Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 20380:9337d0e7ea4f
8055919: Remove dead code in G1 concurrent marking code
Reviewed-by: jmasa, jwilhelm
author | tschatzl |
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date | Tue, 02 Sep 2014 15:04:00 +0200 |
parents | a8ea2f110d87 |
children | edb5f3b38aab |
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" |
26 #include "classfile/symbolTable.hpp" | |
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27 #include "code/codeCache.hpp" |
3771 | 28 #include "gc_implementation/g1/concurrentMark.inline.hpp" |
1972 | 29 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" |
30 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
31 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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32 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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33 #include "gc_implementation/g1/g1Log.hpp" |
3771 | 34 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
1972 | 35 #include "gc_implementation/g1/g1RemSet.hpp" |
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36 #include "gc_implementation/g1/heapRegion.inline.hpp" |
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37 #include "gc_implementation/g1/heapRegionManager.inline.hpp" |
1972 | 38 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
20337 | 39 #include "gc_implementation/g1/heapRegionSet.inline.hpp" |
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40 #include "gc_implementation/shared/vmGCOperations.hpp" |
10405 | 41 #include "gc_implementation/shared/gcTimer.hpp" |
42 #include "gc_implementation/shared/gcTrace.hpp" | |
43 #include "gc_implementation/shared/gcTraceTime.hpp" | |
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44 #include "memory/allocation.hpp" |
1972 | 45 #include "memory/genOopClosures.inline.hpp" |
46 #include "memory/referencePolicy.hpp" | |
47 #include "memory/resourceArea.hpp" | |
48 #include "oops/oop.inline.hpp" | |
49 #include "runtime/handles.inline.hpp" | |
50 #include "runtime/java.hpp" | |
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51 #include "runtime/prefetch.inline.hpp" |
6197 | 52 #include "services/memTracker.hpp" |
342 | 53 |
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54 // Concurrent marking bit map wrapper |
342 | 55 |
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56 CMBitMapRO::CMBitMapRO(int shifter) : |
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57 _bm(), |
342 | 58 _shifter(shifter) { |
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59 _bmStartWord = 0; |
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60 _bmWordSize = 0; |
342 | 61 } |
62 | |
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63 HeapWord* CMBitMapRO::getNextMarkedWordAddress(const HeapWord* addr, |
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64 const HeapWord* limit) const { |
342 | 65 // First we must round addr *up* to a possible object boundary. |
66 addr = (HeapWord*)align_size_up((intptr_t)addr, | |
67 HeapWordSize << _shifter); | |
68 size_t addrOffset = heapWordToOffset(addr); | |
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69 if (limit == NULL) { |
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70 limit = _bmStartWord + _bmWordSize; |
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71 } |
342 | 72 size_t limitOffset = heapWordToOffset(limit); |
73 size_t nextOffset = _bm.get_next_one_offset(addrOffset, limitOffset); | |
74 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
75 assert(nextAddr >= addr, "get_next_one postcondition"); | |
76 assert(nextAddr == limit || isMarked(nextAddr), | |
77 "get_next_one postcondition"); | |
78 return nextAddr; | |
79 } | |
80 | |
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81 HeapWord* CMBitMapRO::getNextUnmarkedWordAddress(const HeapWord* addr, |
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82 const HeapWord* limit) const { |
342 | 83 size_t addrOffset = heapWordToOffset(addr); |
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84 if (limit == NULL) { |
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85 limit = _bmStartWord + _bmWordSize; |
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86 } |
342 | 87 size_t limitOffset = heapWordToOffset(limit); |
88 size_t nextOffset = _bm.get_next_zero_offset(addrOffset, limitOffset); | |
89 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
90 assert(nextAddr >= addr, "get_next_one postcondition"); | |
91 assert(nextAddr == limit || !isMarked(nextAddr), | |
92 "get_next_one postcondition"); | |
93 return nextAddr; | |
94 } | |
95 | |
96 int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const { | |
97 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
98 return (int) (diff >> _shifter); | |
99 } | |
100 | |
101 #ifndef PRODUCT | |
20337 | 102 bool CMBitMapRO::covers(MemRegion heap_rs) const { |
342 | 103 // assert(_bm.map() == _virtual_space.low(), "map inconsistency"); |
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104 assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize, |
342 | 105 "size inconsistency"); |
20337 | 106 return _bmStartWord == (HeapWord*)(heap_rs.start()) && |
107 _bmWordSize == heap_rs.word_size(); | |
342 | 108 } |
109 #endif | |
110 | |
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111 void CMBitMapRO::print_on_error(outputStream* st, const char* prefix) const { |
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112 _bm.print_on_error(st, prefix); |
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113 } |
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114 |
20337 | 115 size_t CMBitMap::compute_size(size_t heap_size) { |
116 return heap_size / mark_distance(); | |
117 } | |
118 | |
119 size_t CMBitMap::mark_distance() { | |
120 return MinObjAlignmentInBytes * BitsPerByte; | |
121 } | |
122 | |
123 void CMBitMap::initialize(MemRegion heap, G1RegionToSpaceMapper* storage) { | |
124 _bmStartWord = heap.start(); | |
125 _bmWordSize = heap.word_size(); | |
126 | |
127 _bm.set_map((BitMap::bm_word_t*) storage->reserved().start()); | |
128 _bm.set_size(_bmWordSize >> _shifter); | |
129 | |
130 storage->set_mapping_changed_listener(&_listener); | |
131 } | |
132 | |
133 void CMBitMapMappingChangedListener::on_commit(uint start_region, size_t num_regions) { | |
134 // We need to clear the bitmap on commit, removing any existing information. | |
135 MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_region), num_regions * HeapRegion::GrainWords); | |
136 _bm->clearRange(mr); | |
137 } | |
138 | |
139 // Closure used for clearing the given mark bitmap. | |
140 class ClearBitmapHRClosure : public HeapRegionClosure { | |
141 private: | |
142 ConcurrentMark* _cm; | |
143 CMBitMap* _bitmap; | |
144 bool _may_yield; // The closure may yield during iteration. If yielded, abort the iteration. | |
145 public: | |
146 ClearBitmapHRClosure(ConcurrentMark* cm, CMBitMap* bitmap, bool may_yield) : HeapRegionClosure(), _cm(cm), _bitmap(bitmap), _may_yield(may_yield) { | |
147 assert(!may_yield || cm != NULL, "CM must be non-NULL if this closure is expected to yield."); | |
148 } | |
149 | |
150 virtual bool doHeapRegion(HeapRegion* r) { | |
151 size_t const chunk_size_in_words = M / HeapWordSize; | |
152 | |
153 HeapWord* cur = r->bottom(); | |
154 HeapWord* const end = r->end(); | |
155 | |
156 while (cur < end) { | |
157 MemRegion mr(cur, MIN2(cur + chunk_size_in_words, end)); | |
158 _bitmap->clearRange(mr); | |
159 | |
160 cur += chunk_size_in_words; | |
161 | |
162 // Abort iteration if after yielding the marking has been aborted. | |
163 if (_may_yield && _cm->do_yield_check() && _cm->has_aborted()) { | |
164 return true; | |
165 } | |
166 // Repeat the asserts from before the start of the closure. We will do them | |
167 // as asserts here to minimize their overhead on the product. However, we | |
168 // will have them as guarantees at the beginning / end of the bitmap | |
169 // clearing to get some checking in the product. | |
170 assert(!_may_yield || _cm->cmThread()->during_cycle(), "invariant"); | |
171 assert(!_may_yield || !G1CollectedHeap::heap()->mark_in_progress(), "invariant"); | |
172 } | |
173 | |
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174 return false; |
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175 } |
20337 | 176 }; |
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177 |
342 | 178 void CMBitMap::clearAll() { |
20337 | 179 ClearBitmapHRClosure cl(NULL, this, false /* may_yield */); |
180 G1CollectedHeap::heap()->heap_region_iterate(&cl); | |
181 guarantee(cl.complete(), "Must have completed iteration."); | |
342 | 182 return; |
183 } | |
184 | |
185 void CMBitMap::markRange(MemRegion mr) { | |
186 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
187 assert(!mr.is_empty(), "unexpected empty region"); | |
188 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
189 ((HeapWord *) mr.end())), | |
190 "markRange memory region end is not card aligned"); | |
191 // convert address range into offset range | |
192 _bm.at_put_range(heapWordToOffset(mr.start()), | |
193 heapWordToOffset(mr.end()), true); | |
194 } | |
195 | |
196 void CMBitMap::clearRange(MemRegion mr) { | |
197 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
198 assert(!mr.is_empty(), "unexpected empty region"); | |
199 // convert address range into offset range | |
200 _bm.at_put_range(heapWordToOffset(mr.start()), | |
201 heapWordToOffset(mr.end()), false); | |
202 } | |
203 | |
204 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
205 HeapWord* end_addr) { | |
206 HeapWord* start = getNextMarkedWordAddress(addr); | |
207 start = MIN2(start, end_addr); | |
208 HeapWord* end = getNextUnmarkedWordAddress(start); | |
209 end = MIN2(end, end_addr); | |
210 assert(start <= end, "Consistency check"); | |
211 MemRegion mr(start, end); | |
212 if (!mr.is_empty()) { | |
213 clearRange(mr); | |
214 } | |
215 return mr; | |
216 } | |
217 | |
218 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
219 _base(NULL), _cm(cm) | |
220 #ifdef ASSERT | |
221 , _drain_in_progress(false) | |
222 , _drain_in_progress_yields(false) | |
223 #endif | |
224 {} | |
225 | |
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226 bool CMMarkStack::allocate(size_t capacity) { |
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227 // allocate a stack of the requisite depth |
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228 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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229 if (!rs.is_reserved()) { |
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230 warning("ConcurrentMark MarkStack allocation failure"); |
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231 return false; |
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232 } |
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233 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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234 if (!_virtual_space.initialize(rs, rs.size())) { |
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235 warning("ConcurrentMark MarkStack backing store failure"); |
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236 // Release the virtual memory reserved for the marking stack |
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237 rs.release(); |
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238 return false; |
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239 } |
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240 assert(_virtual_space.committed_size() == rs.size(), |
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241 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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242 _base = (oop*) _virtual_space.low(); |
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243 setEmpty(); |
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244 _capacity = (jint) capacity; |
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245 _saved_index = -1; |
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246 _should_expand = false; |
342 | 247 NOT_PRODUCT(_max_depth = 0); |
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248 return true; |
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249 } |
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250 |
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251 void CMMarkStack::expand() { |
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252 // Called, during remark, if we've overflown the marking stack during marking. |
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253 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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254 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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255 // Clear expansion flag |
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256 _should_expand = false; |
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257 if (_capacity == (jint) MarkStackSizeMax) { |
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258 if (PrintGCDetails && Verbose) { |
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259 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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260 } |
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261 return; |
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262 } |
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263 // Double capacity if possible |
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264 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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265 // Do not give up existing stack until we have managed to |
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266 // get the double capacity that we desired. |
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267 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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268 sizeof(oop))); |
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269 if (rs.is_reserved()) { |
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270 // Release the backing store associated with old stack |
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271 _virtual_space.release(); |
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272 // Reinitialize virtual space for new stack |
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273 if (!_virtual_space.initialize(rs, rs.size())) { |
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274 fatal("Not enough swap for expanded marking stack capacity"); |
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275 } |
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276 _base = (oop*)(_virtual_space.low()); |
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277 _index = 0; |
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278 _capacity = new_capacity; |
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279 } else { |
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280 if (PrintGCDetails && Verbose) { |
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281 // Failed to double capacity, continue; |
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282 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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283 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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284 _capacity / K, new_capacity / K); |
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285 } |
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286 } |
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287 } |
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288 |
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289 void CMMarkStack::set_should_expand() { |
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290 // If we're resetting the marking state because of an |
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291 // marking stack overflow, record that we should, if |
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292 // possible, expand the stack. |
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293 _should_expand = _cm->has_overflown(); |
342 | 294 } |
295 | |
296 CMMarkStack::~CMMarkStack() { | |
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297 if (_base != NULL) { |
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298 _base = NULL; |
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299 _virtual_space.release(); |
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300 } |
342 | 301 } |
302 | |
303 void CMMarkStack::par_push(oop ptr) { | |
304 while (true) { | |
305 if (isFull()) { | |
306 _overflow = true; | |
307 return; | |
308 } | |
309 // Otherwise... | |
310 jint index = _index; | |
311 jint next_index = index+1; | |
312 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
313 if (res == index) { | |
314 _base[index] = ptr; | |
315 // Note that we don't maintain this atomically. We could, but it | |
316 // doesn't seem necessary. | |
317 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
318 return; | |
319 } | |
320 // Otherwise, we need to try again. | |
321 } | |
322 } | |
323 | |
324 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
325 while (true) { | |
326 if (isFull()) { | |
327 _overflow = true; | |
328 return; | |
329 } | |
330 // Otherwise... | |
331 jint index = _index; | |
332 jint next_index = index + n; | |
333 if (next_index > _capacity) { | |
334 _overflow = true; | |
335 return; | |
336 } | |
337 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
338 if (res == index) { | |
339 for (int i = 0; i < n; i++) { | |
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340 int ind = index + i; |
342 | 341 assert(ind < _capacity, "By overflow test above."); |
342 _base[ind] = ptr_arr[i]; | |
343 } | |
344 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
345 return; | |
346 } | |
347 // Otherwise, we need to try again. | |
348 } | |
349 } | |
350 | |
351 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
352 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
353 jint start = _index; | |
354 jint next_index = start + n; | |
355 if (next_index > _capacity) { | |
356 _overflow = true; | |
357 return; | |
358 } | |
359 // Otherwise. | |
360 _index = next_index; | |
361 for (int i = 0; i < n; i++) { | |
362 int ind = start + i; | |
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363 assert(ind < _capacity, "By overflow test above."); |
342 | 364 _base[ind] = ptr_arr[i]; |
365 } | |
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366 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
342 | 367 } |
368 | |
369 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
370 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
371 jint index = _index; | |
372 if (index == 0) { | |
373 *n = 0; | |
374 return false; | |
375 } else { | |
376 int k = MIN2(max, index); | |
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377 jint new_ind = index - k; |
342 | 378 for (int j = 0; j < k; j++) { |
379 ptr_arr[j] = _base[new_ind + j]; | |
380 } | |
381 _index = new_ind; | |
382 *n = k; | |
383 return true; | |
384 } | |
385 } | |
386 | |
387 template<class OopClosureClass> | |
388 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
389 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
390 || SafepointSynchronize::is_at_safepoint(), | |
391 "Drain recursion must be yield-safe."); | |
392 bool res = true; | |
393 debug_only(_drain_in_progress = true); | |
394 debug_only(_drain_in_progress_yields = yield_after); | |
395 while (!isEmpty()) { | |
396 oop newOop = pop(); | |
397 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
398 assert(newOop->is_oop(), "Expected an oop"); | |
399 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
400 "only grey objects on this stack"); | |
401 newOop->oop_iterate(cl); | |
402 if (yield_after && _cm->do_yield_check()) { | |
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403 res = false; |
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404 break; |
342 | 405 } |
406 } | |
407 debug_only(_drain_in_progress = false); | |
408 return res; | |
409 } | |
410 | |
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411 void CMMarkStack::note_start_of_gc() { |
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412 assert(_saved_index == -1, |
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413 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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414 _saved_index = _index; |
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415 } |
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416 |
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417 void CMMarkStack::note_end_of_gc() { |
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418 // This is intentionally a guarantee, instead of an assert. If we |
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419 // accidentally add something to the mark stack during GC, it |
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420 // will be a correctness issue so it's better if we crash. we'll |
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421 // only check this once per GC anyway, so it won't be a performance |
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422 // issue in any way. |
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423 guarantee(_saved_index == _index, |
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424 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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425 _saved_index = -1; |
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426 } |
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427 |
342 | 428 void CMMarkStack::oops_do(OopClosure* f) { |
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429 assert(_saved_index == _index, |
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430 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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431 for (int i = 0; i < _index; i += 1) { |
342 | 432 f->do_oop(&_base[i]); |
433 } | |
434 } | |
435 | |
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436 CMRootRegions::CMRootRegions() : |
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437 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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438 _should_abort(false), _next_survivor(NULL) { } |
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439 |
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440 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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441 _young_list = g1h->young_list(); |
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442 _cm = cm; |
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443 } |
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444 |
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445 void CMRootRegions::prepare_for_scan() { |
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446 assert(!scan_in_progress(), "pre-condition"); |
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447 |
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448 // Currently, only survivors can be root regions. |
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449 assert(_next_survivor == NULL, "pre-condition"); |
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450 _next_survivor = _young_list->first_survivor_region(); |
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451 _scan_in_progress = (_next_survivor != NULL); |
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452 _should_abort = false; |
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453 } |
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454 |
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455 HeapRegion* CMRootRegions::claim_next() { |
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456 if (_should_abort) { |
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457 // If someone has set the should_abort flag, we return NULL to |
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458 // force the caller to bail out of their loop. |
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459 return NULL; |
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460 } |
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461 |
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462 // Currently, only survivors can be root regions. |
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463 HeapRegion* res = _next_survivor; |
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464 if (res != NULL) { |
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465 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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466 // Read it again in case it changed while we were waiting for the lock. |
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467 res = _next_survivor; |
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468 if (res != NULL) { |
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469 if (res == _young_list->last_survivor_region()) { |
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470 // We just claimed the last survivor so store NULL to indicate |
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471 // that we're done. |
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472 _next_survivor = NULL; |
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473 } else { |
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474 _next_survivor = res->get_next_young_region(); |
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475 } |
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476 } else { |
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477 // Someone else claimed the last survivor while we were trying |
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478 // to take the lock so nothing else to do. |
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479 } |
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480 } |
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481 assert(res == NULL || res->is_survivor(), "post-condition"); |
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482 |
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483 return res; |
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484 } |
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485 |
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486 void CMRootRegions::scan_finished() { |
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487 assert(scan_in_progress(), "pre-condition"); |
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488 |
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489 // Currently, only survivors can be root regions. |
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490 if (!_should_abort) { |
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491 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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492 } |
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493 _next_survivor = NULL; |
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494 |
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495 { |
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496 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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497 _scan_in_progress = false; |
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498 RootRegionScan_lock->notify_all(); |
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499 } |
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500 } |
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501 |
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502 bool CMRootRegions::wait_until_scan_finished() { |
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503 if (!scan_in_progress()) return false; |
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504 |
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505 { |
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506 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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507 while (scan_in_progress()) { |
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508 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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509 } |
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510 } |
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511 return true; |
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512 } |
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513 |
342 | 514 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
515 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
516 #endif // _MSC_VER | |
517 | |
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518 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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519 return MAX2((n_par_threads + 2) / 4, 1U); |
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520 } |
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521 |
20337 | 522 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, G1RegionToSpaceMapper* prev_bitmap_storage, G1RegionToSpaceMapper* next_bitmap_storage) : |
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523 _g1h(g1h), |
20337 | 524 _markBitMap1(), |
525 _markBitMap2(), | |
342 | 526 _parallel_marking_threads(0), |
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527 _max_parallel_marking_threads(0), |
342 | 528 _sleep_factor(0.0), |
529 _marking_task_overhead(1.0), | |
530 _cleanup_sleep_factor(0.0), | |
531 _cleanup_task_overhead(1.0), | |
2152 | 532 _cleanup_list("Cleanup List"), |
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533 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
20337 | 534 _card_bm((g1h->reserved_region().byte_size() + CardTableModRefBS::card_size - 1) >> |
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535 CardTableModRefBS::card_shift, |
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536 false /* in_resource_area*/), |
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537 |
342 | 538 _prevMarkBitMap(&_markBitMap1), |
539 _nextMarkBitMap(&_markBitMap2), | |
540 | |
541 _markStack(this), | |
542 // _finger set in set_non_marking_state | |
543 | |
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544 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
342 | 545 // _active_tasks set in set_non_marking_state |
546 // _tasks set inside the constructor | |
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547 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
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548 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
342 | 549 |
550 _has_overflown(false), | |
551 _concurrent(false), | |
619
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552 _has_aborted(false), |
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553 _aborted_gc_id(GCId::undefined()), |
619
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554 _restart_for_overflow(false), |
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555 _concurrent_marking_in_progress(false), |
342 | 556 |
557 // _verbose_level set below | |
558 | |
559 _init_times(), | |
560 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
561 _cleanup_times(), | |
562 _total_counting_time(0.0), | |
563 _total_rs_scrub_time(0.0), | |
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564 |
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565 _parallel_workers(NULL), |
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566 |
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567 _count_card_bitmaps(NULL), |
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568 _count_marked_bytes(NULL), |
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569 _completed_initialization(false) { |
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570 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
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571 if (verbose_level < no_verbose) { |
342 | 572 verbose_level = no_verbose; |
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573 } |
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574 if (verbose_level > high_verbose) { |
342 | 575 verbose_level = high_verbose; |
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576 } |
342 | 577 _verbose_level = verbose_level; |
578 | |
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579 if (verbose_low()) { |
342 | 580 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
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581 "heap end = " INTPTR_FORMAT, p2i(_heap_start), p2i(_heap_end)); |
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582 } |
342 | 583 |
20337 | 584 _markBitMap1.initialize(g1h->reserved_region(), prev_bitmap_storage); |
585 _markBitMap2.initialize(g1h->reserved_region(), next_bitmap_storage); | |
342 | 586 |
587 // Create & start a ConcurrentMark thread. | |
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588 _cmThread = new ConcurrentMarkThread(this); |
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589 assert(cmThread() != NULL, "CM Thread should have been created"); |
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590 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
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591 if (_cmThread->osthread() == NULL) { |
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592 vm_shutdown_during_initialization("Could not create ConcurrentMarkThread"); |
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593 } |
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594 |
342 | 595 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
20337 | 596 assert(_markBitMap1.covers(g1h->reserved_region()), "_markBitMap1 inconsistency"); |
597 assert(_markBitMap2.covers(g1h->reserved_region()), "_markBitMap2 inconsistency"); | |
342 | 598 |
599 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
1282 | 600 satb_qs.set_buffer_size(G1SATBBufferSize); |
342 | 601 |
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602 _root_regions.init(_g1h, this); |
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603 |
1284 | 604 if (ConcGCThreads > ParallelGCThreads) { |
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605 warning("Can't have more ConcGCThreads (" UINTX_FORMAT ") " |
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606 "than ParallelGCThreads (" UINTX_FORMAT ").", |
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607 ConcGCThreads, ParallelGCThreads); |
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608 return; |
342 | 609 } |
610 if (ParallelGCThreads == 0) { | |
611 // if we are not running with any parallel GC threads we will not | |
612 // spawn any marking threads either | |
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613 _parallel_marking_threads = 0; |
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614 _max_parallel_marking_threads = 0; |
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615 _sleep_factor = 0.0; |
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616 _marking_task_overhead = 1.0; |
342 | 617 } else { |
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618 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
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619 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
342 | 620 // if both are set |
621 _sleep_factor = 0.0; | |
622 _marking_task_overhead = 1.0; | |
751 | 623 } else if (G1MarkingOverheadPercent > 0) { |
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624 // We will calculate the number of parallel marking threads based |
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625 // on a target overhead with respect to the soft real-time goal |
751 | 626 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
342 | 627 double overall_cm_overhead = |
751 | 628 (double) MaxGCPauseMillis * marking_overhead / |
629 (double) GCPauseIntervalMillis; | |
342 | 630 double cpu_ratio = 1.0 / (double) os::processor_count(); |
631 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
632 double marking_task_overhead = | |
633 overall_cm_overhead / marking_thread_num * | |
634 (double) os::processor_count(); | |
635 double sleep_factor = | |
636 (1.0 - marking_task_overhead) / marking_task_overhead; | |
637 | |
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638 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
342 | 639 _sleep_factor = sleep_factor; |
640 _marking_task_overhead = marking_task_overhead; | |
641 } else { | |
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642 // Calculate the number of parallel marking threads by scaling |
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643 // the number of parallel GC threads. |
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644 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
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645 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
342 | 646 _sleep_factor = 0.0; |
647 _marking_task_overhead = 1.0; | |
648 } | |
649 | |
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650 assert(ConcGCThreads > 0, "Should have been set"); |
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651 _parallel_marking_threads = (uint) ConcGCThreads; |
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652 _max_parallel_marking_threads = _parallel_marking_threads; |
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653 |
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654 if (parallel_marking_threads() > 1) { |
342 | 655 _cleanup_task_overhead = 1.0; |
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656 } else { |
342 | 657 _cleanup_task_overhead = marking_task_overhead(); |
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658 } |
342 | 659 _cleanup_sleep_factor = |
660 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
661 | |
662 #if 0 | |
663 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
664 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
665 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
666 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
667 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
668 #endif | |
669 | |
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670 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
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671 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
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672 _max_parallel_marking_threads, false, true); |
1833
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673 if (_parallel_workers == NULL) { |
342 | 674 vm_exit_during_initialization("Failed necessary allocation."); |
1833
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675 } else { |
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|
676 _parallel_workers->initialize_workers(); |
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677 } |
342 | 678 } |
679 | |
7397
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680 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
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681 uintx mark_stack_size = |
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682 MIN2(MarkStackSizeMax, |
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683 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
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684 // Verify that the calculated value for MarkStackSize is in range. |
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685 // It would be nice to use the private utility routine from Arguments. |
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686 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
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687 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
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688 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
17937
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689 mark_stack_size, (uintx) 1, MarkStackSizeMax); |
7397
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690 return; |
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|
691 } |
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692 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
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693 } else { |
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694 // Verify MarkStackSize is in range. |
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695 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
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696 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
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697 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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698 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
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699 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
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700 MarkStackSize, (uintx) 1, MarkStackSizeMax); |
7397
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701 return; |
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|
702 } |
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|
703 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
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704 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
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|
705 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
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|
706 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
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|
707 MarkStackSize, MarkStackSizeMax); |
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|
708 return; |
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|
709 } |
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|
710 } |
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|
711 } |
442f942757c0
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|
712 } |
442f942757c0
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|
713 |
442f942757c0
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|
714 if (!_markStack.allocate(MarkStackSize)) { |
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|
715 warning("Failed to allocate CM marking stack"); |
442f942757c0
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|
716 return; |
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|
717 } |
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|
718 |
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|
719 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
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|
720 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
442f942757c0
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|
721 |
