Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 4096:00dd86e542eb
7114303: G1: assert(_g1->mark_in_progress()) failed: shouldn't be here otherwise
Summary: Race between the VM thread reading G1CollectedHeap::_mark_in_progress and it being set by the concurrent mark thread when concurrent marking is aborted by a full GC. Have the concurrent mark thread join the SuspendibleThreadSet before changing the marking state.
Reviewed-by: tonyp, brutisso
author | johnc |
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date | Mon, 28 Nov 2011 09:49:05 -0800 |
parents | bca17e38de00 |
children | dc467e8b2c5e |
rev | line source |
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342 | 1 /* |
2149 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
3771 | 32 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
34 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
35 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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36 #include "gc_implementation/shared/vmGCOperations.hpp" |
1972 | 37 #include "memory/genOopClosures.inline.hpp" |
38 #include "memory/referencePolicy.hpp" | |
39 #include "memory/resourceArea.hpp" | |
40 #include "oops/oop.inline.hpp" | |
41 #include "runtime/handles.inline.hpp" | |
42 #include "runtime/java.hpp" | |
342 | 43 |
44 // | |
45 // CMS Bit Map Wrapper | |
46 | |
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47 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
342 | 48 _bm((uintptr_t*)NULL,0), |
49 _shifter(shifter) { | |
50 _bmStartWord = (HeapWord*)(rs.base()); | |
51 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
52 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
53 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
54 | |
55 guarantee(brs.is_reserved(), "couldn't allocate CMS bit map"); | |
56 // For now we'll just commit all of the bit map up fromt. | |
57 // Later on we'll try to be more parsimonious with swap. | |
58 guarantee(_virtual_space.initialize(brs, brs.size()), | |
59 "couldn't reseve backing store for CMS bit map"); | |
60 assert(_virtual_space.committed_size() == brs.size(), | |
61 "didn't reserve backing store for all of CMS bit map?"); | |
62 _bm.set_map((uintptr_t*)_virtual_space.low()); | |
63 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
64 _bmWordSize, "inconsistency in bit map sizing"); | |
65 _bm.set_size(_bmWordSize >> _shifter); | |
66 } | |
67 | |
68 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
69 HeapWord* limit) const { | |
70 // First we must round addr *up* to a possible object boundary. | |
71 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
72 HeapWordSize << _shifter); | |
73 size_t addrOffset = heapWordToOffset(addr); | |
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74 if (limit == NULL) { |
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75 limit = _bmStartWord + _bmWordSize; |
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76 } |
342 | 77 size_t limitOffset = heapWordToOffset(limit); |
78 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
79 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
80 assert(nextAddr >= addr, "get_next_one postcondition"); | |
81 assert(nextAddr == limit || isMarked(nextAddr), | |
82 "get_next_one postcondition"); | |
83 return nextAddr; | |
84 } | |
85 | |
86 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
87 HeapWord* limit) const { | |
88 size_t addrOffset = heapWordToOffset(addr); | |
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89 if (limit == NULL) { |
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90 limit = _bmStartWord + _bmWordSize; |
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91 } |
342 | 92 size_t limitOffset = heapWordToOffset(limit); |
93 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
94 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
95 assert(nextAddr >= addr, "get_next_one postcondition"); | |
96 assert(nextAddr == limit || !isMarked(nextAddr), | |
97 "get_next_one postcondition"); | |
98 return nextAddr; | |
99 } | |
100 | |
101 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
102 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
103 return (int) (diff >> _shifter); | |
104 } | |
105 | |
106 bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) { | |
107 HeapWord* left = MAX2(_bmStartWord, mr.start()); | |
108 HeapWord* right = MIN2(_bmStartWord + _bmWordSize, mr.end()); | |
109 if (right > left) { | |
110 // Right-open interval [leftOffset, rightOffset). | |
111 return _bm.iterate(cl, heapWordToOffset(left), heapWordToOffset(right)); | |
112 } else { | |
113 return true; | |
114 } | |
115 } | |
116 | |
117 void CMBitMapRO::mostly_disjoint_range_union(BitMap* from_bitmap, | |
118 size_t from_start_index, | |
119 HeapWord* to_start_word, | |
120 size_t word_num) { | |
121 _bm.mostly_disjoint_range_union(from_bitmap, | |
122 from_start_index, | |
123 heapWordToOffset(to_start_word), | |
124 word_num); | |
125 } | |
126 | |
127 #ifndef PRODUCT | |
128 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
129 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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130 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
342 | 131 "size inconsistency"); |
132 return _bmStartWord == (HeapWord*)(rs.base()) && | |
133 _bmWordSize == rs.size()>>LogHeapWordSize; | |
134 } | |
135 #endif | |
136 | |
137 void CMBitMap::clearAll() { | |
138 _bm.clear(); | |
139 return; | |
140 } | |
141 | |
142 void CMBitMap::markRange(MemRegion mr) { | |
143 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
144 assert(!mr.is_empty(), "unexpected empty region"); | |
145 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
146 ((HeapWord *) mr.end())), | |
147 "markRange memory region end is not card aligned"); | |
148 // convert address range into offset range | |
149 _bm.at_put_range(heapWordToOffset(mr.start()), | |
150 heapWordToOffset(mr.end()), true); | |
151 } | |
152 | |
153 void CMBitMap::clearRange(MemRegion mr) { | |
154 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
155 assert(!mr.is_empty(), "unexpected empty region"); | |
156 // convert address range into offset range | |
157 _bm.at_put_range(heapWordToOffset(mr.start()), | |
158 heapWordToOffset(mr.end()), false); | |
159 } | |
160 | |
161 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
162 HeapWord* end_addr) { | |
163 HeapWord* start = getNextMarkedWordAddress(addr); | |
164 start = MIN2(start, end_addr); | |
165 HeapWord* end = getNextUnmarkedWordAddress(start); | |
166 end = MIN2(end, end_addr); | |
167 assert(start <= end, "Consistency check"); | |
168 MemRegion mr(start, end); | |
169 if (!mr.is_empty()) { | |
170 clearRange(mr); | |
171 } | |
172 return mr; | |
173 } | |
174 | |
175 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
176 _base(NULL), _cm(cm) | |
177 #ifdef ASSERT | |
178 , _drain_in_progress(false) | |
179 , _drain_in_progress_yields(false) | |
180 #endif | |
181 {} | |
182 | |
183 void CMMarkStack::allocate(size_t size) { | |
184 _base = NEW_C_HEAP_ARRAY(oop, size); | |
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185 if (_base == NULL) { |
342 | 186 vm_exit_during_initialization("Failed to allocate " |
187 "CM region mark stack"); | |
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188 } |
342 | 189 _index = 0; |
190 _capacity = (jint) size; | |
191 _oops_do_bound = -1; | |
192 NOT_PRODUCT(_max_depth = 0); | |
193 } | |
194 | |
195 CMMarkStack::~CMMarkStack() { | |
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196 if (_base != NULL) { |
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197 FREE_C_HEAP_ARRAY(oop, _base); |
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198 } |
342 | 199 } |
200 | |
201 void CMMarkStack::par_push(oop ptr) { | |
202 while (true) { | |
203 if (isFull()) { | |
204 _overflow = true; | |
205 return; | |
206 } | |
207 // Otherwise... | |
208 jint index = _index; | |
209 jint next_index = index+1; | |
210 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
211 if (res == index) { | |
212 _base[index] = ptr; | |
213 // Note that we don't maintain this atomically. We could, but it | |
214 // doesn't seem necessary. | |
215 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
216 return; | |
217 } | |
218 // Otherwise, we need to try again. | |
219 } | |
220 } | |
221 | |
222 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
223 while (true) { | |
224 if (isFull()) { | |
225 _overflow = true; | |
226 return; | |
227 } | |
228 // Otherwise... | |
229 jint index = _index; | |
230 jint next_index = index + n; | |
231 if (next_index > _capacity) { | |
232 _overflow = true; | |
233 return; | |
234 } | |
235 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
236 if (res == index) { | |
237 for (int i = 0; i < n; i++) { | |
238 int ind = index + i; | |
239 assert(ind < _capacity, "By overflow test above."); | |
240 _base[ind] = ptr_arr[i]; | |
241 } | |
242 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
243 return; | |
244 } | |
245 // Otherwise, we need to try again. | |
246 } | |
247 } | |
248 | |
249 | |
250 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
251 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
252 jint start = _index; | |
253 jint next_index = start + n; | |
254 if (next_index > _capacity) { | |
255 _overflow = true; | |
256 return; | |
257 } | |
258 // Otherwise. | |
259 _index = next_index; | |
260 for (int i = 0; i < n; i++) { | |
261 int ind = start + i; | |
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262 assert(ind < _capacity, "By overflow test above."); |
342 | 263 _base[ind] = ptr_arr[i]; |
264 } | |
265 } | |
266 | |
267 | |
268 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
269 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
270 jint index = _index; | |
271 if (index == 0) { | |
272 *n = 0; | |
273 return false; | |
274 } else { | |
275 int k = MIN2(max, index); | |
276 jint new_ind = index - k; | |
277 for (int j = 0; j < k; j++) { | |
278 ptr_arr[j] = _base[new_ind + j]; | |
279 } | |
280 _index = new_ind; | |
281 *n = k; | |
282 return true; | |
283 } | |
284 } | |
285 | |
286 | |
287 CMRegionStack::CMRegionStack() : _base(NULL) {} | |
288 | |
289 void CMRegionStack::allocate(size_t size) { | |
290 _base = NEW_C_HEAP_ARRAY(MemRegion, size); | |
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291 if (_base == NULL) { |
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292 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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293 } |
342 | 294 _index = 0; |
295 _capacity = (jint) size; | |
296 } | |
297 | |
298 CMRegionStack::~CMRegionStack() { | |
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299 if (_base != NULL) { |
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300 FREE_C_HEAP_ARRAY(oop, _base); |
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301 } |
342 | 302 } |
303 | |
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304 void CMRegionStack::push_lock_free(MemRegion mr) { |
342 | 305 assert(mr.word_size() > 0, "Precondition"); |
306 while (true) { | |
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307 jint index = _index; |
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308 |
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309 if (index >= _capacity) { |
342 | 310 _overflow = true; |
311 return; | |
312 } | |
313 // Otherwise... | |
314 jint next_index = index+1; | |
315 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
316 if (res == index) { | |
317 _base[index] = mr; | |
318 return; | |
319 } | |
320 // Otherwise, we need to try again. | |
321 } | |
322 } | |
323 | |
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324 // Lock-free pop of the region stack. Called during the concurrent |
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325 // marking / remark phases. Should only be called in tandem with |
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326 // other lock-free pops. |
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327 MemRegion CMRegionStack::pop_lock_free() { |
342 | 328 while (true) { |
329 jint index = _index; | |
330 | |
331 if (index == 0) { | |
332 return MemRegion(); | |
333 } | |
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334 // Otherwise... |
342 | 335 jint next_index = index-1; |
336 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
337 if (res == index) { | |
338 MemRegion mr = _base[next_index]; | |
339 if (mr.start() != NULL) { | |
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340 assert(mr.end() != NULL, "invariant"); |
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341 assert(mr.word_size() > 0, "invariant"); |
342 | 342 return mr; |
343 } else { | |
344 // that entry was invalidated... let's skip it | |
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345 assert(mr.end() == NULL, "invariant"); |
342 | 346 } |
347 } | |
348 // Otherwise, we need to try again. | |
349 } | |
350 } | |
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351 |
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352 #if 0 |
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353 // The routines that manipulate the region stack with a lock are |
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354 // not currently used. They should be retained, however, as a |
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355 // diagnostic aid. |
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356 |
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357 void CMRegionStack::push_with_lock(MemRegion mr) { |
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358 assert(mr.word_size() > 0, "Precondition"); |
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359 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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360 |
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361 if (isFull()) { |
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362 _overflow = true; |
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363 return; |
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364 } |
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365 |
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366 _base[_index] = mr; |
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367 _index += 1; |
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368 } |
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369 |
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370 MemRegion CMRegionStack::pop_with_lock() { |
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371 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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372 |
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373 while (true) { |
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374 if (_index == 0) { |
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375 return MemRegion(); |
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376 } |
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377 _index -= 1; |
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378 |
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379 MemRegion mr = _base[_index]; |
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380 if (mr.start() != NULL) { |
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381 assert(mr.end() != NULL, "invariant"); |
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382 assert(mr.word_size() > 0, "invariant"); |
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383 return mr; |
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384 } else { |
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385 // that entry was invalidated... let's skip it |
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386 assert(mr.end() == NULL, "invariant"); |
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387 } |
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388 } |
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389 } |
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390 #endif |
342 | 391 |
392 bool CMRegionStack::invalidate_entries_into_cset() { | |
393 bool result = false; | |
394 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
395 for (int i = 0; i < _oops_do_bound; ++i) { | |
396 MemRegion mr = _base[i]; | |
397 if (mr.start() != NULL) { | |
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398 assert(mr.end() != NULL, "invariant"); |
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399 assert(mr.word_size() > 0, "invariant"); |
342 | 400 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
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401 assert(hr != NULL, "invariant"); |
342 | 402 if (hr->in_collection_set()) { |
403 // The region points into the collection set | |
404 _base[i] = MemRegion(); | |
405 result = true; | |
406 } | |
407 } else { | |
408 // that entry was invalidated... let's skip it | |
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409 assert(mr.end() == NULL, "invariant"); |
342 | 410 } |
411 } | |
412 return result; | |
413 } | |
414 | |
415 template<class OopClosureClass> | |
416 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
417 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
418 || SafepointSynchronize::is_at_safepoint(), | |
419 "Drain recursion must be yield-safe."); | |
420 bool res = true; | |
421 debug_only(_drain_in_progress = true); | |
422 debug_only(_drain_in_progress_yields = yield_after); | |
423 while (!isEmpty()) { | |
424 oop newOop = pop(); | |
425 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
426 assert(newOop->is_oop(), "Expected an oop"); | |
427 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
428 "only grey objects on this stack"); | |
429 // iterate over the oops in this oop, marking and pushing | |
430 // the ones in CMS generation. | |
431 newOop->oop_iterate(cl); | |
432 if (yield_after && _cm->do_yield_check()) { | |
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433 res = false; |
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434 break; |
342 | 435 } |
436 } | |
437 debug_only(_drain_in_progress = false); | |
438 return res; | |
439 } | |
440 | |
441 void CMMarkStack::oops_do(OopClosure* f) { | |
442 if (_index == 0) return; | |
443 assert(_oops_do_bound != -1 && _oops_do_bound <= _index, | |
444 "Bound must be set."); | |
445 for (int i = 0; i < _oops_do_bound; i++) { | |
446 f->do_oop(&_base[i]); | |
447 } | |
448 _oops_do_bound = -1; | |
449 } | |
450 | |
451 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
452 return (_g1h->is_obj_ill(obj) | |
453 || (_g1h->is_in_permanent(obj) | |
454 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
455 } | |
456 | |
457 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
458 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
459 #endif // _MSC_VER | |
460 | |
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461 size_t ConcurrentMark::scale_parallel_threads(size_t n_par_threads) { |
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462 return MAX2((n_par_threads + 2) / 4, (size_t)1); |
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463 } |
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464 |
342 | 465 ConcurrentMark::ConcurrentMark(ReservedSpace rs, |
466 int max_regions) : | |
467 _markBitMap1(rs, MinObjAlignment - 1), | |
468 _markBitMap2(rs, MinObjAlignment - 1), | |
469 | |
470 _parallel_marking_threads(0), | |
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471 _max_parallel_marking_threads(0), |
342 | 472 _sleep_factor(0.0), |
473 _marking_task_overhead(1.0), | |
474 _cleanup_sleep_factor(0.0), | |
475 _cleanup_task_overhead(1.0), | |
2152 | 476 _cleanup_list("Cleanup List"), |
342 | 477 _region_bm(max_regions, false /* in_resource_area*/), |
478 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
479 CardTableModRefBS::card_shift, | |
480 false /* in_resource_area*/), | |
481 _prevMarkBitMap(&_markBitMap1), | |
482 _nextMarkBitMap(&_markBitMap2), | |
483 _at_least_one_mark_complete(false), | |
484 | |
485 _markStack(this), | |
486 _regionStack(), | |
487 // _finger set in set_non_marking_state | |
488 | |
489 _max_task_num(MAX2(ParallelGCThreads, (size_t)1)), | |
490 // _active_tasks set in set_non_marking_state | |
491 // _tasks set inside the constructor | |
492 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
493 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
494 | |
495 _has_overflown(false), | |
496 _concurrent(false), | |
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497 _has_aborted(false), |
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498 _restart_for_overflow(false), |
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499 _concurrent_marking_in_progress(false), |
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500 _should_gray_objects(false), |
342 | 501 |
502 // _verbose_level set below | |
503 | |
504 _init_times(), | |
505 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
506 _cleanup_times(), | |
507 _total_counting_time(0.0), | |
508 _total_rs_scrub_time(0.0), | |
509 | |
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510 _parallel_workers(NULL) { |
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511 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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512 if (verbose_level < no_verbose) { |
342 | 513 verbose_level = no_verbose; |
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514 } |
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515 if (verbose_level > high_verbose) { |
342 | 516 verbose_level = high_verbose; |
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517 } |
342 | 518 _verbose_level = verbose_level; |
519 | |
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520 if (verbose_low()) { |
342 | 521 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
522 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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523 } |
342 | 524 |
1284 | 525 _markStack.allocate(MarkStackSize); |
751 | 526 _regionStack.allocate(G1MarkRegionStackSize); |
342 | 527 |
528 // Create & start a ConcurrentMark thread. | |
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529 _cmThread = new ConcurrentMarkThread(this); |
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530 assert(cmThread() != NULL, "CM Thread should have been created"); |
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531 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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532 |
342 | 533 _g1h = G1CollectedHeap::heap(); |
534 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
535 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
536 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
537 | |
538 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 539 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 540 |
541 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
542 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
543 | |
544 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail | |
545 _active_tasks = _max_task_num; | |
546 for (int i = 0; i < (int) _max_task_num; ++i) { | |
547 CMTaskQueue* task_queue = new CMTaskQueue(); | |
548 task_queue->initialize(); | |
549 _task_queues->register_queue(i, task_queue); | |
550 | |
551 _tasks[i] = new CMTask(i, this, task_queue, _task_queues); | |
552 _accum_task_vtime[i] = 0.0; | |
553 } | |
554 | |
1284 | 555 if (ConcGCThreads > ParallelGCThreads) { |
556 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
342 | 557 "than ParallelGCThreads."); |
558 } | |
559 if (ParallelGCThreads == 0) { | |
560 // if we are not running with any parallel GC threads we will not | |
561 // spawn any marking threads either | |
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562 _parallel_marking_threads = 0; |
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563 _max_parallel_marking_threads = 0; |
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564 _sleep_factor = 0.0; |
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565 _marking_task_overhead = 1.0; |
342 | 566 } else { |
1284 | 567 if (ConcGCThreads > 0) { |
568 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
342 | 569 // if both are set |
570 | |
1284 | 571 _parallel_marking_threads = ConcGCThreads; |
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572 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 573 _sleep_factor = 0.0; |
574 _marking_task_overhead = 1.0; | |
751 | 575 } else if (G1MarkingOverheadPercent > 0) { |
342 | 576 // we will calculate the number of parallel marking threads |
577 // based on a target overhead with respect to the soft real-time | |
578 // goal | |
579 | |
751 | 580 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 581 double overall_cm_overhead = |
751 | 582 (double) MaxGCPauseMillis * marking_overhead / |
583 (double) GCPauseIntervalMillis; | |
342 | 584 double cpu_ratio = 1.0 / (double) os::processor_count(); |
585 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
586 double marking_task_overhead = | |
587 overall_cm_overhead / marking_thread_num * | |
588 (double) os::processor_count(); | |
589 double sleep_factor = | |
590 (1.0 - marking_task_overhead) / marking_task_overhead; | |
591 | |
592 _parallel_marking_threads = (size_t) marking_thread_num; | |
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593 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 594 _sleep_factor = sleep_factor; |
595 _marking_task_overhead = marking_task_overhead; | |
596 } else { | |
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597 _parallel_marking_threads = scale_parallel_threads(ParallelGCThreads); |
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598 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 599 _sleep_factor = 0.0; |
600 _marking_task_overhead = 1.0; | |
601 } | |
602 | |
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603 if (parallel_marking_threads() > 1) { |
342 | 604 _cleanup_task_overhead = 1.0; |
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605 } else { |
342 | 606 _cleanup_task_overhead = marking_task_overhead(); |
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607 } |
342 | 608 _cleanup_sleep_factor = |
609 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
610 | |
611 #if 0 | |
612 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
613 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
614 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
615 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
616 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
617 #endif | |
618 | |
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619 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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620 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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621 (int) _max_parallel_marking_threads, false, true); |
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622 if (_parallel_workers == NULL) { |
342 | 623 vm_exit_during_initialization("Failed necessary allocation."); |
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624 } else { |
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625 _parallel_workers->initialize_workers(); |
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626 } |
342 | 627 } |
628 | |
629 // so that the call below can read a sensible value | |
630 _heap_start = (HeapWord*) rs.base(); | |
631 set_non_marking_state(); | |
632 } | |
633 | |
634 void ConcurrentMark::update_g1_committed(bool force) { | |
635 // If concurrent marking is not in progress, then we do not need to | |
636 // update _heap_end. This has a subtle and important | |
637 // side-effect. Imagine that two evacuation pauses happen between | |
638 // marking completion and remark. The first one can grow the | |
639 // heap (hence now the finger is below the heap end). Then, the | |
640 // second one could unnecessarily push regions on the region | |
641 // stack. This causes the invariant that the region stack is empty | |
642 // at the beginning of remark to be false. By ensuring that we do | |
643 // not observe heap expansions after marking is complete, then we do | |
644 // not have this problem. | |
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645 if (!concurrent_marking_in_progress() && !force) return; |
342 | 646 |
647 MemRegion committed = _g1h->g1_committed(); | |
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648 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 649 HeapWord* new_end = committed.end(); |
650 if (new_end > _heap_end) { | |
651 // The heap has been expanded. | |
652 | |
653 _heap_end = new_end; | |
654 } | |
655 // Notice that the heap can also shrink. However, this only happens | |
656 // during a Full GC (at least currently) and the entire marking | |
657 // phase will bail out and the task will not be restarted. So, let's | |
658 // do nothing. | |
659 } | |
660 | |
661 void ConcurrentMark::reset() { | |
662 // Starting values for these two. This should be called in a STW | |
663 // phase. CM will be notified of any future g1_committed expansions | |
664 // will be at the end of evacuation pauses, when tasks are | |
665 // inactive. | |
666 MemRegion committed = _g1h->g1_committed(); | |
667 _heap_start = committed.start(); | |
668 _heap_end = committed.end(); | |
669 | |
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670 // Separated the asserts so that we know which one fires. |
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671 assert(_heap_start != NULL, "heap bounds should look ok"); |
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672 assert(_heap_end != NULL, "heap bounds should look ok"); |
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673 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 674 |
675 // reset all the marking data structures and any necessary flags | |
676 clear_marking_state(); | |
677 | |
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678 if (verbose_low()) { |
342 | 679 gclog_or_tty->print_cr("[global] resetting"); |
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680 } |
342 | 681 |
682 // We do reset all of them, since different phases will use | |
683 // different number of active threads. So, it's easiest to have all | |
684 // of them ready. | |
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685 for (int i = 0; i < (int) _max_task_num; ++i) { |
342 | 686 _tasks[i]->reset(_nextMarkBitMap); |
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687 } |
342 | 688 |
689 // we need this to make sure that the flag is on during the evac | |
690 // pause with initial mark piggy-backed | |
691 set_concurrent_marking_in_progress(); | |
692 } | |
693 | |
694 void ConcurrentMark::set_phase(size_t active_tasks, bool concurrent) { | |
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695 assert(active_tasks <= _max_task_num, "we should not have more"); |
342 | 696 |
697 _active_tasks = active_tasks; | |
698 // Need to update the three data structures below according to the | |
699 // number of active threads for this phase. | |
700 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
701 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
702 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
703 | |
704 _concurrent = concurrent; | |
705 // We propagate this to all tasks, not just the active ones. | |
706 for (int i = 0; i < (int) _max_task_num; ++i) | |
707 _tasks[i]->set_concurrent(concurrent); | |
708 | |
709 if (concurrent) { | |
710 set_concurrent_marking_in_progress(); | |
711 } else { | |
712 // We currently assume that the concurrent flag has been set to | |
713 // false before we start remark. At this point we should also be | |
714 // in a STW phase. | |
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715 assert(!concurrent_marking_in_progress(), "invariant"); |
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716 assert(_finger == _heap_end, "only way to get here"); |
342 | 717 update_g1_committed(true); |
718 } | |
719 } | |
720 | |
721 void ConcurrentMark::set_non_marking_state() { | |
722 // We set the global marking state to some default values when we're | |
723 // not doing marking. | |
724 clear_marking_state(); | |
725 _active_tasks = 0; | |
726 clear_concurrent_marking_in_progress(); | |
727 } | |
728 | |
729 ConcurrentMark::~ConcurrentMark() { | |
730 for (int i = 0; i < (int) _max_task_num; ++i) { | |
731 delete _task_queues->queue(i); | |
732 delete _tasks[i]; | |
733 } | |
734 delete _task_queues; | |
735 FREE_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
736 } | |
737 | |
738 // This closure is used to mark refs into the g1 generation | |
739 // from external roots in the CMS bit map. | |
740 // Called at the first checkpoint. | |
