Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 4982:38012b8c29b1
create separate RUNTIME1_STUBS definition for non-graal build.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 27 Feb 2012 22:18:57 +0100 |
parents | eff609af17d7 |
children | 2a0172480595 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
3771 | 32 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
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34 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 35 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
36 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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37 #include "gc_implementation/shared/vmGCOperations.hpp" |
1972 | 38 #include "memory/genOopClosures.inline.hpp" |
39 #include "memory/referencePolicy.hpp" | |
40 #include "memory/resourceArea.hpp" | |
41 #include "oops/oop.inline.hpp" | |
42 #include "runtime/handles.inline.hpp" | |
43 #include "runtime/java.hpp" | |
342 | 44 |
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45 // Concurrent marking bit map wrapper |
342 | 46 |
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47 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
342 | 48 _bm((uintptr_t*)NULL,0), |
49 _shifter(shifter) { | |
50 _bmStartWord = (HeapWord*)(rs.base()); | |
51 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
52 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
53 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
54 | |
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55 guarantee(brs.is_reserved(), "couldn't allocate concurrent marking bit map"); |
342 | 56 // For now we'll just commit all of the bit map up fromt. |
57 // Later on we'll try to be more parsimonious with swap. | |
58 guarantee(_virtual_space.initialize(brs, brs.size()), | |
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59 "couldn't reseve backing store for concurrent marking bit map"); |
342 | 60 assert(_virtual_space.committed_size() == brs.size(), |
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61 "didn't reserve backing store for all of concurrent marking bit map?"); |
342 | 62 _bm.set_map((uintptr_t*)_virtual_space.low()); |
63 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
64 _bmWordSize, "inconsistency in bit map sizing"); | |
65 _bm.set_size(_bmWordSize >> _shifter); | |
66 } | |
67 | |
68 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
69 HeapWord* limit) const { | |
70 // First we must round addr *up* to a possible object boundary. | |
71 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
72 HeapWordSize << _shifter); | |
73 size_t addrOffset = heapWordToOffset(addr); | |
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74 if (limit == NULL) { |
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75 limit = _bmStartWord + _bmWordSize; |
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76 } |
342 | 77 size_t limitOffset = heapWordToOffset(limit); |
78 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
79 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
80 assert(nextAddr >= addr, "get_next_one postcondition"); | |
81 assert(nextAddr == limit || isMarked(nextAddr), | |
82 "get_next_one postcondition"); | |
83 return nextAddr; | |
84 } | |
85 | |
86 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
87 HeapWord* limit) const { | |
88 size_t addrOffset = heapWordToOffset(addr); | |
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89 if (limit == NULL) { |
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90 limit = _bmStartWord + _bmWordSize; |
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91 } |
342 | 92 size_t limitOffset = heapWordToOffset(limit); |
93 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
94 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
95 assert(nextAddr >= addr, "get_next_one postcondition"); | |
96 assert(nextAddr == limit || !isMarked(nextAddr), | |
97 "get_next_one postcondition"); | |
98 return nextAddr; | |
99 } | |
100 | |
101 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
102 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
103 return (int) (diff >> _shifter); | |
104 } | |
105 | |
106 void CMBitMapRO::mostly_disjoint_range_union(BitMap* from_bitmap, | |
107 size_t from_start_index, | |
108 HeapWord* to_start_word, | |
109 size_t word_num) { | |
110 _bm.mostly_disjoint_range_union(from_bitmap, | |
111 from_start_index, | |
112 heapWordToOffset(to_start_word), | |
113 word_num); | |
114 } | |
115 | |
116 #ifndef PRODUCT | |
117 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
118 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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119 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
342 | 120 "size inconsistency"); |
121 return _bmStartWord == (HeapWord*)(rs.base()) && | |
122 _bmWordSize == rs.size()>>LogHeapWordSize; | |
123 } | |
124 #endif | |
125 | |
126 void CMBitMap::clearAll() { | |
127 _bm.clear(); | |
128 return; | |
129 } | |
130 | |
131 void CMBitMap::markRange(MemRegion mr) { | |
132 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
133 assert(!mr.is_empty(), "unexpected empty region"); | |
134 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
135 ((HeapWord *) mr.end())), | |
136 "markRange memory region end is not card aligned"); | |
137 // convert address range into offset range | |
138 _bm.at_put_range(heapWordToOffset(mr.start()), | |
139 heapWordToOffset(mr.end()), true); | |
140 } | |
141 | |
142 void CMBitMap::clearRange(MemRegion mr) { | |
143 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
144 assert(!mr.is_empty(), "unexpected empty region"); | |
145 // convert address range into offset range | |
146 _bm.at_put_range(heapWordToOffset(mr.start()), | |
147 heapWordToOffset(mr.end()), false); | |
148 } | |
149 | |
150 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
151 HeapWord* end_addr) { | |
152 HeapWord* start = getNextMarkedWordAddress(addr); | |
153 start = MIN2(start, end_addr); | |
154 HeapWord* end = getNextUnmarkedWordAddress(start); | |
155 end = MIN2(end, end_addr); | |
156 assert(start <= end, "Consistency check"); | |
157 MemRegion mr(start, end); | |
158 if (!mr.is_empty()) { | |
159 clearRange(mr); | |
160 } | |
161 return mr; | |
162 } | |
163 | |
164 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
165 _base(NULL), _cm(cm) | |
166 #ifdef ASSERT | |
167 , _drain_in_progress(false) | |
168 , _drain_in_progress_yields(false) | |
169 #endif | |
170 {} | |
171 | |
172 void CMMarkStack::allocate(size_t size) { | |
173 _base = NEW_C_HEAP_ARRAY(oop, size); | |
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174 if (_base == NULL) { |
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175 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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176 } |
342 | 177 _index = 0; |
178 _capacity = (jint) size; | |
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179 _saved_index = -1; |
342 | 180 NOT_PRODUCT(_max_depth = 0); |
181 } | |
182 | |
183 CMMarkStack::~CMMarkStack() { | |
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184 if (_base != NULL) { |
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185 FREE_C_HEAP_ARRAY(oop, _base); |
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186 } |
342 | 187 } |
188 | |
189 void CMMarkStack::par_push(oop ptr) { | |
190 while (true) { | |
191 if (isFull()) { | |
192 _overflow = true; | |
193 return; | |
194 } | |
195 // Otherwise... | |
196 jint index = _index; | |
197 jint next_index = index+1; | |
198 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
199 if (res == index) { | |
200 _base[index] = ptr; | |
201 // Note that we don't maintain this atomically. We could, but it | |
202 // doesn't seem necessary. | |
203 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
204 return; | |
205 } | |
206 // Otherwise, we need to try again. | |
207 } | |
208 } | |
209 | |
210 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
211 while (true) { | |
212 if (isFull()) { | |
213 _overflow = true; | |
214 return; | |
215 } | |
216 // Otherwise... | |
217 jint index = _index; | |
218 jint next_index = index + n; | |
219 if (next_index > _capacity) { | |
220 _overflow = true; | |
221 return; | |
222 } | |
223 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
224 if (res == index) { | |
225 for (int i = 0; i < n; i++) { | |
226 int ind = index + i; | |
227 assert(ind < _capacity, "By overflow test above."); | |
228 _base[ind] = ptr_arr[i]; | |
229 } | |
230 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
231 return; | |
232 } | |
233 // Otherwise, we need to try again. | |
234 } | |
235 } | |
236 | |
237 | |
238 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
239 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
240 jint start = _index; | |
241 jint next_index = start + n; | |
242 if (next_index > _capacity) { | |
243 _overflow = true; | |
244 return; | |
245 } | |
246 // Otherwise. | |
247 _index = next_index; | |
248 for (int i = 0; i < n; i++) { | |
249 int ind = start + i; | |
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250 assert(ind < _capacity, "By overflow test above."); |
342 | 251 _base[ind] = ptr_arr[i]; |
252 } | |
253 } | |
254 | |
255 | |
256 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
257 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
258 jint index = _index; | |
259 if (index == 0) { | |
260 *n = 0; | |
261 return false; | |
262 } else { | |
263 int k = MIN2(max, index); | |
264 jint new_ind = index - k; | |
265 for (int j = 0; j < k; j++) { | |
266 ptr_arr[j] = _base[new_ind + j]; | |
267 } | |
268 _index = new_ind; | |
269 *n = k; | |
270 return true; | |
271 } | |
272 } | |
273 | |
274 CMRegionStack::CMRegionStack() : _base(NULL) {} | |
275 | |
276 void CMRegionStack::allocate(size_t size) { | |
277 _base = NEW_C_HEAP_ARRAY(MemRegion, size); | |
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278 if (_base == NULL) { |
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279 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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280 } |
342 | 281 _index = 0; |
282 _capacity = (jint) size; | |
283 } | |
284 | |
285 CMRegionStack::~CMRegionStack() { | |
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286 if (_base != NULL) { |
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287 FREE_C_HEAP_ARRAY(oop, _base); |
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288 } |
342 | 289 } |
290 | |
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291 void CMRegionStack::push_lock_free(MemRegion mr) { |
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292 guarantee(false, "push_lock_free(): don't call this any more"); |
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293 |
342 | 294 assert(mr.word_size() > 0, "Precondition"); |
295 while (true) { | |
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296 jint index = _index; |
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297 |
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298 if (index >= _capacity) { |
342 | 299 _overflow = true; |
300 return; | |
301 } | |
302 // Otherwise... | |
303 jint next_index = index+1; | |
304 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
305 if (res == index) { | |
306 _base[index] = mr; | |
307 return; | |
308 } | |
309 // Otherwise, we need to try again. | |
310 } | |
311 } | |
312 | |
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313 // Lock-free pop of the region stack. Called during the concurrent |
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314 // marking / remark phases. Should only be called in tandem with |
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315 // other lock-free pops. |
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316 MemRegion CMRegionStack::pop_lock_free() { |
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317 guarantee(false, "pop_lock_free(): don't call this any more"); |
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318 |
342 | 319 while (true) { |
320 jint index = _index; | |
321 | |
322 if (index == 0) { | |
323 return MemRegion(); | |
324 } | |
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325 // Otherwise... |
342 | 326 jint next_index = index-1; |
327 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
328 if (res == index) { | |
329 MemRegion mr = _base[next_index]; | |
330 if (mr.start() != NULL) { | |
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331 assert(mr.end() != NULL, "invariant"); |
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332 assert(mr.word_size() > 0, "invariant"); |
342 | 333 return mr; |
334 } else { | |
335 // that entry was invalidated... let's skip it | |
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336 assert(mr.end() == NULL, "invariant"); |
342 | 337 } |
338 } | |
339 // Otherwise, we need to try again. | |
340 } | |
341 } | |
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342 |
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343 #if 0 |
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344 // The routines that manipulate the region stack with a lock are |
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345 // not currently used. They should be retained, however, as a |
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346 // diagnostic aid. |
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347 |
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348 void CMRegionStack::push_with_lock(MemRegion mr) { |
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349 assert(mr.word_size() > 0, "Precondition"); |
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350 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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351 |
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352 if (isFull()) { |
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353 _overflow = true; |
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354 return; |
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355 } |
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356 |
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357 _base[_index] = mr; |
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358 _index += 1; |
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359 } |
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360 |
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361 MemRegion CMRegionStack::pop_with_lock() { |
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362 MutexLockerEx x(CMRegionStack_lock, Mutex::_no_safepoint_check_flag); |
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363 |
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364 while (true) { |
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365 if (_index == 0) { |
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366 return MemRegion(); |
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367 } |
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368 _index -= 1; |
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369 |
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370 MemRegion mr = _base[_index]; |
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371 if (mr.start() != NULL) { |
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372 assert(mr.end() != NULL, "invariant"); |
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373 assert(mr.word_size() > 0, "invariant"); |
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374 return mr; |
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375 } else { |
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376 // that entry was invalidated... let's skip it |
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377 assert(mr.end() == NULL, "invariant"); |
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378 } |
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379 } |
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380 } |
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381 #endif |
342 | 382 |
383 bool CMRegionStack::invalidate_entries_into_cset() { | |
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384 guarantee(false, "invalidate_entries_into_cset(): don't call this any more"); |
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385 |
342 | 386 bool result = false; |
387 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
388 for (int i = 0; i < _oops_do_bound; ++i) { | |
389 MemRegion mr = _base[i]; | |
390 if (mr.start() != NULL) { | |
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391 assert(mr.end() != NULL, "invariant"); |
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392 assert(mr.word_size() > 0, "invariant"); |
342 | 393 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
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394 assert(hr != NULL, "invariant"); |
342 | 395 if (hr->in_collection_set()) { |
396 // The region points into the collection set | |
397 _base[i] = MemRegion(); | |
398 result = true; | |
399 } | |
400 } else { | |
401 // that entry was invalidated... let's skip it | |
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402 assert(mr.end() == NULL, "invariant"); |
342 | 403 } |
404 } | |
405 return result; | |
406 } | |
407 | |
408 template<class OopClosureClass> | |
409 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
410 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
411 || SafepointSynchronize::is_at_safepoint(), | |
412 "Drain recursion must be yield-safe."); | |
413 bool res = true; | |
414 debug_only(_drain_in_progress = true); | |
415 debug_only(_drain_in_progress_yields = yield_after); | |
416 while (!isEmpty()) { | |
417 oop newOop = pop(); | |
418 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
419 assert(newOop->is_oop(), "Expected an oop"); | |
420 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
421 "only grey objects on this stack"); | |
422 newOop->oop_iterate(cl); | |
423 if (yield_after && _cm->do_yield_check()) { | |
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424 res = false; |
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425 break; |
342 | 426 } |
427 } | |
428 debug_only(_drain_in_progress = false); | |
429 return res; | |
430 } | |
431 | |
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432 void CMMarkStack::note_start_of_gc() { |
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433 assert(_saved_index == -1, |
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434 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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435 _saved_index = _index; |
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436 } |
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437 |
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438 void CMMarkStack::note_end_of_gc() { |
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439 // This is intentionally a guarantee, instead of an assert. If we |
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440 // accidentally add something to the mark stack during GC, it |
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441 // will be a correctness issue so it's better if we crash. we'll |
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442 // only check this once per GC anyway, so it won't be a performance |
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443 // issue in any way. |
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444 guarantee(_saved_index == _index, |
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445 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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446 _saved_index = -1; |
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447 } |
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448 |
342 | 449 void CMMarkStack::oops_do(OopClosure* f) { |
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450 assert(_saved_index == _index, |
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451 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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452 for (int i = 0; i < _index; i += 1) { |
342 | 453 f->do_oop(&_base[i]); |
454 } | |
455 } | |
456 | |
457 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
458 return (_g1h->is_obj_ill(obj) | |
459 || (_g1h->is_in_permanent(obj) | |
460 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
461 } | |
462 | |
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463 CMRootRegions::CMRootRegions() : |
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464 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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465 _should_abort(false), _next_survivor(NULL) { } |
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466 |
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467 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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468 _young_list = g1h->young_list(); |
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469 _cm = cm; |
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470 } |
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471 |
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472 void CMRootRegions::prepare_for_scan() { |
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473 assert(!scan_in_progress(), "pre-condition"); |
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474 |
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475 // Currently, only survivors can be root regions. |
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476 assert(_next_survivor == NULL, "pre-condition"); |
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477 _next_survivor = _young_list->first_survivor_region(); |
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478 _scan_in_progress = (_next_survivor != NULL); |
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479 _should_abort = false; |
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480 } |
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481 |
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482 HeapRegion* CMRootRegions::claim_next() { |
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483 if (_should_abort) { |
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484 // If someone has set the should_abort flag, we return NULL to |
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485 // force the caller to bail out of their loop. |
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486 return NULL; |
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487 } |
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488 |
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489 // Currently, only survivors can be root regions. |
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490 HeapRegion* res = _next_survivor; |
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491 if (res != NULL) { |
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492 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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493 // Read it again in case it changed while we were waiting for the lock. |
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494 res = _next_survivor; |
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495 if (res != NULL) { |
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496 if (res == _young_list->last_survivor_region()) { |
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497 // We just claimed the last survivor so store NULL to indicate |
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498 // that we're done. |
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499 _next_survivor = NULL; |
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500 } else { |
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501 _next_survivor = res->get_next_young_region(); |
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502 } |
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503 } else { |
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504 // Someone else claimed the last survivor while we were trying |
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505 // to take the lock so nothing else to do. |
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506 } |
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507 } |
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508 assert(res == NULL || res->is_survivor(), "post-condition"); |
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509 |
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510 return res; |
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511 } |
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512 |
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513 void CMRootRegions::scan_finished() { |
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514 assert(scan_in_progress(), "pre-condition"); |
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515 |
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516 // Currently, only survivors can be root regions. |
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517 if (!_should_abort) { |
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518 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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519 } |
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520 _next_survivor = NULL; |
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521 |
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522 { |
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523 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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524 _scan_in_progress = false; |
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525 RootRegionScan_lock->notify_all(); |
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526 } |
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527 } |
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528 |
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529 bool CMRootRegions::wait_until_scan_finished() { |
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530 if (!scan_in_progress()) return false; |
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531 |
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532 { |
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533 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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534 while (scan_in_progress()) { |
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535 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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536 } |
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537 } |
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538 return true; |
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539 } |
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540 |
342 | 541 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
542 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
543 #endif // _MSC_VER | |
544 | |
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545 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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546 return MAX2((n_par_threads + 2) / 4, 1U); |
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547 } |
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548 |
342 | 549 ConcurrentMark::ConcurrentMark(ReservedSpace rs, |
550 int max_regions) : | |
551 _markBitMap1(rs, MinObjAlignment - 1), | |
552 _markBitMap2(rs, MinObjAlignment - 1), | |
553 | |
554 _parallel_marking_threads(0), | |
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555 _max_parallel_marking_threads(0), |
342 | 556 _sleep_factor(0.0), |
557 _marking_task_overhead(1.0), | |
558 _cleanup_sleep_factor(0.0), | |
559 _cleanup_task_overhead(1.0), | |
2152 | 560 _cleanup_list("Cleanup List"), |
342 | 561 _region_bm(max_regions, false /* in_resource_area*/), |
562 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
563 CardTableModRefBS::card_shift, | |
564 false /* in_resource_area*/), | |
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565 |
342 | 566 _prevMarkBitMap(&_markBitMap1), |
567 _nextMarkBitMap(&_markBitMap2), | |
568 _at_least_one_mark_complete(false), | |
569 | |
570 _markStack(this), | |
571 _regionStack(), | |
572 // _finger set in set_non_marking_state | |
573 | |
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574 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 575 // _active_tasks set in set_non_marking_state |
576 // _tasks set inside the constructor | |
577 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
578 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
579 | |
580 _has_overflown(false), | |
581 _concurrent(false), | |
619
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582 _has_aborted(false), |
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583 _restart_for_overflow(false), |
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584 _concurrent_marking_in_progress(false), |
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585 _should_gray_objects(false), |
342 | 586 |
587 // _verbose_level set below | |
588 | |
589 _init_times(), | |
590 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
591 _cleanup_times(), | |
592 _total_counting_time(0.0), | |
593 _total_rs_scrub_time(0.0), | |
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594 |
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595 _parallel_workers(NULL), |
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596 |
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597 _count_card_bitmaps(NULL), |
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598 _count_marked_bytes(NULL) { |
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599 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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600 if (verbose_level < no_verbose) { |
342 | 601 verbose_level = no_verbose; |
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602 } |
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603 if (verbose_level > high_verbose) { |
342 | 604 verbose_level = high_verbose; |
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605 } |
342 | 606 _verbose_level = verbose_level; |
607 | |
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608 if (verbose_low()) { |
342 | 609 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
610 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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611 } |
342 | 612 |
1284 | 613 _markStack.allocate(MarkStackSize); |
751 | 614 _regionStack.allocate(G1MarkRegionStackSize); |
342 | 615 |
616 // Create & start a ConcurrentMark thread. | |
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617 _cmThread = new ConcurrentMarkThread(this); |
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618 assert(cmThread() != NULL, "CM Thread should have been created"); |
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619 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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620 |
342 | 621 _g1h = G1CollectedHeap::heap(); |
622 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
623 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
624 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
625 | |
626 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 627 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 628 |
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629 _root_regions.init(_g1h, this); |
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630 |
342 | 631 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); |
632 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
633 | |
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634 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_task_num); |
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635 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_task_num); |
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636 |
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637 BitMap::idx_t card_bm_size = _card_bm.size(); |
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638 |
342 | 639 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
640 _active_tasks = _max_task_num; | |
641 for (int i = 0; i < (int) _max_task_num; ++i) { | |
642 CMTaskQueue* task_queue = new CMTaskQueue(); | |
643 task_queue->initialize(); | |
644 _task_queues->register_queue(i, task_queue); | |
645 | |
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646 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
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647 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions); |
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648 |
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649 _tasks[i] = new CMTask(i, this, |
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650 _count_marked_bytes[i], |
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651 &_count_card_bitmaps[i], |
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652 task_queue, _task_queues); |
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653 |
342 | 654 _accum_task_vtime[i] = 0.0; |
655 } | |
656 | |
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657 // Calculate the card number for the bottom of the heap. Used |
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658 // in biasing indexes into the accounting card bitmaps. |
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659 _heap_bottom_card_num = |
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660 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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661 CardTableModRefBS::card_shift); |
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662 |
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663 // Clear all the liveness counting data |
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664 clear_all_count_data(); |
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665 |
1284 | 666 if (ConcGCThreads > ParallelGCThreads) { |
667 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
342 | 668 "than ParallelGCThreads."); |
669 } | |
670 if (ParallelGCThreads == 0) { | |
671 // if we are not running with any parallel GC threads we will not | |
672 // spawn any marking threads either | |
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673 _parallel_marking_threads = 0; |
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674 _max_parallel_marking_threads = 0; |
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675 _sleep_factor = 0.0; |
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676 _marking_task_overhead = 1.0; |
342 | 677 } else { |
1284 | 678 if (ConcGCThreads > 0) { |
679 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
342 | 680 // if both are set |
681 | |
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682 _parallel_marking_threads = (uint) ConcGCThreads; |
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683 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 684 _sleep_factor = 0.0; |
685 _marking_task_overhead = 1.0; | |
751 | 686 } else if (G1MarkingOverheadPercent > 0) { |
342 | 687 // we will calculate the number of parallel marking threads |
688 // based on a target overhead with respect to the soft real-time | |
689 // goal | |
690 | |
751 | 691 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 692 double overall_cm_overhead = |
751 | 693 (double) MaxGCPauseMillis * marking_overhead / |
694 (double) GCPauseIntervalMillis; | |
342 | 695 double cpu_ratio = 1.0 / (double) os::processor_count(); |
696 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
697 double marking_task_overhead = | |
698 overall_cm_overhead / marking_thread_num * | |
699 (double) os::processor_count(); | |
700 double sleep_factor = | |
701 (1.0 - marking_task_overhead) / marking_task_overhead; | |
702 | |
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703 _parallel_marking_threads = (uint) marking_thread_num; |
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704 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 705 _sleep_factor = sleep_factor; |
706 _marking_task_overhead = marking_task_overhead; | |
707 } else { | |
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708 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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709 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 710 _sleep_factor = 0.0; |
711 _marking_task_overhead = 1.0; | |
712 } | |
713 | |
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714 if (parallel_marking_threads() > 1) { |
342 | 715 _cleanup_task_overhead = 1.0; |
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716 } else { |
342 | 717 _cleanup_task_overhead = marking_task_overhead(); |
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718 } |
342 | 719 _cleanup_sleep_factor = |
720 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
721 | |
722 #if 0 | |
723 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
724 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
725 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
726 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
727 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
728 #endif | |
729 | |
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730 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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731 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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732 _max_parallel_marking_threads, false, true); |
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733 if (_parallel_workers == NULL) { |
342 | 734 vm_exit_during_initialization("Failed necessary allocation."); |
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735 } else { |
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736 _parallel_workers->initialize_workers(); |
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737 } |
342 | 738 } |
739 | |
740 // so that the call below can read a sensible value | |
741 _heap_start = (HeapWord*) rs.base(); | |
742 set_non_marking_state(); | |
743 } | |
744 | |
745 void ConcurrentMark::update_g1_committed(bool force) { | |
746 // If concurrent marking is not in progress, then we do not need to | |
747 // update _heap_end. This has a subtle and important | |
748 // side-effect. Imagine that two evacuation pauses happen between | |
749 // marking completion and remark. The first one can grow the | |
750 // heap (hence now the finger is below the heap end). Then, the | |
751 // second one could unnecessarily push regions on the region | |
752 // stack. This causes the invariant that the region stack is empty | |
753 // at the beginning of remark to be false. By ensuring that we do | |
754 // not observe heap expansions after marking is complete, then we do | |
755 // not have this problem. | |
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756 if (!concurrent_marking_in_progress() && !force) return; |
342 | 757 |
758 MemRegion committed = _g1h->g1_committed(); | |
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759 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 760 HeapWord* new_end = committed.end(); |
761 if (new_end > _heap_end) { | |
762 // The heap has been expanded. | |
763 | |
764 _heap_end = new_end; | |
765 } | |
766 // Notice that the heap can also shrink. However, this only happens | |
767 // during a Full GC (at least currently) and the entire marking | |
768 // phase will bail out and the task will not be restarted. So, let's | |
769 // do nothing. | |
770 } | |
771 | |
772 void ConcurrentMark::reset() { | |
773 // Starting values for these two. This should be called in a STW | |
774 // phase. CM will be notified of any future g1_committed expansions | |
775 // will be at the end of evacuation pauses, when tasks are | |
776 // inactive. | |
777 MemRegion committed = _g1h->g1_committed(); | |
778 _heap_start = committed.start(); | |
779 _heap_end = committed.end(); | |
780 | |
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781 // Separated the asserts so that we know which one fires. |
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782 assert(_heap_start != NULL, "heap bounds should look ok"); |
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783 assert(_heap_end != NULL, "heap bounds should look ok"); |
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784 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 785 |
786 // reset all the marking data structures and any necessary flags | |
787 clear_marking_state(); | |
788 | |
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789 if (verbose_low()) { |
342 | 790 gclog_or_tty->print_cr("[global] resetting"); |
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791 } |
342 | 792 |
793 // We do reset all of them, since different phases will use | |
794 // different number of active threads. So, it's easiest to have all | |
795 // of them ready. | |
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796 for (int i = 0; i < (int) _max_task_num; ++i) { |
342 | 797 _tasks[i]->reset(_nextMarkBitMap); |
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798 } |
342 | 799 |
800 // we need this to make sure that the flag is on during the evac | |
801 // pause with initial mark piggy-backed | |
802 set_concurrent_marking_in_progress(); | |
803 } | |
804 | |
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805 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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806 assert(active_tasks <= _max_task_num, "we should not have more"); |
342 | 807 |
808 _active_tasks = active_tasks; | |
809 // Need to update the three data structures below according to the | |
810 // number of active threads for this phase. | |
811 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
812 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
813 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
814 | |
815 _concurrent = concurrent; | |
816 // We propagate this to all tasks, not just the active ones. | |
817 for (int i = 0; i < (int) _max_task_num; ++i) | |
818 _tasks[i]->set_concurrent(concurrent); | |
819 | |
820 if (concurrent) { | |
821 set_concurrent_marking_in_progress(); | |
822 } else { | |
823 // We currently assume that the concurrent flag has been set to | |
824 // false before we start remark. At this point we should also be | |
825 // in a STW phase. | |
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826 assert(!concurrent_marking_in_progress(), "invariant"); |
