Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 4828:851b58c26def
7130334: G1: Change comments and error messages that refer to CMS in g1/concurrentMark.cpp/hpp
Summary: Removed references to CMS in the concurrentMark.cpp/hpp files.
Reviewed-by: tonyp, jmasa, johnc
| author | brutisso |
|---|---|
| date | Mon, 16 Jan 2012 11:21:21 +0100 |
| parents | 2e966d967c5c |
| children | 0b3d1ec6eaee |
| rev | line source |
|---|---|
| 342 | 1 /* |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4735
diff
changeset
|
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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1547
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1547
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1547
diff
changeset
|
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" | |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3867
diff
changeset
|
31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
| 3771 | 32 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
34 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 35 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 36 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2037
diff
changeset
|
37 #include "gc_implementation/shared/vmGCOperations.hpp" |
| 1972 | 38 #include "memory/genOopClosures.inline.hpp" |
| 39 #include "memory/referencePolicy.hpp" | |
| 40 #include "memory/resourceArea.hpp" | |
| 41 #include "oops/oop.inline.hpp" | |
| 42 #include "runtime/handles.inline.hpp" | |
| 43 #include "runtime/java.hpp" | |
| 342 | 44 |
|
4828
851b58c26def
7130334: G1: Change comments and error messages that refer to CMS in g1/concurrentMark.cpp/hpp
brutisso
parents:
4827
diff
changeset
|
45 // Concurrent marking bit map wrapper |
| 342 | 46 |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
47 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
| 342 | 48 _bm((uintptr_t*)NULL,0), |
| 49 _shifter(shifter) { | |
| 50 _bmStartWord = (HeapWord*)(rs.base()); | |
| 51 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
| 52 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
| 53 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
| 54 | |
|
4828
851b58c26def
7130334: G1: Change comments and error messages that refer to CMS in g1/concurrentMark.cpp/hpp
brutisso
parents:
4827
diff
changeset
|
55 guarantee(brs.is_reserved(), "couldn't allocate concurrent marking bit map"); |
| 342 | 56 // For now we'll just commit all of the bit map up fromt. |
| 57 // Later on we'll try to be more parsimonious with swap. | |
| 58 guarantee(_virtual_space.initialize(brs, brs.size()), | |
|
4828
851b58c26def
7130334: G1: Change comments and error messages that refer to CMS in g1/concurrentMark.cpp/hpp
brutisso
parents:
4827
diff
changeset
|
59 "couldn't reseve backing store for concurrent marking bit map"); |
| 342 | 60 assert(_virtual_space.committed_size() == brs.size(), |
|
4828
851b58c26def
7130334: G1: Change comments and error messages that refer to CMS in g1/concurrentMark.cpp/hpp
brutisso
parents:
4827
diff
changeset
|
61 "didn't reserve backing store for all of concurrent marking bit map?"); |
| 342 | 62 _bm.set_map((uintptr_t*)_virtual_space.low()); |
| 63 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
| 64 _bmWordSize, "inconsistency in bit map sizing"); | |
| 65 _bm.set_size(_bmWordSize >> _shifter); | |
| 66 } | |
| 67 | |
| 68 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
| 69 HeapWord* limit) const { | |
| 70 // First we must round addr *up* to a possible object boundary. | |
| 71 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
| 72 HeapWordSize << _shifter); | |
| 73 size_t addrOffset = heapWordToOffset(addr); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
74 if (limit == NULL) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
75 limit = _bmStartWord + _bmWordSize; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
76 } |
| 342 | 77 size_t limitOffset = heapWordToOffset(limit); |
| 78 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
| 79 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 80 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 81 assert(nextAddr == limit || isMarked(nextAddr), | |
| 82 "get_next_one postcondition"); | |
| 83 return nextAddr; | |
| 84 } | |
| 85 | |
| 86 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
| 87 HeapWord* limit) const { | |
| 88 size_t addrOffset = heapWordToOffset(addr); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
89 if (limit == NULL) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
90 limit = _bmStartWord + _bmWordSize; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
91 } |
| 342 | 92 size_t limitOffset = heapWordToOffset(limit); |
| 93 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
| 94 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
| 95 assert(nextAddr >= addr, "get_next_one postcondition"); | |
| 96 assert(nextAddr == limit || !isMarked(nextAddr), | |
| 97 "get_next_one postcondition"); | |
| 98 return nextAddr; | |
| 99 } | |
| 100 | |
| 101 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
| 102 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
| 103 return (int) (diff >> _shifter); | |
| 104 } | |
| 105 | |
| 106 void CMBitMapRO::mostly_disjoint_range_union(BitMap* from_bitmap, | |
| 107 size_t from_start_index, | |
| 108 HeapWord* to_start_word, | |
| 109 size_t word_num) { | |
| 110 _bm.mostly_disjoint_range_union(from_bitmap, | |
| 111 from_start_index, | |
| 112 heapWordToOffset(to_start_word), | |
| 113 word_num); | |
| 114 } | |
| 115 | |
| 116 #ifndef PRODUCT | |
| 117 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
| 118 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
|
645
c3a720eefe82
6816308: Changes to allow builds with latest Windows SDK 6.1 on 64bit Windows 2003
kvn
parents:
619
diff
changeset
|
119 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
| 342 | 120 "size inconsistency"); |
| 121 return _bmStartWord == (HeapWord*)(rs.base()) && | |
| 122 _bmWordSize == rs.size()>>LogHeapWordSize; | |
| 123 } | |
| 124 #endif | |
| 125 | |
| 126 void CMBitMap::clearAll() { | |
| 127 _bm.clear(); | |
| 128 return; | |
| 129 } | |
| 130 | |
| 131 void CMBitMap::markRange(MemRegion mr) { | |
| 132 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 133 assert(!mr.is_empty(), "unexpected empty region"); | |
| 134 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 135 ((HeapWord *) mr.end())), | |
| 136 "markRange memory region end is not card aligned"); | |
| 137 // convert address range into offset range | |
| 138 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 139 heapWordToOffset(mr.end()), true); | |
| 140 } | |
| 141 | |
| 142 void CMBitMap::clearRange(MemRegion mr) { | |
| 143 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 144 assert(!mr.is_empty(), "unexpected empty region"); | |
| 145 // convert address range into offset range | |
| 146 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 147 heapWordToOffset(mr.end()), false); | |
| 148 } | |
| 149 | |
| 150 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 151 HeapWord* end_addr) { | |
| 152 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 153 start = MIN2(start, end_addr); | |
| 154 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 155 end = MIN2(end, end_addr); | |
| 156 assert(start <= end, "Consistency check"); | |
| 157 MemRegion mr(start, end); | |
| 158 if (!mr.is_empty()) { | |
| 159 clearRange(mr); | |
| 160 } | |
| 161 return mr; | |
| 162 } | |
| 163 | |
| 164 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 165 _base(NULL), _cm(cm) | |
| 166 #ifdef ASSERT | |
| 167 , _drain_in_progress(false) | |
| 168 , _drain_in_progress_yields(false) | |
| 169 #endif | |
| 170 {} | |
| 171 | |
| 172 void CMMarkStack::allocate(size_t size) { | |
| 173 _base = NEW_C_HEAP_ARRAY(oop, size); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
174 if (_base == NULL) { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
175 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
176 } |
| 342 | 177 _index = 0; |
| 178 _capacity = (jint) size; | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
179 _saved_index = -1; |
| 342 | 180 NOT_PRODUCT(_max_depth = 0); |
| 181 } | |
| 182 | |
| 183 CMMarkStack::~CMMarkStack() { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
184 if (_base != NULL) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
185 FREE_C_HEAP_ARRAY(oop, _base); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
186 } |
| 342 | 187 } |
| 188 | |
| 189 void CMMarkStack::par_push(oop ptr) { | |
| 190 while (true) { | |
| 191 if (isFull()) { | |
| 192 _overflow = true; | |
| 193 return; | |
| 194 } | |
| 195 // Otherwise... | |
| 196 jint index = _index; | |
| 197 jint next_index = index+1; | |
| 198 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 199 if (res == index) { | |
| 200 _base[index] = ptr; | |
| 201 // Note that we don't maintain this atomically. We could, but it | |
| 202 // doesn't seem necessary. | |
| 203 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 204 return; | |
| 205 } | |
| 206 // Otherwise, we need to try again. | |
| 207 } | |
| 208 } | |
| 209 | |
| 210 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 211 while (true) { | |
| 212 if (isFull()) { | |
| 213 _overflow = true; | |
| 214 return; | |
| 215 } | |
| 216 // Otherwise... | |
| 217 jint index = _index; | |
| 218 jint next_index = index + n; | |
| 219 if (next_index > _capacity) { | |
| 220 _overflow = true; | |
| 221 return; | |
| 222 } | |
| 223 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 224 if (res == index) { | |
| 225 for (int i = 0; i < n; i++) { | |
| 226 int ind = index + i; | |
| 227 assert(ind < _capacity, "By overflow test above."); | |
| 228 _base[ind] = ptr_arr[i]; | |
| 229 } | |
| 230 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 231 return; | |
| 232 } | |
| 233 // Otherwise, we need to try again. | |
| 234 } | |
| 235 } | |
| 236 | |
| 237 | |
| 238 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 239 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 240 jint start = _index; | |
| 241 jint next_index = start + n; | |
| 242 if (next_index > _capacity) { | |
| 243 _overflow = true; | |
| 244 return; | |
| 245 } | |
| 246 // Otherwise. | |
| 247 _index = next_index; | |
| 248 for (int i = 0; i < n; i++) { | |
| 249 int ind = start + i; | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
250 assert(ind < _capacity, "By overflow test above."); |
| 342 | 251 _base[ind] = ptr_arr[i]; |
| 252 } | |
| 253 } | |
| 254 | |
| 255 | |
| 256 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 257 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 258 jint index = _index; | |
| 259 if (index == 0) { | |
| 260 *n = 0; | |
| 261 return false; | |
| 262 } else { | |
| 263 int k = MIN2(max, index); | |
| 264 jint new_ind = index - k; | |
| 265 for (int j = 0; j < k; j++) { | |
| 266 ptr_arr[j] = _base[new_ind + j]; | |
| 267 } | |
| 268 _index = new_ind; | |
| 269 *n = k; | |
| 270 return true; | |
| 271 } | |
| 272 } | |
| 273 | |
| 274 CMRegionStack::CMRegionStack() : _base(NULL) {} | |
| 275 | |
| 276 void CMRegionStack::allocate(size_t size) { | |
| 277 _base = NEW_C_HEAP_ARRAY(MemRegion, size); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
278 if (_base == NULL) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
279 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
280 } |
| 342 | 281 _index = 0; |
| 282 _capacity = (jint) size; | |
| 283 } | |
| 284 | |
| 285 CMRegionStack::~CMRegionStack() { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
286 if (_base != NULL) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
287 FREE_C_HEAP_ARRAY(oop, _base); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
288 } |
| 342 | 289 } |
| 290 | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
291 void CMRegionStack::push_lock_free(MemRegion mr) { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
292 guarantee(false, "push_lock_free(): don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
293 |
| 342 | 294 assert(mr.word_size() > 0, "Precondition"); |
| 295 while (true) { | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
296 jint index = _index; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
297 |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
298 if (index >= _capacity) { |
| 342 | 299 _overflow = true; |
| 300 return; | |
| 301 } | |
| 302 // Otherwise... | |
| 303 jint next_index = index+1; | |
| 304 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 305 if (res == index) { | |
| 306 _base[index] = mr; | |
| 307 return; | |
| 308 } | |
| 309 // Otherwise, we need to try again. | |
| 310 } | |
| 311 } | |
| 312 | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
313 // Lock-free pop of the region stack. Called during the concurrent |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
314 // marking / remark phases. Should only be called in tandem with |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
315 // other lock-free pops. |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
316 MemRegion CMRegionStack::pop_lock_free() { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
317 guarantee(false, "pop_lock_free(): don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
318 |
| 342 | 319 while (true) { |
| 320 jint index = _index; | |
| 321 | |
| 322 if (index == 0) { | |
| 323 return MemRegion(); | |
| 324 } | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
325 // Otherwise... |
| 342 | 326 jint next_index = index-1; |
| 327 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 328 if (res == index) { | |
| 329 MemRegion mr = _base[next_index]; | |
| 330 if (mr.start() != NULL) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
331 assert(mr.end() != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
332 assert(mr.word_size() > 0, "invariant"); |
| 342 | 333 return mr; |
| 334 } else { | |
| 335 // that entry was invalidated... let's skip it | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
336 assert(mr.end() == NULL, "invariant"); |
| 342 | 337 } |
| 338 } | |
| 339 // Otherwise, we need to try again. | |
| 340 } | |
| 341 } | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
342 |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
343 #if 0 |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
344 // The routines that manipulate the region stack with a lock are |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
345 // not currently used. They should be retained, however, as a |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
346 // diagnostic aid. |
|
1358
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
347 |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
348 void CMRegionStack::push_with_lock(MemRegion mr) { |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
349 assert(mr.word_size() > 0, "Precondition"); |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
350 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
351 |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
352 if (isFull()) { |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
353 _overflow = true; |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
354 return; |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
355 } |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
356 |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
357 _base[_index] = mr; |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
358 _index += 1; |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
359 } |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
360 |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
361 MemRegion CMRegionStack::pop_with_lock() { |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
362 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
363 |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
364 while (true) { |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
365 if (_index == 0) { |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
366 return MemRegion(); |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
367 } |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
368 _index -= 1; |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
369 |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
370 MemRegion mr = _base[_index]; |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
371 if (mr.start() != NULL) { |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
372 assert(mr.end() != NULL, "invariant"); |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
373 assert(mr.word_size() > 0, "invariant"); |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
374 return mr; |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
375 } else { |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
376 // that entry was invalidated... let's skip it |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
377 assert(mr.end() == NULL, "invariant"); |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
378 } |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
379 } |
|
72f725c5a7be
6940310: G1: MT-unsafe calls to CM::region_stack_push() / CM::region_stack_pop()
tonyp
parents:
1317
diff
changeset
|
380 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
381 #endif |
| 342 | 382 |
| 383 bool CMRegionStack::invalidate_entries_into_cset() { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
384 guarantee(false, "invalidate_entries_into_cset(): don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
385 |
| 342 | 386 bool result = false; |
| 387 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 388 for (int i = 0; i < _oops_do_bound; ++i) { | |
| 389 MemRegion mr = _base[i]; | |
| 390 if (mr.start() != NULL) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
391 assert(mr.end() != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
392 assert(mr.word_size() > 0, "invariant"); |
| 342 | 393 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
394 assert(hr != NULL, "invariant"); |
| 342 | 395 if (hr->in_collection_set()) { |
| 396 // The region points into the collection set | |
| 397 _base[i] = MemRegion(); | |
| 398 result = true; | |
| 399 } | |
| 400 } else { | |
| 401 // that entry was invalidated... let's skip it | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
402 assert(mr.end() == NULL, "invariant"); |
| 342 | 403 } |
| 404 } | |
| 405 return result; | |
| 406 } | |
| 407 | |
| 408 template<class OopClosureClass> | |
| 409 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 410 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 411 || SafepointSynchronize::is_at_safepoint(), | |
| 412 "Drain recursion must be yield-safe."); | |
| 413 bool res = true; | |
| 414 debug_only(_drain_in_progress = true); | |
| 415 debug_only(_drain_in_progress_yields = yield_after); | |
| 416 while (!isEmpty()) { | |
| 417 oop newOop = pop(); | |
| 418 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 419 assert(newOop->is_oop(), "Expected an oop"); | |
| 420 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 421 "only grey objects on this stack"); | |
| 422 newOop->oop_iterate(cl); | |
| 423 if (yield_after && _cm->do_yield_check()) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
424 res = false; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
425 break; |
| 342 | 426 } |
| 427 } | |
| 428 debug_only(_drain_in_progress = false); | |
| 429 return res; | |
| 430 } | |
| 431 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
432 void CMMarkStack::note_start_of_gc() { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
433 assert(_saved_index == -1, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
434 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
435 _saved_index = _index; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
436 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
437 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
438 void CMMarkStack::note_end_of_gc() { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
439 // This is intentionally a guarantee, instead of an assert. If we |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
440 // accidentally add something to the mark stack during GC, it |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
441 // will be a correctness issue so it's better if we crash. we'll |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
442 // only check this once per GC anyway, so it won't be a performance |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
443 // issue in any way. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
444 guarantee(_saved_index == _index, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
445 err_msg("saved index: %d index: %d", _saved_index, _index)); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
446 _saved_index = -1; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
447 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
448 |
| 342 | 449 void CMMarkStack::oops_do(OopClosure* f) { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
450 assert(_saved_index == _index, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
451 err_msg("saved index: %d index: %d", _saved_index, _index)); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
452 for (int i = 0; i < _index; i += 1) { |
| 342 | 453 f->do_oop(&_base[i]); |
| 454 } | |
| 455 } | |
| 456 | |
| 457 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
| 458 return (_g1h->is_obj_ill(obj) | |
| 459 || (_g1h->is_in_permanent(obj) | |
| 460 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
| 461 } | |
| 462 | |
| 463 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 464 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 465 #endif // _MSC_VER | |
| 466 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
467 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
468 return MAX2((n_par_threads + 2) / 4, 1U); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
469 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
470 |
| 342 | 471 ConcurrentMark::ConcurrentMark(ReservedSpace rs, |
| 472 int max_regions) : | |
| 473 _markBitMap1(rs, MinObjAlignment - 1), | |
| 474 _markBitMap2(rs, MinObjAlignment - 1), | |
| 475 | |
| 476 _parallel_marking_threads(0), | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
477 _max_parallel_marking_threads(0), |
| 342 | 478 _sleep_factor(0.0), |
| 479 _marking_task_overhead(1.0), | |
| 480 _cleanup_sleep_factor(0.0), | |
| 481 _cleanup_task_overhead(1.0), | |
| 2152 | 482 _cleanup_list("Cleanup List"), |
| 342 | 483 _region_bm(max_regions, false /* in_resource_area*/), |
| 484 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
| 485 CardTableModRefBS::card_shift, | |
| 486 false /* in_resource_area*/), | |
| 487 _prevMarkBitMap(&_markBitMap1), | |
| 488 _nextMarkBitMap(&_markBitMap2), | |
| 489 _at_least_one_mark_complete(false), | |
| 490 | |
| 491 _markStack(this), | |
| 492 _regionStack(), | |
| 493 // _finger set in set_non_marking_state | |
| 494 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
495 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 496 // _active_tasks set in set_non_marking_state |
| 497 // _tasks set inside the constructor | |
| 498 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
| 499 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
| 500 | |
| 501 _has_overflown(false), | |
| 502 _concurrent(false), | |
|
619
7ea5ca260b28
6814467: G1: small fixes related to concurrent marking verboseness
tonyp
parents:
470
diff
changeset
|
503 _has_aborted(false), |
|
7ea5ca260b28
6814467: G1: small fixes related to concurrent marking verboseness
tonyp
parents:
470
diff
changeset
|
504 _restart_for_overflow(false), |
|
7ea5ca260b28
6814467: G1: small fixes related to concurrent marking verboseness
tonyp
parents:
470
diff
changeset
|
505 _concurrent_marking_in_progress(false), |
|
7ea5ca260b28
6814467: G1: small fixes related to concurrent marking verboseness
tonyp
parents:
470
diff
changeset
|
506 _should_gray_objects(false), |
| 342 | 507 |
| 508 // _verbose_level set below | |
| 509 | |
| 510 _init_times(), | |
| 511 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 512 _cleanup_times(), | |
| 513 _total_counting_time(0.0), | |
| 514 _total_rs_scrub_time(0.0), | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
515 _parallel_workers(NULL) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
516 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
517 if (verbose_level < no_verbose) { |
| 342 | 518 verbose_level = no_verbose; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
519 } |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
520 if (verbose_level > high_verbose) { |
| 342 | 521 verbose_level = high_verbose; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
522 } |
| 342 | 523 _verbose_level = verbose_level; |
| 524 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
525 if (verbose_low()) { |
| 342 | 526 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
| 527 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
528 } |
| 342 | 529 |
| 1284 | 530 _markStack.allocate(MarkStackSize); |
| 751 | 531 _regionStack.allocate(G1MarkRegionStackSize); |
| 342 | 532 |
| 533 // Create & start a ConcurrentMark thread. | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
534 _cmThread = new ConcurrentMarkThread(this); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
535 assert(cmThread() != NULL, "CM Thread should have been created"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
536 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
537 |
| 342 | 538 _g1h = G1CollectedHeap::heap(); |
| 539 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
| 540 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
| 541 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
| 542 | |
| 543 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 544 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 545 |
| 546 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
| 547 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
| 548 | |
| 549 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail | |
| 550 _active_tasks = _max_task_num; | |
| 551 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 552 CMTaskQueue* task_queue = new CMTaskQueue(); | |
| 553 task_queue->initialize(); | |
| 554 _task_queues->register_queue(i, task_queue); | |
| 555 | |
| 556 _tasks[i] = new CMTask(i, this, task_queue, _task_queues); | |
| 557 _accum_task_vtime[i] = 0.0; | |
| 558 } | |
| 559 | |
| 1284 | 560 if (ConcGCThreads > ParallelGCThreads) { |
| 561 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
| 342 | 562 "than ParallelGCThreads."); |
| 563 } | |
| 564 if (ParallelGCThreads == 0) { | |
| 565 // if we are not running with any parallel GC threads we will not | |
| 566 // spawn any marking threads either | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
567 _parallel_marking_threads = 0; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
568 _max_parallel_marking_threads = 0; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
569 _sleep_factor = 0.0; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
570 _marking_task_overhead = 1.0; |
| 342 | 571 } else { |
| 1284 | 572 if (ConcGCThreads > 0) { |
| 573 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
| 342 | 574 // if both are set |
| 575 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
576 _parallel_marking_threads = (uint) ConcGCThreads; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
577 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 578 _sleep_factor = 0.0; |
| 579 _marking_task_overhead = 1.0; | |
| 751 | 580 } else if (G1MarkingOverheadPercent > 0) { |
| 342 | 581 // we will calculate the number of parallel marking threads |
| 582 // based on a target overhead with respect to the soft real-time | |
| 583 // goal | |
| 584 | |
| 751 | 585 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 586 double overall_cm_overhead = |
| 751 | 587 (double) MaxGCPauseMillis * marking_overhead / |
| 588 (double) GCPauseIntervalMillis; | |
| 342 | 589 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 590 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 591 double marking_task_overhead = | |
| 592 overall_cm_overhead / marking_thread_num * | |
| 593 (double) os::processor_count(); | |
| 594 double sleep_factor = | |
| 595 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 596 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
597 _parallel_marking_threads = (uint) marking_thread_num; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
598 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 599 _sleep_factor = sleep_factor; |
| 600 _marking_task_overhead = marking_task_overhead; | |
| 601 } else { | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
602 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
603 _max_parallel_marking_threads = _parallel_marking_threads; |
| 342 | 604 _sleep_factor = 0.0; |
| 605 _marking_task_overhead = 1.0; | |
| 606 } | |
| 607 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
608 if (parallel_marking_threads() > 1) { |
| 342 | 609 _cleanup_task_overhead = 1.0; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
610 } else { |
| 342 | 611 _cleanup_task_overhead = marking_task_overhead(); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
612 } |
| 342 | 613 _cleanup_sleep_factor = |
| 614 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 615 | |
| 616 #if 0 | |
| 617 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 618 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 619 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 620 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 621 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 622 #endif | |
| 623 | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
624 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
625 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
626 _max_parallel_marking_threads, false, true); |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
627 if (_parallel_workers == NULL) { |
| 342 | 628 vm_exit_during_initialization("Failed necessary allocation."); |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
629 } else { |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
630 _parallel_workers->initialize_workers(); |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
631 } |
| 342 | 632 } |
| 633 | |
| 634 // so that the call below can read a sensible value | |
| 635 _heap_start = (HeapWord*) rs.base(); | |
| 636 set_non_marking_state(); | |
| 637 } | |
| 638 | |
| 639 void ConcurrentMark::update_g1_committed(bool force) { | |
| 640 // If concurrent marking is not in progress, then we do not need to | |
| 641 // update _heap_end. This has a subtle and important | |
| 642 // side-effect. Imagine that two evacuation pauses happen between | |
| 643 // marking completion and remark. The first one can grow the | |
| 644 // heap (hence now the finger is below the heap end). Then, the | |
| 645 // second one could unnecessarily push regions on the region | |
| 646 // stack. This causes the invariant that the region stack is empty | |
| 647 // at the beginning of remark to be false. By ensuring that we do | |
| 648 // not observe heap expansions after marking is complete, then we do | |
| 649 // not have this problem. | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
650 if (!concurrent_marking_in_progress() && !force) return; |
| 342 | 651 |
| 652 MemRegion committed = _g1h->g1_committed(); | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
653 assert(committed.start() == _heap_start, "start shouldn't change"); |
| 342 | 654 HeapWord* new_end = committed.end(); |
| 655 if (new_end > _heap_end) { | |
| 656 // The heap has been expanded. | |
| 657 | |
| 658 _heap_end = new_end; | |
| 659 } | |
| 660 // Notice that the heap can also shrink. However, this only happens | |
| 661 // during a Full GC (at least currently) and the entire marking | |
| 662 // phase will bail out and the task will not be restarted. So, let's | |
| 663 // do nothing. | |
| 664 } | |
| 665 | |
| 666 void ConcurrentMark::reset() { | |
| 667 // Starting values for these two. This should be called in a STW | |
| 668 // phase. CM will be notified of any future g1_committed expansions | |
| 669 // will be at the end of evacuation pauses, when tasks are | |
| 670 // inactive. | |
| 671 MemRegion committed = _g1h->g1_committed(); | |
| 672 _heap_start = committed.start(); | |
| 673 _heap_end = committed.end(); | |
| 674 | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
675 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
676 assert(_heap_start != NULL, "heap bounds should look ok"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
677 assert(_heap_end != NULL, "heap bounds should look ok"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
678 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 679 |
| 680 // reset all the marking data structures and any necessary flags | |
| 681 clear_marking_state(); | |
| 682 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
683 if (verbose_low()) { |