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|
722 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
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723 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
442f942757c0
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|
724 |
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|
725 BitMap::idx_t card_bm_size = _card_bm.size(); |
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726 |
442f942757c0
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727 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
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728 _active_tasks = _max_worker_id; |
442f942757c0
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|
729 |
442f942757c0
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|
730 size_t max_regions = (size_t) _g1h->max_regions(); |
442f942757c0
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|
731 for (uint i = 0; i < _max_worker_id; ++i) { |
442f942757c0
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732 CMTaskQueue* task_queue = new CMTaskQueue(); |
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733 task_queue->initialize(); |
442f942757c0
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|
734 _task_queues->register_queue(i, task_queue); |
442f942757c0
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|
735 |
442f942757c0
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|
736 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
442f942757c0
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|
737 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
442f942757c0
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|
738 |
442f942757c0
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|
739 _tasks[i] = new CMTask(i, this, |
442f942757c0
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|
740 _count_marked_bytes[i], |
442f942757c0
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|
741 &_count_card_bitmaps[i], |
442f942757c0
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|
742 task_queue, _task_queues); |
442f942757c0
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changeset
|
743 |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
744 _accum_task_vtime[i] = 0.0; |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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|
745 } |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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changeset
|
746 |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
747 // Calculate the card number for the bottom of the heap. Used |
442f942757c0
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|
748 // in biasing indexes into the accounting card bitmaps. |
442f942757c0
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|
749 _heap_bottom_card_num = |
442f942757c0
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|
750 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
442f942757c0
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|
751 CardTableModRefBS::card_shift); |
442f942757c0
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|
752 |
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
753 // Clear all the liveness counting data |
442f942757c0
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|
754 clear_all_count_data(); |
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|
755 |
342 | 756 // so that the call below can read a sensible value |
20337 | 757 _heap_start = g1h->reserved_region().start(); |
342 | 758 set_non_marking_state(); |
7397
442f942757c0
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|
759 _completed_initialization = true; |
342 | 760 } |
761 | |
762 void ConcurrentMark::reset() { | |
763 // Starting values for these two. This should be called in a STW | |
20337 | 764 // phase. |
765 MemRegion reserved = _g1h->g1_reserved(); | |
766 _heap_start = reserved.start(); | |
767 _heap_end = reserved.end(); | |
342 | 768 |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
769 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
770 assert(_heap_start != NULL, "heap bounds should look ok"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
771 assert(_heap_end != NULL, "heap bounds should look ok"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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changeset
|
772 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
342 | 773 |
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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|
774 // Reset all the marking data structures and any necessary flags |
d275c3dc73e6
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changeset
|
775 reset_marking_state(); |
342 | 776 |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
777 if (verbose_low()) { |
342 | 778 gclog_or_tty->print_cr("[global] resetting"); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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diff
changeset
|
779 } |
342 | 780 |
781 // We do reset all of them, since different phases will use | |
782 // different number of active threads. So, it's easiest to have all | |
783 // of them ready. | |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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changeset
|
784 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 785 _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
|
786 } |
342 | 787 |
788 // we need this to make sure that the flag is on during the evac | |
789 // pause with initial mark piggy-backed | |
790 set_concurrent_marking_in_progress(); | |
791 } | |
792 | |
7450
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8004816: G1: Kitchensink failures after marking stack changes
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|
793 |
d275c3dc73e6
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|
794 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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|
795 _markStack.set_should_expand(); |
d275c3dc73e6
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changeset
|
796 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
d275c3dc73e6
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|
797 if (clear_overflow) { |
d275c3dc73e6
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diff
changeset
|
798 clear_has_overflown(); |
d275c3dc73e6
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diff
changeset
|
799 } else { |
d275c3dc73e6
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diff
changeset
|
800 assert(has_overflown(), "pre-condition"); |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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changeset
|
801 } |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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diff
changeset
|
802 _finger = _heap_start; |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
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diff
changeset
|
803 |
d275c3dc73e6
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diff
changeset
|
804 for (uint i = 0; i < _max_worker_id; ++i) { |
d275c3dc73e6
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changeset
|
805 CMTaskQueue* queue = _task_queues->queue(i); |
d275c3dc73e6
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johnc
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changeset
|
806 queue->set_empty(); |
d275c3dc73e6
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diff
changeset
|
807 } |
d275c3dc73e6
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johnc
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diff
changeset
|
808 } |
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
johnc
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diff
changeset
|
809 |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
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8787
diff
changeset
|
810 void ConcurrentMark::set_concurrency(uint active_tasks) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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diff
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|
811 assert(active_tasks <= _max_worker_id, "we should not have more"); |
342 | 812 |
813 _active_tasks = active_tasks; | |
814 // Need to update the three data structures below according to the | |
815 // number of active threads for this phase. | |
816 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
817 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
818 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
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8787
diff
changeset
|
819 } |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
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diff
changeset
|
820 |
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821 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
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822 set_concurrency(active_tasks); |
342 | 823 |
824 _concurrent = concurrent; | |
825 // We propagate this to all tasks, not just the active ones. | |
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826 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 827 _tasks[i]->set_concurrent(concurrent); |
828 | |
829 if (concurrent) { | |
830 set_concurrent_marking_in_progress(); | |
831 } else { | |
832 // We currently assume that the concurrent flag has been set to | |
833 // false before we start remark. At this point we should also be | |
834 // in a STW phase. | |
1023
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835 assert(!concurrent_marking_in_progress(), "invariant"); |
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836 assert(out_of_regions(), |
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837 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
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838 p2i(_finger), p2i(_heap_end))); |
342 | 839 } |
840 } | |
841 | |
842 void ConcurrentMark::set_non_marking_state() { | |
843 // We set the global marking state to some default values when we're | |
844 // not doing marking. | |
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845 reset_marking_state(); |
342 | 846 _active_tasks = 0; |
847 clear_concurrent_marking_in_progress(); | |
848 } | |
849 | |
850 ConcurrentMark::~ConcurrentMark() { | |
4735 | 851 // The ConcurrentMark instance is never freed. |
852 ShouldNotReachHere(); | |
342 | 853 } |
854 | |
855 void ConcurrentMark::clearNextBitmap() { | |
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856 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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857 |
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858 // Make sure that the concurrent mark thread looks to still be in |
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859 // the current cycle. |
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860 guarantee(cmThread()->during_cycle(), "invariant"); |
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861 |
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862 // We are finishing up the current cycle by clearing the next |
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863 // marking bitmap and getting it ready for the next cycle. During |
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864 // this time no other cycle can start. So, let's make sure that this |
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865 // is the case. |
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866 guarantee(!g1h->mark_in_progress(), "invariant"); |
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867 |
20337 | 868 ClearBitmapHRClosure cl(this, _nextMarkBitMap, true /* may_yield */); |
869 g1h->heap_region_iterate(&cl); | |
870 | |
871 // Clear the liveness counting data. If the marking has been aborted, the abort() | |
872 // call already did that. | |
873 if (cl.complete()) { | |
874 clear_all_count_data(); | |
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875 } |
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876 |
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877 // Repeat the asserts from above. |
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878 guarantee(cmThread()->during_cycle(), "invariant"); |
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879 guarantee(!g1h->mark_in_progress(), "invariant"); |
342 | 880 } |
881 | |
20337 | 882 class CheckBitmapClearHRClosure : public HeapRegionClosure { |
883 CMBitMap* _bitmap; | |
884 bool _error; | |
885 public: | |
886 CheckBitmapClearHRClosure(CMBitMap* bitmap) : _bitmap(bitmap) { | |
887 } | |
888 | |
889 virtual bool doHeapRegion(HeapRegion* r) { | |
890 return _bitmap->getNextMarkedWordAddress(r->bottom(), r->end()) != r->end(); | |
891 } | |
892 }; | |
893 | |
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894 bool ConcurrentMark::nextMarkBitmapIsClear() { |
20337 | 895 CheckBitmapClearHRClosure cl(_nextMarkBitMap); |
896 _g1h->heap_region_iterate(&cl); | |
897 return cl.complete(); | |
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898 } |
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899 |
342 | 900 class NoteStartOfMarkHRClosure: public HeapRegionClosure { |
901 public: | |
902 bool doHeapRegion(HeapRegion* r) { | |
903 if (!r->continuesHumongous()) { | |
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904 r->note_start_of_marking(); |
342 | 905 } |
906 return false; | |
907 } | |
908 }; | |
909 | |
910 void ConcurrentMark::checkpointRootsInitialPre() { | |
911 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
912 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
913 | |
914 _has_aborted = false; | |
915 | |
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916 #ifndef PRODUCT |
1044 | 917 if (G1PrintReachableAtInitialMark) { |
1388 | 918 print_reachable("at-cycle-start", |
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919 VerifyOption_G1UsePrevMarking, true /* all */); |
1044 | 920 } |
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921 #endif |
342 | 922 |
923 // Initialise marking structures. This has to be done in a STW phase. | |
924 reset(); | |
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925 |
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926 // For each region note start of marking. |
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927 NoteStartOfMarkHRClosure startcl; |
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928 g1h->heap_region_iterate(&startcl); |
342 | 929 } |
930 | |
931 | |
932 void ConcurrentMark::checkpointRootsInitialPost() { | |
933 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
934 | |
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935 // If we force an overflow during remark, the remark operation will |
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936 // actually abort and we'll restart concurrent marking. If we always |
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937 // force an oveflow during remark we'll never actually complete the |
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938 // marking phase. So, we initilize this here, at the start of the |
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939 // cycle, so that at the remaining overflow number will decrease at |
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940 // every remark and we'll eventually not need to cause one. |
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941 force_overflow_stw()->init(); |
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942 |
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943 // Start Concurrent Marking weak-reference discovery. |
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944 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
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945 // enable ("weak") refs discovery |
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946 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
457
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947 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
342 | 948 |
949 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
1317
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950 // This is the start of the marking cycle, we're expected all |
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951 // threads to have SATB queues with active set to false. |
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952 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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953 false /* expected_active */); |
342 | 954 |
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955 _root_regions.prepare_for_scan(); |
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956 |
342 | 957 // update_g1_committed() will be called at the end of an evac pause |
958 // when marking is on. So, it's also called at the end of the | |
959 // initial-mark pause to update the heap end, if the heap expands | |
960 // during it. No need to call it here. | |
961 } | |
962 | |
963 /* | |
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964 * Notice that in the next two methods, we actually leave the STS |
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965 * during the barrier sync and join it immediately afterwards. If we |
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966 * do not do this, the following deadlock can occur: one thread could |
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967 * be in the barrier sync code, waiting for the other thread to also |
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968 * sync up, whereas another one could be trying to yield, while also |
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969 * waiting for the other threads to sync up too. |
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970 * |
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971 * Note, however, that this code is also used during remark and in |
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972 * this case we should not attempt to leave / enter the STS, otherwise |
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973 * we'll either hit an asseert (debug / fastdebug) or deadlock |
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974 * (product). So we should only leave / enter the STS if we are |
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975 * operating concurrently. |
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976 * |
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977 * Because the thread that does the sync barrier has left the STS, it |
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978 * is possible to be suspended for a Full GC or an evacuation pause |
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979 * could occur. This is actually safe, since the entering the sync |
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980 * barrier is one of the last things do_marking_step() does, and it |
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981 * doesn't manipulate any data structures afterwards. |
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982 */ |
342 | 983 |
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984 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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985 if (verbose_low()) { |
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986 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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987 } |
342 | 988 |
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989 if (concurrent()) { |
20192 | 990 SuspendibleThreadSet::leave(); |
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991 } |
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992 |
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993 bool barrier_aborted = !_first_overflow_barrier_sync.enter(); |
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994 |
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995 if (concurrent()) { |
20192 | 996 SuspendibleThreadSet::join(); |
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997 } |
342 | 998 // at this point everyone should have synced up and not be doing any |
999 // more work | |
1000 | |
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1001 if (verbose_low()) { |
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1002 if (barrier_aborted) { |
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1003 gclog_or_tty->print_cr("[%u] aborted first barrier", worker_id); |
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1004 } else { |
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1005 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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1006 } |
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1007 } |
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1008 |
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1009 if (barrier_aborted) { |
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1010 // If the barrier aborted we ignore the overflow condition and |
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1011 // just abort the whole marking phase as quickly as possible. |
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1012 return; |
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1013 } |
342 | 1014 |
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1015 // If we're executing the concurrent phase of marking, reset the marking |
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1016 // state; otherwise the marking state is reset after reference processing, |
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1017 // during the remark pause. |
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1018 // If we reset here as a result of an overflow during the remark we will |
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1019 // see assertion failures from any subsequent set_concurrency_and_phase() |
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1020 // calls. |
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1021 if (concurrent()) { |
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1022 // let the task associated with with worker 0 do this |
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1023 if (worker_id == 0) { |
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1024 // task 0 is responsible for clearing the global data structures |
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1025 // We should be here because of an overflow. During STW we should |
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1026 // not clear the overflow flag since we rely on it being true when |
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1027 // we exit this method to abort the pause and restart concurent |
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1028 // marking. |
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1029 reset_marking_state(true /* clear_overflow */); |
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1030 force_overflow()->update(); |
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1031 |
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1032 if (G1Log::fine()) { |
20190
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1033 gclog_or_tty->gclog_stamp(concurrent_gc_id()); |
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1034 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
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1035 } |
342 | 1036 } |
1037 } | |
1038 | |
1039 // after this, each task should reset its own data structures then | |
1040 // then go into the second barrier | |
1041 } | |
1042 | |
6862
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1043 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
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1044 if (verbose_low()) { |
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1045 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
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1046 } |
342 | 1047 |
3316
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1048 if (concurrent()) { |
20192 | 1049 SuspendibleThreadSet::leave(); |
3316
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1050 } |
17949
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1051 |
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1052 bool barrier_aborted = !_second_overflow_barrier_sync.enter(); |
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1053 |
3316
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1054 if (concurrent()) { |
20192 | 1055 SuspendibleThreadSet::join(); |
3316
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1056 } |
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1057 // at this point everything should be re-initialized and ready to go |
342 | 1058 |
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1059 if (verbose_low()) { |
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1060 if (barrier_aborted) { |
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1061 gclog_or_tty->print_cr("[%u] aborted second barrier", worker_id); |
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1062 } else { |
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1063 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1064 } |
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1065 } |
342 | 1066 } |
1067 | |
3316
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1068 #ifndef PRODUCT |
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1069 void ForceOverflowSettings::init() { |
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1070 _num_remaining = G1ConcMarkForceOverflow; |
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1071 _force = false; |
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1072 update(); |
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1073 } |
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1074 |
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1075 void ForceOverflowSettings::update() { |
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1076 if (_num_remaining > 0) { |
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1077 _num_remaining -= 1; |
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1078 _force = true; |
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1079 } else { |
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1080 _force = false; |
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1081 } |
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1082 } |
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1083 |
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1084 bool ForceOverflowSettings::should_force() { |
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1085 if (_force) { |
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1086 _force = false; |
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1087 return true; |
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1088 } else { |
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1089 return false; |
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1090 } |
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1091 } |
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1092 #endif // !PRODUCT |
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1093 |
342 | 1094 class CMConcurrentMarkingTask: public AbstractGangTask { |
1095 private: | |
1096 ConcurrentMark* _cm; | |
1097 ConcurrentMarkThread* _cmt; | |
1098 | |
1099 public: | |
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1100 void work(uint worker_id) { |
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1101 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1102 "this should only be done by a conc GC thread"); |
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1103 ResourceMark rm; |
342 | 1104 |
1105 double start_vtime = os::elapsedVTime(); | |
1106 | |
20192 | 1107 SuspendibleThreadSet::join(); |
342 | 1108 |
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1109 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1110 CMTask* the_task = _cm->task(worker_id); |
342 | 1111 the_task->record_start_time(); |
1112 if (!_cm->has_aborted()) { | |
1113 do { | |
1114 double start_vtime_sec = os::elapsedVTime(); | |
2174
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1115 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1116 |
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1117 the_task->do_marking_step(mark_step_duration_ms, |
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1118 true /* do_termination */, |
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1119 false /* is_serial*/); |
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1120 |
342 | 1121 double end_vtime_sec = os::elapsedVTime(); |
1122 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
1123 _cm->clear_has_overflown(); | |
1124 | |
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1125 _cm->do_yield_check(worker_id); |
342 | 1126 |
1127 jlong sleep_time_ms; | |
1128 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
1129 sleep_time_ms = | |
1130 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
20192 | 1131 SuspendibleThreadSet::leave(); |
342 | 1132 os::sleep(Thread::current(), sleep_time_ms, false); |
20192 | 1133 SuspendibleThreadSet::join(); |
342 | 1134 } |
1135 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
1136 } | |
1137 the_task->record_end_time(); | |
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1138 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
342 | 1139 |
20192 | 1140 SuspendibleThreadSet::leave(); |
342 | 1141 |
1142 double end_vtime = os::elapsedVTime(); | |
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1143 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
342 | 1144 } |
1145 | |
1146 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
1147 ConcurrentMarkThread* cmt) : | |
1148 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
1149 | |
1150 ~CMConcurrentMarkingTask() { } | |
1151 }; | |
1152 | |
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1153 // Calculates the number of active workers for a concurrent |
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1154 // phase. |
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1155 uint ConcurrentMark::calc_parallel_marking_threads() { |
4711 | 1156 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1157 uint n_conc_workers = 0; |
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1158 if (!UseDynamicNumberOfGCThreads || |
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1159 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1160 !ForceDynamicNumberOfGCThreads)) { |
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1161 n_conc_workers = max_parallel_marking_threads(); |
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1162 } else { |
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1163 n_conc_workers = |
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1164 AdaptiveSizePolicy::calc_default_active_workers( |
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1165 max_parallel_marking_threads(), |
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1166 1, /* Minimum workers */ |
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1167 parallel_marking_threads(), |
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1168 Threads::number_of_non_daemon_threads()); |
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1169 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1170 // that scaling has already gone into "_max_parallel_marking_threads". |
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1171 } |
4711 | 1172 assert(n_conc_workers > 0, "Always need at least 1"); |
1173 return n_conc_workers; | |
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1174 } |
4711 | 1175 // If we are not running with any parallel GC threads we will not |
1176 // have spawned any marking threads either. Hence the number of | |
1177 // concurrent workers should be 0. | |
1178 return 0; | |
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1179 } |
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1180 |
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1181 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1182 // Currently, only survivors can be root regions. |
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1183 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1184 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1185 |
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1186 const uintx interval = PrefetchScanIntervalInBytes; |
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1187 HeapWord* curr = hr->bottom(); |
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1188 const HeapWord* end = hr->top(); |
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1189 while (curr < end) { |
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1190 Prefetch::read(curr, interval); |
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1191 oop obj = oop(curr); |
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1192 int size = obj->oop_iterate(&cl); |
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1193 assert(size == obj->size(), "sanity"); |
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1194 curr += size; |
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1195 } |
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1196 } |
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1197 |
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1198 class CMRootRegionScanTask : public AbstractGangTask { |
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1199 private: |
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1200 ConcurrentMark* _cm; |
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1201 |
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1202 public: |
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1203 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1204 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1205 |
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1206 void work(uint worker_id) { |
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1207 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1208 "this should only be done by a conc GC thread"); |
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1209 |
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1210 CMRootRegions* root_regions = _cm->root_regions(); |
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1211 HeapRegion* hr = root_regions->claim_next(); |
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1212 while (hr != NULL) { |
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1213 _cm->scanRootRegion(hr, worker_id); |
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1214 hr = root_regions->claim_next(); |
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1215 } |
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1216 } |
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1217 }; |
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1218 |
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1219 void ConcurrentMark::scanRootRegions() { |
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1220 // Start of concurrent marking. |
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1221 ClassLoaderDataGraph::clear_claimed_marks(); |
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1222 |
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1223 // scan_in_progress() will have been set to true only if there was |
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1224 // at least one root region to scan. So, if it's false, we |
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1225 // should not attempt to do any further work. |
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1226 if (root_regions()->scan_in_progress()) { |
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1227 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1228 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1229 "Maximum number of marking threads exceeded"); |
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1230 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1231 |
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1232 CMRootRegionScanTask task(this); |
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1233 if (use_parallel_marking_threads()) { |
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1234 _parallel_workers->set_active_workers((int) active_workers); |
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1235 _parallel_workers->run_task(&task); |
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1236 } else { |
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1237 task.work(0); |
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1238 } |
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1239 |
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1240 // It's possible that has_aborted() is true here without actually |
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1241 // aborting the survivor scan earlier. This is OK as it's |
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1242 // mainly used for sanity checking. |
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1243 root_regions()->scan_finished(); |
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1244 } |
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1245 } |
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1246 |
342 | 1247 void ConcurrentMark::markFromRoots() { |
1248 // we might be tempted to assert that: | |
1249 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
1250 // "inconsistent argument?"); | |
1251 // However that wouldn't be right, because it's possible that | |
1252 // a safepoint is indeed in progress as a younger generation | |
1253 // stop-the-world GC happens even as we mark in this generation. | |
1254 | |
1255 _restart_for_overflow = false; | |
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1256 force_overflow_conc()->init(); |
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1257 |
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1258 // _g1h has _n_par_threads |
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1259 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1260 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1261 "Maximum number of marking threads exceeded"); |
4711 | 1262 |
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1263 uint active_workers = MAX2(1U, parallel_marking_threads()); |
4711 | 1264 |
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1265 // Parallel task terminator is set in "set_concurrency_and_phase()" |
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1266 set_concurrency_and_phase(active_workers, true /* concurrent */); |
342 | 1267 |
1268 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
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1269 if (use_parallel_marking_threads()) { |
4711 | 1270 _parallel_workers->set_active_workers((int)active_workers); |
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1271 // Don't set _n_par_threads because it affects MT in process_roots() |
4711 | 1272 // and the decisions on that MT processing is made elsewhere. |
1273 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
342 | 1274 _parallel_workers->run_task(&markingTask); |
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1275 } else { |
342 | 1276 markingTask.work(0); |
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1277 } |
342 | 1278 print_stats(); |
1279 } | |
1280 | |
1281 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
1282 // world is stopped at this checkpoint | |
1283 assert(SafepointSynchronize::is_at_safepoint(), | |
1284 "world should be stopped"); | |
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1285 |
342 | 1286 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1287 | |
1288 // If a full collection has happened, we shouldn't do this. | |
1289 if (has_aborted()) { | |
1290 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1291 return; | |
1292 } | |
1293 | |
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1294 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
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1295 |
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1296 if (VerifyDuringGC) { |
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1297 HandleMark hm; // handle scope |
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1298 Universe::heap()->prepare_for_verify(); |
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1299 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1300 " VerifyDuringGC:(before)"); |
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1301 } |
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1302 g1h->check_bitmaps("Remark Start"); |
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1303 |
342 | 1304 G1CollectorPolicy* g1p = g1h->g1_policy(); |
1305 g1p->record_concurrent_mark_remark_start(); | |
1306 | |
1307 double start = os::elapsedTime(); | |
1308 | |
1309 checkpointRootsFinalWork(); | |
1310 | |
1311 double mark_work_end = os::elapsedTime(); | |
1312 | |
1313 weakRefsWork(clear_all_soft_refs); | |
1314 | |
1315 if (has_overflown()) { | |
1316 // Oops. We overflowed. Restart concurrent marking. | |
1317 _restart_for_overflow = true; | |
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1318 if (G1TraceMarkStackOverflow) { |
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1319 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
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1320 } |
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1321 |
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1322 // Verify the heap w.r.t. the previous marking bitmap. |
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1323 if (VerifyDuringGC) { |
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1324 HandleMark hm; // handle scope |
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1325 Universe::heap()->prepare_for_verify(); |
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1326 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1327 " VerifyDuringGC:(overflow)"); |
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1328 } |
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1329 |
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1330 // Clear the marking state because we will be restarting |
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1331 // marking due to overflowing the global mark stack. |
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1332 reset_marking_state(); |
342 | 1333 } else { |
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1334 // Aggregate the per-task counting data that we have accumulated |
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1335 // while marking. |
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1336 aggregate_count_data(); |
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|
1337 |
2149 | 1338 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
