Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 6008:b632e80fc9dc
4988100: oop_verify_old_oop appears to be dead
Summary: removed oop_verify_old_oop and allow_dirty. Also reviewed by: alexlamsl@gmail.com
Reviewed-by: jmasa, jwilhelm
author | brutisso |
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date | Mon, 16 Apr 2012 08:57:18 +0200 |
parents | 5c86f8211d1e |
children | 720b6a76dd9d |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1Log.hpp" |
3771 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 34 #include "gc_implementation/g1/g1RemSet.hpp" |
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35 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
37 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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38 #include "gc_implementation/shared/vmGCOperations.hpp" |
1972 | 39 #include "memory/genOopClosures.inline.hpp" |
40 #include "memory/referencePolicy.hpp" | |
41 #include "memory/resourceArea.hpp" | |
42 #include "oops/oop.inline.hpp" | |
43 #include "runtime/handles.inline.hpp" | |
44 #include "runtime/java.hpp" | |
342 | 45 |
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46 // Concurrent marking bit map wrapper |
342 | 47 |
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48 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
342 | 49 _bm((uintptr_t*)NULL,0), |
50 _shifter(shifter) { | |
51 _bmStartWord = (HeapWord*)(rs.base()); | |
52 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
53 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
54 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
55 | |
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56 guarantee(brs.is_reserved(), "couldn't allocate concurrent marking bit map"); |
342 | 57 // For now we'll just commit all of the bit map up fromt. |
58 // Later on we'll try to be more parsimonious with swap. | |
59 guarantee(_virtual_space.initialize(brs, brs.size()), | |
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60 "couldn't reseve backing store for concurrent marking bit map"); |
342 | 61 assert(_virtual_space.committed_size() == brs.size(), |
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62 "didn't reserve backing store for all of concurrent marking bit map?"); |
342 | 63 _bm.set_map((uintptr_t*)_virtual_space.low()); |
64 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
65 _bmWordSize, "inconsistency in bit map sizing"); | |
66 _bm.set_size(_bmWordSize >> _shifter); | |
67 } | |
68 | |
69 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
70 HeapWord* limit) const { | |
71 // First we must round addr *up* to a possible object boundary. | |
72 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
73 HeapWordSize << _shifter); | |
74 size_t addrOffset = heapWordToOffset(addr); | |
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75 if (limit == NULL) { |
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76 limit = _bmStartWord + _bmWordSize; |
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77 } |
342 | 78 size_t limitOffset = heapWordToOffset(limit); |
79 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
80 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
81 assert(nextAddr >= addr, "get_next_one postcondition"); | |
82 assert(nextAddr == limit || isMarked(nextAddr), | |
83 "get_next_one postcondition"); | |
84 return nextAddr; | |
85 } | |
86 | |
87 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
88 HeapWord* limit) const { | |
89 size_t addrOffset = heapWordToOffset(addr); | |
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90 if (limit == NULL) { |
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91 limit = _bmStartWord + _bmWordSize; |
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92 } |
342 | 93 size_t limitOffset = heapWordToOffset(limit); |
94 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
95 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
96 assert(nextAddr >= addr, "get_next_one postcondition"); | |
97 assert(nextAddr == limit || !isMarked(nextAddr), | |
98 "get_next_one postcondition"); | |
99 return nextAddr; | |
100 } | |
101 | |
102 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
103 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
104 return (int) (diff >> _shifter); | |
105 } | |
106 | |
107 #ifndef PRODUCT | |
108 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
109 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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110 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
342 | 111 "size inconsistency"); |
112 return _bmStartWord == (HeapWord*)(rs.base()) && | |
113 _bmWordSize == rs.size()>>LogHeapWordSize; | |
114 } | |
115 #endif | |
116 | |
117 void CMBitMap::clearAll() { | |
118 _bm.clear(); | |
119 return; | |
120 } | |
121 | |
122 void CMBitMap::markRange(MemRegion mr) { | |
123 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
124 assert(!mr.is_empty(), "unexpected empty region"); | |
125 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
126 ((HeapWord *) mr.end())), | |
127 "markRange memory region end is not card aligned"); | |
128 // convert address range into offset range | |
129 _bm.at_put_range(heapWordToOffset(mr.start()), | |
130 heapWordToOffset(mr.end()), true); | |
131 } | |
132 | |
133 void CMBitMap::clearRange(MemRegion mr) { | |
134 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
135 assert(!mr.is_empty(), "unexpected empty region"); | |
136 // convert address range into offset range | |
137 _bm.at_put_range(heapWordToOffset(mr.start()), | |
138 heapWordToOffset(mr.end()), false); | |
139 } | |
140 | |
141 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
142 HeapWord* end_addr) { | |
143 HeapWord* start = getNextMarkedWordAddress(addr); | |
144 start = MIN2(start, end_addr); | |
145 HeapWord* end = getNextUnmarkedWordAddress(start); | |
146 end = MIN2(end, end_addr); | |
147 assert(start <= end, "Consistency check"); | |
148 MemRegion mr(start, end); | |
149 if (!mr.is_empty()) { | |
150 clearRange(mr); | |
151 } | |
152 return mr; | |
153 } | |
154 | |
155 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
156 _base(NULL), _cm(cm) | |
157 #ifdef ASSERT | |
158 , _drain_in_progress(false) | |
159 , _drain_in_progress_yields(false) | |
160 #endif | |
161 {} | |
162 | |
163 void CMMarkStack::allocate(size_t size) { | |
164 _base = NEW_C_HEAP_ARRAY(oop, size); | |
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165 if (_base == NULL) { |
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166 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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167 } |
342 | 168 _index = 0; |
169 _capacity = (jint) size; | |
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170 _saved_index = -1; |
342 | 171 NOT_PRODUCT(_max_depth = 0); |
172 } | |
173 | |
174 CMMarkStack::~CMMarkStack() { | |
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175 if (_base != NULL) { |
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176 FREE_C_HEAP_ARRAY(oop, _base); |
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177 } |
342 | 178 } |
179 | |
180 void CMMarkStack::par_push(oop ptr) { | |
181 while (true) { | |
182 if (isFull()) { | |
183 _overflow = true; | |
184 return; | |
185 } | |
186 // Otherwise... | |
187 jint index = _index; | |
188 jint next_index = index+1; | |
189 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
190 if (res == index) { | |
191 _base[index] = ptr; | |
192 // Note that we don't maintain this atomically. We could, but it | |
193 // doesn't seem necessary. | |
194 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
195 return; | |
196 } | |
197 // Otherwise, we need to try again. | |
198 } | |
199 } | |
200 | |
201 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
202 while (true) { | |
203 if (isFull()) { | |
204 _overflow = true; | |
205 return; | |
206 } | |
207 // Otherwise... | |
208 jint index = _index; | |
209 jint next_index = index + n; | |
210 if (next_index > _capacity) { | |
211 _overflow = true; | |
212 return; | |
213 } | |
214 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
215 if (res == index) { | |
216 for (int i = 0; i < n; i++) { | |
217 int ind = index + i; | |
218 assert(ind < _capacity, "By overflow test above."); | |
219 _base[ind] = ptr_arr[i]; | |
220 } | |
221 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
222 return; | |
223 } | |
224 // Otherwise, we need to try again. | |
225 } | |
226 } | |
227 | |
228 | |
229 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
230 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
231 jint start = _index; | |
232 jint next_index = start + n; | |
233 if (next_index > _capacity) { | |
234 _overflow = true; | |
235 return; | |
236 } | |
237 // Otherwise. | |
238 _index = next_index; | |
239 for (int i = 0; i < n; i++) { | |
240 int ind = start + i; | |
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241 assert(ind < _capacity, "By overflow test above."); |
342 | 242 _base[ind] = ptr_arr[i]; |
243 } | |
244 } | |
245 | |
246 | |
247 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
248 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
249 jint index = _index; | |
250 if (index == 0) { | |
251 *n = 0; | |
252 return false; | |
253 } else { | |
254 int k = MIN2(max, index); | |
255 jint new_ind = index - k; | |
256 for (int j = 0; j < k; j++) { | |
257 ptr_arr[j] = _base[new_ind + j]; | |
258 } | |
259 _index = new_ind; | |
260 *n = k; | |
261 return true; | |
262 } | |
263 } | |
264 | |
265 template<class OopClosureClass> | |
266 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
267 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
268 || SafepointSynchronize::is_at_safepoint(), | |
269 "Drain recursion must be yield-safe."); | |
270 bool res = true; | |
271 debug_only(_drain_in_progress = true); | |
272 debug_only(_drain_in_progress_yields = yield_after); | |
273 while (!isEmpty()) { | |
274 oop newOop = pop(); | |
275 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
276 assert(newOop->is_oop(), "Expected an oop"); | |
277 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
278 "only grey objects on this stack"); | |
279 newOop->oop_iterate(cl); | |
280 if (yield_after && _cm->do_yield_check()) { | |
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281 res = false; |
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282 break; |
342 | 283 } |
284 } | |
285 debug_only(_drain_in_progress = false); | |
286 return res; | |
287 } | |
288 | |
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289 void CMMarkStack::note_start_of_gc() { |
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290 assert(_saved_index == -1, |
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291 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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292 _saved_index = _index; |
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293 } |
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294 |
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295 void CMMarkStack::note_end_of_gc() { |
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296 // This is intentionally a guarantee, instead of an assert. If we |
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297 // accidentally add something to the mark stack during GC, it |
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298 // will be a correctness issue so it's better if we crash. we'll |
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299 // only check this once per GC anyway, so it won't be a performance |
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300 // issue in any way. |
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301 guarantee(_saved_index == _index, |
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302 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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303 _saved_index = -1; |
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304 } |
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305 |
342 | 306 void CMMarkStack::oops_do(OopClosure* f) { |
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307 assert(_saved_index == _index, |
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308 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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309 for (int i = 0; i < _index; i += 1) { |
342 | 310 f->do_oop(&_base[i]); |
311 } | |
312 } | |
313 | |
314 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
315 return (_g1h->is_obj_ill(obj) | |
316 || (_g1h->is_in_permanent(obj) | |
317 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
318 } | |
319 | |
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320 CMRootRegions::CMRootRegions() : |
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321 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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322 _should_abort(false), _next_survivor(NULL) { } |
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323 |
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324 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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325 _young_list = g1h->young_list(); |
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326 _cm = cm; |
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327 } |
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328 |
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329 void CMRootRegions::prepare_for_scan() { |
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330 assert(!scan_in_progress(), "pre-condition"); |
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331 |
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332 // Currently, only survivors can be root regions. |
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333 assert(_next_survivor == NULL, "pre-condition"); |
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334 _next_survivor = _young_list->first_survivor_region(); |
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335 _scan_in_progress = (_next_survivor != NULL); |
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336 _should_abort = false; |
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337 } |
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338 |
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339 HeapRegion* CMRootRegions::claim_next() { |
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340 if (_should_abort) { |
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341 // If someone has set the should_abort flag, we return NULL to |
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342 // force the caller to bail out of their loop. |
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343 return NULL; |
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344 } |
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345 |
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346 // Currently, only survivors can be root regions. |
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347 HeapRegion* res = _next_survivor; |
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348 if (res != NULL) { |
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349 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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350 // Read it again in case it changed while we were waiting for the lock. |
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351 res = _next_survivor; |
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352 if (res != NULL) { |
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353 if (res == _young_list->last_survivor_region()) { |
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354 // We just claimed the last survivor so store NULL to indicate |
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355 // that we're done. |
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356 _next_survivor = NULL; |
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357 } else { |
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358 _next_survivor = res->get_next_young_region(); |
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359 } |
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360 } else { |
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361 // Someone else claimed the last survivor while we were trying |
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362 // to take the lock so nothing else to do. |
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363 } |
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364 } |
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365 assert(res == NULL || res->is_survivor(), "post-condition"); |
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366 |
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367 return res; |
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368 } |
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369 |
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370 void CMRootRegions::scan_finished() { |
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371 assert(scan_in_progress(), "pre-condition"); |
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372 |
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373 // Currently, only survivors can be root regions. |
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374 if (!_should_abort) { |
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375 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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376 } |
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377 _next_survivor = NULL; |
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378 |
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379 { |
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380 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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381 _scan_in_progress = false; |
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382 RootRegionScan_lock->notify_all(); |
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383 } |
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384 } |
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385 |
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386 bool CMRootRegions::wait_until_scan_finished() { |
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387 if (!scan_in_progress()) return false; |
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388 |
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389 { |
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390 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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391 while (scan_in_progress()) { |
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392 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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393 } |
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394 } |
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395 return true; |
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396 } |
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397 |
342 | 398 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
399 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
400 #endif // _MSC_VER | |
401 | |
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402 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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403 return MAX2((n_par_threads + 2) / 4, 1U); |
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404 } |
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405 |
342 | 406 ConcurrentMark::ConcurrentMark(ReservedSpace rs, |
407 int max_regions) : | |
408 _markBitMap1(rs, MinObjAlignment - 1), | |
409 _markBitMap2(rs, MinObjAlignment - 1), | |
410 | |
411 _parallel_marking_threads(0), | |
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412 _max_parallel_marking_threads(0), |
342 | 413 _sleep_factor(0.0), |
414 _marking_task_overhead(1.0), | |
415 _cleanup_sleep_factor(0.0), | |
416 _cleanup_task_overhead(1.0), | |
2152 | 417 _cleanup_list("Cleanup List"), |
342 | 418 _region_bm(max_regions, false /* in_resource_area*/), |
419 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
420 CardTableModRefBS::card_shift, | |
421 false /* in_resource_area*/), | |
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422 |
342 | 423 _prevMarkBitMap(&_markBitMap1), |
424 _nextMarkBitMap(&_markBitMap2), | |
425 | |
426 _markStack(this), | |
427 // _finger set in set_non_marking_state | |
428 | |
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429 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 430 // _active_tasks set in set_non_marking_state |
431 // _tasks set inside the constructor | |
432 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
433 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
434 | |
435 _has_overflown(false), | |
436 _concurrent(false), | |
619
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437 _has_aborted(false), |
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438 _restart_for_overflow(false), |
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439 _concurrent_marking_in_progress(false), |
342 | 440 |
441 // _verbose_level set below | |
442 | |
443 _init_times(), | |
444 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
445 _cleanup_times(), | |
446 _total_counting_time(0.0), | |
447 _total_rs_scrub_time(0.0), | |
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448 |
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449 _parallel_workers(NULL), |
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450 |
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451 _count_card_bitmaps(NULL), |
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452 _count_marked_bytes(NULL) { |
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453 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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454 if (verbose_level < no_verbose) { |
342 | 455 verbose_level = no_verbose; |
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456 } |
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457 if (verbose_level > high_verbose) { |
342 | 458 verbose_level = high_verbose; |
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459 } |
342 | 460 _verbose_level = verbose_level; |
461 | |
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462 if (verbose_low()) { |
342 | 463 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
464 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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465 } |
342 | 466 |
1284 | 467 _markStack.allocate(MarkStackSize); |
342 | 468 |
469 // Create & start a ConcurrentMark thread. | |
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470 _cmThread = new ConcurrentMarkThread(this); |
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471 assert(cmThread() != NULL, "CM Thread should have been created"); |
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472 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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473 |
342 | 474 _g1h = G1CollectedHeap::heap(); |
475 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
476 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
477 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
478 | |
479 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 480 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 481 |
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482 _root_regions.init(_g1h, this); |
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483 |
342 | 484 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); |
485 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
486 | |
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487 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_task_num); |
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488 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_task_num); |
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489 |
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490 BitMap::idx_t card_bm_size = _card_bm.size(); |
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491 |
342 | 492 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
493 _active_tasks = _max_task_num; | |
494 for (int i = 0; i < (int) _max_task_num; ++i) { | |
495 CMTaskQueue* task_queue = new CMTaskQueue(); | |
496 task_queue->initialize(); | |
497 _task_queues->register_queue(i, task_queue); | |
498 | |
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499 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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500 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions); |
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501 |
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502 _tasks[i] = new CMTask(i, this, |
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503 _count_marked_bytes[i], |
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504 &_count_card_bitmaps[i], |
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505 task_queue, _task_queues); |
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506 |
342 | 507 _accum_task_vtime[i] = 0.0; |
508 } | |
509 | |
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510 // Calculate the card number for the bottom of the heap. Used |
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511 // in biasing indexes into the accounting card bitmaps. |
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512 _heap_bottom_card_num = |
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513 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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514 CardTableModRefBS::card_shift); |
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515 |
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516 // Clear all the liveness counting data |
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517 clear_all_count_data(); |
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518 |
1284 | 519 if (ConcGCThreads > ParallelGCThreads) { |
520 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
342 | 521 "than ParallelGCThreads."); |
522 } | |
523 if (ParallelGCThreads == 0) { | |
524 // if we are not running with any parallel GC threads we will not | |
525 // spawn any marking threads either | |
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526 _parallel_marking_threads = 0; |
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527 _max_parallel_marking_threads = 0; |
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528 _sleep_factor = 0.0; |
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529 _marking_task_overhead = 1.0; |
342 | 530 } else { |
1284 | 531 if (ConcGCThreads > 0) { |
532 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
342 | 533 // if both are set |
534 | |
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535 _parallel_marking_threads = (uint) ConcGCThreads; |
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536 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 537 _sleep_factor = 0.0; |
538 _marking_task_overhead = 1.0; | |
751 | 539 } else if (G1MarkingOverheadPercent > 0) { |
342 | 540 // we will calculate the number of parallel marking threads |
541 // based on a target overhead with respect to the soft real-time | |
542 // goal | |
543 | |
751 | 544 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 545 double overall_cm_overhead = |
751 | 546 (double) MaxGCPauseMillis * marking_overhead / |
547 (double) GCPauseIntervalMillis; | |
342 | 548 double cpu_ratio = 1.0 / (double) os::processor_count(); |
549 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
550 double marking_task_overhead = | |
551 overall_cm_overhead / marking_thread_num * | |
552 (double) os::processor_count(); | |
553 double sleep_factor = | |
554 (1.0 - marking_task_overhead) / marking_task_overhead; | |
555 | |
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556 _parallel_marking_threads = (uint) marking_thread_num; |
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557 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 558 _sleep_factor = sleep_factor; |
559 _marking_task_overhead = marking_task_overhead; | |
560 } else { | |
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561 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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562 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 563 _sleep_factor = 0.0; |
564 _marking_task_overhead = 1.0; | |
565 } | |
566 | |
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567 if (parallel_marking_threads() > 1) { |
342 | 568 _cleanup_task_overhead = 1.0; |
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569 } else { |
342 | 570 _cleanup_task_overhead = marking_task_overhead(); |
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571 } |
342 | 572 _cleanup_sleep_factor = |
573 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
574 | |
575 #if 0 | |
576 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
577 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
578 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
579 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
580 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
581 #endif | |
582 | |
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583 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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584 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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585 _max_parallel_marking_threads, false, true); |
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586 if (_parallel_workers == NULL) { |
342 | 587 vm_exit_during_initialization("Failed necessary allocation."); |
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588 } else { |
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589 _parallel_workers->initialize_workers(); |
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590 } |
342 | 591 } |
592 | |
593 // so that the call below can read a sensible value | |
594 _heap_start = (HeapWord*) rs.base(); | |
595 set_non_marking_state(); | |
596 } | |
597 | |
598 void ConcurrentMark::update_g1_committed(bool force) { | |
599 // If concurrent marking is not in progress, then we do not need to | |
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600 // update _heap_end. |
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601 if (!concurrent_marking_in_progress() && !force) return; |
342 | 602 |
603 MemRegion committed = _g1h->g1_committed(); | |
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604 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 605 HeapWord* new_end = committed.end(); |
606 if (new_end > _heap_end) { | |
607 // The heap has been expanded. | |
608 | |
609 _heap_end = new_end; | |
610 } | |
611 // Notice that the heap can also shrink. However, this only happens | |
612 // during a Full GC (at least currently) and the entire marking | |
613 // phase will bail out and the task will not be restarted. So, let's | |
614 // do nothing. | |
615 } | |
616 | |
617 void ConcurrentMark::reset() { | |
618 // Starting values for these two. This should be called in a STW | |
619 // phase. CM will be notified of any future g1_committed expansions | |
620 // will be at the end of evacuation pauses, when tasks are | |
621 // inactive. | |
622 MemRegion committed = _g1h->g1_committed(); | |
623 _heap_start = committed.start(); | |
624 _heap_end = committed.end(); | |
625 | |
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626 // Separated the asserts so that we know which one fires. |
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627 assert(_heap_start != NULL, "heap bounds should look ok"); |
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628 assert(_heap_end != NULL, "heap bounds should look ok"); |
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629 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 630 |
631 // reset all the marking data structures and any necessary flags | |
632 clear_marking_state(); | |
633 | |
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634 if (verbose_low()) { |
342 | 635 gclog_or_tty->print_cr("[global] resetting"); |
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636 } |
342 | 637 |
638 // We do reset all of them, since different phases will use | |
639 // different number of active threads. So, it's easiest to have all | |
640 // of them ready. | |
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641 for (int i = 0; i < (int) _max_task_num; ++i) { |
342 | 642 _tasks[i]->reset(_nextMarkBitMap); |
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643 } |
342 | 644 |
645 // we need this to make sure that the flag is on during the evac | |
646 // pause with initial mark piggy-backed | |
647 set_concurrent_marking_in_progress(); | |
648 } | |
649 | |
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650 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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651 assert(active_tasks <= _max_task_num, "we should not have more"); |
342 | 652 |
653 _active_tasks = active_tasks; | |
654 // Need to update the three data structures below according to the | |
655 // number of active threads for this phase. | |
656 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
657 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
658 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
659 | |
660 _concurrent = concurrent; | |
661 // We propagate this to all tasks, not just the active ones. | |
662 for (int i = 0; i < (int) _max_task_num; ++i) | |
663 _tasks[i]->set_concurrent(concurrent); | |
664 | |
665 if (concurrent) { | |
666 set_concurrent_marking_in_progress(); | |
667 } else { | |
668 // We currently assume that the concurrent flag has been set to | |
669 // false before we start remark. At this point we should also be | |
670 // in a STW phase. | |
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671 assert(!concurrent_marking_in_progress(), "invariant"); |
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672 assert(_finger == _heap_end, "only way to get here"); |
342 | 673 update_g1_committed(true); |
674 } | |
675 } | |
676 | |
677 void ConcurrentMark::set_non_marking_state() { | |
678 // We set the global marking state to some default values when we're | |
679 // not doing marking. | |
680 clear_marking_state(); | |
681 _active_tasks = 0; | |
682 clear_concurrent_marking_in_progress(); | |
683 } | |
684 | |
685 ConcurrentMark::~ConcurrentMark() { | |
4735 | 686 // The ConcurrentMark instance is never freed. |
687 ShouldNotReachHere(); | |
342 | 688 } |
689 | |
690 void ConcurrentMark::clearNextBitmap() { | |
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691 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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692 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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693 |
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694 // Make sure that the concurrent mark thread looks to still be in |
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695 // the current cycle. |
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696 guarantee(cmThread()->during_cycle(), "invariant"); |
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697 |
