Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 23027:2e5e058881f4
8075466: SATB queue pre-filter verify found reclaimed humongous object
Summary: Removed pre-filter verify, and made filtering more careful.
Reviewed-by: brutisso, tschatzl
author | kbarrett |
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date | Wed, 15 Apr 2015 16:37:57 -0400 |
parents | b7c8142a9e0b |
children | b5d14ef905b5 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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" |
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26 #include "classfile/metadataOnStackMark.hpp" |
1972 | 27 #include "classfile/symbolTable.hpp" |
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28 #include "code/codeCache.hpp" |
3771 | 29 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
31 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
32 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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33 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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34 #include "gc_implementation/g1/g1Log.hpp" |
3771 | 35 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 36 #include "gc_implementation/g1/g1RemSet.hpp" |
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37 #include "gc_implementation/g1/heapRegion.inline.hpp" |
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38 #include "gc_implementation/g1/heapRegionManager.inline.hpp" |
1972 | 39 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
20337 | 40 #include "gc_implementation/g1/heapRegionSet.inline.hpp" |
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41 #include "gc_implementation/shared/vmGCOperations.hpp" |
10405 | 42 #include "gc_implementation/shared/gcTimer.hpp" |
43 #include "gc_implementation/shared/gcTrace.hpp" | |
44 #include "gc_implementation/shared/gcTraceTime.hpp" | |
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45 #include "memory/allocation.hpp" |
1972 | 46 #include "memory/genOopClosures.inline.hpp" |
47 #include "memory/referencePolicy.hpp" | |
48 #include "memory/resourceArea.hpp" | |
49 #include "oops/oop.inline.hpp" | |
50 #include "runtime/handles.inline.hpp" | |
51 #include "runtime/java.hpp" | |
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52 #include "runtime/prefetch.inline.hpp" |
6197 | 53 #include "services/memTracker.hpp" |
342 | 54 |
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55 // Concurrent marking bit map wrapper |
342 | 56 |
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57 CMBitMapRO::CMBitMapRO(int shifter) : |
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58 _bm(), |
342 | 59 _shifter(shifter) { |
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60 _bmStartWord = 0; |
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61 _bmWordSize = 0; |
342 | 62 } |
63 | |
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64 HeapWord* CMBitMapRO::getNextMarkedWordAddress(const HeapWord* addr, |
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65 const HeapWord* limit) const { |
342 | 66 // First we must round addr *up* to a possible object boundary. |
67 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
68 HeapWordSize << _shifter); | |
69 size_t addrOffset = heapWordToOffset(addr); | |
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70 if (limit == NULL) { |
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71 limit = _bmStartWord + _bmWordSize; |
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72 } |
342 | 73 size_t limitOffset = heapWordToOffset(limit); |
74 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
75 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
76 assert(nextAddr >= addr, "get_next_one postcondition"); | |
77 assert(nextAddr == limit || isMarked(nextAddr), | |
78 "get_next_one postcondition"); | |
79 return nextAddr; | |
80 } | |
81 | |
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82 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(const HeapWord* addr, |
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83 const HeapWord* limit) const { |
342 | 84 size_t addrOffset = heapWordToOffset(addr); |
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85 if (limit == NULL) { |
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86 limit = _bmStartWord + _bmWordSize; |
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87 } |
342 | 88 size_t limitOffset = heapWordToOffset(limit); |
89 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
90 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
91 assert(nextAddr >= addr, "get_next_one postcondition"); | |
92 assert(nextAddr == limit || !isMarked(nextAddr), | |
93 "get_next_one postcondition"); | |
94 return nextAddr; | |
95 } | |
96 | |
97 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
98 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
99 return (int) (diff >> _shifter); | |
100 } | |
101 | |
102 #ifndef PRODUCT | |
20337 | 103 bool CMBitMapRO::covers(MemRegion heap_rs) const { |
342 | 104 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); |
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105 assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
342 | 106 "size inconsistency"); |
20337 | 107 return _bmStartWord == (HeapWord*)(heap_rs.start()) && |
108 _bmWordSize == heap_rs.word_size(); | |
342 | 109 } |
110 #endif | |
111 | |
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112 void CMBitMapRO::print_on_error(outputStream* st, const char* prefix) const { |
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113 _bm.print_on_error(st, prefix); |
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114 } |
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115 |
20337 | 116 size_t CMBitMap::compute_size(size_t heap_size) { |
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117 return ReservedSpace::allocation_align_size_up(heap_size / mark_distance()); |
20337 | 118 } |
119 | |
120 size_t CMBitMap::mark_distance() { | |
121 return MinObjAlignmentInBytes * BitsPerByte; | |
122 } | |
123 | |
124 void CMBitMap::initialize(MemRegion heap, G1RegionToSpaceMapper* storage) { | |
125 _bmStartWord = heap.start(); | |
126 _bmWordSize = heap.word_size(); | |
127 | |
128 _bm.set_map((BitMap::bm_word_t*) storage->reserved().start()); | |
129 _bm.set_size(_bmWordSize >> _shifter); | |
130 | |
131 storage->set_mapping_changed_listener(&_listener); | |
132 } | |
133 | |
20543 | 134 void CMBitMapMappingChangedListener::on_commit(uint start_region, size_t num_regions, bool zero_filled) { |
135 if (zero_filled) { | |
136 return; | |
137 } | |
20337 | 138 // We need to clear the bitmap on commit, removing any existing information. |
139 MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_region), num_regions * HeapRegion::GrainWords); | |
140 _bm->clearRange(mr); | |
141 } | |
142 | |
143 // Closure used for clearing the given mark bitmap. | |
144 class ClearBitmapHRClosure : public HeapRegionClosure { | |
145 private: | |
146 ConcurrentMark* _cm; | |
147 CMBitMap* _bitmap; | |
148 bool _may_yield; // The closure may yield during iteration. If yielded, abort the iteration. | |
149 public: | |
150 ClearBitmapHRClosure(ConcurrentMark* cm, CMBitMap* bitmap, bool may_yield) : HeapRegionClosure(), _cm(cm), _bitmap(bitmap), _may_yield(may_yield) { | |
151 assert(!may_yield || cm != NULL, "CM must be non-NULL if this closure is expected to yield."); | |
152 } | |
153 | |
154 virtual bool doHeapRegion(HeapRegion* r) { | |
155 size_t const chunk_size_in_words = M / HeapWordSize; | |
156 | |
157 HeapWord* cur = r->bottom(); | |
158 HeapWord* const end = r->end(); | |
159 | |
160 while (cur < end) { | |
161 MemRegion mr(cur, MIN2(cur + chunk_size_in_words, end)); | |
162 _bitmap->clearRange(mr); | |
163 | |
164 cur += chunk_size_in_words; | |
165 | |
166 // Abort iteration if after yielding the marking has been aborted. | |
167 if (_may_yield && _cm->do_yield_check() && _cm->has_aborted()) { | |
168 return true; | |
169 } | |
170 // Repeat the asserts from before the start of the closure. We will do them | |
171 // as asserts here to minimize their overhead on the product. However, we | |
172 // will have them as guarantees at the beginning / end of the bitmap | |
173 // clearing to get some checking in the product. | |
174 assert(!_may_yield || _cm->cmThread()->during_cycle(), "invariant"); | |
175 assert(!_may_yield || !G1CollectedHeap::heap()->mark_in_progress(), "invariant"); | |
176 } | |
177 | |
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178 return false; |
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179 } |
20337 | 180 }; |
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181 |
342 | 182 void CMBitMap::clearAll() { |
20337 | 183 ClearBitmapHRClosure cl(NULL, this, false /* may_yield */); |
184 G1CollectedHeap::heap()->heap_region_iterate(&cl); | |
185 guarantee(cl.complete(), "Must have completed iteration."); | |
342 | 186 return; |
187 } | |
188 | |
189 void CMBitMap::markRange(MemRegion mr) { | |
190 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
191 assert(!mr.is_empty(), "unexpected empty region"); | |
192 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
193 ((HeapWord *) mr.end())), | |
194 "markRange memory region end is not card aligned"); | |
195 // convert address range into offset range | |
196 _bm.at_put_range(heapWordToOffset(mr.start()), | |
197 heapWordToOffset(mr.end()), true); | |
198 } | |
199 | |
200 void CMBitMap::clearRange(MemRegion mr) { | |
201 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
202 assert(!mr.is_empty(), "unexpected empty region"); | |
203 // convert address range into offset range | |
204 _bm.at_put_range(heapWordToOffset(mr.start()), | |
205 heapWordToOffset(mr.end()), false); | |
206 } | |
207 | |
208 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
209 HeapWord* end_addr) { | |
210 HeapWord* start = getNextMarkedWordAddress(addr); | |
211 start = MIN2(start, end_addr); | |
212 HeapWord* end = getNextUnmarkedWordAddress(start); | |
213 end = MIN2(end, end_addr); | |
214 assert(start <= end, "Consistency check"); | |
215 MemRegion mr(start, end); | |
216 if (!mr.is_empty()) { | |
217 clearRange(mr); | |
218 } | |
219 return mr; | |
220 } | |
221 | |
222 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
223 _base(NULL), _cm(cm) | |
224 #ifdef ASSERT | |
225 , _drain_in_progress(false) | |
226 , _drain_in_progress_yields(false) | |
227 #endif | |
228 {} | |
229 | |
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230 bool CMMarkStack::allocate(size_t capacity) { |
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231 // allocate a stack of the requisite depth |
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232 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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233 if (!rs.is_reserved()) { |
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234 warning("ConcurrentMark MarkStack allocation failure"); |
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235 return false; |
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236 } |
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237 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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238 if (!_virtual_space.initialize(rs, rs.size())) { |
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239 warning("ConcurrentMark MarkStack backing store failure"); |
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240 // Release the virtual memory reserved for the marking stack |
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241 rs.release(); |
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242 return false; |
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243 } |
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244 assert(_virtual_space.committed_size() == rs.size(), |
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245 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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246 _base = (oop*) _virtual_space.low(); |
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247 setEmpty(); |
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248 _capacity = (jint) capacity; |
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249 _saved_index = -1; |
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250 _should_expand = false; |
342 | 251 NOT_PRODUCT(_max_depth = 0); |
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252 return true; |
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253 } |
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254 |
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255 void CMMarkStack::expand() { |
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256 // Called, during remark, if we've overflown the marking stack during marking. |
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257 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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258 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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259 // Clear expansion flag |
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260 _should_expand = false; |
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261 if (_capacity == (jint) MarkStackSizeMax) { |
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262 if (PrintGCDetails && Verbose) { |
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263 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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264 } |
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265 return; |
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266 } |
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267 // Double capacity if possible |
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268 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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269 // Do not give up existing stack until we have managed to |
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270 // get the double capacity that we desired. |
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271 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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272 sizeof(oop))); |
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273 if (rs.is_reserved()) { |
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274 // Release the backing store associated with old stack |
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275 _virtual_space.release(); |
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276 // Reinitialize virtual space for new stack |
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277 if (!_virtual_space.initialize(rs, rs.size())) { |
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278 fatal("Not enough swap for expanded marking stack capacity"); |
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279 } |
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280 _base = (oop*)(_virtual_space.low()); |
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281 _index = 0; |
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282 _capacity = new_capacity; |
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283 } else { |
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284 if (PrintGCDetails && Verbose) { |
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285 // Failed to double capacity, continue; |
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286 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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287 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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288 _capacity / K, new_capacity / K); |
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289 } |
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290 } |
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291 } |
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292 |
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293 void CMMarkStack::set_should_expand() { |
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294 // If we're resetting the marking state because of an |
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295 // marking stack overflow, record that we should, if |
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296 // possible, expand the stack. |
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297 _should_expand = _cm->has_overflown(); |
342 | 298 } |
299 | |
300 CMMarkStack::~CMMarkStack() { | |
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301 if (_base != NULL) { |
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302 _base = NULL; |
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303 _virtual_space.release(); |
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304 } |
342 | 305 } |
306 | |
307 void CMMarkStack::par_push(oop ptr) { | |
308 while (true) { | |
309 if (isFull()) { | |
310 _overflow = true; | |
311 return; | |
312 } | |
313 // Otherwise... | |
314 jint index = _index; | |
315 jint next_index = index+1; | |
316 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
317 if (res == index) { | |
318 _base[index] = ptr; | |
319 // Note that we don't maintain this atomically. We could, but it | |
320 // doesn't seem necessary. | |
321 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
322 return; | |
323 } | |
324 // Otherwise, we need to try again. | |
325 } | |
326 } | |
327 | |
328 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
329 while (true) { | |
330 if (isFull()) { | |
331 _overflow = true; | |
332 return; | |
333 } | |
334 // Otherwise... | |
335 jint index = _index; | |
336 jint next_index = index + n; | |
337 if (next_index > _capacity) { | |
338 _overflow = true; | |
339 return; | |
340 } | |
341 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
342 if (res == index) { | |
343 for (int i = 0; i < n; i++) { | |
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344 int ind = index + i; |
342 | 345 assert(ind < _capacity, "By overflow test above."); |
346 _base[ind] = ptr_arr[i]; | |
347 } | |
348 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
349 return; | |
350 } | |
351 // Otherwise, we need to try again. | |
352 } | |
353 } | |
354 | |
355 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
356 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
357 jint start = _index; | |
358 jint next_index = start + n; | |
359 if (next_index > _capacity) { | |
360 _overflow = true; | |
361 return; | |
362 } | |
363 // Otherwise. | |
364 _index = next_index; | |
365 for (int i = 0; i < n; i++) { | |
366 int ind = start + i; | |
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367 assert(ind < _capacity, "By overflow test above."); |
342 | 368 _base[ind] = ptr_arr[i]; |
369 } | |
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370 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
342 | 371 } |
372 | |
373 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
374 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
375 jint index = _index; | |
376 if (index == 0) { | |
377 *n = 0; | |
378 return false; | |
379 } else { | |
380 int k = MIN2(max, index); | |
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381 jint new_ind = index - k; |
342 | 382 for (int j = 0; j < k; j++) { |
383 ptr_arr[j] = _base[new_ind + j]; | |
384 } | |
385 _index = new_ind; | |
386 *n = k; | |
387 return true; | |
388 } | |
389 } | |
390 | |
391 template<class OopClosureClass> | |
392 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
393 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
394 || SafepointSynchronize::is_at_safepoint(), | |
395 "Drain recursion must be yield-safe."); | |
396 bool res = true; | |
397 debug_only(_drain_in_progress = true); | |
398 debug_only(_drain_in_progress_yields = yield_after); | |
399 while (!isEmpty()) { | |
400 oop newOop = pop(); | |
401 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
402 assert(newOop->is_oop(), "Expected an oop"); | |
403 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
404 "only grey objects on this stack"); | |
405 newOop->oop_iterate(cl); | |
406 if (yield_after && _cm->do_yield_check()) { | |
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407 res = false; |
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408 break; |
342 | 409 } |
410 } | |
411 debug_only(_drain_in_progress = false); | |
412 return res; | |
413 } | |
414 | |
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415 void CMMarkStack::note_start_of_gc() { |
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416 assert(_saved_index == -1, |
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417 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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418 _saved_index = _index; |
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419 } |
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420 |
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421 void CMMarkStack::note_end_of_gc() { |
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422 // This is intentionally a guarantee, instead of an assert. If we |
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423 // accidentally add something to the mark stack during GC, it |
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424 // will be a correctness issue so it's better if we crash. we'll |
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425 // only check this once per GC anyway, so it won't be a performance |
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426 // issue in any way. |
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427 guarantee(_saved_index == _index, |
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428 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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429 _saved_index = -1; |
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430 } |
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431 |
342 | 432 void CMMarkStack::oops_do(OopClosure* f) { |
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433 assert(_saved_index == _index, |
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434 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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435 for (int i = 0; i < _index; i += 1) { |
342 | 436 f->do_oop(&_base[i]); |
437 } | |
438 } | |
439 | |
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440 CMRootRegions::CMRootRegions() : |
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441 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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442 _should_abort(false), _next_survivor(NULL) { } |
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443 |
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444 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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445 _young_list = g1h->young_list(); |
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446 _cm = cm; |
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447 } |
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448 |
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449 void CMRootRegions::prepare_for_scan() { |
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450 assert(!scan_in_progress(), "pre-condition"); |
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451 |
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452 // Currently, only survivors can be root regions. |
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453 assert(_next_survivor == NULL, "pre-condition"); |
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454 _next_survivor = _young_list->first_survivor_region(); |
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455 _scan_in_progress = (_next_survivor != NULL); |
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456 _should_abort = false; |
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457 } |
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458 |
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459 HeapRegion* CMRootRegions::claim_next() { |
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460 if (_should_abort) { |
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461 // If someone has set the should_abort flag, we return NULL to |
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462 // force the caller to bail out of their loop. |
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463 return NULL; |
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464 } |
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465 |
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466 // Currently, only survivors can be root regions. |
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467 HeapRegion* res = _next_survivor; |
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468 if (res != NULL) { |
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469 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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470 // Read it again in case it changed while we were waiting for the lock. |
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471 res = _next_survivor; |
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472 if (res != NULL) { |
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473 if (res == _young_list->last_survivor_region()) { |
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474 // We just claimed the last survivor so store NULL to indicate |
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475 // that we're done. |
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476 _next_survivor = NULL; |
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477 } else { |
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478 _next_survivor = res->get_next_young_region(); |
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479 } |
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480 } else { |
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481 // Someone else claimed the last survivor while we were trying |
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482 // to take the lock so nothing else to do. |
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483 } |
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484 } |
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485 assert(res == NULL || res->is_survivor(), "post-condition"); |
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486 |
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487 return res; |
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488 } |
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489 |
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490 void CMRootRegions::scan_finished() { |
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491 assert(scan_in_progress(), "pre-condition"); |
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492 |
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493 // Currently, only survivors can be root regions. |
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494 if (!_should_abort) { |
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495 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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496 } |
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497 _next_survivor = NULL; |
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498 |
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499 { |
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500 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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501 _scan_in_progress = false; |
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502 RootRegionScan_lock->notify_all(); |
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503 } |
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504 } |
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505 |
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506 bool CMRootRegions::wait_until_scan_finished() { |
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507 if (!scan_in_progress()) return false; |
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508 |
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509 { |
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510 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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511 while (scan_in_progress()) { |
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512 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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513 } |
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514 } |
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515 return true; |
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516 } |
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517 |
342 | 518 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
519 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
520 #endif // _MSC_VER | |
521 | |
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522 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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523 return MAX2((n_par_threads + 2) / 4, 1U); |
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524 } |
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525 |
20337 | 526 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, G1RegionToSpaceMapper* prev_bitmap_storage, G1RegionToSpaceMapper* next_bitmap_storage) : |
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527 _g1h(g1h), |
20337 | 528 _markBitMap1(), |
529 _markBitMap2(), | |
342 | 530 _parallel_marking_threads(0), |
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531 _max_parallel_marking_threads(0), |
342 | 532 _sleep_factor(0.0), |
533 _marking_task_overhead(1.0), | |
534 _cleanup_sleep_factor(0.0), | |
535 _cleanup_task_overhead(1.0), | |
2152 | 536 _cleanup_list("Cleanup List"), |
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537 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
20337 | 538 _card_bm((g1h->reserved_region().byte_size() + CardTableModRefBS::card_size - 1) >> |
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539 CardTableModRefBS::card_shift, |
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540 false /* in_resource_area*/), |
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541 |
342 | 542 _prevMarkBitMap(&_markBitMap1), |
543 _nextMarkBitMap(&_markBitMap2), | |
544 | |
545 _markStack(this), | |
546 // _finger set in set_non_marking_state | |
547 | |
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548 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 549 // _active_tasks set in set_non_marking_state |
550 // _tasks set inside the constructor | |
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551 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
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552 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
342 | 553 |
554 _has_overflown(false), | |
555 _concurrent(false), | |
619
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556 _has_aborted(false), |
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557 _aborted_gc_id(GCId::undefined()), |
619
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558 _restart_for_overflow(false), |
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559 _concurrent_marking_in_progress(false), |
342 | 560 |
561 // _verbose_level set below | |
562 | |
563 _init_times(), | |
564 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
565 _cleanup_times(), | |
566 _total_counting_time(0.0), | |
567 _total_rs_scrub_time(0.0), | |
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568 |
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569 _parallel_workers(NULL), |
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570 |
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571 _count_card_bitmaps(NULL), |
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572 _count_marked_bytes(NULL), |
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573 _completed_initialization(false) { |
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574 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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575 if (verbose_level < no_verbose) { |
342 | 576 verbose_level = no_verbose; |
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577 } |
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578 if (verbose_level > high_verbose) { |
342 | 579 verbose_level = high_verbose; |
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580 } |
342 | 581 _verbose_level = verbose_level; |
582 | |
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583 if (verbose_low()) { |
342 | 584 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
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585 "heap end = " INTPTR_FORMAT, p2i(_heap_start), p2i(_heap_end)); |
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586 } |
342 | 587 |
20337 | 588 _markBitMap1.initialize(g1h->reserved_region(), prev_bitmap_storage); |
589 _markBitMap2.initialize(g1h->reserved_region(), next_bitmap_storage); | |
342 | 590 |
591 // Create & start a ConcurrentMark thread. | |
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592 _cmThread = new ConcurrentMarkThread(this); |
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593 assert(cmThread() != NULL, "CM Thread should have been created"); |
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594 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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595 if (_cmThread->osthread() == NULL) { |
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596 vm_shutdown_during_initialization("Could not create ConcurrentMarkThread"); |
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597 } |
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598 |
342 | 599 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
20337 | 600 assert(_markBitMap1.covers(g1h->reserved_region()), "_markBitMap1 inconsistency"); |
601 assert(_markBitMap2.covers(g1h->reserved_region()), "_markBitMap2 inconsistency"); | |
342 | 602 |
603 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 604 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 605 |
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606 _root_regions.init(_g1h, this); |
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607 |
1284 | 608 if (ConcGCThreads > ParallelGCThreads) { |
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609 warning("Can't have more ConcGCThreads (" UINTX_FORMAT ") " |
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610 "than ParallelGCThreads (" UINTX_FORMAT ").", |
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611 ConcGCThreads, ParallelGCThreads); |
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612 return; |
342 | 613 } |
614 if (ParallelGCThreads == 0) { | |
615 // if we are not running with any parallel GC threads we will not | |
616 // spawn any marking threads either | |
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617 _parallel_marking_threads = 0; |
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618 _max_parallel_marking_threads = 0; |
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619 _sleep_factor = 0.0; |
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620 _marking_task_overhead = 1.0; |
342 | 621 } else { |
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622 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
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623 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
342 | 624 // if both are set |
625 _sleep_factor = 0.0; | |
626 _marking_task_overhead = 1.0; | |
751 | 627 } else if (G1MarkingOverheadPercent > 0) { |
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628 // We will calculate the number of parallel marking threads based |
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629 // on a target overhead with respect to the soft real-time goal |
751 | 630 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 631 double overall_cm_overhead = |
751 | 632 (double) MaxGCPauseMillis * marking_overhead / |
633 (double) GCPauseIntervalMillis; | |
342 | 634 double cpu_ratio = 1.0 / (double) os::processor_count(); |
635 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
636 double marking_task_overhead = | |
637 overall_cm_overhead / marking_thread_num * | |
638 (double) os::processor_count(); | |
639 double sleep_factor = | |
640 (1.0 - marking_task_overhead) / marking_task_overhead; | |
641 | |
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642 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
342 | 643 _sleep_factor = sleep_factor; |
644 _marking_task_overhead = marking_task_overhead; | |
645 } else { | |
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646 // Calculate the number of parallel marking threads by scaling |
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647 // the number of parallel GC threads. |
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648 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
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649 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
342 | 650 _sleep_factor = 0.0; |
651 _marking_task_overhead = 1.0; | |
652 } | |
653 | |
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654 assert(ConcGCThreads > 0, "Should have been set"); |
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655 _parallel_marking_threads = (uint) ConcGCThreads; |
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656 _max_parallel_marking_threads = _parallel_marking_threads; |
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657 |
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658 if (parallel_marking_threads() > 1) { |
342 | 659 _cleanup_task_overhead = 1.0; |
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660 } else { |
342 | 661 _cleanup_task_overhead = marking_task_overhead(); |
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662 } |
342 | 663 _cleanup_sleep_factor = |
664 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
665 | |
666 #if 0 | |
667 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
668 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
669 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
670 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
671 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
672 #endif | |
673 | |
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674 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
1833
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|
675 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
4728
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7121618: Change type of number of GC workers to unsigned int.
