Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 6294:b0fc02623974
exclude TestPrograms from JaCoCo processing
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 28 Aug 2012 13:55:11 +0200 |
parents | a2f7274eb6ef |
children | da91efe96a93 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
3771 | 27 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1Log.hpp" |
3771 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 34 #include "gc_implementation/g1/g1RemSet.hpp" |
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35 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
37 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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38 #include "gc_implementation/shared/vmGCOperations.hpp" |
1972 | 39 #include "memory/genOopClosures.inline.hpp" |
40 #include "memory/referencePolicy.hpp" | |
41 #include "memory/resourceArea.hpp" | |
42 #include "oops/oop.inline.hpp" | |
43 #include "runtime/handles.inline.hpp" | |
44 #include "runtime/java.hpp" | |
6197 | 45 #include "services/memTracker.hpp" |
342 | 46 |
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47 // Concurrent marking bit map wrapper |
342 | 48 |
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49 CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) : |
342 | 50 _bm((uintptr_t*)NULL,0), |
51 _shifter(shifter) { | |
52 _bmStartWord = (HeapWord*)(rs.base()); | |
53 _bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes | |
54 ReservedSpace brs(ReservedSpace::allocation_align_size_up( | |
55 (_bmWordSize >> (_shifter + LogBitsPerByte)) + 1)); | |
56 | |
6197 | 57 MemTracker::record_virtual_memory_type((address)brs.base(), mtGC); |
58 | |
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59 guarantee(brs.is_reserved(), "couldn't allocate concurrent marking bit map"); |
342 | 60 // For now we'll just commit all of the bit map up fromt. |
61 // Later on we'll try to be more parsimonious with swap. | |
62 guarantee(_virtual_space.initialize(brs, brs.size()), | |
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63 "couldn't reseve backing store for concurrent marking bit map"); |
342 | 64 assert(_virtual_space.committed_size() == brs.size(), |
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65 "didn't reserve backing store for all of concurrent marking bit map?"); |
342 | 66 _bm.set_map((uintptr_t*)_virtual_space.low()); |
67 assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >= | |
68 _bmWordSize, "inconsistency in bit map sizing"); | |
69 _bm.set_size(_bmWordSize >> _shifter); | |
70 } | |
71 | |
72 HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr, | |
73 HeapWord* limit) const { | |
74 // First we must round addr *up* to a possible object boundary. | |
75 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
76 HeapWordSize << _shifter); | |
77 size_t addrOffset = heapWordToOffset(addr); | |
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78 if (limit == NULL) { |
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79 limit = _bmStartWord + _bmWordSize; |
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80 } |
342 | 81 size_t limitOffset = heapWordToOffset(limit); |
82 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
83 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
84 assert(nextAddr >= addr, "get_next_one postcondition"); | |
85 assert(nextAddr == limit || isMarked(nextAddr), | |
86 "get_next_one postcondition"); | |
87 return nextAddr; | |
88 } | |
89 | |
90 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(HeapWord* addr, | |
91 HeapWord* limit) const { | |
92 size_t addrOffset = heapWordToOffset(addr); | |
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93 if (limit == NULL) { |
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94 limit = _bmStartWord + _bmWordSize; |
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95 } |
342 | 96 size_t limitOffset = heapWordToOffset(limit); |
97 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
98 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
99 assert(nextAddr >= addr, "get_next_one postcondition"); | |
100 assert(nextAddr == limit || !isMarked(nextAddr), | |
101 "get_next_one postcondition"); | |
102 return nextAddr; | |
103 } | |
104 | |
105 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
106 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
107 return (int) (diff >> _shifter); | |
108 } | |
109 | |
110 #ifndef PRODUCT | |
111 bool CMBitMapRO::covers(ReservedSpace rs) const { | |
112 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); | |
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113 assert(((size_t)_bm.size() * (size_t)(1 << _shifter)) == _bmWordSize, |
342 | 114 "size inconsistency"); |
115 return _bmStartWord == (HeapWord*)(rs.base()) && | |
116 _bmWordSize == rs.size()>>LogHeapWordSize; | |
117 } | |
118 #endif | |
119 | |
120 void CMBitMap::clearAll() { | |
121 _bm.clear(); | |
122 return; | |
123 } | |
124 | |
125 void CMBitMap::markRange(MemRegion mr) { | |
126 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
127 assert(!mr.is_empty(), "unexpected empty region"); | |
128 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
129 ((HeapWord *) mr.end())), | |
130 "markRange memory region end is not card aligned"); | |
131 // convert address range into offset range | |
132 _bm.at_put_range(heapWordToOffset(mr.start()), | |
133 heapWordToOffset(mr.end()), true); | |
134 } | |
135 | |
136 void CMBitMap::clearRange(MemRegion mr) { | |
137 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
138 assert(!mr.is_empty(), "unexpected empty region"); | |
139 // convert address range into offset range | |
140 _bm.at_put_range(heapWordToOffset(mr.start()), | |
141 heapWordToOffset(mr.end()), false); | |
142 } | |
143 | |
144 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
145 HeapWord* end_addr) { | |
146 HeapWord* start = getNextMarkedWordAddress(addr); | |
147 start = MIN2(start, end_addr); | |
148 HeapWord* end = getNextUnmarkedWordAddress(start); | |
149 end = MIN2(end, end_addr); | |
150 assert(start <= end, "Consistency check"); | |
151 MemRegion mr(start, end); | |
152 if (!mr.is_empty()) { | |
153 clearRange(mr); | |
154 } | |
155 return mr; | |
156 } | |
157 | |
158 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
159 _base(NULL), _cm(cm) | |
160 #ifdef ASSERT | |
161 , _drain_in_progress(false) | |
162 , _drain_in_progress_yields(false) | |
163 #endif | |
164 {} | |
165 | |
166 void CMMarkStack::allocate(size_t size) { | |
6197 | 167 _base = NEW_C_HEAP_ARRAY(oop, size, mtGC); |
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168 if (_base == NULL) { |
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169 vm_exit_during_initialization("Failed to allocate CM region mark stack"); |
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170 } |
342 | 171 _index = 0; |
172 _capacity = (jint) size; | |
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173 _saved_index = -1; |
342 | 174 NOT_PRODUCT(_max_depth = 0); |
175 } | |
176 | |
177 CMMarkStack::~CMMarkStack() { | |
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178 if (_base != NULL) { |
6197 | 179 FREE_C_HEAP_ARRAY(oop, _base, mtGC); |
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180 } |
342 | 181 } |
182 | |
183 void CMMarkStack::par_push(oop ptr) { | |
184 while (true) { | |
185 if (isFull()) { | |
186 _overflow = true; | |
187 return; | |
188 } | |
189 // Otherwise... | |
190 jint index = _index; | |
191 jint next_index = index+1; | |
192 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
193 if (res == index) { | |
194 _base[index] = ptr; | |
195 // Note that we don't maintain this atomically. We could, but it | |
196 // doesn't seem necessary. | |
197 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
198 return; | |
199 } | |
200 // Otherwise, we need to try again. | |
201 } | |
202 } | |
203 | |
204 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
205 while (true) { | |
206 if (isFull()) { | |
207 _overflow = true; | |
208 return; | |
209 } | |
210 // Otherwise... | |
211 jint index = _index; | |
212 jint next_index = index + n; | |
213 if (next_index > _capacity) { | |
214 _overflow = true; | |
215 return; | |
216 } | |
217 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
218 if (res == index) { | |
219 for (int i = 0; i < n; i++) { | |
220 int ind = index + i; | |
221 assert(ind < _capacity, "By overflow test above."); | |
222 _base[ind] = ptr_arr[i]; | |
223 } | |
224 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
225 return; | |
226 } | |
227 // Otherwise, we need to try again. | |
228 } | |
229 } | |
230 | |
231 | |
232 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
233 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
234 jint start = _index; | |
235 jint next_index = start + n; | |
236 if (next_index > _capacity) { | |
237 _overflow = true; | |
238 return; | |
239 } | |
240 // Otherwise. | |
241 _index = next_index; | |
242 for (int i = 0; i < n; i++) { | |
243 int ind = start + i; | |
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244 assert(ind < _capacity, "By overflow test above."); |
342 | 245 _base[ind] = ptr_arr[i]; |
246 } | |
247 } | |
248 | |
249 | |
250 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
251 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
252 jint index = _index; | |
253 if (index == 0) { | |
254 *n = 0; | |
255 return false; | |
256 } else { | |
257 int k = MIN2(max, index); | |
258 jint new_ind = index - k; | |
259 for (int j = 0; j < k; j++) { | |
260 ptr_arr[j] = _base[new_ind + j]; | |
261 } | |
262 _index = new_ind; | |
263 *n = k; | |
264 return true; | |
265 } | |
266 } | |
267 | |
268 template<class OopClosureClass> | |
269 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
270 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
271 || SafepointSynchronize::is_at_safepoint(), | |
272 "Drain recursion must be yield-safe."); | |
273 bool res = true; | |
274 debug_only(_drain_in_progress = true); | |
275 debug_only(_drain_in_progress_yields = yield_after); | |
276 while (!isEmpty()) { | |
277 oop newOop = pop(); | |
278 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
279 assert(newOop->is_oop(), "Expected an oop"); | |
280 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
281 "only grey objects on this stack"); | |
282 newOop->oop_iterate(cl); | |
283 if (yield_after && _cm->do_yield_check()) { | |
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284 res = false; |
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285 break; |
342 | 286 } |
287 } | |
288 debug_only(_drain_in_progress = false); | |
289 return res; | |
290 } | |
291 | |
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292 void CMMarkStack::note_start_of_gc() { |
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293 assert(_saved_index == -1, |
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294 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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295 _saved_index = _index; |
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296 } |
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297 |
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298 void CMMarkStack::note_end_of_gc() { |
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299 // This is intentionally a guarantee, instead of an assert. If we |
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300 // accidentally add something to the mark stack during GC, it |
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301 // will be a correctness issue so it's better if we crash. we'll |
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302 // only check this once per GC anyway, so it won't be a performance |
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303 // issue in any way. |
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304 guarantee(_saved_index == _index, |
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305 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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306 _saved_index = -1; |
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307 } |
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308 |
342 | 309 void CMMarkStack::oops_do(OopClosure* f) { |
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310 assert(_saved_index == _index, |
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311 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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312 for (int i = 0; i < _index; i += 1) { |
342 | 313 f->do_oop(&_base[i]); |
314 } | |
315 } | |
316 | |
317 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
318 return (_g1h->is_obj_ill(obj) | |
319 || (_g1h->is_in_permanent(obj) | |
320 && !nextMarkBitMap()->isMarked((HeapWord*)obj))); | |
321 } | |
322 | |
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323 CMRootRegions::CMRootRegions() : |
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324 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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325 _should_abort(false), _next_survivor(NULL) { } |
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326 |
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327 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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328 _young_list = g1h->young_list(); |
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329 _cm = cm; |
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330 } |
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331 |
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332 void CMRootRegions::prepare_for_scan() { |
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333 assert(!scan_in_progress(), "pre-condition"); |
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334 |
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335 // Currently, only survivors can be root regions. |
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336 assert(_next_survivor == NULL, "pre-condition"); |
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337 _next_survivor = _young_list->first_survivor_region(); |
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338 _scan_in_progress = (_next_survivor != NULL); |
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339 _should_abort = false; |
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340 } |
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341 |
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342 HeapRegion* CMRootRegions::claim_next() { |
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343 if (_should_abort) { |
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344 // If someone has set the should_abort flag, we return NULL to |
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345 // force the caller to bail out of their loop. |
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346 return NULL; |
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347 } |
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348 |
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349 // Currently, only survivors can be root regions. |
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350 HeapRegion* res = _next_survivor; |
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351 if (res != NULL) { |
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352 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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353 // Read it again in case it changed while we were waiting for the lock. |
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354 res = _next_survivor; |
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355 if (res != NULL) { |
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356 if (res == _young_list->last_survivor_region()) { |
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357 // We just claimed the last survivor so store NULL to indicate |
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358 // that we're done. |
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359 _next_survivor = NULL; |
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360 } else { |
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361 _next_survivor = res->get_next_young_region(); |
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362 } |
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363 } else { |
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364 // Someone else claimed the last survivor while we were trying |
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365 // to take the lock so nothing else to do. |
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366 } |
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367 } |
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368 assert(res == NULL || res->is_survivor(), "post-condition"); |
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369 |
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370 return res; |
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371 } |
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372 |
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373 void CMRootRegions::scan_finished() { |
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374 assert(scan_in_progress(), "pre-condition"); |
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375 |
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376 // Currently, only survivors can be root regions. |
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377 if (!_should_abort) { |
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378 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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379 } |
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380 _next_survivor = NULL; |
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381 |
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382 { |
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383 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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384 _scan_in_progress = false; |
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385 RootRegionScan_lock->notify_all(); |
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386 } |
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387 } |
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388 |
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389 bool CMRootRegions::wait_until_scan_finished() { |
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390 if (!scan_in_progress()) return false; |
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391 |
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392 { |
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393 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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394 while (scan_in_progress()) { |
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395 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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396 } |
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397 } |
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398 return true; |
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399 } |
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400 |
342 | 401 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
402 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
403 #endif // _MSC_VER | |
404 | |
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405 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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406 return MAX2((n_par_threads + 2) / 4, 1U); |
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407 } |
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408 |
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409 ConcurrentMark::ConcurrentMark(ReservedSpace rs, uint max_regions) : |
342 | 410 _markBitMap1(rs, MinObjAlignment - 1), |
411 _markBitMap2(rs, MinObjAlignment - 1), | |
412 | |
413 _parallel_marking_threads(0), | |
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414 _max_parallel_marking_threads(0), |
342 | 415 _sleep_factor(0.0), |
416 _marking_task_overhead(1.0), | |
417 _cleanup_sleep_factor(0.0), | |
418 _cleanup_task_overhead(1.0), | |
2152 | 419 _cleanup_list("Cleanup List"), |
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420 _region_bm((BitMap::idx_t) max_regions, false /* in_resource_area*/), |
342 | 421 _card_bm((rs.size() + CardTableModRefBS::card_size - 1) >> |
422 CardTableModRefBS::card_shift, | |
423 false /* in_resource_area*/), | |
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424 |
342 | 425 _prevMarkBitMap(&_markBitMap1), |
426 _nextMarkBitMap(&_markBitMap2), | |
427 | |
428 _markStack(this), | |
429 // _finger set in set_non_marking_state | |
430 | |
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431 _max_task_num(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 432 // _active_tasks set in set_non_marking_state |
433 // _tasks set inside the constructor | |
434 _task_queues(new CMTaskQueueSet((int) _max_task_num)), | |
435 _terminator(ParallelTaskTerminator((int) _max_task_num, _task_queues)), | |
436 | |
437 _has_overflown(false), | |
438 _concurrent(false), | |
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439 _has_aborted(false), |
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440 _restart_for_overflow(false), |
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441 _concurrent_marking_in_progress(false), |
342 | 442 |
443 // _verbose_level set below | |
444 | |
445 _init_times(), | |
446 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
447 _cleanup_times(), | |
448 _total_counting_time(0.0), | |
449 _total_rs_scrub_time(0.0), | |
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450 |
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451 _parallel_workers(NULL), |
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452 |
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453 _count_card_bitmaps(NULL), |
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454 _count_marked_bytes(NULL) { |
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455 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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456 if (verbose_level < no_verbose) { |
342 | 457 verbose_level = no_verbose; |
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458 } |
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459 if (verbose_level > high_verbose) { |
342 | 460 verbose_level = high_verbose; |
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461 } |
342 | 462 _verbose_level = verbose_level; |
463 | |
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464 if (verbose_low()) { |
342 | 465 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
466 "heap end = "PTR_FORMAT, _heap_start, _heap_end); | |
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467 } |
342 | 468 |
1284 | 469 _markStack.allocate(MarkStackSize); |
342 | 470 |
471 // Create & start a ConcurrentMark thread. | |
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472 _cmThread = new ConcurrentMarkThread(this); |
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473 assert(cmThread() != NULL, "CM Thread should have been created"); |
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474 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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475 |
342 | 476 _g1h = G1CollectedHeap::heap(); |
477 assert(CGC_lock != NULL, "Where's the CGC_lock?"); | |
478 assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency"); | |
479 assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency"); | |
480 | |
481 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 482 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 483 |
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484 _root_regions.init(_g1h, this); |
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485 |
6197 | 486 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_task_num, mtGC); |
487 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_task_num, mtGC); | |
488 | |
489 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_task_num, mtGC); | |
490 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_task_num, mtGC); | |
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491 |
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492 BitMap::idx_t card_bm_size = _card_bm.size(); |
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493 |
342 | 494 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
495 _active_tasks = _max_task_num; | |
496 for (int i = 0; i < (int) _max_task_num; ++i) { | |
497 CMTaskQueue* task_queue = new CMTaskQueue(); | |
498 task_queue->initialize(); | |
499 _task_queues->register_queue(i, task_queue); | |
500 | |
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501 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
6197 | 502 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, (size_t) max_regions, mtGC); |
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503 |
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504 _tasks[i] = new CMTask(i, this, |
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505 _count_marked_bytes[i], |
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506 &_count_card_bitmaps[i], |
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507 task_queue, _task_queues); |
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508 |
342 | 509 _accum_task_vtime[i] = 0.0; |
510 } | |
511 | |
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512 // Calculate the card number for the bottom of the heap. Used |
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513 // in biasing indexes into the accounting card bitmaps. |
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514 _heap_bottom_card_num = |
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515 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
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516 CardTableModRefBS::card_shift); |
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517 |
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518 // Clear all the liveness counting data |
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519 clear_all_count_data(); |
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520 |
1284 | 521 if (ConcGCThreads > ParallelGCThreads) { |
522 vm_exit_during_initialization("Can't have more ConcGCThreads " | |
342 | 523 "than ParallelGCThreads."); |
524 } | |
525 if (ParallelGCThreads == 0) { | |
526 // if we are not running with any parallel GC threads we will not | |
527 // spawn any marking threads either | |
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528 _parallel_marking_threads = 0; |
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529 _max_parallel_marking_threads = 0; |
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530 _sleep_factor = 0.0; |
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531 _marking_task_overhead = 1.0; |
342 | 532 } else { |
1284 | 533 if (ConcGCThreads > 0) { |
534 // notice that ConcGCThreads overwrites G1MarkingOverheadPercent | |
342 | 535 // if both are set |
536 | |
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537 _parallel_marking_threads = (uint) ConcGCThreads; |
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538 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 539 _sleep_factor = 0.0; |
540 _marking_task_overhead = 1.0; | |
751 | 541 } else if (G1MarkingOverheadPercent > 0) { |
342 | 542 // we will calculate the number of parallel marking threads |
543 // based on a target overhead with respect to the soft real-time | |
544 // goal | |
545 | |
751 | 546 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 547 double overall_cm_overhead = |
751 | 548 (double) MaxGCPauseMillis * marking_overhead / |
549 (double) GCPauseIntervalMillis; | |
342 | 550 double cpu_ratio = 1.0 / (double) os::processor_count(); |
551 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
552 double marking_task_overhead = | |
553 overall_cm_overhead / marking_thread_num * | |
554 (double) os::processor_count(); | |
555 double sleep_factor = | |
556 (1.0 - marking_task_overhead) / marking_task_overhead; | |
557 | |
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558 _parallel_marking_threads = (uint) marking_thread_num; |
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559 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 560 _sleep_factor = sleep_factor; |
561 _marking_task_overhead = marking_task_overhead; | |
562 } else { | |
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563 _parallel_marking_threads = scale_parallel_threads((uint)ParallelGCThreads); |
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564 _max_parallel_marking_threads = _parallel_marking_threads; |
342 | 565 _sleep_factor = 0.0; |
566 _marking_task_overhead = 1.0; | |
567 } | |
568 | |
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569 if (parallel_marking_threads() > 1) { |
342 | 570 _cleanup_task_overhead = 1.0; |
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571 } else { |
342 | 572 _cleanup_task_overhead = marking_task_overhead(); |
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573 } |
342 | 574 _cleanup_sleep_factor = |
575 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
576 | |
577 #if 0 | |
578 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
579 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
580 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
581 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
582 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
583 #endif | |
584 | |
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585 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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586 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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587 _max_parallel_marking_threads, false, true); |
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588 if (_parallel_workers == NULL) { |
342 | 589 vm_exit_during_initialization("Failed necessary allocation."); |
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590 } else { |
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591 _parallel_workers->initialize_workers(); |
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592 } |
342 | 593 } |
594 | |
595 // so that the call below can read a sensible value | |
596 _heap_start = (HeapWord*) rs.base(); | |
597 set_non_marking_state(); | |
598 } | |
599 | |
600 void ConcurrentMark::update_g1_committed(bool force) { | |
601 // If concurrent marking is not in progress, then we do not need to | |
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602 // update _heap_end. |
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603 if (!concurrent_marking_in_progress() && !force) return; |
342 | 604 |
605 MemRegion committed = _g1h->g1_committed(); | |
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606 assert(committed.start() == _heap_start, "start shouldn't change"); |
342 | 607 HeapWord* new_end = committed.end(); |
608 if (new_end > _heap_end) { | |
609 // The heap has been expanded. | |
610 | |
611 _heap_end = new_end; | |
612 } | |
613 // Notice that the heap can also shrink. However, this only happens | |
614 // during a Full GC (at least currently) and the entire marking | |
615 // phase will bail out and the task will not be restarted. So, let's | |
616 // do nothing. | |
617 } | |
618 | |
619 void ConcurrentMark::reset() { | |
620 // Starting values for these two. This should be called in a STW | |
621 // phase. CM will be notified of any future g1_committed expansions | |
622 // will be at the end of evacuation pauses, when tasks are | |
623 // inactive. | |
624 MemRegion committed = _g1h->g1_committed(); | |
625 _heap_start = committed.start(); | |
626 _heap_end = committed.end(); | |
627 | |
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628 // Separated the asserts so that we know which one fires. |
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629 assert(_heap_start != NULL, "heap bounds should look ok"); |
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630 assert(_heap_end != NULL, "heap bounds should look ok"); |
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631 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 632 |
633 // reset all the marking data structures and any necessary flags | |
634 clear_marking_state(); | |
635 | |
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636 if (verbose_low()) { |
342 | 637 gclog_or_tty->print_cr("[global] resetting"); |
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638 } |
342 | 639 |
640 // We do reset all of them, since different phases will use | |
641 // different number of active threads. So, it's easiest to have all | |
642 // of them ready. | |
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643 for (int i = 0; i < (int) _max_task_num; ++i) { |
342 | 644 _tasks[i]->reset(_nextMarkBitMap); |
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645 } |
342 | 646 |
647 // we need this to make sure that the flag is on during the evac | |
648 // pause with initial mark piggy-backed | |
649 set_concurrent_marking_in_progress(); | |
650 } | |
651 | |
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652 void ConcurrentMark::set_phase(uint active_tasks, bool concurrent) { |
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653 assert(active_tasks <= _max_task_num, "we should not have more"); |
342 | 654 |
655 _active_tasks = active_tasks; | |
656 // Need to update the three data structures below according to the | |
657 // number of active threads for this phase. | |
658 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
659 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
660 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
661 | |
662 _concurrent = concurrent; | |
663 // We propagate this to all tasks, not just the active ones. | |
664 for (int i = 0; i < (int) _max_task_num; ++i) | |
665 _tasks[i]->set_concurrent(concurrent); | |
666 | |
667 if (concurrent) { | |
668 set_concurrent_marking_in_progress(); | |
