Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 4829:9509c20bba28
6976060: G1: humongous object allocations should initiate marking cycles when necessary
Reviewed-by: tonyp, johnc
author | brutisso |
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date | Mon, 16 Jan 2012 22:10:05 +0100 |
parents | 851b58c26def |
children | 0b3d1ec6eaee |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
3771 | 32 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
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34 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 35 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
36 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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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 |
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45 // Concurrent marking bit map wrapper |
342 | 46 |
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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 | |
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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()), | |
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59 "couldn't reseve backing store for concurrent marking bit map"); |
342 | 60 assert(_virtual_space.committed_size() == brs.size(), |
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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); | |
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74 if (limit == NULL) { |
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75 limit = _bmStartWord + _bmWordSize; |
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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); | |
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89 if (limit == NULL) { |
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90 limit = _bmStartWord + _bmWordSize; |
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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"); | |
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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); | |
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174 if (_base == NULL) { |
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175 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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176 } |
342 | 177 _index = 0; |
178 _capacity = (jint) size; | |
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179 _saved_index = -1; |
342 | 180 NOT_PRODUCT(_max_depth = 0); |
181 } | |
182 | |
183 CMMarkStack::~CMMarkStack() { | |
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184 if (_base != NULL) { |
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185 FREE_C_HEAP_ARRAY(oop, _base); |
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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; | |
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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); | |
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278 if (_base == NULL) { |
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279 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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280 } |
342 | 281 _index = 0; |
282 _capacity = (jint) size; | |
283 } | |
284 | |
285 CMRegionStack::~CMRegionStack() { | |
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286 if (_base != NULL) { |
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287 FREE_C_HEAP_ARRAY(oop, _base); |
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288 } |
342 | 289 } |
290 | |
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291 void CMRegionStack::push_lock_free(MemRegion mr) { |
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292 guarantee(false, "push_lock_free(): don't call this any more"); |
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293 |
342 | 294 assert(mr.word_size() > 0, "Precondition"); |
295 while (true) { | |
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296 jint index = _index; |
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297 |
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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 | |
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313 // Lock-free pop of the region stack. Called during the concurrent |
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314 // marking / remark phases. Should only be called in tandem with |
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315 // other lock-free pops. |
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316 MemRegion CMRegionStack::pop_lock_free() { |
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317 guarantee(false, "pop_lock_free(): don't call this any more"); |
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318 |
342 | 319 while (true) { |
320 jint index = _index; | |
321 | |
322 if (index == 0) { | |
323 return MemRegion(); | |
324 } | |
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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) { | |
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331 assert(mr.end() != NULL, "invariant"); |
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332 assert(mr.word_size() > 0, "invariant"); |
342 | 333 return mr; |
334 } else { | |
335 // that entry was invalidated... let's skip it | |
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336 assert(mr.end() == NULL, "invariant"); |
342 | 337 } |
338 } | |
339 // Otherwise, we need to try again. | |
340 } | |
341 } | |
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342 |
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343 #if 0 |
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344 // The routines that manipulate the region stack with a lock are |
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345 // not currently used. They should be retained, however, as a |
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346 // diagnostic aid. |
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347 |
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348 void CMRegionStack::push_with_lock(MemRegion mr) { |
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349 assert(mr.word_size() > 0, "Precondition"); |
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350 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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351 |
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352 if (isFull()) { |
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353 _overflow = true; |
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354 return; |
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355 } |
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356 |
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357 _base[_index] = mr; |
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358 _index += 1; |
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359 } |
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360 |
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361 MemRegion CMRegionStack::pop_with_lock() { |
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362 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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363 |
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364 while (true) { |
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365 if (_index == 0) { |
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366 return MemRegion(); |
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367 } |
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368 _index -= 1; |
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369 |
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370 MemRegion mr = _base[_index]; |
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371 if (mr.start() != NULL) { |
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372 assert(mr.end() != NULL, "invariant"); |
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373 assert(mr.word_size() > 0, "invariant"); |
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374 return mr; |
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375 } else { |
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376 // that entry was invalidated... let's skip it |
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377 assert(mr.end() == NULL, "invariant"); |
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378 } |
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379 } |
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380 } |
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381 #endif |
342 | 382 |
383 bool CMRegionStack::invalidate_entries_into_cset() { | |
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384 guarantee(false, "invalidate_entries_into_cset(): don't call this any more"); |
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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) { | |
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391 assert(mr.end() != NULL, "invariant"); |
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392 assert(mr.word_size() > 0, "invariant"); |
342 | 393 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
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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 | |
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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()) { | |
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424 res = false; |
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425 break; |
342 | 426 } |
427 } | |
428 debug_only(_drain_in_progress = false); | |
429 return res; | |
430 } | |
431 | |
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432 void CMMarkStack::note_start_of_gc() { |
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433 assert(_saved_index == -1, |
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434 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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435 _saved_index = _index; |
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436 } |
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437 |
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438 void CMMarkStack::note_end_of_gc() { |
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439 // This is intentionally a guarantee, instead of an assert. If we |
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440 // accidentally add something to the mark stack during GC, it |
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441 // will be a correctness issue so it's better if we crash. we'll |
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442 // only check this once per GC anyway, so it won't be a performance |
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443 // issue in any way. |
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444 guarantee(_saved_index == _index, |
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445 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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446 _saved_index = -1; |
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447 } |
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448 |
342 | 449 void CMMarkStack::oops_do(OopClosure* f) { |
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450 assert(_saved_index == _index, |
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451 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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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 | |
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467 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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468 return MAX2((n_par_threads + 2) / 4, 1U); |
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469 } |
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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), | |
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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 | |
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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), | |
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503 _has_aborted(false), |
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504 _restart_for_overflow(false), |
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505 _concurrent_marking_in_progress(false), |
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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), | |
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515 _parallel_workers(NULL) { |
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516 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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517 if (verbose_level < no_verbose) { |
342 | 518 verbose_level = no_verbose; |
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519 } |
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520 if (verbose_level > high_verbose) { |
342 | 521 verbose_level = high_verbose; |
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522 } |
342 | 523 _verbose_level = verbose_level; |
524 | |
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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); | |
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528 } |
342 | 529 |
1284 | 530 _markStack.allocate(MarkStackSize); |
751 | 531 _regionStack.allocate(G1MarkRegionStackSize); |
342 | 532 |
533 // Create & start a ConcurrentMark thread. | |
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534 _cmThread = new ConcurrentMarkThread(this); |
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535 assert(cmThread() != NULL, "CM Thread should have been created"); |
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536 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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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 | |
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567 _parallel_marking_threads = 0; |
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568 _max_parallel_marking_threads = 0; |
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569 _sleep_factor = 0.0; |
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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 | |
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576 _parallel_marking_threads = (uint) ConcGCThreads; |
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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 | |
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597 _parallel_marking_threads = (uint) marking_thread_num; |
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598 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 599 _sleep_factor = sleep_factor; |
600 _marking_task_overhead = marking_task_overhead; | |
601 } else { | |
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602 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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603 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 604 _sleep_factor = 0.0; |
605 _marking_task_overhead = 1.0; | |
606 } | |
607 | |
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608 if (parallel_marking_threads() > 1) { |
342 | 609 _cleanup_task_overhead = 1.0; |
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610 } else { |
342 | 611 _cleanup_task_overhead = marking_task_overhead(); |
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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 | |
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624 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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625 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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626 _max_parallel_marking_threads, false, true); |
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627 if (_parallel_workers == NULL) { |
342 | 628 vm_exit_during_initialization("Failed necessary allocation."); |
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629 } else { |
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630 _parallel_workers->initialize_workers(); |
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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. | |
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650 if (!concurrent_marking_in_progress() && !force) return; |
342 | 651 |
652 MemRegion committed = _g1h->g1_committed(); | |
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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 | |
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675 // Separated the asserts so that we know which one fires. |
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676 assert(_heap_start != NULL, "heap bounds should look ok"); |
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677 assert(_heap_end != NULL, "heap bounds should look ok"); |
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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 | |
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683 if (verbose_low()) { |
342 | 684 gclog_or_tty->print_cr("[global] resetting"); |
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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. | |
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690 for (int i = 0; i < (int) _max_task_num; ++i) { |
342 | 691 _tasks[i]->reset(_nextMarkBitMap); |
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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 | |
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699 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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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. | |
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720 assert(!concurrent_marking_in_progress(), "invariant"); |
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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() { | |
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740 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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741 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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742 |
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743 // Make sure that the concurrent mark thread looks to still be in |
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744 // the current cycle. |
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745 guarantee(cmThread()->during_cycle(), "invariant"); |
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746 |
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747 // We are finishing up the current cycle by clearing the next |
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748 // marking bitmap and getting it ready for the next cycle. During |
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749 // this time no other cycle can start. So, let's make sure that this |
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750 // is the case. |
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751 guarantee(!g1h->mark_in_progress(), "invariant"); |
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752 |
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753 // clear the mark bitmap (no grey objects to start with). |
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754 // We need to do this in chunks and offer to yield in between |
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755 // each chunk. |
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756 HeapWord* start = _nextMarkBitMap->startWord(); |
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757 HeapWord* end = _nextMarkBitMap->endWord(); |
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758 HeapWord* cur = start; |
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759 size_t chunkSize = M; |
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760 while (cur < end) { |
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761 HeapWord* next = cur + chunkSize; |