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698 // We are finishing up the current cycle by clearing the next |
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699 // marking bitmap and getting it ready for the next cycle. During |
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700 // this time no other cycle can start. So, let's make sure that this |
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701 // is the case. |
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702 guarantee(!g1h->mark_in_progress(), "invariant"); |
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703 |
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704 // clear the mark bitmap (no grey objects to start with). |
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705 // We need to do this in chunks and offer to yield in between |
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706 // each chunk. |
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707 HeapWord* start = _nextMarkBitMap->startWord(); |
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708 HeapWord* end = _nextMarkBitMap->endWord(); |
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709 HeapWord* cur = start; |
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710 size_t chunkSize = M; |
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711 while (cur < end) { |
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712 HeapWord* next = cur + chunkSize; |
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713 if (next > end) { |
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714 next = end; |
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715 } |
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716 MemRegion mr(cur,next); |
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717 _nextMarkBitMap->clearRange(mr); |
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718 cur = next; |
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719 do_yield_check(); |
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720 |
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721 // Repeat the asserts from above. We'll do them as asserts here to |
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722 // minimize their overhead on the product. However, we'll have |
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723 // them as guarantees at the beginning / end of the bitmap |
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724 // clearing to get some checking in the product. |
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725 assert(cmThread()->during_cycle(), "invariant"); |
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726 assert(!g1h->mark_in_progress(), "invariant"); |
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727 } |
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728 |
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729 // Clear the liveness counting data |
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730 clear_all_count_data(); |
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731 |
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732 // Repeat the asserts from above. |
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733 guarantee(cmThread()->during_cycle(), "invariant"); |
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734 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 735 } |
736 | |
737 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
738 public: | |
739 bool doHeapRegion(HeapRegion* r) { | |
740 if (!r->continuesHumongous()) { | |
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741 r->note_start_of_marking(); |
342 | 742 } |
743 return false; | |
744 } | |
745 }; | |
746 | |
747 void ConcurrentMark::checkpointRootsInitialPre() { | |
748 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
749 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
750 | |
751 _has_aborted = false; | |
752 | |
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753 #ifndef PRODUCT |
1044 | 754 if (G1PrintReachableAtInitialMark) { |
1388 | 755 print_reachable("at-cycle-start", |
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756 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 757 } |
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758 #endif |
342 | 759 |
760 // Initialise marking structures. This has to be done in a STW phase. | |
761 reset(); | |
4787
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762 |
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763 // For each region note start of marking. |
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764 NoteStartOfMarkHRClosure startcl; |
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765 g1h->heap_region_iterate(&startcl); |
342 | 766 } |
767 | |
768 | |
769 void ConcurrentMark::checkpointRootsInitialPost() { | |
770 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
771 | |
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772 // If we force an overflow during remark, the remark operation will |
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773 // actually abort and we'll restart concurrent marking. If we always |
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774 // force an oveflow during remark we'll never actually complete the |
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775 // marking phase. So, we initilize this here, at the start of the |
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776 // cycle, so that at the remaining overflow number will decrease at |
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777 // every remark and we'll eventually not need to cause one. |
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778 force_overflow_stw()->init(); |
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779 |
3979
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780 // Start Concurrent Marking weak-reference discovery. |
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781 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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782 // enable ("weak") refs discovery |
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783 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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784 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 785 |
786 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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787 // This is the start of the marking cycle, we're expected all |
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788 // threads to have SATB queues with active set to false. |
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789 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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790 false /* expected_active */); |
342 | 791 |
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792 _root_regions.prepare_for_scan(); |
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793 |
342 | 794 // update_g1_committed() will be called at the end of an evac pause |
795 // when marking is on. So, it's also called at the end of the | |
796 // initial-mark pause to update the heap end, if the heap expands | |
797 // during it. No need to call it here. | |
798 } | |
799 | |
800 /* | |
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801 * Notice that in the next two methods, we actually leave the STS |
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802 * during the barrier sync and join it immediately afterwards. If we |
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803 * do not do this, the following deadlock can occur: one thread could |
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804 * be in the barrier sync code, waiting for the other thread to also |
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805 * sync up, whereas another one could be trying to yield, while also |
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806 * waiting for the other threads to sync up too. |
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807 * |
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808 * Note, however, that this code is also used during remark and in |
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809 * this case we should not attempt to leave / enter the STS, otherwise |
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810 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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811 * (product). So we should only leave / enter the STS if we are |
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812 * operating concurrently. |
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813 * |
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814 * Because the thread that does the sync barrier has left the STS, it |
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815 * is possible to be suspended for a Full GC or an evacuation pause |
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816 * could occur. This is actually safe, since the entering the sync |
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817 * barrier is one of the last things do_marking_step() does, and it |
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818 * doesn't manipulate any data structures afterwards. |
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819 */ |
342 | 820 |
821 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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822 if (verbose_low()) { |
342 | 823 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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824 } |
342 | 825 |
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826 if (concurrent()) { |
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827 ConcurrentGCThread::stsLeave(); |
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828 } |
342 | 829 _first_overflow_barrier_sync.enter(); |
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830 if (concurrent()) { |
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831 ConcurrentGCThread::stsJoin(); |
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832 } |
342 | 833 // at this point everyone should have synced up and not be doing any |
834 // more work | |
835 | |
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836 if (verbose_low()) { |
342 | 837 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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838 } |
342 | 839 |
840 // let task 0 do this | |
841 if (task_num == 0) { | |
842 // task 0 is responsible for clearing the global data structures | |
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843 // We should be here because of an overflow. During STW we should |
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844 // not clear the overflow flag since we rely on it being true when |
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845 // we exit this method to abort the pause and restart concurent |
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846 // marking. |
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847 clear_marking_state(concurrent() /* clear_overflow */); |
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848 force_overflow()->update(); |
342 | 849 |
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850 if (G1Log::fine()) { |
342 | 851 gclog_or_tty->date_stamp(PrintGCDateStamps); |
852 gclog_or_tty->stamp(PrintGCTimeStamps); | |
853 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
854 } | |
855 } | |
856 | |
857 // after this, each task should reset its own data structures then | |
858 // then go into the second barrier | |
859 } | |
860 | |
861 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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862 if (verbose_low()) { |
342 | 863 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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864 } |
342 | 865 |
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866 if (concurrent()) { |
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867 ConcurrentGCThread::stsLeave(); |
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868 } |
342 | 869 _second_overflow_barrier_sync.enter(); |
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870 if (concurrent()) { |
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871 ConcurrentGCThread::stsJoin(); |
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872 } |
342 | 873 // at this point everything should be re-initialised and ready to go |
874 | |
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875 if (verbose_low()) { |
342 | 876 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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877 } |
342 | 878 } |
879 | |
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880 #ifndef PRODUCT |
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881 void ForceOverflowSettings::init() { |
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882 _num_remaining = G1ConcMarkForceOverflow; |
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883 _force = false; |
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884 update(); |
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885 } |
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886 |
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887 void ForceOverflowSettings::update() { |
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888 if (_num_remaining > 0) { |
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889 _num_remaining -= 1; |
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890 _force = true; |
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891 } else { |
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892 _force = false; |
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893 } |
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894 } |
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895 |
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896 bool ForceOverflowSettings::should_force() { |
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897 if (_force) { |
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898 _force = false; |
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899 return true; |
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900 } else { |
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901 return false; |
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902 } |
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903 } |
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904 #endif // !PRODUCT |
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905 |
342 | 906 class CMConcurrentMarkingTask: public AbstractGangTask { |
907 private: | |
908 ConcurrentMark* _cm; | |
909 ConcurrentMarkThread* _cmt; | |
910 | |
911 public: | |
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912 void work(uint worker_id) { |
1023
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913 assert(Thread::current()->is_ConcurrentGC_thread(), |
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914 "this should only be done by a conc GC thread"); |
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915 ResourceMark rm; |
342 | 916 |
917 double start_vtime = os::elapsedVTime(); | |
918 | |
919 ConcurrentGCThread::stsJoin(); | |
920 | |
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921 assert(worker_id < _cm->active_tasks(), "invariant"); |
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922 CMTask* the_task = _cm->task(worker_id); |
342 | 923 the_task->record_start_time(); |
924 if (!_cm->has_aborted()) { | |
925 do { | |
926 double start_vtime_sec = os::elapsedVTime(); | |
927 double start_time_sec = os::elapsedTime(); | |
2174
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928 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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929 |
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930 the_task->do_marking_step(mark_step_duration_ms, |
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931 true /* do_stealing */, |
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932 true /* do_termination */); |
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933 |
342 | 934 double end_time_sec = os::elapsedTime(); |
935 double end_vtime_sec = os::elapsedVTime(); | |
936 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
937 double elapsed_time_sec = end_time_sec - start_time_sec; | |
938 _cm->clear_has_overflown(); | |
939 | |
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940 bool ret = _cm->do_yield_check(worker_id); |
342 | 941 |
942 jlong sleep_time_ms; | |
943 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
944 sleep_time_ms = | |
945 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
946 ConcurrentGCThread::stsLeave(); | |
947 os::sleep(Thread::current(), sleep_time_ms, false); | |
948 ConcurrentGCThread::stsJoin(); | |
949 } | |
950 double end_time2_sec = os::elapsedTime(); | |
951 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
952 | |
953 #if 0 | |
954 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
955 "overhead %1.4lf", | |
956 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
957 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
958 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
959 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
960 #endif | |
961 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
962 } | |
963 the_task->record_end_time(); | |
1023
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964 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 965 |
966 ConcurrentGCThread::stsLeave(); | |
967 | |
968 double end_vtime = os::elapsedVTime(); | |
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969 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 970 } |
971 | |
972 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
973 ConcurrentMarkThread* cmt) : | |
974 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
975 | |
976 ~CMConcurrentMarkingTask() { } | |
977 }; | |
978 | |
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979 // Calculates the number of active workers for a concurrent |
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980 // phase. |
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981 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 982 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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983 uint n_conc_workers = 0; |
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984 if (!UseDynamicNumberOfGCThreads || |
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985 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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986 !ForceDynamicNumberOfGCThreads)) { |
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987 n_conc_workers = max_parallel_marking_threads(); |
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988 } else { |
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989 n_conc_workers = |
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990 AdaptiveSizePolicy::calc_default_active_workers( |
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991 max_parallel_marking_threads(), |
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992 1, /* Minimum workers */ |
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993 parallel_marking_threads(), |
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994 Threads::number_of_non_daemon_threads()); |
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995 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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996 // that scaling has already gone into "_max_parallel_marking_threads". |
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997 } |
4711 | 998 assert(n_conc_workers > 0, "Always need at least 1"); |
999 return n_conc_workers; | |
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1000 } |
4711 | 1001 // If we are not running with any parallel GC threads we will not |
1002 // have spawned any marking threads either. Hence the number of | |
1003 // concurrent workers should be 0. | |
1004 return 0; | |
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1005 } |
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1006 |
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1007 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1008 // Currently, only survivors can be root regions. |
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1009 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1010 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1011 |
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1012 const uintx interval = PrefetchScanIntervalInBytes; |
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1013 HeapWord* curr = hr->bottom(); |
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1014 const HeapWord* end = hr->top(); |
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1015 while (curr < end) { |
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1016 Prefetch::read(curr, interval); |
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1017 oop obj = oop(curr); |
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1018 int size = obj->oop_iterate(&cl); |
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1019 assert(size == obj->size(), "sanity"); |
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1020 curr += size; |
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1021 } |
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1022 } |
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1023 |
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1024 class CMRootRegionScanTask : public AbstractGangTask { |
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1025 private: |
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1026 ConcurrentMark* _cm; |
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1027 |
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1028 public: |
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1029 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1030 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1031 |
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1032 void work(uint worker_id) { |
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1033 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1034 "this should only be done by a conc GC thread"); |
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1035 |
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1036 CMRootRegions* root_regions = _cm->root_regions(); |
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1037 HeapRegion* hr = root_regions->claim_next(); |
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1038 while (hr != NULL) { |
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1039 _cm->scanRootRegion(hr, worker_id); |
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1040 hr = root_regions->claim_next(); |
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1041 } |
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1042 } |
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1043 }; |
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1044 |
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1045 void ConcurrentMark::scanRootRegions() { |
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1046 // scan_in_progress() will have been set to true only if there was |
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1047 // at least one root region to scan. So, if it's false, we |
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1048 // should not attempt to do any further work. |
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1049 if (root_regions()->scan_in_progress()) { |
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1050 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1051 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1052 "Maximum number of marking threads exceeded"); |
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1053 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1054 |
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1055 CMRootRegionScanTask task(this); |
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1056 if (parallel_marking_threads() > 0) { |
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1057 _parallel_workers->set_active_workers((int) active_workers); |
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1058 _parallel_workers->run_task(&task); |
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1059 } else { |
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1060 task.work(0); |
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1061 } |
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1062 |
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1063 // It's possible that has_aborted() is true here without actually |
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1064 // aborting the survivor scan earlier. This is OK as it's |
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1065 // mainly used for sanity checking. |
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1066 root_regions()->scan_finished(); |
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1067 } |
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1068 } |
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1069 |
342 | 1070 void ConcurrentMark::markFromRoots() { |
1071 // we might be tempted to assert that: | |
1072 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1073 // "inconsistent argument?"); | |
1074 // However that wouldn't be right, because it's possible that | |
1075 // a safepoint is indeed in progress as a younger generation | |
1076 // stop-the-world GC happens even as we mark in this generation. | |
1077 | |
1078 _restart_for_overflow = false; | |
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1079 force_overflow_conc()->init(); |
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1080 |
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1081 // _g1h has _n_par_threads |
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1082 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1083 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1084 "Maximum number of marking threads exceeded"); |
4711 | 1085 |
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1086 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1087 |
1088 // Parallel task terminator is set in "set_phase()" | |
1089 set_phase(active_workers, true /* concurrent */); | |
342 | 1090 |
1091 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1092 if (parallel_marking_threads() > 0) { |
4711 | 1093 _parallel_workers->set_active_workers((int)active_workers); |
1094 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
1095 // and the decisions on that MT processing is made elsewhere. | |
1096 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1097 _parallel_workers->run_task(&markingTask); |
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1098 } else { |
342 | 1099 markingTask.work(0); |
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1100 } |
342 | 1101 print_stats(); |
1102 } | |
1103 | |
1104 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1105 // world is stopped at this checkpoint | |
1106 assert(SafepointSynchronize::is_at_safepoint(), | |
1107 "world should be stopped"); | |
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1108 |
342 | 1109 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1110 | |
1111 // If a full collection has happened, we shouldn't do this. | |
1112 if (has_aborted()) { | |
1113 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1114 return; | |
1115 } | |
1116 | |
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1117 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1118 |
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1119 if (VerifyDuringGC) { |
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1120 HandleMark hm; // handle scope |
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1121 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1122 Universe::heap()->prepare_for_verify(); |
6008 | 1123 Universe::verify(/* silent */ false, |
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1124 /* option */ VerifyOption_G1UsePrevMarking); |
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1125 } |
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1126 |
342 | 1127 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1128 g1p->record_concurrent_mark_remark_start(); | |
1129 | |
1130 double start = os::elapsedTime(); | |
1131 | |
1132 checkpointRootsFinalWork(); | |
1133 | |
1134 double mark_work_end = os::elapsedTime(); | |
1135 | |
1136 weakRefsWork(clear_all_soft_refs); | |
1137 | |
1138 if (has_overflown()) { | |
1139 // Oops. We overflowed. Restart concurrent marking. | |
1140 _restart_for_overflow = true; | |
1141 // Clear the flag. We do not need it any more. | |
1142 clear_has_overflown(); | |
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1143 if (G1TraceMarkStackOverflow) { |
342 | 1144 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1145 } |
342 | 1146 } else { |
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1147 // Aggregate the per-task counting data that we have accumulated |
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1148 // while marking. |
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1149 aggregate_count_data(); |
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1150 |
2149 | 1151 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1152 // We're done with marking. |
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1153 // This is the end of the marking cycle, we're expected all |
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1154 // threads to have SATB queues with active set to true. |
2149 | 1155 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1156 true /* expected_active */); | |
811 | 1157 |
1158 if (VerifyDuringGC) { | |
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1159 HandleMark hm; // handle scope |
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1160 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1161 Universe::heap()->prepare_for_verify(); |
6008 | 1162 Universe::verify(/* silent */ false, |
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1163 /* option */ VerifyOption_G1UseNextMarking); |
811 | 1164 } |
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1165 assert(!restart_for_overflow(), "sanity"); |
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1166 } |
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1167 |
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1168 // Reset the marking state if marking completed |
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1169 if (!restart_for_overflow()) { |
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1170 set_non_marking_state(); |
342 | 1171 } |
1172 | |
1173 #if VERIFY_OBJS_PROCESSED | |
1174 _scan_obj_cl.objs_processed = 0; | |
1175 ThreadLocalObjQueue::objs_enqueued = 0; | |
1176 #endif | |
1177 | |
1178 // Statistics | |
1179 double now = os::elapsedTime(); | |
1180 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1181 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1182 _remark_times.add((now - start) * 1000.0); | |
1183 | |
1184 g1p->record_concurrent_mark_remark_end(); | |
1185 } | |
1186 | |
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1187 // Used to calculate the # live objects per region |
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1188 // for verification purposes |
342 | 1189 class CalcLiveObjectsClosure: public HeapRegionClosure { |
1190 | |
1191 CMBitMapRO* _bm; | |
1192 ConcurrentMark* _cm; | |
1193 BitMap* _region_bm; | |
1194 BitMap* _card_bm; | |
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1195 |
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1196 // Debugging |
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1197 size_t _tot_words_done; |
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1198 size_t _tot_live; |
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1199 size_t _tot_used; |
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1200 |
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1201 size_t _region_marked_bytes; |
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1202 |
342 | 1203 intptr_t _bottom_card_num; |
1204 | |
1205 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
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1206 assert(start_card_num <= last_card_num, "sanity"); |
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1207 BitMap::idx_t start_idx = start_card_num - _bottom_card_num; |
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1208 BitMap::idx_t last_idx = last_card_num - _bottom_card_num; |
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1209 |
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1210 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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1211 _card_bm->par_at_put(i, 1); |
342 | 1212 } |
1213 } | |
1214 | |
1215 public: | |
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1216 CalcLiveObjectsClosure(CMBitMapRO *bm, ConcurrentMark *cm, |
936 | 1217 BitMap* region_bm, BitMap* card_bm) : |
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1218 _bm(bm), _cm(cm), _region_bm(region_bm), _card_bm(card_bm), |
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1219 _region_marked_bytes(0), _tot_words_done(0), |
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1220 _tot_live(0), _tot_used(0), |
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1221 _bottom_card_num(cm->heap_bottom_card_num()) { } |
342 | 1222 |
829 | 1223 // It takes a region that's not empty (i.e., it has at least one |
1224 // live object in it and sets its corresponding bit on the region | |
1225 // bitmap to 1. If the region is "starts humongous" it will also set | |
1226 // to 1 the bits on the region bitmap that correspond to its | |
1227 // associated "continues humongous" regions. | |
1228 void set_bit_for_region(HeapRegion* hr) { | |
1229 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1230 | |
1231 size_t index = hr->hrs_index(); | |
1232 if (!hr->startsHumongous()) { | |
1233 // Normal (non-humongous) case: just set the bit. | |
1234 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
1235 } else { | |
1236 // Starts humongous case: calculate how many regions are part of | |
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1237 // this humongous region and then set the bit range. |
829 | 1238 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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1239 HeapRegion *last_hr = g1h->heap_region_containing_raw(hr->end() - 1); |
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1240 size_t end_index = last_hr->hrs_index() + 1; |
829 | 1241 _region_bm->par_at_put_range((BitMap::idx_t) index, |
1242 (BitMap::idx_t) end_index, true); | |
1243 } | |
1244 } | |
1245 | |
342 | 1246 bool doHeapRegion(HeapRegion* hr) { |
1247 | |
639 | 1248 if (hr->continuesHumongous()) { |
829 | 1249 // We will ignore these here and process them when their |
1250 // associated "starts humongous" region is processed (see | |
1251 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1252 // associated "starts humongous" region to have their bit set to | |
1253 // 1 since, due to the region chunking in the parallel region | |
1254 // iteration, a "continues humongous" region might be visited | |
