Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 6629:c9814fadeb38
7041879: G1: introduce stress testing parameter to cause frequent evacuation failures
Summary: Add the flags G1EvacuationFailureALot flag (and supporting flags) to force trigger evacuation failures. The support flags control how often to trigger an evacuation failure and during which types of evacuation pause. This functionality is analogous to that of PromotionFailureALot for the other collectors.
Reviewed-by: brutisso
| author | johnc |
|---|---|
| date | Tue, 28 Aug 2012 15:20:08 -0700 |
| parents | a2f7274eb6ef |
| children | da91efe96a93 |
| 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 { | |
| 318 return (_g1h->is_obj_ill(obj) | |
| 319 || (_g1h->is_in_permanent(obj) | |
| 320 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
| 321 } | |
| 322 | |
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323 CMRootRegions::CMRootRegions() : |
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324 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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325 _should_abort(false), _next_survivor(NULL) { } |
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326 |
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327 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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328 _young_list = g1h->young_list(); |
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329 _cm = cm; |
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330 } |
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331 |
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332 void CMRootRegions::prepare_for_scan() { |
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333 assert(!scan_in_progress(), "pre-condition"); |
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334 |
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335 // Currently, only survivors can be root regions. |
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336 assert(_next_survivor == NULL, "pre-condition"); |
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337 _next_survivor = _young_list->first_survivor_region(); |
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338 _scan_in_progress = (_next_survivor != NULL); |
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339 _should_abort = false; |
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340 } |
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341 |
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342 HeapRegion* CMRootRegions::claim_next() { |
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343 if (_should_abort) { |
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344 // If someone has set the should_abort flag, we return NULL to |
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345 // force the caller to bail out of their loop. |
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346 return NULL; |
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347 } |
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348 |
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349 // Currently, only survivors can be root regions. |
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350 HeapRegion* res = _next_survivor; |
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351 if (res != NULL) { |
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352 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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353 // Read it again in case it changed while we were waiting for the lock. |
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354 res = _next_survivor; |
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355 if (res != NULL) { |
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356 if (res == _young_list->last_survivor_region()) { |
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357 // We just claimed the last survivor so store NULL to indicate |
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358 // that we're done. |
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359 _next_survivor = NULL; |
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360 } else { |
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361 _next_survivor = res->get_next_young_region(); |
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362 } |
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363 } else { |
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364 // Someone else claimed the last survivor while we were trying |
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365 // to take the lock so nothing else to do. |
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366 } |
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367 } |
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368 assert(res == NULL || res->is_survivor(), "post-condition"); |
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369 |
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370 return res; |
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371 } |
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372 |
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373 void CMRootRegions::scan_finished() { |
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374 assert(scan_in_progress(), "pre-condition"); |
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375 |
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376 // Currently, only survivors can be root regions. |
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377 if (!_should_abort) { |
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378 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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379 } |
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380 _next_survivor = NULL; |
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381 |
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382 { |
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383 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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384 _scan_in_progress = false; |
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385 RootRegionScan_lock->notify_all(); |
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386 } |
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387 } |
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388 |
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389 bool CMRootRegions::wait_until_scan_finished() { |
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390 if (!scan_in_progress()) return false; |
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391 |
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392 { |
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393 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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394 while (scan_in_progress()) { |
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395 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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396 } |
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397 } |
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398 return true; |
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399 } |
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400 |
| 342 | 401 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 402 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 403 #endif // _MSC_VER | |
| 404 | |
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405 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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406 return MAX2((n_par_threads + 2) / 4, 1U); |
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407 } |
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408 |
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409 ConcurrentMark::ConcurrentMark(ReservedSpace rs, uint max_regions) : |
| 342 | 410 _markBitMap1(rs, MinObjAlignment - 1), |
| 411 _markBitMap2(rs, MinObjAlignment - 1), | |
| 412 | |
| 413 _parallel_marking_threads(0), | |
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414 _max_parallel_marking_threads(0), |
| 342 | 415 _sleep_factor(0.0), |
| 416 _marking_task_overhead(1.0), | |
| 417 _cleanup_sleep_factor(0.0), | |
| 418 _cleanup_task_overhead(1.0), | |
| 2152 | 419 _cleanup_list("Cleanup List"), |
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420 _region_bm((BitMap::idx_t) max_regions, false /* in_resource_area*/), |
| 342 | 421 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> |
| 422 CardTableModRefBS::card_shift, | |
| 423 false /* in_resource_area*/), | |
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424 |
| 342 | 425 _prevMarkBitMap(&_markBitMap1), |
| 426 _nextMarkBitMap(&_markBitMap2), | |
| 427 | |
| 428 _markStack(this), | |
| 429 // _finger set in set_non_marking_state | |
| 430 | |
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431 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 432 // _active_tasks set in set_non_marking_state |
| 433 // _tasks set inside the constructor | |
| 434 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
| 435 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
| 436 | |
| 437 _has_overflown(false), | |
| 438 _concurrent(false), | |
|
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439 _has_aborted(false), |
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440 _restart_for_overflow(false), |
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441 _concurrent_marking_in_progress(false), |
| 342 | 442 |
| 443 // _verbose_level set below | |
| 444 | |
| 445 _init_times(), | |
| 446 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 447 _cleanup_times(), | |
| 448 _total_counting_time(0.0), | |
| 449 _total_rs_scrub_time(0.0), | |
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450 |
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451 _parallel_workers(NULL), |
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452 |
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453 _count_card_bitmaps(NULL), |
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454 _count_marked_bytes(NULL) { |
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455 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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456 if (verbose_level < no_verbose) { |
| 342 | 457 verbose_level = no_verbose; |
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458 } |
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459 if (verbose_level > high_verbose) { |
| 342 | 460 verbose_level = high_verbose; |
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461 } |
| 342 | 462 _verbose_level = verbose_level; |
| 463 | |
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464 if (verbose_low()) { |
| 342 | 465 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
| 466 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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467 } |
| 342 | 468 |
| 1284 | 469 _markStack.allocate(MarkStackSize); |
| 342 | 470 |
| 471 // Create & start a ConcurrentMark thread. | |
|
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472 _cmThread = new ConcurrentMarkThread(this); |
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473 assert(cmThread() != NULL, "CM Thread should have been created"); |
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474 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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475 |
| 342 | 476 _g1h = G1CollectedHeap::heap(); |
| 477 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
| 478 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
| 479 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
| 480 | |
| 481 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 482 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 483 |
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484 _root_regions.init(_g1h, this); |
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485 |
| 6197 | 486 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num, mtGC); |
| 487 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num, mtGC); | |
| 488 | |
| 489 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_task_num, mtGC); | |
| 490 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_task_num, mtGC); | |
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491 |
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492 BitMap::idx_t card_bm_size = _card_bm.size(); |
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493 |
| 342 | 494 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
| 495 _active_tasks = _max_task_num; | |
| 496 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 497 CMTaskQueue* task_queue = new CMTaskQueue(); | |
| 498 task_queue->initialize(); | |
| 499 _task_queues->register_queue(i, task_queue); | |
| 500 | |
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501 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
| 6197 | 502 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, (size_t) max_regions, mtGC); |
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503 |
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504 _tasks[i] = new CMTask(i, this, |
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505 _count_marked_bytes[i], |
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506 &_count_card_bitmaps[i], |
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507 task_queue, _task_queues); |
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508 |
| 342 | 509 _accum_task_vtime[i] = 0.0; |
| 510 } | |
| 511 | |
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512 // Calculate the card number for the bottom of the heap. Used |
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513 // in biasing indexes into the accounting card bitmaps. |
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514 _heap_bottom_card_num = |
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515 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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516 CardTableModRefBS::card_shift); |
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517 |
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518 // Clear all the liveness counting data |
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519 clear_all_count_data(); |
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520 |
| 1284 | 521 if (ConcGCThreads > ParallelGCThreads) { |
| 522 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
| 342 | 523 "than ParallelGCThreads."); |
| 524 } | |
| 525 if (ParallelGCThreads == 0) { | |
| 526 // if we are not running with any parallel GC threads we will not | |
| 527 // spawn any marking threads either | |
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528 _parallel_marking_threads = 0; |
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529 _max_parallel_marking_threads = 0; |
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530 _sleep_factor = 0.0; |
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531 _marking_task_overhead = 1.0; |
| 342 | 532 } else { |
| 1284 | 533 if (ConcGCThreads > 0) { |
| 534 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
| 342 | 535 // if both are set |
| 536 | |
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537 _parallel_marking_threads = (uint) ConcGCThreads; |
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538 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 539 _sleep_factor = 0.0; |
| 540 _marking_task_overhead = 1.0; | |
| 751 | 541 } else if (G1MarkingOverheadPercent > 0) { |
| 342 | 542 // we will calculate the number of parallel marking threads |
| 543 // based on a target overhead with respect to the soft real-time | |
| 544 // goal | |
| 545 | |
| 751 | 546 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 547 double overall_cm_overhead = |
| 751 | 548 (double) MaxGCPauseMillis * marking_overhead / |
| 549 (double) GCPauseIntervalMillis; | |
| 342 | 550 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 551 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 552 double marking_task_overhead = | |
| 553 overall_cm_overhead / marking_thread_num * | |
| 554 (double) os::processor_count(); | |
| 555 double sleep_factor = | |
| 556 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 557 | |
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558 _parallel_marking_threads = (uint) marking_thread_num; |
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559 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 560 _sleep_factor = sleep_factor; |
| 561 _marking_task_overhead = marking_task_overhead; | |
| 562 } else { | |
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563 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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564 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 565 _sleep_factor = 0.0; |
| 566 _marking_task_overhead = 1.0; | |
| 567 } | |
| 568 | |
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569 if (parallel_marking_threads() > 1) { |
| 342 | 570 _cleanup_task_overhead = 1.0; |
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571 } else { |
| 342 | 572 _cleanup_task_overhead = marking_task_overhead(); |
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573 } |
| 342 | 574 _cleanup_sleep_factor = |
| 575 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 576 | |
| 577 #if 0 | |
| 578 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 579 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 580 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 581 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 582 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 583 #endif | |
| 584 | |
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585 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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586 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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587 _max_parallel_marking_threads, false, true); |
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588 if (_parallel_workers == NULL) { |
| 342 | 589 vm_exit_during_initialization("Failed necessary allocation."); |
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590 } else { |
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591 _parallel_workers->initialize_workers(); |
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592 } |
| 342 | 593 } |
| 594 | |
| 595 // so that the call below can read a sensible value | |
| 596 _heap_start = (HeapWord*) rs.base(); | |
| 597 set_non_marking_state(); | |
| 598 } | |
| 599 | |
| 600 void ConcurrentMark::update_g1_committed(bool force) { | |
| 601 // If concurrent marking is not in progress, then we do not need to | |
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602 // update _heap_end. |
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603 if (!concurrent_marking_in_progress() && !force) return; |
| 342 | 604 |
| 605 MemRegion committed = _g1h->g1_committed(); | |
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606 assert(committed.start() == _heap_start, "start shouldn't change"); |
| 342 | 607 HeapWord* new_end = committed.end(); |
| 608 if (new_end > _heap_end) { | |
| 609 // The heap has been expanded. | |
| 610 | |
| 611 _heap_end = new_end; | |
| 612 } | |
| 613 // Notice that the heap can also shrink. However, this only happens | |
| 614 // during a Full GC (at least currently) and the entire marking | |
| 615 // phase will bail out and the task will not be restarted. So, let's | |
| 616 // do nothing. | |
| 617 } | |
| 618 | |
| 619 void ConcurrentMark::reset() { | |
| 620 // Starting values for these two. This should be called in a STW | |
| 621 // phase. CM will be notified of any future g1_committed expansions | |
| 622 // will be at the end of evacuation pauses, when tasks are | |
| 623 // inactive. | |
| 624 MemRegion committed = _g1h->g1_committed(); | |
| 625 _heap_start = committed.start(); | |
| 626 _heap_end = committed.end(); | |
| 627 | |
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628 // Separated the asserts so that we know which one fires. |
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629 assert(_heap_start != NULL, "heap bounds should look ok"); |
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630 assert(_heap_end != NULL, "heap bounds should look ok"); |
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631 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 632 |
| 633 // reset all the marking data structures and any necessary flags | |
| 634 clear_marking_state(); | |
| 635 | |
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636 if (verbose_low()) { |
| 342 | 637 gclog_or_tty->print_cr("[global] resetting"); |
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638 } |
| 342 | 639 |
| 640 // We do reset all of them, since different phases will use | |
| 641 // different number of active threads. So, it's easiest to have all | |
| 642 // of them ready. | |
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643 for (int i = 0; i < (int) _max_task_num; ++i) { |
| 342 | 644 _tasks[i]->reset(_nextMarkBitMap); |
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645 } |
| 342 | 646 |
| 647 // we need this to make sure that the flag is on during the evac | |
| 648 // pause with initial mark piggy-backed | |
| 649 set_concurrent_marking_in_progress(); | |
| 650 } | |
| 651 | |
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652 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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653 assert(active_tasks <= _max_task_num, "we should not have more"); |
| 342 | 654 |
| 655 _active_tasks = active_tasks; | |
| 656 // Need to update the three data structures below according to the | |
| 657 // number of active threads for this phase. | |
| 658 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 659 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 660 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 661 | |
| 662 _concurrent = concurrent; | |
| 663 // We propagate this to all tasks, not just the active ones. | |
| 664 for (int i = 0; i < (int) _max_task_num; ++i) | |
| 665 _tasks[i]->set_concurrent(concurrent); | |
| 666 | |
| 667 if (concurrent) { | |
| 668 set_concurrent_marking_in_progress(); | |
| 669 } else { | |
| 670 // We currently assume that the concurrent flag has been set to | |
| 671 // false before we start remark. At this point we should also be | |
| 672 // in a STW phase. | |
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673 assert(!concurrent_marking_in_progress(), "invariant"); |
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674 assert(_finger == _heap_end, "only way to get here"); |
| 342 | 675 update_g1_committed(true); |
| 676 } | |
| 677 } | |
| 678 | |
| 679 void ConcurrentMark::set_non_marking_state() { | |
| 680 // We set the global marking state to some default values when we're | |
| 681 // not doing marking. | |
| 682 clear_marking_state(); | |
| 683 _active_tasks = 0; | |
| 684 clear_concurrent_marking_in_progress(); | |
| 685 } | |
| 686 | |
| 687 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 688 // The ConcurrentMark instance is never freed. |
| 689 ShouldNotReachHere(); | |
| 342 | 690 } |
| 691 | |
| 692 void ConcurrentMark::clearNextBitmap() { | |
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693 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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694 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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695 |
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696 // Make sure that the concurrent mark thread looks to still be in |
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697 // the current cycle. |
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698 guarantee(cmThread()->during_cycle(), "invariant"); |
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699 |
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700 // We are finishing up the current cycle by clearing the next |
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701 // marking bitmap and getting it ready for the next cycle. During |
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702 // this time no other cycle can start. So, let's make sure that this |
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703 // is the case. |
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704 guarantee(!g1h->mark_in_progress(), "invariant"); |
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705 |
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706 // clear the mark bitmap (no grey objects to start with). |
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707 // We need to do this in chunks and offer to yield in between |
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708 // each chunk. |
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709 HeapWord* start = _nextMarkBitMap->startWord(); |
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710 HeapWord* end = _nextMarkBitMap->endWord(); |
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711 HeapWord* cur = start; |
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712 size_t chunkSize = M; |
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713 while (cur < end) { |
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714 HeapWord* next = cur + chunkSize; |
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715 if (next > end) { |
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716 next = end; |
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717 } |
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718 MemRegion mr(cur,next); |
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719 _nextMarkBitMap->clearRange(mr); |
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720 cur = next; |
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721 do_yield_check(); |
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722 |
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723 // Repeat the asserts from above. We'll do them as asserts here to |
|
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724 // minimize their overhead on the product. However, we'll have |
|
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725 // them as guarantees at the beginning / end of the bitmap |
|
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726 // clearing to get some checking in the product. |
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727 assert(cmThread()->during_cycle(), "invariant"); |
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728 assert(!g1h->mark_in_progress(), "invariant"); |
|
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729 } |
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730 |
|
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731 // Clear the liveness counting data |
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732 clear_all_count_data(); |
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733 |
|
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734 // Repeat the asserts from above. |
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735 guarantee(cmThread()->during_cycle(), "invariant"); |
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736 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 737 } |
| 738 | |
| 739 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
| 740 public: | |
| 741 bool doHeapRegion(HeapRegion* r) { | |
| 742 if (!r->continuesHumongous()) { | |
|
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743 r->note_start_of_marking(); |
| 342 | 744 } |
| 745 return false; | |
| 746 } | |
| 747 }; | |
| 748 | |
| 749 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 750 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 751 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 752 | |
| 753 _has_aborted = false; | |
| 754 | |
|
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755 #ifndef PRODUCT |
| 1044 | 756 if (G1PrintReachableAtInitialMark) { |
| 1388 | 757 print_reachable("at-cycle-start", |
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758 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 759 } |
|
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760 #endif |
| 342 | 761 |
| 762 // Initialise marking structures. This has to be done in a STW phase. | |
| 763 reset(); | |
|
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764 |
|
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765 // For each region note start of marking. |
|
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766 NoteStartOfMarkHRClosure startcl; |
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767 g1h->heap_region_iterate(&startcl); |
| 342 | 768 } |
| 769 | |
| 770 | |
| 771 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 772 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 773 | |
|
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774 // If we force an overflow during remark, the remark operation will |
|
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775 // actually abort and we'll restart concurrent marking. If we always |
|
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776 // force an oveflow during remark we'll never actually complete the |
|
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777 // marking phase. So, we initilize this here, at the start of the |
|
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778 // cycle, so that at the remaining overflow number will decrease at |
|
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779 // every remark and we'll eventually not need to cause one. |
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780 force_overflow_stw()->init(); |
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781 |
|
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782 // Start Concurrent Marking weak-reference discovery. |
|
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783 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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784 // enable ("weak") refs discovery |
|
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785 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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786 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 787 |
| 788 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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789 // This is the start of the marking cycle, we're expected all |
|
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790 // threads to have SATB queues with active set to false. |
|
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791 satb_mq_set.set_active_all_threads(true, /* new active value */ |
|
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792 false /* expected_active */); |
| 342 | 793 |
|
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794 _root_regions.prepare_for_scan(); |
|
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795 |
| 342 | 796 // update_g1_committed() will be called at the end of an evac pause |
| 797 // when marking is on. So, it's also called at the end of the | |
| 798 // initial-mark pause to update the heap end, if the heap expands | |
| 799 // during it. No need to call it here. | |
| 800 } | |
| 801 | |
| 802 /* | |
|
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803 * Notice that in the next two methods, we actually leave the STS |
|
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804 * during the barrier sync and join it immediately afterwards. If we |
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805 * do not do this, the following deadlock can occur: one thread could |
|
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806 * be in the barrier sync code, waiting for the other thread to also |
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807 * sync up, whereas another one could be trying to yield, while also |
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808 * waiting for the other threads to sync up too. |
|
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809 * |
|
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810 * Note, however, that this code is also used during remark and in |
|
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811 * this case we should not attempt to leave / enter the STS, otherwise |
|
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812 * we'll either hit an asseert (debug / fastdebug) or deadlock |
|
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813 * (product). So we should only leave / enter the STS if we are |
|
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814 * operating concurrently. |
|
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815 * |
|
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816 * Because the thread that does the sync barrier has left the STS, it |
|
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817 * is possible to be suspended for a Full GC or an evacuation pause |
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818 * could occur. This is actually safe, since the entering the sync |
