Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 6030:48fac5d60c3c
7163848: G1: Log GC Cause for a GC
Reviewed-by: johnc, jwilhelm, jmasa
| author | brutisso |
|---|---|
| date | Wed, 25 Apr 2012 12:36:37 +0200 |
| parents | 8a2e5a6a19a4 |
| children | d2a62e0f25eb 922993931b3d |
| 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" |
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32 #include "gc_implementation/g1/g1Log.hpp" |
| 3771 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 1972 | 34 #include "gc_implementation/g1/g1RemSet.hpp" |
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35 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 37 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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38 #include "gc_implementation/shared/vmGCOperations.hpp" |
| 1972 | 39 #include "memory/genOopClosures.inline.hpp" |
| 40 #include "memory/referencePolicy.hpp" | |
| 41 #include "memory/resourceArea.hpp" | |
| 42 #include "oops/oop.inline.hpp" | |
| 43 #include "runtime/handles.inline.hpp" | |
| 44 #include "runtime/java.hpp" | |
| 342 | 45 |
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46 // Concurrent marking bit map wrapper |
| 342 | 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 | |
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56 guarantee(brs.is_reserved(), "couldn't allocate concurrent marking bit map"); |
| 342 | 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()), | |
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60 "couldn't reseve backing store for concurrent marking bit map"); |
| 342 | 61 assert(_virtual_space.committed_size() == brs.size(), |
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62 "didn't reserve backing store for all of concurrent marking bit map?"); |
| 342 | 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 #ifndef PRODUCT | |
| 108 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
| 109 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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110 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
| 342 | 111 "size inconsistency"); |
| 112 return _bmStartWord == (HeapWord*)(rs.base()) && | |
| 113 _bmWordSize == rs.size()>>LogHeapWordSize; | |
| 114 } | |
| 115 #endif | |
| 116 | |
| 117 void CMBitMap::clearAll() { | |
| 118 _bm.clear(); | |
| 119 return; | |
| 120 } | |
| 121 | |
| 122 void CMBitMap::markRange(MemRegion mr) { | |
| 123 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 124 assert(!mr.is_empty(), "unexpected empty region"); | |
| 125 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 126 ((HeapWord *) mr.end())), | |
| 127 "markRange memory region end is not card aligned"); | |
| 128 // convert address range into offset range | |
| 129 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 130 heapWordToOffset(mr.end()), true); | |
| 131 } | |
| 132 | |
| 133 void CMBitMap::clearRange(MemRegion mr) { | |
| 134 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 135 assert(!mr.is_empty(), "unexpected empty region"); | |
| 136 // convert address range into offset range | |
| 137 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 138 heapWordToOffset(mr.end()), false); | |
| 139 } | |
| 140 | |
| 141 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 142 HeapWord* end_addr) { | |
| 143 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 144 start = MIN2(start, end_addr); | |
| 145 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 146 end = MIN2(end, end_addr); | |
| 147 assert(start <= end, "Consistency check"); | |
| 148 MemRegion mr(start, end); | |
| 149 if (!mr.is_empty()) { | |
| 150 clearRange(mr); | |
| 151 } | |
| 152 return mr; | |
| 153 } | |
| 154 | |
| 155 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 156 _base(NULL), _cm(cm) | |
| 157 #ifdef ASSERT | |
| 158 , _drain_in_progress(false) | |
| 159 , _drain_in_progress_yields(false) | |
| 160 #endif | |
| 161 {} | |
| 162 | |
| 163 void CMMarkStack::allocate(size_t size) { | |
| 164 _base = NEW_C_HEAP_ARRAY(oop, size); | |
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165 if (_base == NULL) { |
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166 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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167 } |
| 342 | 168 _index = 0; |
| 169 _capacity = (jint) size; | |
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170 _saved_index = -1; |
| 342 | 171 NOT_PRODUCT(_max_depth = 0); |
| 172 } | |
| 173 | |
| 174 CMMarkStack::~CMMarkStack() { | |
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175 if (_base != NULL) { |
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176 FREE_C_HEAP_ARRAY(oop, _base); |
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177 } |
| 342 | 178 } |
| 179 | |
| 180 void CMMarkStack::par_push(oop ptr) { | |
| 181 while (true) { | |
| 182 if (isFull()) { | |
| 183 _overflow = true; | |
| 184 return; | |
| 185 } | |
| 186 // Otherwise... | |
| 187 jint index = _index; | |
| 188 jint next_index = index+1; | |
| 189 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 190 if (res == index) { | |
| 191 _base[index] = ptr; | |
| 192 // Note that we don't maintain this atomically. We could, but it | |
| 193 // doesn't seem necessary. | |
| 194 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 195 return; | |
| 196 } | |
| 197 // Otherwise, we need to try again. | |
| 198 } | |
| 199 } | |
| 200 | |
| 201 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 202 while (true) { | |
| 203 if (isFull()) { | |
| 204 _overflow = true; | |
| 205 return; | |
| 206 } | |
| 207 // Otherwise... | |
| 208 jint index = _index; | |
| 209 jint next_index = index + n; | |
| 210 if (next_index > _capacity) { | |
| 211 _overflow = true; | |
| 212 return; | |
| 213 } | |
| 214 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 215 if (res == index) { | |
| 216 for (int i = 0; i < n; i++) { | |
| 217 int ind = index + i; | |
| 218 assert(ind < _capacity, "By overflow test above."); | |
| 219 _base[ind] = ptr_arr[i]; | |
| 220 } | |
| 221 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 222 return; | |
| 223 } | |
| 224 // Otherwise, we need to try again. | |
| 225 } | |
| 226 } | |
| 227 | |
| 228 | |
| 229 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 230 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 231 jint start = _index; | |
| 232 jint next_index = start + n; | |
| 233 if (next_index > _capacity) { | |
| 234 _overflow = true; | |
| 235 return; | |
| 236 } | |
| 237 // Otherwise. | |
| 238 _index = next_index; | |
| 239 for (int i = 0; i < n; i++) { | |
| 240 int ind = start + i; | |
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241 assert(ind < _capacity, "By overflow test above."); |
| 342 | 242 _base[ind] = ptr_arr[i]; |
| 243 } | |
| 244 } | |
| 245 | |
| 246 | |
| 247 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 248 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 249 jint index = _index; | |
| 250 if (index == 0) { | |
| 251 *n = 0; | |
| 252 return false; | |
| 253 } else { | |
| 254 int k = MIN2(max, index); | |
| 255 jint new_ind = index - k; | |
| 256 for (int j = 0; j < k; j++) { | |
| 257 ptr_arr[j] = _base[new_ind + j]; | |
| 258 } | |
| 259 _index = new_ind; | |
| 260 *n = k; | |
| 261 return true; | |
| 262 } | |
| 263 } | |
| 264 | |
| 265 template<class OopClosureClass> | |
| 266 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 267 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 268 || SafepointSynchronize::is_at_safepoint(), | |
| 269 "Drain recursion must be yield-safe."); | |
| 270 bool res = true; | |
| 271 debug_only(_drain_in_progress = true); | |
| 272 debug_only(_drain_in_progress_yields = yield_after); | |
| 273 while (!isEmpty()) { | |
| 274 oop newOop = pop(); | |
| 275 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 276 assert(newOop->is_oop(), "Expected an oop"); | |
| 277 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 278 "only grey objects on this stack"); | |
| 279 newOop->oop_iterate(cl); | |
| 280 if (yield_after && _cm->do_yield_check()) { | |
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281 res = false; |
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282 break; |
| 342 | 283 } |
| 284 } | |
| 285 debug_only(_drain_in_progress = false); | |
| 286 return res; | |
| 287 } | |
| 288 | |
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289 void CMMarkStack::note_start_of_gc() { |
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290 assert(_saved_index == -1, |
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291 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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292 _saved_index = _index; |
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293 } |
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294 |
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295 void CMMarkStack::note_end_of_gc() { |
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296 // This is intentionally a guarantee, instead of an assert. If we |
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297 // accidentally add something to the mark stack during GC, it |
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298 // will be a correctness issue so it's better if we crash. we'll |
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299 // only check this once per GC anyway, so it won't be a performance |
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300 // issue in any way. |
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301 guarantee(_saved_index == _index, |
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302 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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303 _saved_index = -1; |
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304 } |
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305 |
| 342 | 306 void CMMarkStack::oops_do(OopClosure* f) { |
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307 assert(_saved_index == _index, |
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308 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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309 for (int i = 0; i < _index; i += 1) { |
| 342 | 310 f->do_oop(&_base[i]); |
| 311 } | |
| 312 } | |
| 313 | |
| 314 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
| 315 return (_g1h->is_obj_ill(obj) | |
| 316 || (_g1h->is_in_permanent(obj) | |
| 317 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
| 318 } | |
| 319 | |
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320 CMRootRegions::CMRootRegions() : |
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321 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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322 _should_abort(false), _next_survivor(NULL) { } |
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323 |
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324 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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325 _young_list = g1h->young_list(); |
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326 _cm = cm; |
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327 } |
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328 |
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329 void CMRootRegions::prepare_for_scan() { |
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330 assert(!scan_in_progress(), "pre-condition"); |
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331 |
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332 // Currently, only survivors can be root regions. |
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333 assert(_next_survivor == NULL, "pre-condition"); |
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334 _next_survivor = _young_list->first_survivor_region(); |
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335 _scan_in_progress = (_next_survivor != NULL); |
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336 _should_abort = false; |
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337 } |
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338 |
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339 HeapRegion* CMRootRegions::claim_next() { |
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340 if (_should_abort) { |
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341 // If someone has set the should_abort flag, we return NULL to |
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342 // force the caller to bail out of their loop. |
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343 return NULL; |
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344 } |
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345 |
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346 // Currently, only survivors can be root regions. |
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347 HeapRegion* res = _next_survivor; |
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348 if (res != NULL) { |
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349 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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350 // Read it again in case it changed while we were waiting for the lock. |
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351 res = _next_survivor; |
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352 if (res != NULL) { |
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353 if (res == _young_list->last_survivor_region()) { |
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354 // We just claimed the last survivor so store NULL to indicate |
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355 // that we're done. |
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356 _next_survivor = NULL; |
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357 } else { |
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358 _next_survivor = res->get_next_young_region(); |
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359 } |
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360 } else { |
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361 // Someone else claimed the last survivor while we were trying |
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362 // to take the lock so nothing else to do. |
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363 } |
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364 } |
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365 assert(res == NULL || res->is_survivor(), "post-condition"); |
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366 |
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367 return res; |
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368 } |
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369 |
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370 void CMRootRegions::scan_finished() { |
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371 assert(scan_in_progress(), "pre-condition"); |
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372 |
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373 // Currently, only survivors can be root regions. |
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374 if (!_should_abort) { |
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375 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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376 } |
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377 _next_survivor = NULL; |
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378 |
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379 { |
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380 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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381 _scan_in_progress = false; |
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382 RootRegionScan_lock->notify_all(); |
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383 } |
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384 } |
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385 |
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386 bool CMRootRegions::wait_until_scan_finished() { |
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387 if (!scan_in_progress()) return false; |
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388 |
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389 { |
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390 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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391 while (scan_in_progress()) { |
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392 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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393 } |
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394 } |
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395 return true; |
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396 } |
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397 |
| 342 | 398 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 399 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 400 #endif // _MSC_VER | |
| 401 | |
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402 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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403 return MAX2((n_par_threads + 2) / 4, 1U); |
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404 } |
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405 |
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406 ConcurrentMark::ConcurrentMark(ReservedSpace rs, uint max_regions) : |
| 342 | 407 _markBitMap1(rs, MinObjAlignment - 1), |
| 408 _markBitMap2(rs, MinObjAlignment - 1), | |
| 409 | |
| 410 _parallel_marking_threads(0), | |
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411 _max_parallel_marking_threads(0), |
| 342 | 412 _sleep_factor(0.0), |
| 413 _marking_task_overhead(1.0), | |
| 414 _cleanup_sleep_factor(0.0), | |
| 415 _cleanup_task_overhead(1.0), | |
| 2152 | 416 _cleanup_list("Cleanup List"), |
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417 _region_bm((BitMap::idx_t) max_regions, false /* in_resource_area*/), |
| 342 | 418 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> |
| 419 CardTableModRefBS::card_shift, | |
| 420 false /* in_resource_area*/), | |
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421 |
| 342 | 422 _prevMarkBitMap(&_markBitMap1), |
| 423 _nextMarkBitMap(&_markBitMap2), | |
| 424 | |
| 425 _markStack(this), | |
| 426 // _finger set in set_non_marking_state | |
| 427 | |
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428 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 429 // _active_tasks set in set_non_marking_state |
| 430 // _tasks set inside the constructor | |
| 431 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
| 432 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
| 433 | |
| 434 _has_overflown(false), | |
| 435 _concurrent(false), | |
|
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436 _has_aborted(false), |
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437 _restart_for_overflow(false), |
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438 _concurrent_marking_in_progress(false), |
| 342 | 439 |
| 440 // _verbose_level set below | |
| 441 | |
| 442 _init_times(), | |
| 443 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 444 _cleanup_times(), | |
| 445 _total_counting_time(0.0), | |
| 446 _total_rs_scrub_time(0.0), | |
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447 |
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448 _parallel_workers(NULL), |
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449 |
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450 _count_card_bitmaps(NULL), |
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451 _count_marked_bytes(NULL) { |
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452 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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453 if (verbose_level < no_verbose) { |
| 342 | 454 verbose_level = no_verbose; |
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455 } |
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456 if (verbose_level > high_verbose) { |
| 342 | 457 verbose_level = high_verbose; |
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458 } |
| 342 | 459 _verbose_level = verbose_level; |
| 460 | |
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461 if (verbose_low()) { |
| 342 | 462 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
| 463 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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464 } |
| 342 | 465 |
| 1284 | 466 _markStack.allocate(MarkStackSize); |
| 342 | 467 |
| 468 // Create & start a ConcurrentMark thread. | |
|
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469 _cmThread = new ConcurrentMarkThread(this); |
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470 assert(cmThread() != NULL, "CM Thread should have been created"); |
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471 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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472 |
| 342 | 473 _g1h = G1CollectedHeap::heap(); |
| 474 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
| 475 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
| 476 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
| 477 | |
| 478 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 479 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 480 |
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481 _root_regions.init(_g1h, this); |
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482 |
| 342 | 483 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); |
| 484 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
| 485 | |
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486 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_task_num); |
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487 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_task_num); |
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488 |
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489 BitMap::idx_t card_bm_size = _card_bm.size(); |
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490 |
| 342 | 491 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
| 492 _active_tasks = _max_task_num; | |
| 493 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 494 CMTaskQueue* task_queue = new CMTaskQueue(); | |
| 495 task_queue->initialize(); | |
| 496 _task_queues->register_queue(i, task_queue); | |
| 497 | |
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498 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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499 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, (size_t) max_regions); |
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500 |
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501 _tasks[i] = new CMTask(i, this, |
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502 _count_marked_bytes[i], |
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503 &_count_card_bitmaps[i], |
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504 task_queue, _task_queues); |
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505 |
| 342 | 506 _accum_task_vtime[i] = 0.0; |
| 507 } | |
| 508 | |
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509 // Calculate the card number for the bottom of the heap. Used |
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510 // in biasing indexes into the accounting card bitmaps. |
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511 _heap_bottom_card_num = |
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512 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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513 CardTableModRefBS::card_shift); |
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514 |
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515 // Clear all the liveness counting data |
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516 clear_all_count_data(); |
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517 |
| 1284 | 518 if (ConcGCThreads > ParallelGCThreads) { |
| 519 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
| 342 | 520 "than ParallelGCThreads."); |
| 521 } | |
| 522 if (ParallelGCThreads == 0) { | |
| 523 // if we are not running with any parallel GC threads we will not | |
| 524 // spawn any marking threads either | |
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525 _parallel_marking_threads = 0; |
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526 _max_parallel_marking_threads = 0; |
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527 _sleep_factor = 0.0; |
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528 _marking_task_overhead = 1.0; |
| 342 | 529 } else { |
| 1284 | 530 if (ConcGCThreads > 0) { |
| 531 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
| 342 | 532 // if both are set |
| 533 | |
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534 _parallel_marking_threads = (uint) ConcGCThreads; |
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535 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 536 _sleep_factor = 0.0; |
| 537 _marking_task_overhead = 1.0; | |
| 751 | 538 } else if (G1MarkingOverheadPercent > 0) { |
| 342 | 539 // we will calculate the number of parallel marking threads |
| 540 // based on a target overhead with respect to the soft real-time | |
| 541 // goal | |
| 542 | |
| 751 | 543 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 544 double overall_cm_overhead = |
| 751 | 545 (double) MaxGCPauseMillis * marking_overhead / |
| 546 (double) GCPauseIntervalMillis; | |
| 342 | 547 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 548 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 549 double marking_task_overhead = | |
| 550 overall_cm_overhead / marking_thread_num * | |
| 551 (double) os::processor_count(); | |
| 552 double sleep_factor = | |
| 553 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 554 | |
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555 _parallel_marking_threads = (uint) marking_thread_num; |
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556 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 557 _sleep_factor = sleep_factor; |
| 558 _marking_task_overhead = marking_task_overhead; | |
| 559 } else { | |
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560 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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561 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 562 _sleep_factor = 0.0; |
| 563 _marking_task_overhead = 1.0; | |
| 564 } | |
| 565 | |
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566 if (parallel_marking_threads() > 1) { |
| 342 | 567 _cleanup_task_overhead = 1.0; |
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568 } else { |
| 342 | 569 _cleanup_task_overhead = marking_task_overhead(); |
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570 } |
| 342 | 571 _cleanup_sleep_factor = |
| 572 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 573 | |
| 574 #if 0 | |
| 575 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 576 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 577 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 578 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 579 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 580 #endif | |
| 581 | |
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582 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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583 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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584 _max_parallel_marking_threads, false, true); |
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585 if (_parallel_workers == NULL) { |
| 342 | 586 vm_exit_during_initialization("Failed necessary allocation."); |
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587 } else { |
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588 _parallel_workers->initialize_workers(); |
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589 } |
| 342 | 590 } |
| 591 | |
| 592 // so that the call below can read a sensible value | |
| 593 _heap_start = (HeapWord*) rs.base(); | |
| 594 set_non_marking_state(); | |
| 595 } | |
| 596 | |
| 597 void ConcurrentMark::update_g1_committed(bool force) { | |
| 598 // If concurrent marking is not in progress, then we do not need to | |
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599 // update _heap_end. |
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600 if (!concurrent_marking_in_progress() && !force) return; |
| 342 | 601 |
| 602 MemRegion committed = _g1h->g1_committed(); | |
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603 assert(committed.start() == _heap_start, "start shouldn't change"); |
| 342 | 604 HeapWord* new_end = committed.end(); |
| 605 if (new_end > _heap_end) { | |
| 606 // The heap has been expanded. | |
| 607 | |
| 608 _heap_end = new_end; | |
| 609 } | |
| 610 // Notice that the heap can also shrink. However, this only happens | |
| 611 // during a Full GC (at least currently) and the entire marking | |
| 612 // phase will bail out and the task will not be restarted. So, let's | |
| 613 // do nothing. | |
| 614 } | |
| 615 | |
| 616 void ConcurrentMark::reset() { | |
| 617 // Starting values for these two. This should be called in a STW | |
| 618 // phase. CM will be notified of any future g1_committed expansions | |
| 619 // will be at the end of evacuation pauses, when tasks are | |
| 620 // inactive. | |
| 621 MemRegion committed = _g1h->g1_committed(); | |
| 622 _heap_start = committed.start(); | |
| 623 _heap_end = committed.end(); | |
| 624 | |
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625 // Separated the asserts so that we know which one fires. |
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626 assert(_heap_start != NULL, "heap bounds should look ok"); |
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627 assert(_heap_end != NULL, "heap bounds should look ok"); |
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628 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 629 |
| 630 // reset all the marking data structures and any necessary flags | |
| 631 clear_marking_state(); | |
| 632 | |
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633 if (verbose_low()) { |
| 342 | 634 gclog_or_tty->print_cr("[global] resetting"); |
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635 } |
| 342 | 636 |
| 637 // We do reset all of them, since different phases will use | |
| 638 // different number of active threads. So, it's easiest to have all | |
| 639 // of them ready. | |
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640 for (int i = 0; i < (int) _max_task_num; ++i) { |
| 342 | 641 _tasks[i]->reset(_nextMarkBitMap); |
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642 } |
| 342 | 643 |
| 644 // we need this to make sure that the flag is on during the evac | |
| 645 // pause with initial mark piggy-backed | |
| 646 set_concurrent_marking_in_progress(); | |
| 647 } | |
| 648 | |
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649 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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650 assert(active_tasks <= _max_task_num, "we should not have more"); |
| 342 | 651 |
| 652 _active_tasks = active_tasks; | |
| 653 // Need to update the three data structures below according to the | |
| 654 // number of active threads for this phase. | |
| 655 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 656 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 657 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 658 | |
| 659 _concurrent = concurrent; | |
| 660 // We propagate this to all tasks, not just the active ones. | |
| 661 for (int i = 0; i < (int) _max_task_num; ++i) | |
| 662 _tasks[i]->set_concurrent(concurrent); | |
| 663 | |
| 664 if (concurrent) { | |
| 665 set_concurrent_marking_in_progress(); | |
| 666 } else { | |
| 667 // We currently assume that the concurrent flag has been set to | |
| 668 // false before we start remark. At this point we should also be | |
| 669 // in a STW phase. | |
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670 assert(!concurrent_marking_in_progress(), "invariant"); |
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671 assert(_finger == _heap_end, "only way to get here"); |
| 342 | 672 update_g1_committed(true); |
| 673 } | |
| 674 } | |
| 675 | |
| 676 void ConcurrentMark::set_non_marking_state() { | |
| 677 // We set the global marking state to some default values when we're | |
| 678 // not doing marking. | |
| 679 clear_marking_state(); | |
| 680 _active_tasks = 0; | |
| 681 clear_concurrent_marking_in_progress(); | |
| 682 } | |
| 683 | |
| 684 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 685 // The ConcurrentMark instance is never freed. |
| 686 ShouldNotReachHere(); | |
| 342 | 687 } |
| 688 | |
| 689 void ConcurrentMark::clearNextBitmap() { | |
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690 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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691 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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692 |
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693 // Make sure that the concurrent mark thread looks to still be in |
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694 // the current cycle. |
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695 guarantee(cmThread()->during_cycle(), "invariant"); |
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696 |
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697 // We are finishing up the current cycle by clearing the next |
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698 // marking bitmap and getting it ready for the next cycle. During |
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699 // this time no other cycle can start. So, let's make sure that this |
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700 // is the case. |
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701 guarantee(!g1h->mark_in_progress(), "invariant"); |
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702 |
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703 // clear the mark bitmap (no grey objects to start with). |