1255 // before its associated "starts humongous". | |
639 | 1256 return false; |
1257 } | |
342 | 1258 |
1259 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
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1260 HeapWord* start = hr->bottom(); |
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1261 |
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1262 assert(start <= hr->end() && start <= nextTop && nextTop <= hr->end(), |
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1263 err_msg("Preconditions not met - " |
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1264 "start: "PTR_FORMAT", nextTop: "PTR_FORMAT", end: "PTR_FORMAT, |
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1265 start, nextTop, hr->end())); |
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1266 |
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1267 // Record the number of word's we'll examine. |
342 | 1268 size_t words_done = (nextTop - start); |
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1269 |
342 | 1270 // Find the first marked object at or after "start". |
1271 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
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1272 |
342 | 1273 size_t marked_bytes = 0; |
1274 | |
1275 // Below, the term "card num" means the result of shifting an address | |
1276 // by the card shift -- address 0 corresponds to card number 0. One | |
1277 // must subtract the card num of the bottom of the heap to obtain a | |
1278 // card table index. | |
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1279 |
342 | 1280 // The first card num of the sequence of live cards currently being |
1281 // constructed. -1 ==> no sequence. | |
1282 intptr_t start_card_num = -1; | |
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1283 |
342 | 1284 // The last card num of the sequence of live cards currently being |
1285 // constructed. -1 ==> no sequence. | |
1286 intptr_t last_card_num = -1; | |
1287 | |
1288 while (start < nextTop) { | |
1289 oop obj = oop(start); | |
1290 int obj_sz = obj->size(); | |
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1291 |
342 | 1292 // The card num of the start of the current object. |
1293 intptr_t obj_card_num = | |
1294 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
1295 HeapWord* obj_last = start + obj_sz - 1; | |
1296 intptr_t obj_last_card_num = | |
1297 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
1298 | |
1299 if (obj_card_num != last_card_num) { | |
1300 if (start_card_num == -1) { | |
1301 assert(last_card_num == -1, "Both or neither."); | |
1302 start_card_num = obj_card_num; | |
1303 } else { | |
1304 assert(last_card_num != -1, "Both or neither."); | |
1305 assert(obj_card_num >= last_card_num, "Inv"); | |
1306 if ((obj_card_num - last_card_num) > 1) { | |
1307 // Mark the last run, and start a new one. | |
1308 mark_card_num_range(start_card_num, last_card_num); | |
1309 start_card_num = obj_card_num; | |
1310 } | |
1311 } | |
1312 } | |
1313 // In any case, we set the last card num. | |
1314 last_card_num = obj_last_card_num; | |
1315 | |
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1316 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1317 |
342 | 1318 // Find the next marked object after this one. |
1319 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
1320 } | |
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1321 |
342 | 1322 // Handle the last range, if any. |
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1323 if (start_card_num != -1) { |
342 | 1324 mark_card_num_range(start_card_num, last_card_num); |
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1325 } |
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1326 |
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1327 // Mark the allocated-since-marking portion... |
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1328 HeapWord* top = hr->top(); |
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1329 if (nextTop < top) { |
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1330 start_card_num = intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); |
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1331 last_card_num = intptr_t(uintptr_t(top) >> CardTableModRefBS::card_shift); |
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1332 |
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1333 mark_card_num_range(start_card_num, last_card_num); |
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1334 |
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1335 // This definitely means the region has live objects. |
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1336 set_bit_for_region(hr); |
342 | 1337 } |
1338 | |
1339 // Update the live region bitmap. | |
1340 if (marked_bytes > 0) { | |
829 | 1341 set_bit_for_region(hr); |
342 | 1342 } |
4836
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1343 |
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1344 // Set the marked bytes for the current region so that |
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1345 // it can be queried by a calling verificiation routine |
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1346 _region_marked_bytes = marked_bytes; |
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1347 |
342 | 1348 _tot_live += hr->next_live_bytes(); |
1349 _tot_used += hr->used(); | |
4836
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1350 _tot_words_done = words_done; |
342 | 1351 |
1352 return false; | |
1353 } | |
1354 | |
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1355 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1356 |
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1357 // Debugging |
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1358 size_t tot_words_done() const { return _tot_words_done; } |
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1359 size_t tot_live() const { return _tot_live; } |
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1360 size_t tot_used() const { return _tot_used; } |
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1361 }; |
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1362 |
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1363 // Heap region closure used for verifying the counting data |
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1364 // that was accumulated concurrently and aggregated during |
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1365 // the remark pause. This closure is applied to the heap |
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1366 // regions during the STW cleanup pause. |
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1367 |
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1368 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1369 ConcurrentMark* _cm; |
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1370 CalcLiveObjectsClosure _calc_cl; |
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1371 BitMap* _region_bm; // Region BM to be verified |
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1372 BitMap* _card_bm; // Card BM to be verified |
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1373 bool _verbose; // verbose output? |
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1374 |
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1375 BitMap* _exp_region_bm; // Expected Region BM values |
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1376 BitMap* _exp_card_bm; // Expected card BM values |
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1377 |
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1378 int _failures; |
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1379 |
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1380 public: |
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1381 VerifyLiveObjectDataHRClosure(ConcurrentMark* cm, |
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1382 BitMap* region_bm, |
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1383 BitMap* card_bm, |
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1384 BitMap* exp_region_bm, |
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1385 BitMap* exp_card_bm, |
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1386 bool verbose) : |
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1387 _cm(cm), |
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1388 _calc_cl(_cm->nextMarkBitMap(), _cm, exp_region_bm, exp_card_bm), |
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1389 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1390 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1391 _failures(0) { } |
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1392 |
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1393 int failures() const { return _failures; } |
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1394 |
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1395 bool doHeapRegion(HeapRegion* hr) { |
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1396 if (hr->continuesHumongous()) { |
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1397 // We will ignore these here and process them when their |
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1398 // associated "starts humongous" region is processed (see |
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1399 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1400 // associated "starts humongous" region to have their bit set to |
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1401 // 1 since, due to the region chunking in the parallel region |
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1402 // iteration, a "continues humongous" region might be visited |
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1403 // before its associated "starts humongous". |
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1404 return false; |
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1405 } |
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1406 |
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1407 int failures = 0; |
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1408 |
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1409 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1410 // this region and set the corresponding bits in the expected region |
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1411 // and card bitmaps. |
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1412 bool res = _calc_cl.doHeapRegion(hr); |
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1413 assert(res == false, "should be continuing"); |
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1414 |
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1415 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1416 Mutex::_no_safepoint_check_flag); |
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1417 |
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1418 // Verify that _top_at_conc_count == ntams |
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1419 if (hr->top_at_conc_mark_count() != hr->next_top_at_mark_start()) { |
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1420 if (_verbose) { |
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1421 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": top at conc count incorrect: " |
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1422 "expected " PTR_FORMAT ", actual: " PTR_FORMAT, |
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1423 hr->hrs_index(), hr->next_top_at_mark_start(), |
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1424 hr->top_at_conc_mark_count()); |
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1425 } |
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1426 failures += 1; |
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1427 } |
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1428 |
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1429 // Verify the marked bytes for this region. |
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1430 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1431 size_t act_marked_bytes = hr->next_marked_bytes(); |
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1432 |
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1433 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1434 // we have missed accounting some objects during the actual marking. |
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1435 if (exp_marked_bytes > act_marked_bytes) { |
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1436 if (_verbose) { |
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1437 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": marked bytes mismatch: " |
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1438 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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1439 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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1440 } |
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1441 failures += 1; |
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1442 } |
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1443 |
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1444 // Verify the bit, for this region, in the actual and expected |
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1445 // (which was just calculated) region bit maps. |
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1446 // We're not OK if the bit in the calculated expected region |
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1447 // bitmap is set and the bit in the actual region bitmap is not. |
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1448 BitMap::idx_t index = (BitMap::idx_t)hr->hrs_index(); |
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1449 |
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1450 bool expected = _exp_region_bm->at(index); |
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1451 bool actual = _region_bm->at(index); |
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1452 if (expected && !actual) { |
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1453 if (_verbose) { |
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1454 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": region bitmap mismatch: " |
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1455 "expected: %d, actual: %d", |
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1456 hr->hrs_index(), expected, actual); |
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1457 } |
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1458 failures += 1; |
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1459 } |
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1460 |
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1461 // Verify that the card bit maps for the cards spanned by the current |
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1462 // region match. We have an error if we have a set bit in the expected |
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1463 // bit map and the corresponding bit in the actual bitmap is not set. |
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1464 |
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1465 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1466 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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1467 |
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1468 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1469 expected = _exp_card_bm->at(i); |
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1470 actual = _card_bm->at(i); |
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|
1471 |
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1472 if (expected && !actual) { |
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1473 if (_verbose) { |
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1474 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": card bitmap mismatch at " SIZE_FORMAT ": " |
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1475 "expected: %d, actual: %d", |
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1476 hr->hrs_index(), i, expected, actual); |
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1477 } |
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1478 failures += 1; |
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|
1479 } |
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|
1480 } |
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|
1481 |
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1482 if (failures > 0 && _verbose) { |
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1483 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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1484 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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1485 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
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1486 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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1487 } |
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|
1488 |
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1489 _failures += failures; |
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|
1490 |
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1491 // We could stop iteration over the heap when we |
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1492 // find the first voilating region by returning true. |
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1493 return false; |
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1494 } |
342 | 1495 }; |
1496 | |
1497 | |
4836
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1498 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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1499 protected: |
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1500 G1CollectedHeap* _g1h; |
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1501 ConcurrentMark* _cm; |
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1502 BitMap* _actual_region_bm; |
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1503 BitMap* _actual_card_bm; |
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1504 |
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1505 uint _n_workers; |
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|
1506 |
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1507 BitMap* _expected_region_bm; |
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1508 BitMap* _expected_card_bm; |
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|
1509 |
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1510 int _failures; |
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1511 bool _verbose; |
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|
1512 |
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|
1513 public: |
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1514 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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1515 BitMap* region_bm, BitMap* card_bm, |
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1516 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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1517 : AbstractGangTask("G1 verify final counting"), |
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1518 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1519 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1520 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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1521 _failures(0), _verbose(false), |
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1522 _n_workers(0) { |
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1523 assert(VerifyDuringGC, "don't call this otherwise"); |
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1524 |
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1525 // Use the value already set as the number of active threads |
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1526 // in the call to run_task(). |
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1527 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1528 assert( _g1h->workers()->active_workers() > 0, |
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1529 "Should have been previously set"); |
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1530 _n_workers = _g1h->workers()->active_workers(); |
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1531 } else { |
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1532 _n_workers = 1; |
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|
1533 } |
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|
1534 |
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1535 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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1536 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1537 |
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|
1538 _verbose = _cm->verbose_medium(); |
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|
1539 } |
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|
1540 |
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|
1541 void work(uint worker_id) { |
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|
1542 assert(worker_id < _n_workers, "invariant"); |
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|
1543 |
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|
1544 VerifyLiveObjectDataHRClosure verify_cl(_cm, |
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|
1545 _actual_region_bm, _actual_card_bm, |
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|
1546 _expected_region_bm, |
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|
1547 _expected_card_bm, |
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|
1548 _verbose); |
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|
1549 |
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|
1550 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1551 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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|
1552 worker_id, |
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|
1553 _n_workers, |
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|
1554 HeapRegion::VerifyCountClaimValue); |
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|
1555 } else { |
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|
1556 _g1h->heap_region_iterate(&verify_cl); |
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|
1557 } |
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|
1558 |
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|
1559 Atomic::add(verify_cl.failures(), &_failures); |
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|
1560 } |
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changeset
|
1561 |
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|
1562 int failures() const { return _failures; } |
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|
1563 }; |
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|
1564 |
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|
1565 // Final update of count data (during cleanup). |
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|
1566 // Adds [top_at_count, NTAMS) to the marked bytes for each |
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1567 // region. Sets the bits in the card bitmap corresponding |
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|
1568 // to the interval [top_at_count, top], and sets the |
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|
1569 // liveness bit for each region containing live data |
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|
1570 // in the region bitmap. |
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|
1571 |
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|
1572 class FinalCountDataUpdateClosure: public HeapRegionClosure { |
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|
1573 ConcurrentMark* _cm; |
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|
1574 BitMap* _region_bm; |
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|
1575 BitMap* _card_bm; |
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|
1576 |
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|
1577 size_t _total_live_bytes; |
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|
1578 size_t _total_used_bytes; |
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|
1579 size_t _total_words_done; |
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|
1580 |
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|
1581 void set_card_bitmap_range(BitMap::idx_t start_idx, BitMap::idx_t last_idx) { |
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|
1582 assert(start_idx <= last_idx, "sanity"); |
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|
1583 |
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changeset
|
1584 // Set the inclusive bit range [start_idx, last_idx]. |
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|
1585 // For small ranges (up to 8 cards) use a simple loop; otherwise |
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|
1586 // use par_at_put_range. |
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|
1587 if ((last_idx - start_idx) <= 8) { |
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|
1588 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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|
1589 _card_bm->par_set_bit(i); |
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|
1590 } |
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|
1591 } else { |
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|
1592 assert(last_idx < _card_bm->size(), "sanity"); |
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|
1593 // Note BitMap::par_at_put_range() is exclusive. |
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|
1594 _card_bm->par_at_put_range(start_idx, last_idx+1, true); |
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|
1595 } |
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|
1596 } |
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changeset
|
1597 |
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|
1598 // It takes a region that's not empty (i.e., it has at least one |
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1599 // live object in it and sets its corresponding bit on the region |
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1600 // bitmap to 1. If the region is "starts humongous" it will also set |
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1601 // to 1 the bits on the region bitmap that correspond to its |
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1602 // associated "continues humongous" regions. |
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1603 void set_bit_for_region(HeapRegion* hr) { |
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1604 assert(!hr->continuesHumongous(), "should have filtered those out"); |
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1605 |
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1606 size_t index = hr->hrs_index(); |
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1607 if (!hr->startsHumongous()) { |
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1608 // Normal (non-humongous) case: just set the bit. |
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1609 _region_bm->par_set_bit((BitMap::idx_t) index); |
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1610 } else { |
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1611 // Starts humongous case: calculate how many regions are part of |
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1612 // this humongous region and then set the bit range. |
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1613 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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1614 HeapRegion *last_hr = g1h->heap_region_containing_raw(hr->end() - 1); |
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1615 size_t end_index = last_hr->hrs_index() + 1; |
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1616 _region_bm->par_at_put_range((BitMap::idx_t) index, |
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1617 (BitMap::idx_t) end_index, true); |
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1618 } |
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1619 } |
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1620 |
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1621 public: |
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1622 FinalCountDataUpdateClosure(ConcurrentMark* cm, |
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1623 BitMap* region_bm, |
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1624 BitMap* card_bm) : |
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1625 _cm(cm), _region_bm(region_bm), _card_bm(card_bm), |
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1626 _total_words_done(0), _total_live_bytes(0), _total_used_bytes(0) { } |
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1627 |
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1628 bool doHeapRegion(HeapRegion* hr) { |
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1629 |
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1630 if (hr->continuesHumongous()) { |
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1631 // We will ignore these here and process them when their |
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1632 // associated "starts humongous" region is processed (see |
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1633 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1634 // associated "starts humongous" region to have their bit set to |
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1635 // 1 since, due to the region chunking in the parallel region |
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1636 // iteration, a "continues humongous" region might be visited |
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1637 // before its associated "starts humongous". |
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1638 return false; |
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|
1639 } |
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|
1640 |
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1641 HeapWord* start = hr->top_at_conc_mark_count(); |
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1642 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1643 HeapWord* top = hr->top(); |
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1644 |
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1645 assert(hr->bottom() <= start && start <= hr->end() && |
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1646 hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
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1647 |
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1648 size_t words_done = ntams - hr->bottom(); |
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1649 |
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1650 if (start < ntams) { |
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1651 // Region was changed between remark and cleanup pauses |
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1652 // We need to add (ntams - start) to the marked bytes |
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1653 // for this region, and set bits for the range |
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1654 // [ card_idx(start), card_idx(ntams) ) in the card bitmap. |
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1655 size_t live_bytes = (ntams - start) * HeapWordSize; |
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1656 hr->add_to_marked_bytes(live_bytes); |
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1657 |
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1658 // Record the new top at conc count |
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1659 hr->set_top_at_conc_mark_count(ntams); |
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1660 |
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1661 // The setting of the bits in the card bitmap takes place below |
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|
1662 } |
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|
1663 |
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1664 // Mark the allocated-since-marking portion... |
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1665 if (ntams < top) { |
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1666 // This definitely means the region has live objects. |
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1667 set_bit_for_region(hr); |
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|
1668 } |
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|
1669 |
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1670 // Now set the bits for [start, top] |
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1671 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1672 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top); |
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1673 set_card_bitmap_range(start_idx, last_idx); |
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1674 |
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1675 // Set the bit for the region if it contains live data |
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1676 if (hr->next_marked_bytes() > 0) { |
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1677 set_bit_for_region(hr); |
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|
1678 } |
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|
1679 |
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1680 _total_words_done += words_done; |
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1681 _total_used_bytes += hr->used(); |
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1682 _total_live_bytes += hr->next_marked_bytes(); |
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|
1683 |
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|
1684 return false; |
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|
1685 } |
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|
1686 |
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|
1687 size_t total_words_done() const { return _total_words_done; } |
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1688 size_t total_live_bytes() const { return _total_live_bytes; } |
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1689 size_t total_used_bytes() const { return _total_used_bytes; } |
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1690 }; |
342 | 1691 |
1692 class G1ParFinalCountTask: public AbstractGangTask { | |
1693 protected: | |
1694 G1CollectedHeap* _g1h; | |
4836
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1695 ConcurrentMark* _cm; |
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1696 BitMap* _actual_region_bm; |
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1697 BitMap* _actual_card_bm; |
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1698 |
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1699 uint _n_workers; |
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1700 |
342 | 1701 size_t *_live_bytes; |
1702 size_t *_used_bytes; | |
4836
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1703 |
342 | 1704 public: |