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819 * barrier is one of the last things do_marking_step() does, and it |
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820 * doesn't manipulate any data structures afterwards. |
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821 */ |
| 342 | 822 |
| 823 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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824 if (verbose_low()) { |
| 342 | 825 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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826 } |
| 342 | 827 |
|
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828 if (concurrent()) { |
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829 ConcurrentGCThread::stsLeave(); |
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830 } |
| 342 | 831 _first_overflow_barrier_sync.enter(); |
|
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832 if (concurrent()) { |
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833 ConcurrentGCThread::stsJoin(); |
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834 } |
| 342 | 835 // at this point everyone should have synced up and not be doing any |
| 836 // more work | |
| 837 | |
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838 if (verbose_low()) { |
| 342 | 839 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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840 } |
| 342 | 841 |
| 842 // let task 0 do this | |
| 843 if (task_num == 0) { | |
| 844 // task 0 is responsible for clearing the global data structures | |
|
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845 // We should be here because of an overflow. During STW we should |
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846 // not clear the overflow flag since we rely on it being true when |
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847 // we exit this method to abort the pause and restart concurent |
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848 // marking. |
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849 clear_marking_state(concurrent() /* clear_overflow */); |
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850 force_overflow()->update(); |
| 342 | 851 |
|
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852 if (G1Log::fine()) { |
| 342 | 853 gclog_or_tty->date_stamp(PrintGCDateStamps); |
| 854 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 855 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
| 856 } | |
| 857 } | |
| 858 | |
| 859 // after this, each task should reset its own data structures then | |
| 860 // then go into the second barrier | |
| 861 } | |
| 862 | |
| 863 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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864 if (verbose_low()) { |
| 342 | 865 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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866 } |
| 342 | 867 |
|
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868 if (concurrent()) { |
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869 ConcurrentGCThread::stsLeave(); |
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870 } |
| 342 | 871 _second_overflow_barrier_sync.enter(); |
|
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872 if (concurrent()) { |
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873 ConcurrentGCThread::stsJoin(); |
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874 } |
| 342 | 875 // at this point everything should be re-initialised and ready to go |
| 876 | |
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877 if (verbose_low()) { |
| 342 | 878 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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879 } |
| 342 | 880 } |
| 881 | |
|
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882 #ifndef PRODUCT |
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883 void ForceOverflowSettings::init() { |
|
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884 _num_remaining = G1ConcMarkForceOverflow; |
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885 _force = false; |
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886 update(); |
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887 } |
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888 |
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889 void ForceOverflowSettings::update() { |
|
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890 if (_num_remaining > 0) { |
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891 _num_remaining -= 1; |
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892 _force = true; |
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893 } else { |
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894 _force = false; |
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895 } |
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896 } |
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897 |
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898 bool ForceOverflowSettings::should_force() { |
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899 if (_force) { |
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900 _force = false; |
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901 return true; |
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902 } else { |
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903 return false; |
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904 } |
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905 } |
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906 #endif // !PRODUCT |
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907 |
| 342 | 908 class CMConcurrentMarkingTask: public AbstractGangTask { |
| 909 private: | |
| 910 ConcurrentMark* _cm; | |
| 911 ConcurrentMarkThread* _cmt; | |
| 912 | |
| 913 public: | |
|
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914 void work(uint worker_id) { |
|
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915 assert(Thread::current()->is_ConcurrentGC_thread(), |
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916 "this should only be done by a conc GC thread"); |
|
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917 ResourceMark rm; |
| 342 | 918 |
| 919 double start_vtime = os::elapsedVTime(); | |
| 920 | |
| 921 ConcurrentGCThread::stsJoin(); | |
| 922 | |
|
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923 assert(worker_id < _cm->active_tasks(), "invariant"); |
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924 CMTask* the_task = _cm->task(worker_id); |
| 342 | 925 the_task->record_start_time(); |
| 926 if (!_cm->has_aborted()) { | |
| 927 do { | |
| 928 double start_vtime_sec = os::elapsedVTime(); | |
| 929 double start_time_sec = os::elapsedTime(); | |
|
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930 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
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931 |
|
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932 the_task->do_marking_step(mark_step_duration_ms, |
|
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933 true /* do_stealing */, |
|
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934 true /* do_termination */); |
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935 |
| 342 | 936 double end_time_sec = os::elapsedTime(); |
| 937 double end_vtime_sec = os::elapsedVTime(); | |
| 938 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 939 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 940 _cm->clear_has_overflown(); | |
| 941 | |
|
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942 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 943 |
| 944 jlong sleep_time_ms; | |
| 945 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 946 sleep_time_ms = | |
| 947 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 948 ConcurrentGCThread::stsLeave(); | |
| 949 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 950 ConcurrentGCThread::stsJoin(); | |
| 951 } | |
| 952 double end_time2_sec = os::elapsedTime(); | |
| 953 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 954 | |
| 955 #if 0 | |
| 956 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 957 "overhead %1.4lf", | |
| 958 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 959 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 960 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 961 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 962 #endif | |
| 963 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 964 } | |
| 965 the_task->record_end_time(); | |
|
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966 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 967 |
| 968 ConcurrentGCThread::stsLeave(); | |
| 969 | |
| 970 double end_vtime = os::elapsedVTime(); | |
|
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971 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 972 } |
| 973 | |
| 974 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 975 ConcurrentMarkThread* cmt) : | |
| 976 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 977 | |
| 978 ~CMConcurrentMarkingTask() { } | |
| 979 }; | |
| 980 | |
|
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981 // Calculates the number of active workers for a concurrent |
|
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982 // phase. |
|
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983 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 984 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
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985 uint n_conc_workers = 0; |
|
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986 if (!UseDynamicNumberOfGCThreads || |
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987 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
|
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988 !ForceDynamicNumberOfGCThreads)) { |
|
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989 n_conc_workers = max_parallel_marking_threads(); |
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990 } else { |
|
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991 n_conc_workers = |
|
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992 AdaptiveSizePolicy::calc_default_active_workers( |
|
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993 max_parallel_marking_threads(), |
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994 1, /* Minimum workers */ |
|
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995 parallel_marking_threads(), |
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996 Threads::number_of_non_daemon_threads()); |
|
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997 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
|
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998 // that scaling has already gone into "_max_parallel_marking_threads". |
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999 } |
| 4711 | 1000 assert(n_conc_workers > 0, "Always need at least 1"); |
| 1001 return n_conc_workers; | |
|
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1002 } |
| 4711 | 1003 // If we are not running with any parallel GC threads we will not |
| 1004 // have spawned any marking threads either. Hence the number of | |
| 1005 // concurrent workers should be 0. | |
| 1006 return 0; | |
|
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1007 } |
|
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1008 |
|
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1009 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
|
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1010 // Currently, only survivors can be root regions. |
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1011 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
|
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1012 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1013 |
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1014 const uintx interval = PrefetchScanIntervalInBytes; |
|
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1015 HeapWord* curr = hr->bottom(); |
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1016 const HeapWord* end = hr->top(); |
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1017 while (curr < end) { |
|
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1018 Prefetch::read(curr, interval); |
|
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1019 oop obj = oop(curr); |
|
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1020 int size = obj->oop_iterate(&cl); |
|
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1021 assert(size == obj->size(), "sanity"); |
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1022 curr += size; |
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1023 } |
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1024 } |
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1025 |
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1026 class CMRootRegionScanTask : public AbstractGangTask { |
|
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1027 private: |
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1028 ConcurrentMark* _cm; |
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1029 |
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1030 public: |
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1031 CMRootRegionScanTask(ConcurrentMark* cm) : |
|
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1032 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1033 |
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1034 void work(uint worker_id) { |
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1035 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1036 "this should only be done by a conc GC thread"); |
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1037 |
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1038 CMRootRegions* root_regions = _cm->root_regions(); |
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1039 HeapRegion* hr = root_regions->claim_next(); |
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1040 while (hr != NULL) { |
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1041 _cm->scanRootRegion(hr, worker_id); |
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1042 hr = root_regions->claim_next(); |
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1043 } |
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1044 } |
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1045 }; |
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1046 |
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1047 void ConcurrentMark::scanRootRegions() { |
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1048 // scan_in_progress() will have been set to true only if there was |
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1049 // at least one root region to scan. So, if it's false, we |
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1050 // should not attempt to do any further work. |
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1051 if (root_regions()->scan_in_progress()) { |
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1052 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1053 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1054 "Maximum number of marking threads exceeded"); |
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1055 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1056 |
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1057 CMRootRegionScanTask task(this); |
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1058 if (parallel_marking_threads() > 0) { |
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1059 _parallel_workers->set_active_workers((int) active_workers); |
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1060 _parallel_workers->run_task(&task); |
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1061 } else { |
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1062 task.work(0); |
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1063 } |
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1064 |
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1065 // It's possible that has_aborted() is true here without actually |
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1066 // aborting the survivor scan earlier. This is OK as it's |
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1067 // mainly used for sanity checking. |
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1068 root_regions()->scan_finished(); |
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1069 } |
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1070 } |
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1071 |
| 342 | 1072 void ConcurrentMark::markFromRoots() { |
| 1073 // we might be tempted to assert that: | |
| 1074 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1075 // "inconsistent argument?"); | |
| 1076 // However that wouldn't be right, because it's possible that | |
| 1077 // a safepoint is indeed in progress as a younger generation | |
| 1078 // stop-the-world GC happens even as we mark in this generation. | |
| 1079 | |
| 1080 _restart_for_overflow = false; | |
|
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1081 force_overflow_conc()->init(); |
|
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1082 |
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1083 // _g1h has _n_par_threads |
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1084 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1085 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1086 "Maximum number of marking threads exceeded"); |
| 4711 | 1087 |
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1088 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1089 |
| 1090 // Parallel task terminator is set in "set_phase()" | |
| 1091 set_phase(active_workers, true /* concurrent */); | |
| 342 | 1092 |
| 1093 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1094 if (parallel_marking_threads() > 0) { |
| 4711 | 1095 _parallel_workers->set_active_workers((int)active_workers); |
| 1096 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
| 1097 // and the decisions on that MT processing is made elsewhere. | |
| 1098 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1099 _parallel_workers->run_task(&markingTask); |
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1100 } else { |
| 342 | 1101 markingTask.work(0); |
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1102 } |
| 342 | 1103 print_stats(); |
| 1104 } | |
| 1105 | |
| 1106 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1107 // world is stopped at this checkpoint | |
| 1108 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1109 "world should be stopped"); | |
|
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1110 |
| 342 | 1111 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1112 | |
| 1113 // If a full collection has happened, we shouldn't do this. | |
| 1114 if (has_aborted()) { | |
| 1115 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1116 return; | |
| 1117 } | |
| 1118 | |
|
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1119 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1120 |
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1121 if (VerifyDuringGC) { |
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1122 HandleMark hm; // handle scope |
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1123 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1124 Universe::heap()->prepare_for_verify(); |
| 6008 | 1125 Universe::verify(/* silent */ false, |
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1126 /* option */ VerifyOption_G1UsePrevMarking); |
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1127 } |
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1128 |
| 342 | 1129 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1130 g1p->record_concurrent_mark_remark_start(); | |
| 1131 | |
| 1132 double start = os::elapsedTime(); | |
| 1133 | |
| 1134 checkpointRootsFinalWork(); | |
| 1135 | |
| 1136 double mark_work_end = os::elapsedTime(); | |
| 1137 | |
| 1138 weakRefsWork(clear_all_soft_refs); | |
| 1139 | |
| 1140 if (has_overflown()) { | |
| 1141 // Oops. We overflowed. Restart concurrent marking. | |
| 1142 _restart_for_overflow = true; | |
| 1143 // Clear the flag. We do not need it any more. | |
| 1144 clear_has_overflown(); | |
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1145 if (G1TraceMarkStackOverflow) { |
| 342 | 1146 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1147 } |
| 342 | 1148 } else { |
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1149 // Aggregate the per-task counting data that we have accumulated |
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1150 // while marking. |
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1151 aggregate_count_data(); |
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1152 |
| 2149 | 1153 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1154 // We're done with marking. |
|
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1155 // This is the end of the marking cycle, we're expected all |
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1156 // threads to have SATB queues with active set to true. |
| 2149 | 1157 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1158 true /* expected_active */); | |
| 811 | 1159 |
| 1160 if (VerifyDuringGC) { | |
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1161 HandleMark hm; // handle scope |
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1162 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1163 Universe::heap()->prepare_for_verify(); |
| 6008 | 1164 Universe::verify(/* silent */ false, |
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1165 /* option */ VerifyOption_G1UseNextMarking); |
| 811 | 1166 } |
|
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1167 assert(!restart_for_overflow(), "sanity"); |
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1168 } |
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1169 |
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1170 // Reset the marking state if marking completed |
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1171 if (!restart_for_overflow()) { |
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1172 set_non_marking_state(); |
| 342 | 1173 } |
| 1174 | |
| 1175 #if VERIFY_OBJS_PROCESSED | |
| 1176 _scan_obj_cl.objs_processed = 0; | |
| 1177 ThreadLocalObjQueue::objs_enqueued = 0; | |
| 1178 #endif | |
| 1179 | |
| 1180 // Statistics | |
| 1181 double now = os::elapsedTime(); | |
| 1182 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1183 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1184 _remark_times.add((now - start) * 1000.0); | |
| 1185 | |
| 1186 g1p->record_concurrent_mark_remark_end(); | |
| 1187 } | |
| 1188 | |
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1189 // Base class of the closures that finalize and verify the |
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1190 // liveness counting data. |
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1191 class CMCountDataClosureBase: public HeapRegionClosure { |
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1192 protected: |
| 342 | 1193 ConcurrentMark* _cm; |
| 1194 BitMap* _region_bm; | |
| 1195 BitMap* _card_bm; | |
|
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1196 |
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1197 void set_card_bitmap_range(BitMap::idx_t start_idx, BitMap::idx_t last_idx) { |
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1198 assert(start_idx <= last_idx, "sanity"); |
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1199 |
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1200 // Set the inclusive bit range [start_idx, last_idx]. |
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1201 // For small ranges (up to 8 cards) use a simple loop; otherwise |
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1202 // use par_at_put_range. |
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1203 if ((last_idx - start_idx) < 8) { |
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1204 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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1205 _card_bm->par_set_bit(i); |
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1206 } |
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1207 } else { |
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1208 assert(last_idx < _card_bm->size(), "sanity"); |
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1209 // Note BitMap::par_at_put_range() is exclusive. |
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1210 _card_bm->par_at_put_range(start_idx, last_idx+1, true); |
| 342 | 1211 } |
| 1212 } | |
| 1213 | |
| 829 | 1214 // It takes a region that's not empty (i.e., it has at least one |
| 1215 // live object in it and sets its corresponding bit on the region | |
| 1216 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1217 // to 1 the bits on the region bitmap that correspond to its | |
| 1218 // associated "continues humongous" regions. | |
| 1219 void set_bit_for_region(HeapRegion* hr) { | |
| 1220 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1221 | |
|
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1222 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
| 829 | 1223 if (!hr->startsHumongous()) { |
| 1224 // Normal (non-humongous) case: just set the bit. | |
|
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1225 _region_bm->par_at_put(index, true); |
| 829 | 1226 } else { |
| 1227 // Starts humongous case: calculate how many regions are part of | |
|
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1228 // this humongous region and then set the bit range. |
|
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1229 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
|
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1230 _region_bm->par_at_put_range(index, end_index, true); |
| 829 | 1231 } |
| 1232 } | |
| 1233 | |
|
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1234 public: |
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1235 CMCountDataClosureBase(ConcurrentMark *cm, |
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1236 BitMap* region_bm, BitMap* card_bm): |
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1237 _cm(cm), _region_bm(region_bm), _card_bm(card_bm) { } |
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1238 }; |
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1239 |
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1240 // Closure that calculates the # live objects per region. Used |
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1241 // for verification purposes during the cleanup pause. |
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1242 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1243 CMBitMapRO* _bm; |
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1244 size_t _region_marked_bytes; |
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1245 |
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1246 public: |
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1247 CalcLiveObjectsClosure(CMBitMapRO *bm, ConcurrentMark *cm, |
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1248 BitMap* region_bm, BitMap* card_bm) : |
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1249 CMCountDataClosureBase(cm, region_bm, card_bm), |
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1250 _bm(bm), _region_marked_bytes(0) { } |
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1251 |
| 342 | 1252 bool doHeapRegion(HeapRegion* hr) { |
| 1253 | |
| 639 | 1254 if (hr->continuesHumongous()) { |
| 829 | 1255 // We will ignore these here and process them when their |
| 1256 // associated "starts humongous" region is processed (see | |
| 1257 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1258 // associated "starts humongous" region to have their bit set to | |
| 1259 // 1 since, due to the region chunking in the parallel region | |
| 1260 // iteration, a "continues humongous" region might be visited | |
| 1261 // before its associated "starts humongous". | |
| 639 | 1262 return false; |
| 1263 } | |
| 342 | 1264 |
| 1265 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
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1266 HeapWord* start = hr->bottom(); |
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1267 |
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1268 assert(start <= hr->end() && start <= nextTop && nextTop <= hr->end(), |
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1269 err_msg("Preconditions not met - " |
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1270 "start: "PTR_FORMAT", nextTop: "PTR_FORMAT", end: "PTR_FORMAT, |
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1271 start, nextTop, hr->end())); |
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1272 |
| 342 | 1273 // Find the first marked object at or after "start". |
| 1274 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
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1275 |
| 342 | 1276 size_t marked_bytes = 0; |
| 1277 | |
| 1278 while (start < nextTop) { | |
| 1279 oop obj = oop(start); | |
| 1280 int obj_sz = obj->size(); | |
| 1281 HeapWord* obj_last = start + obj_sz - 1; | |
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1282 |
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1283 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1284 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(obj_last); |
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1285 |
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1286 // Set the bits in the card BM for this object (inclusive). |
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1287 set_card_bitmap_range(start_idx, last_idx); |
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1288 |
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1289 // Add the size of this object to the number of marked bytes. |
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1290 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1291 |
| 342 | 1292 // Find the next marked object after this one. |
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1293 start = _bm->getNextMarkedWordAddress(obj_last + 1, nextTop); |
|
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1294 } |
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1295 |
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1296 // Mark the allocated-since-marking portion... |
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1297 HeapWord* top = hr->top(); |
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1298 if (nextTop < top) { |
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1299 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(nextTop); |
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1300 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top - 1); |
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1301 |
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1302 set_card_bitmap_range(start_idx, last_idx); |
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1303 |
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1304 // This definitely means the region has live objects. |
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1305 set_bit_for_region(hr); |
| 342 | 1306 } |
| 1307 | |
| 1308 // Update the live region bitmap. | |
| 1309 if (marked_bytes > 0) { | |
| 829 | 1310 set_bit_for_region(hr); |
| 342 | 1311 } |
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1312 |
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1313 // Set the marked bytes for the current region so that |
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1314 // it can be queried by a calling verificiation routine |
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1315 _region_marked_bytes = marked_bytes; |
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1316 |
| 342 | 1317 return false; |
| 1318 } | |
| 1319 | |
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1320 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1321 }; |
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1322 |
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1323 // Heap region closure used for verifying the counting data |
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1324 // that was accumulated concurrently and aggregated during |
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1325 // the remark pause. This closure is applied to the heap |
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1326 // regions during the STW cleanup pause. |
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1327 |
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1328 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1329 ConcurrentMark* _cm; |
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1330 CalcLiveObjectsClosure _calc_cl; |
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1331 BitMap* _region_bm; // Region BM to be verified |
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1332 BitMap* _card_bm; // Card BM to be verified |