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4711
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|
676 _max_parallel_marking_threads, false, true); |
1833
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6984287: Regularize how GC parallel workers are specified.
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|
677 if (_parallel_workers == NULL) { |
342 | 678 vm_exit_during_initialization("Failed necessary allocation."); |
1833
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|
679 } else { |
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|
680 _parallel_workers->initialize_workers(); |
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|
681 } |
342 | 682 } |
683 | |
7397
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|
684 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
442f942757c0
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|
685 uintx mark_stack_size = |
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|
686 MIN2(MarkStackSizeMax, |
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|
687 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
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688 // Verify that the calculated value for MarkStackSize is in range. |
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|
689 // It would be nice to use the private utility routine from Arguments. |
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|
690 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
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|
691 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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|
692 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
17937
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|
693 mark_stack_size, (uintx) 1, MarkStackSizeMax); |
7397
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|
694 return; |
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|
695 } |
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|
696 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
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|
697 } else { |
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|
698 // Verify MarkStackSize is in range. |
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699 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
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|
700 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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|
701 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
442f942757c0
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|
702 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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|
703 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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|
704 MarkStackSize, (uintx) 1, MarkStackSizeMax); |
7397
442f942757c0
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|
705 return; |
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|
706 } |
442f942757c0
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|
707 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
442f942757c0
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|
708 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
442f942757c0
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|
709 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
442f942757c0
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|
710 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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|
711 MarkStackSize, MarkStackSizeMax); |
442f942757c0
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|
712 return; |
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|
713 } |
442f942757c0
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|
714 } |
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|
715 } |
442f942757c0
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diff
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|
716 } |
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|
717 |
442f942757c0
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|
718 if (!_markStack.allocate(MarkStackSize)) { |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
719 warning("Failed to allocate CM marking stack"); |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
720 return; |
442f942757c0
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|
721 } |
442f942757c0
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|
722 |
442f942757c0
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|
723 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
442f942757c0
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|
724 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
725 |
442f942757c0
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|
726 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
442f942757c0
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727 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
442f942757c0
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|
728 |
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|
729 BitMap::idx_t card_bm_size = _card_bm.size(); |
442f942757c0
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|
730 |
442f942757c0
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|
731 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
442f942757c0
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732 _active_tasks = _max_worker_id; |
442f942757c0
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|
733 |
442f942757c0
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|
734 size_t max_regions = (size_t) _g1h->max_regions(); |
442f942757c0
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|
735 for (uint i = 0; i < _max_worker_id; ++i) { |
442f942757c0
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|
736 CMTaskQueue* task_queue = new CMTaskQueue(); |
442f942757c0
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|
737 task_queue->initialize(); |
442f942757c0
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|
738 _task_queues->register_queue(i, task_queue); |
442f942757c0
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|
739 |
442f942757c0
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|
740 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
442f942757c0
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|
741 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
442f942757c0
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|
742 |
442f942757c0
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|
743 _tasks[i] = new CMTask(i, this, |
442f942757c0
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|
744 _count_marked_bytes[i], |
442f942757c0
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|
745 &_count_card_bitmaps[i], |
442f942757c0
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|
746 task_queue, _task_queues); |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
747 |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
748 _accum_task_vtime[i] = 0.0; |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
749 } |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
750 |
442f942757c0
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diff
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|
751 // Calculate the card number for the bottom of the heap. Used |
442f942757c0
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|
752 // in biasing indexes into the accounting card bitmaps. |
442f942757c0
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|
753 _heap_bottom_card_num = |
442f942757c0
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|
754 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
442f942757c0
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|
755 CardTableModRefBS::card_shift); |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
756 |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
757 // Clear all the liveness counting data |
442f942757c0
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|
758 clear_all_count_data(); |
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|
759 |
342 | 760 // so that the call below can read a sensible value |
20337 | 761 _heap_start = g1h->reserved_region().start(); |
342 | 762 set_non_marking_state(); |
7397
442f942757c0
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|
763 _completed_initialization = true; |
342 | 764 } |
765 | |
766 void ConcurrentMark::reset() { | |
767 // Starting values for these two. This should be called in a STW | |
20337 | 768 // phase. |
769 MemRegion reserved = _g1h->g1_reserved(); | |
770 _heap_start = reserved.start(); | |
771 _heap_end = reserved.end(); | |
342 | 772 |
1023
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|
773 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
774 assert(_heap_start != NULL, "heap bounds should look ok"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
775 assert(_heap_end != NULL, "heap bounds should look ok"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
changeset
|
776 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 777 |
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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diff
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|
778 // Reset all the marking data structures and any necessary flags |
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changeset
|
779 reset_marking_state(); |
342 | 780 |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
781 if (verbose_low()) { |
342 | 782 gclog_or_tty->print_cr("[global] resetting"); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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diff
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|
783 } |
342 | 784 |
785 // We do reset all of them, since different phases will use | |
786 // different number of active threads. So, it's easiest to have all | |
787 // of them ready. | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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diff
changeset
|
788 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 789 _tasks[i]->reset(_nextMarkBitMap); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
790 } |
342 | 791 |
792 // we need this to make sure that the flag is on during the evac | |
793 // pause with initial mark piggy-backed | |
794 set_concurrent_marking_in_progress(); | |
795 } | |
796 | |
7450
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|
797 |
d275c3dc73e6
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changeset
|
798 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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diff
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|
799 _markStack.set_should_expand(); |
d275c3dc73e6
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diff
changeset
|
800 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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diff
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|
801 if (clear_overflow) { |
d275c3dc73e6
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diff
changeset
|
802 clear_has_overflown(); |
d275c3dc73e6
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diff
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|
803 } else { |
d275c3dc73e6
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|
804 assert(has_overflown(), "pre-condition"); |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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|
805 } |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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diff
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|
806 _finger = _heap_start; |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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|
807 |
d275c3dc73e6
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diff
changeset
|
808 for (uint i = 0; i < _max_worker_id; ++i) { |
d275c3dc73e6
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|
809 CMTaskQueue* queue = _task_queues->queue(i); |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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|
810 queue->set_empty(); |
d275c3dc73e6
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|
811 } |
d275c3dc73e6
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diff
changeset
|
812 } |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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diff
changeset
|
813 |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
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8787
diff
changeset
|
814 void ConcurrentMark::set_concurrency(uint active_tasks) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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diff
changeset
|
815 assert(active_tasks <= _max_worker_id, "we should not have more"); |
342 | 816 |
817 _active_tasks = active_tasks; | |
818 // Need to update the three data structures below according to the | |
819 // number of active threads for this phase. | |
820 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
821 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
822 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
8788
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823 } |
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824 |
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825 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
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826 set_concurrency(active_tasks); |
342 | 827 |
828 _concurrent = concurrent; | |
829 // We propagate this to all tasks, not just the active ones. | |
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830 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 831 _tasks[i]->set_concurrent(concurrent); |
832 | |
833 if (concurrent) { | |
834 set_concurrent_marking_in_progress(); | |
835 } else { | |
836 // We currently assume that the concurrent flag has been set to | |
837 // false before we start remark. At this point we should also be | |
838 // in a STW phase. | |
1023
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839 assert(!concurrent_marking_in_progress(), "invariant"); |
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840 assert(out_of_regions(), |
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841 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
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842 p2i(_finger), p2i(_heap_end))); |
342 | 843 } |
844 } | |
845 | |
846 void ConcurrentMark::set_non_marking_state() { | |
847 // We set the global marking state to some default values when we're | |
848 // not doing marking. | |
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849 reset_marking_state(); |
342 | 850 _active_tasks = 0; |
851 clear_concurrent_marking_in_progress(); | |
852 } | |
853 | |
854 ConcurrentMark::~ConcurrentMark() { | |
4735 | 855 // The ConcurrentMark instance is never freed. |
856 ShouldNotReachHere(); | |
342 | 857 } |
858 | |
859 void ConcurrentMark::clearNextBitmap() { | |
1359
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860 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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861 |
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862 // Make sure that the concurrent mark thread looks to still be in |
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863 // the current cycle. |
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864 guarantee(cmThread()->during_cycle(), "invariant"); |
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865 |
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866 // We are finishing up the current cycle by clearing the next |
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867 // marking bitmap and getting it ready for the next cycle. During |
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868 // this time no other cycle can start. So, let's make sure that this |
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869 // is the case. |
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870 guarantee(!g1h->mark_in_progress(), "invariant"); |
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871 |
20337 | 872 ClearBitmapHRClosure cl(this, _nextMarkBitMap, true /* may_yield */); |
873 g1h->heap_region_iterate(&cl); | |
874 | |
875 // Clear the liveness counting data. If the marking has been aborted, the abort() | |
876 // call already did that. | |
877 if (cl.complete()) { | |
878 clear_all_count_data(); | |
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879 } |
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880 |
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881 // Repeat the asserts from above. |
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882 guarantee(cmThread()->during_cycle(), "invariant"); |
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883 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 884 } |
885 | |
20337 | 886 class CheckBitmapClearHRClosure : public HeapRegionClosure { |
887 CMBitMap* _bitmap; | |
888 bool _error; | |
889 public: | |
890 CheckBitmapClearHRClosure(CMBitMap* bitmap) : _bitmap(bitmap) { | |
891 } | |
892 | |
893 virtual bool doHeapRegion(HeapRegion* r) { | |
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894 // This closure can be called concurrently to the mutator, so we must make sure |
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895 // that the result of the getNextMarkedWordAddress() call is compared to the |
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896 // value passed to it as limit to detect any found bits. |
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897 // We can use the region's orig_end() for the limit and the comparison value |
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898 // as it always contains the "real" end of the region that never changes and |
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899 // has no side effects. |
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900 // Due to the latter, there can also be no problem with the compiler generating |
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901 // reloads of the orig_end() call. |
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902 HeapWord* end = r->orig_end(); |
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903 return _bitmap->getNextMarkedWordAddress(r->bottom(), end) != end; |
20337 | 904 } |
905 }; | |
906 | |
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907 bool ConcurrentMark::nextMarkBitmapIsClear() { |
20337 | 908 CheckBitmapClearHRClosure cl(_nextMarkBitMap); |
909 _g1h->heap_region_iterate(&cl); | |
910 return cl.complete(); | |
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911 } |
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912 |
342 | 913 class NoteStartOfMarkHRClosure: public HeapRegionClosure { |
914 public: | |
915 bool doHeapRegion(HeapRegion* r) { | |
916 if (!r->continuesHumongous()) { | |
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917 r->note_start_of_marking(); |
342 | 918 } |
919 return false; | |
920 } | |
921 }; | |
922 | |
923 void ConcurrentMark::checkpointRootsInitialPre() { | |
924 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
925 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
926 | |
927 _has_aborted = false; | |
928 | |
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929 #ifndef PRODUCT |
1044 | 930 if (G1PrintReachableAtInitialMark) { |
1388 | 931 print_reachable("at-cycle-start", |
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932 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 933 } |
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934 #endif |
342 | 935 |
936 // Initialise marking structures. This has to be done in a STW phase. | |
937 reset(); | |
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938 |
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939 // For each region note start of marking. |
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940 NoteStartOfMarkHRClosure startcl; |
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941 g1h->heap_region_iterate(&startcl); |
342 | 942 } |
943 | |
944 | |
945 void ConcurrentMark::checkpointRootsInitialPost() { | |
946 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
947 | |
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948 // If we force an overflow during remark, the remark operation will |
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949 // actually abort and we'll restart concurrent marking. If we always |
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950 // force an oveflow during remark we'll never actually complete the |
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951 // marking phase. So, we initilize this here, at the start of the |
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952 // cycle, so that at the remaining overflow number will decrease at |
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953 // every remark and we'll eventually not need to cause one. |
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954 force_overflow_stw()->init(); |
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955 |
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956 // Start Concurrent Marking weak-reference discovery. |
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957 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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958 // enable ("weak") refs discovery |
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959 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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960 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 961 |
962 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
1317
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963 // This is the start of the marking cycle, we're expected all |
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964 // threads to have SATB queues with active set to false. |
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965 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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966 false /* expected_active */); |
342 | 967 |
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968 _root_regions.prepare_for_scan(); |
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969 |
342 | 970 // update_g1_committed() will be called at the end of an evac pause |
971 // when marking is on. So, it's also called at the end of the | |
972 // initial-mark pause to update the heap end, if the heap expands | |
973 // during it. No need to call it here. | |
974 } | |
975 | |
976 /* | |
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977 * Notice that in the next two methods, we actually leave the STS |
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978 * during the barrier sync and join it immediately afterwards. If we |
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979 * do not do this, the following deadlock can occur: one thread could |
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980 * be in the barrier sync code, waiting for the other thread to also |
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981 * sync up, whereas another one could be trying to yield, while also |
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982 * waiting for the other threads to sync up too. |
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983 * |
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984 * Note, however, that this code is also used during remark and in |
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985 * this case we should not attempt to leave / enter the STS, otherwise |
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986 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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987 * (product). So we should only leave / enter the STS if we are |
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988 * operating concurrently. |
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989 * |
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990 * Because the thread that does the sync barrier has left the STS, it |
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991 * is possible to be suspended for a Full GC or an evacuation pause |
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992 * could occur. This is actually safe, since the entering the sync |
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993 * barrier is one of the last things do_marking_step() does, and it |
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994 * doesn't manipulate any data structures afterwards. |
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995 */ |
342 | 996 |
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997 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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998 if (verbose_low()) { |
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999 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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1000 } |
342 | 1001 |
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1002 if (concurrent()) { |
20192 | 1003 SuspendibleThreadSet::leave(); |
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1004 } |
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1005 |
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1006 bool barrier_aborted = !_first_overflow_barrier_sync.enter(); |
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1007 |
3316
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1008 if (concurrent()) { |
20192 | 1009 SuspendibleThreadSet::join(); |
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1010 } |
342 | 1011 // at this point everyone should have synced up and not be doing any |
1012 // more work | |
1013 | |
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1014 if (verbose_low()) { |
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1015 if (barrier_aborted) { |
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1016 gclog_or_tty->print_cr("[%u] aborted first barrier", worker_id); |
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1017 } else { |
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1018 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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1019 } |
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1020 } |
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1021 |
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1022 if (barrier_aborted) { |
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1023 // If the barrier aborted we ignore the overflow condition and |
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1024 // just abort the whole marking phase as quickly as possible. |
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1025 return; |
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1026 } |
342 | 1027 |
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1028 // If we're executing the concurrent phase of marking, reset the marking |
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1029 // state; otherwise the marking state is reset after reference processing, |
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1030 // during the remark pause. |
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1031 // If we reset here as a result of an overflow during the remark we will |
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1032 // see assertion failures from any subsequent set_concurrency_and_phase() |
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1033 // calls. |
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1034 if (concurrent()) { |
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1035 // let the task associated with with worker 0 do this |
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1036 if (worker_id == 0) { |
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1037 // task 0 is responsible for clearing the global data structures |
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1038 // We should be here because of an overflow. During STW we should |
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1039 // not clear the overflow flag since we rely on it being true when |
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1040 // we exit this method to abort the pause and restart concurent |
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1041 // marking. |
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1042 reset_marking_state(true /* clear_overflow */); |
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1043 force_overflow()->update(); |
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1044 |
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1045 if (G1Log::fine()) { |
20190
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1046 gclog_or_tty->gclog_stamp(concurrent_gc_id()); |
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1047 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
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1048 } |
342 | 1049 } |
1050 } | |
1051 | |
1052 // after this, each task should reset its own data structures then | |
1053 // then go into the second barrier | |
1054 } | |
1055 | |
6862
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1056 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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1057 if (verbose_low()) { |
6862
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1058 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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1059 } |
342 | 1060 |
3316
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1061 if (concurrent()) { |
20192 | 1062 SuspendibleThreadSet::leave(); |
3316
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1063 } |
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1064 |
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1065 bool barrier_aborted = !_second_overflow_barrier_sync.enter(); |
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1066 |
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1067 if (concurrent()) { |
20192 | 1068 SuspendibleThreadSet::join(); |
3316
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1069 } |
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1070 // at this point everything should be re-initialized and ready to go |
342 | 1071 |
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1072 if (verbose_low()) { |
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1073 if (barrier_aborted) { |
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1074 gclog_or_tty->print_cr("[%u] aborted second barrier", worker_id); |
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1075 } else { |
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1076 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1077 } |
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1078 } |
342 | 1079 } |
1080 | |
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1081 #ifndef PRODUCT |
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1082 void ForceOverflowSettings::init() { |
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1083 _num_remaining = G1ConcMarkForceOverflow; |
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1084 _force = false; |
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1085 update(); |
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1086 } |
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1087 |
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1088 void ForceOverflowSettings::update() { |
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1089 if (_num_remaining > 0) { |
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1090 _num_remaining -= 1; |
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1091 _force = true; |
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1092 } else { |
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1093 _force = false; |
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1094 } |
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1095 } |
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1096 |
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1097 bool ForceOverflowSettings::should_force() { |
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1098 if (_force) { |
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1099 _force = false; |
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1100 return true; |
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1101 } else { |
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1102 return false; |
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1103 } |
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1104 } |
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1105 #endif // !PRODUCT |
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1106 |
342 | 1107 class CMConcurrentMarkingTask: public AbstractGangTask { |
1108 private: | |
1109 ConcurrentMark* _cm; | |
1110 ConcurrentMarkThread* _cmt; | |
1111 | |
1112 public: | |
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1113 void work(uint worker_id) { |
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1114 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1115 "this should only be done by a conc GC thread"); |
1974
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1116 ResourceMark rm; |
342 | 1117 |
1118 double start_vtime = os::elapsedVTime(); | |
1119 | |
20192 | 1120 SuspendibleThreadSet::join(); |
342 | 1121 |
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1122 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1123 CMTask* the_task = _cm->task(worker_id); |
342 | 1124 the_task->record_start_time(); |
1125 if (!_cm->has_aborted()) { | |
1126 do { | |
1127 double start_vtime_sec = os::elapsedVTime(); | |
2174
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1128 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1129 |
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1130 the_task->do_marking_step(mark_step_duration_ms, |
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1131 true /* do_termination */, |
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1132 false /* is_serial*/); |
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1133 |
342 | 1134 double end_vtime_sec = os::elapsedVTime(); |
1135 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1136 _cm->clear_has_overflown(); | |
1137 | |
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1138 _cm->do_yield_check(worker_id); |
342 | 1139 |
1140 jlong sleep_time_ms; | |
1141 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1142 sleep_time_ms = | |
1143 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
20192 | 1144 SuspendibleThreadSet::leave(); |
342 | 1145 os::sleep(Thread::current(), sleep_time_ms, false); |
20192 | 1146 SuspendibleThreadSet::join(); |
342 | 1147 } |
1148 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1149 } | |
1150 the_task->record_end_time(); | |
1023
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1151 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1152 |
20192 | 1153 SuspendibleThreadSet::leave(); |
342 | 1154 |
1155 double end_vtime = os::elapsedVTime(); | |
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1156 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1157 } |
1158 | |
1159 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1160 ConcurrentMarkThread* cmt) : | |
1161 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1162 | |
1163 ~CMConcurrentMarkingTask() { } | |
1164 }; | |
1165 | |
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1166 // Calculates the number of active workers for a concurrent |
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1167 // phase. |
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1168 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1169 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1170 uint n_conc_workers = 0; |
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1171 if (!UseDynamicNumberOfGCThreads || |
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1172 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1173 !ForceDynamicNumberOfGCThreads)) { |
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1174 n_conc_workers = max_parallel_marking_threads(); |
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1175 } else { |
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1176 n_conc_workers = |
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1177 AdaptiveSizePolicy::calc_default_active_workers( |
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1178 max_parallel_marking_threads(), |
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1179 1, /* Minimum workers */ |
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1180 parallel_marking_threads(), |
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1181 Threads::number_of_non_daemon_threads()); |
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1182 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1183 // that scaling has already gone into "_max_parallel_marking_threads". |
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1184 } |
4711 | 1185 assert(n_conc_workers > 0, "Always need at least 1"); |
1186 return n_conc_workers; | |
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1187 } |
4711 | 1188 // If we are not running with any parallel GC threads we will not |
1189 // have spawned any marking threads either. Hence the number of | |
1190 // concurrent workers should be 0. | |
1191 return 0; | |
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1192 } |
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1193 |
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1194 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1195 // Currently, only survivors can be root regions. |
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1196 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1197 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1198 |
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1199 const uintx interval = PrefetchScanIntervalInBytes; |
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1200 HeapWord* curr = hr->bottom(); |
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1201 const HeapWord* end = hr->top(); |
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1202 while (curr < end) { |
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1203 Prefetch::read(curr, interval); |
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1204 oop obj = oop(curr); |
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1205 int size = obj->oop_iterate(&cl); |
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1206 assert(size == obj->size(), "sanity"); |
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1207 curr += size; |
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1208 } |
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1209 } |
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1210 |
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1211 class CMRootRegionScanTask : public AbstractGangTask { |
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1212 private: |
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1213 ConcurrentMark* _cm; |
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1214 |
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1215 public: |
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1216 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1217 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1218 |
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1219 void work(uint worker_id) { |
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1220 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1221 "this should only be done by a conc GC thread"); |
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1222 |
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1223 CMRootRegions* root_regions = _cm->root_regions(); |
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1224 HeapRegion* hr = root_regions->claim_next(); |
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1225 while (hr != NULL) { |
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1226 _cm->scanRootRegion(hr, worker_id); |
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1227 hr = root_regions->claim_next(); |
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1228 } |
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1229 } |
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1230 }; |
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1231 |
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1232 void ConcurrentMark::scanRootRegions() { |
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1233 // Start of concurrent marking. |
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1234 ClassLoaderDataGraph::clear_claimed_marks(); |
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1235 |
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1236 // scan_in_progress() will have been set to true only if there was |
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1237 // at least one root region to scan. So, if it's false, we |
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1238 // should not attempt to do any further work. |
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1239 if (root_regions()->scan_in_progress()) { |
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1240 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1241 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1242 "Maximum number of marking threads exceeded"); |
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1243 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1244 |
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1245 CMRootRegionScanTask task(this); |
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1246 if (use_parallel_marking_threads()) { |
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1247 _parallel_workers->set_active_workers((int) active_workers); |
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1248 _parallel_workers->run_task(&task); |
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1249 } else { |
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1250 task.work(0); |
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1251 } |
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1252 |
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1253 // It's possible that has_aborted() is true here without actually |
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1254 // aborting the survivor scan earlier. This is OK as it's |