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827 assert(_finger == _heap_end, "only way to get here"); |
342 | 828 update_g1_committed(true); |
829 } | |
830 } | |
831 | |
832 void ConcurrentMark::set_non_marking_state() { | |
833 // We set the global marking state to some default values when we're | |
834 // not doing marking. | |
835 clear_marking_state(); | |
836 _active_tasks = 0; | |
837 clear_concurrent_marking_in_progress(); | |
838 } | |
839 | |
840 ConcurrentMark::~ConcurrentMark() { | |
4735 | 841 // The ConcurrentMark instance is never freed. |
842 ShouldNotReachHere(); | |
342 | 843 } |
844 | |
845 void ConcurrentMark::clearNextBitmap() { | |
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846 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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847 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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848 |
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849 // Make sure that the concurrent mark thread looks to still be in |
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850 // the current cycle. |
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851 guarantee(cmThread()->during_cycle(), "invariant"); |
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852 |
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853 // We are finishing up the current cycle by clearing the next |
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854 // marking bitmap and getting it ready for the next cycle. During |
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855 // this time no other cycle can start. So, let's make sure that this |
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856 // is the case. |
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857 guarantee(!g1h->mark_in_progress(), "invariant"); |
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858 |
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859 // clear the mark bitmap (no grey objects to start with). |
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860 // We need to do this in chunks and offer to yield in between |
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861 // each chunk. |
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862 HeapWord* start = _nextMarkBitMap->startWord(); |
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863 HeapWord* end = _nextMarkBitMap->endWord(); |
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864 HeapWord* cur = start; |
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865 size_t chunkSize = M; |
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866 while (cur < end) { |
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867 HeapWord* next = cur + chunkSize; |
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868 if (next > end) { |
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869 next = end; |
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870 } |
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871 MemRegion mr(cur,next); |
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872 _nextMarkBitMap->clearRange(mr); |
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873 cur = next; |
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874 do_yield_check(); |
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875 |
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876 // Repeat the asserts from above. We'll do them as asserts here to |
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877 // minimize their overhead on the product. However, we'll have |
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878 // them as guarantees at the beginning / end of the bitmap |
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879 // clearing to get some checking in the product. |
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880 assert(cmThread()->during_cycle(), "invariant"); |
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881 assert(!g1h->mark_in_progress(), "invariant"); |
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882 } |
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883 |
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884 // Clear the liveness counting data |
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885 clear_all_count_data(); |
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886 |
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887 // Repeat the asserts from above. |
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888 guarantee(cmThread()->during_cycle(), "invariant"); |
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889 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 890 } |
891 | |
892 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
893 public: | |
894 bool doHeapRegion(HeapRegion* r) { | |
895 if (!r->continuesHumongous()) { | |
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896 r->note_start_of_marking(); |
342 | 897 } |
898 return false; | |
899 } | |
900 }; | |
901 | |
902 void ConcurrentMark::checkpointRootsInitialPre() { | |
903 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
904 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
905 | |
906 _has_aborted = false; | |
907 | |
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908 #ifndef PRODUCT |
1044 | 909 if (G1PrintReachableAtInitialMark) { |
1388 | 910 print_reachable("at-cycle-start", |
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911 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 912 } |
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913 #endif |
342 | 914 |
915 // Initialise marking structures. This has to be done in a STW phase. | |
916 reset(); | |
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917 |
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918 // For each region note start of marking. |
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919 NoteStartOfMarkHRClosure startcl; |
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920 g1h->heap_region_iterate(&startcl); |
342 | 921 } |
922 | |
923 | |
924 void ConcurrentMark::checkpointRootsInitialPost() { | |
925 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
926 | |
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927 // If we force an overflow during remark, the remark operation will |
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928 // actually abort and we'll restart concurrent marking. If we always |
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929 // force an oveflow during remark we'll never actually complete the |
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930 // marking phase. So, we initilize this here, at the start of the |
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931 // cycle, so that at the remaining overflow number will decrease at |
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932 // every remark and we'll eventually not need to cause one. |
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933 force_overflow_stw()->init(); |
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934 |
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935 // Start Concurrent Marking weak-reference discovery. |
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936 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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937 // enable ("weak") refs discovery |
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938 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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939 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 940 |
941 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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942 // This is the start of the marking cycle, we're expected all |
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943 // threads to have SATB queues with active set to false. |
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944 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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945 false /* expected_active */); |
342 | 946 |
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947 _root_regions.prepare_for_scan(); |
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948 |
342 | 949 // update_g1_committed() will be called at the end of an evac pause |
950 // when marking is on. So, it's also called at the end of the | |
951 // initial-mark pause to update the heap end, if the heap expands | |
952 // during it. No need to call it here. | |
953 } | |
954 | |
955 /* | |
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956 * Notice that in the next two methods, we actually leave the STS |
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957 * during the barrier sync and join it immediately afterwards. If we |
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958 * do not do this, the following deadlock can occur: one thread could |
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959 * be in the barrier sync code, waiting for the other thread to also |
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960 * sync up, whereas another one could be trying to yield, while also |
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961 * waiting for the other threads to sync up too. |
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962 * |
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963 * Note, however, that this code is also used during remark and in |
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964 * this case we should not attempt to leave / enter the STS, otherwise |
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965 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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966 * (product). So we should only leave / enter the STS if we are |
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967 * operating concurrently. |
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968 * |
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969 * Because the thread that does the sync barrier has left the STS, it |
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970 * is possible to be suspended for a Full GC or an evacuation pause |
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971 * could occur. This is actually safe, since the entering the sync |
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972 * barrier is one of the last things do_marking_step() does, and it |
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973 * doesn't manipulate any data structures afterwards. |
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974 */ |
342 | 975 |
976 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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977 if (verbose_low()) { |
342 | 978 gclog_or_tty->print_cr("[%d] entering first 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 _first_overflow_barrier_sync.enter(); |
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985 if (concurrent()) { |
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986 ConcurrentGCThread::stsJoin(); |
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987 } |
342 | 988 // at this point everyone should have synced up and not be doing any |
989 // more work | |
990 | |
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991 if (verbose_low()) { |
342 | 992 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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993 } |
342 | 994 |
995 // let task 0 do this | |
996 if (task_num == 0) { | |
997 // task 0 is responsible for clearing the global data structures | |
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998 // We should be here because of an overflow. During STW we should |
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999 // not clear the overflow flag since we rely on it being true when |
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1000 // we exit this method to abort the pause and restart concurent |
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1001 // marking. |
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1002 clear_marking_state(concurrent() /* clear_overflow */); |
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1003 force_overflow()->update(); |
342 | 1004 |
1005 if (PrintGC) { | |
1006 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
1007 gclog_or_tty->stamp(PrintGCTimeStamps); | |
1008 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
1009 } | |
1010 } | |
1011 | |
1012 // after this, each task should reset its own data structures then | |
1013 // then go into the second barrier | |
1014 } | |
1015 | |
1016 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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1017 if (verbose_low()) { |
342 | 1018 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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1019 } |
342 | 1020 |
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1021 if (concurrent()) { |
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1022 ConcurrentGCThread::stsLeave(); |
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1023 } |
342 | 1024 _second_overflow_barrier_sync.enter(); |
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1025 if (concurrent()) { |
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1026 ConcurrentGCThread::stsJoin(); |
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1027 } |
342 | 1028 // at this point everything should be re-initialised and ready to go |
1029 | |
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1030 if (verbose_low()) { |
342 | 1031 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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1032 } |
342 | 1033 } |
1034 | |
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1035 #ifndef PRODUCT |
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1036 void ForceOverflowSettings::init() { |
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1037 _num_remaining = G1ConcMarkForceOverflow; |
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1038 _force = false; |
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1039 update(); |
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1040 } |
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1041 |
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1042 void ForceOverflowSettings::update() { |
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1043 if (_num_remaining > 0) { |
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1044 _num_remaining -= 1; |
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1045 _force = true; |
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1046 } else { |
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1047 _force = false; |
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1048 } |
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1049 } |
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1050 |
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1051 bool ForceOverflowSettings::should_force() { |
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1052 if (_force) { |
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1053 _force = false; |
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1054 return true; |
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1055 } else { |
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1056 return false; |
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1057 } |
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1058 } |
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1059 #endif // !PRODUCT |
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1060 |
342 | 1061 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { |
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1062 guarantee(false, "grayRegionIfNecessary(): don't call this any more"); |
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1063 |
342 | 1064 // The objects on the region have already been marked "in bulk" by |
1065 // the caller. We only need to decide whether to push the region on | |
1066 // the region stack or not. | |
1067 | |
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1068 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
342 | 1069 // We're done with marking and waiting for remark. We do not need to |
1070 // push anything else on the region stack. | |
1071 return; | |
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1072 } |
342 | 1073 |
1074 HeapWord* finger = _finger; | |
1075 | |
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1076 if (verbose_low()) { |
342 | 1077 gclog_or_tty->print_cr("[global] attempting to push " |
1078 "region ["PTR_FORMAT", "PTR_FORMAT"), finger is at " | |
1079 PTR_FORMAT, mr.start(), mr.end(), finger); | |
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1080 } |
342 | 1081 |
1082 if (mr.start() < finger) { | |
1083 // The finger is always heap region aligned and it is not possible | |
1084 // for mr to span heap regions. | |
1023
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1085 assert(mr.end() <= finger, "invariant"); |
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1086 |
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1087 // Separated the asserts so that we know which one fires. |
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1088 assert(mr.start() <= mr.end(), |
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1089 "region boundaries should fall within the committed space"); |
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1090 assert(_heap_start <= mr.start(), |
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1091 "region boundaries should fall within the committed space"); |
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1092 assert(mr.end() <= _heap_end, |
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1093 "region boundaries should fall within the committed space"); |
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1094 if (verbose_low()) { |
342 | 1095 gclog_or_tty->print_cr("[global] region ["PTR_FORMAT", "PTR_FORMAT") " |
1096 "below the finger, pushing it", | |
1097 mr.start(), mr.end()); | |
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1098 } |
342 | 1099 |
1835
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1100 if (!region_stack_push_lock_free(mr)) { |
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1101 if (verbose_low()) { |
342 | 1102 gclog_or_tty->print_cr("[global] region stack has overflown."); |
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1103 } |
342 | 1104 } |
1105 } | |
1106 } | |
1107 | |
1108 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
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1109 guarantee(false, "markAndGrayObjectIfNecessary(): don't call this any more"); |
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1110 |
342 | 1111 // The object is not marked by the caller. We need to at least mark |
1112 // it and maybe push in on the stack. | |
1113 | |
1114 HeapWord* addr = (HeapWord*)p; | |
1115 if (!_nextMarkBitMap->isMarked(addr)) { | |
1116 // We definitely need to mark it, irrespective whether we bail out | |
1117 // because we're done with marking. | |
1118 if (_nextMarkBitMap->parMark(addr)) { | |
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1119 if (!concurrent_marking_in_progress() || !_should_gray_objects) { |
342 | 1120 // If we're done with concurrent marking and we're waiting for |
1121 // remark, then we're not pushing anything on the stack. | |
1122 return; | |
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1123 } |
342 | 1124 |
1125 // No OrderAccess:store_load() is needed. It is implicit in the | |
1126 // CAS done in parMark(addr) above | |
1127 HeapWord* finger = _finger; | |
1128 | |
1129 if (addr < finger) { | |
1130 if (!mark_stack_push(oop(addr))) { | |
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1131 if (verbose_low()) { |
342 | 1132 gclog_or_tty->print_cr("[global] global stack overflow " |
1133 "during parMark"); | |
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1134 } |
342 | 1135 } |
1136 } | |
1137 } | |
1138 } | |
1139 } | |
1140 | |
1141 class CMConcurrentMarkingTask: public AbstractGangTask { | |
1142 private: | |
1143 ConcurrentMark* _cm; | |
1144 ConcurrentMarkThread* _cmt; | |
1145 | |
1146 public: | |
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1147 void work(uint worker_id) { |
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1148 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1149 "this should only be done by a conc GC thread"); |
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1150 ResourceMark rm; |
342 | 1151 |
1152 double start_vtime = os::elapsedVTime(); | |
1153 | |
1154 ConcurrentGCThread::stsJoin(); | |
1155 | |
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1156 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1157 CMTask* the_task = _cm->task(worker_id); |
342 | 1158 the_task->record_start_time(); |
1159 if (!_cm->has_aborted()) { | |
1160 do { | |
1161 double start_vtime_sec = os::elapsedVTime(); | |
1162 double start_time_sec = os::elapsedTime(); | |
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1163 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1164 |
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1165 the_task->do_marking_step(mark_step_duration_ms, |
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1166 true /* do_stealing */, |
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1167 true /* do_termination */); |
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1168 |
342 | 1169 double end_time_sec = os::elapsedTime(); |
1170 double end_vtime_sec = os::elapsedVTime(); | |
1171 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1172 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1173 _cm->clear_has_overflown(); | |
1174 | |
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1175 bool ret = _cm->do_yield_check(worker_id); |
342 | 1176 |
1177 jlong sleep_time_ms; | |
1178 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1179 sleep_time_ms = | |
1180 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1181 ConcurrentGCThread::stsLeave(); | |
1182 os::sleep(Thread::current(), sleep_time_ms, false); | |
1183 ConcurrentGCThread::stsJoin(); | |
1184 } | |
1185 double end_time2_sec = os::elapsedTime(); | |
1186 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1187 | |
1188 #if 0 | |
1189 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1190 "overhead %1.4lf", | |
1191 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1192 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1193 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1194 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1195 #endif | |
1196 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1197 } | |
1198 the_task->record_end_time(); | |
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1199 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1200 |
1201 ConcurrentGCThread::stsLeave(); | |
1202 | |
1203 double end_vtime = os::elapsedVTime(); | |
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1204 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1205 } |
1206 | |
1207 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1208 ConcurrentMarkThread* cmt) : | |
1209 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1210 | |
1211 ~CMConcurrentMarkingTask() { } | |
1212 }; | |
1213 | |
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1214 // Calculates the number of active workers for a concurrent |
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1215 // phase. |
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1216 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1217 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1218 uint n_conc_workers = 0; |
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1219 if (!UseDynamicNumberOfGCThreads || |
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1220 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1221 !ForceDynamicNumberOfGCThreads)) { |
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1222 n_conc_workers = max_parallel_marking_threads(); |
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1223 } else { |
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1224 n_conc_workers = |
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1225 AdaptiveSizePolicy::calc_default_active_workers( |
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1226 max_parallel_marking_threads(), |
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1227 1, /* Minimum workers */ |
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1228 parallel_marking_threads(), |
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1229 Threads::number_of_non_daemon_threads()); |
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1230 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1231 // that scaling has already gone into "_max_parallel_marking_threads". |
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1232 } |
4711 | 1233 assert(n_conc_workers > 0, "Always need at least 1"); |
1234 return n_conc_workers; | |
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1235 } |
4711 | 1236 // If we are not running with any parallel GC threads we will not |
1237 // have spawned any marking threads either. Hence the number of | |
1238 // concurrent workers should be 0. | |
1239 return 0; | |
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1240 } |
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1241 |
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1242 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1243 // Currently, only survivors can be root regions. |
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1244 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1245 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1246 |
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1247 const uintx interval = PrefetchScanIntervalInBytes; |
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1248 HeapWord* curr = hr->bottom(); |
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1249 const HeapWord* end = hr->top(); |
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1250 while (curr < end) { |
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1251 Prefetch::read(curr, interval); |
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1252 oop obj = oop(curr); |
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1253 int size = obj->oop_iterate(&cl); |
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1254 assert(size == obj->size(), "sanity"); |
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1255 curr += size; |
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1256 } |
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1257 } |
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1258 |
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1259 class CMRootRegionScanTask : public AbstractGangTask { |
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1260 private: |
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1261 ConcurrentMark* _cm; |
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1262 |
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1263 public: |
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1264 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1265 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1266 |
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1267 void work(uint worker_id) { |
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1268 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1269 "this should only be done by a conc GC thread"); |
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1270 |
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1271 CMRootRegions* root_regions = _cm->root_regions(); |
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1272 HeapRegion* hr = root_regions->claim_next(); |
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1273 while (hr != NULL) { |
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1274 _cm->scanRootRegion(hr, worker_id); |
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1275 hr = root_regions->claim_next(); |
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1276 } |
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1277 } |
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1278 }; |
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1279 |
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1280 void ConcurrentMark::scanRootRegions() { |
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1281 // scan_in_progress() will have been set to true only if there was |
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1282 // at least one root region to scan. So, if it's false, we |
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1283 // should not attempt to do any further work. |
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1284 if (root_regions()->scan_in_progress()) { |
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1285 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1286 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1287 "Maximum number of marking threads exceeded"); |
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1288 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1289 |
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1290 CMRootRegionScanTask task(this); |
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1291 if (parallel_marking_threads() > 0) { |
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1292 _parallel_workers->set_active_workers((int) active_workers); |
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1293 _parallel_workers->run_task(&task); |
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1294 } else { |
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1295 task.work(0); |
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1296 } |
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1297 |
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1298 // It's possible that has_aborted() is true here without actually |
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1299 // aborting the survivor scan earlier. This is OK as it's |
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1300 // mainly used for sanity checking. |
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1301 root_regions()->scan_finished(); |
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1302 } |
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1303 } |
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1304 |
342 | 1305 void ConcurrentMark::markFromRoots() { |
1306 // we might be tempted to assert that: | |
1307 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1308 // "inconsistent argument?"); | |
1309 // However that wouldn't be right, because it's possible that | |
1310 // a safepoint is indeed in progress as a younger generation | |
1311 // stop-the-world GC happens even as we mark in this generation. | |
1312 | |
1313 _restart_for_overflow = false; | |
3316
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1314 force_overflow_conc()->init(); |
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1315 |
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1316 // _g1h has _n_par_threads |
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1317 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1318 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1319 "Maximum number of marking threads exceeded"); |
4711 | 1320 |
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1321 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1322 |
1323 // Parallel task terminator is set in "set_phase()" | |
1324 set_phase(active_workers, true /* concurrent */); | |
342 | 1325 |
1326 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1327 if (parallel_marking_threads() > 0) { |
4711 | 1328 _parallel_workers->set_active_workers((int)active_workers); |
1329 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
1330 // and the decisions on that MT processing is made elsewhere. | |
1331 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1332 _parallel_workers->run_task(&markingTask); |
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1333 } else { |
342 | 1334 markingTask.work(0); |
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1335 } |
342 | 1336 print_stats(); |
1337 } | |
1338 | |
1339 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1340 // world is stopped at this checkpoint | |
1341 assert(SafepointSynchronize::is_at_safepoint(), | |
1342 "world should be stopped"); | |
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1343 |
342 | 1344 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1345 | |
1346 // If a full collection has happened, we shouldn't do this. | |
1347 if (has_aborted()) { | |
1348 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1349 return; | |
1350 } | |
1351 | |
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1352 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1353 |
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1354 if (VerifyDuringGC) { |
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1355 HandleMark hm; // handle scope |
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1356 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1357 Universe::heap()->prepare_for_verify(); |
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1358 Universe::verify(/* allow dirty */ true, |
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1359 /* silent */ false, |
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1360 /* option */ VerifyOption_G1UsePrevMarking); |
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1361 } |
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1362 |
342 | 1363 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1364 g1p->record_concurrent_mark_remark_start(); | |
1365 | |
1366 double start = os::elapsedTime(); | |
1367 | |
1368 checkpointRootsFinalWork(); | |
1369 | |
1370 double mark_work_end = os::elapsedTime(); | |
1371 | |
1372 weakRefsWork(clear_all_soft_refs); | |
1373 | |
1374 if (has_overflown()) { | |
1375 // Oops. We overflowed. Restart concurrent marking. | |
1376 _restart_for_overflow = true; | |
1377 // Clear the flag. We do not need it any more. | |
1378 clear_has_overflown(); | |
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1379 if (G1TraceMarkStackOverflow) { |
342 | 1380 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1381 } |
342 | 1382 } else { |
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1383 // Aggregate the per-task counting data that we have accumulated |
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1384 // while marking. |
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1385 aggregate_count_data(); |
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1386 |
2149 | 1387 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1388 // We're done with marking. |
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1389 // This is the end of the marking cycle, we're expected all |
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1390 // threads to have SATB queues with active set to true. |
2149 | 1391 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1392 true /* expected_active */); | |
811 | 1393 |
1394 if (VerifyDuringGC) { | |
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1395 HandleMark hm; // handle scope |
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1396 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1397 Universe::heap()->prepare_for_verify(); |
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1398 Universe::verify(/* allow dirty */ true, |
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1399 /* silent */ false, |
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1400 /* option */ VerifyOption_G1UseNextMarking); |
811 | 1401 } |
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1402 assert(!restart_for_overflow(), "sanity"); |
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1403 } |
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1404 |
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1405 // Reset the marking state if marking completed |
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1406 if (!restart_for_overflow()) { |
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1407 set_non_marking_state(); |
342 | 1408 } |
1409 | |
1410 #if VERIFY_OBJS_PROCESSED | |
1411 _scan_obj_cl.objs_processed = 0; | |
1412 ThreadLocalObjQueue::objs_enqueued = 0; | |
1413 #endif | |
1414 | |
1415 // Statistics | |
1416 double now = os::elapsedTime(); | |
1417 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1418 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1419 _remark_times.add((now - start) * 1000.0); | |
1420 | |
1421 g1p->record_concurrent_mark_remark_end(); | |
1422 } | |
1423 | |
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1424 // Used to calculate the # live objects per region |
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1425 // for verification purposes |
342 | 1426 class CalcLiveObjectsClosure: public HeapRegionClosure { |
1427 | |
1428 CMBitMapRO* _bm; | |
1429 ConcurrentMark* _cm; | |
1430 BitMap* _region_bm; | |
1431 BitMap* _card_bm; | |
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1432 |
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1433 // Debugging |
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1434 size_t _tot_words_done; |
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1435 size_t _tot_live; |
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1436 size_t _tot_used; |
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1437 |
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1438 size_t _region_marked_bytes; |
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1439 |
342 | 1440 intptr_t _bottom_card_num; |
1441 | |
1442 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
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1443 assert(start_card_num <= last_card_num, "sanity"); |
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1444 BitMap::idx_t start_idx = start_card_num - _bottom_card_num; |
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1445 BitMap::idx_t last_idx = last_card_num - _bottom_card_num; |
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1446 |
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1447 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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1448 _card_bm->par_at_put(i, 1); |
342 | 1449 } |
1450 } | |
1451 | |
1452 public: | |
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1453 CalcLiveObjectsClosure(CMBitMapRO *bm, ConcurrentMark *cm, |
936 | 1454 BitMap* region_bm, BitMap* card_bm) : |
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1455 _bm(bm), _cm(cm), _region_bm(region_bm), _card_bm(card_bm), |
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1456 _region_marked_bytes(0), _tot_words_done(0), |
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1457 _tot_live(0), _tot_used(0), |
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1458 _bottom_card_num(cm->heap_bottom_card_num()) { } |
342 | 1459 |
829 | 1460 // It takes a region that's not empty (i.e., it has at least one |
1461 // live object in it and sets its corresponding bit on the region | |
1462 // bitmap to 1. If the region is "starts humongous" it will also set | |
1463 // to 1 the bits on the region bitmap that correspond to its | |
1464 // associated "continues humongous" regions. | |
1465 void set_bit_for_region(HeapRegion* hr) { | |
1466 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1467 | |
1468 size_t index = hr->hrs_index(); | |
1469 if (!hr->startsHumongous()) { | |
1470 // Normal (non-humongous) case: just set the bit. | |
1471 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
1472 } else { | |
1473 // Starts humongous case: calculate how many regions are part of | |
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1474 // this humongous region and then set the bit range. |
829 | 1475 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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1476 HeapRegion *last_hr = g1h->heap_region_containing_raw(hr->end() - 1); |
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1477 size_t end_index = last_hr->hrs_index() + 1; |
829 | 1478 _region_bm->par_at_put_range((BitMap::idx_t) index, |
1479 (BitMap::idx_t) end_index, true); | |
1480 } | |
1481 } | |
1482 | |
342 | 1483 bool doHeapRegion(HeapRegion* hr) { |
1484 | |
639 | 1485 if (hr->continuesHumongous()) { |
829 | 1486 // We will ignore these here and process them when their |
1487 // associated "starts humongous" region is processed (see | |
1488 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1489 // associated "starts humongous" region to have their bit set to | |
1490 // 1 since, due to the region chunking in the parallel region | |
1491 // iteration, a "continues humongous" region might be visited | |
1492 // before its associated "starts humongous". | |
639 | 1493 return false; |
1494 } | |
342 | 1495 |
1496 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
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1497 HeapWord* start = hr->bottom(); |
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1498 |
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1499 assert(start <= hr->end() && start <= nextTop && nextTop <= hr->end(), |
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1500 err_msg("Preconditions not met - " |
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1501 "start: "PTR_FORMAT", nextTop: "PTR_FORMAT", end: "PTR_FORMAT, |
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1502 start, nextTop, hr->end())); |
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1503 |
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1504 // Record the number of word's we'll examine. |
342 | 1505 size_t words_done = (nextTop - start); |
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1506 |
342 | 1507 // Find the first marked object at or after "start". |
1508 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
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1509 |
342 | 1510 size_t marked_bytes = 0; |
1511 | |
1512 // Below, the term "card num" means the result of shifting an address | |
1513 // by the card shift -- address 0 corresponds to card number 0. One | |
1514 // must subtract the card num of the bottom of the heap to obtain a | |
1515 // card table index. | |
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1516 |
342 | 1517 // The first card num of the sequence of live cards currently being |
1518 // constructed. -1 ==> no sequence. | |
