Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 3316:cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
Summary: We were calling STS join and leave during a STW pause and we are not suppoesed to. I now only call those during concurrent phase. I also added stress code in the non-product builds to force an overflows (the condition that ws uncovering the bug) to make sure it does not happen again.
Reviewed-by: johnc, brutisso
author | tonyp |
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date | Fri, 29 Apr 2011 12:40:49 -0400 |
parents | 8f1042ff784d |
children | 063382f9b575 |
rev | line source |
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342 | 1 /* |
2149 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
31 #include "gc_implementation/g1/g1RemSet.hpp" | |
32 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
33 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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34 #include "gc_implementation/shared/vmGCOperations.hpp" |
1972 | 35 #include "memory/genOopClosures.inline.hpp" |
36 #include "memory/referencePolicy.hpp" | |
37 #include "memory/resourceArea.hpp" | |
38 #include "oops/oop.inline.hpp" | |
39 #include "runtime/handles.inline.hpp" | |
40 #include "runtime/java.hpp" | |
342 | 41 |
42 // | |
43 // CMS Bit Map Wrapper | |
44 | |
45 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter): | |
46 _bm((uintptr_t*)NULL,0), | |
47 _shifter(shifter) { | |
48 _bmStartWord = (HeapWord*)(rs.base()); | |
49 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
50 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
51 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
52 | |
53 guarantee(brs.is_reserved(), "couldn't allocate CMS bit map"); | |
54 // For now we'll just commit all of the bit map up fromt. | |
55 // Later on we'll try to be more parsimonious with swap. | |
56 guarantee(_virtual_space.initialize(brs, brs.size()), | |
57 "couldn't reseve backing store for CMS bit map"); | |
58 assert(_virtual_space.committed_size() == brs.size(), | |
59 "didn't reserve backing store for all of CMS bit map?"); | |
60 _bm.set_map((uintptr_t*)_virtual_space.low()); | |
61 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
62 _bmWordSize, "inconsistency in bit map sizing"); | |
63 _bm.set_size(_bmWordSize >> _shifter); | |
64 } | |
65 | |
66 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
67 HeapWord* limit) const { | |
68 // First we must round addr *up* to a possible object boundary. | |
69 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
70 HeapWordSize << _shifter); | |
71 size_t addrOffset = heapWordToOffset(addr); | |
72 if (limit == NULL) limit = _bmStartWord + _bmWordSize; | |
73 size_t limitOffset = heapWordToOffset(limit); | |
74 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
75 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
76 assert(nextAddr >= addr, "get_next_one postcondition"); | |
77 assert(nextAddr == limit || isMarked(nextAddr), | |
78 "get_next_one postcondition"); | |
79 return nextAddr; | |
80 } | |
81 | |
82 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
83 HeapWord* limit) const { | |
84 size_t addrOffset = heapWordToOffset(addr); | |
85 if (limit == NULL) limit = _bmStartWord + _bmWordSize; | |
86 size_t limitOffset = heapWordToOffset(limit); | |
87 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
88 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
89 assert(nextAddr >= addr, "get_next_one postcondition"); | |
90 assert(nextAddr == limit || !isMarked(nextAddr), | |
91 "get_next_one postcondition"); | |
92 return nextAddr; | |
93 } | |
94 | |
95 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
96 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
97 return (int) (diff >> _shifter); | |
98 } | |
99 | |
100 bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) { | |
101 HeapWord* left = MAX2(_bmStartWord, mr.start()); | |
102 HeapWord* right = MIN2(_bmStartWord + _bmWordSize, mr.end()); | |
103 if (right > left) { | |
104 // Right-open interval [leftOffset, rightOffset). | |
105 return _bm.iterate(cl, heapWordToOffset(left), heapWordToOffset(right)); | |
106 } else { | |
107 return true; | |
108 } | |
109 } | |
110 | |
111 void CMBitMapRO::mostly_disjoint_range_union(BitMap* from_bitmap, | |
112 size_t from_start_index, | |
113 HeapWord* to_start_word, | |
114 size_t word_num) { | |
115 _bm.mostly_disjoint_range_union(from_bitmap, | |
116 from_start_index, | |
117 heapWordToOffset(to_start_word), | |
118 word_num); | |
119 } | |
120 | |
121 #ifndef PRODUCT | |
122 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
123 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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124 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
342 | 125 "size inconsistency"); |
126 return _bmStartWord == (HeapWord*)(rs.base()) && | |
127 _bmWordSize == rs.size()>>LogHeapWordSize; | |
128 } | |
129 #endif | |
130 | |
131 void CMBitMap::clearAll() { | |
132 _bm.clear(); | |
133 return; | |
134 } | |
135 | |
136 void CMBitMap::markRange(MemRegion mr) { | |
137 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
138 assert(!mr.is_empty(), "unexpected empty region"); | |
139 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
140 ((HeapWord *) mr.end())), | |
141 "markRange memory region end is not card aligned"); | |
142 // convert address range into offset range | |
143 _bm.at_put_range(heapWordToOffset(mr.start()), | |
144 heapWordToOffset(mr.end()), true); | |
145 } | |
146 | |
147 void CMBitMap::clearRange(MemRegion mr) { | |
148 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
149 assert(!mr.is_empty(), "unexpected empty region"); | |
150 // convert address range into offset range | |
151 _bm.at_put_range(heapWordToOffset(mr.start()), | |
152 heapWordToOffset(mr.end()), false); | |
153 } | |
154 | |
155 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
156 HeapWord* end_addr) { | |
157 HeapWord* start = getNextMarkedWordAddress(addr); | |
158 start = MIN2(start, end_addr); | |
159 HeapWord* end = getNextUnmarkedWordAddress(start); | |
160 end = MIN2(end, end_addr); | |
161 assert(start <= end, "Consistency check"); | |
162 MemRegion mr(start, end); | |
163 if (!mr.is_empty()) { | |
164 clearRange(mr); | |
165 } | |
166 return mr; | |
167 } | |
168 | |
169 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
170 _base(NULL), _cm(cm) | |
171 #ifdef ASSERT | |
172 , _drain_in_progress(false) | |
173 , _drain_in_progress_yields(false) | |
174 #endif | |
175 {} | |
176 | |
177 void CMMarkStack::allocate(size_t size) { | |
178 _base = NEW_C_HEAP_ARRAY(oop, size); | |
179 if (_base == NULL) | |
180 vm_exit_during_initialization("Failed to allocate " | |
181 "CM region mark stack"); | |
182 _index = 0; | |
183 // QQQQ cast ... | |
184 _capacity = (jint) size; | |
185 _oops_do_bound = -1; | |
186 NOT_PRODUCT(_max_depth = 0); | |
187 } | |
188 | |
189 CMMarkStack::~CMMarkStack() { | |
190 if (_base != NULL) FREE_C_HEAP_ARRAY(oop, _base); | |
191 } | |
192 | |
193 void CMMarkStack::par_push(oop ptr) { | |
194 while (true) { | |
195 if (isFull()) { | |
196 _overflow = true; | |
197 return; | |
198 } | |
199 // Otherwise... | |
200 jint index = _index; | |
201 jint next_index = index+1; | |
202 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
203 if (res == index) { | |
204 _base[index] = ptr; | |
205 // Note that we don't maintain this atomically. We could, but it | |
206 // doesn't seem necessary. | |
207 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
208 return; | |
209 } | |
210 // Otherwise, we need to try again. | |
211 } | |
212 } | |
213 | |
214 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
215 while (true) { | |
216 if (isFull()) { | |
217 _overflow = true; | |
218 return; | |
219 } | |
220 // Otherwise... | |
221 jint index = _index; | |
222 jint next_index = index + n; | |
223 if (next_index > _capacity) { | |
224 _overflow = true; | |
225 return; | |
226 } | |
227 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
228 if (res == index) { | |
229 for (int i = 0; i < n; i++) { | |
230 int ind = index + i; | |
231 assert(ind < _capacity, "By overflow test above."); | |
232 _base[ind] = ptr_arr[i]; | |
233 } | |
234 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
235 return; | |
236 } | |
237 // Otherwise, we need to try again. | |
238 } | |
239 } | |
240 | |
241 | |
242 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
243 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
244 jint start = _index; | |
245 jint next_index = start + n; | |
246 if (next_index > _capacity) { | |
247 _overflow = true; | |
248 return; | |
249 } | |
250 // Otherwise. | |
251 _index = next_index; | |
252 for (int i = 0; i < n; i++) { | |
253 int ind = start + i; | |
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254 assert(ind < _capacity, "By overflow test above."); |
342 | 255 _base[ind] = ptr_arr[i]; |
256 } | |
257 } | |
258 | |
259 | |
260 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
261 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
262 jint index = _index; | |
263 if (index == 0) { | |
264 *n = 0; | |
265 return false; | |
266 } else { | |
267 int k = MIN2(max, index); | |
268 jint new_ind = index - k; | |
269 for (int j = 0; j < k; j++) { | |
270 ptr_arr[j] = _base[new_ind + j]; | |
271 } | |
272 _index = new_ind; | |
273 *n = k; | |
274 return true; | |
275 } | |
276 } | |
277 | |
278 | |
279 CMRegionStack::CMRegionStack() : _base(NULL) {} | |
280 | |
281 void CMRegionStack::allocate(size_t size) { | |
282 _base = NEW_C_HEAP_ARRAY(MemRegion, size); | |
283 if (_base == NULL) | |
284 vm_exit_during_initialization("Failed to allocate " | |
285 "CM region mark stack"); | |
286 _index = 0; | |
287 // QQQQ cast ... | |
288 _capacity = (jint) size; | |
289 } | |
290 | |
291 CMRegionStack::~CMRegionStack() { | |
292 if (_base != NULL) FREE_C_HEAP_ARRAY(oop, _base); | |
293 } | |
294 | |
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295 void CMRegionStack::push_lock_free(MemRegion mr) { |
342 | 296 assert(mr.word_size() > 0, "Precondition"); |
297 while (true) { | |
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298 jint index = _index; |
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299 |
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300 if (index >= _capacity) { |
342 | 301 _overflow = true; |
302 return; | |
303 } | |
304 // Otherwise... | |
305 jint next_index = index+1; | |
306 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
307 if (res == index) { | |
308 _base[index] = mr; | |
309 return; | |
310 } | |
311 // Otherwise, we need to try again. | |
312 } | |
313 } | |
314 | |
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315 // Lock-free pop of the region stack. Called during the concurrent |
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316 // marking / remark phases. Should only be called in tandem with |
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317 // other lock-free pops. |
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318 MemRegion CMRegionStack::pop_lock_free() { |
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() { | |
384 bool result = false; | |
385 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
386 for (int i = 0; i < _oops_do_bound; ++i) { | |
387 MemRegion mr = _base[i]; | |
388 if (mr.start() != NULL) { | |
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389 assert(mr.end() != NULL, "invariant"); |
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390 assert(mr.word_size() > 0, "invariant"); |
342 | 391 HeapRegion* hr = g1h->heap_region_containing(mr.start()); |
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392 assert(hr != NULL, "invariant"); |
342 | 393 if (hr->in_collection_set()) { |
394 // The region points into the collection set | |
395 _base[i] = MemRegion(); | |
396 result = true; | |
397 } | |
398 } else { | |
399 // that entry was invalidated... let's skip it | |
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400 assert(mr.end() == NULL, "invariant"); |
342 | 401 } |
402 } | |
403 return result; | |
404 } | |
405 | |
406 template<class OopClosureClass> | |
407 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
408 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
409 || SafepointSynchronize::is_at_safepoint(), | |
410 "Drain recursion must be yield-safe."); | |
411 bool res = true; | |
412 debug_only(_drain_in_progress = true); | |
413 debug_only(_drain_in_progress_yields = yield_after); | |
414 while (!isEmpty()) { | |
415 oop newOop = pop(); | |
416 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
417 assert(newOop->is_oop(), "Expected an oop"); | |
418 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
419 "only grey objects on this stack"); | |
420 // iterate over the oops in this oop, marking and pushing | |
421 // the ones in CMS generation. | |
422 newOop->oop_iterate(cl); | |
423 if (yield_after && _cm->do_yield_check()) { | |
424 res = false; break; | |
425 } | |
426 } | |
427 debug_only(_drain_in_progress = false); | |
428 return res; | |
429 } | |
430 | |
431 void CMMarkStack::oops_do(OopClosure* f) { | |
432 if (_index == 0) return; | |
433 assert(_oops_do_bound != -1 && _oops_do_bound <= _index, | |
434 "Bound must be set."); | |
435 for (int i = 0; i < _oops_do_bound; i++) { | |
436 f->do_oop(&_base[i]); | |
437 } | |
438 _oops_do_bound = -1; | |
439 } | |
440 | |
441 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
442 return (_g1h->is_obj_ill(obj) | |
443 || (_g1h->is_in_permanent(obj) | |
444 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
445 } | |
446 | |
447 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
448 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
449 #endif // _MSC_VER | |
450 | |
451 ConcurrentMark::ConcurrentMark(ReservedSpace rs, | |
452 int max_regions) : | |
453 _markBitMap1(rs, MinObjAlignment - 1), | |
454 _markBitMap2(rs, MinObjAlignment - 1), | |
455 | |
456 _parallel_marking_threads(0), | |
457 _sleep_factor(0.0), | |
458 _marking_task_overhead(1.0), | |
459 _cleanup_sleep_factor(0.0), | |
460 _cleanup_task_overhead(1.0), | |
2152 | 461 _cleanup_list("Cleanup List"), |
342 | 462 _region_bm(max_regions, false /* in_resource_area*/), |
463 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> | |
464 CardTableModRefBS::card_shift, | |
465 false /* in_resource_area*/), | |
466 _prevMarkBitMap(&_markBitMap1), | |
467 _nextMarkBitMap(&_markBitMap2), | |
468 _at_least_one_mark_complete(false), | |
469 | |
470 _markStack(this), | |
471 _regionStack(), | |
472 // _finger set in set_non_marking_state | |
473 | |
474 _max_task_num(MAX2(ParallelGCThreads, (size_t)1)), | |
475 // _active_tasks set in set_non_marking_state | |
476 // _tasks set inside the constructor | |
477 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
478 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
479 | |
480 _has_overflown(false), | |
481 _concurrent(false), | |
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482 _has_aborted(false), |
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483 _restart_for_overflow(false), |
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484 _concurrent_marking_in_progress(false), |
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485 _should_gray_objects(false), |
342 | 486 |
487 // _verbose_level set below | |
488 | |
489 _init_times(), | |
490 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
491 _cleanup_times(), | |
492 _total_counting_time(0.0), | |
493 _total_rs_scrub_time(0.0), | |
494 | |
936 | 495 _parallel_workers(NULL) |
342 | 496 { |
497 CMVerboseLevel verbose_level = | |
498 (CMVerboseLevel) G1MarkingVerboseLevel; | |
499 if (verbose_level < no_verbose) | |
500 verbose_level = no_verbose; | |
501 if (verbose_level > high_verbose) | |
502 verbose_level = high_verbose; | |
503 _verbose_level = verbose_level; | |
504 | |
505 if (verbose_low()) | |
506 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " | |
507 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
508 | |
1284 | 509 _markStack.allocate(MarkStackSize); |
751 | 510 _regionStack.allocate(G1MarkRegionStackSize); |
342 | 511 |
512 // Create & start a ConcurrentMark thread. | |
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513 _cmThread = new ConcurrentMarkThread(this); |
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514 assert(cmThread() != NULL, "CM Thread should have been created"); |
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515 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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516 |
342 | 517 _g1h = G1CollectedHeap::heap(); |
518 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
519 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
520 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
521 | |
522 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 523 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 524 |
525 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
526 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num); | |
527 | |
528 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail | |
529 _active_tasks = _max_task_num; | |
530 for (int i = 0; i < (int) _max_task_num; ++i) { | |
531 CMTaskQueue* task_queue = new CMTaskQueue(); | |
532 task_queue->initialize(); | |
533 _task_queues->register_queue(i, task_queue); | |
534 | |
535 _tasks[i] = new CMTask(i, this, task_queue, _task_queues); | |
536 _accum_task_vtime[i] = 0.0; | |
537 } | |
538 | |
1284 | 539 if (ConcGCThreads > ParallelGCThreads) { |
540 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
342 | 541 "than ParallelGCThreads."); |
542 } | |
543 if (ParallelGCThreads == 0) { | |
544 // if we are not running with any parallel GC threads we will not | |
545 // spawn any marking threads either | |
546 _parallel_marking_threads = 0; | |
547 _sleep_factor = 0.0; | |
548 _marking_task_overhead = 1.0; | |
549 } else { | |
1284 | 550 if (ConcGCThreads > 0) { |
551 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
342 | 552 // if both are set |
553 | |
1284 | 554 _parallel_marking_threads = ConcGCThreads; |
342 | 555 _sleep_factor = 0.0; |
556 _marking_task_overhead = 1.0; | |
751 | 557 } else if (G1MarkingOverheadPercent > 0) { |
342 | 558 // we will calculate the number of parallel marking threads |
559 // based on a target overhead with respect to the soft real-time | |
560 // goal | |
561 | |
751 | 562 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 563 double overall_cm_overhead = |
751 | 564 (double) MaxGCPauseMillis * marking_overhead / |
565 (double) GCPauseIntervalMillis; | |
342 | 566 double cpu_ratio = 1.0 / (double) os::processor_count(); |
567 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
568 double marking_task_overhead = | |
569 overall_cm_overhead / marking_thread_num * | |
570 (double) os::processor_count(); | |
571 double sleep_factor = | |
572 (1.0 - marking_task_overhead) / marking_task_overhead; | |
573 | |
574 _parallel_marking_threads = (size_t) marking_thread_num; | |
575 _sleep_factor = sleep_factor; | |
576 _marking_task_overhead = marking_task_overhead; | |
577 } else { | |
578 _parallel_marking_threads = MAX2((ParallelGCThreads + 2) / 4, (size_t)1); | |
579 _sleep_factor = 0.0; | |
580 _marking_task_overhead = 1.0; | |
581 } | |
582 | |
583 if (parallel_marking_threads() > 1) | |
584 _cleanup_task_overhead = 1.0; | |
585 else | |
586 _cleanup_task_overhead = marking_task_overhead(); | |
587 _cleanup_sleep_factor = | |
588 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
589 | |
590 #if 0 | |
591 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
592 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
593 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
594 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
595 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
596 #endif | |
597 | |
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598 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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599 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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600 (int) _parallel_marking_threads, false, true); |
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601 if (_parallel_workers == NULL) { |
342 | 602 vm_exit_during_initialization("Failed necessary allocation."); |
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603 } else { |
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604 _parallel_workers->initialize_workers(); |
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605 } |
342 | 606 } |
607 | |
608 // so that the call below can read a sensible value | |
609 _heap_start = (HeapWord*) rs.base(); | |
610 set_non_marking_state(); | |
611 } | |
612 | |
613 void ConcurrentMark::update_g1_committed(bool force) { | |
614 // If concurrent marking is not in progress, then we do not need to | |
615 // update _heap_end. This has a subtle and important | |
616 // side-effect. Imagine that two evacuation pauses happen between | |
617 // marking completion and remark. The first one can grow the | |
618 // heap (hence now the finger is below the heap end). Then, the | |
619 // second one could unnecessarily push regions on the region | |
620 // stack. This causes the invariant that the region stack is empty | |
621 // at the beginning of remark to be false. By ensuring that we do | |
622 // not observe heap expansions after marking is complete, then we do | |
623 // not have this problem. | |
624 if (!concurrent_marking_in_progress() && !force) | |
625 return; | |
626 | |
627 MemRegion committed = _g1h->g1_committed(); | |
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628 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 629 HeapWord* new_end = committed.end(); |
630 if (new_end > _heap_end) { | |
631 // The heap has been expanded. | |
632 | |
633 _heap_end = new_end; | |
634 } | |
635 // Notice that the heap can also shrink. However, this only happens | |
636 // during a Full GC (at least currently) and the entire marking | |
637 // phase will bail out and the task will not be restarted. So, let's | |
638 // do nothing. | |
639 } | |
640 | |
641 void ConcurrentMark::reset() { | |
642 // Starting values for these two. This should be called in a STW | |
643 // phase. CM will be notified of any future g1_committed expansions | |
644 // will be at the end of evacuation pauses, when tasks are | |
645 // inactive. | |
646 MemRegion committed = _g1h->g1_committed(); | |
647 _heap_start = committed.start(); | |
648 _heap_end = committed.end(); | |
649 | |
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650 // Separated the asserts so that we know which one fires. |
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651 assert(_heap_start != NULL, "heap bounds should look ok"); |
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652 assert(_heap_end != NULL, "heap bounds should look ok"); |
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653 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 654 |
655 // reset all the marking data structures and any necessary flags | |
656 clear_marking_state(); | |
657 | |
658 if (verbose_low()) | |
659 gclog_or_tty->print_cr("[global] resetting"); | |
660 | |
661 // We do reset all of them, since different phases will use | |
662 // different number of active threads. So, it's easiest to have all | |
663 // of them ready. | |
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664 for (int i = 0; i < (int) _max_task_num; ++i) { |
342 | 665 _tasks[i]->reset(_nextMarkBitMap); |
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666 } |
342 | 667 |
668 // we need this to make sure that the flag is on during the evac | |
669 // pause with initial mark piggy-backed | |
670 set_concurrent_marking_in_progress(); | |
671 } | |
672 | |
673 void ConcurrentMark::set_phase(size_t active_tasks, bool concurrent) { | |
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674 assert(active_tasks <= _max_task_num, "we should not have more"); |
342 | 675 |
676 _active_tasks = active_tasks; | |
677 // Need to update the three data structures below according to the | |
678 // number of active threads for this phase. | |
679 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
680 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
681 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
682 | |
683 _concurrent = concurrent; | |
684 // We propagate this to all tasks, not just the active ones. | |
685 for (int i = 0; i < (int) _max_task_num; ++i) | |
686 _tasks[i]->set_concurrent(concurrent); | |
687 | |
688 if (concurrent) { | |
689 set_concurrent_marking_in_progress(); | |
690 } else { | |
691 // We currently assume that the concurrent flag has been set to | |
692 // false before we start remark. At this point we should also be | |
693 // in a STW phase. | |
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694 assert(!concurrent_marking_in_progress(), "invariant"); |
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695 assert(_finger == _heap_end, "only way to get here"); |
342 | 696 update_g1_committed(true); |
697 } | |
698 } | |
699 | |
700 void ConcurrentMark::set_non_marking_state() { | |
701 // We set the global marking state to some default values when we're | |
702 // not doing marking. | |
703 clear_marking_state(); | |
704 _active_tasks = 0; | |
705 clear_concurrent_marking_in_progress(); | |
706 } | |
707 | |
708 ConcurrentMark::~ConcurrentMark() { | |
709 for (int i = 0; i < (int) _max_task_num; ++i) { | |
710 delete _task_queues->queue(i); | |
711 delete _tasks[i]; | |
712 } | |
713 delete _task_queues; | |
714 FREE_C_HEAP_ARRAY(CMTask*, _max_task_num); | |
715 } | |
716 | |
717 // This closure is used to mark refs into the g1 generation | |
718 // from external roots in the CMS bit map. | |
719 // Called at the first checkpoint. | |
720 // | |
721 | |
722 void ConcurrentMark::clearNextBitmap() { | |
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723 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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724 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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725 |
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726 // Make sure that the concurrent mark thread looks to still be in |
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727 // the current cycle. |
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728 guarantee(cmThread()->during_cycle(), "invariant"); |
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729 |
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730 // We are finishing up the current cycle by clearing the next |
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731 // marking bitmap and getting it ready for the next cycle. During |
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732 // this time no other cycle can start. So, let's make sure that this |
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733 // is the case. |
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734 guarantee(!g1h->mark_in_progress(), "invariant"); |
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735 |
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736 // clear the mark bitmap (no grey objects to start with). |
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737 // We need to do this in chunks and offer to yield in between |
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738 // each chunk. |
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739 HeapWord* start = _nextMarkBitMap->startWord(); |
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740 HeapWord* end = _nextMarkBitMap->endWord(); |
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741 HeapWord* cur = start; |
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742 size_t chunkSize = M; |
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743 while (cur < end) { |
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744 HeapWord* next = cur + chunkSize; |
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745 if (next > end) |
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746 next = end; |
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747 MemRegion mr(cur,next); |