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1255 // mainly used for sanity checking. |
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1256 root_regions()->scan_finished(); |
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1257 } |
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1258 } |
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1259 |
342 | 1260 void ConcurrentMark::markFromRoots() { |
1261 // we might be tempted to assert that: | |
1262 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1263 // "inconsistent argument?"); | |
1264 // However that wouldn't be right, because it's possible that | |
1265 // a safepoint is indeed in progress as a younger generation | |
1266 // stop-the-world GC happens even as we mark in this generation. | |
1267 | |
1268 _restart_for_overflow = false; | |
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1269 force_overflow_conc()->init(); |
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1270 |
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1271 // _g1h has _n_par_threads |
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1272 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1273 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1274 "Maximum number of marking threads exceeded"); |
4711 | 1275 |
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1276 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1277 |
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1278 // Parallel task terminator is set in "set_concurrency_and_phase()" |
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1279 set_concurrency_and_phase(active_workers, true /* concurrent */); |
342 | 1280 |
1281 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1282 if (use_parallel_marking_threads()) { |
4711 | 1283 _parallel_workers->set_active_workers((int)active_workers); |
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1284 // Don't set _n_par_threads because it affects MT in process_roots() |
4711 | 1285 // and the decisions on that MT processing is made elsewhere. |
1286 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1287 _parallel_workers->run_task(&markingTask); |
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1288 } else { |
342 | 1289 markingTask.work(0); |
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1290 } |
342 | 1291 print_stats(); |
1292 } | |
1293 | |
1294 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1295 // world is stopped at this checkpoint | |
1296 assert(SafepointSynchronize::is_at_safepoint(), | |
1297 "world should be stopped"); | |
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1298 |
342 | 1299 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1300 | |
1301 // If a full collection has happened, we shouldn't do this. | |
1302 if (has_aborted()) { | |
1303 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1304 return; | |
1305 } | |
1306 | |
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1307 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1308 |
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1309 if (VerifyDuringGC) { |
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1310 HandleMark hm; // handle scope |
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1311 Universe::heap()->prepare_for_verify(); |
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1312 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1313 " VerifyDuringGC:(before)"); |
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1314 } |
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1315 g1h->check_bitmaps("Remark Start"); |
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1316 |
342 | 1317 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1318 g1p->record_concurrent_mark_remark_start(); | |
1319 | |
1320 double start = os::elapsedTime(); | |
1321 | |
1322 checkpointRootsFinalWork(); | |
1323 | |
1324 double mark_work_end = os::elapsedTime(); | |
1325 | |
1326 weakRefsWork(clear_all_soft_refs); | |
1327 | |
1328 if (has_overflown()) { | |
1329 // Oops. We overflowed. Restart concurrent marking. | |
1330 _restart_for_overflow = true; | |
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1331 if (G1TraceMarkStackOverflow) { |
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1332 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1333 } |
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1334 |
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1335 // Verify the heap w.r.t. the previous marking bitmap. |
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1336 if (VerifyDuringGC) { |
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1337 HandleMark hm; // handle scope |
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1338 Universe::heap()->prepare_for_verify(); |
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1339 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1340 " VerifyDuringGC:(overflow)"); |
8789
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1341 } |
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1342 |
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1343 // Clear the marking state because we will be restarting |
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1344 // marking due to overflowing the global mark stack. |
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1345 reset_marking_state(); |
342 | 1346 } else { |
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1347 // Aggregate the per-task counting data that we have accumulated |
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1348 // while marking. |
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1349 aggregate_count_data(); |
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1350 |
2149 | 1351 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1352 // We're done with marking. |
1317
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1353 // This is the end of the marking cycle, we're expected all |
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1354 // threads to have SATB queues with active set to true. |
2149 | 1355 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1356 true /* expected_active */); | |
811 | 1357 |
1358 if (VerifyDuringGC) { | |
845
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1359 HandleMark hm; // handle scope |
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1360 Universe::heap()->prepare_for_verify(); |
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1361 Universe::verify(VerifyOption_G1UseNextMarking, |
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1362 " VerifyDuringGC:(after)"); |
811 | 1363 } |
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1364 g1h->check_bitmaps("Remark End"); |
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1365 assert(!restart_for_overflow(), "sanity"); |
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1366 // Completely reset the marking state since marking completed |
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1367 set_non_marking_state(); |
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1368 } |
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1369 |
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1370 // Expand the marking stack, if we have to and if we can. |
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1371 if (_markStack.should_expand()) { |
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1372 _markStack.expand(); |
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1373 } |
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1374 |
342 | 1375 // Statistics |
1376 double now = os::elapsedTime(); | |
1377 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1378 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1379 _remark_times.add((now - start) * 1000.0); | |
1380 | |
1381 g1p->record_concurrent_mark_remark_end(); | |
10405 | 1382 |
1383 G1CMIsAliveClosure is_alive(g1h); | |
1384 g1h->gc_tracer_cm()->report_object_count_after_gc(&is_alive); | |
342 | 1385 } |
1386 | |
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1387 // Base class of the closures that finalize and verify the |
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1388 // liveness counting data. |
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1389 class CMCountDataClosureBase: public HeapRegionClosure { |
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1390 protected: |
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1391 G1CollectedHeap* _g1h; |
342 | 1392 ConcurrentMark* _cm; |
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1393 CardTableModRefBS* _ct_bs; |
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1394 |
342 | 1395 BitMap* _region_bm; |
1396 BitMap* _card_bm; | |
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1397 |
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1398 // Takes a region that's not empty (i.e., it has at least one |
829 | 1399 // live object in it and sets its corresponding bit on the region |
1400 // bitmap to 1. If the region is "starts humongous" it will also set | |
1401 // to 1 the bits on the region bitmap that correspond to its | |
1402 // associated "continues humongous" regions. | |
1403 void set_bit_for_region(HeapRegion* hr) { | |
1404 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1405 | |
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1406 BitMap::idx_t index = (BitMap::idx_t) hr->hrm_index(); |
829 | 1407 if (!hr->startsHumongous()) { |
1408 // Normal (non-humongous) case: just set the bit. | |
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1409 _region_bm->par_at_put(index, true); |
829 | 1410 } else { |
1411 // Starts humongous case: calculate how many regions are part of | |
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1412 // this humongous region and then set the bit range. |
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1413 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
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1414 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1415 } |
1416 } | |
1417 | |
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1418 public: |
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1419 CMCountDataClosureBase(G1CollectedHeap* g1h, |
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1420 BitMap* region_bm, BitMap* card_bm): |
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1421 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1422 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1423 _region_bm(region_bm), _card_bm(card_bm) { } |
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1424 }; |
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1425 |
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1426 // Closure that calculates the # live objects per region. Used |
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1427 // for verification purposes during the cleanup pause. |
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1428 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1429 CMBitMapRO* _bm; |
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1430 size_t _region_marked_bytes; |
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1431 |
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1432 public: |
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1433 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1434 BitMap* region_bm, BitMap* card_bm) : |
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1435 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1436 _bm(bm), _region_marked_bytes(0) { } |
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1437 |
342 | 1438 bool doHeapRegion(HeapRegion* hr) { |
1439 | |
639 | 1440 if (hr->continuesHumongous()) { |
829 | 1441 // We will ignore these here and process them when their |
1442 // associated "starts humongous" region is processed (see | |
1443 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1444 // associated "starts humongous" region to have their bit set to | |
1445 // 1 since, due to the region chunking in the parallel region | |
1446 // iteration, a "continues humongous" region might be visited | |
1447 // before its associated "starts humongous". | |
639 | 1448 return false; |
1449 } | |
342 | 1450 |
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1451 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1452 HeapWord* start = hr->bottom(); |
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1453 |
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1454 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1455 err_msg("Preconditions not met - " |
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1456 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1457 p2i(start), p2i(ntams), p2i(hr->end()))); |
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1458 |
342 | 1459 // Find the first marked object at or after "start". |
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1460 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1461 |
342 | 1462 size_t marked_bytes = 0; |
1463 | |
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1464 while (start < ntams) { |
342 | 1465 oop obj = oop(start); |
1466 int obj_sz = obj->size(); | |
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1467 HeapWord* obj_end = start + obj_sz; |
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1468 |
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1469 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1470 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1471 |
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1472 // Note: if we're looking at the last region in heap - obj_end |
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1473 // could be actually just beyond the end of the heap; end_idx |
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1474 // will then correspond to a (non-existent) card that is also |
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1475 // just beyond the heap. |
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1476 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1477 // end of object is not card aligned - increment to cover |
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1478 // all the cards spanned by the object |
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1479 end_idx += 1; |
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1480 } |
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1481 |
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1482 // Set the bits in the card BM for the cards spanned by this object. |
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1483 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1484 |
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1485 // Add the size of this object to the number of marked bytes. |
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1486 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1487 |
342 | 1488 // Find the next marked object after this one. |
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1489 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1490 } |
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1491 |
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1492 // Mark the allocated-since-marking portion... |
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1493 HeapWord* top = hr->top(); |
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1494 if (ntams < top) { |
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1495 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1496 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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|
1497 |
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1498 // Note: if we're looking at the last region in heap - top |
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1499 // could be actually just beyond the end of the heap; end_idx |
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1500 // will then correspond to a (non-existent) card that is also |
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1501 // just beyond the heap. |
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1502 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1503 // end of object is not card aligned - increment to cover |
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1504 // all the cards spanned by the object |
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1505 end_idx += 1; |
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1506 } |
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1507 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1508 |
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1509 // This definitely means the region has live objects. |
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1510 set_bit_for_region(hr); |
342 | 1511 } |
1512 | |
1513 // Update the live region bitmap. | |
1514 if (marked_bytes > 0) { | |
829 | 1515 set_bit_for_region(hr); |
342 | 1516 } |
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1517 |
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1518 // Set the marked bytes for the current region so that |
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1519 // it can be queried by a calling verificiation routine |
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1520 _region_marked_bytes = marked_bytes; |
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1521 |
342 | 1522 return false; |
1523 } | |
1524 | |
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1525 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1526 }; |
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1527 |
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1528 // Heap region closure used for verifying the counting data |
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1529 // that was accumulated concurrently and aggregated during |
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1530 // the remark pause. This closure is applied to the heap |
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1531 // regions during the STW cleanup pause. |
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1532 |
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1533 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1534 G1CollectedHeap* _g1h; |
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1535 ConcurrentMark* _cm; |
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1536 CalcLiveObjectsClosure _calc_cl; |
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1537 BitMap* _region_bm; // Region BM to be verified |
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1538 BitMap* _card_bm; // Card BM to be verified |
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1539 bool _verbose; // verbose output? |
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1540 |
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1541 BitMap* _exp_region_bm; // Expected Region BM values |
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1542 BitMap* _exp_card_bm; // Expected card BM values |
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1543 |
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1544 int _failures; |
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1545 |
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1546 public: |
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1547 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1548 BitMap* region_bm, |
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1549 BitMap* card_bm, |
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1550 BitMap* exp_region_bm, |
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1551 BitMap* exp_card_bm, |
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1552 bool verbose) : |
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1553 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1554 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
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1555 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1556 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1557 _failures(0) { } |
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1558 |
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1559 int failures() const { return _failures; } |
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1560 |
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1561 bool doHeapRegion(HeapRegion* hr) { |
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1562 if (hr->continuesHumongous()) { |
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1563 // We will ignore these here and process them when their |
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1564 // associated "starts humongous" region is processed (see |
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1565 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1566 // associated "starts humongous" region to have their bit set to |
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1567 // 1 since, due to the region chunking in the parallel region |
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1568 // iteration, a "continues humongous" region might be visited |
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1569 // before its associated "starts humongous". |
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1570 return false; |
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|
1571 } |
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|
1572 |
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1573 int failures = 0; |
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|
1574 |
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1575 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1576 // this region and set the corresponding bits in the expected region |
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1577 // and card bitmaps. |
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1578 bool res = _calc_cl.doHeapRegion(hr); |
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1579 assert(res == false, "should be continuing"); |
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1580 |
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1581 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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|
1582 Mutex::_no_safepoint_check_flag); |
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1583 |
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1584 // Verify the marked bytes for this region. |
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1585 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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1586 size_t act_marked_bytes = hr->next_marked_bytes(); |
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|
1587 |
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1588 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1589 // we have missed accounting some objects during the actual marking. |
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1590 if (exp_marked_bytes > act_marked_bytes) { |
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|
1591 if (_verbose) { |
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|
1592 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
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1593 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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1594 hr->hrm_index(), exp_marked_bytes, act_marked_bytes); |
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1595 } |
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|
1596 failures += 1; |
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|
1597 } |
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|
1598 |
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1599 // Verify the bit, for this region, in the actual and expected |
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1600 // (which was just calculated) region bit maps. |
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1601 // We're not OK if the bit in the calculated expected region |
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1602 // bitmap is set and the bit in the actual region bitmap is not. |
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1603 BitMap::idx_t index = (BitMap::idx_t) hr->hrm_index(); |
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1604 |
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1605 bool expected = _exp_region_bm->at(index); |
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1606 bool actual = _region_bm->at(index); |
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1607 if (expected && !actual) { |
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1608 if (_verbose) { |
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1609 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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1610 "expected: %s, actual: %s", |
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1611 hr->hrm_index(), |
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1612 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1613 } |
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|
1614 failures += 1; |
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|
1615 } |
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|
1616 |
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1617 // Verify that the card bit maps for the cards spanned by the current |
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1618 // region match. We have an error if we have a set bit in the expected |
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1619 // bit map and the corresponding bit in the actual bitmap is not set. |
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1620 |
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1621 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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1622 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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1623 |
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1624 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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1625 expected = _exp_card_bm->at(i); |
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1626 actual = _card_bm->at(i); |
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|
1627 |
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1628 if (expected && !actual) { |
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1629 if (_verbose) { |
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1630 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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1631 "expected: %s, actual: %s", |
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8054819: Rename HeapRegionSeq to HeapRegionManager
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|
1632 hr->hrm_index(), i, |
6010
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1633 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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1634 } |
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|
1635 failures += 1; |
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|
1636 } |
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|
1637 } |
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|
1638 |
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1639 if (failures > 0 && _verbose) { |
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1640 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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1641 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
1642 HR_FORMAT_PARAMS(hr), p2i(hr->next_top_at_mark_start()), |
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1643 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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1644 } |
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|
1645 |
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1646 _failures += failures; |
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|
1647 |
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1648 // We could stop iteration over the heap when we |
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1649 // find the first violating region by returning true. |
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1650 return false; |
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1651 } |
342 | 1652 }; |
1653 | |
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1654 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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1655 protected: |
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1656 G1CollectedHeap* _g1h; |
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1657 ConcurrentMark* _cm; |
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1658 BitMap* _actual_region_bm; |
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1659 BitMap* _actual_card_bm; |
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1660 |
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1661 uint _n_workers; |
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|
1662 |
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1663 BitMap* _expected_region_bm; |
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1664 BitMap* _expected_card_bm; |
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|
1665 |
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1666 int _failures; |
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|
1667 bool _verbose; |
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|
1668 |
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|
1669 public: |
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1670 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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1671 BitMap* region_bm, BitMap* card_bm, |
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1672 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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1673 : AbstractGangTask("G1 verify final counting"), |
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1674 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1675 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1676 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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1677 _failures(0), _verbose(false), |
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|
1678 _n_workers(0) { |
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1679 assert(VerifyDuringGC, "don't call this otherwise"); |
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|
1680 |
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1681 // Use the value already set as the number of active threads |
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|
1682 // in the call to run_task(). |
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|
1683 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1684 assert( _g1h->workers()->active_workers() > 0, |
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|
1685 "Should have been previously set"); |
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|
1686 _n_workers = _g1h->workers()->active_workers(); |
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|
1687 } else { |
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|
1688 _n_workers = 1; |
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|
1689 } |
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|
1690 |
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|
1691 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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|
1692 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1693 |
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|
1694 _verbose = _cm->verbose_medium(); |
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|
1695 } |
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|
1696 |
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|
1697 void work(uint worker_id) { |
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|
1698 assert(worker_id < _n_workers, "invariant"); |
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|
1699 |
6812
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|
1700 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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|
1701 _actual_region_bm, _actual_card_bm, |
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|
1702 _expected_region_bm, |
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|
1703 _expected_card_bm, |
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|
1704 _verbose); |
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|
1705 |
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|
1706 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1707 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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|
1708 worker_id, |
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|
1709 _n_workers, |
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|
1710 HeapRegion::VerifyCountClaimValue); |
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|
1711 } else { |
d30fa85f9994
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|
1712 _g1h->heap_region_iterate(&verify_cl); |
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|
1713 } |
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|
1714 |
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|
1715 Atomic::add(verify_cl.failures(), &_failures); |
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|
1716 } |
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|
1717 |
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|
1718 int failures() const { return _failures; } |
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|
1719 }; |
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|
1720 |
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|
1721 // Closure that finalizes the liveness counting data. |
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|
1722 // Used during the cleanup pause. |
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|
1723 // Sets the bits corresponding to the interval [NTAMS, top] |
8a2e5a6a19a4
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|
1724 // (which contains the implicitly live objects) in the |
8a2e5a6a19a4
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|
1725 // card liveness bitmap. Also sets the bit for each region, |
8a2e5a6a19a4
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|
1726 // containing live data, in the region liveness bitmap. |
8a2e5a6a19a4
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|
1727 |
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|
1728 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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|
1729 public: |
6812
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|
1730 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
4836
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|
1731 BitMap* region_bm, |
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|
1732 BitMap* card_bm) : |
6812
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|
1733 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
4836
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|
1734 |
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|
1735 bool doHeapRegion(HeapRegion* hr) { |
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|
1736 |
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|
1737 if (hr->continuesHumongous()) { |
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|
1738 // We will ignore these here and process them when their |
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|
1739 // associated "starts humongous" region is processed (see |
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|
1740 // set_bit_for_heap_region()). Note that we cannot rely on their |
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|
1741 // associated "starts humongous" region to have their bit set to |
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|
1742 // 1 since, due to the region chunking in the parallel region |
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|
1743 // iteration, a "continues humongous" region might be visited |
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|
1744 // before its associated "starts humongous". |
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|
1745 return false; |
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|
1746 } |
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|
1747 |
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|
1748 HeapWord* ntams = hr->next_top_at_mark_start(); |
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|
1749 HeapWord* top = hr->top(); |
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|
1750 |
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|
1751 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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|
1752 |
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|
1753 // Mark the allocated-since-marking portion... |
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|
1754 if (ntams < top) { |
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|
1755 // This definitely means the region has live objects. |
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|
1756 set_bit_for_region(hr); |
6812
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1757 |
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|
1758 // Now set the bits in the card bitmap for [ntams, top) |
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1759 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1760 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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|
1761 |
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|
1762 // Note: if we're looking at the last region in heap - top |
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1763 // could be actually just beyond the end of the heap; end_idx |
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1764 // will then correspond to a (non-existent) card that is also |
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|
1765 // just beyond the heap. |
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|
1766 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1767 // end of object is not card aligned - increment to cover |
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|
1768 // all the cards spanned by the object |
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|
1769 end_idx += 1; |
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|
1770 } |
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|
1771 |
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|
1772 assert(end_idx <= _card_bm->size(), |
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|
1773 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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1774 end_idx, _card_bm->size())); |
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|
1775 assert(start_idx < _card_bm->size(), |
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|
1776 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1777 start_idx, _card_bm->size())); |
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1778 |
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1779 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
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1780 } |
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1781 |
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1782 // Set the bit for the region if it contains live data |
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1783 if (hr->next_marked_bytes() > 0) { |
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1784 set_bit_for_region(hr); |
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1785 } |
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|
1786 |
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|
1787 return false; |
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|
1788 } |
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|
1789 }; |
342 | 1790 |
1791 class G1ParFinalCountTask: public AbstractGangTask { | |
1792 protected: | |
1793 G1CollectedHeap* _g1h; | |
4836
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1794 ConcurrentMark* _cm; |
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1795 BitMap* _actual_region_bm; |
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1796 BitMap* _actual_card_bm; |
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1797 |
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1798 uint _n_workers; |
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1799 |
342 | 1800 public: |
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1801 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1802 : AbstractGangTask("G1 final counting"), |
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1803 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1804 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1805 _n_workers(0) { |
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1806 // Use the value already set as the number of active threads |
6011 | 1807 // in the call to run_task(). |
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1808 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1809 assert( _g1h->workers()->active_workers() > 0, |
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1810 "Should have been previously set"); |
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1811 _n_workers = _g1h->workers()->active_workers(); |
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1812 } else { |
342 | 1813 _n_workers = 1; |
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1814 } |
342 | 1815 } |
1816 | |
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1817 void work(uint worker_id) { |
4836
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1818 assert(worker_id < _n_workers, "invariant"); |
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1819 |
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1820 FinalCountDataUpdateClosure final_update_cl(_g1h, |
4836
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1821 _actual_region_bm, |
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1822 _actual_card_bm); |
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1823 |
1833
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1824 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1825 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1826 worker_id, |