4836
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1705 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1706 : AbstractGangTask("G1 final counting"), |
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1707 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1708 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1709 _n_workers(0) { |
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1710 // Use the value already set as the number of active threads |
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1711 // in the call to run_task(). Needed for the allocation of |
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1712 // _live_bytes and _used_bytes. |
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1713 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1714 assert( _g1h->workers()->active_workers() > 0, |
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1715 "Should have been previously set"); |
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1716 _n_workers = _g1h->workers()->active_workers(); |
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1717 } else { |
342 | 1718 _n_workers = 1; |
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1719 } |
4095
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1720 |
342 | 1721 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); |
1722 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
1723 } | |
1724 | |
1725 ~G1ParFinalCountTask() { | |
1726 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
1727 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
1728 } | |
1729 | |
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1730 void work(uint worker_id) { |
4836
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1731 assert(worker_id < _n_workers, "invariant"); |
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1732 |
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1733 FinalCountDataUpdateClosure final_update_cl(_cm, |
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1734 _actual_region_bm, |
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1735 _actual_card_bm); |
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1736 |
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1737 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1738 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1739 worker_id, |
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1740 _n_workers, |
355 | 1741 HeapRegion::FinalCountClaimValue); |
342 | 1742 } else { |
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1743 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1744 } |
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1745 |
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1746 _live_bytes[worker_id] = final_update_cl.total_live_bytes(); |
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1747 _used_bytes[worker_id] = final_update_cl.total_used_bytes(); |
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1748 } |
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1749 |
342 | 1750 size_t live_bytes() { |
1751 size_t live_bytes = 0; | |
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1752 for (uint i = 0; i < _n_workers; ++i) |
342 | 1753 live_bytes += _live_bytes[i]; |
1754 return live_bytes; | |
1755 } | |
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1756 |
342 | 1757 size_t used_bytes() { |
1758 size_t used_bytes = 0; | |
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1759 for (uint i = 0; i < _n_workers; ++i) |
342 | 1760 used_bytes += _used_bytes[i]; |
1761 return used_bytes; | |
1762 } | |
1763 }; | |
1764 | |
1765 class G1ParNoteEndTask; | |
1766 | |
1767 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1768 G1CollectedHeap* _g1; | |
1769 int _worker_num; | |
1770 size_t _max_live_bytes; | |
1771 size_t _regions_claimed; | |
1772 size_t _freed_bytes; | |
2173 | 1773 FreeRegionList* _local_cleanup_list; |
4072 | 1774 OldRegionSet* _old_proxy_set; |
2173 | 1775 HumongousRegionSet* _humongous_proxy_set; |
1776 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1777 double _claimed_region_time; |
1778 double _max_region_time; | |
1779 | |
1780 public: | |
1781 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1782 int worker_num, |
1783 FreeRegionList* local_cleanup_list, | |
4072 | 1784 OldRegionSet* old_proxy_set, |
2173 | 1785 HumongousRegionSet* humongous_proxy_set, |
4093
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1786 HRRSCleanupTask* hrrs_cleanup_task) : |
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1787 _g1(g1), _worker_num(worker_num), |
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1788 _max_live_bytes(0), _regions_claimed(0), |
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1789 _freed_bytes(0), |
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1790 _claimed_region_time(0.0), _max_region_time(0.0), |
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1791 _local_cleanup_list(local_cleanup_list), |
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1792 _old_proxy_set(old_proxy_set), |
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1793 _humongous_proxy_set(humongous_proxy_set), |
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1794 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1795 |
342 | 1796 size_t freed_bytes() { return _freed_bytes; } |
1797 | |
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1798 bool doHeapRegion(HeapRegion *hr) { |
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1799 // We use a claim value of zero here because all regions |
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1800 // were claimed with value 1 in the FinalCount task. |
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1801 hr->reset_gc_time_stamp(); |
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1802 if (!hr->continuesHumongous()) { |
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1803 double start = os::elapsedTime(); |
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1804 _regions_claimed++; |
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1805 hr->note_end_of_marking(); |
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1806 _max_live_bytes += hr->max_live_bytes(); |
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1807 _g1->free_region_if_empty(hr, |
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1808 &_freed_bytes, |
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1809 _local_cleanup_list, |
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1810 _old_proxy_set, |
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1811 _humongous_proxy_set, |
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1812 _hrrs_cleanup_task, |
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1813 true /* par */); |
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1814 double region_time = (os::elapsedTime() - start); |
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1815 _claimed_region_time += region_time; |
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1816 if (region_time > _max_region_time) { |
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1817 _max_region_time = region_time; |
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1818 } |
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1819 } |
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1820 return false; |
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1821 } |
342 | 1822 |
1823 size_t max_live_bytes() { return _max_live_bytes; } | |
1824 size_t regions_claimed() { return _regions_claimed; } | |
1825 double claimed_region_time_sec() { return _claimed_region_time; } | |
1826 double max_region_time_sec() { return _max_region_time; } | |
1827 }; | |
1828 | |
1829 class G1ParNoteEndTask: public AbstractGangTask { | |
1830 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1831 |
342 | 1832 protected: |
1833 G1CollectedHeap* _g1h; | |
1834 size_t _max_live_bytes; | |
1835 size_t _freed_bytes; | |
2152 | 1836 FreeRegionList* _cleanup_list; |
1837 | |
342 | 1838 public: |
1839 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1840 FreeRegionList* cleanup_list) : |
342 | 1841 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1842 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1843 |
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1844 void work(uint worker_id) { |
342 | 1845 double start = os::elapsedTime(); |
2173 | 1846 FreeRegionList local_cleanup_list("Local Cleanup List"); |
4072 | 1847 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
2173 | 1848 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
1849 HRRSCleanupTask hrrs_cleanup_task; | |
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1850 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
4072 | 1851 &old_proxy_set, |
2173 | 1852 &humongous_proxy_set, |
1853 &hrrs_cleanup_task); | |
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1854 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1855 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1856 _g1h->workers()->active_workers(), |
355 | 1857 HeapRegion::NoteEndClaimValue); |
342 | 1858 } else { |
1859 _g1h->heap_region_iterate(&g1_note_end); | |
1860 } | |
1861 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1862 | |
2152 | 1863 // Now update the lists |
1864 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1865 NULL /* free_list */, | |
4072 | 1866 &old_proxy_set, |
2173 | 1867 &humongous_proxy_set, |
2152 | 1868 true /* par */); |
342 | 1869 { |
1870 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1871 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1872 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1873 |
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1874 // If we iterate over the global cleanup list at the end of |
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1875 // cleanup to do this printing we will not guarantee to only |
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1876 // generate output for the newly-reclaimed regions (the list |
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1877 // might not be empty at the beginning of cleanup; we might |
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1878 // still be working on its previous contents). So we do the |
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1879 // printing here, before we append the new regions to the global |
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1880 // cleanup list. |
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1881 |
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1882 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1883 if (hr_printer->is_active()) { |
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1884 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1885 while (iter.more_available()) { |
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1886 HeapRegion* hr = iter.get_next(); |
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1887 hr_printer->cleanup(hr); |
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1888 } |
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1889 } |
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1890 |
2173 | 1891 _cleanup_list->add_as_tail(&local_cleanup_list); |
1892 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1893 | |
1894 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1895 } |
1896 double end = os::elapsedTime(); | |
1897 if (G1PrintParCleanupStats) { | |
1898 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
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1899 "claimed %u regions (tot = %8.3f ms, max = %8.3f ms).\n", |
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1900 worker_id, start, end, (end-start)*1000.0, |
342 | 1901 g1_note_end.regions_claimed(), |
1902 g1_note_end.claimed_region_time_sec()*1000.0, | |
1903 g1_note_end.max_region_time_sec()*1000.0); | |
1904 } | |
1905 } | |
1906 size_t max_live_bytes() { return _max_live_bytes; } | |
1907 size_t freed_bytes() { return _freed_bytes; } | |
1908 }; | |
1909 | |
1910 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1911 protected: | |
1912 G1RemSet* _g1rs; | |
1913 BitMap* _region_bm; | |
1914 BitMap* _card_bm; | |
1915 public: | |
1916 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1917 BitMap* region_bm, BitMap* card_bm) : | |
1918 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1919 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1920 |
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1921 void work(uint worker_id) { |
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1922 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1923 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1924 HeapRegion::ScrubRemSetClaimValue); |
342 | 1925 } else { |
1926 _g1rs->scrub(_region_bm, _card_bm); | |
1927 } | |
1928 } | |
1929 | |
1930 }; | |
1931 | |
1932 void ConcurrentMark::cleanup() { | |
1933 // world is stopped at this checkpoint | |
1934 assert(SafepointSynchronize::is_at_safepoint(), | |
1935 "world should be stopped"); | |
1936 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1937 | |
1938 // If a full collection has happened, we shouldn't do this. | |
1939 if (has_aborted()) { | |
1940 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1941 return; | |
1942 } | |
1943 | |
4072 | 1944 HRSPhaseSetter x(HRSPhaseCleanup); |
2152 | 1945 g1h->verify_region_sets_optional(); |
1946 | |
845
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1947 if (VerifyDuringGC) { |
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1948 HandleMark hm; // handle scope |
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1949 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1950 Universe::heap()->prepare_for_verify(); |
6008 | 1951 Universe::verify(/* silent */ false, |
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1952 /* option */ VerifyOption_G1UsePrevMarking); |
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1953 } |
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1954 |
342 | 1955 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1956 g1p->record_concurrent_mark_cleanup_start(); | |
1957 | |
1958 double start = os::elapsedTime(); | |
1959 | |
2173 | 1960 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1961 | |
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1962 uint n_workers; |
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1963 |
342 | 1964 // Do counting once more with the world stopped for good measure. |
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1965 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1966 |
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1967 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1968 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 1969 "sanity check"); |
1970 | |
4711 | 1971 g1h->set_par_threads(); |
1972 n_workers = g1h->n_par_threads(); | |
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1973 assert(g1h->n_par_threads() == n_workers, |
4711 | 1974 "Should not have been reset"); |
342 | 1975 g1h->workers()->run_task(&g1_par_count_task); |
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1976 // Done with the parallel phase so reset to 0. |
342 | 1977 g1h->set_par_threads(0); |
355 | 1978 |
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1979 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 1980 "sanity check"); |
342 | 1981 } else { |
4711 | 1982 n_workers = 1; |
342 | 1983 g1_par_count_task.work(0); |
1984 } | |
1985 | |
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1986 if (VerifyDuringGC) { |
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1987 // Verify that the counting data accumulated during marking matches |
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1988 // that calculated by walking the marking bitmap. |
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1989 |
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1990 // Bitmaps to hold expected values |
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1991 BitMap expected_region_bm(_region_bm.size(), false); |
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1992 BitMap expected_card_bm(_card_bm.size(), false); |
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1993 |
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1994 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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1995 &_region_bm, |
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1996 &_card_bm, |
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1997 &expected_region_bm, |
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1998 &expected_card_bm); |
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1999 |
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2000 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2001 g1h->set_par_threads((int)n_workers); |
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2002 g1h->workers()->run_task(&g1_par_verify_task); |
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2003 // Done with the parallel phase so reset to 0. |
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2004 g1h->set_par_threads(0); |
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2005 |
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2006 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2007 "sanity check"); |
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2008 } else { |
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2009 g1_par_verify_task.work(0); |
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2010 } |
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2011 |
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2012 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2013 } |
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2014 |
342 | 2015 size_t known_garbage_bytes = |
2016 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
2017 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
2018 | |
2019 size_t start_used_bytes = g1h->used(); | |
2020 g1h->set_marking_complete(); | |
2021 | |
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2022 ergo_verbose4(ErgoConcCycles, |
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2023 "finish cleanup", |
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2024 ergo_format_byte("occupancy") |
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2025 ergo_format_byte("capacity") |
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2026 ergo_format_byte_perc("known garbage"), |
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2027 start_used_bytes, g1h->capacity(), |
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2028 known_garbage_bytes, |
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2029 ((double) known_garbage_bytes / (double) g1h->capacity()) * 100.0); |
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2030 |
342 | 2031 double count_end = os::elapsedTime(); |
2032 double this_final_counting_time = (count_end - start); | |
2033 if (G1PrintParCleanupStats) { | |
2034 gclog_or_tty->print_cr("Cleanup:"); | |
2035 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
2036 this_final_counting_time*1000.0); | |
2037 } | |
2038 _total_counting_time += this_final_counting_time; | |
2039 | |
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2040 if (G1PrintRegionLivenessInfo) { |
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2041 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2042 _g1h->heap_region_iterate(&cl); |
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2043 } |
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2044 |
342 | 2045 // Install newly created mark bitMap as "prev". |
2046 swapMarkBitMaps(); | |
2047 | |
2048 g1h->reset_gc_time_stamp(); | |
2049 | |
2050 // Note end of marking in all heap regions. | |
2051 double note_end_start = os::elapsedTime(); | |
2152 | 2052 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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2053 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2054 g1h->set_par_threads((int)n_workers); |
342 | 2055 g1h->workers()->run_task(&g1_par_note_end_task); |
2056 g1h->set_par_threads(0); | |
355 | 2057 |
2058 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2059 "sanity check"); | |
342 | 2060 } else { |
2061 g1_par_note_end_task.work(0); | |
2062 } | |
2152 | 2063 |
2064 if (!cleanup_list_is_empty()) { | |
2065 // The cleanup list is not empty, so we'll have to process it | |
2066 // concurrently. Notify anyone else that might be wanting free | |
2067 // regions that there will be more free regions coming soon. | |
2068 g1h->set_free_regions_coming(); | |
2069 } | |
342 | 2070 double note_end_end = os::elapsedTime(); |
2071 if (G1PrintParCleanupStats) { | |
2072 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
2073 (note_end_end - note_end_start)*1000.0); | |
2074 } | |
2075 | |
2076 // call below, since it affects the metric by which we sort the heap | |
2077 // regions. | |
2078 if (G1ScrubRemSets) { | |
2079 double rs_scrub_start = os::elapsedTime(); | |
2080 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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2081 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2082 g1h->set_par_threads((int)n_workers); |
342 | 2083 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2084 g1h->set_par_threads(0); | |
355 | 2085 |
2086 assert(g1h->check_heap_region_claim_values( | |
2087 HeapRegion::ScrubRemSetClaimValue), | |
2088 "sanity check"); | |
342 | 2089 } else { |
2090 g1_par_scrub_rs_task.work(0); | |
2091 } | |
2092 | |
2093 double rs_scrub_end = os::elapsedTime(); | |
2094 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2095 _total_rs_scrub_time += this_rs_scrub_time; | |
2096 } | |
2097 | |
2098 // this will also free any regions totally full of garbage objects, | |
2099 // and sort the regions. | |
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2100 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2101 |
2102 // Statistics. | |
2103 double end = os::elapsedTime(); | |
2104 _cleanup_times.add((end - start) * 1000.0); | |
2105 | |
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2106 if (G1Log::fine()) { |
342 | 2107 g1h->print_size_transition(gclog_or_tty, |
2108 start_used_bytes, | |
2109 g1h->used(), | |
2110 g1h->capacity()); | |
2111 } | |
2112 | |
2113 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
2114 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
2115 | |
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2116 // Clean up will have freed any regions completely full of garbage. |
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2117 // Update the soft reference policy with the new heap occupancy. |
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2118 Universe::update_heap_info_at_gc(); |
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2119 |
342 | 2120 // We need to make this be a "collection" so any collection pause that |
2121 // races with it goes around and waits for completeCleanup to finish. | |
2122 g1h->increment_total_collections(); | |
2123 | |
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2124 // We reclaimed old regions so we should calculate the sizes to make |
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2125 // sure we update the old gen/space data. |
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2126 g1h->g1mm()->update_sizes(); |
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2127 |
751 | 2128 if (VerifyDuringGC) { |
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2129 HandleMark hm; // handle scope |
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2130 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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2131 Universe::heap()->prepare_for_verify(); |
6008 | 2132 Universe::verify(/* silent */ false, |
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2133 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 2134 } |
2152 | 2135 |
2136 g1h->verify_region_sets_optional(); | |
342 | 2137 } |
2138 | |
2139 void ConcurrentMark::completeCleanup() { | |
2140 if (has_aborted()) return; | |
2141 | |
2152 | 2142 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2143 | |
2144 _cleanup_list.verify_optional(); | |
2361 | 2145 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2146 |
2147 if (G1ConcRegionFreeingVerbose) { | |
2148 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
2149 "cleanup list has "SIZE_FORMAT" entries", | |
2150 _cleanup_list.length()); | |
2151 } | |
2152 | |
2153 // Noone else should be accessing the _cleanup_list at this point, | |
2154 // so it's not necessary to take any locks | |
2155 while (!_cleanup_list.is_empty()) { | |
2156 HeapRegion* hr = _cleanup_list.remove_head(); | |
2157 assert(hr != NULL, "the list was not empty"); | |
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2158 hr->par_clear(); |
2361 | 2159 tmp_free_list.add_as_tail(hr); |
2152 | 2160 |
2161 // Instead of adding one region at a time to the secondary_free_list, | |
2162 // we accumulate them in the local list and move them a few at a | |
2163 // time. This also cuts down on the number of notify_all() calls | |
2164 // we do during this process. We'll also append the local list when | |
2165 // _cleanup_list is empty (which means we just removed the last | |
2166 // region from the _cleanup_list). | |
2361 | 2167 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2168 _cleanup_list.is_empty()) { |
2169 if (G1ConcRegionFreeingVerbose) { | |
2170 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
2171 "appending "SIZE_FORMAT" entries to the " | |
2172 "secondary_free_list, clean list still has " | |
2173 SIZE_FORMAT" entries", | |
2361 | 2174 tmp_free_list.length(), |
2152 | 2175 _cleanup_list.length()); |
342 | 2176 } |
2152 | 2177 |
2178 { | |
2179 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 2180 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 2181 SecondaryFreeList_lock->notify_all(); |
2182 } | |
2183 | |
2184 if (G1StressConcRegionFreeing) { | |
2185 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2186 os::sleep(Thread::current(), (jlong) 1, false); | |
2187 } | |
2188 } | |
342 | 2189 } |
2190 } | |
2361 | 2191 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2192 } |
2193 | |
2174
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2194 // Support closures for reference procssing in G1 |
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2195 |
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2196 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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2197 HeapWord* addr = (HeapWord*)obj; |
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2198 return addr != NULL && |
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2199 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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2200 } |
342 | 2201 |
2202 class G1CMKeepAliveClosure: public OopClosure { | |
2203 G1CollectedHeap* _g1; | |
2204 ConcurrentMark* _cm; | |
2205 public: | |
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2206 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
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2207 _g1(g1), _cm(cm) { |
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2208 assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
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2209 } |
342 | 2210 |
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2211 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2212 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2213 |
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2214 template <class T> void do_oop_work(T* p) { |
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2215 oop obj = oopDesc::load_decode_heap_oop(p); |
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2216 HeapWord* addr = (HeapWord*)obj; |
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2217 |
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2218 if (_cm->verbose_high()) { |
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2219 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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2220 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2221 p, (void*) obj); |
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2222 } |
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2223 |
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2224 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
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2225 _cm->mark_and_count(obj); |
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2226 _cm->mark_stack_push(obj); |
342 | 2227 } |
2228 } | |
2229 }; | |
2230 | |
2231 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
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2232 ConcurrentMark* _cm; |
342 | 2233 CMMarkStack* _markStack; |
2234 G1CMKeepAliveClosure* _oopClosure; | |
2235 public: | |
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2236 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
342 | 2237 G1CMKeepAliveClosure* oopClosure) : |
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2238 _cm(cm), |
342 | 2239 _markStack(markStack), |
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2240 _oopClosure(oopClosure) { } |
342 | 2241 |
2242 void do_void() { | |
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2243 _markStack->drain((OopClosure*)_oopClosure, _cm->nextMarkBitMap(), false); |
342 | 2244 } |
2245 }; | |
2246 | |
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2247 // 'Keep Alive' closure used by parallel reference processing. |
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2248 // An instance of this closure is used in the parallel reference processing |
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2249 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2250 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2251 // placed on to discovered ref lists once so we can mark and push with no |
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2252 // need to check whether the object has already been marked. Using the |
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2253 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2254 // operating on the global mark stack. This means that an individual |
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2255 // worker would be doing lock-free pushes while it processes its own |
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2256 // discovered ref list followed by drain call. If the discovered ref lists |
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2257 // are unbalanced then this could cause interference with the other |
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2258 // workers. Using a CMTask (and its embedded local data structures) |
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2259 // avoids that potential interference. |
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2260 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2261 ConcurrentMark* _cm; |
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2262 CMTask* _task; |
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2263 int _ref_counter_limit; |
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2264 int _ref_counter; |
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2265 public: |
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2266 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2267 _cm(cm), _task(task), |
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2268 _ref_counter_limit(G1RefProcDrainInterval) { |
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2269 assert(_ref_counter_limit > 0, "sanity"); |
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2270 _ref_counter = _ref_counter_limit; |
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2271 } |
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2272 |
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2273 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2274 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2275 |
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2276 template <class T> void do_oop_work(T* p) { |
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2277 if (!_cm->has_overflown()) { |
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2278 oop obj = oopDesc::load_decode_heap_oop(p); |
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2279 if (_cm->verbose_high()) { |
2174
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2280 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2281 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2282 _task->task_id(), p, (void*) obj); |
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2283 } |
2174
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2284 |
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2285 _task->deal_with_reference(obj); |
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2286 _ref_counter--; |
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2287 |
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2288 if (_ref_counter == 0) { |
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2289 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2290 // reachable from them on to the local stack (and possibly the global stack). |
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2291 // Call do_marking_step() to process these entries. We call the routine in a |
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2292 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2293 // with the entries that we've pushed as a result of the deal_with_reference |
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2294 // calls above) or we overflow. |
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2295 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2296 // while there may still be some work to do. (See the comment at the |
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2297 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2298 // is reaching the specified time target.) It is only when |
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2299 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2300 // that the marking has completed. |
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2301 do { |
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2302 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2303 _task->do_marking_step(mark_step_duration_ms, |
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2304 false /* do_stealing */, |
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|
2305 false /* do_termination */); |
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2306 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2307 _ref_counter = _ref_counter_limit; |
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|
2308 } |
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2309 } else { |
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2310 if (_cm->verbose_high()) { |
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2311 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
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2312 } |
2174
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2313 } |
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2314 } |
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|
2315 }; |
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|
2316 |
