | |
| 4147 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4148 _all_clock_intervals_ms.maximum(), | |
| 4149 _all_clock_intervals_ms.sum()); | |
| 4150 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 4151 _clock_due_to_scanning, _clock_due_to_marking); | |
| 4152 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 4153 _objs_scanned, _objs_found_on_bitmap); | |
| 4154 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 4155 _local_pushes, _local_pops, _local_max_size); | |
| 4156 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 4157 _global_pushes, _global_pops, _global_max_size); | |
| 4158 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 4159 _global_transfers_to,_global_transfers_from); | |
| 4160 gclog_or_tty->print_cr(" Regions: claimed = %d, Region Stack: pops = %d", | |
| 4161 _regions_claimed, _region_stack_pops); | |
| 4162 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); | |
| 4163 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 4164 _steal_attempts, _steals); | |
| 4165 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 4166 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 4167 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 4168 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 4169 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 4170 #endif // _MARKING_STATS_ | |
| 4171 } | |
| 4172 | |
| 4173 /***************************************************************************** | |
| 4174 | |
| 4175 The do_marking_step(time_target_ms) method is the building block | |
| 4176 of the parallel marking framework. It can be called in parallel | |
| 4177 with other invocations of do_marking_step() on different tasks | |
| 4178 (but only one per task, obviously) and concurrently with the | |
| 4179 mutator threads, or during remark, hence it eliminates the need | |
| 4180 for two versions of the code. When called during remark, it will | |
| 4181 pick up from where the task left off during the concurrent marking | |
| 4182 phase. Interestingly, tasks are also claimable during evacuation | |
| 4183 pauses too, since do_marking_step() ensures that it aborts before | |
| 4184 it needs to yield. | |
| 4185 | |
| 4186 The data structures that is uses to do marking work are the | |
| 4187 following: | |
| 4188 | |
| 4189 (1) Marking Bitmap. If there are gray objects that appear only | |
| 4190 on the bitmap (this happens either when dealing with an overflow | |
| 4191 or when the initial marking phase has simply marked the roots | |
| 4192 and didn't push them on the stack), then tasks claim heap | |
| 4193 regions whose bitmap they then scan to find gray objects. A | |
| 4194 global finger indicates where the end of the last claimed region | |
| 4195 is. A local finger indicates how far into the region a task has | |
| 4196 scanned. The two fingers are used to determine how to gray an | |
| 4197 object (i.e. whether simply marking it is OK, as it will be | |
| 4198 visited by a task in the future, or whether it needs to be also | |
| 4199 pushed on a stack). | |
| 4200 | |
| 4201 (2) Local Queue. The local queue of the task which is accessed | |
| 4202 reasonably efficiently by the task. Other tasks can steal from | |
| 4203 it when they run out of work. Throughout the marking phase, a | |
| 4204 task attempts to keep its local queue short but not totally | |
| 4205 empty, so that entries are available for stealing by other | |
| 4206 tasks. Only when there is no more work, a task will totally | |
| 4207 drain its local queue. | |
| 4208 | |
| 4209 (3) Global Mark Stack. This handles local queue overflow. During | |
| 4210 marking only sets of entries are moved between it and the local | |
| 4211 queues, as access to it requires a mutex and more fine-grain | |
| 4212 interaction with it which might cause contention. If it | |
| 4213 overflows, then the marking phase should restart and iterate | |
| 4214 over the bitmap to identify gray objects. Throughout the marking | |
| 4215 phase, tasks attempt to keep the global mark stack at a small | |
| 4216 length but not totally empty, so that entries are available for | |
| 4217 popping by other tasks. Only when there is no more work, tasks | |
| 4218 will totally drain the global mark stack. | |
| 4219 | |
| 4220 (4) Global Region Stack. Entries on it correspond to areas of | |
| 4221 the bitmap that need to be scanned since they contain gray | |
| 4222 objects. Pushes on the region stack only happen during | |
| 4223 evacuation pauses and typically correspond to areas covered by | |
| 4224 GC LABS. If it overflows, then the marking phase should restart | |
| 4225 and iterate over the bitmap to identify gray objects. Tasks will | |
| 4226 try to totally drain the region stack as soon as possible. | |
| 4227 | |
| 4228 (5) SATB Buffer Queue. This is where completed SATB buffers are | |
| 4229 made available. Buffers are regularly removed from this queue | |
| 4230 and scanned for roots, so that the queue doesn't get too | |
| 4231 long. During remark, all completed buffers are processed, as | |
| 4232 well as the filled in parts of any uncompleted buffers. | |
| 4233 | |
| 4234 The do_marking_step() method tries to abort when the time target | |
| 4235 has been reached. There are a few other cases when the | |
| 4236 do_marking_step() method also aborts: | |
| 4237 | |
| 4238 (1) When the marking phase has been aborted (after a Full GC). | |
| 4239 | |
| 4240 (2) When a global overflow (either on the global stack or the | |
| 4241 region stack) has been triggered. Before the task aborts, it | |
| 4242 will actually sync up with the other tasks to ensure that all | |
| 4243 the marking data structures (local queues, stacks, fingers etc.) | |
| 4244 are re-initialised so that when do_marking_step() completes, | |
| 4245 the marking phase can immediately restart. | |
| 4246 | |
| 4247 (3) When enough completed SATB buffers are available. The | |
| 4248 do_marking_step() method only tries to drain SATB buffers right | |
| 4249 at the beginning. So, if enough buffers are available, the | |
| 4250 marking step aborts and the SATB buffers are processed at | |
| 4251 the beginning of the next invocation. | |
| 4252 | |
| 4253 (4) To yield. when we have to yield then we abort and yield | |
| 4254 right at the end of do_marking_step(). This saves us from a lot | |
