Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 6865:4202510ee0fe
8000831: Heap verification output incorrect/incomplete
Summary: Restore non-silent output of heap verification.
Reviewed-by: ysr, brutisso, jmasa
| author | johnc |
|---|---|
| date | Mon, 15 Oct 2012 10:02:42 -0700 |
| parents | 8a5ea0a9ccc4 |
| children | 442f942757c0 |
| 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" | |
| 6197 | 45 #include "services/memTracker.hpp" |
| 342 | 46 |
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47 // Concurrent marking bit map wrapper |
| 342 | 48 |
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49 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
| 342 | 50 _bm((uintptr_t*)NULL,0), |
| 51 _shifter(shifter) { | |
| 52 _bmStartWord = (HeapWord*)(rs.base()); | |
| 53 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
| 54 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
| 55 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
| 56 | |
| 6197 | 57 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
| 58 | |
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59 guarantee(brs.is_reserved(), "couldn't allocate concurrent marking bit map"); |
| 342 | 60 // For now we'll just commit all of the bit map up fromt. |
| 61 // Later on we'll try to be more parsimonious with swap. | |
| 62 guarantee(_virtual_space.initialize(brs, brs.size()), | |
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63 "couldn't reseve backing store for concurrent marking bit map"); |
| 342 | 64 assert(_virtual_space.committed_size() == brs.size(), |
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65 "didn't reserve backing store for all of concurrent marking bit map?"); |
| 342 | 66 _bm.set_map((uintptr_t*)_virtual_space.low()); |
| 67 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
| 68 _bmWordSize, "inconsistency in bit map sizing"); | |
| 69 _bm.set_size(_bmWordSize >> _shifter); | |
| 70 } | |
| 71 | |
| 72 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
| 73 HeapWord* limit) const { | |
| 74 // First we must round addr *up* to a possible object boundary. | |
| 75 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
| 76 HeapWordSize << _shifter); | |
| 77 size_t addrOffset = heapWordToOffset(addr); | |
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78 if (limit == NULL) { |
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79 limit = _bmStartWord + _bmWordSize; |
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80 } |
| 342 | 81 size_t limitOffset = heapWordToOffset(limit); |
| 82 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
| 83 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 84 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 85 assert(nextAddr == limit || isMarked(nextAddr), | |
| 86 "get_next_one postcondition"); | |
| 87 return nextAddr; | |
| 88 } | |
| 89 | |
| 90 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
| 91 HeapWord* limit) const { | |
| 92 size_t addrOffset = heapWordToOffset(addr); | |
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93 if (limit == NULL) { |
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94 limit = _bmStartWord + _bmWordSize; |
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95 } |
| 342 | 96 size_t limitOffset = heapWordToOffset(limit); |
| 97 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
| 98 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 99 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 100 assert(nextAddr == limit || !isMarked(nextAddr), | |
| 101 "get_next_one postcondition"); | |
| 102 return nextAddr; | |
| 103 } | |
| 104 | |
| 105 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
| 106 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
| 107 return (int) (diff >> _shifter); | |
| 108 } | |
| 109 | |
| 110 #ifndef PRODUCT | |
| 111 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
| 112 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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113 assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
| 342 | 114 "size inconsistency"); |
| 115 return _bmStartWord == (HeapWord*)(rs.base()) && | |
| 116 _bmWordSize == rs.size()>>LogHeapWordSize; | |
| 117 } | |
| 118 #endif | |
| 119 | |
| 120 void CMBitMap::clearAll() { | |
| 121 _bm.clear(); | |
| 122 return; | |
| 123 } | |
| 124 | |
| 125 void CMBitMap::markRange(MemRegion mr) { | |
| 126 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 127 assert(!mr.is_empty(), "unexpected empty region"); | |
| 128 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 129 ((HeapWord *) mr.end())), | |
| 130 "markRange memory region end is not card aligned"); | |
| 131 // convert address range into offset range | |
| 132 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 133 heapWordToOffset(mr.end()), true); | |
| 134 } | |
| 135 | |
| 136 void CMBitMap::clearRange(MemRegion mr) { | |
| 137 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 138 assert(!mr.is_empty(), "unexpected empty region"); | |
| 139 // convert address range into offset range | |
| 140 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 141 heapWordToOffset(mr.end()), false); | |
| 142 } | |
| 143 | |
| 144 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 145 HeapWord* end_addr) { | |
| 146 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 147 start = MIN2(start, end_addr); | |
| 148 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 149 end = MIN2(end, end_addr); | |
| 150 assert(start <= end, "Consistency check"); | |
| 151 MemRegion mr(start, end); | |
| 152 if (!mr.is_empty()) { | |
| 153 clearRange(mr); | |
| 154 } | |
| 155 return mr; | |
| 156 } | |
| 157 | |
| 158 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 159 _base(NULL), _cm(cm) | |
| 160 #ifdef ASSERT | |
| 161 , _drain_in_progress(false) | |
| 162 , _drain_in_progress_yields(false) | |
| 163 #endif | |
| 164 {} | |
| 165 | |
| 166 void CMMarkStack::allocate(size_t size) { | |
| 6197 | 167 _base = NEW_C_HEAP_ARRAY(oop, size, mtGC); |
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168 if (_base == NULL) { |
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169 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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170 } |
| 342 | 171 _index = 0; |
| 172 _capacity = (jint) size; | |
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173 _saved_index = -1; |
| 342 | 174 NOT_PRODUCT(_max_depth = 0); |
| 175 } | |
| 176 | |
| 177 CMMarkStack::~CMMarkStack() { | |
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178 if (_base != NULL) { |
| 6197 | 179 FREE_C_HEAP_ARRAY(oop, _base, mtGC); |
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180 } |
| 342 | 181 } |
| 182 | |
| 183 void CMMarkStack::par_push(oop ptr) { | |
| 184 while (true) { | |
| 185 if (isFull()) { | |
| 186 _overflow = true; | |
| 187 return; | |
| 188 } | |
| 189 // Otherwise... | |
| 190 jint index = _index; | |
| 191 jint next_index = index+1; | |
| 192 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 193 if (res == index) { | |
| 194 _base[index] = ptr; | |
| 195 // Note that we don't maintain this atomically. We could, but it | |
| 196 // doesn't seem necessary. | |
| 197 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 198 return; | |
| 199 } | |
| 200 // Otherwise, we need to try again. | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 205 while (true) { | |
| 206 if (isFull()) { | |
| 207 _overflow = true; | |
| 208 return; | |
| 209 } | |
| 210 // Otherwise... | |
| 211 jint index = _index; | |
| 212 jint next_index = index + n; | |
| 213 if (next_index > _capacity) { | |
| 214 _overflow = true; | |
| 215 return; | |
| 216 } | |
| 217 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 218 if (res == index) { | |
| 219 for (int i = 0; i < n; i++) { | |
| 220 int ind = index + i; | |
| 221 assert(ind < _capacity, "By overflow test above."); | |
| 222 _base[ind] = ptr_arr[i]; | |
| 223 } | |
| 224 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 225 return; | |
| 226 } | |
| 227 // Otherwise, we need to try again. | |
| 228 } | |
| 229 } | |
| 230 | |
| 231 | |
| 232 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 233 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 234 jint start = _index; | |
| 235 jint next_index = start + n; | |
| 236 if (next_index > _capacity) { | |
| 237 _overflow = true; | |
| 238 return; | |
| 239 } | |
| 240 // Otherwise. | |
| 241 _index = next_index; | |
| 242 for (int i = 0; i < n; i++) { | |
| 243 int ind = start + i; | |
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244 assert(ind < _capacity, "By overflow test above."); |
| 342 | 245 _base[ind] = ptr_arr[i]; |
| 246 } | |
| 247 } | |
| 248 | |
| 249 | |
| 250 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 251 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 252 jint index = _index; | |
| 253 if (index == 0) { | |
| 254 *n = 0; | |
| 255 return false; | |
| 256 } else { | |
| 257 int k = MIN2(max, index); | |
| 258 jint new_ind = index - k; | |
| 259 for (int j = 0; j < k; j++) { | |
| 260 ptr_arr[j] = _base[new_ind + j]; | |
| 261 } | |
| 262 _index = new_ind; | |
| 263 *n = k; | |
| 264 return true; | |
| 265 } | |
| 266 } | |
| 267 | |
| 268 template<class OopClosureClass> | |
| 269 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 270 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 271 || SafepointSynchronize::is_at_safepoint(), | |
| 272 "Drain recursion must be yield-safe."); | |
| 273 bool res = true; | |
| 274 debug_only(_drain_in_progress = true); | |
| 275 debug_only(_drain_in_progress_yields = yield_after); | |
| 276 while (!isEmpty()) { | |
| 277 oop newOop = pop(); | |
| 278 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 279 assert(newOop->is_oop(), "Expected an oop"); | |
| 280 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 281 "only grey objects on this stack"); | |
| 282 newOop->oop_iterate(cl); | |
| 283 if (yield_after && _cm->do_yield_check()) { | |
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284 res = false; |
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285 break; |
| 342 | 286 } |
| 287 } | |
| 288 debug_only(_drain_in_progress = false); | |
| 289 return res; | |
| 290 } | |
| 291 | |
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292 void CMMarkStack::note_start_of_gc() { |
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293 assert(_saved_index == -1, |
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294 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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295 _saved_index = _index; |
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296 } |
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297 |
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298 void CMMarkStack::note_end_of_gc() { |
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299 // This is intentionally a guarantee, instead of an assert. If we |
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300 // accidentally add something to the mark stack during GC, it |
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301 // will be a correctness issue so it's better if we crash. we'll |
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302 // only check this once per GC anyway, so it won't be a performance |
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303 // issue in any way. |
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304 guarantee(_saved_index == _index, |
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305 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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306 _saved_index = -1; |
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307 } |
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308 |
| 342 | 309 void CMMarkStack::oops_do(OopClosure* f) { |
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310 assert(_saved_index == _index, |
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311 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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312 for (int i = 0; i < _index; i += 1) { |
| 342 | 313 f->do_oop(&_base[i]); |
| 314 } | |
| 315 } | |
| 316 | |
| 317 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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318 return _g1h->is_obj_ill(obj); |
| 342 | 319 } |
| 320 | |
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321 CMRootRegions::CMRootRegions() : |
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322 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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323 _should_abort(false), _next_survivor(NULL) { } |
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324 |
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325 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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326 _young_list = g1h->young_list(); |
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327 _cm = cm; |
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328 } |
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329 |
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330 void CMRootRegions::prepare_for_scan() { |
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331 assert(!scan_in_progress(), "pre-condition"); |
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332 |
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333 // Currently, only survivors can be root regions. |
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334 assert(_next_survivor == NULL, "pre-condition"); |
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335 _next_survivor = _young_list->first_survivor_region(); |
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336 _scan_in_progress = (_next_survivor != NULL); |
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337 _should_abort = false; |
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338 } |
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339 |
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340 HeapRegion* CMRootRegions::claim_next() { |
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341 if (_should_abort) { |
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342 // If someone has set the should_abort flag, we return NULL to |
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343 // force the caller to bail out of their loop. |
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344 return NULL; |
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345 } |
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346 |
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347 // Currently, only survivors can be root regions. |
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348 HeapRegion* res = _next_survivor; |
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349 if (res != NULL) { |
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350 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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351 // Read it again in case it changed while we were waiting for the lock. |
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352 res = _next_survivor; |
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353 if (res != NULL) { |
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354 if (res == _young_list->last_survivor_region()) { |
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355 // We just claimed the last survivor so store NULL to indicate |
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356 // that we're done. |
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357 _next_survivor = NULL; |
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358 } else { |
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359 _next_survivor = res->get_next_young_region(); |
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360 } |
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361 } else { |
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362 // Someone else claimed the last survivor while we were trying |
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363 // to take the lock so nothing else to do. |
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364 } |
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365 } |
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366 assert(res == NULL || res->is_survivor(), "post-condition"); |
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367 |
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368 return res; |
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369 } |
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370 |
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371 void CMRootRegions::scan_finished() { |
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372 assert(scan_in_progress(), "pre-condition"); |
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373 |
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374 // Currently, only survivors can be root regions. |
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375 if (!_should_abort) { |
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376 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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377 } |
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378 _next_survivor = NULL; |
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379 |
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380 { |
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381 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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382 _scan_in_progress = false; |
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383 RootRegionScan_lock->notify_all(); |
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384 } |
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385 } |
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386 |
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387 bool CMRootRegions::wait_until_scan_finished() { |
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388 if (!scan_in_progress()) return false; |
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389 |
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390 { |
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391 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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392 while (scan_in_progress()) { |
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393 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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394 } |
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395 } |
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396 return true; |
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397 } |
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398 |
| 342 | 399 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 400 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 401 #endif // _MSC_VER | |
| 402 | |
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403 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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404 return MAX2((n_par_threads + 2) / 4, 1U); |
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405 } |
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406 |
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407 ConcurrentMark::ConcurrentMark(ReservedSpace rs, uint max_regions) : |
| 342 | 408 _markBitMap1(rs, MinObjAlignment - 1), |
| 409 _markBitMap2(rs, MinObjAlignment - 1), | |
| 410 | |
| 411 _parallel_marking_threads(0), | |
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412 _max_parallel_marking_threads(0), |
| 342 | 413 _sleep_factor(0.0), |
| 414 _marking_task_overhead(1.0), | |
| 415 _cleanup_sleep_factor(0.0), | |
| 416 _cleanup_task_overhead(1.0), | |
| 2152 | 417 _cleanup_list("Cleanup List"), |
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418 _region_bm((BitMap::idx_t) max_regions, false /* in_resource_area*/), |
| 342 | 419 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> |
| 420 CardTableModRefBS::card_shift, | |
| 421 false /* in_resource_area*/), | |
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422 |
| 342 | 423 _prevMarkBitMap(&_markBitMap1), |
| 424 _nextMarkBitMap(&_markBitMap2), | |
| 425 | |
| 426 _markStack(this), | |
| 427 // _finger set in set_non_marking_state | |
| 428 | |
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429 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 430 // _active_tasks set in set_non_marking_state |
| 431 // _tasks set inside the constructor | |
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432 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
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433 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
| 342 | 434 |
| 435 _has_overflown(false), | |
| 436 _concurrent(false), | |
|
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437 _has_aborted(false), |
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438 _restart_for_overflow(false), |
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439 _concurrent_marking_in_progress(false), |
| 342 | 440 |
| 441 // _verbose_level set below | |
| 442 | |
| 443 _init_times(), | |
| 444 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 445 _cleanup_times(), | |
| 446 _total_counting_time(0.0), | |
| 447 _total_rs_scrub_time(0.0), | |
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448 |
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449 _parallel_workers(NULL), |
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450 |
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451 _count_card_bitmaps(NULL), |
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452 _count_marked_bytes(NULL) { |
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453 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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454 if (verbose_level < no_verbose) { |
| 342 | 455 verbose_level = no_verbose; |
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456 } |
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457 if (verbose_level > high_verbose) { |
| 342 | 458 verbose_level = high_verbose; |
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459 } |
| 342 | 460 _verbose_level = verbose_level; |
| 461 | |
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462 if (verbose_low()) { |
| 342 | 463 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
| 464 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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465 } |
| 342 | 466 |
| 1284 | 467 _markStack.allocate(MarkStackSize); |
| 342 | 468 |
| 469 // Create & start a ConcurrentMark thread. | |
|
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470 _cmThread = new ConcurrentMarkThread(this); |
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471 assert(cmThread() != NULL, "CM Thread should have been created"); |
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472 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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473 |
| 342 | 474 _g1h = G1CollectedHeap::heap(); |
| 475 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
| 476 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
| 477 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
| 478 | |
| 479 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 480 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 481 |
|
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482 _root_regions.init(_g1h, this); |
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483 |
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484 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
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485 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
|
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486 |
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487 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
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488 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
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489 |
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490 BitMap::idx_t card_bm_size = _card_bm.size(); |
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491 |
| 342 | 492 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
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493 _active_tasks = _max_worker_id; |
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494 for (uint i = 0; i < _max_worker_id; ++i) { |
| 342 | 495 CMTaskQueue* task_queue = new CMTaskQueue(); |
| 496 task_queue->initialize(); | |
| 497 _task_queues->register_queue(i, task_queue); | |
| 498 | |
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499 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
| 6197 | 500 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, (size_t) max_regions, mtGC); |
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501 |
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502 _tasks[i] = new CMTask(i, this, |
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503 _count_marked_bytes[i], |
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504 &_count_card_bitmaps[i], |
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505 task_queue, _task_queues); |
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506 |
| 342 | 507 _accum_task_vtime[i] = 0.0; |
| 508 } | |
| 509 | |
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510 // Calculate the card number for the bottom of the heap. Used |
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511 // in biasing indexes into the accounting card bitmaps. |
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512 _heap_bottom_card_num = |
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513 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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514 CardTableModRefBS::card_shift); |
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515 |
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516 // Clear all the liveness counting data |
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517 clear_all_count_data(); |
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518 |
| 1284 | 519 if (ConcGCThreads > ParallelGCThreads) { |
| 520 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
| 342 | 521 "than ParallelGCThreads."); |
| 522 } | |
| 523 if (ParallelGCThreads == 0) { | |
| 524 // if we are not running with any parallel GC threads we will not | |
| 525 // spawn any marking threads either | |
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526 _parallel_marking_threads = 0; |
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527 _max_parallel_marking_threads = 0; |
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528 _sleep_factor = 0.0; |
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529 _marking_task_overhead = 1.0; |
| 342 | 530 } else { |
| 1284 | 531 if (ConcGCThreads > 0) { |
| 532 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
| 342 | 533 // if both are set |
| 534 | |
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535 _parallel_marking_threads = (uint) ConcGCThreads; |
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536 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 537 _sleep_factor = 0.0; |
| 538 _marking_task_overhead = 1.0; | |
| 751 | 539 } else if (G1MarkingOverheadPercent > 0) { |
| 342 | 540 // we will calculate the number of parallel marking threads |
| 541 // based on a target overhead with respect to the soft real-time | |
| 542 // goal | |
| 543 | |
| 751 | 544 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 545 double overall_cm_overhead = |
| 751 | 546 (double) MaxGCPauseMillis * marking_overhead / |
| 547 (double) GCPauseIntervalMillis; | |
| 342 | 548 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 549 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 550 double marking_task_overhead = | |
| 551 overall_cm_overhead / marking_thread_num * | |
| 552 (double) os::processor_count(); | |
| 553 double sleep_factor = | |
| 554 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 555 | |
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556 _parallel_marking_threads = (uint) marking_thread_num; |
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557 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 558 _sleep_factor = sleep_factor; |
| 559 _marking_task_overhead = marking_task_overhead; | |
| 560 } else { | |
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561 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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562 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 563 _sleep_factor = 0.0; |
| 564 _marking_task_overhead = 1.0; | |
| 565 } | |
| 566 | |
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567 if (parallel_marking_threads() > 1) { |
| 342 | 568 _cleanup_task_overhead = 1.0; |
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569 } else { |
| 342 | 570 _cleanup_task_overhead = marking_task_overhead(); |
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571 } |
| 342 | 572 _cleanup_sleep_factor = |
| 573 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 574 | |
| 575 #if 0 | |
| 576 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 577 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 578 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 579 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 580 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 581 #endif | |
| 582 | |
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583 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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584 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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585 _max_parallel_marking_threads, false, true); |
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586 if (_parallel_workers == NULL) { |
| 342 | 587 vm_exit_during_initialization("Failed necessary allocation."); |
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588 } else { |
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589 _parallel_workers->initialize_workers(); |
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590 } |
| 342 | 591 } |
| 592 | |
| 593 // so that the call below can read a sensible value | |
| 594 _heap_start = (HeapWord*) rs.base(); | |
| 595 set_non_marking_state(); | |
| 596 } | |
| 597 | |
| 598 void ConcurrentMark::update_g1_committed(bool force) { | |
| 599 // If concurrent marking is not in progress, then we do not need to | |
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600 // update _heap_end. |
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601 if (!concurrent_marking_in_progress() && !force) return; |
| 342 | 602 |
| 603 MemRegion committed = _g1h->g1_committed(); | |
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604 assert(committed.start() == _heap_start, "start shouldn't change"); |
| 342 | 605 HeapWord* new_end = committed.end(); |
| 606 if (new_end > _heap_end) { | |
| 607 // The heap has been expanded. | |
| 608 | |
| 609 _heap_end = new_end; | |
| 610 } | |
| 611 // Notice that the heap can also shrink. However, this only happens | |
| 612 // during a Full GC (at least currently) and the entire marking | |
| 613 // phase will bail out and the task will not be restarted. So, let's | |
| 614 // do nothing. | |
| 615 } | |
| 616 | |
| 617 void ConcurrentMark::reset() { | |
| 618 // Starting values for these two. This should be called in a STW | |
| 619 // phase. CM will be notified of any future g1_committed expansions | |
| 620 // will be at the end of evacuation pauses, when tasks are | |
| 621 // inactive. | |
| 622 MemRegion committed = _g1h->g1_committed(); | |
| 623 _heap_start = committed.start(); | |
| 624 _heap_end = committed.end(); | |
| 625 | |
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626 // Separated the asserts so that we know which one fires. |
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627 assert(_heap_start != NULL, "heap bounds should look ok"); |
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628 assert(_heap_end != NULL, "heap bounds should look ok"); |
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629 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 630 |
| 631 // reset all the marking data structures and any necessary flags | |
| 632 clear_marking_state(); | |
| 633 | |
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634 if (verbose_low()) { |
| 342 | 635 gclog_or_tty->print_cr("[global] resetting"); |
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636 } |
| 342 | 637 |
| 638 // We do reset all of them, since different phases will use | |
| 639 // different number of active threads. So, it's easiest to have all | |
| 640 // of them ready. | |
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641 for (uint i = 0; i < _max_worker_id; ++i) { |
| 342 | 642 _tasks[i]->reset(_nextMarkBitMap); |
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643 } |
| 342 | 644 |
| 645 // we need this to make sure that the flag is on during the evac | |
| 646 // pause with initial mark piggy-backed | |
| 647 set_concurrent_marking_in_progress(); | |
| 648 } | |
| 649 | |
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650 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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651 assert(active_tasks <= _max_worker_id, "we should not have more"); |
| 342 | 652 |
| 653 _active_tasks = active_tasks; | |
| 654 // Need to update the three data structures below according to the | |
| 655 // number of active threads for this phase. | |
| 656 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 657 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 658 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 659 | |
| 660 _concurrent = concurrent; | |
| 661 // We propagate this to all tasks, not just the active ones. | |
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662 for (uint i = 0; i < _max_worker_id; ++i) |
| 342 | 663 _tasks[i]->set_concurrent(concurrent); |
| 664 | |
| 665 if (concurrent) { | |
| 666 set_concurrent_marking_in_progress(); | |
| 667 } else { | |
| 668 // We currently assume that the concurrent flag has been set to | |
| 669 // false before we start remark. At this point we should also be | |
| 670 // in a STW phase. | |
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671 assert(!concurrent_marking_in_progress(), "invariant"); |
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672 assert(_finger == _heap_end, "only way to get here"); |
| 342 | 673 update_g1_committed(true); |
| 674 } | |
| 675 } | |
| 676 | |
| 677 void ConcurrentMark::set_non_marking_state() { | |
| 678 // We set the global marking state to some default values when we're | |
| 679 // not doing marking. | |
| 680 clear_marking_state(); | |
| 681 _active_tasks = 0; | |
| 682 clear_concurrent_marking_in_progress(); | |
| 683 } | |
| 684 | |
| 685 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 686 // The ConcurrentMark instance is never freed. |
| 687 ShouldNotReachHere(); | |
| 342 | 688 } |
| 689 | |
| 690 void ConcurrentMark::clearNextBitmap() { | |
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691 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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692 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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693 |
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694 // Make sure that the concurrent mark thread looks to still be in |
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695 // the current cycle. |
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696 guarantee(cmThread()->during_cycle(), "invariant"); |
