Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 3774:c9ca3f51cf41
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
Summary: Remove two unused parameters from the mem_allocate() method and update its uses accordingly.
Reviewed-by: stefank, johnc
author | tonyp |
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date | Thu, 16 Jun 2011 15:51:57 -0400 |
parents | 6747fd0512e0 |
children | 23d434c6290d |
rev | line source |
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342 | 1 /* |
2149 | 2 * Copyright (c) 2001, 2011, 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" | |
3771 | 31 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 32 #include "gc_implementation/g1/g1RemSet.hpp" |
33 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
34 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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35 #include "gc_implementation/shared/vmGCOperations.hpp" |
1972 | 36 #include "memory/genOopClosures.inline.hpp" |
37 #include "memory/referencePolicy.hpp" | |
38 #include "memory/resourceArea.hpp" | |
39 #include "oops/oop.inline.hpp" | |
40 #include "runtime/handles.inline.hpp" | |
41 #include "runtime/java.hpp" | |
342 | 42 |
43 // | |
44 // CMS Bit Map Wrapper | |
45 | |
46 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter): | |
47 _bm((uintptr_t*)NULL,0), | |
48 _shifter(shifter) { | |
49 _bmStartWord = (HeapWord*)(rs.base()); | |
50 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
51 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
52 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
53 | |
54 guarantee(brs.is_reserved(), "couldn't allocate CMS bit map"); | |
55 // For now we'll just commit all of the bit map up fromt. | |
56 // Later on we'll try to be more parsimonious with swap. | |
57 guarantee(_virtual_space.initialize(brs, brs.size()), | |
58 "couldn't reseve backing store for CMS bit map"); | |
59 assert(_virtual_space.committed_size() == brs.size(), | |
60 "didn't reserve backing store for all of CMS bit map?"); | |
61 _bm.set_map((uintptr_t*)_virtual_space.low()); | |
62 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
63 _bmWordSize, "inconsistency in bit map sizing"); | |
64 _bm.set_size(_bmWordSize >> _shifter); | |
65 } | |
66 | |
67 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
68 HeapWord* limit) const { | |
69 // First we must round addr *up* to a possible object boundary. | |
70 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
71 HeapWordSize << _shifter); | |
72 size_t addrOffset = heapWordToOffset(addr); | |
73 if (limit == NULL) limit = _bmStartWord + _bmWordSize; | |
74 size_t limitOffset = heapWordToOffset(limit); | |
75 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
76 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
77 assert(nextAddr >= addr, "get_next_one postcondition"); | |
78 assert(nextAddr == limit || isMarked(nextAddr), | |
79 "get_next_one postcondition"); | |
80 return nextAddr; | |
81 } | |
82 | |
83 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
84 HeapWord* limit) const { | |
85 size_t addrOffset = heapWordToOffset(addr); | |
86 if (limit == NULL) limit = _bmStartWord + _bmWordSize; | |
87 size_t limitOffset = heapWordToOffset(limit); | |
88 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
89 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
90 assert(nextAddr >= addr, "get_next_one postcondition"); | |
91 assert(nextAddr == limit || !isMarked(nextAddr), | |
92 "get_next_one postcondition"); | |
93 return nextAddr; | |
94 } | |
95 | |
96 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
97 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
98 return (int) (diff >> _shifter); | |
99 } | |
100 | |
101 bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) { | |
102 HeapWord* left = MAX2(_bmStartWord, mr.start()); | |
103 HeapWord* right = MIN2(_bmStartWord + _bmWordSize, mr.end()); | |
104 if (right > left) { | |
105 // Right-open interval [leftOffset, rightOffset). | |
106 return _bm.iterate(cl, heapWordToOffset(left), heapWordToOffset(right)); | |
107 } else { | |
108 return true; | |
109 } | |
110 } | |
111 | |
112 void CMBitMapRO::mostly_disjoint_range_union(BitMap* from_bitmap, | |
113 size_t from_start_index, | |
114 HeapWord* to_start_word, | |
115 size_t word_num) { | |
116 _bm.mostly_disjoint_range_union(from_bitmap, | |
117 from_start_index, | |
118 heapWordToOffset(to_start_word), | |
119 word_num); | |
120 } | |
121 | |
122 #ifndef PRODUCT | |
123 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
124 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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125 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
342 | 126 "size inconsistency"); |
127 return _bmStartWord == (HeapWord*)(rs.base()) && | |
128 _bmWordSize == rs.size()>>LogHeapWordSize; | |
129 } | |
130 #endif | |
131 | |
132 void CMBitMap::clearAll() { | |
133 _bm.clear(); | |
134 return; | |
135 } | |
136 | |
137 void CMBitMap::markRange(MemRegion mr) { | |
138 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
139 assert(!mr.is_empty(), "unexpected empty region"); | |
140 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
141 ((HeapWord *) mr.end())), | |
142 "markRange memory region end is not card aligned"); | |
143 // convert address range into offset range | |
144 _bm.at_put_range(heapWordToOffset(mr.start()), | |
145 heapWordToOffset(mr.end()), true); | |
146 } | |
147 | |
148 void CMBitMap::clearRange(MemRegion mr) { | |
149 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
150 assert(!mr.is_empty(), "unexpected empty region"); | |
151 // convert address range into offset range | |
152 _bm.at_put_range(heapWordToOffset(mr.start()), | |
153 heapWordToOffset(mr.end()), false); | |
154 } | |
155 | |
156 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
157 HeapWord* end_addr) { | |
158 HeapWord* start = getNextMarkedWordAddress(addr); | |
159 start = MIN2(start, end_addr); | |
160 HeapWord* end = getNextUnmarkedWordAddress(start); | |
161 end = MIN2(end, end_addr); | |
162 assert(start <= end, "Consistency check"); | |
163 MemRegion mr(start, end); | |
164 if (!mr.is_empty()) { | |
165 clearRange(mr); | |
166 } | |
167 return mr; | |
168 } | |
169 | |
170 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
171 _base(NULL), _cm(cm) | |
172 #ifdef ASSERT | |
173 , _drain_in_progress(false) | |
174 , _drain_in_progress_yields(false) | |
175 #endif | |
176 {} | |
177 | |
178 void CMMarkStack::allocate(size_t size) { | |
179 _base = NEW_C_HEAP_ARRAY(oop, size); | |
180 if (_base == NULL) | |
181 vm_exit_during_initialization("Failed to allocate " | |
182 "CM region mark stack"); | |
183 _index = 0; | |
184 // QQQQ cast ... | |
185 _capacity = (jint) size; | |
186 _oops_do_bound = -1; | |
187 NOT_PRODUCT(_max_depth = 0); | |
188 } | |
189 | |
190 CMMarkStack::~CMMarkStack() { | |
191 if (_base != NULL) FREE_C_HEAP_ARRAY(oop, _base); | |
192 } | |
193 | |
194 void CMMarkStack::par_push(oop ptr) { | |
195 while (true) { | |
196 if (isFull()) { | |
197 _overflow = true; | |
198 return; | |
199 } | |
200 // Otherwise... | |
201 jint index = _index; | |
202 jint next_index = index+1; | |
203 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
204 if (res == index) { | |
205 _base[index] = ptr; | |
206 // Note that we don't maintain this atomically. We could, but it | |
207 // doesn't seem necessary. | |
208 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
209 return; | |
210 } | |
211 // Otherwise, we need to try again. | |
212 } | |
213 } | |
214 | |
215 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
216 while (true) { | |
217 if (isFull()) { | |
218 _overflow = true; | |
219 return; | |
220 } | |
221 // Otherwise... | |
222 jint index = _index; | |
223 jint next_index = index + n; | |
224 if (next_index > _capacity) { | |
225 _overflow = true; | |
226 return; | |
227 } | |
228 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
229 if (res == index) { | |
230 for (int i = 0; i < n; i++) { | |
231 int ind = index + i; | |
232 assert(ind < _capacity, "By overflow test above."); | |
233 _base[ind] = ptr_arr[i]; | |
234 } | |
235 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
236 return; | |
237 } | |
238 // Otherwise, we need to try again. | |
239 } | |
240 } | |
241 | |
242 | |
243 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
244 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
245 jint start = _index; | |
246 jint next_index = start + n; | |
247 if (next_index > _capacity) { | |
248 _overflow = true; | |
249 return; | |
250 } | |
251 // Otherwise. | |
252 _index = next_index; | |
253 for (int i = 0; i < n; i++) { | |
254 int ind = start + i; | |
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255 assert(ind < _capacity, "By overflow test above."); |
342 | 256 _base[ind] = ptr_arr[i]; |
257 } | |
258 } | |
259 | |
260 | |
261 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
262 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
263 jint index = _index; | |
264 if (index == 0) { | |
265 *n = 0; | |
266 return false; | |
267 } else { | |
268 int k = MIN2(max, index); | |
269 jint new_ind = index - k; | |
270 for (int j = 0; j < k; j++) { | |
271 ptr_arr[j] = _base[new_ind + j]; | |
272 } | |
273 _index = new_ind; | |
274 *n = k; | |
275 return true; | |
276 } | |
277 } | |
278 | |
279 | |
280 CMRegionStack::CMRegionStack() : _base(NULL) {} | |
281 | |
282 void CMRegionStack::allocate(size_t size) { | |
283 _base = NEW_C_HEAP_ARRAY(MemRegion, size); | |
284 if (_base == NULL) | |
285 vm_exit_during_initialization("Failed to allocate " | |
286 "CM region mark stack"); | |
287 _index = 0; | |
288 // QQQQ cast ... | |
289 _capacity = (jint) size; | |
290 } | |
291 | |
292 CMRegionStack::~CMRegionStack() { | |
293 if (_base != NULL) FREE_C_HEAP_ARRAY(oop, _base); | |
294 } | |
295 | |
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296 void CMRegionStack::push_lock_free(MemRegion mr) { |
342 | 297 assert(mr.word_size() > 0, "Precondition"); |
298 while (true) { | |
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299 jint index = _index; |
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300 |
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301 if (index >= _capacity) { |
342 | 302 _overflow = true; |
303 return; | |
304 } | |
305 // Otherwise... | |
306 jint next_index = index+1; | |
307 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
308 if (res == index) { | |
309 _base[index] = mr; | |
310 return; | |
311 } | |
312 // Otherwise, we need to try again. | |
313 } | |
314 } | |
315 | |
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316 // Lock-free pop of the region stack. Called during the concurrent |
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317 // marking / remark phases. Should only be called in tandem with |
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318 // other lock-free pops. |
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319 MemRegion CMRegionStack::pop_lock_free() { |
342 | 320 while (true) { |
321 jint index = _index; | |
322 | |
323 if (index == 0) { | |
324 return MemRegion(); | |
325 } | |
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326 // Otherwise... |
342 | 327 jint next_index = index-1; |
328 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
329 if (res == index) { | |
330 MemRegion mr = _base[next_index]; | |
331 if (mr.start() != NULL) { | |
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332 assert(mr.end() != NULL, "invariant"); |
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333 assert(mr.word_size() > 0, "invariant"); |
342 | 334 return mr; |
335 } else { | |
336 // that entry was invalidated... let's skip it | |
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337 assert(mr.end() == NULL, "invariant"); |
342 | 338 } |
339 } | |
340 // Otherwise, we need to try again. | |
341 } | |
342 } | |
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343 |
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344 #if 0 |
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345 // The routines that manipulate the region stack with a lock are |
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346 // not currently used. They should be retained, however, as a |
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347 // diagnostic aid. |
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348 |
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349 void CMRegionStack::push_with_lock(MemRegion mr) { |
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350 assert(mr.word_size() > 0, "Precondition"); |
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351 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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352 |
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353 if (isFull()) { |
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354 _overflow = true; |
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355 return; |
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356 } |
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357 |
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358 _base[_index] = mr; |
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359 _index += 1; |
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360 } |
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361 |
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362 MemRegion CMRegionStack::pop_with_lock() { |
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363 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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364 |
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365 while (true) { |
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366 if (_index == 0) { |
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367 return MemRegion(); |
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368 } |
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369 _index -= 1; |
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370 |
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371 MemRegion mr = _base[_index]; |
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372 if (mr.start() != NULL) { |
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373 assert(mr.end() != NULL, "invariant"); |
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374 assert(mr.word_size() > 0, "invariant"); |
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375 return mr; |
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376 } else { |
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377 // that entry was invalidated... let's skip it |
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378 assert(mr.end() == NULL, "invariant"); |
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379 } |
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380 } |
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381 } |
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382 #endif |
342 | 383 |
384 bool CMRegionStack::invalidate_entries_into_cset() { | |
385 bool result = false; | |
386 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
387 for (int i = 0; i < _oops_do_bound; ++i) { | |
388 MemRegion mr = _base[i]; | |
389 if (mr.start() != NULL) { | |
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390 assert(mr.end() != NULL, "invariant"); |
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391 assert(mr.word_size() > 0, "invariant"); |
342 | 392 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
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393 assert(hr != NULL, "invariant"); |
342 | 394 if (hr->in_collection_set()) { |
395 // The region points into the collection set | |
396 _base[i] = MemRegion(); | |
397 result = true; | |
398 } | |
399 } else { | |
400 // that entry was invalidated... let's skip it | |
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401 assert(mr.end() == NULL, "invariant"); |
342 | 402 } |
403 } | |
404 return result; | |
405 } | |
406 | |
407 template<class OopClosureClass> | |
408 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
409 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
410 || SafepointSynchronize::is_at_safepoint(), | |
411 "Drain recursion must be yield-safe."); | |
412 bool res = true; | |
413 debug_only(_drain_in_progress = true); | |
414 debug_only(_drain_in_progress_yields = yield_after); | |
415 while (!isEmpty()) { | |
416 oop newOop = pop(); | |
417 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
418 assert(newOop->is_oop(), "Expected an oop"); | |
419 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
420 "only grey objects on this stack"); | |
421 // iterate over the oops in this oop, marking and pushing | |
422 // the ones in CMS generation. | |
423 newOop->oop_iterate(cl); | |
424 if (yield_after && _cm->do_yield_check()) { | |
425 res = false; break; | |
426 } | |
427 } | |
428 debug_only(_drain_in_progress = false); | |
429 return res; | |
430 } | |
431 | |
432 void CMMarkStack::oops_do(OopClosure* f) { | |
433 if (_index == 0) return; | |
434 assert(_oops_do_bound != -1 && _oops_do_bound <= _index, | |
435 "Bound must be set."); | |
436 for (int i = 0; i < _oops_do_bound; i++) { | |
437 f->do_oop(&_base[i]); | |
438 } | |
439 _oops_do_bound = -1; | |
440 } | |
441 | |
442 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
443 return (_g1h->is_obj_ill(obj) | |
444 || (_g1h->is_in_permanent(obj) | |
445 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
446 } | |
447 | |
448 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
449 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
450 #endif // _MSC_VER | |
451 | |
452 ConcurrentMark::ConcurrentMark(ReservedSpace rs, | |
453 int max_regions) : | |
454 _markBitMap1(rs, MinObjAlignment - 1), | |
455 _markBitMap2(rs, MinObjAlignment - 1), | |
456 | |
457 _parallel_marking_threads(0), | |
458 _sleep_factor(0.0), | |
459 _marking_task_overhead(1.0), | |
460 _cleanup_sleep_factor(0.0), | |
461 _cleanup_task_overhead(1.0), | |
2152 | 462 _cleanup_list("Cleanup List"), |
342 | 463 _region_bm(max_regions, false /* in_resource_area*/), |
464 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
465 CardTableModRefBS::card_shift, | |
466 false /* in_resource_area*/), | |
467 _prevMarkBitMap(&_markBitMap1), | |
468 _nextMarkBitMap(&_markBitMap2), | |
469 _at_least_one_mark_complete(false), | |
470 | |
471 _markStack(this), | |
472 _regionStack(), | |
473 // _finger set in set_non_marking_state | |
474 | |
475 _max_task_num(MAX2(ParallelGCThreads, (size_t)1)), | |
476 // _active_tasks set in set_non_marking_state | |
477 // _tasks set inside the constructor | |
478 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
479 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
480 | |
481 _has_overflown(false), | |
482 _concurrent(false), | |
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483 _has_aborted(false), |
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484 _restart_for_overflow(false), |
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485 _concurrent_marking_in_progress(false), |
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486 _should_gray_objects(false), |
342 | 487 |
488 // _verbose_level set below | |
489 | |
490 _init_times(), | |
491 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
492 _cleanup_times(), | |
493 _total_counting_time(0.0), | |
494 _total_rs_scrub_time(0.0), | |
495 | |
936 | 496 _parallel_workers(NULL) |
342 | 497 { |
498 CMVerboseLevel verbose_level = | |
499 (CMVerboseLevel) G1MarkingVerboseLevel; | |
500 if (verbose_level < no_verbose) | |
501 verbose_level = no_verbose; | |
502 if (verbose_level > high_verbose) | |
503 verbose_level = high_verbose; | |
504 _verbose_level = verbose_level; | |
505 | |
506 if (verbose_low()) | |
507 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " | |
508 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
509 | |
1284 | 510 _markStack.allocate(MarkStackSize); |
751 | 511 _regionStack.allocate(G1MarkRegionStackSize); |
342 | 512 |
513 // Create & start a ConcurrentMark thread. | |
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514 _cmThread = new ConcurrentMarkThread(this); |
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515 assert(cmThread() != NULL, "CM Thread should have been created"); |
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516 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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517 |
342 | 518 _g1h = G1CollectedHeap::heap(); |
519 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
520 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
521 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
522 | |
523 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 524 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 525 |
526 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
527 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
528 | |
529 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail | |
530 _active_tasks = _max_task_num; | |
531 for (int i = 0; i < (int) _max_task_num; ++i) { | |
532 CMTaskQueue* task_queue = new CMTaskQueue(); | |
533 task_queue->initialize(); | |
534 _task_queues->register_queue(i, task_queue); | |
535 | |
536 _tasks[i] = new CMTask(i, this, task_queue, _task_queues); | |
537 _accum_task_vtime[i] = 0.0; | |
538 } | |
539 | |
1284 | 540 if (ConcGCThreads > ParallelGCThreads) { |
541 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
342 | 542 "than ParallelGCThreads."); |
543 } | |
544 if (ParallelGCThreads == 0) { | |
545 // if we are not running with any parallel GC threads we will not | |
546 // spawn any marking threads either | |
547 _parallel_marking_threads = 0; | |
548 _sleep_factor = 0.0; | |
549 _marking_task_overhead = 1.0; | |
550 } else { | |
1284 | 551 if (ConcGCThreads > 0) { |
552 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
342 | 553 // if both are set |
554 | |
1284 | 555 _parallel_marking_threads = ConcGCThreads; |
342 | 556 _sleep_factor = 0.0; |
557 _marking_task_overhead = 1.0; | |
751 | 558 } else if (G1MarkingOverheadPercent > 0) { |
342 | 559 // we will calculate the number of parallel marking threads |
560 // based on a target overhead with respect to the soft real-time | |
561 // goal | |
562 | |
751 | 563 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 564 double overall_cm_overhead = |
751 | 565 (double) MaxGCPauseMillis * marking_overhead / |
566 (double) GCPauseIntervalMillis; | |
342 | 567 double cpu_ratio = 1.0 / (double) os::processor_count(); |
568 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
569 double marking_task_overhead = | |
570 overall_cm_overhead / marking_thread_num * | |
571 (double) os::processor_count(); | |
572 double sleep_factor = | |
573 (1.0 - marking_task_overhead) / marking_task_overhead; | |
574 | |
575 _parallel_marking_threads = (size_t) marking_thread_num; | |
576 _sleep_factor = sleep_factor; | |
577 _marking_task_overhead = marking_task_overhead; | |
578 } else { | |
579 _parallel_marking_threads = MAX2((ParallelGCThreads + 2) / 4, (size_t)1); | |
580 _sleep_factor = 0.0; | |
581 _marking_task_overhead = 1.0; | |
582 } | |
583 | |
584 if (parallel_marking_threads() > 1) | |
585 _cleanup_task_overhead = 1.0; | |
586 else | |
587 _cleanup_task_overhead = marking_task_overhead(); | |
588 _cleanup_sleep_factor = | |
589 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
590 | |
591 #if 0 | |
592 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
593 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
594 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
595 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
596 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
597 #endif | |
598 | |
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599 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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600 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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601 (int) _parallel_marking_threads, false, true); |
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602 if (_parallel_workers == NULL) { |
342 | 603 vm_exit_during_initialization("Failed necessary allocation."); |
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604 } else { |
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605 _parallel_workers->initialize_workers(); |
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606 } |
342 | 607 } |
608 | |
609 // so that the call below can read a sensible value | |
610 _heap_start = (HeapWord*) rs.base(); | |
611 set_non_marking_state(); | |
612 } | |
613 | |
614 void ConcurrentMark::update_g1_committed(bool force) { | |
615 // If concurrent marking is not in progress, then we do not need to | |
616 // update _heap_end. This has a subtle and important | |
617 // side-effect. Imagine that two evacuation pauses happen between | |
618 // marking completion and remark. The first one can grow the | |
619 // heap (hence now the finger is below the heap end). Then, the | |
620 // second one could unnecessarily push regions on the region | |
621 // stack. This causes the invariant that the region stack is empty | |
622 // at the beginning of remark to be false. By ensuring that we do | |
623 // not observe heap expansions after marking is complete, then we do | |
624 // not have this problem. | |
625 if (!concurrent_marking_in_progress() && !force) | |
626 return; | |
627 | |
628 MemRegion committed = _g1h->g1_committed(); | |
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629 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 630 HeapWord* new_end = committed.end(); |
631 if (new_end > _heap_end) { | |
632 // The heap has been expanded. | |
633 | |
634 _heap_end = new_end; | |
635 } | |
636 // Notice that the heap can also shrink. However, this only happens | |
637 // during a Full GC (at least currently) and the entire marking | |
638 // phase will bail out and the task will not be restarted. So, let's | |
639 // do nothing. | |
640 } | |
641 | |
642 void ConcurrentMark::reset() { | |
643 // Starting values for these two. This should be called in a STW | |
644 // phase. CM will be notified of any future g1_committed expansions | |
645 // will be at the end of evacuation pauses, when tasks are | |
646 // inactive. | |
647 MemRegion committed = _g1h->g1_committed(); | |
648 _heap_start = committed.start(); | |
649 _heap_end = committed.end(); | |
650 | |
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651 // Separated the asserts so that we know which one fires. |
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652 assert(_heap_start != NULL, "heap bounds should look ok"); |
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653 assert(_heap_end != NULL, "heap bounds should look ok"); |
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654 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 655 |
656 // reset all the marking data structures and any necessary flags | |
657 clear_marking_state(); | |
658 | |
659 if (verbose_low()) | |
660 gclog_or_tty->print_cr("[global] resetting"); | |
661 | |
662 // We do reset all of them, since different phases will use | |
663 // different number of active threads. So, it's easiest to have all | |
664 // of them ready. | |
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665 for (int i = 0; i < (int) _max_task_num; ++i) { |
342 | 666 _tasks[i]->reset(_nextMarkBitMap); |
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667 } |
342 | 668 |
669 // we need this to make sure that the flag is on during the evac | |
670 // pause with initial mark piggy-backed | |
671 set_concurrent_marking_in_progress(); | |
672 } | |
673 | |
674 void ConcurrentMark::set_phase(size_t active_tasks, bool concurrent) { | |
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675 assert(active_tasks <= _max_task_num, "we should not have more"); |
342 | 676 |
677 _active_tasks = active_tasks; | |
678 // Need to update the three data structures below according to the | |
679 // number of active threads for this phase. | |
680 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
681 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
682 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
683 | |
684 _concurrent = concurrent; | |
685 // We propagate this to all tasks, not just the active ones. | |
686 for (int i = 0; i < (int) _max_task_num; ++i) | |
687 _tasks[i]->set_concurrent(concurrent); | |
688 | |
689 if (concurrent) { | |
690 set_concurrent_marking_in_progress(); | |
691 } else { | |
692 // We currently assume that the concurrent flag has been set to | |
693 // false before we start remark. At this point we should also be | |
694 // in a STW phase. | |
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695 assert(!concurrent_marking_in_progress(), "invariant"); |
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696 assert(_finger == _heap_end, "only way to get here"); |
342 | 697 update_g1_committed(true); |
698 } | |
699 } | |
700 | |