741 // | |
742 | |
743 void ConcurrentMark::clearNextBitmap() { | |
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744 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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745 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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746 |
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747 // Make sure that the concurrent mark thread looks to still be in |
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748 // the current cycle. |
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749 guarantee(cmThread()->during_cycle(), "invariant"); |
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750 |
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751 // We are finishing up the current cycle by clearing the next |
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752 // marking bitmap and getting it ready for the next cycle. During |
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753 // this time no other cycle can start. So, let's make sure that this |
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754 // is the case. |
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755 guarantee(!g1h->mark_in_progress(), "invariant"); |
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756 |
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757 // clear the mark bitmap (no grey objects to start with). |
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758 // We need to do this in chunks and offer to yield in between |
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759 // each chunk. |
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760 HeapWord* start = _nextMarkBitMap->startWord(); |
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761 HeapWord* end = _nextMarkBitMap->endWord(); |
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762 HeapWord* cur = start; |
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763 size_t chunkSize = M; |
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764 while (cur < end) { |
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765 HeapWord* next = cur + chunkSize; |
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766 if (next > end) { |
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767 next = end; |
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768 } |
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769 MemRegion mr(cur,next); |
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770 _nextMarkBitMap->clearRange(mr); |
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771 cur = next; |
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772 do_yield_check(); |
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773 |
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774 // Repeat the asserts from above. We'll do them as asserts here to |
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775 // minimize their overhead on the product. However, we'll have |
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776 // them as guarantees at the beginning / end of the bitmap |
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777 // clearing to get some checking in the product. |
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778 assert(cmThread()->during_cycle(), "invariant"); |
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779 assert(!g1h->mark_in_progress(), "invariant"); |
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780 } |
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781 |
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782 // Repeat the asserts from above. |
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783 guarantee(cmThread()->during_cycle(), "invariant"); |
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784 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 785 } |
786 | |
787 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
788 public: | |
789 bool doHeapRegion(HeapRegion* r) { | |
790 if (!r->continuesHumongous()) { | |
791 r->note_start_of_marking(true); | |
792 } | |
793 return false; | |
794 } | |
795 }; | |
796 | |
797 void ConcurrentMark::checkpointRootsInitialPre() { | |
798 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
799 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
800 | |
801 _has_aborted = false; | |
802 | |
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803 #ifndef PRODUCT |
1044 | 804 if (G1PrintReachableAtInitialMark) { |
1388 | 805 print_reachable("at-cycle-start", |
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806 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 807 } |
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808 #endif |
342 | 809 |
810 // Initialise marking structures. This has to be done in a STW phase. | |
811 reset(); | |
812 } | |
813 | |
814 | |
815 void ConcurrentMark::checkpointRootsInitialPost() { | |
816 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
817 | |
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818 // If we force an overflow during remark, the remark operation will |
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819 // actually abort and we'll restart concurrent marking. If we always |
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820 // force an oveflow during remark we'll never actually complete the |
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821 // marking phase. So, we initilize this here, at the start of the |
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822 // cycle, so that at the remaining overflow number will decrease at |
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823 // every remark and we'll eventually not need to cause one. |
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824 force_overflow_stw()->init(); |
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825 |
342 | 826 // For each region note start of marking. |
827 NoteStartOfMarkHRClosure startcl; | |
828 g1h->heap_region_iterate(&startcl); | |
829 | |
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830 // Start Concurrent Marking weak-reference discovery. |
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831 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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832 // enable ("weak") refs discovery |
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833 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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834 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 835 |
836 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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837 // This is the start of the marking cycle, we're expected all |
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838 // threads to have SATB queues with active set to false. |
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839 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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840 false /* expected_active */); |
342 | 841 |
842 // update_g1_committed() will be called at the end of an evac pause | |
843 // when marking is on. So, it's also called at the end of the | |
844 // initial-mark pause to update the heap end, if the heap expands | |
845 // during it. No need to call it here. | |
846 } | |
847 | |
848 /* | |
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849 * Notice that in the next two methods, we actually leave the STS |
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850 * during the barrier sync and join it immediately afterwards. If we |
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851 * do not do this, the following deadlock can occur: one thread could |
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852 * be in the barrier sync code, waiting for the other thread to also |
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853 * sync up, whereas another one could be trying to yield, while also |
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854 * waiting for the other threads to sync up too. |
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855 * |
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856 * Note, however, that this code is also used during remark and in |
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857 * this case we should not attempt to leave / enter the STS, otherwise |
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858 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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859 * (product). So we should only leave / enter the STS if we are |
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860 * operating concurrently. |
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861 * |
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862 * Because the thread that does the sync barrier has left the STS, it |
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863 * is possible to be suspended for a Full GC or an evacuation pause |
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864 * could occur. This is actually safe, since the entering the sync |
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865 * barrier is one of the last things do_marking_step() does, and it |
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866 * doesn't manipulate any data structures afterwards. |
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867 */ |
342 | 868 |
869 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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870 if (verbose_low()) { |
342 | 871 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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872 } |
342 | 873 |
3316
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874 if (concurrent()) { |
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875 ConcurrentGCThread::stsLeave(); |
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876 } |
342 | 877 _first_overflow_barrier_sync.enter(); |
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878 if (concurrent()) { |
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879 ConcurrentGCThread::stsJoin(); |
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880 } |
342 | 881 // at this point everyone should have synced up and not be doing any |
882 // more work | |
883 | |
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884 if (verbose_low()) { |
342 | 885 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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886 } |
342 | 887 |
888 // let task 0 do this | |
889 if (task_num == 0) { | |
890 // task 0 is responsible for clearing the global data structures | |
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891 // We should be here because of an overflow. During STW we should |
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892 // not clear the overflow flag since we rely on it being true when |
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893 // we exit this method to abort the pause and restart concurent |
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894 // marking. |
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895 clear_marking_state(concurrent() /* clear_overflow */); |
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896 force_overflow()->update(); |
342 | 897 |
898 if (PrintGC) { | |
899 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
900 gclog_or_tty->stamp(PrintGCTimeStamps); | |
901 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
902 } | |
903 } | |
904 | |
905 // after this, each task should reset its own data structures then | |
906 // then go into the second barrier | |
907 } | |
908 | |
909 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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910 if (verbose_low()) { |
342 | 911 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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912 } |
342 | 913 |
3316
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914 if (concurrent()) { |
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915 ConcurrentGCThread::stsLeave(); |
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916 } |
342 | 917 _second_overflow_barrier_sync.enter(); |
3316
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918 if (concurrent()) { |
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919 ConcurrentGCThread::stsJoin(); |
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920 } |
342 | 921 // at this point everything should be re-initialised and ready to go |
922 | |
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923 if (verbose_low()) { |
342 | 924 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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925 } |
342 | 926 } |
927 | |
3316
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928 #ifndef PRODUCT |
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929 void ForceOverflowSettings::init() { |
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930 _num_remaining = G1ConcMarkForceOverflow; |
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931 _force = false; |
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932 update(); |
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933 } |
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934 |
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935 void ForceOverflowSettings::update() { |
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936 if (_num_remaining > 0) { |
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937 _num_remaining -= 1; |
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938 _force = true; |
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939 } else { |
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940 _force = false; |
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941 } |
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942 } |
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943 |
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944 bool ForceOverflowSettings::should_force() { |
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945 if (_force) { |
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946 _force = false; |
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947 return true; |
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948 } else { |
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949 return false; |
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950 } |
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951 } |
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952 #endif // !PRODUCT |
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953 |
342 | 954 void ConcurrentMark::grayRoot(oop p) { |
955 HeapWord* addr = (HeapWord*) p; | |
956 // We can't really check against _heap_start and _heap_end, since it | |
957 // is possible during an evacuation pause with piggy-backed | |
958 // initial-mark that the committed space is expanded during the | |
959 // pause without CM observing this change. So the assertions below | |
960 // is a bit conservative; but better than nothing. | |
1023
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961 assert(_g1h->g1_committed().contains(addr), |
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962 "address should be within the heap bounds"); |
342 | 963 |
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964 if (!_nextMarkBitMap->isMarked(addr)) { |
342 | 965 _nextMarkBitMap->parMark(addr); |
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966 } |
342 | 967 } |
968 | |
969 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { | |
970 // The objects on the region have already been marked "in bulk" by | |
971 // the caller. We only need to decide whether to push the region on | |
972 // the region stack or not. | |
973 | |
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974 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
342 | 975 // We're done with marking and waiting for remark. We do not need to |
976 // push anything else on the region stack. | |
977 return; | |
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978 } |
342 | 979 |
980 HeapWord* finger = _finger; | |
981 | |
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982 if (verbose_low()) { |
342 | 983 gclog_or_tty->print_cr("[global] attempting to push " |
984 "region ["PTR_FORMAT", "PTR_FORMAT"), finger is at " | |
985 PTR_FORMAT, mr.start(), mr.end(), finger); | |
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986 } |
342 | 987 |
988 if (mr.start() < finger) { | |
989 // The finger is always heap region aligned and it is not possible | |
990 // for mr to span heap regions. | |
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991 assert(mr.end() <= finger, "invariant"); |
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992 |
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993 // Separated the asserts so that we know which one fires. |
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994 assert(mr.start() <= mr.end(), |
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995 "region boundaries should fall within the committed space"); |
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996 assert(_heap_start <= mr.start(), |
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997 "region boundaries should fall within the committed space"); |
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998 assert(mr.end() <= _heap_end, |
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999 "region boundaries should fall within the committed space"); |
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1000 if (verbose_low()) { |
342 | 1001 gclog_or_tty->print_cr("[global] region ["PTR_FORMAT", "PTR_FORMAT") " |
1002 "below the finger, pushing it", | |
1003 mr.start(), mr.end()); | |
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1004 } |
342 | 1005 |
1835
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1006 if (!region_stack_push_lock_free(mr)) { |
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1007 if (verbose_low()) { |
342 | 1008 gclog_or_tty->print_cr("[global] region stack has overflown."); |
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1009 } |
342 | 1010 } |
1011 } | |
1012 } | |
1013 | |
1014 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
1015 // The object is not marked by the caller. We need to at least mark | |
1016 // it and maybe push in on the stack. | |
1017 | |
1018 HeapWord* addr = (HeapWord*)p; | |
1019 if (!_nextMarkBitMap->isMarked(addr)) { | |
1020 // We definitely need to mark it, irrespective whether we bail out | |
1021 // because we're done with marking. | |
1022 if (_nextMarkBitMap->parMark(addr)) { | |
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1023 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
342 | 1024 // If we're done with concurrent marking and we're waiting for |
1025 // remark, then we're not pushing anything on the stack. | |
1026 return; | |
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1027 } |
342 | 1028 |
1029 // No OrderAccess:store_load() is needed. It is implicit in the | |
1030 // CAS done in parMark(addr) above | |
1031 HeapWord* finger = _finger; | |
1032 | |
1033 if (addr < finger) { | |
1034 if (!mark_stack_push(oop(addr))) { | |
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1035 if (verbose_low()) { |
342 | 1036 gclog_or_tty->print_cr("[global] global stack overflow " |
1037 "during parMark"); | |
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1038 } |
342 | 1039 } |
1040 } | |
1041 } | |
1042 } | |
1043 } | |
1044 | |
1045 class CMConcurrentMarkingTask: public AbstractGangTask { | |
1046 private: | |
1047 ConcurrentMark* _cm; | |
1048 ConcurrentMarkThread* _cmt; | |
1049 | |
1050 public: | |
1051 void work(int worker_i) { | |
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1052 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1053 "this should only be done by a conc GC thread"); |
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1054 ResourceMark rm; |
342 | 1055 |
1056 double start_vtime = os::elapsedVTime(); | |
1057 | |
1058 ConcurrentGCThread::stsJoin(); | |
1059 | |
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1060 assert((size_t) worker_i < _cm->active_tasks(), "invariant"); |
342 | 1061 CMTask* the_task = _cm->task(worker_i); |
1062 the_task->record_start_time(); | |
1063 if (!_cm->has_aborted()) { | |
1064 do { | |
1065 double start_vtime_sec = os::elapsedVTime(); | |
1066 double start_time_sec = os::elapsedTime(); | |
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1067 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1068 |
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1069 the_task->do_marking_step(mark_step_duration_ms, |
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1070 true /* do_stealing */, |
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1071 true /* do_termination */); |
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1072 |
342 | 1073 double end_time_sec = os::elapsedTime(); |
1074 double end_vtime_sec = os::elapsedVTime(); | |
1075 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1076 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1077 _cm->clear_has_overflown(); | |
1078 | |
1079 bool ret = _cm->do_yield_check(worker_i); | |
1080 | |
1081 jlong sleep_time_ms; | |
1082 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1083 sleep_time_ms = | |
1084 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1085 ConcurrentGCThread::stsLeave(); | |
1086 os::sleep(Thread::current(), sleep_time_ms, false); | |
1087 ConcurrentGCThread::stsJoin(); | |
1088 } | |
1089 double end_time2_sec = os::elapsedTime(); | |
1090 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1091 | |
1092 #if 0 | |
1093 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1094 "overhead %1.4lf", | |
1095 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1096 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1097 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1098 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1099 #endif | |
1100 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1101 } | |
1102 the_task->record_end_time(); | |
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1103 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1104 |
1105 ConcurrentGCThread::stsLeave(); | |
1106 | |
1107 double end_vtime = os::elapsedVTime(); | |
1108 _cm->update_accum_task_vtime(worker_i, end_vtime - start_vtime); | |
1109 } | |
1110 | |
1111 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1112 ConcurrentMarkThread* cmt) : | |
1113 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1114 | |
1115 ~CMConcurrentMarkingTask() { } | |
1116 }; | |
1117 | |
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1118 // Calculates the number of active workers for a concurrent |
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1119 // phase. |
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1120 int ConcurrentMark::calc_parallel_marking_threads() { |
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1121 |
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1122 size_t n_conc_workers; |
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1123 if (!G1CollectedHeap::use_parallel_gc_threads()) { |
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1124 n_conc_workers = 1; |
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1125 } else { |
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1126 if (!UseDynamicNumberOfGCThreads || |
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1127 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1128 !ForceDynamicNumberOfGCThreads)) { |
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1129 n_conc_workers = max_parallel_marking_threads(); |
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1130 } else { |
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1131 n_conc_workers = |
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1132 AdaptiveSizePolicy::calc_default_active_workers( |
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1133 max_parallel_marking_threads(), |
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1134 1, /* Minimum workers */ |
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1135 parallel_marking_threads(), |
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1136 Threads::number_of_non_daemon_threads()); |
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1137 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1138 // that scaling has already gone into "_max_parallel_marking_threads". |
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1139 } |
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1140 } |
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1141 assert(n_conc_workers > 0, "Always need at least 1"); |
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1142 return (int) MAX2(n_conc_workers, (size_t) 1); |
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1143 } |
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1144 |
342 | 1145 void ConcurrentMark::markFromRoots() { |
1146 // we might be tempted to assert that: | |
1147 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1148 // "inconsistent argument?"); | |
1149 // However that wouldn't be right, because it's possible that | |
1150 // a safepoint is indeed in progress as a younger generation | |
1151 // stop-the-world GC happens even as we mark in this generation. | |
1152 | |
1153 _restart_for_overflow = false; | |
1154 | |
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1155 // Parallel task terminator is set in "set_phase()". |
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1156 force_overflow_conc()->init(); |
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1157 |
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1158 // _g1h has _n_par_threads |
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1159 |
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1160 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1161 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1162 "Maximum number of marking threads exceeded"); |
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1163 _parallel_workers->set_active_workers((int)_parallel_marking_threads); |
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1164 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() |
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1165 // and the decisions on that MT processing is made elsewhere. |
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1166 |
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1167 assert( _parallel_workers->active_workers() > 0, "Should have been set"); |
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1168 set_phase(_parallel_workers->active_workers(), true /* concurrent */); |
342 | 1169 |
1170 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1171 if (parallel_marking_threads() > 0) { |
342 | 1172 _parallel_workers->run_task(&markingTask); |
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1173 } else { |
342 | 1174 markingTask.work(0); |
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1175 } |
342 | 1176 print_stats(); |
1177 } | |
1178 | |
1179 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1180 // world is stopped at this checkpoint | |
1181 assert(SafepointSynchronize::is_at_safepoint(), | |
1182 "world should be stopped"); | |
3979
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1183 |
342 | 1184 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1185 | |
1186 // If a full collection has happened, we shouldn't do this. | |
1187 if (has_aborted()) { | |
1188 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1189 return; | |
1190 } | |
1191 | |
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1192 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1193 |
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1194 if (VerifyDuringGC) { |
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1195 HandleMark hm; // handle scope |
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1196 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1197 Universe::heap()->prepare_for_verify(); |
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1198 Universe::verify(/* allow dirty */ true, |
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1199 /* silent */ false, |
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1200 /* option */ VerifyOption_G1UsePrevMarking); |
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1201 } |
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1202 |
342 | 1203 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1204 g1p->record_concurrent_mark_remark_start(); | |
1205 | |
1206 double start = os::elapsedTime(); | |
1207 | |
1208 checkpointRootsFinalWork(); | |
1209 | |
1210 double mark_work_end = os::elapsedTime(); | |
1211 | |
1212 weakRefsWork(clear_all_soft_refs); | |
1213 | |
1214 if (has_overflown()) { | |
1215 // Oops. We overflowed. Restart concurrent marking. | |
1216 _restart_for_overflow = true; | |
1217 // Clear the flag. We do not need it any more. | |
1218 clear_has_overflown(); | |
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1219 if (G1TraceMarkStackOverflow) { |
342 | 1220 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1221 } |
342 | 1222 } else { |
2149 | 1223 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1224 // We're done with marking. |
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1225 // This is the end of the marking cycle, we're expected all |
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1226 // threads to have SATB queues with active set to true. |
2149 | 1227 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1228 true /* expected_active */); | |
811 | 1229 |
1230 if (VerifyDuringGC) { | |
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1231 |
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1232 HandleMark hm; // handle scope |
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1233 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1234 Universe::heap()->prepare_for_verify(); |
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1235 Universe::verify(/* allow dirty */ true, |
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1236 /* silent */ false, |
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1237 /* option */ VerifyOption_G1UseNextMarking); |
811 | 1238 } |
2174
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1239 assert(!restart_for_overflow(), "sanity"); |
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1240 } |
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1241 |
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1242 // Reset the marking state if marking completed |
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1243 if (!restart_for_overflow()) { |
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1244 set_non_marking_state(); |
342 | 1245 } |
1246 | |
1247 #if VERIFY_OBJS_PROCESSED | |
1248 _scan_obj_cl.objs_processed = 0; | |
1249 ThreadLocalObjQueue::objs_enqueued = 0; | |
1250 #endif | |
1251 | |
1252 // Statistics | |
1253 double now = os::elapsedTime(); | |
1254 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1255 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1256 _remark_times.add((now - start) * 1000.0); | |
1257 | |
1258 g1p->record_concurrent_mark_remark_end(); | |
1259 } | |
1260 | |
1261 #define CARD_BM_TEST_MODE 0 | |
1262 | |
1263 class CalcLiveObjectsClosure: public HeapRegionClosure { | |
1264 | |
1265 CMBitMapRO* _bm; | |
1266 ConcurrentMark* _cm; | |
1267 bool _changed; | |
1268 bool _yield; | |
1269 size_t _words_done; | |
1270 size_t _tot_live; | |
1271 size_t _tot_used; | |
1272 size_t _regions_done; | |
1273 double _start_vtime_sec; | |
1274 | |
1275 BitMap* _region_bm; | |
1276 BitMap* _card_bm; | |
1277 intptr_t _bottom_card_num; | |
1278 bool _final; | |
1279 | |
1280 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
1281 for (intptr_t i = start_card_num; i <= last_card_num; i++) { | |
1282 #if CARD_BM_TEST_MODE | |
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1283 guarantee(_card_bm->at(i - _bottom_card_num), "Should already be set."); |
342 | 1284 #else |
1285 _card_bm->par_at_put(i - _bottom_card_num, 1); | |
1286 #endif | |
1287 } | |
1288 } | |
1289 | |
1290 public: | |
1291 CalcLiveObjectsClosure(bool final, | |
1292 CMBitMapRO *bm, ConcurrentMark *cm, | |
936 | 1293 BitMap* region_bm, BitMap* card_bm) : |
342 | 1294 _bm(bm), _cm(cm), _changed(false), _yield(true), |
1295 _words_done(0), _tot_live(0), _tot_used(0), | |
936 | 1296 _region_bm(region_bm), _card_bm(card_bm),_final(final), |
342 | 1297 _regions_done(0), _start_vtime_sec(0.0) |
1298 { | |
1299 _bottom_card_num = | |
