Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | a2f7274eb6ef |
| children | 859cd1a76f8a |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/symbolTable.hpp" | |
| 3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
| 1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
| 29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1Log.hpp" |
| 3771 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 1972 | 34 #include "gc_implementation/g1/g1RemSet.hpp" |
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35 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 37 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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38 #include "gc_implementation/shared/vmGCOperations.hpp" |
| 1972 | 39 #include "memory/genOopClosures.inline.hpp" |
| 40 #include "memory/referencePolicy.hpp" | |
| 41 #include "memory/resourceArea.hpp" | |
| 42 #include "oops/oop.inline.hpp" | |
| 43 #include "runtime/handles.inline.hpp" | |
| 44 #include "runtime/java.hpp" | |
| 6197 | 45 #include "services/memTracker.hpp" |
| 342 | 46 |
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47 // Concurrent marking bit map wrapper |
| 342 | 48 |
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49 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
| 342 | 50 _bm((uintptr_t*)NULL,0), |
| 51 _shifter(shifter) { | |
| 52 _bmStartWord = (HeapWord*)(rs.base()); | |
| 53 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
| 54 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
| 55 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
| 56 | |
| 6197 | 57 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
| 58 | |
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59 guarantee(brs.is_reserved(), "couldn't allocate concurrent marking bit map"); |
| 342 | 60 // For now we'll just commit all of the bit map up fromt. |
| 61 // Later on we'll try to be more parsimonious with swap. | |
| 62 guarantee(_virtual_space.initialize(brs, brs.size()), | |
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63 "couldn't reseve backing store for concurrent marking bit map"); |
| 342 | 64 assert(_virtual_space.committed_size() == brs.size(), |
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65 "didn't reserve backing store for all of concurrent marking bit map?"); |
| 342 | 66 _bm.set_map((uintptr_t*)_virtual_space.low()); |
| 67 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
| 68 _bmWordSize, "inconsistency in bit map sizing"); | |
| 69 _bm.set_size(_bmWordSize >> _shifter); | |
| 70 } | |
| 71 | |
| 72 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
| 73 HeapWord* limit) const { | |
| 74 // First we must round addr *up* to a possible object boundary. | |
| 75 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
| 76 HeapWordSize << _shifter); | |
| 77 size_t addrOffset = heapWordToOffset(addr); | |
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78 if (limit == NULL) { |
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79 limit = _bmStartWord + _bmWordSize; |
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80 } |
| 342 | 81 size_t limitOffset = heapWordToOffset(limit); |
| 82 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
| 83 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 84 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 85 assert(nextAddr == limit || isMarked(nextAddr), | |
| 86 "get_next_one postcondition"); | |
| 87 return nextAddr; | |
| 88 } | |
| 89 | |
| 90 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
| 91 HeapWord* limit) const { | |
| 92 size_t addrOffset = heapWordToOffset(addr); | |
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93 if (limit == NULL) { |
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94 limit = _bmStartWord + _bmWordSize; |
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95 } |
| 342 | 96 size_t limitOffset = heapWordToOffset(limit); |
| 97 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
| 98 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 99 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 100 assert(nextAddr == limit || !isMarked(nextAddr), | |
| 101 "get_next_one postcondition"); | |
| 102 return nextAddr; | |
| 103 } | |
| 104 | |
| 105 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
| 106 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
| 107 return (int) (diff >> _shifter); | |
| 108 } | |
| 109 | |
| 110 #ifndef PRODUCT | |
| 111 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
| 112 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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113 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
| 342 | 114 "size inconsistency"); |
| 115 return _bmStartWord == (HeapWord*)(rs.base()) && | |
| 116 _bmWordSize == rs.size()>>LogHeapWordSize; | |
| 117 } | |
| 118 #endif | |
| 119 | |
| 120 void CMBitMap::clearAll() { | |
| 121 _bm.clear(); | |
| 122 return; | |
| 123 } | |
| 124 | |
| 125 void CMBitMap::markRange(MemRegion mr) { | |
| 126 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 127 assert(!mr.is_empty(), "unexpected empty region"); | |
| 128 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 129 ((HeapWord *) mr.end())), | |
| 130 "markRange memory region end is not card aligned"); | |
| 131 // convert address range into offset range | |
| 132 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 133 heapWordToOffset(mr.end()), true); | |
| 134 } | |
| 135 | |
| 136 void CMBitMap::clearRange(MemRegion mr) { | |
| 137 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 138 assert(!mr.is_empty(), "unexpected empty region"); | |
| 139 // convert address range into offset range | |
| 140 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 141 heapWordToOffset(mr.end()), false); | |
| 142 } | |
| 143 | |
| 144 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 145 HeapWord* end_addr) { | |
| 146 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 147 start = MIN2(start, end_addr); | |
| 148 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 149 end = MIN2(end, end_addr); | |
| 150 assert(start <= end, "Consistency check"); | |
| 151 MemRegion mr(start, end); | |
| 152 if (!mr.is_empty()) { | |
| 153 clearRange(mr); | |
| 154 } | |
| 155 return mr; | |
| 156 } | |
| 157 | |
| 158 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 159 _base(NULL), _cm(cm) | |
| 160 #ifdef ASSERT | |
| 161 , _drain_in_progress(false) | |
| 162 , _drain_in_progress_yields(false) | |
| 163 #endif | |
| 164 {} | |
| 165 | |
| 166 void CMMarkStack::allocate(size_t size) { | |
| 6197 | 167 _base = NEW_C_HEAP_ARRAY(oop, size, mtGC); |
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168 if (_base == NULL) { |
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169 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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170 } |
| 342 | 171 _index = 0; |
| 172 _capacity = (jint) size; | |
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173 _saved_index = -1; |
| 342 | 174 NOT_PRODUCT(_max_depth = 0); |
| 175 } | |
| 176 | |
| 177 CMMarkStack::~CMMarkStack() { | |
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178 if (_base != NULL) { |
| 6197 | 179 FREE_C_HEAP_ARRAY(oop, _base, mtGC); |
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180 } |
| 342 | 181 } |
| 182 | |
| 183 void CMMarkStack::par_push(oop ptr) { | |
| 184 while (true) { | |
| 185 if (isFull()) { | |
| 186 _overflow = true; | |
| 187 return; | |
| 188 } | |
| 189 // Otherwise... | |
| 190 jint index = _index; | |
| 191 jint next_index = index+1; | |
| 192 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 193 if (res == index) { | |
| 194 _base[index] = ptr; | |
| 195 // Note that we don't maintain this atomically. We could, but it | |
| 196 // doesn't seem necessary. | |
| 197 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 198 return; | |
| 199 } | |
| 200 // Otherwise, we need to try again. | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 205 while (true) { | |
| 206 if (isFull()) { | |
| 207 _overflow = true; | |
| 208 return; | |
| 209 } | |
| 210 // Otherwise... | |
| 211 jint index = _index; | |
| 212 jint next_index = index + n; | |
| 213 if (next_index > _capacity) { | |
| 214 _overflow = true; | |
| 215 return; | |
| 216 } | |
| 217 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 218 if (res == index) { | |
| 219 for (int i = 0; i < n; i++) { | |
| 220 int ind = index + i; | |
| 221 assert(ind < _capacity, "By overflow test above."); | |
| 222 _base[ind] = ptr_arr[i]; | |
| 223 } | |
| 224 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 225 return; | |
| 226 } | |
| 227 // Otherwise, we need to try again. | |
| 228 } | |
| 229 } | |
| 230 | |
| 231 | |
| 232 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 233 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 234 jint start = _index; | |
| 235 jint next_index = start + n; | |
| 236 if (next_index > _capacity) { | |
| 237 _overflow = true; | |
| 238 return; | |
| 239 } | |
| 240 // Otherwise. | |
| 241 _index = next_index; | |
| 242 for (int i = 0; i < n; i++) { | |
| 243 int ind = start + i; | |
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244 assert(ind < _capacity, "By overflow test above."); |
| 342 | 245 _base[ind] = ptr_arr[i]; |
| 246 } | |
| 247 } | |
| 248 | |
| 249 | |
| 250 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 251 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 252 jint index = _index; | |
| 253 if (index == 0) { | |
| 254 *n = 0; | |
| 255 return false; | |
| 256 } else { | |
| 257 int k = MIN2(max, index); | |
| 258 jint new_ind = index - k; | |
| 259 for (int j = 0; j < k; j++) { | |
| 260 ptr_arr[j] = _base[new_ind + j]; | |
| 261 } | |
| 262 _index = new_ind; | |
| 263 *n = k; | |
| 264 return true; | |
| 265 } | |
| 266 } | |
| 267 | |
| 268 template<class OopClosureClass> | |
| 269 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 270 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 271 || SafepointSynchronize::is_at_safepoint(), | |
| 272 "Drain recursion must be yield-safe."); | |
| 273 bool res = true; | |
| 274 debug_only(_drain_in_progress = true); | |
| 275 debug_only(_drain_in_progress_yields = yield_after); | |
| 276 while (!isEmpty()) { | |
| 277 oop newOop = pop(); | |
| 278 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 279 assert(newOop->is_oop(), "Expected an oop"); | |
| 280 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 281 "only grey objects on this stack"); | |
| 282 newOop->oop_iterate(cl); | |
| 283 if (yield_after && _cm->do_yield_check()) { | |
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284 res = false; |
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285 break; |
| 342 | 286 } |
| 287 } | |
| 288 debug_only(_drain_in_progress = false); | |
| 289 return res; | |
| 290 } | |
| 291 | |
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292 void CMMarkStack::note_start_of_gc() { |
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293 assert(_saved_index == -1, |
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294 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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295 _saved_index = _index; |
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296 } |
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297 |
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298 void CMMarkStack::note_end_of_gc() { |
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299 // This is intentionally a guarantee, instead of an assert. If we |
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300 // accidentally add something to the mark stack during GC, it |
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301 // will be a correctness issue so it's better if we crash. we'll |
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302 // only check this once per GC anyway, so it won't be a performance |
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303 // issue in any way. |
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304 guarantee(_saved_index == _index, |
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305 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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306 _saved_index = -1; |
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307 } |
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308 |
| 342 | 309 void CMMarkStack::oops_do(OopClosure* f) { |
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310 assert(_saved_index == _index, |
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311 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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312 for (int i = 0; i < _index; i += 1) { |
| 342 | 313 f->do_oop(&_base[i]); |
| 314 } | |
| 315 } | |
| 316 | |
| 317 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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318 return _g1h->is_obj_ill(obj); |
| 342 | 319 } |
| 320 | |
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321 CMRootRegions::CMRootRegions() : |
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322 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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323 _should_abort(false), _next_survivor(NULL) { } |
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324 |
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325 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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326 _young_list = g1h->young_list(); |
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327 _cm = cm; |
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328 } |
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329 |
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330 void CMRootRegions::prepare_for_scan() { |
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331 assert(!scan_in_progress(), "pre-condition"); |
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332 |
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333 // Currently, only survivors can be root regions. |
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334 assert(_next_survivor == NULL, "pre-condition"); |
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335 _next_survivor = _young_list->first_survivor_region(); |
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336 _scan_in_progress = (_next_survivor != NULL); |
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337 _should_abort = false; |
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338 } |
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339 |
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340 HeapRegion* CMRootRegions::claim_next() { |
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341 if (_should_abort) { |
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342 // If someone has set the should_abort flag, we return NULL to |
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343 // force the caller to bail out of their loop. |
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344 return NULL; |
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345 } |
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346 |
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347 // Currently, only survivors can be root regions. |
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348 HeapRegion* res = _next_survivor; |
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349 if (res != NULL) { |
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350 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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351 // Read it again in case it changed while we were waiting for the lock. |
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352 res = _next_survivor; |
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353 if (res != NULL) { |
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354 if (res == _young_list->last_survivor_region()) { |
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355 // We just claimed the last survivor so store NULL to indicate |
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356 // that we're done. |
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357 _next_survivor = NULL; |
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358 } else { |
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359 _next_survivor = res->get_next_young_region(); |
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360 } |
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361 } else { |
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362 // Someone else claimed the last survivor while we were trying |
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363 // to take the lock so nothing else to do. |
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364 } |
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365 } |
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366 assert(res == NULL || res->is_survivor(), "post-condition"); |
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367 |
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368 return res; |
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369 } |
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370 |
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371 void CMRootRegions::scan_finished() { |
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372 assert(scan_in_progress(), "pre-condition"); |
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373 |
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374 // Currently, only survivors can be root regions. |
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375 if (!_should_abort) { |
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376 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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377 } |
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378 _next_survivor = NULL; |
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379 |
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380 { |
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381 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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382 _scan_in_progress = false; |
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383 RootRegionScan_lock->notify_all(); |
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384 } |
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385 } |
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386 |
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387 bool CMRootRegions::wait_until_scan_finished() { |
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388 if (!scan_in_progress()) return false; |
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389 |
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390 { |
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391 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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392 while (scan_in_progress()) { |
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393 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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394 } |
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395 } |
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396 return true; |
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397 } |
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398 |
| 342 | 399 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 400 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 401 #endif // _MSC_VER | |
| 402 | |
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403 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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404 return MAX2((n_par_threads + 2) / 4, 1U); |
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405 } |
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406 |
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407 ConcurrentMark::ConcurrentMark(ReservedSpace rs, uint max_regions) : |
| 342 | 408 _markBitMap1(rs, MinObjAlignment - 1), |
| 409 _markBitMap2(rs, MinObjAlignment - 1), | |
| 410 | |
| 411 _parallel_marking_threads(0), | |
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412 _max_parallel_marking_threads(0), |
| 342 | 413 _sleep_factor(0.0), |
| 414 _marking_task_overhead(1.0), | |
| 415 _cleanup_sleep_factor(0.0), | |
| 416 _cleanup_task_overhead(1.0), | |
| 2152 | 417 _cleanup_list("Cleanup List"), |
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418 _region_bm((BitMap::idx_t) max_regions, false /* in_resource_area*/), |
| 342 | 419 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> |
| 420 CardTableModRefBS::card_shift, | |
| 421 false /* in_resource_area*/), | |
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422 |
| 342 | 423 _prevMarkBitMap(&_markBitMap1), |
| 424 _nextMarkBitMap(&_markBitMap2), | |
| 425 | |
| 426 _markStack(this), | |
| 427 // _finger set in set_non_marking_state | |
| 428 | |
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429 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 430 // _active_tasks set in set_non_marking_state |
| 431 // _tasks set inside the constructor | |
| 432 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
| 433 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
| 434 | |
| 435 _has_overflown(false), | |
| 436 _concurrent(false), | |
|
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437 _has_aborted(false), |
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438 _restart_for_overflow(false), |
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439 _concurrent_marking_in_progress(false), |
| 342 | 440 |
| 441 // _verbose_level set below | |
| 442 | |
| 443 _init_times(), | |
| 444 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 445 _cleanup_times(), | |
| 446 _total_counting_time(0.0), | |
| 447 _total_rs_scrub_time(0.0), | |
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448 |
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449 _parallel_workers(NULL), |
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450 |
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451 _count_card_bitmaps(NULL), |
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452 _count_marked_bytes(NULL) { |
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453 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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454 if (verbose_level < no_verbose) { |
| 342 | 455 verbose_level = no_verbose; |
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456 } |
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457 if (verbose_level > high_verbose) { |
| 342 | 458 verbose_level = high_verbose; |
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459 } |
| 342 | 460 _verbose_level = verbose_level; |
| 461 | |
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462 if (verbose_low()) { |
| 342 | 463 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
| 464 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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465 } |
| 342 | 466 |
| 1284 | 467 _markStack.allocate(MarkStackSize); |
| 342 | 468 |
| 469 // Create & start a ConcurrentMark thread. | |
|
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470 _cmThread = new ConcurrentMarkThread(this); |
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471 assert(cmThread() != NULL, "CM Thread should have been created"); |
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472 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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473 |
| 342 | 474 _g1h = G1CollectedHeap::heap(); |
| 475 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
| 476 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
| 477 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
| 478 | |
| 479 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 480 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 481 |
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482 _root_regions.init(_g1h, this); |
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483 |
| 6197 | 484 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num, mtGC); |
| 485 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num, mtGC); | |
| 486 | |
| 487 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_task_num, mtGC); | |
| 488 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_task_num, mtGC); | |
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489 |
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490 BitMap::idx_t card_bm_size = _card_bm.size(); |
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491 |
| 342 | 492 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
| 493 _active_tasks = _max_task_num; | |
| 494 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 495 CMTaskQueue* task_queue = new CMTaskQueue(); | |
| 496 task_queue->initialize(); | |
| 497 _task_queues->register_queue(i, task_queue); | |
| 498 | |
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499 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
| 6197 | 500 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, (size_t) max_regions, mtGC); |
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501 |
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502 _tasks[i] = new CMTask(i, this, |
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503 _count_marked_bytes[i], |
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504 &_count_card_bitmaps[i], |
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505 task_queue, _task_queues); |
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506 |
| 342 | 507 _accum_task_vtime[i] = 0.0; |
| 508 } | |
| 509 | |
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510 // Calculate the card number for the bottom of the heap. Used |
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511 // in biasing indexes into the accounting card bitmaps. |
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512 _heap_bottom_card_num = |
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513 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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514 CardTableModRefBS::card_shift); |
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515 |
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516 // Clear all the liveness counting data |
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517 clear_all_count_data(); |
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518 |
| 1284 | 519 if (ConcGCThreads > ParallelGCThreads) { |
| 520 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
| 342 | 521 "than ParallelGCThreads."); |
| 522 } | |
| 523 if (ParallelGCThreads == 0) { | |
| 524 // if we are not running with any parallel GC threads we will not | |
| 525 // spawn any marking threads either | |
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526 _parallel_marking_threads = 0; |
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527 _max_parallel_marking_threads = 0; |
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528 _sleep_factor = 0.0; |
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529 _marking_task_overhead = 1.0; |
| 342 | 530 } else { |
| 1284 | 531 if (ConcGCThreads > 0) { |
| 532 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
| 342 | 533 // if both are set |
| 534 | |
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535 _parallel_marking_threads = (uint) ConcGCThreads; |
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536 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 537 _sleep_factor = 0.0; |
| 538 _marking_task_overhead = 1.0; | |
| 751 | 539 } else if (G1MarkingOverheadPercent > 0) { |
| 342 | 540 // we will calculate the number of parallel marking threads |
| 541 // based on a target overhead with respect to the soft real-time | |
| 542 // goal | |
| 543 | |
| 751 | 544 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 545 double overall_cm_overhead = |
| 751 | 546 (double) MaxGCPauseMillis * marking_overhead / |
| 547 (double) GCPauseIntervalMillis; | |
| 342 | 548 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 549 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 550 double marking_task_overhead = | |
| 551 overall_cm_overhead / marking_thread_num * | |
| 552 (double) os::processor_count(); | |
| 553 double sleep_factor = | |
| 554 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 555 | |
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556 _parallel_marking_threads = (uint) marking_thread_num; |
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557 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 558 _sleep_factor = sleep_factor; |
| 559 _marking_task_overhead = marking_task_overhead; | |
| 560 } else { | |
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561 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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562 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 563 _sleep_factor = 0.0; |
| 564 _marking_task_overhead = 1.0; | |
| 565 } | |
| 566 | |
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567 if (parallel_marking_threads() > 1) { |
| 342 | 568 _cleanup_task_overhead = 1.0; |
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569 } else { |
| 342 | 570 _cleanup_task_overhead = marking_task_overhead(); |
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571 } |
| 342 | 572 _cleanup_sleep_factor = |
| 573 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 574 | |
| 575 #if 0 | |
| 576 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 577 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 578 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 579 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 580 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 581 #endif | |
| 582 | |
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583 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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584 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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585 _max_parallel_marking_threads, false, true); |
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586 if (_parallel_workers == NULL) { |
| 342 | 587 vm_exit_during_initialization("Failed necessary allocation."); |
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588 } else { |
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589 _parallel_workers->initialize_workers(); |
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590 } |
| 342 | 591 } |
| 592 | |
| 593 // so that the call below can read a sensible value | |
| 594 _heap_start = (HeapWord*) rs.base(); | |
| 595 set_non_marking_state(); | |
| 596 } | |
| 597 | |
| 598 void ConcurrentMark::update_g1_committed(bool force) { | |
| 599 // If concurrent marking is not in progress, then we do not need to | |
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600 // update _heap_end. |
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601 if (!concurrent_marking_in_progress() && !force) return; |
| 342 | 602 |
| 603 MemRegion committed = _g1h->g1_committed(); | |
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604 assert(committed.start() == _heap_start, "start shouldn't change"); |
| 342 | 605 HeapWord* new_end = committed.end(); |
| 606 if (new_end > _heap_end) { | |
| 607 // The heap has been expanded. | |
| 608 | |
| 609 _heap_end = new_end; | |
| 610 } | |
| 611 // Notice that the heap can also shrink. However, this only happens | |
| 612 // during a Full GC (at least currently) and the entire marking | |
| 613 // phase will bail out and the task will not be restarted. So, let's | |
| 614 // do nothing. | |
| 615 } | |
| 616 | |
| 617 void ConcurrentMark::reset() { | |
| 618 // Starting values for these two. This should be called in a STW | |
| 619 // phase. CM will be notified of any future g1_committed expansions | |
| 620 // will be at the end of evacuation pauses, when tasks are | |
| 621 // inactive. | |
| 622 MemRegion committed = _g1h->g1_committed(); | |
| 623 _heap_start = committed.start(); | |
| 624 _heap_end = committed.end(); | |
| 625 | |
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626 // Separated the asserts so that we know which one fires. |
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627 assert(_heap_start != NULL, "heap bounds should look ok"); |
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628 assert(_heap_end != NULL, "heap bounds should look ok"); |
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629 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 630 |
| 631 // reset all the marking data structures and any necessary flags | |
| 632 clear_marking_state(); | |
| 633 | |
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634 if (verbose_low()) { |
| 342 | 635 gclog_or_tty->print_cr("[global] resetting"); |
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636 } |
| 342 | 637 |
| 638 // We do reset all of them, since different phases will use | |
| 639 // different number of active threads. So, it's easiest to have all | |
| 640 // of them ready. | |
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641 for (int i = 0; i < (int) _max_task_num; ++i) { |
| 342 | 642 _tasks[i]->reset(_nextMarkBitMap); |
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643 } |
| 342 | 644 |
| 645 // we need this to make sure that the flag is on during the evac | |
| 646 // pause with initial mark piggy-backed | |
| 647 set_concurrent_marking_in_progress(); | |
| 648 } | |
| 649 | |
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650 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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651 assert(active_tasks <= _max_task_num, "we should not have more"); |
| 342 | 652 |
| 653 _active_tasks = active_tasks; | |
| 654 // Need to update the three data structures below according to the | |
| 655 // number of active threads for this phase. | |
| 656 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 657 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 658 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 659 | |
| 660 _concurrent = concurrent; | |
| 661 // We propagate this to all tasks, not just the active ones. | |
| 662 for (int i = 0; i < (int) _max_task_num; ++i) | |
| 663 _tasks[i]->set_concurrent(concurrent); | |
| 664 | |
| 665 if (concurrent) { | |
| 666 set_concurrent_marking_in_progress(); | |
| 667 } else { | |
| 668 // We currently assume that the concurrent flag has been set to | |