669 } else { | |
670 // We currently assume that the concurrent flag has been set to | |
671 // false before we start remark. At this point we should also be | |
672 // in a STW phase. | |
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673 assert(!concurrent_marking_in_progress(), "invariant"); |
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674 assert(_finger == _heap_end, "only way to get here"); |
342 | 675 update_g1_committed(true); |
676 } | |
677 } | |
678 | |
679 void ConcurrentMark::set_non_marking_state() { | |
680 // We set the global marking state to some default values when we're | |
681 // not doing marking. | |
682 clear_marking_state(); | |
683 _active_tasks = 0; | |
684 clear_concurrent_marking_in_progress(); | |
685 } | |
686 | |
687 ConcurrentMark::~ConcurrentMark() { | |
4735 | 688 // The ConcurrentMark instance is never freed. |
689 ShouldNotReachHere(); | |
342 | 690 } |
691 | |
692 void ConcurrentMark::clearNextBitmap() { | |
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693 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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694 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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695 |
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696 // Make sure that the concurrent mark thread looks to still be in |
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697 // the current cycle. |
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698 guarantee(cmThread()->during_cycle(), "invariant"); |
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699 |
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700 // We are finishing up the current cycle by clearing the next |
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701 // marking bitmap and getting it ready for the next cycle. During |
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702 // this time no other cycle can start. So, let's make sure that this |
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703 // is the case. |
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704 guarantee(!g1h->mark_in_progress(), "invariant"); |
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705 |
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706 // clear the mark bitmap (no grey objects to start with). |
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707 // We need to do this in chunks and offer to yield in between |
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708 // each chunk. |
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709 HeapWord* start = _nextMarkBitMap->startWord(); |
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710 HeapWord* end = _nextMarkBitMap->endWord(); |
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711 HeapWord* cur = start; |
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712 size_t chunkSize = M; |
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713 while (cur < end) { |
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714 HeapWord* next = cur + chunkSize; |
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715 if (next > end) { |
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716 next = end; |
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717 } |
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718 MemRegion mr(cur,next); |
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719 _nextMarkBitMap->clearRange(mr); |
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720 cur = next; |
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721 do_yield_check(); |
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722 |
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723 // Repeat the asserts from above. We'll do them as asserts here to |
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724 // minimize their overhead on the product. However, we'll have |
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725 // them as guarantees at the beginning / end of the bitmap |
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726 // clearing to get some checking in the product. |
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727 assert(cmThread()->during_cycle(), "invariant"); |
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728 assert(!g1h->mark_in_progress(), "invariant"); |
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729 } |
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730 |
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731 // Clear the liveness counting data |
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732 clear_all_count_data(); |
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733 |
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734 // Repeat the asserts from above. |
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735 guarantee(cmThread()->during_cycle(), "invariant"); |
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736 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 737 } |
738 | |
739 class NoteStartOfMarkHRClosure: public HeapRegionClosure { | |
740 public: | |
741 bool doHeapRegion(HeapRegion* r) { | |
742 if (!r->continuesHumongous()) { | |
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743 r->note_start_of_marking(); |
342 | 744 } |
745 return false; | |
746 } | |
747 }; | |
748 | |
749 void ConcurrentMark::checkpointRootsInitialPre() { | |
750 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
751 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
752 | |
753 _has_aborted = false; | |
754 | |
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755 #ifndef PRODUCT |
1044 | 756 if (G1PrintReachableAtInitialMark) { |
1388 | 757 print_reachable("at-cycle-start", |
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758 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 759 } |
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760 #endif |
342 | 761 |
762 // Initialise marking structures. This has to be done in a STW phase. | |
763 reset(); | |
4787
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764 |
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765 // For each region note start of marking. |
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766 NoteStartOfMarkHRClosure startcl; |
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767 g1h->heap_region_iterate(&startcl); |
342 | 768 } |
769 | |
770 | |
771 void ConcurrentMark::checkpointRootsInitialPost() { | |
772 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
773 | |
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774 // If we force an overflow during remark, the remark operation will |
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775 // actually abort and we'll restart concurrent marking. If we always |
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776 // force an oveflow during remark we'll never actually complete the |
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777 // marking phase. So, we initilize this here, at the start of the |
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778 // cycle, so that at the remaining overflow number will decrease at |
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779 // every remark and we'll eventually not need to cause one. |
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780 force_overflow_stw()->init(); |
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781 |
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782 // Start Concurrent Marking weak-reference discovery. |
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783 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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784 // enable ("weak") refs discovery |
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785 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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786 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 787 |
788 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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789 // This is the start of the marking cycle, we're expected all |
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790 // threads to have SATB queues with active set to false. |
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791 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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792 false /* expected_active */); |
342 | 793 |
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794 _root_regions.prepare_for_scan(); |
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795 |
342 | 796 // update_g1_committed() will be called at the end of an evac pause |
797 // when marking is on. So, it's also called at the end of the | |
798 // initial-mark pause to update the heap end, if the heap expands | |
799 // during it. No need to call it here. | |
800 } | |
801 | |
802 /* | |
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803 * Notice that in the next two methods, we actually leave the STS |
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804 * during the barrier sync and join it immediately afterwards. If we |
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805 * do not do this, the following deadlock can occur: one thread could |
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806 * be in the barrier sync code, waiting for the other thread to also |
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807 * sync up, whereas another one could be trying to yield, while also |
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808 * waiting for the other threads to sync up too. |
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809 * |
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810 * Note, however, that this code is also used during remark and in |
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811 * this case we should not attempt to leave / enter the STS, otherwise |
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812 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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813 * (product). So we should only leave / enter the STS if we are |
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814 * operating concurrently. |
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815 * |
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816 * Because the thread that does the sync barrier has left the STS, it |
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817 * is possible to be suspended for a Full GC or an evacuation pause |
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818 * could occur. This is actually safe, since the entering the sync |
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819 * barrier is one of the last things do_marking_step() does, and it |
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820 * doesn't manipulate any data structures afterwards. |
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821 */ |
342 | 822 |
823 void ConcurrentMark::enter_first_sync_barrier(int task_num) { | |
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824 if (verbose_low()) { |
342 | 825 gclog_or_tty->print_cr("[%d] entering first barrier", task_num); |
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826 } |
342 | 827 |
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828 if (concurrent()) { |
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829 ConcurrentGCThread::stsLeave(); |
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830 } |
342 | 831 _first_overflow_barrier_sync.enter(); |
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832 if (concurrent()) { |
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833 ConcurrentGCThread::stsJoin(); |
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834 } |
342 | 835 // at this point everyone should have synced up and not be doing any |
836 // more work | |
837 | |
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838 if (verbose_low()) { |
342 | 839 gclog_or_tty->print_cr("[%d] leaving first barrier", task_num); |
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840 } |
342 | 841 |
842 // let task 0 do this | |
843 if (task_num == 0) { | |
844 // task 0 is responsible for clearing the global data structures | |
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845 // We should be here because of an overflow. During STW we should |
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846 // not clear the overflow flag since we rely on it being true when |
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847 // we exit this method to abort the pause and restart concurent |
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848 // marking. |
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849 clear_marking_state(concurrent() /* clear_overflow */); |
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850 force_overflow()->update(); |
342 | 851 |
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852 if (G1Log::fine()) { |
342 | 853 gclog_or_tty->date_stamp(PrintGCDateStamps); |
854 gclog_or_tty->stamp(PrintGCTimeStamps); | |
855 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); | |
856 } | |
857 } | |
858 | |
859 // after this, each task should reset its own data structures then | |
860 // then go into the second barrier | |
861 } | |
862 | |
863 void ConcurrentMark::enter_second_sync_barrier(int task_num) { | |
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864 if (verbose_low()) { |
342 | 865 gclog_or_tty->print_cr("[%d] entering second barrier", task_num); |
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866 } |
342 | 867 |
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868 if (concurrent()) { |
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869 ConcurrentGCThread::stsLeave(); |
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870 } |
342 | 871 _second_overflow_barrier_sync.enter(); |
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872 if (concurrent()) { |
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873 ConcurrentGCThread::stsJoin(); |
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874 } |
342 | 875 // at this point everything should be re-initialised and ready to go |
876 | |
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877 if (verbose_low()) { |
342 | 878 gclog_or_tty->print_cr("[%d] leaving second barrier", task_num); |
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879 } |
342 | 880 } |
881 | |
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882 #ifndef PRODUCT |
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883 void ForceOverflowSettings::init() { |
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884 _num_remaining = G1ConcMarkForceOverflow; |
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885 _force = false; |
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886 update(); |
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887 } |
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888 |
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889 void ForceOverflowSettings::update() { |
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890 if (_num_remaining > 0) { |
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891 _num_remaining -= 1; |
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892 _force = true; |
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893 } else { |
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894 _force = false; |
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895 } |
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896 } |
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897 |
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898 bool ForceOverflowSettings::should_force() { |
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899 if (_force) { |
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900 _force = false; |
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901 return true; |
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902 } else { |
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903 return false; |
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904 } |
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905 } |
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906 #endif // !PRODUCT |
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907 |
342 | 908 class CMConcurrentMarkingTask: public AbstractGangTask { |
909 private: | |
910 ConcurrentMark* _cm; | |
911 ConcurrentMarkThread* _cmt; | |
912 | |
913 public: | |
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914 void work(uint worker_id) { |
1023
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915 assert(Thread::current()->is_ConcurrentGC_thread(), |
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916 "this should only be done by a conc GC thread"); |
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917 ResourceMark rm; |
342 | 918 |
919 double start_vtime = os::elapsedVTime(); | |
920 | |
921 ConcurrentGCThread::stsJoin(); | |
922 | |
4728
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923 assert(worker_id < _cm->active_tasks(), "invariant"); |
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924 CMTask* the_task = _cm->task(worker_id); |
342 | 925 the_task->record_start_time(); |
926 if (!_cm->has_aborted()) { | |
927 do { | |
928 double start_vtime_sec = os::elapsedVTime(); | |
929 double start_time_sec = os::elapsedTime(); | |
2174
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930 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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931 |
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932 the_task->do_marking_step(mark_step_duration_ms, |
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933 true /* do_stealing */, |
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934 true /* do_termination */); |
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935 |
342 | 936 double end_time_sec = os::elapsedTime(); |
937 double end_vtime_sec = os::elapsedVTime(); | |
938 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
939 double elapsed_time_sec = end_time_sec - start_time_sec; | |
940 _cm->clear_has_overflown(); | |
941 | |
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942 bool ret = _cm->do_yield_check(worker_id); |
342 | 943 |
944 jlong sleep_time_ms; | |
945 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
946 sleep_time_ms = | |
947 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
948 ConcurrentGCThread::stsLeave(); | |
949 os::sleep(Thread::current(), sleep_time_ms, false); | |
950 ConcurrentGCThread::stsJoin(); | |
951 } | |
952 double end_time2_sec = os::elapsedTime(); | |
953 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
954 | |
955 #if 0 | |
956 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
957 "overhead %1.4lf", | |
958 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
959 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
960 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
961 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
962 #endif | |
963 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
964 } | |
965 the_task->record_end_time(); | |
1023
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966 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 967 |
968 ConcurrentGCThread::stsLeave(); | |
969 | |
970 double end_vtime = os::elapsedVTime(); | |
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971 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 972 } |
973 | |
974 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
975 ConcurrentMarkThread* cmt) : | |
976 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
977 | |
978 ~CMConcurrentMarkingTask() { } | |
979 }; | |
980 | |
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981 // Calculates the number of active workers for a concurrent |
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982 // phase. |
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983 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 984 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4728
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985 uint n_conc_workers = 0; |
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986 if (!UseDynamicNumberOfGCThreads || |
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987 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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988 !ForceDynamicNumberOfGCThreads)) { |
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989 n_conc_workers = max_parallel_marking_threads(); |
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990 } else { |
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991 n_conc_workers = |
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992 AdaptiveSizePolicy::calc_default_active_workers( |
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993 max_parallel_marking_threads(), |
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994 1, /* Minimum workers */ |
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995 parallel_marking_threads(), |
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996 Threads::number_of_non_daemon_threads()); |
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997 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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998 // that scaling has already gone into "_max_parallel_marking_threads". |
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999 } |
4711 | 1000 assert(n_conc_workers > 0, "Always need at least 1"); |
1001 return n_conc_workers; | |
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1002 } |
4711 | 1003 // If we are not running with any parallel GC threads we will not |
1004 // have spawned any marking threads either. Hence the number of | |
1005 // concurrent workers should be 0. | |
1006 return 0; | |
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1007 } |
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1008 |
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1009 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1010 // Currently, only survivors can be root regions. |
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1011 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1012 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1013 |
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1014 const uintx interval = PrefetchScanIntervalInBytes; |
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1015 HeapWord* curr = hr->bottom(); |
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1016 const HeapWord* end = hr->top(); |
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1017 while (curr < end) { |
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1018 Prefetch::read(curr, interval); |
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1019 oop obj = oop(curr); |
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1020 int size = obj->oop_iterate(&cl); |
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1021 assert(size == obj->size(), "sanity"); |
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1022 curr += size; |
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1023 } |
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1024 } |
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1025 |
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1026 class CMRootRegionScanTask : public AbstractGangTask { |
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1027 private: |
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1028 ConcurrentMark* _cm; |
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1029 |
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1030 public: |
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1031 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1032 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1033 |
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1034 void work(uint worker_id) { |
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1035 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1036 "this should only be done by a conc GC thread"); |
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1037 |
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1038 CMRootRegions* root_regions = _cm->root_regions(); |
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1039 HeapRegion* hr = root_regions->claim_next(); |
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1040 while (hr != NULL) { |
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1041 _cm->scanRootRegion(hr, worker_id); |
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1042 hr = root_regions->claim_next(); |
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1043 } |
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1044 } |
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1045 }; |
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1046 |
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1047 void ConcurrentMark::scanRootRegions() { |
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1048 // scan_in_progress() will have been set to true only if there was |
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1049 // at least one root region to scan. So, if it's false, we |
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1050 // should not attempt to do any further work. |
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1051 if (root_regions()->scan_in_progress()) { |
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1052 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1053 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1054 "Maximum number of marking threads exceeded"); |
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1055 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1056 |
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1057 CMRootRegionScanTask task(this); |
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1058 if (parallel_marking_threads() > 0) { |
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1059 _parallel_workers->set_active_workers((int) active_workers); |
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1060 _parallel_workers->run_task(&task); |
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1061 } else { |
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1062 task.work(0); |
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1063 } |
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1064 |
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1065 // It's possible that has_aborted() is true here without actually |
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1066 // aborting the survivor scan earlier. This is OK as it's |
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1067 // mainly used for sanity checking. |
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1068 root_regions()->scan_finished(); |
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1069 } |
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1070 } |
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1071 |
342 | 1072 void ConcurrentMark::markFromRoots() { |
1073 // we might be tempted to assert that: | |
1074 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1075 // "inconsistent argument?"); | |
1076 // However that wouldn't be right, because it's possible that | |
1077 // a safepoint is indeed in progress as a younger generation | |
1078 // stop-the-world GC happens even as we mark in this generation. | |
1079 | |
1080 _restart_for_overflow = false; | |
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1081 force_overflow_conc()->init(); |
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1082 |
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1083 // _g1h has _n_par_threads |
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1084 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1085 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1086 "Maximum number of marking threads exceeded"); |
4711 | 1087 |
4728
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1088 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1089 |
1090 // Parallel task terminator is set in "set_phase()" | |
1091 set_phase(active_workers, true /* concurrent */); | |
342 | 1092 |
1093 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1094 if (parallel_marking_threads() > 0) { |
4711 | 1095 _parallel_workers->set_active_workers((int)active_workers); |
1096 // Don't set _n_par_threads because it affects MT in proceess_strong_roots() | |
1097 // and the decisions on that MT processing is made elsewhere. | |
1098 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1099 _parallel_workers->run_task(&markingTask); |
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1100 } else { |
342 | 1101 markingTask.work(0); |
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1102 } |
342 | 1103 print_stats(); |
1104 } | |
1105 | |
1106 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1107 // world is stopped at this checkpoint | |
1108 assert(SafepointSynchronize::is_at_safepoint(), | |
1109 "world should be stopped"); | |
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1110 |
342 | 1111 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1112 | |
1113 // If a full collection has happened, we shouldn't do this. | |
1114 if (has_aborted()) { | |
1115 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1116 return; | |
1117 } | |
1118 | |
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1119 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1120 |
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1121 if (VerifyDuringGC) { |
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1122 HandleMark hm; // handle scope |
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1123 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1124 Universe::heap()->prepare_for_verify(); |
6008 | 1125 Universe::verify(/* silent */ false, |
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1126 /* option */ VerifyOption_G1UsePrevMarking); |
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1127 } |
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1128 |
342 | 1129 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1130 g1p->record_concurrent_mark_remark_start(); | |
1131 | |
1132 double start = os::elapsedTime(); | |
1133 | |
1134 checkpointRootsFinalWork(); | |
1135 | |
1136 double mark_work_end = os::elapsedTime(); | |
1137 | |
1138 weakRefsWork(clear_all_soft_refs); | |
1139 | |
1140 if (has_overflown()) { | |
1141 // Oops. We overflowed. Restart concurrent marking. | |
1142 _restart_for_overflow = true; | |
1143 // Clear the flag. We do not need it any more. | |
1144 clear_has_overflown(); | |
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1145 if (G1TraceMarkStackOverflow) { |
342 | 1146 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1147 } |
342 | 1148 } else { |
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1149 // Aggregate the per-task counting data that we have accumulated |
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1150 // while marking. |
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1151 aggregate_count_data(); |
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1152 |
2149 | 1153 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1154 // We're done with marking. |
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1155 // This is the end of the marking cycle, we're expected all |
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1156 // threads to have SATB queues with active set to true. |
2149 | 1157 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1158 true /* expected_active */); | |
811 | 1159 |
1160 if (VerifyDuringGC) { | |
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1161 HandleMark hm; // handle scope |
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1162 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1163 Universe::heap()->prepare_for_verify(); |
6008 | 1164 Universe::verify(/* silent */ false, |
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1165 /* option */ VerifyOption_G1UseNextMarking); |
811 | 1166 } |
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1167 assert(!restart_for_overflow(), "sanity"); |
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1168 } |
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1169 |
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1170 // Reset the marking state if marking completed |
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1171 if (!restart_for_overflow()) { |
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1172 set_non_marking_state(); |
342 | 1173 } |
1174 | |
1175 #if VERIFY_OBJS_PROCESSED | |
1176 _scan_obj_cl.objs_processed = 0; | |
1177 ThreadLocalObjQueue::objs_enqueued = 0; | |
1178 #endif | |
1179 | |
1180 // Statistics | |
1181 double now = os::elapsedTime(); | |
1182 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1183 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1184 _remark_times.add((now - start) * 1000.0); | |
1185 | |
1186 g1p->record_concurrent_mark_remark_end(); | |
1187 } | |
1188 | |
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1189 // Base class of the closures that finalize and verify the |
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1190 // liveness counting data. |
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1191 class CMCountDataClosureBase: public HeapRegionClosure { |
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1192 protected: |
342 | 1193 ConcurrentMark* _cm; |
1194 BitMap* _region_bm; | |
1195 BitMap* _card_bm; | |
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1196 |
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1197 void set_card_bitmap_range(BitMap::idx_t start_idx, BitMap::idx_t last_idx) { |
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1198 assert(start_idx <= last_idx, "sanity"); |
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1199 |
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1200 // Set the inclusive bit range [start_idx, last_idx]. |
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1201 // For small ranges (up to 8 cards) use a simple loop; otherwise |