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748 _nextMarkBitMap->clearRange(mr); |
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749 cur = next; |
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750 do_yield_check(); |
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751 |
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752 // Repeat the asserts from above. We'll do them as asserts here to |
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753 // minimize their overhead on the product. However, we'll have |
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754 // them as guarantees at the beginning / end of the bitmap |
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755 // clearing to get some checking in the product. |
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756 assert(cmThread()->during_cycle(), "invariant"); |
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757 assert(!g1h->mark_in_progress(), "invariant"); |
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758 } |
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759 |
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760 // Repeat the asserts from above. |
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761 guarantee(cmThread()->during_cycle(), "invariant"); |
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762 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 763 } |
764 | |
765 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
766 public: | |
767 bool doHeapRegion(HeapRegion* r) { | |
768 if (!r->continuesHumongous()) { | |
769 r->note_start_of_marking(true); | |
770 } | |
771 return false; | |
772 } | |
773 }; | |
774 | |
775 void ConcurrentMark::checkpointRootsInitialPre() { | |
776 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
777 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
778 | |
779 _has_aborted = false; | |
780 | |
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781 #ifndef PRODUCT |
1044 | 782 if (G1PrintReachableAtInitialMark) { |
1388 | 783 print_reachable("at-cycle-start", |
784 true /* use_prev_marking */, true /* all */); | |
1044 | 785 } |
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786 #endif |
342 | 787 |
788 // Initialise marking structures. This has to be done in a STW phase. | |
789 reset(); | |
790 } | |
791 | |
792 class CMMarkRootsClosure: public OopsInGenClosure { | |
793 private: | |
794 ConcurrentMark* _cm; | |
795 G1CollectedHeap* _g1h; | |
796 bool _do_barrier; | |
797 | |
798 public: | |
799 CMMarkRootsClosure(ConcurrentMark* cm, | |
800 G1CollectedHeap* g1h, | |
801 bool do_barrier) : _cm(cm), _g1h(g1h), | |
802 _do_barrier(do_barrier) { } | |
803 | |
845
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804 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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805 virtual void do_oop( oop* p) { do_oop_work(p); } |
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806 |
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807 template <class T> void do_oop_work(T* p) { |
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808 T heap_oop = oopDesc::load_heap_oop(p); |
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809 if (!oopDesc::is_null(heap_oop)) { |
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810 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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811 assert(obj->is_oop() || obj->mark() == NULL, |
342 | 812 "expected an oop, possibly with mark word displaced"); |
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813 HeapWord* addr = (HeapWord*)obj; |
342 | 814 if (_g1h->is_in_g1_reserved(addr)) { |
845
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815 _cm->grayRoot(obj); |
342 | 816 } |
817 } | |
818 if (_do_barrier) { | |
819 assert(!_g1h->is_in_g1_reserved(p), | |
820 "Should be called on external roots"); | |
821 do_barrier(p); | |
822 } | |
823 } | |
824 }; | |
825 | |
826 void ConcurrentMark::checkpointRootsInitialPost() { | |
827 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
828 | |
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829 // If we force an overflow during remark, the remark operation will |
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830 // actually abort and we'll restart concurrent marking. If we always |
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831 // force an oveflow during remark we'll never actually complete the |
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832 // marking phase. So, we initilize this here, at the start of the |
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833 // cycle, so that at the remaining overflow number will decrease at |
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834 // every remark and we'll eventually not need to cause one. |
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835 force_overflow_stw()->init(); |
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836 |
342 | 837 // For each region note start of marking. |
838 NoteStartOfMarkHRClosure startcl; | |
839 g1h->heap_region_iterate(&startcl); | |
840 | |
841 // Start weak-reference discovery. | |
842 ReferenceProcessor* rp = g1h->ref_processor(); | |
843 rp->verify_no_references_recorded(); | |
844 rp->enable_discovery(); // enable ("weak") refs discovery | |
457
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845 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 846 |
847 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
1317
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848 // This is the start of the marking cycle, we're expected all |
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849 // threads to have SATB queues with active set to false. |
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850 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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851 false /* expected_active */); |
342 | 852 |
853 // update_g1_committed() will be called at the end of an evac pause | |
854 // when marking is on. So, it's also called at the end of the | |
855 // initial-mark pause to update the heap end, if the heap expands | |
856 // during it. No need to call it here. | |
857 } | |
858 | |
859 // Checkpoint the roots into this generation from outside | |
860 // this generation. [Note this initial checkpoint need only | |
861 // be approximate -- we'll do a catch up phase subsequently.] | |
862 void ConcurrentMark::checkpointRootsInitial() { | |
863 assert(SafepointSynchronize::is_at_safepoint(), "world should be stopped"); | |
864 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
865 | |
866 double start = os::elapsedTime(); | |
867 | |
868 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); | |
869 g1p->record_concurrent_mark_init_start(); | |
870 checkpointRootsInitialPre(); | |
871 | |
872 // YSR: when concurrent precleaning is in place, we'll | |
873 // need to clear the cached card table here | |
874 | |
875 ResourceMark rm; | |
876 HandleMark hm; | |
877 | |
878 g1h->ensure_parsability(false); | |
879 g1h->perm_gen()->save_marks(); | |
880 | |
881 CMMarkRootsClosure notOlder(this, g1h, false); | |
882 CMMarkRootsClosure older(this, g1h, true); | |
883 | |
884 g1h->set_marking_started(); | |
885 g1h->rem_set()->prepare_for_younger_refs_iterate(false); | |
886 | |
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887 g1h->process_strong_roots(true, // activate StrongRootsScope |
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888 false, // fake perm gen collection |
342 | 889 SharedHeap::SO_AllClasses, |
890 ¬Older, // Regular roots | |
989
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891 NULL, // do not visit active blobs |
342 | 892 &older // Perm Gen Roots |
893 ); | |
894 checkpointRootsInitialPost(); | |
895 | |
896 // Statistics. | |
897 double end = os::elapsedTime(); | |
898 _init_times.add((end - start) * 1000.0); | |
899 | |
900 g1p->record_concurrent_mark_init_end(); | |
901 } | |
902 | |
903 /* | |
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904 * Notice that in the next two methods, we actually leave the STS |
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905 * during the barrier sync and join it immediately afterwards. If we |
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906 * do not do this, the following deadlock can occur: one thread could |
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907 * be in the barrier sync code, waiting for the other thread to also |
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908 * sync up, whereas another one could be trying to yield, while also |
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909 * waiting for the other threads to sync up too. |
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910 * |
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911 * Note, however, that this code is also used during remark and in |
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912 * this case we should not attempt to leave / enter the STS, otherwise |
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913 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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914 * (product). So we should only leave / enter the STS if we are |
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915 * operating concurrently. |
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916 * |
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917 * Because the thread that does the sync barrier has left the STS, it |
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918 * is possible to be suspended for a Full GC or an evacuation pause |
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919 * could occur. This is actually safe, since the entering the sync |
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920 * barrier is one of the last things do_marking_step() does, and it |
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921 * doesn't manipulate any data structures afterwards. |
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922 */ |
342 | 923 |
924 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
925 if (verbose_low()) | |
926 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); | |
927 | |
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928 if (concurrent()) { |
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929 ConcurrentGCThread::stsLeave(); |
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930 } |
342 | 931 _first_overflow_barrier_sync.enter(); |
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932 if (concurrent()) { |
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933 ConcurrentGCThread::stsJoin(); |
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934 } |
342 | 935 // at this point everyone should have synced up and not be doing any |
936 // more work | |
937 | |
938 if (verbose_low()) | |
939 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); | |
940 | |
941 // let task 0 do this | |
942 if (task_num == 0) { | |
943 // task 0 is responsible for clearing the global data structures | |
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944 // We should be here because of an overflow. During STW we should |
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945 // not clear the overflow flag since we rely on it being true when |
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946 // we exit this method to abort the pause and restart concurent |
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947 // marking. |
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948 clear_marking_state(concurrent() /* clear_overflow */); |
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949 force_overflow()->update(); |
342 | 950 |
951 if (PrintGC) { | |
952 gclog_or_tty->date_stamp(PrintGCDateStamps); | |
953 gclog_or_tty->stamp(PrintGCTimeStamps); | |
954 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
955 } | |
956 } | |
957 | |
958 // after this, each task should reset its own data structures then | |
959 // then go into the second barrier | |
960 } | |
961 | |
962 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
963 if (verbose_low()) | |
964 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); | |
965 | |
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966 if (concurrent()) { |
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967 ConcurrentGCThread::stsLeave(); |
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968 } |
342 | 969 _second_overflow_barrier_sync.enter(); |
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970 if (concurrent()) { |
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971 ConcurrentGCThread::stsJoin(); |
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972 } |
342 | 973 // at this point everything should be re-initialised and ready to go |
974 | |
975 if (verbose_low()) | |
976 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); | |
977 } | |
978 | |
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979 #ifndef PRODUCT |
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980 void ForceOverflowSettings::init() { |
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981 _num_remaining = G1ConcMarkForceOverflow; |
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982 _force = false; |
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983 update(); |
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984 } |
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985 |
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986 void ForceOverflowSettings::update() { |
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987 if (_num_remaining > 0) { |
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988 _num_remaining -= 1; |
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989 _force = true; |
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990 } else { |
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991 _force = false; |
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992 } |
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993 } |
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994 |
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995 bool ForceOverflowSettings::should_force() { |
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996 if (_force) { |
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997 _force = false; |
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998 return true; |
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999 } else { |
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1000 return false; |
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1001 } |
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1002 } |
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1003 #endif // !PRODUCT |
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1004 |
342 | 1005 void ConcurrentMark::grayRoot(oop p) { |
1006 HeapWord* addr = (HeapWord*) p; | |
1007 // We can't really check against _heap_start and _heap_end, since it | |
1008 // is possible during an evacuation pause with piggy-backed | |
1009 // initial-mark that the committed space is expanded during the | |
1010 // pause without CM observing this change. So the assertions below | |
1011 // is a bit conservative; but better than nothing. | |
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1012 assert(_g1h->g1_committed().contains(addr), |
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1013 "address should be within the heap bounds"); |
342 | 1014 |
1015 if (!_nextMarkBitMap->isMarked(addr)) | |
1016 _nextMarkBitMap->parMark(addr); | |
1017 } | |
1018 | |
1019 void ConcurrentMark::grayRegionIfNecessary(MemRegion mr) { | |
1020 // The objects on the region have already been marked "in bulk" by | |
1021 // the caller. We only need to decide whether to push the region on | |
1022 // the region stack or not. | |
1023 | |
1024 if (!concurrent_marking_in_progress() || !_should_gray_objects) | |
1025 // We're done with marking and waiting for remark. We do not need to | |
1026 // push anything else on the region stack. | |
1027 return; | |
1028 | |
1029 HeapWord* finger = _finger; | |
1030 | |
1031 if (verbose_low()) | |
1032 gclog_or_tty->print_cr("[global] attempting to push " | |
1033 "region ["PTR_FORMAT", "PTR_FORMAT"), finger is at " | |
1034 PTR_FORMAT, mr.start(), mr.end(), finger); | |
1035 | |
1036 if (mr.start() < finger) { | |
1037 // The finger is always heap region aligned and it is not possible | |
1038 // for mr to span heap regions. | |
1023
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1039 assert(mr.end() <= finger, "invariant"); |
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1040 |
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1041 // Separated the asserts so that we know which one fires. |
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1042 assert(mr.start() <= mr.end(), |
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1043 "region boundaries should fall within the committed space"); |
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1044 assert(_heap_start <= mr.start(), |
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1045 "region boundaries should fall within the committed space"); |
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1046 assert(mr.end() <= _heap_end, |
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1047 "region boundaries should fall within the committed space"); |
342 | 1048 if (verbose_low()) |
1049 gclog_or_tty->print_cr("[global] region ["PTR_FORMAT", "PTR_FORMAT") " | |
1050 "below the finger, pushing it", | |
1051 mr.start(), mr.end()); | |
1052 | |
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1053 if (!region_stack_push_lock_free(mr)) { |
342 | 1054 if (verbose_low()) |
1055 gclog_or_tty->print_cr("[global] region stack has overflown."); | |
1056 } | |
1057 } | |
1058 } | |
1059 | |
1060 void ConcurrentMark::markAndGrayObjectIfNecessary(oop p) { | |
1061 // The object is not marked by the caller. We need to at least mark | |
1062 // it and maybe push in on the stack. | |
1063 | |
1064 HeapWord* addr = (HeapWord*)p; | |
1065 if (!_nextMarkBitMap->isMarked(addr)) { | |
1066 // We definitely need to mark it, irrespective whether we bail out | |
1067 // because we're done with marking. | |
1068 if (_nextMarkBitMap->parMark(addr)) { | |
1069 if (!concurrent_marking_in_progress() || !_should_gray_objects) | |
1070 // If we're done with concurrent marking and we're waiting for | |
1071 // remark, then we're not pushing anything on the stack. | |
1072 return; | |
1073 | |
1074 // No OrderAccess:store_load() is needed. It is implicit in the | |
1075 // CAS done in parMark(addr) above | |
1076 HeapWord* finger = _finger; | |
1077 | |
1078 if (addr < finger) { | |
1079 if (!mark_stack_push(oop(addr))) { | |
1080 if (verbose_low()) | |
1081 gclog_or_tty->print_cr("[global] global stack overflow " | |
1082 "during parMark"); | |
1083 } | |
1084 } | |
1085 } | |
1086 } | |
1087 } | |
1088 | |
1089 class CMConcurrentMarkingTask: public AbstractGangTask { | |
1090 private: | |
1091 ConcurrentMark* _cm; | |
1092 ConcurrentMarkThread* _cmt; | |
1093 | |
1094 public: | |
1095 void work(int worker_i) { | |
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1096 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1097 "this should only be done by a conc GC thread"); |
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1098 ResourceMark rm; |
342 | 1099 |
1100 double start_vtime = os::elapsedVTime(); | |
1101 | |
1102 ConcurrentGCThread::stsJoin(); | |
1103 | |
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1104 assert((size_t) worker_i < _cm->active_tasks(), "invariant"); |
342 | 1105 CMTask* the_task = _cm->task(worker_i); |
1106 the_task->record_start_time(); | |
1107 if (!_cm->has_aborted()) { | |
1108 do { | |
1109 double start_vtime_sec = os::elapsedVTime(); | |
1110 double start_time_sec = os::elapsedTime(); | |
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1111 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1112 |
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1113 the_task->do_marking_step(mark_step_duration_ms, |
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1114 true /* do_stealing */, |
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1115 true /* do_termination */); |
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1116 |
342 | 1117 double end_time_sec = os::elapsedTime(); |
1118 double end_vtime_sec = os::elapsedVTime(); | |
1119 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1120 double elapsed_time_sec = end_time_sec - start_time_sec; | |
1121 _cm->clear_has_overflown(); | |
1122 | |
1123 bool ret = _cm->do_yield_check(worker_i); | |
1124 | |
1125 jlong sleep_time_ms; | |
1126 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1127 sleep_time_ms = | |
1128 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
1129 ConcurrentGCThread::stsLeave(); | |
1130 os::sleep(Thread::current(), sleep_time_ms, false); | |
1131 ConcurrentGCThread::stsJoin(); | |
1132 } | |
1133 double end_time2_sec = os::elapsedTime(); | |
1134 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
1135 | |
1136 #if 0 | |
1137 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
1138 "overhead %1.4lf", | |
1139 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
1140 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
1141 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
1142 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
1143 #endif | |
1144 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1145 } | |
1146 the_task->record_end_time(); | |
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1147 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1148 |
1149 ConcurrentGCThread::stsLeave(); | |
1150 | |
1151 double end_vtime = os::elapsedVTime(); | |
1152 _cm->update_accum_task_vtime(worker_i, end_vtime - start_vtime); | |
1153 } | |
1154 | |
1155 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1156 ConcurrentMarkThread* cmt) : | |
1157 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1158 | |
1159 ~CMConcurrentMarkingTask() { } | |
1160 }; | |
1161 | |
1162 void ConcurrentMark::markFromRoots() { | |
1163 // we might be tempted to assert that: | |
1164 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1165 // "inconsistent argument?"); | |
1166 // However that wouldn't be right, because it's possible that | |
1167 // a safepoint is indeed in progress as a younger generation | |
1168 // stop-the-world GC happens even as we mark in this generation. | |
1169 | |
1170 _restart_for_overflow = false; | |
1171 | |
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1172 size_t active_workers = MAX2((size_t) 1, parallel_marking_threads()); |
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1173 force_overflow_conc()->init(); |
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1174 set_phase(active_workers, true /* concurrent */); |
342 | 1175 |
1176 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
1177 if (parallel_marking_threads() > 0) | |
1178 _parallel_workers->run_task(&markingTask); | |
1179 else | |
1180 markingTask.work(0); | |
1181 print_stats(); | |
1182 } | |
1183 | |
1184 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1185 // world is stopped at this checkpoint | |
1186 assert(SafepointSynchronize::is_at_safepoint(), | |
1187 "world should be stopped"); | |
1188 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1189 | |
1190 // If a full collection has happened, we shouldn't do this. | |
1191 if (has_aborted()) { | |
1192 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1193 return; | |
1194 } | |
1195 | |
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1196 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1197 |
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1198 if (VerifyDuringGC) { |
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1199 HandleMark hm; // handle scope |
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1200 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1201 Universe::heap()->prepare_for_verify(); |
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1202 Universe::verify(true, false, true); |
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1203 } |
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1204 |
342 | 1205 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1206 g1p->record_concurrent_mark_remark_start(); | |
1207 | |
1208 double start = os::elapsedTime(); | |
1209 | |
1210 checkpointRootsFinalWork(); | |
1211 | |
1212 double mark_work_end = os::elapsedTime(); | |
1213 | |
1214 weakRefsWork(clear_all_soft_refs); | |
1215 | |
1216 if (has_overflown()) { | |
1217 // Oops. We overflowed. Restart concurrent marking. | |
1218 _restart_for_overflow = true; | |
1219 // Clear the flag. We do not need it any more. | |
1220 clear_has_overflown(); | |
1221 if (G1TraceMarkStackOverflow) | |
1222 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); | |
1223 } else { | |
2149 | 1224 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1225 // We're done with marking. |
1317
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1226 // This is the end of the marking cycle, we're expected all |
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1227 // threads to have SATB queues with active set to true. |
2149 | 1228 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1229 true /* expected_active */); | |
811 | 1230 |
1231 if (VerifyDuringGC) { | |
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1232 HandleMark hm; // handle scope |
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1233 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1234 Universe::heap()->prepare_for_verify(); |
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1235 Universe::heap()->verify(/* allow_dirty */ true, |
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1236 /* silent */ false, |
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1237 /* use_prev_marking */ false); |
811 | 1238 } |
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1239 assert(!restart_for_overflow(), "sanity"); |
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1240 } |
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1241 |
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1242 // Reset the marking state if marking completed |
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1243 if (!restart_for_overflow()) { |
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1244 set_non_marking_state(); |
342 | 1245 } |
1246 | |
1247 #if VERIFY_OBJS_PROCESSED | |
1248 _scan_obj_cl.objs_processed = 0; | |
1249 ThreadLocalObjQueue::objs_enqueued = 0; | |
1250 #endif | |
1251 | |
1252 // Statistics | |
1253 double now = os::elapsedTime(); | |
1254 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1255 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1256 _remark_times.add((now - start) * 1000.0); | |
1257 | |
1258 g1p->record_concurrent_mark_remark_end(); | |
1259 } | |
1260 | |
1261 #define CARD_BM_TEST_MODE 0 | |
1262 | |
1263 class CalcLiveObjectsClosure: public HeapRegionClosure { | |
1264 | |
1265 CMBitMapRO* _bm; | |
1266 ConcurrentMark* _cm; | |
1267 bool _changed; | |
1268 bool _yield; | |
1269 size_t _words_done; | |
1270 size_t _tot_live; | |
1271 size_t _tot_used; | |
1272 size_t _regions_done; | |
1273 double _start_vtime_sec; | |
1274 | |
1275 BitMap* _region_bm; | |
1276 BitMap* _card_bm; | |
1277 intptr_t _bottom_card_num; | |
1278 bool _final; | |
1279 | |
1280 void mark_card_num_range(intptr_t start_card_num, intptr_t last_card_num) { | |
1281 for (intptr_t i = start_card_num; i <= last_card_num; i++) { | |
1282 #if CARD_BM_TEST_MODE | |
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1283 guarantee(_card_bm->at(i - _bottom_card_num), "Should already be set."); |
342 | 1284 #else |
1285 _card_bm->par_at_put(i - _bottom_card_num, 1); | |
1286 #endif | |
1287 } | |
1288 } | |
1289 | |
1290 public: | |
1291 CalcLiveObjectsClosure(bool final, | |
1292 CMBitMapRO *bm, ConcurrentMark *cm, | |
936 | 1293 BitMap* region_bm, BitMap* card_bm) : |
342 | 1294 _bm(bm), _cm(cm), _changed(false), _yield(true), |
1295 _words_done(0), _tot_live(0), _tot_used(0), | |
936 | 1296 _region_bm(region_bm), _card_bm(card_bm),_final(final), |