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1333 bool _verbose; // verbose output? |
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1334 |
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1335 BitMap* _exp_region_bm; // Expected Region BM values |
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1336 BitMap* _exp_card_bm; // Expected card BM values |
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1337 |
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1338 int _failures; |
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1339 |
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1340 public: |
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1341 VerifyLiveObjectDataHRClosure(ConcurrentMark* cm, |
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1342 BitMap* region_bm, |
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1343 BitMap* card_bm, |
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1344 BitMap* exp_region_bm, |
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1345 BitMap* exp_card_bm, |
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1346 bool verbose) : |
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1347 _cm(cm), |
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1348 _calc_cl(_cm->nextMarkBitMap(), _cm, exp_region_bm, exp_card_bm), |
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1349 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1350 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1351 _failures(0) { } |
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1352 |
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1353 int failures() const { return _failures; } |
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1354 |
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1355 bool doHeapRegion(HeapRegion* hr) { |
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1356 if (hr->continuesHumongous()) { |
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1357 // We will ignore these here and process them when their |
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1358 // associated "starts humongous" region is processed (see |
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1359 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1360 // associated "starts humongous" region to have their bit set to |
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1361 // 1 since, due to the region chunking in the parallel region |
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1362 // iteration, a "continues humongous" region might be visited |
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1363 // before its associated "starts humongous". |
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1364 return false; |
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1365 } |
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1366 |
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1367 int failures = 0; |
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1368 |
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1369 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1370 // this region and set the corresponding bits in the expected region |
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1371 // and card bitmaps. |
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1372 bool res = _calc_cl.doHeapRegion(hr); |
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1373 assert(res == false, "should be continuing"); |
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1374 |
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1375 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1376 Mutex::_no_safepoint_check_flag); |
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1377 |
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1378 // Verify the marked bytes for this region. |
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1379 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1380 size_t act_marked_bytes = hr->next_marked_bytes(); |
|
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1381 |
|
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1382 // We're not OK if expected marked bytes > actual marked bytes. It means |
|
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1383 // we have missed accounting some objects during the actual marking. |
|
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1384 if (exp_marked_bytes > act_marked_bytes) { |
|
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1385 if (_verbose) { |
|
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1386 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
|
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1387 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
|
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1388 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
|
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1389 } |
|
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|
1390 failures += 1; |
|
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|
1391 } |
|
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|
1392 |
|
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1393 // Verify the bit, for this region, in the actual and expected |
|
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1394 // (which was just calculated) region bit maps. |
|
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1395 // We're not OK if the bit in the calculated expected region |
|
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1396 // bitmap is set and the bit in the actual region bitmap is not. |
|
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1397 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
|
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|
1398 |
|
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|
1399 bool expected = _exp_region_bm->at(index); |
|
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1400 bool actual = _region_bm->at(index); |
|
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1401 if (expected && !actual) { |
|
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1402 if (_verbose) { |
|
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1403 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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1404 "expected: %s, actual: %s", |
|
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1405 hr->hrs_index(), |
|
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1406 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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1407 } |
|
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1408 failures += 1; |
|
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|
1409 } |
|
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|
1410 |
|
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|
1411 // Verify that the card bit maps for the cards spanned by the current |
|
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1412 // region match. We have an error if we have a set bit in the expected |
|
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1413 // bit map and the corresponding bit in the actual bitmap is not set. |
|
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|
1414 |
|
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|
1415 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
|
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1416 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
|
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|
1417 |
|
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1418 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
|
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1419 expected = _exp_card_bm->at(i); |
|
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1420 actual = _card_bm->at(i); |
|
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|
1421 |
|
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1422 if (expected && !actual) { |
|
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|
1423 if (_verbose) { |
|
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|
1424 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
|
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|
1425 "expected: %s, actual: %s", |
|
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|
1426 hr->hrs_index(), i, |
|
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|
1427 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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|
1428 } |
|
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|
1429 failures += 1; |
|
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|
1430 } |
|
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|
1431 } |
|
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|
1432 |
|
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|
1433 if (failures > 0 && _verbose) { |
|
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|
1434 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
|
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|
1435 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
|
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|
1436 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
|
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|
1437 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
|
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|
1438 } |
|
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|
1439 |
|
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|
1440 _failures += failures; |
|
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|
1441 |
|
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|
1442 // We could stop iteration over the heap when we |
|
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1443 // find the first violating region by returning true. |
|
4836
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|
1444 return false; |
|
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|
1445 } |
| 342 | 1446 }; |
| 1447 | |
| 1448 | |
|
4836
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|
1449 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
|
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|
1450 protected: |
|
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|
1451 G1CollectedHeap* _g1h; |
|
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|
1452 ConcurrentMark* _cm; |
|
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|
1453 BitMap* _actual_region_bm; |
|
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|
1454 BitMap* _actual_card_bm; |
|
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|
1455 |
|
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|
1456 uint _n_workers; |
|
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|
1457 |
|
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|
1458 BitMap* _expected_region_bm; |
|
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|
1459 BitMap* _expected_card_bm; |
|
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|
1460 |
|
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|
1461 int _failures; |
|
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changeset
|
1462 bool _verbose; |
|
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|
1463 |
|
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|
1464 public: |
|
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changeset
|
1465 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
|
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|
1466 BitMap* region_bm, BitMap* card_bm, |
|
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|
1467 BitMap* expected_region_bm, BitMap* expected_card_bm) |
|
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|
1468 : AbstractGangTask("G1 verify final counting"), |
|
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|
1469 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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|
1470 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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changeset
|
1471 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
|
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|
1472 _failures(0), _verbose(false), |
|
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|
1473 _n_workers(0) { |
|
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|
1474 assert(VerifyDuringGC, "don't call this otherwise"); |
|
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|
1475 |
|
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changeset
|
1476 // Use the value already set as the number of active threads |
|
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|
1477 // in the call to run_task(). |
|
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|
1478 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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changeset
|
1479 assert( _g1h->workers()->active_workers() > 0, |
|
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changeset
|
1480 "Should have been previously set"); |
|
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|
1481 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1482 } else { |
|
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|
1483 _n_workers = 1; |
|
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|
1484 } |
|
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changeset
|
1485 |
|
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changeset
|
1486 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
|
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changeset
|
1487 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
|
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|
1488 |
|
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changeset
|
1489 _verbose = _cm->verbose_medium(); |
|
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|
1490 } |
|
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changeset
|
1491 |
|
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changeset
|
1492 void work(uint worker_id) { |
|
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changeset
|
1493 assert(worker_id < _n_workers, "invariant"); |
|
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|
1494 |
|
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changeset
|
1495 VerifyLiveObjectDataHRClosure verify_cl(_cm, |
|
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changeset
|
1496 _actual_region_bm, _actual_card_bm, |
|
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changeset
|
1497 _expected_region_bm, |
|
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changeset
|
1498 _expected_card_bm, |
|
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changeset
|
1499 _verbose); |
|
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diff
changeset
|
1500 |
|
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changeset
|
1501 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1502 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
|
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1503 worker_id, |
|
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|
1504 _n_workers, |
|
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|
1505 HeapRegion::VerifyCountClaimValue); |
|
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1506 } else { |
|
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|
1507 _g1h->heap_region_iterate(&verify_cl); |
|
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|
1508 } |
|
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|
1509 |
|
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|
1510 Atomic::add(verify_cl.failures(), &_failures); |
|
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1511 } |
|
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|
1512 |
|
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|
1513 int failures() const { return _failures; } |
|
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1514 }; |
|
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1515 |
|
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1516 // Closure that finalizes the liveness counting data. |
|
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1517 // Used during the cleanup pause. |
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1518 // Sets the bits corresponding to the interval [NTAMS, top] |
|
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1519 // (which contains the implicitly live objects) in the |
|
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1520 // card liveness bitmap. Also sets the bit for each region, |
|
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1521 // containing live data, in the region liveness bitmap. |
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1522 |
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1523 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
|
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1524 public: |
|
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1525 FinalCountDataUpdateClosure(ConcurrentMark* cm, |
|
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1526 BitMap* region_bm, |
|
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1527 BitMap* card_bm) : |
|
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1528 CMCountDataClosureBase(cm, region_bm, card_bm) { } |
|
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1529 |
|
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|
1530 bool doHeapRegion(HeapRegion* hr) { |
|
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1531 |
|
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1532 if (hr->continuesHumongous()) { |
|
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1533 // We will ignore these here and process them when their |
|
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1534 // associated "starts humongous" region is processed (see |
|
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1535 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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1536 // associated "starts humongous" region to have their bit set to |
|
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1537 // 1 since, due to the region chunking in the parallel region |
|
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1538 // iteration, a "continues humongous" region might be visited |
|
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1539 // before its associated "starts humongous". |
|
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|
1540 return false; |
|
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|
1541 } |
|
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|
1542 |
|
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|
1543 HeapWord* ntams = hr->next_top_at_mark_start(); |
|
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1544 HeapWord* top = hr->top(); |
|
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1545 |
|
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1546 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
|
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1547 |
|
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|
1548 // Mark the allocated-since-marking portion... |
|
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1549 if (ntams < top) { |
|
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1550 // This definitely means the region has live objects. |
|
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1551 set_bit_for_region(hr); |
|
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|
1552 } |
|
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|
1553 |
|
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|
1554 // Now set the bits for [ntams, top] |
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|
1555 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
|
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|
1556 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top); |
|
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|
1557 set_card_bitmap_range(start_idx, last_idx); |
|
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|
1558 |
|
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|
1559 // Set the bit for the region if it contains live data |
|
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1560 if (hr->next_marked_bytes() > 0) { |
|
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|
1561 set_bit_for_region(hr); |
|
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|
1562 } |
|
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|
1563 |
|
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|
1564 return false; |
|
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|
1565 } |
|
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|
1566 }; |
| 342 | 1567 |
| 1568 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1569 protected: | |
| 1570 G1CollectedHeap* _g1h; | |
|
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|
1571 ConcurrentMark* _cm; |
|
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|
1572 BitMap* _actual_region_bm; |
|
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|
1573 BitMap* _actual_card_bm; |
|
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|
1574 |
|
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|
1575 uint _n_workers; |
|
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|
1576 |
| 342 | 1577 public: |
|
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|
1578 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
|
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|
1579 : AbstractGangTask("G1 final counting"), |
|
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|
1580 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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|
1581 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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|
1582 _n_workers(0) { |
|
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|
1583 // Use the value already set as the number of active threads |
| 6011 | 1584 // in the call to run_task(). |
|
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|
1585 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1586 assert( _g1h->workers()->active_workers() > 0, |
|
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|
1587 "Should have been previously set"); |
|
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|
1588 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1589 } else { |
| 342 | 1590 _n_workers = 1; |
|
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|
1591 } |
| 342 | 1592 } |
| 1593 | |
|
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|
1594 void work(uint worker_id) { |
|
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|
1595 assert(worker_id < _n_workers, "invariant"); |
|
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|
1596 |
|
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|
1597 FinalCountDataUpdateClosure final_update_cl(_cm, |
|
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|
1598 _actual_region_bm, |
|
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|
1599 _actual_card_bm); |
|
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|
1600 |
|
1833
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|
1601 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1602 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
|
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|
1603 worker_id, |
|
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|
1604 _n_workers, |
| 355 | 1605 HeapRegion::FinalCountClaimValue); |
| 342 | 1606 } else { |
|
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|
1607 _g1h->heap_region_iterate(&final_update_cl); |
| 342 | 1608 } |
| 1609 } | |
| 1610 }; | |
| 1611 | |
| 1612 class G1ParNoteEndTask; | |
| 1613 | |
| 1614 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1615 G1CollectedHeap* _g1; | |
| 1616 int _worker_num; | |
| 1617 size_t _max_live_bytes; | |
|
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|
1618 uint _regions_claimed; |
| 342 | 1619 size_t _freed_bytes; |
| 2173 | 1620 FreeRegionList* _local_cleanup_list; |
| 4072 | 1621 OldRegionSet* _old_proxy_set; |
| 2173 | 1622 HumongousRegionSet* _humongous_proxy_set; |
| 1623 HRRSCleanupTask* _hrrs_cleanup_task; | |
| 342 | 1624 double _claimed_region_time; |
| 1625 double _max_region_time; | |
| 1626 | |
| 1627 public: | |
| 1628 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1629 int worker_num, |
| 1630 FreeRegionList* local_cleanup_list, | |
| 4072 | 1631 OldRegionSet* old_proxy_set, |
| 2173 | 1632 HumongousRegionSet* humongous_proxy_set, |
|
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|
1633 HRRSCleanupTask* hrrs_cleanup_task) : |
|
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|
1634 _g1(g1), _worker_num(worker_num), |
|
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|
1635 _max_live_bytes(0), _regions_claimed(0), |
|
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|
1636 _freed_bytes(0), |
|
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|
1637 _claimed_region_time(0.0), _max_region_time(0.0), |
|
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|
1638 _local_cleanup_list(local_cleanup_list), |
|
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|
1639 _old_proxy_set(old_proxy_set), |
|
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|
1640 _humongous_proxy_set(humongous_proxy_set), |
|
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|
1641 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
|
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|
1642 |
| 342 | 1643 size_t freed_bytes() { return _freed_bytes; } |
| 1644 | |
|
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|
1645 bool doHeapRegion(HeapRegion *hr) { |
|
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|
1646 if (hr->continuesHumongous()) { |
|
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|
1647 return false; |
|
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1648 } |
|
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1649 // We use a claim value of zero here because all regions |
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1650 // were claimed with value 1 in the FinalCount task. |
|
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1651 _g1->reset_gc_time_stamps(hr); |
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1652 double start = os::elapsedTime(); |
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1653 _regions_claimed++; |
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1654 hr->note_end_of_marking(); |
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1655 _max_live_bytes += hr->max_live_bytes(); |
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1656 _g1->free_region_if_empty(hr, |
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1657 &_freed_bytes, |
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1658 _local_cleanup_list, |
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1659 _old_proxy_set, |
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1660 _humongous_proxy_set, |
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1661 _hrrs_cleanup_task, |
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1662 true /* par */); |
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1663 double region_time = (os::elapsedTime() - start); |
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1664 _claimed_region_time += region_time; |
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1665 if (region_time > _max_region_time) { |
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1666 _max_region_time = region_time; |
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1667 } |
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1668 return false; |
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1669 } |
| 342 | 1670 |
| 1671 size_t max_live_bytes() { return _max_live_bytes; } | |
|
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1672 uint regions_claimed() { return _regions_claimed; } |
| 342 | 1673 double claimed_region_time_sec() { return _claimed_region_time; } |
| 1674 double max_region_time_sec() { return _max_region_time; } | |
| 1675 }; | |
| 1676 | |
| 1677 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1678 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1679 |
| 342 | 1680 protected: |
| 1681 G1CollectedHeap* _g1h; | |
| 1682 size_t _max_live_bytes; | |
| 1683 size_t _freed_bytes; | |
| 2152 | 1684 FreeRegionList* _cleanup_list; |
| 1685 | |
| 342 | 1686 public: |
| 1687 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1688 FreeRegionList* cleanup_list) : |
| 342 | 1689 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1690 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1691 |
|
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1692 void work(uint worker_id) { |
| 342 | 1693 double start = os::elapsedTime(); |
| 2173 | 1694 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 4072 | 1695 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
| 2173 | 1696 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
| 1697 HRRSCleanupTask hrrs_cleanup_task; | |
|
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1698 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
| 4072 | 1699 &old_proxy_set, |
| 2173 | 1700 &humongous_proxy_set, |
| 1701 &hrrs_cleanup_task); | |
|
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1702 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1703 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
|
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1704 _g1h->workers()->active_workers(), |
| 355 | 1705 HeapRegion::NoteEndClaimValue); |
| 342 | 1706 } else { |
| 1707 _g1h->heap_region_iterate(&g1_note_end); | |
| 1708 } | |
| 1709 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1710 | |
| 2152 | 1711 // Now update the lists |
| 1712 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
| 1713 NULL /* free_list */, | |
| 4072 | 1714 &old_proxy_set, |
| 2173 | 1715 &humongous_proxy_set, |
| 2152 | 1716 true /* par */); |
| 342 | 1717 { |
| 1718 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 1719 _max_live_bytes += g1_note_end.max_live_bytes(); | |
| 1720 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1721 |
|
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1722 // If we iterate over the global cleanup list at the end of |
|
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1723 // cleanup to do this printing we will not guarantee to only |
|
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1724 // generate output for the newly-reclaimed regions (the list |
|
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1725 // might not be empty at the beginning of cleanup; we might |
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1726 // still be working on its previous contents). So we do the |
|
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1727 // printing here, before we append the new regions to the global |
|
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1728 // cleanup list. |
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1729 |
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1730 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
|
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1731 if (hr_printer->is_active()) { |
|
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1732 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1733 while (iter.more_available()) { |
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1734 HeapRegion* hr = iter.get_next(); |
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1735 hr_printer->cleanup(hr); |
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1736 } |
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1737 } |
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1738 |
| 2173 | 1739 _cleanup_list->add_as_tail(&local_cleanup_list); |
| 1740 assert(local_cleanup_list.is_empty(), "post-condition"); | |
| 1741 | |
| 1742 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1743 } |
| 1744 } | |
| 1745 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1746 size_t freed_bytes() { return _freed_bytes; } | |
| 1747 }; | |
| 1748 | |
| 1749 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 1750 protected: | |
| 1751 G1RemSet* _g1rs; | |
| 1752 BitMap* _region_bm; | |
| 1753 BitMap* _card_bm; | |
| 1754 public: | |
| 1755 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 1756 BitMap* region_bm, BitMap* card_bm) : | |
| 1757 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
|
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1758 _region_bm(region_bm), _card_bm(card_bm) { } |
| 342 | 1759 |
|
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1760 void work(uint worker_id) { |
|
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1761 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1762 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 1763 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 1764 } else { |
| 1765 _g1rs->scrub(_region_bm, _card_bm); | |
| 1766 } | |
| 1767 } | |
| 1768 | |
| 1769 }; | |
| 1770 | |
| 1771 void ConcurrentMark::cleanup() { | |