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697 |
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698 // We are finishing up the current cycle by clearing the next |
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699 // marking bitmap and getting it ready for the next cycle. During |
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700 // this time no other cycle can start. So, let's make sure that this |
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701 // is the case. |
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702 guarantee(!g1h->mark_in_progress(), "invariant"); |
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703 |
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704 // clear the mark bitmap (no grey objects to start with). |
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705 // We need to do this in chunks and offer to yield in between |
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706 // each chunk. |
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707 HeapWord* start = _nextMarkBitMap->startWord(); |
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708 HeapWord* end = _nextMarkBitMap->endWord(); |
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709 HeapWord* cur = start; |
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710 size_t chunkSize = M; |
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711 while (cur < end) { |
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712 HeapWord* next = cur + chunkSize; |
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713 if (next > end) { |
|
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714 next = end; |
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715 } |
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716 MemRegion mr(cur,next); |
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717 _nextMarkBitMap->clearRange(mr); |
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718 cur = next; |
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719 do_yield_check(); |
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720 |
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721 // Repeat the asserts from above. We'll do them as asserts here to |
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722 // minimize their overhead on the product. However, we'll have |
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723 // them as guarantees at the beginning / end of the bitmap |
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724 // clearing to get some checking in the product. |
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725 assert(cmThread()->during_cycle(), "invariant"); |
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726 assert(!g1h->mark_in_progress(), "invariant"); |
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727 } |
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728 |
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729 // Clear the liveness counting data |
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730 clear_all_count_data(); |
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731 |
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732 // Repeat the asserts from above. |
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733 guarantee(cmThread()->during_cycle(), "invariant"); |
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734 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 735 } |
| 736 | |
| 737 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
| 738 public: | |
| 739 bool doHeapRegion(HeapRegion* r) { | |
| 740 if (!r->continuesHumongous()) { | |
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741 r->note_start_of_marking(); |
| 342 | 742 } |
| 743 return false; | |
| 744 } | |
| 745 }; | |
| 746 | |
| 747 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 748 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 749 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 750 | |
| 751 _has_aborted = false; | |
| 752 | |
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753 #ifndef PRODUCT |
| 1044 | 754 if (G1PrintReachableAtInitialMark) { |
| 1388 | 755 print_reachable("at-cycle-start", |
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756 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 757 } |
|
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758 #endif |
| 342 | 759 |
| 760 // Initialise marking structures. This has to be done in a STW phase. | |
| 761 reset(); | |
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762 |
|
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763 // For each region note start of marking. |
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764 NoteStartOfMarkHRClosure startcl; |
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765 g1h->heap_region_iterate(&startcl); |
| 342 | 766 } |
| 767 | |
| 768 | |
| 769 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 770 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 771 | |
|
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772 // If we force an overflow during remark, the remark operation will |
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773 // actually abort and we'll restart concurrent marking. If we always |
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774 // force an oveflow during remark we'll never actually complete the |
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775 // marking phase. So, we initilize this here, at the start of the |
|
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776 // cycle, so that at the remaining overflow number will decrease at |
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777 // every remark and we'll eventually not need to cause one. |
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778 force_overflow_stw()->init(); |
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779 |
|
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780 // Start Concurrent Marking weak-reference discovery. |
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781 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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782 // enable ("weak") refs discovery |
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783 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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784 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 785 |
| 786 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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787 // This is the start of the marking cycle, we're expected all |
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788 // threads to have SATB queues with active set to false. |
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789 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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790 false /* expected_active */); |
| 342 | 791 |
|
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792 _root_regions.prepare_for_scan(); |
|
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793 |
| 342 | 794 // update_g1_committed() will be called at the end of an evac pause |
| 795 // when marking is on. So, it's also called at the end of the | |
| 796 // initial-mark pause to update the heap end, if the heap expands | |
| 797 // during it. No need to call it here. | |
| 798 } | |
| 799 | |
| 800 /* | |
|
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801 * Notice that in the next two methods, we actually leave the STS |
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802 * during the barrier sync and join it immediately afterwards. If we |
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803 * do not do this, the following deadlock can occur: one thread could |
|
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804 * be in the barrier sync code, waiting for the other thread to also |
|
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805 * sync up, whereas another one could be trying to yield, while also |
|
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806 * waiting for the other threads to sync up too. |
|
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807 * |
|
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808 * Note, however, that this code is also used during remark and in |
|
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809 * this case we should not attempt to leave / enter the STS, otherwise |
|
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810 * we'll either hit an asseert (debug / fastdebug) or deadlock |
|
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811 * (product). So we should only leave / enter the STS if we are |
|
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812 * operating concurrently. |
|
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813 * |
|
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814 * Because the thread that does the sync barrier has left the STS, it |
|
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815 * is possible to be suspended for a Full GC or an evacuation pause |
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816 * could occur. This is actually safe, since the entering the sync |
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817 * barrier is one of the last things do_marking_step() does, and it |
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818 * doesn't manipulate any data structures afterwards. |
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819 */ |
| 342 | 820 |
|
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821 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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822 if (verbose_low()) { |
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823 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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824 } |
| 342 | 825 |
|
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826 if (concurrent()) { |
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827 ConcurrentGCThread::stsLeave(); |
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828 } |
| 342 | 829 _first_overflow_barrier_sync.enter(); |
|
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830 if (concurrent()) { |
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831 ConcurrentGCThread::stsJoin(); |
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832 } |
| 342 | 833 // at this point everyone should have synced up and not be doing any |
| 834 // more work | |
| 835 | |
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836 if (verbose_low()) { |
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837 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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838 } |
| 342 | 839 |
|
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840 // let the task associated with with worker 0 do this |
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841 if (worker_id == 0) { |
| 342 | 842 // task 0 is responsible for clearing the global data structures |
|
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843 // We should be here because of an overflow. During STW we should |
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844 // not clear the overflow flag since we rely on it being true when |
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845 // we exit this method to abort the pause and restart concurent |
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846 // marking. |
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847 clear_marking_state(concurrent() /* clear_overflow */); |
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848 force_overflow()->update(); |
| 342 | 849 |
|
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850 if (G1Log::fine()) { |
| 342 | 851 gclog_or_tty->date_stamp(PrintGCDateStamps); |
| 852 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 853 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
| 854 } | |
| 855 } | |
| 856 | |
| 857 // after this, each task should reset its own data structures then | |
| 858 // then go into the second barrier | |
| 859 } | |
| 860 | |
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861 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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862 if (verbose_low()) { |
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863 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
|
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864 } |
| 342 | 865 |
|
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866 if (concurrent()) { |
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867 ConcurrentGCThread::stsLeave(); |
|
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868 } |
| 342 | 869 _second_overflow_barrier_sync.enter(); |
|
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870 if (concurrent()) { |
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871 ConcurrentGCThread::stsJoin(); |
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872 } |
| 342 | 873 // at this point everything should be re-initialised and ready to go |
| 874 | |
|
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875 if (verbose_low()) { |
|
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876 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
|
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877 } |
| 342 | 878 } |
| 879 | |
|
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880 #ifndef PRODUCT |
|
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881 void ForceOverflowSettings::init() { |
|
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882 _num_remaining = G1ConcMarkForceOverflow; |
|
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883 _force = false; |
|
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884 update(); |
|
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885 } |
|
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886 |
|
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887 void ForceOverflowSettings::update() { |
|
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888 if (_num_remaining > 0) { |
|
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889 _num_remaining -= 1; |
|
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890 _force = true; |
|
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891 } else { |
|
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892 _force = false; |
|
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893 } |
|
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894 } |
|
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895 |
|
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896 bool ForceOverflowSettings::should_force() { |
|
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897 if (_force) { |
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898 _force = false; |
|
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899 return true; |
|
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900 } else { |
|
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901 return false; |
|
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902 } |
|
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903 } |
|
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904 #endif // !PRODUCT |
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905 |
| 342 | 906 class CMConcurrentMarkingTask: public AbstractGangTask { |
| 907 private: | |
| 908 ConcurrentMark* _cm; | |
| 909 ConcurrentMarkThread* _cmt; | |
| 910 | |
| 911 public: | |
|
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912 void work(uint worker_id) { |
|
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913 assert(Thread::current()->is_ConcurrentGC_thread(), |
|
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914 "this should only be done by a conc GC thread"); |
|
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|
915 ResourceMark rm; |
| 342 | 916 |
| 917 double start_vtime = os::elapsedVTime(); | |
| 918 | |
| 919 ConcurrentGCThread::stsJoin(); | |
| 920 | |
|
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921 assert(worker_id < _cm->active_tasks(), "invariant"); |
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922 CMTask* the_task = _cm->task(worker_id); |
| 342 | 923 the_task->record_start_time(); |
| 924 if (!_cm->has_aborted()) { | |
| 925 do { | |
| 926 double start_vtime_sec = os::elapsedVTime(); | |
| 927 double start_time_sec = os::elapsedTime(); | |
|
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928 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
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929 |
|
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930 the_task->do_marking_step(mark_step_duration_ms, |
|
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|
931 true /* do_stealing */, |
|
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|
932 true /* do_termination */); |
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|
933 |
| 342 | 934 double end_time_sec = os::elapsedTime(); |
| 935 double end_vtime_sec = os::elapsedVTime(); | |
| 936 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 937 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 938 _cm->clear_has_overflown(); | |
| 939 | |
|
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940 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 941 |
| 942 jlong sleep_time_ms; | |
| 943 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 944 sleep_time_ms = | |
| 945 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 946 ConcurrentGCThread::stsLeave(); | |
| 947 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 948 ConcurrentGCThread::stsJoin(); | |
| 949 } | |
| 950 double end_time2_sec = os::elapsedTime(); | |
| 951 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 952 | |
| 953 #if 0 | |
| 954 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 955 "overhead %1.4lf", | |
| 956 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 957 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 958 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 959 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 960 #endif | |
| 961 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 962 } | |
| 963 the_task->record_end_time(); | |
|
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964 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 965 |
| 966 ConcurrentGCThread::stsLeave(); | |
| 967 | |
| 968 double end_vtime = os::elapsedVTime(); | |
|
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969 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 970 } |
| 971 | |
| 972 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 973 ConcurrentMarkThread* cmt) : | |
| 974 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 975 | |
| 976 ~CMConcurrentMarkingTask() { } | |
| 977 }; | |
| 978 | |
|
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|
979 // Calculates the number of active workers for a concurrent |
|
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980 // phase. |
|
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981 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 982 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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983 uint n_conc_workers = 0; |
|
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984 if (!UseDynamicNumberOfGCThreads || |
|
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985 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
|
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986 !ForceDynamicNumberOfGCThreads)) { |
|
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987 n_conc_workers = max_parallel_marking_threads(); |
|
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988 } else { |
|
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989 n_conc_workers = |
|
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990 AdaptiveSizePolicy::calc_default_active_workers( |
|
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991 max_parallel_marking_threads(), |
|
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992 1, /* Minimum workers */ |
|
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993 parallel_marking_threads(), |
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994 Threads::number_of_non_daemon_threads()); |
|
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995 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
|
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996 // that scaling has already gone into "_max_parallel_marking_threads". |
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997 } |
| 4711 | 998 assert(n_conc_workers > 0, "Always need at least 1"); |
| 999 return n_conc_workers; | |
|
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1000 } |
| 4711 | 1001 // If we are not running with any parallel GC threads we will not |
| 1002 // have spawned any marking threads either. Hence the number of | |
| 1003 // concurrent workers should be 0. | |
| 1004 return 0; | |
|
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1005 } |
|
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1006 |
|
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1007 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
|
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1008 // Currently, only survivors can be root regions. |
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1009 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1010 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1011 |
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1012 const uintx interval = PrefetchScanIntervalInBytes; |
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1013 HeapWord* curr = hr->bottom(); |
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1014 const HeapWord* end = hr->top(); |
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1015 while (curr < end) { |
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1016 Prefetch::read(curr, interval); |
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1017 oop obj = oop(curr); |
|
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1018 int size = obj->oop_iterate(&cl); |
|
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1019 assert(size == obj->size(), "sanity"); |
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1020 curr += size; |
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1021 } |
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1022 } |
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1023 |
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1024 class CMRootRegionScanTask : public AbstractGangTask { |
|
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1025 private: |
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1026 ConcurrentMark* _cm; |
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1027 |
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1028 public: |
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1029 CMRootRegionScanTask(ConcurrentMark* cm) : |
|
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1030 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1031 |
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1032 void work(uint worker_id) { |
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1033 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1034 "this should only be done by a conc GC thread"); |
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1035 |
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1036 CMRootRegions* root_regions = _cm->root_regions(); |
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1037 HeapRegion* hr = root_regions->claim_next(); |
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1038 while (hr != NULL) { |
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1039 _cm->scanRootRegion(hr, worker_id); |
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1040 hr = root_regions->claim_next(); |
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1041 } |
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1042 } |
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1043 }; |
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1044 |
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1045 void ConcurrentMark::scanRootRegions() { |
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1046 // scan_in_progress() will have been set to true only if there was |
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1047 // at least one root region to scan. So, if it's false, we |
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1048 // should not attempt to do any further work. |
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1049 if (root_regions()->scan_in_progress()) { |
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1050 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1051 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1052 "Maximum number of marking threads exceeded"); |
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1053 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1054 |
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1055 CMRootRegionScanTask task(this); |
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1056 if (parallel_marking_threads() > 0) { |
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1057 _parallel_workers->set_active_workers((int) active_workers); |
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1058 _parallel_workers->run_task(&task); |
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1059 } else { |
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1060 task.work(0); |
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1061 } |
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1062 |
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1063 // It's possible that has_aborted() is true here without actually |
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1064 // aborting the survivor scan earlier. This is OK as it's |
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1065 // mainly used for sanity checking. |
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1066 root_regions()->scan_finished(); |
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1067 } |
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1068 } |
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1069 |
| 342 | 1070 void ConcurrentMark::markFromRoots() { |
| 1071 // we might be tempted to assert that: | |
| 1072 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1073 // "inconsistent argument?"); | |
| 1074 // However that wouldn't be right, because it's possible that | |
| 1075 // a safepoint is indeed in progress as a younger generation | |
| 1076 // stop-the-world GC happens even as we mark in this generation. | |
| 1077 | |
| 1078 _restart_for_overflow = false; | |
|
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1079 force_overflow_conc()->init(); |
|
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1080 |
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1081 // _g1h has _n_par_threads |
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1082 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1083 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1084 "Maximum number of marking threads exceeded"); |
| 4711 | 1085 |
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1086 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1087 |
| 1088 // Parallel task terminator is set in "set_phase()" | |
| 1089 set_phase(active_workers, true /* concurrent */); | |
| 342 | 1090 |
| 1091 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1092 if (parallel_marking_threads() > 0) { |
| 4711 | 1093 _parallel_workers->set_active_workers((int)active_workers); |
| 1094 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
| 1095 // and the decisions on that MT processing is made elsewhere. | |
| 1096 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1097 _parallel_workers->run_task(&markingTask); |
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1098 } else { |
| 342 | 1099 markingTask.work(0); |
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1100 } |
| 342 | 1101 print_stats(); |
| 1102 } | |
| 1103 | |
| 1104 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1105 // world is stopped at this checkpoint | |
| 1106 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1107 "world should be stopped"); | |
|
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1108 |
| 342 | 1109 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1110 | |
| 1111 // If a full collection has happened, we shouldn't do this. | |
| 1112 if (has_aborted()) { | |
| 1113 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1114 return; | |
| 1115 } | |
| 1116 | |
|
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1117 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1118 |
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1119 if (VerifyDuringGC) { |
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1120 HandleMark hm; // handle scope |
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1121 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1122 Universe::heap()->prepare_for_verify(); |
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1123 Universe::verify(/* silent */ false, |
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1124 /* option */ VerifyOption_G1UsePrevMarking); |
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1125 } |
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1126 |
| 342 | 1127 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1128 g1p->record_concurrent_mark_remark_start(); | |
| 1129 | |
| 1130 double start = os::elapsedTime(); | |
| 1131 | |
| 1132 checkpointRootsFinalWork(); | |
| 1133 | |
| 1134 double mark_work_end = os::elapsedTime(); | |
| 1135 | |
| 1136 weakRefsWork(clear_all_soft_refs); | |
| 1137 | |
| 1138 if (has_overflown()) { | |
| 1139 // Oops. We overflowed. Restart concurrent marking. | |
| 1140 _restart_for_overflow = true; | |
| 1141 // Clear the flag. We do not need it any more. | |
| 1142 clear_has_overflown(); | |
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1143 if (G1TraceMarkStackOverflow) { |
| 342 | 1144 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1145 } |
| 342 | 1146 } else { |
|
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1147 // Aggregate the per-task counting data that we have accumulated |
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1148 // while marking. |
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1149 aggregate_count_data(); |
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1150 |
| 2149 | 1151 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1152 // We're done with marking. |
|
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1153 // This is the end of the marking cycle, we're expected all |
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1154 // threads to have SATB queues with active set to true. |
| 2149 | 1155 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1156 true /* expected_active */); | |
| 811 | 1157 |
| 1158 if (VerifyDuringGC) { | |
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1159 HandleMark hm; // handle scope |
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1160 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1161 Universe::heap()->prepare_for_verify(); |
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1162 Universe::verify(/* silent */ false, |
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1163 /* option */ VerifyOption_G1UseNextMarking); |
| 811 | 1164 } |
|
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1165 assert(!restart_for_overflow(), "sanity"); |
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1166 } |
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1167 |
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1168 // Reset the marking state if marking completed |
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1169 if (!restart_for_overflow()) { |
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1170 set_non_marking_state(); |
| 342 | 1171 } |
| 1172 | |
| 1173 #if VERIFY_OBJS_PROCESSED | |
| 1174 _scan_obj_cl.objs_processed = 0; | |
| 1175 ThreadLocalObjQueue::objs_enqueued = 0; | |
| 1176 #endif | |
| 1177 | |
| 1178 // Statistics | |
| 1179 double now = os::elapsedTime(); | |
| 1180 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1181 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1182 _remark_times.add((now - start) * 1000.0); | |
| 1183 | |
| 1184 g1p->record_concurrent_mark_remark_end(); | |
| 1185 } | |
| 1186 | |
|
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1187 // Base class of the closures that finalize and verify the |
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1188 // liveness counting data. |
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1189 class CMCountDataClosureBase: public HeapRegionClosure { |
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1190 protected: |
|
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1191 G1CollectedHeap* _g1h; |
| 342 | 1192 ConcurrentMark* _cm; |
|
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1193 CardTableModRefBS* _ct_bs; |
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1194 |
| 342 | 1195 BitMap* _region_bm; |
| 1196 BitMap* _card_bm; | |
|
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1197 |
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1198 // Takes a region that's not empty (i.e., it has at least one |
| 829 | 1199 // live object in it and sets its corresponding bit on the region |
| 1200 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1201 // to 1 the bits on the region bitmap that correspond to its | |
| 1202 // associated "continues humongous" regions. | |
| 1203 void set_bit_for_region(HeapRegion* hr) { | |
| 1204 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1205 | |
|
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1206 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
| 829 | 1207 if (!hr->startsHumongous()) { |
| 1208 // Normal (non-humongous) case: just set the bit. | |
|
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1209 _region_bm->par_at_put(index, true); |
| 829 | 1210 } else { |
| 1211 // Starts humongous case: calculate how many regions are part of | |
|
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1212 // this humongous region and then set the bit range. |
|
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1213 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
|
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1214 _region_bm->par_at_put_range(index, end_index, true); |
| 829 | 1215 } |
| 1216 } | |
| 1217 | |
|
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1218 public: |
|
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1219 CMCountDataClosureBase(G1CollectedHeap* g1h, |
|
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1220 BitMap* region_bm, BitMap* card_bm): |
|
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1221 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1222 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1223 _region_bm(region_bm), _card_bm(card_bm) { } |
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1224 }; |
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1225 |
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1226 // Closure that calculates the # live objects per region. Used |
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1227 // for verification purposes during the cleanup pause. |
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1228 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1229 CMBitMapRO* _bm; |
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1230 size_t _region_marked_bytes; |
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1231 |
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1232 public: |
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1233 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1234 BitMap* region_bm, BitMap* card_bm) : |