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1202 // use par_at_put_range. |
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1203 if ((last_idx - start_idx) < 8) { |
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1204 for (BitMap::idx_t i = start_idx; i <= last_idx; i += 1) { |
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1205 _card_bm->par_set_bit(i); |
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1206 } |
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1207 } else { |
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1208 assert(last_idx < _card_bm->size(), "sanity"); |
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1209 // Note BitMap::par_at_put_range() is exclusive. |
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1210 _card_bm->par_at_put_range(start_idx, last_idx+1, true); |
342 | 1211 } |
1212 } | |
1213 | |
829 | 1214 // It takes a region that's not empty (i.e., it has at least one |
1215 // live object in it and sets its corresponding bit on the region | |
1216 // bitmap to 1. If the region is "starts humongous" it will also set | |
1217 // to 1 the bits on the region bitmap that correspond to its | |
1218 // associated "continues humongous" regions. | |
1219 void set_bit_for_region(HeapRegion* hr) { | |
1220 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1221 | |
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1222 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
829 | 1223 if (!hr->startsHumongous()) { |
1224 // Normal (non-humongous) case: just set the bit. | |
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1225 _region_bm->par_at_put(index, true); |
829 | 1226 } else { |
1227 // Starts humongous case: calculate how many regions are part of | |
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1228 // this humongous region and then set the bit range. |
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1229 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
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1230 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1231 } |
1232 } | |
1233 | |
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1234 public: |
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1235 CMCountDataClosureBase(ConcurrentMark *cm, |
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1236 BitMap* region_bm, BitMap* card_bm): |
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1237 _cm(cm), _region_bm(region_bm), _card_bm(card_bm) { } |
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1238 }; |
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1239 |
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1240 // Closure that calculates the # live objects per region. Used |
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1241 // for verification purposes during the cleanup pause. |
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1242 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1243 CMBitMapRO* _bm; |
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1244 size_t _region_marked_bytes; |
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1245 |
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1246 public: |
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1247 CalcLiveObjectsClosure(CMBitMapRO *bm, ConcurrentMark *cm, |
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1248 BitMap* region_bm, BitMap* card_bm) : |
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1249 CMCountDataClosureBase(cm, region_bm, card_bm), |
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1250 _bm(bm), _region_marked_bytes(0) { } |
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1251 |
342 | 1252 bool doHeapRegion(HeapRegion* hr) { |
1253 | |
639 | 1254 if (hr->continuesHumongous()) { |
829 | 1255 // We will ignore these here and process them when their |
1256 // associated "starts humongous" region is processed (see | |
1257 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1258 // associated "starts humongous" region to have their bit set to | |
1259 // 1 since, due to the region chunking in the parallel region | |
1260 // iteration, a "continues humongous" region might be visited | |
1261 // before its associated "starts humongous". | |
639 | 1262 return false; |
1263 } | |
342 | 1264 |
1265 HeapWord* nextTop = hr->next_top_at_mark_start(); | |
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1266 HeapWord* start = hr->bottom(); |
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1267 |
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1268 assert(start <= hr->end() && start <= nextTop && nextTop <= hr->end(), |
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1269 err_msg("Preconditions not met - " |
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1270 "start: "PTR_FORMAT", nextTop: "PTR_FORMAT", end: "PTR_FORMAT, |
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1271 start, nextTop, hr->end())); |
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1272 |
342 | 1273 // Find the first marked object at or after "start". |
1274 start = _bm->getNextMarkedWordAddress(start, nextTop); | |
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1275 |
342 | 1276 size_t marked_bytes = 0; |
1277 | |
1278 while (start < nextTop) { | |
1279 oop obj = oop(start); | |
1280 int obj_sz = obj->size(); | |
1281 HeapWord* obj_last = start + obj_sz - 1; | |
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1282 |
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1283 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1284 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(obj_last); |
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1285 |
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1286 // Set the bits in the card BM for this object (inclusive). |
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1287 set_card_bitmap_range(start_idx, last_idx); |
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1288 |
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1289 // Add the size of this object to the number of marked bytes. |
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1290 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1291 |
342 | 1292 // Find the next marked object after this one. |
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1293 start = _bm->getNextMarkedWordAddress(obj_last + 1, nextTop); |
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1294 } |
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1295 |
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1296 // Mark the allocated-since-marking portion... |
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1297 HeapWord* top = hr->top(); |
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1298 if (nextTop < top) { |
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1299 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(nextTop); |
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1300 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top - 1); |
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1301 |
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1302 set_card_bitmap_range(start_idx, last_idx); |
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1303 |
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1304 // This definitely means the region has live objects. |
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1305 set_bit_for_region(hr); |
342 | 1306 } |
1307 | |
1308 // Update the live region bitmap. | |
1309 if (marked_bytes > 0) { | |
829 | 1310 set_bit_for_region(hr); |
342 | 1311 } |
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1312 |
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1313 // Set the marked bytes for the current region so that |
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1314 // it can be queried by a calling verificiation routine |
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1315 _region_marked_bytes = marked_bytes; |
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1316 |
342 | 1317 return false; |
1318 } | |
1319 | |
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1320 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1321 }; |
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1322 |
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1323 // Heap region closure used for verifying the counting data |
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1324 // that was accumulated concurrently and aggregated during |
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1325 // the remark pause. This closure is applied to the heap |
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1326 // regions during the STW cleanup pause. |
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1327 |
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1328 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1329 ConcurrentMark* _cm; |
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1330 CalcLiveObjectsClosure _calc_cl; |
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1331 BitMap* _region_bm; // Region BM to be verified |
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1332 BitMap* _card_bm; // Card BM to be verified |
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1333 bool _verbose; // verbose output? |
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1334 |
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1335 BitMap* _exp_region_bm; // Expected Region BM values |
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1336 BitMap* _exp_card_bm; // Expected card BM values |
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1337 |
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1338 int _failures; |
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1339 |
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1340 public: |
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1341 VerifyLiveObjectDataHRClosure(ConcurrentMark* cm, |
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1342 BitMap* region_bm, |
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1343 BitMap* card_bm, |
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1344 BitMap* exp_region_bm, |
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1345 BitMap* exp_card_bm, |
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1346 bool verbose) : |
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1347 _cm(cm), |
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1348 _calc_cl(_cm->nextMarkBitMap(), _cm, exp_region_bm, exp_card_bm), |
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1349 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1350 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1351 _failures(0) { } |
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1352 |
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1353 int failures() const { return _failures; } |
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1354 |
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1355 bool doHeapRegion(HeapRegion* hr) { |
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1356 if (hr->continuesHumongous()) { |
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1357 // We will ignore these here and process them when their |
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1358 // associated "starts humongous" region is processed (see |
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1359 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1360 // associated "starts humongous" region to have their bit set to |
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1361 // 1 since, due to the region chunking in the parallel region |
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1362 // iteration, a "continues humongous" region might be visited |
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1363 // before its associated "starts humongous". |
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1364 return false; |
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1365 } |
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1366 |
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1367 int failures = 0; |
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1368 |
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1369 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1370 // this region and set the corresponding bits in the expected region |
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1371 // and card bitmaps. |
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1372 bool res = _calc_cl.doHeapRegion(hr); |
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1373 assert(res == false, "should be continuing"); |
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1374 |
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1375 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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1376 Mutex::_no_safepoint_check_flag); |
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1377 |
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1378 // Verify the marked bytes for this region. |
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1379 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1380 size_t act_marked_bytes = hr->next_marked_bytes(); |
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1381 |
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1382 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1383 // we have missed accounting some objects during the actual marking. |
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1384 if (exp_marked_bytes > act_marked_bytes) { |
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1385 if (_verbose) { |
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1386 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
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1387 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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1388 hr->hrs_index(), exp_marked_bytes, act_marked_bytes); |
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1389 } |
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1390 failures += 1; |
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1391 } |
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1392 |
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1393 // Verify the bit, for this region, in the actual and expected |
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1394 // (which was just calculated) region bit maps. |
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1395 // We're not OK if the bit in the calculated expected region |
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1396 // bitmap is set and the bit in the actual region bitmap is not. |
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1397 BitMap::idx_t index = (BitMap::idx_t) hr->hrs_index(); |
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1398 |
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1399 bool expected = _exp_region_bm->at(index); |
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1400 bool actual = _region_bm->at(index); |
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1401 if (expected && !actual) { |
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1402 if (_verbose) { |
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1403 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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1404 "expected: %s, actual: %s", |
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1405 hr->hrs_index(), |
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1406 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1407 } |
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1408 failures += 1; |
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1409 } |
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1410 |
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1411 // Verify that the card bit maps for the cards spanned by the current |
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1412 // region match. We have an error if we have a set bit in the expected |
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1413 // bit map and the corresponding bit in the actual bitmap is not set. |
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1414 |
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1415 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1416 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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1417 |
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1418 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1419 expected = _exp_card_bm->at(i); |
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1420 actual = _card_bm->at(i); |
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1421 |
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1422 if (expected && !actual) { |
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1423 if (_verbose) { |
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1424 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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1425 "expected: %s, actual: %s", |
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1426 hr->hrs_index(), i, |
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1427 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1428 } |
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1429 failures += 1; |
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1430 } |
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1431 } |
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1432 |
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1433 if (failures > 0 && _verbose) { |
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1434 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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1435 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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1436 HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start(), |
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1437 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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1438 } |
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1439 |
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1440 _failures += failures; |
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1441 |
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1442 // We could stop iteration over the heap when we |
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1443 // find the first violating region by returning true. |
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1444 return false; |
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1445 } |
342 | 1446 }; |
1447 | |
1448 | |
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1449 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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1450 protected: |
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1451 G1CollectedHeap* _g1h; |
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1452 ConcurrentMark* _cm; |
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1453 BitMap* _actual_region_bm; |
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1454 BitMap* _actual_card_bm; |
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1455 |
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1456 uint _n_workers; |
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1457 |
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1458 BitMap* _expected_region_bm; |
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1459 BitMap* _expected_card_bm; |
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1460 |
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1461 int _failures; |
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1462 bool _verbose; |
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1463 |
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1464 public: |
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1465 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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1466 BitMap* region_bm, BitMap* card_bm, |
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1467 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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1468 : AbstractGangTask("G1 verify final counting"), |
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1469 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1470 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1471 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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1472 _failures(0), _verbose(false), |
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1473 _n_workers(0) { |
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1474 assert(VerifyDuringGC, "don't call this otherwise"); |
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1475 |
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1476 // Use the value already set as the number of active threads |
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1477 // in the call to run_task(). |
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1478 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1479 assert( _g1h->workers()->active_workers() > 0, |
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1480 "Should have been previously set"); |
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1481 _n_workers = _g1h->workers()->active_workers(); |
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1482 } else { |
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1483 _n_workers = 1; |
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1484 } |
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1485 |
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1486 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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1487 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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1488 |
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1489 _verbose = _cm->verbose_medium(); |
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1490 } |
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|
1491 |
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1492 void work(uint worker_id) { |
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1493 assert(worker_id < _n_workers, "invariant"); |
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1494 |
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1495 VerifyLiveObjectDataHRClosure verify_cl(_cm, |
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1496 _actual_region_bm, _actual_card_bm, |
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1497 _expected_region_bm, |
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1498 _expected_card_bm, |
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1499 _verbose); |
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|
1500 |
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1501 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1502 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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1503 worker_id, |
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1504 _n_workers, |
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|
1505 HeapRegion::VerifyCountClaimValue); |
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1506 } else { |
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1507 _g1h->heap_region_iterate(&verify_cl); |
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1508 } |
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|
1509 |
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1510 Atomic::add(verify_cl.failures(), &_failures); |
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1511 } |
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|
1512 |
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1513 int failures() const { return _failures; } |
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1514 }; |
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1515 |
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1516 // Closure that finalizes the liveness counting data. |
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1517 // Used during the cleanup pause. |
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1518 // Sets the bits corresponding to the interval [NTAMS, top] |
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1519 // (which contains the implicitly live objects) in the |
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1520 // card liveness bitmap. Also sets the bit for each region, |
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1521 // containing live data, in the region liveness bitmap. |
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|
1522 |
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|
1523 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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1524 public: |
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1525 FinalCountDataUpdateClosure(ConcurrentMark* cm, |
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|
1526 BitMap* region_bm, |
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1527 BitMap* card_bm) : |
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1528 CMCountDataClosureBase(cm, region_bm, card_bm) { } |
4836
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|
1529 |
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|
1530 bool doHeapRegion(HeapRegion* hr) { |
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|
1531 |
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1532 if (hr->continuesHumongous()) { |
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1533 // We will ignore these here and process them when their |
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1534 // associated "starts humongous" region is processed (see |
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1535 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1536 // associated "starts humongous" region to have their bit set to |
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1537 // 1 since, due to the region chunking in the parallel region |
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1538 // iteration, a "continues humongous" region might be visited |
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1539 // before its associated "starts humongous". |
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|
1540 return false; |
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|
1541 } |
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|
1542 |
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|
1543 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1544 HeapWord* top = hr->top(); |
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1545 |
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1546 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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|
1547 |
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1548 // Mark the allocated-since-marking portion... |
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1549 if (ntams < top) { |
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1550 // This definitely means the region has live objects. |
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1551 set_bit_for_region(hr); |
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|
1552 } |
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|
1553 |
6027
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|
1554 // Now set the bits for [ntams, top] |
8a2e5a6a19a4
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|
1555 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
4836
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1556 BitMap::idx_t last_idx = _cm->card_bitmap_index_for(top); |
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1557 set_card_bitmap_range(start_idx, last_idx); |
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|
1558 |
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|
1559 // Set the bit for the region if it contains live data |
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|
1560 if (hr->next_marked_bytes() > 0) { |
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1561 set_bit_for_region(hr); |
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|
1562 } |
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|
1563 |
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|
1564 return false; |
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|
1565 } |
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|
1566 }; |
342 | 1567 |
1568 class G1ParFinalCountTask: public AbstractGangTask { | |
1569 protected: | |
1570 G1CollectedHeap* _g1h; | |
4836
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1571 ConcurrentMark* _cm; |
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|
1572 BitMap* _actual_region_bm; |
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1573 BitMap* _actual_card_bm; |
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1574 |
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1575 uint _n_workers; |
4836
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1576 |
342 | 1577 public: |
4836
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1578 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1579 : AbstractGangTask("G1 final counting"), |
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1580 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1581 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1582 _n_workers(0) { |
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1583 // Use the value already set as the number of active threads |
6011 | 1584 // in the call to run_task(). |
4095
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1585 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1586 assert( _g1h->workers()->active_workers() > 0, |
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|
1587 "Should have been previously set"); |
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|
1588 _n_workers = _g1h->workers()->active_workers(); |
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|
1589 } else { |
342 | 1590 _n_workers = 1; |
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1591 } |
342 | 1592 } |
1593 | |
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|
1594 void work(uint worker_id) { |
4836
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|
1595 assert(worker_id < _n_workers, "invariant"); |
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|
1596 |
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|
1597 FinalCountDataUpdateClosure final_update_cl(_cm, |
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|
1598 _actual_region_bm, |
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|
1599 _actual_card_bm); |
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|
1600 |
1833
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|
1601 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4836
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1602 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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|
1603 worker_id, |
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|
1604 _n_workers, |
355 | 1605 HeapRegion::FinalCountClaimValue); |
342 | 1606 } else { |
4836
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1607 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1608 } |
1609 } | |
1610 }; | |
1611 | |
1612 class G1ParNoteEndTask; | |
1613 | |
1614 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1615 G1CollectedHeap* _g1; | |
1616 int _worker_num; | |
1617 size_t _max_live_bytes; | |
6010
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1618 uint _regions_claimed; |
342 | 1619 size_t _freed_bytes; |
2173 | 1620 FreeRegionList* _local_cleanup_list; |
4072 | 1621 OldRegionSet* _old_proxy_set; |
2173 | 1622 HumongousRegionSet* _humongous_proxy_set; |
1623 HRRSCleanupTask* _hrrs_cleanup_task; | |
342 | 1624 double _claimed_region_time; |
1625 double _max_region_time; | |
1626 | |
1627 public: | |
1628 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1629 int worker_num, |
1630 FreeRegionList* local_cleanup_list, | |
4072 | 1631 OldRegionSet* old_proxy_set, |
2173 | 1632 HumongousRegionSet* humongous_proxy_set, |
4093
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|
1633 HRRSCleanupTask* hrrs_cleanup_task) : |
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|
1634 _g1(g1), _worker_num(worker_num), |
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|
1635 _max_live_bytes(0), _regions_claimed(0), |
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|
1636 _freed_bytes(0), |
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|
1637 _claimed_region_time(0.0), _max_region_time(0.0), |
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|
1638 _local_cleanup_list(local_cleanup_list), |
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|
1639 _old_proxy_set(old_proxy_set), |
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|
1640 _humongous_proxy_set(humongous_proxy_set), |
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|
1641 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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|
1642 |
342 | 1643 size_t freed_bytes() { return _freed_bytes; } |
1644 | |
4093
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|
1645 bool doHeapRegion(HeapRegion *hr) { |
6254
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1646 if (hr->continuesHumongous()) { |
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|
1647 return false; |
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|
1648 } |
4093
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|
1649 // We use a claim value of zero here because all regions |
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|
1650 // were claimed with value 1 in the FinalCount task. |
6254
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|