342 | 1339 // We're done with marking. |
1317
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1340 // This is the end of the marking cycle, we're expected all |
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1341 // threads to have SATB queues with active set to true. |
2149 | 1342 satb_mq_set.set_active_all_threads(false, /* new active value */ |
1343 true /* expected_active */); | |
811 | 1344 |
1345 if (VerifyDuringGC) { | |
845
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1346 HandleMark hm; // handle scope |
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1347 Universe::heap()->prepare_for_verify(); |
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1348 Universe::verify(VerifyOption_G1UseNextMarking, |
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1349 " VerifyDuringGC:(after)"); |
811 | 1350 } |
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1351 g1h->check_bitmaps("Remark End"); |
2174
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1352 assert(!restart_for_overflow(), "sanity"); |
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1353 // Completely reset the marking state since marking completed |
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1354 set_non_marking_state(); |
2174
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1355 } |
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1356 |
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1357 // Expand the marking stack, if we have to and if we can. |
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1358 if (_markStack.should_expand()) { |
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1359 _markStack.expand(); |
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1360 } |
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1361 |
342 | 1362 // Statistics |
1363 double now = os::elapsedTime(); | |
1364 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
1365 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
1366 _remark_times.add((now - start) * 1000.0); | |
1367 | |
1368 g1p->record_concurrent_mark_remark_end(); | |
10405 | 1369 |
1370 G1CMIsAliveClosure is_alive(g1h); | |
1371 g1h->gc_tracer_cm()->report_object_count_after_gc(&is_alive); | |
342 | 1372 } |
1373 | |
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1374 // Base class of the closures that finalize and verify the |
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1375 // liveness counting data. |
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1376 class CMCountDataClosureBase: public HeapRegionClosure { |
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1377 protected: |
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1378 G1CollectedHeap* _g1h; |
342 | 1379 ConcurrentMark* _cm; |
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1380 CardTableModRefBS* _ct_bs; |
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1381 |
342 | 1382 BitMap* _region_bm; |
1383 BitMap* _card_bm; | |
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1384 |
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1385 // Takes a region that's not empty (i.e., it has at least one |
829 | 1386 // live object in it and sets its corresponding bit on the region |
1387 // bitmap to 1. If the region is "starts humongous" it will also set | |
1388 // to 1 the bits on the region bitmap that correspond to its | |
1389 // associated "continues humongous" regions. | |
1390 void set_bit_for_region(HeapRegion* hr) { | |
1391 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
1392 | |
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1393 BitMap::idx_t index = (BitMap::idx_t) hr->hrm_index(); |
829 | 1394 if (!hr->startsHumongous()) { |
1395 // Normal (non-humongous) case: just set the bit. | |
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1396 _region_bm->par_at_put(index, true); |
829 | 1397 } else { |
1398 // Starts humongous case: calculate how many regions are part of | |
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1399 // this humongous region and then set the bit range. |
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1400 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
6010
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1401 _region_bm->par_at_put_range(index, end_index, true); |
829 | 1402 } |
1403 } | |
1404 | |
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1405 public: |
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1406 CMCountDataClosureBase(G1CollectedHeap* g1h, |
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1407 BitMap* region_bm, BitMap* card_bm): |
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1408 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1409 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
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1410 _region_bm(region_bm), _card_bm(card_bm) { } |
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1411 }; |
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1412 |
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1413 // Closure that calculates the # live objects per region. Used |
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1414 // for verification purposes during the cleanup pause. |
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1415 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
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1416 CMBitMapRO* _bm; |
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1417 size_t _region_marked_bytes; |
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1418 |
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1419 public: |
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1420 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
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1421 BitMap* region_bm, BitMap* card_bm) : |
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1422 CMCountDataClosureBase(g1h, region_bm, card_bm), |
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1423 _bm(bm), _region_marked_bytes(0) { } |
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1424 |
342 | 1425 bool doHeapRegion(HeapRegion* hr) { |
1426 | |
639 | 1427 if (hr->continuesHumongous()) { |
829 | 1428 // We will ignore these here and process them when their |
1429 // associated "starts humongous" region is processed (see | |
1430 // set_bit_for_heap_region()). Note that we cannot rely on their | |
1431 // associated "starts humongous" region to have their bit set to | |
1432 // 1 since, due to the region chunking in the parallel region | |
1433 // iteration, a "continues humongous" region might be visited | |
1434 // before its associated "starts humongous". | |
639 | 1435 return false; |
1436 } | |
342 | 1437 |
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1438 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1439 HeapWord* start = hr->bottom(); |
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1440 |
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1441 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1442 err_msg("Preconditions not met - " |
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1443 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
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1444 p2i(start), p2i(ntams), p2i(hr->end()))); |
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1445 |
342 | 1446 // Find the first marked object at or after "start". |
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1447 start = _bm->getNextMarkedWordAddress(start, ntams); |
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1448 |
342 | 1449 size_t marked_bytes = 0; |
1450 | |
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1451 while (start < ntams) { |
342 | 1452 oop obj = oop(start); |
1453 int obj_sz = obj->size(); | |
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1454 HeapWord* obj_end = start + obj_sz; |
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1455 |
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1456 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1457 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1458 |
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1459 // Note: if we're looking at the last region in heap - obj_end |
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1460 // could be actually just beyond the end of the heap; end_idx |
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1461 // will then correspond to a (non-existent) card that is also |
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1462 // just beyond the heap. |
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1463 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1464 // end of object is not card aligned - increment to cover |
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1465 // all the cards spanned by the object |
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1466 end_idx += 1; |
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1467 } |
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1468 |
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1469 // Set the bits in the card BM for the cards spanned by this object. |
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1470 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1471 |
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1472 // Add the size of this object to the number of marked bytes. |
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1473 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1474 |
342 | 1475 // Find the next marked object after this one. |
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1476 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
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1477 } |
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1478 |
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1479 // Mark the allocated-since-marking portion... |
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1480 HeapWord* top = hr->top(); |
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1481 if (ntams < top) { |
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1482 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1483 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1484 |
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1485 // Note: if we're looking at the last region in heap - top |
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1486 // could be actually just beyond the end of the heap; end_idx |
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1487 // will then correspond to a (non-existent) card that is also |
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1488 // just beyond the heap. |
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1489 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1490 // end of object is not card aligned - increment to cover |
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1491 // all the cards spanned by the object |
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1492 end_idx += 1; |
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1493 } |
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1494 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1495 |
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1496 // This definitely means the region has live objects. |
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1497 set_bit_for_region(hr); |
342 | 1498 } |
1499 | |
1500 // Update the live region bitmap. | |
1501 if (marked_bytes > 0) { | |
829 | 1502 set_bit_for_region(hr); |
342 | 1503 } |
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1504 |
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1505 // Set the marked bytes for the current region so that |
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1506 // it can be queried by a calling verificiation routine |
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1507 _region_marked_bytes = marked_bytes; |
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1508 |
342 | 1509 return false; |
1510 } | |
1511 | |
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1512 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1513 }; |
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1514 |
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1515 // Heap region closure used for verifying the counting data |
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1516 // that was accumulated concurrently and aggregated during |
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1517 // the remark pause. This closure is applied to the heap |
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1518 // regions during the STW cleanup pause. |
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|
1519 |
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1520 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
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1521 G1CollectedHeap* _g1h; |
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1522 ConcurrentMark* _cm; |
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1523 CalcLiveObjectsClosure _calc_cl; |
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1524 BitMap* _region_bm; // Region BM to be verified |
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1525 BitMap* _card_bm; // Card BM to be verified |
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1526 bool _verbose; // verbose output? |
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|
1527 |
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1528 BitMap* _exp_region_bm; // Expected Region BM values |
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1529 BitMap* _exp_card_bm; // Expected card BM values |
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1530 |
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1531 int _failures; |
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1532 |
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1533 public: |
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1534 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
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1535 BitMap* region_bm, |
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1536 BitMap* card_bm, |
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1537 BitMap* exp_region_bm, |
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1538 BitMap* exp_card_bm, |
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1539 bool verbose) : |
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1540 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1541 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
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1542 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1543 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
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1544 _failures(0) { } |
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1545 |
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1546 int failures() const { return _failures; } |
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1547 |
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1548 bool doHeapRegion(HeapRegion* hr) { |
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1549 if (hr->continuesHumongous()) { |
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1550 // We will ignore these here and process them when their |
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1551 // associated "starts humongous" region is processed (see |
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1552 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1553 // associated "starts humongous" region to have their bit set to |
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1554 // 1 since, due to the region chunking in the parallel region |
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1555 // iteration, a "continues humongous" region might be visited |
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1556 // before its associated "starts humongous". |
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|
1557 return false; |
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|
1558 } |
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|
1559 |
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|
1560 int failures = 0; |
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|
1561 |
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1562 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1563 // this region and set the corresponding bits in the expected region |
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1564 // and card bitmaps. |
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|
1565 bool res = _calc_cl.doHeapRegion(hr); |
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1566 assert(res == false, "should be continuing"); |
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|
1567 |
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|
1568 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
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|
1569 Mutex::_no_safepoint_check_flag); |
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|
1570 |
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|
1571 // Verify the marked bytes for this region. |
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|
1572 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
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|
1573 size_t act_marked_bytes = hr->next_marked_bytes(); |
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|
1574 |
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|
1575 // We're not OK if expected marked bytes > actual marked bytes. It means |
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1576 // we have missed accounting some objects during the actual marking. |
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|
1577 if (exp_marked_bytes > act_marked_bytes) { |
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|
1578 if (_verbose) { |
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|
1579 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
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|
1580 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
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|
1581 hr->hrm_index(), exp_marked_bytes, act_marked_bytes); |
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|
1582 } |
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|
1583 failures += 1; |
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|
1584 } |
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|
1585 |
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|
1586 // Verify the bit, for this region, in the actual and expected |
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|
1587 // (which was just calculated) region bit maps. |
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1588 // We're not OK if the bit in the calculated expected region |
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|
1589 // bitmap is set and the bit in the actual region bitmap is not. |
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|
1590 BitMap::idx_t index = (BitMap::idx_t) hr->hrm_index(); |
4836
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|
1591 |
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|
1592 bool expected = _exp_region_bm->at(index); |
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|
1593 bool actual = _region_bm->at(index); |
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|
1594 if (expected && !actual) { |
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|
1595 if (_verbose) { |
6010
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|
1596 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
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|
1597 "expected: %s, actual: %s", |
20377
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|
1598 hr->hrm_index(), |
6010
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|
1599 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
4836
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|
1600 } |
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|
1601 failures += 1; |
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|
1602 } |
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|
1603 |
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|
1604 // Verify that the card bit maps for the cards spanned by the current |
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|
1605 // region match. We have an error if we have a set bit in the expected |
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1606 // bit map and the corresponding bit in the actual bitmap is not set. |
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|
1607 |
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|
1608 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
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|
1609 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
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|
1610 |
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|
1611 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
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|
1612 expected = _exp_card_bm->at(i); |
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|
1613 actual = _card_bm->at(i); |
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|
1614 |
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|
1615 if (expected && !actual) { |
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|
1616 if (_verbose) { |
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|
1617 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
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|
1618 "expected: %s, actual: %s", |
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|
1619 hr->hrm_index(), i, |
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|
1620 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
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|
1621 } |
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|
1622 failures += 1; |
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|
1623 } |
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|
1624 } |
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|
1625 |
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|
1626 if (failures > 0 && _verbose) { |
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|
1627 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
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|
1628 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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diff
changeset
|
1629 HR_FORMAT_PARAMS(hr), p2i(hr->next_top_at_mark_start()), |
4836
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|
1630 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
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1631 } |
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|
1632 |
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1633 _failures += failures; |
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|
1634 |
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1635 // We could stop iteration over the heap when we |
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1636 // find the first violating region by returning true. |
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1637 return false; |
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1638 } |
342 | 1639 }; |
1640 | |
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1641 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
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1642 protected: |
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1643 G1CollectedHeap* _g1h; |
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1644 ConcurrentMark* _cm; |
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1645 BitMap* _actual_region_bm; |
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1646 BitMap* _actual_card_bm; |
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1647 |
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1648 uint _n_workers; |
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|
1649 |
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1650 BitMap* _expected_region_bm; |
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1651 BitMap* _expected_card_bm; |
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1652 |
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1653 int _failures; |
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|
1654 bool _verbose; |
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|
1655 |
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|
1656 public: |
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1657 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
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1658 BitMap* region_bm, BitMap* card_bm, |
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1659 BitMap* expected_region_bm, BitMap* expected_card_bm) |
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1660 : AbstractGangTask("G1 verify final counting"), |
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1661 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1662 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1663 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
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1664 _failures(0), _verbose(false), |
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1665 _n_workers(0) { |
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1666 assert(VerifyDuringGC, "don't call this otherwise"); |
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|
1667 |
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1668 // Use the value already set as the number of active threads |
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|
1669 // in the call to run_task(). |
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|
1670 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1671 assert( _g1h->workers()->active_workers() > 0, |
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1672 "Should have been previously set"); |
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1673 _n_workers = _g1h->workers()->active_workers(); |
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|
1674 } else { |
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|
1675 _n_workers = 1; |
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|
1676 } |
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|
1677 |
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|
1678 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
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|
1679 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
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|
1680 |
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|
1681 _verbose = _cm->verbose_medium(); |
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|
1682 } |
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|
1683 |
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|
1684 void work(uint worker_id) { |
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|
1685 assert(worker_id < _n_workers, "invariant"); |
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|
1686 |
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|
1687 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
4836
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|
1688 _actual_region_bm, _actual_card_bm, |
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|
1689 _expected_region_bm, |
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diff
changeset
|
1690 _expected_card_bm, |
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|
1691 _verbose); |
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|
1692 |
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|
1693 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
1694 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
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|
1695 worker_id, |
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|
1696 _n_workers, |
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|
1697 HeapRegion::VerifyCountClaimValue); |
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|
1698 } else { |
d30fa85f9994
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|
1699 _g1h->heap_region_iterate(&verify_cl); |
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|
1700 } |
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|
1701 |
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|
1702 Atomic::add(verify_cl.failures(), &_failures); |
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|
1703 } |
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|
1704 |
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|
1705 int failures() const { return _failures; } |
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|
1706 }; |
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|
1707 |
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|
1708 // Closure that finalizes the liveness counting data. |
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|
1709 // Used during the cleanup pause. |
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|
1710 // Sets the bits corresponding to the interval [NTAMS, top] |
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|
1711 // (which contains the implicitly live objects) in the |
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|
1712 // card liveness bitmap. Also sets the bit for each region, |
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|
1713 // containing live data, in the region liveness bitmap. |
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|
1714 |
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|
1715 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
4836
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|
1716 public: |
6812
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|
1717 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
4836
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|
1718 BitMap* region_bm, |
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|
1719 BitMap* card_bm) : |
6812
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|
1720 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
4836
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|
1721 |
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|
1722 bool doHeapRegion(HeapRegion* hr) { |
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|
1723 |
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|
1724 if (hr->continuesHumongous()) { |
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|
1725 // We will ignore these here and process them when their |
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|
1726 // associated "starts humongous" region is processed (see |
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|
1727 // set_bit_for_heap_region()). Note that we cannot rely on their |
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|
1728 // associated "starts humongous" region to have their bit set to |
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|
1729 // 1 since, due to the region chunking in the parallel region |
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|
1730 // iteration, a "continues humongous" region might be visited |
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|
1731 // before its associated "starts humongous". |
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|
1732 return false; |
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|
1733 } |
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|
1734 |
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|
1735 HeapWord* ntams = hr->next_top_at_mark_start(); |
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|
1736 HeapWord* top = hr->top(); |
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|
1737 |
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|
1738 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
4836
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|
1739 |
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|
1740 // Mark the allocated-since-marking portion... |
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|
1741 if (ntams < top) { |
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|
1742 // This definitely means the region has live objects. |
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|
1743 set_bit_for_region(hr); |
6812
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|
1744 |
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|
1745 // Now set the bits in the card bitmap for [ntams, top) |
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|
1746 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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|
1747 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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|
1748 |
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|
1749 // Note: if we're looking at the last region in heap - top |
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|
1750 // could be actually just beyond the end of the heap; end_idx |
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|
1751 // will then correspond to a (non-existent) card that is also |
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|
1752 // just beyond the heap. |
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|
1753 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
988bf00cc564
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|
1754 // end of object is not card aligned - increment to cover |
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diff
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|
1755 // all the cards spanned by the object |
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|
1756 end_idx += 1; |
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|
1757 } |
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|
1758 |
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1759 assert(end_idx <= _card_bm->size(), |
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1760 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1761 end_idx, _card_bm->size())); |
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|
1762 assert(start_idx < _card_bm->size(), |
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1763 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
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|
1764 start_idx, _card_bm->size())); |
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1765 |
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1766 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
6725
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1767 } |
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1768 |
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1769 // Set the bit for the region if it contains live data |
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1770 if (hr->next_marked_bytes() > 0) { |
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1771 set_bit_for_region(hr); |
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1772 } |
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|
1773 |
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1774 return false; |
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1775 } |
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|
1776 }; |
342 | 1777 |
1778 class G1ParFinalCountTask: public AbstractGangTask { | |
1779 protected: | |
1780 G1CollectedHeap* _g1h; | |
4836
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1781 ConcurrentMark* _cm; |
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1782 BitMap* _actual_region_bm; |
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1783 BitMap* _actual_card_bm; |
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1784 |
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1785 uint _n_workers; |
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1786 |
342 | 1787 public: |
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1788 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
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1789 : AbstractGangTask("G1 final counting"), |
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1790 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
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1791 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
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1792 _n_workers(0) { |
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1793 // Use the value already set as the number of active threads |
6011 | 1794 // in the call to run_task(). |
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1795 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1796 assert( _g1h->workers()->active_workers() > 0, |
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1797 "Should have been previously set"); |
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1798 _n_workers = _g1h->workers()->active_workers(); |
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1799 } else { |
342 | 1800 _n_workers = 1; |
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1801 } |
342 | 1802 } |
1803 | |
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1804 void work(uint worker_id) { |
4836
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1805 assert(worker_id < _n_workers, "invariant"); |
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1806 |
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1807 FinalCountDataUpdateClosure final_update_cl(_g1h, |
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1808 _actual_region_bm, |
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1809 _actual_card_bm); |
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1810 |
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1811 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1812 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
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1813 worker_id, |
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1814 _n_workers, |
355 | 1815 HeapRegion::FinalCountClaimValue); |
342 | 1816 } else { |
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1817 _g1h->heap_region_iterate(&final_update_cl); |
342 | 1818 } |
1819 } | |
1820 }; | |
1821 | |
1822 class G1ParNoteEndTask; | |
1823 | |
1824 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
1825 G1CollectedHeap* _g1; | |
1826 size_t _max_live_bytes; | |
6010
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1827 uint _regions_claimed; |
342 | 1828 size_t _freed_bytes; |
2173 | 1829 FreeRegionList* _local_cleanup_list; |
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1830 HeapRegionSetCount _old_regions_removed; |
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1831 HeapRegionSetCount _humongous_regions_removed; |
2173 | 1832 HRRSCleanupTask* _hrrs_cleanup_task; |
342 | 1833 double _claimed_region_time; |
1834 double _max_region_time; | |
1835 | |
1836 public: | |
1837 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
2173 | 1838 FreeRegionList* local_cleanup_list, |
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1839 HRRSCleanupTask* hrrs_cleanup_task) : |
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1840 _g1(g1), |
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1841 _max_live_bytes(0), _regions_claimed(0), |
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1842 _freed_bytes(0), |
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1843 _claimed_region_time(0.0), _max_region_time(0.0), |
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1844 _local_cleanup_list(local_cleanup_list), |
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1845 _old_regions_removed(), |
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1846 _humongous_regions_removed(), |
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1847 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1848 |
342 | 1849 size_t freed_bytes() { return _freed_bytes; } |
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1850 const HeapRegionSetCount& old_regions_removed() { return _old_regions_removed; } |
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1851 const HeapRegionSetCount& humongous_regions_removed() { return _humongous_regions_removed; } |
342 | 1852 |
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1853 bool doHeapRegion(HeapRegion *hr) { |
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1854 if (hr->continuesHumongous()) { |
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1855 return false; |
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1856 } |
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1857 // We use a claim value of zero here because all regions |
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1858 // were claimed with value 1 in the FinalCount task. |
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1859 _g1->reset_gc_time_stamps(hr); |
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1860 double start = os::elapsedTime(); |
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1861 _regions_claimed++; |
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1862 hr->note_end_of_marking(); |
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1863 _max_live_bytes += hr->max_live_bytes(); |
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1864 |
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1865 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { |
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1866 _freed_bytes += hr->used(); |
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1867 hr->set_containing_set(NULL); |
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1868 if (hr->isHumongous()) { |
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1869 assert(hr->startsHumongous(), "we should only see starts humongous"); |
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1870 _humongous_regions_removed.increment(1u, hr->capacity()); |
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1871 _g1->free_humongous_region(hr, _local_cleanup_list, true); |
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1872 } else { |
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1873 _old_regions_removed.increment(1u, hr->capacity()); |
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1874 _g1->free_region(hr, _local_cleanup_list, true); |
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1875 } |
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1876 } else { |
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1877 hr->rem_set()->do_cleanup_work(_hrrs_cleanup_task); |
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1878 } |
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1879 |
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1880 double region_time = (os::elapsedTime() - start); |