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704 // We need to do this in chunks and offer to yield in between |
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705 // each chunk. |
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706 HeapWord* start = _nextMarkBitMap->startWord(); |
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707 HeapWord* end = _nextMarkBitMap->endWord(); |
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708 HeapWord* cur = start; |
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709 size_t chunkSize = M; |
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710 while (cur < end) { |
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711 HeapWord* next = cur + chunkSize; |
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712 if (next > end) { |
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713 next = end; |
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714 } |
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715 MemRegion mr(cur,next); |
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716 _nextMarkBitMap->clearRange(mr); |
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717 cur = next; |
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718 do_yield_check(); |
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719 |
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720 // Repeat the asserts from above. We'll do them as asserts here to |
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721 // minimize their overhead on the product. However, we'll have |
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722 // them as guarantees at the beginning / end of the bitmap |
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723 // clearing to get some checking in the product. |
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724 assert(cmThread()->during_cycle(), "invariant"); |
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725 assert(!g1h->mark_in_progress(), "invariant"); |
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726 } |
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727 |
|
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728 // Clear the liveness counting data |
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729 clear_all_count_data(); |
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730 |
|
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731 // Repeat the asserts from above. |
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732 guarantee(cmThread()->during_cycle(), "invariant"); |
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733 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 734 } |
| 735 | |
| 736 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
| 737 public: | |
| 738 bool doHeapRegion(HeapRegion* r) { | |
| 739 if (!r->continuesHumongous()) { | |
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740 r->note_start_of_marking(); |
| 342 | 741 } |
| 742 return false; | |
| 743 } | |
| 744 }; | |
| 745 | |
| 746 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 747 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 748 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 749 | |
| 750 _has_aborted = false; | |
| 751 | |
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752 #ifndef PRODUCT |
| 1044 | 753 if (G1PrintReachableAtInitialMark) { |
| 1388 | 754 print_reachable("at-cycle-start", |
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755 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 756 } |
|
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757 #endif |
| 342 | 758 |
| 759 // Initialise marking structures. This has to be done in a STW phase. | |
| 760 reset(); | |
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761 |
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762 // For each region note start of marking. |
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763 NoteStartOfMarkHRClosure startcl; |
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764 g1h->heap_region_iterate(&startcl); |
| 342 | 765 } |
| 766 | |
| 767 | |
| 768 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 769 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 770 | |
|
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771 // If we force an overflow during remark, the remark operation will |
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772 // actually abort and we'll restart concurrent marking. If we always |
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773 // force an oveflow during remark we'll never actually complete the |
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774 // marking phase. So, we initilize this here, at the start of the |
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775 // cycle, so that at the remaining overflow number will decrease at |
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776 // every remark and we'll eventually not need to cause one. |
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777 force_overflow_stw()->init(); |
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778 |
|
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779 // Start Concurrent Marking weak-reference discovery. |
|
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780 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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781 // enable ("weak") refs discovery |
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782 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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783 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 784 |
| 785 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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786 // This is the start of the marking cycle, we're expected all |
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787 // threads to have SATB queues with active set to false. |
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788 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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789 false /* expected_active */); |
| 342 | 790 |
|
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791 _root_regions.prepare_for_scan(); |
|
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792 |
| 342 | 793 // update_g1_committed() will be called at the end of an evac pause |
| 794 // when marking is on. So, it's also called at the end of the | |
| 795 // initial-mark pause to update the heap end, if the heap expands | |
| 796 // during it. No need to call it here. | |
| 797 } | |
| 798 | |
| 799 /* | |
|
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800 * Notice that in the next two methods, we actually leave the STS |
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801 * during the barrier sync and join it immediately afterwards. If we |
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802 * do not do this, the following deadlock can occur: one thread could |
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803 * be in the barrier sync code, waiting for the other thread to also |
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804 * sync up, whereas another one could be trying to yield, while also |
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805 * waiting for the other threads to sync up too. |
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806 * |
|
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807 * Note, however, that this code is also used during remark and in |
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808 * this case we should not attempt to leave / enter the STS, otherwise |
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809 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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810 * (product). So we should only leave / enter the STS if we are |
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811 * operating concurrently. |
|
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812 * |
|
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813 * Because the thread that does the sync barrier has left the STS, it |
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814 * is possible to be suspended for a Full GC or an evacuation pause |
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815 * could occur. This is actually safe, since the entering the sync |
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816 * barrier is one of the last things do_marking_step() does, and it |
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817 * doesn't manipulate any data structures afterwards. |
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818 */ |
| 342 | 819 |
| 820 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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821 if (verbose_low()) { |
| 342 | 822 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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823 } |
| 342 | 824 |
|
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825 if (concurrent()) { |
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826 ConcurrentGCThread::stsLeave(); |
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827 } |
| 342 | 828 _first_overflow_barrier_sync.enter(); |
|
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829 if (concurrent()) { |
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830 ConcurrentGCThread::stsJoin(); |
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831 } |
| 342 | 832 // at this point everyone should have synced up and not be doing any |
| 833 // more work | |
| 834 | |
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835 if (verbose_low()) { |
| 342 | 836 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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837 } |
| 342 | 838 |
| 839 // let task 0 do this | |
| 840 if (task_num == 0) { | |
| 841 // task 0 is responsible for clearing the global data structures | |
|
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842 // We should be here because of an overflow. During STW we should |
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843 // not clear the overflow flag since we rely on it being true when |
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844 // we exit this method to abort the pause and restart concurent |
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845 // marking. |
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846 clear_marking_state(concurrent() /* clear_overflow */); |
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847 force_overflow()->update(); |
| 342 | 848 |
|
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849 if (G1Log::fine()) { |
| 342 | 850 gclog_or_tty->date_stamp(PrintGCDateStamps); |
| 851 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 852 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
| 853 } | |
| 854 } | |
| 855 | |
| 856 // after this, each task should reset its own data structures then | |
| 857 // then go into the second barrier | |
| 858 } | |
| 859 | |
| 860 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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861 if (verbose_low()) { |
| 342 | 862 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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863 } |
| 342 | 864 |
|
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865 if (concurrent()) { |
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866 ConcurrentGCThread::stsLeave(); |
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867 } |
| 342 | 868 _second_overflow_barrier_sync.enter(); |
|
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869 if (concurrent()) { |
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870 ConcurrentGCThread::stsJoin(); |
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871 } |
| 342 | 872 // at this point everything should be re-initialised and ready to go |
| 873 | |
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874 if (verbose_low()) { |
| 342 | 875 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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876 } |
| 342 | 877 } |
| 878 | |
|
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879 #ifndef PRODUCT |
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880 void ForceOverflowSettings::init() { |
|
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881 _num_remaining = G1ConcMarkForceOverflow; |
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882 _force = false; |
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883 update(); |
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884 } |
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885 |
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886 void ForceOverflowSettings::update() { |
|
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887 if (_num_remaining > 0) { |
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888 _num_remaining -= 1; |
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889 _force = true; |
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890 } else { |
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891 _force = false; |
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892 } |
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893 } |
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894 |
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895 bool ForceOverflowSettings::should_force() { |
|
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896 if (_force) { |
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897 _force = false; |
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898 return true; |
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899 } else { |
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900 return false; |
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901 } |
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902 } |
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903 #endif // !PRODUCT |
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904 |
| 342 | 905 class CMConcurrentMarkingTask: public AbstractGangTask { |
| 906 private: | |
| 907 ConcurrentMark* _cm; | |
| 908 ConcurrentMarkThread* _cmt; | |
| 909 | |
| 910 public: | |
|
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911 void work(uint worker_id) { |
|
1023
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912 assert(Thread::current()->is_ConcurrentGC_thread(), |
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913 "this should only be done by a conc GC thread"); |
|
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914 ResourceMark rm; |
| 342 | 915 |
| 916 double start_vtime = os::elapsedVTime(); | |
| 917 | |
| 918 ConcurrentGCThread::stsJoin(); | |
| 919 | |
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920 assert(worker_id < _cm->active_tasks(), "invariant"); |
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921 CMTask* the_task = _cm->task(worker_id); |
| 342 | 922 the_task->record_start_time(); |
| 923 if (!_cm->has_aborted()) { | |
| 924 do { | |
| 925 double start_vtime_sec = os::elapsedVTime(); | |
| 926 double start_time_sec = os::elapsedTime(); | |
|
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927 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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928 |
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929 the_task->do_marking_step(mark_step_duration_ms, |
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930 true /* do_stealing */, |
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931 true /* do_termination */); |
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932 |
| 342 | 933 double end_time_sec = os::elapsedTime(); |
| 934 double end_vtime_sec = os::elapsedVTime(); | |
| 935 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 936 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 937 _cm->clear_has_overflown(); | |
| 938 | |
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939 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 940 |
| 941 jlong sleep_time_ms; | |
| 942 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 943 sleep_time_ms = | |
| 944 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 945 ConcurrentGCThread::stsLeave(); | |
| 946 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 947 ConcurrentGCThread::stsJoin(); | |
| 948 } | |
| 949 double end_time2_sec = os::elapsedTime(); | |
| 950 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 951 | |
| 952 #if 0 | |
| 953 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 954 "overhead %1.4lf", | |
| 955 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 956 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 957 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 958 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 959 #endif | |
| 960 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 961 } | |
| 962 the_task->record_end_time(); | |
|
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963 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 964 |
| 965 ConcurrentGCThread::stsLeave(); | |
| 966 | |
| 967 double end_vtime = os::elapsedVTime(); | |
|
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968 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 969 } |
| 970 | |
| 971 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 972 ConcurrentMarkThread* cmt) : | |
| 973 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 974 | |
| 975 ~CMConcurrentMarkingTask() { } | |
| 976 }; | |
| 977 | |
|
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978 // Calculates the number of active workers for a concurrent |
|
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979 // phase. |
|
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980 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 981 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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982 uint n_conc_workers = 0; |
|
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983 if (!UseDynamicNumberOfGCThreads || |
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984 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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985 !ForceDynamicNumberOfGCThreads)) { |
|
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986 n_conc_workers = max_parallel_marking_threads(); |
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987 } else { |
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988 n_conc_workers = |
|
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989 AdaptiveSizePolicy::calc_default_active_workers( |
|
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990 max_parallel_marking_threads(), |
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991 1, /* Minimum workers */ |
|
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992 parallel_marking_threads(), |
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993 Threads::number_of_non_daemon_threads()); |
|
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994 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
|
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995 // that scaling has already gone into "_max_parallel_marking_threads". |
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996 } |
| 4711 | 997 assert(n_conc_workers > 0, "Always need at least 1"); |
| 998 return n_conc_workers; | |
|
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999 } |
| 4711 | 1000 // If we are not running with any parallel GC threads we will not |
| 1001 // have spawned any marking threads either. Hence the number of | |
| 1002 // concurrent workers should be 0. | |
| 1003 return 0; | |
|
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1004 } |
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1005 |
|
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1006 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
|
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1007 // Currently, only survivors can be root regions. |
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1008 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
|
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1009 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1010 |
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1011 const uintx interval = PrefetchScanIntervalInBytes; |
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1012 HeapWord* curr = hr->bottom(); |
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1013 const HeapWord* end = hr->top(); |
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1014 while (curr < end) { |
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1015 Prefetch::read(curr, interval); |
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1016 oop obj = oop(curr); |
|
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1017 int size = obj->oop_iterate(&cl); |
|
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1018 assert(size == obj->size(), "sanity"); |
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1019 curr += size; |
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1020 } |
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1021 } |
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1022 |
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1023 class CMRootRegionScanTask : public AbstractGangTask { |
|
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1024 private: |
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1025 ConcurrentMark* _cm; |
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1026 |
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1027 public: |
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1028 CMRootRegionScanTask(ConcurrentMark* cm) : |
|
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1029 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1030 |
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1031 void work(uint worker_id) { |
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1032 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1033 "this should only be done by a conc GC thread"); |
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1034 |
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1035 CMRootRegions* root_regions = _cm->root_regions(); |
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1036 HeapRegion* hr = root_regions->claim_next(); |
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1037 while (hr != NULL) { |
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1038 _cm->scanRootRegion(hr, worker_id); |
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1039 hr = root_regions->claim_next(); |
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1040 } |
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1041 } |
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1042 }; |
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1043 |
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1044 void ConcurrentMark::scanRootRegions() { |
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1045 // scan_in_progress() will have been set to true only if there was |
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1046 // at least one root region to scan. So, if it's false, we |
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1047 // should not attempt to do any further work. |
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1048 if (root_regions()->scan_in_progress()) { |
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1049 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1050 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1051 "Maximum number of marking threads exceeded"); |
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1052 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1053 |
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1054 CMRootRegionScanTask task(this); |
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1055 if (parallel_marking_threads() > 0) { |
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1056 _parallel_workers->set_active_workers((int) active_workers); |
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1057 _parallel_workers->run_task(&task); |
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1058 } else { |
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1059 task.work(0); |
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1060 } |
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1061 |
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1062 // It's possible that has_aborted() is true here without actually |
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1063 // aborting the survivor scan earlier. This is OK as it's |
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1064 // mainly used for sanity checking. |
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1065 root_regions()->scan_finished(); |
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1066 } |
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1067 } |
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1068 |
| 342 | 1069 void ConcurrentMark::markFromRoots() { |
| 1070 // we might be tempted to assert that: | |
| 1071 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1072 // "inconsistent argument?"); | |
| 1073 // However that wouldn't be right, because it's possible that | |
| 1074 // a safepoint is indeed in progress as a younger generation | |
| 1075 // stop-the-world GC happens even as we mark in this generation. | |
| 1076 | |
| 1077 _restart_for_overflow = false; | |
|
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1078 force_overflow_conc()->init(); |
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1079 |
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1080 // _g1h has _n_par_threads |
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1081 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1082 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1083 "Maximum number of marking threads exceeded"); |
| 4711 | 1084 |
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1085 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1086 |
| 1087 // Parallel task terminator is set in "set_phase()" | |
| 1088 set_phase(active_workers, true /* concurrent */); | |
| 342 | 1089 |
| 1090 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1091 if (parallel_marking_threads() > 0) { |
| 4711 | 1092 _parallel_workers->set_active_workers((int)active_workers); |
| 1093 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
| 1094 // and the decisions on that MT processing is made elsewhere. | |
| 1095 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1096 _parallel_workers->run_task(&markingTask); |
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1097 } else { |
| 342 | 1098 markingTask.work(0); |
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1099 } |
| 342 | 1100 print_stats(); |
| 1101 } | |
| 1102 | |
| 1103 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1104 // world is stopped at this checkpoint | |
| 1105 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1106 "world should be stopped"); | |
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1107 |
| 342 | 1108 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1109 | |
| 1110 // If a full collection has happened, we shouldn't do this. | |
| 1111 if (has_aborted()) { | |
| 1112 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1113 return; | |
| 1114 } | |
| 1115 | |
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1116 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1117 |
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1118 if (VerifyDuringGC) { |
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1119 HandleMark hm; // handle scope |
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1120 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1121 Universe::heap()->prepare_for_verify(); |
| 6008 | 1122 Universe::verify(/* silent */ false, |
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1123 /* option */ VerifyOption_G1UsePrevMarking); |
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1124 } |
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1125 |
| 342 | 1126 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1127 g1p->record_concurrent_mark_remark_start(); | |
| 1128 | |
| 1129 double start = os::elapsedTime(); | |
| 1130 | |
| 1131 checkpointRootsFinalWork(); | |
| 1132 | |
| 1133 double mark_work_end = os::elapsedTime(); | |
| 1134 | |
| 1135 weakRefsWork(clear_all_soft_refs); | |
| 1136 | |
| 1137 if (has_overflown()) { | |
| 1138 // Oops. We overflowed. Restart concurrent marking. | |
| 1139 _restart_for_overflow = true; | |
| 1140 // Clear the flag. We do not need it any more. | |
| 1141 clear_has_overflown(); | |
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1142 if (G1TraceMarkStackOverflow) { |
| 342 | 1143 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1144 } |
| 342 | 1145 } else { |
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1146 // Aggregate the per-task counting data that we have accumulated |
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1147 // while marking. |
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1148 aggregate_count_data(); |
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1149 |
| 2149 | 1150 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1151 // We're done with marking. |
|
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1152 // This is the end of the marking cycle, we're expected all |
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1153 // threads to have SATB queues with active set to true. |
| 2149 | 1154 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1155 true /* expected_active */); | |
| 811 | 1156 |
| 1157 if (VerifyDuringGC) { | |
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1158 HandleMark hm; // handle scope |
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1159 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1160 Universe::heap()->prepare_for_verify(); |
| 6008 | 1161 Universe::verify(/* silent */ false, |
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1162 /* option */ VerifyOption_G1UseNextMarking); |
| 811 | 1163 } |
|
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1164 assert(!restart_for_overflow(), "sanity"); |
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1165 } |
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1166 |
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1167 // Reset the marking state if marking completed |
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1168 if (!restart_for_overflow()) { |
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1169 set_non_marking_state(); |
| 342 | 1170 } |
| 1171 | |
| 1172 #if VERIFY_OBJS_PROCESSED | |
| 1173 _scan_obj_cl.objs_processed = 0; | |
| 1174 ThreadLocalObjQueue::objs_enqueued = 0; | |
| 1175 #endif | |
| 1176 | |
| 1177 // Statistics | |
| 1178 double now = os::elapsedTime(); | |
| 1179 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1180 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1181 _remark_times.add((now - start) * 1000.0); | |
| 1182 | |
| 1183 g1p->record_concurrent_mark_remark_end(); | |
| 1184 } | |
| 1185 | |
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1186 // Base class of the closures that finalize and verify the |
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1187 // liveness counting data. |
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1188 class CMCountDataClosureBase: public HeapRegionClosure { |
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1189 protected: |
| 342 | 1190 ConcurrentMark* _cm; |
| 1191 BitMap* _region_bm; | |
| 1192 BitMap* _card_bm; | |
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1193 |
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1194 void set_card_bitmap_range(BitMap::idx_t start_idx, BitMap::idx_t last_idx) { |
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1195 assert(start_idx <= last_idx, "sanity"); |
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1196 |
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1197 // Set the inclusive bit range [start_idx, last_idx]. |
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1198 // For small ranges (up to 8 cards) use a simple loop; otherwise |
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1199 // use par_at_put_range. |
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1200 if ((last_idx - start_idx) < 8) { |
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1201 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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1202 _card_bm->par_set_bit(i); |
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1203 } |
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1204 } else { |
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1205 assert(last_idx < _card_bm->size(), "sanity"); |
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1206 // Note BitMap::par_at_put_range() is exclusive. |
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1207 _card_bm->par_at_put_range(start_idx, last_idx+1, true); |
| 342 | 1208 } |
| 1209 } | |
| 1210 | |
| 829 | 1211 // It takes a region that's not empty (i.e., it has at least one |
| 1212 // live object in it and sets its corresponding bit on the region | |
| 1213 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1214 // to 1 the bits on the region bitmap that correspond to its | |
| 1215 // associated "continues humongous" regions. | |
| 1216 void set_bit_for_region(HeapRegion* hr) { | |
| 1217 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1218 | |
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1219 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
| 829 | 1220 if (!hr->startsHumongous()) { |
| 1221 // Normal (non-humongous) case: just set the bit. | |
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1222 _region_bm->par_at_put(index, true); |
| 829 | 1223 } else { |
| 1224 // Starts humongous case: calculate how many regions are part of | |
|
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1225 // this humongous region and then set the bit range. |
| 829 | 1226 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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1227 HeapRegion *last_hr = g1h->heap_region_containing_raw(hr->end() - 1); |
|
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1228 BitMap::idx_t end_index = (BitMap::idx_t) last_hr->hrs_index() + 1; |
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1229 _region_bm->par_at_put_range(index, end_index, true); |
| 829 | 1230 } |
| 1231 } | |
| 1232 | |