| 1772 // world is stopped at this checkpoint | |
| 1773 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1774 "world should be stopped"); | |
| 1775 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1776 | |
| 1777 // If a full collection has happened, we shouldn't do this. | |
| 1778 if (has_aborted()) { | |
| 1779 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1780 return; | |
| 1781 } | |
| 1782 | |
| 4072 | 1783 HRSPhaseSetter x(HRSPhaseCleanup); |
| 2152 | 1784 g1h->verify_region_sets_optional(); |
| 1785 | |
|
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1786 if (VerifyDuringGC) { |
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1787 HandleMark hm; // handle scope |
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1788 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1789 Universe::heap()->prepare_for_verify(); |
| 6008 | 1790 Universe::verify(/* silent */ false, |
|
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1791 /* option */ VerifyOption_G1UsePrevMarking); |
|
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1792 } |
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1793 |
| 342 | 1794 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 1795 g1p->record_concurrent_mark_cleanup_start(); | |
| 1796 | |
| 1797 double start = os::elapsedTime(); | |
| 1798 | |
| 2173 | 1799 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 1800 | |
|
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1801 uint n_workers; |
|
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1802 |
| 342 | 1803 // Do counting once more with the world stopped for good measure. |
|
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1804 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1805 |
|
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1806 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1807 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
| 355 | 1808 "sanity check"); |
| 1809 | |
| 4711 | 1810 g1h->set_par_threads(); |
| 1811 n_workers = g1h->n_par_threads(); | |
|
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1812 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 1813 "Should not have been reset"); |
| 342 | 1814 g1h->workers()->run_task(&g1_par_count_task); |
|
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1815 // Done with the parallel phase so reset to 0. |
| 342 | 1816 g1h->set_par_threads(0); |
| 355 | 1817 |
|
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1818 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
| 355 | 1819 "sanity check"); |
| 342 | 1820 } else { |
| 4711 | 1821 n_workers = 1; |
| 342 | 1822 g1_par_count_task.work(0); |
| 1823 } | |
| 1824 | |
|
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1825 if (VerifyDuringGC) { |
|
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1826 // Verify that the counting data accumulated during marking matches |
|
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1827 // that calculated by walking the marking bitmap. |
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1828 |
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1829 // Bitmaps to hold expected values |
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1830 BitMap expected_region_bm(_region_bm.size(), false); |
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1831 BitMap expected_card_bm(_card_bm.size(), false); |
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1832 |
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1833 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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1834 &_region_bm, |
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1835 &_card_bm, |
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1836 &expected_region_bm, |
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|
1837 &expected_card_bm); |
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1838 |
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1839 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1840 g1h->set_par_threads((int)n_workers); |
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1841 g1h->workers()->run_task(&g1_par_verify_task); |
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1842 // Done with the parallel phase so reset to 0. |
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1843 g1h->set_par_threads(0); |
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1844 |
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1845 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
|
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1846 "sanity check"); |
|
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1847 } else { |
|
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1848 g1_par_verify_task.work(0); |
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1849 } |
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1850 |
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1851 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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1852 } |
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1853 |
| 342 | 1854 size_t start_used_bytes = g1h->used(); |
| 1855 g1h->set_marking_complete(); | |
| 1856 | |
| 1857 double count_end = os::elapsedTime(); | |
| 1858 double this_final_counting_time = (count_end - start); | |
| 1859 _total_counting_time += this_final_counting_time; | |
| 1860 | |
|
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1861 if (G1PrintRegionLivenessInfo) { |
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1862 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1863 _g1h->heap_region_iterate(&cl); |
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1864 } |
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1865 |
| 342 | 1866 // Install newly created mark bitMap as "prev". |
| 1867 swapMarkBitMaps(); | |
| 1868 | |
| 1869 g1h->reset_gc_time_stamp(); | |
| 1870 | |
| 1871 // Note end of marking in all heap regions. | |
| 2152 | 1872 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
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1873 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1874 g1h->set_par_threads((int)n_workers); |
| 342 | 1875 g1h->workers()->run_task(&g1_par_note_end_task); |
| 1876 g1h->set_par_threads(0); | |
| 355 | 1877 |
| 1878 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 1879 "sanity check"); | |
| 342 | 1880 } else { |
| 1881 g1_par_note_end_task.work(0); | |
| 1882 } | |
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1883 g1h->check_gc_time_stamps(); |
| 2152 | 1884 |
| 1885 if (!cleanup_list_is_empty()) { | |
| 1886 // The cleanup list is not empty, so we'll have to process it | |
| 1887 // concurrently. Notify anyone else that might be wanting free | |
| 1888 // regions that there will be more free regions coming soon. | |
| 1889 g1h->set_free_regions_coming(); | |
| 1890 } | |
| 342 | 1891 |
| 1892 // call below, since it affects the metric by which we sort the heap | |
| 1893 // regions. | |
| 1894 if (G1ScrubRemSets) { | |
| 1895 double rs_scrub_start = os::elapsedTime(); | |
| 1896 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
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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_scrub_rs_task); |
| 1900 g1h->set_par_threads(0); | |
| 355 | 1901 |
| 1902 assert(g1h->check_heap_region_claim_values( | |
| 1903 HeapRegion::ScrubRemSetClaimValue), | |
| 1904 "sanity check"); | |
| 342 | 1905 } else { |
| 1906 g1_par_scrub_rs_task.work(0); | |
| 1907 } | |
| 1908 | |
| 1909 double rs_scrub_end = os::elapsedTime(); | |
| 1910 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 1911 _total_rs_scrub_time += this_rs_scrub_time; | |
| 1912 } | |
| 1913 | |
| 1914 // this will also free any regions totally full of garbage objects, | |
| 1915 // and sort the regions. | |
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1916 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 1917 |
| 1918 // Statistics. | |
| 1919 double end = os::elapsedTime(); | |
| 1920 _cleanup_times.add((end - start) * 1000.0); | |
| 1921 | |
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1922 if (G1Log::fine()) { |
| 342 | 1923 g1h->print_size_transition(gclog_or_tty, |
| 1924 start_used_bytes, | |
| 1925 g1h->used(), | |
| 1926 g1h->capacity()); | |
| 1927 } | |
| 1928 | |
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1929 // Clean up will have freed any regions completely full of garbage. |
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1930 // Update the soft reference policy with the new heap occupancy. |
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1931 Universe::update_heap_info_at_gc(); |
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1932 |
| 342 | 1933 // We need to make this be a "collection" so any collection pause that |
| 1934 // races with it goes around and waits for completeCleanup to finish. | |
| 1935 g1h->increment_total_collections(); | |
| 1936 | |
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1937 // We reclaimed old regions so we should calculate the sizes to make |
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1938 // sure we update the old gen/space data. |
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1939 g1h->g1mm()->update_sizes(); |
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1940 |
| 751 | 1941 if (VerifyDuringGC) { |
|
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1942 HandleMark hm; // handle scope |
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1943 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1944 Universe::heap()->prepare_for_verify(); |
| 6008 | 1945 Universe::verify(/* silent */ false, |
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1946 /* option */ VerifyOption_G1UsePrevMarking); |
| 342 | 1947 } |
| 2152 | 1948 |
| 1949 g1h->verify_region_sets_optional(); | |
| 342 | 1950 } |
| 1951 | |
| 1952 void ConcurrentMark::completeCleanup() { | |
| 1953 if (has_aborted()) return; | |
| 1954 | |
| 2152 | 1955 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1956 | |
| 1957 _cleanup_list.verify_optional(); | |
| 2361 | 1958 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 1959 |
| 1960 if (G1ConcRegionFreeingVerbose) { | |
| 1961 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
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1962 "cleanup list has %u entries", |
| 2152 | 1963 _cleanup_list.length()); |
| 1964 } | |
| 1965 | |
| 1966 // Noone else should be accessing the _cleanup_list at this point, | |
| 1967 // so it's not necessary to take any locks | |
| 1968 while (!_cleanup_list.is_empty()) { | |
| 1969 HeapRegion* hr = _cleanup_list.remove_head(); | |
| 1970 assert(hr != NULL, "the list was not empty"); | |
|
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1971 hr->par_clear(); |
| 2361 | 1972 tmp_free_list.add_as_tail(hr); |
| 2152 | 1973 |
| 1974 // Instead of adding one region at a time to the secondary_free_list, | |
| 1975 // we accumulate them in the local list and move them a few at a | |
| 1976 // time. This also cuts down on the number of notify_all() calls | |
| 1977 // we do during this process. We'll also append the local list when | |
| 1978 // _cleanup_list is empty (which means we just removed the last | |
| 1979 // region from the _cleanup_list). | |
| 2361 | 1980 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 1981 _cleanup_list.is_empty()) { |
| 1982 if (G1ConcRegionFreeingVerbose) { | |
| 1983 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
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1984 "appending %u entries to the secondary_free_list, " |
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1985 "cleanup list still has %u entries", |
| 2361 | 1986 tmp_free_list.length(), |
| 2152 | 1987 _cleanup_list.length()); |
| 342 | 1988 } |
| 2152 | 1989 |
| 1990 { | |
| 1991 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 2361 | 1992 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
| 2152 | 1993 SecondaryFreeList_lock->notify_all(); |
| 1994 } | |
| 1995 | |
| 1996 if (G1StressConcRegionFreeing) { | |
| 1997 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 1998 os::sleep(Thread::current(), (jlong) 1, false); | |
| 1999 } | |
| 2000 } | |
| 342 | 2001 } |
| 2002 } | |
| 2361 | 2003 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 2004 } |
| 2005 | |
|
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2006 // Support closures for reference procssing in G1 |
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2007 |
|
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2008 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
|
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2009 HeapWord* addr = (HeapWord*)obj; |
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2010 return addr != NULL && |
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2011 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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2012 } |
| 342 | 2013 |
| 2014 class G1CMKeepAliveClosure: public OopClosure { | |
| 2015 G1CollectedHeap* _g1; | |
| 2016 ConcurrentMark* _cm; | |
| 2017 public: | |
|
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2018 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
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2019 _g1(g1), _cm(cm) { |
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2020 assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
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2021 } |
| 342 | 2022 |
|
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2023 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2024 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2025 |
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2026 template <class T> void do_oop_work(T* p) { |
|
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2027 oop obj = oopDesc::load_decode_heap_oop(p); |
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2028 HeapWord* addr = (HeapWord*)obj; |
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2029 |
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2030 if (_cm->verbose_high()) { |
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2031 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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2032 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2033 p, (void*) obj); |
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2034 } |
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2035 |
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2036 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
|
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2037 _cm->mark_and_count(obj); |
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2038 _cm->mark_stack_push(obj); |
| 342 | 2039 } |
| 2040 } | |
| 2041 }; | |
| 2042 | |
| 2043 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
|
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2044 ConcurrentMark* _cm; |
| 342 | 2045 CMMarkStack* _markStack; |
| 2046 G1CMKeepAliveClosure* _oopClosure; | |
| 2047 public: | |
|
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2048 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
| 342 | 2049 G1CMKeepAliveClosure* oopClosure) : |
|
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2050 _cm(cm), |
| 342 | 2051 _markStack(markStack), |
|
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2052 _oopClosure(oopClosure) { } |
| 342 | 2053 |
| 2054 void do_void() { | |
|
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2055 _markStack->drain((OopClosure*)_oopClosure, _cm->nextMarkBitMap(), false); |
| 342 | 2056 } |
| 2057 }; | |
| 2058 | |
|
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2059 // 'Keep Alive' closure used by parallel reference processing. |
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2060 // An instance of this closure is used in the parallel reference processing |
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2061 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2062 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2063 // placed on to discovered ref lists once so we can mark and push with no |
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2064 // need to check whether the object has already been marked. Using the |
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2065 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2066 // operating on the global mark stack. This means that an individual |
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2067 // worker would be doing lock-free pushes while it processes its own |
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2068 // discovered ref list followed by drain call. If the discovered ref lists |
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2069 // are unbalanced then this could cause interference with the other |
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2070 // workers. Using a CMTask (and its embedded local data structures) |
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2071 // avoids that potential interference. |
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2072 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2073 ConcurrentMark* _cm; |
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2074 CMTask* _task; |
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2075 int _ref_counter_limit; |
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2076 int _ref_counter; |
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2077 public: |
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2078 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2079 _cm(cm), _task(task), |
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2080 _ref_counter_limit(G1RefProcDrainInterval) { |
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2081 assert(_ref_counter_limit > 0, "sanity"); |
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2082 _ref_counter = _ref_counter_limit; |
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2083 } |
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2084 |
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2085 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2086 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2087 |
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2088 template <class T> void do_oop_work(T* p) { |
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2089 if (!_cm->has_overflown()) { |
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2090 oop obj = oopDesc::load_decode_heap_oop(p); |
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2091 if (_cm->verbose_high()) { |
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2092 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2093 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2094 _task->task_id(), p, (void*) obj); |
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2095 } |
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2096 |
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2097 _task->deal_with_reference(obj); |
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2098 _ref_counter--; |
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2099 |
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2100 if (_ref_counter == 0) { |
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2101 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2102 // reachable from them on to the local stack (and possibly the global stack). |
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2103 // Call do_marking_step() to process these entries. We call the routine in a |
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2104 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2105 // with the entries that we've pushed as a result of the deal_with_reference |
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2106 // calls above) or we overflow. |
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2107 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2108 // while there may still be some work to do. (See the comment at the |
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2109 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2110 // is reaching the specified time target.) It is only when |
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2111 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2112 // that the marking has completed. |
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2113 do { |
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2114 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2115 _task->do_marking_step(mark_step_duration_ms, |
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2116 false /* do_stealing */, |
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2117 false /* do_termination */); |
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2118 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2119 _ref_counter = _ref_counter_limit; |
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2120 } |
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2121 } else { |
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2122 if (_cm->verbose_high()) { |
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2123 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
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2124 } |
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2125 } |
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2126 } |
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2127 }; |
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2128 |
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2129 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
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2130 ConcurrentMark* _cm; |
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2131 CMTask* _task; |
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2132 public: |
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|
2133 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
|
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2134 _cm(cm), _task(task) { } |
|
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2135 |
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2136 void do_void() { |
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2137 do { |
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2138 if (_cm->verbose_high()) { |
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|
2139 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
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2140 _task->task_id()); |
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2141 } |
|
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2142 |
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2143 // We call CMTask::do_marking_step() to completely drain the local and |
|
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2144 // global marking stacks. The routine is called in a loop, which we'll |
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2145 // exit if there's nothing more to do (i.e. we'completely drained the |
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2146 // entries that were pushed as a result of applying the |
|
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2147 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
|
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|
2148 // lists above) or we overflow the global marking stack. |
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2149 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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2150 // while there may still be some work to do. (See the comment at the |
|
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2151 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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|
2152 // is reaching the specified time target.) It is only when |
|
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2153 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2154 // that the marking has completed. |
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|
2155 |
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|
2156 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2157 true /* do_stealing */, |
|
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|
2158 true /* do_termination */); |
|
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|
2159 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2160 } |
|
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|
2161 }; |
|
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|
2162 |
|
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2163 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
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|
2164 // reference processing at the end of G1 concurrent marking |
|
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|
2165 |
|
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|
2166 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
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|
2167 private: |
|
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|
2168 G1CollectedHeap* _g1h; |
|
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|
2169 ConcurrentMark* _cm; |
|
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|
2170 WorkGang* _workers; |
|
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|
2171 int _active_workers; |
|
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|
2172 |
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|
2173 public: |
|
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|
2174 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
2174
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|
2175 ConcurrentMark* cm, |
|
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|
2176 WorkGang* workers, |
|
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|
2177 int n_workers) : |
|
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|
2178 _g1h(g1h), _cm(cm), |
|
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|
2179 _workers(workers), _active_workers(n_workers) { } |
|
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|
2180 |
|
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|
2181 // Executes the given task using concurrent marking worker threads. |
|
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|
2182 virtual void execute(ProcessTask& task); |
|
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|
2183 virtual void execute(EnqueueTask& task); |
|
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|
2184 }; |
|
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|
2185 |
|
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|
2186 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
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|
2187 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
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|
2188 ProcessTask& _proc_task; |
|
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|
2189 G1CollectedHeap* _g1h; |
|
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|
2190 ConcurrentMark* _cm; |
|
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|
2191 |
|
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|
2192 public: |
|
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|
2193 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
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|
2194 G1CollectedHeap* g1h, |
|
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|
2195 ConcurrentMark* cm) : |
|
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|
2196 AbstractGangTask("Process reference objects in parallel"), |
|
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|
2197 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
|
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|
2198 |
|
4728
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|
2199 virtual void work(uint worker_id) { |
|
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|
2200 CMTask* marking_task = _cm->task(worker_id); |
|
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|
2201 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
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2202 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
|
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2203 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2204 |
|
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2205 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
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|
2206 } |
|
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|
2207 }; |
|
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2208 |
|
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2209 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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2210 assert(_workers != NULL, "Need parallel worker threads."); |
|
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2211 |
|
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2212 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
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2213 |
|
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2214 // We need to reset the phase for each task execution so that |
|
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2215 // the termination protocol of CMTask::do_marking_step works. |
|
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2216 _cm->set_phase(_active_workers, false /* concurrent */); |
|
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2217 _g1h->set_par_threads(_active_workers); |
|
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2218 _workers->run_task(&proc_task_proxy); |
|
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2219 _g1h->set_par_threads(0); |
|
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|
2220 } |
|
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2221 |
|
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2222 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
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2223 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
2224 EnqueueTask& _enq_task; |
|
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|
2225 |
|
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2226 public: |
|
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|
2227 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
2174
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2228 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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2229 _enq_task(enq_task) { } |
|
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2230 |
|
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|
2231 virtual void work(uint worker_id) { |
|
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|
2232 _enq_task.work(worker_id); |
|
2174
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|
2233 } |
|
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|
2234 }; |
|
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|
2235 |
|
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|
2236 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
2237 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
2238 |
|
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|
2239 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
2174
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|
2240 |
|
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|
2241 _g1h->set_par_threads(_active_workers); |
|
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|
2242 _workers->run_task(&enq_task_proxy); |
|
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|
2243 _g1h->set_par_threads(0); |
|
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|
2244 } |
|
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|
2245 |
| 342 | 2246 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
| 2247 ResourceMark rm; | |
| 2248 HandleMark hm; | |
|
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|
2249 |
|
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|
2250 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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|
2251 |
|
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|
2252 // Is alive closure. |
|
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|
2253 G1CMIsAliveClosure g1_is_alive(g1h); |
|
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|
2254 |
|
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|
2255 // Inner scope to exclude the cleaning of the string and symbol |
|
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|
2256 // tables from the displayed time. |
|
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|
2257 { |
|
6007
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|
2258 if (G1Log::finer()) { |
|
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|
2259 gclog_or_tty->put(' '); |
|
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|
2260 } |
|
6007
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|
2261 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
|
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|