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1881 _claimed_region_time += region_time; |
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1882 if (region_time > _max_region_time) { |
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1883 _max_region_time = region_time; |
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1884 } |
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1885 return false; |
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1886 } |
342 | 1887 |
1888 size_t max_live_bytes() { return _max_live_bytes; } | |
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1889 uint regions_claimed() { return _regions_claimed; } |
342 | 1890 double claimed_region_time_sec() { return _claimed_region_time; } |
1891 double max_region_time_sec() { return _max_region_time; } | |
1892 }; | |
1893 | |
1894 class G1ParNoteEndTask: public AbstractGangTask { | |
1895 friend class G1NoteEndOfConcMarkClosure; | |
2152 | 1896 |
342 | 1897 protected: |
1898 G1CollectedHeap* _g1h; | |
1899 size_t _max_live_bytes; | |
1900 size_t _freed_bytes; | |
2152 | 1901 FreeRegionList* _cleanup_list; |
1902 | |
342 | 1903 public: |
1904 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
2152 | 1905 FreeRegionList* cleanup_list) : |
342 | 1906 AbstractGangTask("G1 note end"), _g1h(g1h), |
2152 | 1907 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
342 | 1908 |
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1909 void work(uint worker_id) { |
342 | 1910 double start = os::elapsedTime(); |
2173 | 1911 FreeRegionList local_cleanup_list("Local Cleanup List"); |
1912 HRRSCleanupTask hrrs_cleanup_task; | |
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1913 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, &local_cleanup_list, |
2173 | 1914 &hrrs_cleanup_task); |
1833
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1915 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1916 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1917 _g1h->workers()->active_workers(), |
355 | 1918 HeapRegion::NoteEndClaimValue); |
342 | 1919 } else { |
1920 _g1h->heap_region_iterate(&g1_note_end); | |
1921 } | |
1922 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
1923 | |
2152 | 1924 // Now update the lists |
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1925 _g1h->remove_from_old_sets(g1_note_end.old_regions_removed(), g1_note_end.humongous_regions_removed()); |
342 | 1926 { |
1927 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
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1928 _g1h->decrement_summary_bytes(g1_note_end.freed_bytes()); |
342 | 1929 _max_live_bytes += g1_note_end.max_live_bytes(); |
1930 _freed_bytes += g1_note_end.freed_bytes(); | |
2152 | 1931 |
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1932 // If we iterate over the global cleanup list at the end of |
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1933 // cleanup to do this printing we will not guarantee to only |
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1934 // generate output for the newly-reclaimed regions (the list |
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1935 // might not be empty at the beginning of cleanup; we might |
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1936 // still be working on its previous contents). So we do the |
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1937 // printing here, before we append the new regions to the global |
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1938 // cleanup list. |
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1939 |
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1940 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1941 if (hr_printer->is_active()) { |
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1942 FreeRegionListIterator iter(&local_cleanup_list); |
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1943 while (iter.more_available()) { |
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1944 HeapRegion* hr = iter.get_next(); |
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1945 hr_printer->cleanup(hr); |
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1946 } |
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1947 } |
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1948 |
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1949 _cleanup_list->add_ordered(&local_cleanup_list); |
2173 | 1950 assert(local_cleanup_list.is_empty(), "post-condition"); |
1951 | |
1952 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
342 | 1953 } |
1954 } | |
1955 size_t max_live_bytes() { return _max_live_bytes; } | |
1956 size_t freed_bytes() { return _freed_bytes; } | |
1957 }; | |
1958 | |
1959 class G1ParScrubRemSetTask: public AbstractGangTask { | |
1960 protected: | |
1961 G1RemSet* _g1rs; | |
1962 BitMap* _region_bm; | |
1963 BitMap* _card_bm; | |
1964 public: | |
1965 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
1966 BitMap* region_bm, BitMap* card_bm) : | |
1967 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
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1968 _region_bm(region_bm), _card_bm(card_bm) { } |
342 | 1969 |
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1970 void work(uint worker_id) { |
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1971 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1972 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
355 | 1973 HeapRegion::ScrubRemSetClaimValue); |
342 | 1974 } else { |
1975 _g1rs->scrub(_region_bm, _card_bm); | |
1976 } | |
1977 } | |
1978 | |
1979 }; | |
1980 | |
1981 void ConcurrentMark::cleanup() { | |
1982 // world is stopped at this checkpoint | |
1983 assert(SafepointSynchronize::is_at_safepoint(), | |
1984 "world should be stopped"); | |
1985 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1986 | |
1987 // If a full collection has happened, we shouldn't do this. | |
1988 if (has_aborted()) { | |
1989 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
1990 return; | |
1991 } | |
1992 | |
2152 | 1993 g1h->verify_region_sets_optional(); |
1994 | |
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1995 if (VerifyDuringGC) { |
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1996 HandleMark hm; // handle scope |
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1997 Universe::heap()->prepare_for_verify(); |
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1998 Universe::verify(VerifyOption_G1UsePrevMarking, |
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1999 " VerifyDuringGC:(before)"); |
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2000 } |
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2001 g1h->check_bitmaps("Cleanup Start"); |
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2002 |
342 | 2003 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
2004 g1p->record_concurrent_mark_cleanup_start(); | |
2005 | |
2006 double start = os::elapsedTime(); | |
2007 | |
2173 | 2008 HeapRegionRemSet::reset_for_cleanup_tasks(); |
2009 | |
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2010 uint n_workers; |
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2011 |
342 | 2012 // Do counting once more with the world stopped for good measure. |
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2013 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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2014 |
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2015 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2016 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
355 | 2017 "sanity check"); |
2018 | |
4711 | 2019 g1h->set_par_threads(); |
2020 n_workers = g1h->n_par_threads(); | |
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2021 assert(g1h->n_par_threads() == n_workers, |
4711 | 2022 "Should not have been reset"); |
342 | 2023 g1h->workers()->run_task(&g1_par_count_task); |
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2024 // Done with the parallel phase so reset to 0. |
342 | 2025 g1h->set_par_threads(0); |
355 | 2026 |
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2027 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
355 | 2028 "sanity check"); |
342 | 2029 } else { |
4711 | 2030 n_workers = 1; |
342 | 2031 g1_par_count_task.work(0); |
2032 } | |
2033 | |
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2034 if (VerifyDuringGC) { |
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2035 // Verify that the counting data accumulated during marking matches |
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2036 // that calculated by walking the marking bitmap. |
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2037 |
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2038 // Bitmaps to hold expected values |
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2039 BitMap expected_region_bm(_region_bm.size(), true); |
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2040 BitMap expected_card_bm(_card_bm.size(), true); |
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2041 |
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2042 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
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2043 &_region_bm, |
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2044 &_card_bm, |
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2045 &expected_region_bm, |
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2046 &expected_card_bm); |
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2047 |
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2048 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2049 g1h->set_par_threads((int)n_workers); |
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2050 g1h->workers()->run_task(&g1_par_verify_task); |
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2051 // Done with the parallel phase so reset to 0. |
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2052 g1h->set_par_threads(0); |
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2053 |
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2054 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
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2055 "sanity check"); |
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2056 } else { |
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2057 g1_par_verify_task.work(0); |
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2058 } |
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2059 |
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2060 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
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2061 } |
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2062 |
342 | 2063 size_t start_used_bytes = g1h->used(); |
2064 g1h->set_marking_complete(); | |
2065 | |
2066 double count_end = os::elapsedTime(); | |
2067 double this_final_counting_time = (count_end - start); | |
2068 _total_counting_time += this_final_counting_time; | |
2069 | |
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2070 if (G1PrintRegionLivenessInfo) { |
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2071 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
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2072 _g1h->heap_region_iterate(&cl); |
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2073 } |
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2074 |
342 | 2075 // Install newly created mark bitMap as "prev". |
2076 swapMarkBitMaps(); | |
2077 | |
2078 g1h->reset_gc_time_stamp(); | |
2079 | |
2080 // Note end of marking in all heap regions. | |
2152 | 2081 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
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2082 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2083 g1h->set_par_threads((int)n_workers); |
342 | 2084 g1h->workers()->run_task(&g1_par_note_end_task); |
2085 g1h->set_par_threads(0); | |
355 | 2086 |
2087 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
2088 "sanity check"); | |
342 | 2089 } else { |
2090 g1_par_note_end_task.work(0); | |
2091 } | |
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2092 g1h->check_gc_time_stamps(); |
2152 | 2093 |
2094 if (!cleanup_list_is_empty()) { | |
2095 // The cleanup list is not empty, so we'll have to process it | |
2096 // concurrently. Notify anyone else that might be wanting free | |
2097 // regions that there will be more free regions coming soon. | |
2098 g1h->set_free_regions_coming(); | |
2099 } | |
342 | 2100 |
2101 // call below, since it affects the metric by which we sort the heap | |
2102 // regions. | |
2103 if (G1ScrubRemSets) { | |
2104 double rs_scrub_start = os::elapsedTime(); | |
2105 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
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2106 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2107 g1h->set_par_threads((int)n_workers); |
342 | 2108 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
2109 g1h->set_par_threads(0); | |
355 | 2110 |
2111 assert(g1h->check_heap_region_claim_values( | |
2112 HeapRegion::ScrubRemSetClaimValue), | |
2113 "sanity check"); | |
342 | 2114 } else { |
2115 g1_par_scrub_rs_task.work(0); | |
2116 } | |
2117 | |
2118 double rs_scrub_end = os::elapsedTime(); | |
2119 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
2120 _total_rs_scrub_time += this_rs_scrub_time; | |
2121 } | |
2122 | |
2123 // this will also free any regions totally full of garbage objects, | |
2124 // and sort the regions. | |
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2125 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
342 | 2126 |
2127 // Statistics. | |
2128 double end = os::elapsedTime(); | |
2129 _cleanup_times.add((end - start) * 1000.0); | |
2130 | |
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2131 if (G1Log::fine()) { |
342 | 2132 g1h->print_size_transition(gclog_or_tty, |
2133 start_used_bytes, | |
2134 g1h->used(), | |
2135 g1h->capacity()); | |
2136 } | |
2137 | |
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2138 // Clean up will have freed any regions completely full of garbage. |
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2139 // Update the soft reference policy with the new heap occupancy. |
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2140 Universe::update_heap_info_at_gc(); |
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2141 |
751 | 2142 if (VerifyDuringGC) { |
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2143 HandleMark hm; // handle scope |
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2144 Universe::heap()->prepare_for_verify(); |
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2145 Universe::verify(VerifyOption_G1UsePrevMarking, |
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2146 " VerifyDuringGC:(after)"); |
342 | 2147 } |
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2148 g1h->check_bitmaps("Cleanup End"); |
2152 | 2149 |
2150 g1h->verify_region_sets_optional(); | |
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2151 |
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2152 // We need to make this be a "collection" so any collection pause that |
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2153 // races with it goes around and waits for completeCleanup to finish. |
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2154 g1h->increment_total_collections(); |
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|
2155 |
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|
2156 // Clean out dead classes and update Metaspace sizes. |
20282
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|
2157 if (ClassUnloadingWithConcurrentMark) { |
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|
2158 ClassLoaderDataGraph::purge(); |
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|
2159 } |
20278
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|
2160 MetaspaceGC::compute_new_size(); |
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|
2161 |
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2162 // We reclaimed old regions so we should calculate the sizes to make |
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2163 // sure we update the old gen/space data. |
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2164 g1h->g1mm()->update_sizes(); |
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2165 |
10405 | 2166 g1h->trace_heap_after_concurrent_cycle(); |
342 | 2167 } |
2168 | |
2169 void ConcurrentMark::completeCleanup() { | |
2170 if (has_aborted()) return; | |
2171 | |
2152 | 2172 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
2173 | |
17841
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2174 _cleanup_list.verify_optional(); |
2361 | 2175 FreeRegionList tmp_free_list("Tmp Free List"); |
2152 | 2176 |
2177 if (G1ConcRegionFreeingVerbose) { | |
2178 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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|
2179 "cleanup list has %u entries", |
2152 | 2180 _cleanup_list.length()); |
2181 } | |
2182 | |
20337 | 2183 // No one else should be accessing the _cleanup_list at this point, |
2184 // so it is not necessary to take any locks | |
2152 | 2185 while (!_cleanup_list.is_empty()) { |
20336
6701abbc4441
8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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|
2186 HeapRegion* hr = _cleanup_list.remove_region(true /* from_head */); |
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2187 assert(hr != NULL, "Got NULL from a non-empty list"); |
3317
063382f9b575
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|
2188 hr->par_clear(); |
17773
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|
2189 tmp_free_list.add_ordered(hr); |
2152 | 2190 |
2191 // Instead of adding one region at a time to the secondary_free_list, | |
2192 // we accumulate them in the local list and move them a few at a | |
2193 // time. This also cuts down on the number of notify_all() calls | |
2194 // we do during this process. We'll also append the local list when | |
2195 // _cleanup_list is empty (which means we just removed the last | |
2196 // region from the _cleanup_list). | |
2361 | 2197 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
2152 | 2198 _cleanup_list.is_empty()) { |
2199 if (G1ConcRegionFreeingVerbose) { | |
2200 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
6010
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2201 "appending %u entries to the secondary_free_list, " |
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2202 "cleanup list still has %u entries", |
2361 | 2203 tmp_free_list.length(), |
2152 | 2204 _cleanup_list.length()); |
342 | 2205 } |
2152 | 2206 |
2207 { | |
2208 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
17773
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|
2209 g1h->secondary_free_list_add(&tmp_free_list); |
2152 | 2210 SecondaryFreeList_lock->notify_all(); |
2211 } | |
2212 | |
2213 if (G1StressConcRegionFreeing) { | |
2214 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
2215 os::sleep(Thread::current(), (jlong) 1, false); | |
2216 } | |
2217 } | |
342 | 2218 } |
2219 } | |
2361 | 2220 assert(tmp_free_list.is_empty(), "post-condition"); |
342 | 2221 } |
2222 | |
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|
2223 // Supporting Object and Oop closures for reference discovery |
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|
2224 // and processing in during marking |
2174
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|
2225 |
2037
b03260081e9b
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diff
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|
2226 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
b03260081e9b
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|
2227 HeapWord* addr = (HeapWord*)obj; |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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1974
diff
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|
2228 return addr != NULL && |
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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1974
diff
changeset
|
2229 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
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7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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|
2230 } |
342 | 2231 |
8014
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|
2232 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
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|
2233 // Uses the CMTask associated with a worker thread (for serial reference |
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|
2234 // processing the CMTask for worker 0 is used) to preserve (mark) and |
f90b9bceb8e5
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|
2235 // trace referent objects. |
f90b9bceb8e5
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|
2236 // |
f90b9bceb8e5
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|
2237 // Using the CMTask and embedded local queues avoids having the worker |
f90b9bceb8e5
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|
2238 // threads operating on the global mark stack. This reduces the risk |
f90b9bceb8e5
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|
2239 // of overflowing the stack - which we would rather avoid at this late |
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|
2240 // state. Also using the tasks' local queues removes the potential |
f90b9bceb8e5
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|
2241 // of the workers interfering with each other that could occur if |
f90b9bceb8e5
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|
2242 // operating on the global stack. |
f90b9bceb8e5
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|
2243 |
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|
2244 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
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|
2245 ConcurrentMark* _cm; |
fa08949fe0cb
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|
2246 CMTask* _task; |
fa08949fe0cb
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diff
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|
2247 int _ref_counter_limit; |
fa08949fe0cb
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|
2248 int _ref_counter; |
fa08949fe0cb
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|
2249 bool _is_serial; |
2174
234761c55641
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diff
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|
2250 public: |
8787
fa08949fe0cb
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diff
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|
2251 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
fa08949fe0cb
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|
2252 _cm(cm), _task(task), _is_serial(is_serial), |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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|
2253 _ref_counter_limit(G1RefProcDrainInterval) { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2254 assert(_ref_counter_limit > 0, "sanity"); |
8787
fa08949fe0cb
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|
2255 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
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|
2256 _ref_counter = _ref_counter_limit; |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2257 } |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2258 |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2259 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
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|
2260 virtual void do_oop( oop* p) { do_oop_work(p); } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2261 |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2262 template <class T> void do_oop_work(T* p) { |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2263 if (!_cm->has_overflown()) { |
234761c55641
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johnc
parents:
2152
diff
changeset
|
2264 oop obj = oopDesc::load_decode_heap_oop(p); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
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|
2265 if (_cm->verbose_high()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
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|
2266 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2267 "*"PTR_FORMAT" = "PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
2268 _task->worker_id(), p2i(p), p2i((void*) obj)); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
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|
2269 } |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2270 |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
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2152
diff
changeset
|
2271 _task->deal_with_reference(obj); |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2272 _ref_counter--; |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2273 |
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
2274 if (_ref_counter == 0) { |
8014
f90b9bceb8e5
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|
2275 // We have dealt with _ref_counter_limit references, pushing them |
f90b9bceb8e5
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8008
diff
changeset
|
2276 // and objects reachable from them on to the local stack (and |
f90b9bceb8e5
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8008
diff
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|
2277 // possibly the global stack). Call CMTask::do_marking_step() to |
f90b9bceb8e5
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8008
diff
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|
2278 // process these entries. |
f90b9bceb8e5
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johnc
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8008
diff
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|
2279 // |
f90b9bceb8e5
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8008
diff
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|
2280 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
f90b9bceb8e5
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8008
diff
changeset
|
2281 // there's nothing more to do (i.e. we're done with the entries that |
f90b9bceb8e5
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diff
changeset
|
2282 // were pushed as a result of the CMTask::deal_with_reference() calls |
f90b9bceb8e5
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8008
diff
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|
2283 // above) or we overflow. |
f90b9bceb8e5
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8008
diff
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|
2284 // |
f90b9bceb8e5
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|
2285 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
f90b9bceb8e5
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diff
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|
2286 // flag while there may still be some work to do. (See the comment at |
f90b9bceb8e5
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|
2287 // the beginning of CMTask::do_marking_step() for those conditions - |
f90b9bceb8e5
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|
2288 // one of which is reaching the specified time target.) It is only |
f90b9bceb8e5
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|
2289 // when CMTask::do_marking_step() returns without setting the |
f90b9bceb8e5
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|
2290 // has_aborted() flag that the marking step has completed. |
2174
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diff
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|
2291 do { |
234761c55641
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|
2292 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
234761c55641
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|
2293 _task->do_marking_step(mark_step_duration_ms, |
8787
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8744
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|
2294 false /* do_termination */, |
fa08949fe0cb
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diff
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|
2295 _is_serial); |
2174
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|
2296 } while (_task->has_aborted() && !_cm->has_overflown()); |
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|
2297 _ref_counter = _ref_counter_limit; |
234761c55641
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|
2298 } |
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|
2299 } else { |
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|
2300 if (_cm->verbose_high()) { |
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|
2301 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
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|
2302 } |
2174
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|
2303 } |
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|
2304 } |
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|
2305 }; |
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|
2306 |
8014
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|
2307 // 'Drain' oop closure used by both serial and parallel reference processing. |
f90b9bceb8e5
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|
2308 // Uses the CMTask associated with a given worker thread (for serial |
f90b9bceb8e5
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|
2309 // reference processing the CMtask for worker 0 is used). Calls the |
f90b9bceb8e5
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8008
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changeset
|
2310 // do_marking_step routine, with an unbelievably large timeout value, |
f90b9bceb8e5
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8008
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changeset
|
2311 // to drain the marking data structures of the remaining entries |
f90b9bceb8e5
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|
2312 // added by the 'keep alive' oop closure above. |
f90b9bceb8e5
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2313 |
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2314 class G1CMDrainMarkingStackClosure: public VoidClosure { |
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2315 ConcurrentMark* _cm; |
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2316 CMTask* _task; |
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2317 bool _is_serial; |
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2318 public: |
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2319 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2320 _cm(cm), _task(task), _is_serial(is_serial) { |
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2321 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
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2322 } |
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2323 |
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2324 void do_void() { |
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2325 do { |
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2326 if (_cm->verbose_high()) { |
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2327 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
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2328 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
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2329 } |
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2330 |
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2331 // We call CMTask::do_marking_step() to completely drain the local |
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2332 // and global marking stacks of entries pushed by the 'keep alive' |
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2333 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
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2334 // |
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2335 // CMTask::do_marking_step() is called in a loop, which we'll exit |
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2336 // if there's nothing more to do (i.e. we'completely drained the |
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2337 // entries that were pushed as a a result of applying the 'keep alive' |
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2338 // closure to the entries on the discovered ref lists) or we overflow |
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2339 // the global marking stack. |
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2340 // |
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2341 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
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2342 // flag while there may still be some work to do. (See the comment at |
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2343 // the beginning of CMTask::do_marking_step() for those conditions - |
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2344 // one of which is reaching the specified time target.) It is only |
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2345 // when CMTask::do_marking_step() returns without setting the |
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2346 // has_aborted() flag that the marking step has completed. |
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2347 |
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2348 _task->do_marking_step(1000000000.0 /* something very large */, |
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2349 true /* do_termination */, |
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2350 _is_serial); |
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2351 } while (_task->has_aborted() && !_cm->has_overflown()); |
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2352 } |
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2353 }; |
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2354 |
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2355 // Implementation of AbstractRefProcTaskExecutor for parallel |
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2356 // reference processing at the end of G1 concurrent marking |
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2357 |
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2358 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
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2359 private: |
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2360 G1CollectedHeap* _g1h; |
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2361 ConcurrentMark* _cm; |
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2362 WorkGang* _workers; |
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|
2363 int _active_workers; |
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2364 |
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2365 public: |
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2366 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
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2367 ConcurrentMark* cm, |
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|
2368 WorkGang* workers, |
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|
2369 int n_workers) : |
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2370 _g1h(g1h), _cm(cm), |
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2371 _workers(workers), _active_workers(n_workers) { } |
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2372 |
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|
2373 // Executes the given task using concurrent marking worker threads. |
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|
2374 virtual void execute(ProcessTask& task); |
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|
2375 virtual void execute(EnqueueTask& task); |
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|
2376 }; |
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|
2377 |
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2378 class G1CMRefProcTaskProxy: public AbstractGangTask { |
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2379 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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|
2380 ProcessTask& _proc_task; |
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|
2381 G1CollectedHeap* _g1h; |
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|
2382 ConcurrentMark* _cm; |
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|
2383 |
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|
2384 public: |
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2385 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
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2386 G1CollectedHeap* g1h, |
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|
2387 ConcurrentMark* cm) : |
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|
2388 AbstractGangTask("Process reference objects in parallel"), |
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2389 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
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2390 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
2391 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
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2392 } |
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|
2393 |
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2394 virtual void work(uint worker_id) { |
20306
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|
2395 ResourceMark rm; |
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|
2396 HandleMark hm; |
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2397 CMTask* task = _cm->task(worker_id); |
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2398 G1CMIsAliveClosure g1_is_alive(_g1h); |
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2399 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
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2400 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
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2401 |
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2402 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
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2403 } |
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|
2404 }; |
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|
2405 |
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2406 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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2407 assert(_workers != NULL, "Need parallel worker threads."); |
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2408 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2409 |
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2410 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
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2411 |
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2412 // We need to reset the concurrency level before each |
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2413 // proxy task execution, so that the termination protocol |
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2414 // and overflow handling in CMTask::do_marking_step() knows |
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2415 // how many workers to wait for. |
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2416 _cm->set_concurrency(_active_workers); |
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2417 _g1h->set_par_threads(_active_workers); |
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2418 _workers->run_task(&proc_task_proxy); |
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2419 _g1h->set_par_threads(0); |
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|
2420 } |
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|
2421 |
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2422 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
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2423 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
2424 EnqueueTask& _enq_task; |
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|
2425 |
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|
2426 public: |
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2427 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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2428 AbstractGangTask("Enqueue reference objects in parallel"), |
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2429 _enq_task(enq_task) { } |
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2430 |
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2431 virtual void work(uint worker_id) { |
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2432 _enq_task.work(worker_id); |
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2433 } |
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|
2434 }; |
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|
2435 |
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2436 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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2437 assert(_workers != NULL, "Need parallel worker threads."); |
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|
2438 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
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2439 |
3979
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6484982: G1: process references during evacuation pauses
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|
2440 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
2441 |
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|
2442 // Not strictly necessary but... |
e864cc14ca75
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diff
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|
2443 // |
e864cc14ca75
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|
2444 // We need to reset the concurrency level before each |
e864cc14ca75
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|
2445 // proxy task execution, so that the termination protocol |
e864cc14ca75
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parents:
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diff
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|
2446 // and overflow handling in CMTask::do_marking_step() knows |
e864cc14ca75
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|
2447 // how many workers to wait for. |
e864cc14ca75
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|
2448 _cm->set_concurrency(_active_workers); |
2174
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|
2449 _g1h->set_par_threads(_active_workers); |
234761c55641
6608385: G1: need to support parallel reference processing
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|
2450 _workers->run_task(&enq_task_proxy); |
234761c55641
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2152
diff
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|