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1233 public: |
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1234 CMCountDataClosureBase(ConcurrentMark *cm, |
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1235 BitMap* region_bm, BitMap* card_bm): |
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1236 _cm(cm), _region_bm(region_bm), _card_bm(card_bm) { } |
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1237 }; |
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1238 |
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1239 // Closure that calculates the # live objects per region. Used |
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1240 // for verification purposes during the cleanup pause. |
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1241 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1242 CMBitMapRO* _bm; |
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1243 size_t _region_marked_bytes; |
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1244 |
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1245 public: |
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1246 CalcLiveObjectsClosure(CMBitMapRO *bm, ConcurrentMark *cm, |
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1247 BitMap* region_bm, BitMap* card_bm) : |
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1248 CMCountDataClosureBase(cm, region_bm, card_bm), |
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1249 _bm(bm), _region_marked_bytes(0) { } |
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1250 |
| 342 | 1251 bool doHeapRegion(HeapRegion* hr) { |
| 1252 | |
| 639 | 1253 if (hr->continuesHumongous()) { |
| 829 | 1254 // We will ignore these here and process them when their |
| 1255 // associated "starts humongous" region is processed (see | |
| 1256 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1257 // associated "starts humongous" region to have their bit set to | |
| 1258 // 1 since, due to the region chunking in the parallel region | |
| 1259 // iteration, a "continues humongous" region might be visited | |
| 1260 // before its associated "starts humongous". | |
| 639 | 1261 return false; |
| 1262 } | |
| 342 | 1263 |
| 1264 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
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1265 HeapWord* start = hr->bottom(); |
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1266 |
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1267 assert(start <= hr->end() && start <= nextTop && nextTop <= hr->end(), |
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1268 err_msg("Preconditions not met - " |
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1269 "start: "PTR_FORMAT", nextTop: "PTR_FORMAT", end: "PTR_FORMAT, |
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1270 start, nextTop, hr->end())); |
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1271 |
| 342 | 1272 // Find the first marked object at or after "start". |
| 1273 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
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1274 |
| 342 | 1275 size_t marked_bytes = 0; |
| 1276 | |
| 1277 while (start < nextTop) { | |
| 1278 oop obj = oop(start); | |
| 1279 int obj_sz = obj->size(); | |
| 1280 HeapWord* obj_last = start + obj_sz - 1; | |
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1281 |
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1282 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1283 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(obj_last); |
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1284 |
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1285 // Set the bits in the card BM for this object (inclusive). |
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1286 set_card_bitmap_range(start_idx, last_idx); |
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1287 |
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1288 // Add the size of this object to the number of marked bytes. |
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1289 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1290 |
| 342 | 1291 // Find the next marked object after this one. |
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1292 start = _bm->getNextMarkedWordAddress(obj_last + 1, nextTop); |
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1293 } |
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1294 |
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1295 // Mark the allocated-since-marking portion... |
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1296 HeapWord* top = hr->top(); |
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1297 if (nextTop < top) { |
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1298 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(nextTop); |
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1299 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top - 1); |
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1300 |
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1301 set_card_bitmap_range(start_idx, last_idx); |
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1302 |
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1303 // This definitely means the region has live objects. |
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1304 set_bit_for_region(hr); |
| 342 | 1305 } |
| 1306 | |
| 1307 // Update the live region bitmap. | |
| 1308 if (marked_bytes > 0) { | |
| 829 | 1309 set_bit_for_region(hr); |
| 342 | 1310 } |
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1311 |
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1312 // Set the marked bytes for the current region so that |
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1313 // it can be queried by a calling verificiation routine |
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1314 _region_marked_bytes = marked_bytes; |
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1315 |
| 342 | 1316 return false; |
| 1317 } | |
| 1318 | |
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1319 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1320 }; |
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1321 |
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1322 // Heap region closure used for verifying the counting data |
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1323 // that was accumulated concurrently and aggregated during |
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1324 // the remark pause. This closure is applied to the heap |
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1325 // regions during the STW cleanup pause. |
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1326 |
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1327 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1328 ConcurrentMark* _cm; |
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1329 CalcLiveObjectsClosure _calc_cl; |
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1330 BitMap* _region_bm; // Region BM to be verified |
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1331 BitMap* _card_bm; // Card BM to be verified |
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1332 bool _verbose; // verbose output? |
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1333 |
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1334 BitMap* _exp_region_bm; // Expected Region BM values |
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1335 BitMap* _exp_card_bm; // Expected card BM values |
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1336 |
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1337 int _failures; |
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1338 |
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1339 public: |
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1340 VerifyLiveObjectDataHRClosure(ConcurrentMark* cm, |
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1341 BitMap* region_bm, |
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1342 BitMap* card_bm, |
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1343 BitMap* exp_region_bm, |
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1344 BitMap* exp_card_bm, |
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1345 bool verbose) : |
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1346 _cm(cm), |
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1347 _calc_cl(_cm->nextMarkBitMap(), _cm, exp_region_bm, exp_card_bm), |
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1348 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1349 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1350 _failures(0) { } |
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1351 |
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1352 int failures() const { return _failures; } |
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1353 |
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1354 bool doHeapRegion(HeapRegion* hr) { |
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1355 if (hr->continuesHumongous()) { |
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1356 // We will ignore these here and process them when their |
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1357 // associated "starts humongous" region is processed (see |
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1358 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1359 // associated "starts humongous" region to have their bit set to |
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1360 // 1 since, due to the region chunking in the parallel region |
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1361 // iteration, a "continues humongous" region might be visited |
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1362 // before its associated "starts humongous". |
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1363 return false; |
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1364 } |
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1365 |
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1366 int failures = 0; |
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1367 |
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1368 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1369 // this region and set the corresponding bits in the expected region |
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1370 // and card bitmaps. |
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1371 bool res = _calc_cl.doHeapRegion(hr); |
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1372 assert(res == false, "should be continuing"); |
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1373 |
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1374 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1375 Mutex::_no_safepoint_check_flag); |
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|
1376 |
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1377 // Verify the marked bytes for this region. |
|
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1378 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
|
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1379 size_t act_marked_bytes = hr->next_marked_bytes(); |
|
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1380 |
|
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1381 // We're not OK if expected marked bytes > actual marked bytes. It means |
|
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1382 // we have missed accounting some objects during the actual marking. |
|
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1383 if (exp_marked_bytes > act_marked_bytes) { |
|
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1384 if (_verbose) { |
|
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1385 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
|
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1386 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
|
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1387 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
|
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1388 } |
|
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1389 failures += 1; |
|
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|
1390 } |
|
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|
1391 |
|
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1392 // Verify the bit, for this region, in the actual and expected |
|
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1393 // (which was just calculated) region bit maps. |
|
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1394 // We're not OK if the bit in the calculated expected region |
|
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1395 // bitmap is set and the bit in the actual region bitmap is not. |
|
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1396 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
|
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1397 |
|
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1398 bool expected = _exp_region_bm->at(index); |
|
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1399 bool actual = _region_bm->at(index); |
|
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1400 if (expected && !actual) { |
|
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1401 if (_verbose) { |
|
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1402 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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1403 "expected: %s, actual: %s", |
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1404 hr->hrs_index(), |
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1405 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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1406 } |
|
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1407 failures += 1; |
|
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|
1408 } |
|
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|
1409 |
|
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|
1410 // Verify that the card bit maps for the cards spanned by the current |
|
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1411 // region match. We have an error if we have a set bit in the expected |
|
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|
1412 // bit map and the corresponding bit in the actual bitmap is not set. |
|
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|
1413 |
|
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|
1414 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
|
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1415 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
|
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|
1416 |
|
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1417 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
|
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1418 expected = _exp_card_bm->at(i); |
|
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1419 actual = _card_bm->at(i); |
|
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|
1420 |
|
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|
1421 if (expected && !actual) { |
|
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|
1422 if (_verbose) { |
|
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|
1423 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
|
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|
1424 "expected: %s, actual: %s", |
|
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|
1425 hr->hrs_index(), i, |
|
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|
1426 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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|
1427 } |
|
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|
1428 failures += 1; |
|
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|
1429 } |
|
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|
1430 } |
|
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|
1431 |
|
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|
1432 if (failures > 0 && _verbose) { |
|
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|
1433 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
|
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|
1434 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
|
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|
1435 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
|
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|
1436 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
|
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|
1437 } |
|
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|
1438 |
|
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|
1439 _failures += failures; |
|
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changeset
|
1440 |
|
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|
1441 // We could stop iteration over the heap when we |
|
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1442 // find the first violating region by returning true. |
|
4836
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|
1443 return false; |
|
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|
1444 } |
| 342 | 1445 }; |
| 1446 | |
| 1447 | |
|
4836
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|
1448 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
|
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|
1449 protected: |
|
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|
1450 G1CollectedHeap* _g1h; |
|
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|
1451 ConcurrentMark* _cm; |
|
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|
1452 BitMap* _actual_region_bm; |
|
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|
1453 BitMap* _actual_card_bm; |
|
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|
1454 |
|
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|
1455 uint _n_workers; |
|
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|
1456 |
|
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|
1457 BitMap* _expected_region_bm; |
|
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|
1458 BitMap* _expected_card_bm; |
|
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|
1459 |
|
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|
1460 int _failures; |
|
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|
1461 bool _verbose; |
|
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|
1462 |
|
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|
1463 public: |
|
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|
1464 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
|
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|
1465 BitMap* region_bm, BitMap* card_bm, |
|
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|
1466 BitMap* expected_region_bm, BitMap* expected_card_bm) |
|
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|
1467 : AbstractGangTask("G1 verify final counting"), |
|
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|
1468 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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|
1469 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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changeset
|
1470 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
|
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|
1471 _failures(0), _verbose(false), |
|
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|
1472 _n_workers(0) { |
|
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|
1473 assert(VerifyDuringGC, "don't call this otherwise"); |
|
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|
1474 |
|
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changeset
|
1475 // Use the value already set as the number of active threads |
|
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|
1476 // in the call to run_task(). |
|
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|
1477 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1478 assert( _g1h->workers()->active_workers() > 0, |
|
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|
1479 "Should have been previously set"); |
|
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|
1480 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1481 } else { |
|
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|
1482 _n_workers = 1; |
|
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|
1483 } |
|
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changeset
|
1484 |
|
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changeset
|
1485 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
|
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changeset
|
1486 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
|
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|
1487 |
|
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changeset
|
1488 _verbose = _cm->verbose_medium(); |
|
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|
1489 } |
|
d30fa85f9994
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changeset
|
1490 |
|
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changeset
|
1491 void work(uint worker_id) { |
|
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changeset
|
1492 assert(worker_id < _n_workers, "invariant"); |
|
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|
1493 |
|
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changeset
|
1494 VerifyLiveObjectDataHRClosure verify_cl(_cm, |
|
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changeset
|
1495 _actual_region_bm, _actual_card_bm, |
|
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changeset
|
1496 _expected_region_bm, |
|
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changeset
|
1497 _expected_card_bm, |
|
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changeset
|
1498 _verbose); |
|
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1499 |
|
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1500 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1501 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
|
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1502 worker_id, |
|
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1503 _n_workers, |
|
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|
1504 HeapRegion::VerifyCountClaimValue); |
|
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1505 } else { |
|
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|
1506 _g1h->heap_region_iterate(&verify_cl); |
|
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|
1507 } |
|
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|
1508 |
|
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1509 Atomic::add(verify_cl.failures(), &_failures); |
|
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1510 } |
|
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|
1511 |
|
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|
1512 int failures() const { return _failures; } |
|
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1513 }; |
|
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1514 |
|
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1515 // Closure that finalizes the liveness counting data. |
|
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1516 // Used during the cleanup pause. |
|
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1517 // Sets the bits corresponding to the interval [NTAMS, top] |
|
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1518 // (which contains the implicitly live objects) in the |
|
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1519 // card liveness bitmap. Also sets the bit for each region, |
|
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1520 // containing live data, in the region liveness bitmap. |
|
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1521 |
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1522 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
|
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1523 public: |
|
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1524 FinalCountDataUpdateClosure(ConcurrentMark* cm, |
|
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1525 BitMap* region_bm, |
|
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1526 BitMap* card_bm) : |
|
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1527 CMCountDataClosureBase(cm, region_bm, card_bm) { } |
|
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1528 |
|
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|
1529 bool doHeapRegion(HeapRegion* hr) { |
|
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1530 |
|
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1531 if (hr->continuesHumongous()) { |
|
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1532 // We will ignore these here and process them when their |
|
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1533 // associated "starts humongous" region is processed (see |
|
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1534 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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1535 // associated "starts humongous" region to have their bit set to |
|
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1536 // 1 since, due to the region chunking in the parallel region |
|
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1537 // iteration, a "continues humongous" region might be visited |
|
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1538 // before its associated "starts humongous". |
|
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1539 return false; |
|
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|
1540 } |
|
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1541 |
|
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|
1542 HeapWord* ntams = hr->next_top_at_mark_start(); |
|
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1543 HeapWord* top = hr->top(); |
|
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1544 |
|
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1545 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
|
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1546 |
|
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1547 // Mark the allocated-since-marking portion... |
|
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1548 if (ntams < top) { |
|
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1549 // This definitely means the region has live objects. |
|
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1550 set_bit_for_region(hr); |
|
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|
1551 } |
|
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|
1552 |
|
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1553 // Now set the bits for [ntams, top] |
|
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1554 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
|
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|
1555 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top); |
|
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1556 set_card_bitmap_range(start_idx, last_idx); |
|
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|
1557 |
|
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|
1558 // Set the bit for the region if it contains live data |
|
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1559 if (hr->next_marked_bytes() > 0) { |
|
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|
1560 set_bit_for_region(hr); |
|
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|
1561 } |
|
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|
1562 |
|
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|
1563 return false; |
|
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|
1564 } |
|
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|
1565 }; |
| 342 | 1566 |
| 1567 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1568 protected: | |
| 1569 G1CollectedHeap* _g1h; | |
|
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1570 ConcurrentMark* _cm; |
|
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|
1571 BitMap* _actual_region_bm; |
|
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|
1572 BitMap* _actual_card_bm; |
|
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|
1573 |
|
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|
1574 uint _n_workers; |
|
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|
1575 |
| 342 | 1576 public: |
|
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|
1577 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
|
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|
1578 : AbstractGangTask("G1 final counting"), |
|
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|
1579 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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1580 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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|
1581 _n_workers(0) { |
|
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|
1582 // Use the value already set as the number of active threads |
| 6011 | 1583 // in the call to run_task(). |
|
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|
1584 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1585 assert( _g1h->workers()->active_workers() > 0, |
|
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|
1586 "Should have been previously set"); |
|
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|
1587 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1588 } else { |
| 342 | 1589 _n_workers = 1; |
|
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|
1590 } |
| 342 | 1591 } |
| 1592 | |
|
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|
1593 void work(uint worker_id) { |
|
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|
1594 assert(worker_id < _n_workers, "invariant"); |
|
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|
1595 |
|
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|
1596 FinalCountDataUpdateClosure final_update_cl(_cm, |
|
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|
1597 _actual_region_bm, |
|
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|
1598 _actual_card_bm); |
|
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|
1599 |
|
1833
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|
1600 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1601 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
|
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|
1602 worker_id, |
|
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|
1603 _n_workers, |
| 355 | 1604 HeapRegion::FinalCountClaimValue); |
| 342 | 1605 } else { |
|
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|
1606 _g1h->heap_region_iterate(&final_update_cl); |
| 342 | 1607 } |
| 1608 } | |
| 1609 }; | |
| 1610 | |
| 1611 class G1ParNoteEndTask; | |
| 1612 | |
| 1613 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1614 G1CollectedHeap* _g1; | |
| 1615 int _worker_num; | |
| 1616 size_t _max_live_bytes; | |
|
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|
1617 uint _regions_claimed; |
| 342 | 1618 size_t _freed_bytes; |
| 2173 | 1619 FreeRegionList* _local_cleanup_list; |
| 4072 | 1620 OldRegionSet* _old_proxy_set; |
| 2173 | 1621 HumongousRegionSet* _humongous_proxy_set; |
| 1622 HRRSCleanupTask* _hrrs_cleanup_task; | |
| 342 | 1623 double _claimed_region_time; |
| 1624 double _max_region_time; | |
| 1625 | |
| 1626 public: | |
| 1627 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1628 int worker_num, |
| 1629 FreeRegionList* local_cleanup_list, | |
| 4072 | 1630 OldRegionSet* old_proxy_set, |
| 2173 | 1631 HumongousRegionSet* humongous_proxy_set, |
|
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|
1632 HRRSCleanupTask* hrrs_cleanup_task) : |
|
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|
1633 _g1(g1), _worker_num(worker_num), |
|
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|
1634 _max_live_bytes(0), _regions_claimed(0), |
|
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|
1635 _freed_bytes(0), |
|
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|
1636 _claimed_region_time(0.0), _max_region_time(0.0), |
|
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|
1637 _local_cleanup_list(local_cleanup_list), |
|
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|
1638 _old_proxy_set(old_proxy_set), |
|
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|
1639 _humongous_proxy_set(humongous_proxy_set), |
|
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|
1640 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
|
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|
1641 |
| 342 | 1642 size_t freed_bytes() { return _freed_bytes; } |
| 1643 | |
|
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|
1644 bool doHeapRegion(HeapRegion *hr) { |
|
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1645 // We use a claim value of zero here because all regions |
|
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1646 // were claimed with value 1 in the FinalCount task. |
|
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1647 hr->reset_gc_time_stamp(); |
|
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1648 if (!hr->continuesHumongous()) { |
|
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1649 double start = os::elapsedTime(); |
|
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1650 _regions_claimed++; |
|
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1651 hr->note_end_of_marking(); |
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1652 _max_live_bytes += hr->max_live_bytes(); |
|
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1653 _g1->free_region_if_empty(hr, |
|
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1654 &_freed_bytes, |
|
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1655 _local_cleanup_list, |
|
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1656 _old_proxy_set, |
|
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1657 _humongous_proxy_set, |
|
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1658 _hrrs_cleanup_task, |
|
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1659 true /* par */); |
|
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1660 double region_time = (os::elapsedTime() - start); |
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1661 _claimed_region_time += region_time; |
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1662 if (region_time > _max_region_time) { |
|
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1663 _max_region_time = region_time; |