1651 _g1->reset_gc_time_stamps(hr); |
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|
1652 double start = os::elapsedTime(); |
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|
1653 _regions_claimed++; |
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|
1654 hr->note_end_of_marking(); |
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|
1655 _max_live_bytes += hr->max_live_bytes(); |
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|
1656 _g1->free_region_if_empty(hr, |
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|
1657 &_freed_bytes, |
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|
1658 _local_cleanup_list, |
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|
1659 _old_proxy_set, |
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|
1660 _humongous_proxy_set, |
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|
1661 _hrrs_cleanup_task, |
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|
1662 true /* par */); |
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|
1663 double region_time = (os::elapsedTime() - start); |
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|
1664 _claimed_region_time += region_time; |
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|
1665 if (region_time > _max_region_time) { |
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|
1666 _max_region_time = region_time; |
4093
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|
1667 } |
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|
1668 return false; |
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|
1669 } |
342 | 1670 |
1671 size_t max_live_bytes() { return _max_live_bytes; } | |
6010
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|
1672 uint regions_claimed() { return _regions_claimed; } |
342 | 1673 double claimed_region_time_sec() { return _claimed_region_time; } |
1674 double max_region_time_sec() { return _max_region_time; } | |
1675 }; | |
1676 | |
1677 class G1ParNoteEndTask: public AbstractGangTask { | |
1678 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1679 |
342 | 1680 protected: |
1681 G1CollectedHeap* _g1h; | |
1682 size_t _max_live_bytes; | |
1683 size_t _freed_bytes; | |
2152 | 1684 FreeRegionList* _cleanup_list; |
1685 | |
342 | 1686 public: |
1687 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1688 FreeRegionList* cleanup_list) : |
342 | 1689 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1690 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1691 |
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|
1692 void work(uint worker_id) { |
342 | 1693 double start = os::elapsedTime(); |
2173 | 1694 FreeRegionList local_cleanup_list("Local Cleanup List"); |
4072 | 1695 OldRegionSet old_proxy_set("Local Cleanup Old Proxy Set"); |
2173 | 1696 HumongousRegionSet humongous_proxy_set("Local Cleanup Humongous Proxy Set"); |
1697 HRRSCleanupTask hrrs_cleanup_task; | |
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|
1698 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, worker_id, &local_cleanup_list, |
4072 | 1699 &old_proxy_set, |
2173 | 1700 &humongous_proxy_set, |
1701 &hrrs_cleanup_task); | |
1833
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|
1702 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1703 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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|
1704 _g1h->workers()->active_workers(), |
355 | 1705 HeapRegion::NoteEndClaimValue); |
342 | 1706 } else { |
1707 _g1h->heap_region_iterate(&g1_note_end); | |
1708 } | |
1709 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1710 | |
2152 | 1711 // Now update the lists |
1712 _g1h->update_sets_after_freeing_regions(g1_note_end.freed_bytes(), | |
1713 NULL /* free_list */, | |
4072 | 1714 &old_proxy_set, |
2173 | 1715 &humongous_proxy_set, |
2152 | 1716 true /* par */); |
342 | 1717 { |
1718 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
1719 _max_live_bytes += g1_note_end.max_live_bytes(); | |
1720 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1721 |
3778
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1722 // If we iterate over the global cleanup list at the end of |
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|
1723 // cleanup to do this printing we will not guarantee to only |
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|
1724 // generate output for the newly-reclaimed regions (the list |
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1725 // might not be empty at the beginning of cleanup; we might |
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|
1726 // still be working on its previous contents). So we do the |
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|
1727 // printing here, before we append the new regions to the global |
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|
1728 // cleanup list. |
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|
1729 |
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|
1730 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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|
1731 if (hr_printer->is_active()) { |
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|
1732 HeapRegionLinkedListIterator iter(&local_cleanup_list); |
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1733 while (iter.more_available()) { |
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1734 HeapRegion* hr = iter.get_next(); |
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1735 hr_printer->cleanup(hr); |
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1736 } |
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1737 } |
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1738 |
2173 | 1739 _cleanup_list->add_as_tail(&local_cleanup_list); |
1740 assert(local_cleanup_list.is_empty(), "post-condition"); | |
1741 | |
1742 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1743 } |
1744 } | |
1745 size_t max_live_bytes() { return _max_live_bytes; } | |
1746 size_t freed_bytes() { return _freed_bytes; } | |
1747 }; | |
1748 | |
1749 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1750 protected: | |
1751 G1RemSet* _g1rs; | |
1752 BitMap* _region_bm; | |
1753 BitMap* _card_bm; | |
1754 public: | |
1755 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1756 BitMap* region_bm, BitMap* card_bm) : | |
1757 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1758 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1759 |
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1760 void work(uint worker_id) { |
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1761 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1762 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1763 HeapRegion::ScrubRemSetClaimValue); |
342 | 1764 } else { |
1765 _g1rs->scrub(_region_bm, _card_bm); | |
1766 } | |
1767 } | |
1768 | |
1769 }; | |
1770 | |
1771 void ConcurrentMark::cleanup() { | |
1772 // world is stopped at this checkpoint | |
1773 assert(SafepointSynchronize::is_at_safepoint(), | |
1774 "world should be stopped"); | |
1775 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1776 | |
1777 // If a full collection has happened, we shouldn't do this. | |
1778 if (has_aborted()) { | |
1779 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1780 return; | |
1781 } | |
1782 | |
4072 | 1783 HRSPhaseSetter x(HRSPhaseCleanup); |
2152 | 1784 g1h->verify_region_sets_optional(); |
1785 | |
845
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1786 if (VerifyDuringGC) { |
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1787 HandleMark hm; // handle scope |
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1788 gclog_or_tty->print(" VerifyDuringGC:(before)"); |
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1789 Universe::heap()->prepare_for_verify(); |
6008 | 1790 Universe::verify(/* silent */ false, |
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1791 /* option */ VerifyOption_G1UsePrevMarking); |
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1792 } |
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1793 |
342 | 1794 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
1795 g1p->record_concurrent_mark_cleanup_start(); | |
1796 | |
1797 double start = os::elapsedTime(); | |
1798 | |
2173 | 1799 HeapRegionRemSet::reset_for_cleanup_tasks(); |
1800 | |
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1801 uint n_workers; |
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1802 |
342 | 1803 // Do counting once more with the world stopped for good measure. |
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1804 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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1805 |
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1806 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1807 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 1808 "sanity check"); |
1809 | |
4711 | 1810 g1h->set_par_threads(); |
1811 n_workers = g1h->n_par_threads(); | |
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1812 assert(g1h->n_par_threads() == n_workers, |
4711 | 1813 "Should not have been reset"); |
342 | 1814 g1h->workers()->run_task(&g1_par_count_task); |
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1815 // Done with the parallel phase so reset to 0. |
342 | 1816 g1h->set_par_threads(0); |
355 | 1817 |
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1818 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 1819 "sanity check"); |
342 | 1820 } else { |
4711 | 1821 n_workers = 1; |
342 | 1822 g1_par_count_task.work(0); |
1823 } | |
1824 | |
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1825 if (VerifyDuringGC) { |
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1826 // Verify that the counting data accumulated during marking matches |
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1827 // that calculated by walking the marking bitmap. |
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1828 |
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1829 // Bitmaps to hold expected values |
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1830 BitMap expected_region_bm(_region_bm.size(), false); |
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1831 BitMap expected_card_bm(_card_bm.size(), false); |
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1832 |
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1833 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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1834 &_region_bm, |
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1835 &_card_bm, |
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1836 &expected_region_bm, |
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1837 &expected_card_bm); |
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1838 |
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1839 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1840 g1h->set_par_threads((int)n_workers); |
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1841 g1h->workers()->run_task(&g1_par_verify_task); |
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1842 // Done with the parallel phase so reset to 0. |
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1843 g1h->set_par_threads(0); |
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1844 |
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1845 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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1846 "sanity check"); |
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1847 } else { |
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1848 g1_par_verify_task.work(0); |
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1849 } |
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1850 |
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1851 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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1852 } |
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1853 |
342 | 1854 size_t start_used_bytes = g1h->used(); |
1855 g1h->set_marking_complete(); | |
1856 | |
1857 double count_end = os::elapsedTime(); | |
1858 double this_final_counting_time = (count_end - start); | |
1859 _total_counting_time += this_final_counting_time; | |
1860 | |
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1861 if (G1PrintRegionLivenessInfo) { |
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1862 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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1863 _g1h->heap_region_iterate(&cl); |
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1864 } |
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1865 |
342 | 1866 // Install newly created mark bitMap as "prev". |
1867 swapMarkBitMaps(); | |
1868 | |
1869 g1h->reset_gc_time_stamp(); | |
1870 | |
1871 // Note end of marking in all heap regions. | |
2152 | 1872 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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1873 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1874 g1h->set_par_threads((int)n_workers); |
342 | 1875 g1h->workers()->run_task(&g1_par_note_end_task); |
1876 g1h->set_par_threads(0); | |
355 | 1877 |
1878 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
1879 "sanity check"); | |
342 | 1880 } else { |
1881 g1_par_note_end_task.work(0); | |
1882 } | |
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1883 g1h->check_gc_time_stamps(); |
2152 | 1884 |
1885 if (!cleanup_list_is_empty()) { | |
1886 // The cleanup list is not empty, so we'll have to process it | |
1887 // concurrently. Notify anyone else that might be wanting free | |
1888 // regions that there will be more free regions coming soon. | |
1889 g1h->set_free_regions_coming(); | |
1890 } | |
342 | 1891 |
1892 // call below, since it affects the metric by which we sort the heap | |
1893 // regions. | |
1894 if (G1ScrubRemSets) { | |
1895 double rs_scrub_start = os::elapsedTime(); | |
1896 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
1833
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1897 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1898 g1h->set_par_threads((int)n_workers); |
342 | 1899 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
1900 g1h->set_par_threads(0); | |
355 | 1901 |
1902 assert(g1h->check_heap_region_claim_values( | |
1903 HeapRegion::ScrubRemSetClaimValue), | |
1904 "sanity check"); | |
342 | 1905 } else { |
1906 g1_par_scrub_rs_task.work(0); | |
1907 } | |
1908 | |
1909 double rs_scrub_end = os::elapsedTime(); | |
1910 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
1911 _total_rs_scrub_time += this_rs_scrub_time; | |
1912 } | |
1913 | |
1914 // this will also free any regions totally full of garbage objects, | |
1915 // and sort the regions. | |
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1916 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 1917 |
1918 // Statistics. | |
1919 double end = os::elapsedTime(); | |
1920 _cleanup_times.add((end - start) * 1000.0); | |
1921 | |
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1922 if (G1Log::fine()) { |
342 | 1923 g1h->print_size_transition(gclog_or_tty, |
1924 start_used_bytes, | |
1925 g1h->used(), | |
1926 g1h->capacity()); | |
1927 } | |
1928 | |
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1929 // Clean up will have freed any regions completely full of garbage. |
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1930 // Update the soft reference policy with the new heap occupancy. |
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1931 Universe::update_heap_info_at_gc(); |
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1932 |
342 | 1933 // We need to make this be a "collection" so any collection pause that |
1934 // races with it goes around and waits for completeCleanup to finish. | |
1935 g1h->increment_total_collections(); | |
1936 | |
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1937 // We reclaimed old regions so we should calculate the sizes to make |
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1938 // sure we update the old gen/space data. |
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1939 g1h->g1mm()->update_sizes(); |
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1940 |
751 | 1941 if (VerifyDuringGC) { |
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1942 HandleMark hm; // handle scope |
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1943 gclog_or_tty->print(" VerifyDuringGC:(after)"); |
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1944 Universe::heap()->prepare_for_verify(); |
6008 | 1945 Universe::verify(/* silent */ false, |
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1946 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 1947 } |
2152 | 1948 |
1949 g1h->verify_region_sets_optional(); | |
342 | 1950 } |
1951 | |
1952 void ConcurrentMark::completeCleanup() { | |
1953 if (has_aborted()) return; | |
1954 | |
2152 | 1955 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1956 | |
1957 _cleanup_list.verify_optional(); | |
2361 | 1958 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 1959 |
1960 if (G1ConcRegionFreeingVerbose) { | |
1961 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
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1962 "cleanup list has %u entries", |
2152 | 1963 _cleanup_list.length()); |
1964 } | |
1965 | |
1966 // Noone else should be accessing the _cleanup_list at this point, | |
1967 // so it's not necessary to take any locks | |
1968 while (!_cleanup_list.is_empty()) { | |
1969 HeapRegion* hr = _cleanup_list.remove_head(); | |
1970 assert(hr != NULL, "the list was not empty"); | |
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1971 hr->par_clear(); |
2361 | 1972 tmp_free_list.add_as_tail(hr); |
2152 | 1973 |
1974 // Instead of adding one region at a time to the secondary_free_list, | |
1975 // we accumulate them in the local list and move them a few at a | |
1976 // time. This also cuts down on the number of notify_all() calls | |
1977 // we do during this process. We'll also append the local list when | |
1978 // _cleanup_list is empty (which means we just removed the last | |
1979 // region from the _cleanup_list). | |
2361 | 1980 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 1981 _cleanup_list.is_empty()) { |
1982 if (G1ConcRegionFreeingVerbose) { | |
1983 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
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1984 "appending %u entries to the secondary_free_list, " |
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1985 "cleanup list still has %u entries", |
2361 | 1986 tmp_free_list.length(), |
2152 | 1987 _cleanup_list.length()); |
342 | 1988 } |
2152 | 1989 |
1990 { | |
1991 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
2361 | 1992 g1h->secondary_free_list_add_as_tail(&tmp_free_list); |
2152 | 1993 SecondaryFreeList_lock->notify_all(); |
1994 } | |
1995 | |
1996 if (G1StressConcRegionFreeing) { | |
1997 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
1998 os::sleep(Thread::current(), (jlong) 1, false); | |
1999 } | |
2000 } | |
342 | 2001 } |
2002 } | |
2361 | 2003 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2004 } |
2005 | |
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2006 // Support closures for reference procssing in G1 |
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2007 |
2037
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2008 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
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2009 HeapWord* addr = (HeapWord*)obj; |
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2010 return addr != NULL && |
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2011 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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2012 } |
342 | 2013 |
2014 class G1CMKeepAliveClosure: public OopClosure { | |
2015 G1CollectedHeap* _g1; | |
2016 ConcurrentMark* _cm; | |
2017 public: | |
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2018 G1CMKeepAliveClosure(G1CollectedHeap* g1, ConcurrentMark* cm) : |
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2019 _g1(g1), _cm(cm) { |
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2020 assert(Thread::current()->is_VM_thread(), "otherwise fix worker id"); |
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2021 } |
342 | 2022 |
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2023 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2024 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2025 |
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2026 template <class T> void do_oop_work(T* p) { |
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2027 oop obj = oopDesc::load_decode_heap_oop(p); |
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2028 HeapWord* addr = (HeapWord*)obj; |
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2029 |
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2030 if (_cm->verbose_high()) { |
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2031 gclog_or_tty->print_cr("\t[0] we're looking at location " |
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2032 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2033 p, (void*) obj); |
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2034 } |
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2035 |
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2036 if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(obj)) { |
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2037 _cm->mark_and_count(obj); |
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2038 _cm->mark_stack_push(obj); |
342 | 2039 } |
2040 } | |
2041 }; | |
2042 | |
2043 class G1CMDrainMarkingStackClosure: public VoidClosure { | |
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2044 ConcurrentMark* _cm; |
342 | 2045 CMMarkStack* _markStack; |
2046 G1CMKeepAliveClosure* _oopClosure; | |
2047 public: | |
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2048 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMMarkStack* markStack, |
342 | 2049 G1CMKeepAliveClosure* oopClosure) : |
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2050 _cm(cm), |
342 | 2051 _markStack(markStack), |
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2052 _oopClosure(oopClosure) { } |
342 | 2053 |
2054 void do_void() { | |
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2055 _markStack->drain((OopClosure*)_oopClosure, _cm->nextMarkBitMap(), false); |
342 | 2056 } |
2057 }; | |
2058 | |
2174
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2059 // 'Keep Alive' closure used by parallel reference processing. |
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2060 // An instance of this closure is used in the parallel reference processing |
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2061 // code rather than an instance of G1CMKeepAliveClosure. We could have used |
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2062 // the G1CMKeepAliveClosure as it is MT-safe. Also reference objects are |
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2063 // placed on to discovered ref lists once so we can mark and push with no |
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2064 // need to check whether the object has already been marked. Using the |
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2065 // G1CMKeepAliveClosure would mean, however, having all the worker threads |
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2066 // operating on the global mark stack. This means that an individual |
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2067 // worker would be doing lock-free pushes while it processes its own |
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2068 // discovered ref list followed by drain call. If the discovered ref lists |
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2069 // are unbalanced then this could cause interference with the other |
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2070 // workers. Using a CMTask (and its embedded local data structures) |
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2071 // avoids that potential interference. |
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2072 class G1CMParKeepAliveAndDrainClosure: public OopClosure { |
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2073 ConcurrentMark* _cm; |
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2074 CMTask* _task; |
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2075 int _ref_counter_limit; |
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2076 int _ref_counter; |
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2077 public: |
4093
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2078 G1CMParKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task) : |
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2079 _cm(cm), _task(task), |
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2080 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
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2081 assert(_ref_counter_limit > 0, "sanity"); |
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2082 _ref_counter = _ref_counter_limit; |
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2083 } |
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2084 |
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2085 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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2086 virtual void do_oop( oop* p) { do_oop_work(p); } |
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2087 |
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2088 template <class T> void do_oop_work(T* p) { |
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2089 if (!_cm->has_overflown()) { |
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2090 oop obj = oopDesc::load_decode_heap_oop(p); |
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2091 if (_cm->verbose_high()) { |
2174
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2092 gclog_or_tty->print_cr("\t[%d] we're looking at location " |
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2093 "*"PTR_FORMAT" = "PTR_FORMAT, |
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2094 _task->task_id(), p, (void*) obj); |
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2095 } |
2174
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2096 |
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2097 _task->deal_with_reference(obj); |
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2098 _ref_counter--; |
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2099 |
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2100 if (_ref_counter == 0) { |
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2101 // We have dealt with _ref_counter_limit references, pushing them and objects |
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2102 // reachable from them on to the local stack (and possibly the global stack). |
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2103 // Call do_marking_step() to process these entries. We call the routine in a |
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2104 // loop, which we'll exit if there's nothing more to do (i.e. we're done |
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2105 // with the entries that we've pushed as a result of the deal_with_reference |
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2106 // calls above) or we overflow. |
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2107 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2108 // while there may still be some work to do. (See the comment at the |
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2109 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2110 // is reaching the specified time target.) It is only when |
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2111 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2112 // that the marking has completed. |
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2113 do { |
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2114 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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2115 _task->do_marking_step(mark_step_duration_ms, |
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2116 false /* do_stealing */, |
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2117 false /* do_termination */); |
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2118 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2119 _ref_counter = _ref_counter_limit; |
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2120 } |
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2121 } else { |
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2122 if (_cm->verbose_high()) { |
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2123 gclog_or_tty->print_cr("\t[%d] CM Overflow", _task->task_id()); |
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2124 } |
2174
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2125 } |
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2126 } |
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2127 }; |
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2128 |
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2129 class G1CMParDrainMarkingStackClosure: public VoidClosure { |
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2130 ConcurrentMark* _cm; |
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2131 CMTask* _task; |
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2132 public: |
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2133 G1CMParDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task) : |
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2134 _cm(cm), _task(task) { } |
2174
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2135 |
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2136 void do_void() { |
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2137 do { |
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2138 if (_cm->verbose_high()) { |
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2139 gclog_or_tty->print_cr("\t[%d] Drain: Calling do marking_step", |
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2140 _task->task_id()); |
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2141 } |
2174
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2142 |
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2143 // We call CMTask::do_marking_step() to completely drain the local and |
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2144 // global marking stacks. The routine is called in a loop, which we'll |
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|
2145 // exit if there's nothing more to do (i.e. we'completely drained the |
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2146 // entries that were pushed as a result of applying the |
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2147 // G1CMParKeepAliveAndDrainClosure to the entries on the discovered ref |
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2148 // lists above) or we overflow the global marking stack. |
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2149 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() flag |
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2150 // while there may still be some work to do. (See the comment at the |
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2151 // beginning of CMTask::do_marking_step() for those conditions - one of which |
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2152 // is reaching the specified time target.) It is only when |
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2153 // CMTask::do_marking_step() returns without setting the has_aborted() flag |
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2154 // that the marking has completed. |
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2155 |
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2156 _task->do_marking_step(1000000000.0 /* something very large */, |
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2157 true /* do_stealing */, |
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2158 true /* do_termination */); |
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2159 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2160 } |
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2161 }; |
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2162 |
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2163 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2164 // reference processing at the end of G1 concurrent marking |
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2165 |
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2166 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
2174
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2167 private: |
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2168 G1CollectedHeap* _g1h; |
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2169 ConcurrentMark* _cm; |
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2170 WorkGang* _workers; |
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2171 int _active_workers; |
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2172 |
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2173 public: |
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2174 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
2174
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2175 ConcurrentMark* cm, |
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2176 WorkGang* workers, |
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2177 int n_workers) : |
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2178 _g1h(g1h), _cm(cm), |
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2179 _workers(workers), _active_workers(n_workers) { } |
2174
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2180 |
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2181 // Executes the given task using concurrent marking worker threads. |
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2182 virtual void execute(ProcessTask& task); |