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1235 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1236 _bm(bm), _region_marked_bytes(0) { } |
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1237 |
| 342 | 1238 bool doHeapRegion(HeapRegion* hr) { |
| 1239 | |
| 639 | 1240 if (hr->continuesHumongous()) { |
| 829 | 1241 // We will ignore these here and process them when their |
| 1242 // associated "starts humongous" region is processed (see | |
| 1243 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1244 // associated "starts humongous" region to have their bit set to | |
| 1245 // 1 since, due to the region chunking in the parallel region | |
| 1246 // iteration, a "continues humongous" region might be visited | |
| 1247 // before its associated "starts humongous". | |
| 639 | 1248 return false; |
| 1249 } | |
| 342 | 1250 |
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1251 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1252 HeapWord* start = hr->bottom(); |
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1253 |
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1254 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1255 err_msg("Preconditions not met - " |
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1256 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1257 start, ntams, hr->end())); |
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1258 |
| 342 | 1259 // Find the first marked object at or after "start". |
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1260 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1261 |
| 342 | 1262 size_t marked_bytes = 0; |
| 1263 | |
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1264 while (start < ntams) { |
| 342 | 1265 oop obj = oop(start); |
| 1266 int obj_sz = obj->size(); | |
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1267 HeapWord* obj_end = start + obj_sz; |
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1268 |
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1269 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1270 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1271 |
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1272 // Note: if we're looking at the last region in heap - obj_end |
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1273 // could be actually just beyond the end of the heap; end_idx |
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1274 // will then correspond to a (non-existent) card that is also |
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1275 // just beyond the heap. |
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1276 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1277 // end of object is not card aligned - increment to cover |
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1278 // all the cards spanned by the object |
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1279 end_idx += 1; |
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1280 } |
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1281 |
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1282 // Set the bits in the card BM for the cards spanned by this object. |
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1283 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1284 |
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1285 // Add the size of this object to the number of marked bytes. |
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1286 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1287 |
| 342 | 1288 // Find the next marked object after this one. |
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1289 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
|
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1290 } |
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1291 |
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1292 // Mark the allocated-since-marking portion... |
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1293 HeapWord* top = hr->top(); |
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1294 if (ntams < top) { |
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1295 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1296 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1297 |
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1298 // Note: if we're looking at the last region in heap - top |
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1299 // could be actually just beyond the end of the heap; end_idx |
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1300 // will then correspond to a (non-existent) card that is also |
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1301 // just beyond the heap. |
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1302 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1303 // end of object is not card aligned - increment to cover |
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1304 // all the cards spanned by the object |
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1305 end_idx += 1; |
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1306 } |
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1307 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1308 |
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1309 // This definitely means the region has live objects. |
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1310 set_bit_for_region(hr); |
| 342 | 1311 } |
| 1312 | |
| 1313 // Update the live region bitmap. | |
| 1314 if (marked_bytes > 0) { | |
| 829 | 1315 set_bit_for_region(hr); |
| 342 | 1316 } |
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1317 |
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1318 // Set the marked bytes for the current region so that |
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1319 // it can be queried by a calling verificiation routine |
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1320 _region_marked_bytes = marked_bytes; |
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1321 |
| 342 | 1322 return false; |
| 1323 } | |
| 1324 | |
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1325 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1326 }; |
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1327 |
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1328 // Heap region closure used for verifying the counting data |
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1329 // that was accumulated concurrently and aggregated during |
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1330 // the remark pause. This closure is applied to the heap |
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1331 // regions during the STW cleanup pause. |
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1332 |
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1333 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1334 G1CollectedHeap* _g1h; |
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1335 ConcurrentMark* _cm; |
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1336 CalcLiveObjectsClosure _calc_cl; |
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1337 BitMap* _region_bm; // Region BM to be verified |
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1338 BitMap* _card_bm; // Card BM to be verified |
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1339 bool _verbose; // verbose output? |
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1340 |
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1341 BitMap* _exp_region_bm; // Expected Region BM values |
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1342 BitMap* _exp_card_bm; // Expected card BM values |
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1343 |
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1344 int _failures; |
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1345 |
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1346 public: |
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1347 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1348 BitMap* region_bm, |
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1349 BitMap* card_bm, |
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1350 BitMap* exp_region_bm, |
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1351 BitMap* exp_card_bm, |
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1352 bool verbose) : |
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1353 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1354 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
|
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1355 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1356 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1357 _failures(0) { } |
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1358 |
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1359 int failures() const { return _failures; } |
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1360 |
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1361 bool doHeapRegion(HeapRegion* hr) { |
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1362 if (hr->continuesHumongous()) { |
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1363 // We will ignore these here and process them when their |
|
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1364 // associated "starts humongous" region is processed (see |
|
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1365 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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1366 // associated "starts humongous" region to have their bit set to |
|
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1367 // 1 since, due to the region chunking in the parallel region |
|
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1368 // iteration, a "continues humongous" region might be visited |
|
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1369 // before its associated "starts humongous". |
|
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1370 return false; |
|
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|
1371 } |
|
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|
1372 |
|
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1373 int failures = 0; |
|
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|
1374 |
|
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|
1375 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
|
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1376 // this region and set the corresponding bits in the expected region |
|
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1377 // and card bitmaps. |
|
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|
1378 bool res = _calc_cl.doHeapRegion(hr); |
|
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1379 assert(res == false, "should be continuing"); |
|
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1380 |
|
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1381 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
|
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1382 Mutex::_no_safepoint_check_flag); |
|
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1383 |
|
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1384 // Verify the marked bytes for this region. |
|
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1385 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
|
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1386 size_t act_marked_bytes = hr->next_marked_bytes(); |
|
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1387 |
|
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1388 // We're not OK if expected marked bytes > actual marked bytes. It means |
|
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|
1389 // we have missed accounting some objects during the actual marking. |
|
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1390 if (exp_marked_bytes > act_marked_bytes) { |
|
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1391 if (_verbose) { |
|
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1392 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
|
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1393 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
|
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1394 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
|
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|
1395 } |
|
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1396 failures += 1; |
|
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|
1397 } |
|
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|
1398 |
|
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|
1399 // Verify the bit, for this region, in the actual and expected |
|
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1400 // (which was just calculated) region bit maps. |
|
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1401 // We're not OK if the bit in the calculated expected region |
|
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1402 // bitmap is set and the bit in the actual region bitmap is not. |
|
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1403 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
|
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1404 |
|
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|
1405 bool expected = _exp_region_bm->at(index); |
|
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1406 bool actual = _region_bm->at(index); |
|
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1407 if (expected && !actual) { |
|
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1408 if (_verbose) { |
|
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1409 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
|
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|
1410 "expected: %s, actual: %s", |
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|
1411 hr->hrs_index(), |
|
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1412 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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|
1413 } |
|
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|
1414 failures += 1; |
|
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|
1415 } |
|
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|
1416 |
|
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|
1417 // Verify that the card bit maps for the cards spanned by the current |
|
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|
1418 // region match. We have an error if we have a set bit in the expected |
|
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|
1419 // bit map and the corresponding bit in the actual bitmap is not set. |
|
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|
1420 |
|
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|
1421 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
|
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|
1422 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
|
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|
1423 |
|
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|
1424 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
|
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|
1425 expected = _exp_card_bm->at(i); |
|
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|
1426 actual = _card_bm->at(i); |
|
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|
1427 |
|
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|
1428 if (expected && !actual) { |
|
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|
1429 if (_verbose) { |
|
6010
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|
1430 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
|
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|
1431 "expected: %s, actual: %s", |
|
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|
1432 hr->hrs_index(), i, |
|
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changeset
|
1433 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
4836
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|
1434 } |
|
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|
1435 failures += 1; |
|
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|
1436 } |
|
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|
1437 } |
|
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|
1438 |
|
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|
1439 if (failures > 0 && _verbose) { |
|
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|
1440 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
|
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|
1441 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
|
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|
1442 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
|
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|
1443 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
|
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|
1444 } |
|
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|
1445 |
|
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|
1446 _failures += failures; |
|
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|
1447 |
|
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|
1448 // We could stop iteration over the heap when we |
|
6027
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|
1449 // find the first violating region by returning true. |
|
4836
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|
1450 return false; |
|
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|
1451 } |
| 342 | 1452 }; |
| 1453 | |
| 1454 | |
|
4836
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|
1455 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
|
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|
1456 protected: |
|
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|
1457 G1CollectedHeap* _g1h; |
|
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|
1458 ConcurrentMark* _cm; |
|
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|
1459 BitMap* _actual_region_bm; |
|
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|
1460 BitMap* _actual_card_bm; |
|
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|
1461 |
|
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|
1462 uint _n_workers; |
|
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|
1463 |
|
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changeset
|
1464 BitMap* _expected_region_bm; |
|
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|
1465 BitMap* _expected_card_bm; |
|
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|
1466 |
|
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|
1467 int _failures; |
|
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changeset
|
1468 bool _verbose; |
|
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|
1469 |
|
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changeset
|
1470 public: |
|
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changeset
|
1471 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
|
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|
1472 BitMap* region_bm, BitMap* card_bm, |
|
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changeset
|
1473 BitMap* expected_region_bm, BitMap* expected_card_bm) |
|
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|
1474 : AbstractGangTask("G1 verify final counting"), |
|
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|
1475 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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changeset
|
1476 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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changeset
|
1477 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
|
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changeset
|
1478 _failures(0), _verbose(false), |
|
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|
1479 _n_workers(0) { |
|
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changeset
|
1480 assert(VerifyDuringGC, "don't call this otherwise"); |
|
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|
1481 |
|
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changeset
|
1482 // Use the value already set as the number of active threads |
|
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|
1483 // in the call to run_task(). |
|
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1484 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1485 assert( _g1h->workers()->active_workers() > 0, |
|
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|
1486 "Should have been previously set"); |
|
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1487 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1488 } else { |
|
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|
1489 _n_workers = 1; |
|
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|
1490 } |
|
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|
1491 |
|
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|
1492 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
|
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|
1493 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
|
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|
1494 |
|
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|
1495 _verbose = _cm->verbose_medium(); |
|
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|
1496 } |
|
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|
1497 |
|
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|
1498 void work(uint worker_id) { |
|
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|
1499 assert(worker_id < _n_workers, "invariant"); |
|
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|
1500 |
|
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|
1501 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
|
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|
1502 _actual_region_bm, _actual_card_bm, |
|
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1503 _expected_region_bm, |
|
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|
1504 _expected_card_bm, |
|
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|
1505 _verbose); |
|
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|
1506 |
|
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|
1507 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1508 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
|
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|
1509 worker_id, |
|
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|
1510 _n_workers, |
|
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|
1511 HeapRegion::VerifyCountClaimValue); |
|
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1512 } else { |
|
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|
1513 _g1h->heap_region_iterate(&verify_cl); |
|
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|
1514 } |
|
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|
1515 |
|
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|
1516 Atomic::add(verify_cl.failures(), &_failures); |
|
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|
1517 } |
|
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|
1518 |
|
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|
1519 int failures() const { return _failures; } |
|
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1520 }; |
|
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|
1521 |
|
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|
1522 // Closure that finalizes the liveness counting data. |
|
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1523 // Used during the cleanup pause. |
|
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1524 // Sets the bits corresponding to the interval [NTAMS, top] |
|
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1525 // (which contains the implicitly live objects) in the |
|
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1526 // card liveness bitmap. Also sets the bit for each region, |
|
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1527 // containing live data, in the region liveness bitmap. |
|
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1528 |
|
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|
1529 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
|
4836
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|
1530 public: |
|
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|
1531 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
|
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1532 BitMap* region_bm, |
|
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|
1533 BitMap* card_bm) : |
|
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1534 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
|
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|
1535 |
|
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|
1536 bool doHeapRegion(HeapRegion* hr) { |
|
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|
1537 |
|
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|
1538 if (hr->continuesHumongous()) { |
|
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1539 // We will ignore these here and process them when their |
|
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1540 // associated "starts humongous" region is processed (see |
|
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1541 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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|
1542 // associated "starts humongous" region to have their bit set to |
|
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|
1543 // 1 since, due to the region chunking in the parallel region |
|
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1544 // iteration, a "continues humongous" region might be visited |
|
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|
1545 // before its associated "starts humongous". |
|
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|
1546 return false; |
|
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|
1547 } |
|
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|
1548 |
|
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|
1549 HeapWord* ntams = hr->next_top_at_mark_start(); |
|
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|
1550 HeapWord* top = hr->top(); |
|
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|
1551 |
|
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|
1552 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
|
4836
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|
1553 |
|
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|
1554 // Mark the allocated-since-marking portion... |
|
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|
1555 if (ntams < top) { |
|
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|
1556 // This definitely means the region has live objects. |
|
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|
1557 set_bit_for_region(hr); |
|
6812
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changeset
|
1558 |
|
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changeset
|
1559 // Now set the bits in the card bitmap for [ntams, top) |
|
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|
1560 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
|
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|
1561 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
|
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changeset
|
1562 |
|
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changeset
|
1563 // Note: if we're looking at the last region in heap - top |
|
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|
1564 // could be actually just beyond the end of the heap; end_idx |
|
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|
1565 // will then correspond to a (non-existent) card that is also |
|
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|
1566 // just beyond the heap. |
|
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|
1567 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
|
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|
1568 // end of object is not card aligned - increment to cover |
|
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|
1569 // all the cards spanned by the object |
|
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|
1570 end_idx += 1; |
|
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|
1571 } |
|
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changeset
|
1572 |
|
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changeset
|
1573 assert(end_idx <= _card_bm->size(), |
|
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changeset
|
1574 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
|
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|
1575 end_idx, _card_bm->size())); |
|
988bf00cc564
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|
1576 assert(start_idx < _card_bm->size(), |
|
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|
1577 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
|
988bf00cc564
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changeset
|
1578 start_idx, _card_bm->size())); |
|
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changeset
|
1579 |
|
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changeset
|
1580 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
|
6725
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|
1581 } |
|
4836
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changeset
|
1582 |
|
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|
1583 // Set the bit for the region if it contains live data |
|
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|
1584 if (hr->next_marked_bytes() > 0) { |
|
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|
1585 set_bit_for_region(hr); |
|
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|
1586 } |
|
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diff
changeset
|
1587 |
|
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diff
changeset
|
1588 return false; |
|
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diff
changeset
|
1589 } |
|
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|
1590 }; |
| 342 | 1591 |
| 1592 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1593 protected: | |
| 1594 G1CollectedHeap* _g1h; | |
|
4836
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|
1595 ConcurrentMark* _cm; |
|
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|
1596 BitMap* _actual_region_bm; |
|
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changeset
|
1597 BitMap* _actual_card_bm; |
|
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diff
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|
1598 |
|
4728
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|
1599 uint _n_workers; |
|
4836
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|
1600 |
| 342 | 1601 public: |
|
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|
1602 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
|
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|
1603 : AbstractGangTask("G1 final counting"), |
|
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|
1604 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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|
1605 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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|
1606 _n_workers(0) { |
|
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
1607 // Use the value already set as the number of active threads |
| 6011 | 1608 // in the call to run_task(). |
|
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1609 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1610 assert( _g1h->workers()->active_workers() > 0, |
|
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1611 "Should have been previously set"); |
|
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1612 _n_workers = _g1h->workers()->active_workers(); |
|
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1613 } else { |
| 342 | 1614 _n_workers = 1; |
|
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1615 } |
| 342 | 1616 } |
| 1617 | |
|
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1618 void work(uint worker_id) { |
|
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1619 assert(worker_id < _n_workers, "invariant"); |
|
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1620 |
|
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|
1621 FinalCountDataUpdateClosure final_update_cl(_g1h, |
|
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1622 _actual_region_bm, |
|
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|
1623 _actual_card_bm); |
|
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1624 |
|
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|
1625 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1626 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
|
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1627 worker_id, |
|
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|
1628 _n_workers, |
| 355 | 1629 HeapRegion::FinalCountClaimValue); |
| 342 | 1630 } else { |
|
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|
1631 _g1h->heap_region_iterate(&final_update_cl); |
| 342 | 1632 } |
| 1633 } | |
| 1634 }; | |
| 1635 | |
| 1636 class G1ParNoteEndTask; | |
| 1637 | |
| 1638 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1639 G1CollectedHeap* _g1; | |
| 1640 int _worker_num; | |
| 1641 size_t _max_live_bytes; | |
|
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1642 uint _regions_claimed; |
| 342 | 1643 size_t _freed_bytes; |
| 2173 | 1644 FreeRegionList* _local_cleanup_list; |
| 4072 | 1645 OldRegionSet* _old_proxy_set; |
| 2173 | 1646 HumongousRegionSet* _humongous_proxy_set; |
| 1647 HRRSCleanupTask* _hrrs_cleanup_task; | |
| 342 | 1648 double _claimed_region_time; |
| 1649 double _max_region_time; | |
| 1650 | |
| 1651 public: | |
| 1652 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1653 int worker_num, |
| 1654 FreeRegionList* local_cleanup_list, | |
| 4072 | 1655 OldRegionSet* old_proxy_set, |
| 2173 | 1656 HumongousRegionSet* humongous_proxy_set, |
|
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|
1657 HRRSCleanupTask* hrrs_cleanup_task) : |
|
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1658 _g1(g1), _worker_num(worker_num), |
|
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|
1659 _max_live_bytes(0), _regions_claimed(0), |
|
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|
1660 _freed_bytes(0), |
|
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|
1661 _claimed_region_time(0.0), _max_region_time(0.0), |
|
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|
1662 _local_cleanup_list(local_cleanup_list), |
|
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|
1663 _old_proxy_set(old_proxy_set), |
|
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|
1664 _humongous_proxy_set(humongous_proxy_set), |
|
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|
1665 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
|
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|
1666 |
| 342 | 1667 size_t freed_bytes() { return _freed_bytes; } |
| 1668 | |
|
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|
1669 bool doHeapRegion(HeapRegion *hr) { |
|
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1670 if (hr->continuesHumongous()) { |
|
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|
1671 return false; |
|
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|
1672 } |
|
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|
1673 // We use a claim value of zero here because all regions |
|
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|
1674 // were claimed with value 1 in the FinalCount task. |
|
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|
1675 _g1->reset_gc_time_stamps(hr); |