| 342 | 684 gclog_or_tty->print_cr("[global] resetting"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
685 } |
| 342 | 686 |
| 687 // We do reset all of them, since different phases will use | |
| 688 // different number of active threads. So, it's easiest to have all | |
| 689 // of them ready. | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
690 for (int i = 0; i < (int) _max_task_num; ++i) { |
| 342 | 691 _tasks[i]->reset(_nextMarkBitMap); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
692 } |
| 342 | 693 |
| 694 // we need this to make sure that the flag is on during the evac | |
| 695 // pause with initial mark piggy-backed | |
| 696 set_concurrent_marking_in_progress(); | |
| 697 } | |
| 698 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
699 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
700 assert(active_tasks <= _max_task_num, "we should not have more"); |
| 342 | 701 |
| 702 _active_tasks = active_tasks; | |
| 703 // Need to update the three data structures below according to the | |
| 704 // number of active threads for this phase. | |
| 705 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 706 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 707 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 708 | |
| 709 _concurrent = concurrent; | |
| 710 // We propagate this to all tasks, not just the active ones. | |
| 711 for (int i = 0; i < (int) _max_task_num; ++i) | |
| 712 _tasks[i]->set_concurrent(concurrent); | |
| 713 | |
| 714 if (concurrent) { | |
| 715 set_concurrent_marking_in_progress(); | |
| 716 } else { | |
| 717 // We currently assume that the concurrent flag has been set to | |
| 718 // false before we start remark. At this point we should also be | |
| 719 // in a STW phase. | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
720 assert(!concurrent_marking_in_progress(), "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
721 assert(_finger == _heap_end, "only way to get here"); |
| 342 | 722 update_g1_committed(true); |
| 723 } | |
| 724 } | |
| 725 | |
| 726 void ConcurrentMark::set_non_marking_state() { | |
| 727 // We set the global marking state to some default values when we're | |
| 728 // not doing marking. | |
| 729 clear_marking_state(); | |
| 730 _active_tasks = 0; | |
| 731 clear_concurrent_marking_in_progress(); | |
| 732 } | |
| 733 | |
| 734 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 735 // The ConcurrentMark instance is never freed. |
| 736 ShouldNotReachHere(); | |
| 342 | 737 } |
| 738 | |
| 739 void ConcurrentMark::clearNextBitmap() { | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
740 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
741 G1CollectorPolicy* g1p = g1h->g1_policy(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
742 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
743 // Make sure that the concurrent mark thread looks to still be in |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
744 // the current cycle. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
745 guarantee(cmThread()->during_cycle(), "invariant"); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
746 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
747 // We are finishing up the current cycle by clearing the next |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
748 // marking bitmap and getting it ready for the next cycle. During |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
749 // this time no other cycle can start. So, let's make sure that this |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
750 // is the case. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
751 guarantee(!g1h->mark_in_progress(), "invariant"); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
752 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
753 // clear the mark bitmap (no grey objects to start with). |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
754 // We need to do this in chunks and offer to yield in between |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
755 // each chunk. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
756 HeapWord* start = _nextMarkBitMap->startWord(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
757 HeapWord* end = _nextMarkBitMap->endWord(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
758 HeapWord* cur = start; |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
759 size_t chunkSize = M; |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
760 while (cur < end) { |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
761 HeapWord* next = cur + chunkSize; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
762 if (next > end) { |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
763 next = end; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
764 } |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
765 MemRegion mr(cur,next); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
766 _nextMarkBitMap->clearRange(mr); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
767 cur = next; |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
768 do_yield_check(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
769 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
770 // Repeat the asserts from above. We'll do them as asserts here to |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
771 // minimize their overhead on the product. However, we'll have |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
772 // them as guarantees at the beginning / end of the bitmap |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
773 // clearing to get some checking in the product. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
774 assert(cmThread()->during_cycle(), "invariant"); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
775 assert(!g1h->mark_in_progress(), "invariant"); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
776 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
777 |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
778 // Repeat the asserts from above. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
779 guarantee(cmThread()->during_cycle(), "invariant"); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1358
diff
changeset
|
780 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 781 } |
| 782 | |
| 783 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
| 784 public: | |
| 785 bool doHeapRegion(HeapRegion* r) { | |
| 786 if (!r->continuesHumongous()) { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
787 r->note_start_of_marking(); |
| 342 | 788 } |
| 789 return false; | |
| 790 } | |
| 791 }; | |
| 792 | |
| 793 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 794 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 795 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 796 | |
| 797 _has_aborted = false; | |
| 798 | |
|
1547
fb1a39993f69
6951319: enable solaris builds using Sun Studio 12 update 1
jcoomes
parents:
1388
diff
changeset
|
799 #ifndef PRODUCT |
| 1044 | 800 if (G1PrintReachableAtInitialMark) { |
| 1388 | 801 print_reachable("at-cycle-start", |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
802 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 803 } |
|
1547
fb1a39993f69
6951319: enable solaris builds using Sun Studio 12 update 1
jcoomes
parents:
1388
diff
changeset
|
804 #endif |
| 342 | 805 |
| 806 // Initialise marking structures. This has to be done in a STW phase. | |
| 807 reset(); | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
808 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
809 // For each region note start of marking. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
810 NoteStartOfMarkHRClosure startcl; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
811 g1h->heap_region_iterate(&startcl); |
| 342 | 812 } |
| 813 | |
| 814 | |
| 815 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 816 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 817 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
818 // If we force an overflow during remark, the remark operation will |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
819 // actually abort and we'll restart concurrent marking. If we always |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
820 // force an oveflow during remark we'll never actually complete the |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
821 // marking phase. So, we initilize this here, at the start of the |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
822 // cycle, so that at the remaining overflow number will decrease at |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
823 // every remark and we'll eventually not need to cause one. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
824 force_overflow_stw()->init(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
825 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
826 // Start Concurrent Marking weak-reference discovery. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
827 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
828 // enable ("weak") refs discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
829 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
830 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 831 |
| 832 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
833 // This is the start of the marking cycle, we're expected all |
|
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
834 // threads to have SATB queues with active set to false. |
|
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
835 satb_mq_set.set_active_all_threads(true, /* new active value */ |
|
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
836 false /* expected_active */); |
| 342 | 837 |
| 838 // update_g1_committed() will be called at the end of an evac pause | |
| 839 // when marking is on. So, it's also called at the end of the | |
| 840 // initial-mark pause to update the heap end, if the heap expands | |
| 841 // during it. No need to call it here. | |
| 842 } | |
| 843 | |
| 844 /* | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
845 * Notice that in the next two methods, we actually leave the STS |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
846 * during the barrier sync and join it immediately afterwards. If we |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
847 * do not do this, the following deadlock can occur: one thread could |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
848 * be in the barrier sync code, waiting for the other thread to also |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
849 * sync up, whereas another one could be trying to yield, while also |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
850 * waiting for the other threads to sync up too. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
851 * |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
852 * Note, however, that this code is also used during remark and in |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
853 * this case we should not attempt to leave / enter the STS, otherwise |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
854 * we'll either hit an asseert (debug / fastdebug) or deadlock |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
855 * (product). So we should only leave / enter the STS if we are |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
856 * operating concurrently. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
857 * |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
858 * Because the thread that does the sync barrier has left the STS, it |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
859 * is possible to be suspended for a Full GC or an evacuation pause |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
860 * could occur. This is actually safe, since the entering the sync |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
861 * barrier is one of the last things do_marking_step() does, and it |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
862 * doesn't manipulate any data structures afterwards. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
863 */ |
| 342 | 864 |
| 865 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
866 if (verbose_low()) { |
| 342 | 867 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
868 } |
| 342 | 869 |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
870 if (concurrent()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
871 ConcurrentGCThread::stsLeave(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
872 } |
| 342 | 873 _first_overflow_barrier_sync.enter(); |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
874 if (concurrent()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
875 ConcurrentGCThread::stsJoin(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
876 } |
| 342 | 877 // at this point everyone should have synced up and not be doing any |
| 878 // more work | |
| 879 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
880 if (verbose_low()) { |
| 342 | 881 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
882 } |
| 342 | 883 |
| 884 // let task 0 do this | |
| 885 if (task_num == 0) { | |
| 886 // task 0 is responsible for clearing the global data structures | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
887 // We should be here because of an overflow. During STW we should |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
888 // not clear the overflow flag since we rely on it being true when |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
889 // we exit this method to abort the pause and restart concurent |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
890 // marking. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
891 clear_marking_state(concurrent() /* 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
|
892 force_overflow()->update(); |
| 342 | 893 |
| 894 if (PrintGC) { | |
| 895 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
| 896 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 897 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
| 898 } | |
| 899 } | |
| 900 | |
| 901 // after this, each task should reset its own data structures then | |
| 902 // then go into the second barrier | |
| 903 } | |
| 904 | |
| 905 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
906 if (verbose_low()) { |
| 342 | 907 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
908 } |
| 342 | 909 |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
910 if (concurrent()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
911 ConcurrentGCThread::stsLeave(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
912 } |
| 342 | 913 _second_overflow_barrier_sync.enter(); |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
914 if (concurrent()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
915 ConcurrentGCThread::stsJoin(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
916 } |
| 342 | 917 // at this point everything should be re-initialised and ready to go |
| 918 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
919 if (verbose_low()) { |
| 342 | 920 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
921 } |
| 342 | 922 } |
| 923 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
924 #ifndef PRODUCT |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
925 void ForceOverflowSettings::init() { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
926 _num_remaining = G1ConcMarkForceOverflow; |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
927 _force = false; |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
928 update(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
929 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
930 |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
931 void ForceOverflowSettings::update() { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
932 if (_num_remaining > 0) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
933 _num_remaining -= 1; |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
934 _force = true; |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
935 } else { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
936 _force = false; |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
937 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
938 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
939 |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
940 bool ForceOverflowSettings::should_force() { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
941 if (_force) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
942 _force = false; |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
943 return true; |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
944 } else { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
945 return false; |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
946 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
947 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
948 #endif // !PRODUCT |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
949 |
| 342 | 950 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
951 guarantee(false, "grayRegionIfNecessary(): don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
952 |
| 342 | 953 // The objects on the region have already been marked "in bulk" by |
| 954 // the caller. We only need to decide whether to push the region on | |
| 955 // the region stack or not. | |
| 956 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
957 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
| 342 | 958 // We're done with marking and waiting for remark. We do not need to |
| 959 // push anything else on the region stack. | |
| 960 return; | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
961 } |
| 342 | 962 |
| 963 HeapWord* finger = _finger; | |
| 964 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
965 if (verbose_low()) { |
| 342 | 966 gclog_or_tty->print_cr("[global] attempting to push " |
| 967 "region ["PTR_FORMAT", "PTR_FORMAT"), finger is at " | |
| 968 PTR_FORMAT, mr.start(), mr.end(), finger); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
969 } |
| 342 | 970 |
| 971 if (mr.start() < finger) { | |
| 972 // The finger is always heap region aligned and it is not possible | |
| 973 // for mr to span heap regions. | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
974 assert(mr.end() <= finger, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
975 |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
976 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
977 assert(mr.start() <= mr.end(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
978 "region boundaries should fall within the committed space"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
979 assert(_heap_start <= mr.start(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
980 "region boundaries should fall within the committed space"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
981 assert(mr.end() <= _heap_end, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
982 "region boundaries should fall within the committed space"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
983 if (verbose_low()) { |
| 342 | 984 gclog_or_tty->print_cr("[global] region ["PTR_FORMAT", "PTR_FORMAT") " |
| 985 "below the finger, pushing it", | |
| 986 mr.start(), mr.end()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
987 } |
| 342 | 988 |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
989 if (!region_stack_push_lock_free(mr)) { |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
990 if (verbose_low()) { |
| 342 | 991 gclog_or_tty->print_cr("[global] region stack has overflown."); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
992 } |
| 342 | 993 } |
| 994 } | |
| 995 } | |
| 996 | |
| 997 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
998 guarantee(false, "markAndGrayObjectIfNecessary(): don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
999 |
| 342 | 1000 // The object is not marked by the caller. We need to at least mark |
| 1001 // it and maybe push in on the stack. | |
| 1002 | |
| 1003 HeapWord* addr = (HeapWord*)p; | |
| 1004 if (!_nextMarkBitMap->isMarked(addr)) { | |
| 1005 // We definitely need to mark it, irrespective whether we bail out | |
| 1006 // because we're done with marking. | |
| 1007 if (_nextMarkBitMap->parMark(addr)) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1008 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
| 342 | 1009 // If we're done with concurrent marking and we're waiting for |
| 1010 // remark, then we're not pushing anything on the stack. | |
| 1011 return; | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1012 } |
| 342 | 1013 |
| 1014 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 1015 // CAS done in parMark(addr) above | |
| 1016 HeapWord* finger = _finger; | |
| 1017 | |
| 1018 if (addr < finger) { | |
| 1019 if (!mark_stack_push(oop(addr))) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1020 if (verbose_low()) { |
| 342 | 1021 gclog_or_tty->print_cr("[global] global stack overflow " |
| 1022 "during parMark"); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1023 } |
| 342 | 1024 } |
| 1025 } | |
| 1026 } | |
| 1027 } | |
| 1028 } | |
| 1029 | |
| 1030 class CMConcurrentMarkingTask: public AbstractGangTask { | |
| 1031 private: | |
| 1032 ConcurrentMark* _cm; | |
| 1033 ConcurrentMarkThread* _cmt; | |
| 1034 | |
| 1035 public: | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1036 void work(uint worker_id) { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
1037 assert(Thread::current()->is_ConcurrentGC_thread(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
1038 "this should only be done by a conc GC thread"); |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1972
diff
changeset
|
1039 ResourceMark rm; |
| 342 | 1040 |
| 1041 double start_vtime = os::elapsedVTime(); | |
| 1042 | |
| 1043 ConcurrentGCThread::stsJoin(); | |
| 1044 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1045 assert(worker_id < _cm->active_tasks(), "invariant"); |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1046 CMTask* the_task = _cm->task(worker_id); |
| 342 | 1047 the_task->record_start_time(); |
| 1048 if (!_cm->has_aborted()) { | |
| 1049 do { | |
| 1050 double start_vtime_sec = os::elapsedVTime(); | |
| 1051 double start_time_sec = os::elapsedTime(); | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1052 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1053 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1054 the_task->do_marking_step(mark_step_duration_ms, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1055 true /* do_stealing */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1056 true /* do_termination */); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1057 |
| 342 | 1058 double end_time_sec = os::elapsedTime(); |
| 1059 double end_vtime_sec = os::elapsedVTime(); | |
| 1060 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 1061 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 1062 _cm->clear_has_overflown(); | |
| 1063 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1064 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 1065 |
| 1066 jlong sleep_time_ms; | |
| 1067 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 1068 sleep_time_ms = | |
| 1069 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 1070 ConcurrentGCThread::stsLeave(); | |
| 1071 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 1072 ConcurrentGCThread::stsJoin(); | |
| 1073 } | |
| 1074 double end_time2_sec = os::elapsedTime(); | |
| 1075 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 1076 | |
| 1077 #if 0 | |
| 1078 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 1079 "overhead %1.4lf", | |
| 1080 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 1081 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 1082 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 1083 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 1084 #endif | |
| 1085 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 1086 } | |
| 1087 the_task->record_end_time(); | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
1088 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 1089 |
| 1090 ConcurrentGCThread::stsLeave(); | |
| 1091 | |
| 1092 double end_vtime = os::elapsedVTime(); | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1093 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 1094 } |
| 1095 | |
| 1096 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 1097 ConcurrentMarkThread* cmt) : | |
| 1098 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 1099 | |
| 1100 ~CMConcurrentMarkingTask() { } | |
| 1101 }; | |
| 1102 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1103 // Calculates the number of active workers for a concurrent |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1104 // phase. |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1105 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 1106 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1107 uint n_conc_workers = 0; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1108 if (!UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1109 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1110 !ForceDynamicNumberOfGCThreads)) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1111 n_conc_workers = max_parallel_marking_threads(); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1112 } else { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1113 n_conc_workers = |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1114 AdaptiveSizePolicy::calc_default_active_workers( |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1115 max_parallel_marking_threads(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1116 1, /* Minimum workers */ |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1117 parallel_marking_threads(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1118 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1119 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1120 // that scaling has already gone into "_max_parallel_marking_threads". |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1121 } |
| 4711 | 1122 assert(n_conc_workers > 0, "Always need at least 1"); |
| 1123 return n_conc_workers; | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1124 } |
| 4711 | 1125 // If we are not running with any parallel GC threads we will not |
| 1126 // have spawned any marking threads either. Hence the number of | |
| 1127 // concurrent workers should be 0. | |
| 1128 return 0; | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1129 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1130 |
| 342 | 1131 void ConcurrentMark::markFromRoots() { |
| 1132 // we might be tempted to assert that: | |
| 1133 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1134 // "inconsistent argument?"); | |
| 1135 // However that wouldn't be right, because it's possible that | |
| 1136 // a safepoint is indeed in progress as a younger generation | |
| 1137 // stop-the-world GC happens even as we mark in this generation. | |
| 1138 | |
| 1139 _restart_for_overflow = false; | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
1140 force_overflow_conc()->init(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1141 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1142 // _g1h has _n_par_threads |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1143 _parallel_marking_threads = calc_parallel_marking_threads(); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1144 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1145 "Maximum number of marking threads exceeded"); |
| 4711 | 1146 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1147 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1148 |
| 1149 // Parallel task terminator is set in "set_phase()" | |
| 1150 set_phase(active_workers, true /* concurrent */); | |
| 342 | 1151 |
| 1152 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1153 if (parallel_marking_threads() > 0) { |
| 4711 | 1154 _parallel_workers->set_active_workers((int)active_workers); |
| 1155 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
| 1156 // and the decisions on that MT processing is made elsewhere. | |
| 1157 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1158 _parallel_workers->run_task(&markingTask); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1159 } else { |
| 342 | 1160 markingTask.work(0); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1161 } |
| 342 | 1162 print_stats(); |
| 1163 } | |
| 1164 | |
| 1165 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1166 // world is stopped at this checkpoint | |
| 1167 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1168 "world should be stopped"); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
1169 |
| 342 | 1170 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1171 | |
| 1172 // If a full collection has happened, we shouldn't do this. | |
| 1173 if (has_aborted()) { | |
| 1174 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1175 return; | |
| 1176 } | |
| 1177 | |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2037
diff
changeset
|
1178 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
|
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2037
diff
changeset
|
1179 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1180 if (VerifyDuringGC) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1181 HandleMark hm; // handle scope |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1182 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1183 Universe::heap()->prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1184 Universe::verify(/* allow dirty */ true, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1185 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1186 /* option */ VerifyOption_G1UsePrevMarking); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1187 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1188 |
| 342 | 1189 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1190 g1p->record_concurrent_mark_remark_start(); | |
| 1191 | |
| 1192 double start = os::elapsedTime(); | |
| 1193 | |
| 1194 checkpointRootsFinalWork(); | |
| 1195 | |
| 1196 double mark_work_end = os::elapsedTime(); | |
| 1197 | |
| 1198 weakRefsWork(clear_all_soft_refs); | |
| 1199 | |
| 1200 if (has_overflown()) { | |
| 1201 // Oops. We overflowed. Restart concurrent marking. | |
| 1202 _restart_for_overflow = true; | |
| 1203 // Clear the flag. We do not need it any more. | |
| 1204 clear_has_overflown(); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1205 if (G1TraceMarkStackOverflow) { |
| 342 | 1206 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1207 } |
| 342 | 1208 } else { |
| 2149 | 1209 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1210 // We're done with marking. |
|
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
1211 // This is the end of the marking cycle, we're expected all |
|
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
1212 // threads to have SATB queues with active set to true. |
| 2149 | 1213 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1214 true /* expected_active */); | |
| 811 | 1215 |
| 1216 if (VerifyDuringGC) { | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1217 HandleMark hm; // handle scope |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1218 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1219 Universe::heap()->prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1220 Universe::verify(/* allow dirty */ true, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1221 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1222 /* option */ VerifyOption_G1UseNextMarking); |
| 811 | 1223 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1224 assert(!restart_for_overflow(), "sanity"); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1225 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1226 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1227 // Reset the marking state if marking completed |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1228 if (!restart_for_overflow()) { |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1229 set_non_marking_state(); |
| 342 | 1230 } |
| 1231 | |
| 1232 #if VERIFY_OBJS_PROCESSED | |
| 1233 _scan_obj_cl.objs_processed = 0; | |
| 1234 ThreadLocalObjQueue::objs_enqueued = 0; | |
| 1235 #endif | |
| 1236 | |
| 1237 // Statistics | |
| 1238 double now = os::elapsedTime(); | |
| 1239 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1240 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1241 _remark_times.add((now - start) * 1000.0); | |
| 1242 | |
| 1243 g1p->record_concurrent_mark_remark_end(); | |
| 1244 } | |
| 1245 | |
| 1246 #define CARD_BM_TEST_MODE 0 | |
| 1247 | |
| 1248 class CalcLiveObjectsClosure: public HeapRegionClosure { | |
| 1249 | |
| 1250 CMBitMapRO* _bm; | |
| 1251 ConcurrentMark* _cm; | |
| 1252 bool _changed; | |
| 1253 bool _yield; | |
| 1254 size_t _words_done; | |
| 1255 size_t _tot_live; | |
| 1256 size_t _tot_used; | |