342 | 1297 _regions_done(0), _start_vtime_sec(0.0) |
1298 { | |
1299 _bottom_card_num = | |
1300 intptr_t(uintptr_t(G1CollectedHeap::heap()->reserved_region().start()) >> | |
1301 CardTableModRefBS::card_shift); | |
1302 } | |
1303 | |
829 | 1304 // It takes a region that's not empty (i.e., it has at least one |
1305 // live object in it and sets its corresponding bit on the region | |
1306 // bitmap to 1. If the region is "starts humongous" it will also set | |
1307 // to 1 the bits on the region bitmap that correspond to its | |
1308 // associated "continues humongous" regions. | |
1309 void set_bit_for_region(HeapRegion* hr) { | |
1310 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1311 | |
1312 size_t index = hr->hrs_index(); | |
1313 if (!hr->startsHumongous()) { | |
1314 // Normal (non-humongous) case: just set the bit. | |
1315 _region_bm->par_at_put((BitMap::idx_t) index, true); | |
1316 } else { | |
1317 // Starts humongous case: calculate how many regions are part of | |
1318 // this humongous region and then set the bit range. It might | |
1319 // have been a bit more efficient to look at the object that | |
1320 // spans these humongous regions to calculate their number from | |
1321 // the object's size. However, it's a good idea to calculate | |
1322 // this based on the metadata itself, and not the region | |
1323 // contents, so that this code is not aware of what goes into | |
1324 // the humongous regions (in case this changes in the future). | |
1325 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1326 size_t end_index = index + 1; | |
831 | 1327 while (end_index < g1h->n_regions()) { |
1328 HeapRegion* chr = g1h->region_at(end_index); | |
829 | 1329 if (!chr->continuesHumongous()) { |
1330 break; | |
1331 } | |
1332 end_index += 1; | |
1333 } | |
1334 _region_bm->par_at_put_range((BitMap::idx_t) index, | |
1335 (BitMap::idx_t) end_index, true); | |
1336 } | |
1337 } | |
1338 | |
342 | 1339 bool doHeapRegion(HeapRegion* hr) { |
1340 if (!_final && _regions_done == 0) | |
1341 _start_vtime_sec = os::elapsedVTime(); | |
1342 | |
639 | 1343 if (hr->continuesHumongous()) { |
829 | 1344 // We will ignore these here and process them when their |
1345 // associated "starts humongous" region is processed (see | |
1346 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1347 // associated "starts humongous" region to have their bit set to | |
1348 // 1 since, due to the region chunking in the parallel region | |
1349 // iteration, a "continues humongous" region might be visited | |
1350 // before its associated "starts humongous". | |
639 | 1351 return false; |
1352 } | |
342 | 1353 |
1354 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
1355 HeapWord* start = hr->top_at_conc_mark_count(); | |
1356 assert(hr->bottom() <= start && start <= hr->end() && | |
1357 hr->bottom() <= nextTop && nextTop <= hr->end() && | |
1358 start <= nextTop, | |
1359 "Preconditions."); | |
1360 // Otherwise, record the number of word's we'll examine. | |
1361 size_t words_done = (nextTop - start); | |
1362 // Find the first marked object at or after "start". | |
1363 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
1364 size_t marked_bytes = 0; | |
1365 | |
1366 // Below, the term "card num" means the result of shifting an address | |
1367 // by the card shift -- address 0 corresponds to card number 0. One | |
1368 // must subtract the card num of the bottom of the heap to obtain a | |
1369 // card table index. | |
1370 // The first card num of the sequence of live cards currently being | |
1371 // constructed. -1 ==> no sequence. | |
1372 intptr_t start_card_num = -1; | |
1373 // The last card num of the sequence of live cards currently being | |
1374 // constructed. -1 ==> no sequence. | |
1375 intptr_t last_card_num = -1; | |
1376 | |
1377 while (start < nextTop) { | |
1378 if (_yield && _cm->do_yield_check()) { | |
1379 // We yielded. It might be for a full collection, in which case | |
1380 // all bets are off; terminate the traversal. | |
1381 if (_cm->has_aborted()) { | |
1382 _changed = false; | |
1383 return true; | |
1384 } else { | |
1385 // Otherwise, it might be a collection pause, and the region | |
1386 // we're looking at might be in the collection set. We'll | |
1387 // abandon this region. | |
1388 return false; | |
1389 } | |
1390 } | |
1391 oop obj = oop(start); | |
1392 int obj_sz = obj->size(); | |
1393 // The card num of the start of the current object. | |
1394 intptr_t obj_card_num = | |
1395 intptr_t(uintptr_t(start) >> CardTableModRefBS::card_shift); | |
1396 | |
1397 HeapWord* obj_last = start + obj_sz - 1; | |
1398 intptr_t obj_last_card_num = | |
1399 intptr_t(uintptr_t(obj_last) >> CardTableModRefBS::card_shift); | |
1400 | |
1401 if (obj_card_num != last_card_num) { | |
1402 if (start_card_num == -1) { | |
1403 assert(last_card_num == -1, "Both or neither."); | |
1404 start_card_num = obj_card_num; | |
1405 } else { | |
1406 assert(last_card_num != -1, "Both or neither."); | |
1407 assert(obj_card_num >= last_card_num, "Inv"); | |
1408 if ((obj_card_num - last_card_num) > 1) { | |
1409 // Mark the last run, and start a new one. | |
1410 mark_card_num_range(start_card_num, last_card_num); | |
1411 start_card_num = obj_card_num; | |
1412 } | |
1413 } | |
1414 #if CARD_BM_TEST_MODE | |
1415 /* | |
1416 gclog_or_tty->print_cr("Setting bits from %d/%d.", | |
1417 obj_card_num - _bottom_card_num, | |
1418 obj_last_card_num - _bottom_card_num); | |
1419 */ | |
1420 for (intptr_t j = obj_card_num; j <= obj_last_card_num; j++) { | |
1421 _card_bm->par_at_put(j - _bottom_card_num, 1); | |
1422 } | |
1423 #endif | |
1424 } | |
1425 // In any case, we set the last card num. | |
1426 last_card_num = obj_last_card_num; | |
1427 | |
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1428 marked_bytes += (size_t)obj_sz * HeapWordSize; |
342 | 1429 // Find the next marked object after this one. |
1430 start = _bm->getNextMarkedWordAddress(start + 1, nextTop); | |
1431 _changed = true; | |
1432 } | |
1433 // Handle the last range, if any. | |
1434 if (start_card_num != -1) | |
1435 mark_card_num_range(start_card_num, last_card_num); | |
1436 if (_final) { | |
1437 // Mark the allocated-since-marking portion... | |
1438 HeapWord* tp = hr->top(); | |
1439 if (nextTop < tp) { | |
1440 start_card_num = | |
1441 intptr_t(uintptr_t(nextTop) >> CardTableModRefBS::card_shift); | |
1442 last_card_num = | |
1443 intptr_t(uintptr_t(tp) >> CardTableModRefBS::card_shift); | |
1444 mark_card_num_range(start_card_num, last_card_num); | |
1445 // This definitely means the region has live objects. | |
829 | 1446 set_bit_for_region(hr); |
342 | 1447 } |
1448 } | |
1449 | |
1450 hr->add_to_marked_bytes(marked_bytes); | |
1451 // Update the live region bitmap. | |
1452 if (marked_bytes > 0) { | |
829 | 1453 set_bit_for_region(hr); |
342 | 1454 } |
1455 hr->set_top_at_conc_mark_count(nextTop); | |
1456 _tot_live += hr->next_live_bytes(); | |
1457 _tot_used += hr->used(); | |
1458 _words_done = words_done; | |
1459 | |
1460 if (!_final) { | |
1461 ++_regions_done; | |
1462 if (_regions_done % 10 == 0) { | |
1463 double end_vtime_sec = os::elapsedVTime(); | |
1464 double elapsed_vtime_sec = end_vtime_sec - _start_vtime_sec; | |
1465 if (elapsed_vtime_sec > (10.0 / 1000.0)) { | |
1466 jlong sleep_time_ms = | |
1467 (jlong) (elapsed_vtime_sec * _cm->cleanup_sleep_factor() * 1000.0); | |
1468 os::sleep(Thread::current(), sleep_time_ms, false); | |
1469 _start_vtime_sec = end_vtime_sec; | |
1470 } | |
1471 } | |
1472 } | |
1473 | |
1474 return false; | |
1475 } | |
1476 | |
1477 bool changed() { return _changed; } | |
1478 void reset() { _changed = false; _words_done = 0; } | |
1479 void no_yield() { _yield = false; } | |
1480 size_t words_done() { return _words_done; } | |
1481 size_t tot_live() { return _tot_live; } | |
1482 size_t tot_used() { return _tot_used; } | |
1483 }; | |
1484 | |
1485 | |
1486 void ConcurrentMark::calcDesiredRegions() { | |
1487 _region_bm.clear(); | |
1488 _card_bm.clear(); | |
1489 CalcLiveObjectsClosure calccl(false /*final*/, | |
1490 nextMarkBitMap(), this, | |
936 | 1491 &_region_bm, &_card_bm); |
342 | 1492 G1CollectedHeap *g1h = G1CollectedHeap::heap(); |
1493 g1h->heap_region_iterate(&calccl); | |
1494 | |
1495 do { | |
1496 calccl.reset(); | |
1497 g1h->heap_region_iterate(&calccl); | |
1498 } while (calccl.changed()); | |
1499 } | |
1500 | |
1501 class G1ParFinalCountTask: public AbstractGangTask { | |
1502 protected: | |
1503 G1CollectedHeap* _g1h; | |
1504 CMBitMap* _bm; | |
1505 size_t _n_workers; | |
1506 size_t *_live_bytes; | |
1507 size_t *_used_bytes; | |
1508 BitMap* _region_bm; | |
1509 BitMap* _card_bm; | |
1510 public: | |
1511 G1ParFinalCountTask(G1CollectedHeap* g1h, CMBitMap* bm, | |
1512 BitMap* region_bm, BitMap* card_bm) : | |
1513 AbstractGangTask("G1 final counting"), _g1h(g1h), | |
1514 _bm(bm), _region_bm(region_bm), _card_bm(card_bm) | |
1515 { | |
1516 if (ParallelGCThreads > 0) | |
1517 _n_workers = _g1h->workers()->total_workers(); | |
1518 else | |
1519 _n_workers = 1; | |
1520 _live_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
1521 _used_bytes = NEW_C_HEAP_ARRAY(size_t, _n_workers); | |
1522 } | |
1523 | |
1524 ~G1ParFinalCountTask() { | |
1525 FREE_C_HEAP_ARRAY(size_t, _live_bytes); | |
1526 FREE_C_HEAP_ARRAY(size_t, _used_bytes); | |
1527 } | |
1528 | |
1529 void work(int i) { | |
1530 CalcLiveObjectsClosure calccl(true /*final*/, | |
1531 _bm, _g1h->concurrent_mark(), | |
936 | 1532 _region_bm, _card_bm); |
342 | 1533 calccl.no_yield(); |
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1534 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1535 _g1h->heap_region_par_iterate_chunked(&calccl, i, |
1536 HeapRegion::FinalCountClaimValue); | |
342 | 1537 } else { |
1538 _g1h->heap_region_iterate(&calccl); | |
1539 } | |
1540 assert(calccl.complete(), "Shouldn't have yielded!"); | |
1541 | |
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1542 assert((size_t) i < _n_workers, "invariant"); |
342 | 1543 _live_bytes[i] = calccl.tot_live(); |
1544 _used_bytes[i] = calccl.tot_used(); | |
1545 } | |
1546 size_t live_bytes() { | |
1547 size_t live_bytes = 0; | |
1548 for (size_t i = 0; i < _n_workers; ++i) | |
1549 live_bytes += _live_bytes[i]; | |
1550 return live_bytes; | |
1551 } | |
1552 size_t used_bytes() { | |
1553 size_t used_bytes = 0; | |
1554 for (size_t i = 0; i < _n_workers; ++i) | |
1555 used_bytes += _used_bytes[i]; | |
1556 return used_bytes; | |
1557 } | |
1558 }; | |
1559 | |
1560 class G1ParNoteEndTask; | |
1561 | |
1562 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1563 G1CollectedHeap* _g1; | |
1564 int _worker_num; | |
1565 size_t _max_live_bytes; | |
1566 size_t _regions_claimed; | |
1567 size_t _freed_bytes; | |
2173 | 1568 FreeRegionList* _local_cleanup_list; |
1569 HumongousRegionSet* _humongous_proxy_set; | |
1570 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1571 double _claimed_region_time; |
1572 double _max_region_time; | |
1573 | |
1574 public: | |
1575 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1576 int worker_num, |
1577 FreeRegionList* local_cleanup_list, | |
1578 HumongousRegionSet* humongous_proxy_set, | |
1579 HRRSCleanupTask* hrrs_cleanup_task); | |
342 | 1580 size_t freed_bytes() { return _freed_bytes; } |
1581 | |
1582 bool doHeapRegion(HeapRegion *r); | |
1583 | |
1584 size_t max_live_bytes() { return _max_live_bytes; } | |
1585 size_t regions_claimed() { return _regions_claimed; } | |
1586 double claimed_region_time_sec() { return _claimed_region_time; } | |
1587 double max_region_time_sec() { return _max_region_time; } | |
1588 }; | |
1589 | |
1590 class G1ParNoteEndTask: public AbstractGangTask { | |
1591 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1592 |
342 | 1593 protected: |
1594 G1CollectedHeap* _g1h; | |
1595 size_t _max_live_bytes; | |
1596 size_t _freed_bytes; | |
2152 | 1597 FreeRegionList* _cleanup_list; |
1598 | |
342 | 1599 public: |
1600 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1601 FreeRegionList* cleanup_list) : |
342 | 1602 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1603 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1604 |
1605 void work(int i) { | |
1606 double start = os::elapsedTime(); | |
2173 | 1607 FreeRegionList local_cleanup_list("Local Cleanup List"); |
1608 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); | |
1609 HRRSCleanupTask hrrs_cleanup_task; | |
1610 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, i, &local_cleanup_list, | |
1611 &humongous_proxy_set, | |
1612 &hrrs_cleanup_task); | |
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1613 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1614 _g1h->heap_region_par_iterate_chunked(&g1_note_end, i, |
1615 HeapRegion::NoteEndClaimValue); | |
342 | 1616 } else { |
1617 _g1h->heap_region_iterate(&g1_note_end); | |
1618 } | |
1619 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1620 | |
2152 | 1621 // Now update the lists |
1622 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1623 NULL /* free_list */, | |
2173 | 1624 &humongous_proxy_set, |
2152 | 1625 true /* par */); |
342 | 1626 { |
1627 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1628 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1629 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1630 |
2173 | 1631 _cleanup_list->add_as_tail(&local_cleanup_list); |
1632 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1633 | |
1634 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1635 } |
1636 double end = os::elapsedTime(); | |
1637 if (G1PrintParCleanupStats) { | |
1638 gclog_or_tty->print(" Worker thread %d [%8.3f..%8.3f = %8.3f ms] " | |
1639 "claimed %d regions (tot = %8.3f ms, max = %8.3f ms).\n", | |
1640 i, start, end, (end-start)*1000.0, | |
1641 g1_note_end.regions_claimed(), | |
1642 g1_note_end.claimed_region_time_sec()*1000.0, | |
1643 g1_note_end.max_region_time_sec()*1000.0); | |
1644 } | |
1645 } | |
1646 size_t max_live_bytes() { return _max_live_bytes; } | |
1647 size_t freed_bytes() { return _freed_bytes; } | |
1648 }; | |
1649 | |
1650 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1651 protected: | |
1652 G1RemSet* _g1rs; | |
1653 BitMap* _region_bm; | |
1654 BitMap* _card_bm; | |
1655 public: | |
1656 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1657 BitMap* region_bm, BitMap* card_bm) : | |
1658 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
1659 _region_bm(region_bm), _card_bm(card_bm) | |
1660 {} | |
1661 | |
1662 void work(int i) { | |
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1663 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1664 _g1rs->scrub_par(_region_bm, _card_bm, i, |
1665 HeapRegion::ScrubRemSetClaimValue); | |
342 | 1666 } else { |
1667 _g1rs->scrub(_region_bm, _card_bm); | |
1668 } | |
1669 } | |
1670 | |
1671 }; | |
1672 | |
1673 G1NoteEndOfConcMarkClosure:: | |
1674 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1675 int worker_num, |
1676 FreeRegionList* local_cleanup_list, | |
1677 HumongousRegionSet* humongous_proxy_set, | |
1678 HRRSCleanupTask* hrrs_cleanup_task) | |
342 | 1679 : _g1(g1), _worker_num(worker_num), |
1680 _max_live_bytes(0), _regions_claimed(0), | |
2152 | 1681 _freed_bytes(0), |
342 | 1682 _claimed_region_time(0.0), _max_region_time(0.0), |
2173 | 1683 _local_cleanup_list(local_cleanup_list), |
1684 _humongous_proxy_set(humongous_proxy_set), | |
1685 _hrrs_cleanup_task(hrrs_cleanup_task) { } | |
2152 | 1686 |
1687 bool G1NoteEndOfConcMarkClosure::doHeapRegion(HeapRegion *hr) { | |
342 | 1688 // We use a claim value of zero here because all regions |
1689 // were claimed with value 1 in the FinalCount task. | |
2152 | 1690 hr->reset_gc_time_stamp(); |
1691 if (!hr->continuesHumongous()) { | |
342 | 1692 double start = os::elapsedTime(); |
1693 _regions_claimed++; | |
2152 | 1694 hr->note_end_of_marking(); |
1695 _max_live_bytes += hr->max_live_bytes(); | |
2173 | 1696 _g1->free_region_if_empty(hr, |
1697 &_freed_bytes, | |
1698 _local_cleanup_list, | |
1699 _humongous_proxy_set, | |
1700 _hrrs_cleanup_task, | |
1701 true /* par */); | |
342 | 1702 double region_time = (os::elapsedTime() - start); |
1703 _claimed_region_time += region_time; | |
1704 if (region_time > _max_region_time) _max_region_time = region_time; | |
1705 } | |
1706 return false; | |
1707 } | |
1708 | |
1709 void ConcurrentMark::cleanup() { | |
1710 // world is stopped at this checkpoint | |
1711 assert(SafepointSynchronize::is_at_safepoint(), | |
1712 "world should be stopped"); | |
1713 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1714 | |
1715 // If a full collection has happened, we shouldn't do this. | |
1716 if (has_aborted()) { | |
1717 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1718 return; | |
1719 } | |
1720 | |
2152 | 1721 g1h->verify_region_sets_optional(); |
1722 | |
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1723 if (VerifyDuringGC) { |
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1724 HandleMark hm; // handle scope |
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1725 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1726 Universe::heap()->prepare_for_verify(); |
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1727 Universe::verify(/* allow dirty */ true, |
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1728 /* silent */ false, |
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1729 /* prev marking */ true); |
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1730 } |
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1731 |
342 | 1732 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1733 g1p->record_concurrent_mark_cleanup_start(); | |
1734 | |
1735 double start = os::elapsedTime(); | |
1736 | |
2173 | 1737 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1738 | |
342 | 1739 // Do counting once more with the world stopped for good measure. |
1740 G1ParFinalCountTask g1_par_count_task(g1h, nextMarkBitMap(), | |
1741 &_region_bm, &_card_bm); | |
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1742 if (G1CollectedHeap::use_parallel_gc_threads()) { |
355 | 1743 assert(g1h->check_heap_region_claim_values( |
1744 HeapRegion::InitialClaimValue), | |
1745 "sanity check"); | |
1746 | |
342 | 1747 int n_workers = g1h->workers()->total_workers(); |
1748 g1h->set_par_threads(n_workers); | |
1749 g1h->workers()->run_task(&g1_par_count_task); | |
1750 g1h->set_par_threads(0); | |
355 | 1751 |
1752 assert(g1h->check_heap_region_claim_values( | |
1753 HeapRegion::FinalCountClaimValue), | |
1754 "sanity check"); | |
342 | 1755 } else { |
1756 g1_par_count_task.work(0); | |
1757 } | |
1758 | |
1759 size_t known_garbage_bytes = | |
1760 g1_par_count_task.used_bytes() - g1_par_count_task.live_bytes(); | |
1761 #if 0 | |
1762 gclog_or_tty->print_cr("used %1.2lf, live %1.2lf, garbage %1.2lf", | |
1763 (double) g1_par_count_task.used_bytes() / (double) (1024 * 1024), | |
1764 (double) g1_par_count_task.live_bytes() / (double) (1024 * 1024), | |
1765 (double) known_garbage_bytes / (double) (1024 * 1024)); | |
1766 #endif // 0 | |
1767 g1p->set_known_garbage_bytes(known_garbage_bytes); | |
1768 | |
1769 size_t start_used_bytes = g1h->used(); | |
1770 _at_least_one_mark_complete = true; | |
1771 g1h->set_marking_complete(); | |
1772 | |
1773 double count_end = os::elapsedTime(); | |
1774 double this_final_counting_time = (count_end - start); | |
1775 if (G1PrintParCleanupStats) { | |
1776 gclog_or_tty->print_cr("Cleanup:"); | |
1777 gclog_or_tty->print_cr(" Finalize counting: %8.3f ms", | |
1778 this_final_counting_time*1000.0); | |
1779 } | |
1780 _total_counting_time += this_final_counting_time; | |
1781 | |
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1782 if (G1PrintRegionLivenessInfo) { |
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1783 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1784 _g1h->heap_region_iterate(&cl); |
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1785 } |
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1786 |
342 | 1787 // Install newly created mark bitMap as "prev". |
1788 swapMarkBitMaps(); | |
1789 | |
1790 g1h->reset_gc_time_stamp(); | |
1791 | |
1792 // Note end of marking in all heap regions. | |
1793 double note_end_start = os::elapsedTime(); | |
2152 | 1794 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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1795 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1796 int n_workers = g1h->workers()->total_workers(); |
1797 g1h->set_par_threads(n_workers); | |
1798 g1h->workers()->run_task(&g1_par_note_end_task); | |
1799 g1h->set_par_threads(0); | |
355 | 1800 |
1801 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
1802 "sanity check"); | |
342 | 1803 } else { |
1804 g1_par_note_end_task.work(0); | |
1805 } | |
2152 | 1806 |
1807 if (!cleanup_list_is_empty()) { | |
1808 // The cleanup list is not empty, so we'll have to process it | |
1809 // concurrently. Notify anyone else that might be wanting free | |
1810 // regions that there will be more free regions coming soon. | |
1811 g1h->set_free_regions_coming(); | |
1812 } | |
342 | 1813 double note_end_end = os::elapsedTime(); |
1814 if (G1PrintParCleanupStats) { | |
1815 gclog_or_tty->print_cr(" note end of marking: %8.3f ms.", | |
1816 (note_end_end - note_end_start)*1000.0); | |
1817 } | |
1818 | |
355 | 1819 |
342 | 1820 // call below, since it affects the metric by which we sort the heap |
1821 // regions. | |
1822 if (G1ScrubRemSets) { | |
1823 double rs_scrub_start = os::elapsedTime(); | |
1824 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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1825 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1826 int n_workers = g1h->workers()->total_workers(); |
1827 g1h->set_par_threads(n_workers); | |
1828 g1h->workers()->run_task(&g1_par_scrub_rs_task); | |
1829 g1h->set_par_threads(0); | |
355 | 1830 |
1831 assert(g1h->check_heap_region_claim_values( | |
1832 HeapRegion::ScrubRemSetClaimValue), | |
1833 "sanity check"); | |
342 | 1834 } else { |
1835 g1_par_scrub_rs_task.work(0); | |
1836 } | |
1837 | |
1838 double rs_scrub_end = os::elapsedTime(); | |
1839 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
1840 _total_rs_scrub_time += this_rs_scrub_time; | |
1841 } | |
1842 | |
1843 // this will also free any regions totally full of garbage objects, | |
1844 // and sort the regions. | |
1845 g1h->g1_policy()->record_concurrent_mark_cleanup_end( | |
1846 g1_par_note_end_task.freed_bytes(), | |
1847 g1_par_note_end_task.max_live_bytes()); | |
1848 | |
1849 // Statistics. | |
1850 double end = os::elapsedTime(); | |
1851 _cleanup_times.add((end - start) * 1000.0); | |
1852 | |
1853 // G1CollectedHeap::heap()->print(); | |
1854 // gclog_or_tty->print_cr("HEAP GC TIME STAMP : %d", | |
1855 // G1CollectedHeap::heap()->get_gc_time_stamp()); | |
1856 | |
1857 if (PrintGC || PrintGCDetails) { | |
1858 g1h->print_size_transition(gclog_or_tty, | |
1859 start_used_bytes, | |
1860 g1h->used(), | |
1861 g1h->capacity()); | |
1862 } | |
1863 | |
1864 size_t cleaned_up_bytes = start_used_bytes - g1h->used(); | |
1865 g1p->decrease_known_garbage_bytes(cleaned_up_bytes); | |
1866 | |
1867 // We need to make this be a "collection" so any collection pause that | |
1868 // races with it goes around and waits for completeCleanup to finish. | |
1869 g1h->increment_total_collections(); | |
1870 | |
751 | 1871 if (VerifyDuringGC) { |
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1872 HandleMark hm; // handle scope |
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1873 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1874 Universe::heap()->prepare_for_verify(); |
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1875 Universe::verify(/* allow dirty */ true, |
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1876 /* silent */ false, |
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1877 /* prev marking */ true); |
342 | 1878 } |
2152 | 1879 |
1880 g1h->verify_region_sets_optional(); | |
342 | 1881 } |
1882 | |
1883 void ConcurrentMark::completeCleanup() { | |
1884 if (has_aborted()) return; | |
1885 | |
2152 | 1886 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1887 | |
1888 _cleanup_list.verify_optional(); | |
2361 | 1889 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 1890 |
1891 if (G1ConcRegionFreeingVerbose) { | |
1892 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
1893 "cleanup list has "SIZE_FORMAT" entries", | |
1894 _cleanup_list.length()); | |
1895 } | |
1896 | |
1897 // Noone else should be accessing the _cleanup_list at this point, | |
1898 // so it's not necessary to take any locks | |
1899 while (!_cleanup_list.is_empty()) { | |
1900 HeapRegion* hr = _cleanup_list.remove_head(); | |
1901 assert(hr != NULL, "the list was not empty"); | |
1902 hr->rem_set()->clear(); | |
2361 | 1903 tmp_free_list.add_as_tail(hr); |
2152 | 1904 |
1905 // Instead of adding one region at a time to the secondary_free_list, | |
1906 // we accumulate them in the local list and move them a few at a | |
1907 // time. This also cuts down on the number of notify_all() calls | |
1908 // we do during this process. We'll also append the local list when | |
1909 // _cleanup_list is empty (which means we just removed the last | |
1910 // region from the _cleanup_list). | |
2361 | 1911 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 1912 _cleanup_list.is_empty()) { |
1913 if (G1ConcRegionFreeingVerbose) { | |
1914 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
1915 "appending "SIZE_FORMAT" entries to the " | |
1916 "secondary_free_list, clean list still has " | |
1917 SIZE_FORMAT" entries", | |
2361 | 1918 tmp_free_list.length(), |
2152 | 1919 _cleanup_list.length()); |
342 | 1920 } |
2152 | 1921 |
1922 { | |
1923 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 1924 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 1925 SecondaryFreeList_lock->notify_all(); |
1926 } | |
1927 | |
1928 if (G1StressConcRegionFreeing) { | |
1929 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
1930 os::sleep(Thread::current(), (jlong) 1, false); | |
1931 } | |
1932 } | |
342 | 1933 } |
1934 } | |
2361 | 1935 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 1936 } |
1937 | |
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1938 // Support closures for reference procssing in G1 |
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1939 |
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1940 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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1941 HeapWord* addr = (HeapWord*)obj; |
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1942 return addr != NULL && |
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1943 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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1944 } |
342 | 1945 |
1946 class G1CMKeepAliveClosure: public OopClosure { | |
1947 G1CollectedHeap* _g1; | |
1948 ConcurrentMark* _cm; | |
1949 CMBitMap* _bitMap; | |
1950 public: | |
1951 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm, | |
1952 CMBitMap* bitMap) : | |
1953 _g1(g1), _cm(cm), | |
1954 _bitMap(bitMap) {} | |
1955 | |
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1956 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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1957 virtual void do_oop( oop* p) { do_oop_work(p); } |
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1958 |
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1959 template <class T> void do_oop_work(T* p) { |
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1960 oop obj = oopDesc::load_decode_heap_oop(p); |
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1961 HeapWord* addr = (HeapWord*)obj; |
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1962 |
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1963 if (_cm->verbose_high()) |
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1964 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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1965 "*"PTR_FORMAT" = "PTR_FORMAT, |
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1966 p, (void*) obj); |
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1967 |
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1968 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