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2317 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
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2318 ConcurrentMark* _cm; |
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2319 CMTask* _task; |
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2320 public: |
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|
2321 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
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2322 _cm(cm), _task(task) { } |
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2323 |
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|
2324 void do_void() { |
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2325 do { |
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2326 if (_cm->verbose_high()) { |
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|
2327 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
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2328 _task->task_id()); |
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2329 } |
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2330 |
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2331 // We call CMTask::do_marking_step() to completely drain the local and |
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2332 // global marking stacks. The routine is called in a loop, which we'll |
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2333 // exit if there's nothing more to do (i.e. we'completely drained the |
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2334 // entries that were pushed as a result of applying the |
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2335 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
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|
2336 // lists above) or we overflow the global marking stack. |
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2337 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2338 // while there may still be some work to do. (See the comment at the |
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2339 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2340 // is reaching the specified time target.) It is only when |
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2341 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2342 // that the marking has completed. |
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|
2343 |
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2344 _task->do_marking_step(1000000000.0 /* something very large */, |
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2345 true /* do_stealing */, |
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|
2346 true /* do_termination */); |
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2347 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2348 } |
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2349 }; |
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|
2350 |
3979
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2351 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2352 // reference processing at the end of G1 concurrent marking |
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2353 |
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2354 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2355 private: |
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2356 G1CollectedHeap* _g1h; |
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2357 ConcurrentMark* _cm; |
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2358 WorkGang* _workers; |
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2359 int _active_workers; |
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2360 |
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2361 public: |
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2362 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
2174
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2363 ConcurrentMark* cm, |
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2364 WorkGang* workers, |
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2365 int n_workers) : |
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2366 _g1h(g1h), _cm(cm), |
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2367 _workers(workers), _active_workers(n_workers) { } |
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2368 |
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2369 // Executes the given task using concurrent marking worker threads. |
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2370 virtual void execute(ProcessTask& task); |
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2371 virtual void execute(EnqueueTask& task); |
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2372 }; |
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2373 |
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2374 class G1CMRefProcTaskProxy: public AbstractGangTask { |
2174
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2375 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2376 ProcessTask& _proc_task; |
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2377 G1CollectedHeap* _g1h; |
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2378 ConcurrentMark* _cm; |
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2379 |
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2380 public: |
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2381 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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2382 G1CollectedHeap* g1h, |
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2383 ConcurrentMark* cm) : |
2174
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2384 AbstractGangTask("Process reference objects in parallel"), |
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2385 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
2174
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2386 |
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2387 virtual void work(uint worker_id) { |
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2388 CMTask* marking_task = _cm->task(worker_id); |
2174
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2389 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2390 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
2174
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2391 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2392 |
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2393 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
2174
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2394 } |
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2395 }; |
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2396 |
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2397 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
2174
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2398 assert(_workers != NULL, "Need parallel worker threads."); |
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2399 |
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2400 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
2174
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2401 |
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2402 // We need to reset the phase for each task execution so that |
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2403 // the termination protocol of CMTask::do_marking_step works. |
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2404 _cm->set_phase(_active_workers, false /* concurrent */); |
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2405 _g1h->set_par_threads(_active_workers); |
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2406 _workers->run_task(&proc_task_proxy); |
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|
2407 _g1h->set_par_threads(0); |
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|
2408 } |
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2409 |
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2410 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
2174
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2411 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
2412 EnqueueTask& _enq_task; |
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2413 |
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|
2414 public: |
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2415 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
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2416 AbstractGangTask("Enqueue reference objects in parallel"), |
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2417 _enq_task(enq_task) { } |
2174
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2418 |
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2419 virtual void work(uint worker_id) { |
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|
2420 _enq_task.work(worker_id); |
2174
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|
2421 } |
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|
2422 }; |
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|
2423 |
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|
2424 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
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|
2425 assert(_workers != NULL, "Need parallel worker threads."); |
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|
2426 |
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|
2427 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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|
2428 |
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|
2429 _g1h->set_par_threads(_active_workers); |
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|
2430 _workers->run_task(&enq_task_proxy); |
234761c55641
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|
2431 _g1h->set_par_threads(0); |
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|
2432 } |
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|
2433 |
342 | 2434 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
2435 ResourceMark rm; | |
2436 HandleMark hm; | |
3975
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|
2437 |
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|
2438 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
2439 |
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|
2440 // Is alive closure. |
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|
2441 G1CMIsAliveClosure g1_is_alive(g1h); |
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|
2442 |
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|
2443 // Inner scope to exclude the cleaning of the string and symbol |
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|
2444 // tables from the displayed time. |
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|
2445 { |
6007
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diff
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|
2446 if (G1Log::finer()) { |
3975
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|
2447 gclog_or_tty->put(' '); |
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|
2448 } |
6007
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brutisso
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diff
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|
2449 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
3975
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|
2450 |
3979
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|
2451 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
3975
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|
2452 |
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|
2453 // See the comment in G1CollectedHeap::ref_processing_init() |
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|
2454 // about how reference processing currently works in G1. |
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|
2455 |
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|
2456 // Process weak references. |
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|
2457 rp->setup_policy(clear_all_soft_refs); |
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|
2458 assert(_markStack.isEmpty(), "mark stack should be empty"); |
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|
2459 |
4836
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|
2460 G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
3975
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|
2461 G1CMDrainMarkingStackClosure |
4836
d30fa85f9994
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|
2462 g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
3975
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|
2463 |
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|
2464 // We use the work gang from the G1CollectedHeap and we utilize all |
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|
2465 // the worker threads. |
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|
2466 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
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|
2467 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
3975
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|
2468 |
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|
2469 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
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|
2470 g1h->workers(), active_workers); |
3975
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|
2471 |
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|
2472 if (rp->processing_is_mt()) { |
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|
2473 // Set the degree of MT here. If the discovery is done MT, there |
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|
2474 // may have been a different number of threads doing the discovery |
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diff
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|
2475 // and a different number of discovered lists may have Ref objects. |
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diff
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|
2476 // That is OK as long as the Reference lists are balanced (see |
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diff
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|
2477 // balance_all_queues() and balance_queues()). |
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|
2478 rp->set_active_mt_degree(active_workers); |
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|
2479 |
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|
2480 rp->process_discovered_references(&g1_is_alive, |
2174
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|
2481 &g1_keep_alive, |
234761c55641
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changeset
|
2482 &g1_drain_mark_stack, |
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|
2483 &par_task_executor); |
234761c55641
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|
2484 |
3975
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|
2485 // The work routines of the parallel keep_alive and drain_marking_stack |
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changeset
|
2486 // will set the has_overflown flag if we overflow the global marking |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2487 // stack. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2488 } else { |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2489 rp->process_discovered_references(&g1_is_alive, |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2490 &g1_keep_alive, |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2491 &g1_drain_mark_stack, |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2492 NULL); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2493 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2494 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2495 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2496 "mark stack should be empty (unless it overflowed)"); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2497 if (_markStack.overflow()) { |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2498 // Should have been done already when we tried to push an |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2499 // entry on to the global mark stack. But let's do it again. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2500 set_has_overflown(); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2501 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2502 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2503 if (rp->processing_is_mt()) { |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2504 assert(rp->num_q() == active_workers, "why not"); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2505 rp->enqueue_discovered_references(&par_task_executor); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2506 } else { |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2507 rp->enqueue_discovered_references(); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2508 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2509 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2510 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2511 assert(!rp->discovery_enabled(), "Post condition"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2512 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2513 |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2514 // Now clean up stale oops in StringTable |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2515 StringTable::unlink(&g1_is_alive); |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2516 // Clean up unreferenced symbols in symbol table. |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2517 SymbolTable::unlink(); |
342 | 2518 } |
2519 | |
2520 void ConcurrentMark::swapMarkBitMaps() { | |
2521 CMBitMapRO* temp = _prevMarkBitMap; | |
2522 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2523 _nextMarkBitMap = (CMBitMap*) temp; | |
2524 } | |
2525 | |
2526 class CMRemarkTask: public AbstractGangTask { | |
2527 private: | |
2528 ConcurrentMark *_cm; | |
2529 | |
2530 public: | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2531 void work(uint worker_id) { |
342 | 2532 // Since all available tasks are actually started, we should |
2533 // only proceed if we're supposed to be actived. | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2534 if (worker_id < _cm->active_tasks()) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2535 CMTask* task = _cm->task(worker_id); |
342 | 2536 task->record_start_time(); |
2537 do { | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2538 task->do_marking_step(1000000000.0 /* something very large */, |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2539 true /* do_stealing */, |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2540 true /* do_termination */); |
342 | 2541 } while (task->has_aborted() && !_cm->has_overflown()); |
2542 // If we overflow, then we do not want to restart. We instead | |
2543 // want to abort remark and do concurrent marking again. | |
2544 task->record_end_time(); | |
2545 } | |
2546 } | |
2547 | |
4711 | 2548 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2549 AbstractGangTask("Par Remark"), _cm(cm) { |
4711 | 2550 _cm->terminator()->reset_for_reuse(active_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2551 } |
342 | 2552 }; |
2553 | |
2554 void ConcurrentMark::checkpointRootsFinalWork() { | |
2555 ResourceMark rm; | |
2556 HandleMark hm; | |
2557 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2558 | |
2559 g1h->ensure_parsability(false); | |
2560 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2561 if (G1CollectedHeap::use_parallel_gc_threads()) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2562 G1CollectedHeap::StrongRootsScope srs(g1h); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2563 // this is remark, so we'll use up all active threads |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2564 uint active_workers = g1h->workers()->active_workers(); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2565 if (active_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2566 assert(active_workers > 0, "Should have been set earlier"); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2567 active_workers = (uint) ParallelGCThreads; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2568 g1h->workers()->set_active_workers(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2569 } |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2570 set_phase(active_workers, false /* concurrent */); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2571 // Leave _parallel_marking_threads at it's |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2572 // value originally calculated in the ConcurrentMark |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2573 // constructor and pass values of the active workers |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2574 // through the gang in the task. |
342 | 2575 |
4711 | 2576 CMRemarkTask remarkTask(this, active_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2577 g1h->set_par_threads(active_workers); |
342 | 2578 g1h->workers()->run_task(&remarkTask); |
2579 g1h->set_par_threads(0); | |
2580 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2581 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2582 // this is remark, so we'll use up all available threads |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2583 uint active_workers = 1; |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2584 set_phase(active_workers, false /* concurrent */); |
342 | 2585 |
4711 | 2586 CMRemarkTask remarkTask(this, active_workers); |
342 | 2587 // We will start all available threads, even if we decide that the |
2588 // active_workers will be fewer. The extra ones will just bail out | |
2589 // immediately. | |
2590 remarkTask.work(0); | |
2591 } | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2592 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2593 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2594 |
2595 print_stats(); | |
2596 | |
2597 #if VERIFY_OBJS_PROCESSED | |
2598 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
2599 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
2600 _scan_obj_cl.objs_processed, | |
2601 ThreadLocalObjQueue::objs_enqueued); | |
2602 guarantee(_scan_obj_cl.objs_processed == | |
2603 ThreadLocalObjQueue::objs_enqueued, | |
2604 "Different number of objs processed and enqueued."); | |
2605 } | |
2606 #endif | |
2607 } | |
2608 | |
1044 | 2609 #ifndef PRODUCT |
2610 | |
1388 | 2611 class PrintReachableOopClosure: public OopClosure { |
342 | 2612 private: |
2613 G1CollectedHeap* _g1h; | |
2614 outputStream* _out; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2615 VerifyOption _vo; |
1388 | 2616 bool _all; |
342 | 2617 |
2618 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2619 PrintReachableOopClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2620 VerifyOption vo, |
1388 | 2621 bool all) : |
1044 | 2622 _g1h(G1CollectedHeap::heap()), |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2623 _out(out), _vo(vo), _all(all) { } |
342 | 2624 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2625 void do_oop(narrowOop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2626 void do_oop( oop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2627 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2628 template <class T> void do_oop_work(T* p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2629 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2630 const char* str = NULL; |
2631 const char* str2 = ""; | |
2632 | |
1388 | 2633 if (obj == NULL) { |
2634 str = ""; | |
2635 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2636 str = " O"; | |
2637 } else { | |
342 | 2638 HeapRegion* hr = _g1h->heap_region_containing(obj); |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2639 guarantee(hr != NULL, "invariant"); |
1044 | 2640 bool over_tams = false; |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2641 bool marked = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2642 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2643 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2644 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2645 over_tams = hr->obj_allocated_since_prev_marking(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2646 marked = _g1h->isMarkedPrev(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2647 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2648 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2649 over_tams = hr->obj_allocated_since_next_marking(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2650 marked = _g1h->isMarkedNext(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2651 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2652 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2653 marked = obj->is_gc_marked(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2654 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2655 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2656 ShouldNotReachHere(); |
1044 | 2657 } |
2658 | |
2659 if (over_tams) { | |
1388 | 2660 str = " >"; |
2661 if (marked) { | |
342 | 2662 str2 = " AND MARKED"; |
1044 | 2663 } |
1388 | 2664 } else if (marked) { |
2665 str = " M"; | |
1044 | 2666 } else { |
1388 | 2667 str = " NOT"; |
1044 | 2668 } |
342 | 2669 } |
2670 | |
1388 | 2671 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2672 p, (void*) obj, str, str2); |
2673 } | |
2674 }; | |
2675 | |
1388 | 2676 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2677 private: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2678 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2679 outputStream* _out; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2680 VerifyOption _vo; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2681 bool _all; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2682 HeapRegion* _hr; |
342 | 2683 |
2684 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2685 PrintReachableObjectClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2686 VerifyOption vo, |
1388 | 2687 bool all, |
2688 HeapRegion* hr) : | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2689 _g1h(G1CollectedHeap::heap()), |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2690 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2691 |
2692 void do_object(oop o) { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2693 bool over_tams = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2694 bool marked = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2695 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2696 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2697 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2698 over_tams = _hr->obj_allocated_since_prev_marking(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2699 marked = _g1h->isMarkedPrev(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2700 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2701 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2702 over_tams = _hr->obj_allocated_since_next_marking(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
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|
2703 marked = _g1h->isMarkedNext(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2704 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2705 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2706 marked = o->is_gc_marked(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2707 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2708 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2709 ShouldNotReachHere(); |
1388 | 2710 } |
2711 bool print_it = _all || over_tams || marked; | |
2712 | |
2713 if (print_it) { | |
2714 _out->print_cr(" "PTR_FORMAT"%s", | |
2715 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2716 PrintReachableOopClosure oopCl(_out, _vo, _all); |
1388 | 2717 o->oop_iterate(&oopCl); |
2718 } | |
342 | 2719 } |
2720 }; | |
2721 | |
1388 | 2722 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2723 private: |
2724 outputStream* _out; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2725 VerifyOption _vo; |
1388 | 2726 bool _all; |
342 | 2727 |
2728 public: | |
2729 bool doHeapRegion(HeapRegion* hr) { | |
2730 HeapWord* b = hr->bottom(); | |
2731 HeapWord* e = hr->end(); | |
2732 HeapWord* t = hr->top(); | |
1044 | 2733 HeapWord* p = NULL; |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2734 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2735 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2736 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
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diff
changeset
|
2737 p = hr->prev_top_at_mark_start(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2738 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2739 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
2740 p = hr->next_top_at_mark_start(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2741 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2742 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2743 // When we are verifying marking using the mark word |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2744 // TAMS has no relevance. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2745 assert(p == NULL, "post-condition"); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2746 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2747 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2748 ShouldNotReachHere(); |
1044 | 2749 } |
342 | 2750 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2751 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2752 _out->cr(); |
2753 | |
2754 HeapWord* from = b; | |
2755 HeapWord* to = t; | |
2756 | |
2757 if (to > from) { | |
2758 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2759 _out->cr(); | |
3772
6747fd0512e0
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johnc
parents:
3771
diff
changeset
|
2760 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2761 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2762 _out->cr(); | |
2763 } | |
342 | 2764 |
2765 return false; | |
2766 } | |
2767 | |
3772
6747fd0512e0
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johnc
parents:
3771
diff
changeset
|
2768 PrintReachableRegionClosure(outputStream* out, |
6747fd0512e0
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johnc
parents:
3771
diff
changeset
|
2769 VerifyOption vo, |
1388 | 2770 bool all) : |
3772
6747fd0512e0
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johnc
parents:
3771
diff
changeset
|
2771 _out(out), _vo(vo), _all(all) { } |
342 | 2772 }; |
2773 | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2774 static const char* verify_option_to_tams(VerifyOption vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2775 switch (vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2776 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2777 return "PTAMS"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2778 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2779 return "NTAMS"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2780 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2781 return "NONE"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2782 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2783 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2784 |
1388 | 2785 void ConcurrentMark::print_reachable(const char* str, |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2786 VerifyOption vo, |
1388 | 2787 bool all) { |
2788 gclog_or_tty->cr(); | |
2789 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2790 |
2791 if (G1PrintReachableBaseFile == NULL) { | |
2792 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2793 return; | |
2794 } | |
2795 | |
2796 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2797 (JVM_MAXPATHLEN - 1)) { | |
2798 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2799 return; | |
2800 } | |
2801 | |
2802 char file_name[JVM_MAXPATHLEN]; | |
2803 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2804 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2805 | |
2806 fileStream fout(file_name); | |
2807 if (!fout.is_open()) { | |
2808 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2809 return; | |
2810 } | |
2811 | |
2812 outputStream* out = &fout; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2813 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
1044 | 2814 out->cr(); |
2815 | |
1388 | 2816 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2817 out->cr(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2818 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2819 _g1h->heap_region_iterate(&rcl); |
1044 | 2820 out->cr(); |
2821 | |
2822 gclog_or_tty->print_cr(" done"); | |
1388 | 2823 gclog_or_tty->flush(); |
342 | 2824 } |
2825 | |
1044 | 2826 #endif // PRODUCT |
2827 | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2828 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2829 // Note we are overriding the read-only view of the prev map here, via |
2830 // the cast. | |
2831 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2832 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2833 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2834 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2835 _nextMarkBitMap->clearRange(mr); |
2836 } | |
2837 | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2838 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2839 clearRangePrevBitmap(mr); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2840 clearRangeNextBitmap(mr); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2841 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2842 |
342 | 2843 HeapRegion* |
2844 ConcurrentMark::claim_region(int task_num) { | |
2845 // "checkpoint" the finger | |
2846 HeapWord* finger = _finger; | |
2847 | |
2848 // _heap_end will not change underneath our feet; it only changes at | |
2849 // yield points. | |
2850 while (finger < _heap_end) { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2851 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2852 |
3771 | 2853 // Note on how this code handles humongous regions. In the |
2854 // normal case the finger will reach the start of a "starts | |
2855 // humongous" (SH) region. Its end will either be the end of the | |
2856 // last "continues humongous" (CH) region in the sequence, or the | |
2857 // standard end of the SH region (if the SH is the only region in | |
2858 // the sequence). That way claim_region() will skip over the CH | |
2859 // regions. However, there is a subtle race between a CM thread | |
2860 // executing this method and a mutator thread doing a humongous | |
2861 // object allocation. The two are not mutually exclusive as the CM | |
2862 // thread does not need to hold the Heap_lock when it gets | |
2863 // here. So there is a chance that claim_region() will come across | |
2864 // a free region that's in the progress of becoming a SH or a CH | |
2865 // region. In the former case, it will either | |
2866 // a) Miss the update to the region's end, in which case it will | |
2867 // visit every subsequent CH region, will find their bitmaps | |
2868 // empty, and do nothing, or | |
2869 // b) Will observe the update of the region's end (in which case | |
2870 // it will skip the subsequent CH regions). | |
2871 // If it comes across a region that suddenly becomes CH, the | |
2872 // scenario will be similar to b). So, the race between | |