| 669 // false before we start remark. At this point we should also be | |
| 670 // in a STW phase. | |
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671 assert(!concurrent_marking_in_progress(), "invariant"); |
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672 assert(_finger == _heap_end, "only way to get here"); |
| 342 | 673 update_g1_committed(true); |
| 674 } | |
| 675 } | |
| 676 | |
| 677 void ConcurrentMark::set_non_marking_state() { | |
| 678 // We set the global marking state to some default values when we're | |
| 679 // not doing marking. | |
| 680 clear_marking_state(); | |
| 681 _active_tasks = 0; | |
| 682 clear_concurrent_marking_in_progress(); | |
| 683 } | |
| 684 | |
| 685 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 686 // The ConcurrentMark instance is never freed. |
| 687 ShouldNotReachHere(); | |
| 342 | 688 } |
| 689 | |
| 690 void ConcurrentMark::clearNextBitmap() { | |
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691 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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692 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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693 |
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694 // Make sure that the concurrent mark thread looks to still be in |
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695 // the current cycle. |
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696 guarantee(cmThread()->during_cycle(), "invariant"); |
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697 |
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698 // We are finishing up the current cycle by clearing the next |
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699 // marking bitmap and getting it ready for the next cycle. During |
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700 // this time no other cycle can start. So, let's make sure that this |
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701 // is the case. |
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702 guarantee(!g1h->mark_in_progress(), "invariant"); |
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703 |
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704 // clear the mark bitmap (no grey objects to start with). |
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705 // We need to do this in chunks and offer to yield in between |
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706 // each chunk. |
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707 HeapWord* start = _nextMarkBitMap->startWord(); |
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708 HeapWord* end = _nextMarkBitMap->endWord(); |
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709 HeapWord* cur = start; |
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710 size_t chunkSize = M; |
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711 while (cur < end) { |
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712 HeapWord* next = cur + chunkSize; |
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713 if (next > end) { |
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714 next = end; |
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715 } |
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716 MemRegion mr(cur,next); |
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717 _nextMarkBitMap->clearRange(mr); |
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718 cur = next; |
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719 do_yield_check(); |
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720 |
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721 // Repeat the asserts from above. We'll do them as asserts here to |
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722 // minimize their overhead on the product. However, we'll have |
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723 // them as guarantees at the beginning / end of the bitmap |
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724 // clearing to get some checking in the product. |
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725 assert(cmThread()->during_cycle(), "invariant"); |
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726 assert(!g1h->mark_in_progress(), "invariant"); |
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727 } |
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728 |
|
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729 // Clear the liveness counting data |
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730 clear_all_count_data(); |
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731 |
|
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732 // Repeat the asserts from above. |
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733 guarantee(cmThread()->during_cycle(), "invariant"); |
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734 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 735 } |
| 736 | |
| 737 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
| 738 public: | |
| 739 bool doHeapRegion(HeapRegion* r) { | |
| 740 if (!r->continuesHumongous()) { | |
|
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741 r->note_start_of_marking(); |
| 342 | 742 } |
| 743 return false; | |
| 744 } | |
| 745 }; | |
| 746 | |
| 747 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 748 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 749 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 750 | |
| 751 _has_aborted = false; | |
| 752 | |
|
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753 #ifndef PRODUCT |
| 1044 | 754 if (G1PrintReachableAtInitialMark) { |
| 1388 | 755 print_reachable("at-cycle-start", |
|
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756 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 757 } |
|
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758 #endif |
| 342 | 759 |
| 760 // Initialise marking structures. This has to be done in a STW phase. | |
| 761 reset(); | |
|
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762 |
|
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763 // For each region note start of marking. |
|
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764 NoteStartOfMarkHRClosure startcl; |
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765 g1h->heap_region_iterate(&startcl); |
| 342 | 766 } |
| 767 | |
| 768 | |
| 769 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 770 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 771 | |
|
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772 // If we force an overflow during remark, the remark operation will |
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773 // actually abort and we'll restart concurrent marking. If we always |
|
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774 // force an oveflow during remark we'll never actually complete the |
|
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775 // marking phase. So, we initilize this here, at the start of the |
|
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776 // cycle, so that at the remaining overflow number will decrease at |
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777 // every remark and we'll eventually not need to cause one. |
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778 force_overflow_stw()->init(); |
|
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779 |
|
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780 // Start Concurrent Marking weak-reference discovery. |
|
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781 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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782 // enable ("weak") refs discovery |
|
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783 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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784 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 785 |
| 786 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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787 // This is the start of the marking cycle, we're expected all |
|
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788 // threads to have SATB queues with active set to false. |
|
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789 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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790 false /* expected_active */); |
| 342 | 791 |
|
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792 _root_regions.prepare_for_scan(); |
|
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793 |
| 342 | 794 // update_g1_committed() will be called at the end of an evac pause |
| 795 // when marking is on. So, it's also called at the end of the | |
| 796 // initial-mark pause to update the heap end, if the heap expands | |
| 797 // during it. No need to call it here. | |
| 798 } | |
| 799 | |
| 800 /* | |
|
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801 * Notice that in the next two methods, we actually leave the STS |
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802 * during the barrier sync and join it immediately afterwards. If we |
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803 * do not do this, the following deadlock can occur: one thread could |
|
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804 * be in the barrier sync code, waiting for the other thread to also |
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805 * sync up, whereas another one could be trying to yield, while also |
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806 * waiting for the other threads to sync up too. |
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807 * |
|
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808 * Note, however, that this code is also used during remark and in |
|
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809 * this case we should not attempt to leave / enter the STS, otherwise |
|
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810 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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811 * (product). So we should only leave / enter the STS if we are |
|
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812 * operating concurrently. |
|
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813 * |
|
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814 * Because the thread that does the sync barrier has left the STS, it |
|
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815 * is possible to be suspended for a Full GC or an evacuation pause |
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816 * could occur. This is actually safe, since the entering the sync |
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817 * barrier is one of the last things do_marking_step() does, and it |
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818 * doesn't manipulate any data structures afterwards. |
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819 */ |
| 342 | 820 |
| 821 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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822 if (verbose_low()) { |
| 342 | 823 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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824 } |
| 342 | 825 |
|
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826 if (concurrent()) { |
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827 ConcurrentGCThread::stsLeave(); |
|
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828 } |
| 342 | 829 _first_overflow_barrier_sync.enter(); |
|
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830 if (concurrent()) { |
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831 ConcurrentGCThread::stsJoin(); |
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832 } |
| 342 | 833 // at this point everyone should have synced up and not be doing any |
| 834 // more work | |
| 835 | |
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836 if (verbose_low()) { |
| 342 | 837 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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838 } |
| 342 | 839 |
| 840 // let task 0 do this | |
| 841 if (task_num == 0) { | |
| 842 // task 0 is responsible for clearing the global data structures | |
|
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843 // We should be here because of an overflow. During STW we should |
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844 // not clear the overflow flag since we rely on it being true when |
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845 // we exit this method to abort the pause and restart concurent |
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846 // marking. |
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847 clear_marking_state(concurrent() /* clear_overflow */); |
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848 force_overflow()->update(); |
| 342 | 849 |
|
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850 if (G1Log::fine()) { |
| 342 | 851 gclog_or_tty->date_stamp(PrintGCDateStamps); |
| 852 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 853 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
| 854 } | |
| 855 } | |
| 856 | |
| 857 // after this, each task should reset its own data structures then | |
| 858 // then go into the second barrier | |
| 859 } | |
| 860 | |
| 861 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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862 if (verbose_low()) { |
| 342 | 863 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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864 } |
| 342 | 865 |
|
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866 if (concurrent()) { |
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867 ConcurrentGCThread::stsLeave(); |
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868 } |
| 342 | 869 _second_overflow_barrier_sync.enter(); |
|
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870 if (concurrent()) { |
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871 ConcurrentGCThread::stsJoin(); |
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872 } |
| 342 | 873 // at this point everything should be re-initialised and ready to go |
| 874 | |
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875 if (verbose_low()) { |
| 342 | 876 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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877 } |
| 342 | 878 } |
| 879 | |
|
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880 #ifndef PRODUCT |
|
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881 void ForceOverflowSettings::init() { |
|
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882 _num_remaining = G1ConcMarkForceOverflow; |
|
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883 _force = false; |
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884 update(); |
|
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885 } |
|
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886 |
|
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887 void ForceOverflowSettings::update() { |
|
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888 if (_num_remaining > 0) { |
|
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889 _num_remaining -= 1; |
|
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890 _force = true; |
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891 } else { |
|
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892 _force = false; |
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893 } |
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894 } |
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895 |
|
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896 bool ForceOverflowSettings::should_force() { |
|
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897 if (_force) { |
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898 _force = false; |
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899 return true; |
|
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900 } else { |
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901 return false; |
|
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902 } |
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903 } |
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904 #endif // !PRODUCT |
|
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905 |
| 342 | 906 class CMConcurrentMarkingTask: public AbstractGangTask { |
| 907 private: | |
| 908 ConcurrentMark* _cm; | |
| 909 ConcurrentMarkThread* _cmt; | |
| 910 | |
| 911 public: | |
|
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912 void work(uint worker_id) { |
|
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913 assert(Thread::current()->is_ConcurrentGC_thread(), |
|
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914 "this should only be done by a conc GC thread"); |
|
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915 ResourceMark rm; |
| 342 | 916 |
| 917 double start_vtime = os::elapsedVTime(); | |
| 918 | |
| 919 ConcurrentGCThread::stsJoin(); | |
| 920 | |
|
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921 assert(worker_id < _cm->active_tasks(), "invariant"); |
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922 CMTask* the_task = _cm->task(worker_id); |
| 342 | 923 the_task->record_start_time(); |
| 924 if (!_cm->has_aborted()) { | |
| 925 do { | |
| 926 double start_vtime_sec = os::elapsedVTime(); | |
| 927 double start_time_sec = os::elapsedTime(); | |
|
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928 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
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929 |
|
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930 the_task->do_marking_step(mark_step_duration_ms, |
|
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931 true /* do_stealing */, |
|
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932 true /* do_termination */); |
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933 |
| 342 | 934 double end_time_sec = os::elapsedTime(); |
| 935 double end_vtime_sec = os::elapsedVTime(); | |
| 936 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 937 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 938 _cm->clear_has_overflown(); | |
| 939 | |
|
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940 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 941 |
| 942 jlong sleep_time_ms; | |
| 943 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 944 sleep_time_ms = | |
| 945 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 946 ConcurrentGCThread::stsLeave(); | |
| 947 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 948 ConcurrentGCThread::stsJoin(); | |
| 949 } | |
| 950 double end_time2_sec = os::elapsedTime(); | |
| 951 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 952 | |
| 953 #if 0 | |
| 954 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 955 "overhead %1.4lf", | |
| 956 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 957 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 958 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 959 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 960 #endif | |
| 961 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 962 } | |
| 963 the_task->record_end_time(); | |
|
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964 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 965 |
| 966 ConcurrentGCThread::stsLeave(); | |
| 967 | |
| 968 double end_vtime = os::elapsedVTime(); | |
|
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969 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 970 } |
| 971 | |
| 972 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 973 ConcurrentMarkThread* cmt) : | |
| 974 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 975 | |
| 976 ~CMConcurrentMarkingTask() { } | |
| 977 }; | |
| 978 | |
|
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979 // Calculates the number of active workers for a concurrent |
|
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980 // phase. |
|
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981 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 982 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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983 uint n_conc_workers = 0; |
|
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984 if (!UseDynamicNumberOfGCThreads || |
|
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985 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
|
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986 !ForceDynamicNumberOfGCThreads)) { |
|
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987 n_conc_workers = max_parallel_marking_threads(); |
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988 } else { |
|
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989 n_conc_workers = |
|
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990 AdaptiveSizePolicy::calc_default_active_workers( |
|
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991 max_parallel_marking_threads(), |
|
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992 1, /* Minimum workers */ |
|
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993 parallel_marking_threads(), |
|
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994 Threads::number_of_non_daemon_threads()); |
|
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995 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
|
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996 // that scaling has already gone into "_max_parallel_marking_threads". |
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997 } |
| 4711 | 998 assert(n_conc_workers > 0, "Always need at least 1"); |
| 999 return n_conc_workers; | |
|
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1000 } |
| 4711 | 1001 // If we are not running with any parallel GC threads we will not |
| 1002 // have spawned any marking threads either. Hence the number of | |
| 1003 // concurrent workers should be 0. | |
| 1004 return 0; | |
|
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1005 } |
|
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1006 |
|
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1007 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
|
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1008 // Currently, only survivors can be root regions. |
|
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1009 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
|
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1010 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
|
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1011 |
|
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1012 const uintx interval = PrefetchScanIntervalInBytes; |
|
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1013 HeapWord* curr = hr->bottom(); |
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1014 const HeapWord* end = hr->top(); |
|
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1015 while (curr < end) { |
|
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1016 Prefetch::read(curr, interval); |
|
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1017 oop obj = oop(curr); |
|
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1018 int size = obj->oop_iterate(&cl); |
|
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1019 assert(size == obj->size(), "sanity"); |
|
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1020 curr += size; |
|
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1021 } |
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1022 } |
|
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1023 |
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1024 class CMRootRegionScanTask : public AbstractGangTask { |
|
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1025 private: |
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1026 ConcurrentMark* _cm; |
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1027 |
|
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1028 public: |
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1029 CMRootRegionScanTask(ConcurrentMark* cm) : |
|
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1030 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1031 |
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1032 void work(uint worker_id) { |
|
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1033 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1034 "this should only be done by a conc GC thread"); |
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1035 |
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1036 CMRootRegions* root_regions = _cm->root_regions(); |
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1037 HeapRegion* hr = root_regions->claim_next(); |
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1038 while (hr != NULL) { |
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1039 _cm->scanRootRegion(hr, worker_id); |
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1040 hr = root_regions->claim_next(); |
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1041 } |
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1042 } |
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1043 }; |
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1044 |
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1045 void ConcurrentMark::scanRootRegions() { |
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1046 // scan_in_progress() will have been set to true only if there was |
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1047 // at least one root region to scan. So, if it's false, we |
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1048 // should not attempt to do any further work. |
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1049 if (root_regions()->scan_in_progress()) { |
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1050 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1051 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1052 "Maximum number of marking threads exceeded"); |
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1053 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1054 |
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1055 CMRootRegionScanTask task(this); |
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1056 if (parallel_marking_threads() > 0) { |
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1057 _parallel_workers->set_active_workers((int) active_workers); |
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1058 _parallel_workers->run_task(&task); |
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1059 } else { |
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1060 task.work(0); |
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1061 } |
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1062 |
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1063 // It's possible that has_aborted() is true here without actually |
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1064 // aborting the survivor scan earlier. This is OK as it's |
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1065 // mainly used for sanity checking. |
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1066 root_regions()->scan_finished(); |
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1067 } |
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1068 } |
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1069 |
| 342 | 1070 void ConcurrentMark::markFromRoots() { |
| 1071 // we might be tempted to assert that: | |
| 1072 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1073 // "inconsistent argument?"); | |
| 1074 // However that wouldn't be right, because it's possible that | |
| 1075 // a safepoint is indeed in progress as a younger generation | |
| 1076 // stop-the-world GC happens even as we mark in this generation. | |
| 1077 | |
| 1078 _restart_for_overflow = false; | |
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1079 force_overflow_conc()->init(); |
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1080 |
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1081 // _g1h has _n_par_threads |
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1082 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1083 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1084 "Maximum number of marking threads exceeded"); |
| 4711 | 1085 |
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1086 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1087 |
| 1088 // Parallel task terminator is set in "set_phase()" | |
| 1089 set_phase(active_workers, true /* concurrent */); | |
| 342 | 1090 |
| 1091 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1092 if (parallel_marking_threads() > 0) { |
| 4711 | 1093 _parallel_workers->set_active_workers((int)active_workers); |
| 1094 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
| 1095 // and the decisions on that MT processing is made elsewhere. | |
| 1096 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1097 _parallel_workers->run_task(&markingTask); |
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1098 } else { |
| 342 | 1099 markingTask.work(0); |
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1100 } |
| 342 | 1101 print_stats(); |
| 1102 } | |
| 1103 | |
| 1104 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1105 // world is stopped at this checkpoint | |
| 1106 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1107 "world should be stopped"); | |
|
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1108 |
| 342 | 1109 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1110 | |
| 1111 // If a full collection has happened, we shouldn't do this. | |
| 1112 if (has_aborted()) { | |
| 1113 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1114 return; | |
| 1115 } | |
| 1116 | |
|
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1117 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1118 |
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1119 if (VerifyDuringGC) { |
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1120 HandleMark hm; // handle scope |
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1121 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1122 Universe::heap()->prepare_for_verify(); |
| 6008 | 1123 Universe::verify(/* silent */ false, |
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1124 /* option */ VerifyOption_G1UsePrevMarking); |
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1125 } |
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1126 |
| 342 | 1127 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1128 g1p->record_concurrent_mark_remark_start(); | |
| 1129 | |
| 1130 double start = os::elapsedTime(); | |
| 1131 | |
| 1132 checkpointRootsFinalWork(); | |
| 1133 | |
| 1134 double mark_work_end = os::elapsedTime(); | |
| 1135 | |
| 1136 weakRefsWork(clear_all_soft_refs); | |
| 1137 | |
| 1138 if (has_overflown()) { | |
| 1139 // Oops. We overflowed. Restart concurrent marking. | |
| 1140 _restart_for_overflow = true; | |
| 1141 // Clear the flag. We do not need it any more. | |
| 1142 clear_has_overflown(); | |
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1143 if (G1TraceMarkStackOverflow) { |
| 342 | 1144 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1145 } |
| 342 | 1146 } else { |
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1147 // Aggregate the per-task counting data that we have accumulated |
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1148 // while marking. |
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1149 aggregate_count_data(); |
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1150 |
| 2149 | 1151 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1152 // We're done with marking. |
|
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1153 // This is the end of the marking cycle, we're expected all |
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1154 // threads to have SATB queues with active set to true. |
| 2149 | 1155 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1156 true /* expected_active */); | |
| 811 | 1157 |
| 1158 if (VerifyDuringGC) { | |
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1159 HandleMark hm; // handle scope |
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1160 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1161 Universe::heap()->prepare_for_verify(); |
| 6008 | 1162 Universe::verify(/* silent */ false, |
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1163 /* option */ VerifyOption_G1UseNextMarking); |
| 811 | 1164 } |
|
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1165 assert(!restart_for_overflow(), "sanity"); |
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1166 } |
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1167 |
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1168 // Reset the marking state if marking completed |
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1169 if (!restart_for_overflow()) { |
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1170 set_non_marking_state(); |
| 342 | 1171 } |
| 1172 | |
| 1173 #if VERIFY_OBJS_PROCESSED | |
| 1174 _scan_obj_cl.objs_processed = 0; | |
| 1175 ThreadLocalObjQueue::objs_enqueued = 0; | |
| 1176 #endif | |
| 1177 | |
| 1178 // Statistics | |
| 1179 double now = os::elapsedTime(); | |
| 1180 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1181 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1182 _remark_times.add((now - start) * 1000.0); | |
| 1183 | |
| 1184 g1p->record_concurrent_mark_remark_end(); | |
| 1185 } | |
| 1186 | |
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1187 // Base class of the closures that finalize and verify the |
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1188 // liveness counting data. |
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1189 class CMCountDataClosureBase: public HeapRegionClosure { |
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1190 protected: |
| 342 | 1191 ConcurrentMark* _cm; |
| 1192 BitMap* _region_bm; | |
| 1193 BitMap* _card_bm; | |
|
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1194 |
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1195 void set_card_bitmap_range(BitMap::idx_t start_idx, BitMap::idx_t last_idx) { |
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1196 assert(start_idx <= last_idx, "sanity"); |
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1197 |
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1198 // Set the inclusive bit range [start_idx, last_idx]. |