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2183 virtual void execute(EnqueueTask& task); |
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2184 }; |
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2185 |
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2186 class G1CMRefProcTaskProxy: public AbstractGangTask { |
2174
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2187 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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2188 ProcessTask& _proc_task; |
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2189 G1CollectedHeap* _g1h; |
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2190 ConcurrentMark* _cm; |
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2191 |
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2192 public: |
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2193 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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2194 G1CollectedHeap* g1h, |
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2195 ConcurrentMark* cm) : |
2174
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2196 AbstractGangTask("Process reference objects in parallel"), |
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2197 _proc_task(proc_task), _g1h(g1h), _cm(cm) { } |
2174
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2198 |
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2199 virtual void work(uint worker_id) { |
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2200 CMTask* marking_task = _cm->task(worker_id); |
2174
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2201 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2202 G1CMParKeepAliveAndDrainClosure g1_par_keep_alive(_cm, marking_task); |
2174
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2203 G1CMParDrainMarkingStackClosure g1_par_drain(_cm, marking_task); |
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2204 |
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2205 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
2174
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2206 } |
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2207 }; |
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2208 |
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2209 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
2174
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2210 assert(_workers != NULL, "Need parallel worker threads."); |
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2211 |
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2212 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
2174
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2213 |
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2214 // We need to reset the phase for each task execution so that |
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2215 // the termination protocol of CMTask::do_marking_step works. |
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2216 _cm->set_phase(_active_workers, false /* concurrent */); |
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|
2217 _g1h->set_par_threads(_active_workers); |
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2218 _workers->run_task(&proc_task_proxy); |
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|
2219 _g1h->set_par_threads(0); |
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|
2220 } |
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|
2221 |
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2222 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
2174
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|
2223 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
2224 EnqueueTask& _enq_task; |
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|
2225 |
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|
2226 public: |
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|
2227 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
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|
2228 AbstractGangTask("Enqueue reference objects in parallel"), |
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|
2229 _enq_task(enq_task) { } |
2174
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|
2230 |
4728
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2231 virtual void work(uint worker_id) { |
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|
2232 _enq_task.work(worker_id); |
2174
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|
2233 } |
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|
2234 }; |
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|
2235 |
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|
2236 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
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|
2237 assert(_workers != NULL, "Need parallel worker threads."); |
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|
2238 |
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|
2239 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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|
2240 |
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|
2241 _g1h->set_par_threads(_active_workers); |
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|
2242 _workers->run_task(&enq_task_proxy); |
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|
2243 _g1h->set_par_threads(0); |
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|
2244 } |
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|
2245 |
342 | 2246 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
2247 ResourceMark rm; | |
2248 HandleMark hm; | |
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|
2249 |
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|
2250 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
2251 |
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|
2252 // Is alive closure. |
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|
2253 G1CMIsAliveClosure g1_is_alive(g1h); |
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|
2254 |
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|
2255 // Inner scope to exclude the cleaning of the string and symbol |
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|
2256 // tables from the displayed time. |
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|
2257 { |
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|
2258 if (G1Log::finer()) { |
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|
2259 gclog_or_tty->put(' '); |
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|
2260 } |
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|
2261 TraceTime t("GC ref-proc", G1Log::finer(), false, gclog_or_tty); |
3975
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|
2262 |
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|
2263 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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|
2264 |
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|
2265 // See the comment in G1CollectedHeap::ref_processing_init() |
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|
2266 // about how reference processing currently works in G1. |
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|
2267 |
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|
2268 // Process weak references. |
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|
2269 rp->setup_policy(clear_all_soft_refs); |
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|
2270 assert(_markStack.isEmpty(), "mark stack should be empty"); |
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|
2271 |
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|
2272 G1CMKeepAliveClosure g1_keep_alive(g1h, this); |
3975
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|
2273 G1CMDrainMarkingStackClosure |
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|
2274 g1_drain_mark_stack(this, &_markStack, &g1_keep_alive); |
3975
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|
2275 |
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|
2276 // We use the work gang from the G1CollectedHeap and we utilize all |
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|
2277 // the worker threads. |
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|
2278 uint active_workers = g1h->workers() ? g1h->workers()->active_workers() : 1U; |
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2279 active_workers = MAX2(MIN2(active_workers, _max_task_num), 1U); |
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2280 |
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2281 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
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2282 g1h->workers(), active_workers); |
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2283 |
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2284 if (rp->processing_is_mt()) { |
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2285 // Set the degree of MT here. If the discovery is done MT, there |
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2286 // may have been a different number of threads doing the discovery |
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2287 // and a different number of discovered lists may have Ref objects. |
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2288 // That is OK as long as the Reference lists are balanced (see |
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2289 // balance_all_queues() and balance_queues()). |
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2290 rp->set_active_mt_degree(active_workers); |
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2291 |
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2292 rp->process_discovered_references(&g1_is_alive, |
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2293 &g1_keep_alive, |
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2294 &g1_drain_mark_stack, |
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2295 &par_task_executor); |
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2296 |
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2297 // The work routines of the parallel keep_alive and drain_marking_stack |
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2298 // will set the has_overflown flag if we overflow the global marking |
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2299 // stack. |
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2300 } else { |
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2301 rp->process_discovered_references(&g1_is_alive, |
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2302 &g1_keep_alive, |
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2303 &g1_drain_mark_stack, |
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2304 NULL); |
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2305 } |
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2306 |
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2307 assert(_markStack.overflow() || _markStack.isEmpty(), |
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2308 "mark stack should be empty (unless it overflowed)"); |
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2309 if (_markStack.overflow()) { |
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2310 // Should have been done already when we tried to push an |
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2311 // entry on to the global mark stack. But let's do it again. |
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2312 set_has_overflown(); |
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2313 } |
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2314 |
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2315 if (rp->processing_is_mt()) { |
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2316 assert(rp->num_q() == active_workers, "why not"); |
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2317 rp->enqueue_discovered_references(&par_task_executor); |
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2318 } else { |
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2319 rp->enqueue_discovered_references(); |
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2320 } |
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2321 |
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2322 rp->verify_no_references_recorded(); |
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2323 assert(!rp->discovery_enabled(), "Post condition"); |
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2324 } |
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2325 |
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2326 // Now clean up stale oops in StringTable |
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2327 StringTable::unlink(&g1_is_alive); |
2177
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2328 // Clean up unreferenced symbols in symbol table. |
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2329 SymbolTable::unlink(); |
342 | 2330 } |
2331 | |
2332 void ConcurrentMark::swapMarkBitMaps() { | |
2333 CMBitMapRO* temp = _prevMarkBitMap; | |
2334 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2335 _nextMarkBitMap = (CMBitMap*) temp; | |
2336 } | |
2337 | |
2338 class CMRemarkTask: public AbstractGangTask { | |
2339 private: | |
2340 ConcurrentMark *_cm; | |
2341 | |
2342 public: | |
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2343 void work(uint worker_id) { |
342 | 2344 // Since all available tasks are actually started, we should |
2345 // only proceed if we're supposed to be actived. | |
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2346 if (worker_id < _cm->active_tasks()) { |
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2347 CMTask* task = _cm->task(worker_id); |
342 | 2348 task->record_start_time(); |
2349 do { | |
2174
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2350 task->do_marking_step(1000000000.0 /* something very large */, |
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2351 true /* do_stealing */, |
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2352 true /* do_termination */); |
342 | 2353 } while (task->has_aborted() && !_cm->has_overflown()); |
2354 // If we overflow, then we do not want to restart. We instead | |
2355 // want to abort remark and do concurrent marking again. | |
2356 task->record_end_time(); | |
2357 } | |
2358 } | |
2359 | |
4711 | 2360 CMRemarkTask(ConcurrentMark* cm, int active_workers) : |
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2361 AbstractGangTask("Par Remark"), _cm(cm) { |
4711 | 2362 _cm->terminator()->reset_for_reuse(active_workers); |
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2363 } |
342 | 2364 }; |
2365 | |
2366 void ConcurrentMark::checkpointRootsFinalWork() { | |
2367 ResourceMark rm; | |
2368 HandleMark hm; | |
2369 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2370 | |
2371 g1h->ensure_parsability(false); | |
2372 | |
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2373 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2374 G1CollectedHeap::StrongRootsScope srs(g1h); |
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2375 // this is remark, so we'll use up all active threads |
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2376 uint active_workers = g1h->workers()->active_workers(); |
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2377 if (active_workers == 0) { |
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2378 assert(active_workers > 0, "Should have been set earlier"); |
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2379 active_workers = (uint) ParallelGCThreads; |
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2380 g1h->workers()->set_active_workers(active_workers); |
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2381 } |
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2382 set_phase(active_workers, false /* concurrent */); |
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2383 // Leave _parallel_marking_threads at it's |
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2384 // value originally calculated in the ConcurrentMark |
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2385 // constructor and pass values of the active workers |
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2386 // through the gang in the task. |
342 | 2387 |
4711 | 2388 CMRemarkTask remarkTask(this, active_workers); |
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2389 g1h->set_par_threads(active_workers); |
342 | 2390 g1h->workers()->run_task(&remarkTask); |
2391 g1h->set_par_threads(0); | |
2392 } else { | |
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2393 G1CollectedHeap::StrongRootsScope srs(g1h); |
342 | 2394 // this is remark, so we'll use up all available threads |
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2395 uint active_workers = 1; |
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2396 set_phase(active_workers, false /* concurrent */); |
342 | 2397 |
4711 | 2398 CMRemarkTask remarkTask(this, active_workers); |
342 | 2399 // We will start all available threads, even if we decide that the |
2400 // active_workers will be fewer. The extra ones will just bail out | |
2401 // immediately. | |
2402 remarkTask.work(0); | |
2403 } | |
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2404 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
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2405 guarantee(satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 2406 |
2407 print_stats(); | |
2408 | |
2409 #if VERIFY_OBJS_PROCESSED | |
2410 if (_scan_obj_cl.objs_processed != ThreadLocalObjQueue::objs_enqueued) { | |
2411 gclog_or_tty->print_cr("Processed = %d, enqueued = %d.", | |
2412 _scan_obj_cl.objs_processed, | |
2413 ThreadLocalObjQueue::objs_enqueued); | |
2414 guarantee(_scan_obj_cl.objs_processed == | |
2415 ThreadLocalObjQueue::objs_enqueued, | |
2416 "Different number of objs processed and enqueued."); | |
2417 } | |
2418 #endif | |
2419 } | |
2420 | |
1044 | 2421 #ifndef PRODUCT |
2422 | |
1388 | 2423 class PrintReachableOopClosure: public OopClosure { |
342 | 2424 private: |
2425 G1CollectedHeap* _g1h; | |
2426 outputStream* _out; | |
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2427 VerifyOption _vo; |
1388 | 2428 bool _all; |
342 | 2429 |
2430 public: | |
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2431 PrintReachableOopClosure(outputStream* out, |
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2432 VerifyOption vo, |
1388 | 2433 bool all) : |
1044 | 2434 _g1h(G1CollectedHeap::heap()), |
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2435 _out(out), _vo(vo), _all(all) { } |
342 | 2436 |
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2437 void do_oop(narrowOop* p) { do_oop_work(p); } |
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2438 void do_oop( oop* p) { do_oop_work(p); } |
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|
2439 |
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|
2440 template <class T> void do_oop_work(T* p) { |
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2441 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2442 const char* str = NULL; |
2443 const char* str2 = ""; | |
2444 | |
1388 | 2445 if (obj == NULL) { |
2446 str = ""; | |
2447 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2448 str = " O"; | |
2449 } else { | |
342 | 2450 HeapRegion* hr = _g1h->heap_region_containing(obj); |
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2451 guarantee(hr != NULL, "invariant"); |
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2452 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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2453 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2454 |
2455 if (over_tams) { | |
1388 | 2456 str = " >"; |
2457 if (marked) { | |
342 | 2458 str2 = " AND MARKED"; |
1044 | 2459 } |
1388 | 2460 } else if (marked) { |
2461 str = " M"; | |
1044 | 2462 } else { |
1388 | 2463 str = " NOT"; |
1044 | 2464 } |
342 | 2465 } |
2466 | |
1388 | 2467 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
342 | 2468 p, (void*) obj, str, str2); |
2469 } | |
2470 }; | |
2471 | |
1388 | 2472 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2473 private: |
3772
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2474 G1CollectedHeap* _g1h; |
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|
2475 outputStream* _out; |
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2476 VerifyOption _vo; |
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|
2477 bool _all; |
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|
2478 HeapRegion* _hr; |
342 | 2479 |
2480 public: | |
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2481 PrintReachableObjectClosure(outputStream* out, |
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|
2482 VerifyOption vo, |
1388 | 2483 bool all, |
2484 HeapRegion* hr) : | |
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2485 _g1h(G1CollectedHeap::heap()), |
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2486 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2487 |
2488 void do_object(oop o) { | |
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2489 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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2490 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2491 bool print_it = _all || over_tams || marked; |
2492 | |
2493 if (print_it) { | |
2494 _out->print_cr(" "PTR_FORMAT"%s", | |
2495 o, (over_tams) ? " >" : (marked) ? " M" : ""); | |
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2496 PrintReachableOopClosure oopCl(_out, _vo, _all); |
1388 | 2497 o->oop_iterate(&oopCl); |
2498 } | |
342 | 2499 } |
2500 }; | |
2501 | |
1388 | 2502 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2503 private: |
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2504 G1CollectedHeap* _g1h; |
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2505 outputStream* _out; |
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2506 VerifyOption _vo; |
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2507 bool _all; |
342 | 2508 |
2509 public: | |
2510 bool doHeapRegion(HeapRegion* hr) { | |
2511 HeapWord* b = hr->bottom(); | |
2512 HeapWord* e = hr->end(); | |
2513 HeapWord* t = hr->top(); | |
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2514 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2515 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
1044 | 2516 "TAMS: "PTR_FORMAT, b, e, t, p); |
1388 | 2517 _out->cr(); |
2518 | |
2519 HeapWord* from = b; | |
2520 HeapWord* to = t; | |
2521 | |
2522 if (to > from) { | |
2523 _out->print_cr("Objects in ["PTR_FORMAT", "PTR_FORMAT"]", from, to); | |
2524 _out->cr(); | |
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2525 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2526 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2527 _out->cr(); | |
2528 } | |
342 | 2529 |
2530 return false; | |
2531 } | |
2532 | |
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2533 PrintReachableRegionClosure(outputStream* out, |
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2534 VerifyOption vo, |
1388 | 2535 bool all) : |
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2536 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2537 }; |
2538 | |
1388 | 2539 void ConcurrentMark::print_reachable(const char* str, |
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2540 VerifyOption vo, |
1388 | 2541 bool all) { |
2542 gclog_or_tty->cr(); | |
2543 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2544 |
2545 if (G1PrintReachableBaseFile == NULL) { | |
2546 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2547 return; | |
2548 } | |
2549 | |
2550 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2551 (JVM_MAXPATHLEN - 1)) { | |
2552 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2553 return; | |
2554 } | |
2555 | |
2556 char file_name[JVM_MAXPATHLEN]; | |
2557 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2558 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2559 | |
2560 fileStream fout(file_name); | |
2561 if (!fout.is_open()) { | |
2562 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2563 return; | |
2564 } | |
2565 | |
2566 outputStream* out = &fout; | |
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2567 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2568 out->cr(); |
2569 | |
1388 | 2570 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2571 out->cr(); |
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2572 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2573 _g1h->heap_region_iterate(&rcl); |
1044 | 2574 out->cr(); |
2575 | |
2576 gclog_or_tty->print_cr(" done"); | |
1388 | 2577 gclog_or_tty->flush(); |
342 | 2578 } |
2579 | |
1044 | 2580 #endif // PRODUCT |
2581 | |
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2582 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2583 // Note we are overriding the read-only view of the prev map here, via |
2584 // the cast. | |
2585 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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2586 } |
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2587 |
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2588 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2589 _nextMarkBitMap->clearRange(mr); |
2590 } | |
2591 | |
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2592 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
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2593 clearRangePrevBitmap(mr); |
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2594 clearRangeNextBitmap(mr); |
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2595 } |
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2596 |
342 | 2597 HeapRegion* |
2598 ConcurrentMark::claim_region(int task_num) { | |
2599 // "checkpoint" the finger | |
2600 HeapWord* finger = _finger; | |
2601 | |
2602 // _heap_end will not change underneath our feet; it only changes at | |
2603 // yield points. | |
2604 while (finger < _heap_end) { | |
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2605 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2606 |
3771 | 2607 // Note on how this code handles humongous regions. In the |
2608 // normal case the finger will reach the start of a "starts | |
2609 // humongous" (SH) region. Its end will either be the end of the | |
2610 // last "continues humongous" (CH) region in the sequence, or the | |
2611 // standard end of the SH region (if the SH is the only region in | |
2612 // the sequence). That way claim_region() will skip over the CH | |
2613 // regions. However, there is a subtle race between a CM thread | |
2614 // executing this method and a mutator thread doing a humongous | |
2615 // object allocation. The two are not mutually exclusive as the CM | |
2616 // thread does not need to hold the Heap_lock when it gets | |
2617 // here. So there is a chance that claim_region() will come across | |
2618 // a free region that's in the progress of becoming a SH or a CH | |
2619 // region. In the former case, it will either | |
2620 // a) Miss the update to the region's end, in which case it will | |
2621 // visit every subsequent CH region, will find their bitmaps | |
2622 // empty, and do nothing, or | |
2623 // b) Will observe the update of the region's end (in which case | |
2624 // it will skip the subsequent CH regions). | |
2625 // If it comes across a region that suddenly becomes CH, the | |
2626 // scenario will be similar to b). So, the race between | |
2627 // claim_region() and a humongous object allocation might force us | |
2628 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2629 // iterations) but it should not introduce and correctness issues. | |
2630 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); | |
342 | 2631 HeapWord* bottom = curr_region->bottom(); |
2632 HeapWord* end = curr_region->end(); | |
2633 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2634 | |
3771 | 2635 if (verbose_low()) { |
342 | 2636 gclog_or_tty->print_cr("[%d] curr_region = "PTR_FORMAT" " |
2637 "["PTR_FORMAT", "PTR_FORMAT"), " | |
2638 "limit = "PTR_FORMAT, | |
2639 task_num, curr_region, bottom, end, limit); | |
3771 | 2640 } |
2641 | |
2642 // Is the gap between reading the finger and doing the CAS too long? | |
2643 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
342 | 2644 if (res == finger) { |
2645 // we succeeded | |
2646 | |
2647 // notice that _finger == end cannot be guaranteed here since, | |
2648 // someone else might have moved the finger even further | |
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2649 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2650 |
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2651 if (verbose_low()) { |
342 | 2652 gclog_or_tty->print_cr("[%d] we were successful with region = " |
2653 PTR_FORMAT, task_num, curr_region); | |
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2654 } |
342 | 2655 |
2656 if (limit > bottom) { | |
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2657 if (verbose_low()) { |
342 | 2658 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is not empty, " |
2659 "returning it ", task_num, curr_region); | |
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2660 } |
342 | 2661 return curr_region; |
2662 } else { | |
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2663 assert(limit == bottom, |
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2664 "the region limit should be at bottom"); |
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2665 if (verbose_low()) { |
342 | 2666 gclog_or_tty->print_cr("[%d] region "PTR_FORMAT" is empty, " |
2667 "returning NULL", task_num, curr_region); | |
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2668 } |
342 | 2669 // we return NULL and the caller should try calling |
2670 // claim_region() again. | |
2671 return NULL; | |
2672 } | |
2673 } else { | |
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2674 assert(_finger > finger, "the finger should have moved forward"); |
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2675 if (verbose_low()) { |
342 | 2676 gclog_or_tty->print_cr("[%d] somebody else moved the finger, " |
2677 "global finger = "PTR_FORMAT", " | |
2678 "our finger = "PTR_FORMAT, | |
2679 task_num, _finger, finger); | |
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2680 } |
342 | 2681 |
2682 // read it again | |
2683 finger = _finger; | |
2684 } | |
2685 } | |
2686 | |
2687 return NULL; | |
2688 } | |
2689 | |
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2690 #ifndef PRODUCT |
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2691 enum VerifyNoCSetOopsPhase { |
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2692 VerifyNoCSetOopsStack, |
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2693 VerifyNoCSetOopsQueues, |
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2694 VerifyNoCSetOopsSATBCompleted, |
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2695 VerifyNoCSetOopsSATBThread |
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2696 }; |
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2697 |
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2698 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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2699 private: |
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2700 G1CollectedHeap* _g1h; |
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2701 VerifyNoCSetOopsPhase _phase; |
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2702 int _info; |
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2703 |
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2704 const char* phase_str() { |
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2705 switch (_phase) { |
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2706 case VerifyNoCSetOopsStack: return "Stack"; |
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2707 case VerifyNoCSetOopsQueues: return "Queue"; |
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2708 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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2709 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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2710 default: ShouldNotReachHere(); |
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2711 } |
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2712 return NULL; |
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2713 } |
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2714 |
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2715 void do_object_work(oop obj) { |
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2716 guarantee(!_g1h->obj_in_cs(obj), |
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2717 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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2718 (void*) obj, phase_str(), _info)); |
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2719 } |
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2720 |
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2721 public: |
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2722 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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2723 |
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2724 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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2725 _phase = phase; |
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2726 _info = info; |
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2727 } |
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2728 |
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2729 virtual void do_oop(oop* p) { |
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2730 oop obj = oopDesc::load_decode_heap_oop(p); |
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2731 do_object_work(obj); |
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2732 } |
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2733 |
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2734 virtual void do_oop(narrowOop* p) { |