|
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|
1676 double start = os::elapsedTime(); |
|
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|
1677 _regions_claimed++; |
|
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|
1678 hr->note_end_of_marking(); |
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|
1679 _max_live_bytes += hr->max_live_bytes(); |
|
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|
1680 _g1->free_region_if_empty(hr, |
|
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|
1681 &_freed_bytes, |
|
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|
1682 _local_cleanup_list, |
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|
1683 _old_proxy_set, |
|
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|
1684 _humongous_proxy_set, |
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|
1685 _hrrs_cleanup_task, |
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|
1686 true /* par */); |
|
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|
1687 double region_time = (os::elapsedTime() - start); |
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|
1688 _claimed_region_time += region_time; |
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|
1689 if (region_time > _max_region_time) { |
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|
1690 _max_region_time = region_time; |
|
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|
1691 } |
|
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|
1692 return false; |
|
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|
1693 } |
| 342 | 1694 |
| 1695 size_t max_live_bytes() { return _max_live_bytes; } | |
|
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|
1696 uint regions_claimed() { return _regions_claimed; } |
| 342 | 1697 double claimed_region_time_sec() { return _claimed_region_time; } |
| 1698 double max_region_time_sec() { return _max_region_time; } | |
| 1699 }; | |
| 1700 | |
| 1701 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1702 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1703 |
| 342 | 1704 protected: |
| 1705 G1CollectedHeap* _g1h; | |
| 1706 size_t _max_live_bytes; | |
| 1707 size_t _freed_bytes; | |
| 2152 | 1708 FreeRegionList* _cleanup_list; |
| 1709 | |
| 342 | 1710 public: |
| 1711 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1712 FreeRegionList* cleanup_list) : |
| 342 | 1713 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1714 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1715 |
|
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1716 void work(uint worker_id) { |
| 342 | 1717 double start = os::elapsedTime(); |
| 2173 | 1718 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 4072 | 1719 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
| 2173 | 1720 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
| 1721 HRRSCleanupTask hrrs_cleanup_task; | |
|
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1722 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
| 4072 | 1723 &old_proxy_set, |
| 2173 | 1724 &humongous_proxy_set, |
| 1725 &hrrs_cleanup_task); | |
|
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|
1726 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1727 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
|
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1728 _g1h->workers()->active_workers(), |
| 355 | 1729 HeapRegion::NoteEndClaimValue); |
| 342 | 1730 } else { |
| 1731 _g1h->heap_region_iterate(&g1_note_end); | |
| 1732 } | |
| 1733 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1734 | |
| 2152 | 1735 // Now update the lists |
| 1736 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
| 1737 NULL /* free_list */, | |
| 4072 | 1738 &old_proxy_set, |
| 2173 | 1739 &humongous_proxy_set, |
| 2152 | 1740 true /* par */); |
| 342 | 1741 { |
| 1742 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 1743 _max_live_bytes += g1_note_end.max_live_bytes(); | |
| 1744 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1745 |
|
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1746 // If we iterate over the global cleanup list at the end of |
|
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1747 // cleanup to do this printing we will not guarantee to only |
|
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|
1748 // generate output for the newly-reclaimed regions (the list |
|
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1749 // might not be empty at the beginning of cleanup; we might |
|
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|
1750 // still be working on its previous contents). So we do the |
|
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|
1751 // printing here, before we append the new regions to the global |
|
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|
1752 // cleanup list. |
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1753 |
|
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1754 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
|
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1755 if (hr_printer->is_active()) { |
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|
1756 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
|
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1757 while (iter.more_available()) { |
|
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|
1758 HeapRegion* hr = iter.get_next(); |
|
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|
1759 hr_printer->cleanup(hr); |
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|
1760 } |
|
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|
1761 } |
|
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|
1762 |
| 2173 | 1763 _cleanup_list->add_as_tail(&local_cleanup_list); |
| 1764 assert(local_cleanup_list.is_empty(), "post-condition"); | |
| 1765 | |
| 1766 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1767 } |
| 1768 } | |
| 1769 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1770 size_t freed_bytes() { return _freed_bytes; } | |
| 1771 }; | |
| 1772 | |
| 1773 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 1774 protected: | |
| 1775 G1RemSet* _g1rs; | |
| 1776 BitMap* _region_bm; | |
| 1777 BitMap* _card_bm; | |
| 1778 public: | |
| 1779 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 1780 BitMap* region_bm, BitMap* card_bm) : | |
| 1781 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
|
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1782 _region_bm(region_bm), _card_bm(card_bm) { } |
| 342 | 1783 |
|
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1784 void work(uint worker_id) { |
|
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1785 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1786 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 1787 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 1788 } else { |
| 1789 _g1rs->scrub(_region_bm, _card_bm); | |
| 1790 } | |
| 1791 } | |
| 1792 | |
| 1793 }; | |
| 1794 | |
| 1795 void ConcurrentMark::cleanup() { | |
| 1796 // world is stopped at this checkpoint | |
| 1797 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1798 "world should be stopped"); | |
| 1799 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1800 | |
| 1801 // If a full collection has happened, we shouldn't do this. | |
| 1802 if (has_aborted()) { | |
| 1803 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1804 return; | |
| 1805 } | |
| 1806 | |
| 4072 | 1807 HRSPhaseSetter x(HRSPhaseCleanup); |
| 2152 | 1808 g1h->verify_region_sets_optional(); |
| 1809 | |
|
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1810 if (VerifyDuringGC) { |
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1811 HandleMark hm; // handle scope |
|
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|
1812 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
|
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|
1813 Universe::heap()->prepare_for_verify(); |
|
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1814 Universe::verify(/* silent */ false, |
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1815 /* option */ VerifyOption_G1UsePrevMarking); |
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1816 } |
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1817 |
| 342 | 1818 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 1819 g1p->record_concurrent_mark_cleanup_start(); | |
| 1820 | |
| 1821 double start = os::elapsedTime(); | |
| 1822 | |
| 2173 | 1823 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 1824 | |
|
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1825 uint n_workers; |
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1826 |
| 342 | 1827 // Do counting once more with the world stopped for good measure. |
|
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1828 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1829 |
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1830 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1831 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
| 355 | 1832 "sanity check"); |
| 1833 | |
| 4711 | 1834 g1h->set_par_threads(); |
| 1835 n_workers = g1h->n_par_threads(); | |
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1836 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 1837 "Should not have been reset"); |
| 342 | 1838 g1h->workers()->run_task(&g1_par_count_task); |
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1839 // Done with the parallel phase so reset to 0. |
| 342 | 1840 g1h->set_par_threads(0); |
| 355 | 1841 |
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1842 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
| 355 | 1843 "sanity check"); |
| 342 | 1844 } else { |
| 4711 | 1845 n_workers = 1; |
| 342 | 1846 g1_par_count_task.work(0); |
| 1847 } | |
| 1848 | |
|
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1849 if (VerifyDuringGC) { |
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1850 // Verify that the counting data accumulated during marking matches |
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1851 // that calculated by walking the marking bitmap. |
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1852 |
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1853 // Bitmaps to hold expected values |
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1854 BitMap expected_region_bm(_region_bm.size(), false); |
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1855 BitMap expected_card_bm(_card_bm.size(), false); |
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1856 |
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1857 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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1858 &_region_bm, |
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1859 &_card_bm, |
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1860 &expected_region_bm, |
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1861 &expected_card_bm); |
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1862 |
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1863 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1864 g1h->set_par_threads((int)n_workers); |
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1865 g1h->workers()->run_task(&g1_par_verify_task); |
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1866 // Done with the parallel phase so reset to 0. |
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1867 g1h->set_par_threads(0); |
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1868 |
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1869 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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1870 "sanity check"); |
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1871 } else { |
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1872 g1_par_verify_task.work(0); |
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1873 } |
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1874 |
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1875 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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1876 } |
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1877 |
| 342 | 1878 size_t start_used_bytes = g1h->used(); |
| 1879 g1h->set_marking_complete(); | |
| 1880 | |
| 1881 double count_end = os::elapsedTime(); | |
| 1882 double this_final_counting_time = (count_end - start); | |
| 1883 _total_counting_time += this_final_counting_time; | |
| 1884 | |
|
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1885 if (G1PrintRegionLivenessInfo) { |
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1886 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1887 _g1h->heap_region_iterate(&cl); |
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1888 } |
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1889 |
| 342 | 1890 // Install newly created mark bitMap as "prev". |
| 1891 swapMarkBitMaps(); | |
| 1892 | |
| 1893 g1h->reset_gc_time_stamp(); | |
| 1894 | |
| 1895 // Note end of marking in all heap regions. | |
| 2152 | 1896 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
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1897 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1898 g1h->set_par_threads((int)n_workers); |
| 342 | 1899 g1h->workers()->run_task(&g1_par_note_end_task); |
| 1900 g1h->set_par_threads(0); | |
| 355 | 1901 |
| 1902 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 1903 "sanity check"); | |
| 342 | 1904 } else { |
| 1905 g1_par_note_end_task.work(0); | |
| 1906 } | |
|
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1907 g1h->check_gc_time_stamps(); |
| 2152 | 1908 |
| 1909 if (!cleanup_list_is_empty()) { | |
| 1910 // The cleanup list is not empty, so we'll have to process it | |
| 1911 // concurrently. Notify anyone else that might be wanting free | |
| 1912 // regions that there will be more free regions coming soon. | |
| 1913 g1h->set_free_regions_coming(); | |
| 1914 } | |
| 342 | 1915 |
| 1916 // call below, since it affects the metric by which we sort the heap | |
| 1917 // regions. | |
| 1918 if (G1ScrubRemSets) { | |
| 1919 double rs_scrub_start = os::elapsedTime(); | |
| 1920 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
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1921 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1922 g1h->set_par_threads((int)n_workers); |
| 342 | 1923 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 1924 g1h->set_par_threads(0); | |
| 355 | 1925 |
| 1926 assert(g1h->check_heap_region_claim_values( | |
| 1927 HeapRegion::ScrubRemSetClaimValue), | |
| 1928 "sanity check"); | |
| 342 | 1929 } else { |
| 1930 g1_par_scrub_rs_task.work(0); | |
| 1931 } | |
| 1932 | |
| 1933 double rs_scrub_end = os::elapsedTime(); | |
| 1934 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 1935 _total_rs_scrub_time += this_rs_scrub_time; | |
| 1936 } | |
| 1937 | |
| 1938 // this will also free any regions totally full of garbage objects, | |
| 1939 // and sort the regions. | |
|
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1940 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 1941 |
| 1942 // Statistics. | |
| 1943 double end = os::elapsedTime(); | |
| 1944 _cleanup_times.add((end - start) * 1000.0); | |
| 1945 | |
|
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1946 if (G1Log::fine()) { |
| 342 | 1947 g1h->print_size_transition(gclog_or_tty, |
| 1948 start_used_bytes, | |
| 1949 g1h->used(), | |
| 1950 g1h->capacity()); | |
| 1951 } | |
| 1952 | |
|
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1953 // Clean up will have freed any regions completely full of garbage. |
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1954 // Update the soft reference policy with the new heap occupancy. |
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1955 Universe::update_heap_info_at_gc(); |
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1956 |
| 342 | 1957 // We need to make this be a "collection" so any collection pause that |
| 1958 // races with it goes around and waits for completeCleanup to finish. | |
| 1959 g1h->increment_total_collections(); | |
| 1960 | |
|
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1961 // We reclaimed old regions so we should calculate the sizes to make |
|
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1962 // sure we update the old gen/space data. |
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1963 g1h->g1mm()->update_sizes(); |
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1964 |
| 751 | 1965 if (VerifyDuringGC) { |
|
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1966 HandleMark hm; // handle scope |
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1967 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1968 Universe::heap()->prepare_for_verify(); |
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1969 Universe::verify(/* silent */ false, |
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1970 /* option */ VerifyOption_G1UsePrevMarking); |
| 342 | 1971 } |
| 2152 | 1972 |
| 1973 g1h->verify_region_sets_optional(); | |
| 342 | 1974 } |
| 1975 | |
| 1976 void ConcurrentMark::completeCleanup() { | |
| 1977 if (has_aborted()) return; | |
| 1978 | |
| 2152 | 1979 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1980 | |
| 1981 _cleanup_list.verify_optional(); | |
| 2361 | 1982 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 1983 |
| 1984 if (G1ConcRegionFreeingVerbose) { | |
| 1985 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
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1986 "cleanup list has %u entries", |
| 2152 | 1987 _cleanup_list.length()); |
| 1988 } | |
| 1989 | |
| 1990 // Noone else should be accessing the _cleanup_list at this point, | |
| 1991 // so it's not necessary to take any locks | |
| 1992 while (!_cleanup_list.is_empty()) { | |
| 1993 HeapRegion* hr = _cleanup_list.remove_head(); | |
| 1994 assert(hr != NULL, "the list was not empty"); | |
|
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1995 hr->par_clear(); |
| 2361 | 1996 tmp_free_list.add_as_tail(hr); |
| 2152 | 1997 |
| 1998 // Instead of adding one region at a time to the secondary_free_list, | |
| 1999 // we accumulate them in the local list and move them a few at a | |
| 2000 // time. This also cuts down on the number of notify_all() calls | |
| 2001 // we do during this process. We'll also append the local list when | |
| 2002 // _cleanup_list is empty (which means we just removed the last | |
| 2003 // region from the _cleanup_list). | |
| 2361 | 2004 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 2005 _cleanup_list.is_empty()) { |
| 2006 if (G1ConcRegionFreeingVerbose) { | |
| 2007 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
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2008 "appending %u entries to the secondary_free_list, " |
|
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2009 "cleanup list still has %u entries", |
| 2361 | 2010 tmp_free_list.length(), |
| 2152 | 2011 _cleanup_list.length()); |
| 342 | 2012 } |
| 2152 | 2013 |
| 2014 { | |
| 2015 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 2361 | 2016 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
| 2152 | 2017 SecondaryFreeList_lock->notify_all(); |
| 2018 } | |
| 2019 | |
| 2020 if (G1StressConcRegionFreeing) { | |
| 2021 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 2022 os::sleep(Thread::current(), (jlong) 1, false); | |
| 2023 } | |
| 2024 } | |
| 342 | 2025 } |
| 2026 } | |
| 2361 | 2027 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 2028 } |
| 2029 | |
|
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2030 // Support closures for reference procssing in G1 |
|
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|
2031 |
|
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|
2032 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
|
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2033 HeapWord* addr = (HeapWord*)obj; |
|
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|
2034 return addr != NULL && |
|
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2035 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
|
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|
2036 } |
| 342 | 2037 |
|
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2038 class G1CMKeepAliveClosure: public ExtendedOopClosure { |
| 342 | 2039 G1CollectedHeap* _g1; |
| 2040 ConcurrentMark* _cm; | |
| 2041 public: | |
|
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2042 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
|
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2043 _g1(g1), _cm(cm) { |
|
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2044 assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
|
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|
2045 } |
| 342 | 2046 |
|
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2047 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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2048 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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2049 |
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2050 template <class T> void do_oop_work(T* p) { |
|
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2051 oop obj = oopDesc::load_decode_heap_oop(p); |
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2052 HeapWord* addr = (HeapWord*)obj; |
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2053 |
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|
2054 if (_cm->verbose_high()) { |
|
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2055 gclog_or_tty->print_cr("\t[0] we're looking at location " |
|
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2056 "*"PTR_FORMAT" = "PTR_FORMAT, |
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|
2057 p, (void*) obj); |
|
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|
2058 } |
|
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2059 |
|
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2060 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
|
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2061 _cm->mark_and_count(obj); |
|
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|
2062 _cm->mark_stack_push(obj); |
| 342 | 2063 } |
| 2064 } | |
| 2065 }; | |
| 2066 | |
| 2067 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
|
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2068 ConcurrentMark* _cm; |
| 342 | 2069 CMMarkStack* _markStack; |
| 2070 G1CMKeepAliveClosure* _oopClosure; | |
| 2071 public: | |
|
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2072 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
| 342 | 2073 G1CMKeepAliveClosure* oopClosure) : |
|
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2074 _cm(cm), |
| 342 | 2075 _markStack(markStack), |
|
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2076 _oopClosure(oopClosure) { } |
| 342 | 2077 |
| 2078 void do_void() { | |
|
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2079 _markStack->drain(_oopClosure, _cm->nextMarkBitMap(), false); |
| 342 | 2080 } |
| 2081 }; | |
| 2082 | |
|
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2083 // 'Keep Alive' closure used by parallel reference processing. |
|
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2084 // An instance of this closure is used in the parallel reference processing |
|
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|
2085 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
|
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2086 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
|
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|
2087 // placed on to discovered ref lists once so we can mark and push with no |
|
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|
2088 // need to check whether the object has already been marked. Using the |
|
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|
2089 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
|
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|
2090 // operating on the global mark stack. This means that an individual |
|
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|
2091 // worker would be doing lock-free pushes while it processes its own |
|
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|
2092 // discovered ref list followed by drain call. If the discovered ref lists |
|
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|
2093 // are unbalanced then this could cause interference with the other |
|
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|
2094 // workers. Using a CMTask (and its embedded local data structures) |
|
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|
2095 // avoids that potential interference. |
|
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|
2096 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
|
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|
2097 ConcurrentMark* _cm; |
|
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|
2098 CMTask* _task; |
|
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|
2099 int _ref_counter_limit; |
|
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|
2100 int _ref_counter; |
|
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|
2101 public: |
|
4093
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|
2102 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
|
6071e0581859
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|
2103 _cm(cm), _task(task), |
|
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|
2104 _ref_counter_limit(G1RefProcDrainInterval) { |
|
2174
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|
2105 assert(_ref_counter_limit > 0, "sanity"); |
|
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|
2106 _ref_counter = _ref_counter_limit; |
|
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|
2107 } |
|
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|
2108 |
|
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|
2109 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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|
2110 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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|
2111 |
|
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|
2112 template <class T> void do_oop_work(T* p) { |
|
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|
2113 if (!_cm->has_overflown()) { |
|
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|
2114 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
2115 if (_cm->verbose_high()) { |
|
6862
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|
2116 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
|
2174
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|
2117 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
6862
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|
2118 _task->worker_id(), p, (void*) obj); |
|
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|
2119 } |
|
2174
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|
2120 |
|
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|
2121 _task->deal_with_reference(obj); |
|
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|
2122 _ref_counter--; |
|
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|
2123 |
|
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|
2124 if (_ref_counter == 0) { |
|
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|
2125 // We have dealt with _ref_counter_limit references, pushing them and objects |
|
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changeset
|
2126 // reachable from them on to the local stack (and possibly the global stack). |
|
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|
2127 // Call do_marking_step() to process these entries. We call the routine in a |
|
234761c55641
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|
2128 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
|
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|
2129 // with the entries that we've pushed as a result of the deal_with_reference |
|
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|
2130 // calls above) or we overflow. |
|
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|
2131 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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|
2132 // while there may still be some work to do. (See the comment at the |
|
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|
2133 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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|
2134 // is reaching the specified time target.) It is only when |
|
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|
2135 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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changeset
|
2136 // that the marking has completed. |
|
234761c55641
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|
2137 do { |
|
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|
2138 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
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changeset
|
2139 _task->do_marking_step(mark_step_duration_ms, |
|
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|
2140 false /* do_stealing */, |
|
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|
2141 false /* do_termination */); |
|
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|
2142 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2143 _ref_counter = _ref_counter_limit; |
|
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|
2144 } |
|
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|
2145 } else { |
|
3776
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changeset
|
2146 if (_cm->verbose_high()) { |
|
6862
8a5ea0a9ccc4
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changeset
|
2147 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
|
3776
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|
2148 } |
|
2174
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|
2149 } |
|
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|
2150 } |
|
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|
2151 }; |
|
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|
2152 |
|
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|
2153 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
|
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|
2154 ConcurrentMark* _cm; |
|
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|
2155 CMTask* _task; |
|
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|
2156 public: |
|
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changeset
|
2157 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
|
4836
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|
2158 _cm(cm), _task(task) { } |
|
2174
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|
2159 |
|
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|
2160 void do_void() { |
|
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|
2161 do { |
|
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|
2162 if (_cm->verbose_high()) { |
|
6862
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|
2163 gclog_or_tty->print_cr("\t[%u] Drain: Calling do marking_step", |
|
8a5ea0a9ccc4
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|
2164 _task->worker_id()); |
|
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|
2165 } |
|
2174
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|
2166 |
|
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|
2167 // We call CMTask::do_marking_step() to completely drain the local and |
|
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|
2168 // global marking stacks. The routine is called in a loop, which we'll |
|
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|
2169 // exit if there's nothing more to do (i.e. we'completely drained the |
|
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|
2170 // entries that were pushed as a result of applying the |
|
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|
2171 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
|
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|
2172 // lists above) or we overflow the global marking stack. |
|
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|
2173 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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|
2174 // while there may still be some work to do. (See the comment at the |
|
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changeset
|
2175 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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changeset
|
2176 // is reaching the specified time target.) It is only when |
|
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|
2177 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2178 // that the marking has completed. |
|
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|
2179 |
|
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2180 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2181 true /* do_stealing */, |
|
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2182 true /* do_termination */); |
|
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2183 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2184 } |
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2185 }; |
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2186 |
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2187 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2188 // reference processing at the end of G1 concurrent marking |
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2189 |
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2190 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
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2191 private: |
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2192 G1CollectedHeap* _g1h; |
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2193 ConcurrentMark* _cm; |
|
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2194 WorkGang* _workers; |
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2195 int _active_workers; |
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2196 |
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2197 public: |
|
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2198 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
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2199 ConcurrentMark* cm, |
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2200 WorkGang* workers, |
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2201 int n_workers) : |
|
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2202 _g1h(g1h), _cm(cm), |
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2203 _workers(workers), _active_workers(n_workers) { } |
|
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2204 |
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2205 // Executes the given task using concurrent marking worker threads. |
|
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2206 virtual void execute(ProcessTask& task); |
|
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|
2207 virtual void execute(EnqueueTask& task); |
|
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2208 }; |
|
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2209 |
|
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2210 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
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2211 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2212 ProcessTask& _proc_task; |
|
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|
2213 G1CollectedHeap* _g1h; |
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2214 ConcurrentMark* _cm; |
|
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2215 |
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2216 public: |
|
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2217 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