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762 if (next > end) { |
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763 next = end; |
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764 } |
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765 MemRegion mr(cur,next); |
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766 _nextMarkBitMap->clearRange(mr); |
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767 cur = next; |
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768 do_yield_check(); |
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769 |
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770 // Repeat the asserts from above. We'll do them as asserts here to |
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771 // minimize their overhead on the product. However, we'll have |
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772 // them as guarantees at the beginning / end of the bitmap |
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773 // clearing to get some checking in the product. |
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774 assert(cmThread()->during_cycle(), "invariant"); |
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775 assert(!g1h->mark_in_progress(), "invariant"); |
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776 } |
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777 |
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778 // Repeat the asserts from above. |
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779 guarantee(cmThread()->during_cycle(), "invariant"); |
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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()) { | |
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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 | |
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799 #ifndef PRODUCT |
1044 | 800 if (G1PrintReachableAtInitialMark) { |
1388 | 801 print_reachable("at-cycle-start", |
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802 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 803 } |
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804 #endif |
342 | 805 |
806 // Initialise marking structures. This has to be done in a STW phase. | |
807 reset(); | |
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808 |
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809 // For each region note start of marking. |
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810 NoteStartOfMarkHRClosure startcl; |
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811 g1h->heap_region_iterate(&startcl); |
342 | 812 } |
813 | |
814 | |
815 void ConcurrentMark::checkpointRootsInitialPost() { | |
816 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
817 | |
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818 // If we force an overflow during remark, the remark operation will |
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819 // actually abort and we'll restart concurrent marking. If we always |
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820 // force an oveflow during remark we'll never actually complete the |
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821 // marking phase. So, we initilize this here, at the start of the |
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822 // cycle, so that at the remaining overflow number will decrease at |
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823 // every remark and we'll eventually not need to cause one. |
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824 force_overflow_stw()->init(); |
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825 |
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826 // Start Concurrent Marking weak-reference discovery. |
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827 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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828 // enable ("weak") refs discovery |
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829 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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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
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833 // This is the start of the marking cycle, we're expected all |
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834 // threads to have SATB queues with active set to false. |
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835 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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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 /* | |
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845 * Notice that in the next two methods, we actually leave the STS |
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846 * during the barrier sync and join it immediately afterwards. If we |
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847 * do not do this, the following deadlock can occur: one thread could |
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848 * be in the barrier sync code, waiting for the other thread to also |
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849 * sync up, whereas another one could be trying to yield, while also |
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850 * waiting for the other threads to sync up too. |
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851 * |
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852 * Note, however, that this code is also used during remark and in |
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853 * this case we should not attempt to leave / enter the STS, otherwise |
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854 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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855 * (product). So we should only leave / enter the STS if we are |
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856 * operating concurrently. |
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857 * |
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858 * Because the thread that does the sync barrier has left the STS, it |
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859 * is possible to be suspended for a Full GC or an evacuation pause |
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860 * could occur. This is actually safe, since the entering the sync |
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861 * barrier is one of the last things do_marking_step() does, and it |
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862 * doesn't manipulate any data structures afterwards. |
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863 */ |
342 | 864 |
865 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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866 if (verbose_low()) { |
342 | 867 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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868 } |
342 | 869 |
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870 if (concurrent()) { |
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871 ConcurrentGCThread::stsLeave(); |
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872 } |
342 | 873 _first_overflow_barrier_sync.enter(); |
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874 if (concurrent()) { |
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875 ConcurrentGCThread::stsJoin(); |
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876 } |
342 | 877 // at this point everyone should have synced up and not be doing any |
878 // more work | |
879 | |
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880 if (verbose_low()) { |
342 | 881 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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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 | |
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887 // We should be here because of an overflow. During STW we should |
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888 // not clear the overflow flag since we rely on it being true when |
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889 // we exit this method to abort the pause and restart concurent |
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890 // marking. |
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891 clear_marking_state(concurrent() /* clear_overflow */); |
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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) { | |
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906 if (verbose_low()) { |
342 | 907 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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908 } |
342 | 909 |
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910 if (concurrent()) { |
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911 ConcurrentGCThread::stsLeave(); |
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912 } |
342 | 913 _second_overflow_barrier_sync.enter(); |
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914 if (concurrent()) { |
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915 ConcurrentGCThread::stsJoin(); |
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916 } |
342 | 917 // at this point everything should be re-initialised and ready to go |
918 | |
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919 if (verbose_low()) { |
342 | 920 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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921 } |
342 | 922 } |
923 | |
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924 #ifndef PRODUCT |
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925 void ForceOverflowSettings::init() { |
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926 _num_remaining = G1ConcMarkForceOverflow; |
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927 _force = false; |
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928 update(); |
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929 } |
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930 |
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931 void ForceOverflowSettings::update() { |
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932 if (_num_remaining > 0) { |
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933 _num_remaining -= 1; |
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934 _force = true; |
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935 } else { |
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936 _force = false; |
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937 } |
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938 } |
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939 |
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940 bool ForceOverflowSettings::should_force() { |
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941 if (_force) { |
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942 _force = false; |
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943 return true; |
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944 } else { |
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945 return false; |
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946 } |
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947 } |
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948 #endif // !PRODUCT |
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949 |
342 | 950 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { |
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951 guarantee(false, "grayRegionIfNecessary(): don't call this any more"); |
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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 | |
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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; | |
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961 } |
342 | 962 |
963 HeapWord* finger = _finger; | |
964 | |
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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); | |
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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. | |
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974 assert(mr.end() <= finger, "invariant"); |
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975 |
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976 // Separated the asserts so that we know which one fires. |
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977 assert(mr.start() <= mr.end(), |
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978 "region boundaries should fall within the committed space"); |
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979 assert(_heap_start <= mr.start(), |
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980 "region boundaries should fall within the committed space"); |
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981 assert(mr.end() <= _heap_end, |
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982 "region boundaries should fall within the committed space"); |
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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()); | |
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987 } |
342 | 988 |
1835
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989 if (!region_stack_push_lock_free(mr)) { |
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990 if (verbose_low()) { |
342 | 991 gclog_or_tty->print_cr("[global] region stack has overflown."); |
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992 } |
342 | 993 } |
994 } | |
995 } | |
996 | |
997 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
4787
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998 guarantee(false, "markAndGrayObjectIfNecessary(): don't call this any more"); |
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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)) { | |
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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; | |
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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))) { | |
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1020 if (verbose_low()) { |
342 | 1021 gclog_or_tty->print_cr("[global] global stack overflow " |
1022 "during parMark"); | |
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1023 } |
342 | 1024 } |
1025 } | |
1026 } | |
1027 } | |
1028 } | |
1029 | |
1030 class CMConcurrentMarkingTask: public AbstractGangTask { | |
1031 private: | |
1032 ConcurrentMark* _cm; | |
1033 ConcurrentMarkThread* _cmt; | |
1034 | |
1035 public: | |
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1036 void work(uint worker_id) { |
1023
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1037 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1038 "this should only be done by a conc GC thread"); |
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1039 ResourceMark rm; |
342 | 1040 |
1041 double start_vtime = os::elapsedVTime(); | |
1042 | |
1043 ConcurrentGCThread::stsJoin(); | |
1044 | |
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1045 assert(worker_id < _cm->active_tasks(), "invariant"); |
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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(); | |
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1052 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1053 |
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1054 the_task->do_marking_step(mark_step_duration_ms, |
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1055 true /* do_stealing */, |
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1056 true /* do_termination */); |
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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 | |
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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
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1088 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1089 |
1090 ConcurrentGCThread::stsLeave(); | |
1091 | |
1092 double end_vtime = os::elapsedVTime(); | |
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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 | |
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1103 // Calculates the number of active workers for a concurrent |
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1104 // phase. |
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1105 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1106 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1107 uint n_conc_workers = 0; |
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1108 if (!UseDynamicNumberOfGCThreads || |
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1109 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1110 !ForceDynamicNumberOfGCThreads)) { |
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1111 n_conc_workers = max_parallel_marking_threads(); |
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1112 } else { |
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1113 n_conc_workers = |
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1114 AdaptiveSizePolicy::calc_default_active_workers( |
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1115 max_parallel_marking_threads(), |
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1116 1, /* Minimum workers */ |
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1117 parallel_marking_threads(), |
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1118 Threads::number_of_non_daemon_threads()); |
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1119 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1120 // that scaling has already gone into "_max_parallel_marking_threads". |
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1121 } |
4711 | 1122 assert(n_conc_workers > 0, "Always need at least 1"); |
1123 return n_conc_workers; | |
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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; | |
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1129 } |
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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; | |
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1140 force_overflow_conc()->init(); |
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1141 |
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1142 // _g1h has _n_par_threads |
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1143 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1144 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1145 "Maximum number of marking threads exceeded"); |
4711 | 1146 |
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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()); | |
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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); |
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1159 } else { |
342 | 1160 markingTask.work(0); |
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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"); | |
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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 | |
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1178 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1179 |
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1180 if (VerifyDuringGC) { |
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1181 HandleMark hm; // handle scope |
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1182 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1183 Universe::heap()->prepare_for_verify(); |
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1184 Universe::verify(/* allow dirty */ true, |
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1185 /* silent */ false, |
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1186 /* option */ VerifyOption_G1UsePrevMarking); |
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1187 } |