1519 intptr_t start_card_num = -1; | |
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1520 |
342 | 1521 // The last card num of the sequence of live cards currently being |
1522 // constructed. -1 ==> no sequence. | |
1523 intptr_t last_card_num = -1; | |
1524 | |
1525 while (start < nextTop) { | |
1526 oop obj = oop(start); | |
1527 int obj_sz = obj->size(); | |
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1528 |
342 | 1529 // The card num of the start of the current object. |
1530 intptr_t obj_card_num = | |
1531 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
1532 HeapWord* obj_last = start + obj_sz - 1; | |
1533 intptr_t obj_last_card_num = | |
1534 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
1535 | |
1536 if (obj_card_num != last_card_num) { | |
1537 if (start_card_num == -1) { | |
1538 assert(last_card_num == -1, "Both or neither."); | |
1539 start_card_num = obj_card_num; | |
1540 } else { | |
1541 assert(last_card_num != -1, "Both or neither."); | |
1542 assert(obj_card_num >= last_card_num, "Inv"); | |
1543 if ((obj_card_num - last_card_num) > 1) { | |
1544 // Mark the last run, and start a new one. | |
1545 mark_card_num_range(start_card_num, last_card_num); | |
1546 start_card_num = obj_card_num; | |
1547 } | |
1548 } | |
1549 } | |
1550 // In any case, we set the last card num. | |
1551 last_card_num = obj_last_card_num; | |
1552 | |
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1553 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1554 |
342 | 1555 // Find the next marked object after this one. |
1556 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
1557 } | |
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1558 |
342 | 1559 // Handle the last range, if any. |
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1560 if (start_card_num != -1) { |
342 | 1561 mark_card_num_range(start_card_num, last_card_num); |
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1562 } |
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1563 |
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1564 // Mark the allocated-since-marking portion... |
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1565 HeapWord* top = hr->top(); |
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1566 if (nextTop < top) { |
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1567 start_card_num = intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); |
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1568 last_card_num = intptr_t(uintptr_t(top) >> CardTableModRefBS::card_shift); |
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1569 |
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1570 mark_card_num_range(start_card_num, last_card_num); |
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1571 |
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1572 // This definitely means the region has live objects. |
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1573 set_bit_for_region(hr); |
342 | 1574 } |
1575 | |
1576 // Update the live region bitmap. | |
1577 if (marked_bytes > 0) { | |
829 | 1578 set_bit_for_region(hr); |
342 | 1579 } |
4836
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1580 |
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1581 // Set the marked bytes for the current region so that |
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1582 // it can be queried by a calling verificiation routine |
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1583 _region_marked_bytes = marked_bytes; |
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1584 |
342 | 1585 _tot_live += hr->next_live_bytes(); |
1586 _tot_used += hr->used(); | |
4836
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1587 _tot_words_done = words_done; |
342 | 1588 |
1589 return false; | |
1590 } | |
1591 | |
4836
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1592 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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|
1593 |
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1594 // Debugging |
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1595 size_t tot_words_done() const { return _tot_words_done; } |
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1596 size_t tot_live() const { return _tot_live; } |
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1597 size_t tot_used() const { return _tot_used; } |
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1598 }; |
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|
1599 |
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1600 // Heap region closure used for verifying the counting data |
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1601 // that was accumulated concurrently and aggregated during |
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1602 // the remark pause. This closure is applied to the heap |
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1603 // regions during the STW cleanup pause. |
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|
1604 |
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1605 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1606 ConcurrentMark* _cm; |
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1607 CalcLiveObjectsClosure _calc_cl; |
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1608 BitMap* _region_bm; // Region BM to be verified |
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1609 BitMap* _card_bm; // Card BM to be verified |
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1610 bool _verbose; // verbose output? |
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|
1611 |
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1612 BitMap* _exp_region_bm; // Expected Region BM values |
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1613 BitMap* _exp_card_bm; // Expected card BM values |
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|
1614 |
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1615 int _failures; |
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|
1616 |
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|
1617 public: |
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1618 VerifyLiveObjectDataHRClosure(ConcurrentMark* cm, |
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1619 BitMap* region_bm, |
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1620 BitMap* card_bm, |
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1621 BitMap* exp_region_bm, |
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|
1622 BitMap* exp_card_bm, |
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|
1623 bool verbose) : |
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|
1624 _cm(cm), |
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1625 _calc_cl(_cm->nextMarkBitMap(), _cm, exp_region_bm, exp_card_bm), |
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1626 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1627 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1628 _failures(0) { } |
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|
1629 |
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1630 int failures() const { return _failures; } |
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|
1631 |
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1632 bool doHeapRegion(HeapRegion* hr) { |
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1633 if (hr->continuesHumongous()) { |
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1634 // We will ignore these here and process them when their |
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1635 // associated "starts humongous" region is processed (see |
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1636 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1637 // associated "starts humongous" region to have their bit set to |
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1638 // 1 since, due to the region chunking in the parallel region |
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1639 // iteration, a "continues humongous" region might be visited |
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1640 // before its associated "starts humongous". |
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|
1641 return false; |
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|
1642 } |
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|
1643 |
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|
1644 int failures = 0; |
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|
1645 |
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|
1646 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1647 // this region and set the corresponding bits in the expected region |
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|
1648 // and card bitmaps. |
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|
1649 bool res = _calc_cl.doHeapRegion(hr); |
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1650 assert(res == false, "should be continuing"); |
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|
1651 |
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|
1652 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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|
1653 Mutex::_no_safepoint_check_flag); |
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|
1654 |
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|
1655 // Verify that _top_at_conc_count == ntams |
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|
1656 if (hr->top_at_conc_mark_count() != hr->next_top_at_mark_start()) { |
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|
1657 if (_verbose) { |
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|
1658 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": top at conc count incorrect: " |
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|
1659 "expected " PTR_FORMAT ", actual: " PTR_FORMAT, |
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|
1660 hr->hrs_index(), hr->next_top_at_mark_start(), |
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|
1661 hr->top_at_conc_mark_count()); |
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|
1662 } |
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|
1663 failures += 1; |
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|
1664 } |
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|
1665 |
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|
1666 // Verify the marked bytes for this region. |
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|
1667 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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|
1668 size_t act_marked_bytes = hr->next_marked_bytes(); |
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|
1669 |
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|
1670 // We're not OK if expected marked bytes > actual marked bytes. It means |
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|
1671 // we have missed accounting some objects during the actual marking. |
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|
1672 if (exp_marked_bytes > act_marked_bytes) { |
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|
1673 if (_verbose) { |
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|
1674 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": marked bytes mismatch: " |
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|
1675 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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|
1676 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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|
1677 } |
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|
1678 failures += 1; |
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|
1679 } |
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|
1680 |
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|
1681 // Verify the bit, for this region, in the actual and expected |
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|
1682 // (which was just calculated) region bit maps. |
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1683 // We're not OK if the bit in the calculated expected region |
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|
1684 // bitmap is set and the bit in the actual region bitmap is not. |
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|
1685 BitMap::idx_t index = (BitMap::idx_t)hr->hrs_index(); |
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|
1686 |
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|
1687 bool expected = _exp_region_bm->at(index); |
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|
1688 bool actual = _region_bm->at(index); |
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|
1689 if (expected && !actual) { |
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|
1690 if (_verbose) { |
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|
1691 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": region bitmap mismatch: " |
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|
1692 "expected: %d, actual: %d", |
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|
1693 hr->hrs_index(), expected, actual); |
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|
1694 } |
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|
1695 failures += 1; |
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changeset
|
1696 } |
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|
1697 |
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changeset
|
1698 // Verify that the card bit maps for the cards spanned by the current |
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|
1699 // region match. We have an error if we have a set bit in the expected |
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|
1700 // bit map and the corresponding bit in the actual bitmap is not set. |
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1701 |
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1702 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1703 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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|
1704 |
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|
1705 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1706 expected = _exp_card_bm->at(i); |
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1707 actual = _card_bm->at(i); |
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|
1708 |
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|
1709 if (expected && !actual) { |
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|
1710 if (_verbose) { |
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1711 gclog_or_tty->print_cr("Region " SIZE_FORMAT ": card bitmap mismatch at " SIZE_FORMAT ": " |
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1712 "expected: %d, actual: %d", |
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|
1713 hr->hrs_index(), i, expected, actual); |
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|
1714 } |
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|
1715 failures += 1; |
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|
1716 } |
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|
1717 } |
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|
1718 |
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1719 if (failures > 0 && _verbose) { |
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1720 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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1721 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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1722 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
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1723 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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1724 } |
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|
1725 |
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1726 _failures += failures; |
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|
1727 |
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1728 // We could stop iteration over the heap when we |
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1729 // find the first voilating region by returning true. |
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1730 return false; |
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|
1731 } |
342 | 1732 }; |
1733 | |
1734 | |
4836
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1735 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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1736 protected: |
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1737 G1CollectedHeap* _g1h; |
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1738 ConcurrentMark* _cm; |
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|
1739 BitMap* _actual_region_bm; |
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1740 BitMap* _actual_card_bm; |
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|
1741 |
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|
1742 uint _n_workers; |
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|
1743 |
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|
1744 BitMap* _expected_region_bm; |
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|
1745 BitMap* _expected_card_bm; |
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|
1746 |
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|
1747 int _failures; |
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|
1748 bool _verbose; |
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|
1749 |
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|
1750 public: |
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1751 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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1752 BitMap* region_bm, BitMap* card_bm, |
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|
1753 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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1754 : AbstractGangTask("G1 verify final counting"), |
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1755 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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|
1756 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1757 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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1758 _failures(0), _verbose(false), |
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|
1759 _n_workers(0) { |
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|
1760 assert(VerifyDuringGC, "don't call this otherwise"); |
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|
1761 |
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|
1762 // Use the value already set as the number of active threads |
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|
1763 // in the call to run_task(). |
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|
1764 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1765 assert( _g1h->workers()->active_workers() > 0, |
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|
1766 "Should have been previously set"); |
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|
1767 _n_workers = _g1h->workers()->active_workers(); |
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|
1768 } else { |
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|
1769 _n_workers = 1; |
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|
1770 } |
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|
1771 |
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|
1772 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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|
1773 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1774 |
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|
1775 _verbose = _cm->verbose_medium(); |
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|
1776 } |
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|
1777 |
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|
1778 void work(uint worker_id) { |
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|
1779 assert(worker_id < _n_workers, "invariant"); |
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|
1780 |
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|
1781 VerifyLiveObjectDataHRClosure verify_cl(_cm, |
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|
1782 _actual_region_bm, _actual_card_bm, |
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|
1783 _expected_region_bm, |
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changeset
|
1784 _expected_card_bm, |
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|
1785 _verbose); |
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|
1786 |
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|
1787 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1788 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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|
1789 worker_id, |
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|
1790 _n_workers, |
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|
1791 HeapRegion::VerifyCountClaimValue); |
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|
1792 } else { |
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|
1793 _g1h->heap_region_iterate(&verify_cl); |
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|
1794 } |
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|
1795 |
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|
1796 Atomic::add(verify_cl.failures(), &_failures); |
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|
1797 } |
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|
1798 |
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|
1799 int failures() const { return _failures; } |
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|
1800 }; |
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|
1801 |
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|
1802 // Final update of count data (during cleanup). |
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|
1803 // Adds [top_at_count, NTAMS) to the marked bytes for each |
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|
1804 // region. Sets the bits in the card bitmap corresponding |
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|
1805 // to the interval [top_at_count, top], and sets the |
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|
1806 // liveness bit for each region containing live data |
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|
1807 // in the region bitmap. |
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|
1808 |
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|
1809 class FinalCountDataUpdateClosure: public HeapRegionClosure { |
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|
1810 ConcurrentMark* _cm; |
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|
1811 BitMap* _region_bm; |
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|
1812 BitMap* _card_bm; |
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|
1813 |
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|
1814 size_t _total_live_bytes; |
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|
1815 size_t _total_used_bytes; |
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|
1816 size_t _total_words_done; |
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|
1817 |
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|
1818 void set_card_bitmap_range(BitMap::idx_t start_idx, BitMap::idx_t last_idx) { |
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|
1819 assert(start_idx <= last_idx, "sanity"); |
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|
1820 |
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|
1821 // Set the inclusive bit range [start_idx, last_idx]. |
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|
1822 // For small ranges (up to 8 cards) use a simple loop; otherwise |
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|
1823 // use par_at_put_range. |
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|
1824 if ((last_idx - start_idx) <= 8) { |
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|
1825 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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|
1826 _card_bm->par_set_bit(i); |
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|
1827 } |
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|
1828 } else { |
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|
1829 assert(last_idx < _card_bm->size(), "sanity"); |
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1830 // Note BitMap::par_at_put_range() is exclusive. |
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1831 _card_bm->par_at_put_range(start_idx, last_idx+1, true); |
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1832 } |
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1833 } |
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1834 |
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1835 // It takes a region that's not empty (i.e., it has at least one |
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1836 // live object in it and sets its corresponding bit on the region |
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1837 // bitmap to 1. If the region is "starts humongous" it will also set |
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1838 // to 1 the bits on the region bitmap that correspond to its |
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1839 // associated "continues humongous" regions. |
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1840 void set_bit_for_region(HeapRegion* hr) { |
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1841 assert(!hr->continuesHumongous(), "should have filtered those out"); |
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1842 |
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1843 size_t index = hr->hrs_index(); |
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1844 if (!hr->startsHumongous()) { |
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1845 // Normal (non-humongous) case: just set the bit. |
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1846 _region_bm->par_set_bit((BitMap::idx_t) index); |
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1847 } else { |
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1848 // Starts humongous case: calculate how many regions are part of |
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1849 // this humongous region and then set the bit range. |
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1850 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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1851 HeapRegion *last_hr = g1h->heap_region_containing_raw(hr->end() - 1); |
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1852 size_t end_index = last_hr->hrs_index() + 1; |
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1853 _region_bm->par_at_put_range((BitMap::idx_t) index, |
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1854 (BitMap::idx_t) end_index, true); |
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1855 } |
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1856 } |
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1857 |
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1858 public: |
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1859 FinalCountDataUpdateClosure(ConcurrentMark* cm, |
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1860 BitMap* region_bm, |
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1861 BitMap* card_bm) : |
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1862 _cm(cm), _region_bm(region_bm), _card_bm(card_bm), |
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1863 _total_words_done(0), _total_live_bytes(0), _total_used_bytes(0) { } |
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1864 |
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1865 bool doHeapRegion(HeapRegion* hr) { |
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1866 |
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1867 if (hr->continuesHumongous()) { |
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1868 // We will ignore these here and process them when their |
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1869 // associated "starts humongous" region is processed (see |
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1870 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1871 // associated "starts humongous" region to have their bit set to |
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1872 // 1 since, due to the region chunking in the parallel region |
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1873 // iteration, a "continues humongous" region might be visited |
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1874 // before its associated "starts humongous". |
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1875 return false; |
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1876 } |
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1877 |
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1878 HeapWord* start = hr->top_at_conc_mark_count(); |
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1879 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1880 HeapWord* top = hr->top(); |
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1881 |
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1882 assert(hr->bottom() <= start && start <= hr->end() && |
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1883 hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
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1884 |
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1885 size_t words_done = ntams - hr->bottom(); |
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1886 |
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1887 if (start < ntams) { |
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1888 // Region was changed between remark and cleanup pauses |
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1889 // We need to add (ntams - start) to the marked bytes |
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1890 // for this region, and set bits for the range |
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1891 // [ card_idx(start), card_idx(ntams) ) in the card bitmap. |
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1892 size_t live_bytes = (ntams - start) * HeapWordSize; |
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1893 hr->add_to_marked_bytes(live_bytes); |
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1894 |
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1895 // Record the new top at conc count |
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1896 hr->set_top_at_conc_mark_count(ntams); |
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1897 |
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1898 // The setting of the bits in the card bitmap takes place below |
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1899 } |
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1900 |
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1901 // Mark the allocated-since-marking portion... |
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1902 if (ntams < top) { |
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1903 // This definitely means the region has live objects. |
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1904 set_bit_for_region(hr); |
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1905 } |
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1906 |
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1907 // Now set the bits for [start, top] |
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1908 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1909 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top); |
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1910 set_card_bitmap_range(start_idx, last_idx); |
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1911 |
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1912 // Set the bit for the region if it contains live data |
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1913 if (hr->next_marked_bytes() > 0) { |
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1914 set_bit_for_region(hr); |
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1915 } |
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1916 |
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1917 _total_words_done += words_done; |
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1918 _total_used_bytes += hr->used(); |
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1919 _total_live_bytes += hr->next_marked_bytes(); |
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1920 |
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1921 return false; |
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1922 } |
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1923 |
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1924 size_t total_words_done() const { return _total_words_done; } |
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1925 size_t total_live_bytes() const { return _total_live_bytes; } |
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1926 size_t total_used_bytes() const { return _total_used_bytes; } |
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1927 }; |
342 | 1928 |
1929 class G1ParFinalCountTask: public AbstractGangTask { | |
1930 protected: | |
1931 G1CollectedHeap* _g1h; | |
4836
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1932 ConcurrentMark* _cm; |
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1933 BitMap* _actual_region_bm; |
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1934 BitMap* _actual_card_bm; |
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1935 |
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1936 uint _n_workers; |
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1937 |
342 | 1938 size_t *_live_bytes; |
1939 size_t *_used_bytes; | |
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1940 |
342 | 1941 public: |
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1942 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1943 : AbstractGangTask("G1 final counting"), |
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1944 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1945 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1946 _n_workers(0) { |
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1947 // Use the value already set as the number of active threads |
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1948 // in the call to run_task(). Needed for the allocation of |
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1949 // _live_bytes and _used_bytes. |
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1950 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1951 assert( _g1h->workers()->active_workers() > 0, |
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1952 "Should have been previously set"); |
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1953 _n_workers = _g1h->workers()->active_workers(); |
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1954 } else { |
342 | 1955 _n_workers = 1; |
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1956 } |
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1957 |
342 | 1958 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); |
1959 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
1960 } | |
1961 | |
1962 ~G1ParFinalCountTask() { | |
1963 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
1964 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
1965 } | |
1966 | |
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1967 void work(uint worker_id) { |
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1968 assert(worker_id < _n_workers, "invariant"); |
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1969 |
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1970 FinalCountDataUpdateClosure final_update_cl(_cm, |
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1971 _actual_region_bm, |
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1972 _actual_card_bm); |
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1973 |
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1974 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1975 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1976 worker_id, |
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1977 _n_workers, |
355 | 1978 HeapRegion::FinalCountClaimValue); |
342 | 1979 } else { |
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1980 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1981 } |
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1982 |
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1983 _live_bytes[worker_id] = final_update_cl.total_live_bytes(); |
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1984 _used_bytes[worker_id] = final_update_cl.total_used_bytes(); |
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1985 } |
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1986 |
342 | 1987 size_t live_bytes() { |
1988 size_t live_bytes = 0; | |
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1989 for (uint i = 0; i < _n_workers; ++i) |
342 | 1990 live_bytes += _live_bytes[i]; |
1991 return live_bytes; | |
1992 } | |
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1993 |
342 | 1994 size_t used_bytes() { |
1995 size_t used_bytes = 0; | |
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1996 for (uint i = 0; i < _n_workers; ++i) |
342 | 1997 used_bytes += _used_bytes[i]; |
1998 return used_bytes; | |
1999 } | |
2000 }; | |
2001 | |
2002 class G1ParNoteEndTask; | |
2003 | |
2004 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
2005 G1CollectedHeap* _g1; | |
2006 int _worker_num; | |
2007 size_t _max_live_bytes; | |
2008 size_t _regions_claimed; | |
2009 size_t _freed_bytes; | |
2173 | 2010 FreeRegionList* _local_cleanup_list; |
4072 | 2011 OldRegionSet* _old_proxy_set; |
2173 | 2012 HumongousRegionSet* _humongous_proxy_set; |
2013 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 2014 double _claimed_region_time; |
2015 double _max_region_time; | |
2016 | |
2017 public: | |
2018 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 2019 int worker_num, |
2020 FreeRegionList* local_cleanup_list, | |
4072 | 2021 OldRegionSet* old_proxy_set, |
2173 | 2022 HumongousRegionSet* humongous_proxy_set, |
4093
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2023 HRRSCleanupTask* hrrs_cleanup_task) : |
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2024 _g1(g1), _worker_num(worker_num), |
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2025 _max_live_bytes(0), _regions_claimed(0), |
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2026 _freed_bytes(0), |
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2027 _claimed_region_time(0.0), _max_region_time(0.0), |
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2028 _local_cleanup_list(local_cleanup_list), |
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2029 _old_proxy_set(old_proxy_set), |
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2030 _humongous_proxy_set(humongous_proxy_set), |
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2031 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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2032 |
342 | 2033 size_t freed_bytes() { return _freed_bytes; } |
2034 | |
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2035 bool doHeapRegion(HeapRegion *hr) { |
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2036 // We use a claim value of zero here because all regions |
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2037 // were claimed with value 1 in the FinalCount task. |
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2038 hr->reset_gc_time_stamp(); |
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2039 if (!hr->continuesHumongous()) { |
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2040 double start = os::elapsedTime(); |
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2041 _regions_claimed++; |
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2042 hr->note_end_of_marking(); |
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2043 _max_live_bytes += hr->max_live_bytes(); |
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2044 _g1->free_region_if_empty(hr, |
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2045 &_freed_bytes, |
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2046 _local_cleanup_list, |
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2047 _old_proxy_set, |
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2048 _humongous_proxy_set, |
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2049 _hrrs_cleanup_task, |
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2050 true /* par */); |
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2051 double region_time = (os::elapsedTime() - start); |
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2052 _claimed_region_time += region_time; |
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2053 if (region_time > _max_region_time) { |
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2054 _max_region_time = region_time; |
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2055 } |
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2056 } |
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2057 return false; |
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2058 } |
342 | 2059 |
2060 size_t max_live_bytes() { return _max_live_bytes; } | |
2061 size_t regions_claimed() { return _regions_claimed; } | |
2062 double claimed_region_time_sec() { return _claimed_region_time; } | |
2063 double max_region_time_sec() { return _max_region_time; } | |
2064 }; | |
2065 | |
2066 class G1ParNoteEndTask: public AbstractGangTask { | |
2067 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 2068 |
342 | 2069 protected: |
2070 G1CollectedHeap* _g1h; | |
2071 size_t _max_live_bytes; | |
2072 size_t _freed_bytes; | |
2152 | 2073 FreeRegionList* _cleanup_list; |
2074 | |
342 | 2075 public: |
2076 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 2077 FreeRegionList* cleanup_list) : |
342 | 2078 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 2079 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 2080 |
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2081 void work(uint worker_id) { |
342 | 2082 double start = os::elapsedTime(); |