2451 _g1h->set_par_threads(0); |
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
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diff
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|
2452 } |
234761c55641
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diff
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|
2453 |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
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|
2454 void ConcurrentMark::weakRefsWorkParallelPart(BoolObjectClosure* is_alive, bool purged_classes) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2455 G1CollectedHeap::heap()->parallel_cleaning(is_alive, true, true, purged_classes); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
2456 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2457 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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20263
diff
changeset
|
2458 // Helper class to get rid of some boilerplate code. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
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|
2459 class G1RemarkGCTraceTime : public GCTraceTime { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
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|
2460 static bool doit_and_prepend(bool doit) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
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|
2461 if (doit) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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20263
diff
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|
2462 gclog_or_tty->put(' '); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
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|
2463 } |
2c6ef90f030a
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stefank
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20263
diff
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|
2464 return doit; |
2c6ef90f030a
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stefank
parents:
20263
diff
changeset
|
2465 } |
2c6ef90f030a
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stefank
parents:
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diff
changeset
|
2466 |
2c6ef90f030a
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stefank
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20263
diff
changeset
|
2467 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
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|
2468 G1RemarkGCTraceTime(const char* title, bool doit) |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
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|
2469 : GCTraceTime(title, doit_and_prepend(doit), false, G1CollectedHeap::heap()->gc_timer_cm(), |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
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|
2470 G1CollectedHeap::heap()->concurrent_mark()->concurrent_gc_id()) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
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|
2471 } |
2c6ef90f030a
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diff
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|
2472 }; |
2c6ef90f030a
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20263
diff
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|
2473 |
342 | 2474 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
8788
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parents:
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|
2475 if (has_overflown()) { |
e864cc14ca75
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diff
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|
2476 // Skip processing the discovered references if we have |
e864cc14ca75
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diff
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|
2477 // overflown the global marking stack. Reference objects |
e864cc14ca75
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parents:
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diff
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|
2478 // only get discovered once so it is OK to not |
e864cc14ca75
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johnc
parents:
8787
diff
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|
2479 // de-populate the discovered reference lists. We could have, |
e864cc14ca75
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parents:
8787
diff
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|
2480 // but the only benefit would be that, when marking restarts, |
e864cc14ca75
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|
2481 // less reference objects are discovered. |
e864cc14ca75
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diff
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|
2482 return; |
e864cc14ca75
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diff
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|
2483 } |
e864cc14ca75
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diff
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|
2484 |
342 | 2485 ResourceMark rm; |
2486 HandleMark hm; | |
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diff
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|
2487 |
1847b501ae74
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diff
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|
2488 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1847b501ae74
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|
2489 |
1847b501ae74
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diff
changeset
|
2490 // Is alive closure. |
1847b501ae74
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diff
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|
2491 G1CMIsAliveClosure g1_is_alive(g1h); |
1847b501ae74
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diff
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|
2492 |
1847b501ae74
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3914
diff
changeset
|
2493 // Inner scope to exclude the cleaning of the string and symbol |
1847b501ae74
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parents:
3914
diff
changeset
|
2494 // tables from the displayed time. |
1847b501ae74
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3914
diff
changeset
|
2495 { |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5988
diff
changeset
|
2496 if (G1Log::finer()) { |
3975
1847b501ae74
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parents:
3914
diff
changeset
|
2497 gclog_or_tty->put(' '); |
1847b501ae74
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3914
diff
changeset
|
2498 } |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
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diff
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|
2499 GCTraceTime t("GC ref-proc", G1Log::finer(), false, g1h->gc_timer_cm(), concurrent_gc_id()); |
3975
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|
2500 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
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|
2501 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
3975
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diff
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|
2502 |
1847b501ae74
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diff
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|
2503 // See the comment in G1CollectedHeap::ref_processing_init() |
1847b501ae74
7068215: G1: Print reference processing time during remark
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parents:
3914
diff
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|
2504 // about how reference processing currently works in G1. |
1847b501ae74
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parents:
3914
diff
changeset
|
2505 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
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8008
diff
changeset
|
2506 // Set the soft reference policy |
3975
1847b501ae74
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parents:
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diff
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|
2507 rp->setup_policy(clear_all_soft_refs); |
1847b501ae74
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parents:
3914
diff
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|
2508 assert(_markStack.isEmpty(), "mark stack should be empty"); |
1847b501ae74
7068215: G1: Print reference processing time during remark
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parents:
3914
diff
changeset
|
2509 |
8787
fa08949fe0cb
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diff
changeset
|
2510 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2511 // in serial reference processing. Note these closures are also |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2512 // used for serially processing (by the the current thread) the |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2513 // JNI references during parallel reference processing. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2514 // |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2515 // These closures do not need to synchronize with the worker |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2516 // threads involved in parallel reference processing as these |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2517 // instances are executed serially by the current thread (e.g. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2518 // reference processing is not multi-threaded and is thus |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2519 // performed by the current thread instead of a gang worker). |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2520 // |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2521 // The gang tasks involved in parallel reference procssing create |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2522 // their own instances of these closures, which do their own |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2523 // synchronization among themselves. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2524 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2525 G1CMDrainMarkingStackClosure g1_drain_mark_stack(this, task(0), true /* is_serial */); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2526 |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2527 // We need at least one active thread. If reference processing |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2528 // is not multi-threaded we use the current (VMThread) thread, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2529 // otherwise we use the work gang from the G1CollectedHeap and |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2530 // we utilize all the worker threads we can. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2531 bool processing_is_mt = rp->processing_is_mt() && g1h->workers() != NULL; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2532 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
|
2533 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
3975
1847b501ae74
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|
2534 |
8787
fa08949fe0cb
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diff
changeset
|
2535 // Parallel processing task executor. |
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2536 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3977
diff
changeset
|
2537 g1h->workers(), active_workers); |
8787
fa08949fe0cb
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parents:
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diff
changeset
|
2538 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
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|
2539 |
8788
e864cc14ca75
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parents:
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diff
changeset
|
2540 // Set the concurrency level. The phase was already set prior to |
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
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8787
diff
changeset
|
2541 // executing the remark task. |
e864cc14ca75
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diff
changeset
|
2542 set_concurrency(active_workers); |
e864cc14ca75
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|
2543 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2544 // 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
|
2545 // the number of threads involved during discovery could differ from |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
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diff
changeset
|
2546 // the number of active workers. This is OK as long as the discovered |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
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|
2547 // 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
|
2548 rp->set_active_mt_degree(active_workers); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
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diff
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|
2549 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2550 // Process the weak references. |
10405 | 2551 const ReferenceProcessorStats& stats = |
2552 rp->process_discovered_references(&g1_is_alive, | |
2553 &g1_keep_alive, | |
2554 &g1_drain_mark_stack, | |
2555 executor, | |
20190
0982ec23da03
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brutisso
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|
2556 g1h->gc_timer_cm(), |
0982ec23da03
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brutisso
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diff
changeset
|
2557 concurrent_gc_id()); |
10405 | 2558 g1h->gc_tracer_cm()->report_gc_reference_stats(stats); |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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|
2559 |
f90b9bceb8e5
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diff
changeset
|
2560 // 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:
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diff
changeset
|
2561 // 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
|
2562 // global marking stack. |
3975
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changeset
|
2563 |
1847b501ae74
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diff
changeset
|
2564 assert(_markStack.overflow() || _markStack.isEmpty(), |
1847b501ae74
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diff
changeset
|
2565 "mark stack should be empty (unless it overflowed)"); |
8787
fa08949fe0cb
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|
2566 |
3975
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changeset
|
2567 if (_markStack.overflow()) { |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2568 // This should have been done already when we tried to push an |
3975
1847b501ae74
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parents:
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diff
changeset
|
2569 // entry on to the global mark stack. But let's do it again. |
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parents:
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diff
changeset
|
2570 set_has_overflown(); |
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3914
diff
changeset
|
2571 } |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2572 |
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2573 assert(rp->num_q() == active_workers, "why not"); |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2574 |
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2575 rp->enqueue_discovered_references(executor); |
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2576 |
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2577 rp->verify_no_references_recorded(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2578 assert(!rp->discovery_enabled(), "Post condition"); |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2579 } |
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2580 |
17750
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2581 if (has_overflown()) { |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2582 // 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
|
2583 return; |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2584 } |
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2585 |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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changeset
|
2586 assert(_markStack.isEmpty(), "Marking should have completed"); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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changeset
|
2587 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2588 // Unload Klasses, String, Symbols, Code Cache, etc. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2589 { |
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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diff
changeset
|
2590 G1RemarkGCTraceTime trace("Unloading", G1Log::finer()); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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changeset
|
2591 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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diff
changeset
|
2592 if (ClassUnloadingWithConcurrentMark) { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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changeset
|
2593 bool purged_classes; |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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changeset
|
2594 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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changeset
|
2595 { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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changeset
|
2596 G1RemarkGCTraceTime trace("System Dictionary Unloading", G1Log::finest()); |
f3aeae1f9fc5
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|
2597 purged_classes = SystemDictionary::do_unloading(&g1_is_alive); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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|
2598 } |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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diff
changeset
|
2599 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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diff
changeset
|
2600 { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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changeset
|
2601 G1RemarkGCTraceTime trace("Parallel Unloading", G1Log::finest()); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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|
2602 weakRefsWorkParallelPart(&g1_is_alive, purged_classes); |
f3aeae1f9fc5
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stefank
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changeset
|
2603 } |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
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diff
changeset
|
2604 } |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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diff
changeset
|
2605 |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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diff
changeset
|
2606 if (G1StringDedup::is_enabled()) { |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
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changeset
|
2607 G1RemarkGCTraceTime trace("String Deduplication Unlink", G1Log::finest()); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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changeset
|
2608 G1StringDedup::unlink(&g1_is_alive); |
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
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diff
changeset
|
2609 } |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
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|
2610 } |
342 | 2611 } |
2612 | |
2613 void ConcurrentMark::swapMarkBitMaps() { | |
2614 CMBitMapRO* temp = _prevMarkBitMap; | |
2615 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
2616 _nextMarkBitMap = (CMBitMap*) temp; | |
2617 } | |
2618 | |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
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|
2619 class CMObjectClosure; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2620 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2621 // Closure for iterating over objects, currently only used for |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2622 // processing SATB buffers. |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2623 class CMObjectClosure : public ObjectClosure { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2624 private: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2625 CMTask* _task; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2626 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2627 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2628 void do_object(oop obj) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2629 _task->deal_with_reference(obj); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2630 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2631 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2632 CMObjectClosure(CMTask* task) : _task(task) { } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2633 }; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2634 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2635 class G1RemarkThreadsClosure : public ThreadClosure { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2636 CMObjectClosure _cm_obj; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2637 G1CMOopClosure _cm_cl; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2638 MarkingCodeBlobClosure _code_cl; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2639 int _thread_parity; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2640 bool _is_par; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2641 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2642 public: |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2643 G1RemarkThreadsClosure(G1CollectedHeap* g1h, CMTask* task, bool is_par) : |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2644 _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
|
2645 _thread_parity(SharedHeap::heap()->strong_roots_parity()), _is_par(is_par) {} |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2646 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2647 void do_thread(Thread* thread) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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parents:
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diff
changeset
|
2648 if (thread->is_Java_thread()) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2649 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
|
2650 JavaThread* jt = (JavaThread*)thread; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2651 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2652 // 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
|
2653 // 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
|
2654 // * 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
|
2655 // * Weakly reachable otherwise |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2656 // 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
|
2657 // 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
|
2658 jt->nmethods_do(&_code_cl); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2659 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2660 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
|
2661 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2662 } else if (thread->is_VM_thread()) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2663 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2664 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
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diff
changeset
|
2665 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2666 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2667 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2668 }; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2669 |
342 | 2670 class CMRemarkTask: public AbstractGangTask { |
2671 private: | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2672 ConcurrentMark* _cm; |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2673 bool _is_serial; |
342 | 2674 public: |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2675 void work(uint worker_id) { |
342 | 2676 // Since all available tasks are actually started, we should |
2677 // 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
|
2678 if (worker_id < _cm->active_tasks()) { |
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
2679 CMTask* task = _cm->task(worker_id); |
342 | 2680 task->record_start_time(); |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2681 { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2682 ResourceMark rm; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2683 HandleMark hm; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2684 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2685 G1RemarkThreadsClosure threads_f(G1CollectedHeap::heap(), task, !_is_serial); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2686 Threads::threads_do(&threads_f); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2687 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
2688 |
342 | 2689 do { |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2690 task->do_marking_step(1000000000.0 /* something very large */, |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2691 true /* do_termination */, |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
2692 _is_serial); |
342 | 2693 } while (task->has_aborted() && !_cm->has_overflown()); |
2694 // If we overflow, then we do not want to restart. We instead | |
2695 // want to abort remark and do concurrent marking again. | |
2696 task->record_end_time(); | |
2697 } | |
2698 } | |
2699 | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2700 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2701 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
4711 | 2702 _cm->terminator()->reset_for_reuse(active_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2703 } |
342 | 2704 }; |
2705 | |
2706 void ConcurrentMark::checkpointRootsFinalWork() { | |
2707 ResourceMark rm; | |
2708 HandleMark hm; | |
2709 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
2710 | |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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changeset
|
2711 G1RemarkGCTraceTime trace("Finalize Marking", G1Log::finer()); |
2c6ef90f030a
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changeset
|
2712 |
342 | 2713 g1h->ensure_parsability(false); |
2714 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2715 if (G1CollectedHeap::use_parallel_gc_threads()) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
912
diff
changeset
|
2716 G1CollectedHeap::StrongRootsScope srs(g1h); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2717 // 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
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4711
diff
changeset
|
2718 uint active_workers = g1h->workers()->active_workers(); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4093
diff
changeset
|
2719 if (active_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2720 assert(active_workers > 0, "Should have been set earlier"); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2721 active_workers = (uint) ParallelGCThreads; |
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2722 g1h->workers()->set_active_workers(active_workers); |
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2723 } |
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2724 set_concurrency_and_phase(active_workers, false /* concurrent */); |
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2725 // Leave _parallel_marking_threads at it's |
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2726 // value originally calculated in the ConcurrentMark |
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2727 // constructor and pass values of the active workers |
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2728 // through the gang in the task. |
342 | 2729 |
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2730 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
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2731 // We will start all available threads, even if we decide that the |
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2732 // active_workers will be fewer. The extra ones will just bail out |
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2733 // immediately. |
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2734 g1h->set_par_threads(active_workers); |
342 | 2735 g1h->workers()->run_task(&remarkTask); |
2736 g1h->set_par_threads(0); | |
2737 } else { | |
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2738 G1CollectedHeap::StrongRootsScope srs(g1h); |
4728
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2739 uint active_workers = 1; |
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2740 set_concurrency_and_phase(active_workers, false /* concurrent */); |
342 | 2741 |
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2742 // Note - if there's no work gang then the VMThread will be |
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2743 // the thread to execute the remark - serially. We have |
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2744 // to pass true for the is_serial parameter so that |
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2745 // CMTask::do_marking_step() doesn't enter the sync |
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2746 // barriers in the event of an overflow. Doing so will |
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2747 // cause an assert that the current thread is not a |
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|
2748 // concurrent GC thread. |
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|
2749 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
342 | 2750 remarkTask.work(0); |
2751 } | |
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2752 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
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2753 guarantee(has_overflown() || |
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2754 satb_mq_set.completed_buffers_num() == 0, |
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2755 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
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2756 BOOL_TO_STR(has_overflown()), |
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2757 satb_mq_set.completed_buffers_num())); |
342 | 2758 |
2759 print_stats(); | |
2760 } | |
2761 | |
1044 | 2762 #ifndef PRODUCT |
2763 | |
1388 | 2764 class PrintReachableOopClosure: public OopClosure { |
342 | 2765 private: |
2766 G1CollectedHeap* _g1h; | |
2767 outputStream* _out; | |
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2768 VerifyOption _vo; |
1388 | 2769 bool _all; |
342 | 2770 |
2771 public: | |
3772
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2772 PrintReachableOopClosure(outputStream* out, |
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2773 VerifyOption vo, |
1388 | 2774 bool all) : |
1044 | 2775 _g1h(G1CollectedHeap::heap()), |
3772
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2776 _out(out), _vo(vo), _all(all) { } |
342 | 2777 |
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2778 void do_oop(narrowOop* p) { do_oop_work(p); } |
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2779 void do_oop( oop* p) { do_oop_work(p); } |
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|
2780 |
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2781 template <class T> void do_oop_work(T* p) { |
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2782 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 2783 const char* str = NULL; |
2784 const char* str2 = ""; | |
2785 | |
1388 | 2786 if (obj == NULL) { |
2787 str = ""; | |
2788 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
2789 str = " O"; | |
2790 } else { | |
342 | 2791 HeapRegion* hr = _g1h->heap_region_containing(obj); |
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2792 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
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2793 bool marked = _g1h->is_marked(obj, _vo); |
1044 | 2794 |
2795 if (over_tams) { | |
1388 | 2796 str = " >"; |
2797 if (marked) { | |
342 | 2798 str2 = " AND MARKED"; |
1044 | 2799 } |
1388 | 2800 } else if (marked) { |
2801 str = " M"; | |
1044 | 2802 } else { |
1388 | 2803 str = " NOT"; |
1044 | 2804 } |
342 | 2805 } |
2806 | |
1388 | 2807 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
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|
2808 p2i(p), p2i((void*) obj), str, str2); |
342 | 2809 } |
2810 }; | |
2811 | |
1388 | 2812 class PrintReachableObjectClosure : public ObjectClosure { |
342 | 2813 private: |
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|
2814 G1CollectedHeap* _g1h; |
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|
2815 outputStream* _out; |
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|
2816 VerifyOption _vo; |
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|
2817 bool _all; |
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|
2818 HeapRegion* _hr; |
342 | 2819 |
2820 public: | |
3772
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|
2821 PrintReachableObjectClosure(outputStream* out, |
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|
2822 VerifyOption vo, |
1388 | 2823 bool all, |
2824 HeapRegion* hr) : | |
3772
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|
2825 _g1h(G1CollectedHeap::heap()), |
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|
2826 _out(out), _vo(vo), _all(all), _hr(hr) { } |
1388 | 2827 |
2828 void do_object(oop o) { | |
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2829 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
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|
2830 bool marked = _g1h->is_marked(o, _vo); |
1388 | 2831 bool print_it = _all || over_tams || marked; |
2832 | |
2833 if (print_it) { | |
2834 _out->print_cr(" "PTR_FORMAT"%s", | |
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|
2835 p2i((void *)o), (over_tams) ? " >" : (marked) ? " M" : ""); |
3772
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|
2836 PrintReachableOopClosure oopCl(_out, _vo, _all); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
2837 o->oop_iterate_no_header(&oopCl); |
1388 | 2838 } |
342 | 2839 } |
2840 }; | |
2841 | |
1388 | 2842 class PrintReachableRegionClosure : public HeapRegionClosure { |
342 | 2843 private: |
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|
2844 G1CollectedHeap* _g1h; |
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|
2845 outputStream* _out; |
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|
2846 VerifyOption _vo; |
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|
2847 bool _all; |
342 | 2848 |
2849 public: | |
2850 bool doHeapRegion(HeapRegion* hr) { | |
2851 HeapWord* b = hr->bottom(); | |
2852 HeapWord* e = hr->end(); | |
2853 HeapWord* t = hr->top(); | |
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|
2854 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
342 | 2855 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
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|
2856 "TAMS: " PTR_FORMAT, p2i(b), p2i(e), p2i(t), p2i(p)); |
1388 | 2857 _out->cr(); |
2858 | |
2859 HeapWord* from = b; | |
2860 HeapWord* to = t; | |
2861 | |
2862 if (to > from) { | |
17937
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diff
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|
2863 _out->print_cr("Objects in [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(from), p2i(to)); |
1388 | 2864 _out->cr(); |
3772
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|
2865 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
1388 | 2866 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
2867 _out->cr(); | |
2868 } | |
342 | 2869 |
2870 return false; | |
2871 } | |
2872 | |
3772
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|
2873 PrintReachableRegionClosure(outputStream* out, |
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|
2874 VerifyOption vo, |
1388 | 2875 bool all) : |
6254
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|
2876 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
342 | 2877 }; |
2878 | |
1388 | 2879 void ConcurrentMark::print_reachable(const char* str, |
3772
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|
2880 VerifyOption vo, |
1388 | 2881 bool all) { |
2882 gclog_or_tty->cr(); | |
2883 gclog_or_tty->print_cr("== Doing heap dump... "); | |
1044 | 2884 |
2885 if (G1PrintReachableBaseFile == NULL) { | |
2886 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
2887 return; | |
2888 } | |
2889 | |
2890 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
2891 (JVM_MAXPATHLEN - 1)) { | |
2892 gclog_or_tty->print_cr(" #### error: file name too long"); | |
2893 return; | |
2894 } | |
2895 | |
2896 char file_name[JVM_MAXPATHLEN]; | |
2897 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
2898 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
2899 | |
2900 fileStream fout(file_name); | |
2901 if (!fout.is_open()) { | |
2902 gclog_or_tty->print_cr(" #### error: could not open file"); | |
2903 return; | |
2904 } | |
2905 | |
2906 outputStream* out = &fout; | |
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|
2907 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
1044 | 2908 out->cr(); |
2909 | |
1388 | 2910 out->print_cr("--- ITERATING OVER REGIONS"); |
1044 | 2911 out->cr(); |
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|
2912 PrintReachableRegionClosure rcl(out, vo, all); |
1388 | 2913 _g1h->heap_region_iterate(&rcl); |
1044 | 2914 out->cr(); |
2915 | |
2916 gclog_or_tty->print_cr(" done"); | |
1388 | 2917 gclog_or_tty->flush(); |
342 | 2918 } |
2919 | |
1044 | 2920 #endif // PRODUCT |
2921 | |
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|
2922 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
342 | 2923 // Note we are overriding the read-only view of the prev map here, via |
2924 // the cast. | |
2925 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
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|
2926 } |
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|
2927 |
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|
2928 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
342 | 2929 _nextMarkBitMap->clearRange(mr); |
2930 } | |
2931 | |
2932 HeapRegion* | |
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|
2933 ConcurrentMark::claim_region(uint worker_id) { |
342 | 2934 // "checkpoint" the finger |
2935 HeapWord* finger = _finger; | |
2936 | |
2937 // _heap_end will not change underneath our feet; it only changes at | |
2938 // yield points. | |
2939 while (finger < _heap_end) { | |
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|
2940 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
342 | 2941 |
3771 | 2942 // Note on how this code handles humongous regions. In the |
2943 // normal case the finger will reach the start of a "starts | |
2944 // humongous" (SH) region. Its end will either be the end of the | |
2945 // last "continues humongous" (CH) region in the sequence, or the | |
2946 // standard end of the SH region (if the SH is the only region in | |
2947 // the sequence). That way claim_region() will skip over the CH | |
2948 // regions. However, there is a subtle race between a CM thread | |
2949 // executing this method and a mutator thread doing a humongous | |
2950 // object allocation. The two are not mutually exclusive as the CM | |
2951 // thread does not need to hold the Heap_lock when it gets | |
2952 // here. So there is a chance that claim_region() will come across | |
2953 // a free region that's in the progress of becoming a SH or a CH | |
2954 // region. In the former case, it will either | |
2955 // a) Miss the update to the region's end, in which case it will | |
2956 // visit every subsequent CH region, will find their bitmaps | |
2957 // empty, and do nothing, or | |
2958 // b) Will observe the update of the region's end (in which case | |
2959 // it will skip the subsequent CH regions). | |
2960 // If it comes across a region that suddenly becomes CH, the | |
2961 // scenario will be similar to b). So, the race between | |
2962 // claim_region() and a humongous object allocation might force us | |
2963 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
2964 // iterations) but it should not introduce and correctness issues. | |
20337 | 2965 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); |
2966 | |
2967 // Above heap_region_containing_raw may return NULL as we always scan claim | |
2968 // until the end of the heap. In this case, just jump to the next region. | |
2969 HeapWord* end = curr_region != NULL ? curr_region->end() : finger + HeapRegion::GrainWords; | |
3771 | 2970 |
2971 // Is the gap between reading the finger and doing the CAS too long? | |
2972 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
20337 | 2973 if (res == finger && curr_region != NULL) { |
342 | 2974 // we succeeded |
20337 | 2975 HeapWord* bottom = curr_region->bottom(); |
2976 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
2977 | |
2978 if (verbose_low()) { | |
2979 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " | |
2980 "["PTR_FORMAT", "PTR_FORMAT"), " | |
2981 "limit = "PTR_FORMAT, | |
2982 worker_id, p2i(curr_region), p2i(bottom), p2i(end), p2i(limit)); | |
2983 } | |
342 | 2984 |
2985 // notice that _finger == end cannot be guaranteed here since, | |
2986 // someone else might have moved the finger even further | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
2987 assert(_finger >= end, "the finger should have moved forward"); |
342 | 2988 |
3776
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|
2989 if (verbose_low()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
2990 gclog_or_tty->print_cr("[%u] we were successful with region = " |
17937
78bbf4d43a14
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|
2991 PTR_FORMAT, worker_id, p2i(curr_region)); |
3776
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|
2992 } |
342 | 2993 |
2994 if (limit > bottom) { | |
3776
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|
2995 if (verbose_low()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
2996 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
17937
78bbf4d43a14
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|
2997 "returning it ", worker_id, p2i(curr_region)); |
3776
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|
2998 } |
342 | 2999 return curr_region; |
3000 } else { | |
1023
11d4857fe5e1
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|
3001 assert(limit == bottom, |