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2218 G1CollectedHeap* g1h, |
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2219 ConcurrentMark* cm) : |
|
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2220 AbstractGangTask("Process reference objects in parallel"), |
|
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2221 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
|
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2222 |
|
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2223 virtual void work(uint worker_id) { |
|
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2224 CMTask* marking_task = _cm->task(worker_id); |
|
2174
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2225 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
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2226 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
|
2174
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2227 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
|
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2228 |
|
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2229 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
2174
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2230 } |
|
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2231 }; |
|
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2232 |
|
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2233 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
2174
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2234 assert(_workers != NULL, "Need parallel worker threads."); |
|
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2235 |
|
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2236 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
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2237 |
|
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2238 // We need to reset the phase for each task execution so that |
|
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2239 // the termination protocol of CMTask::do_marking_step works. |
|
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2240 _cm->set_phase(_active_workers, false /* concurrent */); |
|
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|
2241 _g1h->set_par_threads(_active_workers); |
|
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2242 _workers->run_task(&proc_task_proxy); |
|
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|
2243 _g1h->set_par_threads(0); |
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2244 } |
|
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2245 |
|
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|
2246 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
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2247 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
2248 EnqueueTask& _enq_task; |
|
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|
2249 |
|
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|
2250 public: |
|
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|
2251 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
2174
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|
2252 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
2253 _enq_task(enq_task) { } |
|
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|
2254 |
|
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|
2255 virtual void work(uint worker_id) { |
|
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|
2256 _enq_task.work(worker_id); |
|
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|
2257 } |
|
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|
2258 }; |
|
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|
2259 |
|
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|
2260 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
2261 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
2262 |
|
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|
2263 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
2264 |
|
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|
2265 _g1h->set_par_threads(_active_workers); |
|
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|
2266 _workers->run_task(&enq_task_proxy); |
|
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|
2267 _g1h->set_par_threads(0); |
|
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|
2268 } |
|
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|
2269 |
| 342 | 2270 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
| 2271 ResourceMark rm; | |
| 2272 HandleMark hm; | |
|
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|
2273 |
|
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|
2274 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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|
2275 |
|
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|
2276 // Is alive closure. |
|
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|
2277 G1CMIsAliveClosure g1_is_alive(g1h); |
|
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|
2278 |
|
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|
2279 // Inner scope to exclude the cleaning of the string and symbol |
|
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|
2280 // tables from the displayed time. |
|
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|
2281 { |
|
6007
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|
2282 if (G1Log::finer()) { |
|
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|
2283 gclog_or_tty->put(' '); |
|
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|
2284 } |
|
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|
2285 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
|
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|
2286 |
|
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|
2287 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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|
2288 |
|
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|
2289 // See the comment in G1CollectedHeap::ref_processing_init() |
|
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|
2290 // about how reference processing currently works in G1. |
|
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|
2291 |
|
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|
2292 // Process weak references. |
|
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|
2293 rp->setup_policy(clear_all_soft_refs); |
|
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|
2294 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
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|
2295 |
|
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|
2296 G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
|
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|
2297 G1CMDrainMarkingStackClosure |
|
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|
2298 g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
|
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|
2299 |
|
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|
2300 // We use the work gang from the G1CollectedHeap and we utilize all |
|
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|
2301 // the worker threads. |
|
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|
2302 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
|
6862
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|
2303 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
|
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|
2304 |
|
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|
2305 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
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|
2306 g1h->workers(), active_workers); |
|
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2307 |
|
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|
2308 if (rp->processing_is_mt()) { |
|
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|
2309 // Set the degree of MT here. If the discovery is done MT, there |
|
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2310 // may have been a different number of threads doing the discovery |
|
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2311 // and a different number of discovered lists may have Ref objects. |
|
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2312 // That is OK as long as the Reference lists are balanced (see |
|
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2313 // balance_all_queues() and balance_queues()). |
|
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2314 rp->set_active_mt_degree(active_workers); |
|
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2315 |
|
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2316 rp->process_discovered_references(&g1_is_alive, |
|
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2317 &g1_keep_alive, |
|
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2318 &g1_drain_mark_stack, |
|
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|
2319 &par_task_executor); |
|
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2320 |
|
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2321 // The work routines of the parallel keep_alive and drain_marking_stack |
|
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2322 // will set the has_overflown flag if we overflow the global marking |
|
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2323 // stack. |
|
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2324 } else { |
|
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2325 rp->process_discovered_references(&g1_is_alive, |
|
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2326 &g1_keep_alive, |
|
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|
2327 &g1_drain_mark_stack, |
|
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|
2328 NULL); |
|
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|
2329 } |
|
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|
2330 |
|
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|
2331 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
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2332 "mark stack should be empty (unless it overflowed)"); |
|
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|
2333 if (_markStack.overflow()) { |
|
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2334 // Should have been done already when we tried to push an |
|
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2335 // entry on to the global mark stack. But let's do it again. |
|
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|
2336 set_has_overflown(); |
|
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|
2337 } |
|
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|
2338 |
|
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|
2339 if (rp->processing_is_mt()) { |
|
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|
2340 assert(rp->num_q() == active_workers, "why not"); |
|
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2341 rp->enqueue_discovered_references(&par_task_executor); |
|
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|
2342 } else { |
|
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|
2343 rp->enqueue_discovered_references(); |
|
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|
2344 } |
|
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|
2345 |
|
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|
2346 rp->verify_no_references_recorded(); |
|
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|
2347 assert(!rp->discovery_enabled(), "Post condition"); |
|
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|
2348 } |
|
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|
2349 |
|
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|
2350 // Now clean up stale oops in StringTable |
|
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|
2351 StringTable::unlink(&g1_is_alive); |
|
2177
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2352 // Clean up unreferenced symbols in symbol table. |
|
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|
2353 SymbolTable::unlink(); |
| 342 | 2354 } |
| 2355 | |
| 2356 void ConcurrentMark::swapMarkBitMaps() { | |
| 2357 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2358 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2359 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2360 } | |
| 2361 | |
| 2362 class CMRemarkTask: public AbstractGangTask { | |
| 2363 private: | |
| 2364 ConcurrentMark *_cm; | |
| 2365 | |
| 2366 public: | |
|
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2367 void work(uint worker_id) { |
| 342 | 2368 // Since all available tasks are actually started, we should |
| 2369 // only proceed if we're supposed to be actived. | |
|
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2370 if (worker_id < _cm->active_tasks()) { |
|
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2371 CMTask* task = _cm->task(worker_id); |
| 342 | 2372 task->record_start_time(); |
| 2373 do { | |
|
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|
2374 task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2375 true /* do_stealing */, |
|
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|
2376 true /* do_termination */); |
| 342 | 2377 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2378 // If we overflow, then we do not want to restart. We instead | |
| 2379 // want to abort remark and do concurrent marking again. | |
| 2380 task->record_end_time(); | |
| 2381 } | |
| 2382 } | |
| 2383 | |
| 4711 | 2384 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
|
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|
2385 AbstractGangTask("Par Remark"), _cm(cm) { |
| 4711 | 2386 _cm->terminator()->reset_for_reuse(active_workers); |
|
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|
2387 } |
| 342 | 2388 }; |
| 2389 | |
| 2390 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2391 ResourceMark rm; | |
| 2392 HandleMark hm; | |
| 2393 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2394 | |
| 2395 g1h->ensure_parsability(false); | |
| 2396 | |
|
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|
2397 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2398 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
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|
2399 // this is remark, so we'll use up all active threads |
|
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2400 uint active_workers = g1h->workers()->active_workers(); |
|
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|
2401 if (active_workers == 0) { |
|
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|
2402 assert(active_workers > 0, "Should have been set earlier"); |
|
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|
2403 active_workers = (uint) ParallelGCThreads; |
|
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|
2404 g1h->workers()->set_active_workers(active_workers); |
|
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|
2405 } |
|
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|
2406 set_phase(active_workers, false /* concurrent */); |
|
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|
2407 // Leave _parallel_marking_threads at it's |
|
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|
2408 // value originally calculated in the ConcurrentMark |
|
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|
2409 // constructor and pass values of the active workers |
|
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|
2410 // through the gang in the task. |
| 342 | 2411 |
| 4711 | 2412 CMRemarkTask remarkTask(this, active_workers); |
|
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|
2413 g1h->set_par_threads(active_workers); |
| 342 | 2414 g1h->workers()->run_task(&remarkTask); |
| 2415 g1h->set_par_threads(0); | |
| 2416 } else { | |
|
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|
2417 G1CollectedHeap::StrongRootsScope srs(g1h); |
| 342 | 2418 // this is remark, so we'll use up all available threads |
|
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|
2419 uint active_workers = 1; |
|
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|
2420 set_phase(active_workers, false /* concurrent */); |
| 342 | 2421 |
| 4711 | 2422 CMRemarkTask remarkTask(this, active_workers); |
| 342 | 2423 // We will start all available threads, even if we decide that the |
| 2424 // active_workers will be fewer. The extra ones will just bail out | |
| 2425 // immediately. | |
| 2426 remarkTask.work(0); | |
| 2427 } | |
|
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|
2428 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
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|
2429 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2430 |
| 2431 print_stats(); | |
| 2432 | |
| 2433 #if VERIFY_OBJS_PROCESSED | |
| 2434 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
| 2435 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
| 2436 _scan_obj_cl.objs_processed, | |
| 2437 ThreadLocalObjQueue::objs_enqueued); | |
| 2438 guarantee(_scan_obj_cl.objs_processed == | |
| 2439 ThreadLocalObjQueue::objs_enqueued, | |
| 2440 "Different number of objs processed and enqueued."); | |
| 2441 } | |
| 2442 #endif | |
| 2443 } | |
| 2444 | |
| 1044 | 2445 #ifndef PRODUCT |
| 2446 | |
| 1388 | 2447 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2448 private: |
| 2449 G1CollectedHeap* _g1h; | |
| 2450 outputStream* _out; | |
|
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|
2451 VerifyOption _vo; |
| 1388 | 2452 bool _all; |
| 342 | 2453 |
| 2454 public: | |
|
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|
2455 PrintReachableOopClosure(outputStream* out, |
|
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|
2456 VerifyOption vo, |
| 1388 | 2457 bool all) : |
| 1044 | 2458 _g1h(G1CollectedHeap::heap()), |
|
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|
2459 _out(out), _vo(vo), _all(all) { } |
| 342 | 2460 |
|
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|
2461 void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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|
2462 void do_oop( oop* p) { do_oop_work(p); } |
|
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|
2463 |
|
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|
2464 template <class T> void do_oop_work(T* p) { |
|
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|
2465 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2466 const char* str = NULL; |
| 2467 const char* str2 = ""; | |
| 2468 | |
| 1388 | 2469 if (obj == NULL) { |
| 2470 str = ""; | |
| 2471 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2472 str = " O"; | |
| 2473 } else { | |
| 342 | 2474 HeapRegion* hr = _g1h->heap_region_containing(obj); |
|
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|
2475 guarantee(hr != NULL, "invariant"); |
|
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|
2476 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
|
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|
2477 bool marked = _g1h->is_marked(obj, _vo); |
| 1044 | 2478 |
| 2479 if (over_tams) { | |
| 1388 | 2480 str = " >"; |
| 2481 if (marked) { | |
| 342 | 2482 str2 = " AND MARKED"; |
| 1044 | 2483 } |
| 1388 | 2484 } else if (marked) { |
| 2485 str = " M"; | |
| 1044 | 2486 } else { |
| 1388 | 2487 str = " NOT"; |
| 1044 | 2488 } |
| 342 | 2489 } |
| 2490 | |
| 1388 | 2491 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
| 342 | 2492 p, (void*) obj, str, str2); |
| 2493 } | |
| 2494 }; | |
| 2495 | |
| 1388 | 2496 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2497 private: |
|
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|
2498 G1CollectedHeap* _g1h; |
|
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|
2499 outputStream* _out; |
|
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|
2500 VerifyOption _vo; |
|
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|
2501 bool _all; |
|
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|
2502 HeapRegion* _hr; |
| 342 | 2503 |
| 2504 public: | |
|
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|
2505 PrintReachableObjectClosure(outputStream* out, |
|
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|
2506 VerifyOption vo, |
| 1388 | 2507 bool all, |
| 2508 HeapRegion* hr) : | |
|
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|
2509 _g1h(G1CollectedHeap::heap()), |
|
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|
2510 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2511 |
| 2512 void do_object(oop o) { | |
|
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2513 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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2514 bool marked = _g1h->is_marked(o, _vo); |
| 1388 | 2515 bool print_it = _all || over_tams || marked; |
| 2516 | |
| 2517 if (print_it) { | |
| 2518 _out->print_cr(" "PTR_FORMAT"%s", | |
| 2519 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
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2520 PrintReachableOopClosure oopCl(_out, _vo, _all); |
|
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2521 o->oop_iterate_no_header(&oopCl); |
| 1388 | 2522 } |
| 342 | 2523 } |
| 2524 }; | |
| 2525 | |
| 1388 | 2526 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2527 private: |
|
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2528 G1CollectedHeap* _g1h; |
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2529 outputStream* _out; |
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2530 VerifyOption _vo; |
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2531 bool _all; |
| 342 | 2532 |
| 2533 public: | |
| 2534 bool doHeapRegion(HeapRegion* hr) { | |
| 2535 HeapWord* b = hr->bottom(); | |
| 2536 HeapWord* e = hr->end(); | |
| 2537 HeapWord* t = hr->top(); | |
|
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2538 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
| 342 | 2539 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
| 1044 | 2540 "TAMS: "PTR_FORMAT, b, e, t, p); |
| 1388 | 2541 _out->cr(); |
| 2542 | |
| 2543 HeapWord* from = b; | |
| 2544 HeapWord* to = t; | |
| 2545 | |
| 2546 if (to > from) { | |
| 2547 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
| 2548 _out->cr(); | |
|
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2549 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2550 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2551 _out->cr(); | |
| 2552 } | |
| 342 | 2553 |
| 2554 return false; | |
| 2555 } | |
| 2556 | |
|
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2557 PrintReachableRegionClosure(outputStream* out, |
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2558 VerifyOption vo, |
| 1388 | 2559 bool all) : |
|
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2560 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
| 342 | 2561 }; |
| 2562 | |
| 1388 | 2563 void ConcurrentMark::print_reachable(const char* str, |
|
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2564 VerifyOption vo, |
| 1388 | 2565 bool all) { |
| 2566 gclog_or_tty->cr(); | |
| 2567 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 2568 |
| 2569 if (G1PrintReachableBaseFile == NULL) { | |
| 2570 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 2571 return; | |
| 2572 } | |
| 2573 | |
| 2574 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 2575 (JVM_MAXPATHLEN - 1)) { | |
| 2576 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 2577 return; | |
| 2578 } | |
| 2579 | |
| 2580 char file_name[JVM_MAXPATHLEN]; | |
| 2581 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 2582 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 2583 | |
| 2584 fileStream fout(file_name); | |
| 2585 if (!fout.is_open()) { | |
| 2586 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 2587 return; | |
| 2588 } | |
| 2589 | |
| 2590 outputStream* out = &fout; | |
|
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2591 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
| 1044 | 2592 out->cr(); |
| 2593 | |
| 1388 | 2594 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2595 out->cr(); |
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2596 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 2597 _g1h->heap_region_iterate(&rcl); |
| 1044 | 2598 out->cr(); |
| 2599 | |
| 2600 gclog_or_tty->print_cr(" done"); | |
| 1388 | 2601 gclog_or_tty->flush(); |
| 342 | 2602 } |
| 2603 | |
| 1044 | 2604 #endif // PRODUCT |
| 2605 | |
|
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2606 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 2607 // Note we are overriding the read-only view of the prev map here, via |
| 2608 // the cast. | |
| 2609 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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2610 } |
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2611 |
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2612 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 2613 _nextMarkBitMap->clearRange(mr); |
| 2614 } | |
| 2615 | |
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2616 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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2617 clearRangePrevBitmap(mr); |
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2618 clearRangeNextBitmap(mr); |
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2619 } |
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2620 |
| 342 | 2621 HeapRegion* |
|
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2622 ConcurrentMark::claim_region(uint worker_id) { |
| 342 | 2623 // "checkpoint" the finger |
| 2624 HeapWord* finger = _finger; | |
| 2625 | |
| 2626 // _heap_end will not change underneath our feet; it only changes at | |
| 2627 // yield points. | |
| 2628 while (finger < _heap_end) { | |
|
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2629 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 2630 |
| 3771 | 2631 // Note on how this code handles humongous regions. In the |
| 2632 // normal case the finger will reach the start of a "starts | |
| 2633 // humongous" (SH) region. Its end will either be the end of the | |
| 2634 // last "continues humongous" (CH) region in the sequence, or the | |
| 2635 // standard end of the SH region (if the SH is the only region in | |
| 2636 // the sequence). That way claim_region() will skip over the CH | |
| 2637 // regions. However, there is a subtle race between a CM thread | |
| 2638 // executing this method and a mutator thread doing a humongous | |
| 2639 // object allocation. The two are not mutually exclusive as the CM | |
| 2640 // thread does not need to hold the Heap_lock when it gets | |
| 2641 // here. So there is a chance that claim_region() will come across | |
| 2642 // a free region that's in the progress of becoming a SH or a CH | |
| 2643 // region. In the former case, it will either | |
| 2644 // a) Miss the update to the region's end, in which case it will | |
| 2645 // visit every subsequent CH region, will find their bitmaps | |
| 2646 // empty, and do nothing, or | |
| 2647 // b) Will observe the update of the region's end (in which case | |
| 2648 // it will skip the subsequent CH regions). | |
| 2649 // If it comes across a region that suddenly becomes CH, the | |
| 2650 // scenario will be similar to b). So, the race between | |
| 2651 // claim_region() and a humongous object allocation might force us | |
| 2652 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 2653 // iterations) but it should not introduce and correctness issues. | |
| 2654 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
| 342 | 2655 HeapWord* bottom = curr_region->bottom(); |
| 2656 HeapWord* end = curr_region->end(); | |
| 2657 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 2658 | |
| 3771 | 2659 if (verbose_low()) { |
|
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2660 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " |
| 342 | 2661 "["PTR_FORMAT", "PTR_FORMAT"), " |
| 2662 "limit = "PTR_FORMAT, | |
|
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2663 worker_id, curr_region, bottom, end, limit); |
| 3771 | 2664 } |
| 2665 | |
| 2666 // Is the gap between reading the finger and doing the CAS too long? | |
| 2667 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 342 | 2668 if (res == finger) { |
| 2669 // we succeeded | |
| 2670 | |
| 2671 // notice that _finger == end cannot be guaranteed here since, | |
| 2672 // someone else might have moved the finger even further | |
|
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2673 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 2674 |
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2675 if (verbose_low()) { |
|
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2676 gclog_or_tty->print_cr("[%u] we were successful with region = " |
|
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2677 PTR_FORMAT, worker_id, curr_region); |
|
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2678 } |
| 342 | 2679 |
| 2680 if (limit > bottom) { | |
|
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|
2681 if (verbose_low()) { |
|
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|
2682 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
|
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2683 "returning it ", worker_id, curr_region); |
|
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2684 } |
| 342 | 2685 return curr_region; |
| 2686 } else { | |
|
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2687 assert(limit == bottom, |
|
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|
2688 "the region limit should be at bottom"); |
|
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|
2689 if (verbose_low()) { |
|
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2690 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
|
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2691 "returning NULL", worker_id, curr_region); |
|
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|
2692 } |
| 342 | 2693 // we return NULL and the caller should try calling |
| 2694 // claim_region() again. | |
| 2695 return NULL; | |
| 2696 } | |
| 2697 } else { | |
|
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2698 assert(_finger > finger, "the finger should have moved forward"); |
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|
2699 if (verbose_low()) { |
|
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2700 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " |
| 342 | 2701 "global finger = "PTR_FORMAT", " |
| 2702 "our finger = "PTR_FORMAT, | |
|
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2703 worker_id, _finger, finger); |
|
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2704 } |
| 342 | 2705 |
| 2706 // read it again | |
| 2707 finger = _finger; | |
| 2708 } | |
| 2709 } | |
| 2710 | |
| 2711 return NULL; | |
| 2712 } | |
| 2713 | |
|
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2714 #ifndef PRODUCT |
|
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2715 enum VerifyNoCSetOopsPhase { |
|
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2716 VerifyNoCSetOopsStack, |
|
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2717 VerifyNoCSetOopsQueues, |
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2718 VerifyNoCSetOopsSATBCompleted, |
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2719 VerifyNoCSetOopsSATBThread |
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2720 }; |
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2721 |
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2722 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2723 private: |
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2724 G1CollectedHeap* _g1h; |
|
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2725 VerifyNoCSetOopsPhase _phase; |
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2726 int _info; |
|
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2727 |
|
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2728 const char* phase_str() { |
|
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2729 switch (_phase) { |
|
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2730 case VerifyNoCSetOopsStack: return "Stack"; |
|
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2731 case VerifyNoCSetOopsQueues: return "Queue"; |
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2732 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
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2733 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
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2734 default: ShouldNotReachHere(); |
|
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2735 } |
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2736 return NULL; |
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2737 } |
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2738 |
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2739 void do_object_work(oop obj) { |
|
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2740 guarantee(!_g1h->obj_in_cs(obj), |
|
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2741 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
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2742 (void*) obj, phase_str(), _info)); |
|
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2743 } |
|
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2744 |
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2745 public: |
|
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2746 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
|
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2747 |
|
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|
2748 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
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|
2749 _phase = phase; |
|
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|
2750 _info = info; |
|
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|
2751 } |
|
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|
2752 |
|
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|
2753 virtual void do_oop(oop* p) { |
|
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|
2754 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2755 do_object_work(obj); |
|
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|
2756 } |
|
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|
2757 |
|
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|
2758 virtual void do_oop(narrowOop* p) { |
|
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2759 // We should not come across narrow oops while scanning marking |
|
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2760 // stacks and SATB buffers. |
|
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|
2761 ShouldNotReachHere(); |
|
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|
2762 } |
|
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|
2763 |
|
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|
2764 virtual void do_object(oop obj) { |
|
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|
2765 do_object_work(obj); |
|
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|
2766 } |
|
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|
2767 }; |
|
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|
2768 |
|
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|
2769 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
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|
2770 bool verify_enqueued_buffers, |
|
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2771 bool verify_thread_buffers, |
|
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|
2772 bool verify_fingers) { |
|
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|
2773 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
|
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|
2774 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
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|