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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(); | |
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1205 if (G1TraceMarkStackOverflow) { |
342 | 1206 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1207 } |
342 | 1208 } else { |
2149 | 1209 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1210 // We're done with marking. |
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1211 // This is the end of the marking cycle, we're expected all |
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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) { | |
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1217 HandleMark hm; // handle scope |
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1218 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1219 Universe::heap()->prepare_for_verify(); |
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1220 Universe::verify(/* allow dirty */ true, |
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1221 /* silent */ false, |
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1222 /* option */ VerifyOption_G1UseNextMarking); |
811 | 1223 } |
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1224 assert(!restart_for_overflow(), "sanity"); |
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1225 } |
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1226 |
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1227 // Reset the marking state if marking completed |
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1228 if (!restart_for_overflow()) { |
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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 | |
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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); | |
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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) { |
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1323 if (!_final && _regions_done == 0) { |
342 | 1324 _start_vtime_sec = os::elapsedVTime(); |
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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 | |
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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. | |
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1418 if (start_card_num != -1) { |
342 | 1419 mark_card_num_range(start_card_num, last_card_num); |
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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; | |
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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, | |
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1497 BitMap* region_bm, BitMap* card_bm) |
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1498 : AbstractGangTask("G1 final counting"), _g1h(g1h), |
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1499 _bm(bm), _region_bm(region_bm), _card_bm(card_bm), |
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1500 _n_workers(0) |
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1501 { |
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1502 // Use the value already set as the number of active threads |
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1503 // in the call to run_task(). Needed for the allocation of |
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1504 // _live_bytes and _used_bytes. |
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1505 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1506 assert( _g1h->workers()->active_workers() > 0, |
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1507 "Should have been previously set"); |
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1508 _n_workers = _g1h->workers()->active_workers(); |
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1509 } else { |
342 | 1510 _n_workers = 1; |
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1511 } |
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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 | |
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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(); |
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1527 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1528 _g1h->heap_region_par_iterate_chunked(&calccl, worker_id, |
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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 | |
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1536 assert(worker_id < _n_workers, "invariant"); |
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1537 _live_bytes[worker_id] = calccl.tot_live(); |
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1538 _used_bytes[worker_id] = calccl.tot_used(); |
342 | 1539 } |
1540 size_t live_bytes() { | |
1541 size_t live_bytes = 0; | |
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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; | |
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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, |
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1575 HRRSCleanupTask* hrrs_cleanup_task) : |
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1576 _g1(g1), _worker_num(worker_num), |
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1577 _max_live_bytes(0), _regions_claimed(0), |
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1578 _freed_bytes(0), |
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1579 _claimed_region_time(0.0), _max_region_time(0.0), |
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1580 _local_cleanup_list(local_cleanup_list), |
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1581 _old_proxy_set(old_proxy_set), |
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1582 _humongous_proxy_set(humongous_proxy_set), |
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1583 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1584 |
342 | 1585 size_t freed_bytes() { return _freed_bytes; } |
1586 | |
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1587 bool doHeapRegion(HeapRegion *hr) { |
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1588 // We use a claim value of zero here because all regions |
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1589 // were claimed with value 1 in the FinalCount task. |
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1590 hr->reset_gc_time_stamp(); |
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1591 if (!hr->continuesHumongous()) { |
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1592 double start = os::elapsedTime(); |
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1593 _regions_claimed++; |
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1594 hr->note_end_of_marking(); |
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1595 _max_live_bytes += hr->max_live_bytes(); |
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1596 _g1->free_region_if_empty(hr, |
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1597 &_freed_bytes, |
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1598 _local_cleanup_list, |
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1599 _old_proxy_set, |
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1600 _humongous_proxy_set, |
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1601 _hrrs_cleanup_task, |
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1602 true /* par */); |
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1603 double region_time = (os::elapsedTime() - start); |
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1604 _claimed_region_time += region_time; |
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1605 if (region_time > _max_region_time) { |
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1606 _max_region_time = region_time; |
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1607 } |
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1608 } |
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1609 return false; |
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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 |
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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; | |
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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); | |
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1643 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1644 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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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 |
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1663 // If we iterate over the global cleanup list at the end of |
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1664 // cleanup to do this printing we will not guarantee to only |
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1665 // generate output for the newly-reclaimed regions (the list |
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1666 // might not be empty at the beginning of cleanup; we might |
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1667 // still be working on its previous contents). So we do the |
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1668 // printing here, before we append the new regions to the global |
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1669 // cleanup list. |
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1670 |
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1671 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1672 if (hr_printer->is_active()) { |
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1673 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1674 while (iter.more_available()) { |
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1675 HeapRegion* hr = iter.get_next(); |
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1676 hr_printer->cleanup(hr); |
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1677 } |
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1678 } |
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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] " | |
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1688 "claimed %u regions (tot = %8.3f ms, max = %8.3f ms).\n", |
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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 | |
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1711 void work(uint worker_id) { |
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1712 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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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 | |
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1737 if (VerifyDuringGC) { |
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1738 HandleMark hm; // handle scope |
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1739 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1740 Universe::heap()->prepare_for_verify(); |
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1741 Universe::verify(/* allow dirty */ true, |
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1742 /* silent */ false, |
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1743 /* option */ VerifyOption_G1UsePrevMarking); |
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1744 } |
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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 | |
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1753 uint n_workers; |
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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); | |
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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(); | |
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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); |
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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 | |
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1787 ergo_verbose4(ErgoConcCycles, |
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1788 "finish cleanup", |
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1789 ergo_format_byte("occupancy") |
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1790 ergo_format_byte("capacity") |
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1791 ergo_format_byte_perc("known garbage"), |
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1792 start_used_bytes, g1h->capacity(), |
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1793 known_garbage_bytes, |
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1794 ((double) known_garbage_bytes / (double) g1h->capacity()) * 100.0); |
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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 | |
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1805 if (G1PrintRegionLivenessInfo) { |
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1806 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1807 _g1h->heap_region_iterate(&cl); |
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1808 } |
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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); |
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1818 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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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); | |
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1846 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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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. | |
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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 | |
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1881 // Clean up will have freed any regions completely full of garbage. |
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1882 // Update the soft reference policy with the new heap occupancy. |
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1883 Universe::update_heap_info_at_gc(); |
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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) { |
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1890 HandleMark hm; // handle scope |
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1891 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1892 Universe::heap()->prepare_for_verify(); |
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1893 Universe::verify(/* allow dirty */ true, |
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1894 /* silent */ false, |
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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"); | |
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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 | |
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1956 // Support closures for reference procssing in G1 |
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1957 |
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1958 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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1959 HeapWord* addr = (HeapWord*)obj; |
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1960 return addr != NULL && |
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1961 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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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 | |
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1974 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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1975 virtual void do_oop( oop* p) { do_oop_work(p); } |
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1976 |
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1977 template <class T> void do_oop_work(T* p) { |
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1978 oop obj = oopDesc::load_decode_heap_oop(p); |
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1979 HeapWord* addr = (HeapWord*)obj; |
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1980 |
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1981 if (_cm->verbose_high()) { |
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1982 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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1983 "*"PTR_FORMAT" = "PTR_FORMAT, |
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1984 p, (void*) obj); |
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1985 } |
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1986 |
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1987 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
342 | 1988 _bitMap->mark(addr); |
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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 | |
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2011 // 'Keep Alive' closure used by parallel reference processing. |
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2012 // An instance of this closure is used in the parallel reference processing |
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2013 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2014 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2015 // placed on to discovered ref lists once so we can mark and push with no |
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2016 // need to check whether the object has already been marked. Using the |
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2017 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2018 // operating on the global mark stack. This means that an individual |
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2019 // worker would be doing lock-free pushes while it processes its own |
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2020 // discovered ref list followed by drain call. If the discovered ref lists |
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2021 // are unbalanced then this could cause interference with the other |
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2022 // workers. Using a CMTask (and its embedded local data structures) |
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2023 // avoids that potential interference. |
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2024 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2025 ConcurrentMark* _cm; |
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2026 CMTask* _task; |
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2027 int _ref_counter_limit; |
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2028 int _ref_counter; |
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2029 public: |
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2030 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2031 _cm(cm), _task(task), |
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2032 _ref_counter_limit(G1RefProcDrainInterval) { |
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2033 assert(_ref_counter_limit > 0, "sanity"); |
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2034 _ref_counter = _ref_counter_limit; |
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2035 } |
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2036 |
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2037 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2038 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2039 |
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2040 template <class T> void do_oop_work(T* p) { |
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2041 if (!_cm->has_overflown()) { |
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2042 oop obj = oopDesc::load_decode_heap_oop(p); |
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2043 if (_cm->verbose_high()) { |
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2044 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2045 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2046 _task->task_id(), p, (void*) obj); |