2262 |
|
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|
2263 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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|
2264 |
|
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|
2265 // See the comment in G1CollectedHeap::ref_processing_init() |
|
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|
2266 // about how reference processing currently works in G1. |
|
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|
2267 |
|
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|
2268 // Process weak references. |
|
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|
2269 rp->setup_policy(clear_all_soft_refs); |
|
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|
2270 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
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|
2271 |
|
4836
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|
2272 G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
|
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|
2273 G1CMDrainMarkingStackClosure |
|
4836
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|
2274 g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
|
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|
2275 |
|
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|
2276 // We use the work gang from the G1CollectedHeap and we utilize all |
|
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|
2277 // the worker threads. |
|
4728
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|
2278 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
|
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|
2279 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
|
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|
2280 |
|
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|
2281 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
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|
2282 g1h->workers(), active_workers); |
|
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|
2283 |
|
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|
2284 if (rp->processing_is_mt()) { |
|
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|
2285 // Set the degree of MT here. If the discovery is done MT, there |
|
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|
2286 // may have been a different number of threads doing the discovery |
|
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|
2287 // and a different number of discovered lists may have Ref objects. |
|
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|
2288 // That is OK as long as the Reference lists are balanced (see |
|
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|
2289 // balance_all_queues() and balance_queues()). |
|
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|
2290 rp->set_active_mt_degree(active_workers); |
|
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|
2291 |
|
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|
2292 rp->process_discovered_references(&g1_is_alive, |
|
2174
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|
2293 &g1_keep_alive, |
|
234761c55641
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|
2294 &g1_drain_mark_stack, |
|
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|
2295 &par_task_executor); |
|
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|
2296 |
|
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|
2297 // The work routines of the parallel keep_alive and drain_marking_stack |
|
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|
2298 // will set the has_overflown flag if we overflow the global marking |
|
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|
2299 // stack. |
|
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|
2300 } else { |
|
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|
2301 rp->process_discovered_references(&g1_is_alive, |
|
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|
2302 &g1_keep_alive, |
|
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|
2303 &g1_drain_mark_stack, |
|
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|
2304 NULL); |
|
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|
2305 } |
|
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|
2306 |
|
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|
2307 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
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|
2308 "mark stack should be empty (unless it overflowed)"); |
|
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|
2309 if (_markStack.overflow()) { |
|
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|
2310 // Should have been done already when we tried to push an |
|
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|
2311 // entry on to the global mark stack. But let's do it again. |
|
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|
2312 set_has_overflown(); |
|
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|
2313 } |
|
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|
2314 |
|
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|
2315 if (rp->processing_is_mt()) { |
|
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|
2316 assert(rp->num_q() == active_workers, "why not"); |
|
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|
2317 rp->enqueue_discovered_references(&par_task_executor); |
|
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|
2318 } else { |
|
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|
2319 rp->enqueue_discovered_references(); |
|
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|
2320 } |
|
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|
2321 |
|
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|
2322 rp->verify_no_references_recorded(); |
|
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|
2323 assert(!rp->discovery_enabled(), "Post condition"); |
|
2174
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|
2324 } |
|
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|
2325 |
|
2177
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diff
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|
2326 // Now clean up stale oops in StringTable |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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1974
diff
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|
2327 StringTable::unlink(&g1_is_alive); |
|
2177
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|
2328 // Clean up unreferenced symbols in symbol table. |
|
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|
2329 SymbolTable::unlink(); |
| 342 | 2330 } |
| 2331 | |
| 2332 void ConcurrentMark::swapMarkBitMaps() { | |
| 2333 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2334 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2335 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2336 } | |
| 2337 | |
| 2338 class CMRemarkTask: public AbstractGangTask { | |
| 2339 private: | |
| 2340 ConcurrentMark *_cm; | |
| 2341 | |
| 2342 public: | |
|
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2343 void work(uint worker_id) { |
| 342 | 2344 // Since all available tasks are actually started, we should |
| 2345 // only proceed if we're supposed to be actived. | |
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2346 if (worker_id < _cm->active_tasks()) { |
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2347 CMTask* task = _cm->task(worker_id); |
| 342 | 2348 task->record_start_time(); |
| 2349 do { | |
|
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2350 task->do_marking_step(1000000000.0 /* something very large */, |
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2351 true /* do_stealing */, |
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2352 true /* do_termination */); |
| 342 | 2353 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2354 // If we overflow, then we do not want to restart. We instead | |
| 2355 // want to abort remark and do concurrent marking again. | |
| 2356 task->record_end_time(); | |
| 2357 } | |
| 2358 } | |
| 2359 | |
| 4711 | 2360 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
|
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2361 AbstractGangTask("Par Remark"), _cm(cm) { |
| 4711 | 2362 _cm->terminator()->reset_for_reuse(active_workers); |
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2363 } |
| 342 | 2364 }; |
| 2365 | |
| 2366 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2367 ResourceMark rm; | |
| 2368 HandleMark hm; | |
| 2369 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2370 | |
| 2371 g1h->ensure_parsability(false); | |
| 2372 | |
|
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2373 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2374 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
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2375 // this is remark, so we'll use up all active threads |
|
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2376 uint active_workers = g1h->workers()->active_workers(); |
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2377 if (active_workers == 0) { |
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2378 assert(active_workers > 0, "Should have been set earlier"); |
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2379 active_workers = (uint) ParallelGCThreads; |
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2380 g1h->workers()->set_active_workers(active_workers); |
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2381 } |
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2382 set_phase(active_workers, false /* concurrent */); |
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2383 // Leave _parallel_marking_threads at it's |
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2384 // value originally calculated in the ConcurrentMark |
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2385 // constructor and pass values of the active workers |
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2386 // through the gang in the task. |
| 342 | 2387 |
| 4711 | 2388 CMRemarkTask remarkTask(this, active_workers); |
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2389 g1h->set_par_threads(active_workers); |
| 342 | 2390 g1h->workers()->run_task(&remarkTask); |
| 2391 g1h->set_par_threads(0); | |
| 2392 } else { | |
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2393 G1CollectedHeap::StrongRootsScope srs(g1h); |
| 342 | 2394 // this is remark, so we'll use up all available threads |
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2395 uint active_workers = 1; |
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2396 set_phase(active_workers, false /* concurrent */); |
| 342 | 2397 |
| 4711 | 2398 CMRemarkTask remarkTask(this, active_workers); |
| 342 | 2399 // We will start all available threads, even if we decide that the |
| 2400 // active_workers will be fewer. The extra ones will just bail out | |
| 2401 // immediately. | |
| 2402 remarkTask.work(0); | |
| 2403 } | |
|
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2404 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
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|
2405 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2406 |
| 2407 print_stats(); | |
| 2408 | |
| 2409 #if VERIFY_OBJS_PROCESSED | |
| 2410 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
| 2411 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
| 2412 _scan_obj_cl.objs_processed, | |
| 2413 ThreadLocalObjQueue::objs_enqueued); | |
| 2414 guarantee(_scan_obj_cl.objs_processed == | |
| 2415 ThreadLocalObjQueue::objs_enqueued, | |
| 2416 "Different number of objs processed and enqueued."); | |
| 2417 } | |
| 2418 #endif | |
| 2419 } | |
| 2420 | |
| 1044 | 2421 #ifndef PRODUCT |
| 2422 | |
| 1388 | 2423 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2424 private: |
| 2425 G1CollectedHeap* _g1h; | |
| 2426 outputStream* _out; | |
|
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2427 VerifyOption _vo; |
| 1388 | 2428 bool _all; |
| 342 | 2429 |
| 2430 public: | |
|
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2431 PrintReachableOopClosure(outputStream* out, |
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2432 VerifyOption vo, |
| 1388 | 2433 bool all) : |
| 1044 | 2434 _g1h(G1CollectedHeap::heap()), |
|
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2435 _out(out), _vo(vo), _all(all) { } |
| 342 | 2436 |
|
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2437 void do_oop(narrowOop* p) { do_oop_work(p); } |
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2438 void do_oop( oop* p) { do_oop_work(p); } |
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2439 |
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2440 template <class T> void do_oop_work(T* p) { |
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2441 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2442 const char* str = NULL; |
| 2443 const char* str2 = ""; | |
| 2444 | |
| 1388 | 2445 if (obj == NULL) { |
| 2446 str = ""; | |
| 2447 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2448 str = " O"; | |
| 2449 } else { | |
| 342 | 2450 HeapRegion* hr = _g1h->heap_region_containing(obj); |
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|
2451 guarantee(hr != NULL, "invariant"); |
|
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2452 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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2453 bool marked = _g1h->is_marked(obj, _vo); |
| 1044 | 2454 |
| 2455 if (over_tams) { | |
| 1388 | 2456 str = " >"; |
| 2457 if (marked) { | |
| 342 | 2458 str2 = " AND MARKED"; |
| 1044 | 2459 } |
| 1388 | 2460 } else if (marked) { |
| 2461 str = " M"; | |
| 1044 | 2462 } else { |
| 1388 | 2463 str = " NOT"; |
| 1044 | 2464 } |
| 342 | 2465 } |
| 2466 | |
| 1388 | 2467 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
| 342 | 2468 p, (void*) obj, str, str2); |
| 2469 } | |
| 2470 }; | |
| 2471 | |
| 1388 | 2472 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2473 private: |
|
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2474 G1CollectedHeap* _g1h; |
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2475 outputStream* _out; |
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2476 VerifyOption _vo; |
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|
2477 bool _all; |
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2478 HeapRegion* _hr; |
| 342 | 2479 |
| 2480 public: | |
|
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2481 PrintReachableObjectClosure(outputStream* out, |
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|
2482 VerifyOption vo, |
| 1388 | 2483 bool all, |
| 2484 HeapRegion* hr) : | |
|
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2485 _g1h(G1CollectedHeap::heap()), |
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|
2486 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2487 |
| 2488 void do_object(oop o) { | |
|
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2489 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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|
2490 bool marked = _g1h->is_marked(o, _vo); |
| 1388 | 2491 bool print_it = _all || over_tams || marked; |
| 2492 | |
| 2493 if (print_it) { | |
| 2494 _out->print_cr(" "PTR_FORMAT"%s", | |
| 2495 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
|
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|
2496 PrintReachableOopClosure oopCl(_out, _vo, _all); |
| 1388 | 2497 o->oop_iterate(&oopCl); |
| 2498 } | |
| 342 | 2499 } |
| 2500 }; | |
| 2501 | |
| 1388 | 2502 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2503 private: |
|
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2504 G1CollectedHeap* _g1h; |
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2505 outputStream* _out; |
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2506 VerifyOption _vo; |
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|
2507 bool _all; |
| 342 | 2508 |
| 2509 public: | |
| 2510 bool doHeapRegion(HeapRegion* hr) { | |
| 2511 HeapWord* b = hr->bottom(); | |
| 2512 HeapWord* e = hr->end(); | |
| 2513 HeapWord* t = hr->top(); | |
|
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2514 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
| 342 | 2515 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
| 1044 | 2516 "TAMS: "PTR_FORMAT, b, e, t, p); |
| 1388 | 2517 _out->cr(); |
| 2518 | |
| 2519 HeapWord* from = b; | |
| 2520 HeapWord* to = t; | |
| 2521 | |
| 2522 if (to > from) { | |
| 2523 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
| 2524 _out->cr(); | |
|
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|
2525 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2526 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2527 _out->cr(); | |
| 2528 } | |
| 342 | 2529 |
| 2530 return false; | |
| 2531 } | |
| 2532 | |
|
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|
2533 PrintReachableRegionClosure(outputStream* out, |
|
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|
2534 VerifyOption vo, |
| 1388 | 2535 bool all) : |
|
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2536 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
| 342 | 2537 }; |
| 2538 | |
| 1388 | 2539 void ConcurrentMark::print_reachable(const char* str, |
|
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|
2540 VerifyOption vo, |
| 1388 | 2541 bool all) { |
| 2542 gclog_or_tty->cr(); | |
| 2543 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 2544 |
| 2545 if (G1PrintReachableBaseFile == NULL) { | |
| 2546 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 2547 return; | |
| 2548 } | |
| 2549 | |
| 2550 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 2551 (JVM_MAXPATHLEN - 1)) { | |
| 2552 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 2553 return; | |
| 2554 } | |
| 2555 | |
| 2556 char file_name[JVM_MAXPATHLEN]; | |
| 2557 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 2558 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 2559 | |
| 2560 fileStream fout(file_name); | |
| 2561 if (!fout.is_open()) { | |
| 2562 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 2563 return; | |
| 2564 } | |
| 2565 | |
| 2566 outputStream* out = &fout; | |
|
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|
2567 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
| 1044 | 2568 out->cr(); |
| 2569 | |
| 1388 | 2570 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2571 out->cr(); |
|
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|
2572 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 2573 _g1h->heap_region_iterate(&rcl); |
| 1044 | 2574 out->cr(); |
| 2575 | |
| 2576 gclog_or_tty->print_cr(" done"); | |
| 1388 | 2577 gclog_or_tty->flush(); |
| 342 | 2578 } |
| 2579 | |
| 1044 | 2580 #endif // PRODUCT |
| 2581 | |
|
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|
2582 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 2583 // Note we are overriding the read-only view of the prev map here, via |
| 2584 // the cast. | |
| 2585 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
|
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2586 } |
|
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2587 |
|
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|
2588 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 2589 _nextMarkBitMap->clearRange(mr); |
| 2590 } | |
| 2591 | |
|
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|
2592 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
|
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|
2593 clearRangePrevBitmap(mr); |
|
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|
2594 clearRangeNextBitmap(mr); |
|
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|
2595 } |
|
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2596 |
| 342 | 2597 HeapRegion* |
| 2598 ConcurrentMark::claim_region(int task_num) { | |
| 2599 // "checkpoint" the finger | |
| 2600 HeapWord* finger = _finger; | |
| 2601 | |
| 2602 // _heap_end will not change underneath our feet; it only changes at | |
| 2603 // yield points. | |
| 2604 while (finger < _heap_end) { | |
|
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2605 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 2606 |
| 3771 | 2607 // Note on how this code handles humongous regions. In the |
| 2608 // normal case the finger will reach the start of a "starts | |
| 2609 // humongous" (SH) region. Its end will either be the end of the | |
| 2610 // last "continues humongous" (CH) region in the sequence, or the | |
| 2611 // standard end of the SH region (if the SH is the only region in | |
| 2612 // the sequence). That way claim_region() will skip over the CH | |
| 2613 // regions. However, there is a subtle race between a CM thread | |
| 2614 // executing this method and a mutator thread doing a humongous | |
| 2615 // object allocation. The two are not mutually exclusive as the CM | |
| 2616 // thread does not need to hold the Heap_lock when it gets | |
| 2617 // here. So there is a chance that claim_region() will come across | |
| 2618 // a free region that's in the progress of becoming a SH or a CH | |
| 2619 // region. In the former case, it will either | |
| 2620 // a) Miss the update to the region's end, in which case it will | |
| 2621 // visit every subsequent CH region, will find their bitmaps | |
| 2622 // empty, and do nothing, or | |
| 2623 // b) Will observe the update of the region's end (in which case | |
| 2624 // it will skip the subsequent CH regions). | |
| 2625 // If it comes across a region that suddenly becomes CH, the | |
| 2626 // scenario will be similar to b). So, the race between | |
| 2627 // claim_region() and a humongous object allocation might force us | |
| 2628 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 2629 // iterations) but it should not introduce and correctness issues. | |
| 2630 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
| 342 | 2631 HeapWord* bottom = curr_region->bottom(); |
| 2632 HeapWord* end = curr_region->end(); | |
| 2633 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 2634 | |
| 3771 | 2635 if (verbose_low()) { |
| 342 | 2636 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
| 2637 "["PTR_FORMAT", "PTR_FORMAT"), " | |
| 2638 "limit = "PTR_FORMAT, | |
| 2639 task_num, curr_region, bottom, end, limit); | |
| 3771 | 2640 } |
| 2641 | |
| 2642 // Is the gap between reading the finger and doing the CAS too long? | |
| 2643 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 342 | 2644 if (res == finger) { |
| 2645 // we succeeded | |
| 2646 | |
| 2647 // notice that _finger == end cannot be guaranteed here since, | |
| 2648 // someone else might have moved the finger even further | |
|
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2649 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 2650 |
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2651 if (verbose_low()) { |
| 342 | 2652 gclog_or_tty->print_cr("[%d] we were successful with region = " |
| 2653 PTR_FORMAT, task_num, curr_region); | |
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2654 } |
| 342 | 2655 |
| 2656 if (limit > bottom) { | |
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2657 if (verbose_low()) { |
| 342 | 2658 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
| 2659 "returning it ", task_num, curr_region); | |
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2660 } |
| 342 | 2661 return curr_region; |
| 2662 } else { | |
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2663 assert(limit == bottom, |
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2664 "the region limit should be at bottom"); |
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2665 if (verbose_low()) { |
| 342 | 2666 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
| 2667 "returning NULL", task_num, curr_region); | |
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2668 } |
| 342 | 2669 // we return NULL and the caller should try calling |
| 2670 // claim_region() again. | |
| 2671 return NULL; | |
| 2672 } | |
| 2673 } else { | |
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2674 assert(_finger > finger, "the finger should have moved forward"); |
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2675 if (verbose_low()) { |
| 342 | 2676 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
| 2677 "global finger = "PTR_FORMAT", " | |
| 2678 "our finger = "PTR_FORMAT, | |
| 2679 task_num, _finger, finger); | |
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2680 } |
| 342 | 2681 |
| 2682 // read it again | |
| 2683 finger = _finger; | |
| 2684 } | |
| 2685 } | |
| 2686 | |
| 2687 return NULL; | |
| 2688 } | |
| 2689 | |
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2690 #ifndef PRODUCT |
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2691 enum VerifyNoCSetOopsPhase { |
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2692 VerifyNoCSetOopsStack, |
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2693 VerifyNoCSetOopsQueues, |
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2694 VerifyNoCSetOopsSATBCompleted, |
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2695 VerifyNoCSetOopsSATBThread |
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2696 }; |
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2697 |
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2698 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2699 private: |
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2700 G1CollectedHeap* _g1h; |
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2701 VerifyNoCSetOopsPhase _phase; |
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2702 int _info; |
|
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2703 |
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2704 const char* phase_str() { |
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2705 switch (_phase) { |
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2706 case VerifyNoCSetOopsStack: return "Stack"; |
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2707 case VerifyNoCSetOopsQueues: return "Queue"; |
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2708 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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2709 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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2710 default: ShouldNotReachHere(); |
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2711 } |
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2712 return NULL; |
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2713 } |
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2714 |
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2715 void do_object_work(oop obj) { |
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2716 guarantee(!_g1h->obj_in_cs(obj), |
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2717 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
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2718 (void*) obj, phase_str(), _info)); |
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2719 } |
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2720 |
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2721 public: |
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2722 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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2723 |
|
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2724 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
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2725 _phase = phase; |
|
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2726 _info = info; |
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|
2727 } |
|
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2728 |
|
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|
2729 virtual void do_oop(oop* p) { |
|
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2730 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2731 do_object_work(obj); |
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2732 } |
|
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2733 |
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2734 virtual void do_oop(narrowOop* p) { |
|
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2735 // We should not come across narrow oops while scanning marking |
|
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2736 // stacks and SATB buffers. |
|
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|
2737 ShouldNotReachHere(); |
|
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2738 } |
|
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2739 |
|
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2740 virtual void do_object(oop obj) { |
|
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2741 do_object_work(obj); |
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2742 } |
|
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|
2743 }; |
|
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2744 |
|
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2745 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
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2746 bool verify_enqueued_buffers, |
|
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2747 bool verify_thread_buffers, |
|
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2748 bool verify_fingers) { |
|
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2749 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
|
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2750 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
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2751 return; |
| 342 | 2752 } |
|
1835
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2753 |
|
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2754 VerifyNoCSetOopsClosure cl; |
|
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2755 |
|
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|
2756 if (verify_stacks) { |
|
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2757 // Verify entries on the global mark stack |
|
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2758 cl.set_phase(VerifyNoCSetOopsStack); |
|
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2759 _markStack.oops_do(&cl); |
|
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2760 |
|
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|
2761 // Verify entries on the task queues |
|
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2762 for (int i = 0; i < (int) _max_task_num; i += 1) { |
|
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|
2763 cl.set_phase(VerifyNoCSetOopsQueues, i); |
|
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|
2764 OopTaskQueue* queue = _task_queues->queue(i); |
|
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|
2765 queue->oops_do(&cl); |
|
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|
2766 } |
|
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|
2767 } |
|
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|
2768 |
|
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|
2769 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
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|
2770 |
|
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|
2771 // Verify entries on the enqueued SATB buffers |
|
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|
2772 if (verify_enqueued_buffers) { |
|
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2773 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
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|
2774 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
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|
2775 } |
|
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|
2776 |
|
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|
2777 // Verify entries on the per-thread SATB buffers |
|
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|
2778 if (verify_thread_buffers) { |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2779 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4783
diff
changeset
|
2780 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2781 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2782 |
|
4787
2ace1c4ee8da
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diff
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|
2783 if (verify_fingers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
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|
2784 // Verify the global finger |
|
2ace1c4ee8da
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|
2785 HeapWord* global_finger = finger(); |
|
2ace1c4ee8da
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diff
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|
2786 if (global_finger != NULL && global_finger < _heap_end) { |
|
2ace1c4ee8da
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parents:
4783
diff
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|
2787 // The global finger always points to a heap region boundary. We |
|
2ace1c4ee8da
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diff
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|