701 void ConcurrentMark::set_non_marking_state() { | |
702 // We set the global marking state to some default values when we're | |
703 // not doing marking. | |
704 clear_marking_state(); | |
705 _active_tasks = 0; | |
706 clear_concurrent_marking_in_progress(); | |
707 } | |
708 | |
709 ConcurrentMark::~ConcurrentMark() { | |
710 for (int i = 0; i < (int) _max_task_num; ++i) { | |
711 delete _task_queues->queue(i); | |
712 delete _tasks[i]; | |
713 } | |
714 delete _task_queues; | |
715 FREE_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
716 } | |
717 | |
718 // This closure is used to mark refs into the g1 generation | |
719 // from external roots in the CMS bit map. | |
720 // Called at the first checkpoint. | |
721 // | |
722 | |
723 void ConcurrentMark::clearNextBitmap() { | |
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724 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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725 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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726 |
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727 // Make sure that the concurrent mark thread looks to still be in |
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728 // the current cycle. |
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729 guarantee(cmThread()->during_cycle(), "invariant"); |
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730 |
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731 // We are finishing up the current cycle by clearing the next |
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732 // marking bitmap and getting it ready for the next cycle. During |
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733 // this time no other cycle can start. So, let's make sure that this |
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734 // is the case. |
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735 guarantee(!g1h->mark_in_progress(), "invariant"); |
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736 |
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737 // clear the mark bitmap (no grey objects to start with). |
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738 // We need to do this in chunks and offer to yield in between |
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739 // each chunk. |
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740 HeapWord* start = _nextMarkBitMap->startWord(); |
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741 HeapWord* end = _nextMarkBitMap->endWord(); |
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742 HeapWord* cur = start; |
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743 size_t chunkSize = M; |
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744 while (cur < end) { |
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745 HeapWord* next = cur + chunkSize; |
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746 if (next > end) |
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747 next = end; |
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748 MemRegion mr(cur,next); |
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749 _nextMarkBitMap->clearRange(mr); |
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750 cur = next; |
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751 do_yield_check(); |
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752 |
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753 // Repeat the asserts from above. We'll do them as asserts here to |
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754 // minimize their overhead on the product. However, we'll have |
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755 // them as guarantees at the beginning / end of the bitmap |
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756 // clearing to get some checking in the product. |
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757 assert(cmThread()->during_cycle(), "invariant"); |
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758 assert(!g1h->mark_in_progress(), "invariant"); |
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759 } |
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760 |
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761 // Repeat the asserts from above. |
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762 guarantee(cmThread()->during_cycle(), "invariant"); |
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763 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 764 } |
765 | |
766 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
767 public: | |
768 bool doHeapRegion(HeapRegion* r) { | |
769 if (!r->continuesHumongous()) { | |
770 r->note_start_of_marking(true); | |
771 } | |
772 return false; | |
773 } | |
774 }; | |
775 | |
776 void ConcurrentMark::checkpointRootsInitialPre() { | |
777 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
778 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
779 | |
780 _has_aborted = false; | |
781 | |
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782 #ifndef PRODUCT |
1044 | 783 if (G1PrintReachableAtInitialMark) { |
1388 | 784 print_reachable("at-cycle-start", |
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785 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 786 } |
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787 #endif |
342 | 788 |
789 // Initialise marking structures. This has to be done in a STW phase. | |
790 reset(); | |
791 } | |
792 | |
793 class CMMarkRootsClosure: public OopsInGenClosure { | |
794 private: | |
795 ConcurrentMark* _cm; | |
796 G1CollectedHeap* _g1h; | |
797 bool _do_barrier; | |
798 | |
799 public: | |
800 CMMarkRootsClosure(ConcurrentMark* cm, | |
801 G1CollectedHeap* g1h, | |
802 bool do_barrier) : _cm(cm), _g1h(g1h), | |
803 _do_barrier(do_barrier) { } | |
804 | |
845
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805 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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806 virtual void do_oop( oop* p) { do_oop_work(p); } |
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807 |
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808 template <class T> void do_oop_work(T* p) { |
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809 T heap_oop = oopDesc::load_heap_oop(p); |
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810 if (!oopDesc::is_null(heap_oop)) { |
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811 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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812 assert(obj->is_oop() || obj->mark() == NULL, |
342 | 813 "expected an oop, possibly with mark word displaced"); |
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814 HeapWord* addr = (HeapWord*)obj; |
342 | 815 if (_g1h->is_in_g1_reserved(addr)) { |
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816 _cm->grayRoot(obj); |
342 | 817 } |
818 } | |
819 if (_do_barrier) { | |
820 assert(!_g1h->is_in_g1_reserved(p), | |
821 "Should be called on external roots"); | |
822 do_barrier(p); | |
823 } | |
824 } | |
825 }; | |
826 | |
827 void ConcurrentMark::checkpointRootsInitialPost() { | |
828 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
829 | |
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830 // If we force an overflow during remark, the remark operation will |
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831 // actually abort and we'll restart concurrent marking. If we always |
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832 // force an oveflow during remark we'll never actually complete the |
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833 // marking phase. So, we initilize this here, at the start of the |
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834 // cycle, so that at the remaining overflow number will decrease at |
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835 // every remark and we'll eventually not need to cause one. |
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836 force_overflow_stw()->init(); |
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837 |
342 | 838 // For each region note start of marking. |
839 NoteStartOfMarkHRClosure startcl; | |
840 g1h->heap_region_iterate(&startcl); | |
841 | |
842 // Start weak-reference discovery. | |
843 ReferenceProcessor* rp = g1h->ref_processor(); | |
844 rp->verify_no_references_recorded(); | |
845 rp->enable_discovery(); // enable ("weak") refs discovery | |
457
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846 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 847 |
848 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
1317
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849 // This is the start of the marking cycle, we're expected all |
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850 // threads to have SATB queues with active set to false. |
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851 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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852 false /* expected_active */); |
342 | 853 |
854 // update_g1_committed() will be called at the end of an evac pause | |
855 // when marking is on. So, it's also called at the end of the | |
856 // initial-mark pause to update the heap end, if the heap expands | |
857 // during it. No need to call it here. | |
858 } | |
859 | |
860 // Checkpoint the roots into this generation from outside | |
861 // this generation. [Note this initial checkpoint need only | |
862 // be approximate -- we'll do a catch up phase subsequently.] | |
863 void ConcurrentMark::checkpointRootsInitial() { | |
864 assert(SafepointSynchronize::is_at_safepoint(), "world should be stopped"); | |
865 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
866 | |
867 double start = os::elapsedTime(); | |
868 | |
869 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); | |
870 g1p->record_concurrent_mark_init_start(); | |
871 checkpointRootsInitialPre(); | |
872 | |
873 // YSR: when concurrent precleaning is in place, we'll | |
874 // need to clear the cached card table here | |
875 | |
876 ResourceMark rm; | |
877 HandleMark hm; | |
878 | |
879 g1h->ensure_parsability(false); | |
880 g1h->perm_gen()->save_marks(); | |
881 | |
882 CMMarkRootsClosure notOlder(this, g1h, false); | |
883 CMMarkRootsClosure older(this, g1h, true); | |
884 | |
885 g1h->set_marking_started(); | |
886 g1h->rem_set()->prepare_for_younger_refs_iterate(false); | |
887 | |
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888 g1h->process_strong_roots(true, // activate StrongRootsScope |
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889 false, // fake perm gen collection |
342 | 890 SharedHeap::SO_AllClasses, |
891 ¬Older, // Regular roots | |
989
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892 NULL, // do not visit active blobs |
342 | 893 &older // Perm Gen Roots |
894 ); | |
895 checkpointRootsInitialPost(); | |
896 | |
897 // Statistics. | |
898 double end = os::elapsedTime(); | |
899 _init_times.add((end - start) * 1000.0); | |
900 | |
901 g1p->record_concurrent_mark_init_end(); | |
902 } | |
903 | |
904 /* | |
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905 * Notice that in the next two methods, we actually leave the STS |
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906 * during the barrier sync and join it immediately afterwards. If we |
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907 * do not do this, the following deadlock can occur: one thread could |
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908 * be in the barrier sync code, waiting for the other thread to also |
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909 * sync up, whereas another one could be trying to yield, while also |
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910 * waiting for the other threads to sync up too. |
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911 * |
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912 * Note, however, that this code is also used during remark and in |
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913 * this case we should not attempt to leave / enter the STS, otherwise |
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914 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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915 * (product). So we should only leave / enter the STS if we are |
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916 * operating concurrently. |
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917 * |
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918 * Because the thread that does the sync barrier has left the STS, it |
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919 * is possible to be suspended for a Full GC or an evacuation pause |
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920 * could occur. This is actually safe, since the entering the sync |
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921 * barrier is one of the last things do_marking_step() does, and it |
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922 * doesn't manipulate any data structures afterwards. |
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923 */ |
342 | 924 |
925 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
926 if (verbose_low()) | |
927 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); | |
928 | |
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929 if (concurrent()) { |
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930 ConcurrentGCThread::stsLeave(); |
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931 } |
342 | 932 _first_overflow_barrier_sync.enter(); |
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933 if (concurrent()) { |
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934 ConcurrentGCThread::stsJoin(); |
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935 } |
342 | 936 // at this point everyone should have synced up and not be doing any |
937 // more work | |
938 | |
939 if (verbose_low()) | |
940 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); | |
941 | |
942 // let task 0 do this | |
943 if (task_num == 0) { | |
944 // task 0 is responsible for clearing the global data structures | |
3316
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945 // We should be here because of an overflow. During STW we should |
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946 // not clear the overflow flag since we rely on it being true when |
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947 // we exit this method to abort the pause and restart concurent |
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948 // marking. |
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949 clear_marking_state(concurrent() /* clear_overflow */); |
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950 force_overflow()->update(); |
342 | 951 |
952 if (PrintGC) { | |
953 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
954 gclog_or_tty->stamp(PrintGCTimeStamps); | |
955 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
956 } | |
957 } | |
958 | |
959 // after this, each task should reset its own data structures then | |
960 // then go into the second barrier | |
961 } | |
962 | |
963 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
964 if (verbose_low()) | |
965 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); | |
966 | |
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967 if (concurrent()) { |
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968 ConcurrentGCThread::stsLeave(); |
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969 } |
342 | 970 _second_overflow_barrier_sync.enter(); |
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971 if (concurrent()) { |
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972 ConcurrentGCThread::stsJoin(); |
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973 } |
342 | 974 // at this point everything should be re-initialised and ready to go |
975 | |
976 if (verbose_low()) | |
977 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); | |
978 } | |
979 | |
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980 #ifndef PRODUCT |
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981 void ForceOverflowSettings::init() { |
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982 _num_remaining = G1ConcMarkForceOverflow; |
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983 _force = false; |
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984 update(); |
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985 } |
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986 |
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987 void ForceOverflowSettings::update() { |
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988 if (_num_remaining > 0) { |
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989 _num_remaining -= 1; |
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990 _force = true; |
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991 } else { |
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992 _force = false; |
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993 } |
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994 } |
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995 |
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996 bool ForceOverflowSettings::should_force() { |
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997 if (_force) { |
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998 _force = false; |
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999 return true; |
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1000 } else { |
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1001 return false; |
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1002 } |
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1003 } |
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1004 #endif // !PRODUCT |
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1005 |
342 | 1006 void ConcurrentMark::grayRoot(oop p) { |
1007 HeapWord* addr = (HeapWord*) p; | |
1008 // We can't really check against _heap_start and _heap_end, since it | |
1009 // is possible during an evacuation pause with piggy-backed | |
1010 // initial-mark that the committed space is expanded during the | |
1011 // pause without CM observing this change. So the assertions below | |
1012 // is a bit conservative; but better than nothing. | |
1023
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1013 assert(_g1h->g1_committed().contains(addr), |
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1014 "address should be within the heap bounds"); |
342 | 1015 |
1016 if (!_nextMarkBitMap->isMarked(addr)) | |
1017 _nextMarkBitMap->parMark(addr); | |
1018 } | |
1019 | |
1020 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { | |
1021 // The objects on the region have already been marked "in bulk" by | |
1022 // the caller. We only need to decide whether to push the region on | |
1023 // the region stack or not. | |
1024 | |
1025 if (!concurrent_marking_in_progress() || !_should_gray_objects) | |
1026 // We're done with marking and waiting for remark. We do not need to | |
1027 // push anything else on the region stack. | |
1028 return; | |
1029 | |
1030 HeapWord* finger = _finger; | |
1031 | |
1032 if (verbose_low()) | |
1033 gclog_or_tty->print_cr("[global] attempting to push " | |
1034 "region ["PTR_FORMAT", "PTR_FORMAT"), finger is at " | |
1035 PTR_FORMAT, mr.start(), mr.end(), finger); | |
1036 | |
1037 if (mr.start() < finger) { | |
1038 // The finger is always heap region aligned and it is not possible | |
1039 // for mr to span heap regions. | |
1023
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1040 assert(mr.end() <= finger, "invariant"); |
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1041 |
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1042 // Separated the asserts so that we know which one fires. |
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1043 assert(mr.start() <= mr.end(), |
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1044 "region boundaries should fall within the committed space"); |
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1045 assert(_heap_start <= mr.start(), |
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1046 "region boundaries should fall within the committed space"); |
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1047 assert(mr.end() <= _heap_end, |
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1048 "region boundaries should fall within the committed space"); |
342 | 1049 if (verbose_low()) |
1050 gclog_or_tty->print_cr("[global] region ["PTR_FORMAT", "PTR_FORMAT") " | |
1051 "below the finger, pushing it", | |
1052 mr.start(), mr.end()); | |
1053 | |
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1054 if (!region_stack_push_lock_free(mr)) { |
342 | 1055 if (verbose_low()) |
1056 gclog_or_tty->print_cr("[global] region stack has overflown."); | |
1057 } | |
1058 } | |
1059 } | |
1060 | |
1061 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
1062 // The object is not marked by the caller. We need to at least mark | |
1063 // it and maybe push in on the stack. | |
1064 | |
1065 HeapWord* addr = (HeapWord*)p; | |
1066 if (!_nextMarkBitMap->isMarked(addr)) { | |
1067 // We definitely need to mark it, irrespective whether we bail out | |
1068 // because we're done with marking. | |
1069 if (_nextMarkBitMap->parMark(addr)) { | |
1070 if (!concurrent_marking_in_progress() || !_should_gray_objects) | |
1071 // If we're done with concurrent marking and we're waiting for | |
1072 // remark, then we're not pushing anything on the stack. | |
1073 return; | |
1074 | |
1075 // No OrderAccess:store_load() is needed. It is implicit in the | |
1076 // CAS done in parMark(addr) above | |
1077 HeapWord* finger = _finger; | |
1078 | |
1079 if (addr < finger) { | |
1080 if (!mark_stack_push(oop(addr))) { | |
1081 if (verbose_low()) | |
1082 gclog_or_tty->print_cr("[global] global stack overflow " | |
1083 "during parMark"); | |
1084 } | |
1085 } | |
1086 } | |
1087 } | |
1088 } | |
1089 | |
1090 class CMConcurrentMarkingTask: public AbstractGangTask { | |
1091 private: | |
1092 ConcurrentMark* _cm; | |
1093 ConcurrentMarkThread* _cmt; | |
1094 | |
1095 public: | |
1096 void work(int worker_i) { | |
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1097 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1098 "this should only be done by a conc GC thread"); |
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1099 ResourceMark rm; |
342 | 1100 |
1101 double start_vtime = os::elapsedVTime(); | |
1102 | |
1103 ConcurrentGCThread::stsJoin(); | |
1104 | |
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1105 assert((size_t) worker_i < _cm->active_tasks(), "invariant"); |
342 | 1106 CMTask* the_task = _cm->task(worker_i); |
1107 the_task->record_start_time(); | |
1108 if (!_cm->has_aborted()) { | |
1109 do { | |
1110 double start_vtime_sec = os::elapsedVTime(); | |
1111 double start_time_sec = os::elapsedTime(); | |
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1112 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1113 |
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1114 the_task->do_marking_step(mark_step_duration_ms, |
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1115 true /* do_stealing */, |
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1116 true /* do_termination */); |
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1117 |
342 | 1118 double end_time_sec = os::elapsedTime(); |
1119 double end_vtime_sec = os::elapsedVTime(); | |
1120 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1121 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1122 _cm->clear_has_overflown(); | |
1123 | |
1124 bool ret = _cm->do_yield_check(worker_i); | |
1125 | |
1126 jlong sleep_time_ms; | |
1127 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1128 sleep_time_ms = | |
1129 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1130 ConcurrentGCThread::stsLeave(); | |
1131 os::sleep(Thread::current(), sleep_time_ms, false); | |
1132 ConcurrentGCThread::stsJoin(); | |
1133 } | |
1134 double end_time2_sec = os::elapsedTime(); | |
1135 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1136 | |
1137 #if 0 | |
1138 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1139 "overhead %1.4lf", | |
1140 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1141 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1142 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1143 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1144 #endif | |
1145 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1146 } | |
1147 the_task->record_end_time(); | |
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1148 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1149 |
1150 ConcurrentGCThread::stsLeave(); | |
1151 | |
1152 double end_vtime = os::elapsedVTime(); | |
1153 _cm->update_accum_task_vtime(worker_i, end_vtime - start_vtime); | |
1154 } | |
1155 | |
1156 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1157 ConcurrentMarkThread* cmt) : | |
1158 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1159 | |
1160 ~CMConcurrentMarkingTask() { } | |
1161 }; | |
1162 | |
1163 void ConcurrentMark::markFromRoots() { | |
1164 // we might be tempted to assert that: | |
1165 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1166 // "inconsistent argument?"); | |
1167 // However that wouldn't be right, because it's possible that | |
1168 // a safepoint is indeed in progress as a younger generation | |
1169 // stop-the-world GC happens even as we mark in this generation. | |
1170 | |
1171 _restart_for_overflow = false; | |
1172 | |
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1173 size_t active_workers = MAX2((size_t) 1, parallel_marking_threads()); |
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1174 force_overflow_conc()->init(); |
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1175 set_phase(active_workers, true /* concurrent */); |
342 | 1176 |
1177 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
1178 if (parallel_marking_threads() > 0) | |
1179 _parallel_workers->run_task(&markingTask); | |
1180 else | |
1181 markingTask.work(0); | |
1182 print_stats(); | |
1183 } | |
1184 | |
1185 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1186 // world is stopped at this checkpoint | |
1187 assert(SafepointSynchronize::is_at_safepoint(), | |
1188 "world should be stopped"); | |
1189 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1190 | |
1191 // If a full collection has happened, we shouldn't do this. | |
1192 if (has_aborted()) { | |
1193 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1194 return; | |
1195 } | |
1196 | |
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1197 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1198 |
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1199 if (VerifyDuringGC) { |
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1200 HandleMark hm; // handle scope |
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1201 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1202 Universe::heap()->prepare_for_verify(); |
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1203 Universe::verify(/* allow dirty */ true, |
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1204 /* silent */ false, |
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1205 /* option */ VerifyOption_G1UsePrevMarking); |
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1206 } |
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1207 |
342 | 1208 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1209 g1p->record_concurrent_mark_remark_start(); | |
1210 | |
1211 double start = os::elapsedTime(); | |
1212 | |
1213 checkpointRootsFinalWork(); | |
1214 | |
1215 double mark_work_end = os::elapsedTime(); | |
1216 | |
1217 weakRefsWork(clear_all_soft_refs); | |
1218 | |
1219 if (has_overflown()) { | |
1220 // Oops. We overflowed. Restart concurrent marking. | |
1221 _restart_for_overflow = true; | |
1222 // Clear the flag. We do not need it any more. | |
1223 clear_has_overflown(); | |
1224 if (G1TraceMarkStackOverflow) | |
1225 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); | |
1226 } else { | |
2149 | 1227 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1228 // We're done with marking. |
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1229 // This is the end of the marking cycle, we're expected all |
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1230 // threads to have SATB queues with active set to true. |
2149 | 1231 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1232 true /* expected_active */); | |
811 | 1233 |
1234 if (VerifyDuringGC) { | |
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1235 HandleMark hm; // handle scope |
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1236 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1237 Universe::heap()->prepare_for_verify(); |