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2047 } |
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2048 |
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2049 _task->deal_with_reference(obj); |
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2050 _ref_counter--; |
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2051 |
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2052 if (_ref_counter == 0) { |
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2053 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2054 // reachable from them on to the local stack (and possibly the global stack). |
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2055 // Call do_marking_step() to process these entries. We call the routine in a |
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2056 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2057 // with the entries that we've pushed as a result of the deal_with_reference |
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2058 // calls above) or we overflow. |
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2059 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2060 // while there may still be some work to do. (See the comment at the |
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2061 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2062 // is reaching the specified time target.) It is only when |
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2063 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2064 // that the marking has completed. |
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2065 do { |
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2066 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2067 _task->do_marking_step(mark_step_duration_ms, |
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2068 false /* do_stealing */, |
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2069 false /* do_termination */); |
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2070 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2071 _ref_counter = _ref_counter_limit; |
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2072 } |
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2073 } else { |
3776
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2074 if (_cm->verbose_high()) { |
2174
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2075 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
3776
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2076 } |
2174
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2077 } |
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2078 } |
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2079 }; |
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2080 |
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2081 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
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2082 ConcurrentMark* _cm; |
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2083 CMTask* _task; |
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2084 public: |
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2085 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
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2086 _cm(cm), _task(task) |
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2087 {} |
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2088 |
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2089 void do_void() { |
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2090 do { |
3776
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2091 if (_cm->verbose_high()) { |
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2092 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
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2093 _task->task_id()); |
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2094 } |
2174
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2095 |
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2096 // We call CMTask::do_marking_step() to completely drain the local and |
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2097 // global marking stacks. The routine is called in a loop, which we'll |
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2098 // exit if there's nothing more to do (i.e. we'completely drained the |
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2099 // entries that were pushed as a result of applying the |
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2100 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
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2101 // lists above) or we overflow the global marking stack. |
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2102 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2103 // while there may still be some work to do. (See the comment at the |
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2104 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2105 // is reaching the specified time target.) It is only when |
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2106 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2107 // that the marking has completed. |
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|
2108 |
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2109 _task->do_marking_step(1000000000.0 /* something very large */, |
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2110 true /* do_stealing */, |
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2111 true /* do_termination */); |
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2112 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2113 } |
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|
2114 }; |
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2115 |
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2116 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2117 // reference processing at the end of G1 concurrent marking |
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|
2118 |
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2119 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
2174
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2120 private: |
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|
2121 G1CollectedHeap* _g1h; |
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|
2122 ConcurrentMark* _cm; |
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2123 WorkGang* _workers; |
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|
2124 int _active_workers; |
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2125 |
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2126 public: |
3979
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2127 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
2174
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2128 ConcurrentMark* cm, |
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|
2129 WorkGang* workers, |
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|
2130 int n_workers) : |
4093
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2131 _g1h(g1h), _cm(cm), |
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2132 _workers(workers), _active_workers(n_workers) { } |
2174
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2133 |
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|
2134 // Executes the given task using concurrent marking worker threads. |
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|
2135 virtual void execute(ProcessTask& task); |
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|
2136 virtual void execute(EnqueueTask& task); |
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|
2137 }; |
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|
2138 |
3979
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2139 class G1CMRefProcTaskProxy: public AbstractGangTask { |
2174
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|
2140 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
234761c55641
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|
2141 ProcessTask& _proc_task; |
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|
2142 G1CollectedHeap* _g1h; |
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|
2143 ConcurrentMark* _cm; |
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|
2144 |
234761c55641
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|
2145 public: |
3979
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|
2146 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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|
2147 G1CollectedHeap* g1h, |
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|
2148 ConcurrentMark* cm) : |
2174
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|
2149 AbstractGangTask("Process reference objects in parallel"), |
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|
2150 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
2174
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|
2151 |
4728
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jmasa
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|
2152 virtual void work(uint worker_id) { |
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|
2153 CMTask* marking_task = _cm->task(worker_id); |
2174
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|
2154 G1CMIsAliveClosure g1_is_alive(_g1h); |
4093
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2155 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
2174
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|
2156 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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|
2157 |
4728
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|
2158 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
2174
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|
2159 } |
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|
2160 }; |
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|
2161 |
3979
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|
2162 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
2174
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|
2163 assert(_workers != NULL, "Need parallel worker threads."); |
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|
2164 |
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|
2165 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
2174
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|
2166 |
234761c55641
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|
2167 // We need to reset the phase for each task execution so that |
234761c55641
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|
2168 // the termination protocol of CMTask::do_marking_step works. |
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|
2169 _cm->set_phase(_active_workers, false /* concurrent */); |
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|
2170 _g1h->set_par_threads(_active_workers); |
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|
2171 _workers->run_task(&proc_task_proxy); |
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|
2172 _g1h->set_par_threads(0); |
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|
2173 } |
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|
2174 |
3979
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|
2175 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
2174
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|
2176 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
234761c55641
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|
2177 EnqueueTask& _enq_task; |
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|
2178 |
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|
2179 public: |
3979
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|
2180 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
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|
2181 AbstractGangTask("Enqueue reference objects in parallel"), |
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|
2182 _enq_task(enq_task) { } |
2174
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|
2183 |
4728
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|
2184 virtual void work(uint worker_id) { |
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|
2185 _enq_task.work(worker_id); |
2174
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|
2186 } |
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|
2187 }; |
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|
2188 |
3979
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|
2189 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
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|
2190 assert(_workers != NULL, "Need parallel worker threads."); |
234761c55641
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|
2191 |
3979
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|
2192 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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|
2193 |
234761c55641
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|
2194 _g1h->set_par_threads(_active_workers); |
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2195 _workers->run_task(&enq_task_proxy); |
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2196 _g1h->set_par_threads(0); |
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2197 } |
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2198 |
342 | 2199 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
2200 ResourceMark rm; | |
2201 HandleMark hm; | |
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2202 |
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2203 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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2204 |
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2205 // Is alive closure. |
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2206 G1CMIsAliveClosure g1_is_alive(g1h); |
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2207 |
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2208 // Inner scope to exclude the cleaning of the string and symbol |
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2209 // tables from the displayed time. |
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2210 { |
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2211 bool verbose = PrintGC && PrintGCDetails; |
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2212 if (verbose) { |
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2213 gclog_or_tty->put(' '); |
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2214 } |
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2215 TraceTime t("GC ref-proc", verbose, false, gclog_or_tty); |
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2216 |
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2217 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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2218 |
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2219 // See the comment in G1CollectedHeap::ref_processing_init() |
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2220 // about how reference processing currently works in G1. |
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2221 |
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2222 // Process weak references. |
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2223 rp->setup_policy(clear_all_soft_refs); |
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2224 assert(_markStack.isEmpty(), "mark stack should be empty"); |
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2225 |
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2226 G1CMKeepAliveClosure g1_keep_alive(g1h, this, nextMarkBitMap()); |
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2227 G1CMDrainMarkingStackClosure |
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2228 g1_drain_mark_stack(nextMarkBitMap(), &_markStack, &g1_keep_alive); |
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2229 |
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2230 // We use the work gang from the G1CollectedHeap and we utilize all |
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2231 // the worker threads. |
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2232 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
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2233 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
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2234 |
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2235 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
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2236 g1h->workers(), active_workers); |
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2237 |
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2238 if (rp->processing_is_mt()) { |
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2239 // Set the degree of MT here. If the discovery is done MT, there |
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2240 // may have been a different number of threads doing the discovery |
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2241 // and a different number of discovered lists may have Ref objects. |
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2242 // That is OK as long as the Reference lists are balanced (see |
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2243 // balance_all_queues() and balance_queues()). |
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2244 rp->set_active_mt_degree(active_workers); |
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2245 |
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2246 rp->process_discovered_references(&g1_is_alive, |
2174
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2247 &g1_keep_alive, |
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2248 &g1_drain_mark_stack, |
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2249 &par_task_executor); |
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2250 |
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2251 // The work routines of the parallel keep_alive and drain_marking_stack |
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2252 // will set the has_overflown flag if we overflow the global marking |
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2253 // stack. |
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2254 } else { |
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2255 rp->process_discovered_references(&g1_is_alive, |
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2256 &g1_keep_alive, |
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2257 &g1_drain_mark_stack, |
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2258 NULL); |
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2259 } |
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2260 |
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2261 assert(_markStack.overflow() || _markStack.isEmpty(), |
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2262 "mark stack should be empty (unless it overflowed)"); |
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2263 if (_markStack.overflow()) { |
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2264 // Should have been done already when we tried to push an |
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2265 // entry on to the global mark stack. But let's do it again. |
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2266 set_has_overflown(); |
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2267 } |
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2268 |
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2269 if (rp->processing_is_mt()) { |
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2270 assert(rp->num_q() == active_workers, "why not"); |
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2271 rp->enqueue_discovered_references(&par_task_executor); |
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2272 } else { |
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2273 rp->enqueue_discovered_references(); |
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2274 } |
