Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 3776:23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
Summary: Only cosmetic changes to make the concurrentMark.* more consistent, code-style-wise, with the rest of the codebase.
Reviewed-by: johnc, ysr
author | tonyp |
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date | Mon, 20 Jun 2011 22:03:13 -0400 |
parents | 6747fd0512e0 |
children | 5f6f2615433a |
rev | line source |
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342 | 1 /* |
2149 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
3771 | 31 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 32 #include "gc_implementation/g1/g1RemSet.hpp" |
33 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
34 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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35 #include "gc_implementation/shared/vmGCOperations.hpp" |
1972 | 36 #include "memory/genOopClosures.inline.hpp" |
37 #include "memory/referencePolicy.hpp" | |
38 #include "memory/resourceArea.hpp" | |
39 #include "oops/oop.inline.hpp" | |
40 #include "runtime/handles.inline.hpp" | |
41 #include "runtime/java.hpp" | |
342 | 42 |
43 // | |
44 // CMS Bit Map Wrapper | |
45 | |
46 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter): | |
47 _bm((uintptr_t*)NULL,0), | |
48 _shifter(shifter) { | |
49 _bmStartWord = (HeapWord*)(rs.base()); | |
50 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
51 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
52 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
53 | |
54 guarantee(brs.is_reserved(), "couldn't allocate CMS bit map"); | |
55 // For now we'll just commit all of the bit map up fromt. | |
56 // Later on we'll try to be more parsimonious with swap. | |
57 guarantee(_virtual_space.initialize(brs, brs.size()), | |
58 "couldn't reseve backing store for CMS bit map"); | |
59 assert(_virtual_space.committed_size() == brs.size(), | |
60 "didn't reserve backing store for all of CMS bit map?"); | |
61 _bm.set_map((uintptr_t*)_virtual_space.low()); | |
62 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
63 _bmWordSize, "inconsistency in bit map sizing"); | |
64 _bm.set_size(_bmWordSize >> _shifter); | |
65 } | |
66 | |
67 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
68 HeapWord* limit) const { | |
69 // First we must round addr *up* to a possible object boundary. | |
70 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
71 HeapWordSize << _shifter); | |
72 size_t addrOffset = heapWordToOffset(addr); | |
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73 if (limit == NULL) { |
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74 limit = _bmStartWord + _bmWordSize; |
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75 } |
342 | 76 size_t limitOffset = heapWordToOffset(limit); |
77 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
78 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
79 assert(nextAddr >= addr, "get_next_one postcondition"); | |
80 assert(nextAddr == limit || isMarked(nextAddr), | |
81 "get_next_one postcondition"); | |
82 return nextAddr; | |
83 } | |
84 | |
85 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
86 HeapWord* limit) const { | |
87 size_t addrOffset = heapWordToOffset(addr); | |
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88 if (limit == NULL) { |
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89 limit = _bmStartWord + _bmWordSize; |
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90 } |
342 | 91 size_t limitOffset = heapWordToOffset(limit); |
92 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
93 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
94 assert(nextAddr >= addr, "get_next_one postcondition"); | |
95 assert(nextAddr == limit || !isMarked(nextAddr), | |
96 "get_next_one postcondition"); | |
97 return nextAddr; | |
98 } | |
99 | |
100 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
101 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
102 return (int) (diff >> _shifter); | |
103 } | |
104 | |
105 bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) { | |
106 HeapWord* left = MAX2(_bmStartWord, mr.start()); | |
107 HeapWord* right = MIN2(_bmStartWord + _bmWordSize, mr.end()); | |
108 if (right > left) { | |
109 // Right-open interval [leftOffset, rightOffset). | |
110 return _bm.iterate(cl, heapWordToOffset(left), heapWordToOffset(right)); | |
111 } else { | |
112 return true; | |
113 } | |
114 } | |
115 | |
116 void CMBitMapRO::mostly_disjoint_range_union(BitMap* from_bitmap, | |
117 size_t from_start_index, | |
118 HeapWord* to_start_word, | |
119 size_t word_num) { | |
120 _bm.mostly_disjoint_range_union(from_bitmap, | |
121 from_start_index, | |
122 heapWordToOffset(to_start_word), | |
123 word_num); | |
124 } | |
125 | |
126 #ifndef PRODUCT | |
127 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
128 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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129 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
342 | 130 "size inconsistency"); |
131 return _bmStartWord == (HeapWord*)(rs.base()) && | |
132 _bmWordSize == rs.size()>>LogHeapWordSize; | |
133 } | |
134 #endif | |
135 | |
136 void CMBitMap::clearAll() { | |
137 _bm.clear(); | |
138 return; | |
139 } | |
140 | |
141 void CMBitMap::markRange(MemRegion mr) { | |
142 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
143 assert(!mr.is_empty(), "unexpected empty region"); | |
144 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
145 ((HeapWord *) mr.end())), | |
146 "markRange memory region end is not card aligned"); | |
147 // convert address range into offset range | |
148 _bm.at_put_range(heapWordToOffset(mr.start()), | |
149 heapWordToOffset(mr.end()), true); | |
150 } | |
151 | |
152 void CMBitMap::clearRange(MemRegion mr) { | |
153 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
154 assert(!mr.is_empty(), "unexpected empty region"); | |
155 // convert address range into offset range | |
156 _bm.at_put_range(heapWordToOffset(mr.start()), | |
157 heapWordToOffset(mr.end()), false); | |
158 } | |
159 | |
160 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
161 HeapWord* end_addr) { | |
162 HeapWord* start = getNextMarkedWordAddress(addr); | |
163 start = MIN2(start, end_addr); | |
164 HeapWord* end = getNextUnmarkedWordAddress(start); | |
165 end = MIN2(end, end_addr); | |
166 assert(start <= end, "Consistency check"); | |
167 MemRegion mr(start, end); | |
168 if (!mr.is_empty()) { | |
169 clearRange(mr); | |
170 } | |
171 return mr; | |
172 } | |
173 | |
174 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
175 _base(NULL), _cm(cm) | |
176 #ifdef ASSERT | |
177 , _drain_in_progress(false) | |
178 , _drain_in_progress_yields(false) | |
179 #endif | |
180 {} | |
181 | |
182 void CMMarkStack::allocate(size_t size) { | |
183 _base = NEW_C_HEAP_ARRAY(oop, size); | |
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184 if (_base == NULL) { |
342 | 185 vm_exit_during_initialization("Failed to allocate " |
186 "CM region mark stack"); | |
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187 } |
342 | 188 _index = 0; |
189 _capacity = (jint) size; | |
190 _oops_do_bound = -1; | |
191 NOT_PRODUCT(_max_depth = 0); | |
192 } | |
193 | |
194 CMMarkStack::~CMMarkStack() { | |
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195 if (_base != NULL) { |
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196 FREE_C_HEAP_ARRAY(oop, _base); |
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197 } |
342 | 198 } |
199 | |
200 void CMMarkStack::par_push(oop ptr) { | |
201 while (true) { | |
202 if (isFull()) { | |
203 _overflow = true; | |
204 return; | |
205 } | |
206 // Otherwise... | |
207 jint index = _index; | |
208 jint next_index = index+1; | |
209 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
210 if (res == index) { | |
211 _base[index] = ptr; | |
212 // Note that we don't maintain this atomically. We could, but it | |
213 // doesn't seem necessary. | |
214 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
215 return; | |
216 } | |
217 // Otherwise, we need to try again. | |
218 } | |
219 } | |
220 | |
221 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
222 while (true) { | |
223 if (isFull()) { | |
224 _overflow = true; | |
225 return; | |
226 } | |
227 // Otherwise... | |
228 jint index = _index; | |
229 jint next_index = index + n; | |
230 if (next_index > _capacity) { | |
231 _overflow = true; | |
232 return; | |
233 } | |
234 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
235 if (res == index) { | |
236 for (int i = 0; i < n; i++) { | |
237 int ind = index + i; | |
238 assert(ind < _capacity, "By overflow test above."); | |
239 _base[ind] = ptr_arr[i]; | |
240 } | |
241 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
242 return; | |
243 } | |
244 // Otherwise, we need to try again. | |
245 } | |
246 } | |
247 | |
248 | |
249 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
250 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
251 jint start = _index; | |
252 jint next_index = start + n; | |
253 if (next_index > _capacity) { | |
254 _overflow = true; | |
255 return; | |
256 } | |
257 // Otherwise. | |
258 _index = next_index; | |
259 for (int i = 0; i < n; i++) { | |
260 int ind = start + i; | |
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261 assert(ind < _capacity, "By overflow test above."); |
342 | 262 _base[ind] = ptr_arr[i]; |
263 } | |
264 } | |
265 | |
266 | |
267 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
268 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
269 jint index = _index; | |
270 if (index == 0) { | |
271 *n = 0; | |
272 return false; | |
273 } else { | |
274 int k = MIN2(max, index); | |
275 jint new_ind = index - k; | |
276 for (int j = 0; j < k; j++) { | |
277 ptr_arr[j] = _base[new_ind + j]; | |
278 } | |
279 _index = new_ind; | |
280 *n = k; | |
281 return true; | |
282 } | |
283 } | |
284 | |
285 | |
286 CMRegionStack::CMRegionStack() : _base(NULL) {} | |
287 | |
288 void CMRegionStack::allocate(size_t size) { | |
289 _base = NEW_C_HEAP_ARRAY(MemRegion, size); | |
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290 if (_base == NULL) { |
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291 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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292 } |
342 | 293 _index = 0; |
294 _capacity = (jint) size; | |
295 } | |
296 | |
297 CMRegionStack::~CMRegionStack() { | |
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298 if (_base != NULL) { |
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299 FREE_C_HEAP_ARRAY(oop, _base); |
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300 } |
342 | 301 } |
302 | |
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303 void CMRegionStack::push_lock_free(MemRegion mr) { |
342 | 304 assert(mr.word_size() > 0, "Precondition"); |
305 while (true) { | |
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306 jint index = _index; |
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307 |
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308 if (index >= _capacity) { |
342 | 309 _overflow = true; |
310 return; | |
311 } | |
312 // Otherwise... | |
313 jint next_index = index+1; | |
314 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
315 if (res == index) { | |
316 _base[index] = mr; | |
317 return; | |
318 } | |
319 // Otherwise, we need to try again. | |
320 } | |
321 } | |
322 | |
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323 // Lock-free pop of the region stack. Called during the concurrent |
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324 // marking / remark phases. Should only be called in tandem with |
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325 // other lock-free pops. |
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326 MemRegion CMRegionStack::pop_lock_free() { |
342 | 327 while (true) { |
328 jint index = _index; | |
329 | |
330 if (index == 0) { | |
331 return MemRegion(); | |
332 } | |
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333 // Otherwise... |
342 | 334 jint next_index = index-1; |
335 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
336 if (res == index) { | |
337 MemRegion mr = _base[next_index]; | |
338 if (mr.start() != NULL) { | |
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339 assert(mr.end() != NULL, "invariant"); |
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340 assert(mr.word_size() > 0, "invariant"); |
342 | 341 return mr; |
342 } else { | |
343 // that entry was invalidated... let's skip it | |
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344 assert(mr.end() == NULL, "invariant"); |
342 | 345 } |
346 } | |
347 // Otherwise, we need to try again. | |
348 } | |
349 } | |
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350 |
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351 #if 0 |
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352 // The routines that manipulate the region stack with a lock are |
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353 // not currently used. They should be retained, however, as a |
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354 // diagnostic aid. |
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355 |
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356 void CMRegionStack::push_with_lock(MemRegion mr) { |
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357 assert(mr.word_size() > 0, "Precondition"); |
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358 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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359 |
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360 if (isFull()) { |
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361 _overflow = true; |
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362 return; |
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363 } |
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364 |
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365 _base[_index] = mr; |
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366 _index += 1; |
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367 } |
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368 |
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369 MemRegion CMRegionStack::pop_with_lock() { |
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370 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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371 |
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372 while (true) { |
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373 if (_index == 0) { |
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374 return MemRegion(); |
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375 } |
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376 _index -= 1; |
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377 |
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378 MemRegion mr = _base[_index]; |
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379 if (mr.start() != NULL) { |
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380 assert(mr.end() != NULL, "invariant"); |
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381 assert(mr.word_size() > 0, "invariant"); |
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382 return mr; |
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383 } else { |
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384 // that entry was invalidated... let's skip it |
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385 assert(mr.end() == NULL, "invariant"); |
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386 } |
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387 } |
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388 } |
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389 #endif |
342 | 390 |
391 bool CMRegionStack::invalidate_entries_into_cset() { | |
392 bool result = false; | |
393 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
394 for (int i = 0; i < _oops_do_bound; ++i) { | |
395 MemRegion mr = _base[i]; | |
396 if (mr.start() != NULL) { | |
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397 assert(mr.end() != NULL, "invariant"); |
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398 assert(mr.word_size() > 0, "invariant"); |
342 | 399 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
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400 assert(hr != NULL, "invariant"); |
342 | 401 if (hr->in_collection_set()) { |
402 // The region points into the collection set | |
403 _base[i] = MemRegion(); | |
404 result = true; | |
405 } | |
406 } else { | |
407 // that entry was invalidated... let's skip it | |
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408 assert(mr.end() == NULL, "invariant"); |
342 | 409 } |
410 } | |
411 return result; | |
412 } | |
413 | |
414 template<class OopClosureClass> | |
415 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
416 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
417 || SafepointSynchronize::is_at_safepoint(), | |
418 "Drain recursion must be yield-safe."); | |
419 bool res = true; | |
420 debug_only(_drain_in_progress = true); | |
421 debug_only(_drain_in_progress_yields = yield_after); | |
422 while (!isEmpty()) { | |
423 oop newOop = pop(); | |
424 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
425 assert(newOop->is_oop(), "Expected an oop"); | |
426 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
427 "only grey objects on this stack"); | |
428 // iterate over the oops in this oop, marking and pushing | |
429 // the ones in CMS generation. | |
430 newOop->oop_iterate(cl); | |
431 if (yield_after && _cm->do_yield_check()) { | |
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432 res = false; |
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433 break; |
342 | 434 } |
435 } | |
436 debug_only(_drain_in_progress = false); | |
437 return res; | |
438 } | |
439 | |
440 void CMMarkStack::oops_do(OopClosure* f) { | |
441 if (_index == 0) return; | |
442 assert(_oops_do_bound != -1 && _oops_do_bound <= _index, | |
443 "Bound must be set."); | |
444 for (int i = 0; i < _oops_do_bound; i++) { | |
445 f->do_oop(&_base[i]); | |
446 } | |
447 _oops_do_bound = -1; | |
448 } | |
449 | |
450 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
451 return (_g1h->is_obj_ill(obj) | |
452 || (_g1h->is_in_permanent(obj) | |
453 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
454 } | |
455 | |
456 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
457 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
458 #endif // _MSC_VER | |
459 | |
460 ConcurrentMark::ConcurrentMark(ReservedSpace rs, | |
461 int max_regions) : | |
462 _markBitMap1(rs, MinObjAlignment - 1), | |
463 _markBitMap2(rs, MinObjAlignment - 1), | |
464 | |
465 _parallel_marking_threads(0), | |
466 _sleep_factor(0.0), | |
467 _marking_task_overhead(1.0), | |
468 _cleanup_sleep_factor(0.0), | |
469 _cleanup_task_overhead(1.0), | |
2152 | 470 _cleanup_list("Cleanup List"), |
342 | 471 _region_bm(max_regions, false /* in_resource_area*/), |
472 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
473 CardTableModRefBS::card_shift, | |
474 false /* in_resource_area*/), | |
475 _prevMarkBitMap(&_markBitMap1), | |
476 _nextMarkBitMap(&_markBitMap2), | |
477 _at_least_one_mark_complete(false), | |
478 | |
479 _markStack(this), | |
480 _regionStack(), | |
481 // _finger set in set_non_marking_state | |
482 | |
483 _max_task_num(MAX2(ParallelGCThreads, (size_t)1)), | |
484 // _active_tasks set in set_non_marking_state | |
485 // _tasks set inside the constructor | |
486 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
487 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
488 | |
489 _has_overflown(false), | |
490 _concurrent(false), | |
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491 _has_aborted(false), |
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492 _restart_for_overflow(false), |
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493 _concurrent_marking_in_progress(false), |
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494 _should_gray_objects(false), |
342 | 495 |
496 // _verbose_level set below | |
497 | |
498 _init_times(), | |
499 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
500 _cleanup_times(), | |
501 _total_counting_time(0.0), | |
502 _total_rs_scrub_time(0.0), | |
503 | |
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504 _parallel_workers(NULL) { |
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505 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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506 if (verbose_level < no_verbose) { |
342 | 507 verbose_level = no_verbose; |
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508 } |
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509 if (verbose_level > high_verbose) { |
342 | 510 verbose_level = high_verbose; |
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511 } |
342 | 512 _verbose_level = verbose_level; |
513 | |
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514 if (verbose_low()) { |
342 | 515 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
516 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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517 } |
342 | 518 |
1284 | 519 _markStack.allocate(MarkStackSize); |
751 | 520 _regionStack.allocate(G1MarkRegionStackSize); |
342 | 521 |
522 // Create & start a ConcurrentMark thread. | |
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523 _cmThread = new ConcurrentMarkThread(this); |
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524 assert(cmThread() != NULL, "CM Thread should have been created"); |
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525 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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526 |
342 | 527 _g1h = G1CollectedHeap::heap(); |
528 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
529 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
530 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
531 | |
532 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 533 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 534 |
535 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
536 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
537 | |
538 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail | |
539 _active_tasks = _max_task_num; | |
540 for (int i = 0; i < (int) _max_task_num; ++i) { | |
541 CMTaskQueue* task_queue = new CMTaskQueue(); | |
542 task_queue->initialize(); | |
543 _task_queues->register_queue(i, task_queue); | |
544 | |
545 _tasks[i] = new CMTask(i, this, task_queue, _task_queues); | |
546 _accum_task_vtime[i] = 0.0; | |
547 } | |
548 | |
1284 | 549 if (ConcGCThreads > ParallelGCThreads) { |
550 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
342 | 551 "than ParallelGCThreads."); |
552 } | |
553 if (ParallelGCThreads == 0) { | |
554 // if we are not running with any parallel GC threads we will not | |
555 // spawn any marking threads either | |
556 _parallel_marking_threads = 0; | |
557 _sleep_factor = 0.0; | |
558 _marking_task_overhead = 1.0; | |
559 } else { | |
1284 | 560 if (ConcGCThreads > 0) { |
561 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
342 | 562 // if both are set |
563 | |
1284 | 564 _parallel_marking_threads = ConcGCThreads; |
342 | 565 _sleep_factor = 0.0; |
566 _marking_task_overhead = 1.0; | |
751 | 567 } else if (G1MarkingOverheadPercent > 0) { |
342 | 568 // we will calculate the number of parallel marking threads |
569 // based on a target overhead with respect to the soft real-time | |
570 // goal | |
571 | |
751 | 572 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 573 double overall_cm_overhead = |
751 | 574 (double) MaxGCPauseMillis * marking_overhead / |
575 (double) GCPauseIntervalMillis; | |
342 | 576 double cpu_ratio = 1.0 / (double) os::processor_count(); |
577 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
578 double marking_task_overhead = | |
579 overall_cm_overhead / marking_thread_num * | |
580 (double) os::processor_count(); | |
581 double sleep_factor = | |
582 (1.0 - marking_task_overhead) / marking_task_overhead; | |
583 | |
584 _parallel_marking_threads = (size_t) marking_thread_num; | |
585 _sleep_factor = sleep_factor; | |
586 _marking_task_overhead = marking_task_overhead; | |
587 } else { | |
588 _parallel_marking_threads = MAX2((ParallelGCThreads + 2) / 4, (size_t)1); | |
589 _sleep_factor = 0.0; | |
590 _marking_task_overhead = 1.0; | |
591 } | |
592 | |
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593 if (parallel_marking_threads() > 1) { |
342 | 594 _cleanup_task_overhead = 1.0; |
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595 } else { |
342 | 596 _cleanup_task_overhead = marking_task_overhead(); |
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597 } |
342 | 598 _cleanup_sleep_factor = |
599 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
600 | |
601 #if 0 | |
602 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
603 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
604 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
605 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
606 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
607 #endif | |
608 | |
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609 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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610 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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611 (int) _parallel_marking_threads, false, true); |
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612 if (_parallel_workers == NULL) { |
342 | 613 vm_exit_during_initialization("Failed necessary allocation."); |
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614 } else { |
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615 _parallel_workers->initialize_workers(); |
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616 } |
342 | 617 } |
618 | |
619 // so that the call below can read a sensible value | |
620 _heap_start = (HeapWord*) rs.base(); | |
621 set_non_marking_state(); | |
622 } | |
623 | |
624 void ConcurrentMark::update_g1_committed(bool force) { | |
625 // If concurrent marking is not in progress, then we do not need to | |
626 // update _heap_end. This has a subtle and important | |
627 // side-effect. Imagine that two evacuation pauses happen between | |
628 // marking completion and remark. The first one can grow the | |
629 // heap (hence now the finger is below the heap end). Then, the | |
630 // second one could unnecessarily push regions on the region | |
631 // stack. This causes the invariant that the region stack is empty | |
632 // at the beginning of remark to be false. By ensuring that we do | |
633 // not observe heap expansions after marking is complete, then we do | |
634 // not have this problem. | |
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635 if (!concurrent_marking_in_progress() && !force) return; |
342 | 636 |
637 MemRegion committed = _g1h->g1_committed(); | |
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638 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 639 HeapWord* new_end = committed.end(); |
640 if (new_end > _heap_end) { | |
641 // The heap has been expanded. | |
642 | |
643 _heap_end = new_end; | |
644 } | |
645 // Notice that the heap can also shrink. However, this only happens | |
646 // during a Full GC (at least currently) and the entire marking | |
647 // phase will bail out and the task will not be restarted. So, let's | |
648 // do nothing. | |
649 } | |
650 | |
651 void ConcurrentMark::reset() { | |
652 // Starting values for these two. This should be called in a STW | |
653 // phase. CM will be notified of any future g1_committed expansions | |
654 // will be at the end of evacuation pauses, when tasks are | |
655 // inactive. | |
656 MemRegion committed = _g1h->g1_committed(); | |
657 _heap_start = committed.start(); | |
658 _heap_end = committed.end(); | |
659 | |
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660 // Separated the asserts so that we know which one fires. |
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661 assert(_heap_start != NULL, "heap bounds should look ok"); |
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662 assert(_heap_end != NULL, "heap bounds should look ok"); |
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663 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 664 |
665 // reset all the marking data structures and any necessary flags | |
666 clear_marking_state(); | |
667 | |
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668 if (verbose_low()) { |
342 | 669 gclog_or_tty->print_cr("[global] resetting"); |
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670 } |
342 | 671 |
672 // We do reset all of them, since different phases will use | |
673 // different number of active threads. So, it's easiest to have all | |
674 // of them ready. | |
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675 for (int i = 0; i < (int) _max_task_num; ++i) { |
342 | 676 _tasks[i]->reset(_nextMarkBitMap); |
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677 } |
342 | 678 |
679 // we need this to make sure that the flag is on during the evac | |
680 // pause with initial mark piggy-backed | |
681 set_concurrent_marking_in_progress(); | |
682 } | |
683 | |
684 void ConcurrentMark::set_phase(size_t active_tasks, bool concurrent) { | |
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685 assert(active_tasks <= _max_task_num, "we should not have more"); |
342 | 686 |
687 _active_tasks = active_tasks; | |
688 // Need to update the three data structures below according to the | |
689 // number of active threads for this phase. | |
690 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
691 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
692 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
693 | |
694 _concurrent = concurrent; | |
695 // We propagate this to all tasks, not just the active ones. | |
696 for (int i = 0; i < (int) _max_task_num; ++i) | |
697 _tasks[i]->set_concurrent(concurrent); | |
698 | |
699 if (concurrent) { | |
700 set_concurrent_marking_in_progress(); | |
701 } else { | |
702 // We currently assume that the concurrent flag has been set to | |
703 // false before we start remark. At this point we should also be | |
704 // in a STW phase. | |
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705 assert(!concurrent_marking_in_progress(), "invariant"); |
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706 assert(_finger == _heap_end, "only way to get here"); |
342 | 707 update_g1_committed(true); |
708 } | |
709 } | |
710 | |
711 void ConcurrentMark::set_non_marking_state() { | |
712 // We set the global marking state to some default values when we're | |
713 // not doing marking. | |
714 clear_marking_state(); | |
715 _active_tasks = 0; | |
716 clear_concurrent_marking_in_progress(); | |
717 } | |
718 | |