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1238 Universe::verify(/* allow dirty */ true, |
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1239 /* silent */ false, |
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1240 /* option */ VerifyOption_G1UseNextMarking); |
811 | 1241 } |
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1242 assert(!restart_for_overflow(), "sanity"); |
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1243 } |
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1244 |
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1245 // Reset the marking state if marking completed |
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1246 if (!restart_for_overflow()) { |
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1247 set_non_marking_state(); |
342 | 1248 } |
1249 | |
1250 #if VERIFY_OBJS_PROCESSED | |
1251 _scan_obj_cl.objs_processed = 0; | |
1252 ThreadLocalObjQueue::objs_enqueued = 0; | |
1253 #endif | |
1254 | |
1255 // Statistics | |
1256 double now = os::elapsedTime(); | |
1257 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1258 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1259 _remark_times.add((now - start) * 1000.0); | |
1260 | |
1261 g1p->record_concurrent_mark_remark_end(); | |
1262 } | |
1263 | |
1264 #define CARD_BM_TEST_MODE 0 | |
1265 | |
1266 class CalcLiveObjectsClosure: public HeapRegionClosure { | |
1267 | |
1268 CMBitMapRO* _bm; | |
1269 ConcurrentMark* _cm; | |
1270 bool _changed; | |
1271 bool _yield; | |
1272 size_t _words_done; | |
1273 size_t _tot_live; | |
1274 size_t _tot_used; | |
1275 size_t _regions_done; | |
1276 double _start_vtime_sec; | |
1277 | |
1278 BitMap* _region_bm; | |
1279 BitMap* _card_bm; | |
1280 intptr_t _bottom_card_num; | |
1281 bool _final; | |
1282 | |
1283 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
1284 for (intptr_t i = start_card_num; i <= last_card_num; i++) { | |
1285 #if CARD_BM_TEST_MODE | |
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1286 guarantee(_card_bm->at(i - _bottom_card_num), "Should already be set."); |
342 | 1287 #else |
1288 _card_bm->par_at_put(i - _bottom_card_num, 1); | |
1289 #endif | |
1290 } | |
1291 } | |
1292 | |
1293 public: | |
1294 CalcLiveObjectsClosure(bool final, | |
1295 CMBitMapRO *bm, ConcurrentMark *cm, | |
936 | 1296 BitMap* region_bm, BitMap* card_bm) : |
342 | 1297 _bm(bm), _cm(cm), _changed(false), _yield(true), |
1298 _words_done(0), _tot_live(0), _tot_used(0), | |
936 | 1299 _region_bm(region_bm), _card_bm(card_bm),_final(final), |
342 | 1300 _regions_done(0), _start_vtime_sec(0.0) |
1301 { | |
1302 _bottom_card_num = | |
1303 intptr_t(uintptr_t(G1CollectedHeap::heap()->reserved_region().start()) >> | |
1304 CardTableModRefBS::card_shift); | |
1305 } | |
1306 | |
829 | 1307 // It takes a region that's not empty (i.e., it has at least one |
1308 // live object in it and sets its corresponding bit on the region | |
1309 // bitmap to 1. If the region is "starts humongous" it will also set | |
1310 // to 1 the bits on the region bitmap that correspond to its | |
1311 // associated "continues humongous" regions. | |
1312 void set_bit_for_region(HeapRegion* hr) { | |
1313 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1314 | |
1315 size_t index = hr->hrs_index(); | |
1316 if (!hr->startsHumongous()) { | |
1317 // Normal (non-humongous) case: just set the bit. | |
1318 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
1319 } else { | |
1320 // Starts humongous case: calculate how many regions are part of | |
1321 // this humongous region and then set the bit range. It might | |
1322 // have been a bit more efficient to look at the object that | |
1323 // spans these humongous regions to calculate their number from | |
1324 // the object's size. However, it's a good idea to calculate | |
1325 // this based on the metadata itself, and not the region | |
1326 // contents, so that this code is not aware of what goes into | |
1327 // the humongous regions (in case this changes in the future). | |
1328 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1329 size_t end_index = index + 1; | |
831 | 1330 while (end_index < g1h->n_regions()) { |
1331 HeapRegion* chr = g1h->region_at(end_index); | |
829 | 1332 if (!chr->continuesHumongous()) { |
1333 break; | |
1334 } | |
1335 end_index += 1; | |
1336 } | |
1337 _region_bm->par_at_put_range((BitMap::idx_t) index, | |
1338 (BitMap::idx_t) end_index, true); | |
1339 } | |
1340 } | |
1341 | |
342 | 1342 bool doHeapRegion(HeapRegion* hr) { |
1343 if (!_final && _regions_done == 0) | |
1344 _start_vtime_sec = os::elapsedVTime(); | |
1345 | |
639 | 1346 if (hr->continuesHumongous()) { |
829 | 1347 // We will ignore these here and process them when their |
1348 // associated "starts humongous" region is processed (see | |
1349 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1350 // associated "starts humongous" region to have their bit set to | |
1351 // 1 since, due to the region chunking in the parallel region | |
1352 // iteration, a "continues humongous" region might be visited | |
1353 // before its associated "starts humongous". | |
639 | 1354 return false; |
1355 } | |
342 | 1356 |
1357 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
1358 HeapWord* start = hr->top_at_conc_mark_count(); | |
1359 assert(hr->bottom() <= start && start <= hr->end() && | |
1360 hr->bottom() <= nextTop && nextTop <= hr->end() && | |
1361 start <= nextTop, | |
1362 "Preconditions."); | |
1363 // Otherwise, record the number of word's we'll examine. | |
1364 size_t words_done = (nextTop - start); | |
1365 // Find the first marked object at or after "start". | |
1366 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
1367 size_t marked_bytes = 0; | |
1368 | |
1369 // Below, the term "card num" means the result of shifting an address | |
1370 // by the card shift -- address 0 corresponds to card number 0. One | |
1371 // must subtract the card num of the bottom of the heap to obtain a | |
1372 // card table index. | |
1373 // The first card num of the sequence of live cards currently being | |
1374 // constructed. -1 ==> no sequence. | |
1375 intptr_t start_card_num = -1; | |
1376 // The last card num of the sequence of live cards currently being | |
1377 // constructed. -1 ==> no sequence. | |
1378 intptr_t last_card_num = -1; | |
1379 | |
1380 while (start < nextTop) { | |
1381 if (_yield && _cm->do_yield_check()) { | |
1382 // We yielded. It might be for a full collection, in which case | |
1383 // all bets are off; terminate the traversal. | |
1384 if (_cm->has_aborted()) { | |
1385 _changed = false; | |
1386 return true; | |
1387 } else { | |
1388 // Otherwise, it might be a collection pause, and the region | |
1389 // we're looking at might be in the collection set. We'll | |
1390 // abandon this region. | |
1391 return false; | |
1392 } | |
1393 } | |
1394 oop obj = oop(start); | |
1395 int obj_sz = obj->size(); | |
1396 // The card num of the start of the current object. | |
1397 intptr_t obj_card_num = | |
1398 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
1399 | |
1400 HeapWord* obj_last = start + obj_sz - 1; | |
1401 intptr_t obj_last_card_num = | |
1402 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
1403 | |
1404 if (obj_card_num != last_card_num) { | |
1405 if (start_card_num == -1) { | |
1406 assert(last_card_num == -1, "Both or neither."); | |
1407 start_card_num = obj_card_num; | |
1408 } else { | |
1409 assert(last_card_num != -1, "Both or neither."); | |
1410 assert(obj_card_num >= last_card_num, "Inv"); | |
1411 if ((obj_card_num - last_card_num) > 1) { | |
1412 // Mark the last run, and start a new one. | |
1413 mark_card_num_range(start_card_num, last_card_num); | |
1414 start_card_num = obj_card_num; | |
1415 } | |
1416 } | |
1417 #if CARD_BM_TEST_MODE | |
1418 /* | |
1419 gclog_or_tty->print_cr("Setting bits from %d/%d.", | |
1420 obj_card_num - _bottom_card_num, | |
1421 obj_last_card_num - _bottom_card_num); | |
1422 */ | |
1423 for (intptr_t j = obj_card_num; j <= obj_last_card_num; j++) { | |
1424 _card_bm->par_at_put(j - _bottom_card_num, 1); | |
1425 } | |
1426 #endif | |
1427 } | |
1428 // In any case, we set the last card num. | |
1429 last_card_num = obj_last_card_num; | |
1430 | |
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1431 marked_bytes += (size_t)obj_sz * HeapWordSize; |
342 | 1432 // Find the next marked object after this one. |
1433 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
1434 _changed = true; | |
1435 } | |
1436 // Handle the last range, if any. | |
1437 if (start_card_num != -1) | |
1438 mark_card_num_range(start_card_num, last_card_num); | |
1439 if (_final) { | |
1440 // Mark the allocated-since-marking portion... | |
1441 HeapWord* tp = hr->top(); | |
1442 if (nextTop < tp) { | |
1443 start_card_num = | |
1444 intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); | |
1445 last_card_num = | |
1446 intptr_t(uintptr_t(tp) >> CardTableModRefBS::card_shift); | |
1447 mark_card_num_range(start_card_num, last_card_num); | |
1448 // This definitely means the region has live objects. | |
829 | 1449 set_bit_for_region(hr); |
342 | 1450 } |
1451 } | |
1452 | |
1453 hr->add_to_marked_bytes(marked_bytes); | |
1454 // Update the live region bitmap. | |
1455 if (marked_bytes > 0) { | |
829 | 1456 set_bit_for_region(hr); |
342 | 1457 } |
1458 hr->set_top_at_conc_mark_count(nextTop); | |
1459 _tot_live += hr->next_live_bytes(); | |
1460 _tot_used += hr->used(); | |
1461 _words_done = words_done; | |
1462 | |
1463 if (!_final) { | |
1464 ++_regions_done; | |
1465 if (_regions_done % 10 == 0) { | |
1466 double end_vtime_sec = os::elapsedVTime(); | |
1467 double elapsed_vtime_sec = end_vtime_sec - _start_vtime_sec; | |
1468 if (elapsed_vtime_sec > (10.0 / 1000.0)) { | |
1469 jlong sleep_time_ms = | |
1470 (jlong) (elapsed_vtime_sec * _cm->cleanup_sleep_factor() * 1000.0); | |
1471 os::sleep(Thread::current(), sleep_time_ms, false); | |
1472 _start_vtime_sec = end_vtime_sec; | |
1473 } | |
1474 } | |
1475 } | |
1476 | |
1477 return false; | |
1478 } | |
1479 | |
1480 bool changed() { return _changed; } | |
1481 void reset() { _changed = false; _words_done = 0; } | |
1482 void no_yield() { _yield = false; } | |
1483 size_t words_done() { return _words_done; } | |
1484 size_t tot_live() { return _tot_live; } | |
1485 size_t tot_used() { return _tot_used; } | |
1486 }; | |
1487 | |
1488 | |
1489 void ConcurrentMark::calcDesiredRegions() { | |
1490 _region_bm.clear(); | |
1491 _card_bm.clear(); | |
1492 CalcLiveObjectsClosure calccl(false /*final*/, | |
1493 nextMarkBitMap(), this, | |
936 | 1494 &_region_bm, &_card_bm); |
342 | 1495 G1CollectedHeap *g1h = G1CollectedHeap::heap(); |
1496 g1h->heap_region_iterate(&calccl); | |
1497 | |
1498 do { | |
1499 calccl.reset(); | |
1500 g1h->heap_region_iterate(&calccl); | |
1501 } while (calccl.changed()); | |
1502 } | |
1503 | |
1504 class G1ParFinalCountTask: public AbstractGangTask { | |
1505 protected: | |
1506 G1CollectedHeap* _g1h; | |
1507 CMBitMap* _bm; | |
1508 size_t _n_workers; | |
1509 size_t *_live_bytes; | |
1510 size_t *_used_bytes; | |
1511 BitMap* _region_bm; | |
1512 BitMap* _card_bm; | |
1513 public: | |
1514 G1ParFinalCountTask(G1CollectedHeap* g1h, CMBitMap* bm, | |
1515 BitMap* region_bm, BitMap* card_bm) : | |
1516 AbstractGangTask("G1 final counting"), _g1h(g1h), | |
1517 _bm(bm), _region_bm(region_bm), _card_bm(card_bm) | |
1518 { | |
1519 if (ParallelGCThreads > 0) | |
1520 _n_workers = _g1h->workers()->total_workers(); | |
1521 else | |
1522 _n_workers = 1; | |
1523 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
1524 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
1525 } | |
1526 | |
1527 ~G1ParFinalCountTask() { | |
1528 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
1529 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
1530 } | |
1531 | |
1532 void work(int i) { | |
1533 CalcLiveObjectsClosure calccl(true /*final*/, | |
1534 _bm, _g1h->concurrent_mark(), | |
936 | 1535 _region_bm, _card_bm); |
342 | 1536 calccl.no_yield(); |
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1537 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1538 _g1h->heap_region_par_iterate_chunked(&calccl, i, |
1539 HeapRegion::FinalCountClaimValue); | |
342 | 1540 } else { |
1541 _g1h->heap_region_iterate(&calccl); | |
1542 } | |
1543 assert(calccl.complete(), "Shouldn't have yielded!"); | |
1544 | |
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1545 assert((size_t) i < _n_workers, "invariant"); |
342 | 1546 _live_bytes[i] = calccl.tot_live(); |
1547 _used_bytes[i] = calccl.tot_used(); | |
1548 } | |
1549 size_t live_bytes() { | |
1550 size_t live_bytes = 0; | |
1551 for (size_t i = 0; i < _n_workers; ++i) | |
1552 live_bytes += _live_bytes[i]; | |
1553 return live_bytes; | |
1554 } | |
1555 size_t used_bytes() { | |
1556 size_t used_bytes = 0; | |
1557 for (size_t i = 0; i < _n_workers; ++i) | |
1558 used_bytes += _used_bytes[i]; | |
1559 return used_bytes; | |
1560 } | |
1561 }; | |
1562 | |
1563 class G1ParNoteEndTask; | |
1564 | |
1565 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1566 G1CollectedHeap* _g1; | |
1567 int _worker_num; | |
1568 size_t _max_live_bytes; | |
1569 size_t _regions_claimed; | |
1570 size_t _freed_bytes; | |
2173 | 1571 FreeRegionList* _local_cleanup_list; |
1572 HumongousRegionSet* _humongous_proxy_set; | |
1573 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1574 double _claimed_region_time; |
1575 double _max_region_time; | |
1576 | |
1577 public: | |
1578 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1579 int worker_num, |
1580 FreeRegionList* local_cleanup_list, | |
1581 HumongousRegionSet* humongous_proxy_set, | |
1582 HRRSCleanupTask* hrrs_cleanup_task); | |
342 | 1583 size_t freed_bytes() { return _freed_bytes; } |
1584 | |
1585 bool doHeapRegion(HeapRegion *r); | |
1586 | |
1587 size_t max_live_bytes() { return _max_live_bytes; } | |
1588 size_t regions_claimed() { return _regions_claimed; } | |
1589 double claimed_region_time_sec() { return _claimed_region_time; } | |
1590 double max_region_time_sec() { return _max_region_time; } | |
1591 }; | |
1592 | |
1593 class G1ParNoteEndTask: public AbstractGangTask { | |
1594 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1595 |
342 | 1596 protected: |
1597 G1CollectedHeap* _g1h; | |
1598 size_t _max_live_bytes; | |
1599 size_t _freed_bytes; | |
2152 | 1600 FreeRegionList* _cleanup_list; |
1601 | |
342 | 1602 public: |
1603 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1604 FreeRegionList* cleanup_list) : |
342 | 1605 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1606 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1607 |
1608 void work(int i) { | |
1609 double start = os::elapsedTime(); | |
2173 | 1610 FreeRegionList local_cleanup_list("Local Cleanup List"); |
1611 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); | |
1612 HRRSCleanupTask hrrs_cleanup_task; | |
1613 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, i, &local_cleanup_list, | |
1614 &humongous_proxy_set, | |
1615 &hrrs_cleanup_task); | |
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1616 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1617 _g1h->heap_region_par_iterate_chunked(&g1_note_end, i, |
1618 HeapRegion::NoteEndClaimValue); | |
342 | 1619 } else { |
1620 _g1h->heap_region_iterate(&g1_note_end); | |
1621 } | |
1622 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1623 | |
2152 | 1624 // Now update the lists |
1625 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1626 NULL /* free_list */, | |
2173 | 1627 &humongous_proxy_set, |
2152 | 1628 true /* par */); |
342 | 1629 { |
1630 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1631 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1632 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1633 |
2173 | 1634 _cleanup_list->add_as_tail(&local_cleanup_list); |
1635 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1636 | |
1637 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1638 } |
1639 double end = os::elapsedTime(); | |
1640 if (G1PrintParCleanupStats) { | |
1641 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
1642 "claimed %d regions (tot = %8.3f ms, max = %8.3f ms).\n", | |
1643 i, start, end, (end-start)*1000.0, | |
1644 g1_note_end.regions_claimed(), | |
1645 g1_note_end.claimed_region_time_sec()*1000.0, | |
1646 g1_note_end.max_region_time_sec()*1000.0); | |
1647 } | |
1648 } | |
1649 size_t max_live_bytes() { return _max_live_bytes; } | |
1650 size_t freed_bytes() { return _freed_bytes; } | |
1651 }; | |
1652 | |
1653 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1654 protected: | |
1655 G1RemSet* _g1rs; | |
1656 BitMap* _region_bm; | |
1657 BitMap* _card_bm; | |
1658 public: | |
1659 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1660 BitMap* region_bm, BitMap* card_bm) : | |
1661 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
1662 _region_bm(region_bm), _card_bm(card_bm) | |
1663 {} | |
1664 | |
1665 void work(int i) { | |
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1666 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1667 _g1rs->scrub_par(_region_bm, _card_bm, i, |
1668 HeapRegion::ScrubRemSetClaimValue); | |
342 | 1669 } else { |
1670 _g1rs->scrub(_region_bm, _card_bm); | |
1671 } | |
1672 } | |
1673 | |
1674 }; | |
1675 | |
1676 G1NoteEndOfConcMarkClosure:: | |
1677 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1678 int worker_num, |
1679 FreeRegionList* local_cleanup_list, | |
1680 HumongousRegionSet* humongous_proxy_set, | |
1681 HRRSCleanupTask* hrrs_cleanup_task) | |
342 | 1682 : _g1(g1), _worker_num(worker_num), |
1683 _max_live_bytes(0), _regions_claimed(0), | |
2152 | 1684 _freed_bytes(0), |
342 | 1685 _claimed_region_time(0.0), _max_region_time(0.0), |
2173 | 1686 _local_cleanup_list(local_cleanup_list), |
1687 _humongous_proxy_set(humongous_proxy_set), | |
1688 _hrrs_cleanup_task(hrrs_cleanup_task) { } | |
2152 | 1689 |
1690 bool G1NoteEndOfConcMarkClosure::doHeapRegion(HeapRegion *hr) { | |
342 | 1691 // We use a claim value of zero here because all regions |
1692 // were claimed with value 1 in the FinalCount task. | |
2152 | 1693 hr->reset_gc_time_stamp(); |
1694 if (!hr->continuesHumongous()) { | |
342 | 1695 double start = os::elapsedTime(); |
1696 _regions_claimed++; | |
2152 | 1697 hr->note_end_of_marking(); |
1698 _max_live_bytes += hr->max_live_bytes(); | |
2173 | 1699 _g1->free_region_if_empty(hr, |
1700 &_freed_bytes, | |
1701 _local_cleanup_list, | |
1702 _humongous_proxy_set, | |
1703 _hrrs_cleanup_task, | |
1704 true /* par */); | |
342 | 1705 double region_time = (os::elapsedTime() - start); |
1706 _claimed_region_time += region_time; | |
1707 if (region_time > _max_region_time) _max_region_time = region_time; | |
1708 } | |
1709 return false; | |
1710 } | |
1711 | |
1712 void ConcurrentMark::cleanup() { | |
1713 // world is stopped at this checkpoint | |
1714 assert(SafepointSynchronize::is_at_safepoint(), | |
1715 "world should be stopped"); | |
1716 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1717 | |
1718 // If a full collection has happened, we shouldn't do this. | |
1719 if (has_aborted()) { | |
1720 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1721 return; | |
1722 } | |
1723 | |
2152 | 1724 g1h->verify_region_sets_optional(); |
1725 | |
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1726 if (VerifyDuringGC) { |
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1727 HandleMark hm; // handle scope |
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1728 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1729 Universe::heap()->prepare_for_verify(); |
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1730 Universe::verify(/* allow dirty */ true, |
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1731 /* silent */ false, |
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1732 /* option */ VerifyOption_G1UsePrevMarking); |
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1733 } |
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1734 |
342 | 1735 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1736 g1p->record_concurrent_mark_cleanup_start(); | |
1737 | |
1738 double start = os::elapsedTime(); | |
1739 | |
2173 | 1740 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1741 | |
342 | 1742 // Do counting once more with the world stopped for good measure. |
1743 G1ParFinalCountTask g1_par_count_task(g1h, nextMarkBitMap(), | |
1744 &_region_bm, &_card_bm); | |
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1745 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1746 assert(g1h->check_heap_region_claim_values( |
1747 HeapRegion::InitialClaimValue), | |
1748 "sanity check"); | |
1749 | |
342 | 1750 int n_workers = g1h->workers()->total_workers(); |
1751 g1h->set_par_threads(n_workers); | |
1752 g1h->workers()->run_task(&g1_par_count_task); | |
1753 g1h->set_par_threads(0); | |
355 | 1754 |
1755 assert(g1h->check_heap_region_claim_values( | |
1756 HeapRegion::FinalCountClaimValue), | |
1757 "sanity check"); | |
342 | 1758 } else { |
1759 g1_par_count_task.work(0); | |
1760 } | |
1761 | |
1762 size_t known_garbage_bytes = | |
1763 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
1764 #if 0 | |
1765 gclog_or_tty->print_cr("used %1.2lf, live %1.2lf, garbage %1.2lf", | |
1766 (double) g1_par_count_task.used_bytes() / (double) (1024 * 1024), | |
1767 (double) g1_par_count_task.live_bytes() / (double) (1024 * 1024), | |
1768 (double) known_garbage_bytes / (double) (1024 * 1024)); | |
1769 #endif // 0 | |
1770 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
1771 | |
1772 size_t start_used_bytes = g1h->used(); | |
1773 _at_least_one_mark_complete = true; | |
1774 g1h->set_marking_complete(); | |
1775 | |
1776 double count_end = os::elapsedTime(); | |
1777 double this_final_counting_time = (count_end - start); | |
1778 if (G1PrintParCleanupStats) { | |
1779 gclog_or_tty->print_cr("Cleanup:"); | |
1780 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
1781 this_final_counting_time*1000.0); | |
1782 } | |
1783 _total_counting_time += this_final_counting_time; | |
1784 | |
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1785 if (G1PrintRegionLivenessInfo) { |
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1786 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1787 _g1h->heap_region_iterate(&cl); |
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1788 } |
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1789 |
342 | 1790 // Install newly created mark bitMap as "prev". |
1791 swapMarkBitMaps(); | |
1792 | |
1793 g1h->reset_gc_time_stamp(); | |
1794 | |
1795 // Note end of marking in all heap regions. | |
1796 double note_end_start = os::elapsedTime(); | |
2152 | 1797 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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1798 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1799 int n_workers = g1h->workers()->total_workers(); |
1800 g1h->set_par_threads(n_workers); | |
1801 g1h->workers()->run_task(&g1_par_note_end_task); | |
1802 g1h->set_par_threads(0); | |
355 | 1803 |
1804 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
1805 "sanity check"); | |
342 | 1806 } else { |
1807 g1_par_note_end_task.work(0); | |
1808 } | |
2152 | 1809 |
1810 if (!cleanup_list_is_empty()) { | |
1811 // The cleanup list is not empty, so we'll have to process it | |
1812 // concurrently. Notify anyone else that might be wanting free | |
1813 // regions that there will be more free regions coming soon. | |
1814 g1h->set_free_regions_coming(); | |
1815 } | |
342 | 1816 double note_end_end = os::elapsedTime(); |
1817 if (G1PrintParCleanupStats) { | |
1818 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
1819 (note_end_end - note_end_start)*1000.0); | |
1820 } | |
1821 | |
355 | 1822 |
342 | 1823 // call below, since it affects the metric by which we sort the heap |
1824 // regions. | |
1825 if (G1ScrubRemSets) { | |
1826 double rs_scrub_start = os::elapsedTime(); | |
1827 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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1828 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1829 int n_workers = g1h->workers()->total_workers(); |
1830 g1h->set_par_threads(n_workers); | |
1831 g1h->workers()->run_task(&g1_par_scrub_rs_task); | |
1832 g1h->set_par_threads(0); | |
355 | 1833 |
1834 assert(g1h->check_heap_region_claim_values( | |
1835 HeapRegion::ScrubRemSetClaimValue), | |
1836 "sanity check"); | |
342 | 1837 } else { |
1838 g1_par_scrub_rs_task.work(0); | |
1839 } | |
1840 | |
1841 double rs_scrub_end = os::elapsedTime(); | |
1842 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
1843 _total_rs_scrub_time += this_rs_scrub_time; | |
1844 } | |
1845 | |
1846 // this will also free any regions totally full of garbage objects, | |
1847 // and sort the regions. | |
1848 g1h->g1_policy()->record_concurrent_mark_cleanup_end( | |
1849 g1_par_note_end_task.freed_bytes(), | |
1850 g1_par_note_end_task.max_live_bytes()); | |
1851 | |
1852 // Statistics. | |
1853 double end = os::elapsedTime(); | |
1854 _cleanup_times.add((end - start) * 1000.0); | |
1855 | |
1856 // G1CollectedHeap::heap()->print(); | |
1857 // gclog_or_tty->print_cr("HEAP GC TIME STAMP : %d", | |
1858 // G1CollectedHeap::heap()->get_gc_time_stamp()); | |
1859 | |
1860 if (PrintGC || PrintGCDetails) { | |
1861 g1h->print_size_transition(gclog_or_tty, | |
1862 start_used_bytes, | |
1863 g1h->used(), | |
1864 g1h->capacity()); | |
1865 } | |
1866 | |
1867 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
1868 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
1869 | |
1870 // We need to make this be a "collection" so any collection pause that | |
1871 // races with it goes around and waits for completeCleanup to finish. | |
1872 g1h->increment_total_collections(); | |
1873 | |
751 | 1874 if (VerifyDuringGC) { |
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1875 HandleMark hm; // handle scope |
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1876 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1877 Universe::heap()->prepare_for_verify(); |
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1878 Universe::verify(/* allow dirty */ true, |
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1879 /* silent */ false, |
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1880 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 1881 } |
2152 | 1882 |
1883 g1h->verify_region_sets_optional(); | |
342 | 1884 } |
1885 | |
1886 void ConcurrentMark::completeCleanup() { | |
1887 if (has_aborted()) return; | |
1888 | |
2152 | 1889 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1890 | |
1891 _cleanup_list.verify_optional(); | |
2361 | 1892 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 1893 |
1894 if (G1ConcRegionFreeingVerbose) { | |
1895 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
1896 "cleanup list has "SIZE_FORMAT" entries", | |
1897 _cleanup_list.length()); | |
1898 } | |
1899 | |
1900 // Noone else should be accessing the _cleanup_list at this point, | |
1901 // so it's not necessary to take any locks | |
1902 while (!_cleanup_list.is_empty()) { | |
1903 HeapRegion* hr = _cleanup_list.remove_head(); | |
1904 assert(hr != NULL, "the list was not empty"); | |
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1905 hr->par_clear(); |
2361 | 1906 tmp_free_list.add_as_tail(hr); |
2152 | 1907 |
1908 // Instead of adding one region at a time to the secondary_free_list, | |
1909 // we accumulate them in the local list and move them a few at a | |
1910 // time. This also cuts down on the number of notify_all() calls | |
1911 // we do during this process. We'll also append the local list when | |
1912 // _cleanup_list is empty (which means we just removed the last | |
1913 // region from the _cleanup_list). | |
2361 | 1914 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 1915 _cleanup_list.is_empty()) { |
1916 if (G1ConcRegionFreeingVerbose) { | |
1917 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
1918 "appending "SIZE_FORMAT" entries to the " | |
1919 "secondary_free_list, clean list still has " | |
1920 SIZE_FORMAT" entries", | |
2361 | 1921 tmp_free_list.length(), |
2152 | 1922 _cleanup_list.length()); |
342 | 1923 } |
2152 | 1924 |
1925 { | |
1926 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 1927 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 1928 SecondaryFreeList_lock->notify_all(); |
1929 } | |
1930 | |
1931 if (G1StressConcRegionFreeing) { | |
1932 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
1933 os::sleep(Thread::current(), (jlong) 1, false); | |
1934 } | |
1935 } | |
342 | 1936 } |
1937 } | |
2361 | 1938 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 1939 } |
1940 | |
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1941 // Support closures for reference procssing in G1 |
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1942 |
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1943 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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1944 HeapWord* addr = (HeapWord*)obj; |