| 4255 of hassle as, by yielding we might allow a Full GC. If this | |
| 4256 happens then objects will be compacted underneath our feet, the | |
| 4257 heap might shrink, etc. We save checking for this by just | |
| 4258 aborting and doing the yield right at the end. | |
| 4259 | |
| 4260 From the above it follows that the do_marking_step() method should | |
| 4261 be called in a loop (or, otherwise, regularly) until it completes. | |
| 4262 | |
| 4263 If a marking step completes without its has_aborted() flag being | |
| 4264 true, it means it has completed the current marking phase (and | |
| 4265 also all other marking tasks have done so and have all synced up). | |
| 4266 | |
| 4267 A method called regular_clock_call() is invoked "regularly" (in | |
| 4268 sub ms intervals) throughout marking. It is this clock method that | |
| 4269 checks all the abort conditions which were mentioned above and | |
| 4270 decides when the task should abort. A work-based scheme is used to | |
| 4271 trigger this clock method: when the number of object words the | |
| 4272 marking phase has scanned or the number of references the marking | |
| 4273 phase has visited reach a given limit. Additional invocations to | |
| 4274 the method clock have been planted in a few other strategic places | |
| 4275 too. The initial reason for the clock method was to avoid calling | |
| 4276 vtime too regularly, as it is quite expensive. So, once it was in | |
| 4277 place, it was natural to piggy-back all the other conditions on it | |
| 4278 too and not constantly check them throughout the code. | |
| 4279 | |
| 4280 *****************************************************************************/ | |
| 4281 | |
|
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4282 void CMTask::do_marking_step(double time_target_ms, |
|
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|
4283 bool do_stealing, |
|
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|
4284 bool do_termination) { |
|
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|
4285 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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|
4286 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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|
4287 |
|
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4288 assert(concurrent() || _cm->region_stack_empty(), |
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|
4289 "the region stack should have been cleared before remark"); |
|
1835
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|
4290 assert(concurrent() || !_cm->has_aborted_regions(), |
|
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|
4291 "aborted regions should have been cleared before remark"); |
|
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|
4292 assert(_region_finger == NULL, |
|
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|
4293 "this should be non-null only when a region is being scanned"); |
| 342 | 4294 |
| 4295 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
|
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|
4296 assert(_task_queues != NULL, "invariant"); |
|
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|
4297 assert(_task_queue != NULL, "invariant"); |
|
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|
4298 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
|
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|
4299 |
|
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|
4300 assert(!_claimed, |
|
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|
4301 "only one thread should claim this task at any one time"); |
| 342 | 4302 |
| 4303 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 4304 // possible for two threads to set the _claimed flag at the same | |
| 4305 // time. But it is only for debugging purposes anyway and it will | |
| 4306 // catch most problems. | |
| 4307 _claimed = true; | |
| 4308 | |
| 4309 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4310 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 4311 | |
| 4312 double diff_prediction_ms = | |
| 4313 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 4314 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 4315 | |
| 4316 // set up the variables that are used in the work-based scheme to | |
| 4317 // call the regular clock method | |
| 4318 _words_scanned = 0; | |
| 4319 _refs_reached = 0; | |
| 4320 recalculate_limits(); | |
| 4321 | |
| 4322 // clear all flags | |
| 4323 clear_has_aborted(); | |
|
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|
4324 _has_timed_out = false; |
| 342 | 4325 _draining_satb_buffers = false; |
| 4326 | |
| 4327 ++_calls; | |
| 4328 | |
|
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|
4329 if (_cm->verbose_low()) { |
| 342 | 4330 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
| 4331 "target = %1.2lfms >>>>>>>>>>", | |
| 4332 _task_id, _calls, _time_target_ms); | |
|
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|
4333 } |
| 342 | 4334 |
| 4335 // Set up the bitmap and oop closures. Anything that uses them is | |
| 4336 // eventually called from this method, so it is OK to allocate these | |
| 4337 // statically. | |
| 4338 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 4339 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 4340 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 4341 |
| 4342 if (_cm->has_overflown()) { | |
| 4343 // This can happen if the region stack or the mark stack overflows | |
| 4344 // during a GC pause and this task, after a yield point, | |
| 4345 // restarts. We have to abort as we need to get into the overflow | |
| 4346 // protocol which happens right at the end of this task. | |
| 4347 set_has_aborted(); | |
| 4348 } | |
| 4349 | |
| 4350 // First drain any available SATB buffers. After this, we will not | |
| 4351 // look at SATB buffers before the next invocation of this method. | |
| 4352 // If enough completed SATB buffers are queued up, the regular clock | |
| 4353 // will abort this task so that it restarts. | |
| 4354 drain_satb_buffers(); | |
| 4355 // ...then partially drain the local queue and the global stack | |
| 4356 drain_local_queue(true); | |
| 4357 drain_global_stack(true); | |
| 4358 | |
| 4359 // Then totally drain the region stack. We will not look at | |
| 4360 // it again before the next invocation of this method. Entries on | |