342 | 1969 _bitMap->mark(addr); |
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1970 _cm->mark_stack_push(obj); |
342 | 1971 } |
1972 } | |
1973 }; | |
1974 | |
1975 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
1976 CMMarkStack* _markStack; | |
1977 CMBitMap* _bitMap; | |
1978 G1CMKeepAliveClosure* _oopClosure; | |
1979 public: | |
1980 G1CMDrainMarkingStackClosure(CMBitMap* bitMap, CMMarkStack* markStack, | |
1981 G1CMKeepAliveClosure* oopClosure) : | |
1982 _bitMap(bitMap), | |
1983 _markStack(markStack), | |
1984 _oopClosure(oopClosure) | |
1985 {} | |
1986 | |
1987 void do_void() { | |
1988 _markStack->drain((OopClosure*)_oopClosure, _bitMap, false); | |
1989 } | |
1990 }; | |
1991 | |
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1992 // 'Keep Alive' closure used by parallel reference processing. |
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1993 // An instance of this closure is used in the parallel reference processing |
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1994 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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1995 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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1996 // placed on to discovered ref lists once so we can mark and push with no |
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1997 // need to check whether the object has already been marked. Using the |
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1998 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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1999 // operating on the global mark stack. This means that an individual |
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2000 // worker would be doing lock-free pushes while it processes its own |
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2001 // discovered ref list followed by drain call. If the discovered ref lists |
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2002 // are unbalanced then this could cause interference with the other |
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2003 // workers. Using a CMTask (and its embedded local data structures) |
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2004 // avoids that potential interference. |
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2005 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2006 ConcurrentMark* _cm; |
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2007 CMTask* _task; |
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2008 CMBitMap* _bitMap; |
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2009 int _ref_counter_limit; |
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2010 int _ref_counter; |
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2011 public: |
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2012 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, |
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2013 CMTask* task, |
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2014 CMBitMap* bitMap) : |
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2015 _cm(cm), _task(task), _bitMap(bitMap), |
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2016 _ref_counter_limit(G1RefProcDrainInterval) |
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2017 { |
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2018 assert(_ref_counter_limit > 0, "sanity"); |
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2019 _ref_counter = _ref_counter_limit; |
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2020 } |
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2021 |
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2022 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2023 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2024 |
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2025 template <class T> void do_oop_work(T* p) { |
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2026 if (!_cm->has_overflown()) { |
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2027 oop obj = oopDesc::load_decode_heap_oop(p); |
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2028 if (_cm->verbose_high()) |
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2029 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2030 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2031 _task->task_id(), p, (void*) obj); |
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2032 |
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2033 _task->deal_with_reference(obj); |
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2034 _ref_counter--; |
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2035 |
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2036 if (_ref_counter == 0) { |
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2037 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2038 // reachable from them on to the local stack (and possibly the global stack). |
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2039 // Call do_marking_step() to process these entries. We call the routine in a |
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2040 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2041 // with the entries that we've pushed as a result of the deal_with_reference |
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2042 // calls above) or we overflow. |
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2043 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2044 // while there may still be some work to do. (See the comment at the |
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2045 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2046 // is reaching the specified time target.) It is only when |
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2047 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2048 // that the marking has completed. |
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2049 do { |
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2050 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2051 _task->do_marking_step(mark_step_duration_ms, |
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2052 false /* do_stealing */, |
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2053 false /* do_termination */); |
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2054 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2055 _ref_counter = _ref_counter_limit; |
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2056 } |
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2057 } else { |
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2058 if (_cm->verbose_high()) |
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2059 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
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2060 } |
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2061 } |
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2062 }; |
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2063 |
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2064 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
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2065 ConcurrentMark* _cm; |
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2066 CMTask* _task; |
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2067 public: |
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2068 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
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2069 _cm(cm), _task(task) |
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2070 {} |
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2071 |
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2072 void do_void() { |
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2073 do { |
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2074 if (_cm->verbose_high()) |
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2075 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", _task->task_id()); |
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2076 |
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2077 // We call CMTask::do_marking_step() to completely drain the local and |
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2078 // global marking stacks. The routine is called in a loop, which we'll |
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2079 // exit if there's nothing more to do (i.e. we'completely drained the |
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2080 // entries that were pushed as a result of applying the |
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2081 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
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2082 // lists above) or we overflow the global marking stack. |
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2083 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2084 // while there may still be some work to do. (See the comment at the |
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2085 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2086 // is reaching the specified time target.) It is only when |
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2087 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2088 // that the marking has completed. |
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2089 |
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2090 _task->do_marking_step(1000000000.0 /* something very large */, |
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2091 true /* do_stealing */, |
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2092 true /* do_termination */); |
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2093 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2094 } |
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2095 }; |
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2096 |
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2097 // Implementation of AbstractRefProcTaskExecutor for G1 |
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2098 class G1RefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2099 private: |
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2100 G1CollectedHeap* _g1h; |
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2101 ConcurrentMark* _cm; |
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2102 CMBitMap* _bitmap; |
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2103 WorkGang* _workers; |
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2104 int _active_workers; |
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2105 |
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2106 public: |
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2107 G1RefProcTaskExecutor(G1CollectedHeap* g1h, |
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2108 ConcurrentMark* cm, |
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2109 CMBitMap* bitmap, |
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2110 WorkGang* workers, |
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2111 int n_workers) : |
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2112 _g1h(g1h), _cm(cm), _bitmap(bitmap), |
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2113 _workers(workers), _active_workers(n_workers) |
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2114 { } |
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2115 |
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2116 // Executes the given task using concurrent marking worker threads. |
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2117 virtual void execute(ProcessTask& task); |
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2118 virtual void execute(EnqueueTask& task); |
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2119 }; |
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2120 |
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2121 class G1RefProcTaskProxy: public AbstractGangTask { |
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2122 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2123 ProcessTask& _proc_task; |
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2124 G1CollectedHeap* _g1h; |
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2125 ConcurrentMark* _cm; |
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2126 CMBitMap* _bitmap; |
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2127 |
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2128 public: |
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2129 G1RefProcTaskProxy(ProcessTask& proc_task, |
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2130 G1CollectedHeap* g1h, |
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2131 ConcurrentMark* cm, |
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2132 CMBitMap* bitmap) : |
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2133 AbstractGangTask("Process reference objects in parallel"), |
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2134 _proc_task(proc_task), _g1h(g1h), _cm(cm), _bitmap(bitmap) |
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2135 {} |
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2136 |
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2137 virtual void work(int i) { |
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2138 CMTask* marking_task = _cm->task(i); |
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2139 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2140 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task, _bitmap); |
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2141 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2142 |
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2143 _proc_task.work(i, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2144 } |
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2145 }; |
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2146 |
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2147 void G1RefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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2148 assert(_workers != NULL, "Need parallel worker threads."); |
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2149 |
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2150 G1RefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm, _bitmap); |
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2151 |
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2152 // We need to reset the phase for each task execution so that |
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2153 // the termination protocol of CMTask::do_marking_step works. |
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2154 _cm->set_phase(_active_workers, false /* concurrent */); |
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2155 _g1h->set_par_threads(_active_workers); |
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2156 _workers->run_task(&proc_task_proxy); |
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2157 _g1h->set_par_threads(0); |
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2158 } |
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2159 |
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2160 class G1RefEnqueueTaskProxy: public AbstractGangTask { |
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2161 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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2162 EnqueueTask& _enq_task; |
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2163 |
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2164 public: |
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2165 G1RefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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2166 AbstractGangTask("Enqueue reference objects in parallel"), |
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2167 _enq_task(enq_task) |
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2168 { } |
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2169 |
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2170 virtual void work(int i) { |
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2171 _enq_task.work(i); |
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2172 } |
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2173 }; |
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2174 |
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2175 void G1RefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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2176 assert(_workers != NULL, "Need parallel worker threads."); |
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2177 |
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2178 G1RefEnqueueTaskProxy enq_task_proxy(enq_task); |
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2179 |
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2180 _g1h->set_par_threads(_active_workers); |
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2181 _workers->run_task(&enq_task_proxy); |
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2182 _g1h->set_par_threads(0); |
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2183 } |
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2184 |
342 | 2185 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
2186 ResourceMark rm; | |
2187 HandleMark hm; | |
453
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2188 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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2189 ReferenceProcessor* rp = g1h->ref_processor(); |
342 | 2190 |
1974
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2191 // See the comment in G1CollectedHeap::ref_processing_init() |
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2192 // about how reference processing currently works in G1. |
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2193 |
342 | 2194 // Process weak references. |
457
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2195 rp->setup_policy(clear_all_soft_refs); |
342 | 2196 assert(_markStack.isEmpty(), "mark stack should be empty"); |
2197 | |
2037
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2198 G1CMIsAliveClosure g1_is_alive(g1h); |
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2199 G1CMKeepAliveClosure g1_keep_alive(g1h, this, nextMarkBitMap()); |
342 | 2200 G1CMDrainMarkingStackClosure |
2037
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2201 g1_drain_mark_stack(nextMarkBitMap(), &_markStack, &g1_keep_alive); |
2174
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2202 // We use the work gang from the G1CollectedHeap and we utilize all |
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2203 // the worker threads. |
2369
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2204 int active_workers = g1h->workers() ? g1h->workers()->total_workers() : 1; |
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2205 active_workers = MAX2(MIN2(active_workers, (int)_max_task_num), 1); |
2174
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2206 |
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2207 G1RefProcTaskExecutor par_task_executor(g1h, this, nextMarkBitMap(), |
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2208 g1h->workers(), active_workers); |
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2209 |
2369
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2210 |
2174
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2211 if (rp->processing_is_mt()) { |
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2212 // Set the degree of MT here. If the discovery is done MT, there |
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2213 // may have been a different number of threads doing the discovery |
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2214 // and a different number of discovered lists may have Ref objects. |
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2215 // That is OK as long as the Reference lists are balanced (see |
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2216 // balance_all_queues() and balance_queues()). |
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2217 rp->set_active_mt_degree(active_workers); |
2174
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2218 |
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2219 rp->process_discovered_references(&g1_is_alive, |
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2220 &g1_keep_alive, |
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2221 &g1_drain_mark_stack, |
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|
2222 &par_task_executor); |
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2223 |
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2224 // The work routines of the parallel keep_alive and drain_marking_stack |
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2225 // will set the has_overflown flag if we overflow the global marking |
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|
2226 // stack. |
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2227 } else { |
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2228 rp->process_discovered_references(&g1_is_alive, |
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2229 &g1_keep_alive, |
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2230 &g1_drain_mark_stack, |
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|
2231 NULL); |
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|
2232 |
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|
2233 } |
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|
2234 |
342 | 2235 assert(_markStack.overflow() || _markStack.isEmpty(), |
2174
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2236 "mark stack should be empty (unless it overflowed)"); |
342 | 2237 if (_markStack.overflow()) { |
2174
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2238 // Should have been done already when we tried to push an |
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|
2239 // entry on to the global mark stack. But let's do it again. |
342 | 2240 set_has_overflown(); |
2241 } | |
2242 | |
2174
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2243 if (rp->processing_is_mt()) { |
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2244 assert(rp->num_q() == active_workers, "why not"); |
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2245 rp->enqueue_discovered_references(&par_task_executor); |
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|
2246 } else { |
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|
2247 rp->enqueue_discovered_references(); |
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|
2248 } |
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|
2249 |
342 | 2250 rp->verify_no_references_recorded(); |
2251 assert(!rp->discovery_enabled(), "should have been disabled"); | |
2252 | |
2177
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|
2253 // Now clean up stale oops in StringTable |
2037
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|
2254 StringTable::unlink(&g1_is_alive); |
2177
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diff
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|
2255 // Clean up unreferenced symbols in symbol table. |
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|
2256 SymbolTable::unlink(); |
342 | 2257 } |
2258 | |
2259 void ConcurrentMark::swapMarkBitMaps() { | |
2260 CMBitMapRO* temp = _prevMarkBitMap; | |
2261 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2262 _nextMarkBitMap = (CMBitMap*) temp; | |
2263 } | |
2264 | |
2265 class CMRemarkTask: public AbstractGangTask { | |
2266 private: | |
2267 ConcurrentMark *_cm; | |
2268 | |
2269 public: | |
2270 void work(int worker_i) { | |
2271 // Since all available tasks are actually started, we should | |
2272 // only proceed if we're supposed to be actived. | |
2273 if ((size_t)worker_i < _cm->active_tasks()) { | |
2274 CMTask* task = _cm->task(worker_i); | |
2275 task->record_start_time(); | |
2276 do { | |
2174
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2277 task->do_marking_step(1000000000.0 /* something very large */, |
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2278 true /* do_stealing */, |
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|
2279 true /* do_termination */); |
342 | 2280 } while (task->has_aborted() && !_cm->has_overflown()); |
2281 // If we overflow, then we do not want to restart. We instead | |
2282 // want to abort remark and do concurrent marking again. | |
2283 task->record_end_time(); | |
2284 } | |
2285 } | |
2286 | |
2287 CMRemarkTask(ConcurrentMark* cm) : | |
2288 AbstractGangTask("Par Remark"), _cm(cm) { } | |
2289 }; | |
2290 | |
2291 void ConcurrentMark::checkpointRootsFinalWork() { | |
2292 ResourceMark rm; | |
2293 HandleMark hm; | |
2294 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2295 | |
2296 g1h->ensure_parsability(false); | |
2297 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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1719
diff
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|
2298 if (G1CollectedHeap::use_parallel_gc_threads()) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
2299 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2300 // this is remark, so we'll use up all available threads |
2301 int active_workers = ParallelGCThreads; | |
2174
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2302 set_phase(active_workers, false /* concurrent */); |
342 | 2303 |
2304 CMRemarkTask remarkTask(this); | |
2305 // We will start all available threads, even if we decide that the | |
2306 // active_workers will be fewer. The extra ones will just bail out | |
2307 // immediately. | |
2308 int n_workers = g1h->workers()->total_workers(); | |
2309 g1h->set_par_threads(n_workers); | |
2310 g1h->workers()->run_task(&remarkTask); | |
2311 g1h->set_par_threads(0); | |
2312 } else { | |
989
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|
2313 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2314 // this is remark, so we'll use up all available threads |
2315 int active_workers = 1; | |
2174
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|
2316 set_phase(active_workers, false /* concurrent */); |
342 | 2317 |
2318 CMRemarkTask remarkTask(this); | |
2319 // We will start all available threads, even if we decide that the | |
2320 // active_workers will be fewer. The extra ones will just bail out | |
2321 // immediately. | |
2322 remarkTask.work(0); | |
2323 } | |
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2324 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
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2325 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2326 |
2327 print_stats(); | |
2328 | |
2329 #if VERIFY_OBJS_PROCESSED | |
2330 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
2331 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
2332 _scan_obj_cl.objs_processed, | |
2333 ThreadLocalObjQueue::objs_enqueued); | |
2334 guarantee(_scan_obj_cl.objs_processed == | |
2335 ThreadLocalObjQueue::objs_enqueued, | |
2336 "Different number of objs processed and enqueued."); | |
2337 } | |
2338 #endif | |
2339 } | |
2340 | |
1044 | 2341 #ifndef PRODUCT |
2342 | |
1388 | 2343 class PrintReachableOopClosure: public OopClosure { |
342 | 2344 private: |
2345 G1CollectedHeap* _g1h; | |
2346 CMBitMapRO* _bitmap; | |
2347 outputStream* _out; | |
1044 | 2348 bool _use_prev_marking; |
1388 | 2349 bool _all; |
342 | 2350 |
2351 public: | |
1388 | 2352 PrintReachableOopClosure(CMBitMapRO* bitmap, |
2353 outputStream* out, | |
2354 bool use_prev_marking, | |
2355 bool all) : | |
1044 | 2356 _g1h(G1CollectedHeap::heap()), |
1388 | 2357 _bitmap(bitmap), _out(out), _use_prev_marking(use_prev_marking), _all(all) { } |
342 | 2358 |
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2359 void do_oop(narrowOop* p) { do_oop_work(p); } |
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2360 void do_oop( oop* p) { do_oop_work(p); } |
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2361 |
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2362 template <class T> void do_oop_work(T* p) { |