2788 // use heap_region_containing_raw() to get the containing region |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
2789 // given that the global finger could be pointing to a free region |
|
2ace1c4ee8da
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diff
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|
2790 // which subsequently becomes continues humongous. If that |
|
2ace1c4ee8da
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|
2791 // happens, heap_region_containing() will return the bottom of the |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
2792 // corresponding starts humongous region and the check below will |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
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|
2793 // not hold any more. |
|
2ace1c4ee8da
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parents:
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diff
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|
2794 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
|
2ace1c4ee8da
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|
2795 guarantee(global_finger == global_hr->bottom(), |
|
2ace1c4ee8da
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tonyp
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diff
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|
2796 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
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parents:
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diff
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|
2797 global_finger, HR_FORMAT_PARAMS(global_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
2798 } |
|
2ace1c4ee8da
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parents:
4783
diff
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|
2799 |
|
2ace1c4ee8da
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parents:
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diff
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|
2800 // Verify the task fingers |
|
2ace1c4ee8da
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parents:
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|
2801 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
2ace1c4ee8da
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parents:
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|
2802 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
2803 CMTask* task = _tasks[i]; |
|
2ace1c4ee8da
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parents:
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|
2804 HeapWord* task_finger = task->finger(); |
|
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diff
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|
2805 if (task_finger != NULL && task_finger < _heap_end) { |
|
2ace1c4ee8da
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parents:
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diff
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|
2806 // See above note on the global finger verification. |
|
2ace1c4ee8da
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parents:
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diff
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|
2807 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
|
2ace1c4ee8da
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parents:
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|
2808 guarantee(task_finger == task_hr->bottom() || |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2809 !task_hr->in_collection_set(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
2810 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
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parents:
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diff
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|
2811 task_finger, HR_FORMAT_PARAMS(task_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
2812 } |
|
2ace1c4ee8da
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parents:
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diff
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|
2813 } |
|
2ace1c4ee8da
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parents:
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diff
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|
2814 } |
| 342 | 2815 } |
|
4787
2ace1c4ee8da
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parents:
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|
2816 #endif // PRODUCT |
| 342 | 2817 |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2818 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
| 342 | 2819 _markStack.setEmpty(); |
| 2820 _markStack.clear_overflow(); | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2821 if (clear_overflow) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2822 clear_has_overflown(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2823 } else { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2824 assert(has_overflown(), "pre-condition"); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2825 } |
| 342 | 2826 _finger = _heap_start; |
| 2827 | |
| 2828 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 2829 OopTaskQueue* queue = _task_queues->queue(i); | |
| 2830 queue->set_empty(); | |
| 2831 } | |
| 2832 } | |
| 2833 | |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2834 // Aggregate the counting data that was constructed concurrently |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
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|
2835 // with marking. |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
2836 class AggregateCountDataHRClosure: public HeapRegionClosure { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
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|
2837 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
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|
2838 BitMap* _cm_card_bm; |
|
d30fa85f9994
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parents:
4830
diff
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|
2839 size_t _max_task_num; |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
2840 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2841 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2842 AggregateCountDataHRClosure(ConcurrentMark *cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2843 BitMap* cm_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2844 size_t max_task_num) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2845 _cm(cm), _cm_card_bm(cm_card_bm), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2846 _max_task_num(max_task_num) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2847 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2848 bool is_card_aligned(HeapWord* p) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2849 return ((uintptr_t(p) & (CardTableModRefBS::card_size - 1)) == 0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2850 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2851 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2852 bool doHeapRegion(HeapRegion* hr) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2853 if (hr->continuesHumongous()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2854 // 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
|
2855 // associated "starts humongous" region is processed. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2856 // Note that we cannot rely on their associated |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2857 // "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
|
2858 // 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
|
2859 // iteration, a "continues humongous" region might be visited |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2860 // before its associated "starts humongous". |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2861 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2862 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2863 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2864 HeapWord* start = hr->bottom(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2865 HeapWord* limit = hr->next_top_at_mark_start(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2866 HeapWord* end = hr->end(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2867 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2868 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
|
2869 err_msg("Preconditions not met - " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2870 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2871 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2872 start, limit, hr->top(), hr->end())); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2873 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2874 assert(hr->next_marked_bytes() == 0, "Precondition"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2875 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2876 if (start == limit) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2877 // 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
|
2878 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2879 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2880 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2881 assert(is_card_aligned(start), "sanity"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2882 assert(is_card_aligned(end), "sanity"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2883 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2884 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
|
2885 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
|
2886 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
|
2887 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2888 // If ntams is not card aligned then we bump the index for |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2889 // limit so that we get the card spanning ntams. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2890 if (!is_card_aligned(limit)) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2891 limit_idx += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2892 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2893 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2894 assert(limit_idx <= end_idx, "or else use atomics"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2895 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2896 // 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
|
2897 uint hrs_index = hr->hrs_index(); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2898 size_t marked_bytes = 0; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2899 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2900 for (int i = 0; (size_t)i < _max_task_num; i += 1) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2901 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
|
2902 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
|
2903 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2904 // 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
|
2905 // add it to the running total for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2906 marked_bytes += marked_bytes_array[hrs_index]; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2907 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2908 // Now union the bitmaps[0,max_task_num)[start_idx..limit_idx) |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2909 // into the global card bitmap. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2910 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2911 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2912 while (scan_idx < limit_idx) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2913 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
|
2914 _cm_card_bm->set_bit(scan_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2915 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2916 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2917 // BitMap::get_next_one_offset() can handle the case when |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2918 // its left_offset parameter is greater than its right_offset |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2919 // parameter. If does, however, have an early exit if |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2920 // 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
|
2921 // passed in for left offset here. |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
2922 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2923 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
2924 } |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
2925 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2926 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
2927 // Update the marked bytes for this region. |
|
d30fa85f9994
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parents:
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diff
changeset
|
2928 hr->add_to_marked_bytes(marked_bytes); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
2929 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2930 // Next heap region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2931 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2932 } |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
2933 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2934 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2935 class G1AggregateCountDataTask: public AbstractGangTask { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2936 protected: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2937 G1CollectedHeap* _g1h; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2938 ConcurrentMark* _cm; |
|
d30fa85f9994
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parents:
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diff
changeset
|
2939 BitMap* _cm_card_bm; |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
2940 size_t _max_task_num; |
|
d30fa85f9994
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parents:
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diff
changeset
|
2941 int _active_workers; |
|
d30fa85f9994
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parents:
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diff
changeset
|
2942 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
2943 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2944 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
2945 ConcurrentMark* cm, |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
2946 BitMap* cm_card_bm, |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
2947 size_t max_task_num, |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
2948 int n_workers) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2949 AbstractGangTask("Count Aggregation"), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2950 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
|
d30fa85f9994
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parents:
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diff
changeset
|
2951 _max_task_num(max_task_num), |
|
d30fa85f9994
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parents:
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diff
changeset
|
2952 _active_workers(n_workers) { } |
|
d30fa85f9994
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parents:
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diff
changeset
|
2953 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
2954 void work(uint worker_id) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2955 AggregateCountDataHRClosure cl(_cm, _cm_card_bm, _max_task_num); |
|
d30fa85f9994
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parents:
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diff
changeset
|
2956 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2957 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2958 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
2959 _active_workers, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2960 HeapRegion::AggregateCountClaimValue); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2961 } else { |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
2962 _g1h->heap_region_iterate(&cl); |
|
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 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2966 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2967 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2968 void ConcurrentMark::aggregate_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2969 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2970 _g1h->workers()->active_workers() : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2971 1); |
|
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 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2974 _max_task_num, n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2975 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2976 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2977 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2978 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2979 _g1h->set_par_threads(n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2980 _g1h->workers()->run_task(&g1_par_agg_task); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2981 _g1h->set_par_threads(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2982 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2983 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2984 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2985 _g1h->reset_heap_region_claim_values(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2986 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2987 g1_par_agg_task.work(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2988 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2989 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2990 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2991 // Clear the per-worker arrays used to store the per-region counting data |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2992 void ConcurrentMark::clear_all_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2993 // Clear the global card bitmap - it will be filled during |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2994 // liveness count aggregation (during remark) and the |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2995 // final counting task. |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
2996 _card_bm.clear(); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
2997 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2998 // Clear the global region bitmap - it will be filled as part |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2999 // of the final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3000 _region_bm.clear(); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3001 |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3002 uint max_regions = _g1h->max_regions(); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3003 assert(_max_task_num != 0, "unitialized"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3004 |
|
d30fa85f9994
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4830
diff
changeset
|
3005 for (int i = 0; (size_t) i < _max_task_num; i += 1) { |
|
d30fa85f9994
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diff
changeset
|
3006 BitMap* task_card_bm = count_card_bitmap_for(i); |
|
d30fa85f9994
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4830
diff
changeset
|
3007 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3008 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
changeset
|
3009 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3010 assert(marked_bytes_array != NULL, "uninitialized"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3011 |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3012 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
|
4836
d30fa85f9994
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parents:
4830
diff
changeset
|
3013 task_card_bm->clear(); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3014 } |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3015 } |
|
d30fa85f9994
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diff
changeset
|
3016 |
| 342 | 3017 void ConcurrentMark::print_stats() { |
| 3018 if (verbose_stats()) { | |
| 3019 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3020 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3021 _tasks[i]->print_stats(); | |
| 3022 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3023 } | |
| 3024 } | |
| 3025 } | |
| 3026 | |
| 3027 // abandon current marking iteration due to a Full GC | |
| 3028 void ConcurrentMark::abort() { | |
| 3029 // Clear all marks to force marking thread to do nothing | |
| 3030 _nextMarkBitMap->clearAll(); | |
|
4836
d30fa85f9994
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4830
diff
changeset
|
3031 // Clear the liveness counting data |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3032 clear_all_count_data(); |
| 342 | 3033 // Empty mark stack |
| 3034 clear_marking_state(); | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3035 for (int i = 0; i < (int)_max_task_num; ++i) { |
| 342 | 3036 _tasks[i]->clear_region_fields(); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3037 } |
| 342 | 3038 _has_aborted = true; |
| 3039 | |
| 3040 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3041 satb_mq_set.abandon_partial_marking(); | |
|
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3042 // This can be called either during or outside marking, we'll read |
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3043 // the expected_active value from the SATB queue set. |
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3044 satb_mq_set.set_active_all_threads( |
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3045 false, /* new active value */ |
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3046 satb_mq_set.is_active() /* expected_active */); |
| 342 | 3047 } |
| 3048 | |
| 3049 static void print_ms_time_info(const char* prefix, const char* name, | |
| 3050 NumberSeq& ns) { | |
| 3051 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3052 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3053 if (ns.num() > 0) { | |
| 3054 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3055 prefix, ns.sd(), ns.maximum()); | |
| 3056 } | |
| 3057 } | |
| 3058 | |
| 3059 void ConcurrentMark::print_summary_info() { | |
| 3060 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3061 print_ms_time_info(" ", "init marks", _init_times); | |
| 3062 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3063 { | |
| 3064 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3065 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3066 | |
| 3067 } | |
| 3068 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3069 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3070 _total_counting_time, | |
| 3071 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3072 (double)_cleanup_times.num() | |
| 3073 : 0.0)); | |
| 3074 if (G1ScrubRemSets) { | |
| 3075 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3076 _total_rs_scrub_time, | |
| 3077 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3078 (double)_cleanup_times.num() | |
| 3079 : 0.0)); | |
| 3080 } | |
| 3081 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3082 (_init_times.sum() + _remark_times.sum() + | |
| 3083 _cleanup_times.sum())/1000.0); | |
| 3084 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
|
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3085 "(%8.2f s marking).", |
| 342 | 3086 cmThread()->vtime_accum(), |
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3087 cmThread()->vtime_mark_accum()); |
| 342 | 3088 } |
| 3089 | |
| 1019 | 3090 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
| 3091 _parallel_workers->print_worker_threads_on(st); | |
| 3092 } | |
| 3093 | |
| 342 | 3094 // We take a break if someone is trying to stop the world. |
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3095 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 342 | 3096 if (should_yield()) { |
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3097 if (worker_id == 0) { |
| 342 | 3098 _g1h->g1_policy()->record_concurrent_pause(); |
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3099 } |
| 342 | 3100 cmThread()->yield(); |
| 3101 return true; | |
| 3102 } else { | |
| 3103 return false; | |
| 3104 } | |
| 3105 } | |
| 3106 | |
| 3107 bool ConcurrentMark::should_yield() { | |
| 3108 return cmThread()->should_yield(); | |
| 3109 } | |
| 3110 | |
| 3111 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 3112 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 3113 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 3114 } | |
| 3115 | |
| 3116 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 3117 void* last) { | |
|
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3118 return containing_card_is_marked(start) && |
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3119 containing_card_is_marked(last); |
| 342 | 3120 } |
| 3121 | |
| 3122 #ifndef PRODUCT | |
| 3123 // for debugging purposes | |
| 3124 void ConcurrentMark::print_finger() { | |
| 3125 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
| 3126 _heap_start, _heap_end, _finger); | |
| 3127 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 3128 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
| 3129 } | |
| 3130 gclog_or_tty->print_cr(""); | |
| 3131 } | |
| 3132 #endif | |
| 3133 | |
| 3771 | 3134 void CMTask::scan_object(oop obj) { |
| 3135 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3136 | |
| 3137 if (_cm->verbose_high()) { | |
| 3138 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
| 3139 _task_id, (void*) obj); | |
| 3140 } | |
| 3141 | |
| 3142 size_t obj_size = obj->size(); | |
| 3143 _words_scanned += obj_size; | |
| 3144 | |
| 3145 obj->oop_iterate(_cm_oop_closure); | |
| 3146 statsOnly( ++_objs_scanned ); | |
| 3147 check_limits(); | |
| 3148 } | |
| 3149 | |
| 342 | 3150 // Closure for iteration over bitmaps |
| 3151 class CMBitMapClosure : public BitMapClosure { | |
| 3152 private: | |
| 3153 // the bitmap that is being iterated over | |
| 3154 CMBitMap* _nextMarkBitMap; | |
| 3155 ConcurrentMark* _cm; | |
| 3156 CMTask* _task; | |
| 3157 | |
| 3158 public: | |
|
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3159 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3160 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
| 342 | 3161 |
| 3162 bool do_bit(size_t offset) { | |
| 3163 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
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3164 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3165 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3166 |
|
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3167 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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3168 assert(addr >= _task->finger(), "invariant"); |
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3169 |
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3170 // We move that task's local finger along. |
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3171 _task->move_finger_to(addr); |
| 342 | 3172 |
| 3173 _task->scan_object(oop(addr)); | |
| 3174 // we only partially drain the local queue and global stack | |
| 3175 _task->drain_local_queue(true); | |
| 3176 _task->drain_global_stack(true); | |
| 3177 | |
| 3178 // if the has_aborted flag has been raised, we need to bail out of | |
| 3179 // the iteration | |
| 3180 return !_task->has_aborted(); | |
| 3181 } | |
| 3182 }; | |
| 3183 | |
| 3184 // Closure for iterating over objects, currently only used for | |
| 3185 // processing SATB buffers. | |
| 3186 class CMObjectClosure : public ObjectClosure { | |
| 3187 private: | |
| 3188 CMTask* _task; | |
| 3189 | |
| 3190 public: | |
| 3191 void do_object(oop obj) { | |
| 3192 _task->deal_with_reference(obj); | |
| 3193 } | |
| 3194 | |
| 3195 CMObjectClosure(CMTask* task) : _task(task) { } | |
| 3196 }; | |
| 3197 | |
| 3771 | 3198 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 3199 ConcurrentMark* cm, | |
| 3200 CMTask* task) | |
| 3201 : _g1h(g1h), _cm(cm), _task(task) { | |
| 3202 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 3203 | |
| 3204 if (G1UseConcMarkReferenceProcessing) { | |
|
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3205 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 3206 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 3207 } |
| 3771 | 3208 } |
| 342 | 3209 |
| 3210 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3211 // Separated the asserts so that we know which one fires. |
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3212 assert(hr != NULL, |
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3213 "claim_region() should have filtered out continues humongous regions"); |
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3214 assert(!hr->continuesHumongous(), |
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3215 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 3216 |
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|
3217 if (_cm->verbose_low()) { |
| 342 | 3218 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
| 3219 _task_id, hr); | |
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|
3220 } |
| 342 | 3221 |
| 3222 _curr_region = hr; | |
| 3223 _finger = hr->bottom(); | |
| 3224 update_region_limit(); | |
| 3225 } | |
| 3226 | |
| 3227 void CMTask::update_region_limit() { | |
| 3228 HeapRegion* hr = _curr_region; | |
| 3229 HeapWord* bottom = hr->bottom(); | |
| 3230 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 3231 | |
| 3232 if (limit == bottom) { | |
|
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|
3233 if (_cm->verbose_low()) { |
| 342 | 3234 gclog_or_tty->print_cr("[%d] found an empty region " |
| 3235 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 3236 _task_id, bottom, limit); | |
|
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|
3237 } |
| 342 | 3238 // The region was collected underneath our feet. |
| 3239 // We set the finger to bottom to ensure that the bitmap | |
| 3240 // iteration that will follow this will not do anything. | |
| 3241 // (this is not a condition that holds when we set the region up, | |
| 3242 // as the region is not supposed to be empty in the first place) | |
| 3243 _finger = bottom; | |
| 3244 } else if (limit >= _region_limit) { | |
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3245 assert(limit >= _finger, "peace of mind"); |
| 342 | 3246 } else { |
|
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|
3247 assert(limit < _region_limit, "only way to get here"); |
| 342 | 3248 // This can happen under some pretty unusual circumstances. An |
| 3249 // evacuation pause empties the region underneath our feet (NTAMS | |
| 3250 // at bottom). We then do some allocation in the region (NTAMS | |
| 3251 // stays at bottom), followed by the region being used as a GC | |
| 3252 // alloc region (NTAMS will move to top() and the objects | |
| 3253 // originally below it will be grayed). All objects now marked in | |
| 3254 // the region are explicitly grayed, if below the global finger, | |
| 3255 // and we do not need in fact to scan anything else. So, we simply | |
| 3256 // set _finger to be limit to ensure that the bitmap iteration | |
| 3257 // doesn't do anything. | |
| 3258 _finger = limit; | |
| 3259 } | |
| 3260 | |
| 3261 _region_limit = limit; | |
| 3262 } | |
| 3263 | |
| 3264 void CMTask::giveup_current_region() { | |
|
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3265 assert(_curr_region != NULL, "invariant"); |
|
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|
3266 if (_cm->verbose_low()) { |
| 342 | 3267 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
| 3268 _task_id, _curr_region); | |
|
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|
3269 } |
| 342 | 3270 clear_region_fields(); |
| 3271 } | |
| 3272 | |
| 3273 void CMTask::clear_region_fields() { | |
| 3274 // Values for these three fields that indicate that we're not | |
| 3275 // holding on to a region. | |
| 3276 _curr_region = NULL; | |
| 3277 _finger = NULL; | |
| 3278 _region_limit = NULL; | |
| 3279 } | |
| 3280 | |
| 3771 | 3281 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 3282 if (cm_oop_closure == NULL) { | |
| 3283 assert(_cm_oop_closure != NULL, "invariant"); | |
| 3284 } else { | |
| 3285 assert(_cm_oop_closure == NULL, "invariant"); | |
| 3286 } | |
| 3287 _cm_oop_closure = cm_oop_closure; | |
| 3288 } | |
| 3289 | |
| 342 | 3290 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3291 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 3292 |
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|
3293 if (_cm->verbose_low()) { |
| 342 | 3294 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
|
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|
3295 } |
| 342 | 3296 |
| 3297 _nextMarkBitMap = nextMarkBitMap; | |
| 3298 clear_region_fields(); | |
| 3299 | |
| 3300 _calls = 0; | |
| 3301 _elapsed_time_ms = 0.0; | |
| 3302 _termination_time_ms = 0.0; | |
| 3303 _termination_start_time_ms = 0.0; | |