| 4361 // the region stack are only added during evacuation pauses, for | |
| 4362 // which we have to yield. When we do, we abort the task anyway so | |
| 4363 // it will look at the region stack again when it restarts. | |
| 4364 bitmap_closure.set_scanning_heap_region(false); | |
| 4365 drain_region_stack(&bitmap_closure); | |
| 4366 // ...then partially drain the local queue and the global stack | |
| 4367 drain_local_queue(true); | |
| 4368 drain_global_stack(true); | |
| 4369 | |
| 4370 do { | |
| 4371 if (!has_aborted() && _curr_region != NULL) { | |
| 4372 // This means that we're already holding on to a region. | |
|
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|
4373 assert(_finger != NULL, "if region is not NULL, then the finger " |
|
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|
4374 "should not be NULL either"); |
| 342 | 4375 |
| 4376 // We might have restarted this task after an evacuation pause | |
| 4377 // which might have evacuated the region we're holding on to | |
| 4378 // underneath our feet. Let's read its limit again to make sure | |
| 4379 // that we do not iterate over a region of the heap that | |
| 4380 // contains garbage (update_region_limit() will also move | |
| 4381 // _finger to the start of the region if it is found empty). | |
| 4382 update_region_limit(); | |
| 4383 // We will start from _finger not from the start of the region, | |
| 4384 // as we might be restarting this task after aborting half-way | |
| 4385 // through scanning this region. In this case, _finger points to | |
| 4386 // the address where we last found a marked object. If this is a | |
| 4387 // fresh region, _finger points to start(). | |
| 4388 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 4389 | |
|
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|
4390 if (_cm->verbose_low()) { |
| 342 | 4391 gclog_or_tty->print_cr("[%d] we're scanning part " |
| 4392 "["PTR_FORMAT", "PTR_FORMAT") " | |
| 4393 "of region "PTR_FORMAT, | |
| 4394 _task_id, _finger, _region_limit, _curr_region); | |
|
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|
4395 } |
| 342 | 4396 |
| 4397 // Let's iterate over the bitmap of the part of the | |
| 4398 // region that is left. | |
| 4399 bitmap_closure.set_scanning_heap_region(true); | |
| 4400 if (mr.is_empty() || | |
| 4401 _nextMarkBitMap->iterate(&bitmap_closure, mr)) { | |
| 4402 // We successfully completed iterating over the region. Now, | |
| 4403 // let's give up the region. | |
| 4404 giveup_current_region(); | |
| 4405 regular_clock_call(); | |
| 4406 } else { | |
|
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|
4407 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4408 // The only way to abort the bitmap iteration is to return |
| 4409 // false from the do_bit() method. However, inside the | |
| 4410 // do_bit() method we move the _finger to point to the | |
| 4411 // object currently being looked at. So, if we bail out, we | |
| 4412 // have definitely set _finger to something non-null. | |
|
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|
4413 assert(_finger != NULL, "invariant"); |
| 342 | 4414 |
| 4415 // Region iteration was actually aborted. So now _finger | |
| 4416 // points to the address of the object we last scanned. If we | |
| 4417 // leave it there, when we restart this task, we will rescan | |
| 4418 // the object. It is easy to avoid this. We move the finger by | |
| 4419 // enough to point to the next possible object header (the | |
| 4420 // bitmap knows by how much we need to move it as it knows its | |
| 4421 // granularity). | |
|
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|
4422 assert(_finger < _region_limit, "invariant"); |
|
3f0549ed0c98
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|
4423 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
|
3f0549ed0c98
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|
4424 // Check if bitmap iteration was aborted while scanning the last object |
|
3f0549ed0c98
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|
4425 if (new_finger >= _region_limit) { |
|
3f0549ed0c98
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|
4426 giveup_current_region(); |
|
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|
4427 } else { |
|
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|
4428 move_finger_to(new_finger); |
|
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|
4429 } |
| 342 | 4430 } |
| 4431 } | |
| 4432 // At this point we have either completed iterating over the | |
| 4433 // region we were holding on to, or we have aborted. | |
| 4434 | |
| 4435 // We then partially drain the local queue and the global stack. | |
| 4436 // (Do we really need this?) | |
| 4437 drain_local_queue(true); | |
| 4438 drain_global_stack(true); | |
| 4439 | |
| 4440 // Read the note on the claim_region() method on why it might | |
| 4441 // return NULL with potentially more regions available for | |
| 4442 // claiming and why we have to check out_of_regions() to determine | |
| 4443 // whether we're done or not. | |
| 4444 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 4445 // We are going to try to claim a new region. We should have | |
| 4446 // given up on the previous one. | |
|
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|
4447 // Separated the asserts so that we know which one fires. |
|
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|
4448 assert(_curr_region == NULL, "invariant"); |
|
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|
4449 assert(_finger == NULL, "invariant"); |
|
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|
4450 assert(_region_limit == NULL, "invariant"); |
|
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|
4451 if (_cm->verbose_low()) { |
| 342 | 4452 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
|
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|
4453 } |
| 342 | 4454 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
| 4455 if (claimed_region != NULL) { | |
| 4456 // Yes, we managed to claim one | |
| 4457 statsOnly( ++_regions_claimed ); | |
| 4458 | |
|
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|
4459 if (_cm->verbose_low()) { |
| 342 | 4460 gclog_or_tty->print_cr("[%d] we successfully claimed " |
| 4461 "region "PTR_FORMAT, | |
| 4462 _task_id, claimed_region); | |
|
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|