2173 | 2083 FreeRegionList local_cleanup_list("Local Cleanup List"); |
4072 | 2084 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
2173 | 2085 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
2086 HRRSCleanupTask hrrs_cleanup_task; | |
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2087 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
4072 | 2088 &old_proxy_set, |
2173 | 2089 &humongous_proxy_set, |
2090 &hrrs_cleanup_task); | |
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2091 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2092 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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2093 _g1h->workers()->active_workers(), |
355 | 2094 HeapRegion::NoteEndClaimValue); |
342 | 2095 } else { |
2096 _g1h->heap_region_iterate(&g1_note_end); | |
2097 } | |
2098 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
2099 | |
2152 | 2100 // Now update the lists |
2101 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
2102 NULL /* free_list */, | |
4072 | 2103 &old_proxy_set, |
2173 | 2104 &humongous_proxy_set, |
2152 | 2105 true /* par */); |
342 | 2106 { |
2107 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
2108 _max_live_bytes += g1_note_end.max_live_bytes(); | |
2109 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 2110 |
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2111 // If we iterate over the global cleanup list at the end of |
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2112 // cleanup to do this printing we will not guarantee to only |
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2113 // generate output for the newly-reclaimed regions (the list |
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2114 // might not be empty at the beginning of cleanup; we might |
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2115 // still be working on its previous contents). So we do the |
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2116 // printing here, before we append the new regions to the global |
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2117 // cleanup list. |
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2118 |
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2119 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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2120 if (hr_printer->is_active()) { |
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2121 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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2122 while (iter.more_available()) { |
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2123 HeapRegion* hr = iter.get_next(); |
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2124 hr_printer->cleanup(hr); |
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2125 } |
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2126 } |
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2127 |
2173 | 2128 _cleanup_list->add_as_tail(&local_cleanup_list); |
2129 assert(local_cleanup_list.is_empty(), "post-condition"); | |
2130 | |
2131 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 2132 } |
2133 double end = os::elapsedTime(); | |
2134 if (G1PrintParCleanupStats) { | |
2135 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
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2136 "claimed %u regions (tot = %8.3f ms, max = %8.3f ms).\n", |
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2137 worker_id, start, end, (end-start)*1000.0, |
342 | 2138 g1_note_end.regions_claimed(), |
2139 g1_note_end.claimed_region_time_sec()*1000.0, | |
2140 g1_note_end.max_region_time_sec()*1000.0); | |
2141 } | |
2142 } | |
2143 size_t max_live_bytes() { return _max_live_bytes; } | |
2144 size_t freed_bytes() { return _freed_bytes; } | |
2145 }; | |
2146 | |
2147 class G1ParScrubRemSetTask: public AbstractGangTask { | |
2148 protected: | |
2149 G1RemSet* _g1rs; | |
2150 BitMap* _region_bm; | |
2151 BitMap* _card_bm; | |
2152 public: | |
2153 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
2154 BitMap* region_bm, BitMap* card_bm) : | |
2155 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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2156 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 2157 |
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2158 void work(uint worker_id) { |
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2159 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2160 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 2161 HeapRegion::ScrubRemSetClaimValue); |
342 | 2162 } else { |
2163 _g1rs->scrub(_region_bm, _card_bm); | |
2164 } | |
2165 } | |
2166 | |
2167 }; | |
2168 | |
2169 void ConcurrentMark::cleanup() { | |
2170 // world is stopped at this checkpoint | |
2171 assert(SafepointSynchronize::is_at_safepoint(), | |
2172 "world should be stopped"); | |
2173 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2174 | |
2175 // If a full collection has happened, we shouldn't do this. | |
2176 if (has_aborted()) { | |
2177 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
2178 return; | |
2179 } | |
2180 | |
4072 | 2181 HRSPhaseSetter x(HRSPhaseCleanup); |
2152 | 2182 g1h->verify_region_sets_optional(); |
2183 | |
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2184 if (VerifyDuringGC) { |
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2185 HandleMark hm; // handle scope |
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2186 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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2187 Universe::heap()->prepare_for_verify(); |
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2188 Universe::verify(/* allow dirty */ true, |
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2189 /* silent */ false, |
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2190 /* option */ VerifyOption_G1UsePrevMarking); |
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2191 } |
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2192 |
342 | 2193 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
2194 g1p->record_concurrent_mark_cleanup_start(); | |
2195 | |
2196 double start = os::elapsedTime(); | |
2197 | |
2173 | 2198 HeapRegionRemSet::reset_for_cleanup_tasks(); |
2199 | |
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2200 uint n_workers; |
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2201 |
342 | 2202 // Do counting once more with the world stopped for good measure. |
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2203 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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2204 |
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2205 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2206 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 2207 "sanity check"); |
2208 | |
4711 | 2209 g1h->set_par_threads(); |
2210 n_workers = g1h->n_par_threads(); | |
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2211 assert(g1h->n_par_threads() == n_workers, |
4711 | 2212 "Should not have been reset"); |
342 | 2213 g1h->workers()->run_task(&g1_par_count_task); |
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2214 // Done with the parallel phase so reset to 0. |
342 | 2215 g1h->set_par_threads(0); |
355 | 2216 |
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2217 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 2218 "sanity check"); |
342 | 2219 } else { |
4711 | 2220 n_workers = 1; |
342 | 2221 g1_par_count_task.work(0); |
2222 } | |
2223 | |
4836
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2224 if (VerifyDuringGC) { |
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|
2225 // Verify that the counting data accumulated during marking matches |
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2226 // that calculated by walking the marking bitmap. |
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|
2227 |
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2228 // Bitmaps to hold expected values |
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|
2229 BitMap expected_region_bm(_region_bm.size(), false); |
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2230 BitMap expected_card_bm(_card_bm.size(), false); |
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2231 |
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2232 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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|
2233 &_region_bm, |
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|
2234 &_card_bm, |
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|
2235 &expected_region_bm, |
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|
2236 &expected_card_bm); |
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|
2237 |
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|
2238 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
2239 g1h->set_par_threads((int)n_workers); |
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2240 g1h->workers()->run_task(&g1_par_verify_task); |
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2241 // Done with the parallel phase so reset to 0. |
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2242 g1h->set_par_threads(0); |
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|
2243 |
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|
2244 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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|
2245 "sanity check"); |
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|
2246 } else { |
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|
2247 g1_par_verify_task.work(0); |
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|
2248 } |
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|
2249 |
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|
2250 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2251 } |
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|
2252 |
342 | 2253 size_t known_garbage_bytes = |
2254 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
2255 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
2256 | |
2257 size_t start_used_bytes = g1h->used(); | |
2258 _at_least_one_mark_complete = true; | |
2259 g1h->set_marking_complete(); | |
2260 | |
3914
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|
2261 ergo_verbose4(ErgoConcCycles, |
20213c8a3c40
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|
2262 "finish cleanup", |
20213c8a3c40
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|
2263 ergo_format_byte("occupancy") |
20213c8a3c40
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|
2264 ergo_format_byte("capacity") |
20213c8a3c40
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|
2265 ergo_format_byte_perc("known garbage"), |
20213c8a3c40
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|
2266 start_used_bytes, g1h->capacity(), |
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|
2267 known_garbage_bytes, |
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|
2268 ((double) known_garbage_bytes / (double) g1h->capacity()) * 100.0); |
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|
2269 |
342 | 2270 double count_end = os::elapsedTime(); |
2271 double this_final_counting_time = (count_end - start); | |
2272 if (G1PrintParCleanupStats) { | |
2273 gclog_or_tty->print_cr("Cleanup:"); | |
2274 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
2275 this_final_counting_time*1000.0); | |
2276 } | |
2277 _total_counting_time += this_final_counting_time; | |
2278 | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
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|
2279 if (G1PrintRegionLivenessInfo) { |
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2369
diff
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|
2280 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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|
2281 _g1h->heap_region_iterate(&cl); |
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2369
diff
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|
2282 } |
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|
2283 |
342 | 2284 // Install newly created mark bitMap as "prev". |
2285 swapMarkBitMaps(); | |
2286 | |
2287 g1h->reset_gc_time_stamp(); | |
2288 | |
2289 // Note end of marking in all heap regions. | |
2290 double note_end_start = os::elapsedTime(); | |
2152 | 2291 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
1833
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|
2292 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
2293 g1h->set_par_threads((int)n_workers); |
342 | 2294 g1h->workers()->run_task(&g1_par_note_end_task); |
2295 g1h->set_par_threads(0); | |
355 | 2296 |
2297 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2298 "sanity check"); | |
342 | 2299 } else { |
2300 g1_par_note_end_task.work(0); | |
2301 } | |
2152 | 2302 |
2303 if (!cleanup_list_is_empty()) { | |
2304 // The cleanup list is not empty, so we'll have to process it | |
2305 // concurrently. Notify anyone else that might be wanting free | |
2306 // regions that there will be more free regions coming soon. | |
2307 g1h->set_free_regions_coming(); | |
2308 } | |
342 | 2309 double note_end_end = os::elapsedTime(); |
2310 if (G1PrintParCleanupStats) { | |
2311 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
2312 (note_end_end - note_end_start)*1000.0); | |
2313 } | |
2314 | |
2315 // call below, since it affects the metric by which we sort the heap | |
2316 // regions. | |
2317 if (G1ScrubRemSets) { | |
2318 double rs_scrub_start = os::elapsedTime(); | |
2319 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
1833
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|
2320 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
2321 g1h->set_par_threads((int)n_workers); |
342 | 2322 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2323 g1h->set_par_threads(0); | |
355 | 2324 |
2325 assert(g1h->check_heap_region_claim_values( | |
2326 HeapRegion::ScrubRemSetClaimValue), | |
2327 "sanity check"); | |
342 | 2328 } else { |
2329 g1_par_scrub_rs_task.work(0); | |
2330 } | |
2331 | |
2332 double rs_scrub_end = os::elapsedTime(); | |
2333 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2334 _total_rs_scrub_time += this_rs_scrub_time; | |
2335 } | |
2336 | |
2337 // this will also free any regions totally full of garbage objects, | |
2338 // and sort the regions. | |
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|
2339 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2340 |
2341 // Statistics. | |
2342 double end = os::elapsedTime(); | |
2343 _cleanup_times.add((end - start) * 1000.0); | |
2344 | |
2345 if (PrintGC || PrintGCDetails) { | |
2346 g1h->print_size_transition(gclog_or_tty, | |
2347 start_used_bytes, | |
2348 g1h->used(), | |
2349 g1h->capacity()); | |
2350 } | |
2351 | |
2352 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
2353 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
2354 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
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|
2355 // Clean up will have freed any regions completely full of garbage. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
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|
2356 // Update the soft reference policy with the new heap occupancy. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
diff
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|
2357 Universe::update_heap_info_at_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
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|
2358 |
342 | 2359 // We need to make this be a "collection" so any collection pause that |
2360 // races with it goes around and waits for completeCleanup to finish. | |
2361 g1h->increment_total_collections(); | |
2362 | |
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|
2363 // We reclaimed old regions so we should calculate the sizes to make |
0b3d1ec6eaee
7097586: G1: improve the per-space output when using jmap -heap
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|
2364 // sure we update the old gen/space data. |
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|
2365 g1h->g1mm()->update_sizes(); |
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|
2366 |
751 | 2367 if (VerifyDuringGC) { |
845
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|
2368 HandleMark hm; // handle scope |
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|
2369 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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|
2370 Universe::heap()->prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
changeset
|
2371 Universe::verify(/* allow dirty */ true, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3771
diff
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|
2372 /* silent */ false, |
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|
2373 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 2374 } |
2152 | 2375 |
2376 g1h->verify_region_sets_optional(); | |
342 | 2377 } |
2378 | |
2379 void ConcurrentMark::completeCleanup() { | |
2380 if (has_aborted()) return; | |
2381 | |
2152 | 2382 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2383 | |
2384 _cleanup_list.verify_optional(); | |
2361 | 2385 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2386 |
2387 if (G1ConcRegionFreeingVerbose) { | |
2388 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
2389 "cleanup list has "SIZE_FORMAT" entries", | |
2390 _cleanup_list.length()); | |
2391 } | |
2392 | |
2393 // Noone else should be accessing the _cleanup_list at this point, | |
2394 // so it's not necessary to take any locks | |
2395 while (!_cleanup_list.is_empty()) { | |
2396 HeapRegion* hr = _cleanup_list.remove_head(); | |
2397 assert(hr != NULL, "the list was not empty"); | |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3316
diff
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|
2398 hr->par_clear(); |
2361 | 2399 tmp_free_list.add_as_tail(hr); |
2152 | 2400 |
2401 // Instead of adding one region at a time to the secondary_free_list, | |
2402 // we accumulate them in the local list and move them a few at a | |
2403 // time. This also cuts down on the number of notify_all() calls | |
2404 // we do during this process. We'll also append the local list when | |
2405 // _cleanup_list is empty (which means we just removed the last | |
2406 // region from the _cleanup_list). | |
2361 | 2407 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2408 _cleanup_list.is_empty()) { |
2409 if (G1ConcRegionFreeingVerbose) { | |
2410 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
2411 "appending "SIZE_FORMAT" entries to the " | |
2412 "secondary_free_list, clean list still has " | |
2413 SIZE_FORMAT" entries", | |
2361 | 2414 tmp_free_list.length(), |
2152 | 2415 _cleanup_list.length()); |
342 | 2416 } |
2152 | 2417 |
2418 { | |
2419 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 2420 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 2421 SecondaryFreeList_lock->notify_all(); |
2422 } | |
2423 | |
2424 if (G1StressConcRegionFreeing) { | |
2425 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2426 os::sleep(Thread::current(), (jlong) 1, false); | |
2427 } | |
2428 } | |
342 | 2429 } |
2430 } | |
2361 | 2431 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2432 } |
2433 | |
2174
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6608385: G1: need to support parallel reference processing
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2152
diff
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|
2434 // Support closures for reference procssing in G1 |
234761c55641
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diff
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|
2435 |
2037
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7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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diff
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|
2436 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
b03260081e9b
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diff
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|
2437 HeapWord* addr = (HeapWord*)obj; |
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7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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diff
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|
2438 return addr != NULL && |
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|
2439 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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2440 } |
342 | 2441 |
2442 class G1CMKeepAliveClosure: public OopClosure { | |
2443 G1CollectedHeap* _g1; | |
2444 ConcurrentMark* _cm; | |
2445 public: | |
4836
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2446 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
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2447 _g1(g1), _cm(cm) { |
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2448 assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
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2449 } |
342 | 2450 |
845
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2451 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2452 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2453 |
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2454 template <class T> void do_oop_work(T* p) { |
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2455 oop obj = oopDesc::load_decode_heap_oop(p); |
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2456 HeapWord* addr = (HeapWord*)obj; |
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2457 |
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2458 if (_cm->verbose_high()) { |
2174
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2459 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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2460 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2461 p, (void*) obj); |
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2462 } |
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2463 |
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2464 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
4836
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2465 _cm->mark_and_count(obj); |
2174
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2466 _cm->mark_stack_push(obj); |
342 | 2467 } |
2468 } | |
2469 }; | |
2470 | |
2471 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
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2472 ConcurrentMark* _cm; |
342 | 2473 CMMarkStack* _markStack; |
2474 G1CMKeepAliveClosure* _oopClosure; | |
2475 public: | |
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2476 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
342 | 2477 G1CMKeepAliveClosure* oopClosure) : |
4836
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2478 _cm(cm), |
342 | 2479 _markStack(markStack), |
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2480 _oopClosure(oopClosure) { } |
342 | 2481 |
2482 void do_void() { | |
4836
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2483 _markStack->drain((OopClosure*)_oopClosure, _cm->nextMarkBitMap(), false); |
342 | 2484 } |
2485 }; | |
2486 | |
2174
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2487 // 'Keep Alive' closure used by parallel reference processing. |
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2488 // An instance of this closure is used in the parallel reference processing |
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2489 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2490 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2491 // placed on to discovered ref lists once so we can mark and push with no |
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2492 // need to check whether the object has already been marked. Using the |
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2493 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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|
2494 // operating on the global mark stack. This means that an individual |
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|
2495 // worker would be doing lock-free pushes while it processes its own |
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|
2496 // discovered ref list followed by drain call. If the discovered ref lists |
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|
2497 // are unbalanced then this could cause interference with the other |
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|
2498 // workers. Using a CMTask (and its embedded local data structures) |
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|
2499 // avoids that potential interference. |
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2500 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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|
2501 ConcurrentMark* _cm; |
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|
2502 CMTask* _task; |
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|
2503 int _ref_counter_limit; |
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|
2504 int _ref_counter; |
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|
2505 public: |
4093
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|
2506 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2507 _cm(cm), _task(task), |
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2508 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
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2509 assert(_ref_counter_limit > 0, "sanity"); |
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|
2510 _ref_counter = _ref_counter_limit; |
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|
2511 } |
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|
2512 |
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|
2513 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
2514 virtual void do_oop( oop* p) { do_oop_work(p); } |
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|
2515 |
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|
2516 template <class T> void do_oop_work(T* p) { |
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|
2517 if (!_cm->has_overflown()) { |
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|
2518 oop obj = oopDesc::load_decode_heap_oop(p); |
3776
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|
2519 if (_cm->verbose_high()) { |
2174
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|
2520 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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|
2521 "*"PTR_FORMAT" = "PTR_FORMAT, |
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|
2522 _task->task_id(), p, (void*) obj); |
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|
2523 } |
2174
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|
2524 |
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|
2525 _task->deal_with_reference(obj); |
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|
2526 _ref_counter--; |
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|
2527 |
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|
2528 if (_ref_counter == 0) { |
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|
2529 // We have dealt with _ref_counter_limit references, pushing them and objects |
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|
2530 // reachable from them on to the local stack (and possibly the global stack). |
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|
2531 // Call do_marking_step() to process these entries. We call the routine in a |
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|
2532 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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|
2533 // with the entries that we've pushed as a result of the deal_with_reference |
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|
2534 // calls above) or we overflow. |
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|
2535 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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|
2536 // while there may still be some work to do. (See the comment at the |
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|
2537 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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|
2538 // is reaching the specified time target.) It is only when |
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|
2539 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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|
2540 // that the marking has completed. |
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|
2541 do { |
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|
2542 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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|
2543 _task->do_marking_step(mark_step_duration_ms, |
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|
2544 false /* do_stealing */, |
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|
2545 false /* do_termination */); |
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|
2546 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2547 _ref_counter = _ref_counter_limit; |
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|
2548 } |
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|
2549 } else { |
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|
2550 if (_cm->verbose_high()) { |
2174
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|
2551 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
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|
2552 } |
2174
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|
2553 } |
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|
2554 } |
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|
2555 }; |
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|
2556 |
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|
2557 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
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|
2558 ConcurrentMark* _cm; |
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|
2559 CMTask* _task; |
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|
2560 public: |
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|
2561 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
4836
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|
2562 _cm(cm), _task(task) { } |
2174
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|
2563 |
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|
2564 void do_void() { |
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|
2565 do { |
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|
2566 if (_cm->verbose_high()) { |
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|
2567 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
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|
2568 _task->task_id()); |
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|
2569 } |
2174
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|
2570 |
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|
2571 // We call CMTask::do_marking_step() to completely drain the local and |
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|
2572 // global marking stacks. The routine is called in a loop, which we'll |
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|
2573 // exit if there's nothing more to do (i.e. we'completely drained the |
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|
2574 // entries that were pushed as a result of applying the |
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|
2575 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
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|
2576 // lists above) or we overflow the global marking stack. |
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|
2577 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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|
2578 // while there may still be some work to do. (See the comment at the |
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|
2579 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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|
2580 // is reaching the specified time target.) It is only when |
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|
2581 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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|
2582 // that the marking has completed. |
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|
2583 |
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2584 _task->do_marking_step(1000000000.0 /* something very large */, |
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2585 true /* do_stealing */, |
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2586 true /* do_termination */); |
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2587 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2588 } |
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2589 }; |
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2590 |
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2591 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2592 // reference processing at the end of G1 concurrent marking |
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2593 |
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2594 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
2174
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2595 private: |
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2596 G1CollectedHeap* _g1h; |
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2597 ConcurrentMark* _cm; |
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2598 WorkGang* _workers; |
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2599 int _active_workers; |
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2600 |
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2601 public: |
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2602 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
2174
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2603 ConcurrentMark* cm, |
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2604 WorkGang* workers, |
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2605 int n_workers) : |
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2606 _g1h(g1h), _cm(cm), |
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2607 _workers(workers), _active_workers(n_workers) { } |
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2608 |
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2609 // Executes the given task using concurrent marking worker threads. |
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2610 virtual void execute(ProcessTask& task); |
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2611 virtual void execute(EnqueueTask& task); |
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2612 }; |
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2613 |
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2614 class G1CMRefProcTaskProxy: public AbstractGangTask { |
2174
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2615 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2616 ProcessTask& _proc_task; |
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2617 G1CollectedHeap* _g1h; |
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2618 ConcurrentMark* _cm; |
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2619 |
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2620 public: |
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2621 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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2622 G1CollectedHeap* g1h, |
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2623 ConcurrentMark* cm) : |
2174
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2624 AbstractGangTask("Process reference objects in parallel"), |
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2625 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
2174
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2626 |
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2627 virtual void work(uint worker_id) { |
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2628 CMTask* marking_task = _cm->task(worker_id); |
2174
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2629 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2630 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
2174
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2631 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2632 |
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2633 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
2174
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2634 } |
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2635 }; |
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2636 |
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2637 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
2174
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2638 assert(_workers != NULL, "Need parallel worker threads."); |
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2639 |
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2640 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
2174
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2641 |
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2642 // We need to reset the phase for each task execution so that |
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2643 // the termination protocol of CMTask::do_marking_step works. |
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2644 _cm->set_phase(_active_workers, false /* concurrent */); |
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2645 _g1h->set_par_threads(_active_workers); |
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2646 _workers->run_task(&proc_task_proxy); |
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|
2647 _g1h->set_par_threads(0); |
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|
2648 } |
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|
2649 |
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2650 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
2174
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2651 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
2652 EnqueueTask& _enq_task; |
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|
2653 |
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|
2654 public: |
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|
2655 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
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|
2656 AbstractGangTask("Enqueue reference objects in parallel"), |
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2657 _enq_task(enq_task) { } |
2174
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2658 |
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2659 virtual void work(uint worker_id) { |
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|
2660 _enq_task.work(worker_id); |
2174
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|
2661 } |
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|
2662 }; |
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|
2663 |
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|
2664 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
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|
2665 assert(_workers != NULL, "Need parallel worker threads."); |
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|
2666 |
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|
2667 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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|
2668 |
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|
2669 _g1h->set_par_threads(_active_workers); |
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|
2670 _workers->run_task(&enq_task_proxy); |
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|
2671 _g1h->set_par_threads(0); |
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|
2672 } |
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|
2673 |
342 | 2674 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
2675 ResourceMark rm; | |
2676 HandleMark hm; | |
3975
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|
2677 |
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|
2678 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
2679 |
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diff
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|
2680 // Is alive closure. |
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|
2681 G1CMIsAliveClosure g1_is_alive(g1h); |
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|
2682 |
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diff
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|
2683 // Inner scope to exclude the cleaning of the string and symbol |
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diff
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|
2684 // tables from the displayed time. |
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|
2685 { |
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|
2686 bool verbose = PrintGC && PrintGCDetails; |
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|
2687 if (verbose) { |
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diff
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|
2688 gclog_or_tty->put(' '); |
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|
2689 } |
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|
2690 TraceTime t("GC ref-proc", verbose, false, gclog_or_tty); |
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|
2691 |
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2692 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
3975
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|
2693 |
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2694 // See the comment in G1CollectedHeap::ref_processing_init() |
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|
2695 // about how reference processing currently works in G1. |
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|
2696 |
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diff
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|
2697 // Process weak references. |
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|
2698 rp->setup_policy(clear_all_soft_refs); |
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|
2699 assert(_markStack.isEmpty(), "mark stack should be empty"); |
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|