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1199 // For small ranges (up to 8 cards) use a simple loop; otherwise |
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1200 // use par_at_put_range. |
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1201 if ((last_idx - start_idx) < 8) { |
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1202 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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1203 _card_bm->par_set_bit(i); |
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1204 } |
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1205 } else { |
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1206 assert(last_idx < _card_bm->size(), "sanity"); |
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1207 // Note BitMap::par_at_put_range() is exclusive. |
|
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1208 BitMap::idx_t max_idx = MAX2(last_idx+1, _card_bm->size()); |
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1209 _card_bm->par_at_put_range(start_idx, max_idx, true); |
| 342 | 1210 } |
| 1211 } | |
| 1212 | |
| 829 | 1213 // It takes a region that's not empty (i.e., it has at least one |
| 1214 // live object in it and sets its corresponding bit on the region | |
| 1215 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1216 // to 1 the bits on the region bitmap that correspond to its | |
| 1217 // associated "continues humongous" regions. | |
| 1218 void set_bit_for_region(HeapRegion* hr) { | |
| 1219 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1220 | |
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1221 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
| 829 | 1222 if (!hr->startsHumongous()) { |
| 1223 // Normal (non-humongous) case: just set the bit. | |
|
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1224 _region_bm->par_at_put(index, true); |
| 829 | 1225 } else { |
| 1226 // Starts humongous case: calculate how many regions are part of | |
|
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1227 // this humongous region and then set the bit range. |
|
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1228 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
|
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1229 _region_bm->par_at_put_range(index, end_index, true); |
| 829 | 1230 } |
| 1231 } | |
| 1232 | |
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1233 public: |
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1234 CMCountDataClosureBase(ConcurrentMark *cm, |
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1235 BitMap* region_bm, BitMap* card_bm): |
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1236 _cm(cm), _region_bm(region_bm), _card_bm(card_bm) { } |
|
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1237 }; |
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1238 |
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1239 // Closure that calculates the # live objects per region. Used |
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1240 // for verification purposes during the cleanup pause. |
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1241 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1242 CMBitMapRO* _bm; |
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1243 size_t _region_marked_bytes; |
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1244 |
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1245 public: |
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1246 CalcLiveObjectsClosure(CMBitMapRO *bm, ConcurrentMark *cm, |
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1247 BitMap* region_bm, BitMap* card_bm) : |
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1248 CMCountDataClosureBase(cm, region_bm, card_bm), |
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1249 _bm(bm), _region_marked_bytes(0) { } |
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1250 |
| 342 | 1251 bool doHeapRegion(HeapRegion* hr) { |
| 1252 | |
| 639 | 1253 if (hr->continuesHumongous()) { |
| 829 | 1254 // We will ignore these here and process them when their |
| 1255 // associated "starts humongous" region is processed (see | |
| 1256 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1257 // associated "starts humongous" region to have their bit set to | |
| 1258 // 1 since, due to the region chunking in the parallel region | |
| 1259 // iteration, a "continues humongous" region might be visited | |
| 1260 // before its associated "starts humongous". | |
| 639 | 1261 return false; |
| 1262 } | |
| 342 | 1263 |
| 1264 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
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1265 HeapWord* start = hr->bottom(); |
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1266 |
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1267 assert(start <= hr->end() && start <= nextTop && nextTop <= hr->end(), |
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1268 err_msg("Preconditions not met - " |
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1269 "start: "PTR_FORMAT", nextTop: "PTR_FORMAT", end: "PTR_FORMAT, |
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1270 start, nextTop, hr->end())); |
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1271 |
| 342 | 1272 // Find the first marked object at or after "start". |
| 1273 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
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1274 |
| 342 | 1275 size_t marked_bytes = 0; |
| 1276 | |
| 1277 while (start < nextTop) { | |
| 1278 oop obj = oop(start); | |
| 1279 int obj_sz = obj->size(); | |
| 1280 HeapWord* obj_last = start + obj_sz - 1; | |
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1281 |
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1282 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1283 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(obj_last); |
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1284 |
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1285 // Set the bits in the card BM for this object (inclusive). |
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1286 set_card_bitmap_range(start_idx, last_idx); |
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1287 |
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1288 // Add the size of this object to the number of marked bytes. |
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1289 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1290 |
| 342 | 1291 // Find the next marked object after this one. |
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1292 start = _bm->getNextMarkedWordAddress(obj_last + 1, nextTop); |
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1293 } |
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1294 |
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1295 // Mark the allocated-since-marking portion... |
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1296 HeapWord* top = hr->top(); |
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1297 if (nextTop < top) { |
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1298 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(nextTop); |
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1299 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top - 1); |
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1300 |
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1301 set_card_bitmap_range(start_idx, last_idx); |
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1302 |
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1303 // This definitely means the region has live objects. |
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1304 set_bit_for_region(hr); |
| 342 | 1305 } |
| 1306 | |
| 1307 // Update the live region bitmap. | |
| 1308 if (marked_bytes > 0) { | |
| 829 | 1309 set_bit_for_region(hr); |
| 342 | 1310 } |
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1311 |
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1312 // Set the marked bytes for the current region so that |
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1313 // it can be queried by a calling verificiation routine |
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1314 _region_marked_bytes = marked_bytes; |
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1315 |
| 342 | 1316 return false; |
| 1317 } | |
| 1318 | |
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1319 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1320 }; |
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1321 |
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1322 // Heap region closure used for verifying the counting data |
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1323 // that was accumulated concurrently and aggregated during |
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1324 // the remark pause. This closure is applied to the heap |
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1325 // regions during the STW cleanup pause. |
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1326 |
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1327 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1328 ConcurrentMark* _cm; |
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1329 CalcLiveObjectsClosure _calc_cl; |
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1330 BitMap* _region_bm; // Region BM to be verified |
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1331 BitMap* _card_bm; // Card BM to be verified |
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1332 bool _verbose; // verbose output? |
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1333 |
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1334 BitMap* _exp_region_bm; // Expected Region BM values |
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1335 BitMap* _exp_card_bm; // Expected card BM values |
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1336 |
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1337 int _failures; |
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1338 |
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1339 public: |
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1340 VerifyLiveObjectDataHRClosure(ConcurrentMark* cm, |
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1341 BitMap* region_bm, |
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1342 BitMap* card_bm, |
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1343 BitMap* exp_region_bm, |
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1344 BitMap* exp_card_bm, |
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1345 bool verbose) : |
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1346 _cm(cm), |
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1347 _calc_cl(_cm->nextMarkBitMap(), _cm, exp_region_bm, exp_card_bm), |
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1348 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1349 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1350 _failures(0) { } |
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1351 |
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1352 int failures() const { return _failures; } |
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1353 |
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1354 bool doHeapRegion(HeapRegion* hr) { |
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1355 if (hr->continuesHumongous()) { |
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1356 // We will ignore these here and process them when their |
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1357 // associated "starts humongous" region is processed (see |
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1358 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1359 // associated "starts humongous" region to have their bit set to |
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1360 // 1 since, due to the region chunking in the parallel region |
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1361 // iteration, a "continues humongous" region might be visited |
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1362 // before its associated "starts humongous". |
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1363 return false; |
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1364 } |
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1365 |
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1366 int failures = 0; |
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1367 |
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1368 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1369 // this region and set the corresponding bits in the expected region |
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1370 // and card bitmaps. |
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1371 bool res = _calc_cl.doHeapRegion(hr); |
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1372 assert(res == false, "should be continuing"); |
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1373 |
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1374 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1375 Mutex::_no_safepoint_check_flag); |
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1376 |
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1377 // Verify the marked bytes for this region. |
|
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1378 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
|
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1379 size_t act_marked_bytes = hr->next_marked_bytes(); |
|
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|
1380 |
|
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|
1381 // We're not OK if expected marked bytes > actual marked bytes. It means |
|
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1382 // we have missed accounting some objects during the actual marking. |
|
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|
1383 if (exp_marked_bytes > act_marked_bytes) { |
|
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|
1384 if (_verbose) { |
|
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|
1385 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
|
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1386 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
|
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1387 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
|
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|
1388 } |
|
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|
1389 failures += 1; |
|
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|
1390 } |
|
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|
1391 |
|
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|
1392 // Verify the bit, for this region, in the actual and expected |
|
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1393 // (which was just calculated) region bit maps. |
|
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1394 // We're not OK if the bit in the calculated expected region |
|
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1395 // bitmap is set and the bit in the actual region bitmap is not. |
|
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1396 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
|
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|
1397 |
|
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|
1398 bool expected = _exp_region_bm->at(index); |
|
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1399 bool actual = _region_bm->at(index); |
|
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1400 if (expected && !actual) { |
|
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1401 if (_verbose) { |
|
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1402 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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1403 "expected: %s, actual: %s", |
|
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1404 hr->hrs_index(), |
|
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1405 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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|
1406 } |
|
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|
1407 failures += 1; |
|
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|
1408 } |
|
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|
1409 |
|
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|
1410 // Verify that the card bit maps for the cards spanned by the current |
|
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1411 // region match. We have an error if we have a set bit in the expected |
|
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|
1412 // bit map and the corresponding bit in the actual bitmap is not set. |
|
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|
1413 |
|
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|
1414 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
|
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1415 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
|
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|
1416 |
|
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|
1417 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
|
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1418 expected = _exp_card_bm->at(i); |
|
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1419 actual = _card_bm->at(i); |
|
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|
1420 |
|
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|
1421 if (expected && !actual) { |
|
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|
1422 if (_verbose) { |
|
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|
1423 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
|
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|
1424 "expected: %s, actual: %s", |
|
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|
1425 hr->hrs_index(), i, |
|
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|
1426 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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|
1427 } |
|
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|
1428 failures += 1; |
|
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|
1429 } |
|
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changeset
|
1430 } |
|
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|
1431 |
|
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|
1432 if (failures > 0 && _verbose) { |
|
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|
1433 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
|
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|
1434 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
|
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|
1435 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
|
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|
1436 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
|
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|
1437 } |
|
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|
1438 |
|
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|
1439 _failures += failures; |
|
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changeset
|
1440 |
|
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changeset
|
1441 // We could stop iteration over the heap when we |
|
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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|
1442 // find the first violating region by returning true. |
|
4836
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|
1443 return false; |
|
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|
1444 } |
| 342 | 1445 }; |
| 1446 | |
| 1447 | |
|
4836
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|
1448 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
|
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|
1449 protected: |
|
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|
1450 G1CollectedHeap* _g1h; |
|
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|
1451 ConcurrentMark* _cm; |
|
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|
1452 BitMap* _actual_region_bm; |
|
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|
1453 BitMap* _actual_card_bm; |
|
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|
1454 |
|
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|
1455 uint _n_workers; |
|
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|
1456 |
|
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|
1457 BitMap* _expected_region_bm; |
|
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|
1458 BitMap* _expected_card_bm; |
|
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|
1459 |
|
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changeset
|
1460 int _failures; |
|
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changeset
|
1461 bool _verbose; |
|
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|
1462 |
|
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|
1463 public: |
|
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changeset
|
1464 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
|
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|
1465 BitMap* region_bm, BitMap* card_bm, |
|
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changeset
|
1466 BitMap* expected_region_bm, BitMap* expected_card_bm) |
|
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|
1467 : AbstractGangTask("G1 verify final counting"), |
|
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|
1468 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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changeset
|
1469 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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changeset
|
1470 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
|
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|
1471 _failures(0), _verbose(false), |
|
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|
1472 _n_workers(0) { |
|
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changeset
|
1473 assert(VerifyDuringGC, "don't call this otherwise"); |
|
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|
1474 |
|
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changeset
|
1475 // Use the value already set as the number of active threads |
|
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|
1476 // in the call to run_task(). |
|
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|
1477 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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changeset
|
1478 assert( _g1h->workers()->active_workers() > 0, |
|
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changeset
|
1479 "Should have been previously set"); |
|
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|
1480 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1481 } else { |
|
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|
1482 _n_workers = 1; |
|
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changeset
|
1483 } |
|
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diff
changeset
|
1484 |
|
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changeset
|
1485 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
|
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changeset
|
1486 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
|
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changeset
|
1487 |
|
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changeset
|
1488 _verbose = _cm->verbose_medium(); |
|
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changeset
|
1489 } |
|
d30fa85f9994
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changeset
|
1490 |
|
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changeset
|
1491 void work(uint worker_id) { |
|
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changeset
|
1492 assert(worker_id < _n_workers, "invariant"); |
|
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changeset
|
1493 |
|
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changeset
|
1494 VerifyLiveObjectDataHRClosure verify_cl(_cm, |
|
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changeset
|
1495 _actual_region_bm, _actual_card_bm, |
|
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changeset
|
1496 _expected_region_bm, |
|
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changeset
|
1497 _expected_card_bm, |
|
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changeset
|
1498 _verbose); |
|
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changeset
|
1499 |
|
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1500 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1501 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
|
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|
1502 worker_id, |
|
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|
1503 _n_workers, |
|
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|
1504 HeapRegion::VerifyCountClaimValue); |
|
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1505 } else { |
|
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|
1506 _g1h->heap_region_iterate(&verify_cl); |
|
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|
1507 } |
|
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|
1508 |
|
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|
1509 Atomic::add(verify_cl.failures(), &_failures); |
|
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1510 } |
|
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|
1511 |
|
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|
1512 int failures() const { return _failures; } |
|
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1513 }; |
|
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1514 |
|
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1515 // Closure that finalizes the liveness counting data. |
|
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1516 // Used during the cleanup pause. |
|
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1517 // Sets the bits corresponding to the interval [NTAMS, top] |
|
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1518 // (which contains the implicitly live objects) in the |
|
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1519 // card liveness bitmap. Also sets the bit for each region, |
|
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1520 // containing live data, in the region liveness bitmap. |
|
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1521 |
|
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1522 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
|
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1523 public: |
|
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|
1524 FinalCountDataUpdateClosure(ConcurrentMark* cm, |
|
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1525 BitMap* region_bm, |
|
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1526 BitMap* card_bm) : |
|
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1527 CMCountDataClosureBase(cm, region_bm, card_bm) { } |
|
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1528 |
|
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|
1529 bool doHeapRegion(HeapRegion* hr) { |
|
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1530 |
|
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|
1531 if (hr->continuesHumongous()) { |
|
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1532 // We will ignore these here and process them when their |
|
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1533 // associated "starts humongous" region is processed (see |
|
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1534 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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1535 // associated "starts humongous" region to have their bit set to |
|
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1536 // 1 since, due to the region chunking in the parallel region |
|
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1537 // iteration, a "continues humongous" region might be visited |
|
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1538 // before its associated "starts humongous". |
|
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1539 return false; |
|
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|
1540 } |
|
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1541 |
|
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1542 HeapWord* ntams = hr->next_top_at_mark_start(); |
|
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1543 HeapWord* top = hr->top(); |
|
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1544 |
|
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1545 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
|
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1546 |
|
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1547 // Mark the allocated-since-marking portion... |
|
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1548 if (ntams < top) { |
|
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1549 // This definitely means the region has live objects. |
|
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1550 set_bit_for_region(hr); |
|
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1551 } |
|
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1552 |
|
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1553 // Now set the bits for [ntams, top] |
|
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1554 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
|
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1555 // set_card_bitmap_range() expects the last_idx to be with |
|
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1556 // the range of the bit map (see assertion in set_card_bitmap_range()), |
|
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1557 // so limit it to that range with this application of MIN2. |
|
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1558 BitMap::idx_t last_idx = MIN2(_cm->card_bitmap_index_for(top), |
|
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1559 _card_bm->size()-1); |
|
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1560 if (start_idx < _card_bm->size()) { |
|
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|
1561 set_card_bitmap_range(start_idx, last_idx); |
|
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1562 } else { |
|
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1563 // To reach here start_idx must be beyond the end of |
|
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1564 // the bit map and last_idx must have been limited by |
|
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1565 // the MIN2(). |
|
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|
1566 assert(start_idx == last_idx + 1, |
|
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|
1567 err_msg("Not beyond end start_idx " SIZE_FORMAT " last_idx " |
|
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|
1568 SIZE_FORMAT, start_idx, last_idx)); |
|
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|
1569 } |
|
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|
1570 |
|
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|
1571 // Set the bit for the region if it contains live data |
|
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1572 if (hr->next_marked_bytes() > 0) { |
|
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|
1573 set_bit_for_region(hr); |
|
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|
1574 } |
|
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|
1575 |
|
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|
1576 return false; |
|
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|
1577 } |
|
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|
1578 }; |
| 342 | 1579 |
| 1580 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1581 protected: | |
| 1582 G1CollectedHeap* _g1h; | |
|
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|
1583 ConcurrentMark* _cm; |
|
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|
1584 BitMap* _actual_region_bm; |
|
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|
1585 BitMap* _actual_card_bm; |
|
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|
1586 |
|
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|
1587 uint _n_workers; |
|
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|
1588 |
| 342 | 1589 public: |
|
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|
1590 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
|
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|
1591 : AbstractGangTask("G1 final counting"), |
|
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|
1592 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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1593 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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|
1594 _n_workers(0) { |
|
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|
1595 // Use the value already set as the number of active threads |
| 6011 | 1596 // in the call to run_task(). |
|
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|
1597 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1598 assert( _g1h->workers()->active_workers() > 0, |
|
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|
1599 "Should have been previously set"); |
|
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|
1600 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1601 } else { |
| 342 | 1602 _n_workers = 1; |
|
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|
1603 } |
| 342 | 1604 } |
| 1605 | |
|
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|
1606 void work(uint worker_id) { |
|
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|
1607 assert(worker_id < _n_workers, "invariant"); |
|
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|
1608 |
|
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|
1609 FinalCountDataUpdateClosure final_update_cl(_cm, |
|
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|
1610 _actual_region_bm, |
|
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|
1611 _actual_card_bm); |
|
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|
1612 |
|
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|
1613 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1614 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
|
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|
1615 worker_id, |
|
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|