2775 return; |
| 342 | 2776 } |
|
1835
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|
2777 |
|
4787
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|
2778 VerifyNoCSetOopsClosure cl; |
|
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|
2779 |
|
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|
2780 if (verify_stacks) { |
|
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|
2781 // Verify entries on the global mark stack |
|
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|
2782 cl.set_phase(VerifyNoCSetOopsStack); |
|
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|
2783 _markStack.oops_do(&cl); |
|
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|
2784 |
|
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|
2785 // Verify entries on the task queues |
|
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|
2786 for (uint i = 0; i < _max_worker_id; i += 1) { |
|
4787
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|
2787 cl.set_phase(VerifyNoCSetOopsQueues, i); |
|
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|
2788 OopTaskQueue* queue = _task_queues->queue(i); |
|
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|
2789 queue->oops_do(&cl); |
|
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|
2790 } |
|
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|
2791 } |
|
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|
2792 |
|
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|
2793 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
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|
2794 |
|
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|
2795 // Verify entries on the enqueued SATB buffers |
|
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|
2796 if (verify_enqueued_buffers) { |
|
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|
2797 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
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|
2798 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
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|
2799 } |
|
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|
2800 |
|
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|
2801 // Verify entries on the per-thread SATB buffers |
|
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|
2802 if (verify_thread_buffers) { |
|
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|
2803 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
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|
2804 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
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|
2805 } |
|
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|
2806 |
|
4787
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|
2807 if (verify_fingers) { |
|
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|
2808 // Verify the global finger |
|
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|
2809 HeapWord* global_finger = finger(); |
|
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|
2810 if (global_finger != NULL && global_finger < _heap_end) { |
|
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|
2811 // The global finger always points to a heap region boundary. We |
|
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|
2812 // use heap_region_containing_raw() to get the containing region |
|
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|
2813 // given that the global finger could be pointing to a free region |
|
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|
2814 // which subsequently becomes continues humongous. If that |
|
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|
2815 // happens, heap_region_containing() will return the bottom of the |
|
2ace1c4ee8da
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|
2816 // corresponding starts humongous region and the check below will |
|
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|
2817 // not hold any more. |
|
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|
2818 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
|
2ace1c4ee8da
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|
2819 guarantee(global_finger == global_hr->bottom(), |
|
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|
2820 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
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|
2821 global_finger, HR_FORMAT_PARAMS(global_hr))); |
|
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|
2822 } |
|
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|
2823 |
|
2ace1c4ee8da
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|
2824 // Verify the task fingers |
|
6862
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|
2825 assert(parallel_marking_threads() <= _max_worker_id, "sanity"); |
|
4787
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|
2826 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
|
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|
2827 CMTask* task = _tasks[i]; |
|
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|
2828 HeapWord* task_finger = task->finger(); |
|
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|
2829 if (task_finger != NULL && task_finger < _heap_end) { |
|
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|
2830 // See above note on the global finger verification. |
|
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|
2831 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
|
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|
2832 guarantee(task_finger == task_hr->bottom() || |
|
2ace1c4ee8da
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|
2833 !task_hr->in_collection_set(), |
|
2ace1c4ee8da
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changeset
|
2834 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
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|
2835 task_finger, HR_FORMAT_PARAMS(task_hr))); |
|
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|
2836 } |
|
2ace1c4ee8da
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|
2837 } |
|
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|
2838 } |
| 342 | 2839 } |
|
4787
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|
2840 #endif // PRODUCT |
| 342 | 2841 |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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diff
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|
2842 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
| 342 | 2843 _markStack.setEmpty(); |
| 2844 _markStack.clear_overflow(); | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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2436
diff
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|
2845 if (clear_overflow) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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2436
diff
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|
2846 clear_has_overflown(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
2847 } else { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
2848 assert(has_overflown(), "pre-condition"); |
|
cd8e33b2a8ad
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|
2849 } |
| 342 | 2850 _finger = _heap_start; |
| 2851 | |
|
6862
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|
2852 for (uint i = 0; i < _max_worker_id; ++i) { |
| 342 | 2853 OopTaskQueue* queue = _task_queues->queue(i); |
| 2854 queue->set_empty(); | |
| 2855 } | |
| 2856 } | |
| 2857 | |
|
4836
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|
2858 // Aggregate the counting data that was constructed concurrently |
|
d30fa85f9994
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diff
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|
2859 // with marking. |
|
d30fa85f9994
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changeset
|
2860 class AggregateCountDataHRClosure: public HeapRegionClosure { |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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6750
diff
changeset
|
2861 G1CollectedHeap* _g1h; |
|
4836
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|
2862 ConcurrentMark* _cm; |
|
6812
988bf00cc564
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6750
diff
changeset
|
2863 CardTableModRefBS* _ct_bs; |
|
4836
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|
2864 BitMap* _cm_card_bm; |
|
6862
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|
2865 uint _max_worker_id; |
|
4836
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|
2866 |
|
d30fa85f9994
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diff
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|
2867 public: |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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parents:
6750
diff
changeset
|
2868 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
|
4836
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|
2869 BitMap* cm_card_bm, |
|
6862
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diff
changeset
|
2870 uint max_worker_id) : |
|
6812
988bf00cc564
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6750
diff
changeset
|
2871 _g1h(g1h), _cm(g1h->concurrent_mark()), |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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6750
diff
changeset
|
2872 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
|
6862
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diff
changeset
|
2873 _cm_card_bm(cm_card_bm), _max_worker_id(max_worker_id) { } |
|
4836
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|
2874 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2875 bool doHeapRegion(HeapRegion* hr) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2876 if (hr->continuesHumongous()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2877 // We will ignore these here and process them when their |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2878 // associated "starts humongous" region is processed. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2879 // Note that we cannot rely on their associated |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2880 // "starts humongous" region to have their bit set to 1 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2881 // 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
|
2882 // iteration, a "continues humongous" region might be visited |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2883 // before its associated "starts humongous". |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2884 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2885 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2886 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2887 HeapWord* start = hr->bottom(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2888 HeapWord* limit = hr->next_top_at_mark_start(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2889 HeapWord* end = hr->end(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2890 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2891 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
|
2892 err_msg("Preconditions not met - " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2893 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2894 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2895 start, limit, hr->top(), hr->end())); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2896 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2897 assert(hr->next_marked_bytes() == 0, "Precondition"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2898 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2899 if (start == limit) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2900 // 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
|
2901 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2902 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2903 |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2904 // 'start' should be in the heap. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2905 assert(_g1h->is_in_g1_reserved(start) && _ct_bs->is_card_aligned(start), "sanity"); |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2906 // 'end' *may* be just beyone the end of the heap (if hr is the last region) |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2907 assert(!_g1h->is_in_g1_reserved(end) || _ct_bs->is_card_aligned(end), "sanity"); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2908 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2909 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
|
2910 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
|
2911 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
|
2912 |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2913 // If ntams is not card aligned then we bump card bitmap index |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2914 // for limit so that we get the all the cards spanned by |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2915 // the object ending at ntams. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2916 // Note: if this is the last region in the heap then ntams |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2917 // could be actually just beyond the end of the the heap; |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2918 // limit_idx will then correspond to a (non-existent) card |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2919 // that is also outside the heap. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2920 if (_g1h->is_in_g1_reserved(limit) && !_ct_bs->is_card_aligned(limit)) { |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2921 limit_idx += 1; |
|
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 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2924 assert(limit_idx <= end_idx, "or else use atomics"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2925 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2926 // 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
|
2927 uint hrs_index = hr->hrs_index(); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2928 size_t marked_bytes = 0; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2929 |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2930 for (uint i = 0; i < _max_worker_id; i += 1) { |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2931 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
|
2932 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
|
2933 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2934 // 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
|
2935 // add it to the running total for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2936 marked_bytes += marked_bytes_array[hrs_index]; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2937 |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2938 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2939 // into the global card bitmap. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2940 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
|
2941 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2942 while (scan_idx < limit_idx) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2943 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
|
2944 _cm_card_bm->set_bit(scan_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2945 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
|
2946 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2947 // 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
|
2948 // its left_offset parameter is greater than its right_offset |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
2949 // parameter. It does, however, have an early exit if |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2950 // 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
|
2951 // passed in for left offset here. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2952 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
|
2953 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
|
2954 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2955 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2956 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2957 // Update the marked bytes for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2958 hr->add_to_marked_bytes(marked_bytes); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2959 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2960 // Next heap region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2961 return false; |
|
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 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2964 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2965 class G1AggregateCountDataTask: public AbstractGangTask { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2966 protected: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2967 G1CollectedHeap* _g1h; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2968 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2969 BitMap* _cm_card_bm; |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2970 uint _max_worker_id; |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2971 int _active_workers; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2972 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2973 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2974 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2975 ConcurrentMark* cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2976 BitMap* cm_card_bm, |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2977 uint max_worker_id, |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2978 int n_workers) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2979 AbstractGangTask("Count Aggregation"), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2980 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2981 _max_worker_id(max_worker_id), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2982 _active_workers(n_workers) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2983 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2984 void work(uint worker_id) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2985 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2986 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2987 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2988 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2989 _active_workers, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2990 HeapRegion::AggregateCountClaimValue); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2991 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2992 _g1h->heap_region_iterate(&cl); |
|
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|
2993 } |
|
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|
2994 } |
|
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|
2995 }; |
|
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|
2996 |
|
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|
2997 |
|
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|
2998 void ConcurrentMark::aggregate_count_data() { |
|
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2999 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
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|
3000 _g1h->workers()->active_workers() : |
|
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|
3001 1); |
|
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|
3002 |
|
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|
3003 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
|
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3004 _max_worker_id, n_workers); |
|
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3005 |
|
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|
3006 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
3007 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
|
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|
3008 "sanity check"); |
|
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|
3009 _g1h->set_par_threads(n_workers); |
|
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|
3010 _g1h->workers()->run_task(&g1_par_agg_task); |
|
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|
3011 _g1h->set_par_threads(0); |
|
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|
3012 |
|
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|
3013 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
|
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|
3014 "sanity check"); |
|
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|
3015 _g1h->reset_heap_region_claim_values(); |
|
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3016 } else { |
|
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|
3017 g1_par_agg_task.work(0); |
|
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|
3018 } |
|
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|
3019 } |
|
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|
3020 |
|
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3021 // Clear the per-worker arrays used to store the per-region counting data |
|
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3022 void ConcurrentMark::clear_all_count_data() { |
|
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3023 // Clear the global card bitmap - it will be filled during |
|
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3024 // liveness count aggregation (during remark) and the |
|
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3025 // final counting task. |
|
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|
3026 _card_bm.clear(); |
|
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|
3027 |
|
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|
3028 // Clear the global region bitmap - it will be filled as part |
|
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|
3029 // of the final counting task. |
|
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|
3030 _region_bm.clear(); |
|
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3031 |
|
6010
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|
3032 uint max_regions = _g1h->max_regions(); |
|
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|
3033 assert(_max_worker_id > 0, "uninitialized"); |
|
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3034 |
|
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|
3035 for (uint i = 0; i < _max_worker_id; i += 1) { |
|
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3036 BitMap* task_card_bm = count_card_bitmap_for(i); |
|
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3037 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
|
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3038 |
|
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|
3039 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
|
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|
3040 assert(marked_bytes_array != NULL, "uninitialized"); |
|
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3041 |
|
6010
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|
3042 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
|
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|
3043 task_card_bm->clear(); |
|
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|
3044 } |
|
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|
3045 } |
|
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|
3046 |
| 342 | 3047 void ConcurrentMark::print_stats() { |
| 3048 if (verbose_stats()) { | |
| 3049 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3050 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3051 _tasks[i]->print_stats(); | |
| 3052 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3053 } | |
| 3054 } | |
| 3055 } | |
| 3056 | |
| 3057 // abandon current marking iteration due to a Full GC | |
| 3058 void ConcurrentMark::abort() { | |
| 3059 // Clear all marks to force marking thread to do nothing | |
| 3060 _nextMarkBitMap->clearAll(); | |
|
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|
3061 // Clear the liveness counting data |
|
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|
3062 clear_all_count_data(); |
| 342 | 3063 // Empty mark stack |
| 3064 clear_marking_state(); | |
|
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|
3065 for (uint i = 0; i < _max_worker_id; ++i) { |
| 342 | 3066 _tasks[i]->clear_region_fields(); |
|
1835
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|
3067 } |
| 342 | 3068 _has_aborted = true; |
| 3069 | |
| 3070 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3071 satb_mq_set.abandon_partial_marking(); | |
|
1317
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|
3072 // This can be called either during or outside marking, we'll read |
|
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|
3073 // the expected_active value from the SATB queue set. |
|
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|
3074 satb_mq_set.set_active_all_threads( |
|
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|
3075 false, /* new active value */ |
|
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|
3076 satb_mq_set.is_active() /* expected_active */); |
| 342 | 3077 } |
| 3078 | |
| 3079 static void print_ms_time_info(const char* prefix, const char* name, | |
| 3080 NumberSeq& ns) { | |
| 3081 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3082 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3083 if (ns.num() > 0) { | |
| 3084 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3085 prefix, ns.sd(), ns.maximum()); | |
| 3086 } | |
| 3087 } | |
| 3088 | |
| 3089 void ConcurrentMark::print_summary_info() { | |
| 3090 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3091 print_ms_time_info(" ", "init marks", _init_times); | |
| 3092 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3093 { | |
| 3094 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3095 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3096 | |
| 3097 } | |
| 3098 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3099 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3100 _total_counting_time, | |
| 3101 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3102 (double)_cleanup_times.num() | |
| 3103 : 0.0)); | |
| 3104 if (G1ScrubRemSets) { | |
| 3105 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3106 _total_rs_scrub_time, | |
| 3107 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3108 (double)_cleanup_times.num() | |
| 3109 : 0.0)); | |
| 3110 } | |
| 3111 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3112 (_init_times.sum() + _remark_times.sum() + | |
| 3113 _cleanup_times.sum())/1000.0); | |
| 3114 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
|
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|
3115 "(%8.2f s marking).", |
| 342 | 3116 cmThread()->vtime_accum(), |
|
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|
3117 cmThread()->vtime_mark_accum()); |
| 342 | 3118 } |
| 3119 | |
| 1019 | 3120 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
| 3121 _parallel_workers->print_worker_threads_on(st); | |
| 3122 } | |
| 3123 | |
| 342 | 3124 // We take a break if someone is trying to stop the world. |
|
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|
3125 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 342 | 3126 if (should_yield()) { |
|
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|
3127 if (worker_id == 0) { |
| 342 | 3128 _g1h->g1_policy()->record_concurrent_pause(); |
|
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|
3129 } |
| 342 | 3130 cmThread()->yield(); |
| 3131 return true; | |
| 3132 } else { | |
| 3133 return false; | |
| 3134 } | |
| 3135 } | |
| 3136 | |
| 3137 bool ConcurrentMark::should_yield() { | |
| 3138 return cmThread()->should_yield(); | |
| 3139 } | |
| 3140 | |
| 3141 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 3142 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 3143 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 3144 } | |
| 3145 | |
| 3146 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 3147 void* last) { | |
|
3776
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|
3148 return containing_card_is_marked(start) && |
|
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|
3149 containing_card_is_marked(last); |
| 342 | 3150 } |
| 3151 | |
| 3152 #ifndef PRODUCT | |
| 3153 // for debugging purposes | |
| 3154 void ConcurrentMark::print_finger() { | |
| 3155 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
| 3156 _heap_start, _heap_end, _finger); | |
|
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|
3157 for (uint i = 0; i < _max_worker_id; ++i) { |
|
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|
3158 gclog_or_tty->print(" %u: "PTR_FORMAT, i, _tasks[i]->finger()); |
| 342 | 3159 } |
| 3160 gclog_or_tty->print_cr(""); | |
| 3161 } | |
| 3162 #endif | |
| 3163 | |
| 3771 | 3164 void CMTask::scan_object(oop obj) { |
| 3165 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3166 | |
| 3167 if (_cm->verbose_high()) { | |
|
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|
3168 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
|
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|
3169 _worker_id, (void*) obj); |
| 3771 | 3170 } |
| 3171 | |
| 3172 size_t obj_size = obj->size(); | |
| 3173 _words_scanned += obj_size; | |
| 3174 | |
| 3175 obj->oop_iterate(_cm_oop_closure); | |
| 3176 statsOnly( ++_objs_scanned ); | |
| 3177 check_limits(); | |
| 3178 } | |
| 3179 | |
| 342 | 3180 // Closure for iteration over bitmaps |
| 3181 class CMBitMapClosure : public BitMapClosure { | |
| 3182 private: | |
| 3183 // the bitmap that is being iterated over | |
| 3184 CMBitMap* _nextMarkBitMap; | |
| 3185 ConcurrentMark* _cm; | |
| 3186 CMTask* _task; | |
| 3187 | |
| 3188 public: | |
|
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|
3189 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
|
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|
3190 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
| 342 | 3191 |
| 3192 bool do_bit(size_t offset) { | |
| 3193 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
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|
3194 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
|
11d4857fe5e1
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diff
changeset
|
3195 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3196 |
|
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|
3197 statsOnly( _task->increase_objs_found_on_bitmap() ); |
|
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|
3198 assert(addr >= _task->finger(), "invariant"); |
|
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|
3199 |
|
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|
3200 // We move that task's local finger along. |
|
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|
3201 _task->move_finger_to(addr); |
| 342 | 3202 |
| 3203 _task->scan_object(oop(addr)); | |
| 3204 // we only partially drain the local queue and global stack | |
| 3205 _task->drain_local_queue(true); | |
| 3206 _task->drain_global_stack(true); | |
| 3207 | |
| 3208 // if the has_aborted flag has been raised, we need to bail out of | |
| 3209 // the iteration | |
| 3210 return !_task->has_aborted(); | |
| 3211 } | |
| 3212 }; | |
| 3213 | |
| 3214 // Closure for iterating over objects, currently only used for | |
| 3215 // processing SATB buffers. | |
| 3216 class CMObjectClosure : public ObjectClosure { | |
| 3217 private: | |
| 3218 CMTask* _task; | |
| 3219 | |
| 3220 public: | |
| 3221 void do_object(oop obj) { | |
| 3222 _task->deal_with_reference(obj); | |
| 3223 } | |
| 3224 | |
| 3225 CMObjectClosure(CMTask* task) : _task(task) { } | |
| 3226 }; | |
| 3227 | |
| 3771 | 3228 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 3229 ConcurrentMark* cm, | |
| 3230 CMTask* task) | |
| 3231 : _g1h(g1h), _cm(cm), _task(task) { | |
| 3232 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 3233 | |
| 3234 if (G1UseConcMarkReferenceProcessing) { | |
|
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3235 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 3236 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 3237 } |
| 3771 | 3238 } |
| 342 | 3239 |
| 3240 void CMTask::setup_for_region(HeapRegion* hr) { | |
|
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3241 // Separated the asserts so that we know which one fires. |
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3242 assert(hr != NULL, |
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3243 "claim_region() should have filtered out continues humongous regions"); |
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3244 assert(!hr->continuesHumongous(), |
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3245 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 3246 |
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3247 if (_cm->verbose_low()) { |
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3248 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3249 _worker_id, hr); |
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3250 } |
| 342 | 3251 |
| 3252 _curr_region = hr; | |
| 3253 _finger = hr->bottom(); | |
| 3254 update_region_limit(); | |
| 3255 } | |
| 3256 | |
| 3257 void CMTask::update_region_limit() { | |
| 3258 HeapRegion* hr = _curr_region; | |
| 3259 HeapWord* bottom = hr->bottom(); | |
| 3260 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 3261 | |
| 3262 if (limit == bottom) { | |
|
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3263 if (_cm->verbose_low()) { |
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3264 gclog_or_tty->print_cr("[%u] found an empty region " |
| 342 | 3265 "["PTR_FORMAT", "PTR_FORMAT")", |
|
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3266 _worker_id, bottom, limit); |
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3267 } |
| 342 | 3268 // The region was collected underneath our feet. |
| 3269 // We set the finger to bottom to ensure that the bitmap | |
| 3270 // iteration that will follow this will not do anything. | |
| 3271 // (this is not a condition that holds when we set the region up, | |
| 3272 // as the region is not supposed to be empty in the first place) | |
| 3273 _finger = bottom; | |
| 3274 } else if (limit >= _region_limit) { | |
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3275 assert(limit >= _finger, "peace of mind"); |
| 342 | 3276 } else { |
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3277 assert(limit < _region_limit, "only way to get here"); |
| 342 | 3278 // This can happen under some pretty unusual circumstances. An |
| 3279 // evacuation pause empties the region underneath our feet (NTAMS | |
| 3280 // at bottom). We then do some allocation in the region (NTAMS | |
| 3281 // stays at bottom), followed by the region being used as a GC | |
| 3282 // alloc region (NTAMS will move to top() and the objects | |
| 3283 // originally below it will be grayed). All objects now marked in | |
| 3284 // the region are explicitly grayed, if below the global finger, | |
| 3285 // and we do not need in fact to scan anything else. So, we simply | |
| 3286 // set _finger to be limit to ensure that the bitmap iteration | |
| 3287 // doesn't do anything. | |
| 3288 _finger = limit; | |
| 3289 } | |
| 3290 | |
| 3291 _region_limit = limit; | |
| 3292 } | |
| 3293 | |
| 3294 void CMTask::giveup_current_region() { | |
|
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3295 assert(_curr_region != NULL, "invariant"); |
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3296 if (_cm->verbose_low()) { |
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3297 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3298 _worker_id, _curr_region); |
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3299 } |
| 342 | 3300 clear_region_fields(); |
| 3301 } | |
| 3302 | |
| 3303 void CMTask::clear_region_fields() { | |
| 3304 // Values for these three fields that indicate that we're not | |
| 3305 // holding on to a region. | |
| 3306 _curr_region = NULL; | |