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2735 // We should not come across narrow oops while scanning marking |
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2736 // stacks and SATB buffers. |
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2737 ShouldNotReachHere(); |
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2738 } |
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2739 |
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2740 virtual void do_object(oop obj) { |
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2741 do_object_work(obj); |
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|
2742 } |
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|
2743 }; |
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|
2744 |
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|
2745 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
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2746 bool verify_enqueued_buffers, |
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|
2747 bool verify_thread_buffers, |
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|
2748 bool verify_fingers) { |
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|
2749 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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|
2750 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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2751 return; |
342 | 2752 } |
1835
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|
2753 |
4787
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|
2754 VerifyNoCSetOopsClosure cl; |
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|
2755 |
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|
2756 if (verify_stacks) { |
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|
2757 // Verify entries on the global mark stack |
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|
2758 cl.set_phase(VerifyNoCSetOopsStack); |
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2759 _markStack.oops_do(&cl); |
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|
2760 |
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|
2761 // Verify entries on the task queues |
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|
2762 for (int i = 0; i < (int) _max_task_num; i += 1) { |
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|
2763 cl.set_phase(VerifyNoCSetOopsQueues, i); |
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2764 OopTaskQueue* queue = _task_queues->queue(i); |
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|
2765 queue->oops_do(&cl); |
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|
2766 } |
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|
2767 } |
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|
2768 |
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|
2769 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
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|
2770 |
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|
2771 // Verify entries on the enqueued SATB buffers |
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|
2772 if (verify_enqueued_buffers) { |
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|
2773 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
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|
2774 satb_qs.iterate_completed_buffers_read_only(&cl); |
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|
2775 } |
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|
2776 |
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|
2777 // Verify entries on the per-thread SATB buffers |
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|
2778 if (verify_thread_buffers) { |
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|
2779 cl.set_phase(VerifyNoCSetOopsSATBThread); |
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|
2780 satb_qs.iterate_thread_buffers_read_only(&cl); |
1835
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|
2781 } |
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|
2782 |
4787
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|
2783 if (verify_fingers) { |
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|
2784 // Verify the global finger |
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|
2785 HeapWord* global_finger = finger(); |
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|
2786 if (global_finger != NULL && global_finger < _heap_end) { |
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|
2787 // The global finger always points to a heap region boundary. We |
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|
2788 // use heap_region_containing_raw() to get the containing region |
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|
2789 // given that the global finger could be pointing to a free region |
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|
2790 // which subsequently becomes continues humongous. If that |
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|
2791 // happens, heap_region_containing() will return the bottom of the |
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|
2792 // corresponding starts humongous region and the check below will |
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|
2793 // not hold any more. |
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|
2794 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
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|
2795 guarantee(global_finger == global_hr->bottom(), |
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|
2796 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
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|
2797 global_finger, HR_FORMAT_PARAMS(global_hr))); |
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|
2798 } |
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|
2799 |
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|
2800 // Verify the task fingers |
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|
2801 assert(parallel_marking_threads() <= _max_task_num, "sanity"); |
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|
2802 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
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|
2803 CMTask* task = _tasks[i]; |
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|
2804 HeapWord* task_finger = task->finger(); |
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|
2805 if (task_finger != NULL && task_finger < _heap_end) { |
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|
2806 // See above note on the global finger verification. |
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|
2807 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
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|
2808 guarantee(task_finger == task_hr->bottom() || |
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|
2809 !task_hr->in_collection_set(), |
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diff
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|
2810 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
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parents:
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diff
changeset
|
2811 task_finger, HR_FORMAT_PARAMS(task_hr))); |
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parents:
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diff
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|
2812 } |
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parents:
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diff
changeset
|
2813 } |
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parents:
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diff
changeset
|
2814 } |
342 | 2815 } |
4787
2ace1c4ee8da
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|
2816 #endif // PRODUCT |
342 | 2817 |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2818 void ConcurrentMark::clear_marking_state(bool clear_overflow) { |
342 | 2819 _markStack.setEmpty(); |
2820 _markStack.clear_overflow(); | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2821 if (clear_overflow) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2822 clear_has_overflown(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2823 } else { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
2824 assert(has_overflown(), "pre-condition"); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
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|
2825 } |
342 | 2826 _finger = _heap_start; |
2827 | |
2828 for (int i = 0; i < (int)_max_task_num; ++i) { | |
2829 OopTaskQueue* queue = _task_queues->queue(i); | |
2830 queue->set_empty(); | |
2831 } | |
2832 } | |
2833 | |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
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|
2834 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
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parents:
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diff
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|
2835 // with marking. |
d30fa85f9994
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diff
changeset
|
2836 class AggregateCountDataHRClosure: public HeapRegionClosure { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
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|
2837 ConcurrentMark* _cm; |
d30fa85f9994
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diff
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|
2838 BitMap* _cm_card_bm; |
d30fa85f9994
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diff
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|
2839 size_t _max_task_num; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
2840 |
d30fa85f9994
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diff
changeset
|
2841 public: |
d30fa85f9994
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diff
changeset
|
2842 AggregateCountDataHRClosure(ConcurrentMark *cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
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|
2843 BitMap* cm_card_bm, |
d30fa85f9994
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diff
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|
2844 size_t max_task_num) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
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diff
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|
2845 _cm(cm), _cm_card_bm(cm_card_bm), |
d30fa85f9994
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diff
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|
2846 _max_task_num(max_task_num) { } |
d30fa85f9994
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diff
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|
2847 |
d30fa85f9994
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diff
changeset
|
2848 bool is_card_aligned(HeapWord* p) { |
d30fa85f9994
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diff
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|
2849 return ((uintptr_t(p) & (CardTableModRefBS::card_size - 1)) == 0); |
d30fa85f9994
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parents:
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diff
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|
2850 } |
d30fa85f9994
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diff
changeset
|
2851 |
d30fa85f9994
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parents:
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diff
changeset
|
2852 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
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|
2853 if (hr->continuesHumongous()) { |
d30fa85f9994
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parents:
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diff
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|
2854 // We will ignore these here and process them when their |
d30fa85f9994
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diff
changeset
|
2855 // associated "starts humongous" region is processed. |
d30fa85f9994
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parents:
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diff
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|
2856 // Note that we cannot rely on their associated |
d30fa85f9994
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parents:
4830
diff
changeset
|
2857 // "starts humongous" region to have their bit set to 1 |
d30fa85f9994
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diff
changeset
|
2858 // since, due to the region chunking in the parallel region |
d30fa85f9994
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diff
changeset
|
2859 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
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diff
changeset
|
2860 // before its associated "starts humongous". |
d30fa85f9994
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parents:
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diff
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|
2861 return false; |
d30fa85f9994
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parents:
4830
diff
changeset
|
2862 } |
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diff
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|
2863 |
d30fa85f9994
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diff
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|
2864 HeapWord* start = hr->bottom(); |
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diff
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|
2865 HeapWord* limit = hr->next_top_at_mark_start(); |
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diff
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|
2866 HeapWord* end = hr->end(); |
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diff
changeset
|
2867 |
d30fa85f9994
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diff
changeset
|
2868 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
d30fa85f9994
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4830
diff
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|
2869 err_msg("Preconditions not met - " |
d30fa85f9994
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4830
diff
changeset
|
2870 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
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4830
diff
changeset
|
2871 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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4830
diff
changeset
|
2872 start, limit, hr->top(), hr->end())); |
d30fa85f9994
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4830
diff
changeset
|
2873 |
d30fa85f9994
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parents:
4830
diff
changeset
|
2874 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
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4830
diff
changeset
|
2875 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2876 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2877 // NTAMS of this region has not been set so nothing to do. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2878 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2879 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2880 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2881 assert(is_card_aligned(start), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2882 assert(is_card_aligned(end), "sanity"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2883 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2884 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2885 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2886 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2887 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2888 // If ntams is not card aligned then we bump the index for |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2889 // limit so that we get the card spanning ntams. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2890 if (!is_card_aligned(limit)) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2891 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2892 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2893 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2894 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2895 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2896 // Aggregate the "stripe" in the count data associated with hr. |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2897 uint hrs_index = hr->hrs_index(); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2898 size_t marked_bytes = 0; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2899 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2900 for (int i = 0; (size_t)i < _max_task_num; i += 1) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2901 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2902 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2903 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2904 // Fetch the marked_bytes in this region for task i and |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2905 // add it to the running total for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2906 marked_bytes += marked_bytes_array[hrs_index]; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2907 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2908 // Now union the bitmaps[0,max_task_num)[start_idx..limit_idx) |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2909 // into the global card bitmap. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2910 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2911 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2912 while (scan_idx < limit_idx) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2913 assert(task_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2914 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2915 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2916 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2917 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2918 // its left_offset parameter is greater than its right_offset |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2919 // parameter. If does, however, have an early exit if |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2920 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2921 // passed in for left offset here. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2922 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2923 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2924 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2925 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2926 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2927 // Update the marked bytes for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2928 hr->add_to_marked_bytes(marked_bytes); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2929 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2930 // Next heap region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2931 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2932 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2933 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2934 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2935 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2936 protected: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2937 G1CollectedHeap* _g1h; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2938 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2939 BitMap* _cm_card_bm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2940 size_t _max_task_num; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2941 int _active_workers; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2942 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2943 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2944 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2945 ConcurrentMark* cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2946 BitMap* cm_card_bm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2947 size_t max_task_num, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2948 int n_workers) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2949 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2950 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2951 _max_task_num(max_task_num), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2952 _active_workers(n_workers) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2953 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2954 void work(uint worker_id) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2955 AggregateCountDataHRClosure cl(_cm, _cm_card_bm, _max_task_num); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2956 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2957 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2958 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2959 _active_workers, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2960 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2961 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2962 _g1h->heap_region_iterate(&cl); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2963 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2964 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2965 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2966 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2967 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2968 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2969 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2970 _g1h->workers()->active_workers() : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2971 1); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2972 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2973 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2974 _max_task_num, n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2975 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2976 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2977 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2978 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2979 _g1h->set_par_threads(n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2980 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2981 _g1h->set_par_threads(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2982 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2983 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2984 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2985 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2986 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2987 g1_par_agg_task.work(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2988 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2989 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2990 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2991 // Clear the per-worker arrays used to store the per-region counting data |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2992 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2993 // Clear the global card bitmap - it will be filled during |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2994 // liveness count aggregation (during remark) and the |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2995 // final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2996 _card_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2997 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2998 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2999 // of the final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3000 _region_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
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3001 |
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3002 uint max_regions = _g1h->max_regions(); |
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3003 assert(_max_task_num != 0, "unitialized"); |
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3004 |
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3005 for (int i = 0; (size_t) i < _max_task_num; i += 1) { |
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3006 BitMap* task_card_bm = count_card_bitmap_for(i); |
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3007 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
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3008 |
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3009 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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3010 assert(marked_bytes_array != NULL, "uninitialized"); |
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3011 |
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3012 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
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3013 task_card_bm->clear(); |
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3014 } |
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3015 } |
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3016 |
342 | 3017 void ConcurrentMark::print_stats() { |
3018 if (verbose_stats()) { | |
3019 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3020 for (size_t i = 0; i < _active_tasks; ++i) { | |
3021 _tasks[i]->print_stats(); | |
3022 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3023 } | |
3024 } | |
3025 } | |
3026 | |
3027 // abandon current marking iteration due to a Full GC | |
3028 void ConcurrentMark::abort() { | |
3029 // Clear all marks to force marking thread to do nothing | |
3030 _nextMarkBitMap->clearAll(); | |
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3031 // Clear the liveness counting data |
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3032 clear_all_count_data(); |
342 | 3033 // Empty mark stack |
3034 clear_marking_state(); | |
1835
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3035 for (int i = 0; i < (int)_max_task_num; ++i) { |
342 | 3036 _tasks[i]->clear_region_fields(); |
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3037 } |
342 | 3038 _has_aborted = true; |
3039 | |
3040 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3041 satb_mq_set.abandon_partial_marking(); | |
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3042 // This can be called either during or outside marking, we'll read |
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3043 // the expected_active value from the SATB queue set. |
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3044 satb_mq_set.set_active_all_threads( |
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3045 false, /* new active value */ |
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3046 satb_mq_set.is_active() /* expected_active */); |
342 | 3047 } |
3048 | |
3049 static void print_ms_time_info(const char* prefix, const char* name, | |
3050 NumberSeq& ns) { | |
3051 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3052 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3053 if (ns.num() > 0) { | |
3054 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3055 prefix, ns.sd(), ns.maximum()); | |
3056 } | |
3057 } | |
3058 | |
3059 void ConcurrentMark::print_summary_info() { | |
3060 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3061 print_ms_time_info(" ", "init marks", _init_times); | |
3062 print_ms_time_info(" ", "remarks", _remark_times); | |
3063 { | |
3064 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3065 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3066 | |
3067 } | |
3068 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3069 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3070 _total_counting_time, | |
3071 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3072 (double)_cleanup_times.num() | |
3073 : 0.0)); | |
3074 if (G1ScrubRemSets) { | |
3075 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3076 _total_rs_scrub_time, | |
3077 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3078 (double)_cleanup_times.num() | |
3079 : 0.0)); | |
3080 } | |
3081 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3082 (_init_times.sum() + _remark_times.sum() + | |
3083 _cleanup_times.sum())/1000.0); | |
3084 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
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3085 "(%8.2f s marking).", |
342 | 3086 cmThread()->vtime_accum(), |
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3087 cmThread()->vtime_mark_accum()); |
342 | 3088 } |
3089 | |
1019 | 3090 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
3091 _parallel_workers->print_worker_threads_on(st); | |
3092 } | |
3093 | |
342 | 3094 // We take a break if someone is trying to stop the world. |
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3095 bool ConcurrentMark::do_yield_check(uint worker_id) { |
342 | 3096 if (should_yield()) { |
4728
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3097 if (worker_id == 0) { |
342 | 3098 _g1h->g1_policy()->record_concurrent_pause(); |
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3099 } |
342 | 3100 cmThread()->yield(); |
3101 return true; | |
3102 } else { | |
3103 return false; | |
3104 } | |
3105 } | |
3106 | |
3107 bool ConcurrentMark::should_yield() { | |
3108 return cmThread()->should_yield(); | |
3109 } | |
3110 | |
3111 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
3112 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
3113 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
3114 } | |
3115 | |
3116 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
3117 void* last) { | |
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3118 return containing_card_is_marked(start) && |
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3119 containing_card_is_marked(last); |
342 | 3120 } |
3121 | |
3122 #ifndef PRODUCT | |
3123 // for debugging purposes | |
3124 void ConcurrentMark::print_finger() { | |
3125 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
3126 _heap_start, _heap_end, _finger); | |
3127 for (int i = 0; i < (int) _max_task_num; ++i) { | |
3128 gclog_or_tty->print(" %d: "PTR_FORMAT, i, _tasks[i]->finger()); | |
3129 } | |
3130 gclog_or_tty->print_cr(""); | |
3131 } | |
3132 #endif | |
3133 | |
3771 | 3134 void CMTask::scan_object(oop obj) { |
3135 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3136 | |
3137 if (_cm->verbose_high()) { | |
3138 gclog_or_tty->print_cr("[%d] we're scanning object "PTR_FORMAT, | |
3139 _task_id, (void*) obj); | |
3140 } | |
3141 | |
3142 size_t obj_size = obj->size(); | |
3143 _words_scanned += obj_size; | |
3144 | |
3145 obj->oop_iterate(_cm_oop_closure); | |
3146 statsOnly( ++_objs_scanned ); | |
3147 check_limits(); | |
3148 } | |
3149 | |
342 | 3150 // Closure for iteration over bitmaps |
3151 class CMBitMapClosure : public BitMapClosure { | |
3152 private: | |
3153 // the bitmap that is being iterated over | |
3154 CMBitMap* _nextMarkBitMap; | |
3155 ConcurrentMark* _cm; | |
3156 CMTask* _task; | |
3157 | |
3158 public: | |
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3159 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3160 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3161 |
3162 bool do_bit(size_t offset) { | |
3163 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3164 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3165 assert( addr < _cm->finger(), "invariant"); |
342 | 3166 |
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3167 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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3168 assert(addr >= _task->finger(), "invariant"); |
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3169 |
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3170 // We move that task's local finger along. |
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3171 _task->move_finger_to(addr); |
342 | 3172 |
3173 _task->scan_object(oop(addr)); | |
3174 // we only partially drain the local queue and global stack | |
3175 _task->drain_local_queue(true); | |
3176 _task->drain_global_stack(true); | |
3177 | |
3178 // if the has_aborted flag has been raised, we need to bail out of | |
3179 // the iteration | |
3180 return !_task->has_aborted(); | |
3181 } | |
3182 }; | |
3183 | |
3184 // Closure for iterating over objects, currently only used for | |
3185 // processing SATB buffers. | |
3186 class CMObjectClosure : public ObjectClosure { | |
3187 private: | |
3188 CMTask* _task; | |
3189 | |
3190 public: | |
3191 void do_object(oop obj) { | |
3192 _task->deal_with_reference(obj); | |
3193 } | |
3194 | |
3195 CMObjectClosure(CMTask* task) : _task(task) { } | |
3196 }; | |
3197 | |
3771 | 3198 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3199 ConcurrentMark* cm, | |
3200 CMTask* task) | |
3201 : _g1h(g1h), _cm(cm), _task(task) { | |
3202 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3203 | |
3204 if (G1UseConcMarkReferenceProcessing) { | |
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3205 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3206 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3207 } |
3771 | 3208 } |
342 | 3209 |
3210 void CMTask::setup_for_region(HeapRegion* hr) { | |
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3211 // Separated the asserts so that we know which one fires. |
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3212 assert(hr != NULL, |
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3213 "claim_region() should have filtered out continues humongous regions"); |
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3214 assert(!hr->continuesHumongous(), |
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3215 "claim_region() should have filtered out continues humongous regions"); |
342 | 3216 |
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3217 if (_cm->verbose_low()) { |
342 | 3218 gclog_or_tty->print_cr("[%d] setting up for region "PTR_FORMAT, |
3219 _task_id, hr); | |
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3220 } |
342 | 3221 |
3222 _curr_region = hr; | |
3223 _finger = hr->bottom(); | |
3224 update_region_limit(); | |
3225 } | |
3226 | |
3227 void CMTask::update_region_limit() { | |
3228 HeapRegion* hr = _curr_region; | |
3229 HeapWord* bottom = hr->bottom(); | |