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2363 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2364 const char* str = NULL; |
2365 const char* str2 = ""; | |
2366 | |
1388 | 2367 if (obj == NULL) { |
2368 str = ""; | |
2369 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2370 str = " O"; | |
2371 } else { | |
342 | 2372 HeapRegion* hr = _g1h->heap_region_containing(obj); |
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2373 guarantee(hr != NULL, "invariant"); |
1044 | 2374 bool over_tams = false; |
2375 if (_use_prev_marking) { | |
2376 over_tams = hr->obj_allocated_since_prev_marking(obj); | |
2377 } else { | |
2378 over_tams = hr->obj_allocated_since_next_marking(obj); | |
2379 } | |
1388 | 2380 bool marked = _bitmap->isMarked((HeapWord*) obj); |
1044 | 2381 |
2382 if (over_tams) { | |
1388 | 2383 str = " >"; |
2384 if (marked) { | |
342 | 2385 str2 = " AND MARKED"; |
1044 | 2386 } |
1388 | 2387 } else if (marked) { |
2388 str = " M"; | |
1044 | 2389 } else { |
1388 | 2390 str = " NOT"; |
1044 | 2391 } |
342 | 2392 } |
2393 | |
1388 | 2394 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2395 p, (void*) obj, str, str2); |
2396 } | |
2397 }; | |
2398 | |
1388 | 2399 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2400 private: |
1044 | 2401 CMBitMapRO* _bitmap; |
342 | 2402 outputStream* _out; |
1044 | 2403 bool _use_prev_marking; |
1388 | 2404 bool _all; |
2405 HeapRegion* _hr; | |
342 | 2406 |
2407 public: | |
1388 | 2408 PrintReachableObjectClosure(CMBitMapRO* bitmap, |
2409 outputStream* out, | |
2410 bool use_prev_marking, | |
2411 bool all, | |
2412 HeapRegion* hr) : | |
2413 _bitmap(bitmap), _out(out), | |
2414 _use_prev_marking(use_prev_marking), _all(all), _hr(hr) { } | |
2415 | |
2416 void do_object(oop o) { | |
2417 bool over_tams; | |
2418 if (_use_prev_marking) { | |
2419 over_tams = _hr->obj_allocated_since_prev_marking(o); | |
2420 } else { | |
2421 over_tams = _hr->obj_allocated_since_next_marking(o); | |
2422 } | |
2423 bool marked = _bitmap->isMarked((HeapWord*) o); | |
2424 bool print_it = _all || over_tams || marked; | |
2425 | |
2426 if (print_it) { | |
2427 _out->print_cr(" "PTR_FORMAT"%s", | |
2428 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
2429 PrintReachableOopClosure oopCl(_bitmap, _out, _use_prev_marking, _all); | |
2430 o->oop_iterate(&oopCl); | |
2431 } | |
342 | 2432 } |
2433 }; | |
2434 | |
1388 | 2435 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2436 private: |
1044 | 2437 CMBitMapRO* _bitmap; |
342 | 2438 outputStream* _out; |
1044 | 2439 bool _use_prev_marking; |
1388 | 2440 bool _all; |
342 | 2441 |
2442 public: | |
2443 bool doHeapRegion(HeapRegion* hr) { | |
2444 HeapWord* b = hr->bottom(); | |
2445 HeapWord* e = hr->end(); | |
2446 HeapWord* t = hr->top(); | |
1044 | 2447 HeapWord* p = NULL; |
2448 if (_use_prev_marking) { | |
2449 p = hr->prev_top_at_mark_start(); | |
2450 } else { | |
2451 p = hr->next_top_at_mark_start(); | |
2452 } | |
342 | 2453 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2454 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2455 _out->cr(); |
2456 | |
2457 HeapWord* from = b; | |
2458 HeapWord* to = t; | |
2459 | |
2460 if (to > from) { | |
2461 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2462 _out->cr(); | |
2463 PrintReachableObjectClosure ocl(_bitmap, _out, | |
2464 _use_prev_marking, _all, hr); | |
2465 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); | |
2466 _out->cr(); | |
2467 } | |
342 | 2468 |
2469 return false; | |
2470 } | |
2471 | |
1388 | 2472 PrintReachableRegionClosure(CMBitMapRO* bitmap, |
2473 outputStream* out, | |
2474 bool use_prev_marking, | |
2475 bool all) : | |
2476 _bitmap(bitmap), _out(out), _use_prev_marking(use_prev_marking), _all(all) { } | |
342 | 2477 }; |
2478 | |
1388 | 2479 void ConcurrentMark::print_reachable(const char* str, |
2480 bool use_prev_marking, | |
2481 bool all) { | |
2482 gclog_or_tty->cr(); | |
2483 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2484 |
2485 if (G1PrintReachableBaseFile == NULL) { | |
2486 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2487 return; | |
2488 } | |
2489 | |
2490 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2491 (JVM_MAXPATHLEN - 1)) { | |
2492 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2493 return; | |
2494 } | |
2495 | |
2496 char file_name[JVM_MAXPATHLEN]; | |
2497 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2498 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2499 | |
2500 fileStream fout(file_name); | |
2501 if (!fout.is_open()) { | |
2502 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2503 return; | |
2504 } | |
2505 | |
2506 outputStream* out = &fout; | |
2507 | |
2508 CMBitMapRO* bitmap = NULL; | |
2509 if (use_prev_marking) { | |
2510 bitmap = _prevMarkBitMap; | |
2511 } else { | |
2512 bitmap = _nextMarkBitMap; | |
2513 } | |
2514 | |
2515 out->print_cr("-- USING %s", (use_prev_marking) ? "PTAMS" : "NTAMS"); | |
2516 out->cr(); | |
2517 | |
1388 | 2518 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2519 out->cr(); |
1388 | 2520 PrintReachableRegionClosure rcl(bitmap, out, use_prev_marking, all); |
2521 _g1h->heap_region_iterate(&rcl); | |
1044 | 2522 out->cr(); |
2523 | |
2524 gclog_or_tty->print_cr(" done"); | |
1388 | 2525 gclog_or_tty->flush(); |
342 | 2526 } |
2527 | |
1044 | 2528 #endif // PRODUCT |
2529 | |
342 | 2530 // This note is for drainAllSATBBuffers and the code in between. |
2531 // In the future we could reuse a task to do this work during an | |
2532 // evacuation pause (since now tasks are not active and can be claimed | |
2533 // during an evacuation pause). This was a late change to the code and | |
2534 // is currently not being taken advantage of. | |
2535 | |
2536 class CMGlobalObjectClosure : public ObjectClosure { | |
2537 private: | |
2538 ConcurrentMark* _cm; | |
2539 | |
2540 public: | |
2541 void do_object(oop obj) { | |
2542 _cm->deal_with_reference(obj); | |
2543 } | |
2544 | |
2545 CMGlobalObjectClosure(ConcurrentMark* cm) : _cm(cm) { } | |
2546 }; | |
2547 | |
2548 void ConcurrentMark::deal_with_reference(oop obj) { | |
2549 if (verbose_high()) | |
2550 gclog_or_tty->print_cr("[global] we're dealing with reference "PTR_FORMAT, | |
2551 (void*) obj); | |
2552 | |
2553 | |
2554 HeapWord* objAddr = (HeapWord*) obj; | |
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2555 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
342 | 2556 if (_g1h->is_in_g1_reserved(objAddr)) { |
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2557 assert(obj != NULL, "is_in_g1_reserved should ensure this"); |
342 | 2558 HeapRegion* hr = _g1h->heap_region_containing(obj); |
2559 if (_g1h->is_obj_ill(obj, hr)) { | |
2560 if (verbose_high()) | |
2561 gclog_or_tty->print_cr("[global] "PTR_FORMAT" is not considered " | |
2562 "marked", (void*) obj); | |
2563 | |
2564 // we need to mark it first | |
2565 if (_nextMarkBitMap->parMark(objAddr)) { | |
2566 // No OrderAccess:store_load() is needed. It is implicit in the | |
2567 // CAS done in parMark(objAddr) above | |
2568 HeapWord* finger = _finger; | |
2569 if (objAddr < finger) { | |
2570 if (verbose_high()) | |
2571 gclog_or_tty->print_cr("[global] below the global finger " | |
2572 "("PTR_FORMAT"), pushing it", finger); | |
2573 if (!mark_stack_push(obj)) { | |
2574 if (verbose_low()) | |
2575 gclog_or_tty->print_cr("[global] global stack overflow during " | |
2576 "deal_with_reference"); | |
2577 } | |
2578 } | |
2579 } | |
2580 } | |
2581 } | |
2582 } | |
2583 | |
2584 void ConcurrentMark::drainAllSATBBuffers() { | |
2585 CMGlobalObjectClosure oc(this); | |
2586 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
2587 satb_mq_set.set_closure(&oc); | |
2588 | |
2589 while (satb_mq_set.apply_closure_to_completed_buffer()) { | |
2590 if (verbose_medium()) | |
2591 gclog_or_tty->print_cr("[global] processed an SATB buffer"); | |
2592 } | |
2593 | |
2594 // no need to check whether we should do this, as this is only | |
2595 // called during an evacuation pause | |
2596 satb_mq_set.iterate_closure_all_threads(); | |
2597 | |
2598 satb_mq_set.set_closure(NULL); | |
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2599 assert(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2600 } |
2601 | |
2602 void ConcurrentMark::markPrev(oop p) { | |
2603 // Note we are overriding the read-only view of the prev map here, via | |
2604 // the cast. | |
2605 ((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*)p); | |
2606 } | |
2607 | |
2608 void ConcurrentMark::clear(oop p) { | |
2609 assert(p != NULL && p->is_oop(), "expected an oop"); | |
2610 HeapWord* addr = (HeapWord*)p; | |
2611 assert(addr >= _nextMarkBitMap->startWord() || | |
2612 addr < _nextMarkBitMap->endWord(), "in a region"); | |
2613 | |
2614 _nextMarkBitMap->clear(addr); | |
2615 } | |
2616 | |
2617 void ConcurrentMark::clearRangeBothMaps(MemRegion mr) { | |
2618 // Note we are overriding the read-only view of the prev map here, via | |
2619 // the cast. | |
2620 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
2621 _nextMarkBitMap->clearRange(mr); | |
2622 } | |
2623 | |
2624 HeapRegion* | |
2625 ConcurrentMark::claim_region(int task_num) { | |
2626 // "checkpoint" the finger | |
2627 HeapWord* finger = _finger; | |
2628 | |
2629 // _heap_end will not change underneath our feet; it only changes at | |
2630 // yield points. | |
2631 while (finger < _heap_end) { | |
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2632 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2633 |
2634 // is the gap between reading the finger and doing the CAS too long? | |
2635 | |
2636 HeapRegion* curr_region = _g1h->heap_region_containing(finger); | |
2637 HeapWord* bottom = curr_region->bottom(); | |
2638 HeapWord* end = curr_region->end(); | |
2639 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2640 | |
2641 if (verbose_low()) | |
2642 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " | |
2643 "["PTR_FORMAT", "PTR_FORMAT"), " | |
2644 "limit = "PTR_FORMAT, | |
2645 task_num, curr_region, bottom, end, limit); | |
2646 | |
2647 HeapWord* res = | |
2648 (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
2649 if (res == finger) { | |
2650 // we succeeded | |
2651 | |
2652 // notice that _finger == end cannot be guaranteed here since, | |
2653 // someone else might have moved the finger even further | |
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2654 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2655 |
2656 if (verbose_low()) | |
2657 gclog_or_tty->print_cr("[%d] we were successful with region = " | |
2658 PTR_FORMAT, task_num, curr_region); | |
2659 | |
2660 if (limit > bottom) { | |
2661 if (verbose_low()) | |
2662 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " | |
2663 "returning it ", task_num, curr_region); | |
2664 return curr_region; | |
2665 } else { | |
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2666 assert(limit == bottom, |
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2667 "the region limit should be at bottom"); |
342 | 2668 if (verbose_low()) |
2669 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " | |
2670 "returning NULL", task_num, curr_region); | |
2671 // we return NULL and the caller should try calling | |
2672 // claim_region() again. | |
2673 return NULL; | |
2674 } | |
2675 } else { | |
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2676 assert(_finger > finger, "the finger should have moved forward"); |
342 | 2677 if (verbose_low()) |
2678 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " | |
2679 "global finger = "PTR_FORMAT", " | |
2680 "our finger = "PTR_FORMAT, | |
2681 task_num, _finger, finger); | |
2682 | |
2683 // read it again | |
2684 finger = _finger; | |
2685 } | |
2686 } | |
2687 | |
2688 return NULL; | |
2689 } | |
2690 | |
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2691 bool ConcurrentMark::invalidate_aborted_regions_in_cset() { |
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2692 bool result = false; |
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2693 for (int i = 0; i < (int)_max_task_num; ++i) { |
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2694 CMTask* the_task = _tasks[i]; |
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2695 MemRegion mr = the_task->aborted_region(); |
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2696 if (mr.start() != NULL) { |
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2697 assert(mr.end() != NULL, "invariant"); |
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2698 assert(mr.word_size() > 0, "invariant"); |
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2699 HeapRegion* hr = _g1h->heap_region_containing(mr.start()); |
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2700 assert(hr != NULL, "invariant"); |
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2701 if (hr->in_collection_set()) { |
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2702 // The region points into the collection set |
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2703 the_task->set_aborted_region(MemRegion()); |
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2704 result = true; |
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2705 } |
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2706 } |
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2707 } |
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2708 return result; |
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2709 } |
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2710 |
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2711 bool ConcurrentMark::has_aborted_regions() { |
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2712 for (int i = 0; i < (int)_max_task_num; ++i) { |
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2713 CMTask* the_task = _tasks[i]; |
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2714 MemRegion mr = the_task->aborted_region(); |
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2715 if (mr.start() != NULL) { |
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2716 assert(mr.end() != NULL, "invariant"); |
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2717 assert(mr.word_size() > 0, "invariant"); |
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2718 return true; |
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2719 } |
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2720 } |
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2721 return false; |
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2722 } |
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2723 |
342 | 2724 void ConcurrentMark::oops_do(OopClosure* cl) { |
2725 if (_markStack.size() > 0 && verbose_low()) | |
2726 gclog_or_tty->print_cr("[global] scanning the global marking stack, " | |
2727 "size = %d", _markStack.size()); | |
2728 // we first iterate over the contents of the mark stack... | |
2729 _markStack.oops_do(cl); | |
2730 | |
2731 for (int i = 0; i < (int)_max_task_num; ++i) { | |
2732 OopTaskQueue* queue = _task_queues->queue((int)i); | |
2733 | |
2734 if (queue->size() > 0 && verbose_low()) | |
2735 gclog_or_tty->print_cr("[global] scanning task queue of task %d, " | |
2736 "size = %d", i, queue->size()); | |
2737 | |
2738 // ...then over the contents of the all the task queues. | |
2739 queue->oops_do(cl); | |
2740 } | |
2741 | |
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2742 // Invalidate any entries, that are in the region stack, that |
342 | 2743 // point into the collection set |
2744 if (_regionStack.invalidate_entries_into_cset()) { | |
2745 // otherwise, any gray objects copied during the evacuation pause | |
2746 // might not be visited. | |
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2747 assert(_should_gray_objects, "invariant"); |
342 | 2748 } |
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2749 |
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2750 // Invalidate any aborted regions, recorded in the individual CM |
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2751 // tasks, that point into the collection set. |
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2752 if (invalidate_aborted_regions_in_cset()) { |
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2753 // otherwise, any gray objects copied during the evacuation pause |
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2754 // might not be visited. |
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2755 assert(_should_gray_objects, "invariant"); |
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2756 } |
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2757 |
342 | 2758 } |
2759 | |
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2760 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
342 | 2761 _markStack.setEmpty(); |
2762 _markStack.clear_overflow(); | |
2763 _regionStack.setEmpty(); | |
2764 _regionStack.clear_overflow(); | |
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2765 if (clear_overflow) { |
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2766 clear_has_overflown(); |
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2767 } else { |
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2768 assert(has_overflown(), "pre-condition"); |
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2769 } |
342 | 2770 _finger = _heap_start; |
2771 | |
2772 for (int i = 0; i < (int)_max_task_num; ++i) { | |
2773 OopTaskQueue* queue = _task_queues->queue(i); | |
2774 queue->set_empty(); | |
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2775 // Clear any partial regions from the CMTasks |
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2776 _tasks[i]->clear_aborted_region(); |
342 | 2777 } |
2778 } | |
2779 | |
2780 void ConcurrentMark::print_stats() { | |
2781 if (verbose_stats()) { | |
2782 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
2783 for (size_t i = 0; i < _active_tasks; ++i) { | |
2784 _tasks[i]->print_stats(); | |
2785 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
2786 } | |
2787 } | |
2788 } | |
2789 | |
2790 class CSMarkOopClosure: public OopClosure { | |
2791 friend class CSMarkBitMapClosure; | |
2792 | |
2793 G1CollectedHeap* _g1h; | |
2794 CMBitMap* _bm; | |
2795 ConcurrentMark* _cm; | |
2796 oop* _ms; | |
2797 jint* _array_ind_stack; | |
2798 int _ms_size; | |
2799 int _ms_ind; | |
2800 int _array_increment; | |
2801 | |
2802 bool push(oop obj, int arr_ind = 0) { | |
2803 if (_ms_ind == _ms_size) { | |
2804 gclog_or_tty->print_cr("Mark stack is full."); | |
2805 return false; | |
2806 } | |
2807 _ms[_ms_ind] = obj; | |
2808 if (obj->is_objArray()) _array_ind_stack[_ms_ind] = arr_ind; | |
2809 _ms_ind++; | |
2810 return true; | |
2811 } | |
2812 | |
2813 oop pop() { | |
2814 if (_ms_ind == 0) return NULL; | |
2815 else { | |
2816 _ms_ind--; | |
2817 return _ms[_ms_ind]; | |
2818 } | |
2819 } | |
2820 | |
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2821 template <class T> bool drain() { |
342 | 2822 while (_ms_ind > 0) { |
2823 oop obj = pop(); | |
2824 assert(obj != NULL, "Since index was non-zero."); | |
2825 if (obj->is_objArray()) { | |
2826 jint arr_ind = _array_ind_stack[_ms_ind]; | |
2827 objArrayOop aobj = objArrayOop(obj); | |
2828 jint len = aobj->length(); | |
2829 jint next_arr_ind = arr_ind + _array_increment; | |
2830 if (next_arr_ind < len) { | |
2831 push(obj, next_arr_ind); | |
2832 } | |
2833 // Now process this portion of this one. | |
2834 int lim = MIN2(next_arr_ind, len); | |
2835 for (int j = arr_ind; j < lim; j++) { | |
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2836 do_oop(aobj->objArrayOopDesc::obj_at_addr<T>(j)); |
342 | 2837 } |
2838 | |
2839 } else { | |
2840 obj->oop_iterate(this); | |
2841 } | |
2842 if (abort()) return false; | |
2843 } | |
2844 return true; | |
2845 } | |
2846 | |
2847 public: | |
2848 CSMarkOopClosure(ConcurrentMark* cm, int ms_size) : | |
2849 _g1h(G1CollectedHeap::heap()), | |
2850 _cm(cm), | |
2851 _bm(cm->nextMarkBitMap()), | |
2852 _ms_size(ms_size), _ms_ind(0), | |
2853 _ms(NEW_C_HEAP_ARRAY(oop, ms_size)), | |
2854 _array_ind_stack(NEW_C_HEAP_ARRAY(jint, ms_size)), | |
2855 _array_increment(MAX2(ms_size/8, 16)) | |
2856 {} | |
2857 | |
2858 ~CSMarkOopClosure() { | |
2859 FREE_C_HEAP_ARRAY(oop, _ms); | |
2860 FREE_C_HEAP_ARRAY(jint, _array_ind_stack); | |
2861 } | |
2862 | |
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2863 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2864 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2865 |
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2866 template <class T> void do_oop_work(T* p) { |
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2867 T heap_oop = oopDesc::load_heap_oop(p); |
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2868 if (oopDesc::is_null(heap_oop)) return; |
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2869 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
342 | 2870 if (obj->is_forwarded()) { |
2871 // If the object has already been forwarded, we have to make sure | |
2872 // that it's marked. So follow the forwarding pointer. Note that | |
2873 // this does the right thing for self-forwarding pointers in the | |
2874 // evacuation failure case. | |
2875 obj = obj->forwardee(); | |
2876 } | |
2877 HeapRegion* hr = _g1h->heap_region_containing(obj); | |
2878 if (hr != NULL) { | |
2879 if (hr->in_collection_set()) { | |
2880 if (_g1h->is_obj_ill(obj)) { | |
2881 _bm->mark((HeapWord*)obj); | |
2882 if (!push(obj)) { | |
2883 gclog_or_tty->print_cr("Setting abort in CSMarkOopClosure because push failed."); | |
2884 set_abort(); | |
2885 } | |
2886 } | |
2887 } else { | |
2888 // Outside the collection set; we need to gray it | |
2889 _cm->deal_with_reference(obj); | |
2890 } | |
2891 } | |
2892 } | |
2893 }; | |
2894 | |
2895 class CSMarkBitMapClosure: public BitMapClosure { | |
2896 G1CollectedHeap* _g1h; | |
2897 CMBitMap* _bitMap; | |
2898 ConcurrentMark* _cm; | |
2899 CSMarkOopClosure _oop_cl; | |
2900 public: | |
2901 CSMarkBitMapClosure(ConcurrentMark* cm, int ms_size) : | |
2902 _g1h(G1CollectedHeap::heap()), | |
2903 _bitMap(cm->nextMarkBitMap()), | |
2904 _oop_cl(cm, ms_size) | |
2905 {} | |
2906 | |
2907 ~CSMarkBitMapClosure() {} | |
2908 | |
2909 bool do_bit(size_t offset) { | |
2910 // convert offset into a HeapWord* | |
2911 HeapWord* addr = _bitMap->offsetToHeapWord(offset); | |
2912 assert(_bitMap->endWord() && addr < _bitMap->endWord(), | |
2913 "address out of range"); | |
2914 assert(_bitMap->isMarked(addr), "tautology"); | |
2915 oop obj = oop(addr); | |
2916 if (!obj->is_forwarded()) { | |
2917 if (!_oop_cl.push(obj)) return false; | |
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2918 if (UseCompressedOops) { |
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2919 if (!_oop_cl.drain<narrowOop>()) return false; |
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2920 } else { |
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2921 if (!_oop_cl.drain<oop>()) return false; |
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2922 } |
342 | 2923 } |
2924 // Otherwise... | |
2925 return true; | |
2926 } | |
2927 }; | |
2928 | |
2929 | |
2930 class CompleteMarkingInCSHRClosure: public HeapRegionClosure { | |
2931 CMBitMap* _bm; | |
2932 CSMarkBitMapClosure _bit_cl; | |
2933 enum SomePrivateConstants { | |
2934 MSSize = 1000 | |
2935 }; | |
2936 bool _completed; | |
2937 public: | |
2938 CompleteMarkingInCSHRClosure(ConcurrentMark* cm) : | |
2939 _bm(cm->nextMarkBitMap()), | |
2940 _bit_cl(cm, MSSize), | |
2941 _completed(true) | |
2942 {} | |
2943 | |
2944 ~CompleteMarkingInCSHRClosure() {} | |
2945 | |
2946 bool doHeapRegion(HeapRegion* r) { | |
2947 if (!r->evacuation_failed()) { | |
2948 MemRegion mr = MemRegion(r->bottom(), r->next_top_at_mark_start()); | |
2949 if (!mr.is_empty()) { | |
2950 if (!_bm->iterate(&_bit_cl, mr)) { | |
2951 _completed = false; | |
2952 return true; | |
2953 } | |
2954 } | |
2955 } | |
2956 return false; | |
2957 } | |
2958 | |
2959 bool completed() { return _completed; } | |
2960 }; | |
2961 | |
2962 class ClearMarksInHRClosure: public HeapRegionClosure { | |
2963 CMBitMap* _bm; | |
2964 public: | |
2965 ClearMarksInHRClosure(CMBitMap* bm): _bm(bm) { } | |
2966 | |
2967 bool doHeapRegion(HeapRegion* r) { | |
2968 if (!r->used_region().is_empty() && !r->evacuation_failed()) { | |
2969 MemRegion usedMR = r->used_region(); | |
2970 _bm->clearRange(r->used_region()); | |
2971 } | |
2972 return false; | |
2973 } | |
2974 }; | |
2975 | |
2976 void ConcurrentMark::complete_marking_in_collection_set() { | |
2977 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2978 | |
2979 if (!g1h->mark_in_progress()) { | |
2980 g1h->g1_policy()->record_mark_closure_time(0.0); | |
2981 return; | |
2982 } | |
2983 | |
2984 int i = 1; | |
2985 double start = os::elapsedTime(); | |
2986 while (true) { | |
2987 i++; | |
2988 CompleteMarkingInCSHRClosure cmplt(this); | |
2989 g1h->collection_set_iterate(&cmplt); | |
2990 if (cmplt.completed()) break; | |
2991 } | |
2992 double end_time = os::elapsedTime(); | |
2993 double elapsed_time_ms = (end_time - start) * 1000.0; | |
2994 g1h->g1_policy()->record_mark_closure_time(elapsed_time_ms); | |
2995 | |
2996 ClearMarksInHRClosure clr(nextMarkBitMap()); | |
2997 g1h->collection_set_iterate(&clr); | |
2998 } | |
2999 | |
3000 // The next two methods deal with the following optimisation. Some | |
3001 // objects are gray by being marked and located above the finger. If | |
3002 // they are copied, during an evacuation pause, below the finger then | |
3003 // the need to be pushed on the stack. The observation is that, if | |
3004 // there are no regions in the collection set located above the | |
3005 // finger, then the above cannot happen, hence we do not need to | |
3006 // explicitly gray any objects when copying them to below the | |
3007 // finger. The global stack will be scanned to ensure that, if it | |
3008 // points to objects being copied, it will update their | |
3009 // location. There is a tricky situation with the gray objects in | |
3010 // region stack that are being coped, however. See the comment in | |
3011 // newCSet(). | |
3012 | |
3013 void ConcurrentMark::newCSet() { | |
3014 if (!concurrent_marking_in_progress()) | |
3015 // nothing to do if marking is not in progress | |
3016 return; | |
3017 | |
3018 // find what the lowest finger is among the global and local fingers | |
3019 _min_finger = _finger; | |
3020 for (int i = 0; i < (int)_max_task_num; ++i) { | |
3021 CMTask* task = _tasks[i]; | |
3022 HeapWord* task_finger = task->finger(); | |
3023 if (task_finger != NULL && task_finger < _min_finger) | |
3024 _min_finger = task_finger; | |
3025 } | |
3026 | |
3027 _should_gray_objects = false; | |
3028 | |
3029 // This fixes a very subtle and fustrating bug. It might be the case | |
3030 // that, during en evacuation pause, heap regions that contain | |
3031 // objects that are gray (by being in regions contained in the | |
3032 // region stack) are included in the collection set. Since such gray | |
3033 // objects will be moved, and because it's not easy to redirect | |
3034 // region stack entries to point to a new location (because objects | |
3035 // in one region might be scattered to multiple regions after they | |
3036 // are copied), one option is to ensure that all marked objects | |
3037 // copied during a pause are pushed on the stack. Notice, however, | |
3038 // that this problem can only happen when the region stack is not | |
3039 // empty during an evacuation pause. So, we make the fix a bit less | |
3040 // conservative and ensure that regions are pushed on the stack, | |
3041 // irrespective whether all collection set regions are below the | |
3042 // finger, if the region stack is not empty. This is expected to be | |
3043 // a rare case, so I don't think it's necessary to be smarted about it. | |
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3044 if (!region_stack_empty() || has_aborted_regions()) |
342 | 3045 _should_gray_objects = true; |
3046 } | |
3047 | |
3048 void ConcurrentMark::registerCSetRegion(HeapRegion* hr) { | |
3049 if (!concurrent_marking_in_progress()) | |
3050 return; | |
3051 | |
3052 HeapWord* region_end = hr->end(); | |
3053 if (region_end > _min_finger) | |
3054 _should_gray_objects = true; | |
3055 } | |
3056 | |