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1945 return addr != NULL && |
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1946 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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1947 } |
342 | 1948 |
1949 class G1CMKeepAliveClosure: public OopClosure { | |
1950 G1CollectedHeap* _g1; | |
1951 ConcurrentMark* _cm; | |
1952 CMBitMap* _bitMap; | |
1953 public: | |
1954 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm, | |
1955 CMBitMap* bitMap) : | |
1956 _g1(g1), _cm(cm), | |
1957 _bitMap(bitMap) {} | |
1958 | |
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1959 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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1960 virtual void do_oop( oop* p) { do_oop_work(p); } |
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1961 |
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1962 template <class T> void do_oop_work(T* p) { |
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1963 oop obj = oopDesc::load_decode_heap_oop(p); |
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1964 HeapWord* addr = (HeapWord*)obj; |
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1965 |
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1966 if (_cm->verbose_high()) |
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1967 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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1968 "*"PTR_FORMAT" = "PTR_FORMAT, |
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1969 p, (void*) obj); |
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1970 |
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1971 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
342 | 1972 _bitMap->mark(addr); |
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1973 _cm->mark_stack_push(obj); |
342 | 1974 } |
1975 } | |
1976 }; | |
1977 | |
1978 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
1979 CMMarkStack* _markStack; | |
1980 CMBitMap* _bitMap; | |
1981 G1CMKeepAliveClosure* _oopClosure; | |
1982 public: | |
1983 G1CMDrainMarkingStackClosure(CMBitMap* bitMap, CMMarkStack* markStack, | |
1984 G1CMKeepAliveClosure* oopClosure) : | |
1985 _bitMap(bitMap), | |
1986 _markStack(markStack), | |
1987 _oopClosure(oopClosure) | |
1988 {} | |
1989 | |
1990 void do_void() { | |
1991 _markStack->drain((OopClosure*)_oopClosure, _bitMap, false); | |
1992 } | |
1993 }; | |
1994 | |
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1995 // 'Keep Alive' closure used by parallel reference processing. |
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1996 // An instance of this closure is used in the parallel reference processing |
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1997 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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1998 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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1999 // placed on to discovered ref lists once so we can mark and push with no |
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2000 // need to check whether the object has already been marked. Using the |
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2001 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2002 // operating on the global mark stack. This means that an individual |
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2003 // worker would be doing lock-free pushes while it processes its own |
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2004 // discovered ref list followed by drain call. If the discovered ref lists |
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2005 // are unbalanced then this could cause interference with the other |
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2006 // workers. Using a CMTask (and its embedded local data structures) |
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2007 // avoids that potential interference. |
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2008 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2009 ConcurrentMark* _cm; |
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2010 CMTask* _task; |
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2011 CMBitMap* _bitMap; |
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2012 int _ref_counter_limit; |
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2013 int _ref_counter; |
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2014 public: |
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2015 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, |
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2016 CMTask* task, |
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2017 CMBitMap* bitMap) : |
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2018 _cm(cm), _task(task), _bitMap(bitMap), |
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2019 _ref_counter_limit(G1RefProcDrainInterval) |
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2020 { |
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2021 assert(_ref_counter_limit > 0, "sanity"); |
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2022 _ref_counter = _ref_counter_limit; |
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2023 } |
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2024 |
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2025 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2026 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2027 |
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2028 template <class T> void do_oop_work(T* p) { |
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2029 if (!_cm->has_overflown()) { |
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2030 oop obj = oopDesc::load_decode_heap_oop(p); |
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2031 if (_cm->verbose_high()) |
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2032 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2033 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2034 _task->task_id(), p, (void*) obj); |
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2035 |
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2036 _task->deal_with_reference(obj); |
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2037 _ref_counter--; |
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2038 |
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2039 if (_ref_counter == 0) { |
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2040 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2041 // reachable from them on to the local stack (and possibly the global stack). |
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2042 // Call do_marking_step() to process these entries. We call the routine in a |
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2043 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2044 // with the entries that we've pushed as a result of the deal_with_reference |
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2045 // calls above) or we overflow. |
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2046 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2047 // while there may still be some work to do. (See the comment at the |
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2048 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2049 // is reaching the specified time target.) It is only when |
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2050 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2051 // that the marking has completed. |
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2052 do { |
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2053 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2054 _task->do_marking_step(mark_step_duration_ms, |
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2055 false /* do_stealing */, |
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2056 false /* do_termination */); |
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2057 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2058 _ref_counter = _ref_counter_limit; |
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2059 } |
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2060 } else { |
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2061 if (_cm->verbose_high()) |
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2062 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
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2063 } |
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2064 } |
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2065 }; |
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2066 |
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2067 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
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2068 ConcurrentMark* _cm; |
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2069 CMTask* _task; |
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2070 public: |
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2071 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
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2072 _cm(cm), _task(task) |
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2073 {} |
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2074 |
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2075 void do_void() { |
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2076 do { |
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2077 if (_cm->verbose_high()) |
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2078 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", _task->task_id()); |
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2079 |
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2080 // We call CMTask::do_marking_step() to completely drain the local and |
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2081 // global marking stacks. The routine is called in a loop, which we'll |
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2082 // exit if there's nothing more to do (i.e. we'completely drained the |
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2083 // entries that were pushed as a result of applying the |
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2084 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
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2085 // lists above) or we overflow the global marking stack. |
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2086 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2087 // while there may still be some work to do. (See the comment at the |
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2088 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2089 // is reaching the specified time target.) It is only when |
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2090 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2091 // that the marking has completed. |
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2092 |
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2093 _task->do_marking_step(1000000000.0 /* something very large */, |
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2094 true /* do_stealing */, |
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2095 true /* do_termination */); |
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2096 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2097 } |
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2098 }; |
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2099 |
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2100 // Implementation of AbstractRefProcTaskExecutor for G1 |
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2101 class G1RefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2102 private: |
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2103 G1CollectedHeap* _g1h; |
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2104 ConcurrentMark* _cm; |
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2105 CMBitMap* _bitmap; |
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2106 WorkGang* _workers; |
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2107 int _active_workers; |
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2108 |
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2109 public: |
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2110 G1RefProcTaskExecutor(G1CollectedHeap* g1h, |
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2111 ConcurrentMark* cm, |
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2112 CMBitMap* bitmap, |
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2113 WorkGang* workers, |
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2114 int n_workers) : |
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2115 _g1h(g1h), _cm(cm), _bitmap(bitmap), |
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2116 _workers(workers), _active_workers(n_workers) |
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2117 { } |
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2118 |
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2119 // Executes the given task using concurrent marking worker threads. |
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2120 virtual void execute(ProcessTask& task); |
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2121 virtual void execute(EnqueueTask& task); |
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2122 }; |
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2123 |
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2124 class G1RefProcTaskProxy: public AbstractGangTask { |
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2125 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2126 ProcessTask& _proc_task; |
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2127 G1CollectedHeap* _g1h; |
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2128 ConcurrentMark* _cm; |
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2129 CMBitMap* _bitmap; |
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2130 |
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2131 public: |
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2132 G1RefProcTaskProxy(ProcessTask& proc_task, |
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2133 G1CollectedHeap* g1h, |
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2134 ConcurrentMark* cm, |
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2135 CMBitMap* bitmap) : |
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2136 AbstractGangTask("Process reference objects in parallel"), |
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2137 _proc_task(proc_task), _g1h(g1h), _cm(cm), _bitmap(bitmap) |
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2138 {} |
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2139 |
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2140 virtual void work(int i) { |
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2141 CMTask* marking_task = _cm->task(i); |
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2142 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2143 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task, _bitmap); |
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2144 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2145 |
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2146 _proc_task.work(i, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2147 } |
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2148 }; |
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2149 |
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2150 void G1RefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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2151 assert(_workers != NULL, "Need parallel worker threads."); |
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2152 |
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2153 G1RefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm, _bitmap); |
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2154 |
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2155 // We need to reset the phase for each task execution so that |
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2156 // the termination protocol of CMTask::do_marking_step works. |
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2157 _cm->set_phase(_active_workers, false /* concurrent */); |
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2158 _g1h->set_par_threads(_active_workers); |
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2159 _workers->run_task(&proc_task_proxy); |
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2160 _g1h->set_par_threads(0); |
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2161 } |
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2162 |
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2163 class G1RefEnqueueTaskProxy: public AbstractGangTask { |
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2164 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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2165 EnqueueTask& _enq_task; |
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2166 |
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2167 public: |
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2168 G1RefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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2169 AbstractGangTask("Enqueue reference objects in parallel"), |
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2170 _enq_task(enq_task) |
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2171 { } |
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2172 |
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2173 virtual void work(int i) { |
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2174 _enq_task.work(i); |
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2175 } |
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2176 }; |
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2177 |
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2178 void G1RefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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2179 assert(_workers != NULL, "Need parallel worker threads."); |
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2180 |
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2181 G1RefEnqueueTaskProxy enq_task_proxy(enq_task); |
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2182 |
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2183 _g1h->set_par_threads(_active_workers); |
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2184 _workers->run_task(&enq_task_proxy); |
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2185 _g1h->set_par_threads(0); |
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2186 } |
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2187 |
342 | 2188 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
2189 ResourceMark rm; | |
2190 HandleMark hm; | |
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2191 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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2192 ReferenceProcessor* rp = g1h->ref_processor(); |
342 | 2193 |
1974
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2194 // See the comment in G1CollectedHeap::ref_processing_init() |
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2195 // about how reference processing currently works in G1. |
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2196 |
342 | 2197 // Process weak references. |
457
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2198 rp->setup_policy(clear_all_soft_refs); |
342 | 2199 assert(_markStack.isEmpty(), "mark stack should be empty"); |
2200 | |
2037
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2201 G1CMIsAliveClosure g1_is_alive(g1h); |
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2202 G1CMKeepAliveClosure g1_keep_alive(g1h, this, nextMarkBitMap()); |
342 | 2203 G1CMDrainMarkingStackClosure |
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2204 g1_drain_mark_stack(nextMarkBitMap(), &_markStack, &g1_keep_alive); |
2174
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2205 // We use the work gang from the G1CollectedHeap and we utilize all |
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2206 // the worker threads. |
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2207 int active_workers = g1h->workers() ? g1h->workers()->total_workers() : 1; |
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2208 active_workers = MAX2(MIN2(active_workers, (int)_max_task_num), 1); |
2174
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2209 |
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2210 G1RefProcTaskExecutor par_task_executor(g1h, this, nextMarkBitMap(), |
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2211 g1h->workers(), active_workers); |
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2212 |
2369
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2213 |
2174
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2214 if (rp->processing_is_mt()) { |
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2215 // Set the degree of MT here. If the discovery is done MT, there |
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2216 // may have been a different number of threads doing the discovery |
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2217 // and a different number of discovered lists may have Ref objects. |
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2218 // That is OK as long as the Reference lists are balanced (see |
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2219 // balance_all_queues() and balance_queues()). |
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2220 rp->set_active_mt_degree(active_workers); |
2174
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2221 |
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2222 rp->process_discovered_references(&g1_is_alive, |
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2223 &g1_keep_alive, |
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2224 &g1_drain_mark_stack, |
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|
2225 &par_task_executor); |
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2226 |
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2227 // The work routines of the parallel keep_alive and drain_marking_stack |
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2228 // will set the has_overflown flag if we overflow the global marking |
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|
2229 // stack. |
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2230 } else { |
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2231 rp->process_discovered_references(&g1_is_alive, |
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2232 &g1_keep_alive, |
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2233 &g1_drain_mark_stack, |
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|
2234 NULL); |
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|
2235 |
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|
2236 } |
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|
2237 |
342 | 2238 assert(_markStack.overflow() || _markStack.isEmpty(), |
2174
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2239 "mark stack should be empty (unless it overflowed)"); |
342 | 2240 if (_markStack.overflow()) { |
2174
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2241 // Should have been done already when we tried to push an |
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2242 // entry on to the global mark stack. But let's do it again. |
342 | 2243 set_has_overflown(); |
2244 } | |
2245 | |
2174
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2246 if (rp->processing_is_mt()) { |
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2247 assert(rp->num_q() == active_workers, "why not"); |
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2248 rp->enqueue_discovered_references(&par_task_executor); |
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2249 } else { |
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|
2250 rp->enqueue_discovered_references(); |
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|
2251 } |
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|
2252 |
342 | 2253 rp->verify_no_references_recorded(); |
2254 assert(!rp->discovery_enabled(), "should have been disabled"); | |
2255 | |
2177
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|
2256 // Now clean up stale oops in StringTable |
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|
2257 StringTable::unlink(&g1_is_alive); |
2177
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2258 // Clean up unreferenced symbols in symbol table. |
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|
2259 SymbolTable::unlink(); |
342 | 2260 } |
2261 | |
2262 void ConcurrentMark::swapMarkBitMaps() { | |
2263 CMBitMapRO* temp = _prevMarkBitMap; | |
2264 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2265 _nextMarkBitMap = (CMBitMap*) temp; | |
2266 } | |
2267 | |
2268 class CMRemarkTask: public AbstractGangTask { | |
2269 private: | |
2270 ConcurrentMark *_cm; | |
2271 | |
2272 public: | |
2273 void work(int worker_i) { | |
2274 // Since all available tasks are actually started, we should | |
2275 // only proceed if we're supposed to be actived. | |
2276 if ((size_t)worker_i < _cm->active_tasks()) { | |
2277 CMTask* task = _cm->task(worker_i); | |
2278 task->record_start_time(); | |
2279 do { | |
2174
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2280 task->do_marking_step(1000000000.0 /* something very large */, |
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2281 true /* do_stealing */, |
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|
2282 true /* do_termination */); |
342 | 2283 } while (task->has_aborted() && !_cm->has_overflown()); |
2284 // If we overflow, then we do not want to restart. We instead | |
2285 // want to abort remark and do concurrent marking again. | |
2286 task->record_end_time(); | |
2287 } | |
2288 } | |
2289 | |
2290 CMRemarkTask(ConcurrentMark* cm) : | |
2291 AbstractGangTask("Par Remark"), _cm(cm) { } | |
2292 }; | |
2293 | |
2294 void ConcurrentMark::checkpointRootsFinalWork() { | |
2295 ResourceMark rm; | |
2296 HandleMark hm; | |
2297 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2298 | |
2299 g1h->ensure_parsability(false); | |
2300 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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1719
diff
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|
2301 if (G1CollectedHeap::use_parallel_gc_threads()) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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912
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|
2302 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2303 // this is remark, so we'll use up all available threads |
2304 int active_workers = ParallelGCThreads; | |
2174
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2305 set_phase(active_workers, false /* concurrent */); |
342 | 2306 |
2307 CMRemarkTask remarkTask(this); | |
2308 // We will start all available threads, even if we decide that the | |
2309 // active_workers will be fewer. The extra ones will just bail out | |
2310 // immediately. | |
2311 int n_workers = g1h->workers()->total_workers(); | |
2312 g1h->set_par_threads(n_workers); | |
2313 g1h->workers()->run_task(&remarkTask); | |
2314 g1h->set_par_threads(0); | |
2315 } else { | |
989
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912
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changeset
|
2316 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2317 // this is remark, so we'll use up all available threads |
2318 int active_workers = 1; | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2319 set_phase(active_workers, false /* concurrent */); |
342 | 2320 |
2321 CMRemarkTask remarkTask(this); | |
2322 // We will start all available threads, even if we decide that the | |
2323 // active_workers will be fewer. The extra ones will just bail out | |
2324 // immediately. | |
2325 remarkTask.work(0); | |
2326 } | |
1023
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6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
2327 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
2328 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2329 |
2330 print_stats(); | |
2331 | |
2332 #if VERIFY_OBJS_PROCESSED | |
2333 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
2334 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
2335 _scan_obj_cl.objs_processed, | |
2336 ThreadLocalObjQueue::objs_enqueued); | |
2337 guarantee(_scan_obj_cl.objs_processed == | |
2338 ThreadLocalObjQueue::objs_enqueued, | |
2339 "Different number of objs processed and enqueued."); | |
2340 } | |
2341 #endif | |