1300 intptr_t(uintptr_t(G1CollectedHeap::heap()->reserved_region().start()) >> | |
1301 CardTableModRefBS::card_shift); | |
1302 } | |
1303 | |
829 | 1304 // It takes a region that's not empty (i.e., it has at least one |
1305 // live object in it and sets its corresponding bit on the region | |
1306 // bitmap to 1. If the region is "starts humongous" it will also set | |
1307 // to 1 the bits on the region bitmap that correspond to its | |
1308 // associated "continues humongous" regions. | |
1309 void set_bit_for_region(HeapRegion* hr) { | |
1310 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1311 | |
1312 size_t index = hr->hrs_index(); | |
1313 if (!hr->startsHumongous()) { | |
1314 // Normal (non-humongous) case: just set the bit. | |
1315 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
1316 } else { | |
1317 // Starts humongous case: calculate how many regions are part of | |
1318 // this humongous region and then set the bit range. It might | |
1319 // have been a bit more efficient to look at the object that | |
1320 // spans these humongous regions to calculate their number from | |
1321 // the object's size. However, it's a good idea to calculate | |
1322 // this based on the metadata itself, and not the region | |
1323 // contents, so that this code is not aware of what goes into | |
1324 // the humongous regions (in case this changes in the future). | |
1325 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1326 size_t end_index = index + 1; | |
831 | 1327 while (end_index < g1h->n_regions()) { |
1328 HeapRegion* chr = g1h->region_at(end_index); | |
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1329 if (!chr->continuesHumongous()) break; |
829 | 1330 end_index += 1; |
1331 } | |
1332 _region_bm->par_at_put_range((BitMap::idx_t) index, | |
1333 (BitMap::idx_t) end_index, true); | |
1334 } | |
1335 } | |
1336 | |
342 | 1337 bool doHeapRegion(HeapRegion* hr) { |
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1338 if (!_final && _regions_done == 0) { |
342 | 1339 _start_vtime_sec = os::elapsedVTime(); |
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1340 } |
342 | 1341 |
639 | 1342 if (hr->continuesHumongous()) { |
829 | 1343 // We will ignore these here and process them when their |
1344 // associated "starts humongous" region is processed (see | |
1345 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1346 // associated "starts humongous" region to have their bit set to | |
1347 // 1 since, due to the region chunking in the parallel region | |
1348 // iteration, a "continues humongous" region might be visited | |
1349 // before its associated "starts humongous". | |
639 | 1350 return false; |
1351 } | |
342 | 1352 |
1353 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
1354 HeapWord* start = hr->top_at_conc_mark_count(); | |
1355 assert(hr->bottom() <= start && start <= hr->end() && | |
1356 hr->bottom() <= nextTop && nextTop <= hr->end() && | |
1357 start <= nextTop, | |
1358 "Preconditions."); | |
1359 // Otherwise, record the number of word's we'll examine. | |
1360 size_t words_done = (nextTop - start); | |
1361 // Find the first marked object at or after "start". | |
1362 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
1363 size_t marked_bytes = 0; | |
1364 | |
1365 // Below, the term "card num" means the result of shifting an address | |
1366 // by the card shift -- address 0 corresponds to card number 0. One | |
1367 // must subtract the card num of the bottom of the heap to obtain a | |
1368 // card table index. | |
1369 // The first card num of the sequence of live cards currently being | |
1370 // constructed. -1 ==> no sequence. | |
1371 intptr_t start_card_num = -1; | |
1372 // The last card num of the sequence of live cards currently being | |
1373 // constructed. -1 ==> no sequence. | |
1374 intptr_t last_card_num = -1; | |
1375 | |
1376 while (start < nextTop) { | |
1377 if (_yield && _cm->do_yield_check()) { | |
1378 // We yielded. It might be for a full collection, in which case | |
1379 // all bets are off; terminate the traversal. | |
1380 if (_cm->has_aborted()) { | |
1381 _changed = false; | |
1382 return true; | |
1383 } else { | |
1384 // Otherwise, it might be a collection pause, and the region | |
1385 // we're looking at might be in the collection set. We'll | |
1386 // abandon this region. | |
1387 return false; | |
1388 } | |
1389 } | |
1390 oop obj = oop(start); | |
1391 int obj_sz = obj->size(); | |
1392 // The card num of the start of the current object. | |
1393 intptr_t obj_card_num = | |
1394 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
1395 | |
1396 HeapWord* obj_last = start + obj_sz - 1; | |
1397 intptr_t obj_last_card_num = | |
1398 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
1399 | |
1400 if (obj_card_num != last_card_num) { | |
1401 if (start_card_num == -1) { | |
1402 assert(last_card_num == -1, "Both or neither."); | |
1403 start_card_num = obj_card_num; | |
1404 } else { | |
1405 assert(last_card_num != -1, "Both or neither."); | |
1406 assert(obj_card_num >= last_card_num, "Inv"); | |
1407 if ((obj_card_num - last_card_num) > 1) { | |
1408 // Mark the last run, and start a new one. | |
1409 mark_card_num_range(start_card_num, last_card_num); | |
1410 start_card_num = obj_card_num; | |
1411 } | |
1412 } | |
1413 #if CARD_BM_TEST_MODE | |
1414 /* | |
1415 gclog_or_tty->print_cr("Setting bits from %d/%d.", | |
1416 obj_card_num - _bottom_card_num, | |
1417 obj_last_card_num - _bottom_card_num); | |
1418 */ | |
1419 for (intptr_t j = obj_card_num; j <= obj_last_card_num; j++) { | |
1420 _card_bm->par_at_put(j - _bottom_card_num, 1); | |
1421 } | |
1422 #endif | |
1423 } | |
1424 // In any case, we set the last card num. | |
1425 last_card_num = obj_last_card_num; | |
1426 | |
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1427 marked_bytes += (size_t)obj_sz * HeapWordSize; |
342 | 1428 // Find the next marked object after this one. |
1429 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
1430 _changed = true; | |
1431 } | |
1432 // Handle the last range, if any. | |
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1433 if (start_card_num != -1) { |
342 | 1434 mark_card_num_range(start_card_num, last_card_num); |
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1435 } |
342 | 1436 if (_final) { |
1437 // Mark the allocated-since-marking portion... | |
1438 HeapWord* tp = hr->top(); | |
1439 if (nextTop < tp) { | |
1440 start_card_num = | |
1441 intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); | |
1442 last_card_num = | |
1443 intptr_t(uintptr_t(tp) >> CardTableModRefBS::card_shift); | |
1444 mark_card_num_range(start_card_num, last_card_num); | |
1445 // This definitely means the region has live objects. | |
829 | 1446 set_bit_for_region(hr); |
342 | 1447 } |
1448 } | |
1449 | |
1450 hr->add_to_marked_bytes(marked_bytes); | |
1451 // Update the live region bitmap. | |
1452 if (marked_bytes > 0) { | |
829 | 1453 set_bit_for_region(hr); |
342 | 1454 } |
1455 hr->set_top_at_conc_mark_count(nextTop); | |
1456 _tot_live += hr->next_live_bytes(); | |
1457 _tot_used += hr->used(); | |
1458 _words_done = words_done; | |
1459 | |
1460 if (!_final) { | |
1461 ++_regions_done; | |
1462 if (_regions_done % 10 == 0) { | |
1463 double end_vtime_sec = os::elapsedVTime(); | |
1464 double elapsed_vtime_sec = end_vtime_sec - _start_vtime_sec; | |
1465 if (elapsed_vtime_sec > (10.0 / 1000.0)) { | |
1466 jlong sleep_time_ms = | |
1467 (jlong) (elapsed_vtime_sec * _cm->cleanup_sleep_factor() * 1000.0); | |
1468 os::sleep(Thread::current(), sleep_time_ms, false); | |
1469 _start_vtime_sec = end_vtime_sec; | |
1470 } | |
1471 } | |
1472 } | |
1473 | |
1474 return false; | |
1475 } | |
1476 | |
1477 bool changed() { return _changed; } | |
1478 void reset() { _changed = false; _words_done = 0; } | |
1479 void no_yield() { _yield = false; } | |
1480 size_t words_done() { return _words_done; } | |
1481 size_t tot_live() { return _tot_live; } | |
1482 size_t tot_used() { return _tot_used; } | |
1483 }; | |
1484 | |
1485 | |
1486 void ConcurrentMark::calcDesiredRegions() { | |
1487 _region_bm.clear(); | |
1488 _card_bm.clear(); | |
1489 CalcLiveObjectsClosure calccl(false /*final*/, | |
1490 nextMarkBitMap(), this, | |
936 | 1491 &_region_bm, &_card_bm); |
342 | 1492 G1CollectedHeap *g1h = G1CollectedHeap::heap(); |
1493 g1h->heap_region_iterate(&calccl); | |
1494 | |
1495 do { | |
1496 calccl.reset(); | |
1497 g1h->heap_region_iterate(&calccl); | |
1498 } while (calccl.changed()); | |
1499 } | |
1500 | |
1501 class G1ParFinalCountTask: public AbstractGangTask { | |
1502 protected: | |
1503 G1CollectedHeap* _g1h; | |
1504 CMBitMap* _bm; | |
1505 size_t _n_workers; | |
1506 size_t *_live_bytes; | |
1507 size_t *_used_bytes; | |
1508 BitMap* _region_bm; | |
1509 BitMap* _card_bm; | |
1510 public: | |
1511 G1ParFinalCountTask(G1CollectedHeap* g1h, CMBitMap* bm, | |
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1512 BitMap* region_bm, BitMap* card_bm) |
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1513 : AbstractGangTask("G1 final counting"), _g1h(g1h), |
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1514 _bm(bm), _region_bm(region_bm), _card_bm(card_bm), |
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1515 _n_workers(0) |
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1516 { |
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1517 // Use the value already set as the number of active threads |
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1518 // in the call to run_task(). Needed for the allocation of |
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1519 // _live_bytes and _used_bytes. |
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1520 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1521 assert( _g1h->workers()->active_workers() > 0, |
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1522 "Should have been previously set"); |
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1523 _n_workers = _g1h->workers()->active_workers(); |
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1524 } else { |
342 | 1525 _n_workers = 1; |
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1526 } |
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1527 |
342 | 1528 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); |
1529 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
1530 } | |
1531 | |
1532 ~G1ParFinalCountTask() { | |
1533 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
1534 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
1535 } | |
1536 | |
1537 void work(int i) { | |
1538 CalcLiveObjectsClosure calccl(true /*final*/, | |
1539 _bm, _g1h->concurrent_mark(), | |
936 | 1540 _region_bm, _card_bm); |
342 | 1541 calccl.no_yield(); |
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1542 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1543 _g1h->heap_region_par_iterate_chunked(&calccl, i, |
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1544 (int) _n_workers, |
355 | 1545 HeapRegion::FinalCountClaimValue); |
342 | 1546 } else { |
1547 _g1h->heap_region_iterate(&calccl); | |
1548 } | |
1549 assert(calccl.complete(), "Shouldn't have yielded!"); | |
1550 | |
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1551 assert((size_t) i < _n_workers, "invariant"); |
342 | 1552 _live_bytes[i] = calccl.tot_live(); |
1553 _used_bytes[i] = calccl.tot_used(); | |
1554 } | |
1555 size_t live_bytes() { | |
1556 size_t live_bytes = 0; | |
1557 for (size_t i = 0; i < _n_workers; ++i) | |
1558 live_bytes += _live_bytes[i]; | |
1559 return live_bytes; | |
1560 } | |
1561 size_t used_bytes() { | |
1562 size_t used_bytes = 0; | |
1563 for (size_t i = 0; i < _n_workers; ++i) | |
1564 used_bytes += _used_bytes[i]; | |
1565 return used_bytes; | |
1566 } | |
1567 }; | |
1568 | |
1569 class G1ParNoteEndTask; | |
1570 | |
1571 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1572 G1CollectedHeap* _g1; | |
1573 int _worker_num; | |
1574 size_t _max_live_bytes; | |
1575 size_t _regions_claimed; | |
1576 size_t _freed_bytes; | |
2173 | 1577 FreeRegionList* _local_cleanup_list; |
4072 | 1578 OldRegionSet* _old_proxy_set; |
2173 | 1579 HumongousRegionSet* _humongous_proxy_set; |
1580 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1581 double _claimed_region_time; |
1582 double _max_region_time; | |
1583 | |
1584 public: | |
1585 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1586 int worker_num, |
1587 FreeRegionList* local_cleanup_list, | |
4072 | 1588 OldRegionSet* old_proxy_set, |
2173 | 1589 HumongousRegionSet* humongous_proxy_set, |
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1590 HRRSCleanupTask* hrrs_cleanup_task) : |
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1591 _g1(g1), _worker_num(worker_num), |
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1592 _max_live_bytes(0), _regions_claimed(0), |
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1593 _freed_bytes(0), |
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1594 _claimed_region_time(0.0), _max_region_time(0.0), |
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1595 _local_cleanup_list(local_cleanup_list), |
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1596 _old_proxy_set(old_proxy_set), |
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1597 _humongous_proxy_set(humongous_proxy_set), |
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1598 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1599 |
342 | 1600 size_t freed_bytes() { return _freed_bytes; } |
1601 | |
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1602 bool doHeapRegion(HeapRegion *hr) { |
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1603 // We use a claim value of zero here because all regions |
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1604 // were claimed with value 1 in the FinalCount task. |
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1605 hr->reset_gc_time_stamp(); |
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1606 if (!hr->continuesHumongous()) { |
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1607 double start = os::elapsedTime(); |
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1608 _regions_claimed++; |
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1609 hr->note_end_of_marking(); |
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1610 _max_live_bytes += hr->max_live_bytes(); |
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1611 _g1->free_region_if_empty(hr, |
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1612 &_freed_bytes, |
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1613 _local_cleanup_list, |
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1614 _old_proxy_set, |
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1615 _humongous_proxy_set, |
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1616 _hrrs_cleanup_task, |
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1617 true /* par */); |
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1618 double region_time = (os::elapsedTime() - start); |
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1619 _claimed_region_time += region_time; |
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1620 if (region_time > _max_region_time) { |
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1621 _max_region_time = region_time; |
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1622 } |
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1623 } |
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1624 return false; |
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1625 } |
342 | 1626 |
1627 size_t max_live_bytes() { return _max_live_bytes; } | |
1628 size_t regions_claimed() { return _regions_claimed; } | |
1629 double claimed_region_time_sec() { return _claimed_region_time; } | |
1630 double max_region_time_sec() { return _max_region_time; } | |
1631 }; | |
1632 | |
1633 class G1ParNoteEndTask: public AbstractGangTask { | |
1634 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1635 |
342 | 1636 protected: |
1637 G1CollectedHeap* _g1h; | |
1638 size_t _max_live_bytes; | |
1639 size_t _freed_bytes; | |
2152 | 1640 FreeRegionList* _cleanup_list; |
1641 | |
342 | 1642 public: |
1643 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1644 FreeRegionList* cleanup_list) : |
342 | 1645 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1646 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1647 |
1648 void work(int i) { | |
1649 double start = os::elapsedTime(); | |
2173 | 1650 FreeRegionList local_cleanup_list("Local Cleanup List"); |
4072 | 1651 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
2173 | 1652 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
1653 HRRSCleanupTask hrrs_cleanup_task; | |
1654 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, i, &local_cleanup_list, | |
4072 | 1655 &old_proxy_set, |
2173 | 1656 &humongous_proxy_set, |
1657 &hrrs_cleanup_task); | |
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1658 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1659 _g1h->heap_region_par_iterate_chunked(&g1_note_end, i, |
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1660 _g1h->workers()->active_workers(), |
355 | 1661 HeapRegion::NoteEndClaimValue); |
342 | 1662 } else { |
1663 _g1h->heap_region_iterate(&g1_note_end); | |
1664 } | |
1665 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1666 | |
2152 | 1667 // Now update the lists |
1668 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1669 NULL /* free_list */, | |
4072 | 1670 &old_proxy_set, |
2173 | 1671 &humongous_proxy_set, |
2152 | 1672 true /* par */); |
342 | 1673 { |
1674 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1675 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1676 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1677 |
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1678 // If we iterate over the global cleanup list at the end of |
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1679 // cleanup to do this printing we will not guarantee to only |
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1680 // generate output for the newly-reclaimed regions (the list |
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1681 // might not be empty at the beginning of cleanup; we might |
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1682 // still be working on its previous contents). So we do the |
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1683 // printing here, before we append the new regions to the global |
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1684 // cleanup list. |
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1685 |
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1686 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1687 if (hr_printer->is_active()) { |
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1688 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1689 while (iter.more_available()) { |
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1690 HeapRegion* hr = iter.get_next(); |
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1691 hr_printer->cleanup(hr); |
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1692 } |
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1693 } |
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1694 |
2173 | 1695 _cleanup_list->add_as_tail(&local_cleanup_list); |
1696 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1697 | |
1698 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1699 } |
1700 double end = os::elapsedTime(); | |
1701 if (G1PrintParCleanupStats) { | |
1702 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
1703 "claimed %d regions (tot = %8.3f ms, max = %8.3f ms).\n", | |
1704 i, start, end, (end-start)*1000.0, | |
1705 g1_note_end.regions_claimed(), | |
1706 g1_note_end.claimed_region_time_sec()*1000.0, | |
1707 g1_note_end.max_region_time_sec()*1000.0); | |
1708 } | |
1709 } | |
1710 size_t max_live_bytes() { return _max_live_bytes; } | |
1711 size_t freed_bytes() { return _freed_bytes; } | |
1712 }; | |
1713 | |
1714 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1715 protected: | |
1716 G1RemSet* _g1rs; | |
1717 BitMap* _region_bm; | |
1718 BitMap* _card_bm; | |
1719 public: | |
1720 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1721 BitMap* region_bm, BitMap* card_bm) : | |
1722 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
1723 _region_bm(region_bm), _card_bm(card_bm) | |
1724 {} | |
1725 | |
1726 void work(int i) { | |
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1727 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1728 _g1rs->scrub_par(_region_bm, _card_bm, i, |
1729 HeapRegion::ScrubRemSetClaimValue); | |
342 | 1730 } else { |
1731 _g1rs->scrub(_region_bm, _card_bm); | |
1732 } | |
1733 } | |
1734 | |
1735 }; | |
1736 | |
1737 void ConcurrentMark::cleanup() { | |
1738 // world is stopped at this checkpoint | |
1739 assert(SafepointSynchronize::is_at_safepoint(), | |
1740 "world should be stopped"); | |
1741 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1742 | |
1743 // If a full collection has happened, we shouldn't do this. | |
1744 if (has_aborted()) { | |
1745 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1746 return; | |
1747 } | |
1748 | |
4072 | 1749 HRSPhaseSetter x(HRSPhaseCleanup); |
2152 | 1750 g1h->verify_region_sets_optional(); |
1751 | |
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1752 if (VerifyDuringGC) { |
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1753 HandleMark hm; // handle scope |
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1754 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1755 Universe::heap()->prepare_for_verify(); |
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1756 Universe::verify(/* allow dirty */ true, |
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1757 /* silent */ false, |
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1758 /* option */ VerifyOption_G1UsePrevMarking); |
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1759 } |
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1760 |
342 | 1761 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1762 g1p->record_concurrent_mark_cleanup_start(); | |
1763 | |
1764 double start = os::elapsedTime(); | |
1765 | |
2173 | 1766 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1767 | |
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1768 g1h->set_par_threads(); |
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1769 size_t n_workers = g1h->n_par_threads(); |
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1770 |
342 | 1771 // Do counting once more with the world stopped for good measure. |
1772 G1ParFinalCountTask g1_par_count_task(g1h, nextMarkBitMap(), | |
1773 &_region_bm, &_card_bm); | |
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1774 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1775 assert(g1h->check_heap_region_claim_values( |
1776 HeapRegion::InitialClaimValue), | |
1777 "sanity check"); | |
1778 | |
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1779 assert(g1h->n_par_threads() == (int) n_workers, |
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1780 "Should not have been reset"); |
342 | 1781 g1h->workers()->run_task(&g1_par_count_task); |
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1782 // Done with the parallel phase so reset to 0. |
342 | 1783 g1h->set_par_threads(0); |
355 | 1784 |
1785 assert(g1h->check_heap_region_claim_values( | |
1786 HeapRegion::FinalCountClaimValue), | |
1787 "sanity check"); | |
342 | 1788 } else { |
1789 g1_par_count_task.work(0); | |
1790 } | |
1791 | |
1792 size_t known_garbage_bytes = | |
1793 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
1794 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
1795 | |
1796 size_t start_used_bytes = g1h->used(); | |
1797 _at_least_one_mark_complete = true; | |
1798 g1h->set_marking_complete(); | |
1799 | |
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1800 ergo_verbose4(ErgoConcCycles, |
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1801 "finish cleanup", |
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1802 ergo_format_byte("occupancy") |
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1803 ergo_format_byte("capacity") |
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1804 ergo_format_byte_perc("known garbage"), |
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1805 start_used_bytes, g1h->capacity(), |
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1806 known_garbage_bytes, |
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1807 ((double) known_garbage_bytes / (double) g1h->capacity()) * 100.0); |
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1808 |
342 | 1809 double count_end = os::elapsedTime(); |
1810 double this_final_counting_time = (count_end - start); | |
1811 if (G1PrintParCleanupStats) { | |
1812 gclog_or_tty->print_cr("Cleanup:"); | |
1813 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
1814 this_final_counting_time*1000.0); | |
1815 } | |
1816 _total_counting_time += this_final_counting_time; | |
1817 | |
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1818 if (G1PrintRegionLivenessInfo) { |
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1819 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1820 _g1h->heap_region_iterate(&cl); |
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1821 } |
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1822 |
342 | 1823 // Install newly created mark bitMap as "prev". |
1824 swapMarkBitMaps(); | |
1825 | |
1826 g1h->reset_gc_time_stamp(); | |
1827 | |
1828 // Note end of marking in all heap regions. | |
1829 double note_end_start = os::elapsedTime(); | |
2152 | 1830 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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1831 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1832 g1h->set_par_threads((int)n_workers); |
342 | 1833 g1h->workers()->run_task(&g1_par_note_end_task); |
1834 g1h->set_par_threads(0); | |
355 | 1835 |
1836 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
1837 "sanity check"); | |
342 | 1838 } else { |
1839 g1_par_note_end_task.work(0); | |
1840 } | |
2152 | 1841 |
1842 if (!cleanup_list_is_empty()) { | |
1843 // The cleanup list is not empty, so we'll have to process it | |
1844 // concurrently. Notify anyone else that might be wanting free | |
1845 // regions that there will be more free regions coming soon. | |
1846 g1h->set_free_regions_coming(); | |
1847 } | |
342 | 1848 double note_end_end = os::elapsedTime(); |
1849 if (G1PrintParCleanupStats) { | |
1850 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
1851 (note_end_end - note_end_start)*1000.0); | |
1852 } | |
1853 | |
355 | 1854 |
342 | 1855 // call below, since it affects the metric by which we sort the heap |
1856 // regions. | |
1857 if (G1ScrubRemSets) { | |
1858 double rs_scrub_start = os::elapsedTime(); | |
1859 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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1860 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1861 g1h->set_par_threads((int)n_workers); |
342 | 1862 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
1863 g1h->set_par_threads(0); | |
355 | 1864 |
1865 assert(g1h->check_heap_region_claim_values( | |
1866 HeapRegion::ScrubRemSetClaimValue), | |
1867 "sanity check"); | |
342 | 1868 } else { |
1869 g1_par_scrub_rs_task.work(0); | |
1870 } | |
1871 | |
1872 double rs_scrub_end = os::elapsedTime(); | |
1873 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
1874 _total_rs_scrub_time += this_rs_scrub_time; | |
1875 } | |
1876 | |
1877 // this will also free any regions totally full of garbage objects, | |
1878 // and sort the regions. | |
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1879 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 1880 |
1881 // Statistics. | |
1882 double end = os::elapsedTime(); | |
1883 _cleanup_times.add((end - start) * 1000.0); | |
1884 | |
1885 // G1CollectedHeap::heap()->print(); | |
1886 // gclog_or_tty->print_cr("HEAP GC TIME STAMP : %d", | |
1887 // G1CollectedHeap::heap()->get_gc_time_stamp()); | |
1888 | |
1889 if (PrintGC || PrintGCDetails) { | |
1890 g1h->print_size_transition(gclog_or_tty, | |
1891 start_used_bytes, | |
1892 g1h->used(), | |
1893 g1h->capacity()); | |
1894 } | |
1895 | |
1896 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
1897 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
1898 | |
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1899 // Clean up will have freed any regions completely full of garbage. |
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1900 // Update the soft reference policy with the new heap occupancy. |
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1901 Universe::update_heap_info_at_gc(); |
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1902 |
342 | 1903 // We need to make this be a "collection" so any collection pause that |
1904 // races with it goes around and waits for completeCleanup to finish. | |
1905 g1h->increment_total_collections(); | |
1906 | |
751 | 1907 if (VerifyDuringGC) { |
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1908 HandleMark hm; // handle scope |
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1909 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1910 Universe::heap()->prepare_for_verify(); |
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1911 Universe::verify(/* allow dirty */ true, |
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1912 /* silent */ false, |
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1913 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 1914 } |
2152 | 1915 |
1916 g1h->verify_region_sets_optional(); | |
342 | 1917 } |
1918 | |
1919 void ConcurrentMark::completeCleanup() { | |
1920 if (has_aborted()) return; | |
1921 | |
2152 | 1922 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1923 | |
1924 _cleanup_list.verify_optional(); | |
2361 | 1925 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 1926 |
1927 if (G1ConcRegionFreeingVerbose) { | |
1928 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
1929 "cleanup list has "SIZE_FORMAT" entries", | |
1930 _cleanup_list.length()); | |
1931 } | |
1932 | |
1933 // Noone else should be accessing the _cleanup_list at this point, | |
1934 // so it's not necessary to take any locks | |
1935 while (!_cleanup_list.is_empty()) { | |
1936 HeapRegion* hr = _cleanup_list.remove_head(); | |
1937 assert(hr != NULL, "the list was not empty"); | |
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1938 hr->par_clear(); |
2361 | 1939 tmp_free_list.add_as_tail(hr); |
2152 | 1940 |
1941 // Instead of adding one region at a time to the secondary_free_list, | |
1942 // we accumulate them in the local list and move them a few at a | |
1943 // time. This also cuts down on the number of notify_all() calls | |
1944 // we do during this process. We'll also append the local list when | |
1945 // _cleanup_list is empty (which means we just removed the last | |
1946 // region from the _cleanup_list). | |
2361 | 1947 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 1948 _cleanup_list.is_empty()) { |
1949 if (G1ConcRegionFreeingVerbose) { | |
1950 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
1951 "appending "SIZE_FORMAT" entries to the " | |
1952 "secondary_free_list, clean list still has " | |
1953 SIZE_FORMAT" entries", | |
2361 | 1954 tmp_free_list.length(), |
2152 | 1955 _cleanup_list.length()); |
342 | 1956 } |
2152 | 1957 |
1958 { | |
1959 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 1960 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 1961 SecondaryFreeList_lock->notify_all(); |
1962 } | |
1963 | |
1964 if (G1StressConcRegionFreeing) { | |
1965 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
1966 os::sleep(Thread::current(), (jlong) 1, false); | |
1967 } | |
1968 } | |
342 | 1969 } |
1970 } | |
2361 | 1971 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 1972 } |
1973 | |
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1974 // Support closures for reference procssing in G1 |
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1975 |
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1976 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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1977 HeapWord* addr = (HeapWord*)obj; |
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1978 return addr != NULL && |
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1979 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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1980 } |
342 | 1981 |
1982 class G1CMKeepAliveClosure: public OopClosure { | |
1983 G1CollectedHeap* _g1; | |
1984 ConcurrentMark* _cm; | |
1985 CMBitMap* _bitMap; | |
1986 public: | |