1616 _n_workers, |
| 355 | 1617 HeapRegion::FinalCountClaimValue); |
| 342 | 1618 } else { |
|
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|
1619 _g1h->heap_region_iterate(&final_update_cl); |
| 342 | 1620 } |
| 1621 } | |
| 1622 }; | |
| 1623 | |
| 1624 class G1ParNoteEndTask; | |
| 1625 | |
| 1626 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1627 G1CollectedHeap* _g1; | |
| 1628 int _worker_num; | |
| 1629 size_t _max_live_bytes; | |
|
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|
1630 uint _regions_claimed; |
| 342 | 1631 size_t _freed_bytes; |
| 2173 | 1632 FreeRegionList* _local_cleanup_list; |
| 4072 | 1633 OldRegionSet* _old_proxy_set; |
| 2173 | 1634 HumongousRegionSet* _humongous_proxy_set; |
| 1635 HRRSCleanupTask* _hrrs_cleanup_task; | |
| 342 | 1636 double _claimed_region_time; |
| 1637 double _max_region_time; | |
| 1638 | |
| 1639 public: | |
| 1640 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1641 int worker_num, |
| 1642 FreeRegionList* local_cleanup_list, | |
| 4072 | 1643 OldRegionSet* old_proxy_set, |
| 2173 | 1644 HumongousRegionSet* humongous_proxy_set, |
|
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1645 HRRSCleanupTask* hrrs_cleanup_task) : |
|
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1646 _g1(g1), _worker_num(worker_num), |
|
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1647 _max_live_bytes(0), _regions_claimed(0), |
|
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1648 _freed_bytes(0), |
|
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1649 _claimed_region_time(0.0), _max_region_time(0.0), |
|
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1650 _local_cleanup_list(local_cleanup_list), |
|
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1651 _old_proxy_set(old_proxy_set), |
|
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1652 _humongous_proxy_set(humongous_proxy_set), |
|
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1653 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
|
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1654 |
| 342 | 1655 size_t freed_bytes() { return _freed_bytes; } |
| 1656 | |
|
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1657 bool doHeapRegion(HeapRegion *hr) { |
|
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1658 if (hr->continuesHumongous()) { |
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1659 return false; |
|
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1660 } |
|
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1661 // We use a claim value of zero here because all regions |
|
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1662 // were claimed with value 1 in the FinalCount task. |
|
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1663 _g1->reset_gc_time_stamps(hr); |
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1664 double start = os::elapsedTime(); |
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1665 _regions_claimed++; |
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1666 hr->note_end_of_marking(); |
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1667 _max_live_bytes += hr->max_live_bytes(); |
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1668 _g1->free_region_if_empty(hr, |
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1669 &_freed_bytes, |
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1670 _local_cleanup_list, |
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1671 _old_proxy_set, |
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1672 _humongous_proxy_set, |
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1673 _hrrs_cleanup_task, |
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|
1674 true /* par */); |
|
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1675 double region_time = (os::elapsedTime() - start); |
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1676 _claimed_region_time += region_time; |
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1677 if (region_time > _max_region_time) { |
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1678 _max_region_time = region_time; |
|
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|
1679 } |
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|
1680 return false; |
|
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|
1681 } |
| 342 | 1682 |
| 1683 size_t max_live_bytes() { return _max_live_bytes; } | |
|
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1684 uint regions_claimed() { return _regions_claimed; } |
| 342 | 1685 double claimed_region_time_sec() { return _claimed_region_time; } |
| 1686 double max_region_time_sec() { return _max_region_time; } | |
| 1687 }; | |
| 1688 | |
| 1689 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1690 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1691 |
| 342 | 1692 protected: |
| 1693 G1CollectedHeap* _g1h; | |
| 1694 size_t _max_live_bytes; | |
| 1695 size_t _freed_bytes; | |
| 2152 | 1696 FreeRegionList* _cleanup_list; |
| 1697 | |
| 342 | 1698 public: |
| 1699 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1700 FreeRegionList* cleanup_list) : |
| 342 | 1701 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1702 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1703 |
|
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1704 void work(uint worker_id) { |
| 342 | 1705 double start = os::elapsedTime(); |
| 2173 | 1706 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 4072 | 1707 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
| 2173 | 1708 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
| 1709 HRRSCleanupTask hrrs_cleanup_task; | |
|
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1710 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
| 4072 | 1711 &old_proxy_set, |
| 2173 | 1712 &humongous_proxy_set, |
| 1713 &hrrs_cleanup_task); | |
|
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1714 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1715 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
|
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1716 _g1h->workers()->active_workers(), |
| 355 | 1717 HeapRegion::NoteEndClaimValue); |
| 342 | 1718 } else { |
| 1719 _g1h->heap_region_iterate(&g1_note_end); | |
| 1720 } | |
| 1721 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1722 | |
| 2152 | 1723 // Now update the lists |
| 1724 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
| 1725 NULL /* free_list */, | |
| 4072 | 1726 &old_proxy_set, |
| 2173 | 1727 &humongous_proxy_set, |
| 2152 | 1728 true /* par */); |
| 342 | 1729 { |
| 1730 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 1731 _max_live_bytes += g1_note_end.max_live_bytes(); | |
| 1732 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1733 |
|
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1734 // If we iterate over the global cleanup list at the end of |
|
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1735 // cleanup to do this printing we will not guarantee to only |
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1736 // generate output for the newly-reclaimed regions (the list |
|
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1737 // might not be empty at the beginning of cleanup; we might |
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1738 // still be working on its previous contents). So we do the |
|
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1739 // printing here, before we append the new regions to the global |
|
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1740 // cleanup list. |
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1741 |
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1742 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
|
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1743 if (hr_printer->is_active()) { |
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1744 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1745 while (iter.more_available()) { |
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1746 HeapRegion* hr = iter.get_next(); |
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1747 hr_printer->cleanup(hr); |
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1748 } |
|
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1749 } |
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1750 |
| 2173 | 1751 _cleanup_list->add_as_tail(&local_cleanup_list); |
| 1752 assert(local_cleanup_list.is_empty(), "post-condition"); | |
| 1753 | |
| 1754 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1755 } |
| 1756 } | |
| 1757 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1758 size_t freed_bytes() { return _freed_bytes; } | |
| 1759 }; | |
| 1760 | |
| 1761 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 1762 protected: | |
| 1763 G1RemSet* _g1rs; | |
| 1764 BitMap* _region_bm; | |
| 1765 BitMap* _card_bm; | |
| 1766 public: | |
| 1767 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 1768 BitMap* region_bm, BitMap* card_bm) : | |
| 1769 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
|
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1770 _region_bm(region_bm), _card_bm(card_bm) { } |
| 342 | 1771 |
|
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1772 void work(uint worker_id) { |
|
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1773 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1774 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 1775 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 1776 } else { |
| 1777 _g1rs->scrub(_region_bm, _card_bm); | |
| 1778 } | |
| 1779 } | |
| 1780 | |
| 1781 }; | |
| 1782 | |
| 1783 void ConcurrentMark::cleanup() { | |
| 1784 // world is stopped at this checkpoint | |
| 1785 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1786 "world should be stopped"); | |
| 1787 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1788 | |
| 1789 // If a full collection has happened, we shouldn't do this. | |
| 1790 if (has_aborted()) { | |
| 1791 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1792 return; | |
| 1793 } | |
| 1794 | |
| 4072 | 1795 HRSPhaseSetter x(HRSPhaseCleanup); |
| 2152 | 1796 g1h->verify_region_sets_optional(); |
| 1797 | |
|
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1798 if (VerifyDuringGC) { |
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1799 HandleMark hm; // handle scope |
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1800 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1801 Universe::heap()->prepare_for_verify(); |
| 6008 | 1802 Universe::verify(/* silent */ false, |
|
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1803 /* option */ VerifyOption_G1UsePrevMarking); |
|
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1804 } |
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1805 |
| 342 | 1806 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 1807 g1p->record_concurrent_mark_cleanup_start(); | |
| 1808 | |
| 1809 double start = os::elapsedTime(); | |
| 1810 | |
| 2173 | 1811 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 1812 | |
|
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1813 uint n_workers; |
|
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1814 |
| 342 | 1815 // Do counting once more with the world stopped for good measure. |
|
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1816 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1817 |
|
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1818 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1819 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
| 355 | 1820 "sanity check"); |
| 1821 | |
| 4711 | 1822 g1h->set_par_threads(); |
| 1823 n_workers = g1h->n_par_threads(); | |
|
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|
1824 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 1825 "Should not have been reset"); |
| 342 | 1826 g1h->workers()->run_task(&g1_par_count_task); |
|
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1827 // Done with the parallel phase so reset to 0. |
| 342 | 1828 g1h->set_par_threads(0); |
| 355 | 1829 |
|
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1830 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
| 355 | 1831 "sanity check"); |
| 342 | 1832 } else { |
| 4711 | 1833 n_workers = 1; |
| 342 | 1834 g1_par_count_task.work(0); |
| 1835 } | |
| 1836 | |
|
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1837 if (VerifyDuringGC) { |
|
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1838 // Verify that the counting data accumulated during marking matches |
|
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|
1839 // that calculated by walking the marking bitmap. |
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1840 |
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1841 // Bitmaps to hold expected values |
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|
1842 BitMap expected_region_bm(_region_bm.size(), false); |
|
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|
1843 BitMap expected_card_bm(_card_bm.size(), false); |
|
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|
1844 |
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1845 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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1846 &_region_bm, |
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1847 &_card_bm, |
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1848 &expected_region_bm, |
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1849 &expected_card_bm); |
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1850 |
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1851 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1852 g1h->set_par_threads((int)n_workers); |
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1853 g1h->workers()->run_task(&g1_par_verify_task); |
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1854 // Done with the parallel phase so reset to 0. |
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1855 g1h->set_par_threads(0); |
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1856 |
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1857 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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1858 "sanity check"); |
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1859 } else { |
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1860 g1_par_verify_task.work(0); |
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1861 } |
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1862 |
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1863 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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1864 } |
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1865 |
| 342 | 1866 size_t start_used_bytes = g1h->used(); |
| 1867 g1h->set_marking_complete(); | |
| 1868 | |
| 1869 double count_end = os::elapsedTime(); | |
| 1870 double this_final_counting_time = (count_end - start); | |
| 1871 _total_counting_time += this_final_counting_time; | |
| 1872 | |
|
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1873 if (G1PrintRegionLivenessInfo) { |
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1874 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1875 _g1h->heap_region_iterate(&cl); |
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1876 } |
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1877 |
| 342 | 1878 // Install newly created mark bitMap as "prev". |
| 1879 swapMarkBitMaps(); | |
| 1880 | |
| 1881 g1h->reset_gc_time_stamp(); | |
| 1882 | |
| 1883 // Note end of marking in all heap regions. | |
| 2152 | 1884 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
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1885 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1886 g1h->set_par_threads((int)n_workers); |
| 342 | 1887 g1h->workers()->run_task(&g1_par_note_end_task); |
| 1888 g1h->set_par_threads(0); | |
| 355 | 1889 |
| 1890 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 1891 "sanity check"); | |
| 342 | 1892 } else { |
| 1893 g1_par_note_end_task.work(0); | |
| 1894 } | |
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1895 g1h->check_gc_time_stamps(); |
| 2152 | 1896 |
| 1897 if (!cleanup_list_is_empty()) { | |
| 1898 // The cleanup list is not empty, so we'll have to process it | |
| 1899 // concurrently. Notify anyone else that might be wanting free | |
| 1900 // regions that there will be more free regions coming soon. | |
| 1901 g1h->set_free_regions_coming(); | |
| 1902 } | |
| 342 | 1903 |
| 1904 // call below, since it affects the metric by which we sort the heap | |
| 1905 // regions. | |
| 1906 if (G1ScrubRemSets) { | |
| 1907 double rs_scrub_start = os::elapsedTime(); | |
| 1908 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
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1909 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1910 g1h->set_par_threads((int)n_workers); |
| 342 | 1911 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 1912 g1h->set_par_threads(0); | |
| 355 | 1913 |
| 1914 assert(g1h->check_heap_region_claim_values( | |
| 1915 HeapRegion::ScrubRemSetClaimValue), | |
| 1916 "sanity check"); | |
| 342 | 1917 } else { |
| 1918 g1_par_scrub_rs_task.work(0); | |
| 1919 } | |
| 1920 | |
| 1921 double rs_scrub_end = os::elapsedTime(); | |
| 1922 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 1923 _total_rs_scrub_time += this_rs_scrub_time; | |
| 1924 } | |
| 1925 | |
| 1926 // this will also free any regions totally full of garbage objects, | |
| 1927 // and sort the regions. | |
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1928 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 1929 |
| 1930 // Statistics. | |
| 1931 double end = os::elapsedTime(); | |
| 1932 _cleanup_times.add((end - start) * 1000.0); | |
| 1933 | |
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1934 if (G1Log::fine()) { |
| 342 | 1935 g1h->print_size_transition(gclog_or_tty, |
| 1936 start_used_bytes, | |
| 1937 g1h->used(), | |
| 1938 g1h->capacity()); | |
| 1939 } | |
| 1940 | |
|
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1941 // Clean up will have freed any regions completely full of garbage. |
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1942 // Update the soft reference policy with the new heap occupancy. |
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1943 Universe::update_heap_info_at_gc(); |
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1944 |
| 342 | 1945 // We need to make this be a "collection" so any collection pause that |
| 1946 // races with it goes around and waits for completeCleanup to finish. | |
| 1947 g1h->increment_total_collections(); | |
| 1948 | |
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1949 // We reclaimed old regions so we should calculate the sizes to make |
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1950 // sure we update the old gen/space data. |
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1951 g1h->g1mm()->update_sizes(); |
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1952 |
| 751 | 1953 if (VerifyDuringGC) { |
|
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1954 HandleMark hm; // handle scope |
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1955 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1956 Universe::heap()->prepare_for_verify(); |
| 6008 | 1957 Universe::verify(/* silent */ false, |
|
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1958 /* option */ VerifyOption_G1UsePrevMarking); |
| 342 | 1959 } |
| 2152 | 1960 |
| 1961 g1h->verify_region_sets_optional(); | |
| 342 | 1962 } |
| 1963 | |
| 1964 void ConcurrentMark::completeCleanup() { | |
| 1965 if (has_aborted()) return; | |
| 1966 | |
| 2152 | 1967 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1968 | |
| 1969 _cleanup_list.verify_optional(); | |
| 2361 | 1970 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 1971 |
| 1972 if (G1ConcRegionFreeingVerbose) { | |
| 1973 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
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1974 "cleanup list has %u entries", |
| 2152 | 1975 _cleanup_list.length()); |
| 1976 } | |
| 1977 | |
| 1978 // Noone else should be accessing the _cleanup_list at this point, | |
| 1979 // so it's not necessary to take any locks | |
| 1980 while (!_cleanup_list.is_empty()) { | |
| 1981 HeapRegion* hr = _cleanup_list.remove_head(); | |
| 1982 assert(hr != NULL, "the list was not empty"); | |
|
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1983 hr->par_clear(); |
| 2361 | 1984 tmp_free_list.add_as_tail(hr); |
| 2152 | 1985 |
| 1986 // Instead of adding one region at a time to the secondary_free_list, | |
| 1987 // we accumulate them in the local list and move them a few at a | |
| 1988 // time. This also cuts down on the number of notify_all() calls | |
| 1989 // we do during this process. We'll also append the local list when | |
| 1990 // _cleanup_list is empty (which means we just removed the last | |
| 1991 // region from the _cleanup_list). | |
| 2361 | 1992 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 1993 _cleanup_list.is_empty()) { |
| 1994 if (G1ConcRegionFreeingVerbose) { | |
| 1995 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
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1996 "appending %u entries to the secondary_free_list, " |
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1997 "cleanup list still has %u entries", |
| 2361 | 1998 tmp_free_list.length(), |
| 2152 | 1999 _cleanup_list.length()); |
| 342 | 2000 } |
| 2152 | 2001 |
| 2002 { | |
| 2003 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 2361 | 2004 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
| 2152 | 2005 SecondaryFreeList_lock->notify_all(); |
| 2006 } | |
| 2007 | |
| 2008 if (G1StressConcRegionFreeing) { | |
| 2009 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 2010 os::sleep(Thread::current(), (jlong) 1, false); | |
| 2011 } | |
| 2012 } | |
| 342 | 2013 } |
| 2014 } | |
| 2361 | 2015 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 2016 } |
| 2017 | |
|
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2018 // Support closures for reference procssing in G1 |
|
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2019 |
|
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|
2020 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
|
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2021 HeapWord* addr = (HeapWord*)obj; |
|
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2022 return addr != NULL && |
|
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2023 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
|
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2024 } |
| 342 | 2025 |
|
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2026 class G1CMKeepAliveClosure: public ExtendedOopClosure { |
| 342 | 2027 G1CollectedHeap* _g1; |
| 2028 ConcurrentMark* _cm; | |
| 2029 public: | |
|
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2030 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
|
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2031 _g1(g1), _cm(cm) { |
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2032 assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
|
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2033 } |
| 342 | 2034 |
|
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2035 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2036 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2037 |
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2038 template <class T> void do_oop_work(T* p) { |
|
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2039 oop obj = oopDesc::load_decode_heap_oop(p); |
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2040 HeapWord* addr = (HeapWord*)obj; |
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2041 |
|
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2042 if (_cm->verbose_high()) { |
|
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2043 gclog_or_tty->print_cr("\t[0] we're looking at location " |
|
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2044 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
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2045 p, (void*) obj); |
|
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2046 } |
|
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2047 |
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2048 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
|
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2049 _cm->mark_and_count(obj); |
|
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2050 _cm->mark_stack_push(obj); |
| 342 | 2051 } |
| 2052 } | |
| 2053 }; | |
| 2054 | |
| 2055 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
|
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2056 ConcurrentMark* _cm; |
| 342 | 2057 CMMarkStack* _markStack; |
| 2058 G1CMKeepAliveClosure* _oopClosure; | |
| 2059 public: | |
|
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2060 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
| 342 | 2061 G1CMKeepAliveClosure* oopClosure) : |
|
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2062 _cm(cm), |
| 342 | 2063 _markStack(markStack), |
|
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2064 _oopClosure(oopClosure) { } |
| 342 | 2065 |
| 2066 void do_void() { | |
|
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2067 _markStack->drain(_oopClosure, _cm->nextMarkBitMap(), false); |
| 342 | 2068 } |
| 2069 }; | |
| 2070 | |
|
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2071 // 'Keep Alive' closure used by parallel reference processing. |
|
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2072 // An instance of this closure is used in the parallel reference processing |
|
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2073 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2074 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2075 // placed on to discovered ref lists once so we can mark and push with no |
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2076 // need to check whether the object has already been marked. Using the |
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2077 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2078 // operating on the global mark stack. This means that an individual |
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2079 // worker would be doing lock-free pushes while it processes its own |
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2080 // discovered ref list followed by drain call. If the discovered ref lists |
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2081 // are unbalanced then this could cause interference with the other |
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2082 // workers. Using a CMTask (and its embedded local data structures) |
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2083 // avoids that potential interference. |
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2084 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2085 ConcurrentMark* _cm; |
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2086 CMTask* _task; |
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2087 int _ref_counter_limit; |
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2088 int _ref_counter; |
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2089 public: |
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2090 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2091 _cm(cm), _task(task), |
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2092 _ref_counter_limit(G1RefProcDrainInterval) { |
|
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2093 assert(_ref_counter_limit > 0, "sanity"); |
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2094 _ref_counter = _ref_counter_limit; |
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2095 } |
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2096 |
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2097 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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2098 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2099 |
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2100 template <class T> void do_oop_work(T* p) { |
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2101 if (!_cm->has_overflown()) { |
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2102 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2103 if (_cm->verbose_high()) { |
|
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2104 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
|
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2105 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
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2106 _task->task_id(), p, (void*) obj); |
|
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2107 } |
|
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2108 |
|
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|
2109 _task->deal_with_reference(obj); |
|
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2110 _ref_counter--; |
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2111 |
|
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2112 if (_ref_counter == 0) { |
|
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2113 // We have dealt with _ref_counter_limit references, pushing them and objects |
|
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|
2114 // reachable from them on to the local stack (and possibly the global stack). |
|
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2115 // Call do_marking_step() to process these entries. We call the routine in a |
|
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2116 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
|
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2117 // with the entries that we've pushed as a result of the deal_with_reference |
|
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2118 // calls above) or we overflow. |
|
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2119 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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2120 // while there may still be some work to do. (See the comment at the |
|
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2121 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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|
2122 // is reaching the specified time target.) It is only when |
|
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2123 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2124 // that the marking has completed. |
|
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|
2125 do { |
|
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|
2126 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
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|
2127 _task->do_marking_step(mark_step_duration_ms, |
|
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|
2128 false /* do_stealing */, |
|
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|
2129 false /* do_termination */); |
|
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|
2130 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2131 _ref_counter = _ref_counter_limit; |
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|
2132 } |
|
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|
2133 } else { |
|
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|
2134 if (_cm->verbose_high()) { |
|
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|
2135 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
|
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|
2136 } |
|
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|
2137 } |
|
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|
2138 } |
|
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|
2139 }; |
|
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|
2140 |
|
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|
2141 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
|
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|
2142 ConcurrentMark* _cm; |
|
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|
2143 CMTask* _task; |
|
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|
2144 public: |
|
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|
2145 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
|
4836
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|
2146 _cm(cm), _task(task) { } |
|
2174
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|
2147 |
|
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|
2148 void do_void() { |
|
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|
2149 do { |
|
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|
2150 if (_cm->verbose_high()) { |
|
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|
2151 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
|
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|
2152 _task->task_id()); |
|
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|
2153 } |
|
2174
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|
2154 |
|
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|
2155 // We call CMTask::do_marking_step() to completely drain the local and |
|
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|
2156 // global marking stacks. The routine is called in a loop, which we'll |
|
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|
2157 // exit if there's nothing more to do (i.e. we'completely drained the |
|
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|
2158 // entries that were pushed as a result of applying the |
|
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|
2159 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
|
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|
2160 // lists above) or we overflow the global marking stack. |
|
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|
2161 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
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|
2162 // while there may still be some work to do. (See the comment at the |
|
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|
2163 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
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|
2164 // is reaching the specified time target.) It is only when |
|
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|
2165 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
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|
2166 // that the marking has completed. |