2700 |
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|
2701 G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
3975
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|
2702 G1CMDrainMarkingStackClosure |
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|
2703 g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
3975
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|
2704 |
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|
2705 // We use the work gang from the G1CollectedHeap and we utilize all |
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|
2706 // the worker threads. |
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|
2707 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
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2708 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
3975
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2709 |
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2710 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
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|
2711 g1h->workers(), active_workers); |
3975
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|
2712 |
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|
2713 if (rp->processing_is_mt()) { |
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|
2714 // Set the degree of MT here. If the discovery is done MT, there |
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|
2715 // may have been a different number of threads doing the discovery |
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diff
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|
2716 // and a different number of discovered lists may have Ref objects. |
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|
2717 // That is OK as long as the Reference lists are balanced (see |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2718 // balance_all_queues() and balance_queues()). |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2719 rp->set_active_mt_degree(active_workers); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2720 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2721 rp->process_discovered_references(&g1_is_alive, |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
2722 &g1_keep_alive, |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2723 &g1_drain_mark_stack, |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2724 &par_task_executor); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2725 |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2726 // The work routines of the parallel keep_alive and drain_marking_stack |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2727 // will set the has_overflown flag if we overflow the global marking |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2728 // stack. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2729 } else { |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2730 rp->process_discovered_references(&g1_is_alive, |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2731 &g1_keep_alive, |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2732 &g1_drain_mark_stack, |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2733 NULL); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2734 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2735 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2736 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2737 "mark stack should be empty (unless it overflowed)"); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2738 if (_markStack.overflow()) { |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2739 // Should have been done already when we tried to push an |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2740 // entry on to the global mark stack. But let's do it again. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2741 set_has_overflown(); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2742 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2743 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2744 if (rp->processing_is_mt()) { |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2745 assert(rp->num_q() == active_workers, "why not"); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2746 rp->enqueue_discovered_references(&par_task_executor); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2747 } else { |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2748 rp->enqueue_discovered_references(); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2749 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2750 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2751 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2752 assert(!rp->discovery_enabled(), "Post condition"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2753 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2754 |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2755 // Now clean up stale oops in StringTable |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2756 StringTable::unlink(&g1_is_alive); |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2757 // Clean up unreferenced symbols in symbol table. |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2175
diff
changeset
|
2758 SymbolTable::unlink(); |
342 | 2759 } |
2760 | |
2761 void ConcurrentMark::swapMarkBitMaps() { | |
2762 CMBitMapRO* temp = _prevMarkBitMap; | |
2763 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2764 _nextMarkBitMap = (CMBitMap*) temp; | |
2765 } | |
2766 | |
2767 class CMRemarkTask: public AbstractGangTask { | |
2768 private: | |
2769 ConcurrentMark *_cm; | |
2770 | |
2771 public: | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2772 void work(uint worker_id) { |
342 | 2773 // Since all available tasks are actually started, we should |
2774 // only proceed if we're supposed to be actived. | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2775 if (worker_id < _cm->active_tasks()) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2776 CMTask* task = _cm->task(worker_id); |
342 | 2777 task->record_start_time(); |
2778 do { | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2779 task->do_marking_step(1000000000.0 /* something very large */, |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2780 true /* do_stealing */, |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2781 true /* do_termination */); |
342 | 2782 } while (task->has_aborted() && !_cm->has_overflown()); |
2783 // If we overflow, then we do not want to restart. We instead | |
2784 // want to abort remark and do concurrent marking again. | |
2785 task->record_end_time(); | |
2786 } | |
2787 } | |
2788 | |
4711 | 2789 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2790 AbstractGangTask("Par Remark"), _cm(cm) { |
4711 | 2791 _cm->terminator()->reset_for_reuse(active_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2792 } |
342 | 2793 }; |
2794 | |
2795 void ConcurrentMark::checkpointRootsFinalWork() { | |
2796 ResourceMark rm; | |
2797 HandleMark hm; | |
2798 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2799 | |
2800 g1h->ensure_parsability(false); | |
2801 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2802 if (G1CollectedHeap::use_parallel_gc_threads()) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2803 G1CollectedHeap::StrongRootsScope srs(g1h); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2804 // this is remark, so we'll use up all active threads |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2805 uint active_workers = g1h->workers()->active_workers(); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2806 if (active_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2807 assert(active_workers > 0, "Should have been set earlier"); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2808 active_workers = (uint) ParallelGCThreads; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2809 g1h->workers()->set_active_workers(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2810 } |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2811 set_phase(active_workers, false /* concurrent */); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2812 // Leave _parallel_marking_threads at it's |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2813 // value originally calculated in the ConcurrentMark |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2814 // constructor and pass values of the active workers |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2815 // through the gang in the task. |
342 | 2816 |
4711 | 2817 CMRemarkTask remarkTask(this, active_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2818 g1h->set_par_threads(active_workers); |
342 | 2819 g1h->workers()->run_task(&remarkTask); |
2820 g1h->set_par_threads(0); | |
2821 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2822 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2823 // this is remark, so we'll use up all available threads |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2824 uint active_workers = 1; |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2825 set_phase(active_workers, false /* concurrent */); |
342 | 2826 |
4711 | 2827 CMRemarkTask remarkTask(this, active_workers); |
342 | 2828 // We will start all available threads, even if we decide that the |
2829 // active_workers will be fewer. The extra ones will just bail out | |
2830 // immediately. | |
2831 remarkTask.work(0); | |
2832 } | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2833 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2834 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2835 |
2836 print_stats(); | |
2837 | |
2838 #if VERIFY_OBJS_PROCESSED | |
2839 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
2840 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
2841 _scan_obj_cl.objs_processed, | |
2842 ThreadLocalObjQueue::objs_enqueued); | |
2843 guarantee(_scan_obj_cl.objs_processed == | |
2844 ThreadLocalObjQueue::objs_enqueued, | |
2845 "Different number of objs processed and enqueued."); | |
2846 } | |
2847 #endif | |
2848 } | |
2849 | |
1044 | 2850 #ifndef PRODUCT |
2851 | |
1388 | 2852 class PrintReachableOopClosure: public OopClosure { |
342 | 2853 private: |
2854 G1CollectedHeap* _g1h; | |
2855 outputStream* _out; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2856 VerifyOption _vo; |
1388 | 2857 bool _all; |
342 | 2858 |
2859 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2860 PrintReachableOopClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2861 VerifyOption vo, |
1388 | 2862 bool all) : |
1044 | 2863 _g1h(G1CollectedHeap::heap()), |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2864 _out(out), _vo(vo), _all(all) { } |
342 | 2865 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2866 void do_oop(narrowOop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2867 void do_oop( oop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2868 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2869 template <class T> void do_oop_work(T* p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2870 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2871 const char* str = NULL; |
2872 const char* str2 = ""; | |
2873 | |
1388 | 2874 if (obj == NULL) { |
2875 str = ""; | |
2876 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2877 str = " O"; | |
2878 } else { | |
342 | 2879 HeapRegion* hr = _g1h->heap_region_containing(obj); |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2880 guarantee(hr != NULL, "invariant"); |
1044 | 2881 bool over_tams = false; |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2882 bool marked = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2883 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2884 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2885 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2886 over_tams = hr->obj_allocated_since_prev_marking(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2887 marked = _g1h->isMarkedPrev(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2888 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2889 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2890 over_tams = hr->obj_allocated_since_next_marking(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2891 marked = _g1h->isMarkedNext(obj); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2892 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2893 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2894 marked = obj->is_gc_marked(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2895 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2896 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2897 ShouldNotReachHere(); |
1044 | 2898 } |
2899 | |
2900 if (over_tams) { | |
1388 | 2901 str = " >"; |
2902 if (marked) { | |
342 | 2903 str2 = " AND MARKED"; |
1044 | 2904 } |
1388 | 2905 } else if (marked) { |
2906 str = " M"; | |
1044 | 2907 } else { |
1388 | 2908 str = " NOT"; |
1044 | 2909 } |
342 | 2910 } |
2911 | |
1388 | 2912 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2913 p, (void*) obj, str, str2); |
2914 } | |
2915 }; | |
2916 | |
1388 | 2917 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2918 private: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2919 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2920 outputStream* _out; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2921 VerifyOption _vo; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2922 bool _all; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2923 HeapRegion* _hr; |
342 | 2924 |
2925 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2926 PrintReachableObjectClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2927 VerifyOption vo, |
1388 | 2928 bool all, |
2929 HeapRegion* hr) : | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2930 _g1h(G1CollectedHeap::heap()), |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2931 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2932 |
2933 void do_object(oop o) { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2934 bool over_tams = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2935 bool marked = false; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2936 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2937 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2938 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2939 over_tams = _hr->obj_allocated_since_prev_marking(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2940 marked = _g1h->isMarkedPrev(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2941 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2942 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2943 over_tams = _hr->obj_allocated_since_next_marking(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2944 marked = _g1h->isMarkedNext(o); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2945 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2946 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2947 marked = o->is_gc_marked(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2948 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2949 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2950 ShouldNotReachHere(); |
1388 | 2951 } |
2952 bool print_it = _all || over_tams || marked; | |
2953 | |
2954 if (print_it) { | |
2955 _out->print_cr(" "PTR_FORMAT"%s", | |
2956 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2957 PrintReachableOopClosure oopCl(_out, _vo, _all); |
1388 | 2958 o->oop_iterate(&oopCl); |
2959 } | |
342 | 2960 } |
2961 }; | |
2962 | |
1388 | 2963 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2964 private: |
2965 outputStream* _out; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2966 VerifyOption _vo; |
1388 | 2967 bool _all; |
342 | 2968 |
2969 public: | |
2970 bool doHeapRegion(HeapRegion* hr) { | |
2971 HeapWord* b = hr->bottom(); | |
2972 HeapWord* e = hr->end(); | |
2973 HeapWord* t = hr->top(); | |
1044 | 2974 HeapWord* p = NULL; |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2975 |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2976 switch (_vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2977 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2978 p = hr->prev_top_at_mark_start(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2979 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2980 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2981 p = hr->next_top_at_mark_start(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2982 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2983 case VerifyOption_G1UseMarkWord: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2984 // When we are verifying marking using the mark word |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2985 // TAMS has no relevance. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2986 assert(p == NULL, "post-condition"); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2987 break; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2988 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2989 ShouldNotReachHere(); |
1044 | 2990 } |
342 | 2991 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2992 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2993 _out->cr(); |
2994 | |
2995 HeapWord* from = b; | |
2996 HeapWord* to = t; | |
2997 | |
2998 if (to > from) { | |
2999 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
3000 _out->cr(); | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3001 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 3002 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
3003 _out->cr(); | |
3004 } | |
342 | 3005 |
3006 return false; | |
3007 } | |
3008 | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3009 PrintReachableRegionClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3010 VerifyOption vo, |
1388 | 3011 bool all) : |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3012 _out(out), _vo(vo), _all(all) { } |
342 | 3013 }; |
3014 | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3015 static const char* verify_option_to_tams(VerifyOption vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3016 switch (vo) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3017 case VerifyOption_G1UsePrevMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3018 return "PTAMS"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3019 case VerifyOption_G1UseNextMarking: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3020 return "NTAMS"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3021 default: |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3022 return "NONE"; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3023 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3024 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3025 |
1388 | 3026 void ConcurrentMark::print_reachable(const char* str, |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3027 VerifyOption vo, |
1388 | 3028 bool all) { |
3029 gclog_or_tty->cr(); | |
3030 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 3031 |
3032 if (G1PrintReachableBaseFile == NULL) { | |
3033 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
3034 return; | |
3035 } | |
3036 | |
3037 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
3038 (JVM_MAXPATHLEN - 1)) { | |
3039 gclog_or_tty->print_cr(" #### error: file name too long"); | |
3040 return; | |
3041 } | |
3042 | |
3043 char file_name[JVM_MAXPATHLEN]; | |
3044 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
3045 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
3046 | |
3047 fileStream fout(file_name); | |
3048 if (!fout.is_open()) { | |
3049 gclog_or_tty->print_cr(" #### error: could not open file"); | |
3050 return; | |
3051 } | |
3052 | |
3053 outputStream* out = &fout; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3054 out->print_cr("-- USING %s", verify_option_to_tams(vo)); |
1044 | 3055 out->cr(); |
3056 | |
1388 | 3057 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 3058 out->cr(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
3059 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 3060 _g1h->heap_region_iterate(&rcl); |
1044 | 3061 out->cr(); |
3062 | |
3063 gclog_or_tty->print_cr(" done"); | |
1388 | 3064 gclog_or_tty->flush(); |
342 | 3065 } |
3066 | |
1044 | 3067 #endif // PRODUCT |
3068 | |
342 | 3069 // This note is for drainAllSATBBuffers and the code in between. |
3070 // In the future we could reuse a task to do this work during an | |
3071 // evacuation pause (since now tasks are not active and can be claimed | |
3072 // during an evacuation pause). This was a late change to the code and | |
3073 // is currently not being taken advantage of. | |
3074 | |
3075 void ConcurrentMark::deal_with_reference(oop obj) { | |
3771 | 3076 if (verbose_high()) { |
342 | 3077 gclog_or_tty->print_cr("[global] we're dealing with reference "PTR_FORMAT, |
3078 (void*) obj); | |
3771 | 3079 } |
342 | 3080 |
3081 HeapWord* objAddr = (HeapWord*) obj; | |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
3082 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
342 | 3083 if (_g1h->is_in_g1_reserved(objAddr)) { |
3771 | 3084 assert(obj != NULL, "null check is implicit"); |
3085 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
3086 // Only get the containing region if the object is not marked on the | |
3087 // bitmap (otherwise, it's a waste of time since we won't do | |
3088 // anything with it). | |
3089 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
3090 if (!hr->obj_allocated_since_next_marking(obj)) { | |
3091 if (verbose_high()) { | |
3092 gclog_or_tty->print_cr("[global] "PTR_FORMAT" is not considered " | |
3093 "marked", (void*) obj); | |
3094 } | |
3095 | |
3096 // we need to mark it first | |
3097 if (_nextMarkBitMap->parMark(objAddr)) { | |
3098 // No OrderAccess:store_load() is needed. It is implicit in the | |
3099 // CAS done in parMark(objAddr) above | |
3100 HeapWord* finger = _finger; | |
3101 if (objAddr < finger) { | |
3102 if (verbose_high()) { | |
3103 gclog_or_tty->print_cr("[global] below the global finger " | |
3104 "("PTR_FORMAT"), pushing it", finger); | |
3105 } | |
3106 if (!mark_stack_push(obj)) { | |
3107 if (verbose_low()) { | |
3108 gclog_or_tty->print_cr("[global] global stack overflow during " | |
3109 "deal_with_reference"); | |
3110 } | |
3111 } | |
342 | 3112 } |
3113 } | |
3114 } | |
3115 } | |
3116 } | |
3117 } | |
3118 | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3119 class CMGlobalObjectClosure : public ObjectClosure { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3120 private: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3121 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3122 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3123 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3124 void do_object(oop obj) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3125 _cm->deal_with_reference(obj); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3126 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3127 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3128 CMGlobalObjectClosure(ConcurrentMark* cm) : _cm(cm) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3129 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3130 |
342 | 3131 void ConcurrentMark::drainAllSATBBuffers() { |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3132 guarantee(false, "drainAllSATBBuffers(): don't call this any more"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3133 |
342 | 3134 CMGlobalObjectClosure oc(this); |
3135 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3136 satb_mq_set.set_closure(&oc); | |
3137 | |
3138 while (satb_mq_set.apply_closure_to_completed_buffer()) { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3139 if (verbose_medium()) { |
342 | 3140 gclog_or_tty->print_cr("[global] processed an SATB buffer"); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3141 } |
342 | 3142 } |
3143 | |
3144 // no need to check whether we should do this, as this is only | |
3145 // called during an evacuation pause | |
3146 satb_mq_set.iterate_closure_all_threads(); | |
3147 | |
3148 satb_mq_set.set_closure(NULL); | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3149 assert(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3150 } |
3151 | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3152 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 3153 // Note we are overriding the read-only view of the prev map here, via |
3154 // the cast. | |
3155 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3156 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3157 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3158 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 3159 _nextMarkBitMap->clearRange(mr); |
3160 } | |
3161 | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3162 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3163 clearRangePrevBitmap(mr); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3164 clearRangeNextBitmap(mr); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3165 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3166 |
342 | 3167 HeapRegion* |
3168 ConcurrentMark::claim_region(int task_num) { | |
3169 // "checkpoint" the finger | |
3170 HeapWord* finger = _finger; | |
3171 | |
3172 // _heap_end will not change underneath our feet; it only changes at | |
3173 // yield points. | |
3174 while (finger < _heap_end) { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3175 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 3176 |
3771 | 3177 // Note on how this code handles humongous regions. In the |
3178 // normal case the finger will reach the start of a "starts | |
3179 // humongous" (SH) region. Its end will either be the end of the | |
3180 // last "continues humongous" (CH) region in the sequence, or the | |
3181 // standard end of the SH region (if the SH is the only region in | |
3182 // the sequence). That way claim_region() will skip over the CH | |
3183 // regions. However, there is a subtle race between a CM thread | |
3184 // executing this method and a mutator thread doing a humongous | |
3185 // object allocation. The two are not mutually exclusive as the CM | |
3186 // thread does not need to hold the Heap_lock when it gets | |
3187 // here. So there is a chance that claim_region() will come across | |
3188 // a free region that's in the progress of becoming a SH or a CH | |
3189 // region. In the former case, it will either | |
3190 // a) Miss the update to the region's end, in which case it will | |
3191 // visit every subsequent CH region, will find their bitmaps | |
3192 // empty, and do nothing, or | |
3193 // b) Will observe the update of the region's end (in which case | |
3194 // it will skip the subsequent CH regions). | |
3195 // If it comes across a region that suddenly becomes CH, the | |
3196 // scenario will be similar to b). So, the race between | |
3197 // claim_region() and a humongous object allocation might force us | |
3198 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
3199 // iterations) but it should not introduce and correctness issues. | |
3200 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 3201 HeapWord* bottom = curr_region->bottom(); |
3202 HeapWord* end = curr_region->end(); | |
3203 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
3204 | |
3771 | 3205 if (verbose_low()) { |
342 | 3206 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
3207 "["PTR_FORMAT", "PTR_FORMAT"), " | |
3208 "limit = "PTR_FORMAT, | |
3209 task_num, curr_region, bottom, end, limit); | |
3771 | 3210 } |
3211 | |
3212 // Is the gap between reading the finger and doing the CAS too long? | |
3213 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 3214 if (res == finger) { |
3215 // we succeeded | |
3216 | |
3217 // notice that _finger == end cannot be guaranteed here since, | |
3218 // someone else might have moved the finger even further | |
1023
11d4857fe5e1
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|
3219 assert(_finger >= end, "the finger should have moved forward"); |
342 | 3220 |
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|
3221 if (verbose_low()) { |
342 | 3222 gclog_or_tty->print_cr("[%d] we were successful with region = " |
3223 PTR_FORMAT, task_num, curr_region); | |
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|
3224 } |
342 | 3225 |
3226 if (limit > bottom) { | |
3776
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|
3227 if (verbose_low()) { |
342 | 3228 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
3229 "returning it ", task_num, curr_region); | |
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|
3230 } |
342 | 3231 return curr_region; |
3232 } else { | |
1023
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|
3233 assert(limit == bottom, |
11d4857fe5e1
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|
3234 "the region limit should be at bottom"); |
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|
3235 if (verbose_low()) { |
342 | 3236 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
3237 "returning NULL", task_num, curr_region); | |
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|
3238 } |
342 | 3239 // we return NULL and the caller should try calling |
3240 // claim_region() again. | |
3241 return NULL; | |
3242 } | |
3243 } else { | |
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|
3244 assert(_finger > finger, "the finger should have moved forward"); |
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|
3245 if (verbose_low()) { |
342 | 3246 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
3247 "global finger = "PTR_FORMAT", " | |
3248 "our finger = "PTR_FORMAT, | |
3249 task_num, _finger, finger); | |
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|
3250 } |
342 | 3251 |
3252 // read it again | |
3253 finger = _finger; | |
3254 } | |
3255 } | |
3256 | |
3257 return NULL; | |
3258 } | |
3259 | |
1835
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|
3260 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
4787
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|
3261 guarantee(false, "invalidate_aborted_regions_in_cset(): " |
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|
3262 "don't call this any more"); |
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|
3263 |
1835
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|
3264 bool result = false; |
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|
3265 for (int i = 0; i < (int)_max_task_num; ++i) { |
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|
3266 CMTask* the_task = _tasks[i]; |
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|
3267 MemRegion mr = the_task->aborted_region(); |
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|
3268 if (mr.start() != NULL) { |
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|
3269 assert(mr.end() != NULL, "invariant"); |
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|
3270 assert(mr.word_size() > 0, "invariant"); |
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|
3271 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
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|
3272 assert(hr != NULL, "invariant"); |
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|
3273 if (hr->in_collection_set()) { |
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|
3274 // The region points into the collection set |
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|
3275 the_task->set_aborted_region(MemRegion()); |
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|
3276 result = true; |
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|
3277 } |
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|
3278 } |
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|
3279 } |
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|
3280 return result; |
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|
3281 } |
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|
3282 |
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|
3283 bool ConcurrentMark::has_aborted_regions() { |
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|
3284 for (int i = 0; i < (int)_max_task_num; ++i) { |
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|
3285 CMTask* the_task = _tasks[i]; |
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|
3286 MemRegion mr = the_task->aborted_region(); |
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|
3287 if (mr.start() != NULL) { |
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|
3288 assert(mr.end() != NULL, "invariant"); |
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|
3289 assert(mr.word_size() > 0, "invariant"); |
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|
3290 return true; |
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|
3291 } |
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|
3292 } |
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|
3293 return false; |
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|
3294 } |
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|
3295 |
342 | 3296 void ConcurrentMark::oops_do(OopClosure* cl) { |
3776
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|
3297 if (_markStack.size() > 0 && verbose_low()) { |
342 | 3298 gclog_or_tty->print_cr("[global] scanning the global marking stack, " |
3299 "size = %d", _markStack.size()); | |
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|
3300 } |
342 | 3301 // we first iterate over the contents of the mark stack... |
3302 _markStack.oops_do(cl); | |
3303 | |
3304 for (int i = 0; i < (int)_max_task_num; ++i) { | |
3305 OopTaskQueue* queue = _task_queues->queue((int)i); | |
3306 | |
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|
3307 if (queue->size() > 0 && verbose_low()) { |
342 | 3308 gclog_or_tty->print_cr("[global] scanning task queue of task %d, " |
3309 "size = %d", i, queue->size()); | |
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|
3310 } |
342 | 3311 |
3312 // ...then over the contents of the all the task queues. | |
3313 queue->oops_do(cl); | |
3314 } | |
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|
3315 } |
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|
3316 |
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|
3317 #ifndef PRODUCT |
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|
3318 enum VerifyNoCSetOopsPhase { |
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|
3319 VerifyNoCSetOopsStack, |
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|
3320 VerifyNoCSetOopsQueues, |
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|
3321 VerifyNoCSetOopsSATBCompleted, |
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|
3322 VerifyNoCSetOopsSATBThread |
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|
3323 }; |
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|
3324 |
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|
3325 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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|
3326 private: |
2ace1c4ee8da
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|
3327 G1CollectedHeap* _g1h; |
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|
3328 VerifyNoCSetOopsPhase _phase; |
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|
3329 int _info; |
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|
3330 |
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|
3331 const char* phase_str() { |
2ace1c4ee8da
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|
3332 switch (_phase) { |
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|
3333 case VerifyNoCSetOopsStack: return "Stack"; |
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|
3334 case VerifyNoCSetOopsQueues: return "Queue"; |
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|
3335 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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|
3336 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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|
3337 default: ShouldNotReachHere(); |
2ace1c4ee8da
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|
3338 } |
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|
3339 return NULL; |
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|
3340 } |
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|
3341 |
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|
3342 void do_object_work(oop obj) { |
2ace1c4ee8da
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|
3343 guarantee(!_g1h->obj_in_cs(obj), |
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|
3344 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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|
3345 (void*) obj, phase_str(), _info)); |
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|
3346 } |
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|
3347 |
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|
3348 public: |
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|
3349 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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|
3350 |
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|
3351 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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|
3352 _phase = phase; |
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|
3353 _info = info; |
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|
3354 } |
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|
3355 |
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|
3356 virtual void do_oop(oop* p) { |
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|
3357 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
3358 do_object_work(obj); |
2ace1c4ee8da
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|
3359 } |
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|
3360 |
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|
3361 virtual void do_oop(narrowOop* p) { |
2ace1c4ee8da
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|
3362 // We should not come across narrow oops while scanning marking |
2ace1c4ee8da
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|
3363 // stacks and SATB buffers. |
2ace1c4ee8da
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|
3364 ShouldNotReachHere(); |
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|
3365 } |
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|
3366 |
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|
3367 virtual void do_object(oop obj) { |
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|
3368 do_object_work(obj); |
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|
3369 } |
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|
3370 }; |
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|
3371 |
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|
3372 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
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|
3373 bool verify_enqueued_buffers, |
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|
3374 bool verify_thread_buffers, |
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|
3375 bool verify_fingers) { |
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changeset
|
3376 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3377 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3378 return; |
342 | 3379 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3380 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3381 VerifyNoCSetOopsClosure cl; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3382 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3383 if (verify_stacks) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3384 // Verify entries on the global mark stack |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3385 cl.set_phase(VerifyNoCSetOopsStack); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3386 _markStack.oops_do(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3387 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3388 // Verify entries on the task queues |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3389 for (int i = 0; i < (int) _max_task_num; i += 1) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3390 cl.set_phase(VerifyNoCSetOopsQueues, i); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3391 OopTaskQueue* queue = _task_queues->queue(i); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3392 queue->oops_do(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3393 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3394 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3395 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3396 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3397 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3398 // Verify entries on the enqueued SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3399 if (verify_enqueued_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3400 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3401 satb_qs.iterate_completed_buffers_read_only(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3402 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3403 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3404 // Verify entries on the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3405 if (verify_thread_buffers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3406 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3407 satb_qs.iterate_thread_buffers_read_only(&cl); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3408 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3409 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3410 if (verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3411 // Verify the global finger |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3412 HeapWord* global_finger = finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3413 if (global_finger != NULL && global_finger < _heap_end) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3414 // The global finger always points to a heap region boundary. We |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3415 // use heap_region_containing_raw() to get the containing region |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3416 // given that the global finger could be pointing to a free region |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3417 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3418 // happens, heap_region_containing() will return the bottom of the |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3419 // corresponding starts humongous region and the check below will |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3420 // not hold any more. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3421 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3422 guarantee(global_finger == global_hr->bottom(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3423 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3424 global_finger, HR_FORMAT_PARAMS(global_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3425 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3426 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3427 // Verify the task fingers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3428 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3429 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3430 CMTask* task = _tasks[i]; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3431 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3432 if (task_finger != NULL && task_finger < _heap_end) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3433 // See above note on the global finger verification. |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3434 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3435 guarantee(task_finger == task_hr->bottom() || |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3436 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3437 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3438 task_finger, HR_FORMAT_PARAMS(task_hr))); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3439 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3440 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3441 } |