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1827 _n_workers, |
355 | 1828 HeapRegion::FinalCountClaimValue); |
342 | 1829 } else { |
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1830 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1831 } |
1832 } | |
1833 }; | |
1834 | |
1835 class G1ParNoteEndTask; | |
1836 | |
1837 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1838 G1CollectedHeap* _g1; | |
1839 size_t _max_live_bytes; | |
6010
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1840 uint _regions_claimed; |
342 | 1841 size_t _freed_bytes; |
2173 | 1842 FreeRegionList* _local_cleanup_list; |
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1843 HeapRegionSetCount _old_regions_removed; |
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1844 HeapRegionSetCount _humongous_regions_removed; |
2173 | 1845 HRRSCleanupTask* _hrrs_cleanup_task; |
342 | 1846 double _claimed_region_time; |
1847 double _max_region_time; | |
1848 | |
1849 public: | |
1850 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1851 FreeRegionList* local_cleanup_list, |
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1852 HRRSCleanupTask* hrrs_cleanup_task) : |
17844
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1853 _g1(g1), |
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1854 _max_live_bytes(0), _regions_claimed(0), |
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1855 _freed_bytes(0), |
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1856 _claimed_region_time(0.0), _max_region_time(0.0), |
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1857 _local_cleanup_list(local_cleanup_list), |
17736
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1858 _old_regions_removed(), |
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1859 _humongous_regions_removed(), |
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1860 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1861 |
342 | 1862 size_t freed_bytes() { return _freed_bytes; } |
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1863 const HeapRegionSetCount& old_regions_removed() { return _old_regions_removed; } |
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1864 const HeapRegionSetCount& humongous_regions_removed() { return _humongous_regions_removed; } |
342 | 1865 |
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1866 bool doHeapRegion(HeapRegion *hr) { |
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1867 if (hr->continuesHumongous()) { |
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1868 return false; |
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1869 } |
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1870 // We use a claim value of zero here because all regions |
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1871 // were claimed with value 1 in the FinalCount task. |
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1872 _g1->reset_gc_time_stamps(hr); |
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1873 double start = os::elapsedTime(); |
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1874 _regions_claimed++; |
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1875 hr->note_end_of_marking(); |
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1876 _max_live_bytes += hr->max_live_bytes(); |
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1877 |
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1878 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { |
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1879 _freed_bytes += hr->used(); |
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1880 hr->set_containing_set(NULL); |
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1881 if (hr->isHumongous()) { |
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1882 assert(hr->startsHumongous(), "we should only see starts humongous"); |
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1883 _humongous_regions_removed.increment(1u, hr->capacity()); |
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1884 _g1->free_humongous_region(hr, _local_cleanup_list, true); |
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1885 } else { |
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1886 _old_regions_removed.increment(1u, hr->capacity()); |
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1887 _g1->free_region(hr, _local_cleanup_list, true); |
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1888 } |
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1889 } else { |
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1890 hr->rem_set()->do_cleanup_work(_hrrs_cleanup_task); |
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1891 } |
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1892 |
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1893 double region_time = (os::elapsedTime() - start); |
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1894 _claimed_region_time += region_time; |
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1895 if (region_time > _max_region_time) { |
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1896 _max_region_time = region_time; |
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1897 } |
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1898 return false; |
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1899 } |
342 | 1900 |
1901 size_t max_live_bytes() { return _max_live_bytes; } | |
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1902 uint regions_claimed() { return _regions_claimed; } |
342 | 1903 double claimed_region_time_sec() { return _claimed_region_time; } |
1904 double max_region_time_sec() { return _max_region_time; } | |
1905 }; | |
1906 | |
1907 class G1ParNoteEndTask: public AbstractGangTask { | |
1908 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1909 |
342 | 1910 protected: |
1911 G1CollectedHeap* _g1h; | |
1912 size_t _max_live_bytes; | |
1913 size_t _freed_bytes; | |
2152 | 1914 FreeRegionList* _cleanup_list; |
1915 | |
342 | 1916 public: |
1917 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1918 FreeRegionList* cleanup_list) : |
342 | 1919 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1920 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1921 |
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1922 void work(uint worker_id) { |
342 | 1923 double start = os::elapsedTime(); |
2173 | 1924 FreeRegionList local_cleanup_list("Local Cleanup List"); |
1925 HRRSCleanupTask hrrs_cleanup_task; | |
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1926 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, &local_cleanup_list, |
2173 | 1927 &hrrs_cleanup_task); |
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1928 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1929 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1930 _g1h->workers()->active_workers(), |
355 | 1931 HeapRegion::NoteEndClaimValue); |
342 | 1932 } else { |
1933 _g1h->heap_region_iterate(&g1_note_end); | |
1934 } | |
1935 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1936 | |
2152 | 1937 // Now update the lists |
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1938 _g1h->remove_from_old_sets(g1_note_end.old_regions_removed(), g1_note_end.humongous_regions_removed()); |
342 | 1939 { |
1940 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
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1941 _g1h->decrement_summary_bytes(g1_note_end.freed_bytes()); |
342 | 1942 _max_live_bytes += g1_note_end.max_live_bytes(); |
1943 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1944 |
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1945 // If we iterate over the global cleanup list at the end of |
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1946 // cleanup to do this printing we will not guarantee to only |
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1947 // generate output for the newly-reclaimed regions (the list |
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1948 // might not be empty at the beginning of cleanup; we might |
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1949 // still be working on its previous contents). So we do the |
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1950 // printing here, before we append the new regions to the global |
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1951 // cleanup list. |
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1952 |
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1953 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1954 if (hr_printer->is_active()) { |
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1955 FreeRegionListIterator iter(&local_cleanup_list); |
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1956 while (iter.more_available()) { |
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1957 HeapRegion* hr = iter.get_next(); |
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1958 hr_printer->cleanup(hr); |
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1959 } |
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1960 } |
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1961 |
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1962 _cleanup_list->add_ordered(&local_cleanup_list); |
2173 | 1963 assert(local_cleanup_list.is_empty(), "post-condition"); |
1964 | |
1965 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1966 } |
1967 } | |
1968 size_t max_live_bytes() { return _max_live_bytes; } | |
1969 size_t freed_bytes() { return _freed_bytes; } | |
1970 }; | |
1971 | |
1972 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1973 protected: | |
1974 G1RemSet* _g1rs; | |
1975 BitMap* _region_bm; | |
1976 BitMap* _card_bm; | |
1977 public: | |
1978 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1979 BitMap* region_bm, BitMap* card_bm) : | |
1980 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1981 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1982 |
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1983 void work(uint worker_id) { |
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1984 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1985 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1986 HeapRegion::ScrubRemSetClaimValue); |
342 | 1987 } else { |
1988 _g1rs->scrub(_region_bm, _card_bm); | |
1989 } | |
1990 } | |
1991 | |
1992 }; | |
1993 | |
1994 void ConcurrentMark::cleanup() { | |
1995 // world is stopped at this checkpoint | |
1996 assert(SafepointSynchronize::is_at_safepoint(), | |
1997 "world should be stopped"); | |
1998 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1999 | |
2000 // If a full collection has happened, we shouldn't do this. | |
2001 if (has_aborted()) { | |
2002 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
2003 return; | |
2004 } | |
2005 | |
2152 | 2006 g1h->verify_region_sets_optional(); |
2007 | |
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2008 if (VerifyDuringGC) { |
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2009 HandleMark hm; // handle scope |
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2010 Universe::heap()->prepare_for_verify(); |
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2011 Universe::verify(VerifyOption_G1UsePrevMarking, |
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2012 " VerifyDuringGC:(before)"); |
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2013 } |
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2014 g1h->check_bitmaps("Cleanup Start"); |
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2015 |
342 | 2016 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
2017 g1p->record_concurrent_mark_cleanup_start(); | |
2018 | |
2019 double start = os::elapsedTime(); | |
2020 | |
2173 | 2021 HeapRegionRemSet::reset_for_cleanup_tasks(); |
2022 | |
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2023 uint n_workers; |
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2024 |
342 | 2025 // Do counting once more with the world stopped for good measure. |
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2026 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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2027 |
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2028 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2029 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 2030 "sanity check"); |
2031 | |
4711 | 2032 g1h->set_par_threads(); |
2033 n_workers = g1h->n_par_threads(); | |
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2034 assert(g1h->n_par_threads() == n_workers, |
4711 | 2035 "Should not have been reset"); |
342 | 2036 g1h->workers()->run_task(&g1_par_count_task); |
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2037 // Done with the parallel phase so reset to 0. |
342 | 2038 g1h->set_par_threads(0); |
355 | 2039 |
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2040 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 2041 "sanity check"); |
342 | 2042 } else { |
4711 | 2043 n_workers = 1; |
342 | 2044 g1_par_count_task.work(0); |
2045 } | |
2046 | |
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2047 if (VerifyDuringGC) { |
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2048 // Verify that the counting data accumulated during marking matches |
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2049 // that calculated by walking the marking bitmap. |
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2050 |
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2051 // Bitmaps to hold expected values |
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2052 BitMap expected_region_bm(_region_bm.size(), true); |
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2053 BitMap expected_card_bm(_card_bm.size(), true); |
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2054 |
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2055 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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2056 &_region_bm, |
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2057 &_card_bm, |
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2058 &expected_region_bm, |
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2059 &expected_card_bm); |
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2060 |
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2061 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2062 g1h->set_par_threads((int)n_workers); |
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2063 g1h->workers()->run_task(&g1_par_verify_task); |
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2064 // Done with the parallel phase so reset to 0. |
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2065 g1h->set_par_threads(0); |
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2066 |
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2067 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2068 "sanity check"); |
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2069 } else { |
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2070 g1_par_verify_task.work(0); |
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2071 } |
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2072 |
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2073 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2074 } |
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2075 |
342 | 2076 size_t start_used_bytes = g1h->used(); |
2077 g1h->set_marking_complete(); | |
2078 | |
2079 double count_end = os::elapsedTime(); | |
2080 double this_final_counting_time = (count_end - start); | |
2081 _total_counting_time += this_final_counting_time; | |
2082 | |
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2083 if (G1PrintRegionLivenessInfo) { |
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2084 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2085 _g1h->heap_region_iterate(&cl); |
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2086 } |
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2087 |
342 | 2088 // Install newly created mark bitMap as "prev". |
2089 swapMarkBitMaps(); | |
2090 | |
2091 g1h->reset_gc_time_stamp(); | |
2092 | |
2093 // Note end of marking in all heap regions. | |
2152 | 2094 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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2095 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2096 g1h->set_par_threads((int)n_workers); |
342 | 2097 g1h->workers()->run_task(&g1_par_note_end_task); |
2098 g1h->set_par_threads(0); | |
355 | 2099 |
2100 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2101 "sanity check"); | |
342 | 2102 } else { |
2103 g1_par_note_end_task.work(0); | |
2104 } | |
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2105 g1h->check_gc_time_stamps(); |
2152 | 2106 |
2107 if (!cleanup_list_is_empty()) { | |
2108 // The cleanup list is not empty, so we'll have to process it | |
2109 // concurrently. Notify anyone else that might be wanting free | |
2110 // regions that there will be more free regions coming soon. | |
2111 g1h->set_free_regions_coming(); | |
2112 } | |
342 | 2113 |
2114 // call below, since it affects the metric by which we sort the heap | |
2115 // regions. | |
2116 if (G1ScrubRemSets) { | |
2117 double rs_scrub_start = os::elapsedTime(); | |
2118 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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2119 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2120 g1h->set_par_threads((int)n_workers); |
342 | 2121 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2122 g1h->set_par_threads(0); | |
355 | 2123 |
2124 assert(g1h->check_heap_region_claim_values( | |
2125 HeapRegion::ScrubRemSetClaimValue), | |
2126 "sanity check"); | |
342 | 2127 } else { |
2128 g1_par_scrub_rs_task.work(0); | |
2129 } | |
2130 | |
2131 double rs_scrub_end = os::elapsedTime(); | |
2132 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2133 _total_rs_scrub_time += this_rs_scrub_time; | |
2134 } | |
2135 | |
2136 // this will also free any regions totally full of garbage objects, | |
2137 // and sort the regions. | |
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2138 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2139 |
2140 // Statistics. | |
2141 double end = os::elapsedTime(); | |
2142 _cleanup_times.add((end - start) * 1000.0); | |
2143 | |
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5988
diff
changeset
|
2144 if (G1Log::fine()) { |
342 | 2145 g1h->print_size_transition(gclog_or_tty, |
2146 start_used_bytes, | |
2147 g1h->used(), | |
2148 g1h->capacity()); | |
2149 } | |
2150 | |
3979
4dfb2df418f2
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|
2151 // Clean up will have freed any regions completely full of garbage. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2152 // Update the soft reference policy with the new heap occupancy. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2153 Universe::update_heap_info_at_gc(); |
4dfb2df418f2
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|
2154 |
751 | 2155 if (VerifyDuringGC) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2156 HandleMark hm; // handle scope |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2157 Universe::heap()->prepare_for_verify(); |
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
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|
2158 Universe::verify(VerifyOption_G1UsePrevMarking, |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
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|
2159 " VerifyDuringGC:(after)"); |
342 | 2160 } |
20291
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
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20282
diff
changeset
|
2161 g1h->check_bitmaps("Cleanup End"); |
2152 | 2162 |
2163 g1h->verify_region_sets_optional(); | |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2164 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2165 // We need to make this be a "collection" so any collection pause that |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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20263
diff
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|
2166 // races with it goes around and waits for completeCleanup to finish. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2167 g1h->increment_total_collections(); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2168 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2169 // Clean out dead classes and update Metaspace sizes. |
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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20278
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|
2170 if (ClassUnloadingWithConcurrentMark) { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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20278
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|
2171 ClassLoaderDataGraph::purge(); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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20278
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|
2172 } |
20278
2c6ef90f030a
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|
2173 MetaspaceGC::compute_new_size(); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2174 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2175 // We reclaimed old regions so we should calculate the sizes to make |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2176 // sure we update the old gen/space data. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2177 g1h->g1mm()->update_sizes(); |
20656
8d27d6113625
8065227: Report allocation context stats at end of cleanup
sjohanss
parents:
20619
diff
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|
2178 g1h->allocation_context_stats().update_after_mark(); |
20278
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|
2179 |
10405 | 2180 g1h->trace_heap_after_concurrent_cycle(); |
342 | 2181 } |
2182 | |
2183 void ConcurrentMark::completeCleanup() { | |
2184 if (has_aborted()) return; | |
2185 | |
2152 | 2186 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2187 | |
17841
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8039089: List verification enabled in product builds
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|
2188 _cleanup_list.verify_optional(); |
2361 | 2189 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2190 |
2191 if (G1ConcRegionFreeingVerbose) { | |
2192 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
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|
2193 "cleanup list has %u entries", |
2152 | 2194 _cleanup_list.length()); |
2195 } | |
2196 | |
20337 | 2197 // No one else should be accessing the _cleanup_list at this point, |
2198 // so it is not necessary to take any locks | |
2152 | 2199 while (!_cleanup_list.is_empty()) { |
20336
6701abbc4441
8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents:
20335
diff
changeset
|
2200 HeapRegion* hr = _cleanup_list.remove_region(true /* from_head */); |
17773
8ee855b4e667
8036025: Sort the freelist in order to shrink the heap
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17750
diff
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|
2201 assert(hr != NULL, "Got NULL from a non-empty list"); |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3316
diff
changeset
|
2202 hr->par_clear(); |
17773
8ee855b4e667
8036025: Sort the freelist in order to shrink the heap
jwilhelm
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17750
diff
changeset
|
2203 tmp_free_list.add_ordered(hr); |
2152 | 2204 |
2205 // Instead of adding one region at a time to the secondary_free_list, | |
2206 // we accumulate them in the local list and move them a few at a | |
2207 // time. This also cuts down on the number of notify_all() calls | |
2208 // we do during this process. We'll also append the local list when | |
2209 // _cleanup_list is empty (which means we just removed the last | |
2210 // region from the _cleanup_list). | |
2361 | 2211 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2212 _cleanup_list.is_empty()) { |
2213 if (G1ConcRegionFreeingVerbose) { | |
2214 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
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|
2215 "appending %u entries to the secondary_free_list, " |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
diff
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|
2216 "cleanup list still has %u entries", |
2361 | 2217 tmp_free_list.length(), |
2152 | 2218 _cleanup_list.length()); |
342 | 2219 } |
2152 | 2220 |
2221 { | |
2222 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
17773
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jwilhelm
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17750
diff
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|
2223 g1h->secondary_free_list_add(&tmp_free_list); |
2152 | 2224 SecondaryFreeList_lock->notify_all(); |
2225 } | |
2226 | |
2227 if (G1StressConcRegionFreeing) { | |
2228 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2229 os::sleep(Thread::current(), (jlong) 1, false); | |
2230 } | |
2231 } | |
342 | 2232 } |
2233 } | |
2361 | 2234 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2235 } |
2236 | |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
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|
2237 // Supporting Object and Oop closures for reference discovery |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
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|
2238 // and processing in during marking |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2239 |
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
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1974
diff
changeset
|
2240 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2241 HeapWord* addr = (HeapWord*)obj; |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2242 return addr != NULL && |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2243 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
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|
2244 } |
342 | 2245 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
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|
2246 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
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|
2247 // Uses the CMTask associated with a worker thread (for serial reference |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2248 // processing the CMTask for worker 0 is used) to preserve (mark) and |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2249 // trace referent objects. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2250 // |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2251 // Using the CMTask and embedded local queues avoids having the worker |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2252 // threads operating on the global mark stack. This reduces the risk |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2253 // of overflowing the stack - which we would rather avoid at this late |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2254 // state. Also using the tasks' local queues removes the potential |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2255 // of the workers interfering with each other that could occur if |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2256 // operating on the global stack. |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2257 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2258 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2259 ConcurrentMark* _cm; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2260 CMTask* _task; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2261 int _ref_counter_limit; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2262 int _ref_counter; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2263 bool _is_serial; |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2264 public: |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2265 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2266 _cm(cm), _task(task), _is_serial(is_serial), |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2267 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2268 assert(_ref_counter_limit > 0, "sanity"); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
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|
2269 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2270 _ref_counter = _ref_counter_limit; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2271 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2272 |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2273 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2274 virtual void do_oop( oop* p) { do_oop_work(p); } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2275 |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2276 template <class T> void do_oop_work(T* p) { |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2277 if (!_cm->has_overflown()) { |
234761c55641
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johnc
parents:
2152
diff
changeset
|
2278 oop obj = oopDesc::load_decode_heap_oop(p); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
2279 if (_cm->verbose_high()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2280 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2281 "*"PTR_FORMAT" = "PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
2282 _task->worker_id(), p2i(p), p2i((void*) obj)); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
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|
2283 } |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2284 |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2285 _task->deal_with_reference(obj); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2286 _ref_counter--; |
234761c55641
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parents:
2152
diff
changeset
|
2287 |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2288 if (_ref_counter == 0) { |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2289 // We have dealt with _ref_counter_limit references, pushing them |
f90b9bceb8e5
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johnc
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8008
diff
changeset
|
2290 // and objects reachable from them on to the local stack (and |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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8008
diff
changeset
|
2291 // possibly the global stack). Call CMTask::do_marking_step() to |
f90b9bceb8e5
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8008
diff
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|
2292 // process these entries. |
f90b9bceb8e5
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8008
diff
changeset
|
2293 // |
f90b9bceb8e5
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8008
diff
changeset
|
2294 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2295 // there's nothing more to do (i.e. we're done with the entries that |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2296 // were pushed as a result of the CMTask::deal_with_reference() calls |
f90b9bceb8e5
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8008
diff
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|
2297 // above) or we overflow. |
f90b9bceb8e5
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8008
diff
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|
2298 // |
f90b9bceb8e5
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8008
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changeset
|
2299 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
f90b9bceb8e5
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johnc
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diff
changeset
|
2300 // flag while there may still be some work to do. (See the comment at |
f90b9bceb8e5
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8008
diff
changeset
|
2301 // the beginning of CMTask::do_marking_step() for those conditions - |
f90b9bceb8e5
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8008
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|
2302 // one of which is reaching the specified time target.) It is only |
f90b9bceb8e5
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8008
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|
2303 // when CMTask::do_marking_step() returns without setting the |
f90b9bceb8e5
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8008
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changeset
|
2304 // has_aborted() flag that the marking step has completed. |
2174
234761c55641
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2152
diff
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|
2305 do { |
234761c55641
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2152
diff
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|
2306 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
234761c55641
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2152
diff
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|
2307 _task->do_marking_step(mark_step_duration_ms, |
8787
fa08949fe0cb
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8744
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|
2308 false /* do_termination */, |
fa08949fe0cb
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8744
diff
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|
2309 _is_serial); |
2174
234761c55641
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2152
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|
2310 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2311 _ref_counter = _ref_counter_limit; |
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2312 } |
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2313 } else { |
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2314 if (_cm->verbose_high()) { |
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2315 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
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2316 } |
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2317 } |
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2318 } |
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2319 }; |
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2320 |
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2321 // 'Drain' oop closure used by both serial and parallel reference processing. |
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2322 // Uses the CMTask associated with a given worker thread (for serial |
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2323 // reference processing the CMtask for worker 0 is used). Calls the |
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2324 // do_marking_step routine, with an unbelievably large timeout value, |
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2325 // to drain the marking data structures of the remaining entries |
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2326 // added by the 'keep alive' oop closure above. |
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2327 |
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2328 class G1CMDrainMarkingStackClosure: public VoidClosure { |
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2329 ConcurrentMark* _cm; |
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2330 CMTask* _task; |
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2331 bool _is_serial; |
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2332 public: |
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2333 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2334 _cm(cm), _task(task), _is_serial(is_serial) { |
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2335 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
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2336 } |
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2337 |
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2338 void do_void() { |
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2339 do { |
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2340 if (_cm->verbose_high()) { |
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2341 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
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2342 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
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2343 } |
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2344 |
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2345 // We call CMTask::do_marking_step() to completely drain the local |
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2346 // and global marking stacks of entries pushed by the 'keep alive' |
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2347 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
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2348 // |
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2349 // CMTask::do_marking_step() is called in a loop, which we'll exit |
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2350 // if there's nothing more to do (i.e. we'completely drained the |
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2351 // entries that were pushed as a a result of applying the 'keep alive' |
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2352 // closure to the entries on the discovered ref lists) or we overflow |
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2353 // the global marking stack. |
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|
2354 // |
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2355 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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2356 // flag while there may still be some work to do. (See the comment at |
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2357 // the beginning of CMTask::do_marking_step() for those conditions - |
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2358 // one of which is reaching the specified time target.) It is only |
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2359 // when CMTask::do_marking_step() returns without setting the |
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2360 // has_aborted() flag that the marking step has completed. |
2174
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2361 |
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|
2362 _task->do_marking_step(1000000000.0 /* something very large */, |
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|
2363 true /* do_termination */, |
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|
2364 _is_serial); |
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2365 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2366 } |
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|
2367 }; |
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|
2368 |
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2369 // Implementation of AbstractRefProcTaskExecutor for parallel |
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|
2370 // reference processing at the end of G1 concurrent marking |
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|
2371 |
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|
2372 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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|
2373 private: |
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|
2374 G1CollectedHeap* _g1h; |
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|
2375 ConcurrentMark* _cm; |
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|
2376 WorkGang* _workers; |
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|
2377 int _active_workers; |
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|
2378 |
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|
2379 public: |
3979
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|
2380 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
2174
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|
2381 ConcurrentMark* cm, |
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|
2382 WorkGang* workers, |
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|
2383 int n_workers) : |
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2384 _g1h(g1h), _cm(cm), |
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|
2385 _workers(workers), _active_workers(n_workers) { } |
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|
2386 |
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|
2387 // Executes the given task using concurrent marking worker threads. |
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|
2388 virtual void execute(ProcessTask& task); |
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|
2389 virtual void execute(EnqueueTask& task); |
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|
2390 }; |
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|
2391 |
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|
2392 class G1CMRefProcTaskProxy: public AbstractGangTask { |
2174
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|
2393 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
2394 ProcessTask& _proc_task; |
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|
2395 G1CollectedHeap* _g1h; |
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|
2396 ConcurrentMark* _cm; |
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|
2397 |
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|
2398 public: |
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|
2399 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
2174
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|
2400 G1CollectedHeap* g1h, |
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|
2401 ConcurrentMark* cm) : |
2174
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|
2402 AbstractGangTask("Process reference objects in parallel"), |
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|
2403 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
8787
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|
2404 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
2405 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
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|
2406 } |
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|
2407 |
4728
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|
2408 virtual void work(uint worker_id) { |
20306
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|
2409 ResourceMark rm; |
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|
2410 HandleMark hm; |
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|
2411 CMTask* task = _cm->task(worker_id); |
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2412 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2413 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