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1664 } |
|
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1665 } |
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1666 return false; |
|
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1667 } |
| 342 | 1668 |
| 1669 size_t max_live_bytes() { return _max_live_bytes; } | |
|
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1670 uint regions_claimed() { return _regions_claimed; } |
| 342 | 1671 double claimed_region_time_sec() { return _claimed_region_time; } |
| 1672 double max_region_time_sec() { return _max_region_time; } | |
| 1673 }; | |
| 1674 | |
| 1675 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1676 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1677 |
| 342 | 1678 protected: |
| 1679 G1CollectedHeap* _g1h; | |
| 1680 size_t _max_live_bytes; | |
| 1681 size_t _freed_bytes; | |
| 2152 | 1682 FreeRegionList* _cleanup_list; |
| 1683 | |
| 342 | 1684 public: |
| 1685 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1686 FreeRegionList* cleanup_list) : |
| 342 | 1687 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1688 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1689 |
|
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1690 void work(uint worker_id) { |
| 342 | 1691 double start = os::elapsedTime(); |
| 2173 | 1692 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 4072 | 1693 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
| 2173 | 1694 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
| 1695 HRRSCleanupTask hrrs_cleanup_task; | |
|
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1696 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
| 4072 | 1697 &old_proxy_set, |
| 2173 | 1698 &humongous_proxy_set, |
| 1699 &hrrs_cleanup_task); | |
|
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1700 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1701 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
|
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1702 _g1h->workers()->active_workers(), |
| 355 | 1703 HeapRegion::NoteEndClaimValue); |
| 342 | 1704 } else { |
| 1705 _g1h->heap_region_iterate(&g1_note_end); | |
| 1706 } | |
| 1707 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1708 | |
| 2152 | 1709 // Now update the lists |
| 1710 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
| 1711 NULL /* free_list */, | |
| 4072 | 1712 &old_proxy_set, |
| 2173 | 1713 &humongous_proxy_set, |
| 2152 | 1714 true /* par */); |
| 342 | 1715 { |
| 1716 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 1717 _max_live_bytes += g1_note_end.max_live_bytes(); | |
| 1718 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1719 |
|
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1720 // If we iterate over the global cleanup list at the end of |
|
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1721 // cleanup to do this printing we will not guarantee to only |
|
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1722 // generate output for the newly-reclaimed regions (the list |
|
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1723 // might not be empty at the beginning of cleanup; we might |
|
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1724 // still be working on its previous contents). So we do the |
|
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1725 // printing here, before we append the new regions to the global |
|
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1726 // cleanup list. |
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1727 |
|
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1728 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
|
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1729 if (hr_printer->is_active()) { |
|
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1730 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1731 while (iter.more_available()) { |
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1732 HeapRegion* hr = iter.get_next(); |
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1733 hr_printer->cleanup(hr); |
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1734 } |
|
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1735 } |
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1736 |
| 2173 | 1737 _cleanup_list->add_as_tail(&local_cleanup_list); |
| 1738 assert(local_cleanup_list.is_empty(), "post-condition"); | |
| 1739 | |
| 1740 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1741 } |
| 1742 } | |
| 1743 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1744 size_t freed_bytes() { return _freed_bytes; } | |
| 1745 }; | |
| 1746 | |
| 1747 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 1748 protected: | |
| 1749 G1RemSet* _g1rs; | |
| 1750 BitMap* _region_bm; | |
| 1751 BitMap* _card_bm; | |
| 1752 public: | |
| 1753 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 1754 BitMap* region_bm, BitMap* card_bm) : | |
| 1755 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
|
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1756 _region_bm(region_bm), _card_bm(card_bm) { } |
| 342 | 1757 |
|
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1758 void work(uint worker_id) { |
|
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1759 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1760 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 1761 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 1762 } else { |
| 1763 _g1rs->scrub(_region_bm, _card_bm); | |
| 1764 } | |
| 1765 } | |
| 1766 | |
| 1767 }; | |
| 1768 | |
| 1769 void ConcurrentMark::cleanup() { | |
| 1770 // world is stopped at this checkpoint | |
| 1771 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1772 "world should be stopped"); | |
| 1773 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1774 | |
| 1775 // If a full collection has happened, we shouldn't do this. | |
| 1776 if (has_aborted()) { | |
| 1777 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1778 return; | |
| 1779 } | |
| 1780 | |
| 4072 | 1781 HRSPhaseSetter x(HRSPhaseCleanup); |
| 2152 | 1782 g1h->verify_region_sets_optional(); |
| 1783 | |
|
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1784 if (VerifyDuringGC) { |
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1785 HandleMark hm; // handle scope |
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1786 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1787 Universe::heap()->prepare_for_verify(); |
| 6008 | 1788 Universe::verify(/* silent */ false, |
|
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1789 /* option */ VerifyOption_G1UsePrevMarking); |
|
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1790 } |
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1791 |
| 342 | 1792 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 1793 g1p->record_concurrent_mark_cleanup_start(); | |
| 1794 | |
| 1795 double start = os::elapsedTime(); | |
| 1796 | |
| 2173 | 1797 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 1798 | |
|
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1799 uint n_workers; |
|
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1800 |
| 342 | 1801 // Do counting once more with the world stopped for good measure. |
|
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1802 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1803 |
|
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1804 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1805 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
| 355 | 1806 "sanity check"); |
| 1807 | |
| 4711 | 1808 g1h->set_par_threads(); |
| 1809 n_workers = g1h->n_par_threads(); | |
|
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1810 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 1811 "Should not have been reset"); |
| 342 | 1812 g1h->workers()->run_task(&g1_par_count_task); |
|
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1813 // Done with the parallel phase so reset to 0. |
| 342 | 1814 g1h->set_par_threads(0); |
| 355 | 1815 |
|
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1816 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
| 355 | 1817 "sanity check"); |
| 342 | 1818 } else { |
| 4711 | 1819 n_workers = 1; |
| 342 | 1820 g1_par_count_task.work(0); |
| 1821 } | |
| 1822 | |
|
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1823 if (VerifyDuringGC) { |
|
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1824 // Verify that the counting data accumulated during marking matches |
|
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1825 // that calculated by walking the marking bitmap. |
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1826 |
|
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1827 // Bitmaps to hold expected values |
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1828 BitMap expected_region_bm(_region_bm.size(), false); |
|
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1829 BitMap expected_card_bm(_card_bm.size(), false); |
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1830 |
|
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1831 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
|
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1832 &_region_bm, |
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1833 &_card_bm, |
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1834 &expected_region_bm, |
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|
1835 &expected_card_bm); |
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1836 |
|
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1837 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1838 g1h->set_par_threads((int)n_workers); |
|
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1839 g1h->workers()->run_task(&g1_par_verify_task); |
|
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1840 // Done with the parallel phase so reset to 0. |
|
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1841 g1h->set_par_threads(0); |
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1842 |
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1843 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
|
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1844 "sanity check"); |
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1845 } else { |
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1846 g1_par_verify_task.work(0); |
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1847 } |
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1848 |
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1849 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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1850 } |
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1851 |
| 342 | 1852 size_t start_used_bytes = g1h->used(); |
| 1853 g1h->set_marking_complete(); | |
| 1854 | |
| 1855 double count_end = os::elapsedTime(); | |
| 1856 double this_final_counting_time = (count_end - start); | |
| 1857 _total_counting_time += this_final_counting_time; | |
| 1858 | |
|
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1859 if (G1PrintRegionLivenessInfo) { |
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1860 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1861 _g1h->heap_region_iterate(&cl); |
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1862 } |
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1863 |
| 342 | 1864 // Install newly created mark bitMap as "prev". |
| 1865 swapMarkBitMaps(); | |
| 1866 | |
| 1867 g1h->reset_gc_time_stamp(); | |
| 1868 | |
| 1869 // Note end of marking in all heap regions. | |
| 2152 | 1870 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
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1871 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1872 g1h->set_par_threads((int)n_workers); |
| 342 | 1873 g1h->workers()->run_task(&g1_par_note_end_task); |
| 1874 g1h->set_par_threads(0); | |
| 355 | 1875 |
| 1876 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 1877 "sanity check"); | |
| 342 | 1878 } else { |
| 1879 g1_par_note_end_task.work(0); | |
| 1880 } | |
| 2152 | 1881 |
| 1882 if (!cleanup_list_is_empty()) { | |
| 1883 // The cleanup list is not empty, so we'll have to process it | |
| 1884 // concurrently. Notify anyone else that might be wanting free | |
| 1885 // regions that there will be more free regions coming soon. | |
| 1886 g1h->set_free_regions_coming(); | |
| 1887 } | |
| 342 | 1888 |
| 1889 // call below, since it affects the metric by which we sort the heap | |
| 1890 // regions. | |
| 1891 if (G1ScrubRemSets) { | |
| 1892 double rs_scrub_start = os::elapsedTime(); | |
| 1893 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
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1894 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1895 g1h->set_par_threads((int)n_workers); |
| 342 | 1896 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 1897 g1h->set_par_threads(0); | |
| 355 | 1898 |
| 1899 assert(g1h->check_heap_region_claim_values( | |
| 1900 HeapRegion::ScrubRemSetClaimValue), | |
| 1901 "sanity check"); | |
| 342 | 1902 } else { |
| 1903 g1_par_scrub_rs_task.work(0); | |
| 1904 } | |
| 1905 | |
| 1906 double rs_scrub_end = os::elapsedTime(); | |
| 1907 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 1908 _total_rs_scrub_time += this_rs_scrub_time; | |
| 1909 } | |
| 1910 | |
| 1911 // this will also free any regions totally full of garbage objects, | |
| 1912 // and sort the regions. | |
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1913 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 1914 |
| 1915 // Statistics. | |
| 1916 double end = os::elapsedTime(); | |
| 1917 _cleanup_times.add((end - start) * 1000.0); | |
| 1918 | |
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1919 if (G1Log::fine()) { |
| 342 | 1920 g1h->print_size_transition(gclog_or_tty, |
| 1921 start_used_bytes, | |
| 1922 g1h->used(), | |
| 1923 g1h->capacity()); | |
| 1924 } | |
| 1925 | |
|
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1926 // Clean up will have freed any regions completely full of garbage. |
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1927 // Update the soft reference policy with the new heap occupancy. |
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1928 Universe::update_heap_info_at_gc(); |
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1929 |
| 342 | 1930 // We need to make this be a "collection" so any collection pause that |
| 1931 // races with it goes around and waits for completeCleanup to finish. | |
| 1932 g1h->increment_total_collections(); | |
| 1933 | |
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1934 // We reclaimed old regions so we should calculate the sizes to make |
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1935 // sure we update the old gen/space data. |
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1936 g1h->g1mm()->update_sizes(); |
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1937 |
| 751 | 1938 if (VerifyDuringGC) { |
|
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1939 HandleMark hm; // handle scope |
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1940 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1941 Universe::heap()->prepare_for_verify(); |
| 6008 | 1942 Universe::verify(/* silent */ false, |
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1943 /* option */ VerifyOption_G1UsePrevMarking); |
| 342 | 1944 } |
| 2152 | 1945 |
| 1946 g1h->verify_region_sets_optional(); | |
| 342 | 1947 } |
| 1948 | |
| 1949 void ConcurrentMark::completeCleanup() { | |
| 1950 if (has_aborted()) return; | |
| 1951 | |
| 2152 | 1952 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1953 | |
| 1954 _cleanup_list.verify_optional(); | |
| 2361 | 1955 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 1956 |
| 1957 if (G1ConcRegionFreeingVerbose) { | |
| 1958 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
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1959 "cleanup list has %u entries", |
| 2152 | 1960 _cleanup_list.length()); |
| 1961 } | |
| 1962 | |
| 1963 // Noone else should be accessing the _cleanup_list at this point, | |
| 1964 // so it's not necessary to take any locks | |
| 1965 while (!_cleanup_list.is_empty()) { | |
| 1966 HeapRegion* hr = _cleanup_list.remove_head(); | |
| 1967 assert(hr != NULL, "the list was not empty"); | |
|
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1968 hr->par_clear(); |
| 2361 | 1969 tmp_free_list.add_as_tail(hr); |
| 2152 | 1970 |
| 1971 // Instead of adding one region at a time to the secondary_free_list, | |
| 1972 // we accumulate them in the local list and move them a few at a | |
| 1973 // time. This also cuts down on the number of notify_all() calls | |
| 1974 // we do during this process. We'll also append the local list when | |
| 1975 // _cleanup_list is empty (which means we just removed the last | |
| 1976 // region from the _cleanup_list). | |
| 2361 | 1977 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 1978 _cleanup_list.is_empty()) { |
| 1979 if (G1ConcRegionFreeingVerbose) { | |
| 1980 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
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1981 "appending %u entries to the secondary_free_list, " |
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1982 "cleanup list still has %u entries", |
| 2361 | 1983 tmp_free_list.length(), |
| 2152 | 1984 _cleanup_list.length()); |
| 342 | 1985 } |
| 2152 | 1986 |
| 1987 { | |
| 1988 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 2361 | 1989 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
| 2152 | 1990 SecondaryFreeList_lock->notify_all(); |
| 1991 } | |
| 1992 | |
| 1993 if (G1StressConcRegionFreeing) { | |
| 1994 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 1995 os::sleep(Thread::current(), (jlong) 1, false); | |
| 1996 } | |
| 1997 } | |
| 342 | 1998 } |
| 1999 } | |
| 2361 | 2000 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 2001 } |
| 2002 | |
|
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2003 // Support closures for reference procssing in G1 |
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2004 |
|
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2005 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
|
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2006 HeapWord* addr = (HeapWord*)obj; |
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2007 return addr != NULL && |
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2008 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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2009 } |
| 342 | 2010 |
| 2011 class G1CMKeepAliveClosure: public OopClosure { | |
| 2012 G1CollectedHeap* _g1; | |
| 2013 ConcurrentMark* _cm; | |
| 2014 public: | |
|
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2015 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
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2016 _g1(g1), _cm(cm) { |
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2017 assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
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2018 } |
| 342 | 2019 |
|
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2020 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2021 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2022 |
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2023 template <class T> void do_oop_work(T* p) { |
|
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2024 oop obj = oopDesc::load_decode_heap_oop(p); |
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2025 HeapWord* addr = (HeapWord*)obj; |
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2026 |
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2027 if (_cm->verbose_high()) { |
|
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2028 gclog_or_tty->print_cr("\t[0] we're looking at location " |
|
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2029 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2030 p, (void*) obj); |
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2031 } |
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2032 |
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2033 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
|
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2034 _cm->mark_and_count(obj); |
|
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2035 _cm->mark_stack_push(obj); |
| 342 | 2036 } |
| 2037 } | |
| 2038 }; | |
| 2039 | |
| 2040 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
|
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2041 ConcurrentMark* _cm; |
| 342 | 2042 CMMarkStack* _markStack; |
| 2043 G1CMKeepAliveClosure* _oopClosure; | |
| 2044 public: | |
|
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2045 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
| 342 | 2046 G1CMKeepAliveClosure* oopClosure) : |
|
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2047 _cm(cm), |
| 342 | 2048 _markStack(markStack), |
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2049 _oopClosure(oopClosure) { } |
| 342 | 2050 |
| 2051 void do_void() { | |
|
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2052 _markStack->drain((OopClosure*)_oopClosure, _cm->nextMarkBitMap(), false); |
| 342 | 2053 } |
| 2054 }; | |
| 2055 | |
|
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2056 // 'Keep Alive' closure used by parallel reference processing. |
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2057 // An instance of this closure is used in the parallel reference processing |
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2058 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2059 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2060 // placed on to discovered ref lists once so we can mark and push with no |
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2061 // need to check whether the object has already been marked. Using the |
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2062 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2063 // operating on the global mark stack. This means that an individual |
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2064 // worker would be doing lock-free pushes while it processes its own |
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2065 // discovered ref list followed by drain call. If the discovered ref lists |
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2066 // are unbalanced then this could cause interference with the other |
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2067 // workers. Using a CMTask (and its embedded local data structures) |
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2068 // avoids that potential interference. |
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2069 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2070 ConcurrentMark* _cm; |
|
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2071 CMTask* _task; |
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2072 int _ref_counter_limit; |
|
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2073 int _ref_counter; |
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2074 public: |
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2075 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2076 _cm(cm), _task(task), |
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2077 _ref_counter_limit(G1RefProcDrainInterval) { |
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2078 assert(_ref_counter_limit > 0, "sanity"); |
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2079 _ref_counter = _ref_counter_limit; |
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2080 } |
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2081 |
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2082 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2083 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2084 |
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2085 template <class T> void do_oop_work(T* p) { |
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2086 if (!_cm->has_overflown()) { |
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2087 oop obj = oopDesc::load_decode_heap_oop(p); |
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2088 if (_cm->verbose_high()) { |
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2089 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2090 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2091 _task->task_id(), p, (void*) obj); |
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2092 } |
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2093 |
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2094 _task->deal_with_reference(obj); |
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2095 _ref_counter--; |
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2096 |
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2097 if (_ref_counter == 0) { |
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2098 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2099 // reachable from them on to the local stack (and possibly the global stack). |
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2100 // Call do_marking_step() to process these entries. We call the routine in a |
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2101 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2102 // with the entries that we've pushed as a result of the deal_with_reference |
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2103 // calls above) or we overflow. |
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2104 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2105 // while there may still be some work to do. (See the comment at the |
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2106 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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|
2107 // is reaching the specified time target.) It is only when |
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2108 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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|
2109 // that the marking has completed. |
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2110 do { |
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|
2111 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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|
2112 _task->do_marking_step(mark_step_duration_ms, |
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|
2113 false /* do_stealing */, |
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|
2114 false /* do_termination */); |
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|
2115 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2116 _ref_counter = _ref_counter_limit; |
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|
2117 } |
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|
2118 } else { |
|
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2119 if (_cm->verbose_high()) { |
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2120 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
|
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2121 } |
|
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2122 } |
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|
2123 } |
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|
2124 }; |
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2125 |
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2126 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
|
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|
2127 ConcurrentMark* _cm; |
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|
2128 CMTask* _task; |
|
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|
2129 public: |
|
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|
2130 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
|
4836
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|
2131 _cm(cm), _task(task) { } |
|
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2132 |
|
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|
2133 void do_void() { |
|
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|
2134 do { |
|
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|
2135 if (_cm->verbose_high()) { |
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|
2136 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
|
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|
2137 _task->task_id()); |
|
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|
2138 } |
|
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|
2139 |
|
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|
2140 // We call CMTask::do_marking_step() to completely drain the local and |
|
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|
2141 // global marking stacks. The routine is called in a loop, which we'll |
|
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|
2142 // exit if there's nothing more to do (i.e. we'completely drained the |
|
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|
2143 // entries that were pushed as a result of applying the |
|
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|
2144 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
|
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|
2145 // lists above) or we overflow the global marking stack. |
|
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|
2146 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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|
2147 // while there may still be some work to do. (See the comment at the |
|
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|
2148 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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|
2149 // is reaching the specified time target.) It is only when |
|
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|
2150 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2151 // that the marking has completed. |
|
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|
2152 |
|
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|
2153 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2154 true /* do_stealing */, |
|
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|
2155 true /* do_termination */); |
|
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|
2156 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2157 } |
|
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|
2158 }; |
|
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|
2159 |
|
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|
2160 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
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|
2161 // reference processing at the end of G1 concurrent marking |
|
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|
2162 |
|
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|
2163 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
2174
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|
2164 private: |
|
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|
2165 G1CollectedHeap* _g1h; |
|
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|
2166 ConcurrentMark* _cm; |
|
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|
2167 WorkGang* _workers; |
|
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|
2168 int _active_workers; |
|
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|
2169 |
|
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|
2170 public: |
|
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|
2171 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
2174
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|
2172 ConcurrentMark* cm, |
|
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|
2173 WorkGang* workers, |
|
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|
2174 int n_workers) : |
|
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|
2175 _g1h(g1h), _cm(cm), |
|
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|
2176 _workers(workers), _active_workers(n_workers) { } |
|
2174
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|
2177 |
|
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|
2178 // Executes the given task using concurrent marking worker threads. |
|
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|
2179 virtual void execute(ProcessTask& task); |
|
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|
2180 virtual void execute(EnqueueTask& task); |
|
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|
2181 }; |
|
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|
2182 |
|
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|
2183 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
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|
2184 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
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|
2185 ProcessTask& _proc_task; |
|
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|
2186 G1CollectedHeap* _g1h; |
|
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|
2187 ConcurrentMark* _cm; |
|
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|
2188 |
|
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|
2189 public: |
|
3979
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|
2190 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
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|
2191 G1CollectedHeap* g1h, |
|
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|
2192 ConcurrentMark* cm) : |
|
2174
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|
2193 AbstractGangTask("Process reference objects in parallel"), |
|
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|
2194 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
|
2174
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|
2195 |
|
4728
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4711
diff
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|
2196 virtual void work(uint worker_id) { |
|
441e946dc1af
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|
2197 CMTask* marking_task = _cm->task(worker_id); |
|
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|
2198 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
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2199 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
|
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2200 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
|
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2201 |
|
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|
2202 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
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|