4463 } |
| 342 | 4464 |
| 4465 setup_for_region(claimed_region); | |
|
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|
4466 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 4467 } |
| 4468 // It is important to call the regular clock here. It might take | |
| 4469 // a while to claim a region if, for example, we hit a large | |
| 4470 // block of empty regions. So we need to call the regular clock | |
| 4471 // method once round the loop to make sure it's called | |
| 4472 // frequently enough. | |
| 4473 regular_clock_call(); | |
| 4474 } | |
| 4475 | |
| 4476 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
4477 assert(_cm->out_of_regions(), |
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|
4478 "at this point we should be out of regions"); |
| 342 | 4479 } |
| 4480 } while ( _curr_region != NULL && !has_aborted()); | |
| 4481 | |
| 4482 if (!has_aborted()) { | |
| 4483 // We cannot check whether the global stack is empty, since other | |
|
343
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diff
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|
4484 // tasks might be pushing objects to it concurrently. We also cannot |
|
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diff
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|
4485 // check if the region stack is empty because if a thread is aborting |
|
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diff
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|
4486 // it can push a partially done region back. |
|
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|
4487 assert(_cm->out_of_regions(), |
|
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|
4488 "at this point we should be out of regions"); |
| 342 | 4489 |
|
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|
4490 if (_cm->verbose_low()) { |
| 342 | 4491 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
|
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|
4492 } |
| 342 | 4493 |
| 4494 // Try to reduce the number of available SATB buffers so that | |
| 4495 // remark has less work to do. | |
| 4496 drain_satb_buffers(); | |
| 4497 } | |
| 4498 | |
| 4499 // Since we've done everything else, we can now totally drain the | |
| 4500 // local queue and global stack. | |
| 4501 drain_local_queue(false); | |
| 4502 drain_global_stack(false); | |
| 4503 | |
| 4504 // Attempt at work stealing from other task's queues. | |
|
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|
4505 if (do_stealing && !has_aborted()) { |
| 342 | 4506 // We have not aborted. This means that we have finished all that |
| 4507 // we could. Let's try to do some stealing... | |
| 4508 | |
| 4509 // We cannot check whether the global stack is empty, since other | |
|
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
changeset
|
4510 // 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
|
4511 // 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
|
4512 // it can push a partially done region back. |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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1022
diff
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|
4513 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
11d4857fe5e1
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diff
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|
4514 "only way to reach here"); |
| 342 | 4515 |
|
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|
4516 if (_cm->verbose_low()) { |
| 342 | 4517 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
|
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7055073: G1: code cleanup in the concurrentMark.* files
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|
4518 } |
| 342 | 4519 |
| 4520 while (!has_aborted()) { | |
| 4521 oop obj; | |
| 4522 statsOnly( ++_steal_attempts ); | |
| 4523 | |
| 4524 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
|
3776
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diff
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|
4525 if (_cm->verbose_medium()) { |
| 342 | 4526 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
| 4527 _task_id, (void*) obj); | |
|
3776
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|
4528 } |
| 342 | 4529 |
| 4530 statsOnly( ++_steals ); | |
| 4531 | |
|
1023
11d4857fe5e1
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diff
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|
4532 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
11d4857fe5e1
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|
4533 "any stolen object should be marked"); |
| 342 | 4534 scan_object(obj); |
| 4535 | |
| 4536 // And since we're towards the end, let's totally drain the | |
| 4537 // local queue and global stack. | |
| 4538 drain_local_queue(false); | |
| 4539 drain_global_stack(false); | |
| 4540 } else { | |
| 4541 break; | |
| 4542 } | |
| 4543 } | |
| 4544 } | |
| 4545 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
4546 // 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:
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diff
changeset
|
4547 // should raise the overflow flag. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
4548 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
|
4549 if (_cm->force_overflow()->should_force()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
4550 _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
|
4551 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
|
4552 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
4553 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4554 |
| 342 | 4555 // We still haven't aborted. Now, let's try to get into the |
| 4556 // termination protocol. | |
|
2174
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6608385: G1: need to support parallel reference processing
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|
4557 if (do_termination && !has_aborted()) { |
| 342 | 4558 // We cannot check whether the global stack is empty, since other |
|
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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342
diff
changeset
|
4559 // tasks might be concurrently pushing objects on it. We also cannot |
|
afc1ce1efe66
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diff
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|