342 | 3442 } |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3443 #endif // PRODUCT |
342 | 3444 |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3445 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
342 | 3446 _markStack.setEmpty(); |
3447 _markStack.clear_overflow(); | |
3448 _regionStack.setEmpty(); | |
3449 _regionStack.clear_overflow(); | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3450 if (clear_overflow) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3451 clear_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3452 } else { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3453 assert(has_overflown(), "pre-condition"); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
3454 } |
342 | 3455 _finger = _heap_start; |
3456 | |
3457 for (int i = 0; i < (int)_max_task_num; ++i) { | |
3458 OopTaskQueue* queue = _task_queues->queue(i); | |
3459 queue->set_empty(); | |
1885
a5c514e74487
6988458: G1: assert(mr.end() <= _cm->finger()) failed: otherwise the region shouldn't be on the stack
johnc
parents:
1835
diff
changeset
|
3460 // Clear any partial regions from the CMTasks |
a5c514e74487
6988458: G1: assert(mr.end() <= _cm->finger()) failed: otherwise the region shouldn't be on the stack
johnc
parents:
1835
diff
changeset
|
3461 _tasks[i]->clear_aborted_region(); |
342 | 3462 } |
3463 } | |
3464 | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3465 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3466 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3467 class AggregateCountDataHRClosure: public HeapRegionClosure { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3468 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3469 BitMap* _cm_card_bm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3470 size_t _max_task_num; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3471 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3472 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3473 AggregateCountDataHRClosure(ConcurrentMark *cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3474 BitMap* cm_card_bm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3475 size_t max_task_num) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3476 _cm(cm), _cm_card_bm(cm_card_bm), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3477 _max_task_num(max_task_num) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3478 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3479 bool is_card_aligned(HeapWord* p) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3480 return ((uintptr_t(p) & (CardTableModRefBS::card_size - 1)) == 0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3481 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3482 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3483 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3484 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3485 // We will ignore these here and process them when their |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3486 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3487 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3488 // "starts humongous" region to have their bit set to 1 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3489 // since, due to the region chunking in the parallel region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3490 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3491 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3492 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3493 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3494 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3495 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3496 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3497 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3498 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3499 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3500 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3501 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3502 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3503 start, limit, hr->top(), hr->end())); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3504 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3505 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3506 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3507 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3508 // NTAMS of this region has not been set so nothing to do. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3509 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3510 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3511 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3512 assert(is_card_aligned(start), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3513 assert(is_card_aligned(end), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3514 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3515 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3516 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3517 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3518 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3519 // If ntams is not card aligned then we bump the index for |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3520 // limit so that we get the card spanning ntams. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3521 if (!is_card_aligned(limit)) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3522 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3523 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3524 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3525 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3526 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3527 // Aggregate the "stripe" in the count data associated with hr. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3528 size_t hrs_index = hr->hrs_index(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3529 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3530 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3531 for (int i = 0; (size_t)i < _max_task_num; i += 1) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3532 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3533 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3534 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3535 // Fetch the marked_bytes in this region for task i and |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3536 // add it to the running total for this region. |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3537 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3538 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3539 // Now union the bitmaps[0,max_task_num)[start_idx..limit_idx) |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3540 // into the global card bitmap. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3541 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3542 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3543 while (scan_idx < limit_idx) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3544 assert(task_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3545 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3546 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3547 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3548 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3549 // its left_offset parameter is greater than its right_offset |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3550 // parameter. If does, however, have an early exit if |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3551 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3552 // passed in for left offset here. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3553 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3554 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3555 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3556 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3557 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3558 // Update the marked bytes for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3559 hr->add_to_marked_bytes(marked_bytes); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3560 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3561 // Now set the top at count to NTAMS. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3562 hr->set_top_at_conc_mark_count(limit); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3563 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3564 // Next heap region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3565 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3566 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3567 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3568 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3569 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3570 protected: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3571 G1CollectedHeap* _g1h; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3572 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3573 BitMap* _cm_card_bm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3574 size_t _max_task_num; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3575 int _active_workers; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3576 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3577 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3578 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3579 ConcurrentMark* cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3580 BitMap* cm_card_bm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3581 size_t max_task_num, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3582 int n_workers) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3583 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3584 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3585 _max_task_num(max_task_num), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3586 _active_workers(n_workers) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3587 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3588 void work(uint worker_id) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3589 AggregateCountDataHRClosure cl(_cm, _cm_card_bm, _max_task_num); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3590 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3591 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3592 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3593 _active_workers, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3594 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3595 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3596 _g1h->heap_region_iterate(&cl); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3597 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3598 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3599 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3600 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3601 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3602 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3603 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3604 _g1h->workers()->active_workers() : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3605 1); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3606 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3607 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3608 _max_task_num, n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3609 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3610 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3611 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3612 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3613 _g1h->set_par_threads(n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3614 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3615 _g1h->set_par_threads(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3616 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3617 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3618 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3619 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3620 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3621 g1_par_agg_task.work(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3622 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3623 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3624 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3625 // Clear the per-worker arrays used to store the per-region counting data |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3626 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3627 // Clear the global card bitmap - it will be filled during |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3628 // liveness count aggregation (during remark) and the |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3629 // final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3630 _card_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3631 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3632 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3633 // of the final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3634 _region_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3635 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3636 size_t max_regions = _g1h->max_regions(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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3637 assert(_max_task_num != 0, "unitialized"); |
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3638 |
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3639 for (int i = 0; (size_t) i < _max_task_num; i += 1) { |
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3640 BitMap* task_card_bm = count_card_bitmap_for(i); |
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3641 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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3642 |
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3643 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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3644 assert(marked_bytes_array != NULL, "uninitialized"); |
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3645 |
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3646 memset(marked_bytes_array, 0, (max_regions * sizeof(size_t))); |
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3647 task_card_bm->clear(); |
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3648 } |
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3649 } |
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3650 |
342 | 3651 void ConcurrentMark::print_stats() { |
3652 if (verbose_stats()) { | |
3653 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3654 for (size_t i = 0; i < _active_tasks; ++i) { | |
3655 _tasks[i]->print_stats(); | |
3656 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3657 } | |
3658 } | |
3659 } | |
3660 | |
4097
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3661 // Closures used by ConcurrentMark::complete_marking_in_collection_set(). |
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3662 |
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3663 class CSetMarkOopClosure: public OopClosure { |
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3664 friend class CSetMarkBitMapClosure; |
342 | 3665 |
3666 G1CollectedHeap* _g1h; | |
3667 CMBitMap* _bm; | |
3668 ConcurrentMark* _cm; | |
3669 oop* _ms; | |
3670 jint* _array_ind_stack; | |
3671 int _ms_size; | |
3672 int _ms_ind; | |
3673 int _array_increment; | |
4728
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3674 uint _worker_id; |
342 | 3675 |
3676 bool push(oop obj, int arr_ind = 0) { | |
3677 if (_ms_ind == _ms_size) { | |
3678 gclog_or_tty->print_cr("Mark stack is full."); | |
3679 return false; | |
3680 } | |
3681 _ms[_ms_ind] = obj; | |
3776
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3682 if (obj->is_objArray()) { |
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3683 _array_ind_stack[_ms_ind] = arr_ind; |
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3684 } |
342 | 3685 _ms_ind++; |
3686 return true; | |
3687 } | |
3688 | |
3689 oop pop() { | |
3776
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3690 if (_ms_ind == 0) { |
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3691 return NULL; |
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|
3692 } else { |
342 | 3693 _ms_ind--; |
3694 return _ms[_ms_ind]; | |
3695 } | |
3696 } | |
3697 | |
845
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3698 template <class T> bool drain() { |
342 | 3699 while (_ms_ind > 0) { |
3700 oop obj = pop(); | |
3701 assert(obj != NULL, "Since index was non-zero."); | |
3702 if (obj->is_objArray()) { | |
3703 jint arr_ind = _array_ind_stack[_ms_ind]; | |
3704 objArrayOop aobj = objArrayOop(obj); | |
3705 jint len = aobj->length(); | |
3706 jint next_arr_ind = arr_ind + _array_increment; | |
3707 if (next_arr_ind < len) { | |
3708 push(obj, next_arr_ind); | |
3709 } | |
3710 // Now process this portion of this one. | |
3711 int lim = MIN2(next_arr_ind, len); | |
3712 for (int j = arr_ind; j < lim; j++) { | |
912
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3713 do_oop(aobj->objArrayOopDesc::obj_at_addr<T>(j)); |
342 | 3714 } |
3715 } else { | |
3716 obj->oop_iterate(this); | |
3717 } | |
3718 if (abort()) return false; | |
3719 } | |
3720 return true; | |
3721 } | |
3722 | |
3723 public: | |
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3724 CSetMarkOopClosure(ConcurrentMark* cm, int ms_size, uint worker_id) : |
342 | 3725 _g1h(G1CollectedHeap::heap()), |
3726 _cm(cm), | |
3727 _bm(cm->nextMarkBitMap()), | |
3728 _ms_size(ms_size), _ms_ind(0), | |
3729 _ms(NEW_C_HEAP_ARRAY(oop, ms_size)), | |
3730 _array_ind_stack(NEW_C_HEAP_ARRAY(jint, ms_size)), | |
4097
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3731 _array_increment(MAX2(ms_size/8, 16)), |
4728
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3732 _worker_id(worker_id) { } |
4097
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3733 |
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|
3734 ~CSetMarkOopClosure() { |
342 | 3735 FREE_C_HEAP_ARRAY(oop, _ms); |
3736 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
3737 } | |
3738 | |
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3739 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3740 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3741 |
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3742 template <class T> void do_oop_work(T* p) { |
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3743 T heap_oop = oopDesc::load_heap_oop(p); |
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3744 if (oopDesc::is_null(heap_oop)) return; |
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3745 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
342 | 3746 if (obj->is_forwarded()) { |
3747 // If the object has already been forwarded, we have to make sure | |
3748 // that it's marked. So follow the forwarding pointer. Note that | |
3749 // this does the right thing for self-forwarding pointers in the | |
3750 // evacuation failure case. | |
3751 obj = obj->forwardee(); | |
3752 } | |
3753 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
3754 if (hr != NULL) { | |
3755 if (hr->in_collection_set()) { | |
3756 if (_g1h->is_obj_ill(obj)) { | |
4097
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|
3757 if (_bm->parMark((HeapWord*)obj)) { |
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|
3758 if (!push(obj)) { |
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|
3759 gclog_or_tty->print_cr("Setting abort in CSetMarkOopClosure because push failed."); |
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|
3760 set_abort(); |
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|
3761 } |
342 | 3762 } |
3763 } | |
3764 } else { | |
3765 // Outside the collection set; we need to gray it | |
3766 _cm->deal_with_reference(obj); | |
3767 } | |
3768 } | |
3769 } | |
3770 }; | |
3771 | |
4097
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|
3772 class CSetMarkBitMapClosure: public BitMapClosure { |
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|
3773 G1CollectedHeap* _g1h; |
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|
3774 CMBitMap* _bitMap; |
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|
3775 ConcurrentMark* _cm; |
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|
3776 CSetMarkOopClosure _oop_cl; |
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|
3777 uint _worker_id; |
4097
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|
3778 |
342 | 3779 public: |
4728
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|
3780 CSetMarkBitMapClosure(ConcurrentMark* cm, int ms_size, int worker_id) : |
342 | 3781 _g1h(G1CollectedHeap::heap()), |
3782 _bitMap(cm->nextMarkBitMap()), | |
4728
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|
3783 _oop_cl(cm, ms_size, worker_id), |
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|
3784 _worker_id(worker_id) { } |
342 | 3785 |
3786 bool do_bit(size_t offset) { | |
3787 // convert offset into a HeapWord* | |
3788 HeapWord* addr = _bitMap->offsetToHeapWord(offset); | |
3789 assert(_bitMap->endWord() && addr < _bitMap->endWord(), | |
3790 "address out of range"); | |
3791 assert(_bitMap->isMarked(addr), "tautology"); | |
3792 oop obj = oop(addr); | |
3793 if (!obj->is_forwarded()) { | |
3794 if (!_oop_cl.push(obj)) return false; | |
845
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|
3795 if (UseCompressedOops) { |
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|
3796 if (!_oop_cl.drain<narrowOop>()) return false; |
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|
3797 } else { |
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|
3798 if (!_oop_cl.drain<oop>()) return false; |
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|
3799 } |
342 | 3800 } |
3801 // Otherwise... | |
3802 return true; | |
3803 } | |
3804 }; | |
3805 | |
4097
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|
3806 class CompleteMarkingInCSetHRClosure: public HeapRegionClosure { |
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|
3807 CMBitMap* _bm; |
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|
3808 CSetMarkBitMapClosure _bit_cl; |
4728
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|
3809 uint _worker_id; |
4097
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|
3810 |
342 | 3811 enum SomePrivateConstants { |
3812 MSSize = 1000 | |
3813 }; | |
4097
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3814 |
342 | 3815 public: |
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|
3816 CompleteMarkingInCSetHRClosure(ConcurrentMark* cm, int worker_id) : |
342 | 3817 _bm(cm->nextMarkBitMap()), |
4728
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|
3818 _bit_cl(cm, MSSize, worker_id), |
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|
3819 _worker_id(worker_id) { } |
4097
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|
3820 |
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|
3821 bool doHeapRegion(HeapRegion* hr) { |
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|
3822 if (hr->claimHeapRegion(HeapRegion::CompleteMarkCSetClaimValue)) { |
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3823 // The current worker has successfully claimed the region. |
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|
3824 if (!hr->evacuation_failed()) { |
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|
3825 MemRegion mr = MemRegion(hr->bottom(), hr->next_top_at_mark_start()); |
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|
3826 if (!mr.is_empty()) { |
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|
3827 bool done = false; |
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|
3828 while (!done) { |
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|
3829 done = _bm->iterate(&_bit_cl, mr); |
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3830 } |
342 | 3831 } |
3832 } | |
3833 } | |
3834 return false; | |
3835 } | |
3836 }; | |
3837 | |
4097
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|
3838 class G1ParCompleteMarkInCSetTask: public AbstractGangTask { |
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|
3839 protected: |
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|
3840 G1CollectedHeap* _g1h; |
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|
3841 ConcurrentMark* _cm; |
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|
3842 |
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|
3843 public: |
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|
3844 G1ParCompleteMarkInCSetTask(G1CollectedHeap* g1h, |
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|
3845 ConcurrentMark* cm) : |
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|
3846 AbstractGangTask("Complete Mark in CSet"), |
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|
3847 _g1h(g1h), _cm(cm) { } |
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3848 |
4728
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|
3849 void work(uint worker_id) { |
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|
3850 CompleteMarkingInCSetHRClosure cmplt(_cm, worker_id); |
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|
3851 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id); |
4097
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|
3852 _g1h->collection_set_iterate_from(hr, &cmplt); |
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|
3853 } |
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|
3854 }; |
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|
3855 |
342 | 3856 void ConcurrentMark::complete_marking_in_collection_set() { |
4787
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|
3857 guarantee(false, "complete_marking_in_collection_set(): " |
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|
3858 "don't call this any more"); |
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|
3859 |
342 | 3860 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
3861 | |
3862 if (!g1h->mark_in_progress()) { | |
3863 g1h->g1_policy()->record_mark_closure_time(0.0); | |
3864 return; | |
3865 } | |
3866 | |
3867 double start = os::elapsedTime(); | |
4097
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|
3868 G1ParCompleteMarkInCSetTask complete_mark_task(g1h, this); |
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
3869 |
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|
3870 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
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|
3871 |
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|
3872 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4711 | 3873 int n_workers = g1h->workers()->active_workers(); |
4097
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|
3874 g1h->set_par_threads(n_workers); |
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|
3875 g1h->workers()->run_task(&complete_mark_task); |
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|
3876 g1h->set_par_threads(0); |
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|
3877 } else { |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
3878 complete_mark_task.work(0); |
342 | 3879 } |
4093
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|
3880 |
4097
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|
3881 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::CompleteMarkCSetClaimValue), "sanity"); |
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|
3882 |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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4735
diff
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|
3883 // Reset the claim values in the regions in the collection set. |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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|
3884 g1h->reset_cset_heap_region_claim_values(); |
4097
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|
3885 |
dc467e8b2c5e
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|
3886 assert(g1h->check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
4093
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|
3887 |
342 | 3888 double end_time = os::elapsedTime(); |
3889 double elapsed_time_ms = (end_time - start) * 1000.0; | |
3890 g1h->g1_policy()->record_mark_closure_time(elapsed_time_ms); | |
3891 } | |
3892 | |
3893 // The next two methods deal with the following optimisation. Some | |
3894 // objects are gray by being marked and located above the finger. If | |
3895 // they are copied, during an evacuation pause, below the finger then | |
3896 // the need to be pushed on the stack. The observation is that, if | |
3897 // there are no regions in the collection set located above the | |
3898 // finger, then the above cannot happen, hence we do not need to | |
3899 // explicitly gray any objects when copying them to below the | |
3900 // finger. The global stack will be scanned to ensure that, if it | |
3901 // points to objects being copied, it will update their | |
3902 // location. There is a tricky situation with the gray objects in | |
3903 // region stack that are being coped, however. See the comment in | |
3904 // newCSet(). | |
3905 | |
3906 void ConcurrentMark::newCSet() { | |
4787
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|
3907 guarantee(false, "newCSet(): don't call this any more"); |
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|
3908 |
3776
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|
3909 if (!concurrent_marking_in_progress()) { |
342 | 3910 // nothing to do if marking is not in progress |
3911 return; | |
3776
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|
3912 } |
342 | 3913 |
3914 // find what the lowest finger is among the global and local fingers | |
3915 _min_finger = _finger; | |
3916 for (int i = 0; i < (int)_max_task_num; ++i) { | |
3917 CMTask* task = _tasks[i]; | |
3918 HeapWord* task_finger = task->finger(); | |
3776
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3919 if (task_finger != NULL && task_finger < _min_finger) { |
342 | 3920 _min_finger = task_finger; |
3776
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3921 } |
342 | 3922 } |
3923 | |
3924 _should_gray_objects = false; | |
3925 | |
3926 // This fixes a very subtle and fustrating bug. It might be the case | |
3927 // that, during en evacuation pause, heap regions that contain | |
3928 // objects that are gray (by being in regions contained in the | |
3929 // region stack) are included in the collection set. Since such gray | |
3930 // objects will be moved, and because it's not easy to redirect | |
3931 // region stack entries to point to a new location (because objects | |
3932 // in one region might be scattered to multiple regions after they | |
3933 // are copied), one option is to ensure that all marked objects | |
3934 // copied during a pause are pushed on the stack. Notice, however, | |
3935 // that this problem can only happen when the region stack is not | |
3936 // empty during an evacuation pause. So, we make the fix a bit less | |
3937 // conservative and ensure that regions are pushed on the stack, | |
3938 // irrespective whether all collection set regions are below the | |
3939 // finger, if the region stack is not empty. This is expected to be | |
3940 // a rare case, so I don't think it's necessary to be smarted about it. | |
3776
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3941 if (!region_stack_empty() || has_aborted_regions()) { |
342 | 3942 _should_gray_objects = true; |
3776
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3943 } |
342 | 3944 } |
3945 | |
3946 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
4787
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|
3947 guarantee(false, "registerCSetRegion(): don't call this any more"); |
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3948 |
3776
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|
3949 if (!concurrent_marking_in_progress()) return; |
342 | 3950 |
3951 HeapWord* region_end = hr->end(); | |
3776
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3952 if (region_end > _min_finger) { |
342 | 3953 _should_gray_objects = true; |
3776
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3954 } |
342 | 3955 } |
3956 | |
3378
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|
3957 // Resets the region fields of active CMTasks whose values point |
69293e516993
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|
3958 // into the collection set. |
69293e516993
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|
3959 void ConcurrentMark::reset_active_task_region_fields_in_cset() { |
4787
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|
3960 guarantee(false, "reset_active_task_region_fields_in_cset(): " |
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|
3961 "don't call this any more"); |
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|
3962 |
3378
69293e516993
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|
3963 assert(SafepointSynchronize::is_at_safepoint(), "should be in STW"); |
69293e516993
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|
3964 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
69293e516993
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|
3965 |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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diff
changeset
|
3966 for (int i = 0; i < (int)parallel_marking_threads(); i += 1) { |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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|
3967 CMTask* task = _tasks[i]; |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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|
3968 HeapWord* task_finger = task->finger(); |
69293e516993
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|
3969 if (task_finger != NULL) { |
69293e516993
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changeset
|
3970 assert(_g1h->is_in_g1_reserved(task_finger), "not in heap"); |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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|
3971 HeapRegion* finger_region = _g1h->heap_region_containing(task_finger); |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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|
3972 if (finger_region->in_collection_set()) { |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
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diff
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|
3973 // The task's current region is in the collection set. |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
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diff
changeset
|
3974 // This region will be evacuated in the current GC and |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
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diff
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|
3975 // the region fields in the task will be stale. |
69293e516993
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changeset
|
3976 task->giveup_current_region(); |
69293e516993
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diff
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|
3977 } |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3978 } |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3317
diff
changeset
|
3979 } |
69293e516993
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parents:
3317
diff
changeset
|
3980 } |
69293e516993
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diff
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|
3981 |
342 | 3982 // abandon current marking iteration due to a Full GC |
3983 void ConcurrentMark::abort() { | |
3984 // Clear all marks to force marking thread to do nothing | |
3985 _nextMarkBitMap->clearAll(); | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
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|
3986 // Clear the liveness counting data |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3987 clear_all_count_data(); |
342 | 3988 // Empty mark stack |
3989 clear_marking_state(); | |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
3990 for (int i = 0; i < (int)_max_task_num; ++i) { |
342 | 3991 _tasks[i]->clear_region_fields(); |
1835
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|
3992 } |
342 | 3993 _has_aborted = true; |
3994 | |
3995 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3996 satb_mq_set.abandon_partial_marking(); | |
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
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1314
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|
3997 // This can be called either during or outside marking, we'll read |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
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1314
diff
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|
3998 // the expected_active value from the SATB queue set. |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
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1314
diff
changeset
|
3999 satb_mq_set.set_active_all_threads( |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
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1314
diff
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|
4000 false, /* new active value */ |
d4197f8d516a
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|
4001 satb_mq_set.is_active() /* expected_active */); |
342 | 4002 } |
4003 | |
4004 static void print_ms_time_info(const char* prefix, const char* name, | |
4005 NumberSeq& ns) { | |
4006 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
4007 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
4008 if (ns.num() > 0) { | |
4009 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
4010 prefix, ns.sd(), ns.maximum()); | |
4011 } | |
4012 } | |
4013 | |
4014 void ConcurrentMark::print_summary_info() { | |
4015 gclog_or_tty->print_cr(" Concurrent marking:"); | |
4016 print_ms_time_info(" ", "init marks", _init_times); | |
4017 print_ms_time_info(" ", "remarks", _remark_times); | |
4018 { | |
4019 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
4020 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
4021 | |
4022 } | |
4023 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
4024 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
4025 _total_counting_time, | |
4026 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
4027 (double)_cleanup_times.num() | |
4028 : 0.0)); | |
4029 if (G1ScrubRemSets) { | |
4030 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
4031 _total_rs_scrub_time, | |
4032 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
4033 (double)_cleanup_times.num() | |
4034 : 0.0)); | |
4035 } | |
4036 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
4037 (_init_times.sum() + _remark_times.sum() + | |
4038 _cleanup_times.sum())/1000.0); | |
4039 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
4836
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|
4040 "(%8.2f s marking).", |
342 | 4041 cmThread()->vtime_accum(), |
4836
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|
4042 cmThread()->vtime_mark_accum()); |
342 | 4043 } |
4044 | |
1019 | 4045 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
4046 _parallel_workers->print_worker_threads_on(st); | |
4047 } | |
4048 | |
342 | 4049 // We take a break if someone is trying to stop the world. |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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4711
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|
4050 bool ConcurrentMark::do_yield_check(uint worker_id) { |
342 | 4051 if (should_yield()) { |
4728
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|
4052 if (worker_id == 0) { |
342 | 4053 _g1h->g1_policy()->record_concurrent_pause(); |
3776
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|
4054 } |
342 | 4055 cmThread()->yield(); |
4728
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|
4056 if (worker_id == 0) { |
342 | 4057 _g1h->g1_policy()->record_concurrent_pause_end(); |
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|
4058 } |
342 | 4059 return true; |
4060 } else { | |
4061 return false; | |
4062 } | |
4063 } | |
4064 | |
4065 bool ConcurrentMark::should_yield() { | |
4066 return cmThread()->should_yield(); | |
4067 } | |
4068 | |
4069 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
4070 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
4071 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
4072 } | |
4073 | |
4074 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
4075 void* last) { | |
3776
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|
4076 return containing_card_is_marked(start) && |
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|
4077 containing_card_is_marked(last); |
342 | 4078 } |
4079 | |
4080 #ifndef PRODUCT | |
4081 // for debugging purposes | |
4082 void ConcurrentMark::print_finger() { | |
4083 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
4084 _heap_start, _heap_end, _finger); | |
4085 for (int i = 0; i < (int) _max_task_num; ++i) { | |