| 1257 size_t _regions_done; | |
| 1258 double _start_vtime_sec; | |
| 1259 | |
| 1260 BitMap* _region_bm; | |
| 1261 BitMap* _card_bm; | |
| 1262 intptr_t _bottom_card_num; | |
| 1263 bool _final; | |
| 1264 | |
| 1265 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
| 1266 for (intptr_t i = start_card_num; i <= last_card_num; i++) { | |
| 1267 #if CARD_BM_TEST_MODE | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
1268 guarantee(_card_bm->at(i - _bottom_card_num), "Should already be set."); |
| 342 | 1269 #else |
| 1270 _card_bm->par_at_put(i - _bottom_card_num, 1); | |
| 1271 #endif | |
| 1272 } | |
| 1273 } | |
| 1274 | |
| 1275 public: | |
| 1276 CalcLiveObjectsClosure(bool final, | |
| 1277 CMBitMapRO *bm, ConcurrentMark *cm, | |
| 936 | 1278 BitMap* region_bm, BitMap* card_bm) : |
| 342 | 1279 _bm(bm), _cm(cm), _changed(false), _yield(true), |
| 1280 _words_done(0), _tot_live(0), _tot_used(0), | |
| 936 | 1281 _region_bm(region_bm), _card_bm(card_bm),_final(final), |
| 342 | 1282 _regions_done(0), _start_vtime_sec(0.0) |
| 1283 { | |
| 1284 _bottom_card_num = | |
| 1285 intptr_t(uintptr_t(G1CollectedHeap::heap()->reserved_region().start()) >> | |
| 1286 CardTableModRefBS::card_shift); | |
| 1287 } | |
| 1288 | |
| 829 | 1289 // It takes a region that's not empty (i.e., it has at least one |
| 1290 // live object in it and sets its corresponding bit on the region | |
| 1291 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1292 // to 1 the bits on the region bitmap that correspond to its | |
| 1293 // associated "continues humongous" regions. | |
| 1294 void set_bit_for_region(HeapRegion* hr) { | |
| 1295 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1296 | |
| 1297 size_t index = hr->hrs_index(); | |
| 1298 if (!hr->startsHumongous()) { | |
| 1299 // Normal (non-humongous) case: just set the bit. | |
| 1300 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
| 1301 } else { | |
| 1302 // Starts humongous case: calculate how many regions are part of | |
| 1303 // this humongous region and then set the bit range. It might | |
| 1304 // have been a bit more efficient to look at the object that | |
| 1305 // spans these humongous regions to calculate their number from | |
| 1306 // the object's size. However, it's a good idea to calculate | |
| 1307 // this based on the metadata itself, and not the region | |
| 1308 // contents, so that this code is not aware of what goes into | |
| 1309 // the humongous regions (in case this changes in the future). | |
| 1310 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1311 size_t end_index = index + 1; | |
| 831 | 1312 while (end_index < g1h->n_regions()) { |
| 1313 HeapRegion* chr = g1h->region_at(end_index); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1314 if (!chr->continuesHumongous()) break; |
| 829 | 1315 end_index += 1; |
| 1316 } | |
| 1317 _region_bm->par_at_put_range((BitMap::idx_t) index, | |
| 1318 (BitMap::idx_t) end_index, true); | |
| 1319 } | |
| 1320 } | |
| 1321 | |
| 342 | 1322 bool doHeapRegion(HeapRegion* hr) { |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1323 if (!_final && _regions_done == 0) { |
| 342 | 1324 _start_vtime_sec = os::elapsedVTime(); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1325 } |
| 342 | 1326 |
| 639 | 1327 if (hr->continuesHumongous()) { |
| 829 | 1328 // We will ignore these here and process them when their |
| 1329 // associated "starts humongous" region is processed (see | |
| 1330 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1331 // associated "starts humongous" region to have their bit set to | |
| 1332 // 1 since, due to the region chunking in the parallel region | |
| 1333 // iteration, a "continues humongous" region might be visited | |
| 1334 // before its associated "starts humongous". | |
| 639 | 1335 return false; |
| 1336 } | |
| 342 | 1337 |
| 1338 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
| 1339 HeapWord* start = hr->top_at_conc_mark_count(); | |
| 1340 assert(hr->bottom() <= start && start <= hr->end() && | |
| 1341 hr->bottom() <= nextTop && nextTop <= hr->end() && | |
| 1342 start <= nextTop, | |
| 1343 "Preconditions."); | |
| 1344 // Otherwise, record the number of word's we'll examine. | |
| 1345 size_t words_done = (nextTop - start); | |
| 1346 // Find the first marked object at or after "start". | |
| 1347 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
| 1348 size_t marked_bytes = 0; | |
| 1349 | |
| 1350 // Below, the term "card num" means the result of shifting an address | |
| 1351 // by the card shift -- address 0 corresponds to card number 0. One | |
| 1352 // must subtract the card num of the bottom of the heap to obtain a | |
| 1353 // card table index. | |
| 1354 // The first card num of the sequence of live cards currently being | |
| 1355 // constructed. -1 ==> no sequence. | |
| 1356 intptr_t start_card_num = -1; | |
| 1357 // The last card num of the sequence of live cards currently being | |
| 1358 // constructed. -1 ==> no sequence. | |
| 1359 intptr_t last_card_num = -1; | |
| 1360 | |
| 1361 while (start < nextTop) { | |
| 1362 if (_yield && _cm->do_yield_check()) { | |
| 1363 // We yielded. It might be for a full collection, in which case | |
| 1364 // all bets are off; terminate the traversal. | |
| 1365 if (_cm->has_aborted()) { | |
| 1366 _changed = false; | |
| 1367 return true; | |
| 1368 } else { | |
| 1369 // Otherwise, it might be a collection pause, and the region | |
| 1370 // we're looking at might be in the collection set. We'll | |
| 1371 // abandon this region. | |
| 1372 return false; | |
| 1373 } | |
| 1374 } | |
| 1375 oop obj = oop(start); | |
| 1376 int obj_sz = obj->size(); | |
| 1377 // The card num of the start of the current object. | |
| 1378 intptr_t obj_card_num = | |
| 1379 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
| 1380 | |
| 1381 HeapWord* obj_last = start + obj_sz - 1; | |
| 1382 intptr_t obj_last_card_num = | |
| 1383 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
| 1384 | |
| 1385 if (obj_card_num != last_card_num) { | |
| 1386 if (start_card_num == -1) { | |
| 1387 assert(last_card_num == -1, "Both or neither."); | |
| 1388 start_card_num = obj_card_num; | |
| 1389 } else { | |
| 1390 assert(last_card_num != -1, "Both or neither."); | |
| 1391 assert(obj_card_num >= last_card_num, "Inv"); | |
| 1392 if ((obj_card_num - last_card_num) > 1) { | |
| 1393 // Mark the last run, and start a new one. | |
| 1394 mark_card_num_range(start_card_num, last_card_num); | |
| 1395 start_card_num = obj_card_num; | |
| 1396 } | |
| 1397 } | |
| 1398 #if CARD_BM_TEST_MODE | |
| 1399 /* | |
| 1400 gclog_or_tty->print_cr("Setting bits from %d/%d.", | |
| 1401 obj_card_num - _bottom_card_num, | |
| 1402 obj_last_card_num - _bottom_card_num); | |
| 1403 */ | |
| 1404 for (intptr_t j = obj_card_num; j <= obj_last_card_num; j++) { | |
| 1405 _card_bm->par_at_put(j - _bottom_card_num, 1); | |
| 1406 } | |
| 1407 #endif | |
| 1408 } | |
| 1409 // In any case, we set the last card num. | |
| 1410 last_card_num = obj_last_card_num; | |
| 1411 | |
|
1030
dfdaf65c3423
6858886: G1: guarantee(_next_marked_bytes <= used(),"invariant") at heapRegion.hpp:359
apetrusenko
parents:
1023
diff
changeset
|
1412 marked_bytes += (size_t)obj_sz * HeapWordSize; |
| 342 | 1413 // Find the next marked object after this one. |
| 1414 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
| 1415 _changed = true; | |
| 1416 } | |
| 1417 // Handle the last range, if any. | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1418 if (start_card_num != -1) { |
| 342 | 1419 mark_card_num_range(start_card_num, last_card_num); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1420 } |
| 342 | 1421 if (_final) { |
| 1422 // Mark the allocated-since-marking portion... | |
| 1423 HeapWord* tp = hr->top(); | |
| 1424 if (nextTop < tp) { | |
| 1425 start_card_num = | |
| 1426 intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); | |
| 1427 last_card_num = | |
| 1428 intptr_t(uintptr_t(tp) >> CardTableModRefBS::card_shift); | |
| 1429 mark_card_num_range(start_card_num, last_card_num); | |
| 1430 // This definitely means the region has live objects. | |
| 829 | 1431 set_bit_for_region(hr); |
| 342 | 1432 } |
| 1433 } | |
| 1434 | |
| 1435 hr->add_to_marked_bytes(marked_bytes); | |
| 1436 // Update the live region bitmap. | |
| 1437 if (marked_bytes > 0) { | |
| 829 | 1438 set_bit_for_region(hr); |
| 342 | 1439 } |
| 1440 hr->set_top_at_conc_mark_count(nextTop); | |
| 1441 _tot_live += hr->next_live_bytes(); | |
| 1442 _tot_used += hr->used(); | |
| 1443 _words_done = words_done; | |
| 1444 | |
| 1445 if (!_final) { | |
| 1446 ++_regions_done; | |
| 1447 if (_regions_done % 10 == 0) { | |
| 1448 double end_vtime_sec = os::elapsedVTime(); | |
| 1449 double elapsed_vtime_sec = end_vtime_sec - _start_vtime_sec; | |
| 1450 if (elapsed_vtime_sec > (10.0 / 1000.0)) { | |
| 1451 jlong sleep_time_ms = | |
| 1452 (jlong) (elapsed_vtime_sec * _cm->cleanup_sleep_factor() * 1000.0); | |
| 1453 os::sleep(Thread::current(), sleep_time_ms, false); | |
| 1454 _start_vtime_sec = end_vtime_sec; | |
| 1455 } | |
| 1456 } | |
| 1457 } | |
| 1458 | |
| 1459 return false; | |
| 1460 } | |
| 1461 | |
| 1462 bool changed() { return _changed; } | |
| 1463 void reset() { _changed = false; _words_done = 0; } | |
| 1464 void no_yield() { _yield = false; } | |
| 1465 size_t words_done() { return _words_done; } | |
| 1466 size_t tot_live() { return _tot_live; } | |
| 1467 size_t tot_used() { return _tot_used; } | |
| 1468 }; | |
| 1469 | |
| 1470 | |
| 1471 void ConcurrentMark::calcDesiredRegions() { | |
| 1472 _region_bm.clear(); | |
| 1473 _card_bm.clear(); | |
| 1474 CalcLiveObjectsClosure calccl(false /*final*/, | |
| 1475 nextMarkBitMap(), this, | |
| 936 | 1476 &_region_bm, &_card_bm); |
| 342 | 1477 G1CollectedHeap *g1h = G1CollectedHeap::heap(); |
| 1478 g1h->heap_region_iterate(&calccl); | |
| 1479 | |
| 1480 do { | |
| 1481 calccl.reset(); | |
| 1482 g1h->heap_region_iterate(&calccl); | |
| 1483 } while (calccl.changed()); | |
| 1484 } | |
| 1485 | |
| 1486 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1487 protected: | |
| 1488 G1CollectedHeap* _g1h; | |
| 1489 CMBitMap* _bm; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1490 uint _n_workers; |
| 342 | 1491 size_t *_live_bytes; |
| 1492 size_t *_used_bytes; | |
| 1493 BitMap* _region_bm; | |
| 1494 BitMap* _card_bm; | |
| 1495 public: | |
| 1496 G1ParFinalCountTask(G1CollectedHeap* g1h, CMBitMap* bm, | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1497 BitMap* region_bm, BitMap* card_bm) |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1498 : AbstractGangTask("G1 final counting"), _g1h(g1h), |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1499 _bm(bm), _region_bm(region_bm), _card_bm(card_bm), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1500 _n_workers(0) |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1501 { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1502 // Use the value already set as the number of active threads |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1503 // in the call to run_task(). Needed for the allocation of |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1504 // _live_bytes and _used_bytes. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1505 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1506 assert( _g1h->workers()->active_workers() > 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1507 "Should have been previously set"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1508 _n_workers = _g1h->workers()->active_workers(); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1509 } else { |
| 342 | 1510 _n_workers = 1; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1511 } |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1512 |
| 342 | 1513 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); |
| 1514 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
| 1515 } | |
| 1516 | |
| 1517 ~G1ParFinalCountTask() { | |
| 1518 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
| 1519 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
| 1520 } | |
| 1521 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1522 void work(uint worker_id) { |
| 342 | 1523 CalcLiveObjectsClosure calccl(true /*final*/, |
| 1524 _bm, _g1h->concurrent_mark(), | |
| 936 | 1525 _region_bm, _card_bm); |
| 342 | 1526 calccl.no_yield(); |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
1527 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1528 _g1h->heap_region_par_iterate_chunked(&calccl, worker_id, |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1529 (int) _n_workers, |
| 355 | 1530 HeapRegion::FinalCountClaimValue); |
| 342 | 1531 } else { |
| 1532 _g1h->heap_region_iterate(&calccl); | |
| 1533 } | |
| 1534 assert(calccl.complete(), "Shouldn't have yielded!"); | |
| 1535 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1536 assert(worker_id < _n_workers, "invariant"); |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1537 _live_bytes[worker_id] = calccl.tot_live(); |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1538 _used_bytes[worker_id] = calccl.tot_used(); |
| 342 | 1539 } |
| 1540 size_t live_bytes() { | |
| 1541 size_t live_bytes = 0; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1542 for (uint i = 0; i < _n_workers; ++i) |
| 342 | 1543 live_bytes += _live_bytes[i]; |
| 1544 return live_bytes; | |
| 1545 } | |
| 1546 size_t used_bytes() { | |
| 1547 size_t used_bytes = 0; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1548 for (uint i = 0; i < _n_workers; ++i) |
| 342 | 1549 used_bytes += _used_bytes[i]; |
| 1550 return used_bytes; | |
| 1551 } | |
| 1552 }; | |
| 1553 | |
| 1554 class G1ParNoteEndTask; | |
| 1555 | |
| 1556 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1557 G1CollectedHeap* _g1; | |
| 1558 int _worker_num; | |
| 1559 size_t _max_live_bytes; | |
| 1560 size_t _regions_claimed; | |
| 1561 size_t _freed_bytes; | |
| 2173 | 1562 FreeRegionList* _local_cleanup_list; |
| 4072 | 1563 OldRegionSet* _old_proxy_set; |
| 2173 | 1564 HumongousRegionSet* _humongous_proxy_set; |
| 1565 HRRSCleanupTask* _hrrs_cleanup_task; | |
| 342 | 1566 double _claimed_region_time; |
| 1567 double _max_region_time; | |
| 1568 | |
| 1569 public: | |
| 1570 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1571 int worker_num, |
| 1572 FreeRegionList* local_cleanup_list, | |
| 4072 | 1573 OldRegionSet* old_proxy_set, |
| 2173 | 1574 HumongousRegionSet* humongous_proxy_set, |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1575 HRRSCleanupTask* hrrs_cleanup_task) : |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1576 _g1(g1), _worker_num(worker_num), |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1577 _max_live_bytes(0), _regions_claimed(0), |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1578 _freed_bytes(0), |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1579 _claimed_region_time(0.0), _max_region_time(0.0), |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1580 _local_cleanup_list(local_cleanup_list), |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1581 _old_proxy_set(old_proxy_set), |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1582 _humongous_proxy_set(humongous_proxy_set), |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1583 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1584 |
| 342 | 1585 size_t freed_bytes() { return _freed_bytes; } |
| 1586 | |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1587 bool doHeapRegion(HeapRegion *hr) { |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1588 // We use a claim value of zero here because all regions |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1589 // were claimed with value 1 in the FinalCount task. |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1590 hr->reset_gc_time_stamp(); |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1591 if (!hr->continuesHumongous()) { |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1592 double start = os::elapsedTime(); |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1593 _regions_claimed++; |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1594 hr->note_end_of_marking(); |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1595 _max_live_bytes += hr->max_live_bytes(); |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1596 _g1->free_region_if_empty(hr, |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1597 &_freed_bytes, |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1598 _local_cleanup_list, |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1599 _old_proxy_set, |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1600 _humongous_proxy_set, |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1601 _hrrs_cleanup_task, |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1602 true /* par */); |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1603 double region_time = (os::elapsedTime() - start); |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1604 _claimed_region_time += region_time; |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1605 if (region_time > _max_region_time) { |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1606 _max_region_time = region_time; |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1607 } |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1608 } |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1609 return false; |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
1610 } |
| 342 | 1611 |
| 1612 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1613 size_t regions_claimed() { return _regions_claimed; } | |
| 1614 double claimed_region_time_sec() { return _claimed_region_time; } | |
| 1615 double max_region_time_sec() { return _max_region_time; } | |
| 1616 }; | |
| 1617 | |
| 1618 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1619 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1620 |
| 342 | 1621 protected: |
| 1622 G1CollectedHeap* _g1h; | |
| 1623 size_t _max_live_bytes; | |
| 1624 size_t _freed_bytes; | |
| 2152 | 1625 FreeRegionList* _cleanup_list; |
| 1626 | |
| 342 | 1627 public: |
| 1628 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1629 FreeRegionList* cleanup_list) : |
| 342 | 1630 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1631 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1632 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1633 void work(uint worker_id) { |
| 342 | 1634 double start = os::elapsedTime(); |
| 2173 | 1635 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 4072 | 1636 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
| 2173 | 1637 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
| 1638 HRRSCleanupTask hrrs_cleanup_task; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1639 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
| 4072 | 1640 &old_proxy_set, |
| 2173 | 1641 &humongous_proxy_set, |
| 1642 &hrrs_cleanup_task); | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
1643 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1644 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1645 _g1h->workers()->active_workers(), |
| 355 | 1646 HeapRegion::NoteEndClaimValue); |
| 342 | 1647 } else { |
| 1648 _g1h->heap_region_iterate(&g1_note_end); | |
| 1649 } | |
| 1650 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1651 | |
| 2152 | 1652 // Now update the lists |
| 1653 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
| 1654 NULL /* free_list */, | |
| 4072 | 1655 &old_proxy_set, |
| 2173 | 1656 &humongous_proxy_set, |
| 2152 | 1657 true /* par */); |
| 342 | 1658 { |
| 1659 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 1660 _max_live_bytes += g1_note_end.max_live_bytes(); | |
| 1661 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1662 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1663 // If we iterate over the global cleanup list at the end of |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1664 // cleanup to do this printing we will not guarantee to only |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1665 // generate output for the newly-reclaimed regions (the list |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1666 // might not be empty at the beginning of cleanup; we might |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1667 // still be working on its previous contents). So we do the |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1668 // printing here, before we append the new regions to the global |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1669 // cleanup list. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1670 |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1671 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1672 if (hr_printer->is_active()) { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1673 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1674 while (iter.more_available()) { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1675 HeapRegion* hr = iter.get_next(); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1676 hr_printer->cleanup(hr); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1677 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1678 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3776
diff
changeset
|
1679 |
| 2173 | 1680 _cleanup_list->add_as_tail(&local_cleanup_list); |
| 1681 assert(local_cleanup_list.is_empty(), "post-condition"); | |
| 1682 | |
| 1683 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1684 } |
| 1685 double end = os::elapsedTime(); | |
| 1686 if (G1PrintParCleanupStats) { | |
| 1687 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1688 "claimed %u regions (tot = %8.3f ms, max = %8.3f ms).\n", |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1689 worker_id, start, end, (end-start)*1000.0, |
| 342 | 1690 g1_note_end.regions_claimed(), |
| 1691 g1_note_end.claimed_region_time_sec()*1000.0, | |
| 1692 g1_note_end.max_region_time_sec()*1000.0); | |
| 1693 } | |
| 1694 } | |
| 1695 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1696 size_t freed_bytes() { return _freed_bytes; } | |
| 1697 }; | |
| 1698 | |
| 1699 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 1700 protected: | |
| 1701 G1RemSet* _g1rs; | |
| 1702 BitMap* _region_bm; | |
| 1703 BitMap* _card_bm; | |
| 1704 public: | |
| 1705 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 1706 BitMap* region_bm, BitMap* card_bm) : | |
| 1707 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
| 1708 _region_bm(region_bm), _card_bm(card_bm) | |
| 1709 {} | |
| 1710 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1711 void work(uint worker_id) { |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
1712 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1713 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 1714 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 1715 } else { |
| 1716 _g1rs->scrub(_region_bm, _card_bm); | |
| 1717 } | |
| 1718 } | |
| 1719 | |
| 1720 }; | |
| 1721 | |
| 1722 void ConcurrentMark::cleanup() { | |
| 1723 // world is stopped at this checkpoint | |
| 1724 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1725 "world should be stopped"); | |
| 1726 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1727 | |
| 1728 // If a full collection has happened, we shouldn't do this. | |
| 1729 if (has_aborted()) { | |
| 1730 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1731 return; | |
| 1732 } | |
| 1733 | |
| 4072 | 1734 HRSPhaseSetter x(HRSPhaseCleanup); |
| 2152 | 1735 g1h->verify_region_sets_optional(); |
| 1736 | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1737 if (VerifyDuringGC) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1738 HandleMark hm; // handle scope |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1739 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1740 Universe::heap()->prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1741 Universe::verify(/* allow dirty */ true, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1742 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1743 /* option */ VerifyOption_G1UsePrevMarking); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1744 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1745 |
| 342 | 1746 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 1747 g1p->record_concurrent_mark_cleanup_start(); | |
| 1748 | |
| 1749 double start = os::elapsedTime(); | |
| 1750 | |
| 2173 | 1751 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 1752 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1753 uint n_workers; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1754 |
| 342 | 1755 // Do counting once more with the world stopped for good measure. |
| 1756 G1ParFinalCountTask g1_par_count_task(g1h, nextMarkBitMap(), | |
| 1757 &_region_bm, &_card_bm); | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
1758 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 355 | 1759 assert(g1h->check_heap_region_claim_values( |
| 1760 HeapRegion::InitialClaimValue), | |
| 1761 "sanity check"); | |
| 1762 | |
| 4711 | 1763 g1h->set_par_threads(); |
| 1764 n_workers = g1h->n_par_threads(); | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
1765 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 1766 "Should not have been reset"); |
| 342 | 1767 g1h->workers()->run_task(&g1_par_count_task); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1768 // Done with the parallel phase so reset to 0. |
| 342 | 1769 g1h->set_par_threads(0); |
| 355 | 1770 |
| 1771 assert(g1h->check_heap_region_claim_values( | |
| 1772 HeapRegion::FinalCountClaimValue), | |
| 1773 "sanity check"); | |
| 342 | 1774 } else { |
| 4711 | 1775 n_workers = 1; |
| 342 | 1776 g1_par_count_task.work(0); |
| 1777 } | |
| 1778 | |
| 1779 size_t known_garbage_bytes = | |
| 1780 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
| 1781 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
| 1782 | |
| 1783 size_t start_used_bytes = g1h->used(); | |
| 1784 _at_least_one_mark_complete = true; | |
| 1785 g1h->set_marking_complete(); | |
| 1786 | |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3867
diff
changeset
|
1787 ergo_verbose4(ErgoConcCycles, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3867
diff
changeset
|
1788 "finish cleanup", |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3867
diff
changeset
|
1789 ergo_format_byte("occupancy") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3867
diff
changeset
|
1790 ergo_format_byte("capacity") |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3867
diff
changeset
|
1791 ergo_format_byte_perc("known garbage"), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3867
diff
changeset
|
1792 start_used_bytes, g1h->capacity(), |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3867
diff
changeset
|
1793 known_garbage_bytes, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3867
diff
changeset
|
1794 ((double) known_garbage_bytes / (double) g1h->capacity()) * 100.0); |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3867
diff
changeset
|
1795 |
| 342 | 1796 double count_end = os::elapsedTime(); |
| 1797 double this_final_counting_time = (count_end - start); | |
| 1798 if (G1PrintParCleanupStats) { | |
| 1799 gclog_or_tty->print_cr("Cleanup:"); | |
| 1800 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
| 1801 this_final_counting_time*1000.0); | |
| 1802 } | |
| 1803 _total_counting_time += this_final_counting_time; | |
| 1804 | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
1805 if (G1PrintRegionLivenessInfo) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
1806 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
1807 _g1h->heap_region_iterate(&cl); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
1808 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
1809 |
| 342 | 1810 // Install newly created mark bitMap as "prev". |
| 1811 swapMarkBitMaps(); | |
| 1812 | |
| 1813 g1h->reset_gc_time_stamp(); | |
| 1814 | |
| 1815 // Note end of marking in all heap regions. | |
| 1816 double note_end_start = os::elapsedTime(); | |
| 2152 | 1817 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
1818 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1819 g1h->set_par_threads((int)n_workers); |
| 342 | 1820 g1h->workers()->run_task(&g1_par_note_end_task); |
| 1821 g1h->set_par_threads(0); | |
| 355 | 1822 |
| 1823 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 1824 "sanity check"); | |
| 342 | 1825 } else { |
| 1826 g1_par_note_end_task.work(0); | |
| 1827 } | |
| 2152 | 1828 |
| 1829 if (!cleanup_list_is_empty()) { | |
| 1830 // The cleanup list is not empty, so we'll have to process it | |
| 1831 // concurrently. Notify anyone else that might be wanting free | |
| 1832 // regions that there will be more free regions coming soon. | |
| 1833 g1h->set_free_regions_coming(); | |
| 1834 } | |
| 342 | 1835 double note_end_end = os::elapsedTime(); |
| 1836 if (G1PrintParCleanupStats) { | |
| 1837 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
| 1838 (note_end_end - note_end_start)*1000.0); | |
| 1839 } | |
| 1840 | |
| 1841 // call below, since it affects the metric by which we sort the heap | |
| 1842 // regions. | |
| 1843 if (G1ScrubRemSets) { | |
| 1844 double rs_scrub_start = os::elapsedTime(); | |
| 1845 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
1846 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1847 g1h->set_par_threads((int)n_workers); |
| 342 | 1848 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 1849 g1h->set_par_threads(0); | |
| 355 | 1850 |
| 1851 assert(g1h->check_heap_region_claim_values( | |
| 1852 HeapRegion::ScrubRemSetClaimValue), | |
| 1853 "sanity check"); | |
| 342 | 1854 } else { |
| 1855 g1_par_scrub_rs_task.work(0); | |
| 1856 } | |
| 1857 | |
| 1858 double rs_scrub_end = os::elapsedTime(); | |
| 1859 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 1860 _total_rs_scrub_time += this_rs_scrub_time; | |
| 1861 } | |
| 1862 | |
| 1863 // this will also free any regions totally full of garbage objects, | |
| 1864 // and sort the regions. | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
1865 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 1866 |
| 1867 // Statistics. | |
| 1868 double end = os::elapsedTime(); | |
| 1869 _cleanup_times.add((end - start) * 1000.0); | |
| 1870 | |
| 1871 if (PrintGC || PrintGCDetails) { | |
| 1872 g1h->print_size_transition(gclog_or_tty, | |
| 1873 start_used_bytes, | |
| 1874 g1h->used(), | |
| 1875 g1h->capacity()); | |
| 1876 } | |
| 1877 | |
| 1878 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
| 1879 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
| 1880 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
1881 // Clean up will have freed any regions completely full of garbage. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
1882 // Update the soft reference policy with the new heap occupancy. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
1883 Universe::update_heap_info_at_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
1884 |
| 342 | 1885 // We need to make this be a "collection" so any collection pause that |
| 1886 // races with it goes around and waits for completeCleanup to finish. | |
| 1887 g1h->increment_total_collections(); | |
| 1888 | |
| 751 | 1889 if (VerifyDuringGC) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1890 HandleMark hm; // handle scope |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1891 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1892 Universe::heap()->prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1893 Universe::verify(/* allow dirty */ true, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1894 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
1895 /* option */ VerifyOption_G1UsePrevMarking); |
| 342 | 1896 } |
| 2152 | 1897 |
| 1898 g1h->verify_region_sets_optional(); | |
| 342 | 1899 } |
| 1900 | |
| 1901 void ConcurrentMark::completeCleanup() { | |
| 1902 if (has_aborted()) return; | |
| 1903 | |
| 2152 | 1904 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1905 | |
| 1906 _cleanup_list.verify_optional(); | |
| 2361 | 1907 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 1908 |
| 1909 if (G1ConcRegionFreeingVerbose) { | |
| 1910 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
| 1911 "cleanup list has "SIZE_FORMAT" entries", | |
| 1912 _cleanup_list.length()); | |
| 1913 } | |
| 1914 | |
| 1915 // Noone else should be accessing the _cleanup_list at this point, | |
| 1916 // so it's not necessary to take any locks | |
| 1917 while (!_cleanup_list.is_empty()) { | |
| 1918 HeapRegion* hr = _cleanup_list.remove_head(); | |
| 1919 assert(hr != NULL, "the list was not empty"); | |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3316
diff
changeset
|
1920 hr->par_clear(); |
| 2361 | 1921 tmp_free_list.add_as_tail(hr); |
| 2152 | 1922 |
| 1923 // Instead of adding one region at a time to the secondary_free_list, | |
| 1924 // we accumulate them in the local list and move them a few at a | |
| 1925 // time. This also cuts down on the number of notify_all() calls | |