4560 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
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diff
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|
4561 // it can push a partially done region back. |
|
1023
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changeset
|
4562 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
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tonyp
parents:
1022
diff
changeset
|
4563 assert(_cm->out_of_regions(), "only way to reach here"); |
|
11d4857fe5e1
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1022
diff
changeset
|
4564 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 4565 |
|
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|
4566 if (_cm->verbose_low()) { |
| 342 | 4567 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
|
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|
4568 } |
| 342 | 4569 |
| 4570 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4571 // The CMTask class also extends the TerminatorTerminator class, | |
| 4572 // hence its should_exit_termination() method will also decide | |
| 4573 // whether to exit the termination protocol or not. | |
| 4574 bool finished = _cm->terminator()->offer_termination(this); | |
| 4575 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
| 4576 _termination_time_ms += | |
| 4577 termination_end_time_ms - _termination_start_time_ms; | |
| 4578 | |
| 4579 if (finished) { | |
| 4580 // We're all done. | |
| 4581 | |
| 4582 if (_task_id == 0) { | |
| 4583 // let's allow task 0 to do this | |
| 4584 if (concurrent()) { | |
|
1023
11d4857fe5e1
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tonyp
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changeset
|
4585 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 4586 // we need to set this to false before the next |
| 4587 // safepoint. This way we ensure that the marking phase | |
| 4588 // doesn't observe any more heap expansions. | |
| 4589 _cm->clear_concurrent_marking_in_progress(); | |
| 4590 } | |
| 4591 } | |
| 4592 | |
| 4593 // We can now guarantee that the global stack is empty, since | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4594 // all other tasks have finished. We separated the guarantees so |
|
11d4857fe5e1
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1022
diff
changeset
|
4595 // that, if a condition is false, we can immediately find out |
|
11d4857fe5e1
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parents:
1022
diff
changeset
|
4596 // which one. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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1022
diff
changeset
|
4597 guarantee(_cm->out_of_regions(), "only way to reach here"); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4598 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4599 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
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tonyp
parents:
1022
diff
changeset
|
4600 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
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tonyp
parents:
1022
diff
changeset
|
4601 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
11d4857fe5e1
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tonyp
parents:
1022
diff
changeset
|
4602 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4603 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
changeset
|
4604 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
| 342 | 4605 |
|
3776
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diff
changeset
|
4606 if (_cm->verbose_low()) { |
| 342 | 4607 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
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diff
changeset
|
4608 } |
| 342 | 4609 } else { |
| 4610 // Apparently there's more work to do. Let's abort this task. It | |
| 4611 // will restart it and we can hopefully find more things to do. | |
| 4612 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4613 if (_cm->verbose_low()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4614 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4615 _task_id); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4616 } |
| 342 | 4617 |
| 4618 set_has_aborted(); | |
| 4619 statsOnly( ++_aborted_termination ); | |
| 4620 } | |
| 4621 } | |
| 4622 | |
| 4623 // Mainly for debugging purposes to make sure that a pointer to the | |
| 4624 // closure which was statically allocated in this frame doesn't | |
| 4625 // escape it by accident. | |
| 3771 | 4626 set_cm_oop_closure(NULL); |
| 342 | 4627 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 4628 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 4629 // Update the step history. | |
| 4630 _step_times_ms.add(elapsed_time_ms); | |
| 4631 | |
| 4632 if (has_aborted()) { | |
| 4633 // The task was aborted for some reason. | |
| 4634 | |
| 4635 statsOnly( ++_aborted ); | |
| 4636 | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
4637 if (_has_timed_out) { |
| 342 | 4638 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 4639 // Keep statistics of how well we did with respect to hitting | |
| 4640 // our target only if we actually timed out (if we aborted for | |
| 4641 // other reasons, then the results might get skewed). | |
| 4642 _marking_step_diffs_ms.add(diff_ms); | |
| 4643 } | |
| 4644 | |
| 4645 if (_cm->has_overflown()) { | |
| 4646 // This is the interesting one. We aborted because a global | |
| 4647 // overflow was raised. This means we have to restart the | |
| 4648 // marking phase and start iterating over regions. However, in | |
| 4649 // order to do this we have to make sure that all tasks stop | |
| 4650 // what they are doing and re-initialise in a safe manner. We | |
| 4651 // will achieve this with the use of two barrier sync points. | |
| 4652 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
4653 if (_cm->verbose_low()) { |
| 342 | 4654 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4655 } |
| 342 | 4656 |
| 4657 _cm->enter_first_sync_barrier(_task_id); | |
| 4658 // When we exit this sync barrier we know that all tasks have | |
| 4659 // stopped doing marking work. So, it's now safe to | |
| 4660 // re-initialise our data structures. At the end of this method, | |
| 4661 // task 0 will clear the global data structures. | |
| 4662 | |
| 4663 statsOnly( ++_aborted_overflow ); | |