719 ConcurrentMark::~ConcurrentMark() { | |
720 for (int i = 0; i < (int) _max_task_num; ++i) { | |
721 delete _task_queues->queue(i); | |
722 delete _tasks[i]; | |
723 } | |
724 delete _task_queues; | |
725 FREE_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
726 } | |
727 | |
728 // This closure is used to mark refs into the g1 generation | |
729 // from external roots in the CMS bit map. | |
730 // Called at the first checkpoint. | |
731 // | |
732 | |
733 void ConcurrentMark::clearNextBitmap() { | |
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734 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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735 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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736 |
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737 // Make sure that the concurrent mark thread looks to still be in |
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738 // the current cycle. |
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739 guarantee(cmThread()->during_cycle(), "invariant"); |
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740 |
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741 // We are finishing up the current cycle by clearing the next |
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742 // marking bitmap and getting it ready for the next cycle. During |
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743 // this time no other cycle can start. So, let's make sure that this |
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744 // is the case. |
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745 guarantee(!g1h->mark_in_progress(), "invariant"); |
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746 |
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747 // clear the mark bitmap (no grey objects to start with). |
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748 // We need to do this in chunks and offer to yield in between |
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749 // each chunk. |
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750 HeapWord* start = _nextMarkBitMap->startWord(); |
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751 HeapWord* end = _nextMarkBitMap->endWord(); |
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752 HeapWord* cur = start; |
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753 size_t chunkSize = M; |
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754 while (cur < end) { |
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755 HeapWord* next = cur + chunkSize; |
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756 if (next > end) { |
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757 next = end; |
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758 } |
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759 MemRegion mr(cur,next); |
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760 _nextMarkBitMap->clearRange(mr); |
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761 cur = next; |
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762 do_yield_check(); |
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763 |
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764 // Repeat the asserts from above. We'll do them as asserts here to |
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765 // minimize their overhead on the product. However, we'll have |
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766 // them as guarantees at the beginning / end of the bitmap |
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767 // clearing to get some checking in the product. |
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768 assert(cmThread()->during_cycle(), "invariant"); |
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769 assert(!g1h->mark_in_progress(), "invariant"); |
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770 } |
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771 |
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772 // Repeat the asserts from above. |
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773 guarantee(cmThread()->during_cycle(), "invariant"); |
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774 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 775 } |
776 | |
777 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
778 public: | |
779 bool doHeapRegion(HeapRegion* r) { | |
780 if (!r->continuesHumongous()) { | |
781 r->note_start_of_marking(true); | |
782 } | |
783 return false; | |
784 } | |
785 }; | |
786 | |
787 void ConcurrentMark::checkpointRootsInitialPre() { | |
788 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
789 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
790 | |
791 _has_aborted = false; | |
792 | |
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793 #ifndef PRODUCT |
1044 | 794 if (G1PrintReachableAtInitialMark) { |
1388 | 795 print_reachable("at-cycle-start", |
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796 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 797 } |
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798 #endif |
342 | 799 |
800 // Initialise marking structures. This has to be done in a STW phase. | |
801 reset(); | |
802 } | |
803 | |
804 class CMMarkRootsClosure: public OopsInGenClosure { | |
805 private: | |
806 ConcurrentMark* _cm; | |
807 G1CollectedHeap* _g1h; | |
808 bool _do_barrier; | |
809 | |
810 public: | |
811 CMMarkRootsClosure(ConcurrentMark* cm, | |
812 G1CollectedHeap* g1h, | |
813 bool do_barrier) : _cm(cm), _g1h(g1h), | |
814 _do_barrier(do_barrier) { } | |
815 | |
845
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816 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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817 virtual void do_oop( oop* p) { do_oop_work(p); } |
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818 |
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819 template <class T> void do_oop_work(T* p) { |
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820 T heap_oop = oopDesc::load_heap_oop(p); |
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821 if (!oopDesc::is_null(heap_oop)) { |
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822 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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823 assert(obj->is_oop() || obj->mark() == NULL, |
342 | 824 "expected an oop, possibly with mark word displaced"); |
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825 HeapWord* addr = (HeapWord*)obj; |
342 | 826 if (_g1h->is_in_g1_reserved(addr)) { |
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827 _cm->grayRoot(obj); |
342 | 828 } |
829 } | |
830 if (_do_barrier) { | |
831 assert(!_g1h->is_in_g1_reserved(p), | |
832 "Should be called on external roots"); | |
833 do_barrier(p); | |
834 } | |
835 } | |
836 }; | |
837 | |
838 void ConcurrentMark::checkpointRootsInitialPost() { | |
839 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
840 | |
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841 // If we force an overflow during remark, the remark operation will |
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842 // actually abort and we'll restart concurrent marking. If we always |
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843 // force an oveflow during remark we'll never actually complete the |
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844 // marking phase. So, we initilize this here, at the start of the |
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845 // cycle, so that at the remaining overflow number will decrease at |
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846 // every remark and we'll eventually not need to cause one. |
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847 force_overflow_stw()->init(); |
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848 |
342 | 849 // For each region note start of marking. |
850 NoteStartOfMarkHRClosure startcl; | |
851 g1h->heap_region_iterate(&startcl); | |
852 | |
853 // Start weak-reference discovery. | |
854 ReferenceProcessor* rp = g1h->ref_processor(); | |
855 rp->verify_no_references_recorded(); | |
856 rp->enable_discovery(); // enable ("weak") refs discovery | |
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857 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 858 |
859 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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860 // This is the start of the marking cycle, we're expected all |
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861 // threads to have SATB queues with active set to false. |
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862 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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863 false /* expected_active */); |
342 | 864 |
865 // update_g1_committed() will be called at the end of an evac pause | |
866 // when marking is on. So, it's also called at the end of the | |
867 // initial-mark pause to update the heap end, if the heap expands | |
868 // during it. No need to call it here. | |
869 } | |
870 | |
871 // Checkpoint the roots into this generation from outside | |
872 // this generation. [Note this initial checkpoint need only | |
873 // be approximate -- we'll do a catch up phase subsequently.] | |
874 void ConcurrentMark::checkpointRootsInitial() { | |
875 assert(SafepointSynchronize::is_at_safepoint(), "world should be stopped"); | |
876 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
877 | |
878 double start = os::elapsedTime(); | |
879 | |
880 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); | |
881 g1p->record_concurrent_mark_init_start(); | |
882 checkpointRootsInitialPre(); | |
883 | |
884 // YSR: when concurrent precleaning is in place, we'll | |
885 // need to clear the cached card table here | |
886 | |
887 ResourceMark rm; | |
888 HandleMark hm; | |
889 | |
890 g1h->ensure_parsability(false); | |
891 g1h->perm_gen()->save_marks(); | |
892 | |
893 CMMarkRootsClosure notOlder(this, g1h, false); | |
894 CMMarkRootsClosure older(this, g1h, true); | |
895 | |
896 g1h->set_marking_started(); | |
897 g1h->rem_set()->prepare_for_younger_refs_iterate(false); | |
898 | |
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899 g1h->process_strong_roots(true, // activate StrongRootsScope |
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900 false, // fake perm gen collection |
342 | 901 SharedHeap::SO_AllClasses, |
902 ¬Older, // Regular roots | |
989
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903 NULL, // do not visit active blobs |
342 | 904 &older // Perm Gen Roots |
905 ); | |
906 checkpointRootsInitialPost(); | |
907 | |
908 // Statistics. | |
909 double end = os::elapsedTime(); | |
910 _init_times.add((end - start) * 1000.0); | |
911 | |
912 g1p->record_concurrent_mark_init_end(); | |
913 } | |
914 | |
915 /* | |
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916 * Notice that in the next two methods, we actually leave the STS |
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917 * during the barrier sync and join it immediately afterwards. If we |
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918 * do not do this, the following deadlock can occur: one thread could |
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919 * be in the barrier sync code, waiting for the other thread to also |
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920 * sync up, whereas another one could be trying to yield, while also |
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921 * waiting for the other threads to sync up too. |
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922 * |
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923 * Note, however, that this code is also used during remark and in |
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924 * this case we should not attempt to leave / enter the STS, otherwise |
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925 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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926 * (product). So we should only leave / enter the STS if we are |
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927 * operating concurrently. |
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928 * |
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929 * Because the thread that does the sync barrier has left the STS, it |
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930 * is possible to be suspended for a Full GC or an evacuation pause |
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931 * could occur. This is actually safe, since the entering the sync |
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932 * barrier is one of the last things do_marking_step() does, and it |
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933 * doesn't manipulate any data structures afterwards. |
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934 */ |
342 | 935 |
936 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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937 if (verbose_low()) { |
342 | 938 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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939 } |
342 | 940 |
3316
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941 if (concurrent()) { |
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942 ConcurrentGCThread::stsLeave(); |
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943 } |
342 | 944 _first_overflow_barrier_sync.enter(); |
3316
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945 if (concurrent()) { |
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946 ConcurrentGCThread::stsJoin(); |
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947 } |
342 | 948 // at this point everyone should have synced up and not be doing any |
949 // more work | |
950 | |
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951 if (verbose_low()) { |
342 | 952 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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953 } |
342 | 954 |
955 // let task 0 do this | |
956 if (task_num == 0) { | |
957 // task 0 is responsible for clearing the global data structures | |
3316
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958 // We should be here because of an overflow. During STW we should |
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959 // not clear the overflow flag since we rely on it being true when |
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960 // we exit this method to abort the pause and restart concurent |
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961 // marking. |
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962 clear_marking_state(concurrent() /* clear_overflow */); |
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963 force_overflow()->update(); |
342 | 964 |
965 if (PrintGC) { | |
966 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
967 gclog_or_tty->stamp(PrintGCTimeStamps); | |
968 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
969 } | |
970 } | |
971 | |
972 // after this, each task should reset its own data structures then | |
973 // then go into the second barrier | |
974 } | |
975 | |
976 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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977 if (verbose_low()) { |
342 | 978 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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979 } |
342 | 980 |
3316
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981 if (concurrent()) { |
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982 ConcurrentGCThread::stsLeave(); |
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983 } |
342 | 984 _second_overflow_barrier_sync.enter(); |
3316
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985 if (concurrent()) { |
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986 ConcurrentGCThread::stsJoin(); |
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987 } |
342 | 988 // at this point everything should be re-initialised and ready to go |
989 | |
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990 if (verbose_low()) { |
342 | 991 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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992 } |
342 | 993 } |
994 | |
3316
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995 #ifndef PRODUCT |
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996 void ForceOverflowSettings::init() { |
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997 _num_remaining = G1ConcMarkForceOverflow; |
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998 _force = false; |
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999 update(); |
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1000 } |
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1001 |
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1002 void ForceOverflowSettings::update() { |
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1003 if (_num_remaining > 0) { |
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1004 _num_remaining -= 1; |
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1005 _force = true; |
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1006 } else { |
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1007 _force = false; |
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1008 } |
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1009 } |
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1010 |
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1011 bool ForceOverflowSettings::should_force() { |
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1012 if (_force) { |
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1013 _force = false; |
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1014 return true; |
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1015 } else { |
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1016 return false; |
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1017 } |
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1018 } |
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1019 #endif // !PRODUCT |
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1020 |
342 | 1021 void ConcurrentMark::grayRoot(oop p) { |
1022 HeapWord* addr = (HeapWord*) p; | |
1023 // We can't really check against _heap_start and _heap_end, since it | |
1024 // is possible during an evacuation pause with piggy-backed | |
1025 // initial-mark that the committed space is expanded during the | |
1026 // pause without CM observing this change. So the assertions below | |
1027 // is a bit conservative; but better than nothing. | |
1023
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1028 assert(_g1h->g1_committed().contains(addr), |
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1029 "address should be within the heap bounds"); |
342 | 1030 |
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1031 if (!_nextMarkBitMap->isMarked(addr)) { |
342 | 1032 _nextMarkBitMap->parMark(addr); |
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1033 } |
342 | 1034 } |
1035 | |
1036 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { | |
1037 // The objects on the region have already been marked "in bulk" by | |
1038 // the caller. We only need to decide whether to push the region on | |
1039 // the region stack or not. | |
1040 | |
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1041 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
342 | 1042 // We're done with marking and waiting for remark. We do not need to |
1043 // push anything else on the region stack. | |
1044 return; | |
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1045 } |
342 | 1046 |
1047 HeapWord* finger = _finger; | |
1048 | |
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1049 if (verbose_low()) { |
342 | 1050 gclog_or_tty->print_cr("[global] attempting to push " |
1051 "region ["PTR_FORMAT", "PTR_FORMAT"), finger is at " | |
1052 PTR_FORMAT, mr.start(), mr.end(), finger); | |
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1053 } |
342 | 1054 |
1055 if (mr.start() < finger) { | |
1056 // The finger is always heap region aligned and it is not possible | |
1057 // for mr to span heap regions. | |
1023
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1058 assert(mr.end() <= finger, "invariant"); |
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1059 |
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1060 // Separated the asserts so that we know which one fires. |
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1061 assert(mr.start() <= mr.end(), |
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1062 "region boundaries should fall within the committed space"); |
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1063 assert(_heap_start <= mr.start(), |
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1064 "region boundaries should fall within the committed space"); |
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1065 assert(mr.end() <= _heap_end, |
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1066 "region boundaries should fall within the committed space"); |
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1067 if (verbose_low()) { |
342 | 1068 gclog_or_tty->print_cr("[global] region ["PTR_FORMAT", "PTR_FORMAT") " |
1069 "below the finger, pushing it", | |
1070 mr.start(), mr.end()); | |
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1071 } |
342 | 1072 |
1835
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1073 if (!region_stack_push_lock_free(mr)) { |
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1074 if (verbose_low()) { |
342 | 1075 gclog_or_tty->print_cr("[global] region stack has overflown."); |
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1076 } |
342 | 1077 } |
1078 } | |
1079 } | |
1080 | |
1081 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
1082 // The object is not marked by the caller. We need to at least mark | |
1083 // it and maybe push in on the stack. | |
1084 | |
1085 HeapWord* addr = (HeapWord*)p; | |
1086 if (!_nextMarkBitMap->isMarked(addr)) { | |
1087 // We definitely need to mark it, irrespective whether we bail out | |
1088 // because we're done with marking. | |
1089 if (_nextMarkBitMap->parMark(addr)) { | |
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1090 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
342 | 1091 // If we're done with concurrent marking and we're waiting for |
1092 // remark, then we're not pushing anything on the stack. | |
1093 return; | |
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1094 } |
342 | 1095 |
1096 // No OrderAccess:store_load() is needed. It is implicit in the | |
1097 // CAS done in parMark(addr) above | |
1098 HeapWord* finger = _finger; | |
1099 | |
1100 if (addr < finger) { | |
1101 if (!mark_stack_push(oop(addr))) { | |
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1102 if (verbose_low()) { |
342 | 1103 gclog_or_tty->print_cr("[global] global stack overflow " |
1104 "during parMark"); | |
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1105 } |
342 | 1106 } |
1107 } | |
1108 } | |
1109 } | |
1110 } | |
1111 | |
1112 class CMConcurrentMarkingTask: public AbstractGangTask { | |
1113 private: | |
1114 ConcurrentMark* _cm; | |
1115 ConcurrentMarkThread* _cmt; | |
1116 | |
1117 public: | |
1118 void work(int worker_i) { | |
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1119 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1120 "this should only be done by a conc GC thread"); |
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1121 ResourceMark rm; |
342 | 1122 |
1123 double start_vtime = os::elapsedVTime(); | |
1124 | |
1125 ConcurrentGCThread::stsJoin(); | |
1126 | |
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1127 assert((size_t) worker_i < _cm->active_tasks(), "invariant"); |
342 | 1128 CMTask* the_task = _cm->task(worker_i); |
1129 the_task->record_start_time(); | |
1130 if (!_cm->has_aborted()) { | |
1131 do { | |
1132 double start_vtime_sec = os::elapsedVTime(); | |
1133 double start_time_sec = os::elapsedTime(); | |
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1134 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1135 |
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1136 the_task->do_marking_step(mark_step_duration_ms, |
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1137 true /* do_stealing */, |
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1138 true /* do_termination */); |
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1139 |
342 | 1140 double end_time_sec = os::elapsedTime(); |
1141 double end_vtime_sec = os::elapsedVTime(); | |
1142 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1143 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1144 _cm->clear_has_overflown(); | |
1145 | |
1146 bool ret = _cm->do_yield_check(worker_i); | |
1147 | |
1148 jlong sleep_time_ms; | |
1149 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1150 sleep_time_ms = | |
1151 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1152 ConcurrentGCThread::stsLeave(); | |
1153 os::sleep(Thread::current(), sleep_time_ms, false); | |
1154 ConcurrentGCThread::stsJoin(); | |
1155 } | |
1156 double end_time2_sec = os::elapsedTime(); | |
1157 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1158 | |
1159 #if 0 | |
1160 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1161 "overhead %1.4lf", | |
1162 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1163 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1164 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1165 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1166 #endif | |
1167 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1168 } | |
1169 the_task->record_end_time(); | |
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1170 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1171 |
1172 ConcurrentGCThread::stsLeave(); | |
1173 | |
1174 double end_vtime = os::elapsedVTime(); | |
1175 _cm->update_accum_task_vtime(worker_i, end_vtime - start_vtime); | |
1176 } | |
1177 | |
1178 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1179 ConcurrentMarkThread* cmt) : | |
1180 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1181 | |
1182 ~CMConcurrentMarkingTask() { } | |
1183 }; | |
1184 | |
1185 void ConcurrentMark::markFromRoots() { | |
1186 // we might be tempted to assert that: | |
1187 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1188 // "inconsistent argument?"); | |
1189 // However that wouldn't be right, because it's possible that | |
1190 // a safepoint is indeed in progress as a younger generation | |
1191 // stop-the-world GC happens even as we mark in this generation. | |
1192 | |
1193 _restart_for_overflow = false; | |
1194 | |
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1195 size_t active_workers = MAX2((size_t) 1, parallel_marking_threads()); |
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1196 force_overflow_conc()->init(); |
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1197 set_phase(active_workers, true /* concurrent */); |
342 | 1198 |
1199 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1200 if (parallel_marking_threads() > 0) { |
342 | 1201 _parallel_workers->run_task(&markingTask); |
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1202 } else { |
342 | 1203 markingTask.work(0); |
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1204 } |
342 | 1205 print_stats(); |
1206 } | |
1207 | |
1208 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1209 // world is stopped at this checkpoint | |
1210 assert(SafepointSynchronize::is_at_safepoint(), | |
1211 "world should be stopped"); | |
1212 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1213 | |
1214 // If a full collection has happened, we shouldn't do this. | |
1215 if (has_aborted()) { | |
1216 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1217 return; | |
1218 } | |
1219 | |
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1220 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1221 |
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1222 if (VerifyDuringGC) { |
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1223 HandleMark hm; // handle scope |
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1224 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1225 Universe::heap()->prepare_for_verify(); |
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1226 Universe::verify(/* allow dirty */ true, |
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1227 /* silent */ false, |
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1228 /* option */ VerifyOption_G1UsePrevMarking); |
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1229 } |
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1230 |
342 | 1231 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1232 g1p->record_concurrent_mark_remark_start(); | |
1233 | |
1234 double start = os::elapsedTime(); | |
1235 | |
1236 checkpointRootsFinalWork(); | |
1237 | |
1238 double mark_work_end = os::elapsedTime(); | |
1239 | |
1240 weakRefsWork(clear_all_soft_refs); | |
1241 | |
1242 if (has_overflown()) { | |
1243 // Oops. We overflowed. Restart concurrent marking. | |
1244 _restart_for_overflow = true; | |
1245 // Clear the flag. We do not need it any more. | |
1246 clear_has_overflown(); | |
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1247 if (G1TraceMarkStackOverflow) { |
342 | 1248 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1249 } |
342 | 1250 } else { |
2149 | 1251 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1252 // We're done with marking. |
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1253 // This is the end of the marking cycle, we're expected all |
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1254 // threads to have SATB queues with active set to true. |
2149 | 1255 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1256 true /* expected_active */); | |
811 | 1257 |
1258 if (VerifyDuringGC) { | |
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1259 HandleMark hm; // handle scope |
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1260 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1261 Universe::heap()->prepare_for_verify(); |
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1262 Universe::verify(/* allow dirty */ true, |
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1263 /* silent */ false, |
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1264 /* option */ VerifyOption_G1UseNextMarking); |
811 | 1265 } |
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1266 assert(!restart_for_overflow(), "sanity"); |
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1267 } |
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1268 |
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1269 // Reset the marking state if marking completed |
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1270 if (!restart_for_overflow()) { |