2203 } |
|
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|
2204 }; |
|
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2205 |
|
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2206 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
2174
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2207 assert(_workers != NULL, "Need parallel worker threads."); |
|
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2208 |
|
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2209 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
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2210 |
|
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2211 // We need to reset the phase for each task execution so that |
|
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2212 // the termination protocol of CMTask::do_marking_step works. |
|
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2213 _cm->set_phase(_active_workers, false /* concurrent */); |
|
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2214 _g1h->set_par_threads(_active_workers); |
|
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2215 _workers->run_task(&proc_task_proxy); |
|
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2216 _g1h->set_par_threads(0); |
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|
2217 } |
|
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2218 |
|
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2219 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
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2220 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
2221 EnqueueTask& _enq_task; |
|
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|
2222 |
|
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2223 public: |
|
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|
2224 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
2174
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|
2225 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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2226 _enq_task(enq_task) { } |
|
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2227 |
|
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|
2228 virtual void work(uint worker_id) { |
|
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|
2229 _enq_task.work(worker_id); |
|
2174
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|
2230 } |
|
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|
2231 }; |
|
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|
2232 |
|
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|
2233 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
2234 assert(_workers != NULL, "Need parallel worker threads."); |
|
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2235 |
|
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|
2236 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
2237 |
|
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|
2238 _g1h->set_par_threads(_active_workers); |
|
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|
2239 _workers->run_task(&enq_task_proxy); |
|
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|
2240 _g1h->set_par_threads(0); |
|
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|
2241 } |
|
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|
2242 |
| 342 | 2243 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
| 2244 ResourceMark rm; | |
| 2245 HandleMark hm; | |
|
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2246 |
|
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2247 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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2248 |
|
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|
2249 // Is alive closure. |
|
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|
2250 G1CMIsAliveClosure g1_is_alive(g1h); |
|
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|
2251 |
|
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|
2252 // Inner scope to exclude the cleaning of the string and symbol |
|
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|
2253 // tables from the displayed time. |
|
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|
2254 { |
|
6007
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|
2255 if (G1Log::finer()) { |
|
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|
2256 gclog_or_tty->put(' '); |
|
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|
2257 } |
|
6007
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2258 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
|
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2259 |
|
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|
2260 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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2261 |
|
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|
2262 // See the comment in G1CollectedHeap::ref_processing_init() |
|
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|
2263 // about how reference processing currently works in G1. |
|
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|
2264 |
|
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|
2265 // Process weak references. |
|
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|
2266 rp->setup_policy(clear_all_soft_refs); |
|
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|
2267 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
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|
2268 |
|
4836
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|
2269 G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
|
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|
2270 G1CMDrainMarkingStackClosure |
|
4836
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|
2271 g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
|
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|
2272 |
|
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|
2273 // We use the work gang from the G1CollectedHeap and we utilize all |
|
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|
2274 // the worker threads. |
|
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|
2275 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
|
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|
2276 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
|
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|
2277 |
|
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|
2278 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
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|
2279 g1h->workers(), active_workers); |
|
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|
2280 |
|
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|
2281 if (rp->processing_is_mt()) { |
|
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|
2282 // Set the degree of MT here. If the discovery is done MT, there |
|
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|
2283 // may have been a different number of threads doing the discovery |
|
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|
2284 // and a different number of discovered lists may have Ref objects. |
|
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|
2285 // That is OK as long as the Reference lists are balanced (see |
|
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|
2286 // balance_all_queues() and balance_queues()). |
|
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|
2287 rp->set_active_mt_degree(active_workers); |
|
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|
2288 |
|
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|
2289 rp->process_discovered_references(&g1_is_alive, |
|
2174
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|
2290 &g1_keep_alive, |
|
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|
2291 &g1_drain_mark_stack, |
|
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|
2292 &par_task_executor); |
|
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|
2293 |
|
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|
2294 // The work routines of the parallel keep_alive and drain_marking_stack |
|
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|
2295 // will set the has_overflown flag if we overflow the global marking |
|
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|
2296 // stack. |
|
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|
2297 } else { |
|
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|
2298 rp->process_discovered_references(&g1_is_alive, |
|
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|
2299 &g1_keep_alive, |
|
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|
2300 &g1_drain_mark_stack, |
|
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|
2301 NULL); |
|
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|
2302 } |
|
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|
2303 |
|
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|
2304 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
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|
2305 "mark stack should be empty (unless it overflowed)"); |
|
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|
2306 if (_markStack.overflow()) { |
|
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|
2307 // Should have been done already when we tried to push an |
|
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|
2308 // entry on to the global mark stack. But let's do it again. |
|
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|
2309 set_has_overflown(); |
|
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|
2310 } |
|
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|
2311 |
|
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|
2312 if (rp->processing_is_mt()) { |
|
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|
2313 assert(rp->num_q() == active_workers, "why not"); |
|
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|
2314 rp->enqueue_discovered_references(&par_task_executor); |
|
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|
2315 } else { |
|
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|
2316 rp->enqueue_discovered_references(); |
|
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|
2317 } |
|
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|
2318 |
|
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|
2319 rp->verify_no_references_recorded(); |
|
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|
2320 assert(!rp->discovery_enabled(), "Post condition"); |
|
2174
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|
2321 } |
|
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|
2322 |
|
2177
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diff
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|
2323 // Now clean up stale oops in StringTable |
|
2037
b03260081e9b
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|
2324 StringTable::unlink(&g1_is_alive); |
|
2177
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|
2325 // Clean up unreferenced symbols in symbol table. |
|
3582bf76420e
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|
2326 SymbolTable::unlink(); |
| 342 | 2327 } |
| 2328 | |
| 2329 void ConcurrentMark::swapMarkBitMaps() { | |
| 2330 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2331 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2332 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2333 } | |
| 2334 | |
| 2335 class CMRemarkTask: public AbstractGangTask { | |
| 2336 private: | |
| 2337 ConcurrentMark *_cm; | |
| 2338 | |
| 2339 public: | |
|
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7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
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|
2340 void work(uint worker_id) { |
| 342 | 2341 // Since all available tasks are actually started, we should |
| 2342 // only proceed if we're supposed to be actived. | |
|
4728
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jmasa
parents:
4711
diff
changeset
|
2343 if (worker_id < _cm->active_tasks()) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2344 CMTask* task = _cm->task(worker_id); |
| 342 | 2345 task->record_start_time(); |
| 2346 do { | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2347 task->do_marking_step(1000000000.0 /* something very large */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2348 true /* do_stealing */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2349 true /* do_termination */); |
| 342 | 2350 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2351 // If we overflow, then we do not want to restart. We instead | |
| 2352 // want to abort remark and do concurrent marking again. | |
| 2353 task->record_end_time(); | |
| 2354 } | |
| 2355 } | |
| 2356 | |
| 4711 | 2357 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2358 AbstractGangTask("Par Remark"), _cm(cm) { |
| 4711 | 2359 _cm->terminator()->reset_for_reuse(active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2360 } |
| 342 | 2361 }; |
| 2362 | |
| 2363 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2364 ResourceMark rm; | |
| 2365 HandleMark hm; | |
| 2366 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2367 | |
| 2368 g1h->ensure_parsability(false); | |
| 2369 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2370 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2371 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2372 // 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
|
2373 uint active_workers = g1h->workers()->active_workers(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2374 if (active_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2375 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
|
2376 active_workers = (uint) ParallelGCThreads; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2377 g1h->workers()->set_active_workers(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2378 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2379 set_phase(active_workers, false /* concurrent */); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2380 // Leave _parallel_marking_threads at it's |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2381 // value originally calculated in the ConcurrentMark |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2382 // constructor and pass values of the active workers |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2383 // through the gang in the task. |
| 342 | 2384 |
| 4711 | 2385 CMRemarkTask remarkTask(this, active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2386 g1h->set_par_threads(active_workers); |
| 342 | 2387 g1h->workers()->run_task(&remarkTask); |
| 2388 g1h->set_par_threads(0); | |
| 2389 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2390 G1CollectedHeap::StrongRootsScope srs(g1h); |
| 342 | 2391 // 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
|
2392 uint active_workers = 1; |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2393 set_phase(active_workers, false /* concurrent */); |
| 342 | 2394 |
| 4711 | 2395 CMRemarkTask remarkTask(this, active_workers); |
| 342 | 2396 // We will start all available threads, even if we decide that the |
| 2397 // active_workers will be fewer. The extra ones will just bail out | |
| 2398 // immediately. | |
| 2399 remarkTask.work(0); | |
| 2400 } | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2401 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2402 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2403 |
| 2404 print_stats(); | |
| 2405 | |
| 2406 #if VERIFY_OBJS_PROCESSED | |
| 2407 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
| 2408 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
| 2409 _scan_obj_cl.objs_processed, | |
| 2410 ThreadLocalObjQueue::objs_enqueued); | |
| 2411 guarantee(_scan_obj_cl.objs_processed == | |
| 2412 ThreadLocalObjQueue::objs_enqueued, | |
| 2413 "Different number of objs processed and enqueued."); | |
| 2414 } | |
| 2415 #endif | |
| 2416 } | |
| 2417 | |
| 1044 | 2418 #ifndef PRODUCT |
| 2419 | |
| 1388 | 2420 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2421 private: |
| 2422 G1CollectedHeap* _g1h; | |
| 2423 outputStream* _out; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2424 VerifyOption _vo; |
| 1388 | 2425 bool _all; |
| 342 | 2426 |
| 2427 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2428 PrintReachableOopClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2429 VerifyOption vo, |
| 1388 | 2430 bool all) : |
| 1044 | 2431 _g1h(G1CollectedHeap::heap()), |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2432 _out(out), _vo(vo), _all(all) { } |
| 342 | 2433 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2434 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
|
2435 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
|
2436 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2437 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
|
2438 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2439 const char* str = NULL; |
| 2440 const char* str2 = ""; | |
| 2441 | |
| 1388 | 2442 if (obj == NULL) { |
| 2443 str = ""; | |
| 2444 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2445 str = " O"; | |
| 2446 } else { | |
| 342 | 2447 HeapRegion* hr = _g1h->heap_region_containing(obj); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2448 guarantee(hr != NULL, "invariant"); |
| 1044 | 2449 bool over_tams = false; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2450 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2451 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2452 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2453 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2454 over_tams = hr->obj_allocated_since_prev_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2455 marked = _g1h->isMarkedPrev(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2456 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2457 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2458 over_tams = hr->obj_allocated_since_next_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2459 marked = _g1h->isMarkedNext(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2460 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2461 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2462 marked = obj->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2463 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2464 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2465 ShouldNotReachHere(); |
| 1044 | 2466 } |
| 2467 | |
| 2468 if (over_tams) { | |
| 1388 | 2469 str = " >"; |
| 2470 if (marked) { | |
| 342 | 2471 str2 = " AND MARKED"; |
| 1044 | 2472 } |
| 1388 | 2473 } else if (marked) { |
| 2474 str = " M"; | |
| 1044 | 2475 } else { |
| 1388 | 2476 str = " NOT"; |
| 1044 | 2477 } |
| 342 | 2478 } |
| 2479 | |
| 1388 | 2480 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
| 342 | 2481 p, (void*) obj, str, str2); |
| 2482 } | |
| 2483 }; | |
| 2484 | |
| 1388 | 2485 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2486 private: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2487 G1CollectedHeap* _g1h; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2488 outputStream* _out; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2489 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2490 bool _all; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2491 HeapRegion* _hr; |
| 342 | 2492 |
| 2493 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2494 PrintReachableObjectClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2495 VerifyOption vo, |
| 1388 | 2496 bool all, |
| 2497 HeapRegion* hr) : | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2498 _g1h(G1CollectedHeap::heap()), |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2499 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2500 |
| 2501 void do_object(oop o) { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2502 bool over_tams = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2503 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2504 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2505 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2506 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2507 over_tams = _hr->obj_allocated_since_prev_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2508 marked = _g1h->isMarkedPrev(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2509 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2510 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2511 over_tams = _hr->obj_allocated_since_next_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2512 marked = _g1h->isMarkedNext(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2513 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2514 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2515 marked = o->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2516 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2517 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2518 ShouldNotReachHere(); |
| 1388 | 2519 } |
| 2520 bool print_it = _all || over_tams || marked; | |
| 2521 | |
| 2522 if (print_it) { | |
| 2523 _out->print_cr(" "PTR_FORMAT"%s", | |
| 2524 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2525 PrintReachableOopClosure oopCl(_out, _vo, _all); |
| 1388 | 2526 o->oop_iterate(&oopCl); |
| 2527 } | |
| 342 | 2528 } |
| 2529 }; | |
| 2530 | |
| 1388 | 2531 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2532 private: |
| 2533 outputStream* _out; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2534 VerifyOption _vo; |
| 1388 | 2535 bool _all; |
| 342 | 2536 |
| 2537 public: | |
| 2538 bool doHeapRegion(HeapRegion* hr) { | |
| 2539 HeapWord* b = hr->bottom(); | |
| 2540 HeapWord* e = hr->end(); | |
| 2541 HeapWord* t = hr->top(); | |
| 1044 | 2542 HeapWord* p = NULL; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2543 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2544 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2545 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2546 p = hr->prev_top_at_mark_start(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2547 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2548 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2549 p = hr->next_top_at_mark_start(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2550 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2551 case VerifyOption_G1UseMarkWord: |
|
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|
2552 // When we are verifying marking using the mark word |
|
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|
2553 // TAMS has no relevance. |
|
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|
2554 assert(p == NULL, "post-condition"); |
|
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|
2555 break; |
|
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|
2556 default: |
|
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|
2557 ShouldNotReachHere(); |
| 1044 | 2558 } |
| 342 | 2559 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
| 1044 | 2560 "TAMS: "PTR_FORMAT, b, e, t, p); |
| 1388 | 2561 _out->cr(); |
| 2562 | |
| 2563 HeapWord* from = b; | |
| 2564 HeapWord* to = t; | |
| 2565 | |
| 2566 if (to > from) { | |
| 2567 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
| 2568 _out->cr(); | |
|
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|
2569 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2570 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2571 _out->cr(); | |
| 2572 } | |
| 342 | 2573 |
| 2574 return false; | |
| 2575 } | |
| 2576 | |
|
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|
2577 PrintReachableRegionClosure(outputStream* out, |
|
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|
2578 VerifyOption vo, |
| 1388 | 2579 bool all) : |
|
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|
2580 _out(out), _vo(vo), _all(all) { } |
| 342 | 2581 }; |
| 2582 | |
|
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|
2583 static const char* verify_option_to_tams(VerifyOption vo) { |
|
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|
2584 switch (vo) { |
|
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|
2585 case VerifyOption_G1UsePrevMarking: |
|
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|
2586 return "PTAMS"; |
|
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|
2587 case VerifyOption_G1UseNextMarking: |
|
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|
2588 return "NTAMS"; |
|
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|
2589 default: |
|
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|
2590 return "NONE"; |
|
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|
2591 } |
|
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|
2592 } |
|
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|
2593 |
| 1388 | 2594 void ConcurrentMark::print_reachable(const char* str, |
|
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|
2595 VerifyOption vo, |
| 1388 | 2596 bool all) { |
| 2597 gclog_or_tty->cr(); | |
| 2598 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 2599 |
| 2600 if (G1PrintReachableBaseFile == NULL) { | |
| 2601 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 2602 return; | |
| 2603 } | |
| 2604 | |
| 2605 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 2606 (JVM_MAXPATHLEN - 1)) { | |
| 2607 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 2608 return; | |
| 2609 } | |
| 2610 | |
| 2611 char file_name[JVM_MAXPATHLEN]; | |
| 2612 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 2613 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 2614 | |
| 2615 fileStream fout(file_name); | |
| 2616 if (!fout.is_open()) { | |
| 2617 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 2618 return; | |
| 2619 } | |
| 2620 | |
| 2621 outputStream* out = &fout; | |
|
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|
2622 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
| 1044 | 2623 out->cr(); |
| 2624 | |
| 1388 | 2625 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2626 out->cr(); |
|
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|
2627 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 2628 _g1h->heap_region_iterate(&rcl); |
| 1044 | 2629 out->cr(); |
| 2630 | |
| 2631 gclog_or_tty->print_cr(" done"); | |
| 1388 | 2632 gclog_or_tty->flush(); |
| 342 | 2633 } |
| 2634 | |
| 1044 | 2635 #endif // PRODUCT |
| 2636 | |
|
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|
2637 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 2638 // Note we are overriding the read-only view of the prev map here, via |
| 2639 // the cast. | |
| 2640 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
|
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|
2641 } |
|
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|
2642 |
|
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|
2643 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 2644 _nextMarkBitMap->clearRange(mr); |
| 2645 } | |
| 2646 | |
|
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|
2647 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
|
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|
2648 clearRangePrevBitmap(mr); |
|
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|
2649 clearRangeNextBitmap(mr); |
|
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|
2650 } |
|
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|
2651 |
| 342 | 2652 HeapRegion* |
| 2653 ConcurrentMark::claim_region(int task_num) { | |
| 2654 // "checkpoint" the finger | |
| 2655 HeapWord* finger = _finger; | |
| 2656 | |
| 2657 // _heap_end will not change underneath our feet; it only changes at | |
| 2658 // yield points. | |
| 2659 while (finger < _heap_end) { | |
|
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|
2660 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 2661 |
| 3771 | 2662 // Note on how this code handles humongous regions. In the |
| 2663 // normal case the finger will reach the start of a "starts | |
| 2664 // humongous" (SH) region. Its end will either be the end of the | |
| 2665 // last "continues humongous" (CH) region in the sequence, or the | |
| 2666 // standard end of the SH region (if the SH is the only region in | |
| 2667 // the sequence). That way claim_region() will skip over the CH | |
| 2668 // regions. However, there is a subtle race between a CM thread | |
| 2669 // executing this method and a mutator thread doing a humongous | |
| 2670 // object allocation. The two are not mutually exclusive as the CM | |
| 2671 // thread does not need to hold the Heap_lock when it gets | |
| 2672 // here. So there is a chance that claim_region() will come across | |
| 2673 // a free region that's in the progress of becoming a SH or a CH | |
| 2674 // region. In the former case, it will either | |
| 2675 // a) Miss the update to the region's end, in which case it will | |
| 2676 // visit every subsequent CH region, will find their bitmaps | |
| 2677 // empty, and do nothing, or | |
| 2678 // b) Will observe the update of the region's end (in which case | |
| 2679 // it will skip the subsequent CH regions). | |
| 2680 // If it comes across a region that suddenly becomes CH, the | |
| 2681 // scenario will be similar to b). So, the race between | |
| 2682 // claim_region() and a humongous object allocation might force us | |
| 2683 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 2684 // iterations) but it should not introduce and correctness issues. | |
| 2685 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
| 342 | 2686 HeapWord* bottom = curr_region->bottom(); |
| 2687 HeapWord* end = curr_region->end(); | |
| 2688 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 2689 | |
| 3771 | 2690 if (verbose_low()) { |
| 342 | 2691 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
| 2692 "["PTR_FORMAT", "PTR_FORMAT"), " | |
| 2693 "limit = "PTR_FORMAT, | |
| 2694 task_num, curr_region, bottom, end, limit); | |
| 3771 | 2695 } |
| 2696 | |
| 2697 // Is the gap between reading the finger and doing the CAS too long? | |
| 2698 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 342 | 2699 if (res == finger) { |
| 2700 // we succeeded | |
| 2701 | |
| 2702 // notice that _finger == end cannot be guaranteed here since, | |
| 2703 // someone else might have moved the finger even further | |
|
1023
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|
2704 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 2705 |
|
3776
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|
2706 if (verbose_low()) { |
| 342 | 2707 gclog_or_tty->print_cr("[%d] we were successful with region = " |
| 2708 PTR_FORMAT, task_num, curr_region); | |
|
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|
2709 } |
| 342 | 2710 |
| 2711 if (limit > bottom) { | |
|
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|
2712 if (verbose_low()) { |
| 342 | 2713 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
| 2714 "returning it ", task_num, curr_region); | |
|
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|
2715 } |
| 342 | 2716 return curr_region; |
| 2717 } else { | |
|
1023
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|
2718 assert(limit == bottom, |
|
11d4857fe5e1
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1022
diff
changeset
|
2719 "the region limit should be at bottom"); |
|
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|
2720 if (verbose_low()) { |
| 342 | 2721 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
| 2722 "returning NULL", task_num, curr_region); | |
|
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|
2723 } |
| 342 | 2724 // we return NULL and the caller should try calling |
| 2725 // claim_region() again. | |
| 2726 return NULL; | |
| 2727 } | |
| 2728 } else { | |
|
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|
2729 assert(_finger > finger, "the finger should have moved forward"); |
|
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|
2730 if (verbose_low()) { |
| 342 | 2731 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
| 2732 "global finger = "PTR_FORMAT", " | |
| 2733 "our finger = "PTR_FORMAT, | |
| 2734 task_num, _finger, finger); | |
|
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|
2735 } |
| 342 | 2736 |
| 2737 // read it again | |
| 2738 finger = _finger; | |
| 2739 } | |
| 2740 } | |
| 2741 | |
| 2742 return NULL; | |
| 2743 } | |
| 2744 | |
|
4787
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|
2745 #ifndef PRODUCT |
|
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|
2746 enum VerifyNoCSetOopsPhase { |
|
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|
2747 VerifyNoCSetOopsStack, |
|
2ace1c4ee8da
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|
2748 VerifyNoCSetOopsQueues, |
|
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|
2749 VerifyNoCSetOopsSATBCompleted, |
|
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|
2750 VerifyNoCSetOopsSATBThread |
|
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|
2751 }; |
|
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|
2752 |
|
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|
2753 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
|
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|
2754 private: |
|
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|
2755 G1CollectedHeap* _g1h; |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2756 VerifyNoCSetOopsPhase _phase; |
|
2ace1c4ee8da
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|
2757 int _info; |
|
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|
2758 |
|
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|
2759 const char* phase_str() { |
|
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|
2760 switch (_phase) { |
|
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diff
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|
2761 case VerifyNoCSetOopsStack: return "Stack"; |
|
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|
2762 case VerifyNoCSetOopsQueues: return "Queue"; |
|
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|
2763 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
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|
2764 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
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|
2765 default: ShouldNotReachHere(); |
|
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|
2766 } |
|
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|
2767 return NULL; |
|
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|
2768 } |
|
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|
2769 |
|
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|
2770 void do_object_work(oop obj) { |