11d4857fe5e1
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|
3002 "the region limit should be at bottom"); |
3776
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|
3003 if (verbose_low()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
3004 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
17937
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|
3005 "returning NULL", worker_id, p2i(curr_region)); |
3776
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|
3006 } |
342 | 3007 // we return NULL and the caller should try calling |
3008 // claim_region() again. | |
3009 return NULL; | |
3010 } | |
3011 } else { | |
1023
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|
3012 assert(_finger > finger, "the finger should have moved forward"); |
3776
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|
3013 if (verbose_low()) { |
20337 | 3014 if (curr_region == NULL) { |
3015 gclog_or_tty->print_cr("[%u] found uncommitted region, moving finger, " | |
3016 "global finger = "PTR_FORMAT", " | |
3017 "our finger = "PTR_FORMAT, | |
3018 worker_id, p2i(_finger), p2i(finger)); | |
3019 } else { | |
3020 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " | |
3021 "global finger = "PTR_FORMAT", " | |
3022 "our finger = "PTR_FORMAT, | |
3023 worker_id, p2i(_finger), p2i(finger)); | |
3024 } | |
3776
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|
3025 } |
342 | 3026 |
3027 // read it again | |
3028 finger = _finger; | |
3029 } | |
3030 } | |
3031 | |
3032 return NULL; | |
3033 } | |
3034 | |
4787
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|
3035 #ifndef PRODUCT |
2ace1c4ee8da
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|
3036 enum VerifyNoCSetOopsPhase { |
2ace1c4ee8da
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|
3037 VerifyNoCSetOopsStack, |
2ace1c4ee8da
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|
3038 VerifyNoCSetOopsQueues, |
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|
3039 VerifyNoCSetOopsSATBCompleted, |
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|
3040 VerifyNoCSetOopsSATBThread |
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|
3041 }; |
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|
3042 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3043 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
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|
3044 private: |
2ace1c4ee8da
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|
3045 G1CollectedHeap* _g1h; |
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|
3046 VerifyNoCSetOopsPhase _phase; |
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|
3047 int _info; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3048 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3049 const char* phase_str() { |
2ace1c4ee8da
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|
3050 switch (_phase) { |
2ace1c4ee8da
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|
3051 case VerifyNoCSetOopsStack: return "Stack"; |
2ace1c4ee8da
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|
3052 case VerifyNoCSetOopsQueues: return "Queue"; |
2ace1c4ee8da
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|
3053 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
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|
3054 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
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diff
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|
3055 default: ShouldNotReachHere(); |
2ace1c4ee8da
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|
3056 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3057 return NULL; |
2ace1c4ee8da
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parents:
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diff
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|
3058 } |
2ace1c4ee8da
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diff
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|
3059 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3060 void do_object_work(oop obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3061 guarantee(!_g1h->obj_in_cs(obj), |
2ace1c4ee8da
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|
3062 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
17937
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|
3063 p2i((void*) obj), phase_str(), _info)); |
4787
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|
3064 } |
2ace1c4ee8da
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|
3065 |
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|
3066 public: |
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diff
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|
3067 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
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|
3068 |
2ace1c4ee8da
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diff
changeset
|
3069 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
2ace1c4ee8da
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parents:
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diff
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|
3070 _phase = phase; |
2ace1c4ee8da
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diff
changeset
|
3071 _info = info; |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3072 } |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3073 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
changeset
|
3074 virtual void do_oop(oop* p) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3075 oop obj = oopDesc::load_decode_heap_oop(p); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3076 do_object_work(obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3077 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3078 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3079 virtual void do_oop(narrowOop* p) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3080 // We should not come across narrow oops while scanning marking |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3081 // stacks and SATB buffers. |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3082 ShouldNotReachHere(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3083 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3084 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3085 virtual void do_object(oop obj) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3086 do_object_work(obj); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3087 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3088 }; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3089 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3090 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
3091 bool verify_enqueued_buffers, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3092 bool verify_thread_buffers, |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3093 bool verify_fingers) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3094 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3095 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
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|
3096 return; |
342 | 3097 } |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3098 |
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
3099 VerifyNoCSetOopsClosure cl; |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3100 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3101 if (verify_stacks) { |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3102 // Verify entries on the global mark stack |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3103 cl.set_phase(VerifyNoCSetOopsStack); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3104 _markStack.oops_do(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
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|
3105 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
3106 // Verify entries on the task queues |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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diff
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|
3107 for (uint i = 0; i < _max_worker_id; i += 1) { |
4787
2ace1c4ee8da
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tonyp
parents:
4783
diff
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|
3108 cl.set_phase(VerifyNoCSetOopsQueues, i); |
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
3109 CMTaskQueue* queue = _task_queues->queue(i); |
4787
2ace1c4ee8da
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parents:
4783
diff
changeset
|
3110 queue->oops_do(&cl); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3111 } |
2ace1c4ee8da
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parents:
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diff
changeset
|
3112 } |
2ace1c4ee8da
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diff
changeset
|
3113 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3114 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
3115 |
2ace1c4ee8da
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diff
changeset
|
3116 // Verify entries on the enqueued SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
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|
3117 if (verify_enqueued_buffers) { |
2ace1c4ee8da
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diff
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|
3118 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3119 satb_qs.iterate_completed_buffers_read_only(&cl); |
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3120 } |
2ace1c4ee8da
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tonyp
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diff
changeset
|
3121 |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
3122 // Verify entries on the per-thread SATB buffers |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4783
diff
changeset
|
3123 if (verify_thread_buffers) { |
2ace1c4ee8da
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diff
changeset
|
3124 cl.set_phase(VerifyNoCSetOopsSATBThread); |
2ace1c4ee8da
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4783
diff
changeset
|
3125 satb_qs.iterate_thread_buffers_read_only(&cl); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
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|
3126 } |
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
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1833
diff
changeset
|
3127 |
4787
2ace1c4ee8da
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diff
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|
3128 if (verify_fingers) { |
2ace1c4ee8da
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parents:
4783
diff
changeset
|
3129 // Verify the global finger |
2ace1c4ee8da
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diff
changeset
|
3130 HeapWord* global_finger = finger(); |
2ace1c4ee8da
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|
3131 if (global_finger != NULL && global_finger < _heap_end) { |
2ace1c4ee8da
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parents:
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diff
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|
3132 // The global finger always points to a heap region boundary. We |
2ace1c4ee8da
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diff
changeset
|
3133 // use heap_region_containing_raw() to get the containing region |
2ace1c4ee8da
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tonyp
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diff
changeset
|
3134 // given that the global finger could be pointing to a free region |
2ace1c4ee8da
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diff
changeset
|
3135 // which subsequently becomes continues humongous. If that |
2ace1c4ee8da
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tonyp
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diff
changeset
|
3136 // happens, heap_region_containing() will return the bottom of the |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3137 // corresponding starts humongous region and the check below will |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3138 // not hold any more. |
20337 | 3139 // Since we always iterate over all regions, we might get a NULL HeapRegion |
3140 // here. | |
4787
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|
3141 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
20337 | 3142 guarantee(global_hr == NULL || global_finger == global_hr->bottom(), |
4787
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|
3143 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
17937
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parents:
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|
3144 p2i(global_finger), HR_FORMAT_PARAMS(global_hr))); |
4787
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|
3145 } |
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3146 |
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3147 // Verify the task fingers |
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|
3148 assert(parallel_marking_threads() <= _max_worker_id, "sanity"); |
4787
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|
3149 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
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|
3150 CMTask* task = _tasks[i]; |
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|
3151 HeapWord* task_finger = task->finger(); |
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diff
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|
3152 if (task_finger != NULL && task_finger < _heap_end) { |
2ace1c4ee8da
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|
3153 // See above note on the global finger verification. |
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|
3154 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
20337 | 3155 guarantee(task_hr == NULL || task_finger == task_hr->bottom() || |
4787
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|
3156 !task_hr->in_collection_set(), |
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|
3157 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
17937
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|
3158 p2i(task_finger), HR_FORMAT_PARAMS(task_hr))); |
4787
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|
3159 } |
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|
3160 } |
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|
3161 } |
342 | 3162 } |
4787
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|
3163 #endif // PRODUCT |
342 | 3164 |
4836
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|
3165 // Aggregate the counting data that was constructed concurrently |
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|
3166 // with marking. |
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|
3167 class AggregateCountDataHRClosure: public HeapRegionClosure { |
6812
988bf00cc564
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|
3168 G1CollectedHeap* _g1h; |
4836
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|
3169 ConcurrentMark* _cm; |
6812
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|
3170 CardTableModRefBS* _ct_bs; |
4836
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|
3171 BitMap* _cm_card_bm; |
6862
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|
3172 uint _max_worker_id; |
4836
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|
3173 |
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|
3174 public: |
6812
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|
3175 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
4836
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|
3176 BitMap* cm_card_bm, |
6862
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|
3177 uint max_worker_id) : |
6812
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|
3178 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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|
3179 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
6862
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|
3180 _cm_card_bm(cm_card_bm), _max_worker_id(max_worker_id) { } |
4836
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|
3181 |
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|
3182 bool doHeapRegion(HeapRegion* hr) { |
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|
3183 if (hr->continuesHumongous()) { |
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|
3184 // We will ignore these here and process them when their |
d30fa85f9994
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|
3185 // associated "starts humongous" region is processed. |
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|
3186 // Note that we cannot rely on their associated |
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|
3187 // "starts humongous" region to have their bit set to 1 |
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|
3188 // since, due to the region chunking in the parallel region |
d30fa85f9994
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|
3189 // iteration, a "continues humongous" region might be visited |
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|
3190 // before its associated "starts humongous". |
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|
3191 return false; |
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|
3192 } |
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|
3193 |
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|
3194 HeapWord* start = hr->bottom(); |
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|
3195 HeapWord* limit = hr->next_top_at_mark_start(); |
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|
3196 HeapWord* end = hr->end(); |
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|
3197 |
d30fa85f9994
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|
3198 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
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|
3199 err_msg("Preconditions not met - " |
d30fa85f9994
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|
3200 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
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|
3201 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
17937
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drchase
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diff
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|
3202 p2i(start), p2i(limit), p2i(hr->top()), p2i(hr->end()))); |
4836
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|
3203 |
d30fa85f9994
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diff
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|
3204 assert(hr->next_marked_bytes() == 0, "Precondition"); |
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|
3205 |
d30fa85f9994
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diff
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|
3206 if (start == limit) { |
d30fa85f9994
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diff
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|
3207 // NTAMS of this region has not been set so nothing to do. |
d30fa85f9994
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diff
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|
3208 return false; |
d30fa85f9994
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parents:
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diff
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|
3209 } |
d30fa85f9994
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|
3210 |
6812
988bf00cc564
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6750
diff
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|
3211 // 'start' should be in the heap. |
988bf00cc564
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parents:
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diff
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|
3212 assert(_g1h->is_in_g1_reserved(start) && _ct_bs->is_card_aligned(start), "sanity"); |
988bf00cc564
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|
3213 // 'end' *may* be just beyone the end of the heap (if hr is the last region) |
988bf00cc564
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parents:
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|
3214 assert(!_g1h->is_in_g1_reserved(end) || _ct_bs->is_card_aligned(end), "sanity"); |
4836
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|
3215 |
d30fa85f9994
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diff
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|
3216 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
d30fa85f9994
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|
3217 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
d30fa85f9994
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|
3218 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
d30fa85f9994
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|
3219 |
6812
988bf00cc564
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diff
changeset
|
3220 // If ntams is not card aligned then we bump card bitmap index |
988bf00cc564
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johnc
parents:
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diff
changeset
|
3221 // for limit so that we get the all the cards spanned by |
988bf00cc564
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johnc
parents:
6750
diff
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|
3222 // the object ending at ntams. |
988bf00cc564
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diff
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|
3223 // Note: if this is the last region in the heap then ntams |
988bf00cc564
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diff
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|
3224 // could be actually just beyond the end of the the heap; |
988bf00cc564
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diff
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|
3225 // limit_idx will then correspond to a (non-existent) card |
988bf00cc564
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diff
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|
3226 // that is also outside the heap. |
988bf00cc564
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diff
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|
3227 if (_g1h->is_in_g1_reserved(limit) && !_ct_bs->is_card_aligned(limit)) { |
4836
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diff
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|
3228 limit_idx += 1; |
d30fa85f9994
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parents:
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diff
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|
3229 } |
d30fa85f9994
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diff
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|
3230 |
d30fa85f9994
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diff
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|
3231 assert(limit_idx <= end_idx, "or else use atomics"); |
d30fa85f9994
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|
3232 |
d30fa85f9994
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diff
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|
3233 // Aggregate the "stripe" in the count data associated with hr. |
20377
a8ea2f110d87
8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
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20337
diff
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|
3234 uint hrm_index = hr->hrm_index(); |
4836
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diff
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|
3235 size_t marked_bytes = 0; |
d30fa85f9994
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|
3236 |
6862
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diff
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|
3237 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
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|
3238 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
d30fa85f9994
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|
3239 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
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|
3240 |
d30fa85f9994
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diff
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|
3241 // Fetch the marked_bytes in this region for task i and |
d30fa85f9994
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|
3242 // add it to the running total for this region. |
20377
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8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
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20337
diff
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|
3243 marked_bytes += marked_bytes_array[hrm_index]; |
4836
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|
3244 |
6862
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diff
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|
3245 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
4836
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diff
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|
3246 // into the global card bitmap. |
d30fa85f9994
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diff
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|
3247 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
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|
3248 |
d30fa85f9994
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|
3249 while (scan_idx < limit_idx) { |
d30fa85f9994
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|
3250 assert(task_card_bm->at(scan_idx) == true, "should be"); |
d30fa85f9994
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|
3251 _cm_card_bm->set_bit(scan_idx); |
d30fa85f9994
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|
3252 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
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|
3253 |
d30fa85f9994
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|
3254 // BitMap::get_next_one_offset() can handle the case when |
d30fa85f9994
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|
3255 // its left_offset parameter is greater than its right_offset |
6812
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diff
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|
3256 // parameter. It does, however, have an early exit if |
4836
d30fa85f9994
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|
3257 // left_offset == right_offset. So let's limit the value |
d30fa85f9994
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diff
changeset
|
3258 // passed in for left offset here. |
d30fa85f9994
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|
3259 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
d30fa85f9994
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|
3260 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3261 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3262 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3263 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3264 // Update the marked bytes for this region. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3265 hr->add_to_marked_bytes(marked_bytes); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3266 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3267 // Next heap region |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3268 return false; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3269 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3270 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3271 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3272 class G1AggregateCountDataTask: public AbstractGangTask { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3273 protected: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3274 G1CollectedHeap* _g1h; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3275 ConcurrentMark* _cm; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3276 BitMap* _cm_card_bm; |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3277 uint _max_worker_id; |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3278 int _active_workers; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3279 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3280 public: |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3281 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3282 ConcurrentMark* cm, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3283 BitMap* cm_card_bm, |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3284 uint max_worker_id, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3285 int n_workers) : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3286 AbstractGangTask("Count Aggregation"), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3287 _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
|
3288 _max_worker_id(max_worker_id), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3289 _active_workers(n_workers) { } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3290 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3291 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
|
3292 AggregateCountDataHRClosure cl(_g1h, _cm_card_bm, _max_worker_id); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3293 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3294 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3295 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3296 _active_workers, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3297 HeapRegion::AggregateCountClaimValue); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3298 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3299 _g1h->heap_region_iterate(&cl); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3300 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3301 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3302 }; |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3303 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3304 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3305 void ConcurrentMark::aggregate_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3306 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3307 _g1h->workers()->active_workers() : |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3308 1); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3309 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3310 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
|
3311 _max_worker_id, n_workers); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3312 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3313 if (G1CollectedHeap::use_parallel_gc_threads()) { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3314 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3315 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3316 _g1h->set_par_threads(n_workers); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3317 _g1h->workers()->run_task(&g1_par_agg_task); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3318 _g1h->set_par_threads(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3319 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3320 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3321 "sanity check"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3322 _g1h->reset_heap_region_claim_values(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3323 } else { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3324 g1_par_agg_task.work(0); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3325 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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 // 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
|
3329 void ConcurrentMark::clear_all_count_data() { |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3330 // 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
|
3331 // liveness count aggregation (during remark) and the |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3332 // final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3333 _card_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3334 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3335 // Clear the global region bitmap - it will be filled as part |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3336 // of the final counting task. |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3337 _region_bm.clear(); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3338 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3339 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
|
3340 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
|
3341 |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3342 for (uint i = 0; i < _max_worker_id; i += 1) { |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3343 BitMap* task_card_bm = count_card_bitmap_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3344 size_t* marked_bytes_array = count_marked_bytes_array_for(i); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3345 |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3346 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3347 assert(marked_bytes_array != NULL, "uninitialized"); |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3348 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3349 memset(marked_bytes_array, 0, (size_t) max_regions * sizeof(size_t)); |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3350 task_card_bm->clear(); |
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
johnc
parents:
4830
diff
changeset
|
3352 } |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3353 |
342 | 3354 void ConcurrentMark::print_stats() { |
3355 if (verbose_stats()) { | |
3356 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3357 for (size_t i = 0; i < _active_tasks; ++i) { | |
3358 _tasks[i]->print_stats(); | |
3359 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
3360 } | |
3361 } | |
3362 } | |
3363 | |
3364 // abandon current marking iteration due to a Full GC | |
3365 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
|
3366 // 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
|
3367 // concurrent bitmap clearing. |
342 | 3368 _nextMarkBitMap->clearAll(); |
20291
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
3369 |
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
3370 // Note we cannot clear the previous marking bitmap here |
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
3371 // since VerifyDuringGC verifies the objects marked during |
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
3372 // a full GC against the previous bitmap. |
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
3373 |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3374 // Clear the liveness counting data |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3375 clear_all_count_data(); |
342 | 3376 // Empty mark stack |
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
7397
diff
changeset
|
3377 reset_marking_state(); |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3378 for (uint i = 0; i < _max_worker_id; ++i) { |
342 | 3379 _tasks[i]->clear_region_fields(); |
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3380 } |
17949
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
pliden
parents:
17937
diff
changeset
|
3381 _first_overflow_barrier_sync.abort(); |
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
pliden
parents:
17937
diff
changeset
|
3382 _second_overflow_barrier_sync.abort(); |
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3383 const GCId& gc_id = _g1h->gc_tracer_cm()->gc_id(); |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3384 if (!gc_id.is_undefined()) { |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3385 // We can do multiple full GCs before ConcurrentMarkThread::run() gets a chance |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3386 // to detect that it was aborted. Only keep track of the first GC id that we aborted. |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3387 _aborted_gc_id = gc_id; |
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3388 } |
342 | 3389 _has_aborted = true; |
3390 | |
3391 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3392 satb_mq_set.abandon_partial_marking(); | |
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3393 // This can be called either during or outside marking, we'll read |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3394 // the expected_active value from the SATB queue set. |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3395 satb_mq_set.set_active_all_threads( |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3396 false, /* new active value */ |
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3397 satb_mq_set.is_active() /* expected_active */); |
10405 | 3398 |
3399 _g1h->trace_heap_after_concurrent_cycle(); | |
3400 _g1h->register_concurrent_cycle_end(); | |
342 | 3401 } |
3402 | |
20190
0982ec23da03
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3403 const GCId& ConcurrentMark::concurrent_gc_id() { |
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3404 if (has_aborted()) { |
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3405 return _aborted_gc_id; |
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3406 } |
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3407 return _g1h->gc_tracer_cm()->gc_id(); |
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3408 } |
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3409 |
342 | 3410 static void print_ms_time_info(const char* prefix, const char* name, |
3411 NumberSeq& ns) { | |
3412 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
3413 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
3414 if (ns.num() > 0) { | |
3415 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
3416 prefix, ns.sd(), ns.maximum()); | |
3417 } | |
3418 } | |
3419 | |
3420 void ConcurrentMark::print_summary_info() { | |
3421 gclog_or_tty->print_cr(" Concurrent marking:"); | |
3422 print_ms_time_info(" ", "init marks", _init_times); | |
3423 print_ms_time_info(" ", "remarks", _remark_times); | |
3424 { | |
3425 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
3426 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
3427 | |
3428 } | |
3429 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
3430 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
3431 _total_counting_time, | |
3432 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
3433 (double)_cleanup_times.num() | |
3434 : 0.0)); | |
3435 if (G1ScrubRemSets) { | |
3436 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
3437 _total_rs_scrub_time, | |
3438 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
3439 (double)_cleanup_times.num() | |
3440 : 0.0)); | |
3441 } | |
3442 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
3443 (_init_times.sum() + _remark_times.sum() + | |
3444 _cleanup_times.sum())/1000.0); | |
3445 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
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3446 "(%8.2f s marking).", |
342 | 3447 cmThread()->vtime_accum(), |
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3448 cmThread()->vtime_mark_accum()); |
342 | 3449 } |
3450 | |
1019 | 3451 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
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3452 if (use_parallel_marking_threads()) { |
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3453 _parallel_workers->print_worker_threads_on(st); |
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3454 } |
1019 | 3455 } |
3456 | |
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3457 void ConcurrentMark::print_on_error(outputStream* st) const { |
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3458 st->print_cr("Marking Bits (Prev, Next): (CMBitMap*) " PTR_FORMAT ", (CMBitMap*) " PTR_FORMAT, |
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3459 p2i(_prevMarkBitMap), p2i(_nextMarkBitMap)); |
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3460 _prevMarkBitMap->print_on_error(st, " Prev Bits: "); |
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3461 _nextMarkBitMap->print_on_error(st, " Next Bits: "); |
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3462 } |
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3463 |
342 | 3464 // We take a break if someone is trying to stop the world. |
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3465 bool ConcurrentMark::do_yield_check(uint worker_id) { |
20192 | 3466 if (SuspendibleThreadSet::should_yield()) { |
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3467 if (worker_id == 0) { |
342 | 3468 _g1h->g1_policy()->record_concurrent_pause(); |
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3469 } |
20192 | 3470 SuspendibleThreadSet::yield(); |
342 | 3471 return true; |
3472 } else { | |
3473 return false; | |
3474 } | |
3475 } | |
3476 | |
3477 #ifndef PRODUCT | |
3478 // for debugging purposes | |
3479 void ConcurrentMark::print_finger() { | |
3480 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
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3481 p2i(_heap_start), p2i(_heap_end), p2i(_finger)); |
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3482 for (uint i = 0; i < _max_worker_id; ++i) { |
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3483 gclog_or_tty->print(" %u: " PTR_FORMAT, i, p2i(_tasks[i]->finger())); |
342 | 3484 } |
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3485 gclog_or_tty->cr(); |
342 | 3486 } |
3487 #endif | |
3488 | |
3771 | 3489 void CMTask::scan_object(oop obj) { |
3490 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
3491 | |
3492 if (_cm->verbose_high()) { | |
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3493 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
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3494 _worker_id, p2i((void*) obj)); |
3771 | 3495 } |
3496 | |
3497 size_t obj_size = obj->size(); | |
3498 _words_scanned += obj_size; | |
3499 | |
3500 obj->oop_iterate(_cm_oop_closure); | |
3501 statsOnly( ++_objs_scanned ); | |
3502 check_limits(); | |
3503 } | |
3504 | |
342 | 3505 // Closure for iteration over bitmaps |
3506 class CMBitMapClosure : public BitMapClosure { | |
3507 private: | |
3508 // the bitmap that is being iterated over | |
3509 CMBitMap* _nextMarkBitMap; | |
3510 ConcurrentMark* _cm; | |
3511 CMTask* _task; | |
3512 | |
3513 public: | |
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3514 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
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3515 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
342 | 3516 |
3517 bool do_bit(size_t offset) { | |
3518 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
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3519 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
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3520 assert( addr < _cm->finger(), "invariant"); |
342 | 3521 |