| 3307 _finger = NULL; | |
| 3308 _region_limit = NULL; | |
| 3309 } | |
| 3310 | |
| 3771 | 3311 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 3312 if (cm_oop_closure == NULL) { | |
| 3313 assert(_cm_oop_closure != NULL, "invariant"); | |
| 3314 } else { | |
| 3315 assert(_cm_oop_closure == NULL, "invariant"); | |
| 3316 } | |
| 3317 _cm_oop_closure = cm_oop_closure; | |
| 3318 } | |
| 3319 | |
| 342 | 3320 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
|
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3321 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 3322 |
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3323 if (_cm->verbose_low()) { |
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3324 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3325 } |
| 342 | 3326 |
| 3327 _nextMarkBitMap = nextMarkBitMap; | |
| 3328 clear_region_fields(); | |
| 3329 | |
| 3330 _calls = 0; | |
| 3331 _elapsed_time_ms = 0.0; | |
| 3332 _termination_time_ms = 0.0; | |
| 3333 _termination_start_time_ms = 0.0; | |
| 3334 | |
| 3335 #if _MARKING_STATS_ | |
| 3336 _local_pushes = 0; | |
| 3337 _local_pops = 0; | |
| 3338 _local_max_size = 0; | |
| 3339 _objs_scanned = 0; | |
| 3340 _global_pushes = 0; | |
| 3341 _global_pops = 0; | |
| 3342 _global_max_size = 0; | |
| 3343 _global_transfers_to = 0; | |
| 3344 _global_transfers_from = 0; | |
| 3345 _regions_claimed = 0; | |
| 3346 _objs_found_on_bitmap = 0; | |
| 3347 _satb_buffers_processed = 0; | |
| 3348 _steal_attempts = 0; | |
| 3349 _steals = 0; | |
| 3350 _aborted = 0; | |
| 3351 _aborted_overflow = 0; | |
| 3352 _aborted_cm_aborted = 0; | |
| 3353 _aborted_yield = 0; | |
| 3354 _aborted_timed_out = 0; | |
| 3355 _aborted_satb = 0; | |
| 3356 _aborted_termination = 0; | |
| 3357 #endif // _MARKING_STATS_ | |
| 3358 } | |
| 3359 | |
| 3360 bool CMTask::should_exit_termination() { | |
| 3361 regular_clock_call(); | |
| 3362 // This is called when we are in the termination protocol. We should | |
| 3363 // quit if, for some reason, this task wants to abort or the global | |
| 3364 // stack is not empty (this means that we can get work from it). | |
| 3365 return !_cm->mark_stack_empty() || has_aborted(); | |
| 3366 } | |
| 3367 | |
| 3368 void CMTask::reached_limit() { | |
|
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3369 assert(_words_scanned >= _words_scanned_limit || |
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3370 _refs_reached >= _refs_reached_limit , |
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3371 "shouldn't have been called otherwise"); |
| 342 | 3372 regular_clock_call(); |
| 3373 } | |
| 3374 | |
| 3375 void CMTask::regular_clock_call() { | |
|
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3376 if (has_aborted()) return; |
| 342 | 3377 |
| 3378 // First, we need to recalculate the words scanned and refs reached | |
| 3379 // limits for the next clock call. | |
| 3380 recalculate_limits(); | |
| 3381 | |
| 3382 // During the regular clock call we do the following | |
| 3383 | |
| 3384 // (1) If an overflow has been flagged, then we abort. | |
| 3385 if (_cm->has_overflown()) { | |
| 3386 set_has_aborted(); | |
| 3387 return; | |
| 3388 } | |
| 3389 | |
| 3390 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 3391 // to check anything else. The other steps are only needed during | |
| 3392 // the concurrent marking phase. | |
|
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3393 if (!concurrent()) return; |
| 342 | 3394 |
| 3395 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 3396 if (_cm->has_aborted()) { | |
| 3397 set_has_aborted(); | |
| 3398 statsOnly( ++_aborted_cm_aborted ); | |
| 3399 return; | |
| 3400 } | |
| 3401 | |
| 3402 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 3403 | |
| 3404 // (3) If marking stats are enabled, then we update the step history. | |
| 3405 #if _MARKING_STATS_ | |
|
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3406 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 3407 ++_clock_due_to_scanning; |
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3408 } |
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3409 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 3410 ++_clock_due_to_marking; |
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3411 } |
| 342 | 3412 |
| 3413 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 3414 _interval_start_time_ms = curr_time_ms; | |
| 3415 _all_clock_intervals_ms.add(last_interval_ms); | |
| 3416 | |
| 3417 if (_cm->verbose_medium()) { | |
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3418 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
|
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3419 "scanned = %d%s, refs reached = %d%s", |
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3420 _worker_id, last_interval_ms, |
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3421 _words_scanned, |
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3422 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3423 _refs_reached, |
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|
3424 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 3425 } |
| 3426 #endif // _MARKING_STATS_ | |
| 3427 | |
| 3428 // (4) We check whether we should yield. If we have to, then we abort. | |
| 3429 if (_cm->should_yield()) { | |
| 3430 // We should yield. To do this we abort the task. The caller is | |
| 3431 // responsible for yielding. | |
| 3432 set_has_aborted(); | |
| 3433 statsOnly( ++_aborted_yield ); | |
| 3434 return; | |
| 3435 } | |
| 3436 | |
| 3437 // (5) We check whether we've reached our time quota. If we have, | |
| 3438 // then we abort. | |
| 3439 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 3440 if (elapsed_time_ms > _time_target_ms) { | |
| 3441 set_has_aborted(); | |
|
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3442 _has_timed_out = true; |
| 342 | 3443 statsOnly( ++_aborted_timed_out ); |
| 3444 return; | |
| 3445 } | |
| 3446 | |
| 3447 // (6) Finally, we check whether there are enough completed STAB | |
| 3448 // buffers available for processing. If there are, we abort. | |
| 3449 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3450 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
|
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3451 if (_cm->verbose_low()) { |
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3452 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3453 _worker_id); |
|
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|
3454 } |
| 342 | 3455 // we do need to process SATB buffers, we'll abort and restart |
| 3456 // the marking task to do so | |
| 3457 set_has_aborted(); | |
| 3458 statsOnly( ++_aborted_satb ); | |
| 3459 return; | |
| 3460 } | |
| 3461 } | |
| 3462 | |
| 3463 void CMTask::recalculate_limits() { | |
| 3464 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 3465 _words_scanned_limit = _real_words_scanned_limit; | |
| 3466 | |
| 3467 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 3468 _refs_reached_limit = _real_refs_reached_limit; | |
| 3469 } | |
| 3470 | |
| 3471 void CMTask::decrease_limits() { | |
| 3472 // This is called when we believe that we're going to do an infrequent | |
| 3473 // operation which will increase the per byte scanned cost (i.e. move | |
| 3474 // entries to/from the global stack). It basically tries to decrease the | |
| 3475 // scanning limit so that the clock is called earlier. | |
| 3476 | |
|
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3477 if (_cm->verbose_medium()) { |
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3478 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
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3479 } |
| 342 | 3480 |
| 3481 _words_scanned_limit = _real_words_scanned_limit - | |
| 3482 3 * words_scanned_period / 4; | |
| 3483 _refs_reached_limit = _real_refs_reached_limit - | |
| 3484 3 * refs_reached_period / 4; | |
| 3485 } | |
| 3486 | |
| 3487 void CMTask::move_entries_to_global_stack() { | |
| 3488 // local array where we'll store the entries that will be popped | |
| 3489 // from the local queue | |
| 3490 oop buffer[global_stack_transfer_size]; | |
| 3491 | |
| 3492 int n = 0; | |
| 3493 oop obj; | |
| 3494 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 3495 buffer[n] = obj; | |
| 3496 ++n; | |
| 3497 } | |
| 3498 | |
| 3499 if (n > 0) { | |
| 3500 // we popped at least one entry from the local queue | |
| 3501 | |
| 3502 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 3503 | |
| 3504 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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3505 if (_cm->verbose_low()) { |
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3506 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3507 _worker_id); |
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3508 } |
| 342 | 3509 set_has_aborted(); |
| 3510 } else { | |
| 3511 // the transfer was successful | |
| 3512 | |
|
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3513 if (_cm->verbose_medium()) { |
|
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3514 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3515 _worker_id, n); |
|
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3516 } |
| 342 | 3517 statsOnly( int tmp_size = _cm->mark_stack_size(); |
|
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3518 if (tmp_size > _global_max_size) { |
| 342 | 3519 _global_max_size = tmp_size; |
|
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3520 } |
| 342 | 3521 _global_pushes += n ); |
| 3522 } | |
| 3523 } | |
| 3524 | |
| 3525 // this operation was quite expensive, so decrease the limits | |
| 3526 decrease_limits(); | |
| 3527 } | |
| 3528 | |
| 3529 void CMTask::get_entries_from_global_stack() { | |
| 3530 // local array where we'll store the entries that will be popped | |
| 3531 // from the global stack. | |
| 3532 oop buffer[global_stack_transfer_size]; | |
| 3533 int n; | |
| 3534 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
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3535 assert(n <= global_stack_transfer_size, |
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3536 "we should not pop more than the given limit"); |
| 342 | 3537 if (n > 0) { |
| 3538 // yes, we did actually pop at least one entry | |
| 3539 | |
| 3540 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
|
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3541 if (_cm->verbose_medium()) { |
|
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3542 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3543 _worker_id, n); |
|
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3544 } |
| 342 | 3545 for (int i = 0; i < n; ++i) { |
| 3546 bool success = _task_queue->push(buffer[i]); | |
| 3547 // We only call this when the local queue is empty or under a | |
| 3548 // given target limit. So, we do not expect this push to fail. | |
|
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3549 assert(success, "invariant"); |
| 342 | 3550 } |
| 3551 | |
| 3552 statsOnly( int tmp_size = _task_queue->size(); | |
|
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3553 if (tmp_size > _local_max_size) { |
| 342 | 3554 _local_max_size = tmp_size; |
|
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3555 } |
| 342 | 3556 _local_pushes += n ); |
| 3557 } | |
| 3558 | |
| 3559 // this operation was quite expensive, so decrease the limits | |
| 3560 decrease_limits(); | |
| 3561 } | |
| 3562 | |
| 3563 void CMTask::drain_local_queue(bool partially) { | |
|
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3564 if (has_aborted()) return; |
| 342 | 3565 |
| 3566 // Decide what the target size is, depending whether we're going to | |
| 3567 // drain it partially (so that other tasks can steal if they run out | |
| 3568 // of things to do) or totally (at the very end). | |
| 3569 size_t target_size; | |
|
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3570 if (partially) { |
| 342 | 3571 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
|
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3572 } else { |
| 342 | 3573 target_size = 0; |
|
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3574 } |
| 342 | 3575 |
| 3576 if (_task_queue->size() > target_size) { | |
|
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3577 if (_cm->verbose_high()) { |
|
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3578 gclog_or_tty->print_cr("[%u] draining local queue, target size = %d", |
|
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3579 _worker_id, target_size); |
|
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3580 } |
| 342 | 3581 |
| 3582 oop obj; | |
| 3583 bool ret = _task_queue->pop_local(obj); | |
| 3584 while (ret) { | |
| 3585 statsOnly( ++_local_pops ); | |
| 3586 | |
|
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3587 if (_cm->verbose_high()) { |
|
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3588 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
| 342 | 3589 (void*) obj); |
|
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3590 } |
| 342 | 3591 |
|
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3592 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 3593 assert(!_g1h->is_on_master_free_list( |
| 2152 | 3594 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 3595 |
| 3596 scan_object(obj); | |
| 3597 | |
|
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3598 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 3599 ret = false; |
|
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3600 } else { |
| 342 | 3601 ret = _task_queue->pop_local(obj); |
|
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3602 } |
| 342 | 3603 } |
| 3604 | |
|
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3605 if (_cm->verbose_high()) { |
|
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3606 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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3607 _worker_id, _task_queue->size()); |
|
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3608 } |
| 342 | 3609 } |
| 3610 } | |
| 3611 | |
| 3612 void CMTask::drain_global_stack(bool partially) { | |
|
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3613 if (has_aborted()) return; |
| 342 | 3614 |
| 3615 // We have a policy to drain the local queue before we attempt to | |
| 3616 // drain the global stack. | |
|
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3617 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 3618 |
| 3619 // Decide what the target size is, depending whether we're going to | |
| 3620 // drain it partially (so that other tasks can steal if they run out | |
| 3621 // of things to do) or totally (at the very end). Notice that, | |
| 3622 // because we move entries from the global stack in chunks or | |
| 3623 // because another task might be doing the same, we might in fact | |
| 3624 // drop below the target. But, this is not a problem. | |
| 3625 size_t target_size; | |
|
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3626 if (partially) { |
| 342 | 3627 target_size = _cm->partial_mark_stack_size_target(); |
|
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3628 } else { |
| 342 | 3629 target_size = 0; |
|
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3630 } |
| 342 | 3631 |
| 3632 if (_cm->mark_stack_size() > target_size) { | |
|
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|
3633 if (_cm->verbose_low()) { |
|
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3634 gclog_or_tty->print_cr("[%u] draining global_stack, target size %d", |
|
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3635 _worker_id, target_size); |
|
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|
3636 } |
| 342 | 3637 |
| 3638 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 3639 get_entries_from_global_stack(); | |
| 3640 drain_local_queue(partially); | |
| 3641 } | |
| 3642 | |
|
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|
3643 if (_cm->verbose_low()) { |
|
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3644 gclog_or_tty->print_cr("[%u] drained global stack, size = %d", |
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3645 _worker_id, _cm->mark_stack_size()); |
|
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|
3646 } |
| 342 | 3647 } |
| 3648 } | |
| 3649 | |
| 3650 // SATB Queue has several assumptions on whether to call the par or | |
| 3651 // non-par versions of the methods. this is why some of the code is | |
| 3652 // replicated. We should really get rid of the single-threaded version | |
| 3653 // of the code to simplify things. | |
| 3654 void CMTask::drain_satb_buffers() { | |
|
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|
3655 if (has_aborted()) return; |
| 342 | 3656 |
| 3657 // We set this so that the regular clock knows that we're in the | |
| 3658 // middle of draining buffers and doesn't set the abort flag when it | |
| 3659 // notices that SATB buffers are available for draining. It'd be | |
| 3660 // very counter productive if it did that. :-) | |
| 3661 _draining_satb_buffers = true; | |
| 3662 | |
| 3663 CMObjectClosure oc(this); | |
| 3664 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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3665 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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3666 satb_mq_set.set_par_closure(_worker_id, &oc); |
|
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|
3667 } else { |
| 342 | 3668 satb_mq_set.set_closure(&oc); |
|
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|
3669 } |
| 342 | 3670 |
| 3671 // This keeps claiming and applying the closure to completed buffers | |
| 3672 // until we run out of buffers or we need to abort. | |
|
1833
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|
3673 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3674 while (!has_aborted() && |
|
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3675 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
|
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|
3676 if (_cm->verbose_medium()) { |
|
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|
3677 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
|
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|
3678 } |
| 342 | 3679 statsOnly( ++_satb_buffers_processed ); |
| 3680 regular_clock_call(); | |
| 3681 } | |
| 3682 } else { | |
| 3683 while (!has_aborted() && | |
| 3684 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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|
3685 if (_cm->verbose_medium()) { |
|
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|
3686 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
|
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|
3687 } |
| 342 | 3688 statsOnly( ++_satb_buffers_processed ); |
| 3689 regular_clock_call(); | |
| 3690 } | |
| 3691 } | |
| 3692 | |
| 3693 if (!concurrent() && !has_aborted()) { | |
| 3694 // We should only do this during remark. | |
|
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|
3695 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
3696 satb_mq_set.par_iterate_closure_all_threads(_worker_id); |
|
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|
3697 } else { |
| 342 | 3698 satb_mq_set.iterate_closure_all_threads(); |
|
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|
3699 } |
| 342 | 3700 } |
| 3701 | |
| 3702 _draining_satb_buffers = false; | |
| 3703 | |
|
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|
3704 assert(has_aborted() || |
|
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|
3705 concurrent() || |
|
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|
3706 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 3707 |
|
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|
3708 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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3709 satb_mq_set.set_par_closure(_worker_id, NULL); |
|
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|
3710 } else { |
| 342 | 3711 satb_mq_set.set_closure(NULL); |
|
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|
3712 } |
| 342 | 3713 |
| 3714 // again, this was a potentially expensive operation, decrease the | |
| 3715 // limits to get the regular clock call early | |
| 3716 decrease_limits(); | |
| 3717 } | |
| 3718 | |
| 3719 void CMTask::print_stats() { | |
|
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3720 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
|
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|
3721 _worker_id, _calls); |
| 342 | 3722 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
| 3723 _elapsed_time_ms, _termination_time_ms); | |
| 3724 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 3725 _step_times_ms.num(), _step_times_ms.avg(), | |
| 3726 _step_times_ms.sd()); | |
| 3727 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 3728 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 3729 | |
| 3730 #if _MARKING_STATS_ | |
| 3731 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 3732 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 3733 _all_clock_intervals_ms.sd()); | |
| 3734 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 3735 _all_clock_intervals_ms.maximum(), | |
| 3736 _all_clock_intervals_ms.sum()); | |
| 3737 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 3738 _clock_due_to_scanning, _clock_due_to_marking); | |
| 3739 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 3740 _objs_scanned, _objs_found_on_bitmap); | |
| 3741 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 3742 _local_pushes, _local_pops, _local_max_size); | |
| 3743 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 3744 _global_pushes, _global_pops, _global_max_size); | |
| 3745 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 3746 _global_transfers_to,_global_transfers_from); | |
|
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|
3747 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
| 342 | 3748 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
| 3749 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 3750 _steal_attempts, _steals); | |
| 3751 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 3752 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 3753 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 3754 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 3755 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 3756 #endif // _MARKING_STATS_ | |
| 3757 } | |
| 3758 | |
| 3759 /***************************************************************************** | |
| 3760 | |
| 3761 The do_marking_step(time_target_ms) method is the building block | |
| 3762 of the parallel marking framework. It can be called in parallel | |
| 3763 with other invocations of do_marking_step() on different tasks | |
| 3764 (but only one per task, obviously) and concurrently with the | |
| 3765 mutator threads, or during remark, hence it eliminates the need | |
| 3766 for two versions of the code. When called during remark, it will | |
| 3767 pick up from where the task left off during the concurrent marking | |
| 3768 phase. Interestingly, tasks are also claimable during evacuation | |
| 3769 pauses too, since do_marking_step() ensures that it aborts before | |
| 3770 it needs to yield. | |
| 3771 | |
| 3772 The data structures that is uses to do marking work are the | |
| 3773 following: | |
| 3774 | |
| 3775 (1) Marking Bitmap. If there are gray objects that appear only | |
| 3776 on the bitmap (this happens either when dealing with an overflow | |
| 3777 or when the initial marking phase has simply marked the roots | |
| 3778 and didn't push them on the stack), then tasks claim heap | |
| 3779 regions whose bitmap they then scan to find gray objects. A | |
| 3780 global finger indicates where the end of the last claimed region | |
| 3781 is. A local finger indicates how far into the region a task has | |
| 3782 scanned. The two fingers are used to determine how to gray an | |
| 3783 object (i.e. whether simply marking it is OK, as it will be | |
| 3784 visited by a task in the future, or whether it needs to be also | |
| 3785 pushed on a stack). | |
| 3786 | |
| 3787 (2) Local Queue. The local queue of the task which is accessed | |
| 3788 reasonably efficiently by the task. Other tasks can steal from | |
| 3789 it when they run out of work. Throughout the marking phase, a | |
| 3790 task attempts to keep its local queue short but not totally | |
| 3791 empty, so that entries are available for stealing by other | |
| 3792 tasks. Only when there is no more work, a task will totally | |
| 3793 drain its local queue. | |
| 3794 | |
| 3795 (3) Global Mark Stack. This handles local queue overflow. During | |
| 3796 marking only sets of entries are moved between it and the local | |
| 3797 queues, as access to it requires a mutex and more fine-grain | |
| 3798 interaction with it which might cause contention. If it | |
| 3799 overflows, then the marking phase should restart and iterate | |
| 3800 over the bitmap to identify gray objects. Throughout the marking | |
| 3801 phase, tasks attempt to keep the global mark stack at a small | |
| 3802 length but not totally empty, so that entries are available for | |
| 3803 popping by other tasks. Only when there is no more work, tasks | |
| 3804 will totally drain the global mark stack. | |
| 3805 | |
|
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3806 (4) SATB Buffer Queue. This is where completed SATB buffers are |
| 342 | 3807 made available. Buffers are regularly removed from this queue |
| 3808 and scanned for roots, so that the queue doesn't get too | |
| 3809 long. During remark, all completed buffers are processed, as | |
| 3810 well as the filled in parts of any uncompleted buffers. | |
| 3811 | |
| 3812 The do_marking_step() method tries to abort when the time target | |
| 3813 has been reached. There are a few other cases when the | |
| 3814 do_marking_step() method also aborts: | |
| 3815 | |
| 3816 (1) When the marking phase has been aborted (after a Full GC). | |
| 3817 | |
|
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3818 (2) When a global overflow (on the global stack) has been |
|
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3819 triggered. Before the task aborts, it will actually sync up with |
|
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3820 the other tasks to ensure that all the marking data structures |
|
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3821 (local queues, stacks, fingers etc.) are re-initialised so that |
|
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3822 when do_marking_step() completes, the marking phase can |
|
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3823 immediately restart. |
| 342 | 3824 |
| 3825 (3) When enough completed SATB buffers are available. The | |
| 3826 do_marking_step() method only tries to drain SATB buffers right | |
| 3827 at the beginning. So, if enough buffers are available, the | |
| 3828 marking step aborts and the SATB buffers are processed at | |
| 3829 the beginning of the next invocation. | |
| 3830 | |
| 3831 (4) To yield. when we have to yield then we abort and yield | |
| 3832 right at the end of do_marking_step(). This saves us from a lot | |
| 3833 of hassle as, by yielding we might allow a Full GC. If this | |
| 3834 happens then objects will be compacted underneath our feet, the | |
| 3835 heap might shrink, etc. We save checking for this by just | |
| 3836 aborting and doing the yield right at the end. | |
| 3837 | |
| 3838 From the above it follows that the do_marking_step() method should | |
| 3839 be called in a loop (or, otherwise, regularly) until it completes. | |
| 3840 | |
| 3841 If a marking step completes without its has_aborted() flag being | |
| 3842 true, it means it has completed the current marking phase (and | |
| 3843 also all other marking tasks have done so and have all synced up). | |
| 3844 | |
| 3845 A method called regular_clock_call() is invoked "regularly" (in | |
| 3846 sub ms intervals) throughout marking. It is this clock method that | |
| 3847 checks all the abort conditions which were mentioned above and | |
| 3848 decides when the task should abort. A work-based scheme is used to | |
| 3849 trigger this clock method: when the number of object words the | |
| 3850 marking phase has scanned or the number of references the marking | |
| 3851 phase has visited reach a given limit. Additional invocations to | |
| 3852 the method clock have been planted in a few other strategic places | |
| 3853 too. The initial reason for the clock method was to avoid calling | |
| 3854 vtime too regularly, as it is quite expensive. So, once it was in | |
| 3855 place, it was natural to piggy-back all the other conditions on it | |
| 3856 too and not constantly check them throughout the code. | |
| 3857 | |
| 3858 *****************************************************************************/ | |
| 3859 | |
|
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3860 void CMTask::do_marking_step(double time_target_ms, |
|
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3861 bool do_stealing, |
|
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3862 bool do_termination) { |
|
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3863 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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3864 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
|
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3865 |
| 342 | 3866 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
|
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3867 assert(_task_queues != NULL, "invariant"); |
|
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3868 assert(_task_queue != NULL, "invariant"); |
|
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3869 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
|
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3870 |
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3871 assert(!_claimed, |
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3872 "only one thread should claim this task at any one time"); |
| 342 | 3873 |
| 3874 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 3875 // possible for two threads to set the _claimed flag at the same | |
| 3876 // time. But it is only for debugging purposes anyway and it will | |
| 3877 // catch most problems. | |
| 3878 _claimed = true; | |
| 3879 | |
| 3880 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 3881 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 3882 | |
| 3883 double diff_prediction_ms = | |
| 3884 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 3885 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 3886 | |
| 3887 // set up the variables that are used in the work-based scheme to | |
| 3888 // call the regular clock method | |
| 3889 _words_scanned = 0; | |
| 3890 _refs_reached = 0; | |
| 3891 recalculate_limits(); | |
| 3892 | |
| 3893 // clear all flags | |
| 3894 clear_has_aborted(); | |
|
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3895 _has_timed_out = false; |
| 342 | 3896 _draining_satb_buffers = false; |
| 3897 | |
| 3898 ++_calls; | |
| 3899 | |
|
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3900 if (_cm->verbose_low()) { |
|
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3901 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
| 342 | 3902 "target = %1.2lfms >>>>>>>>>>", |
|
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3903 _worker_id, _calls, _time_target_ms); |
|
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3904 } |
| 342 | 3905 |
| 3906 // Set up the bitmap and oop closures. Anything that uses them is | |
| 3907 // eventually called from this method, so it is OK to allocate these | |
| 3908 // statically. | |
| 3909 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 3910 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 3911 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 3912 |
| 3913 if (_cm->has_overflown()) { | |
|
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3914 // This can happen if the mark stack overflows during a GC pause |
|
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3915 // and this task, after a yield point, restarts. We have to abort |
|
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3916 // as we need to get into the overflow protocol which happens |
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3917 // right at the end of this task. |
| 342 | 3918 set_has_aborted(); |
| 3919 } | |
| 3920 | |
| 3921 // First drain any available SATB buffers. After this, we will not | |
| 3922 // look at SATB buffers before the next invocation of this method. | |
| 3923 // If enough completed SATB buffers are queued up, the regular clock | |
| 3924 // will abort this task so that it restarts. | |
| 3925 drain_satb_buffers(); | |
| 3926 // ...then partially drain the local queue and the global stack | |
| 3927 drain_local_queue(true); | |
| 3928 drain_global_stack(true); | |
| 3929 | |
| 3930 do { | |
| 3931 if (!has_aborted() && _curr_region != NULL) { | |
| 3932 // This means that we're already holding on to a region. | |
|
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3933 assert(_finger != NULL, "if region is not NULL, then the finger " |
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|
3934 "should not be NULL either"); |
| 342 | 3935 |
| 3936 // We might have restarted this task after an evacuation pause | |
| 3937 // which might have evacuated the region we're holding on to | |
| 3938 // underneath our feet. Let's read its limit again to make sure | |
| 3939 // that we do not iterate over a region of the heap that | |
| 3940 // contains garbage (update_region_limit() will also move | |
| 3941 // _finger to the start of the region if it is found empty). | |
| 3942 update_region_limit(); | |
| 3943 // We will start from _finger not from the start of the region, | |
| 3944 // as we might be restarting this task after aborting half-way | |
| 3945 // through scanning this region. In this case, _finger points to | |
| 3946 // the address where we last found a marked object. If this is a | |
| 3947 // fresh region, _finger points to start(). | |
| 3948 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 3949 | |
|
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3950 if (_cm->verbose_low()) { |
|
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3951 gclog_or_tty->print_cr("[%u] we're scanning part " |
| 342 | 3952 "["PTR_FORMAT", "PTR_FORMAT") " |
| 3953 "of region "PTR_FORMAT, | |
|
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3954 _worker_id, _finger, _region_limit, _curr_region); |
|
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|
3955 } |
| 342 | 3956 |
| 3957 // Let's iterate over the bitmap of the part of the | |
| 3958 // region that is left. | |
|
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3959 if (mr.is_empty() || _nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
| 342 | 3960 // We successfully completed iterating over the region. Now, |
| 3961 // let's give up the region. | |
| 3962 giveup_current_region(); | |
| 3963 regular_clock_call(); | |
| 3964 } else { | |
|
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|
3965 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 3966 // The only way to abort the bitmap iteration is to return |
| 3967 // false from the do_bit() method. However, inside the | |
| 3968 // do_bit() method we move the _finger to point to the | |
| 3969 // object currently being looked at. So, if we bail out, we | |
| 3970 // have definitely set _finger to something non-null. | |
|
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3971 assert(_finger != NULL, "invariant"); |
| 342 | 3972 |
| 3973 // Region iteration was actually aborted. So now _finger | |
| 3974 // points to the address of the object we last scanned. If we | |
| 3975 // leave it there, when we restart this task, we will rescan | |