|
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|
2771 guarantee(!_g1h->obj_in_cs(obj), |
|
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|
2772 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
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|
2773 (void*) obj, phase_str(), _info)); |
|
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|
2774 } |
|
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|
2775 |
|
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|
2776 public: |
|
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|
2777 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
|
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|
2778 |
|
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|
2779 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
2ace1c4ee8da
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|
2780 _phase = phase; |
|
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4783
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changeset
|
2781 _info = info; |
|
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|
2782 } |
|
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|
2783 |
|
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|
2784 virtual void do_oop(oop* p) { |
|
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2785 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2786 do_object_work(obj); |
|
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|
2787 } |
|
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|
2788 |
|
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|
2789 virtual void do_oop(narrowOop* p) { |
|
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2790 // We should not come across narrow oops while scanning marking |
|
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2791 // stacks and SATB buffers. |
|
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|
2792 ShouldNotReachHere(); |
|
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|
2793 } |
|
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|
2794 |
|
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|
2795 virtual void do_object(oop obj) { |
|
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2796 do_object_work(obj); |
|
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2797 } |
|
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|
2798 }; |
|
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2799 |
|
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2800 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
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2801 bool verify_enqueued_buffers, |
|
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2802 bool verify_thread_buffers, |
|
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2803 bool verify_fingers) { |
|
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2804 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
|
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2805 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
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2806 return; |
| 342 | 2807 } |
|
1835
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2808 |
|
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2809 VerifyNoCSetOopsClosure cl; |
|
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2810 |
|
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|
2811 if (verify_stacks) { |
|
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2812 // Verify entries on the global mark stack |
|
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2813 cl.set_phase(VerifyNoCSetOopsStack); |
|
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2814 _markStack.oops_do(&cl); |
|
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2815 |
|
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|
2816 // Verify entries on the task queues |
|
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2817 for (int i = 0; i < (int) _max_task_num; i += 1) { |
|
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|
2818 cl.set_phase(VerifyNoCSetOopsQueues, i); |
|
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2819 OopTaskQueue* queue = _task_queues->queue(i); |
|
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|
2820 queue->oops_do(&cl); |
|
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|
2821 } |
|
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|
2822 } |
|
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|
2823 |
|
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|
2824 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
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|
2825 |
|
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|
2826 // Verify entries on the enqueued SATB buffers |
|
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|
2827 if (verify_enqueued_buffers) { |
|
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|
2828 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
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|
2829 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
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|
2830 } |
|
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|
2831 |
|
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|
2832 // Verify entries on the per-thread SATB buffers |
|
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|
2833 if (verify_thread_buffers) { |
|
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|
2834 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
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|
2835 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
4805b9f4779e
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|
2836 } |
|
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|
2837 |
|
4787
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|
2838 if (verify_fingers) { |
|
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|
2839 // Verify the global finger |
|
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|
2840 HeapWord* global_finger = finger(); |
|
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|
2841 if (global_finger != NULL && global_finger < _heap_end) { |
|
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|
2842 // The global finger always points to a heap region boundary. We |
|
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|
2843 // use heap_region_containing_raw() to get the containing region |
|
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|
2844 // given that the global finger could be pointing to a free region |
|
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|
2845 // which subsequently becomes continues humongous. If that |
|
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|
2846 // happens, heap_region_containing() will return the bottom of the |
|
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|
2847 // corresponding starts humongous region and the check below will |
|
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|
2848 // not hold any more. |
|
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|
2849 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
|
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|
2850 guarantee(global_finger == global_hr->bottom(), |
|
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|
2851 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
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|
2852 global_finger, HR_FORMAT_PARAMS(global_hr))); |
|
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|
2853 } |
|
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|
2854 |
|
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|
2855 // Verify the task fingers |
|
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|
2856 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
2ace1c4ee8da
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|
2857 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
|
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|
2858 CMTask* task = _tasks[i]; |
|
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|
2859 HeapWord* task_finger = task->finger(); |
|
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|
2860 if (task_finger != NULL && task_finger < _heap_end) { |
|
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|
2861 // See above note on the global finger verification. |
|
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|
2862 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
|
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|
2863 guarantee(task_finger == task_hr->bottom() || |
|
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|
2864 !task_hr->in_collection_set(), |
|
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|
2865 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
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|
2866 task_finger, HR_FORMAT_PARAMS(task_hr))); |
|
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|
2867 } |
|
2ace1c4ee8da
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|
2868 } |
|
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|
2869 } |
| 342 | 2870 } |
|
4787
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|
2871 #endif // PRODUCT |
| 342 | 2872 |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2873 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
| 342 | 2874 _markStack.setEmpty(); |
| 2875 _markStack.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
diff
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|
2876 if (clear_overflow) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
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|
2877 clear_has_overflown(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
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|
2878 } else { |
|
cd8e33b2a8ad
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2436
diff
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|
2879 assert(has_overflown(), "pre-condition"); |
|
cd8e33b2a8ad
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diff
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|
2880 } |
| 342 | 2881 _finger = _heap_start; |
| 2882 | |
| 2883 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 2884 OopTaskQueue* queue = _task_queues->queue(i); | |
| 2885 queue->set_empty(); | |
| 2886 } | |
| 2887 } | |
| 2888 | |
|
4836
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|
2889 // Aggregate the counting data that was constructed concurrently |
|
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diff
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|
2890 // with marking. |
|
d30fa85f9994
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diff
changeset
|
2891 class AggregateCountDataHRClosure: public HeapRegionClosure { |
|
d30fa85f9994
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|
2892 ConcurrentMark* _cm; |
|
d30fa85f9994
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|
2893 BitMap* _cm_card_bm; |
|
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|
2894 size_t _max_task_num; |
|
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|
2895 |
|
d30fa85f9994
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diff
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|
2896 public: |
|
d30fa85f9994
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diff
changeset
|
2897 AggregateCountDataHRClosure(ConcurrentMark *cm, |
|
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|
2898 BitMap* cm_card_bm, |
|
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|
2899 size_t max_task_num) : |
|
d30fa85f9994
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diff
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|
2900 _cm(cm), _cm_card_bm(cm_card_bm), |
|
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|
2901 _max_task_num(max_task_num) { } |
|
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|
2902 |
|
d30fa85f9994
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|
2903 bool is_card_aligned(HeapWord* p) { |
|
d30fa85f9994
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diff
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|
2904 return ((uintptr_t(p) & (CardTableModRefBS::card_size - 1)) == 0); |
|
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|
2905 } |
|
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diff
changeset
|
2906 |
|
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diff
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|
2907 bool doHeapRegion(HeapRegion* hr) { |
|
d30fa85f9994
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4830
diff
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|
2908 if (hr->continuesHumongous()) { |
|
d30fa85f9994
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4830
diff
changeset
|
2909 // We will ignore these here and process them when their |
|
d30fa85f9994
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4830
diff
changeset
|
2910 // associated "starts humongous" region is processed. |
|
d30fa85f9994
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4830
diff
changeset
|
2911 // Note that we cannot rely on their associated |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
2912 // "starts humongous" region to have their bit set to 1 |
|
d30fa85f9994
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diff
changeset
|
2913 // since, due to the region chunking in the parallel region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2914 // iteration, a "continues humongous" region might be visited |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2915 // before its associated "starts humongous". |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2916 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2917 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2918 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2919 HeapWord* start = hr->bottom(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2920 HeapWord* limit = hr->next_top_at_mark_start(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2921 HeapWord* end = hr->end(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2922 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2923 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2924 err_msg("Preconditions not met - " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2925 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2926 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2927 start, limit, hr->top(), hr->end())); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2928 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2929 assert(hr->next_marked_bytes() == 0, "Precondition"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2930 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2931 if (start == limit) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2932 // NTAMS of this region has not been set so nothing to do. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2933 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2934 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2935 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2936 assert(is_card_aligned(start), "sanity"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2937 assert(is_card_aligned(end), "sanity"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2938 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2939 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2940 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2941 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2942 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2943 // If ntams is not card aligned then we bump the index for |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2944 // limit so that we get the card spanning ntams. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2945 if (!is_card_aligned(limit)) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2946 limit_idx += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2947 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2948 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2949 assert(limit_idx <= end_idx, "or else use atomics"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2950 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2951 // Aggregate the "stripe" in the count data associated with hr. |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2952 uint hrs_index = hr->hrs_index(); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2953 size_t marked_bytes = 0; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2954 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2955 for (int i = 0; (size_t)i < _max_task_num; i += 1) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2956 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2957 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2958 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2959 // Fetch the marked_bytes in this region for task i and |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2960 // add it to the running total for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2961 marked_bytes += marked_bytes_array[hrs_index]; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2962 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2963 // Now union the bitmaps[0,max_task_num)[start_idx..limit_idx) |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2964 // into the global card bitmap. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2965 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2966 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2967 while (scan_idx < limit_idx) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2968 assert(task_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2969 _cm_card_bm->set_bit(scan_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2970 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2971 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2972 // BitMap::get_next_one_offset() can handle the case when |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2973 // its left_offset parameter is greater than its right_offset |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2974 // parameter. If does, however, have an early exit if |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2975 // left_offset == right_offset. So let's limit the value |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2976 // passed in for left offset here. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2977 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2978 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2979 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2980 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2981 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2982 // Update the marked bytes for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2983 hr->add_to_marked_bytes(marked_bytes); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2984 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2985 // Next heap region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2986 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2987 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2988 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2989 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2990 class G1AggregateCountDataTask: public AbstractGangTask { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2991 protected: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2992 G1CollectedHeap* _g1h; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2993 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2994 BitMap* _cm_card_bm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2995 size_t _max_task_num; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2996 int _active_workers; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2997 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2998 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2999 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3000 ConcurrentMark* cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3001 BitMap* cm_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3002 size_t max_task_num, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3003 int n_workers) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3004 AbstractGangTask("Count Aggregation"), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3005 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3006 _max_task_num(max_task_num), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3007 _active_workers(n_workers) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3008 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3009 void work(uint worker_id) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3010 AggregateCountDataHRClosure cl(_cm, _cm_card_bm, _max_task_num); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3011 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3012 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3013 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3014 _active_workers, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3015 HeapRegion::AggregateCountClaimValue); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3016 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3017 _g1h->heap_region_iterate(&cl); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3018 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3019 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3020 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3021 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3022 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3023 void ConcurrentMark::aggregate_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3024 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3025 _g1h->workers()->active_workers() : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3026 1); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3027 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3028 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3029 _max_task_num, n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3030 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3031 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3032 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3033 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
3034 _g1h->set_par_threads(n_workers); |
|
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|
3035 _g1h->workers()->run_task(&g1_par_agg_task); |
|
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|
3036 _g1h->set_par_threads(0); |
|
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|
3037 |
|
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|
3038 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
|
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|
3039 "sanity check"); |
|
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|
3040 _g1h->reset_heap_region_claim_values(); |
|
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|
3041 } else { |
|
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|
3042 g1_par_agg_task.work(0); |
|
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|
3043 } |
|
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|
3044 } |
|
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|
3045 |
|
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|
3046 // Clear the per-worker arrays used to store the per-region counting data |
|
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|
3047 void ConcurrentMark::clear_all_count_data() { |
|
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3048 // Clear the global card bitmap - it will be filled during |
|
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3049 // liveness count aggregation (during remark) and the |
|
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|
3050 // final counting task. |
|
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|
3051 _card_bm.clear(); |
|
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|
3052 |
|
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|
3053 // Clear the global region bitmap - it will be filled as part |
|
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|
3054 // of the final counting task. |
|
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|
3055 _region_bm.clear(); |
|
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3056 |
|
6010
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3057 uint max_regions = _g1h->max_regions(); |
|
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3058 assert(_max_task_num != 0, "unitialized"); |
|
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3059 |
|
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|
3060 for (int i = 0; (size_t) i < _max_task_num; i += 1) { |
|
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3061 BitMap* task_card_bm = count_card_bitmap_for(i); |
|
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3062 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
|
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3063 |
|
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|
3064 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
|
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3065 assert(marked_bytes_array != NULL, "uninitialized"); |
|
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3066 |
|
6010
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|
3067 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
|
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3068 task_card_bm->clear(); |
|
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|
3069 } |
|
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|
3070 } |
|
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|
3071 |
| 342 | 3072 void ConcurrentMark::print_stats() { |
| 3073 if (verbose_stats()) { | |
| 3074 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3075 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3076 _tasks[i]->print_stats(); | |
| 3077 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3078 } | |
| 3079 } | |
| 3080 } | |
| 3081 | |
| 3082 // abandon current marking iteration due to a Full GC | |
| 3083 void ConcurrentMark::abort() { | |
| 3084 // Clear all marks to force marking thread to do nothing | |
| 3085 _nextMarkBitMap->clearAll(); | |
|
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|
3086 // Clear the liveness counting data |
|
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|
3087 clear_all_count_data(); |
| 342 | 3088 // Empty mark stack |
| 3089 clear_marking_state(); | |
|
1835
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|
3090 for (int i = 0; i < (int)_max_task_num; ++i) { |
| 342 | 3091 _tasks[i]->clear_region_fields(); |
|
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|
3092 } |
| 342 | 3093 _has_aborted = true; |
| 3094 | |
| 3095 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3096 satb_mq_set.abandon_partial_marking(); | |
|
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|
3097 // This can be called either during or outside marking, we'll read |
|
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|
3098 // the expected_active value from the SATB queue set. |
|
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|
3099 satb_mq_set.set_active_all_threads( |
|
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|
3100 false, /* new active value */ |
|
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|
3101 satb_mq_set.is_active() /* expected_active */); |
| 342 | 3102 } |
| 3103 | |
| 3104 static void print_ms_time_info(const char* prefix, const char* name, | |
| 3105 NumberSeq& ns) { | |
| 3106 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3107 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3108 if (ns.num() > 0) { | |
| 3109 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3110 prefix, ns.sd(), ns.maximum()); | |
| 3111 } | |
| 3112 } | |
| 3113 | |
| 3114 void ConcurrentMark::print_summary_info() { | |
| 3115 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3116 print_ms_time_info(" ", "init marks", _init_times); | |
| 3117 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3118 { | |
| 3119 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3120 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3121 | |
| 3122 } | |
| 3123 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3124 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3125 _total_counting_time, | |
| 3126 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3127 (double)_cleanup_times.num() | |
| 3128 : 0.0)); | |
| 3129 if (G1ScrubRemSets) { | |
| 3130 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3131 _total_rs_scrub_time, | |
| 3132 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3133 (double)_cleanup_times.num() | |
| 3134 : 0.0)); | |
| 3135 } | |
| 3136 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3137 (_init_times.sum() + _remark_times.sum() + | |
| 3138 _cleanup_times.sum())/1000.0); | |
| 3139 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
|
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|
3140 "(%8.2f s marking).", |
| 342 | 3141 cmThread()->vtime_accum(), |
|
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|
3142 cmThread()->vtime_mark_accum()); |
| 342 | 3143 } |
| 3144 | |
| 1019 | 3145 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
| 3146 _parallel_workers->print_worker_threads_on(st); | |
| 3147 } | |
| 3148 | |
| 342 | 3149 // We take a break if someone is trying to stop the world. |
|
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|
3150 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 342 | 3151 if (should_yield()) { |
|
4728
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|
3152 if (worker_id == 0) { |
| 342 | 3153 _g1h->g1_policy()->record_concurrent_pause(); |
|
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|
3154 } |
| 342 | 3155 cmThread()->yield(); |
|
4728
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|
3156 if (worker_id == 0) { |
| 342 | 3157 _g1h->g1_policy()->record_concurrent_pause_end(); |
|
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|
3158 } |
| 342 | 3159 return true; |
| 3160 } else { | |
| 3161 return false; | |
| 3162 } | |
| 3163 } | |
| 3164 | |
| 3165 bool ConcurrentMark::should_yield() { | |
| 3166 return cmThread()->should_yield(); | |
| 3167 } | |
| 3168 | |
| 3169 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 3170 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 3171 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 3172 } | |
| 3173 | |
| 3174 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 3175 void* last) { | |
|
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|
3176 return containing_card_is_marked(start) && |
|
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|
3177 containing_card_is_marked(last); |
| 342 | 3178 } |
| 3179 | |
| 3180 #ifndef PRODUCT | |
| 3181 // for debugging purposes | |
| 3182 void ConcurrentMark::print_finger() { | |
| 3183 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
| 3184 _heap_start, _heap_end, _finger); | |
| 3185 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 3186 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
| 3187 } | |
| 3188 gclog_or_tty->print_cr(""); | |
| 3189 } | |
| 3190 #endif | |
| 3191 | |
| 3771 | 3192 void CMTask::scan_object(oop obj) { |
| 3193 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3194 | |
| 3195 if (_cm->verbose_high()) { | |
| 3196 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
| 3197 _task_id, (void*) obj); | |
| 3198 } | |
| 3199 | |
| 3200 size_t obj_size = obj->size(); | |
| 3201 _words_scanned += obj_size; | |
| 3202 | |
| 3203 obj->oop_iterate(_cm_oop_closure); | |
| 3204 statsOnly( ++_objs_scanned ); | |
| 3205 check_limits(); | |
| 3206 } | |
| 3207 | |
| 342 | 3208 // Closure for iteration over bitmaps |
| 3209 class CMBitMapClosure : public BitMapClosure { | |
| 3210 private: | |
| 3211 // the bitmap that is being iterated over | |
| 3212 CMBitMap* _nextMarkBitMap; | |
| 3213 ConcurrentMark* _cm; | |
| 3214 CMTask* _task; | |
| 3215 | |
| 3216 public: | |
|
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|
3217 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
|
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|
3218 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
| 342 | 3219 |
| 3220 bool do_bit(size_t offset) { | |
| 3221 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
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|
3222 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
|
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|
3223 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3224 |
|
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|
3225 statsOnly( _task->increase_objs_found_on_bitmap() ); |
|
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|
3226 assert(addr >= _task->finger(), "invariant"); |
|
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|
3227 |
|
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|
3228 // We move that task's local finger along. |
|
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|
3229 _task->move_finger_to(addr); |
| 342 | 3230 |
| 3231 _task->scan_object(oop(addr)); | |
| 3232 // we only partially drain the local queue and global stack | |
| 3233 _task->drain_local_queue(true); | |
| 3234 _task->drain_global_stack(true); | |
| 3235 | |
| 3236 // if the has_aborted flag has been raised, we need to bail out of | |
| 3237 // the iteration | |
| 3238 return !_task->has_aborted(); | |
| 3239 } | |
| 3240 }; | |
| 3241 | |
| 3242 // Closure for iterating over objects, currently only used for | |
| 3243 // processing SATB buffers. | |
| 3244 class CMObjectClosure : public ObjectClosure { | |
| 3245 private: | |
| 3246 CMTask* _task; | |
| 3247 | |
| 3248 public: | |
| 3249 void do_object(oop obj) { | |
| 3250 _task->deal_with_reference(obj); | |
| 3251 } | |
| 3252 | |
| 3253 CMObjectClosure(CMTask* task) : _task(task) { } | |
| 3254 }; | |
| 3255 | |
| 3771 | 3256 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 3257 ConcurrentMark* cm, | |
| 3258 CMTask* task) | |
| 3259 : _g1h(g1h), _cm(cm), _task(task) { | |
| 3260 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 3261 | |
| 3262 if (G1UseConcMarkReferenceProcessing) { | |
|
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|
3263 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 3264 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 3265 } |
| 3771 | 3266 } |
| 342 | 3267 |
| 3268 void CMTask::setup_for_region(HeapRegion* hr) { | |
|
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|