|
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|
2167 |
|
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|
2168 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2169 true /* do_stealing */, |
|
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|
2170 true /* do_termination */); |
|
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|
2171 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2172 } |
|
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|
2173 }; |
|
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|
2174 |
|
3979
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|
2175 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
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|
2176 // reference processing at the end of G1 concurrent marking |
|
4dfb2df418f2
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|
2177 |
|
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|
2178 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
2174
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|
2179 private: |
|
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|
2180 G1CollectedHeap* _g1h; |
|
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changeset
|
2181 ConcurrentMark* _cm; |
|
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|
2182 WorkGang* _workers; |
|
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|
2183 int _active_workers; |
|
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|
2184 |
|
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|
2185 public: |
|
3979
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|
2186 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
2174
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|
2187 ConcurrentMark* cm, |
|
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|
2188 WorkGang* workers, |
|
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|
2189 int n_workers) : |
|
4093
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|
2190 _g1h(g1h), _cm(cm), |
|
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|
2191 _workers(workers), _active_workers(n_workers) { } |
|
2174
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|
2192 |
|
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|
2193 // Executes the given task using concurrent marking worker threads. |
|
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changeset
|
2194 virtual void execute(ProcessTask& task); |
|
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changeset
|
2195 virtual void execute(EnqueueTask& task); |
|
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|
2196 }; |
|
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|
2197 |
|
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2198 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
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2199 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2200 ProcessTask& _proc_task; |
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2201 G1CollectedHeap* _g1h; |
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2202 ConcurrentMark* _cm; |
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2203 |
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2204 public: |
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2205 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
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2206 G1CollectedHeap* g1h, |
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2207 ConcurrentMark* cm) : |
|
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2208 AbstractGangTask("Process reference objects in parallel"), |
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2209 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
|
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2210 |
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2211 virtual void work(uint worker_id) { |
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2212 CMTask* marking_task = _cm->task(worker_id); |
|
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2213 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2214 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
|
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2215 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2216 |
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2217 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
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2218 } |
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2219 }; |
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2220 |
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2221 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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2222 assert(_workers != NULL, "Need parallel worker threads."); |
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2223 |
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2224 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
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2225 |
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2226 // We need to reset the phase for each task execution so that |
|
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2227 // the termination protocol of CMTask::do_marking_step works. |
|
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2228 _cm->set_phase(_active_workers, false /* concurrent */); |
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2229 _g1h->set_par_threads(_active_workers); |
|
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2230 _workers->run_task(&proc_task_proxy); |
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2231 _g1h->set_par_threads(0); |
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2232 } |
|
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2233 |
|
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2234 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
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2235 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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2236 EnqueueTask& _enq_task; |
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2237 |
|
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2238 public: |
|
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2239 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
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2240 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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2241 _enq_task(enq_task) { } |
|
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2242 |
|
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2243 virtual void work(uint worker_id) { |
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2244 _enq_task.work(worker_id); |
|
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2245 } |
|
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2246 }; |
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2247 |
|
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2248 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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2249 assert(_workers != NULL, "Need parallel worker threads."); |
|
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2250 |
|
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2251 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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2252 |
|
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2253 _g1h->set_par_threads(_active_workers); |
|
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2254 _workers->run_task(&enq_task_proxy); |
|
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2255 _g1h->set_par_threads(0); |
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|
2256 } |
|
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|
2257 |
| 342 | 2258 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
| 2259 ResourceMark rm; | |
| 2260 HandleMark hm; | |
|
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2261 |
|
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2262 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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2263 |
|
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|
2264 // Is alive closure. |
|
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|
2265 G1CMIsAliveClosure g1_is_alive(g1h); |
|
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2266 |
|
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2267 // Inner scope to exclude the cleaning of the string and symbol |
|
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|
2268 // tables from the displayed time. |
|
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|
2269 { |
|
6007
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|
2270 if (G1Log::finer()) { |
|
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|
2271 gclog_or_tty->put(' '); |
|
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|
2272 } |
|
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|
2273 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
|
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2274 |
|
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|
2275 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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2276 |
|
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|
2277 // See the comment in G1CollectedHeap::ref_processing_init() |
|
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|
2278 // about how reference processing currently works in G1. |
|
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|
2279 |
|
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|
2280 // Process weak references. |
|
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|
2281 rp->setup_policy(clear_all_soft_refs); |
|
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|
2282 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
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|
2283 |
|
4836
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|
2284 G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
|
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|
2285 G1CMDrainMarkingStackClosure |
|
4836
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|
2286 g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
|
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|
2287 |
|
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|
2288 // We use the work gang from the G1CollectedHeap and we utilize all |
|
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|
2289 // the worker threads. |
|
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2290 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
|
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|
2291 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
|
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2292 |
|
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|
2293 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
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|
2294 g1h->workers(), active_workers); |
|
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|
2295 |
|
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|
2296 if (rp->processing_is_mt()) { |
|
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|
2297 // Set the degree of MT here. If the discovery is done MT, there |
|
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|
2298 // may have been a different number of threads doing the discovery |
|
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|
2299 // and a different number of discovered lists may have Ref objects. |
|
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|
2300 // That is OK as long as the Reference lists are balanced (see |
|
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|
2301 // balance_all_queues() and balance_queues()). |
|
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|
2302 rp->set_active_mt_degree(active_workers); |
|
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|
2303 |
|
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|
2304 rp->process_discovered_references(&g1_is_alive, |
|
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|
2305 &g1_keep_alive, |
|
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|
2306 &g1_drain_mark_stack, |
|
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|
2307 &par_task_executor); |
|
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|
2308 |
|
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|
2309 // The work routines of the parallel keep_alive and drain_marking_stack |
|
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|
2310 // will set the has_overflown flag if we overflow the global marking |
|
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|
2311 // stack. |
|
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|
2312 } else { |
|
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|
2313 rp->process_discovered_references(&g1_is_alive, |
|
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|
2314 &g1_keep_alive, |
|
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|
2315 &g1_drain_mark_stack, |
|
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|
2316 NULL); |
|
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|
2317 } |
|
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|
2318 |
|
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|
2319 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
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|
2320 "mark stack should be empty (unless it overflowed)"); |
|
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|
2321 if (_markStack.overflow()) { |
|
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|
2322 // Should have been done already when we tried to push an |
|
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|
2323 // entry on to the global mark stack. But let's do it again. |
|
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|
2324 set_has_overflown(); |
|
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2325 } |
|
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2326 |
|
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2327 if (rp->processing_is_mt()) { |
|
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|
2328 assert(rp->num_q() == active_workers, "why not"); |
|
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2329 rp->enqueue_discovered_references(&par_task_executor); |
|
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2330 } else { |
|
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|
2331 rp->enqueue_discovered_references(); |
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|
2332 } |
|
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|
2333 |
|
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|
2334 rp->verify_no_references_recorded(); |
|
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2335 assert(!rp->discovery_enabled(), "Post condition"); |
|
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|
2336 } |
|
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2337 |
|
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2338 // Now clean up stale oops in StringTable |
|
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2339 StringTable::unlink(&g1_is_alive); |
|
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2340 // Clean up unreferenced symbols in symbol table. |
|
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2341 SymbolTable::unlink(); |
| 342 | 2342 } |
| 2343 | |
| 2344 void ConcurrentMark::swapMarkBitMaps() { | |
| 2345 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2346 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2347 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2348 } | |
| 2349 | |
| 2350 class CMRemarkTask: public AbstractGangTask { | |
| 2351 private: | |
| 2352 ConcurrentMark *_cm; | |
| 2353 | |
| 2354 public: | |
|
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2355 void work(uint worker_id) { |
| 342 | 2356 // Since all available tasks are actually started, we should |
| 2357 // only proceed if we're supposed to be actived. | |
|
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2358 if (worker_id < _cm->active_tasks()) { |
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2359 CMTask* task = _cm->task(worker_id); |
| 342 | 2360 task->record_start_time(); |
| 2361 do { | |
|
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2362 task->do_marking_step(1000000000.0 /* something very large */, |
|
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2363 true /* do_stealing */, |
|
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|
2364 true /* do_termination */); |
| 342 | 2365 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2366 // If we overflow, then we do not want to restart. We instead | |
| 2367 // want to abort remark and do concurrent marking again. | |
| 2368 task->record_end_time(); | |
| 2369 } | |
| 2370 } | |
| 2371 | |
| 4711 | 2372 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
|
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2373 AbstractGangTask("Par Remark"), _cm(cm) { |
| 4711 | 2374 _cm->terminator()->reset_for_reuse(active_workers); |
|
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|
2375 } |
| 342 | 2376 }; |
| 2377 | |
| 2378 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2379 ResourceMark rm; | |
| 2380 HandleMark hm; | |
| 2381 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2382 | |
| 2383 g1h->ensure_parsability(false); | |
| 2384 | |
|
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|
2385 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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2386 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
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|
2387 // this is remark, so we'll use up all active threads |
|
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2388 uint active_workers = g1h->workers()->active_workers(); |
|
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2389 if (active_workers == 0) { |
|
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2390 assert(active_workers > 0, "Should have been set earlier"); |
|
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2391 active_workers = (uint) ParallelGCThreads; |
|
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|
2392 g1h->workers()->set_active_workers(active_workers); |
|
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2393 } |
|
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2394 set_phase(active_workers, false /* concurrent */); |
|
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|
2395 // Leave _parallel_marking_threads at it's |
|
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|
2396 // value originally calculated in the ConcurrentMark |
|
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|
2397 // constructor and pass values of the active workers |
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|
2398 // through the gang in the task. |
| 342 | 2399 |
| 4711 | 2400 CMRemarkTask remarkTask(this, active_workers); |
|
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|
2401 g1h->set_par_threads(active_workers); |
| 342 | 2402 g1h->workers()->run_task(&remarkTask); |
| 2403 g1h->set_par_threads(0); | |
| 2404 } else { | |
|
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|
2405 G1CollectedHeap::StrongRootsScope srs(g1h); |
| 342 | 2406 // this is remark, so we'll use up all available threads |
|
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|
2407 uint active_workers = 1; |
|
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|
2408 set_phase(active_workers, false /* concurrent */); |
| 342 | 2409 |
| 4711 | 2410 CMRemarkTask remarkTask(this, active_workers); |
| 342 | 2411 // We will start all available threads, even if we decide that the |
| 2412 // active_workers will be fewer. The extra ones will just bail out | |
| 2413 // immediately. | |
| 2414 remarkTask.work(0); | |
| 2415 } | |
|
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|
2416 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
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|
2417 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2418 |
| 2419 print_stats(); | |
| 2420 | |
| 2421 #if VERIFY_OBJS_PROCESSED | |
| 2422 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
| 2423 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
| 2424 _scan_obj_cl.objs_processed, | |
| 2425 ThreadLocalObjQueue::objs_enqueued); | |
| 2426 guarantee(_scan_obj_cl.objs_processed == | |
| 2427 ThreadLocalObjQueue::objs_enqueued, | |
| 2428 "Different number of objs processed and enqueued."); | |
| 2429 } | |
| 2430 #endif | |
| 2431 } | |
| 2432 | |
| 1044 | 2433 #ifndef PRODUCT |
| 2434 | |
| 1388 | 2435 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2436 private: |
| 2437 G1CollectedHeap* _g1h; | |
| 2438 outputStream* _out; | |
|
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|
2439 VerifyOption _vo; |
| 1388 | 2440 bool _all; |
| 342 | 2441 |
| 2442 public: | |
|
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|
2443 PrintReachableOopClosure(outputStream* out, |
|
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|
2444 VerifyOption vo, |
| 1388 | 2445 bool all) : |
| 1044 | 2446 _g1h(G1CollectedHeap::heap()), |
|
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|
2447 _out(out), _vo(vo), _all(all) { } |
| 342 | 2448 |
|
845
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|
2449 void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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|
2450 void do_oop( oop* p) { do_oop_work(p); } |
|
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2451 |
|
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|
2452 template <class T> void do_oop_work(T* p) { |
|
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|
2453 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2454 const char* str = NULL; |
| 2455 const char* str2 = ""; | |
| 2456 | |
| 1388 | 2457 if (obj == NULL) { |
| 2458 str = ""; | |
| 2459 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2460 str = " O"; | |
| 2461 } else { | |
| 342 | 2462 HeapRegion* hr = _g1h->heap_region_containing(obj); |
|
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|
2463 guarantee(hr != NULL, "invariant"); |
|
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|
2464 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
|
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|
2465 bool marked = _g1h->is_marked(obj, _vo); |
| 1044 | 2466 |
| 2467 if (over_tams) { | |
| 1388 | 2468 str = " >"; |
| 2469 if (marked) { | |
| 342 | 2470 str2 = " AND MARKED"; |
| 1044 | 2471 } |
| 1388 | 2472 } else if (marked) { |
| 2473 str = " M"; | |
| 1044 | 2474 } else { |
| 1388 | 2475 str = " NOT"; |
| 1044 | 2476 } |
| 342 | 2477 } |
| 2478 | |
| 1388 | 2479 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
| 342 | 2480 p, (void*) obj, str, str2); |
| 2481 } | |
| 2482 }; | |
| 2483 | |
| 1388 | 2484 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2485 private: |
|
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|
2486 G1CollectedHeap* _g1h; |
|
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|
2487 outputStream* _out; |
|
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|
2488 VerifyOption _vo; |
|
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|
2489 bool _all; |
|
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|
2490 HeapRegion* _hr; |
| 342 | 2491 |
| 2492 public: | |
|
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|
2493 PrintReachableObjectClosure(outputStream* out, |
|
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|
2494 VerifyOption vo, |
| 1388 | 2495 bool all, |
| 2496 HeapRegion* hr) : | |
|
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|
2497 _g1h(G1CollectedHeap::heap()), |
|
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|
2498 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2499 |
| 2500 void do_object(oop o) { | |
|
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2501 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
|
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|
2502 bool marked = _g1h->is_marked(o, _vo); |
| 1388 | 2503 bool print_it = _all || over_tams || marked; |
| 2504 | |
| 2505 if (print_it) { | |
| 2506 _out->print_cr(" "PTR_FORMAT"%s", | |
| 2507 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
|
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|
2508 PrintReachableOopClosure oopCl(_out, _vo, _all); |
|
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|
2509 o->oop_iterate_no_header(&oopCl); |
| 1388 | 2510 } |
| 342 | 2511 } |
| 2512 }; | |
| 2513 | |
| 1388 | 2514 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2515 private: |
|
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2516 G1CollectedHeap* _g1h; |
|
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|
2517 outputStream* _out; |
|
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|
2518 VerifyOption _vo; |
|
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|
2519 bool _all; |
| 342 | 2520 |
| 2521 public: | |
| 2522 bool doHeapRegion(HeapRegion* hr) { | |
| 2523 HeapWord* b = hr->bottom(); | |
| 2524 HeapWord* e = hr->end(); | |
| 2525 HeapWord* t = hr->top(); | |
|
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|
2526 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
| 342 | 2527 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
| 1044 | 2528 "TAMS: "PTR_FORMAT, b, e, t, p); |
| 1388 | 2529 _out->cr(); |
| 2530 | |
| 2531 HeapWord* from = b; | |
| 2532 HeapWord* to = t; | |
| 2533 | |
| 2534 if (to > from) { | |
| 2535 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
| 2536 _out->cr(); | |
|
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|
2537 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2538 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2539 _out->cr(); | |
| 2540 } | |
| 342 | 2541 |
| 2542 return false; | |
| 2543 } | |
| 2544 | |
|
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|
2545 PrintReachableRegionClosure(outputStream* out, |
|
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|
2546 VerifyOption vo, |
| 1388 | 2547 bool all) : |
|
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|
2548 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
| 342 | 2549 }; |
| 2550 | |
| 1388 | 2551 void ConcurrentMark::print_reachable(const char* str, |
|
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|
2552 VerifyOption vo, |
| 1388 | 2553 bool all) { |
| 2554 gclog_or_tty->cr(); | |
| 2555 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 2556 |
| 2557 if (G1PrintReachableBaseFile == NULL) { | |
| 2558 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 2559 return; | |
| 2560 } | |
| 2561 | |
| 2562 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 2563 (JVM_MAXPATHLEN - 1)) { | |
| 2564 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 2565 return; | |
| 2566 } | |
| 2567 | |
| 2568 char file_name[JVM_MAXPATHLEN]; | |
| 2569 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 2570 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 2571 | |
| 2572 fileStream fout(file_name); | |
| 2573 if (!fout.is_open()) { | |
| 2574 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 2575 return; | |
| 2576 } | |
| 2577 | |
| 2578 outputStream* out = &fout; | |
|
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2579 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
| 1044 | 2580 out->cr(); |
| 2581 | |
| 1388 | 2582 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2583 out->cr(); |
|
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2584 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 2585 _g1h->heap_region_iterate(&rcl); |
| 1044 | 2586 out->cr(); |
| 2587 | |
| 2588 gclog_or_tty->print_cr(" done"); | |
| 1388 | 2589 gclog_or_tty->flush(); |
| 342 | 2590 } |
| 2591 | |
| 1044 | 2592 #endif // PRODUCT |
| 2593 | |
|
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2594 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 2595 // Note we are overriding the read-only view of the prev map here, via |
| 2596 // the cast. | |
| 2597 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
|
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2598 } |
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2599 |
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2600 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 2601 _nextMarkBitMap->clearRange(mr); |
| 2602 } | |
| 2603 | |
|
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2604 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
|
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2605 clearRangePrevBitmap(mr); |
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2606 clearRangeNextBitmap(mr); |
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2607 } |
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2608 |
| 342 | 2609 HeapRegion* |
| 2610 ConcurrentMark::claim_region(int task_num) { | |
| 2611 // "checkpoint" the finger | |
| 2612 HeapWord* finger = _finger; | |
| 2613 | |
| 2614 // _heap_end will not change underneath our feet; it only changes at | |
| 2615 // yield points. | |
| 2616 while (finger < _heap_end) { | |
|
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2617 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 2618 |
| 3771 | 2619 // Note on how this code handles humongous regions. In the |
| 2620 // normal case the finger will reach the start of a "starts | |
| 2621 // humongous" (SH) region. Its end will either be the end of the | |
| 2622 // last "continues humongous" (CH) region in the sequence, or the | |
| 2623 // standard end of the SH region (if the SH is the only region in | |
| 2624 // the sequence). That way claim_region() will skip over the CH | |
| 2625 // regions. However, there is a subtle race between a CM thread | |
| 2626 // executing this method and a mutator thread doing a humongous | |
| 2627 // object allocation. The two are not mutually exclusive as the CM | |
| 2628 // thread does not need to hold the Heap_lock when it gets | |
| 2629 // here. So there is a chance that claim_region() will come across | |
| 2630 // a free region that's in the progress of becoming a SH or a CH | |
| 2631 // region. In the former case, it will either | |
| 2632 // a) Miss the update to the region's end, in which case it will | |
| 2633 // visit every subsequent CH region, will find their bitmaps | |
| 2634 // empty, and do nothing, or | |
| 2635 // b) Will observe the update of the region's end (in which case | |
| 2636 // it will skip the subsequent CH regions). | |
| 2637 // If it comes across a region that suddenly becomes CH, the | |
| 2638 // scenario will be similar to b). So, the race between | |
| 2639 // claim_region() and a humongous object allocation might force us | |
| 2640 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 2641 // iterations) but it should not introduce and correctness issues. | |
| 2642 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
| 342 | 2643 HeapWord* bottom = curr_region->bottom(); |
| 2644 HeapWord* end = curr_region->end(); | |
| 2645 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 2646 | |
| 3771 | 2647 if (verbose_low()) { |
| 342 | 2648 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
| 2649 "["PTR_FORMAT", "PTR_FORMAT"), " | |
| 2650 "limit = "PTR_FORMAT, | |
| 2651 task_num, curr_region, bottom, end, limit); | |
| 3771 | 2652 } |
| 2653 | |
| 2654 // Is the gap between reading the finger and doing the CAS too long? | |
| 2655 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 342 | 2656 if (res == finger) { |
| 2657 // we succeeded | |
| 2658 | |
| 2659 // notice that _finger == end cannot be guaranteed here since, | |
| 2660 // someone else might have moved the finger even further | |
|
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2661 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 2662 |
|
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2663 if (verbose_low()) { |
| 342 | 2664 gclog_or_tty->print_cr("[%d] we were successful with region = " |
| 2665 PTR_FORMAT, task_num, curr_region); | |
|
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2666 } |
| 342 | 2667 |
| 2668 if (limit > bottom) { | |
|
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2669 if (verbose_low()) { |
| 342 | 2670 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
| 2671 "returning it ", task_num, curr_region); | |
|
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2672 } |
| 342 | 2673 return curr_region; |
| 2674 } else { | |
|
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2675 assert(limit == bottom, |
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|
2676 "the region limit should be at bottom"); |
|
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|
2677 if (verbose_low()) { |
| 342 | 2678 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
| 2679 "returning NULL", task_num, curr_region); | |
|
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2680 } |
| 342 | 2681 // we return NULL and the caller should try calling |
| 2682 // claim_region() again. | |
| 2683 return NULL; | |
| 2684 } | |
| 2685 } else { | |
|
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2686 assert(_finger > finger, "the finger should have moved forward"); |
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2687 if (verbose_low()) { |
| 342 | 2688 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
| 2689 "global finger = "PTR_FORMAT", " | |
| 2690 "our finger = "PTR_FORMAT, | |
| 2691 task_num, _finger, finger); | |
|
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2692 } |
| 342 | 2693 |
| 2694 // read it again | |
| 2695 finger = _finger; | |
| 2696 } | |
| 2697 } | |
| 2698 | |
| 2699 return NULL; | |
| 2700 } | |
| 2701 | |
|
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2702 #ifndef PRODUCT |
|
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2703 enum VerifyNoCSetOopsPhase { |
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2704 VerifyNoCSetOopsStack, |
|
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2705 VerifyNoCSetOopsQueues, |
|
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2706 VerifyNoCSetOopsSATBCompleted, |
|
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2707 VerifyNoCSetOopsSATBThread |
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2708 }; |
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2709 |
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2710 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2711 private: |
|
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2712 G1CollectedHeap* _g1h; |