2873 // claim_region() and a humongous object allocation might force us | |
2874 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2875 // iterations) but it should not introduce and correctness issues. | |
2876 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2877 HeapWord* bottom = curr_region->bottom(); |
2878 HeapWord* end = curr_region->end(); | |
2879 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2880 | |
3771 | 2881 if (verbose_low()) { |
342 | 2882 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
2883 "["PTR_FORMAT", "PTR_FORMAT"), " | |
2884 "limit = "PTR_FORMAT, | |
2885 task_num, curr_region, bottom, end, limit); | |
3771 | 2886 } |
2887 | |
2888 // Is the gap between reading the finger and doing the CAS too long? | |
2889 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2890 if (res == finger) { |
2891 // we succeeded | |
2892 | |
2893 // notice that _finger == end cannot be guaranteed here since, | |
2894 // someone else might have moved the finger even further | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2895 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2896 |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2897 if (verbose_low()) { |
342 | 2898 gclog_or_tty->print_cr("[%d] we were successful with region = " |
2899 PTR_FORMAT, task_num, curr_region); | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2900 } |
342 | 2901 |
2902 if (limit > bottom) { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2903 if (verbose_low()) { |
342 | 2904 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
2905 "returning it ", task_num, curr_region); | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2906 } |
342 | 2907 return curr_region; |
2908 } else { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2909 assert(limit == bottom, |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2910 "the region limit should be at bottom"); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2911 if (verbose_low()) { |
342 | 2912 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
2913 "returning NULL", task_num, curr_region); | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2914 } |
342 | 2915 // we return NULL and the caller should try calling |
2916 // claim_region() again. | |
2917 return NULL; | |
2918 } | |
2919 } else { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2920 assert(_finger > finger, "the finger should have moved forward"); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2921 if (verbose_low()) { |
342 | 2922 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
2923 "global finger = "PTR_FORMAT", " | |
2924 "our finger = "PTR_FORMAT, | |
2925 task_num, _finger, finger); | |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
2926 } |
342 | 2927 |
2928 // read it again | |
2929 finger = _finger; | |
2930 } | |
2931 } | |
2932 | |
2933 return NULL; | |
2934 } | |
2935 | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2936 #ifndef PRODUCT |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2937 enum VerifyNoCSetOopsPhase { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2938 VerifyNoCSetOopsStack, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2939 VerifyNoCSetOopsQueues, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2940 VerifyNoCSetOopsSATBCompleted, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2941 VerifyNoCSetOopsSATBThread |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2942 }; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
2943 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2944 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2945 private: |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2946 G1CollectedHeap* _g1h; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2947 VerifyNoCSetOopsPhase _phase; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2948 int _info; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2949 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2950 const char* phase_str() { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2951 switch (_phase) { |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
2952 case VerifyNoCSetOopsStack: return "Stack"; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2953 case VerifyNoCSetOopsQueues: return "Queue"; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2954 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2955 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2956 default: ShouldNotReachHere(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2957 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
2958 return NULL; |
2ace1c4ee8da
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parents:
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|
2959 } |
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|
2960 |
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|
2961 void do_object_work(oop obj) { |
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|
2962 guarantee(!_g1h->obj_in_cs(obj), |
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|
2963 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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|
2964 (void*) obj, phase_str(), _info)); |
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|
2965 } |
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|
2966 |
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|
2967 public: |
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|
2968 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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|
2969 |
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|
2970 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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|
2971 _phase = phase; |
2ace1c4ee8da
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|
2972 _info = info; |
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|
2973 } |
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|
2974 |
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|
2975 virtual void do_oop(oop* p) { |
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|
2976 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
2977 do_object_work(obj); |
2ace1c4ee8da
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|
2978 } |
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|
2979 |
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|
2980 virtual void do_oop(narrowOop* p) { |
2ace1c4ee8da
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|
2981 // We should not come across narrow oops while scanning marking |
2ace1c4ee8da
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|
2982 // stacks and SATB buffers. |
2ace1c4ee8da
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|
2983 ShouldNotReachHere(); |
2ace1c4ee8da
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|
2984 } |
2ace1c4ee8da
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|
2985 |
2ace1c4ee8da
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|
2986 virtual void do_object(oop obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
2987 do_object_work(obj); |
2ace1c4ee8da
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|
2988 } |
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|
2989 }; |
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|
2990 |
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|
2991 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
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|
2992 bool verify_enqueued_buffers, |
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|
2993 bool verify_thread_buffers, |
2ace1c4ee8da
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|
2994 bool verify_fingers) { |
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|
2995 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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|
2996 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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|
2997 return; |
342 | 2998 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
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|
2999 |
4787
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|
3000 VerifyNoCSetOopsClosure cl; |
2ace1c4ee8da
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|
3001 |
2ace1c4ee8da
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diff
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|
3002 if (verify_stacks) { |
2ace1c4ee8da
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diff
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|
3003 // Verify entries on the global mark stack |
2ace1c4ee8da
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|
3004 cl.set_phase(VerifyNoCSetOopsStack); |
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parents:
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diff
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|
3005 _markStack.oops_do(&cl); |
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parents:
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|
3006 |
2ace1c4ee8da
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|
3007 // Verify entries on the task queues |
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|
3008 for (int i = 0; i < (int) _max_task_num; i += 1) { |
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|
3009 cl.set_phase(VerifyNoCSetOopsQueues, i); |
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parents:
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|
3010 OopTaskQueue* queue = _task_queues->queue(i); |
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parents:
4783
diff
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|
3011 queue->oops_do(&cl); |
2ace1c4ee8da
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tonyp
parents:
4783
diff
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|
3012 } |
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parents:
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diff
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|
3013 } |
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parents:
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diff
changeset
|
3014 |
2ace1c4ee8da
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parents:
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diff
changeset
|
3015 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
2ace1c4ee8da
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parents:
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|
3016 |
2ace1c4ee8da
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changeset
|
3017 // Verify entries on the enqueued SATB buffers |
2ace1c4ee8da
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parents:
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diff
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|
3018 if (verify_enqueued_buffers) { |
2ace1c4ee8da
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parents:
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|
3019 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
3020 satb_qs.iterate_completed_buffers_read_only(&cl); |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3021 } |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3022 |
2ace1c4ee8da
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diff
changeset
|
3023 // Verify entries on the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3024 if (verify_thread_buffers) { |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3025 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3026 satb_qs.iterate_thread_buffers_read_only(&cl); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3027 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3028 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
3029 if (verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3030 // Verify the global finger |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3031 HeapWord* global_finger = finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
3032 if (global_finger != NULL && global_finger < _heap_end) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3033 // The global finger always points to a heap region boundary. We |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3034 // use heap_region_containing_raw() to get the containing region |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3035 // given that the global finger could be pointing to a free region |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3036 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3037 // happens, heap_region_containing() will return the bottom of the |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3038 // corresponding starts humongous region and the check below will |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3039 // not hold any more. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3040 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3041 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3042 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3043 global_finger, HR_FORMAT_PARAMS(global_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3044 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3045 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3046 // Verify the task fingers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3047 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3048 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3049 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3050 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3051 if (task_finger != NULL && task_finger < _heap_end) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3052 // See above note on the global finger verification. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3053 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3054 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3055 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3056 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3057 task_finger, HR_FORMAT_PARAMS(task_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3058 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3059 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3060 } |
342 | 3061 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3062 #endif // PRODUCT |
342 | 3063 |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3064 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
342 | 3065 _markStack.setEmpty(); |
3066 _markStack.clear_overflow(); | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3067 if (clear_overflow) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3068 clear_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3069 } else { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3070 assert(has_overflown(), "pre-condition"); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3071 } |
342 | 3072 _finger = _heap_start; |
3073 | |
3074 for (int i = 0; i < (int)_max_task_num; ++i) { | |
3075 OopTaskQueue* queue = _task_queues->queue(i); | |
3076 queue->set_empty(); | |
3077 } | |
3078 } | |
3079 | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3080 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3081 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3082 class AggregateCountDataHRClosure: public HeapRegionClosure { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3083 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3084 BitMap* _cm_card_bm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3085 size_t _max_task_num; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3086 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3087 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3088 AggregateCountDataHRClosure(ConcurrentMark *cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3089 BitMap* cm_card_bm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3090 size_t max_task_num) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3091 _cm(cm), _cm_card_bm(cm_card_bm), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3092 _max_task_num(max_task_num) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3093 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3094 bool is_card_aligned(HeapWord* p) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3095 return ((uintptr_t(p) & (CardTableModRefBS::card_size - 1)) == 0); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3096 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3097 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3098 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3099 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3100 // We will ignore these here and process them when their |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3101 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3102 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3103 // "starts humongous" region to have their bit set to 1 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3104 // since, due to the region chunking in the parallel region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3105 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3106 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3107 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3108 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3109 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3110 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3111 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3112 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3113 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3114 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3115 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3116 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3117 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3118 start, limit, hr->top(), hr->end())); |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3119 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3120 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3121 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3122 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3123 // NTAMS of this region has not been set so nothing to do. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3124 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3125 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3126 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3127 assert(is_card_aligned(start), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3128 assert(is_card_aligned(end), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3129 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3130 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3131 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3132 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3133 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3134 // If ntams is not card aligned then we bump the index for |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3135 // limit so that we get the card spanning ntams. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3136 if (!is_card_aligned(limit)) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3137 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3138 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3139 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3140 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3141 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3142 // Aggregate the "stripe" in the count data associated with hr. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3143 size_t hrs_index = hr->hrs_index(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3144 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3145 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3146 for (int i = 0; (size_t)i < _max_task_num; i += 1) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3147 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3148 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3149 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3150 // Fetch the marked_bytes in this region for task i and |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3151 // add it to the running total for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3152 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3153 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3154 // Now union the bitmaps[0,max_task_num)[start_idx..limit_idx) |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3155 // into the global card bitmap. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3156 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3157 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3158 while (scan_idx < limit_idx) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3159 assert(task_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3160 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3161 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3162 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3163 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3164 // its left_offset parameter is greater than its right_offset |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3165 // parameter. If does, however, have an early exit if |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3166 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3167 // passed in for left offset here. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3168 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3169 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3170 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3171 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3172 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3173 // Update the marked bytes for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3174 hr->add_to_marked_bytes(marked_bytes); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3175 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3176 // Now set the top at count to NTAMS. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3177 hr->set_top_at_conc_mark_count(limit); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3178 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3179 // Next heap region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3180 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3181 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3182 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3183 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3184 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3185 protected: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3186 G1CollectedHeap* _g1h; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3187 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3188 BitMap* _cm_card_bm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3189 size_t _max_task_num; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3190 int _active_workers; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3191 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3192 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3193 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3194 ConcurrentMark* cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3195 BitMap* cm_card_bm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3196 size_t max_task_num, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3197 int n_workers) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3198 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3199 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3200 _max_task_num(max_task_num), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3201 _active_workers(n_workers) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3202 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3203 void work(uint worker_id) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3204 AggregateCountDataHRClosure cl(_cm, _cm_card_bm, _max_task_num); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3205 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3206 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3207 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3208 _active_workers, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3209 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3210 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3211 _g1h->heap_region_iterate(&cl); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3212 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3213 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3214 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3215 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3216 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3217 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3218 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3219 _g1h->workers()->active_workers() : |
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3220 1); |
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3221 |
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3222 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
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3223 _max_task_num, n_workers); |
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3224 |
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3225 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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3226 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
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3227 "sanity check"); |
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3228 _g1h->set_par_threads(n_workers); |
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3229 _g1h->workers()->run_task(&g1_par_agg_task); |
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3230 _g1h->set_par_threads(0); |
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3231 |
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3232 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
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3233 "sanity check"); |
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3234 _g1h->reset_heap_region_claim_values(); |
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3235 } else { |
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3236 g1_par_agg_task.work(0); |
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3237 } |
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3238 } |
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3239 |
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3240 // Clear the per-worker arrays used to store the per-region counting data |
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3241 void ConcurrentMark::clear_all_count_data() { |
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3242 // Clear the global card bitmap - it will be filled during |
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3243 // liveness count aggregation (during remark) and the |
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3244 // final counting task. |
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3245 _card_bm.clear(); |
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3246 |
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3247 // Clear the global region bitmap - it will be filled as part |
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3248 // of the final counting task. |
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3249 _region_bm.clear(); |
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3250 |
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3251 size_t max_regions = _g1h->max_regions(); |
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3252 assert(_max_task_num != 0, "unitialized"); |
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3253 |
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3254 for (int i = 0; (size_t) i < _max_task_num; i += 1) { |
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3255 BitMap* task_card_bm = count_card_bitmap_for(i); |
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3256 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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3257 |
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3258 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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3259 assert(marked_bytes_array != NULL, "uninitialized"); |
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3260 |
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3261 memset(marked_bytes_array, 0, (max_regions * sizeof(size_t))); |
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3262 task_card_bm->clear(); |
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3263 } |
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3264 } |
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3265 |
342 | 3266 void ConcurrentMark::print_stats() { |
3267 if (verbose_stats()) { | |
3268 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3269 for (size_t i = 0; i < _active_tasks; ++i) { | |
3270 _tasks[i]->print_stats(); | |
3271 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3272 } | |
3273 } | |
3274 } | |
3275 | |
3276 // abandon current marking iteration due to a Full GC | |
3277 void ConcurrentMark::abort() { | |
3278 // Clear all marks to force marking thread to do nothing | |
3279 _nextMarkBitMap->clearAll(); | |
4836
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3280 // Clear the liveness counting data |
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3281 clear_all_count_data(); |
342 | 3282 // Empty mark stack |
3283 clear_marking_state(); | |
1835
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3284 for (int i = 0; i < (int)_max_task_num; ++i) { |
342 | 3285 _tasks[i]->clear_region_fields(); |
1835
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3286 } |
342 | 3287 _has_aborted = true; |
3288 | |
3289 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3290 satb_mq_set.abandon_partial_marking(); | |
1317
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3291 // This can be called either during or outside marking, we'll read |
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3292 // the expected_active value from the SATB queue set. |
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3293 satb_mq_set.set_active_all_threads( |
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3294 false, /* new active value */ |
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3295 satb_mq_set.is_active() /* expected_active */); |
342 | 3296 } |
3297 | |
3298 static void print_ms_time_info(const char* prefix, const char* name, | |
3299 NumberSeq& ns) { | |
3300 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3301 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3302 if (ns.num() > 0) { | |
3303 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3304 prefix, ns.sd(), ns.maximum()); | |
3305 } | |
3306 } | |
3307 | |
3308 void ConcurrentMark::print_summary_info() { | |
3309 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3310 print_ms_time_info(" ", "init marks", _init_times); | |
3311 print_ms_time_info(" ", "remarks", _remark_times); | |
3312 { | |
3313 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3314 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3315 | |
3316 } | |
3317 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3318 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3319 _total_counting_time, | |
3320 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3321 (double)_cleanup_times.num() | |
3322 : 0.0)); | |
3323 if (G1ScrubRemSets) { | |
3324 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3325 _total_rs_scrub_time, | |
3326 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3327 (double)_cleanup_times.num() | |
3328 : 0.0)); | |
3329 } | |
3330 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3331 (_init_times.sum() + _remark_times.sum() + | |
3332 _cleanup_times.sum())/1000.0); | |
3333 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
4836
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3334 "(%8.2f s marking).", |
342 | 3335 cmThread()->vtime_accum(), |
4836
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3336 cmThread()->vtime_mark_accum()); |
342 | 3337 } |
3338 | |
1019 | 3339 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
3340 _parallel_workers->print_worker_threads_on(st); | |
3341 } | |
3342 | |
342 | 3343 // We take a break if someone is trying to stop the world. |
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3344 bool ConcurrentMark::do_yield_check(uint worker_id) { |
342 | 3345 if (should_yield()) { |
4728
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3346 if (worker_id == 0) { |
342 | 3347 _g1h->g1_policy()->record_concurrent_pause(); |
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3348 } |
342 | 3349 cmThread()->yield(); |
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3350 if (worker_id == 0) { |
342 | 3351 _g1h->g1_policy()->record_concurrent_pause_end(); |
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3352 } |
342 | 3353 return true; |
3354 } else { | |
3355 return false; | |
3356 } | |
3357 } | |
3358 | |
3359 bool ConcurrentMark::should_yield() { | |
3360 return cmThread()->should_yield(); | |
3361 } | |
3362 | |
3363 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3364 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3365 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3366 } | |
3367 | |
3368 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3369 void* last) { | |
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3370 return containing_card_is_marked(start) && |
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3371 containing_card_is_marked(last); |
342 | 3372 } |
3373 | |
3374 #ifndef PRODUCT | |
3375 // for debugging purposes | |
3376 void ConcurrentMark::print_finger() { | |
3377 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3378 _heap_start, _heap_end, _finger); | |
3379 for (int i = 0; i < (int) _max_task_num; ++i) { | |
3380 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
3381 } | |
3382 gclog_or_tty->print_cr(""); | |
3383 } | |
3384 #endif | |
3385 | |
3771 | 3386 void CMTask::scan_object(oop obj) { |
3387 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3388 | |
3389 if (_cm->verbose_high()) { | |
3390 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
3391 _task_id, (void*) obj); | |
3392 } | |
3393 | |
3394 size_t obj_size = obj->size(); | |
3395 _words_scanned += obj_size; | |
3396 | |
3397 obj->oop_iterate(_cm_oop_closure); | |
3398 statsOnly( ++_objs_scanned ); | |
3399 check_limits(); | |
3400 } | |
3401 | |
342 | 3402 // Closure for iteration over bitmaps |
3403 class CMBitMapClosure : public BitMapClosure { | |
3404 private: | |
3405 // the bitmap that is being iterated over | |
3406 CMBitMap* _nextMarkBitMap; | |
3407 ConcurrentMark* _cm; | |
3408 CMTask* _task; | |
3409 | |
3410 public: | |
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3411 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3412 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3413 |
3414 bool do_bit(size_t offset) { | |
3415 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3416 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3417 assert( addr < _cm->finger(), "invariant"); |
342 | 3418 |