2342 } | |
2343 | |
1044 | 2344 #ifndef PRODUCT |
2345 | |
1388 | 2346 class PrintReachableOopClosure: public OopClosure { |
342 | 2347 private: |
2348 G1CollectedHeap* _g1h; | |
2349 outputStream* _out; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
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|
2350 VerifyOption _vo; |
1388 | 2351 bool _all; |
342 | 2352 |
2353 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2354 PrintReachableOopClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2355 VerifyOption vo, |
1388 | 2356 bool all) : |
1044 | 2357 _g1h(G1CollectedHeap::heap()), |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2358 _out(out), _vo(vo), _all(all) { } |
342 | 2359 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
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|
2360 void do_oop(narrowOop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
831
diff
changeset
|
2361 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
changeset
|
2362 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
changeset
|
2363 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:
831
diff
changeset
|
2364 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2365 const char* str = NULL; |
2366 const char* str2 = ""; | |
2367 | |
1388 | 2368 if (obj == NULL) { |
2369 str = ""; | |
2370 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2371 str = " O"; | |
2372 } else { | |
342 | 2373 HeapRegion* hr = _g1h->heap_region_containing(obj); |
1023
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1022
diff
changeset
|
2374 guarantee(hr != NULL, "invariant"); |
1044 | 2375 bool over_tams = false; |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2376 bool marked = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2377 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3771
diff
changeset
|
2378 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2379 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
2380 over_tams = hr->obj_allocated_since_prev_marking(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2381 marked = _g1h->isMarkedPrev(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2382 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2383 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
2384 over_tams = hr->obj_allocated_since_next_marking(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2385 marked = _g1h->isMarkedNext(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2386 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2387 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2388 marked = obj->is_gc_marked(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2389 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2390 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
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diff
changeset
|
2391 ShouldNotReachHere(); |
1044 | 2392 } |
2393 | |
2394 if (over_tams) { | |
1388 | 2395 str = " >"; |
2396 if (marked) { | |
342 | 2397 str2 = " AND MARKED"; |
1044 | 2398 } |
1388 | 2399 } else if (marked) { |
2400 str = " M"; | |
1044 | 2401 } else { |
1388 | 2402 str = " NOT"; |
1044 | 2403 } |
342 | 2404 } |
2405 | |
1388 | 2406 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2407 p, (void*) obj, str, str2); |
2408 } | |
2409 }; | |
2410 | |
1388 | 2411 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2412 private: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2413 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2414 outputStream* _out; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2415 VerifyOption _vo; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2416 bool _all; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2417 HeapRegion* _hr; |
342 | 2418 |
2419 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2420 PrintReachableObjectClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2421 VerifyOption vo, |
1388 | 2422 bool all, |
2423 HeapRegion* hr) : | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2424 _g1h(G1CollectedHeap::heap()), |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2425 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2426 |
2427 void do_object(oop o) { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2428 bool over_tams = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2429 bool marked = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2430 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2431 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2432 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2433 over_tams = _hr->obj_allocated_since_prev_marking(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2434 marked = _g1h->isMarkedPrev(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2435 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2436 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2437 over_tams = _hr->obj_allocated_since_next_marking(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2438 marked = _g1h->isMarkedNext(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2439 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2440 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2441 marked = o->is_gc_marked(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2442 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2443 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2444 ShouldNotReachHere(); |
1388 | 2445 } |
2446 bool print_it = _all || over_tams || marked; | |
2447 | |
2448 if (print_it) { | |
2449 _out->print_cr(" "PTR_FORMAT"%s", | |
2450 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2451 PrintReachableOopClosure oopCl(_out, _vo, _all); |
1388 | 2452 o->oop_iterate(&oopCl); |
2453 } | |
342 | 2454 } |
2455 }; | |
2456 | |
1388 | 2457 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2458 private: |
2459 outputStream* _out; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2460 VerifyOption _vo; |
1388 | 2461 bool _all; |
342 | 2462 |
2463 public: | |
2464 bool doHeapRegion(HeapRegion* hr) { | |
2465 HeapWord* b = hr->bottom(); | |
2466 HeapWord* e = hr->end(); | |
2467 HeapWord* t = hr->top(); | |
1044 | 2468 HeapWord* p = NULL; |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2469 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2470 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2471 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2472 p = hr->prev_top_at_mark_start(); |
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 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2475 p = hr->next_top_at_mark_start(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2476 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2477 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2478 // When we are verifying marking using the mark word |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2479 // TAMS has no relevance. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2480 assert(p == NULL, "post-condition"); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2481 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2482 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2483 ShouldNotReachHere(); |
1044 | 2484 } |
342 | 2485 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2486 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2487 _out->cr(); |
2488 | |
2489 HeapWord* from = b; | |
2490 HeapWord* to = t; | |
2491 | |
2492 if (to > from) { | |
2493 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2494 _out->cr(); | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2495 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2496 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2497 _out->cr(); | |
2498 } | |
342 | 2499 |
2500 return false; | |
2501 } | |
2502 | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2503 PrintReachableRegionClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2504 VerifyOption vo, |
1388 | 2505 bool all) : |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2506 _out(out), _vo(vo), _all(all) { } |
342 | 2507 }; |
2508 | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2509 static const char* verify_option_to_tams(VerifyOption vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2510 switch (vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2511 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2512 return "PTAMS"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2513 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2514 return "NTAMS"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2515 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2516 return "NONE"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2517 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2518 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2519 |
1388 | 2520 void ConcurrentMark::print_reachable(const char* str, |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2521 VerifyOption vo, |
1388 | 2522 bool all) { |
2523 gclog_or_tty->cr(); | |
2524 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2525 |
2526 if (G1PrintReachableBaseFile == NULL) { | |
2527 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2528 return; | |
2529 } | |
2530 | |
2531 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2532 (JVM_MAXPATHLEN - 1)) { | |
2533 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2534 return; | |
2535 } | |
2536 | |
2537 char file_name[JVM_MAXPATHLEN]; | |
2538 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2539 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2540 | |
2541 fileStream fout(file_name); | |
2542 if (!fout.is_open()) { | |
2543 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2544 return; | |
2545 } | |
2546 | |
2547 outputStream* out = &fout; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2548 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
1044 | 2549 out->cr(); |
2550 | |
1388 | 2551 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2552 out->cr(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2553 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2554 _g1h->heap_region_iterate(&rcl); |
1044 | 2555 out->cr(); |
2556 | |
2557 gclog_or_tty->print_cr(" done"); | |
1388 | 2558 gclog_or_tty->flush(); |
342 | 2559 } |
2560 | |
1044 | 2561 #endif // PRODUCT |
2562 | |
342 | 2563 // This note is for drainAllSATBBuffers and the code in between. |
2564 // In the future we could reuse a task to do this work during an | |
2565 // evacuation pause (since now tasks are not active and can be claimed | |
2566 // during an evacuation pause). This was a late change to the code and | |
2567 // is currently not being taken advantage of. | |
2568 | |
2569 class CMGlobalObjectClosure : public ObjectClosure { | |
2570 private: | |
2571 ConcurrentMark* _cm; | |
2572 | |
2573 public: | |
2574 void do_object(oop obj) { | |
2575 _cm->deal_with_reference(obj); | |
2576 } | |
2577 | |
2578 CMGlobalObjectClosure(ConcurrentMark* cm) : _cm(cm) { } | |
2579 }; | |
2580 | |
2581 void ConcurrentMark::deal_with_reference(oop obj) { | |
3771 | 2582 if (verbose_high()) { |
342 | 2583 gclog_or_tty->print_cr("[global] we're dealing with reference "PTR_FORMAT, |
2584 (void*) obj); | |
3771 | 2585 } |
342 | 2586 |
2587 HeapWord* objAddr = (HeapWord*) obj; | |
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2588 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
342 | 2589 if (_g1h->is_in_g1_reserved(objAddr)) { |
3771 | 2590 assert(obj != NULL, "null check is implicit"); |
2591 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
2592 // Only get the containing region if the object is not marked on the | |
2593 // bitmap (otherwise, it's a waste of time since we won't do | |
2594 // anything with it). | |
2595 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
2596 if (!hr->obj_allocated_since_next_marking(obj)) { | |
2597 if (verbose_high()) { | |
2598 gclog_or_tty->print_cr("[global] "PTR_FORMAT" is not considered " | |
2599 "marked", (void*) obj); | |
2600 } | |
2601 | |
2602 // we need to mark it first | |
2603 if (_nextMarkBitMap->parMark(objAddr)) { | |
2604 // No OrderAccess:store_load() is needed. It is implicit in the | |
2605 // CAS done in parMark(objAddr) above | |
2606 HeapWord* finger = _finger; | |
2607 if (objAddr < finger) { | |
2608 if (verbose_high()) { | |
2609 gclog_or_tty->print_cr("[global] below the global finger " | |
2610 "("PTR_FORMAT"), pushing it", finger); | |
2611 } | |
2612 if (!mark_stack_push(obj)) { | |
2613 if (verbose_low()) { | |
2614 gclog_or_tty->print_cr("[global] global stack overflow during " | |
2615 "deal_with_reference"); | |
2616 } | |
2617 } | |
342 | 2618 } |
2619 } | |
2620 } | |
2621 } | |
2622 } | |
2623 } | |
2624 | |
2625 void ConcurrentMark::drainAllSATBBuffers() { | |
2626 CMGlobalObjectClosure oc(this); | |
2627 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
2628 satb_mq_set.set_closure(&oc); | |
2629 | |
2630 while (satb_mq_set.apply_closure_to_completed_buffer()) { | |
2631 if (verbose_medium()) | |
2632 gclog_or_tty->print_cr("[global] processed an SATB buffer"); | |
2633 } | |
2634 | |
2635 // no need to check whether we should do this, as this is only | |
2636 // called during an evacuation pause | |
2637 satb_mq_set.iterate_closure_all_threads(); | |
2638 | |
2639 satb_mq_set.set_closure(NULL); | |
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2640 assert(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2641 } |
2642 | |
2643 void ConcurrentMark::markPrev(oop p) { | |
2644 // Note we are overriding the read-only view of the prev map here, via | |
2645 // the cast. | |
2646 ((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*)p); | |
2647 } | |
2648 | |
2649 void ConcurrentMark::clear(oop p) { | |
2650 assert(p != NULL && p->is_oop(), "expected an oop"); | |
2651 HeapWord* addr = (HeapWord*)p; | |
2652 assert(addr >= _nextMarkBitMap->startWord() || | |
2653 addr < _nextMarkBitMap->endWord(), "in a region"); | |
2654 | |
2655 _nextMarkBitMap->clear(addr); | |
2656 } | |
2657 | |
2658 void ConcurrentMark::clearRangeBothMaps(MemRegion mr) { | |
2659 // Note we are overriding the read-only view of the prev map here, via | |
2660 // the cast. | |
2661 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
2662 _nextMarkBitMap->clearRange(mr); | |
2663 } | |
2664 | |
2665 HeapRegion* | |
2666 ConcurrentMark::claim_region(int task_num) { | |
2667 // "checkpoint" the finger | |
2668 HeapWord* finger = _finger; | |
2669 | |
2670 // _heap_end will not change underneath our feet; it only changes at | |
2671 // yield points. | |
2672 while (finger < _heap_end) { | |
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2673 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2674 |
3771 | 2675 // Note on how this code handles humongous regions. In the |
2676 // normal case the finger will reach the start of a "starts | |
2677 // humongous" (SH) region. Its end will either be the end of the | |
2678 // last "continues humongous" (CH) region in the sequence, or the | |
2679 // standard end of the SH region (if the SH is the only region in | |
2680 // the sequence). That way claim_region() will skip over the CH | |
2681 // regions. However, there is a subtle race between a CM thread | |
2682 // executing this method and a mutator thread doing a humongous | |
2683 // object allocation. The two are not mutually exclusive as the CM | |
2684 // thread does not need to hold the Heap_lock when it gets | |
2685 // here. So there is a chance that claim_region() will come across | |
2686 // a free region that's in the progress of becoming a SH or a CH | |
2687 // region. In the former case, it will either | |
2688 // a) Miss the update to the region's end, in which case it will | |
2689 // visit every subsequent CH region, will find their bitmaps | |
2690 // empty, and do nothing, or | |
2691 // b) Will observe the update of the region's end (in which case | |
2692 // it will skip the subsequent CH regions). | |
2693 // If it comes across a region that suddenly becomes CH, the | |
2694 // scenario will be similar to b). So, the race between | |
2695 // claim_region() and a humongous object allocation might force us | |
2696 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2697 // iterations) but it should not introduce and correctness issues. | |
2698 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2699 HeapWord* bottom = curr_region->bottom(); |
2700 HeapWord* end = curr_region->end(); | |
2701 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2702 | |
3771 | 2703 if (verbose_low()) { |
342 | 2704 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
2705 "["PTR_FORMAT", "PTR_FORMAT"), " | |
2706 "limit = "PTR_FORMAT, | |
2707 task_num, curr_region, bottom, end, limit); | |
3771 | 2708 } |
2709 | |
2710 // Is the gap between reading the finger and doing the CAS too long? | |
2711 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2712 if (res == finger) { |
2713 // we succeeded | |
2714 | |
2715 // notice that _finger == end cannot be guaranteed here since, | |
2716 // someone else might have moved the finger even further | |
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2717 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2718 |
2719 if (verbose_low()) | |
2720 gclog_or_tty->print_cr("[%d] we were successful with region = " | |
2721 PTR_FORMAT, task_num, curr_region); | |
2722 | |
2723 if (limit > bottom) { | |
2724 if (verbose_low()) | |
2725 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " | |
2726 "returning it ", task_num, curr_region); | |
2727 return curr_region; | |
2728 } else { | |
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2729 assert(limit == bottom, |
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2730 "the region limit should be at bottom"); |
342 | 2731 if (verbose_low()) |
2732 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " | |
2733 "returning NULL", task_num, curr_region); | |
2734 // we return NULL and the caller should try calling | |
2735 // claim_region() again. | |
2736 return NULL; | |
2737 } | |
2738 } else { | |
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2739 assert(_finger > finger, "the finger should have moved forward"); |
342 | 2740 if (verbose_low()) |
2741 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " | |
2742 "global finger = "PTR_FORMAT", " | |
2743 "our finger = "PTR_FORMAT, | |
2744 task_num, _finger, finger); | |
2745 | |
2746 // read it again | |
2747 finger = _finger; | |
2748 } | |
2749 } | |
2750 | |
2751 return NULL; | |
2752 } | |
2753 | |
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2754 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
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2755 bool result = false; |
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2756 for (int i = 0; i < (int)_max_task_num; ++i) { |
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2757 CMTask* the_task = _tasks[i]; |
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2758 MemRegion mr = the_task->aborted_region(); |
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2759 if (mr.start() != NULL) { |
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2760 assert(mr.end() != NULL, "invariant"); |
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2761 assert(mr.word_size() > 0, "invariant"); |
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2762 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
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2763 assert(hr != NULL, "invariant"); |
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2764 if (hr->in_collection_set()) { |
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2765 // The region points into the collection set |
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2766 the_task->set_aborted_region(MemRegion()); |
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2767 result = true; |
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2768 } |
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2769 } |
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|
2770 } |
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2771 return result; |
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2772 } |
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2773 |
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2774 bool ConcurrentMark::has_aborted_regions() { |
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2775 for (int i = 0; i < (int)_max_task_num; ++i) { |
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2776 CMTask* the_task = _tasks[i]; |
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2777 MemRegion mr = the_task->aborted_region(); |
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2778 if (mr.start() != NULL) { |
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2779 assert(mr.end() != NULL, "invariant"); |
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2780 assert(mr.word_size() > 0, "invariant"); |
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2781 return true; |
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|
2782 } |
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|
2783 } |
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2784 return false; |
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|
2785 } |
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2786 |
342 | 2787 void ConcurrentMark::oops_do(OopClosure* cl) { |
2788 if (_markStack.size() > 0 && verbose_low()) | |
2789 gclog_or_tty->print_cr("[global] scanning the global marking stack, " | |
2790 "size = %d", _markStack.size()); | |
2791 // we first iterate over the contents of the mark stack... | |
2792 _markStack.oops_do(cl); | |
2793 | |
2794 for (int i = 0; i < (int)_max_task_num; ++i) { | |
2795 OopTaskQueue* queue = _task_queues->queue((int)i); | |
2796 | |
2797 if (queue->size() > 0 && verbose_low()) | |
2798 gclog_or_tty->print_cr("[global] scanning task queue of task %d, " | |
2799 "size = %d", i, queue->size()); | |
2800 | |
2801 // ...then over the contents of the all the task queues. | |
2802 queue->oops_do(cl); | |
2803 } | |
2804 | |
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2805 // Invalidate any entries, that are in the region stack, that |
342 | 2806 // point into the collection set |
2807 if (_regionStack.invalidate_entries_into_cset()) { | |
2808 // otherwise, any gray objects copied during the evacuation pause | |
2809 // might not be visited. | |
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2810 assert(_should_gray_objects, "invariant"); |
342 | 2811 } |
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2812 |
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2813 // Invalidate any aborted regions, recorded in the individual CM |
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2814 // tasks, that point into the collection set. |
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2815 if (invalidate_aborted_regions_in_cset()) { |
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2816 // otherwise, any gray objects copied during the evacuation pause |
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2817 // might not be visited. |
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2818 assert(_should_gray_objects, "invariant"); |
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2819 } |
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2820 |
342 | 2821 } |
2822 | |
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2823 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
342 | 2824 _markStack.setEmpty(); |
2825 _markStack.clear_overflow(); | |
2826 _regionStack.setEmpty(); | |
2827 _regionStack.clear_overflow(); | |
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2828 if (clear_overflow) { |
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2829 clear_has_overflown(); |
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2830 } else { |
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2831 assert(has_overflown(), "pre-condition"); |
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2832 } |
342 | 2833 _finger = _heap_start; |
2834 | |
2835 for (int i = 0; i < (int)_max_task_num; ++i) { | |
2836 OopTaskQueue* queue = _task_queues->queue(i); | |
2837 queue->set_empty(); | |
1885
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2838 // Clear any partial regions from the CMTasks |
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2839 _tasks[i]->clear_aborted_region(); |
342 | 2840 } |
2841 } | |
2842 | |
2843 void ConcurrentMark::print_stats() { | |
2844 if (verbose_stats()) { | |
2845 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
2846 for (size_t i = 0; i < _active_tasks; ++i) { | |
2847 _tasks[i]->print_stats(); | |
2848 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
2849 } | |
2850 } | |
2851 } | |
2852 | |
2853 class CSMarkOopClosure: public OopClosure { | |
2854 friend class CSMarkBitMapClosure; | |
2855 | |
2856 G1CollectedHeap* _g1h; | |
2857 CMBitMap* _bm; | |
2858 ConcurrentMark* _cm; | |
2859 oop* _ms; | |
2860 jint* _array_ind_stack; | |
2861 int _ms_size; | |
2862 int _ms_ind; | |
2863 int _array_increment; | |
2864 | |
2865 bool push(oop obj, int arr_ind = 0) { | |
2866 if (_ms_ind == _ms_size) { | |
2867 gclog_or_tty->print_cr("Mark stack is full."); | |
2868 return false; | |
2869 } | |
2870 _ms[_ms_ind] = obj; | |
2871 if (obj->is_objArray()) _array_ind_stack[_ms_ind] = arr_ind; | |
2872 _ms_ind++; | |
2873 return true; | |
2874 } | |
2875 | |
2876 oop pop() { | |
2877 if (_ms_ind == 0) return NULL; | |
2878 else { | |
2879 _ms_ind--; | |
2880 return _ms[_ms_ind]; | |
2881 } | |
2882 } | |
2883 | |
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2884 template <class T> bool drain() { |
342 | 2885 while (_ms_ind > 0) { |
2886 oop obj = pop(); | |
2887 assert(obj != NULL, "Since index was non-zero."); | |
2888 if (obj->is_objArray()) { | |
2889 jint arr_ind = _array_ind_stack[_ms_ind]; | |
2890 objArrayOop aobj = objArrayOop(obj); | |
2891 jint len = aobj->length(); | |
2892 jint next_arr_ind = arr_ind + _array_increment; | |
2893 if (next_arr_ind < len) { | |
2894 push(obj, next_arr_ind); | |
2895 } | |
2896 // Now process this portion of this one. | |
2897 int lim = MIN2(next_arr_ind, len); | |
2898 for (int j = arr_ind; j < lim; j++) { | |
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2899 do_oop(aobj->objArrayOopDesc::obj_at_addr<T>(j)); |
342 | 2900 } |
2901 | |
2902 } else { | |
2903 obj->oop_iterate(this); | |
2904 } | |
2905 if (abort()) return false; | |
2906 } | |
2907 return true; | |
2908 } | |
2909 | |
2910 public: | |
2911 CSMarkOopClosure(ConcurrentMark* cm, int ms_size) : | |
2912 _g1h(G1CollectedHeap::heap()), | |
2913 _cm(cm), | |
2914 _bm(cm->nextMarkBitMap()), | |
2915 _ms_size(ms_size), _ms_ind(0), | |
2916 _ms(NEW_C_HEAP_ARRAY(oop, ms_size)), | |
2917 _array_ind_stack(NEW_C_HEAP_ARRAY(jint, ms_size)), | |
2918 _array_increment(MAX2(ms_size/8, 16)) | |
2919 {} | |
2920 | |
2921 ~CSMarkOopClosure() { | |
2922 FREE_C_HEAP_ARRAY(oop, _ms); | |
2923 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
2924 } | |
2925 | |
845
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2926 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2927 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2928 |
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2929 template <class T> void do_oop_work(T* p) { |
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2930 T heap_oop = oopDesc::load_heap_oop(p); |
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2931 if (oopDesc::is_null(heap_oop)) return; |
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2932 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
342 | 2933 if (obj->is_forwarded()) { |
2934 // If the object has already been forwarded, we have to make sure | |
2935 // that it's marked. So follow the forwarding pointer. Note that | |
2936 // this does the right thing for self-forwarding pointers in the | |
2937 // evacuation failure case. | |
2938 obj = obj->forwardee(); | |
2939 } | |
2940 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
2941 if (hr != NULL) { | |
2942 if (hr->in_collection_set()) { | |
2943 if (_g1h->is_obj_ill(obj)) { | |
2944 _bm->mark((HeapWord*)obj); | |
2945 if (!push(obj)) { | |
2946 gclog_or_tty->print_cr("Setting abort in CSMarkOopClosure because push failed."); | |
2947 set_abort(); | |
2948 } | |
2949 } | |
2950 } else { | |
2951 // Outside the collection set; we need to gray it | |
2952 _cm->deal_with_reference(obj); | |
2953 } | |
2954 } | |
2955 } | |
2956 }; | |
2957 | |
2958 class CSMarkBitMapClosure: public BitMapClosure { | |
2959 G1CollectedHeap* _g1h; | |
2960 CMBitMap* _bitMap; | |
2961 ConcurrentMark* _cm; | |
2962 CSMarkOopClosure _oop_cl; | |
2963 public: | |
2964 CSMarkBitMapClosure(ConcurrentMark* cm, int ms_size) : | |
2965 _g1h(G1CollectedHeap::heap()), | |
2966 _bitMap(cm->nextMarkBitMap()), | |
2967 _oop_cl(cm, ms_size) | |
2968 {} | |
2969 | |
2970 ~CSMarkBitMapClosure() {} | |
2971 | |
2972 bool do_bit(size_t offset) { | |
2973 // convert offset into a HeapWord* | |
2974 HeapWord* addr = _bitMap->offsetToHeapWord(offset); | |