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1271 set_non_marking_state(); |
342 | 1272 } |
1273 | |
1274 #if VERIFY_OBJS_PROCESSED | |
1275 _scan_obj_cl.objs_processed = 0; | |
1276 ThreadLocalObjQueue::objs_enqueued = 0; | |
1277 #endif | |
1278 | |
1279 // Statistics | |
1280 double now = os::elapsedTime(); | |
1281 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1282 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1283 _remark_times.add((now - start) * 1000.0); | |
1284 | |
1285 g1p->record_concurrent_mark_remark_end(); | |
1286 } | |
1287 | |
1288 #define CARD_BM_TEST_MODE 0 | |
1289 | |
1290 class CalcLiveObjectsClosure: public HeapRegionClosure { | |
1291 | |
1292 CMBitMapRO* _bm; | |
1293 ConcurrentMark* _cm; | |
1294 bool _changed; | |
1295 bool _yield; | |
1296 size_t _words_done; | |
1297 size_t _tot_live; | |
1298 size_t _tot_used; | |
1299 size_t _regions_done; | |
1300 double _start_vtime_sec; | |
1301 | |
1302 BitMap* _region_bm; | |
1303 BitMap* _card_bm; | |
1304 intptr_t _bottom_card_num; | |
1305 bool _final; | |
1306 | |
1307 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
1308 for (intptr_t i = start_card_num; i <= last_card_num; i++) { | |
1309 #if CARD_BM_TEST_MODE | |
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1310 guarantee(_card_bm->at(i - _bottom_card_num), "Should already be set."); |
342 | 1311 #else |
1312 _card_bm->par_at_put(i - _bottom_card_num, 1); | |
1313 #endif | |
1314 } | |
1315 } | |
1316 | |
1317 public: | |
1318 CalcLiveObjectsClosure(bool final, | |
1319 CMBitMapRO *bm, ConcurrentMark *cm, | |
936 | 1320 BitMap* region_bm, BitMap* card_bm) : |
342 | 1321 _bm(bm), _cm(cm), _changed(false), _yield(true), |
1322 _words_done(0), _tot_live(0), _tot_used(0), | |
936 | 1323 _region_bm(region_bm), _card_bm(card_bm),_final(final), |
342 | 1324 _regions_done(0), _start_vtime_sec(0.0) |
1325 { | |
1326 _bottom_card_num = | |
1327 intptr_t(uintptr_t(G1CollectedHeap::heap()->reserved_region().start()) >> | |
1328 CardTableModRefBS::card_shift); | |
1329 } | |
1330 | |
829 | 1331 // It takes a region that's not empty (i.e., it has at least one |
1332 // live object in it and sets its corresponding bit on the region | |
1333 // bitmap to 1. If the region is "starts humongous" it will also set | |
1334 // to 1 the bits on the region bitmap that correspond to its | |
1335 // associated "continues humongous" regions. | |
1336 void set_bit_for_region(HeapRegion* hr) { | |
1337 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1338 | |
1339 size_t index = hr->hrs_index(); | |
1340 if (!hr->startsHumongous()) { | |
1341 // Normal (non-humongous) case: just set the bit. | |
1342 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
1343 } else { | |
1344 // Starts humongous case: calculate how many regions are part of | |
1345 // this humongous region and then set the bit range. It might | |
1346 // have been a bit more efficient to look at the object that | |
1347 // spans these humongous regions to calculate their number from | |
1348 // the object's size. However, it's a good idea to calculate | |
1349 // this based on the metadata itself, and not the region | |
1350 // contents, so that this code is not aware of what goes into | |
1351 // the humongous regions (in case this changes in the future). | |
1352 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1353 size_t end_index = index + 1; | |
831 | 1354 while (end_index < g1h->n_regions()) { |
1355 HeapRegion* chr = g1h->region_at(end_index); | |
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1356 if (!chr->continuesHumongous()) break; |
829 | 1357 end_index += 1; |
1358 } | |
1359 _region_bm->par_at_put_range((BitMap::idx_t) index, | |
1360 (BitMap::idx_t) end_index, true); | |
1361 } | |
1362 } | |
1363 | |
342 | 1364 bool doHeapRegion(HeapRegion* hr) { |
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1365 if (!_final && _regions_done == 0) { |
342 | 1366 _start_vtime_sec = os::elapsedVTime(); |
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1367 } |
342 | 1368 |
639 | 1369 if (hr->continuesHumongous()) { |
829 | 1370 // We will ignore these here and process them when their |
1371 // associated "starts humongous" region is processed (see | |
1372 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1373 // associated "starts humongous" region to have their bit set to | |
1374 // 1 since, due to the region chunking in the parallel region | |
1375 // iteration, a "continues humongous" region might be visited | |
1376 // before its associated "starts humongous". | |
639 | 1377 return false; |
1378 } | |
342 | 1379 |
1380 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
1381 HeapWord* start = hr->top_at_conc_mark_count(); | |
1382 assert(hr->bottom() <= start && start <= hr->end() && | |
1383 hr->bottom() <= nextTop && nextTop <= hr->end() && | |
1384 start <= nextTop, | |
1385 "Preconditions."); | |
1386 // Otherwise, record the number of word's we'll examine. | |
1387 size_t words_done = (nextTop - start); | |
1388 // Find the first marked object at or after "start". | |
1389 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
1390 size_t marked_bytes = 0; | |
1391 | |
1392 // Below, the term "card num" means the result of shifting an address | |
1393 // by the card shift -- address 0 corresponds to card number 0. One | |
1394 // must subtract the card num of the bottom of the heap to obtain a | |
1395 // card table index. | |
1396 // The first card num of the sequence of live cards currently being | |
1397 // constructed. -1 ==> no sequence. | |
1398 intptr_t start_card_num = -1; | |
1399 // The last card num of the sequence of live cards currently being | |
1400 // constructed. -1 ==> no sequence. | |
1401 intptr_t last_card_num = -1; | |
1402 | |
1403 while (start < nextTop) { | |
1404 if (_yield && _cm->do_yield_check()) { | |
1405 // We yielded. It might be for a full collection, in which case | |
1406 // all bets are off; terminate the traversal. | |
1407 if (_cm->has_aborted()) { | |
1408 _changed = false; | |
1409 return true; | |
1410 } else { | |
1411 // Otherwise, it might be a collection pause, and the region | |
1412 // we're looking at might be in the collection set. We'll | |
1413 // abandon this region. | |
1414 return false; | |
1415 } | |
1416 } | |
1417 oop obj = oop(start); | |
1418 int obj_sz = obj->size(); | |
1419 // The card num of the start of the current object. | |
1420 intptr_t obj_card_num = | |
1421 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
1422 | |
1423 HeapWord* obj_last = start + obj_sz - 1; | |
1424 intptr_t obj_last_card_num = | |
1425 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
1426 | |
1427 if (obj_card_num != last_card_num) { | |
1428 if (start_card_num == -1) { | |
1429 assert(last_card_num == -1, "Both or neither."); | |
1430 start_card_num = obj_card_num; | |
1431 } else { | |
1432 assert(last_card_num != -1, "Both or neither."); | |
1433 assert(obj_card_num >= last_card_num, "Inv"); | |
1434 if ((obj_card_num - last_card_num) > 1) { | |
1435 // Mark the last run, and start a new one. | |
1436 mark_card_num_range(start_card_num, last_card_num); | |
1437 start_card_num = obj_card_num; | |
1438 } | |
1439 } | |
1440 #if CARD_BM_TEST_MODE | |
1441 /* | |
1442 gclog_or_tty->print_cr("Setting bits from %d/%d.", | |
1443 obj_card_num - _bottom_card_num, | |
1444 obj_last_card_num - _bottom_card_num); | |
1445 */ | |
1446 for (intptr_t j = obj_card_num; j <= obj_last_card_num; j++) { | |
1447 _card_bm->par_at_put(j - _bottom_card_num, 1); | |
1448 } | |
1449 #endif | |
1450 } | |
1451 // In any case, we set the last card num. | |
1452 last_card_num = obj_last_card_num; | |
1453 | |
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1454 marked_bytes += (size_t)obj_sz * HeapWordSize; |
342 | 1455 // Find the next marked object after this one. |
1456 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
1457 _changed = true; | |
1458 } | |
1459 // Handle the last range, if any. | |
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1460 if (start_card_num != -1) { |
342 | 1461 mark_card_num_range(start_card_num, last_card_num); |
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1462 } |
342 | 1463 if (_final) { |
1464 // Mark the allocated-since-marking portion... | |
1465 HeapWord* tp = hr->top(); | |
1466 if (nextTop < tp) { | |
1467 start_card_num = | |
1468 intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); | |
1469 last_card_num = | |
1470 intptr_t(uintptr_t(tp) >> CardTableModRefBS::card_shift); | |
1471 mark_card_num_range(start_card_num, last_card_num); | |
1472 // This definitely means the region has live objects. | |
829 | 1473 set_bit_for_region(hr); |
342 | 1474 } |
1475 } | |
1476 | |
1477 hr->add_to_marked_bytes(marked_bytes); | |
1478 // Update the live region bitmap. | |
1479 if (marked_bytes > 0) { | |
829 | 1480 set_bit_for_region(hr); |
342 | 1481 } |
1482 hr->set_top_at_conc_mark_count(nextTop); | |
1483 _tot_live += hr->next_live_bytes(); | |
1484 _tot_used += hr->used(); | |
1485 _words_done = words_done; | |
1486 | |
1487 if (!_final) { | |
1488 ++_regions_done; | |
1489 if (_regions_done % 10 == 0) { | |
1490 double end_vtime_sec = os::elapsedVTime(); | |
1491 double elapsed_vtime_sec = end_vtime_sec - _start_vtime_sec; | |
1492 if (elapsed_vtime_sec > (10.0 / 1000.0)) { | |
1493 jlong sleep_time_ms = | |
1494 (jlong) (elapsed_vtime_sec * _cm->cleanup_sleep_factor() * 1000.0); | |
1495 os::sleep(Thread::current(), sleep_time_ms, false); | |
1496 _start_vtime_sec = end_vtime_sec; | |
1497 } | |
1498 } | |
1499 } | |
1500 | |
1501 return false; | |
1502 } | |
1503 | |
1504 bool changed() { return _changed; } | |
1505 void reset() { _changed = false; _words_done = 0; } | |
1506 void no_yield() { _yield = false; } | |
1507 size_t words_done() { return _words_done; } | |
1508 size_t tot_live() { return _tot_live; } | |
1509 size_t tot_used() { return _tot_used; } | |
1510 }; | |
1511 | |
1512 | |
1513 void ConcurrentMark::calcDesiredRegions() { | |
1514 _region_bm.clear(); | |
1515 _card_bm.clear(); | |
1516 CalcLiveObjectsClosure calccl(false /*final*/, | |
1517 nextMarkBitMap(), this, | |
936 | 1518 &_region_bm, &_card_bm); |
342 | 1519 G1CollectedHeap *g1h = G1CollectedHeap::heap(); |
1520 g1h->heap_region_iterate(&calccl); | |
1521 | |
1522 do { | |
1523 calccl.reset(); | |
1524 g1h->heap_region_iterate(&calccl); | |
1525 } while (calccl.changed()); | |
1526 } | |
1527 | |
1528 class G1ParFinalCountTask: public AbstractGangTask { | |
1529 protected: | |
1530 G1CollectedHeap* _g1h; | |
1531 CMBitMap* _bm; | |
1532 size_t _n_workers; | |
1533 size_t *_live_bytes; | |
1534 size_t *_used_bytes; | |
1535 BitMap* _region_bm; | |
1536 BitMap* _card_bm; | |
1537 public: | |
1538 G1ParFinalCountTask(G1CollectedHeap* g1h, CMBitMap* bm, | |
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1539 BitMap* region_bm, BitMap* card_bm) |
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1540 : AbstractGangTask("G1 final counting"), _g1h(g1h), |
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1541 _bm(bm), _region_bm(region_bm), _card_bm(card_bm) { |
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1542 if (ParallelGCThreads > 0) { |
342 | 1543 _n_workers = _g1h->workers()->total_workers(); |
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1544 } else { |
342 | 1545 _n_workers = 1; |
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1546 } |
342 | 1547 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); |
1548 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
1549 } | |
1550 | |
1551 ~G1ParFinalCountTask() { | |
1552 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
1553 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
1554 } | |
1555 | |
1556 void work(int i) { | |
1557 CalcLiveObjectsClosure calccl(true /*final*/, | |
1558 _bm, _g1h->concurrent_mark(), | |
936 | 1559 _region_bm, _card_bm); |
342 | 1560 calccl.no_yield(); |
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1561 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1562 _g1h->heap_region_par_iterate_chunked(&calccl, i, |
1563 HeapRegion::FinalCountClaimValue); | |
342 | 1564 } else { |
1565 _g1h->heap_region_iterate(&calccl); | |
1566 } | |
1567 assert(calccl.complete(), "Shouldn't have yielded!"); | |
1568 | |
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1569 assert((size_t) i < _n_workers, "invariant"); |
342 | 1570 _live_bytes[i] = calccl.tot_live(); |
1571 _used_bytes[i] = calccl.tot_used(); | |
1572 } | |
1573 size_t live_bytes() { | |
1574 size_t live_bytes = 0; | |
1575 for (size_t i = 0; i < _n_workers; ++i) | |
1576 live_bytes += _live_bytes[i]; | |
1577 return live_bytes; | |
1578 } | |
1579 size_t used_bytes() { | |
1580 size_t used_bytes = 0; | |
1581 for (size_t i = 0; i < _n_workers; ++i) | |
1582 used_bytes += _used_bytes[i]; | |
1583 return used_bytes; | |
1584 } | |
1585 }; | |
1586 | |
1587 class G1ParNoteEndTask; | |
1588 | |
1589 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1590 G1CollectedHeap* _g1; | |
1591 int _worker_num; | |
1592 size_t _max_live_bytes; | |
1593 size_t _regions_claimed; | |
1594 size_t _freed_bytes; | |
2173 | 1595 FreeRegionList* _local_cleanup_list; |
1596 HumongousRegionSet* _humongous_proxy_set; | |
1597 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1598 double _claimed_region_time; |
1599 double _max_region_time; | |
1600 | |
1601 public: | |
1602 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1603 int worker_num, |
1604 FreeRegionList* local_cleanup_list, | |
1605 HumongousRegionSet* humongous_proxy_set, | |
1606 HRRSCleanupTask* hrrs_cleanup_task); | |
342 | 1607 size_t freed_bytes() { return _freed_bytes; } |
1608 | |
1609 bool doHeapRegion(HeapRegion *r); | |
1610 | |
1611 size_t max_live_bytes() { return _max_live_bytes; } | |
1612 size_t regions_claimed() { return _regions_claimed; } | |
1613 double claimed_region_time_sec() { return _claimed_region_time; } | |
1614 double max_region_time_sec() { return _max_region_time; } | |
1615 }; | |
1616 | |
1617 class G1ParNoteEndTask: public AbstractGangTask { | |
1618 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1619 |
342 | 1620 protected: |
1621 G1CollectedHeap* _g1h; | |
1622 size_t _max_live_bytes; | |
1623 size_t _freed_bytes; | |
2152 | 1624 FreeRegionList* _cleanup_list; |
1625 | |
342 | 1626 public: |
1627 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1628 FreeRegionList* cleanup_list) : |
342 | 1629 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1630 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1631 |
1632 void work(int i) { | |
1633 double start = os::elapsedTime(); | |
2173 | 1634 FreeRegionList local_cleanup_list("Local Cleanup List"); |
1635 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); | |
1636 HRRSCleanupTask hrrs_cleanup_task; | |
1637 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, i, &local_cleanup_list, | |
1638 &humongous_proxy_set, | |
1639 &hrrs_cleanup_task); | |
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1640 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1641 _g1h->heap_region_par_iterate_chunked(&g1_note_end, i, |
1642 HeapRegion::NoteEndClaimValue); | |
342 | 1643 } else { |
1644 _g1h->heap_region_iterate(&g1_note_end); | |
1645 } | |
1646 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1647 | |
2152 | 1648 // Now update the lists |
1649 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1650 NULL /* free_list */, | |
2173 | 1651 &humongous_proxy_set, |
2152 | 1652 true /* par */); |
342 | 1653 { |
1654 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1655 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1656 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1657 |
2173 | 1658 _cleanup_list->add_as_tail(&local_cleanup_list); |
1659 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1660 | |
1661 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1662 } |
1663 double end = os::elapsedTime(); | |
1664 if (G1PrintParCleanupStats) { | |
1665 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
1666 "claimed %d regions (tot = %8.3f ms, max = %8.3f ms).\n", | |
1667 i, start, end, (end-start)*1000.0, | |
1668 g1_note_end.regions_claimed(), | |
1669 g1_note_end.claimed_region_time_sec()*1000.0, | |
1670 g1_note_end.max_region_time_sec()*1000.0); | |
1671 } | |
1672 } | |
1673 size_t max_live_bytes() { return _max_live_bytes; } | |
1674 size_t freed_bytes() { return _freed_bytes; } | |
1675 }; | |
1676 | |
1677 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1678 protected: | |
1679 G1RemSet* _g1rs; | |
1680 BitMap* _region_bm; | |
1681 BitMap* _card_bm; | |
1682 public: | |
1683 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1684 BitMap* region_bm, BitMap* card_bm) : | |
1685 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
1686 _region_bm(region_bm), _card_bm(card_bm) | |
1687 {} | |
1688 | |
1689 void work(int i) { | |
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1690 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1691 _g1rs->scrub_par(_region_bm, _card_bm, i, |
1692 HeapRegion::ScrubRemSetClaimValue); | |
342 | 1693 } else { |
1694 _g1rs->scrub(_region_bm, _card_bm); | |
1695 } | |
1696 } | |
1697 | |
1698 }; | |
1699 | |
1700 G1NoteEndOfConcMarkClosure:: | |
1701 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1702 int worker_num, |
1703 FreeRegionList* local_cleanup_list, | |
1704 HumongousRegionSet* humongous_proxy_set, | |
1705 HRRSCleanupTask* hrrs_cleanup_task) | |
342 | 1706 : _g1(g1), _worker_num(worker_num), |
1707 _max_live_bytes(0), _regions_claimed(0), | |
2152 | 1708 _freed_bytes(0), |
342 | 1709 _claimed_region_time(0.0), _max_region_time(0.0), |
2173 | 1710 _local_cleanup_list(local_cleanup_list), |
1711 _humongous_proxy_set(humongous_proxy_set), | |
1712 _hrrs_cleanup_task(hrrs_cleanup_task) { } | |
2152 | 1713 |
1714 bool G1NoteEndOfConcMarkClosure::doHeapRegion(HeapRegion *hr) { | |
342 | 1715 // We use a claim value of zero here because all regions |
1716 // were claimed with value 1 in the FinalCount task. | |
2152 | 1717 hr->reset_gc_time_stamp(); |
1718 if (!hr->continuesHumongous()) { | |
342 | 1719 double start = os::elapsedTime(); |
1720 _regions_claimed++; | |
2152 | 1721 hr->note_end_of_marking(); |
1722 _max_live_bytes += hr->max_live_bytes(); | |
2173 | 1723 _g1->free_region_if_empty(hr, |
1724 &_freed_bytes, | |
1725 _local_cleanup_list, | |
1726 _humongous_proxy_set, | |
1727 _hrrs_cleanup_task, | |
1728 true /* par */); | |
342 | 1729 double region_time = (os::elapsedTime() - start); |
1730 _claimed_region_time += region_time; | |
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1731 if (region_time > _max_region_time) { |
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1732 _max_region_time = region_time; |
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1733 } |
342 | 1734 } |
1735 return false; | |
1736 } | |
1737 | |
1738 void ConcurrentMark::cleanup() { | |
1739 // world is stopped at this checkpoint | |
1740 assert(SafepointSynchronize::is_at_safepoint(), | |
1741 "world should be stopped"); | |
1742 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1743 | |
1744 // If a full collection has happened, we shouldn't do this. | |
1745 if (has_aborted()) { | |
1746 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1747 return; | |
1748 } | |
1749 | |
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 | |
342 | 1768 // Do counting once more with the world stopped for good measure. |
1769 G1ParFinalCountTask g1_par_count_task(g1h, nextMarkBitMap(), | |
1770 &_region_bm, &_card_bm); | |
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1771 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1772 assert(g1h->check_heap_region_claim_values( |
1773 HeapRegion::InitialClaimValue), | |
1774 "sanity check"); | |
1775 | |
342 | 1776 int n_workers = g1h->workers()->total_workers(); |
1777 g1h->set_par_threads(n_workers); | |
1778 g1h->workers()->run_task(&g1_par_count_task); | |
1779 g1h->set_par_threads(0); | |
355 | 1780 |
1781 assert(g1h->check_heap_region_claim_values( | |
1782 HeapRegion::FinalCountClaimValue), | |
1783 "sanity check"); | |
342 | 1784 } else { |
1785 g1_par_count_task.work(0); | |
1786 } | |
1787 | |
1788 size_t known_garbage_bytes = | |
1789 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
1790 #if 0 | |
1791 gclog_or_tty->print_cr("used %1.2lf, live %1.2lf, garbage %1.2lf", | |
1792 (double) g1_par_count_task.used_bytes() / (double) (1024 * 1024), | |
1793 (double) g1_par_count_task.live_bytes() / (double) (1024 * 1024), | |
1794 (double) known_garbage_bytes / (double) (1024 * 1024)); | |
1795 #endif // 0 | |
1796 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
1797 | |
1798 size_t start_used_bytes = g1h->used(); | |
1799 _at_least_one_mark_complete = true; | |
1800 g1h->set_marking_complete(); | |
1801 | |
1802 double count_end = os::elapsedTime(); | |
1803 double this_final_counting_time = (count_end - start); | |
1804 if (G1PrintParCleanupStats) { | |
1805 gclog_or_tty->print_cr("Cleanup:"); | |
1806 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
1807 this_final_counting_time*1000.0); | |
1808 } | |
1809 _total_counting_time += this_final_counting_time; | |
1810 | |
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1811 if (G1PrintRegionLivenessInfo) { |
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1812 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1813 _g1h->heap_region_iterate(&cl); |
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1814 } |
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1815 |
342 | 1816 // Install newly created mark bitMap as "prev". |
1817 swapMarkBitMaps(); | |
1818 | |
1819 g1h->reset_gc_time_stamp(); | |
1820 | |
1821 // Note end of marking in all heap regions. | |
1822 double note_end_start = os::elapsedTime(); | |
2152 | 1823 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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1824 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1825 int n_workers = g1h->workers()->total_workers(); |
1826 g1h->set_par_threads(n_workers); | |
1827 g1h->workers()->run_task(&g1_par_note_end_task); | |
1828 g1h->set_par_threads(0); | |
355 | 1829 |
1830 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
1831 "sanity check"); | |
342 | 1832 } else { |
1833 g1_par_note_end_task.work(0); | |
1834 } | |
2152 | 1835 |
1836 if (!cleanup_list_is_empty()) { | |
1837 // The cleanup list is not empty, so we'll have to process it | |
1838 // concurrently. Notify anyone else that might be wanting free | |
1839 // regions that there will be more free regions coming soon. | |
1840 g1h->set_free_regions_coming(); | |
1841 } | |
342 | 1842 double note_end_end = os::elapsedTime(); |
1843 if (G1PrintParCleanupStats) { | |
1844 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
1845 (note_end_end - note_end_start)*1000.0); | |
1846 } | |
1847 | |
355 | 1848 |
342 | 1849 // call below, since it affects the metric by which we sort the heap |
1850 // regions. | |
1851 if (G1ScrubRemSets) { | |
1852 double rs_scrub_start = os::elapsedTime(); | |
1853 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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1854 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1855 int n_workers = g1h->workers()->total_workers(); |
1856 g1h->set_par_threads(n_workers); | |
1857 g1h->workers()->run_task(&g1_par_scrub_rs_task); | |
1858 g1h->set_par_threads(0); | |
355 | 1859 |
1860 assert(g1h->check_heap_region_claim_values( | |
1861 HeapRegion::ScrubRemSetClaimValue), | |
1862 "sanity check"); | |
342 | 1863 } else { |
1864 g1_par_scrub_rs_task.work(0); | |
1865 } | |
1866 | |
1867 double rs_scrub_end = os::elapsedTime(); | |
1868 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
1869 _total_rs_scrub_time += this_rs_scrub_time; | |
1870 } | |
1871 | |
1872 // this will also free any regions totally full of garbage objects, | |
1873 // and sort the regions. | |
1874 g1h->g1_policy()->record_concurrent_mark_cleanup_end( | |
1875 g1_par_note_end_task.freed_bytes(), | |
1876 g1_par_note_end_task.max_live_bytes()); | |
1877 | |
1878 // Statistics. | |
1879 double end = os::elapsedTime(); | |
1880 _cleanup_times.add((end - start) * 1000.0); | |
1881 | |
1882 // G1CollectedHeap::heap()->print(); | |
1883 // gclog_or_tty->print_cr("HEAP GC TIME STAMP : %d", | |
1884 // G1CollectedHeap::heap()->get_gc_time_stamp()); | |
1885 | |
1886 if (PrintGC || PrintGCDetails) { | |
1887 g1h->print_size_transition(gclog_or_tty, | |
1888 start_used_bytes, | |
1889 g1h->used(), | |
1890 g1h->capacity()); | |
1891 } | |
1892 | |
1893 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
1894 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
1895 | |
1896 // We need to make this be a "collection" so any collection pause that | |
1897 // races with it goes around and waits for completeCleanup to finish. | |
1898 g1h->increment_total_collections(); | |
1899 | |
751 | 1900 if (VerifyDuringGC) { |
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1901 HandleMark hm; // handle scope |
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1902 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1903 Universe::heap()->prepare_for_verify(); |
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1904 Universe::verify(/* allow dirty */ true, |
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1905 /* silent */ false, |
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1906 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 1907 } |
2152 | 1908 |
1909 g1h->verify_region_sets_optional(); | |
342 | 1910 } |
1911 | |
1912 void ConcurrentMark::completeCleanup() { | |
1913 if (has_aborted()) return; | |
1914 | |
2152 | 1915 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1916 | |
1917 _cleanup_list.verify_optional(); | |
2361 | 1918 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 1919 |
1920 if (G1ConcRegionFreeingVerbose) { | |
1921 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
1922 "cleanup list has "SIZE_FORMAT" entries", | |
1923 _cleanup_list.length()); | |
1924 } | |
1925 | |
1926 // Noone else should be accessing the _cleanup_list at this point, | |
1927 // so it's not necessary to take any locks | |
1928 while (!_cleanup_list.is_empty()) { | |
1929 HeapRegion* hr = _cleanup_list.remove_head(); | |
1930 assert(hr != NULL, "the list was not empty"); | |
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1931 hr->par_clear(); |
2361 | 1932 tmp_free_list.add_as_tail(hr); |
2152 | 1933 |
1934 // Instead of adding one region at a time to the secondary_free_list, | |
1935 // we accumulate them in the local list and move them a few at a | |
1936 // time. This also cuts down on the number of notify_all() calls | |
1937 // we do during this process. We'll also append the local list when | |
1938 // _cleanup_list is empty (which means we just removed the last | |
1939 // region from the _cleanup_list). | |
2361 | 1940 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 1941 _cleanup_list.is_empty()) { |
1942 if (G1ConcRegionFreeingVerbose) { | |
1943 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
1944 "appending "SIZE_FORMAT" entries to the " | |
1945 "secondary_free_list, clean list still has " | |
1946 SIZE_FORMAT" entries", | |
2361 | 1947 tmp_free_list.length(), |
2152 | 1948 _cleanup_list.length()); |
342 | 1949 } |
2152 | 1950 |
1951 { | |
1952 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 1953 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 1954 SecondaryFreeList_lock->notify_all(); |
1955 } | |
1956 | |
1957 if (G1StressConcRegionFreeing) { | |
1958 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
1959 os::sleep(Thread::current(), (jlong) 1, false); | |
1960 } | |
1961 } | |
342 | 1962 } |
1963 } | |
2361 | 1964 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 1965 } |
1966 | |
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1967 // Support closures for reference procssing in G1 |
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1968 |
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1969 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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1970 HeapWord* addr = (HeapWord*)obj; |
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1971 return addr != NULL && |
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1972 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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1973 } |
342 | 1974 |
1975 class G1CMKeepAliveClosure: public OopClosure { | |
1976 G1CollectedHeap* _g1; | |
1977 ConcurrentMark* _cm; | |
1978 CMBitMap* _bitMap; | |
1979 public: | |
1980 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm, | |
1981 CMBitMap* bitMap) : | |
1982 _g1(g1), _cm(cm), | |
1983 _bitMap(bitMap) {} | |
1984 | |
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1985 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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1986 virtual void do_oop( oop* p) { do_oop_work(p); } |
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1987 |
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1988 template <class T> void do_oop_work(T* p) { |
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1989 oop obj = oopDesc::load_decode_heap_oop(p); |
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1990 HeapWord* addr = (HeapWord*)obj; |
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1991 |
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1992 if (_cm->verbose_high()) { |
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1993 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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1994 "*"PTR_FORMAT" = "PTR_FORMAT, |
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1995 p, (void*) obj); |
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1996 } |
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1997 |
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1998 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
342 | 1999 _bitMap->mark(addr); |
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2000 _cm->mark_stack_push(obj); |
342 | 2001 } |
2002 } | |
2003 }; | |
2004 | |
2005 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
2006 CMMarkStack* _markStack; | |
2007 CMBitMap* _bitMap; | |
2008 G1CMKeepAliveClosure* _oopClosure; | |
2009 public: | |
2010 G1CMDrainMarkingStackClosure(CMBitMap* bitMap, CMMarkStack* markStack, | |
2011 G1CMKeepAliveClosure* oopClosure) : | |
2012 _bitMap(bitMap), | |
2013 _markStack(markStack), | |
2014 _oopClosure(oopClosure) | |
2015 {} | |
2016 | |
2017 void do_void() { | |
2018 _markStack->drain((OopClosure*)_oopClosure, _bitMap, false); | |
2019 } | |
2020 }; | |
2021 | |
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2022 // 'Keep Alive' closure used by parallel reference processing. |
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2023 // An instance of this closure is used in the parallel reference processing |
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2024 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2025 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2026 // placed on to discovered ref lists once so we can mark and push with no |