1987 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm, | |
1988 CMBitMap* bitMap) : | |
1989 _g1(g1), _cm(cm), | |
1990 _bitMap(bitMap) {} | |
1991 | |
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1992 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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1993 virtual void do_oop( oop* p) { do_oop_work(p); } |
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1994 |
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1995 template <class T> void do_oop_work(T* p) { |
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1996 oop obj = oopDesc::load_decode_heap_oop(p); |
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1997 HeapWord* addr = (HeapWord*)obj; |
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1998 |
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1999 if (_cm->verbose_high()) { |
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2000 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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2001 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2002 p, (void*) obj); |
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2003 } |
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2004 |
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2005 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
342 | 2006 _bitMap->mark(addr); |
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2007 _cm->mark_stack_push(obj); |
342 | 2008 } |
2009 } | |
2010 }; | |
2011 | |
2012 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
2013 CMMarkStack* _markStack; | |
2014 CMBitMap* _bitMap; | |
2015 G1CMKeepAliveClosure* _oopClosure; | |
2016 public: | |
2017 G1CMDrainMarkingStackClosure(CMBitMap* bitMap, CMMarkStack* markStack, | |
2018 G1CMKeepAliveClosure* oopClosure) : | |
2019 _bitMap(bitMap), | |
2020 _markStack(markStack), | |
2021 _oopClosure(oopClosure) | |
2022 {} | |
2023 | |
2024 void do_void() { | |
2025 _markStack->drain((OopClosure*)_oopClosure, _bitMap, false); | |
2026 } | |
2027 }; | |
2028 | |
2174
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2029 // 'Keep Alive' closure used by parallel reference processing. |
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2030 // An instance of this closure is used in the parallel reference processing |
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2031 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2032 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2033 // placed on to discovered ref lists once so we can mark and push with no |
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2034 // need to check whether the object has already been marked. Using the |
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2035 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2036 // operating on the global mark stack. This means that an individual |
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2037 // worker would be doing lock-free pushes while it processes its own |
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2038 // discovered ref list followed by drain call. If the discovered ref lists |
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2039 // are unbalanced then this could cause interference with the other |
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2040 // workers. Using a CMTask (and its embedded local data structures) |
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2041 // avoids that potential interference. |
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2042 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2043 ConcurrentMark* _cm; |
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2044 CMTask* _task; |
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2045 int _ref_counter_limit; |
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2046 int _ref_counter; |
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2047 public: |
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2048 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2049 _cm(cm), _task(task), |
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2050 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
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2051 assert(_ref_counter_limit > 0, "sanity"); |
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2052 _ref_counter = _ref_counter_limit; |
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2053 } |
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2054 |
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2055 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2056 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2057 |
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2058 template <class T> void do_oop_work(T* p) { |
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2059 if (!_cm->has_overflown()) { |
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2060 oop obj = oopDesc::load_decode_heap_oop(p); |
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2061 if (_cm->verbose_high()) { |
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2062 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2063 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2064 _task->task_id(), p, (void*) obj); |
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2065 } |
2174
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2066 |
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2067 _task->deal_with_reference(obj); |
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2068 _ref_counter--; |
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2069 |
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2070 if (_ref_counter == 0) { |
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2071 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2072 // reachable from them on to the local stack (and possibly the global stack). |
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2073 // Call do_marking_step() to process these entries. We call the routine in a |
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2074 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2075 // with the entries that we've pushed as a result of the deal_with_reference |
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2076 // calls above) or we overflow. |
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2077 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2078 // while there may still be some work to do. (See the comment at the |
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2079 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2080 // is reaching the specified time target.) It is only when |
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2081 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2082 // that the marking has completed. |
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2083 do { |
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2084 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2085 _task->do_marking_step(mark_step_duration_ms, |
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2086 false /* do_stealing */, |
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2087 false /* do_termination */); |
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2088 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2089 _ref_counter = _ref_counter_limit; |
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2090 } |
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2091 } else { |
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2092 if (_cm->verbose_high()) { |
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2093 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
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2094 } |
2174
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2095 } |
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2096 } |
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2097 }; |
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2098 |
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2099 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
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2100 ConcurrentMark* _cm; |
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2101 CMTask* _task; |
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2102 public: |
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2103 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
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2104 _cm(cm), _task(task) |
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2105 {} |
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2106 |
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2107 void do_void() { |
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2108 do { |
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2109 if (_cm->verbose_high()) { |
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2110 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
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2111 _task->task_id()); |
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2112 } |
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2113 |
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2114 // We call CMTask::do_marking_step() to completely drain the local and |
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2115 // global marking stacks. The routine is called in a loop, which we'll |
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2116 // exit if there's nothing more to do (i.e. we'completely drained the |
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2117 // entries that were pushed as a result of applying the |
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2118 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
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2119 // lists above) or we overflow the global marking stack. |
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2120 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2121 // while there may still be some work to do. (See the comment at the |
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2122 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2123 // is reaching the specified time target.) It is only when |
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2124 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2125 // that the marking has completed. |
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2126 |
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2127 _task->do_marking_step(1000000000.0 /* something very large */, |
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2128 true /* do_stealing */, |
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2129 true /* do_termination */); |
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2130 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2131 } |
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2132 }; |
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2133 |
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2134 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2135 // reference processing at the end of G1 concurrent marking |
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2136 |
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2137 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
2174
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2138 private: |
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2139 G1CollectedHeap* _g1h; |
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2140 ConcurrentMark* _cm; |
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2141 WorkGang* _workers; |
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2142 int _active_workers; |
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2143 |
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2144 public: |
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2145 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
2174
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2146 ConcurrentMark* cm, |
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2147 WorkGang* workers, |
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2148 int n_workers) : |
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2149 _g1h(g1h), _cm(cm), |
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2150 _workers(workers), _active_workers(n_workers) { } |
2174
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2151 |
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2152 // Executes the given task using concurrent marking worker threads. |
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2153 virtual void execute(ProcessTask& task); |
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2154 virtual void execute(EnqueueTask& task); |
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2155 }; |
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2156 |
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2157 class G1CMRefProcTaskProxy: public AbstractGangTask { |
2174
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2158 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2159 ProcessTask& _proc_task; |
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2160 G1CollectedHeap* _g1h; |
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2161 ConcurrentMark* _cm; |
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2162 |
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2163 public: |
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2164 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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2165 G1CollectedHeap* g1h, |
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2166 ConcurrentMark* cm) : |
2174
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2167 AbstractGangTask("Process reference objects in parallel"), |
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2168 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
2174
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2169 |
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2170 virtual void work(int i) { |
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2171 CMTask* marking_task = _cm->task(i); |
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2172 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2173 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
2174
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2174 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2175 |
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2176 _proc_task.work(i, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2177 } |
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2178 }; |
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2179 |
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2180 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
2174
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2181 assert(_workers != NULL, "Need parallel worker threads."); |
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2182 |
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2183 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
2174
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2184 |
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2185 // We need to reset the phase for each task execution so that |
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2186 // the termination protocol of CMTask::do_marking_step works. |
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2187 _cm->set_phase(_active_workers, false /* concurrent */); |
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2188 _g1h->set_par_threads(_active_workers); |
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2189 _workers->run_task(&proc_task_proxy); |
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2190 _g1h->set_par_threads(0); |
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2191 } |
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2192 |
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2193 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
2174
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2194 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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2195 EnqueueTask& _enq_task; |
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|
2196 |
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|
2197 public: |
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2198 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
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2199 AbstractGangTask("Enqueue reference objects in parallel"), |
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2200 _enq_task(enq_task) { } |
2174
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|
2201 |
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|
2202 virtual void work(int i) { |
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|
2203 _enq_task.work(i); |
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|
2204 } |
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|
2205 }; |
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2206 |
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2207 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
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2208 assert(_workers != NULL, "Need parallel worker threads."); |
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2209 |
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2210 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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2211 |
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2212 _g1h->set_par_threads(_active_workers); |
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|
2213 _workers->run_task(&enq_task_proxy); |
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2214 _g1h->set_par_threads(0); |
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|
2215 } |
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|
2216 |
342 | 2217 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
2218 ResourceMark rm; | |
2219 HandleMark hm; | |
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2220 |
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2221 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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2222 |
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2223 // Is alive closure. |
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|
2224 G1CMIsAliveClosure g1_is_alive(g1h); |
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|
2225 |
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2226 // Inner scope to exclude the cleaning of the string and symbol |
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|
2227 // tables from the displayed time. |
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|
2228 { |
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|
2229 bool verbose = PrintGC && PrintGCDetails; |
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|
2230 if (verbose) { |
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|
2231 gclog_or_tty->put(' '); |
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|
2232 } |
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|
2233 TraceTime t("GC ref-proc", verbose, false, gclog_or_tty); |
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2234 |
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2235 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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2236 |
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2237 // See the comment in G1CollectedHeap::ref_processing_init() |
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|
2238 // about how reference processing currently works in G1. |
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|
2239 |
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|
2240 // Process weak references. |
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|
2241 rp->setup_policy(clear_all_soft_refs); |
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|
2242 assert(_markStack.isEmpty(), "mark stack should be empty"); |
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|
2243 |
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2244 G1CMKeepAliveClosure g1_keep_alive(g1h, this, nextMarkBitMap()); |
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|
2245 G1CMDrainMarkingStackClosure |
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|
2246 g1_drain_mark_stack(nextMarkBitMap(), &_markStack, &g1_keep_alive); |
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2247 |
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2248 // We use the work gang from the G1CollectedHeap and we utilize all |
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2249 // the worker threads. |
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|
2250 int active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1; |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
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|
2251 active_workers = MAX2(MIN2(active_workers, (int)_max_task_num), 1); |
1847b501ae74
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parents:
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diff
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|
2252 |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2253 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
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|
2254 g1h->workers(), active_workers); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
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|
2255 |
1847b501ae74
7068215: G1: Print reference processing time during remark
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diff
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|
2256 if (rp->processing_is_mt()) { |
1847b501ae74
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parents:
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diff
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|
2257 // Set the degree of MT here. If the discovery is done MT, there |
1847b501ae74
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parents:
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diff
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|
2258 // may have been a different number of threads doing the discovery |
1847b501ae74
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diff
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|
2259 // and a different number of discovered lists may have Ref objects. |
1847b501ae74
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parents:
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diff
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|
2260 // That is OK as long as the Reference lists are balanced (see |
1847b501ae74
7068215: G1: Print reference processing time during remark
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parents:
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diff
changeset
|
2261 // balance_all_queues() and balance_queues()). |
1847b501ae74
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diff
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|
2262 rp->set_active_mt_degree(active_workers); |
1847b501ae74
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diff
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|
2263 |
1847b501ae74
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|
2264 rp->process_discovered_references(&g1_is_alive, |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2265 &g1_keep_alive, |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2266 &g1_drain_mark_stack, |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2267 &par_task_executor); |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
2268 |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
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parents:
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diff
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|
2269 // The work routines of the parallel keep_alive and drain_marking_stack |
1847b501ae74
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parents:
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diff
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|
2270 // will set the has_overflown flag if we overflow the global marking |
1847b501ae74
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parents:
3914
diff
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|
2271 // stack. |
1847b501ae74
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parents:
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diff
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|
2272 } else { |
1847b501ae74
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diff
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|
2273 rp->process_discovered_references(&g1_is_alive, |
1847b501ae74
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parents:
3914
diff
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|
2274 &g1_keep_alive, |
1847b501ae74
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parents:
3914
diff
changeset
|
2275 &g1_drain_mark_stack, |
1847b501ae74
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parents:
3914
diff
changeset
|
2276 NULL); |
1847b501ae74
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parents:
3914
diff
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|
2277 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
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parents:
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diff
changeset
|
2278 |
1847b501ae74
7068215: G1: Print reference processing time during remark
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3914
diff
changeset
|
2279 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
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parents:
3914
diff
changeset
|
2280 "mark stack should be empty (unless it overflowed)"); |
1847b501ae74
7068215: G1: Print reference processing time during remark
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3914
diff
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|
2281 if (_markStack.overflow()) { |
1847b501ae74
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parents:
3914
diff
changeset
|
2282 // Should have been done already when we tried to push an |
1847b501ae74
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parents:
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diff
changeset
|
2283 // entry on to the global mark stack. But let's do it again. |
1847b501ae74
7068215: G1: Print reference processing time during remark
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parents:
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diff
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|
2284 set_has_overflown(); |
1847b501ae74
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parents:
3914
diff
changeset
|
2285 } |
1847b501ae74
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parents:
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diff
changeset
|
2286 |
1847b501ae74
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3914
diff
changeset
|
2287 if (rp->processing_is_mt()) { |
1847b501ae74
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parents:
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diff
changeset
|
2288 assert(rp->num_q() == active_workers, "why not"); |
1847b501ae74
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diff
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|
2289 rp->enqueue_discovered_references(&par_task_executor); |
1847b501ae74
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parents:
3914
diff
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|
2290 } else { |
1847b501ae74
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3914
diff
changeset
|
2291 rp->enqueue_discovered_references(); |
1847b501ae74
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parents:
3914
diff
changeset
|
2292 } |
1847b501ae74
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parents:
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diff
changeset
|
2293 |
1847b501ae74
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3914
diff
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|
2294 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
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|
2295 assert(!rp->discovery_enabled(), "Post condition"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2296 } |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2297 |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2298 // Now clean up stale oops in StringTable |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2299 StringTable::unlink(&g1_is_alive); |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2175
diff
changeset
|
2300 // Clean up unreferenced symbols in symbol table. |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2175
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|
2301 SymbolTable::unlink(); |
342 | 2302 } |
2303 | |
2304 void ConcurrentMark::swapMarkBitMaps() { | |
2305 CMBitMapRO* temp = _prevMarkBitMap; | |
2306 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2307 _nextMarkBitMap = (CMBitMap*) temp; | |
2308 } | |
2309 | |
2310 class CMRemarkTask: public AbstractGangTask { | |
2311 private: | |
2312 ConcurrentMark *_cm; | |
2313 | |
2314 public: | |
2315 void work(int worker_i) { | |
2316 // Since all available tasks are actually started, we should | |
2317 // only proceed if we're supposed to be actived. | |
2318 if ((size_t)worker_i < _cm->active_tasks()) { | |
2319 CMTask* task = _cm->task(worker_i); | |
2320 task->record_start_time(); | |
2321 do { | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2322 task->do_marking_step(1000000000.0 /* something very large */, |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
2323 true /* do_stealing */, |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2324 true /* do_termination */); |
342 | 2325 } while (task->has_aborted() && !_cm->has_overflown()); |
2326 // If we overflow, then we do not want to restart. We instead | |
2327 // want to abort remark and do concurrent marking again. | |
2328 task->record_end_time(); | |
2329 } | |
2330 } | |
2331 | |
2332 CMRemarkTask(ConcurrentMark* cm) : | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
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|
2333 AbstractGangTask("Par Remark"), _cm(cm) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2334 _cm->terminator()->reset_for_reuse(cm->_g1h->workers()->active_workers()); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
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|
2335 } |
342 | 2336 }; |
2337 | |
2338 void ConcurrentMark::checkpointRootsFinalWork() { | |
2339 ResourceMark rm; | |
2340 HandleMark hm; | |
2341 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2342 | |
2343 g1h->ensure_parsability(false); | |
2344 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2345 if (G1CollectedHeap::use_parallel_gc_threads()) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2346 G1CollectedHeap::StrongRootsScope srs(g1h); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2347 // this is remark, so we'll use up all active threads |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2348 int active_workers = g1h->workers()->active_workers(); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2349 if (active_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2350 assert(active_workers > 0, "Should have been set earlier"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2351 active_workers = ParallelGCThreads; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2352 g1h->workers()->set_active_workers(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
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|
2353 } |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2354 set_phase(active_workers, false /* concurrent */); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2355 // Leave _parallel_marking_threads at it's |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2356 // value originally calculated in the ConcurrentMark |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2357 // constructor and pass values of the active workers |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2358 // through the gang in the task. |
342 | 2359 |
2360 CMRemarkTask remarkTask(this); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2361 g1h->set_par_threads(active_workers); |
342 | 2362 g1h->workers()->run_task(&remarkTask); |
2363 g1h->set_par_threads(0); | |