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|
2414 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
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|
2415 |
4728
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|
2416 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2417 } |
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|
2418 }; |
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|
2419 |
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|
2420 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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|
2421 assert(_workers != NULL, "Need parallel worker threads."); |
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|
2422 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2423 |
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2424 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
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2425 |
8788
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|
2426 // We need to reset the concurrency level before each |
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|
2427 // proxy task execution, so that the termination protocol |
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|
2428 // and overflow handling in CMTask::do_marking_step() knows |
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|
2429 // how many workers to wait for. |
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|
2430 _cm->set_concurrency(_active_workers); |
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|
2431 _g1h->set_par_threads(_active_workers); |
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|
2432 _workers->run_task(&proc_task_proxy); |
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|
2433 _g1h->set_par_threads(0); |
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|
2434 } |
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|
2435 |
3979
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2436 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
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|
2437 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
2438 EnqueueTask& _enq_task; |
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|
2439 |
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|
2440 public: |
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|
2441 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
2174
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2442 AbstractGangTask("Enqueue reference objects in parallel"), |
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|
2443 _enq_task(enq_task) { } |
2174
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|
2444 |
4728
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|
2445 virtual void work(uint worker_id) { |
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|
2446 _enq_task.work(worker_id); |
2174
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|
2447 } |
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|
2448 }; |
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|
2449 |
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|
2450 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
2174
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|
2451 assert(_workers != NULL, "Need parallel worker threads."); |
8014
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|
2452 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
2174
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|
2453 |
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|
2454 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
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2455 |
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|
2456 // Not strictly necessary but... |
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|
2457 // |
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|
2458 // We need to reset the concurrency level before each |
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2459 // proxy task execution, so that the termination protocol |
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|
2460 // and overflow handling in CMTask::do_marking_step() knows |
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|
2461 // how many workers to wait for. |
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|
2462 _cm->set_concurrency(_active_workers); |
2174
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|
2463 _g1h->set_par_threads(_active_workers); |
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|
2464 _workers->run_task(&enq_task_proxy); |
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diff
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|
2465 _g1h->set_par_threads(0); |
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|
2466 } |
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|
2467 |
20278
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|
2468 void ConcurrentMark::weakRefsWorkParallelPart(BoolObjectClosure* is_alive, bool purged_classes) { |
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|
2469 G1CollectedHeap::heap()->parallel_cleaning(is_alive, true, true, purged_classes); |
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|
2470 } |
2c6ef90f030a
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parents:
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diff
changeset
|
2471 |
2c6ef90f030a
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diff
changeset
|
2472 // Helper class to get rid of some boilerplate code. |
2c6ef90f030a
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diff
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|
2473 class G1RemarkGCTraceTime : public GCTraceTime { |
2c6ef90f030a
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|
2474 static bool doit_and_prepend(bool doit) { |
2c6ef90f030a
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stefank
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diff
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|
2475 if (doit) { |
2c6ef90f030a
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diff
changeset
|
2476 gclog_or_tty->put(' '); |
2c6ef90f030a
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stefank
parents:
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diff
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|
2477 } |
2c6ef90f030a
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stefank
parents:
20263
diff
changeset
|
2478 return doit; |
2c6ef90f030a
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parents:
20263
diff
changeset
|
2479 } |
2c6ef90f030a
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stefank
parents:
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diff
changeset
|
2480 |
2c6ef90f030a
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diff
changeset
|
2481 public: |
2c6ef90f030a
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stefank
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20263
diff
changeset
|
2482 G1RemarkGCTraceTime(const char* title, bool doit) |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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parents:
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diff
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|
2483 : GCTraceTime(title, doit_and_prepend(doit), false, G1CollectedHeap::heap()->gc_timer_cm(), |
2c6ef90f030a
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diff
changeset
|
2484 G1CollectedHeap::heap()->concurrent_mark()->concurrent_gc_id()) { |
2c6ef90f030a
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parents:
20263
diff
changeset
|
2485 } |
2c6ef90f030a
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diff
changeset
|
2486 }; |
2c6ef90f030a
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diff
changeset
|
2487 |
342 | 2488 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
8788
e864cc14ca75
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parents:
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diff
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|
2489 if (has_overflown()) { |
e864cc14ca75
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diff
changeset
|
2490 // Skip processing the discovered references if we have |
e864cc14ca75
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diff
changeset
|
2491 // overflown the global marking stack. Reference objects |
e864cc14ca75
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parents:
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diff
changeset
|
2492 // only get discovered once so it is OK to not |
e864cc14ca75
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parents:
8787
diff
changeset
|
2493 // de-populate the discovered reference lists. We could have, |
e864cc14ca75
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8787
diff
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|
2494 // but the only benefit would be that, when marking restarts, |
e864cc14ca75
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diff
changeset
|
2495 // less reference objects are discovered. |
e864cc14ca75
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8787
diff
changeset
|
2496 return; |
e864cc14ca75
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diff
changeset
|
2497 } |
e864cc14ca75
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diff
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|
2498 |
342 | 2499 ResourceMark rm; |
2500 HandleMark hm; | |
3975
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3914
diff
changeset
|
2501 |
1847b501ae74
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diff
changeset
|
2502 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1847b501ae74
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3914
diff
changeset
|
2503 |
1847b501ae74
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diff
changeset
|
2504 // Is alive closure. |
1847b501ae74
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diff
changeset
|
2505 G1CMIsAliveClosure g1_is_alive(g1h); |
1847b501ae74
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3914
diff
changeset
|
2506 |
1847b501ae74
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3914
diff
changeset
|
2507 // Inner scope to exclude the cleaning of the string and symbol |
1847b501ae74
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parents:
3914
diff
changeset
|
2508 // tables from the displayed time. |
1847b501ae74
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parents:
3914
diff
changeset
|
2509 { |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5988
diff
changeset
|
2510 if (G1Log::finer()) { |
3975
1847b501ae74
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parents:
3914
diff
changeset
|
2511 gclog_or_tty->put(' '); |
1847b501ae74
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parents:
3914
diff
changeset
|
2512 } |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2513 GCTraceTime t("GC ref-proc", G1Log::finer(), false, g1h->gc_timer_cm(), concurrent_gc_id()); |
3975
1847b501ae74
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|
2514 |
3979
4dfb2df418f2
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|
2515 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
3975
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diff
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|
2516 |
1847b501ae74
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diff
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|
2517 // See the comment in G1CollectedHeap::ref_processing_init() |
1847b501ae74
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parents:
3914
diff
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|
2518 // about how reference processing currently works in G1. |
1847b501ae74
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parents:
3914
diff
changeset
|
2519 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2520 // Set the soft reference policy |
3975
1847b501ae74
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diff
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|
2521 rp->setup_policy(clear_all_soft_refs); |
1847b501ae74
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parents:
3914
diff
changeset
|
2522 assert(_markStack.isEmpty(), "mark stack should be empty"); |
1847b501ae74
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parents:
3914
diff
changeset
|
2523 |
8787
fa08949fe0cb
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diff
changeset
|
2524 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
fa08949fe0cb
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johnc
parents:
8744
diff
changeset
|
2525 // in serial reference processing. Note these closures are also |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2526 // used for serially processing (by the the current thread) the |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2527 // JNI references during parallel reference processing. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2528 // |
fa08949fe0cb
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johnc
parents:
8744
diff
changeset
|
2529 // These closures do not need to synchronize with the worker |
fa08949fe0cb
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johnc
parents:
8744
diff
changeset
|
2530 // threads involved in parallel reference processing as these |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2531 // instances are executed serially by the current thread (e.g. |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2532 // reference processing is not multi-threaded and is thus |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2533 // performed by the current thread instead of a gang worker). |
fa08949fe0cb
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johnc
parents:
8744
diff
changeset
|
2534 // |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2535 // The gang tasks involved in parallel reference procssing create |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2536 // their own instances of these closures, which do their own |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2537 // synchronization among themselves. |
fa08949fe0cb
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8744
diff
changeset
|
2538 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2539 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), true /* is_serial */); |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2540 |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2541 // We need at least one active thread. If reference processing |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2542 // is not multi-threaded we use the current (VMThread) thread, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2543 // otherwise we use the work gang from the G1CollectedHeap and |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2544 // we utilize all the worker threads we can. |
fa08949fe0cb
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parents:
8744
diff
changeset
|
2545 bool processing_is_mt = rp->processing_is_mt() && g1h->workers() != NULL; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2546 uint active_workers = (processing_is_mt ? g1h->workers()->active_workers() : 1U); |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
2547 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
1847b501ae74
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|
2548 |
8787
fa08949fe0cb
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changeset
|
2549 // Parallel processing task executor. |
4093
6071e0581859
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parents:
4072
diff
changeset
|
2550 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
4dfb2df418f2
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3977
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changeset
|
2551 g1h->workers(), active_workers); |
8787
fa08949fe0cb
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parents:
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diff
changeset
|
2552 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
8014
f90b9bceb8e5
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|
2553 |
8788
e864cc14ca75
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changeset
|
2554 // Set the concurrency level. The phase was already set prior to |
e864cc14ca75
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8787
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changeset
|
2555 // executing the remark task. |
e864cc14ca75
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diff
changeset
|
2556 set_concurrency(active_workers); |
e864cc14ca75
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8787
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|
2557 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2558 // Set the degree of MT processing here. If the discovery was done MT, |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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parents:
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diff
changeset
|
2559 // the number of threads involved during discovery could differ from |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2560 // the number of active workers. This is OK as long as the discovered |
f90b9bceb8e5
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parents:
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diff
changeset
|
2561 // Reference lists are balanced (see balance_all_queues() and balance_queues()). |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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parents:
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diff
changeset
|
2562 rp->set_active_mt_degree(active_workers); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2563 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2564 // Process the weak references. |
10405 | 2565 const ReferenceProcessorStats& stats = |
2566 rp->process_discovered_references(&g1_is_alive, | |
2567 &g1_keep_alive, | |
2568 &g1_drain_mark_stack, | |
2569 executor, | |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2570 g1h->gc_timer_cm(), |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2571 concurrent_gc_id()); |
10405 | 2572 g1h->gc_tracer_cm()->report_gc_reference_stats(stats); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2573 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2574 // The do_oop work routines of the keep_alive and drain_marking_stack |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2575 // oop closures will set the has_overflown flag if we overflow the |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2576 // global marking stack. |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2577 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2578 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2579 "mark stack should be empty (unless it overflowed)"); |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2580 |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2581 if (_markStack.overflow()) { |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2582 // This should have been done already when we tried to push an |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2583 // entry on to the global mark stack. But let's do it again. |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2584 set_has_overflown(); |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2585 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2586 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2587 assert(rp->num_q() == active_workers, "why not"); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2588 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2589 rp->enqueue_discovered_references(executor); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2590 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2591 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2592 assert(!rp->discovery_enabled(), "Post condition"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2593 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2594 |
17750
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2595 if (has_overflown()) { |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2596 // We can not trust g1_is_alive if the marking stack overflowed |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2597 return; |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2598 } |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2599 |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2600 assert(_markStack.isEmpty(), "Marking should have completed"); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2601 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2602 // Unload Klasses, String, Symbols, Code Cache, etc. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2603 { |
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2604 G1RemarkGCTraceTime trace("Unloading", G1Log::finer()); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2605 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2606 if (ClassUnloadingWithConcurrentMark) { |
20619
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2607 // Cleaning of klasses depends on correct information from MetadataMarkOnStack. The CodeCache::mark_on_stack |
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2608 // part is too slow to be done serially, so it is handled during the weakRefsWorkParallelPart phase. |
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2609 // Defer the cleaning until we have complete on_stack data. |
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2610 MetadataOnStackMark md_on_stack(false /* Don't visit the code cache at this point */); |
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2611 |
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2612 bool purged_classes; |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2613 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2614 { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2615 G1RemarkGCTraceTime trace("System Dictionary Unloading", G1Log::finest()); |
20619
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2616 purged_classes = SystemDictionary::do_unloading(&g1_is_alive, false /* Defer klass cleaning */); |
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2617 } |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2618 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2619 { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2620 G1RemarkGCTraceTime trace("Parallel Unloading", G1Log::finest()); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2621 weakRefsWorkParallelPart(&g1_is_alive, purged_classes); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2622 } |
20619
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2623 |
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2624 { |
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2625 G1RemarkGCTraceTime trace("Deallocate Metadata", G1Log::finest()); |
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2626 ClassLoaderDataGraph::free_deallocate_lists(); |
b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
stefank
parents:
20543
diff
changeset
|
2627 } |
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2628 } |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2629 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2630 if (G1StringDedup::is_enabled()) { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2631 G1RemarkGCTraceTime trace("String Deduplication Unlink", G1Log::finest()); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2632 G1StringDedup::unlink(&g1_is_alive); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2633 } |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2634 } |
342 | 2635 } |
2636 | |
2637 void ConcurrentMark::swapMarkBitMaps() { | |
2638 CMBitMapRO* temp = _prevMarkBitMap; | |
2639 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2640 _nextMarkBitMap = (CMBitMap*) temp; | |
2641 } | |
2642 | |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2643 class CMObjectClosure; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2644 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2645 // Closure for iterating over objects, currently only used for |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2646 // processing SATB buffers. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2647 class CMObjectClosure : public ObjectClosure { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2648 private: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2649 CMTask* _task; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2650 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2651 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2652 void do_object(oop obj) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2653 _task->deal_with_reference(obj); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2654 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2655 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2656 CMObjectClosure(CMTask* task) : _task(task) { } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2657 }; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2658 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2659 class G1RemarkThreadsClosure : public ThreadClosure { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2660 CMObjectClosure _cm_obj; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2661 G1CMOopClosure _cm_cl; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2662 MarkingCodeBlobClosure _code_cl; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2663 int _thread_parity; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2664 bool _is_par; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2665 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2666 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2667 G1RemarkThreadsClosure(G1CollectedHeap* g1h, CMTask* task, bool is_par) : |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2668 _cm_obj(task), _cm_cl(g1h, g1h->concurrent_mark(), task), _code_cl(&_cm_cl, !CodeBlobToOopClosure::FixRelocations), |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2669 _thread_parity(SharedHeap::heap()->strong_roots_parity()), _is_par(is_par) {} |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2670 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2671 void do_thread(Thread* thread) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2672 if (thread->is_Java_thread()) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2673 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2674 JavaThread* jt = (JavaThread*)thread; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2675 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2676 // In theory it should not be neccessary to explicitly walk the nmethods to find roots for concurrent marking |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2677 // however the liveness of oops reachable from nmethods have very complex lifecycles: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2678 // * Alive if on the stack of an executing method |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2679 // * Weakly reachable otherwise |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2680 // Some objects reachable from nmethods, such as the class loader (or klass_holder) of the receiver should be |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2681 // live by the SATB invariant but other oops recorded in nmethods may behave differently. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2682 jt->nmethods_do(&_code_cl); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2683 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2684 jt->satb_mark_queue().apply_closure_and_empty(&_cm_obj); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2685 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2686 } else if (thread->is_VM_thread()) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2687 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2688 JavaThread::satb_mark_queue_set().shared_satb_queue()->apply_closure_and_empty(&_cm_obj); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2689 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2690 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2691 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2692 }; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2693 |
342 | 2694 class CMRemarkTask: public AbstractGangTask { |
2695 private: | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2696 ConcurrentMark* _cm; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2697 bool _is_serial; |
342 | 2698 public: |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2699 void work(uint worker_id) { |
342 | 2700 // Since all available tasks are actually started, we should |
2701 // only proceed if we're supposed to be actived. | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2702 if (worker_id < _cm->active_tasks()) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2703 CMTask* task = _cm->task(worker_id); |
342 | 2704 task->record_start_time(); |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2705 { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2706 ResourceMark rm; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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20263
diff
changeset
|
2707 HandleMark hm; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2708 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2709 G1RemarkThreadsClosure threads_f(G1CollectedHeap::heap(), task, !_is_serial); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2710 Threads::threads_do(&threads_f); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2711 } |
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8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2712 |
342 | 2713 do { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2714 task->do_marking_step(1000000000.0 /* something very large */, |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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diff
changeset
|
2715 true /* do_termination */, |
fa08949fe0cb
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diff
changeset
|
2716 _is_serial); |
342 | 2717 } while (task->has_aborted() && !_cm->has_overflown()); |
2718 // If we overflow, then we do not want to restart. We instead | |
2719 // want to abort remark and do concurrent marking again. | |
2720 task->record_end_time(); | |
2721 } | |
2722 } | |
2723 | |
8787
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8009536: G1: Apache Lucene hang during reference processing
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changeset
|
2724 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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diff
changeset
|
2725 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
4711 | 2726 _cm->terminator()->reset_for_reuse(active_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
2727 } |
342 | 2728 }; |
2729 | |
2730 void ConcurrentMark::checkpointRootsFinalWork() { | |
2731 ResourceMark rm; | |
2732 HandleMark hm; | |
2733 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2734 | |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2735 G1RemarkGCTraceTime trace("Finalize Marking", G1Log::finer()); |
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|
2736 |
342 | 2737 g1h->ensure_parsability(false); |
2738 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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1719
diff
changeset
|
2739 if (G1CollectedHeap::use_parallel_gc_threads()) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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diff
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|
2740 G1CollectedHeap::StrongRootsScope srs(g1h); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
2741 // this is remark, so we'll use up all active threads |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2742 uint active_workers = g1h->workers()->active_workers(); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
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|
2743 if (active_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
2744 assert(active_workers > 0, "Should have been set earlier"); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
2745 active_workers = (uint) ParallelGCThreads; |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
2746 g1h->workers()->set_active_workers(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
2747 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
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diff
changeset
|
2748 set_concurrency_and_phase(active_workers, false /* concurrent */); |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
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diff
changeset
|
2749 // Leave _parallel_marking_threads at it's |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4093
diff
changeset
|
2750 // value originally calculated in the ConcurrentMark |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4093
diff
changeset
|
2751 // constructor and pass values of the active workers |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
2752 // through the gang in the task. |
342 | 2753 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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diff
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|
2754 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2755 // We will start all available threads, even if we decide that the |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
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diff
changeset
|
2756 // active_workers will be fewer. The extra ones will just bail out |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
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diff
changeset
|
2757 // immediately. |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2758 g1h->set_par_threads(active_workers); |
342 | 2759 g1h->workers()->run_task(&remarkTask); |
2760 g1h->set_par_threads(0); | |
2761 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2762 G1CollectedHeap::StrongRootsScope srs(g1h); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2763 uint active_workers = 1; |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
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diff
changeset
|
2764 set_concurrency_and_phase(active_workers, false /* concurrent */); |
342 | 2765 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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diff
changeset
|
2766 // Note - if there's no work gang then the VMThread will be |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2767 // the thread to execute the remark - serially. We have |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2768 // to pass true for the is_serial parameter so that |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2769 // CMTask::do_marking_step() doesn't enter the sync |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2770 // barriers in the event of an overflow. Doing so will |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2771 // cause an assert that the current thread is not a |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2772 // concurrent GC thread. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2773 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
342 | 2774 remarkTask.work(0); |
2775 } | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
2776 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
8789
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
parents:
8788
diff
changeset
|
2777 guarantee(has_overflown() || |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
parents:
8788
diff
changeset
|
2778 satb_mq_set.completed_buffers_num() == 0, |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
parents:
8788
diff
changeset
|
2779 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
parents:
8788
diff
changeset
|
2780 BOOL_TO_STR(has_overflown()), |
1179172e9ec9
8008301: G1: guarantee(satb_mq_set.completed_buffers_num() == 0) failure
johnc
parents:
8788
diff
changeset
|
2781 satb_mq_set.completed_buffers_num())); |
342 | 2782 |
2783 print_stats(); | |
2784 } | |
2785 | |
1044 | 2786 #ifndef PRODUCT |
2787 | |
1388 | 2788 class PrintReachableOopClosure: public OopClosure { |
342 | 2789 private: |
2790 G1CollectedHeap* _g1h; | |
2791 outputStream* _out; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2792 VerifyOption _vo; |
1388 | 2793 bool _all; |
342 | 2794 |
2795 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2796 PrintReachableOopClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2797 VerifyOption vo, |
1388 | 2798 bool all) : |
1044 | 2799 _g1h(G1CollectedHeap::heap()), |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2800 _out(out), _vo(vo), _all(all) { } |
342 | 2801 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2802 void do_oop(narrowOop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2803 void do_oop( oop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2804 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2805 template <class T> void do_oop_work(T* p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2806 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2807 const char* str = NULL; |
2808 const char* str2 = ""; | |
2809 | |
1388 | 2810 if (obj == NULL) { |
2811 str = ""; | |
2812 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2813 str = " O"; | |
2814 } else { | |
342 | 2815 HeapRegion* hr = _g1h->heap_region_containing(obj); |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2816 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2817 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2818 |
2819 if (over_tams) { | |
1388 | 2820 str = " >"; |
2821 if (marked) { | |
342 | 2822 str2 = " AND MARKED"; |
1044 | 2823 } |
1388 | 2824 } else if (marked) { |
2825 str = " M"; | |
1044 | 2826 } else { |
1388 | 2827 str = " NOT"; |
1044 | 2828 } |
342 | 2829 } |
2830 | |
1388 | 2831 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
2832 p2i(p), p2i((void*) obj), str, str2); |
342 | 2833 } |
2834 }; | |
2835 | |
1388 | 2836 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2837 private: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2838 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2839 outputStream* _out; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2840 VerifyOption _vo; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2841 bool _all; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2842 HeapRegion* _hr; |
342 | 2843 |
2844 public: | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2845 PrintReachableObjectClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2846 VerifyOption vo, |
1388 | 2847 bool all, |
2848 HeapRegion* hr) : | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2849 _g1h(G1CollectedHeap::heap()), |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2850 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2851 |
2852 void do_object(oop o) { | |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
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6220
diff
changeset
|
2853 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
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diff
changeset
|
2854 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2855 bool print_it = _all || over_tams || marked; |
2856 | |
2857 if (print_it) { | |
2858 _out->print_cr(" "PTR_FORMAT"%s", | |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
2859 p2i((void *)o), (over_tams) ? " >" : (marked) ? " M" : ""); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2860 PrintReachableOopClosure oopCl(_out, _vo, _all); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
2861 o->oop_iterate_no_header(&oopCl); |
1388 | 2862 } |
342 | 2863 } |
2864 }; | |
2865 | |
1388 | 2866 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2867 private: |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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diff
changeset
|
2868 G1CollectedHeap* _g1h; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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diff
changeset
|
2869 outputStream* _out; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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diff
changeset
|
2870 VerifyOption _vo; |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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diff
changeset
|
2871 bool _all; |
342 | 2872 |
2873 public: | |
2874 bool doHeapRegion(HeapRegion* hr) { | |
2875 HeapWord* b = hr->bottom(); | |
2876 HeapWord* e = hr->end(); | |
2877 HeapWord* t = hr->top(); | |
6254
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diff
changeset
|
2878 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2879 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
2880 "TAMS: " PTR_FORMAT, p2i(b), p2i(e), p2i(t), p2i(p)); |
1388 | 2881 _out->cr(); |
2882 | |
2883 HeapWord* from = b; | |
2884 HeapWord* to = t; | |
2885 | |
2886 if (to > from) { | |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
2887 _out->print_cr("Objects in [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(from), p2i(to)); |
1388 | 2888 _out->cr(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2889 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2890 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2891 _out->cr(); | |
2892 } | |
342 | 2893 |
2894 return false; | |
2895 } | |
2896 | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2897 PrintReachableRegionClosure(outputStream* out, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3771
diff
changeset
|
2898 VerifyOption vo, |
1388 | 2899 bool all) : |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2900 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2901 }; |
2902 | |
1388 | 2903 void ConcurrentMark::print_reachable(const char* str, |
3772
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7004681: G1: Extend marking verification to Full GCs
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parents:
3771
diff
changeset
|
2904 VerifyOption vo, |
1388 | 2905 bool all) { |
2906 gclog_or_tty->cr(); | |
2907 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2908 |
2909 if (G1PrintReachableBaseFile == NULL) { | |
2910 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2911 return; | |
2912 } | |
2913 | |
2914 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2915 (JVM_MAXPATHLEN - 1)) { | |
2916 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2917 return; | |
2918 } | |
2919 | |
2920 char file_name[JVM_MAXPATHLEN]; | |
2921 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2922 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2923 | |
2924 fileStream fout(file_name); | |
2925 if (!fout.is_open()) { | |
2926 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2927 return; | |
2928 } | |
2929 | |