3057 // abandon current marking iteration due to a Full GC | |
3058 void ConcurrentMark::abort() { | |
3059 // Clear all marks to force marking thread to do nothing | |
3060 _nextMarkBitMap->clearAll(); | |
3061 // Empty mark stack | |
3062 clear_marking_state(); | |
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3063 for (int i = 0; i < (int)_max_task_num; ++i) { |
342 | 3064 _tasks[i]->clear_region_fields(); |
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3065 } |
342 | 3066 _has_aborted = true; |
3067 | |
3068 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3069 satb_mq_set.abandon_partial_marking(); | |
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3070 // This can be called either during or outside marking, we'll read |
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3071 // the expected_active value from the SATB queue set. |
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3072 satb_mq_set.set_active_all_threads( |
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3073 false, /* new active value */ |
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3074 satb_mq_set.is_active() /* expected_active */); |
342 | 3075 } |
3076 | |
3077 static void print_ms_time_info(const char* prefix, const char* name, | |
3078 NumberSeq& ns) { | |
3079 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3080 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3081 if (ns.num() > 0) { | |
3082 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3083 prefix, ns.sd(), ns.maximum()); | |
3084 } | |
3085 } | |
3086 | |
3087 void ConcurrentMark::print_summary_info() { | |
3088 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3089 print_ms_time_info(" ", "init marks", _init_times); | |
3090 print_ms_time_info(" ", "remarks", _remark_times); | |
3091 { | |
3092 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3093 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3094 | |
3095 } | |
3096 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3097 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3098 _total_counting_time, | |
3099 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3100 (double)_cleanup_times.num() | |
3101 : 0.0)); | |
3102 if (G1ScrubRemSets) { | |
3103 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3104 _total_rs_scrub_time, | |
3105 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3106 (double)_cleanup_times.num() | |
3107 : 0.0)); | |
3108 } | |
3109 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3110 (_init_times.sum() + _remark_times.sum() + | |
3111 _cleanup_times.sum())/1000.0); | |
3112 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
3113 "(%8.2f s marking, %8.2f s counting).", | |
3114 cmThread()->vtime_accum(), | |
3115 cmThread()->vtime_mark_accum(), | |
3116 cmThread()->vtime_count_accum()); | |
3117 } | |
3118 | |
1019 | 3119 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
3120 _parallel_workers->print_worker_threads_on(st); | |
3121 } | |
3122 | |
342 | 3123 // Closures |
3124 // XXX: there seems to be a lot of code duplication here; | |
3125 // should refactor and consolidate the shared code. | |
3126 | |
3127 // This closure is used to mark refs into the CMS generation in | |
3128 // the CMS bit map. Called at the first checkpoint. | |
3129 | |
3130 // We take a break if someone is trying to stop the world. | |
3131 bool ConcurrentMark::do_yield_check(int worker_i) { | |
3132 if (should_yield()) { | |
3133 if (worker_i == 0) | |
3134 _g1h->g1_policy()->record_concurrent_pause(); | |
3135 cmThread()->yield(); | |
3136 if (worker_i == 0) | |
3137 _g1h->g1_policy()->record_concurrent_pause_end(); | |
3138 return true; | |
3139 } else { | |
3140 return false; | |
3141 } | |
3142 } | |
3143 | |
3144 bool ConcurrentMark::should_yield() { | |
3145 return cmThread()->should_yield(); | |
3146 } | |
3147 | |
3148 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3149 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3150 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3151 } | |
3152 | |
3153 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3154 void* last) { | |
3155 return | |
3156 containing_card_is_marked(start) && | |
3157 containing_card_is_marked(last); | |
3158 } | |
3159 | |
3160 #ifndef PRODUCT | |
3161 // for debugging purposes | |
3162 void ConcurrentMark::print_finger() { | |
3163 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3164 _heap_start, _heap_end, _finger); | |
3165 for (int i = 0; i < (int) _max_task_num; ++i) { | |
3166 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
3167 } | |
3168 gclog_or_tty->print_cr(""); | |
3169 } | |
3170 #endif | |
3171 | |
3172 // Closure for iteration over bitmaps | |
3173 class CMBitMapClosure : public BitMapClosure { | |
3174 private: | |
3175 // the bitmap that is being iterated over | |
3176 CMBitMap* _nextMarkBitMap; | |
3177 ConcurrentMark* _cm; | |
3178 CMTask* _task; | |
3179 // true if we're scanning a heap region claimed by the task (so that | |
3180 // we move the finger along), false if we're not, i.e. currently when | |
3181 // scanning a heap region popped from the region stack (so that we | |
3182 // do not move the task finger along; it'd be a mistake if we did so). | |
3183 bool _scanning_heap_region; | |
3184 | |
3185 public: | |
3186 CMBitMapClosure(CMTask *task, | |
3187 ConcurrentMark* cm, | |
3188 CMBitMap* nextMarkBitMap) | |
3189 : _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } | |
3190 | |
3191 void set_scanning_heap_region(bool scanning_heap_region) { | |
3192 _scanning_heap_region = scanning_heap_region; | |
3193 } | |
3194 | |
3195 bool do_bit(size_t offset) { | |
3196 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3197 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3198 assert( addr < _cm->finger(), "invariant"); |
342 | 3199 |
3200 if (_scanning_heap_region) { | |
3201 statsOnly( _task->increase_objs_found_on_bitmap() ); | |
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3202 assert(addr >= _task->finger(), "invariant"); |
342 | 3203 // We move that task's local finger along. |
3204 _task->move_finger_to(addr); | |
3205 } else { | |
3206 // We move the task's region finger along. | |
3207 _task->move_region_finger_to(addr); | |
3208 } | |
3209 | |
3210 _task->scan_object(oop(addr)); | |
3211 // we only partially drain the local queue and global stack | |
3212 _task->drain_local_queue(true); | |
3213 _task->drain_global_stack(true); | |
3214 | |
3215 // if the has_aborted flag has been raised, we need to bail out of | |
3216 // the iteration | |
3217 return !_task->has_aborted(); | |
3218 } | |
3219 }; | |
3220 | |
3221 // Closure for iterating over objects, currently only used for | |
3222 // processing SATB buffers. | |
3223 class CMObjectClosure : public ObjectClosure { | |
3224 private: | |
3225 CMTask* _task; | |
3226 | |
3227 public: | |
3228 void do_object(oop obj) { | |
3229 _task->deal_with_reference(obj); | |
3230 } | |
3231 | |
3232 CMObjectClosure(CMTask* task) : _task(task) { } | |
3233 }; | |
3234 | |
3235 // Closure for iterating over object fields | |
3236 class CMOopClosure : public OopClosure { | |
3237 private: | |
3238 G1CollectedHeap* _g1h; | |
3239 ConcurrentMark* _cm; | |
3240 CMTask* _task; | |
3241 | |
3242 public: | |
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3243 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3244 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3245 |
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3246 template <class T> void do_oop_work(T* p) { |
2152 | 3247 assert( _g1h->is_in_g1_reserved((HeapWord*) p), "invariant"); |
2361 | 3248 assert(!_g1h->is_on_master_free_list( |
2152 | 3249 _g1h->heap_region_containing((HeapWord*) p)), "invariant"); |
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3250 |
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3251 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 3252 if (_cm->verbose_high()) |
3253 gclog_or_tty->print_cr("[%d] we're looking at location " | |
3254 "*"PTR_FORMAT" = "PTR_FORMAT, | |
3255 _task->task_id(), p, (void*) obj); | |
3256 _task->deal_with_reference(obj); | |
3257 } | |
3258 | |
3259 CMOopClosure(G1CollectedHeap* g1h, | |
3260 ConcurrentMark* cm, | |
3261 CMTask* task) | |
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3262 : _g1h(g1h), _cm(cm), _task(task) |
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3263 { |
2436 | 3264 assert(_ref_processor == NULL, "should be initialized to NULL"); |
3265 | |
3266 if (G1UseConcMarkReferenceProcessing) { | |
3267 _ref_processor = g1h->ref_processor(); | |
3268 assert(_ref_processor != NULL, "should not be NULL"); | |
3269 } | |
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3270 } |
342 | 3271 }; |
3272 | |
3273 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3274 // Separated the asserts so that we know which one fires. |
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3275 assert(hr != NULL, |
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3276 "claim_region() should have filtered out continues humongous regions"); |
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3277 assert(!hr->continuesHumongous(), |
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3278 "claim_region() should have filtered out continues humongous regions"); |
342 | 3279 |
3280 if (_cm->verbose_low()) | |
3281 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, | |
3282 _task_id, hr); | |
3283 | |
3284 _curr_region = hr; | |
3285 _finger = hr->bottom(); | |
3286 update_region_limit(); | |
3287 } | |
3288 | |
3289 void CMTask::update_region_limit() { | |
3290 HeapRegion* hr = _curr_region; | |
3291 HeapWord* bottom = hr->bottom(); | |
3292 HeapWord* limit = hr->next_top_at_mark_start(); | |
3293 | |
3294 if (limit == bottom) { | |
3295 if (_cm->verbose_low()) | |
3296 gclog_or_tty->print_cr("[%d] found an empty region " | |
3297 "["PTR_FORMAT", "PTR_FORMAT")", | |
3298 _task_id, bottom, limit); | |
3299 // The region was collected underneath our feet. | |
3300 // We set the finger to bottom to ensure that the bitmap | |
3301 // iteration that will follow this will not do anything. | |
3302 // (this is not a condition that holds when we set the region up, | |
3303 // as the region is not supposed to be empty in the first place) | |
3304 _finger = bottom; | |
3305 } else if (limit >= _region_limit) { | |
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3306 assert(limit >= _finger, "peace of mind"); |
342 | 3307 } else { |
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3308 assert(limit < _region_limit, "only way to get here"); |
342 | 3309 // This can happen under some pretty unusual circumstances. An |
3310 // evacuation pause empties the region underneath our feet (NTAMS | |
3311 // at bottom). We then do some allocation in the region (NTAMS | |
3312 // stays at bottom), followed by the region being used as a GC | |
3313 // alloc region (NTAMS will move to top() and the objects | |
3314 // originally below it will be grayed). All objects now marked in | |
3315 // the region are explicitly grayed, if below the global finger, | |
3316 // and we do not need in fact to scan anything else. So, we simply | |
3317 // set _finger to be limit to ensure that the bitmap iteration | |
3318 // doesn't do anything. | |
3319 _finger = limit; | |
3320 } | |
3321 | |
3322 _region_limit = limit; | |
3323 } | |
3324 | |
3325 void CMTask::giveup_current_region() { | |
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3326 assert(_curr_region != NULL, "invariant"); |
342 | 3327 if (_cm->verbose_low()) |
3328 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, | |
3329 _task_id, _curr_region); | |
3330 clear_region_fields(); | |
3331 } | |
3332 | |
3333 void CMTask::clear_region_fields() { | |
3334 // Values for these three fields that indicate that we're not | |
3335 // holding on to a region. | |
3336 _curr_region = NULL; | |
3337 _finger = NULL; | |
3338 _region_limit = NULL; | |
3339 | |
3340 _region_finger = NULL; | |
3341 } | |
3342 | |
3343 void CMTask::reset(CMBitMap* nextMarkBitMap) { | |
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3344 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3345 |
3346 if (_cm->verbose_low()) | |
3347 gclog_or_tty->print_cr("[%d] resetting", _task_id); | |
3348 | |
3349 _nextMarkBitMap = nextMarkBitMap; | |
3350 clear_region_fields(); | |
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3351 assert(_aborted_region.is_empty(), "should have been cleared"); |
342 | 3352 |
3353 _calls = 0; | |
3354 _elapsed_time_ms = 0.0; | |
3355 _termination_time_ms = 0.0; | |
3356 _termination_start_time_ms = 0.0; | |
3357 | |
3358 #if _MARKING_STATS_ | |
3359 _local_pushes = 0; | |
3360 _local_pops = 0; | |
3361 _local_max_size = 0; | |
3362 _objs_scanned = 0; | |
3363 _global_pushes = 0; | |
3364 _global_pops = 0; | |
3365 _global_max_size = 0; | |
3366 _global_transfers_to = 0; | |
3367 _global_transfers_from = 0; | |
3368 _region_stack_pops = 0; | |
3369 _regions_claimed = 0; | |
3370 _objs_found_on_bitmap = 0; | |
3371 _satb_buffers_processed = 0; | |
3372 _steal_attempts = 0; | |
3373 _steals = 0; | |
3374 _aborted = 0; | |
3375 _aborted_overflow = 0; | |
3376 _aborted_cm_aborted = 0; | |
3377 _aborted_yield = 0; | |
3378 _aborted_timed_out = 0; | |
3379 _aborted_satb = 0; | |
3380 _aborted_termination = 0; | |
3381 #endif // _MARKING_STATS_ | |
3382 } | |
3383 | |
3384 bool CMTask::should_exit_termination() { | |
3385 regular_clock_call(); | |
3386 // This is called when we are in the termination protocol. We should | |
3387 // quit if, for some reason, this task wants to abort or the global | |
3388 // stack is not empty (this means that we can get work from it). | |
3389 return !_cm->mark_stack_empty() || has_aborted(); | |
3390 } | |
3391 | |
3392 // This determines whether the method below will check both the local | |
3393 // and global fingers when determining whether to push on the stack a | |
3394 // gray object (value 1) or whether it will only check the global one | |
3395 // (value 0). The tradeoffs are that the former will be a bit more | |
3396 // accurate and possibly push less on the stack, but it might also be | |
3397 // a little bit slower. | |
3398 | |
3399 #define _CHECK_BOTH_FINGERS_ 1 | |
3400 | |
3401 void CMTask::deal_with_reference(oop obj) { | |
3402 if (_cm->verbose_high()) | |
3403 gclog_or_tty->print_cr("[%d] we're dealing with reference = "PTR_FORMAT, | |
3404 _task_id, (void*) obj); | |
3405 | |
3406 ++_refs_reached; | |
3407 | |
3408 HeapWord* objAddr = (HeapWord*) obj; | |
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3409 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); |
342 | 3410 if (_g1h->is_in_g1_reserved(objAddr)) { |
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3411 assert(obj != NULL, "is_in_g1_reserved should ensure this"); |
342 | 3412 HeapRegion* hr = _g1h->heap_region_containing(obj); |
3413 if (_g1h->is_obj_ill(obj, hr)) { | |
3414 if (_cm->verbose_high()) | |
3415 gclog_or_tty->print_cr("[%d] "PTR_FORMAT" is not considered marked", | |
3416 _task_id, (void*) obj); | |
3417 | |
3418 // we need to mark it first | |
3419 if (_nextMarkBitMap->parMark(objAddr)) { | |
3420 // No OrderAccess:store_load() is needed. It is implicit in the | |
3421 // CAS done in parMark(objAddr) above | |
3422 HeapWord* global_finger = _cm->finger(); | |
3423 | |
3424 #if _CHECK_BOTH_FINGERS_ | |
3425 // we will check both the local and global fingers | |
3426 | |
3427 if (_finger != NULL && objAddr < _finger) { | |
3428 if (_cm->verbose_high()) | |
3429 gclog_or_tty->print_cr("[%d] below the local finger ("PTR_FORMAT"), " | |
3430 "pushing it", _task_id, _finger); | |
3431 push(obj); | |
3432 } else if (_curr_region != NULL && objAddr < _region_limit) { | |
3433 // do nothing | |
3434 } else if (objAddr < global_finger) { | |
3435 // Notice that the global finger might be moving forward | |
3436 // concurrently. This is not a problem. In the worst case, we | |
3437 // mark the object while it is above the global finger and, by | |
3438 // the time we read the global finger, it has moved forward | |
3439 // passed this object. In this case, the object will probably | |
3440 // be visited when a task is scanning the region and will also | |
3441 // be pushed on the stack. So, some duplicate work, but no | |
3442 // correctness problems. | |
3443 | |
3444 if (_cm->verbose_high()) | |
3445 gclog_or_tty->print_cr("[%d] below the global finger " | |
3446 "("PTR_FORMAT"), pushing it", | |
3447 _task_id, global_finger); | |
3448 push(obj); | |
3449 } else { | |
3450 // do nothing | |
3451 } | |
3452 #else // _CHECK_BOTH_FINGERS_ | |
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3453 // we will only check the global finger |
342 | 3454 |
3455 if (objAddr < global_finger) { | |
3456 // see long comment above | |
3457 | |
3458 if (_cm->verbose_high()) | |
3459 gclog_or_tty->print_cr("[%d] below the global finger " | |
3460 "("PTR_FORMAT"), pushing it", | |
3461 _task_id, global_finger); | |
3462 push(obj); | |
3463 } | |
3464 #endif // _CHECK_BOTH_FINGERS_ | |
3465 } | |
3466 } | |
3467 } | |
3468 } | |
3469 | |
3470 void CMTask::push(oop obj) { | |
3471 HeapWord* objAddr = (HeapWord*) obj; | |
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3472 assert(_g1h->is_in_g1_reserved(objAddr), "invariant"); |
2361 | 3473 assert(!_g1h->is_on_master_free_list( |
2152 | 3474 _g1h->heap_region_containing((HeapWord*) objAddr)), "invariant"); |
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3475 assert(!_g1h->is_obj_ill(obj), "invariant"); |
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3476 assert(_nextMarkBitMap->isMarked(objAddr), "invariant"); |
342 | 3477 |
3478 if (_cm->verbose_high()) | |
3479 gclog_or_tty->print_cr("[%d] pushing "PTR_FORMAT, _task_id, (void*) obj); | |
3480 | |
3481 if (!_task_queue->push(obj)) { | |
3482 // The local task queue looks full. We need to push some entries | |
3483 // to the global stack. | |
3484 | |
3485 if (_cm->verbose_medium()) | |
3486 gclog_or_tty->print_cr("[%d] task queue overflow, " | |
3487 "moving entries to the global stack", | |
3488 _task_id); | |
3489 move_entries_to_global_stack(); | |
3490 | |
3491 // this should succeed since, even if we overflow the global | |
3492 // stack, we should have definitely removed some entries from the | |
3493 // local queue. So, there must be space on it. | |
3494 bool success = _task_queue->push(obj); | |
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3495 assert(success, "invariant"); |
342 | 3496 } |
3497 | |
3498 statsOnly( int tmp_size = _task_queue->size(); | |
3499 if (tmp_size > _local_max_size) | |
3500 _local_max_size = tmp_size; | |
3501 ++_local_pushes ); | |
3502 } | |
3503 | |
3504 void CMTask::reached_limit() { | |
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3505 assert(_words_scanned >= _words_scanned_limit || |
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3506 _refs_reached >= _refs_reached_limit , |
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3507 "shouldn't have been called otherwise"); |
342 | 3508 regular_clock_call(); |
3509 } | |
3510 | |
3511 void CMTask::regular_clock_call() { | |
3512 if (has_aborted()) | |
3513 return; | |
3514 | |
3515 // First, we need to recalculate the words scanned and refs reached | |
3516 // limits for the next clock call. | |
3517 recalculate_limits(); | |
3518 | |
3519 // During the regular clock call we do the following | |
3520 | |
3521 // (1) If an overflow has been flagged, then we abort. | |
3522 if (_cm->has_overflown()) { | |
3523 set_has_aborted(); | |
3524 return; | |
3525 } | |
3526 | |
3527 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3528 // to check anything else. The other steps are only needed during | |
3529 // the concurrent marking phase. | |
3530 if (!concurrent()) | |
3531 return; | |
3532 | |
3533 // (2) If marking has been aborted for Full GC, then we also abort. | |
3534 if (_cm->has_aborted()) { | |
3535 set_has_aborted(); | |
3536 statsOnly( ++_aborted_cm_aborted ); | |
3537 return; | |
3538 } | |
3539 | |
3540 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3541 | |
3542 // (3) If marking stats are enabled, then we update the step history. | |
3543 #if _MARKING_STATS_ | |
3544 if (_words_scanned >= _words_scanned_limit) | |
3545 ++_clock_due_to_scanning; | |
3546 if (_refs_reached >= _refs_reached_limit) | |
3547 ++_clock_due_to_marking; | |
3548 | |
3549 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3550 _interval_start_time_ms = curr_time_ms; | |
3551 _all_clock_intervals_ms.add(last_interval_ms); | |
3552 | |
3553 if (_cm->verbose_medium()) { | |
3554 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " | |
3555 "scanned = %d%s, refs reached = %d%s", | |
3556 _task_id, last_interval_ms, | |
3557 _words_scanned, | |
3558 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", | |
3559 _refs_reached, | |
3560 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); | |
3561 } | |
3562 #endif // _MARKING_STATS_ | |
3563 | |
3564 // (4) We check whether we should yield. If we have to, then we abort. | |
3565 if (_cm->should_yield()) { | |
3566 // We should yield. To do this we abort the task. The caller is | |
3567 // responsible for yielding. | |
3568 set_has_aborted(); | |
3569 statsOnly( ++_aborted_yield ); | |
3570 return; | |
3571 } | |
3572 | |
3573 // (5) We check whether we've reached our time quota. If we have, | |
3574 // then we abort. | |
3575 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3576 if (elapsed_time_ms > _time_target_ms) { | |
3577 set_has_aborted(); | |
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3578 _has_timed_out = true; |
342 | 3579 statsOnly( ++_aborted_timed_out ); |
3580 return; | |
3581 } | |
3582 | |
3583 // (6) Finally, we check whether there are enough completed STAB | |
3584 // buffers available for processing. If there are, we abort. | |
3585 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3586 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
3587 if (_cm->verbose_low()) | |
3588 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", | |
3589 _task_id); | |
3590 // we do need to process SATB buffers, we'll abort and restart | |
3591 // the marking task to do so | |
3592 set_has_aborted(); | |
3593 statsOnly( ++_aborted_satb ); | |
3594 return; | |
3595 } | |
3596 } | |
3597 | |
3598 void CMTask::recalculate_limits() { | |
3599 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3600 _words_scanned_limit = _real_words_scanned_limit; | |
3601 | |
3602 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3603 _refs_reached_limit = _real_refs_reached_limit; | |
3604 } | |
3605 | |
3606 void CMTask::decrease_limits() { | |
3607 // This is called when we believe that we're going to do an infrequent | |
3608 // operation which will increase the per byte scanned cost (i.e. move | |
3609 // entries to/from the global stack). It basically tries to decrease the | |
3610 // scanning limit so that the clock is called earlier. | |
3611 | |
3612 if (_cm->verbose_medium()) | |
3613 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); | |
3614 | |
3615 _words_scanned_limit = _real_words_scanned_limit - | |
3616 3 * words_scanned_period / 4; | |
3617 _refs_reached_limit = _real_refs_reached_limit - | |
3618 3 * refs_reached_period / 4; | |
3619 } | |
3620 | |
3621 void CMTask::move_entries_to_global_stack() { | |
3622 // local array where we'll store the entries that will be popped | |
3623 // from the local queue | |
3624 oop buffer[global_stack_transfer_size]; | |
3625 | |
3626 int n = 0; | |
3627 oop obj; | |
3628 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3629 buffer[n] = obj; | |
3630 ++n; | |
3631 } | |
3632 | |
3633 if (n > 0) { | |
3634 // we popped at least one entry from the local queue | |
3635 | |
3636 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3637 | |
3638 if (!_cm->mark_stack_push(buffer, n)) { | |
3639 if (_cm->verbose_low()) | |
3640 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", _task_id); | |
3641 set_has_aborted(); | |
3642 } else { | |
3643 // the transfer was successful | |
3644 | |
3645 if (_cm->verbose_medium()) | |
3646 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", | |
3647 _task_id, n); | |
3648 statsOnly( int tmp_size = _cm->mark_stack_size(); | |
3649 if (tmp_size > _global_max_size) | |
3650 _global_max_size = tmp_size; | |
3651 _global_pushes += n ); | |
3652 } | |
3653 } | |
3654 | |
3655 // this operation was quite expensive, so decrease the limits | |
3656 decrease_limits(); | |
3657 } | |
3658 | |
3659 void CMTask::get_entries_from_global_stack() { | |
3660 // local array where we'll store the entries that will be popped | |
3661 // from the global stack. | |
3662 oop buffer[global_stack_transfer_size]; | |
3663 int n; | |
3664 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3665 assert(n <= global_stack_transfer_size, |
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3666 "we should not pop more than the given limit"); |
342 | 3667 if (n > 0) { |
3668 // yes, we did actually pop at least one entry | |
3669 | |
3670 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
3671 if (_cm->verbose_medium()) | |
3672 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", | |
3673 _task_id, n); | |
3674 for (int i = 0; i < n; ++i) { | |
3675 bool success = _task_queue->push(buffer[i]); | |
3676 // We only call this when the local queue is empty or under a | |
3677 // given target limit. So, we do not expect this push to fail. | |
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3678 assert(success, "invariant"); |
342 | 3679 } |
3680 | |
3681 statsOnly( int tmp_size = _task_queue->size(); | |
3682 if (tmp_size > _local_max_size) | |
3683 _local_max_size = tmp_size; | |
3684 _local_pushes += n ); | |
3685 } | |
3686 | |
3687 // this operation was quite expensive, so decrease the limits | |
3688 decrease_limits(); | |
3689 } | |
3690 | |
3691 void CMTask::drain_local_queue(bool partially) { | |
3692 if (has_aborted()) | |
3693 return; | |
3694 | |
3695 // Decide what the target size is, depending whether we're going to | |
3696 // drain it partially (so that other tasks can steal if they run out | |
3697 // of things to do) or totally (at the very end). | |
3698 size_t target_size; | |
3699 if (partially) | |
3700 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); | |
3701 else | |
3702 target_size = 0; | |
3703 | |
3704 if (_task_queue->size() > target_size) { | |
3705 if (_cm->verbose_high()) | |
3706 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", | |
3707 _task_id, target_size); | |
3708 | |
3709 oop obj; | |
3710 bool ret = _task_queue->pop_local(obj); | |
3711 while (ret) { | |
3712 statsOnly( ++_local_pops ); | |
3713 | |
3714 if (_cm->verbose_high()) | |
3715 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, | |
3716 (void*) obj); | |
3717 | |
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3718 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3719 assert(!_g1h->is_on_master_free_list( |
2152 | 3720 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3721 |
3722 scan_object(obj); | |
3723 | |
3724 if (_task_queue->size() <= target_size || has_aborted()) | |
3725 ret = false; | |
3726 else | |
3727 ret = _task_queue->pop_local(obj); | |
3728 } | |
3729 | |
3730 if (_cm->verbose_high()) | |
3731 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", | |
3732 _task_id, _task_queue->size()); | |
3733 } | |
3734 } | |
3735 | |
3736 void CMTask::drain_global_stack(bool partially) { | |
3737 if (has_aborted()) | |
3738 return; | |
3739 | |
3740 // We have a policy to drain the local queue before we attempt to | |
3741 // drain the global stack. | |
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3742 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3743 |
3744 // Decide what the target size is, depending whether we're going to | |
3745 // drain it partially (so that other tasks can steal if they run out | |
3746 // of things to do) or totally (at the very end). Notice that, | |
3747 // because we move entries from the global stack in chunks or | |
3748 // because another task might be doing the same, we might in fact | |
3749 // drop below the target. But, this is not a problem. | |
3750 size_t target_size; | |
3751 if (partially) | |
3752 target_size = _cm->partial_mark_stack_size_target(); | |