2975 assert(_bitMap->endWord() && addr < _bitMap->endWord(), | |
2976 "address out of range"); | |
2977 assert(_bitMap->isMarked(addr), "tautology"); | |
2978 oop obj = oop(addr); | |
2979 if (!obj->is_forwarded()) { | |
2980 if (!_oop_cl.push(obj)) return false; | |
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2981 if (UseCompressedOops) { |
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2982 if (!_oop_cl.drain<narrowOop>()) return false; |
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2983 } else { |
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2984 if (!_oop_cl.drain<oop>()) return false; |
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2985 } |
342 | 2986 } |
2987 // Otherwise... | |
2988 return true; | |
2989 } | |
2990 }; | |
2991 | |
2992 | |
2993 class CompleteMarkingInCSHRClosure: public HeapRegionClosure { | |
2994 CMBitMap* _bm; | |
2995 CSMarkBitMapClosure _bit_cl; | |
2996 enum SomePrivateConstants { | |
2997 MSSize = 1000 | |
2998 }; | |
2999 bool _completed; | |
3000 public: | |
3001 CompleteMarkingInCSHRClosure(ConcurrentMark* cm) : | |
3002 _bm(cm->nextMarkBitMap()), | |
3003 _bit_cl(cm, MSSize), | |
3004 _completed(true) | |
3005 {} | |
3006 | |
3007 ~CompleteMarkingInCSHRClosure() {} | |
3008 | |
3009 bool doHeapRegion(HeapRegion* r) { | |
3010 if (!r->evacuation_failed()) { | |
3011 MemRegion mr = MemRegion(r->bottom(), r->next_top_at_mark_start()); | |
3012 if (!mr.is_empty()) { | |
3013 if (!_bm->iterate(&_bit_cl, mr)) { | |
3014 _completed = false; | |
3015 return true; | |
3016 } | |
3017 } | |
3018 } | |
3019 return false; | |
3020 } | |
3021 | |
3022 bool completed() { return _completed; } | |
3023 }; | |
3024 | |
3025 class ClearMarksInHRClosure: public HeapRegionClosure { | |
3026 CMBitMap* _bm; | |
3027 public: | |
3028 ClearMarksInHRClosure(CMBitMap* bm): _bm(bm) { } | |
3029 | |
3030 bool doHeapRegion(HeapRegion* r) { | |
3031 if (!r->used_region().is_empty() && !r->evacuation_failed()) { | |
3032 MemRegion usedMR = r->used_region(); | |
3033 _bm->clearRange(r->used_region()); | |
3034 } | |
3035 return false; | |
3036 } | |
3037 }; | |
3038 | |
3039 void ConcurrentMark::complete_marking_in_collection_set() { | |
3040 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
3041 | |
3042 if (!g1h->mark_in_progress()) { | |
3043 g1h->g1_policy()->record_mark_closure_time(0.0); | |
3044 return; | |
3045 } | |
3046 | |
3047 int i = 1; | |
3048 double start = os::elapsedTime(); | |
3049 while (true) { | |
3050 i++; | |
3051 CompleteMarkingInCSHRClosure cmplt(this); | |
3052 g1h->collection_set_iterate(&cmplt); | |
3053 if (cmplt.completed()) break; | |
3054 } | |
3055 double end_time = os::elapsedTime(); | |
3056 double elapsed_time_ms = (end_time - start) * 1000.0; | |
3057 g1h->g1_policy()->record_mark_closure_time(elapsed_time_ms); | |
3058 | |
3059 ClearMarksInHRClosure clr(nextMarkBitMap()); | |
3060 g1h->collection_set_iterate(&clr); | |
3061 } | |
3062 | |
3063 // The next two methods deal with the following optimisation. Some | |
3064 // objects are gray by being marked and located above the finger. If | |
3065 // they are copied, during an evacuation pause, below the finger then | |
3066 // the need to be pushed on the stack. The observation is that, if | |
3067 // there are no regions in the collection set located above the | |
3068 // finger, then the above cannot happen, hence we do not need to | |
3069 // explicitly gray any objects when copying them to below the | |
3070 // finger. The global stack will be scanned to ensure that, if it | |
3071 // points to objects being copied, it will update their | |
3072 // location. There is a tricky situation with the gray objects in | |
3073 // region stack that are being coped, however. See the comment in | |
3074 // newCSet(). | |
3075 | |
3076 void ConcurrentMark::newCSet() { | |
3077 if (!concurrent_marking_in_progress()) | |
3078 // nothing to do if marking is not in progress | |
3079 return; | |
3080 | |
3081 // find what the lowest finger is among the global and local fingers | |
3082 _min_finger = _finger; | |
3083 for (int i = 0; i < (int)_max_task_num; ++i) { | |
3084 CMTask* task = _tasks[i]; | |
3085 HeapWord* task_finger = task->finger(); | |
3086 if (task_finger != NULL && task_finger < _min_finger) | |
3087 _min_finger = task_finger; | |
3088 } | |
3089 | |
3090 _should_gray_objects = false; | |
3091 | |
3092 // This fixes a very subtle and fustrating bug. It might be the case | |
3093 // that, during en evacuation pause, heap regions that contain | |
3094 // objects that are gray (by being in regions contained in the | |
3095 // region stack) are included in the collection set. Since such gray | |
3096 // objects will be moved, and because it's not easy to redirect | |
3097 // region stack entries to point to a new location (because objects | |
3098 // in one region might be scattered to multiple regions after they | |
3099 // are copied), one option is to ensure that all marked objects | |
3100 // copied during a pause are pushed on the stack. Notice, however, | |
3101 // that this problem can only happen when the region stack is not | |
3102 // empty during an evacuation pause. So, we make the fix a bit less | |
3103 // conservative and ensure that regions are pushed on the stack, | |
3104 // irrespective whether all collection set regions are below the | |
3105 // finger, if the region stack is not empty. This is expected to be | |
3106 // a rare case, so I don't think it's necessary to be smarted about it. | |
1835
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3107 if (!region_stack_empty() || has_aborted_regions()) |
342 | 3108 _should_gray_objects = true; |
3109 } | |
3110 | |
3111 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
3112 if (!concurrent_marking_in_progress()) | |
3113 return; | |
3114 | |
3115 HeapWord* region_end = hr->end(); | |
3116 if (region_end > _min_finger) | |
3117 _should_gray_objects = true; | |
3118 } | |
3119 | |
3378
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3120 // Resets the region fields of active CMTasks whose values point |
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3121 // into the collection set. |
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3122 void ConcurrentMark::reset_active_task_region_fields_in_cset() { |
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3123 assert(SafepointSynchronize::is_at_safepoint(), "should be in STW"); |
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3124 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
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3125 |
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3126 for (int i = 0; i < (int)parallel_marking_threads(); i += 1) { |
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3127 CMTask* task = _tasks[i]; |
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3128 HeapWord* task_finger = task->finger(); |
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3129 if (task_finger != NULL) { |
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3130 assert(_g1h->is_in_g1_reserved(task_finger), "not in heap"); |
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3131 HeapRegion* finger_region = _g1h->heap_region_containing(task_finger); |
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3132 if (finger_region->in_collection_set()) { |
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3133 // The task's current region is in the collection set. |
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3134 // This region will be evacuated in the current GC and |
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3135 // the region fields in the task will be stale. |
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|
3136 task->giveup_current_region(); |
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|
3137 } |
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|
3138 } |
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3139 } |
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|
3140 } |
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3141 |
342 | 3142 // abandon current marking iteration due to a Full GC |
3143 void ConcurrentMark::abort() { | |
3144 // Clear all marks to force marking thread to do nothing | |
3145 _nextMarkBitMap->clearAll(); | |
3146 // Empty mark stack | |
3147 clear_marking_state(); | |
1835
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3148 for (int i = 0; i < (int)_max_task_num; ++i) { |
342 | 3149 _tasks[i]->clear_region_fields(); |
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3150 } |
342 | 3151 _has_aborted = true; |
3152 | |
3153 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3154 satb_mq_set.abandon_partial_marking(); | |
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3155 // This can be called either during or outside marking, we'll read |
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3156 // the expected_active value from the SATB queue set. |
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3157 satb_mq_set.set_active_all_threads( |
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3158 false, /* new active value */ |
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3159 satb_mq_set.is_active() /* expected_active */); |
342 | 3160 } |
3161 | |
3162 static void print_ms_time_info(const char* prefix, const char* name, | |
3163 NumberSeq& ns) { | |
3164 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3165 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3166 if (ns.num() > 0) { | |
3167 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3168 prefix, ns.sd(), ns.maximum()); | |
3169 } | |
3170 } | |
3171 | |
3172 void ConcurrentMark::print_summary_info() { | |
3173 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3174 print_ms_time_info(" ", "init marks", _init_times); | |
3175 print_ms_time_info(" ", "remarks", _remark_times); | |
3176 { | |
3177 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3178 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3179 | |
3180 } | |
3181 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3182 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3183 _total_counting_time, | |
3184 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3185 (double)_cleanup_times.num() | |
3186 : 0.0)); | |
3187 if (G1ScrubRemSets) { | |
3188 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3189 _total_rs_scrub_time, | |
3190 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3191 (double)_cleanup_times.num() | |
3192 : 0.0)); | |
3193 } | |
3194 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3195 (_init_times.sum() + _remark_times.sum() + | |
3196 _cleanup_times.sum())/1000.0); | |
3197 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
3198 "(%8.2f s marking, %8.2f s counting).", | |
3199 cmThread()->vtime_accum(), | |
3200 cmThread()->vtime_mark_accum(), | |
3201 cmThread()->vtime_count_accum()); | |
3202 } | |
3203 | |
1019 | 3204 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
3205 _parallel_workers->print_worker_threads_on(st); | |
3206 } | |
3207 | |
342 | 3208 // Closures |
3209 // XXX: there seems to be a lot of code duplication here; | |
3210 // should refactor and consolidate the shared code. | |
3211 | |
3212 // This closure is used to mark refs into the CMS generation in | |
3213 // the CMS bit map. Called at the first checkpoint. | |
3214 | |
3215 // We take a break if someone is trying to stop the world. | |
3216 bool ConcurrentMark::do_yield_check(int worker_i) { | |
3217 if (should_yield()) { | |
3218 if (worker_i == 0) | |
3219 _g1h->g1_policy()->record_concurrent_pause(); | |
3220 cmThread()->yield(); | |
3221 if (worker_i == 0) | |
3222 _g1h->g1_policy()->record_concurrent_pause_end(); | |
3223 return true; | |
3224 } else { | |
3225 return false; | |
3226 } | |
3227 } | |
3228 | |
3229 bool ConcurrentMark::should_yield() { | |
3230 return cmThread()->should_yield(); | |
3231 } | |
3232 | |
3233 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3234 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3235 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3236 } | |
3237 | |
3238 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3239 void* last) { | |
3240 return | |
3241 containing_card_is_marked(start) && | |
3242 containing_card_is_marked(last); | |
3243 } | |
3244 | |
3245 #ifndef PRODUCT | |
3246 // for debugging purposes | |
3247 void ConcurrentMark::print_finger() { | |
3248 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3249 _heap_start, _heap_end, _finger); | |
3250 for (int i = 0; i < (int) _max_task_num; ++i) { | |
3251 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
3252 } | |
3253 gclog_or_tty->print_cr(""); | |
3254 } | |
3255 #endif | |
3256 | |
3771 | 3257 void CMTask::scan_object(oop obj) { |
3258 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3259 | |
3260 if (_cm->verbose_high()) { | |
3261 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
3262 _task_id, (void*) obj); | |
3263 } | |
3264 | |
3265 size_t obj_size = obj->size(); | |
3266 _words_scanned += obj_size; | |
3267 | |
3268 obj->oop_iterate(_cm_oop_closure); | |
3269 statsOnly( ++_objs_scanned ); | |
3270 check_limits(); | |
3271 } | |
3272 | |
342 | 3273 // Closure for iteration over bitmaps |
3274 class CMBitMapClosure : public BitMapClosure { | |
3275 private: | |
3276 // the bitmap that is being iterated over | |
3277 CMBitMap* _nextMarkBitMap; | |
3278 ConcurrentMark* _cm; | |
3279 CMTask* _task; | |
3280 // true if we're scanning a heap region claimed by the task (so that | |
3281 // we move the finger along), false if we're not, i.e. currently when | |
3282 // scanning a heap region popped from the region stack (so that we | |
3283 // do not move the task finger along; it'd be a mistake if we did so). | |
3284 bool _scanning_heap_region; | |
3285 | |
3286 public: | |
3287 CMBitMapClosure(CMTask *task, | |
3288 ConcurrentMark* cm, | |
3289 CMBitMap* nextMarkBitMap) | |
3290 : _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } | |
3291 | |
3292 void set_scanning_heap_region(bool scanning_heap_region) { | |
3293 _scanning_heap_region = scanning_heap_region; | |
3294 } | |
3295 | |
3296 bool do_bit(size_t offset) { | |
3297 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3298 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3299 assert( addr < _cm->finger(), "invariant"); |
342 | 3300 |
3301 if (_scanning_heap_region) { | |
3302 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
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3303 assert(addr >= _task->finger(), "invariant"); |
342 | 3304 // We move that task's local finger along. |
3305 _task->move_finger_to(addr); | |
3306 } else { | |
3307 // We move the task's region finger along. | |
3308 _task->move_region_finger_to(addr); | |
3309 } | |
3310 | |
3311 _task->scan_object(oop(addr)); | |
3312 // we only partially drain the local queue and global stack | |
3313 _task->drain_local_queue(true); | |
3314 _task->drain_global_stack(true); | |
3315 | |
3316 // if the has_aborted flag has been raised, we need to bail out of | |
3317 // the iteration | |
3318 return !_task->has_aborted(); | |
3319 } | |
3320 }; | |
3321 | |
3322 // Closure for iterating over objects, currently only used for | |
3323 // processing SATB buffers. | |
3324 class CMObjectClosure : public ObjectClosure { | |
3325 private: | |
3326 CMTask* _task; | |
3327 | |
3328 public: | |
3329 void do_object(oop obj) { | |
3330 _task->deal_with_reference(obj); | |
3331 } | |
3332 | |
3333 CMObjectClosure(CMTask* task) : _task(task) { } | |
3334 }; | |
3335 | |
3771 | 3336 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3337 ConcurrentMark* cm, | |
3338 CMTask* task) | |
3339 : _g1h(g1h), _cm(cm), _task(task) { | |
3340 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3341 | |
3342 if (G1UseConcMarkReferenceProcessing) { | |
3343 _ref_processor = g1h->ref_processor(); | |
3344 assert(_ref_processor != NULL, "should not be NULL"); | |
342 | 3345 } |
3771 | 3346 } |
342 | 3347 |
3348 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3349 // Separated the asserts so that we know which one fires. |
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3350 assert(hr != NULL, |
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3351 "claim_region() should have filtered out continues humongous regions"); |
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3352 assert(!hr->continuesHumongous(), |
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3353 "claim_region() should have filtered out continues humongous regions"); |
342 | 3354 |
3355 if (_cm->verbose_low()) | |
3356 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, | |
3357 _task_id, hr); | |
3358 | |
3359 _curr_region = hr; | |
3360 _finger = hr->bottom(); | |
3361 update_region_limit(); | |
3362 } | |
3363 | |
3364 void CMTask::update_region_limit() { | |
3365 HeapRegion* hr = _curr_region; | |
3366 HeapWord* bottom = hr->bottom(); | |
3367 HeapWord* limit = hr->next_top_at_mark_start(); | |
3368 | |
3369 if (limit == bottom) { | |
3370 if (_cm->verbose_low()) | |
3371 gclog_or_tty->print_cr("[%d] found an empty region " | |
3372 "["PTR_FORMAT", "PTR_FORMAT")", | |
3373 _task_id, bottom, limit); | |
3374 // The region was collected underneath our feet. | |
3375 // We set the finger to bottom to ensure that the bitmap | |
3376 // iteration that will follow this will not do anything. | |
3377 // (this is not a condition that holds when we set the region up, | |
3378 // as the region is not supposed to be empty in the first place) | |
3379 _finger = bottom; | |
3380 } else if (limit >= _region_limit) { | |
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3381 assert(limit >= _finger, "peace of mind"); |
342 | 3382 } else { |
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3383 assert(limit < _region_limit, "only way to get here"); |
342 | 3384 // This can happen under some pretty unusual circumstances. An |
3385 // evacuation pause empties the region underneath our feet (NTAMS | |
3386 // at bottom). We then do some allocation in the region (NTAMS | |
3387 // stays at bottom), followed by the region being used as a GC | |
3388 // alloc region (NTAMS will move to top() and the objects | |
3389 // originally below it will be grayed). All objects now marked in | |
3390 // the region are explicitly grayed, if below the global finger, | |
3391 // and we do not need in fact to scan anything else. So, we simply | |
3392 // set _finger to be limit to ensure that the bitmap iteration | |
3393 // doesn't do anything. | |
3394 _finger = limit; | |
3395 } | |
3396 | |
3397 _region_limit = limit; | |
3398 } | |
3399 | |
3400 void CMTask::giveup_current_region() { | |
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3401 assert(_curr_region != NULL, "invariant"); |
342 | 3402 if (_cm->verbose_low()) |
3403 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, | |
3404 _task_id, _curr_region); | |
3405 clear_region_fields(); | |
3406 } | |
3407 | |
3408 void CMTask::clear_region_fields() { | |
3409 // Values for these three fields that indicate that we're not | |
3410 // holding on to a region. | |
3411 _curr_region = NULL; | |
3412 _finger = NULL; | |
3413 _region_limit = NULL; | |
3414 | |
3415 _region_finger = NULL; | |
3416 } | |
3417 | |
3771 | 3418 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3419 if (cm_oop_closure == NULL) { | |
3420 assert(_cm_oop_closure != NULL, "invariant"); | |
3421 } else { | |
3422 assert(_cm_oop_closure == NULL, "invariant"); | |
3423 } | |
3424 _cm_oop_closure = cm_oop_closure; | |
3425 } | |
3426 | |
342 | 3427 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3428 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3429 |
3430 if (_cm->verbose_low()) | |
3431 gclog_or_tty->print_cr("[%d] resetting", _task_id); | |
3432 | |
3433 _nextMarkBitMap = nextMarkBitMap; | |
3434 clear_region_fields(); | |
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3435 assert(_aborted_region.is_empty(), "should have been cleared"); |
342 | 3436 |
3437 _calls = 0; | |
3438 _elapsed_time_ms = 0.0; | |
3439 _termination_time_ms = 0.0; | |
3440 _termination_start_time_ms = 0.0; | |
3441 | |
3442 #if _MARKING_STATS_ | |
3443 _local_pushes = 0; | |
3444 _local_pops = 0; | |
3445 _local_max_size = 0; | |
3446 _objs_scanned = 0; | |
3447 _global_pushes = 0; | |
3448 _global_pops = 0; | |
3449 _global_max_size = 0; | |
3450 _global_transfers_to = 0; | |
3451 _global_transfers_from = 0; | |
3452 _region_stack_pops = 0; | |
3453 _regions_claimed = 0; | |
3454 _objs_found_on_bitmap = 0; | |
3455 _satb_buffers_processed = 0; | |
3456 _steal_attempts = 0; | |
3457 _steals = 0; | |
3458 _aborted = 0; | |
3459 _aborted_overflow = 0; | |
3460 _aborted_cm_aborted = 0; | |
3461 _aborted_yield = 0; | |
3462 _aborted_timed_out = 0; | |
3463 _aborted_satb = 0; | |
3464 _aborted_termination = 0; | |
3465 #endif // _MARKING_STATS_ | |
3466 } | |
3467 | |
3468 bool CMTask::should_exit_termination() { | |
3469 regular_clock_call(); | |
3470 // This is called when we are in the termination protocol. We should | |
3471 // quit if, for some reason, this task wants to abort or the global | |
3472 // stack is not empty (this means that we can get work from it). | |
3473 return !_cm->mark_stack_empty() || has_aborted(); | |
3474 } | |
3475 | |
3476 void CMTask::reached_limit() { | |
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3477 assert(_words_scanned >= _words_scanned_limit || |
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3478 _refs_reached >= _refs_reached_limit , |
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3479 "shouldn't have been called otherwise"); |
342 | 3480 regular_clock_call(); |
3481 } | |
3482 | |
3483 void CMTask::regular_clock_call() { | |
3484 if (has_aborted()) | |
3485 return; | |
3486 | |
3487 // First, we need to recalculate the words scanned and refs reached | |
3488 // limits for the next clock call. | |
3489 recalculate_limits(); | |
3490 | |
3491 // During the regular clock call we do the following | |
3492 | |
3493 // (1) If an overflow has been flagged, then we abort. | |
3494 if (_cm->has_overflown()) { | |
3495 set_has_aborted(); | |
3496 return; | |
3497 } | |
3498 | |
3499 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3500 // to check anything else. The other steps are only needed during | |
3501 // the concurrent marking phase. | |
3502 if (!concurrent()) | |
3503 return; | |
3504 | |
3505 // (2) If marking has been aborted for Full GC, then we also abort. | |
3506 if (_cm->has_aborted()) { | |
3507 set_has_aborted(); | |
3508 statsOnly( ++_aborted_cm_aborted ); | |
3509 return; | |
3510 } | |
3511 | |
3512 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3513 | |
3514 // (3) If marking stats are enabled, then we update the step history. | |
3515 #if _MARKING_STATS_ | |
3516 if (_words_scanned >= _words_scanned_limit) | |
3517 ++_clock_due_to_scanning; | |
3518 if (_refs_reached >= _refs_reached_limit) | |
3519 ++_clock_due_to_marking; | |
3520 | |
3521 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3522 _interval_start_time_ms = curr_time_ms; | |
3523 _all_clock_intervals_ms.add(last_interval_ms); | |
3524 | |
3525 if (_cm->verbose_medium()) { | |
3526 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " | |
3527 "scanned = %d%s, refs reached = %d%s", | |
3528 _task_id, last_interval_ms, | |
3529 _words_scanned, | |
3530 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", | |
3531 _refs_reached, | |
3532 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); | |
3533 } | |
3534 #endif // _MARKING_STATS_ | |
3535 | |
3536 // (4) We check whether we should yield. If we have to, then we abort. | |
3537 if (_cm->should_yield()) { | |
3538 // We should yield. To do this we abort the task. The caller is | |
3539 // responsible for yielding. | |
3540 set_has_aborted(); | |
3541 statsOnly( ++_aborted_yield ); | |
3542 return; | |
3543 } | |
3544 | |
3545 // (5) We check whether we've reached our time quota. If we have, | |
3546 // then we abort. | |
3547 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3548 if (elapsed_time_ms > _time_target_ms) { | |
3549 set_has_aborted(); | |
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3550 _has_timed_out = true; |
342 | 3551 statsOnly( ++_aborted_timed_out ); |
3552 return; | |
3553 } | |
3554 | |
3555 // (6) Finally, we check whether there are enough completed STAB | |
3556 // buffers available for processing. If there are, we abort. | |
3557 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3558 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
3559 if (_cm->verbose_low()) | |
3560 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", | |
3561 _task_id); | |
3562 // we do need to process SATB buffers, we'll abort and restart | |
3563 // the marking task to do so | |
3564 set_has_aborted(); | |
3565 statsOnly( ++_aborted_satb ); | |
3566 return; | |
3567 } | |
3568 } | |
3569 | |
3570 void CMTask::recalculate_limits() { | |
3571 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3572 _words_scanned_limit = _real_words_scanned_limit; | |
3573 | |
3574 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3575 _refs_reached_limit = _real_refs_reached_limit; | |
3576 } | |
3577 | |
3578 void CMTask::decrease_limits() { | |
3579 // This is called when we believe that we're going to do an infrequent | |
3580 // operation which will increase the per byte scanned cost (i.e. move | |
3581 // entries to/from the global stack). It basically tries to decrease the | |
3582 // scanning limit so that the clock is called earlier. | |
3583 | |
3584 if (_cm->verbose_medium()) | |
3585 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); | |
3586 | |
3587 _words_scanned_limit = _real_words_scanned_limit - | |
3588 3 * words_scanned_period / 4; | |
3589 _refs_reached_limit = _real_refs_reached_limit - | |
3590 3 * refs_reached_period / 4; | |
3591 } | |
3592 | |
3593 void CMTask::move_entries_to_global_stack() { | |
3594 // local array where we'll store the entries that will be popped | |
3595 // from the local queue | |
3596 oop buffer[global_stack_transfer_size]; | |
3597 | |
3598 int n = 0; | |
3599 oop obj; | |
3600 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3601 buffer[n] = obj; | |
3602 ++n; | |
3603 } | |
3604 | |
3605 if (n > 0) { | |
3606 // we popped at least one entry from the local queue | |
3607 | |
3608 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3609 | |
3610 if (!_cm->mark_stack_push(buffer, n)) { | |
3611 if (_cm->verbose_low()) | |
3612 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", _task_id); | |
3613 set_has_aborted(); | |
3614 } else { | |
3615 // the transfer was successful | |
3616 | |
3617 if (_cm->verbose_medium()) | |
3618 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", | |
3619 _task_id, n); | |
3620 statsOnly( int tmp_size = _cm->mark_stack_size(); | |
3621 if (tmp_size > _global_max_size) | |
3622 _global_max_size = tmp_size; | |
3623 _global_pushes += n ); | |
3624 } | |
3625 } | |
3626 | |
3627 // this operation was quite expensive, so decrease the limits | |
3628 decrease_limits(); | |
3629 } | |
3630 | |
3631 void CMTask::get_entries_from_global_stack() { | |
3632 // local array where we'll store the entries that will be popped | |
3633 // from the global stack. | |
3634 oop buffer[global_stack_transfer_size]; | |
3635 int n; | |
3636 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3637 assert(n <= global_stack_transfer_size, |
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3638 "we should not pop more than the given limit"); |
342 | 3639 if (n > 0) { |
3640 // yes, we did actually pop at least one entry | |
3641 | |
3642 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
3643 if (_cm->verbose_medium()) | |
3644 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", | |
3645 _task_id, n); | |
3646 for (int i = 0; i < n; ++i) { | |
3647 bool success = _task_queue->push(buffer[i]); | |
3648 // We only call this when the local queue is empty or under a | |
3649 // given target limit. So, we do not expect this push to fail. | |
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3650 assert(success, "invariant"); |
342 | 3651 } |
3652 | |
3653 statsOnly( int tmp_size = _task_queue->size(); | |
3654 if (tmp_size > _local_max_size) | |
3655 _local_max_size = tmp_size; | |
3656 _local_pushes += n ); | |
3657 } | |
3658 | |
3659 // this operation was quite expensive, so decrease the limits | |
3660 decrease_limits(); | |
3661 } | |
3662 | |
3663 void CMTask::drain_local_queue(bool partially) { | |
3664 if (has_aborted()) | |
3665 return; | |
3666 | |
3667 // Decide what the target size is, depending whether we're going to | |
3668 // drain it partially (so that other tasks can steal if they run out | |
3669 // of things to do) or totally (at the very end). | |
3670 size_t target_size; | |
3671 if (partially) | |
3672 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); | |
3673 else | |
3674 target_size = 0; | |
3675 | |
3676 if (_task_queue->size() > target_size) { | |
3677 if (_cm->verbose_high()) | |
3678 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", | |