| 3304 | |
| 3305 #if _MARKING_STATS_ | |
| 3306 _local_pushes = 0; | |
| 3307 _local_pops = 0; | |
| 3308 _local_max_size = 0; | |
| 3309 _objs_scanned = 0; | |
| 3310 _global_pushes = 0; | |
| 3311 _global_pops = 0; | |
| 3312 _global_max_size = 0; | |
| 3313 _global_transfers_to = 0; | |
| 3314 _global_transfers_from = 0; | |
| 3315 _regions_claimed = 0; | |
| 3316 _objs_found_on_bitmap = 0; | |
| 3317 _satb_buffers_processed = 0; | |
| 3318 _steal_attempts = 0; | |
| 3319 _steals = 0; | |
| 3320 _aborted = 0; | |
| 3321 _aborted_overflow = 0; | |
| 3322 _aborted_cm_aborted = 0; | |
| 3323 _aborted_yield = 0; | |
| 3324 _aborted_timed_out = 0; | |
| 3325 _aborted_satb = 0; | |
| 3326 _aborted_termination = 0; | |
| 3327 #endif // _MARKING_STATS_ | |
| 3328 } | |
| 3329 | |
| 3330 bool CMTask::should_exit_termination() { | |
| 3331 regular_clock_call(); | |
| 3332 // This is called when we are in the termination protocol. We should | |
| 3333 // quit if, for some reason, this task wants to abort or the global | |
| 3334 // stack is not empty (this means that we can get work from it). | |
| 3335 return !_cm->mark_stack_empty() || has_aborted(); | |
| 3336 } | |
| 3337 | |
| 3338 void CMTask::reached_limit() { | |
|
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3339 assert(_words_scanned >= _words_scanned_limit || |
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3340 _refs_reached >= _refs_reached_limit , |
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|
3341 "shouldn't have been called otherwise"); |
| 342 | 3342 regular_clock_call(); |
| 3343 } | |
| 3344 | |
| 3345 void CMTask::regular_clock_call() { | |
|
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3346 if (has_aborted()) return; |
| 342 | 3347 |
| 3348 // First, we need to recalculate the words scanned and refs reached | |
| 3349 // limits for the next clock call. | |
| 3350 recalculate_limits(); | |
| 3351 | |
| 3352 // During the regular clock call we do the following | |
| 3353 | |
| 3354 // (1) If an overflow has been flagged, then we abort. | |
| 3355 if (_cm->has_overflown()) { | |
| 3356 set_has_aborted(); | |
| 3357 return; | |
| 3358 } | |
| 3359 | |
| 3360 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 3361 // to check anything else. The other steps are only needed during | |
| 3362 // the concurrent marking phase. | |
|
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|
3363 if (!concurrent()) return; |
| 342 | 3364 |
| 3365 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 3366 if (_cm->has_aborted()) { | |
| 3367 set_has_aborted(); | |
| 3368 statsOnly( ++_aborted_cm_aborted ); | |
| 3369 return; | |
| 3370 } | |
| 3371 | |
| 3372 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 3373 | |
| 3374 // (3) If marking stats are enabled, then we update the step history. | |
| 3375 #if _MARKING_STATS_ | |
|
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3376 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 3377 ++_clock_due_to_scanning; |
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|
3378 } |
|
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3379 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 3380 ++_clock_due_to_marking; |
|
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|
3381 } |
| 342 | 3382 |
| 3383 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 3384 _interval_start_time_ms = curr_time_ms; | |
| 3385 _all_clock_intervals_ms.add(last_interval_ms); | |
| 3386 | |
| 3387 if (_cm->verbose_medium()) { | |
|
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3388 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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3389 "scanned = %d%s, refs reached = %d%s", |
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3390 _task_id, last_interval_ms, |
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3391 _words_scanned, |
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3392 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3393 _refs_reached, |
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3394 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 3395 } |
| 3396 #endif // _MARKING_STATS_ | |
| 3397 | |
| 3398 // (4) We check whether we should yield. If we have to, then we abort. | |
| 3399 if (_cm->should_yield()) { | |
| 3400 // We should yield. To do this we abort the task. The caller is | |
| 3401 // responsible for yielding. | |
| 3402 set_has_aborted(); | |
| 3403 statsOnly( ++_aborted_yield ); | |
| 3404 return; | |
| 3405 } | |
| 3406 | |
| 3407 // (5) We check whether we've reached our time quota. If we have, | |
| 3408 // then we abort. | |
| 3409 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 3410 if (elapsed_time_ms > _time_target_ms) { | |
| 3411 set_has_aborted(); | |
|
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3412 _has_timed_out = true; |
| 342 | 3413 statsOnly( ++_aborted_timed_out ); |
| 3414 return; | |
| 3415 } | |
| 3416 | |
| 3417 // (6) Finally, we check whether there are enough completed STAB | |
| 3418 // buffers available for processing. If there are, we abort. | |
| 3419 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3420 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3421 if (_cm->verbose_low()) { |
| 342 | 3422 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
| 3423 _task_id); | |
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3424 } |
| 342 | 3425 // we do need to process SATB buffers, we'll abort and restart |
| 3426 // the marking task to do so | |
| 3427 set_has_aborted(); | |
| 3428 statsOnly( ++_aborted_satb ); | |
| 3429 return; | |
| 3430 } | |
| 3431 } | |
| 3432 | |
| 3433 void CMTask::recalculate_limits() { | |
| 3434 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 3435 _words_scanned_limit = _real_words_scanned_limit; | |
| 3436 | |
| 3437 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 3438 _refs_reached_limit = _real_refs_reached_limit; | |
| 3439 } | |
| 3440 | |
| 3441 void CMTask::decrease_limits() { | |
| 3442 // This is called when we believe that we're going to do an infrequent | |
| 3443 // operation which will increase the per byte scanned cost (i.e. move | |
| 3444 // entries to/from the global stack). It basically tries to decrease the | |
| 3445 // scanning limit so that the clock is called earlier. | |
| 3446 | |
|
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3447 if (_cm->verbose_medium()) { |
| 342 | 3448 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
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3449 } |
| 342 | 3450 |
| 3451 _words_scanned_limit = _real_words_scanned_limit - | |
| 3452 3 * words_scanned_period / 4; | |
| 3453 _refs_reached_limit = _real_refs_reached_limit - | |
| 3454 3 * refs_reached_period / 4; | |
| 3455 } | |
| 3456 | |
| 3457 void CMTask::move_entries_to_global_stack() { | |
| 3458 // local array where we'll store the entries that will be popped | |
| 3459 // from the local queue | |
| 3460 oop buffer[global_stack_transfer_size]; | |
| 3461 | |
| 3462 int n = 0; | |
| 3463 oop obj; | |
| 3464 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 3465 buffer[n] = obj; | |
| 3466 ++n; | |
| 3467 } | |
| 3468 | |
| 3469 if (n > 0) { | |
| 3470 // we popped at least one entry from the local queue | |
| 3471 | |
| 3472 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 3473 | |
| 3474 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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3475 if (_cm->verbose_low()) { |
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3476 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
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3477 _task_id); |
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3478 } |
| 342 | 3479 set_has_aborted(); |
| 3480 } else { | |
| 3481 // the transfer was successful | |
| 3482 | |
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3483 if (_cm->verbose_medium()) { |
| 342 | 3484 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
| 3485 _task_id, n); | |
|
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3486 } |
| 342 | 3487 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3488 if (tmp_size > _global_max_size) { |
| 342 | 3489 _global_max_size = tmp_size; |
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3490 } |
| 342 | 3491 _global_pushes += n ); |
| 3492 } | |
| 3493 } | |
| 3494 | |
| 3495 // this operation was quite expensive, so decrease the limits | |
| 3496 decrease_limits(); | |
| 3497 } | |
| 3498 | |
| 3499 void CMTask::get_entries_from_global_stack() { | |
| 3500 // local array where we'll store the entries that will be popped | |
| 3501 // from the global stack. | |
| 3502 oop buffer[global_stack_transfer_size]; | |
| 3503 int n; | |
| 3504 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
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3505 assert(n <= global_stack_transfer_size, |
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3506 "we should not pop more than the given limit"); |
| 342 | 3507 if (n > 0) { |
| 3508 // yes, we did actually pop at least one entry | |
| 3509 | |
| 3510 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3511 if (_cm->verbose_medium()) { |
| 342 | 3512 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
| 3513 _task_id, n); | |
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3514 } |
| 342 | 3515 for (int i = 0; i < n; ++i) { |
| 3516 bool success = _task_queue->push(buffer[i]); | |
| 3517 // We only call this when the local queue is empty or under a | |
| 3518 // given target limit. So, we do not expect this push to fail. | |
|
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3519 assert(success, "invariant"); |
| 342 | 3520 } |
| 3521 | |
| 3522 statsOnly( int tmp_size = _task_queue->size(); | |
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3523 if (tmp_size > _local_max_size) { |
| 342 | 3524 _local_max_size = tmp_size; |
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3525 } |
| 342 | 3526 _local_pushes += n ); |
| 3527 } | |
| 3528 | |
| 3529 // this operation was quite expensive, so decrease the limits | |
| 3530 decrease_limits(); | |
| 3531 } | |
| 3532 | |
| 3533 void CMTask::drain_local_queue(bool partially) { | |
|
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3534 if (has_aborted()) return; |
| 342 | 3535 |
| 3536 // Decide what the target size is, depending whether we're going to | |
| 3537 // drain it partially (so that other tasks can steal if they run out | |
| 3538 // of things to do) or totally (at the very end). | |
| 3539 size_t target_size; | |
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3540 if (partially) { |
| 342 | 3541 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3542 } else { |
| 342 | 3543 target_size = 0; |
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3544 } |
| 342 | 3545 |
| 3546 if (_task_queue->size() > target_size) { | |
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3547 if (_cm->verbose_high()) { |
| 342 | 3548 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
| 3549 _task_id, target_size); | |
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3550 } |
| 342 | 3551 |
| 3552 oop obj; | |
| 3553 bool ret = _task_queue->pop_local(obj); | |
| 3554 while (ret) { | |
| 3555 statsOnly( ++_local_pops ); | |
| 3556 | |
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3557 if (_cm->verbose_high()) { |
| 342 | 3558 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
| 3559 (void*) obj); | |
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3560 } |
| 342 | 3561 |
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3562 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 3563 assert(!_g1h->is_on_master_free_list( |
| 2152 | 3564 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 3565 |
| 3566 scan_object(obj); | |
| 3567 | |
|
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3568 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 3569 ret = false; |
|
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3570 } else { |
| 342 | 3571 ret = _task_queue->pop_local(obj); |
|
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3572 } |
| 342 | 3573 } |
| 3574 | |
|
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3575 if (_cm->verbose_high()) { |
| 342 | 3576 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
| 3577 _task_id, _task_queue->size()); | |
|
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3578 } |
| 342 | 3579 } |
| 3580 } | |
| 3581 | |
| 3582 void CMTask::drain_global_stack(bool partially) { | |
|
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3583 if (has_aborted()) return; |
| 342 | 3584 |
| 3585 // We have a policy to drain the local queue before we attempt to | |
| 3586 // drain the global stack. | |
|
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3587 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 3588 |
| 3589 // Decide what the target size is, depending whether we're going to | |
| 3590 // drain it partially (so that other tasks can steal if they run out | |
| 3591 // of things to do) or totally (at the very end). Notice that, | |
| 3592 // because we move entries from the global stack in chunks or | |
| 3593 // because another task might be doing the same, we might in fact | |
| 3594 // drop below the target. But, this is not a problem. | |
| 3595 size_t target_size; | |
|
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3596 if (partially) { |
| 342 | 3597 target_size = _cm->partial_mark_stack_size_target(); |
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3598 } else { |
| 342 | 3599 target_size = 0; |
|
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3600 } |
| 342 | 3601 |
| 3602 if (_cm->mark_stack_size() > target_size) { | |
|
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3603 if (_cm->verbose_low()) { |
| 342 | 3604 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
| 3605 _task_id, target_size); | |
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3606 } |
| 342 | 3607 |
| 3608 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 3609 get_entries_from_global_stack(); | |
| 3610 drain_local_queue(partially); | |
| 3611 } | |
| 3612 | |
|
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3613 if (_cm->verbose_low()) { |
| 342 | 3614 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
| 3615 _task_id, _cm->mark_stack_size()); | |
|
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3616 } |
| 342 | 3617 } |
| 3618 } | |
| 3619 | |
| 3620 // SATB Queue has several assumptions on whether to call the par or | |
| 3621 // non-par versions of the methods. this is why some of the code is | |
| 3622 // replicated. We should really get rid of the single-threaded version | |
| 3623 // of the code to simplify things. | |
| 3624 void CMTask::drain_satb_buffers() { | |
|
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3625 if (has_aborted()) return; |
| 342 | 3626 |
| 3627 // We set this so that the regular clock knows that we're in the | |
| 3628 // middle of draining buffers and doesn't set the abort flag when it | |
| 3629 // notices that SATB buffers are available for draining. It'd be | |
| 3630 // very counter productive if it did that. :-) | |
| 3631 _draining_satb_buffers = true; | |
| 3632 | |
| 3633 CMObjectClosure oc(this); | |
| 3634 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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3635 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3636 satb_mq_set.set_par_closure(_task_id, &oc); |
|
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3637 } else { |
| 342 | 3638 satb_mq_set.set_closure(&oc); |
|
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3639 } |
| 342 | 3640 |
| 3641 // This keeps claiming and applying the closure to completed buffers | |
| 3642 // until we run out of buffers or we need to abort. | |
|
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3643 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3644 while (!has_aborted() && |
| 3645 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
|
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3646 if (_cm->verbose_medium()) { |
| 342 | 3647 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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3648 } |
| 342 | 3649 statsOnly( ++_satb_buffers_processed ); |
| 3650 regular_clock_call(); | |
| 3651 } | |
| 3652 } else { | |
| 3653 while (!has_aborted() && | |
| 3654 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3655 if (_cm->verbose_medium()) { |
| 342 | 3656 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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3657 } |
| 342 | 3658 statsOnly( ++_satb_buffers_processed ); |
| 3659 regular_clock_call(); | |
| 3660 } | |
| 3661 } | |
| 3662 | |
| 3663 if (!concurrent() && !has_aborted()) { | |
| 3664 // We should only do this during remark. | |
|
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3665 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3666 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
|
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3667 } else { |
| 342 | 3668 satb_mq_set.iterate_closure_all_threads(); |
|
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3669 } |
| 342 | 3670 } |
| 3671 | |
| 3672 _draining_satb_buffers = false; | |
| 3673 | |
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3674 assert(has_aborted() || |
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3675 concurrent() || |
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3676 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 3677 |
|
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|
3678 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3679 satb_mq_set.set_par_closure(_task_id, NULL); |
|
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3680 } else { |
| 342 | 3681 satb_mq_set.set_closure(NULL); |
|
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3682 } |
| 342 | 3683 |
| 3684 // again, this was a potentially expensive operation, decrease the | |
| 3685 // limits to get the regular clock call early | |
| 3686 decrease_limits(); | |
| 3687 } | |
| 3688 | |
| 3689 void CMTask::print_stats() { | |
| 3690 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
| 3691 _task_id, _calls); | |
| 3692 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
| 3693 _elapsed_time_ms, _termination_time_ms); | |
| 3694 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 3695 _step_times_ms.num(), _step_times_ms.avg(), | |
| 3696 _step_times_ms.sd()); | |
| 3697 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 3698 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 3699 | |
| 3700 #if _MARKING_STATS_ | |
| 3701 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 3702 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 3703 _all_clock_intervals_ms.sd()); | |
| 3704 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 3705 _all_clock_intervals_ms.maximum(), | |
| 3706 _all_clock_intervals_ms.sum()); | |
| 3707 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 3708 _clock_due_to_scanning, _clock_due_to_marking); | |
| 3709 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 3710 _objs_scanned, _objs_found_on_bitmap); | |
| 3711 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 3712 _local_pushes, _local_pops, _local_max_size); | |
| 3713 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 3714 _global_pushes, _global_pops, _global_max_size); | |
| 3715 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 3716 _global_transfers_to,_global_transfers_from); | |
|
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3717 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
| 342 | 3718 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
| 3719 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 3720 _steal_attempts, _steals); | |
| 3721 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 3722 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 3723 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 3724 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 3725 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 3726 #endif // _MARKING_STATS_ | |
| 3727 } | |
| 3728 | |
| 3729 /***************************************************************************** | |
| 3730 | |
| 3731 The do_marking_step(time_target_ms) method is the building block | |
| 3732 of the parallel marking framework. It can be called in parallel | |
| 3733 with other invocations of do_marking_step() on different tasks | |
| 3734 (but only one per task, obviously) and concurrently with the | |
| 3735 mutator threads, or during remark, hence it eliminates the need | |
| 3736 for two versions of the code. When called during remark, it will | |
| 3737 pick up from where the task left off during the concurrent marking | |
| 3738 phase. Interestingly, tasks are also claimable during evacuation | |
| 3739 pauses too, since do_marking_step() ensures that it aborts before | |
| 3740 it needs to yield. | |
| 3741 | |
| 3742 The data structures that is uses to do marking work are the | |
| 3743 following: | |
| 3744 | |
| 3745 (1) Marking Bitmap. If there are gray objects that appear only | |
| 3746 on the bitmap (this happens either when dealing with an overflow | |
| 3747 or when the initial marking phase has simply marked the roots | |
| 3748 and didn't push them on the stack), then tasks claim heap | |
| 3749 regions whose bitmap they then scan to find gray objects. A | |
| 3750 global finger indicates where the end of the last claimed region | |
| 3751 is. A local finger indicates how far into the region a task has | |
| 3752 scanned. The two fingers are used to determine how to gray an | |
| 3753 object (i.e. whether simply marking it is OK, as it will be | |
| 3754 visited by a task in the future, or whether it needs to be also | |
| 3755 pushed on a stack). | |
| 3756 | |
| 3757 (2) Local Queue. The local queue of the task which is accessed | |
| 3758 reasonably efficiently by the task. Other tasks can steal from | |
| 3759 it when they run out of work. Throughout the marking phase, a | |
| 3760 task attempts to keep its local queue short but not totally | |
| 3761 empty, so that entries are available for stealing by other | |
| 3762 tasks. Only when there is no more work, a task will totally | |
| 3763 drain its local queue. | |
| 3764 | |
| 3765 (3) Global Mark Stack. This handles local queue overflow. During | |
| 3766 marking only sets of entries are moved between it and the local | |
| 3767 queues, as access to it requires a mutex and more fine-grain | |
| 3768 interaction with it which might cause contention. If it | |
| 3769 overflows, then the marking phase should restart and iterate | |
| 3770 over the bitmap to identify gray objects. Throughout the marking | |
| 3771 phase, tasks attempt to keep the global mark stack at a small | |
| 3772 length but not totally empty, so that entries are available for | |
| 3773 popping by other tasks. Only when there is no more work, tasks | |
| 3774 will totally drain the global mark stack. | |
| 3775 | |
|
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3776 (4) SATB Buffer Queue. This is where completed SATB buffers are |
| 342 | 3777 made available. Buffers are regularly removed from this queue |
| 3778 and scanned for roots, so that the queue doesn't get too | |
| 3779 long. During remark, all completed buffers are processed, as | |
| 3780 well as the filled in parts of any uncompleted buffers. | |
| 3781 | |
| 3782 The do_marking_step() method tries to abort when the time target | |
| 3783 has been reached. There are a few other cases when the | |
| 3784 do_marking_step() method also aborts: | |
| 3785 | |
| 3786 (1) When the marking phase has been aborted (after a Full GC). | |
| 3787 | |
|
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3788 (2) When a global overflow (on the global stack) has been |
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3789 triggered. Before the task aborts, it will actually sync up with |
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3790 the other tasks to ensure that all the marking data structures |
|
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3791 (local queues, stacks, fingers etc.) are re-initialised so that |
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3792 when do_marking_step() completes, the marking phase can |
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3793 immediately restart. |
| 342 | 3794 |
| 3795 (3) When enough completed SATB buffers are available. The | |
| 3796 do_marking_step() method only tries to drain SATB buffers right | |
| 3797 at the beginning. So, if enough buffers are available, the | |
| 3798 marking step aborts and the SATB buffers are processed at | |
| 3799 the beginning of the next invocation. | |
| 3800 | |
| 3801 (4) To yield. when we have to yield then we abort and yield | |
| 3802 right at the end of do_marking_step(). This saves us from a lot | |
| 3803 of hassle as, by yielding we might allow a Full GC. If this | |
| 3804 happens then objects will be compacted underneath our feet, the | |
| 3805 heap might shrink, etc. We save checking for this by just | |
| 3806 aborting and doing the yield right at the end. | |
| 3807 | |
| 3808 From the above it follows that the do_marking_step() method should | |
| 3809 be called in a loop (or, otherwise, regularly) until it completes. | |
| 3810 | |
| 3811 If a marking step completes without its has_aborted() flag being | |
| 3812 true, it means it has completed the current marking phase (and | |
| 3813 also all other marking tasks have done so and have all synced up). | |
| 3814 | |
| 3815 A method called regular_clock_call() is invoked "regularly" (in | |
| 3816 sub ms intervals) throughout marking. It is this clock method that | |
| 3817 checks all the abort conditions which were mentioned above and | |
| 3818 decides when the task should abort. A work-based scheme is used to | |
| 3819 trigger this clock method: when the number of object words the | |
| 3820 marking phase has scanned or the number of references the marking | |
| 3821 phase has visited reach a given limit. Additional invocations to | |
| 3822 the method clock have been planted in a few other strategic places | |
| 3823 too. The initial reason for the clock method was to avoid calling | |
| 3824 vtime too regularly, as it is quite expensive. So, once it was in | |
| 3825 place, it was natural to piggy-back all the other conditions on it | |
| 3826 too and not constantly check them throughout the code. | |
| 3827 | |
| 3828 *****************************************************************************/ | |
| 3829 | |
|
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3830 void CMTask::do_marking_step(double time_target_ms, |
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3831 bool do_stealing, |
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3832 bool do_termination) { |
|
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3833 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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3834 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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3835 |
| 342 | 3836 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
|
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3837 assert(_task_queues != NULL, "invariant"); |
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3838 assert(_task_queue != NULL, "invariant"); |
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3839 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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3840 |
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3841 assert(!_claimed, |
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3842 "only one thread should claim this task at any one time"); |
| 342 | 3843 |
| 3844 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 3845 // possible for two threads to set the _claimed flag at the same | |
| 3846 // time. But it is only for debugging purposes anyway and it will | |
| 3847 // catch most problems. | |
| 3848 _claimed = true; | |
| 3849 | |
| 3850 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 3851 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 3852 | |
| 3853 double diff_prediction_ms = | |
| 3854 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 3855 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 3856 | |
| 3857 // set up the variables that are used in the work-based scheme to | |
| 3858 // call the regular clock method | |
| 3859 _words_scanned = 0; | |
| 3860 _refs_reached = 0; | |
| 3861 recalculate_limits(); | |
| 3862 | |
| 3863 // clear all flags | |
| 3864 clear_has_aborted(); | |
|
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3865 _has_timed_out = false; |
| 342 | 3866 _draining_satb_buffers = false; |
| 3867 | |
| 3868 ++_calls; | |
| 3869 | |
|
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3870 if (_cm->verbose_low()) { |
| 342 | 3871 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
| 3872 "target = %1.2lfms >>>>>>>>>>", | |
| 3873 _task_id, _calls, _time_target_ms); | |
|
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3874 } |
| 342 | 3875 |
| 3876 // Set up the bitmap and oop closures. Anything that uses them is | |
| 3877 // eventually called from this method, so it is OK to allocate these | |
| 3878 // statically. | |
| 3879 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 3880 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 3881 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 3882 |
| 3883 if (_cm->has_overflown()) { | |
|
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3884 // This can happen if the mark stack overflows during a GC pause |
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3885 // and this task, after a yield point, restarts. We have to abort |
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3886 // as we need to get into the overflow protocol which happens |
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3887 // right at the end of this task. |
| 342 | 3888 set_has_aborted(); |
| 3889 } | |
| 3890 | |
| 3891 // First drain any available SATB buffers. After this, we will not | |
| 3892 // look at SATB buffers before the next invocation of this method. | |
| 3893 // If enough completed SATB buffers are queued up, the regular clock | |
| 3894 // will abort this task so that it restarts. | |
| 3895 drain_satb_buffers(); | |
| 3896 // ...then partially drain the local queue and the global stack | |
| 3897 drain_local_queue(true); | |
| 3898 drain_global_stack(true); | |
| 3899 | |
| 3900 do { | |
| 3901 if (!has_aborted() && _curr_region != NULL) { | |
| 3902 // This means that we're already holding on to a region. | |
|
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3903 assert(_finger != NULL, "if region is not NULL, then the finger " |
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3904 "should not be NULL either"); |
| 342 | 3905 |
| 3906 // We might have restarted this task after an evacuation pause | |
| 3907 // which might have evacuated the region we're holding on to | |
| 3908 // underneath our feet. Let's read its limit again to make sure | |
| 3909 // that we do not iterate over a region of the heap that | |
| 3910 // contains garbage (update_region_limit() will also move | |
| 3911 // _finger to the start of the region if it is found empty). | |
| 3912 update_region_limit(); | |
| 3913 // We will start from _finger not from the start of the region, | |
| 3914 // as we might be restarting this task after aborting half-way | |
| 3915 // through scanning this region. In this case, _finger points to | |
| 3916 // the address where we last found a marked object. If this is a | |
| 3917 // fresh region, _finger points to start(). | |
| 3918 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 3919 | |
|
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3920 if (_cm->verbose_low()) { |
| 342 | 3921 gclog_or_tty->print_cr("[%d] we're scanning part " |
| 3922 "["PTR_FORMAT", "PTR_FORMAT") " | |
| 3923 "of region "PTR_FORMAT, | |
| 3924 _task_id, _finger, _region_limit, _curr_region); | |
|
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3925 } |
| 342 | 3926 |
| 3927 // Let's iterate over the bitmap of the part of the | |
| 3928 // region that is left. | |
|
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3929 if (mr.is_empty() || _nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
| 342 | 3930 // We successfully completed iterating over the region. Now, |
| 3931 // let's give up the region. | |
| 3932 giveup_current_region(); | |
| 3933 regular_clock_call(); | |
| 3934 } else { | |
|
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3935 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 3936 // The only way to abort the bitmap iteration is to return |
| 3937 // false from the do_bit() method. However, inside the | |
| 3938 // do_bit() method we move the _finger to point to the | |
| 3939 // object currently being looked at. So, if we bail out, we | |
| 3940 // have definitely set _finger to something non-null. | |
|
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3941 assert(_finger != NULL, "invariant"); |
| 342 | 3942 |
| 3943 // Region iteration was actually aborted. So now _finger | |