| 1926 // we do during this process. We'll also append the local list when | |
| 1927 // _cleanup_list is empty (which means we just removed the last | |
| 1928 // region from the _cleanup_list). | |
| 2361 | 1929 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 1930 _cleanup_list.is_empty()) { |
| 1931 if (G1ConcRegionFreeingVerbose) { | |
| 1932 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
| 1933 "appending "SIZE_FORMAT" entries to the " | |
| 1934 "secondary_free_list, clean list still has " | |
| 1935 SIZE_FORMAT" entries", | |
| 2361 | 1936 tmp_free_list.length(), |
| 2152 | 1937 _cleanup_list.length()); |
| 342 | 1938 } |
| 2152 | 1939 |
| 1940 { | |
| 1941 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 2361 | 1942 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
| 2152 | 1943 SecondaryFreeList_lock->notify_all(); |
| 1944 } | |
| 1945 | |
| 1946 if (G1StressConcRegionFreeing) { | |
| 1947 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 1948 os::sleep(Thread::current(), (jlong) 1, false); | |
| 1949 } | |
| 1950 } | |
| 342 | 1951 } |
| 1952 } | |
| 2361 | 1953 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 1954 } |
| 1955 | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1956 // Support closures for reference procssing in G1 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1957 |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
1958 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
1959 HeapWord* addr = (HeapWord*)obj; |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
1960 return addr != NULL && |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
1961 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
1962 } |
| 342 | 1963 |
| 1964 class G1CMKeepAliveClosure: public OopClosure { | |
| 1965 G1CollectedHeap* _g1; | |
| 1966 ConcurrentMark* _cm; | |
| 1967 CMBitMap* _bitMap; | |
| 1968 public: | |
| 1969 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm, | |
| 1970 CMBitMap* bitMap) : | |
| 1971 _g1(g1), _cm(cm), | |
| 1972 _bitMap(bitMap) {} | |
| 1973 | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1974 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1975 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1976 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
1977 template <class T> void do_oop_work(T* p) { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1978 oop obj = oopDesc::load_decode_heap_oop(p); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1979 HeapWord* addr = (HeapWord*)obj; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1980 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1981 if (_cm->verbose_high()) { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1982 gclog_or_tty->print_cr("\t[0] we're looking at location " |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1983 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1984 p, (void*) obj); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
1985 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1986 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1987 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
| 342 | 1988 _bitMap->mark(addr); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
1989 _cm->mark_stack_push(obj); |
| 342 | 1990 } |
| 1991 } | |
| 1992 }; | |
| 1993 | |
| 1994 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
| 1995 CMMarkStack* _markStack; | |
| 1996 CMBitMap* _bitMap; | |
| 1997 G1CMKeepAliveClosure* _oopClosure; | |
| 1998 public: | |
| 1999 G1CMDrainMarkingStackClosure(CMBitMap* bitMap, CMMarkStack* markStack, | |
| 2000 G1CMKeepAliveClosure* oopClosure) : | |
| 2001 _bitMap(bitMap), | |
| 2002 _markStack(markStack), | |
| 2003 _oopClosure(oopClosure) | |
| 2004 {} | |
| 2005 | |
| 2006 void do_void() { | |
| 2007 _markStack->drain((OopClosure*)_oopClosure, _bitMap, false); | |
| 2008 } | |
| 2009 }; | |
| 2010 | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2011 // 'Keep Alive' closure used by parallel reference processing. |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2012 // An instance of this closure is used in the parallel reference processing |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2013 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2014 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2015 // placed on to discovered ref lists once so we can mark and push with no |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2016 // need to check whether the object has already been marked. Using the |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2017 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2018 // operating on the global mark stack. This means that an individual |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2019 // worker would be doing lock-free pushes while it processes its own |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2020 // discovered ref list followed by drain call. If the discovered ref lists |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2021 // are unbalanced then this could cause interference with the other |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2022 // workers. Using a CMTask (and its embedded local data structures) |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2023 // avoids that potential interference. |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2024 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2025 ConcurrentMark* _cm; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2026 CMTask* _task; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2027 int _ref_counter_limit; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2028 int _ref_counter; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2029 public: |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2030 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2031 _cm(cm), _task(task), |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2032 _ref_counter_limit(G1RefProcDrainInterval) { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2033 assert(_ref_counter_limit > 0, "sanity"); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2034 _ref_counter = _ref_counter_limit; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2035 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2036 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2037 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2038 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2039 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2040 template <class T> void do_oop_work(T* p) { |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2041 if (!_cm->has_overflown()) { |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2042 oop obj = oopDesc::load_decode_heap_oop(p); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2043 if (_cm->verbose_high()) { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2044 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2045 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2046 _task->task_id(), p, (void*) obj); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2047 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2048 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2049 _task->deal_with_reference(obj); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2050 _ref_counter--; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2051 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2052 if (_ref_counter == 0) { |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2053 // We have dealt with _ref_counter_limit references, pushing them and objects |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2054 // reachable from them on to the local stack (and possibly the global stack). |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2055 // Call do_marking_step() to process these entries. We call the routine in a |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2056 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2057 // with the entries that we've pushed as a result of the deal_with_reference |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2058 // calls above) or we overflow. |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2059 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2060 // while there may still be some work to do. (See the comment at the |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2061 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2062 // is reaching the specified time target.) It is only when |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2063 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2064 // that the marking has completed. |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2065 do { |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2066 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2067 _task->do_marking_step(mark_step_duration_ms, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2068 false /* do_stealing */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2069 false /* do_termination */); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2070 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2071 _ref_counter = _ref_counter_limit; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2072 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2073 } else { |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2074 if (_cm->verbose_high()) { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2075 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2076 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2077 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2078 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2079 }; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2080 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2081 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2082 ConcurrentMark* _cm; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2083 CMTask* _task; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2084 public: |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2085 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2086 _cm(cm), _task(task) |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2087 {} |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2088 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2089 void do_void() { |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2090 do { |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2091 if (_cm->verbose_high()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2092 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2093 _task->task_id()); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2094 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2095 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2096 // We call CMTask::do_marking_step() to completely drain the local and |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2097 // global marking stacks. The routine is called in a loop, which we'll |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2098 // exit if there's nothing more to do (i.e. we'completely drained the |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2099 // entries that were pushed as a result of applying the |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2100 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2101 // lists above) or we overflow the global marking stack. |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2102 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2103 // while there may still be some work to do. (See the comment at the |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2104 // beginning of CMTask::do_marking_step() for those conditions - one of which |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2105 // is reaching the specified time target.) It is only when |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2106 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2107 // that the marking has completed. |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2108 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2109 _task->do_marking_step(1000000000.0 /* something very large */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2110 true /* do_stealing */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2111 true /* do_termination */); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2112 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2113 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2114 }; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2115 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2116 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2117 // reference processing at the end of G1 concurrent marking |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2118 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2119 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2120 private: |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2121 G1CollectedHeap* _g1h; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2122 ConcurrentMark* _cm; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2123 WorkGang* _workers; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2124 int _active_workers; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2125 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2126 public: |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2127 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2128 ConcurrentMark* cm, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2129 WorkGang* workers, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2130 int n_workers) : |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2131 _g1h(g1h), _cm(cm), |
|
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2132 _workers(workers), _active_workers(n_workers) { } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2133 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2134 // Executes the given task using concurrent marking worker threads. |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2135 virtual void execute(ProcessTask& task); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2136 virtual void execute(EnqueueTask& task); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2137 }; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2138 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2139 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2140 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2141 ProcessTask& _proc_task; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2142 G1CollectedHeap* _g1h; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2143 ConcurrentMark* _cm; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2144 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2145 public: |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2146 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2147 G1CollectedHeap* g1h, |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2148 ConcurrentMark* cm) : |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2149 AbstractGangTask("Process reference objects in parallel"), |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2150 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2151 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2152 virtual void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2153 CMTask* marking_task = _cm->task(worker_id); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2154 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2155 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2156 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2157 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2158 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2159 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2160 }; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2161 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2162 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2163 assert(_workers != NULL, "Need parallel worker threads."); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2164 |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2165 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2166 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2167 // We need to reset the phase for each task execution so that |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2168 // the termination protocol of CMTask::do_marking_step works. |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2169 _cm->set_phase(_active_workers, false /* concurrent */); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2170 _g1h->set_par_threads(_active_workers); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2171 _workers->run_task(&proc_task_proxy); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2172 _g1h->set_par_threads(0); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2173 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2174 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2175 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2176 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2177 EnqueueTask& _enq_task; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2178 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2179 public: |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2180 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2181 AbstractGangTask("Enqueue reference objects in parallel"), |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2182 _enq_task(enq_task) { } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2183 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2184 virtual void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2185 _enq_task.work(worker_id); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2186 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2187 }; |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2188 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2189 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2190 assert(_workers != NULL, "Need parallel worker threads."); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2191 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2192 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2193 |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2194 _g1h->set_par_threads(_active_workers); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2195 _workers->run_task(&enq_task_proxy); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2196 _g1h->set_par_threads(0); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2197 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2198 |
| 342 | 2199 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
| 2200 ResourceMark rm; | |
| 2201 HandleMark hm; | |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2202 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2203 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2204 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2205 // Is alive closure. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2206 G1CMIsAliveClosure g1_is_alive(g1h); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2207 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2208 // Inner scope to exclude the cleaning of the string and symbol |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2209 // tables from the displayed time. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2210 { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2211 bool verbose = PrintGC && PrintGCDetails; |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2212 if (verbose) { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2213 gclog_or_tty->put(' '); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2214 } |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2215 TraceTime t("GC ref-proc", verbose, false, gclog_or_tty); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2216 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2217 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2218 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2219 // See the comment in G1CollectedHeap::ref_processing_init() |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2220 // about how reference processing currently works in G1. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2221 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2222 // Process weak references. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2223 rp->setup_policy(clear_all_soft_refs); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2224 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2225 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2226 G1CMKeepAliveClosure g1_keep_alive(g1h, this, nextMarkBitMap()); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2227 G1CMDrainMarkingStackClosure |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2228 g1_drain_mark_stack(nextMarkBitMap(), &_markStack, &g1_keep_alive); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2229 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2230 // We use the work gang from the G1CollectedHeap and we utilize all |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2231 // the worker threads. |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2232 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2233 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2234 |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2235 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2236 g1h->workers(), active_workers); |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2237 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2238 if (rp->processing_is_mt()) { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2239 // Set the degree of MT here. If the discovery is done MT, there |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2240 // may have been a different number of threads doing the discovery |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2241 // and a different number of discovered lists may have Ref objects. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2242 // That is OK as long as the Reference lists are balanced (see |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2243 // balance_all_queues() and balance_queues()). |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2244 rp->set_active_mt_degree(active_workers); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2245 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2246 rp->process_discovered_references(&g1_is_alive, |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2247 &g1_keep_alive, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2248 &g1_drain_mark_stack, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2249 &par_task_executor); |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2250 |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2251 // The work routines of the parallel keep_alive and drain_marking_stack |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2252 // will set the has_overflown flag if we overflow the global marking |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2253 // stack. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2254 } else { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2255 rp->process_discovered_references(&g1_is_alive, |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2256 &g1_keep_alive, |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2257 &g1_drain_mark_stack, |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2258 NULL); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2259 } |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2260 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2261 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2262 "mark stack should be empty (unless it overflowed)"); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2263 if (_markStack.overflow()) { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2264 // Should have been done already when we tried to push an |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2265 // entry on to the global mark stack. But let's do it again. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2266 set_has_overflown(); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2267 } |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2268 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2269 if (rp->processing_is_mt()) { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2270 assert(rp->num_q() == active_workers, "why not"); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2271 rp->enqueue_discovered_references(&par_task_executor); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2272 } else { |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2273 rp->enqueue_discovered_references(); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2274 } |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2275 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2276 rp->verify_no_references_recorded(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2277 assert(!rp->discovery_enabled(), "Post condition"); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2278 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2279 |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2280 // Now clean up stale oops in StringTable |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2281 StringTable::unlink(&g1_is_alive); |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2282 // Clean up unreferenced symbols in symbol table. |
|
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2283 SymbolTable::unlink(); |
| 342 | 2284 } |
| 2285 | |
| 2286 void ConcurrentMark::swapMarkBitMaps() { | |
| 2287 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2288 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2289 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2290 } | |
| 2291 | |
| 2292 class CMRemarkTask: public AbstractGangTask { | |
| 2293 private: | |
| 2294 ConcurrentMark *_cm; | |
| 2295 | |
| 2296 public: | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2297 void work(uint worker_id) { |
| 342 | 2298 // Since all available tasks are actually started, we should |
| 2299 // only proceed if we're supposed to be actived. | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2300 if (worker_id < _cm->active_tasks()) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2301 CMTask* task = _cm->task(worker_id); |
| 342 | 2302 task->record_start_time(); |
| 2303 do { | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2304 task->do_marking_step(1000000000.0 /* something very large */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2305 true /* do_stealing */, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2306 true /* do_termination */); |
| 342 | 2307 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2308 // If we overflow, then we do not want to restart. We instead | |
| 2309 // want to abort remark and do concurrent marking again. | |
| 2310 task->record_end_time(); | |
| 2311 } | |
| 2312 } | |
| 2313 | |
| 4711 | 2314 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2315 AbstractGangTask("Par Remark"), _cm(cm) { |
| 4711 | 2316 _cm->terminator()->reset_for_reuse(active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2317 } |
| 342 | 2318 }; |
| 2319 | |
| 2320 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2321 ResourceMark rm; | |
| 2322 HandleMark hm; | |
| 2323 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2324 | |
| 2325 g1h->ensure_parsability(false); | |
| 2326 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2327 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2328 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2329 // this is remark, so we'll use up all active threads |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2330 uint active_workers = g1h->workers()->active_workers(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2331 if (active_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2332 assert(active_workers > 0, "Should have been set earlier"); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2333 active_workers = (uint) ParallelGCThreads; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2334 g1h->workers()->set_active_workers(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2335 } |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2336 set_phase(active_workers, false /* concurrent */); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2337 // Leave _parallel_marking_threads at it's |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2338 // value originally calculated in the ConcurrentMark |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2339 // constructor and pass values of the active workers |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2340 // through the gang in the task. |
| 342 | 2341 |
| 4711 | 2342 CMRemarkTask remarkTask(this, active_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2343 g1h->set_par_threads(active_workers); |
| 342 | 2344 g1h->workers()->run_task(&remarkTask); |
| 2345 g1h->set_par_threads(0); | |
| 2346 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2347 G1CollectedHeap::StrongRootsScope srs(g1h); |
| 342 | 2348 // this is remark, so we'll use up all available threads |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2349 uint active_workers = 1; |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2350 set_phase(active_workers, false /* concurrent */); |
| 342 | 2351 |
| 4711 | 2352 CMRemarkTask remarkTask(this, active_workers); |
| 342 | 2353 // We will start all available threads, even if we decide that the |
| 2354 // active_workers will be fewer. The extra ones will just bail out | |
| 2355 // immediately. | |
| 2356 remarkTask.work(0); | |
| 2357 } | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2358 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2359 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2360 |
| 2361 print_stats(); | |
| 2362 | |
| 2363 #if VERIFY_OBJS_PROCESSED | |
| 2364 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
| 2365 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
| 2366 _scan_obj_cl.objs_processed, | |
| 2367 ThreadLocalObjQueue::objs_enqueued); | |
| 2368 guarantee(_scan_obj_cl.objs_processed == | |
| 2369 ThreadLocalObjQueue::objs_enqueued, | |
| 2370 "Different number of objs processed and enqueued."); | |
| 2371 } | |
| 2372 #endif | |
| 2373 } | |
| 2374 | |
| 1044 | 2375 #ifndef PRODUCT |
| 2376 | |
| 1388 | 2377 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2378 private: |
| 2379 G1CollectedHeap* _g1h; | |
| 2380 outputStream* _out; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2381 VerifyOption _vo; |
| 1388 | 2382 bool _all; |
| 342 | 2383 |
| 2384 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2385 PrintReachableOopClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2386 VerifyOption vo, |
| 1388 | 2387 bool all) : |
| 1044 | 2388 _g1h(G1CollectedHeap::heap()), |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2389 _out(out), _vo(vo), _all(all) { } |
| 342 | 2390 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2391 void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2392 void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2393 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2394 template <class T> void do_oop_work(T* p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2395 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2396 const char* str = NULL; |
| 2397 const char* str2 = ""; | |
| 2398 | |
| 1388 | 2399 if (obj == NULL) { |
| 2400 str = ""; | |
| 2401 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2402 str = " O"; | |
| 2403 } else { | |
| 342 | 2404 HeapRegion* hr = _g1h->heap_region_containing(obj); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2405 guarantee(hr != NULL, "invariant"); |
| 1044 | 2406 bool over_tams = false; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2407 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2408 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2409 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2410 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2411 over_tams = hr->obj_allocated_since_prev_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2412 marked = _g1h->isMarkedPrev(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2413 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2414 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2415 over_tams = hr->obj_allocated_since_next_marking(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2416 marked = _g1h->isMarkedNext(obj); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2417 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2418 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2419 marked = obj->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2420 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2421 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2422 ShouldNotReachHere(); |
| 1044 | 2423 } |