4086 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
4087 } | |
4088 gclog_or_tty->print_cr(""); | |
4089 } | |
4090 #endif | |
4091 | |
3771 | 4092 void CMTask::scan_object(oop obj) { |
4093 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
4094 | |
4095 if (_cm->verbose_high()) { | |
4096 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
4097 _task_id, (void*) obj); | |
4098 } | |
4099 | |
4100 size_t obj_size = obj->size(); | |
4101 _words_scanned += obj_size; | |
4102 | |
4103 obj->oop_iterate(_cm_oop_closure); | |
4104 statsOnly( ++_objs_scanned ); | |
4105 check_limits(); | |
4106 } | |
4107 | |
342 | 4108 // Closure for iteration over bitmaps |
4109 class CMBitMapClosure : public BitMapClosure { | |
4110 private: | |
4111 // the bitmap that is being iterated over | |
4112 CMBitMap* _nextMarkBitMap; | |
4113 ConcurrentMark* _cm; | |
4114 CMTask* _task; | |
4115 // true if we're scanning a heap region claimed by the task (so that | |
4116 // we move the finger along), false if we're not, i.e. currently when | |
4117 // scanning a heap region popped from the region stack (so that we | |
4118 // do not move the task finger along; it'd be a mistake if we did so). | |
4119 bool _scanning_heap_region; | |
4120 | |
4121 public: | |
4122 CMBitMapClosure(CMTask *task, | |
4123 ConcurrentMark* cm, | |
4124 CMBitMap* nextMarkBitMap) | |
4125 : _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } | |
4126 | |
4127 void set_scanning_heap_region(bool scanning_heap_region) { | |
4128 _scanning_heap_region = scanning_heap_region; | |
4129 } | |
4130 | |
4131 bool do_bit(size_t offset) { | |
4132 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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4133 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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4134 assert( addr < _cm->finger(), "invariant"); |
342 | 4135 |
4136 if (_scanning_heap_region) { | |
4137 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
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4138 assert(addr >= _task->finger(), "invariant"); |
342 | 4139 // We move that task's local finger along. |
4140 _task->move_finger_to(addr); | |
4141 } else { | |
4142 // We move the task's region finger along. | |
4143 _task->move_region_finger_to(addr); | |
4144 } | |
4145 | |
4146 _task->scan_object(oop(addr)); | |
4147 // we only partially drain the local queue and global stack | |
4148 _task->drain_local_queue(true); | |
4149 _task->drain_global_stack(true); | |
4150 | |
4151 // if the has_aborted flag has been raised, we need to bail out of | |
4152 // the iteration | |
4153 return !_task->has_aborted(); | |
4154 } | |
4155 }; | |
4156 | |
4157 // Closure for iterating over objects, currently only used for | |
4158 // processing SATB buffers. | |
4159 class CMObjectClosure : public ObjectClosure { | |
4160 private: | |
4161 CMTask* _task; | |
4162 | |
4163 public: | |
4164 void do_object(oop obj) { | |
4165 _task->deal_with_reference(obj); | |
4166 } | |
4167 | |
4168 CMObjectClosure(CMTask* task) : _task(task) { } | |
4169 }; | |
4170 | |
3771 | 4171 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
4172 ConcurrentMark* cm, | |
4173 CMTask* task) | |
4174 : _g1h(g1h), _cm(cm), _task(task) { | |
4175 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
4176 | |
4177 if (G1UseConcMarkReferenceProcessing) { | |
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4178 _ref_processor = g1h->ref_processor_cm(); |
3771 | 4179 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 4180 } |
3771 | 4181 } |
342 | 4182 |
4183 void CMTask::setup_for_region(HeapRegion* hr) { | |
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4184 // Separated the asserts so that we know which one fires. |
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4185 assert(hr != NULL, |
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4186 "claim_region() should have filtered out continues humongous regions"); |
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4187 assert(!hr->continuesHumongous(), |
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4188 "claim_region() should have filtered out continues humongous regions"); |
342 | 4189 |
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4190 if (_cm->verbose_low()) { |
342 | 4191 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
4192 _task_id, hr); | |
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4193 } |
342 | 4194 |
4195 _curr_region = hr; | |
4196 _finger = hr->bottom(); | |
4197 update_region_limit(); | |
4198 } | |
4199 | |
4200 void CMTask::update_region_limit() { | |
4201 HeapRegion* hr = _curr_region; | |
4202 HeapWord* bottom = hr->bottom(); | |
4203 HeapWord* limit = hr->next_top_at_mark_start(); | |
4204 | |
4205 if (limit == bottom) { | |
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4206 if (_cm->verbose_low()) { |
342 | 4207 gclog_or_tty->print_cr("[%d] found an empty region " |
4208 "["PTR_FORMAT", "PTR_FORMAT")", | |
4209 _task_id, bottom, limit); | |
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4210 } |
342 | 4211 // The region was collected underneath our feet. |
4212 // We set the finger to bottom to ensure that the bitmap | |
4213 // iteration that will follow this will not do anything. | |
4214 // (this is not a condition that holds when we set the region up, | |
4215 // as the region is not supposed to be empty in the first place) | |
4216 _finger = bottom; | |
4217 } else if (limit >= _region_limit) { | |
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4218 assert(limit >= _finger, "peace of mind"); |
342 | 4219 } else { |
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4220 assert(limit < _region_limit, "only way to get here"); |
342 | 4221 // This can happen under some pretty unusual circumstances. An |
4222 // evacuation pause empties the region underneath our feet (NTAMS | |
4223 // at bottom). We then do some allocation in the region (NTAMS | |
4224 // stays at bottom), followed by the region being used as a GC | |
4225 // alloc region (NTAMS will move to top() and the objects | |
4226 // originally below it will be grayed). All objects now marked in | |
4227 // the region are explicitly grayed, if below the global finger, | |
4228 // and we do not need in fact to scan anything else. So, we simply | |
4229 // set _finger to be limit to ensure that the bitmap iteration | |
4230 // doesn't do anything. | |
4231 _finger = limit; | |
4232 } | |
4233 | |
4234 _region_limit = limit; | |
4235 } | |
4236 | |
4237 void CMTask::giveup_current_region() { | |
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4238 assert(_curr_region != NULL, "invariant"); |
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4239 if (_cm->verbose_low()) { |
342 | 4240 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
4241 _task_id, _curr_region); | |
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4242 } |
342 | 4243 clear_region_fields(); |
4244 } | |
4245 | |
4246 void CMTask::clear_region_fields() { | |
4247 // Values for these three fields that indicate that we're not | |
4248 // holding on to a region. | |
4249 _curr_region = NULL; | |
4250 _finger = NULL; | |
4251 _region_limit = NULL; | |
4252 | |
4253 _region_finger = NULL; | |
4254 } | |
4255 | |
3771 | 4256 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
4257 if (cm_oop_closure == NULL) { | |
4258 assert(_cm_oop_closure != NULL, "invariant"); | |
4259 } else { | |
4260 assert(_cm_oop_closure == NULL, "invariant"); | |
4261 } | |
4262 _cm_oop_closure = cm_oop_closure; | |
4263 } | |
4264 | |
342 | 4265 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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4266 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 4267 |
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4268 if (_cm->verbose_low()) { |
342 | 4269 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
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4270 } |
342 | 4271 |
4272 _nextMarkBitMap = nextMarkBitMap; | |
4273 clear_region_fields(); | |
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4274 assert(_aborted_region.is_empty(), "should have been cleared"); |
342 | 4275 |
4276 _calls = 0; | |
4277 _elapsed_time_ms = 0.0; | |
4278 _termination_time_ms = 0.0; | |
4279 _termination_start_time_ms = 0.0; | |
4280 | |
4281 #if _MARKING_STATS_ | |
4282 _local_pushes = 0; | |
4283 _local_pops = 0; | |
4284 _local_max_size = 0; | |
4285 _objs_scanned = 0; | |
4286 _global_pushes = 0; | |
4287 _global_pops = 0; | |
4288 _global_max_size = 0; | |
4289 _global_transfers_to = 0; | |
4290 _global_transfers_from = 0; | |
4291 _region_stack_pops = 0; | |
4292 _regions_claimed = 0; | |
4293 _objs_found_on_bitmap = 0; | |
4294 _satb_buffers_processed = 0; | |
4295 _steal_attempts = 0; | |
4296 _steals = 0; | |
4297 _aborted = 0; | |
4298 _aborted_overflow = 0; | |
4299 _aborted_cm_aborted = 0; | |
4300 _aborted_yield = 0; | |
4301 _aborted_timed_out = 0; | |
4302 _aborted_satb = 0; | |
4303 _aborted_termination = 0; | |
4304 #endif // _MARKING_STATS_ | |
4305 } | |
4306 | |
4307 bool CMTask::should_exit_termination() { | |
4308 regular_clock_call(); | |
4309 // This is called when we are in the termination protocol. We should | |
4310 // quit if, for some reason, this task wants to abort or the global | |
4311 // stack is not empty (this means that we can get work from it). | |
4312 return !_cm->mark_stack_empty() || has_aborted(); | |
4313 } | |
4314 | |
4315 void CMTask::reached_limit() { | |
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4316 assert(_words_scanned >= _words_scanned_limit || |
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4317 _refs_reached >= _refs_reached_limit , |
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4318 "shouldn't have been called otherwise"); |
342 | 4319 regular_clock_call(); |
4320 } | |
4321 | |
4322 void CMTask::regular_clock_call() { | |
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4323 if (has_aborted()) return; |
342 | 4324 |
4325 // First, we need to recalculate the words scanned and refs reached | |
4326 // limits for the next clock call. | |
4327 recalculate_limits(); | |
4328 | |
4329 // During the regular clock call we do the following | |
4330 | |
4331 // (1) If an overflow has been flagged, then we abort. | |
4332 if (_cm->has_overflown()) { | |
4333 set_has_aborted(); | |
4334 return; | |
4335 } | |
4336 | |
4337 // If we are not concurrent (i.e. we're doing remark) we don't need | |
4338 // to check anything else. The other steps are only needed during | |
4339 // the concurrent marking phase. | |
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4340 if (!concurrent()) return; |
342 | 4341 |
4342 // (2) If marking has been aborted for Full GC, then we also abort. | |
4343 if (_cm->has_aborted()) { | |
4344 set_has_aborted(); | |
4345 statsOnly( ++_aborted_cm_aborted ); | |
4346 return; | |
4347 } | |
4348 | |
4349 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
4350 | |
4351 // (3) If marking stats are enabled, then we update the step history. | |
4352 #if _MARKING_STATS_ | |
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4353 if (_words_scanned >= _words_scanned_limit) { |
342 | 4354 ++_clock_due_to_scanning; |
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4355 } |
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4356 if (_refs_reached >= _refs_reached_limit) { |
342 | 4357 ++_clock_due_to_marking; |
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4358 } |
342 | 4359 |
4360 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
4361 _interval_start_time_ms = curr_time_ms; | |
4362 _all_clock_intervals_ms.add(last_interval_ms); | |
4363 | |
4364 if (_cm->verbose_medium()) { | |
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4365 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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4366 "scanned = %d%s, refs reached = %d%s", |
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4367 _task_id, last_interval_ms, |
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4368 _words_scanned, |
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4369 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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4370 _refs_reached, |
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4371 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 4372 } |
4373 #endif // _MARKING_STATS_ | |
4374 | |
4375 // (4) We check whether we should yield. If we have to, then we abort. | |
4376 if (_cm->should_yield()) { | |
4377 // We should yield. To do this we abort the task. The caller is | |
4378 // responsible for yielding. | |
4379 set_has_aborted(); | |
4380 statsOnly( ++_aborted_yield ); | |
4381 return; | |
4382 } | |
4383 | |
4384 // (5) We check whether we've reached our time quota. If we have, | |
4385 // then we abort. | |
4386 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
4387 if (elapsed_time_ms > _time_target_ms) { | |
4388 set_has_aborted(); | |
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4389 _has_timed_out = true; |
342 | 4390 statsOnly( ++_aborted_timed_out ); |
4391 return; | |
4392 } | |
4393 | |
4394 // (6) Finally, we check whether there are enough completed STAB | |
4395 // buffers available for processing. If there are, we abort. | |
4396 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
4397 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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4398 if (_cm->verbose_low()) { |
342 | 4399 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
4400 _task_id); | |
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4401 } |
342 | 4402 // we do need to process SATB buffers, we'll abort and restart |
4403 // the marking task to do so | |
4404 set_has_aborted(); | |
4405 statsOnly( ++_aborted_satb ); | |
4406 return; | |
4407 } | |
4408 } | |
4409 | |
4410 void CMTask::recalculate_limits() { | |
4411 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
4412 _words_scanned_limit = _real_words_scanned_limit; | |
4413 | |
4414 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
4415 _refs_reached_limit = _real_refs_reached_limit; | |
4416 } | |
4417 | |
4418 void CMTask::decrease_limits() { | |
4419 // This is called when we believe that we're going to do an infrequent | |
4420 // operation which will increase the per byte scanned cost (i.e. move | |
4421 // entries to/from the global stack). It basically tries to decrease the | |
4422 // scanning limit so that the clock is called earlier. | |
4423 | |
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4424 if (_cm->verbose_medium()) { |
342 | 4425 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
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4426 } |
342 | 4427 |
4428 _words_scanned_limit = _real_words_scanned_limit - | |
4429 3 * words_scanned_period / 4; | |
4430 _refs_reached_limit = _real_refs_reached_limit - | |
4431 3 * refs_reached_period / 4; | |
4432 } | |
4433 | |
4434 void CMTask::move_entries_to_global_stack() { | |
4435 // local array where we'll store the entries that will be popped | |
4436 // from the local queue | |
4437 oop buffer[global_stack_transfer_size]; | |
4438 | |
4439 int n = 0; | |
4440 oop obj; | |
4441 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
4442 buffer[n] = obj; | |
4443 ++n; | |
4444 } | |
4445 | |
4446 if (n > 0) { | |
4447 // we popped at least one entry from the local queue | |
4448 | |
4449 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
4450 | |
4451 if (!_cm->mark_stack_push(buffer, n)) { | |
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4452 if (_cm->verbose_low()) { |
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4453 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
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4454 _task_id); |
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4455 } |
342 | 4456 set_has_aborted(); |
4457 } else { | |
4458 // the transfer was successful | |
4459 | |
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4460 if (_cm->verbose_medium()) { |
342 | 4461 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
4462 _task_id, n); | |
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4463 } |
342 | 4464 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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4465 if (tmp_size > _global_max_size) { |
342 | 4466 _global_max_size = tmp_size; |
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4467 } |
342 | 4468 _global_pushes += n ); |
4469 } | |
4470 } | |
4471 | |
4472 // this operation was quite expensive, so decrease the limits | |
4473 decrease_limits(); | |
4474 } | |
4475 | |
4476 void CMTask::get_entries_from_global_stack() { | |
4477 // local array where we'll store the entries that will be popped | |
4478 // from the global stack. | |
4479 oop buffer[global_stack_transfer_size]; | |
4480 int n; | |
4481 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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|
4482 assert(n <= global_stack_transfer_size, |
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4483 "we should not pop more than the given limit"); |
342 | 4484 if (n > 0) { |
4485 // yes, we did actually pop at least one entry | |
4486 | |
4487 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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4488 if (_cm->verbose_medium()) { |
342 | 4489 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
4490 _task_id, n); | |
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4491 } |
342 | 4492 for (int i = 0; i < n; ++i) { |
4493 bool success = _task_queue->push(buffer[i]); | |
4494 // We only call this when the local queue is empty or under a | |
4495 // given target limit. So, we do not expect this push to fail. | |
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4496 assert(success, "invariant"); |
342 | 4497 } |
4498 | |
4499 statsOnly( int tmp_size = _task_queue->size(); | |
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4500 if (tmp_size > _local_max_size) { |
342 | 4501 _local_max_size = tmp_size; |
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4502 } |
342 | 4503 _local_pushes += n ); |
4504 } | |
4505 | |
4506 // this operation was quite expensive, so decrease the limits | |
4507 decrease_limits(); | |
4508 } | |
4509 | |
4510 void CMTask::drain_local_queue(bool partially) { | |
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4511 if (has_aborted()) return; |
342 | 4512 |
4513 // Decide what the target size is, depending whether we're going to | |
4514 // drain it partially (so that other tasks can steal if they run out | |
4515 // of things to do) or totally (at the very end). | |
4516 size_t target_size; | |
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4517 if (partially) { |
342 | 4518 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
3776
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4519 } else { |
342 | 4520 target_size = 0; |
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4521 } |
342 | 4522 |
4523 if (_task_queue->size() > target_size) { | |
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4524 if (_cm->verbose_high()) { |
342 | 4525 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
4526 _task_id, target_size); | |
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4527 } |
342 | 4528 |
4529 oop obj; | |
4530 bool ret = _task_queue->pop_local(obj); | |
4531 while (ret) { | |
4532 statsOnly( ++_local_pops ); | |
4533 | |
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4534 if (_cm->verbose_high()) { |
342 | 4535 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
4536 (void*) obj); | |
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4537 } |
342 | 4538 |
1023
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4539 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 4540 assert(!_g1h->is_on_master_free_list( |
2152 | 4541 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 4542 |
4543 scan_object(obj); | |
4544 | |
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4545 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 4546 ret = false; |
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4547 } else { |
342 | 4548 ret = _task_queue->pop_local(obj); |
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4549 } |
342 | 4550 } |
4551 | |
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4552 if (_cm->verbose_high()) { |
342 | 4553 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
4554 _task_id, _task_queue->size()); | |
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4555 } |
342 | 4556 } |
4557 } | |
4558 | |
4559 void CMTask::drain_global_stack(bool partially) { | |
3776
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|
4560 if (has_aborted()) return; |
342 | 4561 |
4562 // We have a policy to drain the local queue before we attempt to | |
4563 // drain the global stack. | |
1023
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4564 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 4565 |
4566 // Decide what the target size is, depending whether we're going to | |
4567 // drain it partially (so that other tasks can steal if they run out | |
4568 // of things to do) or totally (at the very end). Notice that, | |
4569 // because we move entries from the global stack in chunks or | |
4570 // because another task might be doing the same, we might in fact | |
4571 // drop below the target. But, this is not a problem. | |
4572 size_t target_size; | |
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|
4573 if (partially) { |
342 | 4574 target_size = _cm->partial_mark_stack_size_target(); |
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|
4575 } else { |
342 | 4576 target_size = 0; |
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|
4577 } |
342 | 4578 |
4579 if (_cm->mark_stack_size() > target_size) { | |
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|
4580 if (_cm->verbose_low()) { |
342 | 4581 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
4582 _task_id, target_size); | |
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|
4583 } |
342 | 4584 |
4585 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
4586 get_entries_from_global_stack(); | |
4587 drain_local_queue(partially); | |
4588 } | |
4589 | |
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|
4590 if (_cm->verbose_low()) { |
342 | 4591 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
4592 _task_id, _cm->mark_stack_size()); | |
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|
4593 } |
342 | 4594 } |
4595 } | |
4596 | |
4597 // SATB Queue has several assumptions on whether to call the par or | |
4598 // non-par versions of the methods. this is why some of the code is | |
4599 // replicated. We should really get rid of the single-threaded version | |
4600 // of the code to simplify things. | |
4601 void CMTask::drain_satb_buffers() { | |
3776
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|
4602 if (has_aborted()) return; |
342 | 4603 |
4604 // We set this so that the regular clock knows that we're in the | |
4605 // middle of draining buffers and doesn't set the abort flag when it | |
4606 // notices that SATB buffers are available for draining. It'd be | |
4607 // very counter productive if it did that. :-) | |
4608 _draining_satb_buffers = true; | |
4609 | |
4610 CMObjectClosure oc(this); | |
4611 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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|
4612 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4613 satb_mq_set.set_par_closure(_task_id, &oc); |
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|
4614 } else { |
342 | 4615 satb_mq_set.set_closure(&oc); |
3776
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|
4616 } |
342 | 4617 |
4618 // This keeps claiming and applying the closure to completed buffers | |
4619 // until we run out of buffers or we need to abort. | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1719
diff
changeset
|
4620 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4621 while (!has_aborted() && |
4622 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
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|
4623 if (_cm->verbose_medium()) { |
342 | 4624 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
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|
4625 } |
342 | 4626 statsOnly( ++_satb_buffers_processed ); |
4627 regular_clock_call(); | |
4628 } | |
4629 } else { | |
4630 while (!has_aborted() && | |
4631 satb_mq_set.apply_closure_to_completed_buffer()) { | |
3776
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|
4632 if (_cm->verbose_medium()) { |
342 | 4633 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
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|
4634 } |
342 | 4635 statsOnly( ++_satb_buffers_processed ); |
4636 regular_clock_call(); | |
4637 } | |
4638 } | |
4639 | |
4640 if (!concurrent() && !has_aborted()) { | |
4641 // We should only do this during remark. | |
3776
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|
4642 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4643 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
3776
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|
4644 } else { |
342 | 4645 satb_mq_set.iterate_closure_all_threads(); |
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|
4646 } |
342 | 4647 } |
4648 | |
4649 _draining_satb_buffers = false; | |
4650 | |
1023
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|
4651 assert(has_aborted() || |
11d4857fe5e1
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|
4652 concurrent() || |
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|
4653 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 4654 |
3776
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|
4655 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4656 satb_mq_set.set_par_closure(_task_id, NULL); |
3776
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|
4657 } else { |
342 | 4658 satb_mq_set.set_closure(NULL); |
3776
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|
4659 } |
342 | 4660 |
4661 // again, this was a potentially expensive operation, decrease the | |
4662 // limits to get the regular clock call early | |
4663 decrease_limits(); | |
4664 } | |
4665 | |
4666 void CMTask::drain_region_stack(BitMapClosure* bc) { | |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
4667 assert(_cm->region_stack_empty(), "region stack should be empty"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
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|
4668 assert(_aborted_region.is_empty(), "aborted region should be empty"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
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|
4669 return; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
4670 |
3776
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|
4671 if (has_aborted()) return; |
342 | 4672 |
1023
11d4857fe5e1
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|
4673 assert(_region_finger == NULL, |
11d4857fe5e1
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|
4674 "it should be NULL when we're not scanning a region"); |
342 | 4675 |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
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|
4676 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
3776
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|
4677 if (_cm->verbose_low()) { |
342 | 4678 gclog_or_tty->print_cr("[%d] draining region stack, size = %d", |
4679 _task_id, _cm->region_stack_size()); | |
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|
4680 } |
342 | 4681 |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
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|
4682 MemRegion mr; |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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diff
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|
4683 |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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|
4684 if (!_aborted_region.is_empty()) { |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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|
4685 mr = _aborted_region; |
4805b9f4779e
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diff
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|
4686 _aborted_region = MemRegion(); |
4805b9f4779e
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|
4687 |
3776
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changeset
|
4688 if (_cm->verbose_low()) { |
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|
4689 gclog_or_tty->print_cr("[%d] scanning aborted region " |
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|
4690 "[ " PTR_FORMAT ", " PTR_FORMAT " )", |
23d434c6290d
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|
4691 _task_id, mr.start(), mr.end()); |
23d434c6290d
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|
4692 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
4693 } else { |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
changeset
|
4694 mr = _cm->region_stack_pop_lock_free(); |
4805b9f4779e
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diff
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|
4695 // it returns MemRegion() if the pop fails |
4805b9f4779e
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diff
changeset
|
4696 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
4805b9f4779e
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|
4697 } |
342 | 4698 |
4699 while (mr.start() != NULL) { | |
3776
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|
4700 if (_cm->verbose_medium()) { |
342 | 4701 gclog_or_tty->print_cr("[%d] we are scanning region " |
4702 "["PTR_FORMAT", "PTR_FORMAT")", | |
4703 _task_id, mr.start(), mr.end()); | |
3776
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|
4704 } |
1835
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|
4705 |
1023
11d4857fe5e1
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diff
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|
4706 assert(mr.end() <= _cm->finger(), |
11d4857fe5e1
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1022
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|
4707 "otherwise the region shouldn't be on the stack"); |
342 | 4708 assert(!mr.is_empty(), "Only non-empty regions live on the region stack"); |
4709 if (_nextMarkBitMap->iterate(bc, mr)) { | |
1023
11d4857fe5e1
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1022
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|
4710 assert(!has_aborted(), |
11d4857fe5e1
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diff
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|
4711 "cannot abort the task without aborting the bitmap iteration"); |
342 | 4712 |
4713 // We finished iterating over the region without aborting. | |
4714 regular_clock_call(); | |
3776
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|
4715 if (has_aborted()) { |
342 | 4716 mr = MemRegion(); |
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|
4717 } else { |
1835
4805b9f4779e
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johnc
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1833
diff
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|
4718 mr = _cm->region_stack_pop_lock_free(); |
342 | 4719 // it returns MemRegion() if the pop fails |
4720 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); | |
4721 } | |
4722 } else { | |
1023
11d4857fe5e1
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|
4723 assert(has_aborted(), "currently the only way to do so"); |
342 | 4724 |
4725 // The only way to abort the bitmap iteration is to return | |
4726 // false from the do_bit() method. However, inside the | |
4727 // do_bit() method we move the _region_finger to point to the | |
4728 // object currently being looked at. So, if we bail out, we | |
4729 // have definitely set _region_finger to something non-null. | |
1023
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|
4730 assert(_region_finger != NULL, "invariant"); |
342 | 4731 |
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4732 // Make sure that any previously aborted region has been |
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4733 // cleared. |
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4734 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
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4735 |
342 | 4736 // The iteration was actually aborted. So now _region_finger |
4737 // points to the address of the object we last scanned. If we | |
4738 // leave it there, when we restart this task, we will rescan | |
4739 // the object. It is easy to avoid this. We move the finger by | |
4740 // enough to point to the next possible object header (the | |
4741 // bitmap knows by how much we need to move it as it knows its | |
4742 // granularity). | |
4743 MemRegion newRegion = | |
4744 MemRegion(_nextMarkBitMap->nextWord(_region_finger), mr.end()); | |
4745 | |
4746 if (!newRegion.is_empty()) { | |
4747 if (_cm->verbose_low()) { | |
1835
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4748 gclog_or_tty->print_cr("[%d] recording unscanned region" |
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4749 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
342 | 4750 _task_id, |
4751 newRegion.start(), newRegion.end()); | |
4752 } | |
1835
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4753 // Now record the part of the region we didn't scan to |
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4754 // make sure this task scans it later. |
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4755 _aborted_region = newRegion; |
342 | 4756 } |
4757 // break from while | |
4758 mr = MemRegion(); | |
4759 } | |
4760 _region_finger = NULL; | |
4761 } | |
4762 | |
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4763 if (_cm->verbose_low()) { |
342 | 4764 gclog_or_tty->print_cr("[%d] drained region stack, size = %d", |
4765 _task_id, _cm->region_stack_size()); | |
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4766 } |
342 | 4767 } |
4768 } | |
4769 | |
4770 void CMTask::print_stats() { | |
4771 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
4772 _task_id, _calls); | |
4773 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
4774 _elapsed_time_ms, _termination_time_ms); | |
4775 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4776 _step_times_ms.num(), _step_times_ms.avg(), | |
4777 _step_times_ms.sd()); | |
4778 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4779 _step_times_ms.maximum(), _step_times_ms.sum()); | |
4780 | |
4781 #if _MARKING_STATS_ | |
4782 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4783 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
4784 _all_clock_intervals_ms.sd()); | |
4785 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4786 _all_clock_intervals_ms.maximum(), | |
4787 _all_clock_intervals_ms.sum()); | |
4788 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
4789 _clock_due_to_scanning, _clock_due_to_marking); | |
4790 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
4791 _objs_scanned, _objs_found_on_bitmap); | |
4792 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
4793 _local_pushes, _local_pops, _local_max_size); | |
4794 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
4795 _global_pushes, _global_pops, _global_max_size); | |
4796 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
4797 _global_transfers_to,_global_transfers_from); | |
4798 gclog_or_tty->print_cr(" Regions: claimed = %d, Region Stack: pops = %d", | |
4799 _regions_claimed, _region_stack_pops); | |
4800 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); | |
4801 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
4802 _steal_attempts, _steals); | |
4803 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
4804 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
4805 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
4806 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
4807 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
4808 #endif // _MARKING_STATS_ | |
4809 } | |
4810 | |
4811 /***************************************************************************** | |
4812 | |
4813 The do_marking_step(time_target_ms) method is the building block | |
4814 of the parallel marking framework. It can be called in parallel | |
4815 with other invocations of do_marking_step() on different tasks | |
4816 (but only one per task, obviously) and concurrently with the | |
4817 mutator threads, or during remark, hence it eliminates the need | |
4818 for two versions of the code. When called during remark, it will | |
4819 pick up from where the task left off during the concurrent marking | |
4820 phase. Interestingly, tasks are also claimable during evacuation | |
4821 pauses too, since do_marking_step() ensures that it aborts before | |
4822 it needs to yield. | |
4823 | |
4824 The data structures that is uses to do marking work are the | |
4825 following: | |
4826 | |
4827 (1) Marking Bitmap. If there are gray objects that appear only | |
4828 on the bitmap (this happens either when dealing with an overflow | |
4829 or when the initial marking phase has simply marked the roots | |
4830 and didn't push them on the stack), then tasks claim heap | |
4831 regions whose bitmap they then scan to find gray objects. A | |
4832 global finger indicates where the end of the last claimed region | |
4833 is. A local finger indicates how far into the region a task has | |
4834 scanned. The two fingers are used to determine how to gray an | |
4835 object (i.e. whether simply marking it is OK, as it will be | |
4836 visited by a task in the future, or whether it needs to be also | |
4837 pushed on a stack). | |
4838 | |
4839 (2) Local Queue. The local queue of the task which is accessed | |
4840 reasonably efficiently by the task. Other tasks can steal from | |
4841 it when they run out of work. Throughout the marking phase, a | |
4842 task attempts to keep its local queue short but not totally | |
4843 empty, so that entries are available for stealing by other | |
4844 tasks. Only when there is no more work, a task will totally | |
4845 drain its local queue. | |
4846 | |
4847 (3) Global Mark Stack. This handles local queue overflow. During | |
4848 marking only sets of entries are moved between it and the local | |
4849 queues, as access to it requires a mutex and more fine-grain | |
4850 interaction with it which might cause contention. If it | |
4851 overflows, then the marking phase should restart and iterate | |
4852 over the bitmap to identify gray objects. Throughout the marking | |
4853 phase, tasks attempt to keep the global mark stack at a small | |
4854 length but not totally empty, so that entries are available for | |
4855 popping by other tasks. Only when there is no more work, tasks | |
4856 will totally drain the global mark stack. | |
4857 | |
4858 (4) Global Region Stack. Entries on it correspond to areas of | |
4859 the bitmap that need to be scanned since they contain gray | |
4860 objects. Pushes on the region stack only happen during | |
4861 evacuation pauses and typically correspond to areas covered by | |
4862 GC LABS. If it overflows, then the marking phase should restart | |
4863 and iterate over the bitmap to identify gray objects. Tasks will | |
4864 try to totally drain the region stack as soon as possible. | |
4865 | |
4866 (5) SATB Buffer Queue. This is where completed SATB buffers are | |
4867 made available. Buffers are regularly removed from this queue | |
4868 and scanned for roots, so that the queue doesn't get too | |
4869 long. During remark, all completed buffers are processed, as | |
4870 well as the filled in parts of any uncompleted buffers. | |
4871 | |
4872 The do_marking_step() method tries to abort when the time target | |
4873 has been reached. There are a few other cases when the | |
4874 do_marking_step() method also aborts: | |
4875 | |
4876 (1) When the marking phase has been aborted (after a Full GC). | |
4877 | |
4878 (2) When a global overflow (either on the global stack or the | |
4879 region stack) has been triggered. Before the task aborts, it | |
4880 will actually sync up with the other tasks to ensure that all | |
4881 the marking data structures (local queues, stacks, fingers etc.) | |
4882 are re-initialised so that when do_marking_step() completes, | |
4883 the marking phase can immediately restart. | |
4884 | |
4885 (3) When enough completed SATB buffers are available. The | |
4886 do_marking_step() method only tries to drain SATB buffers right | |
4887 at the beginning. So, if enough buffers are available, the | |
4888 marking step aborts and the SATB buffers are processed at | |
4889 the beginning of the next invocation. | |
4890 | |
4891 (4) To yield. when we have to yield then we abort and yield | |
4892 right at the end of do_marking_step(). This saves us from a lot | |
4893 of hassle as, by yielding we might allow a Full GC. If this | |
4894 happens then objects will be compacted underneath our feet, the | |
4895 heap might shrink, etc. We save checking for this by just | |
4896 aborting and doing the yield right at the end. | |
4897 | |
4898 From the above it follows that the do_marking_step() method should | |
4899 be called in a loop (or, otherwise, regularly) until it completes. | |
4900 | |
4901 If a marking step completes without its has_aborted() flag being | |
4902 true, it means it has completed the current marking phase (and | |
4903 also all other marking tasks have done so and have all synced up). | |
4904 | |
4905 A method called regular_clock_call() is invoked "regularly" (in | |
4906 sub ms intervals) throughout marking. It is this clock method that | |
4907 checks all the abort conditions which were mentioned above and | |
4908 decides when the task should abort. A work-based scheme is used to | |
4909 trigger this clock method: when the number of object words the | |
4910 marking phase has scanned or the number of references the marking | |
4911 phase has visited reach a given limit. Additional invocations to | |
4912 the method clock have been planted in a few other strategic places | |
4913 too. The initial reason for the clock method was to avoid calling | |
4914 vtime too regularly, as it is quite expensive. So, once it was in | |
4915 place, it was natural to piggy-back all the other conditions on it | |
4916 too and not constantly check them throughout the code. | |
4917 | |
4918 *****************************************************************************/ | |
4919 | |
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4920 void CMTask::do_marking_step(double time_target_ms, |