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2027 // need to check whether the object has already been marked. Using the |
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2028 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2029 // operating on the global mark stack. This means that an individual |
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2030 // worker would be doing lock-free pushes while it processes its own |
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2031 // discovered ref list followed by drain call. If the discovered ref lists |
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2032 // are unbalanced then this could cause interference with the other |
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2033 // workers. Using a CMTask (and its embedded local data structures) |
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2034 // avoids that potential interference. |
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2035 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2036 ConcurrentMark* _cm; |
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2037 CMTask* _task; |
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2038 CMBitMap* _bitMap; |
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2039 int _ref_counter_limit; |
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2040 int _ref_counter; |
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2041 public: |
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2042 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, |
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2043 CMTask* task, |
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2044 CMBitMap* bitMap) : |
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2045 _cm(cm), _task(task), _bitMap(bitMap), |
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2046 _ref_counter_limit(G1RefProcDrainInterval) |
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2047 { |
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2048 assert(_ref_counter_limit > 0, "sanity"); |
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2049 _ref_counter = _ref_counter_limit; |
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2050 } |
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2051 |
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2052 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2053 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2054 |
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2055 template <class T> void do_oop_work(T* p) { |
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2056 if (!_cm->has_overflown()) { |
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2057 oop obj = oopDesc::load_decode_heap_oop(p); |
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2058 if (_cm->verbose_high()) { |
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2059 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2060 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2061 _task->task_id(), p, (void*) obj); |
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2062 } |
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2063 |
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2064 _task->deal_with_reference(obj); |
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2065 _ref_counter--; |
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2066 |
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2067 if (_ref_counter == 0) { |
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2068 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2069 // reachable from them on to the local stack (and possibly the global stack). |
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2070 // Call do_marking_step() to process these entries. We call the routine in a |
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2071 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2072 // with the entries that we've pushed as a result of the deal_with_reference |
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2073 // calls above) or we overflow. |
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2074 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2075 // while there may still be some work to do. (See the comment at the |
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2076 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2077 // is reaching the specified time target.) It is only when |
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2078 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2079 // that the marking has completed. |
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2080 do { |
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2081 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2082 _task->do_marking_step(mark_step_duration_ms, |
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2083 false /* do_stealing */, |
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2084 false /* do_termination */); |
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2085 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2086 _ref_counter = _ref_counter_limit; |
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2087 } |
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2088 } else { |
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2089 if (_cm->verbose_high()) { |
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2090 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
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2091 } |
2174
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2092 } |
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2093 } |
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2094 }; |
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2095 |
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2096 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
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2097 ConcurrentMark* _cm; |
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2098 CMTask* _task; |
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2099 public: |
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2100 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
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2101 _cm(cm), _task(task) |
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2102 {} |
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2103 |
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2104 void do_void() { |
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2105 do { |
3776
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2106 if (_cm->verbose_high()) { |
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2107 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
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2108 _task->task_id()); |
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2109 } |
2174
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2110 |
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2111 // We call CMTask::do_marking_step() to completely drain the local and |
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2112 // global marking stacks. The routine is called in a loop, which we'll |
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2113 // exit if there's nothing more to do (i.e. we'completely drained the |
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2114 // entries that were pushed as a result of applying the |
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2115 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
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2116 // lists above) or we overflow the global marking stack. |
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2117 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2118 // while there may still be some work to do. (See the comment at the |
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2119 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2120 // is reaching the specified time target.) It is only when |
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2121 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2122 // that the marking has completed. |
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2123 |
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2124 _task->do_marking_step(1000000000.0 /* something very large */, |
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2125 true /* do_stealing */, |
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2126 true /* do_termination */); |
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2127 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2128 } |
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2129 }; |
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2130 |
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2131 // Implementation of AbstractRefProcTaskExecutor for G1 |
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2132 class G1RefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2133 private: |
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2134 G1CollectedHeap* _g1h; |
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2135 ConcurrentMark* _cm; |
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2136 CMBitMap* _bitmap; |
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2137 WorkGang* _workers; |
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2138 int _active_workers; |
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2139 |
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2140 public: |
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2141 G1RefProcTaskExecutor(G1CollectedHeap* g1h, |
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2142 ConcurrentMark* cm, |
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2143 CMBitMap* bitmap, |
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2144 WorkGang* workers, |
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2145 int n_workers) : |
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2146 _g1h(g1h), _cm(cm), _bitmap(bitmap), |
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2147 _workers(workers), _active_workers(n_workers) |
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2148 { } |
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2149 |
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2150 // Executes the given task using concurrent marking worker threads. |
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2151 virtual void execute(ProcessTask& task); |
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2152 virtual void execute(EnqueueTask& task); |
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2153 }; |
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2154 |
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2155 class G1RefProcTaskProxy: public AbstractGangTask { |
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2156 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2157 ProcessTask& _proc_task; |
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2158 G1CollectedHeap* _g1h; |
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2159 ConcurrentMark* _cm; |
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2160 CMBitMap* _bitmap; |
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2161 |
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2162 public: |
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2163 G1RefProcTaskProxy(ProcessTask& proc_task, |
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2164 G1CollectedHeap* g1h, |
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2165 ConcurrentMark* cm, |
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2166 CMBitMap* bitmap) : |
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2167 AbstractGangTask("Process reference objects in parallel"), |
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2168 _proc_task(proc_task), _g1h(g1h), _cm(cm), _bitmap(bitmap) |
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2169 {} |
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2170 |
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2171 virtual void work(int i) { |
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2172 CMTask* marking_task = _cm->task(i); |
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2173 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2174 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task, _bitmap); |
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2175 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2176 |
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2177 _proc_task.work(i, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2178 } |
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2179 }; |
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2180 |
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2181 void G1RefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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2182 assert(_workers != NULL, "Need parallel worker threads."); |
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2183 |
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2184 G1RefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm, _bitmap); |
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2185 |
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2186 // We need to reset the phase for each task execution so that |
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2187 // the termination protocol of CMTask::do_marking_step works. |
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2188 _cm->set_phase(_active_workers, false /* concurrent */); |
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2189 _g1h->set_par_threads(_active_workers); |
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2190 _workers->run_task(&proc_task_proxy); |
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2191 _g1h->set_par_threads(0); |
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|
2192 } |
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|
2193 |
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2194 class G1RefEnqueueTaskProxy: public AbstractGangTask { |
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2195 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
2196 EnqueueTask& _enq_task; |
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|
2197 |
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|
2198 public: |
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|
2199 G1RefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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|
2200 AbstractGangTask("Enqueue reference objects in parallel"), |
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|
2201 _enq_task(enq_task) |
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|
2202 { } |
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|
2203 |
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2204 virtual void work(int i) { |
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2205 _enq_task.work(i); |
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|
2206 } |
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|
2207 }; |
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|
2208 |
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|
2209 void G1RefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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2210 assert(_workers != NULL, "Need parallel worker threads."); |
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|
2211 |
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|
2212 G1RefEnqueueTaskProxy enq_task_proxy(enq_task); |
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2213 |
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2214 _g1h->set_par_threads(_active_workers); |
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|
2215 _workers->run_task(&enq_task_proxy); |
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|
2216 _g1h->set_par_threads(0); |
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2217 } |
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2218 |
342 | 2219 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
2220 ResourceMark rm; | |
2221 HandleMark hm; | |
453
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2222 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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2223 ReferenceProcessor* rp = g1h->ref_processor(); |
342 | 2224 |
1974
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2225 // See the comment in G1CollectedHeap::ref_processing_init() |
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2226 // about how reference processing currently works in G1. |
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|
2227 |
342 | 2228 // Process weak references. |
457
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|
2229 rp->setup_policy(clear_all_soft_refs); |
342 | 2230 assert(_markStack.isEmpty(), "mark stack should be empty"); |
2231 | |
2037
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diff
changeset
|
2232 G1CMIsAliveClosure g1_is_alive(g1h); |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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diff
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|
2233 G1CMKeepAliveClosure g1_keep_alive(g1h, this, nextMarkBitMap()); |
342 | 2234 G1CMDrainMarkingStackClosure |
2037
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7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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diff
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|
2235 g1_drain_mark_stack(nextMarkBitMap(), &_markStack, &g1_keep_alive); |
2174
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2236 // We use the work gang from the G1CollectedHeap and we utilize all |
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|
2237 // the worker threads. |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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2361
diff
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|
2238 int active_workers = g1h->workers() ? g1h->workers()->total_workers() : 1; |
92da084fefc9
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|
2239 active_workers = MAX2(MIN2(active_workers, (int)_max_task_num), 1); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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diff
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|
2240 |
234761c55641
6608385: G1: need to support parallel reference processing
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|
2241 G1RefProcTaskExecutor par_task_executor(g1h, this, nextMarkBitMap(), |
234761c55641
6608385: G1: need to support parallel reference processing
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|
2242 g1h->workers(), active_workers); |
234761c55641
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diff
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|
2243 |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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diff
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|
2244 |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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diff
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|
2245 if (rp->processing_is_mt()) { |
234761c55641
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|
2246 // Set the degree of MT here. If the discovery is done MT, there |
234761c55641
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diff
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|
2247 // may have been a different number of threads doing the discovery |
234761c55641
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diff
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|
2248 // and a different number of discovered lists may have Ref objects. |
234761c55641
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diff
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|
2249 // That is OK as long as the Reference lists are balanced (see |
234761c55641
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diff
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|
2250 // balance_all_queues() and balance_queues()). |
2369
92da084fefc9
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|
2251 rp->set_active_mt_degree(active_workers); |
2174
234761c55641
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|
2252 |
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2253 rp->process_discovered_references(&g1_is_alive, |
234761c55641
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|
2254 &g1_keep_alive, |
234761c55641
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|
2255 &g1_drain_mark_stack, |
234761c55641
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|
2256 &par_task_executor); |
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|
2257 |
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|
2258 // The work routines of the parallel keep_alive and drain_marking_stack |
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2259 // will set the has_overflown flag if we overflow the global marking |
234761c55641
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|
2260 // stack. |
234761c55641
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|
2261 } else { |
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|
2262 rp->process_discovered_references(&g1_is_alive, |
234761c55641
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|
2263 &g1_keep_alive, |
234761c55641
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diff
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|
2264 &g1_drain_mark_stack, |
234761c55641
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diff
changeset
|
2265 NULL); |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
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diff
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|
2266 |
234761c55641
6608385: G1: need to support parallel reference processing
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diff
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|
2267 } |
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|
2268 |
342 | 2269 assert(_markStack.overflow() || _markStack.isEmpty(), |
2174
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|
2270 "mark stack should be empty (unless it overflowed)"); |
342 | 2271 if (_markStack.overflow()) { |
2174
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6608385: G1: need to support parallel reference processing
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diff
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|
2272 // Should have been done already when we tried to push an |
234761c55641
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diff
changeset
|
2273 // entry on to the global mark stack. But let's do it again. |
342 | 2274 set_has_overflown(); |
2275 } | |
2276 | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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diff
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|
2277 if (rp->processing_is_mt()) { |
234761c55641
6608385: G1: need to support parallel reference processing
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diff
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|
2278 assert(rp->num_q() == active_workers, "why not"); |
234761c55641
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|
2279 rp->enqueue_discovered_references(&par_task_executor); |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2280 } else { |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2281 rp->enqueue_discovered_references(); |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2282 } |
234761c55641
6608385: G1: need to support parallel reference processing
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diff
changeset
|
2283 |
342 | 2284 rp->verify_no_references_recorded(); |
2285 assert(!rp->discovery_enabled(), "should have been disabled"); | |
2286 | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2287 // Now clean up stale oops in StringTable |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
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1974
diff
changeset
|
2288 StringTable::unlink(&g1_is_alive); |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2289 // 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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changeset
|
2290 SymbolTable::unlink(); |
342 | 2291 } |
2292 | |
2293 void ConcurrentMark::swapMarkBitMaps() { | |
2294 CMBitMapRO* temp = _prevMarkBitMap; | |
2295 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2296 _nextMarkBitMap = (CMBitMap*) temp; | |
2297 } | |
2298 | |
2299 class CMRemarkTask: public AbstractGangTask { | |
2300 private: | |
2301 ConcurrentMark *_cm; | |
2302 | |
2303 public: | |
2304 void work(int worker_i) { | |
2305 // Since all available tasks are actually started, we should | |
2306 // only proceed if we're supposed to be actived. | |
2307 if ((size_t)worker_i < _cm->active_tasks()) { | |
2308 CMTask* task = _cm->task(worker_i); | |
2309 task->record_start_time(); | |
2310 do { | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
2311 task->do_marking_step(1000000000.0 /* something very large */, |
234761c55641
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diff
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|
2312 true /* do_stealing */, |
234761c55641
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diff
changeset
|
2313 true /* do_termination */); |
342 | 2314 } while (task->has_aborted() && !_cm->has_overflown()); |
2315 // If we overflow, then we do not want to restart. We instead | |
2316 // want to abort remark and do concurrent marking again. | |
2317 task->record_end_time(); | |
2318 } | |
2319 } | |
2320 | |
2321 CMRemarkTask(ConcurrentMark* cm) : | |
2322 AbstractGangTask("Par Remark"), _cm(cm) { } | |
2323 }; | |
2324 | |
2325 void ConcurrentMark::checkpointRootsFinalWork() { | |
2326 ResourceMark rm; | |
2327 HandleMark hm; | |
2328 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2329 | |
2330 g1h->ensure_parsability(false); | |
2331 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2332 if (G1CollectedHeap::use_parallel_gc_threads()) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2333 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2334 // this is remark, so we'll use up all available threads |
2335 int active_workers = ParallelGCThreads; | |
2174
234761c55641
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2152
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|
2336 set_phase(active_workers, false /* concurrent */); |
342 | 2337 |
2338 CMRemarkTask remarkTask(this); | |
2339 // We will start all available threads, even if we decide that the | |
2340 // active_workers will be fewer. The extra ones will just bail out | |
2341 // immediately. | |
2342 int n_workers = g1h->workers()->total_workers(); | |
2343 g1h->set_par_threads(n_workers); | |
2344 g1h->workers()->run_task(&remarkTask); | |
2345 g1h->set_par_threads(0); | |
2346 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2347 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2348 // this is remark, so we'll use up all available threads |
2349 int active_workers = 1; | |
2174
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|
2350 set_phase(active_workers, false /* concurrent */); |
342 | 2351 |
2352 CMRemarkTask remarkTask(this); | |
2353 // We will start all available threads, even if we decide that the | |
2354 // active_workers will be fewer. The extra ones will just bail out | |
2355 // immediately. | |
2356 remarkTask.work(0); | |
2357 } | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
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|
2358 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2359 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2360 |
2361 print_stats(); | |
2362 | |
2363 #if VERIFY_OBJS_PROCESSED | |
2364 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
2365 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
2366 _scan_obj_cl.objs_processed, | |
2367 ThreadLocalObjQueue::objs_enqueued); | |
2368 guarantee(_scan_obj_cl.objs_processed == | |
2369 ThreadLocalObjQueue::objs_enqueued, | |
2370 "Different number of objs processed and enqueued."); | |
2371 } | |
2372 #endif | |
2373 } | |
2374 | |
1044 | 2375 #ifndef PRODUCT |
2376 | |
1388 | 2377 class PrintReachableOopClosure: public OopClosure { |
342 | 2378 private: |
2379 G1CollectedHeap* _g1h; | |
2380 outputStream* _out; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2381 VerifyOption _vo; |
1388 | 2382 bool _all; |
342 | 2383 |
2384 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2385 PrintReachableOopClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2386 VerifyOption vo, |
1388 | 2387 bool all) : |
1044 | 2388 _g1h(G1CollectedHeap::heap()), |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2389 _out(out), _vo(vo), _all(all) { } |
342 | 2390 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
831
diff
changeset
|
2391 void do_oop(narrowOop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
changeset
|
2392 void do_oop( oop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
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|
2393 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
831
diff
changeset
|
2394 template <class T> void do_oop_work(T* p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
831
diff
changeset
|
2395 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2396 const char* str = NULL; |
2397 const char* str2 = ""; | |
2398 | |
1388 | 2399 if (obj == NULL) { |
2400 str = ""; | |
2401 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2402 str = " O"; | |
2403 } else { | |
342 | 2404 HeapRegion* hr = _g1h->heap_region_containing(obj); |
1023
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6888619: G1: too many guarantees in concurrent marking
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1022
diff
changeset
|
2405 guarantee(hr != NULL, "invariant"); |
1044 | 2406 bool over_tams = false; |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3771
diff
changeset
|
2407 bool marked = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2408 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3771
diff
changeset
|
2409 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3771
diff
changeset
|
2410 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2411 over_tams = hr->obj_allocated_since_prev_marking(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2412 marked = _g1h->isMarkedPrev(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2413 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2414 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2415 over_tams = hr->obj_allocated_since_next_marking(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2416 marked = _g1h->isMarkedNext(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3771