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2275 |
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2276 rp->verify_no_references_recorded(); |
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2277 assert(!rp->discovery_enabled(), "Post condition"); |
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2278 } |
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2279 |
2177
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2280 // Now clean up stale oops in StringTable |
2037
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2281 StringTable::unlink(&g1_is_alive); |
2177
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2282 // Clean up unreferenced symbols in symbol table. |
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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: | |
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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. | |
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2300 if (worker_id < _cm->active_tasks()) { |
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2301 CMTask* task = _cm->task(worker_id); |
342 | 2302 task->record_start_time(); |
2303 do { | |
2174
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2304 task->do_marking_step(1000000000.0 /* something very large */, |
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2305 true /* do_stealing */, |
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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) : |
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2315 AbstractGangTask("Par Remark"), _cm(cm) { |
4711 | 2316 _cm->terminator()->reset_for_reuse(active_workers); |
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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
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2327 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2328 G1CollectedHeap::StrongRootsScope srs(g1h); |
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2329 // this is remark, so we'll use up all active threads |
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2330 uint active_workers = g1h->workers()->active_workers(); |
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2331 if (active_workers == 0) { |
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2332 assert(active_workers > 0, "Should have been set earlier"); |
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2333 active_workers = (uint) ParallelGCThreads; |
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2334 g1h->workers()->set_active_workers(active_workers); |
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2335 } |
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2336 set_phase(active_workers, false /* concurrent */); |
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2337 // Leave _parallel_marking_threads at it's |
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2338 // value originally calculated in the ConcurrentMark |
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2339 // constructor and pass values of the active workers |
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2340 // through the gang in the task. |
342 | 2341 |
4711 | 2342 CMRemarkTask remarkTask(this, active_workers); |
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2343 g1h->set_par_threads(active_workers); |
342 | 2344 g1h->workers()->run_task(&remarkTask); |
2345 g1h->set_par_threads(0); | |
2346 } else { | |
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2347 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2348 // this is remark, so we'll use up all available threads |
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2349 uint active_workers = 1; |
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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 } | |
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2358 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
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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
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|
2381 VerifyOption _vo; |
1388 | 2382 bool _all; |
342 | 2383 |
2384 public: | |
3772
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3771
diff
changeset
|
2385 PrintReachableOopClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2386 VerifyOption vo, |
1388 | 2387 bool all) : |
1044 | 2388 _g1h(G1CollectedHeap::heap()), |
3772
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diff
changeset
|
2389 _out(out), _vo(vo), _all(all) { } |
342 | 2390 |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2391 void do_oop(narrowOop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
2392 void do_oop( oop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2393 |
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diff
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|
2394 template <class T> void do_oop_work(T* p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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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
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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
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3771
diff
changeset
|
2409 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2410 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
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diff
changeset
|
2411 over_tams = hr->obj_allocated_since_prev_marking(obj); |
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7004681: G1: Extend marking verification to Full GCs
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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
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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
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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
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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
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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
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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
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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
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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
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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() { | |
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2657 guarantee(false, "drainAllSATBBuffers(): don't call this any more"); |
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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()) { | |
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2664 if (verbose_medium()) { |
342 | 2665 gclog_or_tty->print_cr("[global] processed an SATB buffer"); |
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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); | |
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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 | |
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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); | |
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2690 } |
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2691 |
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2692 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2693 _nextMarkBitMap->clearRange(mr); |
2694 } | |
2695 | |
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2696 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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2697 clearRangePrevBitmap(mr); |
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2698 clearRangeNextBitmap(mr); |
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2699 } |
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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) { | |
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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 | |
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2753 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2754 |
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2755 if (verbose_low()) { |
342 | 2756 gclog_or_tty->print_cr("[%d] we were successful with region = " |
2757 PTR_FORMAT, task_num, curr_region); | |
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2758 } |
342 | 2759 |
2760 if (limit > bottom) { | |
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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); | |
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2764 } |
342 | 2765 return curr_region; |
2766 } else { | |
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2767 assert(limit == bottom, |
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2768 "the region limit should be at bottom"); |
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2769 if (verbose_low()) { |
342 | 2770 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
2771 "returning NULL", task_num, curr_region); | |
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2772 } |
342 | 2773 // we return NULL and the caller should try calling |
2774 // claim_region() again. | |
2775 return NULL; | |
2776 } | |
2777 } else { | |
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2778 assert(_finger > finger, "the finger should have moved forward"); |
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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); | |
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2784 } |
342 | 2785 |
2786 // read it again | |
2787 finger = _finger; | |
2788 } | |
2789 } | |
2790 | |
2791 return NULL; | |
2792 } | |
2793 | |
1835
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2794 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
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2795 guarantee(false, "invalidate_aborted_regions_in_cset(): " |
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2796 "don't call this any more"); |
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2797 |
1835
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2798 bool result = false; |
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2799 for (int i = 0; i < (int)_max_task_num; ++i) { |
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2800 CMTask* the_task = _tasks[i]; |
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2801 MemRegion mr = the_task->aborted_region(); |
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2802 if (mr.start() != NULL) { |
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2803 assert(mr.end() != NULL, "invariant"); |
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2804 assert(mr.word_size() > 0, "invariant"); |
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2805 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
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2806 assert(hr != NULL, "invariant"); |
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2807 if (hr->in_collection_set()) { |
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2808 // The region points into the collection set |
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2809 the_task->set_aborted_region(MemRegion()); |
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2810 result = true; |
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2811 } |
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2812 } |
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2813 } |
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2814 return result; |
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2815 } |
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2816 |
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2817 bool ConcurrentMark::has_aborted_regions() { |
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2818 for (int i = 0; i < (int)_max_task_num; ++i) { |
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2819 CMTask* the_task = _tasks[i]; |
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2820 MemRegion mr = the_task->aborted_region(); |
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2821 if (mr.start() != NULL) { |
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2822 assert(mr.end() != NULL, "invariant"); |
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2823 assert(mr.word_size() > 0, "invariant"); |
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2824 return true; |
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2825 } |
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2826 } |
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2827 return false; |
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2828 } |
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2829 |
342 | 2830 void ConcurrentMark::oops_do(OopClosure* cl) { |
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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()); | |
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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 | |
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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()); | |
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2844 } |
342 | 2845 |
2846 // ...then over the contents of the all the task queues. | |
2847 queue->oops_do(cl); | |
2848 } | |
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2849 } |
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2850 |
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2851 #ifndef PRODUCT |
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2852 enum VerifyNoCSetOopsPhase { |
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2853 VerifyNoCSetOopsStack, |
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2854 VerifyNoCSetOopsQueues, |
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2855 VerifyNoCSetOopsSATBCompleted, |
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2856 VerifyNoCSetOopsSATBThread |
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2857 }; |
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2858 |
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2859 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2860 private: |
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2861 G1CollectedHeap* _g1h; |
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2862 VerifyNoCSetOopsPhase _phase; |
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2863 int _info; |
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2864 |
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2865 const char* phase_str() { |
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2866 switch (_phase) { |
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2867 case VerifyNoCSetOopsStack: return "Stack"; |
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2868 case VerifyNoCSetOopsQueues: return "Queue"; |
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2869 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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2870 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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2871 default: ShouldNotReachHere(); |
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2872 } |
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2873 return NULL; |
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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
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parents:
4783
diff
changeset
|
2875 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
2876 void do_object_work(oop obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2877 guarantee(!_g1h->obj_in_cs(obj), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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|
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:
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diff
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|
2879 (void*) obj, phase_str(), _info)); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2880 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2881 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2882 public: |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2883 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
2884 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2885 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2886 _phase = phase; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2887 _info = info; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2888 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2889 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
2890 virtual void do_oop(oop* p) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2891 oop obj = oopDesc::load_decode_heap_oop(p); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
2892 do_object_work(obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2893 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2894 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2895 virtual void do_oop(narrowOop* p) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
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:
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|
2897 // stacks and SATB buffers. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2898 ShouldNotReachHere(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2899 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2900 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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changeset
|
2901 virtual void do_object(oop obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2902 do_object_work(obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2903 } |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
2904 }; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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|
2905 |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
2906 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
2907 bool verify_enqueued_buffers, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2908 bool verify_thread_buffers, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2909 bool verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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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:
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diff
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|
2911 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2912 return; |
342 | 2913 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
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|
2914 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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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:
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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:
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diff
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|
2919 cl.set_phase(VerifyNoCSetOopsStack); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
2920 _markStack.oops_do(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2921 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2922 // Verify entries on the task queues |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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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:
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|
2924 cl.set_phase(VerifyNoCSetOopsQueues, i); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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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:
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diff
changeset
|
2928 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
2929 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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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:
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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
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|
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
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3030 if (obj->is_objArray()) { |
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3031 _array_ind_stack[_ms_ind] = arr_ind; |
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3032 } |
342 | 3033 _ms_ind++; |
3034 return true; | |
3035 } | |
3036 | |
3037 oop pop() { | |
3776
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3038 if (_ms_ind == 0) { |
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3039 return NULL; |
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|
3040 } else { |
342 | 3041 _ms_ind--; |
3042 return _ms[_ms_ind]; | |
3043 } | |
3044 } | |
3045 | |
845
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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
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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: | |
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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
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3079 _array_increment(MAX2(ms_size/8, 16)), |
4728
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3080 _worker_id(worker_id) { } |
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3081 |
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3082 ~CSetMarkOopClosure() { |
342 | 3083 FREE_C_HEAP_ARRAY(oop, _ms); |
3084 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
3085 } | |
3086 | |
845
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3087 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3088 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3089 |
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3090 template <class T> void do_oop_work(T* p) { |
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3091 T heap_oop = oopDesc::load_heap_oop(p); |
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3092 if (oopDesc::is_null(heap_oop)) return; |
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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
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3105 if (_bm->parMark((HeapWord*)obj)) { |
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|
3106 if (!push(obj)) { |
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|
3107 gclog_or_tty->print_cr("Setting abort in CSetMarkOopClosure because push failed."); |
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3108 set_abort(); |
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|
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
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3120 class CSetMarkBitMapClosure: public BitMapClosure { |
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3121 G1CollectedHeap* _g1h; |
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3122 CMBitMap* _bitMap; |
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3123 ConcurrentMark* _cm; |
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3124 CSetMarkOopClosure _oop_cl; |
4728
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3125 uint _worker_id; |
4097
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3126 |
342 | 3127 public: |
4728
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3128 CSetMarkBitMapClosure(ConcurrentMark* cm, int ms_size, int worker_id) : |
342 | 3129 _g1h(G1CollectedHeap::heap()), |
3130 _bitMap(cm->nextMarkBitMap()), | |
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3131 _oop_cl(cm, ms_size, worker_id), |
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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
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|
3143 if (UseCompressedOops) { |
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3144 if (!_oop_cl.drain<narrowOop>()) return false; |
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|
3145 } else { |
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|
3146 if (!_oop_cl.drain<oop>()) return false; |
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3147 } |
342 | 3148 } |
3149 // Otherwise... | |
3150 return true; | |
3151 } | |
3152 }; | |
3153 | |
4097
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3154 class CompleteMarkingInCSetHRClosure: public HeapRegionClosure { |
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|
3155 CMBitMap* _bm; |
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|
3156 CSetMarkBitMapClosure _bit_cl; |
4728
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3157 uint _worker_id; |
4097
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3158 |
342 | 3159 enum SomePrivateConstants { |
3160 MSSize = 1000 | |
3161 }; | |
4097
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3162 |
342 | 3163 public: |
4728
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3164 CompleteMarkingInCSetHRClosure(ConcurrentMark* cm, int worker_id) : |
342 | 3165 _bm(cm->nextMarkBitMap()), |
4728
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3166 _bit_cl(cm, MSSize, worker_id), |
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3167 _worker_id(worker_id) { } |
4097
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|
3168 |
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|
3169 bool doHeapRegion(HeapRegion* hr) { |
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|
3170 if (hr->claimHeapRegion(HeapRegion::CompleteMarkCSetClaimValue)) { |
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3171 // The current worker has successfully claimed the region. |
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|
3172 if (!hr->evacuation_failed()) { |
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|
3173 MemRegion mr = MemRegion(hr->bottom(), hr->next_top_at_mark_start()); |
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|
3174 if (!mr.is_empty()) { |
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|
3175 bool done = false; |
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|
3176 while (!done) { |
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|
3177 done = _bm->iterate(&_bit_cl, mr); |
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3178 } |
342 | 3179 } |
3180 } | |
3181 } | |
3182 return false; | |
3183 } | |
3184 }; | |
3185 | |
4097
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|
3186 class G1ParCompleteMarkInCSetTask: public AbstractGangTask { |
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|
3187 protected: |
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|
3188 G1CollectedHeap* _g1h; |
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|
3189 ConcurrentMark* _cm; |
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|
3190 |
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|
3191 public: |
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|
3192 G1ParCompleteMarkInCSetTask(G1CollectedHeap* g1h, |
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|
3193 ConcurrentMark* cm) : |
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|
3194 AbstractGangTask("Complete Mark in CSet"), |
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|
3195 _g1h(g1h), _cm(cm) { } |
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3196 |
4728
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|
3197 void work(uint worker_id) { |
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3198 CompleteMarkingInCSetHRClosure cmplt(_cm, worker_id); |
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3199 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id); |
4097
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3200 _g1h->collection_set_iterate_from(hr, &cmplt); |
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|
3201 } |
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|
3202 }; |
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|
3203 |
342 | 3204 void ConcurrentMark::complete_marking_in_collection_set() { |
4787
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|
3205 guarantee(false, "complete_marking_in_collection_set(): " |
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|
3206 "don't call this any more"); |
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|
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(); | |
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3216 G1ParCompleteMarkInCSetTask complete_mark_task(g1h, this); |
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|
3217 |
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|
3218 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
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|
3219 |
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|
3220 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4711 | 3221 int n_workers = g1h->workers()->active_workers(); |
4097
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|
3222 g1h->set_par_threads(n_workers); |
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|
3223 g1h->workers()->run_task(&complete_mark_task); |
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|
3224 g1h->set_par_threads(0); |
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|
3225 } else { |
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|
3226 complete_mark_task.work(0); |
342 | 3227 } |
4093
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3228 |
4097
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|
3229 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::CompleteMarkCSetClaimValue), "sanity"); |
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3230 |
4783
023652e49ac0
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3231 // Reset the claim values in the regions in the collection set. |
023652e49ac0
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|
3232 g1h->reset_cset_heap_region_claim_values(); |
4097
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|
3233 |
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|
3234 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
4093
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|
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
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3255 guarantee(false, "newCSet(): don't call this any more"); |
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3256 |
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3257 if (!concurrent_marking_in_progress()) { |
342 | 3258 // nothing to do if marking is not in progress |
3259 return; | |
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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(); | |
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3267 if (task_finger != NULL && task_finger < _min_finger) { |
342 | 3268 _min_finger = task_finger; |
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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. | |
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3289 if (!region_stack_empty() || has_aborted_regions()) { |
342 | 3290 _should_gray_objects = true; |
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3291 } |
342 | 3292 } |
3293 | |
3294 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
4787
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3295 guarantee(false, "registerCSetRegion(): don't call this any more"); |
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3296 |
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3297 if (!concurrent_marking_in_progress()) return; |
342 | 3298 |
3299 HeapWord* region_end = hr->end(); | |
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3300 if (region_end > _min_finger) { |
342 | 3301 _should_gray_objects = true; |
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3302 } |
342 | 3303 } |
3304 | |
3378
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3305 // Resets the region fields of active CMTasks whose values point |
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3306 // into the collection set. |
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3307 void ConcurrentMark::reset_active_task_region_fields_in_cset() { |
4787
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3308 guarantee(false, "reset_active_task_region_fields_in_cset(): " |
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3309 "don't call this any more"); |
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3310 |
3378
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3311 assert(SafepointSynchronize::is_at_safepoint(), "should be in STW"); |
69293e516993
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3312 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
69293e516993
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3313 |
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3314 for (int i = 0; i < (int)parallel_marking_threads(); i += 1) { |
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3315 CMTask* task = _tasks[i]; |
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3316 HeapWord* task_finger = task->finger(); |
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3317 if (task_finger != NULL) { |
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3318 assert(_g1h->is_in_g1_reserved(task_finger), "not in heap"); |
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3319 HeapRegion* finger_region = _g1h->heap_region_containing(task_finger); |
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3320 if (finger_region->in_collection_set()) { |
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3321 // The task's current region is in the collection set. |
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3322 // This region will be evacuated in the current GC and |
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3323 // the region fields in the task will be stale. |
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3324 task->giveup_current_region(); |
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3325 } |
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|
3326 } |
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|
3327 } |
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|
3328 } |
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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
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3336 for (int i = 0; i < (int)_max_task_num; ++i) { |
342 | 3337 _tasks[i]->clear_region_fields(); |
1835
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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
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3343 // This can be called either during or outside marking, we'll read |
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3344 // the expected_active value from the SATB queue set. |
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3345 satb_mq_set.set_active_all_threads( |
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3346 false, /* new active value */ |
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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. |
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3397 bool ConcurrentMark::do_yield_check(uint worker_id) { |
342 | 3398 if (should_yield()) { |
4728
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3399 if (worker_id == 0) { |
342 | 3400 _g1h->g1_policy()->record_concurrent_pause(); |
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3401 } |
342 | 3402 cmThread()->yield(); |
4728
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3403 if (worker_id == 0) { |
342 | 3404 _g1h->g1_policy()->record_concurrent_pause_end(); |
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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) { | |
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3423 return containing_card_is_marked(start) && |
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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
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3480 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3481 assert( addr < _cm->finger(), "invariant"); |
342 | 3482 |
3483 if (_scanning_heap_region) { | |
3484 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
1023
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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
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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) { | |
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3531 // Separated the asserts so that we know which one fires. |
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3532 assert(hr != NULL, |
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3533 "claim_region() should have filtered out continues humongous regions"); |
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3534 assert(!hr->continuesHumongous(), |
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3535 "claim_region() should have filtered out continues humongous regions"); |
342 | 3536 |
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3537 if (_cm->verbose_low()) { |
342 | 3538 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
3539 _task_id, hr); | |
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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) { | |
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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); | |
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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) { | |
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3565 assert(limit >= _finger, "peace of mind"); |
342 | 3566 } else { |
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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() { | |
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3585 assert(_curr_region != NULL, "invariant"); |
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3586 if (_cm->verbose_low()) { |
342 | 3587 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
3588 _task_id, _curr_region); | |
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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) { |
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3613 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3614 |
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3615 if (_cm->verbose_low()) { |
342 | 3616 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
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3617 } |
342 | 3618 |
3619 _nextMarkBitMap = nextMarkBitMap; | |
3620 clear_region_fields(); | |
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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() { | |
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3663 assert(_words_scanned >= _words_scanned_limit || |
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3664 _refs_reached >= _refs_reached_limit , |
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3665 "shouldn't have been called otherwise"); |
342 | 3666 regular_clock_call(); |
3667 } | |
3668 | |
3669 void CMTask::regular_clock_call() { | |
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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. | |
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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_ | |
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3700 if (_words_scanned >= _words_scanned_limit) { |
342 | 3701 ++_clock_due_to_scanning; |
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3702 } |
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3703 if (_refs_reached >= _refs_reached_limit) { |
342 | 3704 ++_clock_due_to_marking; |
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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()) { | |
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3712 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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3713 "scanned = %d%s, refs reached = %d%s", |
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3714 _task_id, last_interval_ms, |
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3715 _words_scanned, |
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3716 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3717 _refs_reached, |