3753 else | |
3754 target_size = 0; | |
3755 | |
3756 if (_cm->mark_stack_size() > target_size) { | |
3757 if (_cm->verbose_low()) | |
3758 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", | |
3759 _task_id, target_size); | |
3760 | |
3761 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3762 get_entries_from_global_stack(); | |
3763 drain_local_queue(partially); | |
3764 } | |
3765 | |
3766 if (_cm->verbose_low()) | |
3767 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", | |
3768 _task_id, _cm->mark_stack_size()); | |
3769 } | |
3770 } | |
3771 | |
3772 // SATB Queue has several assumptions on whether to call the par or | |
3773 // non-par versions of the methods. this is why some of the code is | |
3774 // replicated. We should really get rid of the single-threaded version | |
3775 // of the code to simplify things. | |
3776 void CMTask::drain_satb_buffers() { | |
3777 if (has_aborted()) | |
3778 return; | |
3779 | |
3780 // We set this so that the regular clock knows that we're in the | |
3781 // middle of draining buffers and doesn't set the abort flag when it | |
3782 // notices that SATB buffers are available for draining. It'd be | |
3783 // very counter productive if it did that. :-) | |
3784 _draining_satb_buffers = true; | |
3785 | |
3786 CMObjectClosure oc(this); | |
3787 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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3788 if (G1CollectedHeap::use_parallel_gc_threads()) |
342 | 3789 satb_mq_set.set_par_closure(_task_id, &oc); |
3790 else | |
3791 satb_mq_set.set_closure(&oc); | |
3792 | |
3793 // This keeps claiming and applying the closure to completed buffers | |
3794 // until we run out of buffers or we need to abort. | |
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3795 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3796 while (!has_aborted() && |
3797 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
3798 if (_cm->verbose_medium()) | |
3799 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); | |
3800 statsOnly( ++_satb_buffers_processed ); | |
3801 regular_clock_call(); | |
3802 } | |
3803 } else { | |
3804 while (!has_aborted() && | |
3805 satb_mq_set.apply_closure_to_completed_buffer()) { | |
3806 if (_cm->verbose_medium()) | |
3807 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); | |
3808 statsOnly( ++_satb_buffers_processed ); | |
3809 regular_clock_call(); | |
3810 } | |
3811 } | |
3812 | |
3813 if (!concurrent() && !has_aborted()) { | |
3814 // We should only do this during remark. | |
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3815 if (G1CollectedHeap::use_parallel_gc_threads()) |
342 | 3816 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
3817 else | |
3818 satb_mq_set.iterate_closure_all_threads(); | |
3819 } | |
3820 | |
3821 _draining_satb_buffers = false; | |
3822 | |
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3823 assert(has_aborted() || |
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3824 concurrent() || |
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3825 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3826 |
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3827 if (G1CollectedHeap::use_parallel_gc_threads()) |
342 | 3828 satb_mq_set.set_par_closure(_task_id, NULL); |
3829 else | |
3830 satb_mq_set.set_closure(NULL); | |
3831 | |
3832 // again, this was a potentially expensive operation, decrease the | |
3833 // limits to get the regular clock call early | |
3834 decrease_limits(); | |
3835 } | |
3836 | |
3837 void CMTask::drain_region_stack(BitMapClosure* bc) { | |
3838 if (has_aborted()) | |
3839 return; | |
3840 | |
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3841 assert(_region_finger == NULL, |
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3842 "it should be NULL when we're not scanning a region"); |
342 | 3843 |
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3844 if (!_cm->region_stack_empty() || !_aborted_region.is_empty()) { |
342 | 3845 if (_cm->verbose_low()) |
3846 gclog_or_tty->print_cr("[%d] draining region stack, size = %d", | |
3847 _task_id, _cm->region_stack_size()); | |
3848 | |
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3849 MemRegion mr; |
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3850 |
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3851 if (!_aborted_region.is_empty()) { |
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3852 mr = _aborted_region; |
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3853 _aborted_region = MemRegion(); |
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3854 |
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3855 if (_cm->verbose_low()) |
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3856 gclog_or_tty->print_cr("[%d] scanning aborted region [ " PTR_FORMAT ", " PTR_FORMAT " )", |
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3857 _task_id, mr.start(), mr.end()); |
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3858 } else { |
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3859 mr = _cm->region_stack_pop_lock_free(); |
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3860 // it returns MemRegion() if the pop fails |
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3861 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); |
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3862 } |
342 | 3863 |
3864 while (mr.start() != NULL) { | |
3865 if (_cm->verbose_medium()) | |
3866 gclog_or_tty->print_cr("[%d] we are scanning region " | |
3867 "["PTR_FORMAT", "PTR_FORMAT")", | |
3868 _task_id, mr.start(), mr.end()); | |
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3869 |
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3870 assert(mr.end() <= _cm->finger(), |
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3871 "otherwise the region shouldn't be on the stack"); |
342 | 3872 assert(!mr.is_empty(), "Only non-empty regions live on the region stack"); |
3873 if (_nextMarkBitMap->iterate(bc, mr)) { | |
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3874 assert(!has_aborted(), |
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3875 "cannot abort the task without aborting the bitmap iteration"); |
342 | 3876 |
3877 // We finished iterating over the region without aborting. | |
3878 regular_clock_call(); | |
3879 if (has_aborted()) | |
3880 mr = MemRegion(); | |
3881 else { | |
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3882 mr = _cm->region_stack_pop_lock_free(); |
342 | 3883 // it returns MemRegion() if the pop fails |
3884 statsOnly(if (mr.start() != NULL) ++_region_stack_pops ); | |
3885 } | |
3886 } else { | |
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3887 assert(has_aborted(), "currently the only way to do so"); |
342 | 3888 |
3889 // The only way to abort the bitmap iteration is to return | |
3890 // false from the do_bit() method. However, inside the | |
3891 // do_bit() method we move the _region_finger to point to the | |
3892 // object currently being looked at. So, if we bail out, we | |
3893 // have definitely set _region_finger to something non-null. | |
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3894 assert(_region_finger != NULL, "invariant"); |
342 | 3895 |
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3896 // Make sure that any previously aborted region has been |
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3897 // cleared. |
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3898 assert(_aborted_region.is_empty(), "aborted region not cleared"); |
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3899 |
342 | 3900 // The iteration was actually aborted. So now _region_finger |
3901 // points to the address of the object we last scanned. If we | |
3902 // leave it there, when we restart this task, we will rescan | |
3903 // the object. It is easy to avoid this. We move the finger by | |
3904 // enough to point to the next possible object header (the | |
3905 // bitmap knows by how much we need to move it as it knows its | |
3906 // granularity). | |
3907 MemRegion newRegion = | |
3908 MemRegion(_nextMarkBitMap->nextWord(_region_finger), mr.end()); | |
3909 | |
3910 if (!newRegion.is_empty()) { | |
3911 if (_cm->verbose_low()) { | |
1835
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3912 gclog_or_tty->print_cr("[%d] recording unscanned region" |
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3913 "[" PTR_FORMAT "," PTR_FORMAT ") in CMTask", |
342 | 3914 _task_id, |
3915 newRegion.start(), newRegion.end()); | |
3916 } | |
1835
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3917 // Now record the part of the region we didn't scan to |
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3918 // make sure this task scans it later. |
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3919 _aborted_region = newRegion; |
342 | 3920 } |
3921 // break from while | |
3922 mr = MemRegion(); | |
3923 } | |
3924 _region_finger = NULL; | |
3925 } | |
3926 | |
3927 if (_cm->verbose_low()) | |
3928 gclog_or_tty->print_cr("[%d] drained region stack, size = %d", | |
3929 _task_id, _cm->region_stack_size()); | |
3930 } | |
3931 } | |
3932 | |
3933 void CMTask::print_stats() { | |
3934 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
3935 _task_id, _calls); | |
3936 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
3937 _elapsed_time_ms, _termination_time_ms); | |
3938 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3939 _step_times_ms.num(), _step_times_ms.avg(), | |
3940 _step_times_ms.sd()); | |
3941 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3942 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3943 | |
3944 #if _MARKING_STATS_ | |
3945 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3946 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3947 _all_clock_intervals_ms.sd()); | |
3948 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3949 _all_clock_intervals_ms.maximum(), | |
3950 _all_clock_intervals_ms.sum()); | |
3951 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3952 _clock_due_to_scanning, _clock_due_to_marking); | |
3953 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3954 _objs_scanned, _objs_found_on_bitmap); | |
3955 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3956 _local_pushes, _local_pops, _local_max_size); | |
3957 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3958 _global_pushes, _global_pops, _global_max_size); | |
3959 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3960 _global_transfers_to,_global_transfers_from); | |
3961 gclog_or_tty->print_cr(" Regions: claimed = %d, Region Stack: pops = %d", | |
3962 _regions_claimed, _region_stack_pops); | |
3963 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); | |
3964 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3965 _steal_attempts, _steals); | |
3966 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3967 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3968 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3969 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3970 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3971 #endif // _MARKING_STATS_ | |
3972 } | |
3973 | |
3974 /***************************************************************************** | |
3975 | |
3976 The do_marking_step(time_target_ms) method is the building block | |
3977 of the parallel marking framework. It can be called in parallel | |
3978 with other invocations of do_marking_step() on different tasks | |
3979 (but only one per task, obviously) and concurrently with the | |
3980 mutator threads, or during remark, hence it eliminates the need | |
3981 for two versions of the code. When called during remark, it will | |
3982 pick up from where the task left off during the concurrent marking | |
3983 phase. Interestingly, tasks are also claimable during evacuation | |
3984 pauses too, since do_marking_step() ensures that it aborts before | |
3985 it needs to yield. | |
3986 | |
3987 The data structures that is uses to do marking work are the | |
3988 following: | |
3989 | |
3990 (1) Marking Bitmap. If there are gray objects that appear only | |
3991 on the bitmap (this happens either when dealing with an overflow | |
3992 or when the initial marking phase has simply marked the roots | |
3993 and didn't push them on the stack), then tasks claim heap | |
3994 regions whose bitmap they then scan to find gray objects. A | |
3995 global finger indicates where the end of the last claimed region | |
3996 is. A local finger indicates how far into the region a task has | |
3997 scanned. The two fingers are used to determine how to gray an | |
3998 object (i.e. whether simply marking it is OK, as it will be | |
3999 visited by a task in the future, or whether it needs to be also | |
4000 pushed on a stack). | |
4001 | |
4002 (2) Local Queue. The local queue of the task which is accessed | |
4003 reasonably efficiently by the task. Other tasks can steal from | |
4004 it when they run out of work. Throughout the marking phase, a | |
4005 task attempts to keep its local queue short but not totally | |
4006 empty, so that entries are available for stealing by other | |
4007 tasks. Only when there is no more work, a task will totally | |
4008 drain its local queue. | |
4009 | |
4010 (3) Global Mark Stack. This handles local queue overflow. During | |
4011 marking only sets of entries are moved between it and the local | |
4012 queues, as access to it requires a mutex and more fine-grain | |
4013 interaction with it which might cause contention. If it | |
4014 overflows, then the marking phase should restart and iterate | |
4015 over the bitmap to identify gray objects. Throughout the marking | |
4016 phase, tasks attempt to keep the global mark stack at a small | |
4017 length but not totally empty, so that entries are available for | |
4018 popping by other tasks. Only when there is no more work, tasks | |
4019 will totally drain the global mark stack. | |
4020 | |
4021 (4) Global Region Stack. Entries on it correspond to areas of | |
4022 the bitmap that need to be scanned since they contain gray | |
4023 objects. Pushes on the region stack only happen during | |
4024 evacuation pauses and typically correspond to areas covered by | |
4025 GC LABS. If it overflows, then the marking phase should restart | |
4026 and iterate over the bitmap to identify gray objects. Tasks will | |
4027 try to totally drain the region stack as soon as possible. | |
4028 | |
4029 (5) SATB Buffer Queue. This is where completed SATB buffers are | |
4030 made available. Buffers are regularly removed from this queue | |
4031 and scanned for roots, so that the queue doesn't get too | |
4032 long. During remark, all completed buffers are processed, as | |
4033 well as the filled in parts of any uncompleted buffers. | |
4034 | |
4035 The do_marking_step() method tries to abort when the time target | |
4036 has been reached. There are a few other cases when the | |
4037 do_marking_step() method also aborts: | |
4038 | |
4039 (1) When the marking phase has been aborted (after a Full GC). | |
4040 | |
4041 (2) When a global overflow (either on the global stack or the | |
4042 region stack) has been triggered. Before the task aborts, it | |
4043 will actually sync up with the other tasks to ensure that all | |
4044 the marking data structures (local queues, stacks, fingers etc.) | |
4045 are re-initialised so that when do_marking_step() completes, | |
4046 the marking phase can immediately restart. | |
4047 | |
4048 (3) When enough completed SATB buffers are available. The | |
4049 do_marking_step() method only tries to drain SATB buffers right | |
4050 at the beginning. So, if enough buffers are available, the | |
4051 marking step aborts and the SATB buffers are processed at | |
4052 the beginning of the next invocation. | |
4053 | |
4054 (4) To yield. when we have to yield then we abort and yield | |
4055 right at the end of do_marking_step(). This saves us from a lot | |
4056 of hassle as, by yielding we might allow a Full GC. If this | |
4057 happens then objects will be compacted underneath our feet, the | |
4058 heap might shrink, etc. We save checking for this by just | |
4059 aborting and doing the yield right at the end. | |
4060 | |
4061 From the above it follows that the do_marking_step() method should | |
4062 be called in a loop (or, otherwise, regularly) until it completes. | |
4063 | |
4064 If a marking step completes without its has_aborted() flag being | |
4065 true, it means it has completed the current marking phase (and | |
4066 also all other marking tasks have done so and have all synced up). | |
4067 | |
4068 A method called regular_clock_call() is invoked "regularly" (in | |
4069 sub ms intervals) throughout marking. It is this clock method that | |
4070 checks all the abort conditions which were mentioned above and | |
4071 decides when the task should abort. A work-based scheme is used to | |
4072 trigger this clock method: when the number of object words the | |
4073 marking phase has scanned or the number of references the marking | |
4074 phase has visited reach a given limit. Additional invocations to | |
4075 the method clock have been planted in a few other strategic places | |
4076 too. The initial reason for the clock method was to avoid calling | |
4077 vtime too regularly, as it is quite expensive. So, once it was in | |
4078 place, it was natural to piggy-back all the other conditions on it | |
4079 too and not constantly check them throughout the code. | |
4080 | |
4081 *****************************************************************************/ | |
4082 | |
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4083 void CMTask::do_marking_step(double time_target_ms, |
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4084 bool do_stealing, |
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4085 bool do_termination) { |
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4086 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4087 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4088 |
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4089 assert(concurrent() || _cm->region_stack_empty(), |
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4090 "the region stack should have been cleared before remark"); |
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4091 assert(concurrent() || !_cm->has_aborted_regions(), |
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4092 "aborted regions should have been cleared before remark"); |
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4093 assert(_region_finger == NULL, |
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4094 "this should be non-null only when a region is being scanned"); |
342 | 4095 |
4096 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); | |
1023
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4097 assert(_task_queues != NULL, "invariant"); |
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4098 assert(_task_queue != NULL, "invariant"); |
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4099 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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4100 |
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4101 assert(!_claimed, |
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4102 "only one thread should claim this task at any one time"); |
342 | 4103 |
4104 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4105 // possible for two threads to set the _claimed flag at the same | |
4106 // time. But it is only for debugging purposes anyway and it will | |
4107 // catch most problems. | |
4108 _claimed = true; | |
4109 | |
4110 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4111 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4112 | |
4113 double diff_prediction_ms = | |
4114 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4115 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4116 | |
4117 // set up the variables that are used in the work-based scheme to | |
4118 // call the regular clock method | |
4119 _words_scanned = 0; | |
4120 _refs_reached = 0; | |
4121 recalculate_limits(); | |
4122 | |
4123 // clear all flags | |
4124 clear_has_aborted(); | |
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4125 _has_timed_out = false; |
342 | 4126 _draining_satb_buffers = false; |
4127 | |
4128 ++_calls; | |
4129 | |
4130 if (_cm->verbose_low()) | |
4131 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " | |
4132 "target = %1.2lfms >>>>>>>>>>", | |
4133 _task_id, _calls, _time_target_ms); | |
4134 | |
4135 // Set up the bitmap and oop closures. Anything that uses them is | |
4136 // eventually called from this method, so it is OK to allocate these | |
4137 // statically. | |
4138 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
4139 CMOopClosure oop_closure(_g1h, _cm, this); | |
4140 set_oop_closure(&oop_closure); | |
4141 | |
4142 if (_cm->has_overflown()) { | |
4143 // This can happen if the region stack or the mark stack overflows | |
4144 // during a GC pause and this task, after a yield point, | |
4145 // restarts. We have to abort as we need to get into the overflow | |
4146 // protocol which happens right at the end of this task. | |
4147 set_has_aborted(); | |
4148 } | |
4149 | |
4150 // First drain any available SATB buffers. After this, we will not | |
4151 // look at SATB buffers before the next invocation of this method. | |
4152 // If enough completed SATB buffers are queued up, the regular clock | |
4153 // will abort this task so that it restarts. | |
4154 drain_satb_buffers(); | |
4155 // ...then partially drain the local queue and the global stack | |
4156 drain_local_queue(true); | |
4157 drain_global_stack(true); | |
4158 | |
4159 // Then totally drain the region stack. We will not look at | |
4160 // it again before the next invocation of this method. Entries on | |
4161 // the region stack are only added during evacuation pauses, for | |
4162 // which we have to yield. When we do, we abort the task anyway so | |
4163 // it will look at the region stack again when it restarts. | |
4164 bitmap_closure.set_scanning_heap_region(false); | |
4165 drain_region_stack(&bitmap_closure); | |
4166 // ...then partially drain the local queue and the global stack | |
4167 drain_local_queue(true); | |
4168 drain_global_stack(true); | |
4169 | |
4170 do { | |
4171 if (!has_aborted() && _curr_region != NULL) { | |
4172 // This means that we're already holding on to a region. | |
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4173 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4174 "should not be NULL either"); |
342 | 4175 |
4176 // We might have restarted this task after an evacuation pause | |
4177 // which might have evacuated the region we're holding on to | |
4178 // underneath our feet. Let's read its limit again to make sure | |
4179 // that we do not iterate over a region of the heap that | |
4180 // contains garbage (update_region_limit() will also move | |
4181 // _finger to the start of the region if it is found empty). | |
4182 update_region_limit(); | |
4183 // We will start from _finger not from the start of the region, | |
4184 // as we might be restarting this task after aborting half-way | |
4185 // through scanning this region. In this case, _finger points to | |
4186 // the address where we last found a marked object. If this is a | |
4187 // fresh region, _finger points to start(). | |
4188 MemRegion mr = MemRegion(_finger, _region_limit); | |
4189 | |
4190 if (_cm->verbose_low()) | |
4191 gclog_or_tty->print_cr("[%d] we're scanning part " | |
4192 "["PTR_FORMAT", "PTR_FORMAT") " | |
4193 "of region "PTR_FORMAT, | |
4194 _task_id, _finger, _region_limit, _curr_region); | |
4195 | |
4196 // Let's iterate over the bitmap of the part of the | |
4197 // region that is left. | |
4198 bitmap_closure.set_scanning_heap_region(true); | |
4199 if (mr.is_empty() || | |
4200 _nextMarkBitMap->iterate(&bitmap_closure, mr)) { | |
4201 // We successfully completed iterating over the region. Now, | |
4202 // let's give up the region. | |
4203 giveup_current_region(); | |
4204 regular_clock_call(); | |
4205 } else { | |
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4206 assert(has_aborted(), "currently the only way to do so"); |
342 | 4207 // The only way to abort the bitmap iteration is to return |
4208 // false from the do_bit() method. However, inside the | |
4209 // do_bit() method we move the _finger to point to the | |
4210 // object currently being looked at. So, if we bail out, we | |
4211 // have definitely set _finger to something non-null. | |
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4212 assert(_finger != NULL, "invariant"); |
342 | 4213 |
4214 // Region iteration was actually aborted. So now _finger | |
4215 // points to the address of the object we last scanned. If we | |
4216 // leave it there, when we restart this task, we will rescan | |
4217 // the object. It is easy to avoid this. We move the finger by | |
4218 // enough to point to the next possible object header (the | |
4219 // bitmap knows by how much we need to move it as it knows its | |
4220 // granularity). | |
1314
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4221 assert(_finger < _region_limit, "invariant"); |
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4222 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
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4223 // Check if bitmap iteration was aborted while scanning the last object |
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4224 if (new_finger >= _region_limit) { |
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4225 giveup_current_region(); |
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4226 } else { |
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4227 move_finger_to(new_finger); |
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4228 } |
342 | 4229 } |
4230 } | |
4231 // At this point we have either completed iterating over the | |
4232 // region we were holding on to, or we have aborted. | |
4233 | |
4234 // We then partially drain the local queue and the global stack. | |
4235 // (Do we really need this?) | |
4236 drain_local_queue(true); | |
4237 drain_global_stack(true); | |
4238 | |
4239 // Read the note on the claim_region() method on why it might | |
4240 // return NULL with potentially more regions available for | |
4241 // claiming and why we have to check out_of_regions() to determine | |
4242 // whether we're done or not. | |
4243 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4244 // We are going to try to claim a new region. We should have | |
4245 // given up on the previous one. | |
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|
4246 // Separated the asserts so that we know which one fires. |
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|
4247 assert(_curr_region == NULL, "invariant"); |
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|
4248 assert(_finger == NULL, "invariant"); |
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|
4249 assert(_region_limit == NULL, "invariant"); |
342 | 4250 if (_cm->verbose_low()) |
4251 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); | |
4252 HeapRegion* claimed_region = _cm->claim_region(_task_id); | |
4253 if (claimed_region != NULL) { | |
4254 // Yes, we managed to claim one | |
4255 statsOnly( ++_regions_claimed ); | |
4256 | |
4257 if (_cm->verbose_low()) | |
4258 gclog_or_tty->print_cr("[%d] we successfully claimed " | |
4259 "region "PTR_FORMAT, | |
4260 _task_id, claimed_region); | |
4261 | |
4262 setup_for_region(claimed_region); | |
1023
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|
4263 assert(_curr_region == claimed_region, "invariant"); |
342 | 4264 } |
4265 // It is important to call the regular clock here. It might take | |
4266 // a while to claim a region if, for example, we hit a large | |
4267 // block of empty regions. So we need to call the regular clock | |
4268 // method once round the loop to make sure it's called | |
4269 // frequently enough. | |
4270 regular_clock_call(); | |
4271 } | |
4272 | |
4273 if (!has_aborted() && _curr_region == NULL) { | |
1023
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|
4274 assert(_cm->out_of_regions(), |
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|