diff
changeset
|
2417 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3771
diff
changeset
|
2418 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2419 marked = obj->is_gc_marked(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2420 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2421 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2422 ShouldNotReachHere(); |
1044 | 2423 } |
2424 | |
2425 if (over_tams) { | |
1388 | 2426 str = " >"; |
2427 if (marked) { | |
342 | 2428 str2 = " AND MARKED"; |
1044 | 2429 } |
1388 | 2430 } else if (marked) { |
2431 str = " M"; | |
1044 | 2432 } else { |
1388 | 2433 str = " NOT"; |
1044 | 2434 } |
342 | 2435 } |
2436 | |
1388 | 2437 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2438 p, (void*) obj, str, str2); |
2439 } | |
2440 }; | |
2441 | |
1388 | 2442 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2443 private: |
3772
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7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2444 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2445 outputStream* _out; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2446 VerifyOption _vo; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2447 bool _all; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2448 HeapRegion* _hr; |
342 | 2449 |
2450 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2451 PrintReachableObjectClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2452 VerifyOption vo, |
1388 | 2453 bool all, |
2454 HeapRegion* hr) : | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2455 _g1h(G1CollectedHeap::heap()), |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2456 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2457 |
2458 void do_object(oop o) { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2459 bool over_tams = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2460 bool marked = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2461 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2462 switch (_vo) { |
6747fd0512e0
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|
2463 case VerifyOption_G1UsePrevMarking: |
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|
2464 over_tams = _hr->obj_allocated_since_prev_marking(o); |
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|
2465 marked = _g1h->isMarkedPrev(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2466 break; |
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3771
diff
changeset
|
2467 case VerifyOption_G1UseNextMarking: |
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|
2468 over_tams = _hr->obj_allocated_since_next_marking(o); |
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|
2469 marked = _g1h->isMarkedNext(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
2470 break; |
6747fd0512e0
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johnc
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3771
diff
changeset
|
2471 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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diff
changeset
|
2472 marked = o->is_gc_marked(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2473 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2474 default: |
6747fd0512e0
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diff
changeset
|
2475 ShouldNotReachHere(); |
1388 | 2476 } |
2477 bool print_it = _all || over_tams || marked; | |
2478 | |
2479 if (print_it) { | |
2480 _out->print_cr(" "PTR_FORMAT"%s", | |
2481 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
3772
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diff
changeset
|
2482 PrintReachableOopClosure oopCl(_out, _vo, _all); |
1388 | 2483 o->oop_iterate(&oopCl); |
2484 } | |
342 | 2485 } |
2486 }; | |
2487 | |
1388 | 2488 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2489 private: |
2490 outputStream* _out; | |
3772
6747fd0512e0
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changeset
|
2491 VerifyOption _vo; |
1388 | 2492 bool _all; |
342 | 2493 |
2494 public: | |
2495 bool doHeapRegion(HeapRegion* hr) { | |
2496 HeapWord* b = hr->bottom(); | |
2497 HeapWord* e = hr->end(); | |
2498 HeapWord* t = hr->top(); | |
1044 | 2499 HeapWord* p = NULL; |
3772
6747fd0512e0
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diff
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|
2500 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2501 switch (_vo) { |
6747fd0512e0
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diff
changeset
|
2502 case VerifyOption_G1UsePrevMarking: |
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|
2503 p = hr->prev_top_at_mark_start(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2504 break; |
6747fd0512e0
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diff
changeset
|
2505 case VerifyOption_G1UseNextMarking: |
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|
2506 p = hr->next_top_at_mark_start(); |
6747fd0512e0
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johnc
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diff
changeset
|
2507 break; |
6747fd0512e0
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johnc
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3771
diff
changeset
|
2508 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
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johnc
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diff
changeset
|
2509 // When we are verifying marking using the mark word |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2510 // TAMS has no relevance. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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diff
changeset
|
2511 assert(p == NULL, "post-condition"); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2512 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2513 default: |
6747fd0512e0
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diff
changeset
|
2514 ShouldNotReachHere(); |
1044 | 2515 } |
342 | 2516 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2517 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2518 _out->cr(); |
2519 | |
2520 HeapWord* from = b; | |
2521 HeapWord* to = t; | |
2522 | |
2523 if (to > from) { | |
2524 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2525 _out->cr(); | |
3772
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diff
changeset
|
2526 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2527 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2528 _out->cr(); | |
2529 } | |
342 | 2530 |
2531 return false; | |
2532 } | |
2533 | |
3772
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|
2534 PrintReachableRegionClosure(outputStream* out, |
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diff
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|
2535 VerifyOption vo, |
1388 | 2536 bool all) : |
3772
6747fd0512e0
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diff
changeset
|
2537 _out(out), _vo(vo), _all(all) { } |
342 | 2538 }; |
2539 | |
3772
6747fd0512e0
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|
2540 static const char* verify_option_to_tams(VerifyOption vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2541 switch (vo) { |
6747fd0512e0
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diff
changeset
|
2542 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
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diff
changeset
|
2543 return "PTAMS"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2544 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
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diff
changeset
|
2545 return "NTAMS"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2546 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2547 return "NONE"; |
6747fd0512e0
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3771
diff
changeset
|
2548 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3771
diff
changeset
|
2549 } |
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diff
changeset
|
2550 |
1388 | 2551 void ConcurrentMark::print_reachable(const char* str, |
3772
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diff
changeset
|
2552 VerifyOption vo, |
1388 | 2553 bool all) { |
2554 gclog_or_tty->cr(); | |
2555 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2556 |
2557 if (G1PrintReachableBaseFile == NULL) { | |
2558 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2559 return; | |
2560 } | |
2561 | |
2562 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2563 (JVM_MAXPATHLEN - 1)) { | |
2564 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2565 return; | |
2566 } | |
2567 | |
2568 char file_name[JVM_MAXPATHLEN]; | |
2569 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2570 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2571 | |
2572 fileStream fout(file_name); | |
2573 if (!fout.is_open()) { | |
2574 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2575 return; | |
2576 } | |
2577 | |
2578 outputStream* out = &fout; | |
3772
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diff
changeset
|
2579 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
1044 | 2580 out->cr(); |
2581 | |
1388 | 2582 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2583 out->cr(); |
3772
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3771
diff
changeset
|
2584 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2585 _g1h->heap_region_iterate(&rcl); |
1044 | 2586 out->cr(); |
2587 | |
2588 gclog_or_tty->print_cr(" done"); | |
1388 | 2589 gclog_or_tty->flush(); |
342 | 2590 } |
2591 | |
1044 | 2592 #endif // PRODUCT |
2593 | |
342 | 2594 // This note is for drainAllSATBBuffers and the code in between. |
2595 // In the future we could reuse a task to do this work during an | |
2596 // evacuation pause (since now tasks are not active and can be claimed | |
2597 // during an evacuation pause). This was a late change to the code and | |
2598 // is currently not being taken advantage of. | |
2599 | |
2600 class CMGlobalObjectClosure : public ObjectClosure { | |
2601 private: | |
2602 ConcurrentMark* _cm; | |
2603 | |
2604 public: | |
2605 void do_object(oop obj) { | |
2606 _cm->deal_with_reference(obj); | |
2607 } | |
2608 | |
2609 CMGlobalObjectClosure(ConcurrentMark* cm) : _cm(cm) { } | |
2610 }; | |
2611 | |
2612 void ConcurrentMark::deal_with_reference(oop obj) { | |
3771 | 2613 if (verbose_high()) { |
342 | 2614 gclog_or_tty->print_cr("[global] we're dealing with reference "PTR_FORMAT, |
2615 (void*) obj); | |
3771 | 2616 } |
342 | 2617 |
2618 HeapWord* objAddr = (HeapWord*) obj; | |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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831
diff
changeset
|
2619 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
342 | 2620 if (_g1h->is_in_g1_reserved(objAddr)) { |
3771 | 2621 assert(obj != NULL, "null check is implicit"); |
2622 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
2623 // Only get the containing region if the object is not marked on the | |
2624 // bitmap (otherwise, it's a waste of time since we won't do | |
2625 // anything with it). | |
2626 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
2627 if (!hr->obj_allocated_since_next_marking(obj)) { | |
2628 if (verbose_high()) { | |
2629 gclog_or_tty->print_cr("[global] "PTR_FORMAT" is not considered " | |
2630 "marked", (void*) obj); | |
2631 } | |
2632 | |
2633 // we need to mark it first | |
2634 if (_nextMarkBitMap->parMark(objAddr)) { | |
2635 // No OrderAccess:store_load() is needed. It is implicit in the | |
2636 // CAS done in parMark(objAddr) above | |
2637 HeapWord* finger = _finger; | |
2638 if (objAddr < finger) { | |
2639 if (verbose_high()) { | |
2640 gclog_or_tty->print_cr("[global] below the global finger " | |
2641 "("PTR_FORMAT"), pushing it", finger); | |
2642 } | |
2643 if (!mark_stack_push(obj)) { | |
2644 if (verbose_low()) { | |
2645 gclog_or_tty->print_cr("[global] global stack overflow during " | |
2646 "deal_with_reference"); | |
2647 } | |
2648 } | |
342 | 2649 } |
2650 } | |
2651 } | |
2652 } | |
2653 } | |
2654 } | |
2655 | |
2656 void ConcurrentMark::drainAllSATBBuffers() { | |
2657 CMGlobalObjectClosure oc(this); | |
2658 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
2659 satb_mq_set.set_closure(&oc); | |
2660 | |
2661 while (satb_mq_set.apply_closure_to_completed_buffer()) { | |
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|
2662 if (verbose_medium()) { |
342 | 2663 gclog_or_tty->print_cr("[global] processed an SATB buffer"); |
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diff
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|
2664 } |
342 | 2665 } |
2666 | |
2667 // no need to check whether we should do this, as this is only | |
2668 // called during an evacuation pause | |
2669 satb_mq_set.iterate_closure_all_threads(); | |
2670 | |
2671 satb_mq_set.set_closure(NULL); | |
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diff
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|
2672 assert(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2673 } |
2674 | |
2675 void ConcurrentMark::markPrev(oop p) { | |
2676 // Note we are overriding the read-only view of the prev map here, via | |
2677 // the cast. | |
2678 ((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*)p); | |
2679 } | |
2680 | |
2681 void ConcurrentMark::clear(oop p) { | |
2682 assert(p != NULL && p->is_oop(), "expected an oop"); | |
2683 HeapWord* addr = (HeapWord*)p; | |
2684 assert(addr >= _nextMarkBitMap->startWord() || | |
2685 addr < _nextMarkBitMap->endWord(), "in a region"); | |
2686 | |
2687 _nextMarkBitMap->clear(addr); | |
2688 } | |
2689 | |
2690 void ConcurrentMark::clearRangeBothMaps(MemRegion mr) { | |
2691 // Note we are overriding the read-only view of the prev map here, via | |
2692 // the cast. | |
2693 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
2694 _nextMarkBitMap->clearRange(mr); | |
2695 } | |
2696 | |
2697 HeapRegion* | |
2698 ConcurrentMark::claim_region(int task_num) { | |
2699 // "checkpoint" the finger | |
2700 HeapWord* finger = _finger; | |
2701 | |
2702 // _heap_end will not change underneath our feet; it only changes at | |
2703 // yield points. | |
2704 while (finger < _heap_end) { | |
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2705 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2706 |
3771 | 2707 // Note on how this code handles humongous regions. In the |
2708 // normal case the finger will reach the start of a "starts | |
2709 // humongous" (SH) region. Its end will either be the end of the | |
2710 // last "continues humongous" (CH) region in the sequence, or the | |
2711 // standard end of the SH region (if the SH is the only region in | |
2712 // the sequence). That way claim_region() will skip over the CH | |
2713 // regions. However, there is a subtle race between a CM thread | |
2714 // executing this method and a mutator thread doing a humongous | |
2715 // object allocation. The two are not mutually exclusive as the CM | |
2716 // thread does not need to hold the Heap_lock when it gets | |
2717 // here. So there is a chance that claim_region() will come across | |
2718 // a free region that's in the progress of becoming a SH or a CH | |
2719 // region. In the former case, it will either | |
2720 // a) Miss the update to the region's end, in which case it will | |
2721 // visit every subsequent CH region, will find their bitmaps | |
2722 // empty, and do nothing, or | |
2723 // b) Will observe the update of the region's end (in which case | |
2724 // it will skip the subsequent CH regions). | |
2725 // If it comes across a region that suddenly becomes CH, the | |
2726 // scenario will be similar to b). So, the race between | |
2727 // claim_region() and a humongous object allocation might force us | |
2728 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2729 // iterations) but it should not introduce and correctness issues. | |
2730 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2731 HeapWord* bottom = curr_region->bottom(); |
2732 HeapWord* end = curr_region->end(); | |
2733 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2734 | |
3771 | 2735 if (verbose_low()) { |
342 | 2736 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
2737 "["PTR_FORMAT", "PTR_FORMAT"), " | |
2738 "limit = "PTR_FORMAT, | |
2739 task_num, curr_region, bottom, end, limit); | |
3771 | 2740 } |
2741 | |
2742 // Is the gap between reading the finger and doing the CAS too long? | |
2743 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2744 if (res == finger) { |
2745 // we succeeded | |
2746 | |
2747 // notice that _finger == end cannot be guaranteed here since, | |
2748 // someone else might have moved the finger even further | |
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diff
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|
2749 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2750 |
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2751 if (verbose_low()) { |
342 | 2752 gclog_or_tty->print_cr("[%d] we were successful with region = " |
2753 PTR_FORMAT, task_num, curr_region); | |
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|
2754 } |
342 | 2755 |
2756 if (limit > bottom) { | |
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|
2757 if (verbose_low()) { |
342 | 2758 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
2759 "returning it ", task_num, curr_region); | |
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|
2760 } |
342 | 2761 return curr_region; |
2762 } else { | |
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diff
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|
2763 assert(limit == bottom, |
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diff
changeset
|
2764 "the region limit should be at bottom"); |
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|
2765 if (verbose_low()) { |
342 | 2766 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
2767 "returning NULL", task_num, curr_region); | |
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|
2768 } |
342 | 2769 // we return NULL and the caller should try calling |
2770 // claim_region() again. | |
2771 return NULL; | |
2772 } | |
2773 } else { | |
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|
2774 assert(_finger > finger, "the finger should have moved forward"); |
3776
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|
2775 if (verbose_low()) { |
342 | 2776 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
2777 "global finger = "PTR_FORMAT", " | |
2778 "our finger = "PTR_FORMAT, | |
2779 task_num, _finger, finger); | |
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2780 } |
342 | 2781 |
2782 // read it again | |
2783 finger = _finger; | |
2784 } | |
2785 } | |
2786 | |
2787 return NULL; | |
2788 } | |
2789 | |
1835
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6941395: G1: Use only lock-free versions of region stack push() and pop()
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diff
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|
2790 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
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2791 bool result = false; |
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2792 for (int i = 0; i < (int)_max_task_num; ++i) { |
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2793 CMTask* the_task = _tasks[i]; |
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2794 MemRegion mr = the_task->aborted_region(); |
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2795 if (mr.start() != NULL) { |
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2796 assert(mr.end() != NULL, "invariant"); |
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2797 assert(mr.word_size() > 0, "invariant"); |
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2798 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
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2799 assert(hr != NULL, "invariant"); |
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2800 if (hr->in_collection_set()) { |
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2801 // The region points into the collection set |
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2802 the_task->set_aborted_region(MemRegion()); |
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2803 result = true; |
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|
2804 } |
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|
2805 } |
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|
2806 } |
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|
2807 return result; |
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|
2808 } |
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|
2809 |
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2810 bool ConcurrentMark::has_aborted_regions() { |
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2811 for (int i = 0; i < (int)_max_task_num; ++i) { |
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2812 CMTask* the_task = _tasks[i]; |
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2813 MemRegion mr = the_task->aborted_region(); |
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2814 if (mr.start() != NULL) { |
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2815 assert(mr.end() != NULL, "invariant"); |
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2816 assert(mr.word_size() > 0, "invariant"); |
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2817 return true; |
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|
2818 } |
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|
2819 } |
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|
2820 return false; |
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|
2821 } |
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2822 |
342 | 2823 void ConcurrentMark::oops_do(OopClosure* cl) { |
3776
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2824 if (_markStack.size() > 0 && verbose_low()) { |
342 | 2825 gclog_or_tty->print_cr("[global] scanning the global marking stack, " |
2826 "size = %d", _markStack.size()); | |
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2827 } |
342 | 2828 // we first iterate over the contents of the mark stack... |
2829 _markStack.oops_do(cl); | |
2830 | |
2831 for (int i = 0; i < (int)_max_task_num; ++i) { | |
2832 OopTaskQueue* queue = _task_queues->queue((int)i); | |
2833 | |
3776
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2834 if (queue->size() > 0 && verbose_low()) { |
342 | 2835 gclog_or_tty->print_cr("[global] scanning task queue of task %d, " |
2836 "size = %d", i, queue->size()); | |
3776
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2837 } |
342 | 2838 |
2839 // ...then over the contents of the all the task queues. | |
2840 queue->oops_do(cl); | |
2841 } | |
2842 | |
1835
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2843 // Invalidate any entries, that are in the region stack, that |
342 | 2844 // point into the collection set |
2845 if (_regionStack.invalidate_entries_into_cset()) { | |
2846 // otherwise, any gray objects copied during the evacuation pause | |
2847 // might not be visited. | |
1023
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2848 assert(_should_gray_objects, "invariant"); |
342 | 2849 } |
1835
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2850 |
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2851 // Invalidate any aborted regions, recorded in the individual CM |
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2852 // tasks, that point into the collection set. |
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2853 if (invalidate_aborted_regions_in_cset()) { |
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2854 // otherwise, any gray objects copied during the evacuation pause |
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2855 // might not be visited. |
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2856 assert(_should_gray_objects, "invariant"); |
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2857 } |
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|
2858 |
342 | 2859 } |
2860 | |
3316
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|
2861 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
342 | 2862 _markStack.setEmpty(); |
2863 _markStack.clear_overflow(); | |
2864 _regionStack.setEmpty(); | |
2865 _regionStack.clear_overflow(); | |
3316
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|
2866 if (clear_overflow) { |
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|
2867 clear_has_overflown(); |
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2868 } else { |
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|
2869 assert(has_overflown(), "pre-condition"); |
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2870 } |
342 | 2871 _finger = _heap_start; |
2872 | |
2873 for (int i = 0; i < (int)_max_task_num; ++i) { | |
2874 OopTaskQueue* queue = _task_queues->queue(i); | |
2875 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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|
2876 // Clear any partial regions from the CMTasks |
a5c514e74487
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|
2877 _tasks[i]->clear_aborted_region(); |
342 | 2878 } |
2879 } | |
2880 | |
2881 void ConcurrentMark::print_stats() { | |
2882 if (verbose_stats()) { | |
2883 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
2884 for (size_t i = 0; i < _active_tasks; ++i) { | |
2885 _tasks[i]->print_stats(); | |
2886 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
2887 } | |
2888 } | |
2889 } | |
2890 | |
2891 class CSMarkOopClosure: public OopClosure { | |
2892 friend class CSMarkBitMapClosure; | |
2893 | |
2894 G1CollectedHeap* _g1h; | |
2895 CMBitMap* _bm; | |
2896 ConcurrentMark* _cm; | |
2897 oop* _ms; | |
2898 jint* _array_ind_stack; | |
2899 int _ms_size; | |
2900 int _ms_ind; | |
2901 int _array_increment; | |
2902 | |
2903 bool push(oop obj, int arr_ind = 0) { | |
2904 if (_ms_ind == _ms_size) { | |
2905 gclog_or_tty->print_cr("Mark stack is full."); | |
2906 return false; | |
2907 } | |
2908 _ms[_ms_ind] = obj; | |
3776
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|
2909 if (obj->is_objArray()) { |
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|
2910 _array_ind_stack[_ms_ind] = arr_ind; |
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|
2911 } |
342 | 2912 _ms_ind++; |
2913 return true; | |
2914 } | |
2915 | |
2916 oop pop() { | |
3776
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|
2917 if (_ms_ind == 0) { |
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|
2918 return NULL; |
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|
2919 } else { |
342 | 2920 _ms_ind--; |
2921 return _ms[_ms_ind]; | |
2922 } | |
2923 } | |
2924 | |
845
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|
2925 template <class T> bool drain() { |
342 | 2926 while (_ms_ind > 0) { |
2927 oop obj = pop(); | |
2928 assert(obj != NULL, "Since index was non-zero."); | |
2929 if (obj->is_objArray()) { | |
2930 jint arr_ind = _array_ind_stack[_ms_ind]; | |
2931 objArrayOop aobj = objArrayOop(obj); | |
2932 jint len = aobj->length(); | |
2933 jint next_arr_ind = arr_ind + _array_increment; | |
2934 if (next_arr_ind < len) { | |
2935 push(obj, next_arr_ind); | |
2936 } | |
2937 // Now process this portion of this one. | |
2938 int lim = MIN2(next_arr_ind, len); | |
2939 for (int j = arr_ind; j < lim; j++) { | |
912
308762b2bf14
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|
2940 do_oop(aobj->objArrayOopDesc::obj_at_addr<T>(j)); |
342 | 2941 } |
2942 | |
2943 } else { | |
2944 obj->oop_iterate(this); | |
2945 } | |
2946 if (abort()) return false; | |
2947 } | |
2948 return true; | |
2949 } | |
2950 | |
2951 public: | |
2952 CSMarkOopClosure(ConcurrentMark* cm, int ms_size) : | |
2953 _g1h(G1CollectedHeap::heap()), | |
2954 _cm(cm), | |
2955 _bm(cm->nextMarkBitMap()), | |
2956 _ms_size(ms_size), _ms_ind(0), | |
2957 _ms(NEW_C_HEAP_ARRAY(oop, ms_size)), | |
2958 _array_ind_stack(NEW_C_HEAP_ARRAY(jint, ms_size)), | |
2959 _array_increment(MAX2(ms_size/8, 16)) | |
2960 {} | |
2961 | |
2962 ~CSMarkOopClosure() { | |
2963 FREE_C_HEAP_ARRAY(oop, _ms); | |
2964 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
2965 } | |
2966 | |
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2967 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2968 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2969 |
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2970 template <class T> void do_oop_work(T* p) { |
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2971 T heap_oop = oopDesc::load_heap_oop(p); |
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|
2972 if (oopDesc::is_null(heap_oop)) return; |
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2973 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
342 | 2974 if (obj->is_forwarded()) { |
2975 // If the object has already been forwarded, we have to make sure | |
2976 // that it's marked. So follow the forwarding pointer. Note that | |
2977 // this does the right thing for self-forwarding pointers in the | |
2978 // evacuation failure case. | |
2979 obj = obj->forwardee(); | |
2980 } | |
2981 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
2982 if (hr != NULL) { | |
2983 if (hr->in_collection_set()) { | |
2984 if (_g1h->is_obj_ill(obj)) { | |
2985 _bm->mark((HeapWord*)obj); | |
2986 if (!push(obj)) { | |
2987 gclog_or_tty->print_cr("Setting abort in CSMarkOopClosure because push failed."); | |
2988 set_abort(); | |
2989 } | |
2990 } | |
2991 } else { | |
2992 // Outside the collection set; we need to gray it | |
2993 _cm->deal_with_reference(obj); | |
2994 } | |
2995 } | |
2996 } | |
2997 }; | |
2998 | |
2999 class CSMarkBitMapClosure: public BitMapClosure { | |
3000 G1CollectedHeap* _g1h; | |
3001 CMBitMap* _bitMap; | |
3002 ConcurrentMark* _cm; | |
3003 CSMarkOopClosure _oop_cl; | |
3004 public: | |
3005 CSMarkBitMapClosure(ConcurrentMark* cm, int ms_size) : | |
3006 _g1h(G1CollectedHeap::heap()), | |
3007 _bitMap(cm->nextMarkBitMap()), | |
3008 _oop_cl(cm, ms_size) | |
3009 {} | |
3010 | |
3011 ~CSMarkBitMapClosure() {} | |
3012 | |
3013 bool do_bit(size_t offset) { | |
3014 // convert offset into a HeapWord* | |
3015 HeapWord* addr = _bitMap->offsetToHeapWord(offset); | |
3016 assert(_bitMap->endWord() && addr < _bitMap->endWord(), | |
3017 "address out of range"); | |
3018 assert(_bitMap->isMarked(addr), "tautology"); | |
3019 oop obj = oop(addr); | |
3020 if (!obj->is_forwarded()) { | |
3021 if (!_oop_cl.push(obj)) return false; | |
845
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3022 if (UseCompressedOops) { |
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3023 if (!_oop_cl.drain<narrowOop>()) return false; |
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|
3024 } else { |
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3025 if (!_oop_cl.drain<oop>()) return false; |
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3026 } |
342 | 3027 } |
3028 // Otherwise... | |
3029 return true; | |
3030 } | |
3031 }; | |
3032 | |
3033 | |