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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(); | |
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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()) { | |
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3745 if (_cm->verbose_low()) { |
342 | 3746 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
3747 _task_id); | |
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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
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3771 if (_cm->verbose_medium()) { |
342 | 3772 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
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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
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3799 if (_cm->verbose_low()) { |
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3800 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
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3801 _task_id); |
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3802 } |
342 | 3803 set_has_aborted(); |
3804 } else { | |
3805 // the transfer was successful | |
3806 | |
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3807 if (_cm->verbose_medium()) { |
342 | 3808 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
3809 _task_id, n); | |
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3810 } |
342 | 3811 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3812 if (tmp_size > _global_max_size) { |
342 | 3813 _global_max_size = tmp_size; |
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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); | |
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3829 assert(n <= global_stack_transfer_size, |
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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 ); | |
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3835 if (_cm->verbose_medium()) { |
342 | 3836 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
3837 _task_id, n); | |
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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. | |
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3843 assert(success, "invariant"); |
342 | 3844 } |
3845 | |
3846 statsOnly( int tmp_size = _task_queue->size(); | |
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3847 if (tmp_size > _local_max_size) { |
342 | 3848 _local_max_size = tmp_size; |
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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) { | |
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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; | |
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3864 if (partially) { |
342 | 3865 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3866 } else { |
342 | 3867 target_size = 0; |
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3868 } |
342 | 3869 |
3870 if (_task_queue->size() > target_size) { | |
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3871 if (_cm->verbose_high()) { |
342 | 3872 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
3873 _task_id, target_size); | |
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3874 } |
342 | 3875 |
3876 oop obj; | |
3877 bool ret = _task_queue->pop_local(obj); | |
3878 while (ret) { | |
3879 statsOnly( ++_local_pops ); | |
3880 | |
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3881 if (_cm->verbose_high()) { |
342 | 3882 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
3883 (void*) obj); | |
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3884 } |
342 | 3885 |
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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 | |
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3892 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3893 ret = false; |
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3894 } else { |
342 | 3895 ret = _task_queue->pop_local(obj); |
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3896 } |
342 | 3897 } |
3898 | |
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3899 if (_cm->verbose_high()) { |
342 | 3900 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
3901 _task_id, _task_queue->size()); | |
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3902 } |
342 | 3903 } |
3904 } | |
3905 | |
3906 void CMTask::drain_global_stack(bool partially) { | |
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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. | |
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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; | |
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3920 if (partially) { |
342 | 3921 target_size = _cm->partial_mark_stack_size_target(); |
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3922 } else { |
342 | 3923 target_size = 0; |
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3924 } |
342 | 3925 |
3926 if (_cm->mark_stack_size() > target_size) { | |
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3927 if (_cm->verbose_low()) { |
342 | 3928 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
3929 _task_id, target_size); | |
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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 | |
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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()); | |
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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() { | |
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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(); | |
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3959 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3960 satb_mq_set.set_par_closure(_task_id, &oc); |
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3961 } else { |
342 | 3962 satb_mq_set.set_closure(&oc); |
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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. | |
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3967 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3968 while (!has_aborted() && |
3969 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
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3970 if (_cm->verbose_medium()) { |
342 | 3971 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
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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()) { | |
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3979 if (_cm->verbose_medium()) { |
342 | 3980 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
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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. | |
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3989 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3990 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
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3991 } else { |
342 | 3992 satb_mq_set.iterate_closure_all_threads(); |
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3993 } |
342 | 3994 } |
3995 | |
3996 _draining_satb_buffers = false; | |
3997 | |
1023
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3998 assert(has_aborted() || |
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3999 concurrent() || |
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4000 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 4001 |
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4002 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4003 satb_mq_set.set_par_closure(_task_id, NULL); |
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4004 } else { |
342 | 4005 satb_mq_set.set_closure(NULL); |
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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
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4014 assert(_cm->region_stack_empty(), "region stack should be empty"); |
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4015 assert(_aborted_region.is_empty(), "aborted region should be empty"); |
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4016 return; |
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4017 |
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4018 if (has_aborted()) return; |
342 | 4019 |
1023
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4020 assert(_region_finger == NULL, |
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4021 "it should be NULL when we're not scanning a region"); |
342 | 4022 |
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4023 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
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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()); | |
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4027 } |
342 | 4028 |
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4029 MemRegion mr; |
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4030 |
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4031 if (!_aborted_region.is_empty()) { |
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4032 mr = _aborted_region; |
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4033 _aborted_region = MemRegion(); |
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4034 |
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4035 if (_cm->verbose_low()) { |
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4036 gclog_or_tty->print_cr("[%d] scanning aborted region " |
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4037 "[ " PTR_FORMAT ", " PTR_FORMAT " )", |
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4038 _task_id, mr.start(), mr.end()); |
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4039 } |
1835
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4040 } else { |
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4041 mr = _cm->region_stack_pop_lock_free(); |
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4042 // it returns MemRegion() if the pop fails |
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4043 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
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4044 } |
342 | 4045 |
4046 while (mr.start() != NULL) { | |
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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()); | |
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4051 } |
1835
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|
4052 |
1023
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4053 assert(mr.end() <= _cm->finger(), |
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|
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
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|
4057 assert(!has_aborted(), |
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|
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(); | |
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4062 if (has_aborted()) { |
342 | 4063 mr = MemRegion(); |
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4064 } else { |
1835
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|
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 { | |
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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. | |
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4077 assert(_region_finger != NULL, "invariant"); |
342 | 4078 |
1835
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4079 // Make sure that any previously aborted region has been |
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|
4080 // cleared. |
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|
4081 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
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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
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|
4095 gclog_or_tty->print_cr("[%d] recording unscanned region" |
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|
4096 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
342 | 4097 _task_id, |
4098 newRegion.start(), newRegion.end()); | |
4099 } | |
1835
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4100 // Now record the part of the region we didn't scan to |
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|
4101 // make sure this task scans it later. |
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4102 _aborted_region = newRegion; |
342 | 4103 } |
4104 // break from while | |
4105 mr = MemRegion(); | |
4106 } | |
4107 _region_finger = NULL; | |
4108 } | |
4109 | |
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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()); | |
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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 | |
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4267 void CMTask::do_marking_step(double time_target_ms, |
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4268 bool do_stealing, |
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4269 bool do_termination) { |
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4270 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4271 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4272 |
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4273 assert(concurrent() || _cm->region_stack_empty(), |
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4274 "the region stack should have been cleared before remark"); |
1835
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4275 assert(concurrent() || !_cm->has_aborted_regions(), |
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4276 "aborted regions should have been cleared before remark"); |
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4277 assert(_region_finger == NULL, |
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4278 "this should be non-null only when a region is being scanned"); |
342 | 4279 |
4280 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
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4281 assert(_task_queues != NULL, "invariant"); |
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4282 assert(_task_queue != NULL, "invariant"); |
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4283 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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4284 |
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4285 assert(!_claimed, |
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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(); | |
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4309 _has_timed_out = false; |
342 | 4310 _draining_satb_buffers = false; |
4311 | |
4312 ++_calls; | |
4313 | |
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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); | |
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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. | |
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4358 assert(_finger != NULL, "if region is not NULL, then the finger " |
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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 | |
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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); | |
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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 { | |
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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. | |
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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). | |
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4407 assert(_finger < _region_limit, "invariant"); |
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4408 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
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4409 // Check if bitmap iteration was aborted while scanning the last object |
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4410 if (new_finger >= _region_limit) { |
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4411 giveup_current_region(); |
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4412 } else { |
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4413 move_finger_to(new_finger); |
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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. | |
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4432 // Separated the asserts so that we know which one fires. |
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4433 assert(_curr_region == NULL, "invariant"); |
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4434 assert(_finger == NULL, "invariant"); |
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4435 assert(_region_limit == NULL, "invariant"); |
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4436 if (_cm->verbose_low()) { |
342 | 4437 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
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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 | |
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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); | |
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4448 } |
342 | 4449 |
4450 setup_for_region(claimed_region); | |
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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) { | |
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4462 assert(_cm->out_of_regions(), |
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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
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4469 // tasks might be pushing objects to it concurrently. We also cannot |
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4470 // check if the region stack is empty because if a thread is aborting |
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|
4471 // it can push a partially done region back. |
1023
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|
4472 assert(_cm->out_of_regions(), |
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|
4473 "at this point we should be out of regions"); |
342 | 4474 |
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|
4475 if (_cm->verbose_low()) { |
342 | 4476 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
3776
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|
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
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|
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, ...)
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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, ...)
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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, ...)
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diff
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|
4497 // it can push a partially done region back. |
1023
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|
4498 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
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|
4499 "only way to reach here"); |
342 | 4500 |
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|
4501 if (_cm->verbose_low()) { |
342 | 4502 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
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|
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)) { | |
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|
4510 if (_cm->verbose_medium()) { |
342 | 4511 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
4512 _task_id, (void*) obj); | |
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4513 } |
342 | 4514 |
4515 statsOnly( ++_steals ); | |
4516 | |
1023
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|
4517 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
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|
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.
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|
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.