3230 HeapWord* limit = hr->next_top_at_mark_start(); | |
3231 | |
3232 if (limit == bottom) { | |
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3233 if (_cm->verbose_low()) { |
342 | 3234 gclog_or_tty->print_cr("[%d] found an empty region " |
3235 "["PTR_FORMAT", "PTR_FORMAT")", | |
3236 _task_id, bottom, limit); | |
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3237 } |
342 | 3238 // The region was collected underneath our feet. |
3239 // We set the finger to bottom to ensure that the bitmap | |
3240 // iteration that will follow this will not do anything. | |
3241 // (this is not a condition that holds when we set the region up, | |
3242 // as the region is not supposed to be empty in the first place) | |
3243 _finger = bottom; | |
3244 } else if (limit >= _region_limit) { | |
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3245 assert(limit >= _finger, "peace of mind"); |
342 | 3246 } else { |
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3247 assert(limit < _region_limit, "only way to get here"); |
342 | 3248 // This can happen under some pretty unusual circumstances. An |
3249 // evacuation pause empties the region underneath our feet (NTAMS | |
3250 // at bottom). We then do some allocation in the region (NTAMS | |
3251 // stays at bottom), followed by the region being used as a GC | |
3252 // alloc region (NTAMS will move to top() and the objects | |
3253 // originally below it will be grayed). All objects now marked in | |
3254 // the region are explicitly grayed, if below the global finger, | |
3255 // and we do not need in fact to scan anything else. So, we simply | |
3256 // set _finger to be limit to ensure that the bitmap iteration | |
3257 // doesn't do anything. | |
3258 _finger = limit; | |
3259 } | |
3260 | |
3261 _region_limit = limit; | |
3262 } | |
3263 | |
3264 void CMTask::giveup_current_region() { | |
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3265 assert(_curr_region != NULL, "invariant"); |
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3266 if (_cm->verbose_low()) { |
342 | 3267 gclog_or_tty->print_cr("[%d] giving up region "PTR_FORMAT, |
3268 _task_id, _curr_region); | |
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3269 } |
342 | 3270 clear_region_fields(); |
3271 } | |
3272 | |
3273 void CMTask::clear_region_fields() { | |
3274 // Values for these three fields that indicate that we're not | |
3275 // holding on to a region. | |
3276 _curr_region = NULL; | |
3277 _finger = NULL; | |
3278 _region_limit = NULL; | |
3279 } | |
3280 | |
3771 | 3281 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3282 if (cm_oop_closure == NULL) { | |
3283 assert(_cm_oop_closure != NULL, "invariant"); | |
3284 } else { | |
3285 assert(_cm_oop_closure == NULL, "invariant"); | |
3286 } | |
3287 _cm_oop_closure = cm_oop_closure; | |
3288 } | |
3289 | |
342 | 3290 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3291 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3292 |
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3293 if (_cm->verbose_low()) { |
342 | 3294 gclog_or_tty->print_cr("[%d] resetting", _task_id); |
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3295 } |
342 | 3296 |
3297 _nextMarkBitMap = nextMarkBitMap; | |
3298 clear_region_fields(); | |
3299 | |
3300 _calls = 0; | |
3301 _elapsed_time_ms = 0.0; | |
3302 _termination_time_ms = 0.0; | |
3303 _termination_start_time_ms = 0.0; | |
3304 | |
3305 #if _MARKING_STATS_ | |
3306 _local_pushes = 0; | |
3307 _local_pops = 0; | |
3308 _local_max_size = 0; | |
3309 _objs_scanned = 0; | |
3310 _global_pushes = 0; | |
3311 _global_pops = 0; | |
3312 _global_max_size = 0; | |
3313 _global_transfers_to = 0; | |
3314 _global_transfers_from = 0; | |
3315 _regions_claimed = 0; | |
3316 _objs_found_on_bitmap = 0; | |
3317 _satb_buffers_processed = 0; | |
3318 _steal_attempts = 0; | |
3319 _steals = 0; | |
3320 _aborted = 0; | |
3321 _aborted_overflow = 0; | |
3322 _aborted_cm_aborted = 0; | |
3323 _aborted_yield = 0; | |
3324 _aborted_timed_out = 0; | |
3325 _aborted_satb = 0; | |
3326 _aborted_termination = 0; | |
3327 #endif // _MARKING_STATS_ | |
3328 } | |
3329 | |
3330 bool CMTask::should_exit_termination() { | |
3331 regular_clock_call(); | |
3332 // This is called when we are in the termination protocol. We should | |
3333 // quit if, for some reason, this task wants to abort or the global | |
3334 // stack is not empty (this means that we can get work from it). | |
3335 return !_cm->mark_stack_empty() || has_aborted(); | |
3336 } | |
3337 | |
3338 void CMTask::reached_limit() { | |
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3339 assert(_words_scanned >= _words_scanned_limit || |
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3340 _refs_reached >= _refs_reached_limit , |
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3341 "shouldn't have been called otherwise"); |
342 | 3342 regular_clock_call(); |
3343 } | |
3344 | |
3345 void CMTask::regular_clock_call() { | |
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3346 if (has_aborted()) return; |
342 | 3347 |
3348 // First, we need to recalculate the words scanned and refs reached | |
3349 // limits for the next clock call. | |
3350 recalculate_limits(); | |
3351 | |
3352 // During the regular clock call we do the following | |
3353 | |
3354 // (1) If an overflow has been flagged, then we abort. | |
3355 if (_cm->has_overflown()) { | |
3356 set_has_aborted(); | |
3357 return; | |
3358 } | |
3359 | |
3360 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3361 // to check anything else. The other steps are only needed during | |
3362 // the concurrent marking phase. | |
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3363 if (!concurrent()) return; |
342 | 3364 |
3365 // (2) If marking has been aborted for Full GC, then we also abort. | |
3366 if (_cm->has_aborted()) { | |
3367 set_has_aborted(); | |
3368 statsOnly( ++_aborted_cm_aborted ); | |
3369 return; | |
3370 } | |
3371 | |
3372 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3373 | |
3374 // (3) If marking stats are enabled, then we update the step history. | |
3375 #if _MARKING_STATS_ | |
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3376 if (_words_scanned >= _words_scanned_limit) { |
342 | 3377 ++_clock_due_to_scanning; |
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3378 } |
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3379 if (_refs_reached >= _refs_reached_limit) { |
342 | 3380 ++_clock_due_to_marking; |
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3381 } |
342 | 3382 |
3383 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3384 _interval_start_time_ms = curr_time_ms; | |
3385 _all_clock_intervals_ms.add(last_interval_ms); | |
3386 | |
3387 if (_cm->verbose_medium()) { | |
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3388 gclog_or_tty->print_cr("[%d] regular clock, interval = %1.2lfms, " |
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3389 "scanned = %d%s, refs reached = %d%s", |
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3390 _task_id, last_interval_ms, |
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3391 _words_scanned, |
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3392 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3393 _refs_reached, |
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3394 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3395 } |
3396 #endif // _MARKING_STATS_ | |
3397 | |
3398 // (4) We check whether we should yield. If we have to, then we abort. | |
3399 if (_cm->should_yield()) { | |
3400 // We should yield. To do this we abort the task. The caller is | |
3401 // responsible for yielding. | |
3402 set_has_aborted(); | |
3403 statsOnly( ++_aborted_yield ); | |
3404 return; | |
3405 } | |
3406 | |
3407 // (5) We check whether we've reached our time quota. If we have, | |
3408 // then we abort. | |
3409 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3410 if (elapsed_time_ms > _time_target_ms) { | |
3411 set_has_aborted(); | |
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3412 _has_timed_out = true; |
342 | 3413 statsOnly( ++_aborted_timed_out ); |
3414 return; | |
3415 } | |
3416 | |
3417 // (6) Finally, we check whether there are enough completed STAB | |
3418 // buffers available for processing. If there are, we abort. | |
3419 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3420 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
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3421 if (_cm->verbose_low()) { |
342 | 3422 gclog_or_tty->print_cr("[%d] aborting to deal with pending SATB buffers", |
3423 _task_id); | |
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3424 } |
342 | 3425 // we do need to process SATB buffers, we'll abort and restart |
3426 // the marking task to do so | |
3427 set_has_aborted(); | |
3428 statsOnly( ++_aborted_satb ); | |
3429 return; | |
3430 } | |
3431 } | |
3432 | |
3433 void CMTask::recalculate_limits() { | |
3434 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3435 _words_scanned_limit = _real_words_scanned_limit; | |
3436 | |
3437 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3438 _refs_reached_limit = _real_refs_reached_limit; | |
3439 } | |
3440 | |
3441 void CMTask::decrease_limits() { | |
3442 // This is called when we believe that we're going to do an infrequent | |
3443 // operation which will increase the per byte scanned cost (i.e. move | |
3444 // entries to/from the global stack). It basically tries to decrease the | |
3445 // scanning limit so that the clock is called earlier. | |
3446 | |
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3447 if (_cm->verbose_medium()) { |
342 | 3448 gclog_or_tty->print_cr("[%d] decreasing limits", _task_id); |
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3449 } |
342 | 3450 |
3451 _words_scanned_limit = _real_words_scanned_limit - | |
3452 3 * words_scanned_period / 4; | |
3453 _refs_reached_limit = _real_refs_reached_limit - | |
3454 3 * refs_reached_period / 4; | |
3455 } | |
3456 | |
3457 void CMTask::move_entries_to_global_stack() { | |
3458 // local array where we'll store the entries that will be popped | |
3459 // from the local queue | |
3460 oop buffer[global_stack_transfer_size]; | |
3461 | |
3462 int n = 0; | |
3463 oop obj; | |
3464 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3465 buffer[n] = obj; | |
3466 ++n; | |
3467 } | |
3468 | |
3469 if (n > 0) { | |
3470 // we popped at least one entry from the local queue | |
3471 | |
3472 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3473 | |
3474 if (!_cm->mark_stack_push(buffer, n)) { | |
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3475 if (_cm->verbose_low()) { |
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3476 gclog_or_tty->print_cr("[%d] aborting due to global stack overflow", |
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3477 _task_id); |
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3478 } |
342 | 3479 set_has_aborted(); |
3480 } else { | |
3481 // the transfer was successful | |
3482 | |
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3483 if (_cm->verbose_medium()) { |
342 | 3484 gclog_or_tty->print_cr("[%d] pushed %d entries to the global stack", |
3485 _task_id, n); | |
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3486 } |
342 | 3487 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3488 if (tmp_size > _global_max_size) { |
342 | 3489 _global_max_size = tmp_size; |
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3490 } |
342 | 3491 _global_pushes += n ); |
3492 } | |
3493 } | |
3494 | |
3495 // this operation was quite expensive, so decrease the limits | |
3496 decrease_limits(); | |
3497 } | |
3498 | |
3499 void CMTask::get_entries_from_global_stack() { | |
3500 // local array where we'll store the entries that will be popped | |
3501 // from the global stack. | |
3502 oop buffer[global_stack_transfer_size]; | |
3503 int n; | |
3504 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3505 assert(n <= global_stack_transfer_size, |
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3506 "we should not pop more than the given limit"); |
342 | 3507 if (n > 0) { |
3508 // yes, we did actually pop at least one entry | |
3509 | |
3510 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3511 if (_cm->verbose_medium()) { |
342 | 3512 gclog_or_tty->print_cr("[%d] popped %d entries from the global stack", |
3513 _task_id, n); | |
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3514 } |
342 | 3515 for (int i = 0; i < n; ++i) { |
3516 bool success = _task_queue->push(buffer[i]); | |
3517 // We only call this when the local queue is empty or under a | |
3518 // given target limit. So, we do not expect this push to fail. | |
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3519 assert(success, "invariant"); |
342 | 3520 } |
3521 | |
3522 statsOnly( int tmp_size = _task_queue->size(); | |
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3523 if (tmp_size > _local_max_size) { |
342 | 3524 _local_max_size = tmp_size; |
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3525 } |
342 | 3526 _local_pushes += n ); |
3527 } | |
3528 | |
3529 // this operation was quite expensive, so decrease the limits | |
3530 decrease_limits(); | |
3531 } | |
3532 | |
3533 void CMTask::drain_local_queue(bool partially) { | |
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3534 if (has_aborted()) return; |
342 | 3535 |
3536 // Decide what the target size is, depending whether we're going to | |
3537 // drain it partially (so that other tasks can steal if they run out | |
3538 // of things to do) or totally (at the very end). | |
3539 size_t target_size; | |
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3540 if (partially) { |
342 | 3541 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3542 } else { |
342 | 3543 target_size = 0; |
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3544 } |
342 | 3545 |
3546 if (_task_queue->size() > target_size) { | |
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3547 if (_cm->verbose_high()) { |
342 | 3548 gclog_or_tty->print_cr("[%d] draining local queue, target size = %d", |
3549 _task_id, target_size); | |
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3550 } |
342 | 3551 |
3552 oop obj; | |
3553 bool ret = _task_queue->pop_local(obj); | |
3554 while (ret) { | |
3555 statsOnly( ++_local_pops ); | |
3556 | |
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3557 if (_cm->verbose_high()) { |
342 | 3558 gclog_or_tty->print_cr("[%d] popped "PTR_FORMAT, _task_id, |
3559 (void*) obj); | |
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3560 } |
342 | 3561 |
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3562 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3563 assert(!_g1h->is_on_master_free_list( |
2152 | 3564 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3565 |
3566 scan_object(obj); | |
3567 | |
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3568 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3569 ret = false; |
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3570 } else { |
342 | 3571 ret = _task_queue->pop_local(obj); |
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3572 } |
342 | 3573 } |
3574 | |
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3575 if (_cm->verbose_high()) { |
342 | 3576 gclog_or_tty->print_cr("[%d] drained local queue, size = %d", |
3577 _task_id, _task_queue->size()); | |
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3578 } |
342 | 3579 } |
3580 } | |
3581 | |
3582 void CMTask::drain_global_stack(bool partially) { | |
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3583 if (has_aborted()) return; |
342 | 3584 |
3585 // We have a policy to drain the local queue before we attempt to | |
3586 // drain the global stack. | |
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3587 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3588 |
3589 // Decide what the target size is, depending whether we're going to | |
3590 // drain it partially (so that other tasks can steal if they run out | |
3591 // of things to do) or totally (at the very end). Notice that, | |
3592 // because we move entries from the global stack in chunks or | |
3593 // because another task might be doing the same, we might in fact | |
3594 // drop below the target. But, this is not a problem. | |
3595 size_t target_size; | |
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3596 if (partially) { |
342 | 3597 target_size = _cm->partial_mark_stack_size_target(); |
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3598 } else { |
342 | 3599 target_size = 0; |
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3600 } |
342 | 3601 |
3602 if (_cm->mark_stack_size() > target_size) { | |
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3603 if (_cm->verbose_low()) { |
342 | 3604 gclog_or_tty->print_cr("[%d] draining global_stack, target size %d", |
3605 _task_id, target_size); | |
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3606 } |
342 | 3607 |
3608 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3609 get_entries_from_global_stack(); | |
3610 drain_local_queue(partially); | |
3611 } | |
3612 | |
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3613 if (_cm->verbose_low()) { |
342 | 3614 gclog_or_tty->print_cr("[%d] drained global stack, size = %d", |
3615 _task_id, _cm->mark_stack_size()); | |
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3616 } |
342 | 3617 } |
3618 } | |
3619 | |
3620 // SATB Queue has several assumptions on whether to call the par or | |
3621 // non-par versions of the methods. this is why some of the code is | |
3622 // replicated. We should really get rid of the single-threaded version | |
3623 // of the code to simplify things. | |
3624 void CMTask::drain_satb_buffers() { | |
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3625 if (has_aborted()) return; |
342 | 3626 |
3627 // We set this so that the regular clock knows that we're in the | |
3628 // middle of draining buffers and doesn't set the abort flag when it | |
3629 // notices that SATB buffers are available for draining. It'd be | |
3630 // very counter productive if it did that. :-) | |
3631 _draining_satb_buffers = true; | |
3632 | |
3633 CMObjectClosure oc(this); | |
3634 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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3635 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3636 satb_mq_set.set_par_closure(_task_id, &oc); |
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3637 } else { |
342 | 3638 satb_mq_set.set_closure(&oc); |
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3639 } |
342 | 3640 |
3641 // This keeps claiming and applying the closure to completed buffers | |
3642 // until we run out of buffers or we need to abort. | |
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3643 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3644 while (!has_aborted() && |
3645 satb_mq_set.par_apply_closure_to_completed_buffer(_task_id)) { | |
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3646 if (_cm->verbose_medium()) { |
342 | 3647 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
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3648 } |
342 | 3649 statsOnly( ++_satb_buffers_processed ); |
3650 regular_clock_call(); | |
3651 } | |
3652 } else { | |
3653 while (!has_aborted() && | |
3654 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3655 if (_cm->verbose_medium()) { |
342 | 3656 gclog_or_tty->print_cr("[%d] processed an SATB buffer", _task_id); |
3776
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3657 } |
342 | 3658 statsOnly( ++_satb_buffers_processed ); |
3659 regular_clock_call(); | |
3660 } | |
3661 } | |
3662 | |
3663 if (!concurrent() && !has_aborted()) { | |
3664 // We should only do this during remark. | |
3776
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3665 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3666 satb_mq_set.par_iterate_closure_all_threads(_task_id); |
3776
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3667 } else { |
342 | 3668 satb_mq_set.iterate_closure_all_threads(); |
3776
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3669 } |
342 | 3670 } |
3671 | |
3672 _draining_satb_buffers = false; | |
3673 | |
1023
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3674 assert(has_aborted() || |
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3675 concurrent() || |
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3676 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 3677 |
3776
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3678 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3679 satb_mq_set.set_par_closure(_task_id, NULL); |
3776
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3680 } else { |
342 | 3681 satb_mq_set.set_closure(NULL); |
3776
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3682 } |
342 | 3683 |
3684 // again, this was a potentially expensive operation, decrease the | |
3685 // limits to get the regular clock call early | |
3686 decrease_limits(); | |
3687 } | |
3688 | |
3689 void CMTask::print_stats() { | |
3690 gclog_or_tty->print_cr("Marking Stats, task = %d, calls = %d", | |
3691 _task_id, _calls); | |
3692 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", | |
3693 _elapsed_time_ms, _termination_time_ms); | |
3694 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3695 _step_times_ms.num(), _step_times_ms.avg(), | |
3696 _step_times_ms.sd()); | |
3697 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3698 _step_times_ms.maximum(), _step_times_ms.sum()); | |
3699 | |
3700 #if _MARKING_STATS_ | |
3701 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
3702 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
3703 _all_clock_intervals_ms.sd()); | |
3704 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
3705 _all_clock_intervals_ms.maximum(), | |
3706 _all_clock_intervals_ms.sum()); | |
3707 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
3708 _clock_due_to_scanning, _clock_due_to_marking); | |
3709 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
3710 _objs_scanned, _objs_found_on_bitmap); | |
3711 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
3712 _local_pushes, _local_pops, _local_max_size); | |
3713 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
3714 _global_pushes, _global_pops, _global_max_size); | |
3715 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
3716 _global_transfers_to,_global_transfers_from); | |
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3717 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 3718 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
3719 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
3720 _steal_attempts, _steals); | |
3721 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
3722 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
3723 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
3724 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
3725 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
3726 #endif // _MARKING_STATS_ | |
3727 } | |
3728 | |
3729 /***************************************************************************** | |
3730 | |
3731 The do_marking_step(time_target_ms) method is the building block | |
3732 of the parallel marking framework. It can be called in parallel | |
3733 with other invocations of do_marking_step() on different tasks | |
3734 (but only one per task, obviously) and concurrently with the | |
3735 mutator threads, or during remark, hence it eliminates the need | |
3736 for two versions of the code. When called during remark, it will | |
3737 pick up from where the task left off during the concurrent marking | |
3738 phase. Interestingly, tasks are also claimable during evacuation | |
3739 pauses too, since do_marking_step() ensures that it aborts before | |
3740 it needs to yield. | |
3741 | |
3742 The data structures that is uses to do marking work are the | |
3743 following: | |
3744 | |
3745 (1) Marking Bitmap. If there are gray objects that appear only | |
3746 on the bitmap (this happens either when dealing with an overflow | |
3747 or when the initial marking phase has simply marked the roots | |
3748 and didn't push them on the stack), then tasks claim heap | |
3749 regions whose bitmap they then scan to find gray objects. A | |
3750 global finger indicates where the end of the last claimed region | |
3751 is. A local finger indicates how far into the region a task has | |
3752 scanned. The two fingers are used to determine how to gray an | |
3753 object (i.e. whether simply marking it is OK, as it will be | |
3754 visited by a task in the future, or whether it needs to be also | |
3755 pushed on a stack). | |
3756 | |
3757 (2) Local Queue. The local queue of the task which is accessed | |
3758 reasonably efficiently by the task. Other tasks can steal from | |
3759 it when they run out of work. Throughout the marking phase, a | |
3760 task attempts to keep its local queue short but not totally | |
3761 empty, so that entries are available for stealing by other | |
3762 tasks. Only when there is no more work, a task will totally | |
3763 drain its local queue. | |
3764 | |
3765 (3) Global Mark Stack. This handles local queue overflow. During | |
3766 marking only sets of entries are moved between it and the local | |
3767 queues, as access to it requires a mutex and more fine-grain | |
3768 interaction with it which might cause contention. If it | |
3769 overflows, then the marking phase should restart and iterate | |
3770 over the bitmap to identify gray objects. Throughout the marking | |
3771 phase, tasks attempt to keep the global mark stack at a small | |
3772 length but not totally empty, so that entries are available for | |
3773 popping by other tasks. Only when there is no more work, tasks | |
3774 will totally drain the global mark stack. | |
3775 | |
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3776 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 3777 made available. Buffers are regularly removed from this queue |
3778 and scanned for roots, so that the queue doesn't get too | |
3779 long. During remark, all completed buffers are processed, as | |
3780 well as the filled in parts of any uncompleted buffers. | |
3781 | |
3782 The do_marking_step() method tries to abort when the time target | |
3783 has been reached. There are a few other cases when the | |
3784 do_marking_step() method also aborts: | |
3785 | |
3786 (1) When the marking phase has been aborted (after a Full GC). | |
3787 | |
5988
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3788 (2) When a global overflow (on the global stack) has been |
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3789 triggered. Before the task aborts, it will actually sync up with |
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3790 the other tasks to ensure that all the marking data structures |
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3791 (local queues, stacks, fingers etc.) are re-initialised so that |
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3792 when do_marking_step() completes, the marking phase can |
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3793 immediately restart. |
342 | 3794 |
3795 (3) When enough completed SATB buffers are available. The | |
3796 do_marking_step() method only tries to drain SATB buffers right | |
3797 at the beginning. So, if enough buffers are available, the | |
3798 marking step aborts and the SATB buffers are processed at | |
3799 the beginning of the next invocation. | |
3800 | |
3801 (4) To yield. when we have to yield then we abort and yield | |
3802 right at the end of do_marking_step(). This saves us from a lot | |
3803 of hassle as, by yielding we might allow a Full GC. If this | |
3804 happens then objects will be compacted underneath our feet, the | |
3805 heap might shrink, etc. We save checking for this by just | |
3806 aborting and doing the yield right at the end. | |
3807 | |
3808 From the above it follows that the do_marking_step() method should | |
3809 be called in a loop (or, otherwise, regularly) until it completes. | |
3810 | |
3811 If a marking step completes without its has_aborted() flag being | |
3812 true, it means it has completed the current marking phase (and | |
3813 also all other marking tasks have done so and have all synced up). | |
3814 | |
3815 A method called regular_clock_call() is invoked "regularly" (in | |
3816 sub ms intervals) throughout marking. It is this clock method that | |
3817 checks all the abort conditions which were mentioned above and | |
3818 decides when the task should abort. A work-based scheme is used to | |
3819 trigger this clock method: when the number of object words the | |
3820 marking phase has scanned or the number of references the marking | |
3821 phase has visited reach a given limit. Additional invocations to | |
3822 the method clock have been planted in a few other strategic places | |
3823 too. The initial reason for the clock method was to avoid calling | |
3824 vtime too regularly, as it is quite expensive. So, once it was in | |
3825 place, it was natural to piggy-back all the other conditions on it | |
3826 too and not constantly check them throughout the code. | |
3827 | |
3828 *****************************************************************************/ | |
3829 | |
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3830 void CMTask::do_marking_step(double time_target_ms, |
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3831 bool do_stealing, |
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3832 bool do_termination) { |
1023
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3833 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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3834 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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3835 |
342 | 3836 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
1023
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3837 assert(_task_queues != NULL, "invariant"); |
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3838 assert(_task_queue != NULL, "invariant"); |
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3839 assert(_task_queues->queue(_task_id) == _task_queue, "invariant"); |
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3840 |
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3841 assert(!_claimed, |
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3842 "only one thread should claim this task at any one time"); |
342 | 3843 |
3844 // OK, this doesn't safeguard again all possible scenarios, as it is | |
3845 // possible for two threads to set the _claimed flag at the same | |
3846 // time. But it is only for debugging purposes anyway and it will | |
3847 // catch most problems. | |
3848 _claimed = true; | |
3849 | |
3850 _start_time_ms = os::elapsedVTime() * 1000.0; | |
3851 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
3852 | |
3853 double diff_prediction_ms = | |
3854 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
3855 _time_target_ms = time_target_ms - diff_prediction_ms; | |
3856 | |
3857 // set up the variables that are used in the work-based scheme to | |
3858 // call the regular clock method | |
3859 _words_scanned = 0; | |
3860 _refs_reached = 0; | |
3861 recalculate_limits(); | |
3862 | |
3863 // clear all flags | |
3864 clear_has_aborted(); | |
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3865 _has_timed_out = false; |
342 | 3866 _draining_satb_buffers = false; |
3867 | |
3868 ++_calls; | |
3869 | |
3776
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3870 if (_cm->verbose_low()) { |
342 | 3871 gclog_or_tty->print_cr("[%d] >>>>>>>>>> START, call = %d, " |
3872 "target = %1.2lfms >>>>>>>>>>", | |
3873 _task_id, _calls, _time_target_ms); | |
3776
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3874 } |
342 | 3875 |
3876 // Set up the bitmap and oop closures. Anything that uses them is | |
3877 // eventually called from this method, so it is OK to allocate these | |
3878 // statically. | |
3879 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 3880 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
3881 set_cm_oop_closure(&cm_oop_closure); | |
342 | 3882 |
3883 if (_cm->has_overflown()) { | |
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3884 // This can happen if the mark stack overflows during a GC pause |
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3885 // and this task, after a yield point, restarts. We have to abort |
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3886 // as we need to get into the overflow protocol which happens |
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3887 // right at the end of this task. |
342 | 3888 set_has_aborted(); |
3889 } | |
3890 | |
3891 // First drain any available SATB buffers. After this, we will not | |
3892 // look at SATB buffers before the next invocation of this method. | |
3893 // If enough completed SATB buffers are queued up, the regular clock | |
3894 // will abort this task so that it restarts. | |
3895 drain_satb_buffers(); | |
3896 // ...then partially drain the local queue and the global stack | |
3897 drain_local_queue(true); | |
3898 drain_global_stack(true); | |
3899 | |
3900 do { | |
3901 if (!has_aborted() && _curr_region != NULL) { | |
3902 // This means that we're already holding on to a region. | |
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3903 assert(_finger != NULL, "if region is not NULL, then the finger " |
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3904 "should not be NULL either"); |
342 | 3905 |
3906 // We might have restarted this task after an evacuation pause | |
3907 // which might have evacuated the region we're holding on to | |
3908 // underneath our feet. Let's read its limit again to make sure | |
3909 // that we do not iterate over a region of the heap that | |
3910 // contains garbage (update_region_limit() will also move | |
3911 // _finger to the start of the region if it is found empty). | |
3912 update_region_limit(); | |
3913 // We will start from _finger not from the start of the region, | |
3914 // as we might be restarting this task after aborting half-way | |
3915 // through scanning this region. In this case, _finger points to | |