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3522 statsOnly( _task->increase_objs_found_on_bitmap() ); |
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3523 assert(addr >= _task->finger(), "invariant"); |
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3524 |
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3525 // We move that task's local finger along. |
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|
3526 _task->move_finger_to(addr); |
342 | 3527 |
3528 _task->scan_object(oop(addr)); | |
3529 // we only partially drain the local queue and global stack | |
3530 _task->drain_local_queue(true); | |
3531 _task->drain_global_stack(true); | |
3532 | |
3533 // if the has_aborted flag has been raised, we need to bail out of | |
3534 // the iteration | |
3535 return !_task->has_aborted(); | |
3536 } | |
3537 }; | |
3538 | |
3771 | 3539 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
3540 ConcurrentMark* cm, | |
3541 CMTask* task) | |
3542 : _g1h(g1h), _cm(cm), _task(task) { | |
3543 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
3544 | |
3545 if (G1UseConcMarkReferenceProcessing) { | |
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|
3546 _ref_processor = g1h->ref_processor_cm(); |
3771 | 3547 assert(_ref_processor != NULL, "should not be NULL"); |
342 | 3548 } |
3771 | 3549 } |
342 | 3550 |
3551 void CMTask::setup_for_region(HeapRegion* hr) { | |
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|
3552 assert(hr != NULL, |
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|
3553 "claim_region() should have filtered out NULL regions"); |
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|
3554 assert(!hr->continuesHumongous(), |
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|
3555 "claim_region() should have filtered out continues humongous regions"); |
342 | 3556 |
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3557 if (_cm->verbose_low()) { |
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3558 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
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3559 _worker_id, p2i(hr)); |
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|
3560 } |
342 | 3561 |
3562 _curr_region = hr; | |
3563 _finger = hr->bottom(); | |
3564 update_region_limit(); | |
3565 } | |
3566 | |
3567 void CMTask::update_region_limit() { | |
3568 HeapRegion* hr = _curr_region; | |
3569 HeapWord* bottom = hr->bottom(); | |
3570 HeapWord* limit = hr->next_top_at_mark_start(); | |
3571 | |
3572 if (limit == bottom) { | |
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|
3573 if (_cm->verbose_low()) { |
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3574 gclog_or_tty->print_cr("[%u] found an empty region " |
342 | 3575 "["PTR_FORMAT", "PTR_FORMAT")", |
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3576 _worker_id, p2i(bottom), p2i(limit)); |
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|
3577 } |
342 | 3578 // The region was collected underneath our feet. |
3579 // We set the finger to bottom to ensure that the bitmap | |
3580 // iteration that will follow this will not do anything. | |
3581 // (this is not a condition that holds when we set the region up, | |
3582 // as the region is not supposed to be empty in the first place) | |
3583 _finger = bottom; | |
3584 } else if (limit >= _region_limit) { | |
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|
3585 assert(limit >= _finger, "peace of mind"); |
342 | 3586 } else { |
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|
3587 assert(limit < _region_limit, "only way to get here"); |
342 | 3588 // This can happen under some pretty unusual circumstances. An |
3589 // evacuation pause empties the region underneath our feet (NTAMS | |
3590 // at bottom). We then do some allocation in the region (NTAMS | |
3591 // stays at bottom), followed by the region being used as a GC | |
3592 // alloc region (NTAMS will move to top() and the objects | |
3593 // originally below it will be grayed). All objects now marked in | |
3594 // the region are explicitly grayed, if below the global finger, | |
3595 // and we do not need in fact to scan anything else. So, we simply | |
3596 // set _finger to be limit to ensure that the bitmap iteration | |
3597 // doesn't do anything. | |
3598 _finger = limit; | |
3599 } | |
3600 | |
3601 _region_limit = limit; | |
3602 } | |
3603 | |
3604 void CMTask::giveup_current_region() { | |
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|
3605 assert(_curr_region != NULL, "invariant"); |
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|
3606 if (_cm->verbose_low()) { |
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3607 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
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3608 _worker_id, p2i(_curr_region)); |
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3609 } |
342 | 3610 clear_region_fields(); |
3611 } | |
3612 | |
3613 void CMTask::clear_region_fields() { | |
3614 // Values for these three fields that indicate that we're not | |
3615 // holding on to a region. | |
3616 _curr_region = NULL; | |
3617 _finger = NULL; | |
3618 _region_limit = NULL; | |
3619 } | |
3620 | |
3771 | 3621 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
3622 if (cm_oop_closure == NULL) { | |
3623 assert(_cm_oop_closure != NULL, "invariant"); | |
3624 } else { | |
3625 assert(_cm_oop_closure == NULL, "invariant"); | |
3626 } | |
3627 _cm_oop_closure = cm_oop_closure; | |
3628 } | |
3629 | |
342 | 3630 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
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3631 guarantee(nextMarkBitMap != NULL, "invariant"); |
342 | 3632 |
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3633 if (_cm->verbose_low()) { |
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3634 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
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3635 } |
342 | 3636 |
3637 _nextMarkBitMap = nextMarkBitMap; | |
3638 clear_region_fields(); | |
3639 | |
3640 _calls = 0; | |
3641 _elapsed_time_ms = 0.0; | |
3642 _termination_time_ms = 0.0; | |
3643 _termination_start_time_ms = 0.0; | |
3644 | |
3645 #if _MARKING_STATS_ | |
3646 _local_pushes = 0; | |
3647 _local_pops = 0; | |
3648 _local_max_size = 0; | |
3649 _objs_scanned = 0; | |
3650 _global_pushes = 0; | |
3651 _global_pops = 0; | |
3652 _global_max_size = 0; | |
3653 _global_transfers_to = 0; | |
3654 _global_transfers_from = 0; | |
3655 _regions_claimed = 0; | |
3656 _objs_found_on_bitmap = 0; | |
3657 _satb_buffers_processed = 0; | |
3658 _steal_attempts = 0; | |
3659 _steals = 0; | |
3660 _aborted = 0; | |
3661 _aborted_overflow = 0; | |
3662 _aborted_cm_aborted = 0; | |
3663 _aborted_yield = 0; | |
3664 _aborted_timed_out = 0; | |
3665 _aborted_satb = 0; | |
3666 _aborted_termination = 0; | |
3667 #endif // _MARKING_STATS_ | |
3668 } | |
3669 | |
3670 bool CMTask::should_exit_termination() { | |
3671 regular_clock_call(); | |
3672 // This is called when we are in the termination protocol. We should | |
3673 // quit if, for some reason, this task wants to abort or the global | |
3674 // stack is not empty (this means that we can get work from it). | |
3675 return !_cm->mark_stack_empty() || has_aborted(); | |
3676 } | |
3677 | |
3678 void CMTask::reached_limit() { | |
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3679 assert(_words_scanned >= _words_scanned_limit || |
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3680 _refs_reached >= _refs_reached_limit , |
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3681 "shouldn't have been called otherwise"); |
342 | 3682 regular_clock_call(); |
3683 } | |
3684 | |
3685 void CMTask::regular_clock_call() { | |
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3686 if (has_aborted()) return; |
342 | 3687 |
3688 // First, we need to recalculate the words scanned and refs reached | |
3689 // limits for the next clock call. | |
3690 recalculate_limits(); | |
3691 | |
3692 // During the regular clock call we do the following | |
3693 | |
3694 // (1) If an overflow has been flagged, then we abort. | |
3695 if (_cm->has_overflown()) { | |
3696 set_has_aborted(); | |
3697 return; | |
3698 } | |
3699 | |
3700 // If we are not concurrent (i.e. we're doing remark) we don't need | |
3701 // to check anything else. The other steps are only needed during | |
3702 // the concurrent marking phase. | |
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3703 if (!concurrent()) return; |
342 | 3704 |
3705 // (2) If marking has been aborted for Full GC, then we also abort. | |
3706 if (_cm->has_aborted()) { | |
3707 set_has_aborted(); | |
3708 statsOnly( ++_aborted_cm_aborted ); | |
3709 return; | |
3710 } | |
3711 | |
3712 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
3713 | |
3714 // (3) If marking stats are enabled, then we update the step history. | |
3715 #if _MARKING_STATS_ | |
3776
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3716 if (_words_scanned >= _words_scanned_limit) { |
342 | 3717 ++_clock_due_to_scanning; |
3776
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|
3718 } |
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3719 if (_refs_reached >= _refs_reached_limit) { |
342 | 3720 ++_clock_due_to_marking; |
3776
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3721 } |
342 | 3722 |
3723 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
3724 _interval_start_time_ms = curr_time_ms; | |
3725 _all_clock_intervals_ms.add(last_interval_ms); | |
3726 | |
3727 if (_cm->verbose_medium()) { | |
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|
3728 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
20380
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3729 "scanned = "SIZE_FORMAT"%s, refs reached = "SIZE_FORMAT"%s", |
6862
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3730 _worker_id, last_interval_ms, |
3776
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3731 _words_scanned, |
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3732 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
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3733 _refs_reached, |
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|
3734 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
342 | 3735 } |
3736 #endif // _MARKING_STATS_ | |
3737 | |
3738 // (4) We check whether we should yield. If we have to, then we abort. | |
20192 | 3739 if (SuspendibleThreadSet::should_yield()) { |
342 | 3740 // We should yield. To do this we abort the task. The caller is |
3741 // responsible for yielding. | |
3742 set_has_aborted(); | |
3743 statsOnly( ++_aborted_yield ); | |
3744 return; | |
3745 } | |
3746 | |
3747 // (5) We check whether we've reached our time quota. If we have, | |
3748 // then we abort. | |
3749 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
3750 if (elapsed_time_ms > _time_target_ms) { | |
3751 set_has_aborted(); | |
2174
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|
3752 _has_timed_out = true; |
342 | 3753 statsOnly( ++_aborted_timed_out ); |
3754 return; | |
3755 } | |
3756 | |
3757 // (6) Finally, we check whether there are enough completed STAB | |
3758 // buffers available for processing. If there are, we abort. | |
3759 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3760 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
3776
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3761 if (_cm->verbose_low()) { |
6862
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3762 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
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3763 _worker_id); |
3776
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|
3764 } |
342 | 3765 // we do need to process SATB buffers, we'll abort and restart |
3766 // the marking task to do so | |
3767 set_has_aborted(); | |
3768 statsOnly( ++_aborted_satb ); | |
3769 return; | |
3770 } | |
3771 } | |
3772 | |
3773 void CMTask::recalculate_limits() { | |
3774 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
3775 _words_scanned_limit = _real_words_scanned_limit; | |
3776 | |
3777 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
3778 _refs_reached_limit = _real_refs_reached_limit; | |
3779 } | |
3780 | |
3781 void CMTask::decrease_limits() { | |
3782 // This is called when we believe that we're going to do an infrequent | |
3783 // operation which will increase the per byte scanned cost (i.e. move | |
3784 // entries to/from the global stack). It basically tries to decrease the | |
3785 // scanning limit so that the clock is called earlier. | |
3786 | |
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|
3787 if (_cm->verbose_medium()) { |
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3788 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
3776
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3789 } |
342 | 3790 |
3791 _words_scanned_limit = _real_words_scanned_limit - | |
3792 3 * words_scanned_period / 4; | |
3793 _refs_reached_limit = _real_refs_reached_limit - | |
3794 3 * refs_reached_period / 4; | |
3795 } | |
3796 | |
3797 void CMTask::move_entries_to_global_stack() { | |
3798 // local array where we'll store the entries that will be popped | |
3799 // from the local queue | |
3800 oop buffer[global_stack_transfer_size]; | |
3801 | |
3802 int n = 0; | |
3803 oop obj; | |
3804 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
3805 buffer[n] = obj; | |
3806 ++n; | |
3807 } | |
3808 | |
3809 if (n > 0) { | |
3810 // we popped at least one entry from the local queue | |
3811 | |
3812 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
3813 | |
3814 if (!_cm->mark_stack_push(buffer, n)) { | |
3776
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|
3815 if (_cm->verbose_low()) { |
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3816 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
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3817 _worker_id); |
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|
3818 } |
342 | 3819 set_has_aborted(); |
3820 } else { | |
3821 // the transfer was successful | |
3822 | |
3776
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|
3823 if (_cm->verbose_medium()) { |
6862
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3824 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
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|
3825 _worker_id, n); |
3776
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|
3826 } |
342 | 3827 statsOnly( int tmp_size = _cm->mark_stack_size(); |
3776
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3828 if (tmp_size > _global_max_size) { |
342 | 3829 _global_max_size = tmp_size; |
3776
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3830 } |
342 | 3831 _global_pushes += n ); |
3832 } | |
3833 } | |
3834 | |
3835 // this operation was quite expensive, so decrease the limits | |
3836 decrease_limits(); | |
3837 } | |
3838 | |
3839 void CMTask::get_entries_from_global_stack() { | |
3840 // local array where we'll store the entries that will be popped | |
3841 // from the global stack. | |
3842 oop buffer[global_stack_transfer_size]; | |
3843 int n; | |
3844 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
1023
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3845 assert(n <= global_stack_transfer_size, |
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|
3846 "we should not pop more than the given limit"); |
342 | 3847 if (n > 0) { |
3848 // yes, we did actually pop at least one entry | |
3849 | |
3850 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
3776
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|
3851 if (_cm->verbose_medium()) { |
6862
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|
3852 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
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7127708: G1: change task num types from int to uint in concurrent mark
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|
3853 _worker_id, n); |
3776
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|
3854 } |
342 | 3855 for (int i = 0; i < n; ++i) { |
3856 bool success = _task_queue->push(buffer[i]); | |
3857 // We only call this when the local queue is empty or under a | |
3858 // given target limit. So, we do not expect this push to fail. | |
1023
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3859 assert(success, "invariant"); |
342 | 3860 } |
3861 | |
3862 statsOnly( int tmp_size = _task_queue->size(); | |
3776
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|
3863 if (tmp_size > _local_max_size) { |
342 | 3864 _local_max_size = tmp_size; |
3776
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|
3865 } |
342 | 3866 _local_pushes += n ); |
3867 } | |
3868 | |
3869 // this operation was quite expensive, so decrease the limits | |
3870 decrease_limits(); | |
3871 } | |
3872 | |
3873 void CMTask::drain_local_queue(bool partially) { | |
3776
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|
3874 if (has_aborted()) return; |
342 | 3875 |
3876 // Decide what the target size is, depending whether we're going to | |
3877 // drain it partially (so that other tasks can steal if they run out | |
3878 // of things to do) or totally (at the very end). | |
3879 size_t target_size; | |
3776
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|
3880 if (partially) { |
342 | 3881 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
3776
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|
3882 } else { |
342 | 3883 target_size = 0; |
3776
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|
3884 } |
342 | 3885 |
3886 if (_task_queue->size() > target_size) { | |
3776
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|
3887 if (_cm->verbose_high()) { |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
3888 gclog_or_tty->print_cr("[%u] draining local queue, target size = " SIZE_FORMAT, |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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|
3889 _worker_id, target_size); |
3776
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|
3890 } |
342 | 3891 |
3892 oop obj; | |
3893 bool ret = _task_queue->pop_local(obj); | |
3894 while (ret) { | |
3895 statsOnly( ++_local_pops ); | |
3896 | |
3776
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|
3897 if (_cm->verbose_high()) { |
6862
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7127708: G1: change task num types from int to uint in concurrent mark
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diff
changeset
|
3898 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
17937
78bbf4d43a14
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|
3899 p2i((void*) obj)); |
3776
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|
3900 } |
342 | 3901 |
1023
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6888619: G1: too many guarantees in concurrent marking
tonyp
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diff
changeset
|
3902 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
2361 | 3903 assert(!_g1h->is_on_master_free_list( |
2152 | 3904 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
342 | 3905 |
3906 scan_object(obj); | |
3907 | |
3776
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|
3908 if (_task_queue->size() <= target_size || has_aborted()) { |
342 | 3909 ret = false; |
3776
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|
3910 } else { |
342 | 3911 ret = _task_queue->pop_local(obj); |
3776
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3912 } |
342 | 3913 } |
3914 | |
3776
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changeset
|
3915 if (_cm->verbose_high()) { |
6862
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|
3916 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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3917 _worker_id, _task_queue->size()); |
3776
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|
3918 } |
342 | 3919 } |
3920 } | |
3921 | |
3922 void CMTask::drain_global_stack(bool partially) { | |
3776
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|
3923 if (has_aborted()) return; |
342 | 3924 |
3925 // We have a policy to drain the local queue before we attempt to | |
3926 // drain the global stack. | |
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|
3927 assert(partially || _task_queue->size() == 0, "invariant"); |
342 | 3928 |
3929 // Decide what the target size is, depending whether we're going to | |
3930 // drain it partially (so that other tasks can steal if they run out | |
3931 // of things to do) or totally (at the very end). Notice that, | |
3932 // because we move entries from the global stack in chunks or | |
3933 // because another task might be doing the same, we might in fact | |
3934 // drop below the target. But, this is not a problem. | |
3935 size_t target_size; | |
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|
3936 if (partially) { |
342 | 3937 target_size = _cm->partial_mark_stack_size_target(); |
3776
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|
3938 } else { |
342 | 3939 target_size = 0; |
3776
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|
3940 } |
342 | 3941 |
3942 if (_cm->mark_stack_size() > target_size) { | |
3776
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|
3943 if (_cm->verbose_low()) { |
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|
3944 gclog_or_tty->print_cr("[%u] draining global_stack, target size " SIZE_FORMAT, |
6862
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|
3945 _worker_id, target_size); |
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|
3946 } |
342 | 3947 |
3948 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
3949 get_entries_from_global_stack(); | |
3950 drain_local_queue(partially); | |
3951 } | |
3952 | |
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changeset
|
3953 if (_cm->verbose_low()) { |
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|
3954 gclog_or_tty->print_cr("[%u] drained global stack, size = " SIZE_FORMAT, |
6862
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|
3955 _worker_id, _cm->mark_stack_size()); |
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|
3956 } |
342 | 3957 } |
3958 } | |
3959 | |
3960 // SATB Queue has several assumptions on whether to call the par or | |
3961 // non-par versions of the methods. this is why some of the code is | |
3962 // replicated. We should really get rid of the single-threaded version | |
3963 // of the code to simplify things. | |
3964 void CMTask::drain_satb_buffers() { | |
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|
3965 if (has_aborted()) return; |
342 | 3966 |
3967 // We set this so that the regular clock knows that we're in the | |
3968 // middle of draining buffers and doesn't set the abort flag when it | |
3969 // notices that SATB buffers are available for draining. It'd be | |
3970 // very counter productive if it did that. :-) | |
3971 _draining_satb_buffers = true; | |
3972 | |
3973 CMObjectClosure oc(this); | |
3974 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
3776
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|
3975 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6862
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|
3976 satb_mq_set.set_par_closure(_worker_id, &oc); |
3776
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|
3977 } else { |
342 | 3978 satb_mq_set.set_closure(&oc); |
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|
3979 } |
342 | 3980 |
3981 // This keeps claiming and applying the closure to completed buffers | |
3982 // until we run out of buffers or we need to abort. | |
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3983 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3984 while (!has_aborted() && |
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3985 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
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3986 if (_cm->verbose_medium()) { |
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3987 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3988 } |
342 | 3989 statsOnly( ++_satb_buffers_processed ); |
3990 regular_clock_call(); | |
3991 } | |
3992 } else { | |
3993 while (!has_aborted() && | |
3994 satb_mq_set.apply_closure_to_completed_buffer()) { | |
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3995 if (_cm->verbose_medium()) { |
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3996 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
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3997 } |
342 | 3998 statsOnly( ++_satb_buffers_processed ); |
3999 regular_clock_call(); | |
4000 } | |
4001 } | |
4002 | |
4003 _draining_satb_buffers = false; | |
4004 | |
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4005 assert(has_aborted() || |
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4006 concurrent() || |
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4007 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
342 | 4008 |
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4009 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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4010 satb_mq_set.set_par_closure(_worker_id, NULL); |
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4011 } else { |
342 | 4012 satb_mq_set.set_closure(NULL); |
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4013 } |
342 | 4014 |
4015 // again, this was a potentially expensive operation, decrease the | |
4016 // limits to get the regular clock call early | |
4017 decrease_limits(); | |
4018 } | |
4019 | |
4020 void CMTask::print_stats() { | |
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4021 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
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4022 _worker_id, _calls); |
342 | 4023 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
4024 _elapsed_time_ms, _termination_time_ms); | |
4025 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4026 _step_times_ms.num(), _step_times_ms.avg(), | |
4027 _step_times_ms.sd()); | |
4028 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4029 _step_times_ms.maximum(), _step_times_ms.sum()); | |
4030 | |
4031 #if _MARKING_STATS_ | |
4032 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
4033 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
4034 _all_clock_intervals_ms.sd()); | |
4035 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
4036 _all_clock_intervals_ms.maximum(), | |
4037 _all_clock_intervals_ms.sum()); | |
4038 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
4039 _clock_due_to_scanning, _clock_due_to_marking); | |
4040 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
4041 _objs_scanned, _objs_found_on_bitmap); | |
4042 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
4043 _local_pushes, _local_pops, _local_max_size); | |
4044 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
4045 _global_pushes, _global_pops, _global_max_size); | |
4046 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
4047 _global_transfers_to,_global_transfers_from); | |
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4048 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
342 | 4049 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
4050 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
4051 _steal_attempts, _steals); | |
4052 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
4053 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
4054 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
4055 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
4056 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
4057 #endif // _MARKING_STATS_ | |
4058 } | |
4059 | |
4060 /***************************************************************************** | |
4061 | |
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4062 The do_marking_step(time_target_ms, ...) method is the building |
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4063 block of the parallel marking framework. It can be called in parallel |
342 | 4064 with other invocations of do_marking_step() on different tasks |
4065 (but only one per task, obviously) and concurrently with the | |
4066 mutator threads, or during remark, hence it eliminates the need | |
4067 for two versions of the code. When called during remark, it will | |
4068 pick up from where the task left off during the concurrent marking | |
4069 phase. Interestingly, tasks are also claimable during evacuation | |
4070 pauses too, since do_marking_step() ensures that it aborts before | |
4071 it needs to yield. | |
4072 | |
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4073 The data structures that it uses to do marking work are the |
342 | 4074 following: |
4075 | |
4076 (1) Marking Bitmap. If there are gray objects that appear only | |
4077 on the bitmap (this happens either when dealing with an overflow | |
4078 or when the initial marking phase has simply marked the roots | |
4079 and didn't push them on the stack), then tasks claim heap | |
4080 regions whose bitmap they then scan to find gray objects. A | |
4081 global finger indicates where the end of the last claimed region | |
4082 is. A local finger indicates how far into the region a task has | |
4083 scanned. The two fingers are used to determine how to gray an | |
4084 object (i.e. whether simply marking it is OK, as it will be | |
4085 visited by a task in the future, or whether it needs to be also | |
4086 pushed on a stack). | |
4087 | |
4088 (2) Local Queue. The local queue of the task which is accessed | |
4089 reasonably efficiently by the task. Other tasks can steal from | |
4090 it when they run out of work. Throughout the marking phase, a | |
4091 task attempts to keep its local queue short but not totally | |
4092 empty, so that entries are available for stealing by other | |
4093 tasks. Only when there is no more work, a task will totally | |
4094 drain its local queue. | |
4095 | |
4096 (3) Global Mark Stack. This handles local queue overflow. During | |
4097 marking only sets of entries are moved between it and the local | |
4098 queues, as access to it requires a mutex and more fine-grain | |
4099 interaction with it which might cause contention. If it | |
4100 overflows, then the marking phase should restart and iterate | |
4101 over the bitmap to identify gray objects. Throughout the marking | |
4102 phase, tasks attempt to keep the global mark stack at a small | |
4103 length but not totally empty, so that entries are available for | |
4104 popping by other tasks. Only when there is no more work, tasks | |
4105 will totally drain the global mark stack. | |
4106 | |
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4107 (4) SATB Buffer Queue. This is where completed SATB buffers are |
342 | 4108 made available. Buffers are regularly removed from this queue |
4109 and scanned for roots, so that the queue doesn't get too | |
4110 long. During remark, all completed buffers are processed, as | |
4111 well as the filled in parts of any uncompleted buffers. | |
4112 | |
4113 The do_marking_step() method tries to abort when the time target | |
4114 has been reached. There are a few other cases when the | |
4115 do_marking_step() method also aborts: | |
4116 | |
4117 (1) When the marking phase has been aborted (after a Full GC). | |
4118 | |
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4119 (2) When a global overflow (on the global stack) has been |
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4120 triggered. Before the task aborts, it will actually sync up with |
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4121 the other tasks to ensure that all the marking data structures |
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4122 (local queues, stacks, fingers etc.) are re-initialized so that |
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4123 when do_marking_step() completes, the marking phase can |
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4124 immediately restart. |
342 | 4125 |
4126 (3) When enough completed SATB buffers are available. The | |
4127 do_marking_step() method only tries to drain SATB buffers right | |
4128 at the beginning. So, if enough buffers are available, the | |
4129 marking step aborts and the SATB buffers are processed at | |
4130 the beginning of the next invocation. | |
4131 | |
4132 (4) To yield. when we have to yield then we abort and yield | |
4133 right at the end of do_marking_step(). This saves us from a lot | |
4134 of hassle as, by yielding we might allow a Full GC. If this | |
4135 happens then objects will be compacted underneath our feet, the | |
4136 heap might shrink, etc. We save checking for this by just | |
4137 aborting and doing the yield right at the end. | |
4138 | |
4139 From the above it follows that the do_marking_step() method should | |
4140 be called in a loop (or, otherwise, regularly) until it completes. | |
4141 | |
4142 If a marking step completes without its has_aborted() flag being | |
4143 true, it means it has completed the current marking phase (and | |
4144 also all other marking tasks have done so and have all synced up). | |
4145 | |
4146 A method called regular_clock_call() is invoked "regularly" (in | |
4147 sub ms intervals) throughout marking. It is this clock method that | |
4148 checks all the abort conditions which were mentioned above and | |
4149 decides when the task should abort. A work-based scheme is used to | |
4150 trigger this clock method: when the number of object words the | |
4151 marking phase has scanned or the number of references the marking | |
4152 phase has visited reach a given limit. Additional invocations to | |
4153 the method clock have been planted in a few other strategic places | |
4154 too. The initial reason for the clock method was to avoid calling | |
4155 vtime too regularly, as it is quite expensive. So, once it was in | |
4156 place, it was natural to piggy-back all the other conditions on it | |
4157 too and not constantly check them throughout the code. | |
4158 | |
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4159 If do_termination is true then do_marking_step will enter its |
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4160 termination protocol. |
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4161 |
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4162 The value of is_serial must be true when do_marking_step is being |
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4163 called serially (i.e. by the VMThread) and do_marking_step should |
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4164 skip any synchronization in the termination and overflow code. |
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4165 Examples include the serial remark code and the serial reference |
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4166 processing closures. |
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4167 |
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4168 The value of is_serial must be false when do_marking_step is |
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4169 being called by any of the worker threads in a work gang. |
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4170 Examples include the concurrent marking code (CMMarkingTask), |
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4171 the MT remark code, and the MT reference processing closures. |
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4172 |
342 | 4173 *****************************************************************************/ |
4174 | |
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4175 void CMTask::do_marking_step(double time_target_ms, |
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4176 bool do_termination, |
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4177 bool is_serial) { |
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4178 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
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4179 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
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4180 |
342 | 4181 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
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4182 assert(_task_queues != NULL, "invariant"); |
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4183 assert(_task_queue != NULL, "invariant"); |
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4184 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
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4185 |
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4186 assert(!_claimed, |
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4187 "only one thread should claim this task at any one time"); |
342 | 4188 |
4189 // OK, this doesn't safeguard again all possible scenarios, as it is | |
4190 // possible for two threads to set the _claimed flag at the same | |
4191 // time. But it is only for debugging purposes anyway and it will | |
4192 // catch most problems. | |
4193 _claimed = true; | |
4194 | |
4195 _start_time_ms = os::elapsedVTime() * 1000.0; | |
4196 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
4197 | |
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4198 // If do_stealing is true then do_marking_step will attempt to |
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4199 // steal work from the other CMTasks. It only makes sense to |
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4200 // enable stealing when the termination protocol is enabled |
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4201 // and do_marking_step() is not being called serially. |
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4202 bool do_stealing = do_termination && !is_serial; |
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4203 |
342 | 4204 double diff_prediction_ms = |
4205 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
4206 _time_target_ms = time_target_ms - diff_prediction_ms; | |
4207 | |
4208 // set up the variables that are used in the work-based scheme to | |
4209 // call the regular clock method | |
4210 _words_scanned = 0; | |
4211 _refs_reached = 0; | |
4212 recalculate_limits(); | |
4213 | |
4214 // clear all flags | |
4215 clear_has_aborted(); | |
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4216 _has_timed_out = false; |
342 | 4217 _draining_satb_buffers = false; |
4218 | |
4219 ++_calls; | |
4220 | |
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4221 if (_cm->verbose_low()) { |
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4222 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
342 | 4223 "target = %1.2lfms >>>>>>>>>>", |
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4224 _worker_id, _calls, _time_target_ms); |
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4225 } |
342 | 4226 |
4227 // Set up the bitmap and oop closures. Anything that uses them is | |
4228 // eventually called from this method, so it is OK to allocate these | |
4229 // statically. | |
4230 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
3771 | 4231 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
4232 set_cm_oop_closure(&cm_oop_closure); | |
342 | 4233 |
4234 if (_cm->has_overflown()) { | |
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4235 // This can happen if the mark stack overflows during a GC pause |
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4236 // and this task, after a yield point, restarts. We have to abort |
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4237 // as we need to get into the overflow protocol which happens |
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4238 // right at the end of this task. |
342 | 4239 set_has_aborted(); |
4240 } | |
4241 | |
4242 // First drain any available SATB buffers. After this, we will not | |
4243 // look at SATB buffers before the next invocation of this method. | |
4244 // If enough completed SATB buffers are queued up, the regular clock | |
4245 // will abort this task so that it restarts. | |
4246 drain_satb_buffers(); | |
4247 // ...then partially drain the local queue and the global stack | |
4248 drain_local_queue(true); | |
4249 drain_global_stack(true); | |
4250 | |
4251 do { | |
4252 if (!has_aborted() && _curr_region != NULL) { | |
4253 // This means that we're already holding on to a region. | |
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diff
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|
4254 assert(_finger != NULL, "if region is not NULL, then the finger " |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
4255 "should not be NULL either"); |
342 | 4256 |
4257 // We might have restarted this task after an evacuation pause | |
4258 // which might have evacuated the region we're holding on to | |
4259 // underneath our feet. Let's read its limit again to make sure | |
4260 // that we do not iterate over a region of the heap that | |
4261 // contains garbage (update_region_limit() will also move | |
4262 // _finger to the start of the region if it is found empty). | |
4263 update_region_limit(); | |
4264 // We will start from _finger not from the start of the region, | |
4265 // as we might be restarting this task after aborting half-way | |
4266 // through scanning this region. In this case, _finger points to | |
4267 // the address where we last found a marked object. If this is a | |
4268 // fresh region, _finger points to start(). | |
4269 MemRegion mr = MemRegion(_finger, _region_limit); | |
4270 | |
3776
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|
4271 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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|
4272 gclog_or_tty->print_cr("[%u] we're scanning part " |
342 | 4273 "["PTR_FORMAT", "PTR_FORMAT") " |
8039
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4274 "of region "HR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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17844
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|
4275 _worker_id, p2i(_finger), p2i(_region_limit), |
8039
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4276 HR_FORMAT_PARAMS(_curr_region)); |
3776
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|
4277 } |
342 | 4278 |
8039
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4279 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4280 "humongous regions should go around loop once only"); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4281 |
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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|
4282 // Some special cases: |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4283 // If the memory region is empty, we can just give up the region. |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4284 // If the current region is humongous then we only need to check |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
parents:
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diff
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|
4285 // the bitmap for the bit associated with the start of the object, |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