3034 class CompleteMarkingInCSHRClosure: public HeapRegionClosure { | |
3035 CMBitMap* _bm; | |
3036 CSMarkBitMapClosure _bit_cl; | |
3037 enum SomePrivateConstants { | |
3038 MSSize = 1000 | |
3039 }; | |
3040 bool _completed; | |
3041 public: | |
3042 CompleteMarkingInCSHRClosure(ConcurrentMark* cm) : | |
3043 _bm(cm->nextMarkBitMap()), | |
3044 _bit_cl(cm, MSSize), | |
3045 _completed(true) | |
3046 {} | |
3047 | |
3048 ~CompleteMarkingInCSHRClosure() {} | |
3049 | |
3050 bool doHeapRegion(HeapRegion* r) { | |
3051 if (!r->evacuation_failed()) { | |
3052 MemRegion mr = MemRegion(r->bottom(), r->next_top_at_mark_start()); | |
3053 if (!mr.is_empty()) { | |
3054 if (!_bm->iterate(&_bit_cl, mr)) { | |
3055 _completed = false; | |
3056 return true; | |
3057 } | |
3058 } | |
3059 } | |
3060 return false; | |
3061 } | |
3062 | |
3063 bool completed() { return _completed; } | |
3064 }; | |
3065 | |
3066 class ClearMarksInHRClosure: public HeapRegionClosure { | |
3067 CMBitMap* _bm; | |
3068 public: | |
3069 ClearMarksInHRClosure(CMBitMap* bm): _bm(bm) { } | |
3070 | |
3071 bool doHeapRegion(HeapRegion* r) { | |
3072 if (!r->used_region().is_empty() && !r->evacuation_failed()) { | |
3073 MemRegion usedMR = r->used_region(); | |
3074 _bm->clearRange(r->used_region()); | |
3075 } | |
3076 return false; | |
3077 } | |
3078 }; | |
3079 | |
3080 void ConcurrentMark::complete_marking_in_collection_set() { | |
3081 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
3082 | |
3083 if (!g1h->mark_in_progress()) { | |
3084 g1h->g1_policy()->record_mark_closure_time(0.0); | |
3085 return; | |
3086 } | |
3087 | |
3088 int i = 1; | |
3089 double start = os::elapsedTime(); | |
3090 while (true) { | |
3091 i++; | |
3092 CompleteMarkingInCSHRClosure cmplt(this); | |
3093 g1h->collection_set_iterate(&cmplt); | |
3094 if (cmplt.completed()) break; | |
3095 } | |
3096 double end_time = os::elapsedTime(); | |
3097 double elapsed_time_ms = (end_time - start) * 1000.0; | |
3098 g1h->g1_policy()->record_mark_closure_time(elapsed_time_ms); | |
3099 | |
3100 ClearMarksInHRClosure clr(nextMarkBitMap()); | |
3101 g1h->collection_set_iterate(&clr); | |
3102 } | |
3103 | |
3104 // The next two methods deal with the following optimisation. Some | |
3105 // objects are gray by being marked and located above the finger. If | |
3106 // they are copied, during an evacuation pause, below the finger then | |
3107 // the need to be pushed on the stack. The observation is that, if | |
3108 // there are no regions in the collection set located above the | |
3109 // finger, then the above cannot happen, hence we do not need to | |
3110 // explicitly gray any objects when copying them to below the | |
3111 // finger. The global stack will be scanned to ensure that, if it | |
3112 // points to objects being copied, it will update their | |
3113 // location. There is a tricky situation with the gray objects in | |
3114 // region stack that are being coped, however. See the comment in | |
3115 // newCSet(). | |
3116 | |
3117 void ConcurrentMark::newCSet() { | |
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3118 if (!concurrent_marking_in_progress()) { |
342 | 3119 // nothing to do if marking is not in progress |
3120 return; | |
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3121 } |
342 | 3122 |
3123 // find what the lowest finger is among the global and local fingers | |
3124 _min_finger = _finger; | |
3125 for (int i = 0; i < (int)_max_task_num; ++i) { | |
3126 CMTask* task = _tasks[i]; | |
3127 HeapWord* task_finger = task->finger(); | |
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3128 if (task_finger != NULL && task_finger < _min_finger) { |
342 | 3129 _min_finger = task_finger; |
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3130 } |
342 | 3131 } |
3132 | |
3133 _should_gray_objects = false; | |
3134 | |
3135 // This fixes a very subtle and fustrating bug. It might be the case | |
3136 // that, during en evacuation pause, heap regions that contain | |
3137 // objects that are gray (by being in regions contained in the | |
3138 // region stack) are included in the collection set. Since such gray | |
3139 // objects will be moved, and because it's not easy to redirect | |
3140 // region stack entries to point to a new location (because objects | |
3141 // in one region might be scattered to multiple regions after they | |
3142 // are copied), one option is to ensure that all marked objects | |
3143 // copied during a pause are pushed on the stack. Notice, however, | |
3144 // that this problem can only happen when the region stack is not | |
3145 // empty during an evacuation pause. So, we make the fix a bit less | |
3146 // conservative and ensure that regions are pushed on the stack, | |
3147 // irrespective whether all collection set regions are below the | |
3148 // finger, if the region stack is not empty. This is expected to be | |
3149 // a rare case, so I don't think it's necessary to be smarted about it. | |
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3150 if (!region_stack_empty() || has_aborted_regions()) { |
342 | 3151 _should_gray_objects = true; |
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3152 } |
342 | 3153 } |
3154 | |
3155 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
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3156 if (!concurrent_marking_in_progress()) return; |
342 | 3157 |
3158 HeapWord* region_end = hr->end(); | |
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3159 if (region_end > _min_finger) { |
342 | 3160 _should_gray_objects = true; |
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3161 } |
342 | 3162 } |
3163 | |
3378
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3164 // Resets the region fields of active CMTasks whose values point |
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3165 // into the collection set. |
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3166 void ConcurrentMark::reset_active_task_region_fields_in_cset() { |
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3167 assert(SafepointSynchronize::is_at_safepoint(), "should be in STW"); |
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3168 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
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3169 |
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3170 for (int i = 0; i < (int)parallel_marking_threads(); i += 1) { |
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3171 CMTask* task = _tasks[i]; |
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3172 HeapWord* task_finger = task->finger(); |
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3173 if (task_finger != NULL) { |
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3174 assert(_g1h->is_in_g1_reserved(task_finger), "not in heap"); |
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3175 HeapRegion* finger_region = _g1h->heap_region_containing(task_finger); |
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3176 if (finger_region->in_collection_set()) { |
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3177 // The task's current region is in the collection set. |
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3178 // This region will be evacuated in the current GC and |
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3179 // the region fields in the task will be stale. |
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3180 task->giveup_current_region(); |
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3181 } |
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3182 } |
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3183 } |
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3184 } |
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3185 |
342 | 3186 // abandon current marking iteration due to a Full GC |
3187 void ConcurrentMark::abort() { | |
3188 // Clear all marks to force marking thread to do nothing | |
3189 _nextMarkBitMap->clearAll(); | |
3190 // Empty mark stack | |
3191 clear_marking_state(); | |
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3192 for (int i = 0; i < (int)_max_task_num; ++i) { |
342 | 3193 _tasks[i]->clear_region_fields(); |
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3194 } |
342 | 3195 _has_aborted = true; |
3196 | |
3197 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3198 satb_mq_set.abandon_partial_marking(); | |
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3199 // This can be called either during or outside marking, we'll read |
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3200 // the expected_active value from the SATB queue set. |
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3201 satb_mq_set.set_active_all_threads( |
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3202 false, /* new active value */ |
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3203 satb_mq_set.is_active() /* expected_active */); |
342 | 3204 } |
3205 | |
3206 static void print_ms_time_info(const char* prefix, const char* name, | |
3207 NumberSeq& ns) { | |
3208 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3209 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3210 if (ns.num() > 0) { | |
3211 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3212 prefix, ns.sd(), ns.maximum()); | |
3213 } | |
3214 } | |
3215 | |
3216 void ConcurrentMark::print_summary_info() { | |
3217 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3218 print_ms_time_info(" ", "init marks", _init_times); | |
3219 print_ms_time_info(" ", "remarks", _remark_times); | |
3220 { | |
3221 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3222 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3223 | |
3224 } | |
3225 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3226 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3227 _total_counting_time, | |
3228 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3229 (double)_cleanup_times.num() | |
3230 : 0.0)); | |
3231 if (G1ScrubRemSets) { | |
3232 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3233 _total_rs_scrub_time, | |
3234 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3235 (double)_cleanup_times.num() | |
3236 : 0.0)); | |
3237 } | |
3238 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3239 (_init_times.sum() + _remark_times.sum() + | |
3240 _cleanup_times.sum())/1000.0); | |
3241 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
3242 "(%8.2f s marking, %8.2f s counting).", | |
3243 cmThread()->vtime_accum(), | |
3244 cmThread()->vtime_mark_accum(), | |
3245 cmThread()->vtime_count_accum()); | |
3246 } | |
3247 | |
1019 | 3248 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
3249 _parallel_workers->print_worker_threads_on(st); | |
3250 } | |
3251 | |
342 | 3252 // Closures |
3253 // XXX: there seems to be a lot of code duplication here; | |
3254 // should refactor and consolidate the shared code. | |
3255 | |
3256 // This closure is used to mark refs into the CMS generation in | |
3257 // the CMS bit map. Called at the first checkpoint. | |
3258 | |
3259 // We take a break if someone is trying to stop the world. | |
3260 bool ConcurrentMark::do_yield_check(int worker_i) { | |
3261 if (should_yield()) { | |
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3262 if (worker_i == 0) { |
342 | 3263 _g1h->g1_policy()->record_concurrent_pause(); |
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3264 } |
342 | 3265 cmThread()->yield(); |
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3266 if (worker_i == 0) { |
342 | 3267 _g1h->g1_policy()->record_concurrent_pause_end(); |
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3268 } |
342 | 3269 return true; |
3270 } else { | |
3271 return false; | |
3272 } | |
3273 } | |
3274 | |
3275 bool ConcurrentMark::should_yield() { | |
3276 return cmThread()->should_yield(); | |
3277 } | |
3278 | |
3279 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3280 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3281 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3282 } | |
3283 | |
3284 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3285 void* last) { | |
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3286 return containing_card_is_marked(start) && |
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3287 containing_card_is_marked(last); |
342 | 3288 } |
3289 | |
3290 #ifndef PRODUCT | |
3291 // for debugging purposes | |
3292 void ConcurrentMark::print_finger() { | |
3293 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3294 _heap_start, _heap_end, _finger); | |
3295 for (int i = 0; i < (int) _max_task_num; ++i) { | |
3296 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
3297 } | |
3298 gclog_or_tty->print_cr(""); | |
3299 } | |
3300 #endif | |
3301 | |
3771 | 3302 void CMTask::scan_object(oop obj) { |
3303 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3304 | |
3305 if (_cm->verbose_high()) { | |
3306 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
3307 _task_id, (void*) obj); | |
3308 } | |
3309 | |
3310 size_t obj_size = obj->size(); | |
3311 _words_scanned += obj_size; | |
3312 | |
3313 obj->oop_iterate(_cm_oop_closure); | |
3314 statsOnly( ++_objs_scanned ); | |
3315 check_limits(); | |
3316 } | |
3317 | |
342 | 3318 // Closure for iteration over bitmaps |
3319 class CMBitMapClosure : public BitMapClosure { | |
3320 private: | |
3321 // the bitmap that is being iterated over | |
3322 CMBitMap* _nextMarkBitMap; | |
3323 ConcurrentMark* _cm; | |
3324 CMTask* _task; | |
3325 // true if we're scanning a heap region claimed by the task (so that | |
3326 // we move the finger along), false if we're not, i.e. currently when | |
3327 // scanning a heap region popped from the region stack (so that we | |
3328 // do not move the task finger along; it'd be a mistake if we did so). | |
3329 bool _scanning_heap_region; | |
3330 | |
3331 public: | |
3332 CMBitMapClosure(CMTask *task, | |
3333 ConcurrentMark* cm, | |
3334 CMBitMap* nextMarkBitMap) | |
3335 : _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } | |
3336 | |
3337 void set_scanning_heap_region(bool scanning_heap_region) { | |
3338 _scanning_heap_region = scanning_heap_region; | |
3339 } | |
3340 | |
3341 bool do_bit(size_t offset) { | |
3342 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3343 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3344 assert( addr < _cm->finger(), "invariant"); |
342 | 3345 |
3346 if (_scanning_heap_region) { | |
3347 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
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3348 assert(addr >= _task->finger(), "invariant"); |
342 | 3349 // We move that task's local finger along. |
3350 _task->move_finger_to(addr); | |
3351 } else { | |
3352 // We move the task's region finger along. | |
3353 _task->move_region_finger_to(addr); | |
3354 } | |
3355 | |
3356 _task->scan_object(oop(addr)); | |
3357 // we only partially drain the local queue and global stack | |
3358 _task->drain_local_queue(true); | |
3359 _task->drain_global_stack(true); | |
3360 | |
3361 // if the has_aborted flag has been raised, we need to bail out of | |
3362 // the iteration | |
3363 return !_task->has_aborted(); | |
3364 } | |
3365 }; | |
3366 | |
3367 // Closure for iterating over objects, currently only used for | |
3368 // processing SATB buffers. | |
3369 class CMObjectClosure : public ObjectClosure { | |
3370 private: | |
3371 CMTask* _task; | |
3372 | |
3373 public: | |
3374 void do_object(oop obj) { | |
3375 _task->deal_with_reference(obj); | |
3376 } | |
3377 | |
3378 CMObjectClosure(CMTask* task) : _task(task) { } | |
3379 }; | |
3380 | |
3771 | 3381 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3382 ConcurrentMark* cm, | |
3383 CMTask* task) | |
3384 : _g1h(g1h), _cm(cm), _task(task) { | |
3385 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3386 | |
3387 if (G1UseConcMarkReferenceProcessing) { | |
3388 _ref_processor = g1h->ref_processor(); | |
3389 assert(_ref_processor != NULL, "should not be NULL"); | |
342 | 3390 } |
3771 | 3391 } |
342 | 3392 |
3393 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3394 // Separated the asserts so that we know which one fires. |
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3395 assert(hr != NULL, |
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3396 "claim_region() should have filtered out continues humongous regions"); |
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3397 assert(!hr->continuesHumongous(), |
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3398 "claim_region() should have filtered out continues humongous regions"); |
342 | 3399 |
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3400 if (_cm->verbose_low()) { |
342 | 3401 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
3402 _task_id, hr); | |
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3403 } |
342 | 3404 |
3405 _curr_region = hr; | |
3406 _finger = hr->bottom(); | |
3407 update_region_limit(); | |
3408 } | |
3409 | |
3410 void CMTask::update_region_limit() { | |
3411 HeapRegion* hr = _curr_region; | |
3412 HeapWord* bottom = hr->bottom(); | |
3413 HeapWord* limit = hr->next_top_at_mark_start(); | |
3414 | |
3415 if (limit == bottom) { | |
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3416 if (_cm->verbose_low()) { |
342 | 3417 gclog_or_tty->print_cr("[%d] found an empty region " |
3418 "["PTR_FORMAT", "PTR_FORMAT")", | |
3419 _task_id, bottom, limit); | |
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3420 } |
342 | 3421 // The region was collected underneath our feet. |
3422 // We set the finger to bottom to ensure that the bitmap | |
3423 // iteration that will follow this will not do anything. | |
3424 // (this is not a condition that holds when we set the region up, | |
3425 // as the region is not supposed to be empty in the first place) | |
3426 _finger = bottom; | |
3427 } else if (limit >= _region_limit) { | |
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3428 assert(limit >= _finger, "peace of mind"); |
342 | 3429 } else { |
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3430 assert(limit < _region_limit, "only way to get here"); |
342 | 3431 // This can happen under some pretty unusual circumstances. An |
3432 // evacuation pause empties the region underneath our feet (NTAMS | |
3433 // at bottom). We then do some allocation in the region (NTAMS | |
3434 // stays at bottom), followed by the region being used as a GC | |
3435 // alloc region (NTAMS will move to top() and the objects | |
3436 // originally below it will be grayed). All objects now marked in | |
3437 // the region are explicitly grayed, if below the global finger, | |
3438 // and we do not need in fact to scan anything else. So, we simply | |
3439 // set _finger to be limit to ensure that the bitmap iteration | |
3440 // doesn't do anything. | |
3441 _finger = limit; | |
3442 } | |
3443 | |
3444 _region_limit = limit; | |
3445 } | |
3446 | |
3447 void CMTask::giveup_current_region() { | |
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3448 assert(_curr_region != NULL, "invariant"); |
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3449 if (_cm->verbose_low()) { |
342 | 3450 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
3451 _task_id, _curr_region); | |
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3452 } |
342 | 3453 clear_region_fields(); |
3454 } | |
3455 | |
3456 void CMTask::clear_region_fields() { | |
3457 // Values for these three fields that indicate that we're not | |
3458 // holding on to a region. | |
3459 _curr_region = NULL; | |
3460 _finger = NULL; | |
3461 _region_limit = NULL; | |
3462 | |
3463 _region_finger = NULL; | |
3464 } | |
3465 | |
3771 | 3466 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3467 if (cm_oop_closure == NULL) { | |
3468 assert(_cm_oop_closure != NULL, "invariant"); | |
3469 } else { | |
3470 assert(_cm_oop_closure == NULL, "invariant"); | |
3471 } | |
3472 _cm_oop_closure = cm_oop_closure; | |
3473 } | |
3474 | |
342 | 3475 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3476 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3477 |
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3478 if (_cm->verbose_low()) { |
342 | 3479 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
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3480 } |
342 | 3481 |
3482 _nextMarkBitMap = nextMarkBitMap; | |
3483 clear_region_fields(); | |
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3484 assert(_aborted_region.is_empty(), "should have been cleared"); |
342 | 3485 |
3486 _calls = 0; | |
3487 _elapsed_time_ms = 0.0; | |
3488 _termination_time_ms = 0.0; | |
3489 _termination_start_time_ms = 0.0; | |
3490 | |
3491 #if _MARKING_STATS_ | |
3492 _local_pushes = 0; | |
3493 _local_pops = 0; | |
3494 _local_max_size = 0; | |
3495 _objs_scanned = 0; | |
3496 _global_pushes = 0; | |
3497 _global_pops = 0; | |
3498 _global_max_size = 0; | |
3499 _global_transfers_to = 0; | |
3500 _global_transfers_from = 0; | |
3501 _region_stack_pops = 0; | |
3502 _regions_claimed = 0; | |
3503 _objs_found_on_bitmap = 0; | |
3504 _satb_buffers_processed = 0; | |
3505 _steal_attempts = 0; | |
3506 _steals = 0; | |
3507 _aborted = 0; | |
3508 _aborted_overflow = 0; | |
3509 _aborted_cm_aborted = 0; | |
3510 _aborted_yield = 0; | |
3511 _aborted_timed_out = 0; | |
3512 _aborted_satb = 0; | |
3513 _aborted_termination = 0; | |
3514 #endif // _MARKING_STATS_ | |
3515 } | |
3516 | |
3517 bool CMTask::should_exit_termination() { | |
3518 regular_clock_call(); | |
3519 // This is called when we are in the termination protocol. We should | |
3520 // quit if, for some reason, this task wants to abort or the global | |
3521 // stack is not empty (this means that we can get work from it). | |
3522 return !_cm->mark_stack_empty() || has_aborted(); | |
3523 } | |
3524 | |
3525 void CMTask::reached_limit() { | |
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3526 assert(_words_scanned >= _words_scanned_limit || |
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3527 _refs_reached >= _refs_reached_limit , |
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3528 "shouldn't have been called otherwise"); |
342 | 3529 regular_clock_call(); |
3530 } | |
3531 | |
3532 void CMTask::regular_clock_call() { | |
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3533 if (has_aborted()) return; |
342 | 3534 |
3535 // First, we need to recalculate the words scanned and refs reached | |
3536 // limits for the next clock call. | |
3537 recalculate_limits(); | |
3538 | |
3539 // During the regular clock call we do the following | |
3540 | |
3541 // (1) If an overflow has been flagged, then we abort. | |
3542 if (_cm->has_overflown()) { | |
3543 set_has_aborted(); | |
3544 return; | |
3545 } | |
3546 | |
3547 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3548 // to check anything else. The other steps are only needed during | |
3549 // the concurrent marking phase. | |
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3550 if (!concurrent()) return; |
342 | 3551 |
3552 // (2) If marking has been aborted for Full GC, then we also abort. | |
3553 if (_cm->has_aborted()) { | |
3554 set_has_aborted(); | |
3555 statsOnly( ++_aborted_cm_aborted ); | |
3556 return; | |
3557 } | |
3558 | |
3559 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3560 | |
3561 // (3) If marking stats are enabled, then we update the step history. | |
3562 #if _MARKING_STATS_ | |
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3563 if (_words_scanned >= _words_scanned_limit) { |
342 | 3564 ++_clock_due_to_scanning; |
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3565 } |
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3566 if (_refs_reached >= _refs_reached_limit) { |
342 | 3567 ++_clock_due_to_marking; |
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3568 } |
342 | 3569 |
3570 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3571 _interval_start_time_ms = curr_time_ms; | |
3572 _all_clock_intervals_ms.add(last_interval_ms); | |
3573 | |
3574 if (_cm->verbose_medium()) { | |
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3575 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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3576 "scanned = %d%s, refs reached = %d%s", |
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3577 _task_id, last_interval_ms, |
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3578 _words_scanned, |
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3579 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3580 _refs_reached, |
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3581 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3582 } |
3583 #endif // _MARKING_STATS_ | |
3584 | |
3585 // (4) We check whether we should yield. If we have to, then we abort. | |
3586 if (_cm->should_yield()) { | |
3587 // We should yield. To do this we abort the task. The caller is | |
3588 // responsible for yielding. | |
3589 set_has_aborted(); | |
3590 statsOnly( ++_aborted_yield ); | |
3591 return; | |
3592 } | |
3593 | |
3594 // (5) We check whether we've reached our time quota. If we have, | |
3595 // then we abort. | |
3596 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3597 if (elapsed_time_ms > _time_target_ms) { | |
3598 set_has_aborted(); | |
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3599 _has_timed_out = true; |
342 | 3600 statsOnly( ++_aborted_timed_out ); |
3601 return; | |
3602 } | |
3603 | |
3604 // (6) Finally, we check whether there are enough completed STAB | |
3605 // buffers available for processing. If there are, we abort. | |
3606 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3607 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3608 if (_cm->verbose_low()) { |
342 | 3609 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
3610 _task_id); | |
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3611 } |
342 | 3612 // we do need to process SATB buffers, we'll abort and restart |
3613 // the marking task to do so | |
3614 set_has_aborted(); | |
3615 statsOnly( ++_aborted_satb ); | |
3616 return; | |
3617 } | |
3618 } | |
3619 | |
3620 void CMTask::recalculate_limits() { | |
3621 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3622 _words_scanned_limit = _real_words_scanned_limit; | |
3623 | |
3624 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3625 _refs_reached_limit = _real_refs_reached_limit; | |
3626 } | |
3627 | |
3628 void CMTask::decrease_limits() { | |
3629 // This is called when we believe that we're going to do an infrequent | |
3630 // operation which will increase the per byte scanned cost (i.e. move | |
3631 // entries to/from the global stack). It basically tries to decrease the | |
3632 // scanning limit so that the clock is called earlier. | |
3633 | |
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3634 if (_cm->verbose_medium()) { |
342 | 3635 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
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3636 } |
342 | 3637 |
3638 _words_scanned_limit = _real_words_scanned_limit - | |
3639 3 * words_scanned_period / 4; | |
3640 _refs_reached_limit = _real_refs_reached_limit - | |
3641 3 * refs_reached_period / 4; | |
3642 } | |
3643 | |
3644 void CMTask::move_entries_to_global_stack() { | |
3645 // local array where we'll store the entries that will be popped | |
3646 // from the local queue | |
3647 oop buffer[global_stack_transfer_size]; | |
3648 | |
3649 int n = 0; | |
3650 oop obj; | |
3651 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3652 buffer[n] = obj; | |
3653 ++n; | |
3654 } | |
3655 | |
3656 if (n > 0) { | |
3657 // we popped at least one entry from the local queue | |
3658 | |
3659 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3660 | |
3661 if (!_cm->mark_stack_push(buffer, n)) { | |
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3662 if (_cm->verbose_low()) { |
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3663 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
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3664 _task_id); |
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3665 } |
342 | 3666 set_has_aborted(); |
3667 } else { | |
3668 // the transfer was successful | |
3669 | |
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3670 if (_cm->verbose_medium()) { |
342 | 3671 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
3672 _task_id, n); | |
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3673 } |
342 | 3674 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3675 if (tmp_size > _global_max_size) { |
342 | 3676 _global_max_size = tmp_size; |
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3677 } |
342 | 3678 _global_pushes += n ); |
3679 } | |
3680 } | |
3681 | |
3682 // this operation was quite expensive, so decrease the limits | |
3683 decrease_limits(); | |
3684 } | |
3685 | |
3686 void CMTask::get_entries_from_global_stack() { | |
3687 // local array where we'll store the entries that will be popped | |
3688 // from the global stack. | |
3689 oop buffer[global_stack_transfer_size]; | |
3690 int n; | |
3691 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3692 assert(n <= global_stack_transfer_size, |
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3693 "we should not pop more than the given limit"); |
342 | 3694 if (n > 0) { |
3695 // yes, we did actually pop at least one entry | |
3696 | |
3697 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3698 if (_cm->verbose_medium()) { |
342 | 3699 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
3700 _task_id, n); | |
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3701 } |
342 | 3702 for (int i = 0; i < n; ++i) { |
3703 bool success = _task_queue->push(buffer[i]); | |
3704 // We only call this when the local queue is empty or under a | |
3705 // given target limit. So, we do not expect this push to fail. | |
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3706 assert(success, "invariant"); |
342 | 3707 } |
3708 | |
3709 statsOnly( int tmp_size = _task_queue->size(); | |
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3710 if (tmp_size > _local_max_size) { |
342 | 3711 _local_max_size = tmp_size; |
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3712 } |
342 | 3713 _local_pushes += n ); |
3714 } | |
3715 | |
3716 // this operation was quite expensive, so decrease the limits | |
3717 decrease_limits(); | |
3718 } | |
3719 | |
3720 void CMTask::drain_local_queue(bool partially) { | |
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3721 if (has_aborted()) return; |
342 | 3722 |
3723 // Decide what the target size is, depending whether we're going to | |
3724 // drain it partially (so that other tasks can steal if they run out | |
3725 // of things to do) or totally (at the very end). | |
3726 size_t target_size; | |
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3727 if (partially) { |
342 | 3728 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3729 } else { |
342 | 3730 target_size = 0; |
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3731 } |
342 | 3732 |
3733 if (_task_queue->size() > target_size) { | |
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3734 if (_cm->verbose_high()) { |