3679 _task_id, target_size); | |
3680 | |
3681 oop obj; | |
3682 bool ret = _task_queue->pop_local(obj); | |
3683 while (ret) { | |
3684 statsOnly( ++_local_pops ); | |
3685 | |
3686 if (_cm->verbose_high()) | |
3687 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, | |
3688 (void*) obj); | |
3689 | |
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3690 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3691 assert(!_g1h->is_on_master_free_list( |
2152 | 3692 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3693 |
3694 scan_object(obj); | |
3695 | |
3696 if (_task_queue->size() <= target_size || has_aborted()) | |
3697 ret = false; | |
3698 else | |
3699 ret = _task_queue->pop_local(obj); | |
3700 } | |
3701 | |
3702 if (_cm->verbose_high()) | |
3703 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", | |
3704 _task_id, _task_queue->size()); | |
3705 } | |
3706 } | |
3707 | |
3708 void CMTask::drain_global_stack(bool partially) { | |
3709 if (has_aborted()) | |
3710 return; | |
3711 | |
3712 // We have a policy to drain the local queue before we attempt to | |
3713 // drain the global stack. | |
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3714 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3715 |
3716 // Decide what the target size is, depending whether we're going to | |
3717 // drain it partially (so that other tasks can steal if they run out | |
3718 // of things to do) or totally (at the very end). Notice that, | |
3719 // because we move entries from the global stack in chunks or | |
3720 // because another task might be doing the same, we might in fact | |
3721 // drop below the target. But, this is not a problem. | |
3722 size_t target_size; | |
3723 if (partially) | |
3724 target_size = _cm->partial_mark_stack_size_target(); | |
3725 else | |
3726 target_size = 0; | |
3727 | |
3728 if (_cm->mark_stack_size() > target_size) { | |
3729 if (_cm->verbose_low()) | |
3730 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", | |
3731 _task_id, target_size); | |
3732 | |
3733 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3734 get_entries_from_global_stack(); | |
3735 drain_local_queue(partially); | |
3736 } | |
3737 | |
3738 if (_cm->verbose_low()) | |
3739 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", | |
3740 _task_id, _cm->mark_stack_size()); | |
3741 } | |
3742 } | |
3743 | |
3744 // SATB Queue has several assumptions on whether to call the par or | |
3745 // non-par versions of the methods. this is why some of the code is | |
3746 // replicated. We should really get rid of the single-threaded version | |
3747 // of the code to simplify things. | |
3748 void CMTask::drain_satb_buffers() { | |
3749 if (has_aborted()) | |
3750 return; | |
3751 | |
3752 // We set this so that the regular clock knows that we're in the | |
3753 // middle of draining buffers and doesn't set the abort flag when it | |
3754 // notices that SATB buffers are available for draining. It'd be | |
3755 // very counter productive if it did that. :-) | |
3756 _draining_satb_buffers = true; | |
3757 | |
3758 CMObjectClosure oc(this); | |
3759 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
1833
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3760 if (G1CollectedHeap::use_parallel_gc_threads()) |
342 | 3761 satb_mq_set.set_par_closure(_task_id, &oc); |
3762 else | |
3763 satb_mq_set.set_closure(&oc); | |
3764 | |
3765 // This keeps claiming and applying the closure to completed buffers | |
3766 // until we run out of buffers or we need to abort. | |
1833
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3767 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3768 while (!has_aborted() && |
3769 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
3770 if (_cm->verbose_medium()) | |
3771 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); | |
3772 statsOnly( ++_satb_buffers_processed ); | |
3773 regular_clock_call(); | |
3774 } | |
3775 } else { | |
3776 while (!has_aborted() && | |
3777 satb_mq_set.apply_closure_to_completed_buffer()) { | |
3778 if (_cm->verbose_medium()) | |
3779 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); | |
3780 statsOnly( ++_satb_buffers_processed ); | |
3781 regular_clock_call(); | |
3782 } | |
3783 } | |
3784 | |
3785 if (!concurrent() && !has_aborted()) { | |
3786 // We should only do this during remark. | |
1833
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3787 if (G1CollectedHeap::use_parallel_gc_threads()) |
342 | 3788 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
3789 else | |
3790 satb_mq_set.iterate_closure_all_threads(); | |
3791 } | |
3792 | |
3793 _draining_satb_buffers = false; | |
3794 | |
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3795 assert(has_aborted() || |
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3796 concurrent() || |
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3797 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3798 |
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3799 if (G1CollectedHeap::use_parallel_gc_threads()) |
342 | 3800 satb_mq_set.set_par_closure(_task_id, NULL); |
3801 else | |
3802 satb_mq_set.set_closure(NULL); | |
3803 | |
3804 // again, this was a potentially expensive operation, decrease the | |
3805 // limits to get the regular clock call early | |
3806 decrease_limits(); | |
3807 } | |
3808 | |
3809 void CMTask::drain_region_stack(BitMapClosure* bc) { | |
3810 if (has_aborted()) | |
3811 return; | |
3812 | |
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3813 assert(_region_finger == NULL, |
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3814 "it should be NULL when we're not scanning a region"); |
342 | 3815 |
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3816 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
342 | 3817 if (_cm->verbose_low()) |
3818 gclog_or_tty->print_cr("[%d] draining region stack, size = %d", | |
3819 _task_id, _cm->region_stack_size()); | |
3820 | |
1835
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3821 MemRegion mr; |
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3822 |
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3823 if (!_aborted_region.is_empty()) { |
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3824 mr = _aborted_region; |
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3825 _aborted_region = MemRegion(); |
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3826 |
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|
3827 if (_cm->verbose_low()) |
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3828 gclog_or_tty->print_cr("[%d] scanning aborted region [ " PTR_FORMAT ", " PTR_FORMAT " )", |
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3829 _task_id, mr.start(), mr.end()); |
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|
3830 } else { |
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|
3831 mr = _cm->region_stack_pop_lock_free(); |
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3832 // it returns MemRegion() if the pop fails |
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3833 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
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3834 } |
342 | 3835 |
3836 while (mr.start() != NULL) { | |
3837 if (_cm->verbose_medium()) | |
3838 gclog_or_tty->print_cr("[%d] we are scanning region " | |
3839 "["PTR_FORMAT", "PTR_FORMAT")", | |
3840 _task_id, mr.start(), mr.end()); | |
1835
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3841 |
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3842 assert(mr.end() <= _cm->finger(), |
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|
3843 "otherwise the region shouldn't be on the stack"); |
342 | 3844 assert(!mr.is_empty(), "Only non-empty regions live on the region stack"); |
3845 if (_nextMarkBitMap->iterate(bc, mr)) { | |
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3846 assert(!has_aborted(), |
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3847 "cannot abort the task without aborting the bitmap iteration"); |
342 | 3848 |
3849 // We finished iterating over the region without aborting. | |
3850 regular_clock_call(); | |
3851 if (has_aborted()) | |
3852 mr = MemRegion(); | |
3853 else { | |
1835
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3854 mr = _cm->region_stack_pop_lock_free(); |
342 | 3855 // it returns MemRegion() if the pop fails |
3856 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); | |
3857 } | |
3858 } else { | |
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3859 assert(has_aborted(), "currently the only way to do so"); |
342 | 3860 |
3861 // The only way to abort the bitmap iteration is to return | |
3862 // false from the do_bit() method. However, inside the | |
3863 // do_bit() method we move the _region_finger to point to the | |
3864 // object currently being looked at. So, if we bail out, we | |
3865 // have definitely set _region_finger to something non-null. | |
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3866 assert(_region_finger != NULL, "invariant"); |
342 | 3867 |
1835
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3868 // Make sure that any previously aborted region has been |
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|
3869 // cleared. |
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3870 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
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3871 |
342 | 3872 // The iteration was actually aborted. So now _region_finger |
3873 // points to the address of the object we last scanned. If we | |
3874 // leave it there, when we restart this task, we will rescan | |
3875 // the object. It is easy to avoid this. We move the finger by | |
3876 // enough to point to the next possible object header (the | |
3877 // bitmap knows by how much we need to move it as it knows its | |
3878 // granularity). | |
3879 MemRegion newRegion = | |
3880 MemRegion(_nextMarkBitMap->nextWord(_region_finger), mr.end()); | |
3881 | |
3882 if (!newRegion.is_empty()) { | |
3883 if (_cm->verbose_low()) { | |
1835
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|
3884 gclog_or_tty->print_cr("[%d] recording unscanned region" |
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3885 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
342 | 3886 _task_id, |
3887 newRegion.start(), newRegion.end()); | |
3888 } | |
1835
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3889 // Now record the part of the region we didn't scan to |
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3890 // make sure this task scans it later. |
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3891 _aborted_region = newRegion; |
342 | 3892 } |
3893 // break from while | |
3894 mr = MemRegion(); | |
3895 } | |
3896 _region_finger = NULL; | |
3897 } | |
3898 | |
3899 if (_cm->verbose_low()) | |
3900 gclog_or_tty->print_cr("[%d] drained region stack, size = %d", | |
3901 _task_id, _cm->region_stack_size()); | |
3902 } | |
3903 } | |
3904 | |
3905 void CMTask::print_stats() { | |
3906 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
3907 _task_id, _calls); | |
3908 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
3909 _elapsed_time_ms, _termination_time_ms); | |
3910 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3911 _step_times_ms.num(), _step_times_ms.avg(), | |
3912 _step_times_ms.sd()); | |
3913 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3914 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3915 | |
3916 #if _MARKING_STATS_ | |
3917 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3918 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3919 _all_clock_intervals_ms.sd()); | |
3920 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3921 _all_clock_intervals_ms.maximum(), | |
3922 _all_clock_intervals_ms.sum()); | |
3923 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3924 _clock_due_to_scanning, _clock_due_to_marking); | |
3925 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3926 _objs_scanned, _objs_found_on_bitmap); | |
3927 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3928 _local_pushes, _local_pops, _local_max_size); | |
3929 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3930 _global_pushes, _global_pops, _global_max_size); | |
3931 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3932 _global_transfers_to,_global_transfers_from); | |
3933 gclog_or_tty->print_cr(" Regions: claimed = %d, Region Stack: pops = %d", | |
3934 _regions_claimed, _region_stack_pops); | |
3935 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); | |
3936 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3937 _steal_attempts, _steals); | |
3938 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3939 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3940 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3941 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3942 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3943 #endif // _MARKING_STATS_ | |
3944 } | |
3945 | |
3946 /***************************************************************************** | |
3947 | |
3948 The do_marking_step(time_target_ms) method is the building block | |
3949 of the parallel marking framework. It can be called in parallel | |
3950 with other invocations of do_marking_step() on different tasks | |
3951 (but only one per task, obviously) and concurrently with the | |
3952 mutator threads, or during remark, hence it eliminates the need | |
3953 for two versions of the code. When called during remark, it will | |
3954 pick up from where the task left off during the concurrent marking | |
3955 phase. Interestingly, tasks are also claimable during evacuation | |
3956 pauses too, since do_marking_step() ensures that it aborts before | |
3957 it needs to yield. | |
3958 | |
3959 The data structures that is uses to do marking work are the | |
3960 following: | |
3961 | |
3962 (1) Marking Bitmap. If there are gray objects that appear only | |
3963 on the bitmap (this happens either when dealing with an overflow | |
3964 or when the initial marking phase has simply marked the roots | |
3965 and didn't push them on the stack), then tasks claim heap | |
3966 regions whose bitmap they then scan to find gray objects. A | |
3967 global finger indicates where the end of the last claimed region | |
3968 is. A local finger indicates how far into the region a task has | |
3969 scanned. The two fingers are used to determine how to gray an | |
3970 object (i.e. whether simply marking it is OK, as it will be | |
3971 visited by a task in the future, or whether it needs to be also | |
3972 pushed on a stack). | |
3973 | |
3974 (2) Local Queue. The local queue of the task which is accessed | |
3975 reasonably efficiently by the task. Other tasks can steal from | |
3976 it when they run out of work. Throughout the marking phase, a | |
3977 task attempts to keep its local queue short but not totally | |
3978 empty, so that entries are available for stealing by other | |
3979 tasks. Only when there is no more work, a task will totally | |
3980 drain its local queue. | |
3981 | |
3982 (3) Global Mark Stack. This handles local queue overflow. During | |
3983 marking only sets of entries are moved between it and the local | |
3984 queues, as access to it requires a mutex and more fine-grain | |
3985 interaction with it which might cause contention. If it | |
3986 overflows, then the marking phase should restart and iterate | |
3987 over the bitmap to identify gray objects. Throughout the marking | |
3988 phase, tasks attempt to keep the global mark stack at a small | |
3989 length but not totally empty, so that entries are available for | |
3990 popping by other tasks. Only when there is no more work, tasks | |
3991 will totally drain the global mark stack. | |
3992 | |
3993 (4) Global Region Stack. Entries on it correspond to areas of | |
3994 the bitmap that need to be scanned since they contain gray | |
3995 objects. Pushes on the region stack only happen during | |
3996 evacuation pauses and typically correspond to areas covered by | |
3997 GC LABS. If it overflows, then the marking phase should restart | |
3998 and iterate over the bitmap to identify gray objects. Tasks will | |
3999 try to totally drain the region stack as soon as possible. | |
4000 | |
4001 (5) SATB Buffer Queue. This is where completed SATB buffers are | |
4002 made available. Buffers are regularly removed from this queue | |
4003 and scanned for roots, so that the queue doesn't get too | |
4004 long. During remark, all completed buffers are processed, as | |
4005 well as the filled in parts of any uncompleted buffers. | |
4006 | |
4007 The do_marking_step() method tries to abort when the time target | |
4008 has been reached. There are a few other cases when the | |
4009 do_marking_step() method also aborts: | |
4010 | |
4011 (1) When the marking phase has been aborted (after a Full GC). | |
4012 | |
4013 (2) When a global overflow (either on the global stack or the | |
4014 region stack) has been triggered. Before the task aborts, it | |
4015 will actually sync up with the other tasks to ensure that all | |
4016 the marking data structures (local queues, stacks, fingers etc.) | |
4017 are re-initialised so that when do_marking_step() completes, | |
4018 the marking phase can immediately restart. | |
4019 | |
4020 (3) When enough completed SATB buffers are available. The | |
4021 do_marking_step() method only tries to drain SATB buffers right | |
4022 at the beginning. So, if enough buffers are available, the | |
4023 marking step aborts and the SATB buffers are processed at | |
4024 the beginning of the next invocation. | |
4025 | |
4026 (4) To yield. when we have to yield then we abort and yield | |
4027 right at the end of do_marking_step(). This saves us from a lot | |
4028 of hassle as, by yielding we might allow a Full GC. If this | |
4029 happens then objects will be compacted underneath our feet, the | |
4030 heap might shrink, etc. We save checking for this by just | |
4031 aborting and doing the yield right at the end. | |
4032 | |
4033 From the above it follows that the do_marking_step() method should | |
4034 be called in a loop (or, otherwise, regularly) until it completes. | |
4035 | |
4036 If a marking step completes without its has_aborted() flag being | |
4037 true, it means it has completed the current marking phase (and | |
4038 also all other marking tasks have done so and have all synced up). | |
4039 | |
4040 A method called regular_clock_call() is invoked "regularly" (in | |
4041 sub ms intervals) throughout marking. It is this clock method that | |
4042 checks all the abort conditions which were mentioned above and | |
4043 decides when the task should abort. A work-based scheme is used to | |
4044 trigger this clock method: when the number of object words the | |
4045 marking phase has scanned or the number of references the marking | |
4046 phase has visited reach a given limit. Additional invocations to | |
4047 the method clock have been planted in a few other strategic places | |
4048 too. The initial reason for the clock method was to avoid calling | |
4049 vtime too regularly, as it is quite expensive. So, once it was in | |
4050 place, it was natural to piggy-back all the other conditions on it | |
4051 too and not constantly check them throughout the code. | |
4052 | |
4053 *****************************************************************************/ | |
4054 | |
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4055 void CMTask::do_marking_step(double time_target_ms, |
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|
4056 bool do_stealing, |
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|
4057 bool do_termination) { |
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|
4058 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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|
4059 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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|
4060 |
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4061 assert(concurrent() || _cm->region_stack_empty(), |
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4062 "the region stack should have been cleared before remark"); |
1835
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|
4063 assert(concurrent() || !_cm->has_aborted_regions(), |
4805b9f4779e
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|
4064 "aborted regions should have been cleared before remark"); |
1023
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|
4065 assert(_region_finger == NULL, |
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|
4066 "this should be non-null only when a region is being scanned"); |
342 | 4067 |
4068 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
1023
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|
4069 assert(_task_queues != NULL, "invariant"); |
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|
4070 assert(_task_queue != NULL, "invariant"); |
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4071 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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4072 |
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4073 assert(!_claimed, |
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4074 "only one thread should claim this task at any one time"); |
342 | 4075 |
4076 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4077 // possible for two threads to set the _claimed flag at the same | |
4078 // time. But it is only for debugging purposes anyway and it will | |
4079 // catch most problems. | |
4080 _claimed = true; | |
4081 | |
4082 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4083 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4084 | |
4085 double diff_prediction_ms = | |
4086 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4087 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4088 | |
4089 // set up the variables that are used in the work-based scheme to | |
4090 // call the regular clock method | |
4091 _words_scanned = 0; | |
4092 _refs_reached = 0; | |
4093 recalculate_limits(); | |
4094 | |
4095 // clear all flags | |
4096 clear_has_aborted(); | |
2174
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4097 _has_timed_out = false; |
342 | 4098 _draining_satb_buffers = false; |
4099 | |
4100 ++_calls; | |
4101 | |
4102 if (_cm->verbose_low()) | |
4103 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " | |
4104 "target = %1.2lfms >>>>>>>>>>", | |
4105 _task_id, _calls, _time_target_ms); | |
4106 | |
4107 // Set up the bitmap and oop closures. Anything that uses them is | |
4108 // eventually called from this method, so it is OK to allocate these | |
4109 // statically. | |
4110 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4111 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4112 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4113 |
4114 if (_cm->has_overflown()) { | |
4115 // This can happen if the region stack or the mark stack overflows | |
4116 // during a GC pause and this task, after a yield point, | |
4117 // restarts. We have to abort as we need to get into the overflow | |
4118 // protocol which happens right at the end of this task. | |
4119 set_has_aborted(); | |
4120 } | |
4121 | |
4122 // First drain any available SATB buffers. After this, we will not | |
4123 // look at SATB buffers before the next invocation of this method. | |
4124 // If enough completed SATB buffers are queued up, the regular clock | |
4125 // will abort this task so that it restarts. | |
4126 drain_satb_buffers(); | |
4127 // ...then partially drain the local queue and the global stack | |
4128 drain_local_queue(true); | |
4129 drain_global_stack(true); | |
4130 | |
4131 // Then totally drain the region stack. We will not look at | |
4132 // it again before the next invocation of this method. Entries on | |
4133 // the region stack are only added during evacuation pauses, for | |
4134 // which we have to yield. When we do, we abort the task anyway so | |
4135 // it will look at the region stack again when it restarts. | |
4136 bitmap_closure.set_scanning_heap_region(false); | |
4137 drain_region_stack(&bitmap_closure); | |
4138 // ...then partially drain the local queue and the global stack | |
4139 drain_local_queue(true); | |
4140 drain_global_stack(true); | |
4141 | |
4142 do { | |
4143 if (!has_aborted() && _curr_region != NULL) { | |
4144 // This means that we're already holding on to a region. | |
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4145 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4146 "should not be NULL either"); |
342 | 4147 |
4148 // We might have restarted this task after an evacuation pause | |
4149 // which might have evacuated the region we're holding on to | |
4150 // underneath our feet. Let's read its limit again to make sure | |
4151 // that we do not iterate over a region of the heap that | |
4152 // contains garbage (update_region_limit() will also move | |
4153 // _finger to the start of the region if it is found empty). | |
4154 update_region_limit(); | |
4155 // We will start from _finger not from the start of the region, | |
4156 // as we might be restarting this task after aborting half-way | |
4157 // through scanning this region. In this case, _finger points to | |
4158 // the address where we last found a marked object. If this is a | |
4159 // fresh region, _finger points to start(). | |
4160 MemRegion mr = MemRegion(_finger, _region_limit); | |
4161 | |
4162 if (_cm->verbose_low()) | |
4163 gclog_or_tty->print_cr("[%d] we're scanning part " | |
4164 "["PTR_FORMAT", "PTR_FORMAT") " | |
4165 "of region "PTR_FORMAT, | |
4166 _task_id, _finger, _region_limit, _curr_region); | |
4167 | |
4168 // Let's iterate over the bitmap of the part of the | |
4169 // region that is left. | |
4170 bitmap_closure.set_scanning_heap_region(true); | |
4171 if (mr.is_empty() || | |
4172 _nextMarkBitMap->iterate(&bitmap_closure, mr)) { | |
4173 // We successfully completed iterating over the region. Now, | |
4174 // let's give up the region. | |
4175 giveup_current_region(); | |
4176 regular_clock_call(); | |
4177 } else { | |
1023
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4178 assert(has_aborted(), "currently the only way to do so"); |
342 | 4179 // The only way to abort the bitmap iteration is to return |
4180 // false from the do_bit() method. However, inside the | |
4181 // do_bit() method we move the _finger to point to the | |
4182 // object currently being looked at. So, if we bail out, we | |
4183 // have definitely set _finger to something non-null. | |
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4184 assert(_finger != NULL, "invariant"); |
342 | 4185 |
4186 // Region iteration was actually aborted. So now _finger | |
4187 // points to the address of the object we last scanned. If we | |
4188 // leave it there, when we restart this task, we will rescan | |
4189 // the object. It is easy to avoid this. We move the finger by | |
4190 // enough to point to the next possible object header (the | |
4191 // bitmap knows by how much we need to move it as it knows its | |
4192 // granularity). | |
1314
3f0549ed0c98
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4193 assert(_finger < _region_limit, "invariant"); |
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6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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4194 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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4195 // Check if bitmap iteration was aborted while scanning the last object |
3f0549ed0c98
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4196 if (new_finger >= _region_limit) { |
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4197 giveup_current_region(); |
3f0549ed0c98
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4198 } else { |
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|
4199 move_finger_to(new_finger); |
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|
4200 } |
342 | 4201 } |
4202 } | |
4203 // At this point we have either completed iterating over the | |
4204 // region we were holding on to, or we have aborted. | |
4205 | |
4206 // We then partially drain the local queue and the global stack. | |
4207 // (Do we really need this?) | |
4208 drain_local_queue(true); | |
4209 drain_global_stack(true); | |
4210 | |
4211 // Read the note on the claim_region() method on why it might | |
4212 // return NULL with potentially more regions available for | |
4213 // claiming and why we have to check out_of_regions() to determine | |
4214 // whether we're done or not. | |
4215 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4216 // We are going to try to claim a new region. We should have | |
4217 // given up on the previous one. | |
1023
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4218 // Separated the asserts so that we know which one fires. |
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|
4219 assert(_curr_region == NULL, "invariant"); |
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|