3269 // Separated the asserts so that we know which one fires. |
|
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|
3270 assert(hr != NULL, |
|
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|
3271 "claim_region() should have filtered out continues humongous regions"); |
|
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|
3272 assert(!hr->continuesHumongous(), |
|
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|
3273 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 3274 |
|
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|
3275 if (_cm->verbose_low()) { |
| 342 | 3276 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
| 3277 _task_id, hr); | |
|
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|
3278 } |
| 342 | 3279 |
| 3280 _curr_region = hr; | |
| 3281 _finger = hr->bottom(); | |
| 3282 update_region_limit(); | |
| 3283 } | |
| 3284 | |
| 3285 void CMTask::update_region_limit() { | |
| 3286 HeapRegion* hr = _curr_region; | |
| 3287 HeapWord* bottom = hr->bottom(); | |
| 3288 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 3289 | |
| 3290 if (limit == bottom) { | |
|
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|
3291 if (_cm->verbose_low()) { |
| 342 | 3292 gclog_or_tty->print_cr("[%d] found an empty region " |
| 3293 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 3294 _task_id, bottom, limit); | |
|
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3295 } |
| 342 | 3296 // The region was collected underneath our feet. |
| 3297 // We set the finger to bottom to ensure that the bitmap | |
| 3298 // iteration that will follow this will not do anything. | |
| 3299 // (this is not a condition that holds when we set the region up, | |
| 3300 // as the region is not supposed to be empty in the first place) | |
| 3301 _finger = bottom; | |
| 3302 } else if (limit >= _region_limit) { | |
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3303 assert(limit >= _finger, "peace of mind"); |
| 342 | 3304 } else { |
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3305 assert(limit < _region_limit, "only way to get here"); |
| 342 | 3306 // This can happen under some pretty unusual circumstances. An |
| 3307 // evacuation pause empties the region underneath our feet (NTAMS | |
| 3308 // at bottom). We then do some allocation in the region (NTAMS | |
| 3309 // stays at bottom), followed by the region being used as a GC | |
| 3310 // alloc region (NTAMS will move to top() and the objects | |
| 3311 // originally below it will be grayed). All objects now marked in | |
| 3312 // the region are explicitly grayed, if below the global finger, | |
| 3313 // and we do not need in fact to scan anything else. So, we simply | |
| 3314 // set _finger to be limit to ensure that the bitmap iteration | |
| 3315 // doesn't do anything. | |
| 3316 _finger = limit; | |
| 3317 } | |
| 3318 | |
| 3319 _region_limit = limit; | |
| 3320 } | |
| 3321 | |
| 3322 void CMTask::giveup_current_region() { | |
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3323 assert(_curr_region != NULL, "invariant"); |
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3324 if (_cm->verbose_low()) { |
| 342 | 3325 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
| 3326 _task_id, _curr_region); | |
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3327 } |
| 342 | 3328 clear_region_fields(); |
| 3329 } | |
| 3330 | |
| 3331 void CMTask::clear_region_fields() { | |
| 3332 // Values for these three fields that indicate that we're not | |
| 3333 // holding on to a region. | |
| 3334 _curr_region = NULL; | |
| 3335 _finger = NULL; | |
| 3336 _region_limit = NULL; | |
| 3337 } | |
| 3338 | |
| 3771 | 3339 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 3340 if (cm_oop_closure == NULL) { | |
| 3341 assert(_cm_oop_closure != NULL, "invariant"); | |
| 3342 } else { | |
| 3343 assert(_cm_oop_closure == NULL, "invariant"); | |
| 3344 } | |
| 3345 _cm_oop_closure = cm_oop_closure; | |
| 3346 } | |
| 3347 | |
| 342 | 3348 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3349 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 3350 |
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3351 if (_cm->verbose_low()) { |
| 342 | 3352 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
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3353 } |
| 342 | 3354 |
| 3355 _nextMarkBitMap = nextMarkBitMap; | |
| 3356 clear_region_fields(); | |
| 3357 | |
| 3358 _calls = 0; | |
| 3359 _elapsed_time_ms = 0.0; | |
| 3360 _termination_time_ms = 0.0; | |
| 3361 _termination_start_time_ms = 0.0; | |
| 3362 | |
| 3363 #if _MARKING_STATS_ | |
| 3364 _local_pushes = 0; | |
| 3365 _local_pops = 0; | |
| 3366 _local_max_size = 0; | |
| 3367 _objs_scanned = 0; | |
| 3368 _global_pushes = 0; | |
| 3369 _global_pops = 0; | |
| 3370 _global_max_size = 0; | |
| 3371 _global_transfers_to = 0; | |
| 3372 _global_transfers_from = 0; | |
| 3373 _regions_claimed = 0; | |
| 3374 _objs_found_on_bitmap = 0; | |
| 3375 _satb_buffers_processed = 0; | |
| 3376 _steal_attempts = 0; | |
| 3377 _steals = 0; | |
| 3378 _aborted = 0; | |
| 3379 _aborted_overflow = 0; | |
| 3380 _aborted_cm_aborted = 0; | |
| 3381 _aborted_yield = 0; | |
| 3382 _aborted_timed_out = 0; | |
| 3383 _aborted_satb = 0; | |
| 3384 _aborted_termination = 0; | |
| 3385 #endif // _MARKING_STATS_ | |
| 3386 } | |
| 3387 | |
| 3388 bool CMTask::should_exit_termination() { | |
| 3389 regular_clock_call(); | |
| 3390 // This is called when we are in the termination protocol. We should | |
| 3391 // quit if, for some reason, this task wants to abort or the global | |
| 3392 // stack is not empty (this means that we can get work from it). | |
| 3393 return !_cm->mark_stack_empty() || has_aborted(); | |
| 3394 } | |
| 3395 | |
| 3396 void CMTask::reached_limit() { | |
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3397 assert(_words_scanned >= _words_scanned_limit || |
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3398 _refs_reached >= _refs_reached_limit , |
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3399 "shouldn't have been called otherwise"); |
| 342 | 3400 regular_clock_call(); |
| 3401 } | |
| 3402 | |
| 3403 void CMTask::regular_clock_call() { | |
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3404 if (has_aborted()) return; |
| 342 | 3405 |
| 3406 // First, we need to recalculate the words scanned and refs reached | |
| 3407 // limits for the next clock call. | |
| 3408 recalculate_limits(); | |
| 3409 | |
| 3410 // During the regular clock call we do the following | |
| 3411 | |
| 3412 // (1) If an overflow has been flagged, then we abort. | |
| 3413 if (_cm->has_overflown()) { | |
| 3414 set_has_aborted(); | |
| 3415 return; | |
| 3416 } | |
| 3417 | |
| 3418 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 3419 // to check anything else. The other steps are only needed during | |
| 3420 // the concurrent marking phase. | |
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3421 if (!concurrent()) return; |
| 342 | 3422 |
| 3423 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 3424 if (_cm->has_aborted()) { | |
| 3425 set_has_aborted(); | |
| 3426 statsOnly( ++_aborted_cm_aborted ); | |
| 3427 return; | |
| 3428 } | |
| 3429 | |
| 3430 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 3431 | |
| 3432 // (3) If marking stats are enabled, then we update the step history. | |
| 3433 #if _MARKING_STATS_ | |
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3434 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 3435 ++_clock_due_to_scanning; |
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3436 } |
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3437 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 3438 ++_clock_due_to_marking; |
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3439 } |
| 342 | 3440 |
| 3441 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 3442 _interval_start_time_ms = curr_time_ms; | |
| 3443 _all_clock_intervals_ms.add(last_interval_ms); | |
| 3444 | |
| 3445 if (_cm->verbose_medium()) { | |
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3446 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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3447 "scanned = %d%s, refs reached = %d%s", |
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3448 _task_id, last_interval_ms, |
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3449 _words_scanned, |
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3450 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3451 _refs_reached, |
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3452 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 3453 } |
| 3454 #endif // _MARKING_STATS_ | |
| 3455 | |
| 3456 // (4) We check whether we should yield. If we have to, then we abort. | |
| 3457 if (_cm->should_yield()) { | |
| 3458 // We should yield. To do this we abort the task. The caller is | |
| 3459 // responsible for yielding. | |
| 3460 set_has_aborted(); | |
| 3461 statsOnly( ++_aborted_yield ); | |
| 3462 return; | |
| 3463 } | |
| 3464 | |
| 3465 // (5) We check whether we've reached our time quota. If we have, | |
| 3466 // then we abort. | |
| 3467 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 3468 if (elapsed_time_ms > _time_target_ms) { | |
| 3469 set_has_aborted(); | |
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3470 _has_timed_out = true; |
| 342 | 3471 statsOnly( ++_aborted_timed_out ); |
| 3472 return; | |
| 3473 } | |
| 3474 | |
| 3475 // (6) Finally, we check whether there are enough completed STAB | |
| 3476 // buffers available for processing. If there are, we abort. | |
| 3477 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3478 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3479 if (_cm->verbose_low()) { |
| 342 | 3480 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
| 3481 _task_id); | |
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3482 } |
| 342 | 3483 // we do need to process SATB buffers, we'll abort and restart |
| 3484 // the marking task to do so | |
| 3485 set_has_aborted(); | |
| 3486 statsOnly( ++_aborted_satb ); | |
| 3487 return; | |
| 3488 } | |
| 3489 } | |
| 3490 | |
| 3491 void CMTask::recalculate_limits() { | |
| 3492 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 3493 _words_scanned_limit = _real_words_scanned_limit; | |
| 3494 | |
| 3495 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 3496 _refs_reached_limit = _real_refs_reached_limit; | |
| 3497 } | |
| 3498 | |
| 3499 void CMTask::decrease_limits() { | |
| 3500 // This is called when we believe that we're going to do an infrequent | |
| 3501 // operation which will increase the per byte scanned cost (i.e. move | |
| 3502 // entries to/from the global stack). It basically tries to decrease the | |
| 3503 // scanning limit so that the clock is called earlier. | |
| 3504 | |
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3505 if (_cm->verbose_medium()) { |
| 342 | 3506 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
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3507 } |
| 342 | 3508 |
| 3509 _words_scanned_limit = _real_words_scanned_limit - | |
| 3510 3 * words_scanned_period / 4; | |
| 3511 _refs_reached_limit = _real_refs_reached_limit - | |
| 3512 3 * refs_reached_period / 4; | |
| 3513 } | |
| 3514 | |
| 3515 void CMTask::move_entries_to_global_stack() { | |
| 3516 // local array where we'll store the entries that will be popped | |
| 3517 // from the local queue | |
| 3518 oop buffer[global_stack_transfer_size]; | |
| 3519 | |
| 3520 int n = 0; | |
| 3521 oop obj; | |
| 3522 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 3523 buffer[n] = obj; | |
| 3524 ++n; | |
| 3525 } | |
| 3526 | |
| 3527 if (n > 0) { | |
| 3528 // we popped at least one entry from the local queue | |
| 3529 | |
| 3530 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 3531 | |
| 3532 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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3533 if (_cm->verbose_low()) { |
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3534 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
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3535 _task_id); |
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3536 } |
| 342 | 3537 set_has_aborted(); |
| 3538 } else { | |
| 3539 // the transfer was successful | |
| 3540 | |
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3541 if (_cm->verbose_medium()) { |
| 342 | 3542 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
| 3543 _task_id, n); | |
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3544 } |
| 342 | 3545 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3546 if (tmp_size > _global_max_size) { |
| 342 | 3547 _global_max_size = tmp_size; |
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3548 } |
| 342 | 3549 _global_pushes += n ); |
| 3550 } | |
| 3551 } | |
| 3552 | |
| 3553 // this operation was quite expensive, so decrease the limits | |
| 3554 decrease_limits(); | |
| 3555 } | |
| 3556 | |
| 3557 void CMTask::get_entries_from_global_stack() { | |
| 3558 // local array where we'll store the entries that will be popped | |
| 3559 // from the global stack. | |
| 3560 oop buffer[global_stack_transfer_size]; | |
| 3561 int n; | |
| 3562 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3563 assert(n <= global_stack_transfer_size, |
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3564 "we should not pop more than the given limit"); |
| 342 | 3565 if (n > 0) { |
| 3566 // yes, we did actually pop at least one entry | |
| 3567 | |
| 3568 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3569 if (_cm->verbose_medium()) { |
| 342 | 3570 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
| 3571 _task_id, n); | |
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3572 } |
| 342 | 3573 for (int i = 0; i < n; ++i) { |
| 3574 bool success = _task_queue->push(buffer[i]); | |
| 3575 // We only call this when the local queue is empty or under a | |
| 3576 // given target limit. So, we do not expect this push to fail. | |
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3577 assert(success, "invariant"); |
| 342 | 3578 } |
| 3579 | |
| 3580 statsOnly( int tmp_size = _task_queue->size(); | |
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3581 if (tmp_size > _local_max_size) { |
| 342 | 3582 _local_max_size = tmp_size; |
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3583 } |
| 342 | 3584 _local_pushes += n ); |
| 3585 } | |
| 3586 | |
| 3587 // this operation was quite expensive, so decrease the limits | |
| 3588 decrease_limits(); | |
| 3589 } | |
| 3590 | |
| 3591 void CMTask::drain_local_queue(bool partially) { | |
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3592 if (has_aborted()) return; |
| 342 | 3593 |
| 3594 // Decide what the target size is, depending whether we're going to | |
| 3595 // drain it partially (so that other tasks can steal if they run out | |
| 3596 // of things to do) or totally (at the very end). | |
| 3597 size_t target_size; | |
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3598 if (partially) { |
| 342 | 3599 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3600 } else { |
| 342 | 3601 target_size = 0; |
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3602 } |
| 342 | 3603 |
| 3604 if (_task_queue->size() > target_size) { | |
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3605 if (_cm->verbose_high()) { |
| 342 | 3606 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
| 3607 _task_id, target_size); | |
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3608 } |
| 342 | 3609 |
| 3610 oop obj; | |
| 3611 bool ret = _task_queue->pop_local(obj); | |
| 3612 while (ret) { | |
| 3613 statsOnly( ++_local_pops ); | |
| 3614 | |
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3615 if (_cm->verbose_high()) { |
| 342 | 3616 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
| 3617 (void*) obj); | |
|
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3618 } |
| 342 | 3619 |
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3620 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 3621 assert(!_g1h->is_on_master_free_list( |
| 2152 | 3622 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 3623 |
| 3624 scan_object(obj); | |
| 3625 | |
|
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3626 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 3627 ret = false; |
|
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3628 } else { |
| 342 | 3629 ret = _task_queue->pop_local(obj); |
|
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3630 } |
| 342 | 3631 } |
| 3632 | |
|
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3633 if (_cm->verbose_high()) { |
| 342 | 3634 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
| 3635 _task_id, _task_queue->size()); | |
|
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3636 } |
| 342 | 3637 } |
| 3638 } | |
| 3639 | |
| 3640 void CMTask::drain_global_stack(bool partially) { | |
|
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3641 if (has_aborted()) return; |
| 342 | 3642 |
| 3643 // We have a policy to drain the local queue before we attempt to | |
| 3644 // drain the global stack. | |
|
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3645 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 3646 |
| 3647 // Decide what the target size is, depending whether we're going to | |
| 3648 // drain it partially (so that other tasks can steal if they run out | |
| 3649 // of things to do) or totally (at the very end). Notice that, | |
| 3650 // because we move entries from the global stack in chunks or | |
| 3651 // because another task might be doing the same, we might in fact | |
| 3652 // drop below the target. But, this is not a problem. | |
| 3653 size_t target_size; | |
|
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3654 if (partially) { |
| 342 | 3655 target_size = _cm->partial_mark_stack_size_target(); |
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3656 } else { |
| 342 | 3657 target_size = 0; |
|
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3658 } |
| 342 | 3659 |
| 3660 if (_cm->mark_stack_size() > target_size) { | |
|
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3661 if (_cm->verbose_low()) { |
| 342 | 3662 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
| 3663 _task_id, target_size); | |
|
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3664 } |
| 342 | 3665 |
| 3666 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 3667 get_entries_from_global_stack(); | |
| 3668 drain_local_queue(partially); | |
| 3669 } | |
| 3670 | |
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3671 if (_cm->verbose_low()) { |
| 342 | 3672 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
| 3673 _task_id, _cm->mark_stack_size()); | |
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3674 } |
| 342 | 3675 } |
| 3676 } | |
| 3677 | |
| 3678 // SATB Queue has several assumptions on whether to call the par or | |
| 3679 // non-par versions of the methods. this is why some of the code is | |
| 3680 // replicated. We should really get rid of the single-threaded version | |
| 3681 // of the code to simplify things. | |
| 3682 void CMTask::drain_satb_buffers() { | |
|
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3683 if (has_aborted()) return; |
| 342 | 3684 |
| 3685 // We set this so that the regular clock knows that we're in the | |
| 3686 // middle of draining buffers and doesn't set the abort flag when it | |
| 3687 // notices that SATB buffers are available for draining. It'd be | |
| 3688 // very counter productive if it did that. :-) | |
| 3689 _draining_satb_buffers = true; | |
| 3690 | |
| 3691 CMObjectClosure oc(this); | |
| 3692 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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3693 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3694 satb_mq_set.set_par_closure(_task_id, &oc); |
|
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3695 } else { |
| 342 | 3696 satb_mq_set.set_closure(&oc); |
|
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3697 } |
| 342 | 3698 |
| 3699 // This keeps claiming and applying the closure to completed buffers | |
| 3700 // until we run out of buffers or we need to abort. | |
|
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3701 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3702 while (!has_aborted() && |
| 3703 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
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3704 if (_cm->verbose_medium()) { |
| 342 | 3705 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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3706 } |
| 342 | 3707 statsOnly( ++_satb_buffers_processed ); |
| 3708 regular_clock_call(); | |
| 3709 } | |
| 3710 } else { | |
| 3711 while (!has_aborted() && | |
| 3712 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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3713 if (_cm->verbose_medium()) { |
| 342 | 3714 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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3715 } |
| 342 | 3716 statsOnly( ++_satb_buffers_processed ); |
| 3717 regular_clock_call(); | |
| 3718 } | |
| 3719 } | |
| 3720 | |
| 3721 if (!concurrent() && !has_aborted()) { | |
| 3722 // We should only do this during remark. | |
|
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3723 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3724 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
|
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3725 } else { |
| 342 | 3726 satb_mq_set.iterate_closure_all_threads(); |
|
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3727 } |
| 342 | 3728 } |
| 3729 | |
| 3730 _draining_satb_buffers = false; | |
| 3731 | |
|
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3732 assert(has_aborted() || |
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3733 concurrent() || |
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3734 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 3735 |
|
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3736 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3737 satb_mq_set.set_par_closure(_task_id, NULL); |
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3738 } else { |
| 342 | 3739 satb_mq_set.set_closure(NULL); |
|
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3740 } |
| 342 | 3741 |
| 3742 // again, this was a potentially expensive operation, decrease the | |
| 3743 // limits to get the regular clock call early | |
| 3744 decrease_limits(); | |
| 3745 } | |
| 3746 | |
| 3747 void CMTask::print_stats() { | |
| 3748 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
| 3749 _task_id, _calls); | |
| 3750 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
| 3751 _elapsed_time_ms, _termination_time_ms); | |
| 3752 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 3753 _step_times_ms.num(), _step_times_ms.avg(), | |
| 3754 _step_times_ms.sd()); | |
| 3755 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 3756 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 3757 | |
| 3758 #if _MARKING_STATS_ | |
| 3759 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 3760 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 3761 _all_clock_intervals_ms.sd()); | |
| 3762 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 3763 _all_clock_intervals_ms.maximum(), | |
| 3764 _all_clock_intervals_ms.sum()); | |
| 3765 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 3766 _clock_due_to_scanning, _clock_due_to_marking); | |
| 3767 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 3768 _objs_scanned, _objs_found_on_bitmap); | |
| 3769 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 3770 _local_pushes, _local_pops, _local_max_size); | |
| 3771 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 3772 _global_pushes, _global_pops, _global_max_size); | |
| 3773 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 3774 _global_transfers_to,_global_transfers_from); | |
|
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3775 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
| 342 | 3776 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
| 3777 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 3778 _steal_attempts, _steals); | |
| 3779 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 3780 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 3781 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 3782 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 3783 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 3784 #endif // _MARKING_STATS_ | |
| 3785 } | |
| 3786 | |
| 3787 /***************************************************************************** | |
| 3788 | |
| 3789 The do_marking_step(time_target_ms) method is the building block | |
| 3790 of the parallel marking framework. It can be called in parallel | |
| 3791 with other invocations of do_marking_step() on different tasks | |
| 3792 (but only one per task, obviously) and concurrently with the | |
| 3793 mutator threads, or during remark, hence it eliminates the need | |
| 3794 for two versions of the code. When called during remark, it will | |
| 3795 pick up from where the task left off during the concurrent marking | |
| 3796 phase. Interestingly, tasks are also claimable during evacuation | |
| 3797 pauses too, since do_marking_step() ensures that it aborts before | |
| 3798 it needs to yield. | |
| 3799 | |
| 3800 The data structures that is uses to do marking work are the | |
| 3801 following: | |
| 3802 | |
| 3803 (1) Marking Bitmap. If there are gray objects that appear only | |
| 3804 on the bitmap (this happens either when dealing with an overflow | |
| 3805 or when the initial marking phase has simply marked the roots | |
| 3806 and didn't push them on the stack), then tasks claim heap | |
| 3807 regions whose bitmap they then scan to find gray objects. A | |
| 3808 global finger indicates where the end of the last claimed region | |
| 3809 is. A local finger indicates how far into the region a task has | |
| 3810 scanned. The two fingers are used to determine how to gray an | |
| 3811 object (i.e. whether simply marking it is OK, as it will be | |
| 3812 visited by a task in the future, or whether it needs to be also | |
| 3813 pushed on a stack). | |
| 3814 | |
| 3815 (2) Local Queue. The local queue of the task which is accessed | |
| 3816 reasonably efficiently by the task. Other tasks can steal from | |
| 3817 it when they run out of work. Throughout the marking phase, a | |
| 3818 task attempts to keep its local queue short but not totally | |
| 3819 empty, so that entries are available for stealing by other | |
| 3820 tasks. Only when there is no more work, a task will totally | |
| 3821 drain its local queue. | |
| 3822 | |
| 3823 (3) Global Mark Stack. This handles local queue overflow. During | |
| 3824 marking only sets of entries are moved between it and the local | |
| 3825 queues, as access to it requires a mutex and more fine-grain | |
| 3826 interaction with it which might cause contention. If it | |
| 3827 overflows, then the marking phase should restart and iterate | |
| 3828 over the bitmap to identify gray objects. Throughout the marking | |
| 3829 phase, tasks attempt to keep the global mark stack at a small | |
| 3830 length but not totally empty, so that entries are available for | |
| 3831 popping by other tasks. Only when there is no more work, tasks | |
| 3832 will totally drain the global mark stack. | |
| 3833 | |
|
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3834 (4) SATB Buffer Queue. This is where completed SATB buffers are |
| 342 | 3835 made available. Buffers are regularly removed from this queue |
| 3836 and scanned for roots, so that the queue doesn't get too | |
| 3837 long. During remark, all completed buffers are processed, as | |
| 3838 well as the filled in parts of any uncompleted buffers. | |
| 3839 | |
| 3840 The do_marking_step() method tries to abort when the time target | |
| 3841 has been reached. There are a few other cases when the | |
| 3842 do_marking_step() method also aborts: | |
| 3843 | |
| 3844 (1) When the marking phase has been aborted (after a Full GC). | |
| 3845 | |
|
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3846 (2) When a global overflow (on the global stack) has been |
|
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3847 triggered. Before the task aborts, it will actually sync up with |
|
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3848 the other tasks to ensure that all the marking data structures |
|
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3849 (local queues, stacks, fingers etc.) are re-initialised so that |
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3850 when do_marking_step() completes, the marking phase can |
|
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|
3851 immediately restart. |
| 342 | 3852 |
| 3853 (3) When enough completed SATB buffers are available. The | |
| 3854 do_marking_step() method only tries to drain SATB buffers right | |
| 3855 at the beginning. So, if enough buffers are available, the | |
| 3856 marking step aborts and the SATB buffers are processed at | |
| 3857 the beginning of the next invocation. | |
| 3858 | |
| 3859 (4) To yield. when we have to yield then we abort and yield | |
| 3860 right at the end of do_marking_step(). This saves us from a lot | |
| 3861 of hassle as, by yielding we might allow a Full GC. If this | |
| 3862 happens then objects will be compacted underneath our feet, the | |
| 3863 heap might shrink, etc. We save checking for this by just | |
| 3864 aborting and doing the yield right at the end. | |
| 3865 | |
| 3866 From the above it follows that the do_marking_step() method should | |
| 3867 be called in a loop (or, otherwise, regularly) until it completes. | |
| 3868 | |
| 3869 If a marking step completes without its has_aborted() flag being | |
| 3870 true, it means it has completed the current marking phase (and | |
| 3871 also all other marking tasks have done so and have all synced up). | |
| 3872 | |
| 3873 A method called regular_clock_call() is invoked "regularly" (in | |
| 3874 sub ms intervals) throughout marking. It is this clock method that | |
| 3875 checks all the abort conditions which were mentioned above and | |
| 3876 decides when the task should abort. A work-based scheme is used to | |
| 3877 trigger this clock method: when the number of object words the | |
| 3878 marking phase has scanned or the number of references the marking | |
| 3879 phase has visited reach a given limit. Additional invocations to | |
| 3880 the method clock have been planted in a few other strategic places | |
| 3881 too. The initial reason for the clock method was to avoid calling | |
| 3882 vtime too regularly, as it is quite expensive. So, once it was in | |
| 3883 place, it was natural to piggy-back all the other conditions on it | |
| 3884 too and not constantly check them throughout the code. | |
| 3885 | |
| 3886 *****************************************************************************/ | |
| 3887 | |
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3888 void CMTask::do_marking_step(double time_target_ms, |
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3889 bool do_stealing, |
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3890 bool do_termination) { |
|
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3891 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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3892 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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3893 |
| 342 | 3894 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
|
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3895 assert(_task_queues != NULL, "invariant"); |
|
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3896 assert(_task_queue != NULL, "invariant"); |
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3897 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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3898 |
|
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3899 assert(!_claimed, |
|
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3900 "only one thread should claim this task at any one time"); |
| 342 | 3901 |
| 3902 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 3903 // possible for two threads to set the _claimed flag at the same | |
| 3904 // time. But it is only for debugging purposes anyway and it will | |
| 3905 // catch most problems. | |
| 3906 _claimed = true; | |
| 3907 | |
| 3908 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 3909 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 3910 | |
| 3911 double diff_prediction_ms = | |
| 3912 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 3913 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 3914 | |
| 3915 // set up the variables that are used in the work-based scheme to | |
| 3916 // call the regular clock method | |
| 3917 _words_scanned = 0; | |
| 3918 _refs_reached = 0; | |
| 3919 recalculate_limits(); | |
| 3920 | |
| 3921 // clear all flags | |
| 3922 clear_has_aborted(); | |
|
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3923 _has_timed_out = false; |
| 342 | 3924 _draining_satb_buffers = false; |
| 3925 | |
| 3926 ++_calls; | |
| 3927 | |
|
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|
3928 if (_cm->verbose_low()) { |
| 342 | 3929 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
| 3930 "target = %1.2lfms >>>>>>>>>>", | |
| 3931 _task_id, _calls, _time_target_ms); | |
|
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|
3932 } |
| 342 | 3933 |
| 3934 // Set up the bitmap and oop closures. Anything that uses them is | |
| 3935 // eventually called from this method, so it is OK to allocate these | |
| 3936 // statically. | |
| 3937 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 3938 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 3939 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 3940 |
| 3941 if (_cm->has_overflown()) { | |
|
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3942 // This can happen if the mark stack overflows during a GC pause |
|
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3943 // and this task, after a yield point, restarts. We have to abort |
|
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3944 // as we need to get into the overflow protocol which happens |
|
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3945 // right at the end of this task. |
| 342 | 3946 set_has_aborted(); |
| 3947 } | |
| 3948 | |
| 3949 // First drain any available SATB buffers. After this, we will not | |