| 3944 // points to the address of the object we last scanned. If we | |
| 3945 // leave it there, when we restart this task, we will rescan | |
| 3946 // the object. It is easy to avoid this. We move the finger by | |
| 3947 // enough to point to the next possible object header (the | |
| 3948 // bitmap knows by how much we need to move it as it knows its | |
| 3949 // granularity). | |
|
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3950 assert(_finger < _region_limit, "invariant"); |
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3951 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
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3952 // Check if bitmap iteration was aborted while scanning the last object |
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3953 if (new_finger >= _region_limit) { |
|
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3954 giveup_current_region(); |
|
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3955 } else { |
|
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3956 move_finger_to(new_finger); |
|
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3957 } |
| 342 | 3958 } |
| 3959 } | |
| 3960 // At this point we have either completed iterating over the | |
| 3961 // region we were holding on to, or we have aborted. | |
| 3962 | |
| 3963 // We then partially drain the local queue and the global stack. | |
| 3964 // (Do we really need this?) | |
| 3965 drain_local_queue(true); | |
| 3966 drain_global_stack(true); | |
| 3967 | |
| 3968 // Read the note on the claim_region() method on why it might | |
| 3969 // return NULL with potentially more regions available for | |
| 3970 // claiming and why we have to check out_of_regions() to determine | |
| 3971 // whether we're done or not. | |
| 3972 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 3973 // We are going to try to claim a new region. We should have | |
| 3974 // given up on the previous one. | |
|
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3975 // Separated the asserts so that we know which one fires. |
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3976 assert(_curr_region == NULL, "invariant"); |
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3977 assert(_finger == NULL, "invariant"); |
|
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3978 assert(_region_limit == NULL, "invariant"); |
|
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|
3979 if (_cm->verbose_low()) { |
| 342 | 3980 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
|
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|
3981 } |
| 342 | 3982 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
| 3983 if (claimed_region != NULL) { | |
| 3984 // Yes, we managed to claim one | |
| 3985 statsOnly( ++_regions_claimed ); | |
| 3986 | |
|
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|
3987 if (_cm->verbose_low()) { |
| 342 | 3988 gclog_or_tty->print_cr("[%d] we successfully claimed " |
| 3989 "region "PTR_FORMAT, | |
| 3990 _task_id, claimed_region); | |
|
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|
3991 } |
| 342 | 3992 |
| 3993 setup_for_region(claimed_region); | |
|
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|
3994 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 3995 } |
| 3996 // It is important to call the regular clock here. It might take | |
| 3997 // a while to claim a region if, for example, we hit a large | |
| 3998 // block of empty regions. So we need to call the regular clock | |
| 3999 // method once round the loop to make sure it's called | |
| 4000 // frequently enough. | |
| 4001 regular_clock_call(); | |
| 4002 } | |
| 4003 | |
| 4004 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
4005 assert(_cm->out_of_regions(), |
|
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|
4006 "at this point we should be out of regions"); |
| 342 | 4007 } |
| 4008 } while ( _curr_region != NULL && !has_aborted()); | |
| 4009 | |
| 4010 if (!has_aborted()) { | |
| 4011 // We cannot check whether the global stack is empty, since other | |
|
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4012 // tasks might be pushing objects to it concurrently. |
|
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|
4013 assert(_cm->out_of_regions(), |
|
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|
4014 "at this point we should be out of regions"); |
| 342 | 4015 |
|
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|
4016 if (_cm->verbose_low()) { |
| 342 | 4017 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
|
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|
4018 } |
| 342 | 4019 |
| 4020 // Try to reduce the number of available SATB buffers so that | |
| 4021 // remark has less work to do. | |
| 4022 drain_satb_buffers(); | |
| 4023 } | |
| 4024 | |
| 4025 // Since we've done everything else, we can now totally drain the | |
| 4026 // local queue and global stack. | |
| 4027 drain_local_queue(false); | |
| 4028 drain_global_stack(false); | |
| 4029 | |
| 4030 // Attempt at work stealing from other task's queues. | |
|
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|
4031 if (do_stealing && !has_aborted()) { |
| 342 | 4032 // We have not aborted. This means that we have finished all that |
| 4033 // we could. Let's try to do some stealing... | |
| 4034 | |
| 4035 // We cannot check whether the global stack is empty, since other | |
|
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|
4036 // tasks might be pushing objects to it concurrently. |
|
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|
4037 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
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|
4038 "only way to reach here"); |
| 342 | 4039 |
|
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|
4040 if (_cm->verbose_low()) { |
| 342 | 4041 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
|
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|
4042 } |
| 342 | 4043 |
| 4044 while (!has_aborted()) { | |
| 4045 oop obj; | |
| 4046 statsOnly( ++_steal_attempts ); | |
| 4047 | |
| 4048 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
|
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|
4049 if (_cm->verbose_medium()) { |
| 342 | 4050 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
| 4051 _task_id, (void*) obj); | |
|
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|
4052 } |
| 342 | 4053 |
| 4054 statsOnly( ++_steals ); | |
| 4055 | |
|
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|
4056 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
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|
4057 "any stolen object should be marked"); |
| 342 | 4058 scan_object(obj); |
| 4059 | |
| 4060 // And since we're towards the end, let's totally drain the | |
| 4061 // local queue and global stack. | |
| 4062 drain_local_queue(false); | |
| 4063 drain_global_stack(false); | |
| 4064 } else { | |
| 4065 break; | |
| 4066 } | |
| 4067 } | |
| 4068 } | |
| 4069 | |
|
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|
4070 // If we are about to wrap up and go into termination, check if we |
|
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|
4071 // should raise the overflow flag. |
|
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|
4072 if (do_termination && !has_aborted()) { |
|
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|
4073 if (_cm->force_overflow()->should_force()) { |
|
cd8e33b2a8ad
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|
4074 _cm->set_has_overflown(); |
|
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|
4075 regular_clock_call(); |
|
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|
4076 } |
|
cd8e33b2a8ad
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|
4077 } |
|
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|
4078 |
| 342 | 4079 // We still haven't aborted. Now, let's try to get into the |
| 4080 // termination protocol. | |
|
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|
4081 if (do_termination && !has_aborted()) { |
| 342 | 4082 // We cannot check whether the global stack is empty, since other |
|
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|
4083 // tasks might be concurrently pushing objects on it. |
|
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|
4084 // Separated the asserts so that we know which one fires. |
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|
4085 assert(_cm->out_of_regions(), "only way to reach here"); |
|
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|
4086 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 4087 |
|
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|
4088 if (_cm->verbose_low()) { |
| 342 | 4089 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
|
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|
4090 } |
| 342 | 4091 |
| 4092 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4093 // The CMTask class also extends the TerminatorTerminator class, | |
| 4094 // hence its should_exit_termination() method will also decide | |
| 4095 // whether to exit the termination protocol or not. | |
| 4096 bool finished = _cm->terminator()->offer_termination(this); | |
| 4097 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
| 4098 _termination_time_ms += | |
| 4099 termination_end_time_ms - _termination_start_time_ms; | |
| 4100 | |
| 4101 if (finished) { | |
| 4102 // We're all done. | |
| 4103 | |
| 4104 if (_task_id == 0) { | |
| 4105 // let's allow task 0 to do this | |
| 4106 if (concurrent()) { | |
|
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|
4107 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 4108 // we need to set this to false before the next |
| 4109 // safepoint. This way we ensure that the marking phase | |
| 4110 // doesn't observe any more heap expansions. | |
| 4111 _cm->clear_concurrent_marking_in_progress(); | |
| 4112 } | |
| 4113 } | |
| 4114 | |
| 4115 // We can now guarantee that the global stack is empty, since | |
|
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|
4116 // all other tasks have finished. We separated the guarantees so |
|
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|
4117 // that, if a condition is false, we can immediately find out |
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|
4118 // which one. |
|
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|
4119 guarantee(_cm->out_of_regions(), "only way to reach here"); |
|
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|
4120 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
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|
4121 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
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|
4122 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
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|
4123 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
| 342 | 4124 |
|
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|
4125 if (_cm->verbose_low()) { |
| 342 | 4126 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
|
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|
4127 } |
| 342 | 4128 } else { |
| 4129 // Apparently there's more work to do. Let's abort this task. It | |
| 4130 // will restart it and we can hopefully find more things to do. | |
| 4131 | |
|
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|
4132 if (_cm->verbose_low()) { |
|
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|
4133 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
|
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|
4134 _task_id); |
|
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|
4135 } |
| 342 | 4136 |
| 4137 set_has_aborted(); | |
| 4138 statsOnly( ++_aborted_termination ); | |
| 4139 } | |
| 4140 } | |
| 4141 | |
| 4142 // Mainly for debugging purposes to make sure that a pointer to the | |
| 4143 // closure which was statically allocated in this frame doesn't | |
| 4144 // escape it by accident. | |
| 3771 | 4145 set_cm_oop_closure(NULL); |
| 342 | 4146 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 4147 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 4148 // Update the step history. | |
| 4149 _step_times_ms.add(elapsed_time_ms); | |
| 4150 | |
| 4151 if (has_aborted()) { | |
| 4152 // The task was aborted for some reason. | |
| 4153 | |
| 4154 statsOnly( ++_aborted ); | |
| 4155 | |
|
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|
4156 if (_has_timed_out) { |
| 342 | 4157 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 4158 // Keep statistics of how well we did with respect to hitting | |
| 4159 // our target only if we actually timed out (if we aborted for | |
| 4160 // other reasons, then the results might get skewed). | |
| 4161 _marking_step_diffs_ms.add(diff_ms); | |
| 4162 } | |
| 4163 | |
| 4164 if (_cm->has_overflown()) { | |
| 4165 // This is the interesting one. We aborted because a global | |
| 4166 // overflow was raised. This means we have to restart the | |
| 4167 // marking phase and start iterating over regions. However, in | |
| 4168 // order to do this we have to make sure that all tasks stop | |
| 4169 // what they are doing and re-initialise in a safe manner. We | |
| 4170 // will achieve this with the use of two barrier sync points. | |
| 4171 | |
|
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|
4172 if (_cm->verbose_low()) { |
| 342 | 4173 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
|
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|
4174 } |
| 342 | 4175 |
| 4176 _cm->enter_first_sync_barrier(_task_id); | |
| 4177 // When we exit this sync barrier we know that all tasks have | |
| 4178 // stopped doing marking work. So, it's now safe to | |
| 4179 // re-initialise our data structures. At the end of this method, | |
| 4180 // task 0 will clear the global data structures. | |
| 4181 | |
| 4182 statsOnly( ++_aborted_overflow ); | |
| 4183 | |
| 4184 // We clear the local state of this task... | |
| 4185 clear_region_fields(); | |
| 4186 | |
| 4187 // ...and enter the second barrier. | |
| 4188 _cm->enter_second_sync_barrier(_task_id); | |
| 4189 // At this point everything has bee re-initialised and we're | |
| 4190 // ready to restart. | |
| 4191 } | |
| 4192 | |
| 4193 if (_cm->verbose_low()) { | |
| 4194 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
| 4195 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4196 _task_id, _time_target_ms, elapsed_time_ms); | |
|
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|
4197 if (_cm->has_aborted()) { |
| 342 | 4198 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
| 4199 _task_id); | |
|
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|
4200 } |
| 342 | 4201 } |
| 4202 } else { | |
|
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|
4203 if (_cm->verbose_low()) { |
| 342 | 4204 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 4205 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4206 _task_id, _time_target_ms, elapsed_time_ms); | |
|
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|
4207 } |
| 342 | 4208 } |
| 4209 | |
| 4210 _claimed = false; | |
| 4211 } | |
| 4212 | |
| 4213 CMTask::CMTask(int task_id, | |
| 4214 ConcurrentMark* cm, | |
|
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|
4215 size_t* marked_bytes, |
|
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|
4216 BitMap* card_bm, |
| 342 | 4217 CMTaskQueue* task_queue, |
| 4218 CMTaskQueueSet* task_queues) | |
| 4219 : _g1h(G1CollectedHeap::heap()), | |
| 4220 _task_id(task_id), _cm(cm), | |
| 4221 _claimed(false), | |
| 4222 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 4223 _task_queue(task_queue), | |
| 4224 _task_queues(task_queues), | |
| 3771 | 4225 _cm_oop_closure(NULL), |
|
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|
4226 _marked_bytes_array(marked_bytes), |
|
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|
4227 _card_bm(card_bm) { |
|
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|
4228 guarantee(task_queue != NULL, "invariant"); |
|
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|
4229 guarantee(task_queues != NULL, "invariant"); |
| 342 | 4230 |
| 4231 statsOnly( _clock_due_to_scanning = 0; | |
| 4232 _clock_due_to_marking = 0 ); | |
| 4233 | |
| 4234 _marking_step_diffs_ms.add(0.5); | |
| 4235 } | |
|
2435
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|
4236 |
|
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|
4237 // These are formatting macros that are used below to ensure |
|
371bbc844bf1
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|
4238 // consistent formatting. The *_H_* versions are used to format the |
|
371bbc844bf1
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|
4239 // header for a particular value and they should be kept consistent |
|
371bbc844bf1
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|
4240 // with the corresponding macro. Also note that most of the macros add |
|
371bbc844bf1
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|
4241 // the necessary white space (as a prefix) which makes them a bit |
|
371bbc844bf1
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|
4242 // easier to compose. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4243 |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4244 // All the output lines are prefixed with this string to be able to |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4245 // identify them easily in a large log file. |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4246 #define G1PPRL_LINE_PREFIX "###" |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4247 |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4248 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4249 #ifdef _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4250 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4251 #else // _LP64 |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4252 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4253 #endif // _LP64 |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4254 |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4255 // For per-region info |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4256 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
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|
4257 #define G1PPRL_TYPE_H_FORMAT " %4s" |
|
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|
4258 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
|
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|
4259 #define G1PPRL_BYTE_H_FORMAT " %9s" |
|
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|
4260 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
|
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|
4261 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
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|
4262 |
|
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changeset
|
4263 // For summary info |
|
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|
4264 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
|
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|
4265 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
|
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|
4266 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
|
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|
4267 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
|
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|
4268 |
|
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changeset
|
4269 G1PrintRegionLivenessInfoClosure:: |
|
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|
4270 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
|
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|
4271 : _out(out), |
|
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|
4272 _total_used_bytes(0), _total_capacity_bytes(0), |
|
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|
4273 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
|
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|
4274 _hum_used_bytes(0), _hum_capacity_bytes(0), |
|
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|
4275 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
|
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|
4276 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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|
4277 MemRegion g1_committed = g1h->g1_committed(); |
|
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|
4278 MemRegion g1_reserved = g1h->g1_reserved(); |
|
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|
4279 double now = os::elapsedTime(); |
|
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|
4280 |
|
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changeset
|
4281 // Print the header of the output. |
|
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|
4282 _out->cr(); |
|
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|
4283 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
|
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|
4284 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
|
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|
4285 G1PPRL_SUM_ADDR_FORMAT("committed") |
|
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changeset
|
4286 G1PPRL_SUM_ADDR_FORMAT("reserved") |
|
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|
4287 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
|
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changeset
|
4288 g1_committed.start(), g1_committed.end(), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4289 g1_reserved.start(), g1_reserved.end(), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4290 HeapRegion::GrainBytes); |
|
2435
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|
4291 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4292 _out->print_cr(G1PPRL_LINE_PREFIX |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4293 G1PPRL_TYPE_H_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4294 G1PPRL_ADDR_BASE_H_FORMAT |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4295 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4296 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4297 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4298 G1PPRL_DOUBLE_H_FORMAT, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4299 "type", "address-range", |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4300 "used", "prev-live", "next-live", "gc-eff"); |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4301 _out->print_cr(G1PPRL_LINE_PREFIX |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
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changeset
|
4302 G1PPRL_TYPE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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changeset
|
4303 G1PPRL_ADDR_BASE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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changeset
|
4304 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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changeset
|
4305 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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changeset
|
4306 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
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3975
diff
changeset
|
4307 G1PPRL_DOUBLE_H_FORMAT, |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4308 "", "", |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4309 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4310 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4311 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4312 // It takes as a parameter a reference to one of the _hum_* fields, it |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4313 // deduces the corresponding value for a region in a humongous region |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4314 // series (either the region size, or what's left if the _hum_* field |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4315 // 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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changeset
|
4316 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4317 size_t bytes = 0; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4318 // The > 0 check is to deal with the prev and next live bytes which |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4319 // could be 0. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4320 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4321 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4322 *hum_bytes -= bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4323 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4324 return bytes; |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4325 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4326 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4327 // It deduces the values for a region in a humongous region series |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4328 // from the _hum_* fields and updates those accordingly. It assumes |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4329 // that that _hum_* fields have already been set up from the "starts |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4330 // humongous" region and we visit the regions in address order. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4331 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4332 size_t* capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4333 size_t* prev_live_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4334 size_t* next_live_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4335 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4336 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4337 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4338 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4339 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4340 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4341 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4342 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4343 const char* type = ""; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4344 HeapWord* bottom = r->bottom(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4345 HeapWord* end = r->end(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4346 size_t capacity_bytes = r->capacity(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4347 size_t used_bytes = r->used(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4348 size_t prev_live_bytes = r->live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4349 size_t next_live_bytes = r->next_live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4350 double gc_eff = r->gc_efficiency(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4351 if (r->used() == 0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4352 type = "FREE"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4353 } 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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|
4354 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4355 } else if (r->is_young()) { |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4356 type = "EDEN"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4357 } 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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|
4358 type = "HUMS"; |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4359 |
|
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|
4360 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
|
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4361 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
|
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|
4362 "they should have been zeroed after the last time we used them"); |
|
371bbc844bf1
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|
4363 // Set up the _hum_* fields. |
|
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|
4364 _hum_capacity_bytes = capacity_bytes; |
|
371bbc844bf1
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|
4365 _hum_used_bytes = used_bytes; |
|
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|
4366 _hum_prev_live_bytes = prev_live_bytes; |
|
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|
4367 _hum_next_live_bytes = next_live_bytes; |
|
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|
4368 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
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|
4369 &prev_live_bytes, &next_live_bytes); |
|
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|
4370 end = bottom + HeapRegion::GrainWords; |
|
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|
4371 } else if (r->continuesHumongous()) { |
|
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|
4372 type = "HUMC"; |
|
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|
4373 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
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|
4374 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
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|
4375 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
|
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|
4376 } else { |
|
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|
4377 type = "OLD"; |
|
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diff
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|
4378 } |
|
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changeset
|
4379 |
|
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|
4380 _total_used_bytes += used_bytes; |
|
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|
4381 _total_capacity_bytes += capacity_bytes; |
|
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|
4382 _total_prev_live_bytes += prev_live_bytes; |
|
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|
4383 _total_next_live_bytes += next_live_bytes; |
|
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|
4384 |
|
371bbc844bf1
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changeset
|
4385 // Print a line for this particular region. |
|
371bbc844bf1
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|
4386 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
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|
4387 G1PPRL_TYPE_FORMAT |
|
371bbc844bf1
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|
4388 G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
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|
4389 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4390 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
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|
4391 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
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|
4392 G1PPRL_DOUBLE_FORMAT, |
|
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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|
4393 type, bottom, end, |
|
371bbc844bf1
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changeset
|
4394 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
|
371bbc844bf1
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changeset
|
4395 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4396 return false; |
|
371bbc844bf1
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2369
diff
changeset
|
4397 } |
|
371bbc844bf1
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diff
changeset
|
4398 |
|
371bbc844bf1
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changeset
|
4399 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
371bbc844bf1
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changeset
|
4400 // Print the footer of the output. |
|
371bbc844bf1
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2369
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changeset
|
4401 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4402 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
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|
4403 " SUMMARY" |
|
371bbc844bf1
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changeset
|
4404 G1PPRL_SUM_MB_FORMAT("capacity") |
|
371bbc844bf1
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changeset
|
4405 G1PPRL_SUM_MB_PERC_FORMAT("used") |
|
371bbc844bf1
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|
4406 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
371bbc844bf1
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|
4407 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
|
371bbc844bf1
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changeset
|
4408 bytes_to_mb(_total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4409 bytes_to_mb(_total_used_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4410 perc(_total_used_bytes, _total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4411 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
|
4412 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
|
4413 bytes_to_mb(_total_next_live_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4414 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
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diff
changeset
|
4415 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4416 } |