| 2424 | |
| 2425 if (over_tams) { | |
| 1388 | 2426 str = " >"; |
| 2427 if (marked) { | |
| 342 | 2428 str2 = " AND MARKED"; |
| 1044 | 2429 } |
| 1388 | 2430 } else if (marked) { |
| 2431 str = " M"; | |
| 1044 | 2432 } else { |
| 1388 | 2433 str = " NOT"; |
| 1044 | 2434 } |
| 342 | 2435 } |
| 2436 | |
| 1388 | 2437 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
| 342 | 2438 p, (void*) obj, str, str2); |
| 2439 } | |
| 2440 }; | |
| 2441 | |
| 1388 | 2442 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2443 private: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2444 G1CollectedHeap* _g1h; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2445 outputStream* _out; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2446 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2447 bool _all; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2448 HeapRegion* _hr; |
| 342 | 2449 |
| 2450 public: | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2451 PrintReachableObjectClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2452 VerifyOption vo, |
| 1388 | 2453 bool all, |
| 2454 HeapRegion* hr) : | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2455 _g1h(G1CollectedHeap::heap()), |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2456 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2457 |
| 2458 void do_object(oop o) { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2459 bool over_tams = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2460 bool marked = false; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2461 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2462 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2463 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2464 over_tams = _hr->obj_allocated_since_prev_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2465 marked = _g1h->isMarkedPrev(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2466 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2467 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2468 over_tams = _hr->obj_allocated_since_next_marking(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2469 marked = _g1h->isMarkedNext(o); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2470 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2471 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2472 marked = o->is_gc_marked(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2473 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2474 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2475 ShouldNotReachHere(); |
| 1388 | 2476 } |
| 2477 bool print_it = _all || over_tams || marked; | |
| 2478 | |
| 2479 if (print_it) { | |
| 2480 _out->print_cr(" "PTR_FORMAT"%s", | |
| 2481 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2482 PrintReachableOopClosure oopCl(_out, _vo, _all); |
| 1388 | 2483 o->oop_iterate(&oopCl); |
| 2484 } | |
| 342 | 2485 } |
| 2486 }; | |
| 2487 | |
| 1388 | 2488 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2489 private: |
| 2490 outputStream* _out; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2491 VerifyOption _vo; |
| 1388 | 2492 bool _all; |
| 342 | 2493 |
| 2494 public: | |
| 2495 bool doHeapRegion(HeapRegion* hr) { | |
| 2496 HeapWord* b = hr->bottom(); | |
| 2497 HeapWord* e = hr->end(); | |
| 2498 HeapWord* t = hr->top(); | |
| 1044 | 2499 HeapWord* p = NULL; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2500 |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2501 switch (_vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2502 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2503 p = hr->prev_top_at_mark_start(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2504 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2505 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2506 p = hr->next_top_at_mark_start(); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2507 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2508 case VerifyOption_G1UseMarkWord: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2509 // When we are verifying marking using the mark word |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2510 // TAMS has no relevance. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2511 assert(p == NULL, "post-condition"); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2512 break; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2513 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2514 ShouldNotReachHere(); |
| 1044 | 2515 } |
| 342 | 2516 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
| 1044 | 2517 "TAMS: "PTR_FORMAT, b, e, t, p); |
| 1388 | 2518 _out->cr(); |
| 2519 | |
| 2520 HeapWord* from = b; | |
| 2521 HeapWord* to = t; | |
| 2522 | |
| 2523 if (to > from) { | |
| 2524 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
| 2525 _out->cr(); | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2526 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2527 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2528 _out->cr(); | |
| 2529 } | |
| 342 | 2530 |
| 2531 return false; | |
| 2532 } | |
| 2533 | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2534 PrintReachableRegionClosure(outputStream* out, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2535 VerifyOption vo, |
| 1388 | 2536 bool all) : |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2537 _out(out), _vo(vo), _all(all) { } |
| 342 | 2538 }; |
| 2539 | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2540 static const char* verify_option_to_tams(VerifyOption vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2541 switch (vo) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2542 case VerifyOption_G1UsePrevMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2543 return "PTAMS"; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2544 case VerifyOption_G1UseNextMarking: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2545 return "NTAMS"; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2546 default: |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2547 return "NONE"; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2548 } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2549 } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2550 |
| 1388 | 2551 void ConcurrentMark::print_reachable(const char* str, |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
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; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2579 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
| 1044 | 2580 out->cr(); |
| 2581 | |
| 1388 | 2582 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2583 out->cr(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
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 | |
| 342 | 2594 // This note is for drainAllSATBBuffers and the code in between. |
| 2595 // In the future we could reuse a task to do this work during an | |
| 2596 // evacuation pause (since now tasks are not active and can be claimed | |
| 2597 // during an evacuation pause). This was a late change to the code and | |
| 2598 // is currently not being taken advantage of. | |
| 2599 | |
| 2600 class CMGlobalObjectClosure : public ObjectClosure { | |
| 2601 private: | |
| 2602 ConcurrentMark* _cm; | |
| 2603 | |
| 2604 public: | |
| 2605 void do_object(oop obj) { | |
| 2606 _cm->deal_with_reference(obj); | |
| 2607 } | |
| 2608 | |
| 2609 CMGlobalObjectClosure(ConcurrentMark* cm) : _cm(cm) { } | |
| 2610 }; | |
| 2611 | |
| 2612 void ConcurrentMark::deal_with_reference(oop obj) { | |
| 3771 | 2613 if (verbose_high()) { |
| 342 | 2614 gclog_or_tty->print_cr("[global] we're dealing with reference "PTR_FORMAT, |
| 2615 (void*) obj); | |
| 3771 | 2616 } |
| 342 | 2617 |
| 2618 HeapWord* objAddr = (HeapWord*) obj; | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2619 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
| 342 | 2620 if (_g1h->is_in_g1_reserved(objAddr)) { |
| 3771 | 2621 assert(obj != NULL, "null check is implicit"); |
| 2622 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
| 2623 // Only get the containing region if the object is not marked on the | |
| 2624 // bitmap (otherwise, it's a waste of time since we won't do | |
| 2625 // anything with it). | |
| 2626 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
| 2627 if (!hr->obj_allocated_since_next_marking(obj)) { | |
| 2628 if (verbose_high()) { | |
| 2629 gclog_or_tty->print_cr("[global] "PTR_FORMAT" is not considered " | |
| 2630 "marked", (void*) obj); | |
| 2631 } | |
| 2632 | |
| 2633 // we need to mark it first | |
| 2634 if (_nextMarkBitMap->parMark(objAddr)) { | |
| 2635 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 2636 // CAS done in parMark(objAddr) above | |
| 2637 HeapWord* finger = _finger; | |
| 2638 if (objAddr < finger) { | |
| 2639 if (verbose_high()) { | |
| 2640 gclog_or_tty->print_cr("[global] below the global finger " | |
| 2641 "("PTR_FORMAT"), pushing it", finger); | |
| 2642 } | |
| 2643 if (!mark_stack_push(obj)) { | |
| 2644 if (verbose_low()) { | |
| 2645 gclog_or_tty->print_cr("[global] global stack overflow during " | |
| 2646 "deal_with_reference"); | |
| 2647 } | |
| 2648 } | |
| 342 | 2649 } |
| 2650 } | |
| 2651 } | |
| 2652 } | |
| 2653 } | |
| 2654 } | |
| 2655 | |
| 2656 void ConcurrentMark::drainAllSATBBuffers() { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2657 guarantee(false, "drainAllSATBBuffers(): don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2658 |
| 342 | 2659 CMGlobalObjectClosure oc(this); |
| 2660 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 2661 satb_mq_set.set_closure(&oc); | |
| 2662 | |
| 2663 while (satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2664 if (verbose_medium()) { |
| 342 | 2665 gclog_or_tty->print_cr("[global] processed an SATB buffer"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2666 } |
| 342 | 2667 } |
| 2668 | |
| 2669 // no need to check whether we should do this, as this is only | |
| 2670 // called during an evacuation pause | |
| 2671 satb_mq_set.iterate_closure_all_threads(); | |
| 2672 | |
| 2673 satb_mq_set.set_closure(NULL); | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2674 assert(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 2675 } |
| 2676 | |
| 2677 void ConcurrentMark::clear(oop p) { | |
| 2678 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 2679 HeapWord* addr = (HeapWord*)p; | |
| 2680 assert(addr >= _nextMarkBitMap->startWord() || | |
| 2681 addr < _nextMarkBitMap->endWord(), "in a region"); | |
| 2682 | |
| 2683 _nextMarkBitMap->clear(addr); | |
| 2684 } | |
| 2685 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2686 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 2687 // Note we are overriding the read-only view of the prev map here, via |
| 2688 // the cast. | |
| 2689 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2690 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2691 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2692 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 2693 _nextMarkBitMap->clearRange(mr); |
| 2694 } | |
| 2695 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2696 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2697 clearRangePrevBitmap(mr); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2698 clearRangeNextBitmap(mr); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2699 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2700 |
| 342 | 2701 HeapRegion* |
| 2702 ConcurrentMark::claim_region(int task_num) { | |
| 2703 // "checkpoint" the finger | |
| 2704 HeapWord* finger = _finger; | |
| 2705 | |
| 2706 // _heap_end will not change underneath our feet; it only changes at | |
| 2707 // yield points. | |
| 2708 while (finger < _heap_end) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2709 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 2710 |
| 3771 | 2711 // Note on how this code handles humongous regions. In the |
| 2712 // normal case the finger will reach the start of a "starts | |
| 2713 // humongous" (SH) region. Its end will either be the end of the | |
| 2714 // last "continues humongous" (CH) region in the sequence, or the | |
| 2715 // standard end of the SH region (if the SH is the only region in | |
| 2716 // the sequence). That way claim_region() will skip over the CH | |
| 2717 // regions. However, there is a subtle race between a CM thread | |
| 2718 // executing this method and a mutator thread doing a humongous | |
| 2719 // object allocation. The two are not mutually exclusive as the CM | |
| 2720 // thread does not need to hold the Heap_lock when it gets | |
| 2721 // here. So there is a chance that claim_region() will come across | |
| 2722 // a free region that's in the progress of becoming a SH or a CH | |
| 2723 // region. In the former case, it will either | |
| 2724 // a) Miss the update to the region's end, in which case it will | |
| 2725 // visit every subsequent CH region, will find their bitmaps | |
| 2726 // empty, and do nothing, or | |
| 2727 // b) Will observe the update of the region's end (in which case | |
| 2728 // it will skip the subsequent CH regions). | |
| 2729 // If it comes across a region that suddenly becomes CH, the | |
| 2730 // scenario will be similar to b). So, the race between | |
| 2731 // claim_region() and a humongous object allocation might force us | |
| 2732 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 2733 // iterations) but it should not introduce and correctness issues. | |
| 2734 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
| 342 | 2735 HeapWord* bottom = curr_region->bottom(); |
| 2736 HeapWord* end = curr_region->end(); | |
| 2737 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 2738 | |
| 3771 | 2739 if (verbose_low()) { |
| 342 | 2740 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
| 2741 "["PTR_FORMAT", "PTR_FORMAT"), " | |
| 2742 "limit = "PTR_FORMAT, | |
| 2743 task_num, curr_region, bottom, end, limit); | |
| 3771 | 2744 } |
| 2745 | |
| 2746 // Is the gap between reading the finger and doing the CAS too long? | |
| 2747 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 342 | 2748 if (res == finger) { |
| 2749 // we succeeded | |
| 2750 | |
| 2751 // notice that _finger == end cannot be guaranteed here since, | |
| 2752 // someone else might have moved the finger even further | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2753 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 2754 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2755 if (verbose_low()) { |
| 342 | 2756 gclog_or_tty->print_cr("[%d] we were successful with region = " |
| 2757 PTR_FORMAT, task_num, curr_region); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2758 } |
| 342 | 2759 |
| 2760 if (limit > bottom) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2761 if (verbose_low()) { |
| 342 | 2762 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
| 2763 "returning it ", task_num, curr_region); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2764 } |
| 342 | 2765 return curr_region; |
| 2766 } else { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2767 assert(limit == bottom, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2768 "the region limit should be at bottom"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2769 if (verbose_low()) { |
| 342 | 2770 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
| 2771 "returning NULL", task_num, curr_region); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2772 } |
| 342 | 2773 // we return NULL and the caller should try calling |
| 2774 // claim_region() again. | |
| 2775 return NULL; | |
| 2776 } | |
| 2777 } else { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2778 assert(_finger > finger, "the finger should have moved forward"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2779 if (verbose_low()) { |
| 342 | 2780 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
| 2781 "global finger = "PTR_FORMAT", " | |
| 2782 "our finger = "PTR_FORMAT, | |
| 2783 task_num, _finger, finger); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2784 } |
| 342 | 2785 |
| 2786 // read it again | |
| 2787 finger = _finger; | |
| 2788 } | |
| 2789 } | |
| 2790 | |
| 2791 return NULL; | |
| 2792 } | |
| 2793 | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2794 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2795 guarantee(false, "invalidate_aborted_regions_in_cset(): " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2796 "don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2797 |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2798 bool result = false; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2799 for (int i = 0; i < (int)_max_task_num; ++i) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2800 CMTask* the_task = _tasks[i]; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2801 MemRegion mr = the_task->aborted_region(); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2802 if (mr.start() != NULL) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2803 assert(mr.end() != NULL, "invariant"); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2804 assert(mr.word_size() > 0, "invariant"); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2805 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2806 assert(hr != NULL, "invariant"); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2807 if (hr->in_collection_set()) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2808 // The region points into the collection set |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2809 the_task->set_aborted_region(MemRegion()); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2810 result = true; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2811 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2812 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2813 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2814 return result; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2815 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2816 |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2817 bool ConcurrentMark::has_aborted_regions() { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2818 for (int i = 0; i < (int)_max_task_num; ++i) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2819 CMTask* the_task = _tasks[i]; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2820 MemRegion mr = the_task->aborted_region(); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2821 if (mr.start() != NULL) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2822 assert(mr.end() != NULL, "invariant"); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2823 assert(mr.word_size() > 0, "invariant"); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2824 return true; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2825 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2826 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2827 return false; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2828 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2829 |
| 342 | 2830 void ConcurrentMark::oops_do(OopClosure* cl) { |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2831 if (_markStack.size() > 0 && verbose_low()) { |
| 342 | 2832 gclog_or_tty->print_cr("[global] scanning the global marking stack, " |
| 2833 "size = %d", _markStack.size()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2834 } |
| 342 | 2835 // we first iterate over the contents of the mark stack... |
| 2836 _markStack.oops_do(cl); | |
| 2837 | |
| 2838 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 2839 OopTaskQueue* queue = _task_queues->queue((int)i); | |
| 2840 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2841 if (queue->size() > 0 && verbose_low()) { |
| 342 | 2842 gclog_or_tty->print_cr("[global] scanning task queue of task %d, " |
| 2843 "size = %d", i, queue->size()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2844 } |
| 342 | 2845 |
| 2846 // ...then over the contents of the all the task queues. | |
| 2847 queue->oops_do(cl); | |
| 2848 } | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2849 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2850 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2851 #ifndef PRODUCT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2852 enum VerifyNoCSetOopsPhase { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2853 VerifyNoCSetOopsStack, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2854 VerifyNoCSetOopsQueues, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2855 VerifyNoCSetOopsSATBCompleted, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2856 VerifyNoCSetOopsSATBThread |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2857 }; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2858 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2859 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2860 private: |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2861 G1CollectedHeap* _g1h; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2862 VerifyNoCSetOopsPhase _phase; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2863 int _info; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2864 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2865 const char* phase_str() { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2866 switch (_phase) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2867 case VerifyNoCSetOopsStack: return "Stack"; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2868 case VerifyNoCSetOopsQueues: return "Queue"; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2869 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2870 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2871 default: ShouldNotReachHere(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2872 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2873 return NULL; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2874 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2875 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2876 void do_object_work(oop obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2877 guarantee(!_g1h->obj_in_cs(obj), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2878 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2879 (void*) obj, phase_str(), _info)); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2880 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2881 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2882 public: |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2883 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2884 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2885 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2886 _phase = phase; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2887 _info = info; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2888 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2889 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2890 virtual void do_oop(oop* p) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2891 oop obj = oopDesc::load_decode_heap_oop(p); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2892 do_object_work(obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2893 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2894 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2895 virtual void do_oop(narrowOop* p) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2896 // We should not come across narrow oops while scanning marking |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2897 // stacks and SATB buffers. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2898 ShouldNotReachHere(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2899 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2900 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2901 virtual void do_object(oop obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2902 do_object_work(obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2903 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2904 }; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2905 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2906 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2907 bool verify_enqueued_buffers, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2908 bool verify_thread_buffers, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2909 bool verify_fingers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2910 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2911 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2912 return; |
| 342 | 2913 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2914 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2915 VerifyNoCSetOopsClosure cl; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2916 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2917 if (verify_stacks) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2918 // Verify entries on the global mark stack |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2919 cl.set_phase(VerifyNoCSetOopsStack); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2920 _markStack.oops_do(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2921 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2922 // Verify entries on the task queues |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2923 for (int i = 0; i < (int) _max_task_num; i += 1) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2924 cl.set_phase(VerifyNoCSetOopsQueues, i); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2925 OopTaskQueue* queue = _task_queues->queue(i); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2926 queue->oops_do(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2927 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2928 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2929 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2930 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2931 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2932 // Verify entries on the enqueued SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2933 if (verify_enqueued_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2934 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2935 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2936 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2937 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2938 // Verify entries on the per-thread SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2939 if (verify_thread_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2940 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2941 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2942 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
2943 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2944 if (verify_fingers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2945 // Verify the global finger |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2946 HeapWord* global_finger = finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2947 if (global_finger != NULL && global_finger < _heap_end) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2948 // The global finger always points to a heap region boundary. We |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2949 // use heap_region_containing_raw() to get the containing region |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2950 // given that the global finger could be pointing to a free region |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2951 // which subsequently becomes continues humongous. If that |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2952 // happens, heap_region_containing() will return the bottom of the |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2953 // corresponding starts humongous region and the check below will |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2954 // not hold any more. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2955 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2956 guarantee(global_finger == global_hr->bottom(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2957 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2958 global_finger, HR_FORMAT_PARAMS(global_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2959 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2960 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2961 // Verify the task fingers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2962 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2963 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:
4783
diff
changeset
|
2964 CMTask* task = _tasks[i]; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2965 HeapWord* task_finger = task->finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2966 if (task_finger != NULL && task_finger < _heap_end) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2967 // See above note on the global finger verification. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2968 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2969 guarantee(task_finger == task_hr->bottom() || |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2970 !task_hr->in_collection_set(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2971 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2972 task_finger, HR_FORMAT_PARAMS(task_hr))); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2973 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2974 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2975 } |
| 342 | 2976 } |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2977 #endif // PRODUCT |
| 342 | 2978 |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2979 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
| 342 | 2980 _markStack.setEmpty(); |
| 2981 _markStack.clear_overflow(); | |
| 2982 _regionStack.setEmpty(); | |
| 2983 _regionStack.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
|
2984 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
|
2985 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
|
2986 } else { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2987 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
|
2988 } |
| 342 | 2989 _finger = _heap_start; |
| 2990 | |
| 2991 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 2992 OopTaskQueue* queue = _task_queues->queue(i); | |
| 2993 queue->set_empty(); | |
|
1885
a5c514e74487
6988458: G1: assert(mr.end() <= _cm->finger()) failed: otherwise the region shouldn't be on the stack
johnc
parents:
1835
diff
changeset
|
2994 // Clear any partial regions from the CMTasks |
|
a5c514e74487
6988458: G1: assert(mr.end() <= _cm->finger()) failed: otherwise the region shouldn't be on the stack
johnc
parents:
1835
diff
changeset
|
2995 _tasks[i]->clear_aborted_region(); |
| 342 | 2996 } |
| 2997 } | |
| 2998 | |
| 2999 void ConcurrentMark::print_stats() { | |
| 3000 if (verbose_stats()) { | |
| 3001 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3002 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3003 _tasks[i]->print_stats(); | |
| 3004 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3005 } | |
| 3006 } | |
| 3007 } | |
| 3008 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3009 // Closures used by ConcurrentMark::complete_marking_in_collection_set(). |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3010 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3011 class CSetMarkOopClosure: public OopClosure { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3012 friend class CSetMarkBitMapClosure; |
| 342 | 3013 |
| 3014 G1CollectedHeap* _g1h; | |
| 3015 CMBitMap* _bm; | |
| 3016 ConcurrentMark* _cm; | |
| 3017 oop* _ms; | |
| 3018 jint* _array_ind_stack; | |
| 3019 int _ms_size; | |
| 3020 int _ms_ind; | |
| 3021 int _array_increment; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3022 uint _worker_id; |
| 342 | 3023 |
| 3024 bool push(oop obj, int arr_ind = 0) { | |
| 3025 if (_ms_ind == _ms_size) { | |
| 3026 gclog_or_tty->print_cr("Mark stack is full."); | |
| 3027 return false; | |
| 3028 } | |
| 3029 _ms[_ms_ind] = obj; | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3030 if (obj->is_objArray()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3031 _array_ind_stack[_ms_ind] = arr_ind; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3032 } |
| 342 | 3033 _ms_ind++; |
| 3034 return true; | |
| 3035 } | |
| 3036 | |
| 3037 oop pop() { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3038 if (_ms_ind == 0) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3039 return NULL; |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3040 } else { |
| 342 | 3041 _ms_ind--; |
| 3042 return _ms[_ms_ind]; | |
| 3043 } | |
| 3044 } | |
| 3045 | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3046 template <class T> bool drain() { |
| 342 | 3047 while (_ms_ind > 0) { |
| 3048 oop obj = pop(); | |
| 3049 assert(obj != NULL, "Since index was non-zero."); | |
| 3050 if (obj->is_objArray()) { | |
| 3051 jint arr_ind = _array_ind_stack[_ms_ind]; | |