| 4664 | |
| 4665 // We clear the local state of this task... | |
| 4666 clear_region_fields(); | |
| 4667 | |
| 4668 // ...and enter the second barrier. | |
| 4669 _cm->enter_second_sync_barrier(_task_id); | |
| 4670 // At this point everything has bee re-initialised and we're | |
| 4671 // ready to restart. | |
| 4672 } | |
| 4673 | |
| 4674 if (_cm->verbose_low()) { | |
| 4675 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
| 4676 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4677 _task_id, _time_target_ms, elapsed_time_ms); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4678 if (_cm->has_aborted()) { |
| 342 | 4679 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
| 4680 _task_id); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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diff
changeset
|
4681 } |
| 342 | 4682 } |
| 4683 } else { | |
|
3776
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tonyp
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3772
diff
changeset
|
4684 if (_cm->verbose_low()) { |
| 342 | 4685 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 4686 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4687 _task_id, _time_target_ms, elapsed_time_ms); | |
|
3776
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tonyp
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3772
diff
changeset
|
4688 } |
| 342 | 4689 } |
| 4690 | |
| 4691 _claimed = false; | |
| 4692 } | |
| 4693 | |
| 4694 CMTask::CMTask(int task_id, | |
| 4695 ConcurrentMark* cm, | |
| 4696 CMTaskQueue* task_queue, | |
| 4697 CMTaskQueueSet* task_queues) | |
| 4698 : _g1h(G1CollectedHeap::heap()), | |
| 4699 _task_id(task_id), _cm(cm), | |
| 4700 _claimed(false), | |
| 4701 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 4702 _task_queue(task_queue), | |
| 4703 _task_queues(task_queues), | |
| 3771 | 4704 _cm_oop_closure(NULL), |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
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|
4705 _aborted_region(MemRegion()) { |
|
1023
11d4857fe5e1
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1022
diff
changeset
|
4706 guarantee(task_queue != NULL, "invariant"); |
|
11d4857fe5e1
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tonyp
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1022
diff
changeset
|
4707 guarantee(task_queues != NULL, "invariant"); |
| 342 | 4708 |
| 4709 statsOnly( _clock_due_to_scanning = 0; | |
| 4710 _clock_due_to_marking = 0 ); | |
| 4711 | |
| 4712 _marking_step_diffs_ms.add(0.5); | |
| 4713 } | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4714 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4715 // These are formatting macros that are used below to ensure |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4716 // consistent formatting. The *_H_* versions are used to format the |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4717 // header for a particular value and they should be kept consistent |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4718 // with the corresponding macro. Also note that most of the macros add |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4719 // the necessary white space (as a prefix) which makes them a bit |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4720 // easier to compose. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4721 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4722 // All the output lines are prefixed with this string to be able to |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4723 // identify them easily in a large log file. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4724 #define G1PPRL_LINE_PREFIX "###" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4725 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4726 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4727 #ifdef _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4728 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4729 #else // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4730 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4731 #endif // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4732 |
|
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
|
4733 // For per-region info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4734 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4735 #define G1PPRL_TYPE_H_FORMAT " %4s" |
|
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
|
4736 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4737 #define G1PPRL_BYTE_H_FORMAT " %9s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4738 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4739 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4740 |
|
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
|
4741 // For summary info |
|
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
|
4742 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4743 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4744 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4745 #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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diff
changeset
|
4746 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4747 G1PrintRegionLivenessInfoClosure:: |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4748 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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diff
changeset
|
4749 : _out(out), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4750 _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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changeset
|
4751 _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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|
4752 _hum_used_bytes(0), _hum_capacity_bytes(0), |
|
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|
4753 _hum_prev_live_bytes(0), _hum_next_live_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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changeset
|
4754 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4755 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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changeset
|
4756 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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|