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3419 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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|
3420 assert(addr >= _task->finger(), "invariant"); |
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|
3421 |
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|
3422 // We move that task's local finger along. |
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|
3423 _task->move_finger_to(addr); |
342 | 3424 |
3425 _task->scan_object(oop(addr)); | |
3426 // we only partially drain the local queue and global stack | |
3427 _task->drain_local_queue(true); | |
3428 _task->drain_global_stack(true); | |
3429 | |
3430 // if the has_aborted flag has been raised, we need to bail out of | |
3431 // the iteration | |
3432 return !_task->has_aborted(); | |
3433 } | |
3434 }; | |
3435 | |
3436 // Closure for iterating over objects, currently only used for | |
3437 // processing SATB buffers. | |
3438 class CMObjectClosure : public ObjectClosure { | |
3439 private: | |
3440 CMTask* _task; | |
3441 | |
3442 public: | |
3443 void do_object(oop obj) { | |
3444 _task->deal_with_reference(obj); | |
3445 } | |
3446 | |
3447 CMObjectClosure(CMTask* task) : _task(task) { } | |
3448 }; | |
3449 | |
3771 | 3450 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3451 ConcurrentMark* cm, | |
3452 CMTask* task) | |
3453 : _g1h(g1h), _cm(cm), _task(task) { | |
3454 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3455 | |
3456 if (G1UseConcMarkReferenceProcessing) { | |
3979
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|
3457 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3458 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3459 } |
3771 | 3460 } |
342 | 3461 |
3462 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3463 // Separated the asserts so that we know which one fires. |
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|
3464 assert(hr != NULL, |
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|
3465 "claim_region() should have filtered out continues humongous regions"); |
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|
3466 assert(!hr->continuesHumongous(), |
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|
3467 "claim_region() should have filtered out continues humongous regions"); |
342 | 3468 |
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|
3469 if (_cm->verbose_low()) { |
342 | 3470 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
3471 _task_id, hr); | |
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3472 } |
342 | 3473 |
3474 _curr_region = hr; | |
3475 _finger = hr->bottom(); | |
3476 update_region_limit(); | |
3477 } | |
3478 | |
3479 void CMTask::update_region_limit() { | |
3480 HeapRegion* hr = _curr_region; | |
3481 HeapWord* bottom = hr->bottom(); | |
3482 HeapWord* limit = hr->next_top_at_mark_start(); | |
3483 | |
3484 if (limit == bottom) { | |
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3485 if (_cm->verbose_low()) { |
342 | 3486 gclog_or_tty->print_cr("[%d] found an empty region " |
3487 "["PTR_FORMAT", "PTR_FORMAT")", | |
3488 _task_id, bottom, limit); | |
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3489 } |
342 | 3490 // The region was collected underneath our feet. |
3491 // We set the finger to bottom to ensure that the bitmap | |
3492 // iteration that will follow this will not do anything. | |
3493 // (this is not a condition that holds when we set the region up, | |
3494 // as the region is not supposed to be empty in the first place) | |
3495 _finger = bottom; | |
3496 } else if (limit >= _region_limit) { | |
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3497 assert(limit >= _finger, "peace of mind"); |
342 | 3498 } else { |
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3499 assert(limit < _region_limit, "only way to get here"); |
342 | 3500 // This can happen under some pretty unusual circumstances. An |
3501 // evacuation pause empties the region underneath our feet (NTAMS | |
3502 // at bottom). We then do some allocation in the region (NTAMS | |
3503 // stays at bottom), followed by the region being used as a GC | |
3504 // alloc region (NTAMS will move to top() and the objects | |
3505 // originally below it will be grayed). All objects now marked in | |
3506 // the region are explicitly grayed, if below the global finger, | |
3507 // and we do not need in fact to scan anything else. So, we simply | |
3508 // set _finger to be limit to ensure that the bitmap iteration | |
3509 // doesn't do anything. | |
3510 _finger = limit; | |
3511 } | |
3512 | |
3513 _region_limit = limit; | |
3514 } | |
3515 | |
3516 void CMTask::giveup_current_region() { | |
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3517 assert(_curr_region != NULL, "invariant"); |
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3518 if (_cm->verbose_low()) { |
342 | 3519 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
3520 _task_id, _curr_region); | |
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3521 } |
342 | 3522 clear_region_fields(); |
3523 } | |
3524 | |
3525 void CMTask::clear_region_fields() { | |
3526 // Values for these three fields that indicate that we're not | |
3527 // holding on to a region. | |
3528 _curr_region = NULL; | |
3529 _finger = NULL; | |
3530 _region_limit = NULL; | |
3531 } | |
3532 | |
3771 | 3533 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3534 if (cm_oop_closure == NULL) { | |
3535 assert(_cm_oop_closure != NULL, "invariant"); | |
3536 } else { | |
3537 assert(_cm_oop_closure == NULL, "invariant"); | |
3538 } | |
3539 _cm_oop_closure = cm_oop_closure; | |
3540 } | |
3541 | |
342 | 3542 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3543 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3544 |
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3545 if (_cm->verbose_low()) { |
342 | 3546 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
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3547 } |
342 | 3548 |
3549 _nextMarkBitMap = nextMarkBitMap; | |
3550 clear_region_fields(); | |
3551 | |
3552 _calls = 0; | |
3553 _elapsed_time_ms = 0.0; | |
3554 _termination_time_ms = 0.0; | |
3555 _termination_start_time_ms = 0.0; | |
3556 | |
3557 #if _MARKING_STATS_ | |
3558 _local_pushes = 0; | |
3559 _local_pops = 0; | |
3560 _local_max_size = 0; | |
3561 _objs_scanned = 0; | |
3562 _global_pushes = 0; | |
3563 _global_pops = 0; | |
3564 _global_max_size = 0; | |
3565 _global_transfers_to = 0; | |
3566 _global_transfers_from = 0; | |
3567 _regions_claimed = 0; | |
3568 _objs_found_on_bitmap = 0; | |
3569 _satb_buffers_processed = 0; | |
3570 _steal_attempts = 0; | |
3571 _steals = 0; | |
3572 _aborted = 0; | |
3573 _aborted_overflow = 0; | |
3574 _aborted_cm_aborted = 0; | |
3575 _aborted_yield = 0; | |
3576 _aborted_timed_out = 0; | |
3577 _aborted_satb = 0; | |
3578 _aborted_termination = 0; | |
3579 #endif // _MARKING_STATS_ | |
3580 } | |
3581 | |
3582 bool CMTask::should_exit_termination() { | |
3583 regular_clock_call(); | |
3584 // This is called when we are in the termination protocol. We should | |
3585 // quit if, for some reason, this task wants to abort or the global | |
3586 // stack is not empty (this means that we can get work from it). | |
3587 return !_cm->mark_stack_empty() || has_aborted(); | |
3588 } | |
3589 | |
3590 void CMTask::reached_limit() { | |
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3591 assert(_words_scanned >= _words_scanned_limit || |
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3592 _refs_reached >= _refs_reached_limit , |
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3593 "shouldn't have been called otherwise"); |
342 | 3594 regular_clock_call(); |
3595 } | |
3596 | |
3597 void CMTask::regular_clock_call() { | |
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3598 if (has_aborted()) return; |
342 | 3599 |
3600 // First, we need to recalculate the words scanned and refs reached | |
3601 // limits for the next clock call. | |
3602 recalculate_limits(); | |
3603 | |
3604 // During the regular clock call we do the following | |
3605 | |
3606 // (1) If an overflow has been flagged, then we abort. | |
3607 if (_cm->has_overflown()) { | |
3608 set_has_aborted(); | |
3609 return; | |
3610 } | |
3611 | |
3612 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3613 // to check anything else. The other steps are only needed during | |
3614 // the concurrent marking phase. | |
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3615 if (!concurrent()) return; |
342 | 3616 |
3617 // (2) If marking has been aborted for Full GC, then we also abort. | |
3618 if (_cm->has_aborted()) { | |
3619 set_has_aborted(); | |
3620 statsOnly( ++_aborted_cm_aborted ); | |
3621 return; | |
3622 } | |
3623 | |
3624 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3625 | |
3626 // (3) If marking stats are enabled, then we update the step history. | |
3627 #if _MARKING_STATS_ | |
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3628 if (_words_scanned >= _words_scanned_limit) { |
342 | 3629 ++_clock_due_to_scanning; |
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3630 } |
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3631 if (_refs_reached >= _refs_reached_limit) { |
342 | 3632 ++_clock_due_to_marking; |
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3633 } |
342 | 3634 |
3635 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3636 _interval_start_time_ms = curr_time_ms; | |
3637 _all_clock_intervals_ms.add(last_interval_ms); | |
3638 | |
3639 if (_cm->verbose_medium()) { | |
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3640 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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3641 "scanned = %d%s, refs reached = %d%s", |
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3642 _task_id, last_interval_ms, |
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3643 _words_scanned, |
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3644 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3645 _refs_reached, |
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3646 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3647 } |
3648 #endif // _MARKING_STATS_ | |
3649 | |
3650 // (4) We check whether we should yield. If we have to, then we abort. | |
3651 if (_cm->should_yield()) { | |
3652 // We should yield. To do this we abort the task. The caller is | |
3653 // responsible for yielding. | |
3654 set_has_aborted(); | |
3655 statsOnly( ++_aborted_yield ); | |
3656 return; | |
3657 } | |
3658 | |
3659 // (5) We check whether we've reached our time quota. If we have, | |
3660 // then we abort. | |
3661 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3662 if (elapsed_time_ms > _time_target_ms) { | |
3663 set_has_aborted(); | |
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3664 _has_timed_out = true; |
342 | 3665 statsOnly( ++_aborted_timed_out ); |
3666 return; | |
3667 } | |
3668 | |
3669 // (6) Finally, we check whether there are enough completed STAB | |
3670 // buffers available for processing. If there are, we abort. | |
3671 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3672 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3673 if (_cm->verbose_low()) { |
342 | 3674 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
3675 _task_id); | |
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3676 } |
342 | 3677 // we do need to process SATB buffers, we'll abort and restart |
3678 // the marking task to do so | |
3679 set_has_aborted(); | |
3680 statsOnly( ++_aborted_satb ); | |
3681 return; | |
3682 } | |
3683 } | |
3684 | |
3685 void CMTask::recalculate_limits() { | |
3686 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3687 _words_scanned_limit = _real_words_scanned_limit; | |
3688 | |
3689 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3690 _refs_reached_limit = _real_refs_reached_limit; | |
3691 } | |
3692 | |
3693 void CMTask::decrease_limits() { | |
3694 // This is called when we believe that we're going to do an infrequent | |
3695 // operation which will increase the per byte scanned cost (i.e. move | |
3696 // entries to/from the global stack). It basically tries to decrease the | |
3697 // scanning limit so that the clock is called earlier. | |
3698 | |
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3699 if (_cm->verbose_medium()) { |
342 | 3700 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
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3701 } |
342 | 3702 |
3703 _words_scanned_limit = _real_words_scanned_limit - | |
3704 3 * words_scanned_period / 4; | |
3705 _refs_reached_limit = _real_refs_reached_limit - | |
3706 3 * refs_reached_period / 4; | |
3707 } | |
3708 | |
3709 void CMTask::move_entries_to_global_stack() { | |
3710 // local array where we'll store the entries that will be popped | |
3711 // from the local queue | |
3712 oop buffer[global_stack_transfer_size]; | |
3713 | |
3714 int n = 0; | |
3715 oop obj; | |
3716 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3717 buffer[n] = obj; | |
3718 ++n; | |
3719 } | |
3720 | |
3721 if (n > 0) { | |
3722 // we popped at least one entry from the local queue | |
3723 | |
3724 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3725 | |
3726 if (!_cm->mark_stack_push(buffer, n)) { | |
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3727 if (_cm->verbose_low()) { |
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3728 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
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3729 _task_id); |
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3730 } |
342 | 3731 set_has_aborted(); |
3732 } else { | |
3733 // the transfer was successful | |
3734 | |
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3735 if (_cm->verbose_medium()) { |
342 | 3736 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
3737 _task_id, n); | |
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3738 } |
342 | 3739 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3740 if (tmp_size > _global_max_size) { |
342 | 3741 _global_max_size = tmp_size; |
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3742 } |
342 | 3743 _global_pushes += n ); |
3744 } | |
3745 } | |
3746 | |
3747 // this operation was quite expensive, so decrease the limits | |
3748 decrease_limits(); | |
3749 } | |
3750 | |
3751 void CMTask::get_entries_from_global_stack() { | |
3752 // local array where we'll store the entries that will be popped | |
3753 // from the global stack. | |
3754 oop buffer[global_stack_transfer_size]; | |
3755 int n; | |
3756 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3757 assert(n <= global_stack_transfer_size, |
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3758 "we should not pop more than the given limit"); |
342 | 3759 if (n > 0) { |
3760 // yes, we did actually pop at least one entry | |
3761 | |
3762 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3763 if (_cm->verbose_medium()) { |
342 | 3764 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
3765 _task_id, n); | |
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3766 } |
342 | 3767 for (int i = 0; i < n; ++i) { |
3768 bool success = _task_queue->push(buffer[i]); | |
3769 // We only call this when the local queue is empty or under a | |
3770 // given target limit. So, we do not expect this push to fail. | |
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3771 assert(success, "invariant"); |
342 | 3772 } |
3773 | |
3774 statsOnly( int tmp_size = _task_queue->size(); | |
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3775 if (tmp_size > _local_max_size) { |
342 | 3776 _local_max_size = tmp_size; |
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3777 } |
342 | 3778 _local_pushes += n ); |
3779 } | |
3780 | |
3781 // this operation was quite expensive, so decrease the limits | |
3782 decrease_limits(); | |
3783 } | |
3784 | |
3785 void CMTask::drain_local_queue(bool partially) { | |
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3786 if (has_aborted()) return; |
342 | 3787 |
3788 // Decide what the target size is, depending whether we're going to | |
3789 // drain it partially (so that other tasks can steal if they run out | |
3790 // of things to do) or totally (at the very end). | |
3791 size_t target_size; | |
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3792 if (partially) { |
342 | 3793 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3794 } else { |
342 | 3795 target_size = 0; |
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3796 } |
342 | 3797 |
3798 if (_task_queue->size() > target_size) { | |
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3799 if (_cm->verbose_high()) { |
342 | 3800 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
3801 _task_id, target_size); | |
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3802 } |
342 | 3803 |
3804 oop obj; | |
3805 bool ret = _task_queue->pop_local(obj); | |
3806 while (ret) { | |
3807 statsOnly( ++_local_pops ); | |
3808 | |
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3809 if (_cm->verbose_high()) { |
342 | 3810 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
3811 (void*) obj); | |
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3812 } |
342 | 3813 |
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3814 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3815 assert(!_g1h->is_on_master_free_list( |
2152 | 3816 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3817 |
3818 scan_object(obj); | |
3819 | |
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3820 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3821 ret = false; |
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3822 } else { |
342 | 3823 ret = _task_queue->pop_local(obj); |
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3824 } |
342 | 3825 } |
3826 | |
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3827 if (_cm->verbose_high()) { |
342 | 3828 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
3829 _task_id, _task_queue->size()); | |
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3830 } |
342 | 3831 } |
3832 } | |
3833 | |
3834 void CMTask::drain_global_stack(bool partially) { | |
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3835 if (has_aborted()) return; |
342 | 3836 |
3837 // We have a policy to drain the local queue before we attempt to | |
3838 // drain the global stack. | |
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3839 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3840 |
3841 // Decide what the target size is, depending whether we're going to | |
3842 // drain it partially (so that other tasks can steal if they run out | |
3843 // of things to do) or totally (at the very end). Notice that, | |
3844 // because we move entries from the global stack in chunks or | |
3845 // because another task might be doing the same, we might in fact | |
3846 // drop below the target. But, this is not a problem. | |
3847 size_t target_size; | |
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3848 if (partially) { |
342 | 3849 target_size = _cm->partial_mark_stack_size_target(); |
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3850 } else { |
342 | 3851 target_size = 0; |
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3852 } |
342 | 3853 |
3854 if (_cm->mark_stack_size() > target_size) { | |
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3855 if (_cm->verbose_low()) { |
342 | 3856 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
3857 _task_id, target_size); | |
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3858 } |
342 | 3859 |
3860 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3861 get_entries_from_global_stack(); | |
3862 drain_local_queue(partially); | |
3863 } | |
3864 | |
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3865 if (_cm->verbose_low()) { |
342 | 3866 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
3867 _task_id, _cm->mark_stack_size()); | |
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3868 } |
342 | 3869 } |
3870 } | |
3871 | |
3872 // SATB Queue has several assumptions on whether to call the par or | |
3873 // non-par versions of the methods. this is why some of the code is | |
3874 // replicated. We should really get rid of the single-threaded version | |
3875 // of the code to simplify things. | |
3876 void CMTask::drain_satb_buffers() { | |
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3877 if (has_aborted()) return; |
342 | 3878 |
3879 // We set this so that the regular clock knows that we're in the | |
3880 // middle of draining buffers and doesn't set the abort flag when it | |
3881 // notices that SATB buffers are available for draining. It'd be | |
3882 // very counter productive if it did that. :-) | |
3883 _draining_satb_buffers = true; | |
3884 | |
3885 CMObjectClosure oc(this); | |
3886 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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3887 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3888 satb_mq_set.set_par_closure(_task_id, &oc); |
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3889 } else { |
342 | 3890 satb_mq_set.set_closure(&oc); |
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3891 } |
342 | 3892 |
3893 // This keeps claiming and applying the closure to completed buffers | |
3894 // until we run out of buffers or we need to abort. | |
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3895 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3896 while (!has_aborted() && |
3897 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
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3898 if (_cm->verbose_medium()) { |
342 | 3899 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
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3900 } |
342 | 3901 statsOnly( ++_satb_buffers_processed ); |
3902 regular_clock_call(); | |
3903 } | |
3904 } else { | |
3905 while (!has_aborted() && | |
3906 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3907 if (_cm->verbose_medium()) { |
342 | 3908 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
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3909 } |
342 | 3910 statsOnly( ++_satb_buffers_processed ); |
3911 regular_clock_call(); | |
3912 } | |
3913 } | |
3914 | |
3915 if (!concurrent() && !has_aborted()) { | |
3916 // We should only do this during remark. | |
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3917 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3918 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
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3919 } else { |
342 | 3920 satb_mq_set.iterate_closure_all_threads(); |
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3921 } |
342 | 3922 } |
3923 | |
3924 _draining_satb_buffers = false; | |
3925 | |
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3926 assert(has_aborted() || |
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3927 concurrent() || |
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3928 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3929 |
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3930 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3931 satb_mq_set.set_par_closure(_task_id, NULL); |
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3932 } else { |
342 | 3933 satb_mq_set.set_closure(NULL); |
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3934 } |
342 | 3935 |
3936 // again, this was a potentially expensive operation, decrease the | |
3937 // limits to get the regular clock call early | |
3938 decrease_limits(); | |
3939 } | |
3940 | |
3941 void CMTask::print_stats() { | |
3942 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
3943 _task_id, _calls); | |
3944 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
3945 _elapsed_time_ms, _termination_time_ms); | |
3946 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3947 _step_times_ms.num(), _step_times_ms.avg(), | |
3948 _step_times_ms.sd()); | |
3949 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3950 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3951 | |
3952 #if _MARKING_STATS_ | |
3953 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3954 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3955 _all_clock_intervals_ms.sd()); | |
3956 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3957 _all_clock_intervals_ms.maximum(), | |
3958 _all_clock_intervals_ms.sum()); | |
3959 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3960 _clock_due_to_scanning, _clock_due_to_marking); | |
3961 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3962 _objs_scanned, _objs_found_on_bitmap); | |
3963 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3964 _local_pushes, _local_pops, _local_max_size); | |
3965 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3966 _global_pushes, _global_pops, _global_max_size); | |
3967 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3968 _global_transfers_to,_global_transfers_from); | |
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3969 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 3970 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
3971 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3972 _steal_attempts, _steals); | |
3973 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3974 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3975 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3976 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3977 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3978 #endif // _MARKING_STATS_ | |
3979 } | |
3980 | |
3981 /***************************************************************************** | |
3982 | |
3983 The do_marking_step(time_target_ms) method is the building block | |
3984 of the parallel marking framework. It can be called in parallel | |
3985 with other invocations of do_marking_step() on different tasks | |
3986 (but only one per task, obviously) and concurrently with the | |
3987 mutator threads, or during remark, hence it eliminates the need | |
3988 for two versions of the code. When called during remark, it will | |
3989 pick up from where the task left off during the concurrent marking | |
3990 phase. Interestingly, tasks are also claimable during evacuation | |
3991 pauses too, since do_marking_step() ensures that it aborts before | |
3992 it needs to yield. | |
3993 | |
3994 The data structures that is uses to do marking work are the | |
3995 following: | |
3996 | |
3997 (1) Marking Bitmap. If there are gray objects that appear only | |
3998 on the bitmap (this happens either when dealing with an overflow | |
3999 or when the initial marking phase has simply marked the roots | |
4000 and didn't push them on the stack), then tasks claim heap | |
4001 regions whose bitmap they then scan to find gray objects. A | |
4002 global finger indicates where the end of the last claimed region | |
4003 is. A local finger indicates how far into the region a task has | |
4004 scanned. The two fingers are used to determine how to gray an | |
4005 object (i.e. whether simply marking it is OK, as it will be | |
4006 visited by a task in the future, or whether it needs to be also | |
4007 pushed on a stack). | |
4008 | |
4009 (2) Local Queue. The local queue of the task which is accessed | |
4010 reasonably efficiently by the task. Other tasks can steal from | |
4011 it when they run out of work. Throughout the marking phase, a | |
4012 task attempts to keep its local queue short but not totally | |
4013 empty, so that entries are available for stealing by other | |
4014 tasks. Only when there is no more work, a task will totally | |
4015 drain its local queue. | |
4016 | |
4017 (3) Global Mark Stack. This handles local queue overflow. During | |
4018 marking only sets of entries are moved between it and the local | |
4019 queues, as access to it requires a mutex and more fine-grain | |
4020 interaction with it which might cause contention. If it | |
4021 overflows, then the marking phase should restart and iterate | |
4022 over the bitmap to identify gray objects. Throughout the marking | |
4023 phase, tasks attempt to keep the global mark stack at a small | |
4024 length but not totally empty, so that entries are available for | |
4025 popping by other tasks. Only when there is no more work, tasks | |
4026 will totally drain the global mark stack. | |
4027 | |
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4028 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 4029 made available. Buffers are regularly removed from this queue |
4030 and scanned for roots, so that the queue doesn't get too | |
4031 long. During remark, all completed buffers are processed, as | |
4032 well as the filled in parts of any uncompleted buffers. | |
4033 | |
4034 The do_marking_step() method tries to abort when the time target | |
4035 has been reached. There are a few other cases when the | |
4036 do_marking_step() method also aborts: | |
4037 | |
4038 (1) When the marking phase has been aborted (after a Full GC). | |
4039 | |
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4040 (2) When a global overflow (on the global stack) has been |
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4041 triggered. Before the task aborts, it will actually sync up with |
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4042 the other tasks to ensure that all the marking data structures |
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4043 (local queues, stacks, fingers etc.) are re-initialised so that |
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4044 when do_marking_step() completes, the marking phase can |
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4045 immediately restart. |
342 | 4046 |
4047 (3) When enough completed SATB buffers are available. The | |
4048 do_marking_step() method only tries to drain SATB buffers right | |
4049 at the beginning. So, if enough buffers are available, the | |
4050 marking step aborts and the SATB buffers are processed at | |
4051 the beginning of the next invocation. | |
4052 | |
4053 (4) To yield. when we have to yield then we abort and yield | |
4054 right at the end of do_marking_step(). This saves us from a lot | |
4055 of hassle as, by yielding we might allow a Full GC. If this | |
4056 happens then objects will be compacted underneath our feet, the | |
4057 heap might shrink, etc. We save checking for this by just | |
4058 aborting and doing the yield right at the end. | |
4059 | |
4060 From the above it follows that the do_marking_step() method should | |
4061 be called in a loop (or, otherwise, regularly) until it completes. | |
4062 | |
4063 If a marking step completes without its has_aborted() flag being | |
4064 true, it means it has completed the current marking phase (and | |
4065 also all other marking tasks have done so and have all synced up). | |
4066 | |
4067 A method called regular_clock_call() is invoked "regularly" (in | |
4068 sub ms intervals) throughout marking. It is this clock method that | |
4069 checks all the abort conditions which were mentioned above and | |
4070 decides when the task should abort. A work-based scheme is used to | |
4071 trigger this clock method: when the number of object words the | |
4072 marking phase has scanned or the number of references the marking | |
4073 phase has visited reach a given limit. Additional invocations to | |
4074 the method clock have been planted in a few other strategic places | |
4075 too. The initial reason for the clock method was to avoid calling | |
4076 vtime too regularly, as it is quite expensive. So, once it was in | |
4077 place, it was natural to piggy-back all the other conditions on it | |
4078 too and not constantly check them throughout the code. | |
4079 | |
4080 *****************************************************************************/ | |
4081 | |
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4082 void CMTask::do_marking_step(double time_target_ms, |
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4083 bool do_stealing, |
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4084 bool do_termination) { |
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4085 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4086 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4087 |
342 | 4088 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
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4089 assert(_task_queues != NULL, "invariant"); |
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4090 assert(_task_queue != NULL, "invariant"); |
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4091 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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4092 |
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4093 assert(!_claimed, |
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4094 "only one thread should claim this task at any one time"); |
342 | 4095 |
4096 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4097 // possible for two threads to set the _claimed flag at the same | |
4098 // time. But it is only for debugging purposes anyway and it will | |
4099 // catch most problems. | |
4100 _claimed = true; | |
4101 | |
4102 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4103 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4104 | |
4105 double diff_prediction_ms = | |
4106 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4107 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4108 | |
4109 // set up the variables that are used in the work-based scheme to | |
4110 // call the regular clock method | |
4111 _words_scanned = 0; | |
4112 _refs_reached = 0; | |
4113 recalculate_limits(); | |
4114 | |
4115 // clear all flags | |
4116 clear_has_aborted(); | |
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4117 _has_timed_out = false; |
342 | 4118 _draining_satb_buffers = false; |
4119 | |
4120 ++_calls; | |
4121 | |
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4122 if (_cm->verbose_low()) { |
342 | 4123 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
4124 "target = %1.2lfms >>>>>>>>>>", | |
4125 _task_id, _calls, _time_target_ms); | |
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4126 } |
342 | 4127 |
4128 // Set up the bitmap and oop closures. Anything that uses them is | |
4129 // eventually called from this method, so it is OK to allocate these | |
4130 // statically. | |
4131 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4132 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4133 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4134 |
4135 if (_cm->has_overflown()) { | |
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4136 // This can happen if the mark stack overflows during a GC pause |
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4137 // and this task, after a yield point, restarts. We have to abort |
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4138 // as we need to get into the overflow protocol which happens |
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4139 // right at the end of this task. |
342 | 4140 set_has_aborted(); |
4141 } | |
4142 | |
4143 // First drain any available SATB buffers. After this, we will not | |
4144 // look at SATB buffers before the next invocation of this method. | |
4145 // If enough completed SATB buffers are queued up, the regular clock | |
4146 // will abort this task so that it restarts. | |
4147 drain_satb_buffers(); | |
4148 // ...then partially drain the local queue and the global stack | |
4149 drain_local_queue(true); | |
4150 drain_global_stack(true); | |
4151 | |
4152 do { | |