2930 outputStream* out = &fout; | |
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2931 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2932 out->cr(); |
2933 | |
1388 | 2934 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2935 out->cr(); |
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2936 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2937 _g1h->heap_region_iterate(&rcl); |
1044 | 2938 out->cr(); |
2939 | |
2940 gclog_or_tty->print_cr(" done"); | |
1388 | 2941 gclog_or_tty->flush(); |
342 | 2942 } |
2943 | |
1044 | 2944 #endif // PRODUCT |
2945 | |
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2946 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2947 // Note we are overriding the read-only view of the prev map here, via |
2948 // the cast. | |
2949 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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2950 } |
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2951 |
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2952 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2953 _nextMarkBitMap->clearRange(mr); |
2954 } | |
2955 | |
2956 HeapRegion* | |
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2957 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2958 // "checkpoint" the finger |
2959 HeapWord* finger = _finger; | |
2960 | |
2961 // _heap_end will not change underneath our feet; it only changes at | |
2962 // yield points. | |
2963 while (finger < _heap_end) { | |
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2964 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2965 |
3771 | 2966 // Note on how this code handles humongous regions. In the |
2967 // normal case the finger will reach the start of a "starts | |
2968 // humongous" (SH) region. Its end will either be the end of the | |
2969 // last "continues humongous" (CH) region in the sequence, or the | |
2970 // standard end of the SH region (if the SH is the only region in | |
2971 // the sequence). That way claim_region() will skip over the CH | |
2972 // regions. However, there is a subtle race between a CM thread | |
2973 // executing this method and a mutator thread doing a humongous | |
2974 // object allocation. The two are not mutually exclusive as the CM | |
2975 // thread does not need to hold the Heap_lock when it gets | |
2976 // here. So there is a chance that claim_region() will come across | |
2977 // a free region that's in the progress of becoming a SH or a CH | |
2978 // region. In the former case, it will either | |
2979 // a) Miss the update to the region's end, in which case it will | |
2980 // visit every subsequent CH region, will find their bitmaps | |
2981 // empty, and do nothing, or | |
2982 // b) Will observe the update of the region's end (in which case | |
2983 // it will skip the subsequent CH regions). | |
2984 // If it comes across a region that suddenly becomes CH, the | |
2985 // scenario will be similar to b). So, the race between | |
2986 // claim_region() and a humongous object allocation might force us | |
2987 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2988 // iterations) but it should not introduce and correctness issues. | |
20337 | 2989 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); |
2990 | |
2991 // Above heap_region_containing_raw may return NULL as we always scan claim | |
2992 // until the end of the heap. In this case, just jump to the next region. | |
2993 HeapWord* end = curr_region != NULL ? curr_region->end() : finger + HeapRegion::GrainWords; | |
3771 | 2994 |
2995 // Is the gap between reading the finger and doing the CAS too long? | |
2996 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
20337 | 2997 if (res == finger && curr_region != NULL) { |
342 | 2998 // we succeeded |
20337 | 2999 HeapWord* bottom = curr_region->bottom(); |
3000 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
3001 | |
3002 if (verbose_low()) { | |
3003 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " | |
3004 "["PTR_FORMAT", "PTR_FORMAT"), " | |
3005 "limit = "PTR_FORMAT, | |
3006 worker_id, p2i(curr_region), p2i(bottom), p2i(end), p2i(limit)); | |
3007 } | |
342 | 3008 |
3009 // notice that _finger == end cannot be guaranteed here since, | |
3010 // someone else might have moved the finger even further | |
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3011 assert(_finger >= end, "the finger should have moved forward"); |
342 | 3012 |
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3013 if (verbose_low()) { |
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3014 gclog_or_tty->print_cr("[%u] we were successful with region = " |
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3015 PTR_FORMAT, worker_id, p2i(curr_region)); |
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3016 } |
342 | 3017 |
3018 if (limit > bottom) { | |
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3019 if (verbose_low()) { |
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3020 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
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3021 "returning it ", worker_id, p2i(curr_region)); |
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3022 } |
342 | 3023 return curr_region; |
3024 } else { | |
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3025 assert(limit == bottom, |
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3026 "the region limit should be at bottom"); |
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3027 if (verbose_low()) { |
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3028 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
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3029 "returning NULL", worker_id, p2i(curr_region)); |
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3030 } |
342 | 3031 // we return NULL and the caller should try calling |
3032 // claim_region() again. | |
3033 return NULL; | |
3034 } | |
3035 } else { | |
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3036 assert(_finger > finger, "the finger should have moved forward"); |
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3037 if (verbose_low()) { |
20337 | 3038 if (curr_region == NULL) { |
3039 gclog_or_tty->print_cr("[%u] found uncommitted region, moving finger, " | |
3040 "global finger = "PTR_FORMAT", " | |
3041 "our finger = "PTR_FORMAT, | |
3042 worker_id, p2i(_finger), p2i(finger)); | |
3043 } else { | |
3044 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " | |
3045 "global finger = "PTR_FORMAT", " | |
3046 "our finger = "PTR_FORMAT, | |
3047 worker_id, p2i(_finger), p2i(finger)); | |
3048 } | |
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3049 } |
342 | 3050 |
3051 // read it again | |
3052 finger = _finger; | |
3053 } | |
3054 } | |
3055 | |
3056 return NULL; | |
3057 } | |
3058 | |
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3059 #ifndef PRODUCT |
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3060 enum VerifyNoCSetOopsPhase { |
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3061 VerifyNoCSetOopsStack, |
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3062 VerifyNoCSetOopsQueues, |
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3063 VerifyNoCSetOopsSATBCompleted, |
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3064 VerifyNoCSetOopsSATBThread |
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3065 }; |
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3066 |
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3067 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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3068 private: |
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3069 G1CollectedHeap* _g1h; |
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3070 VerifyNoCSetOopsPhase _phase; |
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3071 int _info; |
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3072 |
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3073 const char* phase_str() { |
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|
3074 switch (_phase) { |
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|
3075 case VerifyNoCSetOopsStack: return "Stack"; |
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3076 case VerifyNoCSetOopsQueues: return "Queue"; |
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3077 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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3078 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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|
3079 default: ShouldNotReachHere(); |
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|
3080 } |
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3081 return NULL; |
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|
3082 } |
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|
3083 |
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|
3084 void do_object_work(oop obj) { |
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|
3085 guarantee(!_g1h->obj_in_cs(obj), |
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|
3086 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
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3087 p2i((void*) obj), phase_str(), _info)); |
4787
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3088 } |
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|
3089 |
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|
3090 public: |
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3091 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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3092 |
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3093 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
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3094 _phase = phase; |
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|
3095 _info = info; |
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|
3096 } |
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|
3097 |
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|
3098 virtual void do_oop(oop* p) { |
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3099 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
3100 do_object_work(obj); |
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|
3101 } |
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|
3102 |
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|
3103 virtual void do_oop(narrowOop* p) { |
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|
3104 // We should not come across narrow oops while scanning marking |
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|
3105 // stacks and SATB buffers. |
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|
3106 ShouldNotReachHere(); |
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|
3107 } |
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|
3108 |
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|
3109 virtual void do_object(oop obj) { |
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|
3110 do_object_work(obj); |
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|
3111 } |
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|
3112 }; |
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|
3113 |
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|
3114 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
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|
3115 bool verify_enqueued_buffers, |
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|
3116 bool verify_thread_buffers, |
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|
3117 bool verify_fingers) { |
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|
3118 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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3119 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
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|
3120 return; |
342 | 3121 } |
1835
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|
3122 |
4787
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3123 VerifyNoCSetOopsClosure cl; |
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|
3124 |
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|
3125 if (verify_stacks) { |
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|
3126 // Verify entries on the global mark stack |
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|
3127 cl.set_phase(VerifyNoCSetOopsStack); |
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|
3128 _markStack.oops_do(&cl); |
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|
3129 |
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|
3130 // Verify entries on the task queues |
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3131 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
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|
3132 cl.set_phase(VerifyNoCSetOopsQueues, i); |
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diff
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|
3133 CMTaskQueue* queue = _task_queues->queue(i); |
4787
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diff
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|
3134 queue->oops_do(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3135 } |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3136 } |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3137 |
2ace1c4ee8da
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tonyp
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diff
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|
3138 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3139 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3140 // Verify entries on the enqueued SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3141 if (verify_enqueued_buffers) { |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3142 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3143 satb_qs.iterate_completed_buffers_read_only(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3144 } |
2ace1c4ee8da
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tonyp
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diff
changeset
|
3145 |
2ace1c4ee8da
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tonyp
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diff
changeset
|
3146 // Verify entries on the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3147 if (verify_thread_buffers) { |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3148 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3149 satb_qs.iterate_thread_buffers_read_only(&cl); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
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|
3150 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
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|
3151 |
4787
2ace1c4ee8da
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diff
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|
3152 if (verify_fingers) { |
2ace1c4ee8da
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tonyp
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diff
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|
3153 // Verify the global finger |
2ace1c4ee8da
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tonyp
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diff
changeset
|
3154 HeapWord* global_finger = finger(); |
2ace1c4ee8da
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parents:
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diff
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|
3155 if (global_finger != NULL && global_finger < _heap_end) { |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3156 // The global finger always points to a heap region boundary. We |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3157 // use heap_region_containing_raw() to get the containing region |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3158 // given that the global finger could be pointing to a free region |
2ace1c4ee8da
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tonyp
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diff
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|
3159 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3160 // happens, heap_region_containing() will return the bottom of the |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3161 // corresponding starts humongous region and the check below will |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3162 // not hold any more. |
20337 | 3163 // Since we always iterate over all regions, we might get a NULL HeapRegion |
3164 // here. | |
4787
2ace1c4ee8da
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tonyp
parents:
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|
3165 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
20337 | 3166 guarantee(global_hr == NULL || global_finger == global_hr->bottom(), |
4787
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3167 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
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|
3168 p2i(global_finger), HR_FORMAT_PARAMS(global_hr))); |
4787
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3169 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3170 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3171 // Verify the task fingers |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3172 assert(parallel_marking_threads() <= _max_worker_id, "sanity"); |
4787
2ace1c4ee8da
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tonyp
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diff
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|
3173 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3174 CMTask* task = _tasks[i]; |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3175 HeapWord* task_finger = task->finger(); |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3176 if (task_finger != NULL && task_finger < _heap_end) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3177 // See above note on the global finger verification. |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3178 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
20337 | 3179 guarantee(task_hr == NULL || task_finger == task_hr->bottom() || |
4787
2ace1c4ee8da
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parents:
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diff
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|
3180 !task_hr->in_collection_set(), |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3181 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3182 p2i(task_finger), HR_FORMAT_PARAMS(task_hr))); |
4787
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3183 } |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3184 } |
2ace1c4ee8da
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tonyp
parents:
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diff
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|
3185 } |
342 | 3186 } |
4787
2ace1c4ee8da
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|
3187 #endif // PRODUCT |
342 | 3188 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3189 // Aggregate the counting data that was constructed concurrently |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3190 // with marking. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3191 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3192 G1CollectedHeap* _g1h; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
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|
3193 ConcurrentMark* _cm; |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3194 CardTableModRefBS* _ct_bs; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3195 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3196 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3197 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3198 public: |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3199 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3200 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3201 uint max_worker_id) : |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3202 _g1h(g1h), _cm(g1h->concurrent_mark()), |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3203 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3204 _cm_card_bm(cm_card_bm), _max_worker_id(max_worker_id) { } |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3205 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3206 bool doHeapRegion(HeapRegion* hr) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3207 if (hr->continuesHumongous()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3208 // We will ignore these here and process them when their |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3209 // associated "starts humongous" region is processed. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3210 // Note that we cannot rely on their associated |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3211 // "starts humongous" region to have their bit set to 1 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3212 // since, due to the region chunking in the parallel region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3213 // iteration, a "continues humongous" region might be visited |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3214 // before its associated "starts humongous". |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3215 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3216 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3217 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3218 HeapWord* start = hr->bottom(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3219 HeapWord* limit = hr->next_top_at_mark_start(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3220 HeapWord* end = hr->end(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3221 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3222 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3223 err_msg("Preconditions not met - " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3224 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3225 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3226 p2i(start), p2i(limit), p2i(hr->top()), p2i(hr->end()))); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3227 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3228 assert(hr->next_marked_bytes() == 0, "Precondition"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3229 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3230 if (start == limit) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3231 // 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
|
3232 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3233 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3234 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3235 // 'start' should be in the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3236 assert(_g1h->is_in_g1_reserved(start) && _ct_bs->is_card_aligned(start), "sanity"); |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3237 // 'end' *may* be just beyone the end of the heap (if hr is the last region) |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3238 assert(!_g1h->is_in_g1_reserved(end) || _ct_bs->is_card_aligned(end), "sanity"); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3239 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3240 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
|
3241 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
|
3242 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
|
3243 |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3244 // If ntams is not card aligned then we bump card bitmap index |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3245 // for limit so that we get the all the cards spanned by |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3246 // the object ending at ntams. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3247 // Note: if this is the last region in the heap then ntams |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3248 // could be actually just beyond the end of the the heap; |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3249 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3250 // that is also outside the heap. |
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3251 if (_g1h->is_in_g1_reserved(limit) && !_ct_bs->is_card_aligned(limit)) { |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3252 limit_idx += 1; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3253 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3254 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3255 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3256 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3257 // Aggregate the "stripe" in the count data associated with hr. |
20377
a8ea2f110d87
8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents:
20337
diff
changeset
|
3258 uint hrm_index = hr->hrm_index(); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3259 size_t marked_bytes = 0; |
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diff
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|
3260 |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3261 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
d30fa85f9994
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diff
changeset
|
3262 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
d30fa85f9994
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|
3263 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
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|
3264 |
d30fa85f9994
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parents:
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diff
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|
3265 // Fetch the marked_bytes in this region for task i and |
d30fa85f9994
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parents:
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diff
changeset
|
3266 // add it to the running total for this region. |
20377
a8ea2f110d87
8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents:
20337
diff
changeset
|
3267 marked_bytes += marked_bytes_array[hrm_index]; |
4836
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diff
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|
3268 |
6862
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parents:
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diff
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|
3269 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
4836
d30fa85f9994
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diff
changeset
|
3270 // into the global card bitmap. |
d30fa85f9994
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diff
changeset
|
3271 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
d30fa85f9994
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|
3272 |
d30fa85f9994
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diff
changeset
|
3273 while (scan_idx < limit_idx) { |
d30fa85f9994
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diff
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|
3274 assert(task_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
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parents:
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diff
changeset
|
3275 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
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diff
changeset
|
3276 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
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diff
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|
3277 |
d30fa85f9994
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parents:
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diff
changeset
|
3278 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
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parents:
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diff
changeset
|
3279 // its left_offset parameter is greater than its right_offset |
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3280 // parameter. It does, however, have an early exit if |
4836
d30fa85f9994
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parents:
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diff
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|
3281 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
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diff
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|
3282 // passed in for left offset here. |
d30fa85f9994
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parents:
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diff
changeset
|
3283 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
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|
3284 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
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|
3285 } |
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parents:
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diff
changeset
|
3286 } |
d30fa85f9994
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parents:
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diff
changeset
|
3287 |
d30fa85f9994
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parents:
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diff
changeset
|
3288 // Update the marked bytes for this region. |
d30fa85f9994
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changeset
|
3289 hr->add_to_marked_bytes(marked_bytes); |
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|
3290 |
d30fa85f9994
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parents:
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diff
changeset
|
3291 // Next heap region |
d30fa85f9994
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parents:
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|
3292 return false; |
d30fa85f9994
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parents:
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|
3293 } |
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|
3294 }; |
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diff
changeset
|
3295 |
d30fa85f9994
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|
3296 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
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diff
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|
3297 protected: |
d30fa85f9994
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parents:
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diff
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|
3298 G1CollectedHeap* _g1h; |
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diff
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|
3299 ConcurrentMark* _cm; |
d30fa85f9994
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parents:
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diff
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|
3300 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
6812
diff
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|
3301 uint _max_worker_id; |
4836
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|
3302 int _active_workers; |
d30fa85f9994
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diff
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|
3303 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
3304 public: |
d30fa85f9994
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parents:
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diff
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|
3305 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
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diff
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|
3306 ConcurrentMark* cm, |
d30fa85f9994
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diff
changeset
|
3307 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3308 uint max_worker_id, |
4836
d30fa85f9994
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parents:
4830
diff
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|
3309 int n_workers) : |
d30fa85f9994
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parents:
4830
diff
changeset
|
3310 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3311 _g1h(g1h), _cm(cm), _cm_card_bm(cm_card_bm), |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3312 _max_worker_id(max_worker_id), |
4836
d30fa85f9994
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parents:
4830
diff
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|
3313 _active_workers(n_workers) { } |
d30fa85f9994
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parents:
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diff
changeset
|
3314 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
3315 void work(uint worker_id) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3316 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
4836
d30fa85f9994
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parents:
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diff
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|
3317 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3318 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
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parents:
4830
diff
changeset
|
3319 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
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parents:
4830
diff
changeset
|
3320 _active_workers, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3321 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3322 } else { |
d30fa85f9994
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parents:
4830
diff
changeset
|
3323 _g1h->heap_region_iterate(&cl); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3324 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3325 } |
d30fa85f9994
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parents:
4830
diff
changeset
|
3326 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3327 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3328 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3329 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
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parents:
4830
diff
changeset
|
3330 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3331 _g1h->workers()->active_workers() : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3332 1); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3333 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3334 G1AggregateCountDataTask g1_par_agg_task(_g1h, this, &_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3335 _max_worker_id, n_workers); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3336 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3337 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3338 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3339 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3340 _g1h->set_par_threads(n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3341 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3342 _g1h->set_par_threads(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3343 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3344 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3345 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3346 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3347 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3348 g1_par_agg_task.work(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3349 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3350 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3351 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3352 // 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
|
3353 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3354 // 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
|
3355 // liveness count aggregation (during remark) and the |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3356 // final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3357 _card_bm.clear(); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3358 |
d30fa85f9994
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parents:
4830
diff
changeset
|
3359 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3360 // of the final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3361 _region_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3362 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3363 uint max_regions = _g1h->max_regions(); |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3364 assert(_max_worker_id > 0, "uninitialized"); |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3365 |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3366 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
d30fa85f9994
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parents:
4830
diff
changeset
|
3367 BitMap* task_card_bm = count_card_bitmap_for(i); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3368 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3369 |
d30fa85f9994
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parents:
4830
diff
changeset
|
3370 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
d30fa85f9994
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parents:
4830
diff
changeset
|
3371 assert(marked_bytes_array != NULL, "uninitialized"); |
d30fa85f9994
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4830
diff
changeset
|
3372 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3373 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
4836
d30fa85f9994
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4830
diff
changeset
|
3374 task_card_bm->clear(); |
d30fa85f9994
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4830
diff
changeset
|
3375 } |
d30fa85f9994
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diff
changeset
|
3376 } |
d30fa85f9994
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diff
changeset
|
3377 |
342 | 3378 void ConcurrentMark::print_stats() { |
3379 if (verbose_stats()) { | |
3380 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3381 for (size_t i = 0; i < _active_tasks; ++i) { | |
3382 _tasks[i]->print_stats(); | |
3383 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3384 } | |
3385 } | |
3386 } | |
3387 | |
3388 // abandon current marking iteration due to a Full GC | |
3389 void ConcurrentMark::abort() { | |
20302
3bf2fc51186b
8048085: Aborting marking just before remark results in useless additional clearing of the next mark bitmap
tschatzl
parents:
20282
diff
changeset
|
3390 // Clear all marks in the next bitmap for the next marking cycle. This will allow us to skip the next |
3bf2fc51186b
8048085: Aborting marking just before remark results in useless additional clearing of the next mark bitmap
tschatzl
parents:
20282
diff
changeset
|
3391 // concurrent bitmap clearing. |
342 | 3392 _nextMarkBitMap->clearAll(); |
20291
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
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|
3393 |
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7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
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|
3394 // Note we cannot clear the previous marking bitmap here |
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|
3395 // since VerifyDuringGC verifies the objects marked during |
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|
3396 // a full GC against the previous bitmap. |
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|
3397 |
4836
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|
3398 // Clear the liveness counting data |
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|
3399 clear_all_count_data(); |
342 | 3400 // Empty mark stack |
7450
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|
3401 reset_marking_state(); |
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|
3402 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3403 _tasks[i]->clear_region_fields(); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
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1833
diff
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|
3404 } |
17949
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
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|
3405 _first_overflow_barrier_sync.abort(); |
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
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|
3406 _second_overflow_barrier_sync.abort(); |
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0982ec23da03
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|
3407 const GCId& gc_id = _g1h->gc_tracer_cm()->gc_id(); |
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|
3408 if (!gc_id.is_undefined()) { |
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|
3409 // We can do multiple full GCs before ConcurrentMarkThread::run() gets a chance |
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|
3410 // to detect that it was aborted. Only keep track of the first GC id that we aborted. |
0982ec23da03
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|
3411 _aborted_gc_id = gc_id; |
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|
3412 } |
342 | 3413 _has_aborted = true; |
3414 | |
3415 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3416 satb_mq_set.abandon_partial_marking(); | |
1317
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6935821: G1: threads created during marking do not active their SATB queues
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|
3417 // This can be called either during or outside marking, we'll read |
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3418 // the expected_active value from the SATB queue set. |
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|
3419 satb_mq_set.set_active_all_threads( |
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|
3420 false, /* new active value */ |
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|
3421 satb_mq_set.is_active() /* expected_active */); |
10405 | 3422 |
3423 _g1h->trace_heap_after_concurrent_cycle(); | |
3424 _g1h->register_concurrent_cycle_end(); | |
342 | 3425 } |
3426 | |
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0982ec23da03
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|
3427 const GCId& ConcurrentMark::concurrent_gc_id() { |
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|
3428 if (has_aborted()) { |
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|
3429 return _aborted_gc_id; |
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|
3430 } |
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|
3431 return _g1h->gc_tracer_cm()->gc_id(); |
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|