4757 double now = os::elapsedTime(); |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4758 |
|
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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
|
4759 // Print the header of the output. |
|
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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
|
4760 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4761 _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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changeset
|
4762 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
|
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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
|
4763 G1PPRL_SUM_ADDR_FORMAT("committed") |
|
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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
|
4764 G1PPRL_SUM_ADDR_FORMAT("reserved") |
|
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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
|
4765 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4766 g1_committed.start(), g1_committed.end(), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4767 g1_reserved.start(), g1_reserved.end(), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4768 HeapRegion::GrainBytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4769 _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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changeset
|
4770 _out->print_cr(G1PPRL_LINE_PREFIX |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4771 G1PPRL_TYPE_H_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4772 G1PPRL_ADDR_BASE_H_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4773 G1PPRL_BYTE_H_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4774 G1PPRL_BYTE_H_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4775 G1PPRL_BYTE_H_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4776 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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changeset
|
4777 "type", "address-range", |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
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changeset
|
4778 "used", "prev-live", "next-live", "gc-eff"); |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4779 _out->print_cr(G1PPRL_LINE_PREFIX |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4780 G1PPRL_TYPE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
diff
changeset
|
4781 G1PPRL_ADDR_BASE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
diff
changeset
|
4782 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
diff
changeset
|
4783 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4784 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
changeset
|
4785 G1PPRL_DOUBLE_H_FORMAT, |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4786 "", "", |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4787 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4788 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4789 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4790 // 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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parents:
2369
diff
changeset
|
4791 // deduces the corresponding value for a region in a humongous region |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4792 // series (either the region size, or what's left if the _hum_* field |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4793 // is < the region size), and updates the _hum_* field accordingly. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4794 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4795 size_t bytes = 0; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4796 // The > 0 check is to deal with the prev and next live bytes which |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4797 // could be 0. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4798 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4799 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4800 *hum_bytes -= bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4801 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4802 return bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4803 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4804 |
|
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
|
4805 // 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
|
4806 // from the _hum_* fields and updates those accordingly. It assumes |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
4807 // 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
diff
changeset
|
4808 // 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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parents:
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diff
changeset
|
4809 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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diff
changeset
|
4810 size_t* 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
|
4811 size_t* 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
|
4812 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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parents:
2369
diff
changeset
|
4813 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4814 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4815 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4816 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4817 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4818 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4819 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4820 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4821 const char* type = ""; |
|
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
|
4822 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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2369
diff
changeset
|
4823 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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2369
diff
changeset
|
4824 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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2369
diff
changeset
|
4825 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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2369
diff
changeset
|