4220 assert(_finger == NULL, "invariant"); |
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4221 assert(_region_limit == NULL, "invariant"); |
342 | 4222 if (_cm->verbose_low()) |
4223 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); | |
4224 HeapRegion* claimed_region = _cm->claim_region(_task_id); | |
4225 if (claimed_region != NULL) { | |
4226 // Yes, we managed to claim one | |
4227 statsOnly( ++_regions_claimed ); | |
4228 | |
4229 if (_cm->verbose_low()) | |
4230 gclog_or_tty->print_cr("[%d] we successfully claimed " | |
4231 "region "PTR_FORMAT, | |
4232 _task_id, claimed_region); | |
4233 | |
4234 setup_for_region(claimed_region); | |
1023
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|
4235 assert(_curr_region == claimed_region, "invariant"); |
342 | 4236 } |
4237 // It is important to call the regular clock here. It might take | |
4238 // a while to claim a region if, for example, we hit a large | |
4239 // block of empty regions. So we need to call the regular clock | |
4240 // method once round the loop to make sure it's called | |
4241 // frequently enough. | |
4242 regular_clock_call(); | |
4243 } | |
4244 | |
4245 if (!has_aborted() && _curr_region == NULL) { | |
1023
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|
4246 assert(_cm->out_of_regions(), |
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|
4247 "at this point we should be out of regions"); |
342 | 4248 } |
4249 } while ( _curr_region != NULL && !has_aborted()); | |
4250 | |
4251 if (!has_aborted()) { | |
4252 // 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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342
diff
changeset
|
4253 // 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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342
diff
changeset
|
4254 // check if the region stack is empty because if a thread is aborting |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
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diff
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|
4255 // it can push a partially done region back. |
1023
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|
4256 assert(_cm->out_of_regions(), |
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|
4257 "at this point we should be out of regions"); |
342 | 4258 |
4259 if (_cm->verbose_low()) | |
4260 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); | |
4261 | |
4262 // Try to reduce the number of available SATB buffers so that | |
4263 // remark has less work to do. | |
4264 drain_satb_buffers(); | |
4265 } | |
4266 | |
4267 // Since we've done everything else, we can now totally drain the | |
4268 // local queue and global stack. | |
4269 drain_local_queue(false); | |
4270 drain_global_stack(false); | |
4271 | |
4272 // Attempt at work stealing from other task's queues. | |
2174
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|
4273 if (do_stealing && !has_aborted()) { |
342 | 4274 // We have not aborted. This means that we have finished all that |
4275 // we could. Let's try to do some stealing... | |
4276 | |
4277 // 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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parents:
342
diff
changeset
|
4278 // 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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342
diff
changeset
|
4279 // 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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342
diff
changeset
|
4280 // it can push a partially done region back. |
1023
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|
4281 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
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|
4282 "only way to reach here"); |
342 | 4283 |
4284 if (_cm->verbose_low()) | |
4285 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); | |
4286 | |
4287 while (!has_aborted()) { | |
4288 oop obj; | |
4289 statsOnly( ++_steal_attempts ); | |
4290 | |
4291 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
4292 if (_cm->verbose_medium()) | |
4293 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", | |
4294 _task_id, (void*) obj); | |
4295 | |
4296 statsOnly( ++_steals ); | |
4297 | |
1023
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|
4298 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
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|
4299 "any stolen object should be marked"); |
342 | 4300 scan_object(obj); |
4301 | |
4302 // And since we're towards the end, let's totally drain the | |
4303 // local queue and global stack. | |
4304 drain_local_queue(false); | |
4305 drain_global_stack(false); | |
4306 } else { | |
4307 break; | |
4308 } | |
4309 } | |
4310 } | |
4311 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4312 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
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|
4313 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4314 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4315 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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|
4316 _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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|
4317 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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|
4318 } |
cd8e33b2a8ad
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|
4319 } |
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|
4320 |
342 | 4321 // We still haven't aborted. Now, let's try to get into the |
4322 // termination protocol. | |
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|
4323 if (do_termination && !has_aborted()) { |
342 | 4324 // We cannot check whether the global stack is empty, since other |
343
afc1ce1efe66
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iveresov
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342
diff
changeset
|
4325 // tasks might be concurrently pushing objects on it. We also cannot |
afc1ce1efe66
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342
diff
changeset
|
4326 // check if the region stack is empty because if a thread is aborting |
afc1ce1efe66
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diff
changeset
|
4327 // it can push a partially done region back. |
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|
4328 // Separated the asserts so that we know which one fires. |
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|
4329 assert(_cm->out_of_regions(), "only way to reach here"); |
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|
4330 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4331 |
4332 if (_cm->verbose_low()) | |
4333 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); | |
4334 | |
4335 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
4336 // The CMTask class also extends the TerminatorTerminator class, | |
4337 // hence its should_exit_termination() method will also decide | |
4338 // whether to exit the termination protocol or not. | |
4339 bool finished = _cm->terminator()->offer_termination(this); | |
4340 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
4341 _termination_time_ms += | |
4342 termination_end_time_ms - _termination_start_time_ms; | |
4343 | |
4344 if (finished) { | |
4345 // We're all done. | |
4346 | |
4347 if (_task_id == 0) { | |
4348 // let's allow task 0 to do this | |
4349 if (concurrent()) { | |
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|
4350 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4351 // we need to set this to false before the next |
4352 // safepoint. This way we ensure that the marking phase | |
4353 // doesn't observe any more heap expansions. | |
4354 _cm->clear_concurrent_marking_in_progress(); | |
4355 } | |
4356 } | |
4357 | |
4358 // We can now guarantee that the global stack is empty, since | |
1023
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4359 // all other tasks have finished. We separated the guarantees so |
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4360 // that, if a condition is false, we can immediately find out |
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|
4361 // which one. |
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|
4362 guarantee(_cm->out_of_regions(), "only way to reach here"); |
1835
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4363 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
1023
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4364 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
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4365 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
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4366 guarantee(_task_queue->size() == 0, "only way to reach here"); |
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4367 guarantee(!_cm->has_overflown(), "only way to reach here"); |
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4368 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
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4369 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
342 | 4370 |
4371 if (_cm->verbose_low()) | |
4372 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); | |
4373 } else { | |
4374 // Apparently there's more work to do. Let's abort this task. It | |
4375 // will restart it and we can hopefully find more things to do. | |
4376 | |
4377 if (_cm->verbose_low()) | |
4378 gclog_or_tty->print_cr("[%d] apparently there is more work to do", _task_id); | |
4379 | |
4380 set_has_aborted(); | |
4381 statsOnly( ++_aborted_termination ); | |
4382 } | |
4383 } | |
4384 | |
4385 // Mainly for debugging purposes to make sure that a pointer to the | |
4386 // closure which was statically allocated in this frame doesn't | |
4387 // escape it by accident. | |
3771 | 4388 set_cm_oop_closure(NULL); |
342 | 4389 double end_time_ms = os::elapsedVTime() * 1000.0; |
4390 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4391 // Update the step history. | |
4392 _step_times_ms.add(elapsed_time_ms); | |
4393 | |
4394 if (has_aborted()) { | |
4395 // The task was aborted for some reason. | |
4396 | |
4397 statsOnly( ++_aborted ); | |
4398 | |
2174
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4399 if (_has_timed_out) { |
342 | 4400 double diff_ms = elapsed_time_ms - _time_target_ms; |
4401 // Keep statistics of how well we did with respect to hitting | |
4402 // our target only if we actually timed out (if we aborted for | |
4403 // other reasons, then the results might get skewed). | |
4404 _marking_step_diffs_ms.add(diff_ms); | |
4405 } | |
4406 | |
4407 if (_cm->has_overflown()) { | |
4408 // This is the interesting one. We aborted because a global | |
4409 // overflow was raised. This means we have to restart the | |
4410 // marking phase and start iterating over regions. However, in | |
4411 // order to do this we have to make sure that all tasks stop | |
4412 // what they are doing and re-initialise in a safe manner. We | |
4413 // will achieve this with the use of two barrier sync points. | |
4414 | |
4415 if (_cm->verbose_low()) | |
4416 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); | |
4417 | |
4418 _cm->enter_first_sync_barrier(_task_id); | |
4419 // When we exit this sync barrier we know that all tasks have | |
4420 // stopped doing marking work. So, it's now safe to | |
4421 // re-initialise our data structures. At the end of this method, | |
4422 // task 0 will clear the global data structures. | |
4423 | |
4424 statsOnly( ++_aborted_overflow ); | |
4425 | |
4426 // We clear the local state of this task... | |
4427 clear_region_fields(); | |
4428 | |
4429 // ...and enter the second barrier. | |
4430 _cm->enter_second_sync_barrier(_task_id); | |
4431 // At this point everything has bee re-initialised and we're | |
4432 // ready to restart. | |
4433 } | |
4434 | |
4435 if (_cm->verbose_low()) { | |
4436 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
4437 "elapsed = %1.2lfms <<<<<<<<<<", | |
4438 _task_id, _time_target_ms, elapsed_time_ms); | |
4439 if (_cm->has_aborted()) | |
4440 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", | |
4441 _task_id); | |
4442 } | |
4443 } else { | |
4444 if (_cm->verbose_low()) | |
4445 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " | |
4446 "elapsed = %1.2lfms <<<<<<<<<<", | |
4447 _task_id, _time_target_ms, elapsed_time_ms); | |
4448 } | |
4449 | |
4450 _claimed = false; | |
4451 } | |
4452 | |
4453 CMTask::CMTask(int task_id, | |
4454 ConcurrentMark* cm, | |
4455 CMTaskQueue* task_queue, | |
4456 CMTaskQueueSet* task_queues) | |
4457 : _g1h(G1CollectedHeap::heap()), | |
4458 _task_id(task_id), _cm(cm), | |
4459 _claimed(false), | |
4460 _nextMarkBitMap(NULL), _hash_seed(17), | |
4461 _task_queue(task_queue), | |
4462 _task_queues(task_queues), | |
3771 | 4463 _cm_oop_closure(NULL), |
1835
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4464 _aborted_region(MemRegion()) { |
1023
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|
4465 guarantee(task_queue != NULL, "invariant"); |
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4466 guarantee(task_queues != NULL, "invariant"); |
342 | 4467 |
4468 statsOnly( _clock_due_to_scanning = 0; | |
4469 _clock_due_to_marking = 0 ); | |
4470 | |
4471 _marking_step_diffs_ms.add(0.5); | |
4472 } | |
2435
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4473 |
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4474 // These are formatting macros that are used below to ensure |
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4475 // consistent formatting. The *_H_* versions are used to format the |
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4476 // header for a particular value and they should be kept consistent |
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4477 // with the corresponding macro. Also note that most of the macros add |
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4478 // the necessary white space (as a prefix) which makes them a bit |
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|
4479 // easier to compose. |
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|
4480 |
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|
4481 // All the output lines are prefixed with this string to be able to |
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|
4482 // identify them easily in a large log file. |
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4483 #define G1PPRL_LINE_PREFIX "###" |
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4484 |
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4485 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
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4486 #ifdef _LP64 |
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4487 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
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4488 #else // _LP64 |
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4489 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
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4490 #endif // _LP64 |
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4491 |
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|
4492 // For per-region info |
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|
4493 #define G1PPRL_TYPE_FORMAT " %-4s" |
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4494 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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4495 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
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4496 #define G1PPRL_BYTE_H_FORMAT " %9s" |
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4497 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
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4498 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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|
4499 |
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|
4500 // For summary info |
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|
4501 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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4502 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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4503 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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4504 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4505 |
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|
4506 G1PrintRegionLivenessInfoClosure:: |
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4507 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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4508 : _out(out), |
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4509 _total_used_bytes(0), _total_capacity_bytes(0), |
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4510 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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4511 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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|
4512 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
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4513 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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4514 MemRegion g1_committed = g1h->g1_committed(); |
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4515 MemRegion g1_reserved = g1h->g1_reserved(); |
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4516 double now = os::elapsedTime(); |
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|
4517 |
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|
4518 // Print the header of the output. |
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|
4519 _out->cr(); |
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4520 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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4521 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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4522 G1PPRL_SUM_ADDR_FORMAT("committed") |
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4523 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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4524 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
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4525 g1_committed.start(), g1_committed.end(), |
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|
4526 g1_reserved.start(), g1_reserved.end(), |
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4527 HeapRegion::GrainBytes); |
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4528 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4529 _out->print_cr(G1PPRL_LINE_PREFIX |
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4530 G1PPRL_TYPE_H_FORMAT |
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4531 G1PPRL_ADDR_BASE_H_FORMAT |
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4532 G1PPRL_BYTE_H_FORMAT |
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4533 G1PPRL_BYTE_H_FORMAT |
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4534 G1PPRL_BYTE_H_FORMAT |
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4535 G1PPRL_DOUBLE_H_FORMAT, |
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4536 "type", "address-range", |
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|
4537 "used", "prev-live", "next-live", "gc-eff"); |
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|
4538 } |
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|
4539 |
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4540 // It takes as a parameter a reference to one of the _hum_* fields, it |
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4541 // deduces the corresponding value for a region in a humongous region |
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4542 // series (either the region size, or what's left if the _hum_* field |
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4543 // is < the region size), and updates the _hum_* field accordingly. |
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4544 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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4545 size_t bytes = 0; |
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4546 // The > 0 check is to deal with the prev and next live bytes which |
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4547 // could be 0. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4548 if (*hum_bytes > 0) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4549 bytes = MIN2((size_t) HeapRegion::GrainBytes, *hum_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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|
4550 *hum_bytes -= 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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|
4551 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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|
4552 return bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4553 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4554 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4555 // It deduces the values for a region in a humongous region series |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4556 // from the _hum_* fields and updates those accordingly. It assumes |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4557 // that that _hum_* fields have already been set up from the "starts |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4558 // humongous" region and we visit the regions in address order. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4559 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4560 size_t* capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4561 size_t* prev_live_bytes, |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4562 size_t* next_live_bytes) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4563 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4564 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4565 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4566 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4567 *next_live_bytes = get_hum_bytes(&_hum_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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|
4568 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4569 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4570 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4571 const char* type = ""; |
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|
4572 HeapWord* bottom = r->bottom(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4573 HeapWord* end = r->end(); |
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|
4574 size_t capacity_bytes = r->capacity(); |
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|
4575 size_t used_bytes = r->used(); |
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|
4576 size_t prev_live_bytes = r->live_bytes(); |
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|
4577 size_t next_live_bytes = r->next_live_bytes(); |
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|
4578 double gc_eff = r->gc_efficiency(); |
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|
4579 if (r->used() == 0) { |
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|
4580 type = "FREE"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4581 } else if (r->is_survivor()) { |
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|
4582 type = "SURV"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4583 } else if (r->is_young()) { |
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|
4584 type = "EDEN"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4585 } else if (r->startsHumongous()) { |
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diff
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|
4586 type = "HUMS"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4587 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4588 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4589 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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|
4590 "they should have been zeroed after the last time we used them"); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
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|
4591 // Set up the _hum_* fields. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4592 _hum_capacity_bytes = capacity_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4593 _hum_used_bytes = used_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4594 _hum_prev_live_bytes = prev_live_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4595 _hum_next_live_bytes = 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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diff
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|
4596 get_hum_bytes(&used_bytes, &capacity_bytes, |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4597 &prev_live_bytes, &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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|
4598 end = bottom + HeapRegion::GrainWords; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4599 } else if (r->continuesHumongous()) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4600 type = "HUMC"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4601 get_hum_bytes(&used_bytes, &capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4602 &prev_live_bytes, &next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
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|
4603 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4604 } else { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4605 type = "OLD"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4606 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4607 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4608 _total_used_bytes += used_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4609 _total_capacity_bytes += capacity_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
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|
4610 _total_prev_live_bytes += prev_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4611 _total_next_live_bytes += 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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diff
changeset
|
4612 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4613 // Print a line for this particular region. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4614 _out->print_cr(G1PPRL_LINE_PREFIX |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4615 G1PPRL_TYPE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4616 G1PPRL_ADDR_BASE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4617 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4618 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4619 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4620 G1PPRL_DOUBLE_FORMAT, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4621 type, bottom, end, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4622 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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diff
changeset
|
4623 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4624 return false; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4625 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4626 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4627 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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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|
4628 // Print the footer of the output. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4629 _out->print_cr(G1PPRL_LINE_PREFIX); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4630 _out->print_cr(G1PPRL_LINE_PREFIX |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4631 " SUMMARY" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4632 G1PPRL_SUM_MB_FORMAT("capacity") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4633 G1PPRL_SUM_MB_PERC_FORMAT("used") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4634 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4635 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4636 bytes_to_mb(_total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4637 bytes_to_mb(_total_used_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4638 perc(_total_used_bytes, _total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4639 bytes_to_mb(_total_prev_live_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4640 perc(_total_prev_live_bytes, _total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4641 bytes_to_mb(_total_next_live_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4642 perc(_total_next_live_bytes, _total_capacity_bytes)); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4643 _out->cr(); |
371bbc844bf1
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diff
changeset
|
4644 } |