2364 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2365 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2366 // this is remark, so we'll use up all available threads |
2367 int active_workers = 1; | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2368 set_phase(active_workers, false /* concurrent */); |
342 | 2369 |
2370 CMRemarkTask remarkTask(this); | |
2371 // We will start all available threads, even if we decide that the | |
2372 // active_workers will be fewer. The extra ones will just bail out | |
2373 // immediately. | |
2374 remarkTask.work(0); | |
2375 } | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2376 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2377 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2378 |
2379 print_stats(); | |
2380 | |
2381 #if VERIFY_OBJS_PROCESSED | |
2382 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
2383 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
2384 _scan_obj_cl.objs_processed, | |
2385 ThreadLocalObjQueue::objs_enqueued); | |
2386 guarantee(_scan_obj_cl.objs_processed == | |
2387 ThreadLocalObjQueue::objs_enqueued, | |
2388 "Different number of objs processed and enqueued."); | |
2389 } | |
2390 #endif | |
2391 } | |
2392 | |
1044 | 2393 #ifndef PRODUCT |
2394 | |
1388 | 2395 class PrintReachableOopClosure: public OopClosure { |
342 | 2396 private: |
2397 G1CollectedHeap* _g1h; | |
2398 outputStream* _out; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2399 VerifyOption _vo; |
1388 | 2400 bool _all; |
342 | 2401 |
2402 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2403 PrintReachableOopClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2404 VerifyOption vo, |
1388 | 2405 bool all) : |
1044 | 2406 _g1h(G1CollectedHeap::heap()), |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2407 _out(out), _vo(vo), _all(all) { } |
342 | 2408 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2409 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
|
2410 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
|
2411 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2412 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
|
2413 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2414 const char* str = NULL; |
2415 const char* str2 = ""; | |
2416 | |
1388 | 2417 if (obj == NULL) { |
2418 str = ""; | |
2419 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2420 str = " O"; | |
2421 } else { | |
342 | 2422 HeapRegion* hr = _g1h->heap_region_containing(obj); |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2423 guarantee(hr != NULL, "invariant"); |
1044 | 2424 bool over_tams = false; |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2425 bool marked = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2426 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2427 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2428 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2429 over_tams = hr->obj_allocated_since_prev_marking(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2430 marked = _g1h->isMarkedPrev(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2431 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2432 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2433 over_tams = hr->obj_allocated_since_next_marking(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2434 marked = _g1h->isMarkedNext(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2435 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2436 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2437 marked = obj->is_gc_marked(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2438 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2439 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2440 ShouldNotReachHere(); |
1044 | 2441 } |
2442 | |
2443 if (over_tams) { | |
1388 | 2444 str = " >"; |
2445 if (marked) { | |
342 | 2446 str2 = " AND MARKED"; |
1044 | 2447 } |
1388 | 2448 } else if (marked) { |
2449 str = " M"; | |
1044 | 2450 } else { |
1388 | 2451 str = " NOT"; |
1044 | 2452 } |
342 | 2453 } |
2454 | |
1388 | 2455 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2456 p, (void*) obj, str, str2); |
2457 } | |
2458 }; | |
2459 | |
1388 | 2460 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2461 private: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2462 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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|
2463 outputStream* _out; |
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|
2464 VerifyOption _vo; |
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|
2465 bool _all; |
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|
2466 HeapRegion* _hr; |
342 | 2467 |
2468 public: | |
3772
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|
2469 PrintReachableObjectClosure(outputStream* out, |
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|
2470 VerifyOption vo, |
1388 | 2471 bool all, |
2472 HeapRegion* hr) : | |
3772
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|
2473 _g1h(G1CollectedHeap::heap()), |
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2474 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2475 |
2476 void do_object(oop o) { | |
3772
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|
2477 bool over_tams = false; |
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|
2478 bool marked = false; |
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|
2479 |
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|
2480 switch (_vo) { |
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|
2481 case VerifyOption_G1UsePrevMarking: |
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2482 over_tams = _hr->obj_allocated_since_prev_marking(o); |
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2483 marked = _g1h->isMarkedPrev(o); |
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|
2484 break; |
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|
2485 case VerifyOption_G1UseNextMarking: |
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2486 over_tams = _hr->obj_allocated_since_next_marking(o); |
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2487 marked = _g1h->isMarkedNext(o); |
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|
2488 break; |
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|
2489 case VerifyOption_G1UseMarkWord: |
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|
2490 marked = o->is_gc_marked(); |
6747fd0512e0
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|
2491 break; |
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|
2492 default: |
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|
2493 ShouldNotReachHere(); |
1388 | 2494 } |
2495 bool print_it = _all || over_tams || marked; | |
2496 | |
2497 if (print_it) { | |
2498 _out->print_cr(" "PTR_FORMAT"%s", | |
2499 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
3772
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|
2500 PrintReachableOopClosure oopCl(_out, _vo, _all); |
1388 | 2501 o->oop_iterate(&oopCl); |
2502 } | |
342 | 2503 } |
2504 }; | |
2505 | |
1388 | 2506 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2507 private: |
2508 outputStream* _out; | |
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|
2509 VerifyOption _vo; |
1388 | 2510 bool _all; |
342 | 2511 |
2512 public: | |
2513 bool doHeapRegion(HeapRegion* hr) { | |
2514 HeapWord* b = hr->bottom(); | |
2515 HeapWord* e = hr->end(); | |
2516 HeapWord* t = hr->top(); | |
1044 | 2517 HeapWord* p = NULL; |
3772
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|
2518 |
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|
2519 switch (_vo) { |
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|
2520 case VerifyOption_G1UsePrevMarking: |
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|
2521 p = hr->prev_top_at_mark_start(); |
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diff
changeset
|
2522 break; |
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diff
changeset
|
2523 case VerifyOption_G1UseNextMarking: |
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|
2524 p = hr->next_top_at_mark_start(); |
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|
2525 break; |
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diff
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|
2526 case VerifyOption_G1UseMarkWord: |
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changeset
|
2527 // When we are verifying marking using the mark word |
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|
2528 // TAMS has no relevance. |
6747fd0512e0
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diff
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|
2529 assert(p == NULL, "post-condition"); |
6747fd0512e0
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diff
changeset
|
2530 break; |
6747fd0512e0
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diff
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|
2531 default: |
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|
2532 ShouldNotReachHere(); |
1044 | 2533 } |
342 | 2534 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2535 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2536 _out->cr(); |
2537 | |
2538 HeapWord* from = b; | |
2539 HeapWord* to = t; | |
2540 | |
2541 if (to > from) { | |
2542 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2543 _out->cr(); | |
3772
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|
2544 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2545 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2546 _out->cr(); | |
2547 } | |
342 | 2548 |
2549 return false; | |
2550 } | |
2551 | |
3772
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|
2552 PrintReachableRegionClosure(outputStream* out, |
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|
2553 VerifyOption vo, |
1388 | 2554 bool all) : |
3772
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|
2555 _out(out), _vo(vo), _all(all) { } |
342 | 2556 }; |
2557 | |
3772
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|
2558 static const char* verify_option_to_tams(VerifyOption vo) { |
6747fd0512e0
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diff
changeset
|
2559 switch (vo) { |
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diff
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|
2560 case VerifyOption_G1UsePrevMarking: |
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diff
changeset
|
2561 return "PTAMS"; |
6747fd0512e0
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diff
changeset
|
2562 case VerifyOption_G1UseNextMarking: |
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diff
changeset
|
2563 return "NTAMS"; |
6747fd0512e0
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parents:
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diff
changeset
|
2564 default: |
6747fd0512e0
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diff
changeset
|
2565 return "NONE"; |
6747fd0512e0
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diff
changeset
|
2566 } |
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diff
changeset
|
2567 } |
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diff
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|
2568 |
1388 | 2569 void ConcurrentMark::print_reachable(const char* str, |
3772
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diff
changeset
|
2570 VerifyOption vo, |
1388 | 2571 bool all) { |
2572 gclog_or_tty->cr(); | |
2573 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2574 |
2575 if (G1PrintReachableBaseFile == NULL) { | |
2576 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2577 return; | |
2578 } | |
2579 | |
2580 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2581 (JVM_MAXPATHLEN - 1)) { | |
2582 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2583 return; | |
2584 } | |
2585 | |
2586 char file_name[JVM_MAXPATHLEN]; | |
2587 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2588 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2589 | |
2590 fileStream fout(file_name); | |
2591 if (!fout.is_open()) { | |
2592 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2593 return; | |
2594 } | |
2595 | |
2596 outputStream* out = &fout; | |
3772
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diff
changeset
|
2597 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
1044 | 2598 out->cr(); |
2599 | |
1388 | 2600 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2601 out->cr(); |
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|
2602 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2603 _g1h->heap_region_iterate(&rcl); |
1044 | 2604 out->cr(); |
2605 | |
2606 gclog_or_tty->print_cr(" done"); | |
1388 | 2607 gclog_or_tty->flush(); |
342 | 2608 } |
2609 | |
1044 | 2610 #endif // PRODUCT |
2611 | |
342 | 2612 // This note is for drainAllSATBBuffers and the code in between. |
2613 // In the future we could reuse a task to do this work during an | |
2614 // evacuation pause (since now tasks are not active and can be claimed | |
2615 // during an evacuation pause). This was a late change to the code and | |
2616 // is currently not being taken advantage of. | |
2617 | |
2618 class CMGlobalObjectClosure : public ObjectClosure { | |
2619 private: | |
2620 ConcurrentMark* _cm; | |
2621 | |
2622 public: | |
2623 void do_object(oop obj) { | |
2624 _cm->deal_with_reference(obj); | |
2625 } | |
2626 | |
2627 CMGlobalObjectClosure(ConcurrentMark* cm) : _cm(cm) { } | |
2628 }; | |
2629 | |
2630 void ConcurrentMark::deal_with_reference(oop obj) { | |
3771 | 2631 if (verbose_high()) { |
342 | 2632 gclog_or_tty->print_cr("[global] we're dealing with reference "PTR_FORMAT, |
2633 (void*) obj); | |
3771 | 2634 } |
342 | 2635 |
2636 HeapWord* objAddr = (HeapWord*) obj; | |
845
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|
2637 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
342 | 2638 if (_g1h->is_in_g1_reserved(objAddr)) { |
3771 | 2639 assert(obj != NULL, "null check is implicit"); |
2640 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
2641 // Only get the containing region if the object is not marked on the | |
2642 // bitmap (otherwise, it's a waste of time since we won't do | |
2643 // anything with it). | |
2644 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
2645 if (!hr->obj_allocated_since_next_marking(obj)) { | |
2646 if (verbose_high()) { | |
2647 gclog_or_tty->print_cr("[global] "PTR_FORMAT" is not considered " | |
2648 "marked", (void*) obj); | |
2649 } | |
2650 | |
2651 // we need to mark it first | |
2652 if (_nextMarkBitMap->parMark(objAddr)) { | |
2653 // No OrderAccess:store_load() is needed. It is implicit in the | |
2654 // CAS done in parMark(objAddr) above | |
2655 HeapWord* finger = _finger; | |
2656 if (objAddr < finger) { | |
2657 if (verbose_high()) { | |
2658 gclog_or_tty->print_cr("[global] below the global finger " | |
2659 "("PTR_FORMAT"), pushing it", finger); | |
2660 } | |
2661 if (!mark_stack_push(obj)) { | |
2662 if (verbose_low()) { | |
2663 gclog_or_tty->print_cr("[global] global stack overflow during " | |
2664 "deal_with_reference"); | |
2665 } | |
2666 } | |
342 | 2667 } |
2668 } | |
2669 } | |
2670 } | |
2671 } | |
2672 } | |
2673 | |
2674 void ConcurrentMark::drainAllSATBBuffers() { | |
2675 CMGlobalObjectClosure oc(this); | |
2676 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
2677 satb_mq_set.set_closure(&oc); | |
2678 | |
2679 while (satb_mq_set.apply_closure_to_completed_buffer()) { | |
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2680 if (verbose_medium()) { |
342 | 2681 gclog_or_tty->print_cr("[global] processed an SATB buffer"); |
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|
2682 } |
342 | 2683 } |
2684 | |
2685 // no need to check whether we should do this, as this is only | |
2686 // called during an evacuation pause | |
2687 satb_mq_set.iterate_closure_all_threads(); | |
2688 | |
2689 satb_mq_set.set_closure(NULL); | |
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2690 assert(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2691 } |
2692 | |
2693 void ConcurrentMark::markPrev(oop p) { | |
2694 // Note we are overriding the read-only view of the prev map here, via | |
2695 // the cast. | |
2696 ((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*)p); | |
2697 } | |
2698 | |
2699 void ConcurrentMark::clear(oop p) { | |
2700 assert(p != NULL && p->is_oop(), "expected an oop"); | |
2701 HeapWord* addr = (HeapWord*)p; | |
2702 assert(addr >= _nextMarkBitMap->startWord() || | |
2703 addr < _nextMarkBitMap->endWord(), "in a region"); | |
2704 | |
2705 _nextMarkBitMap->clear(addr); | |
2706 } | |
2707 | |
2708 void ConcurrentMark::clearRangeBothMaps(MemRegion mr) { | |
2709 // Note we are overriding the read-only view of the prev map here, via | |
2710 // the cast. | |
2711 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
2712 _nextMarkBitMap->clearRange(mr); | |
2713 } | |
2714 | |
2715 HeapRegion* | |
2716 ConcurrentMark::claim_region(int task_num) { | |
2717 // "checkpoint" the finger | |
2718 HeapWord* finger = _finger; | |
2719 | |
2720 // _heap_end will not change underneath our feet; it only changes at | |
2721 // yield points. | |
2722 while (finger < _heap_end) { | |
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2723 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2724 |
3771 | 2725 // Note on how this code handles humongous regions. In the |
2726 // normal case the finger will reach the start of a "starts | |
2727 // humongous" (SH) region. Its end will either be the end of the | |
2728 // last "continues humongous" (CH) region in the sequence, or the | |
2729 // standard end of the SH region (if the SH is the only region in | |
2730 // the sequence). That way claim_region() will skip over the CH | |
2731 // regions. However, there is a subtle race between a CM thread | |
2732 // executing this method and a mutator thread doing a humongous | |
2733 // object allocation. The two are not mutually exclusive as the CM | |
2734 // thread does not need to hold the Heap_lock when it gets | |
2735 // here. So there is a chance that claim_region() will come across | |
2736 // a free region that's in the progress of becoming a SH or a CH | |
2737 // region. In the former case, it will either | |
2738 // a) Miss the update to the region's end, in which case it will | |
2739 // visit every subsequent CH region, will find their bitmaps | |
2740 // empty, and do nothing, or | |
2741 // b) Will observe the update of the region's end (in which case | |
2742 // it will skip the subsequent CH regions). | |
2743 // If it comes across a region that suddenly becomes CH, the | |
2744 // scenario will be similar to b). So, the race between | |
2745 // claim_region() and a humongous object allocation might force us | |
2746 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2747 // iterations) but it should not introduce and correctness issues. | |
2748 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2749 HeapWord* bottom = curr_region->bottom(); |
2750 HeapWord* end = curr_region->end(); | |
2751 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2752 | |
3771 | 2753 if (verbose_low()) { |
342 | 2754 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
2755 "["PTR_FORMAT", "PTR_FORMAT"), " | |
2756 "limit = "PTR_FORMAT, | |
2757 task_num, curr_region, bottom, end, limit); | |
3771 | 2758 } |
2759 | |
2760 // Is the gap between reading the finger and doing the CAS too long? | |
2761 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2762 if (res == finger) { |
2763 // we succeeded | |
2764 | |
2765 // notice that _finger == end cannot be guaranteed here since, | |
2766 // someone else might have moved the finger even further | |
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2767 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2768 |
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2769 if (verbose_low()) { |
342 | 2770 gclog_or_tty->print_cr("[%d] we were successful with region = " |
2771 PTR_FORMAT, task_num, curr_region); | |
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|
2772 } |
342 | 2773 |
2774 if (limit > bottom) { | |
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2775 if (verbose_low()) { |
342 | 2776 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
2777 "returning it ", task_num, curr_region); | |
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|
2778 } |
342 | 2779 return curr_region; |
2780 } else { | |
1023
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|
2781 assert(limit == bottom, |
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|
2782 "the region limit should be at bottom"); |
3776
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|
2783 if (verbose_low()) { |
342 | 2784 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
2785 "returning NULL", task_num, curr_region); | |
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|
2786 } |
342 | 2787 // we return NULL and the caller should try calling |
2788 // claim_region() again. | |
2789 return NULL; | |
2790 } | |
2791 } else { | |
1023
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2792 assert(_finger > finger, "the finger should have moved forward"); |
3776
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|
2793 if (verbose_low()) { |
342 | 2794 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
2795 "global finger = "PTR_FORMAT", " | |
2796 "our finger = "PTR_FORMAT, | |
2797 task_num, _finger, finger); | |
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|
2798 } |
342 | 2799 |
2800 // read it again | |
2801 finger = _finger; | |
2802 } | |
2803 } | |
2804 | |
2805 return NULL; | |
2806 } | |
2807 | |
1835
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|
2808 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
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2809 bool result = false; |
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|
2810 for (int i = 0; i < (int)_max_task_num; ++i) { |
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|
2811 CMTask* the_task = _tasks[i]; |
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2812 MemRegion mr = the_task->aborted_region(); |
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|
2813 if (mr.start() != NULL) { |
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|
2814 assert(mr.end() != NULL, "invariant"); |
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|
2815 assert(mr.word_size() > 0, "invariant"); |
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|
2816 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
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2817 assert(hr != NULL, "invariant"); |
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2818 if (hr->in_collection_set()) { |
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2819 // The region points into the collection set |
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2820 the_task->set_aborted_region(MemRegion()); |
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|
2821 result = true; |
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|
2822 } |
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|
2823 } |
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|
2824 } |
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|
2825 return result; |
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|
2826 } |
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|
2827 |
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|
2828 bool ConcurrentMark::has_aborted_regions() { |
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2829 for (int i = 0; i < (int)_max_task_num; ++i) { |
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2830 CMTask* the_task = _tasks[i]; |
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2831 MemRegion mr = the_task->aborted_region(); |
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|
2832 if (mr.start() != NULL) { |
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|
2833 assert(mr.end() != NULL, "invariant"); |
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|
2834 assert(mr.word_size() > 0, "invariant"); |
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|
2835 return true; |
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|
2836 } |
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|
2837 } |
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|
2838 return false; |
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|
2839 } |
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|
2840 |
342 | 2841 void ConcurrentMark::oops_do(OopClosure* cl) { |
3776
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|
2842 if (_markStack.size() > 0 && verbose_low()) { |
342 | 2843 gclog_or_tty->print_cr("[global] scanning the global marking stack, " |
2844 "size = %d", _markStack.size()); | |
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|
2845 } |
342 | 2846 // we first iterate over the contents of the mark stack... |
2847 _markStack.oops_do(cl); | |
2848 | |
2849 for (int i = 0; i < (int)_max_task_num; ++i) { | |
2850 OopTaskQueue* queue = _task_queues->queue((int)i); | |
2851 | |
3776
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|
2852 if (queue->size() > 0 && verbose_low()) { |
342 | 2853 gclog_or_tty->print_cr("[global] scanning task queue of task %d, " |
2854 "size = %d", i, queue->size()); | |
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|
2855 } |
342 | 2856 |
2857 // ...then over the contents of the all the task queues. | |
2858 queue->oops_do(cl); | |
2859 } | |
2860 | |
1835
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|
2861 // Invalidate any entries, that are in the region stack, that |
342 | 2862 // point into the collection set |
2863 if (_regionStack.invalidate_entries_into_cset()) { | |
2864 // otherwise, any gray objects copied during the evacuation pause | |
2865 // might not be visited. | |
1023
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|
2866 assert(_should_gray_objects, "invariant"); |
342 | 2867 } |
1835
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|
2868 |
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|
2869 // Invalidate any aborted regions, recorded in the individual CM |
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|
2870 // tasks, that point into the collection set. |
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|
2871 if (invalidate_aborted_regions_in_cset()) { |
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|
2872 // otherwise, any gray objects copied during the evacuation pause |
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|
2873 // might not be visited. |
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|
2874 assert(_should_gray_objects, "invariant"); |
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|
2875 } |
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|
2876 |
342 | 2877 } |
2878 | |
3316
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changeset
|
2879 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
342 | 2880 _markStack.setEmpty(); |
2881 _markStack.clear_overflow(); | |
2882 _regionStack.setEmpty(); | |
2883 _regionStack.clear_overflow(); | |
3316
cd8e33b2a8ad
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|
2884 if (clear_overflow) { |
cd8e33b2a8ad
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|
2885 clear_has_overflown(); |
cd8e33b2a8ad
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|
2886 } else { |
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|
2887 assert(has_overflown(), "pre-condition"); |
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|
2888 } |
342 | 2889 _finger = _heap_start; |
2890 | |
2891 for (int i = 0; i < (int)_max_task_num; ++i) { | |
2892 OopTaskQueue* queue = _task_queues->queue(i); | |
2893 queue->set_empty(); | |
1885
a5c514e74487
6988458: G1: assert(mr.end() <= _cm->finger()) failed: otherwise the region shouldn't be on the stack
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diff
changeset
|
2894 // Clear any partial regions from the CMTasks |
a5c514e74487
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changeset
|
2895 _tasks[i]->clear_aborted_region(); |
342 | 2896 } |
2897 } | |
2898 | |
2899 void ConcurrentMark::print_stats() { | |
2900 if (verbose_stats()) { | |
2901 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
2902 for (size_t i = 0; i < _active_tasks; ++i) { | |
2903 _tasks[i]->print_stats(); | |
2904 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
2905 } | |
2906 } | |
2907 } | |
2908 | |
2909 class CSMarkOopClosure: public OopClosure { | |
2910 friend class CSMarkBitMapClosure; | |
2911 | |
2912 G1CollectedHeap* _g1h; | |
2913 CMBitMap* _bm; | |
2914 ConcurrentMark* _cm; | |
2915 oop* _ms; | |
2916 jint* _array_ind_stack; | |
2917 int _ms_size; | |
2918 int _ms_ind; | |
2919 int _array_increment; | |
2920 | |
2921 bool push(oop obj, int arr_ind = 0) { | |
2922 if (_ms_ind == _ms_size) { | |
2923 gclog_or_tty->print_cr("Mark stack is full."); | |
2924 return false; | |
2925 } | |
2926 _ms[_ms_ind] = obj; | |
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|
2927 if (obj->is_objArray()) { |
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|
2928 _array_ind_stack[_ms_ind] = arr_ind; |
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|
2929 } |
342 | 2930 _ms_ind++; |
2931 return true; | |
2932 } | |
2933 | |
2934 oop pop() { | |
3776
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|
2935 if (_ms_ind == 0) { |
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|
2936 return NULL; |
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|
2937 } else { |
342 | 2938 _ms_ind--; |
2939 return _ms[_ms_ind]; | |
2940 } | |
2941 } | |
2942 | |
845
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2943 template <class T> bool drain() { |
342 | 2944 while (_ms_ind > 0) { |
2945 oop obj = pop(); | |
2946 assert(obj != NULL, "Since index was non-zero."); | |
2947 if (obj->is_objArray()) { | |
2948 jint arr_ind = _array_ind_stack[_ms_ind]; | |
2949 objArrayOop aobj = objArrayOop(obj); | |
2950 jint len = aobj->length(); | |
2951 jint next_arr_ind = arr_ind + _array_increment; | |
2952 if (next_arr_ind < len) { | |
2953 push(obj, next_arr_ind); | |
2954 } | |
2955 // Now process this portion of this one. | |
2956 int lim = MIN2(next_arr_ind, len); | |
2957 for (int j = arr_ind; j < lim; j++) { | |
912
308762b2bf14
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|
2958 do_oop(aobj->objArrayOopDesc::obj_at_addr<T>(j)); |
342 | 2959 } |
2960 | |
2961 } else { | |
2962 obj->oop_iterate(this); | |
2963 } | |
2964 if (abort()) return false; | |
2965 } | |
2966 return true; | |
2967 } | |
2968 | |
2969 public: | |
2970 CSMarkOopClosure(ConcurrentMark* cm, int ms_size) : | |
2971 _g1h(G1CollectedHeap::heap()), | |
2972 _cm(cm), | |
2973 _bm(cm->nextMarkBitMap()), | |
2974 _ms_size(ms_size), _ms_ind(0), | |
2975 _ms(NEW_C_HEAP_ARRAY(oop, ms_size)), | |
2976 _array_ind_stack(NEW_C_HEAP_ARRAY(jint, ms_size)), | |
2977 _array_increment(MAX2(ms_size/8, 16)) | |
2978 {} | |
2979 | |
2980 ~CSMarkOopClosure() { | |
2981 FREE_C_HEAP_ARRAY(oop, _ms); | |
2982 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
2983 } | |
2984 | |
845
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2985 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2986 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2987 |
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|
2988 template <class T> void do_oop_work(T* p) { |
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|
2989 T heap_oop = oopDesc::load_heap_oop(p); |
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|
2990 if (oopDesc::is_null(heap_oop)) return; |
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2991 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
342 | 2992 if (obj->is_forwarded()) { |
2993 // If the object has already been forwarded, we have to make sure | |
2994 // that it's marked. So follow the forwarding pointer. Note that | |
2995 // this does the right thing for self-forwarding pointers in the | |
2996 // evacuation failure case. | |
2997 obj = obj->forwardee(); | |
2998 } | |
2999 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
3000 if (hr != NULL) { | |
3001 if (hr->in_collection_set()) { | |
3002 if (_g1h->is_obj_ill(obj)) { | |
3003 _bm->mark((HeapWord*)obj); | |
3004 if (!push(obj)) { | |
3005 gclog_or_tty->print_cr("Setting abort in CSMarkOopClosure because push failed."); | |
3006 set_abort(); | |
3007 } | |
3008 } | |
3009 } else { | |
3010 // Outside the collection set; we need to gray it | |
3011 _cm->deal_with_reference(obj); | |
3012 } | |
3013 } | |
3014 } | |
3015 }; | |
3016 | |
3017 class CSMarkBitMapClosure: public BitMapClosure { | |
3018 G1CollectedHeap* _g1h; | |
3019 CMBitMap* _bitMap; | |
3020 ConcurrentMark* _cm; | |
3021 CSMarkOopClosure _oop_cl; | |
3022 public: | |
3023 CSMarkBitMapClosure(ConcurrentMark* cm, int ms_size) : | |