342 | 3735 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
3736 _task_id, target_size); | |
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3737 } |
342 | 3738 |
3739 oop obj; | |
3740 bool ret = _task_queue->pop_local(obj); | |
3741 while (ret) { | |
3742 statsOnly( ++_local_pops ); | |
3743 | |
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3744 if (_cm->verbose_high()) { |
342 | 3745 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
3746 (void*) obj); | |
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3747 } |
342 | 3748 |
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3749 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3750 assert(!_g1h->is_on_master_free_list( |
2152 | 3751 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3752 |
3753 scan_object(obj); | |
3754 | |
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3755 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3756 ret = false; |
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3757 } else { |
342 | 3758 ret = _task_queue->pop_local(obj); |
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3759 } |
342 | 3760 } |
3761 | |
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3762 if (_cm->verbose_high()) { |
342 | 3763 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
3764 _task_id, _task_queue->size()); | |
3776
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3765 } |
342 | 3766 } |
3767 } | |
3768 | |
3769 void CMTask::drain_global_stack(bool partially) { | |
3776
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3770 if (has_aborted()) return; |
342 | 3771 |
3772 // We have a policy to drain the local queue before we attempt to | |
3773 // drain the global stack. | |
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3774 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3775 |
3776 // Decide what the target size is, depending whether we're going to | |
3777 // drain it partially (so that other tasks can steal if they run out | |
3778 // of things to do) or totally (at the very end). Notice that, | |
3779 // because we move entries from the global stack in chunks or | |
3780 // because another task might be doing the same, we might in fact | |
3781 // drop below the target. But, this is not a problem. | |
3782 size_t target_size; | |
3776
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3783 if (partially) { |
342 | 3784 target_size = _cm->partial_mark_stack_size_target(); |
3776
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3785 } else { |
342 | 3786 target_size = 0; |
3776
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3787 } |
342 | 3788 |
3789 if (_cm->mark_stack_size() > target_size) { | |
3776
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3790 if (_cm->verbose_low()) { |
342 | 3791 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
3792 _task_id, target_size); | |
3776
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3793 } |
342 | 3794 |
3795 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3796 get_entries_from_global_stack(); | |
3797 drain_local_queue(partially); | |
3798 } | |
3799 | |
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3800 if (_cm->verbose_low()) { |
342 | 3801 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
3802 _task_id, _cm->mark_stack_size()); | |
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3803 } |
342 | 3804 } |
3805 } | |
3806 | |
3807 // SATB Queue has several assumptions on whether to call the par or | |
3808 // non-par versions of the methods. this is why some of the code is | |
3809 // replicated. We should really get rid of the single-threaded version | |
3810 // of the code to simplify things. | |
3811 void CMTask::drain_satb_buffers() { | |
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3812 if (has_aborted()) return; |
342 | 3813 |
3814 // We set this so that the regular clock knows that we're in the | |
3815 // middle of draining buffers and doesn't set the abort flag when it | |
3816 // notices that SATB buffers are available for draining. It'd be | |
3817 // very counter productive if it did that. :-) | |
3818 _draining_satb_buffers = true; | |
3819 | |
3820 CMObjectClosure oc(this); | |
3821 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3776
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3822 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3823 satb_mq_set.set_par_closure(_task_id, &oc); |
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3824 } else { |
342 | 3825 satb_mq_set.set_closure(&oc); |
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3826 } |
342 | 3827 |
3828 // This keeps claiming and applying the closure to completed buffers | |
3829 // until we run out of buffers or we need to abort. | |
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3830 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3831 while (!has_aborted() && |
3832 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
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3833 if (_cm->verbose_medium()) { |
342 | 3834 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
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3835 } |
342 | 3836 statsOnly( ++_satb_buffers_processed ); |
3837 regular_clock_call(); | |
3838 } | |
3839 } else { | |
3840 while (!has_aborted() && | |
3841 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3842 if (_cm->verbose_medium()) { |
342 | 3843 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
3776
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3844 } |
342 | 3845 statsOnly( ++_satb_buffers_processed ); |
3846 regular_clock_call(); | |
3847 } | |
3848 } | |
3849 | |
3850 if (!concurrent() && !has_aborted()) { | |
3851 // We should only do this during remark. | |
3776
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3852 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3853 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
3776
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3854 } else { |
342 | 3855 satb_mq_set.iterate_closure_all_threads(); |
3776
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3856 } |
342 | 3857 } |
3858 | |
3859 _draining_satb_buffers = false; | |
3860 | |
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3861 assert(has_aborted() || |
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3862 concurrent() || |
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3863 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3864 |
3776
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3865 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3866 satb_mq_set.set_par_closure(_task_id, NULL); |
3776
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3867 } else { |
342 | 3868 satb_mq_set.set_closure(NULL); |
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3869 } |
342 | 3870 |
3871 // again, this was a potentially expensive operation, decrease the | |
3872 // limits to get the regular clock call early | |
3873 decrease_limits(); | |
3874 } | |
3875 | |
3876 void CMTask::drain_region_stack(BitMapClosure* bc) { | |
3776
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3877 if (has_aborted()) return; |
342 | 3878 |
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3879 assert(_region_finger == NULL, |
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3880 "it should be NULL when we're not scanning a region"); |
342 | 3881 |
1835
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3882 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
3776
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3883 if (_cm->verbose_low()) { |
342 | 3884 gclog_or_tty->print_cr("[%d] draining region stack, size = %d", |
3885 _task_id, _cm->region_stack_size()); | |
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3886 } |
342 | 3887 |
1835
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3888 MemRegion mr; |
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3889 |
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3890 if (!_aborted_region.is_empty()) { |
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3891 mr = _aborted_region; |
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3892 _aborted_region = MemRegion(); |
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3893 |
3776
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3894 if (_cm->verbose_low()) { |
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3895 gclog_or_tty->print_cr("[%d] scanning aborted region " |
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3896 "[ " PTR_FORMAT ", " PTR_FORMAT " )", |
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3897 _task_id, mr.start(), mr.end()); |
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3898 } |
1835
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3899 } else { |
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3900 mr = _cm->region_stack_pop_lock_free(); |
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3901 // it returns MemRegion() if the pop fails |
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3902 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
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3903 } |
342 | 3904 |
3905 while (mr.start() != NULL) { | |
3776
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3906 if (_cm->verbose_medium()) { |
342 | 3907 gclog_or_tty->print_cr("[%d] we are scanning region " |
3908 "["PTR_FORMAT", "PTR_FORMAT")", | |
3909 _task_id, mr.start(), mr.end()); | |
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3910 } |
1835
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3911 |
1023
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3912 assert(mr.end() <= _cm->finger(), |
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3913 "otherwise the region shouldn't be on the stack"); |
342 | 3914 assert(!mr.is_empty(), "Only non-empty regions live on the region stack"); |
3915 if (_nextMarkBitMap->iterate(bc, mr)) { | |
1023
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3916 assert(!has_aborted(), |
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3917 "cannot abort the task without aborting the bitmap iteration"); |
342 | 3918 |
3919 // We finished iterating over the region without aborting. | |
3920 regular_clock_call(); | |
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3921 if (has_aborted()) { |
342 | 3922 mr = MemRegion(); |
3776
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3923 } else { |
1835
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3924 mr = _cm->region_stack_pop_lock_free(); |
342 | 3925 // it returns MemRegion() if the pop fails |
3926 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); | |
3927 } | |
3928 } else { | |
1023
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3929 assert(has_aborted(), "currently the only way to do so"); |
342 | 3930 |
3931 // The only way to abort the bitmap iteration is to return | |
3932 // false from the do_bit() method. However, inside the | |
3933 // do_bit() method we move the _region_finger to point to the | |
3934 // object currently being looked at. So, if we bail out, we | |
3935 // have definitely set _region_finger to something non-null. | |
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3936 assert(_region_finger != NULL, "invariant"); |
342 | 3937 |
1835
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3938 // Make sure that any previously aborted region has been |
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3939 // cleared. |
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3940 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
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3941 |
342 | 3942 // The iteration was actually aborted. So now _region_finger |
3943 // points to the address of the object we last scanned. If we | |
3944 // leave it there, when we restart this task, we will rescan | |
3945 // the object. It is easy to avoid this. We move the finger by | |
3946 // enough to point to the next possible object header (the | |
3947 // bitmap knows by how much we need to move it as it knows its | |
3948 // granularity). | |
3949 MemRegion newRegion = | |
3950 MemRegion(_nextMarkBitMap->nextWord(_region_finger), mr.end()); | |
3951 | |
3952 if (!newRegion.is_empty()) { | |
3953 if (_cm->verbose_low()) { | |
1835
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3954 gclog_or_tty->print_cr("[%d] recording unscanned region" |
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3955 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
342 | 3956 _task_id, |
3957 newRegion.start(), newRegion.end()); | |
3958 } | |
1835
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3959 // Now record the part of the region we didn't scan to |
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3960 // make sure this task scans it later. |
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3961 _aborted_region = newRegion; |
342 | 3962 } |
3963 // break from while | |
3964 mr = MemRegion(); | |
3965 } | |
3966 _region_finger = NULL; | |
3967 } | |
3968 | |
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3969 if (_cm->verbose_low()) { |
342 | 3970 gclog_or_tty->print_cr("[%d] drained region stack, size = %d", |
3971 _task_id, _cm->region_stack_size()); | |
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3972 } |
342 | 3973 } |
3974 } | |
3975 | |
3976 void CMTask::print_stats() { | |
3977 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
3978 _task_id, _calls); | |
3979 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
3980 _elapsed_time_ms, _termination_time_ms); | |
3981 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3982 _step_times_ms.num(), _step_times_ms.avg(), | |
3983 _step_times_ms.sd()); | |
3984 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3985 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3986 | |
3987 #if _MARKING_STATS_ | |
3988 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3989 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3990 _all_clock_intervals_ms.sd()); | |
3991 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3992 _all_clock_intervals_ms.maximum(), | |
3993 _all_clock_intervals_ms.sum()); | |
3994 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3995 _clock_due_to_scanning, _clock_due_to_marking); | |
3996 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3997 _objs_scanned, _objs_found_on_bitmap); | |
3998 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3999 _local_pushes, _local_pops, _local_max_size); | |
4000 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
4001 _global_pushes, _global_pops, _global_max_size); | |
4002 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
4003 _global_transfers_to,_global_transfers_from); | |
4004 gclog_or_tty->print_cr(" Regions: claimed = %d, Region Stack: pops = %d", | |
4005 _regions_claimed, _region_stack_pops); | |
4006 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); | |
4007 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
4008 _steal_attempts, _steals); | |
4009 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
4010 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
4011 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
4012 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
4013 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
4014 #endif // _MARKING_STATS_ | |
4015 } | |
4016 | |
4017 /***************************************************************************** | |
4018 | |
4019 The do_marking_step(time_target_ms) method is the building block | |
4020 of the parallel marking framework. It can be called in parallel | |
4021 with other invocations of do_marking_step() on different tasks | |
4022 (but only one per task, obviously) and concurrently with the | |
4023 mutator threads, or during remark, hence it eliminates the need | |
4024 for two versions of the code. When called during remark, it will | |
4025 pick up from where the task left off during the concurrent marking | |
4026 phase. Interestingly, tasks are also claimable during evacuation | |
4027 pauses too, since do_marking_step() ensures that it aborts before | |
4028 it needs to yield. | |
4029 | |
4030 The data structures that is uses to do marking work are the | |
4031 following: | |
4032 | |
4033 (1) Marking Bitmap. If there are gray objects that appear only | |
4034 on the bitmap (this happens either when dealing with an overflow | |
4035 or when the initial marking phase has simply marked the roots | |
4036 and didn't push them on the stack), then tasks claim heap | |
4037 regions whose bitmap they then scan to find gray objects. A | |
4038 global finger indicates where the end of the last claimed region | |
4039 is. A local finger indicates how far into the region a task has | |
4040 scanned. The two fingers are used to determine how to gray an | |
4041 object (i.e. whether simply marking it is OK, as it will be | |
4042 visited by a task in the future, or whether it needs to be also | |
4043 pushed on a stack). | |
4044 | |
4045 (2) Local Queue. The local queue of the task which is accessed | |
4046 reasonably efficiently by the task. Other tasks can steal from | |
4047 it when they run out of work. Throughout the marking phase, a | |
4048 task attempts to keep its local queue short but not totally | |
4049 empty, so that entries are available for stealing by other | |
4050 tasks. Only when there is no more work, a task will totally | |
4051 drain its local queue. | |
4052 | |
4053 (3) Global Mark Stack. This handles local queue overflow. During | |
4054 marking only sets of entries are moved between it and the local | |
4055 queues, as access to it requires a mutex and more fine-grain | |
4056 interaction with it which might cause contention. If it | |
4057 overflows, then the marking phase should restart and iterate | |
4058 over the bitmap to identify gray objects. Throughout the marking | |
4059 phase, tasks attempt to keep the global mark stack at a small | |
4060 length but not totally empty, so that entries are available for | |
4061 popping by other tasks. Only when there is no more work, tasks | |
4062 will totally drain the global mark stack. | |
4063 | |
4064 (4) Global Region Stack. Entries on it correspond to areas of | |
4065 the bitmap that need to be scanned since they contain gray | |
4066 objects. Pushes on the region stack only happen during | |
4067 evacuation pauses and typically correspond to areas covered by | |
4068 GC LABS. If it overflows, then the marking phase should restart | |
4069 and iterate over the bitmap to identify gray objects. Tasks will | |
4070 try to totally drain the region stack as soon as possible. | |
4071 | |
4072 (5) SATB Buffer Queue. This is where completed SATB buffers are | |
4073 made available. Buffers are regularly removed from this queue | |
4074 and scanned for roots, so that the queue doesn't get too | |
4075 long. During remark, all completed buffers are processed, as | |
4076 well as the filled in parts of any uncompleted buffers. | |
4077 | |
4078 The do_marking_step() method tries to abort when the time target | |
4079 has been reached. There are a few other cases when the | |
4080 do_marking_step() method also aborts: | |
4081 | |
4082 (1) When the marking phase has been aborted (after a Full GC). | |
4083 | |
4084 (2) When a global overflow (either on the global stack or the | |
4085 region stack) has been triggered. Before the task aborts, it | |
4086 will actually sync up with the other tasks to ensure that all | |
4087 the marking data structures (local queues, stacks, fingers etc.) | |
4088 are re-initialised so that when do_marking_step() completes, | |
4089 the marking phase can immediately restart. | |
4090 | |
4091 (3) When enough completed SATB buffers are available. The | |
4092 do_marking_step() method only tries to drain SATB buffers right | |
4093 at the beginning. So, if enough buffers are available, the | |
4094 marking step aborts and the SATB buffers are processed at | |
4095 the beginning of the next invocation. | |
4096 | |
4097 (4) To yield. when we have to yield then we abort and yield | |
4098 right at the end of do_marking_step(). This saves us from a lot | |
4099 of hassle as, by yielding we might allow a Full GC. If this | |
4100 happens then objects will be compacted underneath our feet, the | |
4101 heap might shrink, etc. We save checking for this by just | |
4102 aborting and doing the yield right at the end. | |
4103 | |
4104 From the above it follows that the do_marking_step() method should | |
4105 be called in a loop (or, otherwise, regularly) until it completes. | |
4106 | |
4107 If a marking step completes without its has_aborted() flag being | |
4108 true, it means it has completed the current marking phase (and | |
4109 also all other marking tasks have done so and have all synced up). | |
4110 | |
4111 A method called regular_clock_call() is invoked "regularly" (in | |
4112 sub ms intervals) throughout marking. It is this clock method that | |
4113 checks all the abort conditions which were mentioned above and | |
4114 decides when the task should abort. A work-based scheme is used to | |
4115 trigger this clock method: when the number of object words the | |
4116 marking phase has scanned or the number of references the marking | |
4117 phase has visited reach a given limit. Additional invocations to | |
4118 the method clock have been planted in a few other strategic places | |
4119 too. The initial reason for the clock method was to avoid calling | |
4120 vtime too regularly, as it is quite expensive. So, once it was in | |
4121 place, it was natural to piggy-back all the other conditions on it | |
4122 too and not constantly check them throughout the code. | |
4123 | |
4124 *****************************************************************************/ | |
4125 | |
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4126 void CMTask::do_marking_step(double time_target_ms, |
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4127 bool do_stealing, |
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4128 bool do_termination) { |
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4129 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4130 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4131 |
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4132 assert(concurrent() || _cm->region_stack_empty(), |
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4133 "the region stack should have been cleared before remark"); |
1835
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4134 assert(concurrent() || !_cm->has_aborted_regions(), |
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4135 "aborted regions should have been cleared before remark"); |
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4136 assert(_region_finger == NULL, |
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4137 "this should be non-null only when a region is being scanned"); |
342 | 4138 |
4139 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
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4140 assert(_task_queues != NULL, "invariant"); |
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4141 assert(_task_queue != NULL, "invariant"); |
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4142 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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4143 |
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4144 assert(!_claimed, |
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4145 "only one thread should claim this task at any one time"); |
342 | 4146 |
4147 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4148 // possible for two threads to set the _claimed flag at the same | |
4149 // time. But it is only for debugging purposes anyway and it will | |
4150 // catch most problems. | |
4151 _claimed = true; | |
4152 | |
4153 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4154 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4155 | |
4156 double diff_prediction_ms = | |
4157 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4158 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4159 | |
4160 // set up the variables that are used in the work-based scheme to | |
4161 // call the regular clock method | |
4162 _words_scanned = 0; | |
4163 _refs_reached = 0; | |
4164 recalculate_limits(); | |
4165 | |
4166 // clear all flags | |
4167 clear_has_aborted(); | |
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4168 _has_timed_out = false; |
342 | 4169 _draining_satb_buffers = false; |
4170 | |
4171 ++_calls; | |
4172 | |
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4173 if (_cm->verbose_low()) { |
342 | 4174 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
4175 "target = %1.2lfms >>>>>>>>>>", | |
4176 _task_id, _calls, _time_target_ms); | |
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4177 } |
342 | 4178 |
4179 // Set up the bitmap and oop closures. Anything that uses them is | |
4180 // eventually called from this method, so it is OK to allocate these | |
4181 // statically. | |
4182 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4183 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4184 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4185 |
4186 if (_cm->has_overflown()) { | |
4187 // This can happen if the region stack or the mark stack overflows | |
4188 // during a GC pause and this task, after a yield point, | |
4189 // restarts. We have to abort as we need to get into the overflow | |
4190 // protocol which happens right at the end of this task. | |
4191 set_has_aborted(); | |
4192 } | |
4193 | |
4194 // First drain any available SATB buffers. After this, we will not | |
4195 // look at SATB buffers before the next invocation of this method. | |
4196 // If enough completed SATB buffers are queued up, the regular clock | |
4197 // will abort this task so that it restarts. | |
4198 drain_satb_buffers(); | |
4199 // ...then partially drain the local queue and the global stack | |
4200 drain_local_queue(true); | |
4201 drain_global_stack(true); | |
4202 | |
4203 // Then totally drain the region stack. We will not look at | |
4204 // it again before the next invocation of this method. Entries on | |
4205 // the region stack are only added during evacuation pauses, for | |
4206 // which we have to yield. When we do, we abort the task anyway so | |
4207 // it will look at the region stack again when it restarts. | |
4208 bitmap_closure.set_scanning_heap_region(false); | |
4209 drain_region_stack(&bitmap_closure); | |
4210 // ...then partially drain the local queue and the global stack | |
4211 drain_local_queue(true); | |
4212 drain_global_stack(true); | |
4213 | |
4214 do { | |
4215 if (!has_aborted() && _curr_region != NULL) { | |
4216 // This means that we're already holding on to a region. | |
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4217 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4218 "should not be NULL either"); |
342 | 4219 |
4220 // We might have restarted this task after an evacuation pause | |
4221 // which might have evacuated the region we're holding on to | |
4222 // underneath our feet. Let's read its limit again to make sure | |
4223 // that we do not iterate over a region of the heap that | |
4224 // contains garbage (update_region_limit() will also move | |
4225 // _finger to the start of the region if it is found empty). | |
4226 update_region_limit(); | |
4227 // We will start from _finger not from the start of the region, | |
4228 // as we might be restarting this task after aborting half-way | |
4229 // through scanning this region. In this case, _finger points to | |
4230 // the address where we last found a marked object. If this is a | |
4231 // fresh region, _finger points to start(). | |
4232 MemRegion mr = MemRegion(_finger, _region_limit); | |
4233 | |
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4234 if (_cm->verbose_low()) { |
342 | 4235 gclog_or_tty->print_cr("[%d] we're scanning part " |
4236 "["PTR_FORMAT", "PTR_FORMAT") " | |
4237 "of region "PTR_FORMAT, | |
4238 _task_id, _finger, _region_limit, _curr_region); | |
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4239 } |
342 | 4240 |
4241 // Let's iterate over the bitmap of the part of the | |
4242 // region that is left. | |
4243 bitmap_closure.set_scanning_heap_region(true); | |
4244 if (mr.is_empty() || | |
4245 _nextMarkBitMap->iterate(&bitmap_closure, mr)) { | |
4246 // We successfully completed iterating over the region. Now, | |
4247 // let's give up the region. | |
4248 giveup_current_region(); | |
4249 regular_clock_call(); | |
4250 } else { | |
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4251 assert(has_aborted(), "currently the only way to do so"); |
342 | 4252 // The only way to abort the bitmap iteration is to return |
4253 // false from the do_bit() method. However, inside the | |
4254 // do_bit() method we move the _finger to point to the | |
4255 // object currently being looked at. So, if we bail out, we | |
4256 // have definitely set _finger to something non-null. | |
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4257 assert(_finger != NULL, "invariant"); |
342 | 4258 |
4259 // Region iteration was actually aborted. So now _finger | |
4260 // points to the address of the object we last scanned. If we | |
4261 // leave it there, when we restart this task, we will rescan | |
4262 // the object. It is easy to avoid this. We move the finger by | |
4263 // enough to point to the next possible object header (the | |
4264 // bitmap knows by how much we need to move it as it knows its | |
4265 // granularity). | |
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4266 assert(_finger < _region_limit, "invariant"); |
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4267 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
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4268 // Check if bitmap iteration was aborted while scanning the last object |
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4269 if (new_finger >= _region_limit) { |
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4270 giveup_current_region(); |
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4271 } else { |
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4272 move_finger_to(new_finger); |
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4273 } |
342 | 4274 } |
4275 } | |
4276 // At this point we have either completed iterating over the | |
4277 // region we were holding on to, or we have aborted. | |
4278 | |
4279 // We then partially drain the local queue and the global stack. | |
4280 // (Do we really need this?) | |
4281 drain_local_queue(true); | |
4282 drain_global_stack(true); | |
4283 | |
4284 // Read the note on the claim_region() method on why it might | |
4285 // return NULL with potentially more regions available for | |
4286 // claiming and why we have to check out_of_regions() to determine | |
4287 // whether we're done or not. | |
4288 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4289 // We are going to try to claim a new region. We should have | |
4290 // given up on the previous one. | |