|
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2713 VerifyNoCSetOopsPhase _phase; |
|
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2714 int _info; |
|
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2715 |
|
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2716 const char* phase_str() { |
|
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2717 switch (_phase) { |
|
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2718 case VerifyNoCSetOopsStack: return "Stack"; |
|
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2719 case VerifyNoCSetOopsQueues: return "Queue"; |
|
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2720 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
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2721 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
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2722 default: ShouldNotReachHere(); |
|
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2723 } |
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2724 return NULL; |
|
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|
2725 } |
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2726 |
|
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|
2727 void do_object_work(oop obj) { |
|
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2728 guarantee(!_g1h->obj_in_cs(obj), |
|
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2729 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
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2730 (void*) obj, phase_str(), _info)); |
|
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|
2731 } |
|
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|
2732 |
|
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|
2733 public: |
|
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|
2734 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
|
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2735 |
|
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|
2736 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
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|
2737 _phase = phase; |
|
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|
2738 _info = info; |
|
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|
2739 } |
|
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|
2740 |
|
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|
2741 virtual void do_oop(oop* p) { |
|
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2742 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2743 do_object_work(obj); |
|
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2744 } |
|
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2745 |
|
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|
2746 virtual void do_oop(narrowOop* p) { |
|
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2747 // We should not come across narrow oops while scanning marking |
|
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2748 // stacks and SATB buffers. |
|
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|
2749 ShouldNotReachHere(); |
|
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|
2750 } |
|
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2751 |
|
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|
2752 virtual void do_object(oop obj) { |
|
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2753 do_object_work(obj); |
|
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|
2754 } |
|
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|
2755 }; |
|
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2756 |
|
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2757 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
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2758 bool verify_enqueued_buffers, |
|
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2759 bool verify_thread_buffers, |
|
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2760 bool verify_fingers) { |
|
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2761 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
|
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2762 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
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2763 return; |
| 342 | 2764 } |
|
1835
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2765 |
|
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|
2766 VerifyNoCSetOopsClosure cl; |
|
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2767 |
|
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|
2768 if (verify_stacks) { |
|
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|
2769 // Verify entries on the global mark stack |
|
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|
2770 cl.set_phase(VerifyNoCSetOopsStack); |
|
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|
2771 _markStack.oops_do(&cl); |
|
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|
2772 |
|
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|
2773 // Verify entries on the task queues |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
2774 for (int i = 0; i < (int) _max_task_num; i += 1) { |
|
2ace1c4ee8da
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parents:
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diff
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|
2775 cl.set_phase(VerifyNoCSetOopsQueues, i); |
|
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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|
2776 OopTaskQueue* queue = _task_queues->queue(i); |
|
2ace1c4ee8da
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parents:
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|
2777 queue->oops_do(&cl); |
|
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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|
2778 } |
|
2ace1c4ee8da
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parents:
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diff
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|
2779 } |
|
2ace1c4ee8da
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parents:
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diff
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|
2780 |
|
2ace1c4ee8da
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parents:
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diff
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|
2781 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
2782 |
|
2ace1c4ee8da
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parents:
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diff
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|
2783 // Verify entries on the enqueued SATB buffers |
|
2ace1c4ee8da
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diff
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|
2784 if (verify_enqueued_buffers) { |
|
2ace1c4ee8da
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tonyp
parents:
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|
2785 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
2ace1c4ee8da
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parents:
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|
2786 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
2ace1c4ee8da
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parents:
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|
2787 } |
|
2ace1c4ee8da
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|
2788 |
|
2ace1c4ee8da
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diff
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|
2789 // Verify entries on the per-thread SATB buffers |
|
2ace1c4ee8da
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|
2790 if (verify_thread_buffers) { |
|
2ace1c4ee8da
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|
2791 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
2ace1c4ee8da
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|
2792 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
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|
2793 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
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|
2794 |
|
4787
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|
2795 if (verify_fingers) { |
|
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tonyp
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|
2796 // Verify the global finger |
|
2ace1c4ee8da
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|
2797 HeapWord* global_finger = finger(); |
|
2ace1c4ee8da
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|
2798 if (global_finger != NULL && global_finger < _heap_end) { |
|
2ace1c4ee8da
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parents:
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|
2799 // The global finger always points to a heap region boundary. We |
|
2ace1c4ee8da
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|
2800 // use heap_region_containing_raw() to get the containing region |
|
2ace1c4ee8da
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|
2801 // given that the global finger could be pointing to a free region |
|
2ace1c4ee8da
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|
2802 // which subsequently becomes continues humongous. If that |
|
2ace1c4ee8da
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|
2803 // happens, heap_region_containing() will return the bottom of the |
|
2ace1c4ee8da
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|
2804 // corresponding starts humongous region and the check below will |
|
2ace1c4ee8da
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parents:
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diff
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|
2805 // not hold any more. |
|
2ace1c4ee8da
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parents:
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|
2806 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
|
2ace1c4ee8da
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parents:
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|
2807 guarantee(global_finger == global_hr->bottom(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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|
2808 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
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|
2809 global_finger, HR_FORMAT_PARAMS(global_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
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|
2810 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
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|
2811 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
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|
2812 // Verify the task fingers |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
2813 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
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|
2814 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2815 CMTask* task = _tasks[i]; |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
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|
2816 HeapWord* task_finger = task->finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
2817 if (task_finger != NULL && task_finger < _heap_end) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
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|
2818 // See above note on the global finger verification. |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
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|
2819 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
|
2ace1c4ee8da
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parents:
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diff
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|
2820 guarantee(task_finger == task_hr->bottom() || |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
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|
2821 !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
|
2822 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
2823 task_finger, HR_FORMAT_PARAMS(task_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
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|
2824 } |
|
2ace1c4ee8da
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parents:
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|
2825 } |
|
2ace1c4ee8da
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parents:
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diff
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|
2826 } |
| 342 | 2827 } |
|
4787
2ace1c4ee8da
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parents:
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|
2828 #endif // PRODUCT |
| 342 | 2829 |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2830 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
| 342 | 2831 _markStack.setEmpty(); |
| 2832 _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
|
2833 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
|
2834 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
|
2835 } else { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2836 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
|
2837 } |
| 342 | 2838 _finger = _heap_start; |
| 2839 | |
| 2840 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 2841 OopTaskQueue* queue = _task_queues->queue(i); | |
| 2842 queue->set_empty(); | |
| 2843 } | |
| 2844 } | |
| 2845 | |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2846 // Aggregate the counting data that was constructed concurrently |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2847 // with marking. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2848 class AggregateCountDataHRClosure: public HeapRegionClosure { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2849 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2850 BitMap* _cm_card_bm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2851 size_t _max_task_num; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2852 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2853 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2854 AggregateCountDataHRClosure(ConcurrentMark *cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2855 BitMap* cm_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2856 size_t max_task_num) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2857 _cm(cm), _cm_card_bm(cm_card_bm), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2858 _max_task_num(max_task_num) { } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2859 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2860 bool is_card_aligned(HeapWord* p) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2861 return ((uintptr_t(p) & (CardTableModRefBS::card_size - 1)) == 0); |
|
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 bool doHeapRegion(HeapRegion* hr) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2865 if (hr->continuesHumongous()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2866 // 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
|
2867 // associated "starts humongous" region is processed. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2868 // Note that we cannot rely on their associated |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2869 // "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
|
2870 // 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
|
2871 // iteration, a "continues humongous" region might be visited |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2872 // before its associated "starts humongous". |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2873 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2874 } |
|
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 HeapWord* start = hr->bottom(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2877 HeapWord* limit = hr->next_top_at_mark_start(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2878 HeapWord* end = hr->end(); |
|
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 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
|
2881 err_msg("Preconditions not met - " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2882 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2883 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2884 start, limit, hr->top(), hr->end())); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2885 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2886 assert(hr->next_marked_bytes() == 0, "Precondition"); |
|
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 (start == limit) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2889 // 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
|
2890 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2891 } |
|
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 assert(is_card_aligned(start), "sanity"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2894 assert(is_card_aligned(end), "sanity"); |
|
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 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
|
2897 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
|
2898 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
|
2899 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2900 // 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
|
2901 // limit so that we get the card spanning ntams. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2902 if (!is_card_aligned(limit)) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2903 limit_idx += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2904 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2905 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2906 assert(limit_idx <= end_idx, "or else use atomics"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2907 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2908 // 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
|
2909 uint hrs_index = hr->hrs_index(); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2910 size_t marked_bytes = 0; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2911 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2912 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
|
2913 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
|
2914 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
|
2915 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2916 // 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
|
2917 // add it to the running total for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2918 marked_bytes += marked_bytes_array[hrs_index]; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2919 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2920 // Now union the bitmaps[0,max_task_num)[start_idx..limit_idx) |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2921 // into the global card bitmap. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2922 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2923 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2924 while (scan_idx < limit_idx) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2925 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
|
2926 _cm_card_bm->set_bit(scan_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2927 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2928 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2929 // BitMap::get_next_one_offset() can handle the case when |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2930 // 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
|
2931 // parameter. If does, however, have an early exit if |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2932 // 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
|
2933 // passed in for left offset here. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2934 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2935 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2936 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2937 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2938 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2939 // Update the marked bytes for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2940 hr->add_to_marked_bytes(marked_bytes); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2941 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2942 // Next heap region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2943 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2944 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2945 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2946 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2947 class G1AggregateCountDataTask: public AbstractGangTask { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2948 protected: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2949 G1CollectedHeap* _g1h; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2950 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2951 BitMap* _cm_card_bm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2952 size_t _max_task_num; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2953 int _active_workers; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2954 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2955 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2956 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2957 ConcurrentMark* cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2958 BitMap* cm_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2959 size_t max_task_num, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2960 int n_workers) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2961 AbstractGangTask("Count Aggregation"), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2962 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2963 _max_task_num(max_task_num), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2964 _active_workers(n_workers) { } |
|
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 void work(uint worker_id) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2967 AggregateCountDataHRClosure cl(_cm, _cm_card_bm, _max_task_num); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2968 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2969 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2970 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2971 _active_workers, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2972 HeapRegion::AggregateCountClaimValue); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2973 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2974 _g1h->heap_region_iterate(&cl); |
|
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 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2977 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2978 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2979 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2980 void ConcurrentMark::aggregate_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2981 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2982 _g1h->workers()->active_workers() : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2983 1); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2984 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2985 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2986 _max_task_num, n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2987 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2988 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2989 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2990 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2991 _g1h->set_par_threads(n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2992 _g1h->workers()->run_task(&g1_par_agg_task); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2993 _g1h->set_par_threads(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2994 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2995 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2996 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2997 _g1h->reset_heap_region_claim_values(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2998 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2999 g1_par_agg_task.work(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3000 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3001 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3002 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3003 // 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
|
3004 void ConcurrentMark::clear_all_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3005 // 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
|
3006 // liveness count aggregation (during remark) and the |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3007 // final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3008 _card_bm.clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3009 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3010 // 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
|
3011 // of the final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3012 _region_bm.clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3013 |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3014 uint max_regions = _g1h->max_regions(); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3015 assert(_max_task_num != 0, "unitialized"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3016 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3017 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
|
3018 BitMap* task_card_bm = count_card_bitmap_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3019 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3020 |
|
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3021 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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3022 assert(marked_bytes_array != NULL, "uninitialized"); |
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3023 |
|
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3024 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
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3025 task_card_bm->clear(); |
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3026 } |
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3027 } |
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3028 |
| 342 | 3029 void ConcurrentMark::print_stats() { |
| 3030 if (verbose_stats()) { | |
| 3031 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3032 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3033 _tasks[i]->print_stats(); | |
| 3034 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3035 } | |
| 3036 } | |
| 3037 } | |
| 3038 | |
| 3039 // abandon current marking iteration due to a Full GC | |
| 3040 void ConcurrentMark::abort() { | |
| 3041 // Clear all marks to force marking thread to do nothing | |
| 3042 _nextMarkBitMap->clearAll(); | |
|
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3043 // Clear the liveness counting data |
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3044 clear_all_count_data(); |
| 342 | 3045 // Empty mark stack |
| 3046 clear_marking_state(); | |
|
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3047 for (int i = 0; i < (int)_max_task_num; ++i) { |
| 342 | 3048 _tasks[i]->clear_region_fields(); |
|
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3049 } |
| 342 | 3050 _has_aborted = true; |
| 3051 | |
| 3052 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3053 satb_mq_set.abandon_partial_marking(); | |
|
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3054 // This can be called either during or outside marking, we'll read |
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3055 // the expected_active value from the SATB queue set. |
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3056 satb_mq_set.set_active_all_threads( |
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3057 false, /* new active value */ |
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|
3058 satb_mq_set.is_active() /* expected_active */); |
| 342 | 3059 } |
| 3060 | |
| 3061 static void print_ms_time_info(const char* prefix, const char* name, | |
| 3062 NumberSeq& ns) { | |
| 3063 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3064 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3065 if (ns.num() > 0) { | |
| 3066 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3067 prefix, ns.sd(), ns.maximum()); | |
| 3068 } | |
| 3069 } | |
| 3070 | |
| 3071 void ConcurrentMark::print_summary_info() { | |
| 3072 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3073 print_ms_time_info(" ", "init marks", _init_times); | |
| 3074 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3075 { | |
| 3076 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3077 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3078 | |
| 3079 } | |
| 3080 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3081 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3082 _total_counting_time, | |
| 3083 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3084 (double)_cleanup_times.num() | |
| 3085 : 0.0)); | |
| 3086 if (G1ScrubRemSets) { | |
| 3087 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3088 _total_rs_scrub_time, | |
| 3089 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3090 (double)_cleanup_times.num() | |
| 3091 : 0.0)); | |
| 3092 } | |
| 3093 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3094 (_init_times.sum() + _remark_times.sum() + | |
| 3095 _cleanup_times.sum())/1000.0); | |
| 3096 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
|
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3097 "(%8.2f s marking).", |
| 342 | 3098 cmThread()->vtime_accum(), |
|
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3099 cmThread()->vtime_mark_accum()); |
| 342 | 3100 } |
| 3101 | |
| 1019 | 3102 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
| 3103 _parallel_workers->print_worker_threads_on(st); | |
| 3104 } | |
| 3105 | |
| 342 | 3106 // We take a break if someone is trying to stop the world. |
|
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3107 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 342 | 3108 if (should_yield()) { |
|
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3109 if (worker_id == 0) { |
| 342 | 3110 _g1h->g1_policy()->record_concurrent_pause(); |
|
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|
3111 } |
| 342 | 3112 cmThread()->yield(); |
| 3113 return true; | |
| 3114 } else { | |
| 3115 return false; | |
| 3116 } | |
| 3117 } | |
| 3118 | |
| 3119 bool ConcurrentMark::should_yield() { | |
| 3120 return cmThread()->should_yield(); | |
| 3121 } | |
| 3122 | |
| 3123 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 3124 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 3125 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 3126 } | |
| 3127 | |
| 3128 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 3129 void* last) { | |
|
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3130 return containing_card_is_marked(start) && |
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3131 containing_card_is_marked(last); |
| 342 | 3132 } |
| 3133 | |
| 3134 #ifndef PRODUCT | |
| 3135 // for debugging purposes | |
| 3136 void ConcurrentMark::print_finger() { | |
| 3137 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
| 3138 _heap_start, _heap_end, _finger); | |
| 3139 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 3140 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
| 3141 } | |
| 3142 gclog_or_tty->print_cr(""); | |
| 3143 } | |
| 3144 #endif | |
| 3145 | |
| 3771 | 3146 void CMTask::scan_object(oop obj) { |
| 3147 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3148 | |
| 3149 if (_cm->verbose_high()) { | |
| 3150 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
| 3151 _task_id, (void*) obj); | |
| 3152 } | |
| 3153 | |
| 3154 size_t obj_size = obj->size(); | |
| 3155 _words_scanned += obj_size; | |
| 3156 | |
| 3157 obj->oop_iterate(_cm_oop_closure); | |
| 3158 statsOnly( ++_objs_scanned ); | |
| 3159 check_limits(); | |
| 3160 } | |
| 3161 | |
| 342 | 3162 // Closure for iteration over bitmaps |
| 3163 class CMBitMapClosure : public BitMapClosure { | |
| 3164 private: | |
| 3165 // the bitmap that is being iterated over | |
| 3166 CMBitMap* _nextMarkBitMap; | |
| 3167 ConcurrentMark* _cm; | |
| 3168 CMTask* _task; | |
| 3169 | |
| 3170 public: | |
|
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3171 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3172 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
| 342 | 3173 |
| 3174 bool do_bit(size_t offset) { | |
| 3175 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
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3176 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3177 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3178 |
|
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3179 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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3180 assert(addr >= _task->finger(), "invariant"); |
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3181 |
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3182 // We move that task's local finger along. |
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3183 _task->move_finger_to(addr); |
| 342 | 3184 |
| 3185 _task->scan_object(oop(addr)); | |
| 3186 // we only partially drain the local queue and global stack | |
| 3187 _task->drain_local_queue(true); | |
| 3188 _task->drain_global_stack(true); | |
| 3189 | |
| 3190 // if the has_aborted flag has been raised, we need to bail out of | |
| 3191 // the iteration | |
| 3192 return !_task->has_aborted(); | |
| 3193 } | |
| 3194 }; | |
| 3195 | |
| 3196 // Closure for iterating over objects, currently only used for | |
| 3197 // processing SATB buffers. | |
| 3198 class CMObjectClosure : public ObjectClosure { | |
| 3199 private: | |
| 3200 CMTask* _task; | |
| 3201 | |
| 3202 public: | |
| 3203 void do_object(oop obj) { | |
| 3204 _task->deal_with_reference(obj); | |
| 3205 } | |
| 3206 | |
| 3207 CMObjectClosure(CMTask* task) : _task(task) { } | |
| 3208 }; | |
| 3209 | |
| 3771 | 3210 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 3211 ConcurrentMark* cm, | |
| 3212 CMTask* task) | |
| 3213 : _g1h(g1h), _cm(cm), _task(task) { | |
| 3214 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 3215 | |
| 3216 if (G1UseConcMarkReferenceProcessing) { | |
|
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|