3024 _g1h(G1CollectedHeap::heap()), | |
3025 _bitMap(cm->nextMarkBitMap()), | |
3026 _oop_cl(cm, ms_size) | |
3027 {} | |
3028 | |
3029 ~CSMarkBitMapClosure() {} | |
3030 | |
3031 bool do_bit(size_t offset) { | |
3032 // convert offset into a HeapWord* | |
3033 HeapWord* addr = _bitMap->offsetToHeapWord(offset); | |
3034 assert(_bitMap->endWord() && addr < _bitMap->endWord(), | |
3035 "address out of range"); | |
3036 assert(_bitMap->isMarked(addr), "tautology"); | |
3037 oop obj = oop(addr); | |
3038 if (!obj->is_forwarded()) { | |
3039 if (!_oop_cl.push(obj)) return false; | |
845
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|
3040 if (UseCompressedOops) { |
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|
3041 if (!_oop_cl.drain<narrowOop>()) return false; |
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|
3042 } else { |
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3043 if (!_oop_cl.drain<oop>()) return false; |
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3044 } |
342 | 3045 } |
3046 // Otherwise... | |
3047 return true; | |
3048 } | |
3049 }; | |
3050 | |
3051 | |
3052 class CompleteMarkingInCSHRClosure: public HeapRegionClosure { | |
3053 CMBitMap* _bm; | |
3054 CSMarkBitMapClosure _bit_cl; | |
3055 enum SomePrivateConstants { | |
3056 MSSize = 1000 | |
3057 }; | |
3058 bool _completed; | |
3059 public: | |
3060 CompleteMarkingInCSHRClosure(ConcurrentMark* cm) : | |
3061 _bm(cm->nextMarkBitMap()), | |
3062 _bit_cl(cm, MSSize), | |
3063 _completed(true) | |
3064 {} | |
3065 | |
3066 ~CompleteMarkingInCSHRClosure() {} | |
3067 | |
3068 bool doHeapRegion(HeapRegion* r) { | |
3069 if (!r->evacuation_failed()) { | |
3070 MemRegion mr = MemRegion(r->bottom(), r->next_top_at_mark_start()); | |
3071 if (!mr.is_empty()) { | |
3072 if (!_bm->iterate(&_bit_cl, mr)) { | |
3073 _completed = false; | |
3074 return true; | |
3075 } | |
3076 } | |
3077 } | |
3078 return false; | |
3079 } | |
3080 | |
3081 bool completed() { return _completed; } | |
3082 }; | |
3083 | |
3084 class ClearMarksInHRClosure: public HeapRegionClosure { | |
3085 CMBitMap* _bm; | |
3086 public: | |
3087 ClearMarksInHRClosure(CMBitMap* bm): _bm(bm) { } | |
3088 | |
3089 bool doHeapRegion(HeapRegion* r) { | |
3090 if (!r->used_region().is_empty() && !r->evacuation_failed()) { | |
3091 MemRegion usedMR = r->used_region(); | |
3092 _bm->clearRange(r->used_region()); | |
3093 } | |
3094 return false; | |
3095 } | |
3096 }; | |
3097 | |
3098 void ConcurrentMark::complete_marking_in_collection_set() { | |
3099 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
3100 | |
3101 if (!g1h->mark_in_progress()) { | |
3102 g1h->g1_policy()->record_mark_closure_time(0.0); | |
3103 return; | |
3104 } | |
3105 | |
3106 int i = 1; | |
3107 double start = os::elapsedTime(); | |
3108 while (true) { | |
3109 i++; | |
3110 CompleteMarkingInCSHRClosure cmplt(this); | |
3111 g1h->collection_set_iterate(&cmplt); | |
3112 if (cmplt.completed()) break; | |
3113 } | |
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3114 |
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3115 ClearMarksInHRClosure clr(nextMarkBitMap()); |
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3116 g1h->collection_set_iterate(&clr); |
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3117 |
342 | 3118 double end_time = os::elapsedTime(); |
3119 double elapsed_time_ms = (end_time - start) * 1000.0; | |
3120 g1h->g1_policy()->record_mark_closure_time(elapsed_time_ms); | |
3121 } | |
3122 | |
3123 // The next two methods deal with the following optimisation. Some | |
3124 // objects are gray by being marked and located above the finger. If | |
3125 // they are copied, during an evacuation pause, below the finger then | |
3126 // the need to be pushed on the stack. The observation is that, if | |
3127 // there are no regions in the collection set located above the | |
3128 // finger, then the above cannot happen, hence we do not need to | |
3129 // explicitly gray any objects when copying them to below the | |
3130 // finger. The global stack will be scanned to ensure that, if it | |
3131 // points to objects being copied, it will update their | |
3132 // location. There is a tricky situation with the gray objects in | |
3133 // region stack that are being coped, however. See the comment in | |
3134 // newCSet(). | |
3135 | |
3136 void ConcurrentMark::newCSet() { | |
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3137 if (!concurrent_marking_in_progress()) { |
342 | 3138 // nothing to do if marking is not in progress |
3139 return; | |
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3140 } |
342 | 3141 |
3142 // find what the lowest finger is among the global and local fingers | |
3143 _min_finger = _finger; | |
3144 for (int i = 0; i < (int)_max_task_num; ++i) { | |
3145 CMTask* task = _tasks[i]; | |
3146 HeapWord* task_finger = task->finger(); | |
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3147 if (task_finger != NULL && task_finger < _min_finger) { |
342 | 3148 _min_finger = task_finger; |
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3149 } |
342 | 3150 } |
3151 | |
3152 _should_gray_objects = false; | |
3153 | |
3154 // This fixes a very subtle and fustrating bug. It might be the case | |
3155 // that, during en evacuation pause, heap regions that contain | |
3156 // objects that are gray (by being in regions contained in the | |
3157 // region stack) are included in the collection set. Since such gray | |
3158 // objects will be moved, and because it's not easy to redirect | |
3159 // region stack entries to point to a new location (because objects | |
3160 // in one region might be scattered to multiple regions after they | |
3161 // are copied), one option is to ensure that all marked objects | |
3162 // copied during a pause are pushed on the stack. Notice, however, | |
3163 // that this problem can only happen when the region stack is not | |
3164 // empty during an evacuation pause. So, we make the fix a bit less | |
3165 // conservative and ensure that regions are pushed on the stack, | |
3166 // irrespective whether all collection set regions are below the | |
3167 // finger, if the region stack is not empty. This is expected to be | |
3168 // a rare case, so I don't think it's necessary to be smarted about it. | |
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3169 if (!region_stack_empty() || has_aborted_regions()) { |
342 | 3170 _should_gray_objects = true; |
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3171 } |
342 | 3172 } |
3173 | |
3174 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
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3175 if (!concurrent_marking_in_progress()) return; |
342 | 3176 |
3177 HeapWord* region_end = hr->end(); | |
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3178 if (region_end > _min_finger) { |
342 | 3179 _should_gray_objects = true; |
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3180 } |
342 | 3181 } |
3182 | |
3378
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3183 // Resets the region fields of active CMTasks whose values point |
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3184 // into the collection set. |
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3185 void ConcurrentMark::reset_active_task_region_fields_in_cset() { |
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3186 assert(SafepointSynchronize::is_at_safepoint(), "should be in STW"); |
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3187 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
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3188 |
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3189 for (int i = 0; i < (int)parallel_marking_threads(); i += 1) { |
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3190 CMTask* task = _tasks[i]; |
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3191 HeapWord* task_finger = task->finger(); |
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3192 if (task_finger != NULL) { |
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3193 assert(_g1h->is_in_g1_reserved(task_finger), "not in heap"); |
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3194 HeapRegion* finger_region = _g1h->heap_region_containing(task_finger); |
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3195 if (finger_region->in_collection_set()) { |
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3196 // The task's current region is in the collection set. |
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3197 // This region will be evacuated in the current GC and |
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3198 // the region fields in the task will be stale. |
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3199 task->giveup_current_region(); |
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3200 } |
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3201 } |
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3202 } |
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3203 } |
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3204 |
342 | 3205 // abandon current marking iteration due to a Full GC |
3206 void ConcurrentMark::abort() { | |
3207 // Clear all marks to force marking thread to do nothing | |
3208 _nextMarkBitMap->clearAll(); | |
3209 // Empty mark stack | |
3210 clear_marking_state(); | |
1835
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3211 for (int i = 0; i < (int)_max_task_num; ++i) { |
342 | 3212 _tasks[i]->clear_region_fields(); |
1835
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3213 } |
342 | 3214 _has_aborted = true; |
3215 | |
3216 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3217 satb_mq_set.abandon_partial_marking(); | |
1317
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3218 // This can be called either during or outside marking, we'll read |
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3219 // the expected_active value from the SATB queue set. |
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3220 satb_mq_set.set_active_all_threads( |
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3221 false, /* new active value */ |
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3222 satb_mq_set.is_active() /* expected_active */); |
342 | 3223 } |
3224 | |
3225 static void print_ms_time_info(const char* prefix, const char* name, | |
3226 NumberSeq& ns) { | |
3227 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3228 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3229 if (ns.num() > 0) { | |
3230 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3231 prefix, ns.sd(), ns.maximum()); | |
3232 } | |
3233 } | |
3234 | |
3235 void ConcurrentMark::print_summary_info() { | |
3236 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3237 print_ms_time_info(" ", "init marks", _init_times); | |
3238 print_ms_time_info(" ", "remarks", _remark_times); | |
3239 { | |
3240 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3241 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3242 | |
3243 } | |
3244 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3245 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3246 _total_counting_time, | |
3247 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3248 (double)_cleanup_times.num() | |
3249 : 0.0)); | |
3250 if (G1ScrubRemSets) { | |
3251 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3252 _total_rs_scrub_time, | |
3253 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3254 (double)_cleanup_times.num() | |
3255 : 0.0)); | |
3256 } | |
3257 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3258 (_init_times.sum() + _remark_times.sum() + | |
3259 _cleanup_times.sum())/1000.0); | |
3260 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
3261 "(%8.2f s marking, %8.2f s counting).", | |
3262 cmThread()->vtime_accum(), | |
3263 cmThread()->vtime_mark_accum(), | |
3264 cmThread()->vtime_count_accum()); | |
3265 } | |
3266 | |
1019 | 3267 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
3268 _parallel_workers->print_worker_threads_on(st); | |
3269 } | |
3270 | |
342 | 3271 // Closures |
3272 // XXX: there seems to be a lot of code duplication here; | |
3273 // should refactor and consolidate the shared code. | |
3274 | |
3275 // This closure is used to mark refs into the CMS generation in | |
3276 // the CMS bit map. Called at the first checkpoint. | |
3277 | |
3278 // We take a break if someone is trying to stop the world. | |
3279 bool ConcurrentMark::do_yield_check(int worker_i) { | |
3280 if (should_yield()) { | |
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3281 if (worker_i == 0) { |
342 | 3282 _g1h->g1_policy()->record_concurrent_pause(); |
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3283 } |
342 | 3284 cmThread()->yield(); |
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3285 if (worker_i == 0) { |
342 | 3286 _g1h->g1_policy()->record_concurrent_pause_end(); |
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3287 } |
342 | 3288 return true; |
3289 } else { | |
3290 return false; | |
3291 } | |
3292 } | |
3293 | |
3294 bool ConcurrentMark::should_yield() { | |
3295 return cmThread()->should_yield(); | |
3296 } | |
3297 | |
3298 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3299 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3300 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3301 } | |
3302 | |
3303 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3304 void* last) { | |
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3305 return containing_card_is_marked(start) && |
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3306 containing_card_is_marked(last); |
342 | 3307 } |
3308 | |
3309 #ifndef PRODUCT | |
3310 // for debugging purposes | |
3311 void ConcurrentMark::print_finger() { | |
3312 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3313 _heap_start, _heap_end, _finger); | |
3314 for (int i = 0; i < (int) _max_task_num; ++i) { | |
3315 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
3316 } | |
3317 gclog_or_tty->print_cr(""); | |
3318 } | |
3319 #endif | |
3320 | |
3771 | 3321 void CMTask::scan_object(oop obj) { |
3322 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3323 | |
3324 if (_cm->verbose_high()) { | |
3325 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
3326 _task_id, (void*) obj); | |
3327 } | |
3328 | |
3329 size_t obj_size = obj->size(); | |
3330 _words_scanned += obj_size; | |
3331 | |
3332 obj->oop_iterate(_cm_oop_closure); | |
3333 statsOnly( ++_objs_scanned ); | |
3334 check_limits(); | |
3335 } | |
3336 | |
342 | 3337 // Closure for iteration over bitmaps |
3338 class CMBitMapClosure : public BitMapClosure { | |
3339 private: | |
3340 // the bitmap that is being iterated over | |
3341 CMBitMap* _nextMarkBitMap; | |
3342 ConcurrentMark* _cm; | |
3343 CMTask* _task; | |
3344 // true if we're scanning a heap region claimed by the task (so that | |
3345 // we move the finger along), false if we're not, i.e. currently when | |
3346 // scanning a heap region popped from the region stack (so that we | |
3347 // do not move the task finger along; it'd be a mistake if we did so). | |
3348 bool _scanning_heap_region; | |
3349 | |
3350 public: | |
3351 CMBitMapClosure(CMTask *task, | |
3352 ConcurrentMark* cm, | |
3353 CMBitMap* nextMarkBitMap) | |
3354 : _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } | |
3355 | |
3356 void set_scanning_heap_region(bool scanning_heap_region) { | |
3357 _scanning_heap_region = scanning_heap_region; | |
3358 } | |
3359 | |
3360 bool do_bit(size_t offset) { | |
3361 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3362 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3363 assert( addr < _cm->finger(), "invariant"); |
342 | 3364 |
3365 if (_scanning_heap_region) { | |
3366 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
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3367 assert(addr >= _task->finger(), "invariant"); |
342 | 3368 // We move that task's local finger along. |
3369 _task->move_finger_to(addr); | |
3370 } else { | |
3371 // We move the task's region finger along. | |
3372 _task->move_region_finger_to(addr); | |
3373 } | |
3374 | |
3375 _task->scan_object(oop(addr)); | |
3376 // we only partially drain the local queue and global stack | |
3377 _task->drain_local_queue(true); | |
3378 _task->drain_global_stack(true); | |
3379 | |
3380 // if the has_aborted flag has been raised, we need to bail out of | |
3381 // the iteration | |
3382 return !_task->has_aborted(); | |
3383 } | |
3384 }; | |
3385 | |
3386 // Closure for iterating over objects, currently only used for | |
3387 // processing SATB buffers. | |
3388 class CMObjectClosure : public ObjectClosure { | |
3389 private: | |
3390 CMTask* _task; | |
3391 | |
3392 public: | |
3393 void do_object(oop obj) { | |
3394 _task->deal_with_reference(obj); | |
3395 } | |
3396 | |
3397 CMObjectClosure(CMTask* task) : _task(task) { } | |
3398 }; | |
3399 | |
3771 | 3400 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3401 ConcurrentMark* cm, | |
3402 CMTask* task) | |
3403 : _g1h(g1h), _cm(cm), _task(task) { | |
3404 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3405 | |
3406 if (G1UseConcMarkReferenceProcessing) { | |
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3407 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3408 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3409 } |
3771 | 3410 } |
342 | 3411 |
3412 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3413 // Separated the asserts so that we know which one fires. |
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3414 assert(hr != NULL, |
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3415 "claim_region() should have filtered out continues humongous regions"); |
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3416 assert(!hr->continuesHumongous(), |
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3417 "claim_region() should have filtered out continues humongous regions"); |
342 | 3418 |
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3419 if (_cm->verbose_low()) { |
342 | 3420 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
3421 _task_id, hr); | |
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3422 } |
342 | 3423 |
3424 _curr_region = hr; | |
3425 _finger = hr->bottom(); | |
3426 update_region_limit(); | |
3427 } | |
3428 | |
3429 void CMTask::update_region_limit() { | |
3430 HeapRegion* hr = _curr_region; | |
3431 HeapWord* bottom = hr->bottom(); | |
3432 HeapWord* limit = hr->next_top_at_mark_start(); | |
3433 | |
3434 if (limit == bottom) { | |
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3435 if (_cm->verbose_low()) { |
342 | 3436 gclog_or_tty->print_cr("[%d] found an empty region " |
3437 "["PTR_FORMAT", "PTR_FORMAT")", | |
3438 _task_id, bottom, limit); | |
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3439 } |
342 | 3440 // The region was collected underneath our feet. |
3441 // We set the finger to bottom to ensure that the bitmap | |
3442 // iteration that will follow this will not do anything. | |
3443 // (this is not a condition that holds when we set the region up, | |
3444 // as the region is not supposed to be empty in the first place) | |
3445 _finger = bottom; | |
3446 } else if (limit >= _region_limit) { | |
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3447 assert(limit >= _finger, "peace of mind"); |
342 | 3448 } else { |
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3449 assert(limit < _region_limit, "only way to get here"); |
342 | 3450 // This can happen under some pretty unusual circumstances. An |
3451 // evacuation pause empties the region underneath our feet (NTAMS | |
3452 // at bottom). We then do some allocation in the region (NTAMS | |
3453 // stays at bottom), followed by the region being used as a GC | |
3454 // alloc region (NTAMS will move to top() and the objects | |
3455 // originally below it will be grayed). All objects now marked in | |
3456 // the region are explicitly grayed, if below the global finger, | |
3457 // and we do not need in fact to scan anything else. So, we simply | |
3458 // set _finger to be limit to ensure that the bitmap iteration | |
3459 // doesn't do anything. | |
3460 _finger = limit; | |
3461 } | |
3462 | |
3463 _region_limit = limit; | |
3464 } | |
3465 | |
3466 void CMTask::giveup_current_region() { | |
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3467 assert(_curr_region != NULL, "invariant"); |
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3468 if (_cm->verbose_low()) { |
342 | 3469 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
3470 _task_id, _curr_region); | |
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3471 } |
342 | 3472 clear_region_fields(); |
3473 } | |
3474 | |
3475 void CMTask::clear_region_fields() { | |
3476 // Values for these three fields that indicate that we're not | |
3477 // holding on to a region. | |
3478 _curr_region = NULL; | |
3479 _finger = NULL; | |
3480 _region_limit = NULL; | |
3481 | |
3482 _region_finger = NULL; | |
3483 } | |
3484 | |
3771 | 3485 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3486 if (cm_oop_closure == NULL) { | |
3487 assert(_cm_oop_closure != NULL, "invariant"); | |
3488 } else { | |
3489 assert(_cm_oop_closure == NULL, "invariant"); | |
3490 } | |
3491 _cm_oop_closure = cm_oop_closure; | |
3492 } | |
3493 | |
342 | 3494 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3495 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3496 |
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3497 if (_cm->verbose_low()) { |
342 | 3498 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
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3499 } |
342 | 3500 |
3501 _nextMarkBitMap = nextMarkBitMap; | |
3502 clear_region_fields(); | |
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3503 assert(_aborted_region.is_empty(), "should have been cleared"); |
342 | 3504 |
3505 _calls = 0; | |
3506 _elapsed_time_ms = 0.0; | |
3507 _termination_time_ms = 0.0; | |
3508 _termination_start_time_ms = 0.0; | |
3509 | |
3510 #if _MARKING_STATS_ | |
3511 _local_pushes = 0; | |
3512 _local_pops = 0; | |
3513 _local_max_size = 0; | |
3514 _objs_scanned = 0; | |
3515 _global_pushes = 0; | |
3516 _global_pops = 0; | |
3517 _global_max_size = 0; | |
3518 _global_transfers_to = 0; | |
3519 _global_transfers_from = 0; | |
3520 _region_stack_pops = 0; | |
3521 _regions_claimed = 0; | |
3522 _objs_found_on_bitmap = 0; | |
3523 _satb_buffers_processed = 0; | |
3524 _steal_attempts = 0; | |
3525 _steals = 0; | |
3526 _aborted = 0; | |
3527 _aborted_overflow = 0; | |
3528 _aborted_cm_aborted = 0; | |
3529 _aborted_yield = 0; | |
3530 _aborted_timed_out = 0; | |
3531 _aborted_satb = 0; | |
3532 _aborted_termination = 0; | |
3533 #endif // _MARKING_STATS_ | |
3534 } | |
3535 | |
3536 bool CMTask::should_exit_termination() { | |
3537 regular_clock_call(); | |
3538 // This is called when we are in the termination protocol. We should | |
3539 // quit if, for some reason, this task wants to abort or the global | |
3540 // stack is not empty (this means that we can get work from it). | |
3541 return !_cm->mark_stack_empty() || has_aborted(); | |
3542 } | |
3543 | |
3544 void CMTask::reached_limit() { | |
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3545 assert(_words_scanned >= _words_scanned_limit || |
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3546 _refs_reached >= _refs_reached_limit , |
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3547 "shouldn't have been called otherwise"); |
342 | 3548 regular_clock_call(); |
3549 } | |
3550 | |
3551 void CMTask::regular_clock_call() { | |
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3552 if (has_aborted()) return; |
342 | 3553 |
3554 // First, we need to recalculate the words scanned and refs reached | |
3555 // limits for the next clock call. | |
3556 recalculate_limits(); | |
3557 | |
3558 // During the regular clock call we do the following | |
3559 | |
3560 // (1) If an overflow has been flagged, then we abort. | |
3561 if (_cm->has_overflown()) { | |
3562 set_has_aborted(); | |
3563 return; | |
3564 } | |
3565 | |
3566 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3567 // to check anything else. The other steps are only needed during | |
3568 // the concurrent marking phase. | |
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3569 if (!concurrent()) return; |
342 | 3570 |
3571 // (2) If marking has been aborted for Full GC, then we also abort. | |
3572 if (_cm->has_aborted()) { | |
3573 set_has_aborted(); | |
3574 statsOnly( ++_aborted_cm_aborted ); | |
3575 return; | |
3576 } | |
3577 | |
3578 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3579 | |
3580 // (3) If marking stats are enabled, then we update the step history. | |
3581 #if _MARKING_STATS_ | |
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3582 if (_words_scanned >= _words_scanned_limit) { |
342 | 3583 ++_clock_due_to_scanning; |
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3584 } |
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3585 if (_refs_reached >= _refs_reached_limit) { |
342 | 3586 ++_clock_due_to_marking; |
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3587 } |
342 | 3588 |
3589 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3590 _interval_start_time_ms = curr_time_ms; | |
3591 _all_clock_intervals_ms.add(last_interval_ms); | |
3592 | |
3593 if (_cm->verbose_medium()) { | |
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3594 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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3595 "scanned = %d%s, refs reached = %d%s", |
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3596 _task_id, last_interval_ms, |
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3597 _words_scanned, |
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3598 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3599 _refs_reached, |
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3600 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3601 } |
3602 #endif // _MARKING_STATS_ | |
3603 | |
3604 // (4) We check whether we should yield. If we have to, then we abort. | |
3605 if (_cm->should_yield()) { | |
3606 // We should yield. To do this we abort the task. The caller is | |
3607 // responsible for yielding. | |
3608 set_has_aborted(); | |
3609 statsOnly( ++_aborted_yield ); | |
3610 return; | |
3611 } | |
3612 | |
3613 // (5) We check whether we've reached our time quota. If we have, | |
3614 // then we abort. | |
3615 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3616 if (elapsed_time_ms > _time_target_ms) { | |
3617 set_has_aborted(); | |
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3618 _has_timed_out = true; |
342 | 3619 statsOnly( ++_aborted_timed_out ); |
3620 return; | |
3621 } | |
3622 | |
3623 // (6) Finally, we check whether there are enough completed STAB | |
3624 // buffers available for processing. If there are, we abort. | |
3625 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3626 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3627 if (_cm->verbose_low()) { |
342 | 3628 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
3629 _task_id); | |
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3630 } |
342 | 3631 // we do need to process SATB buffers, we'll abort and restart |
3632 // the marking task to do so | |
3633 set_has_aborted(); | |
3634 statsOnly( ++_aborted_satb ); | |
3635 return; | |
3636 } | |
3637 } | |
3638 | |
3639 void CMTask::recalculate_limits() { | |
3640 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3641 _words_scanned_limit = _real_words_scanned_limit; | |
3642 | |
3643 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3644 _refs_reached_limit = _real_refs_reached_limit; | |
3645 } | |
3646 | |
3647 void CMTask::decrease_limits() { | |
3648 // This is called when we believe that we're going to do an infrequent | |
3649 // operation which will increase the per byte scanned cost (i.e. move | |
3650 // entries to/from the global stack). It basically tries to decrease the | |
3651 // scanning limit so that the clock is called earlier. | |
3652 | |
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3653 if (_cm->verbose_medium()) { |
342 | 3654 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
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3655 } |
342 | 3656 |
3657 _words_scanned_limit = _real_words_scanned_limit - | |
3658 3 * words_scanned_period / 4; | |
3659 _refs_reached_limit = _real_refs_reached_limit - | |
3660 3 * refs_reached_period / 4; | |
3661 } | |
3662 | |
3663 void CMTask::move_entries_to_global_stack() { | |
3664 // local array where we'll store the entries that will be popped | |
3665 // from the local queue | |
3666 oop buffer[global_stack_transfer_size]; | |
3667 | |
3668 int n = 0; | |
3669 oop obj; | |
3670 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3671 buffer[n] = obj; | |
3672 ++n; | |
3673 } | |
3674 | |
3675 if (n > 0) { | |
3676 // we popped at least one entry from the local queue | |
3677 | |
3678 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3679 | |
3680 if (!_cm->mark_stack_push(buffer, n)) { | |
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3681 if (_cm->verbose_low()) { |
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3682 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
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3683 _task_id); |
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3684 } |
342 | 3685 set_has_aborted(); |
3686 } else { | |
3687 // the transfer was successful | |
3688 | |
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3689 if (_cm->verbose_medium()) { |
342 | 3690 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
3691 _task_id, n); | |
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3692 } |
342 | 3693 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3694 if (tmp_size > _global_max_size) { |
342 | 3695 _global_max_size = tmp_size; |
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3696 } |
342 | 3697 _global_pushes += n ); |
3698 } | |
3699 } | |
3700 | |
3701 // this operation was quite expensive, so decrease the limits | |
3702 decrease_limits(); | |
3703 } | |
3704 | |
3705 void CMTask::get_entries_from_global_stack() { | |
3706 // local array where we'll store the entries that will be popped | |
3707 // from the global stack. | |
3708 oop buffer[global_stack_transfer_size]; | |
3709 int n; | |
3710 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3711 assert(n <= global_stack_transfer_size, |
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3712 "we should not pop more than the given limit"); |
342 | 3713 if (n > 0) { |
3714 // yes, we did actually pop at least one entry | |
3715 | |
3716 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3717 if (_cm->verbose_medium()) { |
342 | 3718 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
3719 _task_id, n); | |
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3720 } |
342 | 3721 for (int i = 0; i < n; ++i) { |
3722 bool success = _task_queue->push(buffer[i]); | |
3723 // We only call this when the local queue is empty or under a | |
3724 // given target limit. So, we do not expect this push to fail. | |
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3725 assert(success, "invariant"); |
342 | 3726 } |
3727 | |
3728 statsOnly( int tmp_size = _task_queue->size(); | |
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3729 if (tmp_size > _local_max_size) { |
342 | 3730 _local_max_size = tmp_size; |
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3731 } |
342 | 3732 _local_pushes += n ); |
3733 } | |
3734 | |
3735 // this operation was quite expensive, so decrease the limits | |
3736 decrease_limits(); | |
3737 } | |
3738 | |
3739 void CMTask::drain_local_queue(bool partially) { | |
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3740 if (has_aborted()) return; |
342 | 3741 |
3742 // Decide what the target size is, depending whether we're going to | |
3743 // drain it partially (so that other tasks can steal if they run out | |
3744 // of things to do) or totally (at the very end). | |
3745 size_t target_size; | |
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|
3746 if (partially) { |
342 | 3747 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3748 } else { |
342 | 3749 target_size = 0; |
3776
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3750 } |
342 | 3751 |
3752 if (_task_queue->size() > target_size) { | |
3776
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3753 if (_cm->verbose_high()) { |
342 | 3754 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
3755 _task_id, target_size); | |
3776
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3756 } |
342 | 3757 |
3758 oop obj; | |
3759 bool ret = _task_queue->pop_local(obj); | |