3916 // the address where we last found a marked object. If this is a | |
3917 // fresh region, _finger points to start(). | |
3918 MemRegion mr = MemRegion(_finger, _region_limit); | |
3919 | |
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3920 if (_cm->verbose_low()) { |
342 | 3921 gclog_or_tty->print_cr("[%d] we're scanning part " |
3922 "["PTR_FORMAT", "PTR_FORMAT") " | |
3923 "of region "PTR_FORMAT, | |
3924 _task_id, _finger, _region_limit, _curr_region); | |
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3925 } |
342 | 3926 |
3927 // Let's iterate over the bitmap of the part of the | |
3928 // region that is left. | |
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3929 if (mr.is_empty() || _nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 3930 // We successfully completed iterating over the region. Now, |
3931 // let's give up the region. | |
3932 giveup_current_region(); | |
3933 regular_clock_call(); | |
3934 } else { | |
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3935 assert(has_aborted(), "currently the only way to do so"); |
342 | 3936 // The only way to abort the bitmap iteration is to return |
3937 // false from the do_bit() method. However, inside the | |
3938 // do_bit() method we move the _finger to point to the | |
3939 // object currently being looked at. So, if we bail out, we | |
3940 // have definitely set _finger to something non-null. | |
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3941 assert(_finger != NULL, "invariant"); |
342 | 3942 |
3943 // Region iteration was actually aborted. So now _finger | |
3944 // points to the address of the object we last scanned. If we | |
3945 // leave it there, when we restart this task, we will rescan | |
3946 // the object. It is easy to avoid this. We move the finger by | |
3947 // enough to point to the next possible object header (the | |
3948 // bitmap knows by how much we need to move it as it knows its | |
3949 // granularity). | |
1314
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3950 assert(_finger < _region_limit, "invariant"); |
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3951 HeapWord* new_finger = _nextMarkBitMap->nextWord(_finger); |
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3952 // Check if bitmap iteration was aborted while scanning the last object |
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3953 if (new_finger >= _region_limit) { |
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3954 giveup_current_region(); |
1314
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3955 } else { |
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3956 move_finger_to(new_finger); |
1314
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3957 } |
342 | 3958 } |
3959 } | |
3960 // At this point we have either completed iterating over the | |
3961 // region we were holding on to, or we have aborted. | |
3962 | |
3963 // We then partially drain the local queue and the global stack. | |
3964 // (Do we really need this?) | |
3965 drain_local_queue(true); | |
3966 drain_global_stack(true); | |
3967 | |
3968 // Read the note on the claim_region() method on why it might | |
3969 // return NULL with potentially more regions available for | |
3970 // claiming and why we have to check out_of_regions() to determine | |
3971 // whether we're done or not. | |
3972 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
3973 // We are going to try to claim a new region. We should have | |
3974 // given up on the previous one. | |
1023
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3975 // Separated the asserts so that we know which one fires. |
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3976 assert(_curr_region == NULL, "invariant"); |
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3977 assert(_finger == NULL, "invariant"); |
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3978 assert(_region_limit == NULL, "invariant"); |
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3979 if (_cm->verbose_low()) { |
342 | 3980 gclog_or_tty->print_cr("[%d] trying to claim a new region", _task_id); |
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3981 } |
342 | 3982 HeapRegion* claimed_region = _cm->claim_region(_task_id); |
3983 if (claimed_region != NULL) { | |
3984 // Yes, we managed to claim one | |
3985 statsOnly( ++_regions_claimed ); | |
3986 | |
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3987 if (_cm->verbose_low()) { |
342 | 3988 gclog_or_tty->print_cr("[%d] we successfully claimed " |
3989 "region "PTR_FORMAT, | |
3990 _task_id, claimed_region); | |
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3991 } |
342 | 3992 |
3993 setup_for_region(claimed_region); | |
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3994 assert(_curr_region == claimed_region, "invariant"); |
342 | 3995 } |
3996 // It is important to call the regular clock here. It might take | |
3997 // a while to claim a region if, for example, we hit a large | |
3998 // block of empty regions. So we need to call the regular clock | |
3999 // method once round the loop to make sure it's called | |
4000 // frequently enough. | |
4001 regular_clock_call(); | |
4002 } | |
4003 | |
4004 if (!has_aborted() && _curr_region == NULL) { | |
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4005 assert(_cm->out_of_regions(), |
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4006 "at this point we should be out of regions"); |
342 | 4007 } |
4008 } while ( _curr_region != NULL && !has_aborted()); | |
4009 | |
4010 if (!has_aborted()) { | |
4011 // We cannot check whether the global stack is empty, since other | |
5988
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4012 // tasks might be pushing objects to it concurrently. |
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4013 assert(_cm->out_of_regions(), |
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4014 "at this point we should be out of regions"); |
342 | 4015 |
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4016 if (_cm->verbose_low()) { |
342 | 4017 gclog_or_tty->print_cr("[%d] all regions claimed", _task_id); |
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4018 } |
342 | 4019 |
4020 // Try to reduce the number of available SATB buffers so that | |
4021 // remark has less work to do. | |
4022 drain_satb_buffers(); | |
4023 } | |
4024 | |
4025 // Since we've done everything else, we can now totally drain the | |
4026 // local queue and global stack. | |
4027 drain_local_queue(false); | |
4028 drain_global_stack(false); | |
4029 | |
4030 // Attempt at work stealing from other task's queues. | |
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4031 if (do_stealing && !has_aborted()) { |
342 | 4032 // We have not aborted. This means that we have finished all that |
4033 // we could. Let's try to do some stealing... | |
4034 | |
4035 // We cannot check whether the global stack is empty, since other | |
5988
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4036 // tasks might be pushing objects to it concurrently. |
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4037 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
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4038 "only way to reach here"); |
342 | 4039 |
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4040 if (_cm->verbose_low()) { |
342 | 4041 gclog_or_tty->print_cr("[%d] starting to steal", _task_id); |
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4042 } |
342 | 4043 |
4044 while (!has_aborted()) { | |
4045 oop obj; | |
4046 statsOnly( ++_steal_attempts ); | |
4047 | |
4048 if (_cm->try_stealing(_task_id, &_hash_seed, obj)) { | |
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4049 if (_cm->verbose_medium()) { |
342 | 4050 gclog_or_tty->print_cr("[%d] stolen "PTR_FORMAT" successfully", |
4051 _task_id, (void*) obj); | |
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4052 } |
342 | 4053 |
4054 statsOnly( ++_steals ); | |
4055 | |
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4056 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
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4057 "any stolen object should be marked"); |
342 | 4058 scan_object(obj); |
4059 | |
4060 // And since we're towards the end, let's totally drain the | |
4061 // local queue and global stack. | |
4062 drain_local_queue(false); | |
4063 drain_global_stack(false); | |
4064 } else { | |
4065 break; | |
4066 } | |
4067 } | |
4068 } | |
4069 | |
3316
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4070 // If we are about to wrap up and go into termination, check if we |
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4071 // should raise the overflow flag. |
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4072 if (do_termination && !has_aborted()) { |
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4073 if (_cm->force_overflow()->should_force()) { |
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4074 _cm->set_has_overflown(); |
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4075 regular_clock_call(); |
cd8e33b2a8ad
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4076 } |
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4077 } |
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4078 |
342 | 4079 // We still haven't aborted. Now, let's try to get into the |
4080 // termination protocol. | |
2174
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4081 if (do_termination && !has_aborted()) { |
342 | 4082 // We cannot check whether the global stack is empty, since other |
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4083 // tasks might be concurrently pushing objects on it. |
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4084 // Separated the asserts so that we know which one fires. |
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4085 assert(_cm->out_of_regions(), "only way to reach here"); |
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4086 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4087 |
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4088 if (_cm->verbose_low()) { |
342 | 4089 gclog_or_tty->print_cr("[%d] starting termination protocol", _task_id); |
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4090 } |
342 | 4091 |
4092 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
4093 // The CMTask class also extends the TerminatorTerminator class, | |
4094 // hence its should_exit_termination() method will also decide | |
4095 // whether to exit the termination protocol or not. | |
4096 bool finished = _cm->terminator()->offer_termination(this); | |
4097 double termination_end_time_ms = os::elapsedVTime() * 1000.0; | |
4098 _termination_time_ms += | |
4099 termination_end_time_ms - _termination_start_time_ms; | |
4100 | |
4101 if (finished) { | |
4102 // We're all done. | |
4103 | |
4104 if (_task_id == 0) { | |
4105 // let's allow task 0 to do this | |
4106 if (concurrent()) { | |
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4107 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4108 // we need to set this to false before the next |
4109 // safepoint. This way we ensure that the marking phase | |
4110 // doesn't observe any more heap expansions. | |
4111 _cm->clear_concurrent_marking_in_progress(); | |
4112 } | |
4113 } | |
4114 | |
4115 // We can now guarantee that the global stack is empty, since | |
1023
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|
4116 // all other tasks have finished. We separated the guarantees so |
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4117 // that, if a condition is false, we can immediately find out |
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|
4118 // which one. |
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4119 guarantee(_cm->out_of_regions(), "only way to reach here"); |
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4120 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
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4121 guarantee(_task_queue->size() == 0, "only way to reach here"); |
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4122 guarantee(!_cm->has_overflown(), "only way to reach here"); |
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4123 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4124 |
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|
4125 if (_cm->verbose_low()) { |
342 | 4126 gclog_or_tty->print_cr("[%d] all tasks terminated", _task_id); |
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|
4127 } |
342 | 4128 } else { |
4129 // Apparently there's more work to do. Let's abort this task. It | |
4130 // will restart it and we can hopefully find more things to do. | |
4131 | |
3776
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|
4132 if (_cm->verbose_low()) { |
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|
4133 gclog_or_tty->print_cr("[%d] apparently there is more work to do", |
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|
4134 _task_id); |
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|
4135 } |
342 | 4136 |
4137 set_has_aborted(); | |
4138 statsOnly( ++_aborted_termination ); | |
4139 } | |
4140 } | |
4141 | |
4142 // Mainly for debugging purposes to make sure that a pointer to the | |
4143 // closure which was statically allocated in this frame doesn't | |
4144 // escape it by accident. | |
3771 | 4145 set_cm_oop_closure(NULL); |
342 | 4146 double end_time_ms = os::elapsedVTime() * 1000.0; |
4147 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4148 // Update the step history. | |
4149 _step_times_ms.add(elapsed_time_ms); | |
4150 | |
4151 if (has_aborted()) { | |
4152 // The task was aborted for some reason. | |
4153 | |
4154 statsOnly( ++_aborted ); | |
4155 | |
2174
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|
4156 if (_has_timed_out) { |
342 | 4157 double diff_ms = elapsed_time_ms - _time_target_ms; |
4158 // Keep statistics of how well we did with respect to hitting | |
4159 // our target only if we actually timed out (if we aborted for | |
4160 // other reasons, then the results might get skewed). | |
4161 _marking_step_diffs_ms.add(diff_ms); | |
4162 } | |
4163 | |
4164 if (_cm->has_overflown()) { | |
4165 // This is the interesting one. We aborted because a global | |
4166 // overflow was raised. This means we have to restart the | |
4167 // marking phase and start iterating over regions. However, in | |
4168 // order to do this we have to make sure that all tasks stop | |
4169 // what they are doing and re-initialise in a safe manner. We | |
4170 // will achieve this with the use of two barrier sync points. | |
4171 | |
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4172 if (_cm->verbose_low()) { |
342 | 4173 gclog_or_tty->print_cr("[%d] detected overflow", _task_id); |
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|
4174 } |
342 | 4175 |
4176 _cm->enter_first_sync_barrier(_task_id); | |
4177 // When we exit this sync barrier we know that all tasks have | |
4178 // stopped doing marking work. So, it's now safe to | |
4179 // re-initialise our data structures. At the end of this method, | |
4180 // task 0 will clear the global data structures. | |
4181 | |
4182 statsOnly( ++_aborted_overflow ); | |
4183 | |
4184 // We clear the local state of this task... | |
4185 clear_region_fields(); | |
4186 | |
4187 // ...and enter the second barrier. | |
4188 _cm->enter_second_sync_barrier(_task_id); | |
4189 // At this point everything has bee re-initialised and we're | |
4190 // ready to restart. | |
4191 } | |
4192 | |
4193 if (_cm->verbose_low()) { | |
4194 gclog_or_tty->print_cr("[%d] <<<<<<<<<< ABORTING, target = %1.2lfms, " | |
4195 "elapsed = %1.2lfms <<<<<<<<<<", | |
4196 _task_id, _time_target_ms, elapsed_time_ms); | |
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|
4197 if (_cm->has_aborted()) { |
342 | 4198 gclog_or_tty->print_cr("[%d] ========== MARKING ABORTED ==========", |
4199 _task_id); | |
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|
4200 } |
342 | 4201 } |
4202 } else { | |
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|
4203 if (_cm->verbose_low()) { |
342 | 4204 gclog_or_tty->print_cr("[%d] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
4205 "elapsed = %1.2lfms <<<<<<<<<<", | |
4206 _task_id, _time_target_ms, elapsed_time_ms); | |
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|
4207 } |
342 | 4208 } |
4209 | |
4210 _claimed = false; | |
4211 } | |
4212 | |
4213 CMTask::CMTask(int task_id, | |
4214 ConcurrentMark* cm, | |
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|
4215 size_t* marked_bytes, |
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|
4216 BitMap* card_bm, |
342 | 4217 CMTaskQueue* task_queue, |
4218 CMTaskQueueSet* task_queues) | |
4219 : _g1h(G1CollectedHeap::heap()), | |
4220 _task_id(task_id), _cm(cm), | |
4221 _claimed(false), | |
4222 _nextMarkBitMap(NULL), _hash_seed(17), | |
4223 _task_queue(task_queue), | |
4224 _task_queues(task_queues), | |
3771 | 4225 _cm_oop_closure(NULL), |
4836
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|
4226 _marked_bytes_array(marked_bytes), |
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|
4227 _card_bm(card_bm) { |
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|
4228 guarantee(task_queue != NULL, "invariant"); |
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|
4229 guarantee(task_queues != NULL, "invariant"); |
342 | 4230 |
4231 statsOnly( _clock_due_to_scanning = 0; | |
4232 _clock_due_to_marking = 0 ); | |
4233 | |
4234 _marking_step_diffs_ms.add(0.5); | |
4235 } | |
2435
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4236 |
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|
4237 // These are formatting macros that are used below to ensure |
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|
4238 // consistent formatting. The *_H_* versions are used to format the |
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|
4239 // header for a particular value and they should be kept consistent |
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|
4240 // with the corresponding macro. Also note that most of the macros add |
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|
4241 // the necessary white space (as a prefix) which makes them a bit |
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|
4242 // easier to compose. |
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|
4243 |
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|
4244 // All the output lines are prefixed with this string to be able to |
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|
4245 // identify them easily in a large log file. |
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|
4246 #define G1PPRL_LINE_PREFIX "###" |
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|
4247 |
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|
4248 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
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|
4249 #ifdef _LP64 |
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|
4250 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
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|
4251 #else // _LP64 |
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|
4252 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
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|
4253 #endif // _LP64 |
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|
4254 |
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|
4255 // For per-region info |
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|
4256 #define G1PPRL_TYPE_FORMAT " %-4s" |
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|
4257 #define G1PPRL_TYPE_H_FORMAT " %4s" |
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4258 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
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4259 #define G1PPRL_BYTE_H_FORMAT " %9s" |
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|
4260 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
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|
4261 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
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|
4262 |
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|
4263 // For summary info |
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|
4264 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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4265 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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4266 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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4267 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4268 |
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|
4269 G1PrintRegionLivenessInfoClosure:: |
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|
4270 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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|
4271 : _out(out), |
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|
4272 _total_used_bytes(0), _total_capacity_bytes(0), |
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|
4273 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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|
4274 _hum_used_bytes(0), _hum_capacity_bytes(0), |
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|
4275 _hum_prev_live_bytes(0), _hum_next_live_bytes(0) { |
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|
4276 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
4277 MemRegion g1_committed = g1h->g1_committed(); |
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|
4278 MemRegion g1_reserved = g1h->g1_reserved(); |
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|
4279 double now = os::elapsedTime(); |
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|
4280 |
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|
4281 // Print the header of the output. |
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|
4282 _out->cr(); |
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|
4283 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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|
4284 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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|
4285 G1PPRL_SUM_ADDR_FORMAT("committed") |
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|
4286 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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|
4287 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
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|
4288 g1_committed.start(), g1_committed.end(), |
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|
4289 g1_reserved.start(), g1_reserved.end(), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
4290 HeapRegion::GrainBytes); |
2435
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|
4291 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4292 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4293 G1PPRL_TYPE_H_FORMAT |
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|
4294 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4295 G1PPRL_BYTE_H_FORMAT |
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|
4296 G1PPRL_BYTE_H_FORMAT |
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|
4297 G1PPRL_BYTE_H_FORMAT |
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|
4298 G1PPRL_DOUBLE_H_FORMAT, |
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|
4299 "type", "address-range", |
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|
4300 "used", "prev-live", "next-live", "gc-eff"); |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
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|
4301 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4302 G1PPRL_TYPE_H_FORMAT |
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|
4303 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4304 G1PPRL_BYTE_H_FORMAT |
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|
4305 G1PPRL_BYTE_H_FORMAT |
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|
4306 G1PPRL_BYTE_H_FORMAT |
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|
4307 G1PPRL_DOUBLE_H_FORMAT, |
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|
4308 "", "", |
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|
4309 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)"); |
2435
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|
4310 } |
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|
4311 |
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|
4312 // It takes as a parameter a reference to one of the _hum_* fields, it |
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|
4313 // deduces the corresponding value for a region in a humongous region |
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|
4314 // series (either the region size, or what's left if the _hum_* field |
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|
4315 // is < the region size), and updates the _hum_* field accordingly. |
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|
4316 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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|
4317 size_t bytes = 0; |
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|
4318 // The > 0 check is to deal with the prev and next live bytes which |
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|
4319 // could be 0. |
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|
4320 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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diff
changeset
|
4321 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
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|
4322 *hum_bytes -= bytes; |
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|
4323 } |
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|
4324 return bytes; |
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changeset
|
4325 } |
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changeset
|
4326 |
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|
4327 // It deduces the values for a region in a humongous region series |
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|
4328 // from the _hum_* fields and updates those accordingly. It assumes |
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|
4329 // that that _hum_* fields have already been set up from the "starts |
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|
4330 // humongous" region and we visit the regions in address order. |
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|
4331 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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|
4332 size_t* capacity_bytes, |
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|
4333 size_t* prev_live_bytes, |
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|
4334 size_t* next_live_bytes) { |
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|
4335 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
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|
4336 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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|
4337 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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|
4338 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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|
4339 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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|
4340 } |
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|
4341 |
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|
4342 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
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|
4343 const char* type = ""; |
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|
4344 HeapWord* bottom = r->bottom(); |
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|
4345 HeapWord* end = r->end(); |
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|
4346 size_t capacity_bytes = r->capacity(); |
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|
4347 size_t used_bytes = r->used(); |
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|
4348 size_t prev_live_bytes = r->live_bytes(); |
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|
4349 size_t next_live_bytes = r->next_live_bytes(); |
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|
4350 double gc_eff = r->gc_efficiency(); |
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|
4351 if (r->used() == 0) { |
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|
4352 type = "FREE"; |
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|
4353 } else if (r->is_survivor()) { |
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|
4354 type = "SURV"; |
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|
4355 } else if (r->is_young()) { |
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4356 type = "EDEN"; |
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4357 } else if (r->startsHumongous()) { |
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4358 type = "HUMS"; |
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4359 |
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4360 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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4361 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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4362 "they should have been zeroed after the last time we used them"); |
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4363 // Set up the _hum_* fields. |
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4364 _hum_capacity_bytes = capacity_bytes; |
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4365 _hum_used_bytes = used_bytes; |
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4366 _hum_prev_live_bytes = prev_live_bytes; |
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4367 _hum_next_live_bytes = next_live_bytes; |
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4368 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4369 &prev_live_bytes, &next_live_bytes); |
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4370 end = bottom + HeapRegion::GrainWords; |
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4371 } else if (r->continuesHumongous()) { |
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4372 type = "HUMC"; |
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4373 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4374 &prev_live_bytes, &next_live_bytes); |
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4375 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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4376 } else { |
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4377 type = "OLD"; |
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4378 } |
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|
4379 |
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4380 _total_used_bytes += used_bytes; |
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4381 _total_capacity_bytes += capacity_bytes; |
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4382 _total_prev_live_bytes += prev_live_bytes; |
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4383 _total_next_live_bytes += next_live_bytes; |
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|
4384 |
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4385 // Print a line for this particular region. |
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4386 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4387 G1PPRL_TYPE_FORMAT |
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|
4388 G1PPRL_ADDR_BASE_FORMAT |
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4389 G1PPRL_BYTE_FORMAT |
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|
4390 G1PPRL_BYTE_FORMAT |
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4391 G1PPRL_BYTE_FORMAT |
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4392 G1PPRL_DOUBLE_FORMAT, |
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4393 type, bottom, end, |
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4394 used_bytes, prev_live_bytes, next_live_bytes, gc_eff); |
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|
4395 |
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|
4396 return false; |
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|
4397 } |
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|
4398 |
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|
4399 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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4400 // Print the footer of the output. |
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|
4401 _out->print_cr(G1PPRL_LINE_PREFIX); |
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4402 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4403 " SUMMARY" |
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|
4404 G1PPRL_SUM_MB_FORMAT("capacity") |
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4405 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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4406 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
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4407 G1PPRL_SUM_MB_PERC_FORMAT("next-live"), |
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|
4408 bytes_to_mb(_total_capacity_bytes), |
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|
4409 bytes_to_mb(_total_used_bytes), |
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|
4410 perc(_total_used_bytes, _total_capacity_bytes), |
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|
4411 bytes_to_mb(_total_prev_live_bytes), |
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|
4412 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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|
4413 bytes_to_mb(_total_next_live_bytes), |
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|
4414 perc(_total_next_live_bytes, _total_capacity_bytes)); |
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|
4415 _out->cr(); |
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|
4416 } |