3217 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 3218 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 3219 } |
| 3771 | 3220 } |
| 342 | 3221 |
| 3222 void CMTask::setup_for_region(HeapRegion* hr) { | |
|
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3223 // Separated the asserts so that we know which one fires. |
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3224 assert(hr != NULL, |
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3225 "claim_region() should have filtered out continues humongous regions"); |
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3226 assert(!hr->continuesHumongous(), |
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|
3227 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 3228 |
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|
3229 if (_cm->verbose_low()) { |
| 342 | 3230 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
| 3231 _task_id, hr); | |
|
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|
3232 } |
| 342 | 3233 |
| 3234 _curr_region = hr; | |
| 3235 _finger = hr->bottom(); | |
| 3236 update_region_limit(); | |
| 3237 } | |
| 3238 | |
| 3239 void CMTask::update_region_limit() { | |
| 3240 HeapRegion* hr = _curr_region; | |
| 3241 HeapWord* bottom = hr->bottom(); | |
| 3242 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 3243 | |
| 3244 if (limit == bottom) { | |
|
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|
3245 if (_cm->verbose_low()) { |
| 342 | 3246 gclog_or_tty->print_cr("[%d] found an empty region " |
| 3247 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 3248 _task_id, bottom, limit); | |
|
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|
3249 } |
| 342 | 3250 // The region was collected underneath our feet. |
| 3251 // We set the finger to bottom to ensure that the bitmap | |
| 3252 // iteration that will follow this will not do anything. | |
| 3253 // (this is not a condition that holds when we set the region up, | |
| 3254 // as the region is not supposed to be empty in the first place) | |
| 3255 _finger = bottom; | |
| 3256 } else if (limit >= _region_limit) { | |
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|
3257 assert(limit >= _finger, "peace of mind"); |
| 342 | 3258 } else { |
|
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|
3259 assert(limit < _region_limit, "only way to get here"); |
| 342 | 3260 // This can happen under some pretty unusual circumstances. An |
| 3261 // evacuation pause empties the region underneath our feet (NTAMS | |
| 3262 // at bottom). We then do some allocation in the region (NTAMS | |
| 3263 // stays at bottom), followed by the region being used as a GC | |
| 3264 // alloc region (NTAMS will move to top() and the objects | |
| 3265 // originally below it will be grayed). All objects now marked in | |
| 3266 // the region are explicitly grayed, if below the global finger, | |
| 3267 // and we do not need in fact to scan anything else. So, we simply | |
| 3268 // set _finger to be limit to ensure that the bitmap iteration | |
| 3269 // doesn't do anything. | |
| 3270 _finger = limit; | |
| 3271 } | |
| 3272 | |
| 3273 _region_limit = limit; | |
| 3274 } | |
| 3275 | |
| 3276 void CMTask::giveup_current_region() { | |
|
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3277 assert(_curr_region != NULL, "invariant"); |
|
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|
3278 if (_cm->verbose_low()) { |
| 342 | 3279 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
| 3280 _task_id, _curr_region); | |
|
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|
3281 } |
| 342 | 3282 clear_region_fields(); |
| 3283 } | |
| 3284 | |
| 3285 void CMTask::clear_region_fields() { | |
| 3286 // Values for these three fields that indicate that we're not | |
| 3287 // holding on to a region. | |
| 3288 _curr_region = NULL; | |
| 3289 _finger = NULL; | |
| 3290 _region_limit = NULL; | |
| 3291 } | |
| 3292 | |
| 3771 | 3293 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 3294 if (cm_oop_closure == NULL) { | |
| 3295 assert(_cm_oop_closure != NULL, "invariant"); | |
| 3296 } else { | |
| 3297 assert(_cm_oop_closure == NULL, "invariant"); | |
| 3298 } | |
| 3299 _cm_oop_closure = cm_oop_closure; | |
| 3300 } | |
| 3301 | |
| 342 | 3302 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
|
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3303 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 3304 |
|
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|
3305 if (_cm->verbose_low()) { |
| 342 | 3306 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
|
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|
3307 } |
| 342 | 3308 |
| 3309 _nextMarkBitMap = nextMarkBitMap; | |
| 3310 clear_region_fields(); | |
| 3311 | |
| 3312 _calls = 0; | |
| 3313 _elapsed_time_ms = 0.0; | |
| 3314 _termination_time_ms = 0.0; | |
| 3315 _termination_start_time_ms = 0.0; | |
| 3316 | |
| 3317 #if _MARKING_STATS_ | |
| 3318 _local_pushes = 0; | |
| 3319 _local_pops = 0; | |
| 3320 _local_max_size = 0; | |
| 3321 _objs_scanned = 0; | |
| 3322 _global_pushes = 0; | |
| 3323 _global_pops = 0; | |
| 3324 _global_max_size = 0; | |
| 3325 _global_transfers_to = 0; | |
| 3326 _global_transfers_from = 0; | |
| 3327 _regions_claimed = 0; | |
| 3328 _objs_found_on_bitmap = 0; | |
| 3329 _satb_buffers_processed = 0; | |
| 3330 _steal_attempts = 0; | |
| 3331 _steals = 0; | |
| 3332 _aborted = 0; | |
| 3333 _aborted_overflow = 0; | |
| 3334 _aborted_cm_aborted = 0; | |
| 3335 _aborted_yield = 0; | |
| 3336 _aborted_timed_out = 0; | |
| 3337 _aborted_satb = 0; | |
| 3338 _aborted_termination = 0; | |
| 3339 #endif // _MARKING_STATS_ | |
| 3340 } | |
| 3341 | |
| 3342 bool CMTask::should_exit_termination() { | |
| 3343 regular_clock_call(); | |
| 3344 // This is called when we are in the termination protocol. We should | |
| 3345 // quit if, for some reason, this task wants to abort or the global | |
| 3346 // stack is not empty (this means that we can get work from it). | |
| 3347 return !_cm->mark_stack_empty() || has_aborted(); | |
| 3348 } | |
| 3349 | |
| 3350 void CMTask::reached_limit() { | |
|
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3351 assert(_words_scanned >= _words_scanned_limit || |
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3352 _refs_reached >= _refs_reached_limit , |
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3353 "shouldn't have been called otherwise"); |
| 342 | 3354 regular_clock_call(); |
| 3355 } | |
| 3356 | |
| 3357 void CMTask::regular_clock_call() { | |
|
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3358 if (has_aborted()) return; |
| 342 | 3359 |
| 3360 // First, we need to recalculate the words scanned and refs reached | |
| 3361 // limits for the next clock call. | |
| 3362 recalculate_limits(); | |
| 3363 | |
| 3364 // During the regular clock call we do the following | |
| 3365 | |
| 3366 // (1) If an overflow has been flagged, then we abort. | |
| 3367 if (_cm->has_overflown()) { | |
| 3368 set_has_aborted(); | |
| 3369 return; | |
| 3370 } | |
| 3371 | |
| 3372 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 3373 // to check anything else. The other steps are only needed during | |
| 3374 // the concurrent marking phase. | |
|
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3375 if (!concurrent()) return; |
| 342 | 3376 |
| 3377 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 3378 if (_cm->has_aborted()) { | |
| 3379 set_has_aborted(); | |
| 3380 statsOnly( ++_aborted_cm_aborted ); | |
| 3381 return; | |
| 3382 } | |
| 3383 | |
| 3384 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 3385 | |
| 3386 // (3) If marking stats are enabled, then we update the step history. | |
| 3387 #if _MARKING_STATS_ | |
|
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3388 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 3389 ++_clock_due_to_scanning; |
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3390 } |
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3391 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 3392 ++_clock_due_to_marking; |
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3393 } |
| 342 | 3394 |
| 3395 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 3396 _interval_start_time_ms = curr_time_ms; | |
| 3397 _all_clock_intervals_ms.add(last_interval_ms); | |
| 3398 | |
| 3399 if (_cm->verbose_medium()) { | |
|
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3400 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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3401 "scanned = %d%s, refs reached = %d%s", |
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3402 _task_id, last_interval_ms, |
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3403 _words_scanned, |
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3404 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3405 _refs_reached, |
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3406 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 3407 } |
| 3408 #endif // _MARKING_STATS_ | |
| 3409 | |
| 3410 // (4) We check whether we should yield. If we have to, then we abort. | |
| 3411 if (_cm->should_yield()) { | |
| 3412 // We should yield. To do this we abort the task. The caller is | |
| 3413 // responsible for yielding. | |
| 3414 set_has_aborted(); | |
| 3415 statsOnly( ++_aborted_yield ); | |
| 3416 return; | |
| 3417 } | |
| 3418 | |
| 3419 // (5) We check whether we've reached our time quota. If we have, | |
| 3420 // then we abort. | |
| 3421 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 3422 if (elapsed_time_ms > _time_target_ms) { | |
| 3423 set_has_aborted(); | |
|
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3424 _has_timed_out = true; |
| 342 | 3425 statsOnly( ++_aborted_timed_out ); |
| 3426 return; | |
| 3427 } | |
| 3428 | |
| 3429 // (6) Finally, we check whether there are enough completed STAB | |
| 3430 // buffers available for processing. If there are, we abort. | |
| 3431 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3432 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3433 if (_cm->verbose_low()) { |
| 342 | 3434 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
| 3435 _task_id); | |
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3436 } |
| 342 | 3437 // we do need to process SATB buffers, we'll abort and restart |
| 3438 // the marking task to do so | |
| 3439 set_has_aborted(); | |
| 3440 statsOnly( ++_aborted_satb ); | |
| 3441 return; | |
| 3442 } | |
| 3443 } | |
| 3444 | |
| 3445 void CMTask::recalculate_limits() { | |
| 3446 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 3447 _words_scanned_limit = _real_words_scanned_limit; | |
| 3448 | |
| 3449 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 3450 _refs_reached_limit = _real_refs_reached_limit; | |
| 3451 } | |
| 3452 | |
| 3453 void CMTask::decrease_limits() { | |
| 3454 // This is called when we believe that we're going to do an infrequent | |
| 3455 // operation which will increase the per byte scanned cost (i.e. move | |
| 3456 // entries to/from the global stack). It basically tries to decrease the | |
| 3457 // scanning limit so that the clock is called earlier. | |
| 3458 | |
|
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3459 if (_cm->verbose_medium()) { |
| 342 | 3460 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
|
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3461 } |
| 342 | 3462 |
| 3463 _words_scanned_limit = _real_words_scanned_limit - | |
| 3464 3 * words_scanned_period / 4; | |
| 3465 _refs_reached_limit = _real_refs_reached_limit - | |
| 3466 3 * refs_reached_period / 4; | |
| 3467 } | |
| 3468 | |
| 3469 void CMTask::move_entries_to_global_stack() { | |
| 3470 // local array where we'll store the entries that will be popped | |
| 3471 // from the local queue | |
| 3472 oop buffer[global_stack_transfer_size]; | |
| 3473 | |
| 3474 int n = 0; | |
| 3475 oop obj; | |
| 3476 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 3477 buffer[n] = obj; | |
| 3478 ++n; | |
| 3479 } | |
| 3480 | |
| 3481 if (n > 0) { | |
| 3482 // we popped at least one entry from the local queue | |
| 3483 | |
| 3484 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 3485 | |
| 3486 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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3487 if (_cm->verbose_low()) { |
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3488 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
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3489 _task_id); |
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3490 } |
| 342 | 3491 set_has_aborted(); |
| 3492 } else { | |
| 3493 // the transfer was successful | |
| 3494 | |
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3495 if (_cm->verbose_medium()) { |
| 342 | 3496 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
| 3497 _task_id, n); | |
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3498 } |
| 342 | 3499 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3500 if (tmp_size > _global_max_size) { |
| 342 | 3501 _global_max_size = tmp_size; |
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3502 } |
| 342 | 3503 _global_pushes += n ); |
| 3504 } | |
| 3505 } | |
| 3506 | |
| 3507 // this operation was quite expensive, so decrease the limits | |
| 3508 decrease_limits(); | |
| 3509 } | |
| 3510 | |
| 3511 void CMTask::get_entries_from_global_stack() { | |
| 3512 // local array where we'll store the entries that will be popped | |
| 3513 // from the global stack. | |
| 3514 oop buffer[global_stack_transfer_size]; | |
| 3515 int n; | |
| 3516 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
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3517 assert(n <= global_stack_transfer_size, |
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3518 "we should not pop more than the given limit"); |
| 342 | 3519 if (n > 0) { |
| 3520 // yes, we did actually pop at least one entry | |
| 3521 | |
| 3522 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3523 if (_cm->verbose_medium()) { |
| 342 | 3524 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
| 3525 _task_id, n); | |
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3526 } |
| 342 | 3527 for (int i = 0; i < n; ++i) { |
| 3528 bool success = _task_queue->push(buffer[i]); | |
| 3529 // We only call this when the local queue is empty or under a | |
| 3530 // given target limit. So, we do not expect this push to fail. | |
|
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3531 assert(success, "invariant"); |
| 342 | 3532 } |
| 3533 | |
| 3534 statsOnly( int tmp_size = _task_queue->size(); | |
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3535 if (tmp_size > _local_max_size) { |
| 342 | 3536 _local_max_size = tmp_size; |
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3537 } |
| 342 | 3538 _local_pushes += n ); |
| 3539 } | |
| 3540 | |
| 3541 // this operation was quite expensive, so decrease the limits | |
| 3542 decrease_limits(); | |
| 3543 } | |
| 3544 | |
| 3545 void CMTask::drain_local_queue(bool partially) { | |
|
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3546 if (has_aborted()) return; |
| 342 | 3547 |
| 3548 // Decide what the target size is, depending whether we're going to | |
| 3549 // drain it partially (so that other tasks can steal if they run out | |
| 3550 // of things to do) or totally (at the very end). | |
| 3551 size_t target_size; | |
|
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3552 if (partially) { |
| 342 | 3553 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
|
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3554 } else { |
| 342 | 3555 target_size = 0; |
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3556 } |
| 342 | 3557 |
| 3558 if (_task_queue->size() > target_size) { | |
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3559 if (_cm->verbose_high()) { |
| 342 | 3560 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
| 3561 _task_id, target_size); | |
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3562 } |
| 342 | 3563 |
| 3564 oop obj; | |
| 3565 bool ret = _task_queue->pop_local(obj); | |
| 3566 while (ret) { | |
| 3567 statsOnly( ++_local_pops ); | |
| 3568 | |
|
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3569 if (_cm->verbose_high()) { |
| 342 | 3570 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
| 3571 (void*) obj); | |
|
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3572 } |
| 342 | 3573 |
|
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3574 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 3575 assert(!_g1h->is_on_master_free_list( |
| 2152 | 3576 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 3577 |
| 3578 scan_object(obj); | |
| 3579 | |
|
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3580 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 3581 ret = false; |
|
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3582 } else { |
| 342 | 3583 ret = _task_queue->pop_local(obj); |
|
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3584 } |
| 342 | 3585 } |
| 3586 | |
|
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3587 if (_cm->verbose_high()) { |
| 342 | 3588 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
| 3589 _task_id, _task_queue->size()); | |
|
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3590 } |
| 342 | 3591 } |
| 3592 } | |
| 3593 | |
| 3594 void CMTask::drain_global_stack(bool partially) { | |
|
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3595 if (has_aborted()) return; |
| 342 | 3596 |
| 3597 // We have a policy to drain the local queue before we attempt to | |
| 3598 // drain the global stack. | |
|
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3599 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 3600 |
| 3601 // Decide what the target size is, depending whether we're going to | |
| 3602 // drain it partially (so that other tasks can steal if they run out | |
| 3603 // of things to do) or totally (at the very end). Notice that, | |
| 3604 // because we move entries from the global stack in chunks or | |
| 3605 // because another task might be doing the same, we might in fact | |
| 3606 // drop below the target. But, this is not a problem. | |
| 3607 size_t target_size; | |
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3608 if (partially) { |
| 342 | 3609 target_size = _cm->partial_mark_stack_size_target(); |
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3610 } else { |
| 342 | 3611 target_size = 0; |
|
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3612 } |
| 342 | 3613 |
| 3614 if (_cm->mark_stack_size() > target_size) { | |
|
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3615 if (_cm->verbose_low()) { |
| 342 | 3616 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
| 3617 _task_id, target_size); | |
|
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3618 } |
| 342 | 3619 |
| 3620 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 3621 get_entries_from_global_stack(); | |
| 3622 drain_local_queue(partially); | |
| 3623 } | |
| 3624 | |
|
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3625 if (_cm->verbose_low()) { |
| 342 | 3626 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
| 3627 _task_id, _cm->mark_stack_size()); | |
|
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3628 } |
| 342 | 3629 } |
| 3630 } | |
| 3631 | |
| 3632 // SATB Queue has several assumptions on whether to call the par or | |
| 3633 // non-par versions of the methods. this is why some of the code is | |
| 3634 // replicated. We should really get rid of the single-threaded version | |
| 3635 // of the code to simplify things. | |
| 3636 void CMTask::drain_satb_buffers() { | |
|
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3637 if (has_aborted()) return; |
| 342 | 3638 |
| 3639 // We set this so that the regular clock knows that we're in the | |
| 3640 // middle of draining buffers and doesn't set the abort flag when it | |
| 3641 // notices that SATB buffers are available for draining. It'd be | |
| 3642 // very counter productive if it did that. :-) | |
| 3643 _draining_satb_buffers = true; | |
| 3644 | |
| 3645 CMObjectClosure oc(this); | |
| 3646 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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3647 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3648 satb_mq_set.set_par_closure(_task_id, &oc); |
|
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3649 } else { |
| 342 | 3650 satb_mq_set.set_closure(&oc); |
|
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3651 } |
| 342 | 3652 |
| 3653 // This keeps claiming and applying the closure to completed buffers | |
| 3654 // until we run out of buffers or we need to abort. | |
|
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3655 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3656 while (!has_aborted() && |
| 3657 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
|
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3658 if (_cm->verbose_medium()) { |
| 342 | 3659 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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3660 } |
| 342 | 3661 statsOnly( ++_satb_buffers_processed ); |
| 3662 regular_clock_call(); | |
| 3663 } | |
| 3664 } else { | |
| 3665 while (!has_aborted() && | |
| 3666 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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3667 if (_cm->verbose_medium()) { |
| 342 | 3668 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
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3669 } |
| 342 | 3670 statsOnly( ++_satb_buffers_processed ); |
| 3671 regular_clock_call(); | |
| 3672 } | |
| 3673 } | |
| 3674 | |
| 3675 if (!concurrent() && !has_aborted()) { | |
| 3676 // We should only do this during remark. | |
|
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3677 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3678 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
|
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3679 } else { |
| 342 | 3680 satb_mq_set.iterate_closure_all_threads(); |
|
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3681 } |
| 342 | 3682 } |
| 3683 | |
| 3684 _draining_satb_buffers = false; | |
| 3685 | |
|
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3686 assert(has_aborted() || |
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3687 concurrent() || |
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3688 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 3689 |
|
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3690 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3691 satb_mq_set.set_par_closure(_task_id, NULL); |
|
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3692 } else { |
| 342 | 3693 satb_mq_set.set_closure(NULL); |
|
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3694 } |
| 342 | 3695 |
| 3696 // again, this was a potentially expensive operation, decrease the | |
| 3697 // limits to get the regular clock call early | |
| 3698 decrease_limits(); | |
| 3699 } | |
| 3700 | |
| 3701 void CMTask::print_stats() { | |
| 3702 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
| 3703 _task_id, _calls); | |
| 3704 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
| 3705 _elapsed_time_ms, _termination_time_ms); | |
| 3706 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 3707 _step_times_ms.num(), _step_times_ms.avg(), | |
| 3708 _step_times_ms.sd()); | |
| 3709 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 3710 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 3711 | |
| 3712 #if _MARKING_STATS_ | |
| 3713 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 3714 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 3715 _all_clock_intervals_ms.sd()); | |
| 3716 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 3717 _all_clock_intervals_ms.maximum(), | |
| 3718 _all_clock_intervals_ms.sum()); | |
| 3719 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 3720 _clock_due_to_scanning, _clock_due_to_marking); | |
| 3721 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 3722 _objs_scanned, _objs_found_on_bitmap); | |
| 3723 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 3724 _local_pushes, _local_pops, _local_max_size); | |
| 3725 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 3726 _global_pushes, _global_pops, _global_max_size); | |
| 3727 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 3728 _global_transfers_to,_global_transfers_from); | |
|
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3729 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
| 342 | 3730 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
| 3731 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 3732 _steal_attempts, _steals); | |
| 3733 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 3734 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 3735 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 3736 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 3737 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 3738 #endif // _MARKING_STATS_ | |
| 3739 } | |
| 3740 | |
| 3741 /***************************************************************************** | |
| 3742 | |
| 3743 The do_marking_step(time_target_ms) method is the building block | |
| 3744 of the parallel marking framework. It can be called in parallel | |
| 3745 with other invocations of do_marking_step() on different tasks | |
| 3746 (but only one per task, obviously) and concurrently with the | |
| 3747 mutator threads, or during remark, hence it eliminates the need | |
| 3748 for two versions of the code. When called during remark, it will | |
| 3749 pick up from where the task left off during the concurrent marking | |
| 3750 phase. Interestingly, tasks are also claimable during evacuation | |
| 3751 pauses too, since do_marking_step() ensures that it aborts before | |
| 3752 it needs to yield. | |
| 3753 | |
| 3754 The data structures that is uses to do marking work are the | |
| 3755 following: | |
| 3756 | |
| 3757 (1) Marking Bitmap. If there are gray objects that appear only | |
| 3758 on the bitmap (this happens either when dealing with an overflow | |
| 3759 or when the initial marking phase has simply marked the roots | |
| 3760 and didn't push them on the stack), then tasks claim heap | |
| 3761 regions whose bitmap they then scan to find gray objects. A | |
| 3762 global finger indicates where the end of the last claimed region | |
| 3763 is. A local finger indicates how far into the region a task has | |
| 3764 scanned. The two fingers are used to determine how to gray an | |
| 3765 object (i.e. whether simply marking it is OK, as it will be | |
| 3766 visited by a task in the future, or whether it needs to be also | |
| 3767 pushed on a stack). | |
| 3768 | |
| 3769 (2) Local Queue. The local queue of the task which is accessed | |
| 3770 reasonably efficiently by the task. Other tasks can steal from | |
| 3771 it when they run out of work. Throughout the marking phase, a | |
| 3772 task attempts to keep its local queue short but not totally | |
| 3773 empty, so that entries are available for stealing by other | |
| 3774 tasks. Only when there is no more work, a task will totally | |
| 3775 drain its local queue. | |
| 3776 | |
| 3777 (3) Global Mark Stack. This handles local queue overflow. During | |
| 3778 marking only sets of entries are moved between it and the local | |
| 3779 queues, as access to it requires a mutex and more fine-grain | |
| 3780 interaction with it which might cause contention. If it | |
| 3781 overflows, then the marking phase should restart and iterate | |
| 3782 over the bitmap to identify gray objects. Throughout the marking | |
| 3783 phase, tasks attempt to keep the global mark stack at a small | |
| 3784 length but not totally empty, so that entries are available for | |
| 3785 popping by other tasks. Only when there is no more work, tasks | |
| 3786 will totally drain the global mark stack. | |
| 3787 | |
|
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3788 (4) SATB Buffer Queue. This is where completed SATB buffers are |
| 342 | 3789 made available. Buffers are regularly removed from this queue |
| 3790 and scanned for roots, so that the queue doesn't get too | |
| 3791 long. During remark, all completed buffers are processed, as | |
| 3792 well as the filled in parts of any uncompleted buffers. | |
| 3793 | |
| 3794 The do_marking_step() method tries to abort when the time target | |
| 3795 has been reached. There are a few other cases when the | |
| 3796 do_marking_step() method also aborts: | |
| 3797 | |
| 3798 (1) When the marking phase has been aborted (after a Full GC). | |
| 3799 | |
|
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3800 (2) When a global overflow (on the global stack) has been |
|
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3801 triggered. Before the task aborts, it will actually sync up with |
|
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3802 the other tasks to ensure that all the marking data structures |
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3803 (local queues, stacks, fingers etc.) are re-initialised so that |
|
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3804 when do_marking_step() completes, the marking phase can |
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3805 immediately restart. |
| 342 | 3806 |
| 3807 (3) When enough completed SATB buffers are available. The | |
| 3808 do_marking_step() method only tries to drain SATB buffers right | |
| 3809 at the beginning. So, if enough buffers are available, the | |
| 3810 marking step aborts and the SATB buffers are processed at | |
| 3811 the beginning of the next invocation. | |
| 3812 | |
| 3813 (4) To yield. when we have to yield then we abort and yield | |
| 3814 right at the end of do_marking_step(). This saves us from a lot | |
| 3815 of hassle as, by yielding we might allow a Full GC. If this | |
| 3816 happens then objects will be compacted underneath our feet, the | |
| 3817 heap might shrink, etc. We save checking for this by just | |
| 3818 aborting and doing the yield right at the end. | |
| 3819 | |
| 3820 From the above it follows that the do_marking_step() method should | |
| 3821 be called in a loop (or, otherwise, regularly) until it completes. | |
| 3822 | |
| 3823 If a marking step completes without its has_aborted() flag being | |
| 3824 true, it means it has completed the current marking phase (and | |
| 3825 also all other marking tasks have done so and have all synced up). | |
| 3826 | |
| 3827 A method called regular_clock_call() is invoked "regularly" (in | |
| 3828 sub ms intervals) throughout marking. It is this clock method that | |
| 3829 checks all the abort conditions which were mentioned above and | |
| 3830 decides when the task should abort. A work-based scheme is used to | |
| 3831 trigger this clock method: when the number of object words the | |
| 3832 marking phase has scanned or the number of references the marking | |
| 3833 phase has visited reach a given limit. Additional invocations to | |
| 3834 the method clock have been planted in a few other strategic places | |
| 3835 too. The initial reason for the clock method was to avoid calling | |
| 3836 vtime too regularly, as it is quite expensive. So, once it was in | |
| 3837 place, it was natural to piggy-back all the other conditions on it | |
| 3838 too and not constantly check them throughout the code. | |
| 3839 | |
| 3840 *****************************************************************************/ | |
| 3841 | |
|
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3842 void CMTask::do_marking_step(double time_target_ms, |
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3843 bool do_stealing, |
|
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3844 bool do_termination) { |
|
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3845 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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3846 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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3847 |
| 342 | 3848 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
|
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3849 assert(_task_queues != NULL, "invariant"); |
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3850 assert(_task_queue != NULL, "invariant"); |
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3851 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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3852 |
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3853 assert(!_claimed, |
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3854 "only one thread should claim this task at any one time"); |
| 342 | 3855 |
| 3856 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 3857 // possible for two threads to set the _claimed flag at the same | |
| 3858 // time. But it is only for debugging purposes anyway and it will | |
| 3859 // catch most problems. | |
| 3860 _claimed = true; | |
| 3861 | |
| 3862 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 3863 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 3864 | |
| 3865 double diff_prediction_ms = | |
| 3866 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 3867 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 3868 | |
| 3869 // set up the variables that are used in the work-based scheme to | |
| 3870 // call the regular clock method | |
| 3871 _words_scanned = 0; | |
| 3872 _refs_reached = 0; | |
| 3873 recalculate_limits(); | |
| 3874 | |
| 3875 // clear all flags | |
| 3876 clear_has_aborted(); | |
|
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3877 _has_timed_out = false; |
| 342 | 3878 _draining_satb_buffers = false; |
| 3879 | |
| 3880 ++_calls; | |
| 3881 | |
|
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3882 if (_cm->verbose_low()) { |
| 342 | 3883 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
| 3884 "target = %1.2lfms >>>>>>>>>>", | |
| 3885 _task_id, _calls, _time_target_ms); | |
|
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3886 } |
| 342 | 3887 |
| 3888 // Set up the bitmap and oop closures. Anything that uses them is | |
| 3889 // eventually called from this method, so it is OK to allocate these | |
| 3890 // statically. | |
| 3891 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 3892 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 3893 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 3894 |
| 3895 if (_cm->has_overflown()) { | |
|
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3896 // This can happen if the mark stack overflows during a GC pause |
|