| 3052 objArrayOop aobj = objArrayOop(obj); | |
| 3053 jint len = aobj->length(); | |
| 3054 jint next_arr_ind = arr_ind + _array_increment; | |
| 3055 if (next_arr_ind < len) { | |
| 3056 push(obj, next_arr_ind); | |
| 3057 } | |
| 3058 // Now process this portion of this one. | |
| 3059 int lim = MIN2(next_arr_ind, len); | |
| 3060 for (int j = arr_ind; j < lim; j++) { | |
|
912
308762b2bf14
6872000: G1: compilation fails on linux/older gcc
apetrusenko
parents:
866
diff
changeset
|
3061 do_oop(aobj->objArrayOopDesc::obj_at_addr<T>(j)); |
| 342 | 3062 } |
| 3063 } else { | |
| 3064 obj->oop_iterate(this); | |
| 3065 } | |
| 3066 if (abort()) return false; | |
| 3067 } | |
| 3068 return true; | |
| 3069 } | |
| 3070 | |
| 3071 public: | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3072 CSetMarkOopClosure(ConcurrentMark* cm, int ms_size, uint worker_id) : |
| 342 | 3073 _g1h(G1CollectedHeap::heap()), |
| 3074 _cm(cm), | |
| 3075 _bm(cm->nextMarkBitMap()), | |
| 3076 _ms_size(ms_size), _ms_ind(0), | |
| 3077 _ms(NEW_C_HEAP_ARRAY(oop, ms_size)), | |
| 3078 _array_ind_stack(NEW_C_HEAP_ARRAY(jint, ms_size)), | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3079 _array_increment(MAX2(ms_size/8, 16)), |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3080 _worker_id(worker_id) { } |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3081 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3082 ~CSetMarkOopClosure() { |
| 342 | 3083 FREE_C_HEAP_ARRAY(oop, _ms); |
| 3084 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
| 3085 } | |
| 3086 | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3087 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3088 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3089 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3090 template <class T> void do_oop_work(T* p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3091 T heap_oop = oopDesc::load_heap_oop(p); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3092 if (oopDesc::is_null(heap_oop)) return; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3093 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 342 | 3094 if (obj->is_forwarded()) { |
| 3095 // If the object has already been forwarded, we have to make sure | |
| 3096 // that it's marked. So follow the forwarding pointer. Note that | |
| 3097 // this does the right thing for self-forwarding pointers in the | |
| 3098 // evacuation failure case. | |
| 3099 obj = obj->forwardee(); | |
| 3100 } | |
| 3101 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
| 3102 if (hr != NULL) { | |
| 3103 if (hr->in_collection_set()) { | |
| 3104 if (_g1h->is_obj_ill(obj)) { | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3105 if (_bm->parMark((HeapWord*)obj)) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3106 if (!push(obj)) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3107 gclog_or_tty->print_cr("Setting abort in CSetMarkOopClosure because push failed."); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3108 set_abort(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3109 } |
| 342 | 3110 } |
| 3111 } | |
| 3112 } else { | |
| 3113 // Outside the collection set; we need to gray it | |
| 3114 _cm->deal_with_reference(obj); | |
| 3115 } | |
| 3116 } | |
| 3117 } | |
| 3118 }; | |
| 3119 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3120 class CSetMarkBitMapClosure: public BitMapClosure { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3121 G1CollectedHeap* _g1h; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3122 CMBitMap* _bitMap; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3123 ConcurrentMark* _cm; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3124 CSetMarkOopClosure _oop_cl; |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3125 uint _worker_id; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3126 |
| 342 | 3127 public: |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3128 CSetMarkBitMapClosure(ConcurrentMark* cm, int ms_size, int worker_id) : |
| 342 | 3129 _g1h(G1CollectedHeap::heap()), |
| 3130 _bitMap(cm->nextMarkBitMap()), | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3131 _oop_cl(cm, ms_size, worker_id), |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3132 _worker_id(worker_id) { } |
| 342 | 3133 |
| 3134 bool do_bit(size_t offset) { | |
| 3135 // convert offset into a HeapWord* | |
| 3136 HeapWord* addr = _bitMap->offsetToHeapWord(offset); | |
| 3137 assert(_bitMap->endWord() && addr < _bitMap->endWord(), | |
| 3138 "address out of range"); | |
| 3139 assert(_bitMap->isMarked(addr), "tautology"); | |
| 3140 oop obj = oop(addr); | |
| 3141 if (!obj->is_forwarded()) { | |
| 3142 if (!_oop_cl.push(obj)) return false; | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3143 if (UseCompressedOops) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3144 if (!_oop_cl.drain<narrowOop>()) return false; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3145 } else { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3146 if (!_oop_cl.drain<oop>()) return false; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3147 } |
| 342 | 3148 } |
| 3149 // Otherwise... | |
| 3150 return true; | |
| 3151 } | |
| 3152 }; | |
| 3153 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3154 class CompleteMarkingInCSetHRClosure: public HeapRegionClosure { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3155 CMBitMap* _bm; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3156 CSetMarkBitMapClosure _bit_cl; |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3157 uint _worker_id; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3158 |
| 342 | 3159 enum SomePrivateConstants { |
| 3160 MSSize = 1000 | |
| 3161 }; | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3162 |
| 342 | 3163 public: |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3164 CompleteMarkingInCSetHRClosure(ConcurrentMark* cm, int worker_id) : |
| 342 | 3165 _bm(cm->nextMarkBitMap()), |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3166 _bit_cl(cm, MSSize, worker_id), |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3167 _worker_id(worker_id) { } |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3168 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3169 bool doHeapRegion(HeapRegion* hr) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3170 if (hr->claimHeapRegion(HeapRegion::CompleteMarkCSetClaimValue)) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3171 // The current worker has successfully claimed the region. |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3172 if (!hr->evacuation_failed()) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3173 MemRegion mr = MemRegion(hr->bottom(), hr->next_top_at_mark_start()); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3174 if (!mr.is_empty()) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3175 bool done = false; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3176 while (!done) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3177 done = _bm->iterate(&_bit_cl, mr); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3178 } |
| 342 | 3179 } |
| 3180 } | |
| 3181 } | |
| 3182 return false; | |
| 3183 } | |
| 3184 }; | |
| 3185 | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3186 class G1ParCompleteMarkInCSetTask: public AbstractGangTask { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3187 protected: |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3188 G1CollectedHeap* _g1h; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3189 ConcurrentMark* _cm; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3190 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3191 public: |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3192 G1ParCompleteMarkInCSetTask(G1CollectedHeap* g1h, |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3193 ConcurrentMark* cm) : |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3194 AbstractGangTask("Complete Mark in CSet"), |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3195 _g1h(g1h), _cm(cm) { } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3196 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3197 void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3198 CompleteMarkingInCSetHRClosure cmplt(_cm, worker_id); |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3199 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id); |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3200 _g1h->collection_set_iterate_from(hr, &cmplt); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3201 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3202 }; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3203 |
| 342 | 3204 void ConcurrentMark::complete_marking_in_collection_set() { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3205 guarantee(false, "complete_marking_in_collection_set(): " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3206 "don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3207 |
| 342 | 3208 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 3209 | |
| 3210 if (!g1h->mark_in_progress()) { | |
| 3211 g1h->g1_policy()->record_mark_closure_time(0.0); | |
| 3212 return; | |
| 3213 } | |
| 3214 | |
| 3215 double start = os::elapsedTime(); | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3216 G1ParCompleteMarkInCSetTask complete_mark_task(g1h, this); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3217 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3218 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3219 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3220 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 4711 | 3221 int n_workers = g1h->workers()->active_workers(); |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3222 g1h->set_par_threads(n_workers); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3223 g1h->workers()->run_task(&complete_mark_task); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3224 g1h->set_par_threads(0); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3225 } else { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3226 complete_mark_task.work(0); |
| 342 | 3227 } |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
3228 |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3229 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::CompleteMarkCSetClaimValue), "sanity"); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3230 |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4735
diff
changeset
|
3231 // Reset the claim values in the regions in the collection set. |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4735
diff
changeset
|
3232 g1h->reset_cset_heap_region_claim_values(); |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3233 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
3234 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
3235 |
| 342 | 3236 double end_time = os::elapsedTime(); |
| 3237 double elapsed_time_ms = (end_time - start) * 1000.0; | |
| 3238 g1h->g1_policy()->record_mark_closure_time(elapsed_time_ms); | |
| 3239 } | |
| 3240 | |
| 3241 // The next two methods deal with the following optimisation. Some | |
| 3242 // objects are gray by being marked and located above the finger. If | |
| 3243 // they are copied, during an evacuation pause, below the finger then | |
| 3244 // the need to be pushed on the stack. The observation is that, if | |
| 3245 // there are no regions in the collection set located above the | |
| 3246 // finger, then the above cannot happen, hence we do not need to | |
| 3247 // explicitly gray any objects when copying them to below the | |
| 3248 // finger. The global stack will be scanned to ensure that, if it | |
| 3249 // points to objects being copied, it will update their | |
| 3250 // location. There is a tricky situation with the gray objects in | |
| 3251 // region stack that are being coped, however. See the comment in | |
| 3252 // newCSet(). | |
| 3253 | |
| 3254 void ConcurrentMark::newCSet() { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3255 guarantee(false, "newCSet(): don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3256 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3257 if (!concurrent_marking_in_progress()) { |
| 342 | 3258 // nothing to do if marking is not in progress |
| 3259 return; | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3260 } |
| 342 | 3261 |
| 3262 // find what the lowest finger is among the global and local fingers | |
| 3263 _min_finger = _finger; | |
| 3264 for (int i = 0; i < (int)_max_task_num; ++i) { | |
| 3265 CMTask* task = _tasks[i]; | |
| 3266 HeapWord* task_finger = task->finger(); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3267 if (task_finger != NULL && task_finger < _min_finger) { |
| 342 | 3268 _min_finger = task_finger; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3269 } |
| 342 | 3270 } |
| 3271 | |
| 3272 _should_gray_objects = false; | |
| 3273 | |
| 3274 // This fixes a very subtle and fustrating bug. It might be the case | |
| 3275 // that, during en evacuation pause, heap regions that contain | |
| 3276 // objects that are gray (by being in regions contained in the | |
| 3277 // region stack) are included in the collection set. Since such gray | |
| 3278 // objects will be moved, and because it's not easy to redirect | |
| 3279 // region stack entries to point to a new location (because objects | |
| 3280 // in one region might be scattered to multiple regions after they | |
| 3281 // are copied), one option is to ensure that all marked objects | |
| 3282 // copied during a pause are pushed on the stack. Notice, however, | |
| 3283 // that this problem can only happen when the region stack is not | |
| 3284 // empty during an evacuation pause. So, we make the fix a bit less | |
| 3285 // conservative and ensure that regions are pushed on the stack, | |
| 3286 // irrespective whether all collection set regions are below the | |
| 3287 // finger, if the region stack is not empty. This is expected to be | |
| 3288 // a rare case, so I don't think it's necessary to be smarted about it. | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3289 if (!region_stack_empty() || has_aborted_regions()) { |
| 342 | 3290 _should_gray_objects = true; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3291 } |
| 342 | 3292 } |
| 3293 | |
| 3294 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3295 guarantee(false, "registerCSetRegion(): don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3296 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3297 if (!concurrent_marking_in_progress()) return; |
| 342 | 3298 |
| 3299 HeapWord* region_end = hr->end(); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3300 if (region_end > _min_finger) { |
| 342 | 3301 _should_gray_objects = true; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3302 } |
| 342 | 3303 } |
| 3304 | |
|
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3305 // Resets the region fields of active CMTasks whose values point |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3306 // into the collection set. |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3307 void ConcurrentMark::reset_active_task_region_fields_in_cset() { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3308 guarantee(false, "reset_active_task_region_fields_in_cset(): " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3309 "don't call this any more"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3310 |
|
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3311 assert(SafepointSynchronize::is_at_safepoint(), "should be in STW"); |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3312 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3313 |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3314 for (int i = 0; i < (int)parallel_marking_threads(); i += 1) { |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3315 CMTask* task = _tasks[i]; |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3316 HeapWord* task_finger = task->finger(); |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3317 if (task_finger != NULL) { |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3318 assert(_g1h->is_in_g1_reserved(task_finger), "not in heap"); |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3319 HeapRegion* finger_region = _g1h->heap_region_containing(task_finger); |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3320 if (finger_region->in_collection_set()) { |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3321 // The task's current region is in the collection set. |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3322 // This region will be evacuated in the current GC and |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3323 // the region fields in the task will be stale. |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3324 task->giveup_current_region(); |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3325 } |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3326 } |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3327 } |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3328 } |
|
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3329 |
| 342 | 3330 // abandon current marking iteration due to a Full GC |
| 3331 void ConcurrentMark::abort() { | |
| 3332 // Clear all marks to force marking thread to do nothing | |
| 3333 _nextMarkBitMap->clearAll(); | |
| 3334 // Empty mark stack | |
| 3335 clear_marking_state(); | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3336 for (int i = 0; i < (int)_max_task_num; ++i) { |
| 342 | 3337 _tasks[i]->clear_region_fields(); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3338 } |
| 342 | 3339 _has_aborted = true; |
| 3340 | |
| 3341 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3342 satb_mq_set.abandon_partial_marking(); | |
|
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3343 // This can be called either during or outside marking, we'll read |
|
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3344 // the expected_active value from the SATB queue set. |
|
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3345 satb_mq_set.set_active_all_threads( |
|
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3346 false, /* new active value */ |
|
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3347 satb_mq_set.is_active() /* expected_active */); |
| 342 | 3348 } |
| 3349 | |
| 3350 static void print_ms_time_info(const char* prefix, const char* name, | |
| 3351 NumberSeq& ns) { | |
| 3352 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3353 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3354 if (ns.num() > 0) { | |
| 3355 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3356 prefix, ns.sd(), ns.maximum()); | |
| 3357 } | |
| 3358 } | |
| 3359 | |
| 3360 void ConcurrentMark::print_summary_info() { | |
| 3361 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3362 print_ms_time_info(" ", "init marks", _init_times); | |
| 3363 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3364 { | |
| 3365 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3366 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3367 | |
| 3368 } | |
| 3369 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3370 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3371 _total_counting_time, | |
| 3372 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3373 (double)_cleanup_times.num() | |
| 3374 : 0.0)); | |
| 3375 if (G1ScrubRemSets) { | |
| 3376 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3377 _total_rs_scrub_time, | |
| 3378 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3379 (double)_cleanup_times.num() | |
| 3380 : 0.0)); | |
| 3381 } | |
| 3382 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3383 (_init_times.sum() + _remark_times.sum() + | |
| 3384 _cleanup_times.sum())/1000.0); | |
| 3385 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
| 3386 "(%8.2f s marking, %8.2f s counting).", | |
| 3387 cmThread()->vtime_accum(), | |
| 3388 cmThread()->vtime_mark_accum(), | |
| 3389 cmThread()->vtime_count_accum()); | |
| 3390 } | |
| 3391 | |
| 1019 | 3392 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
| 3393 _parallel_workers->print_worker_threads_on(st); | |
| 3394 } | |
| 3395 | |
| 342 | 3396 // We take a break if someone is trying to stop the world. |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3397 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 342 | 3398 if (should_yield()) { |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3399 if (worker_id == 0) { |
| 342 | 3400 _g1h->g1_policy()->record_concurrent_pause(); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3401 } |
| 342 | 3402 cmThread()->yield(); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
3403 if (worker_id == 0) { |
| 342 | 3404 _g1h->g1_policy()->record_concurrent_pause_end(); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3405 } |
| 342 | 3406 return true; |
| 3407 } else { | |
| 3408 return false; | |
| 3409 } | |
| 3410 } | |
| 3411 | |
| 3412 bool ConcurrentMark::should_yield() { | |
| 3413 return cmThread()->should_yield(); | |
| 3414 } | |
| 3415 | |
| 3416 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 3417 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 3418 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 3419 } | |
| 3420 | |
| 3421 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 3422 void* last) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3423 return containing_card_is_marked(start) && |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3424 containing_card_is_marked(last); |
| 342 | 3425 } |
| 3426 | |
| 3427 #ifndef PRODUCT | |
| 3428 // for debugging purposes | |
| 3429 void ConcurrentMark::print_finger() { | |
| 3430 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
| 3431 _heap_start, _heap_end, _finger); | |
| 3432 for (int i = 0; i < (int) _max_task_num; ++i) { | |
| 3433 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
| 3434 } | |
| 3435 gclog_or_tty->print_cr(""); | |
| 3436 } | |
| 3437 #endif | |
| 3438 | |
| 3771 | 3439 void CMTask::scan_object(oop obj) { |
| 3440 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3441 | |
| 3442 if (_cm->verbose_high()) { | |
| 3443 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
| 3444 _task_id, (void*) obj); | |
| 3445 } | |
| 3446 | |
| 3447 size_t obj_size = obj->size(); | |
| 3448 _words_scanned += obj_size; | |
| 3449 | |
| 3450 obj->oop_iterate(_cm_oop_closure); | |
| 3451 statsOnly( ++_objs_scanned ); | |
| 3452 check_limits(); | |
| 3453 } | |
| 3454 | |
| 342 | 3455 // Closure for iteration over bitmaps |
| 3456 class CMBitMapClosure : public BitMapClosure { | |
| 3457 private: | |
| 3458 // the bitmap that is being iterated over | |
| 3459 CMBitMap* _nextMarkBitMap; | |
| 3460 ConcurrentMark* _cm; | |
| 3461 CMTask* _task; | |
| 3462 // true if we're scanning a heap region claimed by the task (so that | |
| 3463 // we move the finger along), false if we're not, i.e. currently when | |
| 3464 // scanning a heap region popped from the region stack (so that we | |
| 3465 // do not move the task finger along; it'd be a mistake if we did so). | |
| 3466 bool _scanning_heap_region; | |
| 3467 | |
| 3468 public: | |
| 3469 CMBitMapClosure(CMTask *task, | |
| 3470 ConcurrentMark* cm, | |
| 3471 CMBitMap* nextMarkBitMap) | |
| 3472 : _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } | |
| 3473 | |
| 3474 void set_scanning_heap_region(bool scanning_heap_region) { | |
| 3475 _scanning_heap_region = scanning_heap_region; | |
| 3476 } | |
| 3477 | |
| 3478 bool do_bit(size_t offset) { | |
| 3479 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3480 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3481 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3482 |
| 3483 if (_scanning_heap_region) { | |
| 3484 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3485 assert(addr >= _task->finger(), "invariant"); |
| 342 | 3486 // We move that task's local finger along. |
| 3487 _task->move_finger_to(addr); | |
| 3488 } else { | |
| 3489 // We move the task's region finger along. | |
| 3490 _task->move_region_finger_to(addr); | |
| 3491 } | |
| 3492 | |
| 3493 _task->scan_object(oop(addr)); | |
| 3494 // we only partially drain the local queue and global stack | |
| 3495 _task->drain_local_queue(true); | |
| 3496 _task->drain_global_stack(true); | |
| 3497 | |
| 3498 // if the has_aborted flag has been raised, we need to bail out of | |
| 3499 // the iteration | |
| 3500 return !_task->has_aborted(); | |
| 3501 } | |
| 3502 }; | |
| 3503 | |
| 3504 // Closure for iterating over objects, currently only used for | |
| 3505 // processing SATB buffers. | |
| 3506 class CMObjectClosure : public ObjectClosure { | |
| 3507 private: | |
| 3508 CMTask* _task; | |
| 3509 | |
| 3510 public: | |
| 3511 void do_object(oop obj) { | |
| 3512 _task->deal_with_reference(obj); | |
| 3513 } | |
| 3514 | |
| 3515 CMObjectClosure(CMTask* task) : _task(task) { } | |
| 3516 }; | |
| 3517 | |
| 3771 | 3518 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 3519 ConcurrentMark* cm, | |
| 3520 CMTask* task) | |
| 3521 : _g1h(g1h), _cm(cm), _task(task) { | |
| 3522 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 3523 | |
| 3524 if (G1UseConcMarkReferenceProcessing) { | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
3525 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 3526 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 3527 } |
| 3771 | 3528 } |
| 342 | 3529 |
| 3530 void CMTask::setup_for_region(HeapRegion* hr) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3531 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3532 assert(hr != NULL, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3533 "claim_region() should have filtered out continues humongous regions"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3534 assert(!hr->continuesHumongous(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3535 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 3536 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3537 if (_cm->verbose_low()) { |
| 342 | 3538 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
| 3539 _task_id, hr); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3540 } |
| 342 | 3541 |
| 3542 _curr_region = hr; | |
| 3543 _finger = hr->bottom(); | |
| 3544 update_region_limit(); | |
| 3545 } | |
| 3546 | |
| 3547 void CMTask::update_region_limit() { | |
| 3548 HeapRegion* hr = _curr_region; | |
| 3549 HeapWord* bottom = hr->bottom(); | |
| 3550 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 3551 | |
| 3552 if (limit == bottom) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3553 if (_cm->verbose_low()) { |
| 342 | 3554 gclog_or_tty->print_cr("[%d] found an empty region " |
| 3555 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 3556 _task_id, bottom, limit); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3557 } |
| 342 | 3558 // The region was collected underneath our feet. |
| 3559 // We set the finger to bottom to ensure that the bitmap | |
| 3560 // iteration that will follow this will not do anything. | |
| 3561 // (this is not a condition that holds when we set the region up, | |
| 3562 // as the region is not supposed to be empty in the first place) | |
| 3563 _finger = bottom; | |
| 3564 } else if (limit >= _region_limit) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3565 assert(limit >= _finger, "peace of mind"); |
| 342 | 3566 } else { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3567 assert(limit < _region_limit, "only way to get here"); |
| 342 | 3568 // This can happen under some pretty unusual circumstances. An |
| 3569 // evacuation pause empties the region underneath our feet (NTAMS | |
| 3570 // at bottom). We then do some allocation in the region (NTAMS | |
| 3571 // stays at bottom), followed by the region being used as a GC | |
| 3572 // alloc region (NTAMS will move to top() and the objects | |
| 3573 // originally below it will be grayed). All objects now marked in | |
| 3574 // the region are explicitly grayed, if below the global finger, | |
| 3575 // and we do not need in fact to scan anything else. So, we simply | |
| 3576 // set _finger to be limit to ensure that the bitmap iteration | |
| 3577 // doesn't do anything. | |
| 3578 _finger = limit; | |
| 3579 } | |
| 3580 | |
| 3581 _region_limit = limit; | |
| 3582 } | |
| 3583 | |
| 3584 void CMTask::giveup_current_region() { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3585 assert(_curr_region != NULL, "invariant"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3586 if (_cm->verbose_low()) { |
| 342 | 3587 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
| 3588 _task_id, _curr_region); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3589 } |
| 342 | 3590 clear_region_fields(); |
| 3591 } | |
| 3592 | |
| 3593 void CMTask::clear_region_fields() { | |
| 3594 // Values for these three fields that indicate that we're not | |
| 3595 // holding on to a region. | |
| 3596 _curr_region = NULL; | |
| 3597 _finger = NULL; | |
| 3598 _region_limit = NULL; | |
| 3599 | |
| 3600 _region_finger = NULL; | |
| 3601 } | |
| 3602 | |
| 3771 | 3603 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 3604 if (cm_oop_closure == NULL) { | |
| 3605 assert(_cm_oop_closure != NULL, "invariant"); | |
| 3606 } else { | |
| 3607 assert(_cm_oop_closure == NULL, "invariant"); | |
| 3608 } | |
| 3609 _cm_oop_closure = cm_oop_closure; | |
| 3610 } | |
| 3611 | |
| 342 | 3612 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3613 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 3614 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3615 if (_cm->verbose_low()) { |
| 342 | 3616 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3617 } |
| 342 | 3618 |
| 3619 _nextMarkBitMap = nextMarkBitMap; | |
| 3620 clear_region_fields(); | |
|
1885
a5c514e74487
6988458: G1: assert(mr.end() <= _cm->finger()) failed: otherwise the region shouldn't be on the stack
johnc
parents:
1835
diff
changeset
|
3621 assert(_aborted_region.is_empty(), "should have been cleared"); |
| 342 | 3622 |
| 3623 _calls = 0; | |
| 3624 _elapsed_time_ms = 0.0; | |
| 3625 _termination_time_ms = 0.0; | |
| 3626 _termination_start_time_ms = 0.0; | |
| 3627 | |
| 3628 #if _MARKING_STATS_ | |
| 3629 _local_pushes = 0; | |
| 3630 _local_pops = 0; | |
| 3631 _local_max_size = 0; | |
| 3632 _objs_scanned = 0; | |
| 3633 _global_pushes = 0; | |
| 3634 _global_pops = 0; | |
| 3635 _global_max_size = 0; | |
| 3636 _global_transfers_to = 0; | |
| 3637 _global_transfers_from = 0; | |
| 3638 _region_stack_pops = 0; | |
| 3639 _regions_claimed = 0; | |
| 3640 _objs_found_on_bitmap = 0; | |
| 3641 _satb_buffers_processed = 0; | |
| 3642 _steal_attempts = 0; | |
| 3643 _steals = 0; | |
| 3644 _aborted = 0; | |
| 3645 _aborted_overflow = 0; | |
| 3646 _aborted_cm_aborted = 0; | |
| 3647 _aborted_yield = 0; | |
| 3648 _aborted_timed_out = 0; | |
| 3649 _aborted_satb = 0; | |
| 3650 _aborted_termination = 0; | |
| 3651 #endif // _MARKING_STATS_ | |
| 3652 } | |
| 3653 | |
| 3654 bool CMTask::should_exit_termination() { | |
| 3655 regular_clock_call(); | |
| 3656 // This is called when we are in the termination protocol. We should | |
| 3657 // quit if, for some reason, this task wants to abort or the global | |
| 3658 // stack is not empty (this means that we can get work from it). | |
| 3659 return !_cm->mark_stack_empty() || has_aborted(); | |
| 3660 } | |
| 3661 | |
| 3662 void CMTask::reached_limit() { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3663 assert(_words_scanned >= _words_scanned_limit || |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3664 _refs_reached >= _refs_reached_limit , |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3665 "shouldn't have been called otherwise"); |
| 342 | 3666 regular_clock_call(); |
| 3667 } | |
| 3668 | |
| 3669 void CMTask::regular_clock_call() { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3670 if (has_aborted()) return; |
| 342 | 3671 |
| 3672 // First, we need to recalculate the words scanned and refs reached | |
| 3673 // limits for the next clock call. | |
| 3674 recalculate_limits(); | |
| 3675 | |
| 3676 // During the regular clock call we do the following | |
| 3677 | |
| 3678 // (1) If an overflow has been flagged, then we abort. | |
| 3679 if (_cm->has_overflown()) { | |
| 3680 set_has_aborted(); | |
| 3681 return; | |
| 3682 } | |
| 3683 | |
| 3684 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 3685 // to check anything else. The other steps are only needed during | |
| 3686 // the concurrent marking phase. | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3687 if (!concurrent()) return; |
| 342 | 3688 |
| 3689 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 3690 if (_cm->has_aborted()) { | |
| 3691 set_has_aborted(); | |
| 3692 statsOnly( ++_aborted_cm_aborted ); | |
| 3693 return; | |
| 3694 } | |
| 3695 | |
| 3696 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 3697 | |
| 3698 // (3) If marking stats are enabled, then we update the step history. | |