3760 while (ret) { | |
3761 statsOnly( ++_local_pops ); | |
3762 | |
3776
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3763 if (_cm->verbose_high()) { |
342 | 3764 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
3765 (void*) obj); | |
3776
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3766 } |
342 | 3767 |
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3768 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3769 assert(!_g1h->is_on_master_free_list( |
2152 | 3770 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3771 |
3772 scan_object(obj); | |
3773 | |
3776
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3774 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3775 ret = false; |
3776
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3776 } else { |
342 | 3777 ret = _task_queue->pop_local(obj); |
3776
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3778 } |
342 | 3779 } |
3780 | |
3776
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3781 if (_cm->verbose_high()) { |
342 | 3782 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
3783 _task_id, _task_queue->size()); | |
3776
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3784 } |
342 | 3785 } |
3786 } | |
3787 | |
3788 void CMTask::drain_global_stack(bool partially) { | |
3776
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|
3789 if (has_aborted()) return; |
342 | 3790 |
3791 // We have a policy to drain the local queue before we attempt to | |
3792 // drain the global stack. | |
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3793 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3794 |
3795 // Decide what the target size is, depending whether we're going to | |
3796 // drain it partially (so that other tasks can steal if they run out | |
3797 // of things to do) or totally (at the very end). Notice that, | |
3798 // because we move entries from the global stack in chunks or | |
3799 // because another task might be doing the same, we might in fact | |
3800 // drop below the target. But, this is not a problem. | |
3801 size_t target_size; | |
3776
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|
3802 if (partially) { |
342 | 3803 target_size = _cm->partial_mark_stack_size_target(); |
3776
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3804 } else { |
342 | 3805 target_size = 0; |
3776
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3806 } |
342 | 3807 |
3808 if (_cm->mark_stack_size() > target_size) { | |
3776
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3809 if (_cm->verbose_low()) { |
342 | 3810 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
3811 _task_id, target_size); | |
3776
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3812 } |
342 | 3813 |
3814 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3815 get_entries_from_global_stack(); | |
3816 drain_local_queue(partially); | |
3817 } | |
3818 | |
3776
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3819 if (_cm->verbose_low()) { |
342 | 3820 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
3821 _task_id, _cm->mark_stack_size()); | |
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3822 } |
342 | 3823 } |
3824 } | |
3825 | |
3826 // SATB Queue has several assumptions on whether to call the par or | |
3827 // non-par versions of the methods. this is why some of the code is | |
3828 // replicated. We should really get rid of the single-threaded version | |
3829 // of the code to simplify things. | |
3830 void CMTask::drain_satb_buffers() { | |
3776
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3831 if (has_aborted()) return; |
342 | 3832 |
3833 // We set this so that the regular clock knows that we're in the | |
3834 // middle of draining buffers and doesn't set the abort flag when it | |
3835 // notices that SATB buffers are available for draining. It'd be | |
3836 // very counter productive if it did that. :-) | |
3837 _draining_satb_buffers = true; | |
3838 | |
3839 CMObjectClosure oc(this); | |
3840 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3776
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|
3841 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3842 satb_mq_set.set_par_closure(_task_id, &oc); |
3776
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3843 } else { |
342 | 3844 satb_mq_set.set_closure(&oc); |
3776
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|
3845 } |
342 | 3846 |
3847 // This keeps claiming and applying the closure to completed buffers | |
3848 // until we run out of buffers or we need to abort. | |
1833
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6984287: Regularize how GC parallel workers are specified.
jmasa
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3849 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3850 while (!has_aborted() && |
3851 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
3776
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|
3852 if (_cm->verbose_medium()) { |
342 | 3853 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
3776
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3854 } |
342 | 3855 statsOnly( ++_satb_buffers_processed ); |
3856 regular_clock_call(); | |
3857 } | |
3858 } else { | |
3859 while (!has_aborted() && | |
3860 satb_mq_set.apply_closure_to_completed_buffer()) { | |
3776
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|
3861 if (_cm->verbose_medium()) { |
342 | 3862 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
3776
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|
3863 } |
342 | 3864 statsOnly( ++_satb_buffers_processed ); |
3865 regular_clock_call(); | |
3866 } | |
3867 } | |
3868 | |
3869 if (!concurrent() && !has_aborted()) { | |
3870 // We should only do this during remark. | |
3776
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|
3871 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3872 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
3776
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|
3873 } else { |
342 | 3874 satb_mq_set.iterate_closure_all_threads(); |
3776
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|
3875 } |
342 | 3876 } |
3877 | |
3878 _draining_satb_buffers = false; | |
3879 | |
1023
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|
3880 assert(has_aborted() || |
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|
3881 concurrent() || |
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|
3882 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3883 |
3776
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|
3884 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3885 satb_mq_set.set_par_closure(_task_id, NULL); |
3776
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|
3886 } else { |
342 | 3887 satb_mq_set.set_closure(NULL); |
3776
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|
3888 } |
342 | 3889 |
3890 // again, this was a potentially expensive operation, decrease the | |
3891 // limits to get the regular clock call early | |
3892 decrease_limits(); | |
3893 } | |
3894 | |
3895 void CMTask::drain_region_stack(BitMapClosure* bc) { | |
3776
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|
3896 if (has_aborted()) return; |
342 | 3897 |
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|
3898 assert(_region_finger == NULL, |
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|
3899 "it should be NULL when we're not scanning a region"); |
342 | 3900 |
1835
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|
3901 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
3776
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|
3902 if (_cm->verbose_low()) { |
342 | 3903 gclog_or_tty->print_cr("[%d] draining region stack, size = %d", |
3904 _task_id, _cm->region_stack_size()); | |
3776
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|
3905 } |
342 | 3906 |
1835
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johnc
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|
3907 MemRegion mr; |
4805b9f4779e
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|
3908 |
4805b9f4779e
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|
3909 if (!_aborted_region.is_empty()) { |
4805b9f4779e
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|
3910 mr = _aborted_region; |
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|
3911 _aborted_region = MemRegion(); |
4805b9f4779e
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|
3912 |
3776
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changeset
|
3913 if (_cm->verbose_low()) { |
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|
3914 gclog_or_tty->print_cr("[%d] scanning aborted region " |
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|
3915 "[ " PTR_FORMAT ", " PTR_FORMAT " )", |
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|
3916 _task_id, mr.start(), mr.end()); |
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|
3917 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
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diff
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|
3918 } else { |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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diff
changeset
|
3919 mr = _cm->region_stack_pop_lock_free(); |
4805b9f4779e
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|
3920 // it returns MemRegion() if the pop fails |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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diff
changeset
|
3921 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
4805b9f4779e
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|
3922 } |
342 | 3923 |
3924 while (mr.start() != NULL) { | |
3776
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|
3925 if (_cm->verbose_medium()) { |
342 | 3926 gclog_or_tty->print_cr("[%d] we are scanning region " |
3927 "["PTR_FORMAT", "PTR_FORMAT")", | |
3928 _task_id, mr.start(), mr.end()); | |
3776
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|
3929 } |
1835
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|
3930 |
1023
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|
3931 assert(mr.end() <= _cm->finger(), |
11d4857fe5e1
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diff
changeset
|
3932 "otherwise the region shouldn't be on the stack"); |
342 | 3933 assert(!mr.is_empty(), "Only non-empty regions live on the region stack"); |
3934 if (_nextMarkBitMap->iterate(bc, mr)) { | |
1023
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|
3935 assert(!has_aborted(), |
11d4857fe5e1
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diff
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|
3936 "cannot abort the task without aborting the bitmap iteration"); |
342 | 3937 |
3938 // We finished iterating over the region without aborting. | |
3939 regular_clock_call(); | |
3776
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|
3940 if (has_aborted()) { |
342 | 3941 mr = MemRegion(); |
3776
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|
3942 } else { |
1835
4805b9f4779e
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diff
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|
3943 mr = _cm->region_stack_pop_lock_free(); |
342 | 3944 // it returns MemRegion() if the pop fails |
3945 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); | |
3946 } | |
3947 } else { | |
1023
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|
3948 assert(has_aborted(), "currently the only way to do so"); |
342 | 3949 |
3950 // The only way to abort the bitmap iteration is to return | |
3951 // false from the do_bit() method. However, inside the | |
3952 // do_bit() method we move the _region_finger to point to the | |
3953 // object currently being looked at. So, if we bail out, we | |
3954 // have definitely set _region_finger to something non-null. | |
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|
3955 assert(_region_finger != NULL, "invariant"); |
342 | 3956 |
1835
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diff
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|
3957 // Make sure that any previously aborted region has been |
4805b9f4779e
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diff
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|
3958 // cleared. |
4805b9f4779e
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diff
changeset
|
3959 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
4805b9f4779e
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|
3960 |
342 | 3961 // The iteration was actually aborted. So now _region_finger |
3962 // points to the address of the object we last scanned. If we | |
3963 // leave it there, when we restart this task, we will rescan | |
3964 // the object. It is easy to avoid this. We move the finger by | |
3965 // enough to point to the next possible object header (the | |
3966 // bitmap knows by how much we need to move it as it knows its | |
3967 // granularity). | |
3968 MemRegion newRegion = | |
3969 MemRegion(_nextMarkBitMap->nextWord(_region_finger), mr.end()); | |
3970 | |
3971 if (!newRegion.is_empty()) { | |
3972 if (_cm->verbose_low()) { | |
1835
4805b9f4779e
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1833
diff
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|
3973 gclog_or_tty->print_cr("[%d] recording unscanned region" |
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diff
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|
3974 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
342 | 3975 _task_id, |
3976 newRegion.start(), newRegion.end()); | |
3977 } | |
1835
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johnc
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diff
changeset
|
3978 // Now record the part of the region we didn't scan to |
4805b9f4779e
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changeset
|
3979 // make sure this task scans it later. |
4805b9f4779e
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|
3980 _aborted_region = newRegion; |
342 | 3981 } |
3982 // break from while | |
3983 mr = MemRegion(); | |
3984 } | |
3985 _region_finger = NULL; | |
3986 } | |
3987 | |
3776
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|
3988 if (_cm->verbose_low()) { |
342 | 3989 gclog_or_tty->print_cr("[%d] drained region stack, size = %d", |
3990 _task_id, _cm->region_stack_size()); | |
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|
3991 } |
342 | 3992 } |
3993 } | |
3994 | |
3995 void CMTask::print_stats() { | |
3996 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
3997 _task_id, _calls); | |
3998 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
3999 _elapsed_time_ms, _termination_time_ms); | |
4000 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4001 _step_times_ms.num(), _step_times_ms.avg(), | |
4002 _step_times_ms.sd()); | |
4003 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4004 _step_times_ms.maximum(), _step_times_ms.sum()); | |
4005 | |
4006 #if _MARKING_STATS_ | |
4007 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4008 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
4009 _all_clock_intervals_ms.sd()); | |
4010 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4011 _all_clock_intervals_ms.maximum(), | |
4012 _all_clock_intervals_ms.sum()); | |
4013 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
4014 _clock_due_to_scanning, _clock_due_to_marking); | |
4015 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
4016 _objs_scanned, _objs_found_on_bitmap); | |
4017 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
4018 _local_pushes, _local_pops, _local_max_size); | |
4019 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
4020 _global_pushes, _global_pops, _global_max_size); | |
4021 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
4022 _global_transfers_to,_global_transfers_from); | |
4023 gclog_or_tty->print_cr(" Regions: claimed = %d, Region Stack: pops = %d", | |
4024 _regions_claimed, _region_stack_pops); | |
4025 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); | |
4026 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
4027 _steal_attempts, _steals); | |
4028 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
4029 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
4030 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
4031 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
4032 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
4033 #endif // _MARKING_STATS_ | |
4034 } | |
4035 | |
4036 /***************************************************************************** | |
4037 | |
4038 The do_marking_step(time_target_ms) method is the building block | |
4039 of the parallel marking framework. It can be called in parallel | |
4040 with other invocations of do_marking_step() on different tasks | |
4041 (but only one per task, obviously) and concurrently with the | |
4042 mutator threads, or during remark, hence it eliminates the need | |
4043 for two versions of the code. When called during remark, it will | |
4044 pick up from where the task left off during the concurrent marking | |
4045 phase. Interestingly, tasks are also claimable during evacuation | |
4046 pauses too, since do_marking_step() ensures that it aborts before | |
4047 it needs to yield. | |
4048 | |
4049 The data structures that is uses to do marking work are the | |
4050 following: | |
4051 | |
4052 (1) Marking Bitmap. If there are gray objects that appear only | |
4053 on the bitmap (this happens either when dealing with an overflow | |
4054 or when the initial marking phase has simply marked the roots | |
4055 and didn't push them on the stack), then tasks claim heap | |
4056 regions whose bitmap they then scan to find gray objects. A | |
4057 global finger indicates where the end of the last claimed region | |
4058 is. A local finger indicates how far into the region a task has | |
4059 scanned. The two fingers are used to determine how to gray an | |
4060 object (i.e. whether simply marking it is OK, as it will be | |
4061 visited by a task in the future, or whether it needs to be also | |
4062 pushed on a stack). | |
4063 | |
4064 (2) Local Queue. The local queue of the task which is accessed | |
4065 reasonably efficiently by the task. Other tasks can steal from | |
4066 it when they run out of work. Throughout the marking phase, a | |
4067 task attempts to keep its local queue short but not totally | |
4068 empty, so that entries are available for stealing by other | |
4069 tasks. Only when there is no more work, a task will totally | |
4070 drain its local queue. | |
4071 | |
4072 (3) Global Mark Stack. This handles local queue overflow. During | |
4073 marking only sets of entries are moved between it and the local | |
4074 queues, as access to it requires a mutex and more fine-grain | |
4075 interaction with it which might cause contention. If it | |
4076 overflows, then the marking phase should restart and iterate | |
4077 over the bitmap to identify gray objects. Throughout the marking | |
4078 phase, tasks attempt to keep the global mark stack at a small | |
4079 length but not totally empty, so that entries are available for | |
4080 popping by other tasks. Only when there is no more work, tasks | |
4081 will totally drain the global mark stack. | |
4082 | |
4083 (4) Global Region Stack. Entries on it correspond to areas of | |
4084 the bitmap that need to be scanned since they contain gray | |
4085 objects. Pushes on the region stack only happen during | |
4086 evacuation pauses and typically correspond to areas covered by | |
4087 GC LABS. If it overflows, then the marking phase should restart | |
4088 and iterate over the bitmap to identify gray objects. Tasks will | |
4089 try to totally drain the region stack as soon as possible. | |
4090 | |
4091 (5) SATB Buffer Queue. This is where completed SATB buffers are | |
4092 made available. Buffers are regularly removed from this queue | |
4093 and scanned for roots, so that the queue doesn't get too | |
4094 long. During remark, all completed buffers are processed, as | |
4095 well as the filled in parts of any uncompleted buffers. | |
4096 | |
4097 The do_marking_step() method tries to abort when the time target | |
4098 has been reached. There are a few other cases when the | |
4099 do_marking_step() method also aborts: | |
4100 | |
4101 (1) When the marking phase has been aborted (after a Full GC). | |
4102 | |
4103 (2) When a global overflow (either on the global stack or the | |
4104 region stack) has been triggered. Before the task aborts, it | |
4105 will actually sync up with the other tasks to ensure that all | |
4106 the marking data structures (local queues, stacks, fingers etc.) | |
4107 are re-initialised so that when do_marking_step() completes, | |
4108 the marking phase can immediately restart. | |
4109 | |
4110 (3) When enough completed SATB buffers are available. The | |
4111 do_marking_step() method only tries to drain SATB buffers right | |
4112 at the beginning. So, if enough buffers are available, the | |
4113 marking step aborts and the SATB buffers are processed at | |
4114 the beginning of the next invocation. | |
4115 | |
4116 (4) To yield. when we have to yield then we abort and yield | |
4117 right at the end of do_marking_step(). This saves us from a lot | |
4118 of hassle as, by yielding we might allow a Full GC. If this | |
4119 happens then objects will be compacted underneath our feet, the | |
4120 heap might shrink, etc. We save checking for this by just | |
4121 aborting and doing the yield right at the end. | |
4122 | |
4123 From the above it follows that the do_marking_step() method should | |
4124 be called in a loop (or, otherwise, regularly) until it completes. | |
4125 | |
4126 If a marking step completes without its has_aborted() flag being | |
4127 true, it means it has completed the current marking phase (and | |
4128 also all other marking tasks have done so and have all synced up). | |
4129 | |
4130 A method called regular_clock_call() is invoked "regularly" (in | |
4131 sub ms intervals) throughout marking. It is this clock method that | |
4132 checks all the abort conditions which were mentioned above and | |
4133 decides when the task should abort. A work-based scheme is used to | |
4134 trigger this clock method: when the number of object words the | |
4135 marking phase has scanned or the number of references the marking | |
4136 phase has visited reach a given limit. Additional invocations to | |
4137 the method clock have been planted in a few other strategic places | |
4138 too. The initial reason for the clock method was to avoid calling | |
4139 vtime too regularly, as it is quite expensive. So, once it was in | |
4140 place, it was natural to piggy-back all the other conditions on it | |
4141 too and not constantly check them throughout the code. | |
4142 | |
4143 *****************************************************************************/ | |
4144 | |
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4145 void CMTask::do_marking_step(double time_target_ms, |
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4146 bool do_stealing, |
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4147 bool do_termination) { |
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4148 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4149 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4150 |
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4151 assert(concurrent() || _cm->region_stack_empty(), |
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4152 "the region stack should have been cleared before remark"); |
1835
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4153 assert(concurrent() || !_cm->has_aborted_regions(), |
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4154 "aborted regions should have been cleared before remark"); |
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4155 assert(_region_finger == NULL, |
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4156 "this should be non-null only when a region is being scanned"); |
342 | 4157 |
4158 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
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4159 assert(_task_queues != NULL, "invariant"); |
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4160 assert(_task_queue != NULL, "invariant"); |
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4161 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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4162 |
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4163 assert(!_claimed, |
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4164 "only one thread should claim this task at any one time"); |
342 | 4165 |
4166 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4167 // possible for two threads to set the _claimed flag at the same | |
4168 // time. But it is only for debugging purposes anyway and it will | |
4169 // catch most problems. | |
4170 _claimed = true; | |
4171 | |
4172 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4173 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4174 | |
4175 double diff_prediction_ms = | |
4176 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4177 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4178 | |
4179 // set up the variables that are used in the work-based scheme to | |
4180 // call the regular clock method | |
4181 _words_scanned = 0; | |
4182 _refs_reached = 0; | |
4183 recalculate_limits(); | |
4184 | |
4185 // clear all flags | |
4186 clear_has_aborted(); | |
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4187 _has_timed_out = false; |
342 | 4188 _draining_satb_buffers = false; |
4189 | |
4190 ++_calls; | |
4191 | |
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4192 if (_cm->verbose_low()) { |
342 | 4193 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
4194 "target = %1.2lfms >>>>>>>>>>", | |
4195 _task_id, _calls, _time_target_ms); | |
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4196 } |
342 | 4197 |
4198 // Set up the bitmap and oop closures. Anything that uses them is | |
4199 // eventually called from this method, so it is OK to allocate these | |
4200 // statically. | |
4201 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4202 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4203 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4204 |
4205 if (_cm->has_overflown()) { | |
4206 // This can happen if the region stack or the mark stack overflows | |
4207 // during a GC pause and this task, after a yield point, | |
4208 // restarts. We have to abort as we need to get into the overflow | |
4209 // protocol which happens right at the end of this task. | |
4210 set_has_aborted(); | |
4211 } | |
4212 | |
4213 // First drain any available SATB buffers. After this, we will not | |
4214 // look at SATB buffers before the next invocation of this method. | |
4215 // If enough completed SATB buffers are queued up, the regular clock | |
4216 // will abort this task so that it restarts. | |
4217 drain_satb_buffers(); | |
4218 // ...then partially drain the local queue and the global stack | |
4219 drain_local_queue(true); | |
4220 drain_global_stack(true); | |
4221 | |
4222 // Then totally drain the region stack. We will not look at | |
4223 // it again before the next invocation of this method. Entries on | |
4224 // the region stack are only added during evacuation pauses, for | |
4225 // which we have to yield. When we do, we abort the task anyway so | |
4226 // it will look at the region stack again when it restarts. | |
4227 bitmap_closure.set_scanning_heap_region(false); | |
4228 drain_region_stack(&bitmap_closure); | |
4229 // ...then partially drain the local queue and the global stack | |
4230 drain_local_queue(true); | |
4231 drain_global_stack(true); | |
4232 | |
4233 do { | |
4234 if (!has_aborted() && _curr_region != NULL) { | |
4235 // This means that we're already holding on to a region. | |
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4236 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4237 "should not be NULL either"); |
342 | 4238 |
4239 // We might have restarted this task after an evacuation pause | |
4240 // which might have evacuated the region we're holding on to | |
4241 // underneath our feet. Let's read its limit again to make sure | |
4242 // that we do not iterate over a region of the heap that | |
4243 // contains garbage (update_region_limit() will also move | |
4244 // _finger to the start of the region if it is found empty). | |
4245 update_region_limit(); | |
4246 // We will start from _finger not from the start of the region, | |
4247 // as we might be restarting this task after aborting half-way | |
4248 // through scanning this region. In this case, _finger points to | |
4249 // the address where we last found a marked object. If this is a | |
4250 // fresh region, _finger points to start(). | |
4251 MemRegion mr = MemRegion(_finger, _region_limit); | |
4252 | |
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4253 if (_cm->verbose_low()) { |
342 | 4254 gclog_or_tty->print_cr("[%d] we're scanning part " |
4255 "["PTR_FORMAT", "PTR_FORMAT") " | |
4256 "of region "PTR_FORMAT, | |
4257 _task_id, _finger, _region_limit, _curr_region); | |
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4258 } |
342 | 4259 |
4260 // Let's iterate over the bitmap of the part of the | |
4261 // region that is left. | |
4262 bitmap_closure.set_scanning_heap_region(true); | |
4263 if (mr.is_empty() || | |
4264 _nextMarkBitMap->iterate(&bitmap_closure, mr)) { | |
4265 // We successfully completed iterating over the region. Now, | |
4266 // let's give up the region. | |
4267 giveup_current_region(); | |
4268 regular_clock_call(); | |
4269 } else { | |
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4270 assert(has_aborted(), "currently the only way to do so"); |
342 | 4271 // The only way to abort the bitmap iteration is to return |
4272 // false from the do_bit() method. However, inside the | |
4273 // do_bit() method we move the _finger to point to the | |
4274 // object currently being looked at. So, if we bail out, we | |
4275 // have definitely set _finger to something non-null. | |
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4276 assert(_finger != NULL, "invariant"); |
342 | 4277 |
4278 // Region iteration was actually aborted. So now _finger | |
4279 // points to the address of the object we last scanned. If we | |
4280 // leave it there, when we restart this task, we will rescan | |
4281 // the object. It is easy to avoid this. We move the finger by | |
4282 // enough to point to the next possible object header (the | |
4283 // bitmap knows by how much we need to move it as it knows its | |
4284 // granularity). | |
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4285 assert(_finger < _region_limit, "invariant"); |
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4286 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
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4287 // Check if bitmap iteration was aborted while scanning the last object |
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4288 if (new_finger >= _region_limit) { |
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4289 giveup_current_region(); |
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4290 } else { |
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4291 move_finger_to(new_finger); |
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4292 } |
342 | 4293 } |
4294 } | |
4295 // At this point we have either completed iterating over the | |
4296 // region we were holding on to, or we have aborted. | |
4297 | |
4298 // We then partially drain the local queue and the global stack. | |
4299 // (Do we really need this?) | |
4300 drain_local_queue(true); | |
4301 drain_global_stack(true); | |
4302 | |
4303 // Read the note on the claim_region() method on why it might | |
4304 // return NULL with potentially more regions available for | |
4305 // claiming and why we have to check out_of_regions() to determine | |
4306 // whether we're done or not. | |
4307 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4308 // We are going to try to claim a new region. We should have | |
4309 // given up on the previous one. | |
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4310 // Separated the asserts so that we know which one fires. |
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4311 assert(_curr_region == NULL, "invariant"); |
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4312 assert(_finger == NULL, "invariant"); |
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4313 assert(_region_limit == NULL, "invariant"); |
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4314 if (_cm->verbose_low()) { |
342 | 4315 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
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4316 } |