3432 } |
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|
3433 |
342 | 3434 static void print_ms_time_info(const char* prefix, const char* name, |
3435 NumberSeq& ns) { | |
3436 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3437 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3438 if (ns.num() > 0) { | |
3439 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3440 prefix, ns.sd(), ns.maximum()); | |
3441 } | |
3442 } | |
3443 | |
3444 void ConcurrentMark::print_summary_info() { | |
3445 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3446 print_ms_time_info(" ", "init marks", _init_times); | |
3447 print_ms_time_info(" ", "remarks", _remark_times); | |
3448 { | |
3449 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3450 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3451 | |
3452 } | |
3453 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3454 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3455 _total_counting_time, | |
3456 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3457 (double)_cleanup_times.num() | |
3458 : 0.0)); | |
3459 if (G1ScrubRemSets) { | |
3460 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3461 _total_rs_scrub_time, | |
3462 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3463 (double)_cleanup_times.num() | |
3464 : 0.0)); | |
3465 } | |
3466 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3467 (_init_times.sum() + _remark_times.sum() + | |
3468 _cleanup_times.sum())/1000.0); | |
3469 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
4836
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3470 "(%8.2f s marking).", |
342 | 3471 cmThread()->vtime_accum(), |
4836
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|
3472 cmThread()->vtime_mark_accum()); |
342 | 3473 } |
3474 | |
1019 | 3475 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
8008
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changeset
|
3476 if (use_parallel_marking_threads()) { |
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8005875: G1: Kitchensink fails with ParallelGCThreads=0
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|
3477 _parallel_workers->print_worker_threads_on(st); |
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|
3478 } |
1019 | 3479 } |
3480 | |
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|
3481 void ConcurrentMark::print_on_error(outputStream* st) const { |
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diff
changeset
|
3482 st->print_cr("Marking Bits (Prev, Next): (CMBitMap*) " PTR_FORMAT ", (CMBitMap*) " PTR_FORMAT, |
17937
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|
3483 p2i(_prevMarkBitMap), p2i(_nextMarkBitMap)); |
9076
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|
3484 _prevMarkBitMap->print_on_error(st, " Prev Bits: "); |
7b835924c31c
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changeset
|
3485 _nextMarkBitMap->print_on_error(st, " Next Bits: "); |
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|
3486 } |
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diff
changeset
|
3487 |
342 | 3488 // We take a break if someone is trying to stop the world. |
4728
441e946dc1af
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jmasa
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diff
changeset
|
3489 bool ConcurrentMark::do_yield_check(uint worker_id) { |
20192 | 3490 if (SuspendibleThreadSet::should_yield()) { |
4728
441e946dc1af
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diff
changeset
|
3491 if (worker_id == 0) { |
342 | 3492 _g1h->g1_policy()->record_concurrent_pause(); |
3776
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|
3493 } |
20192 | 3494 SuspendibleThreadSet::yield(); |
342 | 3495 return true; |
3496 } else { | |
3497 return false; | |
3498 } | |
3499 } | |
3500 | |
3501 #ifndef PRODUCT | |
3502 // for debugging purposes | |
3503 void ConcurrentMark::print_finger() { | |
3504 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
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|
3505 p2i(_heap_start), p2i(_heap_end), p2i(_finger)); |
6862
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|
3506 for (uint i = 0; i < _max_worker_id; ++i) { |
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|
3507 gclog_or_tty->print(" %u: " PTR_FORMAT, i, p2i(_tasks[i]->finger())); |
342 | 3508 } |
17937
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diff
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|
3509 gclog_or_tty->cr(); |
342 | 3510 } |
3511 #endif | |
3512 | |
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diff
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|
3513 template<bool scan> |
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diff
changeset
|
3514 inline void CMTask::process_grey_object(oop obj) { |
b7c8142a9e0b
8069367: Eagerly reclaimed humongous objects left on mark stack
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22977
diff
changeset
|
3515 assert(scan || obj->is_typeArray(), "Skipping scan of grey non-typeArray"); |
3771 | 3516 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); |
3517 | |
3518 if (_cm->verbose_high()) { | |
23026
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8069367: Eagerly reclaimed humongous objects left on mark stack
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22977
diff
changeset
|
3519 gclog_or_tty->print_cr("[%u] processing grey object " PTR_FORMAT, |
17937
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diff
changeset
|
3520 _worker_id, p2i((void*) obj)); |
3771 | 3521 } |
3522 | |
3523 size_t obj_size = obj->size(); | |
3524 _words_scanned += obj_size; | |
3525 | |
23026
b7c8142a9e0b
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kbarrett
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diff
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|
3526 if (scan) { |
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22977
diff
changeset
|
3527 obj->oop_iterate(_cm_oop_closure); |
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8069367: Eagerly reclaimed humongous objects left on mark stack
kbarrett
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22977
diff
changeset
|
3528 } |
3771 | 3529 statsOnly( ++_objs_scanned ); |
3530 check_limits(); | |
3531 } | |
3532 | |
23026
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diff
changeset
|
3533 template void CMTask::process_grey_object<true>(oop); |
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diff
changeset
|
3534 template void CMTask::process_grey_object<false>(oop); |
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diff
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|
3535 |
342 | 3536 // Closure for iteration over bitmaps |
3537 class CMBitMapClosure : public BitMapClosure { | |
3538 private: | |
3539 // the bitmap that is being iterated over | |
3540 CMBitMap* _nextMarkBitMap; | |
3541 ConcurrentMark* _cm; | |
3542 CMTask* _task; | |
3543 | |
3544 public: | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
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4837
diff
changeset
|
3545 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
2a0172480595
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changeset
|
3546 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3547 |
3548 bool do_bit(size_t offset) { | |
3549 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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|
3550 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
11d4857fe5e1
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diff
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|
3551 assert( addr < _cm->finger(), "invariant"); |
342 | 3552 |
5988
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|
3553 statsOnly( _task->increase_objs_found_on_bitmap() ); |
2a0172480595
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4837
diff
changeset
|
3554 assert(addr >= _task->finger(), "invariant"); |
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changeset
|
3555 |
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changeset
|
3556 // We move that task's local finger along. |
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changeset
|
3557 _task->move_finger_to(addr); |
342 | 3558 |
3559 _task->scan_object(oop(addr)); | |
3560 // we only partially drain the local queue and global stack | |
3561 _task->drain_local_queue(true); | |
3562 _task->drain_global_stack(true); | |
3563 | |
3564 // if the has_aborted flag has been raised, we need to bail out of | |
3565 // the iteration | |
3566 return !_task->has_aborted(); | |
3567 } | |
3568 }; | |
3569 | |
3771 | 3570 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3571 ConcurrentMark* cm, | |
3572 CMTask* task) | |
3573 : _g1h(g1h), _cm(cm), _task(task) { | |
3574 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3575 | |
3576 if (G1UseConcMarkReferenceProcessing) { | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
diff
changeset
|
3577 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3578 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3579 } |
3771 | 3580 } |
342 | 3581 |
3582 void CMTask::setup_for_region(HeapRegion* hr) { | |
1023
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|
3583 assert(hr != NULL, |
20335
eec72fa4b108
8040722: G1: Clean up usages of heap_region_containing
brutisso
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20310
diff
changeset
|
3584 "claim_region() should have filtered out NULL regions"); |
1023
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diff
changeset
|
3585 assert(!hr->continuesHumongous(), |
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diff
changeset
|
3586 "claim_region() should have filtered out continues humongous regions"); |
342 | 3587 |
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|
3588 if (_cm->verbose_low()) { |
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diff
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|
3589 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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|
3590 _worker_id, p2i(hr)); |
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|
3591 } |
342 | 3592 |
3593 _curr_region = hr; | |
3594 _finger = hr->bottom(); | |
3595 update_region_limit(); | |
3596 } | |
3597 | |
3598 void CMTask::update_region_limit() { | |
3599 HeapRegion* hr = _curr_region; | |
3600 HeapWord* bottom = hr->bottom(); | |
3601 HeapWord* limit = hr->next_top_at_mark_start(); | |
3602 | |
3603 if (limit == bottom) { | |
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changeset
|
3604 if (_cm->verbose_low()) { |
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diff
changeset
|
3605 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3606 "["PTR_FORMAT", "PTR_FORMAT")", |
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|
3607 _worker_id, p2i(bottom), p2i(limit)); |
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|
3608 } |
342 | 3609 // The region was collected underneath our feet. |
3610 // We set the finger to bottom to ensure that the bitmap | |
3611 // iteration that will follow this will not do anything. | |
3612 // (this is not a condition that holds when we set the region up, | |
3613 // as the region is not supposed to be empty in the first place) | |
3614 _finger = bottom; | |
3615 } else if (limit >= _region_limit) { | |
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diff
changeset
|
3616 assert(limit >= _finger, "peace of mind"); |
342 | 3617 } else { |
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changeset
|
3618 assert(limit < _region_limit, "only way to get here"); |
342 | 3619 // This can happen under some pretty unusual circumstances. An |
3620 // evacuation pause empties the region underneath our feet (NTAMS | |
3621 // at bottom). We then do some allocation in the region (NTAMS | |
3622 // stays at bottom), followed by the region being used as a GC | |
3623 // alloc region (NTAMS will move to top() and the objects | |
3624 // originally below it will be grayed). All objects now marked in | |
3625 // the region are explicitly grayed, if below the global finger, | |
3626 // and we do not need in fact to scan anything else. So, we simply | |
3627 // set _finger to be limit to ensure that the bitmap iteration | |
3628 // doesn't do anything. | |
3629 _finger = limit; | |
3630 } | |
3631 | |
3632 _region_limit = limit; | |
3633 } | |
3634 | |
3635 void CMTask::giveup_current_region() { | |
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3636 assert(_curr_region != NULL, "invariant"); |
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3637 if (_cm->verbose_low()) { |
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3638 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3639 _worker_id, p2i(_curr_region)); |
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3640 } |
342 | 3641 clear_region_fields(); |
3642 } | |
3643 | |
3644 void CMTask::clear_region_fields() { | |
3645 // Values for these three fields that indicate that we're not | |
3646 // holding on to a region. | |
3647 _curr_region = NULL; | |
3648 _finger = NULL; | |
3649 _region_limit = NULL; | |
3650 } | |
3651 | |
3771 | 3652 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3653 if (cm_oop_closure == NULL) { | |
3654 assert(_cm_oop_closure != NULL, "invariant"); | |
3655 } else { | |
3656 assert(_cm_oop_closure == NULL, "invariant"); | |
3657 } | |
3658 _cm_oop_closure = cm_oop_closure; | |
3659 } | |
3660 | |
342 | 3661 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3662 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3663 |
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3664 if (_cm->verbose_low()) { |
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3665 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3666 } |
342 | 3667 |
3668 _nextMarkBitMap = nextMarkBitMap; | |
3669 clear_region_fields(); | |
3670 | |
3671 _calls = 0; | |
3672 _elapsed_time_ms = 0.0; | |
3673 _termination_time_ms = 0.0; | |
3674 _termination_start_time_ms = 0.0; | |
3675 | |
3676 #if _MARKING_STATS_ | |
3677 _local_pushes = 0; | |
3678 _local_pops = 0; | |
3679 _local_max_size = 0; | |
3680 _objs_scanned = 0; | |
3681 _global_pushes = 0; | |
3682 _global_pops = 0; | |
3683 _global_max_size = 0; | |
3684 _global_transfers_to = 0; | |
3685 _global_transfers_from = 0; | |
3686 _regions_claimed = 0; | |
3687 _objs_found_on_bitmap = 0; | |
3688 _satb_buffers_processed = 0; | |
3689 _steal_attempts = 0; | |
3690 _steals = 0; | |
3691 _aborted = 0; | |
3692 _aborted_overflow = 0; | |
3693 _aborted_cm_aborted = 0; | |
3694 _aborted_yield = 0; | |
3695 _aborted_timed_out = 0; | |
3696 _aborted_satb = 0; | |
3697 _aborted_termination = 0; | |
3698 #endif // _MARKING_STATS_ | |
3699 } | |
3700 | |
3701 bool CMTask::should_exit_termination() { | |
3702 regular_clock_call(); | |
3703 // This is called when we are in the termination protocol. We should | |
3704 // quit if, for some reason, this task wants to abort or the global | |
3705 // stack is not empty (this means that we can get work from it). | |
3706 return !_cm->mark_stack_empty() || has_aborted(); | |
3707 } | |
3708 | |
3709 void CMTask::reached_limit() { | |
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3710 assert(_words_scanned >= _words_scanned_limit || |
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3711 _refs_reached >= _refs_reached_limit , |
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3712 "shouldn't have been called otherwise"); |
342 | 3713 regular_clock_call(); |
3714 } | |
3715 | |
3716 void CMTask::regular_clock_call() { | |
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3717 if (has_aborted()) return; |
342 | 3718 |
3719 // First, we need to recalculate the words scanned and refs reached | |
3720 // limits for the next clock call. | |
3721 recalculate_limits(); | |
3722 | |
3723 // During the regular clock call we do the following | |
3724 | |
3725 // (1) If an overflow has been flagged, then we abort. | |
3726 if (_cm->has_overflown()) { | |
3727 set_has_aborted(); | |
3728 return; | |
3729 } | |
3730 | |
3731 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3732 // to check anything else. The other steps are only needed during | |
3733 // the concurrent marking phase. | |
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3734 if (!concurrent()) return; |
342 | 3735 |
3736 // (2) If marking has been aborted for Full GC, then we also abort. | |
3737 if (_cm->has_aborted()) { | |
3738 set_has_aborted(); | |
3739 statsOnly( ++_aborted_cm_aborted ); | |
3740 return; | |
3741 } | |
3742 | |
3743 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3744 | |
3745 // (3) If marking stats are enabled, then we update the step history. | |
3746 #if _MARKING_STATS_ | |
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3747 if (_words_scanned >= _words_scanned_limit) { |
342 | 3748 ++_clock_due_to_scanning; |
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3749 } |
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3750 if (_refs_reached >= _refs_reached_limit) { |
342 | 3751 ++_clock_due_to_marking; |
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3752 } |
342 | 3753 |
3754 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3755 _interval_start_time_ms = curr_time_ms; | |
3756 _all_clock_intervals_ms.add(last_interval_ms); | |
3757 | |
3758 if (_cm->verbose_medium()) { | |
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3759 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
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3760 "scanned = "SIZE_FORMAT"%s, refs reached = "SIZE_FORMAT"%s", |
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3761 _worker_id, last_interval_ms, |
3776
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3762 _words_scanned, |
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3763 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3764 _refs_reached, |
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3765 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3766 } |
3767 #endif // _MARKING_STATS_ | |
3768 | |
3769 // (4) We check whether we should yield. If we have to, then we abort. | |
20192 | 3770 if (SuspendibleThreadSet::should_yield()) { |
342 | 3771 // We should yield. To do this we abort the task. The caller is |
3772 // responsible for yielding. | |
3773 set_has_aborted(); | |
3774 statsOnly( ++_aborted_yield ); | |
3775 return; | |
3776 } | |
3777 | |
3778 // (5) We check whether we've reached our time quota. If we have, | |
3779 // then we abort. | |
3780 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3781 if (elapsed_time_ms > _time_target_ms) { | |
3782 set_has_aborted(); | |
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3783 _has_timed_out = true; |
342 | 3784 statsOnly( ++_aborted_timed_out ); |
3785 return; | |
3786 } | |
3787 | |
3788 // (6) Finally, we check whether there are enough completed STAB | |
3789 // buffers available for processing. If there are, we abort. | |
3790 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3791 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
3776
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3792 if (_cm->verbose_low()) { |
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3793 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3794 _worker_id); |
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3795 } |
342 | 3796 // we do need to process SATB buffers, we'll abort and restart |
3797 // the marking task to do so | |
3798 set_has_aborted(); | |
3799 statsOnly( ++_aborted_satb ); | |
3800 return; | |
3801 } | |
3802 } | |
3803 | |
3804 void CMTask::recalculate_limits() { | |
3805 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3806 _words_scanned_limit = _real_words_scanned_limit; | |
3807 | |
3808 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3809 _refs_reached_limit = _real_refs_reached_limit; | |
3810 } | |
3811 | |
3812 void CMTask::decrease_limits() { | |
3813 // This is called when we believe that we're going to do an infrequent | |
3814 // operation which will increase the per byte scanned cost (i.e. move | |
3815 // entries to/from the global stack). It basically tries to decrease the | |
3816 // scanning limit so that the clock is called earlier. | |
3817 | |
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3818 if (_cm->verbose_medium()) { |
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3819 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
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3820 } |
342 | 3821 |
3822 _words_scanned_limit = _real_words_scanned_limit - | |
3823 3 * words_scanned_period / 4; | |
3824 _refs_reached_limit = _real_refs_reached_limit - | |
3825 3 * refs_reached_period / 4; | |
3826 } | |
3827 | |
3828 void CMTask::move_entries_to_global_stack() { | |
3829 // local array where we'll store the entries that will be popped | |
3830 // from the local queue | |
3831 oop buffer[global_stack_transfer_size]; | |
3832 | |
3833 int n = 0; | |
3834 oop obj; | |
3835 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3836 buffer[n] = obj; | |
3837 ++n; | |
3838 } | |
3839 | |
3840 if (n > 0) { | |
3841 // we popped at least one entry from the local queue | |
3842 | |
3843 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3844 | |
3845 if (!_cm->mark_stack_push(buffer, n)) { | |
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3846 if (_cm->verbose_low()) { |
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3847 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3848 _worker_id); |
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3849 } |
342 | 3850 set_has_aborted(); |
3851 } else { | |
3852 // the transfer was successful | |
3853 | |
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3854 if (_cm->verbose_medium()) { |
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3855 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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3856 _worker_id, n); |
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3857 } |
342 | 3858 statsOnly( int tmp_size = _cm->mark_stack_size(); |
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3859 if (tmp_size > _global_max_size) { |
342 | 3860 _global_max_size = tmp_size; |
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3861 } |
342 | 3862 _global_pushes += n ); |
3863 } | |
3864 } | |
3865 | |
3866 // this operation was quite expensive, so decrease the limits | |
3867 decrease_limits(); | |
3868 } | |
3869 | |
3870 void CMTask::get_entries_from_global_stack() { | |
3871 // local array where we'll store the entries that will be popped | |
3872 // from the global stack. | |
3873 oop buffer[global_stack_transfer_size]; | |
3874 int n; | |
3875 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
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3876 assert(n <= global_stack_transfer_size, |
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3877 "we should not pop more than the given limit"); |
342 | 3878 if (n > 0) { |
3879 // yes, we did actually pop at least one entry | |
3880 | |
3881 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
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3882 if (_cm->verbose_medium()) { |
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3883 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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3884 _worker_id, n); |
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3885 } |
342 | 3886 for (int i = 0; i < n; ++i) { |
3887 bool success = _task_queue->push(buffer[i]); | |
3888 // We only call this when the local queue is empty or under a | |
3889 // given target limit. So, we do not expect this push to fail. | |
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3890 assert(success, "invariant"); |
342 | 3891 } |
3892 | |
3893 statsOnly( int tmp_size = _task_queue->size(); | |
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3894 if (tmp_size > _local_max_size) { |
342 | 3895 _local_max_size = tmp_size; |
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3896 } |
342 | 3897 _local_pushes += n ); |
3898 } | |
3899 | |
3900 // this operation was quite expensive, so decrease the limits | |
3901 decrease_limits(); | |
3902 } | |
3903 | |
3904 void CMTask::drain_local_queue(bool partially) { | |
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3905 if (has_aborted()) return; |
342 | 3906 |
3907 // Decide what the target size is, depending whether we're going to | |
3908 // drain it partially (so that other tasks can steal if they run out | |
3909 // of things to do) or totally (at the very end). | |
3910 size_t target_size; | |
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3911 if (partially) { |
342 | 3912 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
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3913 } else { |
342 | 3914 target_size = 0; |
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3915 } |
342 | 3916 |
3917 if (_task_queue->size() > target_size) { | |
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3918 if (_cm->verbose_high()) { |
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3919 gclog_or_tty->print_cr("[%u] draining local queue, target size = " SIZE_FORMAT, |
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3920 _worker_id, target_size); |
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3921 } |
342 | 3922 |
3923 oop obj; | |
3924 bool ret = _task_queue->pop_local(obj); | |
3925 while (ret) { | |
3926 statsOnly( ++_local_pops ); | |
3927 | |
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3928 if (_cm->verbose_high()) { |
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3929 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
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3930 p2i((void*) obj)); |
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3931 } |
342 | 3932 |
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3933 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3934 assert(!_g1h->is_on_master_free_list( |
2152 | 3935 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3936 |
3937 scan_object(obj); | |
3938 | |
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3939 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3940 ret = false; |
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3941 } else { |
342 | 3942 ret = _task_queue->pop_local(obj); |
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3943 } |
342 | 3944 } |
3945 | |
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3946 if (_cm->verbose_high()) { |
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3947 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
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3948 _worker_id, _task_queue->size()); |
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3949 } |
342 | 3950 } |
3951 } | |
3952 | |
3953 void CMTask::drain_global_stack(bool partially) { | |
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3954 if (has_aborted()) return; |
342 | 3955 |
3956 // We have a policy to drain the local queue before we attempt to | |
3957 // drain the global stack. | |
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3958 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3959 |
3960 // Decide what the target size is, depending whether we're going to | |
3961 // drain it partially (so that other tasks can steal if they run out | |
3962 // of things to do) or totally (at the very end). Notice that, | |
3963 // because we move entries from the global stack in chunks or | |
3964 // because another task might be doing the same, we might in fact | |
3965 // drop below the target. But, this is not a problem. | |
3966 size_t target_size; | |
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3967 if (partially) { |
342 | 3968 target_size = _cm->partial_mark_stack_size_target(); |
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3969 } else { |
342 | 3970 target_size = 0; |
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3971 } |
342 | 3972 |
3973 if (_cm->mark_stack_size() > target_size) { | |
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3974 if (_cm->verbose_low()) { |
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3975 gclog_or_tty->print_cr("[%u] draining global_stack, target size " SIZE_FORMAT, |
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3976 _worker_id, target_size); |
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3977 } |
342 | 3978 |
3979 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3980 get_entries_from_global_stack(); | |
3981 drain_local_queue(partially); | |
3982 } | |
3983 | |
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3984 if (_cm->verbose_low()) { |
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3985 gclog_or_tty->print_cr("[%u] drained global stack, size = " SIZE_FORMAT, |
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3986 _worker_id, _cm->mark_stack_size()); |
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3987 } |
342 | 3988 } |
3989 } | |
3990 | |
3991 // SATB Queue has several assumptions on whether to call the par or | |
3992 // non-par versions of the methods. this is why some of the code is | |
3993 // replicated. We should really get rid of the single-threaded version | |
3994 // of the code to simplify things. | |
3995 void CMTask::drain_satb_buffers() { | |
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3996 if (has_aborted()) return; |
342 | 3997 |
3998 // We set this so that the regular clock knows that we're in the | |
3999 // middle of draining buffers and doesn't set the abort flag when it | |
4000 // notices that SATB buffers are available for draining. It'd be | |
4001 // very counter productive if it did that. :-) | |
4002 _draining_satb_buffers = true; | |
4003 | |
4004 CMObjectClosure oc(this); | |
4005 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
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4006 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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4007 satb_mq_set.set_par_closure(_worker_id, &oc); |
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4008 } else { |
342 | 4009 satb_mq_set.set_closure(&oc); |
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4010 } |
342 | 4011 |
4012 // This keeps claiming and applying the closure to completed buffers | |
4013 // until we run out of buffers or we need to abort. | |
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4014 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4015 while (!has_aborted() && |
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4016 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
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4017 if (_cm->verbose_medium()) { |
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4018 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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4019 } |
342 | 4020 statsOnly( ++_satb_buffers_processed ); |
4021 regular_clock_call(); | |
4022 } | |
4023 } else { | |
4024 while (!has_aborted() && | |
4025 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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4026 if (_cm->verbose_medium()) { |
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4027 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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4028 } |
342 | 4029 statsOnly( ++_satb_buffers_processed ); |
4030 regular_clock_call(); | |
4031 } | |
4032 } | |
4033 | |
4034 _draining_satb_buffers = false; | |
4035 | |
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4036 assert(has_aborted() || |
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4037 concurrent() || |
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4038 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 4039 |
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4040 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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4041 satb_mq_set.set_par_closure(_worker_id, NULL); |
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4042 } else { |
342 | 4043 satb_mq_set.set_closure(NULL); |
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4044 } |
342 | 4045 |
4046 // again, this was a potentially expensive operation, decrease the | |
4047 // limits to get the regular clock call early | |
4048 decrease_limits(); | |
4049 } | |
4050 | |
4051 void CMTask::print_stats() { | |
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4052 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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4053 _worker_id, _calls); |
342 | 4054 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
4055 _elapsed_time_ms, _termination_time_ms); | |
4056 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4057 _step_times_ms.num(), _step_times_ms.avg(), | |
4058 _step_times_ms.sd()); | |
4059 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4060 _step_times_ms.maximum(), _step_times_ms.sum()); | |
4061 | |
4062 #if _MARKING_STATS_ | |
4063 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4064 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
4065 _all_clock_intervals_ms.sd()); | |
4066 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4067 _all_clock_intervals_ms.maximum(), | |
4068 _all_clock_intervals_ms.sum()); | |
4069 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
4070 _clock_due_to_scanning, _clock_due_to_marking); | |
4071 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
4072 _objs_scanned, _objs_found_on_bitmap); | |
4073 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
4074 _local_pushes, _local_pops, _local_max_size); | |
4075 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
4076 _global_pushes, _global_pops, _global_max_size); | |
4077 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
4078 _global_transfers_to,_global_transfers_from); | |
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4079 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 4080 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
4081 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
4082 _steal_attempts, _steals); | |
4083 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
4084 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
4085 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
4086 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
4087 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
4088 #endif // _MARKING_STATS_ | |
4089 } | |
4090 | |
4091 /***************************************************************************** | |
4092 | |
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4093 The do_marking_step(time_target_ms, ...) method is the building |
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4094 block of the parallel marking framework. It can be called in parallel |
342 | 4095 with other invocations of do_marking_step() on different tasks |
4096 (but only one per task, obviously) and concurrently with the | |
4097 mutator threads, or during remark, hence it eliminates the need | |
4098 for two versions of the code. When called during remark, it will | |
4099 pick up from where the task left off during the concurrent marking | |
4100 phase. Interestingly, tasks are also claimable during evacuation | |
4101 pauses too, since do_marking_step() ensures that it aborts before | |
4102 it needs to yield. | |
4103 | |
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4104 The data structures that it uses to do marking work are the |
342 | 4105 following: |
4106 | |
4107 (1) Marking Bitmap. If there are gray objects that appear only | |
4108 on the bitmap (this happens either when dealing with an overflow | |
4109 or when the initial marking phase has simply marked the roots | |
4110 and didn't push them on the stack), then tasks claim heap | |
4111 regions whose bitmap they then scan to find gray objects. A | |
4112 global finger indicates where the end of the last claimed region | |
4113 is. A local finger indicates how far into the region a task has | |
4114 scanned. The two fingers are used to determine how to gray an | |
4115 object (i.e. whether simply marking it is OK, as it will be | |
4116 visited by a task in the future, or whether it needs to be also | |
4117 pushed on a stack). | |
4118 | |
4119 (2) Local Queue. The local queue of the task which is accessed | |
4120 reasonably efficiently by the task. Other tasks can steal from | |
4121 it when they run out of work. Throughout the marking phase, a | |
4122 task attempts to keep its local queue short but not totally | |
4123 empty, so that entries are available for stealing by other | |
4124 tasks. Only when there is no more work, a task will totally | |
4125 drain its local queue. | |
4126 | |
4127 (3) Global Mark Stack. This handles local queue overflow. During | |
4128 marking only sets of entries are moved between it and the local | |
4129 queues, as access to it requires a mutex and more fine-grain | |
4130 interaction with it which might cause contention. If it | |
4131 overflows, then the marking phase should restart and iterate | |
4132 over the bitmap to identify gray objects. Throughout the marking | |
4133 phase, tasks attempt to keep the global mark stack at a small | |
4134 length but not totally empty, so that entries are available for | |
4135 popping by other tasks. Only when there is no more work, tasks | |
4136 will totally drain the global mark stack. | |
4137 | |
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4138 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 4139 made available. Buffers are regularly removed from this queue |
4140 and scanned for roots, so that the queue doesn't get too | |
4141 long. During remark, all completed buffers are processed, as | |
4142 well as the filled in parts of any uncompleted buffers. | |
4143 | |
4144 The do_marking_step() method tries to abort when the time target | |
4145 has been reached. There are a few other cases when the | |
4146 do_marking_step() method also aborts: | |
4147 | |
4148 (1) When the marking phase has been aborted (after a Full GC). | |
4149 | |
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4150 (2) When a global overflow (on the global stack) has been |
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4151 triggered. Before the task aborts, it will actually sync up with |
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4152 the other tasks to ensure that all the marking data structures |
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4153 (local queues, stacks, fingers etc.) are re-initialized so that |
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4154 when do_marking_step() completes, the marking phase can |
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4155 immediately restart. |
342 | 4156 |
4157 (3) When enough completed SATB buffers are available. The | |
4158 do_marking_step() method only tries to drain SATB buffers right | |
4159 at the beginning. So, if enough buffers are available, the | |
4160 marking step aborts and the SATB buffers are processed at | |
4161 the beginning of the next invocation. | |
4162 | |
4163 (4) To yield. when we have to yield then we abort and yield | |
4164 right at the end of do_marking_step(). This saves us from a lot | |
4165 of hassle as, by yielding we might allow a Full GC. If this | |
4166 happens then objects will be compacted underneath our feet, the | |
4167 heap might shrink, etc. We save checking for this by just | |
4168 aborting and doing the yield right at the end. | |
4169 | |
4170 From the above it follows that the do_marking_step() method should | |
4171 be called in a loop (or, otherwise, regularly) until it completes. | |
4172 | |
4173 If a marking step completes without its has_aborted() flag being | |
4174 true, it means it has completed the current marking phase (and | |
4175 also all other marking tasks have done so and have all synced up). | |
4176 | |
4177 A method called regular_clock_call() is invoked "regularly" (in | |
4178 sub ms intervals) throughout marking. It is this clock method that | |
4179 checks all the abort conditions which were mentioned above and | |
4180 decides when the task should abort. A work-based scheme is used to | |
4181 trigger this clock method: when the number of object words the | |
4182 marking phase has scanned or the number of references the marking | |
4183 phase has visited reach a given limit. Additional invocations to | |
4184 the method clock have been planted in a few other strategic places | |
4185 too. The initial reason for the clock method was to avoid calling | |
4186 vtime too regularly, as it is quite expensive. So, once it was in | |
4187 place, it was natural to piggy-back all the other conditions on it | |
4188 too and not constantly check them throughout the code. | |
4189 | |
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4190 If do_termination is true then do_marking_step will enter its |
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4191 termination protocol. |
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4192 |
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4193 The value of is_serial must be true when do_marking_step is being |
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4194 called serially (i.e. by the VMThread) and do_marking_step should |
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4195 skip any synchronization in the termination and overflow code. |
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4196 Examples include the serial remark code and the serial reference |
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4197 processing closures. |
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4198 |
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4199 The value of is_serial must be false when do_marking_step is |
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4200 being called by any of the worker threads in a work gang. |
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4201 Examples include the concurrent marking code (CMMarkingTask), |
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4202 the MT remark code, and the MT reference processing closures. |
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4203 |
342 | 4204 *****************************************************************************/ |
4205 | |
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4206 void CMTask::do_marking_step(double time_target_ms, |
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4207 bool do_termination, |
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4208 bool is_serial) { |
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4209 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4210 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4211 |
342 | 4212 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
1023