| 3976 // the object. It is easy to avoid this. We move the finger by | |
| 3977 // enough to point to the next possible object header (the | |
| 3978 // bitmap knows by how much we need to move it as it knows its | |
| 3979 // granularity). | |
|
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|
3980 assert(_finger < _region_limit, "invariant"); |
|
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|
3981 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
|
3f0549ed0c98
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|
3982 // Check if bitmap iteration was aborted while scanning the last object |
|
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|
3983 if (new_finger >= _region_limit) { |
|
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3984 giveup_current_region(); |
|
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|
3985 } else { |
|
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|
3986 move_finger_to(new_finger); |
|
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|
3987 } |
| 342 | 3988 } |
| 3989 } | |
| 3990 // At this point we have either completed iterating over the | |
| 3991 // region we were holding on to, or we have aborted. | |
| 3992 | |
| 3993 // We then partially drain the local queue and the global stack. | |
| 3994 // (Do we really need this?) | |
| 3995 drain_local_queue(true); | |
| 3996 drain_global_stack(true); | |
| 3997 | |
| 3998 // Read the note on the claim_region() method on why it might | |
| 3999 // return NULL with potentially more regions available for | |
| 4000 // claiming and why we have to check out_of_regions() to determine | |
| 4001 // whether we're done or not. | |
| 4002 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 4003 // We are going to try to claim a new region. We should have | |
| 4004 // given up on the previous one. | |
|
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4005 // Separated the asserts so that we know which one fires. |
|
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4006 assert(_curr_region == NULL, "invariant"); |
|
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|
4007 assert(_finger == NULL, "invariant"); |
|
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4008 assert(_region_limit == NULL, "invariant"); |
|
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4009 if (_cm->verbose_low()) { |
|
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4010 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
|
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4011 } |
|
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4012 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
| 342 | 4013 if (claimed_region != NULL) { |
| 4014 // Yes, we managed to claim one | |
| 4015 statsOnly( ++_regions_claimed ); | |
| 4016 | |
|
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|
4017 if (_cm->verbose_low()) { |
|
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|
4018 gclog_or_tty->print_cr("[%u] we successfully claimed " |
| 342 | 4019 "region "PTR_FORMAT, |
|
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4020 _worker_id, claimed_region); |
|
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|
4021 } |
| 342 | 4022 |
| 4023 setup_for_region(claimed_region); | |
|
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4024 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 4025 } |
| 4026 // It is important to call the regular clock here. It might take | |
| 4027 // a while to claim a region if, for example, we hit a large | |
| 4028 // block of empty regions. So we need to call the regular clock | |
| 4029 // method once round the loop to make sure it's called | |
| 4030 // frequently enough. | |
| 4031 regular_clock_call(); | |
| 4032 } | |
| 4033 | |
| 4034 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
4035 assert(_cm->out_of_regions(), |
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|
4036 "at this point we should be out of regions"); |
| 342 | 4037 } |
| 4038 } while ( _curr_region != NULL && !has_aborted()); | |
| 4039 | |
| 4040 if (!has_aborted()) { | |
| 4041 // We cannot check whether the global stack is empty, since other | |
|
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|
4042 // tasks might be pushing objects to it concurrently. |
|
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|
4043 assert(_cm->out_of_regions(), |
|
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|
4044 "at this point we should be out of regions"); |
| 342 | 4045 |
|
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|
4046 if (_cm->verbose_low()) { |
|
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|
4047 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
|
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|
4048 } |
| 342 | 4049 |
| 4050 // Try to reduce the number of available SATB buffers so that | |
| 4051 // remark has less work to do. | |
| 4052 drain_satb_buffers(); | |
| 4053 } | |
| 4054 | |
| 4055 // Since we've done everything else, we can now totally drain the | |
| 4056 // local queue and global stack. | |
| 4057 drain_local_queue(false); | |
| 4058 drain_global_stack(false); | |
| 4059 | |
| 4060 // Attempt at work stealing from other task's queues. | |
|
2174
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|
4061 if (do_stealing && !has_aborted()) { |
| 342 | 4062 // We have not aborted. This means that we have finished all that |
| 4063 // we could. Let's try to do some stealing... | |
| 4064 | |
| 4065 // We cannot check whether the global stack is empty, since other | |
|
5988
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7127697: G1: remove dead code after recent concurrent mark changes
tonyp
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|
4066 // tasks might be pushing objects to it concurrently. |
|
1023
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|
4067 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
4068 "only way to reach here"); |
| 342 | 4069 |
|
3776
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|
4070 if (_cm->verbose_low()) { |
|
6862
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|
4071 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
|
3776
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|
4072 } |
| 342 | 4073 |
| 4074 while (!has_aborted()) { | |
| 4075 oop obj; | |
| 4076 statsOnly( ++_steal_attempts ); | |
| 4077 | |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4078 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
|
3776
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|
4079 if (_cm->verbose_medium()) { |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
4080 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
|
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4081 _worker_id, (void*) obj); |
|
3776
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|
4082 } |
| 342 | 4083 |
| 4084 statsOnly( ++_steals ); | |
| 4085 | |
|
1023
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|
4086 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
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|
4087 "any stolen object should be marked"); |
| 342 | 4088 scan_object(obj); |
| 4089 | |
| 4090 // And since we're towards the end, let's totally drain the | |
| 4091 // local queue and global stack. | |
| 4092 drain_local_queue(false); | |
| 4093 drain_global_stack(false); | |
| 4094 } else { | |
| 4095 break; | |
| 4096 } | |
| 4097 } | |
| 4098 } | |
| 4099 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4100 // If we are about to wrap up and go into termination, check if we |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4101 // should raise the overflow flag. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4102 if (do_termination && !has_aborted()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4103 if (_cm->force_overflow()->should_force()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4104 _cm->set_has_overflown(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4105 regular_clock_call(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4106 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4107 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4108 |
| 342 | 4109 // We still haven't aborted. Now, let's try to get into the |
| 4110 // termination protocol. | |
|
2174
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|
4111 if (do_termination && !has_aborted()) { |
| 342 | 4112 // We cannot check whether the global stack is empty, since other |
|
5988
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|
4113 // tasks might be concurrently pushing objects on it. |
|
1023
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|
4114 // Separated the asserts so that we know which one fires. |
|
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|
4115 assert(_cm->out_of_regions(), "only way to reach here"); |
|
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|
4116 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 4117 |
|
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|
4118 if (_cm->verbose_low()) { |
|
6862
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|
4119 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
|
3776
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|
4120 } |
| 342 | 4121 |
| 4122 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4123 // The CMTask class also extends the TerminatorTerminator class, | |
| 4124 // hence its should_exit_termination() method will also decide | |
| 4125 // whether to exit the termination protocol or not. | |
| 4126 bool finished = _cm->terminator()->offer_termination(this); | |
| 4127 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
| 4128 _termination_time_ms += | |
| 4129 termination_end_time_ms - _termination_start_time_ms; | |
| 4130 | |
| 4131 if (finished) { | |
| 4132 // We're all done. | |
| 4133 | |
|
6862
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|
4134 if (_worker_id == 0) { |
| 342 | 4135 // let's allow task 0 to do this |
| 4136 if (concurrent()) { | |
|
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|
4137 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 4138 // we need to set this to false before the next |
| 4139 // safepoint. This way we ensure that the marking phase | |
| 4140 // doesn't observe any more heap expansions. | |
| 4141 _cm->clear_concurrent_marking_in_progress(); | |
| 4142 } | |
| 4143 } | |
| 4144 | |
| 4145 // We can now guarantee that the global stack is empty, since | |
|
1023
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6888619: G1: too many guarantees in concurrent marking
tonyp
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diff
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|
4146 // all other tasks have finished. We separated the guarantees so |
|
11d4857fe5e1
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diff
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|
4147 // that, if a condition is false, we can immediately find out |
|
11d4857fe5e1
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|
4148 // which one. |
|
11d4857fe5e1
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|
4149 guarantee(_cm->out_of_regions(), "only way to reach here"); |
|
11d4857fe5e1
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|
4150 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4151 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
11d4857fe5e1
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tonyp
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1022
diff
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|
4152 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
11d4857fe5e1
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changeset
|
4153 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
| 342 | 4154 |
|
3776
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|
4155 if (_cm->verbose_low()) { |
|
6862
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|
4156 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
|
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|
4157 } |
| 342 | 4158 } else { |
| 4159 // Apparently there's more work to do. Let's abort this task. It | |
| 4160 // will restart it and we can hopefully find more things to do. | |
| 4161 | |
|
3776
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|
4162 if (_cm->verbose_low()) { |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
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diff
changeset
|
4163 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
|
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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changeset
|
4164 _worker_id); |
|
3776
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|
4165 } |
| 342 | 4166 |
| 4167 set_has_aborted(); | |
| 4168 statsOnly( ++_aborted_termination ); | |
| 4169 } | |
| 4170 } | |
| 4171 | |
| 4172 // Mainly for debugging purposes to make sure that a pointer to the | |
| 4173 // closure which was statically allocated in this frame doesn't | |
| 4174 // escape it by accident. | |
| 3771 | 4175 set_cm_oop_closure(NULL); |
| 342 | 4176 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 4177 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 4178 // Update the step history. | |
| 4179 _step_times_ms.add(elapsed_time_ms); | |
| 4180 | |
| 4181 if (has_aborted()) { | |
| 4182 // The task was aborted for some reason. | |
| 4183 | |
| 4184 statsOnly( ++_aborted ); | |
| 4185 | |
|
2174
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|
4186 if (_has_timed_out) { |
| 342 | 4187 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 4188 // Keep statistics of how well we did with respect to hitting | |
| 4189 // our target only if we actually timed out (if we aborted for | |
| 4190 // other reasons, then the results might get skewed). | |
| 4191 _marking_step_diffs_ms.add(diff_ms); | |
| 4192 } | |
| 4193 | |
| 4194 if (_cm->has_overflown()) { | |
| 4195 // This is the interesting one. We aborted because a global | |
| 4196 // overflow was raised. This means we have to restart the | |
| 4197 // marking phase and start iterating over regions. However, in | |
| 4198 // order to do this we have to make sure that all tasks stop | |
| 4199 // what they are doing and re-initialise in a safe manner. We | |
| 4200 // will achieve this with the use of two barrier sync points. | |
| 4201 | |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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changeset
|
4202 if (_cm->verbose_low()) { |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
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diff
changeset
|
4203 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
4204 } |
| 342 | 4205 |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
diff
changeset
|
4206 _cm->enter_first_sync_barrier(_worker_id); |
| 342 | 4207 // When we exit this sync barrier we know that all tasks have |
| 4208 // stopped doing marking work. So, it's now safe to | |
| 4209 // re-initialise our data structures. At the end of this method, | |
| 4210 // task 0 will clear the global data structures. | |
| 4211 | |
| 4212 statsOnly( ++_aborted_overflow ); | |
| 4213 | |
| 4214 // We clear the local state of this task... | |
| 4215 clear_region_fields(); | |
| 4216 | |
| 4217 // ...and enter the second barrier. | |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
diff
changeset
|
4218 _cm->enter_second_sync_barrier(_worker_id); |
| 342 | 4219 // At this point everything has bee re-initialised and we're |
| 4220 // ready to restart. | |
| 4221 } | |
| 4222 | |
| 4223 if (_cm->verbose_low()) { | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
diff
changeset
|
4224 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
| 342 | 4225 "elapsed = %1.2lfms <<<<<<<<<<", |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
diff
changeset
|
4226 _worker_id, _time_target_ms, elapsed_time_ms); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4227 if (_cm->has_aborted()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4228 gclog_or_tty->print_cr("[%u] ========== MARKING ABORTED ==========", |
|
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
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changeset
|
4229 _worker_id); |
|
3776
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changeset
|
4230 } |
| 342 | 4231 } |
| 4232 } else { | |
|
3776
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changeset
|
4233 if (_cm->verbose_low()) { |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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changeset
|
4234 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 342 | 4235 "elapsed = %1.2lfms <<<<<<<<<<", |
|
6862
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|
4236 _worker_id, _time_target_ms, elapsed_time_ms); |
|
3776
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|
4237 } |
| 342 | 4238 } |
| 4239 | |
| 4240 _claimed = false; | |
| 4241 } | |
| 4242 | |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
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changeset
|
4243 CMTask::CMTask(uint worker_id, |
| 342 | 4244 ConcurrentMark* cm, |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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4830
diff
changeset
|
4245 size_t* marked_bytes, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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4830
diff
changeset
|
4246 BitMap* card_bm, |
| 342 | 4247 CMTaskQueue* task_queue, |
| 4248 CMTaskQueueSet* task_queues) | |
| 4249 : _g1h(G1CollectedHeap::heap()), | |
|
6862
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changeset
|
4250 _worker_id(worker_id), _cm(cm), |
| 342 | 4251 _claimed(false), |
| 4252 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 4253 _task_queue(task_queue), | |
| 4254 _task_queues(task_queues), | |
| 3771 | 4255 _cm_oop_closure(NULL), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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4830
diff
changeset
|
4256 _marked_bytes_array(marked_bytes), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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diff
changeset
|
4257 _card_bm(card_bm) { |
|
1023
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diff
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|
4258 guarantee(task_queue != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4259 guarantee(task_queues != NULL, "invariant"); |
| 342 | 4260 |
| 4261 statsOnly( _clock_due_to_scanning = 0; | |
| 4262 _clock_due_to_marking = 0 ); | |
| 4263 | |
| 4264 _marking_step_diffs_ms.add(0.5); | |
| 4265 } | |
|
2435
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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|
4266 |
|
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
|
4267 // These are formatting macros that are used below to ensure |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4268 // consistent formatting. The *_H_* versions are used to format the |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4269 // header for a particular value and they should be kept consistent |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4270 // with the corresponding macro. Also note that most of the macros add |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4271 // the necessary white space (as a prefix) which makes them a bit |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4272 // easier to compose. |
|
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
|
4273 |
|
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
|
4274 // All the output lines are prefixed with this string to be able to |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4275 // 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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|
4276 #define G1PPRL_LINE_PREFIX "###" |
|
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|
4277 |
|
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|
4278 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
|
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|
4279 #ifdef _LP64 |
|
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|
4280 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
|
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|
4281 #else // _LP64 |
|
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|
4282 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
|
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|
4283 #endif // _LP64 |
|
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|
4284 |
|
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changeset
|
4285 // For per-region info |
|
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|
4286 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
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|
4287 #define G1PPRL_TYPE_H_FORMAT " %4s" |
|
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|
4288 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
|
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|
4289 #define G1PPRL_BYTE_H_FORMAT " %9s" |
|
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|
4290 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
|
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|
4291 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
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|
4292 |
|
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changeset
|
4293 // For summary info |
|
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|
4294 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
|
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|
4295 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
|
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|
4296 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
|
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|
4297 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
|
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|
4298 |
|
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|
4299 G1PrintRegionLivenessInfoClosure:: |
|
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|
4300 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
|
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|
4301 : _out(out), |
|
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|
4302 _total_used_bytes(0), _total_capacity_bytes(0), |
|
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|
4303 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
|
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|
4304 _hum_used_bytes(0), _hum_capacity_bytes(0), |
|
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|
4305 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
|
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|
4306 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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|
4307 MemRegion g1_committed = g1h->g1_committed(); |
|
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|
4308 MemRegion g1_reserved = g1h->g1_reserved(); |
|
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|
4309 double now = os::elapsedTime(); |
|
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|
4310 |
|
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|
4311 // Print the header of the output. |
|
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|
4312 _out->cr(); |
|
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|
4313 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
|
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|
4314 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
|
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|
4315 G1PPRL_SUM_ADDR_FORMAT("committed") |
|
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|
4316 G1PPRL_SUM_ADDR_FORMAT("reserved") |
|
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|
4317 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
|
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|
4318 g1_committed.start(), g1_committed.end(), |
|
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|
4319 g1_reserved.start(), g1_reserved.end(), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
4320 HeapRegion::GrainBytes); |
|
2435
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|
4321 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
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|
4322 _out->print_cr(G1PPRL_LINE_PREFIX |
|
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|
4323 G1PPRL_TYPE_H_FORMAT |
|
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|
4324 G1PPRL_ADDR_BASE_H_FORMAT |
|
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|
4325 G1PPRL_BYTE_H_FORMAT |
|
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|
4326 G1PPRL_BYTE_H_FORMAT |
|
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|
4327 G1PPRL_BYTE_H_FORMAT |
|
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|
4328 G1PPRL_DOUBLE_H_FORMAT, |
|
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|
4329 "type", "address-range", |
|
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|
4330 "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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|
4331 _out->print_cr(G1PPRL_LINE_PREFIX |
|
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|
4332 G1PPRL_TYPE_H_FORMAT |
|
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|
4333 G1PPRL_ADDR_BASE_H_FORMAT |
|
5cc33133bc6d
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|
4334 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
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|
4335 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
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|
4336 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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|
4337 G1PPRL_DOUBLE_H_FORMAT, |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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|
4338 "", "", |
|
5cc33133bc6d
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3975
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|
4339 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
|
2435
371bbc844bf1
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|
4340 } |
|
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changeset
|
4341 |
|
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|
4342 // It takes as a parameter a reference to one of the _hum_* fields, it |
|
371bbc844bf1
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|
4343 // deduces the corresponding value for a region in a humongous region |
|
371bbc844bf1
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|
4344 // series (either the region size, or what's left if the _hum_* field |
|
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|
4345 // is < the region size), and updates the _hum_* field accordingly. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4346 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
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|
4347 size_t bytes = 0; |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4348 // The > 0 check is to deal with the prev and next live bytes which |
|
371bbc844bf1
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|
4349 // could be 0. |
|
371bbc844bf1
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|
4350 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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3979
diff
changeset
|
4351 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
371bbc844bf1
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|
4352 *hum_bytes -= bytes; |
|
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|
4353 } |
|
371bbc844bf1
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changeset
|
4354 return bytes; |
|
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|
4355 } |
|
371bbc844bf1
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diff
changeset
|
4356 |
|
371bbc844bf1
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diff
changeset
|
4357 // It deduces the values for a region in a humongous region series |
|
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|
4358 // from the _hum_* fields and updates those accordingly. It assumes |
|
371bbc844bf1
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diff
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|
4359 // that that _hum_* fields have already been set up from the "starts |
|
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|
4360 // humongous" region and we visit the regions in address order. |
|
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|
4361 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
|
371bbc844bf1
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|
4362 size_t* capacity_bytes, |
|
371bbc844bf1
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|
4363 size_t* prev_live_bytes, |
|
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|
4364 size_t* next_live_bytes) { |
|
371bbc844bf1
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|
4365 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
|
371bbc844bf1
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|
4366 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
|
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|
4367 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
|
371bbc844bf1
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|
4368 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
|
371bbc844bf1
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|
4369 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
|
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|
4370 } |
|
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diff
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|
4371 |
|
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|
4372 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
|
371bbc844bf1
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|
4373 const char* type = ""; |
|
371bbc844bf1
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|
4374 HeapWord* bottom = r->bottom(); |
|
371bbc844bf1
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|
4375 HeapWord* end = r->end(); |
|
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|
4376 size_t capacity_bytes = r->capacity(); |
|
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|
4377 size_t used_bytes = r->used(); |
|
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|
4378 size_t prev_live_bytes = r->live_bytes(); |
|
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|
4379 size_t next_live_bytes = r->next_live_bytes(); |
|
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|
4380 double gc_eff = r->gc_efficiency(); |
|
371bbc844bf1
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|
4381 if (r->used() == 0) { |
|
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diff
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|
4382 type = "FREE"; |
|
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changeset
|
4383 } else if (r->is_survivor()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4384 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4385 } else if (r->is_young()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4386 type = "EDEN"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4387 } else if (r->startsHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4388 type = "HUMS"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4389 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4390 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4391 _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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|
4392 "they should have been zeroed after the last time we used them"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4393 // Set up the _hum_* fields. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4394 _hum_capacity_bytes = capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4395 _hum_used_bytes = used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4396 _hum_prev_live_bytes = prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4397 _hum_next_live_bytes = next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4398 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4399 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4400 end = bottom + HeapRegion::GrainWords; |
|
371bbc844bf1
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|
4401 } else if (r->continuesHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4402 type = "HUMC"; |
|
371bbc844bf1
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|
4403 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4404 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4405 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4406 } else { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4407 type = "OLD"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4408 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4409 |
|
371bbc844bf1
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diff
changeset
|
4410 _total_used_bytes += used_bytes; |
|
371bbc844bf1
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|
4411 _total_capacity_bytes += capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4412 _total_prev_live_bytes += prev_live_bytes; |
|
371bbc844bf1
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changeset
|
4413 _total_next_live_bytes += next_live_bytes; |
|
371bbc844bf1
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2369
diff
changeset
|
4414 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4415 // Print a line for this particular region. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4416 _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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diff
changeset
|
4417 G1PPRL_TYPE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4418 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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diff
changeset
|
4419 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4420 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4421 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4422 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
|
4423 type, bottom, end, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4424 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
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2369
diff
changeset
|
4425 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4426 return false; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4427 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4428 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4429 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4430 // Print the footer of the output. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4431 _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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2369
diff
changeset
|
4432 _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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2369
diff
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|
4433 " SUMMARY" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4434 G1PPRL_SUM_MB_FORMAT("capacity") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4435 G1PPRL_SUM_MB_PERC_FORMAT("used") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4436 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4437 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4438 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
|
4439 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
|
4440 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
|
4441 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
|
4442 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
|
4443 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
|
4444 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
|
4445 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4446 } |