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3897 // and this task, after a yield point, restarts. We have to abort |
|
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3898 // as we need to get into the overflow protocol which happens |
|
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3899 // right at the end of this task. |
| 342 | 3900 set_has_aborted(); |
| 3901 } | |
| 3902 | |
| 3903 // First drain any available SATB buffers. After this, we will not | |
| 3904 // look at SATB buffers before the next invocation of this method. | |
| 3905 // If enough completed SATB buffers are queued up, the regular clock | |
| 3906 // will abort this task so that it restarts. | |
| 3907 drain_satb_buffers(); | |
| 3908 // ...then partially drain the local queue and the global stack | |
| 3909 drain_local_queue(true); | |
| 3910 drain_global_stack(true); | |
| 3911 | |
| 3912 do { | |
| 3913 if (!has_aborted() && _curr_region != NULL) { | |
| 3914 // This means that we're already holding on to a region. | |
|
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3915 assert(_finger != NULL, "if region is not NULL, then the finger " |
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3916 "should not be NULL either"); |
| 342 | 3917 |
| 3918 // We might have restarted this task after an evacuation pause | |
| 3919 // which might have evacuated the region we're holding on to | |
| 3920 // underneath our feet. Let's read its limit again to make sure | |
| 3921 // that we do not iterate over a region of the heap that | |
| 3922 // contains garbage (update_region_limit() will also move | |
| 3923 // _finger to the start of the region if it is found empty). | |
| 3924 update_region_limit(); | |
| 3925 // We will start from _finger not from the start of the region, | |
| 3926 // as we might be restarting this task after aborting half-way | |
| 3927 // through scanning this region. In this case, _finger points to | |
| 3928 // the address where we last found a marked object. If this is a | |
| 3929 // fresh region, _finger points to start(). | |
| 3930 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 3931 | |
|
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|
3932 if (_cm->verbose_low()) { |
| 342 | 3933 gclog_or_tty->print_cr("[%d] we're scanning part " |
| 3934 "["PTR_FORMAT", "PTR_FORMAT") " | |
| 3935 "of region "PTR_FORMAT, | |
| 3936 _task_id, _finger, _region_limit, _curr_region); | |
|
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|
3937 } |
| 342 | 3938 |
| 3939 // Let's iterate over the bitmap of the part of the | |
| 3940 // region that is left. | |
|
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3941 if (mr.is_empty() || _nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
| 342 | 3942 // We successfully completed iterating over the region. Now, |
| 3943 // let's give up the region. | |
| 3944 giveup_current_region(); | |
| 3945 regular_clock_call(); | |
| 3946 } else { | |
|
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3947 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 3948 // The only way to abort the bitmap iteration is to return |
| 3949 // false from the do_bit() method. However, inside the | |
| 3950 // do_bit() method we move the _finger to point to the | |
| 3951 // object currently being looked at. So, if we bail out, we | |
| 3952 // have definitely set _finger to something non-null. | |
|
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3953 assert(_finger != NULL, "invariant"); |
| 342 | 3954 |
| 3955 // Region iteration was actually aborted. So now _finger | |
| 3956 // points to the address of the object we last scanned. If we | |
| 3957 // leave it there, when we restart this task, we will rescan | |
| 3958 // the object. It is easy to avoid this. We move the finger by | |
| 3959 // enough to point to the next possible object header (the | |
| 3960 // bitmap knows by how much we need to move it as it knows its | |
| 3961 // granularity). | |
|
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3962 assert(_finger < _region_limit, "invariant"); |
|
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6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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|
3963 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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|
3964 // Check if bitmap iteration was aborted while scanning the last object |
|
3f0549ed0c98
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|
3965 if (new_finger >= _region_limit) { |
|
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|
3966 giveup_current_region(); |
|
1314
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|
3967 } else { |
|
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|
3968 move_finger_to(new_finger); |
|
1314
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|
3969 } |
| 342 | 3970 } |
| 3971 } | |
| 3972 // At this point we have either completed iterating over the | |
| 3973 // region we were holding on to, or we have aborted. | |
| 3974 | |
| 3975 // We then partially drain the local queue and the global stack. | |
| 3976 // (Do we really need this?) | |
| 3977 drain_local_queue(true); | |
| 3978 drain_global_stack(true); | |
| 3979 | |
| 3980 // Read the note on the claim_region() method on why it might | |
| 3981 // return NULL with potentially more regions available for | |
| 3982 // claiming and why we have to check out_of_regions() to determine | |
| 3983 // whether we're done or not. | |
| 3984 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 3985 // We are going to try to claim a new region. We should have | |
| 3986 // given up on the previous one. | |
|
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|
3987 // Separated the asserts so that we know which one fires. |
|
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|
3988 assert(_curr_region == NULL, "invariant"); |
|
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|
3989 assert(_finger == NULL, "invariant"); |
|
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|
3990 assert(_region_limit == NULL, "invariant"); |
|
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|
3991 if (_cm->verbose_low()) { |
| 342 | 3992 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
|
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|
3993 } |
| 342 | 3994 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
| 3995 if (claimed_region != NULL) { | |
| 3996 // Yes, we managed to claim one | |
| 3997 statsOnly( ++_regions_claimed ); | |
| 3998 | |
|
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|
3999 if (_cm->verbose_low()) { |
| 342 | 4000 gclog_or_tty->print_cr("[%d] we successfully claimed " |
| 4001 "region "PTR_FORMAT, | |
| 4002 _task_id, claimed_region); | |
|
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|
4003 } |
| 342 | 4004 |
| 4005 setup_for_region(claimed_region); | |
|
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|
4006 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 4007 } |
| 4008 // It is important to call the regular clock here. It might take | |
| 4009 // a while to claim a region if, for example, we hit a large | |
| 4010 // block of empty regions. So we need to call the regular clock | |
| 4011 // method once round the loop to make sure it's called | |
| 4012 // frequently enough. | |
| 4013 regular_clock_call(); | |
| 4014 } | |
| 4015 | |
| 4016 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
4017 assert(_cm->out_of_regions(), |
|
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|
4018 "at this point we should be out of regions"); |
| 342 | 4019 } |
| 4020 } while ( _curr_region != NULL && !has_aborted()); | |
| 4021 | |
| 4022 if (!has_aborted()) { | |
| 4023 // We cannot check whether the global stack is empty, since other | |
|
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|
4024 // tasks might be pushing objects to it concurrently. |
|
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|
4025 assert(_cm->out_of_regions(), |
|
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|
4026 "at this point we should be out of regions"); |
| 342 | 4027 |
|
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|
4028 if (_cm->verbose_low()) { |
| 342 | 4029 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
|
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|
4030 } |
| 342 | 4031 |
| 4032 // Try to reduce the number of available SATB buffers so that | |
| 4033 // remark has less work to do. | |
| 4034 drain_satb_buffers(); | |
| 4035 } | |
| 4036 | |
| 4037 // Since we've done everything else, we can now totally drain the | |
| 4038 // local queue and global stack. | |
| 4039 drain_local_queue(false); | |
| 4040 drain_global_stack(false); | |
| 4041 | |
| 4042 // Attempt at work stealing from other task's queues. | |
|
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|
4043 if (do_stealing && !has_aborted()) { |
| 342 | 4044 // We have not aborted. This means that we have finished all that |
| 4045 // we could. Let's try to do some stealing... | |
| 4046 | |
| 4047 // We cannot check whether the global stack is empty, since other | |
|
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|
4048 // tasks might be pushing objects to it concurrently. |
|
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|
4049 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
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|
4050 "only way to reach here"); |
| 342 | 4051 |
|
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|
4052 if (_cm->verbose_low()) { |
| 342 | 4053 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
|
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|
4054 } |
| 342 | 4055 |
| 4056 while (!has_aborted()) { | |
| 4057 oop obj; | |
| 4058 statsOnly( ++_steal_attempts ); | |
| 4059 | |
| 4060 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
|
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|
4061 if (_cm->verbose_medium()) { |
| 342 | 4062 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
| 4063 _task_id, (void*) obj); | |
|
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|
4064 } |
| 342 | 4065 |
| 4066 statsOnly( ++_steals ); | |
| 4067 | |
|
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|
4068 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
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|
4069 "any stolen object should be marked"); |
| 342 | 4070 scan_object(obj); |
| 4071 | |
| 4072 // And since we're towards the end, let's totally drain the | |
| 4073 // local queue and global stack. | |
| 4074 drain_local_queue(false); | |
| 4075 drain_global_stack(false); | |
| 4076 } else { | |
| 4077 break; | |
| 4078 } | |
| 4079 } | |
| 4080 } | |
| 4081 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4082 // If we are about to wrap up and go into termination, check if we |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4083 // should raise the overflow flag. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4084 if (do_termination && !has_aborted()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4085 if (_cm->force_overflow()->should_force()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4086 _cm->set_has_overflown(); |
|
cd8e33b2a8ad
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changeset
|
4087 regular_clock_call(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4088 } |
|
cd8e33b2a8ad
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|
4089 } |
|
cd8e33b2a8ad
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|
4090 |
| 342 | 4091 // We still haven't aborted. Now, let's try to get into the |
| 4092 // termination protocol. | |
|
2174
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|
4093 if (do_termination && !has_aborted()) { |
| 342 | 4094 // We cannot check whether the global stack is empty, since other |
|
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|
4095 // tasks might be concurrently pushing objects on it. |
|
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|
4096 // Separated the asserts so that we know which one fires. |
|
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|
4097 assert(_cm->out_of_regions(), "only way to reach here"); |
|
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|
4098 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 4099 |
|
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|
4100 if (_cm->verbose_low()) { |
| 342 | 4101 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
|
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|
4102 } |
| 342 | 4103 |
| 4104 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4105 // The CMTask class also extends the TerminatorTerminator class, | |
| 4106 // hence its should_exit_termination() method will also decide | |
| 4107 // whether to exit the termination protocol or not. | |
| 4108 bool finished = _cm->terminator()->offer_termination(this); | |
| 4109 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
| 4110 _termination_time_ms += | |
| 4111 termination_end_time_ms - _termination_start_time_ms; | |
| 4112 | |
| 4113 if (finished) { | |
| 4114 // We're all done. | |
| 4115 | |
| 4116 if (_task_id == 0) { | |
| 4117 // let's allow task 0 to do this | |
| 4118 if (concurrent()) { | |
|
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|
4119 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 4120 // we need to set this to false before the next |
| 4121 // safepoint. This way we ensure that the marking phase | |
| 4122 // doesn't observe any more heap expansions. | |
| 4123 _cm->clear_concurrent_marking_in_progress(); | |
| 4124 } | |
| 4125 } | |
| 4126 | |
| 4127 // We can now guarantee that the global stack is empty, since | |
|
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|
4128 // all other tasks have finished. We separated the guarantees so |
|
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|
4129 // that, if a condition is false, we can immediately find out |
|
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|
4130 // which one. |
|
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|
4131 guarantee(_cm->out_of_regions(), "only way to reach here"); |
|
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|
4132 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
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|
4133 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
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|
4134 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
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|
4135 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
| 342 | 4136 |
|
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|
4137 if (_cm->verbose_low()) { |
| 342 | 4138 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
|
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|
4139 } |
| 342 | 4140 } else { |
| 4141 // Apparently there's more work to do. Let's abort this task. It | |
| 4142 // will restart it and we can hopefully find more things to do. | |
| 4143 | |
|
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|
4144 if (_cm->verbose_low()) { |
|
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|
4145 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
|
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|
4146 _task_id); |
|
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|
4147 } |
| 342 | 4148 |
| 4149 set_has_aborted(); | |
| 4150 statsOnly( ++_aborted_termination ); | |
| 4151 } | |
| 4152 } | |
| 4153 | |
| 4154 // Mainly for debugging purposes to make sure that a pointer to the | |
| 4155 // closure which was statically allocated in this frame doesn't | |
| 4156 // escape it by accident. | |
| 3771 | 4157 set_cm_oop_closure(NULL); |
| 342 | 4158 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 4159 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 4160 // Update the step history. | |
| 4161 _step_times_ms.add(elapsed_time_ms); | |
| 4162 | |
| 4163 if (has_aborted()) { | |
| 4164 // The task was aborted for some reason. | |
| 4165 | |
| 4166 statsOnly( ++_aborted ); | |
| 4167 | |
|
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|
4168 if (_has_timed_out) { |
| 342 | 4169 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 4170 // Keep statistics of how well we did with respect to hitting | |
| 4171 // our target only if we actually timed out (if we aborted for | |
| 4172 // other reasons, then the results might get skewed). | |
| 4173 _marking_step_diffs_ms.add(diff_ms); | |
| 4174 } | |
| 4175 | |
| 4176 if (_cm->has_overflown()) { | |
| 4177 // This is the interesting one. We aborted because a global | |
| 4178 // overflow was raised. This means we have to restart the | |
| 4179 // marking phase and start iterating over regions. However, in | |
| 4180 // order to do this we have to make sure that all tasks stop | |
| 4181 // what they are doing and re-initialise in a safe manner. We | |
| 4182 // will achieve this with the use of two barrier sync points. | |
| 4183 | |
|
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|
4184 if (_cm->verbose_low()) { |
| 342 | 4185 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
|
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|
4186 } |
| 342 | 4187 |
| 4188 _cm->enter_first_sync_barrier(_task_id); | |
| 4189 // When we exit this sync barrier we know that all tasks have | |
| 4190 // stopped doing marking work. So, it's now safe to | |
| 4191 // re-initialise our data structures. At the end of this method, | |
| 4192 // task 0 will clear the global data structures. | |
| 4193 | |
| 4194 statsOnly( ++_aborted_overflow ); | |
| 4195 | |
| 4196 // We clear the local state of this task... | |
| 4197 clear_region_fields(); | |
| 4198 | |
| 4199 // ...and enter the second barrier. | |
| 4200 _cm->enter_second_sync_barrier(_task_id); | |
| 4201 // At this point everything has bee re-initialised and we're | |
| 4202 // ready to restart. | |
| 4203 } | |
| 4204 | |
| 4205 if (_cm->verbose_low()) { | |
| 4206 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
| 4207 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4208 _task_id, _time_target_ms, elapsed_time_ms); | |
|
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|
4209 if (_cm->has_aborted()) { |
| 342 | 4210 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
| 4211 _task_id); | |
|
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|
4212 } |
| 342 | 4213 } |
| 4214 } else { | |
|
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|
4215 if (_cm->verbose_low()) { |
| 342 | 4216 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 4217 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4218 _task_id, _time_target_ms, elapsed_time_ms); | |
|
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|
4219 } |
| 342 | 4220 } |
| 4221 | |
| 4222 _claimed = false; | |
| 4223 } | |
| 4224 | |
| 4225 CMTask::CMTask(int task_id, | |
| 4226 ConcurrentMark* cm, | |
|
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changeset
|
4227 size_t* marked_bytes, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4228 BitMap* card_bm, |
| 342 | 4229 CMTaskQueue* task_queue, |
| 4230 CMTaskQueueSet* task_queues) | |
| 4231 : _g1h(G1CollectedHeap::heap()), | |
| 4232 _task_id(task_id), _cm(cm), | |
| 4233 _claimed(false), | |
| 4234 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 4235 _task_queue(task_queue), | |
| 4236 _task_queues(task_queues), | |
| 3771 | 4237 _cm_oop_closure(NULL), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
4238 _marked_bytes_array(marked_bytes), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4239 _card_bm(card_bm) { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4240 guarantee(task_queue != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4241 guarantee(task_queues != NULL, "invariant"); |
| 342 | 4242 |
| 4243 statsOnly( _clock_due_to_scanning = 0; | |
| 4244 _clock_due_to_marking = 0 ); | |
| 4245 | |
| 4246 _marking_step_diffs_ms.add(0.5); | |
| 4247 } | |
|
2435
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4248 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4249 // These are formatting macros that are used below to ensure |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4250 // consistent formatting. The *_H_* versions are used to format the |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4251 // header for a particular value and they should be kept consistent |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4252 // with the corresponding macro. Also note that most of the macros add |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4253 // the necessary white space (as a prefix) which makes them a bit |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4254 // easier to compose. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4255 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4256 // All the output lines are prefixed with this string to be able to |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4257 // identify them easily in a large log file. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
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changeset
|
4258 #define G1PPRL_LINE_PREFIX "###" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4259 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4260 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4261 #ifdef _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4262 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4263 #else // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4264 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4265 #endif // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4266 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4267 // For per-region info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4268 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
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changeset
|
4269 #define G1PPRL_TYPE_H_FORMAT " %4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4270 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4271 #define G1PPRL_BYTE_H_FORMAT " %9s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4272 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4273 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4274 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4275 // For summary info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4276 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
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changeset
|
4277 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4278 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4279 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4280 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4281 G1PrintRegionLivenessInfoClosure:: |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4282 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4283 : _out(out), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4284 _total_used_bytes(0), _total_capacity_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4285 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4286 _hum_used_bytes(0), _hum_capacity_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4287 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4288 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4289 MemRegion g1_committed = g1h->g1_committed(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4290 MemRegion g1_reserved = g1h->g1_reserved(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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changeset
|
4291 double now = os::elapsedTime(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4292 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4293 // Print the header of the output. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4294 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4295 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4296 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4297 G1PPRL_SUM_ADDR_FORMAT("committed") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4298 G1PPRL_SUM_ADDR_FORMAT("reserved") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4299 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4300 g1_committed.start(), g1_committed.end(), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4301 g1_reserved.start(), g1_reserved.end(), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4302 HeapRegion::GrainBytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4303 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4304 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4305 G1PPRL_TYPE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4306 G1PPRL_ADDR_BASE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4307 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4308 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4309 G1PPRL_BYTE_H_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4310 G1PPRL_DOUBLE_H_FORMAT, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4311 "type", "address-range", |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4312 "used", "prev-live", "next-live", "gc-eff"); |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4313 _out->print_cr(G1PPRL_LINE_PREFIX |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4314 G1PPRL_TYPE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4315 G1PPRL_ADDR_BASE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4316 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4317 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4318 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4319 G1PPRL_DOUBLE_H_FORMAT, |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4320 "", "", |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4321 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4322 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4323 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4324 // It takes as a parameter a reference to one of the _hum_* fields, it |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4325 // deduces the corresponding value for a region in a humongous region |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4326 // series (either the region size, or what's left if the _hum_* field |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4327 // is < the region size), and updates the _hum_* field accordingly. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4328 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4329 size_t bytes = 0; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4330 // The > 0 check is to deal with the prev and next live bytes which |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4331 // could be 0. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4332 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4333 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4334 *hum_bytes -= bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4335 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4336 return bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4337 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4338 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4339 // It deduces the values for a region in a humongous region series |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4340 // from the _hum_* fields and updates those accordingly. It assumes |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4341 // that that _hum_* fields have already been set up from the "starts |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4342 // humongous" region and we visit the regions in address order. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4343 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4344 size_t* capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4345 size_t* prev_live_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4346 size_t* next_live_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4347 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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|
4348 *used_bytes = get_hum_bytes(&_hum_used_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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|
4349 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4350 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4351 *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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|
4352 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4353 |
|
371bbc844bf1
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changeset
|
4354 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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changeset
|
4355 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
|
4356 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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|
4357 HeapWord* end = r->end(); |
|
371bbc844bf1
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|
4358 size_t capacity_bytes = r->capacity(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4359 size_t used_bytes = r->used(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4360 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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|
4361 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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changeset
|
4362 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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changeset
|
4363 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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diff
changeset
|
4364 type = "FREE"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4365 } else if (r->is_survivor()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4366 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4367 } else if (r->is_young()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4368 type = "EDEN"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4369 } else if (r->startsHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4370 type = "HUMS"; |
|
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diff
changeset
|
4371 |
|
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changeset
|
4372 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
|
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|
4373 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
|
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|
4374 "they should have been zeroed after the last time we used them"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4375 // Set up the _hum_* fields. |
|
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|
4376 _hum_capacity_bytes = capacity_bytes; |
|
371bbc844bf1
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|
4377 _hum_used_bytes = used_bytes; |
|
371bbc844bf1
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|
4378 _hum_prev_live_bytes = prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4379 _hum_next_live_bytes = next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4380 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
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|
4381 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
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changeset
|
4382 end = bottom + HeapRegion::GrainWords; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4383 } else if (r->continuesHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4384 type = "HUMC"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4385 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4386 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4387 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4388 } else { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4389 type = "OLD"; |
|
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
|
4390 } |
|
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
|
4391 |
|
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
|
4392 _total_used_bytes += used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4393 _total_capacity_bytes += capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4394 _total_prev_live_bytes += prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4395 _total_next_live_bytes += next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4396 |
|
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
|
4397 // Print a line for this particular region. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4398 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4399 G1PPRL_TYPE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4400 G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4401 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4402 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4403 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4404 G1PPRL_DOUBLE_FORMAT, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4405 type, bottom, end, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4406 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4407 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4408 return false; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4409 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4410 |
|
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 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4412 // Print the footer of the output. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4413 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4414 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4415 " SUMMARY" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4416 G1PPRL_SUM_MB_FORMAT("capacity") |
|
371bbc844bf1
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diff
changeset
|
4417 G1PPRL_SUM_MB_PERC_FORMAT("used") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4418 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4419 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4420 bytes_to_mb(_total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4421 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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2369
diff
changeset
|
4422 perc(_total_used_bytes, _total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4423 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
|
4424 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
|
4425 bytes_to_mb(_total_next_live_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4426 perc(_total_next_live_bytes, _total_capacity_bytes)); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4427 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
4428 } |