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4213 assert(_task_queues != NULL, "invariant"); |
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4214 assert(_task_queue != NULL, "invariant"); |
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4215 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
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4216 |
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4217 assert(!_claimed, |
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4218 "only one thread should claim this task at any one time"); |
342 | 4219 |
4220 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4221 // possible for two threads to set the _claimed flag at the same | |
4222 // time. But it is only for debugging purposes anyway and it will | |
4223 // catch most problems. | |
4224 _claimed = true; | |
4225 | |
4226 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4227 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4228 | |
8787
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4229 // If do_stealing is true then do_marking_step will attempt to |
fa08949fe0cb
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4230 // steal work from the other CMTasks. It only makes sense to |
fa08949fe0cb
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|
4231 // enable stealing when the termination protocol is enabled |
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4232 // and do_marking_step() is not being called serially. |
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4233 bool do_stealing = do_termination && !is_serial; |
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4234 |
342 | 4235 double diff_prediction_ms = |
4236 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4237 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4238 | |
4239 // set up the variables that are used in the work-based scheme to | |
4240 // call the regular clock method | |
4241 _words_scanned = 0; | |
4242 _refs_reached = 0; | |
4243 recalculate_limits(); | |
4244 | |
4245 // clear all flags | |
4246 clear_has_aborted(); | |
2174
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4247 _has_timed_out = false; |
342 | 4248 _draining_satb_buffers = false; |
4249 | |
4250 ++_calls; | |
4251 | |
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4252 if (_cm->verbose_low()) { |
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4253 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 4254 "target = %1.2lfms >>>>>>>>>>", |
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4255 _worker_id, _calls, _time_target_ms); |
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4256 } |
342 | 4257 |
4258 // Set up the bitmap and oop closures. Anything that uses them is | |
4259 // eventually called from this method, so it is OK to allocate these | |
4260 // statically. | |
4261 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4262 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4263 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4264 |
4265 if (_cm->has_overflown()) { | |
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4266 // This can happen if the mark stack overflows during a GC pause |
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4267 // and this task, after a yield point, restarts. We have to abort |
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4268 // as we need to get into the overflow protocol which happens |
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|
4269 // right at the end of this task. |
342 | 4270 set_has_aborted(); |
4271 } | |
4272 | |
4273 // First drain any available SATB buffers. After this, we will not | |
4274 // look at SATB buffers before the next invocation of this method. | |
4275 // If enough completed SATB buffers are queued up, the regular clock | |
4276 // will abort this task so that it restarts. | |
4277 drain_satb_buffers(); | |
4278 // ...then partially drain the local queue and the global stack | |
4279 drain_local_queue(true); | |
4280 drain_global_stack(true); | |
4281 | |
4282 do { | |
4283 if (!has_aborted() && _curr_region != NULL) { | |
4284 // This means that we're already holding on to a region. | |
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4285 assert(_finger != NULL, "if region is not NULL, then the finger " |
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4286 "should not be NULL either"); |
342 | 4287 |
4288 // We might have restarted this task after an evacuation pause | |
4289 // which might have evacuated the region we're holding on to | |
4290 // underneath our feet. Let's read its limit again to make sure | |
4291 // that we do not iterate over a region of the heap that | |
4292 // contains garbage (update_region_limit() will also move | |
4293 // _finger to the start of the region if it is found empty). | |
4294 update_region_limit(); | |
4295 // We will start from _finger not from the start of the region, | |
4296 // as we might be restarting this task after aborting half-way | |
4297 // through scanning this region. In this case, _finger points to | |
4298 // the address where we last found a marked object. If this is a | |
4299 // fresh region, _finger points to start(). | |
4300 MemRegion mr = MemRegion(_finger, _region_limit); | |
4301 | |
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4302 if (_cm->verbose_low()) { |
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4303 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4304 "["PTR_FORMAT", "PTR_FORMAT") " |
8039
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|
4305 "of region "HR_FORMAT, |
17937
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4306 _worker_id, p2i(_finger), p2i(_region_limit), |
8039
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|
4307 HR_FORMAT_PARAMS(_curr_region)); |
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4308 } |
342 | 4309 |
8039
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4310 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
5e401ef52ec0
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|
4311 "humongous regions should go around loop once only"); |
5e401ef52ec0
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4312 |
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4313 // Some special cases: |
5e401ef52ec0
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4314 // If the memory region is empty, we can just give up the region. |
5e401ef52ec0
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|
4315 // If the current region is humongous then we only need to check |
5e401ef52ec0
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|
4316 // the bitmap for the bit associated with the start of the object, |
5e401ef52ec0
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|
4317 // scan the object if it's live, and give up the region. |
5e401ef52ec0
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4318 // Otherwise, let's iterate over the bitmap of the part of the region |
5e401ef52ec0
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|
4319 // that is left. |
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7052429: G1: Avoid unnecessary scanning of humongous regions during concurrent marking
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|
4320 // If the iteration is successful, give up the region. |
8039
5e401ef52ec0
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|
4321 if (mr.is_empty()) { |
5e401ef52ec0
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|
4322 giveup_current_region(); |
5e401ef52ec0
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|
4323 regular_clock_call(); |
5e401ef52ec0
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|
4324 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
5e401ef52ec0
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|
4325 if (_nextMarkBitMap->isMarked(mr.start())) { |
5e401ef52ec0
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|
4326 // The object is marked - apply the closure |
5e401ef52ec0
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|
4327 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(mr.start()); |
5e401ef52ec0
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|
4328 bitmap_closure.do_bit(offset); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4329 } |
5e401ef52ec0
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|
4330 // Even if this task aborted while scanning the humongous object |
5e401ef52ec0
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|
4331 // we can (and should) give up the current region. |
5e401ef52ec0
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|
4332 giveup_current_region(); |
5e401ef52ec0
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|
4333 regular_clock_call(); |
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|
4334 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4335 giveup_current_region(); |
4336 regular_clock_call(); | |
4337 } else { | |
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|
4338 assert(has_aborted(), "currently the only way to do so"); |
342 | 4339 // The only way to abort the bitmap iteration is to return |
4340 // false from the do_bit() method. However, inside the | |
4341 // do_bit() method we move the _finger to point to the | |
4342 // object currently being looked at. So, if we bail out, we | |
4343 // have definitely set _finger to something non-null. | |
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|
4344 assert(_finger != NULL, "invariant"); |
342 | 4345 |
4346 // Region iteration was actually aborted. So now _finger | |
4347 // points to the address of the object we last scanned. If we | |
4348 // leave it there, when we restart this task, we will rescan | |
4349 // the object. It is easy to avoid this. We move the finger by | |
4350 // enough to point to the next possible object header (the | |
4351 // bitmap knows by how much we need to move it as it knows its | |
4352 // granularity). | |
1314
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|
4353 assert(_finger < _region_limit, "invariant"); |
8733
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|
4354 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
1314
3f0549ed0c98
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|
4355 // Check if bitmap iteration was aborted while scanning the last object |
3f0549ed0c98
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|
4356 if (new_finger >= _region_limit) { |
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|
4357 giveup_current_region(); |
1314
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|
4358 } else { |
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|
4359 move_finger_to(new_finger); |
1314
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|
4360 } |
342 | 4361 } |
4362 } | |
4363 // At this point we have either completed iterating over the | |
4364 // region we were holding on to, or we have aborted. | |
4365 | |
4366 // We then partially drain the local queue and the global stack. | |
4367 // (Do we really need this?) | |
4368 drain_local_queue(true); | |
4369 drain_global_stack(true); | |
4370 | |
4371 // Read the note on the claim_region() method on why it might | |
4372 // return NULL with potentially more regions available for | |
4373 // claiming and why we have to check out_of_regions() to determine | |
4374 // whether we're done or not. | |
4375 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4376 // We are going to try to claim a new region. We should have | |
4377 // given up on the previous one. | |
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4378 // Separated the asserts so that we know which one fires. |
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|
4379 assert(_curr_region == NULL, "invariant"); |
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|
4380 assert(_finger == NULL, "invariant"); |
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|
4381 assert(_region_limit == NULL, "invariant"); |
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|
4382 if (_cm->verbose_low()) { |
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4383 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
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|
4384 } |
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|
4385 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4386 if (claimed_region != NULL) { |
4387 // Yes, we managed to claim one | |
4388 statsOnly( ++_regions_claimed ); | |
4389 | |
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|
4390 if (_cm->verbose_low()) { |
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4391 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4392 "region "PTR_FORMAT, |
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4393 _worker_id, p2i(claimed_region)); |
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|
4394 } |
342 | 4395 |
4396 setup_for_region(claimed_region); | |
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4397 assert(_curr_region == claimed_region, "invariant"); |
342 | 4398 } |
4399 // It is important to call the regular clock here. It might take | |
4400 // a while to claim a region if, for example, we hit a large | |
4401 // block of empty regions. So we need to call the regular clock | |
4402 // method once round the loop to make sure it's called | |
4403 // frequently enough. | |
4404 regular_clock_call(); | |
4405 } | |
4406 | |
4407 if (!has_aborted() && _curr_region == NULL) { | |
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|
4408 assert(_cm->out_of_regions(), |
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4409 "at this point we should be out of regions"); |
342 | 4410 } |
4411 } while ( _curr_region != NULL && !has_aborted()); | |
4412 | |
4413 if (!has_aborted()) { | |
4414 // We cannot check whether the global stack is empty, since other | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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4837
diff
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|
4415 // tasks might be pushing objects to it concurrently. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4416 assert(_cm->out_of_regions(), |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
changeset
|
4417 "at this point we should be out of regions"); |
342 | 4418 |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
4419 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4420 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
changeset
|
4421 } |
342 | 4422 |
4423 // Try to reduce the number of available SATB buffers so that | |
4424 // remark has less work to do. | |
4425 drain_satb_buffers(); | |
4426 } | |
4427 | |
4428 // Since we've done everything else, we can now totally drain the | |
4429 // local queue and global stack. | |
4430 drain_local_queue(false); | |
4431 drain_global_stack(false); | |
4432 | |
4433 // Attempt at work stealing from other task's queues. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
4434 if (do_stealing && !has_aborted()) { |
342 | 4435 // We have not aborted. This means that we have finished all that |
4436 // we could. Let's try to do some stealing... | |
4437 | |
4438 // We cannot check whether the global stack is empty, since other | |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
changeset
|
4439 // tasks might be pushing objects to it concurrently. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4440 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4441 "only way to reach here"); |
342 | 4442 |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
4443 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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diff
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|
4444 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
4445 } |
342 | 4446 |
4447 while (!has_aborted()) { | |
4448 oop obj; | |
4449 statsOnly( ++_steal_attempts ); | |
4450 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4451 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
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|
4452 if (_cm->verbose_medium()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4453 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4454 _worker_id, p2i((void*) obj)); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
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|
4455 } |
342 | 4456 |
4457 statsOnly( ++_steals ); | |
4458 | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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1022
diff
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|
4459 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4460 "any stolen object should be marked"); |
342 | 4461 scan_object(obj); |
4462 | |
4463 // And since we're towards the end, let's totally drain the | |
4464 // local queue and global stack. | |
4465 drain_local_queue(false); | |
4466 drain_global_stack(false); | |
4467 } else { | |
4468 break; | |
4469 } | |
4470 } | |
4471 } | |
4472 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4473 // If we are about to wrap up and go into termination, check if we |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4474 // should raise the overflow flag. |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4475 if (do_termination && !has_aborted()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4476 if (_cm->force_overflow()->should_force()) { |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4477 _cm->set_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
|
4478 regular_clock_call(); |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4479 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4480 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4481 |
342 | 4482 // We still haven't aborted. Now, let's try to get into the |
4483 // termination protocol. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
4484 if (do_termination && !has_aborted()) { |
342 | 4485 // We cannot check whether the global stack is empty, since other |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
changeset
|
4486 // tasks might be concurrently pushing objects on it. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4487 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4488 assert(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4489 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4490 |
3776
23d434c6290d
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parents:
3772
diff
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|
4491 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
6812
diff
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|
4492 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4493 } |
342 | 4494 |
4495 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
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|
4496 |
342 | 4497 // The CMTask class also extends the TerminatorTerminator class, |
4498 // hence its should_exit_termination() method will also decide | |
4499 // whether to exit the termination protocol or not. | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4500 bool finished = (is_serial || |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4501 _cm->terminator()->offer_termination(this)); |
342 | 4502 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
4503 _termination_time_ms += | |
4504 termination_end_time_ms - _termination_start_time_ms; | |
4505 | |
4506 if (finished) { | |
4507 // We're all done. | |
4508 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
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|
4509 if (_worker_id == 0) { |
342 | 4510 // let's allow task 0 to do this |
4511 if (concurrent()) { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4512 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4513 // we need to set this to false before the next |
4514 // safepoint. This way we ensure that the marking phase | |
4515 // doesn't observe any more heap expansions. | |
4516 _cm->clear_concurrent_marking_in_progress(); | |
4517 } | |
4518 } | |
4519 | |
4520 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4521 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4522 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4523 // which one. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4524 guarantee(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4525 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4526 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4527 guarantee(!_cm->has_overflown(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4528 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4529 |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
changeset
|
4530 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4531 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
3776
23d434c6290d
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parents:
3772
diff
changeset
|
4532 } |
342 | 4533 } else { |
4534 // Apparently there's more work to do. Let's abort this task. It | |
4535 // will restart it and we can hopefully find more things to do. | |
4536 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4537 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4538 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4539 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4540 } |
342 | 4541 |
4542 set_has_aborted(); | |
4543 statsOnly( ++_aborted_termination ); | |
4544 } | |
4545 } | |
4546 | |
4547 // Mainly for debugging purposes to make sure that a pointer to the | |
4548 // closure which was statically allocated in this frame doesn't | |
4549 // escape it by accident. | |
3771 | 4550 set_cm_oop_closure(NULL); |
342 | 4551 double end_time_ms = os::elapsedVTime() * 1000.0; |
4552 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4553 // Update the step history. | |
4554 _step_times_ms.add(elapsed_time_ms); | |
4555 | |
4556 if (has_aborted()) { | |
4557 // The task was aborted for some reason. | |
4558 | |
4559 statsOnly( ++_aborted ); | |
4560 | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4561 if (_has_timed_out) { |
342 | 4562 double diff_ms = elapsed_time_ms - _time_target_ms; |
4563 // Keep statistics of how well we did with respect to hitting | |
4564 // our target only if we actually timed out (if we aborted for | |
4565 // other reasons, then the results might get skewed). | |
4566 _marking_step_diffs_ms.add(diff_ms); | |
4567 } | |
4568 | |
4569 if (_cm->has_overflown()) { | |
4570 // This is the interesting one. We aborted because a global | |
4571 // overflow was raised. This means we have to restart the | |
4572 // marking phase and start iterating over regions. However, in | |
4573 // order to do this we have to make sure that all tasks stop | |
4574 // what they are doing and re-initialise in a safe manner. We | |
4575 // will achieve this with the use of two barrier sync points. | |
4576 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4577 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4578 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4579 } |
342 | 4580 |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4581 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4582 // We only need to enter the sync barrier if being called |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4583 // from a parallel context |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4584 _cm->enter_first_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4585 |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4586 // When we exit this sync barrier we know that all tasks have |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4587 // stopped doing marking work. So, it's now safe to |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4588 // re-initialise our data structures. At the end of this method, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4589 // task 0 will clear the global data structures. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4590 } |
342 | 4591 |
4592 statsOnly( ++_aborted_overflow ); | |
4593 | |
4594 // We clear the local state of this task... | |
4595 clear_region_fields(); | |
4596 | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4597 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4598 // ...and enter the second barrier. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4599 _cm->enter_second_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4600 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4601 // At this point, if we're during the concurrent phase of |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4602 // marking, everything has been re-initialized and we're |
342 | 4603 // ready to restart. |
4604 } | |
4605 | |
4606 if (_cm->verbose_low()) { | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4607 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4608 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4609 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4610 if (_cm->has_aborted()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4611 gclog_or_tty->print_cr("[%u] ========== MARKING ABORTED ==========", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4612 _worker_id); |
3776
23d434c6290d
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3772
diff
changeset
|
4613 } |
342 | 4614 } |
4615 } else { | |
3776
23d434c6290d
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tonyp
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3772
diff
changeset
|
4616 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4617 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4618 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4619 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
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tonyp
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3772
diff
changeset
|
4620 } |
342 | 4621 } |
4622 | |
4623 _claimed = false; | |
4624 } | |
4625 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4626 CMTask::CMTask(uint worker_id, |
342 | 4627 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4628 size_t* marked_bytes, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4629 BitMap* card_bm, |
342 | 4630 CMTaskQueue* task_queue, |
4631 CMTaskQueueSet* task_queues) | |
4632 : _g1h(G1CollectedHeap::heap()), | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4633 _worker_id(worker_id), _cm(cm), |
342 | 4634 _claimed(false), |
4635 _nextMarkBitMap(NULL), _hash_seed(17), | |
4636 _task_queue(task_queue), | |
4637 _task_queues(task_queues), | |
3771 | 4638 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4639 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4640 _card_bm(card_bm) { |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4641 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4642 guarantee(task_queues != NULL, "invariant"); |
342 | 4643 |
4644 statsOnly( _clock_due_to_scanning = 0; | |
4645 _clock_due_to_marking = 0 ); | |
4646 | |
4647 _marking_step_diffs_ms.add(0.5); | |
4648 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4649 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4650 // These are formatting macros that are used below to ensure |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4651 // consistent formatting. The *_H_* versions are used to format the |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4652 // header for a particular value and they should be kept consistent |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4653 // with the corresponding macro. Also note that most of the macros add |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4654 // the necessary white space (as a prefix) which makes them a bit |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4655 // easier to compose. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4656 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4657 // All the output lines are prefixed with this string to be able to |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4658 // identify them easily in a large log file. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4659 #define G1PPRL_LINE_PREFIX "###" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4660 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4661 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4662 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4663 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4664 #else // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4665 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4666 #endif // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4667 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4668 // For per-region info |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4669 #define G1PPRL_TYPE_FORMAT " %-4s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4670 #define G1PPRL_TYPE_H_FORMAT " %4s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4671 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4672 #define G1PPRL_BYTE_H_FORMAT " %9s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4673 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4674 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4675 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4676 // For summary info |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4677 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4678 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4679 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4680 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4681 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4682 G1PrintRegionLivenessInfoClosure:: |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4683 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4684 : _out(out), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4685 _total_used_bytes(0), _total_capacity_bytes(0), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4686 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4687 _hum_used_bytes(0), _hum_capacity_bytes(0), |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4688 _hum_prev_live_bytes(0), _hum_next_live_bytes(0), |
12080 | 4689 _total_remset_bytes(0), _total_strong_code_roots_bytes(0) { |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4690 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4691 MemRegion g1_reserved = g1h->g1_reserved(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4692 double now = os::elapsedTime(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4693 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4694 // Print the header of the output. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4695 _out->cr(); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4696 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4697 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4698 G1PPRL_SUM_ADDR_FORMAT("reserved") |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4699 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4700 p2i(g1_reserved.start()), p2i(g1_reserved.end()), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4701 HeapRegion::GrainBytes); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4702 _out->print_cr(G1PPRL_LINE_PREFIX); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4703 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4704 G1PPRL_TYPE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4705 G1PPRL_ADDR_BASE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4706 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4707 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4708 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4709 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4710 G1PPRL_BYTE_H_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4711 G1PPRL_BYTE_H_FORMAT, |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4712 "type", "address-range", |
12080 | 4713 "used", "prev-live", "next-live", "gc-eff", |
4714 "remset", "code-roots"); | |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4715 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4716 G1PPRL_TYPE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4717 G1PPRL_ADDR_BASE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4718 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4719 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4720 G1PPRL_BYTE_H_FORMAT |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4721 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4722 G1PPRL_BYTE_H_FORMAT |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4723 G1PPRL_BYTE_H_FORMAT, |
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4724 "", "", |
12080 | 4725 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)", |
4726 "(bytes)", "(bytes)"); | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4727 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4728 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4729 // It takes as a parameter a reference to one of the _hum_* fields, it |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4730 // deduces the corresponding value for a region in a humongous region |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4731 // series (either the region size, or what's left if the _hum_* field |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4732 // is < the region size), and updates the _hum_* field accordingly. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4733 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4734 size_t bytes = 0; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4735 // The > 0 check is to deal with the prev and next live bytes which |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4736 // could be 0. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4737 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4738 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4739 *hum_bytes -= bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4740 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4741 return bytes; |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4742 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4743 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4744 // It deduces the values for a region in a humongous region series |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4745 // from the _hum_* fields and updates those accordingly. It assumes |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4746 // that that _hum_* fields have already been set up from the "starts |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4747 // humongous" region and we visit the regions in address order. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4748 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4749 size_t* capacity_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4750 size_t* prev_live_bytes, |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4751 size_t* next_live_bytes) { |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4752 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
4753 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4754 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4755 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4756 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
4757 } |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4758 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4759 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
20481
c02ec279b062
8057768: Make heap region region type in G1 HeapRegion explicit
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20445
diff
changeset
|
4760 const char* type = r->get_type_str(); |
2435
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4761 HeapWord* bottom = r->bottom(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4762 HeapWord* end = r->end(); |
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|
4763 size_t capacity_bytes = r->capacity(); |
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|
4764 size_t used_bytes = r->used(); |
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|
4765 size_t prev_live_bytes = r->live_bytes(); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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4766 size_t next_live_bytes = r->next_live_bytes(); |
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4767 double gc_eff = r->gc_efficiency(); |
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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diff
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|
4768 size_t remset_bytes = r->rem_set()->mem_size(); |
12080 | 4769 size_t strong_code_roots_bytes = r->rem_set()->strong_code_roots_mem_size(); |
4770 | |
20481
c02ec279b062
8057768: Make heap region region type in G1 HeapRegion explicit
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|
4771 if (r->startsHumongous()) { |
2435
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4772 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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4773 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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4774 "they should have been zeroed after the last time we used them"); |
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4775 // Set up the _hum_* fields. |
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4776 _hum_capacity_bytes = capacity_bytes; |
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4777 _hum_used_bytes = used_bytes; |
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4778 _hum_prev_live_bytes = prev_live_bytes; |
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4779 _hum_next_live_bytes = next_live_bytes; |
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4780 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4781 &prev_live_bytes, &next_live_bytes); |
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4782 end = bottom + HeapRegion::GrainWords; |
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4783 } else if (r->continuesHumongous()) { |
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|
4784 get_hum_bytes(&used_bytes, &capacity_bytes, |
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|
4785 &prev_live_bytes, &next_live_bytes); |
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|
4786 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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|
4787 } |
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|
4788 |
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|
4789 _total_used_bytes += used_bytes; |
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4790 _total_capacity_bytes += capacity_bytes; |
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4791 _total_prev_live_bytes += prev_live_bytes; |
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4792 _total_next_live_bytes += next_live_bytes; |
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|
4793 _total_remset_bytes += remset_bytes; |
12080 | 4794 _total_strong_code_roots_bytes += strong_code_roots_bytes; |
2435
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|
4795 |
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|
4796 // Print a line for this particular region. |
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|
4797 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4798 G1PPRL_TYPE_FORMAT |
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diff
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|
4799 G1PPRL_ADDR_BASE_FORMAT |
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|
4800 G1PPRL_BYTE_FORMAT |
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|
4801 G1PPRL_BYTE_FORMAT |
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4802 G1PPRL_BYTE_FORMAT |
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|
4803 G1PPRL_DOUBLE_FORMAT |
12080 | 4804 G1PPRL_BYTE_FORMAT |
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|
4805 G1PPRL_BYTE_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
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17844
diff
changeset
|
4806 type, p2i(bottom), p2i(end), |
12080 | 4807 used_bytes, prev_live_bytes, next_live_bytes, gc_eff, |
4808 remset_bytes, strong_code_roots_bytes); | |
2435
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|
4809 |
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|
4810 return false; |
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|
4811 } |
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|
4812 |
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|
4813 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
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|
4814 // add static memory usages to remembered set sizes |
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|
4815 _total_remset_bytes += HeapRegionRemSet::fl_mem_size() + HeapRegionRemSet::static_mem_size(); |
2435
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diff
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4816 // Print the footer of the output. |
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|
4817 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4818 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4819 " SUMMARY" |
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|
4820 G1PPRL_SUM_MB_FORMAT("capacity") |
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|
4821 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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|
4822 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
10290
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|
4823 G1PPRL_SUM_MB_PERC_FORMAT("next-live") |
12080 | 4824 G1PPRL_SUM_MB_FORMAT("remset") |
4825 G1PPRL_SUM_MB_FORMAT("code-roots"), | |
2435
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diff
changeset
|
4826 bytes_to_mb(_total_capacity_bytes), |
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changeset
|
4827 bytes_to_mb(_total_used_bytes), |
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2369
diff
changeset
|
4828 perc(_total_used_bytes, _total_capacity_bytes), |
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diff
changeset
|
4829 bytes_to_mb(_total_prev_live_bytes), |
371bbc844bf1
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diff
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|
4830 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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diff
changeset
|
4831 bytes_to_mb(_total_next_live_bytes), |
10290
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8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
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10186
diff
changeset
|
4832 perc(_total_next_live_bytes, _total_capacity_bytes), |
12080 | 4833 bytes_to_mb(_total_remset_bytes), |
4834 bytes_to_mb(_total_strong_code_roots_bytes)); | |
2435
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4835 _out->cr(); |
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changeset
|
4836 } |