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|
4532 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4533 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
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.
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|
4535 _cm->set_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4536 regular_clock_call(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4537 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4538 } |
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7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4539 |
342 | 4540 // We still haven't aborted. Now, let's try to get into the |
4541 // termination protocol. | |
2174
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|
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, ...)
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diff
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|
4544 // tasks might be concurrently pushing objects on it. We also cannot |
afc1ce1efe66
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diff
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|
4545 // check if the region stack is empty because if a thread is aborting |
afc1ce1efe66
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|
4546 // it can push a partially done region back. |
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|
4547 // Separated the asserts so that we know which one fires. |
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|
4548 assert(_cm->out_of_regions(), "only way to reach here"); |
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|
4549 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4550 |
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|
4551 if (_cm->verbose_low()) { |
342 | 4552 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
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|
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
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|
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
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changeset
|
4579 // all other tasks have finished. We separated the guarantees so |
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|
4580 // that, if a condition is false, we can immediately find out |
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|
4581 // which one. |
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|
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()
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|
4583 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
1023
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changeset
|
4584 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
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|
4585 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
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|
4586 guarantee(_task_queue->size() == 0, "only way to reach here"); |
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|
4587 guarantee(!_cm->has_overflown(), "only way to reach here"); |
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|
4588 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
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|
4589 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
342 | 4590 |
3776
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|
4591 if (_cm->verbose_low()) { |
342 | 4592 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
3776
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|
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
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|
4598 if (_cm->verbose_low()) { |
23d434c6290d
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changeset
|
4599 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4600 _task_id); |
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|
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
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|
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 | |
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|
4638 if (_cm->verbose_low()) { |
342 | 4639 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
3776
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|
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
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|
4663 if (_cm->has_aborted()) { |
342 | 4664 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
4665 _task_id); | |
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|
4666 } |
342 | 4667 } |
4668 } else { | |
3776
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|
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); | |
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|
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
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6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
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|
4690 _aborted_region(MemRegion()) { |
1023
11d4857fe5e1
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diff
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|
4691 guarantee(task_queue != NULL, "invariant"); |
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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
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|
4699 |
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|
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
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2369
diff
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|
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
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diff
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|
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
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2369
diff
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|
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
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diff
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|
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
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|
4705 // easier to compose. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4706 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
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
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diff
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|
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
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diff
changeset
|
4709 #define G1PPRL_LINE_PREFIX "###" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4710 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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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
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|
4712 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4713 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
371bbc844bf1
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|
4714 #else // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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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
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|
4716 #endif // _LP64 |
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|
4717 |
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|
4718 // For per-region info |
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|
4719 #define G1PPRL_TYPE_FORMAT " %-4s" |
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|
4720 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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|
4721 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
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|
4722 #define G1PPRL_BYTE_H_FORMAT " %9s" |
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|
4723 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
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|
4724 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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|
4725 |
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|
4726 // For summary info |
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|
4727 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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|
4728 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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|
4729 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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|
4730 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4731 |
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|
4732 G1PrintRegionLivenessInfoClosure:: |
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|
4733 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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|
4734 : _out(out), |
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|
4735 _total_used_bytes(0), _total_capacity_bytes(0), |
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|
4736 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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|
4737 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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|
4738 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
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|
4739 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
4740 MemRegion g1_committed = g1h->g1_committed(); |
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4741 MemRegion g1_reserved = g1h->g1_reserved(); |
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|
4742 double now = os::elapsedTime(); |
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|
4743 |
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|
4744 // Print the header of the output. |
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|
4745 _out->cr(); |
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|
4746 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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|
4747 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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|
4748 G1PPRL_SUM_ADDR_FORMAT("committed") |
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|
4749 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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|
4750 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
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|
4751 g1_committed.start(), g1_committed.end(), |
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|
4752 g1_reserved.start(), g1_reserved.end(), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
4753 HeapRegion::GrainBytes); |
2435
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|
4754 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4755 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4756 G1PPRL_TYPE_H_FORMAT |
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|
4757 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4758 G1PPRL_BYTE_H_FORMAT |
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|
4759 G1PPRL_BYTE_H_FORMAT |
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|
4760 G1PPRL_BYTE_H_FORMAT |
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|
4761 G1PPRL_DOUBLE_H_FORMAT, |
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|
4762 "type", "address-range", |
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|
4763 "used", "prev-live", "next-live", "gc-eff"); |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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|
4764 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4765 G1PPRL_TYPE_H_FORMAT |
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|
4766 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4767 G1PPRL_BYTE_H_FORMAT |
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|
4768 G1PPRL_BYTE_H_FORMAT |
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|
4769 G1PPRL_BYTE_H_FORMAT |
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|
4770 G1PPRL_DOUBLE_H_FORMAT, |
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3975
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|
4771 "", "", |
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|
4772 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
2435
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|
4773 } |
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|
4774 |
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|
4775 // It takes as a parameter a reference to one of the _hum_* fields, it |
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|
4776 // deduces the corresponding value for a region in a humongous region |
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|
4777 // series (either the region size, or what's left if the _hum_* field |
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|
4778 // is < the region size), and updates the _hum_* field accordingly. |
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|
4779 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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|
4780 size_t bytes = 0; |
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|
4781 // The > 0 check is to deal with the prev and next live bytes which |
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|
4782 // could be 0. |
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|
4783 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
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|
4784 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
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|
4785 *hum_bytes -= bytes; |
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|
4786 } |
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|
4787 return bytes; |
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diff
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|
4788 } |
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|
4789 |
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|
4790 // It deduces the values for a region in a humongous region series |
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|
4791 // from the _hum_* fields and updates those accordingly. It assumes |
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|
4792 // that that _hum_* fields have already been set up from the "starts |
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|
4793 // humongous" region and we visit the regions in address order. |
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|
4794 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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|
4795 size_t* capacity_bytes, |
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|
4796 size_t* prev_live_bytes, |
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|
4797 size_t* next_live_bytes) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4798 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4799 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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|
4800 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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|
4801 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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|
4802 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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|
4803 } |
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|
4804 |
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|
4805 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
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|
4806 const char* type = ""; |
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|
4807 HeapWord* bottom = r->bottom(); |
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|
4808 HeapWord* end = r->end(); |
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|
4809 size_t capacity_bytes = r->capacity(); |
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|
4810 size_t used_bytes = r->used(); |
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|
4811 size_t prev_live_bytes = r->live_bytes(); |
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|
4812 size_t next_live_bytes = r->next_live_bytes(); |
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|
4813 double gc_eff = r->gc_efficiency(); |
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|
4814 if (r->used() == 0) { |
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|
4815 type = "FREE"; |
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|
4816 } else if (r->is_survivor()) { |
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|
4817 type = "SURV"; |
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|
4818 } else if (r->is_young()) { |
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|
4819 type = "EDEN"; |
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|
4820 } else if (r->startsHumongous()) { |
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|
4821 type = "HUMS"; |
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|
4822 |
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|
4823 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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|
4824 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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|
4825 "they should have been zeroed after the last time we used them"); |
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|
4826 // Set up the _hum_* fields. |
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|
4827 _hum_capacity_bytes = capacity_bytes; |
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|
4828 _hum_used_bytes = used_bytes; |
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4829 _hum_prev_live_bytes = prev_live_bytes; |
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4830 _hum_next_live_bytes = next_live_bytes; |
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4831 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4832 &prev_live_bytes, &next_live_bytes); |
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4833 end = bottom + HeapRegion::GrainWords; |
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4834 } else if (r->continuesHumongous()) { |
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4835 type = "HUMC"; |
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4836 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4837 &prev_live_bytes, &next_live_bytes); |
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4838 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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4839 } else { |
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4840 type = "OLD"; |
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4841 } |
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4842 |
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4843 _total_used_bytes += used_bytes; |
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4844 _total_capacity_bytes += capacity_bytes; |
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4845 _total_prev_live_bytes += prev_live_bytes; |
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4846 _total_next_live_bytes += next_live_bytes; |
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4847 |
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4848 // Print a line for this particular region. |
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4849 _out->print_cr(G1PPRL_LINE_PREFIX |
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4850 G1PPRL_TYPE_FORMAT |
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4851 G1PPRL_ADDR_BASE_FORMAT |
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4852 G1PPRL_BYTE_FORMAT |
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4853 G1PPRL_BYTE_FORMAT |
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4854 G1PPRL_BYTE_FORMAT |
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4855 G1PPRL_DOUBLE_FORMAT, |
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4856 type, bottom, end, |
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4857 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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|
4858 |
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|
4859 return false; |
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|
4860 } |
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|
4861 |
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|
4862 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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4863 // Print the footer of the output. |
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4864 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4865 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4866 " SUMMARY" |
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|
4867 G1PPRL_SUM_MB_FORMAT("capacity") |
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4868 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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|
4869 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
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|
4870 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
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|
4871 bytes_to_mb(_total_capacity_bytes), |
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|
4872 bytes_to_mb(_total_used_bytes), |
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|
4873 perc(_total_used_bytes, _total_capacity_bytes), |
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|
4874 bytes_to_mb(_total_prev_live_bytes), |
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|
4875 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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|
4876 bytes_to_mb(_total_next_live_bytes), |
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|
4877 perc(_total_next_live_bytes, _total_capacity_bytes)); |
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|
4878 _out->cr(); |
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|
4879 } |