4275 "at this point we should be out of regions"); |
342 | 4276 } |
4277 } while ( _curr_region != NULL && !has_aborted()); | |
4278 | |
4279 if (!has_aborted()) { | |
4280 // We cannot check whether the global stack is empty, since other | |
343
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
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|
4281 // tasks might be pushing objects to it concurrently. We also cannot |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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diff
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|
4282 // 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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|
4283 // it can push a partially done region back. |
1023
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|
4284 assert(_cm->out_of_regions(), |
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|
4285 "at this point we should be out of regions"); |
342 | 4286 |
4287 if (_cm->verbose_low()) | |
4288 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); | |
4289 | |
4290 // Try to reduce the number of available SATB buffers so that | |
4291 // remark has less work to do. | |
4292 drain_satb_buffers(); | |
4293 } | |
4294 | |
4295 // Since we've done everything else, we can now totally drain the | |
4296 // local queue and global stack. | |
4297 drain_local_queue(false); | |
4298 drain_global_stack(false); | |
4299 | |
4300 // Attempt at work stealing from other task's queues. | |
2174
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|
4301 if (do_stealing && !has_aborted()) { |
342 | 4302 // We have not aborted. This means that we have finished all that |
4303 // we could. Let's try to do some stealing... | |
4304 | |
4305 // 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
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diff
changeset
|
4306 // 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
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342
diff
changeset
|
4307 // 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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|
4308 // it can push a partially done region back. |
1023
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4309 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
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|
4310 "only way to reach here"); |
342 | 4311 |
4312 if (_cm->verbose_low()) | |
4313 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); | |
4314 | |
4315 while (!has_aborted()) { | |
4316 oop obj; | |
4317 statsOnly( ++_steal_attempts ); | |
4318 | |
4319 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
4320 if (_cm->verbose_medium()) | |
4321 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", | |
4322 _task_id, (void*) obj); | |
4323 | |
4324 statsOnly( ++_steals ); | |
4325 | |
1023
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|
4326 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
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|
4327 "any stolen object should be marked"); |
342 | 4328 scan_object(obj); |
4329 | |
4330 // And since we're towards the end, let's totally drain the | |
4331 // local queue and global stack. | |
4332 drain_local_queue(false); | |
4333 drain_global_stack(false); | |
4334 } else { | |
4335 break; | |
4336 } | |
4337 } | |
4338 } | |
4339 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4340 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4341 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4342 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4343 if (_cm->force_overflow()->should_force()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4344 _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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diff
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|
4345 regular_clock_call(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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|
4346 } |
cd8e33b2a8ad
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|
4347 } |
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|
4348 |
342 | 4349 // We still haven't aborted. Now, let's try to get into the |
4350 // termination protocol. | |
2174
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|
4351 if (do_termination && !has_aborted()) { |
342 | 4352 // 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
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342
diff
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|
4353 // tasks might be concurrently pushing objects on it. We also cannot |
afc1ce1efe66
6710665: G1: guarantee(_cm->out_of_regions() && _cm->region_stack_empty() && _task_queue->size() == 0, ...)
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342
diff
changeset
|
4354 // check if the region stack is empty because if a thread is aborting |
afc1ce1efe66
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iveresov
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diff
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|
4355 // it can push a partially done region back. |
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4356 // Separated the asserts so that we know which one fires. |
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|
4357 assert(_cm->out_of_regions(), "only way to reach here"); |
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|
4358 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4359 |
4360 if (_cm->verbose_low()) | |
4361 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); | |
4362 | |
4363 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
4364 // The CMTask class also extends the TerminatorTerminator class, | |
4365 // hence its should_exit_termination() method will also decide | |
4366 // whether to exit the termination protocol or not. | |
4367 bool finished = _cm->terminator()->offer_termination(this); | |
4368 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
4369 _termination_time_ms += | |
4370 termination_end_time_ms - _termination_start_time_ms; | |
4371 | |
4372 if (finished) { | |
4373 // We're all done. | |
4374 | |
4375 if (_task_id == 0) { | |
4376 // let's allow task 0 to do this | |
4377 if (concurrent()) { | |
1023
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|
4378 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4379 // we need to set this to false before the next |
4380 // safepoint. This way we ensure that the marking phase | |
4381 // doesn't observe any more heap expansions. | |
4382 _cm->clear_concurrent_marking_in_progress(); | |
4383 } | |
4384 } | |
4385 | |
4386 // We can now guarantee that the global stack is empty, since | |
1023
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|
4387 // all other tasks have finished. We separated the guarantees so |
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|
4388 // that, if a condition is false, we can immediately find out |
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|
4389 // which one. |
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|
4390 guarantee(_cm->out_of_regions(), "only way to reach here"); |
1835
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|
4391 guarantee(_aborted_region.is_empty(), "only way to reach here"); |
1023
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|
4392 guarantee(_cm->region_stack_empty(), "only way to reach here"); |
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|
4393 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
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|
4394 guarantee(_task_queue->size() == 0, "only way to reach here"); |
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|
4395 guarantee(!_cm->has_overflown(), "only way to reach here"); |
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|
4396 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
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|
4397 guarantee(!_cm->region_stack_overflow(), "only way to reach here"); |
342 | 4398 |
4399 if (_cm->verbose_low()) | |
4400 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); | |
4401 } else { | |
4402 // Apparently there's more work to do. Let's abort this task. It | |
4403 // will restart it and we can hopefully find more things to do. | |
4404 | |
4405 if (_cm->verbose_low()) | |
4406 gclog_or_tty->print_cr("[%d] apparently there is more work to do", _task_id); | |
4407 | |
4408 set_has_aborted(); | |
4409 statsOnly( ++_aborted_termination ); | |
4410 } | |
4411 } | |
4412 | |
4413 // Mainly for debugging purposes to make sure that a pointer to the | |
4414 // closure which was statically allocated in this frame doesn't | |
4415 // escape it by accident. | |
4416 set_oop_closure(NULL); | |
4417 double end_time_ms = os::elapsedVTime() * 1000.0; | |
4418 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4419 // Update the step history. | |
4420 _step_times_ms.add(elapsed_time_ms); | |
4421 | |
4422 if (has_aborted()) { | |
4423 // The task was aborted for some reason. | |
4424 | |
4425 statsOnly( ++_aborted ); | |
4426 | |
2174
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|
4427 if (_has_timed_out) { |
342 | 4428 double diff_ms = elapsed_time_ms - _time_target_ms; |
4429 // Keep statistics of how well we did with respect to hitting | |
4430 // our target only if we actually timed out (if we aborted for | |
4431 // other reasons, then the results might get skewed). | |
4432 _marking_step_diffs_ms.add(diff_ms); | |
4433 } | |
4434 | |
4435 if (_cm->has_overflown()) { | |
4436 // This is the interesting one. We aborted because a global | |
4437 // overflow was raised. This means we have to restart the | |
4438 // marking phase and start iterating over regions. However, in | |
4439 // order to do this we have to make sure that all tasks stop | |
4440 // what they are doing and re-initialise in a safe manner. We | |
4441 // will achieve this with the use of two barrier sync points. | |
4442 | |
4443 if (_cm->verbose_low()) | |
4444 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); | |
4445 | |
4446 _cm->enter_first_sync_barrier(_task_id); | |
4447 // When we exit this sync barrier we know that all tasks have | |
4448 // stopped doing marking work. So, it's now safe to | |
4449 // re-initialise our data structures. At the end of this method, | |
4450 // task 0 will clear the global data structures. | |
4451 | |
4452 statsOnly( ++_aborted_overflow ); | |
4453 | |
4454 // We clear the local state of this task... | |
4455 clear_region_fields(); | |
4456 | |
4457 // ...and enter the second barrier. | |
4458 _cm->enter_second_sync_barrier(_task_id); | |
4459 // At this point everything has bee re-initialised and we're | |
4460 // ready to restart. | |
4461 } | |
4462 | |
4463 if (_cm->verbose_low()) { | |
4464 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
4465 "elapsed = %1.2lfms <<<<<<<<<<", | |
4466 _task_id, _time_target_ms, elapsed_time_ms); | |
4467 if (_cm->has_aborted()) | |
4468 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", | |
4469 _task_id); | |
4470 } | |
4471 } else { | |
4472 if (_cm->verbose_low()) | |
4473 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " | |
4474 "elapsed = %1.2lfms <<<<<<<<<<", | |
4475 _task_id, _time_target_ms, elapsed_time_ms); | |
4476 } | |
4477 | |
4478 _claimed = false; | |
4479 } | |
4480 | |
4481 CMTask::CMTask(int task_id, | |
4482 ConcurrentMark* cm, | |
4483 CMTaskQueue* task_queue, | |
4484 CMTaskQueueSet* task_queues) | |
4485 : _g1h(G1CollectedHeap::heap()), | |
4486 _task_id(task_id), _cm(cm), | |
4487 _claimed(false), | |
4488 _nextMarkBitMap(NULL), _hash_seed(17), | |
4489 _task_queue(task_queue), | |
4490 _task_queues(task_queues), | |
1835
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|
4491 _oop_closure(NULL), |
4805b9f4779e
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|
4492 _aborted_region(MemRegion()) { |
1023
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|
4493 guarantee(task_queue != NULL, "invariant"); |
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|
4494 guarantee(task_queues != NULL, "invariant"); |
342 | 4495 |
4496 statsOnly( _clock_due_to_scanning = 0; | |
4497 _clock_due_to_marking = 0 ); | |
4498 | |
4499 _marking_step_diffs_ms.add(0.5); | |
4500 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4501 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4502 // 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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|
4503 // 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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|
4504 // header for a particular value and they should be kept consistent |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4505 // with the corresponding macro. Also note that most of the macros add |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4506 // 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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|
4507 // easier to compose. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4508 |
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|
4509 // All the output lines are prefixed with this string to be able to |
371bbc844bf1
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diff
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|
4510 // 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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|
4511 #define G1PPRL_LINE_PREFIX "###" |
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|
4512 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4513 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
371bbc844bf1
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|
4514 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4515 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
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|
4516 #else // _LP64 |
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|
4517 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
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|
4518 #endif // _LP64 |
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4519 |
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|
4520 // For per-region info |
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|
4521 #define G1PPRL_TYPE_FORMAT " %-4s" |
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|
4522 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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4523 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
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4524 #define G1PPRL_BYTE_H_FORMAT " %9s" |
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4525 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
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4526 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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|
4527 |
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|
4528 // For summary info |
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|
4529 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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4530 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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4531 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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4532 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4533 |
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|
4534 G1PrintRegionLivenessInfoClosure:: |
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4535 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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4536 : _out(out), |
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4537 _total_used_bytes(0), _total_capacity_bytes(0), |
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4538 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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4539 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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4540 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
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4541 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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4542 MemRegion g1_committed = g1h->g1_committed(); |
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4543 MemRegion g1_reserved = g1h->g1_reserved(); |
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4544 double now = os::elapsedTime(); |
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|
4545 |
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4546 // Print the header of the output. |
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|
4547 _out->cr(); |
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|
4548 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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|
4549 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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|
4550 G1PPRL_SUM_ADDR_FORMAT("committed") |
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4551 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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4552 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
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4553 g1_committed.start(), g1_committed.end(), |
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4554 g1_reserved.start(), g1_reserved.end(), |
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|
4555 HeapRegion::GrainBytes); |
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|
4556 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4557 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4558 G1PPRL_TYPE_H_FORMAT |
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4559 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4560 G1PPRL_BYTE_H_FORMAT |
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|
4561 G1PPRL_BYTE_H_FORMAT |
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4562 G1PPRL_BYTE_H_FORMAT |
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4563 G1PPRL_DOUBLE_H_FORMAT, |
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|
4564 "type", "address-range", |
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4565 "used", "prev-live", "next-live", "gc-eff"); |
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|
4566 } |
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|
4567 |
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4568 // It takes as a parameter a reference to one of the _hum_* fields, it |
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4569 // deduces the corresponding value for a region in a humongous region |
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4570 // series (either the region size, or what's left if the _hum_* field |
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4571 // is < the region size), and updates the _hum_* field accordingly. |
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|
4572 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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|
4573 size_t bytes = 0; |
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4574 // The > 0 check is to deal with the prev and next live bytes which |
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4575 // could be 0. |
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|
4576 if (*hum_bytes > 0) { |
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|
4577 bytes = MIN2((size_t) HeapRegion::GrainBytes, *hum_bytes); |
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|
4578 *hum_bytes -= bytes; |
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|
4579 } |
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|
4580 return bytes; |
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|
4581 } |
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|
4582 |
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|
4583 // It deduces the values for a region in a humongous region series |
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4584 // from the _hum_* fields and updates those accordingly. It assumes |
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|
4585 // that that _hum_* fields have already been set up from the "starts |
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4586 // humongous" region and we visit the regions in address order. |
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|
4587 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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|
4588 size_t* capacity_bytes, |
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|
4589 size_t* prev_live_bytes, |
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|
4590 size_t* next_live_bytes) { |
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|
4591 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
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|
4592 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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|
4593 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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|
4594 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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|
4595 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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|
4596 } |
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|
4597 |
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|
4598 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
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|
4599 const char* type = ""; |
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|
4600 HeapWord* bottom = r->bottom(); |
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|
4601 HeapWord* end = r->end(); |
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|
4602 size_t capacity_bytes = r->capacity(); |
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|
4603 size_t used_bytes = r->used(); |
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|
4604 size_t prev_live_bytes = r->live_bytes(); |
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|
4605 size_t next_live_bytes = r->next_live_bytes(); |
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|
4606 double gc_eff = r->gc_efficiency(); |
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|
4607 if (r->used() == 0) { |
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|
4608 type = "FREE"; |
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|
4609 } else if (r->is_survivor()) { |
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|
4610 type = "SURV"; |
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|
4611 } else if (r->is_young()) { |
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|
4612 type = "EDEN"; |
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|
4613 } else if (r->startsHumongous()) { |
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|
4614 type = "HUMS"; |
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|
4615 |
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|
4616 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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|
4617 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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|
4618 "they should have been zeroed after the last time we used them"); |
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|
4619 // Set up the _hum_* fields. |
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|
4620 _hum_capacity_bytes = capacity_bytes; |
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|
4621 _hum_used_bytes = used_bytes; |
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|
4622 _hum_prev_live_bytes = prev_live_bytes; |
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|
4623 _hum_next_live_bytes = next_live_bytes; |
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|
4624 get_hum_bytes(&used_bytes, &capacity_bytes, |
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|
4625 &prev_live_bytes, &next_live_bytes); |
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|
4626 end = bottom + HeapRegion::GrainWords; |
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|
4627 } else if (r->continuesHumongous()) { |
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|
4628 type = "HUMC"; |
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|
4629 get_hum_bytes(&used_bytes, &capacity_bytes, |
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|
4630 &prev_live_bytes, &next_live_bytes); |
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4631 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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4632 } else { |
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4633 type = "OLD"; |
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4634 } |
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4635 |
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4636 _total_used_bytes += used_bytes; |
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4637 _total_capacity_bytes += capacity_bytes; |
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4638 _total_prev_live_bytes += prev_live_bytes; |
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4639 _total_next_live_bytes += next_live_bytes; |
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4640 |
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4641 // Print a line for this particular region. |
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4642 _out->print_cr(G1PPRL_LINE_PREFIX |
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4643 G1PPRL_TYPE_FORMAT |
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4644 G1PPRL_ADDR_BASE_FORMAT |
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4645 G1PPRL_BYTE_FORMAT |
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4646 G1PPRL_BYTE_FORMAT |
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4647 G1PPRL_BYTE_FORMAT |
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4648 G1PPRL_DOUBLE_FORMAT, |
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4649 type, bottom, end, |
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4650 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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|
4651 |
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|
4652 return false; |
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|
4653 } |
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|
4654 |
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|
4655 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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4656 // Print the footer of the output. |
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4657 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4658 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4659 " SUMMARY" |
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|
4660 G1PPRL_SUM_MB_FORMAT("capacity") |
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4661 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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4662 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
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4663 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
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4664 bytes_to_mb(_total_capacity_bytes), |
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4665 bytes_to_mb(_total_used_bytes), |
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|
4666 perc(_total_used_bytes, _total_capacity_bytes), |
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|
4667 bytes_to_mb(_total_prev_live_bytes), |
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|
4668 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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|
4669 bytes_to_mb(_total_next_live_bytes), |
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|
4670 perc(_total_next_live_bytes, _total_capacity_bytes)); |
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|
4671 _out->cr(); |
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4672 } |