| 3699 #if _MARKING_STATS_ | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3700 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 3701 ++_clock_due_to_scanning; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3702 } |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3703 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 3704 ++_clock_due_to_marking; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3705 } |
| 342 | 3706 |
| 3707 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 3708 _interval_start_time_ms = curr_time_ms; | |
| 3709 _all_clock_intervals_ms.add(last_interval_ms); | |
| 3710 | |
| 3711 if (_cm->verbose_medium()) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3712 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3713 "scanned = %d%s, refs reached = %d%s", |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3714 _task_id, last_interval_ms, |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3715 _words_scanned, |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3716 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3717 _refs_reached, |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3718 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 3719 } |
| 3720 #endif // _MARKING_STATS_ | |
| 3721 | |
| 3722 // (4) We check whether we should yield. If we have to, then we abort. | |
| 3723 if (_cm->should_yield()) { | |
| 3724 // We should yield. To do this we abort the task. The caller is | |
| 3725 // responsible for yielding. | |
| 3726 set_has_aborted(); | |
| 3727 statsOnly( ++_aborted_yield ); | |
| 3728 return; | |
| 3729 } | |
| 3730 | |
| 3731 // (5) We check whether we've reached our time quota. If we have, | |
| 3732 // then we abort. | |
| 3733 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 3734 if (elapsed_time_ms > _time_target_ms) { | |
| 3735 set_has_aborted(); | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
3736 _has_timed_out = true; |
| 342 | 3737 statsOnly( ++_aborted_timed_out ); |
| 3738 return; | |
| 3739 } | |
| 3740 | |
| 3741 // (6) Finally, we check whether there are enough completed STAB | |
| 3742 // buffers available for processing. If there are, we abort. | |
| 3743 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3744 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3745 if (_cm->verbose_low()) { |
| 342 | 3746 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
| 3747 _task_id); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3748 } |
| 342 | 3749 // we do need to process SATB buffers, we'll abort and restart |
| 3750 // the marking task to do so | |
| 3751 set_has_aborted(); | |
| 3752 statsOnly( ++_aborted_satb ); | |
| 3753 return; | |
| 3754 } | |
| 3755 } | |
| 3756 | |
| 3757 void CMTask::recalculate_limits() { | |
| 3758 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 3759 _words_scanned_limit = _real_words_scanned_limit; | |
| 3760 | |
| 3761 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 3762 _refs_reached_limit = _real_refs_reached_limit; | |
| 3763 } | |
| 3764 | |
| 3765 void CMTask::decrease_limits() { | |
| 3766 // This is called when we believe that we're going to do an infrequent | |
| 3767 // operation which will increase the per byte scanned cost (i.e. move | |
| 3768 // entries to/from the global stack). It basically tries to decrease the | |
| 3769 // scanning limit so that the clock is called earlier. | |
| 3770 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3771 if (_cm->verbose_medium()) { |
| 342 | 3772 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3773 } |
| 342 | 3774 |
| 3775 _words_scanned_limit = _real_words_scanned_limit - | |
| 3776 3 * words_scanned_period / 4; | |
| 3777 _refs_reached_limit = _real_refs_reached_limit - | |
| 3778 3 * refs_reached_period / 4; | |
| 3779 } | |
| 3780 | |
| 3781 void CMTask::move_entries_to_global_stack() { | |
| 3782 // local array where we'll store the entries that will be popped | |
| 3783 // from the local queue | |
| 3784 oop buffer[global_stack_transfer_size]; | |
| 3785 | |
| 3786 int n = 0; | |
| 3787 oop obj; | |
| 3788 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 3789 buffer[n] = obj; | |
| 3790 ++n; | |
| 3791 } | |
| 3792 | |
| 3793 if (n > 0) { | |
| 3794 // we popped at least one entry from the local queue | |
| 3795 | |
| 3796 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 3797 | |
| 3798 if (!_cm->mark_stack_push(buffer, n)) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3799 if (_cm->verbose_low()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3800 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3801 _task_id); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3802 } |
| 342 | 3803 set_has_aborted(); |
| 3804 } else { | |
| 3805 // the transfer was successful | |
| 3806 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3807 if (_cm->verbose_medium()) { |
| 342 | 3808 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
| 3809 _task_id, n); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3810 } |
| 342 | 3811 statsOnly( int tmp_size = _cm->mark_stack_size(); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3812 if (tmp_size > _global_max_size) { |
| 342 | 3813 _global_max_size = tmp_size; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3814 } |
| 342 | 3815 _global_pushes += n ); |
| 3816 } | |
| 3817 } | |
| 3818 | |
| 3819 // this operation was quite expensive, so decrease the limits | |
| 3820 decrease_limits(); | |
| 3821 } | |
| 3822 | |
| 3823 void CMTask::get_entries_from_global_stack() { | |
| 3824 // local array where we'll store the entries that will be popped | |
| 3825 // from the global stack. | |
| 3826 oop buffer[global_stack_transfer_size]; | |
| 3827 int n; | |
| 3828 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3829 assert(n <= global_stack_transfer_size, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3830 "we should not pop more than the given limit"); |
| 342 | 3831 if (n > 0) { |
| 3832 // yes, we did actually pop at least one entry | |
| 3833 | |
| 3834 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3835 if (_cm->verbose_medium()) { |
| 342 | 3836 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
| 3837 _task_id, n); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3838 } |
| 342 | 3839 for (int i = 0; i < n; ++i) { |
| 3840 bool success = _task_queue->push(buffer[i]); | |
| 3841 // We only call this when the local queue is empty or under a | |
| 3842 // given target limit. So, we do not expect this push to fail. | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3843 assert(success, "invariant"); |
| 342 | 3844 } |
| 3845 | |
| 3846 statsOnly( int tmp_size = _task_queue->size(); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3847 if (tmp_size > _local_max_size) { |
| 342 | 3848 _local_max_size = tmp_size; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3849 } |
| 342 | 3850 _local_pushes += n ); |
| 3851 } | |
| 3852 | |
| 3853 // this operation was quite expensive, so decrease the limits | |
| 3854 decrease_limits(); | |
| 3855 } | |
| 3856 | |
| 3857 void CMTask::drain_local_queue(bool partially) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3858 if (has_aborted()) return; |
| 342 | 3859 |
| 3860 // Decide what the target size is, depending whether we're going to | |
| 3861 // drain it partially (so that other tasks can steal if they run out | |
| 3862 // of things to do) or totally (at the very end). | |
| 3863 size_t target_size; | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3864 if (partially) { |
| 342 | 3865 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3866 } else { |
| 342 | 3867 target_size = 0; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3868 } |
| 342 | 3869 |
| 3870 if (_task_queue->size() > target_size) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3871 if (_cm->verbose_high()) { |
| 342 | 3872 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
| 3873 _task_id, target_size); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3874 } |
| 342 | 3875 |
| 3876 oop obj; | |
| 3877 bool ret = _task_queue->pop_local(obj); | |
| 3878 while (ret) { | |
| 3879 statsOnly( ++_local_pops ); | |
| 3880 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3881 if (_cm->verbose_high()) { |
| 342 | 3882 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
| 3883 (void*) obj); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3884 } |
| 342 | 3885 |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3886 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 3887 assert(!_g1h->is_on_master_free_list( |
| 2152 | 3888 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 3889 |
| 3890 scan_object(obj); | |
| 3891 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3892 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 3893 ret = false; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3894 } else { |
| 342 | 3895 ret = _task_queue->pop_local(obj); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3896 } |
| 342 | 3897 } |
| 3898 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3899 if (_cm->verbose_high()) { |
| 342 | 3900 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
| 3901 _task_id, _task_queue->size()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3902 } |
| 342 | 3903 } |
| 3904 } | |
| 3905 | |
| 3906 void CMTask::drain_global_stack(bool partially) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3907 if (has_aborted()) return; |
| 342 | 3908 |
| 3909 // We have a policy to drain the local queue before we attempt to | |
| 3910 // drain the global stack. | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3911 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 3912 |
| 3913 // Decide what the target size is, depending whether we're going to | |
| 3914 // drain it partially (so that other tasks can steal if they run out | |
| 3915 // of things to do) or totally (at the very end). Notice that, | |
| 3916 // because we move entries from the global stack in chunks or | |
| 3917 // because another task might be doing the same, we might in fact | |
| 3918 // drop below the target. But, this is not a problem. | |
| 3919 size_t target_size; | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3920 if (partially) { |
| 342 | 3921 target_size = _cm->partial_mark_stack_size_target(); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3922 } else { |
| 342 | 3923 target_size = 0; |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3924 } |
| 342 | 3925 |
| 3926 if (_cm->mark_stack_size() > target_size) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3927 if (_cm->verbose_low()) { |
| 342 | 3928 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
| 3929 _task_id, target_size); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3930 } |
| 342 | 3931 |
| 3932 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 3933 get_entries_from_global_stack(); | |
| 3934 drain_local_queue(partially); | |
| 3935 } | |
| 3936 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3937 if (_cm->verbose_low()) { |
| 342 | 3938 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
| 3939 _task_id, _cm->mark_stack_size()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3940 } |
| 342 | 3941 } |
| 3942 } | |
| 3943 | |
| 3944 // SATB Queue has several assumptions on whether to call the par or | |
| 3945 // non-par versions of the methods. this is why some of the code is | |
| 3946 // replicated. We should really get rid of the single-threaded version | |
| 3947 // of the code to simplify things. | |
| 3948 void CMTask::drain_satb_buffers() { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3949 if (has_aborted()) return; |
| 342 | 3950 |
| 3951 // We set this so that the regular clock knows that we're in the | |
| 3952 // middle of draining buffers and doesn't set the abort flag when it | |
| 3953 // notices that SATB buffers are available for draining. It'd be | |
| 3954 // very counter productive if it did that. :-) | |
| 3955 _draining_satb_buffers = true; | |
| 3956 | |
| 3957 CMObjectClosure oc(this); | |
| 3958 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3959 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3960 satb_mq_set.set_par_closure(_task_id, &oc); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3961 } else { |
| 342 | 3962 satb_mq_set.set_closure(&oc); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3963 } |
| 342 | 3964 |
| 3965 // This keeps claiming and applying the closure to completed buffers | |
| 3966 // until we run out of buffers or we need to abort. | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
3967 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3968 while (!has_aborted() && |
| 3969 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3970 if (_cm->verbose_medium()) { |
| 342 | 3971 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3972 } |
| 342 | 3973 statsOnly( ++_satb_buffers_processed ); |
| 3974 regular_clock_call(); | |
| 3975 } | |
| 3976 } else { | |
| 3977 while (!has_aborted() && | |
| 3978 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3979 if (_cm->verbose_medium()) { |
| 342 | 3980 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3981 } |
| 342 | 3982 statsOnly( ++_satb_buffers_processed ); |
| 3983 regular_clock_call(); | |
| 3984 } | |
| 3985 } | |
| 3986 | |
| 3987 if (!concurrent() && !has_aborted()) { | |
| 3988 // We should only do this during remark. | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3989 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3990 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3991 } else { |
| 342 | 3992 satb_mq_set.iterate_closure_all_threads(); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3993 } |
| 342 | 3994 } |
| 3995 | |
| 3996 _draining_satb_buffers = false; | |
| 3997 | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3998 assert(has_aborted() || |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3999 concurrent() || |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4000 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 4001 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4002 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4003 satb_mq_set.set_par_closure(_task_id, NULL); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4004 } else { |
| 342 | 4005 satb_mq_set.set_closure(NULL); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4006 } |
| 342 | 4007 |
| 4008 // again, this was a potentially expensive operation, decrease the | |
| 4009 // limits to get the regular clock call early | |
| 4010 decrease_limits(); | |
| 4011 } | |
| 4012 | |
| 4013 void CMTask::drain_region_stack(BitMapClosure* bc) { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
4014 assert(_cm->region_stack_empty(), "region stack should be empty"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
4015 assert(_aborted_region.is_empty(), "aborted region should be empty"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
4016 return; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
4017 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4018 if (has_aborted()) return; |
| 342 | 4019 |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4020 assert(_region_finger == NULL, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4021 "it should be NULL when we're not scanning a region"); |
| 342 | 4022 |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4023 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4024 if (_cm->verbose_low()) { |
| 342 | 4025 gclog_or_tty->print_cr("[%d] draining region stack, size = %d", |
| 4026 _task_id, _cm->region_stack_size()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4027 } |
| 342 | 4028 |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4029 MemRegion mr; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4030 |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4031 if (!_aborted_region.is_empty()) { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4032 mr = _aborted_region; |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4033 _aborted_region = MemRegion(); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4034 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4035 if (_cm->verbose_low()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4036 gclog_or_tty->print_cr("[%d] scanning aborted region " |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4037 "[ " PTR_FORMAT ", " PTR_FORMAT " )", |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4038 _task_id, mr.start(), mr.end()); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4039 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4040 } else { |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4041 mr = _cm->region_stack_pop_lock_free(); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4042 // it returns MemRegion() if the pop fails |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4043 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4044 } |
| 342 | 4045 |
| 4046 while (mr.start() != NULL) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4047 if (_cm->verbose_medium()) { |
| 342 | 4048 gclog_or_tty->print_cr("[%d] we are scanning region " |
| 4049 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 4050 _task_id, mr.start(), mr.end()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4051 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4052 |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4053 assert(mr.end() <= _cm->finger(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4054 "otherwise the region shouldn't be on the stack"); |
| 342 | 4055 assert(!mr.is_empty(), "Only non-empty regions live on the region stack"); |
| 4056 if (_nextMarkBitMap->iterate(bc, mr)) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4057 assert(!has_aborted(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4058 "cannot abort the task without aborting the bitmap iteration"); |
| 342 | 4059 |
| 4060 // We finished iterating over the region without aborting. | |
| 4061 regular_clock_call(); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4062 if (has_aborted()) { |
| 342 | 4063 mr = MemRegion(); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4064 } else { |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4065 mr = _cm->region_stack_pop_lock_free(); |
| 342 | 4066 // it returns MemRegion() if the pop fails |
| 4067 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); | |
| 4068 } | |
| 4069 } else { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4070 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4071 |
| 4072 // The only way to abort the bitmap iteration is to return | |
| 4073 // false from the do_bit() method. However, inside the | |
| 4074 // do_bit() method we move the _region_finger to point to the | |
| 4075 // object currently being looked at. So, if we bail out, we | |
| 4076 // have definitely set _region_finger to something non-null. | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4077 assert(_region_finger != NULL, "invariant"); |
| 342 | 4078 |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4079 // Make sure that any previously aborted region has been |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4080 // cleared. |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4081 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4082 |
| 342 | 4083 // The iteration was actually aborted. So now _region_finger |
| 4084 // points to the address of the object we last scanned. If we | |
| 4085 // leave it there, when we restart this task, we will rescan | |
| 4086 // the object. It is easy to avoid this. We move the finger by | |
| 4087 // enough to point to the next possible object header (the | |
| 4088 // bitmap knows by how much we need to move it as it knows its | |
| 4089 // granularity). | |
| 4090 MemRegion newRegion = | |
| 4091 MemRegion(_nextMarkBitMap->nextWord(_region_finger), mr.end()); | |
| 4092 | |
| 4093 if (!newRegion.is_empty()) { | |
| 4094 if (_cm->verbose_low()) { | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4095 gclog_or_tty->print_cr("[%d] recording unscanned region" |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4096 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
| 342 | 4097 _task_id, |
| 4098 newRegion.start(), newRegion.end()); | |
| 4099 } | |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4100 // Now record the part of the region we didn't scan to |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4101 // make sure this task scans it later. |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4102 _aborted_region = newRegion; |
| 342 | 4103 } |
| 4104 // break from while | |
| 4105 mr = MemRegion(); | |
| 4106 } | |
| 4107 _region_finger = NULL; | |
| 4108 } | |
| 4109 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4110 if (_cm->verbose_low()) { |
| 342 | 4111 gclog_or_tty->print_cr("[%d] drained region stack, size = %d", |
| 4112 _task_id, _cm->region_stack_size()); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4113 } |
| 342 | 4114 } |
| 4115 } | |
| 4116 | |
| 4117 void CMTask::print_stats() { | |
| 4118 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
| 4119 _task_id, _calls); | |
| 4120 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
| 4121 _elapsed_time_ms, _termination_time_ms); | |
| 4122 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4123 _step_times_ms.num(), _step_times_ms.avg(), | |
| 4124 _step_times_ms.sd()); | |
| 4125 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4126 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 4127 | |
| 4128 #if _MARKING_STATS_ | |
| 4129 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4130 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 4131 _all_clock_intervals_ms.sd()); | |
| 4132 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4133 _all_clock_intervals_ms.maximum(), | |
| 4134 _all_clock_intervals_ms.sum()); | |
| 4135 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 4136 _clock_due_to_scanning, _clock_due_to_marking); | |
| 4137 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 4138 _objs_scanned, _objs_found_on_bitmap); | |
| 4139 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 4140 _local_pushes, _local_pops, _local_max_size); | |
| 4141 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 4142 _global_pushes, _global_pops, _global_max_size); | |
| 4143 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 4144 _global_transfers_to,_global_transfers_from); | |
| 4145 gclog_or_tty->print_cr(" Regions: claimed = %d, Region Stack: pops = %d", | |
| 4146 _regions_claimed, _region_stack_pops); | |
| 4147 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); | |
| 4148 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 4149 _steal_attempts, _steals); | |
| 4150 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 4151 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 4152 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 4153 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 4154 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 4155 #endif // _MARKING_STATS_ | |
| 4156 } | |
| 4157 | |
| 4158 /***************************************************************************** | |
| 4159 | |
| 4160 The do_marking_step(time_target_ms) method is the building block | |
| 4161 of the parallel marking framework. It can be called in parallel | |
| 4162 with other invocations of do_marking_step() on different tasks | |
| 4163 (but only one per task, obviously) and concurrently with the | |
| 4164 mutator threads, or during remark, hence it eliminates the need | |
| 4165 for two versions of the code. When called during remark, it will | |
| 4166 pick up from where the task left off during the concurrent marking | |
| 4167 phase. Interestingly, tasks are also claimable during evacuation | |
| 4168 pauses too, since do_marking_step() ensures that it aborts before | |
| 4169 it needs to yield. | |
| 4170 | |
| 4171 The data structures that is uses to do marking work are the | |
| 4172 following: | |
| 4173 | |
| 4174 (1) Marking Bitmap. If there are gray objects that appear only | |
| 4175 on the bitmap (this happens either when dealing with an overflow | |
| 4176 or when the initial marking phase has simply marked the roots | |
| 4177 and didn't push them on the stack), then tasks claim heap | |
| 4178 regions whose bitmap they then scan to find gray objects. A | |
| 4179 global finger indicates where the end of the last claimed region | |
| 4180 is. A local finger indicates how far into the region a task has | |
| 4181 scanned. The two fingers are used to determine how to gray an | |
| 4182 object (i.e. whether simply marking it is OK, as it will be | |
| 4183 visited by a task in the future, or whether it needs to be also | |
| 4184 pushed on a stack). | |
| 4185 | |
| 4186 (2) Local Queue. The local queue of the task which is accessed | |
| 4187 reasonably efficiently by the task. Other tasks can steal from | |
| 4188 it when they run out of work. Throughout the marking phase, a | |
| 4189 task attempts to keep its local queue short but not totally | |
| 4190 empty, so that entries are available for stealing by other | |
| 4191 tasks. Only when there is no more work, a task will totally | |
| 4192 drain its local queue. | |
| 4193 | |
| 4194 (3) Global Mark Stack. This handles local queue overflow. During | |
| 4195 marking only sets of entries are moved between it and the local | |
| 4196 queues, as access to it requires a mutex and more fine-grain | |
| 4197 interaction with it which might cause contention. If it | |
| 4198 overflows, then the marking phase should restart and iterate | |
| 4199 over the bitmap to identify gray objects. Throughout the marking | |
| 4200 phase, tasks attempt to keep the global mark stack at a small | |
| 4201 length but not totally empty, so that entries are available for | |
| 4202 popping by other tasks. Only when there is no more work, tasks | |
| 4203 will totally drain the global mark stack. | |
| 4204 | |
| 4205 (4) Global Region Stack. Entries on it correspond to areas of | |
| 4206 the bitmap that need to be scanned since they contain gray | |
| 4207 objects. Pushes on the region stack only happen during | |
| 4208 evacuation pauses and typically correspond to areas covered by | |
| 4209 GC LABS. If it overflows, then the marking phase should restart | |
| 4210 and iterate over the bitmap to identify gray objects. Tasks will | |
| 4211 try to totally drain the region stack as soon as possible. | |
| 4212 | |
| 4213 (5) SATB Buffer Queue. This is where completed SATB buffers are | |
| 4214 made available. Buffers are regularly removed from this queue | |
| 4215 and scanned for roots, so that the queue doesn't get too | |
| 4216 long. During remark, all completed buffers are processed, as | |
| 4217 well as the filled in parts of any uncompleted buffers. | |
| 4218 | |
| 4219 The do_marking_step() method tries to abort when the time target | |
| 4220 has been reached. There are a few other cases when the | |
| 4221 do_marking_step() method also aborts: | |
| 4222 | |
| 4223 (1) When the marking phase has been aborted (after a Full GC). | |
| 4224 | |
| 4225 (2) When a global overflow (either on the global stack or the | |
| 4226 region stack) has been triggered. Before the task aborts, it | |
| 4227 will actually sync up with the other tasks to ensure that all | |
| 4228 the marking data structures (local queues, stacks, fingers etc.) | |
| 4229 are re-initialised so that when do_marking_step() completes, | |
| 4230 the marking phase can immediately restart. | |
| 4231 | |
| 4232 (3) When enough completed SATB buffers are available. The | |
| 4233 do_marking_step() method only tries to drain SATB buffers right | |
| 4234 at the beginning. So, if enough buffers are available, the | |
| 4235 marking step aborts and the SATB buffers are processed at | |
| 4236 the beginning of the next invocation. | |
| 4237 | |
| 4238 (4) To yield. when we have to yield then we abort and yield | |
| 4239 right at the end of do_marking_step(). This saves us from a lot | |
| 4240 of hassle as, by yielding we might allow a Full GC. If this | |
| 4241 happens then objects will be compacted underneath our feet, the | |
| 4242 heap might shrink, etc. We save checking for this by just | |
| 4243 aborting and doing the yield right at the end. | |
| 4244 | |
| 4245 From the above it follows that the do_marking_step() method should | |
| 4246 be called in a loop (or, otherwise, regularly) until it completes. | |
| 4247 | |
| 4248 If a marking step completes without its has_aborted() flag being | |
| 4249 true, it means it has completed the current marking phase (and | |
| 4250 also all other marking tasks have done so and have all synced up). | |
| 4251 | |
| 4252 A method called regular_clock_call() is invoked "regularly" (in | |
| 4253 sub ms intervals) throughout marking. It is this clock method that | |
| 4254 checks all the abort conditions which were mentioned above and | |
| 4255 decides when the task should abort. A work-based scheme is used to | |
| 4256 trigger this clock method: when the number of object words the | |
| 4257 marking phase has scanned or the number of references the marking | |
| 4258 phase has visited reach a given limit. Additional invocations to | |
| 4259 the method clock have been planted in a few other strategic places | |
| 4260 too. The initial reason for the clock method was to avoid calling | |
| 4261 vtime too regularly, as it is quite expensive. So, once it was in | |
| 4262 place, it was natural to piggy-back all the other conditions on it | |
| 4263 too and not constantly check them throughout the code. | |
| 4264 | |
| 4265 *****************************************************************************/ | |
| 4266 | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4267 void CMTask::do_marking_step(double time_target_ms, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4268 bool do_stealing, |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4269 bool do_termination) { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4270 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4271 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4272 |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4273 assert(concurrent() || _cm->region_stack_empty(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4274 "the region stack should have been cleared before remark"); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4275 assert(concurrent() || !_cm->has_aborted_regions(), |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4276 "aborted regions should have been cleared before remark"); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4277 assert(_region_finger == NULL, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4278 "this should be non-null only when a region is being scanned"); |
| 342 | 4279 |
| 4280 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4281 assert(_task_queues != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4282 assert(_task_queue != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4283 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4284 |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4285 assert(!_claimed, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4286 "only one thread should claim this task at any one time"); |
| 342 | 4287 |
| 4288 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 4289 // possible for two threads to set the _claimed flag at the same | |
| 4290 // time. But it is only for debugging purposes anyway and it will | |
| 4291 // catch most problems. | |
| 4292 _claimed = true; | |
| 4293 | |
| 4294 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4295 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 4296 | |
| 4297 double diff_prediction_ms = | |
| 4298 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 4299 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 4300 | |
| 4301 // set up the variables that are used in the work-based scheme to | |
| 4302 // call the regular clock method | |
| 4303 _words_scanned = 0; | |
| 4304 _refs_reached = 0; | |
| 4305 recalculate_limits(); | |
| 4306 | |
| 4307 // clear all flags | |
| 4308 clear_has_aborted(); | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4309 _has_timed_out = false; |
| 342 | 4310 _draining_satb_buffers = false; |
| 4311 | |
| 4312 ++_calls; | |
| 4313 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4314 if (_cm->verbose_low()) { |
| 342 | 4315 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
| 4316 "target = %1.2lfms >>>>>>>>>>", | |
| 4317 _task_id, _calls, _time_target_ms); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4318 } |
| 342 | 4319 |
| 4320 // Set up the bitmap and oop closures. Anything that uses them is | |
| 4321 // eventually called from this method, so it is OK to allocate these | |
| 4322 // statically. | |
| 4323 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 4324 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 4325 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 4326 |
| 4327 if (_cm->has_overflown()) { | |