342 | 4317 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
4318 if (claimed_region != NULL) { | |
4319 // Yes, we managed to claim one | |
4320 statsOnly( ++_regions_claimed ); | |
4321 | |
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4322 if (_cm->verbose_low()) { |
342 | 4323 gclog_or_tty->print_cr("[%d] we successfully claimed " |
4324 "region "PTR_FORMAT, | |
4325 _task_id, claimed_region); | |
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4326 } |
342 | 4327 |
4328 setup_for_region(claimed_region); | |
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4329 assert(_curr_region == claimed_region, "invariant"); |
342 | 4330 } |
4331 // It is important to call the regular clock here. It might take | |
4332 // a while to claim a region if, for example, we hit a large | |
4333 // block of empty regions. So we need to call the regular clock | |
4334 // method once round the loop to make sure it's called | |
4335 // frequently enough. | |
4336 regular_clock_call(); | |
4337 } | |
4338 | |
4339 if (!has_aborted() && _curr_region == NULL) { | |
1023
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1022
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|
4340 assert(_cm->out_of_regions(), |
11d4857fe5e1
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|
4341 "at this point we should be out of regions"); |
342 | 4342 } |
4343 } while ( _curr_region != NULL && !has_aborted()); | |
4344 | |
4345 if (!has_aborted()) { | |
4346 // We cannot check whether the global stack is empty, since other | |
343
afc1ce1efe66
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diff
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|
4347 // tasks might be pushing objects to it concurrently. We also cannot |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
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|
4348 // check if the region stack is empty because if a thread is aborting |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
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diff
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|
4349 // it can push a partially done region back. |
1023
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|
4350 assert(_cm->out_of_regions(), |
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|
4351 "at this point we should be out of regions"); |
342 | 4352 |
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|
4353 if (_cm->verbose_low()) { |
342 | 4354 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
3776
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|
4355 } |
342 | 4356 |
4357 // Try to reduce the number of available SATB buffers so that | |
4358 // remark has less work to do. | |
4359 drain_satb_buffers(); | |
4360 } | |
4361 | |
4362 // Since we've done everything else, we can now totally drain the | |
4363 // local queue and global stack. | |
4364 drain_local_queue(false); | |
4365 drain_global_stack(false); | |
4366 | |
4367 // Attempt at work stealing from other task's queues. | |
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|
4368 if (do_stealing && !has_aborted()) { |
342 | 4369 // We have not aborted. This means that we have finished all that |
4370 // we could. Let's try to do some stealing... | |
4371 | |
4372 // We cannot check whether the global stack is empty, since other | |
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
changeset
|
4373 // tasks might be pushing objects to it concurrently. We also cannot |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
342
diff
changeset
|
4374 // check if the region stack is empty because if a thread is aborting |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
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|
4375 // it can push a partially done region back. |
1023
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|
4376 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
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|
4377 "only way to reach here"); |
342 | 4378 |
3776
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|
4379 if (_cm->verbose_low()) { |
342 | 4380 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
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|
4381 } |
342 | 4382 |
4383 while (!has_aborted()) { | |
4384 oop obj; | |
4385 statsOnly( ++_steal_attempts ); | |
4386 | |
4387 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
3776
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|
4388 if (_cm->verbose_medium()) { |
342 | 4389 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
4390 _task_id, (void*) obj); | |
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|
4391 } |
342 | 4392 |
4393 statsOnly( ++_steals ); | |
4394 | |
1023
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|
4395 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
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|
4396 "any stolen object should be marked"); |
342 | 4397 scan_object(obj); |
4398 | |
4399 // And since we're towards the end, let's totally drain the | |
4400 // local queue and global stack. | |
4401 drain_local_queue(false); | |
4402 drain_global_stack(false); | |
4403 } else { | |
4404 break; | |
4405 } | |
4406 } | |
4407 } | |
4408 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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diff
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|
4409 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4410 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
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|
4411 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
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diff
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|
4412 if (_cm->force_overflow()->should_force()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
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|
4413 _cm->set_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
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|
4414 regular_clock_call(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
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|
4415 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4416 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4417 |
342 | 4418 // We still haven't aborted. Now, let's try to get into the |
4419 // termination protocol. | |
2174
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|
4420 if (do_termination && !has_aborted()) { |
342 | 4421 // We cannot check whether the global stack is empty, since other |
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
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|
4422 // tasks might be concurrently pushing objects on it. We also cannot |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
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|
4423 // check if the region stack is empty because if a thread is aborting |
afc1ce1efe66
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|
4424 // it can push a partially done region back. |
1023
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|
4425 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
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|
4426 assert(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
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|
4427 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4428 |
3776
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|
4429 if (_cm->verbose_low()) { |
342 | 4430 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
3776
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|
4431 } |
342 | 4432 |
4433 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
4434 // The CMTask class also extends the TerminatorTerminator class, | |
4435 // hence its should_exit_termination() method will also decide | |
4436 // whether to exit the termination protocol or not. | |
4437 bool finished = _cm->terminator()->offer_termination(this); | |
4438 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
4439 _termination_time_ms += | |
4440 termination_end_time_ms - _termination_start_time_ms; | |
4441 | |
4442 if (finished) { | |
4443 // We're all done. | |
4444 | |
4445 if (_task_id == 0) { | |
4446 // let's allow task 0 to do this | |
4447 if (concurrent()) { | |
1023
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|
4448 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4449 // we need to set this to false before the next |
4450 // safepoint. This way we ensure that the marking phase | |
4451 // doesn't observe any more heap expansions. | |
4452 _cm->clear_concurrent_marking_in_progress(); | |
4453 } | |
4454 } | |
4455 | |
4456 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4457 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
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|
4458 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
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|
4459 // which one. |
11d4857fe5e1
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|
4460 guarantee(_cm->out_of_regions(), "only way to reach here"); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
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|
4461 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
1023
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changeset
|
4462 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
11d4857fe5e1
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|
4463 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
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|
4464 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
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|
4465 guarantee(!_cm->has_overflown(), "only way to reach here"); |
11d4857fe5e1
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|
4466 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
11d4857fe5e1
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|
4467 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
342 | 4468 |
3776
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|
4469 if (_cm->verbose_low()) { |
342 | 4470 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
3776
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|
4471 } |
342 | 4472 } else { |
4473 // Apparently there's more work to do. Let's abort this task. It | |
4474 // will restart it and we can hopefully find more things to do. | |
4475 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4476 if (_cm->verbose_low()) { |
23d434c6290d
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changeset
|
4477 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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|
4478 _task_id); |
23d434c6290d
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|
4479 } |
342 | 4480 |
4481 set_has_aborted(); | |
4482 statsOnly( ++_aborted_termination ); | |
4483 } | |
4484 } | |
4485 | |
4486 // Mainly for debugging purposes to make sure that a pointer to the | |
4487 // closure which was statically allocated in this frame doesn't | |
4488 // escape it by accident. | |
3771 | 4489 set_cm_oop_closure(NULL); |
342 | 4490 double end_time_ms = os::elapsedVTime() * 1000.0; |
4491 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4492 // Update the step history. | |
4493 _step_times_ms.add(elapsed_time_ms); | |
4494 | |
4495 if (has_aborted()) { | |
4496 // The task was aborted for some reason. | |
4497 | |
4498 statsOnly( ++_aborted ); | |
4499 | |
2174
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|
4500 if (_has_timed_out) { |
342 | 4501 double diff_ms = elapsed_time_ms - _time_target_ms; |
4502 // Keep statistics of how well we did with respect to hitting | |
4503 // our target only if we actually timed out (if we aborted for | |
4504 // other reasons, then the results might get skewed). | |
4505 _marking_step_diffs_ms.add(diff_ms); | |
4506 } | |
4507 | |
4508 if (_cm->has_overflown()) { | |
4509 // This is the interesting one. We aborted because a global | |
4510 // overflow was raised. This means we have to restart the | |
4511 // marking phase and start iterating over regions. However, in | |
4512 // order to do this we have to make sure that all tasks stop | |
4513 // what they are doing and re-initialise in a safe manner. We | |
4514 // will achieve this with the use of two barrier sync points. | |
4515 | |
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|
4516 if (_cm->verbose_low()) { |
342 | 4517 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
3776
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|
4518 } |
342 | 4519 |
4520 _cm->enter_first_sync_barrier(_task_id); | |
4521 // When we exit this sync barrier we know that all tasks have | |
4522 // stopped doing marking work. So, it's now safe to | |
4523 // re-initialise our data structures. At the end of this method, | |
4524 // task 0 will clear the global data structures. | |
4525 | |
4526 statsOnly( ++_aborted_overflow ); | |
4527 | |
4528 // We clear the local state of this task... | |
4529 clear_region_fields(); | |
4530 | |
4531 // ...and enter the second barrier. | |
4532 _cm->enter_second_sync_barrier(_task_id); | |
4533 // At this point everything has bee re-initialised and we're | |
4534 // ready to restart. | |
4535 } | |
4536 | |
4537 if (_cm->verbose_low()) { | |
4538 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
4539 "elapsed = %1.2lfms <<<<<<<<<<", | |
4540 _task_id, _time_target_ms, elapsed_time_ms); | |
3776
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|
4541 if (_cm->has_aborted()) { |
342 | 4542 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
4543 _task_id); | |
3776
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|
4544 } |
342 | 4545 } |
4546 } else { | |
3776
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|
4547 if (_cm->verbose_low()) { |
342 | 4548 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
4549 "elapsed = %1.2lfms <<<<<<<<<<", | |
4550 _task_id, _time_target_ms, elapsed_time_ms); | |
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|
4551 } |
342 | 4552 } |
4553 | |
4554 _claimed = false; | |
4555 } | |
4556 | |
4557 CMTask::CMTask(int task_id, | |
4558 ConcurrentMark* cm, | |
4559 CMTaskQueue* task_queue, | |
4560 CMTaskQueueSet* task_queues) | |
4561 : _g1h(G1CollectedHeap::heap()), | |
4562 _task_id(task_id), _cm(cm), | |
4563 _claimed(false), | |
4564 _nextMarkBitMap(NULL), _hash_seed(17), | |
4565 _task_queue(task_queue), | |
4566 _task_queues(task_queues), | |
3771 | 4567 _cm_oop_closure(NULL), |
1835
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6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
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|
4568 _aborted_region(MemRegion()) { |
1023
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|
4569 guarantee(task_queue != NULL, "invariant"); |
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|
4570 guarantee(task_queues != NULL, "invariant"); |
342 | 4571 |
4572 statsOnly( _clock_due_to_scanning = 0; | |
4573 _clock_due_to_marking = 0 ); | |
4574 | |
4575 _marking_step_diffs_ms.add(0.5); | |
4576 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4577 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4578 // These are formatting macros that are used below to ensure |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4579 // consistent formatting. The *_H_* versions are used to format the |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4580 // header for a particular value and they should be kept consistent |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
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|
4581 // with the corresponding macro. Also note that most of the macros add |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
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|
4582 // the necessary white space (as a prefix) which makes them a bit |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4583 // easier to compose. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4584 |
371bbc844bf1
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changeset
|
4585 // All the output lines are prefixed with this string to be able to |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4586 // 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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|
4587 #define G1PPRL_LINE_PREFIX "###" |
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|
4588 |
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|
4589 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
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|
4590 #ifdef _LP64 |
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|
4591 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
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|
4592 #else // _LP64 |
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|
4593 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
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|
4594 #endif // _LP64 |
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|
4595 |
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|
4596 // For per-region info |
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|
4597 #define G1PPRL_TYPE_FORMAT " %-4s" |
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|
4598 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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|
4599 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
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|
4600 #define G1PPRL_BYTE_H_FORMAT " %9s" |
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|
4601 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
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|
4602 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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|
4603 |
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|
4604 // For summary info |
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|
4605 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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4606 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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4607 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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4608 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4609 |
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|
4610 G1PrintRegionLivenessInfoClosure:: |
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4611 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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|
4612 : _out(out), |
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4613 _total_used_bytes(0), _total_capacity_bytes(0), |
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|
4614 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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4615 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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|
4616 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
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|
4617 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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4618 MemRegion g1_committed = g1h->g1_committed(); |
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4619 MemRegion g1_reserved = g1h->g1_reserved(); |
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|
4620 double now = os::elapsedTime(); |
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|
4621 |
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|
4622 // Print the header of the output. |
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|
4623 _out->cr(); |
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|
4624 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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|
4625 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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|
4626 G1PPRL_SUM_ADDR_FORMAT("committed") |
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|
4627 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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|
4628 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
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|
4629 g1_committed.start(), g1_committed.end(), |
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|
4630 g1_reserved.start(), g1_reserved.end(), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
4631 HeapRegion::GrainBytes); |
2435
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|
4632 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4633 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4634 G1PPRL_TYPE_H_FORMAT |
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|
4635 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4636 G1PPRL_BYTE_H_FORMAT |
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|
4637 G1PPRL_BYTE_H_FORMAT |
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|
4638 G1PPRL_BYTE_H_FORMAT |
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|
4639 G1PPRL_DOUBLE_H_FORMAT, |
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|
4640 "type", "address-range", |
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|
4641 "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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|
4642 _out->print_cr(G1PPRL_LINE_PREFIX |
5cc33133bc6d
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|
4643 G1PPRL_TYPE_H_FORMAT |
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7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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|
4644 G1PPRL_ADDR_BASE_H_FORMAT |
5cc33133bc6d
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|
4645 G1PPRL_BYTE_H_FORMAT |
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|
4646 G1PPRL_BYTE_H_FORMAT |
5cc33133bc6d
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diff
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|
4647 G1PPRL_BYTE_H_FORMAT |
5cc33133bc6d
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|
4648 G1PPRL_DOUBLE_H_FORMAT, |
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
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|
4649 "", "", |
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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parents:
3975
diff
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|
4650 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
2435
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|
4651 } |
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|
4652 |
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|
4653 // It takes as a parameter a reference to one of the _hum_* fields, it |
371bbc844bf1
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|
4654 // deduces the corresponding value for a region in a humongous region |
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|
4655 // series (either the region size, or what's left if the _hum_* field |
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|
4656 // is < the region size), and updates the _hum_* field accordingly. |
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|
4657 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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|
4658 size_t bytes = 0; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4659 // The > 0 check is to deal with the prev and next live bytes which |
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|
4660 // could be 0. |
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|
4661 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4662 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
371bbc844bf1
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|
4663 *hum_bytes -= bytes; |
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|
4664 } |
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diff
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|
4665 return bytes; |
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diff
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|
4666 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4667 |
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|
4668 // It deduces the values for a region in a humongous region series |
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|
4669 // from the _hum_* fields and updates those accordingly. It assumes |
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|
4670 // that that _hum_* fields have already been set up from the "starts |
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|
4671 // humongous" region and we visit the regions in address order. |
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|
4672 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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|
4673 size_t* capacity_bytes, |
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|
4674 size_t* prev_live_bytes, |
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|
4675 size_t* next_live_bytes) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4676 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
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|
4677 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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|
4678 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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|
4679 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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|
4680 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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|
4681 } |
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|
4682 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4683 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4684 const char* type = ""; |
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|
4685 HeapWord* bottom = r->bottom(); |
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|
4686 HeapWord* end = r->end(); |
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|
4687 size_t capacity_bytes = r->capacity(); |
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|
4688 size_t used_bytes = r->used(); |
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|
4689 size_t prev_live_bytes = r->live_bytes(); |
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|
4690 size_t next_live_bytes = r->next_live_bytes(); |
371bbc844bf1
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|
4691 double gc_eff = r->gc_efficiency(); |
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|
4692 if (r->used() == 0) { |
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|
4693 type = "FREE"; |
371bbc844bf1
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diff
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|
4694 } else if (r->is_survivor()) { |
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|
4695 type = "SURV"; |
371bbc844bf1
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diff
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|
4696 } else if (r->is_young()) { |
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|
4697 type = "EDEN"; |
371bbc844bf1
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|
4698 } else if (r->startsHumongous()) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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4699 type = "HUMS"; |
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|
4700 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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4701 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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4702 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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4703 "they should have been zeroed after the last time we used them"); |
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4704 // Set up the _hum_* fields. |
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4705 _hum_capacity_bytes = capacity_bytes; |
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4706 _hum_used_bytes = used_bytes; |
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4707 _hum_prev_live_bytes = prev_live_bytes; |
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4708 _hum_next_live_bytes = next_live_bytes; |
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4709 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4710 &prev_live_bytes, &next_live_bytes); |
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4711 end = bottom + HeapRegion::GrainWords; |
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4712 } else if (r->continuesHumongous()) { |
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4713 type = "HUMC"; |
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4714 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4715 &prev_live_bytes, &next_live_bytes); |
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4716 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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4717 } else { |
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4718 type = "OLD"; |
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|
4719 } |
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|
4720 |
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4721 _total_used_bytes += used_bytes; |
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4722 _total_capacity_bytes += capacity_bytes; |
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4723 _total_prev_live_bytes += prev_live_bytes; |
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4724 _total_next_live_bytes += next_live_bytes; |
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|
4725 |
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|
4726 // Print a line for this particular region. |
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4727 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4728 G1PPRL_TYPE_FORMAT |
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|
4729 G1PPRL_ADDR_BASE_FORMAT |
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|
4730 G1PPRL_BYTE_FORMAT |
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|
4731 G1PPRL_BYTE_FORMAT |
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|
4732 G1PPRL_BYTE_FORMAT |
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|
4733 G1PPRL_DOUBLE_FORMAT, |
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|
4734 type, bottom, end, |
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4735 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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|
4736 |
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|
4737 return false; |
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diff
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|
4738 } |
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diff
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|
4739 |
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|
4740 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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|
4741 // Print the footer of the output. |
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|
4742 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4743 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4744 " SUMMARY" |
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|
4745 G1PPRL_SUM_MB_FORMAT("capacity") |
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|
4746 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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|
4747 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
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|
4748 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
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|
4749 bytes_to_mb(_total_capacity_bytes), |
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changeset
|
4750 bytes_to_mb(_total_used_bytes), |
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|
4751 perc(_total_used_bytes, _total_capacity_bytes), |
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diff
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|
4752 bytes_to_mb(_total_prev_live_bytes), |
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|
4753 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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|
4754 bytes_to_mb(_total_next_live_bytes), |
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diff
changeset
|
4755 perc(_total_next_live_bytes, _total_capacity_bytes)); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4756 _out->cr(); |
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changeset
|
4757 } |