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4291 // Separated the asserts so that we know which one fires. |
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4292 assert(_curr_region == NULL, "invariant"); |
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4293 assert(_finger == NULL, "invariant"); |
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4294 assert(_region_limit == NULL, "invariant"); |
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4295 if (_cm->verbose_low()) { |
342 | 4296 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
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4297 } |
342 | 4298 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
4299 if (claimed_region != NULL) { | |
4300 // Yes, we managed to claim one | |
4301 statsOnly( ++_regions_claimed ); | |
4302 | |
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4303 if (_cm->verbose_low()) { |
342 | 4304 gclog_or_tty->print_cr("[%d] we successfully claimed " |
4305 "region "PTR_FORMAT, | |
4306 _task_id, claimed_region); | |
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4307 } |
342 | 4308 |
4309 setup_for_region(claimed_region); | |
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4310 assert(_curr_region == claimed_region, "invariant"); |
342 | 4311 } |
4312 // It is important to call the regular clock here. It might take | |
4313 // a while to claim a region if, for example, we hit a large | |
4314 // block of empty regions. So we need to call the regular clock | |
4315 // method once round the loop to make sure it's called | |
4316 // frequently enough. | |
4317 regular_clock_call(); | |
4318 } | |
4319 | |
4320 if (!has_aborted() && _curr_region == NULL) { | |
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4321 assert(_cm->out_of_regions(), |
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4322 "at this point we should be out of regions"); |
342 | 4323 } |
4324 } while ( _curr_region != NULL && !has_aborted()); | |
4325 | |
4326 if (!has_aborted()) { | |
4327 // We cannot check whether the global stack is empty, since other | |
343
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4328 // tasks might be pushing objects to it concurrently. We also cannot |
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4329 // check if the region stack is empty because if a thread is aborting |
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4330 // it can push a partially done region back. |
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4331 assert(_cm->out_of_regions(), |
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4332 "at this point we should be out of regions"); |
342 | 4333 |
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4334 if (_cm->verbose_low()) { |
342 | 4335 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
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4336 } |
342 | 4337 |
4338 // Try to reduce the number of available SATB buffers so that | |
4339 // remark has less work to do. | |
4340 drain_satb_buffers(); | |
4341 } | |
4342 | |
4343 // Since we've done everything else, we can now totally drain the | |
4344 // local queue and global stack. | |
4345 drain_local_queue(false); | |
4346 drain_global_stack(false); | |
4347 | |
4348 // Attempt at work stealing from other task's queues. | |
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|
4349 if (do_stealing && !has_aborted()) { |
342 | 4350 // We have not aborted. This means that we have finished all that |
4351 // we could. Let's try to do some stealing... | |
4352 | |
4353 // We cannot check whether the global stack is empty, since other | |
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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342
diff
changeset
|
4354 // 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
|
4355 // check if the region stack is empty because if a thread is aborting |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
parents:
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diff
changeset
|
4356 // it can push a partially done region back. |
1023
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|
4357 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
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|
4358 "only way to reach here"); |
342 | 4359 |
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|
4360 if (_cm->verbose_low()) { |
342 | 4361 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
3776
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|
4362 } |
342 | 4363 |
4364 while (!has_aborted()) { | |
4365 oop obj; | |
4366 statsOnly( ++_steal_attempts ); | |
4367 | |
4368 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
3776
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|
4369 if (_cm->verbose_medium()) { |
342 | 4370 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
4371 _task_id, (void*) obj); | |
3776
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|
4372 } |
342 | 4373 |
4374 statsOnly( ++_steals ); | |
4375 | |
1023
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|
4376 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
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|
4377 "any stolen object should be marked"); |
342 | 4378 scan_object(obj); |
4379 | |
4380 // And since we're towards the end, let's totally drain the | |
4381 // local queue and global stack. | |
4382 drain_local_queue(false); | |
4383 drain_global_stack(false); | |
4384 } else { | |
4385 break; | |
4386 } | |
4387 } | |
4388 } | |
4389 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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diff
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|
4390 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4391 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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diff
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|
4392 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4393 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
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|
4394 _cm->set_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4395 regular_clock_call(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
4396 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4397 } |
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|
4398 |
342 | 4399 // We still haven't aborted. Now, let's try to get into the |
4400 // termination protocol. | |
2174
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|
4401 if (do_termination && !has_aborted()) { |
342 | 4402 // 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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|
4403 // 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
changeset
|
4404 // 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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|
4405 // it can push a partially done region back. |
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|
4406 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
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|
4407 assert(_cm->out_of_regions(), "only way to reach here"); |
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|
4408 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4409 |
3776
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|
4410 if (_cm->verbose_low()) { |
342 | 4411 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
3776
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|
4412 } |
342 | 4413 |
4414 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
4415 // The CMTask class also extends the TerminatorTerminator class, | |
4416 // hence its should_exit_termination() method will also decide | |
4417 // whether to exit the termination protocol or not. | |
4418 bool finished = _cm->terminator()->offer_termination(this); | |
4419 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
4420 _termination_time_ms += | |
4421 termination_end_time_ms - _termination_start_time_ms; | |
4422 | |
4423 if (finished) { | |
4424 // We're all done. | |
4425 | |
4426 if (_task_id == 0) { | |
4427 // let's allow task 0 to do this | |
4428 if (concurrent()) { | |
1023
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|
4429 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4430 // we need to set this to false before the next |
4431 // safepoint. This way we ensure that the marking phase | |
4432 // doesn't observe any more heap expansions. | |
4433 _cm->clear_concurrent_marking_in_progress(); | |
4434 } | |
4435 } | |
4436 | |
4437 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
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|
4438 // all other tasks have finished. We separated the guarantees so |
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|
4439 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
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|
4440 // which one. |
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|
4441 guarantee(_cm->out_of_regions(), "only way to reach here"); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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|
4442 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
1023
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changeset
|
4443 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
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|
4444 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
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|
4445 guarantee(_task_queue->size() == 0, "only way to reach here"); |
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|
4446 guarantee(!_cm->has_overflown(), "only way to reach here"); |
11d4857fe5e1
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changeset
|
4447 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
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|
4448 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
342 | 4449 |
3776
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|
4450 if (_cm->verbose_low()) { |
342 | 4451 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
3776
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|
4452 } |
342 | 4453 } else { |
4454 // Apparently there's more work to do. Let's abort this task. It | |
4455 // will restart it and we can hopefully find more things to do. | |
4456 | |
3776
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|
4457 if (_cm->verbose_low()) { |
23d434c6290d
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changeset
|
4458 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
23d434c6290d
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|
4459 _task_id); |
23d434c6290d
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|
4460 } |
342 | 4461 |
4462 set_has_aborted(); | |
4463 statsOnly( ++_aborted_termination ); | |
4464 } | |
4465 } | |
4466 | |
4467 // Mainly for debugging purposes to make sure that a pointer to the | |
4468 // closure which was statically allocated in this frame doesn't | |
4469 // escape it by accident. | |
3771 | 4470 set_cm_oop_closure(NULL); |
342 | 4471 double end_time_ms = os::elapsedVTime() * 1000.0; |
4472 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4473 // Update the step history. | |
4474 _step_times_ms.add(elapsed_time_ms); | |
4475 | |
4476 if (has_aborted()) { | |
4477 // The task was aborted for some reason. | |
4478 | |
4479 statsOnly( ++_aborted ); | |
4480 | |
2174
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|
4481 if (_has_timed_out) { |
342 | 4482 double diff_ms = elapsed_time_ms - _time_target_ms; |
4483 // Keep statistics of how well we did with respect to hitting | |
4484 // our target only if we actually timed out (if we aborted for | |
4485 // other reasons, then the results might get skewed). | |
4486 _marking_step_diffs_ms.add(diff_ms); | |
4487 } | |
4488 | |
4489 if (_cm->has_overflown()) { | |
4490 // This is the interesting one. We aborted because a global | |
4491 // overflow was raised. This means we have to restart the | |
4492 // marking phase and start iterating over regions. However, in | |
4493 // order to do this we have to make sure that all tasks stop | |
4494 // what they are doing and re-initialise in a safe manner. We | |
4495 // will achieve this with the use of two barrier sync points. | |
4496 | |
3776
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|
4497 if (_cm->verbose_low()) { |
342 | 4498 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
3776
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|
4499 } |
342 | 4500 |
4501 _cm->enter_first_sync_barrier(_task_id); | |
4502 // When we exit this sync barrier we know that all tasks have | |
4503 // stopped doing marking work. So, it's now safe to | |
4504 // re-initialise our data structures. At the end of this method, | |
4505 // task 0 will clear the global data structures. | |
4506 | |
4507 statsOnly( ++_aborted_overflow ); | |
4508 | |
4509 // We clear the local state of this task... | |
4510 clear_region_fields(); | |
4511 | |
4512 // ...and enter the second barrier. | |
4513 _cm->enter_second_sync_barrier(_task_id); | |
4514 // At this point everything has bee re-initialised and we're | |
4515 // ready to restart. | |
4516 } | |
4517 | |
4518 if (_cm->verbose_low()) { | |
4519 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
4520 "elapsed = %1.2lfms <<<<<<<<<<", | |
4521 _task_id, _time_target_ms, elapsed_time_ms); | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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changeset
|
4522 if (_cm->has_aborted()) { |
342 | 4523 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
4524 _task_id); | |
3776
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|
4525 } |
342 | 4526 } |
4527 } else { | |
3776
23d434c6290d
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changeset
|
4528 if (_cm->verbose_low()) { |
342 | 4529 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
4530 "elapsed = %1.2lfms <<<<<<<<<<", | |
4531 _task_id, _time_target_ms, elapsed_time_ms); | |
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|
4532 } |
342 | 4533 } |
4534 | |
4535 _claimed = false; | |
4536 } | |
4537 | |
4538 CMTask::CMTask(int task_id, | |
4539 ConcurrentMark* cm, | |
4540 CMTaskQueue* task_queue, | |
4541 CMTaskQueueSet* task_queues) | |
4542 : _g1h(G1CollectedHeap::heap()), | |
4543 _task_id(task_id), _cm(cm), | |
4544 _claimed(false), | |
4545 _nextMarkBitMap(NULL), _hash_seed(17), | |
4546 _task_queue(task_queue), | |
4547 _task_queues(task_queues), | |
3771 | 4548 _cm_oop_closure(NULL), |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
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|
4549 _aborted_region(MemRegion()) { |
1023
11d4857fe5e1
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diff
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|
4550 guarantee(task_queue != NULL, "invariant"); |
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changeset
|
4551 guarantee(task_queues != NULL, "invariant"); |
342 | 4552 |
4553 statsOnly( _clock_due_to_scanning = 0; | |
4554 _clock_due_to_marking = 0 ); | |
4555 | |
4556 _marking_step_diffs_ms.add(0.5); | |
4557 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4558 |
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|
4559 // These are formatting macros that are used below to ensure |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4560 // consistent formatting. The *_H_* versions are used to format the |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4561 // header for a particular value and they should be kept consistent |
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diff
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|
4562 // with the corresponding macro. Also note that most of the macros add |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4563 // 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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|
4564 // easier to compose. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4565 |
371bbc844bf1
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|
4566 // All the output lines are prefixed with this string to be able to |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4567 // 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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changeset
|
4568 #define G1PPRL_LINE_PREFIX "###" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4569 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4570 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4571 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4572 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
371bbc844bf1
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|
4573 #else // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4574 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4575 #endif // _LP64 |
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|
4576 |
371bbc844bf1
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|
4577 // For per-region info |
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|
4578 #define G1PPRL_TYPE_FORMAT " %-4s" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4579 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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|
4580 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4581 #define G1PPRL_BYTE_H_FORMAT " %9s" |
371bbc844bf1
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|
4582 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
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4583 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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|
4584 |
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|
4585 // For summary info |
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|
4586 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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4587 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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4588 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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|
4589 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4590 |
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|
4591 G1PrintRegionLivenessInfoClosure:: |
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4592 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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|
4593 : _out(out), |
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4594 _total_used_bytes(0), _total_capacity_bytes(0), |
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4595 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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4596 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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4597 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
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4598 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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4599 MemRegion g1_committed = g1h->g1_committed(); |
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4600 MemRegion g1_reserved = g1h->g1_reserved(); |
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4601 double now = os::elapsedTime(); |
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|
4602 |
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|
4603 // Print the header of the output. |
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|
4604 _out->cr(); |
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|
4605 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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4606 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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4607 G1PPRL_SUM_ADDR_FORMAT("committed") |
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4608 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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4609 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
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4610 g1_committed.start(), g1_committed.end(), |
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4611 g1_reserved.start(), g1_reserved.end(), |
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4612 HeapRegion::GrainBytes); |
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4613 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4614 _out->print_cr(G1PPRL_LINE_PREFIX |
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4615 G1PPRL_TYPE_H_FORMAT |
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4616 G1PPRL_ADDR_BASE_H_FORMAT |
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4617 G1PPRL_BYTE_H_FORMAT |
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4618 G1PPRL_BYTE_H_FORMAT |
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4619 G1PPRL_BYTE_H_FORMAT |
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4620 G1PPRL_DOUBLE_H_FORMAT, |
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4621 "type", "address-range", |
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4622 "used", "prev-live", "next-live", "gc-eff"); |
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|
4623 } |
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|
4624 |
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4625 // It takes as a parameter a reference to one of the _hum_* fields, it |
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4626 // deduces the corresponding value for a region in a humongous region |
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4627 // series (either the region size, or what's left if the _hum_* field |
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4628 // is < the region size), and updates the _hum_* field accordingly. |
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|
4629 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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4630 size_t bytes = 0; |
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4631 // The > 0 check is to deal with the prev and next live bytes which |
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4632 // could be 0. |
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4633 if (*hum_bytes > 0) { |
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|
4634 bytes = MIN2((size_t) HeapRegion::GrainBytes, *hum_bytes); |
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4635 *hum_bytes -= bytes; |
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|
4636 } |
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|
4637 return bytes; |
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|
4638 } |
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|
4639 |
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4640 // It deduces the values for a region in a humongous region series |
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4641 // from the _hum_* fields and updates those accordingly. It assumes |
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|
4642 // that that _hum_* fields have already been set up from the "starts |
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4643 // humongous" region and we visit the regions in address order. |
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|
4644 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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|
4645 size_t* capacity_bytes, |
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|
4646 size_t* prev_live_bytes, |
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|
4647 size_t* next_live_bytes) { |
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|
4648 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
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|
4649 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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4650 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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|
4651 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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|
4652 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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|
4653 } |
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|
4654 |
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|
4655 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
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|
4656 const char* type = ""; |
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|
4657 HeapWord* bottom = r->bottom(); |
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|
4658 HeapWord* end = r->end(); |
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|
4659 size_t capacity_bytes = r->capacity(); |
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|
4660 size_t used_bytes = r->used(); |
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|
4661 size_t prev_live_bytes = r->live_bytes(); |
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|
4662 size_t next_live_bytes = r->next_live_bytes(); |
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|
4663 double gc_eff = r->gc_efficiency(); |
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|
4664 if (r->used() == 0) { |
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|
4665 type = "FREE"; |
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|
4666 } else if (r->is_survivor()) { |
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|
4667 type = "SURV"; |
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|
4668 } else if (r->is_young()) { |
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|
4669 type = "EDEN"; |
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|
4670 } else if (r->startsHumongous()) { |
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|
4671 type = "HUMS"; |
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|
4672 |
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|
4673 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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|
4674 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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4675 "they should have been zeroed after the last time we used them"); |
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|
4676 // Set up the _hum_* fields. |
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|
4677 _hum_capacity_bytes = capacity_bytes; |
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|
4678 _hum_used_bytes = used_bytes; |
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|
4679 _hum_prev_live_bytes = prev_live_bytes; |
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|
4680 _hum_next_live_bytes = next_live_bytes; |
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|
4681 get_hum_bytes(&used_bytes, &capacity_bytes, |
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|
4682 &prev_live_bytes, &next_live_bytes); |
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4683 end = bottom + HeapRegion::GrainWords; |
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4684 } else if (r->continuesHumongous()) { |
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|
4685 type = "HUMC"; |
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|
4686 get_hum_bytes(&used_bytes, &capacity_bytes, |
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|
4687 &prev_live_bytes, &next_live_bytes); |
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|
4688 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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|
4689 } else { |
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|
4690 type = "OLD"; |
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|
4691 } |
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|
4692 |
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|
4693 _total_used_bytes += used_bytes; |
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|
4694 _total_capacity_bytes += capacity_bytes; |
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4695 _total_prev_live_bytes += prev_live_bytes; |
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4696 _total_next_live_bytes += next_live_bytes; |
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4697 |
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4698 // Print a line for this particular region. |
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4699 _out->print_cr(G1PPRL_LINE_PREFIX |
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4700 G1PPRL_TYPE_FORMAT |
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4701 G1PPRL_ADDR_BASE_FORMAT |
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4702 G1PPRL_BYTE_FORMAT |
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4703 G1PPRL_BYTE_FORMAT |
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4704 G1PPRL_BYTE_FORMAT |
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4705 G1PPRL_DOUBLE_FORMAT, |
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4706 type, bottom, end, |
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4707 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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4708 |
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4709 return false; |
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|
4710 } |
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|
4711 |
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4712 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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4713 // Print the footer of the output. |
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4714 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4715 _out->print_cr(G1PPRL_LINE_PREFIX |
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4716 " SUMMARY" |
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4717 G1PPRL_SUM_MB_FORMAT("capacity") |
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4718 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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4719 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
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4720 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
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4721 bytes_to_mb(_total_capacity_bytes), |
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4722 bytes_to_mb(_total_used_bytes), |
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4723 perc(_total_used_bytes, _total_capacity_bytes), |
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4724 bytes_to_mb(_total_prev_live_bytes), |
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4725 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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4726 bytes_to_mb(_total_next_live_bytes), |
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4727 perc(_total_next_live_bytes, _total_capacity_bytes)); |
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4728 _out->cr(); |
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4729 } |