parents:
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|
4286 // scan the object if it's live, and give up the region. |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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changeset
|
4287 // Otherwise, let's iterate over the bitmap of the part of the region |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4288 // that is left. |
8034
bce1ac447f6b
7052429: G1: Avoid unnecessary scanning of humongous regions during concurrent marking
johnc
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8014
diff
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|
4289 // If the iteration is successful, give up the region. |
8039
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4290 if (mr.is_empty()) { |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4291 giveup_current_region(); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4292 regular_clock_call(); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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diff
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|
4293 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4294 if (_nextMarkBitMap->isMarked(mr.start())) { |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
parents:
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|
4295 // The object is marked - apply the closure |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4296 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(mr.start()); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
parents:
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|
4297 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
johnc
parents:
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|
4298 } |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
parents:
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changeset
|
4299 // Even if this task aborted while scanning the humongous object |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
parents:
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|
4300 // we can (and should) give up the current region. |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
parents:
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changeset
|
4301 giveup_current_region(); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
parents:
8034
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changeset
|
4302 regular_clock_call(); |
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
parents:
8034
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|
4303 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
342 | 4304 giveup_current_region(); |
4305 regular_clock_call(); | |
4306 } else { | |
1023
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1022
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|
4307 assert(has_aborted(), "currently the only way to do so"); |
342 | 4308 // The only way to abort the bitmap iteration is to return |
4309 // false from the do_bit() method. However, inside the | |
4310 // do_bit() method we move the _finger to point to the | |
4311 // object currently being looked at. So, if we bail out, we | |
4312 // have definitely set _finger to something non-null. | |
1023
11d4857fe5e1
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tonyp
parents:
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diff
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|
4313 assert(_finger != NULL, "invariant"); |
342 | 4314 |
4315 // Region iteration was actually aborted. So now _finger | |
4316 // points to the address of the object we last scanned. If we | |
4317 // leave it there, when we restart this task, we will rescan | |
4318 // the object. It is easy to avoid this. We move the finger by | |
4319 // enough to point to the next possible object header (the | |
4320 // bitmap knows by how much we need to move it as it knows its | |
4321 // granularity). | |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4322 assert(_finger < _region_limit, "invariant"); |
8733
9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
tamao
parents:
8039
diff
changeset
|
4323 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4324 // Check if bitmap iteration was aborted while scanning the last object |
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4325 if (new_finger >= _region_limit) { |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
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|
4326 giveup_current_region(); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4327 } else { |
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
4837
diff
changeset
|
4328 move_finger_to(new_finger); |
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
apetrusenko
parents:
1284
diff
changeset
|
4329 } |
342 | 4330 } |
4331 } | |
4332 // At this point we have either completed iterating over the | |
4333 // region we were holding on to, or we have aborted. | |
4334 | |
4335 // We then partially drain the local queue and the global stack. | |
4336 // (Do we really need this?) | |
4337 drain_local_queue(true); | |
4338 drain_global_stack(true); | |
4339 | |
4340 // Read the note on the claim_region() method on why it might | |
4341 // return NULL with potentially more regions available for | |
4342 // claiming and why we have to check out_of_regions() to determine | |
4343 // whether we're done or not. | |
4344 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
4345 // We are going to try to claim a new region. We should have | |
4346 // given up on the previous one. | |
1023
11d4857fe5e1
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tonyp
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1022
diff
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|
4347 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4348 assert(_curr_region == NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4349 assert(_finger == NULL, "invariant"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4350 assert(_region_limit == NULL, "invariant"); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
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|
4351 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4352 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4353 } |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4354 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
342 | 4355 if (claimed_region != NULL) { |
4356 // Yes, we managed to claim one | |
4357 statsOnly( ++_regions_claimed ); | |
4358 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4359 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4360 gclog_or_tty->print_cr("[%u] we successfully claimed " |
342 | 4361 "region "PTR_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
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|
4362 _worker_id, p2i(claimed_region)); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4363 } |
342 | 4364 |
4365 setup_for_region(claimed_region); | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4366 assert(_curr_region == claimed_region, "invariant"); |
342 | 4367 } |
4368 // It is important to call the regular clock here. It might take | |
4369 // a while to claim a region if, for example, we hit a large | |
4370 // block of empty regions. So we need to call the regular clock | |
4371 // method once round the loop to make sure it's called | |
4372 // frequently enough. | |
4373 regular_clock_call(); | |
4374 } | |
4375 | |
4376 if (!has_aborted() && _curr_region == NULL) { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4377 assert(_cm->out_of_regions(), |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4378 "at this point we should be out of regions"); |
342 | 4379 } |
4380 } while ( _curr_region != NULL && !has_aborted()); | |
4381 | |
4382 if (!has_aborted()) { | |
4383 // 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
|
4384 // tasks might be pushing objects to it concurrently. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4385 assert(_cm->out_of_regions(), |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4386 "at this point we should be out of regions"); |
342 | 4387 |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
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|
4388 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4389 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
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|
4390 } |
342 | 4391 |
4392 // Try to reduce the number of available SATB buffers so that | |
4393 // remark has less work to do. | |
4394 drain_satb_buffers(); | |
4395 } | |
4396 | |
4397 // Since we've done everything else, we can now totally drain the | |
4398 // local queue and global stack. | |
4399 drain_local_queue(false); | |
4400 drain_global_stack(false); | |
4401 | |
4402 // Attempt at work stealing from other task's queues. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
4403 if (do_stealing && !has_aborted()) { |
342 | 4404 // We have not aborted. This means that we have finished all that |
4405 // we could. Let's try to do some stealing... | |
4406 | |
4407 // 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
|
4408 // tasks might be pushing objects to it concurrently. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
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|
4409 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4410 "only way to reach here"); |
342 | 4411 |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4412 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4413 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
3776
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7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4414 } |
342 | 4415 |
4416 while (!has_aborted()) { | |
4417 oop obj; | |
4418 statsOnly( ++_steal_attempts ); | |
4419 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4420 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4421 if (_cm->verbose_medium()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4422 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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17844
diff
changeset
|
4423 _worker_id, p2i((void*) obj)); |
3776
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3772
diff
changeset
|
4424 } |
342 | 4425 |
4426 statsOnly( ++_steals ); | |
4427 | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4428 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4429 "any stolen object should be marked"); |
342 | 4430 scan_object(obj); |
4431 | |
4432 // And since we're towards the end, let's totally drain the | |
4433 // local queue and global stack. | |
4434 drain_local_queue(false); | |
4435 drain_global_stack(false); | |
4436 } else { | |
4437 break; | |
4438 } | |
4439 } | |
4440 } | |
4441 | |
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4442 // 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
|
4443 // 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
|
4444 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
|
4445 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
|
4446 _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
|
4447 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
|
4448 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
changeset
|
4449 } |
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
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2436
diff
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|
4450 |
342 | 4451 // We still haven't aborted. Now, let's try to get into the |
4452 // termination protocol. | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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|
4453 if (do_termination && !has_aborted()) { |
342 | 4454 // 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
|
4455 // tasks might be concurrently pushing objects on it. |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4456 // Separated the asserts so that we know which one fires. |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
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diff
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|
4457 assert(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4458 assert(_task_queue->size() == 0, "only way to reach here"); |
342 | 4459 |
3776
23d434c6290d
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diff
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|
4460 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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|
4461 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
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|
4462 } |
342 | 4463 |
4464 _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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|
4465 |
342 | 4466 // The CMTask class also extends the TerminatorTerminator class, |
4467 // hence its should_exit_termination() method will also decide | |
4468 // whether to exit the termination protocol or not. | |
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4469 bool finished = (is_serial || |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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8744
diff
changeset
|
4470 _cm->terminator()->offer_termination(this)); |
342 | 4471 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
4472 _termination_time_ms += | |
4473 termination_end_time_ms - _termination_start_time_ms; | |
4474 | |
4475 if (finished) { | |
4476 // We're all done. | |
4477 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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|
4478 if (_worker_id == 0) { |
342 | 4479 // let's allow task 0 to do this |
4480 if (concurrent()) { | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4481 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
342 | 4482 // we need to set this to false before the next |
4483 // safepoint. This way we ensure that the marking phase | |
4484 // doesn't observe any more heap expansions. | |
4485 _cm->clear_concurrent_marking_in_progress(); | |
4486 } | |
4487 } | |
4488 | |
4489 // We can now guarantee that the global stack is empty, since | |
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4490 // all other tasks have finished. We separated the guarantees so |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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parents:
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diff
changeset
|
4491 // that, if a condition is false, we can immediately find out |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
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|
4492 // which one. |
11d4857fe5e1
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parents:
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diff
changeset
|
4493 guarantee(_cm->out_of_regions(), "only way to reach here"); |
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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|
4494 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
11d4857fe5e1
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|
4495 guarantee(_task_queue->size() == 0, "only way to reach here"); |
11d4857fe5e1
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diff
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|
4496 guarantee(!_cm->has_overflown(), "only way to reach here"); |
11d4857fe5e1
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|
4497 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
342 | 4498 |
3776
23d434c6290d
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|
4499 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
4500 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
3776
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|
4501 } |
342 | 4502 } else { |
4503 // Apparently there's more work to do. Let's abort this task. It | |
4504 // will restart it and we can hopefully find more things to do. | |
4505 | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
4506 if (_cm->verbose_low()) { |
6862
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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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|
4507 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
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diff
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|
4508 _worker_id); |
3776
23d434c6290d
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|
4509 } |
342 | 4510 |
4511 set_has_aborted(); | |
4512 statsOnly( ++_aborted_termination ); | |
4513 } | |
4514 } | |
4515 | |
4516 // Mainly for debugging purposes to make sure that a pointer to the | |
4517 // closure which was statically allocated in this frame doesn't | |
4518 // escape it by accident. | |
3771 | 4519 set_cm_oop_closure(NULL); |
342 | 4520 double end_time_ms = os::elapsedVTime() * 1000.0; |
4521 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
4522 // Update the step history. | |
4523 _step_times_ms.add(elapsed_time_ms); | |
4524 | |
4525 if (has_aborted()) { | |
4526 // The task was aborted for some reason. | |
4527 | |
4528 statsOnly( ++_aborted ); | |
4529 | |
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
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|
4530 if (_has_timed_out) { |
342 | 4531 double diff_ms = elapsed_time_ms - _time_target_ms; |
4532 // Keep statistics of how well we did with respect to hitting | |
4533 // our target only if we actually timed out (if we aborted for | |
4534 // other reasons, then the results might get skewed). | |
4535 _marking_step_diffs_ms.add(diff_ms); | |
4536 } | |
4537 | |
4538 if (_cm->has_overflown()) { | |
4539 // This is the interesting one. We aborted because a global | |
4540 // overflow was raised. This means we have to restart the | |
4541 // marking phase and start iterating over regions. However, in | |
4542 // order to do this we have to make sure that all tasks stop | |
4543 // what they are doing and re-initialise in a safe manner. We | |
4544 // will achieve this with the use of two barrier sync points. | |
4545 | |
3776
23d434c6290d
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3772
diff
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|
4546 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
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parents:
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diff
changeset
|
4547 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
3776
23d434c6290d
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|
4548 } |
342 | 4549 |
8787
fa08949fe0cb
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parents:
8744
diff
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|
4550 if (!is_serial) { |
fa08949fe0cb
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parents:
8744
diff
changeset
|
4551 // 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
|
4552 // from a parallel context |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4553 _cm->enter_first_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4554 |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4555 // When we exit this sync barrier we know that all tasks have |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4556 // stopped doing marking work. So, it's now safe to |
fa08949fe0cb
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parents:
8744
diff
changeset
|
4557 // re-initialise our data structures. At the end of this method, |
fa08949fe0cb
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johnc
parents:
8744
diff
changeset
|
4558 // task 0 will clear the global data structures. |
fa08949fe0cb
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parents:
8744
diff
changeset
|
4559 } |
342 | 4560 |
4561 statsOnly( ++_aborted_overflow ); | |
4562 | |
4563 // We clear the local state of this task... | |
4564 clear_region_fields(); | |
4565 | |
8787
fa08949fe0cb
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parents:
8744
diff
changeset
|
4566 if (!is_serial) { |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4567 // ...and enter the second barrier. |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4568 _cm->enter_second_sync_barrier(_worker_id); |
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4569 } |
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4570 // 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
|
4571 // marking, everything has been re-initialized and we're |
342 | 4572 // ready to restart. |
4573 } | |
4574 | |
4575 if (_cm->verbose_low()) { | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4576 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
342 | 4577 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4578 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4579 if (_cm->has_aborted()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4580 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
|
4581 _worker_id); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
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|
4582 } |
342 | 4583 } |
4584 } else { | |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
4585 if (_cm->verbose_low()) { |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4586 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
342 | 4587 "elapsed = %1.2lfms <<<<<<<<<<", |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4588 _worker_id, _time_target_ms, elapsed_time_ms); |
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
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|
4589 } |
342 | 4590 } |
4591 | |
4592 _claimed = false; | |
4593 } | |
4594 | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4595 CMTask::CMTask(uint worker_id, |
342 | 4596 ConcurrentMark* cm, |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4597 size_t* marked_bytes, |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4598 BitMap* card_bm, |
342 | 4599 CMTaskQueue* task_queue, |
4600 CMTaskQueueSet* task_queues) | |
4601 : _g1h(G1CollectedHeap::heap()), | |
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4602 _worker_id(worker_id), _cm(cm), |
342 | 4603 _claimed(false), |
4604 _nextMarkBitMap(NULL), _hash_seed(17), | |
4605 _task_queue(task_queue), | |
4606 _task_queues(task_queues), | |
3771 | 4607 _cm_oop_closure(NULL), |
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4608 _marked_bytes_array(marked_bytes), |
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4609 _card_bm(card_bm) { |
1023
11d4857fe5e1
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tonyp
parents:
1022
diff
changeset
|
4610 guarantee(task_queue != NULL, "invariant"); |
11d4857fe5e1
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parents:
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diff
changeset
|
4611 guarantee(task_queues != NULL, "invariant"); |
342 | 4612 |
4613 statsOnly( _clock_due_to_scanning = 0; | |
4614 _clock_due_to_marking = 0 ); | |
4615 | |
4616 _marking_step_diffs_ms.add(0.5); | |
4617 } | |
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4618 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4619 // 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
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2369
diff
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|
4620 // 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
|
4621 // 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
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2369
diff
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|
4622 // with the corresponding macro. Also note that most of the macros add |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4623 // the necessary white space (as a prefix) which makes them a bit |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4624 // easier to compose. |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
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changeset
|
4625 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4626 // 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
|
4627 // 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
|
4628 #define G1PPRL_LINE_PREFIX "###" |
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
|
4629 |
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
|
4630 #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
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2369
diff
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|
4631 #ifdef _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4632 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
371bbc844bf1
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tonyp
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diff
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|
4633 #else // _LP64 |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
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|
4634 #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
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|
4635 #endif // _LP64 |
371bbc844bf1
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|
4636 |
371bbc844bf1
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|
4637 // For per-region info |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
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|
4638 #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
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|
4639 #define G1PPRL_TYPE_H_FORMAT " %4s" |
371bbc844bf1
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tonyp
parents:
2369
diff
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|
4640 #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
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diff
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|
4641 #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
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|
4642 #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
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|
4643 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4644 |
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changeset
|
4645 // For summary info |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4646 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
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|
4647 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
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|
4648 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
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|
4649 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
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|
4650 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4651 G1PrintRegionLivenessInfoClosure:: |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4652 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4653 : _out(out), |
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|
4654 _total_used_bytes(0), _total_capacity_bytes(0), |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4655 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
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|
4656 _hum_used_bytes(0), _hum_capacity_bytes(0), |
10290
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|
4657 _hum_prev_live_bytes(0), _hum_next_live_bytes(0), |
12080 | 4658 _total_remset_bytes(0), _total_strong_code_roots_bytes(0) { |
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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|
4659 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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|
4660 MemRegion g1_reserved = g1h->g1_reserved(); |
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|
4661 double now = os::elapsedTime(); |
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|
4662 |
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|
4663 // Print the header of the output. |
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|
4664 _out->cr(); |
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|
4665 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
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|
4666 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
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|
4667 G1PPRL_SUM_ADDR_FORMAT("reserved") |
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|
4668 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4669 p2i(g1_reserved.start()), p2i(g1_reserved.end()), |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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3979
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changeset
|
4670 HeapRegion::GrainBytes); |
2435
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|
4671 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4672 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
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|
4673 G1PPRL_TYPE_H_FORMAT |
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|
4674 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4675 G1PPRL_BYTE_H_FORMAT |
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|
4676 G1PPRL_BYTE_H_FORMAT |
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|
4677 G1PPRL_BYTE_H_FORMAT |
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|
4678 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4679 G1PPRL_BYTE_H_FORMAT |
10290
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|
4680 G1PPRL_BYTE_H_FORMAT, |
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|
4681 "type", "address-range", |
12080 | 4682 "used", "prev-live", "next-live", "gc-eff", |
4683 "remset", "code-roots"); | |
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4684 _out->print_cr(G1PPRL_LINE_PREFIX |
10290
05a17f270c7e
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|
4685 G1PPRL_TYPE_H_FORMAT |
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|
4686 G1PPRL_ADDR_BASE_H_FORMAT |
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|
4687 G1PPRL_BYTE_H_FORMAT |
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|
4688 G1PPRL_BYTE_H_FORMAT |
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|
4689 G1PPRL_BYTE_H_FORMAT |
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|
4690 G1PPRL_DOUBLE_H_FORMAT |
12080 | 4691 G1PPRL_BYTE_H_FORMAT |
10290
05a17f270c7e
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|
4692 G1PPRL_BYTE_H_FORMAT, |
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|
4693 "", "", |
12080 | 4694 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)", |
4695 "(bytes)", "(bytes)"); | |
2435
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|
4696 } |
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changeset
|
4697 |
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|
4698 // It takes as a parameter a reference to one of the _hum_* fields, it |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4699 // deduces the corresponding value for a region in a humongous region |
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|
4700 // series (either the region size, or what's left if the _hum_* field |
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|
4701 // is < the region size), and updates the _hum_* field accordingly. |
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|
4702 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
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|
4703 size_t bytes = 0; |
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|
4704 // The > 0 check is to deal with the prev and next live bytes which |
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|
4705 // could be 0. |
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changeset
|
4706 if (*hum_bytes > 0) { |
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4707 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
2435
371bbc844bf1
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|
4708 *hum_bytes -= bytes; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4709 } |
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diff
changeset
|
4710 return bytes; |
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diff
changeset
|
4711 } |
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diff
changeset
|
4712 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4713 // It deduces the values for a region in a humongous region series |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4714 // 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
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diff
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|
4715 // that that _hum_* fields have already been set up from the "starts |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4716 // humongous" region and we visit the regions in address order. |
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changeset
|
4717 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
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|
4718 size_t* capacity_bytes, |
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|
4719 size_t* prev_live_bytes, |
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diff
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|
4720 size_t* next_live_bytes) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4721 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4722 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
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|
4723 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4724 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
4725 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
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|
4726 } |
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diff
changeset
|
4727 |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4728 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
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|
4729 const char* type = ""; |
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4730 HeapWord* bottom = r->bottom(); |
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|
4731 HeapWord* end = r->end(); |
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|
4732 size_t capacity_bytes = r->capacity(); |
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|
4733 size_t used_bytes = r->used(); |
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|
4734 size_t prev_live_bytes = r->live_bytes(); |
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|
4735 size_t next_live_bytes = r->next_live_bytes(); |
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|
4736 double gc_eff = r->gc_efficiency(); |
10290
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|
4737 size_t remset_bytes = r->rem_set()->mem_size(); |
12080 | 4738 size_t strong_code_roots_bytes = r->rem_set()->strong_code_roots_mem_size(); |
4739 | |
2435
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|
4740 if (r->used() == 0) { |
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diff
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|
4741 type = "FREE"; |
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|
4742 } else if (r->is_survivor()) { |
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diff
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|
4743 type = "SURV"; |
371bbc844bf1
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diff
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|
4744 } else if (r->is_young()) { |
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diff
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|
4745 type = "EDEN"; |
371bbc844bf1
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diff
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|
4746 } else if (r->startsHumongous()) { |
371bbc844bf1
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diff
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|
4747 type = "HUMS"; |
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diff
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|
4748 |
371bbc844bf1
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diff
changeset
|
4749 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
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|
4750 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
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|
4751 "they should have been zeroed after the last time we used them"); |
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|
4752 // Set up the _hum_* fields. |
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|
4753 _hum_capacity_bytes = capacity_bytes; |
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|
4754 _hum_used_bytes = used_bytes; |
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|
4755 _hum_prev_live_bytes = prev_live_bytes; |
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|
4756 _hum_next_live_bytes = next_live_bytes; |
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|
4757 get_hum_bytes(&used_bytes, &capacity_bytes, |
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diff
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|
4758 &prev_live_bytes, &next_live_bytes); |
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diff
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|
4759 end = bottom + HeapRegion::GrainWords; |
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diff
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|
4760 } else if (r->continuesHumongous()) { |
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diff
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|
4761 type = "HUMC"; |
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diff
changeset
|
4762 get_hum_bytes(&used_bytes, &capacity_bytes, |
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4763 &prev_live_bytes, &next_live_bytes); |
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4764 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
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|
4765 } else { |
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|
4766 type = "OLD"; |
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|
4767 } |
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|
4768 |
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4769 _total_used_bytes += used_bytes; |
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4770 _total_capacity_bytes += capacity_bytes; |
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4771 _total_prev_live_bytes += prev_live_bytes; |
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4772 _total_next_live_bytes += next_live_bytes; |
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05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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4773 _total_remset_bytes += remset_bytes; |
12080 | 4774 _total_strong_code_roots_bytes += strong_code_roots_bytes; |
2435
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4775 |
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4776 // Print a line for this particular region. |
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4777 _out->print_cr(G1PPRL_LINE_PREFIX |
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|
4778 G1PPRL_TYPE_FORMAT |
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diff
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|
4779 G1PPRL_ADDR_BASE_FORMAT |
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|
4780 G1PPRL_BYTE_FORMAT |
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|
4781 G1PPRL_BYTE_FORMAT |
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|
4782 G1PPRL_BYTE_FORMAT |
10290
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4783 G1PPRL_DOUBLE_FORMAT |
12080 | 4784 G1PPRL_BYTE_FORMAT |
10290
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|
4785 G1PPRL_BYTE_FORMAT, |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
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parents:
17844
diff
changeset
|
4786 type, p2i(bottom), p2i(end), |
12080 | 4787 used_bytes, prev_live_bytes, next_live_bytes, gc_eff, |
4788 remset_bytes, strong_code_roots_bytes); | |
2435
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|
4789 |
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|
4790 return false; |
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diff
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|
4791 } |
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|
4792 |
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|
4793 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
10290
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|
4794 // add static memory usages to remembered set sizes |
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4795 _total_remset_bytes += HeapRegionRemSet::fl_mem_size() + HeapRegionRemSet::static_mem_size(); |
2435
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|
4796 // Print the footer of the output. |
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diff
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|
4797 _out->print_cr(G1PPRL_LINE_PREFIX); |
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|
4798 _out->print_cr(G1PPRL_LINE_PREFIX |
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diff
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|
4799 " SUMMARY" |
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diff
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|
4800 G1PPRL_SUM_MB_FORMAT("capacity") |
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|
4801 G1PPRL_SUM_MB_PERC_FORMAT("used") |
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|
4802 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
10290
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|
4803 G1PPRL_SUM_MB_PERC_FORMAT("next-live") |
12080 | 4804 G1PPRL_SUM_MB_FORMAT("remset") |
4805 G1PPRL_SUM_MB_FORMAT("code-roots"), | |
2435
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diff
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|
4806 bytes_to_mb(_total_capacity_bytes), |
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|
4807 bytes_to_mb(_total_used_bytes), |
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diff
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|
4808 perc(_total_used_bytes, _total_capacity_bytes), |
371bbc844bf1
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diff
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|
4809 bytes_to_mb(_total_prev_live_bytes), |
371bbc844bf1
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diff
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|
4810 perc(_total_prev_live_bytes, _total_capacity_bytes), |
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diff
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|
4811 bytes_to_mb(_total_next_live_bytes), |
10290
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8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4812 perc(_total_next_live_bytes, _total_capacity_bytes), |
12080 | 4813 bytes_to_mb(_total_remset_bytes), |
4814 bytes_to_mb(_total_strong_code_roots_bytes)); | |
2435
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diff
changeset
|
4815 _out->cr(); |
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diff
changeset
|
4816 } |