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4921 bool do_stealing, |
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4922 bool do_termination) { |
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4923 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4924 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4925 |
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4926 assert(concurrent() || _cm->region_stack_empty(), |
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4927 "the region stack should have been cleared before remark"); |
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4928 assert(concurrent() || !_cm->has_aborted_regions(), |
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4929 "aborted regions should have been cleared before remark"); |
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4930 assert(_region_finger == NULL, |
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4931 "this should be non-null only when a region is being scanned"); |
342 | 4932 |
4933 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
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4934 assert(_task_queues != NULL, "invariant"); |
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4935 assert(_task_queue != NULL, "invariant"); |
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4936 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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4937 |
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4938 assert(!_claimed, |
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4939 "only one thread should claim this task at any one time"); |
342 | 4940 |
4941 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4942 // possible for two threads to set the _claimed flag at the same | |
4943 // time. But it is only for debugging purposes anyway and it will | |
4944 // catch most problems. | |
4945 _claimed = true; | |
4946 | |
4947 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4948 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4949 | |
4950 double diff_prediction_ms = | |
4951 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4952 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4953 | |
4954 // set up the variables that are used in the work-based scheme to | |
4955 // call the regular clock method | |
4956 _words_scanned = 0; | |
4957 _refs_reached = 0; | |
4958 recalculate_limits(); | |
4959 | |
4960 // clear all flags | |
4961 clear_has_aborted(); | |
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4962 _has_timed_out = false; |
342 | 4963 _draining_satb_buffers = false; |
4964 | |
4965 ++_calls; | |
4966 | |
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4967 if (_cm->verbose_low()) { |
342 | 4968 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
4969 "target = %1.2lfms >>>>>>>>>>", | |
4970 _task_id, _calls, _time_target_ms); | |
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4971 } |
342 | 4972 |
4973 // Set up the bitmap and oop closures. Anything that uses them is | |
4974 // eventually called from this method, so it is OK to allocate these | |
4975 // statically. | |
4976 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4977 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4978 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4979 |
4980 if (_cm->has_overflown()) { | |
4981 // This can happen if the region stack or the mark stack overflows | |
4982 // during a GC pause and this task, after a yield point, | |
4983 // restarts. We have to abort as we need to get into the overflow | |
4984 // protocol which happens right at the end of this task. | |
4985 set_has_aborted(); | |
4986 } | |
4987 | |
4988 // First drain any available SATB buffers. After this, we will not | |
4989 // look at SATB buffers before the next invocation of this method. | |
4990 // If enough completed SATB buffers are queued up, the regular clock | |
4991 // will abort this task so that it restarts. | |
4992 drain_satb_buffers(); | |
4993 // ...then partially drain the local queue and the global stack | |
4994 drain_local_queue(true); | |
4995 drain_global_stack(true); | |
4996 | |
4997 // Then totally drain the region stack. We will not look at | |
4998 // it again before the next invocation of this method. Entries on | |
4999 // the region stack are only added during evacuation pauses, for | |
5000 // which we have to yield. When we do, we abort the task anyway so | |
5001 // it will look at the region stack again when it restarts. | |
5002 bitmap_closure.set_scanning_heap_region(false); | |
5003 drain_region_stack(&bitmap_closure); | |
5004 // ...then partially drain the local queue and the global stack | |
5005 drain_local_queue(true); | |
5006 drain_global_stack(true); | |
5007 | |
5008 do { | |
5009 if (!has_aborted() && _curr_region != NULL) { | |
5010 // This means that we're already holding on to a region. | |
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5011 assert(_finger != NULL, "if region is not NULL, then the finger " |
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5012 "should not be NULL either"); |
342 | 5013 |
5014 // We might have restarted this task after an evacuation pause | |
5015 // which might have evacuated the region we're holding on to | |
5016 // underneath our feet. Let's read its limit again to make sure | |
5017 // that we do not iterate over a region of the heap that | |
5018 // contains garbage (update_region_limit() will also move | |
5019 // _finger to the start of the region if it is found empty). | |
5020 update_region_limit(); | |
5021 // We will start from _finger not from the start of the region, | |
5022 // as we might be restarting this task after aborting half-way | |
5023 // through scanning this region. In this case, _finger points to | |
5024 // the address where we last found a marked object. If this is a | |
5025 // fresh region, _finger points to start(). | |
5026 MemRegion mr = MemRegion(_finger, _region_limit); | |
5027 | |
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5028 if (_cm->verbose_low()) { |
342 | 5029 gclog_or_tty->print_cr("[%d] we're scanning part " |
5030 "["PTR_FORMAT", "PTR_FORMAT") " | |
5031 "of region "PTR_FORMAT, | |
5032 _task_id, _finger, _region_limit, _curr_region); | |
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5033 } |
342 | 5034 |
5035 // Let's iterate over the bitmap of the part of the | |
5036 // region that is left. | |
5037 bitmap_closure.set_scanning_heap_region(true); | |
5038 if (mr.is_empty() || | |
5039 _nextMarkBitMap->iterate(&bitmap_closure, mr)) { | |
5040 // We successfully completed iterating over the region. Now, | |
5041 // let's give up the region. | |
5042 giveup_current_region(); | |
5043 regular_clock_call(); | |
5044 } else { | |
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5045 assert(has_aborted(), "currently the only way to do so"); |
342 | 5046 // The only way to abort the bitmap iteration is to return |
5047 // false from the do_bit() method. However, inside the | |
5048 // do_bit() method we move the _finger to point to the | |
5049 // object currently being looked at. So, if we bail out, we | |
5050 // have definitely set _finger to something non-null. | |
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5051 assert(_finger != NULL, "invariant"); |
342 | 5052 |
5053 // Region iteration was actually aborted. So now _finger | |
5054 // points to the address of the object we last scanned. If we | |
5055 // leave it there, when we restart this task, we will rescan | |
5056 // the object. It is easy to avoid this. We move the finger by | |
5057 // enough to point to the next possible object header (the | |
5058 // bitmap knows by how much we need to move it as it knows its | |
5059 // granularity). | |
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5060 assert(_finger < _region_limit, "invariant"); |
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5061 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
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5062 // Check if bitmap iteration was aborted while scanning the last object |
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5063 if (new_finger >= _region_limit) { |
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5064 giveup_current_region(); |
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5065 } else { |
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6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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1284
diff
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|
5066 move_finger_to(new_finger); |
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
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diff
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|
5067 } |
342 | 5068 } |
5069 } | |
5070 // At this point we have either completed iterating over the | |
5071 // region we were holding on to, or we have aborted. | |
5072 | |
5073 // We then partially drain the local queue and the global stack. | |
5074 // (Do we really need this?) | |
5075 drain_local_queue(true); | |
5076 drain_global_stack(true); | |
5077 | |
5078 // Read the note on the claim_region() method on why it might | |
5079 // return NULL with potentially more regions available for | |
5080 // claiming and why we have to check out_of_regions() to determine | |
5081 // whether we're done or not. | |
5082 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
5083 // We are going to try to claim a new region. We should have | |
5084 // given up on the previous one. | |
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|
5085 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
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|
5086 assert(_curr_region == NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
5087 assert(_finger == NULL, "invariant"); |
11d4857fe5e1
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|
5088 assert(_region_limit == NULL, "invariant"); |
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|
5089 if (_cm->verbose_low()) { |
342 | 5090 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
3776
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|
5091 } |
342 | 5092 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
5093 if (claimed_region != NULL) { | |
5094 // Yes, we managed to claim one | |
5095 statsOnly( ++_regions_claimed ); | |
5096 | |
3776
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|
5097 if (_cm->verbose_low()) { |
342 | 5098 gclog_or_tty->print_cr("[%d] we successfully claimed " |
5099 "region "PTR_FORMAT, | |
5100 _task_id, claimed_region); | |
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|
5101 } |
342 | 5102 |
5103 setup_for_region(claimed_region); | |
1023
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|
5104 assert(_curr_region == claimed_region, "invariant"); |
342 | 5105 } |
5106 // It is important to call the regular clock here. It might take | |
5107 // a while to claim a region if, for example, we hit a large | |
5108 // block of empty regions. So we need to call the regular clock | |
5109 // method once round the loop to make sure it's called | |
5110 // frequently enough. | |
5111 regular_clock_call(); | |
5112 } | |
5113 | |
5114 if (!has_aborted() && _curr_region == NULL) { | |
1023
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|
5115 assert(_cm->out_of_regions(), |
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|
5116 "at this point we should be out of regions"); |
342 | 5117 } |
5118 } while ( _curr_region != NULL && !has_aborted()); | |
5119 | |
5120 if (!has_aborted()) { | |
5121 // 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, ...)
iveresov
parents:
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diff
changeset
|
5122 // 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
|
5123 // 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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|
5124 // it can push a partially done region back. |
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|
5125 assert(_cm->out_of_regions(), |
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|
5126 "at this point we should be out of regions"); |
342 | 5127 |
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|
5128 if (_cm->verbose_low()) { |
342 | 5129 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
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|
5130 } |
342 | 5131 |
5132 // Try to reduce the number of available SATB buffers so that | |
5133 // remark has less work to do. | |
5134 drain_satb_buffers(); | |
5135 } | |
5136 | |
5137 // Since we've done everything else, we can now totally drain the | |
5138 // local queue and global stack. | |
5139 drain_local_queue(false); | |
5140 drain_global_stack(false); | |
5141 | |
5142 // Attempt at work stealing from other task's queues. | |
2174
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|
5143 if (do_stealing && !has_aborted()) { |
342 | 5144 // We have not aborted. This means that we have finished all that |
5145 // we could. Let's try to do some stealing... | |
5146 | |
5147 // 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, ...)
iveresov
parents:
342
diff
changeset
|
5148 // 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
|
5149 // check if the region stack is empty because if a thread is aborting |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
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diff
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|
5150 // it can push a partially done region back. |
1023
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|
5151 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
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|
5152 "only way to reach here"); |
342 | 5153 |
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|
5154 if (_cm->verbose_low()) { |
342 | 5155 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
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|
5156 } |
342 | 5157 |
5158 while (!has_aborted()) { | |
5159 oop obj; | |
5160 statsOnly( ++_steal_attempts ); | |
5161 | |
5162 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
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|
5163 if (_cm->verbose_medium()) { |
342 | 5164 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
5165 _task_id, (void*) obj); | |
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|
5166 } |
342 | 5167 |
5168 statsOnly( ++_steals ); | |
5169 | |
1023
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|
5170 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
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|
5171 "any stolen object should be marked"); |
342 | 5172 scan_object(obj); |
5173 | |
5174 // And since we're towards the end, let's totally drain the | |
5175 // local queue and global stack. | |
5176 drain_local_queue(false); | |
5177 drain_global_stack(false); | |
5178 } else { | |
5179 break; | |
5180 } | |
5181 } | |
5182 } | |
5183 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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diff
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|
5184 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
5185 // 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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|
5186 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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|
5187 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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|
5188 _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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|
5189 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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2436
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|
5190 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
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|
5191 } |
cd8e33b2a8ad
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|
5192 |
342 | 5193 // We still haven't aborted. Now, let's try to get into the |
5194 // termination protocol. | |
2174
234761c55641
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|
5195 if (do_termination && !has_aborted()) { |
342 | 5196 // 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, ...)
iveresov
parents:
342
diff
changeset
|
5197 // 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, ...)
iveresov
parents:
342
diff
changeset
|
5198 // check if the region stack is empty because if a thread is aborting |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
iveresov
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342
diff
changeset
|
5199 // it can push a partially done region back. |
1023
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|
5200 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
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|
5201 assert(_cm->out_of_regions(), "only way to reach here"); |
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|
5202 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 5203 |
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|
5204 if (_cm->verbose_low()) { |
342 | 5205 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
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|
5206 } |
342 | 5207 |
5208 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
5209 // The CMTask class also extends the TerminatorTerminator class, | |
5210 // hence its should_exit_termination() method will also decide | |
5211 // whether to exit the termination protocol or not. | |
5212 bool finished = _cm->terminator()->offer_termination(this); | |
5213 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
5214 _termination_time_ms += | |
5215 termination_end_time_ms - _termination_start_time_ms; | |
5216 | |
5217 if (finished) { | |
5218 // We're all done. | |
5219 | |
5220 if (_task_id == 0) { | |
5221 // let's allow task 0 to do this | |
5222 if (concurrent()) { | |
1023
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|
5223 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 5224 // we need to set this to false before the next |
5225 // safepoint. This way we ensure that the marking phase | |
5226 // doesn't observe any more heap expansions. | |
5227 _cm->clear_concurrent_marking_in_progress(); | |
5228 } | |
5229 } | |
5230 | |
5231 // We can now guarantee that the global stack is empty, since | |
1023
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diff
changeset
|
5232 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
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|
5233 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
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|
5234 // which one. |
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|
5235 guarantee(_cm->out_of_regions(), "only way to reach here"); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
5236 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
1023
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|
5237 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
11d4857fe5e1
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|
5238 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
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|
5239 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
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|
5240 guarantee(!_cm->has_overflown(), "only way to reach here"); |
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|
5241 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
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|
5242 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
342 | 5243 |
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|
5244 if (_cm->verbose_low()) { |
342 | 5245 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
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|
5246 } |
342 | 5247 } else { |
5248 // Apparently there's more work to do. Let's abort this task. It | |
5249 // will restart it and we can hopefully find more things to do. | |
5250 | |
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|
5251 if (_cm->verbose_low()) { |
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|
5252 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
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|
5253 _task_id); |
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|
5254 } |
342 | 5255 |
5256 set_has_aborted(); | |
5257 statsOnly( ++_aborted_termination ); | |
5258 } | |
5259 } | |
5260 | |
5261 // Mainly for debugging purposes to make sure that a pointer to the | |
5262 // closure which was statically allocated in this frame doesn't | |
5263 // escape it by accident. | |
3771 | 5264 set_cm_oop_closure(NULL); |
342 | 5265 double end_time_ms = os::elapsedVTime() * 1000.0; |
5266 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
5267 // Update the step history. | |
5268 _step_times_ms.add(elapsed_time_ms); | |
5269 | |
5270 if (has_aborted()) { | |
5271 // The task was aborted for some reason. | |
5272 | |
5273 statsOnly( ++_aborted ); | |
5274 | |
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|
5275 if (_has_timed_out) { |
342 | 5276 double diff_ms = elapsed_time_ms - _time_target_ms; |
5277 // Keep statistics of how well we did with respect to hitting | |
5278 // our target only if we actually timed out (if we aborted for | |
5279 // other reasons, then the results might get skewed). | |
5280 _marking_step_diffs_ms.add(diff_ms); | |
5281 } | |
5282 | |
5283 if (_cm->has_overflown()) { | |
5284 // This is the interesting one. We aborted because a global | |
5285 // overflow was raised. This means we have to restart the | |
5286 // marking phase and start iterating over regions. However, in | |
5287 // order to do this we have to make sure that all tasks stop | |
5288 // what they are doing and re-initialise in a safe manner. We | |
5289 // will achieve this with the use of two barrier sync points. | |
5290 | |
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|
5291 if (_cm->verbose_low()) { |
342 | 5292 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
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|
5293 } |
342 | 5294 |
5295 _cm->enter_first_sync_barrier(_task_id); | |
5296 // When we exit this sync barrier we know that all tasks have | |
5297 // stopped doing marking work. So, it's now safe to | |
5298 // re-initialise our data structures. At the end of this method, | |
5299 // task 0 will clear the global data structures. | |
5300 | |
5301 statsOnly( ++_aborted_overflow ); | |
5302 | |
5303 // We clear the local state of this task... | |
5304 clear_region_fields(); | |
5305 | |
5306 // ...and enter the second barrier. | |
5307 _cm->enter_second_sync_barrier(_task_id); | |
5308 // At this point everything has bee re-initialised and we're | |
5309 // ready to restart. | |
5310 } | |
5311 | |
5312 if (_cm->verbose_low()) { | |
5313 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
5314 "elapsed = %1.2lfms <<<<<<<<<<", | |
5315 _task_id, _time_target_ms, elapsed_time_ms); | |
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|
5316 if (_cm->has_aborted()) { |
342 | 5317 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
5318 _task_id); | |
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|
5319 } |
342 | 5320 } |
5321 } else { | |
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|
5322 if (_cm->verbose_low()) { |
342 | 5323 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
5324 "elapsed = %1.2lfms <<<<<<<<<<", | |
5325 _task_id, _time_target_ms, elapsed_time_ms); | |
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|
5326 } |
342 | 5327 } |
5328 | |
5329 _claimed = false; | |
5330 } | |
5331 | |
5332 CMTask::CMTask(int task_id, | |
5333 ConcurrentMark* cm, | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
changeset
|
5334 size_t* marked_bytes, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
5335 BitMap* card_bm, |
342 | 5336 CMTaskQueue* task_queue, |
5337 CMTaskQueueSet* task_queues) | |
5338 : _g1h(G1CollectedHeap::heap()), | |
5339 _task_id(task_id), _cm(cm), | |
5340 _claimed(false), | |
5341 _nextMarkBitMap(NULL), _hash_seed(17), | |
5342 _task_queue(task_queue), | |
5343 _task_queues(task_queues), | |
3771 | 5344 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
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|
5345 _aborted_region(MemRegion()), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
changeset
|
5346 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
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|
5347 _card_bm(card_bm) { |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
5348 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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1022
diff
changeset
|
5349 guarantee(task_queues != NULL, "invariant"); |
342 | 5350 |
5351 statsOnly( _clock_due_to_scanning = 0; | |
5352 _clock_due_to_marking = 0 ); | |
5353 | |
5354 _marking_step_diffs_ms.add(0.5); | |
5355 } | |
2435
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5356 |
371bbc844bf1
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diff
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|
5357 // 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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|
5358 // 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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|
5359 // header for a particular value and they should be kept consistent |
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|
5360 // with the corresponding macro. Also note that most of the macros add |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
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|
5361 // 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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diff
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|
5362 // easier to compose. |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5363 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5364 // 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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|
5365 // identify them easily in a large log file. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5366 #define G1PPRL_LINE_PREFIX "###" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5367 |
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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|
5368 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5369 #ifdef _LP64 |
371bbc844bf1
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|
5370 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
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|
5371 #else // _LP64 |
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|
5372 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
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|
5373 #endif // _LP64 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5374 |
371bbc844bf1
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diff
changeset
|
5375 // For per-region info |
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|
5376 #define G1PPRL_TYPE_FORMAT " %-4s" |
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|
5377 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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|
5378 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
371bbc844bf1
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|
5379 #define G1PPRL_BYTE_H_FORMAT " %9s" |
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|
5380 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
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diff
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|
5381 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5382 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5383 // For summary info |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5384 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5385 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
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|
5386 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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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|
5387 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5388 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5389 G1PrintRegionLivenessInfoClosure:: |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
5390 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5391 : _out(out), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
5392 _total_used_bytes(0), _total_capacity_bytes(0), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5393 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5394 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5395 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5396 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5397 MemRegion g1_committed = g1h->g1_committed(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5398 MemRegion g1_reserved = g1h->g1_reserved(); |
371bbc844bf1
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diff
changeset
|
5399 double now = os::elapsedTime(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5400 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5401 // Print the header of the output. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
5402 _out->cr(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5403 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
5404 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5405 G1PPRL_SUM_ADDR_FORMAT("committed") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5406 G1PPRL_SUM_ADDR_FORMAT("reserved") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5407 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5408 g1_committed.start(), g1_committed.end(), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5409 g1_reserved.start(), g1_reserved.end(), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
5410 HeapRegion::GrainBytes); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
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|
5411 _out->print_cr(G1PPRL_LINE_PREFIX); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5412 _out->print_cr(G1PPRL_LINE_PREFIX |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
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|
5413 G1PPRL_TYPE_H_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
5414 G1PPRL_ADDR_BASE_H_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
5415 G1PPRL_BYTE_H_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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|
5416 G1PPRL_BYTE_H_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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|
5417 G1PPRL_BYTE_H_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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|
5418 G1PPRL_DOUBLE_H_FORMAT, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
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|
5419 "type", "address-range", |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
5420 "used", "prev-live", "next-live", "gc-eff"); |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
5421 _out->print_cr(G1PPRL_LINE_PREFIX |
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
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|
5422 G1PPRL_TYPE_H_FORMAT |
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
5423 G1PPRL_ADDR_BASE_H_FORMAT |
5cc33133bc6d
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johnc
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3975
diff
changeset
|
5424 G1PPRL_BYTE_H_FORMAT |
5cc33133bc6d
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johnc
parents:
3975
diff
changeset
|
5425 G1PPRL_BYTE_H_FORMAT |
5cc33133bc6d
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3975
diff
changeset
|
5426 G1PPRL_BYTE_H_FORMAT |
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
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3975
diff
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|
5427 G1PPRL_DOUBLE_H_FORMAT, |
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
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3975
diff
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|
5428 "", "", |
5cc33133bc6d
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3975
diff
changeset
|
5429 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
2435
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diff
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|
5430 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5431 |
371bbc844bf1
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diff
changeset
|
5432 // It takes as a parameter a reference to one of the _hum_* fields, it |
371bbc844bf1
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diff
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|
5433 // deduces the corresponding value for a region in a humongous region |
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diff
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|
5434 // series (either the region size, or what's left if the _hum_* field |
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diff
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|
5435 // is < the region size), and updates the _hum_* field accordingly. |
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diff
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|
5436 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5437 size_t bytes = 0; |
371bbc844bf1
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diff
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|
5438 // The > 0 check is to deal with the prev and next live bytes which |
371bbc844bf1
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diff
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|
5439 // could be 0. |
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changeset
|
5440 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
5441 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
371bbc844bf1
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diff
changeset
|
5442 *hum_bytes -= bytes; |
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diff
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|
5443 } |
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diff
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|
5444 return bytes; |
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diff
changeset
|
5445 } |
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diff
changeset
|
5446 |
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diff
changeset
|
5447 // It deduces the values for a region in a humongous region series |
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diff
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|
5448 // from the _hum_* fields and updates those accordingly. It assumes |
371bbc844bf1
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diff
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|
5449 // that that _hum_* fields have already been set up from the "starts |
371bbc844bf1
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diff
changeset
|
5450 // humongous" region and we visit the regions in address order. |
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diff
changeset
|
5451 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
371bbc844bf1
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diff
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|
5452 size_t* capacity_bytes, |
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diff
changeset
|
5453 size_t* prev_live_bytes, |
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diff
changeset
|
5454 size_t* next_live_bytes) { |
371bbc844bf1
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diff
changeset
|
5455 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
371bbc844bf1
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diff
changeset
|
5456 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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changeset
|
5457 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5458 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5459 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5460 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5461 |
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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
|
5462 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5463 const char* type = ""; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5464 HeapWord* bottom = r->bottom(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5465 HeapWord* end = r->end(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5466 size_t capacity_bytes = r->capacity(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5467 size_t used_bytes = r->used(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5468 size_t prev_live_bytes = r->live_bytes(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5469 size_t next_live_bytes = r->next_live_bytes(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5470 double gc_eff = r->gc_efficiency(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5471 if (r->used() == 0) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5472 type = "FREE"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
5473 } else if (r->is_survivor()) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5474 type = "SURV"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5475 } else if (r->is_young()) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5476 type = "EDEN"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5477 } else if (r->startsHumongous()) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5478 type = "HUMS"; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5479 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5480 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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|
5481 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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|
5482 "they should have been zeroed after the last time we used them"); |
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|
5483 // Set up the _hum_* fields. |
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|
5484 _hum_capacity_bytes = capacity_bytes; |
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|
5485 _hum_used_bytes = used_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
5486 _hum_prev_live_bytes = prev_live_bytes; |
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|
5487 _hum_next_live_bytes = next_live_bytes; |
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|
5488 get_hum_bytes(&used_bytes, &capacity_bytes, |
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|
5489 &prev_live_bytes, &next_live_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5490 end = bottom + HeapRegion::GrainWords; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5491 } else if (r->continuesHumongous()) { |
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diff
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|
5492 type = "HUMC"; |
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diff
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|
5493 get_hum_bytes(&used_bytes, &capacity_bytes, |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
5494 &prev_live_bytes, &next_live_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5495 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5496 } else { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5497 type = "OLD"; |
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diff
changeset
|
5498 } |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5499 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5500 _total_used_bytes += used_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
5501 _total_capacity_bytes += capacity_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5502 _total_prev_live_bytes += prev_live_bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5503 _total_next_live_bytes += next_live_bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5504 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5505 // Print a line for this particular region. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5506 _out->print_cr(G1PPRL_LINE_PREFIX |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5507 G1PPRL_TYPE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5508 G1PPRL_ADDR_BASE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5509 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5510 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
5511 G1PPRL_BYTE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5512 G1PPRL_DOUBLE_FORMAT, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5513 type, bottom, end, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5514 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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diff
changeset
|
5515 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5516 return false; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5517 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
5518 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5519 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5520 // Print the footer of the output. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
5521 _out->print_cr(G1PPRL_LINE_PREFIX); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5522 _out->print_cr(G1PPRL_LINE_PREFIX |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5523 " SUMMARY" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5524 G1PPRL_SUM_MB_FORMAT("capacity") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5525 G1PPRL_SUM_MB_PERC_FORMAT("used") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
5526 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
5527 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5528 bytes_to_mb(_total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5529 bytes_to_mb(_total_used_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5530 perc(_total_used_bytes, _total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5531 bytes_to_mb(_total_prev_live_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5532 perc(_total_prev_live_bytes, _total_capacity_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
5533 bytes_to_mb(_total_next_live_bytes), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
5534 perc(_total_next_live_bytes, _total_capacity_bytes)); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
5535 _out->cr(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
5536 } |