| 4328 // This can happen if the region stack or the mark stack overflows | |
| 4329 // during a GC pause and this task, after a yield point, | |
| 4330 // restarts. We have to abort as we need to get into the overflow | |
| 4331 // protocol which happens right at the end of this task. | |
| 4332 set_has_aborted(); | |
| 4333 } | |
| 4334 | |
| 4335 // First drain any available SATB buffers. After this, we will not | |
| 4336 // look at SATB buffers before the next invocation of this method. | |
| 4337 // If enough completed SATB buffers are queued up, the regular clock | |
| 4338 // will abort this task so that it restarts. | |
| 4339 drain_satb_buffers(); | |
| 4340 // ...then partially drain the local queue and the global stack | |
| 4341 drain_local_queue(true); | |
| 4342 drain_global_stack(true); | |
| 4343 | |
| 4344 // Then totally drain the region stack. We will not look at | |
| 4345 // it again before the next invocation of this method. Entries on | |
| 4346 // the region stack are only added during evacuation pauses, for | |
| 4347 // which we have to yield. When we do, we abort the task anyway so | |
| 4348 // it will look at the region stack again when it restarts. | |
| 4349 bitmap_closure.set_scanning_heap_region(false); | |
| 4350 drain_region_stack(&bitmap_closure); | |
| 4351 // ...then partially drain the local queue and the global stack | |
| 4352 drain_local_queue(true); | |
| 4353 drain_global_stack(true); | |
| 4354 | |
| 4355 do { | |
| 4356 if (!has_aborted() && _curr_region != NULL) { | |
| 4357 // This means that we're already holding on to a region. | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4358 assert(_finger != NULL, "if region is not NULL, then the finger " |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4359 "should not be NULL either"); |
| 342 | 4360 |
| 4361 // We might have restarted this task after an evacuation pause | |
| 4362 // which might have evacuated the region we're holding on to | |
| 4363 // underneath our feet. Let's read its limit again to make sure | |
| 4364 // that we do not iterate over a region of the heap that | |
| 4365 // contains garbage (update_region_limit() will also move | |
| 4366 // _finger to the start of the region if it is found empty). | |
| 4367 update_region_limit(); | |
| 4368 // We will start from _finger not from the start of the region, | |
| 4369 // as we might be restarting this task after aborting half-way | |
| 4370 // through scanning this region. In this case, _finger points to | |
| 4371 // the address where we last found a marked object. If this is a | |
| 4372 // fresh region, _finger points to start(). | |
| 4373 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 4374 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4375 if (_cm->verbose_low()) { |
| 342 | 4376 gclog_or_tty->print_cr("[%d] we're scanning part " |
| 4377 "["PTR_FORMAT", "PTR_FORMAT") " | |
| 4378 "of region "PTR_FORMAT, | |
| 4379 _task_id, _finger, _region_limit, _curr_region); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4380 } |
| 342 | 4381 |
| 4382 // Let's iterate over the bitmap of the part of the | |
| 4383 // region that is left. | |
| 4384 bitmap_closure.set_scanning_heap_region(true); | |
| 4385 if (mr.is_empty() || | |
| 4386 _nextMarkBitMap->iterate(&bitmap_closure, mr)) { | |
| 4387 // We successfully completed iterating over the region. Now, | |
| 4388 // let's give up the region. | |
| 4389 giveup_current_region(); | |
| 4390 regular_clock_call(); | |
| 4391 } else { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4392 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4393 // The only way to abort the bitmap iteration is to return |
| 4394 // false from the do_bit() method. However, inside the | |
| 4395 // do_bit() method we move the _finger to point to the | |
| 4396 // object currently being looked at. So, if we bail out, we | |
| 4397 // have definitely set _finger to something non-null. | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4398 assert(_finger != NULL, "invariant"); |
| 342 | 4399 |
| 4400 // Region iteration was actually aborted. So now _finger | |
| 4401 // points to the address of the object we last scanned. If we | |
| 4402 // leave it there, when we restart this task, we will rescan | |
| 4403 // the object. It is easy to avoid this. We move the finger by | |
| 4404 // enough to point to the next possible object header (the | |
| 4405 // bitmap knows by how much we need to move it as it knows its | |
| 4406 // granularity). | |
|
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4407 assert(_finger < _region_limit, "invariant"); |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4408 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4409 // Check if bitmap iteration was aborted while scanning the last object |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4410 if (new_finger >= _region_limit) { |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4411 giveup_current_region(); |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4412 } else { |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4413 move_finger_to(new_finger); |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4414 } |
| 342 | 4415 } |
| 4416 } | |
| 4417 // At this point we have either completed iterating over the | |
| 4418 // region we were holding on to, or we have aborted. | |
| 4419 | |
| 4420 // We then partially drain the local queue and the global stack. | |
| 4421 // (Do we really need this?) | |
| 4422 drain_local_queue(true); | |
| 4423 drain_global_stack(true); | |
| 4424 | |
| 4425 // Read the note on the claim_region() method on why it might | |
| 4426 // return NULL with potentially more regions available for | |
| 4427 // claiming and why we have to check out_of_regions() to determine | |
| 4428 // whether we're done or not. | |
| 4429 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 4430 // We are going to try to claim a new region. We should have | |
| 4431 // given up on the previous one. | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4432 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4433 assert(_curr_region == NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4434 assert(_finger == NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4435 assert(_region_limit == NULL, "invariant"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4436 if (_cm->verbose_low()) { |
| 342 | 4437 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4438 } |
| 342 | 4439 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
| 4440 if (claimed_region != NULL) { | |
| 4441 // Yes, we managed to claim one | |
| 4442 statsOnly( ++_regions_claimed ); | |
| 4443 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4444 if (_cm->verbose_low()) { |
| 342 | 4445 gclog_or_tty->print_cr("[%d] we successfully claimed " |
| 4446 "region "PTR_FORMAT, | |
| 4447 _task_id, claimed_region); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4448 } |
| 342 | 4449 |
| 4450 setup_for_region(claimed_region); | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4451 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 4452 } |
| 4453 // It is important to call the regular clock here. It might take | |
| 4454 // a while to claim a region if, for example, we hit a large | |
| 4455 // block of empty regions. So we need to call the regular clock | |
| 4456 // method once round the loop to make sure it's called | |
| 4457 // frequently enough. | |
| 4458 regular_clock_call(); | |
| 4459 } | |
| 4460 | |
| 4461 if (!has_aborted() && _curr_region == NULL) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4462 assert(_cm->out_of_regions(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4463 "at this point we should be out of regions"); |
| 342 | 4464 } |
| 4465 } while ( _curr_region != NULL && !has_aborted()); | |
| 4466 | |
| 4467 if (!has_aborted()) { | |
| 4468 // We cannot check whether the global stack is empty, since other | |
|
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
342
diff
changeset
|
4469 // tasks might be pushing objects to it concurrently. We also cannot |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
342
diff
changeset
|
4470 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
342
diff
changeset
|
4471 // it can push a partially done region back. |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4472 assert(_cm->out_of_regions(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4473 "at this point we should be out of regions"); |
| 342 | 4474 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4475 if (_cm->verbose_low()) { |
| 342 | 4476 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4477 } |
| 342 | 4478 |
| 4479 // Try to reduce the number of available SATB buffers so that | |
| 4480 // remark has less work to do. | |
| 4481 drain_satb_buffers(); | |
| 4482 } | |
| 4483 | |
| 4484 // Since we've done everything else, we can now totally drain the | |
| 4485 // local queue and global stack. | |
| 4486 drain_local_queue(false); | |
| 4487 drain_global_stack(false); | |
| 4488 | |
| 4489 // Attempt at work stealing from other task's queues. | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4490 if (do_stealing && !has_aborted()) { |
| 342 | 4491 // We have not aborted. This means that we have finished all that |
| 4492 // we could. Let's try to do some stealing... | |
| 4493 | |
| 4494 // We cannot check whether the global stack is empty, since other | |
|
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
342
diff
changeset
|
4495 // tasks might be pushing objects to it concurrently. We also cannot |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
342
diff
changeset
|
4496 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
342
diff
changeset
|
4497 // it can push a partially done region back. |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4498 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4499 "only way to reach here"); |
| 342 | 4500 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4501 if (_cm->verbose_low()) { |
| 342 | 4502 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4503 } |
| 342 | 4504 |
| 4505 while (!has_aborted()) { | |
| 4506 oop obj; | |
| 4507 statsOnly( ++_steal_attempts ); | |
| 4508 | |
| 4509 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4510 if (_cm->verbose_medium()) { |
| 342 | 4511 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
| 4512 _task_id, (void*) obj); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4513 } |
| 342 | 4514 |
| 4515 statsOnly( ++_steals ); | |
| 4516 | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4517 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4518 "any stolen object should be marked"); |
| 342 | 4519 scan_object(obj); |
| 4520 | |
| 4521 // And since we're towards the end, let's totally drain the | |
| 4522 // local queue and global stack. | |
| 4523 drain_local_queue(false); | |
| 4524 drain_global_stack(false); | |
| 4525 } else { | |
| 4526 break; | |
| 4527 } | |
| 4528 } | |
| 4529 } | |
| 4530 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4531 // If we are about to wrap up and go into termination, check if we |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4532 // should raise the overflow flag. |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4533 if (do_termination && !has_aborted()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4534 if (_cm->force_overflow()->should_force()) { |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4535 _cm->set_has_overflown(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4536 regular_clock_call(); |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4537 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4538 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4539 |
| 342 | 4540 // We still haven't aborted. Now, let's try to get into the |
| 4541 // termination protocol. | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4542 if (do_termination && !has_aborted()) { |
| 342 | 4543 // We cannot check whether the global stack is empty, since other |
|
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
342
diff
changeset
|
4544 // tasks might be concurrently pushing objects on it. We also cannot |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
342
diff
changeset
|
4545 // check if the region stack is empty because if a thread is aborting |
|
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
342
diff
changeset
|
4546 // it can push a partially done region back. |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4547 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4548 assert(_cm->out_of_regions(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4549 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 4550 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4551 if (_cm->verbose_low()) { |
| 342 | 4552 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4553 } |
| 342 | 4554 |
| 4555 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4556 // The CMTask class also extends the TerminatorTerminator class, | |
| 4557 // hence its should_exit_termination() method will also decide | |
| 4558 // whether to exit the termination protocol or not. | |
| 4559 bool finished = _cm->terminator()->offer_termination(this); | |
| 4560 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
| 4561 _termination_time_ms += | |
| 4562 termination_end_time_ms - _termination_start_time_ms; | |
| 4563 | |
| 4564 if (finished) { | |
| 4565 // We're all done. | |
| 4566 | |
| 4567 if (_task_id == 0) { | |
| 4568 // let's allow task 0 to do this | |
| 4569 if (concurrent()) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4570 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 4571 // we need to set this to false before the next |
| 4572 // safepoint. This way we ensure that the marking phase | |
| 4573 // doesn't observe any more heap expansions. | |
| 4574 _cm->clear_concurrent_marking_in_progress(); | |
| 4575 } | |
| 4576 } | |
| 4577 | |
| 4578 // We can now guarantee that the global stack is empty, since | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4579 // all other tasks have finished. We separated the guarantees so |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4580 // that, if a condition is false, we can immediately find out |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4581 // which one. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4582 guarantee(_cm->out_of_regions(), "only way to reach here"); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4583 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4584 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4585 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4586 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4587 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4588 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4589 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
| 342 | 4590 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4591 if (_cm->verbose_low()) { |
| 342 | 4592 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4593 } |
| 342 | 4594 } else { |
| 4595 // Apparently there's more work to do. Let's abort this task. It | |
| 4596 // will restart it and we can hopefully find more things to do. | |
| 4597 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4598 if (_cm->verbose_low()) { |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4599 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4600 _task_id); |
|
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4601 } |
| 342 | 4602 |
| 4603 set_has_aborted(); | |
| 4604 statsOnly( ++_aborted_termination ); | |
| 4605 } | |
| 4606 } | |
| 4607 | |
| 4608 // Mainly for debugging purposes to make sure that a pointer to the | |
| 4609 // closure which was statically allocated in this frame doesn't | |
| 4610 // escape it by accident. | |
| 3771 | 4611 set_cm_oop_closure(NULL); |
| 342 | 4612 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 4613 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 4614 // Update the step history. | |
| 4615 _step_times_ms.add(elapsed_time_ms); | |
| 4616 | |
| 4617 if (has_aborted()) { | |
| 4618 // The task was aborted for some reason. | |
| 4619 | |
| 4620 statsOnly( ++_aborted ); | |
| 4621 | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4622 if (_has_timed_out) { |
| 342 | 4623 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 4624 // Keep statistics of how well we did with respect to hitting | |
| 4625 // our target only if we actually timed out (if we aborted for | |
| 4626 // other reasons, then the results might get skewed). | |
| 4627 _marking_step_diffs_ms.add(diff_ms); | |
| 4628 } | |
| 4629 | |
| 4630 if (_cm->has_overflown()) { | |
| 4631 // This is the interesting one. We aborted because a global | |
| 4632 // overflow was raised. This means we have to restart the | |
| 4633 // marking phase and start iterating over regions. However, in | |
| 4634 // order to do this we have to make sure that all tasks stop | |
| 4635 // what they are doing and re-initialise in a safe manner. We | |
| 4636 // will achieve this with the use of two barrier sync points. | |
| 4637 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4638 if (_cm->verbose_low()) { |
| 342 | 4639 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4640 } |
| 342 | 4641 |
| 4642 _cm->enter_first_sync_barrier(_task_id); | |
| 4643 // When we exit this sync barrier we know that all tasks have | |
| 4644 // stopped doing marking work. So, it's now safe to | |
| 4645 // re-initialise our data structures. At the end of this method, | |
| 4646 // task 0 will clear the global data structures. | |
| 4647 | |
| 4648 statsOnly( ++_aborted_overflow ); | |
| 4649 | |
| 4650 // We clear the local state of this task... | |
| 4651 clear_region_fields(); | |
| 4652 | |
| 4653 // ...and enter the second barrier. | |
| 4654 _cm->enter_second_sync_barrier(_task_id); | |
| 4655 // At this point everything has bee re-initialised and we're | |
| 4656 // ready to restart. | |
| 4657 } | |
| 4658 | |
| 4659 if (_cm->verbose_low()) { | |
| 4660 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
| 4661 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4662 _task_id, _time_target_ms, elapsed_time_ms); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4663 if (_cm->has_aborted()) { |
| 342 | 4664 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
| 4665 _task_id); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4666 } |
| 342 | 4667 } |
| 4668 } else { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4669 if (_cm->verbose_low()) { |
| 342 | 4670 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 4671 "elapsed = %1.2lfms <<<<<<<<<<", | |
| 4672 _task_id, _time_target_ms, elapsed_time_ms); | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4673 } |
| 342 | 4674 } |
| 4675 | |
| 4676 _claimed = false; | |
| 4677 } | |
| 4678 | |
| 4679 CMTask::CMTask(int task_id, | |
| 4680 ConcurrentMark* cm, | |
| 4681 CMTaskQueue* task_queue, | |
| 4682 CMTaskQueueSet* task_queues) | |
| 4683 : _g1h(G1CollectedHeap::heap()), | |
| 4684 _task_id(task_id), _cm(cm), | |
| 4685 _claimed(false), | |
| 4686 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 4687 _task_queue(task_queue), | |
| 4688 _task_queues(task_queues), | |
| 3771 | 4689 _cm_oop_closure(NULL), |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
4690 _aborted_region(MemRegion()) { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4691 guarantee(task_queue != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4692 guarantee(task_queues != NULL, "invariant"); |
| 342 | 4693 |
| 4694 statsOnly( _clock_due_to_scanning = 0; | |
| 4695 _clock_due_to_marking = 0 ); | |
| 4696 | |
| 4697 _marking_step_diffs_ms.add(0.5); | |
| 4698 } | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4699 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4700 // These are formatting macros that are used below to ensure |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4701 // 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
parents:
2369
diff
changeset
|
4702 // header for a particular value and they should be kept consistent |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4703 // with the corresponding macro. Also note that most of the macros add |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4704 // the necessary white space (as a prefix) which makes them a bit |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4705 // easier to compose. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4706 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4707 // All the output lines are prefixed with this string to be able to |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4708 // identify them easily in a large log file. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4709 #define G1PPRL_LINE_PREFIX "###" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4710 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4711 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4712 #ifdef _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4713 #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
parents:
2369
diff
changeset
|
4714 #else // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4715 #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
parents:
2369
diff
changeset
|
4716 #endif // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4717 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4718 // For per-region info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4719 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4720 #define G1PPRL_TYPE_H_FORMAT " %4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4721 #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
tonyp
parents:
2369
diff
changeset
|
4722 #define G1PPRL_BYTE_H_FORMAT " %9s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4723 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4724 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4725 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4726 // For summary info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4727 #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
diff
changeset
|
4728 #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
parents:
2369
diff
changeset
|
4729 #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
|
4730 #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
|
4731 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4732 G1PrintRegionLivenessInfoClosure:: |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4733 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
parents:
2369
diff
changeset
|
4734 : _out(out), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4735 _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
parents:
2369
diff
changeset
|
4736 _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
parents:
2369
diff
changeset
|
4737 _hum_used_bytes(0), _hum_capacity_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4738 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4739 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4740 MemRegion g1_committed = g1h->g1_committed(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4741 MemRegion g1_reserved = g1h->g1_reserved(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4742 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
|
4743 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4744 // 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
|
4745 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4746 _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
|
4747 _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
|
4748 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
|
4749 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
|
4750 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
|
4751 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
|
4752 g1_reserved.start(), g1_reserved.end(), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4753 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
|
4754 _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
|
4755 _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
|
4756 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
|
4757 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
|
4758 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
|
4759 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
|
4760 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
|
4761 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
|
4762 "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
|
4763 "used", "prev-live", "next-live", "gc-eff"); |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4764 _out->print_cr(G1PPRL_LINE_PREFIX |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4765 G1PPRL_TYPE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4766 G1PPRL_ADDR_BASE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4767 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4768 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4769 G1PPRL_BYTE_H_FORMAT |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4770 G1PPRL_DOUBLE_H_FORMAT, |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4771 "", "", |
|
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4772 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4773 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4774 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4775 // It takes as a parameter a reference to one of the _hum_* fields, it |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4776 // deduces the corresponding value for a region in a humongous region |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4777 // series (either the region size, or what's left if the _hum_* field |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4778 // is < the region size), and updates the _hum_* field accordingly. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4779 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4780 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
|
4781 // The > 0 check is to deal with the prev and next live bytes which |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4782 // could be 0. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4783 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4784 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4785 *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
|
4786 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4787 return bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4788 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4789 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4790 // It deduces the values for a region in a humongous region series |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4791 // from the _hum_* fields and updates those accordingly. It assumes |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4792 // that that _hum_* fields have already been set up from the "starts |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4793 // 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
|
4794 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4795 size_t* capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4796 size_t* prev_live_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4797 size_t* next_live_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4798 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4799 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4800 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4801 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4802 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4803 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4804 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4805 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4806 const char* type = ""; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4807 HeapWord* bottom = r->bottom(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4808 HeapWord* end = r->end(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4809 size_t capacity_bytes = r->capacity(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4810 size_t used_bytes = r->used(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4811 size_t prev_live_bytes = r->live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4812 size_t next_live_bytes = r->next_live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4813 double gc_eff = r->gc_efficiency(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4814 if (r->used() == 0) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4815 type = "FREE"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4816 } else if (r->is_survivor()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4817 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4818 } else if (r->is_young()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4819 type = "EDEN"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4820 } else if (r->startsHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4821 type = "HUMS"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4822 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4823 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4824 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4825 "they should have been zeroed after the last time we used them"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4826 // Set up the _hum_* fields. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4827 _hum_capacity_bytes = capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4828 _hum_used_bytes = used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4829 _hum_prev_live_bytes = prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4830 _hum_next_live_bytes = next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4831 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4832 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4833 end = bottom + HeapRegion::GrainWords; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4834 } else if (r->continuesHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4835 type = "HUMC"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4836 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4837 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4838 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4839 } else { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4840 type = "OLD"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4841 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4842 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4843 _total_used_bytes += used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4844 _total_capacity_bytes += capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4845 _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
|
4846 _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
|
4847 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4848 // Print a line for this particular region. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4849 _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
|
4850 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
|
4851 G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4852 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
|
4853 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
|
4854 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
|
4855 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
|
4856 type, bottom, end, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4857 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4858 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4859 return false; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4860 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4861 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4862 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4863 // Print the footer of the output. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4864 _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
|
4865 _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
|
4866 " SUMMARY" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4867 G1PPRL_SUM_MB_FORMAT("capacity") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4868 G1PPRL_SUM_MB_PERC_FORMAT("used") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4869 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4870 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4871 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
|
4872 bytes_to_mb(_total_used_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4873 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
|
4874 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
|
4875 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
|
4876 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
|
4877 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
|
4878 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4879 } |