4153 if (!has_aborted() && _curr_region != NULL) { | |
4154 // This means that we're already holding on to a region. | |
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4155 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4156 "should not be NULL either"); |
342 | 4157 |
4158 // We might have restarted this task after an evacuation pause | |
4159 // which might have evacuated the region we're holding on to | |
4160 // underneath our feet. Let's read its limit again to make sure | |
4161 // that we do not iterate over a region of the heap that | |
4162 // contains garbage (update_region_limit() will also move | |
4163 // _finger to the start of the region if it is found empty). | |
4164 update_region_limit(); | |
4165 // We will start from _finger not from the start of the region, | |
4166 // as we might be restarting this task after aborting half-way | |
4167 // through scanning this region. In this case, _finger points to | |
4168 // the address where we last found a marked object. If this is a | |
4169 // fresh region, _finger points to start(). | |
4170 MemRegion mr = MemRegion(_finger, _region_limit); | |
4171 | |
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4172 if (_cm->verbose_low()) { |
342 | 4173 gclog_or_tty->print_cr("[%d] we're scanning part " |
4174 "["PTR_FORMAT", "PTR_FORMAT") " | |
4175 "of region "PTR_FORMAT, | |
4176 _task_id, _finger, _region_limit, _curr_region); | |
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4177 } |
342 | 4178 |
4179 // Let's iterate over the bitmap of the part of the | |
4180 // region that is left. | |
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4181 if (mr.is_empty() || _nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4182 // We successfully completed iterating over the region. Now, |
4183 // let's give up the region. | |
4184 giveup_current_region(); | |
4185 regular_clock_call(); | |
4186 } else { | |
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4187 assert(has_aborted(), "currently the only way to do so"); |
342 | 4188 // The only way to abort the bitmap iteration is to return |
4189 // false from the do_bit() method. However, inside the | |
4190 // do_bit() method we move the _finger to point to the | |
4191 // object currently being looked at. So, if we bail out, we | |
4192 // have definitely set _finger to something non-null. | |
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4193 assert(_finger != NULL, "invariant"); |
342 | 4194 |
4195 // Region iteration was actually aborted. So now _finger | |
4196 // points to the address of the object we last scanned. If we | |
4197 // leave it there, when we restart this task, we will rescan | |
4198 // the object. It is easy to avoid this. We move the finger by | |
4199 // enough to point to the next possible object header (the | |
4200 // bitmap knows by how much we need to move it as it knows its | |
4201 // granularity). | |
1314
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4202 assert(_finger < _region_limit, "invariant"); |
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4203 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
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4204 // Check if bitmap iteration was aborted while scanning the last object |
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4205 if (new_finger >= _region_limit) { |
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4206 giveup_current_region(); |
1314
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4207 } else { |
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4208 move_finger_to(new_finger); |
1314
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4209 } |
342 | 4210 } |
4211 } | |
4212 // At this point we have either completed iterating over the | |
4213 // region we were holding on to, or we have aborted. | |
4214 | |
4215 // We then partially drain the local queue and the global stack. | |
4216 // (Do we really need this?) | |
4217 drain_local_queue(true); | |
4218 drain_global_stack(true); | |
4219 | |
4220 // Read the note on the claim_region() method on why it might | |
4221 // return NULL with potentially more regions available for | |
4222 // claiming and why we have to check out_of_regions() to determine | |
4223 // whether we're done or not. | |
4224 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4225 // We are going to try to claim a new region. We should have | |
4226 // given up on the previous one. | |
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4227 // Separated the asserts so that we know which one fires. |
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4228 assert(_curr_region == NULL, "invariant"); |
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4229 assert(_finger == NULL, "invariant"); |
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4230 assert(_region_limit == NULL, "invariant"); |
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4231 if (_cm->verbose_low()) { |
342 | 4232 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
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4233 } |
342 | 4234 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
4235 if (claimed_region != NULL) { | |
4236 // Yes, we managed to claim one | |
4237 statsOnly( ++_regions_claimed ); | |
4238 | |
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4239 if (_cm->verbose_low()) { |
342 | 4240 gclog_or_tty->print_cr("[%d] we successfully claimed " |
4241 "region "PTR_FORMAT, | |
4242 _task_id, claimed_region); | |
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4243 } |
342 | 4244 |
4245 setup_for_region(claimed_region); | |
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4246 assert(_curr_region == claimed_region, "invariant"); |
342 | 4247 } |
4248 // It is important to call the regular clock here. It might take | |
4249 // a while to claim a region if, for example, we hit a large | |
4250 // block of empty regions. So we need to call the regular clock | |
4251 // method once round the loop to make sure it's called | |
4252 // frequently enough. | |
4253 regular_clock_call(); | |
4254 } | |
4255 | |
4256 if (!has_aborted() && _curr_region == NULL) { | |
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4257 assert(_cm->out_of_regions(), |
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4258 "at this point we should be out of regions"); |
342 | 4259 } |
4260 } while ( _curr_region != NULL && !has_aborted()); | |
4261 | |
4262 if (!has_aborted()) { | |
4263 // We cannot check whether the global stack is empty, since other | |
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4264 // tasks might be pushing objects to it concurrently. |
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|
4265 assert(_cm->out_of_regions(), |
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4266 "at this point we should be out of regions"); |
342 | 4267 |
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4268 if (_cm->verbose_low()) { |
342 | 4269 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
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4270 } |
342 | 4271 |
4272 // Try to reduce the number of available SATB buffers so that | |
4273 // remark has less work to do. | |
4274 drain_satb_buffers(); | |
4275 } | |
4276 | |
4277 // Since we've done everything else, we can now totally drain the | |
4278 // local queue and global stack. | |
4279 drain_local_queue(false); | |
4280 drain_global_stack(false); | |
4281 | |
4282 // Attempt at work stealing from other task's queues. | |
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4283 if (do_stealing && !has_aborted()) { |
342 | 4284 // We have not aborted. This means that we have finished all that |
4285 // we could. Let's try to do some stealing... | |
4286 | |
4287 // We cannot check whether the global stack is empty, since other | |
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4288 // tasks might be pushing objects to it concurrently. |
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4289 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
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4290 "only way to reach here"); |
342 | 4291 |
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4292 if (_cm->verbose_low()) { |
342 | 4293 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
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4294 } |
342 | 4295 |
4296 while (!has_aborted()) { | |
4297 oop obj; | |
4298 statsOnly( ++_steal_attempts ); | |
4299 | |
4300 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
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4301 if (_cm->verbose_medium()) { |
342 | 4302 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
4303 _task_id, (void*) obj); | |
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4304 } |
342 | 4305 |
4306 statsOnly( ++_steals ); | |
4307 | |
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4308 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
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4309 "any stolen object should be marked"); |
342 | 4310 scan_object(obj); |
4311 | |
4312 // And since we're towards the end, let's totally drain the | |
4313 // local queue and global stack. | |
4314 drain_local_queue(false); | |
4315 drain_global_stack(false); | |
4316 } else { | |
4317 break; | |
4318 } | |
4319 } | |
4320 } | |
4321 | |
3316
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4322 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
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|
4323 // should raise the overflow flag. |
cd8e33b2a8ad
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|
4324 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4325 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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|
4326 _cm->set_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4327 regular_clock_call(); |
cd8e33b2a8ad
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|
4328 } |
cd8e33b2a8ad
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|
4329 } |
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4330 |
342 | 4331 // We still haven't aborted. Now, let's try to get into the |
4332 // termination protocol. | |
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4333 if (do_termination && !has_aborted()) { |
342 | 4334 // We cannot check whether the global stack is empty, since other |
5988
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4335 // tasks might be concurrently pushing objects on it. |
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4336 // Separated the asserts so that we know which one fires. |
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4337 assert(_cm->out_of_regions(), "only way to reach here"); |
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4338 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4339 |
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4340 if (_cm->verbose_low()) { |
342 | 4341 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
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4342 } |
342 | 4343 |
4344 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
4345 // The CMTask class also extends the TerminatorTerminator class, | |
4346 // hence its should_exit_termination() method will also decide | |
4347 // whether to exit the termination protocol or not. | |
4348 bool finished = _cm->terminator()->offer_termination(this); | |
4349 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
4350 _termination_time_ms += | |
4351 termination_end_time_ms - _termination_start_time_ms; | |
4352 | |
4353 if (finished) { | |
4354 // We're all done. | |
4355 | |
4356 if (_task_id == 0) { | |
4357 // let's allow task 0 to do this | |
4358 if (concurrent()) { | |
1023
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4359 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4360 // we need to set this to false before the next |
4361 // safepoint. This way we ensure that the marking phase | |
4362 // doesn't observe any more heap expansions. | |
4363 _cm->clear_concurrent_marking_in_progress(); | |
4364 } | |
4365 } | |
4366 | |
4367 // We can now guarantee that the global stack is empty, since | |
1023
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4368 // all other tasks have finished. We separated the guarantees so |
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4369 // that, if a condition is false, we can immediately find out |
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|
4370 // which one. |
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|
4371 guarantee(_cm->out_of_regions(), "only way to reach here"); |
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|
4372 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
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4373 guarantee(_task_queue->size() == 0, "only way to reach here"); |
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4374 guarantee(!_cm->has_overflown(), "only way to reach here"); |
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4375 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4376 |
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4377 if (_cm->verbose_low()) { |
342 | 4378 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
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|
4379 } |
342 | 4380 } else { |
4381 // Apparently there's more work to do. Let's abort this task. It | |
4382 // will restart it and we can hopefully find more things to do. | |
4383 | |
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|
4384 if (_cm->verbose_low()) { |
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|
4385 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
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|
4386 _task_id); |
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|
4387 } |
342 | 4388 |
4389 set_has_aborted(); | |
4390 statsOnly( ++_aborted_termination ); | |
4391 } | |
4392 } | |
4393 | |
4394 // Mainly for debugging purposes to make sure that a pointer to the | |
4395 // closure which was statically allocated in this frame doesn't | |
4396 // escape it by accident. | |
3771 | 4397 set_cm_oop_closure(NULL); |
342 | 4398 double end_time_ms = os::elapsedVTime() * 1000.0; |
4399 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4400 // Update the step history. | |
4401 _step_times_ms.add(elapsed_time_ms); | |
4402 | |
4403 if (has_aborted()) { | |
4404 // The task was aborted for some reason. | |
4405 | |
4406 statsOnly( ++_aborted ); | |
4407 | |
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4408 if (_has_timed_out) { |
342 | 4409 double diff_ms = elapsed_time_ms - _time_target_ms; |
4410 // Keep statistics of how well we did with respect to hitting | |
4411 // our target only if we actually timed out (if we aborted for | |
4412 // other reasons, then the results might get skewed). | |
4413 _marking_step_diffs_ms.add(diff_ms); | |
4414 } | |
4415 | |
4416 if (_cm->has_overflown()) { | |
4417 // This is the interesting one. We aborted because a global | |
4418 // overflow was raised. This means we have to restart the | |
4419 // marking phase and start iterating over regions. However, in | |
4420 // order to do this we have to make sure that all tasks stop | |
4421 // what they are doing and re-initialise in a safe manner. We | |
4422 // will achieve this with the use of two barrier sync points. | |
4423 | |
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|
4424 if (_cm->verbose_low()) { |
342 | 4425 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
3776
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|
4426 } |
342 | 4427 |
4428 _cm->enter_first_sync_barrier(_task_id); | |
4429 // When we exit this sync barrier we know that all tasks have | |
4430 // stopped doing marking work. So, it's now safe to | |
4431 // re-initialise our data structures. At the end of this method, | |
4432 // task 0 will clear the global data structures. | |
4433 | |
4434 statsOnly( ++_aborted_overflow ); | |
4435 | |
4436 // We clear the local state of this task... | |
4437 clear_region_fields(); | |
4438 | |
4439 // ...and enter the second barrier. | |
4440 _cm->enter_second_sync_barrier(_task_id); | |
4441 // At this point everything has bee re-initialised and we're | |
4442 // ready to restart. | |
4443 } | |
4444 | |
4445 if (_cm->verbose_low()) { | |
4446 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
4447 "elapsed = %1.2lfms <<<<<<<<<<", | |
4448 _task_id, _time_target_ms, elapsed_time_ms); | |
3776
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|
4449 if (_cm->has_aborted()) { |
342 | 4450 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
4451 _task_id); | |
3776
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|
4452 } |
342 | 4453 } |
4454 } else { | |
3776
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|
4455 if (_cm->verbose_low()) { |
342 | 4456 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
4457 "elapsed = %1.2lfms <<<<<<<<<<", | |
4458 _task_id, _time_target_ms, elapsed_time_ms); | |
3776
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|
4459 } |
342 | 4460 } |
4461 | |
4462 _claimed = false; | |
4463 } | |
4464 | |
4465 CMTask::CMTask(int task_id, | |
4466 ConcurrentMark* cm, | |
4836
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6484965: G1: piggy-back liveness accounting phase on marking
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4830
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|
4467 size_t* marked_bytes, |
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6484965: G1: piggy-back liveness accounting phase on marking
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|
4468 BitMap* card_bm, |
342 | 4469 CMTaskQueue* task_queue, |
4470 CMTaskQueueSet* task_queues) | |
4471 : _g1h(G1CollectedHeap::heap()), | |
4472 _task_id(task_id), _cm(cm), | |
4473 _claimed(false), | |
4474 _nextMarkBitMap(NULL), _hash_seed(17), | |
4475 _task_queue(task_queue), | |
4476 _task_queues(task_queues), | |
3771 | 4477 _cm_oop_closure(NULL), |
4836
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6484965: G1: piggy-back liveness accounting phase on marking
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|
4478 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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|
4479 _card_bm(card_bm) { |
1023
11d4857fe5e1
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|
4480 guarantee(task_queue != NULL, "invariant"); |
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|
4481 guarantee(task_queues != NULL, "invariant"); |
342 | 4482 |
4483 statsOnly( _clock_due_to_scanning = 0; | |
4484 _clock_due_to_marking = 0 ); | |
4485 | |
4486 _marking_step_diffs_ms.add(0.5); | |
4487 } | |
2435
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|
4488 |
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|
4489 // These are formatting macros that are used below to ensure |
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|
4490 // consistent formatting. The *_H_* versions are used to format the |
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|
4491 // header for a particular value and they should be kept consistent |
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|
4492 // with the corresponding macro. Also note that most of the macros add |
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|
4493 // the necessary white space (as a prefix) which makes them a bit |
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|
4494 // easier to compose. |
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|
4495 |
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|
4496 // All the output lines are prefixed with this string to be able to |
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|
4497 // identify them easily in a large log file. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4498 #define G1PPRL_LINE_PREFIX "###" |
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|
4499 |
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|
4500 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
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|
4501 #ifdef _LP64 |
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|
4502 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
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|
4503 #else // _LP64 |
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|
4504 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
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|
4505 #endif // _LP64 |
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|
4506 |
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|
4507 // For per-region info |
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|
4508 #define G1PPRL_TYPE_FORMAT " %-4s" |
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|
4509 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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|
4510 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
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|
4511 #define G1PPRL_BYTE_H_FORMAT " %9s" |
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|
4512 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
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|
4513 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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|
4514 |
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|
4515 // For summary info |
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|
4516 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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|
4517 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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|
4518 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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|
4519 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4520 |
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|
4521 G1PrintRegionLivenessInfoClosure:: |
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|
4522 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
371bbc844bf1
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|
4523 : _out(out), |
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|
4524 _total_used_bytes(0), _total_capacity_bytes(0), |
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|
4525 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4526 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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|
4527 _hum_prev_live_bytes(0), _hum_next_live_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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|
4528 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
4529 MemRegion g1_committed = g1h->g1_committed(); |
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|
4530 MemRegion g1_reserved = g1h->g1_reserved(); |
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|
4531 double now = os::elapsedTime(); |
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|
4532 |
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|
4533 // Print the header of the output. |
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|
4534 _out->cr(); |
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changeset
|
4535 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4536 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4537 G1PPRL_SUM_ADDR_FORMAT("committed") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4538 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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|
4539 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
371bbc844bf1
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|
4540 g1_committed.start(), g1_committed.end(), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4541 g1_reserved.start(), g1_reserved.end(), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4542 HeapRegion::GrainBytes); |
2435
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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|
4543 _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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|
4544 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4545 G1PPRL_TYPE_H_FORMAT |
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|
4546 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4547 G1PPRL_BYTE_H_FORMAT |
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|
4548 G1PPRL_BYTE_H_FORMAT |
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|
4549 G1PPRL_BYTE_H_FORMAT |
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|
4550 G1PPRL_DOUBLE_H_FORMAT, |
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|
4551 "type", "address-range", |
371bbc844bf1
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|
4552 "used", "prev-live", "next-live", "gc-eff"); |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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3975
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changeset
|
4553 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4554 G1PPRL_TYPE_H_FORMAT |
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|
4555 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4556 G1PPRL_BYTE_H_FORMAT |
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|
4557 G1PPRL_BYTE_H_FORMAT |
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|
4558 G1PPRL_BYTE_H_FORMAT |
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|
4559 G1PPRL_DOUBLE_H_FORMAT, |
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3975
diff
changeset
|
4560 "", "", |
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3975
diff
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|
4561 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
2435
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|
4562 } |
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|
4563 |
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|
4564 // It takes as a parameter a reference to one of the _hum_* fields, it |
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|
4565 // deduces the corresponding value for a region in a humongous region |
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|
4566 // series (either the region size, or what's left if the _hum_* field |
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|
4567 // is < the region size), and updates the _hum_* field accordingly. |
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|
4568 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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|
4569 size_t bytes = 0; |
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|
4570 // The > 0 check is to deal with the prev and next live bytes which |
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|
4571 // could be 0. |
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|
4572 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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3979
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changeset
|
4573 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
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|
4574 *hum_bytes -= bytes; |
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|
4575 } |
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|
4576 return bytes; |
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|
4577 } |
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|
4578 |
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4579 // It deduces the values for a region in a humongous region series |
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4580 // from the _hum_* fields and updates those accordingly. It assumes |
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4581 // that that _hum_* fields have already been set up from the "starts |
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4582 // humongous" region and we visit the regions in address order. |
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4583 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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4584 size_t* capacity_bytes, |
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4585 size_t* prev_live_bytes, |
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4586 size_t* next_live_bytes) { |
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4587 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
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4588 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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4589 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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4590 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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4591 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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4592 } |
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|
4593 |
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4594 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
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4595 const char* type = ""; |
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4596 HeapWord* bottom = r->bottom(); |
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4597 HeapWord* end = r->end(); |
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4598 size_t capacity_bytes = r->capacity(); |
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4599 size_t used_bytes = r->used(); |
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4600 size_t prev_live_bytes = r->live_bytes(); |
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4601 size_t next_live_bytes = r->next_live_bytes(); |
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4602 double gc_eff = r->gc_efficiency(); |
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4603 if (r->used() == 0) { |
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4604 type = "FREE"; |
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4605 } else if (r->is_survivor()) { |
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4606 type = "SURV"; |
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4607 } else if (r->is_young()) { |
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4608 type = "EDEN"; |
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4609 } else if (r->startsHumongous()) { |
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4610 type = "HUMS"; |
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4611 |
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4612 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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4613 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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4614 "they should have been zeroed after the last time we used them"); |
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4615 // Set up the _hum_* fields. |
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4616 _hum_capacity_bytes = capacity_bytes; |
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4617 _hum_used_bytes = used_bytes; |
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4618 _hum_prev_live_bytes = prev_live_bytes; |
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4619 _hum_next_live_bytes = next_live_bytes; |
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4620 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4621 &prev_live_bytes, &next_live_bytes); |
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4622 end = bottom + HeapRegion::GrainWords; |
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4623 } else if (r->continuesHumongous()) { |
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|
4624 type = "HUMC"; |
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4625 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4626 &prev_live_bytes, &next_live_bytes); |
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4627 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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|
4628 } else { |
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|
4629 type = "OLD"; |
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|
4630 } |
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|
4631 |
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|
4632 _total_used_bytes += used_bytes; |
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4633 _total_capacity_bytes += capacity_bytes; |
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4634 _total_prev_live_bytes += prev_live_bytes; |
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4635 _total_next_live_bytes += next_live_bytes; |
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|
4636 |
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|
4637 // Print a line for this particular region. |
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|
4638 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4639 G1PPRL_TYPE_FORMAT |
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|
4640 G1PPRL_ADDR_BASE_FORMAT |
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|
4641 G1PPRL_BYTE_FORMAT |
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|
4642 G1PPRL_BYTE_FORMAT |
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|
4643 G1PPRL_BYTE_FORMAT |
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|
4644 G1PPRL_DOUBLE_FORMAT, |
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|
4645 type, bottom, end, |
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|
4646 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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|
4647 |
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|
4648 return false; |
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|
4649 } |
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|
4650 |
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|
4651 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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4652 // Print the footer of the output. |
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|
4653 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4654 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4655 " SUMMARY" |
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|
4656 G1PPRL_SUM_MB_FORMAT("capacity") |
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|
4657 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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|
4658 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
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4659 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
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|
4660 bytes_to_mb(_total_capacity_bytes), |
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|
4661 bytes_to_mb(_total_used_bytes), |
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|
4662 perc(_total_used_bytes, _total_capacity_bytes), |
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|
4663 bytes_to_mb(_total_prev_live_bytes), |
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|
4664 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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|
4665 bytes_to_mb(_total_next_live_bytes), |
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|
4666 perc(_total_next_live_bytes, _total_capacity_bytes)); |
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|
4667 _out->cr(); |
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|
4668 } |