| 3950 // look at SATB buffers before the next invocation of this method. | |
| 3951 // If enough completed SATB buffers are queued up, the regular clock | |
| 3952 // will abort this task so that it restarts. | |
| 3953 drain_satb_buffers(); | |
| 3954 // ...then partially drain the local queue and the global stack | |
| 3955 drain_local_queue(true); | |
| 3956 drain_global_stack(true); | |
| 3957 | |
| 3958 do { | |
| 3959 if (!has_aborted() && _curr_region != NULL) { | |
| 3960 // This means that we're already holding on to a region. | |
|
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3961 assert(_finger != NULL, "if region is not NULL, then the finger " |
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|
3962 "should not be NULL either"); |
| 342 | 3963 |
| 3964 // We might have restarted this task after an evacuation pause | |
| 3965 // which might have evacuated the region we're holding on to | |
| 3966 // underneath our feet. Let's read its limit again to make sure | |
| 3967 // that we do not iterate over a region of the heap that | |
| 3968 // contains garbage (update_region_limit() will also move | |
| 3969 // _finger to the start of the region if it is found empty). | |
| 3970 update_region_limit(); | |
| 3971 // We will start from _finger not from the start of the region, | |
| 3972 // as we might be restarting this task after aborting half-way | |
| 3973 // through scanning this region. In this case, _finger points to | |
| 3974 // the address where we last found a marked object. If this is a | |
| 3975 // fresh region, _finger points to start(). | |
| 3976 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 3977 | |
|
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|
3978 if (_cm->verbose_low()) { |
| 342 | 3979 gclog_or_tty->print_cr("[%d] we're scanning part " |
| 3980 "["PTR_FORMAT", "PTR_FORMAT") " | |
| 3981 "of region "PTR_FORMAT, | |
| 3982 _task_id, _finger, _region_limit, _curr_region); | |
|
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3983 } |
| 342 | 3984 |
| 3985 // Let's iterate over the bitmap of the part of the | |
| 3986 // region that is left. | |
|
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|
3987 if (mr.is_empty() || _nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
| 342 | 3988 // We successfully completed iterating over the region. Now, |
| 3989 // let's give up the region. | |
| 3990 giveup_current_region(); | |
| 3991 regular_clock_call(); | |
| 3992 } else { | |
|
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3993 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 3994 // The only way to abort the bitmap iteration is to return |
| 3995 // false from the do_bit() method. However, inside the | |
| 3996 // do_bit() method we move the _finger to point to the | |
| 3997 // object currently being looked at. So, if we bail out, we | |
| 3998 // have definitely set _finger to something non-null. | |
|
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3999 assert(_finger != NULL, "invariant"); |
| 342 | 4000 |
| 4001 // Region iteration was actually aborted. So now _finger | |
| 4002 // points to the address of the object we last scanned. If we | |
| 4003 // leave it there, when we restart this task, we will rescan | |
| 4004 // the object. It is easy to avoid this. We move the finger by | |
| 4005 // enough to point to the next possible object header (the | |
| 4006 // bitmap knows by how much we need to move it as it knows its | |
| 4007 // granularity). | |
|
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4008 assert(_finger < _region_limit, "invariant"); |
|
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4009 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
|
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4010 // Check if bitmap iteration was aborted while scanning the last object |
|
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4011 if (new_finger >= _region_limit) { |
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4012 giveup_current_region(); |
|
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4013 } else { |
|
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|
4014 move_finger_to(new_finger); |
|
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|
4015 } |
| 342 | 4016 } |
| 4017 } | |
| 4018 // At this point we have either completed iterating over the | |
| 4019 // region we were holding on to, or we have aborted. | |
| 4020 | |
| 4021 // We then partially drain the local queue and the global stack. | |
| 4022 // (Do we really need this?) | |
| 4023 drain_local_queue(true); | |
| 4024 drain_global_stack(true); | |
| 4025 | |
| 4026 // Read the note on the claim_region() method on why it might | |
| 4027 // return NULL with potentially more regions available for | |
| 4028 // claiming and why we have to check out_of_regions() to determine | |
| 4029 // whether we're done or not. | |
| 4030 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 4031 // We are going to try to claim a new region. We should have | |
| 4032 // given up on the previous one. | |
|
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4033 // Separated the asserts so that we know which one fires. |
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|
4034 assert(_curr_region == NULL, "invariant"); |
|
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|
4035 assert(_finger == NULL, "invariant"); |
|
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|
4036 assert(_region_limit == NULL, "invariant"); |
|
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|
4037 if (_cm->verbose_low()) { |
| 342 | 4038 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
|
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|
4039 } |
| 342 | 4040 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
| 4041 if (claimed_region != NULL) { | |
| 4042 // Yes, we managed to claim one | |
| 4043 statsOnly( ++_regions_claimed ); | |
| 4044 | |
|
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|
4045 if (_cm->verbose_low()) { |
| 342 | 4046 gclog_or_tty->print_cr("[%d] we successfully claimed " |
| 4047 "region "PTR_FORMAT, | |
| 4048 _task_id, claimed_region); | |
|
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|
4049 } |
| 342 | 4050 |
| 4051 setup_for_region(claimed_region); | |
|
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4052 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 4053 } |
| 4054 // It is important to call the regular clock here. It might take | |
| 4055 // a while to claim a region if, for example, we hit a large | |
| 4056 // block of empty regions. So we need to call the regular clock | |
| 4057 // method once round the loop to make sure it's called | |
| 4058 // frequently enough. | |
| 4059 regular_clock_call(); | |
| 4060 } | |
| 4061 | |
| 4062 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
4063 assert(_cm->out_of_regions(), |
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|
4064 "at this point we should be out of regions"); |
| 342 | 4065 } |
| 4066 } while ( _curr_region != NULL && !has_aborted()); | |
| 4067 | |
| 4068 if (!has_aborted()) { | |
| 4069 // We cannot check whether the global stack is empty, since other | |
|
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|
4070 // tasks might be pushing objects to it concurrently. |
|
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|
4071 assert(_cm->out_of_regions(), |
|
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|
4072 "at this point we should be out of regions"); |
| 342 | 4073 |
|
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|
4074 if (_cm->verbose_low()) { |
| 342 | 4075 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
|
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|
4076 } |
| 342 | 4077 |
| 4078 // Try to reduce the number of available SATB buffers so that | |
| 4079 // remark has less work to do. | |
| 4080 drain_satb_buffers(); | |
| 4081 } | |
| 4082 | |
| 4083 // Since we've done everything else, we can now totally drain the | |
| 4084 // local queue and global stack. | |
| 4085 drain_local_queue(false); | |
| 4086 drain_global_stack(false); | |
| 4087 | |
| 4088 // Attempt at work stealing from other task's queues. | |
|
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|
4089 if (do_stealing && !has_aborted()) { |
| 342 | 4090 // We have not aborted. This means that we have finished all that |
| 4091 // we could. Let's try to do some stealing... | |
| 4092 | |
| 4093 // We cannot check whether the global stack is empty, since other | |
|
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|
4094 // tasks might be pushing objects to it concurrently. |
|
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|
4095 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
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|
4096 "only way to reach here"); |
| 342 | 4097 |
|
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|
4098 if (_cm->verbose_low()) { |
| 342 | 4099 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
|
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|
4100 } |
| 342 | 4101 |
| 4102 while (!has_aborted()) { | |
| 4103 oop obj; | |
| 4104 statsOnly( ++_steal_attempts ); | |
| 4105 | |
| 4106 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
|
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|
4107 if (_cm->verbose_medium()) { |
| 342 | 4108 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
| 4109 _task_id, (void*) obj); | |
|
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|
4110 } |
| 342 | 4111 |
| 4112 statsOnly( ++_steals ); | |
| 4113 | |
|
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|
4114 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
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|
4115 "any stolen object should be marked"); |
| 342 | 4116 scan_object(obj); |
| 4117 | |
| 4118 // And since we're towards the end, let's totally drain the | |
| 4119 // local queue and global stack. | |
| 4120 drain_local_queue(false); | |
| 4121 drain_global_stack(false); | |
| 4122 } else { | |
| 4123 break; | |
| 4124 } | |
| 4125 } | |
| 4126 } | |
| 4127 | |
|
3316
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|
4128 // If we are about to wrap up and go into termination, check if we |
|
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|
4129 // should raise the overflow flag. |
|
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|
4130 if (do_termination && !has_aborted()) { |
|
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|
4131 if (_cm->force_overflow()->should_force()) { |
|
cd8e33b2a8ad
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|
4132 _cm->set_has_overflown(); |
|
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|
4133 regular_clock_call(); |
|
cd8e33b2a8ad
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|
4134 } |
|
cd8e33b2a8ad
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|
4135 } |
|
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|
4136 |
| 342 | 4137 // We still haven't aborted. Now, let's try to get into the |
| 4138 // termination protocol. | |
|
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|
4139 if (do_termination && !has_aborted()) { |
| 342 | 4140 // We cannot check whether the global stack is empty, since other |
|
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|
4141 // tasks might be concurrently pushing objects on it. |
|
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|
4142 // Separated the asserts so that we know which one fires. |
|
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|
4143 assert(_cm->out_of_regions(), "only way to reach here"); |
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|
4144 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 4145 |
|
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|
4146 if (_cm->verbose_low()) { |
| 342 | 4147 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
|
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|
4148 } |
| 342 | 4149 |
| 4150 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4151 // The CMTask class also extends the TerminatorTerminator class, | |
| 4152 // hence its should_exit_termination() method will also decide | |
| 4153 // whether to exit the termination protocol or not. | |
| 4154 bool finished = _cm->terminator()->offer_termination(this); | |
| 4155 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
| 4156 _termination_time_ms += | |
| 4157 termination_end_time_ms - _termination_start_time_ms; | |
| 4158 | |
| 4159 if (finished) { | |
| 4160 // We're all done. | |
| 4161 | |
| 4162 if (_task_id == 0) { | |
| 4163 // let's allow task 0 to do this | |
| 4164 if (concurrent()) { | |
|
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|
4165 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 4166 // we need to set this to false before the next |
| 4167 // safepoint. This way we ensure that the marking phase | |
| 4168 // doesn't observe any more heap expansions. | |
| 4169 _cm->clear_concurrent_marking_in_progress(); | |
| 4170 } | |
| 4171 } | |
| 4172 | |
| 4173 // We can now guarantee that the global stack is empty, since | |
|
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|
4174 // all other tasks have finished. We separated the guarantees so |
|
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|
4175 // that, if a condition is false, we can immediately find out |
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|
4176 // which one. |
|
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|
4177 guarantee(_cm->out_of_regions(), "only way to reach here"); |
|
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|
4178 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
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|
4179 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
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|
4180 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
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|
4181 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
| 342 | 4182 |
|
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|
4183 if (_cm->verbose_low()) { |
| 342 | 4184 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
|
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|
4185 } |
| 342 | 4186 } else { |
| 4187 // Apparently there's more work to do. Let's abort this task. It | |
| 4188 // will restart it and we can hopefully find more things to do. | |
| 4189 | |
|
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|
4190 if (_cm->verbose_low()) { |
|
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|
4191 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
|
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|
4192 _task_id); |
|
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|
4193 } |
| 342 | 4194 |
| 4195 set_has_aborted(); | |
| 4196 statsOnly( ++_aborted_termination ); | |
| 4197 } | |
| 4198 } | |
| 4199 | |
| 4200 // Mainly for debugging purposes to make sure that a pointer to the | |
| 4201 // closure which was statically allocated in this frame doesn't | |
| 4202 // escape it by accident. | |
| 3771 | 4203 set_cm_oop_closure(NULL); |
| 342 | 4204 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 4205 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 4206 // Update the step history. | |
| 4207 _step_times_ms.add(elapsed_time_ms); | |
| 4208 | |
| 4209 if (has_aborted()) { | |
| 4210 // The task was aborted for some reason. | |
| 4211 | |
| 4212 statsOnly( ++_aborted ); | |
| 4213 | |
|
2174
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|
4214 if (_has_timed_out) { |
| 342 | 4215 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 4216 // Keep statistics of how well we did with respect to hitting | |
| 4217 // our target only if we actually timed out (if we aborted for | |
| 4218 // other reasons, then the results might get skewed). | |
| 4219 _marking_step_diffs_ms.add(diff_ms); | |
| 4220 } | |
| 4221 | |
| 4222 if (_cm->has_overflown()) { | |
| 4223 // This is the interesting one. We aborted because a global | |
| 4224 // overflow was raised. This means we have to restart the | |
| 4225 // marking phase and start iterating over regions. However, in | |
| 4226 // order to do this we have to make sure that all tasks stop | |
| 4227 // what they are doing and re-initialise in a safe manner. We | |
| 4228 // will achieve this with the use of two barrier sync points. | |
| 4229 | |
|
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|
4230 if (_cm->verbose_low()) { |
| 342 | 4231 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
|
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|
4232 } |
| 342 | 4233 |
| 4234 _cm->enter_first_sync_barrier(_task_id); | |
| 4235 // When we exit this sync barrier we know that all tasks have | |
| 4236 // stopped doing marking work. So, it's now safe to | |
| 4237 // re-initialise our data structures. At the end of this method, | |
| 4238 // task 0 will clear the global data structures. | |
| 4239 | |
| 4240 statsOnly( ++_aborted_overflow ); | |
| 4241 | |
| 4242 // We clear the local state of this task... | |
| 4243 clear_region_fields(); | |
| 4244 | |
| 4245 // ...and enter the second barrier. | |
| 4246 _cm->enter_second_sync_barrier(_task_id); | |
| 4247 // At this point everything has bee re-initialised and we're | |
| 4248 // ready to restart. | |
| 4249 } | |
| 4250 | |
| 4251 if (_cm->verbose_low()) { | |
| 4252 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
| 4253 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4254 _task_id, _time_target_ms, elapsed_time_ms); | |
|
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|
4255 if (_cm->has_aborted()) { |
| 342 | 4256 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
| 4257 _task_id); | |
|
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|
4258 } |
| 342 | 4259 } |
| 4260 } else { | |
|
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|
4261 if (_cm->verbose_low()) { |
| 342 | 4262 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 4263 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4264 _task_id, _time_target_ms, elapsed_time_ms); | |
|
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|
4265 } |
| 342 | 4266 } |
| 4267 | |
| 4268 _claimed = false; | |
| 4269 } | |
| 4270 | |
| 4271 CMTask::CMTask(int task_id, | |
| 4272 ConcurrentMark* cm, | |
|
4836
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|
4273 size_t* marked_bytes, |
|
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|
4274 BitMap* card_bm, |
| 342 | 4275 CMTaskQueue* task_queue, |
| 4276 CMTaskQueueSet* task_queues) | |
| 4277 : _g1h(G1CollectedHeap::heap()), | |
| 4278 _task_id(task_id), _cm(cm), | |
| 4279 _claimed(false), | |
| 4280 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 4281 _task_queue(task_queue), | |
| 4282 _task_queues(task_queues), | |
| 3771 | 4283 _cm_oop_closure(NULL), |
|
4836
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|
4284 _marked_bytes_array(marked_bytes), |
|
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|
4285 _card_bm(card_bm) { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
4286 guarantee(task_queue != NULL, "invariant"); |
|
11d4857fe5e1
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diff
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|
4287 guarantee(task_queues != NULL, "invariant"); |
| 342 | 4288 |
| 4289 statsOnly( _clock_due_to_scanning = 0; | |
| 4290 _clock_due_to_marking = 0 ); | |
| 4291 | |
| 4292 _marking_step_diffs_ms.add(0.5); | |
| 4293 } | |
|
2435
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|
4294 |
|
371bbc844bf1
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|
4295 // These are formatting macros that are used below to ensure |
|
371bbc844bf1
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|
4296 // consistent formatting. The *_H_* versions are used to format the |
|
371bbc844bf1
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|
4297 // header for a particular value and they should be kept consistent |
|
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|
4298 // with the corresponding macro. Also note that most of the macros add |
|
371bbc844bf1
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|
4299 // 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
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|
4300 // easier to compose. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4301 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4302 // 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
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|
4303 // identify them easily in a large log file. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4304 #define G1PPRL_LINE_PREFIX "###" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4305 |
|
371bbc844bf1
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|
4306 #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
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|
4307 #ifdef _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4308 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4309 #else // _LP64 |
|
371bbc844bf1
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|
4310 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4311 #endif // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4312 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4313 // For per-region info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4314 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4315 #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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|
4316 #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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|
4317 #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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|
4318 #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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|
4319 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4320 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4321 // For summary info |
|
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
|
4322 #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
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changeset
|
4323 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
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|
4324 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4325 #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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changeset
|
4326 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4327 G1PrintRegionLivenessInfoClosure:: |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4328 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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|
4329 : _out(out), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4330 _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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|
4331 _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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|
4332 _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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|
4333 _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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|
4334 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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|
4335 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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|
4336 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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|
4337 double now = os::elapsedTime(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4338 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4339 // Print the header of the output. |
|
371bbc844bf1
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|
4340 _out->cr(); |
|
371bbc844bf1
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|
4341 _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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|
4342 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
|
371bbc844bf1
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|
4343 G1PPRL_SUM_ADDR_FORMAT("committed") |
|
371bbc844bf1
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|
4344 G1PPRL_SUM_ADDR_FORMAT("reserved") |
|
371bbc844bf1
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|
4345 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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|
4346 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
|
4347 g1_reserved.start(), g1_reserved.end(), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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3979
diff
changeset
|
4348 HeapRegion::GrainBytes); |
|
2435
371bbc844bf1
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|
4349 _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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|
4350 _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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|
4351 G1PPRL_TYPE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4352 G1PPRL_ADDR_BASE_H_FORMAT |
|
371bbc844bf1
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|
4353 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4354 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4355 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4356 G1PPRL_DOUBLE_H_FORMAT, |
|
371bbc844bf1
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|
4357 "type", "address-range", |
|
371bbc844bf1
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|
4358 "used", "prev-live", "next-live", "gc-eff"); |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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changeset
|
4359 _out->print_cr(G1PPRL_LINE_PREFIX |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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changeset
|
4360 G1PPRL_TYPE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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changeset
|
4361 G1PPRL_ADDR_BASE_H_FORMAT |
|
5cc33133bc6d
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3975
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|
4362 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
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3975
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changeset
|
4363 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4364 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4365 G1PPRL_DOUBLE_H_FORMAT, |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4366 "", "", |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4367 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4368 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4369 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4370 // It takes as a parameter a reference to one of the _hum_* fields, it |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4371 // 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
|
4372 // series (either the region size, or what's left if the _hum_* field |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4373 // 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
|
4374 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4375 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
|
4376 // The > 0 check is to deal with the prev and next live bytes which |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4377 // 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
|
4378 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4379 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
|
4380 *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
|
4381 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4382 return bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4383 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4384 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4385 // It deduces the values for a region in a humongous region series |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4386 // from the _hum_* fields and updates those accordingly. It assumes |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4387 // that that _hum_* fields have already been set up from the "starts |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4388 // humongous" region and we visit the regions in address order. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4389 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4390 size_t* capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4391 size_t* prev_live_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4392 size_t* next_live_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4393 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4394 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4395 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4396 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4397 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4398 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4399 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4400 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4401 const char* type = ""; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4402 HeapWord* bottom = r->bottom(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4403 HeapWord* end = r->end(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4404 size_t capacity_bytes = r->capacity(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4405 size_t used_bytes = r->used(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4406 size_t prev_live_bytes = r->live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4407 size_t next_live_bytes = r->next_live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4408 double gc_eff = r->gc_efficiency(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4409 if (r->used() == 0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4410 type = "FREE"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4411 } 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
|
4412 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4413 } else if (r->is_young()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4414 type = "EDEN"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4415 } else if (r->startsHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4416 type = "HUMS"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4417 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4418 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4419 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4420 "they should have been zeroed after the last time we used them"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4421 // Set up the _hum_* fields. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4422 _hum_capacity_bytes = capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4423 _hum_used_bytes = used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4424 _hum_prev_live_bytes = prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4425 _hum_next_live_bytes = next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4426 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4427 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4428 end = bottom + HeapRegion::GrainWords; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4429 } else if (r->continuesHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4430 type = "HUMC"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4431 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4432 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4433 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4434 } else { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4435 type = "OLD"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4436 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4437 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4438 _total_used_bytes += used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4439 _total_capacity_bytes += capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4440 _total_prev_live_bytes += prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4441 _total_next_live_bytes += next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4442 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4443 // Print a line for this particular region. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4444 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4445 G1PPRL_TYPE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4446 G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4447 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4448 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4449 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4450 G1PPRL_DOUBLE_FORMAT, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4451 type, bottom, end, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4452 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4453 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4454 return false; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4455 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4456 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4457 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4458 // Print the footer of the output. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4459 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4460 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4461 " SUMMARY" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4462 G1PPRL_SUM_MB_FORMAT("capacity") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4463 G1PPRL_SUM_MB_PERC_FORMAT("used") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4464 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4465 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4466 bytes_to_mb(_total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4467 bytes_to_mb(_total_used_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4468 perc(_total_used_bytes, _total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4469 bytes_to_mb(_total_prev_live_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4470 perc(_total_prev_live_bytes, _total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4471 bytes_to_mb(_total_next_live_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4472 perc(_total_next_live_bytes, _total_capacity_bytes)); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4473 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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4474 } |