4826 size_t prev_live_bytes = r->live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4827 size_t next_live_bytes = r->next_live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4828 double gc_eff = r->gc_efficiency(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4829 if (r->used() == 0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4830 type = "FREE"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4831 } else if (r->is_survivor()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4832 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4833 } 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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2369
diff
changeset
|
4834 type = "EDEN"; |
|
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
|
4835 } else if (r->startsHumongous()) { |
|
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
|
4836 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
|
4837 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4838 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4839 _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
|
4840 "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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parents:
2369
diff
changeset
|
4841 // 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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parents:
2369
diff
changeset
|
4842 _hum_capacity_bytes = capacity_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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4843 _hum_used_bytes = used_bytes; |
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4844 _hum_prev_live_bytes = prev_live_bytes; |
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4845 _hum_next_live_bytes = next_live_bytes; |
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4846 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4847 &prev_live_bytes, &next_live_bytes); |
|
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4848 end = bottom + HeapRegion::GrainWords; |
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|
4849 } else if (r->continuesHumongous()) { |
|
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4850 type = "HUMC"; |
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4851 get_hum_bytes(&used_bytes, &capacity_bytes, |
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|
4852 &prev_live_bytes, &next_live_bytes); |
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4853 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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4854 } else { |
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4855 type = "OLD"; |
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|
4856 } |
|
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changeset
|
4857 |
|
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|
4858 _total_used_bytes += used_bytes; |
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|
4859 _total_capacity_bytes += capacity_bytes; |
|
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|
4860 _total_prev_live_bytes += prev_live_bytes; |
|
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|
4861 _total_next_live_bytes += next_live_bytes; |
|
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|
4862 |
|
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|
4863 // Print a line for this particular region. |
|
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|
4864 _out->print_cr(G1PPRL_LINE_PREFIX |
|
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|
4865 G1PPRL_TYPE_FORMAT |
|
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|
4866 G1PPRL_ADDR_BASE_FORMAT |
|
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|
4867 G1PPRL_BYTE_FORMAT |
|
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|
4868 G1PPRL_BYTE_FORMAT |
|
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|
4869 G1PPRL_BYTE_FORMAT |
|
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|
4870 G1PPRL_DOUBLE_FORMAT, |
|
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|
4871 type, bottom, end, |
|
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|
4872 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
|
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|
4873 |
|
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|
4874 return false; |
|
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diff
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|
4875 } |
|
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|
4876 |
|
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|
4877 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
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|
4878 // Print the footer of the output. |
|
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|
4879 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
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|
4880 _out->print_cr(G1PPRL_LINE_PREFIX |
|
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|
4881 " SUMMARY" |
|
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|
4882 G1PPRL_SUM_MB_FORMAT("capacity") |
|
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|
4883 G1PPRL_SUM_MB_PERC_FORMAT("used") |
|
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|
4884 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
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|
4885 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
|
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|
4886 bytes_to_mb(_total_capacity_bytes), |
|
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|
4887 bytes_to_mb(_total_used_bytes), |
|
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|
4888 perc(_total_used_bytes, _total_capacity_bytes), |
|
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|
4889 bytes_to_mb(_total_prev_live_bytes), |
|
371bbc844bf1
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diff
changeset
|
4890 perc(_total_prev_live_bytes, _total_capacity_bytes), |
|
371bbc844bf1
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diff
changeset
|
4891 bytes_to_mb(_total_next_live_bytes), |
|
371bbc844bf1
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changeset
|
4892 perc(_total_next_live_bytes, _total_capacity_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
|
4893 _out->cr(); |
|
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diff
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|
4894 } |